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mm/shmem.c
111 KB
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/* * Resizable virtual memory filesystem for Linux. * * Copyright (C) 2000 Linus Torvalds. * 2000 Transmeta Corp. * 2000-2001 Christoph Rohland * 2000-2001 SAP AG * 2002 Red Hat Inc. |
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* Copyright (C) 2002-2011 Hugh Dickins. * Copyright (C) 2011 Google Inc. |
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* Copyright (C) 2002-2005 VERITAS Software Corporation. |
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* Copyright (C) 2004 Andi Kleen, SuSE Labs * * Extended attribute support for tmpfs: * Copyright (c) 2004, Luke Kenneth Casson Leighton <lkcl@lkcl.net> * Copyright (c) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com> * |
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* tiny-shmem: * Copyright (c) 2004, 2008 Matt Mackall <mpm@selenic.com> * |
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* This file is released under the GPL. */ |
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#include <linux/fs.h> #include <linux/init.h> #include <linux/vfs.h> #include <linux/mount.h> |
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#include <linux/ramfs.h> |
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#include <linux/pagemap.h> |
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#include <linux/file.h> #include <linux/mm.h> |
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#include <linux/random.h> |
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#include <linux/sched/signal.h> |
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#include <linux/export.h> |
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#include <linux/swap.h> |
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#include <linux/uio.h> |
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#include <linux/khugepaged.h> |
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#include <linux/hugetlb.h> |
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#include <linux/frontswap.h> |
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#include <linux/fs_parser.h> |
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#include <asm/tlbflush.h> /* for arch/microblaze update_mmu_cache() */ |
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static struct vfsmount *shm_mnt; #ifdef CONFIG_SHMEM |
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/* * This virtual memory filesystem is heavily based on the ramfs. It * extends ramfs by the ability to use swap and honor resource limits * which makes it a completely usable filesystem. */ |
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#include <linux/xattr.h> |
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#include <linux/exportfs.h> |
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#include <linux/posix_acl.h> |
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#include <linux/posix_acl_xattr.h> |
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#include <linux/mman.h> |
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#include <linux/string.h> #include <linux/slab.h> #include <linux/backing-dev.h> #include <linux/shmem_fs.h> |
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#include <linux/writeback.h> |
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#include <linux/blkdev.h> |
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#include <linux/pagevec.h> |
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#include <linux/percpu_counter.h> |
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#include <linux/falloc.h> |
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#include <linux/splice.h> |
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#include <linux/security.h> #include <linux/swapops.h> #include <linux/mempolicy.h> #include <linux/namei.h> |
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#include <linux/ctype.h> |
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#include <linux/migrate.h> |
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#include <linux/highmem.h> |
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#include <linux/seq_file.h> |
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#include <linux/magic.h> |
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#include <linux/syscalls.h> |
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#include <linux/fcntl.h> |
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#include <uapi/linux/memfd.h> |
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#include <linux/userfaultfd_k.h> |
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#include <linux/rmap.h> |
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#include <linux/uuid.h> |
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|
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#include <linux/uaccess.h> |
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#include "internal.h" |
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#define BLOCKS_PER_PAGE (PAGE_SIZE/512) #define VM_ACCT(size) (PAGE_ALIGN(size) >> PAGE_SHIFT) |
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/* Pretend that each entry is of this size in directory's i_size */ #define BOGO_DIRENT_SIZE 20 |
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/* Symlink up to this size is kmalloc'ed instead of using a swappable page */ #define SHORT_SYMLINK_LEN 128 |
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/* |
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* shmem_fallocate communicates with shmem_fault or shmem_writepage via * inode->i_private (with i_mutex making sure that it has only one user at * a time): we would prefer not to enlarge the shmem inode just for that. |
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*/ struct shmem_falloc { |
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wait_queue_head_t *waitq; /* faults into hole wait for punch to end */ |
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pgoff_t start; /* start of range currently being fallocated */ pgoff_t next; /* the next page offset to be fallocated */ pgoff_t nr_falloced; /* how many new pages have been fallocated */ pgoff_t nr_unswapped; /* how often writepage refused to swap out */ }; |
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struct shmem_options { unsigned long long blocks; unsigned long long inodes; struct mempolicy *mpol; kuid_t uid; kgid_t gid; umode_t mode; |
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bool full_inums; |
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int huge; int seen; #define SHMEM_SEEN_BLOCKS 1 #define SHMEM_SEEN_INODES 2 #define SHMEM_SEEN_HUGE 4 |
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#define SHMEM_SEEN_INUMS 8 |
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}; |
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#ifdef CONFIG_TMPFS |
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static unsigned long shmem_default_max_blocks(void) { |
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return totalram_pages() / 2; |
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} static unsigned long shmem_default_max_inodes(void) { |
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unsigned long nr_pages = totalram_pages(); return min(nr_pages - totalhigh_pages(), nr_pages / 2); |
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} |
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#endif |
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static bool shmem_should_replace_page(struct page *page, gfp_t gfp); static int shmem_replace_page(struct page **pagep, gfp_t gfp, struct shmem_inode_info *info, pgoff_t index); |
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static int shmem_swapin_page(struct inode *inode, pgoff_t index, struct page **pagep, enum sgp_type sgp, gfp_t gfp, struct vm_area_struct *vma, vm_fault_t *fault_type); |
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static int shmem_getpage_gfp(struct inode *inode, pgoff_t index, |
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struct page **pagep, enum sgp_type sgp, |
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gfp_t gfp, struct vm_area_struct *vma, |
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struct vm_fault *vmf, vm_fault_t *fault_type); |
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int shmem_getpage(struct inode *inode, pgoff_t index, |
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struct page **pagep, enum sgp_type sgp) |
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{ return shmem_getpage_gfp(inode, index, pagep, sgp, |
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mapping_gfp_mask(inode->i_mapping), NULL, NULL, NULL); |
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} |
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static inline struct shmem_sb_info *SHMEM_SB(struct super_block *sb) { return sb->s_fs_info; } /* * shmem_file_setup pre-accounts the whole fixed size of a VM object, * for shared memory and for shared anonymous (/dev/zero) mappings * (unless MAP_NORESERVE and sysctl_overcommit_memory <= 1), * consistent with the pre-accounting of private mappings ... */ static inline int shmem_acct_size(unsigned long flags, loff_t size) { |
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return (flags & VM_NORESERVE) ? |
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0 : security_vm_enough_memory_mm(current->mm, VM_ACCT(size)); |
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} static inline void shmem_unacct_size(unsigned long flags, loff_t size) { |
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if (!(flags & VM_NORESERVE)) |
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vm_unacct_memory(VM_ACCT(size)); } |
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static inline int shmem_reacct_size(unsigned long flags, loff_t oldsize, loff_t newsize) { if (!(flags & VM_NORESERVE)) { if (VM_ACCT(newsize) > VM_ACCT(oldsize)) return security_vm_enough_memory_mm(current->mm, VM_ACCT(newsize) - VM_ACCT(oldsize)); else if (VM_ACCT(newsize) < VM_ACCT(oldsize)) vm_unacct_memory(VM_ACCT(oldsize) - VM_ACCT(newsize)); } return 0; } |
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/* * ... whereas tmpfs objects are accounted incrementally as |
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* pages are allocated, in order to allow large sparse files. |
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* shmem_getpage reports shmem_acct_block failure as -ENOSPC not -ENOMEM, * so that a failure on a sparse tmpfs mapping will give SIGBUS not OOM. */ |
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static inline int shmem_acct_block(unsigned long flags, long pages) |
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{ |
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if (!(flags & VM_NORESERVE)) return 0; return security_vm_enough_memory_mm(current->mm, pages * VM_ACCT(PAGE_SIZE)); |
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} static inline void shmem_unacct_blocks(unsigned long flags, long pages) { |
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if (flags & VM_NORESERVE) |
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vm_unacct_memory(pages * VM_ACCT(PAGE_SIZE)); |
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} |
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static inline bool shmem_inode_acct_block(struct inode *inode, long pages) { struct shmem_inode_info *info = SHMEM_I(inode); struct shmem_sb_info *sbinfo = SHMEM_SB(inode->i_sb); if (shmem_acct_block(info->flags, pages)) return false; if (sbinfo->max_blocks) { if (percpu_counter_compare(&sbinfo->used_blocks, sbinfo->max_blocks - pages) > 0) goto unacct; percpu_counter_add(&sbinfo->used_blocks, pages); } return true; unacct: shmem_unacct_blocks(info->flags, pages); return false; } static inline void shmem_inode_unacct_blocks(struct inode *inode, long pages) { struct shmem_inode_info *info = SHMEM_I(inode); struct shmem_sb_info *sbinfo = SHMEM_SB(inode->i_sb); if (sbinfo->max_blocks) percpu_counter_sub(&sbinfo->used_blocks, pages); shmem_unacct_blocks(info->flags, pages); } |
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static const struct super_operations shmem_ops; |
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static const struct address_space_operations shmem_aops; |
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static const struct file_operations shmem_file_operations; |
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static const struct inode_operations shmem_inode_operations; static const struct inode_operations shmem_dir_inode_operations; static const struct inode_operations shmem_special_inode_operations; |
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static const struct vm_operations_struct shmem_vm_ops; |
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static struct file_system_type shmem_fs_type; |
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bool vma_is_shmem(struct vm_area_struct *vma) { return vma->vm_ops == &shmem_vm_ops; } |
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static LIST_HEAD(shmem_swaplist); |
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static DEFINE_MUTEX(shmem_swaplist_mutex); |
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/* * shmem_reserve_inode() performs bookkeeping to reserve a shmem inode, and * produces a novel ino for the newly allocated inode. * * It may also be called when making a hard link to permit the space needed by * each dentry. However, in that case, no new inode number is needed since that * internally draws from another pool of inode numbers (currently global * get_next_ino()). This case is indicated by passing NULL as inop. */ #define SHMEM_INO_BATCH 1024 static int shmem_reserve_inode(struct super_block *sb, ino_t *inop) |
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{ struct shmem_sb_info *sbinfo = SHMEM_SB(sb); |
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ino_t ino; if (!(sb->s_flags & SB_KERNMOUNT)) { |
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spin_lock(&sbinfo->stat_lock); |
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if (sbinfo->max_inodes) { if (!sbinfo->free_inodes) { spin_unlock(&sbinfo->stat_lock); return -ENOSPC; } sbinfo->free_inodes--; |
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} |
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if (inop) { ino = sbinfo->next_ino++; if (unlikely(is_zero_ino(ino))) ino = sbinfo->next_ino++; |
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if (unlikely(!sbinfo->full_inums && ino > UINT_MAX)) { |
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/* * Emulate get_next_ino uint wraparound for * compatibility */ |
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if (IS_ENABLED(CONFIG_64BIT)) pr_warn("%s: inode number overflow on device %d, consider using inode64 mount option ", __func__, MINOR(sb->s_dev)); sbinfo->next_ino = 1; ino = sbinfo->next_ino++; |
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} *inop = ino; } |
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spin_unlock(&sbinfo->stat_lock); |
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} else if (inop) { /* * __shmem_file_setup, one of our callers, is lock-free: it * doesn't hold stat_lock in shmem_reserve_inode since * max_inodes is always 0, and is called from potentially * unknown contexts. As such, use a per-cpu batched allocator * which doesn't require the per-sb stat_lock unless we are at * the batch boundary. |
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* * We don't need to worry about inode{32,64} since SB_KERNMOUNT * shmem mounts are not exposed to userspace, so we don't need * to worry about things like glibc compatibility. |
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*/ ino_t *next_ino; next_ino = per_cpu_ptr(sbinfo->ino_batch, get_cpu()); ino = *next_ino; if (unlikely(ino % SHMEM_INO_BATCH == 0)) { spin_lock(&sbinfo->stat_lock); ino = sbinfo->next_ino; sbinfo->next_ino += SHMEM_INO_BATCH; spin_unlock(&sbinfo->stat_lock); if (unlikely(is_zero_ino(ino))) ino++; } *inop = ino; *next_ino = ++ino; put_cpu(); |
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} |
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return 0; } static void shmem_free_inode(struct super_block *sb) { struct shmem_sb_info *sbinfo = SHMEM_SB(sb); if (sbinfo->max_inodes) { spin_lock(&sbinfo->stat_lock); sbinfo->free_inodes++; spin_unlock(&sbinfo->stat_lock); } } |
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/** |
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* shmem_recalc_inode - recalculate the block usage of an inode |
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* @inode: inode to recalc * * We have to calculate the free blocks since the mm can drop * undirtied hole pages behind our back. * * But normally info->alloced == inode->i_mapping->nrpages + info->swapped * So mm freed is info->alloced - (inode->i_mapping->nrpages + info->swapped) * * It has to be called with the spinlock held. */ static void shmem_recalc_inode(struct inode *inode) { struct shmem_inode_info *info = SHMEM_I(inode); long freed; freed = info->alloced - info->swapped - inode->i_mapping->nrpages; if (freed > 0) { info->alloced -= freed; |
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inode->i_blocks -= freed * BLOCKS_PER_PAGE; |
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shmem_inode_unacct_blocks(inode, freed); |
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} } |
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bool shmem_charge(struct inode *inode, long pages) { struct shmem_inode_info *info = SHMEM_I(inode); |
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unsigned long flags; |
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|
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if (!shmem_inode_acct_block(inode, pages)) |
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return false; |
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/* nrpages adjustment first, then shmem_recalc_inode() when balanced */ inode->i_mapping->nrpages += pages; |
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spin_lock_irqsave(&info->lock, flags); |
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info->alloced += pages; inode->i_blocks += pages * BLOCKS_PER_PAGE; shmem_recalc_inode(inode); |
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spin_unlock_irqrestore(&info->lock, flags); |
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return true; } void shmem_uncharge(struct inode *inode, long pages) { struct shmem_inode_info *info = SHMEM_I(inode); |
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unsigned long flags; |
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/* nrpages adjustment done by __delete_from_page_cache() or caller */ |
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spin_lock_irqsave(&info->lock, flags); |
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info->alloced -= pages; inode->i_blocks -= pages * BLOCKS_PER_PAGE; shmem_recalc_inode(inode); |
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spin_unlock_irqrestore(&info->lock, flags); |
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shmem_inode_unacct_blocks(inode, pages); |
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} |
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/* |
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* Replace item expected in xarray by a new item, while holding xa_lock. |
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*/ |
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static int shmem_replace_entry(struct address_space *mapping, |
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pgoff_t index, void *expected, void *replacement) { |
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XA_STATE(xas, &mapping->i_pages, index); |
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void *item; |
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VM_BUG_ON(!expected); |
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VM_BUG_ON(!replacement); |
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item = xas_load(&xas); |
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if (item != expected) return -ENOENT; |
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xas_store(&xas, replacement); |
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return 0; } /* |
d18992286 shmem: fix negati... |
413 414 415 416 417 418 419 420 421 |
* Sometimes, before we decide whether to proceed or to fail, we must check * that an entry was not already brought back from swap by a racing thread. * * Checking page is not enough: by the time a SwapCache page is locked, it * might be reused, and again be SwapCache, using the same swap as before. */ static bool shmem_confirm_swap(struct address_space *mapping, pgoff_t index, swp_entry_t swap) { |
a12831bf4 shmem: Convert sh... |
422 |
return xa_load(&mapping->i_pages, index) == swp_to_radix_entry(swap); |
d18992286 shmem: fix negati... |
423 424 425 |
} /* |
5a6e75f81 shmem: prepare hu... |
426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 |
* Definitions for "huge tmpfs": tmpfs mounted with the huge= option * * SHMEM_HUGE_NEVER: * disables huge pages for the mount; * SHMEM_HUGE_ALWAYS: * enables huge pages for the mount; * SHMEM_HUGE_WITHIN_SIZE: * only allocate huge pages if the page will be fully within i_size, * also respect fadvise()/madvise() hints; * SHMEM_HUGE_ADVISE: * only allocate huge pages if requested with fadvise()/madvise(); */ #define SHMEM_HUGE_NEVER 0 #define SHMEM_HUGE_ALWAYS 1 #define SHMEM_HUGE_WITHIN_SIZE 2 #define SHMEM_HUGE_ADVISE 3 /* * Special values. * Only can be set via /sys/kernel/mm/transparent_hugepage/shmem_enabled: * * SHMEM_HUGE_DENY: * disables huge on shm_mnt and all mounts, for emergency use; * SHMEM_HUGE_FORCE: * enables huge on shm_mnt and all mounts, w/o needing option, for testing; * */ #define SHMEM_HUGE_DENY (-1) #define SHMEM_HUGE_FORCE (-2) |
396bcc529 mm: remove CONFIG... |
456 |
#ifdef CONFIG_TRANSPARENT_HUGEPAGE |
5a6e75f81 shmem: prepare hu... |
457 |
/* ifdef here to avoid bloating shmem.o when not necessary */ |
5b9c98f30 mm/shmem: add __r... |
458 |
static int shmem_huge __read_mostly; |
5a6e75f81 shmem: prepare hu... |
459 |
|
e5f2249ab mm/shmem.c: fix u... |
460 |
#if defined(CONFIG_SYSFS) |
5a6e75f81 shmem: prepare hu... |
461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 |
static int shmem_parse_huge(const char *str) { if (!strcmp(str, "never")) return SHMEM_HUGE_NEVER; if (!strcmp(str, "always")) return SHMEM_HUGE_ALWAYS; if (!strcmp(str, "within_size")) return SHMEM_HUGE_WITHIN_SIZE; if (!strcmp(str, "advise")) return SHMEM_HUGE_ADVISE; if (!strcmp(str, "deny")) return SHMEM_HUGE_DENY; if (!strcmp(str, "force")) return SHMEM_HUGE_FORCE; return -EINVAL; } |
e5f2249ab mm/shmem.c: fix u... |
477 |
#endif |
5a6e75f81 shmem: prepare hu... |
478 |
|
e5f2249ab mm/shmem.c: fix u... |
479 |
#if defined(CONFIG_SYSFS) || defined(CONFIG_TMPFS) |
5a6e75f81 shmem: prepare hu... |
480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 |
static const char *shmem_format_huge(int huge) { switch (huge) { case SHMEM_HUGE_NEVER: return "never"; case SHMEM_HUGE_ALWAYS: return "always"; case SHMEM_HUGE_WITHIN_SIZE: return "within_size"; case SHMEM_HUGE_ADVISE: return "advise"; case SHMEM_HUGE_DENY: return "deny"; case SHMEM_HUGE_FORCE: return "force"; default: VM_BUG_ON(1); return "bad_val"; } } |
f1f5929cd shmem: fix compil... |
500 |
#endif |
5a6e75f81 shmem: prepare hu... |
501 |
|
779750d20 shmem: split huge... |
502 503 504 505 |
static unsigned long shmem_unused_huge_shrink(struct shmem_sb_info *sbinfo, struct shrink_control *sc, unsigned long nr_to_split) { LIST_HEAD(list), *pos, *next; |
253fd0f02 shmem: fix sleepi... |
506 |
LIST_HEAD(to_remove); |
779750d20 shmem: split huge... |
507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 |
struct inode *inode; struct shmem_inode_info *info; struct page *page; unsigned long batch = sc ? sc->nr_to_scan : 128; int removed = 0, split = 0; if (list_empty(&sbinfo->shrinklist)) return SHRINK_STOP; spin_lock(&sbinfo->shrinklist_lock); list_for_each_safe(pos, next, &sbinfo->shrinklist) { info = list_entry(pos, struct shmem_inode_info, shrinklist); /* pin the inode */ inode = igrab(&info->vfs_inode); /* inode is about to be evicted */ if (!inode) { list_del_init(&info->shrinklist); removed++; goto next; } /* Check if there's anything to gain */ if (round_up(inode->i_size, PAGE_SIZE) == round_up(inode->i_size, HPAGE_PMD_SIZE)) { |
253fd0f02 shmem: fix sleepi... |
533 |
list_move(&info->shrinklist, &to_remove); |
779750d20 shmem: split huge... |
534 |
removed++; |
779750d20 shmem: split huge... |
535 536 537 538 539 540 541 542 543 |
goto next; } list_move(&info->shrinklist, &list); next: if (!--batch) break; } spin_unlock(&sbinfo->shrinklist_lock); |
253fd0f02 shmem: fix sleepi... |
544 545 546 547 548 549 |
list_for_each_safe(pos, next, &to_remove) { info = list_entry(pos, struct shmem_inode_info, shrinklist); inode = &info->vfs_inode; list_del_init(&info->shrinklist); iput(inode); } |
779750d20 shmem: split huge... |
550 551 552 553 554 |
list_for_each_safe(pos, next, &list) { int ret; info = list_entry(pos, struct shmem_inode_info, shrinklist); inode = &info->vfs_inode; |
b3cd54b25 mm/shmem: do not ... |
555 556 |
if (nr_to_split && split >= nr_to_split) goto leave; |
779750d20 shmem: split huge... |
557 |
|
b3cd54b25 mm/shmem: do not ... |
558 |
page = find_get_page(inode->i_mapping, |
779750d20 shmem: split huge... |
559 560 561 |
(inode->i_size & HPAGE_PMD_MASK) >> PAGE_SHIFT); if (!page) goto drop; |
b3cd54b25 mm/shmem: do not ... |
562 |
/* No huge page at the end of the file: nothing to split */ |
779750d20 shmem: split huge... |
563 |
if (!PageTransHuge(page)) { |
779750d20 shmem: split huge... |
564 565 566 |
put_page(page); goto drop; } |
b3cd54b25 mm/shmem: do not ... |
567 568 569 570 571 572 573 574 575 576 577 |
/* * Leave the inode on the list if we failed to lock * the page at this time. * * Waiting for the lock may lead to deadlock in the * reclaim path. */ if (!trylock_page(page)) { put_page(page); goto leave; } |
779750d20 shmem: split huge... |
578 579 580 |
ret = split_huge_page(page); unlock_page(page); put_page(page); |
b3cd54b25 mm/shmem: do not ... |
581 582 583 |
/* If split failed leave the inode on the list */ if (ret) goto leave; |
779750d20 shmem: split huge... |
584 585 586 587 588 |
split++; drop: list_del_init(&info->shrinklist); removed++; |
b3cd54b25 mm/shmem: do not ... |
589 |
leave: |
779750d20 shmem: split huge... |
590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 |
iput(inode); } spin_lock(&sbinfo->shrinklist_lock); list_splice_tail(&list, &sbinfo->shrinklist); sbinfo->shrinklist_len -= removed; spin_unlock(&sbinfo->shrinklist_lock); return split; } static long shmem_unused_huge_scan(struct super_block *sb, struct shrink_control *sc) { struct shmem_sb_info *sbinfo = SHMEM_SB(sb); if (!READ_ONCE(sbinfo->shrinklist_len)) return SHRINK_STOP; return shmem_unused_huge_shrink(sbinfo, sc, 0); } static long shmem_unused_huge_count(struct super_block *sb, struct shrink_control *sc) { struct shmem_sb_info *sbinfo = SHMEM_SB(sb); return READ_ONCE(sbinfo->shrinklist_len); } |
396bcc529 mm: remove CONFIG... |
618 |
#else /* !CONFIG_TRANSPARENT_HUGEPAGE */ |
5a6e75f81 shmem: prepare hu... |
619 620 |
#define shmem_huge SHMEM_HUGE_DENY |
779750d20 shmem: split huge... |
621 622 623 624 625 |
static unsigned long shmem_unused_huge_shrink(struct shmem_sb_info *sbinfo, struct shrink_control *sc, unsigned long nr_to_split) { return 0; } |
396bcc529 mm: remove CONFIG... |
626 |
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
5a6e75f81 shmem: prepare hu... |
627 |
|
89fdcd262 mm: shmem: make s... |
628 629 |
static inline bool is_huge_enabled(struct shmem_sb_info *sbinfo) { |
396bcc529 mm: remove CONFIG... |
630 |
if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE) && |
89fdcd262 mm: shmem: make s... |
631 632 633 634 635 |
(shmem_huge == SHMEM_HUGE_FORCE || sbinfo->huge) && shmem_huge != SHMEM_HUGE_DENY) return true; return false; } |
5a6e75f81 shmem: prepare hu... |
636 |
/* |
46f65ec15 tmpfs: convert sh... |
637 638 639 640 |
* Like add_to_page_cache_locked, but error if expected item has gone. */ static int shmem_add_to_page_cache(struct page *page, struct address_space *mapping, |
3fea5a499 mm: memcontrol: c... |
641 642 |
pgoff_t index, void *expected, gfp_t gfp, struct mm_struct *charge_mm) |
46f65ec15 tmpfs: convert sh... |
643 |
{ |
552446a41 shmem: Convert sh... |
644 645 |
XA_STATE_ORDER(xas, &mapping->i_pages, index, compound_order(page)); unsigned long i = 0; |
d8c6546b1 mm: introduce com... |
646 |
unsigned long nr = compound_nr(page); |
3fea5a499 mm: memcontrol: c... |
647 |
int error; |
46f65ec15 tmpfs: convert sh... |
648 |
|
800d8c63b shmem: add huge p... |
649 650 |
VM_BUG_ON_PAGE(PageTail(page), page); VM_BUG_ON_PAGE(index != round_down(index, nr), page); |
309381fea mm: dump page whe... |
651 652 |
VM_BUG_ON_PAGE(!PageLocked(page), page); VM_BUG_ON_PAGE(!PageSwapBacked(page), page); |
800d8c63b shmem: add huge p... |
653 |
VM_BUG_ON(expected && PageTransHuge(page)); |
46f65ec15 tmpfs: convert sh... |
654 |
|
800d8c63b shmem: add huge p... |
655 |
page_ref_add(page, nr); |
b065b4321 shmem: cleanup sh... |
656 657 |
page->mapping = mapping; page->index = index; |
4c6355b25 mm: memcontrol: c... |
658 |
if (!PageSwapCache(page)) { |
d9eb1ea2b mm: memcontrol: d... |
659 |
error = mem_cgroup_charge(page, charge_mm, gfp); |
4c6355b25 mm: memcontrol: c... |
660 661 662 663 664 665 |
if (error) { if (PageTransHuge(page)) { count_vm_event(THP_FILE_FALLBACK); count_vm_event(THP_FILE_FALLBACK_CHARGE); } goto error; |
3fea5a499 mm: memcontrol: c... |
666 |
} |
3fea5a499 mm: memcontrol: c... |
667 668 |
} cgroup_throttle_swaprate(page, gfp); |
552446a41 shmem: Convert sh... |
669 670 671 672 673 674 675 676 677 678 |
do { void *entry; xas_lock_irq(&xas); entry = xas_find_conflict(&xas); if (entry != expected) xas_set_err(&xas, -EEXIST); xas_create_range(&xas); if (xas_error(&xas)) goto unlock; next: |
4101196b1 mm: page cache: s... |
679 |
xas_store(&xas, page); |
552446a41 shmem: Convert sh... |
680 681 682 |
if (++i < nr) { xas_next(&xas); goto next; |
800d8c63b shmem: add huge p... |
683 |
} |
552446a41 shmem: Convert sh... |
684 |
if (PageTransHuge(page)) { |
800d8c63b shmem: add huge p... |
685 |
count_vm_event(THP_FILE_ALLOC); |
552446a41 shmem: Convert sh... |
686 |
__inc_node_page_state(page, NR_SHMEM_THPS); |
800d8c63b shmem: add huge p... |
687 |
} |
800d8c63b shmem: add huge p... |
688 |
mapping->nrpages += nr; |
0d1c20722 mm: memcontrol: s... |
689 690 |
__mod_lruvec_page_state(page, NR_FILE_PAGES, nr); __mod_lruvec_page_state(page, NR_SHMEM, nr); |
552446a41 shmem: Convert sh... |
691 692 693 694 695 |
unlock: xas_unlock_irq(&xas); } while (xas_nomem(&xas, gfp)); if (xas_error(&xas)) { |
3fea5a499 mm: memcontrol: c... |
696 697 |
error = xas_error(&xas); goto error; |
46f65ec15 tmpfs: convert sh... |
698 |
} |
552446a41 shmem: Convert sh... |
699 700 |
return 0; |
3fea5a499 mm: memcontrol: c... |
701 702 703 704 |
error: page->mapping = NULL; page_ref_sub(page, nr); return error; |
46f65ec15 tmpfs: convert sh... |
705 706 707 |
} /* |
6922c0c7a tmpfs: convert sh... |
708 709 710 711 712 713 |
* Like delete_from_page_cache, but substitutes swap for page. */ static void shmem_delete_from_page_cache(struct page *page, void *radswap) { struct address_space *mapping = page->mapping; int error; |
800d8c63b shmem: add huge p... |
714 |
VM_BUG_ON_PAGE(PageCompound(page), page); |
b93b01631 page cache: use x... |
715 |
xa_lock_irq(&mapping->i_pages); |
62f945b6a shmem: Convert sh... |
716 |
error = shmem_replace_entry(mapping, page->index, page, radswap); |
6922c0c7a tmpfs: convert sh... |
717 718 |
page->mapping = NULL; mapping->nrpages--; |
0d1c20722 mm: memcontrol: s... |
719 720 |
__dec_lruvec_page_state(page, NR_FILE_PAGES); __dec_lruvec_page_state(page, NR_SHMEM); |
b93b01631 page cache: use x... |
721 |
xa_unlock_irq(&mapping->i_pages); |
09cbfeaf1 mm, fs: get rid o... |
722 |
put_page(page); |
6922c0c7a tmpfs: convert sh... |
723 724 725 726 |
BUG_ON(error); } /* |
c121d3bb7 shmem: Convert sh... |
727 |
* Remove swap entry from page cache, free the swap and its page cache. |
7a5d0fbb2 tmpfs: convert sh... |
728 729 730 731 |
*/ static int shmem_free_swap(struct address_space *mapping, pgoff_t index, void *radswap) { |
6dbaf22ce mm: shmem: save o... |
732 |
void *old; |
7a5d0fbb2 tmpfs: convert sh... |
733 |
|
55f3f7eab XArray: Add xa_cm... |
734 |
old = xa_cmpxchg_irq(&mapping->i_pages, index, radswap, NULL, 0); |
6dbaf22ce mm: shmem: save o... |
735 736 737 738 |
if (old != radswap) return -ENOENT; free_swap_and_cache(radix_to_swp_entry(radswap)); return 0; |
7a5d0fbb2 tmpfs: convert sh... |
739 740 741 |
} /* |
6a15a3709 mm, proc: reduce ... |
742 |
* Determine (in bytes) how many of the shmem object's pages mapped by the |
48131e03c mm, proc: reduce ... |
743 |
* given offsets are swapped out. |
6a15a3709 mm, proc: reduce ... |
744 |
* |
b93b01631 page cache: use x... |
745 |
* This is safe to call without i_mutex or the i_pages lock thanks to RCU, |
6a15a3709 mm, proc: reduce ... |
746 747 |
* as long as the inode doesn't go away and racy results are not a problem. */ |
48131e03c mm, proc: reduce ... |
748 749 |
unsigned long shmem_partial_swap_usage(struct address_space *mapping, pgoff_t start, pgoff_t end) |
6a15a3709 mm, proc: reduce ... |
750 |
{ |
7ae3424fb shmem: Convert sh... |
751 |
XA_STATE(xas, &mapping->i_pages, start); |
6a15a3709 mm, proc: reduce ... |
752 |
struct page *page; |
48131e03c mm, proc: reduce ... |
753 |
unsigned long swapped = 0; |
6a15a3709 mm, proc: reduce ... |
754 755 |
rcu_read_lock(); |
7ae3424fb shmem: Convert sh... |
756 757 |
xas_for_each(&xas, page, end - 1) { if (xas_retry(&xas, page)) |
2cf938aae mm: use radix_tre... |
758 |
continue; |
3159f943a xarray: Replace e... |
759 |
if (xa_is_value(page)) |
6a15a3709 mm, proc: reduce ... |
760 761 762 |
swapped++; if (need_resched()) { |
7ae3424fb shmem: Convert sh... |
763 |
xas_pause(&xas); |
6a15a3709 mm, proc: reduce ... |
764 |
cond_resched_rcu(); |
6a15a3709 mm, proc: reduce ... |
765 766 767 768 769 770 771 772 773 |
} } rcu_read_unlock(); return swapped << PAGE_SHIFT; } /* |
48131e03c mm, proc: reduce ... |
774 775 776 |
* Determine (in bytes) how many of the shmem object's pages mapped by the * given vma is swapped out. * |
b93b01631 page cache: use x... |
777 |
* This is safe to call without i_mutex or the i_pages lock thanks to RCU, |
48131e03c mm, proc: reduce ... |
778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 |
* as long as the inode doesn't go away and racy results are not a problem. */ unsigned long shmem_swap_usage(struct vm_area_struct *vma) { struct inode *inode = file_inode(vma->vm_file); struct shmem_inode_info *info = SHMEM_I(inode); struct address_space *mapping = inode->i_mapping; unsigned long swapped; /* Be careful as we don't hold info->lock */ swapped = READ_ONCE(info->swapped); /* * The easier cases are when the shmem object has nothing in swap, or * the vma maps it whole. Then we can simply use the stats that we * already track. */ if (!swapped) return 0; if (!vma->vm_pgoff && vma->vm_end - vma->vm_start >= inode->i_size) return swapped << PAGE_SHIFT; /* Here comes the more involved part */ return shmem_partial_swap_usage(mapping, linear_page_index(vma, vma->vm_start), linear_page_index(vma, vma->vm_end)); } /* |
245132643 SHM_UNLOCK: fix U... |
808 809 810 811 812 813 814 |
* SysV IPC SHM_UNLOCK restore Unevictable pages to their evictable lists. */ void shmem_unlock_mapping(struct address_space *mapping) { struct pagevec pvec; pgoff_t indices[PAGEVEC_SIZE]; pgoff_t index = 0; |
866798201 mm, pagevec: remo... |
815 |
pagevec_init(&pvec); |
245132643 SHM_UNLOCK: fix U... |
816 817 818 819 820 821 822 823 |
/* * Minor point, but we might as well stop if someone else SHM_LOCKs it. */ while (!mapping_unevictable(mapping)) { /* * Avoid pagevec_lookup(): find_get_pages() returns 0 as if it * has finished, if it hits a row of PAGEVEC_SIZE swap entries. */ |
0cd6144aa mm + fs: prepare ... |
824 825 |
pvec.nr = find_get_entries(mapping, index, PAGEVEC_SIZE, pvec.pages, indices); |
245132643 SHM_UNLOCK: fix U... |
826 827 828 |
if (!pvec.nr) break; index = indices[pvec.nr - 1] + 1; |
0cd6144aa mm + fs: prepare ... |
829 |
pagevec_remove_exceptionals(&pvec); |
64e3d12f7 mm, drm/i915: mar... |
830 |
check_move_unevictable_pages(&pvec); |
245132643 SHM_UNLOCK: fix U... |
831 832 833 |
pagevec_release(&pvec); cond_resched(); } |
7a5d0fbb2 tmpfs: convert sh... |
834 835 836 |
} /* |
71725ed10 mm: huge tmpfs: t... |
837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 |
* Check whether a hole-punch or truncation needs to split a huge page, * returning true if no split was required, or the split has been successful. * * Eviction (or truncation to 0 size) should never need to split a huge page; * but in rare cases might do so, if shmem_undo_range() failed to trylock on * head, and then succeeded to trylock on tail. * * A split can only succeed when there are no additional references on the * huge page: so the split below relies upon find_get_entries() having stopped * when it found a subpage of the huge page, without getting further references. */ static bool shmem_punch_compound(struct page *page, pgoff_t start, pgoff_t end) { if (!PageTransCompound(page)) return true; /* Just proceed to delete a huge page wholly within the range punched */ if (PageHead(page) && page->index >= start && page->index + HPAGE_PMD_NR <= end) return true; /* Try to split huge page, so we can truly punch the hole or truncate */ return split_huge_page(page) >= 0; } /* |
7f4446eef shmem: Comment fi... |
863 |
* Remove range of pages and swap entries from page cache, and free them. |
1635f6a74 tmpfs: undo fallo... |
864 |
* If !unfalloc, truncate or punch hole; if unfalloc, undo failed fallocate. |
7a5d0fbb2 tmpfs: convert sh... |
865 |
*/ |
1635f6a74 tmpfs: undo fallo... |
866 867 |
static void shmem_undo_range(struct inode *inode, loff_t lstart, loff_t lend, bool unfalloc) |
1da177e4c Linux-2.6.12-rc2 |
868 |
{ |
285b2c4fd tmpfs: demolish o... |
869 |
struct address_space *mapping = inode->i_mapping; |
1da177e4c Linux-2.6.12-rc2 |
870 |
struct shmem_inode_info *info = SHMEM_I(inode); |
09cbfeaf1 mm, fs: get rid o... |
871 872 873 874 |
pgoff_t start = (lstart + PAGE_SIZE - 1) >> PAGE_SHIFT; pgoff_t end = (lend + 1) >> PAGE_SHIFT; unsigned int partial_start = lstart & (PAGE_SIZE - 1); unsigned int partial_end = (lend + 1) & (PAGE_SIZE - 1); |
bda97eab0 tmpfs: copy trunc... |
875 |
struct pagevec pvec; |
7a5d0fbb2 tmpfs: convert sh... |
876 877 |
pgoff_t indices[PAGEVEC_SIZE]; long nr_swaps_freed = 0; |
285b2c4fd tmpfs: demolish o... |
878 |
pgoff_t index; |
bda97eab0 tmpfs: copy trunc... |
879 |
int i; |
83e4fa9c1 tmpfs: support fa... |
880 881 |
if (lend == -1) end = -1; /* unsigned, so actually very big */ |
bda97eab0 tmpfs: copy trunc... |
882 |
|
866798201 mm, pagevec: remo... |
883 |
pagevec_init(&pvec); |
bda97eab0 tmpfs: copy trunc... |
884 |
index = start; |
83e4fa9c1 tmpfs: support fa... |
885 |
while (index < end) { |
0cd6144aa mm + fs: prepare ... |
886 887 888 |
pvec.nr = find_get_entries(mapping, index, min(end - index, (pgoff_t)PAGEVEC_SIZE), pvec.pages, indices); |
7a5d0fbb2 tmpfs: convert sh... |
889 890 |
if (!pvec.nr) break; |
bda97eab0 tmpfs: copy trunc... |
891 892 |
for (i = 0; i < pagevec_count(&pvec); i++) { struct page *page = pvec.pages[i]; |
7a5d0fbb2 tmpfs: convert sh... |
893 |
index = indices[i]; |
83e4fa9c1 tmpfs: support fa... |
894 |
if (index >= end) |
bda97eab0 tmpfs: copy trunc... |
895 |
break; |
3159f943a xarray: Replace e... |
896 |
if (xa_is_value(page)) { |
1635f6a74 tmpfs: undo fallo... |
897 898 |
if (unfalloc) continue; |
7a5d0fbb2 tmpfs: convert sh... |
899 900 |
nr_swaps_freed += !shmem_free_swap(mapping, index, page); |
bda97eab0 tmpfs: copy trunc... |
901 |
continue; |
7a5d0fbb2 tmpfs: convert sh... |
902 |
} |
800d8c63b shmem: add huge p... |
903 |
VM_BUG_ON_PAGE(page_to_pgoff(page) != index, page); |
7a5d0fbb2 tmpfs: convert sh... |
904 |
if (!trylock_page(page)) |
bda97eab0 tmpfs: copy trunc... |
905 |
continue; |
800d8c63b shmem: add huge p... |
906 |
|
71725ed10 mm: huge tmpfs: t... |
907 908 909 910 |
if ((!unfalloc || !PageUptodate(page)) && page_mapping(page) == mapping) { VM_BUG_ON_PAGE(PageWriteback(page), page); if (shmem_punch_compound(page, start, end)) |
1635f6a74 tmpfs: undo fallo... |
911 |
truncate_inode_page(mapping, page); |
bda97eab0 tmpfs: copy trunc... |
912 |
} |
bda97eab0 tmpfs: copy trunc... |
913 914 |
unlock_page(page); } |
0cd6144aa mm + fs: prepare ... |
915 |
pagevec_remove_exceptionals(&pvec); |
245132643 SHM_UNLOCK: fix U... |
916 |
pagevec_release(&pvec); |
bda97eab0 tmpfs: copy trunc... |
917 918 919 |
cond_resched(); index++; } |
1da177e4c Linux-2.6.12-rc2 |
920 |
|
83e4fa9c1 tmpfs: support fa... |
921 |
if (partial_start) { |
bda97eab0 tmpfs: copy trunc... |
922 |
struct page *page = NULL; |
9e18eb293 tmpfs: mem_cgroup... |
923 |
shmem_getpage(inode, start - 1, &page, SGP_READ); |
bda97eab0 tmpfs: copy trunc... |
924 |
if (page) { |
09cbfeaf1 mm, fs: get rid o... |
925 |
unsigned int top = PAGE_SIZE; |
83e4fa9c1 tmpfs: support fa... |
926 927 928 929 930 931 932 |
if (start > end) { top = partial_end; partial_end = 0; } zero_user_segment(page, partial_start, top); set_page_dirty(page); unlock_page(page); |
09cbfeaf1 mm, fs: get rid o... |
933 |
put_page(page); |
83e4fa9c1 tmpfs: support fa... |
934 935 936 937 |
} } if (partial_end) { struct page *page = NULL; |
9e18eb293 tmpfs: mem_cgroup... |
938 |
shmem_getpage(inode, end, &page, SGP_READ); |
83e4fa9c1 tmpfs: support fa... |
939 940 |
if (page) { zero_user_segment(page, 0, partial_end); |
bda97eab0 tmpfs: copy trunc... |
941 942 |
set_page_dirty(page); unlock_page(page); |
09cbfeaf1 mm, fs: get rid o... |
943 |
put_page(page); |
bda97eab0 tmpfs: copy trunc... |
944 945 |
} } |
83e4fa9c1 tmpfs: support fa... |
946 947 |
if (start >= end) return; |
bda97eab0 tmpfs: copy trunc... |
948 949 |
index = start; |
b1a366500 shmem: fix splici... |
950 |
while (index < end) { |
bda97eab0 tmpfs: copy trunc... |
951 |
cond_resched(); |
0cd6144aa mm + fs: prepare ... |
952 953 |
pvec.nr = find_get_entries(mapping, index, |
83e4fa9c1 tmpfs: support fa... |
954 |
min(end - index, (pgoff_t)PAGEVEC_SIZE), |
0cd6144aa mm + fs: prepare ... |
955 |
pvec.pages, indices); |
7a5d0fbb2 tmpfs: convert sh... |
956 |
if (!pvec.nr) { |
b1a366500 shmem: fix splici... |
957 958 |
/* If all gone or hole-punch or unfalloc, we're done */ if (index == start || end != -1) |
bda97eab0 tmpfs: copy trunc... |
959 |
break; |
b1a366500 shmem: fix splici... |
960 |
/* But if truncating, restart to make sure all gone */ |
bda97eab0 tmpfs: copy trunc... |
961 962 963 |
index = start; continue; } |
bda97eab0 tmpfs: copy trunc... |
964 965 |
for (i = 0; i < pagevec_count(&pvec); i++) { struct page *page = pvec.pages[i]; |
7a5d0fbb2 tmpfs: convert sh... |
966 |
index = indices[i]; |
83e4fa9c1 tmpfs: support fa... |
967 |
if (index >= end) |
bda97eab0 tmpfs: copy trunc... |
968 |
break; |
3159f943a xarray: Replace e... |
969 |
if (xa_is_value(page)) { |
1635f6a74 tmpfs: undo fallo... |
970 971 |
if (unfalloc) continue; |
b1a366500 shmem: fix splici... |
972 973 974 975 976 977 |
if (shmem_free_swap(mapping, index, page)) { /* Swap was replaced by page: retry */ index--; break; } nr_swaps_freed++; |
7a5d0fbb2 tmpfs: convert sh... |
978 979 |
continue; } |
bda97eab0 tmpfs: copy trunc... |
980 |
lock_page(page); |
800d8c63b shmem: add huge p... |
981 |
|
1635f6a74 tmpfs: undo fallo... |
982 |
if (!unfalloc || !PageUptodate(page)) { |
71725ed10 mm: huge tmpfs: t... |
983 |
if (page_mapping(page) != mapping) { |
b1a366500 shmem: fix splici... |
984 985 986 987 |
/* Page was replaced by swap: retry */ unlock_page(page); index--; break; |
1635f6a74 tmpfs: undo fallo... |
988 |
} |
71725ed10 mm: huge tmpfs: t... |
989 990 991 |
VM_BUG_ON_PAGE(PageWriteback(page), page); if (shmem_punch_compound(page, start, end)) truncate_inode_page(mapping, page); |
0783ac95b mm/shmem: fix bui... |
992 |
else if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE)) { |
71725ed10 mm: huge tmpfs: t... |
993 994 995 996 997 998 999 1000 |
/* Wipe the page and don't get stuck */ clear_highpage(page); flush_dcache_page(page); set_page_dirty(page); if (index < round_up(start, HPAGE_PMD_NR)) start = index + 1; } |
7a5d0fbb2 tmpfs: convert sh... |
1001 |
} |
bda97eab0 tmpfs: copy trunc... |
1002 1003 |
unlock_page(page); } |
0cd6144aa mm + fs: prepare ... |
1004 |
pagevec_remove_exceptionals(&pvec); |
245132643 SHM_UNLOCK: fix U... |
1005 |
pagevec_release(&pvec); |
bda97eab0 tmpfs: copy trunc... |
1006 1007 |
index++; } |
94c1e62df tmpfs: take contr... |
1008 |
|
4595ef88d shmem: make shmem... |
1009 |
spin_lock_irq(&info->lock); |
7a5d0fbb2 tmpfs: convert sh... |
1010 |
info->swapped -= nr_swaps_freed; |
1da177e4c Linux-2.6.12-rc2 |
1011 |
shmem_recalc_inode(inode); |
4595ef88d shmem: make shmem... |
1012 |
spin_unlock_irq(&info->lock); |
1635f6a74 tmpfs: undo fallo... |
1013 |
} |
1da177e4c Linux-2.6.12-rc2 |
1014 |
|
1635f6a74 tmpfs: undo fallo... |
1015 1016 1017 |
void shmem_truncate_range(struct inode *inode, loff_t lstart, loff_t lend) { shmem_undo_range(inode, lstart, lend, false); |
078cd8279 fs: Replace CURRE... |
1018 |
inode->i_ctime = inode->i_mtime = current_time(inode); |
1da177e4c Linux-2.6.12-rc2 |
1019 |
} |
94c1e62df tmpfs: take contr... |
1020 |
EXPORT_SYMBOL_GPL(shmem_truncate_range); |
1da177e4c Linux-2.6.12-rc2 |
1021 |
|
a528d35e8 statx: Add a syst... |
1022 1023 |
static int shmem_getattr(const struct path *path, struct kstat *stat, u32 request_mask, unsigned int query_flags) |
44a30220b shmem: recalculat... |
1024 |
{ |
a528d35e8 statx: Add a syst... |
1025 |
struct inode *inode = path->dentry->d_inode; |
44a30220b shmem: recalculat... |
1026 |
struct shmem_inode_info *info = SHMEM_I(inode); |
89fdcd262 mm: shmem: make s... |
1027 |
struct shmem_sb_info *sb_info = SHMEM_SB(inode->i_sb); |
44a30220b shmem: recalculat... |
1028 |
|
d0424c429 tmpfs: avoid a li... |
1029 |
if (info->alloced - info->swapped != inode->i_mapping->nrpages) { |
4595ef88d shmem: make shmem... |
1030 |
spin_lock_irq(&info->lock); |
d0424c429 tmpfs: avoid a li... |
1031 |
shmem_recalc_inode(inode); |
4595ef88d shmem: make shmem... |
1032 |
spin_unlock_irq(&info->lock); |
d0424c429 tmpfs: avoid a li... |
1033 |
} |
44a30220b shmem: recalculat... |
1034 |
generic_fillattr(inode, stat); |
89fdcd262 mm: shmem: make s... |
1035 1036 1037 |
if (is_huge_enabled(sb_info)) stat->blksize = HPAGE_PMD_SIZE; |
44a30220b shmem: recalculat... |
1038 1039 |
return 0; } |
94c1e62df tmpfs: take contr... |
1040 |
static int shmem_setattr(struct dentry *dentry, struct iattr *attr) |
1da177e4c Linux-2.6.12-rc2 |
1041 |
{ |
75c3cfa85 VFS: assorted wei... |
1042 |
struct inode *inode = d_inode(dentry); |
40e041a2c shm: add sealing API |
1043 |
struct shmem_inode_info *info = SHMEM_I(inode); |
779750d20 shmem: split huge... |
1044 |
struct shmem_sb_info *sbinfo = SHMEM_SB(inode->i_sb); |
1da177e4c Linux-2.6.12-rc2 |
1045 |
int error; |
31051c85b fs: Give dentry t... |
1046 |
error = setattr_prepare(dentry, attr); |
db78b877f always call inode... |
1047 1048 |
if (error) return error; |
94c1e62df tmpfs: take contr... |
1049 1050 1051 |
if (S_ISREG(inode->i_mode) && (attr->ia_valid & ATTR_SIZE)) { loff_t oldsize = inode->i_size; loff_t newsize = attr->ia_size; |
3889e6e76 tmpfs: convert to... |
1052 |
|
40e041a2c shm: add sealing API |
1053 1054 1055 1056 |
/* protected by i_mutex */ if ((newsize < oldsize && (info->seals & F_SEAL_SHRINK)) || (newsize > oldsize && (info->seals & F_SEAL_GROW))) return -EPERM; |
94c1e62df tmpfs: take contr... |
1057 |
if (newsize != oldsize) { |
771425179 shmem: update mem... |
1058 1059 1060 1061 |
error = shmem_reacct_size(SHMEM_I(inode)->flags, oldsize, newsize); if (error) return error; |
94c1e62df tmpfs: take contr... |
1062 |
i_size_write(inode, newsize); |
078cd8279 fs: Replace CURRE... |
1063 |
inode->i_ctime = inode->i_mtime = current_time(inode); |
94c1e62df tmpfs: take contr... |
1064 |
} |
afa2db2fb tmpfs: truncate p... |
1065 |
if (newsize <= oldsize) { |
94c1e62df tmpfs: take contr... |
1066 |
loff_t holebegin = round_up(newsize, PAGE_SIZE); |
d0424c429 tmpfs: avoid a li... |
1067 1068 1069 1070 1071 1072 |
if (oldsize > holebegin) unmap_mapping_range(inode->i_mapping, holebegin, 0, 1); if (info->alloced) shmem_truncate_range(inode, newsize, (loff_t)-1); |
94c1e62df tmpfs: take contr... |
1073 |
/* unmap again to remove racily COWed private pages */ |
d0424c429 tmpfs: avoid a li... |
1074 1075 1076 |
if (oldsize > holebegin) unmap_mapping_range(inode->i_mapping, holebegin, 0, 1); |
779750d20 shmem: split huge... |
1077 1078 1079 1080 1081 |
/* * Part of the huge page can be beyond i_size: subject * to shrink under memory pressure. */ |
396bcc529 mm: remove CONFIG... |
1082 |
if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE)) { |
779750d20 shmem: split huge... |
1083 |
spin_lock(&sbinfo->shrinklist_lock); |
d041353dc mm: fix list corr... |
1084 1085 1086 1087 1088 |
/* * _careful to defend against unlocked access to * ->shrink_list in shmem_unused_huge_shrink() */ if (list_empty_careful(&info->shrinklist)) { |
779750d20 shmem: split huge... |
1089 1090 1091 1092 1093 1094 |
list_add_tail(&info->shrinklist, &sbinfo->shrinklist); sbinfo->shrinklist_len++; } spin_unlock(&sbinfo->shrinklist_lock); } |
94c1e62df tmpfs: take contr... |
1095 |
} |
1da177e4c Linux-2.6.12-rc2 |
1096 |
} |
db78b877f always call inode... |
1097 |
setattr_copy(inode, attr); |
db78b877f always call inode... |
1098 |
if (attr->ia_valid & ATTR_MODE) |
feda821e7 fs: remove generi... |
1099 |
error = posix_acl_chmod(inode, inode->i_mode); |
1da177e4c Linux-2.6.12-rc2 |
1100 1101 |
return error; } |
1f895f75d switch shmem.c to... |
1102 |
static void shmem_evict_inode(struct inode *inode) |
1da177e4c Linux-2.6.12-rc2 |
1103 |
{ |
1da177e4c Linux-2.6.12-rc2 |
1104 |
struct shmem_inode_info *info = SHMEM_I(inode); |
779750d20 shmem: split huge... |
1105 |
struct shmem_sb_info *sbinfo = SHMEM_SB(inode->i_sb); |
1da177e4c Linux-2.6.12-rc2 |
1106 |
|
3889e6e76 tmpfs: convert to... |
1107 |
if (inode->i_mapping->a_ops == &shmem_aops) { |
1da177e4c Linux-2.6.12-rc2 |
1108 1109 |
shmem_unacct_size(info->flags, inode->i_size); inode->i_size = 0; |
3889e6e76 tmpfs: convert to... |
1110 |
shmem_truncate_range(inode, 0, (loff_t)-1); |
779750d20 shmem: split huge... |
1111 1112 1113 1114 1115 1116 1117 1118 |
if (!list_empty(&info->shrinklist)) { spin_lock(&sbinfo->shrinklist_lock); if (!list_empty(&info->shrinklist)) { list_del_init(&info->shrinklist); sbinfo->shrinklist_len--; } spin_unlock(&sbinfo->shrinklist_lock); } |
af53d3e9e mm: swapoff: shme... |
1119 1120 1121 1122 |
while (!list_empty(&info->swaplist)) { /* Wait while shmem_unuse() is scanning this inode... */ wait_var_event(&info->stop_eviction, !atomic_read(&info->stop_eviction)); |
cb5f7b9a4 tmpfs: make shmem... |
1123 |
mutex_lock(&shmem_swaplist_mutex); |
af53d3e9e mm: swapoff: shme... |
1124 1125 1126 |
/* ...but beware of the race if we peeked too early */ if (!atomic_read(&info->stop_eviction)) list_del_init(&info->swaplist); |
cb5f7b9a4 tmpfs: make shmem... |
1127 |
mutex_unlock(&shmem_swaplist_mutex); |
1da177e4c Linux-2.6.12-rc2 |
1128 |
} |
3ed47db34 make sure that fr... |
1129 |
} |
b09e0fa4b tmpfs: implement ... |
1130 |
|
38f386574 xattr: extract si... |
1131 |
simple_xattrs_free(&info->xattrs); |
0f3c42f52 tmpfs: change fin... |
1132 |
WARN_ON(inode->i_blocks); |
5b04c6890 shmem: factor out... |
1133 |
shmem_free_inode(inode->i_sb); |
dbd5768f8 vfs: Rename end_w... |
1134 |
clear_inode(inode); |
1da177e4c Linux-2.6.12-rc2 |
1135 |
} |
b56a2d8af mm: rid swapoff o... |
1136 1137 1138 1139 1140 |
extern struct swap_info_struct *swap_info[]; static int shmem_find_swap_entries(struct address_space *mapping, pgoff_t start, unsigned int nr_entries, struct page **entries, pgoff_t *indices, |
870395465 mm: swapoff: shme... |
1141 |
unsigned int type, bool frontswap) |
478922e2b radix-tree: delet... |
1142 |
{ |
b56a2d8af mm: rid swapoff o... |
1143 1144 |
XA_STATE(xas, &mapping->i_pages, start); struct page *page; |
870395465 mm: swapoff: shme... |
1145 |
swp_entry_t entry; |
b56a2d8af mm: rid swapoff o... |
1146 1147 1148 1149 |
unsigned int ret = 0; if (!nr_entries) return 0; |
478922e2b radix-tree: delet... |
1150 1151 |
rcu_read_lock(); |
b56a2d8af mm: rid swapoff o... |
1152 1153 |
xas_for_each(&xas, page, ULONG_MAX) { if (xas_retry(&xas, page)) |
5b9c98f30 mm/shmem: add __r... |
1154 |
continue; |
b56a2d8af mm: rid swapoff o... |
1155 1156 |
if (!xa_is_value(page)) |
478922e2b radix-tree: delet... |
1157 |
continue; |
b56a2d8af mm: rid swapoff o... |
1158 |
|
870395465 mm: swapoff: shme... |
1159 1160 1161 1162 1163 1164 |
entry = radix_to_swp_entry(page); if (swp_type(entry) != type) continue; if (frontswap && !frontswap_test(swap_info[type], swp_offset(entry))) continue; |
b56a2d8af mm: rid swapoff o... |
1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 |
indices[ret] = xas.xa_index; entries[ret] = page; if (need_resched()) { xas_pause(&xas); cond_resched_rcu(); } if (++ret == nr_entries) break; |
478922e2b radix-tree: delet... |
1175 |
} |
478922e2b radix-tree: delet... |
1176 |
rcu_read_unlock(); |
e21a29552 shmem: Convert fi... |
1177 |
|
b56a2d8af mm: rid swapoff o... |
1178 |
return ret; |
478922e2b radix-tree: delet... |
1179 |
} |
46f65ec15 tmpfs: convert sh... |
1180 |
/* |
b56a2d8af mm: rid swapoff o... |
1181 1182 |
* Move the swapped pages for an inode to page cache. Returns the count * of pages swapped in, or the error in case of failure. |
46f65ec15 tmpfs: convert sh... |
1183 |
*/ |
b56a2d8af mm: rid swapoff o... |
1184 1185 |
static int shmem_unuse_swap_entries(struct inode *inode, struct pagevec pvec, pgoff_t *indices) |
1da177e4c Linux-2.6.12-rc2 |
1186 |
{ |
b56a2d8af mm: rid swapoff o... |
1187 1188 |
int i = 0; int ret = 0; |
bde05d1cc shmem: replace pa... |
1189 |
int error = 0; |
b56a2d8af mm: rid swapoff o... |
1190 |
struct address_space *mapping = inode->i_mapping; |
1da177e4c Linux-2.6.12-rc2 |
1191 |
|
b56a2d8af mm: rid swapoff o... |
1192 1193 |
for (i = 0; i < pvec.nr; i++) { struct page *page = pvec.pages[i]; |
2e0e26c76 tmpfs: open a win... |
1194 |
|
b56a2d8af mm: rid swapoff o... |
1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 |
if (!xa_is_value(page)) continue; error = shmem_swapin_page(inode, indices[i], &page, SGP_CACHE, mapping_gfp_mask(mapping), NULL, NULL); if (error == 0) { unlock_page(page); put_page(page); ret++; } if (error == -ENOMEM) break; error = 0; |
bde05d1cc shmem: replace pa... |
1209 |
} |
b56a2d8af mm: rid swapoff o... |
1210 1211 |
return error ? error : ret; } |
bde05d1cc shmem: replace pa... |
1212 |
|
b56a2d8af mm: rid swapoff o... |
1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 |
/* * If swap found in inode, free it and move page from swapcache to filecache. */ static int shmem_unuse_inode(struct inode *inode, unsigned int type, bool frontswap, unsigned long *fs_pages_to_unuse) { struct address_space *mapping = inode->i_mapping; pgoff_t start = 0; struct pagevec pvec; pgoff_t indices[PAGEVEC_SIZE]; bool frontswap_partial = (frontswap && *fs_pages_to_unuse > 0); int ret = 0; pagevec_init(&pvec); do { unsigned int nr_entries = PAGEVEC_SIZE; if (frontswap_partial && *fs_pages_to_unuse < PAGEVEC_SIZE) nr_entries = *fs_pages_to_unuse; pvec.nr = shmem_find_swap_entries(mapping, start, nr_entries, pvec.pages, indices, |
870395465 mm: swapoff: shme... |
1235 |
type, frontswap); |
b56a2d8af mm: rid swapoff o... |
1236 1237 1238 |
if (pvec.nr == 0) { ret = 0; break; |
46f65ec15 tmpfs: convert sh... |
1239 |
} |
b56a2d8af mm: rid swapoff o... |
1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 |
ret = shmem_unuse_swap_entries(inode, pvec, indices); if (ret < 0) break; if (frontswap_partial) { *fs_pages_to_unuse -= ret; if (*fs_pages_to_unuse == 0) { ret = FRONTSWAP_PAGES_UNUSED; break; } } start = indices[pvec.nr - 1]; } while (true); return ret; |
1da177e4c Linux-2.6.12-rc2 |
1257 1258 1259 |
} /* |
b56a2d8af mm: rid swapoff o... |
1260 1261 1262 |
* Read all the shared memory data that resides in the swap * device 'type' back into memory, so the swap device can be * unused. |
1da177e4c Linux-2.6.12-rc2 |
1263 |
*/ |
b56a2d8af mm: rid swapoff o... |
1264 1265 |
int shmem_unuse(unsigned int type, bool frontswap, unsigned long *fs_pages_to_unuse) |
1da177e4c Linux-2.6.12-rc2 |
1266 |
{ |
b56a2d8af mm: rid swapoff o... |
1267 |
struct shmem_inode_info *info, *next; |
bde05d1cc shmem: replace pa... |
1268 |
int error = 0; |
b56a2d8af mm: rid swapoff o... |
1269 1270 1271 1272 |
if (list_empty(&shmem_swaplist)) return 0; mutex_lock(&shmem_swaplist_mutex); |
b56a2d8af mm: rid swapoff o... |
1273 1274 |
list_for_each_entry_safe(info, next, &shmem_swaplist, swaplist) { if (!info->swapped) { |
6922c0c7a tmpfs: convert sh... |
1275 |
list_del_init(&info->swaplist); |
b56a2d8af mm: rid swapoff o... |
1276 1277 |
continue; } |
af53d3e9e mm: swapoff: shme... |
1278 1279 1280 1281 1282 1283 1284 |
/* * Drop the swaplist mutex while searching the inode for swap; * but before doing so, make sure shmem_evict_inode() will not * remove placeholder inode from swaplist, nor let it be freed * (igrab() would protect from unlink, but not from unmount). */ atomic_inc(&info->stop_eviction); |
b56a2d8af mm: rid swapoff o... |
1285 |
mutex_unlock(&shmem_swaplist_mutex); |
b56a2d8af mm: rid swapoff o... |
1286 |
|
af53d3e9e mm: swapoff: shme... |
1287 |
error = shmem_unuse_inode(&info->vfs_inode, type, frontswap, |
b56a2d8af mm: rid swapoff o... |
1288 |
fs_pages_to_unuse); |
cb5f7b9a4 tmpfs: make shmem... |
1289 |
cond_resched(); |
b56a2d8af mm: rid swapoff o... |
1290 1291 1292 1293 1294 |
mutex_lock(&shmem_swaplist_mutex); next = list_next_entry(info, swaplist); if (!info->swapped) list_del_init(&info->swaplist); |
af53d3e9e mm: swapoff: shme... |
1295 1296 |
if (atomic_dec_and_test(&info->stop_eviction)) wake_up_var(&info->stop_eviction); |
b56a2d8af mm: rid swapoff o... |
1297 |
if (error) |
778dd893a tmpfs: fix race b... |
1298 |
break; |
1da177e4c Linux-2.6.12-rc2 |
1299 |
} |
cb5f7b9a4 tmpfs: make shmem... |
1300 |
mutex_unlock(&shmem_swaplist_mutex); |
778dd893a tmpfs: fix race b... |
1301 |
|
778dd893a tmpfs: fix race b... |
1302 |
return error; |
1da177e4c Linux-2.6.12-rc2 |
1303 1304 1305 1306 1307 1308 1309 1310 |
} /* * Move the page from the page cache to the swap cache. */ static int shmem_writepage(struct page *page, struct writeback_control *wbc) { struct shmem_inode_info *info; |
1da177e4c Linux-2.6.12-rc2 |
1311 |
struct address_space *mapping; |
1da177e4c Linux-2.6.12-rc2 |
1312 |
struct inode *inode; |
6922c0c7a tmpfs: convert sh... |
1313 1314 |
swp_entry_t swap; pgoff_t index; |
1da177e4c Linux-2.6.12-rc2 |
1315 |
|
800d8c63b shmem: add huge p... |
1316 |
VM_BUG_ON_PAGE(PageCompound(page), page); |
1da177e4c Linux-2.6.12-rc2 |
1317 |
BUG_ON(!PageLocked(page)); |
1da177e4c Linux-2.6.12-rc2 |
1318 1319 1320 1321 1322 1323 |
mapping = page->mapping; index = page->index; inode = mapping->host; info = SHMEM_I(inode); if (info->flags & VM_LOCKED) goto redirty; |
d9fe526a8 tmpfs: allow file... |
1324 |
if (!total_swap_pages) |
1da177e4c Linux-2.6.12-rc2 |
1325 |
goto redirty; |
d9fe526a8 tmpfs: allow file... |
1326 |
/* |
97b713ba3 fs: kill BDI_CAP_... |
1327 1328 1329 1330 1331 |
* Our capabilities prevent regular writeback or sync from ever calling * shmem_writepage; but a stacking filesystem might use ->writepage of * its underlying filesystem, in which case tmpfs should write out to * swap only in response to memory pressure, and not for the writeback * threads or sync. |
d9fe526a8 tmpfs: allow file... |
1332 |
*/ |
48f170fb7 tmpfs: simplify u... |
1333 1334 1335 1336 |
if (!wbc->for_reclaim) { WARN_ON_ONCE(1); /* Still happens? Tell us about it! */ goto redirty; } |
1635f6a74 tmpfs: undo fallo... |
1337 1338 1339 1340 1341 |
/* * This is somewhat ridiculous, but without plumbing a SWAP_MAP_FALLOC * value into swapfile.c, the only way we can correctly account for a * fallocated page arriving here is now to initialize it and write it. |
1aac14003 tmpfs: quit when ... |
1342 1343 1344 1345 1346 1347 |
* * That's okay for a page already fallocated earlier, but if we have * not yet completed the fallocation, then (a) we want to keep track * of this page in case we have to undo it, and (b) it may not be a * good idea to continue anyway, once we're pushing into swap. So * reactivate the page, and let shmem_fallocate() quit when too many. |
1635f6a74 tmpfs: undo fallo... |
1348 1349 |
*/ if (!PageUptodate(page)) { |
1aac14003 tmpfs: quit when ... |
1350 1351 1352 1353 1354 |
if (inode->i_private) { struct shmem_falloc *shmem_falloc; spin_lock(&inode->i_lock); shmem_falloc = inode->i_private; if (shmem_falloc && |
8e205f779 shmem: fix faulti... |
1355 |
!shmem_falloc->waitq && |
1aac14003 tmpfs: quit when ... |
1356 1357 1358 1359 1360 1361 1362 1363 1364 |
index >= shmem_falloc->start && index < shmem_falloc->next) shmem_falloc->nr_unswapped++; else shmem_falloc = NULL; spin_unlock(&inode->i_lock); if (shmem_falloc) goto redirty; } |
1635f6a74 tmpfs: undo fallo... |
1365 1366 1367 1368 |
clear_highpage(page); flush_dcache_page(page); SetPageUptodate(page); } |
38d8b4e6b mm, THP, swap: de... |
1369 |
swap = get_swap_page(page); |
48f170fb7 tmpfs: simplify u... |
1370 1371 |
if (!swap.val) goto redirty; |
d9fe526a8 tmpfs: allow file... |
1372 |
|
b1dea800a tmpfs: fix race b... |
1373 1374 |
/* * Add inode to shmem_unuse()'s list of swapped-out inodes, |
6922c0c7a tmpfs: convert sh... |
1375 1376 |
* if it's not already there. Do it now before the page is * moved to swap cache, when its pagelock no longer protects |
b1dea800a tmpfs: fix race b... |
1377 |
* the inode from eviction. But don't unlock the mutex until |
6922c0c7a tmpfs: convert sh... |
1378 1379 |
* we've incremented swapped, because shmem_unuse_inode() will * prune a !swapped inode from the swaplist under this mutex. |
b1dea800a tmpfs: fix race b... |
1380 |
*/ |
48f170fb7 tmpfs: simplify u... |
1381 1382 |
mutex_lock(&shmem_swaplist_mutex); if (list_empty(&info->swaplist)) |
b56a2d8af mm: rid swapoff o... |
1383 |
list_add(&info->swaplist, &shmem_swaplist); |
b1dea800a tmpfs: fix race b... |
1384 |
|
4afab1cd2 mm: shmem: use pr... |
1385 |
if (add_to_swap_cache(page, swap, |
3852f6768 mm/swapcache: sup... |
1386 1387 |
__GFP_HIGH | __GFP_NOMEMALLOC | __GFP_NOWARN, NULL) == 0) { |
4595ef88d shmem: make shmem... |
1388 |
spin_lock_irq(&info->lock); |
6922c0c7a tmpfs: convert sh... |
1389 |
shmem_recalc_inode(inode); |
267a4c76b tmpfs: fix shmem_... |
1390 |
info->swapped++; |
4595ef88d shmem: make shmem... |
1391 |
spin_unlock_irq(&info->lock); |
6922c0c7a tmpfs: convert sh... |
1392 |
|
267a4c76b tmpfs: fix shmem_... |
1393 1394 |
swap_shmem_alloc(swap); shmem_delete_from_page_cache(page, swp_to_radix_entry(swap)); |
6922c0c7a tmpfs: convert sh... |
1395 |
mutex_unlock(&shmem_swaplist_mutex); |
d9fe526a8 tmpfs: allow file... |
1396 |
BUG_ON(page_mapped(page)); |
9fab5619b shmem: writepage ... |
1397 |
swap_writepage(page, wbc); |
1da177e4c Linux-2.6.12-rc2 |
1398 1399 |
return 0; } |
6922c0c7a tmpfs: convert sh... |
1400 |
mutex_unlock(&shmem_swaplist_mutex); |
75f6d6d29 mm, THP, swap: un... |
1401 |
put_swap_page(page, swap); |
1da177e4c Linux-2.6.12-rc2 |
1402 1403 |
redirty: set_page_dirty(page); |
d9fe526a8 tmpfs: allow file... |
1404 1405 1406 1407 |
if (wbc->for_reclaim) return AOP_WRITEPAGE_ACTIVATE; /* Return with page locked */ unlock_page(page); return 0; |
1da177e4c Linux-2.6.12-rc2 |
1408 |
} |
75edd345e tmpfs: preliminar... |
1409 |
#if defined(CONFIG_NUMA) && defined(CONFIG_TMPFS) |
71fe804b6 mempolicy: use st... |
1410 |
static void shmem_show_mpol(struct seq_file *seq, struct mempolicy *mpol) |
680d794ba mount options: fi... |
1411 |
{ |
095f1fc4e mempolicy: rework... |
1412 |
char buffer[64]; |
680d794ba mount options: fi... |
1413 |
|
71fe804b6 mempolicy: use st... |
1414 |
if (!mpol || mpol->mode == MPOL_DEFAULT) |
095f1fc4e mempolicy: rework... |
1415 |
return; /* show nothing */ |
680d794ba mount options: fi... |
1416 |
|
a7a88b237 mempolicy: remove... |
1417 |
mpol_to_str(buffer, sizeof(buffer), mpol); |
095f1fc4e mempolicy: rework... |
1418 1419 |
seq_printf(seq, ",mpol=%s", buffer); |
680d794ba mount options: fi... |
1420 |
} |
71fe804b6 mempolicy: use st... |
1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 |
static struct mempolicy *shmem_get_sbmpol(struct shmem_sb_info *sbinfo) { struct mempolicy *mpol = NULL; if (sbinfo->mpol) { spin_lock(&sbinfo->stat_lock); /* prevent replace/use races */ mpol = sbinfo->mpol; mpol_get(mpol); spin_unlock(&sbinfo->stat_lock); } return mpol; } |
75edd345e tmpfs: preliminar... |
1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 |
#else /* !CONFIG_NUMA || !CONFIG_TMPFS */ static inline void shmem_show_mpol(struct seq_file *seq, struct mempolicy *mpol) { } static inline struct mempolicy *shmem_get_sbmpol(struct shmem_sb_info *sbinfo) { return NULL; } #endif /* CONFIG_NUMA && CONFIG_TMPFS */ #ifndef CONFIG_NUMA #define vm_policy vm_private_data #endif |
680d794ba mount options: fi... |
1445 |
|
800d8c63b shmem: add huge p... |
1446 1447 1448 1449 |
static void shmem_pseudo_vma_init(struct vm_area_struct *vma, struct shmem_inode_info *info, pgoff_t index) { /* Create a pseudo vma that just contains the policy */ |
2c4541e24 mm: use vma_init(... |
1450 |
vma_init(vma, NULL); |
800d8c63b shmem: add huge p... |
1451 1452 |
/* Bias interleave by inode number to distribute better across nodes */ vma->vm_pgoff = index + info->vfs_inode.i_ino; |
800d8c63b shmem: add huge p... |
1453 1454 1455 1456 1457 1458 1459 1460 |
vma->vm_policy = mpol_shared_policy_lookup(&info->policy, index); } static void shmem_pseudo_vma_destroy(struct vm_area_struct *vma) { /* Drop reference taken by mpol_shared_policy_lookup() */ mpol_cond_put(vma->vm_policy); } |
41ffe5d5c tmpfs: miscellane... |
1461 1462 |
static struct page *shmem_swapin(swp_entry_t swap, gfp_t gfp, struct shmem_inode_info *info, pgoff_t index) |
1da177e4c Linux-2.6.12-rc2 |
1463 |
{ |
1da177e4c Linux-2.6.12-rc2 |
1464 |
struct vm_area_struct pvma; |
18a2f371f tmpfs: fix shared... |
1465 |
struct page *page; |
e9e9b7ece mm: swap: unify c... |
1466 |
struct vm_fault vmf; |
52cd3b074 mempolicy: rework... |
1467 |
|
800d8c63b shmem: add huge p... |
1468 |
shmem_pseudo_vma_init(&pvma, info, index); |
e9e9b7ece mm: swap: unify c... |
1469 1470 1471 |
vmf.vma = &pvma; vmf.address = 0; page = swap_cluster_readahead(swap, gfp, &vmf); |
800d8c63b shmem: add huge p... |
1472 |
shmem_pseudo_vma_destroy(&pvma); |
18a2f371f tmpfs: fix shared... |
1473 |
|
800d8c63b shmem: add huge p... |
1474 1475 1476 1477 1478 1479 1480 |
return page; } static struct page *shmem_alloc_hugepage(gfp_t gfp, struct shmem_inode_info *info, pgoff_t index) { struct vm_area_struct pvma; |
7b8d046fb shmem: Convert sh... |
1481 1482 |
struct address_space *mapping = info->vfs_inode.i_mapping; pgoff_t hindex; |
800d8c63b shmem: add huge p... |
1483 |
struct page *page; |
4620a06e4 shmem: Fix link e... |
1484 |
hindex = round_down(index, HPAGE_PMD_NR); |
7b8d046fb shmem: Convert sh... |
1485 1486 |
if (xa_find(&mapping->i_pages, &hindex, hindex + HPAGE_PMD_NR - 1, XA_PRESENT)) |
800d8c63b shmem: add huge p... |
1487 |
return NULL; |
18a2f371f tmpfs: fix shared... |
1488 |
|
800d8c63b shmem: add huge p... |
1489 1490 |
shmem_pseudo_vma_init(&pvma, info, hindex); page = alloc_pages_vma(gfp | __GFP_COMP | __GFP_NORETRY | __GFP_NOWARN, |
19deb7695 Revert "Revert "R... |
1491 |
HPAGE_PMD_ORDER, &pvma, 0, numa_node_id(), true); |
800d8c63b shmem: add huge p... |
1492 1493 1494 |
shmem_pseudo_vma_destroy(&pvma); if (page) prep_transhuge_page(page); |
dcdf11ee1 mm, shmem: add vm... |
1495 1496 |
else count_vm_event(THP_FILE_FALLBACK); |
18a2f371f tmpfs: fix shared... |
1497 |
return page; |
1da177e4c Linux-2.6.12-rc2 |
1498 |
} |
02098feaa swapin needs gfp_... |
1499 |
static struct page *shmem_alloc_page(gfp_t gfp, |
41ffe5d5c tmpfs: miscellane... |
1500 |
struct shmem_inode_info *info, pgoff_t index) |
1da177e4c Linux-2.6.12-rc2 |
1501 1502 |
{ struct vm_area_struct pvma; |
18a2f371f tmpfs: fix shared... |
1503 |
struct page *page; |
1da177e4c Linux-2.6.12-rc2 |
1504 |
|
800d8c63b shmem: add huge p... |
1505 1506 1507 1508 1509 1510 1511 1512 |
shmem_pseudo_vma_init(&pvma, info, index); page = alloc_page_vma(gfp, &pvma, 0); shmem_pseudo_vma_destroy(&pvma); return page; } static struct page *shmem_alloc_and_acct_page(gfp_t gfp, |
0f0796945 shmem: introduce ... |
1513 |
struct inode *inode, |
800d8c63b shmem: add huge p... |
1514 1515 |
pgoff_t index, bool huge) { |
0f0796945 shmem: introduce ... |
1516 |
struct shmem_inode_info *info = SHMEM_I(inode); |
800d8c63b shmem: add huge p... |
1517 1518 1519 |
struct page *page; int nr; int err = -ENOSPC; |
52cd3b074 mempolicy: rework... |
1520 |
|
396bcc529 mm: remove CONFIG... |
1521 |
if (!IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE)) |
800d8c63b shmem: add huge p... |
1522 1523 |
huge = false; nr = huge ? HPAGE_PMD_NR : 1; |
0f0796945 shmem: introduce ... |
1524 |
if (!shmem_inode_acct_block(inode, nr)) |
800d8c63b shmem: add huge p... |
1525 |
goto failed; |
800d8c63b shmem: add huge p... |
1526 1527 1528 1529 1530 |
if (huge) page = shmem_alloc_hugepage(gfp, info, index); else page = shmem_alloc_page(gfp, info, index); |
75edd345e tmpfs: preliminar... |
1531 1532 1533 |
if (page) { __SetPageLocked(page); __SetPageSwapBacked(page); |
800d8c63b shmem: add huge p... |
1534 |
return page; |
75edd345e tmpfs: preliminar... |
1535 |
} |
18a2f371f tmpfs: fix shared... |
1536 |
|
800d8c63b shmem: add huge p... |
1537 |
err = -ENOMEM; |
0f0796945 shmem: introduce ... |
1538 |
shmem_inode_unacct_blocks(inode, nr); |
800d8c63b shmem: add huge p... |
1539 1540 |
failed: return ERR_PTR(err); |
1da177e4c Linux-2.6.12-rc2 |
1541 |
} |
71fe804b6 mempolicy: use st... |
1542 |
|
1da177e4c Linux-2.6.12-rc2 |
1543 |
/* |
bde05d1cc shmem: replace pa... |
1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 |
* When a page is moved from swapcache to shmem filecache (either by the * usual swapin of shmem_getpage_gfp(), or by the less common swapoff of * shmem_unuse_inode()), it may have been read in earlier from swap, in * ignorance of the mapping it belongs to. If that mapping has special * constraints (like the gma500 GEM driver, which requires RAM below 4GB), * we may need to copy to a suitable page before moving to filecache. * * In a future release, this may well be extended to respect cpuset and * NUMA mempolicy, and applied also to anonymous pages in do_swap_page(); * but for now it is a simple matter of zone. */ static bool shmem_should_replace_page(struct page *page, gfp_t gfp) { return page_zonenum(page) > gfp_zone(gfp); } static int shmem_replace_page(struct page **pagep, gfp_t gfp, struct shmem_inode_info *info, pgoff_t index) { struct page *oldpage, *newpage; struct address_space *swap_mapping; |
c1cb20d43 mm: use swp_offse... |
1565 |
swp_entry_t entry; |
bde05d1cc shmem: replace pa... |
1566 1567 1568 1569 |
pgoff_t swap_index; int error; oldpage = *pagep; |
c1cb20d43 mm: use swp_offse... |
1570 1571 |
entry.val = page_private(oldpage); swap_index = swp_offset(entry); |
bde05d1cc shmem: replace pa... |
1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 |
swap_mapping = page_mapping(oldpage); /* * We have arrived here because our zones are constrained, so don't * limit chance of success by further cpuset and node constraints. */ gfp &= ~GFP_CONSTRAINT_MASK; newpage = shmem_alloc_page(gfp, info, index); if (!newpage) return -ENOMEM; |
bde05d1cc shmem: replace pa... |
1582 |
|
09cbfeaf1 mm, fs: get rid o... |
1583 |
get_page(newpage); |
bde05d1cc shmem: replace pa... |
1584 |
copy_highpage(newpage, oldpage); |
0142ef6cd shmem: replace_pa... |
1585 |
flush_dcache_page(newpage); |
bde05d1cc shmem: replace pa... |
1586 |
|
9956edf37 shmem: fix pagefl... |
1587 1588 |
__SetPageLocked(newpage); __SetPageSwapBacked(newpage); |
bde05d1cc shmem: replace pa... |
1589 |
SetPageUptodate(newpage); |
c1cb20d43 mm: use swp_offse... |
1590 |
set_page_private(newpage, entry.val); |
bde05d1cc shmem: replace pa... |
1591 1592 1593 1594 1595 1596 |
SetPageSwapCache(newpage); /* * Our caller will very soon move newpage out of swapcache, but it's * a nice clean interface for us to replace oldpage by newpage there. */ |
b93b01631 page cache: use x... |
1597 |
xa_lock_irq(&swap_mapping->i_pages); |
62f945b6a shmem: Convert sh... |
1598 |
error = shmem_replace_entry(swap_mapping, swap_index, oldpage, newpage); |
0142ef6cd shmem: replace_pa... |
1599 |
if (!error) { |
0d1c20722 mm: memcontrol: s... |
1600 1601 1602 |
mem_cgroup_migrate(oldpage, newpage); __inc_lruvec_page_state(newpage, NR_FILE_PAGES); __dec_lruvec_page_state(oldpage, NR_FILE_PAGES); |
0142ef6cd shmem: replace_pa... |
1603 |
} |
b93b01631 page cache: use x... |
1604 |
xa_unlock_irq(&swap_mapping->i_pages); |
bde05d1cc shmem: replace pa... |
1605 |
|
0142ef6cd shmem: replace_pa... |
1606 1607 1608 1609 1610 1611 1612 1613 |
if (unlikely(error)) { /* * Is this possible? I think not, now that our callers check * both PageSwapCache and page_private after getting page lock; * but be defensive. Reverse old to newpage for clear and free. */ oldpage = newpage; } else { |
6058eaec8 mm: fold and remo... |
1614 |
lru_cache_add(newpage); |
0142ef6cd shmem: replace_pa... |
1615 1616 |
*pagep = newpage; } |
bde05d1cc shmem: replace pa... |
1617 1618 1619 1620 1621 |
ClearPageSwapCache(oldpage); set_page_private(oldpage, 0); unlock_page(oldpage); |
09cbfeaf1 mm, fs: get rid o... |
1622 1623 |
put_page(oldpage); put_page(oldpage); |
0142ef6cd shmem: replace_pa... |
1624 |
return error; |
bde05d1cc shmem: replace pa... |
1625 1626 1627 |
} /* |
c5bf121e4 mm: refactor swap... |
1628 1629 1630 |
* Swap in the page pointed to by *pagep. * Caller has to make sure that *pagep contains a valid swapped page. * Returns 0 and the page in pagep if success. On failure, returns the |
af44c12fe mm/shmem.c: delet... |
1631 |
* error code and NULL in *pagep. |
c5bf121e4 mm: refactor swap... |
1632 1633 1634 1635 1636 1637 1638 1639 1640 |
*/ static int shmem_swapin_page(struct inode *inode, pgoff_t index, struct page **pagep, enum sgp_type sgp, gfp_t gfp, struct vm_area_struct *vma, vm_fault_t *fault_type) { struct address_space *mapping = inode->i_mapping; struct shmem_inode_info *info = SHMEM_I(inode); struct mm_struct *charge_mm = vma ? vma->vm_mm : current->mm; |
c5bf121e4 mm: refactor swap... |
1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 |
struct page *page; swp_entry_t swap; int error; VM_BUG_ON(!*pagep || !xa_is_value(*pagep)); swap = radix_to_swp_entry(*pagep); *pagep = NULL; /* Look it up and read it in.. */ page = lookup_swap_cache(swap, NULL, 0); if (!page) { /* Or update major stats only when swapin succeeds?? */ if (fault_type) { *fault_type |= VM_FAULT_MAJOR; count_vm_event(PGMAJFAULT); count_memcg_event_mm(charge_mm, PGMAJFAULT); } /* Here we actually start the io */ page = shmem_swapin(swap, gfp, info, index); if (!page) { error = -ENOMEM; goto failed; } } /* We have to do this with page locked to prevent races */ lock_page(page); if (!PageSwapCache(page) || page_private(page) != swap.val || !shmem_confirm_swap(mapping, index, swap)) { error = -EEXIST; goto unlock; } if (!PageUptodate(page)) { error = -EIO; goto failed; } wait_on_page_writeback(page); |
8a84802e2 mm: Add arch hook... |
1678 1679 1680 1681 1682 |
/* * Some architectures may have to restore extra metadata to the * physical page after reading from swap. */ arch_swap_restore(swap, page); |
c5bf121e4 mm: refactor swap... |
1683 1684 1685 1686 1687 |
if (shmem_should_replace_page(page, gfp)) { error = shmem_replace_page(&page, gfp, info, index); if (error) goto failed; } |
14235ab36 mm: shmem: remove... |
1688 |
error = shmem_add_to_page_cache(page, mapping, index, |
3fea5a499 mm: memcontrol: c... |
1689 1690 |
swp_to_radix_entry(swap), gfp, charge_mm); |
c5bf121e4 mm: refactor swap... |
1691 1692 |
if (error) goto failed; |
c5bf121e4 mm: refactor swap... |
1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 |
spin_lock_irq(&info->lock); info->swapped--; shmem_recalc_inode(inode); spin_unlock_irq(&info->lock); if (sgp == SGP_WRITE) mark_page_accessed(page); delete_from_swap_cache(page); set_page_dirty(page); swap_free(swap); *pagep = page; return 0; failed: if (!shmem_confirm_swap(mapping, index, swap)) error = -EEXIST; unlock: if (page) { unlock_page(page); put_page(page); } return error; } /* |
68da9f055 tmpfs: pass gfp t... |
1720 |
* shmem_getpage_gfp - find page in cache, or get from swap, or allocate |
1da177e4c Linux-2.6.12-rc2 |
1721 1722 1723 |
* * If we allocate a new one we do not mark it dirty. That's up to the * vm. If we swap it in we mark it dirty since we also free the swap |
9e18eb293 tmpfs: mem_cgroup... |
1724 1725 |
* entry since a page cannot live in both the swap and page cache. * |
28eb3c808 shmem: fix obsole... |
1726 |
* vmf and fault_type are only supplied by shmem_fault: |
9e18eb293 tmpfs: mem_cgroup... |
1727 |
* otherwise they are NULL. |
1da177e4c Linux-2.6.12-rc2 |
1728 |
*/ |
41ffe5d5c tmpfs: miscellane... |
1729 |
static int shmem_getpage_gfp(struct inode *inode, pgoff_t index, |
9e18eb293 tmpfs: mem_cgroup... |
1730 |
struct page **pagep, enum sgp_type sgp, gfp_t gfp, |
2b7403035 mm: Change return... |
1731 1732 |
struct vm_area_struct *vma, struct vm_fault *vmf, vm_fault_t *fault_type) |
1da177e4c Linux-2.6.12-rc2 |
1733 1734 |
{ struct address_space *mapping = inode->i_mapping; |
23f919d4a shmem: avoid mayb... |
1735 |
struct shmem_inode_info *info = SHMEM_I(inode); |
1da177e4c Linux-2.6.12-rc2 |
1736 |
struct shmem_sb_info *sbinfo; |
9e18eb293 tmpfs: mem_cgroup... |
1737 |
struct mm_struct *charge_mm; |
27ab70062 tmpfs: simplify f... |
1738 |
struct page *page; |
657e3038c shmem, thp: respe... |
1739 |
enum sgp_type sgp_huge = sgp; |
800d8c63b shmem: add huge p... |
1740 |
pgoff_t hindex = index; |
1da177e4c Linux-2.6.12-rc2 |
1741 |
int error; |
54af60421 tmpfs: convert sh... |
1742 |
int once = 0; |
1635f6a74 tmpfs: undo fallo... |
1743 |
int alloced = 0; |
1da177e4c Linux-2.6.12-rc2 |
1744 |
|
09cbfeaf1 mm, fs: get rid o... |
1745 |
if (index > (MAX_LFS_FILESIZE >> PAGE_SHIFT)) |
1da177e4c Linux-2.6.12-rc2 |
1746 |
return -EFBIG; |
657e3038c shmem, thp: respe... |
1747 1748 |
if (sgp == SGP_NOHUGE || sgp == SGP_HUGE) sgp = SGP_CACHE; |
1da177e4c Linux-2.6.12-rc2 |
1749 |
repeat: |
c5bf121e4 mm: refactor swap... |
1750 1751 1752 1753 1754 1755 1756 |
if (sgp <= SGP_CACHE && ((loff_t)index << PAGE_SHIFT) >= i_size_read(inode)) { return -EINVAL; } sbinfo = SHMEM_SB(inode->i_sb); charge_mm = vma ? vma->vm_mm : current->mm; |
0cd6144aa mm + fs: prepare ... |
1757 |
page = find_lock_entry(mapping, index); |
3159f943a xarray: Replace e... |
1758 |
if (xa_is_value(page)) { |
c5bf121e4 mm: refactor swap... |
1759 1760 1761 1762 |
error = shmem_swapin_page(inode, index, &page, sgp, gfp, vma, fault_type); if (error == -EEXIST) goto repeat; |
54af60421 tmpfs: convert sh... |
1763 |
|
c5bf121e4 mm: refactor swap... |
1764 1765 |
*pagep = page; return error; |
54af60421 tmpfs: convert sh... |
1766 |
} |
63ec1973d mm/shmem: return ... |
1767 1768 |
if (page) hindex = page->index; |
66d2f4d28 shmem: fix init_p... |
1769 1770 |
if (page && sgp == SGP_WRITE) mark_page_accessed(page); |
1635f6a74 tmpfs: undo fallo... |
1771 1772 1773 1774 1775 |
/* fallocated page? */ if (page && !PageUptodate(page)) { if (sgp != SGP_READ) goto clear; unlock_page(page); |
09cbfeaf1 mm, fs: get rid o... |
1776 |
put_page(page); |
1635f6a74 tmpfs: undo fallo... |
1777 |
page = NULL; |
63ec1973d mm/shmem: return ... |
1778 |
hindex = index; |
1635f6a74 tmpfs: undo fallo... |
1779 |
} |
63ec1973d mm/shmem: return ... |
1780 1781 |
if (page || sgp == SGP_READ) goto out; |
27ab70062 tmpfs: simplify f... |
1782 1783 |
/* |
54af60421 tmpfs: convert sh... |
1784 1785 |
* Fast cache lookup did not find it: * bring it back from swap or allocate. |
27ab70062 tmpfs: simplify f... |
1786 |
*/ |
54af60421 tmpfs: convert sh... |
1787 |
|
c5bf121e4 mm: refactor swap... |
1788 1789 1790 1791 |
if (vma && userfaultfd_missing(vma)) { *fault_type = handle_userfault(vmf, VM_UFFD_MISSING); return 0; } |
cfda05267 userfaultfd: shme... |
1792 |
|
c5bf121e4 mm: refactor swap... |
1793 1794 1795 1796 1797 1798 1799 1800 |
/* shmem_symlink() */ if (mapping->a_ops != &shmem_aops) goto alloc_nohuge; if (shmem_huge == SHMEM_HUGE_DENY || sgp_huge == SGP_NOHUGE) goto alloc_nohuge; if (shmem_huge == SHMEM_HUGE_FORCE) goto alloc_huge; switch (sbinfo->huge) { |
c5bf121e4 mm: refactor swap... |
1801 1802 |
case SHMEM_HUGE_NEVER: goto alloc_nohuge; |
27d80fa24 mm/shmem.c: distr... |
1803 1804 1805 |
case SHMEM_HUGE_WITHIN_SIZE: { loff_t i_size; pgoff_t off; |
c5bf121e4 mm: refactor swap... |
1806 1807 1808 1809 |
off = round_up(index, HPAGE_PMD_NR); i_size = round_up(i_size_read(inode), PAGE_SIZE); if (i_size >= HPAGE_PMD_SIZE && i_size >> PAGE_SHIFT >= off) |
800d8c63b shmem: add huge p... |
1810 |
goto alloc_huge; |
27d80fa24 mm/shmem.c: distr... |
1811 1812 1813 |
fallthrough; } |
c5bf121e4 mm: refactor swap... |
1814 1815 1816 1817 1818 1819 |
case SHMEM_HUGE_ADVISE: if (sgp_huge == SGP_HUGE) goto alloc_huge; /* TODO: implement fadvise() hints */ goto alloc_nohuge; } |
1da177e4c Linux-2.6.12-rc2 |
1820 |
|
800d8c63b shmem: add huge p... |
1821 |
alloc_huge: |
c5bf121e4 mm: refactor swap... |
1822 1823 1824 1825 1826 1827 1828 1829 |
page = shmem_alloc_and_acct_page(gfp, inode, index, true); if (IS_ERR(page)) { alloc_nohuge: page = shmem_alloc_and_acct_page(gfp, inode, index, false); } if (IS_ERR(page)) { int retry = 5; |
800d8c63b shmem: add huge p... |
1830 |
|
c5bf121e4 mm: refactor swap... |
1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 |
error = PTR_ERR(page); page = NULL; if (error != -ENOSPC) goto unlock; /* * Try to reclaim some space by splitting a huge page * beyond i_size on the filesystem. */ while (retry--) { int ret; |
66d2f4d28 shmem: fix init_p... |
1841 |
|
c5bf121e4 mm: refactor swap... |
1842 1843 1844 1845 1846 |
ret = shmem_unused_huge_shrink(sbinfo, NULL, 1); if (ret == SHRINK_STOP) break; if (ret) goto alloc_nohuge; |
b065b4321 shmem: cleanup sh... |
1847 |
} |
c5bf121e4 mm: refactor swap... |
1848 1849 |
goto unlock; } |
54af60421 tmpfs: convert sh... |
1850 |
|
c5bf121e4 mm: refactor swap... |
1851 1852 1853 1854 |
if (PageTransHuge(page)) hindex = round_down(index, HPAGE_PMD_NR); else hindex = index; |
54af60421 tmpfs: convert sh... |
1855 |
|
c5bf121e4 mm: refactor swap... |
1856 1857 |
if (sgp == SGP_WRITE) __SetPageReferenced(page); |
c5bf121e4 mm: refactor swap... |
1858 |
error = shmem_add_to_page_cache(page, mapping, hindex, |
3fea5a499 mm: memcontrol: c... |
1859 1860 1861 |
NULL, gfp & GFP_RECLAIM_MASK, charge_mm); if (error) |
c5bf121e4 mm: refactor swap... |
1862 |
goto unacct; |
6058eaec8 mm: fold and remo... |
1863 |
lru_cache_add(page); |
779750d20 shmem: split huge... |
1864 |
|
c5bf121e4 mm: refactor swap... |
1865 |
spin_lock_irq(&info->lock); |
d8c6546b1 mm: introduce com... |
1866 |
info->alloced += compound_nr(page); |
c5bf121e4 mm: refactor swap... |
1867 1868 1869 1870 1871 1872 1873 1874 |
inode->i_blocks += BLOCKS_PER_PAGE << compound_order(page); shmem_recalc_inode(inode); spin_unlock_irq(&info->lock); alloced = true; if (PageTransHuge(page) && DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE) < hindex + HPAGE_PMD_NR - 1) { |
ec9516fbc tmpfs: optimize c... |
1875 |
/* |
c5bf121e4 mm: refactor swap... |
1876 1877 |
* Part of the huge page is beyond i_size: subject * to shrink under memory pressure. |
1635f6a74 tmpfs: undo fallo... |
1878 |
*/ |
c5bf121e4 mm: refactor swap... |
1879 |
spin_lock(&sbinfo->shrinklist_lock); |
1635f6a74 tmpfs: undo fallo... |
1880 |
/* |
c5bf121e4 mm: refactor swap... |
1881 1882 |
* _careful to defend against unlocked access to * ->shrink_list in shmem_unused_huge_shrink() |
ec9516fbc tmpfs: optimize c... |
1883 |
*/ |
c5bf121e4 mm: refactor swap... |
1884 1885 1886 1887 1888 1889 1890 |
if (list_empty_careful(&info->shrinklist)) { list_add_tail(&info->shrinklist, &sbinfo->shrinklist); sbinfo->shrinklist_len++; } spin_unlock(&sbinfo->shrinklist_lock); } |
800d8c63b shmem: add huge p... |
1891 |
|
c5bf121e4 mm: refactor swap... |
1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 |
/* * Let SGP_FALLOC use the SGP_WRITE optimization on a new page. */ if (sgp == SGP_FALLOC) sgp = SGP_WRITE; clear: /* * Let SGP_WRITE caller clear ends if write does not fill page; * but SGP_FALLOC on a page fallocated earlier must initialize * it now, lest undo on failure cancel our earlier guarantee. */ if (sgp != SGP_WRITE && !PageUptodate(page)) { |
c5bf121e4 mm: refactor swap... |
1904 |
int i; |
63ec1973d mm/shmem: return ... |
1905 1906 1907 |
for (i = 0; i < compound_nr(page); i++) { clear_highpage(page + i); flush_dcache_page(page + i); |
ec9516fbc tmpfs: optimize c... |
1908 |
} |
63ec1973d mm/shmem: return ... |
1909 |
SetPageUptodate(page); |
1da177e4c Linux-2.6.12-rc2 |
1910 |
} |
bde05d1cc shmem: replace pa... |
1911 |
|
54af60421 tmpfs: convert sh... |
1912 |
/* Perhaps the file has been truncated since we checked */ |
75edd345e tmpfs: preliminar... |
1913 |
if (sgp <= SGP_CACHE && |
09cbfeaf1 mm, fs: get rid o... |
1914 |
((loff_t)index << PAGE_SHIFT) >= i_size_read(inode)) { |
267a4c76b tmpfs: fix shmem_... |
1915 1916 1917 |
if (alloced) { ClearPageDirty(page); delete_from_page_cache(page); |
4595ef88d shmem: make shmem... |
1918 |
spin_lock_irq(&info->lock); |
267a4c76b tmpfs: fix shmem_... |
1919 |
shmem_recalc_inode(inode); |
4595ef88d shmem: make shmem... |
1920 |
spin_unlock_irq(&info->lock); |
267a4c76b tmpfs: fix shmem_... |
1921 |
} |
54af60421 tmpfs: convert sh... |
1922 |
error = -EINVAL; |
267a4c76b tmpfs: fix shmem_... |
1923 |
goto unlock; |
e83c32e8f tmpfs: simplify p... |
1924 |
} |
63ec1973d mm/shmem: return ... |
1925 |
out: |
800d8c63b shmem: add huge p... |
1926 |
*pagep = page + index - hindex; |
54af60421 tmpfs: convert sh... |
1927 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
1928 |
|
59a16ead5 tmpfs: fix spurio... |
1929 |
/* |
54af60421 tmpfs: convert sh... |
1930 |
* Error recovery. |
59a16ead5 tmpfs: fix spurio... |
1931 |
*/ |
54af60421 tmpfs: convert sh... |
1932 |
unacct: |
d8c6546b1 mm: introduce com... |
1933 |
shmem_inode_unacct_blocks(inode, compound_nr(page)); |
800d8c63b shmem: add huge p... |
1934 1935 1936 1937 1938 1939 |
if (PageTransHuge(page)) { unlock_page(page); put_page(page); goto alloc_nohuge; } |
d18992286 shmem: fix negati... |
1940 |
unlock: |
27ab70062 tmpfs: simplify f... |
1941 |
if (page) { |
54af60421 tmpfs: convert sh... |
1942 |
unlock_page(page); |
09cbfeaf1 mm, fs: get rid o... |
1943 |
put_page(page); |
54af60421 tmpfs: convert sh... |
1944 1945 |
} if (error == -ENOSPC && !once++) { |
4595ef88d shmem: make shmem... |
1946 |
spin_lock_irq(&info->lock); |
54af60421 tmpfs: convert sh... |
1947 |
shmem_recalc_inode(inode); |
4595ef88d shmem: make shmem... |
1948 |
spin_unlock_irq(&info->lock); |
27ab70062 tmpfs: simplify f... |
1949 |
goto repeat; |
ff36b8016 shmem: reduce pag... |
1950 |
} |
7f4446eef shmem: Comment fi... |
1951 |
if (error == -EEXIST) |
54af60421 tmpfs: convert sh... |
1952 1953 |
goto repeat; return error; |
1da177e4c Linux-2.6.12-rc2 |
1954 |
} |
10d20bd25 shmem: fix shm fa... |
1955 1956 1957 1958 1959 |
/* * This is like autoremove_wake_function, but it removes the wait queue * entry unconditionally - even if something else had already woken the * target. */ |
ac6424b98 sched/wait: Renam... |
1960 |
static int synchronous_wake_function(wait_queue_entry_t *wait, unsigned mode, int sync, void *key) |
10d20bd25 shmem: fix shm fa... |
1961 1962 |
{ int ret = default_wake_function(wait, mode, sync, key); |
2055da973 sched/wait: Disam... |
1963 |
list_del_init(&wait->entry); |
10d20bd25 shmem: fix shm fa... |
1964 1965 |
return ret; } |
20acce679 mm/shmem.c: use n... |
1966 |
static vm_fault_t shmem_fault(struct vm_fault *vmf) |
1da177e4c Linux-2.6.12-rc2 |
1967 |
{ |
11bac8000 mm, fs: reduce fa... |
1968 |
struct vm_area_struct *vma = vmf->vma; |
496ad9aa8 new helper: file_... |
1969 |
struct inode *inode = file_inode(vma->vm_file); |
9e18eb293 tmpfs: mem_cgroup... |
1970 |
gfp_t gfp = mapping_gfp_mask(inode->i_mapping); |
657e3038c shmem, thp: respe... |
1971 |
enum sgp_type sgp; |
20acce679 mm/shmem.c: use n... |
1972 1973 |
int err; vm_fault_t ret = VM_FAULT_LOCKED; |
1da177e4c Linux-2.6.12-rc2 |
1974 |
|
f00cdc6df shmem: fix faulti... |
1975 1976 1977 1978 |
/* * Trinity finds that probing a hole which tmpfs is punching can * prevent the hole-punch from ever completing: which in turn * locks writers out with its hold on i_mutex. So refrain from |
8e205f779 shmem: fix faulti... |
1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 |
* faulting pages into the hole while it's being punched. Although * shmem_undo_range() does remove the additions, it may be unable to * keep up, as each new page needs its own unmap_mapping_range() call, * and the i_mmap tree grows ever slower to scan if new vmas are added. * * It does not matter if we sometimes reach this check just before the * hole-punch begins, so that one fault then races with the punch: * we just need to make racing faults a rare case. * * The implementation below would be much simpler if we just used a * standard mutex or completion: but we cannot take i_mutex in fault, * and bloating every shmem inode for this unlikely case would be sad. |
f00cdc6df shmem: fix faulti... |
1991 1992 1993 1994 1995 1996 |
*/ if (unlikely(inode->i_private)) { struct shmem_falloc *shmem_falloc; spin_lock(&inode->i_lock); shmem_falloc = inode->i_private; |
8e205f779 shmem: fix faulti... |
1997 1998 1999 2000 |
if (shmem_falloc && shmem_falloc->waitq && vmf->pgoff >= shmem_falloc->start && vmf->pgoff < shmem_falloc->next) { |
8897c1b1a shmem: pin the fi... |
2001 |
struct file *fpin; |
8e205f779 shmem: fix faulti... |
2002 |
wait_queue_head_t *shmem_falloc_waitq; |
10d20bd25 shmem: fix shm fa... |
2003 |
DEFINE_WAIT_FUNC(shmem_fault_wait, synchronous_wake_function); |
8e205f779 shmem: fix faulti... |
2004 2005 |
ret = VM_FAULT_NOPAGE; |
8897c1b1a shmem: pin the fi... |
2006 2007 |
fpin = maybe_unlock_mmap_for_io(vmf, NULL); if (fpin) |
8e205f779 shmem: fix faulti... |
2008 |
ret = VM_FAULT_RETRY; |
8e205f779 shmem: fix faulti... |
2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 |
shmem_falloc_waitq = shmem_falloc->waitq; prepare_to_wait(shmem_falloc_waitq, &shmem_fault_wait, TASK_UNINTERRUPTIBLE); spin_unlock(&inode->i_lock); schedule(); /* * shmem_falloc_waitq points into the shmem_fallocate() * stack of the hole-punching task: shmem_falloc_waitq * is usually invalid by the time we reach here, but * finish_wait() does not dereference it in that case; * though i_lock needed lest racing with wake_up_all(). */ spin_lock(&inode->i_lock); finish_wait(shmem_falloc_waitq, &shmem_fault_wait); spin_unlock(&inode->i_lock); |
8897c1b1a shmem: pin the fi... |
2026 2027 2028 |
if (fpin) fput(fpin); |
8e205f779 shmem: fix faulti... |
2029 |
return ret; |
f00cdc6df shmem: fix faulti... |
2030 |
} |
8e205f779 shmem: fix faulti... |
2031 |
spin_unlock(&inode->i_lock); |
f00cdc6df shmem: fix faulti... |
2032 |
} |
657e3038c shmem, thp: respe... |
2033 |
sgp = SGP_CACHE; |
186003323 mm: make PR_SET_T... |
2034 2035 2036 |
if ((vma->vm_flags & VM_NOHUGEPAGE) || test_bit(MMF_DISABLE_THP, &vma->vm_mm->flags)) |
657e3038c shmem, thp: respe... |
2037 |
sgp = SGP_NOHUGE; |
186003323 mm: make PR_SET_T... |
2038 2039 |
else if (vma->vm_flags & VM_HUGEPAGE) sgp = SGP_HUGE; |
657e3038c shmem, thp: respe... |
2040 |
|
20acce679 mm/shmem.c: use n... |
2041 |
err = shmem_getpage_gfp(inode, vmf->pgoff, &vmf->page, sgp, |
cfda05267 userfaultfd: shme... |
2042 |
gfp, vma, vmf, &ret); |
20acce679 mm/shmem.c: use n... |
2043 2044 |
if (err) return vmf_error(err); |
68da9f055 tmpfs: pass gfp t... |
2045 |
return ret; |
1da177e4c Linux-2.6.12-rc2 |
2046 |
} |
c01d5b300 shmem: get_unmapp... |
2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 |
unsigned long shmem_get_unmapped_area(struct file *file, unsigned long uaddr, unsigned long len, unsigned long pgoff, unsigned long flags) { unsigned long (*get_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); unsigned long addr; unsigned long offset; unsigned long inflated_len; unsigned long inflated_addr; unsigned long inflated_offset; if (len > TASK_SIZE) return -ENOMEM; get_area = current->mm->get_unmapped_area; addr = get_area(file, uaddr, len, pgoff, flags); |
396bcc529 mm: remove CONFIG... |
2064 |
if (!IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE)) |
c01d5b300 shmem: get_unmapp... |
2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 |
return addr; if (IS_ERR_VALUE(addr)) return addr; if (addr & ~PAGE_MASK) return addr; if (addr > TASK_SIZE - len) return addr; if (shmem_huge == SHMEM_HUGE_DENY) return addr; if (len < HPAGE_PMD_SIZE) return addr; if (flags & MAP_FIXED) return addr; /* * Our priority is to support MAP_SHARED mapped hugely; * and support MAP_PRIVATE mapped hugely too, until it is COWed. |
991589974 mm/shmem.c: thp, ... |
2082 2083 |
* But if caller specified an address hint and we allocated area there * successfully, respect that as before. |
c01d5b300 shmem: get_unmapp... |
2084 |
*/ |
991589974 mm/shmem.c: thp, ... |
2085 |
if (uaddr == addr) |
c01d5b300 shmem: get_unmapp... |
2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 |
return addr; if (shmem_huge != SHMEM_HUGE_FORCE) { struct super_block *sb; if (file) { VM_BUG_ON(file->f_op != &shmem_file_operations); sb = file_inode(file)->i_sb; } else { /* * Called directly from mm/mmap.c, or drivers/char/mem.c * for "/dev/zero", to create a shared anonymous object. */ if (IS_ERR(shm_mnt)) return addr; sb = shm_mnt->mnt_sb; } |
3089bf614 shmem: fix tmpfs ... |
2103 |
if (SHMEM_SB(sb)->huge == SHMEM_HUGE_NEVER) |
c01d5b300 shmem: get_unmapp... |
2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 |
return addr; } offset = (pgoff << PAGE_SHIFT) & (HPAGE_PMD_SIZE-1); if (offset && offset + len < 2 * HPAGE_PMD_SIZE) return addr; if ((addr & (HPAGE_PMD_SIZE-1)) == offset) return addr; inflated_len = len + HPAGE_PMD_SIZE - PAGE_SIZE; if (inflated_len > TASK_SIZE) return addr; if (inflated_len < len) return addr; |
991589974 mm/shmem.c: thp, ... |
2118 |
inflated_addr = get_area(NULL, uaddr, inflated_len, 0, flags); |
c01d5b300 shmem: get_unmapp... |
2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 |
if (IS_ERR_VALUE(inflated_addr)) return addr; if (inflated_addr & ~PAGE_MASK) return addr; inflated_offset = inflated_addr & (HPAGE_PMD_SIZE-1); inflated_addr += offset - inflated_offset; if (inflated_offset > offset) inflated_addr += HPAGE_PMD_SIZE; if (inflated_addr > TASK_SIZE - len) return addr; return inflated_addr; } |
1da177e4c Linux-2.6.12-rc2 |
2133 |
#ifdef CONFIG_NUMA |
41ffe5d5c tmpfs: miscellane... |
2134 |
static int shmem_set_policy(struct vm_area_struct *vma, struct mempolicy *mpol) |
1da177e4c Linux-2.6.12-rc2 |
2135 |
{ |
496ad9aa8 new helper: file_... |
2136 |
struct inode *inode = file_inode(vma->vm_file); |
41ffe5d5c tmpfs: miscellane... |
2137 |
return mpol_set_shared_policy(&SHMEM_I(inode)->policy, vma, mpol); |
1da177e4c Linux-2.6.12-rc2 |
2138 |
} |
d8dc74f21 mm/shmem.c: make ... |
2139 2140 |
static struct mempolicy *shmem_get_policy(struct vm_area_struct *vma, unsigned long addr) |
1da177e4c Linux-2.6.12-rc2 |
2141 |
{ |
496ad9aa8 new helper: file_... |
2142 |
struct inode *inode = file_inode(vma->vm_file); |
41ffe5d5c tmpfs: miscellane... |
2143 |
pgoff_t index; |
1da177e4c Linux-2.6.12-rc2 |
2144 |
|
41ffe5d5c tmpfs: miscellane... |
2145 2146 |
index = ((addr - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff; return mpol_shared_policy_lookup(&SHMEM_I(inode)->policy, index); |
1da177e4c Linux-2.6.12-rc2 |
2147 2148 2149 2150 2151 |
} #endif int shmem_lock(struct file *file, int lock, struct user_struct *user) { |
496ad9aa8 new helper: file_... |
2152 |
struct inode *inode = file_inode(file); |
1da177e4c Linux-2.6.12-rc2 |
2153 2154 |
struct shmem_inode_info *info = SHMEM_I(inode); int retval = -ENOMEM; |
ea0dfeb42 shmem: fix possib... |
2155 2156 2157 2158 2159 |
/* * What serializes the accesses to info->flags? * ipc_lock_object() when called from shmctl_do_lock(), * no serialization needed when called from shm_destroy(). */ |
1da177e4c Linux-2.6.12-rc2 |
2160 2161 2162 2163 |
if (lock && !(info->flags & VM_LOCKED)) { if (!user_shm_lock(inode->i_size, user)) goto out_nomem; info->flags |= VM_LOCKED; |
89e004ea5 SHM_LOCKED pages ... |
2164 |
mapping_set_unevictable(file->f_mapping); |
1da177e4c Linux-2.6.12-rc2 |
2165 2166 2167 2168 |
} if (!lock && (info->flags & VM_LOCKED) && user) { user_shm_unlock(inode->i_size, user); info->flags &= ~VM_LOCKED; |
89e004ea5 SHM_LOCKED pages ... |
2169 |
mapping_clear_unevictable(file->f_mapping); |
1da177e4c Linux-2.6.12-rc2 |
2170 2171 |
} retval = 0; |
89e004ea5 SHM_LOCKED pages ... |
2172 |
|
1da177e4c Linux-2.6.12-rc2 |
2173 |
out_nomem: |
1da177e4c Linux-2.6.12-rc2 |
2174 2175 |
return retval; } |
9b83a6a85 [PATCH] mm/{,tiny... |
2176 |
static int shmem_mmap(struct file *file, struct vm_area_struct *vma) |
1da177e4c Linux-2.6.12-rc2 |
2177 |
{ |
ab3948f58 mm/memfd: add an ... |
2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 |
struct shmem_inode_info *info = SHMEM_I(file_inode(file)); if (info->seals & F_SEAL_FUTURE_WRITE) { /* * New PROT_WRITE and MAP_SHARED mmaps are not allowed when * "future write" seal active. */ if ((vma->vm_flags & VM_SHARED) && (vma->vm_flags & VM_WRITE)) return -EPERM; /* |
05d351102 mm, memfd: fix CO... |
2189 2190 2191 2192 2193 |
* Since an F_SEAL_FUTURE_WRITE sealed memfd can be mapped as * MAP_SHARED and read-only, take care to not allow mprotect to * revert protections on such mappings. Do this only for shared * mappings. For private mappings, don't need to mask * VM_MAYWRITE as we still want them to be COW-writable. |
ab3948f58 mm/memfd: add an ... |
2194 |
*/ |
05d351102 mm, memfd: fix CO... |
2195 2196 |
if (vma->vm_flags & VM_SHARED) vma->vm_flags &= ~(VM_MAYWRITE); |
ab3948f58 mm/memfd: add an ... |
2197 |
} |
51b0bff2f mm: Allow arm64 m... |
2198 2199 |
/* arm64 - allow memory tagging on RAM-based files */ vma->vm_flags |= VM_MTE_ALLOWED; |
1da177e4c Linux-2.6.12-rc2 |
2200 2201 |
file_accessed(file); vma->vm_ops = &shmem_vm_ops; |
396bcc529 mm: remove CONFIG... |
2202 |
if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE) && |
f3f0e1d21 khugepaged: add s... |
2203 2204 2205 2206 |
((vma->vm_start + ~HPAGE_PMD_MASK) & HPAGE_PMD_MASK) < (vma->vm_end & HPAGE_PMD_MASK)) { khugepaged_enter(vma, vma->vm_flags); } |
1da177e4c Linux-2.6.12-rc2 |
2207 2208 |
return 0; } |
454abafe9 ramfs: replace in... |
2209 |
static struct inode *shmem_get_inode(struct super_block *sb, const struct inode *dir, |
09208d150 shmem, ramfs: pro... |
2210 |
umode_t mode, dev_t dev, unsigned long flags) |
1da177e4c Linux-2.6.12-rc2 |
2211 2212 2213 2214 |
{ struct inode *inode; struct shmem_inode_info *info; struct shmem_sb_info *sbinfo = SHMEM_SB(sb); |
e809d5f0b tmpfs: per-superb... |
2215 |
ino_t ino; |
1da177e4c Linux-2.6.12-rc2 |
2216 |
|
e809d5f0b tmpfs: per-superb... |
2217 |
if (shmem_reserve_inode(sb, &ino)) |
5b04c6890 shmem: factor out... |
2218 |
return NULL; |
1da177e4c Linux-2.6.12-rc2 |
2219 2220 2221 |
inode = new_inode(sb); if (inode) { |
e809d5f0b tmpfs: per-superb... |
2222 |
inode->i_ino = ino; |
454abafe9 ramfs: replace in... |
2223 |
inode_init_owner(inode, dir, mode); |
1da177e4c Linux-2.6.12-rc2 |
2224 |
inode->i_blocks = 0; |
078cd8279 fs: Replace CURRE... |
2225 |
inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); |
46c9a946d shmem: use monoto... |
2226 |
inode->i_generation = prandom_u32(); |
1da177e4c Linux-2.6.12-rc2 |
2227 2228 2229 |
info = SHMEM_I(inode); memset(info, 0, (char *)inode - (char *)info); spin_lock_init(&info->lock); |
af53d3e9e mm: swapoff: shme... |
2230 |
atomic_set(&info->stop_eviction, 0); |
40e041a2c shm: add sealing API |
2231 |
info->seals = F_SEAL_SEAL; |
0b0a0806b shmem: fix shared... |
2232 |
info->flags = flags & VM_NORESERVE; |
779750d20 shmem: split huge... |
2233 |
INIT_LIST_HEAD(&info->shrinklist); |
1da177e4c Linux-2.6.12-rc2 |
2234 |
INIT_LIST_HEAD(&info->swaplist); |
38f386574 xattr: extract si... |
2235 |
simple_xattrs_init(&info->xattrs); |
72c04902d Get "no acls for ... |
2236 |
cache_no_acl(inode); |
1da177e4c Linux-2.6.12-rc2 |
2237 2238 2239 |
switch (mode & S_IFMT) { default: |
39f0247d3 [PATCH] Access Co... |
2240 |
inode->i_op = &shmem_special_inode_operations; |
1da177e4c Linux-2.6.12-rc2 |
2241 2242 2243 |
init_special_inode(inode, mode, dev); break; case S_IFREG: |
14fcc23fd tmpfs: fix kernel... |
2244 |
inode->i_mapping->a_ops = &shmem_aops; |
1da177e4c Linux-2.6.12-rc2 |
2245 2246 |
inode->i_op = &shmem_inode_operations; inode->i_fop = &shmem_file_operations; |
71fe804b6 mempolicy: use st... |
2247 2248 |
mpol_shared_policy_init(&info->policy, shmem_get_sbmpol(sbinfo)); |
1da177e4c Linux-2.6.12-rc2 |
2249 2250 |
break; case S_IFDIR: |
d8c76e6f4 [PATCH] r/o bind ... |
2251 |
inc_nlink(inode); |
1da177e4c Linux-2.6.12-rc2 |
2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 |
/* Some things misbehave if size == 0 on a directory */ inode->i_size = 2 * BOGO_DIRENT_SIZE; inode->i_op = &shmem_dir_inode_operations; inode->i_fop = &simple_dir_operations; break; case S_IFLNK: /* * Must not load anything in the rbtree, * mpol_free_shared_policy will not be called. */ |
71fe804b6 mempolicy: use st... |
2262 |
mpol_shared_policy_init(&info->policy, NULL); |
1da177e4c Linux-2.6.12-rc2 |
2263 2264 |
break; } |
b45d71fb8 mm: shmem.c: Corr... |
2265 2266 |
lockdep_annotate_inode_mutex_key(inode); |
5b04c6890 shmem: factor out... |
2267 2268 |
} else shmem_free_inode(sb); |
1da177e4c Linux-2.6.12-rc2 |
2269 2270 |
return inode; } |
0cd6144aa mm + fs: prepare ... |
2271 2272 |
bool shmem_mapping(struct address_space *mapping) { |
f8005451d tmpfs: change shm... |
2273 |
return mapping->a_ops == &shmem_aops; |
0cd6144aa mm + fs: prepare ... |
2274 |
} |
8d1039634 userfaultfd: shme... |
2275 2276 2277 2278 2279 2280 2281 |
static int shmem_mfill_atomic_pte(struct mm_struct *dst_mm, pmd_t *dst_pmd, struct vm_area_struct *dst_vma, unsigned long dst_addr, unsigned long src_addr, bool zeropage, struct page **pagep) |
4c27fe4c4 userfaultfd: shme... |
2282 2283 2284 |
{ struct inode *inode = file_inode(dst_vma->vm_file); struct shmem_inode_info *info = SHMEM_I(inode); |
4c27fe4c4 userfaultfd: shme... |
2285 2286 2287 |
struct address_space *mapping = inode->i_mapping; gfp_t gfp = mapping_gfp_mask(mapping); pgoff_t pgoff = linear_page_index(dst_vma, dst_addr); |
4c27fe4c4 userfaultfd: shme... |
2288 2289 2290 2291 2292 |
spinlock_t *ptl; void *page_kaddr; struct page *page; pte_t _dst_pte, *dst_pte; int ret; |
e2a50c1f6 userfaultfd: shme... |
2293 |
pgoff_t offset, max_off; |
4c27fe4c4 userfaultfd: shme... |
2294 |
|
cb658a453 userfaultfd: shme... |
2295 |
ret = -ENOMEM; |
0f0796945 shmem: introduce ... |
2296 |
if (!shmem_inode_acct_block(inode, 1)) |
cb658a453 userfaultfd: shme... |
2297 |
goto out; |
4c27fe4c4 userfaultfd: shme... |
2298 |
|
cb658a453 userfaultfd: shme... |
2299 |
if (!*pagep) { |
4c27fe4c4 userfaultfd: shme... |
2300 2301 |
page = shmem_alloc_page(gfp, info, pgoff); if (!page) |
0f0796945 shmem: introduce ... |
2302 |
goto out_unacct_blocks; |
4c27fe4c4 userfaultfd: shme... |
2303 |
|
8d1039634 userfaultfd: shme... |
2304 2305 2306 2307 2308 2309 |
if (!zeropage) { /* mcopy_atomic */ page_kaddr = kmap_atomic(page); ret = copy_from_user(page_kaddr, (const void __user *)src_addr, PAGE_SIZE); kunmap_atomic(page_kaddr); |
c1e8d7c6a mmap locking API:... |
2310 |
/* fallback to copy_from_user outside mmap_lock */ |
8d1039634 userfaultfd: shme... |
2311 2312 2313 2314 |
if (unlikely(ret)) { *pagep = page; shmem_inode_unacct_blocks(inode, 1); /* don't free the page */ |
9e368259a userfaultfd: use ... |
2315 |
return -ENOENT; |
8d1039634 userfaultfd: shme... |
2316 2317 2318 |
} } else { /* mfill_zeropage_atomic */ clear_highpage(page); |
4c27fe4c4 userfaultfd: shme... |
2319 2320 2321 2322 2323 |
} } else { page = *pagep; *pagep = NULL; } |
9cc90c664 userfaultfd: shme... |
2324 2325 2326 |
VM_BUG_ON(PageLocked(page) || PageSwapBacked(page)); __SetPageLocked(page); __SetPageSwapBacked(page); |
a425d3584 userfaultfd: shme... |
2327 |
__SetPageUptodate(page); |
9cc90c664 userfaultfd: shme... |
2328 |
|
e2a50c1f6 userfaultfd: shme... |
2329 2330 2331 2332 2333 |
ret = -EFAULT; offset = linear_page_index(dst_vma, dst_addr); max_off = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE); if (unlikely(offset >= max_off)) goto out_release; |
552446a41 shmem: Convert sh... |
2334 |
ret = shmem_add_to_page_cache(page, mapping, pgoff, NULL, |
3fea5a499 mm: memcontrol: c... |
2335 |
gfp & GFP_RECLAIM_MASK, dst_mm); |
4c27fe4c4 userfaultfd: shme... |
2336 |
if (ret) |
3fea5a499 mm: memcontrol: c... |
2337 |
goto out_release; |
4c27fe4c4 userfaultfd: shme... |
2338 2339 2340 2341 |
_dst_pte = mk_pte(page, dst_vma->vm_page_prot); if (dst_vma->vm_flags & VM_WRITE) _dst_pte = pte_mkwrite(pte_mkdirty(_dst_pte)); |
dcf7fe9d8 userfaultfd: shme... |
2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 |
else { /* * We don't set the pte dirty if the vma has no * VM_WRITE permission, so mark the page dirty or it * could be freed from under us. We could do it * unconditionally before unlock_page(), but doing it * only if VM_WRITE is not set is faster. */ set_page_dirty(page); } |
4c27fe4c4 userfaultfd: shme... |
2352 |
|
4c27fe4c4 userfaultfd: shme... |
2353 |
dst_pte = pte_offset_map_lock(dst_mm, dst_pmd, dst_addr, &ptl); |
e2a50c1f6 userfaultfd: shme... |
2354 2355 2356 2357 |
ret = -EFAULT; max_off = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE); if (unlikely(offset >= max_off)) |
3fea5a499 mm: memcontrol: c... |
2358 |
goto out_release_unlock; |
e2a50c1f6 userfaultfd: shme... |
2359 2360 |
ret = -EEXIST; |
4c27fe4c4 userfaultfd: shme... |
2361 |
if (!pte_none(*dst_pte)) |
3fea5a499 mm: memcontrol: c... |
2362 |
goto out_release_unlock; |
4c27fe4c4 userfaultfd: shme... |
2363 |
|
6058eaec8 mm: fold and remo... |
2364 |
lru_cache_add(page); |
4c27fe4c4 userfaultfd: shme... |
2365 |
|
94b7cc01d mm: shmem: disabl... |
2366 |
spin_lock_irq(&info->lock); |
4c27fe4c4 userfaultfd: shme... |
2367 2368 2369 |
info->alloced++; inode->i_blocks += BLOCKS_PER_PAGE; shmem_recalc_inode(inode); |
94b7cc01d mm: shmem: disabl... |
2370 |
spin_unlock_irq(&info->lock); |
4c27fe4c4 userfaultfd: shme... |
2371 2372 2373 2374 2375 2376 2377 |
inc_mm_counter(dst_mm, mm_counter_file(page)); page_add_file_rmap(page, false); set_pte_at(dst_mm, dst_addr, dst_pte, _dst_pte); /* No need to invalidate - it was non-present before */ update_mmu_cache(dst_vma, dst_addr, dst_pte); |
4c27fe4c4 userfaultfd: shme... |
2378 |
pte_unmap_unlock(dst_pte, ptl); |
e2a50c1f6 userfaultfd: shme... |
2379 |
unlock_page(page); |
4c27fe4c4 userfaultfd: shme... |
2380 2381 2382 |
ret = 0; out: return ret; |
3fea5a499 mm: memcontrol: c... |
2383 |
out_release_unlock: |
4c27fe4c4 userfaultfd: shme... |
2384 |
pte_unmap_unlock(dst_pte, ptl); |
dcf7fe9d8 userfaultfd: shme... |
2385 |
ClearPageDirty(page); |
e2a50c1f6 userfaultfd: shme... |
2386 |
delete_from_page_cache(page); |
4c27fe4c4 userfaultfd: shme... |
2387 |
out_release: |
9cc90c664 userfaultfd: shme... |
2388 |
unlock_page(page); |
4c27fe4c4 userfaultfd: shme... |
2389 |
put_page(page); |
4c27fe4c4 userfaultfd: shme... |
2390 |
out_unacct_blocks: |
0f0796945 shmem: introduce ... |
2391 |
shmem_inode_unacct_blocks(inode, 1); |
4c27fe4c4 userfaultfd: shme... |
2392 2393 |
goto out; } |
8d1039634 userfaultfd: shme... |
2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 |
int shmem_mcopy_atomic_pte(struct mm_struct *dst_mm, pmd_t *dst_pmd, struct vm_area_struct *dst_vma, unsigned long dst_addr, unsigned long src_addr, struct page **pagep) { return shmem_mfill_atomic_pte(dst_mm, dst_pmd, dst_vma, dst_addr, src_addr, false, pagep); } int shmem_mfill_zeropage_pte(struct mm_struct *dst_mm, pmd_t *dst_pmd, struct vm_area_struct *dst_vma, unsigned long dst_addr) { struct page *page = NULL; return shmem_mfill_atomic_pte(dst_mm, dst_pmd, dst_vma, dst_addr, 0, true, &page); } |
1da177e4c Linux-2.6.12-rc2 |
2415 |
#ifdef CONFIG_TMPFS |
92e1d5be9 [PATCH] mark stru... |
2416 |
static const struct inode_operations shmem_symlink_inode_operations; |
69f07ec93 tmpfs: use kmemdu... |
2417 |
static const struct inode_operations shmem_short_symlink_operations; |
1da177e4c Linux-2.6.12-rc2 |
2418 |
|
6d9d88d07 tmpfs: security x... |
2419 2420 2421 2422 2423 |
#ifdef CONFIG_TMPFS_XATTR static int shmem_initxattrs(struct inode *, const struct xattr *, void *); #else #define shmem_initxattrs NULL #endif |
1da177e4c Linux-2.6.12-rc2 |
2424 |
static int |
800d15a53 implement simple ... |
2425 2426 2427 |
shmem_write_begin(struct file *file, struct address_space *mapping, loff_t pos, unsigned len, unsigned flags, struct page **pagep, void **fsdata) |
1da177e4c Linux-2.6.12-rc2 |
2428 |
{ |
800d15a53 implement simple ... |
2429 |
struct inode *inode = mapping->host; |
40e041a2c shm: add sealing API |
2430 |
struct shmem_inode_info *info = SHMEM_I(inode); |
09cbfeaf1 mm, fs: get rid o... |
2431 |
pgoff_t index = pos >> PAGE_SHIFT; |
40e041a2c shm: add sealing API |
2432 2433 |
/* i_mutex is held by caller */ |
ab3948f58 mm/memfd: add an ... |
2434 2435 2436 |
if (unlikely(info->seals & (F_SEAL_GROW | F_SEAL_WRITE | F_SEAL_FUTURE_WRITE))) { if (info->seals & (F_SEAL_WRITE | F_SEAL_FUTURE_WRITE)) |
40e041a2c shm: add sealing API |
2437 2438 2439 2440 |
return -EPERM; if ((info->seals & F_SEAL_GROW) && pos + len > inode->i_size) return -EPERM; } |
9e18eb293 tmpfs: mem_cgroup... |
2441 |
return shmem_getpage(inode, index, pagep, SGP_WRITE); |
800d15a53 implement simple ... |
2442 2443 2444 2445 2446 2447 2448 2449 |
} static int shmem_write_end(struct file *file, struct address_space *mapping, loff_t pos, unsigned len, unsigned copied, struct page *page, void *fsdata) { struct inode *inode = mapping->host; |
d3602444e shmem_getpage ret... |
2450 2451 |
if (pos + copied > inode->i_size) i_size_write(inode, pos + copied); |
ec9516fbc tmpfs: optimize c... |
2452 |
if (!PageUptodate(page)) { |
800d8c63b shmem: add huge p... |
2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 |
struct page *head = compound_head(page); if (PageTransCompound(page)) { int i; for (i = 0; i < HPAGE_PMD_NR; i++) { if (head + i == page) continue; clear_highpage(head + i); flush_dcache_page(head + i); } } |
09cbfeaf1 mm, fs: get rid o... |
2464 2465 |
if (copied < PAGE_SIZE) { unsigned from = pos & (PAGE_SIZE - 1); |
ec9516fbc tmpfs: optimize c... |
2466 |
zero_user_segments(page, 0, from, |
09cbfeaf1 mm, fs: get rid o... |
2467 |
from + copied, PAGE_SIZE); |
ec9516fbc tmpfs: optimize c... |
2468 |
} |
800d8c63b shmem: add huge p... |
2469 |
SetPageUptodate(head); |
ec9516fbc tmpfs: optimize c... |
2470 |
} |
800d15a53 implement simple ... |
2471 |
set_page_dirty(page); |
6746aff74 HWPOISON: shmem: ... |
2472 |
unlock_page(page); |
09cbfeaf1 mm, fs: get rid o... |
2473 |
put_page(page); |
800d15a53 implement simple ... |
2474 |
|
800d15a53 implement simple ... |
2475 |
return copied; |
1da177e4c Linux-2.6.12-rc2 |
2476 |
} |
2ba5bbed0 shmem: switch to ... |
2477 |
static ssize_t shmem_file_read_iter(struct kiocb *iocb, struct iov_iter *to) |
1da177e4c Linux-2.6.12-rc2 |
2478 |
{ |
6e58e79db introduce copy_pa... |
2479 2480 |
struct file *file = iocb->ki_filp; struct inode *inode = file_inode(file); |
1da177e4c Linux-2.6.12-rc2 |
2481 |
struct address_space *mapping = inode->i_mapping; |
41ffe5d5c tmpfs: miscellane... |
2482 2483 |
pgoff_t index; unsigned long offset; |
a0ee5ec52 tmpfs: allocate o... |
2484 |
enum sgp_type sgp = SGP_READ; |
f7c1d0742 mm: Initialize er... |
2485 |
int error = 0; |
cb66a7a1f kill generic_segm... |
2486 |
ssize_t retval = 0; |
6e58e79db introduce copy_pa... |
2487 |
loff_t *ppos = &iocb->ki_pos; |
a0ee5ec52 tmpfs: allocate o... |
2488 2489 2490 2491 2492 2493 |
/* * Might this read be for a stacking filesystem? Then when reading * holes of a sparse file, we actually need to allocate those pages, * and even mark them dirty, so it cannot exceed the max_blocks limit. */ |
777eda2c5 new helper: iter_... |
2494 |
if (!iter_is_iovec(to)) |
75edd345e tmpfs: preliminar... |
2495 |
sgp = SGP_CACHE; |
1da177e4c Linux-2.6.12-rc2 |
2496 |
|
09cbfeaf1 mm, fs: get rid o... |
2497 2498 |
index = *ppos >> PAGE_SHIFT; offset = *ppos & ~PAGE_MASK; |
1da177e4c Linux-2.6.12-rc2 |
2499 2500 2501 |
for (;;) { struct page *page = NULL; |
41ffe5d5c tmpfs: miscellane... |
2502 2503 |
pgoff_t end_index; unsigned long nr, ret; |
1da177e4c Linux-2.6.12-rc2 |
2504 |
loff_t i_size = i_size_read(inode); |
09cbfeaf1 mm, fs: get rid o... |
2505 |
end_index = i_size >> PAGE_SHIFT; |
1da177e4c Linux-2.6.12-rc2 |
2506 2507 2508 |
if (index > end_index) break; if (index == end_index) { |
09cbfeaf1 mm, fs: get rid o... |
2509 |
nr = i_size & ~PAGE_MASK; |
1da177e4c Linux-2.6.12-rc2 |
2510 2511 2512 |
if (nr <= offset) break; } |
9e18eb293 tmpfs: mem_cgroup... |
2513 |
error = shmem_getpage(inode, index, &page, sgp); |
6e58e79db introduce copy_pa... |
2514 2515 2516 |
if (error) { if (error == -EINVAL) error = 0; |
1da177e4c Linux-2.6.12-rc2 |
2517 2518 |
break; } |
75edd345e tmpfs: preliminar... |
2519 2520 2521 |
if (page) { if (sgp == SGP_CACHE) set_page_dirty(page); |
d3602444e shmem_getpage ret... |
2522 |
unlock_page(page); |
75edd345e tmpfs: preliminar... |
2523 |
} |
1da177e4c Linux-2.6.12-rc2 |
2524 2525 2526 |
/* * We must evaluate after, since reads (unlike writes) |
1b1dcc1b5 [PATCH] mutex sub... |
2527 |
* are called without i_mutex protection against truncate |
1da177e4c Linux-2.6.12-rc2 |
2528 |
*/ |
09cbfeaf1 mm, fs: get rid o... |
2529 |
nr = PAGE_SIZE; |
1da177e4c Linux-2.6.12-rc2 |
2530 |
i_size = i_size_read(inode); |
09cbfeaf1 mm, fs: get rid o... |
2531 |
end_index = i_size >> PAGE_SHIFT; |
1da177e4c Linux-2.6.12-rc2 |
2532 |
if (index == end_index) { |
09cbfeaf1 mm, fs: get rid o... |
2533 |
nr = i_size & ~PAGE_MASK; |
1da177e4c Linux-2.6.12-rc2 |
2534 2535 |
if (nr <= offset) { if (page) |
09cbfeaf1 mm, fs: get rid o... |
2536 |
put_page(page); |
1da177e4c Linux-2.6.12-rc2 |
2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 |
break; } } nr -= offset; if (page) { /* * If users can be writing to this page using arbitrary * virtual addresses, take care about potential aliasing * before reading the page on the kernel side. */ if (mapping_writably_mapped(mapping)) flush_dcache_page(page); /* * Mark the page accessed if we read the beginning. */ if (!offset) mark_page_accessed(page); |
b5810039a [PATCH] core remo... |
2555 |
} else { |
1da177e4c Linux-2.6.12-rc2 |
2556 |
page = ZERO_PAGE(0); |
09cbfeaf1 mm, fs: get rid o... |
2557 |
get_page(page); |
b5810039a [PATCH] core remo... |
2558 |
} |
1da177e4c Linux-2.6.12-rc2 |
2559 2560 2561 2562 |
/* * Ok, we have the page, and it's up-to-date, so * now we can copy it to user space... |
1da177e4c Linux-2.6.12-rc2 |
2563 |
*/ |
2ba5bbed0 shmem: switch to ... |
2564 |
ret = copy_page_to_iter(page, offset, nr, to); |
6e58e79db introduce copy_pa... |
2565 |
retval += ret; |
1da177e4c Linux-2.6.12-rc2 |
2566 |
offset += ret; |
09cbfeaf1 mm, fs: get rid o... |
2567 2568 |
index += offset >> PAGE_SHIFT; offset &= ~PAGE_MASK; |
1da177e4c Linux-2.6.12-rc2 |
2569 |
|
09cbfeaf1 mm, fs: get rid o... |
2570 |
put_page(page); |
2ba5bbed0 shmem: switch to ... |
2571 |
if (!iov_iter_count(to)) |
1da177e4c Linux-2.6.12-rc2 |
2572 |
break; |
6e58e79db introduce copy_pa... |
2573 2574 2575 2576 |
if (ret < nr) { error = -EFAULT; break; } |
1da177e4c Linux-2.6.12-rc2 |
2577 2578 |
cond_resched(); } |
09cbfeaf1 mm, fs: get rid o... |
2579 |
*ppos = ((loff_t) index << PAGE_SHIFT) + offset; |
6e58e79db introduce copy_pa... |
2580 2581 |
file_accessed(file); return retval ? retval : error; |
1da177e4c Linux-2.6.12-rc2 |
2582 |
} |
220f2ac91 tmpfs: support SE... |
2583 |
/* |
7f4446eef shmem: Comment fi... |
2584 |
* llseek SEEK_DATA or SEEK_HOLE through the page cache. |
220f2ac91 tmpfs: support SE... |
2585 2586 |
*/ static pgoff_t shmem_seek_hole_data(struct address_space *mapping, |
965c8e59c lseek: the "whenc... |
2587 |
pgoff_t index, pgoff_t end, int whence) |
220f2ac91 tmpfs: support SE... |
2588 2589 2590 2591 2592 2593 |
{ struct page *page; struct pagevec pvec; pgoff_t indices[PAGEVEC_SIZE]; bool done = false; int i; |
866798201 mm, pagevec: remo... |
2594 |
pagevec_init(&pvec); |
220f2ac91 tmpfs: support SE... |
2595 2596 |
pvec.nr = 1; /* start small: we may be there already */ while (!done) { |
0cd6144aa mm + fs: prepare ... |
2597 |
pvec.nr = find_get_entries(mapping, index, |
220f2ac91 tmpfs: support SE... |
2598 2599 |
pvec.nr, pvec.pages, indices); if (!pvec.nr) { |
965c8e59c lseek: the "whenc... |
2600 |
if (whence == SEEK_DATA) |
220f2ac91 tmpfs: support SE... |
2601 2602 2603 2604 2605 |
index = end; break; } for (i = 0; i < pvec.nr; i++, index++) { if (index < indices[i]) { |
965c8e59c lseek: the "whenc... |
2606 |
if (whence == SEEK_HOLE) { |
220f2ac91 tmpfs: support SE... |
2607 2608 2609 2610 2611 2612 |
done = true; break; } index = indices[i]; } page = pvec.pages[i]; |
3159f943a xarray: Replace e... |
2613 |
if (page && !xa_is_value(page)) { |
220f2ac91 tmpfs: support SE... |
2614 2615 2616 2617 |
if (!PageUptodate(page)) page = NULL; } if (index >= end || |
965c8e59c lseek: the "whenc... |
2618 2619 |
(page && whence == SEEK_DATA) || (!page && whence == SEEK_HOLE)) { |
220f2ac91 tmpfs: support SE... |
2620 2621 2622 2623 |
done = true; break; } } |
0cd6144aa mm + fs: prepare ... |
2624 |
pagevec_remove_exceptionals(&pvec); |
220f2ac91 tmpfs: support SE... |
2625 2626 2627 2628 2629 2630 |
pagevec_release(&pvec); pvec.nr = PAGEVEC_SIZE; cond_resched(); } return index; } |
965c8e59c lseek: the "whenc... |
2631 |
static loff_t shmem_file_llseek(struct file *file, loff_t offset, int whence) |
220f2ac91 tmpfs: support SE... |
2632 2633 2634 2635 2636 |
{ struct address_space *mapping = file->f_mapping; struct inode *inode = mapping->host; pgoff_t start, end; loff_t new_offset; |
965c8e59c lseek: the "whenc... |
2637 2638 |
if (whence != SEEK_DATA && whence != SEEK_HOLE) return generic_file_llseek_size(file, offset, whence, |
220f2ac91 tmpfs: support SE... |
2639 |
MAX_LFS_FILESIZE, i_size_read(inode)); |
5955102c9 wrappers for ->i_... |
2640 |
inode_lock(inode); |
220f2ac91 tmpfs: support SE... |
2641 |
/* We're holding i_mutex so we can access i_size directly */ |
1a4136469 tmpfs: make lseek... |
2642 |
if (offset < 0 || offset >= inode->i_size) |
220f2ac91 tmpfs: support SE... |
2643 2644 |
offset = -ENXIO; else { |
09cbfeaf1 mm, fs: get rid o... |
2645 2646 |
start = offset >> PAGE_SHIFT; end = (inode->i_size + PAGE_SIZE - 1) >> PAGE_SHIFT; |
965c8e59c lseek: the "whenc... |
2647 |
new_offset = shmem_seek_hole_data(mapping, start, end, whence); |
09cbfeaf1 mm, fs: get rid o... |
2648 |
new_offset <<= PAGE_SHIFT; |
220f2ac91 tmpfs: support SE... |
2649 2650 2651 |
if (new_offset > offset) { if (new_offset < inode->i_size) offset = new_offset; |
965c8e59c lseek: the "whenc... |
2652 |
else if (whence == SEEK_DATA) |
220f2ac91 tmpfs: support SE... |
2653 2654 2655 2656 2657 |
offset = -ENXIO; else offset = inode->i_size; } } |
387aae6fd tmpfs: fix SEEK_D... |
2658 2659 |
if (offset >= 0) offset = vfs_setpos(file, offset, MAX_LFS_FILESIZE); |
5955102c9 wrappers for ->i_... |
2660 |
inode_unlock(inode); |
220f2ac91 tmpfs: support SE... |
2661 2662 |
return offset; } |
83e4fa9c1 tmpfs: support fa... |
2663 2664 2665 |
static long shmem_fallocate(struct file *file, int mode, loff_t offset, loff_t len) { |
496ad9aa8 new helper: file_... |
2666 |
struct inode *inode = file_inode(file); |
e2d12e22c tmpfs: support fa... |
2667 |
struct shmem_sb_info *sbinfo = SHMEM_SB(inode->i_sb); |
40e041a2c shm: add sealing API |
2668 |
struct shmem_inode_info *info = SHMEM_I(inode); |
1aac14003 tmpfs: quit when ... |
2669 |
struct shmem_falloc shmem_falloc; |
e2d12e22c tmpfs: support fa... |
2670 2671 |
pgoff_t start, index, end; int error; |
83e4fa9c1 tmpfs: support fa... |
2672 |
|
13ace4d0d tmpfs: ZERO_RANGE... |
2673 2674 |
if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE)) return -EOPNOTSUPP; |
5955102c9 wrappers for ->i_... |
2675 |
inode_lock(inode); |
83e4fa9c1 tmpfs: support fa... |
2676 2677 2678 2679 2680 |
if (mode & FALLOC_FL_PUNCH_HOLE) { struct address_space *mapping = file->f_mapping; loff_t unmap_start = round_up(offset, PAGE_SIZE); loff_t unmap_end = round_down(offset + len, PAGE_SIZE) - 1; |
8e205f779 shmem: fix faulti... |
2681 |
DECLARE_WAIT_QUEUE_HEAD_ONSTACK(shmem_falloc_waitq); |
83e4fa9c1 tmpfs: support fa... |
2682 |
|
40e041a2c shm: add sealing API |
2683 |
/* protected by i_mutex */ |
ab3948f58 mm/memfd: add an ... |
2684 |
if (info->seals & (F_SEAL_WRITE | F_SEAL_FUTURE_WRITE)) { |
40e041a2c shm: add sealing API |
2685 2686 2687 |
error = -EPERM; goto out; } |
8e205f779 shmem: fix faulti... |
2688 |
shmem_falloc.waitq = &shmem_falloc_waitq; |
aa71ecd8d mm/shmem.c: cast ... |
2689 |
shmem_falloc.start = (u64)unmap_start >> PAGE_SHIFT; |
f00cdc6df shmem: fix faulti... |
2690 2691 2692 2693 |
shmem_falloc.next = (unmap_end + 1) >> PAGE_SHIFT; spin_lock(&inode->i_lock); inode->i_private = &shmem_falloc; spin_unlock(&inode->i_lock); |
83e4fa9c1 tmpfs: support fa... |
2694 2695 2696 2697 2698 |
if ((u64)unmap_end > (u64)unmap_start) unmap_mapping_range(mapping, unmap_start, 1 + unmap_end - unmap_start, 0); shmem_truncate_range(inode, offset, offset + len - 1); /* No need to unmap again: hole-punching leaves COWed pages */ |
8e205f779 shmem: fix faulti... |
2699 2700 2701 2702 |
spin_lock(&inode->i_lock); inode->i_private = NULL; wake_up_all(&shmem_falloc_waitq); |
2055da973 sched/wait: Disam... |
2703 |
WARN_ON_ONCE(!list_empty(&shmem_falloc_waitq.head)); |
8e205f779 shmem: fix faulti... |
2704 |
spin_unlock(&inode->i_lock); |
83e4fa9c1 tmpfs: support fa... |
2705 |
error = 0; |
8e205f779 shmem: fix faulti... |
2706 |
goto out; |
e2d12e22c tmpfs: support fa... |
2707 2708 2709 2710 2711 2712 |
} /* We need to check rlimit even when FALLOC_FL_KEEP_SIZE */ error = inode_newsize_ok(inode, offset + len); if (error) goto out; |
40e041a2c shm: add sealing API |
2713 2714 2715 2716 |
if ((info->seals & F_SEAL_GROW) && offset + len > inode->i_size) { error = -EPERM; goto out; } |
09cbfeaf1 mm, fs: get rid o... |
2717 2718 |
start = offset >> PAGE_SHIFT; end = (offset + len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
e2d12e22c tmpfs: support fa... |
2719 2720 2721 2722 |
/* Try to avoid a swapstorm if len is impossible to satisfy */ if (sbinfo->max_blocks && end - start > sbinfo->max_blocks) { error = -ENOSPC; goto out; |
83e4fa9c1 tmpfs: support fa... |
2723 |
} |
8e205f779 shmem: fix faulti... |
2724 |
shmem_falloc.waitq = NULL; |
1aac14003 tmpfs: quit when ... |
2725 2726 2727 2728 2729 2730 2731 |
shmem_falloc.start = start; shmem_falloc.next = start; shmem_falloc.nr_falloced = 0; shmem_falloc.nr_unswapped = 0; spin_lock(&inode->i_lock); inode->i_private = &shmem_falloc; spin_unlock(&inode->i_lock); |
e2d12e22c tmpfs: support fa... |
2732 2733 2734 2735 2736 2737 2738 2739 2740 |
for (index = start; index < end; index++) { struct page *page; /* * Good, the fallocate(2) manpage permits EINTR: we may have * been interrupted because we are using up too much memory. */ if (signal_pending(current)) error = -EINTR; |
1aac14003 tmpfs: quit when ... |
2741 2742 |
else if (shmem_falloc.nr_unswapped > shmem_falloc.nr_falloced) error = -ENOMEM; |
e2d12e22c tmpfs: support fa... |
2743 |
else |
9e18eb293 tmpfs: mem_cgroup... |
2744 |
error = shmem_getpage(inode, index, &page, SGP_FALLOC); |
e2d12e22c tmpfs: support fa... |
2745 |
if (error) { |
1635f6a74 tmpfs: undo fallo... |
2746 |
/* Remove the !PageUptodate pages we added */ |
7f5565670 tmpfs: fix regres... |
2747 2748 2749 2750 2751 |
if (index > start) { shmem_undo_range(inode, (loff_t)start << PAGE_SHIFT, ((loff_t)index << PAGE_SHIFT) - 1, true); } |
1aac14003 tmpfs: quit when ... |
2752 |
goto undone; |
e2d12e22c tmpfs: support fa... |
2753 |
} |
e2d12e22c tmpfs: support fa... |
2754 |
/* |
1aac14003 tmpfs: quit when ... |
2755 2756 2757 2758 2759 2760 2761 2762 |
* Inform shmem_writepage() how far we have reached. * No need for lock or barrier: we have the page lock. */ shmem_falloc.next++; if (!PageUptodate(page)) shmem_falloc.nr_falloced++; /* |
1635f6a74 tmpfs: undo fallo... |
2763 2764 2765 |
* If !PageUptodate, leave it that way so that freeable pages * can be recognized if we need to rollback on error later. * But set_page_dirty so that memory pressure will swap rather |
e2d12e22c tmpfs: support fa... |
2766 2767 2768 2769 2770 |
* than free the pages we are allocating (and SGP_CACHE pages * might still be clean: we now need to mark those dirty too). */ set_page_dirty(page); unlock_page(page); |
09cbfeaf1 mm, fs: get rid o... |
2771 |
put_page(page); |
e2d12e22c tmpfs: support fa... |
2772 2773 2774 2775 2776 |
cond_resched(); } if (!(mode & FALLOC_FL_KEEP_SIZE) && offset + len > inode->i_size) i_size_write(inode, offset + len); |
078cd8279 fs: Replace CURRE... |
2777 |
inode->i_ctime = current_time(inode); |
1aac14003 tmpfs: quit when ... |
2778 2779 2780 2781 |
undone: spin_lock(&inode->i_lock); inode->i_private = NULL; spin_unlock(&inode->i_lock); |
e2d12e22c tmpfs: support fa... |
2782 |
out: |
5955102c9 wrappers for ->i_... |
2783 |
inode_unlock(inode); |
83e4fa9c1 tmpfs: support fa... |
2784 2785 |
return error; } |
726c33422 [PATCH] VFS: Perm... |
2786 |
static int shmem_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4c Linux-2.6.12-rc2 |
2787 |
{ |
726c33422 [PATCH] VFS: Perm... |
2788 |
struct shmem_sb_info *sbinfo = SHMEM_SB(dentry->d_sb); |
1da177e4c Linux-2.6.12-rc2 |
2789 2790 |
buf->f_type = TMPFS_MAGIC; |
09cbfeaf1 mm, fs: get rid o... |
2791 |
buf->f_bsize = PAGE_SIZE; |
1da177e4c Linux-2.6.12-rc2 |
2792 |
buf->f_namelen = NAME_MAX; |
0edd73b33 [PATCH] shmem: re... |
2793 |
if (sbinfo->max_blocks) { |
1da177e4c Linux-2.6.12-rc2 |
2794 |
buf->f_blocks = sbinfo->max_blocks; |
41ffe5d5c tmpfs: miscellane... |
2795 2796 2797 |
buf->f_bavail = buf->f_bfree = sbinfo->max_blocks - percpu_counter_sum(&sbinfo->used_blocks); |
0edd73b33 [PATCH] shmem: re... |
2798 2799 |
} if (sbinfo->max_inodes) { |
1da177e4c Linux-2.6.12-rc2 |
2800 2801 |
buf->f_files = sbinfo->max_inodes; buf->f_ffree = sbinfo->free_inodes; |
1da177e4c Linux-2.6.12-rc2 |
2802 2803 2804 2805 2806 2807 2808 2809 2810 |
} /* else leave those fields 0 like simple_statfs */ return 0; } /* * File creation. Allocate an inode, and we're done.. */ static int |
1a67aafb5 switch ->mknod() ... |
2811 |
shmem_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev) |
1da177e4c Linux-2.6.12-rc2 |
2812 |
{ |
0b0a0806b shmem: fix shared... |
2813 |
struct inode *inode; |
1da177e4c Linux-2.6.12-rc2 |
2814 |
int error = -ENOSPC; |
454abafe9 ramfs: replace in... |
2815 |
inode = shmem_get_inode(dir->i_sb, dir, mode, dev, VM_NORESERVE); |
1da177e4c Linux-2.6.12-rc2 |
2816 |
if (inode) { |
feda821e7 fs: remove generi... |
2817 2818 2819 |
error = simple_acl_create(dir, inode); if (error) goto out_iput; |
2a7dba391 fs/vfs/security: ... |
2820 |
error = security_inode_init_security(inode, dir, |
9d8f13ba3 security: new sec... |
2821 |
&dentry->d_name, |
6d9d88d07 tmpfs: security x... |
2822 |
shmem_initxattrs, NULL); |
feda821e7 fs: remove generi... |
2823 2824 |
if (error && error != -EOPNOTSUPP) goto out_iput; |
37ec43cdc evm: calculate HM... |
2825 |
|
718deb6b6 Fix breakage in s... |
2826 |
error = 0; |
1da177e4c Linux-2.6.12-rc2 |
2827 |
dir->i_size += BOGO_DIRENT_SIZE; |
078cd8279 fs: Replace CURRE... |
2828 |
dir->i_ctime = dir->i_mtime = current_time(dir); |
1da177e4c Linux-2.6.12-rc2 |
2829 2830 |
d_instantiate(dentry, inode); dget(dentry); /* Extra count - pin the dentry in core */ |
1da177e4c Linux-2.6.12-rc2 |
2831 2832 |
} return error; |
feda821e7 fs: remove generi... |
2833 2834 2835 |
out_iput: iput(inode); return error; |
1da177e4c Linux-2.6.12-rc2 |
2836 |
} |
60545d0d4 [O_TMPFILE] it's ... |
2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 |
static int shmem_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode) { struct inode *inode; int error = -ENOSPC; inode = shmem_get_inode(dir->i_sb, dir, mode, 0, VM_NORESERVE); if (inode) { error = security_inode_init_security(inode, dir, NULL, shmem_initxattrs, NULL); |
feda821e7 fs: remove generi... |
2848 2849 2850 2851 2852 |
if (error && error != -EOPNOTSUPP) goto out_iput; error = simple_acl_create(dir, inode); if (error) goto out_iput; |
60545d0d4 [O_TMPFILE] it's ... |
2853 2854 2855 |
d_tmpfile(dentry, inode); } return error; |
feda821e7 fs: remove generi... |
2856 2857 2858 |
out_iput: iput(inode); return error; |
60545d0d4 [O_TMPFILE] it's ... |
2859 |
} |
18bb1db3e switch vfs_mkdir(... |
2860 |
static int shmem_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
1da177e4c Linux-2.6.12-rc2 |
2861 2862 2863 2864 2865 |
{ int error; if ((error = shmem_mknod(dir, dentry, mode | S_IFDIR, 0))) return error; |
d8c76e6f4 [PATCH] r/o bind ... |
2866 |
inc_nlink(dir); |
1da177e4c Linux-2.6.12-rc2 |
2867 2868 |
return 0; } |
4acdaf27e switch ->create()... |
2869 |
static int shmem_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
ebfc3b49a don't pass nameid... |
2870 |
bool excl) |
1da177e4c Linux-2.6.12-rc2 |
2871 2872 2873 2874 2875 2876 2877 2878 2879 |
{ return shmem_mknod(dir, dentry, mode | S_IFREG, 0); } /* * Link a file.. */ static int shmem_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry) { |
75c3cfa85 VFS: assorted wei... |
2880 |
struct inode *inode = d_inode(old_dentry); |
29b00e609 tmpfs: fix uninit... |
2881 |
int ret = 0; |
1da177e4c Linux-2.6.12-rc2 |
2882 2883 2884 2885 2886 |
/* * No ordinary (disk based) filesystem counts links as inodes; * but each new link needs a new dentry, pinning lowmem, and * tmpfs dentries cannot be pruned until they are unlinked. |
1062af920 tmpfs: fix link a... |
2887 2888 |
* But if an O_TMPFILE file is linked into the tmpfs, the * first link must skip that, to get the accounting right. |
1da177e4c Linux-2.6.12-rc2 |
2889 |
*/ |
1062af920 tmpfs: fix link a... |
2890 |
if (inode->i_nlink) { |
e809d5f0b tmpfs: per-superb... |
2891 |
ret = shmem_reserve_inode(inode->i_sb, NULL); |
1062af920 tmpfs: fix link a... |
2892 2893 2894 |
if (ret) goto out; } |
1da177e4c Linux-2.6.12-rc2 |
2895 2896 |
dir->i_size += BOGO_DIRENT_SIZE; |
078cd8279 fs: Replace CURRE... |
2897 |
inode->i_ctime = dir->i_ctime = dir->i_mtime = current_time(inode); |
d8c76e6f4 [PATCH] r/o bind ... |
2898 |
inc_nlink(inode); |
7de9c6ee3 new helper: ihold() |
2899 |
ihold(inode); /* New dentry reference */ |
1da177e4c Linux-2.6.12-rc2 |
2900 2901 |
dget(dentry); /* Extra pinning count for the created dentry */ d_instantiate(dentry, inode); |
5b04c6890 shmem: factor out... |
2902 2903 |
out: return ret; |
1da177e4c Linux-2.6.12-rc2 |
2904 2905 2906 2907 |
} static int shmem_unlink(struct inode *dir, struct dentry *dentry) { |
75c3cfa85 VFS: assorted wei... |
2908 |
struct inode *inode = d_inode(dentry); |
1da177e4c Linux-2.6.12-rc2 |
2909 |
|
5b04c6890 shmem: factor out... |
2910 2911 |
if (inode->i_nlink > 1 && !S_ISDIR(inode->i_mode)) shmem_free_inode(inode->i_sb); |
1da177e4c Linux-2.6.12-rc2 |
2912 2913 |
dir->i_size -= BOGO_DIRENT_SIZE; |
078cd8279 fs: Replace CURRE... |
2914 |
inode->i_ctime = dir->i_ctime = dir->i_mtime = current_time(inode); |
9a53c3a78 [PATCH] r/o bind ... |
2915 |
drop_nlink(inode); |
1da177e4c Linux-2.6.12-rc2 |
2916 2917 2918 2919 2920 2921 2922 2923 |
dput(dentry); /* Undo the count from "create" - this does all the work */ return 0; } static int shmem_rmdir(struct inode *dir, struct dentry *dentry) { if (!simple_empty(dentry)) return -ENOTEMPTY; |
75c3cfa85 VFS: assorted wei... |
2924 |
drop_nlink(d_inode(dentry)); |
9a53c3a78 [PATCH] r/o bind ... |
2925 |
drop_nlink(dir); |
1da177e4c Linux-2.6.12-rc2 |
2926 2927 |
return shmem_unlink(dir, dentry); } |
37456771c shmem: support RE... |
2928 2929 |
static int shmem_exchange(struct inode *old_dir, struct dentry *old_dentry, struct inode *new_dir, struct dentry *new_dentry) { |
e36cb0b89 VFS: (Scripted) C... |
2930 2931 |
bool old_is_dir = d_is_dir(old_dentry); bool new_is_dir = d_is_dir(new_dentry); |
37456771c shmem: support RE... |
2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 |
if (old_dir != new_dir && old_is_dir != new_is_dir) { if (old_is_dir) { drop_nlink(old_dir); inc_nlink(new_dir); } else { drop_nlink(new_dir); inc_nlink(old_dir); } } old_dir->i_ctime = old_dir->i_mtime = new_dir->i_ctime = new_dir->i_mtime = |
75c3cfa85 VFS: assorted wei... |
2944 |
d_inode(old_dentry)->i_ctime = |
078cd8279 fs: Replace CURRE... |
2945 |
d_inode(new_dentry)->i_ctime = current_time(old_dir); |
37456771c shmem: support RE... |
2946 2947 2948 |
return 0; } |
46fdb794e shmem: support RE... |
2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 |
static int shmem_whiteout(struct inode *old_dir, struct dentry *old_dentry) { struct dentry *whiteout; int error; whiteout = d_alloc(old_dentry->d_parent, &old_dentry->d_name); if (!whiteout) return -ENOMEM; error = shmem_mknod(old_dir, whiteout, S_IFCHR | WHITEOUT_MODE, WHITEOUT_DEV); dput(whiteout); if (error) return error; /* * Cheat and hash the whiteout while the old dentry is still in * place, instead of playing games with FS_RENAME_DOES_D_MOVE. * * d_lookup() will consistently find one of them at this point, * not sure which one, but that isn't even important. */ d_rehash(whiteout); return 0; } |
1da177e4c Linux-2.6.12-rc2 |
2974 2975 2976 2977 2978 2979 |
/* * The VFS layer already does all the dentry stuff for rename, * we just have to decrement the usage count for the target if * it exists so that the VFS layer correctly free's it when it * gets overwritten. */ |
3b69ff51d shmem: support RE... |
2980 |
static int shmem_rename2(struct inode *old_dir, struct dentry *old_dentry, struct inode *new_dir, struct dentry *new_dentry, unsigned int flags) |
1da177e4c Linux-2.6.12-rc2 |
2981 |
{ |
75c3cfa85 VFS: assorted wei... |
2982 |
struct inode *inode = d_inode(old_dentry); |
1da177e4c Linux-2.6.12-rc2 |
2983 |
int they_are_dirs = S_ISDIR(inode->i_mode); |
46fdb794e shmem: support RE... |
2984 |
if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT)) |
3b69ff51d shmem: support RE... |
2985 |
return -EINVAL; |
37456771c shmem: support RE... |
2986 2987 |
if (flags & RENAME_EXCHANGE) return shmem_exchange(old_dir, old_dentry, new_dir, new_dentry); |
1da177e4c Linux-2.6.12-rc2 |
2988 2989 |
if (!simple_empty(new_dentry)) return -ENOTEMPTY; |
46fdb794e shmem: support RE... |
2990 2991 2992 2993 2994 2995 2996 |
if (flags & RENAME_WHITEOUT) { int error; error = shmem_whiteout(old_dir, old_dentry); if (error) return error; } |
75c3cfa85 VFS: assorted wei... |
2997 |
if (d_really_is_positive(new_dentry)) { |
1da177e4c Linux-2.6.12-rc2 |
2998 |
(void) shmem_unlink(new_dir, new_dentry); |
b928095b0 shmem: fix nlink ... |
2999 |
if (they_are_dirs) { |
75c3cfa85 VFS: assorted wei... |
3000 |
drop_nlink(d_inode(new_dentry)); |
9a53c3a78 [PATCH] r/o bind ... |
3001 |
drop_nlink(old_dir); |
b928095b0 shmem: fix nlink ... |
3002 |
} |
1da177e4c Linux-2.6.12-rc2 |
3003 |
} else if (they_are_dirs) { |
9a53c3a78 [PATCH] r/o bind ... |
3004 |
drop_nlink(old_dir); |
d8c76e6f4 [PATCH] r/o bind ... |
3005 |
inc_nlink(new_dir); |
1da177e4c Linux-2.6.12-rc2 |
3006 3007 3008 3009 3010 3011 |
} old_dir->i_size -= BOGO_DIRENT_SIZE; new_dir->i_size += BOGO_DIRENT_SIZE; old_dir->i_ctime = old_dir->i_mtime = new_dir->i_ctime = new_dir->i_mtime = |
078cd8279 fs: Replace CURRE... |
3012 |
inode->i_ctime = current_time(old_dir); |
1da177e4c Linux-2.6.12-rc2 |
3013 3014 3015 3016 3017 3018 3019 3020 |
return 0; } static int shmem_symlink(struct inode *dir, struct dentry *dentry, const char *symname) { int error; int len; struct inode *inode; |
9276aad6c tmpfs: remove_shm... |
3021 |
struct page *page; |
1da177e4c Linux-2.6.12-rc2 |
3022 3023 |
len = strlen(symname) + 1; |
09cbfeaf1 mm, fs: get rid o... |
3024 |
if (len > PAGE_SIZE) |
1da177e4c Linux-2.6.12-rc2 |
3025 |
return -ENAMETOOLONG; |
0825a6f98 mm: use octal not... |
3026 3027 |
inode = shmem_get_inode(dir->i_sb, dir, S_IFLNK | 0777, 0, VM_NORESERVE); |
1da177e4c Linux-2.6.12-rc2 |
3028 3029 |
if (!inode) return -ENOSPC; |
9d8f13ba3 security: new sec... |
3030 |
error = security_inode_init_security(inode, dir, &dentry->d_name, |
6d9d88d07 tmpfs: security x... |
3031 |
shmem_initxattrs, NULL); |
343c3d7f0 mm/shmem.c: clean... |
3032 3033 3034 |
if (error && error != -EOPNOTSUPP) { iput(inode); return error; |
570bc1c2e [PATCH] tmpfs: En... |
3035 |
} |
1da177e4c Linux-2.6.12-rc2 |
3036 |
inode->i_size = len-1; |
69f07ec93 tmpfs: use kmemdu... |
3037 |
if (len <= SHORT_SYMLINK_LEN) { |
3ed47db34 make sure that fr... |
3038 3039 |
inode->i_link = kmemdup(symname, len, GFP_KERNEL); if (!inode->i_link) { |
69f07ec93 tmpfs: use kmemdu... |
3040 3041 3042 3043 |
iput(inode); return -ENOMEM; } inode->i_op = &shmem_short_symlink_operations; |
1da177e4c Linux-2.6.12-rc2 |
3044 |
} else { |
e8ecde25f Make sure that hi... |
3045 |
inode_nohighmem(inode); |
9e18eb293 tmpfs: mem_cgroup... |
3046 |
error = shmem_getpage(inode, 0, &page, SGP_WRITE); |
1da177e4c Linux-2.6.12-rc2 |
3047 3048 3049 3050 |
if (error) { iput(inode); return error; } |
14fcc23fd tmpfs: fix kernel... |
3051 |
inode->i_mapping->a_ops = &shmem_aops; |
1da177e4c Linux-2.6.12-rc2 |
3052 |
inode->i_op = &shmem_symlink_inode_operations; |
21fc61c73 don't put symlink... |
3053 |
memcpy(page_address(page), symname, len); |
ec9516fbc tmpfs: optimize c... |
3054 |
SetPageUptodate(page); |
1da177e4c Linux-2.6.12-rc2 |
3055 |
set_page_dirty(page); |
6746aff74 HWPOISON: shmem: ... |
3056 |
unlock_page(page); |
09cbfeaf1 mm, fs: get rid o... |
3057 |
put_page(page); |
1da177e4c Linux-2.6.12-rc2 |
3058 |
} |
1da177e4c Linux-2.6.12-rc2 |
3059 |
dir->i_size += BOGO_DIRENT_SIZE; |
078cd8279 fs: Replace CURRE... |
3060 |
dir->i_ctime = dir->i_mtime = current_time(dir); |
1da177e4c Linux-2.6.12-rc2 |
3061 3062 3063 3064 |
d_instantiate(dentry, inode); dget(dentry); return 0; } |
fceef393a switch ->get_link... |
3065 |
static void shmem_put_link(void *arg) |
1da177e4c Linux-2.6.12-rc2 |
3066 |
{ |
fceef393a switch ->get_link... |
3067 3068 |
mark_page_accessed(arg); put_page(arg); |
1da177e4c Linux-2.6.12-rc2 |
3069 |
} |
6b2553918 replace ->follow_... |
3070 |
static const char *shmem_get_link(struct dentry *dentry, |
fceef393a switch ->get_link... |
3071 3072 |
struct inode *inode, struct delayed_call *done) |
1da177e4c Linux-2.6.12-rc2 |
3073 |
{ |
1da177e4c Linux-2.6.12-rc2 |
3074 |
struct page *page = NULL; |
6b2553918 replace ->follow_... |
3075 |
int error; |
6a6c99049 teach shmem_get_l... |
3076 3077 3078 3079 3080 3081 3082 3083 3084 |
if (!dentry) { page = find_get_page(inode->i_mapping, 0); if (!page) return ERR_PTR(-ECHILD); if (!PageUptodate(page)) { put_page(page); return ERR_PTR(-ECHILD); } } else { |
9e18eb293 tmpfs: mem_cgroup... |
3085 |
error = shmem_getpage(inode, 0, &page, SGP_READ); |
6a6c99049 teach shmem_get_l... |
3086 3087 3088 3089 |
if (error) return ERR_PTR(error); unlock_page(page); } |
fceef393a switch ->get_link... |
3090 |
set_delayed_call(done, shmem_put_link, page); |
21fc61c73 don't put symlink... |
3091 |
return page_address(page); |
1da177e4c Linux-2.6.12-rc2 |
3092 |
} |
b09e0fa4b tmpfs: implement ... |
3093 |
#ifdef CONFIG_TMPFS_XATTR |
467118102 mm/shmem and tiny... |
3094 |
/* |
b09e0fa4b tmpfs: implement ... |
3095 3096 |
* Superblocks without xattr inode operations may get some security.* xattr * support from the LSM "for free". As soon as we have any other xattrs |
39f0247d3 [PATCH] Access Co... |
3097 3098 3099 |
* like ACLs, we also need to implement the security.* handlers at * filesystem level, though. */ |
6d9d88d07 tmpfs: security x... |
3100 |
/* |
6d9d88d07 tmpfs: security x... |
3101 3102 3103 3104 3105 3106 3107 3108 |
* Callback for security_inode_init_security() for acquiring xattrs. */ static int shmem_initxattrs(struct inode *inode, const struct xattr *xattr_array, void *fs_info) { struct shmem_inode_info *info = SHMEM_I(inode); const struct xattr *xattr; |
38f386574 xattr: extract si... |
3109 |
struct simple_xattr *new_xattr; |
6d9d88d07 tmpfs: security x... |
3110 3111 3112 |
size_t len; for (xattr = xattr_array; xattr->name != NULL; xattr++) { |
38f386574 xattr: extract si... |
3113 |
new_xattr = simple_xattr_alloc(xattr->value, xattr->value_len); |
6d9d88d07 tmpfs: security x... |
3114 3115 3116 3117 3118 3119 3120 |
if (!new_xattr) return -ENOMEM; len = strlen(xattr->name) + 1; new_xattr->name = kmalloc(XATTR_SECURITY_PREFIX_LEN + len, GFP_KERNEL); if (!new_xattr->name) { |
3bef735ad vfs/xattr: mm/shm... |
3121 |
kvfree(new_xattr); |
6d9d88d07 tmpfs: security x... |
3122 3123 3124 3125 3126 3127 3128 |
return -ENOMEM; } memcpy(new_xattr->name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN); memcpy(new_xattr->name + XATTR_SECURITY_PREFIX_LEN, xattr->name, len); |
38f386574 xattr: extract si... |
3129 |
simple_xattr_list_add(&info->xattrs, new_xattr); |
6d9d88d07 tmpfs: security x... |
3130 3131 3132 3133 |
} return 0; } |
aa7c5241c tmpfs: Use xattr ... |
3134 |
static int shmem_xattr_handler_get(const struct xattr_handler *handler, |
b296821a7 xattr_handler: pa... |
3135 |
struct dentry *unused, struct inode *inode, |
3484eba91 FROMLIST: Add fla... |
3136 3137 |
const char *name, void *buffer, size_t size, int flags) |
b09e0fa4b tmpfs: implement ... |
3138 |
{ |
b296821a7 xattr_handler: pa... |
3139 |
struct shmem_inode_info *info = SHMEM_I(inode); |
b09e0fa4b tmpfs: implement ... |
3140 |
|
aa7c5241c tmpfs: Use xattr ... |
3141 |
name = xattr_full_name(handler, name); |
38f386574 xattr: extract si... |
3142 |
return simple_xattr_get(&info->xattrs, name, buffer, size); |
b09e0fa4b tmpfs: implement ... |
3143 |
} |
aa7c5241c tmpfs: Use xattr ... |
3144 |
static int shmem_xattr_handler_set(const struct xattr_handler *handler, |
593012268 switch xattr_hand... |
3145 3146 3147 |
struct dentry *unused, struct inode *inode, const char *name, const void *value, size_t size, int flags) |
b09e0fa4b tmpfs: implement ... |
3148 |
{ |
593012268 switch xattr_hand... |
3149 |
struct shmem_inode_info *info = SHMEM_I(inode); |
b09e0fa4b tmpfs: implement ... |
3150 |
|
aa7c5241c tmpfs: Use xattr ... |
3151 |
name = xattr_full_name(handler, name); |
a46a22955 kernfs: Add remov... |
3152 |
return simple_xattr_set(&info->xattrs, name, value, size, flags, NULL); |
b09e0fa4b tmpfs: implement ... |
3153 |
} |
aa7c5241c tmpfs: Use xattr ... |
3154 3155 3156 3157 3158 |
static const struct xattr_handler shmem_security_xattr_handler = { .prefix = XATTR_SECURITY_PREFIX, .get = shmem_xattr_handler_get, .set = shmem_xattr_handler_set, }; |
b09e0fa4b tmpfs: implement ... |
3159 |
|
aa7c5241c tmpfs: Use xattr ... |
3160 3161 3162 3163 3164 |
static const struct xattr_handler shmem_trusted_xattr_handler = { .prefix = XATTR_TRUSTED_PREFIX, .get = shmem_xattr_handler_get, .set = shmem_xattr_handler_set, }; |
b09e0fa4b tmpfs: implement ... |
3165 |
|
aa7c5241c tmpfs: Use xattr ... |
3166 3167 3168 3169 3170 3171 3172 3173 3174 |
static const struct xattr_handler *shmem_xattr_handlers[] = { #ifdef CONFIG_TMPFS_POSIX_ACL &posix_acl_access_xattr_handler, &posix_acl_default_xattr_handler, #endif &shmem_security_xattr_handler, &shmem_trusted_xattr_handler, NULL }; |
b09e0fa4b tmpfs: implement ... |
3175 3176 3177 |
static ssize_t shmem_listxattr(struct dentry *dentry, char *buffer, size_t size) { |
75c3cfa85 VFS: assorted wei... |
3178 |
struct shmem_inode_info *info = SHMEM_I(d_inode(dentry)); |
786534b92 tmpfs: listxattr ... |
3179 |
return simple_xattr_list(d_inode(dentry), &info->xattrs, buffer, size); |
b09e0fa4b tmpfs: implement ... |
3180 3181 |
} #endif /* CONFIG_TMPFS_XATTR */ |
69f07ec93 tmpfs: use kmemdu... |
3182 |
static const struct inode_operations shmem_short_symlink_operations = { |
6b2553918 replace ->follow_... |
3183 |
.get_link = simple_get_link, |
b09e0fa4b tmpfs: implement ... |
3184 |
#ifdef CONFIG_TMPFS_XATTR |
b09e0fa4b tmpfs: implement ... |
3185 |
.listxattr = shmem_listxattr, |
b09e0fa4b tmpfs: implement ... |
3186 3187 3188 3189 |
#endif }; static const struct inode_operations shmem_symlink_inode_operations = { |
6b2553918 replace ->follow_... |
3190 |
.get_link = shmem_get_link, |
b09e0fa4b tmpfs: implement ... |
3191 |
#ifdef CONFIG_TMPFS_XATTR |
b09e0fa4b tmpfs: implement ... |
3192 |
.listxattr = shmem_listxattr, |
39f0247d3 [PATCH] Access Co... |
3193 |
#endif |
b09e0fa4b tmpfs: implement ... |
3194 |
}; |
39f0247d3 [PATCH] Access Co... |
3195 |
|
91828a405 [PATCH] knfsd: ad... |
3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 |
static struct dentry *shmem_get_parent(struct dentry *child) { return ERR_PTR(-ESTALE); } static int shmem_match(struct inode *ino, void *vfh) { __u32 *fh = vfh; __u64 inum = fh[2]; inum = (inum << 32) | fh[1]; return ino->i_ino == inum && fh[0] == ino->i_generation; } |
12ba780d6 tmpfs: allow deco... |
3208 3209 3210 3211 3212 3213 3214 |
/* Find any alias of inode, but prefer a hashed alias */ static struct dentry *shmem_find_alias(struct inode *inode) { struct dentry *alias = d_find_alias(inode); return alias ?: d_find_any_alias(inode); } |
480b116c9 shmem: new export... |
3215 3216 |
static struct dentry *shmem_fh_to_dentry(struct super_block *sb, struct fid *fid, int fh_len, int fh_type) |
91828a405 [PATCH] knfsd: ad... |
3217 |
{ |
91828a405 [PATCH] knfsd: ad... |
3218 |
struct inode *inode; |
480b116c9 shmem: new export... |
3219 |
struct dentry *dentry = NULL; |
35c2a7f49 tmpfs,ceph,gfs2,i... |
3220 |
u64 inum; |
480b116c9 shmem: new export... |
3221 3222 3223 |
if (fh_len < 3) return NULL; |
91828a405 [PATCH] knfsd: ad... |
3224 |
|
35c2a7f49 tmpfs,ceph,gfs2,i... |
3225 3226 |
inum = fid->raw[2]; inum = (inum << 32) | fid->raw[1]; |
480b116c9 shmem: new export... |
3227 3228 |
inode = ilookup5(sb, (unsigned long)(inum + fid->raw[0]), shmem_match, fid->raw); |
91828a405 [PATCH] knfsd: ad... |
3229 |
if (inode) { |
12ba780d6 tmpfs: allow deco... |
3230 |
dentry = shmem_find_alias(inode); |
91828a405 [PATCH] knfsd: ad... |
3231 3232 |
iput(inode); } |
480b116c9 shmem: new export... |
3233 |
return dentry; |
91828a405 [PATCH] knfsd: ad... |
3234 |
} |
b0b0382bb ->encode_fh() API... |
3235 3236 |
static int shmem_encode_fh(struct inode *inode, __u32 *fh, int *len, struct inode *parent) |
91828a405 [PATCH] knfsd: ad... |
3237 |
{ |
5fe0c2378 exportfs: Return ... |
3238 3239 |
if (*len < 3) { *len = 3; |
94e07a759 fs: encode_fh: re... |
3240 |
return FILEID_INVALID; |
5fe0c2378 exportfs: Return ... |
3241 |
} |
91828a405 [PATCH] knfsd: ad... |
3242 |
|
1d3382cbf new helper: inode... |
3243 |
if (inode_unhashed(inode)) { |
91828a405 [PATCH] knfsd: ad... |
3244 3245 3246 3247 3248 3249 3250 |
/* Unfortunately insert_inode_hash is not idempotent, * so as we hash inodes here rather than at creation * time, we need a lock to ensure we only try * to do it once */ static DEFINE_SPINLOCK(lock); spin_lock(&lock); |
1d3382cbf new helper: inode... |
3251 |
if (inode_unhashed(inode)) |
91828a405 [PATCH] knfsd: ad... |
3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 |
__insert_inode_hash(inode, inode->i_ino + inode->i_generation); spin_unlock(&lock); } fh[0] = inode->i_generation; fh[1] = inode->i_ino; fh[2] = ((__u64)inode->i_ino) >> 32; *len = 3; return 1; } |
396551644 exportfs: make st... |
3264 |
static const struct export_operations shmem_export_ops = { |
91828a405 [PATCH] knfsd: ad... |
3265 |
.get_parent = shmem_get_parent, |
91828a405 [PATCH] knfsd: ad... |
3266 |
.encode_fh = shmem_encode_fh, |
480b116c9 shmem: new export... |
3267 |
.fh_to_dentry = shmem_fh_to_dentry, |
91828a405 [PATCH] knfsd: ad... |
3268 |
}; |
626c3920a shmem_parse_one()... |
3269 3270 3271 3272 3273 3274 3275 3276 3277 |
enum shmem_param { Opt_gid, Opt_huge, Opt_mode, Opt_mpol, Opt_nr_blocks, Opt_nr_inodes, Opt_size, Opt_uid, |
ea3271f71 tmpfs: support 64... |
3278 3279 |
Opt_inode32, Opt_inode64, |
626c3920a shmem_parse_one()... |
3280 |
}; |
5eede6252 fold struct fs_pa... |
3281 |
static const struct constant_table shmem_param_enums_huge[] = { |
2710c957a fs_parse: get rid... |
3282 3283 3284 3285 |
{"never", SHMEM_HUGE_NEVER }, {"always", SHMEM_HUGE_ALWAYS }, {"within_size", SHMEM_HUGE_WITHIN_SIZE }, {"advise", SHMEM_HUGE_ADVISE }, |
2710c957a fs_parse: get rid... |
3286 3287 |
{} }; |
d7167b149 fs_parse: fold fs... |
3288 |
const struct fs_parameter_spec shmem_fs_parameters[] = { |
626c3920a shmem_parse_one()... |
3289 |
fsparam_u32 ("gid", Opt_gid), |
2710c957a fs_parse: get rid... |
3290 |
fsparam_enum ("huge", Opt_huge, shmem_param_enums_huge), |
626c3920a shmem_parse_one()... |
3291 3292 3293 3294 3295 3296 |
fsparam_u32oct("mode", Opt_mode), fsparam_string("mpol", Opt_mpol), fsparam_string("nr_blocks", Opt_nr_blocks), fsparam_string("nr_inodes", Opt_nr_inodes), fsparam_string("size", Opt_size), fsparam_u32 ("uid", Opt_uid), |
ea3271f71 tmpfs: support 64... |
3297 3298 |
fsparam_flag ("inode32", Opt_inode32), fsparam_flag ("inode64", Opt_inode64), |
626c3920a shmem_parse_one()... |
3299 3300 |
{} }; |
f32356261 vfs: Convert ramf... |
3301 |
static int shmem_parse_one(struct fs_context *fc, struct fs_parameter *param) |
1da177e4c Linux-2.6.12-rc2 |
3302 |
{ |
f32356261 vfs: Convert ramf... |
3303 |
struct shmem_options *ctx = fc->fs_private; |
626c3920a shmem_parse_one()... |
3304 3305 |
struct fs_parse_result result; unsigned long long size; |
e04dc423a shmem_parse_optio... |
3306 |
char *rest; |
626c3920a shmem_parse_one()... |
3307 |
int opt; |
d7167b149 fs_parse: fold fs... |
3308 |
opt = fs_parse(fc, shmem_fs_parameters, param, &result); |
f32356261 vfs: Convert ramf... |
3309 |
if (opt < 0) |
626c3920a shmem_parse_one()... |
3310 |
return opt; |
1da177e4c Linux-2.6.12-rc2 |
3311 |
|
626c3920a shmem_parse_one()... |
3312 3313 3314 |
switch (opt) { case Opt_size: size = memparse(param->string, &rest); |
e04dc423a shmem_parse_optio... |
3315 3316 3317 3318 3319 3320 3321 |
if (*rest == '%') { size <<= PAGE_SHIFT; size *= totalram_pages(); do_div(size, 100); rest++; } if (*rest) |
626c3920a shmem_parse_one()... |
3322 |
goto bad_value; |
e04dc423a shmem_parse_optio... |
3323 3324 |
ctx->blocks = DIV_ROUND_UP(size, PAGE_SIZE); ctx->seen |= SHMEM_SEEN_BLOCKS; |
626c3920a shmem_parse_one()... |
3325 3326 3327 |
break; case Opt_nr_blocks: ctx->blocks = memparse(param->string, &rest); |
e04dc423a shmem_parse_optio... |
3328 |
if (*rest) |
626c3920a shmem_parse_one()... |
3329 |
goto bad_value; |
e04dc423a shmem_parse_optio... |
3330 |
ctx->seen |= SHMEM_SEEN_BLOCKS; |
626c3920a shmem_parse_one()... |
3331 3332 3333 |
break; case Opt_nr_inodes: ctx->inodes = memparse(param->string, &rest); |
e04dc423a shmem_parse_optio... |
3334 |
if (*rest) |
626c3920a shmem_parse_one()... |
3335 |
goto bad_value; |
e04dc423a shmem_parse_optio... |
3336 |
ctx->seen |= SHMEM_SEEN_INODES; |
626c3920a shmem_parse_one()... |
3337 3338 3339 3340 3341 3342 |
break; case Opt_mode: ctx->mode = result.uint_32 & 07777; break; case Opt_uid: ctx->uid = make_kuid(current_user_ns(), result.uint_32); |
e04dc423a shmem_parse_optio... |
3343 |
if (!uid_valid(ctx->uid)) |
626c3920a shmem_parse_one()... |
3344 3345 3346 3347 |
goto bad_value; break; case Opt_gid: ctx->gid = make_kgid(current_user_ns(), result.uint_32); |
e04dc423a shmem_parse_optio... |
3348 |
if (!gid_valid(ctx->gid)) |
626c3920a shmem_parse_one()... |
3349 3350 3351 3352 3353 |
goto bad_value; break; case Opt_huge: ctx->huge = result.uint_32; if (ctx->huge != SHMEM_HUGE_NEVER && |
396bcc529 mm: remove CONFIG... |
3354 |
!(IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE) && |
626c3920a shmem_parse_one()... |
3355 3356 |
has_transparent_hugepage())) goto unsupported_parameter; |
e04dc423a shmem_parse_optio... |
3357 |
ctx->seen |= SHMEM_SEEN_HUGE; |
626c3920a shmem_parse_one()... |
3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 |
break; case Opt_mpol: if (IS_ENABLED(CONFIG_NUMA)) { mpol_put(ctx->mpol); ctx->mpol = NULL; if (mpol_parse_str(param->string, &ctx->mpol)) goto bad_value; break; } goto unsupported_parameter; |
ea3271f71 tmpfs: support 64... |
3368 3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 |
case Opt_inode32: ctx->full_inums = false; ctx->seen |= SHMEM_SEEN_INUMS; break; case Opt_inode64: if (sizeof(ino_t) < 8) { return invalfc(fc, "Cannot use inode64 with <64bit inums in kernel "); } ctx->full_inums = true; ctx->seen |= SHMEM_SEEN_INUMS; break; |
e04dc423a shmem_parse_optio... |
3381 3382 |
} return 0; |
626c3920a shmem_parse_one()... |
3383 |
unsupported_parameter: |
f35aa2bc8 tmpfs: switch to ... |
3384 |
return invalfc(fc, "Unsupported parameter '%s'", param->key); |
626c3920a shmem_parse_one()... |
3385 |
bad_value: |
f35aa2bc8 tmpfs: switch to ... |
3386 |
return invalfc(fc, "Bad value for '%s'", param->key); |
e04dc423a shmem_parse_optio... |
3387 |
} |
f32356261 vfs: Convert ramf... |
3388 |
static int shmem_parse_options(struct fs_context *fc, void *data) |
e04dc423a shmem_parse_optio... |
3389 |
{ |
f32356261 vfs: Convert ramf... |
3390 |
char *options = data; |
33f37c648 shmem: fix LSM op... |
3391 3392 3393 3394 3395 |
if (options) { int err = security_sb_eat_lsm_opts(options, &fc->security); if (err) return err; } |
b00dc3ad7 [PATCH] tmpfs: fi... |
3396 |
while (options != NULL) { |
626c3920a shmem_parse_one()... |
3397 |
char *this_char = options; |
b00dc3ad7 [PATCH] tmpfs: fi... |
3398 3399 3400 3401 3402 3403 3404 3405 3406 3407 3408 3409 3410 3411 3412 |
for (;;) { /* * NUL-terminate this option: unfortunately, * mount options form a comma-separated list, * but mpol's nodelist may also contain commas. */ options = strchr(options, ','); if (options == NULL) break; options++; if (!isdigit(*options)) { options[-1] = '\0'; break; } } |
626c3920a shmem_parse_one()... |
3413 3414 |
if (*this_char) { char *value = strchr(this_char,'='); |
f32356261 vfs: Convert ramf... |
3415 |
size_t len = 0; |
626c3920a shmem_parse_one()... |
3416 3417 3418 3419 |
int err; if (value) { *value++ = '\0'; |
f32356261 vfs: Convert ramf... |
3420 |
len = strlen(value); |
626c3920a shmem_parse_one()... |
3421 |
} |
f32356261 vfs: Convert ramf... |
3422 3423 3424 |
err = vfs_parse_fs_string(fc, this_char, value, len); if (err < 0) return err; |
1da177e4c Linux-2.6.12-rc2 |
3425 |
} |
1da177e4c Linux-2.6.12-rc2 |
3426 3427 |
} return 0; |
1da177e4c Linux-2.6.12-rc2 |
3428 |
} |
f32356261 vfs: Convert ramf... |
3429 3430 3431 3432 3433 3434 3435 3436 |
/* * Reconfigure a shmem filesystem. * * Note that we disallow change from limited->unlimited blocks/inodes while any * are in use; but we must separately disallow unlimited->limited, because in * that case we have no record of how much is already in use. */ static int shmem_reconfigure(struct fs_context *fc) |
1da177e4c Linux-2.6.12-rc2 |
3437 |
{ |
f32356261 vfs: Convert ramf... |
3438 3439 |
struct shmem_options *ctx = fc->fs_private; struct shmem_sb_info *sbinfo = SHMEM_SB(fc->root->d_sb); |
0edd73b33 [PATCH] shmem: re... |
3440 |
unsigned long inodes; |
f32356261 vfs: Convert ramf... |
3441 |
const char *err; |
1da177e4c Linux-2.6.12-rc2 |
3442 |
|
0edd73b33 [PATCH] shmem: re... |
3443 |
spin_lock(&sbinfo->stat_lock); |
0edd73b33 [PATCH] shmem: re... |
3444 |
inodes = sbinfo->max_inodes - sbinfo->free_inodes; |
f32356261 vfs: Convert ramf... |
3445 3446 3447 |
if ((ctx->seen & SHMEM_SEEN_BLOCKS) && ctx->blocks) { if (!sbinfo->max_blocks) { err = "Cannot retroactively limit size"; |
0b5071dd3 shmem_parse_optio... |
3448 |
goto out; |
f32356261 vfs: Convert ramf... |
3449 |
} |
0b5071dd3 shmem_parse_optio... |
3450 |
if (percpu_counter_compare(&sbinfo->used_blocks, |
f32356261 vfs: Convert ramf... |
3451 3452 |
ctx->blocks) > 0) { err = "Too small a size for current use"; |
0b5071dd3 shmem_parse_optio... |
3453 |
goto out; |
f32356261 vfs: Convert ramf... |
3454 |
} |
0b5071dd3 shmem_parse_optio... |
3455 |
} |
f32356261 vfs: Convert ramf... |
3456 3457 3458 |
if ((ctx->seen & SHMEM_SEEN_INODES) && ctx->inodes) { if (!sbinfo->max_inodes) { err = "Cannot retroactively limit inodes"; |
0b5071dd3 shmem_parse_optio... |
3459 |
goto out; |
f32356261 vfs: Convert ramf... |
3460 3461 3462 |
} if (ctx->inodes < inodes) { err = "Too few inodes for current use"; |
0b5071dd3 shmem_parse_optio... |
3463 |
goto out; |
f32356261 vfs: Convert ramf... |
3464 |
} |
0b5071dd3 shmem_parse_optio... |
3465 |
} |
0edd73b33 [PATCH] shmem: re... |
3466 |
|
ea3271f71 tmpfs: support 64... |
3467 3468 3469 3470 3471 |
if ((ctx->seen & SHMEM_SEEN_INUMS) && !ctx->full_inums && sbinfo->next_ino > UINT_MAX) { err = "Current inum too high to switch to 32-bit inums"; goto out; } |
f32356261 vfs: Convert ramf... |
3472 3473 |
if (ctx->seen & SHMEM_SEEN_HUGE) sbinfo->huge = ctx->huge; |
ea3271f71 tmpfs: support 64... |
3474 3475 |
if (ctx->seen & SHMEM_SEEN_INUMS) sbinfo->full_inums = ctx->full_inums; |
f32356261 vfs: Convert ramf... |
3476 3477 3478 3479 3480 |
if (ctx->seen & SHMEM_SEEN_BLOCKS) sbinfo->max_blocks = ctx->blocks; if (ctx->seen & SHMEM_SEEN_INODES) { sbinfo->max_inodes = ctx->inodes; sbinfo->free_inodes = ctx->inodes - inodes; |
0b5071dd3 shmem_parse_optio... |
3481 |
} |
71fe804b6 mempolicy: use st... |
3482 |
|
5f00110f7 tmpfs: fix use-af... |
3483 3484 3485 |
/* * Preserve previous mempolicy unless mpol remount option was specified. */ |
f32356261 vfs: Convert ramf... |
3486 |
if (ctx->mpol) { |
5f00110f7 tmpfs: fix use-af... |
3487 |
mpol_put(sbinfo->mpol); |
f32356261 vfs: Convert ramf... |
3488 3489 |
sbinfo->mpol = ctx->mpol; /* transfers initial ref */ ctx->mpol = NULL; |
5f00110f7 tmpfs: fix use-af... |
3490 |
} |
f32356261 vfs: Convert ramf... |
3491 3492 |
spin_unlock(&sbinfo->stat_lock); return 0; |
0edd73b33 [PATCH] shmem: re... |
3493 3494 |
out: spin_unlock(&sbinfo->stat_lock); |
f35aa2bc8 tmpfs: switch to ... |
3495 |
return invalfc(fc, "%s", err); |
1da177e4c Linux-2.6.12-rc2 |
3496 |
} |
680d794ba mount options: fi... |
3497 |
|
34c80b1d9 vfs: switch ->sho... |
3498 |
static int shmem_show_options(struct seq_file *seq, struct dentry *root) |
680d794ba mount options: fi... |
3499 |
{ |
34c80b1d9 vfs: switch ->sho... |
3500 |
struct shmem_sb_info *sbinfo = SHMEM_SB(root->d_sb); |
680d794ba mount options: fi... |
3501 3502 3503 |
if (sbinfo->max_blocks != shmem_default_max_blocks()) seq_printf(seq, ",size=%luk", |
09cbfeaf1 mm, fs: get rid o... |
3504 |
sbinfo->max_blocks << (PAGE_SHIFT - 10)); |
680d794ba mount options: fi... |
3505 3506 |
if (sbinfo->max_inodes != shmem_default_max_inodes()) seq_printf(seq, ",nr_inodes=%lu", sbinfo->max_inodes); |
0825a6f98 mm: use octal not... |
3507 |
if (sbinfo->mode != (0777 | S_ISVTX)) |
09208d150 shmem, ramfs: pro... |
3508 |
seq_printf(seq, ",mode=%03ho", sbinfo->mode); |
8751e0395 userns: Convert t... |
3509 3510 3511 3512 3513 3514 |
if (!uid_eq(sbinfo->uid, GLOBAL_ROOT_UID)) seq_printf(seq, ",uid=%u", from_kuid_munged(&init_user_ns, sbinfo->uid)); if (!gid_eq(sbinfo->gid, GLOBAL_ROOT_GID)) seq_printf(seq, ",gid=%u", from_kgid_munged(&init_user_ns, sbinfo->gid)); |
ea3271f71 tmpfs: support 64... |
3515 3516 3517 3518 3519 3520 3521 3522 3523 3524 3525 3526 3527 3528 3529 3530 3531 3532 3533 3534 3535 3536 3537 |
/* * Showing inode{64,32} might be useful even if it's the system default, * since then people don't have to resort to checking both here and * /proc/config.gz to confirm 64-bit inums were successfully applied * (which may not even exist if IKCONFIG_PROC isn't enabled). * * We hide it when inode64 isn't the default and we are using 32-bit * inodes, since that probably just means the feature isn't even under * consideration. * * As such: * * +-----------------+-----------------+ * | TMPFS_INODE64=y | TMPFS_INODE64=n | * +------------------+-----------------+-----------------+ * | full_inums=true | show | show | * | full_inums=false | show | hide | * +------------------+-----------------+-----------------+ * */ if (IS_ENABLED(CONFIG_TMPFS_INODE64) || sbinfo->full_inums) seq_printf(seq, ",inode%d", (sbinfo->full_inums ? 64 : 32)); |
396bcc529 mm: remove CONFIG... |
3538 |
#ifdef CONFIG_TRANSPARENT_HUGEPAGE |
5a6e75f81 shmem: prepare hu... |
3539 3540 3541 3542 |
/* Rightly or wrongly, show huge mount option unmasked by shmem_huge */ if (sbinfo->huge) seq_printf(seq, ",huge=%s", shmem_format_huge(sbinfo->huge)); #endif |
71fe804b6 mempolicy: use st... |
3543 |
shmem_show_mpol(seq, sbinfo->mpol); |
680d794ba mount options: fi... |
3544 3545 |
return 0; } |
9183df25f shm: add memfd_cr... |
3546 |
|
680d794ba mount options: fi... |
3547 |
#endif /* CONFIG_TMPFS */ |
1da177e4c Linux-2.6.12-rc2 |
3548 3549 3550 |
static void shmem_put_super(struct super_block *sb) { |
602586a83 shmem: put_super ... |
3551 |
struct shmem_sb_info *sbinfo = SHMEM_SB(sb); |
e809d5f0b tmpfs: per-superb... |
3552 |
free_percpu(sbinfo->ino_batch); |
602586a83 shmem: put_super ... |
3553 |
percpu_counter_destroy(&sbinfo->used_blocks); |
49cd0a5c2 tmpfs: fix mempol... |
3554 |
mpol_put(sbinfo->mpol); |
602586a83 shmem: put_super ... |
3555 |
kfree(sbinfo); |
1da177e4c Linux-2.6.12-rc2 |
3556 3557 |
sb->s_fs_info = NULL; } |
f32356261 vfs: Convert ramf... |
3558 |
static int shmem_fill_super(struct super_block *sb, struct fs_context *fc) |
1da177e4c Linux-2.6.12-rc2 |
3559 |
{ |
f32356261 vfs: Convert ramf... |
3560 |
struct shmem_options *ctx = fc->fs_private; |
1da177e4c Linux-2.6.12-rc2 |
3561 |
struct inode *inode; |
0edd73b33 [PATCH] shmem: re... |
3562 |
struct shmem_sb_info *sbinfo; |
680d794ba mount options: fi... |
3563 3564 3565 |
int err = -ENOMEM; /* Round up to L1_CACHE_BYTES to resist false sharing */ |
425fbf047 shmem: initialize... |
3566 |
sbinfo = kzalloc(max((int)sizeof(struct shmem_sb_info), |
680d794ba mount options: fi... |
3567 3568 3569 |
L1_CACHE_BYTES), GFP_KERNEL); if (!sbinfo) return -ENOMEM; |
680d794ba mount options: fi... |
3570 |
sb->s_fs_info = sbinfo; |
1da177e4c Linux-2.6.12-rc2 |
3571 |
|
0edd73b33 [PATCH] shmem: re... |
3572 |
#ifdef CONFIG_TMPFS |
1da177e4c Linux-2.6.12-rc2 |
3573 3574 3575 3576 3577 |
/* * Per default we only allow half of the physical ram per * tmpfs instance, limiting inodes to one per page of lowmem; * but the internal instance is left unlimited. */ |
1751e8a6c Rename superblock... |
3578 |
if (!(sb->s_flags & SB_KERNMOUNT)) { |
f32356261 vfs: Convert ramf... |
3579 3580 3581 3582 |
if (!(ctx->seen & SHMEM_SEEN_BLOCKS)) ctx->blocks = shmem_default_max_blocks(); if (!(ctx->seen & SHMEM_SEEN_INODES)) ctx->inodes = shmem_default_max_inodes(); |
ea3271f71 tmpfs: support 64... |
3583 3584 |
if (!(ctx->seen & SHMEM_SEEN_INUMS)) ctx->full_inums = IS_ENABLED(CONFIG_TMPFS_INODE64); |
ca4e05195 shm_mnt is as lon... |
3585 |
} else { |
1751e8a6c Rename superblock... |
3586 |
sb->s_flags |= SB_NOUSER; |
1da177e4c Linux-2.6.12-rc2 |
3587 |
} |
91828a405 [PATCH] knfsd: ad... |
3588 |
sb->s_export_op = &shmem_export_ops; |
1751e8a6c Rename superblock... |
3589 |
sb->s_flags |= SB_NOSEC; |
1da177e4c Linux-2.6.12-rc2 |
3590 |
#else |
1751e8a6c Rename superblock... |
3591 |
sb->s_flags |= SB_NOUSER; |
1da177e4c Linux-2.6.12-rc2 |
3592 |
#endif |
f32356261 vfs: Convert ramf... |
3593 3594 |
sbinfo->max_blocks = ctx->blocks; sbinfo->free_inodes = sbinfo->max_inodes = ctx->inodes; |
e809d5f0b tmpfs: per-superb... |
3595 3596 3597 3598 3599 |
if (sb->s_flags & SB_KERNMOUNT) { sbinfo->ino_batch = alloc_percpu(ino_t); if (!sbinfo->ino_batch) goto failed; } |
f32356261 vfs: Convert ramf... |
3600 3601 |
sbinfo->uid = ctx->uid; sbinfo->gid = ctx->gid; |
ea3271f71 tmpfs: support 64... |
3602 |
sbinfo->full_inums = ctx->full_inums; |
f32356261 vfs: Convert ramf... |
3603 3604 3605 3606 |
sbinfo->mode = ctx->mode; sbinfo->huge = ctx->huge; sbinfo->mpol = ctx->mpol; ctx->mpol = NULL; |
1da177e4c Linux-2.6.12-rc2 |
3607 |
|
0edd73b33 [PATCH] shmem: re... |
3608 |
spin_lock_init(&sbinfo->stat_lock); |
908c7f194 percpu_counter: a... |
3609 |
if (percpu_counter_init(&sbinfo->used_blocks, 0, GFP_KERNEL)) |
602586a83 shmem: put_super ... |
3610 |
goto failed; |
779750d20 shmem: split huge... |
3611 3612 |
spin_lock_init(&sbinfo->shrinklist_lock); INIT_LIST_HEAD(&sbinfo->shrinklist); |
0edd73b33 [PATCH] shmem: re... |
3613 |
|
285b2c4fd tmpfs: demolish o... |
3614 |
sb->s_maxbytes = MAX_LFS_FILESIZE; |
09cbfeaf1 mm, fs: get rid o... |
3615 3616 |
sb->s_blocksize = PAGE_SIZE; sb->s_blocksize_bits = PAGE_SHIFT; |
1da177e4c Linux-2.6.12-rc2 |
3617 3618 |
sb->s_magic = TMPFS_MAGIC; sb->s_op = &shmem_ops; |
cfd95a9cf [PATCH] tmpfs: ti... |
3619 |
sb->s_time_gran = 1; |
b09e0fa4b tmpfs: implement ... |
3620 |
#ifdef CONFIG_TMPFS_XATTR |
39f0247d3 [PATCH] Access Co... |
3621 |
sb->s_xattr = shmem_xattr_handlers; |
b09e0fa4b tmpfs: implement ... |
3622 3623 |
#endif #ifdef CONFIG_TMPFS_POSIX_ACL |
1751e8a6c Rename superblock... |
3624 |
sb->s_flags |= SB_POSIXACL; |
39f0247d3 [PATCH] Access Co... |
3625 |
#endif |
2b4db7961 tmpfs: generate r... |
3626 |
uuid_gen(&sb->s_uuid); |
0edd73b33 [PATCH] shmem: re... |
3627 |
|
454abafe9 ramfs: replace in... |
3628 |
inode = shmem_get_inode(sb, NULL, S_IFDIR | sbinfo->mode, 0, VM_NORESERVE); |
1da177e4c Linux-2.6.12-rc2 |
3629 3630 |
if (!inode) goto failed; |
680d794ba mount options: fi... |
3631 3632 |
inode->i_uid = sbinfo->uid; inode->i_gid = sbinfo->gid; |
318ceed08 tidy up after d_m... |
3633 3634 |
sb->s_root = d_make_root(inode); if (!sb->s_root) |
48fde701a switch open-coded... |
3635 |
goto failed; |
1da177e4c Linux-2.6.12-rc2 |
3636 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
3637 3638 3639 3640 |
failed: shmem_put_super(sb); return err; } |
f32356261 vfs: Convert ramf... |
3641 3642 3643 3644 3645 3646 3647 3648 3649 3650 3651 3652 3653 3654 3655 3656 3657 3658 3659 3660 3661 3662 3663 3664 |
static int shmem_get_tree(struct fs_context *fc) { return get_tree_nodev(fc, shmem_fill_super); } static void shmem_free_fc(struct fs_context *fc) { struct shmem_options *ctx = fc->fs_private; if (ctx) { mpol_put(ctx->mpol); kfree(ctx); } } static const struct fs_context_operations shmem_fs_context_ops = { .free = shmem_free_fc, .get_tree = shmem_get_tree, #ifdef CONFIG_TMPFS .parse_monolithic = shmem_parse_options, .parse_param = shmem_parse_one, .reconfigure = shmem_reconfigure, #endif }; |
fcc234f88 [PATCH] mm: kill ... |
3665 |
static struct kmem_cache *shmem_inode_cachep; |
1da177e4c Linux-2.6.12-rc2 |
3666 3667 3668 |
static struct inode *shmem_alloc_inode(struct super_block *sb) { |
41ffe5d5c tmpfs: miscellane... |
3669 3670 3671 |
struct shmem_inode_info *info; info = kmem_cache_alloc(shmem_inode_cachep, GFP_KERNEL); if (!info) |
1da177e4c Linux-2.6.12-rc2 |
3672 |
return NULL; |
41ffe5d5c tmpfs: miscellane... |
3673 |
return &info->vfs_inode; |
1da177e4c Linux-2.6.12-rc2 |
3674 |
} |
74b1da564 shmem: make use o... |
3675 |
static void shmem_free_in_core_inode(struct inode *inode) |
fa0d7e3de fs: icache RCU fr... |
3676 |
{ |
84e710da2 parallel lookups ... |
3677 3678 |
if (S_ISLNK(inode->i_mode)) kfree(inode->i_link); |
fa0d7e3de fs: icache RCU fr... |
3679 3680 |
kmem_cache_free(shmem_inode_cachep, SHMEM_I(inode)); } |
1da177e4c Linux-2.6.12-rc2 |
3681 3682 |
static void shmem_destroy_inode(struct inode *inode) { |
09208d150 shmem, ramfs: pro... |
3683 |
if (S_ISREG(inode->i_mode)) |
1da177e4c Linux-2.6.12-rc2 |
3684 |
mpol_free_shared_policy(&SHMEM_I(inode)->policy); |
1da177e4c Linux-2.6.12-rc2 |
3685 |
} |
41ffe5d5c tmpfs: miscellane... |
3686 |
static void shmem_init_inode(void *foo) |
1da177e4c Linux-2.6.12-rc2 |
3687 |
{ |
41ffe5d5c tmpfs: miscellane... |
3688 3689 |
struct shmem_inode_info *info = foo; inode_init_once(&info->vfs_inode); |
1da177e4c Linux-2.6.12-rc2 |
3690 |
} |
9a8ec03ed shmem: convert sh... |
3691 |
static void shmem_init_inodecache(void) |
1da177e4c Linux-2.6.12-rc2 |
3692 3693 3694 |
{ shmem_inode_cachep = kmem_cache_create("shmem_inode_cache", sizeof(struct shmem_inode_info), |
5d097056c kmemcg: account c... |
3695 |
0, SLAB_PANIC|SLAB_ACCOUNT, shmem_init_inode); |
1da177e4c Linux-2.6.12-rc2 |
3696 |
} |
41ffe5d5c tmpfs: miscellane... |
3697 |
static void shmem_destroy_inodecache(void) |
1da177e4c Linux-2.6.12-rc2 |
3698 |
{ |
1a1d92c10 [PATCH] Really ig... |
3699 |
kmem_cache_destroy(shmem_inode_cachep); |
1da177e4c Linux-2.6.12-rc2 |
3700 |
} |
f5e54d6e5 [PATCH] mark addr... |
3701 |
static const struct address_space_operations shmem_aops = { |
1da177e4c Linux-2.6.12-rc2 |
3702 |
.writepage = shmem_writepage, |
767193253 [PATCH] simplify ... |
3703 |
.set_page_dirty = __set_page_dirty_no_writeback, |
1da177e4c Linux-2.6.12-rc2 |
3704 |
#ifdef CONFIG_TMPFS |
800d15a53 implement simple ... |
3705 3706 |
.write_begin = shmem_write_begin, .write_end = shmem_write_end, |
1da177e4c Linux-2.6.12-rc2 |
3707 |
#endif |
1c93923cc include/linux/mig... |
3708 |
#ifdef CONFIG_MIGRATION |
304dbdb7a [PATCH] add migra... |
3709 |
.migratepage = migrate_page, |
1c93923cc include/linux/mig... |
3710 |
#endif |
aa261f549 HWPOISON: Enable ... |
3711 |
.error_remove_page = generic_error_remove_page, |
1da177e4c Linux-2.6.12-rc2 |
3712 |
}; |
15ad7cdcf [PATCH] struct se... |
3713 |
static const struct file_operations shmem_file_operations = { |
1da177e4c Linux-2.6.12-rc2 |
3714 |
.mmap = shmem_mmap, |
c01d5b300 shmem: get_unmapp... |
3715 |
.get_unmapped_area = shmem_get_unmapped_area, |
1da177e4c Linux-2.6.12-rc2 |
3716 |
#ifdef CONFIG_TMPFS |
220f2ac91 tmpfs: support SE... |
3717 |
.llseek = shmem_file_llseek, |
2ba5bbed0 shmem: switch to ... |
3718 |
.read_iter = shmem_file_read_iter, |
8174202b3 write_iter varian... |
3719 |
.write_iter = generic_file_write_iter, |
1b061d924 rename the generi... |
3720 |
.fsync = noop_fsync, |
82c156f85 switch generic_fi... |
3721 |
.splice_read = generic_file_splice_read, |
f6cb85d00 shmem: switch to ... |
3722 |
.splice_write = iter_file_splice_write, |
83e4fa9c1 tmpfs: support fa... |
3723 |
.fallocate = shmem_fallocate, |
1da177e4c Linux-2.6.12-rc2 |
3724 3725 |
#endif }; |
92e1d5be9 [PATCH] mark stru... |
3726 |
static const struct inode_operations shmem_inode_operations = { |
44a30220b shmem: recalculat... |
3727 |
.getattr = shmem_getattr, |
94c1e62df tmpfs: take contr... |
3728 |
.setattr = shmem_setattr, |
b09e0fa4b tmpfs: implement ... |
3729 |
#ifdef CONFIG_TMPFS_XATTR |
b09e0fa4b tmpfs: implement ... |
3730 |
.listxattr = shmem_listxattr, |
feda821e7 fs: remove generi... |
3731 |
.set_acl = simple_set_acl, |
b09e0fa4b tmpfs: implement ... |
3732 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
3733 |
}; |
92e1d5be9 [PATCH] mark stru... |
3734 |
static const struct inode_operations shmem_dir_inode_operations = { |
1da177e4c Linux-2.6.12-rc2 |
3735 3736 3737 3738 3739 3740 3741 3742 3743 |
#ifdef CONFIG_TMPFS .create = shmem_create, .lookup = simple_lookup, .link = shmem_link, .unlink = shmem_unlink, .symlink = shmem_symlink, .mkdir = shmem_mkdir, .rmdir = shmem_rmdir, .mknod = shmem_mknod, |
2773bf00a fs: rename "renam... |
3744 |
.rename = shmem_rename2, |
60545d0d4 [O_TMPFILE] it's ... |
3745 |
.tmpfile = shmem_tmpfile, |
1da177e4c Linux-2.6.12-rc2 |
3746 |
#endif |
b09e0fa4b tmpfs: implement ... |
3747 |
#ifdef CONFIG_TMPFS_XATTR |
b09e0fa4b tmpfs: implement ... |
3748 |
.listxattr = shmem_listxattr, |
b09e0fa4b tmpfs: implement ... |
3749 |
#endif |
39f0247d3 [PATCH] Access Co... |
3750 |
#ifdef CONFIG_TMPFS_POSIX_ACL |
94c1e62df tmpfs: take contr... |
3751 |
.setattr = shmem_setattr, |
feda821e7 fs: remove generi... |
3752 |
.set_acl = simple_set_acl, |
39f0247d3 [PATCH] Access Co... |
3753 3754 |
#endif }; |
92e1d5be9 [PATCH] mark stru... |
3755 |
static const struct inode_operations shmem_special_inode_operations = { |
b09e0fa4b tmpfs: implement ... |
3756 |
#ifdef CONFIG_TMPFS_XATTR |
b09e0fa4b tmpfs: implement ... |
3757 |
.listxattr = shmem_listxattr, |
b09e0fa4b tmpfs: implement ... |
3758 |
#endif |
39f0247d3 [PATCH] Access Co... |
3759 |
#ifdef CONFIG_TMPFS_POSIX_ACL |
94c1e62df tmpfs: take contr... |
3760 |
.setattr = shmem_setattr, |
feda821e7 fs: remove generi... |
3761 |
.set_acl = simple_set_acl, |
39f0247d3 [PATCH] Access Co... |
3762 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
3763 |
}; |
759b9775c [PATCH] shmem and... |
3764 |
static const struct super_operations shmem_ops = { |
1da177e4c Linux-2.6.12-rc2 |
3765 |
.alloc_inode = shmem_alloc_inode, |
74b1da564 shmem: make use o... |
3766 |
.free_inode = shmem_free_in_core_inode, |
1da177e4c Linux-2.6.12-rc2 |
3767 3768 3769 |
.destroy_inode = shmem_destroy_inode, #ifdef CONFIG_TMPFS .statfs = shmem_statfs, |
680d794ba mount options: fi... |
3770 |
.show_options = shmem_show_options, |
1da177e4c Linux-2.6.12-rc2 |
3771 |
#endif |
1f895f75d switch shmem.c to... |
3772 |
.evict_inode = shmem_evict_inode, |
1da177e4c Linux-2.6.12-rc2 |
3773 3774 |
.drop_inode = generic_delete_inode, .put_super = shmem_put_super, |
396bcc529 mm: remove CONFIG... |
3775 |
#ifdef CONFIG_TRANSPARENT_HUGEPAGE |
779750d20 shmem: split huge... |
3776 3777 3778 |
.nr_cached_objects = shmem_unused_huge_count, .free_cached_objects = shmem_unused_huge_scan, #endif |
1da177e4c Linux-2.6.12-rc2 |
3779 |
}; |
f0f37e2f7 const: mark struc... |
3780 |
static const struct vm_operations_struct shmem_vm_ops = { |
54cb8821d mm: merge populat... |
3781 |
.fault = shmem_fault, |
d7c175517 mm: implement ->m... |
3782 |
.map_pages = filemap_map_pages, |
1da177e4c Linux-2.6.12-rc2 |
3783 3784 3785 3786 3787 |
#ifdef CONFIG_NUMA .set_policy = shmem_set_policy, .get_policy = shmem_get_policy, #endif }; |
f32356261 vfs: Convert ramf... |
3788 |
int shmem_init_fs_context(struct fs_context *fc) |
1da177e4c Linux-2.6.12-rc2 |
3789 |
{ |
f32356261 vfs: Convert ramf... |
3790 3791 3792 3793 3794 3795 3796 3797 3798 3799 3800 3801 3802 |
struct shmem_options *ctx; ctx = kzalloc(sizeof(struct shmem_options), GFP_KERNEL); if (!ctx) return -ENOMEM; ctx->mode = 0777 | S_ISVTX; ctx->uid = current_fsuid(); ctx->gid = current_fsgid(); fc->fs_private = ctx; fc->ops = &shmem_fs_context_ops; return 0; |
1da177e4c Linux-2.6.12-rc2 |
3803 |
} |
41ffe5d5c tmpfs: miscellane... |
3804 |
static struct file_system_type shmem_fs_type = { |
1da177e4c Linux-2.6.12-rc2 |
3805 3806 |
.owner = THIS_MODULE, .name = "tmpfs", |
f32356261 vfs: Convert ramf... |
3807 3808 |
.init_fs_context = shmem_init_fs_context, #ifdef CONFIG_TMPFS |
d7167b149 fs_parse: fold fs... |
3809 |
.parameters = shmem_fs_parameters, |
f32356261 vfs: Convert ramf... |
3810 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
3811 |
.kill_sb = kill_litter_super, |
01c702670 fs: add a filesys... |
3812 |
.fs_flags = FS_USERNS_MOUNT | FS_THP_SUPPORT, |
1da177e4c Linux-2.6.12-rc2 |
3813 |
}; |
1da177e4c Linux-2.6.12-rc2 |
3814 |
|
41ffe5d5c tmpfs: miscellane... |
3815 |
int __init shmem_init(void) |
1da177e4c Linux-2.6.12-rc2 |
3816 3817 |
{ int error; |
9a8ec03ed shmem: convert sh... |
3818 |
shmem_init_inodecache(); |
1da177e4c Linux-2.6.12-rc2 |
3819 |
|
41ffe5d5c tmpfs: miscellane... |
3820 |
error = register_filesystem(&shmem_fs_type); |
1da177e4c Linux-2.6.12-rc2 |
3821 |
if (error) { |
1170532bb mm: convert print... |
3822 3823 |
pr_err("Could not register tmpfs "); |
1da177e4c Linux-2.6.12-rc2 |
3824 3825 |
goto out2; } |
95dc112a5 [PATCH] devfs: Re... |
3826 |
|
ca4e05195 shm_mnt is as lon... |
3827 |
shm_mnt = kern_mount(&shmem_fs_type); |
1da177e4c Linux-2.6.12-rc2 |
3828 3829 |
if (IS_ERR(shm_mnt)) { error = PTR_ERR(shm_mnt); |
1170532bb mm: convert print... |
3830 3831 |
pr_err("Could not kern_mount tmpfs "); |
1da177e4c Linux-2.6.12-rc2 |
3832 3833 |
goto out1; } |
5a6e75f81 shmem: prepare hu... |
3834 |
|
396bcc529 mm: remove CONFIG... |
3835 |
#ifdef CONFIG_TRANSPARENT_HUGEPAGE |
435c0b87d mm, shmem: fix ha... |
3836 |
if (has_transparent_hugepage() && shmem_huge > SHMEM_HUGE_DENY) |
5a6e75f81 shmem: prepare hu... |
3837 3838 3839 3840 |
SHMEM_SB(shm_mnt->mnt_sb)->huge = shmem_huge; else shmem_huge = 0; /* just in case it was patched */ #endif |
1da177e4c Linux-2.6.12-rc2 |
3841 3842 3843 |
return 0; out1: |
41ffe5d5c tmpfs: miscellane... |
3844 |
unregister_filesystem(&shmem_fs_type); |
1da177e4c Linux-2.6.12-rc2 |
3845 |
out2: |
41ffe5d5c tmpfs: miscellane... |
3846 |
shmem_destroy_inodecache(); |
1da177e4c Linux-2.6.12-rc2 |
3847 3848 3849 |
shm_mnt = ERR_PTR(error); return error; } |
853ac43ab shmem: unify regu... |
3850 |
|
396bcc529 mm: remove CONFIG... |
3851 |
#if defined(CONFIG_TRANSPARENT_HUGEPAGE) && defined(CONFIG_SYSFS) |
5a6e75f81 shmem: prepare hu... |
3852 3853 3854 |
static ssize_t shmem_enabled_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { |
26083eb6b mm/shmem.c: make ... |
3855 |
static const int values[] = { |
5a6e75f81 shmem: prepare hu... |
3856 3857 3858 3859 3860 3861 3862 3863 3864 3865 3866 3867 3868 3869 3870 3871 3872 3873 3874 3875 3876 3877 3878 3879 3880 3881 3882 3883 3884 3885 3886 3887 3888 3889 3890 3891 3892 3893 3894 3895 3896 3897 |
SHMEM_HUGE_ALWAYS, SHMEM_HUGE_WITHIN_SIZE, SHMEM_HUGE_ADVISE, SHMEM_HUGE_NEVER, SHMEM_HUGE_DENY, SHMEM_HUGE_FORCE, }; int i, count; for (i = 0, count = 0; i < ARRAY_SIZE(values); i++) { const char *fmt = shmem_huge == values[i] ? "[%s] " : "%s "; count += sprintf(buf + count, fmt, shmem_format_huge(values[i])); } buf[count - 1] = ' '; return count; } static ssize_t shmem_enabled_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { char tmp[16]; int huge; if (count + 1 > sizeof(tmp)) return -EINVAL; memcpy(tmp, buf, count); tmp[count] = '\0'; if (count && tmp[count - 1] == ' ') tmp[count - 1] = '\0'; huge = shmem_parse_huge(tmp); if (huge == -EINVAL) return -EINVAL; if (!has_transparent_hugepage() && huge != SHMEM_HUGE_NEVER && huge != SHMEM_HUGE_DENY) return -EINVAL; shmem_huge = huge; |
435c0b87d mm, shmem: fix ha... |
3898 |
if (shmem_huge > SHMEM_HUGE_DENY) |
5a6e75f81 shmem: prepare hu... |
3899 3900 3901 3902 3903 3904 |
SHMEM_SB(shm_mnt->mnt_sb)->huge = shmem_huge; return count; } struct kobj_attribute shmem_enabled_attr = __ATTR(shmem_enabled, 0644, shmem_enabled_show, shmem_enabled_store); |
396bcc529 mm: remove CONFIG... |
3905 |
#endif /* CONFIG_TRANSPARENT_HUGEPAGE && CONFIG_SYSFS */ |
f3f0e1d21 khugepaged: add s... |
3906 |
|
396bcc529 mm: remove CONFIG... |
3907 |
#ifdef CONFIG_TRANSPARENT_HUGEPAGE |
f3f0e1d21 khugepaged: add s... |
3908 3909 3910 3911 3912 3913 |
bool shmem_huge_enabled(struct vm_area_struct *vma) { struct inode *inode = file_inode(vma->vm_file); struct shmem_sb_info *sbinfo = SHMEM_SB(inode->i_sb); loff_t i_size; pgoff_t off; |
c06306696 mm: thp: fix fals... |
3914 3915 3916 |
if ((vma->vm_flags & VM_NOHUGEPAGE) || test_bit(MMF_DISABLE_THP, &vma->vm_mm->flags)) return false; |
f3f0e1d21 khugepaged: add s... |
3917 3918 3919 3920 3921 3922 3923 3924 3925 3926 3927 3928 3929 3930 3931 |
if (shmem_huge == SHMEM_HUGE_FORCE) return true; if (shmem_huge == SHMEM_HUGE_DENY) return false; switch (sbinfo->huge) { case SHMEM_HUGE_NEVER: return false; case SHMEM_HUGE_ALWAYS: return true; case SHMEM_HUGE_WITHIN_SIZE: off = round_up(vma->vm_pgoff, HPAGE_PMD_NR); i_size = round_up(i_size_read(inode), PAGE_SIZE); if (i_size >= HPAGE_PMD_SIZE && i_size >> PAGE_SHIFT >= off) return true; |
e4a9bc589 mm: use fallthrough; |
3932 |
fallthrough; |
f3f0e1d21 khugepaged: add s... |
3933 3934 3935 3936 3937 3938 3939 3940 |
case SHMEM_HUGE_ADVISE: /* TODO: implement fadvise() hints */ return (vma->vm_flags & VM_HUGEPAGE); default: VM_BUG_ON(1); return false; } } |
396bcc529 mm: remove CONFIG... |
3941 |
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
5a6e75f81 shmem: prepare hu... |
3942 |
|
853ac43ab shmem: unify regu... |
3943 3944 3945 3946 3947 3948 3949 3950 3951 3952 |
#else /* !CONFIG_SHMEM */ /* * tiny-shmem: simple shmemfs and tmpfs using ramfs code * * This is intended for small system where the benefits of the full * shmem code (swap-backed and resource-limited) are outweighed by * their complexity. On systems without swap this code should be * effectively equivalent, but much lighter weight. */ |
41ffe5d5c tmpfs: miscellane... |
3953 |
static struct file_system_type shmem_fs_type = { |
853ac43ab shmem: unify regu... |
3954 |
.name = "tmpfs", |
f32356261 vfs: Convert ramf... |
3955 |
.init_fs_context = ramfs_init_fs_context, |
d7167b149 fs_parse: fold fs... |
3956 |
.parameters = ramfs_fs_parameters, |
853ac43ab shmem: unify regu... |
3957 |
.kill_sb = kill_litter_super, |
2b8576cb0 userns: Allow the... |
3958 |
.fs_flags = FS_USERNS_MOUNT, |
853ac43ab shmem: unify regu... |
3959 |
}; |
41ffe5d5c tmpfs: miscellane... |
3960 |
int __init shmem_init(void) |
853ac43ab shmem: unify regu... |
3961 |
{ |
41ffe5d5c tmpfs: miscellane... |
3962 |
BUG_ON(register_filesystem(&shmem_fs_type) != 0); |
853ac43ab shmem: unify regu... |
3963 |
|
41ffe5d5c tmpfs: miscellane... |
3964 |
shm_mnt = kern_mount(&shmem_fs_type); |
853ac43ab shmem: unify regu... |
3965 3966 3967 3968 |
BUG_ON(IS_ERR(shm_mnt)); return 0; } |
b56a2d8af mm: rid swapoff o... |
3969 3970 |
int shmem_unuse(unsigned int type, bool frontswap, unsigned long *fs_pages_to_unuse) |
853ac43ab shmem: unify regu... |
3971 3972 3973 |
{ return 0; } |
3f96b79ad tmpfs: depend on ... |
3974 3975 3976 3977 |
int shmem_lock(struct file *file, int lock, struct user_struct *user) { return 0; } |
245132643 SHM_UNLOCK: fix U... |
3978 3979 3980 |
void shmem_unlock_mapping(struct address_space *mapping) { } |
c01d5b300 shmem: get_unmapp... |
3981 3982 3983 3984 3985 3986 3987 3988 |
#ifdef CONFIG_MMU unsigned long shmem_get_unmapped_area(struct file *file, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags) { return current->mm->get_unmapped_area(file, addr, len, pgoff, flags); } #endif |
41ffe5d5c tmpfs: miscellane... |
3989 |
void shmem_truncate_range(struct inode *inode, loff_t lstart, loff_t lend) |
94c1e62df tmpfs: take contr... |
3990 |
{ |
41ffe5d5c tmpfs: miscellane... |
3991 |
truncate_inode_pages_range(inode->i_mapping, lstart, lend); |
94c1e62df tmpfs: take contr... |
3992 3993 |
} EXPORT_SYMBOL_GPL(shmem_truncate_range); |
0b0a0806b shmem: fix shared... |
3994 3995 |
#define shmem_vm_ops generic_file_vm_ops #define shmem_file_operations ramfs_file_operations |
454abafe9 ramfs: replace in... |
3996 |
#define shmem_get_inode(sb, dir, mode, dev, flags) ramfs_get_inode(sb, dir, mode, dev) |
0b0a0806b shmem: fix shared... |
3997 3998 |
#define shmem_acct_size(flags, size) 0 #define shmem_unacct_size(flags, size) do {} while (0) |
853ac43ab shmem: unify regu... |
3999 4000 4001 4002 |
#endif /* CONFIG_SHMEM */ /* common code */ |
1da177e4c Linux-2.6.12-rc2 |
4003 |
|
703321b60 mm/shmem: introdu... |
4004 |
static struct file *__shmem_file_setup(struct vfsmount *mnt, const char *name, loff_t size, |
c72770909 security: shmem: ... |
4005 |
unsigned long flags, unsigned int i_flags) |
1da177e4c Linux-2.6.12-rc2 |
4006 |
{ |
1da177e4c Linux-2.6.12-rc2 |
4007 |
struct inode *inode; |
93dec2da7 ... and switch sh... |
4008 |
struct file *res; |
1da177e4c Linux-2.6.12-rc2 |
4009 |
|
703321b60 mm/shmem: introdu... |
4010 4011 |
if (IS_ERR(mnt)) return ERR_CAST(mnt); |
1da177e4c Linux-2.6.12-rc2 |
4012 |
|
285b2c4fd tmpfs: demolish o... |
4013 |
if (size < 0 || size > MAX_LFS_FILESIZE) |
1da177e4c Linux-2.6.12-rc2 |
4014 4015 4016 4017 |
return ERR_PTR(-EINVAL); if (shmem_acct_size(flags, size)) return ERR_PTR(-ENOMEM); |
93dec2da7 ... and switch sh... |
4018 4019 |
inode = shmem_get_inode(mnt->mnt_sb, NULL, S_IFREG | S_IRWXUGO, 0, flags); |
dac2d1f6c __shmem_file_setu... |
4020 4021 4022 4023 |
if (unlikely(!inode)) { shmem_unacct_size(flags, size); return ERR_PTR(-ENOSPC); } |
c72770909 security: shmem: ... |
4024 |
inode->i_flags |= i_flags; |
1da177e4c Linux-2.6.12-rc2 |
4025 |
inode->i_size = size; |
6d6b77f16 filesystems: add ... |
4026 |
clear_nlink(inode); /* It is unlinked */ |
26567cdbb fix nommu breakag... |
4027 |
res = ERR_PTR(ramfs_nommu_expand_for_mapping(inode, size)); |
93dec2da7 ... and switch sh... |
4028 4029 4030 |
if (!IS_ERR(res)) res = alloc_file_pseudo(inode, mnt, name, O_RDWR, &shmem_file_operations); |
26567cdbb fix nommu breakag... |
4031 |
if (IS_ERR(res)) |
93dec2da7 ... and switch sh... |
4032 |
iput(inode); |
6b4d0b279 clean shmem_file_... |
4033 |
return res; |
1da177e4c Linux-2.6.12-rc2 |
4034 |
} |
c72770909 security: shmem: ... |
4035 4036 4037 4038 4039 |
/** * shmem_kernel_file_setup - get an unlinked file living in tmpfs which must be * kernel internal. There will be NO LSM permission checks against the * underlying inode. So users of this interface must do LSM checks at a |
e1832f292 ipc: use private ... |
4040 4041 |
* higher layer. The users are the big_key and shm implementations. LSM * checks are provided at the key or shm level rather than the inode. |
c72770909 security: shmem: ... |
4042 4043 4044 4045 4046 4047 |
* @name: name for dentry (to be seen in /proc/<pid>/maps * @size: size to be set for the file * @flags: VM_NORESERVE suppresses pre-accounting of the entire object size */ struct file *shmem_kernel_file_setup(const char *name, loff_t size, unsigned long flags) { |
703321b60 mm/shmem: introdu... |
4048 |
return __shmem_file_setup(shm_mnt, name, size, flags, S_PRIVATE); |
c72770909 security: shmem: ... |
4049 4050 4051 4052 4053 4054 4055 4056 4057 4058 |
} /** * shmem_file_setup - get an unlinked file living in tmpfs * @name: name for dentry (to be seen in /proc/<pid>/maps * @size: size to be set for the file * @flags: VM_NORESERVE suppresses pre-accounting of the entire object size */ struct file *shmem_file_setup(const char *name, loff_t size, unsigned long flags) { |
703321b60 mm/shmem: introdu... |
4059 |
return __shmem_file_setup(shm_mnt, name, size, flags, 0); |
c72770909 security: shmem: ... |
4060 |
} |
395e0ddc4 Export shmem_file... |
4061 |
EXPORT_SYMBOL_GPL(shmem_file_setup); |
1da177e4c Linux-2.6.12-rc2 |
4062 |
|
467118102 mm/shmem and tiny... |
4063 |
/** |
703321b60 mm/shmem: introdu... |
4064 4065 4066 4067 4068 4069 4070 4071 4072 4073 4074 4075 4076 4077 |
* shmem_file_setup_with_mnt - get an unlinked file living in tmpfs * @mnt: the tmpfs mount where the file will be created * @name: name for dentry (to be seen in /proc/<pid>/maps * @size: size to be set for the file * @flags: VM_NORESERVE suppresses pre-accounting of the entire object size */ struct file *shmem_file_setup_with_mnt(struct vfsmount *mnt, const char *name, loff_t size, unsigned long flags) { return __shmem_file_setup(mnt, name, size, flags, 0); } EXPORT_SYMBOL_GPL(shmem_file_setup_with_mnt); /** |
1da177e4c Linux-2.6.12-rc2 |
4078 |
* shmem_zero_setup - setup a shared anonymous mapping |
45e55300f mm: remove unnece... |
4079 |
* @vma: the vma to be mmapped is prepared by do_mmap |
1da177e4c Linux-2.6.12-rc2 |
4080 4081 4082 4083 4084 |
*/ int shmem_zero_setup(struct vm_area_struct *vma) { struct file *file; loff_t size = vma->vm_end - vma->vm_start; |
66fc13039 mm: shmem_zero_se... |
4085 |
/* |
c1e8d7c6a mmap locking API:... |
4086 |
* Cloning a new file under mmap_lock leads to a lock ordering conflict |
66fc13039 mm: shmem_zero_se... |
4087 4088 4089 4090 |
* between XFS directory reading and selinux: since this file is only * accessible to the user through its mapping, use S_PRIVATE flag to * bypass file security, in the same way as shmem_kernel_file_setup(). */ |
703321b60 mm/shmem: introdu... |
4091 |
file = shmem_kernel_file_setup("dev/zero", size, vma->vm_flags); |
1da177e4c Linux-2.6.12-rc2 |
4092 4093 4094 4095 4096 4097 4098 |
if (IS_ERR(file)) return PTR_ERR(file); if (vma->vm_file) fput(vma->vm_file); vma->vm_file = file; vma->vm_ops = &shmem_vm_ops; |
f3f0e1d21 khugepaged: add s... |
4099 |
|
396bcc529 mm: remove CONFIG... |
4100 |
if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE) && |
f3f0e1d21 khugepaged: add s... |
4101 4102 4103 4104 |
((vma->vm_start + ~HPAGE_PMD_MASK) & HPAGE_PMD_MASK) < (vma->vm_end & HPAGE_PMD_MASK)) { khugepaged_enter(vma, vma->vm_flags); } |
1da177e4c Linux-2.6.12-rc2 |
4105 4106 |
return 0; } |
d9d90e5eb tmpfs: add shmem_... |
4107 4108 4109 4110 4111 4112 4113 4114 4115 4116 4117 4118 4119 |
/** * shmem_read_mapping_page_gfp - read into page cache, using specified page allocation flags. * @mapping: the page's address_space * @index: the page index * @gfp: the page allocator flags to use if allocating * * This behaves as a tmpfs "read_cache_page_gfp(mapping, index, gfp)", * with any new page allocations done using the specified allocation flags. * But read_cache_page_gfp() uses the ->readpage() method: which does not * suit tmpfs, since it may have pages in swapcache, and needs to find those * for itself; although drivers/gpu/drm i915 and ttm rely upon this support. * |
68da9f055 tmpfs: pass gfp t... |
4120 4121 |
* i915_gem_object_get_pages_gtt() mixes __GFP_NORETRY | __GFP_NOWARN in * with the mapping_gfp_mask(), to avoid OOMing the machine unnecessarily. |
d9d90e5eb tmpfs: add shmem_... |
4122 4123 4124 4125 |
*/ struct page *shmem_read_mapping_page_gfp(struct address_space *mapping, pgoff_t index, gfp_t gfp) { |
68da9f055 tmpfs: pass gfp t... |
4126 4127 |
#ifdef CONFIG_SHMEM struct inode *inode = mapping->host; |
9276aad6c tmpfs: remove_shm... |
4128 |
struct page *page; |
68da9f055 tmpfs: pass gfp t... |
4129 4130 4131 |
int error; BUG_ON(mapping->a_ops != &shmem_aops); |
9e18eb293 tmpfs: mem_cgroup... |
4132 |
error = shmem_getpage_gfp(inode, index, &page, SGP_CACHE, |
cfda05267 userfaultfd: shme... |
4133 |
gfp, NULL, NULL, NULL); |
68da9f055 tmpfs: pass gfp t... |
4134 4135 4136 4137 4138 4139 4140 4141 4142 |
if (error) page = ERR_PTR(error); else unlock_page(page); return page; #else /* * The tiny !SHMEM case uses ramfs without swap */ |
d9d90e5eb tmpfs: add shmem_... |
4143 |
return read_cache_page_gfp(mapping, index, gfp); |
68da9f055 tmpfs: pass gfp t... |
4144 |
#endif |
d9d90e5eb tmpfs: add shmem_... |
4145 4146 |
} EXPORT_SYMBOL_GPL(shmem_read_mapping_page_gfp); |