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mm/shmem.c
63.8 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/pagemap.h> |
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#include <linux/file.h> #include <linux/mm.h> |
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#include <linux/export.h> |
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#include <linux/swap.h> 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/generic_acl.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/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 <asm/uaccess.h> |
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#include <asm/pgtable.h> |
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#define BLOCKS_PER_PAGE (PAGE_CACHE_SIZE/512) |
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#define VM_ACCT(size) (PAGE_CACHE_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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struct shmem_xattr { struct list_head list; /* anchored by shmem_inode_info->xattr_list */ char *name; /* xattr name */ size_t size; char value[0]; }; |
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/* Flag allocation requirements to shmem_getpage */ |
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enum sgp_type { |
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SGP_READ, /* don't exceed i_size, don't allocate page */ SGP_CACHE, /* don't exceed i_size, may allocate page */ |
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SGP_DIRTY, /* like SGP_CACHE, but set new page dirty */ |
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SGP_WRITE, /* may exceed i_size, may allocate page */ }; |
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#ifdef CONFIG_TMPFS |
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static unsigned long shmem_default_max_blocks(void) { return totalram_pages / 2; } static unsigned long shmem_default_max_inodes(void) { return min(totalram_pages - totalhigh_pages, totalram_pages / 2); } |
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#endif |
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static int shmem_getpage_gfp(struct inode *inode, pgoff_t index, struct page **pagep, enum sgp_type sgp, gfp_t gfp, int *fault_type); static inline int shmem_getpage(struct inode *inode, pgoff_t index, struct page **pagep, enum sgp_type sgp, int *fault_type) { return shmem_getpage_gfp(inode, index, pagep, sgp, mapping_gfp_mask(inode->i_mapping), fault_type); } |
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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) ? 0 : security_vm_enough_memory_kern(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)); } /* * ... whereas tmpfs objects are accounted incrementally as * pages are allocated, in order to allow huge sparse files. * 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. */ static inline int shmem_acct_block(unsigned long flags) { |
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return (flags & VM_NORESERVE) ? security_vm_enough_memory_kern(VM_ACCT(PAGE_CACHE_SIZE)) : 0; |
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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_CACHE_SIZE)); } |
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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 backing_dev_info shmem_backing_dev_info __read_mostly = { |
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.ra_pages = 0, /* No readahead */ |
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.capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK | BDI_CAP_SWAP_BACKED, |
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}; static LIST_HEAD(shmem_swaplist); |
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static DEFINE_MUTEX(shmem_swaplist_mutex); |
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static int shmem_reserve_inode(struct super_block *sb) { struct shmem_sb_info *sbinfo = SHMEM_SB(sb); if (sbinfo->max_inodes) { spin_lock(&sbinfo->stat_lock); if (!sbinfo->free_inodes) { spin_unlock(&sbinfo->stat_lock); return -ENOSPC; } sbinfo->free_inodes--; spin_unlock(&sbinfo->stat_lock); } 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) { |
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struct shmem_sb_info *sbinfo = SHMEM_SB(inode->i_sb); if (sbinfo->max_blocks) percpu_counter_add(&sbinfo->used_blocks, -freed); |
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info->alloced -= freed; |
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inode->i_blocks -= freed * BLOCKS_PER_PAGE; |
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shmem_unacct_blocks(info->flags, freed); |
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} } |
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/* * Replace item expected in radix tree by a new item, while holding tree lock. */ static int shmem_radix_tree_replace(struct address_space *mapping, pgoff_t index, void *expected, void *replacement) { void **pslot; void *item = NULL; VM_BUG_ON(!expected); pslot = radix_tree_lookup_slot(&mapping->page_tree, index); if (pslot) item = radix_tree_deref_slot_protected(pslot, &mapping->tree_lock); if (item != expected) return -ENOENT; if (replacement) radix_tree_replace_slot(pslot, replacement); else radix_tree_delete(&mapping->page_tree, index); return 0; } /* |
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* 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, pgoff_t index, gfp_t gfp, void *expected) { |
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int error = 0; |
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VM_BUG_ON(!PageLocked(page)); VM_BUG_ON(!PageSwapBacked(page)); |
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if (!expected) error = radix_tree_preload(gfp & GFP_RECLAIM_MASK); if (!error) { page_cache_get(page); page->mapping = mapping; page->index = index; spin_lock_irq(&mapping->tree_lock); if (!expected) error = radix_tree_insert(&mapping->page_tree, index, page); else error = shmem_radix_tree_replace(mapping, index, expected, page); if (!error) { mapping->nrpages++; __inc_zone_page_state(page, NR_FILE_PAGES); __inc_zone_page_state(page, NR_SHMEM); spin_unlock_irq(&mapping->tree_lock); } else { page->mapping = NULL; spin_unlock_irq(&mapping->tree_lock); page_cache_release(page); } if (!expected) radix_tree_preload_end(); } if (error) mem_cgroup_uncharge_cache_page(page); |
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return error; } /* |
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* 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; spin_lock_irq(&mapping->tree_lock); error = shmem_radix_tree_replace(mapping, page->index, page, radswap); page->mapping = NULL; mapping->nrpages--; __dec_zone_page_state(page, NR_FILE_PAGES); __dec_zone_page_state(page, NR_SHMEM); spin_unlock_irq(&mapping->tree_lock); page_cache_release(page); BUG_ON(error); } /* |
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* Like find_get_pages, but collecting swap entries as well as pages. */ static unsigned shmem_find_get_pages_and_swap(struct address_space *mapping, pgoff_t start, unsigned int nr_pages, struct page **pages, pgoff_t *indices) { unsigned int i; unsigned int ret; unsigned int nr_found; rcu_read_lock(); restart: nr_found = radix_tree_gang_lookup_slot(&mapping->page_tree, (void ***)pages, indices, start, nr_pages); ret = 0; for (i = 0; i < nr_found; i++) { struct page *page; repeat: page = radix_tree_deref_slot((void **)pages[i]); if (unlikely(!page)) continue; if (radix_tree_exception(page)) { |
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if (radix_tree_deref_retry(page)) goto restart; /* * Otherwise, we must be storing a swap entry * here as an exceptional entry: so return it * without attempting to raise page count. */ goto export; |
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} if (!page_cache_get_speculative(page)) goto repeat; /* Has the page moved? */ if (unlikely(page != *((void **)pages[i]))) { page_cache_release(page); goto repeat; } export: indices[ret] = indices[i]; pages[ret] = page; ret++; } if (unlikely(!ret && nr_found)) goto restart; rcu_read_unlock(); return ret; } /* * Remove swap entry from radix tree, free the swap and its page cache. */ static int shmem_free_swap(struct address_space *mapping, pgoff_t index, void *radswap) { int error; spin_lock_irq(&mapping->tree_lock); error = shmem_radix_tree_replace(mapping, index, radswap, NULL); spin_unlock_irq(&mapping->tree_lock); if (!error) free_swap_and_cache(radix_to_swp_entry(radswap)); return error; } /* * Pagevec may contain swap entries, so shuffle up pages before releasing. */ static void shmem_pagevec_release(struct pagevec *pvec) { int i, j; for (i = 0, j = 0; i < pagevec_count(pvec); i++) { struct page *page = pvec->pages[i]; if (!radix_tree_exceptional_entry(page)) pvec->pages[j++] = page; } pvec->nr = j; pagevec_release(pvec); } /* * Remove range of pages and swap entries from radix tree, and free them. */ |
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void shmem_truncate_range(struct inode *inode, loff_t lstart, loff_t lend) |
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{ |
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struct address_space *mapping = inode->i_mapping; |
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struct shmem_inode_info *info = SHMEM_I(inode); |
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pgoff_t start = (lstart + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; |
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unsigned partial = lstart & (PAGE_CACHE_SIZE - 1); |
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pgoff_t end = (lend >> PAGE_CACHE_SHIFT); |
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struct pagevec pvec; |
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pgoff_t indices[PAGEVEC_SIZE]; long nr_swaps_freed = 0; |
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pgoff_t index; |
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int i; BUG_ON((lend & (PAGE_CACHE_SIZE - 1)) != (PAGE_CACHE_SIZE - 1)); pagevec_init(&pvec, 0); index = start; |
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while (index <= end) { pvec.nr = shmem_find_get_pages_and_swap(mapping, index, min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1, pvec.pages, indices); if (!pvec.nr) break; |
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mem_cgroup_uncharge_start(); for (i = 0; i < pagevec_count(&pvec); i++) { struct page *page = pvec.pages[i]; |
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index = indices[i]; |
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if (index > end) break; |
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if (radix_tree_exceptional_entry(page)) { nr_swaps_freed += !shmem_free_swap(mapping, index, page); |
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continue; |
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} if (!trylock_page(page)) |
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continue; |
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if (page->mapping == mapping) { VM_BUG_ON(PageWriteback(page)); truncate_inode_page(mapping, page); |
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} |
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unlock_page(page); } |
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shmem_pagevec_release(&pvec); |
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mem_cgroup_uncharge_end(); cond_resched(); index++; } |
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|
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if (partial) { struct page *page = NULL; shmem_getpage(inode, start - 1, &page, SGP_READ, NULL); if (page) { zero_user_segment(page, partial, PAGE_CACHE_SIZE); set_page_dirty(page); unlock_page(page); page_cache_release(page); } } index = start; for ( ; ; ) { cond_resched(); |
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pvec.nr = shmem_find_get_pages_and_swap(mapping, index, min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1, pvec.pages, indices); if (!pvec.nr) { |
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if (index == start) break; index = start; continue; } |
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if (index == start && indices[0] > end) { shmem_pagevec_release(&pvec); |
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break; } mem_cgroup_uncharge_start(); for (i = 0; i < pagevec_count(&pvec); i++) { struct page *page = pvec.pages[i]; |
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index = indices[i]; |
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if (index > end) break; |
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if (radix_tree_exceptional_entry(page)) { nr_swaps_freed += !shmem_free_swap(mapping, index, page); continue; } |
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lock_page(page); |
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if (page->mapping == mapping) { VM_BUG_ON(PageWriteback(page)); truncate_inode_page(mapping, page); } |
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unlock_page(page); } |
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shmem_pagevec_release(&pvec); |
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mem_cgroup_uncharge_end(); index++; } |
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spin_lock(&info->lock); |
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info->swapped -= nr_swaps_freed; |
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shmem_recalc_inode(inode); spin_unlock(&info->lock); |
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inode->i_ctime = inode->i_mtime = CURRENT_TIME; |
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} |
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EXPORT_SYMBOL_GPL(shmem_truncate_range); |
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static int shmem_setattr(struct dentry *dentry, struct iattr *attr) |
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{ struct inode *inode = dentry->d_inode; |
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int error; |
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error = inode_change_ok(inode, attr); if (error) return error; |
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if (S_ISREG(inode->i_mode) && (attr->ia_valid & ATTR_SIZE)) { loff_t oldsize = inode->i_size; loff_t newsize = attr->ia_size; |
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if (newsize != oldsize) { i_size_write(inode, newsize); inode->i_ctime = inode->i_mtime = CURRENT_TIME; } if (newsize < oldsize) { loff_t holebegin = round_up(newsize, PAGE_SIZE); unmap_mapping_range(inode->i_mapping, holebegin, 0, 1); shmem_truncate_range(inode, newsize, (loff_t)-1); /* unmap again to remove racily COWed private pages */ unmap_mapping_range(inode->i_mapping, holebegin, 0, 1); } |
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} |
db78b877f always call inode... |
516 |
setattr_copy(inode, attr); |
39f0247d3 [PATCH] Access Co... |
517 |
#ifdef CONFIG_TMPFS_POSIX_ACL |
db78b877f always call inode... |
518 |
if (attr->ia_valid & ATTR_MODE) |
1c7c474c3 make generic_acl ... |
519 |
error = generic_acl_chmod(inode); |
39f0247d3 [PATCH] Access Co... |
520 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
521 522 |
return error; } |
1f895f75d switch shmem.c to... |
523 |
static void shmem_evict_inode(struct inode *inode) |
1da177e4c Linux-2.6.12-rc2 |
524 |
{ |
1da177e4c Linux-2.6.12-rc2 |
525 |
struct shmem_inode_info *info = SHMEM_I(inode); |
b09e0fa4b tmpfs: implement ... |
526 |
struct shmem_xattr *xattr, *nxattr; |
1da177e4c Linux-2.6.12-rc2 |
527 |
|
3889e6e76 tmpfs: convert to... |
528 |
if (inode->i_mapping->a_ops == &shmem_aops) { |
1da177e4c Linux-2.6.12-rc2 |
529 530 |
shmem_unacct_size(info->flags, inode->i_size); inode->i_size = 0; |
3889e6e76 tmpfs: convert to... |
531 |
shmem_truncate_range(inode, 0, (loff_t)-1); |
1da177e4c Linux-2.6.12-rc2 |
532 |
if (!list_empty(&info->swaplist)) { |
cb5f7b9a4 tmpfs: make shmem... |
533 |
mutex_lock(&shmem_swaplist_mutex); |
1da177e4c Linux-2.6.12-rc2 |
534 |
list_del_init(&info->swaplist); |
cb5f7b9a4 tmpfs: make shmem... |
535 |
mutex_unlock(&shmem_swaplist_mutex); |
1da177e4c Linux-2.6.12-rc2 |
536 |
} |
69f07ec93 tmpfs: use kmemdu... |
537 538 |
} else kfree(info->symlink); |
b09e0fa4b tmpfs: implement ... |
539 540 541 542 543 |
list_for_each_entry_safe(xattr, nxattr, &info->xattr_list, list) { kfree(xattr->name); kfree(xattr); } |
0edd73b33 [PATCH] shmem: re... |
544 |
BUG_ON(inode->i_blocks); |
5b04c6890 shmem: factor out... |
545 |
shmem_free_inode(inode->i_sb); |
1f895f75d switch shmem.c to... |
546 |
end_writeback(inode); |
1da177e4c Linux-2.6.12-rc2 |
547 |
} |
46f65ec15 tmpfs: convert sh... |
548 549 550 |
/* * If swap found in inode, free it and move page from swapcache to filecache. */ |
41ffe5d5c tmpfs: miscellane... |
551 552 |
static int shmem_unuse_inode(struct shmem_inode_info *info, swp_entry_t swap, struct page *page) |
1da177e4c Linux-2.6.12-rc2 |
553 |
{ |
285b2c4fd tmpfs: demolish o... |
554 |
struct address_space *mapping = info->vfs_inode.i_mapping; |
46f65ec15 tmpfs: convert sh... |
555 |
void *radswap; |
41ffe5d5c tmpfs: miscellane... |
556 |
pgoff_t index; |
d9fe526a8 tmpfs: allow file... |
557 |
int error; |
1da177e4c Linux-2.6.12-rc2 |
558 |
|
46f65ec15 tmpfs: convert sh... |
559 |
radswap = swp_to_radix_entry(swap); |
e504f3fdd tmpfs radix_tree:... |
560 |
index = radix_tree_locate_item(&mapping->page_tree, radswap); |
46f65ec15 tmpfs: convert sh... |
561 |
if (index == -1) |
285b2c4fd tmpfs: demolish o... |
562 |
return 0; |
2e0e26c76 tmpfs: open a win... |
563 |
|
1b1b32f2c tmpfs: fix shmem_... |
564 565 |
/* * Move _head_ to start search for next from here. |
1f895f75d switch shmem.c to... |
566 |
* But be careful: shmem_evict_inode checks list_empty without taking |
1b1b32f2c tmpfs: fix shmem_... |
567 |
* mutex, and there's an instant in list_move_tail when info->swaplist |
285b2c4fd tmpfs: demolish o... |
568 |
* would appear empty, if it were the only one on shmem_swaplist. |
1b1b32f2c tmpfs: fix shmem_... |
569 570 571 |
*/ if (shmem_swaplist.next != &info->swaplist) list_move_tail(&shmem_swaplist, &info->swaplist); |
2e0e26c76 tmpfs: open a win... |
572 |
|
d13d14430 memcg: handle swa... |
573 |
/* |
778dd893a tmpfs: fix race b... |
574 575 576 |
* We rely on shmem_swaplist_mutex, not only to protect the swaplist, * but also to hold up shmem_evict_inode(): so inode cannot be freed * beneath us (pagelock doesn't help until the page is in pagecache). |
d13d14430 memcg: handle swa... |
577 |
*/ |
46f65ec15 tmpfs: convert sh... |
578 579 |
error = shmem_add_to_page_cache(page, mapping, index, GFP_NOWAIT, radswap); |
778dd893a tmpfs: fix race b... |
580 |
/* which does mem_cgroup_uncharge_cache_page on error */ |
69029cd55 memcg: remove ref... |
581 |
|
48f170fb7 tmpfs: simplify u... |
582 |
if (error != -ENOMEM) { |
46f65ec15 tmpfs: convert sh... |
583 584 585 586 |
/* * Truncation and eviction use free_swap_and_cache(), which * only does trylock page: if we raced, best clean up here. */ |
73b1262fa tmpfs: move swap ... |
587 588 |
delete_from_swap_cache(page); set_page_dirty(page); |
46f65ec15 tmpfs: convert sh... |
589 590 591 592 593 594 |
if (!error) { spin_lock(&info->lock); info->swapped--; spin_unlock(&info->lock); swap_free(swap); } |
2e0e26c76 tmpfs: open a win... |
595 |
error = 1; /* not an error, but entry was found */ |
1da177e4c Linux-2.6.12-rc2 |
596 |
} |
2e0e26c76 tmpfs: open a win... |
597 |
return error; |
1da177e4c Linux-2.6.12-rc2 |
598 599 600 |
} /* |
46f65ec15 tmpfs: convert sh... |
601 |
* Search through swapped inodes to find and replace swap by page. |
1da177e4c Linux-2.6.12-rc2 |
602 |
*/ |
41ffe5d5c tmpfs: miscellane... |
603 |
int shmem_unuse(swp_entry_t swap, struct page *page) |
1da177e4c Linux-2.6.12-rc2 |
604 |
{ |
41ffe5d5c tmpfs: miscellane... |
605 |
struct list_head *this, *next; |
1da177e4c Linux-2.6.12-rc2 |
606 607 |
struct shmem_inode_info *info; int found = 0; |
778dd893a tmpfs: fix race b... |
608 609 610 611 612 613 |
int error; /* * Charge page using GFP_KERNEL while we can wait, before taking * the shmem_swaplist_mutex which might hold up shmem_writepage(). * Charged back to the user (not to caller) when swap account is used. |
778dd893a tmpfs: fix race b... |
614 615 616 617 |
*/ error = mem_cgroup_cache_charge(page, current->mm, GFP_KERNEL); if (error) goto out; |
46f65ec15 tmpfs: convert sh... |
618 |
/* No radix_tree_preload: swap entry keeps a place for page in tree */ |
1da177e4c Linux-2.6.12-rc2 |
619 |
|
cb5f7b9a4 tmpfs: make shmem... |
620 |
mutex_lock(&shmem_swaplist_mutex); |
41ffe5d5c tmpfs: miscellane... |
621 622 |
list_for_each_safe(this, next, &shmem_swaplist) { info = list_entry(this, struct shmem_inode_info, swaplist); |
285b2c4fd tmpfs: demolish o... |
623 |
if (info->swapped) |
41ffe5d5c tmpfs: miscellane... |
624 |
found = shmem_unuse_inode(info, swap, page); |
6922c0c7a tmpfs: convert sh... |
625 626 |
else list_del_init(&info->swaplist); |
cb5f7b9a4 tmpfs: make shmem... |
627 |
cond_resched(); |
2e0e26c76 tmpfs: open a win... |
628 |
if (found) |
778dd893a tmpfs: fix race b... |
629 |
break; |
1da177e4c Linux-2.6.12-rc2 |
630 |
} |
cb5f7b9a4 tmpfs: make shmem... |
631 |
mutex_unlock(&shmem_swaplist_mutex); |
778dd893a tmpfs: fix race b... |
632 |
|
778dd893a tmpfs: fix race b... |
633 634 635 636 637 |
if (!found) mem_cgroup_uncharge_cache_page(page); if (found < 0) error = found; out: |
aaa468653 swap_info: note S... |
638 639 |
unlock_page(page); page_cache_release(page); |
778dd893a tmpfs: fix race b... |
640 |
return error; |
1da177e4c Linux-2.6.12-rc2 |
641 642 643 644 645 646 647 648 |
} /* * 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 |
649 |
struct address_space *mapping; |
1da177e4c Linux-2.6.12-rc2 |
650 |
struct inode *inode; |
6922c0c7a tmpfs: convert sh... |
651 652 |
swp_entry_t swap; pgoff_t index; |
1da177e4c Linux-2.6.12-rc2 |
653 654 |
BUG_ON(!PageLocked(page)); |
1da177e4c Linux-2.6.12-rc2 |
655 656 657 658 659 660 |
mapping = page->mapping; index = page->index; inode = mapping->host; info = SHMEM_I(inode); if (info->flags & VM_LOCKED) goto redirty; |
d9fe526a8 tmpfs: allow file... |
661 |
if (!total_swap_pages) |
1da177e4c Linux-2.6.12-rc2 |
662 |
goto redirty; |
d9fe526a8 tmpfs: allow file... |
663 664 665 |
/* * shmem_backing_dev_info's capabilities prevent regular writeback or * sync from ever calling shmem_writepage; but a stacking filesystem |
48f170fb7 tmpfs: simplify u... |
666 |
* might use ->writepage of its underlying filesystem, in which case |
d9fe526a8 tmpfs: allow file... |
667 |
* tmpfs should write out to swap only in response to memory pressure, |
48f170fb7 tmpfs: simplify u... |
668 |
* and not for the writeback threads or sync. |
d9fe526a8 tmpfs: allow file... |
669 |
*/ |
48f170fb7 tmpfs: simplify u... |
670 671 672 673 674 675 676 |
if (!wbc->for_reclaim) { WARN_ON_ONCE(1); /* Still happens? Tell us about it! */ goto redirty; } swap = get_swap_page(); if (!swap.val) goto redirty; |
d9fe526a8 tmpfs: allow file... |
677 |
|
b1dea800a tmpfs: fix race b... |
678 679 |
/* * Add inode to shmem_unuse()'s list of swapped-out inodes, |
6922c0c7a tmpfs: convert sh... |
680 681 |
* 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... |
682 |
* the inode from eviction. But don't unlock the mutex until |
6922c0c7a tmpfs: convert sh... |
683 684 |
* we've incremented swapped, because shmem_unuse_inode() will * prune a !swapped inode from the swaplist under this mutex. |
b1dea800a tmpfs: fix race b... |
685 |
*/ |
48f170fb7 tmpfs: simplify u... |
686 687 688 |
mutex_lock(&shmem_swaplist_mutex); if (list_empty(&info->swaplist)) list_add_tail(&info->swaplist, &shmem_swaplist); |
b1dea800a tmpfs: fix race b... |
689 |
|
48f170fb7 tmpfs: simplify u... |
690 |
if (add_to_swap_cache(page, swap, GFP_ATOMIC) == 0) { |
aaa468653 swap_info: note S... |
691 |
swap_shmem_alloc(swap); |
6922c0c7a tmpfs: convert sh... |
692 693 694 695 696 |
shmem_delete_from_page_cache(page, swp_to_radix_entry(swap)); spin_lock(&info->lock); info->swapped++; shmem_recalc_inode(inode); |
826267cf1 tmpfs: fix race b... |
697 |
spin_unlock(&info->lock); |
6922c0c7a tmpfs: convert sh... |
698 699 |
mutex_unlock(&shmem_swaplist_mutex); |
d9fe526a8 tmpfs: allow file... |
700 |
BUG_ON(page_mapped(page)); |
9fab5619b shmem: writepage ... |
701 |
swap_writepage(page, wbc); |
1da177e4c Linux-2.6.12-rc2 |
702 703 |
return 0; } |
6922c0c7a tmpfs: convert sh... |
704 |
mutex_unlock(&shmem_swaplist_mutex); |
cb4b86ba4 mm: add swap cach... |
705 |
swapcache_free(swap, NULL); |
1da177e4c Linux-2.6.12-rc2 |
706 707 |
redirty: set_page_dirty(page); |
d9fe526a8 tmpfs: allow file... |
708 709 710 711 |
if (wbc->for_reclaim) return AOP_WRITEPAGE_ACTIVATE; /* Return with page locked */ unlock_page(page); return 0; |
1da177e4c Linux-2.6.12-rc2 |
712 713 714 |
} #ifdef CONFIG_NUMA |
680d794ba mount options: fi... |
715 |
#ifdef CONFIG_TMPFS |
71fe804b6 mempolicy: use st... |
716 |
static void shmem_show_mpol(struct seq_file *seq, struct mempolicy *mpol) |
680d794ba mount options: fi... |
717 |
{ |
095f1fc4e mempolicy: rework... |
718 |
char buffer[64]; |
680d794ba mount options: fi... |
719 |
|
71fe804b6 mempolicy: use st... |
720 |
if (!mpol || mpol->mode == MPOL_DEFAULT) |
095f1fc4e mempolicy: rework... |
721 |
return; /* show nothing */ |
680d794ba mount options: fi... |
722 |
|
71fe804b6 mempolicy: use st... |
723 |
mpol_to_str(buffer, sizeof(buffer), mpol, 1); |
095f1fc4e mempolicy: rework... |
724 725 |
seq_printf(seq, ",mpol=%s", buffer); |
680d794ba mount options: fi... |
726 |
} |
71fe804b6 mempolicy: use st... |
727 728 729 730 731 732 733 734 735 736 737 738 |
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; } |
680d794ba mount options: fi... |
739 |
#endif /* CONFIG_TMPFS */ |
41ffe5d5c tmpfs: miscellane... |
740 741 |
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 |
742 |
{ |
52cd3b074 mempolicy: rework... |
743 |
struct mempolicy mpol, *spol; |
1da177e4c Linux-2.6.12-rc2 |
744 |
struct vm_area_struct pvma; |
52cd3b074 mempolicy: rework... |
745 |
spol = mpol_cond_copy(&mpol, |
41ffe5d5c tmpfs: miscellane... |
746 |
mpol_shared_policy_lookup(&info->policy, index)); |
52cd3b074 mempolicy: rework... |
747 |
|
1da177e4c Linux-2.6.12-rc2 |
748 |
/* Create a pseudo vma that just contains the policy */ |
c4cc6d07b swapin_readahead:... |
749 |
pvma.vm_start = 0; |
41ffe5d5c tmpfs: miscellane... |
750 |
pvma.vm_pgoff = index; |
c4cc6d07b swapin_readahead:... |
751 |
pvma.vm_ops = NULL; |
52cd3b074 mempolicy: rework... |
752 |
pvma.vm_policy = spol; |
41ffe5d5c tmpfs: miscellane... |
753 |
return swapin_readahead(swap, gfp, &pvma, 0); |
1da177e4c Linux-2.6.12-rc2 |
754 |
} |
02098feaa swapin needs gfp_... |
755 |
static struct page *shmem_alloc_page(gfp_t gfp, |
41ffe5d5c tmpfs: miscellane... |
756 |
struct shmem_inode_info *info, pgoff_t index) |
1da177e4c Linux-2.6.12-rc2 |
757 758 |
{ struct vm_area_struct pvma; |
1da177e4c Linux-2.6.12-rc2 |
759 |
|
c4cc6d07b swapin_readahead:... |
760 761 |
/* Create a pseudo vma that just contains the policy */ pvma.vm_start = 0; |
41ffe5d5c tmpfs: miscellane... |
762 |
pvma.vm_pgoff = index; |
c4cc6d07b swapin_readahead:... |
763 |
pvma.vm_ops = NULL; |
41ffe5d5c tmpfs: miscellane... |
764 |
pvma.vm_policy = mpol_shared_policy_lookup(&info->policy, index); |
52cd3b074 mempolicy: rework... |
765 766 767 768 769 |
/* * alloc_page_vma() will drop the shared policy reference */ return alloc_page_vma(gfp, &pvma, 0); |
1da177e4c Linux-2.6.12-rc2 |
770 |
} |
680d794ba mount options: fi... |
771 772 |
#else /* !CONFIG_NUMA */ #ifdef CONFIG_TMPFS |
41ffe5d5c tmpfs: miscellane... |
773 |
static inline void shmem_show_mpol(struct seq_file *seq, struct mempolicy *mpol) |
680d794ba mount options: fi... |
774 775 776 |
{ } #endif /* CONFIG_TMPFS */ |
41ffe5d5c tmpfs: miscellane... |
777 778 |
static inline 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 |
779 |
{ |
41ffe5d5c tmpfs: miscellane... |
780 |
return swapin_readahead(swap, gfp, NULL, 0); |
1da177e4c Linux-2.6.12-rc2 |
781 |
} |
02098feaa swapin needs gfp_... |
782 |
static inline struct page *shmem_alloc_page(gfp_t gfp, |
41ffe5d5c tmpfs: miscellane... |
783 |
struct shmem_inode_info *info, pgoff_t index) |
1da177e4c Linux-2.6.12-rc2 |
784 |
{ |
e84e2e132 tmpfs: restore mi... |
785 |
return alloc_page(gfp); |
1da177e4c Linux-2.6.12-rc2 |
786 |
} |
680d794ba mount options: fi... |
787 |
#endif /* CONFIG_NUMA */ |
1da177e4c Linux-2.6.12-rc2 |
788 |
|
71fe804b6 mempolicy: use st... |
789 790 791 792 793 794 |
#if !defined(CONFIG_NUMA) || !defined(CONFIG_TMPFS) static inline struct mempolicy *shmem_get_sbmpol(struct shmem_sb_info *sbinfo) { return NULL; } #endif |
1da177e4c Linux-2.6.12-rc2 |
795 |
/* |
68da9f055 tmpfs: pass gfp t... |
796 |
* shmem_getpage_gfp - find page in cache, or get from swap, or allocate |
1da177e4c Linux-2.6.12-rc2 |
797 798 799 800 801 |
* * 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 * entry since a page cannot live in both the swap and page cache */ |
41ffe5d5c tmpfs: miscellane... |
802 |
static int shmem_getpage_gfp(struct inode *inode, pgoff_t index, |
68da9f055 tmpfs: pass gfp t... |
803 |
struct page **pagep, enum sgp_type sgp, gfp_t gfp, int *fault_type) |
1da177e4c Linux-2.6.12-rc2 |
804 805 |
{ struct address_space *mapping = inode->i_mapping; |
54af60421 tmpfs: convert sh... |
806 |
struct shmem_inode_info *info; |
1da177e4c Linux-2.6.12-rc2 |
807 |
struct shmem_sb_info *sbinfo; |
27ab70062 tmpfs: simplify f... |
808 |
struct page *page; |
1da177e4c Linux-2.6.12-rc2 |
809 810 |
swp_entry_t swap; int error; |
54af60421 tmpfs: convert sh... |
811 |
int once = 0; |
1da177e4c Linux-2.6.12-rc2 |
812 |
|
41ffe5d5c tmpfs: miscellane... |
813 |
if (index > (MAX_LFS_FILESIZE >> PAGE_CACHE_SHIFT)) |
1da177e4c Linux-2.6.12-rc2 |
814 |
return -EFBIG; |
1da177e4c Linux-2.6.12-rc2 |
815 |
repeat: |
54af60421 tmpfs: convert sh... |
816 |
swap.val = 0; |
41ffe5d5c tmpfs: miscellane... |
817 |
page = find_lock_page(mapping, index); |
54af60421 tmpfs: convert sh... |
818 819 820 821 822 823 824 825 826 827 828 829 |
if (radix_tree_exceptional_entry(page)) { swap = radix_to_swp_entry(page); page = NULL; } if (sgp != SGP_WRITE && ((loff_t)index << PAGE_CACHE_SHIFT) >= i_size_read(inode)) { error = -EINVAL; goto failed; } if (page || (sgp == SGP_READ && !swap.val)) { |
b409f9fcf tmpfs: radix_tree... |
830 |
/* |
27ab70062 tmpfs: simplify f... |
831 832 833 |
* Once we can get the page lock, it must be uptodate: * if there were an error in reading back from swap, * the page would not be inserted into the filecache. |
b409f9fcf tmpfs: radix_tree... |
834 |
*/ |
54af60421 tmpfs: convert sh... |
835 836 837 |
BUG_ON(page && !PageUptodate(page)); *pagep = page; return 0; |
27ab70062 tmpfs: simplify f... |
838 839 840 |
} /* |
54af60421 tmpfs: convert sh... |
841 842 |
* Fast cache lookup did not find it: * bring it back from swap or allocate. |
27ab70062 tmpfs: simplify f... |
843 |
*/ |
54af60421 tmpfs: convert sh... |
844 845 |
info = SHMEM_I(inode); sbinfo = SHMEM_SB(inode->i_sb); |
1da177e4c Linux-2.6.12-rc2 |
846 |
|
1da177e4c Linux-2.6.12-rc2 |
847 848 |
if (swap.val) { /* Look it up and read it in.. */ |
27ab70062 tmpfs: simplify f... |
849 850 |
page = lookup_swap_cache(swap); if (!page) { |
1da177e4c Linux-2.6.12-rc2 |
851 |
/* here we actually do the io */ |
68da9f055 tmpfs: pass gfp t... |
852 853 |
if (fault_type) *fault_type |= VM_FAULT_MAJOR; |
41ffe5d5c tmpfs: miscellane... |
854 |
page = shmem_swapin(swap, gfp, info, index); |
27ab70062 tmpfs: simplify f... |
855 |
if (!page) { |
54af60421 tmpfs: convert sh... |
856 857 |
error = -ENOMEM; goto failed; |
1da177e4c Linux-2.6.12-rc2 |
858 |
} |
1da177e4c Linux-2.6.12-rc2 |
859 860 861 |
} /* We have to do this with page locked to prevent races */ |
54af60421 tmpfs: convert sh... |
862 |
lock_page(page); |
27ab70062 tmpfs: simplify f... |
863 |
if (!PageUptodate(page)) { |
1da177e4c Linux-2.6.12-rc2 |
864 |
error = -EIO; |
54af60421 tmpfs: convert sh... |
865 |
goto failed; |
1da177e4c Linux-2.6.12-rc2 |
866 |
} |
54af60421 tmpfs: convert sh... |
867 868 869 870 871 872 873 874 875 |
wait_on_page_writeback(page); /* Someone may have already done it for us */ if (page->mapping) { if (page->mapping == mapping && page->index == index) goto done; error = -EEXIST; goto failed; |
1da177e4c Linux-2.6.12-rc2 |
876 |
} |
27ab70062 tmpfs: simplify f... |
877 |
|
aa3b18955 tmpfs: convert me... |
878 879 880 881 882 |
error = mem_cgroup_cache_charge(page, current->mm, gfp & GFP_RECLAIM_MASK); if (!error) error = shmem_add_to_page_cache(page, mapping, index, gfp, swp_to_radix_entry(swap)); |
54af60421 tmpfs: convert sh... |
883 884 885 886 |
if (error) goto failed; spin_lock(&info->lock); |
285b2c4fd tmpfs: demolish o... |
887 |
info->swapped--; |
54af60421 tmpfs: convert sh... |
888 |
shmem_recalc_inode(inode); |
27ab70062 tmpfs: simplify f... |
889 |
spin_unlock(&info->lock); |
54af60421 tmpfs: convert sh... |
890 891 |
delete_from_swap_cache(page); |
27ab70062 tmpfs: simplify f... |
892 893 |
set_page_dirty(page); swap_free(swap); |
54af60421 tmpfs: convert sh... |
894 895 896 897 |
} else { if (shmem_acct_block(info->flags)) { error = -ENOSPC; goto failed; |
1da177e4c Linux-2.6.12-rc2 |
898 |
} |
0edd73b33 [PATCH] shmem: re... |
899 |
if (sbinfo->max_blocks) { |
fc5da22ae tmpfs: fix off-by... |
900 |
if (percpu_counter_compare(&sbinfo->used_blocks, |
54af60421 tmpfs: convert sh... |
901 902 903 904 |
sbinfo->max_blocks) >= 0) { error = -ENOSPC; goto unacct; } |
7e496299d tmpfs: make tmpfs... |
905 |
percpu_counter_inc(&sbinfo->used_blocks); |
54af60421 tmpfs: convert sh... |
906 |
} |
1da177e4c Linux-2.6.12-rc2 |
907 |
|
54af60421 tmpfs: convert sh... |
908 909 910 911 |
page = shmem_alloc_page(gfp, info, index); if (!page) { error = -ENOMEM; goto decused; |
1da177e4c Linux-2.6.12-rc2 |
912 |
} |
54af60421 tmpfs: convert sh... |
913 914 |
SetPageSwapBacked(page); __set_page_locked(page); |
aa3b18955 tmpfs: convert me... |
915 916 917 918 919 |
error = mem_cgroup_cache_charge(page, current->mm, gfp & GFP_RECLAIM_MASK); if (!error) error = shmem_add_to_page_cache(page, mapping, index, gfp, NULL); |
54af60421 tmpfs: convert sh... |
920 921 922 923 924 |
if (error) goto decused; lru_cache_add_anon(page); spin_lock(&info->lock); |
1da177e4c Linux-2.6.12-rc2 |
925 |
info->alloced++; |
54af60421 tmpfs: convert sh... |
926 927 |
inode->i_blocks += BLOCKS_PER_PAGE; shmem_recalc_inode(inode); |
1da177e4c Linux-2.6.12-rc2 |
928 |
spin_unlock(&info->lock); |
54af60421 tmpfs: convert sh... |
929 |
|
27ab70062 tmpfs: simplify f... |
930 931 932 |
clear_highpage(page); flush_dcache_page(page); SetPageUptodate(page); |
a0ee5ec52 tmpfs: allocate o... |
933 |
if (sgp == SGP_DIRTY) |
27ab70062 tmpfs: simplify f... |
934 |
set_page_dirty(page); |
1da177e4c Linux-2.6.12-rc2 |
935 936 |
} done: |
54af60421 tmpfs: convert sh... |
937 938 939 940 941 |
/* Perhaps the file has been truncated since we checked */ if (sgp != SGP_WRITE && ((loff_t)index << PAGE_CACHE_SHIFT) >= i_size_read(inode)) { error = -EINVAL; goto trunc; |
e83c32e8f tmpfs: simplify p... |
942 |
} |
54af60421 tmpfs: convert sh... |
943 944 |
*pagep = page; return 0; |
1da177e4c Linux-2.6.12-rc2 |
945 |
|
59a16ead5 tmpfs: fix spurio... |
946 |
/* |
54af60421 tmpfs: convert sh... |
947 |
* Error recovery. |
59a16ead5 tmpfs: fix spurio... |
948 |
*/ |
54af60421 tmpfs: convert sh... |
949 950 951 952 953 954 |
trunc: ClearPageDirty(page); delete_from_page_cache(page); spin_lock(&info->lock); info->alloced--; inode->i_blocks -= BLOCKS_PER_PAGE; |
59a16ead5 tmpfs: fix spurio... |
955 |
spin_unlock(&info->lock); |
54af60421 tmpfs: convert sh... |
956 957 958 959 960 961 962 963 964 965 966 967 968 969 |
decused: if (sbinfo->max_blocks) percpu_counter_add(&sbinfo->used_blocks, -1); unacct: shmem_unacct_blocks(info->flags, 1); failed: if (swap.val && error != -EINVAL) { struct page *test = find_get_page(mapping, index); if (test && !radix_tree_exceptional_entry(test)) page_cache_release(test); /* Have another try if the entry has changed */ if (test != swp_to_radix_entry(swap)) error = -EEXIST; } |
27ab70062 tmpfs: simplify f... |
970 |
if (page) { |
54af60421 tmpfs: convert sh... |
971 |
unlock_page(page); |
27ab70062 tmpfs: simplify f... |
972 |
page_cache_release(page); |
54af60421 tmpfs: convert sh... |
973 974 975 976 977 978 |
} if (error == -ENOSPC && !once++) { info = SHMEM_I(inode); spin_lock(&info->lock); shmem_recalc_inode(inode); spin_unlock(&info->lock); |
27ab70062 tmpfs: simplify f... |
979 |
goto repeat; |
ff36b8016 shmem: reduce pag... |
980 |
} |
54af60421 tmpfs: convert sh... |
981 982 983 |
if (error == -EEXIST) goto repeat; return error; |
1da177e4c Linux-2.6.12-rc2 |
984 |
} |
d0217ac04 mm: fault feedbac... |
985 |
static int shmem_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
1da177e4c Linux-2.6.12-rc2 |
986 |
{ |
d3ac7f892 [PATCH] mm: chang... |
987 |
struct inode *inode = vma->vm_file->f_path.dentry->d_inode; |
1da177e4c Linux-2.6.12-rc2 |
988 |
int error; |
68da9f055 tmpfs: pass gfp t... |
989 |
int ret = VM_FAULT_LOCKED; |
1da177e4c Linux-2.6.12-rc2 |
990 |
|
27d54b398 shmem: SGP_QUICK ... |
991 |
error = shmem_getpage(inode, vmf->pgoff, &vmf->page, SGP_CACHE, &ret); |
d0217ac04 mm: fault feedbac... |
992 993 |
if (error) return ((error == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS); |
68da9f055 tmpfs: pass gfp t... |
994 |
|
456f998ec memcg: add the pa... |
995 996 997 998 |
if (ret & VM_FAULT_MAJOR) { count_vm_event(PGMAJFAULT); mem_cgroup_count_vm_event(vma->vm_mm, PGMAJFAULT); } |
68da9f055 tmpfs: pass gfp t... |
999 |
return ret; |
1da177e4c Linux-2.6.12-rc2 |
1000 |
} |
1da177e4c Linux-2.6.12-rc2 |
1001 |
#ifdef CONFIG_NUMA |
41ffe5d5c tmpfs: miscellane... |
1002 |
static int shmem_set_policy(struct vm_area_struct *vma, struct mempolicy *mpol) |
1da177e4c Linux-2.6.12-rc2 |
1003 |
{ |
41ffe5d5c tmpfs: miscellane... |
1004 1005 |
struct inode *inode = vma->vm_file->f_path.dentry->d_inode; return mpol_set_shared_policy(&SHMEM_I(inode)->policy, vma, mpol); |
1da177e4c Linux-2.6.12-rc2 |
1006 |
} |
d8dc74f21 mm/shmem.c: make ... |
1007 1008 |
static struct mempolicy *shmem_get_policy(struct vm_area_struct *vma, unsigned long addr) |
1da177e4c Linux-2.6.12-rc2 |
1009 |
{ |
41ffe5d5c tmpfs: miscellane... |
1010 1011 |
struct inode *inode = vma->vm_file->f_path.dentry->d_inode; pgoff_t index; |
1da177e4c Linux-2.6.12-rc2 |
1012 |
|
41ffe5d5c tmpfs: miscellane... |
1013 1014 |
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 |
1015 1016 1017 1018 1019 |
} #endif int shmem_lock(struct file *file, int lock, struct user_struct *user) { |
d3ac7f892 [PATCH] mm: chang... |
1020 |
struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4c Linux-2.6.12-rc2 |
1021 1022 1023 1024 1025 1026 1027 1028 |
struct shmem_inode_info *info = SHMEM_I(inode); int retval = -ENOMEM; spin_lock(&info->lock); 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 ... |
1029 |
mapping_set_unevictable(file->f_mapping); |
1da177e4c Linux-2.6.12-rc2 |
1030 1031 1032 1033 |
} if (!lock && (info->flags & VM_LOCKED) && user) { user_shm_unlock(inode->i_size, user); info->flags &= ~VM_LOCKED; |
89e004ea5 SHM_LOCKED pages ... |
1034 |
mapping_clear_unevictable(file->f_mapping); |
21ee9f398 vmscan: add barri... |
1035 1036 1037 1038 1039 1040 |
/* * Ensure that a racing putback_lru_page() can see * the pages of this mapping are evictable when we * skip them due to !PageLRU during the scan. */ smp_mb__after_clear_bit(); |
89e004ea5 SHM_LOCKED pages ... |
1041 |
scan_mapping_unevictable_pages(file->f_mapping); |
1da177e4c Linux-2.6.12-rc2 |
1042 1043 |
} retval = 0; |
89e004ea5 SHM_LOCKED pages ... |
1044 |
|
1da177e4c Linux-2.6.12-rc2 |
1045 1046 1047 1048 |
out_nomem: spin_unlock(&info->lock); return retval; } |
9b83a6a85 [PATCH] mm/{,tiny... |
1049 |
static int shmem_mmap(struct file *file, struct vm_area_struct *vma) |
1da177e4c Linux-2.6.12-rc2 |
1050 1051 1052 |
{ file_accessed(file); vma->vm_ops = &shmem_vm_ops; |
d0217ac04 mm: fault feedbac... |
1053 |
vma->vm_flags |= VM_CAN_NONLINEAR; |
1da177e4c Linux-2.6.12-rc2 |
1054 1055 |
return 0; } |
454abafe9 ramfs: replace in... |
1056 1057 |
static struct inode *shmem_get_inode(struct super_block *sb, const struct inode *dir, int mode, dev_t dev, unsigned long flags) |
1da177e4c Linux-2.6.12-rc2 |
1058 1059 1060 1061 |
{ struct inode *inode; struct shmem_inode_info *info; struct shmem_sb_info *sbinfo = SHMEM_SB(sb); |
5b04c6890 shmem: factor out... |
1062 1063 |
if (shmem_reserve_inode(sb)) return NULL; |
1da177e4c Linux-2.6.12-rc2 |
1064 1065 1066 |
inode = new_inode(sb); if (inode) { |
85fe4025c fs: do not assign... |
1067 |
inode->i_ino = get_next_ino(); |
454abafe9 ramfs: replace in... |
1068 |
inode_init_owner(inode, dir, mode); |
1da177e4c Linux-2.6.12-rc2 |
1069 |
inode->i_blocks = 0; |
1da177e4c Linux-2.6.12-rc2 |
1070 1071 |
inode->i_mapping->backing_dev_info = &shmem_backing_dev_info; inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
91828a405 [PATCH] knfsd: ad... |
1072 |
inode->i_generation = get_seconds(); |
1da177e4c Linux-2.6.12-rc2 |
1073 1074 1075 |
info = SHMEM_I(inode); memset(info, 0, (char *)inode - (char *)info); spin_lock_init(&info->lock); |
0b0a0806b shmem: fix shared... |
1076 |
info->flags = flags & VM_NORESERVE; |
1da177e4c Linux-2.6.12-rc2 |
1077 |
INIT_LIST_HEAD(&info->swaplist); |
b09e0fa4b tmpfs: implement ... |
1078 |
INIT_LIST_HEAD(&info->xattr_list); |
72c04902d Get "no acls for ... |
1079 |
cache_no_acl(inode); |
1da177e4c Linux-2.6.12-rc2 |
1080 1081 1082 |
switch (mode & S_IFMT) { default: |
39f0247d3 [PATCH] Access Co... |
1083 |
inode->i_op = &shmem_special_inode_operations; |
1da177e4c Linux-2.6.12-rc2 |
1084 1085 1086 |
init_special_inode(inode, mode, dev); break; case S_IFREG: |
14fcc23fd tmpfs: fix kernel... |
1087 |
inode->i_mapping->a_ops = &shmem_aops; |
1da177e4c Linux-2.6.12-rc2 |
1088 1089 |
inode->i_op = &shmem_inode_operations; inode->i_fop = &shmem_file_operations; |
71fe804b6 mempolicy: use st... |
1090 1091 |
mpol_shared_policy_init(&info->policy, shmem_get_sbmpol(sbinfo)); |
1da177e4c Linux-2.6.12-rc2 |
1092 1093 |
break; case S_IFDIR: |
d8c76e6f4 [PATCH] r/o bind ... |
1094 |
inc_nlink(inode); |
1da177e4c Linux-2.6.12-rc2 |
1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 |
/* 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... |
1105 |
mpol_shared_policy_init(&info->policy, NULL); |
1da177e4c Linux-2.6.12-rc2 |
1106 1107 |
break; } |
5b04c6890 shmem: factor out... |
1108 1109 |
} else shmem_free_inode(sb); |
1da177e4c Linux-2.6.12-rc2 |
1110 1111 1112 1113 |
return inode; } #ifdef CONFIG_TMPFS |
92e1d5be9 [PATCH] mark stru... |
1114 |
static const struct inode_operations shmem_symlink_inode_operations; |
69f07ec93 tmpfs: use kmemdu... |
1115 |
static const struct inode_operations shmem_short_symlink_operations; |
1da177e4c Linux-2.6.12-rc2 |
1116 |
|
1da177e4c Linux-2.6.12-rc2 |
1117 |
static int |
800d15a53 implement simple ... |
1118 1119 1120 |
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 |
1121 |
{ |
800d15a53 implement simple ... |
1122 1123 |
struct inode *inode = mapping->host; pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
800d15a53 implement simple ... |
1124 1125 1126 1127 1128 1129 1130 1131 1132 |
return shmem_getpage(inode, index, pagep, SGP_WRITE, NULL); } 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... |
1133 1134 |
if (pos + copied > inode->i_size) i_size_write(inode, pos + copied); |
800d15a53 implement simple ... |
1135 |
set_page_dirty(page); |
6746aff74 HWPOISON: shmem: ... |
1136 |
unlock_page(page); |
800d15a53 implement simple ... |
1137 |
page_cache_release(page); |
800d15a53 implement simple ... |
1138 |
return copied; |
1da177e4c Linux-2.6.12-rc2 |
1139 |
} |
1da177e4c Linux-2.6.12-rc2 |
1140 1141 |
static void do_shmem_file_read(struct file *filp, loff_t *ppos, read_descriptor_t *desc, read_actor_t actor) { |
d3ac7f892 [PATCH] mm: chang... |
1142 |
struct inode *inode = filp->f_path.dentry->d_inode; |
1da177e4c Linux-2.6.12-rc2 |
1143 |
struct address_space *mapping = inode->i_mapping; |
41ffe5d5c tmpfs: miscellane... |
1144 1145 |
pgoff_t index; unsigned long offset; |
a0ee5ec52 tmpfs: allocate o... |
1146 1147 1148 1149 1150 1151 1152 1153 1154 |
enum sgp_type sgp = SGP_READ; /* * 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. */ if (segment_eq(get_fs(), KERNEL_DS)) sgp = SGP_DIRTY; |
1da177e4c Linux-2.6.12-rc2 |
1155 1156 1157 1158 1159 1160 |
index = *ppos >> PAGE_CACHE_SHIFT; offset = *ppos & ~PAGE_CACHE_MASK; for (;;) { struct page *page = NULL; |
41ffe5d5c tmpfs: miscellane... |
1161 1162 |
pgoff_t end_index; unsigned long nr, ret; |
1da177e4c Linux-2.6.12-rc2 |
1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 |
loff_t i_size = i_size_read(inode); end_index = i_size >> PAGE_CACHE_SHIFT; if (index > end_index) break; if (index == end_index) { nr = i_size & ~PAGE_CACHE_MASK; if (nr <= offset) break; } |
a0ee5ec52 tmpfs: allocate o... |
1173 |
desc->error = shmem_getpage(inode, index, &page, sgp, NULL); |
1da177e4c Linux-2.6.12-rc2 |
1174 1175 1176 1177 1178 |
if (desc->error) { if (desc->error == -EINVAL) desc->error = 0; break; } |
d3602444e shmem_getpage ret... |
1179 1180 |
if (page) unlock_page(page); |
1da177e4c Linux-2.6.12-rc2 |
1181 1182 1183 |
/* * We must evaluate after, since reads (unlike writes) |
1b1dcc1b5 [PATCH] mutex sub... |
1184 |
* are called without i_mutex protection against truncate |
1da177e4c Linux-2.6.12-rc2 |
1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 |
*/ nr = PAGE_CACHE_SIZE; i_size = i_size_read(inode); end_index = i_size >> PAGE_CACHE_SHIFT; if (index == end_index) { nr = i_size & ~PAGE_CACHE_MASK; if (nr <= offset) { if (page) page_cache_release(page); 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... |
1212 |
} else { |
1da177e4c Linux-2.6.12-rc2 |
1213 |
page = ZERO_PAGE(0); |
b5810039a [PATCH] core remo... |
1214 1215 |
page_cache_get(page); } |
1da177e4c Linux-2.6.12-rc2 |
1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 |
/* * Ok, we have the page, and it's up-to-date, so * now we can copy it to user space... * * The actor routine returns how many bytes were actually used.. * NOTE! This may not be the same as how much of a user buffer * we filled up (we may be padding etc), so we can only update * "pos" here (the actor routine has to update the user buffer * pointers and the remaining count). */ ret = actor(desc, page, offset, nr); offset += ret; index += offset >> PAGE_CACHE_SHIFT; offset &= ~PAGE_CACHE_MASK; page_cache_release(page); if (ret != nr || !desc->count) break; cond_resched(); } *ppos = ((loff_t) index << PAGE_CACHE_SHIFT) + offset; file_accessed(filp); } |
bcd78e496 tmpfs: support aio |
1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 |
static ssize_t shmem_file_aio_read(struct kiocb *iocb, const struct iovec *iov, unsigned long nr_segs, loff_t pos) { struct file *filp = iocb->ki_filp; ssize_t retval; unsigned long seg; size_t count; loff_t *ppos = &iocb->ki_pos; retval = generic_segment_checks(iov, &nr_segs, &count, VERIFY_WRITE); if (retval) return retval; for (seg = 0; seg < nr_segs; seg++) { read_descriptor_t desc; desc.written = 0; desc.arg.buf = iov[seg].iov_base; desc.count = iov[seg].iov_len; if (desc.count == 0) continue; desc.error = 0; do_shmem_file_read(filp, ppos, &desc, file_read_actor); retval += desc.written; if (desc.error) { retval = retval ?: desc.error; break; } if (desc.count > 0) break; } return retval; |
1da177e4c Linux-2.6.12-rc2 |
1274 |
} |
708e3508c tmpfs: clone shme... |
1275 1276 1277 1278 1279 |
static ssize_t shmem_file_splice_read(struct file *in, loff_t *ppos, struct pipe_inode_info *pipe, size_t len, unsigned int flags) { struct address_space *mapping = in->f_mapping; |
71f0e07a6 tmpfs: refine shm... |
1280 |
struct inode *inode = mapping->host; |
708e3508c tmpfs: clone shme... |
1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 |
unsigned int loff, nr_pages, req_pages; struct page *pages[PIPE_DEF_BUFFERS]; struct partial_page partial[PIPE_DEF_BUFFERS]; struct page *page; pgoff_t index, end_index; loff_t isize, left; int error, page_nr; struct splice_pipe_desc spd = { .pages = pages, .partial = partial, .flags = flags, .ops = &page_cache_pipe_buf_ops, .spd_release = spd_release_page, }; |
71f0e07a6 tmpfs: refine shm... |
1295 |
isize = i_size_read(inode); |
708e3508c tmpfs: clone shme... |
1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 |
if (unlikely(*ppos >= isize)) return 0; left = isize - *ppos; if (unlikely(left < len)) len = left; if (splice_grow_spd(pipe, &spd)) return -ENOMEM; index = *ppos >> PAGE_CACHE_SHIFT; loff = *ppos & ~PAGE_CACHE_MASK; req_pages = (len + loff + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT; nr_pages = min(req_pages, pipe->buffers); |
708e3508c tmpfs: clone shme... |
1310 1311 1312 |
spd.nr_pages = find_get_pages_contig(mapping, index, nr_pages, spd.pages); index += spd.nr_pages; |
708e3508c tmpfs: clone shme... |
1313 |
error = 0; |
708e3508c tmpfs: clone shme... |
1314 |
|
71f0e07a6 tmpfs: refine shm... |
1315 |
while (spd.nr_pages < nr_pages) { |
71f0e07a6 tmpfs: refine shm... |
1316 1317 1318 1319 |
error = shmem_getpage(inode, index, &page, SGP_CACHE, NULL); if (error) break; unlock_page(page); |
708e3508c tmpfs: clone shme... |
1320 1321 1322 |
spd.pages[spd.nr_pages++] = page; index++; } |
708e3508c tmpfs: clone shme... |
1323 1324 1325 |
index = *ppos >> PAGE_CACHE_SHIFT; nr_pages = spd.nr_pages; spd.nr_pages = 0; |
71f0e07a6 tmpfs: refine shm... |
1326 |
|
708e3508c tmpfs: clone shme... |
1327 1328 1329 1330 1331 |
for (page_nr = 0; page_nr < nr_pages; page_nr++) { unsigned int this_len; if (!len) break; |
708e3508c tmpfs: clone shme... |
1332 1333 |
this_len = min_t(unsigned long, len, PAGE_CACHE_SIZE - loff); page = spd.pages[page_nr]; |
71f0e07a6 tmpfs: refine shm... |
1334 |
if (!PageUptodate(page) || page->mapping != mapping) { |
71f0e07a6 tmpfs: refine shm... |
1335 1336 1337 |
error = shmem_getpage(inode, index, &page, SGP_CACHE, NULL); if (error) |
708e3508c tmpfs: clone shme... |
1338 |
break; |
71f0e07a6 tmpfs: refine shm... |
1339 1340 1341 |
unlock_page(page); page_cache_release(spd.pages[page_nr]); spd.pages[page_nr] = page; |
708e3508c tmpfs: clone shme... |
1342 |
} |
71f0e07a6 tmpfs: refine shm... |
1343 1344 |
isize = i_size_read(inode); |
708e3508c tmpfs: clone shme... |
1345 1346 1347 |
end_index = (isize - 1) >> PAGE_CACHE_SHIFT; if (unlikely(!isize || index > end_index)) break; |
708e3508c tmpfs: clone shme... |
1348 1349 |
if (end_index == index) { unsigned int plen; |
708e3508c tmpfs: clone shme... |
1350 1351 1352 |
plen = ((isize - 1) & ~PAGE_CACHE_MASK) + 1; if (plen <= loff) break; |
708e3508c tmpfs: clone shme... |
1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 |
this_len = min(this_len, plen - loff); len = this_len; } spd.partial[page_nr].offset = loff; spd.partial[page_nr].len = this_len; len -= this_len; loff = 0; spd.nr_pages++; index++; } |
708e3508c tmpfs: clone shme... |
1364 1365 |
while (page_nr < nr_pages) page_cache_release(spd.pages[page_nr++]); |
708e3508c tmpfs: clone shme... |
1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 |
if (spd.nr_pages) error = splice_to_pipe(pipe, &spd); splice_shrink_spd(pipe, &spd); if (error > 0) { *ppos += error; file_accessed(in); } return error; } |
726c33422 [PATCH] VFS: Perm... |
1378 |
static int shmem_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4c Linux-2.6.12-rc2 |
1379 |
{ |
726c33422 [PATCH] VFS: Perm... |
1380 |
struct shmem_sb_info *sbinfo = SHMEM_SB(dentry->d_sb); |
1da177e4c Linux-2.6.12-rc2 |
1381 1382 1383 1384 |
buf->f_type = TMPFS_MAGIC; buf->f_bsize = PAGE_CACHE_SIZE; buf->f_namelen = NAME_MAX; |
0edd73b33 [PATCH] shmem: re... |
1385 |
if (sbinfo->max_blocks) { |
1da177e4c Linux-2.6.12-rc2 |
1386 |
buf->f_blocks = sbinfo->max_blocks; |
41ffe5d5c tmpfs: miscellane... |
1387 1388 1389 |
buf->f_bavail = buf->f_bfree = sbinfo->max_blocks - percpu_counter_sum(&sbinfo->used_blocks); |
0edd73b33 [PATCH] shmem: re... |
1390 1391 |
} if (sbinfo->max_inodes) { |
1da177e4c Linux-2.6.12-rc2 |
1392 1393 |
buf->f_files = sbinfo->max_inodes; buf->f_ffree = sbinfo->free_inodes; |
1da177e4c Linux-2.6.12-rc2 |
1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 |
} /* else leave those fields 0 like simple_statfs */ return 0; } /* * File creation. Allocate an inode, and we're done.. */ static int shmem_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) { |
0b0a0806b shmem: fix shared... |
1405 |
struct inode *inode; |
1da177e4c Linux-2.6.12-rc2 |
1406 |
int error = -ENOSPC; |
454abafe9 ramfs: replace in... |
1407 |
inode = shmem_get_inode(dir->i_sb, dir, mode, dev, VM_NORESERVE); |
1da177e4c Linux-2.6.12-rc2 |
1408 |
if (inode) { |
2a7dba391 fs/vfs/security: ... |
1409 |
error = security_inode_init_security(inode, dir, |
9d8f13ba3 security: new sec... |
1410 |
&dentry->d_name, |
2a7dba391 fs/vfs/security: ... |
1411 |
NULL, NULL); |
570bc1c2e [PATCH] tmpfs: En... |
1412 1413 1414 1415 1416 |
if (error) { if (error != -EOPNOTSUPP) { iput(inode); return error; } |
39f0247d3 [PATCH] Access Co... |
1417 |
} |
1c7c474c3 make generic_acl ... |
1418 1419 |
#ifdef CONFIG_TMPFS_POSIX_ACL error = generic_acl_init(inode, dir); |
39f0247d3 [PATCH] Access Co... |
1420 1421 1422 |
if (error) { iput(inode); return error; |
570bc1c2e [PATCH] tmpfs: En... |
1423 |
} |
718deb6b6 Fix breakage in s... |
1424 1425 |
#else error = 0; |
1c7c474c3 make generic_acl ... |
1426 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
1427 1428 1429 1430 |
dir->i_size += BOGO_DIRENT_SIZE; dir->i_ctime = dir->i_mtime = CURRENT_TIME; d_instantiate(dentry, inode); dget(dentry); /* Extra count - pin the dentry in core */ |
1da177e4c Linux-2.6.12-rc2 |
1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 |
} return error; } static int shmem_mkdir(struct inode *dir, struct dentry *dentry, int mode) { int error; if ((error = shmem_mknod(dir, dentry, mode | S_IFDIR, 0))) return error; |
d8c76e6f4 [PATCH] r/o bind ... |
1441 |
inc_nlink(dir); |
1da177e4c Linux-2.6.12-rc2 |
1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 |
return 0; } static int shmem_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *nd) { 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) { struct inode *inode = old_dentry->d_inode; |
5b04c6890 shmem: factor out... |
1457 |
int ret; |
1da177e4c Linux-2.6.12-rc2 |
1458 1459 1460 1461 1462 1463 |
/* * 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. */ |
5b04c6890 shmem: factor out... |
1464 1465 1466 |
ret = shmem_reserve_inode(inode->i_sb); if (ret) goto out; |
1da177e4c Linux-2.6.12-rc2 |
1467 1468 1469 |
dir->i_size += BOGO_DIRENT_SIZE; inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME; |
d8c76e6f4 [PATCH] r/o bind ... |
1470 |
inc_nlink(inode); |
7de9c6ee3 new helper: ihold() |
1471 |
ihold(inode); /* New dentry reference */ |
1da177e4c Linux-2.6.12-rc2 |
1472 1473 |
dget(dentry); /* Extra pinning count for the created dentry */ d_instantiate(dentry, inode); |
5b04c6890 shmem: factor out... |
1474 1475 |
out: return ret; |
1da177e4c Linux-2.6.12-rc2 |
1476 1477 1478 1479 1480 |
} static int shmem_unlink(struct inode *dir, struct dentry *dentry) { struct inode *inode = dentry->d_inode; |
5b04c6890 shmem: factor out... |
1481 1482 |
if (inode->i_nlink > 1 && !S_ISDIR(inode->i_mode)) shmem_free_inode(inode->i_sb); |
1da177e4c Linux-2.6.12-rc2 |
1483 1484 1485 |
dir->i_size -= BOGO_DIRENT_SIZE; inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME; |
9a53c3a78 [PATCH] r/o bind ... |
1486 |
drop_nlink(inode); |
1da177e4c Linux-2.6.12-rc2 |
1487 1488 1489 1490 1491 1492 1493 1494 |
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; |
9a53c3a78 [PATCH] r/o bind ... |
1495 1496 |
drop_nlink(dentry->d_inode); drop_nlink(dir); |
1da177e4c Linux-2.6.12-rc2 |
1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 |
return shmem_unlink(dir, dentry); } /* * 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. */ static int shmem_rename(struct inode *old_dir, struct dentry *old_dentry, struct inode *new_dir, struct dentry *new_dentry) { struct inode *inode = old_dentry->d_inode; int they_are_dirs = S_ISDIR(inode->i_mode); if (!simple_empty(new_dentry)) return -ENOTEMPTY; if (new_dentry->d_inode) { (void) shmem_unlink(new_dir, new_dentry); if (they_are_dirs) |
9a53c3a78 [PATCH] r/o bind ... |
1517 |
drop_nlink(old_dir); |
1da177e4c Linux-2.6.12-rc2 |
1518 |
} else if (they_are_dirs) { |
9a53c3a78 [PATCH] r/o bind ... |
1519 |
drop_nlink(old_dir); |
d8c76e6f4 [PATCH] r/o bind ... |
1520 |
inc_nlink(new_dir); |
1da177e4c Linux-2.6.12-rc2 |
1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 |
} 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 = inode->i_ctime = CURRENT_TIME; 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... |
1536 |
struct page *page; |
1da177e4c Linux-2.6.12-rc2 |
1537 1538 1539 1540 1541 1542 |
char *kaddr; struct shmem_inode_info *info; len = strlen(symname) + 1; if (len > PAGE_CACHE_SIZE) return -ENAMETOOLONG; |
454abafe9 ramfs: replace in... |
1543 |
inode = shmem_get_inode(dir->i_sb, dir, S_IFLNK|S_IRWXUGO, 0, VM_NORESERVE); |
1da177e4c Linux-2.6.12-rc2 |
1544 1545 |
if (!inode) return -ENOSPC; |
9d8f13ba3 security: new sec... |
1546 |
error = security_inode_init_security(inode, dir, &dentry->d_name, |
2a7dba391 fs/vfs/security: ... |
1547 |
NULL, NULL); |
570bc1c2e [PATCH] tmpfs: En... |
1548 1549 1550 1551 1552 1553 1554 |
if (error) { if (error != -EOPNOTSUPP) { iput(inode); return error; } error = 0; } |
1da177e4c Linux-2.6.12-rc2 |
1555 1556 |
info = SHMEM_I(inode); inode->i_size = len-1; |
69f07ec93 tmpfs: use kmemdu... |
1557 1558 1559 1560 1561 1562 1563 |
if (len <= SHORT_SYMLINK_LEN) { info->symlink = kmemdup(symname, len, GFP_KERNEL); if (!info->symlink) { iput(inode); return -ENOMEM; } inode->i_op = &shmem_short_symlink_operations; |
1da177e4c Linux-2.6.12-rc2 |
1564 1565 1566 1567 1568 1569 |
} else { error = shmem_getpage(inode, 0, &page, SGP_WRITE, NULL); if (error) { iput(inode); return error; } |
14fcc23fd tmpfs: fix kernel... |
1570 |
inode->i_mapping->a_ops = &shmem_aops; |
1da177e4c Linux-2.6.12-rc2 |
1571 1572 1573 1574 1575 |
inode->i_op = &shmem_symlink_inode_operations; kaddr = kmap_atomic(page, KM_USER0); memcpy(kaddr, symname, len); kunmap_atomic(kaddr, KM_USER0); set_page_dirty(page); |
6746aff74 HWPOISON: shmem: ... |
1576 |
unlock_page(page); |
1da177e4c Linux-2.6.12-rc2 |
1577 1578 |
page_cache_release(page); } |
1da177e4c Linux-2.6.12-rc2 |
1579 1580 1581 1582 1583 1584 |
dir->i_size += BOGO_DIRENT_SIZE; dir->i_ctime = dir->i_mtime = CURRENT_TIME; d_instantiate(dentry, inode); dget(dentry); return 0; } |
69f07ec93 tmpfs: use kmemdu... |
1585 |
static void *shmem_follow_short_symlink(struct dentry *dentry, struct nameidata *nd) |
1da177e4c Linux-2.6.12-rc2 |
1586 |
{ |
69f07ec93 tmpfs: use kmemdu... |
1587 |
nd_set_link(nd, SHMEM_I(dentry->d_inode)->symlink); |
cc314eef0 Fix nasty ncpfs s... |
1588 |
return NULL; |
1da177e4c Linux-2.6.12-rc2 |
1589 |
} |
cc314eef0 Fix nasty ncpfs s... |
1590 |
static void *shmem_follow_link(struct dentry *dentry, struct nameidata *nd) |
1da177e4c Linux-2.6.12-rc2 |
1591 1592 |
{ struct page *page = NULL; |
41ffe5d5c tmpfs: miscellane... |
1593 1594 |
int error = shmem_getpage(dentry->d_inode, 0, &page, SGP_READ, NULL); nd_set_link(nd, error ? ERR_PTR(error) : kmap(page)); |
d3602444e shmem_getpage ret... |
1595 1596 |
if (page) unlock_page(page); |
cc314eef0 Fix nasty ncpfs s... |
1597 |
return page; |
1da177e4c Linux-2.6.12-rc2 |
1598 |
} |
cc314eef0 Fix nasty ncpfs s... |
1599 |
static void shmem_put_link(struct dentry *dentry, struct nameidata *nd, void *cookie) |
1da177e4c Linux-2.6.12-rc2 |
1600 1601 |
{ if (!IS_ERR(nd_get_link(nd))) { |
cc314eef0 Fix nasty ncpfs s... |
1602 |
struct page *page = cookie; |
1da177e4c Linux-2.6.12-rc2 |
1603 1604 1605 |
kunmap(page); mark_page_accessed(page); page_cache_release(page); |
1da177e4c Linux-2.6.12-rc2 |
1606 1607 |
} } |
b09e0fa4b tmpfs: implement ... |
1608 |
#ifdef CONFIG_TMPFS_XATTR |
467118102 mm/shmem and tiny... |
1609 |
/* |
b09e0fa4b tmpfs: implement ... |
1610 1611 |
* 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... |
1612 1613 1614 |
* like ACLs, we also need to implement the security.* handlers at * filesystem level, though. */ |
b09e0fa4b tmpfs: implement ... |
1615 1616 |
static int shmem_xattr_get(struct dentry *dentry, const char *name, void *buffer, size_t size) |
39f0247d3 [PATCH] Access Co... |
1617 |
{ |
b09e0fa4b tmpfs: implement ... |
1618 1619 1620 |
struct shmem_inode_info *info; struct shmem_xattr *xattr; int ret = -ENODATA; |
39f0247d3 [PATCH] Access Co... |
1621 |
|
b09e0fa4b tmpfs: implement ... |
1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 |
info = SHMEM_I(dentry->d_inode); spin_lock(&info->lock); list_for_each_entry(xattr, &info->xattr_list, list) { if (strcmp(name, xattr->name)) continue; ret = xattr->size; if (buffer) { if (size < xattr->size) ret = -ERANGE; else memcpy(buffer, xattr->value, xattr->size); } break; } spin_unlock(&info->lock); return ret; |
39f0247d3 [PATCH] Access Co... |
1640 |
} |
b09e0fa4b tmpfs: implement ... |
1641 1642 |
static int shmem_xattr_set(struct dentry *dentry, const char *name, const void *value, size_t size, int flags) |
39f0247d3 [PATCH] Access Co... |
1643 |
{ |
b09e0fa4b tmpfs: implement ... |
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 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 |
struct inode *inode = dentry->d_inode; struct shmem_inode_info *info = SHMEM_I(inode); struct shmem_xattr *xattr; struct shmem_xattr *new_xattr = NULL; size_t len; int err = 0; /* value == NULL means remove */ if (value) { /* wrap around? */ len = sizeof(*new_xattr) + size; if (len <= sizeof(*new_xattr)) return -ENOMEM; new_xattr = kmalloc(len, GFP_KERNEL); if (!new_xattr) return -ENOMEM; new_xattr->name = kstrdup(name, GFP_KERNEL); if (!new_xattr->name) { kfree(new_xattr); return -ENOMEM; } new_xattr->size = size; memcpy(new_xattr->value, value, size); } spin_lock(&info->lock); list_for_each_entry(xattr, &info->xattr_list, list) { if (!strcmp(name, xattr->name)) { if (flags & XATTR_CREATE) { xattr = new_xattr; err = -EEXIST; } else if (new_xattr) { list_replace(&xattr->list, &new_xattr->list); } else { list_del(&xattr->list); } goto out; } } if (flags & XATTR_REPLACE) { xattr = new_xattr; err = -ENODATA; } else { list_add(&new_xattr->list, &info->xattr_list); xattr = NULL; } out: spin_unlock(&info->lock); if (xattr) kfree(xattr->name); kfree(xattr); return err; |
39f0247d3 [PATCH] Access Co... |
1699 |
} |
bb4354538 fs: xattr_handler... |
1700 |
static const struct xattr_handler *shmem_xattr_handlers[] = { |
b09e0fa4b tmpfs: implement ... |
1701 |
#ifdef CONFIG_TMPFS_POSIX_ACL |
1c7c474c3 make generic_acl ... |
1702 1703 |
&generic_acl_access_handler, &generic_acl_default_handler, |
b09e0fa4b tmpfs: implement ... |
1704 |
#endif |
39f0247d3 [PATCH] Access Co... |
1705 1706 |
NULL }; |
b09e0fa4b tmpfs: implement ... |
1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 |
static int shmem_xattr_validate(const char *name) { struct { const char *prefix; size_t len; } arr[] = { { XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN }, { XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN } }; int i; for (i = 0; i < ARRAY_SIZE(arr); i++) { size_t preflen = arr[i].len; if (strncmp(name, arr[i].prefix, preflen) == 0) { if (!name[preflen]) return -EINVAL; return 0; } } return -EOPNOTSUPP; } static ssize_t shmem_getxattr(struct dentry *dentry, const char *name, void *buffer, size_t size) { int err; /* * If this is a request for a synthetic attribute in the system.* * namespace use the generic infrastructure to resolve a handler * for it via sb->s_xattr. */ if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN)) return generic_getxattr(dentry, name, buffer, size); err = shmem_xattr_validate(name); if (err) return err; return shmem_xattr_get(dentry, name, buffer, size); } static int shmem_setxattr(struct dentry *dentry, const char *name, const void *value, size_t size, int flags) { int err; /* * If this is a request for a synthetic attribute in the system.* * namespace use the generic infrastructure to resolve a handler * for it via sb->s_xattr. */ if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN)) return generic_setxattr(dentry, name, value, size, flags); err = shmem_xattr_validate(name); if (err) return err; if (size == 0) value = ""; /* empty EA, do not remove */ return shmem_xattr_set(dentry, name, value, size, flags); } static int shmem_removexattr(struct dentry *dentry, const char *name) { int err; /* * If this is a request for a synthetic attribute in the system.* * namespace use the generic infrastructure to resolve a handler * for it via sb->s_xattr. */ if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN)) return generic_removexattr(dentry, name); err = shmem_xattr_validate(name); if (err) return err; return shmem_xattr_set(dentry, name, NULL, 0, XATTR_REPLACE); } static bool xattr_is_trusted(const char *name) { return !strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN); } static ssize_t shmem_listxattr(struct dentry *dentry, char *buffer, size_t size) { bool trusted = capable(CAP_SYS_ADMIN); struct shmem_xattr *xattr; struct shmem_inode_info *info; size_t used = 0; info = SHMEM_I(dentry->d_inode); spin_lock(&info->lock); list_for_each_entry(xattr, &info->xattr_list, list) { size_t len; /* skip "trusted." attributes for unprivileged callers */ if (!trusted && xattr_is_trusted(xattr->name)) continue; len = strlen(xattr->name) + 1; used += len; if (buffer) { if (size < used) { used = -ERANGE; break; } memcpy(buffer, xattr->name, len); buffer += len; } } spin_unlock(&info->lock); return used; } #endif /* CONFIG_TMPFS_XATTR */ |
69f07ec93 tmpfs: use kmemdu... |
1828 |
static const struct inode_operations shmem_short_symlink_operations = { |
b09e0fa4b tmpfs: implement ... |
1829 |
.readlink = generic_readlink, |
69f07ec93 tmpfs: use kmemdu... |
1830 |
.follow_link = shmem_follow_short_symlink, |
b09e0fa4b tmpfs: implement ... |
1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 |
#ifdef CONFIG_TMPFS_XATTR .setxattr = shmem_setxattr, .getxattr = shmem_getxattr, .listxattr = shmem_listxattr, .removexattr = shmem_removexattr, #endif }; static const struct inode_operations shmem_symlink_inode_operations = { .readlink = generic_readlink, .follow_link = shmem_follow_link, .put_link = shmem_put_link, #ifdef CONFIG_TMPFS_XATTR .setxattr = shmem_setxattr, .getxattr = shmem_getxattr, .listxattr = shmem_listxattr, .removexattr = shmem_removexattr, |
39f0247d3 [PATCH] Access Co... |
1848 |
#endif |
b09e0fa4b tmpfs: implement ... |
1849 |
}; |
39f0247d3 [PATCH] Access Co... |
1850 |
|
91828a405 [PATCH] knfsd: ad... |
1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 |
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; } |
480b116c9 shmem: new export... |
1863 1864 |
static struct dentry *shmem_fh_to_dentry(struct super_block *sb, struct fid *fid, int fh_len, int fh_type) |
91828a405 [PATCH] knfsd: ad... |
1865 |
{ |
91828a405 [PATCH] knfsd: ad... |
1866 |
struct inode *inode; |
480b116c9 shmem: new export... |
1867 1868 1869 1870 1871 1872 |
struct dentry *dentry = NULL; u64 inum = fid->raw[2]; inum = (inum << 32) | fid->raw[1]; if (fh_len < 3) return NULL; |
91828a405 [PATCH] knfsd: ad... |
1873 |
|
480b116c9 shmem: new export... |
1874 1875 |
inode = ilookup5(sb, (unsigned long)(inum + fid->raw[0]), shmem_match, fid->raw); |
91828a405 [PATCH] knfsd: ad... |
1876 |
if (inode) { |
480b116c9 shmem: new export... |
1877 |
dentry = d_find_alias(inode); |
91828a405 [PATCH] knfsd: ad... |
1878 1879 |
iput(inode); } |
480b116c9 shmem: new export... |
1880 |
return dentry; |
91828a405 [PATCH] knfsd: ad... |
1881 1882 1883 1884 1885 1886 |
} static int shmem_encode_fh(struct dentry *dentry, __u32 *fh, int *len, int connectable) { struct inode *inode = dentry->d_inode; |
5fe0c2378 exportfs: Return ... |
1887 1888 |
if (*len < 3) { *len = 3; |
91828a405 [PATCH] knfsd: ad... |
1889 |
return 255; |
5fe0c2378 exportfs: Return ... |
1890 |
} |
91828a405 [PATCH] knfsd: ad... |
1891 |
|
1d3382cbf new helper: inode... |
1892 |
if (inode_unhashed(inode)) { |
91828a405 [PATCH] knfsd: ad... |
1893 1894 1895 1896 1897 1898 1899 |
/* 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... |
1900 |
if (inode_unhashed(inode)) |
91828a405 [PATCH] knfsd: ad... |
1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 |
__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... |
1913 |
static const struct export_operations shmem_export_ops = { |
91828a405 [PATCH] knfsd: ad... |
1914 |
.get_parent = shmem_get_parent, |
91828a405 [PATCH] knfsd: ad... |
1915 |
.encode_fh = shmem_encode_fh, |
480b116c9 shmem: new export... |
1916 |
.fh_to_dentry = shmem_fh_to_dentry, |
91828a405 [PATCH] knfsd: ad... |
1917 |
}; |
680d794ba mount options: fi... |
1918 1919 |
static int shmem_parse_options(char *options, struct shmem_sb_info *sbinfo, bool remount) |
1da177e4c Linux-2.6.12-rc2 |
1920 1921 |
{ char *this_char, *value, *rest; |
b00dc3ad7 [PATCH] tmpfs: fi... |
1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 |
while (options != NULL) { this_char = options; 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; } } |
1da177e4c Linux-2.6.12-rc2 |
1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 |
if (!*this_char) continue; if ((value = strchr(this_char,'=')) != NULL) { *value++ = 0; } else { printk(KERN_ERR "tmpfs: No value for mount option '%s' ", this_char); return 1; } if (!strcmp(this_char,"size")) { unsigned long long size; size = memparse(value,&rest); if (*rest == '%') { size <<= PAGE_SHIFT; size *= totalram_pages; do_div(size, 100); rest++; } if (*rest) goto bad_val; |
680d794ba mount options: fi... |
1962 1963 |
sbinfo->max_blocks = DIV_ROUND_UP(size, PAGE_CACHE_SIZE); |
1da177e4c Linux-2.6.12-rc2 |
1964 |
} else if (!strcmp(this_char,"nr_blocks")) { |
680d794ba mount options: fi... |
1965 |
sbinfo->max_blocks = memparse(value, &rest); |
1da177e4c Linux-2.6.12-rc2 |
1966 1967 1968 |
if (*rest) goto bad_val; } else if (!strcmp(this_char,"nr_inodes")) { |
680d794ba mount options: fi... |
1969 |
sbinfo->max_inodes = memparse(value, &rest); |
1da177e4c Linux-2.6.12-rc2 |
1970 1971 1972 |
if (*rest) goto bad_val; } else if (!strcmp(this_char,"mode")) { |
680d794ba mount options: fi... |
1973 |
if (remount) |
1da177e4c Linux-2.6.12-rc2 |
1974 |
continue; |
680d794ba mount options: fi... |
1975 |
sbinfo->mode = simple_strtoul(value, &rest, 8) & 07777; |
1da177e4c Linux-2.6.12-rc2 |
1976 1977 1978 |
if (*rest) goto bad_val; } else if (!strcmp(this_char,"uid")) { |
680d794ba mount options: fi... |
1979 |
if (remount) |
1da177e4c Linux-2.6.12-rc2 |
1980 |
continue; |
680d794ba mount options: fi... |
1981 |
sbinfo->uid = simple_strtoul(value, &rest, 0); |
1da177e4c Linux-2.6.12-rc2 |
1982 1983 1984 |
if (*rest) goto bad_val; } else if (!strcmp(this_char,"gid")) { |
680d794ba mount options: fi... |
1985 |
if (remount) |
1da177e4c Linux-2.6.12-rc2 |
1986 |
continue; |
680d794ba mount options: fi... |
1987 |
sbinfo->gid = simple_strtoul(value, &rest, 0); |
1da177e4c Linux-2.6.12-rc2 |
1988 1989 |
if (*rest) goto bad_val; |
7339ff830 [PATCH] Add tmpfs... |
1990 |
} else if (!strcmp(this_char,"mpol")) { |
71fe804b6 mempolicy: use st... |
1991 |
if (mpol_parse_str(value, &sbinfo->mpol, 1)) |
7339ff830 [PATCH] Add tmpfs... |
1992 |
goto bad_val; |
1da177e4c Linux-2.6.12-rc2 |
1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 |
} else { printk(KERN_ERR "tmpfs: Bad mount option %s ", this_char); return 1; } } return 0; bad_val: printk(KERN_ERR "tmpfs: Bad value '%s' for mount option '%s' ", value, this_char); return 1; } static int shmem_remount_fs(struct super_block *sb, int *flags, char *data) { struct shmem_sb_info *sbinfo = SHMEM_SB(sb); |
680d794ba mount options: fi... |
2013 |
struct shmem_sb_info config = *sbinfo; |
0edd73b33 [PATCH] shmem: re... |
2014 2015 |
unsigned long inodes; int error = -EINVAL; |
680d794ba mount options: fi... |
2016 |
if (shmem_parse_options(data, &config, true)) |
0edd73b33 [PATCH] shmem: re... |
2017 |
return error; |
1da177e4c Linux-2.6.12-rc2 |
2018 |
|
0edd73b33 [PATCH] shmem: re... |
2019 |
spin_lock(&sbinfo->stat_lock); |
0edd73b33 [PATCH] shmem: re... |
2020 |
inodes = sbinfo->max_inodes - sbinfo->free_inodes; |
7e496299d tmpfs: make tmpfs... |
2021 |
if (percpu_counter_compare(&sbinfo->used_blocks, config.max_blocks) > 0) |
0edd73b33 [PATCH] shmem: re... |
2022 |
goto out; |
680d794ba mount options: fi... |
2023 |
if (config.max_inodes < inodes) |
0edd73b33 [PATCH] shmem: re... |
2024 2025 |
goto out; /* |
54af60421 tmpfs: convert sh... |
2026 |
* Those tests disallow limited->unlimited while any are in use; |
0edd73b33 [PATCH] shmem: re... |
2027 2028 2029 |
* but we must separately disallow unlimited->limited, because * in that case we have no record of how much is already in use. */ |
680d794ba mount options: fi... |
2030 |
if (config.max_blocks && !sbinfo->max_blocks) |
0edd73b33 [PATCH] shmem: re... |
2031 |
goto out; |
680d794ba mount options: fi... |
2032 |
if (config.max_inodes && !sbinfo->max_inodes) |
0edd73b33 [PATCH] shmem: re... |
2033 2034 2035 |
goto out; error = 0; |
680d794ba mount options: fi... |
2036 |
sbinfo->max_blocks = config.max_blocks; |
680d794ba mount options: fi... |
2037 2038 |
sbinfo->max_inodes = config.max_inodes; sbinfo->free_inodes = config.max_inodes - inodes; |
71fe804b6 mempolicy: use st... |
2039 2040 2041 |
mpol_put(sbinfo->mpol); sbinfo->mpol = config.mpol; /* transfers initial ref */ |
0edd73b33 [PATCH] shmem: re... |
2042 2043 2044 |
out: spin_unlock(&sbinfo->stat_lock); return error; |
1da177e4c Linux-2.6.12-rc2 |
2045 |
} |
680d794ba mount options: fi... |
2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 |
static int shmem_show_options(struct seq_file *seq, struct vfsmount *vfs) { struct shmem_sb_info *sbinfo = SHMEM_SB(vfs->mnt_sb); if (sbinfo->max_blocks != shmem_default_max_blocks()) seq_printf(seq, ",size=%luk", sbinfo->max_blocks << (PAGE_CACHE_SHIFT - 10)); if (sbinfo->max_inodes != shmem_default_max_inodes()) seq_printf(seq, ",nr_inodes=%lu", sbinfo->max_inodes); if (sbinfo->mode != (S_IRWXUGO | S_ISVTX)) seq_printf(seq, ",mode=%03o", sbinfo->mode); if (sbinfo->uid != 0) seq_printf(seq, ",uid=%u", sbinfo->uid); if (sbinfo->gid != 0) seq_printf(seq, ",gid=%u", sbinfo->gid); |
71fe804b6 mempolicy: use st... |
2062 |
shmem_show_mpol(seq, sbinfo->mpol); |
680d794ba mount options: fi... |
2063 2064 2065 |
return 0; } #endif /* CONFIG_TMPFS */ |
1da177e4c Linux-2.6.12-rc2 |
2066 2067 2068 |
static void shmem_put_super(struct super_block *sb) { |
602586a83 shmem: put_super ... |
2069 2070 2071 2072 |
struct shmem_sb_info *sbinfo = SHMEM_SB(sb); percpu_counter_destroy(&sbinfo->used_blocks); kfree(sbinfo); |
1da177e4c Linux-2.6.12-rc2 |
2073 2074 |
sb->s_fs_info = NULL; } |
2b2af54a5 Driver Core: devt... |
2075 |
int shmem_fill_super(struct super_block *sb, void *data, int silent) |
1da177e4c Linux-2.6.12-rc2 |
2076 2077 2078 |
{ struct inode *inode; struct dentry *root; |
0edd73b33 [PATCH] shmem: re... |
2079 |
struct shmem_sb_info *sbinfo; |
680d794ba mount options: fi... |
2080 2081 2082 |
int err = -ENOMEM; /* Round up to L1_CACHE_BYTES to resist false sharing */ |
425fbf047 shmem: initialize... |
2083 |
sbinfo = kzalloc(max((int)sizeof(struct shmem_sb_info), |
680d794ba mount options: fi... |
2084 2085 2086 |
L1_CACHE_BYTES), GFP_KERNEL); if (!sbinfo) return -ENOMEM; |
680d794ba mount options: fi... |
2087 |
sbinfo->mode = S_IRWXUGO | S_ISVTX; |
76aac0e9a CRED: Wrap task c... |
2088 2089 |
sbinfo->uid = current_fsuid(); sbinfo->gid = current_fsgid(); |
680d794ba mount options: fi... |
2090 |
sb->s_fs_info = sbinfo; |
1da177e4c Linux-2.6.12-rc2 |
2091 |
|
0edd73b33 [PATCH] shmem: re... |
2092 |
#ifdef CONFIG_TMPFS |
1da177e4c Linux-2.6.12-rc2 |
2093 2094 2095 2096 2097 2098 |
/* * 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. */ if (!(sb->s_flags & MS_NOUSER)) { |
680d794ba mount options: fi... |
2099 2100 2101 2102 2103 2104 |
sbinfo->max_blocks = shmem_default_max_blocks(); sbinfo->max_inodes = shmem_default_max_inodes(); if (shmem_parse_options(data, sbinfo, false)) { err = -EINVAL; goto failed; } |
1da177e4c Linux-2.6.12-rc2 |
2105 |
} |
91828a405 [PATCH] knfsd: ad... |
2106 |
sb->s_export_op = &shmem_export_ops; |
1da177e4c Linux-2.6.12-rc2 |
2107 2108 2109 |
#else sb->s_flags |= MS_NOUSER; #endif |
0edd73b33 [PATCH] shmem: re... |
2110 |
spin_lock_init(&sbinfo->stat_lock); |
602586a83 shmem: put_super ... |
2111 2112 |
if (percpu_counter_init(&sbinfo->used_blocks, 0)) goto failed; |
680d794ba mount options: fi... |
2113 |
sbinfo->free_inodes = sbinfo->max_inodes; |
0edd73b33 [PATCH] shmem: re... |
2114 |
|
285b2c4fd tmpfs: demolish o... |
2115 |
sb->s_maxbytes = MAX_LFS_FILESIZE; |
1da177e4c Linux-2.6.12-rc2 |
2116 2117 2118 2119 |
sb->s_blocksize = PAGE_CACHE_SIZE; sb->s_blocksize_bits = PAGE_CACHE_SHIFT; sb->s_magic = TMPFS_MAGIC; sb->s_op = &shmem_ops; |
cfd95a9cf [PATCH] tmpfs: ti... |
2120 |
sb->s_time_gran = 1; |
b09e0fa4b tmpfs: implement ... |
2121 |
#ifdef CONFIG_TMPFS_XATTR |
39f0247d3 [PATCH] Access Co... |
2122 |
sb->s_xattr = shmem_xattr_handlers; |
b09e0fa4b tmpfs: implement ... |
2123 2124 |
#endif #ifdef CONFIG_TMPFS_POSIX_ACL |
39f0247d3 [PATCH] Access Co... |
2125 2126 |
sb->s_flags |= MS_POSIXACL; #endif |
0edd73b33 [PATCH] shmem: re... |
2127 |
|
454abafe9 ramfs: replace in... |
2128 |
inode = shmem_get_inode(sb, NULL, S_IFDIR | sbinfo->mode, 0, VM_NORESERVE); |
1da177e4c Linux-2.6.12-rc2 |
2129 2130 |
if (!inode) goto failed; |
680d794ba mount options: fi... |
2131 2132 |
inode->i_uid = sbinfo->uid; inode->i_gid = sbinfo->gid; |
1da177e4c Linux-2.6.12-rc2 |
2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 |
root = d_alloc_root(inode); if (!root) goto failed_iput; sb->s_root = root; return 0; failed_iput: iput(inode); failed: shmem_put_super(sb); return err; } |
fcc234f88 [PATCH] mm: kill ... |
2145 |
static struct kmem_cache *shmem_inode_cachep; |
1da177e4c Linux-2.6.12-rc2 |
2146 2147 2148 |
static struct inode *shmem_alloc_inode(struct super_block *sb) { |
41ffe5d5c tmpfs: miscellane... |
2149 2150 2151 |
struct shmem_inode_info *info; info = kmem_cache_alloc(shmem_inode_cachep, GFP_KERNEL); if (!info) |
1da177e4c Linux-2.6.12-rc2 |
2152 |
return NULL; |
41ffe5d5c tmpfs: miscellane... |
2153 |
return &info->vfs_inode; |
1da177e4c Linux-2.6.12-rc2 |
2154 |
} |
41ffe5d5c tmpfs: miscellane... |
2155 |
static void shmem_destroy_callback(struct rcu_head *head) |
fa0d7e3de fs: icache RCU fr... |
2156 2157 2158 2159 2160 |
{ struct inode *inode = container_of(head, struct inode, i_rcu); INIT_LIST_HEAD(&inode->i_dentry); kmem_cache_free(shmem_inode_cachep, SHMEM_I(inode)); } |
1da177e4c Linux-2.6.12-rc2 |
2161 2162 |
static void shmem_destroy_inode(struct inode *inode) { |
69f07ec93 tmpfs: use kmemdu... |
2163 |
if ((inode->i_mode & S_IFMT) == S_IFREG) |
1da177e4c Linux-2.6.12-rc2 |
2164 |
mpol_free_shared_policy(&SHMEM_I(inode)->policy); |
41ffe5d5c tmpfs: miscellane... |
2165 |
call_rcu(&inode->i_rcu, shmem_destroy_callback); |
1da177e4c Linux-2.6.12-rc2 |
2166 |
} |
41ffe5d5c tmpfs: miscellane... |
2167 |
static void shmem_init_inode(void *foo) |
1da177e4c Linux-2.6.12-rc2 |
2168 |
{ |
41ffe5d5c tmpfs: miscellane... |
2169 2170 |
struct shmem_inode_info *info = foo; inode_init_once(&info->vfs_inode); |
1da177e4c Linux-2.6.12-rc2 |
2171 |
} |
41ffe5d5c tmpfs: miscellane... |
2172 |
static int shmem_init_inodecache(void) |
1da177e4c Linux-2.6.12-rc2 |
2173 2174 2175 |
{ shmem_inode_cachep = kmem_cache_create("shmem_inode_cache", sizeof(struct shmem_inode_info), |
41ffe5d5c tmpfs: miscellane... |
2176 |
0, SLAB_PANIC, shmem_init_inode); |
1da177e4c Linux-2.6.12-rc2 |
2177 2178 |
return 0; } |
41ffe5d5c tmpfs: miscellane... |
2179 |
static void shmem_destroy_inodecache(void) |
1da177e4c Linux-2.6.12-rc2 |
2180 |
{ |
1a1d92c10 [PATCH] Really ig... |
2181 |
kmem_cache_destroy(shmem_inode_cachep); |
1da177e4c Linux-2.6.12-rc2 |
2182 |
} |
f5e54d6e5 [PATCH] mark addr... |
2183 |
static const struct address_space_operations shmem_aops = { |
1da177e4c Linux-2.6.12-rc2 |
2184 |
.writepage = shmem_writepage, |
767193253 [PATCH] simplify ... |
2185 |
.set_page_dirty = __set_page_dirty_no_writeback, |
1da177e4c Linux-2.6.12-rc2 |
2186 |
#ifdef CONFIG_TMPFS |
800d15a53 implement simple ... |
2187 2188 |
.write_begin = shmem_write_begin, .write_end = shmem_write_end, |
1da177e4c Linux-2.6.12-rc2 |
2189 |
#endif |
304dbdb7a [PATCH] add migra... |
2190 |
.migratepage = migrate_page, |
aa261f549 HWPOISON: Enable ... |
2191 |
.error_remove_page = generic_error_remove_page, |
1da177e4c Linux-2.6.12-rc2 |
2192 |
}; |
15ad7cdcf [PATCH] struct se... |
2193 |
static const struct file_operations shmem_file_operations = { |
1da177e4c Linux-2.6.12-rc2 |
2194 2195 2196 |
.mmap = shmem_mmap, #ifdef CONFIG_TMPFS .llseek = generic_file_llseek, |
bcd78e496 tmpfs: support aio |
2197 |
.read = do_sync_read, |
5402b976a shmem_file_write ... |
2198 |
.write = do_sync_write, |
bcd78e496 tmpfs: support aio |
2199 |
.aio_read = shmem_file_aio_read, |
5402b976a shmem_file_write ... |
2200 |
.aio_write = generic_file_aio_write, |
1b061d924 rename the generi... |
2201 |
.fsync = noop_fsync, |
708e3508c tmpfs: clone shme... |
2202 |
.splice_read = shmem_file_splice_read, |
ae9764164 shmem: convert to... |
2203 |
.splice_write = generic_file_splice_write, |
1da177e4c Linux-2.6.12-rc2 |
2204 2205 |
#endif }; |
92e1d5be9 [PATCH] mark stru... |
2206 |
static const struct inode_operations shmem_inode_operations = { |
94c1e62df tmpfs: take contr... |
2207 |
.setattr = shmem_setattr, |
f6b3ec238 [PATCH] madvise(M... |
2208 |
.truncate_range = shmem_truncate_range, |
b09e0fa4b tmpfs: implement ... |
2209 2210 2211 2212 2213 2214 |
#ifdef CONFIG_TMPFS_XATTR .setxattr = shmem_setxattr, .getxattr = shmem_getxattr, .listxattr = shmem_listxattr, .removexattr = shmem_removexattr, #endif |
1da177e4c Linux-2.6.12-rc2 |
2215 |
}; |
92e1d5be9 [PATCH] mark stru... |
2216 |
static const struct inode_operations shmem_dir_inode_operations = { |
1da177e4c Linux-2.6.12-rc2 |
2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 |
#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, .rename = shmem_rename, |
1da177e4c Linux-2.6.12-rc2 |
2227 |
#endif |
b09e0fa4b tmpfs: implement ... |
2228 2229 2230 2231 2232 2233 |
#ifdef CONFIG_TMPFS_XATTR .setxattr = shmem_setxattr, .getxattr = shmem_getxattr, .listxattr = shmem_listxattr, .removexattr = shmem_removexattr, #endif |
39f0247d3 [PATCH] Access Co... |
2234 |
#ifdef CONFIG_TMPFS_POSIX_ACL |
94c1e62df tmpfs: take contr... |
2235 |
.setattr = shmem_setattr, |
39f0247d3 [PATCH] Access Co... |
2236 2237 |
#endif }; |
92e1d5be9 [PATCH] mark stru... |
2238 |
static const struct inode_operations shmem_special_inode_operations = { |
b09e0fa4b tmpfs: implement ... |
2239 2240 2241 2242 2243 2244 |
#ifdef CONFIG_TMPFS_XATTR .setxattr = shmem_setxattr, .getxattr = shmem_getxattr, .listxattr = shmem_listxattr, .removexattr = shmem_removexattr, #endif |
39f0247d3 [PATCH] Access Co... |
2245 |
#ifdef CONFIG_TMPFS_POSIX_ACL |
94c1e62df tmpfs: take contr... |
2246 |
.setattr = shmem_setattr, |
39f0247d3 [PATCH] Access Co... |
2247 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
2248 |
}; |
759b9775c [PATCH] shmem and... |
2249 |
static const struct super_operations shmem_ops = { |
1da177e4c Linux-2.6.12-rc2 |
2250 2251 2252 2253 2254 |
.alloc_inode = shmem_alloc_inode, .destroy_inode = shmem_destroy_inode, #ifdef CONFIG_TMPFS .statfs = shmem_statfs, .remount_fs = shmem_remount_fs, |
680d794ba mount options: fi... |
2255 |
.show_options = shmem_show_options, |
1da177e4c Linux-2.6.12-rc2 |
2256 |
#endif |
1f895f75d switch shmem.c to... |
2257 |
.evict_inode = shmem_evict_inode, |
1da177e4c Linux-2.6.12-rc2 |
2258 2259 2260 |
.drop_inode = generic_delete_inode, .put_super = shmem_put_super, }; |
f0f37e2f7 const: mark struc... |
2261 |
static const struct vm_operations_struct shmem_vm_ops = { |
54cb8821d mm: merge populat... |
2262 |
.fault = shmem_fault, |
1da177e4c Linux-2.6.12-rc2 |
2263 2264 2265 2266 2267 |
#ifdef CONFIG_NUMA .set_policy = shmem_set_policy, .get_policy = shmem_get_policy, #endif }; |
3c26ff6e4 convert get_sb_no... |
2268 2269 |
static struct dentry *shmem_mount(struct file_system_type *fs_type, int flags, const char *dev_name, void *data) |
1da177e4c Linux-2.6.12-rc2 |
2270 |
{ |
3c26ff6e4 convert get_sb_no... |
2271 |
return mount_nodev(fs_type, flags, data, shmem_fill_super); |
1da177e4c Linux-2.6.12-rc2 |
2272 |
} |
41ffe5d5c tmpfs: miscellane... |
2273 |
static struct file_system_type shmem_fs_type = { |
1da177e4c Linux-2.6.12-rc2 |
2274 2275 |
.owner = THIS_MODULE, .name = "tmpfs", |
3c26ff6e4 convert get_sb_no... |
2276 |
.mount = shmem_mount, |
1da177e4c Linux-2.6.12-rc2 |
2277 2278 |
.kill_sb = kill_litter_super, }; |
1da177e4c Linux-2.6.12-rc2 |
2279 |
|
41ffe5d5c tmpfs: miscellane... |
2280 |
int __init shmem_init(void) |
1da177e4c Linux-2.6.12-rc2 |
2281 2282 |
{ int error; |
e0bf68dde mm: bdi init hooks |
2283 2284 2285 |
error = bdi_init(&shmem_backing_dev_info); if (error) goto out4; |
41ffe5d5c tmpfs: miscellane... |
2286 |
error = shmem_init_inodecache(); |
1da177e4c Linux-2.6.12-rc2 |
2287 2288 |
if (error) goto out3; |
41ffe5d5c tmpfs: miscellane... |
2289 |
error = register_filesystem(&shmem_fs_type); |
1da177e4c Linux-2.6.12-rc2 |
2290 2291 2292 2293 2294 |
if (error) { printk(KERN_ERR "Could not register tmpfs "); goto out2; } |
95dc112a5 [PATCH] devfs: Re... |
2295 |
|
41ffe5d5c tmpfs: miscellane... |
2296 2297 |
shm_mnt = vfs_kern_mount(&shmem_fs_type, MS_NOUSER, shmem_fs_type.name, NULL); |
1da177e4c Linux-2.6.12-rc2 |
2298 2299 2300 2301 2302 2303 2304 2305 2306 |
if (IS_ERR(shm_mnt)) { error = PTR_ERR(shm_mnt); printk(KERN_ERR "Could not kern_mount tmpfs "); goto out1; } return 0; out1: |
41ffe5d5c tmpfs: miscellane... |
2307 |
unregister_filesystem(&shmem_fs_type); |
1da177e4c Linux-2.6.12-rc2 |
2308 |
out2: |
41ffe5d5c tmpfs: miscellane... |
2309 |
shmem_destroy_inodecache(); |
1da177e4c Linux-2.6.12-rc2 |
2310 |
out3: |
e0bf68dde mm: bdi init hooks |
2311 2312 |
bdi_destroy(&shmem_backing_dev_info); out4: |
1da177e4c Linux-2.6.12-rc2 |
2313 2314 2315 |
shm_mnt = ERR_PTR(error); return error; } |
853ac43ab shmem: unify regu... |
2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 |
#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. */ #include <linux/ramfs.h> |
41ffe5d5c tmpfs: miscellane... |
2329 |
static struct file_system_type shmem_fs_type = { |
853ac43ab shmem: unify regu... |
2330 |
.name = "tmpfs", |
3c26ff6e4 convert get_sb_no... |
2331 |
.mount = ramfs_mount, |
853ac43ab shmem: unify regu... |
2332 2333 |
.kill_sb = kill_litter_super, }; |
41ffe5d5c tmpfs: miscellane... |
2334 |
int __init shmem_init(void) |
853ac43ab shmem: unify regu... |
2335 |
{ |
41ffe5d5c tmpfs: miscellane... |
2336 |
BUG_ON(register_filesystem(&shmem_fs_type) != 0); |
853ac43ab shmem: unify regu... |
2337 |
|
41ffe5d5c tmpfs: miscellane... |
2338 |
shm_mnt = kern_mount(&shmem_fs_type); |
853ac43ab shmem: unify regu... |
2339 2340 2341 2342 |
BUG_ON(IS_ERR(shm_mnt)); return 0; } |
41ffe5d5c tmpfs: miscellane... |
2343 |
int shmem_unuse(swp_entry_t swap, struct page *page) |
853ac43ab shmem: unify regu... |
2344 2345 2346 |
{ return 0; } |
3f96b79ad tmpfs: depend on ... |
2347 2348 2349 2350 |
int shmem_lock(struct file *file, int lock, struct user_struct *user) { return 0; } |
41ffe5d5c tmpfs: miscellane... |
2351 |
void shmem_truncate_range(struct inode *inode, loff_t lstart, loff_t lend) |
94c1e62df tmpfs: take contr... |
2352 |
{ |
41ffe5d5c tmpfs: miscellane... |
2353 |
truncate_inode_pages_range(inode->i_mapping, lstart, lend); |
94c1e62df tmpfs: take contr... |
2354 2355 |
} EXPORT_SYMBOL_GPL(shmem_truncate_range); |
0b0a0806b shmem: fix shared... |
2356 2357 |
#define shmem_vm_ops generic_file_vm_ops #define shmem_file_operations ramfs_file_operations |
454abafe9 ramfs: replace in... |
2358 |
#define shmem_get_inode(sb, dir, mode, dev, flags) ramfs_get_inode(sb, dir, mode, dev) |
0b0a0806b shmem: fix shared... |
2359 2360 |
#define shmem_acct_size(flags, size) 0 #define shmem_unacct_size(flags, size) do {} while (0) |
853ac43ab shmem: unify regu... |
2361 2362 2363 2364 |
#endif /* CONFIG_SHMEM */ /* common code */ |
1da177e4c Linux-2.6.12-rc2 |
2365 |
|
467118102 mm/shmem and tiny... |
2366 |
/** |
1da177e4c Linux-2.6.12-rc2 |
2367 |
* shmem_file_setup - get an unlinked file living in tmpfs |
1da177e4c Linux-2.6.12-rc2 |
2368 2369 |
* @name: name for dentry (to be seen in /proc/<pid>/maps * @size: size to be set for the file |
0b0a0806b shmem: fix shared... |
2370 |
* @flags: VM_NORESERVE suppresses pre-accounting of the entire object size |
1da177e4c Linux-2.6.12-rc2 |
2371 |
*/ |
168f5ac66 mm cleanup: shmem... |
2372 |
struct file *shmem_file_setup(const char *name, loff_t size, unsigned long flags) |
1da177e4c Linux-2.6.12-rc2 |
2373 2374 2375 2376 |
{ int error; struct file *file; struct inode *inode; |
2c48b9c45 switch alloc_file... |
2377 2378 |
struct path path; struct dentry *root; |
1da177e4c Linux-2.6.12-rc2 |
2379 2380 2381 2382 |
struct qstr this; if (IS_ERR(shm_mnt)) return (void *)shm_mnt; |
285b2c4fd tmpfs: demolish o... |
2383 |
if (size < 0 || size > MAX_LFS_FILESIZE) |
1da177e4c Linux-2.6.12-rc2 |
2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 |
return ERR_PTR(-EINVAL); if (shmem_acct_size(flags, size)) return ERR_PTR(-ENOMEM); error = -ENOMEM; this.name = name; this.len = strlen(name); this.hash = 0; /* will go */ root = shm_mnt->mnt_root; |
2c48b9c45 switch alloc_file... |
2394 2395 |
path.dentry = d_alloc(root, &this); if (!path.dentry) |
1da177e4c Linux-2.6.12-rc2 |
2396 |
goto put_memory; |
2c48b9c45 switch alloc_file... |
2397 |
path.mnt = mntget(shm_mnt); |
1da177e4c Linux-2.6.12-rc2 |
2398 |
|
1da177e4c Linux-2.6.12-rc2 |
2399 |
error = -ENOSPC; |
454abafe9 ramfs: replace in... |
2400 |
inode = shmem_get_inode(root->d_sb, NULL, S_IFREG | S_IRWXUGO, 0, flags); |
1da177e4c Linux-2.6.12-rc2 |
2401 |
if (!inode) |
4b42af81f switch shmem_file... |
2402 |
goto put_dentry; |
1da177e4c Linux-2.6.12-rc2 |
2403 |
|
2c48b9c45 switch alloc_file... |
2404 |
d_instantiate(path.dentry, inode); |
1da177e4c Linux-2.6.12-rc2 |
2405 |
inode->i_size = size; |
6d6b77f16 filesystems: add ... |
2406 |
clear_nlink(inode); /* It is unlinked */ |
853ac43ab shmem: unify regu... |
2407 2408 2409 |
#ifndef CONFIG_MMU error = ramfs_nommu_expand_for_mapping(inode, size); if (error) |
4b42af81f switch shmem_file... |
2410 |
goto put_dentry; |
853ac43ab shmem: unify regu... |
2411 |
#endif |
4b42af81f switch shmem_file... |
2412 2413 |
error = -ENFILE; |
2c48b9c45 switch alloc_file... |
2414 |
file = alloc_file(&path, FMODE_WRITE | FMODE_READ, |
4b42af81f switch shmem_file... |
2415 2416 2417 |
&shmem_file_operations); if (!file) goto put_dentry; |
1da177e4c Linux-2.6.12-rc2 |
2418 |
return file; |
1da177e4c Linux-2.6.12-rc2 |
2419 |
put_dentry: |
2c48b9c45 switch alloc_file... |
2420 |
path_put(&path); |
1da177e4c Linux-2.6.12-rc2 |
2421 2422 2423 2424 |
put_memory: shmem_unacct_size(flags, size); return ERR_PTR(error); } |
395e0ddc4 Export shmem_file... |
2425 |
EXPORT_SYMBOL_GPL(shmem_file_setup); |
1da177e4c Linux-2.6.12-rc2 |
2426 |
|
467118102 mm/shmem and tiny... |
2427 |
/** |
1da177e4c Linux-2.6.12-rc2 |
2428 |
* shmem_zero_setup - setup a shared anonymous mapping |
1da177e4c Linux-2.6.12-rc2 |
2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 |
* @vma: the vma to be mmapped is prepared by do_mmap_pgoff */ int shmem_zero_setup(struct vm_area_struct *vma) { struct file *file; loff_t size = vma->vm_end - vma->vm_start; file = shmem_file_setup("dev/zero", size, vma->vm_flags); 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; |
bee4c36a5 shmem: let shared... |
2444 |
vma->vm_flags |= VM_CAN_NONLINEAR; |
1da177e4c Linux-2.6.12-rc2 |
2445 2446 |
return 0; } |
d9d90e5eb tmpfs: add shmem_... |
2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 |
/** * 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... |
2460 2461 |
* 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_... |
2462 2463 2464 2465 |
*/ struct page *shmem_read_mapping_page_gfp(struct address_space *mapping, pgoff_t index, gfp_t gfp) { |
68da9f055 tmpfs: pass gfp t... |
2466 2467 |
#ifdef CONFIG_SHMEM struct inode *inode = mapping->host; |
9276aad6c tmpfs: remove_shm... |
2468 |
struct page *page; |
68da9f055 tmpfs: pass gfp t... |
2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 |
int error; BUG_ON(mapping->a_ops != &shmem_aops); error = shmem_getpage_gfp(inode, index, &page, SGP_CACHE, gfp, NULL); 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_... |
2482 |
return read_cache_page_gfp(mapping, index, gfp); |
68da9f055 tmpfs: pass gfp t... |
2483 |
#endif |
d9d90e5eb tmpfs: add shmem_... |
2484 2485 |
} EXPORT_SYMBOL_GPL(shmem_read_mapping_page_gfp); |