Blame view
mm/shmem.c
108 KB
1da177e4c Linux-2.6.12-rc2 |
1 2 3 4 5 6 7 8 |
/* * 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. |
6922c0c7a tmpfs: convert sh... |
9 10 |
* Copyright (C) 2002-2011 Hugh Dickins. * Copyright (C) 2011 Google Inc. |
0edd73b33 [PATCH] shmem: re... |
11 |
* Copyright (C) 2002-2005 VERITAS Software Corporation. |
1da177e4c Linux-2.6.12-rc2 |
12 13 14 15 16 17 |
* 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> * |
853ac43ab shmem: unify regu... |
18 19 20 |
* tiny-shmem: * Copyright (c) 2004, 2008 Matt Mackall <mpm@selenic.com> * |
1da177e4c Linux-2.6.12-rc2 |
21 22 |
* This file is released under the GPL. */ |
853ac43ab shmem: unify regu... |
23 24 25 26 |
#include <linux/fs.h> #include <linux/init.h> #include <linux/vfs.h> #include <linux/mount.h> |
250297edf mm/shmem.c: remov... |
27 |
#include <linux/ramfs.h> |
caefba174 shmem: respect MA... |
28 |
#include <linux/pagemap.h> |
853ac43ab shmem: unify regu... |
29 30 |
#include <linux/file.h> #include <linux/mm.h> |
46c9a946d shmem: use monoto... |
31 |
#include <linux/random.h> |
174cd4b1e sched/headers: Pr... |
32 |
#include <linux/sched/signal.h> |
b95f1b31b mm: Map most file... |
33 |
#include <linux/export.h> |
853ac43ab shmem: unify regu... |
34 |
#include <linux/swap.h> |
e2e40f2c1 fs: move struct k... |
35 |
#include <linux/uio.h> |
f3f0e1d21 khugepaged: add s... |
36 |
#include <linux/khugepaged.h> |
749df87bd mm/shmem: add hug... |
37 |
#include <linux/hugetlb.h> |
b56a2d8af mm: rid swapoff o... |
38 |
#include <linux/frontswap.h> |
626c3920a shmem_parse_one()... |
39 |
#include <linux/fs_parser.h> |
853ac43ab shmem: unify regu... |
40 |
|
95cc09d66 userfaultfd: shme... |
41 |
#include <asm/tlbflush.h> /* for arch/microblaze update_mmu_cache() */ |
853ac43ab shmem: unify regu... |
42 43 44 |
static struct vfsmount *shm_mnt; #ifdef CONFIG_SHMEM |
1da177e4c Linux-2.6.12-rc2 |
45 46 47 48 49 |
/* * 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. */ |
39f0247d3 [PATCH] Access Co... |
50 |
#include <linux/xattr.h> |
a56942551 knfsd: exportfs: ... |
51 |
#include <linux/exportfs.h> |
1c7c474c3 make generic_acl ... |
52 |
#include <linux/posix_acl.h> |
feda821e7 fs: remove generi... |
53 |
#include <linux/posix_acl_xattr.h> |
1da177e4c Linux-2.6.12-rc2 |
54 |
#include <linux/mman.h> |
1da177e4c Linux-2.6.12-rc2 |
55 56 57 58 |
#include <linux/string.h> #include <linux/slab.h> #include <linux/backing-dev.h> #include <linux/shmem_fs.h> |
1da177e4c Linux-2.6.12-rc2 |
59 |
#include <linux/writeback.h> |
1da177e4c Linux-2.6.12-rc2 |
60 |
#include <linux/blkdev.h> |
bda97eab0 tmpfs: copy trunc... |
61 |
#include <linux/pagevec.h> |
41ffe5d5c tmpfs: miscellane... |
62 |
#include <linux/percpu_counter.h> |
83e4fa9c1 tmpfs: support fa... |
63 |
#include <linux/falloc.h> |
708e3508c tmpfs: clone shme... |
64 |
#include <linux/splice.h> |
1da177e4c Linux-2.6.12-rc2 |
65 66 67 68 |
#include <linux/security.h> #include <linux/swapops.h> #include <linux/mempolicy.h> #include <linux/namei.h> |
b00dc3ad7 [PATCH] tmpfs: fi... |
69 |
#include <linux/ctype.h> |
304dbdb7a [PATCH] add migra... |
70 |
#include <linux/migrate.h> |
c1f60a5a4 [PATCH] reduce MA... |
71 |
#include <linux/highmem.h> |
680d794ba mount options: fi... |
72 |
#include <linux/seq_file.h> |
925629278 integrity: specia... |
73 |
#include <linux/magic.h> |
9183df25f shm: add memfd_cr... |
74 |
#include <linux/syscalls.h> |
40e041a2c shm: add sealing API |
75 |
#include <linux/fcntl.h> |
9183df25f shm: add memfd_cr... |
76 |
#include <uapi/linux/memfd.h> |
cfda05267 userfaultfd: shme... |
77 |
#include <linux/userfaultfd_k.h> |
4c27fe4c4 userfaultfd: shme... |
78 |
#include <linux/rmap.h> |
2b4db7961 tmpfs: generate r... |
79 |
#include <linux/uuid.h> |
304dbdb7a [PATCH] add migra... |
80 |
|
7c0f6ba68 Replace <asm/uacc... |
81 |
#include <linux/uaccess.h> |
1da177e4c Linux-2.6.12-rc2 |
82 |
#include <asm/pgtable.h> |
dd56b0464 mm: page_alloc: h... |
83 |
#include "internal.h" |
09cbfeaf1 mm, fs: get rid o... |
84 85 |
#define BLOCKS_PER_PAGE (PAGE_SIZE/512) #define VM_ACCT(size) (PAGE_ALIGN(size) >> PAGE_SHIFT) |
1da177e4c Linux-2.6.12-rc2 |
86 |
|
1da177e4c Linux-2.6.12-rc2 |
87 88 |
/* Pretend that each entry is of this size in directory's i_size */ #define BOGO_DIRENT_SIZE 20 |
69f07ec93 tmpfs: use kmemdu... |
89 90 |
/* Symlink up to this size is kmalloc'ed instead of using a swappable page */ #define SHORT_SYMLINK_LEN 128 |
1aac14003 tmpfs: quit when ... |
91 |
/* |
f00cdc6df shmem: fix faulti... |
92 93 94 |
* shmem_fallocate communicates with shmem_fault or shmem_writepage via * inode->i_private (with i_mutex making sure that it has only one user at * a time): we would prefer not to enlarge the shmem inode just for that. |
1aac14003 tmpfs: quit when ... |
95 96 |
*/ struct shmem_falloc { |
8e205f779 shmem: fix faulti... |
97 |
wait_queue_head_t *waitq; /* faults into hole wait for punch to end */ |
1aac14003 tmpfs: quit when ... |
98 99 100 101 102 |
pgoff_t start; /* start of range currently being fallocated */ pgoff_t next; /* the next page offset to be fallocated */ pgoff_t nr_falloced; /* how many new pages have been fallocated */ pgoff_t nr_unswapped; /* how often writepage refused to swap out */ }; |
0b5071dd3 shmem_parse_optio... |
103 104 105 106 107 108 109 110 111 112 113 114 115 |
struct shmem_options { unsigned long long blocks; unsigned long long inodes; struct mempolicy *mpol; kuid_t uid; kgid_t gid; umode_t mode; int huge; int seen; #define SHMEM_SEEN_BLOCKS 1 #define SHMEM_SEEN_INODES 2 #define SHMEM_SEEN_HUGE 4 }; |
b76db7354 mount-options-fix... |
116 |
#ifdef CONFIG_TMPFS |
680d794ba mount options: fi... |
117 118 |
static unsigned long shmem_default_max_blocks(void) { |
ca79b0c21 mm: convert total... |
119 |
return totalram_pages() / 2; |
680d794ba mount options: fi... |
120 121 122 123 |
} static unsigned long shmem_default_max_inodes(void) { |
ca79b0c21 mm: convert total... |
124 125 126 |
unsigned long nr_pages = totalram_pages(); return min(nr_pages - totalhigh_pages(), nr_pages / 2); |
680d794ba mount options: fi... |
127 |
} |
b76db7354 mount-options-fix... |
128 |
#endif |
680d794ba mount options: fi... |
129 |
|
bde05d1cc shmem: replace pa... |
130 131 132 |
static bool shmem_should_replace_page(struct page *page, gfp_t gfp); static int shmem_replace_page(struct page **pagep, gfp_t gfp, struct shmem_inode_info *info, pgoff_t index); |
c5bf121e4 mm: refactor swap... |
133 134 135 136 |
static int shmem_swapin_page(struct inode *inode, pgoff_t index, struct page **pagep, enum sgp_type sgp, gfp_t gfp, struct vm_area_struct *vma, vm_fault_t *fault_type); |
68da9f055 tmpfs: pass gfp t... |
137 |
static int shmem_getpage_gfp(struct inode *inode, pgoff_t index, |
9e18eb293 tmpfs: mem_cgroup... |
138 |
struct page **pagep, enum sgp_type sgp, |
cfda05267 userfaultfd: shme... |
139 |
gfp_t gfp, struct vm_area_struct *vma, |
2b7403035 mm: Change return... |
140 |
struct vm_fault *vmf, vm_fault_t *fault_type); |
68da9f055 tmpfs: pass gfp t... |
141 |
|
f3f0e1d21 khugepaged: add s... |
142 |
int shmem_getpage(struct inode *inode, pgoff_t index, |
9e18eb293 tmpfs: mem_cgroup... |
143 |
struct page **pagep, enum sgp_type sgp) |
68da9f055 tmpfs: pass gfp t... |
144 145 |
{ return shmem_getpage_gfp(inode, index, pagep, sgp, |
cfda05267 userfaultfd: shme... |
146 |
mapping_gfp_mask(inode->i_mapping), NULL, NULL, NULL); |
68da9f055 tmpfs: pass gfp t... |
147 |
} |
1da177e4c Linux-2.6.12-rc2 |
148 |
|
1da177e4c Linux-2.6.12-rc2 |
149 150 151 152 153 154 155 156 157 158 159 160 161 |
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) { |
0b0a0806b shmem: fix shared... |
162 |
return (flags & VM_NORESERVE) ? |
191c54244 mm: collapse secu... |
163 |
0 : security_vm_enough_memory_mm(current->mm, VM_ACCT(size)); |
1da177e4c Linux-2.6.12-rc2 |
164 165 166 167 |
} static inline void shmem_unacct_size(unsigned long flags, loff_t size) { |
0b0a0806b shmem: fix shared... |
168 |
if (!(flags & VM_NORESERVE)) |
1da177e4c Linux-2.6.12-rc2 |
169 170 |
vm_unacct_memory(VM_ACCT(size)); } |
771425179 shmem: update mem... |
171 172 173 174 175 176 177 178 179 180 181 182 |
static inline int shmem_reacct_size(unsigned long flags, loff_t oldsize, loff_t newsize) { if (!(flags & VM_NORESERVE)) { if (VM_ACCT(newsize) > VM_ACCT(oldsize)) return security_vm_enough_memory_mm(current->mm, VM_ACCT(newsize) - VM_ACCT(oldsize)); else if (VM_ACCT(newsize) < VM_ACCT(oldsize)) vm_unacct_memory(VM_ACCT(oldsize) - VM_ACCT(newsize)); } return 0; } |
1da177e4c Linux-2.6.12-rc2 |
183 184 |
/* * ... whereas tmpfs objects are accounted incrementally as |
75edd345e tmpfs: preliminar... |
185 |
* pages are allocated, in order to allow large sparse files. |
1da177e4c Linux-2.6.12-rc2 |
186 187 188 |
* 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. */ |
800d8c63b shmem: add huge p... |
189 |
static inline int shmem_acct_block(unsigned long flags, long pages) |
1da177e4c Linux-2.6.12-rc2 |
190 |
{ |
800d8c63b shmem: add huge p... |
191 192 193 194 195 |
if (!(flags & VM_NORESERVE)) return 0; return security_vm_enough_memory_mm(current->mm, pages * VM_ACCT(PAGE_SIZE)); |
1da177e4c Linux-2.6.12-rc2 |
196 197 198 199 |
} static inline void shmem_unacct_blocks(unsigned long flags, long pages) { |
0b0a0806b shmem: fix shared... |
200 |
if (flags & VM_NORESERVE) |
09cbfeaf1 mm, fs: get rid o... |
201 |
vm_unacct_memory(pages * VM_ACCT(PAGE_SIZE)); |
1da177e4c Linux-2.6.12-rc2 |
202 |
} |
0f0796945 shmem: introduce ... |
203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 |
static inline bool shmem_inode_acct_block(struct inode *inode, long pages) { struct shmem_inode_info *info = SHMEM_I(inode); struct shmem_sb_info *sbinfo = SHMEM_SB(inode->i_sb); if (shmem_acct_block(info->flags, pages)) return false; if (sbinfo->max_blocks) { if (percpu_counter_compare(&sbinfo->used_blocks, sbinfo->max_blocks - pages) > 0) goto unacct; percpu_counter_add(&sbinfo->used_blocks, pages); } return true; unacct: shmem_unacct_blocks(info->flags, pages); return false; } static inline void shmem_inode_unacct_blocks(struct inode *inode, long pages) { struct shmem_inode_info *info = SHMEM_I(inode); struct shmem_sb_info *sbinfo = SHMEM_SB(inode->i_sb); if (sbinfo->max_blocks) percpu_counter_sub(&sbinfo->used_blocks, pages); shmem_unacct_blocks(info->flags, pages); } |
759b9775c [PATCH] shmem and... |
234 |
static const struct super_operations shmem_ops; |
f5e54d6e5 [PATCH] mark addr... |
235 |
static const struct address_space_operations shmem_aops; |
15ad7cdcf [PATCH] struct se... |
236 |
static const struct file_operations shmem_file_operations; |
92e1d5be9 [PATCH] mark stru... |
237 238 239 |
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; |
f0f37e2f7 const: mark struc... |
240 |
static const struct vm_operations_struct shmem_vm_ops; |
779750d20 shmem: split huge... |
241 |
static struct file_system_type shmem_fs_type; |
1da177e4c Linux-2.6.12-rc2 |
242 |
|
b0506e488 userfaultfd: shme... |
243 244 245 246 |
bool vma_is_shmem(struct vm_area_struct *vma) { return vma->vm_ops == &shmem_vm_ops; } |
1da177e4c Linux-2.6.12-rc2 |
247 |
static LIST_HEAD(shmem_swaplist); |
cb5f7b9a4 tmpfs: make shmem... |
248 |
static DEFINE_MUTEX(shmem_swaplist_mutex); |
1da177e4c Linux-2.6.12-rc2 |
249 |
|
5b04c6890 shmem: factor out... |
250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 |
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); } } |
467118102 mm/shmem and tiny... |
274 |
/** |
41ffe5d5c tmpfs: miscellane... |
275 |
* shmem_recalc_inode - recalculate the block usage of an inode |
1da177e4c Linux-2.6.12-rc2 |
276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 |
* @inode: inode to recalc * * We have to calculate the free blocks since the mm can drop * undirtied hole pages behind our back. * * But normally info->alloced == inode->i_mapping->nrpages + info->swapped * So mm freed is info->alloced - (inode->i_mapping->nrpages + info->swapped) * * It has to be called with the spinlock held. */ static void shmem_recalc_inode(struct inode *inode) { struct shmem_inode_info *info = SHMEM_I(inode); long freed; freed = info->alloced - info->swapped - inode->i_mapping->nrpages; if (freed > 0) { info->alloced -= freed; |
54af60421 tmpfs: convert sh... |
294 |
inode->i_blocks -= freed * BLOCKS_PER_PAGE; |
0f0796945 shmem: introduce ... |
295 |
shmem_inode_unacct_blocks(inode, freed); |
1da177e4c Linux-2.6.12-rc2 |
296 297 |
} } |
800d8c63b shmem: add huge p... |
298 299 300 |
bool shmem_charge(struct inode *inode, long pages) { struct shmem_inode_info *info = SHMEM_I(inode); |
4595ef88d shmem: make shmem... |
301 |
unsigned long flags; |
800d8c63b shmem: add huge p... |
302 |
|
0f0796945 shmem: introduce ... |
303 |
if (!shmem_inode_acct_block(inode, pages)) |
800d8c63b shmem: add huge p... |
304 |
return false; |
b1cc94ab2 shmem: shmem_char... |
305 |
|
aaa52e340 mm/khugepaged: fi... |
306 307 |
/* nrpages adjustment first, then shmem_recalc_inode() when balanced */ inode->i_mapping->nrpages += pages; |
4595ef88d shmem: make shmem... |
308 |
spin_lock_irqsave(&info->lock, flags); |
800d8c63b shmem: add huge p... |
309 310 311 |
info->alloced += pages; inode->i_blocks += pages * BLOCKS_PER_PAGE; shmem_recalc_inode(inode); |
4595ef88d shmem: make shmem... |
312 |
spin_unlock_irqrestore(&info->lock, flags); |
800d8c63b shmem: add huge p... |
313 |
|
800d8c63b shmem: add huge p... |
314 315 316 317 318 319 |
return true; } void shmem_uncharge(struct inode *inode, long pages) { struct shmem_inode_info *info = SHMEM_I(inode); |
4595ef88d shmem: make shmem... |
320 |
unsigned long flags; |
800d8c63b shmem: add huge p... |
321 |
|
aaa52e340 mm/khugepaged: fi... |
322 |
/* nrpages adjustment done by __delete_from_page_cache() or caller */ |
4595ef88d shmem: make shmem... |
323 |
spin_lock_irqsave(&info->lock, flags); |
800d8c63b shmem: add huge p... |
324 325 326 |
info->alloced -= pages; inode->i_blocks -= pages * BLOCKS_PER_PAGE; shmem_recalc_inode(inode); |
4595ef88d shmem: make shmem... |
327 |
spin_unlock_irqrestore(&info->lock, flags); |
800d8c63b shmem: add huge p... |
328 |
|
0f0796945 shmem: introduce ... |
329 |
shmem_inode_unacct_blocks(inode, pages); |
800d8c63b shmem: add huge p... |
330 |
} |
7a5d0fbb2 tmpfs: convert sh... |
331 |
/* |
62f945b6a shmem: Convert sh... |
332 |
* Replace item expected in xarray by a new item, while holding xa_lock. |
7a5d0fbb2 tmpfs: convert sh... |
333 |
*/ |
62f945b6a shmem: Convert sh... |
334 |
static int shmem_replace_entry(struct address_space *mapping, |
7a5d0fbb2 tmpfs: convert sh... |
335 336 |
pgoff_t index, void *expected, void *replacement) { |
62f945b6a shmem: Convert sh... |
337 |
XA_STATE(xas, &mapping->i_pages, index); |
6dbaf22ce mm: shmem: save o... |
338 |
void *item; |
7a5d0fbb2 tmpfs: convert sh... |
339 340 |
VM_BUG_ON(!expected); |
6dbaf22ce mm: shmem: save o... |
341 |
VM_BUG_ON(!replacement); |
62f945b6a shmem: Convert sh... |
342 |
item = xas_load(&xas); |
7a5d0fbb2 tmpfs: convert sh... |
343 344 |
if (item != expected) return -ENOENT; |
62f945b6a shmem: Convert sh... |
345 |
xas_store(&xas, replacement); |
7a5d0fbb2 tmpfs: convert sh... |
346 347 348 349 |
return 0; } /* |
d18992286 shmem: fix negati... |
350 351 352 353 354 355 356 357 358 |
* Sometimes, before we decide whether to proceed or to fail, we must check * that an entry was not already brought back from swap by a racing thread. * * Checking page is not enough: by the time a SwapCache page is locked, it * might be reused, and again be SwapCache, using the same swap as before. */ static bool shmem_confirm_swap(struct address_space *mapping, pgoff_t index, swp_entry_t swap) { |
a12831bf4 shmem: Convert sh... |
359 |
return xa_load(&mapping->i_pages, index) == swp_to_radix_entry(swap); |
d18992286 shmem: fix negati... |
360 361 362 |
} /* |
5a6e75f81 shmem: prepare hu... |
363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 |
* Definitions for "huge tmpfs": tmpfs mounted with the huge= option * * SHMEM_HUGE_NEVER: * disables huge pages for the mount; * SHMEM_HUGE_ALWAYS: * enables huge pages for the mount; * SHMEM_HUGE_WITHIN_SIZE: * only allocate huge pages if the page will be fully within i_size, * also respect fadvise()/madvise() hints; * SHMEM_HUGE_ADVISE: * only allocate huge pages if requested with fadvise()/madvise(); */ #define SHMEM_HUGE_NEVER 0 #define SHMEM_HUGE_ALWAYS 1 #define SHMEM_HUGE_WITHIN_SIZE 2 #define SHMEM_HUGE_ADVISE 3 /* * Special values. * Only can be set via /sys/kernel/mm/transparent_hugepage/shmem_enabled: * * SHMEM_HUGE_DENY: * disables huge on shm_mnt and all mounts, for emergency use; * SHMEM_HUGE_FORCE: * enables huge on shm_mnt and all mounts, w/o needing option, for testing; * */ #define SHMEM_HUGE_DENY (-1) #define SHMEM_HUGE_FORCE (-2) |
e496cf3d7 thp: introduce CO... |
393 |
#ifdef CONFIG_TRANSPARENT_HUGE_PAGECACHE |
5a6e75f81 shmem: prepare hu... |
394 |
/* ifdef here to avoid bloating shmem.o when not necessary */ |
5b9c98f30 mm/shmem: add __r... |
395 |
static int shmem_huge __read_mostly; |
5a6e75f81 shmem: prepare hu... |
396 |
|
e5f2249ab mm/shmem.c: fix u... |
397 |
#if defined(CONFIG_SYSFS) |
5a6e75f81 shmem: prepare hu... |
398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 |
static int shmem_parse_huge(const char *str) { if (!strcmp(str, "never")) return SHMEM_HUGE_NEVER; if (!strcmp(str, "always")) return SHMEM_HUGE_ALWAYS; if (!strcmp(str, "within_size")) return SHMEM_HUGE_WITHIN_SIZE; if (!strcmp(str, "advise")) return SHMEM_HUGE_ADVISE; if (!strcmp(str, "deny")) return SHMEM_HUGE_DENY; if (!strcmp(str, "force")) return SHMEM_HUGE_FORCE; return -EINVAL; } |
e5f2249ab mm/shmem.c: fix u... |
414 |
#endif |
5a6e75f81 shmem: prepare hu... |
415 |
|
e5f2249ab mm/shmem.c: fix u... |
416 |
#if defined(CONFIG_SYSFS) || defined(CONFIG_TMPFS) |
5a6e75f81 shmem: prepare hu... |
417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 |
static const char *shmem_format_huge(int huge) { switch (huge) { case SHMEM_HUGE_NEVER: return "never"; case SHMEM_HUGE_ALWAYS: return "always"; case SHMEM_HUGE_WITHIN_SIZE: return "within_size"; case SHMEM_HUGE_ADVISE: return "advise"; case SHMEM_HUGE_DENY: return "deny"; case SHMEM_HUGE_FORCE: return "force"; default: VM_BUG_ON(1); return "bad_val"; } } |
f1f5929cd shmem: fix compil... |
437 |
#endif |
5a6e75f81 shmem: prepare hu... |
438 |
|
779750d20 shmem: split huge... |
439 440 441 442 |
static unsigned long shmem_unused_huge_shrink(struct shmem_sb_info *sbinfo, struct shrink_control *sc, unsigned long nr_to_split) { LIST_HEAD(list), *pos, *next; |
253fd0f02 shmem: fix sleepi... |
443 |
LIST_HEAD(to_remove); |
779750d20 shmem: split huge... |
444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 |
struct inode *inode; struct shmem_inode_info *info; struct page *page; unsigned long batch = sc ? sc->nr_to_scan : 128; int removed = 0, split = 0; if (list_empty(&sbinfo->shrinklist)) return SHRINK_STOP; spin_lock(&sbinfo->shrinklist_lock); list_for_each_safe(pos, next, &sbinfo->shrinklist) { info = list_entry(pos, struct shmem_inode_info, shrinklist); /* pin the inode */ inode = igrab(&info->vfs_inode); /* inode is about to be evicted */ if (!inode) { list_del_init(&info->shrinklist); removed++; goto next; } /* Check if there's anything to gain */ if (round_up(inode->i_size, PAGE_SIZE) == round_up(inode->i_size, HPAGE_PMD_SIZE)) { |
253fd0f02 shmem: fix sleepi... |
470 |
list_move(&info->shrinklist, &to_remove); |
779750d20 shmem: split huge... |
471 |
removed++; |
779750d20 shmem: split huge... |
472 473 474 475 476 477 478 479 480 |
goto next; } list_move(&info->shrinklist, &list); next: if (!--batch) break; } spin_unlock(&sbinfo->shrinklist_lock); |
253fd0f02 shmem: fix sleepi... |
481 482 483 484 485 486 |
list_for_each_safe(pos, next, &to_remove) { info = list_entry(pos, struct shmem_inode_info, shrinklist); inode = &info->vfs_inode; list_del_init(&info->shrinklist); iput(inode); } |
779750d20 shmem: split huge... |
487 488 489 490 491 |
list_for_each_safe(pos, next, &list) { int ret; info = list_entry(pos, struct shmem_inode_info, shrinklist); inode = &info->vfs_inode; |
b3cd54b25 mm/shmem: do not ... |
492 493 |
if (nr_to_split && split >= nr_to_split) goto leave; |
779750d20 shmem: split huge... |
494 |
|
b3cd54b25 mm/shmem: do not ... |
495 |
page = find_get_page(inode->i_mapping, |
779750d20 shmem: split huge... |
496 497 498 |
(inode->i_size & HPAGE_PMD_MASK) >> PAGE_SHIFT); if (!page) goto drop; |
b3cd54b25 mm/shmem: do not ... |
499 |
/* No huge page at the end of the file: nothing to split */ |
779750d20 shmem: split huge... |
500 |
if (!PageTransHuge(page)) { |
779750d20 shmem: split huge... |
501 502 503 |
put_page(page); goto drop; } |
b3cd54b25 mm/shmem: do not ... |
504 505 506 507 508 509 510 511 512 513 514 |
/* * Leave the inode on the list if we failed to lock * the page at this time. * * Waiting for the lock may lead to deadlock in the * reclaim path. */ if (!trylock_page(page)) { put_page(page); goto leave; } |
779750d20 shmem: split huge... |
515 516 517 |
ret = split_huge_page(page); unlock_page(page); put_page(page); |
b3cd54b25 mm/shmem: do not ... |
518 519 520 |
/* If split failed leave the inode on the list */ if (ret) goto leave; |
779750d20 shmem: split huge... |
521 522 523 524 525 |
split++; drop: list_del_init(&info->shrinklist); removed++; |
b3cd54b25 mm/shmem: do not ... |
526 |
leave: |
779750d20 shmem: split huge... |
527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 |
iput(inode); } spin_lock(&sbinfo->shrinklist_lock); list_splice_tail(&list, &sbinfo->shrinklist); sbinfo->shrinklist_len -= removed; spin_unlock(&sbinfo->shrinklist_lock); return split; } static long shmem_unused_huge_scan(struct super_block *sb, struct shrink_control *sc) { struct shmem_sb_info *sbinfo = SHMEM_SB(sb); if (!READ_ONCE(sbinfo->shrinklist_len)) return SHRINK_STOP; return shmem_unused_huge_shrink(sbinfo, sc, 0); } static long shmem_unused_huge_count(struct super_block *sb, struct shrink_control *sc) { struct shmem_sb_info *sbinfo = SHMEM_SB(sb); return READ_ONCE(sbinfo->shrinklist_len); } |
e496cf3d7 thp: introduce CO... |
555 |
#else /* !CONFIG_TRANSPARENT_HUGE_PAGECACHE */ |
5a6e75f81 shmem: prepare hu... |
556 557 |
#define shmem_huge SHMEM_HUGE_DENY |
779750d20 shmem: split huge... |
558 559 560 561 562 |
static unsigned long shmem_unused_huge_shrink(struct shmem_sb_info *sbinfo, struct shrink_control *sc, unsigned long nr_to_split) { return 0; } |
e496cf3d7 thp: introduce CO... |
563 |
#endif /* CONFIG_TRANSPARENT_HUGE_PAGECACHE */ |
5a6e75f81 shmem: prepare hu... |
564 |
|
89fdcd262 mm: shmem: make s... |
565 566 567 568 569 570 571 572 |
static inline bool is_huge_enabled(struct shmem_sb_info *sbinfo) { if (IS_ENABLED(CONFIG_TRANSPARENT_HUGE_PAGECACHE) && (shmem_huge == SHMEM_HUGE_FORCE || sbinfo->huge) && shmem_huge != SHMEM_HUGE_DENY) return true; return false; } |
5a6e75f81 shmem: prepare hu... |
573 |
/* |
46f65ec15 tmpfs: convert sh... |
574 575 576 577 |
* 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, |
552446a41 shmem: Convert sh... |
578 |
pgoff_t index, void *expected, gfp_t gfp) |
46f65ec15 tmpfs: convert sh... |
579 |
{ |
552446a41 shmem: Convert sh... |
580 581 |
XA_STATE_ORDER(xas, &mapping->i_pages, index, compound_order(page)); unsigned long i = 0; |
d8c6546b1 mm: introduce com... |
582 |
unsigned long nr = compound_nr(page); |
46f65ec15 tmpfs: convert sh... |
583 |
|
800d8c63b shmem: add huge p... |
584 585 |
VM_BUG_ON_PAGE(PageTail(page), page); VM_BUG_ON_PAGE(index != round_down(index, nr), page); |
309381fea mm: dump page whe... |
586 587 |
VM_BUG_ON_PAGE(!PageLocked(page), page); VM_BUG_ON_PAGE(!PageSwapBacked(page), page); |
800d8c63b shmem: add huge p... |
588 |
VM_BUG_ON(expected && PageTransHuge(page)); |
46f65ec15 tmpfs: convert sh... |
589 |
|
800d8c63b shmem: add huge p... |
590 |
page_ref_add(page, nr); |
b065b4321 shmem: cleanup sh... |
591 592 |
page->mapping = mapping; page->index = index; |
552446a41 shmem: Convert sh... |
593 594 595 596 597 598 599 600 601 602 |
do { void *entry; xas_lock_irq(&xas); entry = xas_find_conflict(&xas); if (entry != expected) xas_set_err(&xas, -EEXIST); xas_create_range(&xas); if (xas_error(&xas)) goto unlock; next: |
4101196b1 mm: page cache: s... |
603 |
xas_store(&xas, page); |
552446a41 shmem: Convert sh... |
604 605 606 |
if (++i < nr) { xas_next(&xas); goto next; |
800d8c63b shmem: add huge p... |
607 |
} |
552446a41 shmem: Convert sh... |
608 |
if (PageTransHuge(page)) { |
800d8c63b shmem: add huge p... |
609 |
count_vm_event(THP_FILE_ALLOC); |
552446a41 shmem: Convert sh... |
610 |
__inc_node_page_state(page, NR_SHMEM_THPS); |
800d8c63b shmem: add huge p... |
611 |
} |
800d8c63b shmem: add huge p... |
612 |
mapping->nrpages += nr; |
11fb99898 mm: move most fil... |
613 614 |
__mod_node_page_state(page_pgdat(page), NR_FILE_PAGES, nr); __mod_node_page_state(page_pgdat(page), NR_SHMEM, nr); |
552446a41 shmem: Convert sh... |
615 616 617 618 619 |
unlock: xas_unlock_irq(&xas); } while (xas_nomem(&xas, gfp)); if (xas_error(&xas)) { |
b065b4321 shmem: cleanup sh... |
620 |
page->mapping = NULL; |
800d8c63b shmem: add huge p... |
621 |
page_ref_sub(page, nr); |
552446a41 shmem: Convert sh... |
622 |
return xas_error(&xas); |
46f65ec15 tmpfs: convert sh... |
623 |
} |
552446a41 shmem: Convert sh... |
624 625 |
return 0; |
46f65ec15 tmpfs: convert sh... |
626 627 628 |
} /* |
6922c0c7a tmpfs: convert sh... |
629 630 631 632 633 634 |
* Like delete_from_page_cache, but substitutes swap for page. */ static void shmem_delete_from_page_cache(struct page *page, void *radswap) { struct address_space *mapping = page->mapping; int error; |
800d8c63b shmem: add huge p... |
635 |
VM_BUG_ON_PAGE(PageCompound(page), page); |
b93b01631 page cache: use x... |
636 |
xa_lock_irq(&mapping->i_pages); |
62f945b6a shmem: Convert sh... |
637 |
error = shmem_replace_entry(mapping, page->index, page, radswap); |
6922c0c7a tmpfs: convert sh... |
638 639 |
page->mapping = NULL; mapping->nrpages--; |
11fb99898 mm: move most fil... |
640 641 |
__dec_node_page_state(page, NR_FILE_PAGES); __dec_node_page_state(page, NR_SHMEM); |
b93b01631 page cache: use x... |
642 |
xa_unlock_irq(&mapping->i_pages); |
09cbfeaf1 mm, fs: get rid o... |
643 |
put_page(page); |
6922c0c7a tmpfs: convert sh... |
644 645 646 647 |
BUG_ON(error); } /* |
c121d3bb7 shmem: Convert sh... |
648 |
* Remove swap entry from page cache, free the swap and its page cache. |
7a5d0fbb2 tmpfs: convert sh... |
649 650 651 652 |
*/ static int shmem_free_swap(struct address_space *mapping, pgoff_t index, void *radswap) { |
6dbaf22ce mm: shmem: save o... |
653 |
void *old; |
7a5d0fbb2 tmpfs: convert sh... |
654 |
|
55f3f7eab XArray: Add xa_cm... |
655 |
old = xa_cmpxchg_irq(&mapping->i_pages, index, radswap, NULL, 0); |
6dbaf22ce mm: shmem: save o... |
656 657 658 659 |
if (old != radswap) return -ENOENT; free_swap_and_cache(radix_to_swp_entry(radswap)); return 0; |
7a5d0fbb2 tmpfs: convert sh... |
660 661 662 |
} /* |
6a15a3709 mm, proc: reduce ... |
663 |
* Determine (in bytes) how many of the shmem object's pages mapped by the |
48131e03c mm, proc: reduce ... |
664 |
* given offsets are swapped out. |
6a15a3709 mm, proc: reduce ... |
665 |
* |
b93b01631 page cache: use x... |
666 |
* This is safe to call without i_mutex or the i_pages lock thanks to RCU, |
6a15a3709 mm, proc: reduce ... |
667 668 |
* as long as the inode doesn't go away and racy results are not a problem. */ |
48131e03c mm, proc: reduce ... |
669 670 |
unsigned long shmem_partial_swap_usage(struct address_space *mapping, pgoff_t start, pgoff_t end) |
6a15a3709 mm, proc: reduce ... |
671 |
{ |
7ae3424fb shmem: Convert sh... |
672 |
XA_STATE(xas, &mapping->i_pages, start); |
6a15a3709 mm, proc: reduce ... |
673 |
struct page *page; |
48131e03c mm, proc: reduce ... |
674 |
unsigned long swapped = 0; |
6a15a3709 mm, proc: reduce ... |
675 676 |
rcu_read_lock(); |
7ae3424fb shmem: Convert sh... |
677 678 |
xas_for_each(&xas, page, end - 1) { if (xas_retry(&xas, page)) |
2cf938aae mm: use radix_tre... |
679 |
continue; |
3159f943a xarray: Replace e... |
680 |
if (xa_is_value(page)) |
6a15a3709 mm, proc: reduce ... |
681 682 683 |
swapped++; if (need_resched()) { |
7ae3424fb shmem: Convert sh... |
684 |
xas_pause(&xas); |
6a15a3709 mm, proc: reduce ... |
685 |
cond_resched_rcu(); |
6a15a3709 mm, proc: reduce ... |
686 687 688 689 690 691 692 693 694 |
} } rcu_read_unlock(); return swapped << PAGE_SHIFT; } /* |
48131e03c mm, proc: reduce ... |
695 696 697 |
* Determine (in bytes) how many of the shmem object's pages mapped by the * given vma is swapped out. * |
b93b01631 page cache: use x... |
698 |
* This is safe to call without i_mutex or the i_pages lock thanks to RCU, |
48131e03c mm, proc: reduce ... |
699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 |
* as long as the inode doesn't go away and racy results are not a problem. */ unsigned long shmem_swap_usage(struct vm_area_struct *vma) { struct inode *inode = file_inode(vma->vm_file); struct shmem_inode_info *info = SHMEM_I(inode); struct address_space *mapping = inode->i_mapping; unsigned long swapped; /* Be careful as we don't hold info->lock */ swapped = READ_ONCE(info->swapped); /* * The easier cases are when the shmem object has nothing in swap, or * the vma maps it whole. Then we can simply use the stats that we * already track. */ if (!swapped) return 0; if (!vma->vm_pgoff && vma->vm_end - vma->vm_start >= inode->i_size) return swapped << PAGE_SHIFT; /* Here comes the more involved part */ return shmem_partial_swap_usage(mapping, linear_page_index(vma, vma->vm_start), linear_page_index(vma, vma->vm_end)); } /* |
245132643 SHM_UNLOCK: fix U... |
729 730 731 732 733 734 735 |
* SysV IPC SHM_UNLOCK restore Unevictable pages to their evictable lists. */ void shmem_unlock_mapping(struct address_space *mapping) { struct pagevec pvec; pgoff_t indices[PAGEVEC_SIZE]; pgoff_t index = 0; |
866798201 mm, pagevec: remo... |
736 |
pagevec_init(&pvec); |
245132643 SHM_UNLOCK: fix U... |
737 738 739 740 741 742 743 744 |
/* * Minor point, but we might as well stop if someone else SHM_LOCKs it. */ while (!mapping_unevictable(mapping)) { /* * Avoid pagevec_lookup(): find_get_pages() returns 0 as if it * has finished, if it hits a row of PAGEVEC_SIZE swap entries. */ |
0cd6144aa mm + fs: prepare ... |
745 746 |
pvec.nr = find_get_entries(mapping, index, PAGEVEC_SIZE, pvec.pages, indices); |
245132643 SHM_UNLOCK: fix U... |
747 748 749 |
if (!pvec.nr) break; index = indices[pvec.nr - 1] + 1; |
0cd6144aa mm + fs: prepare ... |
750 |
pagevec_remove_exceptionals(&pvec); |
64e3d12f7 mm, drm/i915: mar... |
751 |
check_move_unevictable_pages(&pvec); |
245132643 SHM_UNLOCK: fix U... |
752 753 754 |
pagevec_release(&pvec); cond_resched(); } |
7a5d0fbb2 tmpfs: convert sh... |
755 756 757 |
} /* |
7f4446eef shmem: Comment fi... |
758 |
* Remove range of pages and swap entries from page cache, and free them. |
1635f6a74 tmpfs: undo fallo... |
759 |
* If !unfalloc, truncate or punch hole; if unfalloc, undo failed fallocate. |
7a5d0fbb2 tmpfs: convert sh... |
760 |
*/ |
1635f6a74 tmpfs: undo fallo... |
761 762 |
static void shmem_undo_range(struct inode *inode, loff_t lstart, loff_t lend, bool unfalloc) |
1da177e4c Linux-2.6.12-rc2 |
763 |
{ |
285b2c4fd tmpfs: demolish o... |
764 |
struct address_space *mapping = inode->i_mapping; |
1da177e4c Linux-2.6.12-rc2 |
765 |
struct shmem_inode_info *info = SHMEM_I(inode); |
09cbfeaf1 mm, fs: get rid o... |
766 767 768 769 |
pgoff_t start = (lstart + PAGE_SIZE - 1) >> PAGE_SHIFT; pgoff_t end = (lend + 1) >> PAGE_SHIFT; unsigned int partial_start = lstart & (PAGE_SIZE - 1); unsigned int partial_end = (lend + 1) & (PAGE_SIZE - 1); |
bda97eab0 tmpfs: copy trunc... |
770 |
struct pagevec pvec; |
7a5d0fbb2 tmpfs: convert sh... |
771 772 |
pgoff_t indices[PAGEVEC_SIZE]; long nr_swaps_freed = 0; |
285b2c4fd tmpfs: demolish o... |
773 |
pgoff_t index; |
bda97eab0 tmpfs: copy trunc... |
774 |
int i; |
83e4fa9c1 tmpfs: support fa... |
775 776 |
if (lend == -1) end = -1; /* unsigned, so actually very big */ |
bda97eab0 tmpfs: copy trunc... |
777 |
|
866798201 mm, pagevec: remo... |
778 |
pagevec_init(&pvec); |
bda97eab0 tmpfs: copy trunc... |
779 |
index = start; |
83e4fa9c1 tmpfs: support fa... |
780 |
while (index < end) { |
0cd6144aa mm + fs: prepare ... |
781 782 783 |
pvec.nr = find_get_entries(mapping, index, min(end - index, (pgoff_t)PAGEVEC_SIZE), pvec.pages, indices); |
7a5d0fbb2 tmpfs: convert sh... |
784 785 |
if (!pvec.nr) break; |
bda97eab0 tmpfs: copy trunc... |
786 787 |
for (i = 0; i < pagevec_count(&pvec); i++) { struct page *page = pvec.pages[i]; |
7a5d0fbb2 tmpfs: convert sh... |
788 |
index = indices[i]; |
83e4fa9c1 tmpfs: support fa... |
789 |
if (index >= end) |
bda97eab0 tmpfs: copy trunc... |
790 |
break; |
3159f943a xarray: Replace e... |
791 |
if (xa_is_value(page)) { |
1635f6a74 tmpfs: undo fallo... |
792 793 |
if (unfalloc) continue; |
7a5d0fbb2 tmpfs: convert sh... |
794 795 |
nr_swaps_freed += !shmem_free_swap(mapping, index, page); |
bda97eab0 tmpfs: copy trunc... |
796 |
continue; |
7a5d0fbb2 tmpfs: convert sh... |
797 |
} |
800d8c63b shmem: add huge p... |
798 |
VM_BUG_ON_PAGE(page_to_pgoff(page) != index, page); |
7a5d0fbb2 tmpfs: convert sh... |
799 |
if (!trylock_page(page)) |
bda97eab0 tmpfs: copy trunc... |
800 |
continue; |
800d8c63b shmem: add huge p... |
801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 |
if (PageTransTail(page)) { /* Middle of THP: zero out the page */ clear_highpage(page); unlock_page(page); continue; } else if (PageTransHuge(page)) { if (index == round_down(end, HPAGE_PMD_NR)) { /* * Range ends in the middle of THP: * zero out the page */ clear_highpage(page); unlock_page(page); continue; } index += HPAGE_PMD_NR - 1; i += HPAGE_PMD_NR - 1; } |
1635f6a74 tmpfs: undo fallo... |
820 |
if (!unfalloc || !PageUptodate(page)) { |
800d8c63b shmem: add huge p... |
821 822 |
VM_BUG_ON_PAGE(PageTail(page), page); if (page_mapping(page) == mapping) { |
309381fea mm: dump page whe... |
823 |
VM_BUG_ON_PAGE(PageWriteback(page), page); |
1635f6a74 tmpfs: undo fallo... |
824 825 |
truncate_inode_page(mapping, page); } |
bda97eab0 tmpfs: copy trunc... |
826 |
} |
bda97eab0 tmpfs: copy trunc... |
827 828 |
unlock_page(page); } |
0cd6144aa mm + fs: prepare ... |
829 |
pagevec_remove_exceptionals(&pvec); |
245132643 SHM_UNLOCK: fix U... |
830 |
pagevec_release(&pvec); |
bda97eab0 tmpfs: copy trunc... |
831 832 833 |
cond_resched(); index++; } |
1da177e4c Linux-2.6.12-rc2 |
834 |
|
83e4fa9c1 tmpfs: support fa... |
835 |
if (partial_start) { |
bda97eab0 tmpfs: copy trunc... |
836 |
struct page *page = NULL; |
9e18eb293 tmpfs: mem_cgroup... |
837 |
shmem_getpage(inode, start - 1, &page, SGP_READ); |
bda97eab0 tmpfs: copy trunc... |
838 |
if (page) { |
09cbfeaf1 mm, fs: get rid o... |
839 |
unsigned int top = PAGE_SIZE; |
83e4fa9c1 tmpfs: support fa... |
840 841 842 843 844 845 846 |
if (start > end) { top = partial_end; partial_end = 0; } zero_user_segment(page, partial_start, top); set_page_dirty(page); unlock_page(page); |
09cbfeaf1 mm, fs: get rid o... |
847 |
put_page(page); |
83e4fa9c1 tmpfs: support fa... |
848 849 850 851 |
} } if (partial_end) { struct page *page = NULL; |
9e18eb293 tmpfs: mem_cgroup... |
852 |
shmem_getpage(inode, end, &page, SGP_READ); |
83e4fa9c1 tmpfs: support fa... |
853 854 |
if (page) { zero_user_segment(page, 0, partial_end); |
bda97eab0 tmpfs: copy trunc... |
855 856 |
set_page_dirty(page); unlock_page(page); |
09cbfeaf1 mm, fs: get rid o... |
857 |
put_page(page); |
bda97eab0 tmpfs: copy trunc... |
858 859 |
} } |
83e4fa9c1 tmpfs: support fa... |
860 861 |
if (start >= end) return; |
bda97eab0 tmpfs: copy trunc... |
862 863 |
index = start; |
b1a366500 shmem: fix splici... |
864 |
while (index < end) { |
bda97eab0 tmpfs: copy trunc... |
865 |
cond_resched(); |
0cd6144aa mm + fs: prepare ... |
866 867 |
pvec.nr = find_get_entries(mapping, index, |
83e4fa9c1 tmpfs: support fa... |
868 |
min(end - index, (pgoff_t)PAGEVEC_SIZE), |
0cd6144aa mm + fs: prepare ... |
869 |
pvec.pages, indices); |
7a5d0fbb2 tmpfs: convert sh... |
870 |
if (!pvec.nr) { |
b1a366500 shmem: fix splici... |
871 872 |
/* If all gone or hole-punch or unfalloc, we're done */ if (index == start || end != -1) |
bda97eab0 tmpfs: copy trunc... |
873 |
break; |
b1a366500 shmem: fix splici... |
874 |
/* But if truncating, restart to make sure all gone */ |
bda97eab0 tmpfs: copy trunc... |
875 876 877 |
index = start; continue; } |
bda97eab0 tmpfs: copy trunc... |
878 879 |
for (i = 0; i < pagevec_count(&pvec); i++) { struct page *page = pvec.pages[i]; |
7a5d0fbb2 tmpfs: convert sh... |
880 |
index = indices[i]; |
83e4fa9c1 tmpfs: support fa... |
881 |
if (index >= end) |
bda97eab0 tmpfs: copy trunc... |
882 |
break; |
3159f943a xarray: Replace e... |
883 |
if (xa_is_value(page)) { |
1635f6a74 tmpfs: undo fallo... |
884 885 |
if (unfalloc) continue; |
b1a366500 shmem: fix splici... |
886 887 888 889 890 891 |
if (shmem_free_swap(mapping, index, page)) { /* Swap was replaced by page: retry */ index--; break; } nr_swaps_freed++; |
7a5d0fbb2 tmpfs: convert sh... |
892 893 |
continue; } |
bda97eab0 tmpfs: copy trunc... |
894 |
lock_page(page); |
800d8c63b shmem: add huge p... |
895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 |
if (PageTransTail(page)) { /* Middle of THP: zero out the page */ clear_highpage(page); unlock_page(page); /* * Partial thp truncate due 'start' in middle * of THP: don't need to look on these pages * again on !pvec.nr restart. */ if (index != round_down(end, HPAGE_PMD_NR)) start++; continue; } else if (PageTransHuge(page)) { if (index == round_down(end, HPAGE_PMD_NR)) { /* * Range ends in the middle of THP: * zero out the page */ clear_highpage(page); unlock_page(page); continue; } index += HPAGE_PMD_NR - 1; i += HPAGE_PMD_NR - 1; } |
1635f6a74 tmpfs: undo fallo... |
921 |
if (!unfalloc || !PageUptodate(page)) { |
800d8c63b shmem: add huge p... |
922 923 |
VM_BUG_ON_PAGE(PageTail(page), page); if (page_mapping(page) == mapping) { |
309381fea mm: dump page whe... |
924 |
VM_BUG_ON_PAGE(PageWriteback(page), page); |
1635f6a74 tmpfs: undo fallo... |
925 |
truncate_inode_page(mapping, page); |
b1a366500 shmem: fix splici... |
926 927 928 929 930 |
} else { /* Page was replaced by swap: retry */ unlock_page(page); index--; break; |
1635f6a74 tmpfs: undo fallo... |
931 |
} |
7a5d0fbb2 tmpfs: convert sh... |
932 |
} |
bda97eab0 tmpfs: copy trunc... |
933 934 |
unlock_page(page); } |
0cd6144aa mm + fs: prepare ... |
935 |
pagevec_remove_exceptionals(&pvec); |
245132643 SHM_UNLOCK: fix U... |
936 |
pagevec_release(&pvec); |
bda97eab0 tmpfs: copy trunc... |
937 938 |
index++; } |
94c1e62df tmpfs: take contr... |
939 |
|
4595ef88d shmem: make shmem... |
940 |
spin_lock_irq(&info->lock); |
7a5d0fbb2 tmpfs: convert sh... |
941 |
info->swapped -= nr_swaps_freed; |
1da177e4c Linux-2.6.12-rc2 |
942 |
shmem_recalc_inode(inode); |
4595ef88d shmem: make shmem... |
943 |
spin_unlock_irq(&info->lock); |
1635f6a74 tmpfs: undo fallo... |
944 |
} |
1da177e4c Linux-2.6.12-rc2 |
945 |
|
1635f6a74 tmpfs: undo fallo... |
946 947 948 |
void shmem_truncate_range(struct inode *inode, loff_t lstart, loff_t lend) { shmem_undo_range(inode, lstart, lend, false); |
078cd8279 fs: Replace CURRE... |
949 |
inode->i_ctime = inode->i_mtime = current_time(inode); |
1da177e4c Linux-2.6.12-rc2 |
950 |
} |
94c1e62df tmpfs: take contr... |
951 |
EXPORT_SYMBOL_GPL(shmem_truncate_range); |
1da177e4c Linux-2.6.12-rc2 |
952 |
|
a528d35e8 statx: Add a syst... |
953 954 |
static int shmem_getattr(const struct path *path, struct kstat *stat, u32 request_mask, unsigned int query_flags) |
44a30220b shmem: recalculat... |
955 |
{ |
a528d35e8 statx: Add a syst... |
956 |
struct inode *inode = path->dentry->d_inode; |
44a30220b shmem: recalculat... |
957 |
struct shmem_inode_info *info = SHMEM_I(inode); |
89fdcd262 mm: shmem: make s... |
958 |
struct shmem_sb_info *sb_info = SHMEM_SB(inode->i_sb); |
44a30220b shmem: recalculat... |
959 |
|
d0424c429 tmpfs: avoid a li... |
960 |
if (info->alloced - info->swapped != inode->i_mapping->nrpages) { |
4595ef88d shmem: make shmem... |
961 |
spin_lock_irq(&info->lock); |
d0424c429 tmpfs: avoid a li... |
962 |
shmem_recalc_inode(inode); |
4595ef88d shmem: make shmem... |
963 |
spin_unlock_irq(&info->lock); |
d0424c429 tmpfs: avoid a li... |
964 |
} |
44a30220b shmem: recalculat... |
965 |
generic_fillattr(inode, stat); |
89fdcd262 mm: shmem: make s... |
966 967 968 |
if (is_huge_enabled(sb_info)) stat->blksize = HPAGE_PMD_SIZE; |
44a30220b shmem: recalculat... |
969 970 |
return 0; } |
94c1e62df tmpfs: take contr... |
971 |
static int shmem_setattr(struct dentry *dentry, struct iattr *attr) |
1da177e4c Linux-2.6.12-rc2 |
972 |
{ |
75c3cfa85 VFS: assorted wei... |
973 |
struct inode *inode = d_inode(dentry); |
40e041a2c shm: add sealing API |
974 |
struct shmem_inode_info *info = SHMEM_I(inode); |
779750d20 shmem: split huge... |
975 |
struct shmem_sb_info *sbinfo = SHMEM_SB(inode->i_sb); |
1da177e4c Linux-2.6.12-rc2 |
976 |
int error; |
31051c85b fs: Give dentry t... |
977 |
error = setattr_prepare(dentry, attr); |
db78b877f always call inode... |
978 979 |
if (error) return error; |
94c1e62df tmpfs: take contr... |
980 981 982 |
if (S_ISREG(inode->i_mode) && (attr->ia_valid & ATTR_SIZE)) { loff_t oldsize = inode->i_size; loff_t newsize = attr->ia_size; |
3889e6e76 tmpfs: convert to... |
983 |
|
40e041a2c shm: add sealing API |
984 985 986 987 |
/* protected by i_mutex */ if ((newsize < oldsize && (info->seals & F_SEAL_SHRINK)) || (newsize > oldsize && (info->seals & F_SEAL_GROW))) return -EPERM; |
94c1e62df tmpfs: take contr... |
988 |
if (newsize != oldsize) { |
771425179 shmem: update mem... |
989 990 991 992 |
error = shmem_reacct_size(SHMEM_I(inode)->flags, oldsize, newsize); if (error) return error; |
94c1e62df tmpfs: take contr... |
993 |
i_size_write(inode, newsize); |
078cd8279 fs: Replace CURRE... |
994 |
inode->i_ctime = inode->i_mtime = current_time(inode); |
94c1e62df tmpfs: take contr... |
995 |
} |
afa2db2fb tmpfs: truncate p... |
996 |
if (newsize <= oldsize) { |
94c1e62df tmpfs: take contr... |
997 |
loff_t holebegin = round_up(newsize, PAGE_SIZE); |
d0424c429 tmpfs: avoid a li... |
998 999 1000 1001 1002 1003 |
if (oldsize > holebegin) unmap_mapping_range(inode->i_mapping, holebegin, 0, 1); if (info->alloced) shmem_truncate_range(inode, newsize, (loff_t)-1); |
94c1e62df tmpfs: take contr... |
1004 |
/* unmap again to remove racily COWed private pages */ |
d0424c429 tmpfs: avoid a li... |
1005 1006 1007 |
if (oldsize > holebegin) unmap_mapping_range(inode->i_mapping, holebegin, 0, 1); |
779750d20 shmem: split huge... |
1008 1009 1010 1011 1012 1013 1014 |
/* * Part of the huge page can be beyond i_size: subject * to shrink under memory pressure. */ if (IS_ENABLED(CONFIG_TRANSPARENT_HUGE_PAGECACHE)) { spin_lock(&sbinfo->shrinklist_lock); |
d041353dc mm: fix list corr... |
1015 1016 1017 1018 1019 |
/* * _careful to defend against unlocked access to * ->shrink_list in shmem_unused_huge_shrink() */ if (list_empty_careful(&info->shrinklist)) { |
779750d20 shmem: split huge... |
1020 1021 1022 1023 1024 1025 |
list_add_tail(&info->shrinklist, &sbinfo->shrinklist); sbinfo->shrinklist_len++; } spin_unlock(&sbinfo->shrinklist_lock); } |
94c1e62df tmpfs: take contr... |
1026 |
} |
1da177e4c Linux-2.6.12-rc2 |
1027 |
} |
db78b877f always call inode... |
1028 |
setattr_copy(inode, attr); |
db78b877f always call inode... |
1029 |
if (attr->ia_valid & ATTR_MODE) |
feda821e7 fs: remove generi... |
1030 |
error = posix_acl_chmod(inode, inode->i_mode); |
1da177e4c Linux-2.6.12-rc2 |
1031 1032 |
return error; } |
1f895f75d switch shmem.c to... |
1033 |
static void shmem_evict_inode(struct inode *inode) |
1da177e4c Linux-2.6.12-rc2 |
1034 |
{ |
1da177e4c Linux-2.6.12-rc2 |
1035 |
struct shmem_inode_info *info = SHMEM_I(inode); |
779750d20 shmem: split huge... |
1036 |
struct shmem_sb_info *sbinfo = SHMEM_SB(inode->i_sb); |
1da177e4c Linux-2.6.12-rc2 |
1037 |
|
3889e6e76 tmpfs: convert to... |
1038 |
if (inode->i_mapping->a_ops == &shmem_aops) { |
1da177e4c Linux-2.6.12-rc2 |
1039 1040 |
shmem_unacct_size(info->flags, inode->i_size); inode->i_size = 0; |
3889e6e76 tmpfs: convert to... |
1041 |
shmem_truncate_range(inode, 0, (loff_t)-1); |
779750d20 shmem: split huge... |
1042 1043 1044 1045 1046 1047 1048 1049 |
if (!list_empty(&info->shrinklist)) { spin_lock(&sbinfo->shrinklist_lock); if (!list_empty(&info->shrinklist)) { list_del_init(&info->shrinklist); sbinfo->shrinklist_len--; } spin_unlock(&sbinfo->shrinklist_lock); } |
af53d3e9e mm: swapoff: shme... |
1050 1051 1052 1053 |
while (!list_empty(&info->swaplist)) { /* Wait while shmem_unuse() is scanning this inode... */ wait_var_event(&info->stop_eviction, !atomic_read(&info->stop_eviction)); |
cb5f7b9a4 tmpfs: make shmem... |
1054 |
mutex_lock(&shmem_swaplist_mutex); |
af53d3e9e mm: swapoff: shme... |
1055 1056 1057 |
/* ...but beware of the race if we peeked too early */ if (!atomic_read(&info->stop_eviction)) list_del_init(&info->swaplist); |
cb5f7b9a4 tmpfs: make shmem... |
1058 |
mutex_unlock(&shmem_swaplist_mutex); |
1da177e4c Linux-2.6.12-rc2 |
1059 |
} |
3ed47db34 make sure that fr... |
1060 |
} |
b09e0fa4b tmpfs: implement ... |
1061 |
|
38f386574 xattr: extract si... |
1062 |
simple_xattrs_free(&info->xattrs); |
0f3c42f52 tmpfs: change fin... |
1063 |
WARN_ON(inode->i_blocks); |
5b04c6890 shmem: factor out... |
1064 |
shmem_free_inode(inode->i_sb); |
dbd5768f8 vfs: Rename end_w... |
1065 |
clear_inode(inode); |
1da177e4c Linux-2.6.12-rc2 |
1066 |
} |
b56a2d8af mm: rid swapoff o... |
1067 1068 1069 1070 1071 |
extern struct swap_info_struct *swap_info[]; static int shmem_find_swap_entries(struct address_space *mapping, pgoff_t start, unsigned int nr_entries, struct page **entries, pgoff_t *indices, |
870395465 mm: swapoff: shme... |
1072 |
unsigned int type, bool frontswap) |
478922e2b radix-tree: delet... |
1073 |
{ |
b56a2d8af mm: rid swapoff o... |
1074 1075 |
XA_STATE(xas, &mapping->i_pages, start); struct page *page; |
870395465 mm: swapoff: shme... |
1076 |
swp_entry_t entry; |
b56a2d8af mm: rid swapoff o... |
1077 1078 1079 1080 |
unsigned int ret = 0; if (!nr_entries) return 0; |
478922e2b radix-tree: delet... |
1081 1082 |
rcu_read_lock(); |
b56a2d8af mm: rid swapoff o... |
1083 1084 |
xas_for_each(&xas, page, ULONG_MAX) { if (xas_retry(&xas, page)) |
5b9c98f30 mm/shmem: add __r... |
1085 |
continue; |
b56a2d8af mm: rid swapoff o... |
1086 1087 |
if (!xa_is_value(page)) |
478922e2b radix-tree: delet... |
1088 |
continue; |
b56a2d8af mm: rid swapoff o... |
1089 |
|
870395465 mm: swapoff: shme... |
1090 1091 1092 1093 1094 1095 |
entry = radix_to_swp_entry(page); if (swp_type(entry) != type) continue; if (frontswap && !frontswap_test(swap_info[type], swp_offset(entry))) continue; |
b56a2d8af mm: rid swapoff o... |
1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 |
indices[ret] = xas.xa_index; entries[ret] = page; if (need_resched()) { xas_pause(&xas); cond_resched_rcu(); } if (++ret == nr_entries) break; |
478922e2b radix-tree: delet... |
1106 |
} |
478922e2b radix-tree: delet... |
1107 |
rcu_read_unlock(); |
e21a29552 shmem: Convert fi... |
1108 |
|
b56a2d8af mm: rid swapoff o... |
1109 |
return ret; |
478922e2b radix-tree: delet... |
1110 |
} |
46f65ec15 tmpfs: convert sh... |
1111 |
/* |
b56a2d8af mm: rid swapoff o... |
1112 1113 |
* Move the swapped pages for an inode to page cache. Returns the count * of pages swapped in, or the error in case of failure. |
46f65ec15 tmpfs: convert sh... |
1114 |
*/ |
b56a2d8af mm: rid swapoff o... |
1115 1116 |
static int shmem_unuse_swap_entries(struct inode *inode, struct pagevec pvec, pgoff_t *indices) |
1da177e4c Linux-2.6.12-rc2 |
1117 |
{ |
b56a2d8af mm: rid swapoff o... |
1118 1119 |
int i = 0; int ret = 0; |
bde05d1cc shmem: replace pa... |
1120 |
int error = 0; |
b56a2d8af mm: rid swapoff o... |
1121 |
struct address_space *mapping = inode->i_mapping; |
1da177e4c Linux-2.6.12-rc2 |
1122 |
|
b56a2d8af mm: rid swapoff o... |
1123 1124 |
for (i = 0; i < pvec.nr; i++) { struct page *page = pvec.pages[i]; |
2e0e26c76 tmpfs: open a win... |
1125 |
|
b56a2d8af mm: rid swapoff o... |
1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 |
if (!xa_is_value(page)) continue; error = shmem_swapin_page(inode, indices[i], &page, SGP_CACHE, mapping_gfp_mask(mapping), NULL, NULL); if (error == 0) { unlock_page(page); put_page(page); ret++; } if (error == -ENOMEM) break; error = 0; |
bde05d1cc shmem: replace pa... |
1140 |
} |
b56a2d8af mm: rid swapoff o... |
1141 1142 |
return error ? error : ret; } |
bde05d1cc shmem: replace pa... |
1143 |
|
b56a2d8af mm: rid swapoff o... |
1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 |
/* * If swap found in inode, free it and move page from swapcache to filecache. */ static int shmem_unuse_inode(struct inode *inode, unsigned int type, bool frontswap, unsigned long *fs_pages_to_unuse) { struct address_space *mapping = inode->i_mapping; pgoff_t start = 0; struct pagevec pvec; pgoff_t indices[PAGEVEC_SIZE]; bool frontswap_partial = (frontswap && *fs_pages_to_unuse > 0); int ret = 0; pagevec_init(&pvec); do { unsigned int nr_entries = PAGEVEC_SIZE; if (frontswap_partial && *fs_pages_to_unuse < PAGEVEC_SIZE) nr_entries = *fs_pages_to_unuse; pvec.nr = shmem_find_swap_entries(mapping, start, nr_entries, pvec.pages, indices, |
870395465 mm: swapoff: shme... |
1166 |
type, frontswap); |
b56a2d8af mm: rid swapoff o... |
1167 1168 1169 |
if (pvec.nr == 0) { ret = 0; break; |
46f65ec15 tmpfs: convert sh... |
1170 |
} |
b56a2d8af mm: rid swapoff o... |
1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 |
ret = shmem_unuse_swap_entries(inode, pvec, indices); if (ret < 0) break; if (frontswap_partial) { *fs_pages_to_unuse -= ret; if (*fs_pages_to_unuse == 0) { ret = FRONTSWAP_PAGES_UNUSED; break; } } start = indices[pvec.nr - 1]; } while (true); return ret; |
1da177e4c Linux-2.6.12-rc2 |
1188 1189 1190 |
} /* |
b56a2d8af mm: rid swapoff o... |
1191 1192 1193 |
* Read all the shared memory data that resides in the swap * device 'type' back into memory, so the swap device can be * unused. |
1da177e4c Linux-2.6.12-rc2 |
1194 |
*/ |
b56a2d8af mm: rid swapoff o... |
1195 1196 |
int shmem_unuse(unsigned int type, bool frontswap, unsigned long *fs_pages_to_unuse) |
1da177e4c Linux-2.6.12-rc2 |
1197 |
{ |
b56a2d8af mm: rid swapoff o... |
1198 |
struct shmem_inode_info *info, *next; |
bde05d1cc shmem: replace pa... |
1199 |
int error = 0; |
b56a2d8af mm: rid swapoff o... |
1200 1201 1202 1203 |
if (list_empty(&shmem_swaplist)) return 0; mutex_lock(&shmem_swaplist_mutex); |
b56a2d8af mm: rid swapoff o... |
1204 1205 |
list_for_each_entry_safe(info, next, &shmem_swaplist, swaplist) { if (!info->swapped) { |
6922c0c7a tmpfs: convert sh... |
1206 |
list_del_init(&info->swaplist); |
b56a2d8af mm: rid swapoff o... |
1207 1208 |
continue; } |
af53d3e9e mm: swapoff: shme... |
1209 1210 1211 1212 1213 1214 1215 |
/* * Drop the swaplist mutex while searching the inode for swap; * but before doing so, make sure shmem_evict_inode() will not * remove placeholder inode from swaplist, nor let it be freed * (igrab() would protect from unlink, but not from unmount). */ atomic_inc(&info->stop_eviction); |
b56a2d8af mm: rid swapoff o... |
1216 |
mutex_unlock(&shmem_swaplist_mutex); |
b56a2d8af mm: rid swapoff o... |
1217 |
|
af53d3e9e mm: swapoff: shme... |
1218 |
error = shmem_unuse_inode(&info->vfs_inode, type, frontswap, |
b56a2d8af mm: rid swapoff o... |
1219 |
fs_pages_to_unuse); |
cb5f7b9a4 tmpfs: make shmem... |
1220 |
cond_resched(); |
b56a2d8af mm: rid swapoff o... |
1221 1222 1223 1224 1225 |
mutex_lock(&shmem_swaplist_mutex); next = list_next_entry(info, swaplist); if (!info->swapped) list_del_init(&info->swaplist); |
af53d3e9e mm: swapoff: shme... |
1226 1227 |
if (atomic_dec_and_test(&info->stop_eviction)) wake_up_var(&info->stop_eviction); |
b56a2d8af mm: rid swapoff o... |
1228 |
if (error) |
778dd893a tmpfs: fix race b... |
1229 |
break; |
1da177e4c Linux-2.6.12-rc2 |
1230 |
} |
cb5f7b9a4 tmpfs: make shmem... |
1231 |
mutex_unlock(&shmem_swaplist_mutex); |
778dd893a tmpfs: fix race b... |
1232 |
|
778dd893a tmpfs: fix race b... |
1233 |
return error; |
1da177e4c Linux-2.6.12-rc2 |
1234 1235 1236 1237 1238 1239 1240 1241 |
} /* * 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 |
1242 |
struct address_space *mapping; |
1da177e4c Linux-2.6.12-rc2 |
1243 |
struct inode *inode; |
6922c0c7a tmpfs: convert sh... |
1244 1245 |
swp_entry_t swap; pgoff_t index; |
1da177e4c Linux-2.6.12-rc2 |
1246 |
|
800d8c63b shmem: add huge p... |
1247 |
VM_BUG_ON_PAGE(PageCompound(page), page); |
1da177e4c Linux-2.6.12-rc2 |
1248 |
BUG_ON(!PageLocked(page)); |
1da177e4c Linux-2.6.12-rc2 |
1249 1250 1251 1252 1253 1254 |
mapping = page->mapping; index = page->index; inode = mapping->host; info = SHMEM_I(inode); if (info->flags & VM_LOCKED) goto redirty; |
d9fe526a8 tmpfs: allow file... |
1255 |
if (!total_swap_pages) |
1da177e4c Linux-2.6.12-rc2 |
1256 |
goto redirty; |
d9fe526a8 tmpfs: allow file... |
1257 |
/* |
97b713ba3 fs: kill BDI_CAP_... |
1258 1259 1260 1261 1262 |
* Our capabilities prevent regular writeback or sync from ever calling * shmem_writepage; but a stacking filesystem might use ->writepage of * its underlying filesystem, in which case tmpfs should write out to * swap only in response to memory pressure, and not for the writeback * threads or sync. |
d9fe526a8 tmpfs: allow file... |
1263 |
*/ |
48f170fb7 tmpfs: simplify u... |
1264 1265 1266 1267 |
if (!wbc->for_reclaim) { WARN_ON_ONCE(1); /* Still happens? Tell us about it! */ goto redirty; } |
1635f6a74 tmpfs: undo fallo... |
1268 1269 1270 1271 1272 |
/* * This is somewhat ridiculous, but without plumbing a SWAP_MAP_FALLOC * value into swapfile.c, the only way we can correctly account for a * fallocated page arriving here is now to initialize it and write it. |
1aac14003 tmpfs: quit when ... |
1273 1274 1275 1276 1277 1278 |
* * That's okay for a page already fallocated earlier, but if we have * not yet completed the fallocation, then (a) we want to keep track * of this page in case we have to undo it, and (b) it may not be a * good idea to continue anyway, once we're pushing into swap. So * reactivate the page, and let shmem_fallocate() quit when too many. |
1635f6a74 tmpfs: undo fallo... |
1279 1280 |
*/ if (!PageUptodate(page)) { |
1aac14003 tmpfs: quit when ... |
1281 1282 1283 1284 1285 |
if (inode->i_private) { struct shmem_falloc *shmem_falloc; spin_lock(&inode->i_lock); shmem_falloc = inode->i_private; if (shmem_falloc && |
8e205f779 shmem: fix faulti... |
1286 |
!shmem_falloc->waitq && |
1aac14003 tmpfs: quit when ... |
1287 1288 1289 1290 1291 1292 1293 1294 1295 |
index >= shmem_falloc->start && index < shmem_falloc->next) shmem_falloc->nr_unswapped++; else shmem_falloc = NULL; spin_unlock(&inode->i_lock); if (shmem_falloc) goto redirty; } |
1635f6a74 tmpfs: undo fallo... |
1296 1297 1298 1299 |
clear_highpage(page); flush_dcache_page(page); SetPageUptodate(page); } |
38d8b4e6b mm, THP, swap: de... |
1300 |
swap = get_swap_page(page); |
48f170fb7 tmpfs: simplify u... |
1301 1302 |
if (!swap.val) goto redirty; |
d9fe526a8 tmpfs: allow file... |
1303 |
|
b1dea800a tmpfs: fix race b... |
1304 1305 |
/* * Add inode to shmem_unuse()'s list of swapped-out inodes, |
6922c0c7a tmpfs: convert sh... |
1306 1307 |
* 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... |
1308 |
* the inode from eviction. But don't unlock the mutex until |
6922c0c7a tmpfs: convert sh... |
1309 1310 |
* we've incremented swapped, because shmem_unuse_inode() will * prune a !swapped inode from the swaplist under this mutex. |
b1dea800a tmpfs: fix race b... |
1311 |
*/ |
48f170fb7 tmpfs: simplify u... |
1312 1313 |
mutex_lock(&shmem_swaplist_mutex); if (list_empty(&info->swaplist)) |
b56a2d8af mm: rid swapoff o... |
1314 |
list_add(&info->swaplist, &shmem_swaplist); |
b1dea800a tmpfs: fix race b... |
1315 |
|
48f170fb7 tmpfs: simplify u... |
1316 |
if (add_to_swap_cache(page, swap, GFP_ATOMIC) == 0) { |
4595ef88d shmem: make shmem... |
1317 |
spin_lock_irq(&info->lock); |
6922c0c7a tmpfs: convert sh... |
1318 |
shmem_recalc_inode(inode); |
267a4c76b tmpfs: fix shmem_... |
1319 |
info->swapped++; |
4595ef88d shmem: make shmem... |
1320 |
spin_unlock_irq(&info->lock); |
6922c0c7a tmpfs: convert sh... |
1321 |
|
267a4c76b tmpfs: fix shmem_... |
1322 1323 |
swap_shmem_alloc(swap); shmem_delete_from_page_cache(page, swp_to_radix_entry(swap)); |
6922c0c7a tmpfs: convert sh... |
1324 |
mutex_unlock(&shmem_swaplist_mutex); |
d9fe526a8 tmpfs: allow file... |
1325 |
BUG_ON(page_mapped(page)); |
9fab5619b shmem: writepage ... |
1326 |
swap_writepage(page, wbc); |
1da177e4c Linux-2.6.12-rc2 |
1327 1328 |
return 0; } |
6922c0c7a tmpfs: convert sh... |
1329 |
mutex_unlock(&shmem_swaplist_mutex); |
75f6d6d29 mm, THP, swap: un... |
1330 |
put_swap_page(page, swap); |
1da177e4c Linux-2.6.12-rc2 |
1331 1332 |
redirty: set_page_dirty(page); |
d9fe526a8 tmpfs: allow file... |
1333 1334 1335 1336 |
if (wbc->for_reclaim) return AOP_WRITEPAGE_ACTIVATE; /* Return with page locked */ unlock_page(page); return 0; |
1da177e4c Linux-2.6.12-rc2 |
1337 |
} |
75edd345e tmpfs: preliminar... |
1338 |
#if defined(CONFIG_NUMA) && defined(CONFIG_TMPFS) |
71fe804b6 mempolicy: use st... |
1339 |
static void shmem_show_mpol(struct seq_file *seq, struct mempolicy *mpol) |
680d794ba mount options: fi... |
1340 |
{ |
095f1fc4e mempolicy: rework... |
1341 |
char buffer[64]; |
680d794ba mount options: fi... |
1342 |
|
71fe804b6 mempolicy: use st... |
1343 |
if (!mpol || mpol->mode == MPOL_DEFAULT) |
095f1fc4e mempolicy: rework... |
1344 |
return; /* show nothing */ |
680d794ba mount options: fi... |
1345 |
|
a7a88b237 mempolicy: remove... |
1346 |
mpol_to_str(buffer, sizeof(buffer), mpol); |
095f1fc4e mempolicy: rework... |
1347 1348 |
seq_printf(seq, ",mpol=%s", buffer); |
680d794ba mount options: fi... |
1349 |
} |
71fe804b6 mempolicy: use st... |
1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 |
static struct mempolicy *shmem_get_sbmpol(struct shmem_sb_info *sbinfo) { struct mempolicy *mpol = NULL; if (sbinfo->mpol) { spin_lock(&sbinfo->stat_lock); /* prevent replace/use races */ mpol = sbinfo->mpol; mpol_get(mpol); spin_unlock(&sbinfo->stat_lock); } return mpol; } |
75edd345e tmpfs: preliminar... |
1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 |
#else /* !CONFIG_NUMA || !CONFIG_TMPFS */ static inline void shmem_show_mpol(struct seq_file *seq, struct mempolicy *mpol) { } static inline struct mempolicy *shmem_get_sbmpol(struct shmem_sb_info *sbinfo) { return NULL; } #endif /* CONFIG_NUMA && CONFIG_TMPFS */ #ifndef CONFIG_NUMA #define vm_policy vm_private_data #endif |
680d794ba mount options: fi... |
1374 |
|
800d8c63b shmem: add huge p... |
1375 1376 1377 1378 |
static void shmem_pseudo_vma_init(struct vm_area_struct *vma, struct shmem_inode_info *info, pgoff_t index) { /* Create a pseudo vma that just contains the policy */ |
2c4541e24 mm: use vma_init(... |
1379 |
vma_init(vma, NULL); |
800d8c63b shmem: add huge p... |
1380 1381 |
/* Bias interleave by inode number to distribute better across nodes */ vma->vm_pgoff = index + info->vfs_inode.i_ino; |
800d8c63b shmem: add huge p... |
1382 1383 1384 1385 1386 1387 1388 1389 |
vma->vm_policy = mpol_shared_policy_lookup(&info->policy, index); } static void shmem_pseudo_vma_destroy(struct vm_area_struct *vma) { /* Drop reference taken by mpol_shared_policy_lookup() */ mpol_cond_put(vma->vm_policy); } |
41ffe5d5c tmpfs: miscellane... |
1390 1391 |
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 |
1392 |
{ |
1da177e4c Linux-2.6.12-rc2 |
1393 |
struct vm_area_struct pvma; |
18a2f371f tmpfs: fix shared... |
1394 |
struct page *page; |
e9e9b7ece mm: swap: unify c... |
1395 |
struct vm_fault vmf; |
52cd3b074 mempolicy: rework... |
1396 |
|
800d8c63b shmem: add huge p... |
1397 |
shmem_pseudo_vma_init(&pvma, info, index); |
e9e9b7ece mm: swap: unify c... |
1398 1399 1400 |
vmf.vma = &pvma; vmf.address = 0; page = swap_cluster_readahead(swap, gfp, &vmf); |
800d8c63b shmem: add huge p... |
1401 |
shmem_pseudo_vma_destroy(&pvma); |
18a2f371f tmpfs: fix shared... |
1402 |
|
800d8c63b shmem: add huge p... |
1403 1404 1405 1406 1407 1408 1409 |
return page; } static struct page *shmem_alloc_hugepage(gfp_t gfp, struct shmem_inode_info *info, pgoff_t index) { struct vm_area_struct pvma; |
7b8d046fb shmem: Convert sh... |
1410 1411 |
struct address_space *mapping = info->vfs_inode.i_mapping; pgoff_t hindex; |
800d8c63b shmem: add huge p... |
1412 |
struct page *page; |
e496cf3d7 thp: introduce CO... |
1413 |
if (!IS_ENABLED(CONFIG_TRANSPARENT_HUGE_PAGECACHE)) |
800d8c63b shmem: add huge p... |
1414 |
return NULL; |
4620a06e4 shmem: Fix link e... |
1415 |
hindex = round_down(index, HPAGE_PMD_NR); |
7b8d046fb shmem: Convert sh... |
1416 1417 |
if (xa_find(&mapping->i_pages, &hindex, hindex + HPAGE_PMD_NR - 1, XA_PRESENT)) |
800d8c63b shmem: add huge p... |
1418 |
return NULL; |
18a2f371f tmpfs: fix shared... |
1419 |
|
800d8c63b shmem: add huge p... |
1420 1421 |
shmem_pseudo_vma_init(&pvma, info, hindex); page = alloc_pages_vma(gfp | __GFP_COMP | __GFP_NORETRY | __GFP_NOWARN, |
19deb7695 Revert "Revert "R... |
1422 |
HPAGE_PMD_ORDER, &pvma, 0, numa_node_id(), true); |
800d8c63b shmem: add huge p... |
1423 1424 1425 |
shmem_pseudo_vma_destroy(&pvma); if (page) prep_transhuge_page(page); |
18a2f371f tmpfs: fix shared... |
1426 |
return page; |
1da177e4c Linux-2.6.12-rc2 |
1427 |
} |
02098feaa swapin needs gfp_... |
1428 |
static struct page *shmem_alloc_page(gfp_t gfp, |
41ffe5d5c tmpfs: miscellane... |
1429 |
struct shmem_inode_info *info, pgoff_t index) |
1da177e4c Linux-2.6.12-rc2 |
1430 1431 |
{ struct vm_area_struct pvma; |
18a2f371f tmpfs: fix shared... |
1432 |
struct page *page; |
1da177e4c Linux-2.6.12-rc2 |
1433 |
|
800d8c63b shmem: add huge p... |
1434 1435 1436 1437 1438 1439 1440 1441 |
shmem_pseudo_vma_init(&pvma, info, index); page = alloc_page_vma(gfp, &pvma, 0); shmem_pseudo_vma_destroy(&pvma); return page; } static struct page *shmem_alloc_and_acct_page(gfp_t gfp, |
0f0796945 shmem: introduce ... |
1442 |
struct inode *inode, |
800d8c63b shmem: add huge p... |
1443 1444 |
pgoff_t index, bool huge) { |
0f0796945 shmem: introduce ... |
1445 |
struct shmem_inode_info *info = SHMEM_I(inode); |
800d8c63b shmem: add huge p... |
1446 1447 1448 |
struct page *page; int nr; int err = -ENOSPC; |
52cd3b074 mempolicy: rework... |
1449 |
|
e496cf3d7 thp: introduce CO... |
1450 |
if (!IS_ENABLED(CONFIG_TRANSPARENT_HUGE_PAGECACHE)) |
800d8c63b shmem: add huge p... |
1451 1452 |
huge = false; nr = huge ? HPAGE_PMD_NR : 1; |
0f0796945 shmem: introduce ... |
1453 |
if (!shmem_inode_acct_block(inode, nr)) |
800d8c63b shmem: add huge p... |
1454 |
goto failed; |
800d8c63b shmem: add huge p... |
1455 1456 1457 1458 1459 |
if (huge) page = shmem_alloc_hugepage(gfp, info, index); else page = shmem_alloc_page(gfp, info, index); |
75edd345e tmpfs: preliminar... |
1460 1461 1462 |
if (page) { __SetPageLocked(page); __SetPageSwapBacked(page); |
800d8c63b shmem: add huge p... |
1463 |
return page; |
75edd345e tmpfs: preliminar... |
1464 |
} |
18a2f371f tmpfs: fix shared... |
1465 |
|
800d8c63b shmem: add huge p... |
1466 |
err = -ENOMEM; |
0f0796945 shmem: introduce ... |
1467 |
shmem_inode_unacct_blocks(inode, nr); |
800d8c63b shmem: add huge p... |
1468 1469 |
failed: return ERR_PTR(err); |
1da177e4c Linux-2.6.12-rc2 |
1470 |
} |
71fe804b6 mempolicy: use st... |
1471 |
|
1da177e4c Linux-2.6.12-rc2 |
1472 |
/* |
bde05d1cc shmem: replace pa... |
1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 |
* When a page is moved from swapcache to shmem filecache (either by the * usual swapin of shmem_getpage_gfp(), or by the less common swapoff of * shmem_unuse_inode()), it may have been read in earlier from swap, in * ignorance of the mapping it belongs to. If that mapping has special * constraints (like the gma500 GEM driver, which requires RAM below 4GB), * we may need to copy to a suitable page before moving to filecache. * * In a future release, this may well be extended to respect cpuset and * NUMA mempolicy, and applied also to anonymous pages in do_swap_page(); * but for now it is a simple matter of zone. */ static bool shmem_should_replace_page(struct page *page, gfp_t gfp) { return page_zonenum(page) > gfp_zone(gfp); } static int shmem_replace_page(struct page **pagep, gfp_t gfp, struct shmem_inode_info *info, pgoff_t index) { struct page *oldpage, *newpage; struct address_space *swap_mapping; |
c1cb20d43 mm: use swp_offse... |
1494 |
swp_entry_t entry; |
bde05d1cc shmem: replace pa... |
1495 1496 1497 1498 |
pgoff_t swap_index; int error; oldpage = *pagep; |
c1cb20d43 mm: use swp_offse... |
1499 1500 |
entry.val = page_private(oldpage); swap_index = swp_offset(entry); |
bde05d1cc shmem: replace pa... |
1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 |
swap_mapping = page_mapping(oldpage); /* * We have arrived here because our zones are constrained, so don't * limit chance of success by further cpuset and node constraints. */ gfp &= ~GFP_CONSTRAINT_MASK; newpage = shmem_alloc_page(gfp, info, index); if (!newpage) return -ENOMEM; |
bde05d1cc shmem: replace pa... |
1511 |
|
09cbfeaf1 mm, fs: get rid o... |
1512 |
get_page(newpage); |
bde05d1cc shmem: replace pa... |
1513 |
copy_highpage(newpage, oldpage); |
0142ef6cd shmem: replace_pa... |
1514 |
flush_dcache_page(newpage); |
bde05d1cc shmem: replace pa... |
1515 |
|
9956edf37 shmem: fix pagefl... |
1516 1517 |
__SetPageLocked(newpage); __SetPageSwapBacked(newpage); |
bde05d1cc shmem: replace pa... |
1518 |
SetPageUptodate(newpage); |
c1cb20d43 mm: use swp_offse... |
1519 |
set_page_private(newpage, entry.val); |
bde05d1cc shmem: replace pa... |
1520 1521 1522 1523 1524 1525 |
SetPageSwapCache(newpage); /* * Our caller will very soon move newpage out of swapcache, but it's * a nice clean interface for us to replace oldpage by newpage there. */ |
b93b01631 page cache: use x... |
1526 |
xa_lock_irq(&swap_mapping->i_pages); |
62f945b6a shmem: Convert sh... |
1527 |
error = shmem_replace_entry(swap_mapping, swap_index, oldpage, newpage); |
0142ef6cd shmem: replace_pa... |
1528 |
if (!error) { |
11fb99898 mm: move most fil... |
1529 1530 |
__inc_node_page_state(newpage, NR_FILE_PAGES); __dec_node_page_state(oldpage, NR_FILE_PAGES); |
0142ef6cd shmem: replace_pa... |
1531 |
} |
b93b01631 page cache: use x... |
1532 |
xa_unlock_irq(&swap_mapping->i_pages); |
bde05d1cc shmem: replace pa... |
1533 |
|
0142ef6cd shmem: replace_pa... |
1534 1535 1536 1537 1538 1539 1540 1541 |
if (unlikely(error)) { /* * Is this possible? I think not, now that our callers check * both PageSwapCache and page_private after getting page lock; * but be defensive. Reverse old to newpage for clear and free. */ oldpage = newpage; } else { |
6a93ca8fd mm: migrate: do n... |
1542 |
mem_cgroup_migrate(oldpage, newpage); |
0142ef6cd shmem: replace_pa... |
1543 1544 1545 |
lru_cache_add_anon(newpage); *pagep = newpage; } |
bde05d1cc shmem: replace pa... |
1546 1547 1548 1549 1550 |
ClearPageSwapCache(oldpage); set_page_private(oldpage, 0); unlock_page(oldpage); |
09cbfeaf1 mm, fs: get rid o... |
1551 1552 |
put_page(oldpage); put_page(oldpage); |
0142ef6cd shmem: replace_pa... |
1553 |
return error; |
bde05d1cc shmem: replace pa... |
1554 1555 1556 |
} /* |
c5bf121e4 mm: refactor swap... |
1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 |
* Swap in the page pointed to by *pagep. * Caller has to make sure that *pagep contains a valid swapped page. * Returns 0 and the page in pagep if success. On failure, returns the * the error code and NULL in *pagep. */ static int shmem_swapin_page(struct inode *inode, pgoff_t index, struct page **pagep, enum sgp_type sgp, gfp_t gfp, struct vm_area_struct *vma, vm_fault_t *fault_type) { struct address_space *mapping = inode->i_mapping; struct shmem_inode_info *info = SHMEM_I(inode); struct mm_struct *charge_mm = vma ? vma->vm_mm : current->mm; struct mem_cgroup *memcg; struct page *page; swp_entry_t swap; int error; VM_BUG_ON(!*pagep || !xa_is_value(*pagep)); swap = radix_to_swp_entry(*pagep); *pagep = NULL; /* Look it up and read it in.. */ page = lookup_swap_cache(swap, NULL, 0); if (!page) { /* Or update major stats only when swapin succeeds?? */ if (fault_type) { *fault_type |= VM_FAULT_MAJOR; count_vm_event(PGMAJFAULT); count_memcg_event_mm(charge_mm, PGMAJFAULT); } /* Here we actually start the io */ page = shmem_swapin(swap, gfp, info, index); if (!page) { error = -ENOMEM; goto failed; } } /* We have to do this with page locked to prevent races */ lock_page(page); if (!PageSwapCache(page) || page_private(page) != swap.val || !shmem_confirm_swap(mapping, index, swap)) { error = -EEXIST; goto unlock; } if (!PageUptodate(page)) { error = -EIO; goto failed; } wait_on_page_writeback(page); if (shmem_should_replace_page(page, gfp)) { error = shmem_replace_page(&page, gfp, info, index); if (error) goto failed; } error = mem_cgroup_try_charge_delay(page, charge_mm, gfp, &memcg, false); if (!error) { error = shmem_add_to_page_cache(page, mapping, index, swp_to_radix_entry(swap), gfp); /* * We already confirmed swap under page lock, and make * no memory allocation here, so usually no possibility * of error; but free_swap_and_cache() only trylocks a * page, so it is just possible that the entry has been * truncated or holepunched since swap was confirmed. * shmem_undo_range() will have done some of the * unaccounting, now delete_from_swap_cache() will do * the rest. */ if (error) { mem_cgroup_cancel_charge(page, memcg, false); delete_from_swap_cache(page); } } if (error) goto failed; mem_cgroup_commit_charge(page, memcg, true, false); spin_lock_irq(&info->lock); info->swapped--; shmem_recalc_inode(inode); spin_unlock_irq(&info->lock); if (sgp == SGP_WRITE) mark_page_accessed(page); delete_from_swap_cache(page); set_page_dirty(page); swap_free(swap); *pagep = page; return 0; failed: if (!shmem_confirm_swap(mapping, index, swap)) error = -EEXIST; unlock: if (page) { unlock_page(page); put_page(page); } return error; } /* |
68da9f055 tmpfs: pass gfp t... |
1667 |
* shmem_getpage_gfp - find page in cache, or get from swap, or allocate |
1da177e4c Linux-2.6.12-rc2 |
1668 1669 1670 |
* * If we allocate a new one we do not mark it dirty. That's up to the * vm. If we swap it in we mark it dirty since we also free the swap |
9e18eb293 tmpfs: mem_cgroup... |
1671 1672 |
* entry since a page cannot live in both the swap and page cache. * |
28eb3c808 shmem: fix obsole... |
1673 |
* vmf and fault_type are only supplied by shmem_fault: |
9e18eb293 tmpfs: mem_cgroup... |
1674 |
* otherwise they are NULL. |
1da177e4c Linux-2.6.12-rc2 |
1675 |
*/ |
41ffe5d5c tmpfs: miscellane... |
1676 |
static int shmem_getpage_gfp(struct inode *inode, pgoff_t index, |
9e18eb293 tmpfs: mem_cgroup... |
1677 |
struct page **pagep, enum sgp_type sgp, gfp_t gfp, |
2b7403035 mm: Change return... |
1678 1679 |
struct vm_area_struct *vma, struct vm_fault *vmf, vm_fault_t *fault_type) |
1da177e4c Linux-2.6.12-rc2 |
1680 1681 |
{ struct address_space *mapping = inode->i_mapping; |
23f919d4a shmem: avoid mayb... |
1682 |
struct shmem_inode_info *info = SHMEM_I(inode); |
1da177e4c Linux-2.6.12-rc2 |
1683 |
struct shmem_sb_info *sbinfo; |
9e18eb293 tmpfs: mem_cgroup... |
1684 |
struct mm_struct *charge_mm; |
00501b531 mm: memcontrol: r... |
1685 |
struct mem_cgroup *memcg; |
27ab70062 tmpfs: simplify f... |
1686 |
struct page *page; |
657e3038c shmem, thp: respe... |
1687 |
enum sgp_type sgp_huge = sgp; |
800d8c63b shmem: add huge p... |
1688 |
pgoff_t hindex = index; |
1da177e4c Linux-2.6.12-rc2 |
1689 |
int error; |
54af60421 tmpfs: convert sh... |
1690 |
int once = 0; |
1635f6a74 tmpfs: undo fallo... |
1691 |
int alloced = 0; |
1da177e4c Linux-2.6.12-rc2 |
1692 |
|
09cbfeaf1 mm, fs: get rid o... |
1693 |
if (index > (MAX_LFS_FILESIZE >> PAGE_SHIFT)) |
1da177e4c Linux-2.6.12-rc2 |
1694 |
return -EFBIG; |
657e3038c shmem, thp: respe... |
1695 1696 |
if (sgp == SGP_NOHUGE || sgp == SGP_HUGE) sgp = SGP_CACHE; |
1da177e4c Linux-2.6.12-rc2 |
1697 |
repeat: |
c5bf121e4 mm: refactor swap... |
1698 1699 1700 1701 1702 1703 1704 |
if (sgp <= SGP_CACHE && ((loff_t)index << PAGE_SHIFT) >= i_size_read(inode)) { return -EINVAL; } sbinfo = SHMEM_SB(inode->i_sb); charge_mm = vma ? vma->vm_mm : current->mm; |
0cd6144aa mm + fs: prepare ... |
1705 |
page = find_lock_entry(mapping, index); |
3159f943a xarray: Replace e... |
1706 |
if (xa_is_value(page)) { |
c5bf121e4 mm: refactor swap... |
1707 1708 1709 1710 |
error = shmem_swapin_page(inode, index, &page, sgp, gfp, vma, fault_type); if (error == -EEXIST) goto repeat; |
54af60421 tmpfs: convert sh... |
1711 |
|
c5bf121e4 mm: refactor swap... |
1712 1713 |
*pagep = page; return error; |
54af60421 tmpfs: convert sh... |
1714 |
} |
66d2f4d28 shmem: fix init_p... |
1715 1716 |
if (page && sgp == SGP_WRITE) mark_page_accessed(page); |
1635f6a74 tmpfs: undo fallo... |
1717 1718 1719 1720 1721 |
/* fallocated page? */ if (page && !PageUptodate(page)) { if (sgp != SGP_READ) goto clear; unlock_page(page); |
09cbfeaf1 mm, fs: get rid o... |
1722 |
put_page(page); |
1635f6a74 tmpfs: undo fallo... |
1723 1724 |
page = NULL; } |
c5bf121e4 mm: refactor swap... |
1725 |
if (page || sgp == SGP_READ) { |
54af60421 tmpfs: convert sh... |
1726 1727 |
*pagep = page; return 0; |
27ab70062 tmpfs: simplify f... |
1728 1729 1730 |
} /* |
54af60421 tmpfs: convert sh... |
1731 1732 |
* Fast cache lookup did not find it: * bring it back from swap or allocate. |
27ab70062 tmpfs: simplify f... |
1733 |
*/ |
54af60421 tmpfs: convert sh... |
1734 |
|
c5bf121e4 mm: refactor swap... |
1735 1736 1737 1738 |
if (vma && userfaultfd_missing(vma)) { *fault_type = handle_userfault(vmf, VM_UFFD_MISSING); return 0; } |
cfda05267 userfaultfd: shme... |
1739 |
|
c5bf121e4 mm: refactor swap... |
1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 |
/* shmem_symlink() */ if (mapping->a_ops != &shmem_aops) goto alloc_nohuge; if (shmem_huge == SHMEM_HUGE_DENY || sgp_huge == SGP_NOHUGE) goto alloc_nohuge; if (shmem_huge == SHMEM_HUGE_FORCE) goto alloc_huge; switch (sbinfo->huge) { loff_t i_size; pgoff_t off; case SHMEM_HUGE_NEVER: goto alloc_nohuge; case SHMEM_HUGE_WITHIN_SIZE: off = round_up(index, HPAGE_PMD_NR); i_size = round_up(i_size_read(inode), PAGE_SIZE); if (i_size >= HPAGE_PMD_SIZE && i_size >> PAGE_SHIFT >= off) |
800d8c63b shmem: add huge p... |
1757 |
goto alloc_huge; |
c5bf121e4 mm: refactor swap... |
1758 1759 1760 1761 1762 1763 1764 |
/* fallthrough */ case SHMEM_HUGE_ADVISE: if (sgp_huge == SGP_HUGE) goto alloc_huge; /* TODO: implement fadvise() hints */ goto alloc_nohuge; } |
1da177e4c Linux-2.6.12-rc2 |
1765 |
|
800d8c63b shmem: add huge p... |
1766 |
alloc_huge: |
c5bf121e4 mm: refactor swap... |
1767 1768 1769 1770 1771 1772 1773 1774 |
page = shmem_alloc_and_acct_page(gfp, inode, index, true); if (IS_ERR(page)) { alloc_nohuge: page = shmem_alloc_and_acct_page(gfp, inode, index, false); } if (IS_ERR(page)) { int retry = 5; |
800d8c63b shmem: add huge p... |
1775 |
|
c5bf121e4 mm: refactor swap... |
1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 |
error = PTR_ERR(page); page = NULL; if (error != -ENOSPC) goto unlock; /* * Try to reclaim some space by splitting a huge page * beyond i_size on the filesystem. */ while (retry--) { int ret; |
66d2f4d28 shmem: fix init_p... |
1786 |
|
c5bf121e4 mm: refactor swap... |
1787 1788 1789 1790 1791 |
ret = shmem_unused_huge_shrink(sbinfo, NULL, 1); if (ret == SHRINK_STOP) break; if (ret) goto alloc_nohuge; |
b065b4321 shmem: cleanup sh... |
1792 |
} |
c5bf121e4 mm: refactor swap... |
1793 1794 |
goto unlock; } |
54af60421 tmpfs: convert sh... |
1795 |
|
c5bf121e4 mm: refactor swap... |
1796 1797 1798 1799 |
if (PageTransHuge(page)) hindex = round_down(index, HPAGE_PMD_NR); else hindex = index; |
54af60421 tmpfs: convert sh... |
1800 |
|
c5bf121e4 mm: refactor swap... |
1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 |
if (sgp == SGP_WRITE) __SetPageReferenced(page); error = mem_cgroup_try_charge_delay(page, charge_mm, gfp, &memcg, PageTransHuge(page)); if (error) goto unacct; error = shmem_add_to_page_cache(page, mapping, hindex, NULL, gfp & GFP_RECLAIM_MASK); if (error) { mem_cgroup_cancel_charge(page, memcg, PageTransHuge(page)); goto unacct; } mem_cgroup_commit_charge(page, memcg, false, PageTransHuge(page)); lru_cache_add_anon(page); |
779750d20 shmem: split huge... |
1818 |
|
c5bf121e4 mm: refactor swap... |
1819 |
spin_lock_irq(&info->lock); |
d8c6546b1 mm: introduce com... |
1820 |
info->alloced += compound_nr(page); |
c5bf121e4 mm: refactor swap... |
1821 1822 1823 1824 1825 1826 1827 1828 |
inode->i_blocks += BLOCKS_PER_PAGE << compound_order(page); shmem_recalc_inode(inode); spin_unlock_irq(&info->lock); alloced = true; if (PageTransHuge(page) && DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE) < hindex + HPAGE_PMD_NR - 1) { |
ec9516fbc tmpfs: optimize c... |
1829 |
/* |
c5bf121e4 mm: refactor swap... |
1830 1831 |
* Part of the huge page is beyond i_size: subject * to shrink under memory pressure. |
1635f6a74 tmpfs: undo fallo... |
1832 |
*/ |
c5bf121e4 mm: refactor swap... |
1833 |
spin_lock(&sbinfo->shrinklist_lock); |
1635f6a74 tmpfs: undo fallo... |
1834 |
/* |
c5bf121e4 mm: refactor swap... |
1835 1836 |
* _careful to defend against unlocked access to * ->shrink_list in shmem_unused_huge_shrink() |
ec9516fbc tmpfs: optimize c... |
1837 |
*/ |
c5bf121e4 mm: refactor swap... |
1838 1839 1840 1841 1842 1843 1844 |
if (list_empty_careful(&info->shrinklist)) { list_add_tail(&info->shrinklist, &sbinfo->shrinklist); sbinfo->shrinklist_len++; } spin_unlock(&sbinfo->shrinklist_lock); } |
800d8c63b shmem: add huge p... |
1845 |
|
c5bf121e4 mm: refactor swap... |
1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 |
/* * Let SGP_FALLOC use the SGP_WRITE optimization on a new page. */ if (sgp == SGP_FALLOC) sgp = SGP_WRITE; clear: /* * Let SGP_WRITE caller clear ends if write does not fill page; * but SGP_FALLOC on a page fallocated earlier must initialize * it now, lest undo on failure cancel our earlier guarantee. */ if (sgp != SGP_WRITE && !PageUptodate(page)) { struct page *head = compound_head(page); int i; |
d8c6546b1 mm: introduce com... |
1860 |
for (i = 0; i < compound_nr(head); i++) { |
c5bf121e4 mm: refactor swap... |
1861 1862 |
clear_highpage(head + i); flush_dcache_page(head + i); |
ec9516fbc tmpfs: optimize c... |
1863 |
} |
c5bf121e4 mm: refactor swap... |
1864 |
SetPageUptodate(head); |
1da177e4c Linux-2.6.12-rc2 |
1865 |
} |
bde05d1cc shmem: replace pa... |
1866 |
|
54af60421 tmpfs: convert sh... |
1867 |
/* Perhaps the file has been truncated since we checked */ |
75edd345e tmpfs: preliminar... |
1868 |
if (sgp <= SGP_CACHE && |
09cbfeaf1 mm, fs: get rid o... |
1869 |
((loff_t)index << PAGE_SHIFT) >= i_size_read(inode)) { |
267a4c76b tmpfs: fix shmem_... |
1870 1871 1872 |
if (alloced) { ClearPageDirty(page); delete_from_page_cache(page); |
4595ef88d shmem: make shmem... |
1873 |
spin_lock_irq(&info->lock); |
267a4c76b tmpfs: fix shmem_... |
1874 |
shmem_recalc_inode(inode); |
4595ef88d shmem: make shmem... |
1875 |
spin_unlock_irq(&info->lock); |
267a4c76b tmpfs: fix shmem_... |
1876 |
} |
54af60421 tmpfs: convert sh... |
1877 |
error = -EINVAL; |
267a4c76b tmpfs: fix shmem_... |
1878 |
goto unlock; |
e83c32e8f tmpfs: simplify p... |
1879 |
} |
800d8c63b shmem: add huge p... |
1880 |
*pagep = page + index - hindex; |
54af60421 tmpfs: convert sh... |
1881 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
1882 |
|
59a16ead5 tmpfs: fix spurio... |
1883 |
/* |
54af60421 tmpfs: convert sh... |
1884 |
* Error recovery. |
59a16ead5 tmpfs: fix spurio... |
1885 |
*/ |
54af60421 tmpfs: convert sh... |
1886 |
unacct: |
d8c6546b1 mm: introduce com... |
1887 |
shmem_inode_unacct_blocks(inode, compound_nr(page)); |
800d8c63b shmem: add huge p... |
1888 1889 1890 1891 1892 1893 |
if (PageTransHuge(page)) { unlock_page(page); put_page(page); goto alloc_nohuge; } |
d18992286 shmem: fix negati... |
1894 |
unlock: |
27ab70062 tmpfs: simplify f... |
1895 |
if (page) { |
54af60421 tmpfs: convert sh... |
1896 |
unlock_page(page); |
09cbfeaf1 mm, fs: get rid o... |
1897 |
put_page(page); |
54af60421 tmpfs: convert sh... |
1898 1899 |
} if (error == -ENOSPC && !once++) { |
4595ef88d shmem: make shmem... |
1900 |
spin_lock_irq(&info->lock); |
54af60421 tmpfs: convert sh... |
1901 |
shmem_recalc_inode(inode); |
4595ef88d shmem: make shmem... |
1902 |
spin_unlock_irq(&info->lock); |
27ab70062 tmpfs: simplify f... |
1903 |
goto repeat; |
ff36b8016 shmem: reduce pag... |
1904 |
} |
7f4446eef shmem: Comment fi... |
1905 |
if (error == -EEXIST) |
54af60421 tmpfs: convert sh... |
1906 1907 |
goto repeat; return error; |
1da177e4c Linux-2.6.12-rc2 |
1908 |
} |
10d20bd25 shmem: fix shm fa... |
1909 1910 1911 1912 1913 |
/* * This is like autoremove_wake_function, but it removes the wait queue * entry unconditionally - even if something else had already woken the * target. */ |
ac6424b98 sched/wait: Renam... |
1914 |
static int synchronous_wake_function(wait_queue_entry_t *wait, unsigned mode, int sync, void *key) |
10d20bd25 shmem: fix shm fa... |
1915 1916 |
{ int ret = default_wake_function(wait, mode, sync, key); |
2055da973 sched/wait: Disam... |
1917 |
list_del_init(&wait->entry); |
10d20bd25 shmem: fix shm fa... |
1918 1919 |
return ret; } |
20acce679 mm/shmem.c: use n... |
1920 |
static vm_fault_t shmem_fault(struct vm_fault *vmf) |
1da177e4c Linux-2.6.12-rc2 |
1921 |
{ |
11bac8000 mm, fs: reduce fa... |
1922 |
struct vm_area_struct *vma = vmf->vma; |
496ad9aa8 new helper: file_... |
1923 |
struct inode *inode = file_inode(vma->vm_file); |
9e18eb293 tmpfs: mem_cgroup... |
1924 |
gfp_t gfp = mapping_gfp_mask(inode->i_mapping); |
657e3038c shmem, thp: respe... |
1925 |
enum sgp_type sgp; |
20acce679 mm/shmem.c: use n... |
1926 1927 |
int err; vm_fault_t ret = VM_FAULT_LOCKED; |
1da177e4c Linux-2.6.12-rc2 |
1928 |
|
f00cdc6df shmem: fix faulti... |
1929 1930 1931 1932 |
/* * Trinity finds that probing a hole which tmpfs is punching can * prevent the hole-punch from ever completing: which in turn * locks writers out with its hold on i_mutex. So refrain from |
8e205f779 shmem: fix faulti... |
1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 |
* faulting pages into the hole while it's being punched. Although * shmem_undo_range() does remove the additions, it may be unable to * keep up, as each new page needs its own unmap_mapping_range() call, * and the i_mmap tree grows ever slower to scan if new vmas are added. * * It does not matter if we sometimes reach this check just before the * hole-punch begins, so that one fault then races with the punch: * we just need to make racing faults a rare case. * * The implementation below would be much simpler if we just used a * standard mutex or completion: but we cannot take i_mutex in fault, * and bloating every shmem inode for this unlikely case would be sad. |
f00cdc6df shmem: fix faulti... |
1945 1946 1947 1948 1949 1950 |
*/ if (unlikely(inode->i_private)) { struct shmem_falloc *shmem_falloc; spin_lock(&inode->i_lock); shmem_falloc = inode->i_private; |
8e205f779 shmem: fix faulti... |
1951 1952 1953 1954 |
if (shmem_falloc && shmem_falloc->waitq && vmf->pgoff >= shmem_falloc->start && vmf->pgoff < shmem_falloc->next) { |
d7af03159 shmem: pin the fi... |
1955 |
struct file *fpin; |
8e205f779 shmem: fix faulti... |
1956 |
wait_queue_head_t *shmem_falloc_waitq; |
10d20bd25 shmem: fix shm fa... |
1957 |
DEFINE_WAIT_FUNC(shmem_fault_wait, synchronous_wake_function); |
8e205f779 shmem: fix faulti... |
1958 1959 |
ret = VM_FAULT_NOPAGE; |
d7af03159 shmem: pin the fi... |
1960 1961 |
fpin = maybe_unlock_mmap_for_io(vmf, NULL); if (fpin) |
8e205f779 shmem: fix faulti... |
1962 |
ret = VM_FAULT_RETRY; |
8e205f779 shmem: fix faulti... |
1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 |
shmem_falloc_waitq = shmem_falloc->waitq; prepare_to_wait(shmem_falloc_waitq, &shmem_fault_wait, TASK_UNINTERRUPTIBLE); spin_unlock(&inode->i_lock); schedule(); /* * shmem_falloc_waitq points into the shmem_fallocate() * stack of the hole-punching task: shmem_falloc_waitq * is usually invalid by the time we reach here, but * finish_wait() does not dereference it in that case; * though i_lock needed lest racing with wake_up_all(). */ spin_lock(&inode->i_lock); finish_wait(shmem_falloc_waitq, &shmem_fault_wait); spin_unlock(&inode->i_lock); |
d7af03159 shmem: pin the fi... |
1980 1981 1982 |
if (fpin) fput(fpin); |
8e205f779 shmem: fix faulti... |
1983 |
return ret; |
f00cdc6df shmem: fix faulti... |
1984 |
} |
8e205f779 shmem: fix faulti... |
1985 |
spin_unlock(&inode->i_lock); |
f00cdc6df shmem: fix faulti... |
1986 |
} |
657e3038c shmem, thp: respe... |
1987 |
sgp = SGP_CACHE; |
186003323 mm: make PR_SET_T... |
1988 1989 1990 |
if ((vma->vm_flags & VM_NOHUGEPAGE) || test_bit(MMF_DISABLE_THP, &vma->vm_mm->flags)) |
657e3038c shmem, thp: respe... |
1991 |
sgp = SGP_NOHUGE; |
186003323 mm: make PR_SET_T... |
1992 1993 |
else if (vma->vm_flags & VM_HUGEPAGE) sgp = SGP_HUGE; |
657e3038c shmem, thp: respe... |
1994 |
|
20acce679 mm/shmem.c: use n... |
1995 |
err = shmem_getpage_gfp(inode, vmf->pgoff, &vmf->page, sgp, |
cfda05267 userfaultfd: shme... |
1996 |
gfp, vma, vmf, &ret); |
20acce679 mm/shmem.c: use n... |
1997 1998 |
if (err) return vmf_error(err); |
68da9f055 tmpfs: pass gfp t... |
1999 |
return ret; |
1da177e4c Linux-2.6.12-rc2 |
2000 |
} |
c01d5b300 shmem: get_unmapp... |
2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 |
unsigned long shmem_get_unmapped_area(struct file *file, unsigned long uaddr, unsigned long len, unsigned long pgoff, unsigned long flags) { unsigned long (*get_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); unsigned long addr; unsigned long offset; unsigned long inflated_len; unsigned long inflated_addr; unsigned long inflated_offset; if (len > TASK_SIZE) return -ENOMEM; get_area = current->mm->get_unmapped_area; addr = get_area(file, uaddr, len, pgoff, flags); |
e496cf3d7 thp: introduce CO... |
2018 |
if (!IS_ENABLED(CONFIG_TRANSPARENT_HUGE_PAGECACHE)) |
c01d5b300 shmem: get_unmapp... |
2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 |
return addr; if (IS_ERR_VALUE(addr)) return addr; if (addr & ~PAGE_MASK) return addr; if (addr > TASK_SIZE - len) return addr; if (shmem_huge == SHMEM_HUGE_DENY) return addr; if (len < HPAGE_PMD_SIZE) return addr; if (flags & MAP_FIXED) return addr; /* * Our priority is to support MAP_SHARED mapped hugely; * and support MAP_PRIVATE mapped hugely too, until it is COWed. |
5e56519a9 mm/shmem.c: thp, ... |
2036 2037 |
* But if caller specified an address hint and we allocated area there * successfully, respect that as before. |
c01d5b300 shmem: get_unmapp... |
2038 |
*/ |
5e56519a9 mm/shmem.c: thp, ... |
2039 |
if (uaddr == addr) |
c01d5b300 shmem: get_unmapp... |
2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 |
return addr; if (shmem_huge != SHMEM_HUGE_FORCE) { struct super_block *sb; if (file) { VM_BUG_ON(file->f_op != &shmem_file_operations); sb = file_inode(file)->i_sb; } else { /* * Called directly from mm/mmap.c, or drivers/char/mem.c * for "/dev/zero", to create a shared anonymous object. */ if (IS_ERR(shm_mnt)) return addr; sb = shm_mnt->mnt_sb; } |
3089bf614 shmem: fix tmpfs ... |
2057 |
if (SHMEM_SB(sb)->huge == SHMEM_HUGE_NEVER) |
c01d5b300 shmem: get_unmapp... |
2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 |
return addr; } offset = (pgoff << PAGE_SHIFT) & (HPAGE_PMD_SIZE-1); if (offset && offset + len < 2 * HPAGE_PMD_SIZE) return addr; if ((addr & (HPAGE_PMD_SIZE-1)) == offset) return addr; inflated_len = len + HPAGE_PMD_SIZE - PAGE_SIZE; if (inflated_len > TASK_SIZE) return addr; if (inflated_len < len) return addr; |
5e56519a9 mm/shmem.c: thp, ... |
2072 |
inflated_addr = get_area(NULL, uaddr, inflated_len, 0, flags); |
c01d5b300 shmem: get_unmapp... |
2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 |
if (IS_ERR_VALUE(inflated_addr)) return addr; if (inflated_addr & ~PAGE_MASK) return addr; inflated_offset = inflated_addr & (HPAGE_PMD_SIZE-1); inflated_addr += offset - inflated_offset; if (inflated_offset > offset) inflated_addr += HPAGE_PMD_SIZE; if (inflated_addr > TASK_SIZE - len) return addr; return inflated_addr; } |
1da177e4c Linux-2.6.12-rc2 |
2087 |
#ifdef CONFIG_NUMA |
41ffe5d5c tmpfs: miscellane... |
2088 |
static int shmem_set_policy(struct vm_area_struct *vma, struct mempolicy *mpol) |
1da177e4c Linux-2.6.12-rc2 |
2089 |
{ |
496ad9aa8 new helper: file_... |
2090 |
struct inode *inode = file_inode(vma->vm_file); |
41ffe5d5c tmpfs: miscellane... |
2091 |
return mpol_set_shared_policy(&SHMEM_I(inode)->policy, vma, mpol); |
1da177e4c Linux-2.6.12-rc2 |
2092 |
} |
d8dc74f21 mm/shmem.c: make ... |
2093 2094 |
static struct mempolicy *shmem_get_policy(struct vm_area_struct *vma, unsigned long addr) |
1da177e4c Linux-2.6.12-rc2 |
2095 |
{ |
496ad9aa8 new helper: file_... |
2096 |
struct inode *inode = file_inode(vma->vm_file); |
41ffe5d5c tmpfs: miscellane... |
2097 |
pgoff_t index; |
1da177e4c Linux-2.6.12-rc2 |
2098 |
|
41ffe5d5c tmpfs: miscellane... |
2099 2100 |
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 |
2101 2102 2103 2104 2105 |
} #endif int shmem_lock(struct file *file, int lock, struct user_struct *user) { |
496ad9aa8 new helper: file_... |
2106 |
struct inode *inode = file_inode(file); |
1da177e4c Linux-2.6.12-rc2 |
2107 2108 |
struct shmem_inode_info *info = SHMEM_I(inode); int retval = -ENOMEM; |
a12f3ad8d shmem: fix possib... |
2109 2110 2111 2112 2113 |
/* * What serializes the accesses to info->flags? * ipc_lock_object() when called from shmctl_do_lock(), * no serialization needed when called from shm_destroy(). */ |
1da177e4c Linux-2.6.12-rc2 |
2114 2115 2116 2117 |
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 ... |
2118 |
mapping_set_unevictable(file->f_mapping); |
1da177e4c Linux-2.6.12-rc2 |
2119 2120 2121 2122 |
} if (!lock && (info->flags & VM_LOCKED) && user) { user_shm_unlock(inode->i_size, user); info->flags &= ~VM_LOCKED; |
89e004ea5 SHM_LOCKED pages ... |
2123 |
mapping_clear_unevictable(file->f_mapping); |
1da177e4c Linux-2.6.12-rc2 |
2124 2125 |
} retval = 0; |
89e004ea5 SHM_LOCKED pages ... |
2126 |
|
1da177e4c Linux-2.6.12-rc2 |
2127 |
out_nomem: |
1da177e4c Linux-2.6.12-rc2 |
2128 2129 |
return retval; } |
9b83a6a85 [PATCH] mm/{,tiny... |
2130 |
static int shmem_mmap(struct file *file, struct vm_area_struct *vma) |
1da177e4c Linux-2.6.12-rc2 |
2131 |
{ |
ab3948f58 mm/memfd: add an ... |
2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 |
struct shmem_inode_info *info = SHMEM_I(file_inode(file)); if (info->seals & F_SEAL_FUTURE_WRITE) { /* * New PROT_WRITE and MAP_SHARED mmaps are not allowed when * "future write" seal active. */ if ((vma->vm_flags & VM_SHARED) && (vma->vm_flags & VM_WRITE)) return -EPERM; /* |
4d0f420c8 mm, memfd: fix CO... |
2143 2144 2145 2146 2147 |
* Since an F_SEAL_FUTURE_WRITE sealed memfd can be mapped as * MAP_SHARED and read-only, take care to not allow mprotect to * revert protections on such mappings. Do this only for shared * mappings. For private mappings, don't need to mask * VM_MAYWRITE as we still want them to be COW-writable. |
ab3948f58 mm/memfd: add an ... |
2148 |
*/ |
4d0f420c8 mm, memfd: fix CO... |
2149 2150 |
if (vma->vm_flags & VM_SHARED) vma->vm_flags &= ~(VM_MAYWRITE); |
ab3948f58 mm/memfd: add an ... |
2151 |
} |
1da177e4c Linux-2.6.12-rc2 |
2152 2153 |
file_accessed(file); vma->vm_ops = &shmem_vm_ops; |
e496cf3d7 thp: introduce CO... |
2154 |
if (IS_ENABLED(CONFIG_TRANSPARENT_HUGE_PAGECACHE) && |
f3f0e1d21 khugepaged: add s... |
2155 2156 2157 2158 |
((vma->vm_start + ~HPAGE_PMD_MASK) & HPAGE_PMD_MASK) < (vma->vm_end & HPAGE_PMD_MASK)) { khugepaged_enter(vma, vma->vm_flags); } |
1da177e4c Linux-2.6.12-rc2 |
2159 2160 |
return 0; } |
454abafe9 ramfs: replace in... |
2161 |
static struct inode *shmem_get_inode(struct super_block *sb, const struct inode *dir, |
09208d150 shmem, ramfs: pro... |
2162 |
umode_t mode, dev_t dev, unsigned long flags) |
1da177e4c Linux-2.6.12-rc2 |
2163 2164 2165 2166 |
{ struct inode *inode; struct shmem_inode_info *info; struct shmem_sb_info *sbinfo = SHMEM_SB(sb); |
5b04c6890 shmem: factor out... |
2167 2168 |
if (shmem_reserve_inode(sb)) return NULL; |
1da177e4c Linux-2.6.12-rc2 |
2169 2170 2171 |
inode = new_inode(sb); if (inode) { |
85fe4025c fs: do not assign... |
2172 |
inode->i_ino = get_next_ino(); |
454abafe9 ramfs: replace in... |
2173 |
inode_init_owner(inode, dir, mode); |
1da177e4c Linux-2.6.12-rc2 |
2174 |
inode->i_blocks = 0; |
078cd8279 fs: Replace CURRE... |
2175 |
inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); |
46c9a946d shmem: use monoto... |
2176 |
inode->i_generation = prandom_u32(); |
1da177e4c Linux-2.6.12-rc2 |
2177 2178 2179 |
info = SHMEM_I(inode); memset(info, 0, (char *)inode - (char *)info); spin_lock_init(&info->lock); |
af53d3e9e mm: swapoff: shme... |
2180 |
atomic_set(&info->stop_eviction, 0); |
40e041a2c shm: add sealing API |
2181 |
info->seals = F_SEAL_SEAL; |
0b0a0806b shmem: fix shared... |
2182 |
info->flags = flags & VM_NORESERVE; |
779750d20 shmem: split huge... |
2183 |
INIT_LIST_HEAD(&info->shrinklist); |
1da177e4c Linux-2.6.12-rc2 |
2184 |
INIT_LIST_HEAD(&info->swaplist); |
38f386574 xattr: extract si... |
2185 |
simple_xattrs_init(&info->xattrs); |
72c04902d Get "no acls for ... |
2186 |
cache_no_acl(inode); |
1da177e4c Linux-2.6.12-rc2 |
2187 2188 2189 |
switch (mode & S_IFMT) { default: |
39f0247d3 [PATCH] Access Co... |
2190 |
inode->i_op = &shmem_special_inode_operations; |
1da177e4c Linux-2.6.12-rc2 |
2191 2192 2193 |
init_special_inode(inode, mode, dev); break; case S_IFREG: |
14fcc23fd tmpfs: fix kernel... |
2194 |
inode->i_mapping->a_ops = &shmem_aops; |
1da177e4c Linux-2.6.12-rc2 |
2195 2196 |
inode->i_op = &shmem_inode_operations; inode->i_fop = &shmem_file_operations; |
71fe804b6 mempolicy: use st... |
2197 2198 |
mpol_shared_policy_init(&info->policy, shmem_get_sbmpol(sbinfo)); |
1da177e4c Linux-2.6.12-rc2 |
2199 2200 |
break; case S_IFDIR: |
d8c76e6f4 [PATCH] r/o bind ... |
2201 |
inc_nlink(inode); |
1da177e4c Linux-2.6.12-rc2 |
2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 |
/* 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... |
2212 |
mpol_shared_policy_init(&info->policy, NULL); |
1da177e4c Linux-2.6.12-rc2 |
2213 2214 |
break; } |
b45d71fb8 mm: shmem.c: Corr... |
2215 2216 |
lockdep_annotate_inode_mutex_key(inode); |
5b04c6890 shmem: factor out... |
2217 2218 |
} else shmem_free_inode(sb); |
1da177e4c Linux-2.6.12-rc2 |
2219 2220 |
return inode; } |
0cd6144aa mm + fs: prepare ... |
2221 2222 |
bool shmem_mapping(struct address_space *mapping) { |
f8005451d tmpfs: change shm... |
2223 |
return mapping->a_ops == &shmem_aops; |
0cd6144aa mm + fs: prepare ... |
2224 |
} |
8d1039634 userfaultfd: shme... |
2225 2226 2227 2228 2229 2230 2231 |
static int shmem_mfill_atomic_pte(struct mm_struct *dst_mm, pmd_t *dst_pmd, struct vm_area_struct *dst_vma, unsigned long dst_addr, unsigned long src_addr, bool zeropage, struct page **pagep) |
4c27fe4c4 userfaultfd: shme... |
2232 2233 2234 |
{ struct inode *inode = file_inode(dst_vma->vm_file); struct shmem_inode_info *info = SHMEM_I(inode); |
4c27fe4c4 userfaultfd: shme... |
2235 2236 2237 2238 2239 2240 2241 2242 2243 |
struct address_space *mapping = inode->i_mapping; gfp_t gfp = mapping_gfp_mask(mapping); pgoff_t pgoff = linear_page_index(dst_vma, dst_addr); struct mem_cgroup *memcg; spinlock_t *ptl; void *page_kaddr; struct page *page; pte_t _dst_pte, *dst_pte; int ret; |
e2a50c1f6 userfaultfd: shme... |
2244 |
pgoff_t offset, max_off; |
4c27fe4c4 userfaultfd: shme... |
2245 |
|
cb658a453 userfaultfd: shme... |
2246 |
ret = -ENOMEM; |
0f0796945 shmem: introduce ... |
2247 |
if (!shmem_inode_acct_block(inode, 1)) |
cb658a453 userfaultfd: shme... |
2248 |
goto out; |
4c27fe4c4 userfaultfd: shme... |
2249 |
|
cb658a453 userfaultfd: shme... |
2250 |
if (!*pagep) { |
4c27fe4c4 userfaultfd: shme... |
2251 2252 |
page = shmem_alloc_page(gfp, info, pgoff); if (!page) |
0f0796945 shmem: introduce ... |
2253 |
goto out_unacct_blocks; |
4c27fe4c4 userfaultfd: shme... |
2254 |
|
8d1039634 userfaultfd: shme... |
2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 |
if (!zeropage) { /* mcopy_atomic */ page_kaddr = kmap_atomic(page); ret = copy_from_user(page_kaddr, (const void __user *)src_addr, PAGE_SIZE); kunmap_atomic(page_kaddr); /* fallback to copy_from_user outside mmap_sem */ if (unlikely(ret)) { *pagep = page; shmem_inode_unacct_blocks(inode, 1); /* don't free the page */ |
9e368259a userfaultfd: use ... |
2267 |
return -ENOENT; |
8d1039634 userfaultfd: shme... |
2268 2269 2270 |
} } else { /* mfill_zeropage_atomic */ clear_highpage(page); |
4c27fe4c4 userfaultfd: shme... |
2271 2272 2273 2274 2275 |
} } else { page = *pagep; *pagep = NULL; } |
9cc90c664 userfaultfd: shme... |
2276 2277 2278 |
VM_BUG_ON(PageLocked(page) || PageSwapBacked(page)); __SetPageLocked(page); __SetPageSwapBacked(page); |
a425d3584 userfaultfd: shme... |
2279 |
__SetPageUptodate(page); |
9cc90c664 userfaultfd: shme... |
2280 |
|
e2a50c1f6 userfaultfd: shme... |
2281 2282 2283 2284 2285 |
ret = -EFAULT; offset = linear_page_index(dst_vma, dst_addr); max_off = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE); if (unlikely(offset >= max_off)) goto out_release; |
2cf855837 memcontrol: sched... |
2286 |
ret = mem_cgroup_try_charge_delay(page, dst_mm, gfp, &memcg, false); |
4c27fe4c4 userfaultfd: shme... |
2287 2288 |
if (ret) goto out_release; |
552446a41 shmem: Convert sh... |
2289 2290 |
ret = shmem_add_to_page_cache(page, mapping, pgoff, NULL, gfp & GFP_RECLAIM_MASK); |
4c27fe4c4 userfaultfd: shme... |
2291 2292 2293 2294 2295 2296 2297 2298 |
if (ret) goto out_release_uncharge; mem_cgroup_commit_charge(page, memcg, false, false); _dst_pte = mk_pte(page, dst_vma->vm_page_prot); if (dst_vma->vm_flags & VM_WRITE) _dst_pte = pte_mkwrite(pte_mkdirty(_dst_pte)); |
dcf7fe9d8 userfaultfd: shme... |
2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 |
else { /* * We don't set the pte dirty if the vma has no * VM_WRITE permission, so mark the page dirty or it * could be freed from under us. We could do it * unconditionally before unlock_page(), but doing it * only if VM_WRITE is not set is faster. */ set_page_dirty(page); } |
4c27fe4c4 userfaultfd: shme... |
2309 |
|
4c27fe4c4 userfaultfd: shme... |
2310 |
dst_pte = pte_offset_map_lock(dst_mm, dst_pmd, dst_addr, &ptl); |
e2a50c1f6 userfaultfd: shme... |
2311 2312 2313 2314 2315 2316 2317 |
ret = -EFAULT; max_off = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE); if (unlikely(offset >= max_off)) goto out_release_uncharge_unlock; ret = -EEXIST; |
4c27fe4c4 userfaultfd: shme... |
2318 2319 |
if (!pte_none(*dst_pte)) goto out_release_uncharge_unlock; |
4c27fe4c4 userfaultfd: shme... |
2320 |
lru_cache_add_anon(page); |
e5329fcdc mm: shmem: disabl... |
2321 |
spin_lock_irq(&info->lock); |
4c27fe4c4 userfaultfd: shme... |
2322 2323 2324 |
info->alloced++; inode->i_blocks += BLOCKS_PER_PAGE; shmem_recalc_inode(inode); |
e5329fcdc mm: shmem: disabl... |
2325 |
spin_unlock_irq(&info->lock); |
4c27fe4c4 userfaultfd: shme... |
2326 2327 2328 2329 2330 2331 2332 |
inc_mm_counter(dst_mm, mm_counter_file(page)); page_add_file_rmap(page, false); set_pte_at(dst_mm, dst_addr, dst_pte, _dst_pte); /* No need to invalidate - it was non-present before */ update_mmu_cache(dst_vma, dst_addr, dst_pte); |
4c27fe4c4 userfaultfd: shme... |
2333 |
pte_unmap_unlock(dst_pte, ptl); |
e2a50c1f6 userfaultfd: shme... |
2334 |
unlock_page(page); |
4c27fe4c4 userfaultfd: shme... |
2335 2336 2337 2338 2339 |
ret = 0; out: return ret; out_release_uncharge_unlock: pte_unmap_unlock(dst_pte, ptl); |
dcf7fe9d8 userfaultfd: shme... |
2340 |
ClearPageDirty(page); |
e2a50c1f6 userfaultfd: shme... |
2341 |
delete_from_page_cache(page); |
4c27fe4c4 userfaultfd: shme... |
2342 2343 2344 |
out_release_uncharge: mem_cgroup_cancel_charge(page, memcg, false); out_release: |
9cc90c664 userfaultfd: shme... |
2345 |
unlock_page(page); |
4c27fe4c4 userfaultfd: shme... |
2346 |
put_page(page); |
4c27fe4c4 userfaultfd: shme... |
2347 |
out_unacct_blocks: |
0f0796945 shmem: introduce ... |
2348 |
shmem_inode_unacct_blocks(inode, 1); |
4c27fe4c4 userfaultfd: shme... |
2349 2350 |
goto out; } |
8d1039634 userfaultfd: shme... |
2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 |
int shmem_mcopy_atomic_pte(struct mm_struct *dst_mm, pmd_t *dst_pmd, struct vm_area_struct *dst_vma, unsigned long dst_addr, unsigned long src_addr, struct page **pagep) { return shmem_mfill_atomic_pte(dst_mm, dst_pmd, dst_vma, dst_addr, src_addr, false, pagep); } int shmem_mfill_zeropage_pte(struct mm_struct *dst_mm, pmd_t *dst_pmd, struct vm_area_struct *dst_vma, unsigned long dst_addr) { struct page *page = NULL; return shmem_mfill_atomic_pte(dst_mm, dst_pmd, dst_vma, dst_addr, 0, true, &page); } |
1da177e4c Linux-2.6.12-rc2 |
2372 |
#ifdef CONFIG_TMPFS |
92e1d5be9 [PATCH] mark stru... |
2373 |
static const struct inode_operations shmem_symlink_inode_operations; |
69f07ec93 tmpfs: use kmemdu... |
2374 |
static const struct inode_operations shmem_short_symlink_operations; |
1da177e4c Linux-2.6.12-rc2 |
2375 |
|
6d9d88d07 tmpfs: security x... |
2376 2377 2378 2379 2380 |
#ifdef CONFIG_TMPFS_XATTR static int shmem_initxattrs(struct inode *, const struct xattr *, void *); #else #define shmem_initxattrs NULL #endif |
1da177e4c Linux-2.6.12-rc2 |
2381 |
static int |
800d15a53 implement simple ... |
2382 2383 2384 |
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 |
2385 |
{ |
800d15a53 implement simple ... |
2386 |
struct inode *inode = mapping->host; |
40e041a2c shm: add sealing API |
2387 |
struct shmem_inode_info *info = SHMEM_I(inode); |
09cbfeaf1 mm, fs: get rid o... |
2388 |
pgoff_t index = pos >> PAGE_SHIFT; |
40e041a2c shm: add sealing API |
2389 2390 |
/* i_mutex is held by caller */ |
ab3948f58 mm/memfd: add an ... |
2391 2392 2393 |
if (unlikely(info->seals & (F_SEAL_GROW | F_SEAL_WRITE | F_SEAL_FUTURE_WRITE))) { if (info->seals & (F_SEAL_WRITE | F_SEAL_FUTURE_WRITE)) |
40e041a2c shm: add sealing API |
2394 2395 2396 2397 |
return -EPERM; if ((info->seals & F_SEAL_GROW) && pos + len > inode->i_size) return -EPERM; } |
9e18eb293 tmpfs: mem_cgroup... |
2398 |
return shmem_getpage(inode, index, pagep, SGP_WRITE); |
800d15a53 implement simple ... |
2399 2400 2401 2402 2403 2404 2405 2406 |
} 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... |
2407 2408 |
if (pos + copied > inode->i_size) i_size_write(inode, pos + copied); |
ec9516fbc tmpfs: optimize c... |
2409 |
if (!PageUptodate(page)) { |
800d8c63b shmem: add huge p... |
2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 |
struct page *head = compound_head(page); if (PageTransCompound(page)) { int i; for (i = 0; i < HPAGE_PMD_NR; i++) { if (head + i == page) continue; clear_highpage(head + i); flush_dcache_page(head + i); } } |
09cbfeaf1 mm, fs: get rid o... |
2421 2422 |
if (copied < PAGE_SIZE) { unsigned from = pos & (PAGE_SIZE - 1); |
ec9516fbc tmpfs: optimize c... |
2423 |
zero_user_segments(page, 0, from, |
09cbfeaf1 mm, fs: get rid o... |
2424 |
from + copied, PAGE_SIZE); |
ec9516fbc tmpfs: optimize c... |
2425 |
} |
800d8c63b shmem: add huge p... |
2426 |
SetPageUptodate(head); |
ec9516fbc tmpfs: optimize c... |
2427 |
} |
800d15a53 implement simple ... |
2428 |
set_page_dirty(page); |
6746aff74 HWPOISON: shmem: ... |
2429 |
unlock_page(page); |
09cbfeaf1 mm, fs: get rid o... |
2430 |
put_page(page); |
800d15a53 implement simple ... |
2431 |
|
800d15a53 implement simple ... |
2432 |
return copied; |
1da177e4c Linux-2.6.12-rc2 |
2433 |
} |
2ba5bbed0 shmem: switch to ... |
2434 |
static ssize_t shmem_file_read_iter(struct kiocb *iocb, struct iov_iter *to) |
1da177e4c Linux-2.6.12-rc2 |
2435 |
{ |
6e58e79db introduce copy_pa... |
2436 2437 |
struct file *file = iocb->ki_filp; struct inode *inode = file_inode(file); |
1da177e4c Linux-2.6.12-rc2 |
2438 |
struct address_space *mapping = inode->i_mapping; |
41ffe5d5c tmpfs: miscellane... |
2439 2440 |
pgoff_t index; unsigned long offset; |
a0ee5ec52 tmpfs: allocate o... |
2441 |
enum sgp_type sgp = SGP_READ; |
f7c1d0742 mm: Initialize er... |
2442 |
int error = 0; |
cb66a7a1f kill generic_segm... |
2443 |
ssize_t retval = 0; |
6e58e79db introduce copy_pa... |
2444 |
loff_t *ppos = &iocb->ki_pos; |
a0ee5ec52 tmpfs: allocate o... |
2445 2446 2447 2448 2449 2450 |
/* * Might this read be for a stacking filesystem? Then when reading * holes of a sparse file, we actually need to allocate those pages, * and even mark them dirty, so it cannot exceed the max_blocks limit. */ |
777eda2c5 new helper: iter_... |
2451 |
if (!iter_is_iovec(to)) |
75edd345e tmpfs: preliminar... |
2452 |
sgp = SGP_CACHE; |
1da177e4c Linux-2.6.12-rc2 |
2453 |
|
09cbfeaf1 mm, fs: get rid o... |
2454 2455 |
index = *ppos >> PAGE_SHIFT; offset = *ppos & ~PAGE_MASK; |
1da177e4c Linux-2.6.12-rc2 |
2456 2457 2458 |
for (;;) { struct page *page = NULL; |
41ffe5d5c tmpfs: miscellane... |
2459 2460 |
pgoff_t end_index; unsigned long nr, ret; |
1da177e4c Linux-2.6.12-rc2 |
2461 |
loff_t i_size = i_size_read(inode); |
09cbfeaf1 mm, fs: get rid o... |
2462 |
end_index = i_size >> PAGE_SHIFT; |
1da177e4c Linux-2.6.12-rc2 |
2463 2464 2465 |
if (index > end_index) break; if (index == end_index) { |
09cbfeaf1 mm, fs: get rid o... |
2466 |
nr = i_size & ~PAGE_MASK; |
1da177e4c Linux-2.6.12-rc2 |
2467 2468 2469 |
if (nr <= offset) break; } |
9e18eb293 tmpfs: mem_cgroup... |
2470 |
error = shmem_getpage(inode, index, &page, sgp); |
6e58e79db introduce copy_pa... |
2471 2472 2473 |
if (error) { if (error == -EINVAL) error = 0; |
1da177e4c Linux-2.6.12-rc2 |
2474 2475 |
break; } |
75edd345e tmpfs: preliminar... |
2476 2477 2478 |
if (page) { if (sgp == SGP_CACHE) set_page_dirty(page); |
d3602444e shmem_getpage ret... |
2479 |
unlock_page(page); |
75edd345e tmpfs: preliminar... |
2480 |
} |
1da177e4c Linux-2.6.12-rc2 |
2481 2482 2483 |
/* * We must evaluate after, since reads (unlike writes) |
1b1dcc1b5 [PATCH] mutex sub... |
2484 |
* are called without i_mutex protection against truncate |
1da177e4c Linux-2.6.12-rc2 |
2485 |
*/ |
09cbfeaf1 mm, fs: get rid o... |
2486 |
nr = PAGE_SIZE; |
1da177e4c Linux-2.6.12-rc2 |
2487 |
i_size = i_size_read(inode); |
09cbfeaf1 mm, fs: get rid o... |
2488 |
end_index = i_size >> PAGE_SHIFT; |
1da177e4c Linux-2.6.12-rc2 |
2489 |
if (index == end_index) { |
09cbfeaf1 mm, fs: get rid o... |
2490 |
nr = i_size & ~PAGE_MASK; |
1da177e4c Linux-2.6.12-rc2 |
2491 2492 |
if (nr <= offset) { if (page) |
09cbfeaf1 mm, fs: get rid o... |
2493 |
put_page(page); |
1da177e4c Linux-2.6.12-rc2 |
2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 |
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... |
2512 |
} else { |
1da177e4c Linux-2.6.12-rc2 |
2513 |
page = ZERO_PAGE(0); |
09cbfeaf1 mm, fs: get rid o... |
2514 |
get_page(page); |
b5810039a [PATCH] core remo... |
2515 |
} |
1da177e4c Linux-2.6.12-rc2 |
2516 2517 2518 2519 |
/* * Ok, we have the page, and it's up-to-date, so * now we can copy it to user space... |
1da177e4c Linux-2.6.12-rc2 |
2520 |
*/ |
2ba5bbed0 shmem: switch to ... |
2521 |
ret = copy_page_to_iter(page, offset, nr, to); |
6e58e79db introduce copy_pa... |
2522 |
retval += ret; |
1da177e4c Linux-2.6.12-rc2 |
2523 |
offset += ret; |
09cbfeaf1 mm, fs: get rid o... |
2524 2525 |
index += offset >> PAGE_SHIFT; offset &= ~PAGE_MASK; |
1da177e4c Linux-2.6.12-rc2 |
2526 |
|
09cbfeaf1 mm, fs: get rid o... |
2527 |
put_page(page); |
2ba5bbed0 shmem: switch to ... |
2528 |
if (!iov_iter_count(to)) |
1da177e4c Linux-2.6.12-rc2 |
2529 |
break; |
6e58e79db introduce copy_pa... |
2530 2531 2532 2533 |
if (ret < nr) { error = -EFAULT; break; } |
1da177e4c Linux-2.6.12-rc2 |
2534 2535 |
cond_resched(); } |
09cbfeaf1 mm, fs: get rid o... |
2536 |
*ppos = ((loff_t) index << PAGE_SHIFT) + offset; |
6e58e79db introduce copy_pa... |
2537 2538 |
file_accessed(file); return retval ? retval : error; |
1da177e4c Linux-2.6.12-rc2 |
2539 |
} |
220f2ac91 tmpfs: support SE... |
2540 |
/* |
7f4446eef shmem: Comment fi... |
2541 |
* llseek SEEK_DATA or SEEK_HOLE through the page cache. |
220f2ac91 tmpfs: support SE... |
2542 2543 |
*/ static pgoff_t shmem_seek_hole_data(struct address_space *mapping, |
965c8e59c lseek: the "whenc... |
2544 |
pgoff_t index, pgoff_t end, int whence) |
220f2ac91 tmpfs: support SE... |
2545 2546 2547 2548 2549 2550 |
{ struct page *page; struct pagevec pvec; pgoff_t indices[PAGEVEC_SIZE]; bool done = false; int i; |
866798201 mm, pagevec: remo... |
2551 |
pagevec_init(&pvec); |
220f2ac91 tmpfs: support SE... |
2552 2553 |
pvec.nr = 1; /* start small: we may be there already */ while (!done) { |
0cd6144aa mm + fs: prepare ... |
2554 |
pvec.nr = find_get_entries(mapping, index, |
220f2ac91 tmpfs: support SE... |
2555 2556 |
pvec.nr, pvec.pages, indices); if (!pvec.nr) { |
965c8e59c lseek: the "whenc... |
2557 |
if (whence == SEEK_DATA) |
220f2ac91 tmpfs: support SE... |
2558 2559 2560 2561 2562 |
index = end; break; } for (i = 0; i < pvec.nr; i++, index++) { if (index < indices[i]) { |
965c8e59c lseek: the "whenc... |
2563 |
if (whence == SEEK_HOLE) { |
220f2ac91 tmpfs: support SE... |
2564 2565 2566 2567 2568 2569 |
done = true; break; } index = indices[i]; } page = pvec.pages[i]; |
3159f943a xarray: Replace e... |
2570 |
if (page && !xa_is_value(page)) { |
220f2ac91 tmpfs: support SE... |
2571 2572 2573 2574 |
if (!PageUptodate(page)) page = NULL; } if (index >= end || |
965c8e59c lseek: the "whenc... |
2575 2576 |
(page && whence == SEEK_DATA) || (!page && whence == SEEK_HOLE)) { |
220f2ac91 tmpfs: support SE... |
2577 2578 2579 2580 |
done = true; break; } } |
0cd6144aa mm + fs: prepare ... |
2581 |
pagevec_remove_exceptionals(&pvec); |
220f2ac91 tmpfs: support SE... |
2582 2583 2584 2585 2586 2587 |
pagevec_release(&pvec); pvec.nr = PAGEVEC_SIZE; cond_resched(); } return index; } |
965c8e59c lseek: the "whenc... |
2588 |
static loff_t shmem_file_llseek(struct file *file, loff_t offset, int whence) |
220f2ac91 tmpfs: support SE... |
2589 2590 2591 2592 2593 |
{ struct address_space *mapping = file->f_mapping; struct inode *inode = mapping->host; pgoff_t start, end; loff_t new_offset; |
965c8e59c lseek: the "whenc... |
2594 2595 |
if (whence != SEEK_DATA && whence != SEEK_HOLE) return generic_file_llseek_size(file, offset, whence, |
220f2ac91 tmpfs: support SE... |
2596 |
MAX_LFS_FILESIZE, i_size_read(inode)); |
5955102c9 wrappers for ->i_... |
2597 |
inode_lock(inode); |
220f2ac91 tmpfs: support SE... |
2598 |
/* We're holding i_mutex so we can access i_size directly */ |
1a4136469 tmpfs: make lseek... |
2599 |
if (offset < 0 || offset >= inode->i_size) |
220f2ac91 tmpfs: support SE... |
2600 2601 |
offset = -ENXIO; else { |
09cbfeaf1 mm, fs: get rid o... |
2602 2603 |
start = offset >> PAGE_SHIFT; end = (inode->i_size + PAGE_SIZE - 1) >> PAGE_SHIFT; |
965c8e59c lseek: the "whenc... |
2604 |
new_offset = shmem_seek_hole_data(mapping, start, end, whence); |
09cbfeaf1 mm, fs: get rid o... |
2605 |
new_offset <<= PAGE_SHIFT; |
220f2ac91 tmpfs: support SE... |
2606 2607 2608 |
if (new_offset > offset) { if (new_offset < inode->i_size) offset = new_offset; |
965c8e59c lseek: the "whenc... |
2609 |
else if (whence == SEEK_DATA) |
220f2ac91 tmpfs: support SE... |
2610 2611 2612 2613 2614 |
offset = -ENXIO; else offset = inode->i_size; } } |
387aae6fd tmpfs: fix SEEK_D... |
2615 2616 |
if (offset >= 0) offset = vfs_setpos(file, offset, MAX_LFS_FILESIZE); |
5955102c9 wrappers for ->i_... |
2617 |
inode_unlock(inode); |
220f2ac91 tmpfs: support SE... |
2618 2619 |
return offset; } |
83e4fa9c1 tmpfs: support fa... |
2620 2621 2622 |
static long shmem_fallocate(struct file *file, int mode, loff_t offset, loff_t len) { |
496ad9aa8 new helper: file_... |
2623 |
struct inode *inode = file_inode(file); |
e2d12e22c tmpfs: support fa... |
2624 |
struct shmem_sb_info *sbinfo = SHMEM_SB(inode->i_sb); |
40e041a2c shm: add sealing API |
2625 |
struct shmem_inode_info *info = SHMEM_I(inode); |
1aac14003 tmpfs: quit when ... |
2626 |
struct shmem_falloc shmem_falloc; |
e2d12e22c tmpfs: support fa... |
2627 2628 |
pgoff_t start, index, end; int error; |
83e4fa9c1 tmpfs: support fa... |
2629 |
|
13ace4d0d tmpfs: ZERO_RANGE... |
2630 2631 |
if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE)) return -EOPNOTSUPP; |
5955102c9 wrappers for ->i_... |
2632 |
inode_lock(inode); |
83e4fa9c1 tmpfs: support fa... |
2633 2634 2635 2636 2637 |
if (mode & FALLOC_FL_PUNCH_HOLE) { struct address_space *mapping = file->f_mapping; loff_t unmap_start = round_up(offset, PAGE_SIZE); loff_t unmap_end = round_down(offset + len, PAGE_SIZE) - 1; |
8e205f779 shmem: fix faulti... |
2638 |
DECLARE_WAIT_QUEUE_HEAD_ONSTACK(shmem_falloc_waitq); |
83e4fa9c1 tmpfs: support fa... |
2639 |
|
40e041a2c shm: add sealing API |
2640 |
/* protected by i_mutex */ |
ab3948f58 mm/memfd: add an ... |
2641 |
if (info->seals & (F_SEAL_WRITE | F_SEAL_FUTURE_WRITE)) { |
40e041a2c shm: add sealing API |
2642 2643 2644 |
error = -EPERM; goto out; } |
8e205f779 shmem: fix faulti... |
2645 |
shmem_falloc.waitq = &shmem_falloc_waitq; |
12de9bf4b mm/shmem.c: cast ... |
2646 |
shmem_falloc.start = (u64)unmap_start >> PAGE_SHIFT; |
f00cdc6df shmem: fix faulti... |
2647 2648 2649 2650 |
shmem_falloc.next = (unmap_end + 1) >> PAGE_SHIFT; spin_lock(&inode->i_lock); inode->i_private = &shmem_falloc; spin_unlock(&inode->i_lock); |
83e4fa9c1 tmpfs: support fa... |
2651 2652 2653 2654 2655 |
if ((u64)unmap_end > (u64)unmap_start) unmap_mapping_range(mapping, unmap_start, 1 + unmap_end - unmap_start, 0); shmem_truncate_range(inode, offset, offset + len - 1); /* No need to unmap again: hole-punching leaves COWed pages */ |
8e205f779 shmem: fix faulti... |
2656 2657 2658 2659 |
spin_lock(&inode->i_lock); inode->i_private = NULL; wake_up_all(&shmem_falloc_waitq); |
2055da973 sched/wait: Disam... |
2660 |
WARN_ON_ONCE(!list_empty(&shmem_falloc_waitq.head)); |
8e205f779 shmem: fix faulti... |
2661 |
spin_unlock(&inode->i_lock); |
83e4fa9c1 tmpfs: support fa... |
2662 |
error = 0; |
8e205f779 shmem: fix faulti... |
2663 |
goto out; |
e2d12e22c tmpfs: support fa... |
2664 2665 2666 2667 2668 2669 |
} /* We need to check rlimit even when FALLOC_FL_KEEP_SIZE */ error = inode_newsize_ok(inode, offset + len); if (error) goto out; |
40e041a2c shm: add sealing API |
2670 2671 2672 2673 |
if ((info->seals & F_SEAL_GROW) && offset + len > inode->i_size) { error = -EPERM; goto out; } |
09cbfeaf1 mm, fs: get rid o... |
2674 2675 |
start = offset >> PAGE_SHIFT; end = (offset + len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
e2d12e22c tmpfs: support fa... |
2676 2677 2678 2679 |
/* Try to avoid a swapstorm if len is impossible to satisfy */ if (sbinfo->max_blocks && end - start > sbinfo->max_blocks) { error = -ENOSPC; goto out; |
83e4fa9c1 tmpfs: support fa... |
2680 |
} |
8e205f779 shmem: fix faulti... |
2681 |
shmem_falloc.waitq = NULL; |
1aac14003 tmpfs: quit when ... |
2682 2683 2684 2685 2686 2687 2688 |
shmem_falloc.start = start; shmem_falloc.next = start; shmem_falloc.nr_falloced = 0; shmem_falloc.nr_unswapped = 0; spin_lock(&inode->i_lock); inode->i_private = &shmem_falloc; spin_unlock(&inode->i_lock); |
e2d12e22c tmpfs: support fa... |
2689 2690 2691 2692 2693 2694 2695 2696 2697 |
for (index = start; index < end; index++) { struct page *page; /* * Good, the fallocate(2) manpage permits EINTR: we may have * been interrupted because we are using up too much memory. */ if (signal_pending(current)) error = -EINTR; |
1aac14003 tmpfs: quit when ... |
2698 2699 |
else if (shmem_falloc.nr_unswapped > shmem_falloc.nr_falloced) error = -ENOMEM; |
e2d12e22c tmpfs: support fa... |
2700 |
else |
9e18eb293 tmpfs: mem_cgroup... |
2701 |
error = shmem_getpage(inode, index, &page, SGP_FALLOC); |
e2d12e22c tmpfs: support fa... |
2702 |
if (error) { |
1635f6a74 tmpfs: undo fallo... |
2703 |
/* Remove the !PageUptodate pages we added */ |
7f5565670 tmpfs: fix regres... |
2704 2705 2706 2707 2708 |
if (index > start) { shmem_undo_range(inode, (loff_t)start << PAGE_SHIFT, ((loff_t)index << PAGE_SHIFT) - 1, true); } |
1aac14003 tmpfs: quit when ... |
2709 |
goto undone; |
e2d12e22c tmpfs: support fa... |
2710 |
} |
e2d12e22c tmpfs: support fa... |
2711 |
/* |
1aac14003 tmpfs: quit when ... |
2712 2713 2714 2715 2716 2717 2718 2719 |
* Inform shmem_writepage() how far we have reached. * No need for lock or barrier: we have the page lock. */ shmem_falloc.next++; if (!PageUptodate(page)) shmem_falloc.nr_falloced++; /* |
1635f6a74 tmpfs: undo fallo... |
2720 2721 2722 |
* If !PageUptodate, leave it that way so that freeable pages * can be recognized if we need to rollback on error later. * But set_page_dirty so that memory pressure will swap rather |
e2d12e22c tmpfs: support fa... |
2723 2724 2725 2726 2727 |
* than free the pages we are allocating (and SGP_CACHE pages * might still be clean: we now need to mark those dirty too). */ set_page_dirty(page); unlock_page(page); |
09cbfeaf1 mm, fs: get rid o... |
2728 |
put_page(page); |
e2d12e22c tmpfs: support fa... |
2729 2730 2731 2732 2733 |
cond_resched(); } if (!(mode & FALLOC_FL_KEEP_SIZE) && offset + len > inode->i_size) i_size_write(inode, offset + len); |
078cd8279 fs: Replace CURRE... |
2734 |
inode->i_ctime = current_time(inode); |
1aac14003 tmpfs: quit when ... |
2735 2736 2737 2738 |
undone: spin_lock(&inode->i_lock); inode->i_private = NULL; spin_unlock(&inode->i_lock); |
e2d12e22c tmpfs: support fa... |
2739 |
out: |
5955102c9 wrappers for ->i_... |
2740 |
inode_unlock(inode); |
83e4fa9c1 tmpfs: support fa... |
2741 2742 |
return error; } |
726c33422 [PATCH] VFS: Perm... |
2743 |
static int shmem_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4c Linux-2.6.12-rc2 |
2744 |
{ |
726c33422 [PATCH] VFS: Perm... |
2745 |
struct shmem_sb_info *sbinfo = SHMEM_SB(dentry->d_sb); |
1da177e4c Linux-2.6.12-rc2 |
2746 2747 |
buf->f_type = TMPFS_MAGIC; |
09cbfeaf1 mm, fs: get rid o... |
2748 |
buf->f_bsize = PAGE_SIZE; |
1da177e4c Linux-2.6.12-rc2 |
2749 |
buf->f_namelen = NAME_MAX; |
0edd73b33 [PATCH] shmem: re... |
2750 |
if (sbinfo->max_blocks) { |
1da177e4c Linux-2.6.12-rc2 |
2751 |
buf->f_blocks = sbinfo->max_blocks; |
41ffe5d5c tmpfs: miscellane... |
2752 2753 2754 |
buf->f_bavail = buf->f_bfree = sbinfo->max_blocks - percpu_counter_sum(&sbinfo->used_blocks); |
0edd73b33 [PATCH] shmem: re... |
2755 2756 |
} if (sbinfo->max_inodes) { |
1da177e4c Linux-2.6.12-rc2 |
2757 2758 |
buf->f_files = sbinfo->max_inodes; buf->f_ffree = sbinfo->free_inodes; |
1da177e4c Linux-2.6.12-rc2 |
2759 2760 2761 2762 2763 2764 2765 2766 2767 |
} /* else leave those fields 0 like simple_statfs */ return 0; } /* * File creation. Allocate an inode, and we're done.. */ static int |
1a67aafb5 switch ->mknod() ... |
2768 |
shmem_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev) |
1da177e4c Linux-2.6.12-rc2 |
2769 |
{ |
0b0a0806b shmem: fix shared... |
2770 |
struct inode *inode; |
1da177e4c Linux-2.6.12-rc2 |
2771 |
int error = -ENOSPC; |
454abafe9 ramfs: replace in... |
2772 |
inode = shmem_get_inode(dir->i_sb, dir, mode, dev, VM_NORESERVE); |
1da177e4c Linux-2.6.12-rc2 |
2773 |
if (inode) { |
feda821e7 fs: remove generi... |
2774 2775 2776 |
error = simple_acl_create(dir, inode); if (error) goto out_iput; |
2a7dba391 fs/vfs/security: ... |
2777 |
error = security_inode_init_security(inode, dir, |
9d8f13ba3 security: new sec... |
2778 |
&dentry->d_name, |
6d9d88d07 tmpfs: security x... |
2779 |
shmem_initxattrs, NULL); |
feda821e7 fs: remove generi... |
2780 2781 |
if (error && error != -EOPNOTSUPP) goto out_iput; |
37ec43cdc evm: calculate HM... |
2782 |
|
718deb6b6 Fix breakage in s... |
2783 |
error = 0; |
1da177e4c Linux-2.6.12-rc2 |
2784 |
dir->i_size += BOGO_DIRENT_SIZE; |
078cd8279 fs: Replace CURRE... |
2785 |
dir->i_ctime = dir->i_mtime = current_time(dir); |
1da177e4c Linux-2.6.12-rc2 |
2786 2787 |
d_instantiate(dentry, inode); dget(dentry); /* Extra count - pin the dentry in core */ |
1da177e4c Linux-2.6.12-rc2 |
2788 2789 |
} return error; |
feda821e7 fs: remove generi... |
2790 2791 2792 |
out_iput: iput(inode); return error; |
1da177e4c Linux-2.6.12-rc2 |
2793 |
} |
60545d0d4 [O_TMPFILE] it's ... |
2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 |
static int shmem_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode) { struct inode *inode; int error = -ENOSPC; inode = shmem_get_inode(dir->i_sb, dir, mode, 0, VM_NORESERVE); if (inode) { error = security_inode_init_security(inode, dir, NULL, shmem_initxattrs, NULL); |
feda821e7 fs: remove generi... |
2805 2806 2807 2808 2809 |
if (error && error != -EOPNOTSUPP) goto out_iput; error = simple_acl_create(dir, inode); if (error) goto out_iput; |
60545d0d4 [O_TMPFILE] it's ... |
2810 2811 2812 |
d_tmpfile(dentry, inode); } return error; |
feda821e7 fs: remove generi... |
2813 2814 2815 |
out_iput: iput(inode); return error; |
60545d0d4 [O_TMPFILE] it's ... |
2816 |
} |
18bb1db3e switch vfs_mkdir(... |
2817 |
static int shmem_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
1da177e4c Linux-2.6.12-rc2 |
2818 2819 2820 2821 2822 |
{ int error; if ((error = shmem_mknod(dir, dentry, mode | S_IFDIR, 0))) return error; |
d8c76e6f4 [PATCH] r/o bind ... |
2823 |
inc_nlink(dir); |
1da177e4c Linux-2.6.12-rc2 |
2824 2825 |
return 0; } |
4acdaf27e switch ->create()... |
2826 |
static int shmem_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
ebfc3b49a don't pass nameid... |
2827 |
bool excl) |
1da177e4c Linux-2.6.12-rc2 |
2828 2829 2830 2831 2832 2833 2834 2835 2836 |
{ return shmem_mknod(dir, dentry, mode | S_IFREG, 0); } /* * Link a file.. */ static int shmem_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry) { |
75c3cfa85 VFS: assorted wei... |
2837 |
struct inode *inode = d_inode(old_dentry); |
29b00e609 tmpfs: fix uninit... |
2838 |
int ret = 0; |
1da177e4c Linux-2.6.12-rc2 |
2839 2840 2841 2842 2843 |
/* * No ordinary (disk based) filesystem counts links as inodes; * but each new link needs a new dentry, pinning lowmem, and * tmpfs dentries cannot be pruned until they are unlinked. |
1062af920 tmpfs: fix link a... |
2844 2845 |
* But if an O_TMPFILE file is linked into the tmpfs, the * first link must skip that, to get the accounting right. |
1da177e4c Linux-2.6.12-rc2 |
2846 |
*/ |
1062af920 tmpfs: fix link a... |
2847 2848 2849 2850 2851 |
if (inode->i_nlink) { ret = shmem_reserve_inode(inode->i_sb); if (ret) goto out; } |
1da177e4c Linux-2.6.12-rc2 |
2852 2853 |
dir->i_size += BOGO_DIRENT_SIZE; |
078cd8279 fs: Replace CURRE... |
2854 |
inode->i_ctime = dir->i_ctime = dir->i_mtime = current_time(inode); |
d8c76e6f4 [PATCH] r/o bind ... |
2855 |
inc_nlink(inode); |
7de9c6ee3 new helper: ihold() |
2856 |
ihold(inode); /* New dentry reference */ |
1da177e4c Linux-2.6.12-rc2 |
2857 2858 |
dget(dentry); /* Extra pinning count for the created dentry */ d_instantiate(dentry, inode); |
5b04c6890 shmem: factor out... |
2859 2860 |
out: return ret; |
1da177e4c Linux-2.6.12-rc2 |
2861 2862 2863 2864 |
} static int shmem_unlink(struct inode *dir, struct dentry *dentry) { |
75c3cfa85 VFS: assorted wei... |
2865 |
struct inode *inode = d_inode(dentry); |
1da177e4c Linux-2.6.12-rc2 |
2866 |
|
5b04c6890 shmem: factor out... |
2867 2868 |
if (inode->i_nlink > 1 && !S_ISDIR(inode->i_mode)) shmem_free_inode(inode->i_sb); |
1da177e4c Linux-2.6.12-rc2 |
2869 2870 |
dir->i_size -= BOGO_DIRENT_SIZE; |
078cd8279 fs: Replace CURRE... |
2871 |
inode->i_ctime = dir->i_ctime = dir->i_mtime = current_time(inode); |
9a53c3a78 [PATCH] r/o bind ... |
2872 |
drop_nlink(inode); |
1da177e4c Linux-2.6.12-rc2 |
2873 2874 2875 2876 2877 2878 2879 2880 |
dput(dentry); /* Undo the count from "create" - this does all the work */ return 0; } static int shmem_rmdir(struct inode *dir, struct dentry *dentry) { if (!simple_empty(dentry)) return -ENOTEMPTY; |
75c3cfa85 VFS: assorted wei... |
2881 |
drop_nlink(d_inode(dentry)); |
9a53c3a78 [PATCH] r/o bind ... |
2882 |
drop_nlink(dir); |
1da177e4c Linux-2.6.12-rc2 |
2883 2884 |
return shmem_unlink(dir, dentry); } |
37456771c shmem: support RE... |
2885 2886 |
static int shmem_exchange(struct inode *old_dir, struct dentry *old_dentry, struct inode *new_dir, struct dentry *new_dentry) { |
e36cb0b89 VFS: (Scripted) C... |
2887 2888 |
bool old_is_dir = d_is_dir(old_dentry); bool new_is_dir = d_is_dir(new_dentry); |
37456771c shmem: support RE... |
2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 |
if (old_dir != new_dir && old_is_dir != new_is_dir) { if (old_is_dir) { drop_nlink(old_dir); inc_nlink(new_dir); } else { drop_nlink(new_dir); inc_nlink(old_dir); } } old_dir->i_ctime = old_dir->i_mtime = new_dir->i_ctime = new_dir->i_mtime = |
75c3cfa85 VFS: assorted wei... |
2901 |
d_inode(old_dentry)->i_ctime = |
078cd8279 fs: Replace CURRE... |
2902 |
d_inode(new_dentry)->i_ctime = current_time(old_dir); |
37456771c shmem: support RE... |
2903 2904 2905 |
return 0; } |
46fdb794e shmem: support RE... |
2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 |
static int shmem_whiteout(struct inode *old_dir, struct dentry *old_dentry) { struct dentry *whiteout; int error; whiteout = d_alloc(old_dentry->d_parent, &old_dentry->d_name); if (!whiteout) return -ENOMEM; error = shmem_mknod(old_dir, whiteout, S_IFCHR | WHITEOUT_MODE, WHITEOUT_DEV); dput(whiteout); if (error) return error; /* * Cheat and hash the whiteout while the old dentry is still in * place, instead of playing games with FS_RENAME_DOES_D_MOVE. * * d_lookup() will consistently find one of them at this point, * not sure which one, but that isn't even important. */ d_rehash(whiteout); return 0; } |
1da177e4c Linux-2.6.12-rc2 |
2931 2932 2933 2934 2935 2936 |
/* * The VFS layer already does all the dentry stuff for rename, * we just have to decrement the usage count for the target if * it exists so that the VFS layer correctly free's it when it * gets overwritten. */ |
3b69ff51d shmem: support RE... |
2937 |
static int shmem_rename2(struct inode *old_dir, struct dentry *old_dentry, struct inode *new_dir, struct dentry *new_dentry, unsigned int flags) |
1da177e4c Linux-2.6.12-rc2 |
2938 |
{ |
75c3cfa85 VFS: assorted wei... |
2939 |
struct inode *inode = d_inode(old_dentry); |
1da177e4c Linux-2.6.12-rc2 |
2940 |
int they_are_dirs = S_ISDIR(inode->i_mode); |
46fdb794e shmem: support RE... |
2941 |
if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT)) |
3b69ff51d shmem: support RE... |
2942 |
return -EINVAL; |
37456771c shmem: support RE... |
2943 2944 |
if (flags & RENAME_EXCHANGE) return shmem_exchange(old_dir, old_dentry, new_dir, new_dentry); |
1da177e4c Linux-2.6.12-rc2 |
2945 2946 |
if (!simple_empty(new_dentry)) return -ENOTEMPTY; |
46fdb794e shmem: support RE... |
2947 2948 2949 2950 2951 2952 2953 |
if (flags & RENAME_WHITEOUT) { int error; error = shmem_whiteout(old_dir, old_dentry); if (error) return error; } |
75c3cfa85 VFS: assorted wei... |
2954 |
if (d_really_is_positive(new_dentry)) { |
1da177e4c Linux-2.6.12-rc2 |
2955 |
(void) shmem_unlink(new_dir, new_dentry); |
b928095b0 shmem: fix nlink ... |
2956 |
if (they_are_dirs) { |
75c3cfa85 VFS: assorted wei... |
2957 |
drop_nlink(d_inode(new_dentry)); |
9a53c3a78 [PATCH] r/o bind ... |
2958 |
drop_nlink(old_dir); |
b928095b0 shmem: fix nlink ... |
2959 |
} |
1da177e4c Linux-2.6.12-rc2 |
2960 |
} else if (they_are_dirs) { |
9a53c3a78 [PATCH] r/o bind ... |
2961 |
drop_nlink(old_dir); |
d8c76e6f4 [PATCH] r/o bind ... |
2962 |
inc_nlink(new_dir); |
1da177e4c Linux-2.6.12-rc2 |
2963 2964 2965 2966 2967 2968 |
} old_dir->i_size -= BOGO_DIRENT_SIZE; new_dir->i_size += BOGO_DIRENT_SIZE; old_dir->i_ctime = old_dir->i_mtime = new_dir->i_ctime = new_dir->i_mtime = |
078cd8279 fs: Replace CURRE... |
2969 |
inode->i_ctime = current_time(old_dir); |
1da177e4c Linux-2.6.12-rc2 |
2970 2971 2972 2973 2974 2975 2976 2977 |
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... |
2978 |
struct page *page; |
1da177e4c Linux-2.6.12-rc2 |
2979 2980 |
len = strlen(symname) + 1; |
09cbfeaf1 mm, fs: get rid o... |
2981 |
if (len > PAGE_SIZE) |
1da177e4c Linux-2.6.12-rc2 |
2982 |
return -ENAMETOOLONG; |
0825a6f98 mm: use octal not... |
2983 2984 |
inode = shmem_get_inode(dir->i_sb, dir, S_IFLNK | 0777, 0, VM_NORESERVE); |
1da177e4c Linux-2.6.12-rc2 |
2985 2986 |
if (!inode) return -ENOSPC; |
9d8f13ba3 security: new sec... |
2987 |
error = security_inode_init_security(inode, dir, &dentry->d_name, |
6d9d88d07 tmpfs: security x... |
2988 |
shmem_initxattrs, NULL); |
570bc1c2e [PATCH] tmpfs: En... |
2989 2990 2991 2992 2993 2994 2995 |
if (error) { if (error != -EOPNOTSUPP) { iput(inode); return error; } error = 0; } |
1da177e4c Linux-2.6.12-rc2 |
2996 |
inode->i_size = len-1; |
69f07ec93 tmpfs: use kmemdu... |
2997 |
if (len <= SHORT_SYMLINK_LEN) { |
3ed47db34 make sure that fr... |
2998 2999 |
inode->i_link = kmemdup(symname, len, GFP_KERNEL); if (!inode->i_link) { |
69f07ec93 tmpfs: use kmemdu... |
3000 3001 3002 3003 |
iput(inode); return -ENOMEM; } inode->i_op = &shmem_short_symlink_operations; |
1da177e4c Linux-2.6.12-rc2 |
3004 |
} else { |
e8ecde25f Make sure that hi... |
3005 |
inode_nohighmem(inode); |
9e18eb293 tmpfs: mem_cgroup... |
3006 |
error = shmem_getpage(inode, 0, &page, SGP_WRITE); |
1da177e4c Linux-2.6.12-rc2 |
3007 3008 3009 3010 |
if (error) { iput(inode); return error; } |
14fcc23fd tmpfs: fix kernel... |
3011 |
inode->i_mapping->a_ops = &shmem_aops; |
1da177e4c Linux-2.6.12-rc2 |
3012 |
inode->i_op = &shmem_symlink_inode_operations; |
21fc61c73 don't put symlink... |
3013 |
memcpy(page_address(page), symname, len); |
ec9516fbc tmpfs: optimize c... |
3014 |
SetPageUptodate(page); |
1da177e4c Linux-2.6.12-rc2 |
3015 |
set_page_dirty(page); |
6746aff74 HWPOISON: shmem: ... |
3016 |
unlock_page(page); |
09cbfeaf1 mm, fs: get rid o... |
3017 |
put_page(page); |
1da177e4c Linux-2.6.12-rc2 |
3018 |
} |
1da177e4c Linux-2.6.12-rc2 |
3019 |
dir->i_size += BOGO_DIRENT_SIZE; |
078cd8279 fs: Replace CURRE... |
3020 |
dir->i_ctime = dir->i_mtime = current_time(dir); |
1da177e4c Linux-2.6.12-rc2 |
3021 3022 3023 3024 |
d_instantiate(dentry, inode); dget(dentry); return 0; } |
fceef393a switch ->get_link... |
3025 |
static void shmem_put_link(void *arg) |
1da177e4c Linux-2.6.12-rc2 |
3026 |
{ |
fceef393a switch ->get_link... |
3027 3028 |
mark_page_accessed(arg); put_page(arg); |
1da177e4c Linux-2.6.12-rc2 |
3029 |
} |
6b2553918 replace ->follow_... |
3030 |
static const char *shmem_get_link(struct dentry *dentry, |
fceef393a switch ->get_link... |
3031 3032 |
struct inode *inode, struct delayed_call *done) |
1da177e4c Linux-2.6.12-rc2 |
3033 |
{ |
1da177e4c Linux-2.6.12-rc2 |
3034 |
struct page *page = NULL; |
6b2553918 replace ->follow_... |
3035 |
int error; |
6a6c99049 teach shmem_get_l... |
3036 3037 3038 3039 3040 3041 3042 3043 3044 |
if (!dentry) { page = find_get_page(inode->i_mapping, 0); if (!page) return ERR_PTR(-ECHILD); if (!PageUptodate(page)) { put_page(page); return ERR_PTR(-ECHILD); } } else { |
9e18eb293 tmpfs: mem_cgroup... |
3045 |
error = shmem_getpage(inode, 0, &page, SGP_READ); |
6a6c99049 teach shmem_get_l... |
3046 3047 3048 3049 |
if (error) return ERR_PTR(error); unlock_page(page); } |
fceef393a switch ->get_link... |
3050 |
set_delayed_call(done, shmem_put_link, page); |
21fc61c73 don't put symlink... |
3051 |
return page_address(page); |
1da177e4c Linux-2.6.12-rc2 |
3052 |
} |
b09e0fa4b tmpfs: implement ... |
3053 |
#ifdef CONFIG_TMPFS_XATTR |
467118102 mm/shmem and tiny... |
3054 |
/* |
b09e0fa4b tmpfs: implement ... |
3055 3056 |
* 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... |
3057 3058 3059 |
* like ACLs, we also need to implement the security.* handlers at * filesystem level, though. */ |
6d9d88d07 tmpfs: security x... |
3060 |
/* |
6d9d88d07 tmpfs: security x... |
3061 3062 3063 3064 3065 3066 3067 3068 |
* Callback for security_inode_init_security() for acquiring xattrs. */ static int shmem_initxattrs(struct inode *inode, const struct xattr *xattr_array, void *fs_info) { struct shmem_inode_info *info = SHMEM_I(inode); const struct xattr *xattr; |
38f386574 xattr: extract si... |
3069 |
struct simple_xattr *new_xattr; |
6d9d88d07 tmpfs: security x... |
3070 3071 3072 |
size_t len; for (xattr = xattr_array; xattr->name != NULL; xattr++) { |
38f386574 xattr: extract si... |
3073 |
new_xattr = simple_xattr_alloc(xattr->value, xattr->value_len); |
6d9d88d07 tmpfs: security x... |
3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 |
if (!new_xattr) return -ENOMEM; len = strlen(xattr->name) + 1; new_xattr->name = kmalloc(XATTR_SECURITY_PREFIX_LEN + len, GFP_KERNEL); if (!new_xattr->name) { kfree(new_xattr); return -ENOMEM; } memcpy(new_xattr->name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN); memcpy(new_xattr->name + XATTR_SECURITY_PREFIX_LEN, xattr->name, len); |
38f386574 xattr: extract si... |
3089 |
simple_xattr_list_add(&info->xattrs, new_xattr); |
6d9d88d07 tmpfs: security x... |
3090 3091 3092 3093 |
} return 0; } |
aa7c5241c tmpfs: Use xattr ... |
3094 |
static int shmem_xattr_handler_get(const struct xattr_handler *handler, |
b296821a7 xattr_handler: pa... |
3095 3096 |
struct dentry *unused, struct inode *inode, const char *name, void *buffer, size_t size) |
b09e0fa4b tmpfs: implement ... |
3097 |
{ |
b296821a7 xattr_handler: pa... |
3098 |
struct shmem_inode_info *info = SHMEM_I(inode); |
b09e0fa4b tmpfs: implement ... |
3099 |
|
aa7c5241c tmpfs: Use xattr ... |
3100 |
name = xattr_full_name(handler, name); |
38f386574 xattr: extract si... |
3101 |
return simple_xattr_get(&info->xattrs, name, buffer, size); |
b09e0fa4b tmpfs: implement ... |
3102 |
} |
aa7c5241c tmpfs: Use xattr ... |
3103 |
static int shmem_xattr_handler_set(const struct xattr_handler *handler, |
593012268 switch xattr_hand... |
3104 3105 3106 |
struct dentry *unused, struct inode *inode, const char *name, const void *value, size_t size, int flags) |
b09e0fa4b tmpfs: implement ... |
3107 |
{ |
593012268 switch xattr_hand... |
3108 |
struct shmem_inode_info *info = SHMEM_I(inode); |
b09e0fa4b tmpfs: implement ... |
3109 |
|
aa7c5241c tmpfs: Use xattr ... |
3110 |
name = xattr_full_name(handler, name); |
38f386574 xattr: extract si... |
3111 |
return simple_xattr_set(&info->xattrs, name, value, size, flags); |
b09e0fa4b tmpfs: implement ... |
3112 |
} |
aa7c5241c tmpfs: Use xattr ... |
3113 3114 3115 3116 3117 |
static const struct xattr_handler shmem_security_xattr_handler = { .prefix = XATTR_SECURITY_PREFIX, .get = shmem_xattr_handler_get, .set = shmem_xattr_handler_set, }; |
b09e0fa4b tmpfs: implement ... |
3118 |
|
aa7c5241c tmpfs: Use xattr ... |
3119 3120 3121 3122 3123 |
static const struct xattr_handler shmem_trusted_xattr_handler = { .prefix = XATTR_TRUSTED_PREFIX, .get = shmem_xattr_handler_get, .set = shmem_xattr_handler_set, }; |
b09e0fa4b tmpfs: implement ... |
3124 |
|
aa7c5241c tmpfs: Use xattr ... |
3125 3126 3127 3128 3129 3130 3131 3132 3133 |
static const struct xattr_handler *shmem_xattr_handlers[] = { #ifdef CONFIG_TMPFS_POSIX_ACL &posix_acl_access_xattr_handler, &posix_acl_default_xattr_handler, #endif &shmem_security_xattr_handler, &shmem_trusted_xattr_handler, NULL }; |
b09e0fa4b tmpfs: implement ... |
3134 3135 3136 |
static ssize_t shmem_listxattr(struct dentry *dentry, char *buffer, size_t size) { |
75c3cfa85 VFS: assorted wei... |
3137 |
struct shmem_inode_info *info = SHMEM_I(d_inode(dentry)); |
786534b92 tmpfs: listxattr ... |
3138 |
return simple_xattr_list(d_inode(dentry), &info->xattrs, buffer, size); |
b09e0fa4b tmpfs: implement ... |
3139 3140 |
} #endif /* CONFIG_TMPFS_XATTR */ |
69f07ec93 tmpfs: use kmemdu... |
3141 |
static const struct inode_operations shmem_short_symlink_operations = { |
6b2553918 replace ->follow_... |
3142 |
.get_link = simple_get_link, |
b09e0fa4b tmpfs: implement ... |
3143 |
#ifdef CONFIG_TMPFS_XATTR |
b09e0fa4b tmpfs: implement ... |
3144 |
.listxattr = shmem_listxattr, |
b09e0fa4b tmpfs: implement ... |
3145 3146 3147 3148 |
#endif }; static const struct inode_operations shmem_symlink_inode_operations = { |
6b2553918 replace ->follow_... |
3149 |
.get_link = shmem_get_link, |
b09e0fa4b tmpfs: implement ... |
3150 |
#ifdef CONFIG_TMPFS_XATTR |
b09e0fa4b tmpfs: implement ... |
3151 |
.listxattr = shmem_listxattr, |
39f0247d3 [PATCH] Access Co... |
3152 |
#endif |
b09e0fa4b tmpfs: implement ... |
3153 |
}; |
39f0247d3 [PATCH] Access Co... |
3154 |
|
91828a405 [PATCH] knfsd: ad... |
3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166 |
static struct dentry *shmem_get_parent(struct dentry *child) { return ERR_PTR(-ESTALE); } static int shmem_match(struct inode *ino, void *vfh) { __u32 *fh = vfh; __u64 inum = fh[2]; inum = (inum << 32) | fh[1]; return ino->i_ino == inum && fh[0] == ino->i_generation; } |
12ba780d6 tmpfs: allow deco... |
3167 3168 3169 3170 3171 3172 3173 |
/* Find any alias of inode, but prefer a hashed alias */ static struct dentry *shmem_find_alias(struct inode *inode) { struct dentry *alias = d_find_alias(inode); return alias ?: d_find_any_alias(inode); } |
480b116c9 shmem: new export... |
3174 3175 |
static struct dentry *shmem_fh_to_dentry(struct super_block *sb, struct fid *fid, int fh_len, int fh_type) |
91828a405 [PATCH] knfsd: ad... |
3176 |
{ |
91828a405 [PATCH] knfsd: ad... |
3177 |
struct inode *inode; |
480b116c9 shmem: new export... |
3178 |
struct dentry *dentry = NULL; |
35c2a7f49 tmpfs,ceph,gfs2,i... |
3179 |
u64 inum; |
480b116c9 shmem: new export... |
3180 3181 3182 |
if (fh_len < 3) return NULL; |
91828a405 [PATCH] knfsd: ad... |
3183 |
|
35c2a7f49 tmpfs,ceph,gfs2,i... |
3184 3185 |
inum = fid->raw[2]; inum = (inum << 32) | fid->raw[1]; |
480b116c9 shmem: new export... |
3186 3187 |
inode = ilookup5(sb, (unsigned long)(inum + fid->raw[0]), shmem_match, fid->raw); |
91828a405 [PATCH] knfsd: ad... |
3188 |
if (inode) { |
12ba780d6 tmpfs: allow deco... |
3189 |
dentry = shmem_find_alias(inode); |
91828a405 [PATCH] knfsd: ad... |
3190 3191 |
iput(inode); } |
480b116c9 shmem: new export... |
3192 |
return dentry; |
91828a405 [PATCH] knfsd: ad... |
3193 |
} |
b0b0382bb ->encode_fh() API... |
3194 3195 |
static int shmem_encode_fh(struct inode *inode, __u32 *fh, int *len, struct inode *parent) |
91828a405 [PATCH] knfsd: ad... |
3196 |
{ |
5fe0c2378 exportfs: Return ... |
3197 3198 |
if (*len < 3) { *len = 3; |
94e07a759 fs: encode_fh: re... |
3199 |
return FILEID_INVALID; |
5fe0c2378 exportfs: Return ... |
3200 |
} |
91828a405 [PATCH] knfsd: ad... |
3201 |
|
1d3382cbf new helper: inode... |
3202 |
if (inode_unhashed(inode)) { |
91828a405 [PATCH] knfsd: ad... |
3203 3204 3205 3206 3207 3208 3209 |
/* 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... |
3210 |
if (inode_unhashed(inode)) |
91828a405 [PATCH] knfsd: ad... |
3211 3212 3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 |
__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... |
3223 |
static const struct export_operations shmem_export_ops = { |
91828a405 [PATCH] knfsd: ad... |
3224 |
.get_parent = shmem_get_parent, |
91828a405 [PATCH] knfsd: ad... |
3225 |
.encode_fh = shmem_encode_fh, |
480b116c9 shmem: new export... |
3226 |
.fh_to_dentry = shmem_fh_to_dentry, |
91828a405 [PATCH] knfsd: ad... |
3227 |
}; |
626c3920a shmem_parse_one()... |
3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243 3244 3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 |
enum shmem_param { Opt_gid, Opt_huge, Opt_mode, Opt_mpol, Opt_nr_blocks, Opt_nr_inodes, Opt_size, Opt_uid, }; static const struct fs_parameter_spec shmem_param_specs[] = { fsparam_u32 ("gid", Opt_gid), fsparam_enum ("huge", Opt_huge), fsparam_u32oct("mode", Opt_mode), fsparam_string("mpol", Opt_mpol), fsparam_string("nr_blocks", Opt_nr_blocks), fsparam_string("nr_inodes", Opt_nr_inodes), fsparam_string("size", Opt_size), fsparam_u32 ("uid", Opt_uid), {} }; static const struct fs_parameter_enum shmem_param_enums[] = { { Opt_huge, "never", SHMEM_HUGE_NEVER }, { Opt_huge, "always", SHMEM_HUGE_ALWAYS }, { Opt_huge, "within_size", SHMEM_HUGE_WITHIN_SIZE }, { Opt_huge, "advise", SHMEM_HUGE_ADVISE }, {} }; const struct fs_parameter_description shmem_fs_parameters = { .name = "tmpfs", .specs = shmem_param_specs, .enums = shmem_param_enums, }; |
f32356261 vfs: Convert ramf... |
3264 |
static int shmem_parse_one(struct fs_context *fc, struct fs_parameter *param) |
1da177e4c Linux-2.6.12-rc2 |
3265 |
{ |
f32356261 vfs: Convert ramf... |
3266 |
struct shmem_options *ctx = fc->fs_private; |
626c3920a shmem_parse_one()... |
3267 3268 |
struct fs_parse_result result; unsigned long long size; |
e04dc423a shmem_parse_optio... |
3269 |
char *rest; |
626c3920a shmem_parse_one()... |
3270 3271 3272 |
int opt; opt = fs_parse(fc, &shmem_fs_parameters, param, &result); |
f32356261 vfs: Convert ramf... |
3273 |
if (opt < 0) |
626c3920a shmem_parse_one()... |
3274 |
return opt; |
1da177e4c Linux-2.6.12-rc2 |
3275 |
|
626c3920a shmem_parse_one()... |
3276 3277 3278 |
switch (opt) { case Opt_size: size = memparse(param->string, &rest); |
e04dc423a shmem_parse_optio... |
3279 3280 3281 3282 3283 3284 3285 |
if (*rest == '%') { size <<= PAGE_SHIFT; size *= totalram_pages(); do_div(size, 100); rest++; } if (*rest) |
626c3920a shmem_parse_one()... |
3286 |
goto bad_value; |
e04dc423a shmem_parse_optio... |
3287 3288 |
ctx->blocks = DIV_ROUND_UP(size, PAGE_SIZE); ctx->seen |= SHMEM_SEEN_BLOCKS; |
626c3920a shmem_parse_one()... |
3289 3290 3291 |
break; case Opt_nr_blocks: ctx->blocks = memparse(param->string, &rest); |
e04dc423a shmem_parse_optio... |
3292 |
if (*rest) |
626c3920a shmem_parse_one()... |
3293 |
goto bad_value; |
e04dc423a shmem_parse_optio... |
3294 |
ctx->seen |= SHMEM_SEEN_BLOCKS; |
626c3920a shmem_parse_one()... |
3295 3296 3297 |
break; case Opt_nr_inodes: ctx->inodes = memparse(param->string, &rest); |
e04dc423a shmem_parse_optio... |
3298 |
if (*rest) |
626c3920a shmem_parse_one()... |
3299 |
goto bad_value; |
e04dc423a shmem_parse_optio... |
3300 |
ctx->seen |= SHMEM_SEEN_INODES; |
626c3920a shmem_parse_one()... |
3301 3302 3303 3304 3305 3306 |
break; case Opt_mode: ctx->mode = result.uint_32 & 07777; break; case Opt_uid: ctx->uid = make_kuid(current_user_ns(), result.uint_32); |
e04dc423a shmem_parse_optio... |
3307 |
if (!uid_valid(ctx->uid)) |
626c3920a shmem_parse_one()... |
3308 3309 3310 3311 |
goto bad_value; break; case Opt_gid: ctx->gid = make_kgid(current_user_ns(), result.uint_32); |
e04dc423a shmem_parse_optio... |
3312 |
if (!gid_valid(ctx->gid)) |
626c3920a shmem_parse_one()... |
3313 3314 3315 3316 3317 3318 3319 3320 |
goto bad_value; break; case Opt_huge: ctx->huge = result.uint_32; if (ctx->huge != SHMEM_HUGE_NEVER && !(IS_ENABLED(CONFIG_TRANSPARENT_HUGE_PAGECACHE) && has_transparent_hugepage())) goto unsupported_parameter; |
e04dc423a shmem_parse_optio... |
3321 |
ctx->seen |= SHMEM_SEEN_HUGE; |
626c3920a shmem_parse_one()... |
3322 3323 3324 3325 3326 3327 3328 3329 3330 3331 |
break; case Opt_mpol: if (IS_ENABLED(CONFIG_NUMA)) { mpol_put(ctx->mpol); ctx->mpol = NULL; if (mpol_parse_str(param->string, &ctx->mpol)) goto bad_value; break; } goto unsupported_parameter; |
e04dc423a shmem_parse_optio... |
3332 3333 |
} return 0; |
626c3920a shmem_parse_one()... |
3334 3335 3336 3337 |
unsupported_parameter: return invalf(fc, "tmpfs: Unsupported parameter '%s'", param->key); bad_value: return invalf(fc, "tmpfs: Bad value for '%s'", param->key); |
e04dc423a shmem_parse_optio... |
3338 |
} |
f32356261 vfs: Convert ramf... |
3339 |
static int shmem_parse_options(struct fs_context *fc, void *data) |
e04dc423a shmem_parse_optio... |
3340 |
{ |
f32356261 vfs: Convert ramf... |
3341 |
char *options = data; |
33f37c648 shmem: fix LSM op... |
3342 3343 3344 3345 3346 |
if (options) { int err = security_sb_eat_lsm_opts(options, &fc->security); if (err) return err; } |
b00dc3ad7 [PATCH] tmpfs: fi... |
3347 |
while (options != NULL) { |
626c3920a shmem_parse_one()... |
3348 |
char *this_char = options; |
b00dc3ad7 [PATCH] tmpfs: fi... |
3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 |
for (;;) { /* * NUL-terminate this option: unfortunately, * mount options form a comma-separated list, * but mpol's nodelist may also contain commas. */ options = strchr(options, ','); if (options == NULL) break; options++; if (!isdigit(*options)) { options[-1] = '\0'; break; } } |
626c3920a shmem_parse_one()... |
3364 3365 |
if (*this_char) { char *value = strchr(this_char,'='); |
f32356261 vfs: Convert ramf... |
3366 |
size_t len = 0; |
626c3920a shmem_parse_one()... |
3367 3368 3369 3370 |
int err; if (value) { *value++ = '\0'; |
f32356261 vfs: Convert ramf... |
3371 |
len = strlen(value); |
626c3920a shmem_parse_one()... |
3372 |
} |
f32356261 vfs: Convert ramf... |
3373 3374 3375 |
err = vfs_parse_fs_string(fc, this_char, value, len); if (err < 0) return err; |
1da177e4c Linux-2.6.12-rc2 |
3376 |
} |
1da177e4c Linux-2.6.12-rc2 |
3377 3378 |
} return 0; |
1da177e4c Linux-2.6.12-rc2 |
3379 |
} |
f32356261 vfs: Convert ramf... |
3380 3381 3382 3383 3384 3385 3386 3387 |
/* * Reconfigure a shmem filesystem. * * Note that we disallow change from limited->unlimited blocks/inodes while any * are in use; but we must separately disallow unlimited->limited, because in * that case we have no record of how much is already in use. */ static int shmem_reconfigure(struct fs_context *fc) |
1da177e4c Linux-2.6.12-rc2 |
3388 |
{ |
f32356261 vfs: Convert ramf... |
3389 3390 |
struct shmem_options *ctx = fc->fs_private; struct shmem_sb_info *sbinfo = SHMEM_SB(fc->root->d_sb); |
0edd73b33 [PATCH] shmem: re... |
3391 |
unsigned long inodes; |
f32356261 vfs: Convert ramf... |
3392 |
const char *err; |
1da177e4c Linux-2.6.12-rc2 |
3393 |
|
0edd73b33 [PATCH] shmem: re... |
3394 |
spin_lock(&sbinfo->stat_lock); |
0edd73b33 [PATCH] shmem: re... |
3395 |
inodes = sbinfo->max_inodes - sbinfo->free_inodes; |
f32356261 vfs: Convert ramf... |
3396 3397 3398 |
if ((ctx->seen & SHMEM_SEEN_BLOCKS) && ctx->blocks) { if (!sbinfo->max_blocks) { err = "Cannot retroactively limit size"; |
0b5071dd3 shmem_parse_optio... |
3399 |
goto out; |
f32356261 vfs: Convert ramf... |
3400 |
} |
0b5071dd3 shmem_parse_optio... |
3401 |
if (percpu_counter_compare(&sbinfo->used_blocks, |
f32356261 vfs: Convert ramf... |
3402 3403 |
ctx->blocks) > 0) { err = "Too small a size for current use"; |
0b5071dd3 shmem_parse_optio... |
3404 |
goto out; |
f32356261 vfs: Convert ramf... |
3405 |
} |
0b5071dd3 shmem_parse_optio... |
3406 |
} |
f32356261 vfs: Convert ramf... |
3407 3408 3409 |
if ((ctx->seen & SHMEM_SEEN_INODES) && ctx->inodes) { if (!sbinfo->max_inodes) { err = "Cannot retroactively limit inodes"; |
0b5071dd3 shmem_parse_optio... |
3410 |
goto out; |
f32356261 vfs: Convert ramf... |
3411 3412 3413 |
} if (ctx->inodes < inodes) { err = "Too few inodes for current use"; |
0b5071dd3 shmem_parse_optio... |
3414 |
goto out; |
f32356261 vfs: Convert ramf... |
3415 |
} |
0b5071dd3 shmem_parse_optio... |
3416 |
} |
0edd73b33 [PATCH] shmem: re... |
3417 |
|
f32356261 vfs: Convert ramf... |
3418 3419 3420 3421 3422 3423 3424 |
if (ctx->seen & SHMEM_SEEN_HUGE) sbinfo->huge = ctx->huge; if (ctx->seen & SHMEM_SEEN_BLOCKS) sbinfo->max_blocks = ctx->blocks; if (ctx->seen & SHMEM_SEEN_INODES) { sbinfo->max_inodes = ctx->inodes; sbinfo->free_inodes = ctx->inodes - inodes; |
0b5071dd3 shmem_parse_optio... |
3425 |
} |
71fe804b6 mempolicy: use st... |
3426 |
|
5f00110f7 tmpfs: fix use-af... |
3427 3428 3429 |
/* * Preserve previous mempolicy unless mpol remount option was specified. */ |
f32356261 vfs: Convert ramf... |
3430 |
if (ctx->mpol) { |
5f00110f7 tmpfs: fix use-af... |
3431 |
mpol_put(sbinfo->mpol); |
f32356261 vfs: Convert ramf... |
3432 3433 |
sbinfo->mpol = ctx->mpol; /* transfers initial ref */ ctx->mpol = NULL; |
5f00110f7 tmpfs: fix use-af... |
3434 |
} |
f32356261 vfs: Convert ramf... |
3435 3436 |
spin_unlock(&sbinfo->stat_lock); return 0; |
0edd73b33 [PATCH] shmem: re... |
3437 3438 |
out: spin_unlock(&sbinfo->stat_lock); |
f32356261 vfs: Convert ramf... |
3439 |
return invalf(fc, "tmpfs: %s", err); |
1da177e4c Linux-2.6.12-rc2 |
3440 |
} |
680d794ba mount options: fi... |
3441 |
|
34c80b1d9 vfs: switch ->sho... |
3442 |
static int shmem_show_options(struct seq_file *seq, struct dentry *root) |
680d794ba mount options: fi... |
3443 |
{ |
34c80b1d9 vfs: switch ->sho... |
3444 |
struct shmem_sb_info *sbinfo = SHMEM_SB(root->d_sb); |
680d794ba mount options: fi... |
3445 3446 3447 |
if (sbinfo->max_blocks != shmem_default_max_blocks()) seq_printf(seq, ",size=%luk", |
09cbfeaf1 mm, fs: get rid o... |
3448 |
sbinfo->max_blocks << (PAGE_SHIFT - 10)); |
680d794ba mount options: fi... |
3449 3450 |
if (sbinfo->max_inodes != shmem_default_max_inodes()) seq_printf(seq, ",nr_inodes=%lu", sbinfo->max_inodes); |
0825a6f98 mm: use octal not... |
3451 |
if (sbinfo->mode != (0777 | S_ISVTX)) |
09208d150 shmem, ramfs: pro... |
3452 |
seq_printf(seq, ",mode=%03ho", sbinfo->mode); |
8751e0395 userns: Convert t... |
3453 3454 3455 3456 3457 3458 |
if (!uid_eq(sbinfo->uid, GLOBAL_ROOT_UID)) seq_printf(seq, ",uid=%u", from_kuid_munged(&init_user_ns, sbinfo->uid)); if (!gid_eq(sbinfo->gid, GLOBAL_ROOT_GID)) seq_printf(seq, ",gid=%u", from_kgid_munged(&init_user_ns, sbinfo->gid)); |
e496cf3d7 thp: introduce CO... |
3459 |
#ifdef CONFIG_TRANSPARENT_HUGE_PAGECACHE |
5a6e75f81 shmem: prepare hu... |
3460 3461 3462 3463 |
/* Rightly or wrongly, show huge mount option unmasked by shmem_huge */ if (sbinfo->huge) seq_printf(seq, ",huge=%s", shmem_format_huge(sbinfo->huge)); #endif |
71fe804b6 mempolicy: use st... |
3464 |
shmem_show_mpol(seq, sbinfo->mpol); |
680d794ba mount options: fi... |
3465 3466 |
return 0; } |
9183df25f shm: add memfd_cr... |
3467 |
|
680d794ba mount options: fi... |
3468 |
#endif /* CONFIG_TMPFS */ |
1da177e4c Linux-2.6.12-rc2 |
3469 3470 3471 |
static void shmem_put_super(struct super_block *sb) { |
602586a83 shmem: put_super ... |
3472 3473 3474 |
struct shmem_sb_info *sbinfo = SHMEM_SB(sb); percpu_counter_destroy(&sbinfo->used_blocks); |
49cd0a5c2 tmpfs: fix mempol... |
3475 |
mpol_put(sbinfo->mpol); |
602586a83 shmem: put_super ... |
3476 |
kfree(sbinfo); |
1da177e4c Linux-2.6.12-rc2 |
3477 3478 |
sb->s_fs_info = NULL; } |
f32356261 vfs: Convert ramf... |
3479 |
static int shmem_fill_super(struct super_block *sb, struct fs_context *fc) |
1da177e4c Linux-2.6.12-rc2 |
3480 |
{ |
f32356261 vfs: Convert ramf... |
3481 |
struct shmem_options *ctx = fc->fs_private; |
1da177e4c Linux-2.6.12-rc2 |
3482 |
struct inode *inode; |
0edd73b33 [PATCH] shmem: re... |
3483 |
struct shmem_sb_info *sbinfo; |
680d794ba mount options: fi... |
3484 3485 3486 |
int err = -ENOMEM; /* Round up to L1_CACHE_BYTES to resist false sharing */ |
425fbf047 shmem: initialize... |
3487 |
sbinfo = kzalloc(max((int)sizeof(struct shmem_sb_info), |
680d794ba mount options: fi... |
3488 3489 3490 |
L1_CACHE_BYTES), GFP_KERNEL); if (!sbinfo) return -ENOMEM; |
680d794ba mount options: fi... |
3491 |
sb->s_fs_info = sbinfo; |
1da177e4c Linux-2.6.12-rc2 |
3492 |
|
0edd73b33 [PATCH] shmem: re... |
3493 |
#ifdef CONFIG_TMPFS |
1da177e4c Linux-2.6.12-rc2 |
3494 3495 3496 3497 3498 |
/* * Per default we only allow half of the physical ram per * tmpfs instance, limiting inodes to one per page of lowmem; * but the internal instance is left unlimited. */ |
1751e8a6c Rename superblock... |
3499 |
if (!(sb->s_flags & SB_KERNMOUNT)) { |
f32356261 vfs: Convert ramf... |
3500 3501 3502 3503 |
if (!(ctx->seen & SHMEM_SEEN_BLOCKS)) ctx->blocks = shmem_default_max_blocks(); if (!(ctx->seen & SHMEM_SEEN_INODES)) ctx->inodes = shmem_default_max_inodes(); |
ca4e05195 shm_mnt is as lon... |
3504 |
} else { |
1751e8a6c Rename superblock... |
3505 |
sb->s_flags |= SB_NOUSER; |
1da177e4c Linux-2.6.12-rc2 |
3506 |
} |
91828a405 [PATCH] knfsd: ad... |
3507 |
sb->s_export_op = &shmem_export_ops; |
1751e8a6c Rename superblock... |
3508 |
sb->s_flags |= SB_NOSEC; |
1da177e4c Linux-2.6.12-rc2 |
3509 |
#else |
1751e8a6c Rename superblock... |
3510 |
sb->s_flags |= SB_NOUSER; |
1da177e4c Linux-2.6.12-rc2 |
3511 |
#endif |
f32356261 vfs: Convert ramf... |
3512 3513 3514 3515 3516 3517 3518 3519 |
sbinfo->max_blocks = ctx->blocks; sbinfo->free_inodes = sbinfo->max_inodes = ctx->inodes; sbinfo->uid = ctx->uid; sbinfo->gid = ctx->gid; sbinfo->mode = ctx->mode; sbinfo->huge = ctx->huge; sbinfo->mpol = ctx->mpol; ctx->mpol = NULL; |
1da177e4c Linux-2.6.12-rc2 |
3520 |
|
0edd73b33 [PATCH] shmem: re... |
3521 |
spin_lock_init(&sbinfo->stat_lock); |
908c7f194 percpu_counter: a... |
3522 |
if (percpu_counter_init(&sbinfo->used_blocks, 0, GFP_KERNEL)) |
602586a83 shmem: put_super ... |
3523 |
goto failed; |
779750d20 shmem: split huge... |
3524 3525 |
spin_lock_init(&sbinfo->shrinklist_lock); INIT_LIST_HEAD(&sbinfo->shrinklist); |
0edd73b33 [PATCH] shmem: re... |
3526 |
|
285b2c4fd tmpfs: demolish o... |
3527 |
sb->s_maxbytes = MAX_LFS_FILESIZE; |
09cbfeaf1 mm, fs: get rid o... |
3528 3529 |
sb->s_blocksize = PAGE_SIZE; sb->s_blocksize_bits = PAGE_SHIFT; |
1da177e4c Linux-2.6.12-rc2 |
3530 3531 |
sb->s_magic = TMPFS_MAGIC; sb->s_op = &shmem_ops; |
cfd95a9cf [PATCH] tmpfs: ti... |
3532 |
sb->s_time_gran = 1; |
b09e0fa4b tmpfs: implement ... |
3533 |
#ifdef CONFIG_TMPFS_XATTR |
39f0247d3 [PATCH] Access Co... |
3534 |
sb->s_xattr = shmem_xattr_handlers; |
b09e0fa4b tmpfs: implement ... |
3535 3536 |
#endif #ifdef CONFIG_TMPFS_POSIX_ACL |
1751e8a6c Rename superblock... |
3537 |
sb->s_flags |= SB_POSIXACL; |
39f0247d3 [PATCH] Access Co... |
3538 |
#endif |
2b4db7961 tmpfs: generate r... |
3539 |
uuid_gen(&sb->s_uuid); |
0edd73b33 [PATCH] shmem: re... |
3540 |
|
454abafe9 ramfs: replace in... |
3541 |
inode = shmem_get_inode(sb, NULL, S_IFDIR | sbinfo->mode, 0, VM_NORESERVE); |
1da177e4c Linux-2.6.12-rc2 |
3542 3543 |
if (!inode) goto failed; |
680d794ba mount options: fi... |
3544 3545 |
inode->i_uid = sbinfo->uid; inode->i_gid = sbinfo->gid; |
318ceed08 tidy up after d_m... |
3546 3547 |
sb->s_root = d_make_root(inode); if (!sb->s_root) |
48fde701a switch open-coded... |
3548 |
goto failed; |
1da177e4c Linux-2.6.12-rc2 |
3549 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
3550 3551 3552 3553 |
failed: shmem_put_super(sb); return err; } |
f32356261 vfs: Convert ramf... |
3554 3555 3556 3557 3558 3559 3560 3561 3562 3563 3564 3565 3566 3567 3568 3569 3570 3571 3572 3573 3574 3575 3576 3577 |
static int shmem_get_tree(struct fs_context *fc) { return get_tree_nodev(fc, shmem_fill_super); } static void shmem_free_fc(struct fs_context *fc) { struct shmem_options *ctx = fc->fs_private; if (ctx) { mpol_put(ctx->mpol); kfree(ctx); } } static const struct fs_context_operations shmem_fs_context_ops = { .free = shmem_free_fc, .get_tree = shmem_get_tree, #ifdef CONFIG_TMPFS .parse_monolithic = shmem_parse_options, .parse_param = shmem_parse_one, .reconfigure = shmem_reconfigure, #endif }; |
fcc234f88 [PATCH] mm: kill ... |
3578 |
static struct kmem_cache *shmem_inode_cachep; |
1da177e4c Linux-2.6.12-rc2 |
3579 3580 3581 |
static struct inode *shmem_alloc_inode(struct super_block *sb) { |
41ffe5d5c tmpfs: miscellane... |
3582 3583 3584 |
struct shmem_inode_info *info; info = kmem_cache_alloc(shmem_inode_cachep, GFP_KERNEL); if (!info) |
1da177e4c Linux-2.6.12-rc2 |
3585 |
return NULL; |
41ffe5d5c tmpfs: miscellane... |
3586 |
return &info->vfs_inode; |
1da177e4c Linux-2.6.12-rc2 |
3587 |
} |
74b1da564 shmem: make use o... |
3588 |
static void shmem_free_in_core_inode(struct inode *inode) |
fa0d7e3de fs: icache RCU fr... |
3589 |
{ |
84e710da2 parallel lookups ... |
3590 3591 |
if (S_ISLNK(inode->i_mode)) kfree(inode->i_link); |
fa0d7e3de fs: icache RCU fr... |
3592 3593 |
kmem_cache_free(shmem_inode_cachep, SHMEM_I(inode)); } |
1da177e4c Linux-2.6.12-rc2 |
3594 3595 |
static void shmem_destroy_inode(struct inode *inode) { |
09208d150 shmem, ramfs: pro... |
3596 |
if (S_ISREG(inode->i_mode)) |
1da177e4c Linux-2.6.12-rc2 |
3597 |
mpol_free_shared_policy(&SHMEM_I(inode)->policy); |
1da177e4c Linux-2.6.12-rc2 |
3598 |
} |
41ffe5d5c tmpfs: miscellane... |
3599 |
static void shmem_init_inode(void *foo) |
1da177e4c Linux-2.6.12-rc2 |
3600 |
{ |
41ffe5d5c tmpfs: miscellane... |
3601 3602 |
struct shmem_inode_info *info = foo; inode_init_once(&info->vfs_inode); |
1da177e4c Linux-2.6.12-rc2 |
3603 |
} |
9a8ec03ed shmem: convert sh... |
3604 |
static void shmem_init_inodecache(void) |
1da177e4c Linux-2.6.12-rc2 |
3605 3606 3607 |
{ shmem_inode_cachep = kmem_cache_create("shmem_inode_cache", sizeof(struct shmem_inode_info), |
5d097056c kmemcg: account c... |
3608 |
0, SLAB_PANIC|SLAB_ACCOUNT, shmem_init_inode); |
1da177e4c Linux-2.6.12-rc2 |
3609 |
} |
41ffe5d5c tmpfs: miscellane... |
3610 |
static void shmem_destroy_inodecache(void) |
1da177e4c Linux-2.6.12-rc2 |
3611 |
{ |
1a1d92c10 [PATCH] Really ig... |
3612 |
kmem_cache_destroy(shmem_inode_cachep); |
1da177e4c Linux-2.6.12-rc2 |
3613 |
} |
f5e54d6e5 [PATCH] mark addr... |
3614 |
static const struct address_space_operations shmem_aops = { |
1da177e4c Linux-2.6.12-rc2 |
3615 |
.writepage = shmem_writepage, |
767193253 [PATCH] simplify ... |
3616 |
.set_page_dirty = __set_page_dirty_no_writeback, |
1da177e4c Linux-2.6.12-rc2 |
3617 |
#ifdef CONFIG_TMPFS |
800d15a53 implement simple ... |
3618 3619 |
.write_begin = shmem_write_begin, .write_end = shmem_write_end, |
1da177e4c Linux-2.6.12-rc2 |
3620 |
#endif |
1c93923cc include/linux/mig... |
3621 |
#ifdef CONFIG_MIGRATION |
304dbdb7a [PATCH] add migra... |
3622 |
.migratepage = migrate_page, |
1c93923cc include/linux/mig... |
3623 |
#endif |
aa261f549 HWPOISON: Enable ... |
3624 |
.error_remove_page = generic_error_remove_page, |
1da177e4c Linux-2.6.12-rc2 |
3625 |
}; |
15ad7cdcf [PATCH] struct se... |
3626 |
static const struct file_operations shmem_file_operations = { |
1da177e4c Linux-2.6.12-rc2 |
3627 |
.mmap = shmem_mmap, |
c01d5b300 shmem: get_unmapp... |
3628 |
.get_unmapped_area = shmem_get_unmapped_area, |
1da177e4c Linux-2.6.12-rc2 |
3629 |
#ifdef CONFIG_TMPFS |
220f2ac91 tmpfs: support SE... |
3630 |
.llseek = shmem_file_llseek, |
2ba5bbed0 shmem: switch to ... |
3631 |
.read_iter = shmem_file_read_iter, |
8174202b3 write_iter varian... |
3632 |
.write_iter = generic_file_write_iter, |
1b061d924 rename the generi... |
3633 |
.fsync = noop_fsync, |
82c156f85 switch generic_fi... |
3634 |
.splice_read = generic_file_splice_read, |
f6cb85d00 shmem: switch to ... |
3635 |
.splice_write = iter_file_splice_write, |
83e4fa9c1 tmpfs: support fa... |
3636 |
.fallocate = shmem_fallocate, |
1da177e4c Linux-2.6.12-rc2 |
3637 3638 |
#endif }; |
92e1d5be9 [PATCH] mark stru... |
3639 |
static const struct inode_operations shmem_inode_operations = { |
44a30220b shmem: recalculat... |
3640 |
.getattr = shmem_getattr, |
94c1e62df tmpfs: take contr... |
3641 |
.setattr = shmem_setattr, |
b09e0fa4b tmpfs: implement ... |
3642 |
#ifdef CONFIG_TMPFS_XATTR |
b09e0fa4b tmpfs: implement ... |
3643 |
.listxattr = shmem_listxattr, |
feda821e7 fs: remove generi... |
3644 |
.set_acl = simple_set_acl, |
b09e0fa4b tmpfs: implement ... |
3645 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
3646 |
}; |
92e1d5be9 [PATCH] mark stru... |
3647 |
static const struct inode_operations shmem_dir_inode_operations = { |
1da177e4c Linux-2.6.12-rc2 |
3648 3649 3650 3651 3652 3653 3654 3655 3656 |
#ifdef CONFIG_TMPFS .create = shmem_create, .lookup = simple_lookup, .link = shmem_link, .unlink = shmem_unlink, .symlink = shmem_symlink, .mkdir = shmem_mkdir, .rmdir = shmem_rmdir, .mknod = shmem_mknod, |
2773bf00a fs: rename "renam... |
3657 |
.rename = shmem_rename2, |
60545d0d4 [O_TMPFILE] it's ... |
3658 |
.tmpfile = shmem_tmpfile, |
1da177e4c Linux-2.6.12-rc2 |
3659 |
#endif |
b09e0fa4b tmpfs: implement ... |
3660 |
#ifdef CONFIG_TMPFS_XATTR |
b09e0fa4b tmpfs: implement ... |
3661 |
.listxattr = shmem_listxattr, |
b09e0fa4b tmpfs: implement ... |
3662 |
#endif |
39f0247d3 [PATCH] Access Co... |
3663 |
#ifdef CONFIG_TMPFS_POSIX_ACL |
94c1e62df tmpfs: take contr... |
3664 |
.setattr = shmem_setattr, |
feda821e7 fs: remove generi... |
3665 |
.set_acl = simple_set_acl, |
39f0247d3 [PATCH] Access Co... |
3666 3667 |
#endif }; |
92e1d5be9 [PATCH] mark stru... |
3668 |
static const struct inode_operations shmem_special_inode_operations = { |
b09e0fa4b tmpfs: implement ... |
3669 |
#ifdef CONFIG_TMPFS_XATTR |
b09e0fa4b tmpfs: implement ... |
3670 |
.listxattr = shmem_listxattr, |
b09e0fa4b tmpfs: implement ... |
3671 |
#endif |
39f0247d3 [PATCH] Access Co... |
3672 |
#ifdef CONFIG_TMPFS_POSIX_ACL |
94c1e62df tmpfs: take contr... |
3673 |
.setattr = shmem_setattr, |
feda821e7 fs: remove generi... |
3674 |
.set_acl = simple_set_acl, |
39f0247d3 [PATCH] Access Co... |
3675 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
3676 |
}; |
759b9775c [PATCH] shmem and... |
3677 |
static const struct super_operations shmem_ops = { |
1da177e4c Linux-2.6.12-rc2 |
3678 |
.alloc_inode = shmem_alloc_inode, |
74b1da564 shmem: make use o... |
3679 |
.free_inode = shmem_free_in_core_inode, |
1da177e4c Linux-2.6.12-rc2 |
3680 3681 3682 |
.destroy_inode = shmem_destroy_inode, #ifdef CONFIG_TMPFS .statfs = shmem_statfs, |
680d794ba mount options: fi... |
3683 |
.show_options = shmem_show_options, |
1da177e4c Linux-2.6.12-rc2 |
3684 |
#endif |
1f895f75d switch shmem.c to... |
3685 |
.evict_inode = shmem_evict_inode, |
1da177e4c Linux-2.6.12-rc2 |
3686 3687 |
.drop_inode = generic_delete_inode, .put_super = shmem_put_super, |
779750d20 shmem: split huge... |
3688 3689 3690 3691 |
#ifdef CONFIG_TRANSPARENT_HUGE_PAGECACHE .nr_cached_objects = shmem_unused_huge_count, .free_cached_objects = shmem_unused_huge_scan, #endif |
1da177e4c Linux-2.6.12-rc2 |
3692 |
}; |
f0f37e2f7 const: mark struc... |
3693 |
static const struct vm_operations_struct shmem_vm_ops = { |
54cb8821d mm: merge populat... |
3694 |
.fault = shmem_fault, |
d7c175517 mm: implement ->m... |
3695 |
.map_pages = filemap_map_pages, |
1da177e4c Linux-2.6.12-rc2 |
3696 3697 3698 3699 3700 |
#ifdef CONFIG_NUMA .set_policy = shmem_set_policy, .get_policy = shmem_get_policy, #endif }; |
f32356261 vfs: Convert ramf... |
3701 |
int shmem_init_fs_context(struct fs_context *fc) |
1da177e4c Linux-2.6.12-rc2 |
3702 |
{ |
f32356261 vfs: Convert ramf... |
3703 3704 3705 3706 3707 3708 3709 3710 3711 3712 3713 3714 3715 |
struct shmem_options *ctx; ctx = kzalloc(sizeof(struct shmem_options), GFP_KERNEL); if (!ctx) return -ENOMEM; ctx->mode = 0777 | S_ISVTX; ctx->uid = current_fsuid(); ctx->gid = current_fsgid(); fc->fs_private = ctx; fc->ops = &shmem_fs_context_ops; return 0; |
1da177e4c Linux-2.6.12-rc2 |
3716 |
} |
41ffe5d5c tmpfs: miscellane... |
3717 |
static struct file_system_type shmem_fs_type = { |
1da177e4c Linux-2.6.12-rc2 |
3718 3719 |
.owner = THIS_MODULE, .name = "tmpfs", |
f32356261 vfs: Convert ramf... |
3720 3721 3722 3723 |
.init_fs_context = shmem_init_fs_context, #ifdef CONFIG_TMPFS .parameters = &shmem_fs_parameters, #endif |
1da177e4c Linux-2.6.12-rc2 |
3724 |
.kill_sb = kill_litter_super, |
2b8576cb0 userns: Allow the... |
3725 |
.fs_flags = FS_USERNS_MOUNT, |
1da177e4c Linux-2.6.12-rc2 |
3726 |
}; |
1da177e4c Linux-2.6.12-rc2 |
3727 |
|
41ffe5d5c tmpfs: miscellane... |
3728 |
int __init shmem_init(void) |
1da177e4c Linux-2.6.12-rc2 |
3729 3730 |
{ int error; |
9a8ec03ed shmem: convert sh... |
3731 |
shmem_init_inodecache(); |
1da177e4c Linux-2.6.12-rc2 |
3732 |
|
41ffe5d5c tmpfs: miscellane... |
3733 |
error = register_filesystem(&shmem_fs_type); |
1da177e4c Linux-2.6.12-rc2 |
3734 |
if (error) { |
1170532bb mm: convert print... |
3735 3736 |
pr_err("Could not register tmpfs "); |
1da177e4c Linux-2.6.12-rc2 |
3737 3738 |
goto out2; } |
95dc112a5 [PATCH] devfs: Re... |
3739 |
|
ca4e05195 shm_mnt is as lon... |
3740 |
shm_mnt = kern_mount(&shmem_fs_type); |
1da177e4c Linux-2.6.12-rc2 |
3741 3742 |
if (IS_ERR(shm_mnt)) { error = PTR_ERR(shm_mnt); |
1170532bb mm: convert print... |
3743 3744 |
pr_err("Could not kern_mount tmpfs "); |
1da177e4c Linux-2.6.12-rc2 |
3745 3746 |
goto out1; } |
5a6e75f81 shmem: prepare hu... |
3747 |
|
e496cf3d7 thp: introduce CO... |
3748 |
#ifdef CONFIG_TRANSPARENT_HUGE_PAGECACHE |
435c0b87d mm, shmem: fix ha... |
3749 |
if (has_transparent_hugepage() && shmem_huge > SHMEM_HUGE_DENY) |
5a6e75f81 shmem: prepare hu... |
3750 3751 3752 3753 |
SHMEM_SB(shm_mnt->mnt_sb)->huge = shmem_huge; else shmem_huge = 0; /* just in case it was patched */ #endif |
1da177e4c Linux-2.6.12-rc2 |
3754 3755 3756 |
return 0; out1: |
41ffe5d5c tmpfs: miscellane... |
3757 |
unregister_filesystem(&shmem_fs_type); |
1da177e4c Linux-2.6.12-rc2 |
3758 |
out2: |
41ffe5d5c tmpfs: miscellane... |
3759 |
shmem_destroy_inodecache(); |
1da177e4c Linux-2.6.12-rc2 |
3760 3761 3762 |
shm_mnt = ERR_PTR(error); return error; } |
853ac43ab shmem: unify regu... |
3763 |
|
e496cf3d7 thp: introduce CO... |
3764 |
#if defined(CONFIG_TRANSPARENT_HUGE_PAGECACHE) && defined(CONFIG_SYSFS) |
5a6e75f81 shmem: prepare hu... |
3765 3766 3767 3768 3769 3770 3771 3772 3773 3774 3775 3776 3777 3778 3779 3780 3781 3782 3783 3784 3785 3786 3787 3788 3789 3790 3791 3792 3793 3794 3795 3796 3797 3798 3799 3800 3801 3802 3803 3804 3805 3806 3807 3808 3809 3810 |
static ssize_t shmem_enabled_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { int values[] = { SHMEM_HUGE_ALWAYS, SHMEM_HUGE_WITHIN_SIZE, SHMEM_HUGE_ADVISE, SHMEM_HUGE_NEVER, SHMEM_HUGE_DENY, SHMEM_HUGE_FORCE, }; int i, count; for (i = 0, count = 0; i < ARRAY_SIZE(values); i++) { const char *fmt = shmem_huge == values[i] ? "[%s] " : "%s "; count += sprintf(buf + count, fmt, shmem_format_huge(values[i])); } buf[count - 1] = ' '; return count; } static ssize_t shmem_enabled_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { char tmp[16]; int huge; if (count + 1 > sizeof(tmp)) return -EINVAL; memcpy(tmp, buf, count); tmp[count] = '\0'; if (count && tmp[count - 1] == ' ') tmp[count - 1] = '\0'; huge = shmem_parse_huge(tmp); if (huge == -EINVAL) return -EINVAL; if (!has_transparent_hugepage() && huge != SHMEM_HUGE_NEVER && huge != SHMEM_HUGE_DENY) return -EINVAL; shmem_huge = huge; |
435c0b87d mm, shmem: fix ha... |
3811 |
if (shmem_huge > SHMEM_HUGE_DENY) |
5a6e75f81 shmem: prepare hu... |
3812 3813 3814 3815 3816 3817 |
SHMEM_SB(shm_mnt->mnt_sb)->huge = shmem_huge; return count; } struct kobj_attribute shmem_enabled_attr = __ATTR(shmem_enabled, 0644, shmem_enabled_show, shmem_enabled_store); |
3b33719c9 thp: move shmem_h... |
3818 |
#endif /* CONFIG_TRANSPARENT_HUGE_PAGECACHE && CONFIG_SYSFS */ |
f3f0e1d21 khugepaged: add s... |
3819 |
|
3b33719c9 thp: move shmem_h... |
3820 |
#ifdef CONFIG_TRANSPARENT_HUGE_PAGECACHE |
f3f0e1d21 khugepaged: add s... |
3821 3822 3823 3824 3825 3826 |
bool shmem_huge_enabled(struct vm_area_struct *vma) { struct inode *inode = file_inode(vma->vm_file); struct shmem_sb_info *sbinfo = SHMEM_SB(inode->i_sb); loff_t i_size; pgoff_t off; |
c06306696 mm: thp: fix fals... |
3827 3828 3829 |
if ((vma->vm_flags & VM_NOHUGEPAGE) || test_bit(MMF_DISABLE_THP, &vma->vm_mm->flags)) return false; |
f3f0e1d21 khugepaged: add s... |
3830 3831 3832 3833 3834 3835 3836 3837 3838 3839 3840 3841 3842 3843 3844 |
if (shmem_huge == SHMEM_HUGE_FORCE) return true; if (shmem_huge == SHMEM_HUGE_DENY) return false; switch (sbinfo->huge) { case SHMEM_HUGE_NEVER: return false; case SHMEM_HUGE_ALWAYS: return true; case SHMEM_HUGE_WITHIN_SIZE: off = round_up(vma->vm_pgoff, HPAGE_PMD_NR); i_size = round_up(i_size_read(inode), PAGE_SIZE); if (i_size >= HPAGE_PMD_SIZE && i_size >> PAGE_SHIFT >= off) return true; |
c8402871d mm/shmem.c: mark ... |
3845 |
/* fall through */ |
f3f0e1d21 khugepaged: add s... |
3846 3847 3848 3849 3850 3851 3852 3853 |
case SHMEM_HUGE_ADVISE: /* TODO: implement fadvise() hints */ return (vma->vm_flags & VM_HUGEPAGE); default: VM_BUG_ON(1); return false; } } |
3b33719c9 thp: move shmem_h... |
3854 |
#endif /* CONFIG_TRANSPARENT_HUGE_PAGECACHE */ |
5a6e75f81 shmem: prepare hu... |
3855 |
|
853ac43ab shmem: unify regu... |
3856 3857 3858 3859 3860 3861 3862 3863 3864 3865 |
#else /* !CONFIG_SHMEM */ /* * tiny-shmem: simple shmemfs and tmpfs using ramfs code * * This is intended for small system where the benefits of the full * shmem code (swap-backed and resource-limited) are outweighed by * their complexity. On systems without swap this code should be * effectively equivalent, but much lighter weight. */ |
41ffe5d5c tmpfs: miscellane... |
3866 |
static struct file_system_type shmem_fs_type = { |
853ac43ab shmem: unify regu... |
3867 |
.name = "tmpfs", |
f32356261 vfs: Convert ramf... |
3868 3869 |
.init_fs_context = ramfs_init_fs_context, .parameters = &ramfs_fs_parameters, |
853ac43ab shmem: unify regu... |
3870 |
.kill_sb = kill_litter_super, |
2b8576cb0 userns: Allow the... |
3871 |
.fs_flags = FS_USERNS_MOUNT, |
853ac43ab shmem: unify regu... |
3872 |
}; |
41ffe5d5c tmpfs: miscellane... |
3873 |
int __init shmem_init(void) |
853ac43ab shmem: unify regu... |
3874 |
{ |
41ffe5d5c tmpfs: miscellane... |
3875 |
BUG_ON(register_filesystem(&shmem_fs_type) != 0); |
853ac43ab shmem: unify regu... |
3876 |
|
41ffe5d5c tmpfs: miscellane... |
3877 |
shm_mnt = kern_mount(&shmem_fs_type); |
853ac43ab shmem: unify regu... |
3878 3879 3880 3881 |
BUG_ON(IS_ERR(shm_mnt)); return 0; } |
b56a2d8af mm: rid swapoff o... |
3882 3883 |
int shmem_unuse(unsigned int type, bool frontswap, unsigned long *fs_pages_to_unuse) |
853ac43ab shmem: unify regu... |
3884 3885 3886 |
{ return 0; } |
3f96b79ad tmpfs: depend on ... |
3887 3888 3889 3890 |
int shmem_lock(struct file *file, int lock, struct user_struct *user) { return 0; } |
245132643 SHM_UNLOCK: fix U... |
3891 3892 3893 |
void shmem_unlock_mapping(struct address_space *mapping) { } |
c01d5b300 shmem: get_unmapp... |
3894 3895 3896 3897 3898 3899 3900 3901 |
#ifdef CONFIG_MMU unsigned long shmem_get_unmapped_area(struct file *file, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags) { return current->mm->get_unmapped_area(file, addr, len, pgoff, flags); } #endif |
41ffe5d5c tmpfs: miscellane... |
3902 |
void shmem_truncate_range(struct inode *inode, loff_t lstart, loff_t lend) |
94c1e62df tmpfs: take contr... |
3903 |
{ |
41ffe5d5c tmpfs: miscellane... |
3904 |
truncate_inode_pages_range(inode->i_mapping, lstart, lend); |
94c1e62df tmpfs: take contr... |
3905 3906 |
} EXPORT_SYMBOL_GPL(shmem_truncate_range); |
0b0a0806b shmem: fix shared... |
3907 3908 |
#define shmem_vm_ops generic_file_vm_ops #define shmem_file_operations ramfs_file_operations |
454abafe9 ramfs: replace in... |
3909 |
#define shmem_get_inode(sb, dir, mode, dev, flags) ramfs_get_inode(sb, dir, mode, dev) |
0b0a0806b shmem: fix shared... |
3910 3911 |
#define shmem_acct_size(flags, size) 0 #define shmem_unacct_size(flags, size) do {} while (0) |
853ac43ab shmem: unify regu... |
3912 3913 3914 3915 |
#endif /* CONFIG_SHMEM */ /* common code */ |
1da177e4c Linux-2.6.12-rc2 |
3916 |
|
703321b60 mm/shmem: introdu... |
3917 |
static struct file *__shmem_file_setup(struct vfsmount *mnt, const char *name, loff_t size, |
c72770909 security: shmem: ... |
3918 |
unsigned long flags, unsigned int i_flags) |
1da177e4c Linux-2.6.12-rc2 |
3919 |
{ |
1da177e4c Linux-2.6.12-rc2 |
3920 |
struct inode *inode; |
93dec2da7 ... and switch sh... |
3921 |
struct file *res; |
1da177e4c Linux-2.6.12-rc2 |
3922 |
|
703321b60 mm/shmem: introdu... |
3923 3924 |
if (IS_ERR(mnt)) return ERR_CAST(mnt); |
1da177e4c Linux-2.6.12-rc2 |
3925 |
|
285b2c4fd tmpfs: demolish o... |
3926 |
if (size < 0 || size > MAX_LFS_FILESIZE) |
1da177e4c Linux-2.6.12-rc2 |
3927 3928 3929 3930 |
return ERR_PTR(-EINVAL); if (shmem_acct_size(flags, size)) return ERR_PTR(-ENOMEM); |
93dec2da7 ... and switch sh... |
3931 3932 |
inode = shmem_get_inode(mnt->mnt_sb, NULL, S_IFREG | S_IRWXUGO, 0, flags); |
dac2d1f6c __shmem_file_setu... |
3933 3934 3935 3936 |
if (unlikely(!inode)) { shmem_unacct_size(flags, size); return ERR_PTR(-ENOSPC); } |
c72770909 security: shmem: ... |
3937 |
inode->i_flags |= i_flags; |
1da177e4c Linux-2.6.12-rc2 |
3938 |
inode->i_size = size; |
6d6b77f16 filesystems: add ... |
3939 |
clear_nlink(inode); /* It is unlinked */ |
26567cdbb fix nommu breakag... |
3940 |
res = ERR_PTR(ramfs_nommu_expand_for_mapping(inode, size)); |
93dec2da7 ... and switch sh... |
3941 3942 3943 |
if (!IS_ERR(res)) res = alloc_file_pseudo(inode, mnt, name, O_RDWR, &shmem_file_operations); |
26567cdbb fix nommu breakag... |
3944 |
if (IS_ERR(res)) |
93dec2da7 ... and switch sh... |
3945 |
iput(inode); |
6b4d0b279 clean shmem_file_... |
3946 |
return res; |
1da177e4c Linux-2.6.12-rc2 |
3947 |
} |
c72770909 security: shmem: ... |
3948 3949 3950 3951 3952 |
/** * shmem_kernel_file_setup - get an unlinked file living in tmpfs which must be * kernel internal. There will be NO LSM permission checks against the * underlying inode. So users of this interface must do LSM checks at a |
e1832f292 ipc: use private ... |
3953 3954 |
* higher layer. The users are the big_key and shm implementations. LSM * checks are provided at the key or shm level rather than the inode. |
c72770909 security: shmem: ... |
3955 3956 3957 3958 3959 3960 |
* @name: name for dentry (to be seen in /proc/<pid>/maps * @size: size to be set for the file * @flags: VM_NORESERVE suppresses pre-accounting of the entire object size */ struct file *shmem_kernel_file_setup(const char *name, loff_t size, unsigned long flags) { |
703321b60 mm/shmem: introdu... |
3961 |
return __shmem_file_setup(shm_mnt, name, size, flags, S_PRIVATE); |
c72770909 security: shmem: ... |
3962 3963 3964 3965 3966 3967 3968 3969 3970 3971 |
} /** * shmem_file_setup - get an unlinked file living in tmpfs * @name: name for dentry (to be seen in /proc/<pid>/maps * @size: size to be set for the file * @flags: VM_NORESERVE suppresses pre-accounting of the entire object size */ struct file *shmem_file_setup(const char *name, loff_t size, unsigned long flags) { |
703321b60 mm/shmem: introdu... |
3972 |
return __shmem_file_setup(shm_mnt, name, size, flags, 0); |
c72770909 security: shmem: ... |
3973 |
} |
395e0ddc4 Export shmem_file... |
3974 |
EXPORT_SYMBOL_GPL(shmem_file_setup); |
1da177e4c Linux-2.6.12-rc2 |
3975 |
|
467118102 mm/shmem and tiny... |
3976 |
/** |
703321b60 mm/shmem: introdu... |
3977 3978 3979 3980 3981 3982 3983 3984 3985 3986 3987 3988 3989 3990 |
* shmem_file_setup_with_mnt - get an unlinked file living in tmpfs * @mnt: the tmpfs mount where the file will be created * @name: name for dentry (to be seen in /proc/<pid>/maps * @size: size to be set for the file * @flags: VM_NORESERVE suppresses pre-accounting of the entire object size */ struct file *shmem_file_setup_with_mnt(struct vfsmount *mnt, const char *name, loff_t size, unsigned long flags) { return __shmem_file_setup(mnt, name, size, flags, 0); } EXPORT_SYMBOL_GPL(shmem_file_setup_with_mnt); /** |
1da177e4c Linux-2.6.12-rc2 |
3991 |
* shmem_zero_setup - setup a shared anonymous mapping |
1da177e4c Linux-2.6.12-rc2 |
3992 3993 3994 3995 3996 3997 |
* @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; |
66fc13039 mm: shmem_zero_se... |
3998 3999 4000 4001 4002 4003 |
/* * Cloning a new file under mmap_sem leads to a lock ordering conflict * between XFS directory reading and selinux: since this file is only * accessible to the user through its mapping, use S_PRIVATE flag to * bypass file security, in the same way as shmem_kernel_file_setup(). */ |
703321b60 mm/shmem: introdu... |
4004 |
file = shmem_kernel_file_setup("dev/zero", size, vma->vm_flags); |
1da177e4c Linux-2.6.12-rc2 |
4005 4006 4007 4008 4009 4010 4011 |
if (IS_ERR(file)) return PTR_ERR(file); if (vma->vm_file) fput(vma->vm_file); vma->vm_file = file; vma->vm_ops = &shmem_vm_ops; |
f3f0e1d21 khugepaged: add s... |
4012 |
|
e496cf3d7 thp: introduce CO... |
4013 |
if (IS_ENABLED(CONFIG_TRANSPARENT_HUGE_PAGECACHE) && |
f3f0e1d21 khugepaged: add s... |
4014 4015 4016 4017 |
((vma->vm_start + ~HPAGE_PMD_MASK) & HPAGE_PMD_MASK) < (vma->vm_end & HPAGE_PMD_MASK)) { khugepaged_enter(vma, vma->vm_flags); } |
1da177e4c Linux-2.6.12-rc2 |
4018 4019 |
return 0; } |
d9d90e5eb tmpfs: add shmem_... |
4020 4021 4022 4023 4024 4025 4026 4027 4028 4029 4030 4031 4032 |
/** * 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... |
4033 4034 |
* 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_... |
4035 4036 4037 4038 |
*/ struct page *shmem_read_mapping_page_gfp(struct address_space *mapping, pgoff_t index, gfp_t gfp) { |
68da9f055 tmpfs: pass gfp t... |
4039 4040 |
#ifdef CONFIG_SHMEM struct inode *inode = mapping->host; |
9276aad6c tmpfs: remove_shm... |
4041 |
struct page *page; |
68da9f055 tmpfs: pass gfp t... |
4042 4043 4044 |
int error; BUG_ON(mapping->a_ops != &shmem_aops); |
9e18eb293 tmpfs: mem_cgroup... |
4045 |
error = shmem_getpage_gfp(inode, index, &page, SGP_CACHE, |
cfda05267 userfaultfd: shme... |
4046 |
gfp, NULL, NULL, NULL); |
68da9f055 tmpfs: pass gfp t... |
4047 4048 4049 4050 4051 4052 4053 4054 4055 |
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_... |
4056 |
return read_cache_page_gfp(mapping, index, gfp); |
68da9f055 tmpfs: pass gfp t... |
4057 |
#endif |
d9d90e5eb tmpfs: add shmem_... |
4058 4059 |
} EXPORT_SYMBOL_GPL(shmem_read_mapping_page_gfp); |