| 1 | // SPDX-License-Identifier: GPL-2.0-only |
| 2 | /* |
| 3 | * linux/fs/nfs/inode.c |
| 4 | * |
| 5 | * Copyright (C) 1992 Rick Sladkey |
| 6 | * |
| 7 | * nfs inode and superblock handling functions |
| 8 | * |
| 9 | * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some |
| 10 | * experimental NFS changes. Modularisation taken straight from SYS5 fs. |
| 11 | * |
| 12 | * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts. |
| 13 | * J.S.Peatfield@damtp.cam.ac.uk |
| 14 | * |
| 15 | */ |
| 16 | |
| 17 | #include <linux/module.h> |
| 18 | #include <linux/init.h> |
| 19 | #include <linux/sched/signal.h> |
| 20 | #include <linux/time.h> |
| 21 | #include <linux/kernel.h> |
| 22 | #include <linux/mm.h> |
| 23 | #include <linux/string.h> |
| 24 | #include <linux/stat.h> |
| 25 | #include <linux/errno.h> |
| 26 | #include <linux/unistd.h> |
| 27 | #include <linux/sunrpc/clnt.h> |
| 28 | #include <linux/sunrpc/stats.h> |
| 29 | #include <linux/sunrpc/metrics.h> |
| 30 | #include <linux/nfs_fs.h> |
| 31 | #include <linux/nfs_mount.h> |
| 32 | #include <linux/nfs4_mount.h> |
| 33 | #include <linux/lockd/bind.h> |
| 34 | #include <linux/seq_file.h> |
| 35 | #include <linux/mount.h> |
| 36 | #include <linux/vfs.h> |
| 37 | #include <linux/inet.h> |
| 38 | #include <linux/nfs_xdr.h> |
| 39 | #include <linux/slab.h> |
| 40 | #include <linux/compat.h> |
| 41 | #include <linux/freezer.h> |
| 42 | #include <linux/uaccess.h> |
| 43 | #include <linux/iversion.h> |
| 44 | |
| 45 | #include "nfs4_fs.h" |
| 46 | #include "callback.h" |
| 47 | #include "delegation.h" |
| 48 | #include "iostat.h" |
| 49 | #include "internal.h" |
| 50 | #include "fscache.h" |
| 51 | #include "pnfs.h" |
| 52 | #include "nfs.h" |
| 53 | #include "netns.h" |
| 54 | #include "sysfs.h" |
| 55 | |
| 56 | #include "nfstrace.h" |
| 57 | |
| 58 | #define NFSDBG_FACILITY NFSDBG_VFS |
| 59 | |
| 60 | #define NFS_64_BIT_INODE_NUMBERS_ENABLED 1 |
| 61 | |
| 62 | /* Default is to see 64-bit inode numbers */ |
| 63 | static bool enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED; |
| 64 | |
| 65 | static int nfs_update_inode(struct inode *, struct nfs_fattr *); |
| 66 | |
| 67 | static struct kmem_cache * nfs_inode_cachep; |
| 68 | |
| 69 | static inline unsigned long |
| 70 | nfs_fattr_to_ino_t(struct nfs_fattr *fattr) |
| 71 | { |
| 72 | return nfs_fileid_to_ino_t(fattr->fileid); |
| 73 | } |
| 74 | |
| 75 | int nfs_wait_bit_killable(struct wait_bit_key *key, int mode) |
| 76 | { |
| 77 | schedule(); |
| 78 | if (signal_pending_state(mode, current)) |
| 79 | return -ERESTARTSYS; |
| 80 | return 0; |
| 81 | } |
| 82 | EXPORT_SYMBOL_GPL(nfs_wait_bit_killable); |
| 83 | |
| 84 | /** |
| 85 | * nfs_compat_user_ino64 - returns the user-visible inode number |
| 86 | * @fileid: 64-bit fileid |
| 87 | * |
| 88 | * This function returns a 32-bit inode number if the boot parameter |
| 89 | * nfs.enable_ino64 is zero. |
| 90 | */ |
| 91 | u64 nfs_compat_user_ino64(u64 fileid) |
| 92 | { |
| 93 | #ifdef CONFIG_COMPAT |
| 94 | compat_ulong_t ino; |
| 95 | #else |
| 96 | unsigned long ino; |
| 97 | #endif |
| 98 | |
| 99 | if (enable_ino64) |
| 100 | return fileid; |
| 101 | ino = fileid; |
| 102 | if (sizeof(ino) < sizeof(fileid)) |
| 103 | ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8; |
| 104 | return ino; |
| 105 | } |
| 106 | |
| 107 | int nfs_drop_inode(struct inode *inode) |
| 108 | { |
| 109 | return NFS_STALE(inode) || generic_drop_inode(inode); |
| 110 | } |
| 111 | EXPORT_SYMBOL_GPL(nfs_drop_inode); |
| 112 | |
| 113 | void nfs_clear_inode(struct inode *inode) |
| 114 | { |
| 115 | /* |
| 116 | * The following should never happen... |
| 117 | */ |
| 118 | WARN_ON_ONCE(nfs_have_writebacks(inode)); |
| 119 | WARN_ON_ONCE(!list_empty(&NFS_I(inode)->open_files)); |
| 120 | nfs_zap_acl_cache(inode); |
| 121 | nfs_access_zap_cache(inode); |
| 122 | nfs_fscache_clear_inode(inode); |
| 123 | } |
| 124 | EXPORT_SYMBOL_GPL(nfs_clear_inode); |
| 125 | |
| 126 | void nfs_evict_inode(struct inode *inode) |
| 127 | { |
| 128 | truncate_inode_pages_final(&inode->i_data); |
| 129 | clear_inode(inode); |
| 130 | nfs_clear_inode(inode); |
| 131 | } |
| 132 | |
| 133 | int nfs_sync_inode(struct inode *inode) |
| 134 | { |
| 135 | inode_dio_wait(inode); |
| 136 | return nfs_wb_all(inode); |
| 137 | } |
| 138 | EXPORT_SYMBOL_GPL(nfs_sync_inode); |
| 139 | |
| 140 | /** |
| 141 | * nfs_sync_mapping - helper to flush all mmapped dirty data to disk |
| 142 | * @mapping: pointer to struct address_space |
| 143 | */ |
| 144 | int nfs_sync_mapping(struct address_space *mapping) |
| 145 | { |
| 146 | int ret = 0; |
| 147 | |
| 148 | if (mapping->nrpages != 0) { |
| 149 | unmap_mapping_range(mapping, 0, 0, 0); |
| 150 | ret = nfs_wb_all(mapping->host); |
| 151 | } |
| 152 | return ret; |
| 153 | } |
| 154 | |
| 155 | static int nfs_attribute_timeout(struct inode *inode) |
| 156 | { |
| 157 | struct nfs_inode *nfsi = NFS_I(inode); |
| 158 | |
| 159 | return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo); |
| 160 | } |
| 161 | |
| 162 | static bool nfs_check_cache_flags_invalid(struct inode *inode, |
| 163 | unsigned long flags) |
| 164 | { |
| 165 | unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity); |
| 166 | |
| 167 | return (cache_validity & flags) != 0; |
| 168 | } |
| 169 | |
| 170 | bool nfs_check_cache_invalid(struct inode *inode, unsigned long flags) |
| 171 | { |
| 172 | if (nfs_check_cache_flags_invalid(inode, flags)) |
| 173 | return true; |
| 174 | return nfs_attribute_cache_expired(inode); |
| 175 | } |
| 176 | EXPORT_SYMBOL_GPL(nfs_check_cache_invalid); |
| 177 | |
| 178 | #ifdef CONFIG_NFS_V4_2 |
| 179 | static bool nfs_has_xattr_cache(const struct nfs_inode *nfsi) |
| 180 | { |
| 181 | return nfsi->xattr_cache != NULL; |
| 182 | } |
| 183 | #else |
| 184 | static bool nfs_has_xattr_cache(const struct nfs_inode *nfsi) |
| 185 | { |
| 186 | return false; |
| 187 | } |
| 188 | #endif |
| 189 | |
| 190 | void nfs_set_cache_invalid(struct inode *inode, unsigned long flags) |
| 191 | { |
| 192 | struct nfs_inode *nfsi = NFS_I(inode); |
| 193 | bool have_delegation = NFS_PROTO(inode)->have_delegation(inode, FMODE_READ); |
| 194 | |
| 195 | if (have_delegation) { |
| 196 | if (!(flags & NFS_INO_REVAL_FORCED)) |
| 197 | flags &= ~(NFS_INO_INVALID_MODE | |
| 198 | NFS_INO_INVALID_OTHER | |
| 199 | NFS_INO_INVALID_XATTR); |
| 200 | flags &= ~(NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_SIZE); |
| 201 | } |
| 202 | |
| 203 | if (!nfs_has_xattr_cache(nfsi)) |
| 204 | flags &= ~NFS_INO_INVALID_XATTR; |
| 205 | if (flags & NFS_INO_INVALID_DATA) |
| 206 | nfs_fscache_invalidate(inode, 0); |
| 207 | flags &= ~NFS_INO_REVAL_FORCED; |
| 208 | |
| 209 | nfsi->cache_validity |= flags; |
| 210 | |
| 211 | if (inode->i_mapping->nrpages == 0) { |
| 212 | nfsi->cache_validity &= ~NFS_INO_INVALID_DATA; |
| 213 | nfs_ooo_clear(nfsi); |
| 214 | } else if (nfsi->cache_validity & NFS_INO_INVALID_DATA) { |
| 215 | nfs_ooo_clear(nfsi); |
| 216 | } |
| 217 | trace_nfs_set_cache_invalid(inode, 0); |
| 218 | } |
| 219 | EXPORT_SYMBOL_GPL(nfs_set_cache_invalid); |
| 220 | |
| 221 | /* |
| 222 | * Invalidate the local caches |
| 223 | */ |
| 224 | static void nfs_zap_caches_locked(struct inode *inode) |
| 225 | { |
| 226 | struct nfs_inode *nfsi = NFS_I(inode); |
| 227 | int mode = inode->i_mode; |
| 228 | |
| 229 | nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE); |
| 230 | |
| 231 | nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); |
| 232 | nfsi->attrtimeo_timestamp = jiffies; |
| 233 | |
| 234 | if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) |
| 235 | nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR | |
| 236 | NFS_INO_INVALID_DATA | |
| 237 | NFS_INO_INVALID_ACCESS | |
| 238 | NFS_INO_INVALID_ACL | |
| 239 | NFS_INO_INVALID_XATTR); |
| 240 | else |
| 241 | nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR | |
| 242 | NFS_INO_INVALID_ACCESS | |
| 243 | NFS_INO_INVALID_ACL | |
| 244 | NFS_INO_INVALID_XATTR); |
| 245 | nfs_zap_label_cache_locked(nfsi); |
| 246 | } |
| 247 | |
| 248 | void nfs_zap_caches(struct inode *inode) |
| 249 | { |
| 250 | spin_lock(&inode->i_lock); |
| 251 | nfs_zap_caches_locked(inode); |
| 252 | spin_unlock(&inode->i_lock); |
| 253 | } |
| 254 | |
| 255 | void nfs_zap_mapping(struct inode *inode, struct address_space *mapping) |
| 256 | { |
| 257 | if (mapping->nrpages != 0) { |
| 258 | spin_lock(&inode->i_lock); |
| 259 | nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA); |
| 260 | spin_unlock(&inode->i_lock); |
| 261 | } |
| 262 | } |
| 263 | |
| 264 | void nfs_zap_acl_cache(struct inode *inode) |
| 265 | { |
| 266 | void (*clear_acl_cache)(struct inode *); |
| 267 | |
| 268 | clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache; |
| 269 | if (clear_acl_cache != NULL) |
| 270 | clear_acl_cache(inode); |
| 271 | spin_lock(&inode->i_lock); |
| 272 | NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL; |
| 273 | spin_unlock(&inode->i_lock); |
| 274 | } |
| 275 | EXPORT_SYMBOL_GPL(nfs_zap_acl_cache); |
| 276 | |
| 277 | void nfs_invalidate_atime(struct inode *inode) |
| 278 | { |
| 279 | spin_lock(&inode->i_lock); |
| 280 | nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME); |
| 281 | spin_unlock(&inode->i_lock); |
| 282 | } |
| 283 | EXPORT_SYMBOL_GPL(nfs_invalidate_atime); |
| 284 | |
| 285 | /* |
| 286 | * Invalidate, but do not unhash, the inode. |
| 287 | * NB: must be called with inode->i_lock held! |
| 288 | */ |
| 289 | static void nfs_set_inode_stale_locked(struct inode *inode) |
| 290 | { |
| 291 | set_bit(NFS_INO_STALE, &NFS_I(inode)->flags); |
| 292 | nfs_zap_caches_locked(inode); |
| 293 | trace_nfs_set_inode_stale(inode); |
| 294 | } |
| 295 | |
| 296 | void nfs_set_inode_stale(struct inode *inode) |
| 297 | { |
| 298 | spin_lock(&inode->i_lock); |
| 299 | nfs_set_inode_stale_locked(inode); |
| 300 | spin_unlock(&inode->i_lock); |
| 301 | } |
| 302 | |
| 303 | struct nfs_find_desc { |
| 304 | struct nfs_fh *fh; |
| 305 | struct nfs_fattr *fattr; |
| 306 | }; |
| 307 | |
| 308 | /* |
| 309 | * In NFSv3 we can have 64bit inode numbers. In order to support |
| 310 | * this, and re-exported directories (also seen in NFSv2) |
| 311 | * we are forced to allow 2 different inodes to have the same |
| 312 | * i_ino. |
| 313 | */ |
| 314 | static int |
| 315 | nfs_find_actor(struct inode *inode, void *opaque) |
| 316 | { |
| 317 | struct nfs_find_desc *desc = opaque; |
| 318 | struct nfs_fh *fh = desc->fh; |
| 319 | struct nfs_fattr *fattr = desc->fattr; |
| 320 | |
| 321 | if (NFS_FILEID(inode) != fattr->fileid) |
| 322 | return 0; |
| 323 | if (inode_wrong_type(inode, fattr->mode)) |
| 324 | return 0; |
| 325 | if (nfs_compare_fh(NFS_FH(inode), fh)) |
| 326 | return 0; |
| 327 | if (is_bad_inode(inode) || NFS_STALE(inode)) |
| 328 | return 0; |
| 329 | return 1; |
| 330 | } |
| 331 | |
| 332 | static int |
| 333 | nfs_init_locked(struct inode *inode, void *opaque) |
| 334 | { |
| 335 | struct nfs_find_desc *desc = opaque; |
| 336 | struct nfs_fattr *fattr = desc->fattr; |
| 337 | |
| 338 | set_nfs_fileid(inode, fattr->fileid); |
| 339 | inode->i_mode = fattr->mode; |
| 340 | nfs_copy_fh(NFS_FH(inode), desc->fh); |
| 341 | return 0; |
| 342 | } |
| 343 | |
| 344 | #ifdef CONFIG_NFS_V4_SECURITY_LABEL |
| 345 | static void nfs_clear_label_invalid(struct inode *inode) |
| 346 | { |
| 347 | spin_lock(&inode->i_lock); |
| 348 | NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL; |
| 349 | spin_unlock(&inode->i_lock); |
| 350 | } |
| 351 | |
| 352 | void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr) |
| 353 | { |
| 354 | int error; |
| 355 | |
| 356 | if (fattr->label == NULL) |
| 357 | return; |
| 358 | |
| 359 | if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) { |
| 360 | error = security_inode_notifysecctx(inode, fattr->label->label, |
| 361 | fattr->label->len); |
| 362 | if (error) |
| 363 | printk(KERN_ERR "%s() %s %d " |
| 364 | "security_inode_notifysecctx() %d\n", |
| 365 | __func__, |
| 366 | (char *)fattr->label->label, |
| 367 | fattr->label->len, error); |
| 368 | nfs_clear_label_invalid(inode); |
| 369 | } |
| 370 | } |
| 371 | |
| 372 | struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags) |
| 373 | { |
| 374 | struct nfs4_label *label; |
| 375 | |
| 376 | if (!(server->caps & NFS_CAP_SECURITY_LABEL)) |
| 377 | return NULL; |
| 378 | |
| 379 | label = kzalloc(sizeof(struct nfs4_label), flags); |
| 380 | if (label == NULL) |
| 381 | return ERR_PTR(-ENOMEM); |
| 382 | |
| 383 | label->label = kzalloc(NFS4_MAXLABELLEN, flags); |
| 384 | if (label->label == NULL) { |
| 385 | kfree(label); |
| 386 | return ERR_PTR(-ENOMEM); |
| 387 | } |
| 388 | label->len = NFS4_MAXLABELLEN; |
| 389 | |
| 390 | return label; |
| 391 | } |
| 392 | EXPORT_SYMBOL_GPL(nfs4_label_alloc); |
| 393 | #else |
| 394 | void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr) |
| 395 | { |
| 396 | } |
| 397 | #endif |
| 398 | EXPORT_SYMBOL_GPL(nfs_setsecurity); |
| 399 | |
| 400 | /* Search for inode identified by fh, fileid and i_mode in inode cache. */ |
| 401 | struct inode * |
| 402 | nfs_ilookup(struct super_block *sb, struct nfs_fattr *fattr, struct nfs_fh *fh) |
| 403 | { |
| 404 | struct nfs_find_desc desc = { |
| 405 | .fh = fh, |
| 406 | .fattr = fattr, |
| 407 | }; |
| 408 | struct inode *inode; |
| 409 | unsigned long hash; |
| 410 | |
| 411 | if (!(fattr->valid & NFS_ATTR_FATTR_FILEID) || |
| 412 | !(fattr->valid & NFS_ATTR_FATTR_TYPE)) |
| 413 | return NULL; |
| 414 | |
| 415 | hash = nfs_fattr_to_ino_t(fattr); |
| 416 | inode = ilookup5(sb, hash, nfs_find_actor, &desc); |
| 417 | |
| 418 | dprintk("%s: returning %p\n", __func__, inode); |
| 419 | return inode; |
| 420 | } |
| 421 | |
| 422 | static void nfs_inode_init_regular(struct nfs_inode *nfsi) |
| 423 | { |
| 424 | atomic_long_set(&nfsi->nrequests, 0); |
| 425 | atomic_long_set(&nfsi->redirtied_pages, 0); |
| 426 | INIT_LIST_HEAD(&nfsi->commit_info.list); |
| 427 | atomic_long_set(&nfsi->commit_info.ncommit, 0); |
| 428 | atomic_set(&nfsi->commit_info.rpcs_out, 0); |
| 429 | mutex_init(&nfsi->commit_mutex); |
| 430 | } |
| 431 | |
| 432 | static void nfs_inode_init_dir(struct nfs_inode *nfsi) |
| 433 | { |
| 434 | nfsi->cache_change_attribute = 0; |
| 435 | memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf)); |
| 436 | init_rwsem(&nfsi->rmdir_sem); |
| 437 | } |
| 438 | |
| 439 | /* |
| 440 | * This is our front-end to iget that looks up inodes by file handle |
| 441 | * instead of inode number. |
| 442 | */ |
| 443 | struct inode * |
| 444 | nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr) |
| 445 | { |
| 446 | struct nfs_find_desc desc = { |
| 447 | .fh = fh, |
| 448 | .fattr = fattr |
| 449 | }; |
| 450 | struct inode *inode = ERR_PTR(-ENOENT); |
| 451 | u64 fattr_supported = NFS_SB(sb)->fattr_valid; |
| 452 | unsigned long hash; |
| 453 | |
| 454 | nfs_attr_check_mountpoint(sb, fattr); |
| 455 | |
| 456 | if (nfs_attr_use_mounted_on_fileid(fattr)) |
| 457 | fattr->fileid = fattr->mounted_on_fileid; |
| 458 | else if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0) |
| 459 | goto out_no_inode; |
| 460 | if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0) |
| 461 | goto out_no_inode; |
| 462 | |
| 463 | hash = nfs_fattr_to_ino_t(fattr); |
| 464 | |
| 465 | inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc); |
| 466 | if (inode == NULL) { |
| 467 | inode = ERR_PTR(-ENOMEM); |
| 468 | goto out_no_inode; |
| 469 | } |
| 470 | |
| 471 | if (inode->i_state & I_NEW) { |
| 472 | struct nfs_inode *nfsi = NFS_I(inode); |
| 473 | unsigned long now = jiffies; |
| 474 | |
| 475 | /* We set i_ino for the few things that still rely on it, |
| 476 | * such as stat(2) */ |
| 477 | inode->i_ino = hash; |
| 478 | |
| 479 | /* We can't support update_atime(), since the server will reset it */ |
| 480 | inode->i_flags |= S_NOATIME|S_NOCMTIME; |
| 481 | inode->i_mode = fattr->mode; |
| 482 | nfsi->cache_validity = 0; |
| 483 | if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0 |
| 484 | && (fattr_supported & NFS_ATTR_FATTR_MODE)) |
| 485 | nfs_set_cache_invalid(inode, NFS_INO_INVALID_MODE); |
| 486 | /* Why so? Because we want revalidate for devices/FIFOs, and |
| 487 | * that's precisely what we have in nfs_file_inode_operations. |
| 488 | */ |
| 489 | inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops; |
| 490 | if (S_ISREG(inode->i_mode)) { |
| 491 | inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops; |
| 492 | inode->i_data.a_ops = &nfs_file_aops; |
| 493 | nfs_inode_init_regular(nfsi); |
| 494 | } else if (S_ISDIR(inode->i_mode)) { |
| 495 | inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops; |
| 496 | inode->i_fop = &nfs_dir_operations; |
| 497 | inode->i_data.a_ops = &nfs_dir_aops; |
| 498 | nfs_inode_init_dir(nfsi); |
| 499 | /* Deal with crossing mountpoints */ |
| 500 | if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT || |
| 501 | fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) { |
| 502 | if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) |
| 503 | inode->i_op = &nfs_referral_inode_operations; |
| 504 | else |
| 505 | inode->i_op = &nfs_mountpoint_inode_operations; |
| 506 | inode->i_fop = NULL; |
| 507 | inode->i_flags |= S_AUTOMOUNT; |
| 508 | } |
| 509 | } else if (S_ISLNK(inode->i_mode)) { |
| 510 | inode->i_op = &nfs_symlink_inode_operations; |
| 511 | inode_nohighmem(inode); |
| 512 | } else |
| 513 | init_special_inode(inode, inode->i_mode, fattr->rdev); |
| 514 | |
| 515 | inode_set_atime(inode, 0, 0); |
| 516 | inode_set_mtime(inode, 0, 0); |
| 517 | inode_set_ctime(inode, 0, 0); |
| 518 | inode_set_iversion_raw(inode, 0); |
| 519 | inode->i_size = 0; |
| 520 | clear_nlink(inode); |
| 521 | inode->i_uid = make_kuid(&init_user_ns, -2); |
| 522 | inode->i_gid = make_kgid(&init_user_ns, -2); |
| 523 | inode->i_blocks = 0; |
| 524 | nfsi->write_io = 0; |
| 525 | nfsi->read_io = 0; |
| 526 | |
| 527 | nfsi->read_cache_jiffies = fattr->time_start; |
| 528 | nfsi->attr_gencount = fattr->gencount; |
| 529 | if (fattr->valid & NFS_ATTR_FATTR_ATIME) |
| 530 | inode_set_atime_to_ts(inode, fattr->atime); |
| 531 | else if (fattr_supported & NFS_ATTR_FATTR_ATIME) |
| 532 | nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME); |
| 533 | if (fattr->valid & NFS_ATTR_FATTR_MTIME) |
| 534 | inode_set_mtime_to_ts(inode, fattr->mtime); |
| 535 | else if (fattr_supported & NFS_ATTR_FATTR_MTIME) |
| 536 | nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME); |
| 537 | if (fattr->valid & NFS_ATTR_FATTR_CTIME) |
| 538 | inode_set_ctime_to_ts(inode, fattr->ctime); |
| 539 | else if (fattr_supported & NFS_ATTR_FATTR_CTIME) |
| 540 | nfs_set_cache_invalid(inode, NFS_INO_INVALID_CTIME); |
| 541 | if (fattr->valid & NFS_ATTR_FATTR_CHANGE) |
| 542 | inode_set_iversion_raw(inode, fattr->change_attr); |
| 543 | else |
| 544 | nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE); |
| 545 | if (fattr->valid & NFS_ATTR_FATTR_SIZE) |
| 546 | inode->i_size = nfs_size_to_loff_t(fattr->size); |
| 547 | else |
| 548 | nfs_set_cache_invalid(inode, NFS_INO_INVALID_SIZE); |
| 549 | if (fattr->valid & NFS_ATTR_FATTR_NLINK) |
| 550 | set_nlink(inode, fattr->nlink); |
| 551 | else if (fattr_supported & NFS_ATTR_FATTR_NLINK) |
| 552 | nfs_set_cache_invalid(inode, NFS_INO_INVALID_NLINK); |
| 553 | if (fattr->valid & NFS_ATTR_FATTR_OWNER) |
| 554 | inode->i_uid = fattr->uid; |
| 555 | else if (fattr_supported & NFS_ATTR_FATTR_OWNER) |
| 556 | nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER); |
| 557 | if (fattr->valid & NFS_ATTR_FATTR_GROUP) |
| 558 | inode->i_gid = fattr->gid; |
| 559 | else if (fattr_supported & NFS_ATTR_FATTR_GROUP) |
| 560 | nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER); |
| 561 | if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED) |
| 562 | inode->i_blocks = fattr->du.nfs2.blocks; |
| 563 | else if (fattr_supported & NFS_ATTR_FATTR_BLOCKS_USED && |
| 564 | fattr->size != 0) |
| 565 | nfs_set_cache_invalid(inode, NFS_INO_INVALID_BLOCKS); |
| 566 | if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) { |
| 567 | /* |
| 568 | * report the blocks in 512byte units |
| 569 | */ |
| 570 | inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used); |
| 571 | } else if (fattr_supported & NFS_ATTR_FATTR_SPACE_USED && |
| 572 | fattr->size != 0) |
| 573 | nfs_set_cache_invalid(inode, NFS_INO_INVALID_BLOCKS); |
| 574 | |
| 575 | nfs_setsecurity(inode, fattr); |
| 576 | |
| 577 | nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); |
| 578 | nfsi->attrtimeo_timestamp = now; |
| 579 | nfsi->access_cache = RB_ROOT; |
| 580 | |
| 581 | nfs_fscache_init_inode(inode); |
| 582 | |
| 583 | unlock_new_inode(inode); |
| 584 | } else { |
| 585 | int err = nfs_refresh_inode(inode, fattr); |
| 586 | if (err < 0) { |
| 587 | iput(inode); |
| 588 | inode = ERR_PTR(err); |
| 589 | goto out_no_inode; |
| 590 | } |
| 591 | } |
| 592 | dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n", |
| 593 | inode->i_sb->s_id, |
| 594 | (unsigned long long)NFS_FILEID(inode), |
| 595 | nfs_display_fhandle_hash(fh), |
| 596 | atomic_read(&inode->i_count)); |
| 597 | |
| 598 | out: |
| 599 | return inode; |
| 600 | |
| 601 | out_no_inode: |
| 602 | dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode)); |
| 603 | goto out; |
| 604 | } |
| 605 | EXPORT_SYMBOL_GPL(nfs_fhget); |
| 606 | |
| 607 | #define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET|ATTR_FILE|ATTR_OPEN) |
| 608 | |
| 609 | int |
| 610 | nfs_setattr(struct mnt_idmap *idmap, struct dentry *dentry, |
| 611 | struct iattr *attr) |
| 612 | { |
| 613 | struct inode *inode = d_inode(dentry); |
| 614 | struct nfs_fattr *fattr; |
| 615 | int error = 0; |
| 616 | |
| 617 | nfs_inc_stats(inode, NFSIOS_VFSSETATTR); |
| 618 | |
| 619 | /* skip mode change if it's just for clearing setuid/setgid */ |
| 620 | if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) |
| 621 | attr->ia_valid &= ~ATTR_MODE; |
| 622 | |
| 623 | if (attr->ia_valid & ATTR_SIZE) { |
| 624 | BUG_ON(!S_ISREG(inode->i_mode)); |
| 625 | |
| 626 | error = inode_newsize_ok(inode, attr->ia_size); |
| 627 | if (error) |
| 628 | return error; |
| 629 | |
| 630 | if (attr->ia_size == i_size_read(inode)) |
| 631 | attr->ia_valid &= ~ATTR_SIZE; |
| 632 | } |
| 633 | |
| 634 | /* Optimization: if the end result is no change, don't RPC */ |
| 635 | if (((attr->ia_valid & NFS_VALID_ATTRS) & ~(ATTR_FILE|ATTR_OPEN)) == 0) |
| 636 | return 0; |
| 637 | |
| 638 | trace_nfs_setattr_enter(inode); |
| 639 | |
| 640 | /* Write all dirty data */ |
| 641 | if (S_ISREG(inode->i_mode)) |
| 642 | nfs_sync_inode(inode); |
| 643 | |
| 644 | fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode)); |
| 645 | if (fattr == NULL) { |
| 646 | error = -ENOMEM; |
| 647 | goto out; |
| 648 | } |
| 649 | |
| 650 | error = NFS_PROTO(inode)->setattr(dentry, fattr, attr); |
| 651 | if (error == 0) |
| 652 | error = nfs_refresh_inode(inode, fattr); |
| 653 | nfs_free_fattr(fattr); |
| 654 | out: |
| 655 | trace_nfs_setattr_exit(inode, error); |
| 656 | return error; |
| 657 | } |
| 658 | EXPORT_SYMBOL_GPL(nfs_setattr); |
| 659 | |
| 660 | /** |
| 661 | * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall |
| 662 | * @inode: inode of the file used |
| 663 | * @offset: file offset to start truncating |
| 664 | * |
| 665 | * This is a copy of the common vmtruncate, but with the locking |
| 666 | * corrected to take into account the fact that NFS requires |
| 667 | * inode->i_size to be updated under the inode->i_lock. |
| 668 | * Note: must be called with inode->i_lock held! |
| 669 | */ |
| 670 | static int nfs_vmtruncate(struct inode * inode, loff_t offset) |
| 671 | { |
| 672 | int err; |
| 673 | |
| 674 | err = inode_newsize_ok(inode, offset); |
| 675 | if (err) |
| 676 | goto out; |
| 677 | |
| 678 | trace_nfs_size_truncate(inode, offset); |
| 679 | i_size_write(inode, offset); |
| 680 | /* Optimisation */ |
| 681 | if (offset == 0) { |
| 682 | NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_DATA; |
| 683 | nfs_ooo_clear(NFS_I(inode)); |
| 684 | } |
| 685 | NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_SIZE; |
| 686 | |
| 687 | spin_unlock(&inode->i_lock); |
| 688 | truncate_pagecache(inode, offset); |
| 689 | spin_lock(&inode->i_lock); |
| 690 | out: |
| 691 | return err; |
| 692 | } |
| 693 | |
| 694 | /** |
| 695 | * nfs_setattr_update_inode - Update inode metadata after a setattr call. |
| 696 | * @inode: pointer to struct inode |
| 697 | * @attr: pointer to struct iattr |
| 698 | * @fattr: pointer to struct nfs_fattr |
| 699 | * |
| 700 | * Note: we do this in the *proc.c in order to ensure that |
| 701 | * it works for things like exclusive creates too. |
| 702 | */ |
| 703 | void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr, |
| 704 | struct nfs_fattr *fattr) |
| 705 | { |
| 706 | /* Barrier: bump the attribute generation count. */ |
| 707 | nfs_fattr_set_barrier(fattr); |
| 708 | |
| 709 | spin_lock(&inode->i_lock); |
| 710 | NFS_I(inode)->attr_gencount = fattr->gencount; |
| 711 | if ((attr->ia_valid & ATTR_SIZE) != 0) { |
| 712 | nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME | |
| 713 | NFS_INO_INVALID_BLOCKS); |
| 714 | nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC); |
| 715 | nfs_vmtruncate(inode, attr->ia_size); |
| 716 | } |
| 717 | if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) { |
| 718 | NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_CTIME; |
| 719 | if ((attr->ia_valid & ATTR_KILL_SUID) != 0 && |
| 720 | inode->i_mode & S_ISUID) |
| 721 | inode->i_mode &= ~S_ISUID; |
| 722 | if (setattr_should_drop_sgid(&nop_mnt_idmap, inode)) |
| 723 | inode->i_mode &= ~S_ISGID; |
| 724 | if ((attr->ia_valid & ATTR_MODE) != 0) { |
| 725 | int mode = attr->ia_mode & S_IALLUGO; |
| 726 | mode |= inode->i_mode & ~S_IALLUGO; |
| 727 | inode->i_mode = mode; |
| 728 | } |
| 729 | if ((attr->ia_valid & ATTR_UID) != 0) |
| 730 | inode->i_uid = attr->ia_uid; |
| 731 | if ((attr->ia_valid & ATTR_GID) != 0) |
| 732 | inode->i_gid = attr->ia_gid; |
| 733 | if (fattr->valid & NFS_ATTR_FATTR_CTIME) |
| 734 | inode_set_ctime_to_ts(inode, fattr->ctime); |
| 735 | else |
| 736 | nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
| 737 | | NFS_INO_INVALID_CTIME); |
| 738 | nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS |
| 739 | | NFS_INO_INVALID_ACL); |
| 740 | } |
| 741 | if (attr->ia_valid & (ATTR_ATIME_SET|ATTR_ATIME)) { |
| 742 | NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_ATIME |
| 743 | | NFS_INO_INVALID_CTIME); |
| 744 | if (fattr->valid & NFS_ATTR_FATTR_ATIME) |
| 745 | inode_set_atime_to_ts(inode, fattr->atime); |
| 746 | else if (attr->ia_valid & ATTR_ATIME_SET) |
| 747 | inode_set_atime_to_ts(inode, attr->ia_atime); |
| 748 | else |
| 749 | nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME); |
| 750 | |
| 751 | if (fattr->valid & NFS_ATTR_FATTR_CTIME) |
| 752 | inode_set_ctime_to_ts(inode, fattr->ctime); |
| 753 | else |
| 754 | nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
| 755 | | NFS_INO_INVALID_CTIME); |
| 756 | } |
| 757 | if (attr->ia_valid & (ATTR_MTIME_SET|ATTR_MTIME)) { |
| 758 | NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_MTIME |
| 759 | | NFS_INO_INVALID_CTIME); |
| 760 | if (fattr->valid & NFS_ATTR_FATTR_MTIME) |
| 761 | inode_set_mtime_to_ts(inode, fattr->mtime); |
| 762 | else if (attr->ia_valid & ATTR_MTIME_SET) |
| 763 | inode_set_mtime_to_ts(inode, attr->ia_mtime); |
| 764 | else |
| 765 | nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME); |
| 766 | |
| 767 | if (fattr->valid & NFS_ATTR_FATTR_CTIME) |
| 768 | inode_set_ctime_to_ts(inode, fattr->ctime); |
| 769 | else |
| 770 | nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
| 771 | | NFS_INO_INVALID_CTIME); |
| 772 | } |
| 773 | if (fattr->valid) |
| 774 | nfs_update_inode(inode, fattr); |
| 775 | spin_unlock(&inode->i_lock); |
| 776 | } |
| 777 | EXPORT_SYMBOL_GPL(nfs_setattr_update_inode); |
| 778 | |
| 779 | /* |
| 780 | * Don't request help from readdirplus if the file is being written to, |
| 781 | * or if attribute caching is turned off |
| 782 | */ |
| 783 | static bool nfs_getattr_readdirplus_enable(const struct inode *inode) |
| 784 | { |
| 785 | return nfs_server_capable(inode, NFS_CAP_READDIRPLUS) && |
| 786 | !nfs_have_writebacks(inode) && NFS_MAXATTRTIMEO(inode) > 5 * HZ; |
| 787 | } |
| 788 | |
| 789 | static void nfs_readdirplus_parent_cache_miss(struct dentry *dentry) |
| 790 | { |
| 791 | if (!IS_ROOT(dentry)) { |
| 792 | struct dentry *parent = dget_parent(dentry); |
| 793 | nfs_readdir_record_entry_cache_miss(d_inode(parent)); |
| 794 | dput(parent); |
| 795 | } |
| 796 | } |
| 797 | |
| 798 | static void nfs_readdirplus_parent_cache_hit(struct dentry *dentry) |
| 799 | { |
| 800 | if (!IS_ROOT(dentry)) { |
| 801 | struct dentry *parent = dget_parent(dentry); |
| 802 | nfs_readdir_record_entry_cache_hit(d_inode(parent)); |
| 803 | dput(parent); |
| 804 | } |
| 805 | } |
| 806 | |
| 807 | static u32 nfs_get_valid_attrmask(struct inode *inode) |
| 808 | { |
| 809 | unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity); |
| 810 | u32 reply_mask = STATX_INO | STATX_TYPE; |
| 811 | |
| 812 | if (!(cache_validity & NFS_INO_INVALID_ATIME)) |
| 813 | reply_mask |= STATX_ATIME; |
| 814 | if (!(cache_validity & NFS_INO_INVALID_CTIME)) |
| 815 | reply_mask |= STATX_CTIME; |
| 816 | if (!(cache_validity & NFS_INO_INVALID_MTIME)) |
| 817 | reply_mask |= STATX_MTIME; |
| 818 | if (!(cache_validity & NFS_INO_INVALID_SIZE)) |
| 819 | reply_mask |= STATX_SIZE; |
| 820 | if (!(cache_validity & NFS_INO_INVALID_NLINK)) |
| 821 | reply_mask |= STATX_NLINK; |
| 822 | if (!(cache_validity & NFS_INO_INVALID_MODE)) |
| 823 | reply_mask |= STATX_MODE; |
| 824 | if (!(cache_validity & NFS_INO_INVALID_OTHER)) |
| 825 | reply_mask |= STATX_UID | STATX_GID; |
| 826 | if (!(cache_validity & NFS_INO_INVALID_BLOCKS)) |
| 827 | reply_mask |= STATX_BLOCKS; |
| 828 | if (!(cache_validity & NFS_INO_INVALID_CHANGE)) |
| 829 | reply_mask |= STATX_CHANGE_COOKIE; |
| 830 | return reply_mask; |
| 831 | } |
| 832 | |
| 833 | int nfs_getattr(struct mnt_idmap *idmap, const struct path *path, |
| 834 | struct kstat *stat, u32 request_mask, unsigned int query_flags) |
| 835 | { |
| 836 | struct inode *inode = d_inode(path->dentry); |
| 837 | struct nfs_server *server = NFS_SERVER(inode); |
| 838 | unsigned long cache_validity; |
| 839 | int err = 0; |
| 840 | bool force_sync = query_flags & AT_STATX_FORCE_SYNC; |
| 841 | bool do_update = false; |
| 842 | bool readdirplus_enabled = nfs_getattr_readdirplus_enable(inode); |
| 843 | |
| 844 | trace_nfs_getattr_enter(inode); |
| 845 | |
| 846 | request_mask &= STATX_TYPE | STATX_MODE | STATX_NLINK | STATX_UID | |
| 847 | STATX_GID | STATX_ATIME | STATX_MTIME | STATX_CTIME | |
| 848 | STATX_INO | STATX_SIZE | STATX_BLOCKS | |
| 849 | STATX_CHANGE_COOKIE; |
| 850 | |
| 851 | if ((query_flags & AT_STATX_DONT_SYNC) && !force_sync) { |
| 852 | if (readdirplus_enabled) |
| 853 | nfs_readdirplus_parent_cache_hit(path->dentry); |
| 854 | goto out_no_revalidate; |
| 855 | } |
| 856 | |
| 857 | /* Flush out writes to the server in order to update c/mtime/version. */ |
| 858 | if ((request_mask & (STATX_CTIME | STATX_MTIME | STATX_CHANGE_COOKIE)) && |
| 859 | S_ISREG(inode->i_mode)) |
| 860 | filemap_write_and_wait(inode->i_mapping); |
| 861 | |
| 862 | /* |
| 863 | * We may force a getattr if the user cares about atime. |
| 864 | * |
| 865 | * Note that we only have to check the vfsmount flags here: |
| 866 | * - NFS always sets S_NOATIME by so checking it would give a |
| 867 | * bogus result |
| 868 | * - NFS never sets SB_NOATIME or SB_NODIRATIME so there is |
| 869 | * no point in checking those. |
| 870 | */ |
| 871 | if ((path->mnt->mnt_flags & MNT_NOATIME) || |
| 872 | ((path->mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode))) |
| 873 | request_mask &= ~STATX_ATIME; |
| 874 | |
| 875 | /* Is the user requesting attributes that might need revalidation? */ |
| 876 | if (!(request_mask & (STATX_MODE|STATX_NLINK|STATX_ATIME|STATX_CTIME| |
| 877 | STATX_MTIME|STATX_UID|STATX_GID| |
| 878 | STATX_SIZE|STATX_BLOCKS| |
| 879 | STATX_CHANGE_COOKIE))) |
| 880 | goto out_no_revalidate; |
| 881 | |
| 882 | /* Check whether the cached attributes are stale */ |
| 883 | do_update |= force_sync || nfs_attribute_cache_expired(inode); |
| 884 | cache_validity = READ_ONCE(NFS_I(inode)->cache_validity); |
| 885 | do_update |= cache_validity & NFS_INO_INVALID_CHANGE; |
| 886 | if (request_mask & STATX_ATIME) |
| 887 | do_update |= cache_validity & NFS_INO_INVALID_ATIME; |
| 888 | if (request_mask & STATX_CTIME) |
| 889 | do_update |= cache_validity & NFS_INO_INVALID_CTIME; |
| 890 | if (request_mask & STATX_MTIME) |
| 891 | do_update |= cache_validity & NFS_INO_INVALID_MTIME; |
| 892 | if (request_mask & STATX_SIZE) |
| 893 | do_update |= cache_validity & NFS_INO_INVALID_SIZE; |
| 894 | if (request_mask & STATX_NLINK) |
| 895 | do_update |= cache_validity & NFS_INO_INVALID_NLINK; |
| 896 | if (request_mask & STATX_MODE) |
| 897 | do_update |= cache_validity & NFS_INO_INVALID_MODE; |
| 898 | if (request_mask & (STATX_UID | STATX_GID)) |
| 899 | do_update |= cache_validity & NFS_INO_INVALID_OTHER; |
| 900 | if (request_mask & STATX_BLOCKS) |
| 901 | do_update |= cache_validity & NFS_INO_INVALID_BLOCKS; |
| 902 | |
| 903 | if (do_update) { |
| 904 | if (readdirplus_enabled) |
| 905 | nfs_readdirplus_parent_cache_miss(path->dentry); |
| 906 | err = __nfs_revalidate_inode(server, inode); |
| 907 | if (err) |
| 908 | goto out; |
| 909 | } else if (readdirplus_enabled) |
| 910 | nfs_readdirplus_parent_cache_hit(path->dentry); |
| 911 | out_no_revalidate: |
| 912 | /* Only return attributes that were revalidated. */ |
| 913 | stat->result_mask = nfs_get_valid_attrmask(inode) | request_mask; |
| 914 | |
| 915 | generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat); |
| 916 | stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode)); |
| 917 | stat->change_cookie = inode_peek_iversion_raw(inode); |
| 918 | stat->attributes_mask |= STATX_ATTR_CHANGE_MONOTONIC; |
| 919 | if (server->change_attr_type != NFS4_CHANGE_TYPE_IS_UNDEFINED) |
| 920 | stat->attributes |= STATX_ATTR_CHANGE_MONOTONIC; |
| 921 | if (S_ISDIR(inode->i_mode)) |
| 922 | stat->blksize = NFS_SERVER(inode)->dtsize; |
| 923 | out: |
| 924 | trace_nfs_getattr_exit(inode, err); |
| 925 | return err; |
| 926 | } |
| 927 | EXPORT_SYMBOL_GPL(nfs_getattr); |
| 928 | |
| 929 | static void nfs_init_lock_context(struct nfs_lock_context *l_ctx) |
| 930 | { |
| 931 | refcount_set(&l_ctx->count, 1); |
| 932 | l_ctx->lockowner = current->files; |
| 933 | INIT_LIST_HEAD(&l_ctx->list); |
| 934 | atomic_set(&l_ctx->io_count, 0); |
| 935 | } |
| 936 | |
| 937 | static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx) |
| 938 | { |
| 939 | struct nfs_lock_context *pos; |
| 940 | |
| 941 | list_for_each_entry_rcu(pos, &ctx->lock_context.list, list) { |
| 942 | if (pos->lockowner != current->files) |
| 943 | continue; |
| 944 | if (refcount_inc_not_zero(&pos->count)) |
| 945 | return pos; |
| 946 | } |
| 947 | return NULL; |
| 948 | } |
| 949 | |
| 950 | struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx) |
| 951 | { |
| 952 | struct nfs_lock_context *res, *new = NULL; |
| 953 | struct inode *inode = d_inode(ctx->dentry); |
| 954 | |
| 955 | rcu_read_lock(); |
| 956 | res = __nfs_find_lock_context(ctx); |
| 957 | rcu_read_unlock(); |
| 958 | if (res == NULL) { |
| 959 | new = kmalloc(sizeof(*new), GFP_KERNEL_ACCOUNT); |
| 960 | if (new == NULL) |
| 961 | return ERR_PTR(-ENOMEM); |
| 962 | nfs_init_lock_context(new); |
| 963 | spin_lock(&inode->i_lock); |
| 964 | res = __nfs_find_lock_context(ctx); |
| 965 | if (res == NULL) { |
| 966 | new->open_context = get_nfs_open_context(ctx); |
| 967 | if (new->open_context) { |
| 968 | list_add_tail_rcu(&new->list, |
| 969 | &ctx->lock_context.list); |
| 970 | res = new; |
| 971 | new = NULL; |
| 972 | } else |
| 973 | res = ERR_PTR(-EBADF); |
| 974 | } |
| 975 | spin_unlock(&inode->i_lock); |
| 976 | kfree(new); |
| 977 | } |
| 978 | return res; |
| 979 | } |
| 980 | EXPORT_SYMBOL_GPL(nfs_get_lock_context); |
| 981 | |
| 982 | void nfs_put_lock_context(struct nfs_lock_context *l_ctx) |
| 983 | { |
| 984 | struct nfs_open_context *ctx = l_ctx->open_context; |
| 985 | struct inode *inode = d_inode(ctx->dentry); |
| 986 | |
| 987 | if (!refcount_dec_and_lock(&l_ctx->count, &inode->i_lock)) |
| 988 | return; |
| 989 | list_del_rcu(&l_ctx->list); |
| 990 | spin_unlock(&inode->i_lock); |
| 991 | put_nfs_open_context(ctx); |
| 992 | kfree_rcu(l_ctx, rcu_head); |
| 993 | } |
| 994 | EXPORT_SYMBOL_GPL(nfs_put_lock_context); |
| 995 | |
| 996 | /** |
| 997 | * nfs_close_context - Common close_context() routine NFSv2/v3 |
| 998 | * @ctx: pointer to context |
| 999 | * @is_sync: is this a synchronous close |
| 1000 | * |
| 1001 | * Ensure that the attributes are up to date if we're mounted |
| 1002 | * with close-to-open semantics and we have cached data that will |
| 1003 | * need to be revalidated on open. |
| 1004 | */ |
| 1005 | void nfs_close_context(struct nfs_open_context *ctx, int is_sync) |
| 1006 | { |
| 1007 | struct nfs_inode *nfsi; |
| 1008 | struct inode *inode; |
| 1009 | |
| 1010 | if (!(ctx->mode & FMODE_WRITE)) |
| 1011 | return; |
| 1012 | if (!is_sync) |
| 1013 | return; |
| 1014 | inode = d_inode(ctx->dentry); |
| 1015 | if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ)) |
| 1016 | return; |
| 1017 | nfsi = NFS_I(inode); |
| 1018 | if (inode->i_mapping->nrpages == 0) |
| 1019 | return; |
| 1020 | if (nfsi->cache_validity & NFS_INO_INVALID_DATA) |
| 1021 | return; |
| 1022 | if (!list_empty(&nfsi->open_files)) |
| 1023 | return; |
| 1024 | if (NFS_SERVER(inode)->flags & NFS_MOUNT_NOCTO) |
| 1025 | return; |
| 1026 | nfs_revalidate_inode(inode, |
| 1027 | NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_SIZE); |
| 1028 | } |
| 1029 | EXPORT_SYMBOL_GPL(nfs_close_context); |
| 1030 | |
| 1031 | struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, |
| 1032 | fmode_t f_mode, |
| 1033 | struct file *filp) |
| 1034 | { |
| 1035 | struct nfs_open_context *ctx; |
| 1036 | |
| 1037 | ctx = kmalloc(sizeof(*ctx), GFP_KERNEL_ACCOUNT); |
| 1038 | if (!ctx) |
| 1039 | return ERR_PTR(-ENOMEM); |
| 1040 | nfs_sb_active(dentry->d_sb); |
| 1041 | ctx->dentry = dget(dentry); |
| 1042 | if (filp) |
| 1043 | ctx->cred = get_cred(filp->f_cred); |
| 1044 | else |
| 1045 | ctx->cred = get_current_cred(); |
| 1046 | rcu_assign_pointer(ctx->ll_cred, NULL); |
| 1047 | ctx->state = NULL; |
| 1048 | ctx->mode = f_mode; |
| 1049 | ctx->flags = 0; |
| 1050 | ctx->error = 0; |
| 1051 | ctx->flock_owner = (fl_owner_t)filp; |
| 1052 | nfs_init_lock_context(&ctx->lock_context); |
| 1053 | ctx->lock_context.open_context = ctx; |
| 1054 | INIT_LIST_HEAD(&ctx->list); |
| 1055 | ctx->mdsthreshold = NULL; |
| 1056 | return ctx; |
| 1057 | } |
| 1058 | EXPORT_SYMBOL_GPL(alloc_nfs_open_context); |
| 1059 | |
| 1060 | struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx) |
| 1061 | { |
| 1062 | if (ctx != NULL && refcount_inc_not_zero(&ctx->lock_context.count)) |
| 1063 | return ctx; |
| 1064 | return NULL; |
| 1065 | } |
| 1066 | EXPORT_SYMBOL_GPL(get_nfs_open_context); |
| 1067 | |
| 1068 | static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync) |
| 1069 | { |
| 1070 | struct inode *inode = d_inode(ctx->dentry); |
| 1071 | struct super_block *sb = ctx->dentry->d_sb; |
| 1072 | |
| 1073 | if (!refcount_dec_and_test(&ctx->lock_context.count)) |
| 1074 | return; |
| 1075 | if (!list_empty(&ctx->list)) { |
| 1076 | spin_lock(&inode->i_lock); |
| 1077 | list_del_rcu(&ctx->list); |
| 1078 | spin_unlock(&inode->i_lock); |
| 1079 | } |
| 1080 | if (inode != NULL) |
| 1081 | NFS_PROTO(inode)->close_context(ctx, is_sync); |
| 1082 | put_cred(ctx->cred); |
| 1083 | dput(ctx->dentry); |
| 1084 | nfs_sb_deactive(sb); |
| 1085 | put_rpccred(rcu_dereference_protected(ctx->ll_cred, 1)); |
| 1086 | kfree(ctx->mdsthreshold); |
| 1087 | kfree_rcu(ctx, rcu_head); |
| 1088 | } |
| 1089 | |
| 1090 | void put_nfs_open_context(struct nfs_open_context *ctx) |
| 1091 | { |
| 1092 | __put_nfs_open_context(ctx, 0); |
| 1093 | } |
| 1094 | EXPORT_SYMBOL_GPL(put_nfs_open_context); |
| 1095 | |
| 1096 | static void put_nfs_open_context_sync(struct nfs_open_context *ctx) |
| 1097 | { |
| 1098 | __put_nfs_open_context(ctx, 1); |
| 1099 | } |
| 1100 | |
| 1101 | /* |
| 1102 | * Ensure that mmap has a recent RPC credential for use when writing out |
| 1103 | * shared pages |
| 1104 | */ |
| 1105 | void nfs_inode_attach_open_context(struct nfs_open_context *ctx) |
| 1106 | { |
| 1107 | struct inode *inode = d_inode(ctx->dentry); |
| 1108 | struct nfs_inode *nfsi = NFS_I(inode); |
| 1109 | |
| 1110 | spin_lock(&inode->i_lock); |
| 1111 | if (list_empty(&nfsi->open_files) && |
| 1112 | nfs_ooo_test(nfsi)) |
| 1113 | nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA | |
| 1114 | NFS_INO_REVAL_FORCED); |
| 1115 | list_add_tail_rcu(&ctx->list, &nfsi->open_files); |
| 1116 | spin_unlock(&inode->i_lock); |
| 1117 | } |
| 1118 | EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context); |
| 1119 | |
| 1120 | void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx) |
| 1121 | { |
| 1122 | filp->private_data = get_nfs_open_context(ctx); |
| 1123 | set_bit(NFS_CONTEXT_FILE_OPEN, &ctx->flags); |
| 1124 | if (list_empty(&ctx->list)) |
| 1125 | nfs_inode_attach_open_context(ctx); |
| 1126 | } |
| 1127 | EXPORT_SYMBOL_GPL(nfs_file_set_open_context); |
| 1128 | |
| 1129 | /* |
| 1130 | * Given an inode, search for an open context with the desired characteristics |
| 1131 | */ |
| 1132 | struct nfs_open_context *nfs_find_open_context(struct inode *inode, const struct cred *cred, fmode_t mode) |
| 1133 | { |
| 1134 | struct nfs_inode *nfsi = NFS_I(inode); |
| 1135 | struct nfs_open_context *pos, *ctx = NULL; |
| 1136 | |
| 1137 | rcu_read_lock(); |
| 1138 | list_for_each_entry_rcu(pos, &nfsi->open_files, list) { |
| 1139 | if (cred != NULL && cred_fscmp(pos->cred, cred) != 0) |
| 1140 | continue; |
| 1141 | if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode) |
| 1142 | continue; |
| 1143 | if (!test_bit(NFS_CONTEXT_FILE_OPEN, &pos->flags)) |
| 1144 | continue; |
| 1145 | ctx = get_nfs_open_context(pos); |
| 1146 | if (ctx) |
| 1147 | break; |
| 1148 | } |
| 1149 | rcu_read_unlock(); |
| 1150 | return ctx; |
| 1151 | } |
| 1152 | |
| 1153 | void nfs_file_clear_open_context(struct file *filp) |
| 1154 | { |
| 1155 | struct nfs_open_context *ctx = nfs_file_open_context(filp); |
| 1156 | |
| 1157 | if (ctx) { |
| 1158 | struct inode *inode = d_inode(ctx->dentry); |
| 1159 | |
| 1160 | clear_bit(NFS_CONTEXT_FILE_OPEN, &ctx->flags); |
| 1161 | /* |
| 1162 | * We fatal error on write before. Try to writeback |
| 1163 | * every page again. |
| 1164 | */ |
| 1165 | if (ctx->error < 0) |
| 1166 | invalidate_inode_pages2(inode->i_mapping); |
| 1167 | filp->private_data = NULL; |
| 1168 | put_nfs_open_context_sync(ctx); |
| 1169 | } |
| 1170 | } |
| 1171 | |
| 1172 | /* |
| 1173 | * These allocate and release file read/write context information. |
| 1174 | */ |
| 1175 | int nfs_open(struct inode *inode, struct file *filp) |
| 1176 | { |
| 1177 | struct nfs_open_context *ctx; |
| 1178 | |
| 1179 | ctx = alloc_nfs_open_context(file_dentry(filp), |
| 1180 | flags_to_mode(filp->f_flags), filp); |
| 1181 | if (IS_ERR(ctx)) |
| 1182 | return PTR_ERR(ctx); |
| 1183 | nfs_file_set_open_context(filp, ctx); |
| 1184 | put_nfs_open_context(ctx); |
| 1185 | nfs_fscache_open_file(inode, filp); |
| 1186 | return 0; |
| 1187 | } |
| 1188 | |
| 1189 | /* |
| 1190 | * This function is called whenever some part of NFS notices that |
| 1191 | * the cached attributes have to be refreshed. |
| 1192 | */ |
| 1193 | int |
| 1194 | __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) |
| 1195 | { |
| 1196 | int status = -ESTALE; |
| 1197 | struct nfs_fattr *fattr = NULL; |
| 1198 | struct nfs_inode *nfsi = NFS_I(inode); |
| 1199 | |
| 1200 | dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n", |
| 1201 | inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode)); |
| 1202 | |
| 1203 | trace_nfs_revalidate_inode_enter(inode); |
| 1204 | |
| 1205 | if (is_bad_inode(inode)) |
| 1206 | goto out; |
| 1207 | if (NFS_STALE(inode)) |
| 1208 | goto out; |
| 1209 | |
| 1210 | /* pNFS: Attributes aren't updated until we layoutcommit */ |
| 1211 | if (S_ISREG(inode->i_mode)) { |
| 1212 | status = pnfs_sync_inode(inode, false); |
| 1213 | if (status) |
| 1214 | goto out; |
| 1215 | } |
| 1216 | |
| 1217 | status = -ENOMEM; |
| 1218 | fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode)); |
| 1219 | if (fattr == NULL) |
| 1220 | goto out; |
| 1221 | |
| 1222 | nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE); |
| 1223 | |
| 1224 | status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, inode); |
| 1225 | if (status != 0) { |
| 1226 | dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n", |
| 1227 | inode->i_sb->s_id, |
| 1228 | (unsigned long long)NFS_FILEID(inode), status); |
| 1229 | switch (status) { |
| 1230 | case -ETIMEDOUT: |
| 1231 | /* A soft timeout occurred. Use cached information? */ |
| 1232 | if (server->flags & NFS_MOUNT_SOFTREVAL) |
| 1233 | status = 0; |
| 1234 | break; |
| 1235 | case -ESTALE: |
| 1236 | if (!S_ISDIR(inode->i_mode)) |
| 1237 | nfs_set_inode_stale(inode); |
| 1238 | else |
| 1239 | nfs_zap_caches(inode); |
| 1240 | } |
| 1241 | goto out; |
| 1242 | } |
| 1243 | |
| 1244 | status = nfs_refresh_inode(inode, fattr); |
| 1245 | if (status) { |
| 1246 | dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n", |
| 1247 | inode->i_sb->s_id, |
| 1248 | (unsigned long long)NFS_FILEID(inode), status); |
| 1249 | goto out; |
| 1250 | } |
| 1251 | |
| 1252 | if (nfsi->cache_validity & NFS_INO_INVALID_ACL) |
| 1253 | nfs_zap_acl_cache(inode); |
| 1254 | |
| 1255 | nfs_setsecurity(inode, fattr); |
| 1256 | |
| 1257 | dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n", |
| 1258 | inode->i_sb->s_id, |
| 1259 | (unsigned long long)NFS_FILEID(inode)); |
| 1260 | |
| 1261 | out: |
| 1262 | nfs_free_fattr(fattr); |
| 1263 | trace_nfs_revalidate_inode_exit(inode, status); |
| 1264 | return status; |
| 1265 | } |
| 1266 | |
| 1267 | int nfs_attribute_cache_expired(struct inode *inode) |
| 1268 | { |
| 1269 | if (nfs_have_delegated_attributes(inode)) |
| 1270 | return 0; |
| 1271 | return nfs_attribute_timeout(inode); |
| 1272 | } |
| 1273 | |
| 1274 | /** |
| 1275 | * nfs_revalidate_inode - Revalidate the inode attributes |
| 1276 | * @inode: pointer to inode struct |
| 1277 | * @flags: cache flags to check |
| 1278 | * |
| 1279 | * Updates inode attribute information by retrieving the data from the server. |
| 1280 | */ |
| 1281 | int nfs_revalidate_inode(struct inode *inode, unsigned long flags) |
| 1282 | { |
| 1283 | if (!nfs_check_cache_invalid(inode, flags)) |
| 1284 | return NFS_STALE(inode) ? -ESTALE : 0; |
| 1285 | return __nfs_revalidate_inode(NFS_SERVER(inode), inode); |
| 1286 | } |
| 1287 | EXPORT_SYMBOL_GPL(nfs_revalidate_inode); |
| 1288 | |
| 1289 | static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping) |
| 1290 | { |
| 1291 | int ret; |
| 1292 | |
| 1293 | nfs_fscache_invalidate(inode, 0); |
| 1294 | if (mapping->nrpages != 0) { |
| 1295 | if (S_ISREG(inode->i_mode)) { |
| 1296 | ret = nfs_sync_mapping(mapping); |
| 1297 | if (ret < 0) |
| 1298 | return ret; |
| 1299 | } |
| 1300 | ret = invalidate_inode_pages2(mapping); |
| 1301 | if (ret < 0) |
| 1302 | return ret; |
| 1303 | } |
| 1304 | nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE); |
| 1305 | |
| 1306 | dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n", |
| 1307 | inode->i_sb->s_id, |
| 1308 | (unsigned long long)NFS_FILEID(inode)); |
| 1309 | return 0; |
| 1310 | } |
| 1311 | |
| 1312 | /** |
| 1313 | * nfs_clear_invalid_mapping - Conditionally clear a mapping |
| 1314 | * @mapping: pointer to mapping |
| 1315 | * |
| 1316 | * If the NFS_INO_INVALID_DATA inode flag is set, clear the mapping. |
| 1317 | */ |
| 1318 | int nfs_clear_invalid_mapping(struct address_space *mapping) |
| 1319 | { |
| 1320 | struct inode *inode = mapping->host; |
| 1321 | struct nfs_inode *nfsi = NFS_I(inode); |
| 1322 | unsigned long *bitlock = &nfsi->flags; |
| 1323 | int ret = 0; |
| 1324 | |
| 1325 | /* |
| 1326 | * We must clear NFS_INO_INVALID_DATA first to ensure that |
| 1327 | * invalidations that come in while we're shooting down the mappings |
| 1328 | * are respected. But, that leaves a race window where one revalidator |
| 1329 | * can clear the flag, and then another checks it before the mapping |
| 1330 | * gets invalidated. Fix that by serializing access to this part of |
| 1331 | * the function. |
| 1332 | * |
| 1333 | * At the same time, we need to allow other tasks to see whether we |
| 1334 | * might be in the middle of invalidating the pages, so we only set |
| 1335 | * the bit lock here if it looks like we're going to be doing that. |
| 1336 | */ |
| 1337 | for (;;) { |
| 1338 | ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING, |
| 1339 | nfs_wait_bit_killable, |
| 1340 | TASK_KILLABLE|TASK_FREEZABLE_UNSAFE); |
| 1341 | if (ret) |
| 1342 | goto out; |
| 1343 | spin_lock(&inode->i_lock); |
| 1344 | if (test_bit(NFS_INO_INVALIDATING, bitlock)) { |
| 1345 | spin_unlock(&inode->i_lock); |
| 1346 | continue; |
| 1347 | } |
| 1348 | if (nfsi->cache_validity & NFS_INO_INVALID_DATA) |
| 1349 | break; |
| 1350 | spin_unlock(&inode->i_lock); |
| 1351 | goto out; |
| 1352 | } |
| 1353 | |
| 1354 | set_bit(NFS_INO_INVALIDATING, bitlock); |
| 1355 | smp_wmb(); |
| 1356 | nfsi->cache_validity &= ~NFS_INO_INVALID_DATA; |
| 1357 | nfs_ooo_clear(nfsi); |
| 1358 | spin_unlock(&inode->i_lock); |
| 1359 | trace_nfs_invalidate_mapping_enter(inode); |
| 1360 | ret = nfs_invalidate_mapping(inode, mapping); |
| 1361 | trace_nfs_invalidate_mapping_exit(inode, ret); |
| 1362 | |
| 1363 | clear_bit_unlock(NFS_INO_INVALIDATING, bitlock); |
| 1364 | smp_mb__after_atomic(); |
| 1365 | wake_up_bit(bitlock, NFS_INO_INVALIDATING); |
| 1366 | out: |
| 1367 | return ret; |
| 1368 | } |
| 1369 | |
| 1370 | bool nfs_mapping_need_revalidate_inode(struct inode *inode) |
| 1371 | { |
| 1372 | return nfs_check_cache_invalid(inode, NFS_INO_INVALID_CHANGE) || |
| 1373 | NFS_STALE(inode); |
| 1374 | } |
| 1375 | |
| 1376 | int nfs_revalidate_mapping_rcu(struct inode *inode) |
| 1377 | { |
| 1378 | struct nfs_inode *nfsi = NFS_I(inode); |
| 1379 | unsigned long *bitlock = &nfsi->flags; |
| 1380 | int ret = 0; |
| 1381 | |
| 1382 | if (IS_SWAPFILE(inode)) |
| 1383 | goto out; |
| 1384 | if (nfs_mapping_need_revalidate_inode(inode)) { |
| 1385 | ret = -ECHILD; |
| 1386 | goto out; |
| 1387 | } |
| 1388 | spin_lock(&inode->i_lock); |
| 1389 | if (test_bit(NFS_INO_INVALIDATING, bitlock) || |
| 1390 | (nfsi->cache_validity & NFS_INO_INVALID_DATA)) |
| 1391 | ret = -ECHILD; |
| 1392 | spin_unlock(&inode->i_lock); |
| 1393 | out: |
| 1394 | return ret; |
| 1395 | } |
| 1396 | |
| 1397 | /** |
| 1398 | * nfs_revalidate_mapping - Revalidate the pagecache |
| 1399 | * @inode: pointer to host inode |
| 1400 | * @mapping: pointer to mapping |
| 1401 | */ |
| 1402 | int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping) |
| 1403 | { |
| 1404 | /* swapfiles are not supposed to be shared. */ |
| 1405 | if (IS_SWAPFILE(inode)) |
| 1406 | return 0; |
| 1407 | |
| 1408 | if (nfs_mapping_need_revalidate_inode(inode)) { |
| 1409 | int ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode); |
| 1410 | if (ret < 0) |
| 1411 | return ret; |
| 1412 | } |
| 1413 | |
| 1414 | return nfs_clear_invalid_mapping(mapping); |
| 1415 | } |
| 1416 | |
| 1417 | static bool nfs_file_has_writers(struct nfs_inode *nfsi) |
| 1418 | { |
| 1419 | struct inode *inode = &nfsi->vfs_inode; |
| 1420 | |
| 1421 | if (!S_ISREG(inode->i_mode)) |
| 1422 | return false; |
| 1423 | if (list_empty(&nfsi->open_files)) |
| 1424 | return false; |
| 1425 | return inode_is_open_for_write(inode); |
| 1426 | } |
| 1427 | |
| 1428 | static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi) |
| 1429 | { |
| 1430 | return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi); |
| 1431 | } |
| 1432 | |
| 1433 | static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr) |
| 1434 | { |
| 1435 | struct timespec64 ts; |
| 1436 | |
| 1437 | if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE) |
| 1438 | && (fattr->valid & NFS_ATTR_FATTR_CHANGE) |
| 1439 | && inode_eq_iversion_raw(inode, fattr->pre_change_attr)) { |
| 1440 | inode_set_iversion_raw(inode, fattr->change_attr); |
| 1441 | if (S_ISDIR(inode->i_mode)) |
| 1442 | nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA); |
| 1443 | else if (nfs_server_capable(inode, NFS_CAP_XATTR)) |
| 1444 | nfs_set_cache_invalid(inode, NFS_INO_INVALID_XATTR); |
| 1445 | } |
| 1446 | /* If we have atomic WCC data, we may update some attributes */ |
| 1447 | ts = inode_get_ctime(inode); |
| 1448 | if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME) |
| 1449 | && (fattr->valid & NFS_ATTR_FATTR_CTIME) |
| 1450 | && timespec64_equal(&ts, &fattr->pre_ctime)) { |
| 1451 | inode_set_ctime_to_ts(inode, fattr->ctime); |
| 1452 | } |
| 1453 | |
| 1454 | ts = inode_get_mtime(inode); |
| 1455 | if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME) |
| 1456 | && (fattr->valid & NFS_ATTR_FATTR_MTIME) |
| 1457 | && timespec64_equal(&ts, &fattr->pre_mtime)) { |
| 1458 | inode_set_mtime_to_ts(inode, fattr->mtime); |
| 1459 | } |
| 1460 | if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE) |
| 1461 | && (fattr->valid & NFS_ATTR_FATTR_SIZE) |
| 1462 | && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size) |
| 1463 | && !nfs_have_writebacks(inode)) { |
| 1464 | trace_nfs_size_wcc(inode, fattr->size); |
| 1465 | i_size_write(inode, nfs_size_to_loff_t(fattr->size)); |
| 1466 | } |
| 1467 | } |
| 1468 | |
| 1469 | /** |
| 1470 | * nfs_check_inode_attributes - verify consistency of the inode attribute cache |
| 1471 | * @inode: pointer to inode |
| 1472 | * @fattr: updated attributes |
| 1473 | * |
| 1474 | * Verifies the attribute cache. If we have just changed the attributes, |
| 1475 | * so that fattr carries weak cache consistency data, then it may |
| 1476 | * also update the ctime/mtime/change_attribute. |
| 1477 | */ |
| 1478 | static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr) |
| 1479 | { |
| 1480 | struct nfs_inode *nfsi = NFS_I(inode); |
| 1481 | loff_t cur_size, new_isize; |
| 1482 | unsigned long invalid = 0; |
| 1483 | struct timespec64 ts; |
| 1484 | |
| 1485 | if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ)) |
| 1486 | return 0; |
| 1487 | |
| 1488 | if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) { |
| 1489 | /* Only a mounted-on-fileid? Just exit */ |
| 1490 | if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) |
| 1491 | return 0; |
| 1492 | /* Has the inode gone and changed behind our back? */ |
| 1493 | } else if (nfsi->fileid != fattr->fileid) { |
| 1494 | /* Is this perhaps the mounted-on fileid? */ |
| 1495 | if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) && |
| 1496 | nfsi->fileid == fattr->mounted_on_fileid) |
| 1497 | return 0; |
| 1498 | return -ESTALE; |
| 1499 | } |
| 1500 | if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && inode_wrong_type(inode, fattr->mode)) |
| 1501 | return -ESTALE; |
| 1502 | |
| 1503 | |
| 1504 | if (!nfs_file_has_buffered_writers(nfsi)) { |
| 1505 | /* Verify a few of the more important attributes */ |
| 1506 | if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && !inode_eq_iversion_raw(inode, fattr->change_attr)) |
| 1507 | invalid |= NFS_INO_INVALID_CHANGE; |
| 1508 | |
| 1509 | ts = inode_get_mtime(inode); |
| 1510 | if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec64_equal(&ts, &fattr->mtime)) |
| 1511 | invalid |= NFS_INO_INVALID_MTIME; |
| 1512 | |
| 1513 | ts = inode_get_ctime(inode); |
| 1514 | if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec64_equal(&ts, &fattr->ctime)) |
| 1515 | invalid |= NFS_INO_INVALID_CTIME; |
| 1516 | |
| 1517 | if (fattr->valid & NFS_ATTR_FATTR_SIZE) { |
| 1518 | cur_size = i_size_read(inode); |
| 1519 | new_isize = nfs_size_to_loff_t(fattr->size); |
| 1520 | if (cur_size != new_isize) |
| 1521 | invalid |= NFS_INO_INVALID_SIZE; |
| 1522 | } |
| 1523 | } |
| 1524 | |
| 1525 | /* Have any file permissions changed? */ |
| 1526 | if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) |
| 1527 | invalid |= NFS_INO_INVALID_MODE; |
| 1528 | if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid)) |
| 1529 | invalid |= NFS_INO_INVALID_OTHER; |
| 1530 | if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid)) |
| 1531 | invalid |= NFS_INO_INVALID_OTHER; |
| 1532 | |
| 1533 | /* Has the link count changed? */ |
| 1534 | if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink) |
| 1535 | invalid |= NFS_INO_INVALID_NLINK; |
| 1536 | |
| 1537 | ts = inode_get_atime(inode); |
| 1538 | if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec64_equal(&ts, &fattr->atime)) |
| 1539 | invalid |= NFS_INO_INVALID_ATIME; |
| 1540 | |
| 1541 | if (invalid != 0) |
| 1542 | nfs_set_cache_invalid(inode, invalid); |
| 1543 | |
| 1544 | nfsi->read_cache_jiffies = fattr->time_start; |
| 1545 | return 0; |
| 1546 | } |
| 1547 | |
| 1548 | static atomic_long_t nfs_attr_generation_counter; |
| 1549 | |
| 1550 | static unsigned long nfs_read_attr_generation_counter(void) |
| 1551 | { |
| 1552 | return atomic_long_read(&nfs_attr_generation_counter); |
| 1553 | } |
| 1554 | |
| 1555 | unsigned long nfs_inc_attr_generation_counter(void) |
| 1556 | { |
| 1557 | return atomic_long_inc_return(&nfs_attr_generation_counter); |
| 1558 | } |
| 1559 | EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter); |
| 1560 | |
| 1561 | void nfs_fattr_init(struct nfs_fattr *fattr) |
| 1562 | { |
| 1563 | fattr->valid = 0; |
| 1564 | fattr->time_start = jiffies; |
| 1565 | fattr->gencount = nfs_inc_attr_generation_counter(); |
| 1566 | fattr->owner_name = NULL; |
| 1567 | fattr->group_name = NULL; |
| 1568 | } |
| 1569 | EXPORT_SYMBOL_GPL(nfs_fattr_init); |
| 1570 | |
| 1571 | /** |
| 1572 | * nfs_fattr_set_barrier |
| 1573 | * @fattr: attributes |
| 1574 | * |
| 1575 | * Used to set a barrier after an attribute was updated. This |
| 1576 | * barrier ensures that older attributes from RPC calls that may |
| 1577 | * have raced with our update cannot clobber these new values. |
| 1578 | * Note that you are still responsible for ensuring that other |
| 1579 | * operations which change the attribute on the server do not |
| 1580 | * collide. |
| 1581 | */ |
| 1582 | void nfs_fattr_set_barrier(struct nfs_fattr *fattr) |
| 1583 | { |
| 1584 | fattr->gencount = nfs_inc_attr_generation_counter(); |
| 1585 | } |
| 1586 | |
| 1587 | struct nfs_fattr *nfs_alloc_fattr(void) |
| 1588 | { |
| 1589 | struct nfs_fattr *fattr; |
| 1590 | |
| 1591 | fattr = kmalloc(sizeof(*fattr), GFP_KERNEL); |
| 1592 | if (fattr != NULL) { |
| 1593 | nfs_fattr_init(fattr); |
| 1594 | fattr->label = NULL; |
| 1595 | } |
| 1596 | return fattr; |
| 1597 | } |
| 1598 | EXPORT_SYMBOL_GPL(nfs_alloc_fattr); |
| 1599 | |
| 1600 | struct nfs_fattr *nfs_alloc_fattr_with_label(struct nfs_server *server) |
| 1601 | { |
| 1602 | struct nfs_fattr *fattr = nfs_alloc_fattr(); |
| 1603 | |
| 1604 | if (!fattr) |
| 1605 | return NULL; |
| 1606 | |
| 1607 | fattr->label = nfs4_label_alloc(server, GFP_KERNEL); |
| 1608 | if (IS_ERR(fattr->label)) { |
| 1609 | kfree(fattr); |
| 1610 | return NULL; |
| 1611 | } |
| 1612 | |
| 1613 | return fattr; |
| 1614 | } |
| 1615 | EXPORT_SYMBOL_GPL(nfs_alloc_fattr_with_label); |
| 1616 | |
| 1617 | struct nfs_fh *nfs_alloc_fhandle(void) |
| 1618 | { |
| 1619 | struct nfs_fh *fh; |
| 1620 | |
| 1621 | fh = kmalloc(sizeof(struct nfs_fh), GFP_KERNEL); |
| 1622 | if (fh != NULL) |
| 1623 | fh->size = 0; |
| 1624 | return fh; |
| 1625 | } |
| 1626 | EXPORT_SYMBOL_GPL(nfs_alloc_fhandle); |
| 1627 | |
| 1628 | #ifdef NFS_DEBUG |
| 1629 | /* |
| 1630 | * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle |
| 1631 | * in the same way that wireshark does |
| 1632 | * |
| 1633 | * @fh: file handle |
| 1634 | * |
| 1635 | * For debugging only. |
| 1636 | */ |
| 1637 | u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh) |
| 1638 | { |
| 1639 | /* wireshark uses 32-bit AUTODIN crc and does a bitwise |
| 1640 | * not on the result */ |
| 1641 | return nfs_fhandle_hash(fh); |
| 1642 | } |
| 1643 | EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash); |
| 1644 | |
| 1645 | /* |
| 1646 | * _nfs_display_fhandle - display an NFS file handle on the console |
| 1647 | * |
| 1648 | * @fh: file handle to display |
| 1649 | * @caption: display caption |
| 1650 | * |
| 1651 | * For debugging only. |
| 1652 | */ |
| 1653 | void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption) |
| 1654 | { |
| 1655 | unsigned short i; |
| 1656 | |
| 1657 | if (fh == NULL || fh->size == 0) { |
| 1658 | printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh); |
| 1659 | return; |
| 1660 | } |
| 1661 | |
| 1662 | printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n", |
| 1663 | caption, fh, fh->size, _nfs_display_fhandle_hash(fh)); |
| 1664 | for (i = 0; i < fh->size; i += 16) { |
| 1665 | __be32 *pos = (__be32 *)&fh->data[i]; |
| 1666 | |
| 1667 | switch ((fh->size - i - 1) >> 2) { |
| 1668 | case 0: |
| 1669 | printk(KERN_DEFAULT " %08x\n", |
| 1670 | be32_to_cpup(pos)); |
| 1671 | break; |
| 1672 | case 1: |
| 1673 | printk(KERN_DEFAULT " %08x %08x\n", |
| 1674 | be32_to_cpup(pos), be32_to_cpup(pos + 1)); |
| 1675 | break; |
| 1676 | case 2: |
| 1677 | printk(KERN_DEFAULT " %08x %08x %08x\n", |
| 1678 | be32_to_cpup(pos), be32_to_cpup(pos + 1), |
| 1679 | be32_to_cpup(pos + 2)); |
| 1680 | break; |
| 1681 | default: |
| 1682 | printk(KERN_DEFAULT " %08x %08x %08x %08x\n", |
| 1683 | be32_to_cpup(pos), be32_to_cpup(pos + 1), |
| 1684 | be32_to_cpup(pos + 2), be32_to_cpup(pos + 3)); |
| 1685 | } |
| 1686 | } |
| 1687 | } |
| 1688 | EXPORT_SYMBOL_GPL(_nfs_display_fhandle); |
| 1689 | #endif |
| 1690 | |
| 1691 | /** |
| 1692 | * nfs_inode_attrs_cmp_generic - compare attributes |
| 1693 | * @fattr: attributes |
| 1694 | * @inode: pointer to inode |
| 1695 | * |
| 1696 | * Attempt to divine whether or not an RPC call reply carrying stale |
| 1697 | * attributes got scheduled after another call carrying updated ones. |
| 1698 | * Note also the check for wraparound of 'attr_gencount' |
| 1699 | * |
| 1700 | * The function returns '1' if it thinks the attributes in @fattr are |
| 1701 | * more recent than the ones cached in @inode. Otherwise it returns |
| 1702 | * the value '0'. |
| 1703 | */ |
| 1704 | static int nfs_inode_attrs_cmp_generic(const struct nfs_fattr *fattr, |
| 1705 | const struct inode *inode) |
| 1706 | { |
| 1707 | unsigned long attr_gencount = NFS_I(inode)->attr_gencount; |
| 1708 | |
| 1709 | return (long)(fattr->gencount - attr_gencount) > 0 || |
| 1710 | (long)(attr_gencount - nfs_read_attr_generation_counter()) > 0; |
| 1711 | } |
| 1712 | |
| 1713 | /** |
| 1714 | * nfs_inode_attrs_cmp_monotonic - compare attributes |
| 1715 | * @fattr: attributes |
| 1716 | * @inode: pointer to inode |
| 1717 | * |
| 1718 | * Attempt to divine whether or not an RPC call reply carrying stale |
| 1719 | * attributes got scheduled after another call carrying updated ones. |
| 1720 | * |
| 1721 | * We assume that the server observes monotonic semantics for |
| 1722 | * the change attribute, so a larger value means that the attributes in |
| 1723 | * @fattr are more recent, in which case the function returns the |
| 1724 | * value '1'. |
| 1725 | * A return value of '0' indicates no measurable change |
| 1726 | * A return value of '-1' means that the attributes in @inode are |
| 1727 | * more recent. |
| 1728 | */ |
| 1729 | static int nfs_inode_attrs_cmp_monotonic(const struct nfs_fattr *fattr, |
| 1730 | const struct inode *inode) |
| 1731 | { |
| 1732 | s64 diff = fattr->change_attr - inode_peek_iversion_raw(inode); |
| 1733 | if (diff > 0) |
| 1734 | return 1; |
| 1735 | return diff == 0 ? 0 : -1; |
| 1736 | } |
| 1737 | |
| 1738 | /** |
| 1739 | * nfs_inode_attrs_cmp_strict_monotonic - compare attributes |
| 1740 | * @fattr: attributes |
| 1741 | * @inode: pointer to inode |
| 1742 | * |
| 1743 | * Attempt to divine whether or not an RPC call reply carrying stale |
| 1744 | * attributes got scheduled after another call carrying updated ones. |
| 1745 | * |
| 1746 | * We assume that the server observes strictly monotonic semantics for |
| 1747 | * the change attribute, so a larger value means that the attributes in |
| 1748 | * @fattr are more recent, in which case the function returns the |
| 1749 | * value '1'. |
| 1750 | * A return value of '-1' means that the attributes in @inode are |
| 1751 | * more recent or unchanged. |
| 1752 | */ |
| 1753 | static int nfs_inode_attrs_cmp_strict_monotonic(const struct nfs_fattr *fattr, |
| 1754 | const struct inode *inode) |
| 1755 | { |
| 1756 | return nfs_inode_attrs_cmp_monotonic(fattr, inode) > 0 ? 1 : -1; |
| 1757 | } |
| 1758 | |
| 1759 | /** |
| 1760 | * nfs_inode_attrs_cmp - compare attributes |
| 1761 | * @fattr: attributes |
| 1762 | * @inode: pointer to inode |
| 1763 | * |
| 1764 | * This function returns '1' if it thinks the attributes in @fattr are |
| 1765 | * more recent than the ones cached in @inode. It returns '-1' if |
| 1766 | * the attributes in @inode are more recent than the ones in @fattr, |
| 1767 | * and it returns 0 if not sure. |
| 1768 | */ |
| 1769 | static int nfs_inode_attrs_cmp(const struct nfs_fattr *fattr, |
| 1770 | const struct inode *inode) |
| 1771 | { |
| 1772 | if (nfs_inode_attrs_cmp_generic(fattr, inode) > 0) |
| 1773 | return 1; |
| 1774 | switch (NFS_SERVER(inode)->change_attr_type) { |
| 1775 | case NFS4_CHANGE_TYPE_IS_UNDEFINED: |
| 1776 | break; |
| 1777 | case NFS4_CHANGE_TYPE_IS_TIME_METADATA: |
| 1778 | if (!(fattr->valid & NFS_ATTR_FATTR_CHANGE)) |
| 1779 | break; |
| 1780 | return nfs_inode_attrs_cmp_monotonic(fattr, inode); |
| 1781 | default: |
| 1782 | if (!(fattr->valid & NFS_ATTR_FATTR_CHANGE)) |
| 1783 | break; |
| 1784 | return nfs_inode_attrs_cmp_strict_monotonic(fattr, inode); |
| 1785 | } |
| 1786 | return 0; |
| 1787 | } |
| 1788 | |
| 1789 | /** |
| 1790 | * nfs_inode_finish_partial_attr_update - complete a previous inode update |
| 1791 | * @fattr: attributes |
| 1792 | * @inode: pointer to inode |
| 1793 | * |
| 1794 | * Returns '1' if the last attribute update left the inode cached |
| 1795 | * attributes in a partially unrevalidated state, and @fattr |
| 1796 | * matches the change attribute of that partial update. |
| 1797 | * Otherwise returns '0'. |
| 1798 | */ |
| 1799 | static int nfs_inode_finish_partial_attr_update(const struct nfs_fattr *fattr, |
| 1800 | const struct inode *inode) |
| 1801 | { |
| 1802 | const unsigned long check_valid = |
| 1803 | NFS_INO_INVALID_ATIME | NFS_INO_INVALID_CTIME | |
| 1804 | NFS_INO_INVALID_MTIME | NFS_INO_INVALID_SIZE | |
| 1805 | NFS_INO_INVALID_BLOCKS | NFS_INO_INVALID_OTHER | |
| 1806 | NFS_INO_INVALID_NLINK; |
| 1807 | unsigned long cache_validity = NFS_I(inode)->cache_validity; |
| 1808 | enum nfs4_change_attr_type ctype = NFS_SERVER(inode)->change_attr_type; |
| 1809 | |
| 1810 | if (ctype != NFS4_CHANGE_TYPE_IS_UNDEFINED && |
| 1811 | !(cache_validity & NFS_INO_INVALID_CHANGE) && |
| 1812 | (cache_validity & check_valid) != 0 && |
| 1813 | (fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && |
| 1814 | nfs_inode_attrs_cmp_monotonic(fattr, inode) == 0) |
| 1815 | return 1; |
| 1816 | return 0; |
| 1817 | } |
| 1818 | |
| 1819 | static void nfs_ooo_merge(struct nfs_inode *nfsi, |
| 1820 | u64 start, u64 end) |
| 1821 | { |
| 1822 | int i, cnt; |
| 1823 | |
| 1824 | if (nfsi->cache_validity & NFS_INO_DATA_INVAL_DEFER) |
| 1825 | /* No point merging anything */ |
| 1826 | return; |
| 1827 | |
| 1828 | if (!nfsi->ooo) { |
| 1829 | nfsi->ooo = kmalloc(sizeof(*nfsi->ooo), GFP_ATOMIC); |
| 1830 | if (!nfsi->ooo) { |
| 1831 | nfsi->cache_validity |= NFS_INO_DATA_INVAL_DEFER; |
| 1832 | return; |
| 1833 | } |
| 1834 | nfsi->ooo->cnt = 0; |
| 1835 | } |
| 1836 | |
| 1837 | /* add this range, merging if possible */ |
| 1838 | cnt = nfsi->ooo->cnt; |
| 1839 | for (i = 0; i < cnt; i++) { |
| 1840 | if (end == nfsi->ooo->gap[i].start) |
| 1841 | end = nfsi->ooo->gap[i].end; |
| 1842 | else if (start == nfsi->ooo->gap[i].end) |
| 1843 | start = nfsi->ooo->gap[i].start; |
| 1844 | else |
| 1845 | continue; |
| 1846 | /* Remove 'i' from table and loop to insert the new range */ |
| 1847 | cnt -= 1; |
| 1848 | nfsi->ooo->gap[i] = nfsi->ooo->gap[cnt]; |
| 1849 | i = -1; |
| 1850 | } |
| 1851 | if (start != end) { |
| 1852 | if (cnt >= ARRAY_SIZE(nfsi->ooo->gap)) { |
| 1853 | nfsi->cache_validity |= NFS_INO_DATA_INVAL_DEFER; |
| 1854 | kfree(nfsi->ooo); |
| 1855 | nfsi->ooo = NULL; |
| 1856 | return; |
| 1857 | } |
| 1858 | nfsi->ooo->gap[cnt].start = start; |
| 1859 | nfsi->ooo->gap[cnt].end = end; |
| 1860 | cnt += 1; |
| 1861 | } |
| 1862 | nfsi->ooo->cnt = cnt; |
| 1863 | } |
| 1864 | |
| 1865 | static void nfs_ooo_record(struct nfs_inode *nfsi, |
| 1866 | struct nfs_fattr *fattr) |
| 1867 | { |
| 1868 | /* This reply was out-of-order, so record in the |
| 1869 | * pre/post change id, possibly cancelling |
| 1870 | * gaps created when iversion was jumpped forward. |
| 1871 | */ |
| 1872 | if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) && |
| 1873 | (fattr->valid & NFS_ATTR_FATTR_PRECHANGE)) |
| 1874 | nfs_ooo_merge(nfsi, |
| 1875 | fattr->change_attr, |
| 1876 | fattr->pre_change_attr); |
| 1877 | } |
| 1878 | |
| 1879 | static int nfs_refresh_inode_locked(struct inode *inode, |
| 1880 | struct nfs_fattr *fattr) |
| 1881 | { |
| 1882 | int attr_cmp = nfs_inode_attrs_cmp(fattr, inode); |
| 1883 | int ret = 0; |
| 1884 | |
| 1885 | trace_nfs_refresh_inode_enter(inode); |
| 1886 | |
| 1887 | if (attr_cmp > 0 || nfs_inode_finish_partial_attr_update(fattr, inode)) |
| 1888 | ret = nfs_update_inode(inode, fattr); |
| 1889 | else { |
| 1890 | nfs_ooo_record(NFS_I(inode), fattr); |
| 1891 | |
| 1892 | if (attr_cmp == 0) |
| 1893 | ret = nfs_check_inode_attributes(inode, fattr); |
| 1894 | } |
| 1895 | |
| 1896 | trace_nfs_refresh_inode_exit(inode, ret); |
| 1897 | return ret; |
| 1898 | } |
| 1899 | |
| 1900 | /** |
| 1901 | * nfs_refresh_inode - try to update the inode attribute cache |
| 1902 | * @inode: pointer to inode |
| 1903 | * @fattr: updated attributes |
| 1904 | * |
| 1905 | * Check that an RPC call that returned attributes has not overlapped with |
| 1906 | * other recent updates of the inode metadata, then decide whether it is |
| 1907 | * safe to do a full update of the inode attributes, or whether just to |
| 1908 | * call nfs_check_inode_attributes. |
| 1909 | */ |
| 1910 | int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr) |
| 1911 | { |
| 1912 | int status; |
| 1913 | |
| 1914 | if ((fattr->valid & NFS_ATTR_FATTR) == 0) |
| 1915 | return 0; |
| 1916 | spin_lock(&inode->i_lock); |
| 1917 | status = nfs_refresh_inode_locked(inode, fattr); |
| 1918 | spin_unlock(&inode->i_lock); |
| 1919 | |
| 1920 | return status; |
| 1921 | } |
| 1922 | EXPORT_SYMBOL_GPL(nfs_refresh_inode); |
| 1923 | |
| 1924 | static int nfs_post_op_update_inode_locked(struct inode *inode, |
| 1925 | struct nfs_fattr *fattr, unsigned int invalid) |
| 1926 | { |
| 1927 | if (S_ISDIR(inode->i_mode)) |
| 1928 | invalid |= NFS_INO_INVALID_DATA; |
| 1929 | nfs_set_cache_invalid(inode, invalid); |
| 1930 | if ((fattr->valid & NFS_ATTR_FATTR) == 0) |
| 1931 | return 0; |
| 1932 | return nfs_refresh_inode_locked(inode, fattr); |
| 1933 | } |
| 1934 | |
| 1935 | /** |
| 1936 | * nfs_post_op_update_inode - try to update the inode attribute cache |
| 1937 | * @inode: pointer to inode |
| 1938 | * @fattr: updated attributes |
| 1939 | * |
| 1940 | * After an operation that has changed the inode metadata, mark the |
| 1941 | * attribute cache as being invalid, then try to update it. |
| 1942 | * |
| 1943 | * NB: if the server didn't return any post op attributes, this |
| 1944 | * function will force the retrieval of attributes before the next |
| 1945 | * NFS request. Thus it should be used only for operations that |
| 1946 | * are expected to change one or more attributes, to avoid |
| 1947 | * unnecessary NFS requests and trips through nfs_update_inode(). |
| 1948 | */ |
| 1949 | int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr) |
| 1950 | { |
| 1951 | int status; |
| 1952 | |
| 1953 | spin_lock(&inode->i_lock); |
| 1954 | nfs_fattr_set_barrier(fattr); |
| 1955 | status = nfs_post_op_update_inode_locked(inode, fattr, |
| 1956 | NFS_INO_INVALID_CHANGE |
| 1957 | | NFS_INO_INVALID_CTIME |
| 1958 | | NFS_INO_REVAL_FORCED); |
| 1959 | spin_unlock(&inode->i_lock); |
| 1960 | |
| 1961 | return status; |
| 1962 | } |
| 1963 | EXPORT_SYMBOL_GPL(nfs_post_op_update_inode); |
| 1964 | |
| 1965 | /** |
| 1966 | * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache |
| 1967 | * @inode: pointer to inode |
| 1968 | * @fattr: updated attributes |
| 1969 | * |
| 1970 | * After an operation that has changed the inode metadata, mark the |
| 1971 | * attribute cache as being invalid, then try to update it. Fake up |
| 1972 | * weak cache consistency data, if none exist. |
| 1973 | * |
| 1974 | * This function is mainly designed to be used by the ->write_done() functions. |
| 1975 | */ |
| 1976 | int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr) |
| 1977 | { |
| 1978 | int attr_cmp = nfs_inode_attrs_cmp(fattr, inode); |
| 1979 | int status; |
| 1980 | |
| 1981 | /* Don't do a WCC update if these attributes are already stale */ |
| 1982 | if (attr_cmp < 0) |
| 1983 | return 0; |
| 1984 | if ((fattr->valid & NFS_ATTR_FATTR) == 0 || !attr_cmp) { |
| 1985 | /* Record the pre/post change info before clearing PRECHANGE */ |
| 1986 | nfs_ooo_record(NFS_I(inode), fattr); |
| 1987 | fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE |
| 1988 | | NFS_ATTR_FATTR_PRESIZE |
| 1989 | | NFS_ATTR_FATTR_PREMTIME |
| 1990 | | NFS_ATTR_FATTR_PRECTIME); |
| 1991 | goto out_noforce; |
| 1992 | } |
| 1993 | if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && |
| 1994 | (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) { |
| 1995 | fattr->pre_change_attr = inode_peek_iversion_raw(inode); |
| 1996 | fattr->valid |= NFS_ATTR_FATTR_PRECHANGE; |
| 1997 | } |
| 1998 | if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 && |
| 1999 | (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) { |
| 2000 | fattr->pre_ctime = inode_get_ctime(inode); |
| 2001 | fattr->valid |= NFS_ATTR_FATTR_PRECTIME; |
| 2002 | } |
| 2003 | if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 && |
| 2004 | (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) { |
| 2005 | fattr->pre_mtime = inode_get_mtime(inode); |
| 2006 | fattr->valid |= NFS_ATTR_FATTR_PREMTIME; |
| 2007 | } |
| 2008 | if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 && |
| 2009 | (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) { |
| 2010 | fattr->pre_size = i_size_read(inode); |
| 2011 | fattr->valid |= NFS_ATTR_FATTR_PRESIZE; |
| 2012 | } |
| 2013 | out_noforce: |
| 2014 | status = nfs_post_op_update_inode_locked(inode, fattr, |
| 2015 | NFS_INO_INVALID_CHANGE |
| 2016 | | NFS_INO_INVALID_CTIME |
| 2017 | | NFS_INO_INVALID_MTIME |
| 2018 | | NFS_INO_INVALID_BLOCKS); |
| 2019 | return status; |
| 2020 | } |
| 2021 | |
| 2022 | /** |
| 2023 | * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache |
| 2024 | * @inode: pointer to inode |
| 2025 | * @fattr: updated attributes |
| 2026 | * |
| 2027 | * After an operation that has changed the inode metadata, mark the |
| 2028 | * attribute cache as being invalid, then try to update it. Fake up |
| 2029 | * weak cache consistency data, if none exist. |
| 2030 | * |
| 2031 | * This function is mainly designed to be used by the ->write_done() functions. |
| 2032 | */ |
| 2033 | int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr) |
| 2034 | { |
| 2035 | int status; |
| 2036 | |
| 2037 | spin_lock(&inode->i_lock); |
| 2038 | nfs_fattr_set_barrier(fattr); |
| 2039 | status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr); |
| 2040 | spin_unlock(&inode->i_lock); |
| 2041 | return status; |
| 2042 | } |
| 2043 | EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc); |
| 2044 | |
| 2045 | |
| 2046 | /* |
| 2047 | * Many nfs protocol calls return the new file attributes after |
| 2048 | * an operation. Here we update the inode to reflect the state |
| 2049 | * of the server's inode. |
| 2050 | * |
| 2051 | * This is a bit tricky because we have to make sure all dirty pages |
| 2052 | * have been sent off to the server before calling invalidate_inode_pages. |
| 2053 | * To make sure no other process adds more write requests while we try |
| 2054 | * our best to flush them, we make them sleep during the attribute refresh. |
| 2055 | * |
| 2056 | * A very similar scenario holds for the dir cache. |
| 2057 | */ |
| 2058 | static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr) |
| 2059 | { |
| 2060 | struct nfs_server *server = NFS_SERVER(inode); |
| 2061 | struct nfs_inode *nfsi = NFS_I(inode); |
| 2062 | loff_t cur_isize, new_isize; |
| 2063 | u64 fattr_supported = server->fattr_valid; |
| 2064 | unsigned long invalid = 0; |
| 2065 | unsigned long now = jiffies; |
| 2066 | unsigned long save_cache_validity; |
| 2067 | bool have_writers = nfs_file_has_buffered_writers(nfsi); |
| 2068 | bool cache_revalidated = true; |
| 2069 | bool attr_changed = false; |
| 2070 | bool have_delegation; |
| 2071 | |
| 2072 | dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n", |
| 2073 | __func__, inode->i_sb->s_id, inode->i_ino, |
| 2074 | nfs_display_fhandle_hash(NFS_FH(inode)), |
| 2075 | atomic_read(&inode->i_count), fattr->valid); |
| 2076 | |
| 2077 | if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) { |
| 2078 | /* Only a mounted-on-fileid? Just exit */ |
| 2079 | if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) |
| 2080 | return 0; |
| 2081 | /* Has the inode gone and changed behind our back? */ |
| 2082 | } else if (nfsi->fileid != fattr->fileid) { |
| 2083 | /* Is this perhaps the mounted-on fileid? */ |
| 2084 | if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) && |
| 2085 | nfsi->fileid == fattr->mounted_on_fileid) |
| 2086 | return 0; |
| 2087 | printk(KERN_ERR "NFS: server %s error: fileid changed\n" |
| 2088 | "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n", |
| 2089 | NFS_SERVER(inode)->nfs_client->cl_hostname, |
| 2090 | inode->i_sb->s_id, (long long)nfsi->fileid, |
| 2091 | (long long)fattr->fileid); |
| 2092 | goto out_err; |
| 2093 | } |
| 2094 | |
| 2095 | /* |
| 2096 | * Make sure the inode's type hasn't changed. |
| 2097 | */ |
| 2098 | if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && inode_wrong_type(inode, fattr->mode)) { |
| 2099 | /* |
| 2100 | * Big trouble! The inode has become a different object. |
| 2101 | */ |
| 2102 | printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n", |
| 2103 | __func__, inode->i_ino, inode->i_mode, fattr->mode); |
| 2104 | goto out_err; |
| 2105 | } |
| 2106 | |
| 2107 | /* Update the fsid? */ |
| 2108 | if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) && |
| 2109 | !nfs_fsid_equal(&server->fsid, &fattr->fsid) && |
| 2110 | !IS_AUTOMOUNT(inode)) |
| 2111 | server->fsid = fattr->fsid; |
| 2112 | |
| 2113 | /* Save the delegation state before clearing cache_validity */ |
| 2114 | have_delegation = nfs_have_delegated_attributes(inode); |
| 2115 | |
| 2116 | /* |
| 2117 | * Update the read time so we don't revalidate too often. |
| 2118 | */ |
| 2119 | nfsi->read_cache_jiffies = fattr->time_start; |
| 2120 | |
| 2121 | save_cache_validity = nfsi->cache_validity; |
| 2122 | nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR |
| 2123 | | NFS_INO_INVALID_ATIME |
| 2124 | | NFS_INO_REVAL_FORCED |
| 2125 | | NFS_INO_INVALID_BLOCKS); |
| 2126 | |
| 2127 | /* Do atomic weak cache consistency updates */ |
| 2128 | nfs_wcc_update_inode(inode, fattr); |
| 2129 | |
| 2130 | if (pnfs_layoutcommit_outstanding(inode)) { |
| 2131 | nfsi->cache_validity |= |
| 2132 | save_cache_validity & |
| 2133 | (NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_CTIME | |
| 2134 | NFS_INO_INVALID_MTIME | NFS_INO_INVALID_SIZE | |
| 2135 | NFS_INO_INVALID_BLOCKS); |
| 2136 | cache_revalidated = false; |
| 2137 | } |
| 2138 | |
| 2139 | /* More cache consistency checks */ |
| 2140 | if (fattr->valid & NFS_ATTR_FATTR_CHANGE) { |
| 2141 | if (!have_writers && nfsi->ooo && nfsi->ooo->cnt == 1 && |
| 2142 | nfsi->ooo->gap[0].end == inode_peek_iversion_raw(inode)) { |
| 2143 | /* There is one remaining gap that hasn't been |
| 2144 | * merged into iversion - do that now. |
| 2145 | */ |
| 2146 | inode_set_iversion_raw(inode, nfsi->ooo->gap[0].start); |
| 2147 | kfree(nfsi->ooo); |
| 2148 | nfsi->ooo = NULL; |
| 2149 | } |
| 2150 | if (!inode_eq_iversion_raw(inode, fattr->change_attr)) { |
| 2151 | /* Could it be a race with writeback? */ |
| 2152 | if (!(have_writers || have_delegation)) { |
| 2153 | invalid |= NFS_INO_INVALID_DATA |
| 2154 | | NFS_INO_INVALID_ACCESS |
| 2155 | | NFS_INO_INVALID_ACL |
| 2156 | | NFS_INO_INVALID_XATTR; |
| 2157 | /* Force revalidate of all attributes */ |
| 2158 | save_cache_validity |= NFS_INO_INVALID_CTIME |
| 2159 | | NFS_INO_INVALID_MTIME |
| 2160 | | NFS_INO_INVALID_SIZE |
| 2161 | | NFS_INO_INVALID_BLOCKS |
| 2162 | | NFS_INO_INVALID_NLINK |
| 2163 | | NFS_INO_INVALID_MODE |
| 2164 | | NFS_INO_INVALID_OTHER; |
| 2165 | if (S_ISDIR(inode->i_mode)) |
| 2166 | nfs_force_lookup_revalidate(inode); |
| 2167 | attr_changed = true; |
| 2168 | dprintk("NFS: change_attr change on server for file %s/%ld\n", |
| 2169 | inode->i_sb->s_id, |
| 2170 | inode->i_ino); |
| 2171 | } else if (!have_delegation) { |
| 2172 | nfs_ooo_record(nfsi, fattr); |
| 2173 | nfs_ooo_merge(nfsi, inode_peek_iversion_raw(inode), |
| 2174 | fattr->change_attr); |
| 2175 | } |
| 2176 | inode_set_iversion_raw(inode, fattr->change_attr); |
| 2177 | } |
| 2178 | } else { |
| 2179 | nfsi->cache_validity |= |
| 2180 | save_cache_validity & NFS_INO_INVALID_CHANGE; |
| 2181 | if (!have_delegation || |
| 2182 | (nfsi->cache_validity & NFS_INO_INVALID_CHANGE) != 0) |
| 2183 | cache_revalidated = false; |
| 2184 | } |
| 2185 | |
| 2186 | if (fattr->valid & NFS_ATTR_FATTR_MTIME) |
| 2187 | inode_set_mtime_to_ts(inode, fattr->mtime); |
| 2188 | else if (fattr_supported & NFS_ATTR_FATTR_MTIME) |
| 2189 | nfsi->cache_validity |= |
| 2190 | save_cache_validity & NFS_INO_INVALID_MTIME; |
| 2191 | |
| 2192 | if (fattr->valid & NFS_ATTR_FATTR_CTIME) |
| 2193 | inode_set_ctime_to_ts(inode, fattr->ctime); |
| 2194 | else if (fattr_supported & NFS_ATTR_FATTR_CTIME) |
| 2195 | nfsi->cache_validity |= |
| 2196 | save_cache_validity & NFS_INO_INVALID_CTIME; |
| 2197 | |
| 2198 | /* Check if our cached file size is stale */ |
| 2199 | if (fattr->valid & NFS_ATTR_FATTR_SIZE) { |
| 2200 | new_isize = nfs_size_to_loff_t(fattr->size); |
| 2201 | cur_isize = i_size_read(inode); |
| 2202 | if (new_isize != cur_isize && !have_delegation) { |
| 2203 | /* Do we perhaps have any outstanding writes, or has |
| 2204 | * the file grown beyond our last write? */ |
| 2205 | if (!nfs_have_writebacks(inode) || new_isize > cur_isize) { |
| 2206 | trace_nfs_size_update(inode, new_isize); |
| 2207 | i_size_write(inode, new_isize); |
| 2208 | if (!have_writers) |
| 2209 | invalid |= NFS_INO_INVALID_DATA; |
| 2210 | } |
| 2211 | } |
| 2212 | if (new_isize == 0 && |
| 2213 | !(fattr->valid & (NFS_ATTR_FATTR_SPACE_USED | |
| 2214 | NFS_ATTR_FATTR_BLOCKS_USED))) { |
| 2215 | fattr->du.nfs3.used = 0; |
| 2216 | fattr->valid |= NFS_ATTR_FATTR_SPACE_USED; |
| 2217 | } |
| 2218 | } else |
| 2219 | nfsi->cache_validity |= |
| 2220 | save_cache_validity & NFS_INO_INVALID_SIZE; |
| 2221 | |
| 2222 | if (fattr->valid & NFS_ATTR_FATTR_ATIME) |
| 2223 | inode_set_atime_to_ts(inode, fattr->atime); |
| 2224 | else if (fattr_supported & NFS_ATTR_FATTR_ATIME) |
| 2225 | nfsi->cache_validity |= |
| 2226 | save_cache_validity & NFS_INO_INVALID_ATIME; |
| 2227 | |
| 2228 | if (fattr->valid & NFS_ATTR_FATTR_MODE) { |
| 2229 | if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) { |
| 2230 | umode_t newmode = inode->i_mode & S_IFMT; |
| 2231 | newmode |= fattr->mode & S_IALLUGO; |
| 2232 | inode->i_mode = newmode; |
| 2233 | invalid |= NFS_INO_INVALID_ACCESS |
| 2234 | | NFS_INO_INVALID_ACL; |
| 2235 | } |
| 2236 | } else if (fattr_supported & NFS_ATTR_FATTR_MODE) |
| 2237 | nfsi->cache_validity |= |
| 2238 | save_cache_validity & NFS_INO_INVALID_MODE; |
| 2239 | |
| 2240 | if (fattr->valid & NFS_ATTR_FATTR_OWNER) { |
| 2241 | if (!uid_eq(inode->i_uid, fattr->uid)) { |
| 2242 | invalid |= NFS_INO_INVALID_ACCESS |
| 2243 | | NFS_INO_INVALID_ACL; |
| 2244 | inode->i_uid = fattr->uid; |
| 2245 | } |
| 2246 | } else if (fattr_supported & NFS_ATTR_FATTR_OWNER) |
| 2247 | nfsi->cache_validity |= |
| 2248 | save_cache_validity & NFS_INO_INVALID_OTHER; |
| 2249 | |
| 2250 | if (fattr->valid & NFS_ATTR_FATTR_GROUP) { |
| 2251 | if (!gid_eq(inode->i_gid, fattr->gid)) { |
| 2252 | invalid |= NFS_INO_INVALID_ACCESS |
| 2253 | | NFS_INO_INVALID_ACL; |
| 2254 | inode->i_gid = fattr->gid; |
| 2255 | } |
| 2256 | } else if (fattr_supported & NFS_ATTR_FATTR_GROUP) |
| 2257 | nfsi->cache_validity |= |
| 2258 | save_cache_validity & NFS_INO_INVALID_OTHER; |
| 2259 | |
| 2260 | if (fattr->valid & NFS_ATTR_FATTR_NLINK) { |
| 2261 | if (inode->i_nlink != fattr->nlink) |
| 2262 | set_nlink(inode, fattr->nlink); |
| 2263 | } else if (fattr_supported & NFS_ATTR_FATTR_NLINK) |
| 2264 | nfsi->cache_validity |= |
| 2265 | save_cache_validity & NFS_INO_INVALID_NLINK; |
| 2266 | |
| 2267 | if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) { |
| 2268 | /* |
| 2269 | * report the blocks in 512byte units |
| 2270 | */ |
| 2271 | inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used); |
| 2272 | } else if (fattr_supported & NFS_ATTR_FATTR_SPACE_USED) |
| 2273 | nfsi->cache_validity |= |
| 2274 | save_cache_validity & NFS_INO_INVALID_BLOCKS; |
| 2275 | |
| 2276 | if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED) |
| 2277 | inode->i_blocks = fattr->du.nfs2.blocks; |
| 2278 | else if (fattr_supported & NFS_ATTR_FATTR_BLOCKS_USED) |
| 2279 | nfsi->cache_validity |= |
| 2280 | save_cache_validity & NFS_INO_INVALID_BLOCKS; |
| 2281 | |
| 2282 | /* Update attrtimeo value if we're out of the unstable period */ |
| 2283 | if (attr_changed) { |
| 2284 | nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE); |
| 2285 | nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); |
| 2286 | nfsi->attrtimeo_timestamp = now; |
| 2287 | /* Set barrier to be more recent than all outstanding updates */ |
| 2288 | nfsi->attr_gencount = nfs_inc_attr_generation_counter(); |
| 2289 | } else { |
| 2290 | if (cache_revalidated) { |
| 2291 | if (!time_in_range_open(now, nfsi->attrtimeo_timestamp, |
| 2292 | nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) { |
| 2293 | nfsi->attrtimeo <<= 1; |
| 2294 | if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode)) |
| 2295 | nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode); |
| 2296 | } |
| 2297 | nfsi->attrtimeo_timestamp = now; |
| 2298 | } |
| 2299 | /* Set the barrier to be more recent than this fattr */ |
| 2300 | if ((long)(fattr->gencount - nfsi->attr_gencount) > 0) |
| 2301 | nfsi->attr_gencount = fattr->gencount; |
| 2302 | } |
| 2303 | |
| 2304 | /* Don't invalidate the data if we were to blame */ |
| 2305 | if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) |
| 2306 | || S_ISLNK(inode->i_mode))) |
| 2307 | invalid &= ~NFS_INO_INVALID_DATA; |
| 2308 | nfs_set_cache_invalid(inode, invalid); |
| 2309 | |
| 2310 | return 0; |
| 2311 | out_err: |
| 2312 | /* |
| 2313 | * No need to worry about unhashing the dentry, as the |
| 2314 | * lookup validation will know that the inode is bad. |
| 2315 | * (But we fall through to invalidate the caches.) |
| 2316 | */ |
| 2317 | nfs_set_inode_stale_locked(inode); |
| 2318 | return -ESTALE; |
| 2319 | } |
| 2320 | |
| 2321 | struct inode *nfs_alloc_inode(struct super_block *sb) |
| 2322 | { |
| 2323 | struct nfs_inode *nfsi; |
| 2324 | nfsi = alloc_inode_sb(sb, nfs_inode_cachep, GFP_KERNEL); |
| 2325 | if (!nfsi) |
| 2326 | return NULL; |
| 2327 | nfsi->flags = 0UL; |
| 2328 | nfsi->cache_validity = 0UL; |
| 2329 | nfsi->ooo = NULL; |
| 2330 | #if IS_ENABLED(CONFIG_NFS_V4) |
| 2331 | nfsi->nfs4_acl = NULL; |
| 2332 | #endif /* CONFIG_NFS_V4 */ |
| 2333 | #ifdef CONFIG_NFS_V4_2 |
| 2334 | nfsi->xattr_cache = NULL; |
| 2335 | #endif |
| 2336 | nfs_netfs_inode_init(nfsi); |
| 2337 | |
| 2338 | return &nfsi->vfs_inode; |
| 2339 | } |
| 2340 | EXPORT_SYMBOL_GPL(nfs_alloc_inode); |
| 2341 | |
| 2342 | void nfs_free_inode(struct inode *inode) |
| 2343 | { |
| 2344 | kfree(NFS_I(inode)->ooo); |
| 2345 | kmem_cache_free(nfs_inode_cachep, NFS_I(inode)); |
| 2346 | } |
| 2347 | EXPORT_SYMBOL_GPL(nfs_free_inode); |
| 2348 | |
| 2349 | static inline void nfs4_init_once(struct nfs_inode *nfsi) |
| 2350 | { |
| 2351 | #if IS_ENABLED(CONFIG_NFS_V4) |
| 2352 | INIT_LIST_HEAD(&nfsi->open_states); |
| 2353 | nfsi->delegation = NULL; |
| 2354 | init_rwsem(&nfsi->rwsem); |
| 2355 | nfsi->layout = NULL; |
| 2356 | #endif |
| 2357 | } |
| 2358 | |
| 2359 | static void init_once(void *foo) |
| 2360 | { |
| 2361 | struct nfs_inode *nfsi = foo; |
| 2362 | |
| 2363 | inode_init_once(&nfsi->vfs_inode); |
| 2364 | INIT_LIST_HEAD(&nfsi->open_files); |
| 2365 | INIT_LIST_HEAD(&nfsi->access_cache_entry_lru); |
| 2366 | INIT_LIST_HEAD(&nfsi->access_cache_inode_lru); |
| 2367 | nfs4_init_once(nfsi); |
| 2368 | } |
| 2369 | |
| 2370 | static int __init nfs_init_inodecache(void) |
| 2371 | { |
| 2372 | nfs_inode_cachep = kmem_cache_create("nfs_inode_cache", |
| 2373 | sizeof(struct nfs_inode), |
| 2374 | 0, (SLAB_RECLAIM_ACCOUNT| |
| 2375 | SLAB_ACCOUNT), |
| 2376 | init_once); |
| 2377 | if (nfs_inode_cachep == NULL) |
| 2378 | return -ENOMEM; |
| 2379 | |
| 2380 | return 0; |
| 2381 | } |
| 2382 | |
| 2383 | static void nfs_destroy_inodecache(void) |
| 2384 | { |
| 2385 | /* |
| 2386 | * Make sure all delayed rcu free inodes are flushed before we |
| 2387 | * destroy cache. |
| 2388 | */ |
| 2389 | rcu_barrier(); |
| 2390 | kmem_cache_destroy(nfs_inode_cachep); |
| 2391 | } |
| 2392 | |
| 2393 | struct workqueue_struct *nfsiod_workqueue; |
| 2394 | EXPORT_SYMBOL_GPL(nfsiod_workqueue); |
| 2395 | |
| 2396 | /* |
| 2397 | * start up the nfsiod workqueue |
| 2398 | */ |
| 2399 | static int nfsiod_start(void) |
| 2400 | { |
| 2401 | struct workqueue_struct *wq; |
| 2402 | dprintk("RPC: creating workqueue nfsiod\n"); |
| 2403 | wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM | WQ_UNBOUND, 0); |
| 2404 | if (wq == NULL) |
| 2405 | return -ENOMEM; |
| 2406 | nfsiod_workqueue = wq; |
| 2407 | return 0; |
| 2408 | } |
| 2409 | |
| 2410 | /* |
| 2411 | * Destroy the nfsiod workqueue |
| 2412 | */ |
| 2413 | static void nfsiod_stop(void) |
| 2414 | { |
| 2415 | struct workqueue_struct *wq; |
| 2416 | |
| 2417 | wq = nfsiod_workqueue; |
| 2418 | if (wq == NULL) |
| 2419 | return; |
| 2420 | nfsiod_workqueue = NULL; |
| 2421 | destroy_workqueue(wq); |
| 2422 | } |
| 2423 | |
| 2424 | unsigned int nfs_net_id; |
| 2425 | EXPORT_SYMBOL_GPL(nfs_net_id); |
| 2426 | |
| 2427 | static int nfs_net_init(struct net *net) |
| 2428 | { |
| 2429 | struct nfs_net *nn = net_generic(net, nfs_net_id); |
| 2430 | |
| 2431 | nfs_clients_init(net); |
| 2432 | |
| 2433 | if (!rpc_proc_register(net, &nn->rpcstats)) { |
| 2434 | nfs_clients_exit(net); |
| 2435 | return -ENOMEM; |
| 2436 | } |
| 2437 | |
| 2438 | return nfs_fs_proc_net_init(net); |
| 2439 | } |
| 2440 | |
| 2441 | static void nfs_net_exit(struct net *net) |
| 2442 | { |
| 2443 | rpc_proc_unregister(net, "nfs"); |
| 2444 | nfs_fs_proc_net_exit(net); |
| 2445 | nfs_clients_exit(net); |
| 2446 | } |
| 2447 | |
| 2448 | static struct pernet_operations nfs_net_ops = { |
| 2449 | .init = nfs_net_init, |
| 2450 | .exit = nfs_net_exit, |
| 2451 | .id = &nfs_net_id, |
| 2452 | .size = sizeof(struct nfs_net), |
| 2453 | }; |
| 2454 | |
| 2455 | /* |
| 2456 | * Initialize NFS |
| 2457 | */ |
| 2458 | static int __init init_nfs_fs(void) |
| 2459 | { |
| 2460 | int err; |
| 2461 | |
| 2462 | err = nfs_sysfs_init(); |
| 2463 | if (err < 0) |
| 2464 | goto out10; |
| 2465 | |
| 2466 | err = register_pernet_subsys(&nfs_net_ops); |
| 2467 | if (err < 0) |
| 2468 | goto out9; |
| 2469 | |
| 2470 | err = nfsiod_start(); |
| 2471 | if (err) |
| 2472 | goto out7; |
| 2473 | |
| 2474 | err = nfs_fs_proc_init(); |
| 2475 | if (err) |
| 2476 | goto out6; |
| 2477 | |
| 2478 | err = nfs_init_nfspagecache(); |
| 2479 | if (err) |
| 2480 | goto out5; |
| 2481 | |
| 2482 | err = nfs_init_inodecache(); |
| 2483 | if (err) |
| 2484 | goto out4; |
| 2485 | |
| 2486 | err = nfs_init_readpagecache(); |
| 2487 | if (err) |
| 2488 | goto out3; |
| 2489 | |
| 2490 | err = nfs_init_writepagecache(); |
| 2491 | if (err) |
| 2492 | goto out2; |
| 2493 | |
| 2494 | err = nfs_init_directcache(); |
| 2495 | if (err) |
| 2496 | goto out1; |
| 2497 | |
| 2498 | err = register_nfs_fs(); |
| 2499 | if (err) |
| 2500 | goto out0; |
| 2501 | |
| 2502 | return 0; |
| 2503 | out0: |
| 2504 | nfs_destroy_directcache(); |
| 2505 | out1: |
| 2506 | nfs_destroy_writepagecache(); |
| 2507 | out2: |
| 2508 | nfs_destroy_readpagecache(); |
| 2509 | out3: |
| 2510 | nfs_destroy_inodecache(); |
| 2511 | out4: |
| 2512 | nfs_destroy_nfspagecache(); |
| 2513 | out5: |
| 2514 | nfs_fs_proc_exit(); |
| 2515 | out6: |
| 2516 | nfsiod_stop(); |
| 2517 | out7: |
| 2518 | unregister_pernet_subsys(&nfs_net_ops); |
| 2519 | out9: |
| 2520 | nfs_sysfs_exit(); |
| 2521 | out10: |
| 2522 | return err; |
| 2523 | } |
| 2524 | |
| 2525 | static void __exit exit_nfs_fs(void) |
| 2526 | { |
| 2527 | nfs_destroy_directcache(); |
| 2528 | nfs_destroy_writepagecache(); |
| 2529 | nfs_destroy_readpagecache(); |
| 2530 | nfs_destroy_inodecache(); |
| 2531 | nfs_destroy_nfspagecache(); |
| 2532 | unregister_pernet_subsys(&nfs_net_ops); |
| 2533 | unregister_nfs_fs(); |
| 2534 | nfs_fs_proc_exit(); |
| 2535 | nfsiod_stop(); |
| 2536 | nfs_sysfs_exit(); |
| 2537 | } |
| 2538 | |
| 2539 | /* Not quite true; I just maintain it */ |
| 2540 | MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); |
| 2541 | MODULE_LICENSE("GPL"); |
| 2542 | module_param(enable_ino64, bool, 0644); |
| 2543 | |
| 2544 | module_init(init_nfs_fs) |
| 2545 | module_exit(exit_nfs_fs) |