| 1 | /* |
| 2 | * linux/fs/nfs/inode.c |
| 3 | * |
| 4 | * Copyright (C) 1992 Rick Sladkey |
| 5 | * |
| 6 | * nfs inode and superblock handling functions |
| 7 | * |
| 8 | * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some |
| 9 | * experimental NFS changes. Modularisation taken straight from SYS5 fs. |
| 10 | * |
| 11 | * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts. |
| 12 | * J.S.Peatfield@damtp.cam.ac.uk |
| 13 | * |
| 14 | */ |
| 15 | |
| 16 | #include <linux/module.h> |
| 17 | #include <linux/init.h> |
| 18 | #include <linux/sched.h> |
| 19 | #include <linux/time.h> |
| 20 | #include <linux/kernel.h> |
| 21 | #include <linux/mm.h> |
| 22 | #include <linux/string.h> |
| 23 | #include <linux/stat.h> |
| 24 | #include <linux/errno.h> |
| 25 | #include <linux/unistd.h> |
| 26 | #include <linux/sunrpc/clnt.h> |
| 27 | #include <linux/sunrpc/stats.h> |
| 28 | #include <linux/sunrpc/metrics.h> |
| 29 | #include <linux/nfs_fs.h> |
| 30 | #include <linux/nfs_mount.h> |
| 31 | #include <linux/nfs4_mount.h> |
| 32 | #include <linux/lockd/bind.h> |
| 33 | #include <linux/seq_file.h> |
| 34 | #include <linux/mount.h> |
| 35 | #include <linux/nfs_idmap.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 | |
| 42 | #include <asm/system.h> |
| 43 | #include <asm/uaccess.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 "dns_resolve.h" |
| 52 | #include "pnfs.h" |
| 53 | |
| 54 | #define NFSDBG_FACILITY NFSDBG_VFS |
| 55 | |
| 56 | #define NFS_64_BIT_INODE_NUMBERS_ENABLED 1 |
| 57 | |
| 58 | /* Default is to see 64-bit inode numbers */ |
| 59 | static int enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED; |
| 60 | |
| 61 | static void nfs_invalidate_inode(struct inode *); |
| 62 | static int nfs_update_inode(struct inode *, struct nfs_fattr *); |
| 63 | |
| 64 | static struct kmem_cache * nfs_inode_cachep; |
| 65 | |
| 66 | static inline unsigned long |
| 67 | nfs_fattr_to_ino_t(struct nfs_fattr *fattr) |
| 68 | { |
| 69 | return nfs_fileid_to_ino_t(fattr->fileid); |
| 70 | } |
| 71 | |
| 72 | /** |
| 73 | * nfs_wait_bit_killable - helper for functions that are sleeping on bit locks |
| 74 | * @word: long word containing the bit lock |
| 75 | */ |
| 76 | int nfs_wait_bit_killable(void *word) |
| 77 | { |
| 78 | if (fatal_signal_pending(current)) |
| 79 | return -ERESTARTSYS; |
| 80 | schedule(); |
| 81 | return 0; |
| 82 | } |
| 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 | static void nfs_clear_inode(struct inode *inode) |
| 108 | { |
| 109 | /* |
| 110 | * The following should never happen... |
| 111 | */ |
| 112 | BUG_ON(nfs_have_writebacks(inode)); |
| 113 | BUG_ON(!list_empty(&NFS_I(inode)->open_files)); |
| 114 | nfs_zap_acl_cache(inode); |
| 115 | nfs_access_zap_cache(inode); |
| 116 | nfs_fscache_release_inode_cookie(inode); |
| 117 | } |
| 118 | |
| 119 | void nfs_evict_inode(struct inode *inode) |
| 120 | { |
| 121 | truncate_inode_pages(&inode->i_data, 0); |
| 122 | end_writeback(inode); |
| 123 | nfs_clear_inode(inode); |
| 124 | } |
| 125 | |
| 126 | /** |
| 127 | * nfs_sync_mapping - helper to flush all mmapped dirty data to disk |
| 128 | */ |
| 129 | int nfs_sync_mapping(struct address_space *mapping) |
| 130 | { |
| 131 | int ret = 0; |
| 132 | |
| 133 | if (mapping->nrpages != 0) { |
| 134 | unmap_mapping_range(mapping, 0, 0, 0); |
| 135 | ret = nfs_wb_all(mapping->host); |
| 136 | } |
| 137 | return ret; |
| 138 | } |
| 139 | |
| 140 | /* |
| 141 | * Invalidate the local caches |
| 142 | */ |
| 143 | static void nfs_zap_caches_locked(struct inode *inode) |
| 144 | { |
| 145 | struct nfs_inode *nfsi = NFS_I(inode); |
| 146 | int mode = inode->i_mode; |
| 147 | |
| 148 | nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE); |
| 149 | |
| 150 | nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); |
| 151 | nfsi->attrtimeo_timestamp = jiffies; |
| 152 | |
| 153 | memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode))); |
| 154 | if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) |
| 155 | nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE; |
| 156 | else |
| 157 | nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE; |
| 158 | } |
| 159 | |
| 160 | void nfs_zap_caches(struct inode *inode) |
| 161 | { |
| 162 | spin_lock(&inode->i_lock); |
| 163 | nfs_zap_caches_locked(inode); |
| 164 | spin_unlock(&inode->i_lock); |
| 165 | } |
| 166 | |
| 167 | void nfs_zap_mapping(struct inode *inode, struct address_space *mapping) |
| 168 | { |
| 169 | if (mapping->nrpages != 0) { |
| 170 | spin_lock(&inode->i_lock); |
| 171 | NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA; |
| 172 | spin_unlock(&inode->i_lock); |
| 173 | } |
| 174 | } |
| 175 | |
| 176 | void nfs_zap_acl_cache(struct inode *inode) |
| 177 | { |
| 178 | void (*clear_acl_cache)(struct inode *); |
| 179 | |
| 180 | clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache; |
| 181 | if (clear_acl_cache != NULL) |
| 182 | clear_acl_cache(inode); |
| 183 | spin_lock(&inode->i_lock); |
| 184 | NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL; |
| 185 | spin_unlock(&inode->i_lock); |
| 186 | } |
| 187 | |
| 188 | void nfs_invalidate_atime(struct inode *inode) |
| 189 | { |
| 190 | spin_lock(&inode->i_lock); |
| 191 | NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATIME; |
| 192 | spin_unlock(&inode->i_lock); |
| 193 | } |
| 194 | |
| 195 | /* |
| 196 | * Invalidate, but do not unhash, the inode. |
| 197 | * NB: must be called with inode->i_lock held! |
| 198 | */ |
| 199 | static void nfs_invalidate_inode(struct inode *inode) |
| 200 | { |
| 201 | set_bit(NFS_INO_STALE, &NFS_I(inode)->flags); |
| 202 | nfs_zap_caches_locked(inode); |
| 203 | } |
| 204 | |
| 205 | struct nfs_find_desc { |
| 206 | struct nfs_fh *fh; |
| 207 | struct nfs_fattr *fattr; |
| 208 | }; |
| 209 | |
| 210 | /* |
| 211 | * In NFSv3 we can have 64bit inode numbers. In order to support |
| 212 | * this, and re-exported directories (also seen in NFSv2) |
| 213 | * we are forced to allow 2 different inodes to have the same |
| 214 | * i_ino. |
| 215 | */ |
| 216 | static int |
| 217 | nfs_find_actor(struct inode *inode, void *opaque) |
| 218 | { |
| 219 | struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque; |
| 220 | struct nfs_fh *fh = desc->fh; |
| 221 | struct nfs_fattr *fattr = desc->fattr; |
| 222 | |
| 223 | if (NFS_FILEID(inode) != fattr->fileid) |
| 224 | return 0; |
| 225 | if (nfs_compare_fh(NFS_FH(inode), fh)) |
| 226 | return 0; |
| 227 | if (is_bad_inode(inode) || NFS_STALE(inode)) |
| 228 | return 0; |
| 229 | return 1; |
| 230 | } |
| 231 | |
| 232 | static int |
| 233 | nfs_init_locked(struct inode *inode, void *opaque) |
| 234 | { |
| 235 | struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque; |
| 236 | struct nfs_fattr *fattr = desc->fattr; |
| 237 | |
| 238 | set_nfs_fileid(inode, fattr->fileid); |
| 239 | nfs_copy_fh(NFS_FH(inode), desc->fh); |
| 240 | return 0; |
| 241 | } |
| 242 | |
| 243 | /* |
| 244 | * This is our front-end to iget that looks up inodes by file handle |
| 245 | * instead of inode number. |
| 246 | */ |
| 247 | struct inode * |
| 248 | nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr) |
| 249 | { |
| 250 | struct nfs_find_desc desc = { |
| 251 | .fh = fh, |
| 252 | .fattr = fattr |
| 253 | }; |
| 254 | struct inode *inode = ERR_PTR(-ENOENT); |
| 255 | unsigned long hash; |
| 256 | |
| 257 | nfs_attr_check_mountpoint(sb, fattr); |
| 258 | |
| 259 | if (((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0) && |
| 260 | !nfs_attr_use_mounted_on_fileid(fattr)) |
| 261 | goto out_no_inode; |
| 262 | if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0) |
| 263 | goto out_no_inode; |
| 264 | |
| 265 | hash = nfs_fattr_to_ino_t(fattr); |
| 266 | |
| 267 | inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc); |
| 268 | if (inode == NULL) { |
| 269 | inode = ERR_PTR(-ENOMEM); |
| 270 | goto out_no_inode; |
| 271 | } |
| 272 | |
| 273 | if (inode->i_state & I_NEW) { |
| 274 | struct nfs_inode *nfsi = NFS_I(inode); |
| 275 | unsigned long now = jiffies; |
| 276 | |
| 277 | /* We set i_ino for the few things that still rely on it, |
| 278 | * such as stat(2) */ |
| 279 | inode->i_ino = hash; |
| 280 | |
| 281 | /* We can't support update_atime(), since the server will reset it */ |
| 282 | inode->i_flags |= S_NOATIME|S_NOCMTIME; |
| 283 | inode->i_mode = fattr->mode; |
| 284 | if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0 |
| 285 | && nfs_server_capable(inode, NFS_CAP_MODE)) |
| 286 | nfsi->cache_validity |= NFS_INO_INVALID_ATTR |
| 287 | | NFS_INO_INVALID_ACCESS |
| 288 | | NFS_INO_INVALID_ACL; |
| 289 | /* Why so? Because we want revalidate for devices/FIFOs, and |
| 290 | * that's precisely what we have in nfs_file_inode_operations. |
| 291 | */ |
| 292 | inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops; |
| 293 | if (S_ISREG(inode->i_mode)) { |
| 294 | inode->i_fop = &nfs_file_operations; |
| 295 | inode->i_data.a_ops = &nfs_file_aops; |
| 296 | inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info; |
| 297 | } else if (S_ISDIR(inode->i_mode)) { |
| 298 | inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops; |
| 299 | inode->i_fop = &nfs_dir_operations; |
| 300 | inode->i_data.a_ops = &nfs_dir_aops; |
| 301 | if (nfs_server_capable(inode, NFS_CAP_READDIRPLUS)) |
| 302 | set_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); |
| 303 | /* Deal with crossing mountpoints */ |
| 304 | if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT || |
| 305 | fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) { |
| 306 | if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) |
| 307 | inode->i_op = &nfs_referral_inode_operations; |
| 308 | else |
| 309 | inode->i_op = &nfs_mountpoint_inode_operations; |
| 310 | inode->i_fop = NULL; |
| 311 | inode->i_flags |= S_AUTOMOUNT; |
| 312 | } |
| 313 | } else if (S_ISLNK(inode->i_mode)) |
| 314 | inode->i_op = &nfs_symlink_inode_operations; |
| 315 | else |
| 316 | init_special_inode(inode, inode->i_mode, fattr->rdev); |
| 317 | |
| 318 | memset(&inode->i_atime, 0, sizeof(inode->i_atime)); |
| 319 | memset(&inode->i_mtime, 0, sizeof(inode->i_mtime)); |
| 320 | memset(&inode->i_ctime, 0, sizeof(inode->i_ctime)); |
| 321 | inode->i_version = 0; |
| 322 | inode->i_size = 0; |
| 323 | clear_nlink(inode); |
| 324 | inode->i_uid = -2; |
| 325 | inode->i_gid = -2; |
| 326 | inode->i_blocks = 0; |
| 327 | memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf)); |
| 328 | |
| 329 | nfsi->read_cache_jiffies = fattr->time_start; |
| 330 | nfsi->attr_gencount = fattr->gencount; |
| 331 | if (fattr->valid & NFS_ATTR_FATTR_ATIME) |
| 332 | inode->i_atime = fattr->atime; |
| 333 | else if (nfs_server_capable(inode, NFS_CAP_ATIME)) |
| 334 | nfsi->cache_validity |= NFS_INO_INVALID_ATTR; |
| 335 | if (fattr->valid & NFS_ATTR_FATTR_MTIME) |
| 336 | inode->i_mtime = fattr->mtime; |
| 337 | else if (nfs_server_capable(inode, NFS_CAP_MTIME)) |
| 338 | nfsi->cache_validity |= NFS_INO_INVALID_ATTR |
| 339 | | NFS_INO_INVALID_DATA; |
| 340 | if (fattr->valid & NFS_ATTR_FATTR_CTIME) |
| 341 | inode->i_ctime = fattr->ctime; |
| 342 | else if (nfs_server_capable(inode, NFS_CAP_CTIME)) |
| 343 | nfsi->cache_validity |= NFS_INO_INVALID_ATTR |
| 344 | | NFS_INO_INVALID_ACCESS |
| 345 | | NFS_INO_INVALID_ACL; |
| 346 | if (fattr->valid & NFS_ATTR_FATTR_CHANGE) |
| 347 | inode->i_version = fattr->change_attr; |
| 348 | else if (nfs_server_capable(inode, NFS_CAP_CHANGE_ATTR)) |
| 349 | nfsi->cache_validity |= NFS_INO_INVALID_ATTR |
| 350 | | NFS_INO_INVALID_DATA; |
| 351 | if (fattr->valid & NFS_ATTR_FATTR_SIZE) |
| 352 | inode->i_size = nfs_size_to_loff_t(fattr->size); |
| 353 | else |
| 354 | nfsi->cache_validity |= NFS_INO_INVALID_ATTR |
| 355 | | NFS_INO_INVALID_DATA |
| 356 | | NFS_INO_REVAL_PAGECACHE; |
| 357 | if (fattr->valid & NFS_ATTR_FATTR_NLINK) |
| 358 | set_nlink(inode, fattr->nlink); |
| 359 | else if (nfs_server_capable(inode, NFS_CAP_NLINK)) |
| 360 | nfsi->cache_validity |= NFS_INO_INVALID_ATTR; |
| 361 | if (fattr->valid & NFS_ATTR_FATTR_OWNER) |
| 362 | inode->i_uid = fattr->uid; |
| 363 | else if (nfs_server_capable(inode, NFS_CAP_OWNER)) |
| 364 | nfsi->cache_validity |= NFS_INO_INVALID_ATTR |
| 365 | | NFS_INO_INVALID_ACCESS |
| 366 | | NFS_INO_INVALID_ACL; |
| 367 | if (fattr->valid & NFS_ATTR_FATTR_GROUP) |
| 368 | inode->i_gid = fattr->gid; |
| 369 | else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP)) |
| 370 | nfsi->cache_validity |= NFS_INO_INVALID_ATTR |
| 371 | | NFS_INO_INVALID_ACCESS |
| 372 | | NFS_INO_INVALID_ACL; |
| 373 | if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED) |
| 374 | inode->i_blocks = fattr->du.nfs2.blocks; |
| 375 | if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) { |
| 376 | /* |
| 377 | * report the blocks in 512byte units |
| 378 | */ |
| 379 | inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used); |
| 380 | } |
| 381 | nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); |
| 382 | nfsi->attrtimeo_timestamp = now; |
| 383 | nfsi->access_cache = RB_ROOT; |
| 384 | |
| 385 | nfs_fscache_init_inode_cookie(inode); |
| 386 | |
| 387 | unlock_new_inode(inode); |
| 388 | } else |
| 389 | nfs_refresh_inode(inode, fattr); |
| 390 | dprintk("NFS: nfs_fhget(%s/%Ld ct=%d)\n", |
| 391 | inode->i_sb->s_id, |
| 392 | (long long)NFS_FILEID(inode), |
| 393 | atomic_read(&inode->i_count)); |
| 394 | |
| 395 | out: |
| 396 | return inode; |
| 397 | |
| 398 | out_no_inode: |
| 399 | dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode)); |
| 400 | goto out; |
| 401 | } |
| 402 | |
| 403 | #define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET|ATTR_FILE) |
| 404 | |
| 405 | int |
| 406 | nfs_setattr(struct dentry *dentry, struct iattr *attr) |
| 407 | { |
| 408 | struct inode *inode = dentry->d_inode; |
| 409 | struct nfs_fattr *fattr; |
| 410 | int error = -ENOMEM; |
| 411 | |
| 412 | nfs_inc_stats(inode, NFSIOS_VFSSETATTR); |
| 413 | |
| 414 | /* skip mode change if it's just for clearing setuid/setgid */ |
| 415 | if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) |
| 416 | attr->ia_valid &= ~ATTR_MODE; |
| 417 | |
| 418 | if (attr->ia_valid & ATTR_SIZE) { |
| 419 | if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode)) |
| 420 | attr->ia_valid &= ~ATTR_SIZE; |
| 421 | } |
| 422 | |
| 423 | /* Optimization: if the end result is no change, don't RPC */ |
| 424 | attr->ia_valid &= NFS_VALID_ATTRS; |
| 425 | if ((attr->ia_valid & ~ATTR_FILE) == 0) |
| 426 | return 0; |
| 427 | |
| 428 | /* Write all dirty data */ |
| 429 | if (S_ISREG(inode->i_mode)) |
| 430 | nfs_wb_all(inode); |
| 431 | |
| 432 | fattr = nfs_alloc_fattr(); |
| 433 | if (fattr == NULL) |
| 434 | goto out; |
| 435 | /* |
| 436 | * Return any delegations if we're going to change ACLs |
| 437 | */ |
| 438 | if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) |
| 439 | nfs_inode_return_delegation(inode); |
| 440 | error = NFS_PROTO(inode)->setattr(dentry, fattr, attr); |
| 441 | if (error == 0) |
| 442 | nfs_refresh_inode(inode, fattr); |
| 443 | nfs_free_fattr(fattr); |
| 444 | out: |
| 445 | return error; |
| 446 | } |
| 447 | |
| 448 | /** |
| 449 | * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall |
| 450 | * @inode: inode of the file used |
| 451 | * @offset: file offset to start truncating |
| 452 | * |
| 453 | * This is a copy of the common vmtruncate, but with the locking |
| 454 | * corrected to take into account the fact that NFS requires |
| 455 | * inode->i_size to be updated under the inode->i_lock. |
| 456 | */ |
| 457 | static int nfs_vmtruncate(struct inode * inode, loff_t offset) |
| 458 | { |
| 459 | loff_t oldsize; |
| 460 | int err; |
| 461 | |
| 462 | err = inode_newsize_ok(inode, offset); |
| 463 | if (err) |
| 464 | goto out; |
| 465 | |
| 466 | spin_lock(&inode->i_lock); |
| 467 | oldsize = inode->i_size; |
| 468 | i_size_write(inode, offset); |
| 469 | spin_unlock(&inode->i_lock); |
| 470 | |
| 471 | truncate_pagecache(inode, oldsize, offset); |
| 472 | out: |
| 473 | return err; |
| 474 | } |
| 475 | |
| 476 | /** |
| 477 | * nfs_setattr_update_inode - Update inode metadata after a setattr call. |
| 478 | * @inode: pointer to struct inode |
| 479 | * @attr: pointer to struct iattr |
| 480 | * |
| 481 | * Note: we do this in the *proc.c in order to ensure that |
| 482 | * it works for things like exclusive creates too. |
| 483 | */ |
| 484 | void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr) |
| 485 | { |
| 486 | if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) { |
| 487 | spin_lock(&inode->i_lock); |
| 488 | if ((attr->ia_valid & ATTR_MODE) != 0) { |
| 489 | int mode = attr->ia_mode & S_IALLUGO; |
| 490 | mode |= inode->i_mode & ~S_IALLUGO; |
| 491 | inode->i_mode = mode; |
| 492 | } |
| 493 | if ((attr->ia_valid & ATTR_UID) != 0) |
| 494 | inode->i_uid = attr->ia_uid; |
| 495 | if ((attr->ia_valid & ATTR_GID) != 0) |
| 496 | inode->i_gid = attr->ia_gid; |
| 497 | NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; |
| 498 | spin_unlock(&inode->i_lock); |
| 499 | } |
| 500 | if ((attr->ia_valid & ATTR_SIZE) != 0) { |
| 501 | nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC); |
| 502 | nfs_vmtruncate(inode, attr->ia_size); |
| 503 | } |
| 504 | } |
| 505 | |
| 506 | int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) |
| 507 | { |
| 508 | struct inode *inode = dentry->d_inode; |
| 509 | int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME; |
| 510 | int err; |
| 511 | |
| 512 | /* Flush out writes to the server in order to update c/mtime. */ |
| 513 | if (S_ISREG(inode->i_mode)) { |
| 514 | err = filemap_write_and_wait(inode->i_mapping); |
| 515 | if (err) |
| 516 | goto out; |
| 517 | } |
| 518 | |
| 519 | /* |
| 520 | * We may force a getattr if the user cares about atime. |
| 521 | * |
| 522 | * Note that we only have to check the vfsmount flags here: |
| 523 | * - NFS always sets S_NOATIME by so checking it would give a |
| 524 | * bogus result |
| 525 | * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is |
| 526 | * no point in checking those. |
| 527 | */ |
| 528 | if ((mnt->mnt_flags & MNT_NOATIME) || |
| 529 | ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode))) |
| 530 | need_atime = 0; |
| 531 | |
| 532 | if (need_atime) |
| 533 | err = __nfs_revalidate_inode(NFS_SERVER(inode), inode); |
| 534 | else |
| 535 | err = nfs_revalidate_inode(NFS_SERVER(inode), inode); |
| 536 | if (!err) { |
| 537 | generic_fillattr(inode, stat); |
| 538 | stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode)); |
| 539 | } |
| 540 | out: |
| 541 | return err; |
| 542 | } |
| 543 | |
| 544 | static void nfs_init_lock_context(struct nfs_lock_context *l_ctx) |
| 545 | { |
| 546 | atomic_set(&l_ctx->count, 1); |
| 547 | l_ctx->lockowner = current->files; |
| 548 | l_ctx->pid = current->tgid; |
| 549 | INIT_LIST_HEAD(&l_ctx->list); |
| 550 | } |
| 551 | |
| 552 | static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx) |
| 553 | { |
| 554 | struct nfs_lock_context *pos; |
| 555 | |
| 556 | list_for_each_entry(pos, &ctx->lock_context.list, list) { |
| 557 | if (pos->lockowner != current->files) |
| 558 | continue; |
| 559 | if (pos->pid != current->tgid) |
| 560 | continue; |
| 561 | atomic_inc(&pos->count); |
| 562 | return pos; |
| 563 | } |
| 564 | return NULL; |
| 565 | } |
| 566 | |
| 567 | struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx) |
| 568 | { |
| 569 | struct nfs_lock_context *res, *new = NULL; |
| 570 | struct inode *inode = ctx->dentry->d_inode; |
| 571 | |
| 572 | spin_lock(&inode->i_lock); |
| 573 | res = __nfs_find_lock_context(ctx); |
| 574 | if (res == NULL) { |
| 575 | spin_unlock(&inode->i_lock); |
| 576 | new = kmalloc(sizeof(*new), GFP_KERNEL); |
| 577 | if (new == NULL) |
| 578 | return NULL; |
| 579 | nfs_init_lock_context(new); |
| 580 | spin_lock(&inode->i_lock); |
| 581 | res = __nfs_find_lock_context(ctx); |
| 582 | if (res == NULL) { |
| 583 | list_add_tail(&new->list, &ctx->lock_context.list); |
| 584 | new->open_context = ctx; |
| 585 | res = new; |
| 586 | new = NULL; |
| 587 | } |
| 588 | } |
| 589 | spin_unlock(&inode->i_lock); |
| 590 | kfree(new); |
| 591 | return res; |
| 592 | } |
| 593 | |
| 594 | void nfs_put_lock_context(struct nfs_lock_context *l_ctx) |
| 595 | { |
| 596 | struct nfs_open_context *ctx = l_ctx->open_context; |
| 597 | struct inode *inode = ctx->dentry->d_inode; |
| 598 | |
| 599 | if (!atomic_dec_and_lock(&l_ctx->count, &inode->i_lock)) |
| 600 | return; |
| 601 | list_del(&l_ctx->list); |
| 602 | spin_unlock(&inode->i_lock); |
| 603 | kfree(l_ctx); |
| 604 | } |
| 605 | |
| 606 | /** |
| 607 | * nfs_close_context - Common close_context() routine NFSv2/v3 |
| 608 | * @ctx: pointer to context |
| 609 | * @is_sync: is this a synchronous close |
| 610 | * |
| 611 | * always ensure that the attributes are up to date if we're mounted |
| 612 | * with close-to-open semantics |
| 613 | */ |
| 614 | void nfs_close_context(struct nfs_open_context *ctx, int is_sync) |
| 615 | { |
| 616 | struct inode *inode; |
| 617 | struct nfs_server *server; |
| 618 | |
| 619 | if (!(ctx->mode & FMODE_WRITE)) |
| 620 | return; |
| 621 | if (!is_sync) |
| 622 | return; |
| 623 | inode = ctx->dentry->d_inode; |
| 624 | if (!list_empty(&NFS_I(inode)->open_files)) |
| 625 | return; |
| 626 | server = NFS_SERVER(inode); |
| 627 | if (server->flags & NFS_MOUNT_NOCTO) |
| 628 | return; |
| 629 | nfs_revalidate_inode(server, inode); |
| 630 | } |
| 631 | |
| 632 | struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, struct rpc_cred *cred, fmode_t f_mode) |
| 633 | { |
| 634 | struct nfs_open_context *ctx; |
| 635 | |
| 636 | ctx = kmalloc(sizeof(*ctx), GFP_KERNEL); |
| 637 | if (ctx != NULL) { |
| 638 | nfs_sb_active(dentry->d_sb); |
| 639 | ctx->dentry = dget(dentry); |
| 640 | ctx->cred = get_rpccred(cred); |
| 641 | ctx->state = NULL; |
| 642 | ctx->mode = f_mode; |
| 643 | ctx->flags = 0; |
| 644 | ctx->error = 0; |
| 645 | nfs_init_lock_context(&ctx->lock_context); |
| 646 | ctx->lock_context.open_context = ctx; |
| 647 | INIT_LIST_HEAD(&ctx->list); |
| 648 | } |
| 649 | return ctx; |
| 650 | } |
| 651 | |
| 652 | struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx) |
| 653 | { |
| 654 | if (ctx != NULL) |
| 655 | atomic_inc(&ctx->lock_context.count); |
| 656 | return ctx; |
| 657 | } |
| 658 | |
| 659 | static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync) |
| 660 | { |
| 661 | struct inode *inode = ctx->dentry->d_inode; |
| 662 | struct super_block *sb = ctx->dentry->d_sb; |
| 663 | |
| 664 | if (!list_empty(&ctx->list)) { |
| 665 | if (!atomic_dec_and_lock(&ctx->lock_context.count, &inode->i_lock)) |
| 666 | return; |
| 667 | list_del(&ctx->list); |
| 668 | spin_unlock(&inode->i_lock); |
| 669 | } else if (!atomic_dec_and_test(&ctx->lock_context.count)) |
| 670 | return; |
| 671 | if (inode != NULL) |
| 672 | NFS_PROTO(inode)->close_context(ctx, is_sync); |
| 673 | if (ctx->cred != NULL) |
| 674 | put_rpccred(ctx->cred); |
| 675 | dput(ctx->dentry); |
| 676 | nfs_sb_deactive(sb); |
| 677 | kfree(ctx); |
| 678 | } |
| 679 | |
| 680 | void put_nfs_open_context(struct nfs_open_context *ctx) |
| 681 | { |
| 682 | __put_nfs_open_context(ctx, 0); |
| 683 | } |
| 684 | |
| 685 | /* |
| 686 | * Ensure that mmap has a recent RPC credential for use when writing out |
| 687 | * shared pages |
| 688 | */ |
| 689 | void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx) |
| 690 | { |
| 691 | struct inode *inode = filp->f_path.dentry->d_inode; |
| 692 | struct nfs_inode *nfsi = NFS_I(inode); |
| 693 | |
| 694 | filp->private_data = get_nfs_open_context(ctx); |
| 695 | spin_lock(&inode->i_lock); |
| 696 | list_add(&ctx->list, &nfsi->open_files); |
| 697 | spin_unlock(&inode->i_lock); |
| 698 | } |
| 699 | |
| 700 | /* |
| 701 | * Given an inode, search for an open context with the desired characteristics |
| 702 | */ |
| 703 | struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode) |
| 704 | { |
| 705 | struct nfs_inode *nfsi = NFS_I(inode); |
| 706 | struct nfs_open_context *pos, *ctx = NULL; |
| 707 | |
| 708 | spin_lock(&inode->i_lock); |
| 709 | list_for_each_entry(pos, &nfsi->open_files, list) { |
| 710 | if (cred != NULL && pos->cred != cred) |
| 711 | continue; |
| 712 | if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode) |
| 713 | continue; |
| 714 | ctx = get_nfs_open_context(pos); |
| 715 | break; |
| 716 | } |
| 717 | spin_unlock(&inode->i_lock); |
| 718 | return ctx; |
| 719 | } |
| 720 | |
| 721 | static void nfs_file_clear_open_context(struct file *filp) |
| 722 | { |
| 723 | struct inode *inode = filp->f_path.dentry->d_inode; |
| 724 | struct nfs_open_context *ctx = nfs_file_open_context(filp); |
| 725 | |
| 726 | if (ctx) { |
| 727 | filp->private_data = NULL; |
| 728 | spin_lock(&inode->i_lock); |
| 729 | list_move_tail(&ctx->list, &NFS_I(inode)->open_files); |
| 730 | spin_unlock(&inode->i_lock); |
| 731 | __put_nfs_open_context(ctx, filp->f_flags & O_DIRECT ? 0 : 1); |
| 732 | } |
| 733 | } |
| 734 | |
| 735 | /* |
| 736 | * These allocate and release file read/write context information. |
| 737 | */ |
| 738 | int nfs_open(struct inode *inode, struct file *filp) |
| 739 | { |
| 740 | struct nfs_open_context *ctx; |
| 741 | struct rpc_cred *cred; |
| 742 | |
| 743 | cred = rpc_lookup_cred(); |
| 744 | if (IS_ERR(cred)) |
| 745 | return PTR_ERR(cred); |
| 746 | ctx = alloc_nfs_open_context(filp->f_path.dentry, cred, filp->f_mode); |
| 747 | put_rpccred(cred); |
| 748 | if (ctx == NULL) |
| 749 | return -ENOMEM; |
| 750 | nfs_file_set_open_context(filp, ctx); |
| 751 | put_nfs_open_context(ctx); |
| 752 | nfs_fscache_set_inode_cookie(inode, filp); |
| 753 | return 0; |
| 754 | } |
| 755 | |
| 756 | int nfs_release(struct inode *inode, struct file *filp) |
| 757 | { |
| 758 | nfs_file_clear_open_context(filp); |
| 759 | return 0; |
| 760 | } |
| 761 | |
| 762 | /* |
| 763 | * This function is called whenever some part of NFS notices that |
| 764 | * the cached attributes have to be refreshed. |
| 765 | */ |
| 766 | int |
| 767 | __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) |
| 768 | { |
| 769 | int status = -ESTALE; |
| 770 | struct nfs_fattr *fattr = NULL; |
| 771 | struct nfs_inode *nfsi = NFS_I(inode); |
| 772 | |
| 773 | dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n", |
| 774 | inode->i_sb->s_id, (long long)NFS_FILEID(inode)); |
| 775 | |
| 776 | if (is_bad_inode(inode)) |
| 777 | goto out; |
| 778 | if (NFS_STALE(inode)) |
| 779 | goto out; |
| 780 | |
| 781 | status = -ENOMEM; |
| 782 | fattr = nfs_alloc_fattr(); |
| 783 | if (fattr == NULL) |
| 784 | goto out; |
| 785 | |
| 786 | nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE); |
| 787 | status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr); |
| 788 | if (status != 0) { |
| 789 | dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n", |
| 790 | inode->i_sb->s_id, |
| 791 | (long long)NFS_FILEID(inode), status); |
| 792 | if (status == -ESTALE) { |
| 793 | nfs_zap_caches(inode); |
| 794 | if (!S_ISDIR(inode->i_mode)) |
| 795 | set_bit(NFS_INO_STALE, &NFS_I(inode)->flags); |
| 796 | } |
| 797 | goto out; |
| 798 | } |
| 799 | |
| 800 | status = nfs_refresh_inode(inode, fattr); |
| 801 | if (status) { |
| 802 | dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n", |
| 803 | inode->i_sb->s_id, |
| 804 | (long long)NFS_FILEID(inode), status); |
| 805 | goto out; |
| 806 | } |
| 807 | |
| 808 | if (nfsi->cache_validity & NFS_INO_INVALID_ACL) |
| 809 | nfs_zap_acl_cache(inode); |
| 810 | |
| 811 | dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n", |
| 812 | inode->i_sb->s_id, |
| 813 | (long long)NFS_FILEID(inode)); |
| 814 | |
| 815 | out: |
| 816 | nfs_free_fattr(fattr); |
| 817 | return status; |
| 818 | } |
| 819 | |
| 820 | int nfs_attribute_timeout(struct inode *inode) |
| 821 | { |
| 822 | struct nfs_inode *nfsi = NFS_I(inode); |
| 823 | |
| 824 | return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo); |
| 825 | } |
| 826 | |
| 827 | static int nfs_attribute_cache_expired(struct inode *inode) |
| 828 | { |
| 829 | if (nfs_have_delegated_attributes(inode)) |
| 830 | return 0; |
| 831 | return nfs_attribute_timeout(inode); |
| 832 | } |
| 833 | |
| 834 | /** |
| 835 | * nfs_revalidate_inode - Revalidate the inode attributes |
| 836 | * @server - pointer to nfs_server struct |
| 837 | * @inode - pointer to inode struct |
| 838 | * |
| 839 | * Updates inode attribute information by retrieving the data from the server. |
| 840 | */ |
| 841 | int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode) |
| 842 | { |
| 843 | if (!(NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATTR) |
| 844 | && !nfs_attribute_cache_expired(inode)) |
| 845 | return NFS_STALE(inode) ? -ESTALE : 0; |
| 846 | return __nfs_revalidate_inode(server, inode); |
| 847 | } |
| 848 | |
| 849 | static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping) |
| 850 | { |
| 851 | struct nfs_inode *nfsi = NFS_I(inode); |
| 852 | |
| 853 | if (mapping->nrpages != 0) { |
| 854 | int ret = invalidate_inode_pages2(mapping); |
| 855 | if (ret < 0) |
| 856 | return ret; |
| 857 | } |
| 858 | spin_lock(&inode->i_lock); |
| 859 | nfsi->cache_validity &= ~NFS_INO_INVALID_DATA; |
| 860 | if (S_ISDIR(inode->i_mode)) |
| 861 | memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf)); |
| 862 | spin_unlock(&inode->i_lock); |
| 863 | nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE); |
| 864 | nfs_fscache_reset_inode_cookie(inode); |
| 865 | dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n", |
| 866 | inode->i_sb->s_id, (long long)NFS_FILEID(inode)); |
| 867 | return 0; |
| 868 | } |
| 869 | |
| 870 | /** |
| 871 | * nfs_revalidate_mapping - Revalidate the pagecache |
| 872 | * @inode - pointer to host inode |
| 873 | * @mapping - pointer to mapping |
| 874 | */ |
| 875 | int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping) |
| 876 | { |
| 877 | struct nfs_inode *nfsi = NFS_I(inode); |
| 878 | int ret = 0; |
| 879 | |
| 880 | if ((nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE) |
| 881 | || nfs_attribute_cache_expired(inode) |
| 882 | || NFS_STALE(inode)) { |
| 883 | ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode); |
| 884 | if (ret < 0) |
| 885 | goto out; |
| 886 | } |
| 887 | if (nfsi->cache_validity & NFS_INO_INVALID_DATA) |
| 888 | ret = nfs_invalidate_mapping(inode, mapping); |
| 889 | out: |
| 890 | return ret; |
| 891 | } |
| 892 | |
| 893 | static unsigned long nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr) |
| 894 | { |
| 895 | struct nfs_inode *nfsi = NFS_I(inode); |
| 896 | unsigned long ret = 0; |
| 897 | |
| 898 | if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE) |
| 899 | && (fattr->valid & NFS_ATTR_FATTR_CHANGE) |
| 900 | && inode->i_version == fattr->pre_change_attr) { |
| 901 | inode->i_version = fattr->change_attr; |
| 902 | if (S_ISDIR(inode->i_mode)) |
| 903 | nfsi->cache_validity |= NFS_INO_INVALID_DATA; |
| 904 | ret |= NFS_INO_INVALID_ATTR; |
| 905 | } |
| 906 | /* If we have atomic WCC data, we may update some attributes */ |
| 907 | if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME) |
| 908 | && (fattr->valid & NFS_ATTR_FATTR_CTIME) |
| 909 | && timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) { |
| 910 | memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime)); |
| 911 | ret |= NFS_INO_INVALID_ATTR; |
| 912 | } |
| 913 | |
| 914 | if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME) |
| 915 | && (fattr->valid & NFS_ATTR_FATTR_MTIME) |
| 916 | && timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) { |
| 917 | memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime)); |
| 918 | if (S_ISDIR(inode->i_mode)) |
| 919 | nfsi->cache_validity |= NFS_INO_INVALID_DATA; |
| 920 | ret |= NFS_INO_INVALID_ATTR; |
| 921 | } |
| 922 | if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE) |
| 923 | && (fattr->valid & NFS_ATTR_FATTR_SIZE) |
| 924 | && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size) |
| 925 | && nfsi->npages == 0) { |
| 926 | i_size_write(inode, nfs_size_to_loff_t(fattr->size)); |
| 927 | ret |= NFS_INO_INVALID_ATTR; |
| 928 | } |
| 929 | return ret; |
| 930 | } |
| 931 | |
| 932 | /** |
| 933 | * nfs_check_inode_attributes - verify consistency of the inode attribute cache |
| 934 | * @inode - pointer to inode |
| 935 | * @fattr - updated attributes |
| 936 | * |
| 937 | * Verifies the attribute cache. If we have just changed the attributes, |
| 938 | * so that fattr carries weak cache consistency data, then it may |
| 939 | * also update the ctime/mtime/change_attribute. |
| 940 | */ |
| 941 | static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr) |
| 942 | { |
| 943 | struct nfs_inode *nfsi = NFS_I(inode); |
| 944 | loff_t cur_size, new_isize; |
| 945 | unsigned long invalid = 0; |
| 946 | |
| 947 | |
| 948 | /* Has the inode gone and changed behind our back? */ |
| 949 | if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid) |
| 950 | return -EIO; |
| 951 | if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) |
| 952 | return -EIO; |
| 953 | |
| 954 | if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && |
| 955 | inode->i_version != fattr->change_attr) |
| 956 | invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; |
| 957 | |
| 958 | /* Verify a few of the more important attributes */ |
| 959 | if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&inode->i_mtime, &fattr->mtime)) |
| 960 | invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; |
| 961 | |
| 962 | if (fattr->valid & NFS_ATTR_FATTR_SIZE) { |
| 963 | cur_size = i_size_read(inode); |
| 964 | new_isize = nfs_size_to_loff_t(fattr->size); |
| 965 | if (cur_size != new_isize && nfsi->npages == 0) |
| 966 | invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; |
| 967 | } |
| 968 | |
| 969 | /* Have any file permissions changed? */ |
| 970 | if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) |
| 971 | invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL; |
| 972 | if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && inode->i_uid != fattr->uid) |
| 973 | invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL; |
| 974 | if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && inode->i_gid != fattr->gid) |
| 975 | invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL; |
| 976 | |
| 977 | /* Has the link count changed? */ |
| 978 | if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink) |
| 979 | invalid |= NFS_INO_INVALID_ATTR; |
| 980 | |
| 981 | if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&inode->i_atime, &fattr->atime)) |
| 982 | invalid |= NFS_INO_INVALID_ATIME; |
| 983 | |
| 984 | if (invalid != 0) |
| 985 | nfsi->cache_validity |= invalid; |
| 986 | |
| 987 | nfsi->read_cache_jiffies = fattr->time_start; |
| 988 | return 0; |
| 989 | } |
| 990 | |
| 991 | static int nfs_ctime_need_update(const struct inode *inode, const struct nfs_fattr *fattr) |
| 992 | { |
| 993 | if (!(fattr->valid & NFS_ATTR_FATTR_CTIME)) |
| 994 | return 0; |
| 995 | return timespec_compare(&fattr->ctime, &inode->i_ctime) > 0; |
| 996 | } |
| 997 | |
| 998 | static int nfs_size_need_update(const struct inode *inode, const struct nfs_fattr *fattr) |
| 999 | { |
| 1000 | if (!(fattr->valid & NFS_ATTR_FATTR_SIZE)) |
| 1001 | return 0; |
| 1002 | return nfs_size_to_loff_t(fattr->size) > i_size_read(inode); |
| 1003 | } |
| 1004 | |
| 1005 | static atomic_long_t nfs_attr_generation_counter; |
| 1006 | |
| 1007 | static unsigned long nfs_read_attr_generation_counter(void) |
| 1008 | { |
| 1009 | return atomic_long_read(&nfs_attr_generation_counter); |
| 1010 | } |
| 1011 | |
| 1012 | unsigned long nfs_inc_attr_generation_counter(void) |
| 1013 | { |
| 1014 | return atomic_long_inc_return(&nfs_attr_generation_counter); |
| 1015 | } |
| 1016 | |
| 1017 | void nfs_fattr_init(struct nfs_fattr *fattr) |
| 1018 | { |
| 1019 | fattr->valid = 0; |
| 1020 | fattr->time_start = jiffies; |
| 1021 | fattr->gencount = nfs_inc_attr_generation_counter(); |
| 1022 | } |
| 1023 | |
| 1024 | struct nfs_fattr *nfs_alloc_fattr(void) |
| 1025 | { |
| 1026 | struct nfs_fattr *fattr; |
| 1027 | |
| 1028 | fattr = kmalloc(sizeof(*fattr), GFP_NOFS); |
| 1029 | if (fattr != NULL) |
| 1030 | nfs_fattr_init(fattr); |
| 1031 | return fattr; |
| 1032 | } |
| 1033 | |
| 1034 | struct nfs_fh *nfs_alloc_fhandle(void) |
| 1035 | { |
| 1036 | struct nfs_fh *fh; |
| 1037 | |
| 1038 | fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS); |
| 1039 | if (fh != NULL) |
| 1040 | fh->size = 0; |
| 1041 | return fh; |
| 1042 | } |
| 1043 | |
| 1044 | /** |
| 1045 | * nfs_inode_attrs_need_update - check if the inode attributes need updating |
| 1046 | * @inode - pointer to inode |
| 1047 | * @fattr - attributes |
| 1048 | * |
| 1049 | * Attempt to divine whether or not an RPC call reply carrying stale |
| 1050 | * attributes got scheduled after another call carrying updated ones. |
| 1051 | * |
| 1052 | * To do so, the function first assumes that a more recent ctime means |
| 1053 | * that the attributes in fattr are newer, however it also attempt to |
| 1054 | * catch the case where ctime either didn't change, or went backwards |
| 1055 | * (if someone reset the clock on the server) by looking at whether |
| 1056 | * or not this RPC call was started after the inode was last updated. |
| 1057 | * Note also the check for wraparound of 'attr_gencount' |
| 1058 | * |
| 1059 | * The function returns 'true' if it thinks the attributes in 'fattr' are |
| 1060 | * more recent than the ones cached in the inode. |
| 1061 | * |
| 1062 | */ |
| 1063 | static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr) |
| 1064 | { |
| 1065 | const struct nfs_inode *nfsi = NFS_I(inode); |
| 1066 | |
| 1067 | return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 || |
| 1068 | nfs_ctime_need_update(inode, fattr) || |
| 1069 | nfs_size_need_update(inode, fattr) || |
| 1070 | ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0); |
| 1071 | } |
| 1072 | |
| 1073 | static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr) |
| 1074 | { |
| 1075 | if (nfs_inode_attrs_need_update(inode, fattr)) |
| 1076 | return nfs_update_inode(inode, fattr); |
| 1077 | return nfs_check_inode_attributes(inode, fattr); |
| 1078 | } |
| 1079 | |
| 1080 | /** |
| 1081 | * nfs_refresh_inode - try to update the inode attribute cache |
| 1082 | * @inode - pointer to inode |
| 1083 | * @fattr - updated attributes |
| 1084 | * |
| 1085 | * Check that an RPC call that returned attributes has not overlapped with |
| 1086 | * other recent updates of the inode metadata, then decide whether it is |
| 1087 | * safe to do a full update of the inode attributes, or whether just to |
| 1088 | * call nfs_check_inode_attributes. |
| 1089 | */ |
| 1090 | int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr) |
| 1091 | { |
| 1092 | int status; |
| 1093 | |
| 1094 | if ((fattr->valid & NFS_ATTR_FATTR) == 0) |
| 1095 | return 0; |
| 1096 | spin_lock(&inode->i_lock); |
| 1097 | status = nfs_refresh_inode_locked(inode, fattr); |
| 1098 | spin_unlock(&inode->i_lock); |
| 1099 | |
| 1100 | return status; |
| 1101 | } |
| 1102 | |
| 1103 | static int nfs_post_op_update_inode_locked(struct inode *inode, struct nfs_fattr *fattr) |
| 1104 | { |
| 1105 | struct nfs_inode *nfsi = NFS_I(inode); |
| 1106 | |
| 1107 | nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE; |
| 1108 | if (S_ISDIR(inode->i_mode)) |
| 1109 | nfsi->cache_validity |= NFS_INO_INVALID_DATA; |
| 1110 | if ((fattr->valid & NFS_ATTR_FATTR) == 0) |
| 1111 | return 0; |
| 1112 | return nfs_refresh_inode_locked(inode, fattr); |
| 1113 | } |
| 1114 | |
| 1115 | /** |
| 1116 | * nfs_post_op_update_inode - try to update the inode attribute cache |
| 1117 | * @inode - pointer to inode |
| 1118 | * @fattr - updated attributes |
| 1119 | * |
| 1120 | * After an operation that has changed the inode metadata, mark the |
| 1121 | * attribute cache as being invalid, then try to update it. |
| 1122 | * |
| 1123 | * NB: if the server didn't return any post op attributes, this |
| 1124 | * function will force the retrieval of attributes before the next |
| 1125 | * NFS request. Thus it should be used only for operations that |
| 1126 | * are expected to change one or more attributes, to avoid |
| 1127 | * unnecessary NFS requests and trips through nfs_update_inode(). |
| 1128 | */ |
| 1129 | int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr) |
| 1130 | { |
| 1131 | int status; |
| 1132 | |
| 1133 | spin_lock(&inode->i_lock); |
| 1134 | status = nfs_post_op_update_inode_locked(inode, fattr); |
| 1135 | spin_unlock(&inode->i_lock); |
| 1136 | return status; |
| 1137 | } |
| 1138 | |
| 1139 | /** |
| 1140 | * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache |
| 1141 | * @inode - pointer to inode |
| 1142 | * @fattr - updated attributes |
| 1143 | * |
| 1144 | * After an operation that has changed the inode metadata, mark the |
| 1145 | * attribute cache as being invalid, then try to update it. Fake up |
| 1146 | * weak cache consistency data, if none exist. |
| 1147 | * |
| 1148 | * This function is mainly designed to be used by the ->write_done() functions. |
| 1149 | */ |
| 1150 | int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr) |
| 1151 | { |
| 1152 | int status; |
| 1153 | |
| 1154 | spin_lock(&inode->i_lock); |
| 1155 | /* Don't do a WCC update if these attributes are already stale */ |
| 1156 | if ((fattr->valid & NFS_ATTR_FATTR) == 0 || |
| 1157 | !nfs_inode_attrs_need_update(inode, fattr)) { |
| 1158 | fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE |
| 1159 | | NFS_ATTR_FATTR_PRESIZE |
| 1160 | | NFS_ATTR_FATTR_PREMTIME |
| 1161 | | NFS_ATTR_FATTR_PRECTIME); |
| 1162 | goto out_noforce; |
| 1163 | } |
| 1164 | if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && |
| 1165 | (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) { |
| 1166 | fattr->pre_change_attr = inode->i_version; |
| 1167 | fattr->valid |= NFS_ATTR_FATTR_PRECHANGE; |
| 1168 | } |
| 1169 | if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 && |
| 1170 | (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) { |
| 1171 | memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime)); |
| 1172 | fattr->valid |= NFS_ATTR_FATTR_PRECTIME; |
| 1173 | } |
| 1174 | if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 && |
| 1175 | (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) { |
| 1176 | memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime)); |
| 1177 | fattr->valid |= NFS_ATTR_FATTR_PREMTIME; |
| 1178 | } |
| 1179 | if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 && |
| 1180 | (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) { |
| 1181 | fattr->pre_size = i_size_read(inode); |
| 1182 | fattr->valid |= NFS_ATTR_FATTR_PRESIZE; |
| 1183 | } |
| 1184 | out_noforce: |
| 1185 | status = nfs_post_op_update_inode_locked(inode, fattr); |
| 1186 | spin_unlock(&inode->i_lock); |
| 1187 | return status; |
| 1188 | } |
| 1189 | |
| 1190 | /* |
| 1191 | * Many nfs protocol calls return the new file attributes after |
| 1192 | * an operation. Here we update the inode to reflect the state |
| 1193 | * of the server's inode. |
| 1194 | * |
| 1195 | * This is a bit tricky because we have to make sure all dirty pages |
| 1196 | * have been sent off to the server before calling invalidate_inode_pages. |
| 1197 | * To make sure no other process adds more write requests while we try |
| 1198 | * our best to flush them, we make them sleep during the attribute refresh. |
| 1199 | * |
| 1200 | * A very similar scenario holds for the dir cache. |
| 1201 | */ |
| 1202 | static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr) |
| 1203 | { |
| 1204 | struct nfs_server *server; |
| 1205 | struct nfs_inode *nfsi = NFS_I(inode); |
| 1206 | loff_t cur_isize, new_isize; |
| 1207 | unsigned long invalid = 0; |
| 1208 | unsigned long now = jiffies; |
| 1209 | unsigned long save_cache_validity; |
| 1210 | |
| 1211 | dfprintk(VFS, "NFS: %s(%s/%ld ct=%d info=0x%x)\n", |
| 1212 | __func__, inode->i_sb->s_id, inode->i_ino, |
| 1213 | atomic_read(&inode->i_count), fattr->valid); |
| 1214 | |
| 1215 | if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid) |
| 1216 | goto out_fileid; |
| 1217 | |
| 1218 | /* |
| 1219 | * Make sure the inode's type hasn't changed. |
| 1220 | */ |
| 1221 | if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) |
| 1222 | goto out_changed; |
| 1223 | |
| 1224 | server = NFS_SERVER(inode); |
| 1225 | /* Update the fsid? */ |
| 1226 | if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) && |
| 1227 | !nfs_fsid_equal(&server->fsid, &fattr->fsid) && |
| 1228 | !IS_AUTOMOUNT(inode)) |
| 1229 | server->fsid = fattr->fsid; |
| 1230 | |
| 1231 | /* |
| 1232 | * Update the read time so we don't revalidate too often. |
| 1233 | */ |
| 1234 | nfsi->read_cache_jiffies = fattr->time_start; |
| 1235 | |
| 1236 | save_cache_validity = nfsi->cache_validity; |
| 1237 | nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR |
| 1238 | | NFS_INO_INVALID_ATIME |
| 1239 | | NFS_INO_REVAL_FORCED |
| 1240 | | NFS_INO_REVAL_PAGECACHE); |
| 1241 | |
| 1242 | /* Do atomic weak cache consistency updates */ |
| 1243 | invalid |= nfs_wcc_update_inode(inode, fattr); |
| 1244 | |
| 1245 | /* More cache consistency checks */ |
| 1246 | if (fattr->valid & NFS_ATTR_FATTR_CHANGE) { |
| 1247 | if (inode->i_version != fattr->change_attr) { |
| 1248 | dprintk("NFS: change_attr change on server for file %s/%ld\n", |
| 1249 | inode->i_sb->s_id, inode->i_ino); |
| 1250 | invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; |
| 1251 | if (S_ISDIR(inode->i_mode)) |
| 1252 | nfs_force_lookup_revalidate(inode); |
| 1253 | inode->i_version = fattr->change_attr; |
| 1254 | } |
| 1255 | } else if (server->caps & NFS_CAP_CHANGE_ATTR) |
| 1256 | invalid |= save_cache_validity; |
| 1257 | |
| 1258 | if (fattr->valid & NFS_ATTR_FATTR_MTIME) { |
| 1259 | /* NFSv2/v3: Check if the mtime agrees */ |
| 1260 | if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) { |
| 1261 | dprintk("NFS: mtime change on server for file %s/%ld\n", |
| 1262 | inode->i_sb->s_id, inode->i_ino); |
| 1263 | invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA; |
| 1264 | if (S_ISDIR(inode->i_mode)) |
| 1265 | nfs_force_lookup_revalidate(inode); |
| 1266 | memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime)); |
| 1267 | } |
| 1268 | } else if (server->caps & NFS_CAP_MTIME) |
| 1269 | invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR |
| 1270 | | NFS_INO_INVALID_DATA |
| 1271 | | NFS_INO_REVAL_PAGECACHE |
| 1272 | | NFS_INO_REVAL_FORCED); |
| 1273 | |
| 1274 | if (fattr->valid & NFS_ATTR_FATTR_CTIME) { |
| 1275 | /* If ctime has changed we should definitely clear access+acl caches */ |
| 1276 | if (!timespec_equal(&inode->i_ctime, &fattr->ctime)) { |
| 1277 | invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; |
| 1278 | /* and probably clear data for a directory too as utimes can cause |
| 1279 | * havoc with our cache. |
| 1280 | */ |
| 1281 | if (S_ISDIR(inode->i_mode)) { |
| 1282 | invalid |= NFS_INO_INVALID_DATA; |
| 1283 | nfs_force_lookup_revalidate(inode); |
| 1284 | } |
| 1285 | memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime)); |
| 1286 | } |
| 1287 | } else if (server->caps & NFS_CAP_CTIME) |
| 1288 | invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR |
| 1289 | | NFS_INO_INVALID_ACCESS |
| 1290 | | NFS_INO_INVALID_ACL |
| 1291 | | NFS_INO_REVAL_FORCED); |
| 1292 | |
| 1293 | /* Check if our cached file size is stale */ |
| 1294 | if (fattr->valid & NFS_ATTR_FATTR_SIZE) { |
| 1295 | new_isize = nfs_size_to_loff_t(fattr->size); |
| 1296 | cur_isize = i_size_read(inode); |
| 1297 | if (new_isize != cur_isize) { |
| 1298 | /* Do we perhaps have any outstanding writes, or has |
| 1299 | * the file grown beyond our last write? */ |
| 1300 | if ((nfsi->npages == 0 && !test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) || |
| 1301 | new_isize > cur_isize) { |
| 1302 | i_size_write(inode, new_isize); |
| 1303 | invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA; |
| 1304 | } |
| 1305 | dprintk("NFS: isize change on server for file %s/%ld " |
| 1306 | "(%Ld to %Ld)\n", |
| 1307 | inode->i_sb->s_id, |
| 1308 | inode->i_ino, |
| 1309 | (long long)cur_isize, |
| 1310 | (long long)new_isize); |
| 1311 | } |
| 1312 | } else |
| 1313 | invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR |
| 1314 | | NFS_INO_REVAL_PAGECACHE |
| 1315 | | NFS_INO_REVAL_FORCED); |
| 1316 | |
| 1317 | |
| 1318 | if (fattr->valid & NFS_ATTR_FATTR_ATIME) |
| 1319 | memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime)); |
| 1320 | else if (server->caps & NFS_CAP_ATIME) |
| 1321 | invalid |= save_cache_validity & (NFS_INO_INVALID_ATIME |
| 1322 | | NFS_INO_REVAL_FORCED); |
| 1323 | |
| 1324 | if (fattr->valid & NFS_ATTR_FATTR_MODE) { |
| 1325 | if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) { |
| 1326 | umode_t newmode = inode->i_mode & S_IFMT; |
| 1327 | newmode |= fattr->mode & S_IALLUGO; |
| 1328 | inode->i_mode = newmode; |
| 1329 | invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; |
| 1330 | } |
| 1331 | } else if (server->caps & NFS_CAP_MODE) |
| 1332 | invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR |
| 1333 | | NFS_INO_INVALID_ACCESS |
| 1334 | | NFS_INO_INVALID_ACL |
| 1335 | | NFS_INO_REVAL_FORCED); |
| 1336 | |
| 1337 | if (fattr->valid & NFS_ATTR_FATTR_OWNER) { |
| 1338 | if (inode->i_uid != fattr->uid) { |
| 1339 | invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; |
| 1340 | inode->i_uid = fattr->uid; |
| 1341 | } |
| 1342 | } else if (server->caps & NFS_CAP_OWNER) |
| 1343 | invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR |
| 1344 | | NFS_INO_INVALID_ACCESS |
| 1345 | | NFS_INO_INVALID_ACL |
| 1346 | | NFS_INO_REVAL_FORCED); |
| 1347 | |
| 1348 | if (fattr->valid & NFS_ATTR_FATTR_GROUP) { |
| 1349 | if (inode->i_gid != fattr->gid) { |
| 1350 | invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL; |
| 1351 | inode->i_gid = fattr->gid; |
| 1352 | } |
| 1353 | } else if (server->caps & NFS_CAP_OWNER_GROUP) |
| 1354 | invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR |
| 1355 | | NFS_INO_INVALID_ACCESS |
| 1356 | | NFS_INO_INVALID_ACL |
| 1357 | | NFS_INO_REVAL_FORCED); |
| 1358 | |
| 1359 | if (fattr->valid & NFS_ATTR_FATTR_NLINK) { |
| 1360 | if (inode->i_nlink != fattr->nlink) { |
| 1361 | invalid |= NFS_INO_INVALID_ATTR; |
| 1362 | if (S_ISDIR(inode->i_mode)) |
| 1363 | invalid |= NFS_INO_INVALID_DATA; |
| 1364 | set_nlink(inode, fattr->nlink); |
| 1365 | } |
| 1366 | } else if (server->caps & NFS_CAP_NLINK) |
| 1367 | invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR |
| 1368 | | NFS_INO_REVAL_FORCED); |
| 1369 | |
| 1370 | if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) { |
| 1371 | /* |
| 1372 | * report the blocks in 512byte units |
| 1373 | */ |
| 1374 | inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used); |
| 1375 | } |
| 1376 | if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED) |
| 1377 | inode->i_blocks = fattr->du.nfs2.blocks; |
| 1378 | |
| 1379 | /* Update attrtimeo value if we're out of the unstable period */ |
| 1380 | if (invalid & NFS_INO_INVALID_ATTR) { |
| 1381 | nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE); |
| 1382 | nfsi->attrtimeo = NFS_MINATTRTIMEO(inode); |
| 1383 | nfsi->attrtimeo_timestamp = now; |
| 1384 | nfsi->attr_gencount = nfs_inc_attr_generation_counter(); |
| 1385 | } else { |
| 1386 | if (!time_in_range_open(now, nfsi->attrtimeo_timestamp, nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) { |
| 1387 | if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode)) |
| 1388 | nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode); |
| 1389 | nfsi->attrtimeo_timestamp = now; |
| 1390 | } |
| 1391 | } |
| 1392 | invalid &= ~NFS_INO_INVALID_ATTR; |
| 1393 | /* Don't invalidate the data if we were to blame */ |
| 1394 | if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) |
| 1395 | || S_ISLNK(inode->i_mode))) |
| 1396 | invalid &= ~NFS_INO_INVALID_DATA; |
| 1397 | if (!nfs_have_delegation(inode, FMODE_READ) || |
| 1398 | (save_cache_validity & NFS_INO_REVAL_FORCED)) |
| 1399 | nfsi->cache_validity |= invalid; |
| 1400 | |
| 1401 | return 0; |
| 1402 | out_changed: |
| 1403 | /* |
| 1404 | * Big trouble! The inode has become a different object. |
| 1405 | */ |
| 1406 | printk(KERN_DEBUG "%s: inode %ld mode changed, %07o to %07o\n", |
| 1407 | __func__, inode->i_ino, inode->i_mode, fattr->mode); |
| 1408 | out_err: |
| 1409 | /* |
| 1410 | * No need to worry about unhashing the dentry, as the |
| 1411 | * lookup validation will know that the inode is bad. |
| 1412 | * (But we fall through to invalidate the caches.) |
| 1413 | */ |
| 1414 | nfs_invalidate_inode(inode); |
| 1415 | return -ESTALE; |
| 1416 | |
| 1417 | out_fileid: |
| 1418 | printk(KERN_ERR "NFS: server %s error: fileid changed\n" |
| 1419 | "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n", |
| 1420 | NFS_SERVER(inode)->nfs_client->cl_hostname, inode->i_sb->s_id, |
| 1421 | (long long)nfsi->fileid, (long long)fattr->fileid); |
| 1422 | goto out_err; |
| 1423 | } |
| 1424 | |
| 1425 | |
| 1426 | #ifdef CONFIG_NFS_V4 |
| 1427 | |
| 1428 | /* |
| 1429 | * Clean out any remaining NFSv4 state that might be left over due |
| 1430 | * to open() calls that passed nfs_atomic_lookup, but failed to call |
| 1431 | * nfs_open(). |
| 1432 | */ |
| 1433 | void nfs4_evict_inode(struct inode *inode) |
| 1434 | { |
| 1435 | truncate_inode_pages(&inode->i_data, 0); |
| 1436 | end_writeback(inode); |
| 1437 | pnfs_return_layout(inode); |
| 1438 | pnfs_destroy_layout(NFS_I(inode)); |
| 1439 | /* If we are holding a delegation, return it! */ |
| 1440 | nfs_inode_return_delegation_noreclaim(inode); |
| 1441 | /* First call standard NFS clear_inode() code */ |
| 1442 | nfs_clear_inode(inode); |
| 1443 | } |
| 1444 | #endif |
| 1445 | |
| 1446 | struct inode *nfs_alloc_inode(struct super_block *sb) |
| 1447 | { |
| 1448 | struct nfs_inode *nfsi; |
| 1449 | nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL); |
| 1450 | if (!nfsi) |
| 1451 | return NULL; |
| 1452 | nfsi->flags = 0UL; |
| 1453 | nfsi->cache_validity = 0UL; |
| 1454 | #ifdef CONFIG_NFS_V3_ACL |
| 1455 | nfsi->acl_access = ERR_PTR(-EAGAIN); |
| 1456 | nfsi->acl_default = ERR_PTR(-EAGAIN); |
| 1457 | #endif |
| 1458 | #ifdef CONFIG_NFS_V4 |
| 1459 | nfsi->nfs4_acl = NULL; |
| 1460 | #endif /* CONFIG_NFS_V4 */ |
| 1461 | return &nfsi->vfs_inode; |
| 1462 | } |
| 1463 | |
| 1464 | static void nfs_i_callback(struct rcu_head *head) |
| 1465 | { |
| 1466 | struct inode *inode = container_of(head, struct inode, i_rcu); |
| 1467 | INIT_LIST_HEAD(&inode->i_dentry); |
| 1468 | kmem_cache_free(nfs_inode_cachep, NFS_I(inode)); |
| 1469 | } |
| 1470 | |
| 1471 | void nfs_destroy_inode(struct inode *inode) |
| 1472 | { |
| 1473 | call_rcu(&inode->i_rcu, nfs_i_callback); |
| 1474 | } |
| 1475 | |
| 1476 | static inline void nfs4_init_once(struct nfs_inode *nfsi) |
| 1477 | { |
| 1478 | #ifdef CONFIG_NFS_V4 |
| 1479 | INIT_LIST_HEAD(&nfsi->open_states); |
| 1480 | nfsi->delegation = NULL; |
| 1481 | nfsi->delegation_state = 0; |
| 1482 | init_rwsem(&nfsi->rwsem); |
| 1483 | nfsi->layout = NULL; |
| 1484 | atomic_set(&nfsi->commits_outstanding, 0); |
| 1485 | #endif |
| 1486 | } |
| 1487 | |
| 1488 | static void init_once(void *foo) |
| 1489 | { |
| 1490 | struct nfs_inode *nfsi = (struct nfs_inode *) foo; |
| 1491 | |
| 1492 | inode_init_once(&nfsi->vfs_inode); |
| 1493 | INIT_LIST_HEAD(&nfsi->open_files); |
| 1494 | INIT_LIST_HEAD(&nfsi->access_cache_entry_lru); |
| 1495 | INIT_LIST_HEAD(&nfsi->access_cache_inode_lru); |
| 1496 | INIT_RADIX_TREE(&nfsi->nfs_page_tree, GFP_ATOMIC); |
| 1497 | nfsi->npages = 0; |
| 1498 | nfsi->ncommit = 0; |
| 1499 | atomic_set(&nfsi->silly_count, 1); |
| 1500 | INIT_HLIST_HEAD(&nfsi->silly_list); |
| 1501 | init_waitqueue_head(&nfsi->waitqueue); |
| 1502 | nfs4_init_once(nfsi); |
| 1503 | } |
| 1504 | |
| 1505 | static int __init nfs_init_inodecache(void) |
| 1506 | { |
| 1507 | nfs_inode_cachep = kmem_cache_create("nfs_inode_cache", |
| 1508 | sizeof(struct nfs_inode), |
| 1509 | 0, (SLAB_RECLAIM_ACCOUNT| |
| 1510 | SLAB_MEM_SPREAD), |
| 1511 | init_once); |
| 1512 | if (nfs_inode_cachep == NULL) |
| 1513 | return -ENOMEM; |
| 1514 | |
| 1515 | return 0; |
| 1516 | } |
| 1517 | |
| 1518 | static void nfs_destroy_inodecache(void) |
| 1519 | { |
| 1520 | kmem_cache_destroy(nfs_inode_cachep); |
| 1521 | } |
| 1522 | |
| 1523 | struct workqueue_struct *nfsiod_workqueue; |
| 1524 | |
| 1525 | /* |
| 1526 | * start up the nfsiod workqueue |
| 1527 | */ |
| 1528 | static int nfsiod_start(void) |
| 1529 | { |
| 1530 | struct workqueue_struct *wq; |
| 1531 | dprintk("RPC: creating workqueue nfsiod\n"); |
| 1532 | wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0); |
| 1533 | if (wq == NULL) |
| 1534 | return -ENOMEM; |
| 1535 | nfsiod_workqueue = wq; |
| 1536 | return 0; |
| 1537 | } |
| 1538 | |
| 1539 | /* |
| 1540 | * Destroy the nfsiod workqueue |
| 1541 | */ |
| 1542 | static void nfsiod_stop(void) |
| 1543 | { |
| 1544 | struct workqueue_struct *wq; |
| 1545 | |
| 1546 | wq = nfsiod_workqueue; |
| 1547 | if (wq == NULL) |
| 1548 | return; |
| 1549 | nfsiod_workqueue = NULL; |
| 1550 | destroy_workqueue(wq); |
| 1551 | } |
| 1552 | |
| 1553 | /* |
| 1554 | * Initialize NFS |
| 1555 | */ |
| 1556 | static int __init init_nfs_fs(void) |
| 1557 | { |
| 1558 | int err; |
| 1559 | |
| 1560 | err = nfs_idmap_init(); |
| 1561 | if (err < 0) |
| 1562 | goto out9; |
| 1563 | |
| 1564 | err = nfs_dns_resolver_init(); |
| 1565 | if (err < 0) |
| 1566 | goto out8; |
| 1567 | |
| 1568 | err = nfs_fscache_register(); |
| 1569 | if (err < 0) |
| 1570 | goto out7; |
| 1571 | |
| 1572 | err = nfsiod_start(); |
| 1573 | if (err) |
| 1574 | goto out6; |
| 1575 | |
| 1576 | err = nfs_fs_proc_init(); |
| 1577 | if (err) |
| 1578 | goto out5; |
| 1579 | |
| 1580 | err = nfs_init_nfspagecache(); |
| 1581 | if (err) |
| 1582 | goto out4; |
| 1583 | |
| 1584 | err = nfs_init_inodecache(); |
| 1585 | if (err) |
| 1586 | goto out3; |
| 1587 | |
| 1588 | err = nfs_init_readpagecache(); |
| 1589 | if (err) |
| 1590 | goto out2; |
| 1591 | |
| 1592 | err = nfs_init_writepagecache(); |
| 1593 | if (err) |
| 1594 | goto out1; |
| 1595 | |
| 1596 | err = nfs_init_directcache(); |
| 1597 | if (err) |
| 1598 | goto out0; |
| 1599 | |
| 1600 | #ifdef CONFIG_PROC_FS |
| 1601 | rpc_proc_register(&nfs_rpcstat); |
| 1602 | #endif |
| 1603 | if ((err = register_nfs_fs()) != 0) |
| 1604 | goto out; |
| 1605 | return 0; |
| 1606 | out: |
| 1607 | #ifdef CONFIG_PROC_FS |
| 1608 | rpc_proc_unregister("nfs"); |
| 1609 | #endif |
| 1610 | nfs_destroy_directcache(); |
| 1611 | out0: |
| 1612 | nfs_destroy_writepagecache(); |
| 1613 | out1: |
| 1614 | nfs_destroy_readpagecache(); |
| 1615 | out2: |
| 1616 | nfs_destroy_inodecache(); |
| 1617 | out3: |
| 1618 | nfs_destroy_nfspagecache(); |
| 1619 | out4: |
| 1620 | nfs_fs_proc_exit(); |
| 1621 | out5: |
| 1622 | nfsiod_stop(); |
| 1623 | out6: |
| 1624 | nfs_fscache_unregister(); |
| 1625 | out7: |
| 1626 | nfs_dns_resolver_destroy(); |
| 1627 | out8: |
| 1628 | nfs_idmap_quit(); |
| 1629 | out9: |
| 1630 | return err; |
| 1631 | } |
| 1632 | |
| 1633 | static void __exit exit_nfs_fs(void) |
| 1634 | { |
| 1635 | nfs_destroy_directcache(); |
| 1636 | nfs_destroy_writepagecache(); |
| 1637 | nfs_destroy_readpagecache(); |
| 1638 | nfs_destroy_inodecache(); |
| 1639 | nfs_destroy_nfspagecache(); |
| 1640 | nfs_fscache_unregister(); |
| 1641 | nfs_dns_resolver_destroy(); |
| 1642 | nfs_idmap_quit(); |
| 1643 | #ifdef CONFIG_PROC_FS |
| 1644 | rpc_proc_unregister("nfs"); |
| 1645 | #endif |
| 1646 | nfs_cleanup_cb_ident_idr(); |
| 1647 | unregister_nfs_fs(); |
| 1648 | nfs_fs_proc_exit(); |
| 1649 | nfsiod_stop(); |
| 1650 | } |
| 1651 | |
| 1652 | /* Not quite true; I just maintain it */ |
| 1653 | MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); |
| 1654 | MODULE_LICENSE("GPL"); |
| 1655 | module_param(enable_ino64, bool, 0644); |
| 1656 | |
| 1657 | module_init(init_nfs_fs) |
| 1658 | module_exit(exit_nfs_fs) |