yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/9p/vfs_inode.c |
| 3 | * |
| 4 | * This file contains vfs inode ops for the 9P2000 protocol. |
| 5 | * |
| 6 | * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> |
| 7 | * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License version 2 |
| 11 | * as published by the Free Software Foundation. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to: |
| 20 | * Free Software Foundation |
| 21 | * 51 Franklin Street, Fifth Floor |
| 22 | * Boston, MA 02111-1301 USA |
| 23 | * |
| 24 | */ |
| 25 | |
| 26 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 27 | |
| 28 | #include <linux/module.h> |
| 29 | #include <linux/errno.h> |
| 30 | #include <linux/fs.h> |
| 31 | #include <linux/file.h> |
| 32 | #include <linux/pagemap.h> |
| 33 | #include <linux/stat.h> |
| 34 | #include <linux/string.h> |
| 35 | #include <linux/inet.h> |
| 36 | #include <linux/namei.h> |
| 37 | #include <linux/idr.h> |
| 38 | #include <linux/sched.h> |
| 39 | #include <linux/slab.h> |
| 40 | #include <linux/xattr.h> |
| 41 | #include <linux/posix_acl.h> |
| 42 | #include <net/9p/9p.h> |
| 43 | #include <net/9p/client.h> |
| 44 | |
| 45 | #include "v9fs.h" |
| 46 | #include "v9fs_vfs.h" |
| 47 | #include "fid.h" |
| 48 | #include "cache.h" |
| 49 | #include "xattr.h" |
| 50 | #include "acl.h" |
| 51 | |
| 52 | static const struct inode_operations v9fs_dir_inode_operations; |
| 53 | static const struct inode_operations v9fs_dir_inode_operations_dotu; |
| 54 | static const struct inode_operations v9fs_file_inode_operations; |
| 55 | static const struct inode_operations v9fs_symlink_inode_operations; |
| 56 | |
| 57 | /** |
| 58 | * unixmode2p9mode - convert unix mode bits to plan 9 |
| 59 | * @v9ses: v9fs session information |
| 60 | * @mode: mode to convert |
| 61 | * |
| 62 | */ |
| 63 | |
| 64 | static u32 unixmode2p9mode(struct v9fs_session_info *v9ses, umode_t mode) |
| 65 | { |
| 66 | int res; |
| 67 | res = mode & 0777; |
| 68 | if (S_ISDIR(mode)) |
| 69 | res |= P9_DMDIR; |
| 70 | if (v9fs_proto_dotu(v9ses)) { |
| 71 | if (v9ses->nodev == 0) { |
| 72 | if (S_ISSOCK(mode)) |
| 73 | res |= P9_DMSOCKET; |
| 74 | if (S_ISFIFO(mode)) |
| 75 | res |= P9_DMNAMEDPIPE; |
| 76 | if (S_ISBLK(mode)) |
| 77 | res |= P9_DMDEVICE; |
| 78 | if (S_ISCHR(mode)) |
| 79 | res |= P9_DMDEVICE; |
| 80 | } |
| 81 | |
| 82 | if ((mode & S_ISUID) == S_ISUID) |
| 83 | res |= P9_DMSETUID; |
| 84 | if ((mode & S_ISGID) == S_ISGID) |
| 85 | res |= P9_DMSETGID; |
| 86 | if ((mode & S_ISVTX) == S_ISVTX) |
| 87 | res |= P9_DMSETVTX; |
| 88 | } |
| 89 | return res; |
| 90 | } |
| 91 | |
| 92 | /** |
| 93 | * p9mode2perm- convert plan9 mode bits to unix permission bits |
| 94 | * @v9ses: v9fs session information |
| 95 | * @stat: p9_wstat from which mode need to be derived |
| 96 | * |
| 97 | */ |
| 98 | static int p9mode2perm(struct v9fs_session_info *v9ses, |
| 99 | struct p9_wstat *stat) |
| 100 | { |
| 101 | int res; |
| 102 | int mode = stat->mode; |
| 103 | |
| 104 | res = mode & S_IALLUGO; |
| 105 | if (v9fs_proto_dotu(v9ses)) { |
| 106 | if ((mode & P9_DMSETUID) == P9_DMSETUID) |
| 107 | res |= S_ISUID; |
| 108 | |
| 109 | if ((mode & P9_DMSETGID) == P9_DMSETGID) |
| 110 | res |= S_ISGID; |
| 111 | |
| 112 | if ((mode & P9_DMSETVTX) == P9_DMSETVTX) |
| 113 | res |= S_ISVTX; |
| 114 | } |
| 115 | return res; |
| 116 | } |
| 117 | |
| 118 | /** |
| 119 | * p9mode2unixmode- convert plan9 mode bits to unix mode bits |
| 120 | * @v9ses: v9fs session information |
| 121 | * @stat: p9_wstat from which mode need to be derived |
| 122 | * @rdev: major number, minor number in case of device files. |
| 123 | * |
| 124 | */ |
| 125 | static umode_t p9mode2unixmode(struct v9fs_session_info *v9ses, |
| 126 | struct p9_wstat *stat, dev_t *rdev) |
| 127 | { |
| 128 | int res; |
| 129 | u32 mode = stat->mode; |
| 130 | |
| 131 | *rdev = 0; |
| 132 | res = p9mode2perm(v9ses, stat); |
| 133 | |
| 134 | if ((mode & P9_DMDIR) == P9_DMDIR) |
| 135 | res |= S_IFDIR; |
| 136 | else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses))) |
| 137 | res |= S_IFLNK; |
| 138 | else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses)) |
| 139 | && (v9ses->nodev == 0)) |
| 140 | res |= S_IFSOCK; |
| 141 | else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses)) |
| 142 | && (v9ses->nodev == 0)) |
| 143 | res |= S_IFIFO; |
| 144 | else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses)) |
| 145 | && (v9ses->nodev == 0)) { |
| 146 | char type = 0, ext[32]; |
| 147 | int major = -1, minor = -1; |
| 148 | |
| 149 | strncpy(ext, stat->extension, sizeof(ext)); |
| 150 | sscanf(ext, "%c %u %u", &type, &major, &minor); |
| 151 | switch (type) { |
| 152 | case 'c': |
| 153 | res |= S_IFCHR; |
| 154 | break; |
| 155 | case 'b': |
| 156 | res |= S_IFBLK; |
| 157 | break; |
| 158 | default: |
| 159 | p9_debug(P9_DEBUG_ERROR, "Unknown special type %c %s\n", |
| 160 | type, stat->extension); |
| 161 | }; |
| 162 | *rdev = MKDEV(major, minor); |
| 163 | } else |
| 164 | res |= S_IFREG; |
| 165 | |
| 166 | return res; |
| 167 | } |
| 168 | |
| 169 | /** |
| 170 | * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits |
| 171 | * @uflags: flags to convert |
| 172 | * @extended: if .u extensions are active |
| 173 | */ |
| 174 | |
| 175 | int v9fs_uflags2omode(int uflags, int extended) |
| 176 | { |
| 177 | int ret; |
| 178 | |
| 179 | ret = 0; |
| 180 | switch (uflags&3) { |
| 181 | default: |
| 182 | case O_RDONLY: |
| 183 | ret = P9_OREAD; |
| 184 | break; |
| 185 | |
| 186 | case O_WRONLY: |
| 187 | ret = P9_OWRITE; |
| 188 | break; |
| 189 | |
| 190 | case O_RDWR: |
| 191 | ret = P9_ORDWR; |
| 192 | break; |
| 193 | } |
| 194 | |
| 195 | if (uflags & O_TRUNC) |
| 196 | ret |= P9_OTRUNC; |
| 197 | |
| 198 | if (extended) { |
| 199 | if (uflags & O_EXCL) |
| 200 | ret |= P9_OEXCL; |
| 201 | |
| 202 | if (uflags & O_APPEND) |
| 203 | ret |= P9_OAPPEND; |
| 204 | } |
| 205 | |
| 206 | return ret; |
| 207 | } |
| 208 | |
| 209 | /** |
| 210 | * v9fs_blank_wstat - helper function to setup a 9P stat structure |
| 211 | * @wstat: structure to initialize |
| 212 | * |
| 213 | */ |
| 214 | |
| 215 | void |
| 216 | v9fs_blank_wstat(struct p9_wstat *wstat) |
| 217 | { |
| 218 | wstat->type = ~0; |
| 219 | wstat->dev = ~0; |
| 220 | wstat->qid.type = ~0; |
| 221 | wstat->qid.version = ~0; |
| 222 | *((long long *)&wstat->qid.path) = ~0; |
| 223 | wstat->mode = ~0; |
| 224 | wstat->atime = ~0; |
| 225 | wstat->mtime = ~0; |
| 226 | wstat->length = ~0; |
| 227 | wstat->name = NULL; |
| 228 | wstat->uid = NULL; |
| 229 | wstat->gid = NULL; |
| 230 | wstat->muid = NULL; |
| 231 | wstat->n_uid = ~0; |
| 232 | wstat->n_gid = ~0; |
| 233 | wstat->n_muid = ~0; |
| 234 | wstat->extension = NULL; |
| 235 | } |
| 236 | |
| 237 | /** |
| 238 | * v9fs_alloc_inode - helper function to allocate an inode |
| 239 | * |
| 240 | */ |
| 241 | struct inode *v9fs_alloc_inode(struct super_block *sb) |
| 242 | { |
| 243 | struct v9fs_inode *v9inode; |
| 244 | v9inode = (struct v9fs_inode *)kmem_cache_alloc(v9fs_inode_cache, |
| 245 | GFP_KERNEL); |
| 246 | if (!v9inode) |
| 247 | return NULL; |
| 248 | #ifdef CONFIG_9P_FSCACHE |
| 249 | v9inode->fscache = NULL; |
| 250 | spin_lock_init(&v9inode->fscache_lock); |
| 251 | #endif |
| 252 | v9inode->writeback_fid = NULL; |
| 253 | v9inode->cache_validity = 0; |
| 254 | mutex_init(&v9inode->v_mutex); |
| 255 | return &v9inode->vfs_inode; |
| 256 | } |
| 257 | |
| 258 | /** |
| 259 | * v9fs_destroy_inode - destroy an inode |
| 260 | * |
| 261 | */ |
| 262 | |
| 263 | static void v9fs_i_callback(struct rcu_head *head) |
| 264 | { |
| 265 | struct inode *inode = container_of(head, struct inode, i_rcu); |
| 266 | kmem_cache_free(v9fs_inode_cache, V9FS_I(inode)); |
| 267 | } |
| 268 | |
| 269 | void v9fs_destroy_inode(struct inode *inode) |
| 270 | { |
| 271 | call_rcu(&inode->i_rcu, v9fs_i_callback); |
| 272 | } |
| 273 | |
| 274 | int v9fs_init_inode(struct v9fs_session_info *v9ses, |
| 275 | struct inode *inode, umode_t mode, dev_t rdev) |
| 276 | { |
| 277 | int err = 0; |
| 278 | |
| 279 | inode_init_owner(inode, NULL, mode); |
| 280 | inode->i_blocks = 0; |
| 281 | inode->i_rdev = rdev; |
| 282 | inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
| 283 | inode->i_mapping->a_ops = &v9fs_addr_operations; |
| 284 | |
| 285 | switch (mode & S_IFMT) { |
| 286 | case S_IFIFO: |
| 287 | case S_IFBLK: |
| 288 | case S_IFCHR: |
| 289 | case S_IFSOCK: |
| 290 | if (v9fs_proto_dotl(v9ses)) { |
| 291 | inode->i_op = &v9fs_file_inode_operations_dotl; |
| 292 | } else if (v9fs_proto_dotu(v9ses)) { |
| 293 | inode->i_op = &v9fs_file_inode_operations; |
| 294 | } else { |
| 295 | p9_debug(P9_DEBUG_ERROR, |
| 296 | "special files without extended mode\n"); |
| 297 | err = -EINVAL; |
| 298 | goto error; |
| 299 | } |
| 300 | init_special_inode(inode, inode->i_mode, inode->i_rdev); |
| 301 | break; |
| 302 | case S_IFREG: |
| 303 | if (v9fs_proto_dotl(v9ses)) { |
| 304 | inode->i_op = &v9fs_file_inode_operations_dotl; |
| 305 | if (v9ses->cache) |
| 306 | inode->i_fop = |
| 307 | &v9fs_cached_file_operations_dotl; |
| 308 | else |
| 309 | inode->i_fop = &v9fs_file_operations_dotl; |
| 310 | } else { |
| 311 | inode->i_op = &v9fs_file_inode_operations; |
| 312 | if (v9ses->cache) |
| 313 | inode->i_fop = &v9fs_cached_file_operations; |
| 314 | else |
| 315 | inode->i_fop = &v9fs_file_operations; |
| 316 | } |
| 317 | |
| 318 | break; |
| 319 | case S_IFLNK: |
| 320 | if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) { |
| 321 | p9_debug(P9_DEBUG_ERROR, |
| 322 | "extended modes used with legacy protocol\n"); |
| 323 | err = -EINVAL; |
| 324 | goto error; |
| 325 | } |
| 326 | |
| 327 | if (v9fs_proto_dotl(v9ses)) |
| 328 | inode->i_op = &v9fs_symlink_inode_operations_dotl; |
| 329 | else |
| 330 | inode->i_op = &v9fs_symlink_inode_operations; |
| 331 | |
| 332 | break; |
| 333 | case S_IFDIR: |
| 334 | inc_nlink(inode); |
| 335 | if (v9fs_proto_dotl(v9ses)) |
| 336 | inode->i_op = &v9fs_dir_inode_operations_dotl; |
| 337 | else if (v9fs_proto_dotu(v9ses)) |
| 338 | inode->i_op = &v9fs_dir_inode_operations_dotu; |
| 339 | else |
| 340 | inode->i_op = &v9fs_dir_inode_operations; |
| 341 | |
| 342 | if (v9fs_proto_dotl(v9ses)) |
| 343 | inode->i_fop = &v9fs_dir_operations_dotl; |
| 344 | else |
| 345 | inode->i_fop = &v9fs_dir_operations; |
| 346 | |
| 347 | break; |
| 348 | default: |
| 349 | p9_debug(P9_DEBUG_ERROR, "BAD mode 0x%hx S_IFMT 0x%x\n", |
| 350 | mode, mode & S_IFMT); |
| 351 | err = -EINVAL; |
| 352 | goto error; |
| 353 | } |
| 354 | error: |
| 355 | return err; |
| 356 | |
| 357 | } |
| 358 | |
| 359 | /** |
| 360 | * v9fs_get_inode - helper function to setup an inode |
| 361 | * @sb: superblock |
| 362 | * @mode: mode to setup inode with |
| 363 | * |
| 364 | */ |
| 365 | |
| 366 | struct inode *v9fs_get_inode(struct super_block *sb, umode_t mode, dev_t rdev) |
| 367 | { |
| 368 | int err; |
| 369 | struct inode *inode; |
| 370 | struct v9fs_session_info *v9ses = sb->s_fs_info; |
| 371 | |
| 372 | p9_debug(P9_DEBUG_VFS, "super block: %p mode: %ho\n", sb, mode); |
| 373 | |
| 374 | inode = new_inode(sb); |
| 375 | if (!inode) { |
| 376 | pr_warn("%s (%d): Problem allocating inode\n", |
| 377 | __func__, task_pid_nr(current)); |
| 378 | return ERR_PTR(-ENOMEM); |
| 379 | } |
| 380 | err = v9fs_init_inode(v9ses, inode, mode, rdev); |
| 381 | if (err) { |
| 382 | iput(inode); |
| 383 | return ERR_PTR(err); |
| 384 | } |
| 385 | return inode; |
| 386 | } |
| 387 | |
| 388 | /* |
| 389 | static struct v9fs_fid* |
| 390 | v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry) |
| 391 | { |
| 392 | int err; |
| 393 | int nfid; |
| 394 | struct v9fs_fid *ret; |
| 395 | struct v9fs_fcall *fcall; |
| 396 | |
| 397 | nfid = v9fs_get_idpool(&v9ses->fidpool); |
| 398 | if (nfid < 0) { |
| 399 | eprintk(KERN_WARNING, "no free fids available\n"); |
| 400 | return ERR_PTR(-ENOSPC); |
| 401 | } |
| 402 | |
| 403 | err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name, |
| 404 | &fcall); |
| 405 | |
| 406 | if (err < 0) { |
| 407 | if (fcall && fcall->id == RWALK) |
| 408 | goto clunk_fid; |
| 409 | |
| 410 | PRINT_FCALL_ERROR("walk error", fcall); |
| 411 | v9fs_put_idpool(nfid, &v9ses->fidpool); |
| 412 | goto error; |
| 413 | } |
| 414 | |
| 415 | kfree(fcall); |
| 416 | fcall = NULL; |
| 417 | ret = v9fs_fid_create(v9ses, nfid); |
| 418 | if (!ret) { |
| 419 | err = -ENOMEM; |
| 420 | goto clunk_fid; |
| 421 | } |
| 422 | |
| 423 | err = v9fs_fid_insert(ret, dentry); |
| 424 | if (err < 0) { |
| 425 | v9fs_fid_destroy(ret); |
| 426 | goto clunk_fid; |
| 427 | } |
| 428 | |
| 429 | return ret; |
| 430 | |
| 431 | clunk_fid: |
| 432 | v9fs_t_clunk(v9ses, nfid); |
| 433 | |
| 434 | error: |
| 435 | kfree(fcall); |
| 436 | return ERR_PTR(err); |
| 437 | } |
| 438 | */ |
| 439 | |
| 440 | |
| 441 | /** |
| 442 | * v9fs_clear_inode - release an inode |
| 443 | * @inode: inode to release |
| 444 | * |
| 445 | */ |
| 446 | void v9fs_evict_inode(struct inode *inode) |
| 447 | { |
| 448 | struct v9fs_inode *v9inode = V9FS_I(inode); |
| 449 | |
| 450 | truncate_inode_pages(inode->i_mapping, 0); |
| 451 | end_writeback(inode); |
| 452 | filemap_fdatawrite(inode->i_mapping); |
| 453 | |
| 454 | #ifdef CONFIG_9P_FSCACHE |
| 455 | v9fs_cache_inode_put_cookie(inode); |
| 456 | #endif |
| 457 | /* clunk the fid stashed in writeback_fid */ |
| 458 | if (v9inode->writeback_fid) { |
| 459 | p9_client_clunk(v9inode->writeback_fid); |
| 460 | v9inode->writeback_fid = NULL; |
| 461 | } |
| 462 | } |
| 463 | |
| 464 | static int v9fs_test_inode(struct inode *inode, void *data) |
| 465 | { |
| 466 | int umode; |
| 467 | dev_t rdev; |
| 468 | struct v9fs_inode *v9inode = V9FS_I(inode); |
| 469 | struct p9_wstat *st = (struct p9_wstat *)data; |
| 470 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode); |
| 471 | |
| 472 | umode = p9mode2unixmode(v9ses, st, &rdev); |
| 473 | /* don't match inode of different type */ |
| 474 | if ((inode->i_mode & S_IFMT) != (umode & S_IFMT)) |
| 475 | return 0; |
| 476 | |
| 477 | /* compare qid details */ |
| 478 | if (memcmp(&v9inode->qid.version, |
| 479 | &st->qid.version, sizeof(v9inode->qid.version))) |
| 480 | return 0; |
| 481 | |
| 482 | if (v9inode->qid.type != st->qid.type) |
| 483 | return 0; |
| 484 | return 1; |
| 485 | } |
| 486 | |
| 487 | static int v9fs_test_new_inode(struct inode *inode, void *data) |
| 488 | { |
| 489 | return 0; |
| 490 | } |
| 491 | |
| 492 | static int v9fs_set_inode(struct inode *inode, void *data) |
| 493 | { |
| 494 | struct v9fs_inode *v9inode = V9FS_I(inode); |
| 495 | struct p9_wstat *st = (struct p9_wstat *)data; |
| 496 | |
| 497 | memcpy(&v9inode->qid, &st->qid, sizeof(st->qid)); |
| 498 | return 0; |
| 499 | } |
| 500 | |
| 501 | static struct inode *v9fs_qid_iget(struct super_block *sb, |
| 502 | struct p9_qid *qid, |
| 503 | struct p9_wstat *st, |
| 504 | int new) |
| 505 | { |
| 506 | dev_t rdev; |
| 507 | int retval; |
| 508 | umode_t umode; |
| 509 | unsigned long i_ino; |
| 510 | struct inode *inode; |
| 511 | struct v9fs_session_info *v9ses = sb->s_fs_info; |
| 512 | int (*test)(struct inode *, void *); |
| 513 | |
| 514 | if (new) |
| 515 | test = v9fs_test_new_inode; |
| 516 | else |
| 517 | test = v9fs_test_inode; |
| 518 | |
| 519 | i_ino = v9fs_qid2ino(qid); |
| 520 | inode = iget5_locked(sb, i_ino, test, v9fs_set_inode, st); |
| 521 | if (!inode) |
| 522 | return ERR_PTR(-ENOMEM); |
| 523 | if (!(inode->i_state & I_NEW)) |
| 524 | return inode; |
| 525 | /* |
| 526 | * initialize the inode with the stat info |
| 527 | * FIXME!! we may need support for stale inodes |
| 528 | * later. |
| 529 | */ |
| 530 | inode->i_ino = i_ino; |
| 531 | umode = p9mode2unixmode(v9ses, st, &rdev); |
| 532 | retval = v9fs_init_inode(v9ses, inode, umode, rdev); |
| 533 | if (retval) |
| 534 | goto error; |
| 535 | |
| 536 | v9fs_stat2inode(st, inode, sb); |
| 537 | #ifdef CONFIG_9P_FSCACHE |
| 538 | v9fs_cache_inode_get_cookie(inode); |
| 539 | #endif |
| 540 | unlock_new_inode(inode); |
| 541 | return inode; |
| 542 | error: |
| 543 | unlock_new_inode(inode); |
| 544 | iput(inode); |
| 545 | return ERR_PTR(retval); |
| 546 | |
| 547 | } |
| 548 | |
| 549 | struct inode * |
| 550 | v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, |
| 551 | struct super_block *sb, int new) |
| 552 | { |
| 553 | struct p9_wstat *st; |
| 554 | struct inode *inode = NULL; |
| 555 | |
| 556 | st = p9_client_stat(fid); |
| 557 | if (IS_ERR(st)) |
| 558 | return ERR_CAST(st); |
| 559 | |
| 560 | inode = v9fs_qid_iget(sb, &st->qid, st, new); |
| 561 | p9stat_free(st); |
| 562 | kfree(st); |
| 563 | return inode; |
| 564 | } |
| 565 | |
| 566 | /** |
| 567 | * v9fs_at_to_dotl_flags- convert Linux specific AT flags to |
| 568 | * plan 9 AT flag. |
| 569 | * @flags: flags to convert |
| 570 | */ |
| 571 | static int v9fs_at_to_dotl_flags(int flags) |
| 572 | { |
| 573 | int rflags = 0; |
| 574 | if (flags & AT_REMOVEDIR) |
| 575 | rflags |= P9_DOTL_AT_REMOVEDIR; |
| 576 | return rflags; |
| 577 | } |
| 578 | |
| 579 | /** |
| 580 | * v9fs_remove - helper function to remove files and directories |
| 581 | * @dir: directory inode that is being deleted |
| 582 | * @dentry: dentry that is being deleted |
| 583 | * @rmdir: removing a directory |
| 584 | * |
| 585 | */ |
| 586 | |
| 587 | static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags) |
| 588 | { |
| 589 | struct inode *inode; |
| 590 | int retval = -EOPNOTSUPP; |
| 591 | struct p9_fid *v9fid, *dfid; |
| 592 | struct v9fs_session_info *v9ses; |
| 593 | |
| 594 | p9_debug(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n", |
| 595 | dir, dentry, flags); |
| 596 | |
| 597 | v9ses = v9fs_inode2v9ses(dir); |
| 598 | inode = dentry->d_inode; |
| 599 | dfid = v9fs_fid_lookup(dentry->d_parent); |
| 600 | if (IS_ERR(dfid)) { |
| 601 | retval = PTR_ERR(dfid); |
| 602 | p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", retval); |
| 603 | return retval; |
| 604 | } |
| 605 | if (v9fs_proto_dotl(v9ses)) |
| 606 | retval = p9_client_unlinkat(dfid, dentry->d_name.name, |
| 607 | v9fs_at_to_dotl_flags(flags)); |
| 608 | if (retval == -EOPNOTSUPP) { |
| 609 | /* Try the one based on path */ |
| 610 | v9fid = v9fs_fid_clone(dentry); |
| 611 | if (IS_ERR(v9fid)) |
| 612 | return PTR_ERR(v9fid); |
| 613 | retval = p9_client_remove(v9fid); |
| 614 | } |
| 615 | if (!retval) { |
| 616 | /* |
| 617 | * directories on unlink should have zero |
| 618 | * link count |
| 619 | */ |
| 620 | if (flags & AT_REMOVEDIR) { |
| 621 | clear_nlink(inode); |
| 622 | drop_nlink(dir); |
| 623 | } else |
| 624 | drop_nlink(inode); |
| 625 | |
| 626 | v9fs_invalidate_inode_attr(inode); |
| 627 | v9fs_invalidate_inode_attr(dir); |
| 628 | } |
| 629 | return retval; |
| 630 | } |
| 631 | |
| 632 | /** |
| 633 | * v9fs_create - Create a file |
| 634 | * @v9ses: session information |
| 635 | * @dir: directory that dentry is being created in |
| 636 | * @dentry: dentry that is being created |
| 637 | * @extension: 9p2000.u extension string to support devices, etc. |
| 638 | * @perm: create permissions |
| 639 | * @mode: open mode |
| 640 | * |
| 641 | */ |
| 642 | static struct p9_fid * |
| 643 | v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, |
| 644 | struct dentry *dentry, char *extension, u32 perm, u8 mode) |
| 645 | { |
| 646 | int err; |
| 647 | char *name; |
| 648 | struct p9_fid *dfid, *ofid, *fid; |
| 649 | struct inode *inode; |
| 650 | |
| 651 | p9_debug(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); |
| 652 | |
| 653 | err = 0; |
| 654 | ofid = NULL; |
| 655 | fid = NULL; |
| 656 | name = (char *) dentry->d_name.name; |
| 657 | dfid = v9fs_fid_lookup(dentry->d_parent); |
| 658 | if (IS_ERR(dfid)) { |
| 659 | err = PTR_ERR(dfid); |
| 660 | p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); |
| 661 | return ERR_PTR(err); |
| 662 | } |
| 663 | |
| 664 | /* clone a fid to use for creation */ |
| 665 | ofid = p9_client_walk(dfid, 0, NULL, 1); |
| 666 | if (IS_ERR(ofid)) { |
| 667 | err = PTR_ERR(ofid); |
| 668 | p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); |
| 669 | return ERR_PTR(err); |
| 670 | } |
| 671 | |
| 672 | err = p9_client_fcreate(ofid, name, perm, mode, extension); |
| 673 | if (err < 0) { |
| 674 | p9_debug(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err); |
| 675 | goto error; |
| 676 | } |
| 677 | |
| 678 | if (!(perm & P9_DMLINK)) { |
| 679 | /* now walk from the parent so we can get unopened fid */ |
| 680 | fid = p9_client_walk(dfid, 1, &name, 1); |
| 681 | if (IS_ERR(fid)) { |
| 682 | err = PTR_ERR(fid); |
| 683 | p9_debug(P9_DEBUG_VFS, |
| 684 | "p9_client_walk failed %d\n", err); |
| 685 | fid = NULL; |
| 686 | goto error; |
| 687 | } |
| 688 | /* |
| 689 | * instantiate inode and assign the unopened fid to the dentry |
| 690 | */ |
| 691 | inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); |
| 692 | if (IS_ERR(inode)) { |
| 693 | err = PTR_ERR(inode); |
| 694 | p9_debug(P9_DEBUG_VFS, |
| 695 | "inode creation failed %d\n", err); |
| 696 | goto error; |
| 697 | } |
| 698 | err = v9fs_fid_add(dentry, fid); |
| 699 | if (err < 0) |
| 700 | goto error; |
| 701 | d_instantiate(dentry, inode); |
| 702 | } |
| 703 | return ofid; |
| 704 | error: |
| 705 | if (ofid) |
| 706 | p9_client_clunk(ofid); |
| 707 | |
| 708 | if (fid) |
| 709 | p9_client_clunk(fid); |
| 710 | |
| 711 | return ERR_PTR(err); |
| 712 | } |
| 713 | |
| 714 | /** |
| 715 | * v9fs_vfs_create - VFS hook to create files |
| 716 | * @dir: directory inode that is being created |
| 717 | * @dentry: dentry that is being deleted |
| 718 | * @mode: create permissions |
| 719 | * @nd: path information |
| 720 | * |
| 721 | */ |
| 722 | |
| 723 | static int |
| 724 | v9fs_vfs_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
| 725 | struct nameidata *nd) |
| 726 | { |
| 727 | int err; |
| 728 | u32 perm; |
| 729 | int flags; |
| 730 | struct file *filp; |
| 731 | struct v9fs_inode *v9inode; |
| 732 | struct v9fs_session_info *v9ses; |
| 733 | struct p9_fid *fid, *inode_fid; |
| 734 | |
| 735 | err = 0; |
| 736 | fid = NULL; |
| 737 | v9ses = v9fs_inode2v9ses(dir); |
| 738 | perm = unixmode2p9mode(v9ses, mode); |
| 739 | if (nd) |
| 740 | flags = nd->intent.open.flags; |
| 741 | else |
| 742 | flags = O_RDWR; |
| 743 | |
| 744 | fid = v9fs_create(v9ses, dir, dentry, NULL, perm, |
| 745 | v9fs_uflags2omode(flags, |
| 746 | v9fs_proto_dotu(v9ses))); |
| 747 | if (IS_ERR(fid)) { |
| 748 | err = PTR_ERR(fid); |
| 749 | fid = NULL; |
| 750 | goto error; |
| 751 | } |
| 752 | |
| 753 | v9fs_invalidate_inode_attr(dir); |
| 754 | /* if we are opening a file, assign the open fid to the file */ |
| 755 | if (nd) { |
| 756 | v9inode = V9FS_I(dentry->d_inode); |
| 757 | mutex_lock(&v9inode->v_mutex); |
| 758 | if (v9ses->cache && !v9inode->writeback_fid && |
| 759 | ((flags & O_ACCMODE) != O_RDONLY)) { |
| 760 | /* |
| 761 | * clone a fid and add it to writeback_fid |
| 762 | * we do it during open time instead of |
| 763 | * page dirty time via write_begin/page_mkwrite |
| 764 | * because we want write after unlink usecase |
| 765 | * to work. |
| 766 | */ |
| 767 | inode_fid = v9fs_writeback_fid(dentry); |
| 768 | if (IS_ERR(inode_fid)) { |
| 769 | err = PTR_ERR(inode_fid); |
| 770 | mutex_unlock(&v9inode->v_mutex); |
| 771 | goto error; |
| 772 | } |
| 773 | v9inode->writeback_fid = (void *) inode_fid; |
| 774 | } |
| 775 | mutex_unlock(&v9inode->v_mutex); |
| 776 | filp = lookup_instantiate_filp(nd, dentry, generic_file_open); |
| 777 | if (IS_ERR(filp)) { |
| 778 | err = PTR_ERR(filp); |
| 779 | goto error; |
| 780 | } |
| 781 | |
| 782 | filp->private_data = fid; |
| 783 | #ifdef CONFIG_9P_FSCACHE |
| 784 | if (v9ses->cache) |
| 785 | v9fs_cache_inode_set_cookie(dentry->d_inode, filp); |
| 786 | #endif |
| 787 | } else |
| 788 | p9_client_clunk(fid); |
| 789 | |
| 790 | return 0; |
| 791 | |
| 792 | error: |
| 793 | if (fid) |
| 794 | p9_client_clunk(fid); |
| 795 | |
| 796 | return err; |
| 797 | } |
| 798 | |
| 799 | /** |
| 800 | * v9fs_vfs_mkdir - VFS mkdir hook to create a directory |
| 801 | * @dir: inode that is being unlinked |
| 802 | * @dentry: dentry that is being unlinked |
| 803 | * @mode: mode for new directory |
| 804 | * |
| 805 | */ |
| 806 | |
| 807 | static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
| 808 | { |
| 809 | int err; |
| 810 | u32 perm; |
| 811 | struct p9_fid *fid; |
| 812 | struct v9fs_session_info *v9ses; |
| 813 | |
| 814 | p9_debug(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); |
| 815 | err = 0; |
| 816 | v9ses = v9fs_inode2v9ses(dir); |
| 817 | perm = unixmode2p9mode(v9ses, mode | S_IFDIR); |
| 818 | fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); |
| 819 | if (IS_ERR(fid)) { |
| 820 | err = PTR_ERR(fid); |
| 821 | fid = NULL; |
| 822 | } else { |
| 823 | inc_nlink(dir); |
| 824 | v9fs_invalidate_inode_attr(dir); |
| 825 | } |
| 826 | |
| 827 | if (fid) |
| 828 | p9_client_clunk(fid); |
| 829 | |
| 830 | return err; |
| 831 | } |
| 832 | |
| 833 | /** |
| 834 | * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode |
| 835 | * @dir: inode that is being walked from |
| 836 | * @dentry: dentry that is being walked to? |
| 837 | * @nameidata: path data |
| 838 | * |
| 839 | */ |
| 840 | |
| 841 | struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, |
| 842 | struct nameidata *nameidata) |
| 843 | { |
| 844 | struct dentry *res; |
| 845 | struct super_block *sb; |
| 846 | struct v9fs_session_info *v9ses; |
| 847 | struct p9_fid *dfid, *fid; |
| 848 | struct inode *inode; |
| 849 | char *name; |
| 850 | int result = 0; |
| 851 | |
| 852 | p9_debug(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n", |
| 853 | dir, dentry->d_name.name, dentry, nameidata); |
| 854 | |
| 855 | if (dentry->d_name.len > NAME_MAX) |
| 856 | return ERR_PTR(-ENAMETOOLONG); |
| 857 | |
| 858 | sb = dir->i_sb; |
| 859 | v9ses = v9fs_inode2v9ses(dir); |
| 860 | /* We can walk d_parent because we hold the dir->i_mutex */ |
| 861 | dfid = v9fs_fid_lookup(dentry->d_parent); |
| 862 | if (IS_ERR(dfid)) |
| 863 | return ERR_CAST(dfid); |
| 864 | |
| 865 | name = (char *) dentry->d_name.name; |
| 866 | fid = p9_client_walk(dfid, 1, &name, 1); |
| 867 | if (IS_ERR(fid)) { |
| 868 | result = PTR_ERR(fid); |
| 869 | if (result == -ENOENT) { |
| 870 | inode = NULL; |
| 871 | goto inst_out; |
| 872 | } |
| 873 | |
| 874 | return ERR_PTR(result); |
| 875 | } |
| 876 | /* |
| 877 | * Make sure we don't use a wrong inode due to parallel |
| 878 | * unlink. For cached mode create calls request for new |
| 879 | * inode. But with cache disabled, lookup should do this. |
| 880 | */ |
| 881 | if (v9ses->cache) |
| 882 | inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb); |
| 883 | else |
| 884 | inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); |
| 885 | if (IS_ERR(inode)) { |
| 886 | result = PTR_ERR(inode); |
| 887 | inode = NULL; |
| 888 | goto error; |
| 889 | } |
| 890 | result = v9fs_fid_add(dentry, fid); |
| 891 | if (result < 0) |
| 892 | goto error_iput; |
| 893 | inst_out: |
| 894 | /* |
| 895 | * If we had a rename on the server and a parallel lookup |
| 896 | * for the new name, then make sure we instantiate with |
| 897 | * the new name. ie look up for a/b, while on server somebody |
| 898 | * moved b under k and client parallely did a lookup for |
| 899 | * k/b. |
| 900 | */ |
| 901 | res = d_materialise_unique(dentry, inode); |
| 902 | if (!IS_ERR(res)) |
| 903 | return res; |
| 904 | result = PTR_ERR(res); |
| 905 | error_iput: |
| 906 | iput(inode); |
| 907 | error: |
| 908 | p9_client_clunk(fid); |
| 909 | |
| 910 | return ERR_PTR(result); |
| 911 | } |
| 912 | |
| 913 | /** |
| 914 | * v9fs_vfs_unlink - VFS unlink hook to delete an inode |
| 915 | * @i: inode that is being unlinked |
| 916 | * @d: dentry that is being unlinked |
| 917 | * |
| 918 | */ |
| 919 | |
| 920 | int v9fs_vfs_unlink(struct inode *i, struct dentry *d) |
| 921 | { |
| 922 | return v9fs_remove(i, d, 0); |
| 923 | } |
| 924 | |
| 925 | /** |
| 926 | * v9fs_vfs_rmdir - VFS unlink hook to delete a directory |
| 927 | * @i: inode that is being unlinked |
| 928 | * @d: dentry that is being unlinked |
| 929 | * |
| 930 | */ |
| 931 | |
| 932 | int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) |
| 933 | { |
| 934 | return v9fs_remove(i, d, AT_REMOVEDIR); |
| 935 | } |
| 936 | |
| 937 | /** |
| 938 | * v9fs_vfs_rename - VFS hook to rename an inode |
| 939 | * @old_dir: old dir inode |
| 940 | * @old_dentry: old dentry |
| 941 | * @new_dir: new dir inode |
| 942 | * @new_dentry: new dentry |
| 943 | * |
| 944 | */ |
| 945 | |
| 946 | int |
| 947 | v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, |
| 948 | struct inode *new_dir, struct dentry *new_dentry) |
| 949 | { |
| 950 | int retval; |
| 951 | struct inode *old_inode; |
| 952 | struct inode *new_inode; |
| 953 | struct v9fs_session_info *v9ses; |
| 954 | struct p9_fid *oldfid; |
| 955 | struct p9_fid *olddirfid; |
| 956 | struct p9_fid *newdirfid; |
| 957 | struct p9_wstat wstat; |
| 958 | |
| 959 | p9_debug(P9_DEBUG_VFS, "\n"); |
| 960 | retval = 0; |
| 961 | old_inode = old_dentry->d_inode; |
| 962 | new_inode = new_dentry->d_inode; |
| 963 | v9ses = v9fs_inode2v9ses(old_inode); |
| 964 | oldfid = v9fs_fid_lookup(old_dentry); |
| 965 | if (IS_ERR(oldfid)) |
| 966 | return PTR_ERR(oldfid); |
| 967 | |
| 968 | olddirfid = v9fs_fid_clone(old_dentry->d_parent); |
| 969 | if (IS_ERR(olddirfid)) { |
| 970 | retval = PTR_ERR(olddirfid); |
| 971 | goto done; |
| 972 | } |
| 973 | |
| 974 | newdirfid = v9fs_fid_clone(new_dentry->d_parent); |
| 975 | if (IS_ERR(newdirfid)) { |
| 976 | retval = PTR_ERR(newdirfid); |
| 977 | goto clunk_olddir; |
| 978 | } |
| 979 | |
| 980 | down_write(&v9ses->rename_sem); |
| 981 | if (v9fs_proto_dotl(v9ses)) { |
| 982 | retval = p9_client_renameat(olddirfid, old_dentry->d_name.name, |
| 983 | newdirfid, new_dentry->d_name.name); |
| 984 | if (retval == -EOPNOTSUPP) |
| 985 | retval = p9_client_rename(oldfid, newdirfid, |
| 986 | new_dentry->d_name.name); |
| 987 | if (retval != -EOPNOTSUPP) |
| 988 | goto clunk_newdir; |
| 989 | } |
| 990 | if (old_dentry->d_parent != new_dentry->d_parent) { |
| 991 | /* |
| 992 | * 9P .u can only handle file rename in the same directory |
| 993 | */ |
| 994 | |
| 995 | p9_debug(P9_DEBUG_ERROR, "old dir and new dir are different\n"); |
| 996 | retval = -EXDEV; |
| 997 | goto clunk_newdir; |
| 998 | } |
| 999 | v9fs_blank_wstat(&wstat); |
| 1000 | wstat.muid = v9ses->uname; |
| 1001 | wstat.name = (char *) new_dentry->d_name.name; |
| 1002 | retval = p9_client_wstat(oldfid, &wstat); |
| 1003 | |
| 1004 | clunk_newdir: |
| 1005 | if (!retval) { |
| 1006 | if (new_inode) { |
| 1007 | if (S_ISDIR(new_inode->i_mode)) |
| 1008 | clear_nlink(new_inode); |
| 1009 | else |
| 1010 | drop_nlink(new_inode); |
| 1011 | } |
| 1012 | if (S_ISDIR(old_inode->i_mode)) { |
| 1013 | if (!new_inode) |
| 1014 | inc_nlink(new_dir); |
| 1015 | drop_nlink(old_dir); |
| 1016 | } |
| 1017 | v9fs_invalidate_inode_attr(old_inode); |
| 1018 | v9fs_invalidate_inode_attr(old_dir); |
| 1019 | v9fs_invalidate_inode_attr(new_dir); |
| 1020 | |
| 1021 | /* successful rename */ |
| 1022 | d_move(old_dentry, new_dentry); |
| 1023 | } |
| 1024 | up_write(&v9ses->rename_sem); |
| 1025 | p9_client_clunk(newdirfid); |
| 1026 | |
| 1027 | clunk_olddir: |
| 1028 | p9_client_clunk(olddirfid); |
| 1029 | |
| 1030 | done: |
| 1031 | return retval; |
| 1032 | } |
| 1033 | |
| 1034 | /** |
| 1035 | * v9fs_vfs_getattr - retrieve file metadata |
| 1036 | * @mnt: mount information |
| 1037 | * @dentry: file to get attributes on |
| 1038 | * @stat: metadata structure to populate |
| 1039 | * |
| 1040 | */ |
| 1041 | |
| 1042 | static int |
| 1043 | v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, |
| 1044 | struct kstat *stat) |
| 1045 | { |
| 1046 | int err; |
| 1047 | struct v9fs_session_info *v9ses; |
| 1048 | struct p9_fid *fid; |
| 1049 | struct p9_wstat *st; |
| 1050 | |
| 1051 | p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry); |
| 1052 | err = -EPERM; |
| 1053 | v9ses = v9fs_dentry2v9ses(dentry); |
| 1054 | if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { |
| 1055 | generic_fillattr(dentry->d_inode, stat); |
| 1056 | return 0; |
| 1057 | } |
| 1058 | fid = v9fs_fid_lookup(dentry); |
| 1059 | if (IS_ERR(fid)) |
| 1060 | return PTR_ERR(fid); |
| 1061 | |
| 1062 | st = p9_client_stat(fid); |
| 1063 | if (IS_ERR(st)) |
| 1064 | return PTR_ERR(st); |
| 1065 | |
| 1066 | v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb); |
| 1067 | generic_fillattr(dentry->d_inode, stat); |
| 1068 | |
| 1069 | p9stat_free(st); |
| 1070 | kfree(st); |
| 1071 | return 0; |
| 1072 | } |
| 1073 | |
| 1074 | /** |
| 1075 | * v9fs_vfs_setattr - set file metadata |
| 1076 | * @dentry: file whose metadata to set |
| 1077 | * @iattr: metadata assignment structure |
| 1078 | * |
| 1079 | */ |
| 1080 | |
| 1081 | static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) |
| 1082 | { |
| 1083 | int retval; |
| 1084 | struct v9fs_session_info *v9ses; |
| 1085 | struct p9_fid *fid; |
| 1086 | struct p9_wstat wstat; |
| 1087 | |
| 1088 | p9_debug(P9_DEBUG_VFS, "\n"); |
| 1089 | retval = inode_change_ok(dentry->d_inode, iattr); |
| 1090 | if (retval) |
| 1091 | return retval; |
| 1092 | |
| 1093 | retval = -EPERM; |
| 1094 | v9ses = v9fs_dentry2v9ses(dentry); |
| 1095 | fid = v9fs_fid_lookup(dentry); |
| 1096 | if(IS_ERR(fid)) |
| 1097 | return PTR_ERR(fid); |
| 1098 | |
| 1099 | v9fs_blank_wstat(&wstat); |
| 1100 | if (iattr->ia_valid & ATTR_MODE) |
| 1101 | wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); |
| 1102 | |
| 1103 | if (iattr->ia_valid & ATTR_MTIME) |
| 1104 | wstat.mtime = iattr->ia_mtime.tv_sec; |
| 1105 | |
| 1106 | if (iattr->ia_valid & ATTR_ATIME) |
| 1107 | wstat.atime = iattr->ia_atime.tv_sec; |
| 1108 | |
| 1109 | if (iattr->ia_valid & ATTR_SIZE) |
| 1110 | wstat.length = iattr->ia_size; |
| 1111 | |
| 1112 | if (v9fs_proto_dotu(v9ses)) { |
| 1113 | if (iattr->ia_valid & ATTR_UID) |
| 1114 | wstat.n_uid = iattr->ia_uid; |
| 1115 | |
| 1116 | if (iattr->ia_valid & ATTR_GID) |
| 1117 | wstat.n_gid = iattr->ia_gid; |
| 1118 | } |
| 1119 | |
| 1120 | /* Write all dirty data */ |
| 1121 | if (S_ISREG(dentry->d_inode->i_mode)) |
| 1122 | filemap_write_and_wait(dentry->d_inode->i_mapping); |
| 1123 | |
| 1124 | retval = p9_client_wstat(fid, &wstat); |
| 1125 | if (retval < 0) |
| 1126 | return retval; |
| 1127 | |
| 1128 | if ((iattr->ia_valid & ATTR_SIZE) && |
| 1129 | iattr->ia_size != i_size_read(dentry->d_inode)) |
| 1130 | truncate_setsize(dentry->d_inode, iattr->ia_size); |
| 1131 | |
| 1132 | v9fs_invalidate_inode_attr(dentry->d_inode); |
| 1133 | |
| 1134 | setattr_copy(dentry->d_inode, iattr); |
| 1135 | mark_inode_dirty(dentry->d_inode); |
| 1136 | return 0; |
| 1137 | } |
| 1138 | |
| 1139 | /** |
| 1140 | * v9fs_stat2inode - populate an inode structure with mistat info |
| 1141 | * @stat: Plan 9 metadata (mistat) structure |
| 1142 | * @inode: inode to populate |
| 1143 | * @sb: superblock of filesystem |
| 1144 | * |
| 1145 | */ |
| 1146 | |
| 1147 | void |
| 1148 | v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, |
| 1149 | struct super_block *sb) |
| 1150 | { |
| 1151 | umode_t mode; |
| 1152 | char ext[32]; |
| 1153 | char tag_name[14]; |
| 1154 | unsigned int i_nlink; |
| 1155 | struct v9fs_session_info *v9ses = sb->s_fs_info; |
| 1156 | struct v9fs_inode *v9inode = V9FS_I(inode); |
| 1157 | |
| 1158 | set_nlink(inode, 1); |
| 1159 | |
| 1160 | inode->i_atime.tv_sec = stat->atime; |
| 1161 | inode->i_mtime.tv_sec = stat->mtime; |
| 1162 | inode->i_ctime.tv_sec = stat->mtime; |
| 1163 | |
| 1164 | inode->i_uid = v9ses->dfltuid; |
| 1165 | inode->i_gid = v9ses->dfltgid; |
| 1166 | |
| 1167 | if (v9fs_proto_dotu(v9ses)) { |
| 1168 | inode->i_uid = stat->n_uid; |
| 1169 | inode->i_gid = stat->n_gid; |
| 1170 | } |
| 1171 | if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) { |
| 1172 | if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) { |
| 1173 | /* |
| 1174 | * Hadlink support got added later to |
| 1175 | * to the .u extension. So there can be |
| 1176 | * server out there that doesn't support |
| 1177 | * this even with .u extension. So check |
| 1178 | * for non NULL stat->extension |
| 1179 | */ |
| 1180 | strncpy(ext, stat->extension, sizeof(ext)); |
| 1181 | /* HARDLINKCOUNT %u */ |
| 1182 | sscanf(ext, "%13s %u", tag_name, &i_nlink); |
| 1183 | if (!strncmp(tag_name, "HARDLINKCOUNT", 13)) |
| 1184 | set_nlink(inode, i_nlink); |
| 1185 | } |
| 1186 | } |
| 1187 | mode = p9mode2perm(v9ses, stat); |
| 1188 | mode |= inode->i_mode & ~S_IALLUGO; |
| 1189 | inode->i_mode = mode; |
| 1190 | i_size_write(inode, stat->length); |
| 1191 | |
| 1192 | /* not real number of blocks, but 512 byte ones ... */ |
| 1193 | inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9; |
| 1194 | v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR; |
| 1195 | } |
| 1196 | |
| 1197 | /** |
| 1198 | * v9fs_qid2ino - convert qid into inode number |
| 1199 | * @qid: qid to hash |
| 1200 | * |
| 1201 | * BUG: potential for inode number collisions? |
| 1202 | */ |
| 1203 | |
| 1204 | ino_t v9fs_qid2ino(struct p9_qid *qid) |
| 1205 | { |
| 1206 | u64 path = qid->path + 2; |
| 1207 | ino_t i = 0; |
| 1208 | |
| 1209 | if (sizeof(ino_t) == sizeof(path)) |
| 1210 | memcpy(&i, &path, sizeof(ino_t)); |
| 1211 | else |
| 1212 | i = (ino_t) (path ^ (path >> 32)); |
| 1213 | |
| 1214 | return i; |
| 1215 | } |
| 1216 | |
| 1217 | /** |
| 1218 | * v9fs_readlink - read a symlink's location (internal version) |
| 1219 | * @dentry: dentry for symlink |
| 1220 | * @buffer: buffer to load symlink location into |
| 1221 | * @buflen: length of buffer |
| 1222 | * |
| 1223 | */ |
| 1224 | |
| 1225 | static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) |
| 1226 | { |
| 1227 | int retval; |
| 1228 | |
| 1229 | struct v9fs_session_info *v9ses; |
| 1230 | struct p9_fid *fid; |
| 1231 | struct p9_wstat *st; |
| 1232 | |
| 1233 | p9_debug(P9_DEBUG_VFS, " %s\n", dentry->d_name.name); |
| 1234 | retval = -EPERM; |
| 1235 | v9ses = v9fs_dentry2v9ses(dentry); |
| 1236 | fid = v9fs_fid_lookup(dentry); |
| 1237 | if (IS_ERR(fid)) |
| 1238 | return PTR_ERR(fid); |
| 1239 | |
| 1240 | if (!v9fs_proto_dotu(v9ses)) |
| 1241 | return -EBADF; |
| 1242 | |
| 1243 | st = p9_client_stat(fid); |
| 1244 | if (IS_ERR(st)) |
| 1245 | return PTR_ERR(st); |
| 1246 | |
| 1247 | if (!(st->mode & P9_DMSYMLINK)) { |
| 1248 | retval = -EINVAL; |
| 1249 | goto done; |
| 1250 | } |
| 1251 | |
| 1252 | /* copy extension buffer into buffer */ |
| 1253 | strncpy(buffer, st->extension, buflen); |
| 1254 | |
| 1255 | p9_debug(P9_DEBUG_VFS, "%s -> %s (%s)\n", |
| 1256 | dentry->d_name.name, st->extension, buffer); |
| 1257 | |
| 1258 | retval = strnlen(buffer, buflen); |
| 1259 | done: |
| 1260 | p9stat_free(st); |
| 1261 | kfree(st); |
| 1262 | return retval; |
| 1263 | } |
| 1264 | |
| 1265 | /** |
| 1266 | * v9fs_vfs_follow_link - follow a symlink path |
| 1267 | * @dentry: dentry for symlink |
| 1268 | * @nd: nameidata |
| 1269 | * |
| 1270 | */ |
| 1271 | |
| 1272 | static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) |
| 1273 | { |
| 1274 | int len = 0; |
| 1275 | char *link = __getname(); |
| 1276 | |
| 1277 | p9_debug(P9_DEBUG_VFS, "%s\n", dentry->d_name.name); |
| 1278 | |
| 1279 | if (!link) |
| 1280 | link = ERR_PTR(-ENOMEM); |
| 1281 | else { |
| 1282 | len = v9fs_readlink(dentry, link, PATH_MAX); |
| 1283 | |
| 1284 | if (len < 0) { |
| 1285 | __putname(link); |
| 1286 | link = ERR_PTR(len); |
| 1287 | } else |
| 1288 | link[min(len, PATH_MAX-1)] = 0; |
| 1289 | } |
| 1290 | nd_set_link(nd, link); |
| 1291 | |
| 1292 | return NULL; |
| 1293 | } |
| 1294 | |
| 1295 | /** |
| 1296 | * v9fs_vfs_put_link - release a symlink path |
| 1297 | * @dentry: dentry for symlink |
| 1298 | * @nd: nameidata |
| 1299 | * @p: unused |
| 1300 | * |
| 1301 | */ |
| 1302 | |
| 1303 | void |
| 1304 | v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) |
| 1305 | { |
| 1306 | char *s = nd_get_link(nd); |
| 1307 | |
| 1308 | p9_debug(P9_DEBUG_VFS, " %s %s\n", |
| 1309 | dentry->d_name.name, IS_ERR(s) ? "<error>" : s); |
| 1310 | if (!IS_ERR(s)) |
| 1311 | __putname(s); |
| 1312 | } |
| 1313 | |
| 1314 | /** |
| 1315 | * v9fs_vfs_mkspecial - create a special file |
| 1316 | * @dir: inode to create special file in |
| 1317 | * @dentry: dentry to create |
| 1318 | * @mode: mode to create special file |
| 1319 | * @extension: 9p2000.u format extension string representing special file |
| 1320 | * |
| 1321 | */ |
| 1322 | |
| 1323 | static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, |
| 1324 | u32 perm, const char *extension) |
| 1325 | { |
| 1326 | struct p9_fid *fid; |
| 1327 | struct v9fs_session_info *v9ses; |
| 1328 | |
| 1329 | v9ses = v9fs_inode2v9ses(dir); |
| 1330 | if (!v9fs_proto_dotu(v9ses)) { |
| 1331 | p9_debug(P9_DEBUG_ERROR, "not extended\n"); |
| 1332 | return -EPERM; |
| 1333 | } |
| 1334 | |
| 1335 | fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, |
| 1336 | P9_OREAD); |
| 1337 | if (IS_ERR(fid)) |
| 1338 | return PTR_ERR(fid); |
| 1339 | |
| 1340 | v9fs_invalidate_inode_attr(dir); |
| 1341 | p9_client_clunk(fid); |
| 1342 | return 0; |
| 1343 | } |
| 1344 | |
| 1345 | /** |
| 1346 | * v9fs_vfs_symlink - helper function to create symlinks |
| 1347 | * @dir: directory inode containing symlink |
| 1348 | * @dentry: dentry for symlink |
| 1349 | * @symname: symlink data |
| 1350 | * |
| 1351 | * See Also: 9P2000.u RFC for more information |
| 1352 | * |
| 1353 | */ |
| 1354 | |
| 1355 | static int |
| 1356 | v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) |
| 1357 | { |
| 1358 | p9_debug(P9_DEBUG_VFS, " %lu,%s,%s\n", |
| 1359 | dir->i_ino, dentry->d_name.name, symname); |
| 1360 | |
| 1361 | return v9fs_vfs_mkspecial(dir, dentry, P9_DMSYMLINK, symname); |
| 1362 | } |
| 1363 | |
| 1364 | /** |
| 1365 | * v9fs_vfs_link - create a hardlink |
| 1366 | * @old_dentry: dentry for file to link to |
| 1367 | * @dir: inode destination for new link |
| 1368 | * @dentry: dentry for link |
| 1369 | * |
| 1370 | */ |
| 1371 | |
| 1372 | static int |
| 1373 | v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, |
| 1374 | struct dentry *dentry) |
| 1375 | { |
| 1376 | int retval; |
| 1377 | char *name; |
| 1378 | struct p9_fid *oldfid; |
| 1379 | |
| 1380 | p9_debug(P9_DEBUG_VFS, " %lu,%s,%s\n", |
| 1381 | dir->i_ino, dentry->d_name.name, old_dentry->d_name.name); |
| 1382 | |
| 1383 | oldfid = v9fs_fid_clone(old_dentry); |
| 1384 | if (IS_ERR(oldfid)) |
| 1385 | return PTR_ERR(oldfid); |
| 1386 | |
| 1387 | name = __getname(); |
| 1388 | if (unlikely(!name)) { |
| 1389 | retval = -ENOMEM; |
| 1390 | goto clunk_fid; |
| 1391 | } |
| 1392 | |
| 1393 | sprintf(name, "%d\n", oldfid->fid); |
| 1394 | retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); |
| 1395 | __putname(name); |
| 1396 | if (!retval) { |
| 1397 | v9fs_refresh_inode(oldfid, old_dentry->d_inode); |
| 1398 | v9fs_invalidate_inode_attr(dir); |
| 1399 | } |
| 1400 | clunk_fid: |
| 1401 | p9_client_clunk(oldfid); |
| 1402 | return retval; |
| 1403 | } |
| 1404 | |
| 1405 | /** |
| 1406 | * v9fs_vfs_mknod - create a special file |
| 1407 | * @dir: inode destination for new link |
| 1408 | * @dentry: dentry for file |
| 1409 | * @mode: mode for creation |
| 1410 | * @rdev: device associated with special file |
| 1411 | * |
| 1412 | */ |
| 1413 | |
| 1414 | static int |
| 1415 | v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev) |
| 1416 | { |
| 1417 | struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); |
| 1418 | int retval; |
| 1419 | char *name; |
| 1420 | u32 perm; |
| 1421 | |
| 1422 | p9_debug(P9_DEBUG_VFS, " %lu,%s mode: %hx MAJOR: %u MINOR: %u\n", |
| 1423 | dir->i_ino, dentry->d_name.name, mode, |
| 1424 | MAJOR(rdev), MINOR(rdev)); |
| 1425 | |
| 1426 | if (!new_valid_dev(rdev)) |
| 1427 | return -EINVAL; |
| 1428 | |
| 1429 | name = __getname(); |
| 1430 | if (!name) |
| 1431 | return -ENOMEM; |
| 1432 | /* build extension */ |
| 1433 | if (S_ISBLK(mode)) |
| 1434 | sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); |
| 1435 | else if (S_ISCHR(mode)) |
| 1436 | sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); |
| 1437 | else if (S_ISFIFO(mode)) |
| 1438 | *name = 0; |
| 1439 | else if (S_ISSOCK(mode)) |
| 1440 | *name = 0; |
| 1441 | else { |
| 1442 | __putname(name); |
| 1443 | return -EINVAL; |
| 1444 | } |
| 1445 | |
| 1446 | perm = unixmode2p9mode(v9ses, mode); |
| 1447 | retval = v9fs_vfs_mkspecial(dir, dentry, perm, name); |
| 1448 | __putname(name); |
| 1449 | |
| 1450 | return retval; |
| 1451 | } |
| 1452 | |
| 1453 | int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode) |
| 1454 | { |
| 1455 | int umode; |
| 1456 | dev_t rdev; |
| 1457 | loff_t i_size; |
| 1458 | struct p9_wstat *st; |
| 1459 | struct v9fs_session_info *v9ses; |
| 1460 | |
| 1461 | v9ses = v9fs_inode2v9ses(inode); |
| 1462 | st = p9_client_stat(fid); |
| 1463 | if (IS_ERR(st)) |
| 1464 | return PTR_ERR(st); |
| 1465 | /* |
| 1466 | * Don't update inode if the file type is different |
| 1467 | */ |
| 1468 | umode = p9mode2unixmode(v9ses, st, &rdev); |
| 1469 | if ((inode->i_mode & S_IFMT) != (umode & S_IFMT)) |
| 1470 | goto out; |
| 1471 | |
| 1472 | spin_lock(&inode->i_lock); |
| 1473 | /* |
| 1474 | * We don't want to refresh inode->i_size, |
| 1475 | * because we may have cached data |
| 1476 | */ |
| 1477 | i_size = inode->i_size; |
| 1478 | v9fs_stat2inode(st, inode, inode->i_sb); |
| 1479 | if (v9ses->cache) |
| 1480 | inode->i_size = i_size; |
| 1481 | spin_unlock(&inode->i_lock); |
| 1482 | out: |
| 1483 | p9stat_free(st); |
| 1484 | kfree(st); |
| 1485 | return 0; |
| 1486 | } |
| 1487 | |
| 1488 | static const struct inode_operations v9fs_dir_inode_operations_dotu = { |
| 1489 | .create = v9fs_vfs_create, |
| 1490 | .lookup = v9fs_vfs_lookup, |
| 1491 | .symlink = v9fs_vfs_symlink, |
| 1492 | .link = v9fs_vfs_link, |
| 1493 | .unlink = v9fs_vfs_unlink, |
| 1494 | .mkdir = v9fs_vfs_mkdir, |
| 1495 | .rmdir = v9fs_vfs_rmdir, |
| 1496 | .mknod = v9fs_vfs_mknod, |
| 1497 | .rename = v9fs_vfs_rename, |
| 1498 | .getattr = v9fs_vfs_getattr, |
| 1499 | .setattr = v9fs_vfs_setattr, |
| 1500 | }; |
| 1501 | |
| 1502 | static const struct inode_operations v9fs_dir_inode_operations = { |
| 1503 | .create = v9fs_vfs_create, |
| 1504 | .lookup = v9fs_vfs_lookup, |
| 1505 | .unlink = v9fs_vfs_unlink, |
| 1506 | .mkdir = v9fs_vfs_mkdir, |
| 1507 | .rmdir = v9fs_vfs_rmdir, |
| 1508 | .mknod = v9fs_vfs_mknod, |
| 1509 | .rename = v9fs_vfs_rename, |
| 1510 | .getattr = v9fs_vfs_getattr, |
| 1511 | .setattr = v9fs_vfs_setattr, |
| 1512 | }; |
| 1513 | |
| 1514 | static const struct inode_operations v9fs_file_inode_operations = { |
| 1515 | .getattr = v9fs_vfs_getattr, |
| 1516 | .setattr = v9fs_vfs_setattr, |
| 1517 | }; |
| 1518 | |
| 1519 | static const struct inode_operations v9fs_symlink_inode_operations = { |
| 1520 | .readlink = generic_readlink, |
| 1521 | .follow_link = v9fs_vfs_follow_link, |
| 1522 | .put_link = v9fs_vfs_put_link, |
| 1523 | .getattr = v9fs_vfs_getattr, |
| 1524 | .setattr = v9fs_vfs_setattr, |
| 1525 | }; |
| 1526 | |