| 1 | /* |
| 2 | * linux/fs/9p/vfs_inode_dotl.c |
| 3 | * |
| 4 | * This file contains vfs inode ops for the 9P2000.L 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 | #include <linux/module.h> |
| 27 | #include <linux/errno.h> |
| 28 | #include <linux/fs.h> |
| 29 | #include <linux/file.h> |
| 30 | #include <linux/pagemap.h> |
| 31 | #include <linux/stat.h> |
| 32 | #include <linux/string.h> |
| 33 | #include <linux/inet.h> |
| 34 | #include <linux/namei.h> |
| 35 | #include <linux/idr.h> |
| 36 | #include <linux/sched.h> |
| 37 | #include <linux/slab.h> |
| 38 | #include <linux/xattr.h> |
| 39 | #include <linux/posix_acl.h> |
| 40 | #include <net/9p/9p.h> |
| 41 | #include <net/9p/client.h> |
| 42 | |
| 43 | #include "v9fs.h" |
| 44 | #include "v9fs_vfs.h" |
| 45 | #include "fid.h" |
| 46 | #include "cache.h" |
| 47 | #include "xattr.h" |
| 48 | #include "acl.h" |
| 49 | |
| 50 | static int |
| 51 | v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode, |
| 52 | dev_t rdev); |
| 53 | |
| 54 | /** |
| 55 | * v9fs_get_fsgid_for_create - Helper function to get the gid for creating a |
| 56 | * new file system object. This checks the S_ISGID to determine the owning |
| 57 | * group of the new file system object. |
| 58 | */ |
| 59 | |
| 60 | static kgid_t v9fs_get_fsgid_for_create(struct inode *dir_inode) |
| 61 | { |
| 62 | BUG_ON(dir_inode == NULL); |
| 63 | |
| 64 | if (dir_inode->i_mode & S_ISGID) { |
| 65 | /* set_gid bit is set.*/ |
| 66 | return dir_inode->i_gid; |
| 67 | } |
| 68 | return current_fsgid(); |
| 69 | } |
| 70 | |
| 71 | static int v9fs_test_inode_dotl(struct inode *inode, void *data) |
| 72 | { |
| 73 | struct v9fs_inode *v9inode = V9FS_I(inode); |
| 74 | struct p9_stat_dotl *st = (struct p9_stat_dotl *)data; |
| 75 | |
| 76 | /* don't match inode of different type */ |
| 77 | if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT)) |
| 78 | return 0; |
| 79 | |
| 80 | if (inode->i_generation != st->st_gen) |
| 81 | return 0; |
| 82 | |
| 83 | /* compare qid details */ |
| 84 | if (memcmp(&v9inode->qid.version, |
| 85 | &st->qid.version, sizeof(v9inode->qid.version))) |
| 86 | return 0; |
| 87 | |
| 88 | if (v9inode->qid.type != st->qid.type) |
| 89 | return 0; |
| 90 | return 1; |
| 91 | } |
| 92 | |
| 93 | /* Always get a new inode */ |
| 94 | static int v9fs_test_new_inode_dotl(struct inode *inode, void *data) |
| 95 | { |
| 96 | return 0; |
| 97 | } |
| 98 | |
| 99 | static int v9fs_set_inode_dotl(struct inode *inode, void *data) |
| 100 | { |
| 101 | struct v9fs_inode *v9inode = V9FS_I(inode); |
| 102 | struct p9_stat_dotl *st = (struct p9_stat_dotl *)data; |
| 103 | |
| 104 | memcpy(&v9inode->qid, &st->qid, sizeof(st->qid)); |
| 105 | inode->i_generation = st->st_gen; |
| 106 | return 0; |
| 107 | } |
| 108 | |
| 109 | static struct inode *v9fs_qid_iget_dotl(struct super_block *sb, |
| 110 | struct p9_qid *qid, |
| 111 | struct p9_fid *fid, |
| 112 | struct p9_stat_dotl *st, |
| 113 | int new) |
| 114 | { |
| 115 | int retval; |
| 116 | unsigned long i_ino; |
| 117 | struct inode *inode; |
| 118 | struct v9fs_session_info *v9ses = sb->s_fs_info; |
| 119 | int (*test)(struct inode *, void *); |
| 120 | |
| 121 | if (new) |
| 122 | test = v9fs_test_new_inode_dotl; |
| 123 | else |
| 124 | test = v9fs_test_inode_dotl; |
| 125 | |
| 126 | i_ino = v9fs_qid2ino(qid); |
| 127 | inode = iget5_locked(sb, i_ino, test, v9fs_set_inode_dotl, st); |
| 128 | if (!inode) |
| 129 | return ERR_PTR(-ENOMEM); |
| 130 | if (!(inode->i_state & I_NEW)) |
| 131 | return inode; |
| 132 | /* |
| 133 | * initialize the inode with the stat info |
| 134 | * FIXME!! we may need support for stale inodes |
| 135 | * later. |
| 136 | */ |
| 137 | inode->i_ino = i_ino; |
| 138 | retval = v9fs_init_inode(v9ses, inode, |
| 139 | st->st_mode, new_decode_dev(st->st_rdev)); |
| 140 | if (retval) |
| 141 | goto error; |
| 142 | |
| 143 | v9fs_stat2inode_dotl(st, inode); |
| 144 | v9fs_cache_inode_get_cookie(inode); |
| 145 | retval = v9fs_get_acl(inode, fid); |
| 146 | if (retval) |
| 147 | goto error; |
| 148 | |
| 149 | unlock_new_inode(inode); |
| 150 | return inode; |
| 151 | error: |
| 152 | iget_failed(inode); |
| 153 | return ERR_PTR(retval); |
| 154 | |
| 155 | } |
| 156 | |
| 157 | struct inode * |
| 158 | v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid, |
| 159 | struct super_block *sb, int new) |
| 160 | { |
| 161 | struct p9_stat_dotl *st; |
| 162 | struct inode *inode = NULL; |
| 163 | |
| 164 | st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN); |
| 165 | if (IS_ERR(st)) |
| 166 | return ERR_CAST(st); |
| 167 | |
| 168 | inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st, new); |
| 169 | kfree(st); |
| 170 | return inode; |
| 171 | } |
| 172 | |
| 173 | struct dotl_openflag_map { |
| 174 | int open_flag; |
| 175 | int dotl_flag; |
| 176 | }; |
| 177 | |
| 178 | static int v9fs_mapped_dotl_flags(int flags) |
| 179 | { |
| 180 | int i; |
| 181 | int rflags = 0; |
| 182 | struct dotl_openflag_map dotl_oflag_map[] = { |
| 183 | { O_CREAT, P9_DOTL_CREATE }, |
| 184 | { O_EXCL, P9_DOTL_EXCL }, |
| 185 | { O_NOCTTY, P9_DOTL_NOCTTY }, |
| 186 | { O_APPEND, P9_DOTL_APPEND }, |
| 187 | { O_NONBLOCK, P9_DOTL_NONBLOCK }, |
| 188 | { O_DSYNC, P9_DOTL_DSYNC }, |
| 189 | { FASYNC, P9_DOTL_FASYNC }, |
| 190 | { O_DIRECT, P9_DOTL_DIRECT }, |
| 191 | { O_LARGEFILE, P9_DOTL_LARGEFILE }, |
| 192 | { O_DIRECTORY, P9_DOTL_DIRECTORY }, |
| 193 | { O_NOFOLLOW, P9_DOTL_NOFOLLOW }, |
| 194 | { O_NOATIME, P9_DOTL_NOATIME }, |
| 195 | { O_CLOEXEC, P9_DOTL_CLOEXEC }, |
| 196 | { O_SYNC, P9_DOTL_SYNC}, |
| 197 | }; |
| 198 | for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) { |
| 199 | if (flags & dotl_oflag_map[i].open_flag) |
| 200 | rflags |= dotl_oflag_map[i].dotl_flag; |
| 201 | } |
| 202 | return rflags; |
| 203 | } |
| 204 | |
| 205 | /** |
| 206 | * v9fs_open_to_dotl_flags- convert Linux specific open flags to |
| 207 | * plan 9 open flag. |
| 208 | * @flags: flags to convert |
| 209 | */ |
| 210 | int v9fs_open_to_dotl_flags(int flags) |
| 211 | { |
| 212 | int rflags = 0; |
| 213 | |
| 214 | /* |
| 215 | * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY |
| 216 | * and P9_DOTL_NOACCESS |
| 217 | */ |
| 218 | rflags |= flags & O_ACCMODE; |
| 219 | rflags |= v9fs_mapped_dotl_flags(flags); |
| 220 | |
| 221 | return rflags; |
| 222 | } |
| 223 | |
| 224 | /** |
| 225 | * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol. |
| 226 | * @dir: directory inode that is being created |
| 227 | * @dentry: dentry that is being deleted |
| 228 | * @omode: create permissions |
| 229 | * |
| 230 | */ |
| 231 | |
| 232 | static int |
| 233 | v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, umode_t omode, |
| 234 | bool excl) |
| 235 | { |
| 236 | return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0); |
| 237 | } |
| 238 | |
| 239 | static int |
| 240 | v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry, |
| 241 | struct file *file, unsigned flags, umode_t omode, |
| 242 | int *opened) |
| 243 | { |
| 244 | int err = 0; |
| 245 | kgid_t gid; |
| 246 | umode_t mode; |
| 247 | char *name = NULL; |
| 248 | struct p9_qid qid; |
| 249 | struct inode *inode; |
| 250 | struct p9_fid *fid = NULL; |
| 251 | struct v9fs_inode *v9inode; |
| 252 | struct p9_fid *dfid, *ofid, *inode_fid; |
| 253 | struct v9fs_session_info *v9ses; |
| 254 | struct posix_acl *pacl = NULL, *dacl = NULL; |
| 255 | struct dentry *res = NULL; |
| 256 | |
| 257 | if (d_in_lookup(dentry)) { |
| 258 | res = v9fs_vfs_lookup(dir, dentry, 0); |
| 259 | if (IS_ERR(res)) |
| 260 | return PTR_ERR(res); |
| 261 | |
| 262 | if (res) |
| 263 | dentry = res; |
| 264 | } |
| 265 | |
| 266 | /* Only creates */ |
| 267 | if (!(flags & O_CREAT) || d_really_is_positive(dentry)) |
| 268 | return finish_no_open(file, res); |
| 269 | |
| 270 | v9ses = v9fs_inode2v9ses(dir); |
| 271 | |
| 272 | name = (char *) dentry->d_name.name; |
| 273 | p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%hx\n", |
| 274 | name, flags, omode); |
| 275 | |
| 276 | dfid = v9fs_parent_fid(dentry); |
| 277 | if (IS_ERR(dfid)) { |
| 278 | err = PTR_ERR(dfid); |
| 279 | p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); |
| 280 | goto out; |
| 281 | } |
| 282 | |
| 283 | /* clone a fid to use for creation */ |
| 284 | ofid = clone_fid(dfid); |
| 285 | if (IS_ERR(ofid)) { |
| 286 | err = PTR_ERR(ofid); |
| 287 | p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); |
| 288 | goto out; |
| 289 | } |
| 290 | |
| 291 | gid = v9fs_get_fsgid_for_create(dir); |
| 292 | |
| 293 | mode = omode; |
| 294 | /* Update mode based on ACL value */ |
| 295 | err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); |
| 296 | if (err) { |
| 297 | p9_debug(P9_DEBUG_VFS, "Failed to get acl values in creat %d\n", |
| 298 | err); |
| 299 | goto error; |
| 300 | } |
| 301 | err = p9_client_create_dotl(ofid, name, v9fs_open_to_dotl_flags(flags), |
| 302 | mode, gid, &qid); |
| 303 | if (err < 0) { |
| 304 | p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in creat %d\n", |
| 305 | err); |
| 306 | goto error; |
| 307 | } |
| 308 | v9fs_invalidate_inode_attr(dir); |
| 309 | |
| 310 | /* instantiate inode and assign the unopened fid to the dentry */ |
| 311 | fid = p9_client_walk(dfid, 1, &name, 1); |
| 312 | if (IS_ERR(fid)) { |
| 313 | err = PTR_ERR(fid); |
| 314 | p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); |
| 315 | fid = NULL; |
| 316 | goto error; |
| 317 | } |
| 318 | inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); |
| 319 | if (IS_ERR(inode)) { |
| 320 | err = PTR_ERR(inode); |
| 321 | p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err); |
| 322 | goto error; |
| 323 | } |
| 324 | /* Now set the ACL based on the default value */ |
| 325 | v9fs_set_create_acl(inode, fid, dacl, pacl); |
| 326 | |
| 327 | v9fs_fid_add(dentry, fid); |
| 328 | d_instantiate(dentry, inode); |
| 329 | |
| 330 | v9inode = V9FS_I(inode); |
| 331 | mutex_lock(&v9inode->v_mutex); |
| 332 | if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) && |
| 333 | !v9inode->writeback_fid && |
| 334 | ((flags & O_ACCMODE) != O_RDONLY)) { |
| 335 | /* |
| 336 | * clone a fid and add it to writeback_fid |
| 337 | * we do it during open time instead of |
| 338 | * page dirty time via write_begin/page_mkwrite |
| 339 | * because we want write after unlink usecase |
| 340 | * to work. |
| 341 | */ |
| 342 | inode_fid = v9fs_writeback_fid(dentry); |
| 343 | if (IS_ERR(inode_fid)) { |
| 344 | err = PTR_ERR(inode_fid); |
| 345 | mutex_unlock(&v9inode->v_mutex); |
| 346 | goto err_clunk_old_fid; |
| 347 | } |
| 348 | v9inode->writeback_fid = (void *) inode_fid; |
| 349 | } |
| 350 | mutex_unlock(&v9inode->v_mutex); |
| 351 | /* Since we are opening a file, assign the open fid to the file */ |
| 352 | err = finish_open(file, dentry, generic_file_open, opened); |
| 353 | if (err) |
| 354 | goto err_clunk_old_fid; |
| 355 | file->private_data = ofid; |
| 356 | if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) |
| 357 | v9fs_cache_inode_set_cookie(inode, file); |
| 358 | *opened |= FILE_CREATED; |
| 359 | out: |
| 360 | v9fs_put_acl(dacl, pacl); |
| 361 | dput(res); |
| 362 | return err; |
| 363 | |
| 364 | error: |
| 365 | if (fid) |
| 366 | p9_client_clunk(fid); |
| 367 | err_clunk_old_fid: |
| 368 | if (ofid) |
| 369 | p9_client_clunk(ofid); |
| 370 | goto out; |
| 371 | } |
| 372 | |
| 373 | /** |
| 374 | * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory |
| 375 | * @dir: inode that is being unlinked |
| 376 | * @dentry: dentry that is being unlinked |
| 377 | * @omode: mode for new directory |
| 378 | * |
| 379 | */ |
| 380 | |
| 381 | static int v9fs_vfs_mkdir_dotl(struct inode *dir, |
| 382 | struct dentry *dentry, umode_t omode) |
| 383 | { |
| 384 | int err; |
| 385 | struct v9fs_session_info *v9ses; |
| 386 | struct p9_fid *fid = NULL, *dfid = NULL; |
| 387 | kgid_t gid; |
| 388 | char *name; |
| 389 | umode_t mode; |
| 390 | struct inode *inode; |
| 391 | struct p9_qid qid; |
| 392 | struct posix_acl *dacl = NULL, *pacl = NULL; |
| 393 | |
| 394 | p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry); |
| 395 | err = 0; |
| 396 | v9ses = v9fs_inode2v9ses(dir); |
| 397 | |
| 398 | omode |= S_IFDIR; |
| 399 | if (dir->i_mode & S_ISGID) |
| 400 | omode |= S_ISGID; |
| 401 | |
| 402 | dfid = v9fs_parent_fid(dentry); |
| 403 | if (IS_ERR(dfid)) { |
| 404 | err = PTR_ERR(dfid); |
| 405 | p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); |
| 406 | dfid = NULL; |
| 407 | goto error; |
| 408 | } |
| 409 | |
| 410 | gid = v9fs_get_fsgid_for_create(dir); |
| 411 | mode = omode; |
| 412 | /* Update mode based on ACL value */ |
| 413 | err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); |
| 414 | if (err) { |
| 415 | p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n", |
| 416 | err); |
| 417 | goto error; |
| 418 | } |
| 419 | name = (char *) dentry->d_name.name; |
| 420 | err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid); |
| 421 | if (err < 0) |
| 422 | goto error; |
| 423 | |
| 424 | fid = p9_client_walk(dfid, 1, &name, 1); |
| 425 | if (IS_ERR(fid)) { |
| 426 | err = PTR_ERR(fid); |
| 427 | p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", |
| 428 | err); |
| 429 | fid = NULL; |
| 430 | goto error; |
| 431 | } |
| 432 | |
| 433 | /* instantiate inode and assign the unopened fid to the dentry */ |
| 434 | if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { |
| 435 | inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); |
| 436 | if (IS_ERR(inode)) { |
| 437 | err = PTR_ERR(inode); |
| 438 | p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", |
| 439 | err); |
| 440 | goto error; |
| 441 | } |
| 442 | v9fs_fid_add(dentry, fid); |
| 443 | v9fs_set_create_acl(inode, fid, dacl, pacl); |
| 444 | d_instantiate(dentry, inode); |
| 445 | fid = NULL; |
| 446 | err = 0; |
| 447 | } else { |
| 448 | /* |
| 449 | * Not in cached mode. No need to populate |
| 450 | * inode with stat. We need to get an inode |
| 451 | * so that we can set the acl with dentry |
| 452 | */ |
| 453 | inode = v9fs_get_inode(dir->i_sb, mode, 0); |
| 454 | if (IS_ERR(inode)) { |
| 455 | err = PTR_ERR(inode); |
| 456 | goto error; |
| 457 | } |
| 458 | v9fs_set_create_acl(inode, fid, dacl, pacl); |
| 459 | d_instantiate(dentry, inode); |
| 460 | } |
| 461 | inc_nlink(dir); |
| 462 | v9fs_invalidate_inode_attr(dir); |
| 463 | error: |
| 464 | if (fid) |
| 465 | p9_client_clunk(fid); |
| 466 | v9fs_put_acl(dacl, pacl); |
| 467 | return err; |
| 468 | } |
| 469 | |
| 470 | static int |
| 471 | v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry, |
| 472 | struct kstat *stat) |
| 473 | { |
| 474 | struct v9fs_session_info *v9ses; |
| 475 | struct p9_fid *fid; |
| 476 | struct p9_stat_dotl *st; |
| 477 | |
| 478 | p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry); |
| 479 | v9ses = v9fs_dentry2v9ses(dentry); |
| 480 | if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { |
| 481 | generic_fillattr(d_inode(dentry), stat); |
| 482 | return 0; |
| 483 | } |
| 484 | fid = v9fs_fid_lookup(dentry); |
| 485 | if (IS_ERR(fid)) |
| 486 | return PTR_ERR(fid); |
| 487 | |
| 488 | /* Ask for all the fields in stat structure. Server will return |
| 489 | * whatever it supports |
| 490 | */ |
| 491 | |
| 492 | st = p9_client_getattr_dotl(fid, P9_STATS_ALL); |
| 493 | if (IS_ERR(st)) |
| 494 | return PTR_ERR(st); |
| 495 | |
| 496 | v9fs_stat2inode_dotl(st, d_inode(dentry)); |
| 497 | generic_fillattr(d_inode(dentry), stat); |
| 498 | /* Change block size to what the server returned */ |
| 499 | stat->blksize = st->st_blksize; |
| 500 | |
| 501 | kfree(st); |
| 502 | return 0; |
| 503 | } |
| 504 | |
| 505 | /* |
| 506 | * Attribute flags. |
| 507 | */ |
| 508 | #define P9_ATTR_MODE (1 << 0) |
| 509 | #define P9_ATTR_UID (1 << 1) |
| 510 | #define P9_ATTR_GID (1 << 2) |
| 511 | #define P9_ATTR_SIZE (1 << 3) |
| 512 | #define P9_ATTR_ATIME (1 << 4) |
| 513 | #define P9_ATTR_MTIME (1 << 5) |
| 514 | #define P9_ATTR_CTIME (1 << 6) |
| 515 | #define P9_ATTR_ATIME_SET (1 << 7) |
| 516 | #define P9_ATTR_MTIME_SET (1 << 8) |
| 517 | |
| 518 | struct dotl_iattr_map { |
| 519 | int iattr_valid; |
| 520 | int p9_iattr_valid; |
| 521 | }; |
| 522 | |
| 523 | static int v9fs_mapped_iattr_valid(int iattr_valid) |
| 524 | { |
| 525 | int i; |
| 526 | int p9_iattr_valid = 0; |
| 527 | struct dotl_iattr_map dotl_iattr_map[] = { |
| 528 | { ATTR_MODE, P9_ATTR_MODE }, |
| 529 | { ATTR_UID, P9_ATTR_UID }, |
| 530 | { ATTR_GID, P9_ATTR_GID }, |
| 531 | { ATTR_SIZE, P9_ATTR_SIZE }, |
| 532 | { ATTR_ATIME, P9_ATTR_ATIME }, |
| 533 | { ATTR_MTIME, P9_ATTR_MTIME }, |
| 534 | { ATTR_CTIME, P9_ATTR_CTIME }, |
| 535 | { ATTR_ATIME_SET, P9_ATTR_ATIME_SET }, |
| 536 | { ATTR_MTIME_SET, P9_ATTR_MTIME_SET }, |
| 537 | }; |
| 538 | for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) { |
| 539 | if (iattr_valid & dotl_iattr_map[i].iattr_valid) |
| 540 | p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid; |
| 541 | } |
| 542 | return p9_iattr_valid; |
| 543 | } |
| 544 | |
| 545 | /** |
| 546 | * v9fs_vfs_setattr_dotl - set file metadata |
| 547 | * @dentry: file whose metadata to set |
| 548 | * @iattr: metadata assignment structure |
| 549 | * |
| 550 | */ |
| 551 | |
| 552 | int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr) |
| 553 | { |
| 554 | int retval; |
| 555 | struct p9_fid *fid; |
| 556 | struct p9_iattr_dotl p9attr; |
| 557 | struct inode *inode = d_inode(dentry); |
| 558 | |
| 559 | p9_debug(P9_DEBUG_VFS, "\n"); |
| 560 | |
| 561 | retval = inode_change_ok(inode, iattr); |
| 562 | if (retval) |
| 563 | return retval; |
| 564 | |
| 565 | p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid); |
| 566 | p9attr.mode = iattr->ia_mode; |
| 567 | p9attr.uid = iattr->ia_uid; |
| 568 | p9attr.gid = iattr->ia_gid; |
| 569 | p9attr.size = iattr->ia_size; |
| 570 | p9attr.atime_sec = iattr->ia_atime.tv_sec; |
| 571 | p9attr.atime_nsec = iattr->ia_atime.tv_nsec; |
| 572 | p9attr.mtime_sec = iattr->ia_mtime.tv_sec; |
| 573 | p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec; |
| 574 | |
| 575 | fid = v9fs_fid_lookup(dentry); |
| 576 | if (IS_ERR(fid)) |
| 577 | return PTR_ERR(fid); |
| 578 | |
| 579 | /* Write all dirty data */ |
| 580 | if (S_ISREG(inode->i_mode)) |
| 581 | filemap_write_and_wait(inode->i_mapping); |
| 582 | |
| 583 | retval = p9_client_setattr(fid, &p9attr); |
| 584 | if (retval < 0) |
| 585 | return retval; |
| 586 | |
| 587 | if ((iattr->ia_valid & ATTR_SIZE) && |
| 588 | iattr->ia_size != i_size_read(inode)) |
| 589 | truncate_setsize(inode, iattr->ia_size); |
| 590 | |
| 591 | v9fs_invalidate_inode_attr(inode); |
| 592 | setattr_copy(inode, iattr); |
| 593 | mark_inode_dirty(inode); |
| 594 | if (iattr->ia_valid & ATTR_MODE) { |
| 595 | /* We also want to update ACL when we update mode bits */ |
| 596 | retval = v9fs_acl_chmod(inode, fid); |
| 597 | if (retval < 0) |
| 598 | return retval; |
| 599 | } |
| 600 | return 0; |
| 601 | } |
| 602 | |
| 603 | /** |
| 604 | * v9fs_stat2inode_dotl - populate an inode structure with stat info |
| 605 | * @stat: stat structure |
| 606 | * @inode: inode to populate |
| 607 | * |
| 608 | */ |
| 609 | |
| 610 | void |
| 611 | v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode) |
| 612 | { |
| 613 | umode_t mode; |
| 614 | struct v9fs_inode *v9inode = V9FS_I(inode); |
| 615 | |
| 616 | if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) { |
| 617 | inode->i_atime.tv_sec = stat->st_atime_sec; |
| 618 | inode->i_atime.tv_nsec = stat->st_atime_nsec; |
| 619 | inode->i_mtime.tv_sec = stat->st_mtime_sec; |
| 620 | inode->i_mtime.tv_nsec = stat->st_mtime_nsec; |
| 621 | inode->i_ctime.tv_sec = stat->st_ctime_sec; |
| 622 | inode->i_ctime.tv_nsec = stat->st_ctime_nsec; |
| 623 | inode->i_uid = stat->st_uid; |
| 624 | inode->i_gid = stat->st_gid; |
| 625 | set_nlink(inode, stat->st_nlink); |
| 626 | |
| 627 | mode = stat->st_mode & S_IALLUGO; |
| 628 | mode |= inode->i_mode & ~S_IALLUGO; |
| 629 | inode->i_mode = mode; |
| 630 | |
| 631 | i_size_write(inode, stat->st_size); |
| 632 | inode->i_blocks = stat->st_blocks; |
| 633 | } else { |
| 634 | if (stat->st_result_mask & P9_STATS_ATIME) { |
| 635 | inode->i_atime.tv_sec = stat->st_atime_sec; |
| 636 | inode->i_atime.tv_nsec = stat->st_atime_nsec; |
| 637 | } |
| 638 | if (stat->st_result_mask & P9_STATS_MTIME) { |
| 639 | inode->i_mtime.tv_sec = stat->st_mtime_sec; |
| 640 | inode->i_mtime.tv_nsec = stat->st_mtime_nsec; |
| 641 | } |
| 642 | if (stat->st_result_mask & P9_STATS_CTIME) { |
| 643 | inode->i_ctime.tv_sec = stat->st_ctime_sec; |
| 644 | inode->i_ctime.tv_nsec = stat->st_ctime_nsec; |
| 645 | } |
| 646 | if (stat->st_result_mask & P9_STATS_UID) |
| 647 | inode->i_uid = stat->st_uid; |
| 648 | if (stat->st_result_mask & P9_STATS_GID) |
| 649 | inode->i_gid = stat->st_gid; |
| 650 | if (stat->st_result_mask & P9_STATS_NLINK) |
| 651 | set_nlink(inode, stat->st_nlink); |
| 652 | if (stat->st_result_mask & P9_STATS_MODE) { |
| 653 | inode->i_mode = stat->st_mode; |
| 654 | if ((S_ISBLK(inode->i_mode)) || |
| 655 | (S_ISCHR(inode->i_mode))) |
| 656 | init_special_inode(inode, inode->i_mode, |
| 657 | inode->i_rdev); |
| 658 | } |
| 659 | if (stat->st_result_mask & P9_STATS_RDEV) |
| 660 | inode->i_rdev = new_decode_dev(stat->st_rdev); |
| 661 | if (stat->st_result_mask & P9_STATS_SIZE) |
| 662 | i_size_write(inode, stat->st_size); |
| 663 | if (stat->st_result_mask & P9_STATS_BLOCKS) |
| 664 | inode->i_blocks = stat->st_blocks; |
| 665 | } |
| 666 | if (stat->st_result_mask & P9_STATS_GEN) |
| 667 | inode->i_generation = stat->st_gen; |
| 668 | |
| 669 | /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION |
| 670 | * because the inode structure does not have fields for them. |
| 671 | */ |
| 672 | v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR; |
| 673 | } |
| 674 | |
| 675 | static int |
| 676 | v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry, |
| 677 | const char *symname) |
| 678 | { |
| 679 | int err; |
| 680 | kgid_t gid; |
| 681 | char *name; |
| 682 | struct p9_qid qid; |
| 683 | struct inode *inode; |
| 684 | struct p9_fid *dfid; |
| 685 | struct p9_fid *fid = NULL; |
| 686 | struct v9fs_session_info *v9ses; |
| 687 | |
| 688 | name = (char *) dentry->d_name.name; |
| 689 | p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname); |
| 690 | v9ses = v9fs_inode2v9ses(dir); |
| 691 | |
| 692 | dfid = v9fs_parent_fid(dentry); |
| 693 | if (IS_ERR(dfid)) { |
| 694 | err = PTR_ERR(dfid); |
| 695 | p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); |
| 696 | return err; |
| 697 | } |
| 698 | |
| 699 | gid = v9fs_get_fsgid_for_create(dir); |
| 700 | |
| 701 | /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */ |
| 702 | err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid); |
| 703 | |
| 704 | if (err < 0) { |
| 705 | p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err); |
| 706 | goto error; |
| 707 | } |
| 708 | |
| 709 | v9fs_invalidate_inode_attr(dir); |
| 710 | if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { |
| 711 | /* Now walk from the parent so we can get an unopened fid. */ |
| 712 | fid = p9_client_walk(dfid, 1, &name, 1); |
| 713 | if (IS_ERR(fid)) { |
| 714 | err = PTR_ERR(fid); |
| 715 | p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", |
| 716 | err); |
| 717 | fid = NULL; |
| 718 | goto error; |
| 719 | } |
| 720 | |
| 721 | /* instantiate inode and assign the unopened fid to dentry */ |
| 722 | inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); |
| 723 | if (IS_ERR(inode)) { |
| 724 | err = PTR_ERR(inode); |
| 725 | p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", |
| 726 | err); |
| 727 | goto error; |
| 728 | } |
| 729 | v9fs_fid_add(dentry, fid); |
| 730 | d_instantiate(dentry, inode); |
| 731 | fid = NULL; |
| 732 | err = 0; |
| 733 | } else { |
| 734 | /* Not in cached mode. No need to populate inode with stat */ |
| 735 | inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0); |
| 736 | if (IS_ERR(inode)) { |
| 737 | err = PTR_ERR(inode); |
| 738 | goto error; |
| 739 | } |
| 740 | d_instantiate(dentry, inode); |
| 741 | } |
| 742 | |
| 743 | error: |
| 744 | if (fid) |
| 745 | p9_client_clunk(fid); |
| 746 | |
| 747 | return err; |
| 748 | } |
| 749 | |
| 750 | /** |
| 751 | * v9fs_vfs_link_dotl - create a hardlink for dotl |
| 752 | * @old_dentry: dentry for file to link to |
| 753 | * @dir: inode destination for new link |
| 754 | * @dentry: dentry for link |
| 755 | * |
| 756 | */ |
| 757 | |
| 758 | static int |
| 759 | v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir, |
| 760 | struct dentry *dentry) |
| 761 | { |
| 762 | int err; |
| 763 | struct p9_fid *dfid, *oldfid; |
| 764 | struct v9fs_session_info *v9ses; |
| 765 | |
| 766 | p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %pd, new_name: %pd\n", |
| 767 | dir->i_ino, old_dentry, dentry); |
| 768 | |
| 769 | v9ses = v9fs_inode2v9ses(dir); |
| 770 | dfid = v9fs_parent_fid(dentry); |
| 771 | if (IS_ERR(dfid)) |
| 772 | return PTR_ERR(dfid); |
| 773 | |
| 774 | oldfid = v9fs_fid_lookup(old_dentry); |
| 775 | if (IS_ERR(oldfid)) |
| 776 | return PTR_ERR(oldfid); |
| 777 | |
| 778 | err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name); |
| 779 | |
| 780 | if (err < 0) { |
| 781 | p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err); |
| 782 | return err; |
| 783 | } |
| 784 | |
| 785 | v9fs_invalidate_inode_attr(dir); |
| 786 | if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { |
| 787 | /* Get the latest stat info from server. */ |
| 788 | struct p9_fid *fid; |
| 789 | fid = v9fs_fid_lookup(old_dentry); |
| 790 | if (IS_ERR(fid)) |
| 791 | return PTR_ERR(fid); |
| 792 | |
| 793 | v9fs_refresh_inode_dotl(fid, d_inode(old_dentry)); |
| 794 | } |
| 795 | ihold(d_inode(old_dentry)); |
| 796 | d_instantiate(dentry, d_inode(old_dentry)); |
| 797 | |
| 798 | return err; |
| 799 | } |
| 800 | |
| 801 | /** |
| 802 | * v9fs_vfs_mknod_dotl - create a special file |
| 803 | * @dir: inode destination for new link |
| 804 | * @dentry: dentry for file |
| 805 | * @omode: mode for creation |
| 806 | * @rdev: device associated with special file |
| 807 | * |
| 808 | */ |
| 809 | static int |
| 810 | v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode, |
| 811 | dev_t rdev) |
| 812 | { |
| 813 | int err; |
| 814 | kgid_t gid; |
| 815 | char *name; |
| 816 | umode_t mode; |
| 817 | struct v9fs_session_info *v9ses; |
| 818 | struct p9_fid *fid = NULL, *dfid = NULL; |
| 819 | struct inode *inode; |
| 820 | struct p9_qid qid; |
| 821 | struct posix_acl *dacl = NULL, *pacl = NULL; |
| 822 | |
| 823 | p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %hx MAJOR: %u MINOR: %u\n", |
| 824 | dir->i_ino, dentry, omode, |
| 825 | MAJOR(rdev), MINOR(rdev)); |
| 826 | |
| 827 | v9ses = v9fs_inode2v9ses(dir); |
| 828 | dfid = v9fs_parent_fid(dentry); |
| 829 | if (IS_ERR(dfid)) { |
| 830 | err = PTR_ERR(dfid); |
| 831 | p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); |
| 832 | dfid = NULL; |
| 833 | goto error; |
| 834 | } |
| 835 | |
| 836 | gid = v9fs_get_fsgid_for_create(dir); |
| 837 | mode = omode; |
| 838 | /* Update mode based on ACL value */ |
| 839 | err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); |
| 840 | if (err) { |
| 841 | p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n", |
| 842 | err); |
| 843 | goto error; |
| 844 | } |
| 845 | name = (char *) dentry->d_name.name; |
| 846 | |
| 847 | err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid); |
| 848 | if (err < 0) |
| 849 | goto error; |
| 850 | |
| 851 | v9fs_invalidate_inode_attr(dir); |
| 852 | fid = p9_client_walk(dfid, 1, &name, 1); |
| 853 | if (IS_ERR(fid)) { |
| 854 | err = PTR_ERR(fid); |
| 855 | p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", |
| 856 | err); |
| 857 | fid = NULL; |
| 858 | goto error; |
| 859 | } |
| 860 | |
| 861 | /* instantiate inode and assign the unopened fid to the dentry */ |
| 862 | if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { |
| 863 | inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); |
| 864 | if (IS_ERR(inode)) { |
| 865 | err = PTR_ERR(inode); |
| 866 | p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", |
| 867 | err); |
| 868 | goto error; |
| 869 | } |
| 870 | v9fs_set_create_acl(inode, fid, dacl, pacl); |
| 871 | v9fs_fid_add(dentry, fid); |
| 872 | d_instantiate(dentry, inode); |
| 873 | fid = NULL; |
| 874 | err = 0; |
| 875 | } else { |
| 876 | /* |
| 877 | * Not in cached mode. No need to populate inode with stat. |
| 878 | * socket syscall returns a fd, so we need instantiate |
| 879 | */ |
| 880 | inode = v9fs_get_inode(dir->i_sb, mode, rdev); |
| 881 | if (IS_ERR(inode)) { |
| 882 | err = PTR_ERR(inode); |
| 883 | goto error; |
| 884 | } |
| 885 | v9fs_set_create_acl(inode, fid, dacl, pacl); |
| 886 | d_instantiate(dentry, inode); |
| 887 | } |
| 888 | error: |
| 889 | if (fid) |
| 890 | p9_client_clunk(fid); |
| 891 | v9fs_put_acl(dacl, pacl); |
| 892 | return err; |
| 893 | } |
| 894 | |
| 895 | /** |
| 896 | * v9fs_vfs_get_link_dotl - follow a symlink path |
| 897 | * @dentry: dentry for symlink |
| 898 | * @inode: inode for symlink |
| 899 | * @done: destructor for return value |
| 900 | */ |
| 901 | |
| 902 | static const char * |
| 903 | v9fs_vfs_get_link_dotl(struct dentry *dentry, |
| 904 | struct inode *inode, |
| 905 | struct delayed_call *done) |
| 906 | { |
| 907 | struct p9_fid *fid; |
| 908 | char *target; |
| 909 | int retval; |
| 910 | |
| 911 | if (!dentry) |
| 912 | return ERR_PTR(-ECHILD); |
| 913 | |
| 914 | p9_debug(P9_DEBUG_VFS, "%pd\n", dentry); |
| 915 | |
| 916 | fid = v9fs_fid_lookup(dentry); |
| 917 | if (IS_ERR(fid)) |
| 918 | return ERR_CAST(fid); |
| 919 | retval = p9_client_readlink(fid, &target); |
| 920 | if (retval) |
| 921 | return ERR_PTR(retval); |
| 922 | set_delayed_call(done, kfree_link, target); |
| 923 | return target; |
| 924 | } |
| 925 | |
| 926 | int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode) |
| 927 | { |
| 928 | loff_t i_size; |
| 929 | struct p9_stat_dotl *st; |
| 930 | struct v9fs_session_info *v9ses; |
| 931 | |
| 932 | v9ses = v9fs_inode2v9ses(inode); |
| 933 | st = p9_client_getattr_dotl(fid, P9_STATS_ALL); |
| 934 | if (IS_ERR(st)) |
| 935 | return PTR_ERR(st); |
| 936 | /* |
| 937 | * Don't update inode if the file type is different |
| 938 | */ |
| 939 | if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT)) |
| 940 | goto out; |
| 941 | |
| 942 | spin_lock(&inode->i_lock); |
| 943 | /* |
| 944 | * We don't want to refresh inode->i_size, |
| 945 | * because we may have cached data |
| 946 | */ |
| 947 | i_size = inode->i_size; |
| 948 | v9fs_stat2inode_dotl(st, inode); |
| 949 | if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) |
| 950 | inode->i_size = i_size; |
| 951 | spin_unlock(&inode->i_lock); |
| 952 | out: |
| 953 | kfree(st); |
| 954 | return 0; |
| 955 | } |
| 956 | |
| 957 | const struct inode_operations v9fs_dir_inode_operations_dotl = { |
| 958 | .create = v9fs_vfs_create_dotl, |
| 959 | .atomic_open = v9fs_vfs_atomic_open_dotl, |
| 960 | .lookup = v9fs_vfs_lookup, |
| 961 | .link = v9fs_vfs_link_dotl, |
| 962 | .symlink = v9fs_vfs_symlink_dotl, |
| 963 | .unlink = v9fs_vfs_unlink, |
| 964 | .mkdir = v9fs_vfs_mkdir_dotl, |
| 965 | .rmdir = v9fs_vfs_rmdir, |
| 966 | .mknod = v9fs_vfs_mknod_dotl, |
| 967 | .rename = v9fs_vfs_rename, |
| 968 | .getattr = v9fs_vfs_getattr_dotl, |
| 969 | .setattr = v9fs_vfs_setattr_dotl, |
| 970 | .setxattr = generic_setxattr, |
| 971 | .getxattr = generic_getxattr, |
| 972 | .removexattr = generic_removexattr, |
| 973 | .listxattr = v9fs_listxattr, |
| 974 | .get_acl = v9fs_iop_get_acl, |
| 975 | }; |
| 976 | |
| 977 | const struct inode_operations v9fs_file_inode_operations_dotl = { |
| 978 | .getattr = v9fs_vfs_getattr_dotl, |
| 979 | .setattr = v9fs_vfs_setattr_dotl, |
| 980 | .setxattr = generic_setxattr, |
| 981 | .getxattr = generic_getxattr, |
| 982 | .removexattr = generic_removexattr, |
| 983 | .listxattr = v9fs_listxattr, |
| 984 | .get_acl = v9fs_iop_get_acl, |
| 985 | }; |
| 986 | |
| 987 | const struct inode_operations v9fs_symlink_inode_operations_dotl = { |
| 988 | .readlink = generic_readlink, |
| 989 | .get_link = v9fs_vfs_get_link_dotl, |
| 990 | .getattr = v9fs_vfs_getattr_dotl, |
| 991 | .setattr = v9fs_vfs_setattr_dotl, |
| 992 | .setxattr = generic_setxattr, |
| 993 | .getxattr = generic_getxattr, |
| 994 | .removexattr = generic_removexattr, |
| 995 | .listxattr = v9fs_listxattr, |
| 996 | }; |