| 1 | // SPDX-License-Identifier: GPL-2.0-only |
| 2 | /* |
| 3 | * This file contains vfs inode ops for the 9P2000.L protocol. |
| 4 | * |
| 5 | * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> |
| 6 | * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> |
| 7 | */ |
| 8 | |
| 9 | #include <linux/module.h> |
| 10 | #include <linux/errno.h> |
| 11 | #include <linux/fs.h> |
| 12 | #include <linux/file.h> |
| 13 | #include <linux/pagemap.h> |
| 14 | #include <linux/stat.h> |
| 15 | #include <linux/string.h> |
| 16 | #include <linux/namei.h> |
| 17 | #include <linux/sched.h> |
| 18 | #include <linux/slab.h> |
| 19 | #include <linux/xattr.h> |
| 20 | #include <linux/posix_acl.h> |
| 21 | #include <net/9p/9p.h> |
| 22 | #include <net/9p/client.h> |
| 23 | |
| 24 | #include "v9fs.h" |
| 25 | #include "v9fs_vfs.h" |
| 26 | #include "fid.h" |
| 27 | #include "cache.h" |
| 28 | #include "xattr.h" |
| 29 | #include "acl.h" |
| 30 | |
| 31 | static int |
| 32 | v9fs_vfs_mknod_dotl(struct mnt_idmap *idmap, struct inode *dir, |
| 33 | struct dentry *dentry, umode_t omode, dev_t rdev); |
| 34 | |
| 35 | /** |
| 36 | * v9fs_get_fsgid_for_create - Helper function to get the gid for a new object |
| 37 | * @dir_inode: The directory inode |
| 38 | * |
| 39 | * Helper function to get the gid for creating a |
| 40 | * new file system object. This checks the S_ISGID to determine the owning |
| 41 | * group of the new file system object. |
| 42 | */ |
| 43 | |
| 44 | static kgid_t v9fs_get_fsgid_for_create(struct inode *dir_inode) |
| 45 | { |
| 46 | BUG_ON(dir_inode == NULL); |
| 47 | |
| 48 | if (dir_inode->i_mode & S_ISGID) { |
| 49 | /* set_gid bit is set.*/ |
| 50 | return dir_inode->i_gid; |
| 51 | } |
| 52 | return current_fsgid(); |
| 53 | } |
| 54 | |
| 55 | static int v9fs_test_inode_dotl(struct inode *inode, void *data) |
| 56 | { |
| 57 | struct v9fs_inode *v9inode = V9FS_I(inode); |
| 58 | struct p9_stat_dotl *st = (struct p9_stat_dotl *)data; |
| 59 | |
| 60 | /* don't match inode of different type */ |
| 61 | if (inode_wrong_type(inode, st->st_mode)) |
| 62 | return 0; |
| 63 | |
| 64 | if (inode->i_generation != st->st_gen) |
| 65 | return 0; |
| 66 | |
| 67 | /* compare qid details */ |
| 68 | if (memcmp(&v9inode->qid.version, |
| 69 | &st->qid.version, sizeof(v9inode->qid.version))) |
| 70 | return 0; |
| 71 | |
| 72 | if (v9inode->qid.type != st->qid.type) |
| 73 | return 0; |
| 74 | |
| 75 | if (v9inode->qid.path != st->qid.path) |
| 76 | return 0; |
| 77 | return 1; |
| 78 | } |
| 79 | |
| 80 | /* Always get a new inode */ |
| 81 | static int v9fs_test_new_inode_dotl(struct inode *inode, void *data) |
| 82 | { |
| 83 | return 0; |
| 84 | } |
| 85 | |
| 86 | static int v9fs_set_inode_dotl(struct inode *inode, void *data) |
| 87 | { |
| 88 | struct v9fs_inode *v9inode = V9FS_I(inode); |
| 89 | struct p9_stat_dotl *st = (struct p9_stat_dotl *)data; |
| 90 | |
| 91 | memcpy(&v9inode->qid, &st->qid, sizeof(st->qid)); |
| 92 | inode->i_generation = st->st_gen; |
| 93 | return 0; |
| 94 | } |
| 95 | |
| 96 | static struct inode *v9fs_qid_iget_dotl(struct super_block *sb, |
| 97 | struct p9_qid *qid, |
| 98 | struct p9_fid *fid, |
| 99 | struct p9_stat_dotl *st, |
| 100 | int new) |
| 101 | { |
| 102 | int retval; |
| 103 | struct inode *inode; |
| 104 | struct v9fs_session_info *v9ses = sb->s_fs_info; |
| 105 | int (*test)(struct inode *inode, void *data); |
| 106 | |
| 107 | if (new) |
| 108 | test = v9fs_test_new_inode_dotl; |
| 109 | else |
| 110 | test = v9fs_test_inode_dotl; |
| 111 | |
| 112 | inode = iget5_locked(sb, QID2INO(qid), test, v9fs_set_inode_dotl, st); |
| 113 | if (!inode) |
| 114 | return ERR_PTR(-ENOMEM); |
| 115 | if (!(inode->i_state & I_NEW)) |
| 116 | return inode; |
| 117 | /* |
| 118 | * initialize the inode with the stat info |
| 119 | * FIXME!! we may need support for stale inodes |
| 120 | * later. |
| 121 | */ |
| 122 | inode->i_ino = QID2INO(qid); |
| 123 | retval = v9fs_init_inode(v9ses, inode, |
| 124 | st->st_mode, new_decode_dev(st->st_rdev)); |
| 125 | if (retval) |
| 126 | goto error; |
| 127 | |
| 128 | v9fs_stat2inode_dotl(st, inode, 0); |
| 129 | v9fs_set_netfs_context(inode); |
| 130 | v9fs_cache_inode_get_cookie(inode); |
| 131 | retval = v9fs_get_acl(inode, fid); |
| 132 | if (retval) |
| 133 | goto error; |
| 134 | |
| 135 | unlock_new_inode(inode); |
| 136 | return inode; |
| 137 | error: |
| 138 | iget_failed(inode); |
| 139 | return ERR_PTR(retval); |
| 140 | |
| 141 | } |
| 142 | |
| 143 | struct inode * |
| 144 | v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid, |
| 145 | struct super_block *sb, int new) |
| 146 | { |
| 147 | struct p9_stat_dotl *st; |
| 148 | struct inode *inode = NULL; |
| 149 | |
| 150 | st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN); |
| 151 | if (IS_ERR(st)) |
| 152 | return ERR_CAST(st); |
| 153 | |
| 154 | inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st, new); |
| 155 | kfree(st); |
| 156 | return inode; |
| 157 | } |
| 158 | |
| 159 | struct dotl_openflag_map { |
| 160 | int open_flag; |
| 161 | int dotl_flag; |
| 162 | }; |
| 163 | |
| 164 | static int v9fs_mapped_dotl_flags(int flags) |
| 165 | { |
| 166 | int i; |
| 167 | int rflags = 0; |
| 168 | struct dotl_openflag_map dotl_oflag_map[] = { |
| 169 | { O_CREAT, P9_DOTL_CREATE }, |
| 170 | { O_EXCL, P9_DOTL_EXCL }, |
| 171 | { O_NOCTTY, P9_DOTL_NOCTTY }, |
| 172 | { O_APPEND, P9_DOTL_APPEND }, |
| 173 | { O_NONBLOCK, P9_DOTL_NONBLOCK }, |
| 174 | { O_DSYNC, P9_DOTL_DSYNC }, |
| 175 | { FASYNC, P9_DOTL_FASYNC }, |
| 176 | { O_DIRECT, P9_DOTL_DIRECT }, |
| 177 | { O_LARGEFILE, P9_DOTL_LARGEFILE }, |
| 178 | { O_DIRECTORY, P9_DOTL_DIRECTORY }, |
| 179 | { O_NOFOLLOW, P9_DOTL_NOFOLLOW }, |
| 180 | { O_NOATIME, P9_DOTL_NOATIME }, |
| 181 | { O_CLOEXEC, P9_DOTL_CLOEXEC }, |
| 182 | { O_SYNC, P9_DOTL_SYNC}, |
| 183 | }; |
| 184 | for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) { |
| 185 | if (flags & dotl_oflag_map[i].open_flag) |
| 186 | rflags |= dotl_oflag_map[i].dotl_flag; |
| 187 | } |
| 188 | return rflags; |
| 189 | } |
| 190 | |
| 191 | /** |
| 192 | * v9fs_open_to_dotl_flags- convert Linux specific open flags to |
| 193 | * plan 9 open flag. |
| 194 | * @flags: flags to convert |
| 195 | */ |
| 196 | int v9fs_open_to_dotl_flags(int flags) |
| 197 | { |
| 198 | int rflags = 0; |
| 199 | |
| 200 | /* |
| 201 | * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY |
| 202 | * and P9_DOTL_NOACCESS |
| 203 | */ |
| 204 | rflags |= flags & O_ACCMODE; |
| 205 | rflags |= v9fs_mapped_dotl_flags(flags); |
| 206 | |
| 207 | return rflags; |
| 208 | } |
| 209 | |
| 210 | /** |
| 211 | * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol. |
| 212 | * @idmap: The user namespace of the mount |
| 213 | * @dir: directory inode that is being created |
| 214 | * @dentry: dentry that is being deleted |
| 215 | * @omode: create permissions |
| 216 | * @excl: True if the file must not yet exist |
| 217 | * |
| 218 | */ |
| 219 | static int |
| 220 | v9fs_vfs_create_dotl(struct mnt_idmap *idmap, struct inode *dir, |
| 221 | struct dentry *dentry, umode_t omode, bool excl) |
| 222 | { |
| 223 | return v9fs_vfs_mknod_dotl(idmap, dir, dentry, omode, 0); |
| 224 | } |
| 225 | |
| 226 | static int |
| 227 | v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry, |
| 228 | struct file *file, unsigned int flags, umode_t omode) |
| 229 | { |
| 230 | int err = 0; |
| 231 | kgid_t gid; |
| 232 | umode_t mode; |
| 233 | int p9_omode = v9fs_open_to_dotl_flags(flags); |
| 234 | const unsigned char *name = NULL; |
| 235 | struct p9_qid qid; |
| 236 | struct inode *inode; |
| 237 | struct p9_fid *fid = NULL; |
| 238 | struct p9_fid *dfid = NULL, *ofid = NULL; |
| 239 | struct v9fs_session_info *v9ses; |
| 240 | struct posix_acl *pacl = NULL, *dacl = NULL; |
| 241 | struct dentry *res = NULL; |
| 242 | |
| 243 | if (d_in_lookup(dentry)) { |
| 244 | res = v9fs_vfs_lookup(dir, dentry, 0); |
| 245 | if (IS_ERR(res)) |
| 246 | return PTR_ERR(res); |
| 247 | |
| 248 | if (res) |
| 249 | dentry = res; |
| 250 | } |
| 251 | |
| 252 | /* Only creates */ |
| 253 | if (!(flags & O_CREAT) || d_really_is_positive(dentry)) |
| 254 | return finish_no_open(file, res); |
| 255 | |
| 256 | v9ses = v9fs_inode2v9ses(dir); |
| 257 | |
| 258 | name = dentry->d_name.name; |
| 259 | p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%x\n", |
| 260 | name, flags, omode); |
| 261 | |
| 262 | dfid = v9fs_parent_fid(dentry); |
| 263 | if (IS_ERR(dfid)) { |
| 264 | err = PTR_ERR(dfid); |
| 265 | p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); |
| 266 | goto out; |
| 267 | } |
| 268 | |
| 269 | /* clone a fid to use for creation */ |
| 270 | ofid = clone_fid(dfid); |
| 271 | if (IS_ERR(ofid)) { |
| 272 | err = PTR_ERR(ofid); |
| 273 | p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); |
| 274 | goto out; |
| 275 | } |
| 276 | |
| 277 | gid = v9fs_get_fsgid_for_create(dir); |
| 278 | |
| 279 | mode = omode; |
| 280 | /* Update mode based on ACL value */ |
| 281 | err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); |
| 282 | if (err) { |
| 283 | p9_debug(P9_DEBUG_VFS, "Failed to get acl values in create %d\n", |
| 284 | err); |
| 285 | goto out; |
| 286 | } |
| 287 | |
| 288 | if ((v9ses->cache & CACHE_WRITEBACK) && (p9_omode & P9_OWRITE)) { |
| 289 | p9_omode = (p9_omode & ~P9_OWRITE) | P9_ORDWR; |
| 290 | p9_debug(P9_DEBUG_CACHE, |
| 291 | "write-only file with writeback enabled, creating w/ O_RDWR\n"); |
| 292 | } |
| 293 | err = p9_client_create_dotl(ofid, name, p9_omode, mode, gid, &qid); |
| 294 | if (err < 0) { |
| 295 | p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in create %d\n", |
| 296 | err); |
| 297 | goto out; |
| 298 | } |
| 299 | v9fs_invalidate_inode_attr(dir); |
| 300 | |
| 301 | /* instantiate inode and assign the unopened fid to the dentry */ |
| 302 | fid = p9_client_walk(dfid, 1, &name, 1); |
| 303 | if (IS_ERR(fid)) { |
| 304 | err = PTR_ERR(fid); |
| 305 | p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); |
| 306 | goto out; |
| 307 | } |
| 308 | inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); |
| 309 | if (IS_ERR(inode)) { |
| 310 | err = PTR_ERR(inode); |
| 311 | p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err); |
| 312 | goto out; |
| 313 | } |
| 314 | /* Now set the ACL based on the default value */ |
| 315 | v9fs_set_create_acl(inode, fid, dacl, pacl); |
| 316 | |
| 317 | v9fs_fid_add(dentry, &fid); |
| 318 | d_instantiate(dentry, inode); |
| 319 | |
| 320 | /* Since we are opening a file, assign the open fid to the file */ |
| 321 | err = finish_open(file, dentry, generic_file_open); |
| 322 | if (err) |
| 323 | goto out; |
| 324 | file->private_data = ofid; |
| 325 | #ifdef CONFIG_9P_FSCACHE |
| 326 | if (v9ses->cache & CACHE_FSCACHE) { |
| 327 | struct v9fs_inode *v9inode = V9FS_I(inode); |
| 328 | fscache_use_cookie(v9fs_inode_cookie(v9inode), |
| 329 | file->f_mode & FMODE_WRITE); |
| 330 | } |
| 331 | #endif |
| 332 | v9fs_fid_add_modes(ofid, v9ses->flags, v9ses->cache, flags); |
| 333 | v9fs_open_fid_add(inode, &ofid); |
| 334 | file->f_mode |= FMODE_CREATED; |
| 335 | out: |
| 336 | p9_fid_put(dfid); |
| 337 | p9_fid_put(ofid); |
| 338 | p9_fid_put(fid); |
| 339 | v9fs_put_acl(dacl, pacl); |
| 340 | dput(res); |
| 341 | return err; |
| 342 | } |
| 343 | |
| 344 | /** |
| 345 | * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory |
| 346 | * @idmap: The idmap of the mount |
| 347 | * @dir: inode that is being unlinked |
| 348 | * @dentry: dentry that is being unlinked |
| 349 | * @omode: mode for new directory |
| 350 | * |
| 351 | */ |
| 352 | |
| 353 | static struct dentry *v9fs_vfs_mkdir_dotl(struct mnt_idmap *idmap, |
| 354 | struct inode *dir, struct dentry *dentry, |
| 355 | umode_t omode) |
| 356 | { |
| 357 | int err; |
| 358 | struct v9fs_session_info *v9ses; |
| 359 | struct p9_fid *fid = NULL, *dfid = NULL; |
| 360 | kgid_t gid; |
| 361 | const unsigned char *name; |
| 362 | umode_t mode; |
| 363 | struct inode *inode; |
| 364 | struct p9_qid qid; |
| 365 | struct posix_acl *dacl = NULL, *pacl = NULL; |
| 366 | |
| 367 | p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry); |
| 368 | v9ses = v9fs_inode2v9ses(dir); |
| 369 | |
| 370 | omode |= S_IFDIR; |
| 371 | if (dir->i_mode & S_ISGID) |
| 372 | omode |= S_ISGID; |
| 373 | |
| 374 | dfid = v9fs_parent_fid(dentry); |
| 375 | if (IS_ERR(dfid)) { |
| 376 | err = PTR_ERR(dfid); |
| 377 | p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); |
| 378 | goto error; |
| 379 | } |
| 380 | |
| 381 | gid = v9fs_get_fsgid_for_create(dir); |
| 382 | mode = omode; |
| 383 | /* Update mode based on ACL value */ |
| 384 | err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); |
| 385 | if (err) { |
| 386 | p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n", |
| 387 | err); |
| 388 | goto error; |
| 389 | } |
| 390 | name = dentry->d_name.name; |
| 391 | err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid); |
| 392 | if (err < 0) |
| 393 | goto error; |
| 394 | fid = p9_client_walk(dfid, 1, &name, 1); |
| 395 | if (IS_ERR(fid)) { |
| 396 | err = PTR_ERR(fid); |
| 397 | p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", |
| 398 | err); |
| 399 | goto error; |
| 400 | } |
| 401 | |
| 402 | /* instantiate inode and assign the unopened fid to the dentry */ |
| 403 | inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); |
| 404 | if (IS_ERR(inode)) { |
| 405 | err = PTR_ERR(inode); |
| 406 | p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", |
| 407 | err); |
| 408 | goto error; |
| 409 | } |
| 410 | v9fs_set_create_acl(inode, fid, dacl, pacl); |
| 411 | v9fs_fid_add(dentry, &fid); |
| 412 | d_instantiate(dentry, inode); |
| 413 | err = 0; |
| 414 | inc_nlink(dir); |
| 415 | v9fs_invalidate_inode_attr(dir); |
| 416 | error: |
| 417 | p9_fid_put(fid); |
| 418 | v9fs_put_acl(dacl, pacl); |
| 419 | p9_fid_put(dfid); |
| 420 | return ERR_PTR(err); |
| 421 | } |
| 422 | |
| 423 | static int |
| 424 | v9fs_vfs_getattr_dotl(struct mnt_idmap *idmap, |
| 425 | const struct path *path, struct kstat *stat, |
| 426 | u32 request_mask, unsigned int flags) |
| 427 | { |
| 428 | struct dentry *dentry = path->dentry; |
| 429 | struct v9fs_session_info *v9ses; |
| 430 | struct p9_fid *fid; |
| 431 | struct inode *inode = d_inode(dentry); |
| 432 | struct p9_stat_dotl *st; |
| 433 | |
| 434 | p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry); |
| 435 | v9ses = v9fs_dentry2v9ses(dentry); |
| 436 | if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) { |
| 437 | generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat); |
| 438 | return 0; |
| 439 | } else if (v9ses->cache) { |
| 440 | if (S_ISREG(inode->i_mode)) { |
| 441 | int retval = filemap_fdatawrite(inode->i_mapping); |
| 442 | |
| 443 | if (retval) |
| 444 | p9_debug(P9_DEBUG_ERROR, |
| 445 | "flushing writeback during getattr returned %d\n", retval); |
| 446 | } |
| 447 | } |
| 448 | fid = v9fs_fid_lookup(dentry); |
| 449 | if (IS_ERR(fid)) |
| 450 | return PTR_ERR(fid); |
| 451 | |
| 452 | /* Ask for all the fields in stat structure. Server will return |
| 453 | * whatever it supports |
| 454 | */ |
| 455 | |
| 456 | st = p9_client_getattr_dotl(fid, P9_STATS_ALL); |
| 457 | p9_fid_put(fid); |
| 458 | if (IS_ERR(st)) |
| 459 | return PTR_ERR(st); |
| 460 | |
| 461 | v9fs_stat2inode_dotl(st, d_inode(dentry), 0); |
| 462 | generic_fillattr(&nop_mnt_idmap, request_mask, d_inode(dentry), stat); |
| 463 | /* Change block size to what the server returned */ |
| 464 | stat->blksize = st->st_blksize; |
| 465 | |
| 466 | kfree(st); |
| 467 | return 0; |
| 468 | } |
| 469 | |
| 470 | /* |
| 471 | * Attribute flags. |
| 472 | */ |
| 473 | #define P9_ATTR_MODE (1 << 0) |
| 474 | #define P9_ATTR_UID (1 << 1) |
| 475 | #define P9_ATTR_GID (1 << 2) |
| 476 | #define P9_ATTR_SIZE (1 << 3) |
| 477 | #define P9_ATTR_ATIME (1 << 4) |
| 478 | #define P9_ATTR_MTIME (1 << 5) |
| 479 | #define P9_ATTR_CTIME (1 << 6) |
| 480 | #define P9_ATTR_ATIME_SET (1 << 7) |
| 481 | #define P9_ATTR_MTIME_SET (1 << 8) |
| 482 | |
| 483 | struct dotl_iattr_map { |
| 484 | int iattr_valid; |
| 485 | int p9_iattr_valid; |
| 486 | }; |
| 487 | |
| 488 | static int v9fs_mapped_iattr_valid(int iattr_valid) |
| 489 | { |
| 490 | int i; |
| 491 | int p9_iattr_valid = 0; |
| 492 | struct dotl_iattr_map dotl_iattr_map[] = { |
| 493 | { ATTR_MODE, P9_ATTR_MODE }, |
| 494 | { ATTR_UID, P9_ATTR_UID }, |
| 495 | { ATTR_GID, P9_ATTR_GID }, |
| 496 | { ATTR_SIZE, P9_ATTR_SIZE }, |
| 497 | { ATTR_ATIME, P9_ATTR_ATIME }, |
| 498 | { ATTR_MTIME, P9_ATTR_MTIME }, |
| 499 | { ATTR_CTIME, P9_ATTR_CTIME }, |
| 500 | { ATTR_ATIME_SET, P9_ATTR_ATIME_SET }, |
| 501 | { ATTR_MTIME_SET, P9_ATTR_MTIME_SET }, |
| 502 | }; |
| 503 | for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) { |
| 504 | if (iattr_valid & dotl_iattr_map[i].iattr_valid) |
| 505 | p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid; |
| 506 | } |
| 507 | return p9_iattr_valid; |
| 508 | } |
| 509 | |
| 510 | /** |
| 511 | * v9fs_vfs_setattr_dotl - set file metadata |
| 512 | * @idmap: idmap of the mount |
| 513 | * @dentry: file whose metadata to set |
| 514 | * @iattr: metadata assignment structure |
| 515 | * |
| 516 | */ |
| 517 | |
| 518 | int v9fs_vfs_setattr_dotl(struct mnt_idmap *idmap, |
| 519 | struct dentry *dentry, struct iattr *iattr) |
| 520 | { |
| 521 | int retval, use_dentry = 0; |
| 522 | struct inode *inode = d_inode(dentry); |
| 523 | struct v9fs_session_info __maybe_unused *v9ses; |
| 524 | struct p9_fid *fid = NULL; |
| 525 | struct p9_iattr_dotl p9attr = { |
| 526 | .uid = INVALID_UID, |
| 527 | .gid = INVALID_GID, |
| 528 | }; |
| 529 | |
| 530 | p9_debug(P9_DEBUG_VFS, "\n"); |
| 531 | |
| 532 | retval = setattr_prepare(&nop_mnt_idmap, dentry, iattr); |
| 533 | if (retval) |
| 534 | return retval; |
| 535 | |
| 536 | v9ses = v9fs_dentry2v9ses(dentry); |
| 537 | |
| 538 | p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid); |
| 539 | if (iattr->ia_valid & ATTR_MODE) |
| 540 | p9attr.mode = iattr->ia_mode; |
| 541 | if (iattr->ia_valid & ATTR_UID) |
| 542 | p9attr.uid = iattr->ia_uid; |
| 543 | if (iattr->ia_valid & ATTR_GID) |
| 544 | p9attr.gid = iattr->ia_gid; |
| 545 | if (iattr->ia_valid & ATTR_SIZE) |
| 546 | p9attr.size = iattr->ia_size; |
| 547 | if (iattr->ia_valid & ATTR_ATIME_SET) { |
| 548 | p9attr.atime_sec = iattr->ia_atime.tv_sec; |
| 549 | p9attr.atime_nsec = iattr->ia_atime.tv_nsec; |
| 550 | } |
| 551 | if (iattr->ia_valid & ATTR_MTIME_SET) { |
| 552 | p9attr.mtime_sec = iattr->ia_mtime.tv_sec; |
| 553 | p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec; |
| 554 | } |
| 555 | |
| 556 | if (iattr->ia_valid & ATTR_FILE) { |
| 557 | fid = iattr->ia_file->private_data; |
| 558 | WARN_ON(!fid); |
| 559 | } |
| 560 | if (!fid) { |
| 561 | fid = v9fs_fid_lookup(dentry); |
| 562 | use_dentry = 1; |
| 563 | } |
| 564 | if (IS_ERR(fid)) |
| 565 | return PTR_ERR(fid); |
| 566 | |
| 567 | /* Write all dirty data */ |
| 568 | if (S_ISREG(inode->i_mode)) { |
| 569 | retval = filemap_fdatawrite(inode->i_mapping); |
| 570 | if (retval < 0) |
| 571 | p9_debug(P9_DEBUG_ERROR, |
| 572 | "Flushing file prior to setattr failed: %d\n", retval); |
| 573 | } |
| 574 | |
| 575 | retval = p9_client_setattr(fid, &p9attr); |
| 576 | if (retval < 0) { |
| 577 | if (use_dentry) |
| 578 | p9_fid_put(fid); |
| 579 | return retval; |
| 580 | } |
| 581 | |
| 582 | if ((iattr->ia_valid & ATTR_SIZE) && iattr->ia_size != |
| 583 | i_size_read(inode)) { |
| 584 | truncate_setsize(inode, iattr->ia_size); |
| 585 | netfs_resize_file(netfs_inode(inode), iattr->ia_size, true); |
| 586 | |
| 587 | #ifdef CONFIG_9P_FSCACHE |
| 588 | if (v9ses->cache & CACHE_FSCACHE) |
| 589 | fscache_resize_cookie(v9fs_inode_cookie(V9FS_I(inode)), |
| 590 | iattr->ia_size); |
| 591 | #endif |
| 592 | } |
| 593 | |
| 594 | v9fs_invalidate_inode_attr(inode); |
| 595 | setattr_copy(&nop_mnt_idmap, inode, iattr); |
| 596 | mark_inode_dirty(inode); |
| 597 | if (iattr->ia_valid & ATTR_MODE) { |
| 598 | /* We also want to update ACL when we update mode bits */ |
| 599 | retval = v9fs_acl_chmod(inode, fid); |
| 600 | if (retval < 0) { |
| 601 | if (use_dentry) |
| 602 | p9_fid_put(fid); |
| 603 | return retval; |
| 604 | } |
| 605 | } |
| 606 | if (use_dentry) |
| 607 | p9_fid_put(fid); |
| 608 | |
| 609 | return 0; |
| 610 | } |
| 611 | |
| 612 | /** |
| 613 | * v9fs_stat2inode_dotl - populate an inode structure with stat info |
| 614 | * @stat: stat structure |
| 615 | * @inode: inode to populate |
| 616 | * @flags: ctrl flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE) |
| 617 | * |
| 618 | */ |
| 619 | |
| 620 | void |
| 621 | v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode, |
| 622 | unsigned int flags) |
| 623 | { |
| 624 | umode_t mode; |
| 625 | struct v9fs_inode *v9inode = V9FS_I(inode); |
| 626 | |
| 627 | if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) { |
| 628 | inode_set_atime(inode, stat->st_atime_sec, |
| 629 | stat->st_atime_nsec); |
| 630 | inode_set_mtime(inode, stat->st_mtime_sec, |
| 631 | stat->st_mtime_nsec); |
| 632 | inode_set_ctime(inode, stat->st_ctime_sec, |
| 633 | stat->st_ctime_nsec); |
| 634 | inode->i_uid = stat->st_uid; |
| 635 | inode->i_gid = stat->st_gid; |
| 636 | set_nlink(inode, stat->st_nlink); |
| 637 | |
| 638 | mode = stat->st_mode & S_IALLUGO; |
| 639 | mode |= inode->i_mode & ~S_IALLUGO; |
| 640 | inode->i_mode = mode; |
| 641 | |
| 642 | v9inode->netfs.remote_i_size = stat->st_size; |
| 643 | if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE)) |
| 644 | v9fs_i_size_write(inode, stat->st_size); |
| 645 | inode->i_blocks = stat->st_blocks; |
| 646 | } else { |
| 647 | if (stat->st_result_mask & P9_STATS_ATIME) { |
| 648 | inode_set_atime(inode, stat->st_atime_sec, |
| 649 | stat->st_atime_nsec); |
| 650 | } |
| 651 | if (stat->st_result_mask & P9_STATS_MTIME) { |
| 652 | inode_set_mtime(inode, stat->st_mtime_sec, |
| 653 | stat->st_mtime_nsec); |
| 654 | } |
| 655 | if (stat->st_result_mask & P9_STATS_CTIME) { |
| 656 | inode_set_ctime(inode, stat->st_ctime_sec, |
| 657 | stat->st_ctime_nsec); |
| 658 | } |
| 659 | if (stat->st_result_mask & P9_STATS_UID) |
| 660 | inode->i_uid = stat->st_uid; |
| 661 | if (stat->st_result_mask & P9_STATS_GID) |
| 662 | inode->i_gid = stat->st_gid; |
| 663 | if (stat->st_result_mask & P9_STATS_NLINK) |
| 664 | set_nlink(inode, stat->st_nlink); |
| 665 | if (stat->st_result_mask & P9_STATS_MODE) { |
| 666 | mode = stat->st_mode & S_IALLUGO; |
| 667 | mode |= inode->i_mode & ~S_IALLUGO; |
| 668 | inode->i_mode = mode; |
| 669 | } |
| 670 | if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE) && |
| 671 | stat->st_result_mask & P9_STATS_SIZE) { |
| 672 | v9inode->netfs.remote_i_size = stat->st_size; |
| 673 | v9fs_i_size_write(inode, stat->st_size); |
| 674 | } |
| 675 | if (stat->st_result_mask & P9_STATS_BLOCKS) |
| 676 | inode->i_blocks = stat->st_blocks; |
| 677 | } |
| 678 | if (stat->st_result_mask & P9_STATS_GEN) |
| 679 | inode->i_generation = stat->st_gen; |
| 680 | |
| 681 | /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION |
| 682 | * because the inode structure does not have fields for them. |
| 683 | */ |
| 684 | v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR; |
| 685 | } |
| 686 | |
| 687 | static int |
| 688 | v9fs_vfs_symlink_dotl(struct mnt_idmap *idmap, struct inode *dir, |
| 689 | struct dentry *dentry, const char *symname) |
| 690 | { |
| 691 | int err; |
| 692 | kgid_t gid; |
| 693 | const unsigned char *name; |
| 694 | struct p9_qid qid; |
| 695 | struct p9_fid *dfid; |
| 696 | struct p9_fid *fid = NULL; |
| 697 | |
| 698 | name = dentry->d_name.name; |
| 699 | p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname); |
| 700 | |
| 701 | dfid = v9fs_parent_fid(dentry); |
| 702 | if (IS_ERR(dfid)) { |
| 703 | err = PTR_ERR(dfid); |
| 704 | p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); |
| 705 | return err; |
| 706 | } |
| 707 | |
| 708 | gid = v9fs_get_fsgid_for_create(dir); |
| 709 | |
| 710 | /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */ |
| 711 | err = p9_client_symlink(dfid, name, symname, gid, &qid); |
| 712 | |
| 713 | if (err < 0) { |
| 714 | p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err); |
| 715 | goto error; |
| 716 | } |
| 717 | |
| 718 | v9fs_invalidate_inode_attr(dir); |
| 719 | |
| 720 | error: |
| 721 | p9_fid_put(fid); |
| 722 | p9_fid_put(dfid); |
| 723 | return err; |
| 724 | } |
| 725 | |
| 726 | /** |
| 727 | * v9fs_vfs_link_dotl - create a hardlink for dotl |
| 728 | * @old_dentry: dentry for file to link to |
| 729 | * @dir: inode destination for new link |
| 730 | * @dentry: dentry for link |
| 731 | * |
| 732 | */ |
| 733 | |
| 734 | static int |
| 735 | v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir, |
| 736 | struct dentry *dentry) |
| 737 | { |
| 738 | int err; |
| 739 | struct p9_fid *dfid, *oldfid; |
| 740 | struct v9fs_session_info *v9ses; |
| 741 | |
| 742 | p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %pd, new_name: %pd\n", |
| 743 | dir->i_ino, old_dentry, dentry); |
| 744 | |
| 745 | v9ses = v9fs_inode2v9ses(dir); |
| 746 | dfid = v9fs_parent_fid(dentry); |
| 747 | if (IS_ERR(dfid)) |
| 748 | return PTR_ERR(dfid); |
| 749 | |
| 750 | oldfid = v9fs_fid_lookup(old_dentry); |
| 751 | if (IS_ERR(oldfid)) { |
| 752 | p9_fid_put(dfid); |
| 753 | return PTR_ERR(oldfid); |
| 754 | } |
| 755 | |
| 756 | err = p9_client_link(dfid, oldfid, dentry->d_name.name); |
| 757 | |
| 758 | p9_fid_put(dfid); |
| 759 | p9_fid_put(oldfid); |
| 760 | if (err < 0) { |
| 761 | p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err); |
| 762 | return err; |
| 763 | } |
| 764 | |
| 765 | v9fs_invalidate_inode_attr(dir); |
| 766 | if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) { |
| 767 | /* Get the latest stat info from server. */ |
| 768 | struct p9_fid *fid; |
| 769 | |
| 770 | fid = v9fs_fid_lookup(old_dentry); |
| 771 | if (IS_ERR(fid)) |
| 772 | return PTR_ERR(fid); |
| 773 | |
| 774 | v9fs_refresh_inode_dotl(fid, d_inode(old_dentry)); |
| 775 | p9_fid_put(fid); |
| 776 | } |
| 777 | ihold(d_inode(old_dentry)); |
| 778 | d_instantiate(dentry, d_inode(old_dentry)); |
| 779 | |
| 780 | return err; |
| 781 | } |
| 782 | |
| 783 | /** |
| 784 | * v9fs_vfs_mknod_dotl - create a special file |
| 785 | * @idmap: The idmap of the mount |
| 786 | * @dir: inode destination for new link |
| 787 | * @dentry: dentry for file |
| 788 | * @omode: mode for creation |
| 789 | * @rdev: device associated with special file |
| 790 | * |
| 791 | */ |
| 792 | static int |
| 793 | v9fs_vfs_mknod_dotl(struct mnt_idmap *idmap, struct inode *dir, |
| 794 | struct dentry *dentry, umode_t omode, dev_t rdev) |
| 795 | { |
| 796 | int err; |
| 797 | kgid_t gid; |
| 798 | const unsigned char *name; |
| 799 | umode_t mode; |
| 800 | struct v9fs_session_info *v9ses; |
| 801 | struct p9_fid *fid = NULL, *dfid = NULL; |
| 802 | struct inode *inode; |
| 803 | struct p9_qid qid; |
| 804 | struct posix_acl *dacl = NULL, *pacl = NULL; |
| 805 | |
| 806 | p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %x MAJOR: %u MINOR: %u\n", |
| 807 | dir->i_ino, dentry, omode, |
| 808 | MAJOR(rdev), MINOR(rdev)); |
| 809 | |
| 810 | v9ses = v9fs_inode2v9ses(dir); |
| 811 | dfid = v9fs_parent_fid(dentry); |
| 812 | if (IS_ERR(dfid)) { |
| 813 | err = PTR_ERR(dfid); |
| 814 | p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); |
| 815 | goto error; |
| 816 | } |
| 817 | |
| 818 | gid = v9fs_get_fsgid_for_create(dir); |
| 819 | mode = omode; |
| 820 | /* Update mode based on ACL value */ |
| 821 | err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); |
| 822 | if (err) { |
| 823 | p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n", |
| 824 | err); |
| 825 | goto error; |
| 826 | } |
| 827 | name = dentry->d_name.name; |
| 828 | |
| 829 | err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid); |
| 830 | if (err < 0) |
| 831 | goto error; |
| 832 | |
| 833 | v9fs_invalidate_inode_attr(dir); |
| 834 | fid = p9_client_walk(dfid, 1, &name, 1); |
| 835 | if (IS_ERR(fid)) { |
| 836 | err = PTR_ERR(fid); |
| 837 | p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", |
| 838 | err); |
| 839 | goto error; |
| 840 | } |
| 841 | inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); |
| 842 | if (IS_ERR(inode)) { |
| 843 | err = PTR_ERR(inode); |
| 844 | p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", |
| 845 | err); |
| 846 | goto error; |
| 847 | } |
| 848 | v9fs_set_create_acl(inode, fid, dacl, pacl); |
| 849 | v9fs_fid_add(dentry, &fid); |
| 850 | d_instantiate(dentry, inode); |
| 851 | err = 0; |
| 852 | error: |
| 853 | p9_fid_put(fid); |
| 854 | v9fs_put_acl(dacl, pacl); |
| 855 | p9_fid_put(dfid); |
| 856 | |
| 857 | return err; |
| 858 | } |
| 859 | |
| 860 | /** |
| 861 | * v9fs_vfs_get_link_dotl - follow a symlink path |
| 862 | * @dentry: dentry for symlink |
| 863 | * @inode: inode for symlink |
| 864 | * @done: destructor for return value |
| 865 | */ |
| 866 | |
| 867 | static const char * |
| 868 | v9fs_vfs_get_link_dotl(struct dentry *dentry, |
| 869 | struct inode *inode, |
| 870 | struct delayed_call *done) |
| 871 | { |
| 872 | struct p9_fid *fid; |
| 873 | char *target; |
| 874 | int retval; |
| 875 | |
| 876 | if (!dentry) |
| 877 | return ERR_PTR(-ECHILD); |
| 878 | |
| 879 | p9_debug(P9_DEBUG_VFS, "%pd\n", dentry); |
| 880 | |
| 881 | fid = v9fs_fid_lookup(dentry); |
| 882 | if (IS_ERR(fid)) |
| 883 | return ERR_CAST(fid); |
| 884 | retval = p9_client_readlink(fid, &target); |
| 885 | p9_fid_put(fid); |
| 886 | if (retval) |
| 887 | return ERR_PTR(retval); |
| 888 | set_delayed_call(done, kfree_link, target); |
| 889 | return target; |
| 890 | } |
| 891 | |
| 892 | int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode) |
| 893 | { |
| 894 | struct p9_stat_dotl *st; |
| 895 | struct v9fs_session_info *v9ses; |
| 896 | unsigned int flags; |
| 897 | |
| 898 | v9ses = v9fs_inode2v9ses(inode); |
| 899 | st = p9_client_getattr_dotl(fid, P9_STATS_ALL); |
| 900 | if (IS_ERR(st)) |
| 901 | return PTR_ERR(st); |
| 902 | /* |
| 903 | * Don't update inode if the file type is different |
| 904 | */ |
| 905 | if (inode_wrong_type(inode, st->st_mode)) |
| 906 | goto out; |
| 907 | |
| 908 | /* |
| 909 | * We don't want to refresh inode->i_size, |
| 910 | * because we may have cached data |
| 911 | */ |
| 912 | flags = (v9ses->cache & CACHE_LOOSE) ? |
| 913 | V9FS_STAT2INODE_KEEP_ISIZE : 0; |
| 914 | v9fs_stat2inode_dotl(st, inode, flags); |
| 915 | out: |
| 916 | kfree(st); |
| 917 | return 0; |
| 918 | } |
| 919 | |
| 920 | const struct inode_operations v9fs_dir_inode_operations_dotl = { |
| 921 | .create = v9fs_vfs_create_dotl, |
| 922 | .atomic_open = v9fs_vfs_atomic_open_dotl, |
| 923 | .lookup = v9fs_vfs_lookup, |
| 924 | .link = v9fs_vfs_link_dotl, |
| 925 | .symlink = v9fs_vfs_symlink_dotl, |
| 926 | .unlink = v9fs_vfs_unlink, |
| 927 | .mkdir = v9fs_vfs_mkdir_dotl, |
| 928 | .rmdir = v9fs_vfs_rmdir, |
| 929 | .mknod = v9fs_vfs_mknod_dotl, |
| 930 | .rename = v9fs_vfs_rename, |
| 931 | .getattr = v9fs_vfs_getattr_dotl, |
| 932 | .setattr = v9fs_vfs_setattr_dotl, |
| 933 | .listxattr = v9fs_listxattr, |
| 934 | .get_inode_acl = v9fs_iop_get_inode_acl, |
| 935 | .get_acl = v9fs_iop_get_acl, |
| 936 | .set_acl = v9fs_iop_set_acl, |
| 937 | }; |
| 938 | |
| 939 | const struct inode_operations v9fs_file_inode_operations_dotl = { |
| 940 | .getattr = v9fs_vfs_getattr_dotl, |
| 941 | .setattr = v9fs_vfs_setattr_dotl, |
| 942 | .listxattr = v9fs_listxattr, |
| 943 | .get_inode_acl = v9fs_iop_get_inode_acl, |
| 944 | .get_acl = v9fs_iop_get_acl, |
| 945 | .set_acl = v9fs_iop_set_acl, |
| 946 | }; |
| 947 | |
| 948 | const struct inode_operations v9fs_symlink_inode_operations_dotl = { |
| 949 | .get_link = v9fs_vfs_get_link_dotl, |
| 950 | .getattr = v9fs_vfs_getattr_dotl, |
| 951 | .setattr = v9fs_vfs_setattr_dotl, |
| 952 | .listxattr = v9fs_listxattr, |
| 953 | }; |