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 int 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_fid_add(dentry, &fid); 411 v9fs_set_create_acl(inode, fid, dacl, pacl); 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; 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 }; 954