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 unsigned long i_ino; 104 struct inode *inode; 105 struct v9fs_session_info *v9ses = sb->s_fs_info; 106 int (*test)(struct inode *inode, void *data); 107 108 if (new) 109 test = v9fs_test_new_inode_dotl; 110 else 111 test = v9fs_test_inode_dotl; 112 113 i_ino = v9fs_qid2ino(qid); 114 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode_dotl, st); 115 if (!inode) 116 return ERR_PTR(-ENOMEM); 117 if (!(inode->i_state & I_NEW)) 118 return inode; 119 /* 120 * initialize the inode with the stat info 121 * FIXME!! we may need support for stale inodes 122 * later. 123 */ 124 inode->i_ino = i_ino; 125 retval = v9fs_init_inode(v9ses, inode, 126 st->st_mode, new_decode_dev(st->st_rdev)); 127 if (retval) 128 goto error; 129 130 v9fs_stat2inode_dotl(st, inode, 0); 131 v9fs_set_netfs_context(inode); 132 v9fs_cache_inode_get_cookie(inode); 133 retval = v9fs_get_acl(inode, fid); 134 if (retval) 135 goto error; 136 137 unlock_new_inode(inode); 138 return inode; 139 error: 140 iget_failed(inode); 141 return ERR_PTR(retval); 142 143 } 144 145 struct inode * 146 v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid, 147 struct super_block *sb, int new) 148 { 149 struct p9_stat_dotl *st; 150 struct inode *inode = NULL; 151 152 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN); 153 if (IS_ERR(st)) 154 return ERR_CAST(st); 155 156 inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st, new); 157 kfree(st); 158 return inode; 159 } 160 161 struct dotl_openflag_map { 162 int open_flag; 163 int dotl_flag; 164 }; 165 166 static int v9fs_mapped_dotl_flags(int flags) 167 { 168 int i; 169 int rflags = 0; 170 struct dotl_openflag_map dotl_oflag_map[] = { 171 { O_CREAT, P9_DOTL_CREATE }, 172 { O_EXCL, P9_DOTL_EXCL }, 173 { O_NOCTTY, P9_DOTL_NOCTTY }, 174 { O_APPEND, P9_DOTL_APPEND }, 175 { O_NONBLOCK, P9_DOTL_NONBLOCK }, 176 { O_DSYNC, P9_DOTL_DSYNC }, 177 { FASYNC, P9_DOTL_FASYNC }, 178 { O_DIRECT, P9_DOTL_DIRECT }, 179 { O_LARGEFILE, P9_DOTL_LARGEFILE }, 180 { O_DIRECTORY, P9_DOTL_DIRECTORY }, 181 { O_NOFOLLOW, P9_DOTL_NOFOLLOW }, 182 { O_NOATIME, P9_DOTL_NOATIME }, 183 { O_CLOEXEC, P9_DOTL_CLOEXEC }, 184 { O_SYNC, P9_DOTL_SYNC}, 185 }; 186 for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) { 187 if (flags & dotl_oflag_map[i].open_flag) 188 rflags |= dotl_oflag_map[i].dotl_flag; 189 } 190 return rflags; 191 } 192 193 /** 194 * v9fs_open_to_dotl_flags- convert Linux specific open flags to 195 * plan 9 open flag. 196 * @flags: flags to convert 197 */ 198 int v9fs_open_to_dotl_flags(int flags) 199 { 200 int rflags = 0; 201 202 /* 203 * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY 204 * and P9_DOTL_NOACCESS 205 */ 206 rflags |= flags & O_ACCMODE; 207 rflags |= v9fs_mapped_dotl_flags(flags); 208 209 return rflags; 210 } 211 212 /** 213 * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol. 214 * @idmap: The user namespace of the mount 215 * @dir: directory inode that is being created 216 * @dentry: dentry that is being deleted 217 * @omode: create permissions 218 * @excl: True if the file must not yet exist 219 * 220 */ 221 static int 222 v9fs_vfs_create_dotl(struct mnt_idmap *idmap, struct inode *dir, 223 struct dentry *dentry, umode_t omode, bool excl) 224 { 225 return v9fs_vfs_mknod_dotl(idmap, dir, dentry, omode, 0); 226 } 227 228 static int 229 v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry, 230 struct file *file, unsigned int flags, umode_t omode) 231 { 232 int err = 0; 233 kgid_t gid; 234 umode_t mode; 235 int p9_omode = v9fs_open_to_dotl_flags(flags); 236 const unsigned char *name = NULL; 237 struct p9_qid qid; 238 struct inode *inode; 239 struct p9_fid *fid = NULL; 240 struct p9_fid *dfid = NULL, *ofid = NULL; 241 struct v9fs_session_info *v9ses; 242 struct posix_acl *pacl = NULL, *dacl = NULL; 243 struct dentry *res = NULL; 244 245 if (d_in_lookup(dentry)) { 246 res = v9fs_vfs_lookup(dir, dentry, 0); 247 if (IS_ERR(res)) 248 return PTR_ERR(res); 249 250 if (res) 251 dentry = res; 252 } 253 254 /* Only creates */ 255 if (!(flags & O_CREAT) || d_really_is_positive(dentry)) 256 return finish_no_open(file, res); 257 258 v9ses = v9fs_inode2v9ses(dir); 259 260 name = dentry->d_name.name; 261 p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%x\n", 262 name, flags, omode); 263 264 dfid = v9fs_parent_fid(dentry); 265 if (IS_ERR(dfid)) { 266 err = PTR_ERR(dfid); 267 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 268 goto out; 269 } 270 271 /* clone a fid to use for creation */ 272 ofid = clone_fid(dfid); 273 if (IS_ERR(ofid)) { 274 err = PTR_ERR(ofid); 275 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 276 goto out; 277 } 278 279 gid = v9fs_get_fsgid_for_create(dir); 280 281 mode = omode; 282 /* Update mode based on ACL value */ 283 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); 284 if (err) { 285 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in create %d\n", 286 err); 287 goto out; 288 } 289 290 if ((v9ses->cache & CACHE_WRITEBACK) && (p9_omode & P9_OWRITE)) { 291 p9_omode = (p9_omode & ~P9_OWRITE) | P9_ORDWR; 292 p9_debug(P9_DEBUG_CACHE, 293 "write-only file with writeback enabled, creating w/ O_RDWR\n"); 294 } 295 err = p9_client_create_dotl(ofid, name, p9_omode, mode, gid, &qid); 296 if (err < 0) { 297 p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in create %d\n", 298 err); 299 goto out; 300 } 301 v9fs_invalidate_inode_attr(dir); 302 303 /* instantiate inode and assign the unopened fid to the dentry */ 304 fid = p9_client_walk(dfid, 1, &name, 1); 305 if (IS_ERR(fid)) { 306 err = PTR_ERR(fid); 307 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 308 goto out; 309 } 310 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 311 if (IS_ERR(inode)) { 312 err = PTR_ERR(inode); 313 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err); 314 goto out; 315 } 316 /* Now set the ACL based on the default value */ 317 v9fs_set_create_acl(inode, fid, dacl, pacl); 318 319 v9fs_fid_add(dentry, &fid); 320 d_instantiate(dentry, inode); 321 322 /* Since we are opening a file, assign the open fid to the file */ 323 err = finish_open(file, dentry, generic_file_open); 324 if (err) 325 goto out; 326 file->private_data = ofid; 327 #ifdef CONFIG_9P_FSCACHE 328 if (v9ses->cache & CACHE_FSCACHE) { 329 struct v9fs_inode *v9inode = V9FS_I(inode); 330 fscache_use_cookie(v9fs_inode_cookie(v9inode), 331 file->f_mode & FMODE_WRITE); 332 } 333 #endif 334 v9fs_fid_add_modes(ofid, v9ses->flags, v9ses->cache, flags); 335 v9fs_open_fid_add(inode, &ofid); 336 file->f_mode |= FMODE_CREATED; 337 out: 338 p9_fid_put(dfid); 339 p9_fid_put(ofid); 340 p9_fid_put(fid); 341 v9fs_put_acl(dacl, pacl); 342 dput(res); 343 return err; 344 } 345 346 /** 347 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory 348 * @idmap: The idmap of the mount 349 * @dir: inode that is being unlinked 350 * @dentry: dentry that is being unlinked 351 * @omode: mode for new directory 352 * 353 */ 354 355 static int v9fs_vfs_mkdir_dotl(struct mnt_idmap *idmap, 356 struct inode *dir, struct dentry *dentry, 357 umode_t omode) 358 { 359 int err; 360 struct v9fs_session_info *v9ses; 361 struct p9_fid *fid = NULL, *dfid = NULL; 362 kgid_t gid; 363 const unsigned char *name; 364 umode_t mode; 365 struct inode *inode; 366 struct p9_qid qid; 367 struct posix_acl *dacl = NULL, *pacl = NULL; 368 369 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry); 370 v9ses = v9fs_inode2v9ses(dir); 371 372 omode |= S_IFDIR; 373 if (dir->i_mode & S_ISGID) 374 omode |= S_ISGID; 375 376 dfid = v9fs_parent_fid(dentry); 377 if (IS_ERR(dfid)) { 378 err = PTR_ERR(dfid); 379 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 380 goto error; 381 } 382 383 gid = v9fs_get_fsgid_for_create(dir); 384 mode = omode; 385 /* Update mode based on ACL value */ 386 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); 387 if (err) { 388 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n", 389 err); 390 goto error; 391 } 392 name = dentry->d_name.name; 393 err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid); 394 if (err < 0) 395 goto error; 396 fid = p9_client_walk(dfid, 1, &name, 1); 397 if (IS_ERR(fid)) { 398 err = PTR_ERR(fid); 399 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", 400 err); 401 goto error; 402 } 403 404 /* instantiate inode and assign the unopened fid to the dentry */ 405 if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) { 406 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 407 if (IS_ERR(inode)) { 408 err = PTR_ERR(inode); 409 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", 410 err); 411 goto error; 412 } 413 v9fs_fid_add(dentry, &fid); 414 v9fs_set_create_acl(inode, fid, dacl, pacl); 415 d_instantiate(dentry, inode); 416 err = 0; 417 } else { 418 /* 419 * Not in cached mode. No need to populate 420 * inode with stat. We need to get an inode 421 * so that we can set the acl with dentry 422 */ 423 inode = v9fs_get_inode(dir->i_sb, mode, 0); 424 if (IS_ERR(inode)) { 425 err = PTR_ERR(inode); 426 goto error; 427 } 428 v9fs_set_create_acl(inode, fid, dacl, pacl); 429 d_instantiate(dentry, inode); 430 } 431 inc_nlink(dir); 432 v9fs_invalidate_inode_attr(dir); 433 error: 434 p9_fid_put(fid); 435 v9fs_put_acl(dacl, pacl); 436 p9_fid_put(dfid); 437 return err; 438 } 439 440 static int 441 v9fs_vfs_getattr_dotl(struct mnt_idmap *idmap, 442 const struct path *path, struct kstat *stat, 443 u32 request_mask, unsigned int flags) 444 { 445 struct dentry *dentry = path->dentry; 446 struct v9fs_session_info *v9ses; 447 struct p9_fid *fid; 448 struct inode *inode = d_inode(dentry); 449 struct p9_stat_dotl *st; 450 451 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry); 452 v9ses = v9fs_dentry2v9ses(dentry); 453 if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) { 454 generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat); 455 return 0; 456 } else if (v9ses->cache) { 457 if (S_ISREG(inode->i_mode)) { 458 int retval = filemap_fdatawrite(inode->i_mapping); 459 460 if (retval) 461 p9_debug(P9_DEBUG_ERROR, 462 "flushing writeback during getattr returned %d\n", retval); 463 } 464 } 465 fid = v9fs_fid_lookup(dentry); 466 if (IS_ERR(fid)) 467 return PTR_ERR(fid); 468 469 /* Ask for all the fields in stat structure. Server will return 470 * whatever it supports 471 */ 472 473 st = p9_client_getattr_dotl(fid, P9_STATS_ALL); 474 p9_fid_put(fid); 475 if (IS_ERR(st)) 476 return PTR_ERR(st); 477 478 v9fs_stat2inode_dotl(st, d_inode(dentry), 0); 479 generic_fillattr(&nop_mnt_idmap, request_mask, d_inode(dentry), stat); 480 /* Change block size to what the server returned */ 481 stat->blksize = st->st_blksize; 482 483 kfree(st); 484 return 0; 485 } 486 487 /* 488 * Attribute flags. 489 */ 490 #define P9_ATTR_MODE (1 << 0) 491 #define P9_ATTR_UID (1 << 1) 492 #define P9_ATTR_GID (1 << 2) 493 #define P9_ATTR_SIZE (1 << 3) 494 #define P9_ATTR_ATIME (1 << 4) 495 #define P9_ATTR_MTIME (1 << 5) 496 #define P9_ATTR_CTIME (1 << 6) 497 #define P9_ATTR_ATIME_SET (1 << 7) 498 #define P9_ATTR_MTIME_SET (1 << 8) 499 500 struct dotl_iattr_map { 501 int iattr_valid; 502 int p9_iattr_valid; 503 }; 504 505 static int v9fs_mapped_iattr_valid(int iattr_valid) 506 { 507 int i; 508 int p9_iattr_valid = 0; 509 struct dotl_iattr_map dotl_iattr_map[] = { 510 { ATTR_MODE, P9_ATTR_MODE }, 511 { ATTR_UID, P9_ATTR_UID }, 512 { ATTR_GID, P9_ATTR_GID }, 513 { ATTR_SIZE, P9_ATTR_SIZE }, 514 { ATTR_ATIME, P9_ATTR_ATIME }, 515 { ATTR_MTIME, P9_ATTR_MTIME }, 516 { ATTR_CTIME, P9_ATTR_CTIME }, 517 { ATTR_ATIME_SET, P9_ATTR_ATIME_SET }, 518 { ATTR_MTIME_SET, P9_ATTR_MTIME_SET }, 519 }; 520 for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) { 521 if (iattr_valid & dotl_iattr_map[i].iattr_valid) 522 p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid; 523 } 524 return p9_iattr_valid; 525 } 526 527 /** 528 * v9fs_vfs_setattr_dotl - set file metadata 529 * @idmap: idmap of the mount 530 * @dentry: file whose metadata to set 531 * @iattr: metadata assignment structure 532 * 533 */ 534 535 int v9fs_vfs_setattr_dotl(struct mnt_idmap *idmap, 536 struct dentry *dentry, struct iattr *iattr) 537 { 538 int retval, use_dentry = 0; 539 struct inode *inode = d_inode(dentry); 540 struct v9fs_session_info __maybe_unused *v9ses; 541 struct p9_fid *fid = NULL; 542 struct p9_iattr_dotl p9attr = { 543 .uid = INVALID_UID, 544 .gid = INVALID_GID, 545 }; 546 547 p9_debug(P9_DEBUG_VFS, "\n"); 548 549 retval = setattr_prepare(&nop_mnt_idmap, dentry, iattr); 550 if (retval) 551 return retval; 552 553 v9ses = v9fs_dentry2v9ses(dentry); 554 555 p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid); 556 if (iattr->ia_valid & ATTR_MODE) 557 p9attr.mode = iattr->ia_mode; 558 if (iattr->ia_valid & ATTR_UID) 559 p9attr.uid = iattr->ia_uid; 560 if (iattr->ia_valid & ATTR_GID) 561 p9attr.gid = iattr->ia_gid; 562 if (iattr->ia_valid & ATTR_SIZE) 563 p9attr.size = iattr->ia_size; 564 if (iattr->ia_valid & ATTR_ATIME_SET) { 565 p9attr.atime_sec = iattr->ia_atime.tv_sec; 566 p9attr.atime_nsec = iattr->ia_atime.tv_nsec; 567 } 568 if (iattr->ia_valid & ATTR_MTIME_SET) { 569 p9attr.mtime_sec = iattr->ia_mtime.tv_sec; 570 p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec; 571 } 572 573 if (iattr->ia_valid & ATTR_FILE) { 574 fid = iattr->ia_file->private_data; 575 WARN_ON(!fid); 576 } 577 if (!fid) { 578 fid = v9fs_fid_lookup(dentry); 579 use_dentry = 1; 580 } 581 if (IS_ERR(fid)) 582 return PTR_ERR(fid); 583 584 /* Write all dirty data */ 585 if (S_ISREG(inode->i_mode)) { 586 retval = filemap_fdatawrite(inode->i_mapping); 587 if (retval < 0) 588 p9_debug(P9_DEBUG_ERROR, 589 "Flushing file prior to setattr failed: %d\n", retval); 590 } 591 592 retval = p9_client_setattr(fid, &p9attr); 593 if (retval < 0) { 594 if (use_dentry) 595 p9_fid_put(fid); 596 return retval; 597 } 598 599 if ((iattr->ia_valid & ATTR_SIZE) && iattr->ia_size != 600 i_size_read(inode)) { 601 truncate_setsize(inode, iattr->ia_size); 602 netfs_resize_file(netfs_inode(inode), iattr->ia_size, true); 603 604 #ifdef CONFIG_9P_FSCACHE 605 if (v9ses->cache & CACHE_FSCACHE) 606 fscache_resize_cookie(v9fs_inode_cookie(V9FS_I(inode)), 607 iattr->ia_size); 608 #endif 609 } 610 611 v9fs_invalidate_inode_attr(inode); 612 setattr_copy(&nop_mnt_idmap, inode, iattr); 613 mark_inode_dirty(inode); 614 if (iattr->ia_valid & ATTR_MODE) { 615 /* We also want to update ACL when we update mode bits */ 616 retval = v9fs_acl_chmod(inode, fid); 617 if (retval < 0) { 618 if (use_dentry) 619 p9_fid_put(fid); 620 return retval; 621 } 622 } 623 if (use_dentry) 624 p9_fid_put(fid); 625 626 return 0; 627 } 628 629 /** 630 * v9fs_stat2inode_dotl - populate an inode structure with stat info 631 * @stat: stat structure 632 * @inode: inode to populate 633 * @flags: ctrl flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE) 634 * 635 */ 636 637 void 638 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode, 639 unsigned int flags) 640 { 641 umode_t mode; 642 struct v9fs_inode *v9inode = V9FS_I(inode); 643 644 if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) { 645 inode_set_atime(inode, stat->st_atime_sec, 646 stat->st_atime_nsec); 647 inode_set_mtime(inode, stat->st_mtime_sec, 648 stat->st_mtime_nsec); 649 inode_set_ctime(inode, stat->st_ctime_sec, 650 stat->st_ctime_nsec); 651 inode->i_uid = stat->st_uid; 652 inode->i_gid = stat->st_gid; 653 set_nlink(inode, stat->st_nlink); 654 655 mode = stat->st_mode & S_IALLUGO; 656 mode |= inode->i_mode & ~S_IALLUGO; 657 inode->i_mode = mode; 658 659 v9inode->netfs.remote_i_size = stat->st_size; 660 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE)) 661 v9fs_i_size_write(inode, stat->st_size); 662 inode->i_blocks = stat->st_blocks; 663 } else { 664 if (stat->st_result_mask & P9_STATS_ATIME) { 665 inode_set_atime(inode, stat->st_atime_sec, 666 stat->st_atime_nsec); 667 } 668 if (stat->st_result_mask & P9_STATS_MTIME) { 669 inode_set_mtime(inode, stat->st_mtime_sec, 670 stat->st_mtime_nsec); 671 } 672 if (stat->st_result_mask & P9_STATS_CTIME) { 673 inode_set_ctime(inode, stat->st_ctime_sec, 674 stat->st_ctime_nsec); 675 } 676 if (stat->st_result_mask & P9_STATS_UID) 677 inode->i_uid = stat->st_uid; 678 if (stat->st_result_mask & P9_STATS_GID) 679 inode->i_gid = stat->st_gid; 680 if (stat->st_result_mask & P9_STATS_NLINK) 681 set_nlink(inode, stat->st_nlink); 682 if (stat->st_result_mask & P9_STATS_MODE) { 683 mode = stat->st_mode & S_IALLUGO; 684 mode |= inode->i_mode & ~S_IALLUGO; 685 inode->i_mode = mode; 686 } 687 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE) && 688 stat->st_result_mask & P9_STATS_SIZE) { 689 v9inode->netfs.remote_i_size = stat->st_size; 690 v9fs_i_size_write(inode, stat->st_size); 691 } 692 if (stat->st_result_mask & P9_STATS_BLOCKS) 693 inode->i_blocks = stat->st_blocks; 694 } 695 if (stat->st_result_mask & P9_STATS_GEN) 696 inode->i_generation = stat->st_gen; 697 698 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION 699 * because the inode structure does not have fields for them. 700 */ 701 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR; 702 } 703 704 static int 705 v9fs_vfs_symlink_dotl(struct mnt_idmap *idmap, struct inode *dir, 706 struct dentry *dentry, const char *symname) 707 { 708 int err; 709 kgid_t gid; 710 const unsigned char *name; 711 struct p9_qid qid; 712 struct inode *inode; 713 struct p9_fid *dfid; 714 struct p9_fid *fid = NULL; 715 struct v9fs_session_info *v9ses; 716 717 name = dentry->d_name.name; 718 p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname); 719 v9ses = v9fs_inode2v9ses(dir); 720 721 dfid = v9fs_parent_fid(dentry); 722 if (IS_ERR(dfid)) { 723 err = PTR_ERR(dfid); 724 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 725 return err; 726 } 727 728 gid = v9fs_get_fsgid_for_create(dir); 729 730 /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */ 731 err = p9_client_symlink(dfid, name, symname, gid, &qid); 732 733 if (err < 0) { 734 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err); 735 goto error; 736 } 737 738 v9fs_invalidate_inode_attr(dir); 739 if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) { 740 /* Now walk from the parent so we can get an unopened fid. */ 741 fid = p9_client_walk(dfid, 1, &name, 1); 742 if (IS_ERR(fid)) { 743 err = PTR_ERR(fid); 744 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", 745 err); 746 goto error; 747 } 748 749 /* instantiate inode and assign the unopened fid to dentry */ 750 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 751 if (IS_ERR(inode)) { 752 err = PTR_ERR(inode); 753 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", 754 err); 755 goto error; 756 } 757 v9fs_fid_add(dentry, &fid); 758 d_instantiate(dentry, inode); 759 err = 0; 760 } else { 761 /* Not in cached mode. No need to populate inode with stat */ 762 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0); 763 if (IS_ERR(inode)) { 764 err = PTR_ERR(inode); 765 goto error; 766 } 767 d_instantiate(dentry, inode); 768 } 769 770 error: 771 p9_fid_put(fid); 772 p9_fid_put(dfid); 773 return err; 774 } 775 776 /** 777 * v9fs_vfs_link_dotl - create a hardlink for dotl 778 * @old_dentry: dentry for file to link to 779 * @dir: inode destination for new link 780 * @dentry: dentry for link 781 * 782 */ 783 784 static int 785 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir, 786 struct dentry *dentry) 787 { 788 int err; 789 struct p9_fid *dfid, *oldfid; 790 struct v9fs_session_info *v9ses; 791 792 p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %pd, new_name: %pd\n", 793 dir->i_ino, old_dentry, dentry); 794 795 v9ses = v9fs_inode2v9ses(dir); 796 dfid = v9fs_parent_fid(dentry); 797 if (IS_ERR(dfid)) 798 return PTR_ERR(dfid); 799 800 oldfid = v9fs_fid_lookup(old_dentry); 801 if (IS_ERR(oldfid)) { 802 p9_fid_put(dfid); 803 return PTR_ERR(oldfid); 804 } 805 806 err = p9_client_link(dfid, oldfid, dentry->d_name.name); 807 808 p9_fid_put(dfid); 809 p9_fid_put(oldfid); 810 if (err < 0) { 811 p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err); 812 return err; 813 } 814 815 v9fs_invalidate_inode_attr(dir); 816 if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) { 817 /* Get the latest stat info from server. */ 818 struct p9_fid *fid; 819 820 fid = v9fs_fid_lookup(old_dentry); 821 if (IS_ERR(fid)) 822 return PTR_ERR(fid); 823 824 v9fs_refresh_inode_dotl(fid, d_inode(old_dentry)); 825 p9_fid_put(fid); 826 } 827 ihold(d_inode(old_dentry)); 828 d_instantiate(dentry, d_inode(old_dentry)); 829 830 return err; 831 } 832 833 /** 834 * v9fs_vfs_mknod_dotl - create a special file 835 * @idmap: The idmap of the mount 836 * @dir: inode destination for new link 837 * @dentry: dentry for file 838 * @omode: mode for creation 839 * @rdev: device associated with special file 840 * 841 */ 842 static int 843 v9fs_vfs_mknod_dotl(struct mnt_idmap *idmap, struct inode *dir, 844 struct dentry *dentry, umode_t omode, dev_t rdev) 845 { 846 int err; 847 kgid_t gid; 848 const unsigned char *name; 849 umode_t mode; 850 struct v9fs_session_info *v9ses; 851 struct p9_fid *fid = NULL, *dfid = NULL; 852 struct inode *inode; 853 struct p9_qid qid; 854 struct posix_acl *dacl = NULL, *pacl = NULL; 855 856 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %x MAJOR: %u MINOR: %u\n", 857 dir->i_ino, dentry, omode, 858 MAJOR(rdev), MINOR(rdev)); 859 860 v9ses = v9fs_inode2v9ses(dir); 861 dfid = v9fs_parent_fid(dentry); 862 if (IS_ERR(dfid)) { 863 err = PTR_ERR(dfid); 864 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 865 goto error; 866 } 867 868 gid = v9fs_get_fsgid_for_create(dir); 869 mode = omode; 870 /* Update mode based on ACL value */ 871 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); 872 if (err) { 873 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n", 874 err); 875 goto error; 876 } 877 name = dentry->d_name.name; 878 879 err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid); 880 if (err < 0) 881 goto error; 882 883 v9fs_invalidate_inode_attr(dir); 884 fid = p9_client_walk(dfid, 1, &name, 1); 885 if (IS_ERR(fid)) { 886 err = PTR_ERR(fid); 887 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", 888 err); 889 goto error; 890 } 891 892 /* instantiate inode and assign the unopened fid to the dentry */ 893 if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) { 894 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 895 if (IS_ERR(inode)) { 896 err = PTR_ERR(inode); 897 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", 898 err); 899 goto error; 900 } 901 v9fs_set_create_acl(inode, fid, dacl, pacl); 902 v9fs_fid_add(dentry, &fid); 903 d_instantiate(dentry, inode); 904 err = 0; 905 } else { 906 /* 907 * Not in cached mode. No need to populate inode with stat. 908 * socket syscall returns a fd, so we need instantiate 909 */ 910 inode = v9fs_get_inode(dir->i_sb, mode, rdev); 911 if (IS_ERR(inode)) { 912 err = PTR_ERR(inode); 913 goto error; 914 } 915 v9fs_set_create_acl(inode, fid, dacl, pacl); 916 d_instantiate(dentry, inode); 917 } 918 error: 919 p9_fid_put(fid); 920 v9fs_put_acl(dacl, pacl); 921 p9_fid_put(dfid); 922 923 return err; 924 } 925 926 /** 927 * v9fs_vfs_get_link_dotl - follow a symlink path 928 * @dentry: dentry for symlink 929 * @inode: inode for symlink 930 * @done: destructor for return value 931 */ 932 933 static const char * 934 v9fs_vfs_get_link_dotl(struct dentry *dentry, 935 struct inode *inode, 936 struct delayed_call *done) 937 { 938 struct p9_fid *fid; 939 char *target; 940 int retval; 941 942 if (!dentry) 943 return ERR_PTR(-ECHILD); 944 945 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry); 946 947 fid = v9fs_fid_lookup(dentry); 948 if (IS_ERR(fid)) 949 return ERR_CAST(fid); 950 retval = p9_client_readlink(fid, &target); 951 p9_fid_put(fid); 952 if (retval) 953 return ERR_PTR(retval); 954 set_delayed_call(done, kfree_link, target); 955 return target; 956 } 957 958 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode) 959 { 960 struct p9_stat_dotl *st; 961 struct v9fs_session_info *v9ses; 962 unsigned int flags; 963 964 v9ses = v9fs_inode2v9ses(inode); 965 st = p9_client_getattr_dotl(fid, P9_STATS_ALL); 966 if (IS_ERR(st)) 967 return PTR_ERR(st); 968 /* 969 * Don't update inode if the file type is different 970 */ 971 if (inode_wrong_type(inode, st->st_mode)) 972 goto out; 973 974 /* 975 * We don't want to refresh inode->i_size, 976 * because we may have cached data 977 */ 978 flags = (v9ses->cache & CACHE_LOOSE) ? 979 V9FS_STAT2INODE_KEEP_ISIZE : 0; 980 v9fs_stat2inode_dotl(st, inode, flags); 981 out: 982 kfree(st); 983 return 0; 984 } 985 986 const struct inode_operations v9fs_dir_inode_operations_dotl = { 987 .create = v9fs_vfs_create_dotl, 988 .atomic_open = v9fs_vfs_atomic_open_dotl, 989 .lookup = v9fs_vfs_lookup, 990 .link = v9fs_vfs_link_dotl, 991 .symlink = v9fs_vfs_symlink_dotl, 992 .unlink = v9fs_vfs_unlink, 993 .mkdir = v9fs_vfs_mkdir_dotl, 994 .rmdir = v9fs_vfs_rmdir, 995 .mknod = v9fs_vfs_mknod_dotl, 996 .rename = v9fs_vfs_rename, 997 .getattr = v9fs_vfs_getattr_dotl, 998 .setattr = v9fs_vfs_setattr_dotl, 999 .listxattr = v9fs_listxattr, 1000 .get_inode_acl = v9fs_iop_get_inode_acl, 1001 .get_acl = v9fs_iop_get_acl, 1002 .set_acl = v9fs_iop_set_acl, 1003 }; 1004 1005 const struct inode_operations v9fs_file_inode_operations_dotl = { 1006 .getattr = v9fs_vfs_getattr_dotl, 1007 .setattr = v9fs_vfs_setattr_dotl, 1008 .listxattr = v9fs_listxattr, 1009 .get_inode_acl = v9fs_iop_get_inode_acl, 1010 .get_acl = v9fs_iop_get_acl, 1011 .set_acl = v9fs_iop_set_acl, 1012 }; 1013 1014 const struct inode_operations v9fs_symlink_inode_operations_dotl = { 1015 .get_link = v9fs_vfs_get_link_dotl, 1016 .getattr = v9fs_vfs_getattr_dotl, 1017 .setattr = v9fs_vfs_setattr_dotl, 1018 .listxattr = v9fs_listxattr, 1019 }; 1020