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_cache_inode_get_cookie(inode); 132 retval = v9fs_get_acl(inode, fid); 133 if (retval) 134 goto error; 135 136 unlock_new_inode(inode); 137 return inode; 138 error: 139 iget_failed(inode); 140 return ERR_PTR(retval); 141 142 } 143 144 struct inode * 145 v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid, 146 struct super_block *sb, int new) 147 { 148 struct p9_stat_dotl *st; 149 struct inode *inode = NULL; 150 151 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN); 152 if (IS_ERR(st)) 153 return ERR_CAST(st); 154 155 inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st, new); 156 kfree(st); 157 return inode; 158 } 159 160 struct dotl_openflag_map { 161 int open_flag; 162 int dotl_flag; 163 }; 164 165 static int v9fs_mapped_dotl_flags(int flags) 166 { 167 int i; 168 int rflags = 0; 169 struct dotl_openflag_map dotl_oflag_map[] = { 170 { O_CREAT, P9_DOTL_CREATE }, 171 { O_EXCL, P9_DOTL_EXCL }, 172 { O_NOCTTY, P9_DOTL_NOCTTY }, 173 { O_APPEND, P9_DOTL_APPEND }, 174 { O_NONBLOCK, P9_DOTL_NONBLOCK }, 175 { O_DSYNC, P9_DOTL_DSYNC }, 176 { FASYNC, P9_DOTL_FASYNC }, 177 { O_DIRECT, P9_DOTL_DIRECT }, 178 { O_LARGEFILE, P9_DOTL_LARGEFILE }, 179 { O_DIRECTORY, P9_DOTL_DIRECTORY }, 180 { O_NOFOLLOW, P9_DOTL_NOFOLLOW }, 181 { O_NOATIME, P9_DOTL_NOATIME }, 182 { O_CLOEXEC, P9_DOTL_CLOEXEC }, 183 { O_SYNC, P9_DOTL_SYNC}, 184 }; 185 for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) { 186 if (flags & dotl_oflag_map[i].open_flag) 187 rflags |= dotl_oflag_map[i].dotl_flag; 188 } 189 return rflags; 190 } 191 192 /** 193 * v9fs_open_to_dotl_flags- convert Linux specific open flags to 194 * plan 9 open flag. 195 * @flags: flags to convert 196 */ 197 int v9fs_open_to_dotl_flags(int flags) 198 { 199 int rflags = 0; 200 201 /* 202 * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY 203 * and P9_DOTL_NOACCESS 204 */ 205 rflags |= flags & O_ACCMODE; 206 rflags |= v9fs_mapped_dotl_flags(flags); 207 208 return rflags; 209 } 210 211 /** 212 * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol. 213 * @idmap: The user namespace of the mount 214 * @dir: directory inode that is being created 215 * @dentry: dentry that is being deleted 216 * @omode: create permissions 217 * @excl: True if the file must not yet exist 218 * 219 */ 220 static int 221 v9fs_vfs_create_dotl(struct mnt_idmap *idmap, struct inode *dir, 222 struct dentry *dentry, umode_t omode, bool excl) 223 { 224 return v9fs_vfs_mknod_dotl(idmap, dir, dentry, omode, 0); 225 } 226 227 static int 228 v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry, 229 struct file *file, unsigned int flags, umode_t omode) 230 { 231 int err = 0; 232 kgid_t gid; 233 umode_t mode; 234 int p9_omode = v9fs_open_to_dotl_flags(flags); 235 const unsigned char *name = NULL; 236 struct p9_qid qid; 237 struct inode *inode; 238 struct p9_fid *fid = NULL; 239 struct p9_fid *dfid = NULL, *ofid = NULL; 240 struct v9fs_session_info *v9ses; 241 struct posix_acl *pacl = NULL, *dacl = NULL; 242 struct dentry *res = NULL; 243 244 if (d_in_lookup(dentry)) { 245 res = v9fs_vfs_lookup(dir, dentry, 0); 246 if (IS_ERR(res)) 247 return PTR_ERR(res); 248 249 if (res) 250 dentry = res; 251 } 252 253 /* Only creates */ 254 if (!(flags & O_CREAT) || d_really_is_positive(dentry)) 255 return finish_no_open(file, res); 256 257 v9ses = v9fs_inode2v9ses(dir); 258 259 name = dentry->d_name.name; 260 p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%x\n", 261 name, flags, omode); 262 263 dfid = v9fs_parent_fid(dentry); 264 if (IS_ERR(dfid)) { 265 err = PTR_ERR(dfid); 266 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 267 goto out; 268 } 269 270 /* clone a fid to use for creation */ 271 ofid = clone_fid(dfid); 272 if (IS_ERR(ofid)) { 273 err = PTR_ERR(ofid); 274 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 275 goto out; 276 } 277 278 gid = v9fs_get_fsgid_for_create(dir); 279 280 mode = omode; 281 /* Update mode based on ACL value */ 282 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); 283 if (err) { 284 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in create %d\n", 285 err); 286 goto out; 287 } 288 289 if ((v9ses->cache & CACHE_WRITEBACK) && (p9_omode & P9_OWRITE)) { 290 p9_omode = (p9_omode & ~P9_OWRITE) | P9_ORDWR; 291 p9_debug(P9_DEBUG_CACHE, 292 "write-only file with writeback enabled, creating w/ O_RDWR\n"); 293 } 294 err = p9_client_create_dotl(ofid, name, p9_omode, mode, gid, &qid); 295 if (err < 0) { 296 p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in create %d\n", 297 err); 298 goto out; 299 } 300 v9fs_invalidate_inode_attr(dir); 301 302 /* instantiate inode and assign the unopened fid to the dentry */ 303 fid = p9_client_walk(dfid, 1, &name, 1); 304 if (IS_ERR(fid)) { 305 err = PTR_ERR(fid); 306 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 307 goto out; 308 } 309 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 310 if (IS_ERR(inode)) { 311 err = PTR_ERR(inode); 312 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err); 313 goto out; 314 } 315 /* Now set the ACL based on the default value */ 316 v9fs_set_create_acl(inode, fid, dacl, pacl); 317 318 v9fs_fid_add(dentry, &fid); 319 d_instantiate(dentry, inode); 320 321 /* Since we are opening a file, assign the open fid to the file */ 322 err = finish_open(file, dentry, generic_file_open); 323 if (err) 324 goto out; 325 file->private_data = ofid; 326 #ifdef CONFIG_9P_FSCACHE 327 if (v9ses->cache & CACHE_FSCACHE) { 328 struct v9fs_inode *v9inode = V9FS_I(inode); 329 fscache_use_cookie(v9fs_inode_cookie(v9inode), 330 file->f_mode & FMODE_WRITE); 331 } 332 #endif 333 v9fs_fid_add_modes(ofid, v9ses->flags, v9ses->cache, flags); 334 v9fs_open_fid_add(inode, &ofid); 335 file->f_mode |= FMODE_CREATED; 336 out: 337 p9_fid_put(dfid); 338 p9_fid_put(ofid); 339 p9_fid_put(fid); 340 v9fs_put_acl(dacl, pacl); 341 dput(res); 342 return err; 343 } 344 345 /** 346 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory 347 * @idmap: The idmap of the mount 348 * @dir: inode that is being unlinked 349 * @dentry: dentry that is being unlinked 350 * @omode: mode for new directory 351 * 352 */ 353 354 static int v9fs_vfs_mkdir_dotl(struct mnt_idmap *idmap, 355 struct inode *dir, struct dentry *dentry, 356 umode_t omode) 357 { 358 int err; 359 struct v9fs_session_info *v9ses; 360 struct p9_fid *fid = NULL, *dfid = NULL; 361 kgid_t gid; 362 const unsigned char *name; 363 umode_t mode; 364 struct inode *inode; 365 struct p9_qid qid; 366 struct posix_acl *dacl = NULL, *pacl = NULL; 367 368 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry); 369 err = 0; 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, 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, 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 truncate_pagecache(inode, iattr->ia_size); 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->i_atime.tv_sec = stat->st_atime_sec; 646 inode->i_atime.tv_nsec = stat->st_atime_nsec; 647 inode->i_mtime.tv_sec = stat->st_mtime_sec; 648 inode->i_mtime.tv_nsec = stat->st_mtime_nsec; 649 inode->i_ctime.tv_sec = stat->st_ctime_sec; 650 inode->i_ctime.tv_nsec = 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 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE)) 660 v9fs_i_size_write(inode, stat->st_size); 661 inode->i_blocks = stat->st_blocks; 662 } else { 663 if (stat->st_result_mask & P9_STATS_ATIME) { 664 inode->i_atime.tv_sec = stat->st_atime_sec; 665 inode->i_atime.tv_nsec = stat->st_atime_nsec; 666 } 667 if (stat->st_result_mask & P9_STATS_MTIME) { 668 inode->i_mtime.tv_sec = stat->st_mtime_sec; 669 inode->i_mtime.tv_nsec = stat->st_mtime_nsec; 670 } 671 if (stat->st_result_mask & P9_STATS_CTIME) { 672 inode->i_ctime.tv_sec = stat->st_ctime_sec; 673 inode->i_ctime.tv_nsec = stat->st_ctime_nsec; 674 } 675 if (stat->st_result_mask & P9_STATS_UID) 676 inode->i_uid = stat->st_uid; 677 if (stat->st_result_mask & P9_STATS_GID) 678 inode->i_gid = stat->st_gid; 679 if (stat->st_result_mask & P9_STATS_NLINK) 680 set_nlink(inode, stat->st_nlink); 681 if (stat->st_result_mask & P9_STATS_MODE) { 682 mode = stat->st_mode & S_IALLUGO; 683 mode |= inode->i_mode & ~S_IALLUGO; 684 inode->i_mode = mode; 685 } 686 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE) && 687 stat->st_result_mask & P9_STATS_SIZE) 688 v9fs_i_size_write(inode, stat->st_size); 689 if (stat->st_result_mask & P9_STATS_BLOCKS) 690 inode->i_blocks = stat->st_blocks; 691 } 692 if (stat->st_result_mask & P9_STATS_GEN) 693 inode->i_generation = stat->st_gen; 694 695 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION 696 * because the inode structure does not have fields for them. 697 */ 698 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR; 699 } 700 701 static int 702 v9fs_vfs_symlink_dotl(struct mnt_idmap *idmap, struct inode *dir, 703 struct dentry *dentry, const char *symname) 704 { 705 int err; 706 kgid_t gid; 707 const unsigned char *name; 708 struct p9_qid qid; 709 struct inode *inode; 710 struct p9_fid *dfid; 711 struct p9_fid *fid = NULL; 712 struct v9fs_session_info *v9ses; 713 714 name = dentry->d_name.name; 715 p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname); 716 v9ses = v9fs_inode2v9ses(dir); 717 718 dfid = v9fs_parent_fid(dentry); 719 if (IS_ERR(dfid)) { 720 err = PTR_ERR(dfid); 721 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 722 return err; 723 } 724 725 gid = v9fs_get_fsgid_for_create(dir); 726 727 /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */ 728 err = p9_client_symlink(dfid, name, symname, gid, &qid); 729 730 if (err < 0) { 731 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err); 732 goto error; 733 } 734 735 v9fs_invalidate_inode_attr(dir); 736 if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) { 737 /* Now walk from the parent so we can get an unopened fid. */ 738 fid = p9_client_walk(dfid, 1, &name, 1); 739 if (IS_ERR(fid)) { 740 err = PTR_ERR(fid); 741 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", 742 err); 743 goto error; 744 } 745 746 /* instantiate inode and assign the unopened fid to dentry */ 747 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 748 if (IS_ERR(inode)) { 749 err = PTR_ERR(inode); 750 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", 751 err); 752 goto error; 753 } 754 v9fs_fid_add(dentry, &fid); 755 d_instantiate(dentry, inode); 756 err = 0; 757 } else { 758 /* Not in cached mode. No need to populate inode with stat */ 759 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0); 760 if (IS_ERR(inode)) { 761 err = PTR_ERR(inode); 762 goto error; 763 } 764 d_instantiate(dentry, inode); 765 } 766 767 error: 768 p9_fid_put(fid); 769 p9_fid_put(dfid); 770 return err; 771 } 772 773 /** 774 * v9fs_vfs_link_dotl - create a hardlink for dotl 775 * @old_dentry: dentry for file to link to 776 * @dir: inode destination for new link 777 * @dentry: dentry for link 778 * 779 */ 780 781 static int 782 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir, 783 struct dentry *dentry) 784 { 785 int err; 786 struct p9_fid *dfid, *oldfid; 787 struct v9fs_session_info *v9ses; 788 789 p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %pd, new_name: %pd\n", 790 dir->i_ino, old_dentry, dentry); 791 792 v9ses = v9fs_inode2v9ses(dir); 793 dfid = v9fs_parent_fid(dentry); 794 if (IS_ERR(dfid)) 795 return PTR_ERR(dfid); 796 797 oldfid = v9fs_fid_lookup(old_dentry); 798 if (IS_ERR(oldfid)) { 799 p9_fid_put(dfid); 800 return PTR_ERR(oldfid); 801 } 802 803 err = p9_client_link(dfid, oldfid, dentry->d_name.name); 804 805 p9_fid_put(dfid); 806 p9_fid_put(oldfid); 807 if (err < 0) { 808 p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err); 809 return err; 810 } 811 812 v9fs_invalidate_inode_attr(dir); 813 if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) { 814 /* Get the latest stat info from server. */ 815 struct p9_fid *fid; 816 817 fid = v9fs_fid_lookup(old_dentry); 818 if (IS_ERR(fid)) 819 return PTR_ERR(fid); 820 821 v9fs_refresh_inode_dotl(fid, d_inode(old_dentry)); 822 p9_fid_put(fid); 823 } 824 ihold(d_inode(old_dentry)); 825 d_instantiate(dentry, d_inode(old_dentry)); 826 827 return err; 828 } 829 830 /** 831 * v9fs_vfs_mknod_dotl - create a special file 832 * @idmap: The idmap of the mount 833 * @dir: inode destination for new link 834 * @dentry: dentry for file 835 * @omode: mode for creation 836 * @rdev: device associated with special file 837 * 838 */ 839 static int 840 v9fs_vfs_mknod_dotl(struct mnt_idmap *idmap, struct inode *dir, 841 struct dentry *dentry, umode_t omode, dev_t rdev) 842 { 843 int err; 844 kgid_t gid; 845 const unsigned char *name; 846 umode_t mode; 847 struct v9fs_session_info *v9ses; 848 struct p9_fid *fid = NULL, *dfid = NULL; 849 struct inode *inode; 850 struct p9_qid qid; 851 struct posix_acl *dacl = NULL, *pacl = NULL; 852 853 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %x MAJOR: %u MINOR: %u\n", 854 dir->i_ino, dentry, omode, 855 MAJOR(rdev), MINOR(rdev)); 856 857 v9ses = v9fs_inode2v9ses(dir); 858 dfid = v9fs_parent_fid(dentry); 859 if (IS_ERR(dfid)) { 860 err = PTR_ERR(dfid); 861 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 862 goto error; 863 } 864 865 gid = v9fs_get_fsgid_for_create(dir); 866 mode = omode; 867 /* Update mode based on ACL value */ 868 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); 869 if (err) { 870 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n", 871 err); 872 goto error; 873 } 874 name = dentry->d_name.name; 875 876 err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid); 877 if (err < 0) 878 goto error; 879 880 v9fs_invalidate_inode_attr(dir); 881 fid = p9_client_walk(dfid, 1, &name, 1); 882 if (IS_ERR(fid)) { 883 err = PTR_ERR(fid); 884 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", 885 err); 886 goto error; 887 } 888 889 /* instantiate inode and assign the unopened fid to the dentry */ 890 if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) { 891 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 892 if (IS_ERR(inode)) { 893 err = PTR_ERR(inode); 894 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", 895 err); 896 goto error; 897 } 898 v9fs_set_create_acl(inode, fid, dacl, pacl); 899 v9fs_fid_add(dentry, &fid); 900 d_instantiate(dentry, inode); 901 err = 0; 902 } else { 903 /* 904 * Not in cached mode. No need to populate inode with stat. 905 * socket syscall returns a fd, so we need instantiate 906 */ 907 inode = v9fs_get_inode(dir->i_sb, mode, rdev); 908 if (IS_ERR(inode)) { 909 err = PTR_ERR(inode); 910 goto error; 911 } 912 v9fs_set_create_acl(inode, fid, dacl, pacl); 913 d_instantiate(dentry, inode); 914 } 915 error: 916 p9_fid_put(fid); 917 v9fs_put_acl(dacl, pacl); 918 p9_fid_put(dfid); 919 920 return err; 921 } 922 923 /** 924 * v9fs_vfs_get_link_dotl - follow a symlink path 925 * @dentry: dentry for symlink 926 * @inode: inode for symlink 927 * @done: destructor for return value 928 */ 929 930 static const char * 931 v9fs_vfs_get_link_dotl(struct dentry *dentry, 932 struct inode *inode, 933 struct delayed_call *done) 934 { 935 struct p9_fid *fid; 936 char *target; 937 int retval; 938 939 if (!dentry) 940 return ERR_PTR(-ECHILD); 941 942 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry); 943 944 fid = v9fs_fid_lookup(dentry); 945 if (IS_ERR(fid)) 946 return ERR_CAST(fid); 947 retval = p9_client_readlink(fid, &target); 948 p9_fid_put(fid); 949 if (retval) 950 return ERR_PTR(retval); 951 set_delayed_call(done, kfree_link, target); 952 return target; 953 } 954 955 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode) 956 { 957 struct p9_stat_dotl *st; 958 struct v9fs_session_info *v9ses; 959 unsigned int flags; 960 961 v9ses = v9fs_inode2v9ses(inode); 962 st = p9_client_getattr_dotl(fid, P9_STATS_ALL); 963 if (IS_ERR(st)) 964 return PTR_ERR(st); 965 /* 966 * Don't update inode if the file type is different 967 */ 968 if (inode_wrong_type(inode, st->st_mode)) 969 goto out; 970 971 /* 972 * We don't want to refresh inode->i_size, 973 * because we may have cached data 974 */ 975 flags = (v9ses->cache & CACHE_LOOSE) ? 976 V9FS_STAT2INODE_KEEP_ISIZE : 0; 977 v9fs_stat2inode_dotl(st, inode, flags); 978 out: 979 kfree(st); 980 return 0; 981 } 982 983 const struct inode_operations v9fs_dir_inode_operations_dotl = { 984 .create = v9fs_vfs_create_dotl, 985 .atomic_open = v9fs_vfs_atomic_open_dotl, 986 .lookup = v9fs_vfs_lookup, 987 .link = v9fs_vfs_link_dotl, 988 .symlink = v9fs_vfs_symlink_dotl, 989 .unlink = v9fs_vfs_unlink, 990 .mkdir = v9fs_vfs_mkdir_dotl, 991 .rmdir = v9fs_vfs_rmdir, 992 .mknod = v9fs_vfs_mknod_dotl, 993 .rename = v9fs_vfs_rename, 994 .getattr = v9fs_vfs_getattr_dotl, 995 .setattr = v9fs_vfs_setattr_dotl, 996 .listxattr = v9fs_listxattr, 997 .get_inode_acl = v9fs_iop_get_inode_acl, 998 .get_acl = v9fs_iop_get_acl, 999 .set_acl = v9fs_iop_set_acl, 1000 }; 1001 1002 const struct inode_operations v9fs_file_inode_operations_dotl = { 1003 .getattr = v9fs_vfs_getattr_dotl, 1004 .setattr = v9fs_vfs_setattr_dotl, 1005 .listxattr = v9fs_listxattr, 1006 .get_inode_acl = v9fs_iop_get_inode_acl, 1007 .get_acl = v9fs_iop_get_acl, 1008 .set_acl = v9fs_iop_set_acl, 1009 }; 1010 1011 const struct inode_operations v9fs_symlink_inode_operations_dotl = { 1012 .get_link = v9fs_vfs_get_link_dotl, 1013 .getattr = v9fs_vfs_getattr_dotl, 1014 .setattr = v9fs_vfs_setattr_dotl, 1015 .listxattr = v9fs_listxattr, 1016 }; 1017