1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * linux/fs/9p/vfs_inode_dotl.c 4 * 5 * This file contains vfs inode ops for the 9P2000.L protocol. 6 * 7 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> 8 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> 9 */ 10 11 #include <linux/module.h> 12 #include <linux/errno.h> 13 #include <linux/fs.h> 14 #include <linux/file.h> 15 #include <linux/pagemap.h> 16 #include <linux/stat.h> 17 #include <linux/string.h> 18 #include <linux/inet.h> 19 #include <linux/namei.h> 20 #include <linux/idr.h> 21 #include <linux/sched.h> 22 #include <linux/slab.h> 23 #include <linux/xattr.h> 24 #include <linux/posix_acl.h> 25 #include <net/9p/9p.h> 26 #include <net/9p/client.h> 27 28 #include "v9fs.h" 29 #include "v9fs_vfs.h" 30 #include "fid.h" 31 #include "cache.h" 32 #include "xattr.h" 33 #include "acl.h" 34 35 static int 36 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode, 37 dev_t rdev); 38 39 /** 40 * v9fs_get_fsgid_for_create - Helper function to get the gid for creating a 41 * new file system object. This checks the S_ISGID to determine the owning 42 * group of the new file system object. 43 */ 44 45 static kgid_t v9fs_get_fsgid_for_create(struct inode *dir_inode) 46 { 47 BUG_ON(dir_inode == NULL); 48 49 if (dir_inode->i_mode & S_ISGID) { 50 /* set_gid bit is set.*/ 51 return dir_inode->i_gid; 52 } 53 return current_fsgid(); 54 } 55 56 static int v9fs_test_inode_dotl(struct inode *inode, void *data) 57 { 58 struct v9fs_inode *v9inode = V9FS_I(inode); 59 struct p9_stat_dotl *st = (struct p9_stat_dotl *)data; 60 61 /* don't match inode of different type */ 62 if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT)) 63 return 0; 64 65 if (inode->i_generation != st->st_gen) 66 return 0; 67 68 /* compare qid details */ 69 if (memcmp(&v9inode->qid.version, 70 &st->qid.version, sizeof(v9inode->qid.version))) 71 return 0; 72 73 if (v9inode->qid.type != st->qid.type) 74 return 0; 75 76 if (v9inode->qid.path != st->qid.path) 77 return 0; 78 return 1; 79 } 80 81 /* Always get a new inode */ 82 static int v9fs_test_new_inode_dotl(struct inode *inode, void *data) 83 { 84 return 0; 85 } 86 87 static int v9fs_set_inode_dotl(struct inode *inode, void *data) 88 { 89 struct v9fs_inode *v9inode = V9FS_I(inode); 90 struct p9_stat_dotl *st = (struct p9_stat_dotl *)data; 91 92 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid)); 93 inode->i_generation = st->st_gen; 94 return 0; 95 } 96 97 static struct inode *v9fs_qid_iget_dotl(struct super_block *sb, 98 struct p9_qid *qid, 99 struct p9_fid *fid, 100 struct p9_stat_dotl *st, 101 int new) 102 { 103 int retval; 104 unsigned long i_ino; 105 struct inode *inode; 106 struct v9fs_session_info *v9ses = sb->s_fs_info; 107 int (*test)(struct inode *, void *); 108 109 if (new) 110 test = v9fs_test_new_inode_dotl; 111 else 112 test = v9fs_test_inode_dotl; 113 114 i_ino = v9fs_qid2ino(qid); 115 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode_dotl, st); 116 if (!inode) 117 return ERR_PTR(-ENOMEM); 118 if (!(inode->i_state & I_NEW)) 119 return inode; 120 /* 121 * initialize the inode with the stat info 122 * FIXME!! we may need support for stale inodes 123 * later. 124 */ 125 inode->i_ino = i_ino; 126 retval = v9fs_init_inode(v9ses, inode, 127 st->st_mode, new_decode_dev(st->st_rdev)); 128 if (retval) 129 goto error; 130 131 v9fs_stat2inode_dotl(st, inode, 0); 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 * @dir: directory inode that is being created 215 * @dentry: dentry that is being deleted 216 * @omode: create permissions 217 * 218 */ 219 220 static int 221 v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, umode_t omode, 222 bool excl) 223 { 224 return v9fs_vfs_mknod_dotl(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 flags, umode_t omode) 230 { 231 int err = 0; 232 kgid_t gid; 233 umode_t mode; 234 const unsigned char *name = NULL; 235 struct p9_qid qid; 236 struct inode *inode; 237 struct p9_fid *fid = NULL; 238 struct v9fs_inode *v9inode; 239 struct p9_fid *dfid, *ofid, *inode_fid; 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%hx\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 creat %d\n", 285 err); 286 goto error; 287 } 288 err = p9_client_create_dotl(ofid, name, v9fs_open_to_dotl_flags(flags), 289 mode, gid, &qid); 290 if (err < 0) { 291 p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in creat %d\n", 292 err); 293 goto error; 294 } 295 v9fs_invalidate_inode_attr(dir); 296 297 /* instantiate inode and assign the unopened fid to the dentry */ 298 fid = p9_client_walk(dfid, 1, &name, 1); 299 p9_client_clunk(dfid); 300 if (IS_ERR(fid)) { 301 err = PTR_ERR(fid); 302 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 303 fid = NULL; 304 goto error; 305 } 306 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 307 if (IS_ERR(inode)) { 308 err = PTR_ERR(inode); 309 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err); 310 goto error; 311 } 312 /* Now set the ACL based on the default value */ 313 v9fs_set_create_acl(inode, fid, dacl, pacl); 314 315 v9fs_fid_add(dentry, fid); 316 d_instantiate(dentry, inode); 317 318 v9inode = V9FS_I(inode); 319 mutex_lock(&v9inode->v_mutex); 320 if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) && 321 !v9inode->writeback_fid && 322 ((flags & O_ACCMODE) != O_RDONLY)) { 323 /* 324 * clone a fid and add it to writeback_fid 325 * we do it during open time instead of 326 * page dirty time via write_begin/page_mkwrite 327 * because we want write after unlink usecase 328 * to work. 329 */ 330 inode_fid = v9fs_writeback_fid(dentry); 331 if (IS_ERR(inode_fid)) { 332 err = PTR_ERR(inode_fid); 333 mutex_unlock(&v9inode->v_mutex); 334 goto err_clunk_old_fid; 335 } 336 v9inode->writeback_fid = (void *) inode_fid; 337 } 338 mutex_unlock(&v9inode->v_mutex); 339 /* Since we are opening a file, assign the open fid to the file */ 340 err = finish_open(file, dentry, generic_file_open); 341 if (err) 342 goto err_clunk_old_fid; 343 file->private_data = ofid; 344 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) 345 v9fs_cache_inode_set_cookie(inode, file); 346 v9fs_open_fid_add(inode, ofid); 347 file->f_mode |= FMODE_CREATED; 348 out: 349 v9fs_put_acl(dacl, pacl); 350 dput(res); 351 return err; 352 353 error: 354 if (fid) 355 p9_client_clunk(fid); 356 err_clunk_old_fid: 357 if (ofid) 358 p9_client_clunk(ofid); 359 goto out; 360 } 361 362 /** 363 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory 364 * @dir: inode that is being unlinked 365 * @dentry: dentry that is being unlinked 366 * @omode: mode for new directory 367 * 368 */ 369 370 static int v9fs_vfs_mkdir_dotl(struct inode *dir, 371 struct dentry *dentry, umode_t omode) 372 { 373 int err; 374 struct v9fs_session_info *v9ses; 375 struct p9_fid *fid = NULL, *dfid = NULL; 376 kgid_t gid; 377 const unsigned char *name; 378 umode_t mode; 379 struct inode *inode; 380 struct p9_qid qid; 381 struct posix_acl *dacl = NULL, *pacl = NULL; 382 383 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry); 384 err = 0; 385 v9ses = v9fs_inode2v9ses(dir); 386 387 omode |= S_IFDIR; 388 if (dir->i_mode & S_ISGID) 389 omode |= S_ISGID; 390 391 dfid = v9fs_parent_fid(dentry); 392 if (IS_ERR(dfid)) { 393 err = PTR_ERR(dfid); 394 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 395 dfid = NULL; 396 goto error; 397 } 398 399 gid = v9fs_get_fsgid_for_create(dir); 400 mode = omode; 401 /* Update mode based on ACL value */ 402 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); 403 if (err) { 404 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n", 405 err); 406 goto error; 407 } 408 name = dentry->d_name.name; 409 err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid); 410 if (err < 0) 411 goto error; 412 fid = p9_client_walk(dfid, 1, &name, 1); 413 if (IS_ERR(fid)) { 414 err = PTR_ERR(fid); 415 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", 416 err); 417 fid = NULL; 418 goto error; 419 } 420 421 /* instantiate inode and assign the unopened fid to the dentry */ 422 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 423 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 424 if (IS_ERR(inode)) { 425 err = PTR_ERR(inode); 426 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", 427 err); 428 goto error; 429 } 430 v9fs_fid_add(dentry, fid); 431 v9fs_set_create_acl(inode, fid, dacl, pacl); 432 d_instantiate(dentry, inode); 433 fid = NULL; 434 err = 0; 435 } else { 436 /* 437 * Not in cached mode. No need to populate 438 * inode with stat. We need to get an inode 439 * so that we can set the acl with dentry 440 */ 441 inode = v9fs_get_inode(dir->i_sb, mode, 0); 442 if (IS_ERR(inode)) { 443 err = PTR_ERR(inode); 444 goto error; 445 } 446 v9fs_set_create_acl(inode, fid, dacl, pacl); 447 d_instantiate(dentry, inode); 448 } 449 inc_nlink(dir); 450 v9fs_invalidate_inode_attr(dir); 451 error: 452 if (fid) 453 p9_client_clunk(fid); 454 v9fs_put_acl(dacl, pacl); 455 p9_client_clunk(dfid); 456 return err; 457 } 458 459 static int 460 v9fs_vfs_getattr_dotl(const struct path *path, struct kstat *stat, 461 u32 request_mask, unsigned int flags) 462 { 463 struct dentry *dentry = path->dentry; 464 struct v9fs_session_info *v9ses; 465 struct p9_fid *fid; 466 struct p9_stat_dotl *st; 467 468 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry); 469 v9ses = v9fs_dentry2v9ses(dentry); 470 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 471 generic_fillattr(d_inode(dentry), stat); 472 return 0; 473 } 474 fid = v9fs_fid_lookup(dentry); 475 if (IS_ERR(fid)) 476 return PTR_ERR(fid); 477 478 /* Ask for all the fields in stat structure. Server will return 479 * whatever it supports 480 */ 481 482 st = p9_client_getattr_dotl(fid, P9_STATS_ALL); 483 p9_client_clunk(fid); 484 if (IS_ERR(st)) 485 return PTR_ERR(st); 486 487 v9fs_stat2inode_dotl(st, d_inode(dentry), 0); 488 generic_fillattr(d_inode(dentry), stat); 489 /* Change block size to what the server returned */ 490 stat->blksize = st->st_blksize; 491 492 kfree(st); 493 return 0; 494 } 495 496 /* 497 * Attribute flags. 498 */ 499 #define P9_ATTR_MODE (1 << 0) 500 #define P9_ATTR_UID (1 << 1) 501 #define P9_ATTR_GID (1 << 2) 502 #define P9_ATTR_SIZE (1 << 3) 503 #define P9_ATTR_ATIME (1 << 4) 504 #define P9_ATTR_MTIME (1 << 5) 505 #define P9_ATTR_CTIME (1 << 6) 506 #define P9_ATTR_ATIME_SET (1 << 7) 507 #define P9_ATTR_MTIME_SET (1 << 8) 508 509 struct dotl_iattr_map { 510 int iattr_valid; 511 int p9_iattr_valid; 512 }; 513 514 static int v9fs_mapped_iattr_valid(int iattr_valid) 515 { 516 int i; 517 int p9_iattr_valid = 0; 518 struct dotl_iattr_map dotl_iattr_map[] = { 519 { ATTR_MODE, P9_ATTR_MODE }, 520 { ATTR_UID, P9_ATTR_UID }, 521 { ATTR_GID, P9_ATTR_GID }, 522 { ATTR_SIZE, P9_ATTR_SIZE }, 523 { ATTR_ATIME, P9_ATTR_ATIME }, 524 { ATTR_MTIME, P9_ATTR_MTIME }, 525 { ATTR_CTIME, P9_ATTR_CTIME }, 526 { ATTR_ATIME_SET, P9_ATTR_ATIME_SET }, 527 { ATTR_MTIME_SET, P9_ATTR_MTIME_SET }, 528 }; 529 for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) { 530 if (iattr_valid & dotl_iattr_map[i].iattr_valid) 531 p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid; 532 } 533 return p9_iattr_valid; 534 } 535 536 /** 537 * v9fs_vfs_setattr_dotl - set file metadata 538 * @dentry: file whose metadata to set 539 * @iattr: metadata assignment structure 540 * 541 */ 542 543 int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr) 544 { 545 int retval, use_dentry = 0; 546 struct p9_fid *fid = NULL; 547 struct p9_iattr_dotl p9attr; 548 struct inode *inode = d_inode(dentry); 549 550 p9_debug(P9_DEBUG_VFS, "\n"); 551 552 retval = setattr_prepare(dentry, iattr); 553 if (retval) 554 return retval; 555 556 p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid); 557 p9attr.mode = iattr->ia_mode; 558 p9attr.uid = iattr->ia_uid; 559 p9attr.gid = iattr->ia_gid; 560 p9attr.size = iattr->ia_size; 561 p9attr.atime_sec = iattr->ia_atime.tv_sec; 562 p9attr.atime_nsec = iattr->ia_atime.tv_nsec; 563 p9attr.mtime_sec = iattr->ia_mtime.tv_sec; 564 p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec; 565 566 if (iattr->ia_valid & ATTR_FILE) { 567 fid = iattr->ia_file->private_data; 568 WARN_ON(!fid); 569 } 570 if (!fid) { 571 fid = v9fs_fid_lookup(dentry); 572 use_dentry = 1; 573 } 574 if (IS_ERR(fid)) 575 return PTR_ERR(fid); 576 577 /* Write all dirty data */ 578 if (S_ISREG(inode->i_mode)) 579 filemap_write_and_wait(inode->i_mapping); 580 581 retval = p9_client_setattr(fid, &p9attr); 582 if (retval < 0) { 583 if (use_dentry) 584 p9_client_clunk(fid); 585 return retval; 586 } 587 588 if ((iattr->ia_valid & ATTR_SIZE) && 589 iattr->ia_size != i_size_read(inode)) 590 truncate_setsize(inode, iattr->ia_size); 591 592 v9fs_invalidate_inode_attr(inode); 593 setattr_copy(inode, iattr); 594 mark_inode_dirty(inode); 595 if (iattr->ia_valid & ATTR_MODE) { 596 /* We also want to update ACL when we update mode bits */ 597 retval = v9fs_acl_chmod(inode, fid); 598 if (retval < 0) { 599 if (use_dentry) 600 p9_client_clunk(fid); 601 return retval; 602 } 603 } 604 if (use_dentry) 605 p9_client_clunk(fid); 606 607 return 0; 608 } 609 610 /** 611 * v9fs_stat2inode_dotl - populate an inode structure with stat info 612 * @stat: stat structure 613 * @inode: inode to populate 614 * @flags: ctrl flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE) 615 * 616 */ 617 618 void 619 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode, 620 unsigned int flags) 621 { 622 umode_t mode; 623 struct v9fs_inode *v9inode = V9FS_I(inode); 624 625 if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) { 626 inode->i_atime.tv_sec = stat->st_atime_sec; 627 inode->i_atime.tv_nsec = stat->st_atime_nsec; 628 inode->i_mtime.tv_sec = stat->st_mtime_sec; 629 inode->i_mtime.tv_nsec = stat->st_mtime_nsec; 630 inode->i_ctime.tv_sec = stat->st_ctime_sec; 631 inode->i_ctime.tv_nsec = stat->st_ctime_nsec; 632 inode->i_uid = stat->st_uid; 633 inode->i_gid = stat->st_gid; 634 set_nlink(inode, stat->st_nlink); 635 636 mode = stat->st_mode & S_IALLUGO; 637 mode |= inode->i_mode & ~S_IALLUGO; 638 inode->i_mode = mode; 639 640 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE)) 641 v9fs_i_size_write(inode, stat->st_size); 642 inode->i_blocks = stat->st_blocks; 643 } else { 644 if (stat->st_result_mask & P9_STATS_ATIME) { 645 inode->i_atime.tv_sec = stat->st_atime_sec; 646 inode->i_atime.tv_nsec = stat->st_atime_nsec; 647 } 648 if (stat->st_result_mask & P9_STATS_MTIME) { 649 inode->i_mtime.tv_sec = stat->st_mtime_sec; 650 inode->i_mtime.tv_nsec = stat->st_mtime_nsec; 651 } 652 if (stat->st_result_mask & P9_STATS_CTIME) { 653 inode->i_ctime.tv_sec = stat->st_ctime_sec; 654 inode->i_ctime.tv_nsec = stat->st_ctime_nsec; 655 } 656 if (stat->st_result_mask & P9_STATS_UID) 657 inode->i_uid = stat->st_uid; 658 if (stat->st_result_mask & P9_STATS_GID) 659 inode->i_gid = stat->st_gid; 660 if (stat->st_result_mask & P9_STATS_NLINK) 661 set_nlink(inode, stat->st_nlink); 662 if (stat->st_result_mask & P9_STATS_MODE) { 663 inode->i_mode = stat->st_mode; 664 if ((S_ISBLK(inode->i_mode)) || 665 (S_ISCHR(inode->i_mode))) 666 init_special_inode(inode, inode->i_mode, 667 inode->i_rdev); 668 } 669 if (stat->st_result_mask & P9_STATS_RDEV) 670 inode->i_rdev = new_decode_dev(stat->st_rdev); 671 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE) && 672 stat->st_result_mask & P9_STATS_SIZE) 673 v9fs_i_size_write(inode, stat->st_size); 674 if (stat->st_result_mask & P9_STATS_BLOCKS) 675 inode->i_blocks = stat->st_blocks; 676 } 677 if (stat->st_result_mask & P9_STATS_GEN) 678 inode->i_generation = stat->st_gen; 679 680 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION 681 * because the inode structure does not have fields for them. 682 */ 683 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR; 684 } 685 686 static int 687 v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry, 688 const char *symname) 689 { 690 int err; 691 kgid_t gid; 692 const unsigned char *name; 693 struct p9_qid qid; 694 struct inode *inode; 695 struct p9_fid *dfid; 696 struct p9_fid *fid = NULL; 697 struct v9fs_session_info *v9ses; 698 699 name = dentry->d_name.name; 700 p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname); 701 v9ses = v9fs_inode2v9ses(dir); 702 703 dfid = v9fs_parent_fid(dentry); 704 if (IS_ERR(dfid)) { 705 err = PTR_ERR(dfid); 706 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 707 return err; 708 } 709 710 gid = v9fs_get_fsgid_for_create(dir); 711 712 /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */ 713 err = p9_client_symlink(dfid, name, symname, gid, &qid); 714 715 if (err < 0) { 716 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err); 717 goto error; 718 } 719 720 v9fs_invalidate_inode_attr(dir); 721 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 722 /* Now walk from the parent so we can get an unopened fid. */ 723 fid = p9_client_walk(dfid, 1, &name, 1); 724 if (IS_ERR(fid)) { 725 err = PTR_ERR(fid); 726 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", 727 err); 728 fid = NULL; 729 goto error; 730 } 731 732 /* instantiate inode and assign the unopened fid to dentry */ 733 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 734 if (IS_ERR(inode)) { 735 err = PTR_ERR(inode); 736 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", 737 err); 738 goto error; 739 } 740 v9fs_fid_add(dentry, fid); 741 d_instantiate(dentry, inode); 742 fid = NULL; 743 err = 0; 744 } else { 745 /* Not in cached mode. No need to populate inode with stat */ 746 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0); 747 if (IS_ERR(inode)) { 748 err = PTR_ERR(inode); 749 goto error; 750 } 751 d_instantiate(dentry, inode); 752 } 753 754 error: 755 if (fid) 756 p9_client_clunk(fid); 757 758 p9_client_clunk(dfid); 759 return err; 760 } 761 762 /** 763 * v9fs_vfs_link_dotl - create a hardlink for dotl 764 * @old_dentry: dentry for file to link to 765 * @dir: inode destination for new link 766 * @dentry: dentry for link 767 * 768 */ 769 770 static int 771 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir, 772 struct dentry *dentry) 773 { 774 int err; 775 struct p9_fid *dfid, *oldfid; 776 struct v9fs_session_info *v9ses; 777 778 p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %pd, new_name: %pd\n", 779 dir->i_ino, old_dentry, dentry); 780 781 v9ses = v9fs_inode2v9ses(dir); 782 dfid = v9fs_parent_fid(dentry); 783 if (IS_ERR(dfid)) 784 return PTR_ERR(dfid); 785 786 oldfid = v9fs_fid_lookup(old_dentry); 787 if (IS_ERR(oldfid)) { 788 p9_client_clunk(dfid); 789 return PTR_ERR(oldfid); 790 } 791 792 err = p9_client_link(dfid, oldfid, dentry->d_name.name); 793 794 p9_client_clunk(dfid); 795 p9_client_clunk(oldfid); 796 if (err < 0) { 797 p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err); 798 return err; 799 } 800 801 v9fs_invalidate_inode_attr(dir); 802 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 803 /* Get the latest stat info from server. */ 804 struct p9_fid *fid; 805 fid = v9fs_fid_lookup(old_dentry); 806 if (IS_ERR(fid)) 807 return PTR_ERR(fid); 808 809 v9fs_refresh_inode_dotl(fid, d_inode(old_dentry)); 810 p9_client_clunk(fid); 811 } 812 ihold(d_inode(old_dentry)); 813 d_instantiate(dentry, d_inode(old_dentry)); 814 815 return err; 816 } 817 818 /** 819 * v9fs_vfs_mknod_dotl - create a special file 820 * @dir: inode destination for new link 821 * @dentry: dentry for file 822 * @omode: mode for creation 823 * @rdev: device associated with special file 824 * 825 */ 826 static int 827 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode, 828 dev_t rdev) 829 { 830 int err; 831 kgid_t gid; 832 const unsigned char *name; 833 umode_t mode; 834 struct v9fs_session_info *v9ses; 835 struct p9_fid *fid = NULL, *dfid = NULL; 836 struct inode *inode; 837 struct p9_qid qid; 838 struct posix_acl *dacl = NULL, *pacl = NULL; 839 840 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %hx MAJOR: %u MINOR: %u\n", 841 dir->i_ino, dentry, omode, 842 MAJOR(rdev), MINOR(rdev)); 843 844 v9ses = v9fs_inode2v9ses(dir); 845 dfid = v9fs_parent_fid(dentry); 846 if (IS_ERR(dfid)) { 847 err = PTR_ERR(dfid); 848 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 849 dfid = NULL; 850 goto error; 851 } 852 853 gid = v9fs_get_fsgid_for_create(dir); 854 mode = omode; 855 /* Update mode based on ACL value */ 856 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); 857 if (err) { 858 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n", 859 err); 860 goto error; 861 } 862 name = dentry->d_name.name; 863 864 err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid); 865 if (err < 0) 866 goto error; 867 868 v9fs_invalidate_inode_attr(dir); 869 fid = p9_client_walk(dfid, 1, &name, 1); 870 if (IS_ERR(fid)) { 871 err = PTR_ERR(fid); 872 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", 873 err); 874 fid = NULL; 875 goto error; 876 } 877 878 /* instantiate inode and assign the unopened fid to the dentry */ 879 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 880 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 881 if (IS_ERR(inode)) { 882 err = PTR_ERR(inode); 883 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", 884 err); 885 goto error; 886 } 887 v9fs_set_create_acl(inode, fid, dacl, pacl); 888 v9fs_fid_add(dentry, fid); 889 d_instantiate(dentry, inode); 890 fid = NULL; 891 err = 0; 892 } else { 893 /* 894 * Not in cached mode. No need to populate inode with stat. 895 * socket syscall returns a fd, so we need instantiate 896 */ 897 inode = v9fs_get_inode(dir->i_sb, mode, rdev); 898 if (IS_ERR(inode)) { 899 err = PTR_ERR(inode); 900 goto error; 901 } 902 v9fs_set_create_acl(inode, fid, dacl, pacl); 903 d_instantiate(dentry, inode); 904 } 905 error: 906 if (fid) 907 p9_client_clunk(fid); 908 v9fs_put_acl(dacl, pacl); 909 p9_client_clunk(dfid); 910 911 return err; 912 } 913 914 /** 915 * v9fs_vfs_get_link_dotl - follow a symlink path 916 * @dentry: dentry for symlink 917 * @inode: inode for symlink 918 * @done: destructor for return value 919 */ 920 921 static const char * 922 v9fs_vfs_get_link_dotl(struct dentry *dentry, 923 struct inode *inode, 924 struct delayed_call *done) 925 { 926 struct p9_fid *fid; 927 char *target; 928 int retval; 929 930 if (!dentry) 931 return ERR_PTR(-ECHILD); 932 933 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry); 934 935 fid = v9fs_fid_lookup(dentry); 936 if (IS_ERR(fid)) 937 return ERR_CAST(fid); 938 retval = p9_client_readlink(fid, &target); 939 p9_client_clunk(fid); 940 if (retval) 941 return ERR_PTR(retval); 942 set_delayed_call(done, kfree_link, target); 943 return target; 944 } 945 946 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode) 947 { 948 struct p9_stat_dotl *st; 949 struct v9fs_session_info *v9ses; 950 unsigned int flags; 951 952 v9ses = v9fs_inode2v9ses(inode); 953 st = p9_client_getattr_dotl(fid, P9_STATS_ALL); 954 if (IS_ERR(st)) 955 return PTR_ERR(st); 956 /* 957 * Don't update inode if the file type is different 958 */ 959 if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT)) 960 goto out; 961 962 /* 963 * We don't want to refresh inode->i_size, 964 * because we may have cached data 965 */ 966 flags = (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) ? 967 V9FS_STAT2INODE_KEEP_ISIZE : 0; 968 v9fs_stat2inode_dotl(st, inode, flags); 969 out: 970 kfree(st); 971 return 0; 972 } 973 974 const struct inode_operations v9fs_dir_inode_operations_dotl = { 975 .create = v9fs_vfs_create_dotl, 976 .atomic_open = v9fs_vfs_atomic_open_dotl, 977 .lookup = v9fs_vfs_lookup, 978 .link = v9fs_vfs_link_dotl, 979 .symlink = v9fs_vfs_symlink_dotl, 980 .unlink = v9fs_vfs_unlink, 981 .mkdir = v9fs_vfs_mkdir_dotl, 982 .rmdir = v9fs_vfs_rmdir, 983 .mknod = v9fs_vfs_mknod_dotl, 984 .rename = v9fs_vfs_rename, 985 .getattr = v9fs_vfs_getattr_dotl, 986 .setattr = v9fs_vfs_setattr_dotl, 987 .listxattr = v9fs_listxattr, 988 .get_acl = v9fs_iop_get_acl, 989 }; 990 991 const struct inode_operations v9fs_file_inode_operations_dotl = { 992 .getattr = v9fs_vfs_getattr_dotl, 993 .setattr = v9fs_vfs_setattr_dotl, 994 .listxattr = v9fs_listxattr, 995 .get_acl = v9fs_iop_get_acl, 996 }; 997 998 const struct inode_operations v9fs_symlink_inode_operations_dotl = { 999 .get_link = v9fs_vfs_get_link_dotl, 1000 .getattr = v9fs_vfs_getattr_dotl, 1001 .setattr = v9fs_vfs_setattr_dotl, 1002 .listxattr = v9fs_listxattr, 1003 }; 1004