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 if (IS_ERR(fid)) { 300 err = PTR_ERR(fid); 301 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 302 fid = NULL; 303 goto error; 304 } 305 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 306 if (IS_ERR(inode)) { 307 err = PTR_ERR(inode); 308 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err); 309 goto error; 310 } 311 /* Now set the ACL based on the default value */ 312 v9fs_set_create_acl(inode, fid, dacl, pacl); 313 314 v9fs_fid_add(dentry, fid); 315 d_instantiate(dentry, inode); 316 317 v9inode = V9FS_I(inode); 318 mutex_lock(&v9inode->v_mutex); 319 if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) && 320 !v9inode->writeback_fid && 321 ((flags & O_ACCMODE) != O_RDONLY)) { 322 /* 323 * clone a fid and add it to writeback_fid 324 * we do it during open time instead of 325 * page dirty time via write_begin/page_mkwrite 326 * because we want write after unlink usecase 327 * to work. 328 */ 329 inode_fid = v9fs_writeback_fid(dentry); 330 if (IS_ERR(inode_fid)) { 331 err = PTR_ERR(inode_fid); 332 mutex_unlock(&v9inode->v_mutex); 333 goto err_clunk_old_fid; 334 } 335 v9inode->writeback_fid = (void *) inode_fid; 336 } 337 mutex_unlock(&v9inode->v_mutex); 338 /* Since we are opening a file, assign the open fid to the file */ 339 err = finish_open(file, dentry, generic_file_open); 340 if (err) 341 goto err_clunk_old_fid; 342 file->private_data = ofid; 343 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) 344 v9fs_cache_inode_set_cookie(inode, file); 345 file->f_mode |= FMODE_CREATED; 346 out: 347 v9fs_put_acl(dacl, pacl); 348 dput(res); 349 return err; 350 351 error: 352 if (fid) 353 p9_client_clunk(fid); 354 err_clunk_old_fid: 355 if (ofid) 356 p9_client_clunk(ofid); 357 goto out; 358 } 359 360 /** 361 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory 362 * @dir: inode that is being unlinked 363 * @dentry: dentry that is being unlinked 364 * @omode: mode for new directory 365 * 366 */ 367 368 static int v9fs_vfs_mkdir_dotl(struct inode *dir, 369 struct dentry *dentry, umode_t omode) 370 { 371 int err; 372 struct v9fs_session_info *v9ses; 373 struct p9_fid *fid = NULL, *dfid = NULL; 374 kgid_t gid; 375 const unsigned char *name; 376 umode_t mode; 377 struct inode *inode; 378 struct p9_qid qid; 379 struct posix_acl *dacl = NULL, *pacl = NULL; 380 381 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry); 382 err = 0; 383 v9ses = v9fs_inode2v9ses(dir); 384 385 omode |= S_IFDIR; 386 if (dir->i_mode & S_ISGID) 387 omode |= S_ISGID; 388 389 dfid = v9fs_parent_fid(dentry); 390 if (IS_ERR(dfid)) { 391 err = PTR_ERR(dfid); 392 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 393 dfid = NULL; 394 goto error; 395 } 396 397 gid = v9fs_get_fsgid_for_create(dir); 398 mode = omode; 399 /* Update mode based on ACL value */ 400 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); 401 if (err) { 402 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n", 403 err); 404 goto error; 405 } 406 name = dentry->d_name.name; 407 err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid); 408 if (err < 0) 409 goto error; 410 411 fid = p9_client_walk(dfid, 1, &name, 1); 412 if (IS_ERR(fid)) { 413 err = PTR_ERR(fid); 414 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", 415 err); 416 fid = NULL; 417 goto error; 418 } 419 420 /* instantiate inode and assign the unopened fid to the dentry */ 421 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 422 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 423 if (IS_ERR(inode)) { 424 err = PTR_ERR(inode); 425 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", 426 err); 427 goto error; 428 } 429 v9fs_fid_add(dentry, fid); 430 v9fs_set_create_acl(inode, fid, dacl, pacl); 431 d_instantiate(dentry, inode); 432 fid = NULL; 433 err = 0; 434 } else { 435 /* 436 * Not in cached mode. No need to populate 437 * inode with stat. We need to get an inode 438 * so that we can set the acl with dentry 439 */ 440 inode = v9fs_get_inode(dir->i_sb, mode, 0); 441 if (IS_ERR(inode)) { 442 err = PTR_ERR(inode); 443 goto error; 444 } 445 v9fs_set_create_acl(inode, fid, dacl, pacl); 446 d_instantiate(dentry, inode); 447 } 448 inc_nlink(dir); 449 v9fs_invalidate_inode_attr(dir); 450 error: 451 if (fid) 452 p9_client_clunk(fid); 453 v9fs_put_acl(dacl, pacl); 454 return err; 455 } 456 457 static int 458 v9fs_vfs_getattr_dotl(const struct path *path, struct kstat *stat, 459 u32 request_mask, unsigned int flags) 460 { 461 struct dentry *dentry = path->dentry; 462 struct v9fs_session_info *v9ses; 463 struct p9_fid *fid; 464 struct p9_stat_dotl *st; 465 466 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry); 467 v9ses = v9fs_dentry2v9ses(dentry); 468 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 469 generic_fillattr(d_inode(dentry), stat); 470 return 0; 471 } 472 fid = v9fs_fid_lookup(dentry); 473 if (IS_ERR(fid)) 474 return PTR_ERR(fid); 475 476 /* Ask for all the fields in stat structure. Server will return 477 * whatever it supports 478 */ 479 480 st = p9_client_getattr_dotl(fid, P9_STATS_ALL); 481 if (IS_ERR(st)) 482 return PTR_ERR(st); 483 484 v9fs_stat2inode_dotl(st, d_inode(dentry), 0); 485 generic_fillattr(d_inode(dentry), stat); 486 /* Change block size to what the server returned */ 487 stat->blksize = st->st_blksize; 488 489 kfree(st); 490 return 0; 491 } 492 493 /* 494 * Attribute flags. 495 */ 496 #define P9_ATTR_MODE (1 << 0) 497 #define P9_ATTR_UID (1 << 1) 498 #define P9_ATTR_GID (1 << 2) 499 #define P9_ATTR_SIZE (1 << 3) 500 #define P9_ATTR_ATIME (1 << 4) 501 #define P9_ATTR_MTIME (1 << 5) 502 #define P9_ATTR_CTIME (1 << 6) 503 #define P9_ATTR_ATIME_SET (1 << 7) 504 #define P9_ATTR_MTIME_SET (1 << 8) 505 506 struct dotl_iattr_map { 507 int iattr_valid; 508 int p9_iattr_valid; 509 }; 510 511 static int v9fs_mapped_iattr_valid(int iattr_valid) 512 { 513 int i; 514 int p9_iattr_valid = 0; 515 struct dotl_iattr_map dotl_iattr_map[] = { 516 { ATTR_MODE, P9_ATTR_MODE }, 517 { ATTR_UID, P9_ATTR_UID }, 518 { ATTR_GID, P9_ATTR_GID }, 519 { ATTR_SIZE, P9_ATTR_SIZE }, 520 { ATTR_ATIME, P9_ATTR_ATIME }, 521 { ATTR_MTIME, P9_ATTR_MTIME }, 522 { ATTR_CTIME, P9_ATTR_CTIME }, 523 { ATTR_ATIME_SET, P9_ATTR_ATIME_SET }, 524 { ATTR_MTIME_SET, P9_ATTR_MTIME_SET }, 525 }; 526 for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) { 527 if (iattr_valid & dotl_iattr_map[i].iattr_valid) 528 p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid; 529 } 530 return p9_iattr_valid; 531 } 532 533 /** 534 * v9fs_vfs_setattr_dotl - set file metadata 535 * @dentry: file whose metadata to set 536 * @iattr: metadata assignment structure 537 * 538 */ 539 540 int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr) 541 { 542 int retval; 543 struct p9_fid *fid = NULL; 544 struct p9_iattr_dotl p9attr; 545 struct inode *inode = d_inode(dentry); 546 547 p9_debug(P9_DEBUG_VFS, "\n"); 548 549 retval = setattr_prepare(dentry, iattr); 550 if (retval) 551 return retval; 552 553 p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid); 554 p9attr.mode = iattr->ia_mode; 555 p9attr.uid = iattr->ia_uid; 556 p9attr.gid = iattr->ia_gid; 557 p9attr.size = iattr->ia_size; 558 p9attr.atime_sec = iattr->ia_atime.tv_sec; 559 p9attr.atime_nsec = iattr->ia_atime.tv_nsec; 560 p9attr.mtime_sec = iattr->ia_mtime.tv_sec; 561 p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec; 562 563 if (iattr->ia_valid & ATTR_FILE) { 564 fid = iattr->ia_file->private_data; 565 WARN_ON(!fid); 566 } 567 if (!fid) 568 fid = v9fs_fid_lookup(dentry); 569 if (IS_ERR(fid)) 570 return PTR_ERR(fid); 571 572 /* Write all dirty data */ 573 if (S_ISREG(inode->i_mode)) 574 filemap_write_and_wait(inode->i_mapping); 575 576 retval = p9_client_setattr(fid, &p9attr); 577 if (retval < 0) 578 return retval; 579 580 if ((iattr->ia_valid & ATTR_SIZE) && 581 iattr->ia_size != i_size_read(inode)) 582 truncate_setsize(inode, iattr->ia_size); 583 584 v9fs_invalidate_inode_attr(inode); 585 setattr_copy(inode, iattr); 586 mark_inode_dirty(inode); 587 if (iattr->ia_valid & ATTR_MODE) { 588 /* We also want to update ACL when we update mode bits */ 589 retval = v9fs_acl_chmod(inode, fid); 590 if (retval < 0) 591 return retval; 592 } 593 return 0; 594 } 595 596 /** 597 * v9fs_stat2inode_dotl - populate an inode structure with stat info 598 * @stat: stat structure 599 * @inode: inode to populate 600 * @flags: ctrl flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE) 601 * 602 */ 603 604 void 605 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode, 606 unsigned int flags) 607 { 608 umode_t mode; 609 struct v9fs_inode *v9inode = V9FS_I(inode); 610 611 if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) { 612 inode->i_atime.tv_sec = stat->st_atime_sec; 613 inode->i_atime.tv_nsec = stat->st_atime_nsec; 614 inode->i_mtime.tv_sec = stat->st_mtime_sec; 615 inode->i_mtime.tv_nsec = stat->st_mtime_nsec; 616 inode->i_ctime.tv_sec = stat->st_ctime_sec; 617 inode->i_ctime.tv_nsec = stat->st_ctime_nsec; 618 inode->i_uid = stat->st_uid; 619 inode->i_gid = stat->st_gid; 620 set_nlink(inode, stat->st_nlink); 621 622 mode = stat->st_mode & S_IALLUGO; 623 mode |= inode->i_mode & ~S_IALLUGO; 624 inode->i_mode = mode; 625 626 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE)) 627 v9fs_i_size_write(inode, stat->st_size); 628 inode->i_blocks = stat->st_blocks; 629 } else { 630 if (stat->st_result_mask & P9_STATS_ATIME) { 631 inode->i_atime.tv_sec = stat->st_atime_sec; 632 inode->i_atime.tv_nsec = stat->st_atime_nsec; 633 } 634 if (stat->st_result_mask & P9_STATS_MTIME) { 635 inode->i_mtime.tv_sec = stat->st_mtime_sec; 636 inode->i_mtime.tv_nsec = stat->st_mtime_nsec; 637 } 638 if (stat->st_result_mask & P9_STATS_CTIME) { 639 inode->i_ctime.tv_sec = stat->st_ctime_sec; 640 inode->i_ctime.tv_nsec = stat->st_ctime_nsec; 641 } 642 if (stat->st_result_mask & P9_STATS_UID) 643 inode->i_uid = stat->st_uid; 644 if (stat->st_result_mask & P9_STATS_GID) 645 inode->i_gid = stat->st_gid; 646 if (stat->st_result_mask & P9_STATS_NLINK) 647 set_nlink(inode, stat->st_nlink); 648 if (stat->st_result_mask & P9_STATS_MODE) { 649 inode->i_mode = stat->st_mode; 650 if ((S_ISBLK(inode->i_mode)) || 651 (S_ISCHR(inode->i_mode))) 652 init_special_inode(inode, inode->i_mode, 653 inode->i_rdev); 654 } 655 if (stat->st_result_mask & P9_STATS_RDEV) 656 inode->i_rdev = new_decode_dev(stat->st_rdev); 657 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE) && 658 stat->st_result_mask & P9_STATS_SIZE) 659 v9fs_i_size_write(inode, stat->st_size); 660 if (stat->st_result_mask & P9_STATS_BLOCKS) 661 inode->i_blocks = stat->st_blocks; 662 } 663 if (stat->st_result_mask & P9_STATS_GEN) 664 inode->i_generation = stat->st_gen; 665 666 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION 667 * because the inode structure does not have fields for them. 668 */ 669 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR; 670 } 671 672 static int 673 v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry, 674 const char *symname) 675 { 676 int err; 677 kgid_t gid; 678 const unsigned char *name; 679 struct p9_qid qid; 680 struct inode *inode; 681 struct p9_fid *dfid; 682 struct p9_fid *fid = NULL; 683 struct v9fs_session_info *v9ses; 684 685 name = dentry->d_name.name; 686 p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname); 687 v9ses = v9fs_inode2v9ses(dir); 688 689 dfid = v9fs_parent_fid(dentry); 690 if (IS_ERR(dfid)) { 691 err = PTR_ERR(dfid); 692 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 693 return err; 694 } 695 696 gid = v9fs_get_fsgid_for_create(dir); 697 698 /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */ 699 err = p9_client_symlink(dfid, name, symname, gid, &qid); 700 701 if (err < 0) { 702 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err); 703 goto error; 704 } 705 706 v9fs_invalidate_inode_attr(dir); 707 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 708 /* Now walk from the parent so we can get an unopened fid. */ 709 fid = p9_client_walk(dfid, 1, &name, 1); 710 if (IS_ERR(fid)) { 711 err = PTR_ERR(fid); 712 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", 713 err); 714 fid = NULL; 715 goto error; 716 } 717 718 /* instantiate inode and assign the unopened fid to dentry */ 719 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 720 if (IS_ERR(inode)) { 721 err = PTR_ERR(inode); 722 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", 723 err); 724 goto error; 725 } 726 v9fs_fid_add(dentry, fid); 727 d_instantiate(dentry, inode); 728 fid = NULL; 729 err = 0; 730 } else { 731 /* Not in cached mode. No need to populate inode with stat */ 732 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0); 733 if (IS_ERR(inode)) { 734 err = PTR_ERR(inode); 735 goto error; 736 } 737 d_instantiate(dentry, inode); 738 } 739 740 error: 741 if (fid) 742 p9_client_clunk(fid); 743 744 return err; 745 } 746 747 /** 748 * v9fs_vfs_link_dotl - create a hardlink for dotl 749 * @old_dentry: dentry for file to link to 750 * @dir: inode destination for new link 751 * @dentry: dentry for link 752 * 753 */ 754 755 static int 756 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir, 757 struct dentry *dentry) 758 { 759 int err; 760 struct p9_fid *dfid, *oldfid; 761 struct v9fs_session_info *v9ses; 762 763 p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %pd, new_name: %pd\n", 764 dir->i_ino, old_dentry, dentry); 765 766 v9ses = v9fs_inode2v9ses(dir); 767 dfid = v9fs_parent_fid(dentry); 768 if (IS_ERR(dfid)) 769 return PTR_ERR(dfid); 770 771 oldfid = v9fs_fid_lookup(old_dentry); 772 if (IS_ERR(oldfid)) 773 return PTR_ERR(oldfid); 774 775 err = p9_client_link(dfid, oldfid, dentry->d_name.name); 776 777 if (err < 0) { 778 p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err); 779 return err; 780 } 781 782 v9fs_invalidate_inode_attr(dir); 783 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 784 /* Get the latest stat info from server. */ 785 struct p9_fid *fid; 786 fid = v9fs_fid_lookup(old_dentry); 787 if (IS_ERR(fid)) 788 return PTR_ERR(fid); 789 790 v9fs_refresh_inode_dotl(fid, d_inode(old_dentry)); 791 } 792 ihold(d_inode(old_dentry)); 793 d_instantiate(dentry, d_inode(old_dentry)); 794 795 return err; 796 } 797 798 /** 799 * v9fs_vfs_mknod_dotl - create a special file 800 * @dir: inode destination for new link 801 * @dentry: dentry for file 802 * @omode: mode for creation 803 * @rdev: device associated with special file 804 * 805 */ 806 static int 807 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode, 808 dev_t rdev) 809 { 810 int err; 811 kgid_t gid; 812 const unsigned char *name; 813 umode_t mode; 814 struct v9fs_session_info *v9ses; 815 struct p9_fid *fid = NULL, *dfid = NULL; 816 struct inode *inode; 817 struct p9_qid qid; 818 struct posix_acl *dacl = NULL, *pacl = NULL; 819 820 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %hx MAJOR: %u MINOR: %u\n", 821 dir->i_ino, dentry, omode, 822 MAJOR(rdev), MINOR(rdev)); 823 824 v9ses = v9fs_inode2v9ses(dir); 825 dfid = v9fs_parent_fid(dentry); 826 if (IS_ERR(dfid)) { 827 err = PTR_ERR(dfid); 828 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 829 dfid = NULL; 830 goto error; 831 } 832 833 gid = v9fs_get_fsgid_for_create(dir); 834 mode = omode; 835 /* Update mode based on ACL value */ 836 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); 837 if (err) { 838 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n", 839 err); 840 goto error; 841 } 842 name = dentry->d_name.name; 843 844 err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid); 845 if (err < 0) 846 goto error; 847 848 v9fs_invalidate_inode_attr(dir); 849 fid = p9_client_walk(dfid, 1, &name, 1); 850 if (IS_ERR(fid)) { 851 err = PTR_ERR(fid); 852 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", 853 err); 854 fid = NULL; 855 goto error; 856 } 857 858 /* instantiate inode and assign the unopened fid to the dentry */ 859 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 860 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 861 if (IS_ERR(inode)) { 862 err = PTR_ERR(inode); 863 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", 864 err); 865 goto error; 866 } 867 v9fs_set_create_acl(inode, fid, dacl, pacl); 868 v9fs_fid_add(dentry, fid); 869 d_instantiate(dentry, inode); 870 fid = NULL; 871 err = 0; 872 } else { 873 /* 874 * Not in cached mode. No need to populate inode with stat. 875 * socket syscall returns a fd, so we need instantiate 876 */ 877 inode = v9fs_get_inode(dir->i_sb, mode, rdev); 878 if (IS_ERR(inode)) { 879 err = PTR_ERR(inode); 880 goto error; 881 } 882 v9fs_set_create_acl(inode, fid, dacl, pacl); 883 d_instantiate(dentry, inode); 884 } 885 error: 886 if (fid) 887 p9_client_clunk(fid); 888 v9fs_put_acl(dacl, pacl); 889 return err; 890 } 891 892 /** 893 * v9fs_vfs_get_link_dotl - follow a symlink path 894 * @dentry: dentry for symlink 895 * @inode: inode for symlink 896 * @done: destructor for return value 897 */ 898 899 static const char * 900 v9fs_vfs_get_link_dotl(struct dentry *dentry, 901 struct inode *inode, 902 struct delayed_call *done) 903 { 904 struct p9_fid *fid; 905 char *target; 906 int retval; 907 908 if (!dentry) 909 return ERR_PTR(-ECHILD); 910 911 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry); 912 913 fid = v9fs_fid_lookup(dentry); 914 if (IS_ERR(fid)) 915 return ERR_CAST(fid); 916 retval = p9_client_readlink(fid, &target); 917 if (retval) 918 return ERR_PTR(retval); 919 set_delayed_call(done, kfree_link, target); 920 return target; 921 } 922 923 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode) 924 { 925 struct p9_stat_dotl *st; 926 struct v9fs_session_info *v9ses; 927 unsigned int flags; 928 929 v9ses = v9fs_inode2v9ses(inode); 930 st = p9_client_getattr_dotl(fid, P9_STATS_ALL); 931 if (IS_ERR(st)) 932 return PTR_ERR(st); 933 /* 934 * Don't update inode if the file type is different 935 */ 936 if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT)) 937 goto out; 938 939 /* 940 * We don't want to refresh inode->i_size, 941 * because we may have cached data 942 */ 943 flags = (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) ? 944 V9FS_STAT2INODE_KEEP_ISIZE : 0; 945 v9fs_stat2inode_dotl(st, inode, flags); 946 out: 947 kfree(st); 948 return 0; 949 } 950 951 const struct inode_operations v9fs_dir_inode_operations_dotl = { 952 .create = v9fs_vfs_create_dotl, 953 .atomic_open = v9fs_vfs_atomic_open_dotl, 954 .lookup = v9fs_vfs_lookup, 955 .link = v9fs_vfs_link_dotl, 956 .symlink = v9fs_vfs_symlink_dotl, 957 .unlink = v9fs_vfs_unlink, 958 .mkdir = v9fs_vfs_mkdir_dotl, 959 .rmdir = v9fs_vfs_rmdir, 960 .mknod = v9fs_vfs_mknod_dotl, 961 .rename = v9fs_vfs_rename, 962 .getattr = v9fs_vfs_getattr_dotl, 963 .setattr = v9fs_vfs_setattr_dotl, 964 .listxattr = v9fs_listxattr, 965 .get_acl = v9fs_iop_get_acl, 966 }; 967 968 const struct inode_operations v9fs_file_inode_operations_dotl = { 969 .getattr = v9fs_vfs_getattr_dotl, 970 .setattr = v9fs_vfs_setattr_dotl, 971 .listxattr = v9fs_listxattr, 972 .get_acl = v9fs_iop_get_acl, 973 }; 974 975 const struct inode_operations v9fs_symlink_inode_operations_dotl = { 976 .get_link = v9fs_vfs_get_link_dotl, 977 .getattr = v9fs_vfs_getattr_dotl, 978 .setattr = v9fs_vfs_setattr_dotl, 979 .listxattr = v9fs_listxattr, 980 }; 981