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 v9fs_open_fid_add(inode, ofid); 346 file->f_mode |= FMODE_CREATED; 347 out: 348 v9fs_put_acl(dacl, pacl); 349 dput(res); 350 return err; 351 352 error: 353 if (fid) 354 p9_client_clunk(fid); 355 err_clunk_old_fid: 356 if (ofid) 357 p9_client_clunk(ofid); 358 goto out; 359 } 360 361 /** 362 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory 363 * @dir: inode that is being unlinked 364 * @dentry: dentry that is being unlinked 365 * @omode: mode for new directory 366 * 367 */ 368 369 static int v9fs_vfs_mkdir_dotl(struct inode *dir, 370 struct dentry *dentry, umode_t omode) 371 { 372 int err; 373 struct v9fs_session_info *v9ses; 374 struct p9_fid *fid = NULL, *dfid = NULL; 375 kgid_t gid; 376 const unsigned char *name; 377 umode_t mode; 378 struct inode *inode; 379 struct p9_qid qid; 380 struct posix_acl *dacl = NULL, *pacl = NULL; 381 382 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry); 383 err = 0; 384 v9ses = v9fs_inode2v9ses(dir); 385 386 omode |= S_IFDIR; 387 if (dir->i_mode & S_ISGID) 388 omode |= S_ISGID; 389 390 dfid = v9fs_parent_fid(dentry); 391 if (IS_ERR(dfid)) { 392 err = PTR_ERR(dfid); 393 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 394 dfid = NULL; 395 goto error; 396 } 397 398 gid = v9fs_get_fsgid_for_create(dir); 399 mode = omode; 400 /* Update mode based on ACL value */ 401 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); 402 if (err) { 403 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n", 404 err); 405 goto error; 406 } 407 name = dentry->d_name.name; 408 err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid); 409 if (err < 0) 410 goto error; 411 412 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 return err; 456 } 457 458 static int 459 v9fs_vfs_getattr_dotl(const struct path *path, struct kstat *stat, 460 u32 request_mask, unsigned int flags) 461 { 462 struct dentry *dentry = path->dentry; 463 struct v9fs_session_info *v9ses; 464 struct p9_fid *fid; 465 struct p9_stat_dotl *st; 466 467 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry); 468 v9ses = v9fs_dentry2v9ses(dentry); 469 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 470 generic_fillattr(d_inode(dentry), stat); 471 return 0; 472 } 473 fid = v9fs_fid_lookup(dentry); 474 if (IS_ERR(fid)) 475 return PTR_ERR(fid); 476 477 /* Ask for all the fields in stat structure. Server will return 478 * whatever it supports 479 */ 480 481 st = p9_client_getattr_dotl(fid, P9_STATS_ALL); 482 if (IS_ERR(st)) 483 return PTR_ERR(st); 484 485 v9fs_stat2inode_dotl(st, d_inode(dentry), 0); 486 generic_fillattr(d_inode(dentry), stat); 487 /* Change block size to what the server returned */ 488 stat->blksize = st->st_blksize; 489 490 kfree(st); 491 return 0; 492 } 493 494 /* 495 * Attribute flags. 496 */ 497 #define P9_ATTR_MODE (1 << 0) 498 #define P9_ATTR_UID (1 << 1) 499 #define P9_ATTR_GID (1 << 2) 500 #define P9_ATTR_SIZE (1 << 3) 501 #define P9_ATTR_ATIME (1 << 4) 502 #define P9_ATTR_MTIME (1 << 5) 503 #define P9_ATTR_CTIME (1 << 6) 504 #define P9_ATTR_ATIME_SET (1 << 7) 505 #define P9_ATTR_MTIME_SET (1 << 8) 506 507 struct dotl_iattr_map { 508 int iattr_valid; 509 int p9_iattr_valid; 510 }; 511 512 static int v9fs_mapped_iattr_valid(int iattr_valid) 513 { 514 int i; 515 int p9_iattr_valid = 0; 516 struct dotl_iattr_map dotl_iattr_map[] = { 517 { ATTR_MODE, P9_ATTR_MODE }, 518 { ATTR_UID, P9_ATTR_UID }, 519 { ATTR_GID, P9_ATTR_GID }, 520 { ATTR_SIZE, P9_ATTR_SIZE }, 521 { ATTR_ATIME, P9_ATTR_ATIME }, 522 { ATTR_MTIME, P9_ATTR_MTIME }, 523 { ATTR_CTIME, P9_ATTR_CTIME }, 524 { ATTR_ATIME_SET, P9_ATTR_ATIME_SET }, 525 { ATTR_MTIME_SET, P9_ATTR_MTIME_SET }, 526 }; 527 for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) { 528 if (iattr_valid & dotl_iattr_map[i].iattr_valid) 529 p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid; 530 } 531 return p9_iattr_valid; 532 } 533 534 /** 535 * v9fs_vfs_setattr_dotl - set file metadata 536 * @dentry: file whose metadata to set 537 * @iattr: metadata assignment structure 538 * 539 */ 540 541 int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr) 542 { 543 int retval; 544 struct p9_fid *fid = NULL; 545 struct p9_iattr_dotl p9attr; 546 struct inode *inode = d_inode(dentry); 547 548 p9_debug(P9_DEBUG_VFS, "\n"); 549 550 retval = setattr_prepare(dentry, iattr); 551 if (retval) 552 return retval; 553 554 p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid); 555 p9attr.mode = iattr->ia_mode; 556 p9attr.uid = iattr->ia_uid; 557 p9attr.gid = iattr->ia_gid; 558 p9attr.size = iattr->ia_size; 559 p9attr.atime_sec = iattr->ia_atime.tv_sec; 560 p9attr.atime_nsec = iattr->ia_atime.tv_nsec; 561 p9attr.mtime_sec = iattr->ia_mtime.tv_sec; 562 p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec; 563 564 if (iattr->ia_valid & ATTR_FILE) { 565 fid = iattr->ia_file->private_data; 566 WARN_ON(!fid); 567 } 568 if (!fid) 569 fid = v9fs_fid_lookup(dentry); 570 if (IS_ERR(fid)) 571 return PTR_ERR(fid); 572 573 /* Write all dirty data */ 574 if (S_ISREG(inode->i_mode)) 575 filemap_write_and_wait(inode->i_mapping); 576 577 retval = p9_client_setattr(fid, &p9attr); 578 if (retval < 0) 579 return retval; 580 581 if ((iattr->ia_valid & ATTR_SIZE) && 582 iattr->ia_size != i_size_read(inode)) 583 truncate_setsize(inode, iattr->ia_size); 584 585 v9fs_invalidate_inode_attr(inode); 586 setattr_copy(inode, iattr); 587 mark_inode_dirty(inode); 588 if (iattr->ia_valid & ATTR_MODE) { 589 /* We also want to update ACL when we update mode bits */ 590 retval = v9fs_acl_chmod(inode, fid); 591 if (retval < 0) 592 return retval; 593 } 594 return 0; 595 } 596 597 /** 598 * v9fs_stat2inode_dotl - populate an inode structure with stat info 599 * @stat: stat structure 600 * @inode: inode to populate 601 * @flags: ctrl flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE) 602 * 603 */ 604 605 void 606 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode, 607 unsigned int flags) 608 { 609 umode_t mode; 610 struct v9fs_inode *v9inode = V9FS_I(inode); 611 612 if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) { 613 inode->i_atime.tv_sec = stat->st_atime_sec; 614 inode->i_atime.tv_nsec = stat->st_atime_nsec; 615 inode->i_mtime.tv_sec = stat->st_mtime_sec; 616 inode->i_mtime.tv_nsec = stat->st_mtime_nsec; 617 inode->i_ctime.tv_sec = stat->st_ctime_sec; 618 inode->i_ctime.tv_nsec = stat->st_ctime_nsec; 619 inode->i_uid = stat->st_uid; 620 inode->i_gid = stat->st_gid; 621 set_nlink(inode, stat->st_nlink); 622 623 mode = stat->st_mode & S_IALLUGO; 624 mode |= inode->i_mode & ~S_IALLUGO; 625 inode->i_mode = mode; 626 627 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE)) 628 v9fs_i_size_write(inode, stat->st_size); 629 inode->i_blocks = stat->st_blocks; 630 } else { 631 if (stat->st_result_mask & P9_STATS_ATIME) { 632 inode->i_atime.tv_sec = stat->st_atime_sec; 633 inode->i_atime.tv_nsec = stat->st_atime_nsec; 634 } 635 if (stat->st_result_mask & P9_STATS_MTIME) { 636 inode->i_mtime.tv_sec = stat->st_mtime_sec; 637 inode->i_mtime.tv_nsec = stat->st_mtime_nsec; 638 } 639 if (stat->st_result_mask & P9_STATS_CTIME) { 640 inode->i_ctime.tv_sec = stat->st_ctime_sec; 641 inode->i_ctime.tv_nsec = stat->st_ctime_nsec; 642 } 643 if (stat->st_result_mask & P9_STATS_UID) 644 inode->i_uid = stat->st_uid; 645 if (stat->st_result_mask & P9_STATS_GID) 646 inode->i_gid = stat->st_gid; 647 if (stat->st_result_mask & P9_STATS_NLINK) 648 set_nlink(inode, stat->st_nlink); 649 if (stat->st_result_mask & P9_STATS_MODE) { 650 inode->i_mode = stat->st_mode; 651 if ((S_ISBLK(inode->i_mode)) || 652 (S_ISCHR(inode->i_mode))) 653 init_special_inode(inode, inode->i_mode, 654 inode->i_rdev); 655 } 656 if (stat->st_result_mask & P9_STATS_RDEV) 657 inode->i_rdev = new_decode_dev(stat->st_rdev); 658 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE) && 659 stat->st_result_mask & P9_STATS_SIZE) 660 v9fs_i_size_write(inode, stat->st_size); 661 if (stat->st_result_mask & P9_STATS_BLOCKS) 662 inode->i_blocks = stat->st_blocks; 663 } 664 if (stat->st_result_mask & P9_STATS_GEN) 665 inode->i_generation = stat->st_gen; 666 667 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION 668 * because the inode structure does not have fields for them. 669 */ 670 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR; 671 } 672 673 static int 674 v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry, 675 const char *symname) 676 { 677 int err; 678 kgid_t gid; 679 const unsigned char *name; 680 struct p9_qid qid; 681 struct inode *inode; 682 struct p9_fid *dfid; 683 struct p9_fid *fid = NULL; 684 struct v9fs_session_info *v9ses; 685 686 name = dentry->d_name.name; 687 p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname); 688 v9ses = v9fs_inode2v9ses(dir); 689 690 dfid = v9fs_parent_fid(dentry); 691 if (IS_ERR(dfid)) { 692 err = PTR_ERR(dfid); 693 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 694 return err; 695 } 696 697 gid = v9fs_get_fsgid_for_create(dir); 698 699 /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */ 700 err = p9_client_symlink(dfid, name, symname, gid, &qid); 701 702 if (err < 0) { 703 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err); 704 goto error; 705 } 706 707 v9fs_invalidate_inode_attr(dir); 708 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 709 /* Now walk from the parent so we can get an unopened fid. */ 710 fid = p9_client_walk(dfid, 1, &name, 1); 711 if (IS_ERR(fid)) { 712 err = PTR_ERR(fid); 713 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", 714 err); 715 fid = NULL; 716 goto error; 717 } 718 719 /* instantiate inode and assign the unopened fid to dentry */ 720 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 721 if (IS_ERR(inode)) { 722 err = PTR_ERR(inode); 723 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", 724 err); 725 goto error; 726 } 727 v9fs_fid_add(dentry, fid); 728 d_instantiate(dentry, inode); 729 fid = NULL; 730 err = 0; 731 } else { 732 /* Not in cached mode. No need to populate inode with stat */ 733 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0); 734 if (IS_ERR(inode)) { 735 err = PTR_ERR(inode); 736 goto error; 737 } 738 d_instantiate(dentry, inode); 739 } 740 741 error: 742 if (fid) 743 p9_client_clunk(fid); 744 745 return err; 746 } 747 748 /** 749 * v9fs_vfs_link_dotl - create a hardlink for dotl 750 * @old_dentry: dentry for file to link to 751 * @dir: inode destination for new link 752 * @dentry: dentry for link 753 * 754 */ 755 756 static int 757 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir, 758 struct dentry *dentry) 759 { 760 int err; 761 struct p9_fid *dfid, *oldfid; 762 struct v9fs_session_info *v9ses; 763 764 p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %pd, new_name: %pd\n", 765 dir->i_ino, old_dentry, dentry); 766 767 v9ses = v9fs_inode2v9ses(dir); 768 dfid = v9fs_parent_fid(dentry); 769 if (IS_ERR(dfid)) 770 return PTR_ERR(dfid); 771 772 oldfid = v9fs_fid_lookup(old_dentry); 773 if (IS_ERR(oldfid)) 774 return PTR_ERR(oldfid); 775 776 err = p9_client_link(dfid, oldfid, dentry->d_name.name); 777 778 if (err < 0) { 779 p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err); 780 return err; 781 } 782 783 v9fs_invalidate_inode_attr(dir); 784 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 785 /* Get the latest stat info from server. */ 786 struct p9_fid *fid; 787 fid = v9fs_fid_lookup(old_dentry); 788 if (IS_ERR(fid)) 789 return PTR_ERR(fid); 790 791 v9fs_refresh_inode_dotl(fid, d_inode(old_dentry)); 792 } 793 ihold(d_inode(old_dentry)); 794 d_instantiate(dentry, d_inode(old_dentry)); 795 796 return err; 797 } 798 799 /** 800 * v9fs_vfs_mknod_dotl - create a special file 801 * @dir: inode destination for new link 802 * @dentry: dentry for file 803 * @omode: mode for creation 804 * @rdev: device associated with special file 805 * 806 */ 807 static int 808 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode, 809 dev_t rdev) 810 { 811 int err; 812 kgid_t gid; 813 const unsigned char *name; 814 umode_t mode; 815 struct v9fs_session_info *v9ses; 816 struct p9_fid *fid = NULL, *dfid = NULL; 817 struct inode *inode; 818 struct p9_qid qid; 819 struct posix_acl *dacl = NULL, *pacl = NULL; 820 821 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %hx MAJOR: %u MINOR: %u\n", 822 dir->i_ino, dentry, omode, 823 MAJOR(rdev), MINOR(rdev)); 824 825 v9ses = v9fs_inode2v9ses(dir); 826 dfid = v9fs_parent_fid(dentry); 827 if (IS_ERR(dfid)) { 828 err = PTR_ERR(dfid); 829 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 830 dfid = NULL; 831 goto error; 832 } 833 834 gid = v9fs_get_fsgid_for_create(dir); 835 mode = omode; 836 /* Update mode based on ACL value */ 837 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); 838 if (err) { 839 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n", 840 err); 841 goto error; 842 } 843 name = dentry->d_name.name; 844 845 err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid); 846 if (err < 0) 847 goto error; 848 849 v9fs_invalidate_inode_attr(dir); 850 fid = p9_client_walk(dfid, 1, &name, 1); 851 if (IS_ERR(fid)) { 852 err = PTR_ERR(fid); 853 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", 854 err); 855 fid = NULL; 856 goto error; 857 } 858 859 /* instantiate inode and assign the unopened fid to the dentry */ 860 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 861 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 862 if (IS_ERR(inode)) { 863 err = PTR_ERR(inode); 864 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", 865 err); 866 goto error; 867 } 868 v9fs_set_create_acl(inode, fid, dacl, pacl); 869 v9fs_fid_add(dentry, fid); 870 d_instantiate(dentry, inode); 871 fid = NULL; 872 err = 0; 873 } else { 874 /* 875 * Not in cached mode. No need to populate inode with stat. 876 * socket syscall returns a fd, so we need instantiate 877 */ 878 inode = v9fs_get_inode(dir->i_sb, mode, rdev); 879 if (IS_ERR(inode)) { 880 err = PTR_ERR(inode); 881 goto error; 882 } 883 v9fs_set_create_acl(inode, fid, dacl, pacl); 884 d_instantiate(dentry, inode); 885 } 886 error: 887 if (fid) 888 p9_client_clunk(fid); 889 v9fs_put_acl(dacl, pacl); 890 return err; 891 } 892 893 /** 894 * v9fs_vfs_get_link_dotl - follow a symlink path 895 * @dentry: dentry for symlink 896 * @inode: inode for symlink 897 * @done: destructor for return value 898 */ 899 900 static const char * 901 v9fs_vfs_get_link_dotl(struct dentry *dentry, 902 struct inode *inode, 903 struct delayed_call *done) 904 { 905 struct p9_fid *fid; 906 char *target; 907 int retval; 908 909 if (!dentry) 910 return ERR_PTR(-ECHILD); 911 912 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry); 913 914 fid = v9fs_fid_lookup(dentry); 915 if (IS_ERR(fid)) 916 return ERR_CAST(fid); 917 retval = p9_client_readlink(fid, &target); 918 if (retval) 919 return ERR_PTR(retval); 920 set_delayed_call(done, kfree_link, target); 921 return target; 922 } 923 924 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode) 925 { 926 struct p9_stat_dotl *st; 927 struct v9fs_session_info *v9ses; 928 unsigned int flags; 929 930 v9ses = v9fs_inode2v9ses(inode); 931 st = p9_client_getattr_dotl(fid, P9_STATS_ALL); 932 if (IS_ERR(st)) 933 return PTR_ERR(st); 934 /* 935 * Don't update inode if the file type is different 936 */ 937 if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT)) 938 goto out; 939 940 /* 941 * We don't want to refresh inode->i_size, 942 * because we may have cached data 943 */ 944 flags = (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) ? 945 V9FS_STAT2INODE_KEEP_ISIZE : 0; 946 v9fs_stat2inode_dotl(st, inode, flags); 947 out: 948 kfree(st); 949 return 0; 950 } 951 952 const struct inode_operations v9fs_dir_inode_operations_dotl = { 953 .create = v9fs_vfs_create_dotl, 954 .atomic_open = v9fs_vfs_atomic_open_dotl, 955 .lookup = v9fs_vfs_lookup, 956 .link = v9fs_vfs_link_dotl, 957 .symlink = v9fs_vfs_symlink_dotl, 958 .unlink = v9fs_vfs_unlink, 959 .mkdir = v9fs_vfs_mkdir_dotl, 960 .rmdir = v9fs_vfs_rmdir, 961 .mknod = v9fs_vfs_mknod_dotl, 962 .rename = v9fs_vfs_rename, 963 .getattr = v9fs_vfs_getattr_dotl, 964 .setattr = v9fs_vfs_setattr_dotl, 965 .listxattr = v9fs_listxattr, 966 .get_acl = v9fs_iop_get_acl, 967 }; 968 969 const struct inode_operations v9fs_file_inode_operations_dotl = { 970 .getattr = v9fs_vfs_getattr_dotl, 971 .setattr = v9fs_vfs_setattr_dotl, 972 .listxattr = v9fs_listxattr, 973 .get_acl = v9fs_iop_get_acl, 974 }; 975 976 const struct inode_operations v9fs_symlink_inode_operations_dotl = { 977 .get_link = v9fs_vfs_get_link_dotl, 978 .getattr = v9fs_vfs_getattr_dotl, 979 .setattr = v9fs_vfs_setattr_dotl, 980 .listxattr = v9fs_listxattr, 981 }; 982