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/inet.h> 17 #include <linux/namei.h> 18 #include <linux/idr.h> 19 #include <linux/sched.h> 20 #include <linux/slab.h> 21 #include <linux/xattr.h> 22 #include <linux/posix_acl.h> 23 #include <net/9p/9p.h> 24 #include <net/9p/client.h> 25 26 #include "v9fs.h" 27 #include "v9fs_vfs.h" 28 #include "fid.h" 29 #include "cache.h" 30 #include "xattr.h" 31 #include "acl.h" 32 33 static int 34 v9fs_vfs_mknod_dotl(struct user_namespace *mnt_userns, struct inode *dir, 35 struct dentry *dentry, umode_t omode, dev_t rdev); 36 37 /** 38 * v9fs_get_fsgid_for_create - Helper function to get the gid for a new object 39 * @dir_inode: The directory inode 40 * 41 * Helper function to get the gid for creating a 42 * new file system object. This checks the S_ISGID to determine the owning 43 * group of the new file system object. 44 */ 45 46 static kgid_t v9fs_get_fsgid_for_create(struct inode *dir_inode) 47 { 48 BUG_ON(dir_inode == NULL); 49 50 if (dir_inode->i_mode & S_ISGID) { 51 /* set_gid bit is set.*/ 52 return dir_inode->i_gid; 53 } 54 return current_fsgid(); 55 } 56 57 static int v9fs_test_inode_dotl(struct inode *inode, void *data) 58 { 59 struct v9fs_inode *v9inode = V9FS_I(inode); 60 struct p9_stat_dotl *st = (struct p9_stat_dotl *)data; 61 62 /* don't match inode of different type */ 63 if (inode_wrong_type(inode, st->st_mode)) 64 return 0; 65 66 if (inode->i_generation != st->st_gen) 67 return 0; 68 69 /* compare qid details */ 70 if (memcmp(&v9inode->qid.version, 71 &st->qid.version, sizeof(v9inode->qid.version))) 72 return 0; 73 74 if (v9inode->qid.type != st->qid.type) 75 return 0; 76 77 if (v9inode->qid.path != st->qid.path) 78 return 0; 79 return 1; 80 } 81 82 /* Always get a new inode */ 83 static int v9fs_test_new_inode_dotl(struct inode *inode, void *data) 84 { 85 return 0; 86 } 87 88 static int v9fs_set_inode_dotl(struct inode *inode, void *data) 89 { 90 struct v9fs_inode *v9inode = V9FS_I(inode); 91 struct p9_stat_dotl *st = (struct p9_stat_dotl *)data; 92 93 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid)); 94 inode->i_generation = st->st_gen; 95 return 0; 96 } 97 98 static struct inode *v9fs_qid_iget_dotl(struct super_block *sb, 99 struct p9_qid *qid, 100 struct p9_fid *fid, 101 struct p9_stat_dotl *st, 102 int new) 103 { 104 int retval; 105 unsigned long i_ino; 106 struct inode *inode; 107 struct v9fs_session_info *v9ses = sb->s_fs_info; 108 int (*test)(struct inode *inode, void *data); 109 110 if (new) 111 test = v9fs_test_new_inode_dotl; 112 else 113 test = v9fs_test_inode_dotl; 114 115 i_ino = v9fs_qid2ino(qid); 116 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode_dotl, st); 117 if (!inode) 118 return ERR_PTR(-ENOMEM); 119 if (!(inode->i_state & I_NEW)) 120 return inode; 121 /* 122 * initialize the inode with the stat info 123 * FIXME!! we may need support for stale inodes 124 * later. 125 */ 126 inode->i_ino = i_ino; 127 retval = v9fs_init_inode(v9ses, inode, 128 st->st_mode, new_decode_dev(st->st_rdev)); 129 if (retval) 130 goto error; 131 132 v9fs_stat2inode_dotl(st, inode, 0); 133 v9fs_cache_inode_get_cookie(inode); 134 retval = v9fs_get_acl(inode, fid); 135 if (retval) 136 goto error; 137 138 unlock_new_inode(inode); 139 return inode; 140 error: 141 iget_failed(inode); 142 return ERR_PTR(retval); 143 144 } 145 146 struct inode * 147 v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid, 148 struct super_block *sb, int new) 149 { 150 struct p9_stat_dotl *st; 151 struct inode *inode = NULL; 152 153 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN); 154 if (IS_ERR(st)) 155 return ERR_CAST(st); 156 157 inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st, new); 158 kfree(st); 159 return inode; 160 } 161 162 struct dotl_openflag_map { 163 int open_flag; 164 int dotl_flag; 165 }; 166 167 static int v9fs_mapped_dotl_flags(int flags) 168 { 169 int i; 170 int rflags = 0; 171 struct dotl_openflag_map dotl_oflag_map[] = { 172 { O_CREAT, P9_DOTL_CREATE }, 173 { O_EXCL, P9_DOTL_EXCL }, 174 { O_NOCTTY, P9_DOTL_NOCTTY }, 175 { O_APPEND, P9_DOTL_APPEND }, 176 { O_NONBLOCK, P9_DOTL_NONBLOCK }, 177 { O_DSYNC, P9_DOTL_DSYNC }, 178 { FASYNC, P9_DOTL_FASYNC }, 179 { O_DIRECT, P9_DOTL_DIRECT }, 180 { O_LARGEFILE, P9_DOTL_LARGEFILE }, 181 { O_DIRECTORY, P9_DOTL_DIRECTORY }, 182 { O_NOFOLLOW, P9_DOTL_NOFOLLOW }, 183 { O_NOATIME, P9_DOTL_NOATIME }, 184 { O_CLOEXEC, P9_DOTL_CLOEXEC }, 185 { O_SYNC, P9_DOTL_SYNC}, 186 }; 187 for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) { 188 if (flags & dotl_oflag_map[i].open_flag) 189 rflags |= dotl_oflag_map[i].dotl_flag; 190 } 191 return rflags; 192 } 193 194 /** 195 * v9fs_open_to_dotl_flags- convert Linux specific open flags to 196 * plan 9 open flag. 197 * @flags: flags to convert 198 */ 199 int v9fs_open_to_dotl_flags(int flags) 200 { 201 int rflags = 0; 202 203 /* 204 * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY 205 * and P9_DOTL_NOACCESS 206 */ 207 rflags |= flags & O_ACCMODE; 208 rflags |= v9fs_mapped_dotl_flags(flags); 209 210 return rflags; 211 } 212 213 /** 214 * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol. 215 * @mnt_userns: The user namespace of the mount 216 * @dir: directory inode that is being created 217 * @dentry: dentry that is being deleted 218 * @omode: create permissions 219 * @excl: True if the file must not yet exist 220 * 221 */ 222 static int 223 v9fs_vfs_create_dotl(struct user_namespace *mnt_userns, struct inode *dir, 224 struct dentry *dentry, umode_t omode, bool excl) 225 { 226 return v9fs_vfs_mknod_dotl(mnt_userns, dir, dentry, omode, 0); 227 } 228 229 static int 230 v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry, 231 struct file *file, unsigned int flags, umode_t omode) 232 { 233 int err = 0; 234 kgid_t gid; 235 umode_t mode; 236 const unsigned char *name = NULL; 237 struct p9_qid qid; 238 struct inode *inode; 239 struct p9_fid *fid = NULL; 240 struct v9fs_inode *v9inode; 241 struct p9_fid *dfid = NULL, *ofid = NULL, *inode_fid = NULL; 242 struct v9fs_session_info *v9ses; 243 struct posix_acl *pacl = NULL, *dacl = NULL; 244 struct dentry *res = NULL; 245 246 if (d_in_lookup(dentry)) { 247 res = v9fs_vfs_lookup(dir, dentry, 0); 248 if (IS_ERR(res)) 249 return PTR_ERR(res); 250 251 if (res) 252 dentry = res; 253 } 254 255 /* Only creates */ 256 if (!(flags & O_CREAT) || d_really_is_positive(dentry)) 257 return finish_no_open(file, res); 258 259 v9ses = v9fs_inode2v9ses(dir); 260 261 name = dentry->d_name.name; 262 p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%x\n", 263 name, flags, omode); 264 265 dfid = v9fs_parent_fid(dentry); 266 if (IS_ERR(dfid)) { 267 err = PTR_ERR(dfid); 268 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 269 goto out; 270 } 271 272 /* clone a fid to use for creation */ 273 ofid = clone_fid(dfid); 274 if (IS_ERR(ofid)) { 275 err = PTR_ERR(ofid); 276 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 277 goto out; 278 } 279 280 gid = v9fs_get_fsgid_for_create(dir); 281 282 mode = omode; 283 /* Update mode based on ACL value */ 284 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); 285 if (err) { 286 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in creat %d\n", 287 err); 288 goto out; 289 } 290 err = p9_client_create_dotl(ofid, name, v9fs_open_to_dotl_flags(flags), 291 mode, gid, &qid); 292 if (err < 0) { 293 p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in creat %d\n", 294 err); 295 goto out; 296 } 297 v9fs_invalidate_inode_attr(dir); 298 299 /* instantiate inode and assign the unopened fid to the dentry */ 300 fid = p9_client_walk(dfid, 1, &name, 1); 301 if (IS_ERR(fid)) { 302 err = PTR_ERR(fid); 303 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 304 goto out; 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 out; 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 out; 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 out; 343 file->private_data = ofid; 344 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) 345 fscache_use_cookie(v9fs_inode_cookie(v9inode), 346 file->f_mode & FMODE_WRITE); 347 v9fs_open_fid_add(inode, &ofid); 348 file->f_mode |= FMODE_CREATED; 349 out: 350 p9_fid_put(dfid); 351 p9_fid_put(ofid); 352 p9_fid_put(fid); 353 v9fs_put_acl(dacl, pacl); 354 dput(res); 355 return err; 356 } 357 358 /** 359 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory 360 * @mnt_userns: The user namespace of the mount 361 * @dir: inode that is being unlinked 362 * @dentry: dentry that is being unlinked 363 * @omode: mode for new directory 364 * 365 */ 366 367 static int v9fs_vfs_mkdir_dotl(struct user_namespace *mnt_userns, 368 struct inode *dir, struct dentry *dentry, 369 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 goto error; 394 } 395 396 gid = v9fs_get_fsgid_for_create(dir); 397 mode = omode; 398 /* Update mode based on ACL value */ 399 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); 400 if (err) { 401 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n", 402 err); 403 goto error; 404 } 405 name = dentry->d_name.name; 406 err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid); 407 if (err < 0) 408 goto error; 409 fid = p9_client_walk(dfid, 1, &name, 1); 410 if (IS_ERR(fid)) { 411 err = PTR_ERR(fid); 412 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", 413 err); 414 goto error; 415 } 416 417 /* instantiate inode and assign the unopened fid to the dentry */ 418 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 419 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 420 if (IS_ERR(inode)) { 421 err = PTR_ERR(inode); 422 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", 423 err); 424 goto error; 425 } 426 v9fs_fid_add(dentry, &fid); 427 v9fs_set_create_acl(inode, fid, dacl, pacl); 428 d_instantiate(dentry, inode); 429 err = 0; 430 } else { 431 /* 432 * Not in cached mode. No need to populate 433 * inode with stat. We need to get an inode 434 * so that we can set the acl with dentry 435 */ 436 inode = v9fs_get_inode(dir->i_sb, mode, 0); 437 if (IS_ERR(inode)) { 438 err = PTR_ERR(inode); 439 goto error; 440 } 441 v9fs_set_create_acl(inode, fid, dacl, pacl); 442 d_instantiate(dentry, inode); 443 } 444 inc_nlink(dir); 445 v9fs_invalidate_inode_attr(dir); 446 error: 447 p9_fid_put(fid); 448 v9fs_put_acl(dacl, pacl); 449 p9_fid_put(dfid); 450 return err; 451 } 452 453 static int 454 v9fs_vfs_getattr_dotl(struct user_namespace *mnt_userns, 455 const struct path *path, struct kstat *stat, 456 u32 request_mask, unsigned int flags) 457 { 458 struct dentry *dentry = path->dentry; 459 struct v9fs_session_info *v9ses; 460 struct p9_fid *fid; 461 struct p9_stat_dotl *st; 462 463 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry); 464 v9ses = v9fs_dentry2v9ses(dentry); 465 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 466 generic_fillattr(&init_user_ns, d_inode(dentry), stat); 467 return 0; 468 } 469 fid = v9fs_fid_lookup(dentry); 470 if (IS_ERR(fid)) 471 return PTR_ERR(fid); 472 473 /* Ask for all the fields in stat structure. Server will return 474 * whatever it supports 475 */ 476 477 st = p9_client_getattr_dotl(fid, P9_STATS_ALL); 478 p9_fid_put(fid); 479 if (IS_ERR(st)) 480 return PTR_ERR(st); 481 482 v9fs_stat2inode_dotl(st, d_inode(dentry), 0); 483 generic_fillattr(&init_user_ns, d_inode(dentry), stat); 484 /* Change block size to what the server returned */ 485 stat->blksize = st->st_blksize; 486 487 kfree(st); 488 return 0; 489 } 490 491 /* 492 * Attribute flags. 493 */ 494 #define P9_ATTR_MODE (1 << 0) 495 #define P9_ATTR_UID (1 << 1) 496 #define P9_ATTR_GID (1 << 2) 497 #define P9_ATTR_SIZE (1 << 3) 498 #define P9_ATTR_ATIME (1 << 4) 499 #define P9_ATTR_MTIME (1 << 5) 500 #define P9_ATTR_CTIME (1 << 6) 501 #define P9_ATTR_ATIME_SET (1 << 7) 502 #define P9_ATTR_MTIME_SET (1 << 8) 503 504 struct dotl_iattr_map { 505 int iattr_valid; 506 int p9_iattr_valid; 507 }; 508 509 static int v9fs_mapped_iattr_valid(int iattr_valid) 510 { 511 int i; 512 int p9_iattr_valid = 0; 513 struct dotl_iattr_map dotl_iattr_map[] = { 514 { ATTR_MODE, P9_ATTR_MODE }, 515 { ATTR_UID, P9_ATTR_UID }, 516 { ATTR_GID, P9_ATTR_GID }, 517 { ATTR_SIZE, P9_ATTR_SIZE }, 518 { ATTR_ATIME, P9_ATTR_ATIME }, 519 { ATTR_MTIME, P9_ATTR_MTIME }, 520 { ATTR_CTIME, P9_ATTR_CTIME }, 521 { ATTR_ATIME_SET, P9_ATTR_ATIME_SET }, 522 { ATTR_MTIME_SET, P9_ATTR_MTIME_SET }, 523 }; 524 for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) { 525 if (iattr_valid & dotl_iattr_map[i].iattr_valid) 526 p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid; 527 } 528 return p9_iattr_valid; 529 } 530 531 /** 532 * v9fs_vfs_setattr_dotl - set file metadata 533 * @mnt_userns: The user namespace of the mount 534 * @dentry: file whose metadata to set 535 * @iattr: metadata assignment structure 536 * 537 */ 538 539 int v9fs_vfs_setattr_dotl(struct user_namespace *mnt_userns, 540 struct dentry *dentry, struct iattr *iattr) 541 { 542 int retval, use_dentry = 0; 543 struct p9_fid *fid = NULL; 544 struct p9_iattr_dotl p9attr = { 545 .uid = INVALID_UID, 546 .gid = INVALID_GID, 547 }; 548 struct inode *inode = d_inode(dentry); 549 550 p9_debug(P9_DEBUG_VFS, "\n"); 551 552 retval = setattr_prepare(&init_user_ns, dentry, iattr); 553 if (retval) 554 return retval; 555 556 p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid); 557 if (iattr->ia_valid & ATTR_MODE) 558 p9attr.mode = iattr->ia_mode; 559 if (iattr->ia_valid & ATTR_UID) 560 p9attr.uid = iattr->ia_uid; 561 if (iattr->ia_valid & ATTR_GID) 562 p9attr.gid = iattr->ia_gid; 563 if (iattr->ia_valid & ATTR_SIZE) 564 p9attr.size = iattr->ia_size; 565 if (iattr->ia_valid & ATTR_ATIME_SET) { 566 p9attr.atime_sec = iattr->ia_atime.tv_sec; 567 p9attr.atime_nsec = iattr->ia_atime.tv_nsec; 568 } 569 if (iattr->ia_valid & ATTR_MTIME_SET) { 570 p9attr.mtime_sec = iattr->ia_mtime.tv_sec; 571 p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec; 572 } 573 574 if (iattr->ia_valid & ATTR_FILE) { 575 fid = iattr->ia_file->private_data; 576 WARN_ON(!fid); 577 } 578 if (!fid) { 579 fid = v9fs_fid_lookup(dentry); 580 use_dentry = 1; 581 } 582 if (IS_ERR(fid)) 583 return PTR_ERR(fid); 584 585 /* Write all dirty data */ 586 if (S_ISREG(inode->i_mode)) 587 filemap_write_and_wait(inode->i_mapping); 588 589 retval = p9_client_setattr(fid, &p9attr); 590 if (retval < 0) { 591 if (use_dentry) 592 p9_fid_put(fid); 593 return retval; 594 } 595 596 if ((iattr->ia_valid & ATTR_SIZE) && 597 iattr->ia_size != i_size_read(inode)) 598 truncate_setsize(inode, iattr->ia_size); 599 600 v9fs_invalidate_inode_attr(inode); 601 setattr_copy(&init_user_ns, inode, iattr); 602 mark_inode_dirty(inode); 603 if (iattr->ia_valid & ATTR_MODE) { 604 /* We also want to update ACL when we update mode bits */ 605 retval = v9fs_acl_chmod(inode, fid); 606 if (retval < 0) { 607 if (use_dentry) 608 p9_fid_put(fid); 609 return retval; 610 } 611 } 612 if (use_dentry) 613 p9_fid_put(fid); 614 615 return 0; 616 } 617 618 /** 619 * v9fs_stat2inode_dotl - populate an inode structure with stat info 620 * @stat: stat structure 621 * @inode: inode to populate 622 * @flags: ctrl flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE) 623 * 624 */ 625 626 void 627 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode, 628 unsigned int flags) 629 { 630 umode_t mode; 631 struct v9fs_inode *v9inode = V9FS_I(inode); 632 633 if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) { 634 inode->i_atime.tv_sec = stat->st_atime_sec; 635 inode->i_atime.tv_nsec = stat->st_atime_nsec; 636 inode->i_mtime.tv_sec = stat->st_mtime_sec; 637 inode->i_mtime.tv_nsec = stat->st_mtime_nsec; 638 inode->i_ctime.tv_sec = stat->st_ctime_sec; 639 inode->i_ctime.tv_nsec = stat->st_ctime_nsec; 640 inode->i_uid = stat->st_uid; 641 inode->i_gid = stat->st_gid; 642 set_nlink(inode, stat->st_nlink); 643 644 mode = stat->st_mode & S_IALLUGO; 645 mode |= inode->i_mode & ~S_IALLUGO; 646 inode->i_mode = mode; 647 648 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE)) 649 v9fs_i_size_write(inode, stat->st_size); 650 inode->i_blocks = stat->st_blocks; 651 } else { 652 if (stat->st_result_mask & P9_STATS_ATIME) { 653 inode->i_atime.tv_sec = stat->st_atime_sec; 654 inode->i_atime.tv_nsec = stat->st_atime_nsec; 655 } 656 if (stat->st_result_mask & P9_STATS_MTIME) { 657 inode->i_mtime.tv_sec = stat->st_mtime_sec; 658 inode->i_mtime.tv_nsec = stat->st_mtime_nsec; 659 } 660 if (stat->st_result_mask & P9_STATS_CTIME) { 661 inode->i_ctime.tv_sec = stat->st_ctime_sec; 662 inode->i_ctime.tv_nsec = stat->st_ctime_nsec; 663 } 664 if (stat->st_result_mask & P9_STATS_UID) 665 inode->i_uid = stat->st_uid; 666 if (stat->st_result_mask & P9_STATS_GID) 667 inode->i_gid = stat->st_gid; 668 if (stat->st_result_mask & P9_STATS_NLINK) 669 set_nlink(inode, stat->st_nlink); 670 if (stat->st_result_mask & P9_STATS_MODE) { 671 mode = stat->st_mode & S_IALLUGO; 672 mode |= inode->i_mode & ~S_IALLUGO; 673 inode->i_mode = mode; 674 } 675 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE) && 676 stat->st_result_mask & P9_STATS_SIZE) 677 v9fs_i_size_write(inode, stat->st_size); 678 if (stat->st_result_mask & P9_STATS_BLOCKS) 679 inode->i_blocks = stat->st_blocks; 680 } 681 if (stat->st_result_mask & P9_STATS_GEN) 682 inode->i_generation = stat->st_gen; 683 684 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION 685 * because the inode structure does not have fields for them. 686 */ 687 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR; 688 } 689 690 static int 691 v9fs_vfs_symlink_dotl(struct user_namespace *mnt_userns, struct inode *dir, 692 struct dentry *dentry, const char *symname) 693 { 694 int err; 695 kgid_t gid; 696 const unsigned char *name; 697 struct p9_qid qid; 698 struct inode *inode; 699 struct p9_fid *dfid; 700 struct p9_fid *fid = NULL; 701 struct v9fs_session_info *v9ses; 702 703 name = dentry->d_name.name; 704 p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname); 705 v9ses = v9fs_inode2v9ses(dir); 706 707 dfid = v9fs_parent_fid(dentry); 708 if (IS_ERR(dfid)) { 709 err = PTR_ERR(dfid); 710 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 711 return err; 712 } 713 714 gid = v9fs_get_fsgid_for_create(dir); 715 716 /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */ 717 err = p9_client_symlink(dfid, name, symname, gid, &qid); 718 719 if (err < 0) { 720 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err); 721 goto error; 722 } 723 724 v9fs_invalidate_inode_attr(dir); 725 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 726 /* Now walk from the parent so we can get an unopened fid. */ 727 fid = p9_client_walk(dfid, 1, &name, 1); 728 if (IS_ERR(fid)) { 729 err = PTR_ERR(fid); 730 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", 731 err); 732 goto error; 733 } 734 735 /* instantiate inode and assign the unopened fid to dentry */ 736 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 737 if (IS_ERR(inode)) { 738 err = PTR_ERR(inode); 739 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", 740 err); 741 goto error; 742 } 743 v9fs_fid_add(dentry, &fid); 744 d_instantiate(dentry, inode); 745 err = 0; 746 } else { 747 /* Not in cached mode. No need to populate inode with stat */ 748 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0); 749 if (IS_ERR(inode)) { 750 err = PTR_ERR(inode); 751 goto error; 752 } 753 d_instantiate(dentry, inode); 754 } 755 756 error: 757 p9_fid_put(fid); 758 p9_fid_put(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_fid_put(dfid); 789 return PTR_ERR(oldfid); 790 } 791 792 err = p9_client_link(dfid, oldfid, dentry->d_name.name); 793 794 p9_fid_put(dfid); 795 p9_fid_put(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; 805 806 fid = v9fs_fid_lookup(old_dentry); 807 if (IS_ERR(fid)) 808 return PTR_ERR(fid); 809 810 v9fs_refresh_inode_dotl(fid, d_inode(old_dentry)); 811 p9_fid_put(fid); 812 } 813 ihold(d_inode(old_dentry)); 814 d_instantiate(dentry, d_inode(old_dentry)); 815 816 return err; 817 } 818 819 /** 820 * v9fs_vfs_mknod_dotl - create a special file 821 * @mnt_userns: The user namespace of the mount 822 * @dir: inode destination for new link 823 * @dentry: dentry for file 824 * @omode: mode for creation 825 * @rdev: device associated with special file 826 * 827 */ 828 static int 829 v9fs_vfs_mknod_dotl(struct user_namespace *mnt_userns, struct inode *dir, 830 struct dentry *dentry, umode_t omode, dev_t rdev) 831 { 832 int err; 833 kgid_t gid; 834 const unsigned char *name; 835 umode_t mode; 836 struct v9fs_session_info *v9ses; 837 struct p9_fid *fid = NULL, *dfid = NULL; 838 struct inode *inode; 839 struct p9_qid qid; 840 struct posix_acl *dacl = NULL, *pacl = NULL; 841 842 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %x MAJOR: %u MINOR: %u\n", 843 dir->i_ino, dentry, omode, 844 MAJOR(rdev), MINOR(rdev)); 845 846 v9ses = v9fs_inode2v9ses(dir); 847 dfid = v9fs_parent_fid(dentry); 848 if (IS_ERR(dfid)) { 849 err = PTR_ERR(dfid); 850 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 851 goto error; 852 } 853 854 gid = v9fs_get_fsgid_for_create(dir); 855 mode = omode; 856 /* Update mode based on ACL value */ 857 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); 858 if (err) { 859 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n", 860 err); 861 goto error; 862 } 863 name = dentry->d_name.name; 864 865 err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid); 866 if (err < 0) 867 goto error; 868 869 v9fs_invalidate_inode_attr(dir); 870 fid = p9_client_walk(dfid, 1, &name, 1); 871 if (IS_ERR(fid)) { 872 err = PTR_ERR(fid); 873 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", 874 err); 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 err = 0; 891 } else { 892 /* 893 * Not in cached mode. No need to populate inode with stat. 894 * socket syscall returns a fd, so we need instantiate 895 */ 896 inode = v9fs_get_inode(dir->i_sb, mode, rdev); 897 if (IS_ERR(inode)) { 898 err = PTR_ERR(inode); 899 goto error; 900 } 901 v9fs_set_create_acl(inode, fid, dacl, pacl); 902 d_instantiate(dentry, inode); 903 } 904 error: 905 p9_fid_put(fid); 906 v9fs_put_acl(dacl, pacl); 907 p9_fid_put(dfid); 908 909 return err; 910 } 911 912 /** 913 * v9fs_vfs_get_link_dotl - follow a symlink path 914 * @dentry: dentry for symlink 915 * @inode: inode for symlink 916 * @done: destructor for return value 917 */ 918 919 static const char * 920 v9fs_vfs_get_link_dotl(struct dentry *dentry, 921 struct inode *inode, 922 struct delayed_call *done) 923 { 924 struct p9_fid *fid; 925 char *target; 926 int retval; 927 928 if (!dentry) 929 return ERR_PTR(-ECHILD); 930 931 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry); 932 933 fid = v9fs_fid_lookup(dentry); 934 if (IS_ERR(fid)) 935 return ERR_CAST(fid); 936 retval = p9_client_readlink(fid, &target); 937 p9_fid_put(fid); 938 if (retval) 939 return ERR_PTR(retval); 940 set_delayed_call(done, kfree_link, target); 941 return target; 942 } 943 944 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode) 945 { 946 struct p9_stat_dotl *st; 947 struct v9fs_session_info *v9ses; 948 unsigned int flags; 949 950 v9ses = v9fs_inode2v9ses(inode); 951 st = p9_client_getattr_dotl(fid, P9_STATS_ALL); 952 if (IS_ERR(st)) 953 return PTR_ERR(st); 954 /* 955 * Don't update inode if the file type is different 956 */ 957 if (inode_wrong_type(inode, st->st_mode)) 958 goto out; 959 960 /* 961 * We don't want to refresh inode->i_size, 962 * because we may have cached data 963 */ 964 flags = (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) ? 965 V9FS_STAT2INODE_KEEP_ISIZE : 0; 966 v9fs_stat2inode_dotl(st, inode, flags); 967 out: 968 kfree(st); 969 return 0; 970 } 971 972 const struct inode_operations v9fs_dir_inode_operations_dotl = { 973 .create = v9fs_vfs_create_dotl, 974 .atomic_open = v9fs_vfs_atomic_open_dotl, 975 .lookup = v9fs_vfs_lookup, 976 .link = v9fs_vfs_link_dotl, 977 .symlink = v9fs_vfs_symlink_dotl, 978 .unlink = v9fs_vfs_unlink, 979 .mkdir = v9fs_vfs_mkdir_dotl, 980 .rmdir = v9fs_vfs_rmdir, 981 .mknod = v9fs_vfs_mknod_dotl, 982 .rename = v9fs_vfs_rename, 983 .getattr = v9fs_vfs_getattr_dotl, 984 .setattr = v9fs_vfs_setattr_dotl, 985 .listxattr = v9fs_listxattr, 986 .get_acl = v9fs_iop_get_acl, 987 }; 988 989 const struct inode_operations v9fs_file_inode_operations_dotl = { 990 .getattr = v9fs_vfs_getattr_dotl, 991 .setattr = v9fs_vfs_setattr_dotl, 992 .listxattr = v9fs_listxattr, 993 .get_acl = v9fs_iop_get_acl, 994 }; 995 996 const struct inode_operations v9fs_symlink_inode_operations_dotl = { 997 .get_link = v9fs_vfs_get_link_dotl, 998 .getattr = v9fs_vfs_getattr_dotl, 999 .setattr = v9fs_vfs_setattr_dotl, 1000 .listxattr = v9fs_listxattr, 1001 }; 1002