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 user_namespace *mnt_userns, struct inode *dir, 37 struct dentry *dentry, umode_t omode, dev_t rdev); 38 39 /** 40 * v9fs_get_fsgid_for_create - Helper function to get the gid for a new object 41 * @dir_inode: The directory inode 42 * 43 * Helper function to get the gid for creating a 44 * new file system object. This checks the S_ISGID to determine the owning 45 * group of the new file system object. 46 */ 47 48 static kgid_t v9fs_get_fsgid_for_create(struct inode *dir_inode) 49 { 50 BUG_ON(dir_inode == NULL); 51 52 if (dir_inode->i_mode & S_ISGID) { 53 /* set_gid bit is set.*/ 54 return dir_inode->i_gid; 55 } 56 return current_fsgid(); 57 } 58 59 static int v9fs_test_inode_dotl(struct inode *inode, void *data) 60 { 61 struct v9fs_inode *v9inode = V9FS_I(inode); 62 struct p9_stat_dotl *st = (struct p9_stat_dotl *)data; 63 64 /* don't match inode of different type */ 65 if (inode_wrong_type(inode, st->st_mode)) 66 return 0; 67 68 if (inode->i_generation != st->st_gen) 69 return 0; 70 71 /* compare qid details */ 72 if (memcmp(&v9inode->qid.version, 73 &st->qid.version, sizeof(v9inode->qid.version))) 74 return 0; 75 76 if (v9inode->qid.type != st->qid.type) 77 return 0; 78 79 if (v9inode->qid.path != st->qid.path) 80 return 0; 81 return 1; 82 } 83 84 /* Always get a new inode */ 85 static int v9fs_test_new_inode_dotl(struct inode *inode, void *data) 86 { 87 return 0; 88 } 89 90 static int v9fs_set_inode_dotl(struct inode *inode, void *data) 91 { 92 struct v9fs_inode *v9inode = V9FS_I(inode); 93 struct p9_stat_dotl *st = (struct p9_stat_dotl *)data; 94 95 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid)); 96 inode->i_generation = st->st_gen; 97 return 0; 98 } 99 100 static struct inode *v9fs_qid_iget_dotl(struct super_block *sb, 101 struct p9_qid *qid, 102 struct p9_fid *fid, 103 struct p9_stat_dotl *st, 104 int new) 105 { 106 int retval; 107 unsigned long i_ino; 108 struct inode *inode; 109 struct v9fs_session_info *v9ses = sb->s_fs_info; 110 int (*test)(struct inode *, void *); 111 112 if (new) 113 test = v9fs_test_new_inode_dotl; 114 else 115 test = v9fs_test_inode_dotl; 116 117 i_ino = v9fs_qid2ino(qid); 118 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode_dotl, st); 119 if (!inode) 120 return ERR_PTR(-ENOMEM); 121 if (!(inode->i_state & I_NEW)) 122 return inode; 123 /* 124 * initialize the inode with the stat info 125 * FIXME!! we may need support for stale inodes 126 * later. 127 */ 128 inode->i_ino = i_ino; 129 retval = v9fs_init_inode(v9ses, inode, 130 st->st_mode, new_decode_dev(st->st_rdev)); 131 if (retval) 132 goto error; 133 134 v9fs_stat2inode_dotl(st, inode, 0); 135 v9fs_cache_inode_get_cookie(inode); 136 retval = v9fs_get_acl(inode, fid); 137 if (retval) 138 goto error; 139 140 unlock_new_inode(inode); 141 return inode; 142 error: 143 iget_failed(inode); 144 return ERR_PTR(retval); 145 146 } 147 148 struct inode * 149 v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid, 150 struct super_block *sb, int new) 151 { 152 struct p9_stat_dotl *st; 153 struct inode *inode = NULL; 154 155 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN); 156 if (IS_ERR(st)) 157 return ERR_CAST(st); 158 159 inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st, new); 160 kfree(st); 161 return inode; 162 } 163 164 struct dotl_openflag_map { 165 int open_flag; 166 int dotl_flag; 167 }; 168 169 static int v9fs_mapped_dotl_flags(int flags) 170 { 171 int i; 172 int rflags = 0; 173 struct dotl_openflag_map dotl_oflag_map[] = { 174 { O_CREAT, P9_DOTL_CREATE }, 175 { O_EXCL, P9_DOTL_EXCL }, 176 { O_NOCTTY, P9_DOTL_NOCTTY }, 177 { O_APPEND, P9_DOTL_APPEND }, 178 { O_NONBLOCK, P9_DOTL_NONBLOCK }, 179 { O_DSYNC, P9_DOTL_DSYNC }, 180 { FASYNC, P9_DOTL_FASYNC }, 181 { O_DIRECT, P9_DOTL_DIRECT }, 182 { O_LARGEFILE, P9_DOTL_LARGEFILE }, 183 { O_DIRECTORY, P9_DOTL_DIRECTORY }, 184 { O_NOFOLLOW, P9_DOTL_NOFOLLOW }, 185 { O_NOATIME, P9_DOTL_NOATIME }, 186 { O_CLOEXEC, P9_DOTL_CLOEXEC }, 187 { O_SYNC, P9_DOTL_SYNC}, 188 }; 189 for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) { 190 if (flags & dotl_oflag_map[i].open_flag) 191 rflags |= dotl_oflag_map[i].dotl_flag; 192 } 193 return rflags; 194 } 195 196 /** 197 * v9fs_open_to_dotl_flags- convert Linux specific open flags to 198 * plan 9 open flag. 199 * @flags: flags to convert 200 */ 201 int v9fs_open_to_dotl_flags(int flags) 202 { 203 int rflags = 0; 204 205 /* 206 * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY 207 * and P9_DOTL_NOACCESS 208 */ 209 rflags |= flags & O_ACCMODE; 210 rflags |= v9fs_mapped_dotl_flags(flags); 211 212 return rflags; 213 } 214 215 /** 216 * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol. 217 * @mnt_userns: The user namespace of the mount 218 * @dir: directory inode that is being created 219 * @dentry: dentry that is being deleted 220 * @omode: create permissions 221 * @excl: True if the file must not yet exist 222 * 223 */ 224 static int 225 v9fs_vfs_create_dotl(struct user_namespace *mnt_userns, struct inode *dir, 226 struct dentry *dentry, umode_t omode, bool excl) 227 { 228 return v9fs_vfs_mknod_dotl(mnt_userns, dir, dentry, omode, 0); 229 } 230 231 static int 232 v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry, 233 struct file *file, unsigned flags, umode_t omode) 234 { 235 int err = 0; 236 kgid_t gid; 237 umode_t mode; 238 const unsigned char *name = NULL; 239 struct p9_qid qid; 240 struct inode *inode; 241 struct p9_fid *fid = NULL; 242 struct v9fs_inode *v9inode; 243 struct p9_fid *dfid, *ofid, *inode_fid; 244 struct v9fs_session_info *v9ses; 245 struct posix_acl *pacl = NULL, *dacl = NULL; 246 struct dentry *res = NULL; 247 248 if (d_in_lookup(dentry)) { 249 res = v9fs_vfs_lookup(dir, dentry, 0); 250 if (IS_ERR(res)) 251 return PTR_ERR(res); 252 253 if (res) 254 dentry = res; 255 } 256 257 /* Only creates */ 258 if (!(flags & O_CREAT) || d_really_is_positive(dentry)) 259 return finish_no_open(file, res); 260 261 v9ses = v9fs_inode2v9ses(dir); 262 263 name = dentry->d_name.name; 264 p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%hx\n", 265 name, flags, omode); 266 267 dfid = v9fs_parent_fid(dentry); 268 if (IS_ERR(dfid)) { 269 err = PTR_ERR(dfid); 270 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 271 goto out; 272 } 273 274 /* clone a fid to use for creation */ 275 ofid = clone_fid(dfid); 276 if (IS_ERR(ofid)) { 277 err = PTR_ERR(ofid); 278 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 279 goto out; 280 } 281 282 gid = v9fs_get_fsgid_for_create(dir); 283 284 mode = omode; 285 /* Update mode based on ACL value */ 286 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); 287 if (err) { 288 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in creat %d\n", 289 err); 290 goto error; 291 } 292 err = p9_client_create_dotl(ofid, name, v9fs_open_to_dotl_flags(flags), 293 mode, gid, &qid); 294 if (err < 0) { 295 p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in creat %d\n", 296 err); 297 goto error; 298 } 299 v9fs_invalidate_inode_attr(dir); 300 301 /* instantiate inode and assign the unopened fid to the dentry */ 302 fid = p9_client_walk(dfid, 1, &name, 1); 303 p9_client_clunk(dfid); 304 if (IS_ERR(fid)) { 305 err = PTR_ERR(fid); 306 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 307 fid = NULL; 308 goto error; 309 } 310 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 311 if (IS_ERR(inode)) { 312 err = PTR_ERR(inode); 313 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err); 314 goto error; 315 } 316 /* Now set the ACL based on the default value */ 317 v9fs_set_create_acl(inode, fid, dacl, pacl); 318 319 v9fs_fid_add(dentry, fid); 320 d_instantiate(dentry, inode); 321 322 v9inode = V9FS_I(inode); 323 mutex_lock(&v9inode->v_mutex); 324 if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) && 325 !v9inode->writeback_fid && 326 ((flags & O_ACCMODE) != O_RDONLY)) { 327 /* 328 * clone a fid and add it to writeback_fid 329 * we do it during open time instead of 330 * page dirty time via write_begin/page_mkwrite 331 * because we want write after unlink usecase 332 * to work. 333 */ 334 inode_fid = v9fs_writeback_fid(dentry); 335 if (IS_ERR(inode_fid)) { 336 err = PTR_ERR(inode_fid); 337 mutex_unlock(&v9inode->v_mutex); 338 goto err_clunk_old_fid; 339 } 340 v9inode->writeback_fid = (void *) inode_fid; 341 } 342 mutex_unlock(&v9inode->v_mutex); 343 /* Since we are opening a file, assign the open fid to the file */ 344 err = finish_open(file, dentry, generic_file_open); 345 if (err) 346 goto err_clunk_old_fid; 347 file->private_data = ofid; 348 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) 349 v9fs_cache_inode_set_cookie(inode, file); 350 v9fs_open_fid_add(inode, ofid); 351 file->f_mode |= FMODE_CREATED; 352 out: 353 v9fs_put_acl(dacl, pacl); 354 dput(res); 355 return err; 356 357 error: 358 if (fid) 359 p9_client_clunk(fid); 360 err_clunk_old_fid: 361 if (ofid) 362 p9_client_clunk(ofid); 363 goto out; 364 } 365 366 /** 367 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory 368 * @mnt_userns: The user namespace of the mount 369 * @dir: inode that is being unlinked 370 * @dentry: dentry that is being unlinked 371 * @omode: mode for new directory 372 * 373 */ 374 375 static int v9fs_vfs_mkdir_dotl(struct user_namespace *mnt_userns, 376 struct inode *dir, struct dentry *dentry, 377 umode_t omode) 378 { 379 int err; 380 struct v9fs_session_info *v9ses; 381 struct p9_fid *fid = NULL, *dfid = NULL; 382 kgid_t gid; 383 const unsigned char *name; 384 umode_t mode; 385 struct inode *inode; 386 struct p9_qid qid; 387 struct posix_acl *dacl = NULL, *pacl = NULL; 388 389 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry); 390 err = 0; 391 v9ses = v9fs_inode2v9ses(dir); 392 393 omode |= S_IFDIR; 394 if (dir->i_mode & S_ISGID) 395 omode |= S_ISGID; 396 397 dfid = v9fs_parent_fid(dentry); 398 if (IS_ERR(dfid)) { 399 err = PTR_ERR(dfid); 400 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 401 dfid = NULL; 402 goto error; 403 } 404 405 gid = v9fs_get_fsgid_for_create(dir); 406 mode = omode; 407 /* Update mode based on ACL value */ 408 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); 409 if (err) { 410 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n", 411 err); 412 goto error; 413 } 414 name = dentry->d_name.name; 415 err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid); 416 if (err < 0) 417 goto error; 418 fid = p9_client_walk(dfid, 1, &name, 1); 419 if (IS_ERR(fid)) { 420 err = PTR_ERR(fid); 421 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", 422 err); 423 fid = NULL; 424 goto error; 425 } 426 427 /* instantiate inode and assign the unopened fid to the dentry */ 428 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 429 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 430 if (IS_ERR(inode)) { 431 err = PTR_ERR(inode); 432 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", 433 err); 434 goto error; 435 } 436 v9fs_fid_add(dentry, fid); 437 v9fs_set_create_acl(inode, fid, dacl, pacl); 438 d_instantiate(dentry, inode); 439 fid = NULL; 440 err = 0; 441 } else { 442 /* 443 * Not in cached mode. No need to populate 444 * inode with stat. We need to get an inode 445 * so that we can set the acl with dentry 446 */ 447 inode = v9fs_get_inode(dir->i_sb, mode, 0); 448 if (IS_ERR(inode)) { 449 err = PTR_ERR(inode); 450 goto error; 451 } 452 v9fs_set_create_acl(inode, fid, dacl, pacl); 453 d_instantiate(dentry, inode); 454 } 455 inc_nlink(dir); 456 v9fs_invalidate_inode_attr(dir); 457 error: 458 if (fid) 459 p9_client_clunk(fid); 460 v9fs_put_acl(dacl, pacl); 461 p9_client_clunk(dfid); 462 return err; 463 } 464 465 static int 466 v9fs_vfs_getattr_dotl(struct user_namespace *mnt_userns, 467 const struct path *path, struct kstat *stat, 468 u32 request_mask, unsigned int flags) 469 { 470 struct dentry *dentry = path->dentry; 471 struct v9fs_session_info *v9ses; 472 struct p9_fid *fid; 473 struct p9_stat_dotl *st; 474 475 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry); 476 v9ses = v9fs_dentry2v9ses(dentry); 477 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 478 generic_fillattr(&init_user_ns, d_inode(dentry), stat); 479 return 0; 480 } 481 fid = v9fs_fid_lookup(dentry); 482 if (IS_ERR(fid)) 483 return PTR_ERR(fid); 484 485 /* Ask for all the fields in stat structure. Server will return 486 * whatever it supports 487 */ 488 489 st = p9_client_getattr_dotl(fid, P9_STATS_ALL); 490 p9_client_clunk(fid); 491 if (IS_ERR(st)) 492 return PTR_ERR(st); 493 494 v9fs_stat2inode_dotl(st, d_inode(dentry), 0); 495 generic_fillattr(&init_user_ns, d_inode(dentry), stat); 496 /* Change block size to what the server returned */ 497 stat->blksize = st->st_blksize; 498 499 kfree(st); 500 return 0; 501 } 502 503 /* 504 * Attribute flags. 505 */ 506 #define P9_ATTR_MODE (1 << 0) 507 #define P9_ATTR_UID (1 << 1) 508 #define P9_ATTR_GID (1 << 2) 509 #define P9_ATTR_SIZE (1 << 3) 510 #define P9_ATTR_ATIME (1 << 4) 511 #define P9_ATTR_MTIME (1 << 5) 512 #define P9_ATTR_CTIME (1 << 6) 513 #define P9_ATTR_ATIME_SET (1 << 7) 514 #define P9_ATTR_MTIME_SET (1 << 8) 515 516 struct dotl_iattr_map { 517 int iattr_valid; 518 int p9_iattr_valid; 519 }; 520 521 static int v9fs_mapped_iattr_valid(int iattr_valid) 522 { 523 int i; 524 int p9_iattr_valid = 0; 525 struct dotl_iattr_map dotl_iattr_map[] = { 526 { ATTR_MODE, P9_ATTR_MODE }, 527 { ATTR_UID, P9_ATTR_UID }, 528 { ATTR_GID, P9_ATTR_GID }, 529 { ATTR_SIZE, P9_ATTR_SIZE }, 530 { ATTR_ATIME, P9_ATTR_ATIME }, 531 { ATTR_MTIME, P9_ATTR_MTIME }, 532 { ATTR_CTIME, P9_ATTR_CTIME }, 533 { ATTR_ATIME_SET, P9_ATTR_ATIME_SET }, 534 { ATTR_MTIME_SET, P9_ATTR_MTIME_SET }, 535 }; 536 for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) { 537 if (iattr_valid & dotl_iattr_map[i].iattr_valid) 538 p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid; 539 } 540 return p9_iattr_valid; 541 } 542 543 /** 544 * v9fs_vfs_setattr_dotl - set file metadata 545 * @mnt_userns: The user namespace of the mount 546 * @dentry: file whose metadata to set 547 * @iattr: metadata assignment structure 548 * 549 */ 550 551 int v9fs_vfs_setattr_dotl(struct user_namespace *mnt_userns, 552 struct dentry *dentry, struct iattr *iattr) 553 { 554 int retval, use_dentry = 0; 555 struct p9_fid *fid = NULL; 556 struct p9_iattr_dotl p9attr; 557 struct inode *inode = d_inode(dentry); 558 559 p9_debug(P9_DEBUG_VFS, "\n"); 560 561 retval = setattr_prepare(&init_user_ns, dentry, iattr); 562 if (retval) 563 return retval; 564 565 p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid); 566 p9attr.mode = iattr->ia_mode; 567 p9attr.uid = iattr->ia_uid; 568 p9attr.gid = iattr->ia_gid; 569 p9attr.size = iattr->ia_size; 570 p9attr.atime_sec = iattr->ia_atime.tv_sec; 571 p9attr.atime_nsec = iattr->ia_atime.tv_nsec; 572 p9attr.mtime_sec = iattr->ia_mtime.tv_sec; 573 p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec; 574 575 if (iattr->ia_valid & ATTR_FILE) { 576 fid = iattr->ia_file->private_data; 577 WARN_ON(!fid); 578 } 579 if (!fid) { 580 fid = v9fs_fid_lookup(dentry); 581 use_dentry = 1; 582 } 583 if (IS_ERR(fid)) 584 return PTR_ERR(fid); 585 586 /* Write all dirty data */ 587 if (S_ISREG(inode->i_mode)) 588 filemap_write_and_wait(inode->i_mapping); 589 590 retval = p9_client_setattr(fid, &p9attr); 591 if (retval < 0) { 592 if (use_dentry) 593 p9_client_clunk(fid); 594 return retval; 595 } 596 597 if ((iattr->ia_valid & ATTR_SIZE) && 598 iattr->ia_size != i_size_read(inode)) 599 truncate_setsize(inode, iattr->ia_size); 600 601 v9fs_invalidate_inode_attr(inode); 602 setattr_copy(&init_user_ns, inode, iattr); 603 mark_inode_dirty(inode); 604 if (iattr->ia_valid & ATTR_MODE) { 605 /* We also want to update ACL when we update mode bits */ 606 retval = v9fs_acl_chmod(inode, fid); 607 if (retval < 0) { 608 if (use_dentry) 609 p9_client_clunk(fid); 610 return retval; 611 } 612 } 613 if (use_dentry) 614 p9_client_clunk(fid); 615 616 return 0; 617 } 618 619 /** 620 * v9fs_stat2inode_dotl - populate an inode structure with stat info 621 * @stat: stat structure 622 * @inode: inode to populate 623 * @flags: ctrl flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE) 624 * 625 */ 626 627 void 628 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode, 629 unsigned int flags) 630 { 631 umode_t mode; 632 struct v9fs_inode *v9inode = V9FS_I(inode); 633 634 if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) { 635 inode->i_atime.tv_sec = stat->st_atime_sec; 636 inode->i_atime.tv_nsec = stat->st_atime_nsec; 637 inode->i_mtime.tv_sec = stat->st_mtime_sec; 638 inode->i_mtime.tv_nsec = stat->st_mtime_nsec; 639 inode->i_ctime.tv_sec = stat->st_ctime_sec; 640 inode->i_ctime.tv_nsec = stat->st_ctime_nsec; 641 inode->i_uid = stat->st_uid; 642 inode->i_gid = stat->st_gid; 643 set_nlink(inode, stat->st_nlink); 644 645 mode = stat->st_mode & S_IALLUGO; 646 mode |= inode->i_mode & ~S_IALLUGO; 647 inode->i_mode = mode; 648 649 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE)) 650 v9fs_i_size_write(inode, stat->st_size); 651 inode->i_blocks = stat->st_blocks; 652 } else { 653 if (stat->st_result_mask & P9_STATS_ATIME) { 654 inode->i_atime.tv_sec = stat->st_atime_sec; 655 inode->i_atime.tv_nsec = stat->st_atime_nsec; 656 } 657 if (stat->st_result_mask & P9_STATS_MTIME) { 658 inode->i_mtime.tv_sec = stat->st_mtime_sec; 659 inode->i_mtime.tv_nsec = stat->st_mtime_nsec; 660 } 661 if (stat->st_result_mask & P9_STATS_CTIME) { 662 inode->i_ctime.tv_sec = stat->st_ctime_sec; 663 inode->i_ctime.tv_nsec = stat->st_ctime_nsec; 664 } 665 if (stat->st_result_mask & P9_STATS_UID) 666 inode->i_uid = stat->st_uid; 667 if (stat->st_result_mask & P9_STATS_GID) 668 inode->i_gid = stat->st_gid; 669 if (stat->st_result_mask & P9_STATS_NLINK) 670 set_nlink(inode, stat->st_nlink); 671 if (stat->st_result_mask & P9_STATS_MODE) { 672 mode = stat->st_mode & S_IALLUGO; 673 mode |= inode->i_mode & ~S_IALLUGO; 674 inode->i_mode = mode; 675 } 676 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE) && 677 stat->st_result_mask & P9_STATS_SIZE) 678 v9fs_i_size_write(inode, stat->st_size); 679 if (stat->st_result_mask & P9_STATS_BLOCKS) 680 inode->i_blocks = stat->st_blocks; 681 } 682 if (stat->st_result_mask & P9_STATS_GEN) 683 inode->i_generation = stat->st_gen; 684 685 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION 686 * because the inode structure does not have fields for them. 687 */ 688 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR; 689 } 690 691 static int 692 v9fs_vfs_symlink_dotl(struct user_namespace *mnt_userns, struct inode *dir, 693 struct dentry *dentry, const char *symname) 694 { 695 int err; 696 kgid_t gid; 697 const unsigned char *name; 698 struct p9_qid qid; 699 struct inode *inode; 700 struct p9_fid *dfid; 701 struct p9_fid *fid = NULL; 702 struct v9fs_session_info *v9ses; 703 704 name = dentry->d_name.name; 705 p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname); 706 v9ses = v9fs_inode2v9ses(dir); 707 708 dfid = v9fs_parent_fid(dentry); 709 if (IS_ERR(dfid)) { 710 err = PTR_ERR(dfid); 711 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 712 return err; 713 } 714 715 gid = v9fs_get_fsgid_for_create(dir); 716 717 /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */ 718 err = p9_client_symlink(dfid, name, symname, gid, &qid); 719 720 if (err < 0) { 721 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err); 722 goto error; 723 } 724 725 v9fs_invalidate_inode_attr(dir); 726 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 727 /* Now walk from the parent so we can get an unopened fid. */ 728 fid = p9_client_walk(dfid, 1, &name, 1); 729 if (IS_ERR(fid)) { 730 err = PTR_ERR(fid); 731 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", 732 err); 733 fid = NULL; 734 goto error; 735 } 736 737 /* instantiate inode and assign the unopened fid to dentry */ 738 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 739 if (IS_ERR(inode)) { 740 err = PTR_ERR(inode); 741 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", 742 err); 743 goto error; 744 } 745 v9fs_fid_add(dentry, fid); 746 d_instantiate(dentry, inode); 747 fid = NULL; 748 err = 0; 749 } else { 750 /* Not in cached mode. No need to populate inode with stat */ 751 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0); 752 if (IS_ERR(inode)) { 753 err = PTR_ERR(inode); 754 goto error; 755 } 756 d_instantiate(dentry, inode); 757 } 758 759 error: 760 if (fid) 761 p9_client_clunk(fid); 762 763 p9_client_clunk(dfid); 764 return err; 765 } 766 767 /** 768 * v9fs_vfs_link_dotl - create a hardlink for dotl 769 * @old_dentry: dentry for file to link to 770 * @dir: inode destination for new link 771 * @dentry: dentry for link 772 * 773 */ 774 775 static int 776 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir, 777 struct dentry *dentry) 778 { 779 int err; 780 struct p9_fid *dfid, *oldfid; 781 struct v9fs_session_info *v9ses; 782 783 p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %pd, new_name: %pd\n", 784 dir->i_ino, old_dentry, dentry); 785 786 v9ses = v9fs_inode2v9ses(dir); 787 dfid = v9fs_parent_fid(dentry); 788 if (IS_ERR(dfid)) 789 return PTR_ERR(dfid); 790 791 oldfid = v9fs_fid_lookup(old_dentry); 792 if (IS_ERR(oldfid)) { 793 p9_client_clunk(dfid); 794 return PTR_ERR(oldfid); 795 } 796 797 err = p9_client_link(dfid, oldfid, dentry->d_name.name); 798 799 p9_client_clunk(dfid); 800 p9_client_clunk(oldfid); 801 if (err < 0) { 802 p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err); 803 return err; 804 } 805 806 v9fs_invalidate_inode_attr(dir); 807 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 808 /* Get the latest stat info from server. */ 809 struct p9_fid *fid; 810 fid = v9fs_fid_lookup(old_dentry); 811 if (IS_ERR(fid)) 812 return PTR_ERR(fid); 813 814 v9fs_refresh_inode_dotl(fid, d_inode(old_dentry)); 815 p9_client_clunk(fid); 816 } 817 ihold(d_inode(old_dentry)); 818 d_instantiate(dentry, d_inode(old_dentry)); 819 820 return err; 821 } 822 823 /** 824 * v9fs_vfs_mknod_dotl - create a special file 825 * @mnt_userns: The user namespace of the mount 826 * @dir: inode destination for new link 827 * @dentry: dentry for file 828 * @omode: mode for creation 829 * @rdev: device associated with special file 830 * 831 */ 832 static int 833 v9fs_vfs_mknod_dotl(struct user_namespace *mnt_userns, struct inode *dir, 834 struct dentry *dentry, umode_t omode, dev_t rdev) 835 { 836 int err; 837 kgid_t gid; 838 const unsigned char *name; 839 umode_t mode; 840 struct v9fs_session_info *v9ses; 841 struct p9_fid *fid = NULL, *dfid = NULL; 842 struct inode *inode; 843 struct p9_qid qid; 844 struct posix_acl *dacl = NULL, *pacl = NULL; 845 846 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %hx MAJOR: %u MINOR: %u\n", 847 dir->i_ino, dentry, omode, 848 MAJOR(rdev), MINOR(rdev)); 849 850 v9ses = v9fs_inode2v9ses(dir); 851 dfid = v9fs_parent_fid(dentry); 852 if (IS_ERR(dfid)) { 853 err = PTR_ERR(dfid); 854 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 855 dfid = NULL; 856 goto error; 857 } 858 859 gid = v9fs_get_fsgid_for_create(dir); 860 mode = omode; 861 /* Update mode based on ACL value */ 862 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); 863 if (err) { 864 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n", 865 err); 866 goto error; 867 } 868 name = dentry->d_name.name; 869 870 err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid); 871 if (err < 0) 872 goto error; 873 874 v9fs_invalidate_inode_attr(dir); 875 fid = p9_client_walk(dfid, 1, &name, 1); 876 if (IS_ERR(fid)) { 877 err = PTR_ERR(fid); 878 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", 879 err); 880 fid = NULL; 881 goto error; 882 } 883 884 /* instantiate inode and assign the unopened fid to the dentry */ 885 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 886 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 887 if (IS_ERR(inode)) { 888 err = PTR_ERR(inode); 889 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", 890 err); 891 goto error; 892 } 893 v9fs_set_create_acl(inode, fid, dacl, pacl); 894 v9fs_fid_add(dentry, fid); 895 d_instantiate(dentry, inode); 896 fid = NULL; 897 err = 0; 898 } else { 899 /* 900 * Not in cached mode. No need to populate inode with stat. 901 * socket syscall returns a fd, so we need instantiate 902 */ 903 inode = v9fs_get_inode(dir->i_sb, mode, rdev); 904 if (IS_ERR(inode)) { 905 err = PTR_ERR(inode); 906 goto error; 907 } 908 v9fs_set_create_acl(inode, fid, dacl, pacl); 909 d_instantiate(dentry, inode); 910 } 911 error: 912 if (fid) 913 p9_client_clunk(fid); 914 v9fs_put_acl(dacl, pacl); 915 p9_client_clunk(dfid); 916 917 return err; 918 } 919 920 /** 921 * v9fs_vfs_get_link_dotl - follow a symlink path 922 * @dentry: dentry for symlink 923 * @inode: inode for symlink 924 * @done: destructor for return value 925 */ 926 927 static const char * 928 v9fs_vfs_get_link_dotl(struct dentry *dentry, 929 struct inode *inode, 930 struct delayed_call *done) 931 { 932 struct p9_fid *fid; 933 char *target; 934 int retval; 935 936 if (!dentry) 937 return ERR_PTR(-ECHILD); 938 939 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry); 940 941 fid = v9fs_fid_lookup(dentry); 942 if (IS_ERR(fid)) 943 return ERR_CAST(fid); 944 retval = p9_client_readlink(fid, &target); 945 p9_client_clunk(fid); 946 if (retval) 947 return ERR_PTR(retval); 948 set_delayed_call(done, kfree_link, target); 949 return target; 950 } 951 952 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode) 953 { 954 struct p9_stat_dotl *st; 955 struct v9fs_session_info *v9ses; 956 unsigned int flags; 957 958 v9ses = v9fs_inode2v9ses(inode); 959 st = p9_client_getattr_dotl(fid, P9_STATS_ALL); 960 if (IS_ERR(st)) 961 return PTR_ERR(st); 962 /* 963 * Don't update inode if the file type is different 964 */ 965 if (inode_wrong_type(inode, st->st_mode)) 966 goto out; 967 968 /* 969 * We don't want to refresh inode->i_size, 970 * because we may have cached data 971 */ 972 flags = (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) ? 973 V9FS_STAT2INODE_KEEP_ISIZE : 0; 974 v9fs_stat2inode_dotl(st, inode, flags); 975 out: 976 kfree(st); 977 return 0; 978 } 979 980 const struct inode_operations v9fs_dir_inode_operations_dotl = { 981 .create = v9fs_vfs_create_dotl, 982 .atomic_open = v9fs_vfs_atomic_open_dotl, 983 .lookup = v9fs_vfs_lookup, 984 .link = v9fs_vfs_link_dotl, 985 .symlink = v9fs_vfs_symlink_dotl, 986 .unlink = v9fs_vfs_unlink, 987 .mkdir = v9fs_vfs_mkdir_dotl, 988 .rmdir = v9fs_vfs_rmdir, 989 .mknod = v9fs_vfs_mknod_dotl, 990 .rename = v9fs_vfs_rename, 991 .getattr = v9fs_vfs_getattr_dotl, 992 .setattr = v9fs_vfs_setattr_dotl, 993 .listxattr = v9fs_listxattr, 994 .get_acl = v9fs_iop_get_acl, 995 }; 996 997 const struct inode_operations v9fs_file_inode_operations_dotl = { 998 .getattr = v9fs_vfs_getattr_dotl, 999 .setattr = v9fs_vfs_setattr_dotl, 1000 .listxattr = v9fs_listxattr, 1001 .get_acl = v9fs_iop_get_acl, 1002 }; 1003 1004 const struct inode_operations v9fs_symlink_inode_operations_dotl = { 1005 .get_link = v9fs_vfs_get_link_dotl, 1006 .getattr = v9fs_vfs_getattr_dotl, 1007 .setattr = v9fs_vfs_setattr_dotl, 1008 .listxattr = v9fs_listxattr, 1009 }; 1010