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/namei.h> 17 #include <linux/sched.h> 18 #include <linux/slab.h> 19 #include <linux/xattr.h> 20 #include <linux/posix_acl.h> 21 #include <net/9p/9p.h> 22 #include <net/9p/client.h> 23 24 #include "v9fs.h" 25 #include "v9fs_vfs.h" 26 #include "fid.h" 27 #include "cache.h" 28 #include "xattr.h" 29 #include "acl.h" 30 31 static int 32 v9fs_vfs_mknod_dotl(struct mnt_idmap *idmap, struct inode *dir, 33 struct dentry *dentry, umode_t omode, dev_t rdev); 34 35 /** 36 * v9fs_get_fsgid_for_create - Helper function to get the gid for a new object 37 * @dir_inode: The directory inode 38 * 39 * Helper function to get the gid for creating a 40 * new file system object. This checks the S_ISGID to determine the owning 41 * group of the new file system object. 42 */ 43 44 static kgid_t v9fs_get_fsgid_for_create(struct inode *dir_inode) 45 { 46 BUG_ON(dir_inode == NULL); 47 48 if (dir_inode->i_mode & S_ISGID) { 49 /* set_gid bit is set.*/ 50 return dir_inode->i_gid; 51 } 52 return current_fsgid(); 53 } 54 55 static int v9fs_test_inode_dotl(struct inode *inode, void *data) 56 { 57 struct v9fs_inode *v9inode = V9FS_I(inode); 58 struct p9_stat_dotl *st = (struct p9_stat_dotl *)data; 59 60 /* don't match inode of different type */ 61 if (inode_wrong_type(inode, st->st_mode)) 62 return 0; 63 64 if (inode->i_generation != st->st_gen) 65 return 0; 66 67 /* compare qid details */ 68 if (memcmp(&v9inode->qid.version, 69 &st->qid.version, sizeof(v9inode->qid.version))) 70 return 0; 71 72 if (v9inode->qid.type != st->qid.type) 73 return 0; 74 75 if (v9inode->qid.path != st->qid.path) 76 return 0; 77 return 1; 78 } 79 80 /* Always get a new inode */ 81 static int v9fs_test_new_inode_dotl(struct inode *inode, void *data) 82 { 83 return 0; 84 } 85 86 static int v9fs_set_inode_dotl(struct inode *inode, void *data) 87 { 88 struct v9fs_inode *v9inode = V9FS_I(inode); 89 struct p9_stat_dotl *st = (struct p9_stat_dotl *)data; 90 91 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid)); 92 inode->i_generation = st->st_gen; 93 return 0; 94 } 95 96 static struct inode *v9fs_qid_iget_dotl(struct super_block *sb, 97 struct p9_qid *qid, 98 struct p9_fid *fid, 99 struct p9_stat_dotl *st, 100 int new) 101 { 102 int retval; 103 unsigned long i_ino; 104 struct inode *inode; 105 struct v9fs_session_info *v9ses = sb->s_fs_info; 106 int (*test)(struct inode *inode, void *data); 107 108 if (new) 109 test = v9fs_test_new_inode_dotl; 110 else 111 test = v9fs_test_inode_dotl; 112 113 i_ino = v9fs_qid2ino(qid); 114 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode_dotl, st); 115 if (!inode) 116 return ERR_PTR(-ENOMEM); 117 if (!(inode->i_state & I_NEW)) 118 return inode; 119 /* 120 * initialize the inode with the stat info 121 * FIXME!! we may need support for stale inodes 122 * later. 123 */ 124 inode->i_ino = i_ino; 125 retval = v9fs_init_inode(v9ses, inode, 126 st->st_mode, new_decode_dev(st->st_rdev)); 127 if (retval) 128 goto error; 129 130 v9fs_stat2inode_dotl(st, inode, 0); 131 v9fs_cache_inode_get_cookie(inode); 132 retval = v9fs_get_acl(inode, fid); 133 if (retval) 134 goto error; 135 136 unlock_new_inode(inode); 137 return inode; 138 error: 139 iget_failed(inode); 140 return ERR_PTR(retval); 141 142 } 143 144 struct inode * 145 v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid, 146 struct super_block *sb, int new) 147 { 148 struct p9_stat_dotl *st; 149 struct inode *inode = NULL; 150 151 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN); 152 if (IS_ERR(st)) 153 return ERR_CAST(st); 154 155 inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st, new); 156 kfree(st); 157 return inode; 158 } 159 160 struct dotl_openflag_map { 161 int open_flag; 162 int dotl_flag; 163 }; 164 165 static int v9fs_mapped_dotl_flags(int flags) 166 { 167 int i; 168 int rflags = 0; 169 struct dotl_openflag_map dotl_oflag_map[] = { 170 { O_CREAT, P9_DOTL_CREATE }, 171 { O_EXCL, P9_DOTL_EXCL }, 172 { O_NOCTTY, P9_DOTL_NOCTTY }, 173 { O_APPEND, P9_DOTL_APPEND }, 174 { O_NONBLOCK, P9_DOTL_NONBLOCK }, 175 { O_DSYNC, P9_DOTL_DSYNC }, 176 { FASYNC, P9_DOTL_FASYNC }, 177 { O_DIRECT, P9_DOTL_DIRECT }, 178 { O_LARGEFILE, P9_DOTL_LARGEFILE }, 179 { O_DIRECTORY, P9_DOTL_DIRECTORY }, 180 { O_NOFOLLOW, P9_DOTL_NOFOLLOW }, 181 { O_NOATIME, P9_DOTL_NOATIME }, 182 { O_CLOEXEC, P9_DOTL_CLOEXEC }, 183 { O_SYNC, P9_DOTL_SYNC}, 184 }; 185 for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) { 186 if (flags & dotl_oflag_map[i].open_flag) 187 rflags |= dotl_oflag_map[i].dotl_flag; 188 } 189 return rflags; 190 } 191 192 /** 193 * v9fs_open_to_dotl_flags- convert Linux specific open flags to 194 * plan 9 open flag. 195 * @flags: flags to convert 196 */ 197 int v9fs_open_to_dotl_flags(int flags) 198 { 199 int rflags = 0; 200 201 /* 202 * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY 203 * and P9_DOTL_NOACCESS 204 */ 205 rflags |= flags & O_ACCMODE; 206 rflags |= v9fs_mapped_dotl_flags(flags); 207 208 return rflags; 209 } 210 211 /** 212 * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol. 213 * @idmap: The user namespace of the mount 214 * @dir: directory inode that is being created 215 * @dentry: dentry that is being deleted 216 * @omode: create permissions 217 * @excl: True if the file must not yet exist 218 * 219 */ 220 static int 221 v9fs_vfs_create_dotl(struct mnt_idmap *idmap, struct inode *dir, 222 struct dentry *dentry, umode_t omode, bool excl) 223 { 224 return v9fs_vfs_mknod_dotl(idmap, 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 int flags, umode_t omode) 230 { 231 int err = 0; 232 kgid_t gid; 233 umode_t mode; 234 int p9_omode = v9fs_open_to_dotl_flags(flags); 235 const unsigned char *name = NULL; 236 struct p9_qid qid; 237 struct inode *inode; 238 struct p9_fid *fid = NULL; 239 struct p9_fid *dfid = NULL, *ofid = NULL; 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%x\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 create %d\n", 285 err); 286 goto out; 287 } 288 289 if ((v9ses->cache & CACHE_WRITEBACK) && (p9_omode & P9_OWRITE)) { 290 p9_omode = (p9_omode & ~P9_OWRITE) | P9_ORDWR; 291 p9_debug(P9_DEBUG_CACHE, 292 "write-only file with writeback enabled, creating w/ O_RDWR\n"); 293 } 294 err = p9_client_create_dotl(ofid, name, p9_omode, mode, gid, &qid); 295 if (err < 0) { 296 p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in create %d\n", 297 err); 298 goto out; 299 } 300 v9fs_invalidate_inode_attr(dir); 301 302 /* instantiate inode and assign the unopened fid to the dentry */ 303 fid = p9_client_walk(dfid, 1, &name, 1); 304 if (IS_ERR(fid)) { 305 err = PTR_ERR(fid); 306 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 307 goto out; 308 } 309 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 310 if (IS_ERR(inode)) { 311 err = PTR_ERR(inode); 312 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err); 313 goto out; 314 } 315 /* Now set the ACL based on the default value */ 316 v9fs_set_create_acl(inode, fid, dacl, pacl); 317 318 v9fs_fid_add(dentry, &fid); 319 d_instantiate(dentry, inode); 320 321 /* Since we are opening a file, assign the open fid to the file */ 322 err = finish_open(file, dentry, generic_file_open); 323 if (err) 324 goto out; 325 file->private_data = ofid; 326 #ifdef CONFIG_9P_FSCACHE 327 if (v9ses->cache & CACHE_FSCACHE) { 328 struct v9fs_inode *v9inode = V9FS_I(inode); 329 fscache_use_cookie(v9fs_inode_cookie(v9inode), 330 file->f_mode & FMODE_WRITE); 331 } 332 #endif 333 v9fs_fid_add_modes(ofid, v9ses->flags, v9ses->cache, flags); 334 v9fs_open_fid_add(inode, &ofid); 335 file->f_mode |= FMODE_CREATED; 336 out: 337 p9_fid_put(dfid); 338 p9_fid_put(ofid); 339 p9_fid_put(fid); 340 v9fs_put_acl(dacl, pacl); 341 dput(res); 342 return err; 343 } 344 345 /** 346 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory 347 * @idmap: The idmap of the mount 348 * @dir: inode that is being unlinked 349 * @dentry: dentry that is being unlinked 350 * @omode: mode for new directory 351 * 352 */ 353 354 static int v9fs_vfs_mkdir_dotl(struct mnt_idmap *idmap, 355 struct inode *dir, struct dentry *dentry, 356 umode_t omode) 357 { 358 int err; 359 struct v9fs_session_info *v9ses; 360 struct p9_fid *fid = NULL, *dfid = NULL; 361 kgid_t gid; 362 const unsigned char *name; 363 umode_t mode; 364 struct inode *inode; 365 struct p9_qid qid; 366 struct posix_acl *dacl = NULL, *pacl = NULL; 367 368 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry); 369 v9ses = v9fs_inode2v9ses(dir); 370 371 omode |= S_IFDIR; 372 if (dir->i_mode & S_ISGID) 373 omode |= S_ISGID; 374 375 dfid = v9fs_parent_fid(dentry); 376 if (IS_ERR(dfid)) { 377 err = PTR_ERR(dfid); 378 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 379 goto error; 380 } 381 382 gid = v9fs_get_fsgid_for_create(dir); 383 mode = omode; 384 /* Update mode based on ACL value */ 385 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); 386 if (err) { 387 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n", 388 err); 389 goto error; 390 } 391 name = dentry->d_name.name; 392 err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid); 393 if (err < 0) 394 goto error; 395 fid = p9_client_walk(dfid, 1, &name, 1); 396 if (IS_ERR(fid)) { 397 err = PTR_ERR(fid); 398 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", 399 err); 400 goto error; 401 } 402 403 /* instantiate inode and assign the unopened fid to the dentry */ 404 if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) { 405 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 406 if (IS_ERR(inode)) { 407 err = PTR_ERR(inode); 408 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", 409 err); 410 goto error; 411 } 412 v9fs_fid_add(dentry, &fid); 413 v9fs_set_create_acl(inode, fid, dacl, pacl); 414 d_instantiate(dentry, inode); 415 err = 0; 416 } else { 417 /* 418 * Not in cached mode. No need to populate 419 * inode with stat. We need to get an inode 420 * so that we can set the acl with dentry 421 */ 422 inode = v9fs_get_inode(dir->i_sb, mode, 0); 423 if (IS_ERR(inode)) { 424 err = PTR_ERR(inode); 425 goto error; 426 } 427 v9fs_set_create_acl(inode, fid, dacl, pacl); 428 d_instantiate(dentry, inode); 429 } 430 inc_nlink(dir); 431 v9fs_invalidate_inode_attr(dir); 432 error: 433 p9_fid_put(fid); 434 v9fs_put_acl(dacl, pacl); 435 p9_fid_put(dfid); 436 return err; 437 } 438 439 static int 440 v9fs_vfs_getattr_dotl(struct mnt_idmap *idmap, 441 const struct path *path, struct kstat *stat, 442 u32 request_mask, unsigned int flags) 443 { 444 struct dentry *dentry = path->dentry; 445 struct v9fs_session_info *v9ses; 446 struct p9_fid *fid; 447 struct inode *inode = d_inode(dentry); 448 struct p9_stat_dotl *st; 449 450 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry); 451 v9ses = v9fs_dentry2v9ses(dentry); 452 if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) { 453 generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat); 454 return 0; 455 } else if (v9ses->cache) { 456 if (S_ISREG(inode->i_mode)) { 457 int retval = filemap_fdatawrite(inode->i_mapping); 458 459 if (retval) 460 p9_debug(P9_DEBUG_ERROR, 461 "flushing writeback during getattr returned %d\n", retval); 462 } 463 } 464 fid = v9fs_fid_lookup(dentry); 465 if (IS_ERR(fid)) 466 return PTR_ERR(fid); 467 468 /* Ask for all the fields in stat structure. Server will return 469 * whatever it supports 470 */ 471 472 st = p9_client_getattr_dotl(fid, P9_STATS_ALL); 473 p9_fid_put(fid); 474 if (IS_ERR(st)) 475 return PTR_ERR(st); 476 477 v9fs_stat2inode_dotl(st, d_inode(dentry), 0); 478 generic_fillattr(&nop_mnt_idmap, request_mask, d_inode(dentry), stat); 479 /* Change block size to what the server returned */ 480 stat->blksize = st->st_blksize; 481 482 kfree(st); 483 return 0; 484 } 485 486 /* 487 * Attribute flags. 488 */ 489 #define P9_ATTR_MODE (1 << 0) 490 #define P9_ATTR_UID (1 << 1) 491 #define P9_ATTR_GID (1 << 2) 492 #define P9_ATTR_SIZE (1 << 3) 493 #define P9_ATTR_ATIME (1 << 4) 494 #define P9_ATTR_MTIME (1 << 5) 495 #define P9_ATTR_CTIME (1 << 6) 496 #define P9_ATTR_ATIME_SET (1 << 7) 497 #define P9_ATTR_MTIME_SET (1 << 8) 498 499 struct dotl_iattr_map { 500 int iattr_valid; 501 int p9_iattr_valid; 502 }; 503 504 static int v9fs_mapped_iattr_valid(int iattr_valid) 505 { 506 int i; 507 int p9_iattr_valid = 0; 508 struct dotl_iattr_map dotl_iattr_map[] = { 509 { ATTR_MODE, P9_ATTR_MODE }, 510 { ATTR_UID, P9_ATTR_UID }, 511 { ATTR_GID, P9_ATTR_GID }, 512 { ATTR_SIZE, P9_ATTR_SIZE }, 513 { ATTR_ATIME, P9_ATTR_ATIME }, 514 { ATTR_MTIME, P9_ATTR_MTIME }, 515 { ATTR_CTIME, P9_ATTR_CTIME }, 516 { ATTR_ATIME_SET, P9_ATTR_ATIME_SET }, 517 { ATTR_MTIME_SET, P9_ATTR_MTIME_SET }, 518 }; 519 for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) { 520 if (iattr_valid & dotl_iattr_map[i].iattr_valid) 521 p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid; 522 } 523 return p9_iattr_valid; 524 } 525 526 /** 527 * v9fs_vfs_setattr_dotl - set file metadata 528 * @idmap: idmap of the mount 529 * @dentry: file whose metadata to set 530 * @iattr: metadata assignment structure 531 * 532 */ 533 534 int v9fs_vfs_setattr_dotl(struct mnt_idmap *idmap, 535 struct dentry *dentry, struct iattr *iattr) 536 { 537 int retval, use_dentry = 0; 538 struct inode *inode = d_inode(dentry); 539 struct v9fs_session_info __maybe_unused *v9ses; 540 struct p9_fid *fid = NULL; 541 struct p9_iattr_dotl p9attr = { 542 .uid = INVALID_UID, 543 .gid = INVALID_GID, 544 }; 545 546 p9_debug(P9_DEBUG_VFS, "\n"); 547 548 retval = setattr_prepare(&nop_mnt_idmap, dentry, iattr); 549 if (retval) 550 return retval; 551 552 v9ses = v9fs_dentry2v9ses(dentry); 553 554 p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid); 555 if (iattr->ia_valid & ATTR_MODE) 556 p9attr.mode = iattr->ia_mode; 557 if (iattr->ia_valid & ATTR_UID) 558 p9attr.uid = iattr->ia_uid; 559 if (iattr->ia_valid & ATTR_GID) 560 p9attr.gid = iattr->ia_gid; 561 if (iattr->ia_valid & ATTR_SIZE) 562 p9attr.size = iattr->ia_size; 563 if (iattr->ia_valid & ATTR_ATIME_SET) { 564 p9attr.atime_sec = iattr->ia_atime.tv_sec; 565 p9attr.atime_nsec = iattr->ia_atime.tv_nsec; 566 } 567 if (iattr->ia_valid & ATTR_MTIME_SET) { 568 p9attr.mtime_sec = iattr->ia_mtime.tv_sec; 569 p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec; 570 } 571 572 if (iattr->ia_valid & ATTR_FILE) { 573 fid = iattr->ia_file->private_data; 574 WARN_ON(!fid); 575 } 576 if (!fid) { 577 fid = v9fs_fid_lookup(dentry); 578 use_dentry = 1; 579 } 580 if (IS_ERR(fid)) 581 return PTR_ERR(fid); 582 583 /* Write all dirty data */ 584 if (S_ISREG(inode->i_mode)) { 585 retval = filemap_fdatawrite(inode->i_mapping); 586 if (retval < 0) 587 p9_debug(P9_DEBUG_ERROR, 588 "Flushing file prior to setattr failed: %d\n", retval); 589 } 590 591 retval = p9_client_setattr(fid, &p9attr); 592 if (retval < 0) { 593 if (use_dentry) 594 p9_fid_put(fid); 595 return retval; 596 } 597 598 if ((iattr->ia_valid & ATTR_SIZE) && iattr->ia_size != 599 i_size_read(inode)) { 600 truncate_setsize(inode, iattr->ia_size); 601 truncate_pagecache(inode, iattr->ia_size); 602 603 #ifdef CONFIG_9P_FSCACHE 604 if (v9ses->cache & CACHE_FSCACHE) 605 fscache_resize_cookie(v9fs_inode_cookie(V9FS_I(inode)), 606 iattr->ia_size); 607 #endif 608 } 609 610 v9fs_invalidate_inode_attr(inode); 611 setattr_copy(&nop_mnt_idmap, inode, iattr); 612 mark_inode_dirty(inode); 613 if (iattr->ia_valid & ATTR_MODE) { 614 /* We also want to update ACL when we update mode bits */ 615 retval = v9fs_acl_chmod(inode, fid); 616 if (retval < 0) { 617 if (use_dentry) 618 p9_fid_put(fid); 619 return retval; 620 } 621 } 622 if (use_dentry) 623 p9_fid_put(fid); 624 625 return 0; 626 } 627 628 /** 629 * v9fs_stat2inode_dotl - populate an inode structure with stat info 630 * @stat: stat structure 631 * @inode: inode to populate 632 * @flags: ctrl flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE) 633 * 634 */ 635 636 void 637 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode, 638 unsigned int flags) 639 { 640 umode_t mode; 641 struct v9fs_inode *v9inode = V9FS_I(inode); 642 643 if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) { 644 inode_set_atime(inode, stat->st_atime_sec, 645 stat->st_atime_nsec); 646 inode_set_mtime(inode, stat->st_mtime_sec, 647 stat->st_mtime_nsec); 648 inode_set_ctime(inode, stat->st_ctime_sec, 649 stat->st_ctime_nsec); 650 inode->i_uid = stat->st_uid; 651 inode->i_gid = stat->st_gid; 652 set_nlink(inode, stat->st_nlink); 653 654 mode = stat->st_mode & S_IALLUGO; 655 mode |= inode->i_mode & ~S_IALLUGO; 656 inode->i_mode = mode; 657 658 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE)) 659 v9fs_i_size_write(inode, stat->st_size); 660 inode->i_blocks = stat->st_blocks; 661 } else { 662 if (stat->st_result_mask & P9_STATS_ATIME) { 663 inode_set_atime(inode, stat->st_atime_sec, 664 stat->st_atime_nsec); 665 } 666 if (stat->st_result_mask & P9_STATS_MTIME) { 667 inode_set_mtime(inode, stat->st_mtime_sec, 668 stat->st_mtime_nsec); 669 } 670 if (stat->st_result_mask & P9_STATS_CTIME) { 671 inode_set_ctime(inode, stat->st_ctime_sec, 672 stat->st_ctime_nsec); 673 } 674 if (stat->st_result_mask & P9_STATS_UID) 675 inode->i_uid = stat->st_uid; 676 if (stat->st_result_mask & P9_STATS_GID) 677 inode->i_gid = stat->st_gid; 678 if (stat->st_result_mask & P9_STATS_NLINK) 679 set_nlink(inode, stat->st_nlink); 680 if (stat->st_result_mask & P9_STATS_MODE) { 681 mode = stat->st_mode & S_IALLUGO; 682 mode |= inode->i_mode & ~S_IALLUGO; 683 inode->i_mode = mode; 684 } 685 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE) && 686 stat->st_result_mask & P9_STATS_SIZE) 687 v9fs_i_size_write(inode, stat->st_size); 688 if (stat->st_result_mask & P9_STATS_BLOCKS) 689 inode->i_blocks = stat->st_blocks; 690 } 691 if (stat->st_result_mask & P9_STATS_GEN) 692 inode->i_generation = stat->st_gen; 693 694 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION 695 * because the inode structure does not have fields for them. 696 */ 697 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR; 698 } 699 700 static int 701 v9fs_vfs_symlink_dotl(struct mnt_idmap *idmap, struct inode *dir, 702 struct dentry *dentry, const char *symname) 703 { 704 int err; 705 kgid_t gid; 706 const unsigned char *name; 707 struct p9_qid qid; 708 struct inode *inode; 709 struct p9_fid *dfid; 710 struct p9_fid *fid = NULL; 711 struct v9fs_session_info *v9ses; 712 713 name = dentry->d_name.name; 714 p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname); 715 v9ses = v9fs_inode2v9ses(dir); 716 717 dfid = v9fs_parent_fid(dentry); 718 if (IS_ERR(dfid)) { 719 err = PTR_ERR(dfid); 720 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 721 return err; 722 } 723 724 gid = v9fs_get_fsgid_for_create(dir); 725 726 /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */ 727 err = p9_client_symlink(dfid, name, symname, gid, &qid); 728 729 if (err < 0) { 730 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err); 731 goto error; 732 } 733 734 v9fs_invalidate_inode_attr(dir); 735 if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) { 736 /* Now walk from the parent so we can get an unopened fid. */ 737 fid = p9_client_walk(dfid, 1, &name, 1); 738 if (IS_ERR(fid)) { 739 err = PTR_ERR(fid); 740 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", 741 err); 742 goto error; 743 } 744 745 /* instantiate inode and assign the unopened fid to dentry */ 746 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 747 if (IS_ERR(inode)) { 748 err = PTR_ERR(inode); 749 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", 750 err); 751 goto error; 752 } 753 v9fs_fid_add(dentry, &fid); 754 d_instantiate(dentry, inode); 755 err = 0; 756 } else { 757 /* Not in cached mode. No need to populate inode with stat */ 758 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0); 759 if (IS_ERR(inode)) { 760 err = PTR_ERR(inode); 761 goto error; 762 } 763 d_instantiate(dentry, inode); 764 } 765 766 error: 767 p9_fid_put(fid); 768 p9_fid_put(dfid); 769 return err; 770 } 771 772 /** 773 * v9fs_vfs_link_dotl - create a hardlink for dotl 774 * @old_dentry: dentry for file to link to 775 * @dir: inode destination for new link 776 * @dentry: dentry for link 777 * 778 */ 779 780 static int 781 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir, 782 struct dentry *dentry) 783 { 784 int err; 785 struct p9_fid *dfid, *oldfid; 786 struct v9fs_session_info *v9ses; 787 788 p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %pd, new_name: %pd\n", 789 dir->i_ino, old_dentry, dentry); 790 791 v9ses = v9fs_inode2v9ses(dir); 792 dfid = v9fs_parent_fid(dentry); 793 if (IS_ERR(dfid)) 794 return PTR_ERR(dfid); 795 796 oldfid = v9fs_fid_lookup(old_dentry); 797 if (IS_ERR(oldfid)) { 798 p9_fid_put(dfid); 799 return PTR_ERR(oldfid); 800 } 801 802 err = p9_client_link(dfid, oldfid, dentry->d_name.name); 803 804 p9_fid_put(dfid); 805 p9_fid_put(oldfid); 806 if (err < 0) { 807 p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err); 808 return err; 809 } 810 811 v9fs_invalidate_inode_attr(dir); 812 if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) { 813 /* Get the latest stat info from server. */ 814 struct p9_fid *fid; 815 816 fid = v9fs_fid_lookup(old_dentry); 817 if (IS_ERR(fid)) 818 return PTR_ERR(fid); 819 820 v9fs_refresh_inode_dotl(fid, d_inode(old_dentry)); 821 p9_fid_put(fid); 822 } 823 ihold(d_inode(old_dentry)); 824 d_instantiate(dentry, d_inode(old_dentry)); 825 826 return err; 827 } 828 829 /** 830 * v9fs_vfs_mknod_dotl - create a special file 831 * @idmap: The idmap of the mount 832 * @dir: inode destination for new link 833 * @dentry: dentry for file 834 * @omode: mode for creation 835 * @rdev: device associated with special file 836 * 837 */ 838 static int 839 v9fs_vfs_mknod_dotl(struct mnt_idmap *idmap, struct inode *dir, 840 struct dentry *dentry, umode_t omode, dev_t rdev) 841 { 842 int err; 843 kgid_t gid; 844 const unsigned char *name; 845 umode_t mode; 846 struct v9fs_session_info *v9ses; 847 struct p9_fid *fid = NULL, *dfid = NULL; 848 struct inode *inode; 849 struct p9_qid qid; 850 struct posix_acl *dacl = NULL, *pacl = NULL; 851 852 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %x MAJOR: %u MINOR: %u\n", 853 dir->i_ino, dentry, omode, 854 MAJOR(rdev), MINOR(rdev)); 855 856 v9ses = v9fs_inode2v9ses(dir); 857 dfid = v9fs_parent_fid(dentry); 858 if (IS_ERR(dfid)) { 859 err = PTR_ERR(dfid); 860 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 861 goto error; 862 } 863 864 gid = v9fs_get_fsgid_for_create(dir); 865 mode = omode; 866 /* Update mode based on ACL value */ 867 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); 868 if (err) { 869 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n", 870 err); 871 goto error; 872 } 873 name = dentry->d_name.name; 874 875 err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid); 876 if (err < 0) 877 goto error; 878 879 v9fs_invalidate_inode_attr(dir); 880 fid = p9_client_walk(dfid, 1, &name, 1); 881 if (IS_ERR(fid)) { 882 err = PTR_ERR(fid); 883 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", 884 err); 885 goto error; 886 } 887 888 /* instantiate inode and assign the unopened fid to the dentry */ 889 if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) { 890 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 891 if (IS_ERR(inode)) { 892 err = PTR_ERR(inode); 893 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", 894 err); 895 goto error; 896 } 897 v9fs_set_create_acl(inode, fid, dacl, pacl); 898 v9fs_fid_add(dentry, &fid); 899 d_instantiate(dentry, inode); 900 err = 0; 901 } else { 902 /* 903 * Not in cached mode. No need to populate inode with stat. 904 * socket syscall returns a fd, so we need instantiate 905 */ 906 inode = v9fs_get_inode(dir->i_sb, mode, rdev); 907 if (IS_ERR(inode)) { 908 err = PTR_ERR(inode); 909 goto error; 910 } 911 v9fs_set_create_acl(inode, fid, dacl, pacl); 912 d_instantiate(dentry, inode); 913 } 914 error: 915 p9_fid_put(fid); 916 v9fs_put_acl(dacl, pacl); 917 p9_fid_put(dfid); 918 919 return err; 920 } 921 922 /** 923 * v9fs_vfs_get_link_dotl - follow a symlink path 924 * @dentry: dentry for symlink 925 * @inode: inode for symlink 926 * @done: destructor for return value 927 */ 928 929 static const char * 930 v9fs_vfs_get_link_dotl(struct dentry *dentry, 931 struct inode *inode, 932 struct delayed_call *done) 933 { 934 struct p9_fid *fid; 935 char *target; 936 int retval; 937 938 if (!dentry) 939 return ERR_PTR(-ECHILD); 940 941 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry); 942 943 fid = v9fs_fid_lookup(dentry); 944 if (IS_ERR(fid)) 945 return ERR_CAST(fid); 946 retval = p9_client_readlink(fid, &target); 947 p9_fid_put(fid); 948 if (retval) 949 return ERR_PTR(retval); 950 set_delayed_call(done, kfree_link, target); 951 return target; 952 } 953 954 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode) 955 { 956 struct p9_stat_dotl *st; 957 struct v9fs_session_info *v9ses; 958 unsigned int flags; 959 960 v9ses = v9fs_inode2v9ses(inode); 961 st = p9_client_getattr_dotl(fid, P9_STATS_ALL); 962 if (IS_ERR(st)) 963 return PTR_ERR(st); 964 /* 965 * Don't update inode if the file type is different 966 */ 967 if (inode_wrong_type(inode, st->st_mode)) 968 goto out; 969 970 /* 971 * We don't want to refresh inode->i_size, 972 * because we may have cached data 973 */ 974 flags = (v9ses->cache & CACHE_LOOSE) ? 975 V9FS_STAT2INODE_KEEP_ISIZE : 0; 976 v9fs_stat2inode_dotl(st, inode, flags); 977 out: 978 kfree(st); 979 return 0; 980 } 981 982 const struct inode_operations v9fs_dir_inode_operations_dotl = { 983 .create = v9fs_vfs_create_dotl, 984 .atomic_open = v9fs_vfs_atomic_open_dotl, 985 .lookup = v9fs_vfs_lookup, 986 .link = v9fs_vfs_link_dotl, 987 .symlink = v9fs_vfs_symlink_dotl, 988 .unlink = v9fs_vfs_unlink, 989 .mkdir = v9fs_vfs_mkdir_dotl, 990 .rmdir = v9fs_vfs_rmdir, 991 .mknod = v9fs_vfs_mknod_dotl, 992 .rename = v9fs_vfs_rename, 993 .getattr = v9fs_vfs_getattr_dotl, 994 .setattr = v9fs_vfs_setattr_dotl, 995 .listxattr = v9fs_listxattr, 996 .get_inode_acl = v9fs_iop_get_inode_acl, 997 .get_acl = v9fs_iop_get_acl, 998 .set_acl = v9fs_iop_set_acl, 999 }; 1000 1001 const struct inode_operations v9fs_file_inode_operations_dotl = { 1002 .getattr = v9fs_vfs_getattr_dotl, 1003 .setattr = v9fs_vfs_setattr_dotl, 1004 .listxattr = v9fs_listxattr, 1005 .get_inode_acl = v9fs_iop_get_inode_acl, 1006 .get_acl = v9fs_iop_get_acl, 1007 .set_acl = v9fs_iop_set_acl, 1008 }; 1009 1010 const struct inode_operations v9fs_symlink_inode_operations_dotl = { 1011 .get_link = v9fs_vfs_get_link_dotl, 1012 .getattr = v9fs_vfs_getattr_dotl, 1013 .setattr = v9fs_vfs_setattr_dotl, 1014 .listxattr = v9fs_listxattr, 1015 }; 1016