1 /* 2 * linux/fs/9p/vfs_inode_dotl.c 3 * 4 * This file contains vfs inode ops for the 9P2000.L protocol. 5 * 6 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> 7 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 11 * as published by the Free Software Foundation. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to: 20 * Free Software Foundation 21 * 51 Franklin Street, Fifth Floor 22 * Boston, MA 02111-1301 USA 23 * 24 */ 25 26 #include <linux/module.h> 27 #include <linux/errno.h> 28 #include <linux/fs.h> 29 #include <linux/file.h> 30 #include <linux/pagemap.h> 31 #include <linux/stat.h> 32 #include <linux/string.h> 33 #include <linux/inet.h> 34 #include <linux/namei.h> 35 #include <linux/idr.h> 36 #include <linux/sched.h> 37 #include <linux/slab.h> 38 #include <linux/xattr.h> 39 #include <linux/posix_acl.h> 40 #include <net/9p/9p.h> 41 #include <net/9p/client.h> 42 43 #include "v9fs.h" 44 #include "v9fs_vfs.h" 45 #include "fid.h" 46 #include "cache.h" 47 #include "xattr.h" 48 #include "acl.h" 49 50 static int 51 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode, 52 dev_t rdev); 53 54 /** 55 * v9fs_get_fsgid_for_create - Helper function to get the gid for creating a 56 * new file system object. This checks the S_ISGID to determine the owning 57 * group of the new file system object. 58 */ 59 60 static kgid_t v9fs_get_fsgid_for_create(struct inode *dir_inode) 61 { 62 BUG_ON(dir_inode == NULL); 63 64 if (dir_inode->i_mode & S_ISGID) { 65 /* set_gid bit is set.*/ 66 return dir_inode->i_gid; 67 } 68 return current_fsgid(); 69 } 70 71 static int v9fs_test_inode_dotl(struct inode *inode, void *data) 72 { 73 struct v9fs_inode *v9inode = V9FS_I(inode); 74 struct p9_stat_dotl *st = (struct p9_stat_dotl *)data; 75 76 /* don't match inode of different type */ 77 if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT)) 78 return 0; 79 80 if (inode->i_generation != st->st_gen) 81 return 0; 82 83 /* compare qid details */ 84 if (memcmp(&v9inode->qid.version, 85 &st->qid.version, sizeof(v9inode->qid.version))) 86 return 0; 87 88 if (v9inode->qid.type != st->qid.type) 89 return 0; 90 return 1; 91 } 92 93 /* Always get a new inode */ 94 static int v9fs_test_new_inode_dotl(struct inode *inode, void *data) 95 { 96 return 0; 97 } 98 99 static int v9fs_set_inode_dotl(struct inode *inode, void *data) 100 { 101 struct v9fs_inode *v9inode = V9FS_I(inode); 102 struct p9_stat_dotl *st = (struct p9_stat_dotl *)data; 103 104 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid)); 105 inode->i_generation = st->st_gen; 106 return 0; 107 } 108 109 static struct inode *v9fs_qid_iget_dotl(struct super_block *sb, 110 struct p9_qid *qid, 111 struct p9_fid *fid, 112 struct p9_stat_dotl *st, 113 int new) 114 { 115 int retval; 116 unsigned long i_ino; 117 struct inode *inode; 118 struct v9fs_session_info *v9ses = sb->s_fs_info; 119 int (*test)(struct inode *, void *); 120 121 if (new) 122 test = v9fs_test_new_inode_dotl; 123 else 124 test = v9fs_test_inode_dotl; 125 126 i_ino = v9fs_qid2ino(qid); 127 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode_dotl, st); 128 if (!inode) 129 return ERR_PTR(-ENOMEM); 130 if (!(inode->i_state & I_NEW)) 131 return inode; 132 /* 133 * initialize the inode with the stat info 134 * FIXME!! we may need support for stale inodes 135 * later. 136 */ 137 inode->i_ino = i_ino; 138 retval = v9fs_init_inode(v9ses, inode, 139 st->st_mode, new_decode_dev(st->st_rdev)); 140 if (retval) 141 goto error; 142 143 v9fs_stat2inode_dotl(st, inode); 144 v9fs_cache_inode_get_cookie(inode); 145 retval = v9fs_get_acl(inode, fid); 146 if (retval) 147 goto error; 148 149 unlock_new_inode(inode); 150 return inode; 151 error: 152 iget_failed(inode); 153 return ERR_PTR(retval); 154 155 } 156 157 struct inode * 158 v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid, 159 struct super_block *sb, int new) 160 { 161 struct p9_stat_dotl *st; 162 struct inode *inode = NULL; 163 164 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN); 165 if (IS_ERR(st)) 166 return ERR_CAST(st); 167 168 inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st, new); 169 kfree(st); 170 return inode; 171 } 172 173 struct dotl_openflag_map { 174 int open_flag; 175 int dotl_flag; 176 }; 177 178 static int v9fs_mapped_dotl_flags(int flags) 179 { 180 int i; 181 int rflags = 0; 182 struct dotl_openflag_map dotl_oflag_map[] = { 183 { O_CREAT, P9_DOTL_CREATE }, 184 { O_EXCL, P9_DOTL_EXCL }, 185 { O_NOCTTY, P9_DOTL_NOCTTY }, 186 { O_APPEND, P9_DOTL_APPEND }, 187 { O_NONBLOCK, P9_DOTL_NONBLOCK }, 188 { O_DSYNC, P9_DOTL_DSYNC }, 189 { FASYNC, P9_DOTL_FASYNC }, 190 { O_DIRECT, P9_DOTL_DIRECT }, 191 { O_LARGEFILE, P9_DOTL_LARGEFILE }, 192 { O_DIRECTORY, P9_DOTL_DIRECTORY }, 193 { O_NOFOLLOW, P9_DOTL_NOFOLLOW }, 194 { O_NOATIME, P9_DOTL_NOATIME }, 195 { O_CLOEXEC, P9_DOTL_CLOEXEC }, 196 { O_SYNC, P9_DOTL_SYNC}, 197 }; 198 for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) { 199 if (flags & dotl_oflag_map[i].open_flag) 200 rflags |= dotl_oflag_map[i].dotl_flag; 201 } 202 return rflags; 203 } 204 205 /** 206 * v9fs_open_to_dotl_flags- convert Linux specific open flags to 207 * plan 9 open flag. 208 * @flags: flags to convert 209 */ 210 int v9fs_open_to_dotl_flags(int flags) 211 { 212 int rflags = 0; 213 214 /* 215 * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY 216 * and P9_DOTL_NOACCESS 217 */ 218 rflags |= flags & O_ACCMODE; 219 rflags |= v9fs_mapped_dotl_flags(flags); 220 221 return rflags; 222 } 223 224 /** 225 * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol. 226 * @dir: directory inode that is being created 227 * @dentry: dentry that is being deleted 228 * @omode: create permissions 229 * 230 */ 231 232 static int 233 v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, umode_t omode, 234 bool excl) 235 { 236 return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0); 237 } 238 239 static int 240 v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry, 241 struct file *file, unsigned flags, umode_t omode, 242 int *opened) 243 { 244 int err = 0; 245 kgid_t gid; 246 umode_t mode; 247 const unsigned char *name = NULL; 248 struct p9_qid qid; 249 struct inode *inode; 250 struct p9_fid *fid = NULL; 251 struct v9fs_inode *v9inode; 252 struct p9_fid *dfid, *ofid, *inode_fid; 253 struct v9fs_session_info *v9ses; 254 struct posix_acl *pacl = NULL, *dacl = NULL; 255 struct dentry *res = NULL; 256 257 if (d_in_lookup(dentry)) { 258 res = v9fs_vfs_lookup(dir, dentry, 0); 259 if (IS_ERR(res)) 260 return PTR_ERR(res); 261 262 if (res) 263 dentry = res; 264 } 265 266 /* Only creates */ 267 if (!(flags & O_CREAT) || d_really_is_positive(dentry)) 268 return finish_no_open(file, res); 269 270 v9ses = v9fs_inode2v9ses(dir); 271 272 name = dentry->d_name.name; 273 p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%hx\n", 274 name, flags, omode); 275 276 dfid = v9fs_parent_fid(dentry); 277 if (IS_ERR(dfid)) { 278 err = PTR_ERR(dfid); 279 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 280 goto out; 281 } 282 283 /* clone a fid to use for creation */ 284 ofid = clone_fid(dfid); 285 if (IS_ERR(ofid)) { 286 err = PTR_ERR(ofid); 287 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 288 goto out; 289 } 290 291 gid = v9fs_get_fsgid_for_create(dir); 292 293 mode = omode; 294 /* Update mode based on ACL value */ 295 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); 296 if (err) { 297 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in creat %d\n", 298 err); 299 goto error; 300 } 301 err = p9_client_create_dotl(ofid, name, v9fs_open_to_dotl_flags(flags), 302 mode, gid, &qid); 303 if (err < 0) { 304 p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in creat %d\n", 305 err); 306 goto error; 307 } 308 v9fs_invalidate_inode_attr(dir); 309 310 /* instantiate inode and assign the unopened fid to the dentry */ 311 fid = p9_client_walk(dfid, 1, &name, 1); 312 if (IS_ERR(fid)) { 313 err = PTR_ERR(fid); 314 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 315 fid = NULL; 316 goto error; 317 } 318 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 319 if (IS_ERR(inode)) { 320 err = PTR_ERR(inode); 321 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err); 322 goto error; 323 } 324 /* Now set the ACL based on the default value */ 325 v9fs_set_create_acl(inode, fid, dacl, pacl); 326 327 v9fs_fid_add(dentry, fid); 328 d_instantiate(dentry, inode); 329 330 v9inode = V9FS_I(inode); 331 mutex_lock(&v9inode->v_mutex); 332 if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) && 333 !v9inode->writeback_fid && 334 ((flags & O_ACCMODE) != O_RDONLY)) { 335 /* 336 * clone a fid and add it to writeback_fid 337 * we do it during open time instead of 338 * page dirty time via write_begin/page_mkwrite 339 * because we want write after unlink usecase 340 * to work. 341 */ 342 inode_fid = v9fs_writeback_fid(dentry); 343 if (IS_ERR(inode_fid)) { 344 err = PTR_ERR(inode_fid); 345 mutex_unlock(&v9inode->v_mutex); 346 goto err_clunk_old_fid; 347 } 348 v9inode->writeback_fid = (void *) inode_fid; 349 } 350 mutex_unlock(&v9inode->v_mutex); 351 /* Since we are opening a file, assign the open fid to the file */ 352 err = finish_open(file, dentry, generic_file_open, opened); 353 if (err) 354 goto err_clunk_old_fid; 355 file->private_data = ofid; 356 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) 357 v9fs_cache_inode_set_cookie(inode, file); 358 *opened |= FILE_CREATED; 359 out: 360 v9fs_put_acl(dacl, pacl); 361 dput(res); 362 return err; 363 364 error: 365 if (fid) 366 p9_client_clunk(fid); 367 err_clunk_old_fid: 368 if (ofid) 369 p9_client_clunk(ofid); 370 goto out; 371 } 372 373 /** 374 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory 375 * @dir: inode that is being unlinked 376 * @dentry: dentry that is being unlinked 377 * @omode: mode for new directory 378 * 379 */ 380 381 static int v9fs_vfs_mkdir_dotl(struct inode *dir, 382 struct dentry *dentry, umode_t omode) 383 { 384 int err; 385 struct v9fs_session_info *v9ses; 386 struct p9_fid *fid = NULL, *dfid = NULL; 387 kgid_t gid; 388 const unsigned char *name; 389 umode_t mode; 390 struct inode *inode; 391 struct p9_qid qid; 392 struct posix_acl *dacl = NULL, *pacl = NULL; 393 394 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry); 395 err = 0; 396 v9ses = v9fs_inode2v9ses(dir); 397 398 omode |= S_IFDIR; 399 if (dir->i_mode & S_ISGID) 400 omode |= S_ISGID; 401 402 dfid = v9fs_parent_fid(dentry); 403 if (IS_ERR(dfid)) { 404 err = PTR_ERR(dfid); 405 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 406 dfid = NULL; 407 goto error; 408 } 409 410 gid = v9fs_get_fsgid_for_create(dir); 411 mode = omode; 412 /* Update mode based on ACL value */ 413 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); 414 if (err) { 415 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n", 416 err); 417 goto error; 418 } 419 name = dentry->d_name.name; 420 err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid); 421 if (err < 0) 422 goto error; 423 424 fid = p9_client_walk(dfid, 1, &name, 1); 425 if (IS_ERR(fid)) { 426 err = PTR_ERR(fid); 427 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", 428 err); 429 fid = NULL; 430 goto error; 431 } 432 433 /* instantiate inode and assign the unopened fid to the dentry */ 434 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 435 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 436 if (IS_ERR(inode)) { 437 err = PTR_ERR(inode); 438 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", 439 err); 440 goto error; 441 } 442 v9fs_fid_add(dentry, fid); 443 v9fs_set_create_acl(inode, fid, dacl, pacl); 444 d_instantiate(dentry, inode); 445 fid = NULL; 446 err = 0; 447 } else { 448 /* 449 * Not in cached mode. No need to populate 450 * inode with stat. We need to get an inode 451 * so that we can set the acl with dentry 452 */ 453 inode = v9fs_get_inode(dir->i_sb, mode, 0); 454 if (IS_ERR(inode)) { 455 err = PTR_ERR(inode); 456 goto error; 457 } 458 v9fs_set_create_acl(inode, fid, dacl, pacl); 459 d_instantiate(dentry, inode); 460 } 461 inc_nlink(dir); 462 v9fs_invalidate_inode_attr(dir); 463 error: 464 if (fid) 465 p9_client_clunk(fid); 466 v9fs_put_acl(dacl, pacl); 467 return err; 468 } 469 470 static int 471 v9fs_vfs_getattr_dotl(const struct path *path, struct kstat *stat, 472 u32 request_mask, unsigned int flags) 473 { 474 struct dentry *dentry = path->dentry; 475 struct v9fs_session_info *v9ses; 476 struct p9_fid *fid; 477 struct p9_stat_dotl *st; 478 479 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry); 480 v9ses = v9fs_dentry2v9ses(dentry); 481 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 482 generic_fillattr(d_inode(dentry), stat); 483 return 0; 484 } 485 fid = v9fs_fid_lookup(dentry); 486 if (IS_ERR(fid)) 487 return PTR_ERR(fid); 488 489 /* Ask for all the fields in stat structure. Server will return 490 * whatever it supports 491 */ 492 493 st = p9_client_getattr_dotl(fid, P9_STATS_ALL); 494 if (IS_ERR(st)) 495 return PTR_ERR(st); 496 497 v9fs_stat2inode_dotl(st, d_inode(dentry)); 498 generic_fillattr(d_inode(dentry), stat); 499 /* Change block size to what the server returned */ 500 stat->blksize = st->st_blksize; 501 502 kfree(st); 503 return 0; 504 } 505 506 /* 507 * Attribute flags. 508 */ 509 #define P9_ATTR_MODE (1 << 0) 510 #define P9_ATTR_UID (1 << 1) 511 #define P9_ATTR_GID (1 << 2) 512 #define P9_ATTR_SIZE (1 << 3) 513 #define P9_ATTR_ATIME (1 << 4) 514 #define P9_ATTR_MTIME (1 << 5) 515 #define P9_ATTR_CTIME (1 << 6) 516 #define P9_ATTR_ATIME_SET (1 << 7) 517 #define P9_ATTR_MTIME_SET (1 << 8) 518 519 struct dotl_iattr_map { 520 int iattr_valid; 521 int p9_iattr_valid; 522 }; 523 524 static int v9fs_mapped_iattr_valid(int iattr_valid) 525 { 526 int i; 527 int p9_iattr_valid = 0; 528 struct dotl_iattr_map dotl_iattr_map[] = { 529 { ATTR_MODE, P9_ATTR_MODE }, 530 { ATTR_UID, P9_ATTR_UID }, 531 { ATTR_GID, P9_ATTR_GID }, 532 { ATTR_SIZE, P9_ATTR_SIZE }, 533 { ATTR_ATIME, P9_ATTR_ATIME }, 534 { ATTR_MTIME, P9_ATTR_MTIME }, 535 { ATTR_CTIME, P9_ATTR_CTIME }, 536 { ATTR_ATIME_SET, P9_ATTR_ATIME_SET }, 537 { ATTR_MTIME_SET, P9_ATTR_MTIME_SET }, 538 }; 539 for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) { 540 if (iattr_valid & dotl_iattr_map[i].iattr_valid) 541 p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid; 542 } 543 return p9_iattr_valid; 544 } 545 546 /** 547 * v9fs_vfs_setattr_dotl - set file metadata 548 * @dentry: file whose metadata to set 549 * @iattr: metadata assignment structure 550 * 551 */ 552 553 int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr) 554 { 555 int retval; 556 struct p9_fid *fid; 557 struct p9_iattr_dotl p9attr; 558 struct inode *inode = d_inode(dentry); 559 560 p9_debug(P9_DEBUG_VFS, "\n"); 561 562 retval = setattr_prepare(dentry, iattr); 563 if (retval) 564 return retval; 565 566 p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid); 567 p9attr.mode = iattr->ia_mode; 568 p9attr.uid = iattr->ia_uid; 569 p9attr.gid = iattr->ia_gid; 570 p9attr.size = iattr->ia_size; 571 p9attr.atime_sec = iattr->ia_atime.tv_sec; 572 p9attr.atime_nsec = iattr->ia_atime.tv_nsec; 573 p9attr.mtime_sec = iattr->ia_mtime.tv_sec; 574 p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec; 575 576 fid = v9fs_fid_lookup(dentry); 577 if (IS_ERR(fid)) 578 return PTR_ERR(fid); 579 580 /* Write all dirty data */ 581 if (S_ISREG(inode->i_mode)) 582 filemap_write_and_wait(inode->i_mapping); 583 584 retval = p9_client_setattr(fid, &p9attr); 585 if (retval < 0) 586 return retval; 587 588 if ((iattr->ia_valid & ATTR_SIZE) && 589 iattr->ia_size != i_size_read(inode)) 590 truncate_setsize(inode, iattr->ia_size); 591 592 v9fs_invalidate_inode_attr(inode); 593 setattr_copy(inode, iattr); 594 mark_inode_dirty(inode); 595 if (iattr->ia_valid & ATTR_MODE) { 596 /* We also want to update ACL when we update mode bits */ 597 retval = v9fs_acl_chmod(inode, fid); 598 if (retval < 0) 599 return retval; 600 } 601 return 0; 602 } 603 604 /** 605 * v9fs_stat2inode_dotl - populate an inode structure with stat info 606 * @stat: stat structure 607 * @inode: inode to populate 608 * 609 */ 610 611 void 612 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode) 613 { 614 umode_t mode; 615 struct v9fs_inode *v9inode = V9FS_I(inode); 616 617 if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) { 618 inode->i_atime.tv_sec = stat->st_atime_sec; 619 inode->i_atime.tv_nsec = stat->st_atime_nsec; 620 inode->i_mtime.tv_sec = stat->st_mtime_sec; 621 inode->i_mtime.tv_nsec = stat->st_mtime_nsec; 622 inode->i_ctime.tv_sec = stat->st_ctime_sec; 623 inode->i_ctime.tv_nsec = stat->st_ctime_nsec; 624 inode->i_uid = stat->st_uid; 625 inode->i_gid = stat->st_gid; 626 set_nlink(inode, stat->st_nlink); 627 628 mode = stat->st_mode & S_IALLUGO; 629 mode |= inode->i_mode & ~S_IALLUGO; 630 inode->i_mode = mode; 631 632 i_size_write(inode, stat->st_size); 633 inode->i_blocks = stat->st_blocks; 634 } else { 635 if (stat->st_result_mask & P9_STATS_ATIME) { 636 inode->i_atime.tv_sec = stat->st_atime_sec; 637 inode->i_atime.tv_nsec = stat->st_atime_nsec; 638 } 639 if (stat->st_result_mask & P9_STATS_MTIME) { 640 inode->i_mtime.tv_sec = stat->st_mtime_sec; 641 inode->i_mtime.tv_nsec = stat->st_mtime_nsec; 642 } 643 if (stat->st_result_mask & P9_STATS_CTIME) { 644 inode->i_ctime.tv_sec = stat->st_ctime_sec; 645 inode->i_ctime.tv_nsec = stat->st_ctime_nsec; 646 } 647 if (stat->st_result_mask & P9_STATS_UID) 648 inode->i_uid = stat->st_uid; 649 if (stat->st_result_mask & P9_STATS_GID) 650 inode->i_gid = stat->st_gid; 651 if (stat->st_result_mask & P9_STATS_NLINK) 652 set_nlink(inode, stat->st_nlink); 653 if (stat->st_result_mask & P9_STATS_MODE) { 654 inode->i_mode = stat->st_mode; 655 if ((S_ISBLK(inode->i_mode)) || 656 (S_ISCHR(inode->i_mode))) 657 init_special_inode(inode, inode->i_mode, 658 inode->i_rdev); 659 } 660 if (stat->st_result_mask & P9_STATS_RDEV) 661 inode->i_rdev = new_decode_dev(stat->st_rdev); 662 if (stat->st_result_mask & P9_STATS_SIZE) 663 i_size_write(inode, stat->st_size); 664 if (stat->st_result_mask & P9_STATS_BLOCKS) 665 inode->i_blocks = stat->st_blocks; 666 } 667 if (stat->st_result_mask & P9_STATS_GEN) 668 inode->i_generation = stat->st_gen; 669 670 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION 671 * because the inode structure does not have fields for them. 672 */ 673 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR; 674 } 675 676 static int 677 v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry, 678 const char *symname) 679 { 680 int err; 681 kgid_t gid; 682 const unsigned char *name; 683 struct p9_qid qid; 684 struct inode *inode; 685 struct p9_fid *dfid; 686 struct p9_fid *fid = NULL; 687 struct v9fs_session_info *v9ses; 688 689 name = dentry->d_name.name; 690 p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname); 691 v9ses = v9fs_inode2v9ses(dir); 692 693 dfid = v9fs_parent_fid(dentry); 694 if (IS_ERR(dfid)) { 695 err = PTR_ERR(dfid); 696 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 697 return err; 698 } 699 700 gid = v9fs_get_fsgid_for_create(dir); 701 702 /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */ 703 err = p9_client_symlink(dfid, name, symname, gid, &qid); 704 705 if (err < 0) { 706 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err); 707 goto error; 708 } 709 710 v9fs_invalidate_inode_attr(dir); 711 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 712 /* Now walk from the parent so we can get an unopened fid. */ 713 fid = p9_client_walk(dfid, 1, &name, 1); 714 if (IS_ERR(fid)) { 715 err = PTR_ERR(fid); 716 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", 717 err); 718 fid = NULL; 719 goto error; 720 } 721 722 /* instantiate inode and assign the unopened fid to dentry */ 723 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 724 if (IS_ERR(inode)) { 725 err = PTR_ERR(inode); 726 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", 727 err); 728 goto error; 729 } 730 v9fs_fid_add(dentry, fid); 731 d_instantiate(dentry, inode); 732 fid = NULL; 733 err = 0; 734 } else { 735 /* Not in cached mode. No need to populate inode with stat */ 736 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0); 737 if (IS_ERR(inode)) { 738 err = PTR_ERR(inode); 739 goto error; 740 } 741 d_instantiate(dentry, inode); 742 } 743 744 error: 745 if (fid) 746 p9_client_clunk(fid); 747 748 return err; 749 } 750 751 /** 752 * v9fs_vfs_link_dotl - create a hardlink for dotl 753 * @old_dentry: dentry for file to link to 754 * @dir: inode destination for new link 755 * @dentry: dentry for link 756 * 757 */ 758 759 static int 760 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir, 761 struct dentry *dentry) 762 { 763 int err; 764 struct p9_fid *dfid, *oldfid; 765 struct v9fs_session_info *v9ses; 766 767 p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %pd, new_name: %pd\n", 768 dir->i_ino, old_dentry, dentry); 769 770 v9ses = v9fs_inode2v9ses(dir); 771 dfid = v9fs_parent_fid(dentry); 772 if (IS_ERR(dfid)) 773 return PTR_ERR(dfid); 774 775 oldfid = v9fs_fid_lookup(old_dentry); 776 if (IS_ERR(oldfid)) 777 return PTR_ERR(oldfid); 778 779 err = p9_client_link(dfid, oldfid, dentry->d_name.name); 780 781 if (err < 0) { 782 p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err); 783 return err; 784 } 785 786 v9fs_invalidate_inode_attr(dir); 787 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 788 /* Get the latest stat info from server. */ 789 struct p9_fid *fid; 790 fid = v9fs_fid_lookup(old_dentry); 791 if (IS_ERR(fid)) 792 return PTR_ERR(fid); 793 794 v9fs_refresh_inode_dotl(fid, d_inode(old_dentry)); 795 } 796 ihold(d_inode(old_dentry)); 797 d_instantiate(dentry, d_inode(old_dentry)); 798 799 return err; 800 } 801 802 /** 803 * v9fs_vfs_mknod_dotl - create a special file 804 * @dir: inode destination for new link 805 * @dentry: dentry for file 806 * @omode: mode for creation 807 * @rdev: device associated with special file 808 * 809 */ 810 static int 811 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode, 812 dev_t rdev) 813 { 814 int err; 815 kgid_t gid; 816 const unsigned char *name; 817 umode_t mode; 818 struct v9fs_session_info *v9ses; 819 struct p9_fid *fid = NULL, *dfid = NULL; 820 struct inode *inode; 821 struct p9_qid qid; 822 struct posix_acl *dacl = NULL, *pacl = NULL; 823 824 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %hx MAJOR: %u MINOR: %u\n", 825 dir->i_ino, dentry, omode, 826 MAJOR(rdev), MINOR(rdev)); 827 828 v9ses = v9fs_inode2v9ses(dir); 829 dfid = v9fs_parent_fid(dentry); 830 if (IS_ERR(dfid)) { 831 err = PTR_ERR(dfid); 832 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 833 dfid = NULL; 834 goto error; 835 } 836 837 gid = v9fs_get_fsgid_for_create(dir); 838 mode = omode; 839 /* Update mode based on ACL value */ 840 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); 841 if (err) { 842 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n", 843 err); 844 goto error; 845 } 846 name = dentry->d_name.name; 847 848 err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid); 849 if (err < 0) 850 goto error; 851 852 v9fs_invalidate_inode_attr(dir); 853 fid = p9_client_walk(dfid, 1, &name, 1); 854 if (IS_ERR(fid)) { 855 err = PTR_ERR(fid); 856 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", 857 err); 858 fid = NULL; 859 goto error; 860 } 861 862 /* instantiate inode and assign the unopened fid to the dentry */ 863 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 864 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 865 if (IS_ERR(inode)) { 866 err = PTR_ERR(inode); 867 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", 868 err); 869 goto error; 870 } 871 v9fs_set_create_acl(inode, fid, dacl, pacl); 872 v9fs_fid_add(dentry, fid); 873 d_instantiate(dentry, inode); 874 fid = NULL; 875 err = 0; 876 } else { 877 /* 878 * Not in cached mode. No need to populate inode with stat. 879 * socket syscall returns a fd, so we need instantiate 880 */ 881 inode = v9fs_get_inode(dir->i_sb, mode, rdev); 882 if (IS_ERR(inode)) { 883 err = PTR_ERR(inode); 884 goto error; 885 } 886 v9fs_set_create_acl(inode, fid, dacl, pacl); 887 d_instantiate(dentry, inode); 888 } 889 error: 890 if (fid) 891 p9_client_clunk(fid); 892 v9fs_put_acl(dacl, pacl); 893 return err; 894 } 895 896 /** 897 * v9fs_vfs_get_link_dotl - follow a symlink path 898 * @dentry: dentry for symlink 899 * @inode: inode for symlink 900 * @done: destructor for return value 901 */ 902 903 static const char * 904 v9fs_vfs_get_link_dotl(struct dentry *dentry, 905 struct inode *inode, 906 struct delayed_call *done) 907 { 908 struct p9_fid *fid; 909 char *target; 910 int retval; 911 912 if (!dentry) 913 return ERR_PTR(-ECHILD); 914 915 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry); 916 917 fid = v9fs_fid_lookup(dentry); 918 if (IS_ERR(fid)) 919 return ERR_CAST(fid); 920 retval = p9_client_readlink(fid, &target); 921 if (retval) 922 return ERR_PTR(retval); 923 set_delayed_call(done, kfree_link, target); 924 return target; 925 } 926 927 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode) 928 { 929 loff_t i_size; 930 struct p9_stat_dotl *st; 931 struct v9fs_session_info *v9ses; 932 933 v9ses = v9fs_inode2v9ses(inode); 934 st = p9_client_getattr_dotl(fid, P9_STATS_ALL); 935 if (IS_ERR(st)) 936 return PTR_ERR(st); 937 /* 938 * Don't update inode if the file type is different 939 */ 940 if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT)) 941 goto out; 942 943 spin_lock(&inode->i_lock); 944 /* 945 * We don't want to refresh inode->i_size, 946 * because we may have cached data 947 */ 948 i_size = inode->i_size; 949 v9fs_stat2inode_dotl(st, inode); 950 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) 951 inode->i_size = i_size; 952 spin_unlock(&inode->i_lock); 953 out: 954 kfree(st); 955 return 0; 956 } 957 958 const struct inode_operations v9fs_dir_inode_operations_dotl = { 959 .create = v9fs_vfs_create_dotl, 960 .atomic_open = v9fs_vfs_atomic_open_dotl, 961 .lookup = v9fs_vfs_lookup, 962 .link = v9fs_vfs_link_dotl, 963 .symlink = v9fs_vfs_symlink_dotl, 964 .unlink = v9fs_vfs_unlink, 965 .mkdir = v9fs_vfs_mkdir_dotl, 966 .rmdir = v9fs_vfs_rmdir, 967 .mknod = v9fs_vfs_mknod_dotl, 968 .rename = v9fs_vfs_rename, 969 .getattr = v9fs_vfs_getattr_dotl, 970 .setattr = v9fs_vfs_setattr_dotl, 971 .listxattr = v9fs_listxattr, 972 .get_acl = v9fs_iop_get_acl, 973 }; 974 975 const struct inode_operations v9fs_file_inode_operations_dotl = { 976 .getattr = v9fs_vfs_getattr_dotl, 977 .setattr = v9fs_vfs_setattr_dotl, 978 .listxattr = v9fs_listxattr, 979 .get_acl = v9fs_iop_get_acl, 980 }; 981 982 const struct inode_operations v9fs_symlink_inode_operations_dotl = { 983 .get_link = v9fs_vfs_get_link_dotl, 984 .getattr = v9fs_vfs_getattr_dotl, 985 .setattr = v9fs_vfs_setattr_dotl, 986 .listxattr = v9fs_listxattr, 987 }; 988