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 unlock_new_inode(inode); 153 iput(inode); 154 return ERR_PTR(retval); 155 156 } 157 158 struct inode * 159 v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid, 160 struct super_block *sb, int new) 161 { 162 struct p9_stat_dotl *st; 163 struct inode *inode = NULL; 164 165 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN); 166 if (IS_ERR(st)) 167 return ERR_CAST(st); 168 169 inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st, new); 170 kfree(st); 171 return inode; 172 } 173 174 struct dotl_openflag_map { 175 int open_flag; 176 int dotl_flag; 177 }; 178 179 static int v9fs_mapped_dotl_flags(int flags) 180 { 181 int i; 182 int rflags = 0; 183 struct dotl_openflag_map dotl_oflag_map[] = { 184 { O_CREAT, P9_DOTL_CREATE }, 185 { O_EXCL, P9_DOTL_EXCL }, 186 { O_NOCTTY, P9_DOTL_NOCTTY }, 187 { O_APPEND, P9_DOTL_APPEND }, 188 { O_NONBLOCK, P9_DOTL_NONBLOCK }, 189 { O_DSYNC, P9_DOTL_DSYNC }, 190 { FASYNC, P9_DOTL_FASYNC }, 191 { O_DIRECT, P9_DOTL_DIRECT }, 192 { O_LARGEFILE, P9_DOTL_LARGEFILE }, 193 { O_DIRECTORY, P9_DOTL_DIRECTORY }, 194 { O_NOFOLLOW, P9_DOTL_NOFOLLOW }, 195 { O_NOATIME, P9_DOTL_NOATIME }, 196 { O_CLOEXEC, P9_DOTL_CLOEXEC }, 197 { O_SYNC, P9_DOTL_SYNC}, 198 }; 199 for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) { 200 if (flags & dotl_oflag_map[i].open_flag) 201 rflags |= dotl_oflag_map[i].dotl_flag; 202 } 203 return rflags; 204 } 205 206 /** 207 * v9fs_open_to_dotl_flags- convert Linux specific open flags to 208 * plan 9 open flag. 209 * @flags: flags to convert 210 */ 211 int v9fs_open_to_dotl_flags(int flags) 212 { 213 int rflags = 0; 214 215 /* 216 * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY 217 * and P9_DOTL_NOACCESS 218 */ 219 rflags |= flags & O_ACCMODE; 220 rflags |= v9fs_mapped_dotl_flags(flags); 221 222 return rflags; 223 } 224 225 /** 226 * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol. 227 * @dir: directory inode that is being created 228 * @dentry: dentry that is being deleted 229 * @omode: create permissions 230 * 231 */ 232 233 static int 234 v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, umode_t omode, 235 bool excl) 236 { 237 return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0); 238 } 239 240 static int 241 v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry, 242 struct file *file, unsigned flags, umode_t omode, 243 int *opened) 244 { 245 int err = 0; 246 kgid_t gid; 247 umode_t mode; 248 char *name = NULL; 249 struct p9_qid qid; 250 struct inode *inode; 251 struct p9_fid *fid = NULL; 252 struct v9fs_inode *v9inode; 253 struct p9_fid *dfid, *ofid, *inode_fid; 254 struct v9fs_session_info *v9ses; 255 struct posix_acl *pacl = NULL, *dacl = NULL; 256 struct dentry *res = NULL; 257 258 if (d_unhashed(dentry)) { 259 res = v9fs_vfs_lookup(dir, dentry, 0); 260 if (IS_ERR(res)) 261 return PTR_ERR(res); 262 263 if (res) 264 dentry = res; 265 } 266 267 /* Only creates */ 268 if (!(flags & O_CREAT) || dentry->d_inode) 269 return finish_no_open(file, res); 270 271 v9ses = v9fs_inode2v9ses(dir); 272 273 name = (char *) dentry->d_name.name; 274 p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%hx\n", 275 name, flags, omode); 276 277 dfid = v9fs_fid_lookup(dentry->d_parent); 278 if (IS_ERR(dfid)) { 279 err = PTR_ERR(dfid); 280 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 281 goto out; 282 } 283 284 /* clone a fid to use for creation */ 285 ofid = p9_client_walk(dfid, 0, NULL, 1); 286 if (IS_ERR(ofid)) { 287 err = PTR_ERR(ofid); 288 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 289 goto out; 290 } 291 292 gid = v9fs_get_fsgid_for_create(dir); 293 294 mode = omode; 295 /* Update mode based on ACL value */ 296 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); 297 if (err) { 298 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in creat %d\n", 299 err); 300 goto error; 301 } 302 err = p9_client_create_dotl(ofid, name, v9fs_open_to_dotl_flags(flags), 303 mode, gid, &qid); 304 if (err < 0) { 305 p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in creat %d\n", 306 err); 307 goto error; 308 } 309 v9fs_invalidate_inode_attr(dir); 310 311 /* instantiate inode and assign the unopened fid to the dentry */ 312 fid = p9_client_walk(dfid, 1, &name, 1); 313 if (IS_ERR(fid)) { 314 err = PTR_ERR(fid); 315 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 316 fid = NULL; 317 goto error; 318 } 319 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 320 if (IS_ERR(inode)) { 321 err = PTR_ERR(inode); 322 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err); 323 goto error; 324 } 325 /* Now set the ACL based on the default value */ 326 v9fs_set_create_acl(inode, fid, dacl, pacl); 327 328 v9fs_fid_add(dentry, fid); 329 d_instantiate(dentry, inode); 330 331 v9inode = V9FS_I(inode); 332 mutex_lock(&v9inode->v_mutex); 333 if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) && 334 !v9inode->writeback_fid && 335 ((flags & O_ACCMODE) != O_RDONLY)) { 336 /* 337 * clone a fid and add it to writeback_fid 338 * we do it during open time instead of 339 * page dirty time via write_begin/page_mkwrite 340 * because we want write after unlink usecase 341 * to work. 342 */ 343 inode_fid = v9fs_writeback_fid(dentry); 344 if (IS_ERR(inode_fid)) { 345 err = PTR_ERR(inode_fid); 346 mutex_unlock(&v9inode->v_mutex); 347 goto err_clunk_old_fid; 348 } 349 v9inode->writeback_fid = (void *) inode_fid; 350 } 351 mutex_unlock(&v9inode->v_mutex); 352 /* Since we are opening a file, assign the open fid to the file */ 353 err = finish_open(file, dentry, generic_file_open, opened); 354 if (err) 355 goto err_clunk_old_fid; 356 file->private_data = ofid; 357 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) 358 v9fs_cache_inode_set_cookie(inode, file); 359 *opened |= FILE_CREATED; 360 out: 361 v9fs_put_acl(dacl, pacl); 362 dput(res); 363 return err; 364 365 error: 366 if (fid) 367 p9_client_clunk(fid); 368 err_clunk_old_fid: 369 if (ofid) 370 p9_client_clunk(ofid); 371 goto out; 372 } 373 374 /** 375 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory 376 * @dir: inode that is being unlinked 377 * @dentry: dentry that is being unlinked 378 * @omode: mode for new directory 379 * 380 */ 381 382 static int v9fs_vfs_mkdir_dotl(struct inode *dir, 383 struct dentry *dentry, umode_t omode) 384 { 385 int err; 386 struct v9fs_session_info *v9ses; 387 struct p9_fid *fid = NULL, *dfid = NULL; 388 kgid_t gid; 389 char *name; 390 umode_t mode; 391 struct inode *inode; 392 struct p9_qid qid; 393 struct dentry *dir_dentry; 394 struct posix_acl *dacl = NULL, *pacl = NULL; 395 396 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry); 397 err = 0; 398 v9ses = v9fs_inode2v9ses(dir); 399 400 omode |= S_IFDIR; 401 if (dir->i_mode & S_ISGID) 402 omode |= S_ISGID; 403 404 dir_dentry = dentry->d_parent; 405 dfid = v9fs_fid_lookup(dir_dentry); 406 if (IS_ERR(dfid)) { 407 err = PTR_ERR(dfid); 408 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 409 dfid = NULL; 410 goto error; 411 } 412 413 gid = v9fs_get_fsgid_for_create(dir); 414 mode = omode; 415 /* Update mode based on ACL value */ 416 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); 417 if (err) { 418 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n", 419 err); 420 goto error; 421 } 422 name = (char *) dentry->d_name.name; 423 err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid); 424 if (err < 0) 425 goto error; 426 427 fid = p9_client_walk(dfid, 1, &name, 1); 428 if (IS_ERR(fid)) { 429 err = PTR_ERR(fid); 430 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", 431 err); 432 fid = NULL; 433 goto error; 434 } 435 436 /* instantiate inode and assign the unopened fid to the dentry */ 437 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 438 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 439 if (IS_ERR(inode)) { 440 err = PTR_ERR(inode); 441 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", 442 err); 443 goto error; 444 } 445 v9fs_fid_add(dentry, fid); 446 v9fs_set_create_acl(inode, fid, dacl, pacl); 447 d_instantiate(dentry, inode); 448 fid = NULL; 449 err = 0; 450 } else { 451 /* 452 * Not in cached mode. No need to populate 453 * inode with stat. We need to get an inode 454 * so that we can set the acl with dentry 455 */ 456 inode = v9fs_get_inode(dir->i_sb, mode, 0); 457 if (IS_ERR(inode)) { 458 err = PTR_ERR(inode); 459 goto error; 460 } 461 v9fs_set_create_acl(inode, fid, dacl, pacl); 462 d_instantiate(dentry, inode); 463 } 464 inc_nlink(dir); 465 v9fs_invalidate_inode_attr(dir); 466 error: 467 if (fid) 468 p9_client_clunk(fid); 469 v9fs_put_acl(dacl, pacl); 470 return err; 471 } 472 473 static int 474 v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry, 475 struct kstat *stat) 476 { 477 struct v9fs_session_info *v9ses; 478 struct p9_fid *fid; 479 struct p9_stat_dotl *st; 480 481 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry); 482 v9ses = v9fs_dentry2v9ses(dentry); 483 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 484 generic_fillattr(dentry->d_inode, stat); 485 return 0; 486 } 487 fid = v9fs_fid_lookup(dentry); 488 if (IS_ERR(fid)) 489 return PTR_ERR(fid); 490 491 /* Ask for all the fields in stat structure. Server will return 492 * whatever it supports 493 */ 494 495 st = p9_client_getattr_dotl(fid, P9_STATS_ALL); 496 if (IS_ERR(st)) 497 return PTR_ERR(st); 498 499 v9fs_stat2inode_dotl(st, dentry->d_inode); 500 generic_fillattr(dentry->d_inode, stat); 501 /* Change block size to what the server returned */ 502 stat->blksize = st->st_blksize; 503 504 kfree(st); 505 return 0; 506 } 507 508 /* 509 * Attribute flags. 510 */ 511 #define P9_ATTR_MODE (1 << 0) 512 #define P9_ATTR_UID (1 << 1) 513 #define P9_ATTR_GID (1 << 2) 514 #define P9_ATTR_SIZE (1 << 3) 515 #define P9_ATTR_ATIME (1 << 4) 516 #define P9_ATTR_MTIME (1 << 5) 517 #define P9_ATTR_CTIME (1 << 6) 518 #define P9_ATTR_ATIME_SET (1 << 7) 519 #define P9_ATTR_MTIME_SET (1 << 8) 520 521 struct dotl_iattr_map { 522 int iattr_valid; 523 int p9_iattr_valid; 524 }; 525 526 static int v9fs_mapped_iattr_valid(int iattr_valid) 527 { 528 int i; 529 int p9_iattr_valid = 0; 530 struct dotl_iattr_map dotl_iattr_map[] = { 531 { ATTR_MODE, P9_ATTR_MODE }, 532 { ATTR_UID, P9_ATTR_UID }, 533 { ATTR_GID, P9_ATTR_GID }, 534 { ATTR_SIZE, P9_ATTR_SIZE }, 535 { ATTR_ATIME, P9_ATTR_ATIME }, 536 { ATTR_MTIME, P9_ATTR_MTIME }, 537 { ATTR_CTIME, P9_ATTR_CTIME }, 538 { ATTR_ATIME_SET, P9_ATTR_ATIME_SET }, 539 { ATTR_MTIME_SET, P9_ATTR_MTIME_SET }, 540 }; 541 for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) { 542 if (iattr_valid & dotl_iattr_map[i].iattr_valid) 543 p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid; 544 } 545 return p9_iattr_valid; 546 } 547 548 /** 549 * v9fs_vfs_setattr_dotl - set file metadata 550 * @dentry: file whose metadata to set 551 * @iattr: metadata assignment structure 552 * 553 */ 554 555 int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr) 556 { 557 int retval; 558 struct p9_fid *fid; 559 struct p9_iattr_dotl p9attr; 560 struct inode *inode = dentry->d_inode; 561 562 p9_debug(P9_DEBUG_VFS, "\n"); 563 564 retval = inode_change_ok(inode, iattr); 565 if (retval) 566 return retval; 567 568 p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid); 569 p9attr.mode = iattr->ia_mode; 570 p9attr.uid = iattr->ia_uid; 571 p9attr.gid = iattr->ia_gid; 572 p9attr.size = iattr->ia_size; 573 p9attr.atime_sec = iattr->ia_atime.tv_sec; 574 p9attr.atime_nsec = iattr->ia_atime.tv_nsec; 575 p9attr.mtime_sec = iattr->ia_mtime.tv_sec; 576 p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec; 577 578 fid = v9fs_fid_lookup(dentry); 579 if (IS_ERR(fid)) 580 return PTR_ERR(fid); 581 582 /* Write all dirty data */ 583 if (S_ISREG(inode->i_mode)) 584 filemap_write_and_wait(inode->i_mapping); 585 586 retval = p9_client_setattr(fid, &p9attr); 587 if (retval < 0) 588 return retval; 589 590 if ((iattr->ia_valid & ATTR_SIZE) && 591 iattr->ia_size != i_size_read(inode)) 592 truncate_setsize(inode, iattr->ia_size); 593 594 v9fs_invalidate_inode_attr(inode); 595 setattr_copy(inode, iattr); 596 mark_inode_dirty(inode); 597 if (iattr->ia_valid & ATTR_MODE) { 598 /* We also want to update ACL when we update mode bits */ 599 retval = v9fs_acl_chmod(inode, fid); 600 if (retval < 0) 601 return retval; 602 } 603 return 0; 604 } 605 606 /** 607 * v9fs_stat2inode_dotl - populate an inode structure with stat info 608 * @stat: stat structure 609 * @inode: inode to populate 610 * 611 */ 612 613 void 614 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode) 615 { 616 umode_t mode; 617 struct v9fs_inode *v9inode = V9FS_I(inode); 618 619 if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) { 620 inode->i_atime.tv_sec = stat->st_atime_sec; 621 inode->i_atime.tv_nsec = stat->st_atime_nsec; 622 inode->i_mtime.tv_sec = stat->st_mtime_sec; 623 inode->i_mtime.tv_nsec = stat->st_mtime_nsec; 624 inode->i_ctime.tv_sec = stat->st_ctime_sec; 625 inode->i_ctime.tv_nsec = stat->st_ctime_nsec; 626 inode->i_uid = stat->st_uid; 627 inode->i_gid = stat->st_gid; 628 set_nlink(inode, stat->st_nlink); 629 630 mode = stat->st_mode & S_IALLUGO; 631 mode |= inode->i_mode & ~S_IALLUGO; 632 inode->i_mode = mode; 633 634 i_size_write(inode, stat->st_size); 635 inode->i_blocks = stat->st_blocks; 636 } else { 637 if (stat->st_result_mask & P9_STATS_ATIME) { 638 inode->i_atime.tv_sec = stat->st_atime_sec; 639 inode->i_atime.tv_nsec = stat->st_atime_nsec; 640 } 641 if (stat->st_result_mask & P9_STATS_MTIME) { 642 inode->i_mtime.tv_sec = stat->st_mtime_sec; 643 inode->i_mtime.tv_nsec = stat->st_mtime_nsec; 644 } 645 if (stat->st_result_mask & P9_STATS_CTIME) { 646 inode->i_ctime.tv_sec = stat->st_ctime_sec; 647 inode->i_ctime.tv_nsec = stat->st_ctime_nsec; 648 } 649 if (stat->st_result_mask & P9_STATS_UID) 650 inode->i_uid = stat->st_uid; 651 if (stat->st_result_mask & P9_STATS_GID) 652 inode->i_gid = stat->st_gid; 653 if (stat->st_result_mask & P9_STATS_NLINK) 654 set_nlink(inode, stat->st_nlink); 655 if (stat->st_result_mask & P9_STATS_MODE) { 656 inode->i_mode = stat->st_mode; 657 if ((S_ISBLK(inode->i_mode)) || 658 (S_ISCHR(inode->i_mode))) 659 init_special_inode(inode, inode->i_mode, 660 inode->i_rdev); 661 } 662 if (stat->st_result_mask & P9_STATS_RDEV) 663 inode->i_rdev = new_decode_dev(stat->st_rdev); 664 if (stat->st_result_mask & P9_STATS_SIZE) 665 i_size_write(inode, stat->st_size); 666 if (stat->st_result_mask & P9_STATS_BLOCKS) 667 inode->i_blocks = stat->st_blocks; 668 } 669 if (stat->st_result_mask & P9_STATS_GEN) 670 inode->i_generation = stat->st_gen; 671 672 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION 673 * because the inode structure does not have fields for them. 674 */ 675 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR; 676 } 677 678 static int 679 v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry, 680 const char *symname) 681 { 682 int err; 683 kgid_t gid; 684 char *name; 685 struct p9_qid qid; 686 struct inode *inode; 687 struct p9_fid *dfid; 688 struct p9_fid *fid = NULL; 689 struct v9fs_session_info *v9ses; 690 691 name = (char *) dentry->d_name.name; 692 p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname); 693 v9ses = v9fs_inode2v9ses(dir); 694 695 dfid = v9fs_fid_lookup(dentry->d_parent); 696 if (IS_ERR(dfid)) { 697 err = PTR_ERR(dfid); 698 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 699 return err; 700 } 701 702 gid = v9fs_get_fsgid_for_create(dir); 703 704 /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */ 705 err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid); 706 707 if (err < 0) { 708 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err); 709 goto error; 710 } 711 712 v9fs_invalidate_inode_attr(dir); 713 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 714 /* Now walk from the parent so we can get an unopened fid. */ 715 fid = p9_client_walk(dfid, 1, &name, 1); 716 if (IS_ERR(fid)) { 717 err = PTR_ERR(fid); 718 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", 719 err); 720 fid = NULL; 721 goto error; 722 } 723 724 /* instantiate inode and assign the unopened fid to dentry */ 725 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 726 if (IS_ERR(inode)) { 727 err = PTR_ERR(inode); 728 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", 729 err); 730 goto error; 731 } 732 v9fs_fid_add(dentry, fid); 733 d_instantiate(dentry, inode); 734 fid = NULL; 735 err = 0; 736 } else { 737 /* Not in cached mode. No need to populate inode with stat */ 738 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0); 739 if (IS_ERR(inode)) { 740 err = PTR_ERR(inode); 741 goto error; 742 } 743 d_instantiate(dentry, inode); 744 } 745 746 error: 747 if (fid) 748 p9_client_clunk(fid); 749 750 return err; 751 } 752 753 /** 754 * v9fs_vfs_link_dotl - create a hardlink for dotl 755 * @old_dentry: dentry for file to link to 756 * @dir: inode destination for new link 757 * @dentry: dentry for link 758 * 759 */ 760 761 static int 762 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir, 763 struct dentry *dentry) 764 { 765 int err; 766 struct dentry *dir_dentry; 767 struct p9_fid *dfid, *oldfid; 768 struct v9fs_session_info *v9ses; 769 770 p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %pd, new_name: %pd\n", 771 dir->i_ino, old_dentry, dentry); 772 773 v9ses = v9fs_inode2v9ses(dir); 774 dir_dentry = dentry->d_parent; 775 dfid = v9fs_fid_lookup(dir_dentry); 776 if (IS_ERR(dfid)) 777 return PTR_ERR(dfid); 778 779 oldfid = v9fs_fid_lookup(old_dentry); 780 if (IS_ERR(oldfid)) 781 return PTR_ERR(oldfid); 782 783 err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name); 784 785 if (err < 0) { 786 p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err); 787 return err; 788 } 789 790 v9fs_invalidate_inode_attr(dir); 791 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 792 /* Get the latest stat info from server. */ 793 struct p9_fid *fid; 794 fid = v9fs_fid_lookup(old_dentry); 795 if (IS_ERR(fid)) 796 return PTR_ERR(fid); 797 798 v9fs_refresh_inode_dotl(fid, old_dentry->d_inode); 799 } 800 ihold(old_dentry->d_inode); 801 d_instantiate(dentry, old_dentry->d_inode); 802 803 return err; 804 } 805 806 /** 807 * v9fs_vfs_mknod_dotl - create a special file 808 * @dir: inode destination for new link 809 * @dentry: dentry for file 810 * @omode: mode for creation 811 * @rdev: device associated with special file 812 * 813 */ 814 static int 815 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode, 816 dev_t rdev) 817 { 818 int err; 819 kgid_t gid; 820 char *name; 821 umode_t mode; 822 struct v9fs_session_info *v9ses; 823 struct p9_fid *fid = NULL, *dfid = NULL; 824 struct inode *inode; 825 struct p9_qid qid; 826 struct dentry *dir_dentry; 827 struct posix_acl *dacl = NULL, *pacl = NULL; 828 829 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %hx MAJOR: %u MINOR: %u\n", 830 dir->i_ino, dentry, omode, 831 MAJOR(rdev), MINOR(rdev)); 832 833 if (!new_valid_dev(rdev)) 834 return -EINVAL; 835 836 v9ses = v9fs_inode2v9ses(dir); 837 dir_dentry = dentry->d_parent; 838 dfid = v9fs_fid_lookup(dir_dentry); 839 if (IS_ERR(dfid)) { 840 err = PTR_ERR(dfid); 841 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 842 dfid = NULL; 843 goto error; 844 } 845 846 gid = v9fs_get_fsgid_for_create(dir); 847 mode = omode; 848 /* Update mode based on ACL value */ 849 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); 850 if (err) { 851 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n", 852 err); 853 goto error; 854 } 855 name = (char *) dentry->d_name.name; 856 857 err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid); 858 if (err < 0) 859 goto error; 860 861 v9fs_invalidate_inode_attr(dir); 862 fid = p9_client_walk(dfid, 1, &name, 1); 863 if (IS_ERR(fid)) { 864 err = PTR_ERR(fid); 865 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", 866 err); 867 fid = NULL; 868 goto error; 869 } 870 871 /* instantiate inode and assign the unopened fid to the dentry */ 872 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 873 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 874 if (IS_ERR(inode)) { 875 err = PTR_ERR(inode); 876 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", 877 err); 878 goto error; 879 } 880 v9fs_set_create_acl(inode, fid, dacl, pacl); 881 v9fs_fid_add(dentry, fid); 882 d_instantiate(dentry, inode); 883 fid = NULL; 884 err = 0; 885 } else { 886 /* 887 * Not in cached mode. No need to populate inode with stat. 888 * socket syscall returns a fd, so we need instantiate 889 */ 890 inode = v9fs_get_inode(dir->i_sb, mode, rdev); 891 if (IS_ERR(inode)) { 892 err = PTR_ERR(inode); 893 goto error; 894 } 895 v9fs_set_create_acl(inode, fid, dacl, pacl); 896 d_instantiate(dentry, inode); 897 } 898 error: 899 if (fid) 900 p9_client_clunk(fid); 901 v9fs_put_acl(dacl, pacl); 902 return err; 903 } 904 905 /** 906 * v9fs_vfs_follow_link_dotl - follow a symlink path 907 * @dentry: dentry for symlink 908 * @nd: nameidata 909 * 910 */ 911 912 static void * 913 v9fs_vfs_follow_link_dotl(struct dentry *dentry, struct nameidata *nd) 914 { 915 int retval; 916 struct p9_fid *fid; 917 char *link = __getname(); 918 char *target; 919 920 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry); 921 922 if (!link) { 923 link = ERR_PTR(-ENOMEM); 924 goto ndset; 925 } 926 fid = v9fs_fid_lookup(dentry); 927 if (IS_ERR(fid)) { 928 __putname(link); 929 link = ERR_CAST(fid); 930 goto ndset; 931 } 932 retval = p9_client_readlink(fid, &target); 933 if (!retval) { 934 strcpy(link, target); 935 kfree(target); 936 goto ndset; 937 } 938 __putname(link); 939 link = ERR_PTR(retval); 940 ndset: 941 nd_set_link(nd, link); 942 return NULL; 943 } 944 945 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode) 946 { 947 loff_t i_size; 948 struct p9_stat_dotl *st; 949 struct v9fs_session_info *v9ses; 950 951 v9ses = v9fs_inode2v9ses(inode); 952 st = p9_client_getattr_dotl(fid, P9_STATS_ALL); 953 if (IS_ERR(st)) 954 return PTR_ERR(st); 955 /* 956 * Don't update inode if the file type is different 957 */ 958 if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT)) 959 goto out; 960 961 spin_lock(&inode->i_lock); 962 /* 963 * We don't want to refresh inode->i_size, 964 * because we may have cached data 965 */ 966 i_size = inode->i_size; 967 v9fs_stat2inode_dotl(st, inode); 968 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) 969 inode->i_size = i_size; 970 spin_unlock(&inode->i_lock); 971 out: 972 kfree(st); 973 return 0; 974 } 975 976 const struct inode_operations v9fs_dir_inode_operations_dotl = { 977 .create = v9fs_vfs_create_dotl, 978 .atomic_open = v9fs_vfs_atomic_open_dotl, 979 .lookup = v9fs_vfs_lookup, 980 .link = v9fs_vfs_link_dotl, 981 .symlink = v9fs_vfs_symlink_dotl, 982 .unlink = v9fs_vfs_unlink, 983 .mkdir = v9fs_vfs_mkdir_dotl, 984 .rmdir = v9fs_vfs_rmdir, 985 .mknod = v9fs_vfs_mknod_dotl, 986 .rename = v9fs_vfs_rename, 987 .getattr = v9fs_vfs_getattr_dotl, 988 .setattr = v9fs_vfs_setattr_dotl, 989 .setxattr = generic_setxattr, 990 .getxattr = generic_getxattr, 991 .removexattr = generic_removexattr, 992 .listxattr = v9fs_listxattr, 993 .get_acl = v9fs_iop_get_acl, 994 }; 995 996 const struct inode_operations v9fs_file_inode_operations_dotl = { 997 .getattr = v9fs_vfs_getattr_dotl, 998 .setattr = v9fs_vfs_setattr_dotl, 999 .setxattr = generic_setxattr, 1000 .getxattr = generic_getxattr, 1001 .removexattr = generic_removexattr, 1002 .listxattr = v9fs_listxattr, 1003 .get_acl = v9fs_iop_get_acl, 1004 }; 1005 1006 const struct inode_operations v9fs_symlink_inode_operations_dotl = { 1007 .readlink = generic_readlink, 1008 .follow_link = v9fs_vfs_follow_link_dotl, 1009 .put_link = v9fs_vfs_put_link, 1010 .getattr = v9fs_vfs_getattr_dotl, 1011 .setattr = v9fs_vfs_setattr_dotl, 1012 .setxattr = generic_setxattr, 1013 .getxattr = generic_getxattr, 1014 .removexattr = generic_removexattr, 1015 .listxattr = v9fs_listxattr, 1016 }; 1017