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 91 if (v9inode->qid.path != st->qid.path) 92 return 0; 93 return 1; 94 } 95 96 /* Always get a new inode */ 97 static int v9fs_test_new_inode_dotl(struct inode *inode, void *data) 98 { 99 return 0; 100 } 101 102 static int v9fs_set_inode_dotl(struct inode *inode, void *data) 103 { 104 struct v9fs_inode *v9inode = V9FS_I(inode); 105 struct p9_stat_dotl *st = (struct p9_stat_dotl *)data; 106 107 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid)); 108 inode->i_generation = st->st_gen; 109 return 0; 110 } 111 112 static struct inode *v9fs_qid_iget_dotl(struct super_block *sb, 113 struct p9_qid *qid, 114 struct p9_fid *fid, 115 struct p9_stat_dotl *st, 116 int new) 117 { 118 int retval; 119 unsigned long i_ino; 120 struct inode *inode; 121 struct v9fs_session_info *v9ses = sb->s_fs_info; 122 int (*test)(struct inode *, void *); 123 124 if (new) 125 test = v9fs_test_new_inode_dotl; 126 else 127 test = v9fs_test_inode_dotl; 128 129 i_ino = v9fs_qid2ino(qid); 130 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode_dotl, st); 131 if (!inode) 132 return ERR_PTR(-ENOMEM); 133 if (!(inode->i_state & I_NEW)) 134 return inode; 135 /* 136 * initialize the inode with the stat info 137 * FIXME!! we may need support for stale inodes 138 * later. 139 */ 140 inode->i_ino = i_ino; 141 retval = v9fs_init_inode(v9ses, inode, 142 st->st_mode, new_decode_dev(st->st_rdev)); 143 if (retval) 144 goto error; 145 146 v9fs_stat2inode_dotl(st, inode); 147 v9fs_cache_inode_get_cookie(inode); 148 retval = v9fs_get_acl(inode, fid); 149 if (retval) 150 goto error; 151 152 unlock_new_inode(inode); 153 return inode; 154 error: 155 iget_failed(inode); 156 return ERR_PTR(retval); 157 158 } 159 160 struct inode * 161 v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid, 162 struct super_block *sb, int new) 163 { 164 struct p9_stat_dotl *st; 165 struct inode *inode = NULL; 166 167 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN); 168 if (IS_ERR(st)) 169 return ERR_CAST(st); 170 171 inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st, new); 172 kfree(st); 173 return inode; 174 } 175 176 struct dotl_openflag_map { 177 int open_flag; 178 int dotl_flag; 179 }; 180 181 static int v9fs_mapped_dotl_flags(int flags) 182 { 183 int i; 184 int rflags = 0; 185 struct dotl_openflag_map dotl_oflag_map[] = { 186 { O_CREAT, P9_DOTL_CREATE }, 187 { O_EXCL, P9_DOTL_EXCL }, 188 { O_NOCTTY, P9_DOTL_NOCTTY }, 189 { O_APPEND, P9_DOTL_APPEND }, 190 { O_NONBLOCK, P9_DOTL_NONBLOCK }, 191 { O_DSYNC, P9_DOTL_DSYNC }, 192 { FASYNC, P9_DOTL_FASYNC }, 193 { O_DIRECT, P9_DOTL_DIRECT }, 194 { O_LARGEFILE, P9_DOTL_LARGEFILE }, 195 { O_DIRECTORY, P9_DOTL_DIRECTORY }, 196 { O_NOFOLLOW, P9_DOTL_NOFOLLOW }, 197 { O_NOATIME, P9_DOTL_NOATIME }, 198 { O_CLOEXEC, P9_DOTL_CLOEXEC }, 199 { O_SYNC, P9_DOTL_SYNC}, 200 }; 201 for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) { 202 if (flags & dotl_oflag_map[i].open_flag) 203 rflags |= dotl_oflag_map[i].dotl_flag; 204 } 205 return rflags; 206 } 207 208 /** 209 * v9fs_open_to_dotl_flags- convert Linux specific open flags to 210 * plan 9 open flag. 211 * @flags: flags to convert 212 */ 213 int v9fs_open_to_dotl_flags(int flags) 214 { 215 int rflags = 0; 216 217 /* 218 * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY 219 * and P9_DOTL_NOACCESS 220 */ 221 rflags |= flags & O_ACCMODE; 222 rflags |= v9fs_mapped_dotl_flags(flags); 223 224 return rflags; 225 } 226 227 /** 228 * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol. 229 * @dir: directory inode that is being created 230 * @dentry: dentry that is being deleted 231 * @omode: create permissions 232 * 233 */ 234 235 static int 236 v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, umode_t omode, 237 bool excl) 238 { 239 return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0); 240 } 241 242 static int 243 v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry, 244 struct file *file, unsigned flags, umode_t omode, 245 int *opened) 246 { 247 int err = 0; 248 kgid_t gid; 249 umode_t mode; 250 const unsigned char *name = NULL; 251 struct p9_qid qid; 252 struct inode *inode; 253 struct p9_fid *fid = NULL; 254 struct v9fs_inode *v9inode; 255 struct p9_fid *dfid, *ofid, *inode_fid; 256 struct v9fs_session_info *v9ses; 257 struct posix_acl *pacl = NULL, *dacl = NULL; 258 struct dentry *res = NULL; 259 260 if (d_in_lookup(dentry)) { 261 res = v9fs_vfs_lookup(dir, dentry, 0); 262 if (IS_ERR(res)) 263 return PTR_ERR(res); 264 265 if (res) 266 dentry = res; 267 } 268 269 /* Only creates */ 270 if (!(flags & O_CREAT) || d_really_is_positive(dentry)) 271 return finish_no_open(file, res); 272 273 v9ses = v9fs_inode2v9ses(dir); 274 275 name = dentry->d_name.name; 276 p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%hx\n", 277 name, flags, omode); 278 279 dfid = v9fs_parent_fid(dentry); 280 if (IS_ERR(dfid)) { 281 err = PTR_ERR(dfid); 282 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 283 goto out; 284 } 285 286 /* clone a fid to use for creation */ 287 ofid = clone_fid(dfid); 288 if (IS_ERR(ofid)) { 289 err = PTR_ERR(ofid); 290 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 291 goto out; 292 } 293 294 gid = v9fs_get_fsgid_for_create(dir); 295 296 mode = omode; 297 /* Update mode based on ACL value */ 298 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); 299 if (err) { 300 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in creat %d\n", 301 err); 302 goto error; 303 } 304 err = p9_client_create_dotl(ofid, name, v9fs_open_to_dotl_flags(flags), 305 mode, gid, &qid); 306 if (err < 0) { 307 p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in creat %d\n", 308 err); 309 goto error; 310 } 311 v9fs_invalidate_inode_attr(dir); 312 313 /* instantiate inode and assign the unopened fid to the dentry */ 314 fid = p9_client_walk(dfid, 1, &name, 1); 315 if (IS_ERR(fid)) { 316 err = PTR_ERR(fid); 317 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 318 fid = NULL; 319 goto error; 320 } 321 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 322 if (IS_ERR(inode)) { 323 err = PTR_ERR(inode); 324 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err); 325 goto error; 326 } 327 /* Now set the ACL based on the default value */ 328 v9fs_set_create_acl(inode, fid, dacl, pacl); 329 330 v9fs_fid_add(dentry, fid); 331 d_instantiate(dentry, inode); 332 333 v9inode = V9FS_I(inode); 334 mutex_lock(&v9inode->v_mutex); 335 if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) && 336 !v9inode->writeback_fid && 337 ((flags & O_ACCMODE) != O_RDONLY)) { 338 /* 339 * clone a fid and add it to writeback_fid 340 * we do it during open time instead of 341 * page dirty time via write_begin/page_mkwrite 342 * because we want write after unlink usecase 343 * to work. 344 */ 345 inode_fid = v9fs_writeback_fid(dentry); 346 if (IS_ERR(inode_fid)) { 347 err = PTR_ERR(inode_fid); 348 mutex_unlock(&v9inode->v_mutex); 349 goto err_clunk_old_fid; 350 } 351 v9inode->writeback_fid = (void *) inode_fid; 352 } 353 mutex_unlock(&v9inode->v_mutex); 354 /* Since we are opening a file, assign the open fid to the file */ 355 err = finish_open(file, dentry, generic_file_open, opened); 356 if (err) 357 goto err_clunk_old_fid; 358 file->private_data = ofid; 359 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) 360 v9fs_cache_inode_set_cookie(inode, file); 361 *opened |= FILE_CREATED; 362 out: 363 v9fs_put_acl(dacl, pacl); 364 dput(res); 365 return err; 366 367 error: 368 if (fid) 369 p9_client_clunk(fid); 370 err_clunk_old_fid: 371 if (ofid) 372 p9_client_clunk(ofid); 373 goto out; 374 } 375 376 /** 377 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory 378 * @dir: inode that is being unlinked 379 * @dentry: dentry that is being unlinked 380 * @omode: mode for new directory 381 * 382 */ 383 384 static int v9fs_vfs_mkdir_dotl(struct inode *dir, 385 struct dentry *dentry, umode_t omode) 386 { 387 int err; 388 struct v9fs_session_info *v9ses; 389 struct p9_fid *fid = NULL, *dfid = NULL; 390 kgid_t gid; 391 const unsigned char *name; 392 umode_t mode; 393 struct inode *inode; 394 struct p9_qid qid; 395 struct posix_acl *dacl = NULL, *pacl = NULL; 396 397 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry); 398 err = 0; 399 v9ses = v9fs_inode2v9ses(dir); 400 401 omode |= S_IFDIR; 402 if (dir->i_mode & S_ISGID) 403 omode |= S_ISGID; 404 405 dfid = v9fs_parent_fid(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 = 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(const struct path *path, struct kstat *stat, 475 u32 request_mask, unsigned int flags) 476 { 477 struct dentry *dentry = path->dentry; 478 struct v9fs_session_info *v9ses; 479 struct p9_fid *fid; 480 struct p9_stat_dotl *st; 481 482 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry); 483 v9ses = v9fs_dentry2v9ses(dentry); 484 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 485 generic_fillattr(d_inode(dentry), stat); 486 return 0; 487 } 488 fid = v9fs_fid_lookup(dentry); 489 if (IS_ERR(fid)) 490 return PTR_ERR(fid); 491 492 /* Ask for all the fields in stat structure. Server will return 493 * whatever it supports 494 */ 495 496 st = p9_client_getattr_dotl(fid, P9_STATS_ALL); 497 if (IS_ERR(st)) 498 return PTR_ERR(st); 499 500 v9fs_stat2inode_dotl(st, d_inode(dentry)); 501 generic_fillattr(d_inode(dentry), stat); 502 /* Change block size to what the server returned */ 503 stat->blksize = st->st_blksize; 504 505 kfree(st); 506 return 0; 507 } 508 509 /* 510 * Attribute flags. 511 */ 512 #define P9_ATTR_MODE (1 << 0) 513 #define P9_ATTR_UID (1 << 1) 514 #define P9_ATTR_GID (1 << 2) 515 #define P9_ATTR_SIZE (1 << 3) 516 #define P9_ATTR_ATIME (1 << 4) 517 #define P9_ATTR_MTIME (1 << 5) 518 #define P9_ATTR_CTIME (1 << 6) 519 #define P9_ATTR_ATIME_SET (1 << 7) 520 #define P9_ATTR_MTIME_SET (1 << 8) 521 522 struct dotl_iattr_map { 523 int iattr_valid; 524 int p9_iattr_valid; 525 }; 526 527 static int v9fs_mapped_iattr_valid(int iattr_valid) 528 { 529 int i; 530 int p9_iattr_valid = 0; 531 struct dotl_iattr_map dotl_iattr_map[] = { 532 { ATTR_MODE, P9_ATTR_MODE }, 533 { ATTR_UID, P9_ATTR_UID }, 534 { ATTR_GID, P9_ATTR_GID }, 535 { ATTR_SIZE, P9_ATTR_SIZE }, 536 { ATTR_ATIME, P9_ATTR_ATIME }, 537 { ATTR_MTIME, P9_ATTR_MTIME }, 538 { ATTR_CTIME, P9_ATTR_CTIME }, 539 { ATTR_ATIME_SET, P9_ATTR_ATIME_SET }, 540 { ATTR_MTIME_SET, P9_ATTR_MTIME_SET }, 541 }; 542 for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) { 543 if (iattr_valid & dotl_iattr_map[i].iattr_valid) 544 p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid; 545 } 546 return p9_iattr_valid; 547 } 548 549 /** 550 * v9fs_vfs_setattr_dotl - set file metadata 551 * @dentry: file whose metadata to set 552 * @iattr: metadata assignment structure 553 * 554 */ 555 556 int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr) 557 { 558 int retval; 559 struct p9_fid *fid; 560 struct p9_iattr_dotl p9attr; 561 struct inode *inode = d_inode(dentry); 562 563 p9_debug(P9_DEBUG_VFS, "\n"); 564 565 retval = setattr_prepare(dentry, iattr); 566 if (retval) 567 return retval; 568 569 p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid); 570 p9attr.mode = iattr->ia_mode; 571 p9attr.uid = iattr->ia_uid; 572 p9attr.gid = iattr->ia_gid; 573 p9attr.size = iattr->ia_size; 574 p9attr.atime_sec = iattr->ia_atime.tv_sec; 575 p9attr.atime_nsec = iattr->ia_atime.tv_nsec; 576 p9attr.mtime_sec = iattr->ia_mtime.tv_sec; 577 p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec; 578 579 fid = v9fs_fid_lookup(dentry); 580 if (IS_ERR(fid)) 581 return PTR_ERR(fid); 582 583 /* Write all dirty data */ 584 if (S_ISREG(inode->i_mode)) 585 filemap_write_and_wait(inode->i_mapping); 586 587 retval = p9_client_setattr(fid, &p9attr); 588 if (retval < 0) 589 return retval; 590 591 if ((iattr->ia_valid & ATTR_SIZE) && 592 iattr->ia_size != i_size_read(inode)) 593 truncate_setsize(inode, iattr->ia_size); 594 595 v9fs_invalidate_inode_attr(inode); 596 setattr_copy(inode, iattr); 597 mark_inode_dirty(inode); 598 if (iattr->ia_valid & ATTR_MODE) { 599 /* We also want to update ACL when we update mode bits */ 600 retval = v9fs_acl_chmod(inode, fid); 601 if (retval < 0) 602 return retval; 603 } 604 return 0; 605 } 606 607 /** 608 * v9fs_stat2inode_dotl - populate an inode structure with stat info 609 * @stat: stat structure 610 * @inode: inode to populate 611 * 612 */ 613 614 void 615 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode) 616 { 617 umode_t mode; 618 struct v9fs_inode *v9inode = V9FS_I(inode); 619 620 if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) { 621 inode->i_atime.tv_sec = stat->st_atime_sec; 622 inode->i_atime.tv_nsec = stat->st_atime_nsec; 623 inode->i_mtime.tv_sec = stat->st_mtime_sec; 624 inode->i_mtime.tv_nsec = stat->st_mtime_nsec; 625 inode->i_ctime.tv_sec = stat->st_ctime_sec; 626 inode->i_ctime.tv_nsec = stat->st_ctime_nsec; 627 inode->i_uid = stat->st_uid; 628 inode->i_gid = stat->st_gid; 629 set_nlink(inode, stat->st_nlink); 630 631 mode = stat->st_mode & S_IALLUGO; 632 mode |= inode->i_mode & ~S_IALLUGO; 633 inode->i_mode = mode; 634 635 i_size_write(inode, stat->st_size); 636 inode->i_blocks = stat->st_blocks; 637 } else { 638 if (stat->st_result_mask & P9_STATS_ATIME) { 639 inode->i_atime.tv_sec = stat->st_atime_sec; 640 inode->i_atime.tv_nsec = stat->st_atime_nsec; 641 } 642 if (stat->st_result_mask & P9_STATS_MTIME) { 643 inode->i_mtime.tv_sec = stat->st_mtime_sec; 644 inode->i_mtime.tv_nsec = stat->st_mtime_nsec; 645 } 646 if (stat->st_result_mask & P9_STATS_CTIME) { 647 inode->i_ctime.tv_sec = stat->st_ctime_sec; 648 inode->i_ctime.tv_nsec = stat->st_ctime_nsec; 649 } 650 if (stat->st_result_mask & P9_STATS_UID) 651 inode->i_uid = stat->st_uid; 652 if (stat->st_result_mask & P9_STATS_GID) 653 inode->i_gid = stat->st_gid; 654 if (stat->st_result_mask & P9_STATS_NLINK) 655 set_nlink(inode, stat->st_nlink); 656 if (stat->st_result_mask & P9_STATS_MODE) { 657 inode->i_mode = stat->st_mode; 658 if ((S_ISBLK(inode->i_mode)) || 659 (S_ISCHR(inode->i_mode))) 660 init_special_inode(inode, inode->i_mode, 661 inode->i_rdev); 662 } 663 if (stat->st_result_mask & P9_STATS_RDEV) 664 inode->i_rdev = new_decode_dev(stat->st_rdev); 665 if (stat->st_result_mask & P9_STATS_SIZE) 666 i_size_write(inode, stat->st_size); 667 if (stat->st_result_mask & P9_STATS_BLOCKS) 668 inode->i_blocks = stat->st_blocks; 669 } 670 if (stat->st_result_mask & P9_STATS_GEN) 671 inode->i_generation = stat->st_gen; 672 673 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION 674 * because the inode structure does not have fields for them. 675 */ 676 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR; 677 } 678 679 static int 680 v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry, 681 const char *symname) 682 { 683 int err; 684 kgid_t gid; 685 const unsigned char *name; 686 struct p9_qid qid; 687 struct inode *inode; 688 struct p9_fid *dfid; 689 struct p9_fid *fid = NULL; 690 struct v9fs_session_info *v9ses; 691 692 name = dentry->d_name.name; 693 p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname); 694 v9ses = v9fs_inode2v9ses(dir); 695 696 dfid = v9fs_parent_fid(dentry); 697 if (IS_ERR(dfid)) { 698 err = PTR_ERR(dfid); 699 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 700 return err; 701 } 702 703 gid = v9fs_get_fsgid_for_create(dir); 704 705 /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */ 706 err = p9_client_symlink(dfid, name, symname, gid, &qid); 707 708 if (err < 0) { 709 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err); 710 goto error; 711 } 712 713 v9fs_invalidate_inode_attr(dir); 714 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 715 /* Now walk from the parent so we can get an unopened fid. */ 716 fid = p9_client_walk(dfid, 1, &name, 1); 717 if (IS_ERR(fid)) { 718 err = PTR_ERR(fid); 719 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", 720 err); 721 fid = NULL; 722 goto error; 723 } 724 725 /* instantiate inode and assign the unopened fid to dentry */ 726 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 727 if (IS_ERR(inode)) { 728 err = PTR_ERR(inode); 729 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", 730 err); 731 goto error; 732 } 733 v9fs_fid_add(dentry, fid); 734 d_instantiate(dentry, inode); 735 fid = NULL; 736 err = 0; 737 } else { 738 /* Not in cached mode. No need to populate inode with stat */ 739 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0); 740 if (IS_ERR(inode)) { 741 err = PTR_ERR(inode); 742 goto error; 743 } 744 d_instantiate(dentry, inode); 745 } 746 747 error: 748 if (fid) 749 p9_client_clunk(fid); 750 751 return err; 752 } 753 754 /** 755 * v9fs_vfs_link_dotl - create a hardlink for dotl 756 * @old_dentry: dentry for file to link to 757 * @dir: inode destination for new link 758 * @dentry: dentry for link 759 * 760 */ 761 762 static int 763 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir, 764 struct dentry *dentry) 765 { 766 int err; 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 dfid = v9fs_parent_fid(dentry); 775 if (IS_ERR(dfid)) 776 return PTR_ERR(dfid); 777 778 oldfid = v9fs_fid_lookup(old_dentry); 779 if (IS_ERR(oldfid)) 780 return PTR_ERR(oldfid); 781 782 err = p9_client_link(dfid, oldfid, dentry->d_name.name); 783 784 if (err < 0) { 785 p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err); 786 return err; 787 } 788 789 v9fs_invalidate_inode_attr(dir); 790 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 791 /* Get the latest stat info from server. */ 792 struct p9_fid *fid; 793 fid = v9fs_fid_lookup(old_dentry); 794 if (IS_ERR(fid)) 795 return PTR_ERR(fid); 796 797 v9fs_refresh_inode_dotl(fid, d_inode(old_dentry)); 798 } 799 ihold(d_inode(old_dentry)); 800 d_instantiate(dentry, d_inode(old_dentry)); 801 802 return err; 803 } 804 805 /** 806 * v9fs_vfs_mknod_dotl - create a special file 807 * @dir: inode destination for new link 808 * @dentry: dentry for file 809 * @omode: mode for creation 810 * @rdev: device associated with special file 811 * 812 */ 813 static int 814 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode, 815 dev_t rdev) 816 { 817 int err; 818 kgid_t gid; 819 const unsigned char *name; 820 umode_t mode; 821 struct v9fs_session_info *v9ses; 822 struct p9_fid *fid = NULL, *dfid = NULL; 823 struct inode *inode; 824 struct p9_qid qid; 825 struct posix_acl *dacl = NULL, *pacl = NULL; 826 827 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %hx MAJOR: %u MINOR: %u\n", 828 dir->i_ino, dentry, omode, 829 MAJOR(rdev), MINOR(rdev)); 830 831 v9ses = v9fs_inode2v9ses(dir); 832 dfid = v9fs_parent_fid(dentry); 833 if (IS_ERR(dfid)) { 834 err = PTR_ERR(dfid); 835 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 836 dfid = NULL; 837 goto error; 838 } 839 840 gid = v9fs_get_fsgid_for_create(dir); 841 mode = omode; 842 /* Update mode based on ACL value */ 843 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); 844 if (err) { 845 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n", 846 err); 847 goto error; 848 } 849 name = dentry->d_name.name; 850 851 err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid); 852 if (err < 0) 853 goto error; 854 855 v9fs_invalidate_inode_attr(dir); 856 fid = p9_client_walk(dfid, 1, &name, 1); 857 if (IS_ERR(fid)) { 858 err = PTR_ERR(fid); 859 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", 860 err); 861 fid = NULL; 862 goto error; 863 } 864 865 /* instantiate inode and assign the unopened fid to the dentry */ 866 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 867 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 868 if (IS_ERR(inode)) { 869 err = PTR_ERR(inode); 870 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", 871 err); 872 goto error; 873 } 874 v9fs_set_create_acl(inode, fid, dacl, pacl); 875 v9fs_fid_add(dentry, fid); 876 d_instantiate(dentry, inode); 877 fid = NULL; 878 err = 0; 879 } else { 880 /* 881 * Not in cached mode. No need to populate inode with stat. 882 * socket syscall returns a fd, so we need instantiate 883 */ 884 inode = v9fs_get_inode(dir->i_sb, mode, rdev); 885 if (IS_ERR(inode)) { 886 err = PTR_ERR(inode); 887 goto error; 888 } 889 v9fs_set_create_acl(inode, fid, dacl, pacl); 890 d_instantiate(dentry, inode); 891 } 892 error: 893 if (fid) 894 p9_client_clunk(fid); 895 v9fs_put_acl(dacl, pacl); 896 return err; 897 } 898 899 /** 900 * v9fs_vfs_get_link_dotl - follow a symlink path 901 * @dentry: dentry for symlink 902 * @inode: inode for symlink 903 * @done: destructor for return value 904 */ 905 906 static const char * 907 v9fs_vfs_get_link_dotl(struct dentry *dentry, 908 struct inode *inode, 909 struct delayed_call *done) 910 { 911 struct p9_fid *fid; 912 char *target; 913 int retval; 914 915 if (!dentry) 916 return ERR_PTR(-ECHILD); 917 918 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry); 919 920 fid = v9fs_fid_lookup(dentry); 921 if (IS_ERR(fid)) 922 return ERR_CAST(fid); 923 retval = p9_client_readlink(fid, &target); 924 if (retval) 925 return ERR_PTR(retval); 926 set_delayed_call(done, kfree_link, target); 927 return target; 928 } 929 930 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode) 931 { 932 loff_t i_size; 933 struct p9_stat_dotl *st; 934 struct v9fs_session_info *v9ses; 935 936 v9ses = v9fs_inode2v9ses(inode); 937 st = p9_client_getattr_dotl(fid, P9_STATS_ALL); 938 if (IS_ERR(st)) 939 return PTR_ERR(st); 940 /* 941 * Don't update inode if the file type is different 942 */ 943 if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT)) 944 goto out; 945 946 spin_lock(&inode->i_lock); 947 /* 948 * We don't want to refresh inode->i_size, 949 * because we may have cached data 950 */ 951 i_size = inode->i_size; 952 v9fs_stat2inode_dotl(st, inode); 953 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) 954 inode->i_size = i_size; 955 spin_unlock(&inode->i_lock); 956 out: 957 kfree(st); 958 return 0; 959 } 960 961 const struct inode_operations v9fs_dir_inode_operations_dotl = { 962 .create = v9fs_vfs_create_dotl, 963 .atomic_open = v9fs_vfs_atomic_open_dotl, 964 .lookup = v9fs_vfs_lookup, 965 .link = v9fs_vfs_link_dotl, 966 .symlink = v9fs_vfs_symlink_dotl, 967 .unlink = v9fs_vfs_unlink, 968 .mkdir = v9fs_vfs_mkdir_dotl, 969 .rmdir = v9fs_vfs_rmdir, 970 .mknod = v9fs_vfs_mknod_dotl, 971 .rename = v9fs_vfs_rename, 972 .getattr = v9fs_vfs_getattr_dotl, 973 .setattr = v9fs_vfs_setattr_dotl, 974 .listxattr = v9fs_listxattr, 975 .get_acl = v9fs_iop_get_acl, 976 }; 977 978 const struct inode_operations v9fs_file_inode_operations_dotl = { 979 .getattr = v9fs_vfs_getattr_dotl, 980 .setattr = v9fs_vfs_setattr_dotl, 981 .listxattr = v9fs_listxattr, 982 .get_acl = v9fs_iop_get_acl, 983 }; 984 985 const struct inode_operations v9fs_symlink_inode_operations_dotl = { 986 .get_link = v9fs_vfs_get_link_dotl, 987 .getattr = v9fs_vfs_getattr_dotl, 988 .setattr = v9fs_vfs_setattr_dotl, 989 .listxattr = v9fs_listxattr, 990 }; 991