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, 0); 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 { 246 int err = 0; 247 kgid_t gid; 248 umode_t mode; 249 const unsigned char *name = NULL; 250 struct p9_qid qid; 251 struct inode *inode; 252 struct p9_fid *fid = NULL; 253 struct v9fs_inode *v9inode; 254 struct p9_fid *dfid, *ofid, *inode_fid; 255 struct v9fs_session_info *v9ses; 256 struct posix_acl *pacl = NULL, *dacl = NULL; 257 struct dentry *res = NULL; 258 259 if (d_in_lookup(dentry)) { 260 res = v9fs_vfs_lookup(dir, dentry, 0); 261 if (IS_ERR(res)) 262 return PTR_ERR(res); 263 264 if (res) 265 dentry = res; 266 } 267 268 /* Only creates */ 269 if (!(flags & O_CREAT) || d_really_is_positive(dentry)) 270 return finish_no_open(file, res); 271 272 v9ses = v9fs_inode2v9ses(dir); 273 274 name = dentry->d_name.name; 275 p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%hx\n", 276 name, flags, omode); 277 278 dfid = v9fs_parent_fid(dentry); 279 if (IS_ERR(dfid)) { 280 err = PTR_ERR(dfid); 281 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 282 goto out; 283 } 284 285 /* clone a fid to use for creation */ 286 ofid = clone_fid(dfid); 287 if (IS_ERR(ofid)) { 288 err = PTR_ERR(ofid); 289 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 290 goto out; 291 } 292 293 gid = v9fs_get_fsgid_for_create(dir); 294 295 mode = omode; 296 /* Update mode based on ACL value */ 297 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); 298 if (err) { 299 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in creat %d\n", 300 err); 301 goto error; 302 } 303 err = p9_client_create_dotl(ofid, name, v9fs_open_to_dotl_flags(flags), 304 mode, gid, &qid); 305 if (err < 0) { 306 p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in creat %d\n", 307 err); 308 goto error; 309 } 310 v9fs_invalidate_inode_attr(dir); 311 312 /* instantiate inode and assign the unopened fid to the dentry */ 313 fid = p9_client_walk(dfid, 1, &name, 1); 314 if (IS_ERR(fid)) { 315 err = PTR_ERR(fid); 316 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 317 fid = NULL; 318 goto error; 319 } 320 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 321 if (IS_ERR(inode)) { 322 err = PTR_ERR(inode); 323 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err); 324 goto error; 325 } 326 /* Now set the ACL based on the default value */ 327 v9fs_set_create_acl(inode, fid, dacl, pacl); 328 329 v9fs_fid_add(dentry, fid); 330 d_instantiate(dentry, inode); 331 332 v9inode = V9FS_I(inode); 333 mutex_lock(&v9inode->v_mutex); 334 if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) && 335 !v9inode->writeback_fid && 336 ((flags & O_ACCMODE) != O_RDONLY)) { 337 /* 338 * clone a fid and add it to writeback_fid 339 * we do it during open time instead of 340 * page dirty time via write_begin/page_mkwrite 341 * because we want write after unlink usecase 342 * to work. 343 */ 344 inode_fid = v9fs_writeback_fid(dentry); 345 if (IS_ERR(inode_fid)) { 346 err = PTR_ERR(inode_fid); 347 mutex_unlock(&v9inode->v_mutex); 348 goto err_clunk_old_fid; 349 } 350 v9inode->writeback_fid = (void *) inode_fid; 351 } 352 mutex_unlock(&v9inode->v_mutex); 353 /* Since we are opening a file, assign the open fid to the file */ 354 err = finish_open(file, dentry, generic_file_open); 355 if (err) 356 goto err_clunk_old_fid; 357 file->private_data = ofid; 358 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) 359 v9fs_cache_inode_set_cookie(inode, file); 360 file->f_mode |= FMODE_CREATED; 361 out: 362 v9fs_put_acl(dacl, pacl); 363 dput(res); 364 return err; 365 366 error: 367 if (fid) 368 p9_client_clunk(fid); 369 err_clunk_old_fid: 370 if (ofid) 371 p9_client_clunk(ofid); 372 goto out; 373 } 374 375 /** 376 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory 377 * @dir: inode that is being unlinked 378 * @dentry: dentry that is being unlinked 379 * @omode: mode for new directory 380 * 381 */ 382 383 static int v9fs_vfs_mkdir_dotl(struct inode *dir, 384 struct dentry *dentry, umode_t omode) 385 { 386 int err; 387 struct v9fs_session_info *v9ses; 388 struct p9_fid *fid = NULL, *dfid = NULL; 389 kgid_t gid; 390 const unsigned char *name; 391 umode_t mode; 392 struct inode *inode; 393 struct p9_qid qid; 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 dfid = v9fs_parent_fid(dentry); 405 if (IS_ERR(dfid)) { 406 err = PTR_ERR(dfid); 407 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 408 dfid = NULL; 409 goto error; 410 } 411 412 gid = v9fs_get_fsgid_for_create(dir); 413 mode = omode; 414 /* Update mode based on ACL value */ 415 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); 416 if (err) { 417 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n", 418 err); 419 goto error; 420 } 421 name = dentry->d_name.name; 422 err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid); 423 if (err < 0) 424 goto error; 425 426 fid = p9_client_walk(dfid, 1, &name, 1); 427 if (IS_ERR(fid)) { 428 err = PTR_ERR(fid); 429 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", 430 err); 431 fid = NULL; 432 goto error; 433 } 434 435 /* instantiate inode and assign the unopened fid to the dentry */ 436 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 437 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 438 if (IS_ERR(inode)) { 439 err = PTR_ERR(inode); 440 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", 441 err); 442 goto error; 443 } 444 v9fs_fid_add(dentry, fid); 445 v9fs_set_create_acl(inode, fid, dacl, pacl); 446 d_instantiate(dentry, inode); 447 fid = NULL; 448 err = 0; 449 } else { 450 /* 451 * Not in cached mode. No need to populate 452 * inode with stat. We need to get an inode 453 * so that we can set the acl with dentry 454 */ 455 inode = v9fs_get_inode(dir->i_sb, mode, 0); 456 if (IS_ERR(inode)) { 457 err = PTR_ERR(inode); 458 goto error; 459 } 460 v9fs_set_create_acl(inode, fid, dacl, pacl); 461 d_instantiate(dentry, inode); 462 } 463 inc_nlink(dir); 464 v9fs_invalidate_inode_attr(dir); 465 error: 466 if (fid) 467 p9_client_clunk(fid); 468 v9fs_put_acl(dacl, pacl); 469 return err; 470 } 471 472 static int 473 v9fs_vfs_getattr_dotl(const struct path *path, struct kstat *stat, 474 u32 request_mask, unsigned int flags) 475 { 476 struct dentry *dentry = path->dentry; 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(d_inode(dentry), 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, d_inode(dentry), 0); 500 generic_fillattr(d_inode(dentry), 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 = d_inode(dentry); 561 562 p9_debug(P9_DEBUG_VFS, "\n"); 563 564 retval = setattr_prepare(dentry, 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 * @flags: ctrl flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE) 611 * 612 */ 613 614 void 615 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode, 616 unsigned int flags) 617 { 618 umode_t mode; 619 struct v9fs_inode *v9inode = V9FS_I(inode); 620 621 if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) { 622 inode->i_atime.tv_sec = stat->st_atime_sec; 623 inode->i_atime.tv_nsec = stat->st_atime_nsec; 624 inode->i_mtime.tv_sec = stat->st_mtime_sec; 625 inode->i_mtime.tv_nsec = stat->st_mtime_nsec; 626 inode->i_ctime.tv_sec = stat->st_ctime_sec; 627 inode->i_ctime.tv_nsec = stat->st_ctime_nsec; 628 inode->i_uid = stat->st_uid; 629 inode->i_gid = stat->st_gid; 630 set_nlink(inode, stat->st_nlink); 631 632 mode = stat->st_mode & S_IALLUGO; 633 mode |= inode->i_mode & ~S_IALLUGO; 634 inode->i_mode = mode; 635 636 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE)) 637 v9fs_i_size_write(inode, stat->st_size); 638 inode->i_blocks = stat->st_blocks; 639 } else { 640 if (stat->st_result_mask & P9_STATS_ATIME) { 641 inode->i_atime.tv_sec = stat->st_atime_sec; 642 inode->i_atime.tv_nsec = stat->st_atime_nsec; 643 } 644 if (stat->st_result_mask & P9_STATS_MTIME) { 645 inode->i_mtime.tv_sec = stat->st_mtime_sec; 646 inode->i_mtime.tv_nsec = stat->st_mtime_nsec; 647 } 648 if (stat->st_result_mask & P9_STATS_CTIME) { 649 inode->i_ctime.tv_sec = stat->st_ctime_sec; 650 inode->i_ctime.tv_nsec = stat->st_ctime_nsec; 651 } 652 if (stat->st_result_mask & P9_STATS_UID) 653 inode->i_uid = stat->st_uid; 654 if (stat->st_result_mask & P9_STATS_GID) 655 inode->i_gid = stat->st_gid; 656 if (stat->st_result_mask & P9_STATS_NLINK) 657 set_nlink(inode, stat->st_nlink); 658 if (stat->st_result_mask & P9_STATS_MODE) { 659 inode->i_mode = stat->st_mode; 660 if ((S_ISBLK(inode->i_mode)) || 661 (S_ISCHR(inode->i_mode))) 662 init_special_inode(inode, inode->i_mode, 663 inode->i_rdev); 664 } 665 if (stat->st_result_mask & P9_STATS_RDEV) 666 inode->i_rdev = new_decode_dev(stat->st_rdev); 667 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE) && 668 stat->st_result_mask & P9_STATS_SIZE) 669 v9fs_i_size_write(inode, stat->st_size); 670 if (stat->st_result_mask & P9_STATS_BLOCKS) 671 inode->i_blocks = stat->st_blocks; 672 } 673 if (stat->st_result_mask & P9_STATS_GEN) 674 inode->i_generation = stat->st_gen; 675 676 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION 677 * because the inode structure does not have fields for them. 678 */ 679 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR; 680 } 681 682 static int 683 v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry, 684 const char *symname) 685 { 686 int err; 687 kgid_t gid; 688 const unsigned char *name; 689 struct p9_qid qid; 690 struct inode *inode; 691 struct p9_fid *dfid; 692 struct p9_fid *fid = NULL; 693 struct v9fs_session_info *v9ses; 694 695 name = dentry->d_name.name; 696 p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname); 697 v9ses = v9fs_inode2v9ses(dir); 698 699 dfid = v9fs_parent_fid(dentry); 700 if (IS_ERR(dfid)) { 701 err = PTR_ERR(dfid); 702 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 703 return err; 704 } 705 706 gid = v9fs_get_fsgid_for_create(dir); 707 708 /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */ 709 err = p9_client_symlink(dfid, name, symname, gid, &qid); 710 711 if (err < 0) { 712 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err); 713 goto error; 714 } 715 716 v9fs_invalidate_inode_attr(dir); 717 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 718 /* Now walk from the parent so we can get an unopened fid. */ 719 fid = p9_client_walk(dfid, 1, &name, 1); 720 if (IS_ERR(fid)) { 721 err = PTR_ERR(fid); 722 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", 723 err); 724 fid = NULL; 725 goto error; 726 } 727 728 /* instantiate inode and assign the unopened fid to dentry */ 729 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 730 if (IS_ERR(inode)) { 731 err = PTR_ERR(inode); 732 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", 733 err); 734 goto error; 735 } 736 v9fs_fid_add(dentry, fid); 737 d_instantiate(dentry, inode); 738 fid = NULL; 739 err = 0; 740 } else { 741 /* Not in cached mode. No need to populate inode with stat */ 742 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0); 743 if (IS_ERR(inode)) { 744 err = PTR_ERR(inode); 745 goto error; 746 } 747 d_instantiate(dentry, inode); 748 } 749 750 error: 751 if (fid) 752 p9_client_clunk(fid); 753 754 return err; 755 } 756 757 /** 758 * v9fs_vfs_link_dotl - create a hardlink for dotl 759 * @old_dentry: dentry for file to link to 760 * @dir: inode destination for new link 761 * @dentry: dentry for link 762 * 763 */ 764 765 static int 766 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir, 767 struct dentry *dentry) 768 { 769 int err; 770 struct p9_fid *dfid, *oldfid; 771 struct v9fs_session_info *v9ses; 772 773 p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %pd, new_name: %pd\n", 774 dir->i_ino, old_dentry, dentry); 775 776 v9ses = v9fs_inode2v9ses(dir); 777 dfid = v9fs_parent_fid(dentry); 778 if (IS_ERR(dfid)) 779 return PTR_ERR(dfid); 780 781 oldfid = v9fs_fid_lookup(old_dentry); 782 if (IS_ERR(oldfid)) 783 return PTR_ERR(oldfid); 784 785 err = p9_client_link(dfid, oldfid, dentry->d_name.name); 786 787 if (err < 0) { 788 p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err); 789 return err; 790 } 791 792 v9fs_invalidate_inode_attr(dir); 793 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 794 /* Get the latest stat info from server. */ 795 struct p9_fid *fid; 796 fid = v9fs_fid_lookup(old_dentry); 797 if (IS_ERR(fid)) 798 return PTR_ERR(fid); 799 800 v9fs_refresh_inode_dotl(fid, d_inode(old_dentry)); 801 } 802 ihold(d_inode(old_dentry)); 803 d_instantiate(dentry, d_inode(old_dentry)); 804 805 return err; 806 } 807 808 /** 809 * v9fs_vfs_mknod_dotl - create a special file 810 * @dir: inode destination for new link 811 * @dentry: dentry for file 812 * @omode: mode for creation 813 * @rdev: device associated with special file 814 * 815 */ 816 static int 817 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode, 818 dev_t rdev) 819 { 820 int err; 821 kgid_t gid; 822 const unsigned char *name; 823 umode_t mode; 824 struct v9fs_session_info *v9ses; 825 struct p9_fid *fid = NULL, *dfid = NULL; 826 struct inode *inode; 827 struct p9_qid qid; 828 struct posix_acl *dacl = NULL, *pacl = NULL; 829 830 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %hx MAJOR: %u MINOR: %u\n", 831 dir->i_ino, dentry, omode, 832 MAJOR(rdev), MINOR(rdev)); 833 834 v9ses = v9fs_inode2v9ses(dir); 835 dfid = v9fs_parent_fid(dentry); 836 if (IS_ERR(dfid)) { 837 err = PTR_ERR(dfid); 838 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 839 dfid = NULL; 840 goto error; 841 } 842 843 gid = v9fs_get_fsgid_for_create(dir); 844 mode = omode; 845 /* Update mode based on ACL value */ 846 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); 847 if (err) { 848 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n", 849 err); 850 goto error; 851 } 852 name = dentry->d_name.name; 853 854 err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid); 855 if (err < 0) 856 goto error; 857 858 v9fs_invalidate_inode_attr(dir); 859 fid = p9_client_walk(dfid, 1, &name, 1); 860 if (IS_ERR(fid)) { 861 err = PTR_ERR(fid); 862 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", 863 err); 864 fid = NULL; 865 goto error; 866 } 867 868 /* instantiate inode and assign the unopened fid to the dentry */ 869 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 870 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 871 if (IS_ERR(inode)) { 872 err = PTR_ERR(inode); 873 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", 874 err); 875 goto error; 876 } 877 v9fs_set_create_acl(inode, fid, dacl, pacl); 878 v9fs_fid_add(dentry, fid); 879 d_instantiate(dentry, inode); 880 fid = NULL; 881 err = 0; 882 } else { 883 /* 884 * Not in cached mode. No need to populate inode with stat. 885 * socket syscall returns a fd, so we need instantiate 886 */ 887 inode = v9fs_get_inode(dir->i_sb, mode, rdev); 888 if (IS_ERR(inode)) { 889 err = PTR_ERR(inode); 890 goto error; 891 } 892 v9fs_set_create_acl(inode, fid, dacl, pacl); 893 d_instantiate(dentry, inode); 894 } 895 error: 896 if (fid) 897 p9_client_clunk(fid); 898 v9fs_put_acl(dacl, pacl); 899 return err; 900 } 901 902 /** 903 * v9fs_vfs_get_link_dotl - follow a symlink path 904 * @dentry: dentry for symlink 905 * @inode: inode for symlink 906 * @done: destructor for return value 907 */ 908 909 static const char * 910 v9fs_vfs_get_link_dotl(struct dentry *dentry, 911 struct inode *inode, 912 struct delayed_call *done) 913 { 914 struct p9_fid *fid; 915 char *target; 916 int retval; 917 918 if (!dentry) 919 return ERR_PTR(-ECHILD); 920 921 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry); 922 923 fid = v9fs_fid_lookup(dentry); 924 if (IS_ERR(fid)) 925 return ERR_CAST(fid); 926 retval = p9_client_readlink(fid, &target); 927 if (retval) 928 return ERR_PTR(retval); 929 set_delayed_call(done, kfree_link, target); 930 return target; 931 } 932 933 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode) 934 { 935 struct p9_stat_dotl *st; 936 struct v9fs_session_info *v9ses; 937 unsigned int flags; 938 939 v9ses = v9fs_inode2v9ses(inode); 940 st = p9_client_getattr_dotl(fid, P9_STATS_ALL); 941 if (IS_ERR(st)) 942 return PTR_ERR(st); 943 /* 944 * Don't update inode if the file type is different 945 */ 946 if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT)) 947 goto out; 948 949 /* 950 * We don't want to refresh inode->i_size, 951 * because we may have cached data 952 */ 953 flags = (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) ? 954 V9FS_STAT2INODE_KEEP_ISIZE : 0; 955 v9fs_stat2inode_dotl(st, inode, flags); 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