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 * @mode: 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 && !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) 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 * @mode: 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 char *name; 389 umode_t mode; 390 struct inode *inode; 391 struct p9_qid qid; 392 struct dentry *dir_dentry; 393 struct posix_acl *dacl = NULL, *pacl = NULL; 394 395 p9_debug(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); 396 err = 0; 397 v9ses = v9fs_inode2v9ses(dir); 398 399 omode |= S_IFDIR; 400 if (dir->i_mode & S_ISGID) 401 omode |= S_ISGID; 402 403 dir_dentry = dentry->d_parent; 404 dfid = v9fs_fid_lookup(dir_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 = (char *) 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(struct vfsmount *mnt, struct dentry *dentry, 474 struct kstat *stat) 475 { 476 int err; 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 err = -EPERM; 483 v9ses = v9fs_dentry2v9ses(dentry); 484 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 485 generic_fillattr(dentry->d_inode, 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, dentry->d_inode); 501 generic_fillattr(dentry->d_inode, 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 v9fs_session_info *v9ses; 560 struct p9_fid *fid; 561 struct p9_iattr_dotl p9attr; 562 struct inode *inode = dentry->d_inode; 563 564 p9_debug(P9_DEBUG_VFS, "\n"); 565 566 retval = inode_change_ok(inode, iattr); 567 if (retval) 568 return retval; 569 570 p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid); 571 p9attr.mode = iattr->ia_mode; 572 p9attr.uid = iattr->ia_uid; 573 p9attr.gid = iattr->ia_gid; 574 p9attr.size = iattr->ia_size; 575 p9attr.atime_sec = iattr->ia_atime.tv_sec; 576 p9attr.atime_nsec = iattr->ia_atime.tv_nsec; 577 p9attr.mtime_sec = iattr->ia_mtime.tv_sec; 578 p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec; 579 580 retval = -EPERM; 581 v9ses = v9fs_dentry2v9ses(dentry); 582 fid = v9fs_fid_lookup(dentry); 583 if (IS_ERR(fid)) 584 return PTR_ERR(fid); 585 586 /* Write all dirty data */ 587 if (S_ISREG(inode->i_mode)) 588 filemap_write_and_wait(inode->i_mapping); 589 590 retval = p9_client_setattr(fid, &p9attr); 591 if (retval < 0) 592 return retval; 593 594 if ((iattr->ia_valid & ATTR_SIZE) && 595 iattr->ia_size != i_size_read(inode)) 596 truncate_setsize(inode, iattr->ia_size); 597 598 v9fs_invalidate_inode_attr(inode); 599 setattr_copy(inode, iattr); 600 mark_inode_dirty(inode); 601 if (iattr->ia_valid & ATTR_MODE) { 602 /* We also want to update ACL when we update mode bits */ 603 retval = v9fs_acl_chmod(inode, fid); 604 if (retval < 0) 605 return retval; 606 } 607 return 0; 608 } 609 610 /** 611 * v9fs_stat2inode_dotl - populate an inode structure with stat info 612 * @stat: stat structure 613 * @inode: inode to populate 614 * @sb: superblock of filesystem 615 * 616 */ 617 618 void 619 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode) 620 { 621 umode_t mode; 622 struct v9fs_inode *v9inode = V9FS_I(inode); 623 624 if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) { 625 inode->i_atime.tv_sec = stat->st_atime_sec; 626 inode->i_atime.tv_nsec = stat->st_atime_nsec; 627 inode->i_mtime.tv_sec = stat->st_mtime_sec; 628 inode->i_mtime.tv_nsec = stat->st_mtime_nsec; 629 inode->i_ctime.tv_sec = stat->st_ctime_sec; 630 inode->i_ctime.tv_nsec = stat->st_ctime_nsec; 631 inode->i_uid = stat->st_uid; 632 inode->i_gid = stat->st_gid; 633 set_nlink(inode, stat->st_nlink); 634 635 mode = stat->st_mode & S_IALLUGO; 636 mode |= inode->i_mode & ~S_IALLUGO; 637 inode->i_mode = mode; 638 639 i_size_write(inode, stat->st_size); 640 inode->i_blocks = stat->st_blocks; 641 } else { 642 if (stat->st_result_mask & P9_STATS_ATIME) { 643 inode->i_atime.tv_sec = stat->st_atime_sec; 644 inode->i_atime.tv_nsec = stat->st_atime_nsec; 645 } 646 if (stat->st_result_mask & P9_STATS_MTIME) { 647 inode->i_mtime.tv_sec = stat->st_mtime_sec; 648 inode->i_mtime.tv_nsec = stat->st_mtime_nsec; 649 } 650 if (stat->st_result_mask & P9_STATS_CTIME) { 651 inode->i_ctime.tv_sec = stat->st_ctime_sec; 652 inode->i_ctime.tv_nsec = stat->st_ctime_nsec; 653 } 654 if (stat->st_result_mask & P9_STATS_UID) 655 inode->i_uid = stat->st_uid; 656 if (stat->st_result_mask & P9_STATS_GID) 657 inode->i_gid = stat->st_gid; 658 if (stat->st_result_mask & P9_STATS_NLINK) 659 set_nlink(inode, stat->st_nlink); 660 if (stat->st_result_mask & P9_STATS_MODE) { 661 inode->i_mode = stat->st_mode; 662 if ((S_ISBLK(inode->i_mode)) || 663 (S_ISCHR(inode->i_mode))) 664 init_special_inode(inode, inode->i_mode, 665 inode->i_rdev); 666 } 667 if (stat->st_result_mask & P9_STATS_RDEV) 668 inode->i_rdev = new_decode_dev(stat->st_rdev); 669 if (stat->st_result_mask & P9_STATS_SIZE) 670 i_size_write(inode, stat->st_size); 671 if (stat->st_result_mask & P9_STATS_BLOCKS) 672 inode->i_blocks = stat->st_blocks; 673 } 674 if (stat->st_result_mask & P9_STATS_GEN) 675 inode->i_generation = stat->st_gen; 676 677 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION 678 * because the inode structure does not have fields for them. 679 */ 680 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR; 681 } 682 683 static int 684 v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry, 685 const char *symname) 686 { 687 int err; 688 kgid_t gid; 689 char *name; 690 struct p9_qid qid; 691 struct inode *inode; 692 struct p9_fid *dfid; 693 struct p9_fid *fid = NULL; 694 struct v9fs_session_info *v9ses; 695 696 name = (char *) dentry->d_name.name; 697 p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname); 698 v9ses = v9fs_inode2v9ses(dir); 699 700 dfid = v9fs_fid_lookup(dentry->d_parent); 701 if (IS_ERR(dfid)) { 702 err = PTR_ERR(dfid); 703 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 704 return err; 705 } 706 707 gid = v9fs_get_fsgid_for_create(dir); 708 709 /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */ 710 err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid); 711 712 if (err < 0) { 713 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err); 714 goto error; 715 } 716 717 v9fs_invalidate_inode_attr(dir); 718 if (v9ses->cache) { 719 /* Now walk from the parent so we can get an unopened fid. */ 720 fid = p9_client_walk(dfid, 1, &name, 1); 721 if (IS_ERR(fid)) { 722 err = PTR_ERR(fid); 723 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", 724 err); 725 fid = NULL; 726 goto error; 727 } 728 729 /* instantiate inode and assign the unopened fid to dentry */ 730 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 731 if (IS_ERR(inode)) { 732 err = PTR_ERR(inode); 733 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", 734 err); 735 goto error; 736 } 737 v9fs_fid_add(dentry, fid); 738 d_instantiate(dentry, inode); 739 fid = NULL; 740 err = 0; 741 } else { 742 /* Not in cached mode. No need to populate inode with stat */ 743 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0); 744 if (IS_ERR(inode)) { 745 err = PTR_ERR(inode); 746 goto error; 747 } 748 d_instantiate(dentry, inode); 749 } 750 751 error: 752 if (fid) 753 p9_client_clunk(fid); 754 755 return err; 756 } 757 758 /** 759 * v9fs_vfs_link_dotl - create a hardlink for dotl 760 * @old_dentry: dentry for file to link to 761 * @dir: inode destination for new link 762 * @dentry: dentry for link 763 * 764 */ 765 766 static int 767 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir, 768 struct dentry *dentry) 769 { 770 int err; 771 char *name; 772 struct dentry *dir_dentry; 773 struct p9_fid *dfid, *oldfid; 774 struct v9fs_session_info *v9ses; 775 776 p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %s, new_name: %s\n", 777 dir->i_ino, old_dentry->d_name.name, dentry->d_name.name); 778 779 v9ses = v9fs_inode2v9ses(dir); 780 dir_dentry = dentry->d_parent; 781 dfid = v9fs_fid_lookup(dir_dentry); 782 if (IS_ERR(dfid)) 783 return PTR_ERR(dfid); 784 785 oldfid = v9fs_fid_lookup(old_dentry); 786 if (IS_ERR(oldfid)) 787 return PTR_ERR(oldfid); 788 789 name = (char *) dentry->d_name.name; 790 791 err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name); 792 793 if (err < 0) { 794 p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err); 795 return err; 796 } 797 798 v9fs_invalidate_inode_attr(dir); 799 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 800 /* Get the latest stat info from server. */ 801 struct p9_fid *fid; 802 fid = v9fs_fid_lookup(old_dentry); 803 if (IS_ERR(fid)) 804 return PTR_ERR(fid); 805 806 v9fs_refresh_inode_dotl(fid, old_dentry->d_inode); 807 } 808 ihold(old_dentry->d_inode); 809 d_instantiate(dentry, old_dentry->d_inode); 810 811 return err; 812 } 813 814 /** 815 * v9fs_vfs_mknod_dotl - create a special file 816 * @dir: inode destination for new link 817 * @dentry: dentry for file 818 * @mode: mode for creation 819 * @rdev: device associated with special file 820 * 821 */ 822 static int 823 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode, 824 dev_t rdev) 825 { 826 int err; 827 kgid_t gid; 828 char *name; 829 umode_t mode; 830 struct v9fs_session_info *v9ses; 831 struct p9_fid *fid = NULL, *dfid = NULL; 832 struct inode *inode; 833 struct p9_qid qid; 834 struct dentry *dir_dentry; 835 struct posix_acl *dacl = NULL, *pacl = NULL; 836 837 p9_debug(P9_DEBUG_VFS, " %lu,%s mode: %hx MAJOR: %u MINOR: %u\n", 838 dir->i_ino, dentry->d_name.name, omode, 839 MAJOR(rdev), MINOR(rdev)); 840 841 if (!new_valid_dev(rdev)) 842 return -EINVAL; 843 844 v9ses = v9fs_inode2v9ses(dir); 845 dir_dentry = dentry->d_parent; 846 dfid = v9fs_fid_lookup(dir_dentry); 847 if (IS_ERR(dfid)) { 848 err = PTR_ERR(dfid); 849 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 850 dfid = NULL; 851 goto error; 852 } 853 854 gid = v9fs_get_fsgid_for_create(dir); 855 mode = omode; 856 /* Update mode based on ACL value */ 857 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); 858 if (err) { 859 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n", 860 err); 861 goto error; 862 } 863 name = (char *) dentry->d_name.name; 864 865 err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid); 866 if (err < 0) 867 goto error; 868 869 v9fs_invalidate_inode_attr(dir); 870 fid = p9_client_walk(dfid, 1, &name, 1); 871 if (IS_ERR(fid)) { 872 err = PTR_ERR(fid); 873 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", 874 err); 875 fid = NULL; 876 goto error; 877 } 878 879 /* instantiate inode and assign the unopened fid to the dentry */ 880 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 881 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 882 if (IS_ERR(inode)) { 883 err = PTR_ERR(inode); 884 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", 885 err); 886 goto error; 887 } 888 v9fs_set_create_acl(inode, fid, dacl, pacl); 889 v9fs_fid_add(dentry, fid); 890 d_instantiate(dentry, inode); 891 fid = NULL; 892 err = 0; 893 } else { 894 /* 895 * Not in cached mode. No need to populate inode with stat. 896 * socket syscall returns a fd, so we need instantiate 897 */ 898 inode = v9fs_get_inode(dir->i_sb, mode, rdev); 899 if (IS_ERR(inode)) { 900 err = PTR_ERR(inode); 901 goto error; 902 } 903 v9fs_set_create_acl(inode, fid, dacl, pacl); 904 d_instantiate(dentry, inode); 905 } 906 error: 907 if (fid) 908 p9_client_clunk(fid); 909 v9fs_put_acl(dacl, pacl); 910 return err; 911 } 912 913 /** 914 * v9fs_vfs_follow_link_dotl - follow a symlink path 915 * @dentry: dentry for symlink 916 * @nd: nameidata 917 * 918 */ 919 920 static void * 921 v9fs_vfs_follow_link_dotl(struct dentry *dentry, struct nameidata *nd) 922 { 923 int retval; 924 struct p9_fid *fid; 925 char *link = __getname(); 926 char *target; 927 928 p9_debug(P9_DEBUG_VFS, "%s\n", dentry->d_name.name); 929 930 if (!link) { 931 link = ERR_PTR(-ENOMEM); 932 goto ndset; 933 } 934 fid = v9fs_fid_lookup(dentry); 935 if (IS_ERR(fid)) { 936 __putname(link); 937 link = ERR_CAST(fid); 938 goto ndset; 939 } 940 retval = p9_client_readlink(fid, &target); 941 if (!retval) { 942 strcpy(link, target); 943 kfree(target); 944 goto ndset; 945 } 946 __putname(link); 947 link = ERR_PTR(retval); 948 ndset: 949 nd_set_link(nd, link); 950 return NULL; 951 } 952 953 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode) 954 { 955 loff_t i_size; 956 struct p9_stat_dotl *st; 957 struct v9fs_session_info *v9ses; 958 959 v9ses = v9fs_inode2v9ses(inode); 960 st = p9_client_getattr_dotl(fid, P9_STATS_ALL); 961 if (IS_ERR(st)) 962 return PTR_ERR(st); 963 /* 964 * Don't update inode if the file type is different 965 */ 966 if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT)) 967 goto out; 968 969 spin_lock(&inode->i_lock); 970 /* 971 * We don't want to refresh inode->i_size, 972 * because we may have cached data 973 */ 974 i_size = inode->i_size; 975 v9fs_stat2inode_dotl(st, inode); 976 if (v9ses->cache) 977 inode->i_size = i_size; 978 spin_unlock(&inode->i_lock); 979 out: 980 kfree(st); 981 return 0; 982 } 983 984 const struct inode_operations v9fs_dir_inode_operations_dotl = { 985 .create = v9fs_vfs_create_dotl, 986 .atomic_open = v9fs_vfs_atomic_open_dotl, 987 .lookup = v9fs_vfs_lookup, 988 .link = v9fs_vfs_link_dotl, 989 .symlink = v9fs_vfs_symlink_dotl, 990 .unlink = v9fs_vfs_unlink, 991 .mkdir = v9fs_vfs_mkdir_dotl, 992 .rmdir = v9fs_vfs_rmdir, 993 .mknod = v9fs_vfs_mknod_dotl, 994 .rename = v9fs_vfs_rename, 995 .getattr = v9fs_vfs_getattr_dotl, 996 .setattr = v9fs_vfs_setattr_dotl, 997 .setxattr = generic_setxattr, 998 .getxattr = generic_getxattr, 999 .removexattr = generic_removexattr, 1000 .listxattr = v9fs_listxattr, 1001 .get_acl = v9fs_iop_get_acl, 1002 }; 1003 1004 const struct inode_operations v9fs_file_inode_operations_dotl = { 1005 .getattr = v9fs_vfs_getattr_dotl, 1006 .setattr = v9fs_vfs_setattr_dotl, 1007 .setxattr = generic_setxattr, 1008 .getxattr = generic_getxattr, 1009 .removexattr = generic_removexattr, 1010 .listxattr = v9fs_listxattr, 1011 .get_acl = v9fs_iop_get_acl, 1012 }; 1013 1014 const struct inode_operations v9fs_symlink_inode_operations_dotl = { 1015 .readlink = generic_readlink, 1016 .follow_link = v9fs_vfs_follow_link_dotl, 1017 .put_link = v9fs_vfs_put_link, 1018 .getattr = v9fs_vfs_getattr_dotl, 1019 .setattr = v9fs_vfs_setattr_dotl, 1020 .setxattr = generic_setxattr, 1021 .getxattr = generic_getxattr, 1022 .removexattr = generic_removexattr, 1023 .listxattr = v9fs_listxattr, 1024 }; 1025