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 #ifdef CONFIG_9P_FSCACHE 145 v9fs_cache_inode_get_cookie(inode); 146 #endif 147 retval = v9fs_get_acl(inode, fid); 148 if (retval) 149 goto error; 150 151 unlock_new_inode(inode); 152 return inode; 153 error: 154 unlock_new_inode(inode); 155 iput(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 * @mode: 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 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_unhashed(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)) 271 return finish_no_open(file, res); 272 else if (dentry->d_inode) { 273 if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) 274 return -EEXIST; 275 else 276 return finish_no_open(file, res); 277 } 278 279 v9ses = v9fs_inode2v9ses(dir); 280 281 name = (char *) dentry->d_name.name; 282 p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%hx\n", 283 name, flags, omode); 284 285 dfid = v9fs_fid_lookup(dentry->d_parent); 286 if (IS_ERR(dfid)) { 287 err = PTR_ERR(dfid); 288 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 289 goto out; 290 } 291 292 /* clone a fid to use for creation */ 293 ofid = p9_client_walk(dfid, 0, NULL, 1); 294 if (IS_ERR(ofid)) { 295 err = PTR_ERR(ofid); 296 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 297 goto out; 298 } 299 300 gid = v9fs_get_fsgid_for_create(dir); 301 302 mode = omode; 303 /* Update mode based on ACL value */ 304 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); 305 if (err) { 306 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in creat %d\n", 307 err); 308 goto error; 309 } 310 err = p9_client_create_dotl(ofid, name, v9fs_open_to_dotl_flags(flags), 311 mode, gid, &qid); 312 if (err < 0) { 313 p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in creat %d\n", 314 err); 315 goto error; 316 } 317 v9fs_invalidate_inode_attr(dir); 318 319 /* instantiate inode and assign the unopened fid to the dentry */ 320 fid = p9_client_walk(dfid, 1, &name, 1); 321 if (IS_ERR(fid)) { 322 err = PTR_ERR(fid); 323 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 324 fid = NULL; 325 goto error; 326 } 327 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 328 if (IS_ERR(inode)) { 329 err = PTR_ERR(inode); 330 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err); 331 goto error; 332 } 333 /* Now set the ACL based on the default value */ 334 v9fs_set_create_acl(inode, fid, dacl, pacl); 335 336 v9fs_fid_add(dentry, fid); 337 d_instantiate(dentry, inode); 338 339 v9inode = V9FS_I(inode); 340 mutex_lock(&v9inode->v_mutex); 341 if (v9ses->cache && !v9inode->writeback_fid && 342 ((flags & O_ACCMODE) != O_RDONLY)) { 343 /* 344 * clone a fid and add it to writeback_fid 345 * we do it during open time instead of 346 * page dirty time via write_begin/page_mkwrite 347 * because we want write after unlink usecase 348 * to work. 349 */ 350 inode_fid = v9fs_writeback_fid(dentry); 351 if (IS_ERR(inode_fid)) { 352 err = PTR_ERR(inode_fid); 353 mutex_unlock(&v9inode->v_mutex); 354 goto err_clunk_old_fid; 355 } 356 v9inode->writeback_fid = (void *) inode_fid; 357 } 358 mutex_unlock(&v9inode->v_mutex); 359 /* Since we are opening a file, assign the open fid to the file */ 360 err = finish_open(file, dentry, generic_file_open, opened); 361 if (err) 362 goto err_clunk_old_fid; 363 file->private_data = ofid; 364 #ifdef CONFIG_9P_FSCACHE 365 if (v9ses->cache) 366 v9fs_cache_inode_set_cookie(inode, file); 367 #endif 368 *opened |= FILE_CREATED; 369 out: 370 v9fs_put_acl(dacl, pacl); 371 dput(res); 372 return err; 373 374 error: 375 if (fid) 376 p9_client_clunk(fid); 377 err_clunk_old_fid: 378 if (ofid) 379 p9_client_clunk(ofid); 380 goto out; 381 } 382 383 /** 384 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory 385 * @dir: inode that is being unlinked 386 * @dentry: dentry that is being unlinked 387 * @mode: mode for new directory 388 * 389 */ 390 391 static int v9fs_vfs_mkdir_dotl(struct inode *dir, 392 struct dentry *dentry, umode_t omode) 393 { 394 int err; 395 struct v9fs_session_info *v9ses; 396 struct p9_fid *fid = NULL, *dfid = NULL; 397 kgid_t gid; 398 char *name; 399 umode_t mode; 400 struct inode *inode; 401 struct p9_qid qid; 402 struct dentry *dir_dentry; 403 struct posix_acl *dacl = NULL, *pacl = NULL; 404 405 p9_debug(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); 406 err = 0; 407 v9ses = v9fs_inode2v9ses(dir); 408 409 omode |= S_IFDIR; 410 if (dir->i_mode & S_ISGID) 411 omode |= S_ISGID; 412 413 dir_dentry = dentry->d_parent; 414 dfid = v9fs_fid_lookup(dir_dentry); 415 if (IS_ERR(dfid)) { 416 err = PTR_ERR(dfid); 417 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 418 dfid = NULL; 419 goto error; 420 } 421 422 gid = v9fs_get_fsgid_for_create(dir); 423 mode = omode; 424 /* Update mode based on ACL value */ 425 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); 426 if (err) { 427 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n", 428 err); 429 goto error; 430 } 431 name = (char *) dentry->d_name.name; 432 err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid); 433 if (err < 0) 434 goto error; 435 436 fid = p9_client_walk(dfid, 1, &name, 1); 437 if (IS_ERR(fid)) { 438 err = PTR_ERR(fid); 439 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", 440 err); 441 fid = NULL; 442 goto error; 443 } 444 445 /* instantiate inode and assign the unopened fid to the dentry */ 446 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 447 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 448 if (IS_ERR(inode)) { 449 err = PTR_ERR(inode); 450 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", 451 err); 452 goto error; 453 } 454 v9fs_fid_add(dentry, fid); 455 v9fs_set_create_acl(inode, fid, dacl, pacl); 456 d_instantiate(dentry, inode); 457 fid = NULL; 458 err = 0; 459 } else { 460 /* 461 * Not in cached mode. No need to populate 462 * inode with stat. We need to get an inode 463 * so that we can set the acl with dentry 464 */ 465 inode = v9fs_get_inode(dir->i_sb, mode, 0); 466 if (IS_ERR(inode)) { 467 err = PTR_ERR(inode); 468 goto error; 469 } 470 v9fs_set_create_acl(inode, fid, dacl, pacl); 471 d_instantiate(dentry, inode); 472 } 473 inc_nlink(dir); 474 v9fs_invalidate_inode_attr(dir); 475 error: 476 if (fid) 477 p9_client_clunk(fid); 478 v9fs_put_acl(dacl, pacl); 479 return err; 480 } 481 482 static int 483 v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry, 484 struct kstat *stat) 485 { 486 int err; 487 struct v9fs_session_info *v9ses; 488 struct p9_fid *fid; 489 struct p9_stat_dotl *st; 490 491 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry); 492 err = -EPERM; 493 v9ses = v9fs_dentry2v9ses(dentry); 494 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 495 generic_fillattr(dentry->d_inode, stat); 496 return 0; 497 } 498 fid = v9fs_fid_lookup(dentry); 499 if (IS_ERR(fid)) 500 return PTR_ERR(fid); 501 502 /* Ask for all the fields in stat structure. Server will return 503 * whatever it supports 504 */ 505 506 st = p9_client_getattr_dotl(fid, P9_STATS_ALL); 507 if (IS_ERR(st)) 508 return PTR_ERR(st); 509 510 v9fs_stat2inode_dotl(st, dentry->d_inode); 511 generic_fillattr(dentry->d_inode, stat); 512 /* Change block size to what the server returned */ 513 stat->blksize = st->st_blksize; 514 515 kfree(st); 516 return 0; 517 } 518 519 /* 520 * Attribute flags. 521 */ 522 #define P9_ATTR_MODE (1 << 0) 523 #define P9_ATTR_UID (1 << 1) 524 #define P9_ATTR_GID (1 << 2) 525 #define P9_ATTR_SIZE (1 << 3) 526 #define P9_ATTR_ATIME (1 << 4) 527 #define P9_ATTR_MTIME (1 << 5) 528 #define P9_ATTR_CTIME (1 << 6) 529 #define P9_ATTR_ATIME_SET (1 << 7) 530 #define P9_ATTR_MTIME_SET (1 << 8) 531 532 struct dotl_iattr_map { 533 int iattr_valid; 534 int p9_iattr_valid; 535 }; 536 537 static int v9fs_mapped_iattr_valid(int iattr_valid) 538 { 539 int i; 540 int p9_iattr_valid = 0; 541 struct dotl_iattr_map dotl_iattr_map[] = { 542 { ATTR_MODE, P9_ATTR_MODE }, 543 { ATTR_UID, P9_ATTR_UID }, 544 { ATTR_GID, P9_ATTR_GID }, 545 { ATTR_SIZE, P9_ATTR_SIZE }, 546 { ATTR_ATIME, P9_ATTR_ATIME }, 547 { ATTR_MTIME, P9_ATTR_MTIME }, 548 { ATTR_CTIME, P9_ATTR_CTIME }, 549 { ATTR_ATIME_SET, P9_ATTR_ATIME_SET }, 550 { ATTR_MTIME_SET, P9_ATTR_MTIME_SET }, 551 }; 552 for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) { 553 if (iattr_valid & dotl_iattr_map[i].iattr_valid) 554 p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid; 555 } 556 return p9_iattr_valid; 557 } 558 559 /** 560 * v9fs_vfs_setattr_dotl - set file metadata 561 * @dentry: file whose metadata to set 562 * @iattr: metadata assignment structure 563 * 564 */ 565 566 int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr) 567 { 568 int retval; 569 struct v9fs_session_info *v9ses; 570 struct p9_fid *fid; 571 struct p9_iattr_dotl p9attr; 572 struct inode *inode = dentry->d_inode; 573 574 p9_debug(P9_DEBUG_VFS, "\n"); 575 576 retval = inode_change_ok(inode, iattr); 577 if (retval) 578 return retval; 579 580 p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid); 581 p9attr.mode = iattr->ia_mode; 582 p9attr.uid = iattr->ia_uid; 583 p9attr.gid = iattr->ia_gid; 584 p9attr.size = iattr->ia_size; 585 p9attr.atime_sec = iattr->ia_atime.tv_sec; 586 p9attr.atime_nsec = iattr->ia_atime.tv_nsec; 587 p9attr.mtime_sec = iattr->ia_mtime.tv_sec; 588 p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec; 589 590 retval = -EPERM; 591 v9ses = v9fs_dentry2v9ses(dentry); 592 fid = v9fs_fid_lookup(dentry); 593 if (IS_ERR(fid)) 594 return PTR_ERR(fid); 595 596 /* Write all dirty data */ 597 if (S_ISREG(inode->i_mode)) 598 filemap_write_and_wait(inode->i_mapping); 599 600 retval = p9_client_setattr(fid, &p9attr); 601 if (retval < 0) 602 return retval; 603 604 if ((iattr->ia_valid & ATTR_SIZE) && 605 iattr->ia_size != i_size_read(inode)) 606 truncate_setsize(inode, iattr->ia_size); 607 608 v9fs_invalidate_inode_attr(inode); 609 setattr_copy(inode, iattr); 610 mark_inode_dirty(inode); 611 if (iattr->ia_valid & ATTR_MODE) { 612 /* We also want to update ACL when we update mode bits */ 613 retval = v9fs_acl_chmod(inode, fid); 614 if (retval < 0) 615 return retval; 616 } 617 return 0; 618 } 619 620 /** 621 * v9fs_stat2inode_dotl - populate an inode structure with stat info 622 * @stat: stat structure 623 * @inode: inode to populate 624 * @sb: superblock of filesystem 625 * 626 */ 627 628 void 629 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode) 630 { 631 umode_t mode; 632 struct v9fs_inode *v9inode = V9FS_I(inode); 633 634 if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) { 635 inode->i_atime.tv_sec = stat->st_atime_sec; 636 inode->i_atime.tv_nsec = stat->st_atime_nsec; 637 inode->i_mtime.tv_sec = stat->st_mtime_sec; 638 inode->i_mtime.tv_nsec = stat->st_mtime_nsec; 639 inode->i_ctime.tv_sec = stat->st_ctime_sec; 640 inode->i_ctime.tv_nsec = stat->st_ctime_nsec; 641 inode->i_uid = stat->st_uid; 642 inode->i_gid = stat->st_gid; 643 set_nlink(inode, stat->st_nlink); 644 645 mode = stat->st_mode & S_IALLUGO; 646 mode |= inode->i_mode & ~S_IALLUGO; 647 inode->i_mode = mode; 648 649 i_size_write(inode, stat->st_size); 650 inode->i_blocks = stat->st_blocks; 651 } else { 652 if (stat->st_result_mask & P9_STATS_ATIME) { 653 inode->i_atime.tv_sec = stat->st_atime_sec; 654 inode->i_atime.tv_nsec = stat->st_atime_nsec; 655 } 656 if (stat->st_result_mask & P9_STATS_MTIME) { 657 inode->i_mtime.tv_sec = stat->st_mtime_sec; 658 inode->i_mtime.tv_nsec = stat->st_mtime_nsec; 659 } 660 if (stat->st_result_mask & P9_STATS_CTIME) { 661 inode->i_ctime.tv_sec = stat->st_ctime_sec; 662 inode->i_ctime.tv_nsec = stat->st_ctime_nsec; 663 } 664 if (stat->st_result_mask & P9_STATS_UID) 665 inode->i_uid = stat->st_uid; 666 if (stat->st_result_mask & P9_STATS_GID) 667 inode->i_gid = stat->st_gid; 668 if (stat->st_result_mask & P9_STATS_NLINK) 669 set_nlink(inode, stat->st_nlink); 670 if (stat->st_result_mask & P9_STATS_MODE) { 671 inode->i_mode = stat->st_mode; 672 if ((S_ISBLK(inode->i_mode)) || 673 (S_ISCHR(inode->i_mode))) 674 init_special_inode(inode, inode->i_mode, 675 inode->i_rdev); 676 } 677 if (stat->st_result_mask & P9_STATS_RDEV) 678 inode->i_rdev = new_decode_dev(stat->st_rdev); 679 if (stat->st_result_mask & P9_STATS_SIZE) 680 i_size_write(inode, stat->st_size); 681 if (stat->st_result_mask & P9_STATS_BLOCKS) 682 inode->i_blocks = stat->st_blocks; 683 } 684 if (stat->st_result_mask & P9_STATS_GEN) 685 inode->i_generation = stat->st_gen; 686 687 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION 688 * because the inode structure does not have fields for them. 689 */ 690 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR; 691 } 692 693 static int 694 v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry, 695 const char *symname) 696 { 697 int err; 698 kgid_t gid; 699 char *name; 700 struct p9_qid qid; 701 struct inode *inode; 702 struct p9_fid *dfid; 703 struct p9_fid *fid = NULL; 704 struct v9fs_session_info *v9ses; 705 706 name = (char *) dentry->d_name.name; 707 p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname); 708 v9ses = v9fs_inode2v9ses(dir); 709 710 dfid = v9fs_fid_lookup(dentry->d_parent); 711 if (IS_ERR(dfid)) { 712 err = PTR_ERR(dfid); 713 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 714 return err; 715 } 716 717 gid = v9fs_get_fsgid_for_create(dir); 718 719 /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */ 720 err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid); 721 722 if (err < 0) { 723 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err); 724 goto error; 725 } 726 727 v9fs_invalidate_inode_attr(dir); 728 if (v9ses->cache) { 729 /* Now walk from the parent so we can get an unopened fid. */ 730 fid = p9_client_walk(dfid, 1, &name, 1); 731 if (IS_ERR(fid)) { 732 err = PTR_ERR(fid); 733 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", 734 err); 735 fid = NULL; 736 goto error; 737 } 738 739 /* instantiate inode and assign the unopened fid to dentry */ 740 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 741 if (IS_ERR(inode)) { 742 err = PTR_ERR(inode); 743 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", 744 err); 745 goto error; 746 } 747 v9fs_fid_add(dentry, fid); 748 d_instantiate(dentry, inode); 749 fid = NULL; 750 err = 0; 751 } else { 752 /* Not in cached mode. No need to populate inode with stat */ 753 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0); 754 if (IS_ERR(inode)) { 755 err = PTR_ERR(inode); 756 goto error; 757 } 758 d_instantiate(dentry, inode); 759 } 760 761 error: 762 if (fid) 763 p9_client_clunk(fid); 764 765 return err; 766 } 767 768 /** 769 * v9fs_vfs_link_dotl - create a hardlink for dotl 770 * @old_dentry: dentry for file to link to 771 * @dir: inode destination for new link 772 * @dentry: dentry for link 773 * 774 */ 775 776 static int 777 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir, 778 struct dentry *dentry) 779 { 780 int err; 781 char *name; 782 struct dentry *dir_dentry; 783 struct p9_fid *dfid, *oldfid; 784 struct v9fs_session_info *v9ses; 785 786 p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %s, new_name: %s\n", 787 dir->i_ino, old_dentry->d_name.name, dentry->d_name.name); 788 789 v9ses = v9fs_inode2v9ses(dir); 790 dir_dentry = dentry->d_parent; 791 dfid = v9fs_fid_lookup(dir_dentry); 792 if (IS_ERR(dfid)) 793 return PTR_ERR(dfid); 794 795 oldfid = v9fs_fid_lookup(old_dentry); 796 if (IS_ERR(oldfid)) 797 return PTR_ERR(oldfid); 798 799 name = (char *) dentry->d_name.name; 800 801 err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name); 802 803 if (err < 0) { 804 p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err); 805 return err; 806 } 807 808 v9fs_invalidate_inode_attr(dir); 809 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 810 /* Get the latest stat info from server. */ 811 struct p9_fid *fid; 812 fid = v9fs_fid_lookup(old_dentry); 813 if (IS_ERR(fid)) 814 return PTR_ERR(fid); 815 816 v9fs_refresh_inode_dotl(fid, old_dentry->d_inode); 817 } 818 ihold(old_dentry->d_inode); 819 d_instantiate(dentry, old_dentry->d_inode); 820 821 return err; 822 } 823 824 /** 825 * v9fs_vfs_mknod_dotl - create a special file 826 * @dir: inode destination for new link 827 * @dentry: dentry for file 828 * @mode: mode for creation 829 * @rdev: device associated with special file 830 * 831 */ 832 static int 833 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode, 834 dev_t rdev) 835 { 836 int err; 837 kgid_t gid; 838 char *name; 839 umode_t mode; 840 struct v9fs_session_info *v9ses; 841 struct p9_fid *fid = NULL, *dfid = NULL; 842 struct inode *inode; 843 struct p9_qid qid; 844 struct dentry *dir_dentry; 845 struct posix_acl *dacl = NULL, *pacl = NULL; 846 847 p9_debug(P9_DEBUG_VFS, " %lu,%s mode: %hx MAJOR: %u MINOR: %u\n", 848 dir->i_ino, dentry->d_name.name, omode, 849 MAJOR(rdev), MINOR(rdev)); 850 851 if (!new_valid_dev(rdev)) 852 return -EINVAL; 853 854 v9ses = v9fs_inode2v9ses(dir); 855 dir_dentry = dentry->d_parent; 856 dfid = v9fs_fid_lookup(dir_dentry); 857 if (IS_ERR(dfid)) { 858 err = PTR_ERR(dfid); 859 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 860 dfid = NULL; 861 goto error; 862 } 863 864 gid = v9fs_get_fsgid_for_create(dir); 865 mode = omode; 866 /* Update mode based on ACL value */ 867 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); 868 if (err) { 869 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n", 870 err); 871 goto error; 872 } 873 name = (char *) dentry->d_name.name; 874 875 err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid); 876 if (err < 0) 877 goto error; 878 879 v9fs_invalidate_inode_attr(dir); 880 fid = p9_client_walk(dfid, 1, &name, 1); 881 if (IS_ERR(fid)) { 882 err = PTR_ERR(fid); 883 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", 884 err); 885 fid = NULL; 886 goto error; 887 } 888 889 /* instantiate inode and assign the unopened fid to the dentry */ 890 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 891 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 892 if (IS_ERR(inode)) { 893 err = PTR_ERR(inode); 894 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", 895 err); 896 goto error; 897 } 898 v9fs_set_create_acl(inode, fid, dacl, pacl); 899 v9fs_fid_add(dentry, fid); 900 d_instantiate(dentry, inode); 901 fid = NULL; 902 err = 0; 903 } else { 904 /* 905 * Not in cached mode. No need to populate inode with stat. 906 * socket syscall returns a fd, so we need instantiate 907 */ 908 inode = v9fs_get_inode(dir->i_sb, mode, rdev); 909 if (IS_ERR(inode)) { 910 err = PTR_ERR(inode); 911 goto error; 912 } 913 v9fs_set_create_acl(inode, fid, dacl, pacl); 914 d_instantiate(dentry, inode); 915 } 916 error: 917 if (fid) 918 p9_client_clunk(fid); 919 v9fs_put_acl(dacl, pacl); 920 return err; 921 } 922 923 /** 924 * v9fs_vfs_follow_link_dotl - follow a symlink path 925 * @dentry: dentry for symlink 926 * @nd: nameidata 927 * 928 */ 929 930 static void * 931 v9fs_vfs_follow_link_dotl(struct dentry *dentry, struct nameidata *nd) 932 { 933 int retval; 934 struct p9_fid *fid; 935 char *link = __getname(); 936 char *target; 937 938 p9_debug(P9_DEBUG_VFS, "%s\n", dentry->d_name.name); 939 940 if (!link) { 941 link = ERR_PTR(-ENOMEM); 942 goto ndset; 943 } 944 fid = v9fs_fid_lookup(dentry); 945 if (IS_ERR(fid)) { 946 __putname(link); 947 link = ERR_CAST(fid); 948 goto ndset; 949 } 950 retval = p9_client_readlink(fid, &target); 951 if (!retval) { 952 strcpy(link, target); 953 kfree(target); 954 goto ndset; 955 } 956 __putname(link); 957 link = ERR_PTR(retval); 958 ndset: 959 nd_set_link(nd, link); 960 return NULL; 961 } 962 963 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode) 964 { 965 loff_t i_size; 966 struct p9_stat_dotl *st; 967 struct v9fs_session_info *v9ses; 968 969 v9ses = v9fs_inode2v9ses(inode); 970 st = p9_client_getattr_dotl(fid, P9_STATS_ALL); 971 if (IS_ERR(st)) 972 return PTR_ERR(st); 973 /* 974 * Don't update inode if the file type is different 975 */ 976 if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT)) 977 goto out; 978 979 spin_lock(&inode->i_lock); 980 /* 981 * We don't want to refresh inode->i_size, 982 * because we may have cached data 983 */ 984 i_size = inode->i_size; 985 v9fs_stat2inode_dotl(st, inode); 986 if (v9ses->cache) 987 inode->i_size = i_size; 988 spin_unlock(&inode->i_lock); 989 out: 990 kfree(st); 991 return 0; 992 } 993 994 const struct inode_operations v9fs_dir_inode_operations_dotl = { 995 .create = v9fs_vfs_create_dotl, 996 .atomic_open = v9fs_vfs_atomic_open_dotl, 997 .lookup = v9fs_vfs_lookup, 998 .link = v9fs_vfs_link_dotl, 999 .symlink = v9fs_vfs_symlink_dotl, 1000 .unlink = v9fs_vfs_unlink, 1001 .mkdir = v9fs_vfs_mkdir_dotl, 1002 .rmdir = v9fs_vfs_rmdir, 1003 .mknod = v9fs_vfs_mknod_dotl, 1004 .rename = v9fs_vfs_rename, 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_file_inode_operations_dotl = { 1015 .getattr = v9fs_vfs_getattr_dotl, 1016 .setattr = v9fs_vfs_setattr_dotl, 1017 .setxattr = generic_setxattr, 1018 .getxattr = generic_getxattr, 1019 .removexattr = generic_removexattr, 1020 .listxattr = v9fs_listxattr, 1021 .get_acl = v9fs_iop_get_acl, 1022 }; 1023 1024 const struct inode_operations v9fs_symlink_inode_operations_dotl = { 1025 .readlink = generic_readlink, 1026 .follow_link = v9fs_vfs_follow_link_dotl, 1027 .put_link = v9fs_vfs_put_link, 1028 .getattr = v9fs_vfs_getattr_dotl, 1029 .setattr = v9fs_vfs_setattr_dotl, 1030 .setxattr = generic_setxattr, 1031 .getxattr = generic_getxattr, 1032 .removexattr = generic_removexattr, 1033 .listxattr = v9fs_listxattr, 1034 }; 1035