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 gid_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 gid_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 err = v9fs_fid_add(dentry, fid); 334 if (err < 0) 335 goto error; 336 d_instantiate(dentry, inode); 337 338 /* Now set the ACL based on the default value */ 339 v9fs_set_create_acl(dentry, &dacl, &pacl); 340 341 v9inode = V9FS_I(inode); 342 mutex_lock(&v9inode->v_mutex); 343 if (v9ses->cache && !v9inode->writeback_fid && 344 ((flags & O_ACCMODE) != O_RDONLY)) { 345 /* 346 * clone a fid and add it to writeback_fid 347 * we do it during open time instead of 348 * page dirty time via write_begin/page_mkwrite 349 * because we want write after unlink usecase 350 * to work. 351 */ 352 inode_fid = v9fs_writeback_fid(dentry); 353 if (IS_ERR(inode_fid)) { 354 err = PTR_ERR(inode_fid); 355 mutex_unlock(&v9inode->v_mutex); 356 goto err_clunk_old_fid; 357 } 358 v9inode->writeback_fid = (void *) inode_fid; 359 } 360 mutex_unlock(&v9inode->v_mutex); 361 /* Since we are opening a file, assign the open fid to the file */ 362 err = finish_open(file, dentry, generic_file_open, opened); 363 if (err) 364 goto err_clunk_old_fid; 365 file->private_data = ofid; 366 #ifdef CONFIG_9P_FSCACHE 367 if (v9ses->cache) 368 v9fs_cache_inode_set_cookie(inode, file); 369 #endif 370 *opened |= FILE_CREATED; 371 out: 372 dput(res); 373 return err; 374 375 error: 376 if (fid) 377 p9_client_clunk(fid); 378 err_clunk_old_fid: 379 if (ofid) 380 p9_client_clunk(ofid); 381 v9fs_set_create_acl(NULL, &dacl, &pacl); 382 goto out; 383 } 384 385 /** 386 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory 387 * @dir: inode that is being unlinked 388 * @dentry: dentry that is being unlinked 389 * @mode: mode for new directory 390 * 391 */ 392 393 static int v9fs_vfs_mkdir_dotl(struct inode *dir, 394 struct dentry *dentry, umode_t omode) 395 { 396 int err; 397 struct v9fs_session_info *v9ses; 398 struct p9_fid *fid = NULL, *dfid = NULL; 399 gid_t gid; 400 char *name; 401 umode_t mode; 402 struct inode *inode; 403 struct p9_qid qid; 404 struct dentry *dir_dentry; 405 struct posix_acl *dacl = NULL, *pacl = NULL; 406 407 p9_debug(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); 408 err = 0; 409 v9ses = v9fs_inode2v9ses(dir); 410 411 omode |= S_IFDIR; 412 if (dir->i_mode & S_ISGID) 413 omode |= S_ISGID; 414 415 dir_dentry = dentry->d_parent; 416 dfid = v9fs_fid_lookup(dir_dentry); 417 if (IS_ERR(dfid)) { 418 err = PTR_ERR(dfid); 419 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 420 dfid = NULL; 421 goto error; 422 } 423 424 gid = v9fs_get_fsgid_for_create(dir); 425 mode = omode; 426 /* Update mode based on ACL value */ 427 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); 428 if (err) { 429 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n", 430 err); 431 goto error; 432 } 433 name = (char *) dentry->d_name.name; 434 err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid); 435 if (err < 0) 436 goto error; 437 438 /* instantiate inode and assign the unopened fid to the dentry */ 439 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 440 fid = p9_client_walk(dfid, 1, &name, 1); 441 if (IS_ERR(fid)) { 442 err = PTR_ERR(fid); 443 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", 444 err); 445 fid = NULL; 446 goto error; 447 } 448 449 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 450 if (IS_ERR(inode)) { 451 err = PTR_ERR(inode); 452 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", 453 err); 454 goto error; 455 } 456 err = v9fs_fid_add(dentry, fid); 457 if (err < 0) 458 goto error; 459 d_instantiate(dentry, inode); 460 fid = NULL; 461 } else { 462 /* 463 * Not in cached mode. No need to populate 464 * inode with stat. We need to get an inode 465 * so that we can set the acl with dentry 466 */ 467 inode = v9fs_get_inode(dir->i_sb, mode, 0); 468 if (IS_ERR(inode)) { 469 err = PTR_ERR(inode); 470 goto error; 471 } 472 d_instantiate(dentry, inode); 473 } 474 /* Now set the ACL based on the default value */ 475 v9fs_set_create_acl(dentry, &dacl, &pacl); 476 inc_nlink(dir); 477 v9fs_invalidate_inode_attr(dir); 478 error: 479 if (fid) 480 p9_client_clunk(fid); 481 v9fs_set_create_acl(NULL, &dacl, &pacl); 482 return err; 483 } 484 485 static int 486 v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry, 487 struct kstat *stat) 488 { 489 int err; 490 struct v9fs_session_info *v9ses; 491 struct p9_fid *fid; 492 struct p9_stat_dotl *st; 493 494 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry); 495 err = -EPERM; 496 v9ses = v9fs_dentry2v9ses(dentry); 497 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 498 generic_fillattr(dentry->d_inode, stat); 499 return 0; 500 } 501 fid = v9fs_fid_lookup(dentry); 502 if (IS_ERR(fid)) 503 return PTR_ERR(fid); 504 505 /* Ask for all the fields in stat structure. Server will return 506 * whatever it supports 507 */ 508 509 st = p9_client_getattr_dotl(fid, P9_STATS_ALL); 510 if (IS_ERR(st)) 511 return PTR_ERR(st); 512 513 v9fs_stat2inode_dotl(st, dentry->d_inode); 514 generic_fillattr(dentry->d_inode, stat); 515 /* Change block size to what the server returned */ 516 stat->blksize = st->st_blksize; 517 518 kfree(st); 519 return 0; 520 } 521 522 /* 523 * Attribute flags. 524 */ 525 #define P9_ATTR_MODE (1 << 0) 526 #define P9_ATTR_UID (1 << 1) 527 #define P9_ATTR_GID (1 << 2) 528 #define P9_ATTR_SIZE (1 << 3) 529 #define P9_ATTR_ATIME (1 << 4) 530 #define P9_ATTR_MTIME (1 << 5) 531 #define P9_ATTR_CTIME (1 << 6) 532 #define P9_ATTR_ATIME_SET (1 << 7) 533 #define P9_ATTR_MTIME_SET (1 << 8) 534 535 struct dotl_iattr_map { 536 int iattr_valid; 537 int p9_iattr_valid; 538 }; 539 540 static int v9fs_mapped_iattr_valid(int iattr_valid) 541 { 542 int i; 543 int p9_iattr_valid = 0; 544 struct dotl_iattr_map dotl_iattr_map[] = { 545 { ATTR_MODE, P9_ATTR_MODE }, 546 { ATTR_UID, P9_ATTR_UID }, 547 { ATTR_GID, P9_ATTR_GID }, 548 { ATTR_SIZE, P9_ATTR_SIZE }, 549 { ATTR_ATIME, P9_ATTR_ATIME }, 550 { ATTR_MTIME, P9_ATTR_MTIME }, 551 { ATTR_CTIME, P9_ATTR_CTIME }, 552 { ATTR_ATIME_SET, P9_ATTR_ATIME_SET }, 553 { ATTR_MTIME_SET, P9_ATTR_MTIME_SET }, 554 }; 555 for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) { 556 if (iattr_valid & dotl_iattr_map[i].iattr_valid) 557 p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid; 558 } 559 return p9_iattr_valid; 560 } 561 562 /** 563 * v9fs_vfs_setattr_dotl - set file metadata 564 * @dentry: file whose metadata to set 565 * @iattr: metadata assignment structure 566 * 567 */ 568 569 int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr) 570 { 571 int retval; 572 struct v9fs_session_info *v9ses; 573 struct p9_fid *fid; 574 struct p9_iattr_dotl p9attr; 575 576 p9_debug(P9_DEBUG_VFS, "\n"); 577 578 retval = inode_change_ok(dentry->d_inode, iattr); 579 if (retval) 580 return retval; 581 582 p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid); 583 p9attr.mode = iattr->ia_mode; 584 p9attr.uid = iattr->ia_uid; 585 p9attr.gid = iattr->ia_gid; 586 p9attr.size = iattr->ia_size; 587 p9attr.atime_sec = iattr->ia_atime.tv_sec; 588 p9attr.atime_nsec = iattr->ia_atime.tv_nsec; 589 p9attr.mtime_sec = iattr->ia_mtime.tv_sec; 590 p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec; 591 592 retval = -EPERM; 593 v9ses = v9fs_dentry2v9ses(dentry); 594 fid = v9fs_fid_lookup(dentry); 595 if (IS_ERR(fid)) 596 return PTR_ERR(fid); 597 598 /* Write all dirty data */ 599 if (S_ISREG(dentry->d_inode->i_mode)) 600 filemap_write_and_wait(dentry->d_inode->i_mapping); 601 602 retval = p9_client_setattr(fid, &p9attr); 603 if (retval < 0) 604 return retval; 605 606 if ((iattr->ia_valid & ATTR_SIZE) && 607 iattr->ia_size != i_size_read(dentry->d_inode)) 608 truncate_setsize(dentry->d_inode, iattr->ia_size); 609 610 v9fs_invalidate_inode_attr(dentry->d_inode); 611 setattr_copy(dentry->d_inode, iattr); 612 mark_inode_dirty(dentry->d_inode); 613 if (iattr->ia_valid & ATTR_MODE) { 614 /* We also want to update ACL when we update mode bits */ 615 retval = v9fs_acl_chmod(dentry); 616 if (retval < 0) 617 return retval; 618 } 619 return 0; 620 } 621 622 /** 623 * v9fs_stat2inode_dotl - populate an inode structure with stat info 624 * @stat: stat structure 625 * @inode: inode to populate 626 * @sb: superblock of filesystem 627 * 628 */ 629 630 void 631 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode) 632 { 633 umode_t mode; 634 struct v9fs_inode *v9inode = V9FS_I(inode); 635 636 if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) { 637 inode->i_atime.tv_sec = stat->st_atime_sec; 638 inode->i_atime.tv_nsec = stat->st_atime_nsec; 639 inode->i_mtime.tv_sec = stat->st_mtime_sec; 640 inode->i_mtime.tv_nsec = stat->st_mtime_nsec; 641 inode->i_ctime.tv_sec = stat->st_ctime_sec; 642 inode->i_ctime.tv_nsec = stat->st_ctime_nsec; 643 inode->i_uid = stat->st_uid; 644 inode->i_gid = stat->st_gid; 645 set_nlink(inode, stat->st_nlink); 646 647 mode = stat->st_mode & S_IALLUGO; 648 mode |= inode->i_mode & ~S_IALLUGO; 649 inode->i_mode = mode; 650 651 i_size_write(inode, stat->st_size); 652 inode->i_blocks = stat->st_blocks; 653 } else { 654 if (stat->st_result_mask & P9_STATS_ATIME) { 655 inode->i_atime.tv_sec = stat->st_atime_sec; 656 inode->i_atime.tv_nsec = stat->st_atime_nsec; 657 } 658 if (stat->st_result_mask & P9_STATS_MTIME) { 659 inode->i_mtime.tv_sec = stat->st_mtime_sec; 660 inode->i_mtime.tv_nsec = stat->st_mtime_nsec; 661 } 662 if (stat->st_result_mask & P9_STATS_CTIME) { 663 inode->i_ctime.tv_sec = stat->st_ctime_sec; 664 inode->i_ctime.tv_nsec = stat->st_ctime_nsec; 665 } 666 if (stat->st_result_mask & P9_STATS_UID) 667 inode->i_uid = stat->st_uid; 668 if (stat->st_result_mask & P9_STATS_GID) 669 inode->i_gid = stat->st_gid; 670 if (stat->st_result_mask & P9_STATS_NLINK) 671 set_nlink(inode, stat->st_nlink); 672 if (stat->st_result_mask & P9_STATS_MODE) { 673 inode->i_mode = stat->st_mode; 674 if ((S_ISBLK(inode->i_mode)) || 675 (S_ISCHR(inode->i_mode))) 676 init_special_inode(inode, inode->i_mode, 677 inode->i_rdev); 678 } 679 if (stat->st_result_mask & P9_STATS_RDEV) 680 inode->i_rdev = new_decode_dev(stat->st_rdev); 681 if (stat->st_result_mask & P9_STATS_SIZE) 682 i_size_write(inode, stat->st_size); 683 if (stat->st_result_mask & P9_STATS_BLOCKS) 684 inode->i_blocks = stat->st_blocks; 685 } 686 if (stat->st_result_mask & P9_STATS_GEN) 687 inode->i_generation = stat->st_gen; 688 689 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION 690 * because the inode structure does not have fields for them. 691 */ 692 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR; 693 } 694 695 static int 696 v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry, 697 const char *symname) 698 { 699 int err; 700 gid_t gid; 701 char *name; 702 struct p9_qid qid; 703 struct inode *inode; 704 struct p9_fid *dfid; 705 struct p9_fid *fid = NULL; 706 struct v9fs_session_info *v9ses; 707 708 name = (char *) dentry->d_name.name; 709 p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname); 710 v9ses = v9fs_inode2v9ses(dir); 711 712 dfid = v9fs_fid_lookup(dentry->d_parent); 713 if (IS_ERR(dfid)) { 714 err = PTR_ERR(dfid); 715 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 716 return err; 717 } 718 719 gid = v9fs_get_fsgid_for_create(dir); 720 721 /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */ 722 err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid); 723 724 if (err < 0) { 725 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err); 726 goto error; 727 } 728 729 v9fs_invalidate_inode_attr(dir); 730 if (v9ses->cache) { 731 /* Now walk from the parent so we can get an unopened fid. */ 732 fid = p9_client_walk(dfid, 1, &name, 1); 733 if (IS_ERR(fid)) { 734 err = PTR_ERR(fid); 735 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", 736 err); 737 fid = NULL; 738 goto error; 739 } 740 741 /* instantiate inode and assign the unopened fid to dentry */ 742 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 743 if (IS_ERR(inode)) { 744 err = PTR_ERR(inode); 745 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", 746 err); 747 goto error; 748 } 749 err = v9fs_fid_add(dentry, fid); 750 if (err < 0) 751 goto error; 752 d_instantiate(dentry, inode); 753 fid = NULL; 754 } else { 755 /* Not in cached mode. No need to populate inode with stat */ 756 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0); 757 if (IS_ERR(inode)) { 758 err = PTR_ERR(inode); 759 goto error; 760 } 761 d_instantiate(dentry, inode); 762 } 763 764 error: 765 if (fid) 766 p9_client_clunk(fid); 767 768 return err; 769 } 770 771 /** 772 * v9fs_vfs_link_dotl - create a hardlink for dotl 773 * @old_dentry: dentry for file to link to 774 * @dir: inode destination for new link 775 * @dentry: dentry for link 776 * 777 */ 778 779 static int 780 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir, 781 struct dentry *dentry) 782 { 783 int err; 784 char *name; 785 struct dentry *dir_dentry; 786 struct p9_fid *dfid, *oldfid; 787 struct v9fs_session_info *v9ses; 788 789 p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %s, new_name: %s\n", 790 dir->i_ino, old_dentry->d_name.name, dentry->d_name.name); 791 792 v9ses = v9fs_inode2v9ses(dir); 793 dir_dentry = dentry->d_parent; 794 dfid = v9fs_fid_lookup(dir_dentry); 795 if (IS_ERR(dfid)) 796 return PTR_ERR(dfid); 797 798 oldfid = v9fs_fid_lookup(old_dentry); 799 if (IS_ERR(oldfid)) 800 return PTR_ERR(oldfid); 801 802 name = (char *) dentry->d_name.name; 803 804 err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name); 805 806 if (err < 0) { 807 p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err); 808 return err; 809 } 810 811 v9fs_invalidate_inode_attr(dir); 812 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 813 /* Get the latest stat info from server. */ 814 struct p9_fid *fid; 815 fid = v9fs_fid_lookup(old_dentry); 816 if (IS_ERR(fid)) 817 return PTR_ERR(fid); 818 819 v9fs_refresh_inode_dotl(fid, old_dentry->d_inode); 820 } 821 ihold(old_dentry->d_inode); 822 d_instantiate(dentry, old_dentry->d_inode); 823 824 return err; 825 } 826 827 /** 828 * v9fs_vfs_mknod_dotl - create a special file 829 * @dir: inode destination for new link 830 * @dentry: dentry for file 831 * @mode: mode for creation 832 * @rdev: device associated with special file 833 * 834 */ 835 static int 836 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode, 837 dev_t rdev) 838 { 839 int err; 840 gid_t gid; 841 char *name; 842 umode_t mode; 843 struct v9fs_session_info *v9ses; 844 struct p9_fid *fid = NULL, *dfid = NULL; 845 struct inode *inode; 846 struct p9_qid qid; 847 struct dentry *dir_dentry; 848 struct posix_acl *dacl = NULL, *pacl = NULL; 849 850 p9_debug(P9_DEBUG_VFS, " %lu,%s mode: %hx MAJOR: %u MINOR: %u\n", 851 dir->i_ino, dentry->d_name.name, omode, 852 MAJOR(rdev), MINOR(rdev)); 853 854 if (!new_valid_dev(rdev)) 855 return -EINVAL; 856 857 v9ses = v9fs_inode2v9ses(dir); 858 dir_dentry = dentry->d_parent; 859 dfid = v9fs_fid_lookup(dir_dentry); 860 if (IS_ERR(dfid)) { 861 err = PTR_ERR(dfid); 862 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 863 dfid = NULL; 864 goto error; 865 } 866 867 gid = v9fs_get_fsgid_for_create(dir); 868 mode = omode; 869 /* Update mode based on ACL value */ 870 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); 871 if (err) { 872 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n", 873 err); 874 goto error; 875 } 876 name = (char *) dentry->d_name.name; 877 878 err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid); 879 if (err < 0) 880 goto error; 881 882 v9fs_invalidate_inode_attr(dir); 883 /* instantiate inode and assign the unopened fid to the dentry */ 884 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 885 fid = p9_client_walk(dfid, 1, &name, 1); 886 if (IS_ERR(fid)) { 887 err = PTR_ERR(fid); 888 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", 889 err); 890 fid = NULL; 891 goto error; 892 } 893 894 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 895 if (IS_ERR(inode)) { 896 err = PTR_ERR(inode); 897 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", 898 err); 899 goto error; 900 } 901 err = v9fs_fid_add(dentry, fid); 902 if (err < 0) 903 goto error; 904 d_instantiate(dentry, inode); 905 fid = NULL; 906 } else { 907 /* 908 * Not in cached mode. No need to populate inode with stat. 909 * socket syscall returns a fd, so we need instantiate 910 */ 911 inode = v9fs_get_inode(dir->i_sb, mode, rdev); 912 if (IS_ERR(inode)) { 913 err = PTR_ERR(inode); 914 goto error; 915 } 916 d_instantiate(dentry, inode); 917 } 918 /* Now set the ACL based on the default value */ 919 v9fs_set_create_acl(dentry, &dacl, &pacl); 920 error: 921 if (fid) 922 p9_client_clunk(fid); 923 v9fs_set_create_acl(NULL, &dacl, &pacl); 924 return err; 925 } 926 927 /** 928 * v9fs_vfs_follow_link_dotl - follow a symlink path 929 * @dentry: dentry for symlink 930 * @nd: nameidata 931 * 932 */ 933 934 static void * 935 v9fs_vfs_follow_link_dotl(struct dentry *dentry, struct nameidata *nd) 936 { 937 int retval; 938 struct p9_fid *fid; 939 char *link = __getname(); 940 char *target; 941 942 p9_debug(P9_DEBUG_VFS, "%s\n", dentry->d_name.name); 943 944 if (!link) { 945 link = ERR_PTR(-ENOMEM); 946 goto ndset; 947 } 948 fid = v9fs_fid_lookup(dentry); 949 if (IS_ERR(fid)) { 950 __putname(link); 951 link = ERR_CAST(fid); 952 goto ndset; 953 } 954 retval = p9_client_readlink(fid, &target); 955 if (!retval) { 956 strcpy(link, target); 957 kfree(target); 958 goto ndset; 959 } 960 __putname(link); 961 link = ERR_PTR(retval); 962 ndset: 963 nd_set_link(nd, link); 964 return NULL; 965 } 966 967 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode) 968 { 969 loff_t i_size; 970 struct p9_stat_dotl *st; 971 struct v9fs_session_info *v9ses; 972 973 v9ses = v9fs_inode2v9ses(inode); 974 st = p9_client_getattr_dotl(fid, P9_STATS_ALL); 975 if (IS_ERR(st)) 976 return PTR_ERR(st); 977 /* 978 * Don't update inode if the file type is different 979 */ 980 if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT)) 981 goto out; 982 983 spin_lock(&inode->i_lock); 984 /* 985 * We don't want to refresh inode->i_size, 986 * because we may have cached data 987 */ 988 i_size = inode->i_size; 989 v9fs_stat2inode_dotl(st, inode); 990 if (v9ses->cache) 991 inode->i_size = i_size; 992 spin_unlock(&inode->i_lock); 993 out: 994 kfree(st); 995 return 0; 996 } 997 998 const struct inode_operations v9fs_dir_inode_operations_dotl = { 999 .create = v9fs_vfs_create_dotl, 1000 .atomic_open = v9fs_vfs_atomic_open_dotl, 1001 .lookup = v9fs_vfs_lookup, 1002 .link = v9fs_vfs_link_dotl, 1003 .symlink = v9fs_vfs_symlink_dotl, 1004 .unlink = v9fs_vfs_unlink, 1005 .mkdir = v9fs_vfs_mkdir_dotl, 1006 .rmdir = v9fs_vfs_rmdir, 1007 .mknod = v9fs_vfs_mknod_dotl, 1008 .rename = v9fs_vfs_rename, 1009 .getattr = v9fs_vfs_getattr_dotl, 1010 .setattr = v9fs_vfs_setattr_dotl, 1011 .setxattr = generic_setxattr, 1012 .getxattr = generic_getxattr, 1013 .removexattr = generic_removexattr, 1014 .listxattr = v9fs_listxattr, 1015 .get_acl = v9fs_iop_get_acl, 1016 }; 1017 1018 const struct inode_operations v9fs_file_inode_operations_dotl = { 1019 .getattr = v9fs_vfs_getattr_dotl, 1020 .setattr = v9fs_vfs_setattr_dotl, 1021 .setxattr = generic_setxattr, 1022 .getxattr = generic_getxattr, 1023 .removexattr = generic_removexattr, 1024 .listxattr = v9fs_listxattr, 1025 .get_acl = v9fs_iop_get_acl, 1026 }; 1027 1028 const struct inode_operations v9fs_symlink_inode_operations_dotl = { 1029 .readlink = generic_readlink, 1030 .follow_link = v9fs_vfs_follow_link_dotl, 1031 .put_link = v9fs_vfs_put_link, 1032 .getattr = v9fs_vfs_getattr_dotl, 1033 .setattr = v9fs_vfs_setattr_dotl, 1034 .setxattr = generic_setxattr, 1035 .getxattr = generic_getxattr, 1036 .removexattr = generic_removexattr, 1037 .listxattr = v9fs_listxattr, 1038 }; 1039