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_TRUNC, P9_DOTL_TRUNC }, 190 { O_APPEND, P9_DOTL_APPEND }, 191 { O_NONBLOCK, P9_DOTL_NONBLOCK }, 192 { O_DSYNC, P9_DOTL_DSYNC }, 193 { FASYNC, P9_DOTL_FASYNC }, 194 { O_DIRECT, P9_DOTL_DIRECT }, 195 { O_LARGEFILE, P9_DOTL_LARGEFILE }, 196 { O_DIRECTORY, P9_DOTL_DIRECTORY }, 197 { O_NOFOLLOW, P9_DOTL_NOFOLLOW }, 198 { O_NOATIME, P9_DOTL_NOATIME }, 199 { O_CLOEXEC, P9_DOTL_CLOEXEC }, 200 { O_SYNC, P9_DOTL_SYNC}, 201 }; 202 for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) { 203 if (flags & dotl_oflag_map[i].open_flag) 204 rflags |= dotl_oflag_map[i].dotl_flag; 205 } 206 return rflags; 207 } 208 209 /** 210 * v9fs_open_to_dotl_flags- convert Linux specific open flags to 211 * plan 9 open flag. 212 * @flags: flags to convert 213 */ 214 int v9fs_open_to_dotl_flags(int flags) 215 { 216 int rflags = 0; 217 218 /* 219 * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY 220 * and P9_DOTL_NOACCESS 221 */ 222 rflags |= flags & O_ACCMODE; 223 rflags |= v9fs_mapped_dotl_flags(flags); 224 225 return rflags; 226 } 227 228 /** 229 * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol. 230 * @dir: directory inode that is being created 231 * @dentry: dentry that is being deleted 232 * @mode: create permissions 233 * 234 */ 235 236 static int 237 v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, umode_t omode, 238 bool excl) 239 { 240 return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0); 241 } 242 243 static int 244 v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry, 245 struct file *file, unsigned flags, umode_t omode, 246 int *opened) 247 { 248 int err = 0; 249 gid_t gid; 250 umode_t mode; 251 char *name = NULL; 252 struct p9_qid qid; 253 struct inode *inode; 254 struct p9_fid *fid = NULL; 255 struct v9fs_inode *v9inode; 256 struct p9_fid *dfid, *ofid, *inode_fid; 257 struct v9fs_session_info *v9ses; 258 struct posix_acl *pacl = NULL, *dacl = NULL; 259 struct dentry *res = NULL; 260 261 if (d_unhashed(dentry)) { 262 res = v9fs_vfs_lookup(dir, dentry, 0); 263 if (IS_ERR(res)) 264 return PTR_ERR(res); 265 266 if (res) 267 dentry = res; 268 } 269 270 /* Only creates */ 271 if (!(flags & O_CREAT) || dentry->d_inode) 272 return finish_no_open(file, res); 273 274 v9ses = v9fs_inode2v9ses(dir); 275 276 name = (char *) dentry->d_name.name; 277 p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%hx\n", 278 name, flags, omode); 279 280 dfid = v9fs_fid_lookup(dentry->d_parent); 281 if (IS_ERR(dfid)) { 282 err = PTR_ERR(dfid); 283 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 284 goto out; 285 } 286 287 /* clone a fid to use for creation */ 288 ofid = p9_client_walk(dfid, 0, NULL, 1); 289 if (IS_ERR(ofid)) { 290 err = PTR_ERR(ofid); 291 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 292 goto out; 293 } 294 295 gid = v9fs_get_fsgid_for_create(dir); 296 297 mode = omode; 298 /* Update mode based on ACL value */ 299 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); 300 if (err) { 301 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in creat %d\n", 302 err); 303 goto error; 304 } 305 err = p9_client_create_dotl(ofid, name, v9fs_open_to_dotl_flags(flags), 306 mode, gid, &qid); 307 if (err < 0) { 308 p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in creat %d\n", 309 err); 310 goto error; 311 } 312 v9fs_invalidate_inode_attr(dir); 313 314 /* instantiate inode and assign the unopened fid to the dentry */ 315 fid = p9_client_walk(dfid, 1, &name, 1); 316 if (IS_ERR(fid)) { 317 err = PTR_ERR(fid); 318 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 319 fid = NULL; 320 goto error; 321 } 322 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 323 if (IS_ERR(inode)) { 324 err = PTR_ERR(inode); 325 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err); 326 goto error; 327 } 328 err = v9fs_fid_add(dentry, fid); 329 if (err < 0) 330 goto error; 331 d_instantiate(dentry, inode); 332 333 /* Now set the ACL based on the default value */ 334 v9fs_set_create_acl(dentry, &dacl, &pacl); 335 336 v9inode = V9FS_I(inode); 337 mutex_lock(&v9inode->v_mutex); 338 if (v9ses->cache && !v9inode->writeback_fid && 339 ((flags & O_ACCMODE) != O_RDONLY)) { 340 /* 341 * clone a fid and add it to writeback_fid 342 * we do it during open time instead of 343 * page dirty time via write_begin/page_mkwrite 344 * because we want write after unlink usecase 345 * to work. 346 */ 347 inode_fid = v9fs_writeback_fid(dentry); 348 if (IS_ERR(inode_fid)) { 349 err = PTR_ERR(inode_fid); 350 mutex_unlock(&v9inode->v_mutex); 351 goto err_clunk_old_fid; 352 } 353 v9inode->writeback_fid = (void *) inode_fid; 354 } 355 mutex_unlock(&v9inode->v_mutex); 356 /* Since we are opening a file, assign the open fid to the file */ 357 err = finish_open(file, dentry, generic_file_open, opened); 358 if (err) 359 goto err_clunk_old_fid; 360 file->private_data = ofid; 361 #ifdef CONFIG_9P_FSCACHE 362 if (v9ses->cache) 363 v9fs_cache_inode_set_cookie(inode, file); 364 #endif 365 *opened |= FILE_CREATED; 366 out: 367 dput(res); 368 return err; 369 370 error: 371 if (fid) 372 p9_client_clunk(fid); 373 err_clunk_old_fid: 374 if (ofid) 375 p9_client_clunk(ofid); 376 v9fs_set_create_acl(NULL, &dacl, &pacl); 377 goto out; 378 } 379 380 /** 381 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory 382 * @dir: inode that is being unlinked 383 * @dentry: dentry that is being unlinked 384 * @mode: mode for new directory 385 * 386 */ 387 388 static int v9fs_vfs_mkdir_dotl(struct inode *dir, 389 struct dentry *dentry, umode_t omode) 390 { 391 int err; 392 struct v9fs_session_info *v9ses; 393 struct p9_fid *fid = NULL, *dfid = NULL; 394 gid_t gid; 395 char *name; 396 umode_t mode; 397 struct inode *inode; 398 struct p9_qid qid; 399 struct dentry *dir_dentry; 400 struct posix_acl *dacl = NULL, *pacl = NULL; 401 402 p9_debug(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); 403 err = 0; 404 v9ses = v9fs_inode2v9ses(dir); 405 406 omode |= S_IFDIR; 407 if (dir->i_mode & S_ISGID) 408 omode |= S_ISGID; 409 410 dir_dentry = dentry->d_parent; 411 dfid = v9fs_fid_lookup(dir_dentry); 412 if (IS_ERR(dfid)) { 413 err = PTR_ERR(dfid); 414 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 415 dfid = NULL; 416 goto error; 417 } 418 419 gid = v9fs_get_fsgid_for_create(dir); 420 mode = omode; 421 /* Update mode based on ACL value */ 422 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); 423 if (err) { 424 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n", 425 err); 426 goto error; 427 } 428 name = (char *) dentry->d_name.name; 429 err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid); 430 if (err < 0) 431 goto error; 432 433 /* instantiate inode and assign the unopened fid to the dentry */ 434 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 435 fid = p9_client_walk(dfid, 1, &name, 1); 436 if (IS_ERR(fid)) { 437 err = PTR_ERR(fid); 438 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", 439 err); 440 fid = NULL; 441 goto error; 442 } 443 444 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 445 if (IS_ERR(inode)) { 446 err = PTR_ERR(inode); 447 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", 448 err); 449 goto error; 450 } 451 err = v9fs_fid_add(dentry, fid); 452 if (err < 0) 453 goto error; 454 d_instantiate(dentry, inode); 455 fid = NULL; 456 } else { 457 /* 458 * Not in cached mode. No need to populate 459 * inode with stat. We need to get an inode 460 * so that we can set the acl with dentry 461 */ 462 inode = v9fs_get_inode(dir->i_sb, mode, 0); 463 if (IS_ERR(inode)) { 464 err = PTR_ERR(inode); 465 goto error; 466 } 467 d_instantiate(dentry, inode); 468 } 469 /* Now set the ACL based on the default value */ 470 v9fs_set_create_acl(dentry, &dacl, &pacl); 471 inc_nlink(dir); 472 v9fs_invalidate_inode_attr(dir); 473 error: 474 if (fid) 475 p9_client_clunk(fid); 476 v9fs_set_create_acl(NULL, &dacl, &pacl); 477 return err; 478 } 479 480 static int 481 v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry, 482 struct kstat *stat) 483 { 484 int err; 485 struct v9fs_session_info *v9ses; 486 struct p9_fid *fid; 487 struct p9_stat_dotl *st; 488 489 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry); 490 err = -EPERM; 491 v9ses = v9fs_dentry2v9ses(dentry); 492 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 493 generic_fillattr(dentry->d_inode, stat); 494 return 0; 495 } 496 fid = v9fs_fid_lookup(dentry); 497 if (IS_ERR(fid)) 498 return PTR_ERR(fid); 499 500 /* Ask for all the fields in stat structure. Server will return 501 * whatever it supports 502 */ 503 504 st = p9_client_getattr_dotl(fid, P9_STATS_ALL); 505 if (IS_ERR(st)) 506 return PTR_ERR(st); 507 508 v9fs_stat2inode_dotl(st, dentry->d_inode); 509 generic_fillattr(dentry->d_inode, stat); 510 /* Change block size to what the server returned */ 511 stat->blksize = st->st_blksize; 512 513 kfree(st); 514 return 0; 515 } 516 517 /* 518 * Attribute flags. 519 */ 520 #define P9_ATTR_MODE (1 << 0) 521 #define P9_ATTR_UID (1 << 1) 522 #define P9_ATTR_GID (1 << 2) 523 #define P9_ATTR_SIZE (1 << 3) 524 #define P9_ATTR_ATIME (1 << 4) 525 #define P9_ATTR_MTIME (1 << 5) 526 #define P9_ATTR_CTIME (1 << 6) 527 #define P9_ATTR_ATIME_SET (1 << 7) 528 #define P9_ATTR_MTIME_SET (1 << 8) 529 530 struct dotl_iattr_map { 531 int iattr_valid; 532 int p9_iattr_valid; 533 }; 534 535 static int v9fs_mapped_iattr_valid(int iattr_valid) 536 { 537 int i; 538 int p9_iattr_valid = 0; 539 struct dotl_iattr_map dotl_iattr_map[] = { 540 { ATTR_MODE, P9_ATTR_MODE }, 541 { ATTR_UID, P9_ATTR_UID }, 542 { ATTR_GID, P9_ATTR_GID }, 543 { ATTR_SIZE, P9_ATTR_SIZE }, 544 { ATTR_ATIME, P9_ATTR_ATIME }, 545 { ATTR_MTIME, P9_ATTR_MTIME }, 546 { ATTR_CTIME, P9_ATTR_CTIME }, 547 { ATTR_ATIME_SET, P9_ATTR_ATIME_SET }, 548 { ATTR_MTIME_SET, P9_ATTR_MTIME_SET }, 549 }; 550 for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) { 551 if (iattr_valid & dotl_iattr_map[i].iattr_valid) 552 p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid; 553 } 554 return p9_iattr_valid; 555 } 556 557 /** 558 * v9fs_vfs_setattr_dotl - set file metadata 559 * @dentry: file whose metadata to set 560 * @iattr: metadata assignment structure 561 * 562 */ 563 564 int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr) 565 { 566 int retval; 567 struct v9fs_session_info *v9ses; 568 struct p9_fid *fid; 569 struct p9_iattr_dotl p9attr; 570 571 p9_debug(P9_DEBUG_VFS, "\n"); 572 573 retval = inode_change_ok(dentry->d_inode, iattr); 574 if (retval) 575 return retval; 576 577 p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid); 578 p9attr.mode = iattr->ia_mode; 579 p9attr.uid = iattr->ia_uid; 580 p9attr.gid = iattr->ia_gid; 581 p9attr.size = iattr->ia_size; 582 p9attr.atime_sec = iattr->ia_atime.tv_sec; 583 p9attr.atime_nsec = iattr->ia_atime.tv_nsec; 584 p9attr.mtime_sec = iattr->ia_mtime.tv_sec; 585 p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec; 586 587 retval = -EPERM; 588 v9ses = v9fs_dentry2v9ses(dentry); 589 fid = v9fs_fid_lookup(dentry); 590 if (IS_ERR(fid)) 591 return PTR_ERR(fid); 592 593 /* Write all dirty data */ 594 if (S_ISREG(dentry->d_inode->i_mode)) 595 filemap_write_and_wait(dentry->d_inode->i_mapping); 596 597 retval = p9_client_setattr(fid, &p9attr); 598 if (retval < 0) 599 return retval; 600 601 if ((iattr->ia_valid & ATTR_SIZE) && 602 iattr->ia_size != i_size_read(dentry->d_inode)) 603 truncate_setsize(dentry->d_inode, iattr->ia_size); 604 605 v9fs_invalidate_inode_attr(dentry->d_inode); 606 setattr_copy(dentry->d_inode, iattr); 607 mark_inode_dirty(dentry->d_inode); 608 if (iattr->ia_valid & ATTR_MODE) { 609 /* We also want to update ACL when we update mode bits */ 610 retval = v9fs_acl_chmod(dentry); 611 if (retval < 0) 612 return retval; 613 } 614 return 0; 615 } 616 617 /** 618 * v9fs_stat2inode_dotl - populate an inode structure with stat info 619 * @stat: stat structure 620 * @inode: inode to populate 621 * @sb: superblock of filesystem 622 * 623 */ 624 625 void 626 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode) 627 { 628 umode_t mode; 629 struct v9fs_inode *v9inode = V9FS_I(inode); 630 631 if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) { 632 inode->i_atime.tv_sec = stat->st_atime_sec; 633 inode->i_atime.tv_nsec = stat->st_atime_nsec; 634 inode->i_mtime.tv_sec = stat->st_mtime_sec; 635 inode->i_mtime.tv_nsec = stat->st_mtime_nsec; 636 inode->i_ctime.tv_sec = stat->st_ctime_sec; 637 inode->i_ctime.tv_nsec = stat->st_ctime_nsec; 638 inode->i_uid = stat->st_uid; 639 inode->i_gid = stat->st_gid; 640 set_nlink(inode, stat->st_nlink); 641 642 mode = stat->st_mode & S_IALLUGO; 643 mode |= inode->i_mode & ~S_IALLUGO; 644 inode->i_mode = mode; 645 646 i_size_write(inode, stat->st_size); 647 inode->i_blocks = stat->st_blocks; 648 } else { 649 if (stat->st_result_mask & P9_STATS_ATIME) { 650 inode->i_atime.tv_sec = stat->st_atime_sec; 651 inode->i_atime.tv_nsec = stat->st_atime_nsec; 652 } 653 if (stat->st_result_mask & P9_STATS_MTIME) { 654 inode->i_mtime.tv_sec = stat->st_mtime_sec; 655 inode->i_mtime.tv_nsec = stat->st_mtime_nsec; 656 } 657 if (stat->st_result_mask & P9_STATS_CTIME) { 658 inode->i_ctime.tv_sec = stat->st_ctime_sec; 659 inode->i_ctime.tv_nsec = stat->st_ctime_nsec; 660 } 661 if (stat->st_result_mask & P9_STATS_UID) 662 inode->i_uid = stat->st_uid; 663 if (stat->st_result_mask & P9_STATS_GID) 664 inode->i_gid = stat->st_gid; 665 if (stat->st_result_mask & P9_STATS_NLINK) 666 set_nlink(inode, stat->st_nlink); 667 if (stat->st_result_mask & P9_STATS_MODE) { 668 inode->i_mode = stat->st_mode; 669 if ((S_ISBLK(inode->i_mode)) || 670 (S_ISCHR(inode->i_mode))) 671 init_special_inode(inode, inode->i_mode, 672 inode->i_rdev); 673 } 674 if (stat->st_result_mask & P9_STATS_RDEV) 675 inode->i_rdev = new_decode_dev(stat->st_rdev); 676 if (stat->st_result_mask & P9_STATS_SIZE) 677 i_size_write(inode, stat->st_size); 678 if (stat->st_result_mask & P9_STATS_BLOCKS) 679 inode->i_blocks = stat->st_blocks; 680 } 681 if (stat->st_result_mask & P9_STATS_GEN) 682 inode->i_generation = stat->st_gen; 683 684 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION 685 * because the inode structure does not have fields for them. 686 */ 687 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR; 688 } 689 690 static int 691 v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry, 692 const char *symname) 693 { 694 int err; 695 gid_t gid; 696 char *name; 697 struct p9_qid qid; 698 struct inode *inode; 699 struct p9_fid *dfid; 700 struct p9_fid *fid = NULL; 701 struct v9fs_session_info *v9ses; 702 703 name = (char *) dentry->d_name.name; 704 p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname); 705 v9ses = v9fs_inode2v9ses(dir); 706 707 dfid = v9fs_fid_lookup(dentry->d_parent); 708 if (IS_ERR(dfid)) { 709 err = PTR_ERR(dfid); 710 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 711 return err; 712 } 713 714 gid = v9fs_get_fsgid_for_create(dir); 715 716 /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */ 717 err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid); 718 719 if (err < 0) { 720 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err); 721 goto error; 722 } 723 724 v9fs_invalidate_inode_attr(dir); 725 if (v9ses->cache) { 726 /* Now walk from the parent so we can get an unopened fid. */ 727 fid = p9_client_walk(dfid, 1, &name, 1); 728 if (IS_ERR(fid)) { 729 err = PTR_ERR(fid); 730 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", 731 err); 732 fid = NULL; 733 goto error; 734 } 735 736 /* instantiate inode and assign the unopened fid to dentry */ 737 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 738 if (IS_ERR(inode)) { 739 err = PTR_ERR(inode); 740 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", 741 err); 742 goto error; 743 } 744 err = v9fs_fid_add(dentry, fid); 745 if (err < 0) 746 goto error; 747 d_instantiate(dentry, inode); 748 fid = NULL; 749 } else { 750 /* Not in cached mode. No need to populate inode with stat */ 751 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0); 752 if (IS_ERR(inode)) { 753 err = PTR_ERR(inode); 754 goto error; 755 } 756 d_instantiate(dentry, inode); 757 } 758 759 error: 760 if (fid) 761 p9_client_clunk(fid); 762 763 return err; 764 } 765 766 /** 767 * v9fs_vfs_link_dotl - create a hardlink for dotl 768 * @old_dentry: dentry for file to link to 769 * @dir: inode destination for new link 770 * @dentry: dentry for link 771 * 772 */ 773 774 static int 775 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir, 776 struct dentry *dentry) 777 { 778 int err; 779 char *name; 780 struct dentry *dir_dentry; 781 struct p9_fid *dfid, *oldfid; 782 struct v9fs_session_info *v9ses; 783 784 p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %s, new_name: %s\n", 785 dir->i_ino, old_dentry->d_name.name, dentry->d_name.name); 786 787 v9ses = v9fs_inode2v9ses(dir); 788 dir_dentry = dentry->d_parent; 789 dfid = v9fs_fid_lookup(dir_dentry); 790 if (IS_ERR(dfid)) 791 return PTR_ERR(dfid); 792 793 oldfid = v9fs_fid_lookup(old_dentry); 794 if (IS_ERR(oldfid)) 795 return PTR_ERR(oldfid); 796 797 name = (char *) dentry->d_name.name; 798 799 err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name); 800 801 if (err < 0) { 802 p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err); 803 return err; 804 } 805 806 v9fs_invalidate_inode_attr(dir); 807 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 808 /* Get the latest stat info from server. */ 809 struct p9_fid *fid; 810 fid = v9fs_fid_lookup(old_dentry); 811 if (IS_ERR(fid)) 812 return PTR_ERR(fid); 813 814 v9fs_refresh_inode_dotl(fid, old_dentry->d_inode); 815 } 816 ihold(old_dentry->d_inode); 817 d_instantiate(dentry, old_dentry->d_inode); 818 819 return err; 820 } 821 822 /** 823 * v9fs_vfs_mknod_dotl - create a special file 824 * @dir: inode destination for new link 825 * @dentry: dentry for file 826 * @mode: mode for creation 827 * @rdev: device associated with special file 828 * 829 */ 830 static int 831 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode, 832 dev_t rdev) 833 { 834 int err; 835 gid_t gid; 836 char *name; 837 umode_t mode; 838 struct v9fs_session_info *v9ses; 839 struct p9_fid *fid = NULL, *dfid = NULL; 840 struct inode *inode; 841 struct p9_qid qid; 842 struct dentry *dir_dentry; 843 struct posix_acl *dacl = NULL, *pacl = NULL; 844 845 p9_debug(P9_DEBUG_VFS, " %lu,%s mode: %hx MAJOR: %u MINOR: %u\n", 846 dir->i_ino, dentry->d_name.name, omode, 847 MAJOR(rdev), MINOR(rdev)); 848 849 if (!new_valid_dev(rdev)) 850 return -EINVAL; 851 852 v9ses = v9fs_inode2v9ses(dir); 853 dir_dentry = dentry->d_parent; 854 dfid = v9fs_fid_lookup(dir_dentry); 855 if (IS_ERR(dfid)) { 856 err = PTR_ERR(dfid); 857 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 858 dfid = NULL; 859 goto error; 860 } 861 862 gid = v9fs_get_fsgid_for_create(dir); 863 mode = omode; 864 /* Update mode based on ACL value */ 865 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); 866 if (err) { 867 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n", 868 err); 869 goto error; 870 } 871 name = (char *) dentry->d_name.name; 872 873 err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid); 874 if (err < 0) 875 goto error; 876 877 v9fs_invalidate_inode_attr(dir); 878 /* instantiate inode and assign the unopened fid to the dentry */ 879 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 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 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 890 if (IS_ERR(inode)) { 891 err = PTR_ERR(inode); 892 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", 893 err); 894 goto error; 895 } 896 err = v9fs_fid_add(dentry, fid); 897 if (err < 0) 898 goto error; 899 d_instantiate(dentry, inode); 900 fid = NULL; 901 } else { 902 /* 903 * Not in cached mode. No need to populate inode with stat. 904 * socket syscall returns a fd, so we need instantiate 905 */ 906 inode = v9fs_get_inode(dir->i_sb, mode, rdev); 907 if (IS_ERR(inode)) { 908 err = PTR_ERR(inode); 909 goto error; 910 } 911 d_instantiate(dentry, inode); 912 } 913 /* Now set the ACL based on the default value */ 914 v9fs_set_create_acl(dentry, &dacl, &pacl); 915 error: 916 if (fid) 917 p9_client_clunk(fid); 918 v9fs_set_create_acl(NULL, &dacl, &pacl); 919 return err; 920 } 921 922 /** 923 * v9fs_vfs_follow_link_dotl - follow a symlink path 924 * @dentry: dentry for symlink 925 * @nd: nameidata 926 * 927 */ 928 929 static void * 930 v9fs_vfs_follow_link_dotl(struct dentry *dentry, struct nameidata *nd) 931 { 932 int retval; 933 struct p9_fid *fid; 934 char *link = __getname(); 935 char *target; 936 937 p9_debug(P9_DEBUG_VFS, "%s\n", dentry->d_name.name); 938 939 if (!link) { 940 link = ERR_PTR(-ENOMEM); 941 goto ndset; 942 } 943 fid = v9fs_fid_lookup(dentry); 944 if (IS_ERR(fid)) { 945 __putname(link); 946 link = ERR_CAST(fid); 947 goto ndset; 948 } 949 retval = p9_client_readlink(fid, &target); 950 if (!retval) { 951 strcpy(link, target); 952 kfree(target); 953 goto ndset; 954 } 955 __putname(link); 956 link = ERR_PTR(retval); 957 ndset: 958 nd_set_link(nd, link); 959 return NULL; 960 } 961 962 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode) 963 { 964 loff_t i_size; 965 struct p9_stat_dotl *st; 966 struct v9fs_session_info *v9ses; 967 968 v9ses = v9fs_inode2v9ses(inode); 969 st = p9_client_getattr_dotl(fid, P9_STATS_ALL); 970 if (IS_ERR(st)) 971 return PTR_ERR(st); 972 /* 973 * Don't update inode if the file type is different 974 */ 975 if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT)) 976 goto out; 977 978 spin_lock(&inode->i_lock); 979 /* 980 * We don't want to refresh inode->i_size, 981 * because we may have cached data 982 */ 983 i_size = inode->i_size; 984 v9fs_stat2inode_dotl(st, inode); 985 if (v9ses->cache) 986 inode->i_size = i_size; 987 spin_unlock(&inode->i_lock); 988 out: 989 kfree(st); 990 return 0; 991 } 992 993 const struct inode_operations v9fs_dir_inode_operations_dotl = { 994 .create = v9fs_vfs_create_dotl, 995 .atomic_open = v9fs_vfs_atomic_open_dotl, 996 .lookup = v9fs_vfs_lookup, 997 .link = v9fs_vfs_link_dotl, 998 .symlink = v9fs_vfs_symlink_dotl, 999 .unlink = v9fs_vfs_unlink, 1000 .mkdir = v9fs_vfs_mkdir_dotl, 1001 .rmdir = v9fs_vfs_rmdir, 1002 .mknod = v9fs_vfs_mknod_dotl, 1003 .rename = v9fs_vfs_rename, 1004 .getattr = v9fs_vfs_getattr_dotl, 1005 .setattr = v9fs_vfs_setattr_dotl, 1006 .setxattr = generic_setxattr, 1007 .getxattr = generic_getxattr, 1008 .removexattr = generic_removexattr, 1009 .listxattr = v9fs_listxattr, 1010 .get_acl = v9fs_iop_get_acl, 1011 }; 1012 1013 const struct inode_operations v9fs_file_inode_operations_dotl = { 1014 .getattr = v9fs_vfs_getattr_dotl, 1015 .setattr = v9fs_vfs_setattr_dotl, 1016 .setxattr = generic_setxattr, 1017 .getxattr = generic_getxattr, 1018 .removexattr = generic_removexattr, 1019 .listxattr = v9fs_listxattr, 1020 .get_acl = v9fs_iop_get_acl, 1021 }; 1022 1023 const struct inode_operations v9fs_symlink_inode_operations_dotl = { 1024 .readlink = generic_readlink, 1025 .follow_link = v9fs_vfs_follow_link_dotl, 1026 .put_link = v9fs_vfs_put_link, 1027 .getattr = v9fs_vfs_getattr_dotl, 1028 .setattr = v9fs_vfs_setattr_dotl, 1029 .setxattr = generic_setxattr, 1030 .getxattr = generic_getxattr, 1031 .removexattr = generic_removexattr, 1032 .listxattr = v9fs_listxattr, 1033 }; 1034