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 /** 72 * v9fs_dentry_from_dir_inode - helper function to get the dentry from 73 * dir inode. 74 * 75 */ 76 77 static struct dentry *v9fs_dentry_from_dir_inode(struct inode *inode) 78 { 79 struct dentry *dentry; 80 81 spin_lock(&inode->i_lock); 82 /* Directory should have only one entry. */ 83 BUG_ON(S_ISDIR(inode->i_mode) && !list_is_singular(&inode->i_dentry)); 84 dentry = list_entry(inode->i_dentry.next, struct dentry, d_alias); 85 spin_unlock(&inode->i_lock); 86 return dentry; 87 } 88 89 static int v9fs_test_inode_dotl(struct inode *inode, void *data) 90 { 91 struct v9fs_inode *v9inode = V9FS_I(inode); 92 struct p9_stat_dotl *st = (struct p9_stat_dotl *)data; 93 94 /* don't match inode of different type */ 95 if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT)) 96 return 0; 97 98 if (inode->i_generation != st->st_gen) 99 return 0; 100 101 /* compare qid details */ 102 if (memcmp(&v9inode->qid.version, 103 &st->qid.version, sizeof(v9inode->qid.version))) 104 return 0; 105 106 if (v9inode->qid.type != st->qid.type) 107 return 0; 108 return 1; 109 } 110 111 /* Always get a new inode */ 112 static int v9fs_test_new_inode_dotl(struct inode *inode, void *data) 113 { 114 return 0; 115 } 116 117 static int v9fs_set_inode_dotl(struct inode *inode, void *data) 118 { 119 struct v9fs_inode *v9inode = V9FS_I(inode); 120 struct p9_stat_dotl *st = (struct p9_stat_dotl *)data; 121 122 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid)); 123 inode->i_generation = st->st_gen; 124 return 0; 125 } 126 127 static struct inode *v9fs_qid_iget_dotl(struct super_block *sb, 128 struct p9_qid *qid, 129 struct p9_fid *fid, 130 struct p9_stat_dotl *st, 131 int new) 132 { 133 int retval; 134 unsigned long i_ino; 135 struct inode *inode; 136 struct v9fs_session_info *v9ses = sb->s_fs_info; 137 int (*test)(struct inode *, void *); 138 139 if (new) 140 test = v9fs_test_new_inode_dotl; 141 else 142 test = v9fs_test_inode_dotl; 143 144 i_ino = v9fs_qid2ino(qid); 145 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode_dotl, st); 146 if (!inode) 147 return ERR_PTR(-ENOMEM); 148 if (!(inode->i_state & I_NEW)) 149 return inode; 150 /* 151 * initialize the inode with the stat info 152 * FIXME!! we may need support for stale inodes 153 * later. 154 */ 155 inode->i_ino = i_ino; 156 retval = v9fs_init_inode(v9ses, inode, 157 st->st_mode, new_decode_dev(st->st_rdev)); 158 if (retval) 159 goto error; 160 161 v9fs_stat2inode_dotl(st, inode); 162 #ifdef CONFIG_9P_FSCACHE 163 v9fs_cache_inode_get_cookie(inode); 164 #endif 165 retval = v9fs_get_acl(inode, fid); 166 if (retval) 167 goto error; 168 169 unlock_new_inode(inode); 170 return inode; 171 error: 172 unlock_new_inode(inode); 173 iput(inode); 174 return ERR_PTR(retval); 175 176 } 177 178 struct inode * 179 v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid, 180 struct super_block *sb, int new) 181 { 182 struct p9_stat_dotl *st; 183 struct inode *inode = NULL; 184 185 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN); 186 if (IS_ERR(st)) 187 return ERR_CAST(st); 188 189 inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st, new); 190 kfree(st); 191 return inode; 192 } 193 194 struct dotl_openflag_map { 195 int open_flag; 196 int dotl_flag; 197 }; 198 199 static int v9fs_mapped_dotl_flags(int flags) 200 { 201 int i; 202 int rflags = 0; 203 struct dotl_openflag_map dotl_oflag_map[] = { 204 { O_CREAT, P9_DOTL_CREATE }, 205 { O_EXCL, P9_DOTL_EXCL }, 206 { O_NOCTTY, P9_DOTL_NOCTTY }, 207 { O_TRUNC, P9_DOTL_TRUNC }, 208 { O_APPEND, P9_DOTL_APPEND }, 209 { O_NONBLOCK, P9_DOTL_NONBLOCK }, 210 { O_DSYNC, P9_DOTL_DSYNC }, 211 { FASYNC, P9_DOTL_FASYNC }, 212 { O_DIRECT, P9_DOTL_DIRECT }, 213 { O_LARGEFILE, P9_DOTL_LARGEFILE }, 214 { O_DIRECTORY, P9_DOTL_DIRECTORY }, 215 { O_NOFOLLOW, P9_DOTL_NOFOLLOW }, 216 { O_NOATIME, P9_DOTL_NOATIME }, 217 { O_CLOEXEC, P9_DOTL_CLOEXEC }, 218 { O_SYNC, P9_DOTL_SYNC}, 219 }; 220 for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) { 221 if (flags & dotl_oflag_map[i].open_flag) 222 rflags |= dotl_oflag_map[i].dotl_flag; 223 } 224 return rflags; 225 } 226 227 /** 228 * v9fs_open_to_dotl_flags- convert Linux specific open flags to 229 * plan 9 open flag. 230 * @flags: flags to convert 231 */ 232 int v9fs_open_to_dotl_flags(int flags) 233 { 234 int rflags = 0; 235 236 /* 237 * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY 238 * and P9_DOTL_NOACCESS 239 */ 240 rflags |= flags & O_ACCMODE; 241 rflags |= v9fs_mapped_dotl_flags(flags); 242 243 return rflags; 244 } 245 246 /** 247 * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol. 248 * @dir: directory inode that is being created 249 * @dentry: dentry that is being deleted 250 * @mode: create permissions 251 * @nd: path information 252 * 253 */ 254 255 static int 256 v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, umode_t omode, 257 struct nameidata *nd) 258 { 259 int err = 0; 260 gid_t gid; 261 int flags; 262 umode_t mode; 263 char *name = NULL; 264 struct file *filp; 265 struct p9_qid qid; 266 struct inode *inode; 267 struct p9_fid *fid = NULL; 268 struct v9fs_inode *v9inode; 269 struct p9_fid *dfid, *ofid, *inode_fid; 270 struct v9fs_session_info *v9ses; 271 struct posix_acl *pacl = NULL, *dacl = NULL; 272 273 v9ses = v9fs_inode2v9ses(dir); 274 if (nd) 275 flags = nd->intent.open.flags; 276 else { 277 /* 278 * create call without LOOKUP_OPEN is due 279 * to mknod of regular files. So use mknod 280 * operation. 281 */ 282 return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0); 283 } 284 285 name = (char *) dentry->d_name.name; 286 p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%hx\n", 287 name, flags, omode); 288 289 dfid = v9fs_fid_lookup(dentry->d_parent); 290 if (IS_ERR(dfid)) { 291 err = PTR_ERR(dfid); 292 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 293 return err; 294 } 295 296 /* clone a fid to use for creation */ 297 ofid = p9_client_walk(dfid, 0, NULL, 1); 298 if (IS_ERR(ofid)) { 299 err = PTR_ERR(ofid); 300 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 301 return err; 302 } 303 304 gid = v9fs_get_fsgid_for_create(dir); 305 306 mode = omode; 307 /* Update mode based on ACL value */ 308 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); 309 if (err) { 310 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in creat %d\n", 311 err); 312 goto error; 313 } 314 err = p9_client_create_dotl(ofid, name, v9fs_open_to_dotl_flags(flags), 315 mode, gid, &qid); 316 if (err < 0) { 317 p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in creat %d\n", 318 err); 319 goto error; 320 } 321 v9fs_invalidate_inode_attr(dir); 322 323 /* instantiate inode and assign the unopened fid to the dentry */ 324 fid = p9_client_walk(dfid, 1, &name, 1); 325 if (IS_ERR(fid)) { 326 err = PTR_ERR(fid); 327 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 328 fid = NULL; 329 goto error; 330 } 331 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 332 if (IS_ERR(inode)) { 333 err = PTR_ERR(inode); 334 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err); 335 goto error; 336 } 337 err = v9fs_fid_add(dentry, fid); 338 if (err < 0) 339 goto error; 340 d_instantiate(dentry, inode); 341 342 /* Now set the ACL based on the default value */ 343 v9fs_set_create_acl(dentry, &dacl, &pacl); 344 345 v9inode = V9FS_I(inode); 346 mutex_lock(&v9inode->v_mutex); 347 if (v9ses->cache && !v9inode->writeback_fid && 348 ((flags & O_ACCMODE) != O_RDONLY)) { 349 /* 350 * clone a fid and add it to writeback_fid 351 * we do it during open time instead of 352 * page dirty time via write_begin/page_mkwrite 353 * because we want write after unlink usecase 354 * to work. 355 */ 356 inode_fid = v9fs_writeback_fid(dentry); 357 if (IS_ERR(inode_fid)) { 358 err = PTR_ERR(inode_fid); 359 mutex_unlock(&v9inode->v_mutex); 360 goto err_clunk_old_fid; 361 } 362 v9inode->writeback_fid = (void *) inode_fid; 363 } 364 mutex_unlock(&v9inode->v_mutex); 365 /* Since we are opening a file, assign the open fid to the file */ 366 filp = lookup_instantiate_filp(nd, dentry, generic_file_open); 367 if (IS_ERR(filp)) { 368 err = PTR_ERR(filp); 369 goto err_clunk_old_fid; 370 } 371 filp->private_data = ofid; 372 #ifdef CONFIG_9P_FSCACHE 373 if (v9ses->cache) 374 v9fs_cache_inode_set_cookie(inode, filp); 375 #endif 376 return 0; 377 378 error: 379 if (fid) 380 p9_client_clunk(fid); 381 err_clunk_old_fid: 382 if (ofid) 383 p9_client_clunk(ofid); 384 v9fs_set_create_acl(NULL, &dacl, &pacl); 385 return err; 386 } 387 388 /** 389 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory 390 * @dir: inode that is being unlinked 391 * @dentry: dentry that is being unlinked 392 * @mode: mode for new directory 393 * 394 */ 395 396 static int v9fs_vfs_mkdir_dotl(struct inode *dir, 397 struct dentry *dentry, umode_t omode) 398 { 399 int err; 400 struct v9fs_session_info *v9ses; 401 struct p9_fid *fid = NULL, *dfid = NULL; 402 gid_t gid; 403 char *name; 404 umode_t mode; 405 struct inode *inode; 406 struct p9_qid qid; 407 struct dentry *dir_dentry; 408 struct posix_acl *dacl = NULL, *pacl = NULL; 409 410 p9_debug(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); 411 err = 0; 412 v9ses = v9fs_inode2v9ses(dir); 413 414 omode |= S_IFDIR; 415 if (dir->i_mode & S_ISGID) 416 omode |= S_ISGID; 417 418 dir_dentry = v9fs_dentry_from_dir_inode(dir); 419 dfid = v9fs_fid_lookup(dir_dentry); 420 if (IS_ERR(dfid)) { 421 err = PTR_ERR(dfid); 422 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 423 dfid = NULL; 424 goto error; 425 } 426 427 gid = v9fs_get_fsgid_for_create(dir); 428 mode = omode; 429 /* Update mode based on ACL value */ 430 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); 431 if (err) { 432 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n", 433 err); 434 goto error; 435 } 436 name = (char *) dentry->d_name.name; 437 err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid); 438 if (err < 0) 439 goto error; 440 441 /* instantiate inode and assign the unopened fid to the dentry */ 442 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 443 fid = p9_client_walk(dfid, 1, &name, 1); 444 if (IS_ERR(fid)) { 445 err = PTR_ERR(fid); 446 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", 447 err); 448 fid = NULL; 449 goto error; 450 } 451 452 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 453 if (IS_ERR(inode)) { 454 err = PTR_ERR(inode); 455 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", 456 err); 457 goto error; 458 } 459 err = v9fs_fid_add(dentry, fid); 460 if (err < 0) 461 goto error; 462 d_instantiate(dentry, inode); 463 fid = NULL; 464 } else { 465 /* 466 * Not in cached mode. No need to populate 467 * inode with stat. We need to get an inode 468 * so that we can set the acl with dentry 469 */ 470 inode = v9fs_get_inode(dir->i_sb, mode, 0); 471 if (IS_ERR(inode)) { 472 err = PTR_ERR(inode); 473 goto error; 474 } 475 d_instantiate(dentry, inode); 476 } 477 /* Now set the ACL based on the default value */ 478 v9fs_set_create_acl(dentry, &dacl, &pacl); 479 inc_nlink(dir); 480 v9fs_invalidate_inode_attr(dir); 481 error: 482 if (fid) 483 p9_client_clunk(fid); 484 v9fs_set_create_acl(NULL, &dacl, &pacl); 485 return err; 486 } 487 488 static int 489 v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry, 490 struct kstat *stat) 491 { 492 int err; 493 struct v9fs_session_info *v9ses; 494 struct p9_fid *fid; 495 struct p9_stat_dotl *st; 496 497 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry); 498 err = -EPERM; 499 v9ses = v9fs_dentry2v9ses(dentry); 500 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 501 generic_fillattr(dentry->d_inode, stat); 502 return 0; 503 } 504 fid = v9fs_fid_lookup(dentry); 505 if (IS_ERR(fid)) 506 return PTR_ERR(fid); 507 508 /* Ask for all the fields in stat structure. Server will return 509 * whatever it supports 510 */ 511 512 st = p9_client_getattr_dotl(fid, P9_STATS_ALL); 513 if (IS_ERR(st)) 514 return PTR_ERR(st); 515 516 v9fs_stat2inode_dotl(st, dentry->d_inode); 517 generic_fillattr(dentry->d_inode, stat); 518 /* Change block size to what the server returned */ 519 stat->blksize = st->st_blksize; 520 521 kfree(st); 522 return 0; 523 } 524 525 /* 526 * Attribute flags. 527 */ 528 #define P9_ATTR_MODE (1 << 0) 529 #define P9_ATTR_UID (1 << 1) 530 #define P9_ATTR_GID (1 << 2) 531 #define P9_ATTR_SIZE (1 << 3) 532 #define P9_ATTR_ATIME (1 << 4) 533 #define P9_ATTR_MTIME (1 << 5) 534 #define P9_ATTR_CTIME (1 << 6) 535 #define P9_ATTR_ATIME_SET (1 << 7) 536 #define P9_ATTR_MTIME_SET (1 << 8) 537 538 struct dotl_iattr_map { 539 int iattr_valid; 540 int p9_iattr_valid; 541 }; 542 543 static int v9fs_mapped_iattr_valid(int iattr_valid) 544 { 545 int i; 546 int p9_iattr_valid = 0; 547 struct dotl_iattr_map dotl_iattr_map[] = { 548 { ATTR_MODE, P9_ATTR_MODE }, 549 { ATTR_UID, P9_ATTR_UID }, 550 { ATTR_GID, P9_ATTR_GID }, 551 { ATTR_SIZE, P9_ATTR_SIZE }, 552 { ATTR_ATIME, P9_ATTR_ATIME }, 553 { ATTR_MTIME, P9_ATTR_MTIME }, 554 { ATTR_CTIME, P9_ATTR_CTIME }, 555 { ATTR_ATIME_SET, P9_ATTR_ATIME_SET }, 556 { ATTR_MTIME_SET, P9_ATTR_MTIME_SET }, 557 }; 558 for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) { 559 if (iattr_valid & dotl_iattr_map[i].iattr_valid) 560 p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid; 561 } 562 return p9_iattr_valid; 563 } 564 565 /** 566 * v9fs_vfs_setattr_dotl - set file metadata 567 * @dentry: file whose metadata to set 568 * @iattr: metadata assignment structure 569 * 570 */ 571 572 int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr) 573 { 574 int retval; 575 struct v9fs_session_info *v9ses; 576 struct p9_fid *fid; 577 struct p9_iattr_dotl p9attr; 578 579 p9_debug(P9_DEBUG_VFS, "\n"); 580 581 retval = inode_change_ok(dentry->d_inode, iattr); 582 if (retval) 583 return retval; 584 585 p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid); 586 p9attr.mode = iattr->ia_mode; 587 p9attr.uid = iattr->ia_uid; 588 p9attr.gid = iattr->ia_gid; 589 p9attr.size = iattr->ia_size; 590 p9attr.atime_sec = iattr->ia_atime.tv_sec; 591 p9attr.atime_nsec = iattr->ia_atime.tv_nsec; 592 p9attr.mtime_sec = iattr->ia_mtime.tv_sec; 593 p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec; 594 595 retval = -EPERM; 596 v9ses = v9fs_dentry2v9ses(dentry); 597 fid = v9fs_fid_lookup(dentry); 598 if (IS_ERR(fid)) 599 return PTR_ERR(fid); 600 601 /* Write all dirty data */ 602 if (S_ISREG(dentry->d_inode->i_mode)) 603 filemap_write_and_wait(dentry->d_inode->i_mapping); 604 605 retval = p9_client_setattr(fid, &p9attr); 606 if (retval < 0) 607 return retval; 608 609 if ((iattr->ia_valid & ATTR_SIZE) && 610 iattr->ia_size != i_size_read(dentry->d_inode)) 611 truncate_setsize(dentry->d_inode, iattr->ia_size); 612 613 v9fs_invalidate_inode_attr(dentry->d_inode); 614 setattr_copy(dentry->d_inode, iattr); 615 mark_inode_dirty(dentry->d_inode); 616 if (iattr->ia_valid & ATTR_MODE) { 617 /* We also want to update ACL when we update mode bits */ 618 retval = v9fs_acl_chmod(dentry); 619 if (retval < 0) 620 return retval; 621 } 622 return 0; 623 } 624 625 /** 626 * v9fs_stat2inode_dotl - populate an inode structure with stat info 627 * @stat: stat structure 628 * @inode: inode to populate 629 * @sb: superblock of filesystem 630 * 631 */ 632 633 void 634 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode) 635 { 636 umode_t mode; 637 struct v9fs_inode *v9inode = V9FS_I(inode); 638 639 if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) { 640 inode->i_atime.tv_sec = stat->st_atime_sec; 641 inode->i_atime.tv_nsec = stat->st_atime_nsec; 642 inode->i_mtime.tv_sec = stat->st_mtime_sec; 643 inode->i_mtime.tv_nsec = stat->st_mtime_nsec; 644 inode->i_ctime.tv_sec = stat->st_ctime_sec; 645 inode->i_ctime.tv_nsec = stat->st_ctime_nsec; 646 inode->i_uid = stat->st_uid; 647 inode->i_gid = stat->st_gid; 648 set_nlink(inode, stat->st_nlink); 649 650 mode = stat->st_mode & S_IALLUGO; 651 mode |= inode->i_mode & ~S_IALLUGO; 652 inode->i_mode = mode; 653 654 i_size_write(inode, stat->st_size); 655 inode->i_blocks = stat->st_blocks; 656 } else { 657 if (stat->st_result_mask & P9_STATS_ATIME) { 658 inode->i_atime.tv_sec = stat->st_atime_sec; 659 inode->i_atime.tv_nsec = stat->st_atime_nsec; 660 } 661 if (stat->st_result_mask & P9_STATS_MTIME) { 662 inode->i_mtime.tv_sec = stat->st_mtime_sec; 663 inode->i_mtime.tv_nsec = stat->st_mtime_nsec; 664 } 665 if (stat->st_result_mask & P9_STATS_CTIME) { 666 inode->i_ctime.tv_sec = stat->st_ctime_sec; 667 inode->i_ctime.tv_nsec = stat->st_ctime_nsec; 668 } 669 if (stat->st_result_mask & P9_STATS_UID) 670 inode->i_uid = stat->st_uid; 671 if (stat->st_result_mask & P9_STATS_GID) 672 inode->i_gid = stat->st_gid; 673 if (stat->st_result_mask & P9_STATS_NLINK) 674 set_nlink(inode, stat->st_nlink); 675 if (stat->st_result_mask & P9_STATS_MODE) { 676 inode->i_mode = stat->st_mode; 677 if ((S_ISBLK(inode->i_mode)) || 678 (S_ISCHR(inode->i_mode))) 679 init_special_inode(inode, inode->i_mode, 680 inode->i_rdev); 681 } 682 if (stat->st_result_mask & P9_STATS_RDEV) 683 inode->i_rdev = new_decode_dev(stat->st_rdev); 684 if (stat->st_result_mask & P9_STATS_SIZE) 685 i_size_write(inode, stat->st_size); 686 if (stat->st_result_mask & P9_STATS_BLOCKS) 687 inode->i_blocks = stat->st_blocks; 688 } 689 if (stat->st_result_mask & P9_STATS_GEN) 690 inode->i_generation = stat->st_gen; 691 692 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION 693 * because the inode structure does not have fields for them. 694 */ 695 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR; 696 } 697 698 static int 699 v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry, 700 const char *symname) 701 { 702 int err; 703 gid_t gid; 704 char *name; 705 struct p9_qid qid; 706 struct inode *inode; 707 struct p9_fid *dfid; 708 struct p9_fid *fid = NULL; 709 struct v9fs_session_info *v9ses; 710 711 name = (char *) dentry->d_name.name; 712 p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname); 713 v9ses = v9fs_inode2v9ses(dir); 714 715 dfid = v9fs_fid_lookup(dentry->d_parent); 716 if (IS_ERR(dfid)) { 717 err = PTR_ERR(dfid); 718 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 719 return err; 720 } 721 722 gid = v9fs_get_fsgid_for_create(dir); 723 724 /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */ 725 err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid); 726 727 if (err < 0) { 728 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err); 729 goto error; 730 } 731 732 v9fs_invalidate_inode_attr(dir); 733 if (v9ses->cache) { 734 /* Now walk from the parent so we can get an unopened fid. */ 735 fid = p9_client_walk(dfid, 1, &name, 1); 736 if (IS_ERR(fid)) { 737 err = PTR_ERR(fid); 738 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", 739 err); 740 fid = NULL; 741 goto error; 742 } 743 744 /* instantiate inode and assign the unopened fid to dentry */ 745 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 746 if (IS_ERR(inode)) { 747 err = PTR_ERR(inode); 748 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", 749 err); 750 goto error; 751 } 752 err = v9fs_fid_add(dentry, fid); 753 if (err < 0) 754 goto error; 755 d_instantiate(dentry, inode); 756 fid = NULL; 757 } else { 758 /* Not in cached mode. No need to populate inode with stat */ 759 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0); 760 if (IS_ERR(inode)) { 761 err = PTR_ERR(inode); 762 goto error; 763 } 764 d_instantiate(dentry, inode); 765 } 766 767 error: 768 if (fid) 769 p9_client_clunk(fid); 770 771 return err; 772 } 773 774 /** 775 * v9fs_vfs_link_dotl - create a hardlink for dotl 776 * @old_dentry: dentry for file to link to 777 * @dir: inode destination for new link 778 * @dentry: dentry for link 779 * 780 */ 781 782 static int 783 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir, 784 struct dentry *dentry) 785 { 786 int err; 787 char *name; 788 struct dentry *dir_dentry; 789 struct p9_fid *dfid, *oldfid; 790 struct v9fs_session_info *v9ses; 791 792 p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %s, new_name: %s\n", 793 dir->i_ino, old_dentry->d_name.name, dentry->d_name.name); 794 795 v9ses = v9fs_inode2v9ses(dir); 796 dir_dentry = v9fs_dentry_from_dir_inode(dir); 797 dfid = v9fs_fid_lookup(dir_dentry); 798 if (IS_ERR(dfid)) 799 return PTR_ERR(dfid); 800 801 oldfid = v9fs_fid_lookup(old_dentry); 802 if (IS_ERR(oldfid)) 803 return PTR_ERR(oldfid); 804 805 name = (char *) dentry->d_name.name; 806 807 err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name); 808 809 if (err < 0) { 810 p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err); 811 return err; 812 } 813 814 v9fs_invalidate_inode_attr(dir); 815 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 816 /* Get the latest stat info from server. */ 817 struct p9_fid *fid; 818 fid = v9fs_fid_lookup(old_dentry); 819 if (IS_ERR(fid)) 820 return PTR_ERR(fid); 821 822 v9fs_refresh_inode_dotl(fid, old_dentry->d_inode); 823 } 824 ihold(old_dentry->d_inode); 825 d_instantiate(dentry, old_dentry->d_inode); 826 827 return err; 828 } 829 830 /** 831 * v9fs_vfs_mknod_dotl - create a special file 832 * @dir: inode destination for new link 833 * @dentry: dentry for file 834 * @mode: mode for creation 835 * @rdev: device associated with special file 836 * 837 */ 838 static int 839 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode, 840 dev_t rdev) 841 { 842 int err; 843 gid_t gid; 844 char *name; 845 umode_t mode; 846 struct v9fs_session_info *v9ses; 847 struct p9_fid *fid = NULL, *dfid = NULL; 848 struct inode *inode; 849 struct p9_qid qid; 850 struct dentry *dir_dentry; 851 struct posix_acl *dacl = NULL, *pacl = NULL; 852 853 p9_debug(P9_DEBUG_VFS, " %lu,%s mode: %hx MAJOR: %u MINOR: %u\n", 854 dir->i_ino, dentry->d_name.name, omode, 855 MAJOR(rdev), MINOR(rdev)); 856 857 if (!new_valid_dev(rdev)) 858 return -EINVAL; 859 860 v9ses = v9fs_inode2v9ses(dir); 861 dir_dentry = v9fs_dentry_from_dir_inode(dir); 862 dfid = v9fs_fid_lookup(dir_dentry); 863 if (IS_ERR(dfid)) { 864 err = PTR_ERR(dfid); 865 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 866 dfid = NULL; 867 goto error; 868 } 869 870 gid = v9fs_get_fsgid_for_create(dir); 871 mode = omode; 872 /* Update mode based on ACL value */ 873 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); 874 if (err) { 875 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n", 876 err); 877 goto error; 878 } 879 name = (char *) dentry->d_name.name; 880 881 err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid); 882 if (err < 0) 883 goto error; 884 885 v9fs_invalidate_inode_attr(dir); 886 /* instantiate inode and assign the unopened fid to the dentry */ 887 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 888 fid = p9_client_walk(dfid, 1, &name, 1); 889 if (IS_ERR(fid)) { 890 err = PTR_ERR(fid); 891 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", 892 err); 893 fid = NULL; 894 goto error; 895 } 896 897 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 898 if (IS_ERR(inode)) { 899 err = PTR_ERR(inode); 900 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", 901 err); 902 goto error; 903 } 904 err = v9fs_fid_add(dentry, fid); 905 if (err < 0) 906 goto error; 907 d_instantiate(dentry, inode); 908 fid = NULL; 909 } else { 910 /* 911 * Not in cached mode. No need to populate inode with stat. 912 * socket syscall returns a fd, so we need instantiate 913 */ 914 inode = v9fs_get_inode(dir->i_sb, mode, rdev); 915 if (IS_ERR(inode)) { 916 err = PTR_ERR(inode); 917 goto error; 918 } 919 d_instantiate(dentry, inode); 920 } 921 /* Now set the ACL based on the default value */ 922 v9fs_set_create_acl(dentry, &dacl, &pacl); 923 error: 924 if (fid) 925 p9_client_clunk(fid); 926 v9fs_set_create_acl(NULL, &dacl, &pacl); 927 return err; 928 } 929 930 /** 931 * v9fs_vfs_follow_link_dotl - follow a symlink path 932 * @dentry: dentry for symlink 933 * @nd: nameidata 934 * 935 */ 936 937 static void * 938 v9fs_vfs_follow_link_dotl(struct dentry *dentry, struct nameidata *nd) 939 { 940 int retval; 941 struct p9_fid *fid; 942 char *link = __getname(); 943 char *target; 944 945 p9_debug(P9_DEBUG_VFS, "%s\n", dentry->d_name.name); 946 947 if (!link) { 948 link = ERR_PTR(-ENOMEM); 949 goto ndset; 950 } 951 fid = v9fs_fid_lookup(dentry); 952 if (IS_ERR(fid)) { 953 __putname(link); 954 link = ERR_CAST(fid); 955 goto ndset; 956 } 957 retval = p9_client_readlink(fid, &target); 958 if (!retval) { 959 strcpy(link, target); 960 kfree(target); 961 goto ndset; 962 } 963 __putname(link); 964 link = ERR_PTR(retval); 965 ndset: 966 nd_set_link(nd, link); 967 return NULL; 968 } 969 970 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode) 971 { 972 loff_t i_size; 973 struct p9_stat_dotl *st; 974 struct v9fs_session_info *v9ses; 975 976 v9ses = v9fs_inode2v9ses(inode); 977 st = p9_client_getattr_dotl(fid, P9_STATS_ALL); 978 if (IS_ERR(st)) 979 return PTR_ERR(st); 980 /* 981 * Don't update inode if the file type is different 982 */ 983 if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT)) 984 goto out; 985 986 spin_lock(&inode->i_lock); 987 /* 988 * We don't want to refresh inode->i_size, 989 * because we may have cached data 990 */ 991 i_size = inode->i_size; 992 v9fs_stat2inode_dotl(st, inode); 993 if (v9ses->cache) 994 inode->i_size = i_size; 995 spin_unlock(&inode->i_lock); 996 out: 997 kfree(st); 998 return 0; 999 } 1000 1001 const struct inode_operations v9fs_dir_inode_operations_dotl = { 1002 .create = v9fs_vfs_create_dotl, 1003 .lookup = v9fs_vfs_lookup, 1004 .link = v9fs_vfs_link_dotl, 1005 .symlink = v9fs_vfs_symlink_dotl, 1006 .unlink = v9fs_vfs_unlink, 1007 .mkdir = v9fs_vfs_mkdir_dotl, 1008 .rmdir = v9fs_vfs_rmdir, 1009 .mknod = v9fs_vfs_mknod_dotl, 1010 .rename = v9fs_vfs_rename, 1011 .getattr = v9fs_vfs_getattr_dotl, 1012 .setattr = v9fs_vfs_setattr_dotl, 1013 .setxattr = generic_setxattr, 1014 .getxattr = generic_getxattr, 1015 .removexattr = generic_removexattr, 1016 .listxattr = v9fs_listxattr, 1017 .get_acl = v9fs_iop_get_acl, 1018 }; 1019 1020 const struct inode_operations v9fs_file_inode_operations_dotl = { 1021 .getattr = v9fs_vfs_getattr_dotl, 1022 .setattr = v9fs_vfs_setattr_dotl, 1023 .setxattr = generic_setxattr, 1024 .getxattr = generic_getxattr, 1025 .removexattr = generic_removexattr, 1026 .listxattr = v9fs_listxattr, 1027 .get_acl = v9fs_iop_get_acl, 1028 }; 1029 1030 const struct inode_operations v9fs_symlink_inode_operations_dotl = { 1031 .readlink = generic_readlink, 1032 .follow_link = v9fs_vfs_follow_link_dotl, 1033 .put_link = v9fs_vfs_put_link, 1034 .getattr = v9fs_vfs_getattr_dotl, 1035 .setattr = v9fs_vfs_setattr_dotl, 1036 .setxattr = generic_setxattr, 1037 .getxattr = generic_getxattr, 1038 .removexattr = generic_removexattr, 1039 .listxattr = v9fs_listxattr, 1040 }; 1041