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