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 50static int 51v9fs_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 60static kgid_t v9fs_get_fsgid_for_create(struct inode *dir_inode) 61{ 62 BUG_ON(dir_inode == NULL); 63 64 if (dir_inode->i_mode & S_ISGID) { 65 /* set_gid bit is set.*/ 66 return dir_inode->i_gid; 67 } 68 return current_fsgid(); 69} 70 71static 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 */ 94static int v9fs_test_new_inode_dotl(struct inode *inode, void *data) 95{ 96 return 0; 97} 98 99static 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 109static 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 v9fs_cache_inode_get_cookie(inode); 145 retval = v9fs_get_acl(inode, fid); 146 if (retval) 147 goto error; 148 149 unlock_new_inode(inode); 150 return inode; 151error: 152 iget_failed(inode); 153 return ERR_PTR(retval); 154 155} 156 157struct inode * 158v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid, 159 struct super_block *sb, int new) 160{ 161 struct p9_stat_dotl *st; 162 struct inode *inode = NULL; 163 164 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN); 165 if (IS_ERR(st)) 166 return ERR_CAST(st); 167 168 inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st, new); 169 kfree(st); 170 return inode; 171} 172 173struct dotl_openflag_map { 174 int open_flag; 175 int dotl_flag; 176}; 177 178static int v9fs_mapped_dotl_flags(int flags) 179{ 180 int i; 181 int rflags = 0; 182 struct dotl_openflag_map dotl_oflag_map[] = { 183 { O_CREAT, P9_DOTL_CREATE }, 184 { O_EXCL, P9_DOTL_EXCL }, 185 { O_NOCTTY, P9_DOTL_NOCTTY }, 186 { O_APPEND, P9_DOTL_APPEND }, 187 { O_NONBLOCK, P9_DOTL_NONBLOCK }, 188 { O_DSYNC, P9_DOTL_DSYNC }, 189 { FASYNC, P9_DOTL_FASYNC }, 190 { O_DIRECT, P9_DOTL_DIRECT }, 191 { O_LARGEFILE, P9_DOTL_LARGEFILE }, 192 { O_DIRECTORY, P9_DOTL_DIRECTORY }, 193 { O_NOFOLLOW, P9_DOTL_NOFOLLOW }, 194 { O_NOATIME, P9_DOTL_NOATIME }, 195 { O_CLOEXEC, P9_DOTL_CLOEXEC }, 196 { O_SYNC, P9_DOTL_SYNC}, 197 }; 198 for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) { 199 if (flags & dotl_oflag_map[i].open_flag) 200 rflags |= dotl_oflag_map[i].dotl_flag; 201 } 202 return rflags; 203} 204 205/** 206 * v9fs_open_to_dotl_flags- convert Linux specific open flags to 207 * plan 9 open flag. 208 * @flags: flags to convert 209 */ 210int v9fs_open_to_dotl_flags(int flags) 211{ 212 int rflags = 0; 213 214 /* 215 * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY 216 * and P9_DOTL_NOACCESS 217 */ 218 rflags |= flags & O_ACCMODE; 219 rflags |= v9fs_mapped_dotl_flags(flags); 220 221 return rflags; 222} 223 224/** 225 * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol. 226 * @dir: directory inode that is being created 227 * @dentry: dentry that is being deleted 228 * @omode: create permissions 229 * 230 */ 231 232static int 233v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, umode_t omode, 234 bool excl) 235{ 236 return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0); 237} 238 239static int 240v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry, 241 struct file *file, unsigned flags, umode_t omode, 242 int *opened) 243{ 244 int err = 0; 245 kgid_t gid; 246 umode_t mode; 247 char *name = NULL; 248 struct p9_qid qid; 249 struct inode *inode; 250 struct p9_fid *fid = NULL; 251 struct v9fs_inode *v9inode; 252 struct p9_fid *dfid, *ofid, *inode_fid; 253 struct v9fs_session_info *v9ses; 254 struct posix_acl *pacl = NULL, *dacl = NULL; 255 struct dentry *res = NULL; 256 257 if (d_unhashed(dentry)) { 258 res = v9fs_vfs_lookup(dir, dentry, 0); 259 if (IS_ERR(res)) 260 return PTR_ERR(res); 261 262 if (res) 263 dentry = res; 264 } 265 266 /* Only creates */ 267 if (!(flags & O_CREAT) || d_really_is_positive(dentry)) 268 return finish_no_open(file, res); 269 270 v9ses = v9fs_inode2v9ses(dir); 271 272 name = (char *) dentry->d_name.name; 273 p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%hx\n", 274 name, flags, omode); 275 276 dfid = v9fs_fid_lookup(dentry->d_parent); 277 if (IS_ERR(dfid)) { 278 err = PTR_ERR(dfid); 279 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 280 goto out; 281 } 282 283 /* clone a fid to use for creation */ 284 ofid = p9_client_walk(dfid, 0, NULL, 1); 285 if (IS_ERR(ofid)) { 286 err = PTR_ERR(ofid); 287 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 288 goto out; 289 } 290 291 gid = v9fs_get_fsgid_for_create(dir); 292 293 mode = omode; 294 /* Update mode based on ACL value */ 295 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); 296 if (err) { 297 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in creat %d\n", 298 err); 299 goto error; 300 } 301 err = p9_client_create_dotl(ofid, name, v9fs_open_to_dotl_flags(flags), 302 mode, gid, &qid); 303 if (err < 0) { 304 p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in creat %d\n", 305 err); 306 goto error; 307 } 308 v9fs_invalidate_inode_attr(dir); 309 310 /* instantiate inode and assign the unopened fid to the dentry */ 311 fid = p9_client_walk(dfid, 1, &name, 1); 312 if (IS_ERR(fid)) { 313 err = PTR_ERR(fid); 314 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 315 fid = NULL; 316 goto error; 317 } 318 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 319 if (IS_ERR(inode)) { 320 err = PTR_ERR(inode); 321 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err); 322 goto error; 323 } 324 /* Now set the ACL based on the default value */ 325 v9fs_set_create_acl(inode, fid, dacl, pacl); 326 327 v9fs_fid_add(dentry, fid); 328 d_instantiate(dentry, inode); 329 330 v9inode = V9FS_I(inode); 331 mutex_lock(&v9inode->v_mutex); 332 if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) && 333 !v9inode->writeback_fid && 334 ((flags & O_ACCMODE) != O_RDONLY)) { 335 /* 336 * clone a fid and add it to writeback_fid 337 * we do it during open time instead of 338 * page dirty time via write_begin/page_mkwrite 339 * because we want write after unlink usecase 340 * to work. 341 */ 342 inode_fid = v9fs_writeback_fid(dentry); 343 if (IS_ERR(inode_fid)) { 344 err = PTR_ERR(inode_fid); 345 mutex_unlock(&v9inode->v_mutex); 346 goto err_clunk_old_fid; 347 } 348 v9inode->writeback_fid = (void *) inode_fid; 349 } 350 mutex_unlock(&v9inode->v_mutex); 351 /* Since we are opening a file, assign the open fid to the file */ 352 err = finish_open(file, dentry, generic_file_open, opened); 353 if (err) 354 goto err_clunk_old_fid; 355 file->private_data = ofid; 356 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) 357 v9fs_cache_inode_set_cookie(inode, file); 358 *opened |= FILE_CREATED; 359out: 360 v9fs_put_acl(dacl, pacl); 361 dput(res); 362 return err; 363 364error: 365 if (fid) 366 p9_client_clunk(fid); 367err_clunk_old_fid: 368 if (ofid) 369 p9_client_clunk(ofid); 370 goto out; 371} 372 373/** 374 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory 375 * @dir: inode that is being unlinked 376 * @dentry: dentry that is being unlinked 377 * @omode: mode for new directory 378 * 379 */ 380 381static int v9fs_vfs_mkdir_dotl(struct inode *dir, 382 struct dentry *dentry, umode_t omode) 383{ 384 int err; 385 struct v9fs_session_info *v9ses; 386 struct p9_fid *fid = NULL, *dfid = NULL; 387 kgid_t gid; 388 char *name; 389 umode_t mode; 390 struct inode *inode; 391 struct p9_qid qid; 392 struct dentry *dir_dentry; 393 struct posix_acl *dacl = NULL, *pacl = NULL; 394 395 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry); 396 err = 0; 397 v9ses = v9fs_inode2v9ses(dir); 398 399 omode |= S_IFDIR; 400 if (dir->i_mode & S_ISGID) 401 omode |= S_ISGID; 402 403 dir_dentry = dentry->d_parent; 404 dfid = v9fs_fid_lookup(dir_dentry); 405 if (IS_ERR(dfid)) { 406 err = PTR_ERR(dfid); 407 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 408 dfid = NULL; 409 goto error; 410 } 411 412 gid = v9fs_get_fsgid_for_create(dir); 413 mode = omode; 414 /* Update mode based on ACL value */ 415 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); 416 if (err) { 417 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n", 418 err); 419 goto error; 420 } 421 name = (char *) dentry->d_name.name; 422 err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid); 423 if (err < 0) 424 goto error; 425 426 fid = p9_client_walk(dfid, 1, &name, 1); 427 if (IS_ERR(fid)) { 428 err = PTR_ERR(fid); 429 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", 430 err); 431 fid = NULL; 432 goto error; 433 } 434 435 /* instantiate inode and assign the unopened fid to the dentry */ 436 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 437 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 438 if (IS_ERR(inode)) { 439 err = PTR_ERR(inode); 440 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", 441 err); 442 goto error; 443 } 444 v9fs_fid_add(dentry, fid); 445 v9fs_set_create_acl(inode, fid, dacl, pacl); 446 d_instantiate(dentry, inode); 447 fid = NULL; 448 err = 0; 449 } else { 450 /* 451 * Not in cached mode. No need to populate 452 * inode with stat. We need to get an inode 453 * so that we can set the acl with dentry 454 */ 455 inode = v9fs_get_inode(dir->i_sb, mode, 0); 456 if (IS_ERR(inode)) { 457 err = PTR_ERR(inode); 458 goto error; 459 } 460 v9fs_set_create_acl(inode, fid, dacl, pacl); 461 d_instantiate(dentry, inode); 462 } 463 inc_nlink(dir); 464 v9fs_invalidate_inode_attr(dir); 465error: 466 if (fid) 467 p9_client_clunk(fid); 468 v9fs_put_acl(dacl, pacl); 469 return err; 470} 471 472static int 473v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry, 474 struct kstat *stat) 475{ 476 struct v9fs_session_info *v9ses; 477 struct p9_fid *fid; 478 struct p9_stat_dotl *st; 479 480 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry); 481 v9ses = v9fs_dentry2v9ses(dentry); 482 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 483 generic_fillattr(d_inode(dentry), 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, d_inode(dentry)); 499 generic_fillattr(d_inode(dentry), 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 520struct dotl_iattr_map { 521 int iattr_valid; 522 int p9_iattr_valid; 523}; 524 525static 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 554int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr) 555{ 556 int retval; 557 struct p9_fid *fid; 558 struct p9_iattr_dotl p9attr; 559 struct inode *inode = d_inode(dentry); 560 561 p9_debug(P9_DEBUG_VFS, "\n"); 562 563 retval = inode_change_ok(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 fid = v9fs_fid_lookup(dentry); 578 if (IS_ERR(fid)) 579 return PTR_ERR(fid); 580 581 /* Write all dirty data */ 582 if (S_ISREG(inode->i_mode)) 583 filemap_write_and_wait(inode->i_mapping); 584 585 retval = p9_client_setattr(fid, &p9attr); 586 if (retval < 0) 587 return retval; 588 589 if ((iattr->ia_valid & ATTR_SIZE) && 590 iattr->ia_size != i_size_read(inode)) 591 truncate_setsize(inode, iattr->ia_size); 592 593 v9fs_invalidate_inode_attr(inode); 594 setattr_copy(inode, iattr); 595 mark_inode_dirty(inode); 596 if (iattr->ia_valid & ATTR_MODE) { 597 /* We also want to update ACL when we update mode bits */ 598 retval = v9fs_acl_chmod(inode, fid); 599 if (retval < 0) 600 return retval; 601 } 602 return 0; 603} 604 605/** 606 * v9fs_stat2inode_dotl - populate an inode structure with stat info 607 * @stat: stat structure 608 * @inode: inode to populate 609 * 610 */ 611 612void 613v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode) 614{ 615 umode_t mode; 616 struct v9fs_inode *v9inode = V9FS_I(inode); 617 618 if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) { 619 inode->i_atime.tv_sec = stat->st_atime_sec; 620 inode->i_atime.tv_nsec = stat->st_atime_nsec; 621 inode->i_mtime.tv_sec = stat->st_mtime_sec; 622 inode->i_mtime.tv_nsec = stat->st_mtime_nsec; 623 inode->i_ctime.tv_sec = stat->st_ctime_sec; 624 inode->i_ctime.tv_nsec = stat->st_ctime_nsec; 625 inode->i_uid = stat->st_uid; 626 inode->i_gid = stat->st_gid; 627 set_nlink(inode, stat->st_nlink); 628 629 mode = stat->st_mode & S_IALLUGO; 630 mode |= inode->i_mode & ~S_IALLUGO; 631 inode->i_mode = mode; 632 633 i_size_write(inode, stat->st_size); 634 inode->i_blocks = stat->st_blocks; 635 } else { 636 if (stat->st_result_mask & P9_STATS_ATIME) { 637 inode->i_atime.tv_sec = stat->st_atime_sec; 638 inode->i_atime.tv_nsec = stat->st_atime_nsec; 639 } 640 if (stat->st_result_mask & P9_STATS_MTIME) { 641 inode->i_mtime.tv_sec = stat->st_mtime_sec; 642 inode->i_mtime.tv_nsec = stat->st_mtime_nsec; 643 } 644 if (stat->st_result_mask & P9_STATS_CTIME) { 645 inode->i_ctime.tv_sec = stat->st_ctime_sec; 646 inode->i_ctime.tv_nsec = stat->st_ctime_nsec; 647 } 648 if (stat->st_result_mask & P9_STATS_UID) 649 inode->i_uid = stat->st_uid; 650 if (stat->st_result_mask & P9_STATS_GID) 651 inode->i_gid = stat->st_gid; 652 if (stat->st_result_mask & P9_STATS_NLINK) 653 set_nlink(inode, stat->st_nlink); 654 if (stat->st_result_mask & P9_STATS_MODE) { 655 inode->i_mode = stat->st_mode; 656 if ((S_ISBLK(inode->i_mode)) || 657 (S_ISCHR(inode->i_mode))) 658 init_special_inode(inode, inode->i_mode, 659 inode->i_rdev); 660 } 661 if (stat->st_result_mask & P9_STATS_RDEV) 662 inode->i_rdev = new_decode_dev(stat->st_rdev); 663 if (stat->st_result_mask & P9_STATS_SIZE) 664 i_size_write(inode, stat->st_size); 665 if (stat->st_result_mask & P9_STATS_BLOCKS) 666 inode->i_blocks = stat->st_blocks; 667 } 668 if (stat->st_result_mask & P9_STATS_GEN) 669 inode->i_generation = stat->st_gen; 670 671 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION 672 * because the inode structure does not have fields for them. 673 */ 674 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR; 675} 676 677static int 678v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry, 679 const char *symname) 680{ 681 int err; 682 kgid_t gid; 683 char *name; 684 struct p9_qid qid; 685 struct inode *inode; 686 struct p9_fid *dfid; 687 struct p9_fid *fid = NULL; 688 struct v9fs_session_info *v9ses; 689 690 name = (char *) dentry->d_name.name; 691 p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname); 692 v9ses = v9fs_inode2v9ses(dir); 693 694 dfid = v9fs_fid_lookup(dentry->d_parent); 695 if (IS_ERR(dfid)) { 696 err = PTR_ERR(dfid); 697 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 698 return err; 699 } 700 701 gid = v9fs_get_fsgid_for_create(dir); 702 703 /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */ 704 err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid); 705 706 if (err < 0) { 707 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err); 708 goto error; 709 } 710 711 v9fs_invalidate_inode_attr(dir); 712 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 713 /* Now walk from the parent so we can get an unopened fid. */ 714 fid = p9_client_walk(dfid, 1, &name, 1); 715 if (IS_ERR(fid)) { 716 err = PTR_ERR(fid); 717 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", 718 err); 719 fid = NULL; 720 goto error; 721 } 722 723 /* instantiate inode and assign the unopened fid to dentry */ 724 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 725 if (IS_ERR(inode)) { 726 err = PTR_ERR(inode); 727 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", 728 err); 729 goto error; 730 } 731 v9fs_fid_add(dentry, fid); 732 d_instantiate(dentry, inode); 733 fid = NULL; 734 err = 0; 735 } else { 736 /* Not in cached mode. No need to populate inode with stat */ 737 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0); 738 if (IS_ERR(inode)) { 739 err = PTR_ERR(inode); 740 goto error; 741 } 742 d_instantiate(dentry, inode); 743 } 744 745error: 746 if (fid) 747 p9_client_clunk(fid); 748 749 return err; 750} 751 752/** 753 * v9fs_vfs_link_dotl - create a hardlink for dotl 754 * @old_dentry: dentry for file to link to 755 * @dir: inode destination for new link 756 * @dentry: dentry for link 757 * 758 */ 759 760static int 761v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir, 762 struct dentry *dentry) 763{ 764 int err; 765 struct dentry *dir_dentry; 766 struct p9_fid *dfid, *oldfid; 767 struct v9fs_session_info *v9ses; 768 769 p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %pd, new_name: %pd\n", 770 dir->i_ino, old_dentry, dentry); 771 772 v9ses = v9fs_inode2v9ses(dir); 773 dir_dentry = dentry->d_parent; 774 dfid = v9fs_fid_lookup(dir_dentry); 775 if (IS_ERR(dfid)) 776 return PTR_ERR(dfid); 777 778 oldfid = v9fs_fid_lookup(old_dentry); 779 if (IS_ERR(oldfid)) 780 return PTR_ERR(oldfid); 781 782 err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name); 783 784 if (err < 0) { 785 p9_debug(P9_DEBUG_VFS, "p9_client_link failed %d\n", err); 786 return err; 787 } 788 789 v9fs_invalidate_inode_attr(dir); 790 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 791 /* Get the latest stat info from server. */ 792 struct p9_fid *fid; 793 fid = v9fs_fid_lookup(old_dentry); 794 if (IS_ERR(fid)) 795 return PTR_ERR(fid); 796 797 v9fs_refresh_inode_dotl(fid, d_inode(old_dentry)); 798 } 799 ihold(d_inode(old_dentry)); 800 d_instantiate(dentry, d_inode(old_dentry)); 801 802 return err; 803} 804 805/** 806 * v9fs_vfs_mknod_dotl - create a special file 807 * @dir: inode destination for new link 808 * @dentry: dentry for file 809 * @omode: mode for creation 810 * @rdev: device associated with special file 811 * 812 */ 813static int 814v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode, 815 dev_t rdev) 816{ 817 int err; 818 kgid_t gid; 819 char *name; 820 umode_t mode; 821 struct v9fs_session_info *v9ses; 822 struct p9_fid *fid = NULL, *dfid = NULL; 823 struct inode *inode; 824 struct p9_qid qid; 825 struct dentry *dir_dentry; 826 struct posix_acl *dacl = NULL, *pacl = NULL; 827 828 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %hx MAJOR: %u MINOR: %u\n", 829 dir->i_ino, dentry, omode, 830 MAJOR(rdev), MINOR(rdev)); 831 832 if (!new_valid_dev(rdev)) 833 return -EINVAL; 834 835 v9ses = v9fs_inode2v9ses(dir); 836 dir_dentry = dentry->d_parent; 837 dfid = v9fs_fid_lookup(dir_dentry); 838 if (IS_ERR(dfid)) { 839 err = PTR_ERR(dfid); 840 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 841 dfid = NULL; 842 goto error; 843 } 844 845 gid = v9fs_get_fsgid_for_create(dir); 846 mode = omode; 847 /* Update mode based on ACL value */ 848 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl); 849 if (err) { 850 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n", 851 err); 852 goto error; 853 } 854 name = (char *) dentry->d_name.name; 855 856 err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid); 857 if (err < 0) 858 goto error; 859 860 v9fs_invalidate_inode_attr(dir); 861 fid = p9_client_walk(dfid, 1, &name, 1); 862 if (IS_ERR(fid)) { 863 err = PTR_ERR(fid); 864 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", 865 err); 866 fid = NULL; 867 goto error; 868 } 869 870 /* instantiate inode and assign the unopened fid to the dentry */ 871 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 872 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 873 if (IS_ERR(inode)) { 874 err = PTR_ERR(inode); 875 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", 876 err); 877 goto error; 878 } 879 v9fs_set_create_acl(inode, fid, dacl, pacl); 880 v9fs_fid_add(dentry, fid); 881 d_instantiate(dentry, inode); 882 fid = NULL; 883 err = 0; 884 } else { 885 /* 886 * Not in cached mode. No need to populate inode with stat. 887 * socket syscall returns a fd, so we need instantiate 888 */ 889 inode = v9fs_get_inode(dir->i_sb, mode, rdev); 890 if (IS_ERR(inode)) { 891 err = PTR_ERR(inode); 892 goto error; 893 } 894 v9fs_set_create_acl(inode, fid, dacl, pacl); 895 d_instantiate(dentry, inode); 896 } 897error: 898 if (fid) 899 p9_client_clunk(fid); 900 v9fs_put_acl(dacl, pacl); 901 return err; 902} 903 904/** 905 * v9fs_vfs_follow_link_dotl - follow a symlink path 906 * @dentry: dentry for symlink 907 * @nd: nameidata 908 * 909 */ 910 911static void * 912v9fs_vfs_follow_link_dotl(struct dentry *dentry, struct nameidata *nd) 913{ 914 int retval; 915 struct p9_fid *fid; 916 char *link = __getname(); 917 char *target; 918 919 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry); 920 921 if (!link) { 922 link = ERR_PTR(-ENOMEM); 923 goto ndset; 924 } 925 fid = v9fs_fid_lookup(dentry); 926 if (IS_ERR(fid)) { 927 __putname(link); 928 link = ERR_CAST(fid); 929 goto ndset; 930 } 931 retval = p9_client_readlink(fid, &target); 932 if (!retval) { 933 strcpy(link, target); 934 kfree(target); 935 goto ndset; 936 } 937 __putname(link); 938 link = ERR_PTR(retval); 939ndset: 940 nd_set_link(nd, link); 941 return NULL; 942} 943 944int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode) 945{ 946 loff_t i_size; 947 struct p9_stat_dotl *st; 948 struct v9fs_session_info *v9ses; 949 950 v9ses = v9fs_inode2v9ses(inode); 951 st = p9_client_getattr_dotl(fid, P9_STATS_ALL); 952 if (IS_ERR(st)) 953 return PTR_ERR(st); 954 /* 955 * Don't update inode if the file type is different 956 */ 957 if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT)) 958 goto out; 959 960 spin_lock(&inode->i_lock); 961 /* 962 * We don't want to refresh inode->i_size, 963 * because we may have cached data 964 */ 965 i_size = inode->i_size; 966 v9fs_stat2inode_dotl(st, inode); 967 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) 968 inode->i_size = i_size; 969 spin_unlock(&inode->i_lock); 970out: 971 kfree(st); 972 return 0; 973} 974 975const struct inode_operations v9fs_dir_inode_operations_dotl = { 976 .create = v9fs_vfs_create_dotl, 977 .atomic_open = v9fs_vfs_atomic_open_dotl, 978 .lookup = v9fs_vfs_lookup, 979 .link = v9fs_vfs_link_dotl, 980 .symlink = v9fs_vfs_symlink_dotl, 981 .unlink = v9fs_vfs_unlink, 982 .mkdir = v9fs_vfs_mkdir_dotl, 983 .rmdir = v9fs_vfs_rmdir, 984 .mknod = v9fs_vfs_mknod_dotl, 985 .rename = v9fs_vfs_rename, 986 .getattr = v9fs_vfs_getattr_dotl, 987 .setattr = v9fs_vfs_setattr_dotl, 988 .setxattr = generic_setxattr, 989 .getxattr = generic_getxattr, 990 .removexattr = generic_removexattr, 991 .listxattr = v9fs_listxattr, 992 .get_acl = v9fs_iop_get_acl, 993}; 994 995const struct inode_operations v9fs_file_inode_operations_dotl = { 996 .getattr = v9fs_vfs_getattr_dotl, 997 .setattr = v9fs_vfs_setattr_dotl, 998 .setxattr = generic_setxattr, 999 .getxattr = generic_getxattr, 1000 .removexattr = generic_removexattr, 1001 .listxattr = v9fs_listxattr, 1002 .get_acl = v9fs_iop_get_acl, 1003}; 1004 1005const struct inode_operations v9fs_symlink_inode_operations_dotl = { 1006 .readlink = generic_readlink, 1007 .follow_link = v9fs_vfs_follow_link_dotl, 1008 .put_link = v9fs_vfs_put_link, 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}; 1016