1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 4 * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved. 5 */ 6 7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 8 9 #include <linux/sched.h> 10 #include <linux/slab.h> 11 #include <linux/spinlock.h> 12 #include <linux/completion.h> 13 #include <linux/buffer_head.h> 14 #include <linux/blkdev.h> 15 #include <linux/kthread.h> 16 #include <linux/export.h> 17 #include <linux/namei.h> 18 #include <linux/mount.h> 19 #include <linux/gfs2_ondisk.h> 20 #include <linux/quotaops.h> 21 #include <linux/lockdep.h> 22 #include <linux/module.h> 23 #include <linux/backing-dev.h> 24 #include <linux/fs_parser.h> 25 26 #include "gfs2.h" 27 #include "incore.h" 28 #include "bmap.h" 29 #include "glock.h" 30 #include "glops.h" 31 #include "inode.h" 32 #include "recovery.h" 33 #include "rgrp.h" 34 #include "super.h" 35 #include "sys.h" 36 #include "util.h" 37 #include "log.h" 38 #include "quota.h" 39 #include "dir.h" 40 #include "meta_io.h" 41 #include "trace_gfs2.h" 42 #include "lops.h" 43 44 #define DO 0 45 #define UNDO 1 46 47 /** 48 * gfs2_tune_init - Fill a gfs2_tune structure with default values 49 * @gt: tune 50 * 51 */ 52 53 static void gfs2_tune_init(struct gfs2_tune *gt) 54 { 55 spin_lock_init(>->gt_spin); 56 57 gt->gt_quota_warn_period = 10; 58 gt->gt_quota_scale_num = 1; 59 gt->gt_quota_scale_den = 1; 60 gt->gt_new_files_jdata = 0; 61 gt->gt_max_readahead = BIT(18); 62 gt->gt_complain_secs = 10; 63 } 64 65 void free_sbd(struct gfs2_sbd *sdp) 66 { 67 if (sdp->sd_lkstats) 68 free_percpu(sdp->sd_lkstats); 69 kfree(sdp); 70 } 71 72 static struct gfs2_sbd *init_sbd(struct super_block *sb) 73 { 74 struct gfs2_sbd *sdp; 75 struct address_space *mapping; 76 77 sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL); 78 if (!sdp) 79 return NULL; 80 81 sdp->sd_vfs = sb; 82 sdp->sd_lkstats = alloc_percpu(struct gfs2_pcpu_lkstats); 83 if (!sdp->sd_lkstats) 84 goto fail; 85 sb->s_fs_info = sdp; 86 87 set_bit(SDF_NOJOURNALID, &sdp->sd_flags); 88 gfs2_tune_init(&sdp->sd_tune); 89 90 init_waitqueue_head(&sdp->sd_glock_wait); 91 init_waitqueue_head(&sdp->sd_async_glock_wait); 92 atomic_set(&sdp->sd_glock_disposal, 0); 93 init_completion(&sdp->sd_locking_init); 94 init_completion(&sdp->sd_wdack); 95 spin_lock_init(&sdp->sd_statfs_spin); 96 97 spin_lock_init(&sdp->sd_rindex_spin); 98 sdp->sd_rindex_tree.rb_node = NULL; 99 100 INIT_LIST_HEAD(&sdp->sd_jindex_list); 101 spin_lock_init(&sdp->sd_jindex_spin); 102 mutex_init(&sdp->sd_jindex_mutex); 103 init_completion(&sdp->sd_journal_ready); 104 105 INIT_LIST_HEAD(&sdp->sd_quota_list); 106 mutex_init(&sdp->sd_quota_mutex); 107 mutex_init(&sdp->sd_quota_sync_mutex); 108 init_waitqueue_head(&sdp->sd_quota_wait); 109 INIT_LIST_HEAD(&sdp->sd_trunc_list); 110 spin_lock_init(&sdp->sd_trunc_lock); 111 spin_lock_init(&sdp->sd_bitmap_lock); 112 113 mapping = &sdp->sd_aspace; 114 115 address_space_init_once(mapping); 116 mapping->a_ops = &gfs2_rgrp_aops; 117 mapping->host = sb->s_bdev->bd_inode; 118 mapping->flags = 0; 119 mapping_set_gfp_mask(mapping, GFP_NOFS); 120 mapping->private_data = NULL; 121 mapping->writeback_index = 0; 122 123 spin_lock_init(&sdp->sd_log_lock); 124 atomic_set(&sdp->sd_log_pinned, 0); 125 INIT_LIST_HEAD(&sdp->sd_log_revokes); 126 INIT_LIST_HEAD(&sdp->sd_log_ordered); 127 spin_lock_init(&sdp->sd_ordered_lock); 128 129 init_waitqueue_head(&sdp->sd_log_waitq); 130 init_waitqueue_head(&sdp->sd_logd_waitq); 131 spin_lock_init(&sdp->sd_ail_lock); 132 INIT_LIST_HEAD(&sdp->sd_ail1_list); 133 INIT_LIST_HEAD(&sdp->sd_ail2_list); 134 135 init_rwsem(&sdp->sd_log_flush_lock); 136 atomic_set(&sdp->sd_log_in_flight, 0); 137 atomic_set(&sdp->sd_reserving_log, 0); 138 init_waitqueue_head(&sdp->sd_reserving_log_wait); 139 init_waitqueue_head(&sdp->sd_log_flush_wait); 140 atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN); 141 mutex_init(&sdp->sd_freeze_mutex); 142 143 return sdp; 144 145 fail: 146 free_sbd(sdp); 147 return NULL; 148 } 149 150 /** 151 * gfs2_check_sb - Check superblock 152 * @sdp: the filesystem 153 * @sb: The superblock 154 * @silent: Don't print a message if the check fails 155 * 156 * Checks the version code of the FS is one that we understand how to 157 * read and that the sizes of the various on-disk structures have not 158 * changed. 159 */ 160 161 static int gfs2_check_sb(struct gfs2_sbd *sdp, int silent) 162 { 163 struct gfs2_sb_host *sb = &sdp->sd_sb; 164 165 if (sb->sb_magic != GFS2_MAGIC || 166 sb->sb_type != GFS2_METATYPE_SB) { 167 if (!silent) 168 pr_warn("not a GFS2 filesystem\n"); 169 return -EINVAL; 170 } 171 172 /* If format numbers match exactly, we're done. */ 173 174 if (sb->sb_fs_format == GFS2_FORMAT_FS && 175 sb->sb_multihost_format == GFS2_FORMAT_MULTI) 176 return 0; 177 178 fs_warn(sdp, "Unknown on-disk format, unable to mount\n"); 179 180 return -EINVAL; 181 } 182 183 static void end_bio_io_page(struct bio *bio) 184 { 185 struct page *page = bio->bi_private; 186 187 if (!bio->bi_status) 188 SetPageUptodate(page); 189 else 190 pr_warn("error %d reading superblock\n", bio->bi_status); 191 unlock_page(page); 192 } 193 194 static void gfs2_sb_in(struct gfs2_sbd *sdp, const void *buf) 195 { 196 struct gfs2_sb_host *sb = &sdp->sd_sb; 197 struct super_block *s = sdp->sd_vfs; 198 const struct gfs2_sb *str = buf; 199 200 sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic); 201 sb->sb_type = be32_to_cpu(str->sb_header.mh_type); 202 sb->sb_format = be32_to_cpu(str->sb_header.mh_format); 203 sb->sb_fs_format = be32_to_cpu(str->sb_fs_format); 204 sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format); 205 sb->sb_bsize = be32_to_cpu(str->sb_bsize); 206 sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift); 207 sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr); 208 sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino); 209 sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr); 210 sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino); 211 212 memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN); 213 memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN); 214 memcpy(&s->s_uuid, str->sb_uuid, 16); 215 } 216 217 /** 218 * gfs2_read_super - Read the gfs2 super block from disk 219 * @sdp: The GFS2 super block 220 * @sector: The location of the super block 221 * @error: The error code to return 222 * 223 * This uses the bio functions to read the super block from disk 224 * because we want to be 100% sure that we never read cached data. 225 * A super block is read twice only during each GFS2 mount and is 226 * never written to by the filesystem. The first time its read no 227 * locks are held, and the only details which are looked at are those 228 * relating to the locking protocol. Once locking is up and working, 229 * the sb is read again under the lock to establish the location of 230 * the master directory (contains pointers to journals etc) and the 231 * root directory. 232 * 233 * Returns: 0 on success or error 234 */ 235 236 static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector, int silent) 237 { 238 struct super_block *sb = sdp->sd_vfs; 239 struct gfs2_sb *p; 240 struct page *page; 241 struct bio *bio; 242 243 page = alloc_page(GFP_NOFS); 244 if (unlikely(!page)) 245 return -ENOMEM; 246 247 ClearPageUptodate(page); 248 ClearPageDirty(page); 249 lock_page(page); 250 251 bio = bio_alloc(GFP_NOFS, 1); 252 bio->bi_iter.bi_sector = sector * (sb->s_blocksize >> 9); 253 bio_set_dev(bio, sb->s_bdev); 254 bio_add_page(bio, page, PAGE_SIZE, 0); 255 256 bio->bi_end_io = end_bio_io_page; 257 bio->bi_private = page; 258 bio_set_op_attrs(bio, REQ_OP_READ, REQ_META); 259 submit_bio(bio); 260 wait_on_page_locked(page); 261 bio_put(bio); 262 if (!PageUptodate(page)) { 263 __free_page(page); 264 return -EIO; 265 } 266 p = kmap(page); 267 gfs2_sb_in(sdp, p); 268 kunmap(page); 269 __free_page(page); 270 return gfs2_check_sb(sdp, silent); 271 } 272 273 /** 274 * gfs2_read_sb - Read super block 275 * @sdp: The GFS2 superblock 276 * @silent: Don't print message if mount fails 277 * 278 */ 279 280 static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent) 281 { 282 u32 hash_blocks, ind_blocks, leaf_blocks; 283 u32 tmp_blocks; 284 unsigned int x; 285 int error; 286 287 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent); 288 if (error) { 289 if (!silent) 290 fs_err(sdp, "can't read superblock\n"); 291 return error; 292 } 293 294 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift - 295 GFS2_BASIC_BLOCK_SHIFT; 296 sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift); 297 sdp->sd_diptrs = (sdp->sd_sb.sb_bsize - 298 sizeof(struct gfs2_dinode)) / sizeof(u64); 299 sdp->sd_inptrs = (sdp->sd_sb.sb_bsize - 300 sizeof(struct gfs2_meta_header)) / sizeof(u64); 301 sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header); 302 sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2; 303 sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1; 304 sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64); 305 sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize - 306 sizeof(struct gfs2_meta_header)) / 307 sizeof(struct gfs2_quota_change); 308 sdp->sd_blocks_per_bitmap = (sdp->sd_sb.sb_bsize - 309 sizeof(struct gfs2_meta_header)) 310 * GFS2_NBBY; /* not the rgrp bitmap, subsequent bitmaps only */ 311 312 /* Compute maximum reservation required to add a entry to a directory */ 313 314 hash_blocks = DIV_ROUND_UP(sizeof(u64) * BIT(GFS2_DIR_MAX_DEPTH), 315 sdp->sd_jbsize); 316 317 ind_blocks = 0; 318 for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) { 319 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs); 320 ind_blocks += tmp_blocks; 321 } 322 323 leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH; 324 325 sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks; 326 327 sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize - 328 sizeof(struct gfs2_dinode); 329 sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs; 330 for (x = 2;; x++) { 331 u64 space, d; 332 u32 m; 333 334 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs; 335 d = space; 336 m = do_div(d, sdp->sd_inptrs); 337 338 if (d != sdp->sd_heightsize[x - 1] || m) 339 break; 340 sdp->sd_heightsize[x] = space; 341 } 342 sdp->sd_max_height = x; 343 sdp->sd_heightsize[x] = ~0; 344 gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT); 345 346 sdp->sd_max_dents_per_leaf = (sdp->sd_sb.sb_bsize - 347 sizeof(struct gfs2_leaf)) / 348 GFS2_MIN_DIRENT_SIZE; 349 return 0; 350 } 351 352 static int init_names(struct gfs2_sbd *sdp, int silent) 353 { 354 char *proto, *table; 355 int error = 0; 356 357 proto = sdp->sd_args.ar_lockproto; 358 table = sdp->sd_args.ar_locktable; 359 360 /* Try to autodetect */ 361 362 if (!proto[0] || !table[0]) { 363 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent); 364 if (error) 365 return error; 366 367 if (!proto[0]) 368 proto = sdp->sd_sb.sb_lockproto; 369 if (!table[0]) 370 table = sdp->sd_sb.sb_locktable; 371 } 372 373 if (!table[0]) 374 table = sdp->sd_vfs->s_id; 375 376 strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN); 377 strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN); 378 379 table = sdp->sd_table_name; 380 while ((table = strchr(table, '/'))) 381 *table = '_'; 382 383 return error; 384 } 385 386 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh, 387 int undo) 388 { 389 int error = 0; 390 391 if (undo) 392 goto fail_trans; 393 394 error = gfs2_glock_nq_num(sdp, 395 GFS2_MOUNT_LOCK, &gfs2_nondisk_glops, 396 LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE, 397 mount_gh); 398 if (error) { 399 fs_err(sdp, "can't acquire mount glock: %d\n", error); 400 goto fail; 401 } 402 403 error = gfs2_glock_nq_num(sdp, 404 GFS2_LIVE_LOCK, &gfs2_nondisk_glops, 405 LM_ST_SHARED, 406 LM_FLAG_NOEXP | GL_EXACT, 407 &sdp->sd_live_gh); 408 if (error) { 409 fs_err(sdp, "can't acquire live glock: %d\n", error); 410 goto fail_mount; 411 } 412 413 error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops, 414 CREATE, &sdp->sd_rename_gl); 415 if (error) { 416 fs_err(sdp, "can't create rename glock: %d\n", error); 417 goto fail_live; 418 } 419 420 error = gfs2_glock_get(sdp, GFS2_FREEZE_LOCK, &gfs2_freeze_glops, 421 CREATE, &sdp->sd_freeze_gl); 422 if (error) { 423 fs_err(sdp, "can't create transaction glock: %d\n", error); 424 goto fail_rename; 425 } 426 427 return 0; 428 429 fail_trans: 430 gfs2_glock_put(sdp->sd_freeze_gl); 431 fail_rename: 432 gfs2_glock_put(sdp->sd_rename_gl); 433 fail_live: 434 gfs2_glock_dq_uninit(&sdp->sd_live_gh); 435 fail_mount: 436 gfs2_glock_dq_uninit(mount_gh); 437 fail: 438 return error; 439 } 440 441 static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr, 442 u64 no_addr, const char *name) 443 { 444 struct gfs2_sbd *sdp = sb->s_fs_info; 445 struct dentry *dentry; 446 struct inode *inode; 447 448 inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0, 449 GFS2_BLKST_FREE /* ignore */); 450 if (IS_ERR(inode)) { 451 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode)); 452 return PTR_ERR(inode); 453 } 454 dentry = d_make_root(inode); 455 if (!dentry) { 456 fs_err(sdp, "can't alloc %s dentry\n", name); 457 return -ENOMEM; 458 } 459 *dptr = dentry; 460 return 0; 461 } 462 463 static int init_sb(struct gfs2_sbd *sdp, int silent) 464 { 465 struct super_block *sb = sdp->sd_vfs; 466 struct gfs2_holder sb_gh; 467 u64 no_addr; 468 int ret; 469 470 ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops, 471 LM_ST_SHARED, 0, &sb_gh); 472 if (ret) { 473 fs_err(sdp, "can't acquire superblock glock: %d\n", ret); 474 return ret; 475 } 476 477 ret = gfs2_read_sb(sdp, silent); 478 if (ret) { 479 fs_err(sdp, "can't read superblock: %d\n", ret); 480 goto out; 481 } 482 483 /* Set up the buffer cache and SB for real */ 484 if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) { 485 ret = -EINVAL; 486 fs_err(sdp, "FS block size (%u) is too small for device " 487 "block size (%u)\n", 488 sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev)); 489 goto out; 490 } 491 if (sdp->sd_sb.sb_bsize > PAGE_SIZE) { 492 ret = -EINVAL; 493 fs_err(sdp, "FS block size (%u) is too big for machine " 494 "page size (%u)\n", 495 sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE); 496 goto out; 497 } 498 sb_set_blocksize(sb, sdp->sd_sb.sb_bsize); 499 500 /* Get the root inode */ 501 no_addr = sdp->sd_sb.sb_root_dir.no_addr; 502 ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root"); 503 if (ret) 504 goto out; 505 506 /* Get the master inode */ 507 no_addr = sdp->sd_sb.sb_master_dir.no_addr; 508 ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master"); 509 if (ret) { 510 dput(sdp->sd_root_dir); 511 goto out; 512 } 513 sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir); 514 out: 515 gfs2_glock_dq_uninit(&sb_gh); 516 return ret; 517 } 518 519 static void gfs2_others_may_mount(struct gfs2_sbd *sdp) 520 { 521 char *message = "FIRSTMOUNT=Done"; 522 char *envp[] = { message, NULL }; 523 524 fs_info(sdp, "first mount done, others may mount\n"); 525 526 if (sdp->sd_lockstruct.ls_ops->lm_first_done) 527 sdp->sd_lockstruct.ls_ops->lm_first_done(sdp); 528 529 kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp); 530 } 531 532 /** 533 * gfs2_jindex_hold - Grab a lock on the jindex 534 * @sdp: The GFS2 superblock 535 * @ji_gh: the holder for the jindex glock 536 * 537 * Returns: errno 538 */ 539 540 static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh) 541 { 542 struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex); 543 struct qstr name; 544 char buf[20]; 545 struct gfs2_jdesc *jd; 546 int error; 547 548 name.name = buf; 549 550 mutex_lock(&sdp->sd_jindex_mutex); 551 552 for (;;) { 553 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh); 554 if (error) 555 break; 556 557 name.len = sprintf(buf, "journal%u", sdp->sd_journals); 558 name.hash = gfs2_disk_hash(name.name, name.len); 559 560 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL); 561 if (error == -ENOENT) { 562 error = 0; 563 break; 564 } 565 566 gfs2_glock_dq_uninit(ji_gh); 567 568 if (error) 569 break; 570 571 error = -ENOMEM; 572 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL); 573 if (!jd) 574 break; 575 576 INIT_LIST_HEAD(&jd->extent_list); 577 INIT_LIST_HEAD(&jd->jd_revoke_list); 578 579 INIT_WORK(&jd->jd_work, gfs2_recover_func); 580 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1); 581 if (IS_ERR_OR_NULL(jd->jd_inode)) { 582 if (!jd->jd_inode) 583 error = -ENOENT; 584 else 585 error = PTR_ERR(jd->jd_inode); 586 kfree(jd); 587 break; 588 } 589 590 spin_lock(&sdp->sd_jindex_spin); 591 jd->jd_jid = sdp->sd_journals++; 592 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list); 593 spin_unlock(&sdp->sd_jindex_spin); 594 } 595 596 mutex_unlock(&sdp->sd_jindex_mutex); 597 598 return error; 599 } 600 601 /** 602 * check_journal_clean - Make sure a journal is clean for a spectator mount 603 * @sdp: The GFS2 superblock 604 * @jd: The journal descriptor 605 * 606 * Returns: 0 if the journal is clean or locked, else an error 607 */ 608 static int check_journal_clean(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd) 609 { 610 int error; 611 struct gfs2_holder j_gh; 612 struct gfs2_log_header_host head; 613 struct gfs2_inode *ip; 614 615 ip = GFS2_I(jd->jd_inode); 616 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_NOEXP | 617 GL_EXACT | GL_NOCACHE, &j_gh); 618 if (error) { 619 fs_err(sdp, "Error locking journal for spectator mount.\n"); 620 return -EPERM; 621 } 622 error = gfs2_jdesc_check(jd); 623 if (error) { 624 fs_err(sdp, "Error checking journal for spectator mount.\n"); 625 goto out_unlock; 626 } 627 error = gfs2_find_jhead(jd, &head, false); 628 if (error) { 629 fs_err(sdp, "Error parsing journal for spectator mount.\n"); 630 goto out_unlock; 631 } 632 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) { 633 error = -EPERM; 634 fs_err(sdp, "jid=%u: Journal is dirty, so the first mounter " 635 "must not be a spectator.\n", jd->jd_jid); 636 } 637 638 out_unlock: 639 gfs2_glock_dq_uninit(&j_gh); 640 return error; 641 } 642 643 static int init_journal(struct gfs2_sbd *sdp, int undo) 644 { 645 struct inode *master = d_inode(sdp->sd_master_dir); 646 struct gfs2_holder ji_gh; 647 struct gfs2_inode *ip; 648 int jindex = 1; 649 int error = 0; 650 651 if (undo) { 652 jindex = 0; 653 goto fail_jinode_gh; 654 } 655 656 sdp->sd_jindex = gfs2_lookup_simple(master, "jindex"); 657 if (IS_ERR(sdp->sd_jindex)) { 658 fs_err(sdp, "can't lookup journal index: %d\n", error); 659 return PTR_ERR(sdp->sd_jindex); 660 } 661 662 /* Load in the journal index special file */ 663 664 error = gfs2_jindex_hold(sdp, &ji_gh); 665 if (error) { 666 fs_err(sdp, "can't read journal index: %d\n", error); 667 goto fail; 668 } 669 670 error = -EUSERS; 671 if (!gfs2_jindex_size(sdp)) { 672 fs_err(sdp, "no journals!\n"); 673 goto fail_jindex; 674 } 675 676 atomic_set(&sdp->sd_log_blks_needed, 0); 677 if (sdp->sd_args.ar_spectator) { 678 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0); 679 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks); 680 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5); 681 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5); 682 } else { 683 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) { 684 fs_err(sdp, "can't mount journal #%u\n", 685 sdp->sd_lockstruct.ls_jid); 686 fs_err(sdp, "there are only %u journals (0 - %u)\n", 687 gfs2_jindex_size(sdp), 688 gfs2_jindex_size(sdp) - 1); 689 goto fail_jindex; 690 } 691 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid); 692 693 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid, 694 &gfs2_journal_glops, 695 LM_ST_EXCLUSIVE, LM_FLAG_NOEXP, 696 &sdp->sd_journal_gh); 697 if (error) { 698 fs_err(sdp, "can't acquire journal glock: %d\n", error); 699 goto fail_jindex; 700 } 701 702 ip = GFS2_I(sdp->sd_jdesc->jd_inode); 703 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 704 LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE, 705 &sdp->sd_jinode_gh); 706 if (error) { 707 fs_err(sdp, "can't acquire journal inode glock: %d\n", 708 error); 709 goto fail_journal_gh; 710 } 711 712 error = gfs2_jdesc_check(sdp->sd_jdesc); 713 if (error) { 714 fs_err(sdp, "my journal (%u) is bad: %d\n", 715 sdp->sd_jdesc->jd_jid, error); 716 goto fail_jinode_gh; 717 } 718 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks); 719 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5); 720 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5); 721 722 /* Map the extents for this journal's blocks */ 723 gfs2_map_journal_extents(sdp, sdp->sd_jdesc); 724 } 725 trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free)); 726 727 if (sdp->sd_lockstruct.ls_first) { 728 unsigned int x; 729 for (x = 0; x < sdp->sd_journals; x++) { 730 struct gfs2_jdesc *jd = gfs2_jdesc_find(sdp, x); 731 732 if (sdp->sd_args.ar_spectator) { 733 error = check_journal_clean(sdp, jd); 734 if (error) 735 goto fail_jinode_gh; 736 continue; 737 } 738 error = gfs2_recover_journal(jd, true); 739 if (error) { 740 fs_err(sdp, "error recovering journal %u: %d\n", 741 x, error); 742 goto fail_jinode_gh; 743 } 744 } 745 746 gfs2_others_may_mount(sdp); 747 } else if (!sdp->sd_args.ar_spectator) { 748 error = gfs2_recover_journal(sdp->sd_jdesc, true); 749 if (error) { 750 fs_err(sdp, "error recovering my journal: %d\n", error); 751 goto fail_jinode_gh; 752 } 753 } 754 755 sdp->sd_log_idle = 1; 756 set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags); 757 gfs2_glock_dq_uninit(&ji_gh); 758 jindex = 0; 759 INIT_WORK(&sdp->sd_freeze_work, gfs2_freeze_func); 760 return 0; 761 762 fail_jinode_gh: 763 if (!sdp->sd_args.ar_spectator) 764 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh); 765 fail_journal_gh: 766 if (!sdp->sd_args.ar_spectator) 767 gfs2_glock_dq_uninit(&sdp->sd_journal_gh); 768 fail_jindex: 769 gfs2_jindex_free(sdp); 770 if (jindex) 771 gfs2_glock_dq_uninit(&ji_gh); 772 fail: 773 iput(sdp->sd_jindex); 774 return error; 775 } 776 777 static struct lock_class_key gfs2_quota_imutex_key; 778 779 static int init_inodes(struct gfs2_sbd *sdp, int undo) 780 { 781 int error = 0; 782 struct inode *master = d_inode(sdp->sd_master_dir); 783 784 if (undo) 785 goto fail_qinode; 786 787 error = init_journal(sdp, undo); 788 complete_all(&sdp->sd_journal_ready); 789 if (error) 790 goto fail; 791 792 /* Read in the master statfs inode */ 793 sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs"); 794 if (IS_ERR(sdp->sd_statfs_inode)) { 795 error = PTR_ERR(sdp->sd_statfs_inode); 796 fs_err(sdp, "can't read in statfs inode: %d\n", error); 797 goto fail_journal; 798 } 799 800 /* Read in the resource index inode */ 801 sdp->sd_rindex = gfs2_lookup_simple(master, "rindex"); 802 if (IS_ERR(sdp->sd_rindex)) { 803 error = PTR_ERR(sdp->sd_rindex); 804 fs_err(sdp, "can't get resource index inode: %d\n", error); 805 goto fail_statfs; 806 } 807 sdp->sd_rindex_uptodate = 0; 808 809 /* Read in the quota inode */ 810 sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota"); 811 if (IS_ERR(sdp->sd_quota_inode)) { 812 error = PTR_ERR(sdp->sd_quota_inode); 813 fs_err(sdp, "can't get quota file inode: %d\n", error); 814 goto fail_rindex; 815 } 816 /* 817 * i_rwsem on quota files is special. Since this inode is hidden system 818 * file, we are safe to define locking ourselves. 819 */ 820 lockdep_set_class(&sdp->sd_quota_inode->i_rwsem, 821 &gfs2_quota_imutex_key); 822 823 error = gfs2_rindex_update(sdp); 824 if (error) 825 goto fail_qinode; 826 827 return 0; 828 829 fail_qinode: 830 iput(sdp->sd_quota_inode); 831 fail_rindex: 832 gfs2_clear_rgrpd(sdp); 833 iput(sdp->sd_rindex); 834 fail_statfs: 835 iput(sdp->sd_statfs_inode); 836 fail_journal: 837 init_journal(sdp, UNDO); 838 fail: 839 return error; 840 } 841 842 static int init_per_node(struct gfs2_sbd *sdp, int undo) 843 { 844 struct inode *pn = NULL; 845 char buf[30]; 846 int error = 0; 847 struct gfs2_inode *ip; 848 struct inode *master = d_inode(sdp->sd_master_dir); 849 850 if (sdp->sd_args.ar_spectator) 851 return 0; 852 853 if (undo) 854 goto fail_qc_gh; 855 856 pn = gfs2_lookup_simple(master, "per_node"); 857 if (IS_ERR(pn)) { 858 error = PTR_ERR(pn); 859 fs_err(sdp, "can't find per_node directory: %d\n", error); 860 return error; 861 } 862 863 sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid); 864 sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf); 865 if (IS_ERR(sdp->sd_sc_inode)) { 866 error = PTR_ERR(sdp->sd_sc_inode); 867 fs_err(sdp, "can't find local \"sc\" file: %d\n", error); 868 goto fail; 869 } 870 871 sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid); 872 sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf); 873 if (IS_ERR(sdp->sd_qc_inode)) { 874 error = PTR_ERR(sdp->sd_qc_inode); 875 fs_err(sdp, "can't find local \"qc\" file: %d\n", error); 876 goto fail_ut_i; 877 } 878 879 iput(pn); 880 pn = NULL; 881 882 ip = GFS2_I(sdp->sd_sc_inode); 883 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, 884 &sdp->sd_sc_gh); 885 if (error) { 886 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error); 887 goto fail_qc_i; 888 } 889 890 ip = GFS2_I(sdp->sd_qc_inode); 891 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, 892 &sdp->sd_qc_gh); 893 if (error) { 894 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error); 895 goto fail_ut_gh; 896 } 897 898 return 0; 899 900 fail_qc_gh: 901 gfs2_glock_dq_uninit(&sdp->sd_qc_gh); 902 fail_ut_gh: 903 gfs2_glock_dq_uninit(&sdp->sd_sc_gh); 904 fail_qc_i: 905 iput(sdp->sd_qc_inode); 906 fail_ut_i: 907 iput(sdp->sd_sc_inode); 908 fail: 909 iput(pn); 910 return error; 911 } 912 913 static const match_table_t nolock_tokens = { 914 { Opt_jid, "jid=%d\n", }, 915 { Opt_err, NULL }, 916 }; 917 918 static const struct lm_lockops nolock_ops = { 919 .lm_proto_name = "lock_nolock", 920 .lm_put_lock = gfs2_glock_free, 921 .lm_tokens = &nolock_tokens, 922 }; 923 924 /** 925 * gfs2_lm_mount - mount a locking protocol 926 * @sdp: the filesystem 927 * @args: mount arguments 928 * @silent: if 1, don't complain if the FS isn't a GFS2 fs 929 * 930 * Returns: errno 931 */ 932 933 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent) 934 { 935 const struct lm_lockops *lm; 936 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 937 struct gfs2_args *args = &sdp->sd_args; 938 const char *proto = sdp->sd_proto_name; 939 const char *table = sdp->sd_table_name; 940 char *o, *options; 941 int ret; 942 943 if (!strcmp("lock_nolock", proto)) { 944 lm = &nolock_ops; 945 sdp->sd_args.ar_localflocks = 1; 946 #ifdef CONFIG_GFS2_FS_LOCKING_DLM 947 } else if (!strcmp("lock_dlm", proto)) { 948 lm = &gfs2_dlm_ops; 949 #endif 950 } else { 951 pr_info("can't find protocol %s\n", proto); 952 return -ENOENT; 953 } 954 955 fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table); 956 957 ls->ls_ops = lm; 958 ls->ls_first = 1; 959 960 for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) { 961 substring_t tmp[MAX_OPT_ARGS]; 962 int token, option; 963 964 if (!o || !*o) 965 continue; 966 967 token = match_token(o, *lm->lm_tokens, tmp); 968 switch (token) { 969 case Opt_jid: 970 ret = match_int(&tmp[0], &option); 971 if (ret || option < 0) 972 goto hostdata_error; 973 if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags)) 974 ls->ls_jid = option; 975 break; 976 case Opt_id: 977 case Opt_nodir: 978 /* Obsolete, but left for backward compat purposes */ 979 break; 980 case Opt_first: 981 ret = match_int(&tmp[0], &option); 982 if (ret || (option != 0 && option != 1)) 983 goto hostdata_error; 984 ls->ls_first = option; 985 break; 986 case Opt_err: 987 default: 988 hostdata_error: 989 fs_info(sdp, "unknown hostdata (%s)\n", o); 990 return -EINVAL; 991 } 992 } 993 994 if (lm->lm_mount == NULL) { 995 fs_info(sdp, "Now mounting FS...\n"); 996 complete_all(&sdp->sd_locking_init); 997 return 0; 998 } 999 ret = lm->lm_mount(sdp, table); 1000 if (ret == 0) 1001 fs_info(sdp, "Joined cluster. Now mounting FS...\n"); 1002 complete_all(&sdp->sd_locking_init); 1003 return ret; 1004 } 1005 1006 void gfs2_lm_unmount(struct gfs2_sbd *sdp) 1007 { 1008 const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops; 1009 if (likely(!test_bit(SDF_WITHDRAWN, &sdp->sd_flags)) && 1010 lm->lm_unmount) 1011 lm->lm_unmount(sdp); 1012 } 1013 1014 static int wait_on_journal(struct gfs2_sbd *sdp) 1015 { 1016 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL) 1017 return 0; 1018 1019 return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, TASK_INTERRUPTIBLE) 1020 ? -EINTR : 0; 1021 } 1022 1023 void gfs2_online_uevent(struct gfs2_sbd *sdp) 1024 { 1025 struct super_block *sb = sdp->sd_vfs; 1026 char ro[20]; 1027 char spectator[20]; 1028 char *envp[] = { ro, spectator, NULL }; 1029 sprintf(ro, "RDONLY=%d", sb_rdonly(sb)); 1030 sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0); 1031 kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp); 1032 } 1033 1034 /** 1035 * gfs2_fill_super - Read in superblock 1036 * @sb: The VFS superblock 1037 * @args: Mount options 1038 * @silent: Don't complain if it's not a GFS2 filesystem 1039 * 1040 * Returns: -errno 1041 */ 1042 static int gfs2_fill_super(struct super_block *sb, struct fs_context *fc) 1043 { 1044 struct gfs2_args *args = fc->fs_private; 1045 int silent = fc->sb_flags & SB_SILENT; 1046 struct gfs2_sbd *sdp; 1047 struct gfs2_holder mount_gh; 1048 int error; 1049 1050 sdp = init_sbd(sb); 1051 if (!sdp) { 1052 pr_warn("can't alloc struct gfs2_sbd\n"); 1053 return -ENOMEM; 1054 } 1055 sdp->sd_args = *args; 1056 1057 if (sdp->sd_args.ar_spectator) { 1058 sb->s_flags |= SB_RDONLY; 1059 set_bit(SDF_RORECOVERY, &sdp->sd_flags); 1060 } 1061 if (sdp->sd_args.ar_posix_acl) 1062 sb->s_flags |= SB_POSIXACL; 1063 if (sdp->sd_args.ar_nobarrier) 1064 set_bit(SDF_NOBARRIERS, &sdp->sd_flags); 1065 1066 sb->s_flags |= SB_NOSEC; 1067 sb->s_magic = GFS2_MAGIC; 1068 sb->s_op = &gfs2_super_ops; 1069 sb->s_d_op = &gfs2_dops; 1070 sb->s_export_op = &gfs2_export_ops; 1071 sb->s_xattr = gfs2_xattr_handlers; 1072 sb->s_qcop = &gfs2_quotactl_ops; 1073 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; 1074 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE; 1075 sb->s_time_gran = 1; 1076 sb->s_maxbytes = MAX_LFS_FILESIZE; 1077 1078 /* Set up the buffer cache and fill in some fake block size values 1079 to allow us to read-in the on-disk superblock. */ 1080 sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK); 1081 sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits; 1082 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift - 1083 GFS2_BASIC_BLOCK_SHIFT; 1084 sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift); 1085 1086 sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit; 1087 sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum; 1088 if (sdp->sd_args.ar_statfs_quantum) { 1089 sdp->sd_tune.gt_statfs_slow = 0; 1090 sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum; 1091 } else { 1092 sdp->sd_tune.gt_statfs_slow = 1; 1093 sdp->sd_tune.gt_statfs_quantum = 30; 1094 } 1095 1096 error = init_names(sdp, silent); 1097 if (error) { 1098 /* In this case, we haven't initialized sysfs, so we have to 1099 manually free the sdp. */ 1100 free_sbd(sdp); 1101 sb->s_fs_info = NULL; 1102 return error; 1103 } 1104 1105 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s", sdp->sd_table_name); 1106 1107 error = gfs2_sys_fs_add(sdp); 1108 /* 1109 * If we hit an error here, gfs2_sys_fs_add will have called function 1110 * kobject_put which causes the sysfs usage count to go to zero, which 1111 * causes sysfs to call function gfs2_sbd_release, which frees sdp. 1112 * Subsequent error paths here will call gfs2_sys_fs_del, which also 1113 * kobject_put to free sdp. 1114 */ 1115 if (error) 1116 return error; 1117 1118 gfs2_create_debugfs_file(sdp); 1119 1120 error = gfs2_lm_mount(sdp, silent); 1121 if (error) 1122 goto fail_debug; 1123 1124 error = init_locking(sdp, &mount_gh, DO); 1125 if (error) 1126 goto fail_lm; 1127 1128 error = init_sb(sdp, silent); 1129 if (error) 1130 goto fail_locking; 1131 1132 error = wait_on_journal(sdp); 1133 if (error) 1134 goto fail_sb; 1135 1136 /* 1137 * If user space has failed to join the cluster or some similar 1138 * failure has occurred, then the journal id will contain a 1139 * negative (error) number. This will then be returned to the 1140 * caller (of the mount syscall). We do this even for spectator 1141 * mounts (which just write a jid of 0 to indicate "ok" even though 1142 * the jid is unused in the spectator case) 1143 */ 1144 if (sdp->sd_lockstruct.ls_jid < 0) { 1145 error = sdp->sd_lockstruct.ls_jid; 1146 sdp->sd_lockstruct.ls_jid = 0; 1147 goto fail_sb; 1148 } 1149 1150 if (sdp->sd_args.ar_spectator) 1151 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.s", 1152 sdp->sd_table_name); 1153 else 1154 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.%u", 1155 sdp->sd_table_name, sdp->sd_lockstruct.ls_jid); 1156 1157 error = init_inodes(sdp, DO); 1158 if (error) 1159 goto fail_sb; 1160 1161 error = init_per_node(sdp, DO); 1162 if (error) 1163 goto fail_inodes; 1164 1165 error = gfs2_statfs_init(sdp); 1166 if (error) { 1167 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error); 1168 goto fail_per_node; 1169 } 1170 1171 if (!sb_rdonly(sb)) { 1172 error = gfs2_make_fs_rw(sdp); 1173 if (error) { 1174 fs_err(sdp, "can't make FS RW: %d\n", error); 1175 goto fail_per_node; 1176 } 1177 } 1178 1179 gfs2_glock_dq_uninit(&mount_gh); 1180 gfs2_online_uevent(sdp); 1181 return 0; 1182 1183 fail_per_node: 1184 init_per_node(sdp, UNDO); 1185 fail_inodes: 1186 init_inodes(sdp, UNDO); 1187 fail_sb: 1188 if (sdp->sd_root_dir) 1189 dput(sdp->sd_root_dir); 1190 if (sdp->sd_master_dir) 1191 dput(sdp->sd_master_dir); 1192 if (sb->s_root) 1193 dput(sb->s_root); 1194 sb->s_root = NULL; 1195 fail_locking: 1196 init_locking(sdp, &mount_gh, UNDO); 1197 fail_lm: 1198 complete_all(&sdp->sd_journal_ready); 1199 gfs2_gl_hash_clear(sdp); 1200 gfs2_lm_unmount(sdp); 1201 fail_debug: 1202 gfs2_delete_debugfs_file(sdp); 1203 /* gfs2_sys_fs_del must be the last thing we do, since it causes 1204 * sysfs to call function gfs2_sbd_release, which frees sdp. */ 1205 gfs2_sys_fs_del(sdp); 1206 sb->s_fs_info = NULL; 1207 return error; 1208 } 1209 1210 /** 1211 * gfs2_get_tree - Get the GFS2 superblock and root directory 1212 * @fc: The filesystem context 1213 * 1214 * Returns: 0 or -errno on error 1215 */ 1216 static int gfs2_get_tree(struct fs_context *fc) 1217 { 1218 struct gfs2_args *args = fc->fs_private; 1219 struct gfs2_sbd *sdp; 1220 int error; 1221 1222 error = get_tree_bdev(fc, gfs2_fill_super); 1223 if (error) 1224 return error; 1225 1226 sdp = fc->root->d_sb->s_fs_info; 1227 dput(fc->root); 1228 if (args->ar_meta) 1229 fc->root = dget(sdp->sd_master_dir); 1230 else 1231 fc->root = dget(sdp->sd_root_dir); 1232 return 0; 1233 } 1234 1235 static void gfs2_fc_free(struct fs_context *fc) 1236 { 1237 struct gfs2_args *args = fc->fs_private; 1238 1239 kfree(args); 1240 } 1241 1242 enum gfs2_param { 1243 Opt_lockproto, 1244 Opt_locktable, 1245 Opt_hostdata, 1246 Opt_spectator, 1247 Opt_ignore_local_fs, 1248 Opt_localflocks, 1249 Opt_localcaching, 1250 Opt_debug, 1251 Opt_upgrade, 1252 Opt_acl, 1253 Opt_quota, 1254 Opt_suiddir, 1255 Opt_data, 1256 Opt_meta, 1257 Opt_discard, 1258 Opt_commit, 1259 Opt_errors, 1260 Opt_statfs_quantum, 1261 Opt_statfs_percent, 1262 Opt_quota_quantum, 1263 Opt_barrier, 1264 Opt_rgrplvb, 1265 Opt_loccookie, 1266 }; 1267 1268 enum opt_quota { 1269 Opt_quota_unset = 0, 1270 Opt_quota_off, 1271 Opt_quota_account, 1272 Opt_quota_on, 1273 }; 1274 1275 static const unsigned int opt_quota_values[] = { 1276 [Opt_quota_off] = GFS2_QUOTA_OFF, 1277 [Opt_quota_account] = GFS2_QUOTA_ACCOUNT, 1278 [Opt_quota_on] = GFS2_QUOTA_ON, 1279 }; 1280 1281 enum opt_data { 1282 Opt_data_writeback = GFS2_DATA_WRITEBACK, 1283 Opt_data_ordered = GFS2_DATA_ORDERED, 1284 }; 1285 1286 enum opt_errors { 1287 Opt_errors_withdraw = GFS2_ERRORS_WITHDRAW, 1288 Opt_errors_panic = GFS2_ERRORS_PANIC, 1289 }; 1290 1291 static const struct fs_parameter_spec gfs2_param_specs[] = { 1292 fsparam_string ("lockproto", Opt_lockproto), 1293 fsparam_string ("locktable", Opt_locktable), 1294 fsparam_string ("hostdata", Opt_hostdata), 1295 fsparam_flag ("spectator", Opt_spectator), 1296 fsparam_flag ("norecovery", Opt_spectator), 1297 fsparam_flag ("ignore_local_fs", Opt_ignore_local_fs), 1298 fsparam_flag ("localflocks", Opt_localflocks), 1299 fsparam_flag ("localcaching", Opt_localcaching), 1300 fsparam_flag_no("debug", Opt_debug), 1301 fsparam_flag ("upgrade", Opt_upgrade), 1302 fsparam_flag_no("acl", Opt_acl), 1303 fsparam_flag_no("suiddir", Opt_suiddir), 1304 fsparam_enum ("data", Opt_data), 1305 fsparam_flag ("meta", Opt_meta), 1306 fsparam_flag_no("discard", Opt_discard), 1307 fsparam_s32 ("commit", Opt_commit), 1308 fsparam_enum ("errors", Opt_errors), 1309 fsparam_s32 ("statfs_quantum", Opt_statfs_quantum), 1310 fsparam_s32 ("statfs_percent", Opt_statfs_percent), 1311 fsparam_s32 ("quota_quantum", Opt_quota_quantum), 1312 fsparam_flag_no("barrier", Opt_barrier), 1313 fsparam_flag_no("rgrplvb", Opt_rgrplvb), 1314 fsparam_flag_no("loccookie", Opt_loccookie), 1315 /* quota can be a flag or an enum so it gets special treatment */ 1316 __fsparam(fs_param_is_enum, "quota", Opt_quota, fs_param_neg_with_no|fs_param_v_optional), 1317 {} 1318 }; 1319 1320 static const struct fs_parameter_enum gfs2_param_enums[] = { 1321 { Opt_quota, "off", Opt_quota_off }, 1322 { Opt_quota, "account", Opt_quota_account }, 1323 { Opt_quota, "on", Opt_quota_on }, 1324 { Opt_data, "writeback", Opt_data_writeback }, 1325 { Opt_data, "ordered", Opt_data_ordered }, 1326 { Opt_errors, "withdraw", Opt_errors_withdraw }, 1327 { Opt_errors, "panic", Opt_errors_panic }, 1328 {} 1329 }; 1330 1331 const struct fs_parameter_description gfs2_fs_parameters = { 1332 .name = "gfs2", 1333 .specs = gfs2_param_specs, 1334 .enums = gfs2_param_enums, 1335 }; 1336 1337 /* Parse a single mount parameter */ 1338 static int gfs2_parse_param(struct fs_context *fc, struct fs_parameter *param) 1339 { 1340 struct gfs2_args *args = fc->fs_private; 1341 struct fs_parse_result result; 1342 int o; 1343 1344 o = fs_parse(fc, &gfs2_fs_parameters, param, &result); 1345 if (o < 0) 1346 return o; 1347 1348 switch (o) { 1349 case Opt_lockproto: 1350 strlcpy(args->ar_lockproto, param->string, GFS2_LOCKNAME_LEN); 1351 break; 1352 case Opt_locktable: 1353 strlcpy(args->ar_locktable, param->string, GFS2_LOCKNAME_LEN); 1354 break; 1355 case Opt_hostdata: 1356 strlcpy(args->ar_hostdata, param->string, GFS2_LOCKNAME_LEN); 1357 break; 1358 case Opt_spectator: 1359 args->ar_spectator = 1; 1360 break; 1361 case Opt_ignore_local_fs: 1362 /* Retained for backwards compat only */ 1363 break; 1364 case Opt_localflocks: 1365 args->ar_localflocks = 1; 1366 break; 1367 case Opt_localcaching: 1368 /* Retained for backwards compat only */ 1369 break; 1370 case Opt_debug: 1371 if (result.boolean && args->ar_errors == GFS2_ERRORS_PANIC) 1372 return invalf(fc, "gfs2: -o debug and -o errors=panic are mutually exclusive"); 1373 args->ar_debug = result.boolean; 1374 break; 1375 case Opt_upgrade: 1376 /* Retained for backwards compat only */ 1377 break; 1378 case Opt_acl: 1379 args->ar_posix_acl = result.boolean; 1380 break; 1381 case Opt_quota: 1382 /* The quota option can be a flag or an enum. A non-zero int_32 1383 result means that we have an enum index. Otherwise we have 1384 to rely on the 'negated' flag to tell us whether 'quota' or 1385 'noquota' was specified. */ 1386 if (result.negated) 1387 args->ar_quota = GFS2_QUOTA_OFF; 1388 else if (result.int_32 > 0) 1389 args->ar_quota = opt_quota_values[result.int_32]; 1390 else 1391 args->ar_quota = GFS2_QUOTA_ON; 1392 break; 1393 case Opt_suiddir: 1394 args->ar_suiddir = result.boolean; 1395 break; 1396 case Opt_data: 1397 /* The uint_32 result maps directly to GFS2_DATA_* */ 1398 args->ar_data = result.uint_32; 1399 break; 1400 case Opt_meta: 1401 args->ar_meta = 1; 1402 break; 1403 case Opt_discard: 1404 args->ar_discard = result.boolean; 1405 break; 1406 case Opt_commit: 1407 if (result.int_32 <= 0) 1408 return invalf(fc, "gfs2: commit mount option requires a positive numeric argument"); 1409 args->ar_commit = result.int_32; 1410 break; 1411 case Opt_statfs_quantum: 1412 if (result.int_32 < 0) 1413 return invalf(fc, "gfs2: statfs_quantum mount option requires a non-negative numeric argument"); 1414 args->ar_statfs_quantum = result.int_32; 1415 break; 1416 case Opt_quota_quantum: 1417 if (result.int_32 <= 0) 1418 return invalf(fc, "gfs2: quota_quantum mount option requires a positive numeric argument"); 1419 args->ar_quota_quantum = result.int_32; 1420 break; 1421 case Opt_statfs_percent: 1422 if (result.int_32 < 0 || result.int_32 > 100) 1423 return invalf(fc, "gfs2: statfs_percent mount option requires a numeric argument between 0 and 100"); 1424 args->ar_statfs_percent = result.int_32; 1425 break; 1426 case Opt_errors: 1427 if (args->ar_debug && result.uint_32 == GFS2_ERRORS_PANIC) 1428 return invalf(fc, "gfs2: -o debug and -o errors=panic are mutually exclusive"); 1429 args->ar_errors = result.uint_32; 1430 break; 1431 case Opt_barrier: 1432 args->ar_nobarrier = result.boolean; 1433 break; 1434 case Opt_rgrplvb: 1435 args->ar_rgrplvb = result.boolean; 1436 break; 1437 case Opt_loccookie: 1438 args->ar_loccookie = result.boolean; 1439 break; 1440 default: 1441 return invalf(fc, "gfs2: invalid mount option: %s", param->key); 1442 } 1443 return 0; 1444 } 1445 1446 static int gfs2_reconfigure(struct fs_context *fc) 1447 { 1448 struct super_block *sb = fc->root->d_sb; 1449 struct gfs2_sbd *sdp = sb->s_fs_info; 1450 struct gfs2_args *oldargs = &sdp->sd_args; 1451 struct gfs2_args *newargs = fc->fs_private; 1452 struct gfs2_tune *gt = &sdp->sd_tune; 1453 int error = 0; 1454 1455 sync_filesystem(sb); 1456 1457 spin_lock(>->gt_spin); 1458 oldargs->ar_commit = gt->gt_logd_secs; 1459 oldargs->ar_quota_quantum = gt->gt_quota_quantum; 1460 if (gt->gt_statfs_slow) 1461 oldargs->ar_statfs_quantum = 0; 1462 else 1463 oldargs->ar_statfs_quantum = gt->gt_statfs_quantum; 1464 spin_unlock(>->gt_spin); 1465 1466 if (strcmp(newargs->ar_lockproto, oldargs->ar_lockproto)) { 1467 errorf(fc, "gfs2: reconfiguration of locking protocol not allowed"); 1468 return -EINVAL; 1469 } 1470 if (strcmp(newargs->ar_locktable, oldargs->ar_locktable)) { 1471 errorf(fc, "gfs2: reconfiguration of lock table not allowed"); 1472 return -EINVAL; 1473 } 1474 if (strcmp(newargs->ar_hostdata, oldargs->ar_hostdata)) { 1475 errorf(fc, "gfs2: reconfiguration of host data not allowed"); 1476 return -EINVAL; 1477 } 1478 if (newargs->ar_spectator != oldargs->ar_spectator) { 1479 errorf(fc, "gfs2: reconfiguration of spectator mode not allowed"); 1480 return -EINVAL; 1481 } 1482 if (newargs->ar_localflocks != oldargs->ar_localflocks) { 1483 errorf(fc, "gfs2: reconfiguration of localflocks not allowed"); 1484 return -EINVAL; 1485 } 1486 if (newargs->ar_meta != oldargs->ar_meta) { 1487 errorf(fc, "gfs2: switching between gfs2 and gfs2meta not allowed"); 1488 return -EINVAL; 1489 } 1490 if (oldargs->ar_spectator) 1491 fc->sb_flags |= SB_RDONLY; 1492 1493 if ((sb->s_flags ^ fc->sb_flags) & SB_RDONLY) { 1494 if (fc->sb_flags & SB_RDONLY) { 1495 error = gfs2_make_fs_ro(sdp); 1496 if (error) 1497 errorf(fc, "gfs2: unable to remount read-only"); 1498 } else { 1499 error = gfs2_make_fs_rw(sdp); 1500 if (error) 1501 errorf(fc, "gfs2: unable to remount read-write"); 1502 } 1503 } 1504 sdp->sd_args = *newargs; 1505 1506 if (sdp->sd_args.ar_posix_acl) 1507 sb->s_flags |= SB_POSIXACL; 1508 else 1509 sb->s_flags &= ~SB_POSIXACL; 1510 if (sdp->sd_args.ar_nobarrier) 1511 set_bit(SDF_NOBARRIERS, &sdp->sd_flags); 1512 else 1513 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags); 1514 spin_lock(>->gt_spin); 1515 gt->gt_logd_secs = newargs->ar_commit; 1516 gt->gt_quota_quantum = newargs->ar_quota_quantum; 1517 if (newargs->ar_statfs_quantum) { 1518 gt->gt_statfs_slow = 0; 1519 gt->gt_statfs_quantum = newargs->ar_statfs_quantum; 1520 } 1521 else { 1522 gt->gt_statfs_slow = 1; 1523 gt->gt_statfs_quantum = 30; 1524 } 1525 spin_unlock(>->gt_spin); 1526 1527 gfs2_online_uevent(sdp); 1528 return error; 1529 } 1530 1531 static const struct fs_context_operations gfs2_context_ops = { 1532 .free = gfs2_fc_free, 1533 .parse_param = gfs2_parse_param, 1534 .get_tree = gfs2_get_tree, 1535 .reconfigure = gfs2_reconfigure, 1536 }; 1537 1538 /* Set up the filesystem mount context */ 1539 static int gfs2_init_fs_context(struct fs_context *fc) 1540 { 1541 struct gfs2_args *args; 1542 1543 args = kmalloc(sizeof(*args), GFP_KERNEL); 1544 if (args == NULL) 1545 return -ENOMEM; 1546 1547 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) { 1548 struct gfs2_sbd *sdp = fc->root->d_sb->s_fs_info; 1549 1550 *args = sdp->sd_args; 1551 } else { 1552 memset(args, 0, sizeof(*args)); 1553 args->ar_quota = GFS2_QUOTA_DEFAULT; 1554 args->ar_data = GFS2_DATA_DEFAULT; 1555 args->ar_commit = 30; 1556 args->ar_statfs_quantum = 30; 1557 args->ar_quota_quantum = 60; 1558 args->ar_errors = GFS2_ERRORS_DEFAULT; 1559 } 1560 fc->fs_private = args; 1561 fc->ops = &gfs2_context_ops; 1562 return 0; 1563 } 1564 1565 static int set_meta_super(struct super_block *s, struct fs_context *fc) 1566 { 1567 return -EINVAL; 1568 } 1569 1570 static int test_meta_super(struct super_block *s, struct fs_context *fc) 1571 { 1572 return (fc->sget_key == s->s_bdev); 1573 } 1574 1575 static int gfs2_meta_get_tree(struct fs_context *fc) 1576 { 1577 struct super_block *s; 1578 struct gfs2_sbd *sdp; 1579 struct path path; 1580 int error; 1581 1582 if (!fc->source || !*fc->source) 1583 return -EINVAL; 1584 1585 error = kern_path(fc->source, LOOKUP_FOLLOW, &path); 1586 if (error) { 1587 pr_warn("path_lookup on %s returned error %d\n", 1588 fc->source, error); 1589 return error; 1590 } 1591 fc->fs_type = &gfs2_fs_type; 1592 fc->sget_key = path.dentry->d_sb->s_bdev; 1593 s = sget_fc(fc, test_meta_super, set_meta_super); 1594 path_put(&path); 1595 if (IS_ERR(s)) { 1596 pr_warn("gfs2 mount does not exist\n"); 1597 return PTR_ERR(s); 1598 } 1599 if ((fc->sb_flags ^ s->s_flags) & SB_RDONLY) { 1600 deactivate_locked_super(s); 1601 return -EBUSY; 1602 } 1603 sdp = s->s_fs_info; 1604 fc->root = dget(sdp->sd_master_dir); 1605 return 0; 1606 } 1607 1608 static const struct fs_context_operations gfs2_meta_context_ops = { 1609 .free = gfs2_fc_free, 1610 .get_tree = gfs2_meta_get_tree, 1611 }; 1612 1613 static int gfs2_meta_init_fs_context(struct fs_context *fc) 1614 { 1615 int ret = gfs2_init_fs_context(fc); 1616 1617 if (ret) 1618 return ret; 1619 1620 fc->ops = &gfs2_meta_context_ops; 1621 return 0; 1622 } 1623 1624 static void gfs2_kill_sb(struct super_block *sb) 1625 { 1626 struct gfs2_sbd *sdp = sb->s_fs_info; 1627 1628 if (sdp == NULL) { 1629 kill_block_super(sb); 1630 return; 1631 } 1632 1633 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SYNC | GFS2_LFC_KILL_SB); 1634 dput(sdp->sd_root_dir); 1635 dput(sdp->sd_master_dir); 1636 sdp->sd_root_dir = NULL; 1637 sdp->sd_master_dir = NULL; 1638 shrink_dcache_sb(sb); 1639 kill_block_super(sb); 1640 } 1641 1642 struct file_system_type gfs2_fs_type = { 1643 .name = "gfs2", 1644 .fs_flags = FS_REQUIRES_DEV, 1645 .init_fs_context = gfs2_init_fs_context, 1646 .parameters = &gfs2_fs_parameters, 1647 .kill_sb = gfs2_kill_sb, 1648 .owner = THIS_MODULE, 1649 }; 1650 MODULE_ALIAS_FS("gfs2"); 1651 1652 struct file_system_type gfs2meta_fs_type = { 1653 .name = "gfs2meta", 1654 .fs_flags = FS_REQUIRES_DEV, 1655 .init_fs_context = gfs2_meta_init_fs_context, 1656 .owner = THIS_MODULE, 1657 }; 1658 MODULE_ALIAS_FS("gfs2meta"); 1659