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_ldptrs = (sdp->sd_sb.sb_bsize - 302 sizeof(struct gfs2_log_descriptor)) / sizeof(u64); 303 sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header); 304 sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2; 305 sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1; 306 sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64); 307 sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize - 308 sizeof(struct gfs2_meta_header)) / 309 sizeof(struct gfs2_quota_change); 310 sdp->sd_blocks_per_bitmap = (sdp->sd_sb.sb_bsize - 311 sizeof(struct gfs2_meta_header)) 312 * GFS2_NBBY; /* not the rgrp bitmap, subsequent bitmaps only */ 313 314 /* Compute maximum reservation required to add a entry to a directory */ 315 316 hash_blocks = DIV_ROUND_UP(sizeof(u64) * BIT(GFS2_DIR_MAX_DEPTH), 317 sdp->sd_jbsize); 318 319 ind_blocks = 0; 320 for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) { 321 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs); 322 ind_blocks += tmp_blocks; 323 } 324 325 leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH; 326 327 sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks; 328 329 sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize - 330 sizeof(struct gfs2_dinode); 331 sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs; 332 for (x = 2;; x++) { 333 u64 space, d; 334 u32 m; 335 336 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs; 337 d = space; 338 m = do_div(d, sdp->sd_inptrs); 339 340 if (d != sdp->sd_heightsize[x - 1] || m) 341 break; 342 sdp->sd_heightsize[x] = space; 343 } 344 sdp->sd_max_height = x; 345 sdp->sd_heightsize[x] = ~0; 346 gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT); 347 348 sdp->sd_max_dents_per_leaf = (sdp->sd_sb.sb_bsize - 349 sizeof(struct gfs2_leaf)) / 350 GFS2_MIN_DIRENT_SIZE; 351 return 0; 352 } 353 354 static int init_names(struct gfs2_sbd *sdp, int silent) 355 { 356 char *proto, *table; 357 int error = 0; 358 359 proto = sdp->sd_args.ar_lockproto; 360 table = sdp->sd_args.ar_locktable; 361 362 /* Try to autodetect */ 363 364 if (!proto[0] || !table[0]) { 365 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent); 366 if (error) 367 return error; 368 369 if (!proto[0]) 370 proto = sdp->sd_sb.sb_lockproto; 371 if (!table[0]) 372 table = sdp->sd_sb.sb_locktable; 373 } 374 375 if (!table[0]) 376 table = sdp->sd_vfs->s_id; 377 378 strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN); 379 strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN); 380 381 table = sdp->sd_table_name; 382 while ((table = strchr(table, '/'))) 383 *table = '_'; 384 385 return error; 386 } 387 388 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh, 389 int undo) 390 { 391 int error = 0; 392 393 if (undo) 394 goto fail_trans; 395 396 error = gfs2_glock_nq_num(sdp, 397 GFS2_MOUNT_LOCK, &gfs2_nondisk_glops, 398 LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE, 399 mount_gh); 400 if (error) { 401 fs_err(sdp, "can't acquire mount glock: %d\n", error); 402 goto fail; 403 } 404 405 error = gfs2_glock_nq_num(sdp, 406 GFS2_LIVE_LOCK, &gfs2_nondisk_glops, 407 LM_ST_SHARED, 408 LM_FLAG_NOEXP | GL_EXACT, 409 &sdp->sd_live_gh); 410 if (error) { 411 fs_err(sdp, "can't acquire live glock: %d\n", error); 412 goto fail_mount; 413 } 414 415 error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops, 416 CREATE, &sdp->sd_rename_gl); 417 if (error) { 418 fs_err(sdp, "can't create rename glock: %d\n", error); 419 goto fail_live; 420 } 421 422 error = gfs2_glock_get(sdp, GFS2_FREEZE_LOCK, &gfs2_freeze_glops, 423 CREATE, &sdp->sd_freeze_gl); 424 if (error) { 425 fs_err(sdp, "can't create transaction glock: %d\n", error); 426 goto fail_rename; 427 } 428 429 return 0; 430 431 fail_trans: 432 gfs2_glock_put(sdp->sd_freeze_gl); 433 fail_rename: 434 gfs2_glock_put(sdp->sd_rename_gl); 435 fail_live: 436 gfs2_glock_dq_uninit(&sdp->sd_live_gh); 437 fail_mount: 438 gfs2_glock_dq_uninit(mount_gh); 439 fail: 440 return error; 441 } 442 443 static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr, 444 u64 no_addr, const char *name) 445 { 446 struct gfs2_sbd *sdp = sb->s_fs_info; 447 struct dentry *dentry; 448 struct inode *inode; 449 450 inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0, 451 GFS2_BLKST_FREE /* ignore */); 452 if (IS_ERR(inode)) { 453 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode)); 454 return PTR_ERR(inode); 455 } 456 dentry = d_make_root(inode); 457 if (!dentry) { 458 fs_err(sdp, "can't alloc %s dentry\n", name); 459 return -ENOMEM; 460 } 461 *dptr = dentry; 462 return 0; 463 } 464 465 static int init_sb(struct gfs2_sbd *sdp, int silent) 466 { 467 struct super_block *sb = sdp->sd_vfs; 468 struct gfs2_holder sb_gh; 469 u64 no_addr; 470 int ret; 471 472 ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops, 473 LM_ST_SHARED, 0, &sb_gh); 474 if (ret) { 475 fs_err(sdp, "can't acquire superblock glock: %d\n", ret); 476 return ret; 477 } 478 479 ret = gfs2_read_sb(sdp, silent); 480 if (ret) { 481 fs_err(sdp, "can't read superblock: %d\n", ret); 482 goto out; 483 } 484 485 /* Set up the buffer cache and SB for real */ 486 if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) { 487 ret = -EINVAL; 488 fs_err(sdp, "FS block size (%u) is too small for device " 489 "block size (%u)\n", 490 sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev)); 491 goto out; 492 } 493 if (sdp->sd_sb.sb_bsize > PAGE_SIZE) { 494 ret = -EINVAL; 495 fs_err(sdp, "FS block size (%u) is too big for machine " 496 "page size (%u)\n", 497 sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE); 498 goto out; 499 } 500 sb_set_blocksize(sb, sdp->sd_sb.sb_bsize); 501 502 /* Get the root inode */ 503 no_addr = sdp->sd_sb.sb_root_dir.no_addr; 504 ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root"); 505 if (ret) 506 goto out; 507 508 /* Get the master inode */ 509 no_addr = sdp->sd_sb.sb_master_dir.no_addr; 510 ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master"); 511 if (ret) { 512 dput(sdp->sd_root_dir); 513 goto out; 514 } 515 sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir); 516 out: 517 gfs2_glock_dq_uninit(&sb_gh); 518 return ret; 519 } 520 521 static void gfs2_others_may_mount(struct gfs2_sbd *sdp) 522 { 523 char *message = "FIRSTMOUNT=Done"; 524 char *envp[] = { message, NULL }; 525 526 fs_info(sdp, "first mount done, others may mount\n"); 527 528 if (sdp->sd_lockstruct.ls_ops->lm_first_done) 529 sdp->sd_lockstruct.ls_ops->lm_first_done(sdp); 530 531 kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp); 532 } 533 534 /** 535 * gfs2_jindex_hold - Grab a lock on the jindex 536 * @sdp: The GFS2 superblock 537 * @ji_gh: the holder for the jindex glock 538 * 539 * Returns: errno 540 */ 541 542 static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh) 543 { 544 struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex); 545 struct qstr name; 546 char buf[20]; 547 struct gfs2_jdesc *jd; 548 int error; 549 550 name.name = buf; 551 552 mutex_lock(&sdp->sd_jindex_mutex); 553 554 for (;;) { 555 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh); 556 if (error) 557 break; 558 559 name.len = sprintf(buf, "journal%u", sdp->sd_journals); 560 name.hash = gfs2_disk_hash(name.name, name.len); 561 562 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL); 563 if (error == -ENOENT) { 564 error = 0; 565 break; 566 } 567 568 gfs2_glock_dq_uninit(ji_gh); 569 570 if (error) 571 break; 572 573 error = -ENOMEM; 574 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL); 575 if (!jd) 576 break; 577 578 INIT_LIST_HEAD(&jd->extent_list); 579 INIT_LIST_HEAD(&jd->jd_revoke_list); 580 581 INIT_WORK(&jd->jd_work, gfs2_recover_func); 582 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1); 583 if (IS_ERR_OR_NULL(jd->jd_inode)) { 584 if (!jd->jd_inode) 585 error = -ENOENT; 586 else 587 error = PTR_ERR(jd->jd_inode); 588 kfree(jd); 589 break; 590 } 591 592 spin_lock(&sdp->sd_jindex_spin); 593 jd->jd_jid = sdp->sd_journals++; 594 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list); 595 spin_unlock(&sdp->sd_jindex_spin); 596 } 597 598 mutex_unlock(&sdp->sd_jindex_mutex); 599 600 return error; 601 } 602 603 /** 604 * check_journal_clean - Make sure a journal is clean for a spectator mount 605 * @sdp: The GFS2 superblock 606 * @jd: The journal descriptor 607 * 608 * Returns: 0 if the journal is clean or locked, else an error 609 */ 610 static int check_journal_clean(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd) 611 { 612 int error; 613 struct gfs2_holder j_gh; 614 struct gfs2_log_header_host head; 615 struct gfs2_inode *ip; 616 617 ip = GFS2_I(jd->jd_inode); 618 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_NOEXP | 619 GL_EXACT | GL_NOCACHE, &j_gh); 620 if (error) { 621 fs_err(sdp, "Error locking journal for spectator mount.\n"); 622 return -EPERM; 623 } 624 error = gfs2_jdesc_check(jd); 625 if (error) { 626 fs_err(sdp, "Error checking journal for spectator mount.\n"); 627 goto out_unlock; 628 } 629 error = gfs2_find_jhead(jd, &head, false); 630 if (error) { 631 fs_err(sdp, "Error parsing journal for spectator mount.\n"); 632 goto out_unlock; 633 } 634 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) { 635 error = -EPERM; 636 fs_err(sdp, "jid=%u: Journal is dirty, so the first mounter " 637 "must not be a spectator.\n", jd->jd_jid); 638 } 639 640 out_unlock: 641 gfs2_glock_dq_uninit(&j_gh); 642 return error; 643 } 644 645 static int init_journal(struct gfs2_sbd *sdp, int undo) 646 { 647 struct inode *master = d_inode(sdp->sd_master_dir); 648 struct gfs2_holder ji_gh; 649 struct gfs2_inode *ip; 650 int jindex = 1; 651 int error = 0; 652 653 if (undo) { 654 jindex = 0; 655 goto fail_jinode_gh; 656 } 657 658 sdp->sd_jindex = gfs2_lookup_simple(master, "jindex"); 659 if (IS_ERR(sdp->sd_jindex)) { 660 fs_err(sdp, "can't lookup journal index: %d\n", error); 661 return PTR_ERR(sdp->sd_jindex); 662 } 663 664 /* Load in the journal index special file */ 665 666 error = gfs2_jindex_hold(sdp, &ji_gh); 667 if (error) { 668 fs_err(sdp, "can't read journal index: %d\n", error); 669 goto fail; 670 } 671 672 error = -EUSERS; 673 if (!gfs2_jindex_size(sdp)) { 674 fs_err(sdp, "no journals!\n"); 675 goto fail_jindex; 676 } 677 678 atomic_set(&sdp->sd_log_blks_needed, 0); 679 if (sdp->sd_args.ar_spectator) { 680 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0); 681 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks); 682 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5); 683 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5); 684 } else { 685 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) { 686 fs_err(sdp, "can't mount journal #%u\n", 687 sdp->sd_lockstruct.ls_jid); 688 fs_err(sdp, "there are only %u journals (0 - %u)\n", 689 gfs2_jindex_size(sdp), 690 gfs2_jindex_size(sdp) - 1); 691 goto fail_jindex; 692 } 693 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid); 694 695 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid, 696 &gfs2_journal_glops, 697 LM_ST_EXCLUSIVE, LM_FLAG_NOEXP, 698 &sdp->sd_journal_gh); 699 if (error) { 700 fs_err(sdp, "can't acquire journal glock: %d\n", error); 701 goto fail_jindex; 702 } 703 704 ip = GFS2_I(sdp->sd_jdesc->jd_inode); 705 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 706 LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE, 707 &sdp->sd_jinode_gh); 708 if (error) { 709 fs_err(sdp, "can't acquire journal inode glock: %d\n", 710 error); 711 goto fail_journal_gh; 712 } 713 714 error = gfs2_jdesc_check(sdp->sd_jdesc); 715 if (error) { 716 fs_err(sdp, "my journal (%u) is bad: %d\n", 717 sdp->sd_jdesc->jd_jid, error); 718 goto fail_jinode_gh; 719 } 720 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks); 721 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5); 722 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5); 723 724 /* Map the extents for this journal's blocks */ 725 gfs2_map_journal_extents(sdp, sdp->sd_jdesc); 726 } 727 trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free)); 728 729 if (sdp->sd_lockstruct.ls_first) { 730 unsigned int x; 731 for (x = 0; x < sdp->sd_journals; x++) { 732 struct gfs2_jdesc *jd = gfs2_jdesc_find(sdp, x); 733 734 if (sdp->sd_args.ar_spectator) { 735 error = check_journal_clean(sdp, jd); 736 if (error) 737 goto fail_jinode_gh; 738 continue; 739 } 740 error = gfs2_recover_journal(jd, true); 741 if (error) { 742 fs_err(sdp, "error recovering journal %u: %d\n", 743 x, error); 744 goto fail_jinode_gh; 745 } 746 } 747 748 gfs2_others_may_mount(sdp); 749 } else if (!sdp->sd_args.ar_spectator) { 750 error = gfs2_recover_journal(sdp->sd_jdesc, true); 751 if (error) { 752 fs_err(sdp, "error recovering my journal: %d\n", error); 753 goto fail_jinode_gh; 754 } 755 } 756 757 sdp->sd_log_idle = 1; 758 set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags); 759 gfs2_glock_dq_uninit(&ji_gh); 760 jindex = 0; 761 INIT_WORK(&sdp->sd_freeze_work, gfs2_freeze_func); 762 return 0; 763 764 fail_jinode_gh: 765 if (!sdp->sd_args.ar_spectator) 766 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh); 767 fail_journal_gh: 768 if (!sdp->sd_args.ar_spectator) 769 gfs2_glock_dq_uninit(&sdp->sd_journal_gh); 770 fail_jindex: 771 gfs2_jindex_free(sdp); 772 if (jindex) 773 gfs2_glock_dq_uninit(&ji_gh); 774 fail: 775 iput(sdp->sd_jindex); 776 return error; 777 } 778 779 static struct lock_class_key gfs2_quota_imutex_key; 780 781 static int init_inodes(struct gfs2_sbd *sdp, int undo) 782 { 783 int error = 0; 784 struct inode *master = d_inode(sdp->sd_master_dir); 785 786 if (undo) 787 goto fail_qinode; 788 789 error = init_journal(sdp, undo); 790 complete_all(&sdp->sd_journal_ready); 791 if (error) 792 goto fail; 793 794 /* Read in the master statfs inode */ 795 sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs"); 796 if (IS_ERR(sdp->sd_statfs_inode)) { 797 error = PTR_ERR(sdp->sd_statfs_inode); 798 fs_err(sdp, "can't read in statfs inode: %d\n", error); 799 goto fail_journal; 800 } 801 802 /* Read in the resource index inode */ 803 sdp->sd_rindex = gfs2_lookup_simple(master, "rindex"); 804 if (IS_ERR(sdp->sd_rindex)) { 805 error = PTR_ERR(sdp->sd_rindex); 806 fs_err(sdp, "can't get resource index inode: %d\n", error); 807 goto fail_statfs; 808 } 809 sdp->sd_rindex_uptodate = 0; 810 811 /* Read in the quota inode */ 812 sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota"); 813 if (IS_ERR(sdp->sd_quota_inode)) { 814 error = PTR_ERR(sdp->sd_quota_inode); 815 fs_err(sdp, "can't get quota file inode: %d\n", error); 816 goto fail_rindex; 817 } 818 /* 819 * i_rwsem on quota files is special. Since this inode is hidden system 820 * file, we are safe to define locking ourselves. 821 */ 822 lockdep_set_class(&sdp->sd_quota_inode->i_rwsem, 823 &gfs2_quota_imutex_key); 824 825 error = gfs2_rindex_update(sdp); 826 if (error) 827 goto fail_qinode; 828 829 return 0; 830 831 fail_qinode: 832 iput(sdp->sd_quota_inode); 833 fail_rindex: 834 gfs2_clear_rgrpd(sdp); 835 iput(sdp->sd_rindex); 836 fail_statfs: 837 iput(sdp->sd_statfs_inode); 838 fail_journal: 839 init_journal(sdp, UNDO); 840 fail: 841 return error; 842 } 843 844 static int init_per_node(struct gfs2_sbd *sdp, int undo) 845 { 846 struct inode *pn = NULL; 847 char buf[30]; 848 int error = 0; 849 struct gfs2_inode *ip; 850 struct inode *master = d_inode(sdp->sd_master_dir); 851 852 if (sdp->sd_args.ar_spectator) 853 return 0; 854 855 if (undo) 856 goto fail_qc_gh; 857 858 pn = gfs2_lookup_simple(master, "per_node"); 859 if (IS_ERR(pn)) { 860 error = PTR_ERR(pn); 861 fs_err(sdp, "can't find per_node directory: %d\n", error); 862 return error; 863 } 864 865 sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid); 866 sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf); 867 if (IS_ERR(sdp->sd_sc_inode)) { 868 error = PTR_ERR(sdp->sd_sc_inode); 869 fs_err(sdp, "can't find local \"sc\" file: %d\n", error); 870 goto fail; 871 } 872 873 sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid); 874 sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf); 875 if (IS_ERR(sdp->sd_qc_inode)) { 876 error = PTR_ERR(sdp->sd_qc_inode); 877 fs_err(sdp, "can't find local \"qc\" file: %d\n", error); 878 goto fail_ut_i; 879 } 880 881 iput(pn); 882 pn = NULL; 883 884 ip = GFS2_I(sdp->sd_sc_inode); 885 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, 886 &sdp->sd_sc_gh); 887 if (error) { 888 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error); 889 goto fail_qc_i; 890 } 891 892 ip = GFS2_I(sdp->sd_qc_inode); 893 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, 894 &sdp->sd_qc_gh); 895 if (error) { 896 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error); 897 goto fail_ut_gh; 898 } 899 900 return 0; 901 902 fail_qc_gh: 903 gfs2_glock_dq_uninit(&sdp->sd_qc_gh); 904 fail_ut_gh: 905 gfs2_glock_dq_uninit(&sdp->sd_sc_gh); 906 fail_qc_i: 907 iput(sdp->sd_qc_inode); 908 fail_ut_i: 909 iput(sdp->sd_sc_inode); 910 fail: 911 iput(pn); 912 return error; 913 } 914 915 static const match_table_t nolock_tokens = { 916 { Opt_jid, "jid=%d\n", }, 917 { Opt_err, NULL }, 918 }; 919 920 static const struct lm_lockops nolock_ops = { 921 .lm_proto_name = "lock_nolock", 922 .lm_put_lock = gfs2_glock_free, 923 .lm_tokens = &nolock_tokens, 924 }; 925 926 /** 927 * gfs2_lm_mount - mount a locking protocol 928 * @sdp: the filesystem 929 * @args: mount arguments 930 * @silent: if 1, don't complain if the FS isn't a GFS2 fs 931 * 932 * Returns: errno 933 */ 934 935 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent) 936 { 937 const struct lm_lockops *lm; 938 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 939 struct gfs2_args *args = &sdp->sd_args; 940 const char *proto = sdp->sd_proto_name; 941 const char *table = sdp->sd_table_name; 942 char *o, *options; 943 int ret; 944 945 if (!strcmp("lock_nolock", proto)) { 946 lm = &nolock_ops; 947 sdp->sd_args.ar_localflocks = 1; 948 #ifdef CONFIG_GFS2_FS_LOCKING_DLM 949 } else if (!strcmp("lock_dlm", proto)) { 950 lm = &gfs2_dlm_ops; 951 #endif 952 } else { 953 pr_info("can't find protocol %s\n", proto); 954 return -ENOENT; 955 } 956 957 fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table); 958 959 ls->ls_ops = lm; 960 ls->ls_first = 1; 961 962 for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) { 963 substring_t tmp[MAX_OPT_ARGS]; 964 int token, option; 965 966 if (!o || !*o) 967 continue; 968 969 token = match_token(o, *lm->lm_tokens, tmp); 970 switch (token) { 971 case Opt_jid: 972 ret = match_int(&tmp[0], &option); 973 if (ret || option < 0) 974 goto hostdata_error; 975 if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags)) 976 ls->ls_jid = option; 977 break; 978 case Opt_id: 979 case Opt_nodir: 980 /* Obsolete, but left for backward compat purposes */ 981 break; 982 case Opt_first: 983 ret = match_int(&tmp[0], &option); 984 if (ret || (option != 0 && option != 1)) 985 goto hostdata_error; 986 ls->ls_first = option; 987 break; 988 case Opt_err: 989 default: 990 hostdata_error: 991 fs_info(sdp, "unknown hostdata (%s)\n", o); 992 return -EINVAL; 993 } 994 } 995 996 if (lm->lm_mount == NULL) { 997 fs_info(sdp, "Now mounting FS...\n"); 998 complete_all(&sdp->sd_locking_init); 999 return 0; 1000 } 1001 ret = lm->lm_mount(sdp, table); 1002 if (ret == 0) 1003 fs_info(sdp, "Joined cluster. Now mounting FS...\n"); 1004 complete_all(&sdp->sd_locking_init); 1005 return ret; 1006 } 1007 1008 void gfs2_lm_unmount(struct gfs2_sbd *sdp) 1009 { 1010 const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops; 1011 if (likely(!gfs2_withdrawn(sdp)) && lm->lm_unmount) 1012 lm->lm_unmount(sdp); 1013 } 1014 1015 static int wait_on_journal(struct gfs2_sbd *sdp) 1016 { 1017 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL) 1018 return 0; 1019 1020 return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, TASK_INTERRUPTIBLE) 1021 ? -EINTR : 0; 1022 } 1023 1024 void gfs2_online_uevent(struct gfs2_sbd *sdp) 1025 { 1026 struct super_block *sb = sdp->sd_vfs; 1027 char ro[20]; 1028 char spectator[20]; 1029 char *envp[] = { ro, spectator, NULL }; 1030 sprintf(ro, "RDONLY=%d", sb_rdonly(sb)); 1031 sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0); 1032 kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp); 1033 } 1034 1035 /** 1036 * gfs2_fill_super - Read in superblock 1037 * @sb: The VFS superblock 1038 * @args: Mount options 1039 * @silent: Don't complain if it's not a GFS2 filesystem 1040 * 1041 * Returns: -errno 1042 */ 1043 static int gfs2_fill_super(struct super_block *sb, struct fs_context *fc) 1044 { 1045 struct gfs2_args *args = fc->fs_private; 1046 int silent = fc->sb_flags & SB_SILENT; 1047 struct gfs2_sbd *sdp; 1048 struct gfs2_holder mount_gh; 1049 int error; 1050 1051 sdp = init_sbd(sb); 1052 if (!sdp) { 1053 pr_warn("can't alloc struct gfs2_sbd\n"); 1054 return -ENOMEM; 1055 } 1056 sdp->sd_args = *args; 1057 1058 if (sdp->sd_args.ar_spectator) { 1059 sb->s_flags |= SB_RDONLY; 1060 set_bit(SDF_RORECOVERY, &sdp->sd_flags); 1061 } 1062 if (sdp->sd_args.ar_posix_acl) 1063 sb->s_flags |= SB_POSIXACL; 1064 if (sdp->sd_args.ar_nobarrier) 1065 set_bit(SDF_NOBARRIERS, &sdp->sd_flags); 1066 1067 sb->s_flags |= SB_NOSEC; 1068 sb->s_magic = GFS2_MAGIC; 1069 sb->s_op = &gfs2_super_ops; 1070 sb->s_d_op = &gfs2_dops; 1071 sb->s_export_op = &gfs2_export_ops; 1072 sb->s_xattr = gfs2_xattr_handlers; 1073 sb->s_qcop = &gfs2_quotactl_ops; 1074 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; 1075 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE; 1076 sb->s_time_gran = 1; 1077 sb->s_maxbytes = MAX_LFS_FILESIZE; 1078 1079 /* Set up the buffer cache and fill in some fake block size values 1080 to allow us to read-in the on-disk superblock. */ 1081 sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK); 1082 sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits; 1083 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift - 1084 GFS2_BASIC_BLOCK_SHIFT; 1085 sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift); 1086 1087 sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit; 1088 sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum; 1089 if (sdp->sd_args.ar_statfs_quantum) { 1090 sdp->sd_tune.gt_statfs_slow = 0; 1091 sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum; 1092 } else { 1093 sdp->sd_tune.gt_statfs_slow = 1; 1094 sdp->sd_tune.gt_statfs_quantum = 30; 1095 } 1096 1097 error = init_names(sdp, silent); 1098 if (error) { 1099 /* In this case, we haven't initialized sysfs, so we have to 1100 manually free the sdp. */ 1101 free_sbd(sdp); 1102 sb->s_fs_info = NULL; 1103 return error; 1104 } 1105 1106 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s", sdp->sd_table_name); 1107 1108 error = gfs2_sys_fs_add(sdp); 1109 /* 1110 * If we hit an error here, gfs2_sys_fs_add will have called function 1111 * kobject_put which causes the sysfs usage count to go to zero, which 1112 * causes sysfs to call function gfs2_sbd_release, which frees sdp. 1113 * Subsequent error paths here will call gfs2_sys_fs_del, which also 1114 * kobject_put to free sdp. 1115 */ 1116 if (error) 1117 return error; 1118 1119 gfs2_create_debugfs_file(sdp); 1120 1121 error = gfs2_lm_mount(sdp, silent); 1122 if (error) 1123 goto fail_debug; 1124 1125 error = init_locking(sdp, &mount_gh, DO); 1126 if (error) 1127 goto fail_lm; 1128 1129 error = init_sb(sdp, silent); 1130 if (error) 1131 goto fail_locking; 1132 1133 error = wait_on_journal(sdp); 1134 if (error) 1135 goto fail_sb; 1136 1137 /* 1138 * If user space has failed to join the cluster or some similar 1139 * failure has occurred, then the journal id will contain a 1140 * negative (error) number. This will then be returned to the 1141 * caller (of the mount syscall). We do this even for spectator 1142 * mounts (which just write a jid of 0 to indicate "ok" even though 1143 * the jid is unused in the spectator case) 1144 */ 1145 if (sdp->sd_lockstruct.ls_jid < 0) { 1146 error = sdp->sd_lockstruct.ls_jid; 1147 sdp->sd_lockstruct.ls_jid = 0; 1148 goto fail_sb; 1149 } 1150 1151 if (sdp->sd_args.ar_spectator) 1152 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.s", 1153 sdp->sd_table_name); 1154 else 1155 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.%u", 1156 sdp->sd_table_name, sdp->sd_lockstruct.ls_jid); 1157 1158 error = init_inodes(sdp, DO); 1159 if (error) 1160 goto fail_sb; 1161 1162 error = init_per_node(sdp, DO); 1163 if (error) 1164 goto fail_inodes; 1165 1166 error = gfs2_statfs_init(sdp); 1167 if (error) { 1168 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error); 1169 goto fail_per_node; 1170 } 1171 1172 if (!sb_rdonly(sb)) { 1173 error = gfs2_make_fs_rw(sdp); 1174 if (error) { 1175 fs_err(sdp, "can't make FS RW: %d\n", error); 1176 goto fail_per_node; 1177 } 1178 } 1179 1180 gfs2_glock_dq_uninit(&mount_gh); 1181 gfs2_online_uevent(sdp); 1182 return 0; 1183 1184 fail_per_node: 1185 init_per_node(sdp, UNDO); 1186 fail_inodes: 1187 init_inodes(sdp, UNDO); 1188 fail_sb: 1189 if (sdp->sd_root_dir) 1190 dput(sdp->sd_root_dir); 1191 if (sdp->sd_master_dir) 1192 dput(sdp->sd_master_dir); 1193 if (sb->s_root) 1194 dput(sb->s_root); 1195 sb->s_root = NULL; 1196 fail_locking: 1197 init_locking(sdp, &mount_gh, UNDO); 1198 fail_lm: 1199 complete_all(&sdp->sd_journal_ready); 1200 gfs2_gl_hash_clear(sdp); 1201 gfs2_lm_unmount(sdp); 1202 fail_debug: 1203 gfs2_delete_debugfs_file(sdp); 1204 /* gfs2_sys_fs_del must be the last thing we do, since it causes 1205 * sysfs to call function gfs2_sbd_release, which frees sdp. */ 1206 gfs2_sys_fs_del(sdp); 1207 sb->s_fs_info = NULL; 1208 return error; 1209 } 1210 1211 /** 1212 * gfs2_get_tree - Get the GFS2 superblock and root directory 1213 * @fc: The filesystem context 1214 * 1215 * Returns: 0 or -errno on error 1216 */ 1217 static int gfs2_get_tree(struct fs_context *fc) 1218 { 1219 struct gfs2_args *args = fc->fs_private; 1220 struct gfs2_sbd *sdp; 1221 int error; 1222 1223 error = get_tree_bdev(fc, gfs2_fill_super); 1224 if (error) 1225 return error; 1226 1227 sdp = fc->root->d_sb->s_fs_info; 1228 dput(fc->root); 1229 if (args->ar_meta) 1230 fc->root = dget(sdp->sd_master_dir); 1231 else 1232 fc->root = dget(sdp->sd_root_dir); 1233 return 0; 1234 } 1235 1236 static void gfs2_fc_free(struct fs_context *fc) 1237 { 1238 struct gfs2_args *args = fc->fs_private; 1239 1240 kfree(args); 1241 } 1242 1243 enum gfs2_param { 1244 Opt_lockproto, 1245 Opt_locktable, 1246 Opt_hostdata, 1247 Opt_spectator, 1248 Opt_ignore_local_fs, 1249 Opt_localflocks, 1250 Opt_localcaching, 1251 Opt_debug, 1252 Opt_upgrade, 1253 Opt_acl, 1254 Opt_quota, 1255 Opt_quota_flag, 1256 Opt_suiddir, 1257 Opt_data, 1258 Opt_meta, 1259 Opt_discard, 1260 Opt_commit, 1261 Opt_errors, 1262 Opt_statfs_quantum, 1263 Opt_statfs_percent, 1264 Opt_quota_quantum, 1265 Opt_barrier, 1266 Opt_rgrplvb, 1267 Opt_loccookie, 1268 }; 1269 1270 static const struct constant_table gfs2_param_quota[] = { 1271 {"off", GFS2_QUOTA_OFF}, 1272 {"account", GFS2_QUOTA_ACCOUNT}, 1273 {"on", GFS2_QUOTA_ON}, 1274 {} 1275 }; 1276 1277 enum opt_data { 1278 Opt_data_writeback = GFS2_DATA_WRITEBACK, 1279 Opt_data_ordered = GFS2_DATA_ORDERED, 1280 }; 1281 1282 static const struct constant_table gfs2_param_data[] = { 1283 {"writeback", Opt_data_writeback }, 1284 {"ordered", Opt_data_ordered }, 1285 {} 1286 }; 1287 1288 enum opt_errors { 1289 Opt_errors_withdraw = GFS2_ERRORS_WITHDRAW, 1290 Opt_errors_panic = GFS2_ERRORS_PANIC, 1291 }; 1292 1293 static const struct constant_table gfs2_param_errors[] = { 1294 {"withdraw", Opt_errors_withdraw }, 1295 {"panic", Opt_errors_panic }, 1296 {} 1297 }; 1298 1299 static const struct fs_parameter_spec gfs2_fs_parameters[] = { 1300 fsparam_string ("lockproto", Opt_lockproto), 1301 fsparam_string ("locktable", Opt_locktable), 1302 fsparam_string ("hostdata", Opt_hostdata), 1303 fsparam_flag ("spectator", Opt_spectator), 1304 fsparam_flag ("norecovery", Opt_spectator), 1305 fsparam_flag ("ignore_local_fs", Opt_ignore_local_fs), 1306 fsparam_flag ("localflocks", Opt_localflocks), 1307 fsparam_flag ("localcaching", Opt_localcaching), 1308 fsparam_flag_no("debug", Opt_debug), 1309 fsparam_flag ("upgrade", Opt_upgrade), 1310 fsparam_flag_no("acl", Opt_acl), 1311 fsparam_flag_no("suiddir", Opt_suiddir), 1312 fsparam_enum ("data", Opt_data, gfs2_param_data), 1313 fsparam_flag ("meta", Opt_meta), 1314 fsparam_flag_no("discard", Opt_discard), 1315 fsparam_s32 ("commit", Opt_commit), 1316 fsparam_enum ("errors", Opt_errors, gfs2_param_errors), 1317 fsparam_s32 ("statfs_quantum", Opt_statfs_quantum), 1318 fsparam_s32 ("statfs_percent", Opt_statfs_percent), 1319 fsparam_s32 ("quota_quantum", Opt_quota_quantum), 1320 fsparam_flag_no("barrier", Opt_barrier), 1321 fsparam_flag_no("rgrplvb", Opt_rgrplvb), 1322 fsparam_flag_no("loccookie", Opt_loccookie), 1323 /* quota can be a flag or an enum so it gets special treatment */ 1324 fsparam_flag_no("quota", Opt_quota_flag), 1325 fsparam_enum("quota", Opt_quota, gfs2_param_quota), 1326 {} 1327 }; 1328 1329 /* Parse a single mount parameter */ 1330 static int gfs2_parse_param(struct fs_context *fc, struct fs_parameter *param) 1331 { 1332 struct gfs2_args *args = fc->fs_private; 1333 struct fs_parse_result result; 1334 int o; 1335 1336 o = fs_parse(fc, gfs2_fs_parameters, param, &result); 1337 if (o < 0) 1338 return o; 1339 1340 switch (o) { 1341 case Opt_lockproto: 1342 strlcpy(args->ar_lockproto, param->string, GFS2_LOCKNAME_LEN); 1343 break; 1344 case Opt_locktable: 1345 strlcpy(args->ar_locktable, param->string, GFS2_LOCKNAME_LEN); 1346 break; 1347 case Opt_hostdata: 1348 strlcpy(args->ar_hostdata, param->string, GFS2_LOCKNAME_LEN); 1349 break; 1350 case Opt_spectator: 1351 args->ar_spectator = 1; 1352 break; 1353 case Opt_ignore_local_fs: 1354 /* Retained for backwards compat only */ 1355 break; 1356 case Opt_localflocks: 1357 args->ar_localflocks = 1; 1358 break; 1359 case Opt_localcaching: 1360 /* Retained for backwards compat only */ 1361 break; 1362 case Opt_debug: 1363 if (result.boolean && args->ar_errors == GFS2_ERRORS_PANIC) 1364 return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive"); 1365 args->ar_debug = result.boolean; 1366 break; 1367 case Opt_upgrade: 1368 /* Retained for backwards compat only */ 1369 break; 1370 case Opt_acl: 1371 args->ar_posix_acl = result.boolean; 1372 break; 1373 case Opt_quota_flag: 1374 args->ar_quota = result.negated ? GFS2_QUOTA_OFF : GFS2_QUOTA_ON; 1375 break; 1376 case Opt_quota: 1377 args->ar_quota = result.int_32; 1378 break; 1379 case Opt_suiddir: 1380 args->ar_suiddir = result.boolean; 1381 break; 1382 case Opt_data: 1383 /* The uint_32 result maps directly to GFS2_DATA_* */ 1384 args->ar_data = result.uint_32; 1385 break; 1386 case Opt_meta: 1387 args->ar_meta = 1; 1388 break; 1389 case Opt_discard: 1390 args->ar_discard = result.boolean; 1391 break; 1392 case Opt_commit: 1393 if (result.int_32 <= 0) 1394 return invalfc(fc, "commit mount option requires a positive numeric argument"); 1395 args->ar_commit = result.int_32; 1396 break; 1397 case Opt_statfs_quantum: 1398 if (result.int_32 < 0) 1399 return invalfc(fc, "statfs_quantum mount option requires a non-negative numeric argument"); 1400 args->ar_statfs_quantum = result.int_32; 1401 break; 1402 case Opt_quota_quantum: 1403 if (result.int_32 <= 0) 1404 return invalfc(fc, "quota_quantum mount option requires a positive numeric argument"); 1405 args->ar_quota_quantum = result.int_32; 1406 break; 1407 case Opt_statfs_percent: 1408 if (result.int_32 < 0 || result.int_32 > 100) 1409 return invalfc(fc, "statfs_percent mount option requires a numeric argument between 0 and 100"); 1410 args->ar_statfs_percent = result.int_32; 1411 break; 1412 case Opt_errors: 1413 if (args->ar_debug && result.uint_32 == GFS2_ERRORS_PANIC) 1414 return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive"); 1415 args->ar_errors = result.uint_32; 1416 break; 1417 case Opt_barrier: 1418 args->ar_nobarrier = result.boolean; 1419 break; 1420 case Opt_rgrplvb: 1421 args->ar_rgrplvb = result.boolean; 1422 break; 1423 case Opt_loccookie: 1424 args->ar_loccookie = result.boolean; 1425 break; 1426 default: 1427 return invalfc(fc, "invalid mount option: %s", param->key); 1428 } 1429 return 0; 1430 } 1431 1432 static int gfs2_reconfigure(struct fs_context *fc) 1433 { 1434 struct super_block *sb = fc->root->d_sb; 1435 struct gfs2_sbd *sdp = sb->s_fs_info; 1436 struct gfs2_args *oldargs = &sdp->sd_args; 1437 struct gfs2_args *newargs = fc->fs_private; 1438 struct gfs2_tune *gt = &sdp->sd_tune; 1439 int error = 0; 1440 1441 sync_filesystem(sb); 1442 1443 spin_lock(>->gt_spin); 1444 oldargs->ar_commit = gt->gt_logd_secs; 1445 oldargs->ar_quota_quantum = gt->gt_quota_quantum; 1446 if (gt->gt_statfs_slow) 1447 oldargs->ar_statfs_quantum = 0; 1448 else 1449 oldargs->ar_statfs_quantum = gt->gt_statfs_quantum; 1450 spin_unlock(>->gt_spin); 1451 1452 if (strcmp(newargs->ar_lockproto, oldargs->ar_lockproto)) { 1453 errorfc(fc, "reconfiguration of locking protocol not allowed"); 1454 return -EINVAL; 1455 } 1456 if (strcmp(newargs->ar_locktable, oldargs->ar_locktable)) { 1457 errorfc(fc, "reconfiguration of lock table not allowed"); 1458 return -EINVAL; 1459 } 1460 if (strcmp(newargs->ar_hostdata, oldargs->ar_hostdata)) { 1461 errorfc(fc, "reconfiguration of host data not allowed"); 1462 return -EINVAL; 1463 } 1464 if (newargs->ar_spectator != oldargs->ar_spectator) { 1465 errorfc(fc, "reconfiguration of spectator mode not allowed"); 1466 return -EINVAL; 1467 } 1468 if (newargs->ar_localflocks != oldargs->ar_localflocks) { 1469 errorfc(fc, "reconfiguration of localflocks not allowed"); 1470 return -EINVAL; 1471 } 1472 if (newargs->ar_meta != oldargs->ar_meta) { 1473 errorfc(fc, "switching between gfs2 and gfs2meta not allowed"); 1474 return -EINVAL; 1475 } 1476 if (oldargs->ar_spectator) 1477 fc->sb_flags |= SB_RDONLY; 1478 1479 if ((sb->s_flags ^ fc->sb_flags) & SB_RDONLY) { 1480 if (fc->sb_flags & SB_RDONLY) { 1481 error = gfs2_make_fs_ro(sdp); 1482 if (error) 1483 errorfc(fc, "unable to remount read-only"); 1484 } else { 1485 error = gfs2_make_fs_rw(sdp); 1486 if (error) 1487 errorfc(fc, "unable to remount read-write"); 1488 } 1489 } 1490 sdp->sd_args = *newargs; 1491 1492 if (sdp->sd_args.ar_posix_acl) 1493 sb->s_flags |= SB_POSIXACL; 1494 else 1495 sb->s_flags &= ~SB_POSIXACL; 1496 if (sdp->sd_args.ar_nobarrier) 1497 set_bit(SDF_NOBARRIERS, &sdp->sd_flags); 1498 else 1499 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags); 1500 spin_lock(>->gt_spin); 1501 gt->gt_logd_secs = newargs->ar_commit; 1502 gt->gt_quota_quantum = newargs->ar_quota_quantum; 1503 if (newargs->ar_statfs_quantum) { 1504 gt->gt_statfs_slow = 0; 1505 gt->gt_statfs_quantum = newargs->ar_statfs_quantum; 1506 } 1507 else { 1508 gt->gt_statfs_slow = 1; 1509 gt->gt_statfs_quantum = 30; 1510 } 1511 spin_unlock(>->gt_spin); 1512 1513 gfs2_online_uevent(sdp); 1514 return error; 1515 } 1516 1517 static const struct fs_context_operations gfs2_context_ops = { 1518 .free = gfs2_fc_free, 1519 .parse_param = gfs2_parse_param, 1520 .get_tree = gfs2_get_tree, 1521 .reconfigure = gfs2_reconfigure, 1522 }; 1523 1524 /* Set up the filesystem mount context */ 1525 static int gfs2_init_fs_context(struct fs_context *fc) 1526 { 1527 struct gfs2_args *args; 1528 1529 args = kmalloc(sizeof(*args), GFP_KERNEL); 1530 if (args == NULL) 1531 return -ENOMEM; 1532 1533 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) { 1534 struct gfs2_sbd *sdp = fc->root->d_sb->s_fs_info; 1535 1536 *args = sdp->sd_args; 1537 } else { 1538 memset(args, 0, sizeof(*args)); 1539 args->ar_quota = GFS2_QUOTA_DEFAULT; 1540 args->ar_data = GFS2_DATA_DEFAULT; 1541 args->ar_commit = 30; 1542 args->ar_statfs_quantum = 30; 1543 args->ar_quota_quantum = 60; 1544 args->ar_errors = GFS2_ERRORS_DEFAULT; 1545 } 1546 fc->fs_private = args; 1547 fc->ops = &gfs2_context_ops; 1548 return 0; 1549 } 1550 1551 static int set_meta_super(struct super_block *s, struct fs_context *fc) 1552 { 1553 return -EINVAL; 1554 } 1555 1556 static int test_meta_super(struct super_block *s, struct fs_context *fc) 1557 { 1558 return (fc->sget_key == s->s_bdev); 1559 } 1560 1561 static int gfs2_meta_get_tree(struct fs_context *fc) 1562 { 1563 struct super_block *s; 1564 struct gfs2_sbd *sdp; 1565 struct path path; 1566 int error; 1567 1568 if (!fc->source || !*fc->source) 1569 return -EINVAL; 1570 1571 error = kern_path(fc->source, LOOKUP_FOLLOW, &path); 1572 if (error) { 1573 pr_warn("path_lookup on %s returned error %d\n", 1574 fc->source, error); 1575 return error; 1576 } 1577 fc->fs_type = &gfs2_fs_type; 1578 fc->sget_key = path.dentry->d_sb->s_bdev; 1579 s = sget_fc(fc, test_meta_super, set_meta_super); 1580 path_put(&path); 1581 if (IS_ERR(s)) { 1582 pr_warn("gfs2 mount does not exist\n"); 1583 return PTR_ERR(s); 1584 } 1585 if ((fc->sb_flags ^ s->s_flags) & SB_RDONLY) { 1586 deactivate_locked_super(s); 1587 return -EBUSY; 1588 } 1589 sdp = s->s_fs_info; 1590 fc->root = dget(sdp->sd_master_dir); 1591 return 0; 1592 } 1593 1594 static const struct fs_context_operations gfs2_meta_context_ops = { 1595 .free = gfs2_fc_free, 1596 .get_tree = gfs2_meta_get_tree, 1597 }; 1598 1599 static int gfs2_meta_init_fs_context(struct fs_context *fc) 1600 { 1601 int ret = gfs2_init_fs_context(fc); 1602 1603 if (ret) 1604 return ret; 1605 1606 fc->ops = &gfs2_meta_context_ops; 1607 return 0; 1608 } 1609 1610 static void gfs2_kill_sb(struct super_block *sb) 1611 { 1612 struct gfs2_sbd *sdp = sb->s_fs_info; 1613 1614 if (sdp == NULL) { 1615 kill_block_super(sb); 1616 return; 1617 } 1618 1619 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SYNC | GFS2_LFC_KILL_SB); 1620 dput(sdp->sd_root_dir); 1621 dput(sdp->sd_master_dir); 1622 sdp->sd_root_dir = NULL; 1623 sdp->sd_master_dir = NULL; 1624 shrink_dcache_sb(sb); 1625 kill_block_super(sb); 1626 } 1627 1628 struct file_system_type gfs2_fs_type = { 1629 .name = "gfs2", 1630 .fs_flags = FS_REQUIRES_DEV, 1631 .init_fs_context = gfs2_init_fs_context, 1632 .parameters = gfs2_fs_parameters, 1633 .kill_sb = gfs2_kill_sb, 1634 .owner = THIS_MODULE, 1635 }; 1636 MODULE_ALIAS_FS("gfs2"); 1637 1638 struct file_system_type gfs2meta_fs_type = { 1639 .name = "gfs2meta", 1640 .fs_flags = FS_REQUIRES_DEV, 1641 .init_fs_context = gfs2_meta_init_fs_context, 1642 .owner = THIS_MODULE, 1643 }; 1644 MODULE_ALIAS_FS("gfs2meta"); 1645