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 struct gfs2_inode *jip; 556 557 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh); 558 if (error) 559 break; 560 561 name.len = sprintf(buf, "journal%u", sdp->sd_journals); 562 name.hash = gfs2_disk_hash(name.name, name.len); 563 564 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL); 565 if (error == -ENOENT) { 566 error = 0; 567 break; 568 } 569 570 gfs2_glock_dq_uninit(ji_gh); 571 572 if (error) 573 break; 574 575 error = -ENOMEM; 576 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL); 577 if (!jd) 578 break; 579 580 INIT_LIST_HEAD(&jd->extent_list); 581 INIT_LIST_HEAD(&jd->jd_revoke_list); 582 583 INIT_WORK(&jd->jd_work, gfs2_recover_func); 584 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1); 585 if (IS_ERR_OR_NULL(jd->jd_inode)) { 586 if (!jd->jd_inode) 587 error = -ENOENT; 588 else 589 error = PTR_ERR(jd->jd_inode); 590 kfree(jd); 591 break; 592 } 593 594 spin_lock(&sdp->sd_jindex_spin); 595 jd->jd_jid = sdp->sd_journals++; 596 jip = GFS2_I(jd->jd_inode); 597 jd->jd_no_addr = jip->i_no_addr; 598 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list); 599 spin_unlock(&sdp->sd_jindex_spin); 600 } 601 602 mutex_unlock(&sdp->sd_jindex_mutex); 603 604 return error; 605 } 606 607 static int init_journal(struct gfs2_sbd *sdp, int undo) 608 { 609 struct inode *master = d_inode(sdp->sd_master_dir); 610 struct gfs2_holder ji_gh; 611 struct gfs2_inode *ip; 612 int jindex = 1; 613 int error = 0; 614 615 if (undo) { 616 jindex = 0; 617 goto fail_jinode_gh; 618 } 619 620 sdp->sd_jindex = gfs2_lookup_simple(master, "jindex"); 621 if (IS_ERR(sdp->sd_jindex)) { 622 fs_err(sdp, "can't lookup journal index: %d\n", error); 623 return PTR_ERR(sdp->sd_jindex); 624 } 625 626 /* Load in the journal index special file */ 627 628 error = gfs2_jindex_hold(sdp, &ji_gh); 629 if (error) { 630 fs_err(sdp, "can't read journal index: %d\n", error); 631 goto fail; 632 } 633 634 error = -EUSERS; 635 if (!gfs2_jindex_size(sdp)) { 636 fs_err(sdp, "no journals!\n"); 637 goto fail_jindex; 638 } 639 640 atomic_set(&sdp->sd_log_blks_needed, 0); 641 if (sdp->sd_args.ar_spectator) { 642 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0); 643 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks); 644 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5); 645 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5); 646 } else { 647 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) { 648 fs_err(sdp, "can't mount journal #%u\n", 649 sdp->sd_lockstruct.ls_jid); 650 fs_err(sdp, "there are only %u journals (0 - %u)\n", 651 gfs2_jindex_size(sdp), 652 gfs2_jindex_size(sdp) - 1); 653 goto fail_jindex; 654 } 655 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid); 656 657 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid, 658 &gfs2_journal_glops, 659 LM_ST_EXCLUSIVE, 660 LM_FLAG_NOEXP | GL_NOCACHE, 661 &sdp->sd_journal_gh); 662 if (error) { 663 fs_err(sdp, "can't acquire journal glock: %d\n", error); 664 goto fail_jindex; 665 } 666 667 ip = GFS2_I(sdp->sd_jdesc->jd_inode); 668 sdp->sd_jinode_gl = ip->i_gl; 669 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 670 LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE, 671 &sdp->sd_jinode_gh); 672 if (error) { 673 fs_err(sdp, "can't acquire journal inode glock: %d\n", 674 error); 675 goto fail_journal_gh; 676 } 677 678 error = gfs2_jdesc_check(sdp->sd_jdesc); 679 if (error) { 680 fs_err(sdp, "my journal (%u) is bad: %d\n", 681 sdp->sd_jdesc->jd_jid, error); 682 goto fail_jinode_gh; 683 } 684 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks); 685 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5); 686 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5); 687 688 /* Map the extents for this journal's blocks */ 689 gfs2_map_journal_extents(sdp, sdp->sd_jdesc); 690 } 691 trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free)); 692 693 if (sdp->sd_lockstruct.ls_first) { 694 unsigned int x; 695 for (x = 0; x < sdp->sd_journals; x++) { 696 struct gfs2_jdesc *jd = gfs2_jdesc_find(sdp, x); 697 698 if (sdp->sd_args.ar_spectator) { 699 error = check_journal_clean(sdp, jd, true); 700 if (error) 701 goto fail_jinode_gh; 702 continue; 703 } 704 error = gfs2_recover_journal(jd, true); 705 if (error) { 706 fs_err(sdp, "error recovering journal %u: %d\n", 707 x, error); 708 goto fail_jinode_gh; 709 } 710 } 711 712 gfs2_others_may_mount(sdp); 713 } else if (!sdp->sd_args.ar_spectator) { 714 error = gfs2_recover_journal(sdp->sd_jdesc, true); 715 if (error) { 716 fs_err(sdp, "error recovering my journal: %d\n", error); 717 goto fail_jinode_gh; 718 } 719 } 720 721 sdp->sd_log_idle = 1; 722 set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags); 723 gfs2_glock_dq_uninit(&ji_gh); 724 jindex = 0; 725 INIT_WORK(&sdp->sd_freeze_work, gfs2_freeze_func); 726 return 0; 727 728 fail_jinode_gh: 729 /* A withdraw may have done dq/uninit so now we need to check it */ 730 if (!sdp->sd_args.ar_spectator && 731 gfs2_holder_initialized(&sdp->sd_jinode_gh)) 732 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh); 733 fail_journal_gh: 734 if (!sdp->sd_args.ar_spectator && 735 gfs2_holder_initialized(&sdp->sd_journal_gh)) 736 gfs2_glock_dq_uninit(&sdp->sd_journal_gh); 737 fail_jindex: 738 gfs2_jindex_free(sdp); 739 if (jindex) 740 gfs2_glock_dq_uninit(&ji_gh); 741 fail: 742 iput(sdp->sd_jindex); 743 return error; 744 } 745 746 static struct lock_class_key gfs2_quota_imutex_key; 747 748 static int init_inodes(struct gfs2_sbd *sdp, int undo) 749 { 750 int error = 0; 751 struct inode *master = d_inode(sdp->sd_master_dir); 752 753 if (undo) 754 goto fail_qinode; 755 756 error = init_journal(sdp, undo); 757 complete_all(&sdp->sd_journal_ready); 758 if (error) 759 goto fail; 760 761 /* Read in the master statfs inode */ 762 sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs"); 763 if (IS_ERR(sdp->sd_statfs_inode)) { 764 error = PTR_ERR(sdp->sd_statfs_inode); 765 fs_err(sdp, "can't read in statfs inode: %d\n", error); 766 goto fail_journal; 767 } 768 769 /* Read in the resource index inode */ 770 sdp->sd_rindex = gfs2_lookup_simple(master, "rindex"); 771 if (IS_ERR(sdp->sd_rindex)) { 772 error = PTR_ERR(sdp->sd_rindex); 773 fs_err(sdp, "can't get resource index inode: %d\n", error); 774 goto fail_statfs; 775 } 776 sdp->sd_rindex_uptodate = 0; 777 778 /* Read in the quota inode */ 779 sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota"); 780 if (IS_ERR(sdp->sd_quota_inode)) { 781 error = PTR_ERR(sdp->sd_quota_inode); 782 fs_err(sdp, "can't get quota file inode: %d\n", error); 783 goto fail_rindex; 784 } 785 /* 786 * i_rwsem on quota files is special. Since this inode is hidden system 787 * file, we are safe to define locking ourselves. 788 */ 789 lockdep_set_class(&sdp->sd_quota_inode->i_rwsem, 790 &gfs2_quota_imutex_key); 791 792 error = gfs2_rindex_update(sdp); 793 if (error) 794 goto fail_qinode; 795 796 return 0; 797 798 fail_qinode: 799 iput(sdp->sd_quota_inode); 800 fail_rindex: 801 gfs2_clear_rgrpd(sdp); 802 iput(sdp->sd_rindex); 803 fail_statfs: 804 iput(sdp->sd_statfs_inode); 805 fail_journal: 806 init_journal(sdp, UNDO); 807 fail: 808 return error; 809 } 810 811 static int init_per_node(struct gfs2_sbd *sdp, int undo) 812 { 813 struct inode *pn = NULL; 814 char buf[30]; 815 int error = 0; 816 struct gfs2_inode *ip; 817 struct inode *master = d_inode(sdp->sd_master_dir); 818 819 if (sdp->sd_args.ar_spectator) 820 return 0; 821 822 if (undo) 823 goto fail_qc_gh; 824 825 pn = gfs2_lookup_simple(master, "per_node"); 826 if (IS_ERR(pn)) { 827 error = PTR_ERR(pn); 828 fs_err(sdp, "can't find per_node directory: %d\n", error); 829 return error; 830 } 831 832 sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid); 833 sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf); 834 if (IS_ERR(sdp->sd_sc_inode)) { 835 error = PTR_ERR(sdp->sd_sc_inode); 836 fs_err(sdp, "can't find local \"sc\" file: %d\n", error); 837 goto fail; 838 } 839 840 sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid); 841 sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf); 842 if (IS_ERR(sdp->sd_qc_inode)) { 843 error = PTR_ERR(sdp->sd_qc_inode); 844 fs_err(sdp, "can't find local \"qc\" file: %d\n", error); 845 goto fail_ut_i; 846 } 847 848 iput(pn); 849 pn = NULL; 850 851 ip = GFS2_I(sdp->sd_sc_inode); 852 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, 853 &sdp->sd_sc_gh); 854 if (error) { 855 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error); 856 goto fail_qc_i; 857 } 858 859 ip = GFS2_I(sdp->sd_qc_inode); 860 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, 861 &sdp->sd_qc_gh); 862 if (error) { 863 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error); 864 goto fail_ut_gh; 865 } 866 867 return 0; 868 869 fail_qc_gh: 870 gfs2_glock_dq_uninit(&sdp->sd_qc_gh); 871 fail_ut_gh: 872 gfs2_glock_dq_uninit(&sdp->sd_sc_gh); 873 fail_qc_i: 874 iput(sdp->sd_qc_inode); 875 fail_ut_i: 876 iput(sdp->sd_sc_inode); 877 fail: 878 iput(pn); 879 return error; 880 } 881 882 static const match_table_t nolock_tokens = { 883 { Opt_jid, "jid=%d", }, 884 { Opt_err, NULL }, 885 }; 886 887 static const struct lm_lockops nolock_ops = { 888 .lm_proto_name = "lock_nolock", 889 .lm_put_lock = gfs2_glock_free, 890 .lm_tokens = &nolock_tokens, 891 }; 892 893 /** 894 * gfs2_lm_mount - mount a locking protocol 895 * @sdp: the filesystem 896 * @args: mount arguments 897 * @silent: if 1, don't complain if the FS isn't a GFS2 fs 898 * 899 * Returns: errno 900 */ 901 902 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent) 903 { 904 const struct lm_lockops *lm; 905 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 906 struct gfs2_args *args = &sdp->sd_args; 907 const char *proto = sdp->sd_proto_name; 908 const char *table = sdp->sd_table_name; 909 char *o, *options; 910 int ret; 911 912 if (!strcmp("lock_nolock", proto)) { 913 lm = &nolock_ops; 914 sdp->sd_args.ar_localflocks = 1; 915 #ifdef CONFIG_GFS2_FS_LOCKING_DLM 916 } else if (!strcmp("lock_dlm", proto)) { 917 lm = &gfs2_dlm_ops; 918 #endif 919 } else { 920 pr_info("can't find protocol %s\n", proto); 921 return -ENOENT; 922 } 923 924 fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table); 925 926 ls->ls_ops = lm; 927 ls->ls_first = 1; 928 929 for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) { 930 substring_t tmp[MAX_OPT_ARGS]; 931 int token, option; 932 933 if (!o || !*o) 934 continue; 935 936 token = match_token(o, *lm->lm_tokens, tmp); 937 switch (token) { 938 case Opt_jid: 939 ret = match_int(&tmp[0], &option); 940 if (ret || option < 0) 941 goto hostdata_error; 942 if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags)) 943 ls->ls_jid = option; 944 break; 945 case Opt_id: 946 case Opt_nodir: 947 /* Obsolete, but left for backward compat purposes */ 948 break; 949 case Opt_first: 950 ret = match_int(&tmp[0], &option); 951 if (ret || (option != 0 && option != 1)) 952 goto hostdata_error; 953 ls->ls_first = option; 954 break; 955 case Opt_err: 956 default: 957 hostdata_error: 958 fs_info(sdp, "unknown hostdata (%s)\n", o); 959 return -EINVAL; 960 } 961 } 962 963 if (lm->lm_mount == NULL) { 964 fs_info(sdp, "Now mounting FS...\n"); 965 complete_all(&sdp->sd_locking_init); 966 return 0; 967 } 968 ret = lm->lm_mount(sdp, table); 969 if (ret == 0) 970 fs_info(sdp, "Joined cluster. Now mounting FS...\n"); 971 complete_all(&sdp->sd_locking_init); 972 return ret; 973 } 974 975 void gfs2_lm_unmount(struct gfs2_sbd *sdp) 976 { 977 const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops; 978 if (likely(!gfs2_withdrawn(sdp)) && lm->lm_unmount) 979 lm->lm_unmount(sdp); 980 } 981 982 static int wait_on_journal(struct gfs2_sbd *sdp) 983 { 984 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL) 985 return 0; 986 987 return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, TASK_INTERRUPTIBLE) 988 ? -EINTR : 0; 989 } 990 991 void gfs2_online_uevent(struct gfs2_sbd *sdp) 992 { 993 struct super_block *sb = sdp->sd_vfs; 994 char ro[20]; 995 char spectator[20]; 996 char *envp[] = { ro, spectator, NULL }; 997 sprintf(ro, "RDONLY=%d", sb_rdonly(sb)); 998 sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0); 999 kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp); 1000 } 1001 1002 /** 1003 * gfs2_fill_super - Read in superblock 1004 * @sb: The VFS superblock 1005 * @args: Mount options 1006 * @silent: Don't complain if it's not a GFS2 filesystem 1007 * 1008 * Returns: -errno 1009 */ 1010 static int gfs2_fill_super(struct super_block *sb, struct fs_context *fc) 1011 { 1012 struct gfs2_args *args = fc->fs_private; 1013 int silent = fc->sb_flags & SB_SILENT; 1014 struct gfs2_sbd *sdp; 1015 struct gfs2_holder mount_gh; 1016 int error; 1017 1018 sdp = init_sbd(sb); 1019 if (!sdp) { 1020 pr_warn("can't alloc struct gfs2_sbd\n"); 1021 return -ENOMEM; 1022 } 1023 sdp->sd_args = *args; 1024 1025 if (sdp->sd_args.ar_spectator) { 1026 sb->s_flags |= SB_RDONLY; 1027 set_bit(SDF_RORECOVERY, &sdp->sd_flags); 1028 } 1029 if (sdp->sd_args.ar_posix_acl) 1030 sb->s_flags |= SB_POSIXACL; 1031 if (sdp->sd_args.ar_nobarrier) 1032 set_bit(SDF_NOBARRIERS, &sdp->sd_flags); 1033 1034 sb->s_flags |= SB_NOSEC; 1035 sb->s_magic = GFS2_MAGIC; 1036 sb->s_op = &gfs2_super_ops; 1037 sb->s_d_op = &gfs2_dops; 1038 sb->s_export_op = &gfs2_export_ops; 1039 sb->s_xattr = gfs2_xattr_handlers; 1040 sb->s_qcop = &gfs2_quotactl_ops; 1041 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; 1042 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE; 1043 sb->s_time_gran = 1; 1044 sb->s_maxbytes = MAX_LFS_FILESIZE; 1045 1046 /* Set up the buffer cache and fill in some fake block size values 1047 to allow us to read-in the on-disk superblock. */ 1048 sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK); 1049 sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits; 1050 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift - 1051 GFS2_BASIC_BLOCK_SHIFT; 1052 sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift); 1053 1054 sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit; 1055 sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum; 1056 if (sdp->sd_args.ar_statfs_quantum) { 1057 sdp->sd_tune.gt_statfs_slow = 0; 1058 sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum; 1059 } else { 1060 sdp->sd_tune.gt_statfs_slow = 1; 1061 sdp->sd_tune.gt_statfs_quantum = 30; 1062 } 1063 1064 error = init_names(sdp, silent); 1065 if (error) { 1066 /* In this case, we haven't initialized sysfs, so we have to 1067 manually free the sdp. */ 1068 free_sbd(sdp); 1069 sb->s_fs_info = NULL; 1070 return error; 1071 } 1072 1073 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s", sdp->sd_table_name); 1074 1075 error = gfs2_sys_fs_add(sdp); 1076 /* 1077 * If we hit an error here, gfs2_sys_fs_add will have called function 1078 * kobject_put which causes the sysfs usage count to go to zero, which 1079 * causes sysfs to call function gfs2_sbd_release, which frees sdp. 1080 * Subsequent error paths here will call gfs2_sys_fs_del, which also 1081 * kobject_put to free sdp. 1082 */ 1083 if (error) 1084 return error; 1085 1086 gfs2_create_debugfs_file(sdp); 1087 1088 error = gfs2_lm_mount(sdp, silent); 1089 if (error) 1090 goto fail_debug; 1091 1092 error = init_locking(sdp, &mount_gh, DO); 1093 if (error) 1094 goto fail_lm; 1095 1096 error = init_sb(sdp, silent); 1097 if (error) 1098 goto fail_locking; 1099 1100 error = wait_on_journal(sdp); 1101 if (error) 1102 goto fail_sb; 1103 1104 /* 1105 * If user space has failed to join the cluster or some similar 1106 * failure has occurred, then the journal id will contain a 1107 * negative (error) number. This will then be returned to the 1108 * caller (of the mount syscall). We do this even for spectator 1109 * mounts (which just write a jid of 0 to indicate "ok" even though 1110 * the jid is unused in the spectator case) 1111 */ 1112 if (sdp->sd_lockstruct.ls_jid < 0) { 1113 error = sdp->sd_lockstruct.ls_jid; 1114 sdp->sd_lockstruct.ls_jid = 0; 1115 goto fail_sb; 1116 } 1117 1118 if (sdp->sd_args.ar_spectator) 1119 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.s", 1120 sdp->sd_table_name); 1121 else 1122 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.%u", 1123 sdp->sd_table_name, sdp->sd_lockstruct.ls_jid); 1124 1125 error = init_inodes(sdp, DO); 1126 if (error) 1127 goto fail_sb; 1128 1129 error = init_per_node(sdp, DO); 1130 if (error) 1131 goto fail_inodes; 1132 1133 error = gfs2_statfs_init(sdp); 1134 if (error) { 1135 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error); 1136 goto fail_per_node; 1137 } 1138 1139 if (!sb_rdonly(sb)) { 1140 error = gfs2_make_fs_rw(sdp); 1141 if (error) { 1142 fs_err(sdp, "can't make FS RW: %d\n", error); 1143 goto fail_per_node; 1144 } 1145 } 1146 1147 gfs2_glock_dq_uninit(&mount_gh); 1148 gfs2_online_uevent(sdp); 1149 return 0; 1150 1151 fail_per_node: 1152 init_per_node(sdp, UNDO); 1153 fail_inodes: 1154 init_inodes(sdp, UNDO); 1155 fail_sb: 1156 if (sdp->sd_root_dir) 1157 dput(sdp->sd_root_dir); 1158 if (sdp->sd_master_dir) 1159 dput(sdp->sd_master_dir); 1160 if (sb->s_root) 1161 dput(sb->s_root); 1162 sb->s_root = NULL; 1163 fail_locking: 1164 init_locking(sdp, &mount_gh, UNDO); 1165 fail_lm: 1166 complete_all(&sdp->sd_journal_ready); 1167 gfs2_gl_hash_clear(sdp); 1168 gfs2_lm_unmount(sdp); 1169 fail_debug: 1170 gfs2_delete_debugfs_file(sdp); 1171 /* gfs2_sys_fs_del must be the last thing we do, since it causes 1172 * sysfs to call function gfs2_sbd_release, which frees sdp. */ 1173 gfs2_sys_fs_del(sdp); 1174 sb->s_fs_info = NULL; 1175 return error; 1176 } 1177 1178 /** 1179 * gfs2_get_tree - Get the GFS2 superblock and root directory 1180 * @fc: The filesystem context 1181 * 1182 * Returns: 0 or -errno on error 1183 */ 1184 static int gfs2_get_tree(struct fs_context *fc) 1185 { 1186 struct gfs2_args *args = fc->fs_private; 1187 struct gfs2_sbd *sdp; 1188 int error; 1189 1190 error = get_tree_bdev(fc, gfs2_fill_super); 1191 if (error) 1192 return error; 1193 1194 sdp = fc->root->d_sb->s_fs_info; 1195 dput(fc->root); 1196 if (args->ar_meta) 1197 fc->root = dget(sdp->sd_master_dir); 1198 else 1199 fc->root = dget(sdp->sd_root_dir); 1200 return 0; 1201 } 1202 1203 static void gfs2_fc_free(struct fs_context *fc) 1204 { 1205 struct gfs2_args *args = fc->fs_private; 1206 1207 kfree(args); 1208 } 1209 1210 enum gfs2_param { 1211 Opt_lockproto, 1212 Opt_locktable, 1213 Opt_hostdata, 1214 Opt_spectator, 1215 Opt_ignore_local_fs, 1216 Opt_localflocks, 1217 Opt_localcaching, 1218 Opt_debug, 1219 Opt_upgrade, 1220 Opt_acl, 1221 Opt_quota, 1222 Opt_quota_flag, 1223 Opt_suiddir, 1224 Opt_data, 1225 Opt_meta, 1226 Opt_discard, 1227 Opt_commit, 1228 Opt_errors, 1229 Opt_statfs_quantum, 1230 Opt_statfs_percent, 1231 Opt_quota_quantum, 1232 Opt_barrier, 1233 Opt_rgrplvb, 1234 Opt_loccookie, 1235 }; 1236 1237 static const struct constant_table gfs2_param_quota[] = { 1238 {"off", GFS2_QUOTA_OFF}, 1239 {"account", GFS2_QUOTA_ACCOUNT}, 1240 {"on", GFS2_QUOTA_ON}, 1241 {} 1242 }; 1243 1244 enum opt_data { 1245 Opt_data_writeback = GFS2_DATA_WRITEBACK, 1246 Opt_data_ordered = GFS2_DATA_ORDERED, 1247 }; 1248 1249 static const struct constant_table gfs2_param_data[] = { 1250 {"writeback", Opt_data_writeback }, 1251 {"ordered", Opt_data_ordered }, 1252 {} 1253 }; 1254 1255 enum opt_errors { 1256 Opt_errors_withdraw = GFS2_ERRORS_WITHDRAW, 1257 Opt_errors_panic = GFS2_ERRORS_PANIC, 1258 }; 1259 1260 static const struct constant_table gfs2_param_errors[] = { 1261 {"withdraw", Opt_errors_withdraw }, 1262 {"panic", Opt_errors_panic }, 1263 {} 1264 }; 1265 1266 static const struct fs_parameter_spec gfs2_fs_parameters[] = { 1267 fsparam_string ("lockproto", Opt_lockproto), 1268 fsparam_string ("locktable", Opt_locktable), 1269 fsparam_string ("hostdata", Opt_hostdata), 1270 fsparam_flag ("spectator", Opt_spectator), 1271 fsparam_flag ("norecovery", Opt_spectator), 1272 fsparam_flag ("ignore_local_fs", Opt_ignore_local_fs), 1273 fsparam_flag ("localflocks", Opt_localflocks), 1274 fsparam_flag ("localcaching", Opt_localcaching), 1275 fsparam_flag_no("debug", Opt_debug), 1276 fsparam_flag ("upgrade", Opt_upgrade), 1277 fsparam_flag_no("acl", Opt_acl), 1278 fsparam_flag_no("suiddir", Opt_suiddir), 1279 fsparam_enum ("data", Opt_data, gfs2_param_data), 1280 fsparam_flag ("meta", Opt_meta), 1281 fsparam_flag_no("discard", Opt_discard), 1282 fsparam_s32 ("commit", Opt_commit), 1283 fsparam_enum ("errors", Opt_errors, gfs2_param_errors), 1284 fsparam_s32 ("statfs_quantum", Opt_statfs_quantum), 1285 fsparam_s32 ("statfs_percent", Opt_statfs_percent), 1286 fsparam_s32 ("quota_quantum", Opt_quota_quantum), 1287 fsparam_flag_no("barrier", Opt_barrier), 1288 fsparam_flag_no("rgrplvb", Opt_rgrplvb), 1289 fsparam_flag_no("loccookie", Opt_loccookie), 1290 /* quota can be a flag or an enum so it gets special treatment */ 1291 fsparam_flag_no("quota", Opt_quota_flag), 1292 fsparam_enum("quota", Opt_quota, gfs2_param_quota), 1293 {} 1294 }; 1295 1296 /* Parse a single mount parameter */ 1297 static int gfs2_parse_param(struct fs_context *fc, struct fs_parameter *param) 1298 { 1299 struct gfs2_args *args = fc->fs_private; 1300 struct fs_parse_result result; 1301 int o; 1302 1303 o = fs_parse(fc, gfs2_fs_parameters, param, &result); 1304 if (o < 0) 1305 return o; 1306 1307 switch (o) { 1308 case Opt_lockproto: 1309 strlcpy(args->ar_lockproto, param->string, GFS2_LOCKNAME_LEN); 1310 break; 1311 case Opt_locktable: 1312 strlcpy(args->ar_locktable, param->string, GFS2_LOCKNAME_LEN); 1313 break; 1314 case Opt_hostdata: 1315 strlcpy(args->ar_hostdata, param->string, GFS2_LOCKNAME_LEN); 1316 break; 1317 case Opt_spectator: 1318 args->ar_spectator = 1; 1319 break; 1320 case Opt_ignore_local_fs: 1321 /* Retained for backwards compat only */ 1322 break; 1323 case Opt_localflocks: 1324 args->ar_localflocks = 1; 1325 break; 1326 case Opt_localcaching: 1327 /* Retained for backwards compat only */ 1328 break; 1329 case Opt_debug: 1330 if (result.boolean && args->ar_errors == GFS2_ERRORS_PANIC) 1331 return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive"); 1332 args->ar_debug = result.boolean; 1333 break; 1334 case Opt_upgrade: 1335 /* Retained for backwards compat only */ 1336 break; 1337 case Opt_acl: 1338 args->ar_posix_acl = result.boolean; 1339 break; 1340 case Opt_quota_flag: 1341 args->ar_quota = result.negated ? GFS2_QUOTA_OFF : GFS2_QUOTA_ON; 1342 break; 1343 case Opt_quota: 1344 args->ar_quota = result.int_32; 1345 break; 1346 case Opt_suiddir: 1347 args->ar_suiddir = result.boolean; 1348 break; 1349 case Opt_data: 1350 /* The uint_32 result maps directly to GFS2_DATA_* */ 1351 args->ar_data = result.uint_32; 1352 break; 1353 case Opt_meta: 1354 args->ar_meta = 1; 1355 break; 1356 case Opt_discard: 1357 args->ar_discard = result.boolean; 1358 break; 1359 case Opt_commit: 1360 if (result.int_32 <= 0) 1361 return invalfc(fc, "commit mount option requires a positive numeric argument"); 1362 args->ar_commit = result.int_32; 1363 break; 1364 case Opt_statfs_quantum: 1365 if (result.int_32 < 0) 1366 return invalfc(fc, "statfs_quantum mount option requires a non-negative numeric argument"); 1367 args->ar_statfs_quantum = result.int_32; 1368 break; 1369 case Opt_quota_quantum: 1370 if (result.int_32 <= 0) 1371 return invalfc(fc, "quota_quantum mount option requires a positive numeric argument"); 1372 args->ar_quota_quantum = result.int_32; 1373 break; 1374 case Opt_statfs_percent: 1375 if (result.int_32 < 0 || result.int_32 > 100) 1376 return invalfc(fc, "statfs_percent mount option requires a numeric argument between 0 and 100"); 1377 args->ar_statfs_percent = result.int_32; 1378 break; 1379 case Opt_errors: 1380 if (args->ar_debug && result.uint_32 == GFS2_ERRORS_PANIC) 1381 return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive"); 1382 args->ar_errors = result.uint_32; 1383 break; 1384 case Opt_barrier: 1385 args->ar_nobarrier = result.boolean; 1386 break; 1387 case Opt_rgrplvb: 1388 args->ar_rgrplvb = result.boolean; 1389 break; 1390 case Opt_loccookie: 1391 args->ar_loccookie = result.boolean; 1392 break; 1393 default: 1394 return invalfc(fc, "invalid mount option: %s", param->key); 1395 } 1396 return 0; 1397 } 1398 1399 static int gfs2_reconfigure(struct fs_context *fc) 1400 { 1401 struct super_block *sb = fc->root->d_sb; 1402 struct gfs2_sbd *sdp = sb->s_fs_info; 1403 struct gfs2_args *oldargs = &sdp->sd_args; 1404 struct gfs2_args *newargs = fc->fs_private; 1405 struct gfs2_tune *gt = &sdp->sd_tune; 1406 int error = 0; 1407 1408 sync_filesystem(sb); 1409 1410 spin_lock(>->gt_spin); 1411 oldargs->ar_commit = gt->gt_logd_secs; 1412 oldargs->ar_quota_quantum = gt->gt_quota_quantum; 1413 if (gt->gt_statfs_slow) 1414 oldargs->ar_statfs_quantum = 0; 1415 else 1416 oldargs->ar_statfs_quantum = gt->gt_statfs_quantum; 1417 spin_unlock(>->gt_spin); 1418 1419 if (strcmp(newargs->ar_lockproto, oldargs->ar_lockproto)) { 1420 errorfc(fc, "reconfiguration of locking protocol not allowed"); 1421 return -EINVAL; 1422 } 1423 if (strcmp(newargs->ar_locktable, oldargs->ar_locktable)) { 1424 errorfc(fc, "reconfiguration of lock table not allowed"); 1425 return -EINVAL; 1426 } 1427 if (strcmp(newargs->ar_hostdata, oldargs->ar_hostdata)) { 1428 errorfc(fc, "reconfiguration of host data not allowed"); 1429 return -EINVAL; 1430 } 1431 if (newargs->ar_spectator != oldargs->ar_spectator) { 1432 errorfc(fc, "reconfiguration of spectator mode not allowed"); 1433 return -EINVAL; 1434 } 1435 if (newargs->ar_localflocks != oldargs->ar_localflocks) { 1436 errorfc(fc, "reconfiguration of localflocks not allowed"); 1437 return -EINVAL; 1438 } 1439 if (newargs->ar_meta != oldargs->ar_meta) { 1440 errorfc(fc, "switching between gfs2 and gfs2meta not allowed"); 1441 return -EINVAL; 1442 } 1443 if (oldargs->ar_spectator) 1444 fc->sb_flags |= SB_RDONLY; 1445 1446 if ((sb->s_flags ^ fc->sb_flags) & SB_RDONLY) { 1447 if (fc->sb_flags & SB_RDONLY) { 1448 error = gfs2_make_fs_ro(sdp); 1449 if (error) 1450 errorfc(fc, "unable to remount read-only"); 1451 } else { 1452 error = gfs2_make_fs_rw(sdp); 1453 if (error) 1454 errorfc(fc, "unable to remount read-write"); 1455 } 1456 } 1457 sdp->sd_args = *newargs; 1458 1459 if (sdp->sd_args.ar_posix_acl) 1460 sb->s_flags |= SB_POSIXACL; 1461 else 1462 sb->s_flags &= ~SB_POSIXACL; 1463 if (sdp->sd_args.ar_nobarrier) 1464 set_bit(SDF_NOBARRIERS, &sdp->sd_flags); 1465 else 1466 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags); 1467 spin_lock(>->gt_spin); 1468 gt->gt_logd_secs = newargs->ar_commit; 1469 gt->gt_quota_quantum = newargs->ar_quota_quantum; 1470 if (newargs->ar_statfs_quantum) { 1471 gt->gt_statfs_slow = 0; 1472 gt->gt_statfs_quantum = newargs->ar_statfs_quantum; 1473 } 1474 else { 1475 gt->gt_statfs_slow = 1; 1476 gt->gt_statfs_quantum = 30; 1477 } 1478 spin_unlock(>->gt_spin); 1479 1480 gfs2_online_uevent(sdp); 1481 return error; 1482 } 1483 1484 static const struct fs_context_operations gfs2_context_ops = { 1485 .free = gfs2_fc_free, 1486 .parse_param = gfs2_parse_param, 1487 .get_tree = gfs2_get_tree, 1488 .reconfigure = gfs2_reconfigure, 1489 }; 1490 1491 /* Set up the filesystem mount context */ 1492 static int gfs2_init_fs_context(struct fs_context *fc) 1493 { 1494 struct gfs2_args *args; 1495 1496 args = kmalloc(sizeof(*args), GFP_KERNEL); 1497 if (args == NULL) 1498 return -ENOMEM; 1499 1500 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) { 1501 struct gfs2_sbd *sdp = fc->root->d_sb->s_fs_info; 1502 1503 *args = sdp->sd_args; 1504 } else { 1505 memset(args, 0, sizeof(*args)); 1506 args->ar_quota = GFS2_QUOTA_DEFAULT; 1507 args->ar_data = GFS2_DATA_DEFAULT; 1508 args->ar_commit = 30; 1509 args->ar_statfs_quantum = 30; 1510 args->ar_quota_quantum = 60; 1511 args->ar_errors = GFS2_ERRORS_DEFAULT; 1512 } 1513 fc->fs_private = args; 1514 fc->ops = &gfs2_context_ops; 1515 return 0; 1516 } 1517 1518 static int set_meta_super(struct super_block *s, struct fs_context *fc) 1519 { 1520 return -EINVAL; 1521 } 1522 1523 static int test_meta_super(struct super_block *s, struct fs_context *fc) 1524 { 1525 return (fc->sget_key == s->s_bdev); 1526 } 1527 1528 static int gfs2_meta_get_tree(struct fs_context *fc) 1529 { 1530 struct super_block *s; 1531 struct gfs2_sbd *sdp; 1532 struct path path; 1533 int error; 1534 1535 if (!fc->source || !*fc->source) 1536 return -EINVAL; 1537 1538 error = kern_path(fc->source, LOOKUP_FOLLOW, &path); 1539 if (error) { 1540 pr_warn("path_lookup on %s returned error %d\n", 1541 fc->source, error); 1542 return error; 1543 } 1544 fc->fs_type = &gfs2_fs_type; 1545 fc->sget_key = path.dentry->d_sb->s_bdev; 1546 s = sget_fc(fc, test_meta_super, set_meta_super); 1547 path_put(&path); 1548 if (IS_ERR(s)) { 1549 pr_warn("gfs2 mount does not exist\n"); 1550 return PTR_ERR(s); 1551 } 1552 if ((fc->sb_flags ^ s->s_flags) & SB_RDONLY) { 1553 deactivate_locked_super(s); 1554 return -EBUSY; 1555 } 1556 sdp = s->s_fs_info; 1557 fc->root = dget(sdp->sd_master_dir); 1558 return 0; 1559 } 1560 1561 static const struct fs_context_operations gfs2_meta_context_ops = { 1562 .free = gfs2_fc_free, 1563 .get_tree = gfs2_meta_get_tree, 1564 }; 1565 1566 static int gfs2_meta_init_fs_context(struct fs_context *fc) 1567 { 1568 int ret = gfs2_init_fs_context(fc); 1569 1570 if (ret) 1571 return ret; 1572 1573 fc->ops = &gfs2_meta_context_ops; 1574 return 0; 1575 } 1576 1577 static void gfs2_kill_sb(struct super_block *sb) 1578 { 1579 struct gfs2_sbd *sdp = sb->s_fs_info; 1580 1581 if (sdp == NULL) { 1582 kill_block_super(sb); 1583 return; 1584 } 1585 1586 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SYNC | GFS2_LFC_KILL_SB); 1587 dput(sdp->sd_root_dir); 1588 dput(sdp->sd_master_dir); 1589 sdp->sd_root_dir = NULL; 1590 sdp->sd_master_dir = NULL; 1591 shrink_dcache_sb(sb); 1592 kill_block_super(sb); 1593 } 1594 1595 struct file_system_type gfs2_fs_type = { 1596 .name = "gfs2", 1597 .fs_flags = FS_REQUIRES_DEV, 1598 .init_fs_context = gfs2_init_fs_context, 1599 .parameters = gfs2_fs_parameters, 1600 .kill_sb = gfs2_kill_sb, 1601 .owner = THIS_MODULE, 1602 }; 1603 MODULE_ALIAS_FS("gfs2"); 1604 1605 struct file_system_type gfs2meta_fs_type = { 1606 .name = "gfs2meta", 1607 .fs_flags = FS_REQUIRES_DEV, 1608 .init_fs_context = gfs2_meta_init_fs_context, 1609 .owner = THIS_MODULE, 1610 }; 1611 MODULE_ALIAS_FS("gfs2meta"); 1612