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 INIT_LIST_HEAD(&sdp->sd_sc_inodes_list); 114 115 mapping = &sdp->sd_aspace; 116 117 address_space_init_once(mapping); 118 mapping->a_ops = &gfs2_rgrp_aops; 119 mapping->host = sb->s_bdev->bd_inode; 120 mapping->flags = 0; 121 mapping_set_gfp_mask(mapping, GFP_NOFS); 122 mapping->private_data = NULL; 123 mapping->writeback_index = 0; 124 125 spin_lock_init(&sdp->sd_log_lock); 126 atomic_set(&sdp->sd_log_pinned, 0); 127 INIT_LIST_HEAD(&sdp->sd_log_revokes); 128 INIT_LIST_HEAD(&sdp->sd_log_ordered); 129 spin_lock_init(&sdp->sd_ordered_lock); 130 131 init_waitqueue_head(&sdp->sd_log_waitq); 132 init_waitqueue_head(&sdp->sd_logd_waitq); 133 spin_lock_init(&sdp->sd_ail_lock); 134 INIT_LIST_HEAD(&sdp->sd_ail1_list); 135 INIT_LIST_HEAD(&sdp->sd_ail2_list); 136 137 init_rwsem(&sdp->sd_log_flush_lock); 138 atomic_set(&sdp->sd_log_in_flight, 0); 139 atomic_set(&sdp->sd_reserving_log, 0); 140 init_waitqueue_head(&sdp->sd_reserving_log_wait); 141 init_waitqueue_head(&sdp->sd_log_flush_wait); 142 atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN); 143 mutex_init(&sdp->sd_freeze_mutex); 144 145 return sdp; 146 147 fail: 148 free_sbd(sdp); 149 return NULL; 150 } 151 152 /** 153 * gfs2_check_sb - Check superblock 154 * @sdp: the filesystem 155 * @sb: The superblock 156 * @silent: Don't print a message if the check fails 157 * 158 * Checks the version code of the FS is one that we understand how to 159 * read and that the sizes of the various on-disk structures have not 160 * changed. 161 */ 162 163 static int gfs2_check_sb(struct gfs2_sbd *sdp, int silent) 164 { 165 struct gfs2_sb_host *sb = &sdp->sd_sb; 166 167 if (sb->sb_magic != GFS2_MAGIC || 168 sb->sb_type != GFS2_METATYPE_SB) { 169 if (!silent) 170 pr_warn("not a GFS2 filesystem\n"); 171 return -EINVAL; 172 } 173 174 if (sb->sb_fs_format != GFS2_FORMAT_FS || 175 sb->sb_multihost_format != GFS2_FORMAT_MULTI) { 176 fs_warn(sdp, "Unknown on-disk format, unable to mount\n"); 177 return -EINVAL; 178 } 179 180 if (sb->sb_bsize < 512 || sb->sb_bsize > PAGE_SIZE || 181 (sb->sb_bsize & (sb->sb_bsize - 1))) { 182 pr_warn("Invalid superblock size\n"); 183 return -EINVAL; 184 } 185 186 return 0; 187 } 188 189 static void end_bio_io_page(struct bio *bio) 190 { 191 struct page *page = bio->bi_private; 192 193 if (!bio->bi_status) 194 SetPageUptodate(page); 195 else 196 pr_warn("error %d reading superblock\n", bio->bi_status); 197 unlock_page(page); 198 } 199 200 static void gfs2_sb_in(struct gfs2_sbd *sdp, const void *buf) 201 { 202 struct gfs2_sb_host *sb = &sdp->sd_sb; 203 struct super_block *s = sdp->sd_vfs; 204 const struct gfs2_sb *str = buf; 205 206 sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic); 207 sb->sb_type = be32_to_cpu(str->sb_header.mh_type); 208 sb->sb_format = be32_to_cpu(str->sb_header.mh_format); 209 sb->sb_fs_format = be32_to_cpu(str->sb_fs_format); 210 sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format); 211 sb->sb_bsize = be32_to_cpu(str->sb_bsize); 212 sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift); 213 sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr); 214 sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino); 215 sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr); 216 sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino); 217 218 memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN); 219 memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN); 220 memcpy(&s->s_uuid, str->sb_uuid, 16); 221 } 222 223 /** 224 * gfs2_read_super - Read the gfs2 super block from disk 225 * @sdp: The GFS2 super block 226 * @sector: The location of the super block 227 * @error: The error code to return 228 * 229 * This uses the bio functions to read the super block from disk 230 * because we want to be 100% sure that we never read cached data. 231 * A super block is read twice only during each GFS2 mount and is 232 * never written to by the filesystem. The first time its read no 233 * locks are held, and the only details which are looked at are those 234 * relating to the locking protocol. Once locking is up and working, 235 * the sb is read again under the lock to establish the location of 236 * the master directory (contains pointers to journals etc) and the 237 * root directory. 238 * 239 * Returns: 0 on success or error 240 */ 241 242 static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector, int silent) 243 { 244 struct super_block *sb = sdp->sd_vfs; 245 struct gfs2_sb *p; 246 struct page *page; 247 struct bio *bio; 248 249 page = alloc_page(GFP_NOFS); 250 if (unlikely(!page)) 251 return -ENOMEM; 252 253 ClearPageUptodate(page); 254 ClearPageDirty(page); 255 lock_page(page); 256 257 bio = bio_alloc(GFP_NOFS, 1); 258 bio->bi_iter.bi_sector = sector * (sb->s_blocksize >> 9); 259 bio_set_dev(bio, sb->s_bdev); 260 bio_add_page(bio, page, PAGE_SIZE, 0); 261 262 bio->bi_end_io = end_bio_io_page; 263 bio->bi_private = page; 264 bio_set_op_attrs(bio, REQ_OP_READ, REQ_META); 265 submit_bio(bio); 266 wait_on_page_locked(page); 267 bio_put(bio); 268 if (!PageUptodate(page)) { 269 __free_page(page); 270 return -EIO; 271 } 272 p = kmap(page); 273 gfs2_sb_in(sdp, p); 274 kunmap(page); 275 __free_page(page); 276 return gfs2_check_sb(sdp, silent); 277 } 278 279 /** 280 * gfs2_read_sb - Read super block 281 * @sdp: The GFS2 superblock 282 * @silent: Don't print message if mount fails 283 * 284 */ 285 286 static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent) 287 { 288 u32 hash_blocks, ind_blocks, leaf_blocks; 289 u32 tmp_blocks; 290 unsigned int x; 291 int error; 292 293 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent); 294 if (error) { 295 if (!silent) 296 fs_err(sdp, "can't read superblock\n"); 297 return error; 298 } 299 300 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift - 301 GFS2_BASIC_BLOCK_SHIFT; 302 sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift); 303 sdp->sd_diptrs = (sdp->sd_sb.sb_bsize - 304 sizeof(struct gfs2_dinode)) / sizeof(u64); 305 sdp->sd_inptrs = (sdp->sd_sb.sb_bsize - 306 sizeof(struct gfs2_meta_header)) / sizeof(u64); 307 sdp->sd_ldptrs = (sdp->sd_sb.sb_bsize - 308 sizeof(struct gfs2_log_descriptor)) / sizeof(u64); 309 sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header); 310 sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2; 311 sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1; 312 sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64); 313 sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize - 314 sizeof(struct gfs2_meta_header)) / 315 sizeof(struct gfs2_quota_change); 316 sdp->sd_blocks_per_bitmap = (sdp->sd_sb.sb_bsize - 317 sizeof(struct gfs2_meta_header)) 318 * GFS2_NBBY; /* not the rgrp bitmap, subsequent bitmaps only */ 319 320 /* Compute maximum reservation required to add a entry to a directory */ 321 322 hash_blocks = DIV_ROUND_UP(sizeof(u64) * BIT(GFS2_DIR_MAX_DEPTH), 323 sdp->sd_jbsize); 324 325 ind_blocks = 0; 326 for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) { 327 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs); 328 ind_blocks += tmp_blocks; 329 } 330 331 leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH; 332 333 sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks; 334 335 sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize - 336 sizeof(struct gfs2_dinode); 337 sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs; 338 for (x = 2;; x++) { 339 u64 space, d; 340 u32 m; 341 342 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs; 343 d = space; 344 m = do_div(d, sdp->sd_inptrs); 345 346 if (d != sdp->sd_heightsize[x - 1] || m) 347 break; 348 sdp->sd_heightsize[x] = space; 349 } 350 sdp->sd_max_height = x; 351 sdp->sd_heightsize[x] = ~0; 352 gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT); 353 354 sdp->sd_max_dents_per_leaf = (sdp->sd_sb.sb_bsize - 355 sizeof(struct gfs2_leaf)) / 356 GFS2_MIN_DIRENT_SIZE; 357 return 0; 358 } 359 360 static int init_names(struct gfs2_sbd *sdp, int silent) 361 { 362 char *proto, *table; 363 int error = 0; 364 365 proto = sdp->sd_args.ar_lockproto; 366 table = sdp->sd_args.ar_locktable; 367 368 /* Try to autodetect */ 369 370 if (!proto[0] || !table[0]) { 371 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent); 372 if (error) 373 return error; 374 375 if (!proto[0]) 376 proto = sdp->sd_sb.sb_lockproto; 377 if (!table[0]) 378 table = sdp->sd_sb.sb_locktable; 379 } 380 381 if (!table[0]) 382 table = sdp->sd_vfs->s_id; 383 384 strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN); 385 strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN); 386 387 table = sdp->sd_table_name; 388 while ((table = strchr(table, '/'))) 389 *table = '_'; 390 391 return error; 392 } 393 394 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh, 395 int undo) 396 { 397 int error = 0; 398 399 if (undo) 400 goto fail_trans; 401 402 error = gfs2_glock_nq_num(sdp, 403 GFS2_MOUNT_LOCK, &gfs2_nondisk_glops, 404 LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE, 405 mount_gh); 406 if (error) { 407 fs_err(sdp, "can't acquire mount glock: %d\n", error); 408 goto fail; 409 } 410 411 error = gfs2_glock_nq_num(sdp, 412 GFS2_LIVE_LOCK, &gfs2_nondisk_glops, 413 LM_ST_SHARED, 414 LM_FLAG_NOEXP | GL_EXACT, 415 &sdp->sd_live_gh); 416 if (error) { 417 fs_err(sdp, "can't acquire live glock: %d\n", error); 418 goto fail_mount; 419 } 420 421 error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops, 422 CREATE, &sdp->sd_rename_gl); 423 if (error) { 424 fs_err(sdp, "can't create rename glock: %d\n", error); 425 goto fail_live; 426 } 427 428 error = gfs2_glock_get(sdp, GFS2_FREEZE_LOCK, &gfs2_freeze_glops, 429 CREATE, &sdp->sd_freeze_gl); 430 if (error) { 431 fs_err(sdp, "can't create transaction glock: %d\n", error); 432 goto fail_rename; 433 } 434 435 return 0; 436 437 fail_trans: 438 gfs2_glock_put(sdp->sd_freeze_gl); 439 fail_rename: 440 gfs2_glock_put(sdp->sd_rename_gl); 441 fail_live: 442 gfs2_glock_dq_uninit(&sdp->sd_live_gh); 443 fail_mount: 444 gfs2_glock_dq_uninit(mount_gh); 445 fail: 446 return error; 447 } 448 449 static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr, 450 u64 no_addr, const char *name) 451 { 452 struct gfs2_sbd *sdp = sb->s_fs_info; 453 struct dentry *dentry; 454 struct inode *inode; 455 456 inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0, 457 GFS2_BLKST_FREE /* ignore */); 458 if (IS_ERR(inode)) { 459 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode)); 460 return PTR_ERR(inode); 461 } 462 dentry = d_make_root(inode); 463 if (!dentry) { 464 fs_err(sdp, "can't alloc %s dentry\n", name); 465 return -ENOMEM; 466 } 467 *dptr = dentry; 468 return 0; 469 } 470 471 static int init_sb(struct gfs2_sbd *sdp, int silent) 472 { 473 struct super_block *sb = sdp->sd_vfs; 474 struct gfs2_holder sb_gh; 475 u64 no_addr; 476 int ret; 477 478 ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops, 479 LM_ST_SHARED, 0, &sb_gh); 480 if (ret) { 481 fs_err(sdp, "can't acquire superblock glock: %d\n", ret); 482 return ret; 483 } 484 485 ret = gfs2_read_sb(sdp, silent); 486 if (ret) { 487 fs_err(sdp, "can't read superblock: %d\n", ret); 488 goto out; 489 } 490 491 /* Set up the buffer cache and SB for real */ 492 if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) { 493 ret = -EINVAL; 494 fs_err(sdp, "FS block size (%u) is too small for device " 495 "block size (%u)\n", 496 sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev)); 497 goto out; 498 } 499 if (sdp->sd_sb.sb_bsize > PAGE_SIZE) { 500 ret = -EINVAL; 501 fs_err(sdp, "FS block size (%u) is too big for machine " 502 "page size (%u)\n", 503 sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE); 504 goto out; 505 } 506 sb_set_blocksize(sb, sdp->sd_sb.sb_bsize); 507 508 /* Get the root inode */ 509 no_addr = sdp->sd_sb.sb_root_dir.no_addr; 510 ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root"); 511 if (ret) 512 goto out; 513 514 /* Get the master inode */ 515 no_addr = sdp->sd_sb.sb_master_dir.no_addr; 516 ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master"); 517 if (ret) { 518 dput(sdp->sd_root_dir); 519 goto out; 520 } 521 sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir); 522 out: 523 gfs2_glock_dq_uninit(&sb_gh); 524 return ret; 525 } 526 527 static void gfs2_others_may_mount(struct gfs2_sbd *sdp) 528 { 529 char *message = "FIRSTMOUNT=Done"; 530 char *envp[] = { message, NULL }; 531 532 fs_info(sdp, "first mount done, others may mount\n"); 533 534 if (sdp->sd_lockstruct.ls_ops->lm_first_done) 535 sdp->sd_lockstruct.ls_ops->lm_first_done(sdp); 536 537 kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp); 538 } 539 540 /** 541 * gfs2_jindex_hold - Grab a lock on the jindex 542 * @sdp: The GFS2 superblock 543 * @ji_gh: the holder for the jindex glock 544 * 545 * Returns: errno 546 */ 547 548 static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh) 549 { 550 struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex); 551 struct qstr name; 552 char buf[20]; 553 struct gfs2_jdesc *jd; 554 int error; 555 556 name.name = buf; 557 558 mutex_lock(&sdp->sd_jindex_mutex); 559 560 for (;;) { 561 struct gfs2_inode *jip; 562 563 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh); 564 if (error) 565 break; 566 567 name.len = sprintf(buf, "journal%u", sdp->sd_journals); 568 name.hash = gfs2_disk_hash(name.name, name.len); 569 570 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL); 571 if (error == -ENOENT) { 572 error = 0; 573 break; 574 } 575 576 gfs2_glock_dq_uninit(ji_gh); 577 578 if (error) 579 break; 580 581 error = -ENOMEM; 582 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL); 583 if (!jd) 584 break; 585 586 INIT_LIST_HEAD(&jd->extent_list); 587 INIT_LIST_HEAD(&jd->jd_revoke_list); 588 589 INIT_WORK(&jd->jd_work, gfs2_recover_func); 590 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1); 591 if (IS_ERR_OR_NULL(jd->jd_inode)) { 592 if (!jd->jd_inode) 593 error = -ENOENT; 594 else 595 error = PTR_ERR(jd->jd_inode); 596 kfree(jd); 597 break; 598 } 599 600 spin_lock(&sdp->sd_jindex_spin); 601 jd->jd_jid = sdp->sd_journals++; 602 jip = GFS2_I(jd->jd_inode); 603 jd->jd_no_addr = jip->i_no_addr; 604 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list); 605 spin_unlock(&sdp->sd_jindex_spin); 606 } 607 608 mutex_unlock(&sdp->sd_jindex_mutex); 609 610 return error; 611 } 612 613 /** 614 * init_statfs - look up and initialize master and local (per node) statfs inodes 615 * @sdp: The GFS2 superblock 616 * 617 * This should be called after the jindex is initialized in init_journal() and 618 * before gfs2_journal_recovery() is called because we need to be able to write 619 * to these inodes during recovery. 620 * 621 * Returns: errno 622 */ 623 static int init_statfs(struct gfs2_sbd *sdp) 624 { 625 int error = 0; 626 struct inode *master = d_inode(sdp->sd_master_dir); 627 struct inode *pn = NULL; 628 char buf[30]; 629 struct gfs2_jdesc *jd; 630 struct gfs2_inode *ip; 631 632 sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs"); 633 if (IS_ERR(sdp->sd_statfs_inode)) { 634 error = PTR_ERR(sdp->sd_statfs_inode); 635 fs_err(sdp, "can't read in statfs inode: %d\n", error); 636 goto fail; 637 } 638 639 pn = gfs2_lookup_simple(master, "per_node"); 640 if (IS_ERR(pn)) { 641 error = PTR_ERR(pn); 642 fs_err(sdp, "can't find per_node directory: %d\n", error); 643 goto put_statfs; 644 } 645 646 /* For each jid, lookup the corresponding local statfs inode in the 647 * per_node metafs directory and save it in the sdp->sd_sc_inodes_list. */ 648 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { 649 struct local_statfs_inode *lsi = 650 kmalloc(sizeof(struct local_statfs_inode), GFP_NOFS); 651 if (!lsi) { 652 error = -ENOMEM; 653 goto free_local; 654 } 655 sprintf(buf, "statfs_change%u", jd->jd_jid); 656 lsi->si_sc_inode = gfs2_lookup_simple(pn, buf); 657 if (IS_ERR(lsi->si_sc_inode)) { 658 error = PTR_ERR(lsi->si_sc_inode); 659 fs_err(sdp, "can't find local \"sc\" file#%u: %d\n", 660 jd->jd_jid, error); 661 goto free_local; 662 } 663 lsi->si_jid = jd->jd_jid; 664 if (jd->jd_jid == sdp->sd_jdesc->jd_jid) 665 sdp->sd_sc_inode = lsi->si_sc_inode; 666 667 list_add_tail(&lsi->si_list, &sdp->sd_sc_inodes_list); 668 } 669 670 iput(pn); 671 ip = GFS2_I(sdp->sd_sc_inode); 672 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, 673 &sdp->sd_sc_gh); 674 if (error) { 675 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error); 676 goto free_local; 677 } 678 return 0; 679 680 free_local: 681 free_local_statfs_inodes(sdp); 682 iput(pn); 683 put_statfs: 684 iput(sdp->sd_statfs_inode); 685 fail: 686 return error; 687 } 688 689 /* Uninitialize and free up memory used by the list of statfs inodes */ 690 static void uninit_statfs(struct gfs2_sbd *sdp) 691 { 692 gfs2_glock_dq_uninit(&sdp->sd_sc_gh); 693 free_local_statfs_inodes(sdp); 694 iput(sdp->sd_statfs_inode); 695 } 696 697 static int init_journal(struct gfs2_sbd *sdp, int undo) 698 { 699 struct inode *master = d_inode(sdp->sd_master_dir); 700 struct gfs2_holder ji_gh; 701 struct gfs2_inode *ip; 702 int jindex = 1; 703 int error = 0; 704 705 if (undo) { 706 jindex = 0; 707 goto fail_jinode_gh; 708 } 709 710 sdp->sd_jindex = gfs2_lookup_simple(master, "jindex"); 711 if (IS_ERR(sdp->sd_jindex)) { 712 fs_err(sdp, "can't lookup journal index: %d\n", error); 713 return PTR_ERR(sdp->sd_jindex); 714 } 715 716 /* Load in the journal index special file */ 717 718 error = gfs2_jindex_hold(sdp, &ji_gh); 719 if (error) { 720 fs_err(sdp, "can't read journal index: %d\n", error); 721 goto fail; 722 } 723 724 error = -EUSERS; 725 if (!gfs2_jindex_size(sdp)) { 726 fs_err(sdp, "no journals!\n"); 727 goto fail_jindex; 728 } 729 730 atomic_set(&sdp->sd_log_blks_needed, 0); 731 if (sdp->sd_args.ar_spectator) { 732 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0); 733 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks); 734 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5); 735 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5); 736 } else { 737 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) { 738 fs_err(sdp, "can't mount journal #%u\n", 739 sdp->sd_lockstruct.ls_jid); 740 fs_err(sdp, "there are only %u journals (0 - %u)\n", 741 gfs2_jindex_size(sdp), 742 gfs2_jindex_size(sdp) - 1); 743 goto fail_jindex; 744 } 745 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid); 746 747 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid, 748 &gfs2_journal_glops, 749 LM_ST_EXCLUSIVE, 750 LM_FLAG_NOEXP | GL_NOCACHE, 751 &sdp->sd_journal_gh); 752 if (error) { 753 fs_err(sdp, "can't acquire journal glock: %d\n", error); 754 goto fail_jindex; 755 } 756 757 ip = GFS2_I(sdp->sd_jdesc->jd_inode); 758 sdp->sd_jinode_gl = ip->i_gl; 759 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 760 LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE, 761 &sdp->sd_jinode_gh); 762 if (error) { 763 fs_err(sdp, "can't acquire journal inode glock: %d\n", 764 error); 765 goto fail_journal_gh; 766 } 767 768 error = gfs2_jdesc_check(sdp->sd_jdesc); 769 if (error) { 770 fs_err(sdp, "my journal (%u) is bad: %d\n", 771 sdp->sd_jdesc->jd_jid, error); 772 goto fail_jinode_gh; 773 } 774 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks); 775 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5); 776 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5); 777 778 /* Map the extents for this journal's blocks */ 779 gfs2_map_journal_extents(sdp, sdp->sd_jdesc); 780 } 781 trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free)); 782 783 /* Lookup statfs inodes here so journal recovery can use them. */ 784 error = init_statfs(sdp); 785 if (error) 786 goto fail_jinode_gh; 787 788 if (sdp->sd_lockstruct.ls_first) { 789 unsigned int x; 790 for (x = 0; x < sdp->sd_journals; x++) { 791 struct gfs2_jdesc *jd = gfs2_jdesc_find(sdp, x); 792 793 if (sdp->sd_args.ar_spectator) { 794 error = check_journal_clean(sdp, jd, true); 795 if (error) 796 goto fail_statfs; 797 continue; 798 } 799 error = gfs2_recover_journal(jd, true); 800 if (error) { 801 fs_err(sdp, "error recovering journal %u: %d\n", 802 x, error); 803 goto fail_statfs; 804 } 805 } 806 807 gfs2_others_may_mount(sdp); 808 } else if (!sdp->sd_args.ar_spectator) { 809 error = gfs2_recover_journal(sdp->sd_jdesc, true); 810 if (error) { 811 fs_err(sdp, "error recovering my journal: %d\n", error); 812 goto fail_statfs; 813 } 814 } 815 816 sdp->sd_log_idle = 1; 817 set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags); 818 gfs2_glock_dq_uninit(&ji_gh); 819 jindex = 0; 820 INIT_WORK(&sdp->sd_freeze_work, gfs2_freeze_func); 821 return 0; 822 823 fail_statfs: 824 uninit_statfs(sdp); 825 fail_jinode_gh: 826 /* A withdraw may have done dq/uninit so now we need to check it */ 827 if (!sdp->sd_args.ar_spectator && 828 gfs2_holder_initialized(&sdp->sd_jinode_gh)) 829 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh); 830 fail_journal_gh: 831 if (!sdp->sd_args.ar_spectator && 832 gfs2_holder_initialized(&sdp->sd_journal_gh)) 833 gfs2_glock_dq_uninit(&sdp->sd_journal_gh); 834 fail_jindex: 835 gfs2_jindex_free(sdp); 836 if (jindex) 837 gfs2_glock_dq_uninit(&ji_gh); 838 fail: 839 iput(sdp->sd_jindex); 840 return error; 841 } 842 843 static struct lock_class_key gfs2_quota_imutex_key; 844 845 static int init_inodes(struct gfs2_sbd *sdp, int undo) 846 { 847 int error = 0; 848 struct inode *master = d_inode(sdp->sd_master_dir); 849 850 if (undo) 851 goto fail_qinode; 852 853 error = init_journal(sdp, undo); 854 complete_all(&sdp->sd_journal_ready); 855 if (error) 856 goto fail; 857 858 /* Read in the resource index inode */ 859 sdp->sd_rindex = gfs2_lookup_simple(master, "rindex"); 860 if (IS_ERR(sdp->sd_rindex)) { 861 error = PTR_ERR(sdp->sd_rindex); 862 fs_err(sdp, "can't get resource index inode: %d\n", error); 863 goto fail_journal; 864 } 865 sdp->sd_rindex_uptodate = 0; 866 867 /* Read in the quota inode */ 868 sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota"); 869 if (IS_ERR(sdp->sd_quota_inode)) { 870 error = PTR_ERR(sdp->sd_quota_inode); 871 fs_err(sdp, "can't get quota file inode: %d\n", error); 872 goto fail_rindex; 873 } 874 /* 875 * i_rwsem on quota files is special. Since this inode is hidden system 876 * file, we are safe to define locking ourselves. 877 */ 878 lockdep_set_class(&sdp->sd_quota_inode->i_rwsem, 879 &gfs2_quota_imutex_key); 880 881 error = gfs2_rindex_update(sdp); 882 if (error) 883 goto fail_qinode; 884 885 return 0; 886 887 fail_qinode: 888 iput(sdp->sd_quota_inode); 889 fail_rindex: 890 gfs2_clear_rgrpd(sdp); 891 iput(sdp->sd_rindex); 892 fail_journal: 893 init_journal(sdp, UNDO); 894 fail: 895 return error; 896 } 897 898 static int init_per_node(struct gfs2_sbd *sdp, int undo) 899 { 900 struct inode *pn = NULL; 901 char buf[30]; 902 int error = 0; 903 struct gfs2_inode *ip; 904 struct inode *master = d_inode(sdp->sd_master_dir); 905 906 if (sdp->sd_args.ar_spectator) 907 return 0; 908 909 if (undo) 910 goto fail_qc_gh; 911 912 pn = gfs2_lookup_simple(master, "per_node"); 913 if (IS_ERR(pn)) { 914 error = PTR_ERR(pn); 915 fs_err(sdp, "can't find per_node directory: %d\n", error); 916 return error; 917 } 918 919 sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid); 920 sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf); 921 if (IS_ERR(sdp->sd_qc_inode)) { 922 error = PTR_ERR(sdp->sd_qc_inode); 923 fs_err(sdp, "can't find local \"qc\" file: %d\n", error); 924 goto fail_ut_i; 925 } 926 927 iput(pn); 928 pn = NULL; 929 930 ip = GFS2_I(sdp->sd_qc_inode); 931 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, 932 &sdp->sd_qc_gh); 933 if (error) { 934 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error); 935 goto fail_qc_i; 936 } 937 938 return 0; 939 940 fail_qc_gh: 941 gfs2_glock_dq_uninit(&sdp->sd_qc_gh); 942 fail_qc_i: 943 iput(sdp->sd_qc_inode); 944 fail_ut_i: 945 iput(pn); 946 return error; 947 } 948 949 static const match_table_t nolock_tokens = { 950 { Opt_jid, "jid=%d", }, 951 { Opt_err, NULL }, 952 }; 953 954 static const struct lm_lockops nolock_ops = { 955 .lm_proto_name = "lock_nolock", 956 .lm_put_lock = gfs2_glock_free, 957 .lm_tokens = &nolock_tokens, 958 }; 959 960 /** 961 * gfs2_lm_mount - mount a locking protocol 962 * @sdp: the filesystem 963 * @args: mount arguments 964 * @silent: if 1, don't complain if the FS isn't a GFS2 fs 965 * 966 * Returns: errno 967 */ 968 969 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent) 970 { 971 const struct lm_lockops *lm; 972 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 973 struct gfs2_args *args = &sdp->sd_args; 974 const char *proto = sdp->sd_proto_name; 975 const char *table = sdp->sd_table_name; 976 char *o, *options; 977 int ret; 978 979 if (!strcmp("lock_nolock", proto)) { 980 lm = &nolock_ops; 981 sdp->sd_args.ar_localflocks = 1; 982 #ifdef CONFIG_GFS2_FS_LOCKING_DLM 983 } else if (!strcmp("lock_dlm", proto)) { 984 lm = &gfs2_dlm_ops; 985 #endif 986 } else { 987 pr_info("can't find protocol %s\n", proto); 988 return -ENOENT; 989 } 990 991 fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table); 992 993 ls->ls_ops = lm; 994 ls->ls_first = 1; 995 996 for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) { 997 substring_t tmp[MAX_OPT_ARGS]; 998 int token, option; 999 1000 if (!o || !*o) 1001 continue; 1002 1003 token = match_token(o, *lm->lm_tokens, tmp); 1004 switch (token) { 1005 case Opt_jid: 1006 ret = match_int(&tmp[0], &option); 1007 if (ret || option < 0) 1008 goto hostdata_error; 1009 if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags)) 1010 ls->ls_jid = option; 1011 break; 1012 case Opt_id: 1013 case Opt_nodir: 1014 /* Obsolete, but left for backward compat purposes */ 1015 break; 1016 case Opt_first: 1017 ret = match_int(&tmp[0], &option); 1018 if (ret || (option != 0 && option != 1)) 1019 goto hostdata_error; 1020 ls->ls_first = option; 1021 break; 1022 case Opt_err: 1023 default: 1024 hostdata_error: 1025 fs_info(sdp, "unknown hostdata (%s)\n", o); 1026 return -EINVAL; 1027 } 1028 } 1029 1030 if (lm->lm_mount == NULL) { 1031 fs_info(sdp, "Now mounting FS...\n"); 1032 complete_all(&sdp->sd_locking_init); 1033 return 0; 1034 } 1035 ret = lm->lm_mount(sdp, table); 1036 if (ret == 0) 1037 fs_info(sdp, "Joined cluster. Now mounting FS...\n"); 1038 complete_all(&sdp->sd_locking_init); 1039 return ret; 1040 } 1041 1042 void gfs2_lm_unmount(struct gfs2_sbd *sdp) 1043 { 1044 const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops; 1045 if (likely(!gfs2_withdrawn(sdp)) && lm->lm_unmount) 1046 lm->lm_unmount(sdp); 1047 } 1048 1049 static int wait_on_journal(struct gfs2_sbd *sdp) 1050 { 1051 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL) 1052 return 0; 1053 1054 return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, TASK_INTERRUPTIBLE) 1055 ? -EINTR : 0; 1056 } 1057 1058 void gfs2_online_uevent(struct gfs2_sbd *sdp) 1059 { 1060 struct super_block *sb = sdp->sd_vfs; 1061 char ro[20]; 1062 char spectator[20]; 1063 char *envp[] = { ro, spectator, NULL }; 1064 sprintf(ro, "RDONLY=%d", sb_rdonly(sb)); 1065 sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0); 1066 kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp); 1067 } 1068 1069 /** 1070 * gfs2_fill_super - Read in superblock 1071 * @sb: The VFS superblock 1072 * @args: Mount options 1073 * @silent: Don't complain if it's not a GFS2 filesystem 1074 * 1075 * Returns: -errno 1076 */ 1077 static int gfs2_fill_super(struct super_block *sb, struct fs_context *fc) 1078 { 1079 struct gfs2_args *args = fc->fs_private; 1080 int silent = fc->sb_flags & SB_SILENT; 1081 struct gfs2_sbd *sdp; 1082 struct gfs2_holder mount_gh; 1083 int error; 1084 1085 sdp = init_sbd(sb); 1086 if (!sdp) { 1087 pr_warn("can't alloc struct gfs2_sbd\n"); 1088 return -ENOMEM; 1089 } 1090 sdp->sd_args = *args; 1091 1092 if (sdp->sd_args.ar_spectator) { 1093 sb->s_flags |= SB_RDONLY; 1094 set_bit(SDF_RORECOVERY, &sdp->sd_flags); 1095 } 1096 if (sdp->sd_args.ar_posix_acl) 1097 sb->s_flags |= SB_POSIXACL; 1098 if (sdp->sd_args.ar_nobarrier) 1099 set_bit(SDF_NOBARRIERS, &sdp->sd_flags); 1100 1101 sb->s_flags |= SB_NOSEC; 1102 sb->s_magic = GFS2_MAGIC; 1103 sb->s_op = &gfs2_super_ops; 1104 sb->s_d_op = &gfs2_dops; 1105 sb->s_export_op = &gfs2_export_ops; 1106 sb->s_xattr = gfs2_xattr_handlers; 1107 sb->s_qcop = &gfs2_quotactl_ops; 1108 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; 1109 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE; 1110 sb->s_time_gran = 1; 1111 sb->s_maxbytes = MAX_LFS_FILESIZE; 1112 1113 /* Set up the buffer cache and fill in some fake block size values 1114 to allow us to read-in the on-disk superblock. */ 1115 sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK); 1116 sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits; 1117 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift - 1118 GFS2_BASIC_BLOCK_SHIFT; 1119 sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift); 1120 1121 sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit; 1122 sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum; 1123 if (sdp->sd_args.ar_statfs_quantum) { 1124 sdp->sd_tune.gt_statfs_slow = 0; 1125 sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum; 1126 } else { 1127 sdp->sd_tune.gt_statfs_slow = 1; 1128 sdp->sd_tune.gt_statfs_quantum = 30; 1129 } 1130 1131 error = init_names(sdp, silent); 1132 if (error) 1133 goto fail_free; 1134 1135 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s", sdp->sd_table_name); 1136 1137 error = gfs2_sys_fs_add(sdp); 1138 if (error) 1139 goto fail_free; 1140 1141 gfs2_create_debugfs_file(sdp); 1142 1143 error = gfs2_lm_mount(sdp, silent); 1144 if (error) 1145 goto fail_debug; 1146 1147 error = init_locking(sdp, &mount_gh, DO); 1148 if (error) 1149 goto fail_lm; 1150 1151 error = init_sb(sdp, silent); 1152 if (error) 1153 goto fail_locking; 1154 1155 error = wait_on_journal(sdp); 1156 if (error) 1157 goto fail_sb; 1158 1159 /* 1160 * If user space has failed to join the cluster or some similar 1161 * failure has occurred, then the journal id will contain a 1162 * negative (error) number. This will then be returned to the 1163 * caller (of the mount syscall). We do this even for spectator 1164 * mounts (which just write a jid of 0 to indicate "ok" even though 1165 * the jid is unused in the spectator case) 1166 */ 1167 if (sdp->sd_lockstruct.ls_jid < 0) { 1168 error = sdp->sd_lockstruct.ls_jid; 1169 sdp->sd_lockstruct.ls_jid = 0; 1170 goto fail_sb; 1171 } 1172 1173 if (sdp->sd_args.ar_spectator) 1174 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.s", 1175 sdp->sd_table_name); 1176 else 1177 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.%u", 1178 sdp->sd_table_name, sdp->sd_lockstruct.ls_jid); 1179 1180 error = init_inodes(sdp, DO); 1181 if (error) 1182 goto fail_sb; 1183 1184 error = init_per_node(sdp, DO); 1185 if (error) 1186 goto fail_inodes; 1187 1188 error = gfs2_statfs_init(sdp); 1189 if (error) { 1190 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error); 1191 goto fail_per_node; 1192 } 1193 1194 if (sb_rdonly(sb)) { 1195 struct gfs2_holder freeze_gh; 1196 1197 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, 1198 LM_FLAG_NOEXP | GL_EXACT, 1199 &freeze_gh); 1200 if (error) { 1201 fs_err(sdp, "can't make FS RO: %d\n", error); 1202 goto fail_per_node; 1203 } 1204 gfs2_glock_dq_uninit(&freeze_gh); 1205 } else { 1206 error = gfs2_make_fs_rw(sdp); 1207 if (error) { 1208 fs_err(sdp, "can't make FS RW: %d\n", error); 1209 goto fail_per_node; 1210 } 1211 } 1212 1213 gfs2_glock_dq_uninit(&mount_gh); 1214 gfs2_online_uevent(sdp); 1215 return 0; 1216 1217 fail_per_node: 1218 init_per_node(sdp, UNDO); 1219 fail_inodes: 1220 init_inodes(sdp, UNDO); 1221 fail_sb: 1222 if (sdp->sd_root_dir) 1223 dput(sdp->sd_root_dir); 1224 if (sdp->sd_master_dir) 1225 dput(sdp->sd_master_dir); 1226 if (sb->s_root) 1227 dput(sb->s_root); 1228 sb->s_root = NULL; 1229 fail_locking: 1230 init_locking(sdp, &mount_gh, UNDO); 1231 fail_lm: 1232 complete_all(&sdp->sd_journal_ready); 1233 gfs2_gl_hash_clear(sdp); 1234 gfs2_lm_unmount(sdp); 1235 fail_debug: 1236 gfs2_delete_debugfs_file(sdp); 1237 gfs2_sys_fs_del(sdp); 1238 fail_free: 1239 free_sbd(sdp); 1240 sb->s_fs_info = NULL; 1241 return error; 1242 } 1243 1244 /** 1245 * gfs2_get_tree - Get the GFS2 superblock and root directory 1246 * @fc: The filesystem context 1247 * 1248 * Returns: 0 or -errno on error 1249 */ 1250 static int gfs2_get_tree(struct fs_context *fc) 1251 { 1252 struct gfs2_args *args = fc->fs_private; 1253 struct gfs2_sbd *sdp; 1254 int error; 1255 1256 error = get_tree_bdev(fc, gfs2_fill_super); 1257 if (error) 1258 return error; 1259 1260 sdp = fc->root->d_sb->s_fs_info; 1261 dput(fc->root); 1262 if (args->ar_meta) 1263 fc->root = dget(sdp->sd_master_dir); 1264 else 1265 fc->root = dget(sdp->sd_root_dir); 1266 return 0; 1267 } 1268 1269 static void gfs2_fc_free(struct fs_context *fc) 1270 { 1271 struct gfs2_args *args = fc->fs_private; 1272 1273 kfree(args); 1274 } 1275 1276 enum gfs2_param { 1277 Opt_lockproto, 1278 Opt_locktable, 1279 Opt_hostdata, 1280 Opt_spectator, 1281 Opt_ignore_local_fs, 1282 Opt_localflocks, 1283 Opt_localcaching, 1284 Opt_debug, 1285 Opt_upgrade, 1286 Opt_acl, 1287 Opt_quota, 1288 Opt_quota_flag, 1289 Opt_suiddir, 1290 Opt_data, 1291 Opt_meta, 1292 Opt_discard, 1293 Opt_commit, 1294 Opt_errors, 1295 Opt_statfs_quantum, 1296 Opt_statfs_percent, 1297 Opt_quota_quantum, 1298 Opt_barrier, 1299 Opt_rgrplvb, 1300 Opt_loccookie, 1301 }; 1302 1303 static const struct constant_table gfs2_param_quota[] = { 1304 {"off", GFS2_QUOTA_OFF}, 1305 {"account", GFS2_QUOTA_ACCOUNT}, 1306 {"on", GFS2_QUOTA_ON}, 1307 {} 1308 }; 1309 1310 enum opt_data { 1311 Opt_data_writeback = GFS2_DATA_WRITEBACK, 1312 Opt_data_ordered = GFS2_DATA_ORDERED, 1313 }; 1314 1315 static const struct constant_table gfs2_param_data[] = { 1316 {"writeback", Opt_data_writeback }, 1317 {"ordered", Opt_data_ordered }, 1318 {} 1319 }; 1320 1321 enum opt_errors { 1322 Opt_errors_withdraw = GFS2_ERRORS_WITHDRAW, 1323 Opt_errors_panic = GFS2_ERRORS_PANIC, 1324 }; 1325 1326 static const struct constant_table gfs2_param_errors[] = { 1327 {"withdraw", Opt_errors_withdraw }, 1328 {"panic", Opt_errors_panic }, 1329 {} 1330 }; 1331 1332 static const struct fs_parameter_spec gfs2_fs_parameters[] = { 1333 fsparam_string ("lockproto", Opt_lockproto), 1334 fsparam_string ("locktable", Opt_locktable), 1335 fsparam_string ("hostdata", Opt_hostdata), 1336 fsparam_flag ("spectator", Opt_spectator), 1337 fsparam_flag ("norecovery", Opt_spectator), 1338 fsparam_flag ("ignore_local_fs", Opt_ignore_local_fs), 1339 fsparam_flag ("localflocks", Opt_localflocks), 1340 fsparam_flag ("localcaching", Opt_localcaching), 1341 fsparam_flag_no("debug", Opt_debug), 1342 fsparam_flag ("upgrade", Opt_upgrade), 1343 fsparam_flag_no("acl", Opt_acl), 1344 fsparam_flag_no("suiddir", Opt_suiddir), 1345 fsparam_enum ("data", Opt_data, gfs2_param_data), 1346 fsparam_flag ("meta", Opt_meta), 1347 fsparam_flag_no("discard", Opt_discard), 1348 fsparam_s32 ("commit", Opt_commit), 1349 fsparam_enum ("errors", Opt_errors, gfs2_param_errors), 1350 fsparam_s32 ("statfs_quantum", Opt_statfs_quantum), 1351 fsparam_s32 ("statfs_percent", Opt_statfs_percent), 1352 fsparam_s32 ("quota_quantum", Opt_quota_quantum), 1353 fsparam_flag_no("barrier", Opt_barrier), 1354 fsparam_flag_no("rgrplvb", Opt_rgrplvb), 1355 fsparam_flag_no("loccookie", Opt_loccookie), 1356 /* quota can be a flag or an enum so it gets special treatment */ 1357 fsparam_flag_no("quota", Opt_quota_flag), 1358 fsparam_enum("quota", Opt_quota, gfs2_param_quota), 1359 {} 1360 }; 1361 1362 /* Parse a single mount parameter */ 1363 static int gfs2_parse_param(struct fs_context *fc, struct fs_parameter *param) 1364 { 1365 struct gfs2_args *args = fc->fs_private; 1366 struct fs_parse_result result; 1367 int o; 1368 1369 o = fs_parse(fc, gfs2_fs_parameters, param, &result); 1370 if (o < 0) 1371 return o; 1372 1373 switch (o) { 1374 case Opt_lockproto: 1375 strlcpy(args->ar_lockproto, param->string, GFS2_LOCKNAME_LEN); 1376 break; 1377 case Opt_locktable: 1378 strlcpy(args->ar_locktable, param->string, GFS2_LOCKNAME_LEN); 1379 break; 1380 case Opt_hostdata: 1381 strlcpy(args->ar_hostdata, param->string, GFS2_LOCKNAME_LEN); 1382 break; 1383 case Opt_spectator: 1384 args->ar_spectator = 1; 1385 break; 1386 case Opt_ignore_local_fs: 1387 /* Retained for backwards compat only */ 1388 break; 1389 case Opt_localflocks: 1390 args->ar_localflocks = 1; 1391 break; 1392 case Opt_localcaching: 1393 /* Retained for backwards compat only */ 1394 break; 1395 case Opt_debug: 1396 if (result.boolean && args->ar_errors == GFS2_ERRORS_PANIC) 1397 return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive"); 1398 args->ar_debug = result.boolean; 1399 break; 1400 case Opt_upgrade: 1401 /* Retained for backwards compat only */ 1402 break; 1403 case Opt_acl: 1404 args->ar_posix_acl = result.boolean; 1405 break; 1406 case Opt_quota_flag: 1407 args->ar_quota = result.negated ? GFS2_QUOTA_OFF : GFS2_QUOTA_ON; 1408 break; 1409 case Opt_quota: 1410 args->ar_quota = result.int_32; 1411 break; 1412 case Opt_suiddir: 1413 args->ar_suiddir = result.boolean; 1414 break; 1415 case Opt_data: 1416 /* The uint_32 result maps directly to GFS2_DATA_* */ 1417 args->ar_data = result.uint_32; 1418 break; 1419 case Opt_meta: 1420 args->ar_meta = 1; 1421 break; 1422 case Opt_discard: 1423 args->ar_discard = result.boolean; 1424 break; 1425 case Opt_commit: 1426 if (result.int_32 <= 0) 1427 return invalfc(fc, "commit mount option requires a positive numeric argument"); 1428 args->ar_commit = result.int_32; 1429 break; 1430 case Opt_statfs_quantum: 1431 if (result.int_32 < 0) 1432 return invalfc(fc, "statfs_quantum mount option requires a non-negative numeric argument"); 1433 args->ar_statfs_quantum = result.int_32; 1434 break; 1435 case Opt_quota_quantum: 1436 if (result.int_32 <= 0) 1437 return invalfc(fc, "quota_quantum mount option requires a positive numeric argument"); 1438 args->ar_quota_quantum = result.int_32; 1439 break; 1440 case Opt_statfs_percent: 1441 if (result.int_32 < 0 || result.int_32 > 100) 1442 return invalfc(fc, "statfs_percent mount option requires a numeric argument between 0 and 100"); 1443 args->ar_statfs_percent = result.int_32; 1444 break; 1445 case Opt_errors: 1446 if (args->ar_debug && result.uint_32 == GFS2_ERRORS_PANIC) 1447 return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive"); 1448 args->ar_errors = result.uint_32; 1449 break; 1450 case Opt_barrier: 1451 args->ar_nobarrier = result.boolean; 1452 break; 1453 case Opt_rgrplvb: 1454 args->ar_rgrplvb = result.boolean; 1455 break; 1456 case Opt_loccookie: 1457 args->ar_loccookie = result.boolean; 1458 break; 1459 default: 1460 return invalfc(fc, "invalid mount option: %s", param->key); 1461 } 1462 return 0; 1463 } 1464 1465 static int gfs2_reconfigure(struct fs_context *fc) 1466 { 1467 struct super_block *sb = fc->root->d_sb; 1468 struct gfs2_sbd *sdp = sb->s_fs_info; 1469 struct gfs2_args *oldargs = &sdp->sd_args; 1470 struct gfs2_args *newargs = fc->fs_private; 1471 struct gfs2_tune *gt = &sdp->sd_tune; 1472 int error = 0; 1473 1474 sync_filesystem(sb); 1475 1476 spin_lock(>->gt_spin); 1477 oldargs->ar_commit = gt->gt_logd_secs; 1478 oldargs->ar_quota_quantum = gt->gt_quota_quantum; 1479 if (gt->gt_statfs_slow) 1480 oldargs->ar_statfs_quantum = 0; 1481 else 1482 oldargs->ar_statfs_quantum = gt->gt_statfs_quantum; 1483 spin_unlock(>->gt_spin); 1484 1485 if (strcmp(newargs->ar_lockproto, oldargs->ar_lockproto)) { 1486 errorfc(fc, "reconfiguration of locking protocol not allowed"); 1487 return -EINVAL; 1488 } 1489 if (strcmp(newargs->ar_locktable, oldargs->ar_locktable)) { 1490 errorfc(fc, "reconfiguration of lock table not allowed"); 1491 return -EINVAL; 1492 } 1493 if (strcmp(newargs->ar_hostdata, oldargs->ar_hostdata)) { 1494 errorfc(fc, "reconfiguration of host data not allowed"); 1495 return -EINVAL; 1496 } 1497 if (newargs->ar_spectator != oldargs->ar_spectator) { 1498 errorfc(fc, "reconfiguration of spectator mode not allowed"); 1499 return -EINVAL; 1500 } 1501 if (newargs->ar_localflocks != oldargs->ar_localflocks) { 1502 errorfc(fc, "reconfiguration of localflocks not allowed"); 1503 return -EINVAL; 1504 } 1505 if (newargs->ar_meta != oldargs->ar_meta) { 1506 errorfc(fc, "switching between gfs2 and gfs2meta not allowed"); 1507 return -EINVAL; 1508 } 1509 if (oldargs->ar_spectator) 1510 fc->sb_flags |= SB_RDONLY; 1511 1512 if ((sb->s_flags ^ fc->sb_flags) & SB_RDONLY) { 1513 if (fc->sb_flags & SB_RDONLY) { 1514 error = gfs2_make_fs_ro(sdp); 1515 if (error) 1516 errorfc(fc, "unable to remount read-only"); 1517 } else { 1518 error = gfs2_make_fs_rw(sdp); 1519 if (error) 1520 errorfc(fc, "unable to remount read-write"); 1521 } 1522 } 1523 sdp->sd_args = *newargs; 1524 1525 if (sdp->sd_args.ar_posix_acl) 1526 sb->s_flags |= SB_POSIXACL; 1527 else 1528 sb->s_flags &= ~SB_POSIXACL; 1529 if (sdp->sd_args.ar_nobarrier) 1530 set_bit(SDF_NOBARRIERS, &sdp->sd_flags); 1531 else 1532 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags); 1533 spin_lock(>->gt_spin); 1534 gt->gt_logd_secs = newargs->ar_commit; 1535 gt->gt_quota_quantum = newargs->ar_quota_quantum; 1536 if (newargs->ar_statfs_quantum) { 1537 gt->gt_statfs_slow = 0; 1538 gt->gt_statfs_quantum = newargs->ar_statfs_quantum; 1539 } 1540 else { 1541 gt->gt_statfs_slow = 1; 1542 gt->gt_statfs_quantum = 30; 1543 } 1544 spin_unlock(>->gt_spin); 1545 1546 gfs2_online_uevent(sdp); 1547 return error; 1548 } 1549 1550 static const struct fs_context_operations gfs2_context_ops = { 1551 .free = gfs2_fc_free, 1552 .parse_param = gfs2_parse_param, 1553 .get_tree = gfs2_get_tree, 1554 .reconfigure = gfs2_reconfigure, 1555 }; 1556 1557 /* Set up the filesystem mount context */ 1558 static int gfs2_init_fs_context(struct fs_context *fc) 1559 { 1560 struct gfs2_args *args; 1561 1562 args = kmalloc(sizeof(*args), GFP_KERNEL); 1563 if (args == NULL) 1564 return -ENOMEM; 1565 1566 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) { 1567 struct gfs2_sbd *sdp = fc->root->d_sb->s_fs_info; 1568 1569 *args = sdp->sd_args; 1570 } else { 1571 memset(args, 0, sizeof(*args)); 1572 args->ar_quota = GFS2_QUOTA_DEFAULT; 1573 args->ar_data = GFS2_DATA_DEFAULT; 1574 args->ar_commit = 30; 1575 args->ar_statfs_quantum = 30; 1576 args->ar_quota_quantum = 60; 1577 args->ar_errors = GFS2_ERRORS_DEFAULT; 1578 } 1579 fc->fs_private = args; 1580 fc->ops = &gfs2_context_ops; 1581 return 0; 1582 } 1583 1584 static int set_meta_super(struct super_block *s, struct fs_context *fc) 1585 { 1586 return -EINVAL; 1587 } 1588 1589 static int test_meta_super(struct super_block *s, struct fs_context *fc) 1590 { 1591 return (fc->sget_key == s->s_bdev); 1592 } 1593 1594 static int gfs2_meta_get_tree(struct fs_context *fc) 1595 { 1596 struct super_block *s; 1597 struct gfs2_sbd *sdp; 1598 struct path path; 1599 int error; 1600 1601 if (!fc->source || !*fc->source) 1602 return -EINVAL; 1603 1604 error = kern_path(fc->source, LOOKUP_FOLLOW, &path); 1605 if (error) { 1606 pr_warn("path_lookup on %s returned error %d\n", 1607 fc->source, error); 1608 return error; 1609 } 1610 fc->fs_type = &gfs2_fs_type; 1611 fc->sget_key = path.dentry->d_sb->s_bdev; 1612 s = sget_fc(fc, test_meta_super, set_meta_super); 1613 path_put(&path); 1614 if (IS_ERR(s)) { 1615 pr_warn("gfs2 mount does not exist\n"); 1616 return PTR_ERR(s); 1617 } 1618 if ((fc->sb_flags ^ s->s_flags) & SB_RDONLY) { 1619 deactivate_locked_super(s); 1620 return -EBUSY; 1621 } 1622 sdp = s->s_fs_info; 1623 fc->root = dget(sdp->sd_master_dir); 1624 return 0; 1625 } 1626 1627 static const struct fs_context_operations gfs2_meta_context_ops = { 1628 .free = gfs2_fc_free, 1629 .get_tree = gfs2_meta_get_tree, 1630 }; 1631 1632 static int gfs2_meta_init_fs_context(struct fs_context *fc) 1633 { 1634 int ret = gfs2_init_fs_context(fc); 1635 1636 if (ret) 1637 return ret; 1638 1639 fc->ops = &gfs2_meta_context_ops; 1640 return 0; 1641 } 1642 1643 static void gfs2_kill_sb(struct super_block *sb) 1644 { 1645 struct gfs2_sbd *sdp = sb->s_fs_info; 1646 1647 if (sdp == NULL) { 1648 kill_block_super(sb); 1649 return; 1650 } 1651 1652 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SYNC | GFS2_LFC_KILL_SB); 1653 dput(sdp->sd_root_dir); 1654 dput(sdp->sd_master_dir); 1655 sdp->sd_root_dir = NULL; 1656 sdp->sd_master_dir = NULL; 1657 shrink_dcache_sb(sb); 1658 kill_block_super(sb); 1659 } 1660 1661 struct file_system_type gfs2_fs_type = { 1662 .name = "gfs2", 1663 .fs_flags = FS_REQUIRES_DEV, 1664 .init_fs_context = gfs2_init_fs_context, 1665 .parameters = gfs2_fs_parameters, 1666 .kill_sb = gfs2_kill_sb, 1667 .owner = THIS_MODULE, 1668 }; 1669 MODULE_ALIAS_FS("gfs2"); 1670 1671 struct file_system_type gfs2meta_fs_type = { 1672 .name = "gfs2meta", 1673 .fs_flags = FS_REQUIRES_DEV, 1674 .init_fs_context = gfs2_meta_init_fs_context, 1675 .owner = THIS_MODULE, 1676 }; 1677 MODULE_ALIAS_FS("gfs2meta"); 1678