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 out; 637 } 638 if (sdp->sd_args.ar_spectator) 639 goto out; 640 641 pn = gfs2_lookup_simple(master, "per_node"); 642 if (IS_ERR(pn)) { 643 error = PTR_ERR(pn); 644 fs_err(sdp, "can't find per_node directory: %d\n", error); 645 goto put_statfs; 646 } 647 648 /* For each jid, lookup the corresponding local statfs inode in the 649 * per_node metafs directory and save it in the sdp->sd_sc_inodes_list. */ 650 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { 651 struct local_statfs_inode *lsi = 652 kmalloc(sizeof(struct local_statfs_inode), GFP_NOFS); 653 if (!lsi) { 654 error = -ENOMEM; 655 goto free_local; 656 } 657 sprintf(buf, "statfs_change%u", jd->jd_jid); 658 lsi->si_sc_inode = gfs2_lookup_simple(pn, buf); 659 if (IS_ERR(lsi->si_sc_inode)) { 660 error = PTR_ERR(lsi->si_sc_inode); 661 fs_err(sdp, "can't find local \"sc\" file#%u: %d\n", 662 jd->jd_jid, error); 663 goto free_local; 664 } 665 lsi->si_jid = jd->jd_jid; 666 if (jd->jd_jid == sdp->sd_jdesc->jd_jid) 667 sdp->sd_sc_inode = lsi->si_sc_inode; 668 669 list_add_tail(&lsi->si_list, &sdp->sd_sc_inodes_list); 670 } 671 672 iput(pn); 673 ip = GFS2_I(sdp->sd_sc_inode); 674 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, 675 &sdp->sd_sc_gh); 676 if (error) { 677 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error); 678 goto free_local; 679 } 680 return 0; 681 682 free_local: 683 free_local_statfs_inodes(sdp); 684 iput(pn); 685 put_statfs: 686 iput(sdp->sd_statfs_inode); 687 out: 688 return error; 689 } 690 691 /* Uninitialize and free up memory used by the list of statfs inodes */ 692 static void uninit_statfs(struct gfs2_sbd *sdp) 693 { 694 if (!sdp->sd_args.ar_spectator) { 695 gfs2_glock_dq_uninit(&sdp->sd_sc_gh); 696 free_local_statfs_inodes(sdp); 697 } 698 iput(sdp->sd_statfs_inode); 699 } 700 701 static int init_journal(struct gfs2_sbd *sdp, int undo) 702 { 703 struct inode *master = d_inode(sdp->sd_master_dir); 704 struct gfs2_holder ji_gh; 705 struct gfs2_inode *ip; 706 int jindex = 1; 707 int error = 0; 708 709 if (undo) { 710 jindex = 0; 711 goto fail_statfs; 712 } 713 714 sdp->sd_jindex = gfs2_lookup_simple(master, "jindex"); 715 if (IS_ERR(sdp->sd_jindex)) { 716 fs_err(sdp, "can't lookup journal index: %d\n", error); 717 return PTR_ERR(sdp->sd_jindex); 718 } 719 720 /* Load in the journal index special file */ 721 722 error = gfs2_jindex_hold(sdp, &ji_gh); 723 if (error) { 724 fs_err(sdp, "can't read journal index: %d\n", error); 725 goto fail; 726 } 727 728 error = -EUSERS; 729 if (!gfs2_jindex_size(sdp)) { 730 fs_err(sdp, "no journals!\n"); 731 goto fail_jindex; 732 } 733 734 atomic_set(&sdp->sd_log_blks_needed, 0); 735 if (sdp->sd_args.ar_spectator) { 736 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0); 737 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks); 738 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5); 739 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5); 740 } else { 741 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) { 742 fs_err(sdp, "can't mount journal #%u\n", 743 sdp->sd_lockstruct.ls_jid); 744 fs_err(sdp, "there are only %u journals (0 - %u)\n", 745 gfs2_jindex_size(sdp), 746 gfs2_jindex_size(sdp) - 1); 747 goto fail_jindex; 748 } 749 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid); 750 751 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid, 752 &gfs2_journal_glops, 753 LM_ST_EXCLUSIVE, 754 LM_FLAG_NOEXP | GL_NOCACHE, 755 &sdp->sd_journal_gh); 756 if (error) { 757 fs_err(sdp, "can't acquire journal glock: %d\n", error); 758 goto fail_jindex; 759 } 760 761 ip = GFS2_I(sdp->sd_jdesc->jd_inode); 762 sdp->sd_jinode_gl = ip->i_gl; 763 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 764 LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE, 765 &sdp->sd_jinode_gh); 766 if (error) { 767 fs_err(sdp, "can't acquire journal inode glock: %d\n", 768 error); 769 goto fail_journal_gh; 770 } 771 772 error = gfs2_jdesc_check(sdp->sd_jdesc); 773 if (error) { 774 fs_err(sdp, "my journal (%u) is bad: %d\n", 775 sdp->sd_jdesc->jd_jid, error); 776 goto fail_jinode_gh; 777 } 778 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks); 779 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5); 780 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5); 781 782 /* Map the extents for this journal's blocks */ 783 gfs2_map_journal_extents(sdp, sdp->sd_jdesc); 784 } 785 trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free)); 786 787 /* Lookup statfs inodes here so journal recovery can use them. */ 788 error = init_statfs(sdp); 789 if (error) 790 goto fail_jinode_gh; 791 792 if (sdp->sd_lockstruct.ls_first) { 793 unsigned int x; 794 for (x = 0; x < sdp->sd_journals; x++) { 795 struct gfs2_jdesc *jd = gfs2_jdesc_find(sdp, x); 796 797 if (sdp->sd_args.ar_spectator) { 798 error = check_journal_clean(sdp, jd, true); 799 if (error) 800 goto fail_statfs; 801 continue; 802 } 803 error = gfs2_recover_journal(jd, true); 804 if (error) { 805 fs_err(sdp, "error recovering journal %u: %d\n", 806 x, error); 807 goto fail_statfs; 808 } 809 } 810 811 gfs2_others_may_mount(sdp); 812 } else if (!sdp->sd_args.ar_spectator) { 813 error = gfs2_recover_journal(sdp->sd_jdesc, true); 814 if (error) { 815 fs_err(sdp, "error recovering my journal: %d\n", error); 816 goto fail_statfs; 817 } 818 } 819 820 sdp->sd_log_idle = 1; 821 set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags); 822 gfs2_glock_dq_uninit(&ji_gh); 823 jindex = 0; 824 INIT_WORK(&sdp->sd_freeze_work, gfs2_freeze_func); 825 return 0; 826 827 fail_statfs: 828 uninit_statfs(sdp); 829 fail_jinode_gh: 830 /* A withdraw may have done dq/uninit so now we need to check it */ 831 if (!sdp->sd_args.ar_spectator && 832 gfs2_holder_initialized(&sdp->sd_jinode_gh)) 833 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh); 834 fail_journal_gh: 835 if (!sdp->sd_args.ar_spectator && 836 gfs2_holder_initialized(&sdp->sd_journal_gh)) 837 gfs2_glock_dq_uninit(&sdp->sd_journal_gh); 838 fail_jindex: 839 gfs2_jindex_free(sdp); 840 if (jindex) 841 gfs2_glock_dq_uninit(&ji_gh); 842 fail: 843 iput(sdp->sd_jindex); 844 return error; 845 } 846 847 static struct lock_class_key gfs2_quota_imutex_key; 848 849 static int init_inodes(struct gfs2_sbd *sdp, int undo) 850 { 851 int error = 0; 852 struct inode *master = d_inode(sdp->sd_master_dir); 853 854 if (undo) 855 goto fail_qinode; 856 857 error = init_journal(sdp, undo); 858 complete_all(&sdp->sd_journal_ready); 859 if (error) 860 goto fail; 861 862 /* Read in the resource index inode */ 863 sdp->sd_rindex = gfs2_lookup_simple(master, "rindex"); 864 if (IS_ERR(sdp->sd_rindex)) { 865 error = PTR_ERR(sdp->sd_rindex); 866 fs_err(sdp, "can't get resource index inode: %d\n", error); 867 goto fail_journal; 868 } 869 sdp->sd_rindex_uptodate = 0; 870 871 /* Read in the quota inode */ 872 sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota"); 873 if (IS_ERR(sdp->sd_quota_inode)) { 874 error = PTR_ERR(sdp->sd_quota_inode); 875 fs_err(sdp, "can't get quota file inode: %d\n", error); 876 goto fail_rindex; 877 } 878 /* 879 * i_rwsem on quota files is special. Since this inode is hidden system 880 * file, we are safe to define locking ourselves. 881 */ 882 lockdep_set_class(&sdp->sd_quota_inode->i_rwsem, 883 &gfs2_quota_imutex_key); 884 885 error = gfs2_rindex_update(sdp); 886 if (error) 887 goto fail_qinode; 888 889 return 0; 890 891 fail_qinode: 892 iput(sdp->sd_quota_inode); 893 fail_rindex: 894 gfs2_clear_rgrpd(sdp); 895 iput(sdp->sd_rindex); 896 fail_journal: 897 init_journal(sdp, UNDO); 898 fail: 899 return error; 900 } 901 902 static int init_per_node(struct gfs2_sbd *sdp, int undo) 903 { 904 struct inode *pn = NULL; 905 char buf[30]; 906 int error = 0; 907 struct gfs2_inode *ip; 908 struct inode *master = d_inode(sdp->sd_master_dir); 909 910 if (sdp->sd_args.ar_spectator) 911 return 0; 912 913 if (undo) 914 goto fail_qc_gh; 915 916 pn = gfs2_lookup_simple(master, "per_node"); 917 if (IS_ERR(pn)) { 918 error = PTR_ERR(pn); 919 fs_err(sdp, "can't find per_node directory: %d\n", error); 920 return error; 921 } 922 923 sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid); 924 sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf); 925 if (IS_ERR(sdp->sd_qc_inode)) { 926 error = PTR_ERR(sdp->sd_qc_inode); 927 fs_err(sdp, "can't find local \"qc\" file: %d\n", error); 928 goto fail_ut_i; 929 } 930 931 iput(pn); 932 pn = NULL; 933 934 ip = GFS2_I(sdp->sd_qc_inode); 935 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, 936 &sdp->sd_qc_gh); 937 if (error) { 938 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error); 939 goto fail_qc_i; 940 } 941 942 return 0; 943 944 fail_qc_gh: 945 gfs2_glock_dq_uninit(&sdp->sd_qc_gh); 946 fail_qc_i: 947 iput(sdp->sd_qc_inode); 948 fail_ut_i: 949 iput(pn); 950 return error; 951 } 952 953 static const match_table_t nolock_tokens = { 954 { Opt_jid, "jid=%d", }, 955 { Opt_err, NULL }, 956 }; 957 958 static const struct lm_lockops nolock_ops = { 959 .lm_proto_name = "lock_nolock", 960 .lm_put_lock = gfs2_glock_free, 961 .lm_tokens = &nolock_tokens, 962 }; 963 964 /** 965 * gfs2_lm_mount - mount a locking protocol 966 * @sdp: the filesystem 967 * @args: mount arguments 968 * @silent: if 1, don't complain if the FS isn't a GFS2 fs 969 * 970 * Returns: errno 971 */ 972 973 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent) 974 { 975 const struct lm_lockops *lm; 976 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 977 struct gfs2_args *args = &sdp->sd_args; 978 const char *proto = sdp->sd_proto_name; 979 const char *table = sdp->sd_table_name; 980 char *o, *options; 981 int ret; 982 983 if (!strcmp("lock_nolock", proto)) { 984 lm = &nolock_ops; 985 sdp->sd_args.ar_localflocks = 1; 986 #ifdef CONFIG_GFS2_FS_LOCKING_DLM 987 } else if (!strcmp("lock_dlm", proto)) { 988 lm = &gfs2_dlm_ops; 989 #endif 990 } else { 991 pr_info("can't find protocol %s\n", proto); 992 return -ENOENT; 993 } 994 995 fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table); 996 997 ls->ls_ops = lm; 998 ls->ls_first = 1; 999 1000 for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) { 1001 substring_t tmp[MAX_OPT_ARGS]; 1002 int token, option; 1003 1004 if (!o || !*o) 1005 continue; 1006 1007 token = match_token(o, *lm->lm_tokens, tmp); 1008 switch (token) { 1009 case Opt_jid: 1010 ret = match_int(&tmp[0], &option); 1011 if (ret || option < 0) 1012 goto hostdata_error; 1013 if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags)) 1014 ls->ls_jid = option; 1015 break; 1016 case Opt_id: 1017 case Opt_nodir: 1018 /* Obsolete, but left for backward compat purposes */ 1019 break; 1020 case Opt_first: 1021 ret = match_int(&tmp[0], &option); 1022 if (ret || (option != 0 && option != 1)) 1023 goto hostdata_error; 1024 ls->ls_first = option; 1025 break; 1026 case Opt_err: 1027 default: 1028 hostdata_error: 1029 fs_info(sdp, "unknown hostdata (%s)\n", o); 1030 return -EINVAL; 1031 } 1032 } 1033 1034 if (lm->lm_mount == NULL) { 1035 fs_info(sdp, "Now mounting FS...\n"); 1036 complete_all(&sdp->sd_locking_init); 1037 return 0; 1038 } 1039 ret = lm->lm_mount(sdp, table); 1040 if (ret == 0) 1041 fs_info(sdp, "Joined cluster. Now mounting FS...\n"); 1042 complete_all(&sdp->sd_locking_init); 1043 return ret; 1044 } 1045 1046 void gfs2_lm_unmount(struct gfs2_sbd *sdp) 1047 { 1048 const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops; 1049 if (likely(!gfs2_withdrawn(sdp)) && lm->lm_unmount) 1050 lm->lm_unmount(sdp); 1051 } 1052 1053 static int wait_on_journal(struct gfs2_sbd *sdp) 1054 { 1055 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL) 1056 return 0; 1057 1058 return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, TASK_INTERRUPTIBLE) 1059 ? -EINTR : 0; 1060 } 1061 1062 void gfs2_online_uevent(struct gfs2_sbd *sdp) 1063 { 1064 struct super_block *sb = sdp->sd_vfs; 1065 char ro[20]; 1066 char spectator[20]; 1067 char *envp[] = { ro, spectator, NULL }; 1068 sprintf(ro, "RDONLY=%d", sb_rdonly(sb)); 1069 sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0); 1070 kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp); 1071 } 1072 1073 /** 1074 * gfs2_fill_super - Read in superblock 1075 * @sb: The VFS superblock 1076 * @args: Mount options 1077 * @silent: Don't complain if it's not a GFS2 filesystem 1078 * 1079 * Returns: -errno 1080 */ 1081 static int gfs2_fill_super(struct super_block *sb, struct fs_context *fc) 1082 { 1083 struct gfs2_args *args = fc->fs_private; 1084 int silent = fc->sb_flags & SB_SILENT; 1085 struct gfs2_sbd *sdp; 1086 struct gfs2_holder mount_gh; 1087 int error; 1088 1089 sdp = init_sbd(sb); 1090 if (!sdp) { 1091 pr_warn("can't alloc struct gfs2_sbd\n"); 1092 return -ENOMEM; 1093 } 1094 sdp->sd_args = *args; 1095 1096 if (sdp->sd_args.ar_spectator) { 1097 sb->s_flags |= SB_RDONLY; 1098 set_bit(SDF_RORECOVERY, &sdp->sd_flags); 1099 } 1100 if (sdp->sd_args.ar_posix_acl) 1101 sb->s_flags |= SB_POSIXACL; 1102 if (sdp->sd_args.ar_nobarrier) 1103 set_bit(SDF_NOBARRIERS, &sdp->sd_flags); 1104 1105 sb->s_flags |= SB_NOSEC; 1106 sb->s_magic = GFS2_MAGIC; 1107 sb->s_op = &gfs2_super_ops; 1108 sb->s_d_op = &gfs2_dops; 1109 sb->s_export_op = &gfs2_export_ops; 1110 sb->s_xattr = gfs2_xattr_handlers; 1111 sb->s_qcop = &gfs2_quotactl_ops; 1112 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; 1113 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE; 1114 sb->s_time_gran = 1; 1115 sb->s_maxbytes = MAX_LFS_FILESIZE; 1116 1117 /* Set up the buffer cache and fill in some fake block size values 1118 to allow us to read-in the on-disk superblock. */ 1119 sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK); 1120 sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits; 1121 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift - 1122 GFS2_BASIC_BLOCK_SHIFT; 1123 sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift); 1124 1125 sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit; 1126 sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum; 1127 if (sdp->sd_args.ar_statfs_quantum) { 1128 sdp->sd_tune.gt_statfs_slow = 0; 1129 sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum; 1130 } else { 1131 sdp->sd_tune.gt_statfs_slow = 1; 1132 sdp->sd_tune.gt_statfs_quantum = 30; 1133 } 1134 1135 error = init_names(sdp, silent); 1136 if (error) 1137 goto fail_free; 1138 1139 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s", sdp->sd_table_name); 1140 1141 error = gfs2_sys_fs_add(sdp); 1142 if (error) 1143 goto fail_free; 1144 1145 gfs2_create_debugfs_file(sdp); 1146 1147 error = gfs2_lm_mount(sdp, silent); 1148 if (error) 1149 goto fail_debug; 1150 1151 error = init_locking(sdp, &mount_gh, DO); 1152 if (error) 1153 goto fail_lm; 1154 1155 error = init_sb(sdp, silent); 1156 if (error) 1157 goto fail_locking; 1158 1159 error = wait_on_journal(sdp); 1160 if (error) 1161 goto fail_sb; 1162 1163 /* 1164 * If user space has failed to join the cluster or some similar 1165 * failure has occurred, then the journal id will contain a 1166 * negative (error) number. This will then be returned to the 1167 * caller (of the mount syscall). We do this even for spectator 1168 * mounts (which just write a jid of 0 to indicate "ok" even though 1169 * the jid is unused in the spectator case) 1170 */ 1171 if (sdp->sd_lockstruct.ls_jid < 0) { 1172 error = sdp->sd_lockstruct.ls_jid; 1173 sdp->sd_lockstruct.ls_jid = 0; 1174 goto fail_sb; 1175 } 1176 1177 if (sdp->sd_args.ar_spectator) 1178 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.s", 1179 sdp->sd_table_name); 1180 else 1181 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.%u", 1182 sdp->sd_table_name, sdp->sd_lockstruct.ls_jid); 1183 1184 error = init_inodes(sdp, DO); 1185 if (error) 1186 goto fail_sb; 1187 1188 error = init_per_node(sdp, DO); 1189 if (error) 1190 goto fail_inodes; 1191 1192 error = gfs2_statfs_init(sdp); 1193 if (error) { 1194 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error); 1195 goto fail_per_node; 1196 } 1197 1198 if (sb_rdonly(sb)) { 1199 struct gfs2_holder freeze_gh; 1200 1201 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, 1202 LM_FLAG_NOEXP | GL_EXACT, 1203 &freeze_gh); 1204 if (error) { 1205 fs_err(sdp, "can't make FS RO: %d\n", error); 1206 goto fail_per_node; 1207 } 1208 gfs2_glock_dq_uninit(&freeze_gh); 1209 } else { 1210 error = gfs2_make_fs_rw(sdp); 1211 if (error) { 1212 fs_err(sdp, "can't make FS RW: %d\n", error); 1213 goto fail_per_node; 1214 } 1215 } 1216 1217 gfs2_glock_dq_uninit(&mount_gh); 1218 gfs2_online_uevent(sdp); 1219 return 0; 1220 1221 fail_per_node: 1222 init_per_node(sdp, UNDO); 1223 fail_inodes: 1224 init_inodes(sdp, UNDO); 1225 fail_sb: 1226 if (sdp->sd_root_dir) 1227 dput(sdp->sd_root_dir); 1228 if (sdp->sd_master_dir) 1229 dput(sdp->sd_master_dir); 1230 if (sb->s_root) 1231 dput(sb->s_root); 1232 sb->s_root = NULL; 1233 fail_locking: 1234 init_locking(sdp, &mount_gh, UNDO); 1235 fail_lm: 1236 complete_all(&sdp->sd_journal_ready); 1237 gfs2_gl_hash_clear(sdp); 1238 gfs2_lm_unmount(sdp); 1239 fail_debug: 1240 gfs2_delete_debugfs_file(sdp); 1241 gfs2_sys_fs_del(sdp); 1242 fail_free: 1243 free_sbd(sdp); 1244 sb->s_fs_info = NULL; 1245 return error; 1246 } 1247 1248 /** 1249 * gfs2_get_tree - Get the GFS2 superblock and root directory 1250 * @fc: The filesystem context 1251 * 1252 * Returns: 0 or -errno on error 1253 */ 1254 static int gfs2_get_tree(struct fs_context *fc) 1255 { 1256 struct gfs2_args *args = fc->fs_private; 1257 struct gfs2_sbd *sdp; 1258 int error; 1259 1260 error = get_tree_bdev(fc, gfs2_fill_super); 1261 if (error) 1262 return error; 1263 1264 sdp = fc->root->d_sb->s_fs_info; 1265 dput(fc->root); 1266 if (args->ar_meta) 1267 fc->root = dget(sdp->sd_master_dir); 1268 else 1269 fc->root = dget(sdp->sd_root_dir); 1270 return 0; 1271 } 1272 1273 static void gfs2_fc_free(struct fs_context *fc) 1274 { 1275 struct gfs2_args *args = fc->fs_private; 1276 1277 kfree(args); 1278 } 1279 1280 enum gfs2_param { 1281 Opt_lockproto, 1282 Opt_locktable, 1283 Opt_hostdata, 1284 Opt_spectator, 1285 Opt_ignore_local_fs, 1286 Opt_localflocks, 1287 Opt_localcaching, 1288 Opt_debug, 1289 Opt_upgrade, 1290 Opt_acl, 1291 Opt_quota, 1292 Opt_quota_flag, 1293 Opt_suiddir, 1294 Opt_data, 1295 Opt_meta, 1296 Opt_discard, 1297 Opt_commit, 1298 Opt_errors, 1299 Opt_statfs_quantum, 1300 Opt_statfs_percent, 1301 Opt_quota_quantum, 1302 Opt_barrier, 1303 Opt_rgrplvb, 1304 Opt_loccookie, 1305 }; 1306 1307 static const struct constant_table gfs2_param_quota[] = { 1308 {"off", GFS2_QUOTA_OFF}, 1309 {"account", GFS2_QUOTA_ACCOUNT}, 1310 {"on", GFS2_QUOTA_ON}, 1311 {} 1312 }; 1313 1314 enum opt_data { 1315 Opt_data_writeback = GFS2_DATA_WRITEBACK, 1316 Opt_data_ordered = GFS2_DATA_ORDERED, 1317 }; 1318 1319 static const struct constant_table gfs2_param_data[] = { 1320 {"writeback", Opt_data_writeback }, 1321 {"ordered", Opt_data_ordered }, 1322 {} 1323 }; 1324 1325 enum opt_errors { 1326 Opt_errors_withdraw = GFS2_ERRORS_WITHDRAW, 1327 Opt_errors_panic = GFS2_ERRORS_PANIC, 1328 }; 1329 1330 static const struct constant_table gfs2_param_errors[] = { 1331 {"withdraw", Opt_errors_withdraw }, 1332 {"panic", Opt_errors_panic }, 1333 {} 1334 }; 1335 1336 static const struct fs_parameter_spec gfs2_fs_parameters[] = { 1337 fsparam_string ("lockproto", Opt_lockproto), 1338 fsparam_string ("locktable", Opt_locktable), 1339 fsparam_string ("hostdata", Opt_hostdata), 1340 fsparam_flag ("spectator", Opt_spectator), 1341 fsparam_flag ("norecovery", Opt_spectator), 1342 fsparam_flag ("ignore_local_fs", Opt_ignore_local_fs), 1343 fsparam_flag ("localflocks", Opt_localflocks), 1344 fsparam_flag ("localcaching", Opt_localcaching), 1345 fsparam_flag_no("debug", Opt_debug), 1346 fsparam_flag ("upgrade", Opt_upgrade), 1347 fsparam_flag_no("acl", Opt_acl), 1348 fsparam_flag_no("suiddir", Opt_suiddir), 1349 fsparam_enum ("data", Opt_data, gfs2_param_data), 1350 fsparam_flag ("meta", Opt_meta), 1351 fsparam_flag_no("discard", Opt_discard), 1352 fsparam_s32 ("commit", Opt_commit), 1353 fsparam_enum ("errors", Opt_errors, gfs2_param_errors), 1354 fsparam_s32 ("statfs_quantum", Opt_statfs_quantum), 1355 fsparam_s32 ("statfs_percent", Opt_statfs_percent), 1356 fsparam_s32 ("quota_quantum", Opt_quota_quantum), 1357 fsparam_flag_no("barrier", Opt_barrier), 1358 fsparam_flag_no("rgrplvb", Opt_rgrplvb), 1359 fsparam_flag_no("loccookie", Opt_loccookie), 1360 /* quota can be a flag or an enum so it gets special treatment */ 1361 fsparam_flag_no("quota", Opt_quota_flag), 1362 fsparam_enum("quota", Opt_quota, gfs2_param_quota), 1363 {} 1364 }; 1365 1366 /* Parse a single mount parameter */ 1367 static int gfs2_parse_param(struct fs_context *fc, struct fs_parameter *param) 1368 { 1369 struct gfs2_args *args = fc->fs_private; 1370 struct fs_parse_result result; 1371 int o; 1372 1373 o = fs_parse(fc, gfs2_fs_parameters, param, &result); 1374 if (o < 0) 1375 return o; 1376 1377 switch (o) { 1378 case Opt_lockproto: 1379 strlcpy(args->ar_lockproto, param->string, GFS2_LOCKNAME_LEN); 1380 break; 1381 case Opt_locktable: 1382 strlcpy(args->ar_locktable, param->string, GFS2_LOCKNAME_LEN); 1383 break; 1384 case Opt_hostdata: 1385 strlcpy(args->ar_hostdata, param->string, GFS2_LOCKNAME_LEN); 1386 break; 1387 case Opt_spectator: 1388 args->ar_spectator = 1; 1389 break; 1390 case Opt_ignore_local_fs: 1391 /* Retained for backwards compat only */ 1392 break; 1393 case Opt_localflocks: 1394 args->ar_localflocks = 1; 1395 break; 1396 case Opt_localcaching: 1397 /* Retained for backwards compat only */ 1398 break; 1399 case Opt_debug: 1400 if (result.boolean && args->ar_errors == GFS2_ERRORS_PANIC) 1401 return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive"); 1402 args->ar_debug = result.boolean; 1403 break; 1404 case Opt_upgrade: 1405 /* Retained for backwards compat only */ 1406 break; 1407 case Opt_acl: 1408 args->ar_posix_acl = result.boolean; 1409 break; 1410 case Opt_quota_flag: 1411 args->ar_quota = result.negated ? GFS2_QUOTA_OFF : GFS2_QUOTA_ON; 1412 break; 1413 case Opt_quota: 1414 args->ar_quota = result.int_32; 1415 break; 1416 case Opt_suiddir: 1417 args->ar_suiddir = result.boolean; 1418 break; 1419 case Opt_data: 1420 /* The uint_32 result maps directly to GFS2_DATA_* */ 1421 args->ar_data = result.uint_32; 1422 break; 1423 case Opt_meta: 1424 args->ar_meta = 1; 1425 break; 1426 case Opt_discard: 1427 args->ar_discard = result.boolean; 1428 break; 1429 case Opt_commit: 1430 if (result.int_32 <= 0) 1431 return invalfc(fc, "commit mount option requires a positive numeric argument"); 1432 args->ar_commit = result.int_32; 1433 break; 1434 case Opt_statfs_quantum: 1435 if (result.int_32 < 0) 1436 return invalfc(fc, "statfs_quantum mount option requires a non-negative numeric argument"); 1437 args->ar_statfs_quantum = result.int_32; 1438 break; 1439 case Opt_quota_quantum: 1440 if (result.int_32 <= 0) 1441 return invalfc(fc, "quota_quantum mount option requires a positive numeric argument"); 1442 args->ar_quota_quantum = result.int_32; 1443 break; 1444 case Opt_statfs_percent: 1445 if (result.int_32 < 0 || result.int_32 > 100) 1446 return invalfc(fc, "statfs_percent mount option requires a numeric argument between 0 and 100"); 1447 args->ar_statfs_percent = result.int_32; 1448 break; 1449 case Opt_errors: 1450 if (args->ar_debug && result.uint_32 == GFS2_ERRORS_PANIC) 1451 return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive"); 1452 args->ar_errors = result.uint_32; 1453 break; 1454 case Opt_barrier: 1455 args->ar_nobarrier = result.boolean; 1456 break; 1457 case Opt_rgrplvb: 1458 args->ar_rgrplvb = result.boolean; 1459 break; 1460 case Opt_loccookie: 1461 args->ar_loccookie = result.boolean; 1462 break; 1463 default: 1464 return invalfc(fc, "invalid mount option: %s", param->key); 1465 } 1466 return 0; 1467 } 1468 1469 static int gfs2_reconfigure(struct fs_context *fc) 1470 { 1471 struct super_block *sb = fc->root->d_sb; 1472 struct gfs2_sbd *sdp = sb->s_fs_info; 1473 struct gfs2_args *oldargs = &sdp->sd_args; 1474 struct gfs2_args *newargs = fc->fs_private; 1475 struct gfs2_tune *gt = &sdp->sd_tune; 1476 int error = 0; 1477 1478 sync_filesystem(sb); 1479 1480 spin_lock(>->gt_spin); 1481 oldargs->ar_commit = gt->gt_logd_secs; 1482 oldargs->ar_quota_quantum = gt->gt_quota_quantum; 1483 if (gt->gt_statfs_slow) 1484 oldargs->ar_statfs_quantum = 0; 1485 else 1486 oldargs->ar_statfs_quantum = gt->gt_statfs_quantum; 1487 spin_unlock(>->gt_spin); 1488 1489 if (strcmp(newargs->ar_lockproto, oldargs->ar_lockproto)) { 1490 errorfc(fc, "reconfiguration of locking protocol not allowed"); 1491 return -EINVAL; 1492 } 1493 if (strcmp(newargs->ar_locktable, oldargs->ar_locktable)) { 1494 errorfc(fc, "reconfiguration of lock table not allowed"); 1495 return -EINVAL; 1496 } 1497 if (strcmp(newargs->ar_hostdata, oldargs->ar_hostdata)) { 1498 errorfc(fc, "reconfiguration of host data not allowed"); 1499 return -EINVAL; 1500 } 1501 if (newargs->ar_spectator != oldargs->ar_spectator) { 1502 errorfc(fc, "reconfiguration of spectator mode not allowed"); 1503 return -EINVAL; 1504 } 1505 if (newargs->ar_localflocks != oldargs->ar_localflocks) { 1506 errorfc(fc, "reconfiguration of localflocks not allowed"); 1507 return -EINVAL; 1508 } 1509 if (newargs->ar_meta != oldargs->ar_meta) { 1510 errorfc(fc, "switching between gfs2 and gfs2meta not allowed"); 1511 return -EINVAL; 1512 } 1513 if (oldargs->ar_spectator) 1514 fc->sb_flags |= SB_RDONLY; 1515 1516 if ((sb->s_flags ^ fc->sb_flags) & SB_RDONLY) { 1517 if (fc->sb_flags & SB_RDONLY) { 1518 error = gfs2_make_fs_ro(sdp); 1519 if (error) 1520 errorfc(fc, "unable to remount read-only"); 1521 } else { 1522 error = gfs2_make_fs_rw(sdp); 1523 if (error) 1524 errorfc(fc, "unable to remount read-write"); 1525 } 1526 } 1527 sdp->sd_args = *newargs; 1528 1529 if (sdp->sd_args.ar_posix_acl) 1530 sb->s_flags |= SB_POSIXACL; 1531 else 1532 sb->s_flags &= ~SB_POSIXACL; 1533 if (sdp->sd_args.ar_nobarrier) 1534 set_bit(SDF_NOBARRIERS, &sdp->sd_flags); 1535 else 1536 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags); 1537 spin_lock(>->gt_spin); 1538 gt->gt_logd_secs = newargs->ar_commit; 1539 gt->gt_quota_quantum = newargs->ar_quota_quantum; 1540 if (newargs->ar_statfs_quantum) { 1541 gt->gt_statfs_slow = 0; 1542 gt->gt_statfs_quantum = newargs->ar_statfs_quantum; 1543 } 1544 else { 1545 gt->gt_statfs_slow = 1; 1546 gt->gt_statfs_quantum = 30; 1547 } 1548 spin_unlock(>->gt_spin); 1549 1550 gfs2_online_uevent(sdp); 1551 return error; 1552 } 1553 1554 static const struct fs_context_operations gfs2_context_ops = { 1555 .free = gfs2_fc_free, 1556 .parse_param = gfs2_parse_param, 1557 .get_tree = gfs2_get_tree, 1558 .reconfigure = gfs2_reconfigure, 1559 }; 1560 1561 /* Set up the filesystem mount context */ 1562 static int gfs2_init_fs_context(struct fs_context *fc) 1563 { 1564 struct gfs2_args *args; 1565 1566 args = kmalloc(sizeof(*args), GFP_KERNEL); 1567 if (args == NULL) 1568 return -ENOMEM; 1569 1570 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) { 1571 struct gfs2_sbd *sdp = fc->root->d_sb->s_fs_info; 1572 1573 *args = sdp->sd_args; 1574 } else { 1575 memset(args, 0, sizeof(*args)); 1576 args->ar_quota = GFS2_QUOTA_DEFAULT; 1577 args->ar_data = GFS2_DATA_DEFAULT; 1578 args->ar_commit = 30; 1579 args->ar_statfs_quantum = 30; 1580 args->ar_quota_quantum = 60; 1581 args->ar_errors = GFS2_ERRORS_DEFAULT; 1582 } 1583 fc->fs_private = args; 1584 fc->ops = &gfs2_context_ops; 1585 return 0; 1586 } 1587 1588 static int set_meta_super(struct super_block *s, struct fs_context *fc) 1589 { 1590 return -EINVAL; 1591 } 1592 1593 static int test_meta_super(struct super_block *s, struct fs_context *fc) 1594 { 1595 return (fc->sget_key == s->s_bdev); 1596 } 1597 1598 static int gfs2_meta_get_tree(struct fs_context *fc) 1599 { 1600 struct super_block *s; 1601 struct gfs2_sbd *sdp; 1602 struct path path; 1603 int error; 1604 1605 if (!fc->source || !*fc->source) 1606 return -EINVAL; 1607 1608 error = kern_path(fc->source, LOOKUP_FOLLOW, &path); 1609 if (error) { 1610 pr_warn("path_lookup on %s returned error %d\n", 1611 fc->source, error); 1612 return error; 1613 } 1614 fc->fs_type = &gfs2_fs_type; 1615 fc->sget_key = path.dentry->d_sb->s_bdev; 1616 s = sget_fc(fc, test_meta_super, set_meta_super); 1617 path_put(&path); 1618 if (IS_ERR(s)) { 1619 pr_warn("gfs2 mount does not exist\n"); 1620 return PTR_ERR(s); 1621 } 1622 if ((fc->sb_flags ^ s->s_flags) & SB_RDONLY) { 1623 deactivate_locked_super(s); 1624 return -EBUSY; 1625 } 1626 sdp = s->s_fs_info; 1627 fc->root = dget(sdp->sd_master_dir); 1628 return 0; 1629 } 1630 1631 static const struct fs_context_operations gfs2_meta_context_ops = { 1632 .free = gfs2_fc_free, 1633 .get_tree = gfs2_meta_get_tree, 1634 }; 1635 1636 static int gfs2_meta_init_fs_context(struct fs_context *fc) 1637 { 1638 int ret = gfs2_init_fs_context(fc); 1639 1640 if (ret) 1641 return ret; 1642 1643 fc->ops = &gfs2_meta_context_ops; 1644 return 0; 1645 } 1646 1647 static void gfs2_kill_sb(struct super_block *sb) 1648 { 1649 struct gfs2_sbd *sdp = sb->s_fs_info; 1650 1651 if (sdp == NULL) { 1652 kill_block_super(sb); 1653 return; 1654 } 1655 1656 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SYNC | GFS2_LFC_KILL_SB); 1657 dput(sdp->sd_root_dir); 1658 dput(sdp->sd_master_dir); 1659 sdp->sd_root_dir = NULL; 1660 sdp->sd_master_dir = NULL; 1661 shrink_dcache_sb(sb); 1662 kill_block_super(sb); 1663 } 1664 1665 struct file_system_type gfs2_fs_type = { 1666 .name = "gfs2", 1667 .fs_flags = FS_REQUIRES_DEV, 1668 .init_fs_context = gfs2_init_fs_context, 1669 .parameters = gfs2_fs_parameters, 1670 .kill_sb = gfs2_kill_sb, 1671 .owner = THIS_MODULE, 1672 }; 1673 MODULE_ALIAS_FS("gfs2"); 1674 1675 struct file_system_type gfs2meta_fs_type = { 1676 .name = "gfs2meta", 1677 .fs_flags = FS_REQUIRES_DEV, 1678 .init_fs_context = gfs2_meta_init_fs_context, 1679 .owner = THIS_MODULE, 1680 }; 1681 MODULE_ALIAS_FS("gfs2meta"); 1682