| /* |
| * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. |
| * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved. |
| * |
| * This copyrighted material is made available to anyone wishing to use, |
| * modify, copy, or redistribute it subject to the terms and conditions |
| * of the GNU General Public License version 2. |
| */ |
| |
| #include <linux/sched.h> |
| #include <linux/slab.h> |
| #include <linux/spinlock.h> |
| #include <linux/completion.h> |
| #include <linux/buffer_head.h> |
| #include <linux/blkdev.h> |
| #include <linux/kthread.h> |
| #include <linux/namei.h> |
| #include <linux/mount.h> |
| #include <linux/gfs2_ondisk.h> |
| |
| #include "gfs2.h" |
| #include "incore.h" |
| #include "bmap.h" |
| #include "glock.h" |
| #include "glops.h" |
| #include "inode.h" |
| #include "recovery.h" |
| #include "rgrp.h" |
| #include "super.h" |
| #include "sys.h" |
| #include "util.h" |
| #include "log.h" |
| #include "quota.h" |
| #include "dir.h" |
| |
| #define DO 0 |
| #define UNDO 1 |
| |
| static const u32 gfs2_old_fs_formats[] = { |
| 0 |
| }; |
| |
| static const u32 gfs2_old_multihost_formats[] = { |
| 0 |
| }; |
| |
| /** |
| * gfs2_tune_init - Fill a gfs2_tune structure with default values |
| * @gt: tune |
| * |
| */ |
| |
| static void gfs2_tune_init(struct gfs2_tune *gt) |
| { |
| spin_lock_init(>->gt_spin); |
| |
| gt->gt_incore_log_blocks = 1024; |
| gt->gt_log_flush_secs = 60; |
| gt->gt_recoverd_secs = 60; |
| gt->gt_logd_secs = 1; |
| gt->gt_quota_simul_sync = 64; |
| gt->gt_quota_warn_period = 10; |
| gt->gt_quota_scale_num = 1; |
| gt->gt_quota_scale_den = 1; |
| gt->gt_quota_quantum = 60; |
| gt->gt_new_files_jdata = 0; |
| gt->gt_max_readahead = 1 << 18; |
| gt->gt_stall_secs = 600; |
| gt->gt_complain_secs = 10; |
| gt->gt_statfs_quantum = 30; |
| gt->gt_statfs_slow = 0; |
| } |
| |
| static struct gfs2_sbd *init_sbd(struct super_block *sb) |
| { |
| struct gfs2_sbd *sdp; |
| |
| sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL); |
| if (!sdp) |
| return NULL; |
| |
| sb->s_fs_info = sdp; |
| sdp->sd_vfs = sb; |
| |
| gfs2_tune_init(&sdp->sd_tune); |
| |
| mutex_init(&sdp->sd_inum_mutex); |
| spin_lock_init(&sdp->sd_statfs_spin); |
| |
| spin_lock_init(&sdp->sd_rindex_spin); |
| mutex_init(&sdp->sd_rindex_mutex); |
| INIT_LIST_HEAD(&sdp->sd_rindex_list); |
| INIT_LIST_HEAD(&sdp->sd_rindex_mru_list); |
| |
| INIT_LIST_HEAD(&sdp->sd_jindex_list); |
| spin_lock_init(&sdp->sd_jindex_spin); |
| mutex_init(&sdp->sd_jindex_mutex); |
| |
| INIT_LIST_HEAD(&sdp->sd_quota_list); |
| mutex_init(&sdp->sd_quota_mutex); |
| init_waitqueue_head(&sdp->sd_quota_wait); |
| INIT_LIST_HEAD(&sdp->sd_trunc_list); |
| spin_lock_init(&sdp->sd_trunc_lock); |
| |
| spin_lock_init(&sdp->sd_log_lock); |
| |
| INIT_LIST_HEAD(&sdp->sd_log_le_buf); |
| INIT_LIST_HEAD(&sdp->sd_log_le_revoke); |
| INIT_LIST_HEAD(&sdp->sd_log_le_rg); |
| INIT_LIST_HEAD(&sdp->sd_log_le_databuf); |
| INIT_LIST_HEAD(&sdp->sd_log_le_ordered); |
| |
| mutex_init(&sdp->sd_log_reserve_mutex); |
| INIT_LIST_HEAD(&sdp->sd_ail1_list); |
| INIT_LIST_HEAD(&sdp->sd_ail2_list); |
| |
| init_rwsem(&sdp->sd_log_flush_lock); |
| atomic_set(&sdp->sd_log_in_flight, 0); |
| init_waitqueue_head(&sdp->sd_log_flush_wait); |
| |
| INIT_LIST_HEAD(&sdp->sd_revoke_list); |
| |
| mutex_init(&sdp->sd_freeze_lock); |
| |
| return sdp; |
| } |
| |
| |
| /** |
| * gfs2_check_sb - Check superblock |
| * @sdp: the filesystem |
| * @sb: The superblock |
| * @silent: Don't print a message if the check fails |
| * |
| * Checks the version code of the FS is one that we understand how to |
| * read and that the sizes of the various on-disk structures have not |
| * changed. |
| */ |
| |
| static int gfs2_check_sb(struct gfs2_sbd *sdp, struct gfs2_sb_host *sb, int silent) |
| { |
| unsigned int x; |
| |
| if (sb->sb_magic != GFS2_MAGIC || |
| sb->sb_type != GFS2_METATYPE_SB) { |
| if (!silent) |
| printk(KERN_WARNING "GFS2: not a GFS2 filesystem\n"); |
| return -EINVAL; |
| } |
| |
| /* If format numbers match exactly, we're done. */ |
| |
| if (sb->sb_fs_format == GFS2_FORMAT_FS && |
| sb->sb_multihost_format == GFS2_FORMAT_MULTI) |
| return 0; |
| |
| if (sb->sb_fs_format != GFS2_FORMAT_FS) { |
| for (x = 0; gfs2_old_fs_formats[x]; x++) |
| if (gfs2_old_fs_formats[x] == sb->sb_fs_format) |
| break; |
| |
| if (!gfs2_old_fs_formats[x]) { |
| printk(KERN_WARNING |
| "GFS2: code version (%u, %u) is incompatible " |
| "with ondisk format (%u, %u)\n", |
| GFS2_FORMAT_FS, GFS2_FORMAT_MULTI, |
| sb->sb_fs_format, sb->sb_multihost_format); |
| printk(KERN_WARNING |
| "GFS2: I don't know how to upgrade this FS\n"); |
| return -EINVAL; |
| } |
| } |
| |
| if (sb->sb_multihost_format != GFS2_FORMAT_MULTI) { |
| for (x = 0; gfs2_old_multihost_formats[x]; x++) |
| if (gfs2_old_multihost_formats[x] == |
| sb->sb_multihost_format) |
| break; |
| |
| if (!gfs2_old_multihost_formats[x]) { |
| printk(KERN_WARNING |
| "GFS2: code version (%u, %u) is incompatible " |
| "with ondisk format (%u, %u)\n", |
| GFS2_FORMAT_FS, GFS2_FORMAT_MULTI, |
| sb->sb_fs_format, sb->sb_multihost_format); |
| printk(KERN_WARNING |
| "GFS2: I don't know how to upgrade this FS\n"); |
| return -EINVAL; |
| } |
| } |
| |
| if (!sdp->sd_args.ar_upgrade) { |
| printk(KERN_WARNING |
| "GFS2: code version (%u, %u) is incompatible " |
| "with ondisk format (%u, %u)\n", |
| GFS2_FORMAT_FS, GFS2_FORMAT_MULTI, |
| sb->sb_fs_format, sb->sb_multihost_format); |
| printk(KERN_INFO |
| "GFS2: Use the \"upgrade\" mount option to upgrade " |
| "the FS\n"); |
| printk(KERN_INFO "GFS2: See the manual for more details\n"); |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| static void end_bio_io_page(struct bio *bio, int error) |
| { |
| struct page *page = bio->bi_private; |
| |
| if (!error) |
| SetPageUptodate(page); |
| else |
| printk(KERN_WARNING "gfs2: error %d reading superblock\n", error); |
| unlock_page(page); |
| } |
| |
| static void gfs2_sb_in(struct gfs2_sb_host *sb, const void *buf) |
| { |
| const struct gfs2_sb *str = buf; |
| |
| sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic); |
| sb->sb_type = be32_to_cpu(str->sb_header.mh_type); |
| sb->sb_format = be32_to_cpu(str->sb_header.mh_format); |
| sb->sb_fs_format = be32_to_cpu(str->sb_fs_format); |
| sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format); |
| sb->sb_bsize = be32_to_cpu(str->sb_bsize); |
| sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift); |
| sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr); |
| sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino); |
| sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr); |
| sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino); |
| |
| memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN); |
| memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN); |
| memcpy(sb->sb_uuid, str->sb_uuid, 16); |
| } |
| |
| /** |
| * gfs2_read_super - Read the gfs2 super block from disk |
| * @sdp: The GFS2 super block |
| * @sector: The location of the super block |
| * @error: The error code to return |
| * |
| * This uses the bio functions to read the super block from disk |
| * because we want to be 100% sure that we never read cached data. |
| * A super block is read twice only during each GFS2 mount and is |
| * never written to by the filesystem. The first time its read no |
| * locks are held, and the only details which are looked at are those |
| * relating to the locking protocol. Once locking is up and working, |
| * the sb is read again under the lock to establish the location of |
| * the master directory (contains pointers to journals etc) and the |
| * root directory. |
| * |
| * Returns: 0 on success or error |
| */ |
| |
| static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector) |
| { |
| struct super_block *sb = sdp->sd_vfs; |
| struct gfs2_sb *p; |
| struct page *page; |
| struct bio *bio; |
| |
| page = alloc_page(GFP_NOFS); |
| if (unlikely(!page)) |
| return -ENOBUFS; |
| |
| ClearPageUptodate(page); |
| ClearPageDirty(page); |
| lock_page(page); |
| |
| bio = bio_alloc(GFP_NOFS, 1); |
| bio->bi_sector = sector * (sb->s_blocksize >> 9); |
| bio->bi_bdev = sb->s_bdev; |
| bio_add_page(bio, page, PAGE_SIZE, 0); |
| |
| bio->bi_end_io = end_bio_io_page; |
| bio->bi_private = page; |
| submit_bio(READ_SYNC | (1 << BIO_RW_META), bio); |
| wait_on_page_locked(page); |
| bio_put(bio); |
| if (!PageUptodate(page)) { |
| __free_page(page); |
| return -EIO; |
| } |
| p = kmap(page); |
| gfs2_sb_in(&sdp->sd_sb, p); |
| kunmap(page); |
| __free_page(page); |
| return 0; |
| } |
| |
| /** |
| * gfs2_read_sb - Read super block |
| * @sdp: The GFS2 superblock |
| * @silent: Don't print message if mount fails |
| * |
| */ |
| |
| static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent) |
| { |
| u32 hash_blocks, ind_blocks, leaf_blocks; |
| u32 tmp_blocks; |
| unsigned int x; |
| int error; |
| |
| error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift); |
| if (error) { |
| if (!silent) |
| fs_err(sdp, "can't read superblock\n"); |
| return error; |
| } |
| |
| error = gfs2_check_sb(sdp, &sdp->sd_sb, silent); |
| if (error) |
| return error; |
| |
| sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift - |
| GFS2_BASIC_BLOCK_SHIFT; |
| sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift; |
| sdp->sd_diptrs = (sdp->sd_sb.sb_bsize - |
| sizeof(struct gfs2_dinode)) / sizeof(u64); |
| sdp->sd_inptrs = (sdp->sd_sb.sb_bsize - |
| sizeof(struct gfs2_meta_header)) / sizeof(u64); |
| sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header); |
| sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2; |
| sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1; |
| sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64); |
| sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize - |
| sizeof(struct gfs2_meta_header)) / |
| sizeof(struct gfs2_quota_change); |
| |
| /* Compute maximum reservation required to add a entry to a directory */ |
| |
| hash_blocks = DIV_ROUND_UP(sizeof(u64) * (1 << GFS2_DIR_MAX_DEPTH), |
| sdp->sd_jbsize); |
| |
| ind_blocks = 0; |
| for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) { |
| tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs); |
| ind_blocks += tmp_blocks; |
| } |
| |
| leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH; |
| |
| sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks; |
| |
| sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize - |
| sizeof(struct gfs2_dinode); |
| sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs; |
| for (x = 2;; x++) { |
| u64 space, d; |
| u32 m; |
| |
| space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs; |
| d = space; |
| m = do_div(d, sdp->sd_inptrs); |
| |
| if (d != sdp->sd_heightsize[x - 1] || m) |
| break; |
| sdp->sd_heightsize[x] = space; |
| } |
| sdp->sd_max_height = x; |
| sdp->sd_heightsize[x] = ~0; |
| gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT); |
| |
| sdp->sd_jheightsize[0] = sdp->sd_sb.sb_bsize - |
| sizeof(struct gfs2_dinode); |
| sdp->sd_jheightsize[1] = sdp->sd_jbsize * sdp->sd_diptrs; |
| for (x = 2;; x++) { |
| u64 space, d; |
| u32 m; |
| |
| space = sdp->sd_jheightsize[x - 1] * sdp->sd_inptrs; |
| d = space; |
| m = do_div(d, sdp->sd_inptrs); |
| |
| if (d != sdp->sd_jheightsize[x - 1] || m) |
| break; |
| sdp->sd_jheightsize[x] = space; |
| } |
| sdp->sd_max_jheight = x; |
| sdp->sd_jheightsize[x] = ~0; |
| gfs2_assert(sdp, sdp->sd_max_jheight <= GFS2_MAX_META_HEIGHT); |
| |
| return 0; |
| } |
| |
| static int init_names(struct gfs2_sbd *sdp, int silent) |
| { |
| char *proto, *table; |
| int error = 0; |
| |
| proto = sdp->sd_args.ar_lockproto; |
| table = sdp->sd_args.ar_locktable; |
| |
| /* Try to autodetect */ |
| |
| if (!proto[0] || !table[0]) { |
| error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift); |
| if (error) |
| return error; |
| |
| error = gfs2_check_sb(sdp, &sdp->sd_sb, silent); |
| if (error) |
| goto out; |
| |
| if (!proto[0]) |
| proto = sdp->sd_sb.sb_lockproto; |
| if (!table[0]) |
| table = sdp->sd_sb.sb_locktable; |
| } |
| |
| if (!table[0]) |
| table = sdp->sd_vfs->s_id; |
| |
| strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN); |
| strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN); |
| |
| table = sdp->sd_table_name; |
| while ((table = strchr(table, '/'))) |
| *table = '_'; |
| |
| out: |
| return error; |
| } |
| |
| static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh, |
| int undo) |
| { |
| int error = 0; |
| |
| if (undo) |
| goto fail_trans; |
| |
| error = gfs2_glock_nq_num(sdp, |
| GFS2_MOUNT_LOCK, &gfs2_nondisk_glops, |
| LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE, |
| mount_gh); |
| if (error) { |
| fs_err(sdp, "can't acquire mount glock: %d\n", error); |
| goto fail; |
| } |
| |
| error = gfs2_glock_nq_num(sdp, |
| GFS2_LIVE_LOCK, &gfs2_nondisk_glops, |
| LM_ST_SHARED, |
| LM_FLAG_NOEXP | GL_EXACT, |
| &sdp->sd_live_gh); |
| if (error) { |
| fs_err(sdp, "can't acquire live glock: %d\n", error); |
| goto fail_mount; |
| } |
| |
| error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops, |
| CREATE, &sdp->sd_rename_gl); |
| if (error) { |
| fs_err(sdp, "can't create rename glock: %d\n", error); |
| goto fail_live; |
| } |
| |
| error = gfs2_glock_get(sdp, GFS2_TRANS_LOCK, &gfs2_trans_glops, |
| CREATE, &sdp->sd_trans_gl); |
| if (error) { |
| fs_err(sdp, "can't create transaction glock: %d\n", error); |
| goto fail_rename; |
| } |
| |
| return 0; |
| |
| fail_trans: |
| gfs2_glock_put(sdp->sd_trans_gl); |
| fail_rename: |
| gfs2_glock_put(sdp->sd_rename_gl); |
| fail_live: |
| gfs2_glock_dq_uninit(&sdp->sd_live_gh); |
| fail_mount: |
| gfs2_glock_dq_uninit(mount_gh); |
| fail: |
| return error; |
| } |
| |
| static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr, |
| u64 no_addr, const char *name) |
| { |
| struct gfs2_sbd *sdp = sb->s_fs_info; |
| struct dentry *dentry; |
| struct inode *inode; |
| |
| inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0, 0); |
| if (IS_ERR(inode)) { |
| fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode)); |
| return PTR_ERR(inode); |
| } |
| dentry = d_alloc_root(inode); |
| if (!dentry) { |
| fs_err(sdp, "can't alloc %s dentry\n", name); |
| iput(inode); |
| return -ENOMEM; |
| } |
| dentry->d_op = &gfs2_dops; |
| *dptr = dentry; |
| return 0; |
| } |
| |
| static int init_sb(struct gfs2_sbd *sdp, int silent) |
| { |
| struct super_block *sb = sdp->sd_vfs; |
| struct gfs2_holder sb_gh; |
| u64 no_addr; |
| int ret; |
| |
| ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops, |
| LM_ST_SHARED, 0, &sb_gh); |
| if (ret) { |
| fs_err(sdp, "can't acquire superblock glock: %d\n", ret); |
| return ret; |
| } |
| |
| ret = gfs2_read_sb(sdp, silent); |
| if (ret) { |
| fs_err(sdp, "can't read superblock: %d\n", ret); |
| goto out; |
| } |
| |
| /* Set up the buffer cache and SB for real */ |
| if (sdp->sd_sb.sb_bsize < bdev_hardsect_size(sb->s_bdev)) { |
| ret = -EINVAL; |
| fs_err(sdp, "FS block size (%u) is too small for device " |
| "block size (%u)\n", |
| sdp->sd_sb.sb_bsize, bdev_hardsect_size(sb->s_bdev)); |
| goto out; |
| } |
| if (sdp->sd_sb.sb_bsize > PAGE_SIZE) { |
| ret = -EINVAL; |
| fs_err(sdp, "FS block size (%u) is too big for machine " |
| "page size (%u)\n", |
| sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE); |
| goto out; |
| } |
| sb_set_blocksize(sb, sdp->sd_sb.sb_bsize); |
| |
| /* Get the root inode */ |
| no_addr = sdp->sd_sb.sb_root_dir.no_addr; |
| ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root"); |
| if (ret) |
| goto out; |
| |
| /* Get the master inode */ |
| no_addr = sdp->sd_sb.sb_master_dir.no_addr; |
| ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master"); |
| if (ret) { |
| dput(sdp->sd_root_dir); |
| goto out; |
| } |
| sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir); |
| out: |
| gfs2_glock_dq_uninit(&sb_gh); |
| return ret; |
| } |
| |
| /** |
| * map_journal_extents - create a reusable "extent" mapping from all logical |
| * blocks to all physical blocks for the given journal. This will save |
| * us time when writing journal blocks. Most journals will have only one |
| * extent that maps all their logical blocks. That's because gfs2.mkfs |
| * arranges the journal blocks sequentially to maximize performance. |
| * So the extent would map the first block for the entire file length. |
| * However, gfs2_jadd can happen while file activity is happening, so |
| * those journals may not be sequential. Less likely is the case where |
| * the users created their own journals by mounting the metafs and |
| * laying it out. But it's still possible. These journals might have |
| * several extents. |
| * |
| * TODO: This should be done in bigger chunks rather than one block at a time, |
| * but since it's only done at mount time, I'm not worried about the |
| * time it takes. |
| */ |
| static int map_journal_extents(struct gfs2_sbd *sdp) |
| { |
| struct gfs2_jdesc *jd = sdp->sd_jdesc; |
| unsigned int lb; |
| u64 db, prev_db; /* logical block, disk block, prev disk block */ |
| struct gfs2_inode *ip = GFS2_I(jd->jd_inode); |
| struct gfs2_journal_extent *jext = NULL; |
| struct buffer_head bh; |
| int rc = 0; |
| |
| prev_db = 0; |
| |
| for (lb = 0; lb < ip->i_disksize >> sdp->sd_sb.sb_bsize_shift; lb++) { |
| bh.b_state = 0; |
| bh.b_blocknr = 0; |
| bh.b_size = 1 << ip->i_inode.i_blkbits; |
| rc = gfs2_block_map(jd->jd_inode, lb, &bh, 0); |
| db = bh.b_blocknr; |
| if (rc || !db) { |
| printk(KERN_INFO "GFS2 journal mapping error %d: lb=" |
| "%u db=%llu\n", rc, lb, (unsigned long long)db); |
| break; |
| } |
| if (!prev_db || db != prev_db + 1) { |
| jext = kzalloc(sizeof(struct gfs2_journal_extent), |
| GFP_KERNEL); |
| if (!jext) { |
| printk(KERN_INFO "GFS2 error: out of memory " |
| "mapping journal extents.\n"); |
| rc = -ENOMEM; |
| break; |
| } |
| jext->dblock = db; |
| jext->lblock = lb; |
| jext->blocks = 1; |
| list_add_tail(&jext->extent_list, &jd->extent_list); |
| } else { |
| jext->blocks++; |
| } |
| prev_db = db; |
| } |
| return rc; |
| } |
| |
| static void gfs2_others_may_mount(struct gfs2_sbd *sdp) |
| { |
| char *message = "FIRSTMOUNT=Done"; |
| char *envp[] = { message, NULL }; |
| struct lm_lockstruct *ls = &sdp->sd_lockstruct; |
| ls->ls_first_done = 1; |
| kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp); |
| } |
| |
| /** |
| * gfs2_jindex_hold - Grab a lock on the jindex |
| * @sdp: The GFS2 superblock |
| * @ji_gh: the holder for the jindex glock |
| * |
| * Returns: errno |
| */ |
| |
| static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh) |
| { |
| struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex); |
| struct qstr name; |
| char buf[20]; |
| struct gfs2_jdesc *jd; |
| int error; |
| |
| name.name = buf; |
| |
| mutex_lock(&sdp->sd_jindex_mutex); |
| |
| for (;;) { |
| error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh); |
| if (error) |
| break; |
| |
| name.len = sprintf(buf, "journal%u", sdp->sd_journals); |
| name.hash = gfs2_disk_hash(name.name, name.len); |
| |
| error = gfs2_dir_check(sdp->sd_jindex, &name, NULL); |
| if (error == -ENOENT) { |
| error = 0; |
| break; |
| } |
| |
| gfs2_glock_dq_uninit(ji_gh); |
| |
| if (error) |
| break; |
| |
| error = -ENOMEM; |
| jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL); |
| if (!jd) |
| break; |
| |
| INIT_LIST_HEAD(&jd->extent_list); |
| jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1); |
| if (!jd->jd_inode || IS_ERR(jd->jd_inode)) { |
| if (!jd->jd_inode) |
| error = -ENOENT; |
| else |
| error = PTR_ERR(jd->jd_inode); |
| kfree(jd); |
| break; |
| } |
| |
| spin_lock(&sdp->sd_jindex_spin); |
| jd->jd_jid = sdp->sd_journals++; |
| list_add_tail(&jd->jd_list, &sdp->sd_jindex_list); |
| spin_unlock(&sdp->sd_jindex_spin); |
| } |
| |
| mutex_unlock(&sdp->sd_jindex_mutex); |
| |
| return error; |
| } |
| |
| static int init_journal(struct gfs2_sbd *sdp, int undo) |
| { |
| struct inode *master = sdp->sd_master_dir->d_inode; |
| struct gfs2_holder ji_gh; |
| struct task_struct *p; |
| struct gfs2_inode *ip; |
| int jindex = 1; |
| int error = 0; |
| |
| if (undo) { |
| jindex = 0; |
| goto fail_recoverd; |
| } |
| |
| sdp->sd_jindex = gfs2_lookup_simple(master, "jindex"); |
| if (IS_ERR(sdp->sd_jindex)) { |
| fs_err(sdp, "can't lookup journal index: %d\n", error); |
| return PTR_ERR(sdp->sd_jindex); |
| } |
| ip = GFS2_I(sdp->sd_jindex); |
| |
| /* Load in the journal index special file */ |
| |
| error = gfs2_jindex_hold(sdp, &ji_gh); |
| if (error) { |
| fs_err(sdp, "can't read journal index: %d\n", error); |
| goto fail; |
| } |
| |
| error = -EINVAL; |
| if (!gfs2_jindex_size(sdp)) { |
| fs_err(sdp, "no journals!\n"); |
| goto fail_jindex; |
| } |
| |
| if (sdp->sd_args.ar_spectator) { |
| sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0); |
| atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks); |
| } else { |
| if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) { |
| fs_err(sdp, "can't mount journal #%u\n", |
| sdp->sd_lockstruct.ls_jid); |
| fs_err(sdp, "there are only %u journals (0 - %u)\n", |
| gfs2_jindex_size(sdp), |
| gfs2_jindex_size(sdp) - 1); |
| goto fail_jindex; |
| } |
| sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid); |
| |
| error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid, |
| &gfs2_journal_glops, |
| LM_ST_EXCLUSIVE, LM_FLAG_NOEXP, |
| &sdp->sd_journal_gh); |
| if (error) { |
| fs_err(sdp, "can't acquire journal glock: %d\n", error); |
| goto fail_jindex; |
| } |
| |
| ip = GFS2_I(sdp->sd_jdesc->jd_inode); |
| error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, |
| LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE, |
| &sdp->sd_jinode_gh); |
| if (error) { |
| fs_err(sdp, "can't acquire journal inode glock: %d\n", |
| error); |
| goto fail_journal_gh; |
| } |
| |
| error = gfs2_jdesc_check(sdp->sd_jdesc); |
| if (error) { |
| fs_err(sdp, "my journal (%u) is bad: %d\n", |
| sdp->sd_jdesc->jd_jid, error); |
| goto fail_jinode_gh; |
| } |
| atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks); |
| |
| /* Map the extents for this journal's blocks */ |
| map_journal_extents(sdp); |
| } |
| |
| if (sdp->sd_lockstruct.ls_first) { |
| unsigned int x; |
| for (x = 0; x < sdp->sd_journals; x++) { |
| error = gfs2_recover_journal(gfs2_jdesc_find(sdp, x)); |
| if (error) { |
| fs_err(sdp, "error recovering journal %u: %d\n", |
| x, error); |
| goto fail_jinode_gh; |
| } |
| } |
| |
| gfs2_others_may_mount(sdp); |
| } else if (!sdp->sd_args.ar_spectator) { |
| error = gfs2_recover_journal(sdp->sd_jdesc); |
| if (error) { |
| fs_err(sdp, "error recovering my journal: %d\n", error); |
| goto fail_jinode_gh; |
| } |
| } |
| |
| set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags); |
| gfs2_glock_dq_uninit(&ji_gh); |
| jindex = 0; |
| |
| p = kthread_run(gfs2_recoverd, sdp, "gfs2_recoverd"); |
| error = IS_ERR(p); |
| if (error) { |
| fs_err(sdp, "can't start recoverd thread: %d\n", error); |
| goto fail_jinode_gh; |
| } |
| sdp->sd_recoverd_process = p; |
| |
| return 0; |
| |
| fail_recoverd: |
| kthread_stop(sdp->sd_recoverd_process); |
| fail_jinode_gh: |
| if (!sdp->sd_args.ar_spectator) |
| gfs2_glock_dq_uninit(&sdp->sd_jinode_gh); |
| fail_journal_gh: |
| if (!sdp->sd_args.ar_spectator) |
| gfs2_glock_dq_uninit(&sdp->sd_journal_gh); |
| fail_jindex: |
| gfs2_jindex_free(sdp); |
| if (jindex) |
| gfs2_glock_dq_uninit(&ji_gh); |
| fail: |
| iput(sdp->sd_jindex); |
| return error; |
| } |
| |
| |
| static int init_inodes(struct gfs2_sbd *sdp, int undo) |
| { |
| int error = 0; |
| struct gfs2_inode *ip; |
| struct inode *master = sdp->sd_master_dir->d_inode; |
| |
| if (undo) |
| goto fail_qinode; |
| |
| error = init_journal(sdp, undo); |
| if (error) |
| goto fail; |
| |
| /* Read in the master inode number inode */ |
| sdp->sd_inum_inode = gfs2_lookup_simple(master, "inum"); |
| if (IS_ERR(sdp->sd_inum_inode)) { |
| error = PTR_ERR(sdp->sd_inum_inode); |
| fs_err(sdp, "can't read in inum inode: %d\n", error); |
| goto fail_journal; |
| } |
| |
| |
| /* Read in the master statfs inode */ |
| sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs"); |
| if (IS_ERR(sdp->sd_statfs_inode)) { |
| error = PTR_ERR(sdp->sd_statfs_inode); |
| fs_err(sdp, "can't read in statfs inode: %d\n", error); |
| goto fail_inum; |
| } |
| |
| /* Read in the resource index inode */ |
| sdp->sd_rindex = gfs2_lookup_simple(master, "rindex"); |
| if (IS_ERR(sdp->sd_rindex)) { |
| error = PTR_ERR(sdp->sd_rindex); |
| fs_err(sdp, "can't get resource index inode: %d\n", error); |
| goto fail_statfs; |
| } |
| ip = GFS2_I(sdp->sd_rindex); |
| sdp->sd_rindex_uptodate = 0; |
| |
| /* Read in the quota inode */ |
| sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota"); |
| if (IS_ERR(sdp->sd_quota_inode)) { |
| error = PTR_ERR(sdp->sd_quota_inode); |
| fs_err(sdp, "can't get quota file inode: %d\n", error); |
| goto fail_rindex; |
| } |
| return 0; |
| |
| fail_qinode: |
| iput(sdp->sd_quota_inode); |
| fail_rindex: |
| gfs2_clear_rgrpd(sdp); |
| iput(sdp->sd_rindex); |
| fail_statfs: |
| iput(sdp->sd_statfs_inode); |
| fail_inum: |
| iput(sdp->sd_inum_inode); |
| fail_journal: |
| init_journal(sdp, UNDO); |
| fail: |
| return error; |
| } |
| |
| static int init_per_node(struct gfs2_sbd *sdp, int undo) |
| { |
| struct inode *pn = NULL; |
| char buf[30]; |
| int error = 0; |
| struct gfs2_inode *ip; |
| struct inode *master = sdp->sd_master_dir->d_inode; |
| |
| if (sdp->sd_args.ar_spectator) |
| return 0; |
| |
| if (undo) |
| goto fail_qc_gh; |
| |
| pn = gfs2_lookup_simple(master, "per_node"); |
| if (IS_ERR(pn)) { |
| error = PTR_ERR(pn); |
| fs_err(sdp, "can't find per_node directory: %d\n", error); |
| return error; |
| } |
| |
| sprintf(buf, "inum_range%u", sdp->sd_jdesc->jd_jid); |
| sdp->sd_ir_inode = gfs2_lookup_simple(pn, buf); |
| if (IS_ERR(sdp->sd_ir_inode)) { |
| error = PTR_ERR(sdp->sd_ir_inode); |
| fs_err(sdp, "can't find local \"ir\" file: %d\n", error); |
| goto fail; |
| } |
| |
| sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid); |
| sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf); |
| if (IS_ERR(sdp->sd_sc_inode)) { |
| error = PTR_ERR(sdp->sd_sc_inode); |
| fs_err(sdp, "can't find local \"sc\" file: %d\n", error); |
| goto fail_ir_i; |
| } |
| |
| sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid); |
| sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf); |
| if (IS_ERR(sdp->sd_qc_inode)) { |
| error = PTR_ERR(sdp->sd_qc_inode); |
| fs_err(sdp, "can't find local \"qc\" file: %d\n", error); |
| goto fail_ut_i; |
| } |
| |
| iput(pn); |
| pn = NULL; |
| |
| ip = GFS2_I(sdp->sd_ir_inode); |
| error = gfs2_glock_nq_init(ip->i_gl, |
| LM_ST_EXCLUSIVE, 0, |
| &sdp->sd_ir_gh); |
| if (error) { |
| fs_err(sdp, "can't lock local \"ir\" file: %d\n", error); |
| goto fail_qc_i; |
| } |
| |
| ip = GFS2_I(sdp->sd_sc_inode); |
| error = gfs2_glock_nq_init(ip->i_gl, |
| LM_ST_EXCLUSIVE, 0, |
| &sdp->sd_sc_gh); |
| if (error) { |
| fs_err(sdp, "can't lock local \"sc\" file: %d\n", error); |
| goto fail_ir_gh; |
| } |
| |
| ip = GFS2_I(sdp->sd_qc_inode); |
| error = gfs2_glock_nq_init(ip->i_gl, |
| LM_ST_EXCLUSIVE, 0, |
| &sdp->sd_qc_gh); |
| if (error) { |
| fs_err(sdp, "can't lock local \"qc\" file: %d\n", error); |
| goto fail_ut_gh; |
| } |
| |
| return 0; |
| |
| fail_qc_gh: |
| gfs2_glock_dq_uninit(&sdp->sd_qc_gh); |
| fail_ut_gh: |
| gfs2_glock_dq_uninit(&sdp->sd_sc_gh); |
| fail_ir_gh: |
| gfs2_glock_dq_uninit(&sdp->sd_ir_gh); |
| fail_qc_i: |
| iput(sdp->sd_qc_inode); |
| fail_ut_i: |
| iput(sdp->sd_sc_inode); |
| fail_ir_i: |
| iput(sdp->sd_ir_inode); |
| fail: |
| if (pn) |
| iput(pn); |
| return error; |
| } |
| |
| static int init_threads(struct gfs2_sbd *sdp, int undo) |
| { |
| struct task_struct *p; |
| int error = 0; |
| |
| if (undo) |
| goto fail_quotad; |
| |
| sdp->sd_log_flush_time = jiffies; |
| |
| p = kthread_run(gfs2_logd, sdp, "gfs2_logd"); |
| error = IS_ERR(p); |
| if (error) { |
| fs_err(sdp, "can't start logd thread: %d\n", error); |
| return error; |
| } |
| sdp->sd_logd_process = p; |
| |
| p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad"); |
| error = IS_ERR(p); |
| if (error) { |
| fs_err(sdp, "can't start quotad thread: %d\n", error); |
| goto fail; |
| } |
| sdp->sd_quotad_process = p; |
| |
| return 0; |
| |
| |
| fail_quotad: |
| kthread_stop(sdp->sd_quotad_process); |
| fail: |
| kthread_stop(sdp->sd_logd_process); |
| return error; |
| } |
| |
| static const match_table_t nolock_tokens = { |
| { Opt_jid, "jid=%d\n", }, |
| { Opt_err, NULL }, |
| }; |
| |
| static const struct lm_lockops nolock_ops = { |
| .lm_proto_name = "lock_nolock", |
| .lm_put_lock = kmem_cache_free, |
| .lm_tokens = &nolock_tokens, |
| }; |
| |
| /** |
| * gfs2_lm_mount - mount a locking protocol |
| * @sdp: the filesystem |
| * @args: mount arguements |
| * @silent: if 1, don't complain if the FS isn't a GFS2 fs |
| * |
| * Returns: errno |
| */ |
| |
| static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent) |
| { |
| const struct lm_lockops *lm; |
| struct lm_lockstruct *ls = &sdp->sd_lockstruct; |
| struct gfs2_args *args = &sdp->sd_args; |
| const char *proto = sdp->sd_proto_name; |
| const char *table = sdp->sd_table_name; |
| const char *fsname; |
| char *o, *options; |
| int ret; |
| |
| if (!strcmp("lock_nolock", proto)) { |
| lm = &nolock_ops; |
| sdp->sd_args.ar_localflocks = 1; |
| sdp->sd_args.ar_localcaching = 1; |
| #ifdef CONFIG_GFS2_FS_LOCKING_DLM |
| } else if (!strcmp("lock_dlm", proto)) { |
| lm = &gfs2_dlm_ops; |
| #endif |
| } else { |
| printk(KERN_INFO "GFS2: can't find protocol %s\n", proto); |
| return -ENOENT; |
| } |
| |
| fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table); |
| |
| ls->ls_ops = lm; |
| ls->ls_first = 1; |
| ls->ls_id = 0; |
| |
| for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) { |
| substring_t tmp[MAX_OPT_ARGS]; |
| int token, option; |
| |
| if (!o || !*o) |
| continue; |
| |
| token = match_token(o, *lm->lm_tokens, tmp); |
| switch (token) { |
| case Opt_jid: |
| ret = match_int(&tmp[0], &option); |
| if (ret || option < 0) |
| goto hostdata_error; |
| ls->ls_jid = option; |
| break; |
| case Opt_id: |
| ret = match_int(&tmp[0], &option); |
| if (ret) |
| goto hostdata_error; |
| ls->ls_id = option; |
| break; |
| case Opt_first: |
| ret = match_int(&tmp[0], &option); |
| if (ret || (option != 0 && option != 1)) |
| goto hostdata_error; |
| ls->ls_first = option; |
| break; |
| case Opt_nodir: |
| ret = match_int(&tmp[0], &option); |
| if (ret || (option != 0 && option != 1)) |
| goto hostdata_error; |
| ls->ls_nodir = option; |
| break; |
| case Opt_err: |
| default: |
| hostdata_error: |
| fs_info(sdp, "unknown hostdata (%s)\n", o); |
| return -EINVAL; |
| } |
| } |
| |
| if (sdp->sd_args.ar_spectator) |
| snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.s", table); |
| else |
| snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.%u", table, |
| sdp->sd_lockstruct.ls_jid); |
| |
| fsname = strchr(table, ':'); |
| if (fsname) |
| fsname++; |
| if (lm->lm_mount == NULL) { |
| fs_info(sdp, "Now mounting FS...\n"); |
| return 0; |
| } |
| ret = lm->lm_mount(sdp, fsname); |
| if (ret == 0) |
| fs_info(sdp, "Joined cluster. Now mounting FS...\n"); |
| return ret; |
| } |
| |
| void gfs2_lm_unmount(struct gfs2_sbd *sdp) |
| { |
| const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops; |
| if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) && |
| lm->lm_unmount) |
| lm->lm_unmount(sdp); |
| } |
| |
| /** |
| * fill_super - Read in superblock |
| * @sb: The VFS superblock |
| * @data: Mount options |
| * @silent: Don't complain if it's not a GFS2 filesystem |
| * |
| * Returns: errno |
| */ |
| |
| static int fill_super(struct super_block *sb, void *data, int silent) |
| { |
| struct gfs2_sbd *sdp; |
| struct gfs2_holder mount_gh; |
| int error; |
| |
| sdp = init_sbd(sb); |
| if (!sdp) { |
| printk(KERN_WARNING "GFS2: can't alloc struct gfs2_sbd\n"); |
| return -ENOMEM; |
| } |
| |
| sdp->sd_args.ar_quota = GFS2_QUOTA_DEFAULT; |
| sdp->sd_args.ar_data = GFS2_DATA_DEFAULT; |
| |
| error = gfs2_mount_args(sdp, &sdp->sd_args, data); |
| if (error) { |
| printk(KERN_WARNING "GFS2: can't parse mount arguments\n"); |
| goto fail; |
| } |
| |
| if (sdp->sd_args.ar_spectator) |
| sb->s_flags |= MS_RDONLY; |
| if (sdp->sd_args.ar_posix_acl) |
| sb->s_flags |= MS_POSIXACL; |
| |
| sb->s_magic = GFS2_MAGIC; |
| sb->s_op = &gfs2_super_ops; |
| sb->s_export_op = &gfs2_export_ops; |
| sb->s_time_gran = 1; |
| sb->s_maxbytes = MAX_LFS_FILESIZE; |
| |
| /* Set up the buffer cache and fill in some fake block size values |
| to allow us to read-in the on-disk superblock. */ |
| sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK); |
| sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits; |
| sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift - |
| GFS2_BASIC_BLOCK_SHIFT; |
| sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift; |
| |
| error = init_names(sdp, silent); |
| if (error) |
| goto fail; |
| |
| gfs2_create_debugfs_file(sdp); |
| |
| error = gfs2_sys_fs_add(sdp); |
| if (error) |
| goto fail; |
| |
| error = gfs2_lm_mount(sdp, silent); |
| if (error) |
| goto fail_sys; |
| |
| error = init_locking(sdp, &mount_gh, DO); |
| if (error) |
| goto fail_lm; |
| |
| error = init_sb(sdp, silent); |
| if (error) |
| goto fail_locking; |
| |
| error = init_inodes(sdp, DO); |
| if (error) |
| goto fail_sb; |
| |
| error = init_per_node(sdp, DO); |
| if (error) |
| goto fail_inodes; |
| |
| error = gfs2_statfs_init(sdp); |
| if (error) { |
| fs_err(sdp, "can't initialize statfs subsystem: %d\n", error); |
| goto fail_per_node; |
| } |
| |
| error = init_threads(sdp, DO); |
| if (error) |
| goto fail_per_node; |
| |
| if (!(sb->s_flags & MS_RDONLY)) { |
| error = gfs2_make_fs_rw(sdp); |
| if (error) { |
| fs_err(sdp, "can't make FS RW: %d\n", error); |
| goto fail_threads; |
| } |
| } |
| |
| gfs2_glock_dq_uninit(&mount_gh); |
| |
| return 0; |
| |
| fail_threads: |
| init_threads(sdp, UNDO); |
| fail_per_node: |
| init_per_node(sdp, UNDO); |
| fail_inodes: |
| init_inodes(sdp, UNDO); |
| fail_sb: |
| if (sdp->sd_root_dir) |
| dput(sdp->sd_root_dir); |
| if (sdp->sd_master_dir) |
| dput(sdp->sd_master_dir); |
| if (sb->s_root) |
| dput(sb->s_root); |
| sb->s_root = NULL; |
| fail_locking: |
| init_locking(sdp, &mount_gh, UNDO); |
| fail_lm: |
| gfs2_gl_hash_clear(sdp); |
| gfs2_lm_unmount(sdp); |
| while (invalidate_inodes(sb)) |
| yield(); |
| fail_sys: |
| gfs2_sys_fs_del(sdp); |
| fail: |
| gfs2_delete_debugfs_file(sdp); |
| kfree(sdp); |
| sb->s_fs_info = NULL; |
| return error; |
| } |
| |
| static int gfs2_get_sb(struct file_system_type *fs_type, int flags, |
| const char *dev_name, void *data, struct vfsmount *mnt) |
| { |
| return get_sb_bdev(fs_type, flags, dev_name, data, fill_super, mnt); |
| } |
| |
| static struct super_block *get_gfs2_sb(const char *dev_name) |
| { |
| struct super_block *sb; |
| struct nameidata nd; |
| int error; |
| |
| error = path_lookup(dev_name, LOOKUP_FOLLOW, &nd); |
| if (error) { |
| printk(KERN_WARNING "GFS2: path_lookup on %s returned error %d\n", |
| dev_name, error); |
| return NULL; |
| } |
| sb = nd.path.dentry->d_inode->i_sb; |
| if (sb && (sb->s_type == &gfs2_fs_type)) |
| atomic_inc(&sb->s_active); |
| else |
| sb = NULL; |
| path_put(&nd.path); |
| return sb; |
| } |
| |
| static int gfs2_get_sb_meta(struct file_system_type *fs_type, int flags, |
| const char *dev_name, void *data, struct vfsmount *mnt) |
| { |
| struct super_block *sb = NULL; |
| struct gfs2_sbd *sdp; |
| |
| sb = get_gfs2_sb(dev_name); |
| if (!sb) { |
| printk(KERN_WARNING "GFS2: gfs2 mount does not exist\n"); |
| return -ENOENT; |
| } |
| sdp = sb->s_fs_info; |
| mnt->mnt_sb = sb; |
| mnt->mnt_root = dget(sdp->sd_master_dir); |
| return 0; |
| } |
| |
| static void gfs2_kill_sb(struct super_block *sb) |
| { |
| struct gfs2_sbd *sdp = sb->s_fs_info; |
| |
| if (sdp == NULL) { |
| kill_block_super(sb); |
| return; |
| } |
| |
| gfs2_meta_syncfs(sdp); |
| dput(sdp->sd_root_dir); |
| dput(sdp->sd_master_dir); |
| sdp->sd_root_dir = NULL; |
| sdp->sd_master_dir = NULL; |
| shrink_dcache_sb(sb); |
| kill_block_super(sb); |
| gfs2_delete_debugfs_file(sdp); |
| kfree(sdp); |
| } |
| |
| struct file_system_type gfs2_fs_type = { |
| .name = "gfs2", |
| .fs_flags = FS_REQUIRES_DEV, |
| .get_sb = gfs2_get_sb, |
| .kill_sb = gfs2_kill_sb, |
| .owner = THIS_MODULE, |
| }; |
| |
| struct file_system_type gfs2meta_fs_type = { |
| .name = "gfs2meta", |
| .fs_flags = FS_REQUIRES_DEV, |
| .get_sb = gfs2_get_sb_meta, |
| .owner = THIS_MODULE, |
| }; |
| |