2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
7 * of the GNU General Public License version 2.
10 #include <linux/sched.h>
11 #include <linux/slab.h>
12 #include <linux/spinlock.h>
13 #include <linux/completion.h>
14 #include <linux/buffer_head.h>
15 #include <linux/blkdev.h>
16 #include <linux/kthread.h>
17 #include <linux/namei.h>
18 #include <linux/mount.h>
19 #include <linux/gfs2_ondisk.h>
20 #include <linux/lm_interface.h>
30 #include "ops_fstype.h"
31 #include "ops_dentry.h"
32 #include "ops_super.h"
43 static struct gfs2_sbd *init_sbd(struct super_block *sb)
47 sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL);
54 gfs2_tune_init(&sdp->sd_tune);
56 INIT_LIST_HEAD(&sdp->sd_reclaim_list);
57 spin_lock_init(&sdp->sd_reclaim_lock);
58 init_waitqueue_head(&sdp->sd_reclaim_wq);
60 mutex_init(&sdp->sd_inum_mutex);
61 spin_lock_init(&sdp->sd_statfs_spin);
62 mutex_init(&sdp->sd_statfs_mutex);
64 spin_lock_init(&sdp->sd_rindex_spin);
65 mutex_init(&sdp->sd_rindex_mutex);
66 INIT_LIST_HEAD(&sdp->sd_rindex_list);
67 INIT_LIST_HEAD(&sdp->sd_rindex_mru_list);
68 INIT_LIST_HEAD(&sdp->sd_rindex_recent_list);
70 INIT_LIST_HEAD(&sdp->sd_jindex_list);
71 spin_lock_init(&sdp->sd_jindex_spin);
72 mutex_init(&sdp->sd_jindex_mutex);
74 INIT_LIST_HEAD(&sdp->sd_quota_list);
75 spin_lock_init(&sdp->sd_quota_spin);
76 mutex_init(&sdp->sd_quota_mutex);
78 spin_lock_init(&sdp->sd_log_lock);
80 INIT_LIST_HEAD(&sdp->sd_log_le_gl);
81 INIT_LIST_HEAD(&sdp->sd_log_le_buf);
82 INIT_LIST_HEAD(&sdp->sd_log_le_revoke);
83 INIT_LIST_HEAD(&sdp->sd_log_le_rg);
84 INIT_LIST_HEAD(&sdp->sd_log_le_databuf);
86 mutex_init(&sdp->sd_log_reserve_mutex);
87 INIT_LIST_HEAD(&sdp->sd_ail1_list);
88 INIT_LIST_HEAD(&sdp->sd_ail2_list);
90 init_rwsem(&sdp->sd_log_flush_lock);
91 INIT_LIST_HEAD(&sdp->sd_log_flush_list);
93 INIT_LIST_HEAD(&sdp->sd_revoke_list);
95 mutex_init(&sdp->sd_freeze_lock);
100 static void init_vfs(struct super_block *sb, unsigned noatime)
102 struct gfs2_sbd *sdp = sb->s_fs_info;
104 sb->s_magic = GFS2_MAGIC;
105 sb->s_op = &gfs2_super_ops;
106 sb->s_export_op = &gfs2_export_ops;
108 sb->s_maxbytes = MAX_LFS_FILESIZE;
110 if (sb->s_flags & (MS_NOATIME | MS_NODIRATIME))
111 set_bit(noatime, &sdp->sd_flags);
113 /* Don't let the VFS update atimes. GFS2 handles this itself. */
114 sb->s_flags |= MS_NOATIME | MS_NODIRATIME;
117 static int init_names(struct gfs2_sbd *sdp, int silent)
122 proto = sdp->sd_args.ar_lockproto;
123 table = sdp->sd_args.ar_locktable;
125 /* Try to autodetect */
127 if (!proto[0] || !table[0]) {
128 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift);
132 error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
137 proto = sdp->sd_sb.sb_lockproto;
139 table = sdp->sd_sb.sb_locktable;
143 table = sdp->sd_vfs->s_id;
145 snprintf(sdp->sd_proto_name, GFS2_FSNAME_LEN, "%s", proto);
146 snprintf(sdp->sd_table_name, GFS2_FSNAME_LEN, "%s", table);
148 table = sdp->sd_table_name;
149 while ((table = strchr(table, '/')))
156 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
159 struct task_struct *p;
165 for (sdp->sd_glockd_num = 0;
166 sdp->sd_glockd_num < sdp->sd_args.ar_num_glockd;
167 sdp->sd_glockd_num++) {
168 p = kthread_run(gfs2_glockd, sdp, "gfs2_glockd");
171 fs_err(sdp, "can't start glockd thread: %d\n", error);
174 sdp->sd_glockd_process[sdp->sd_glockd_num] = p;
177 error = gfs2_glock_nq_num(sdp,
178 GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
179 LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
182 fs_err(sdp, "can't acquire mount glock: %d\n", error);
186 error = gfs2_glock_nq_num(sdp,
187 GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
189 LM_FLAG_NOEXP | GL_EXACT,
192 fs_err(sdp, "can't acquire live glock: %d\n", error);
196 error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
197 CREATE, &sdp->sd_rename_gl);
199 fs_err(sdp, "can't create rename glock: %d\n", error);
203 error = gfs2_glock_get(sdp, GFS2_TRANS_LOCK, &gfs2_trans_glops,
204 CREATE, &sdp->sd_trans_gl);
206 fs_err(sdp, "can't create transaction glock: %d\n", error);
209 set_bit(GLF_STICKY, &sdp->sd_trans_gl->gl_flags);
214 gfs2_glock_put(sdp->sd_trans_gl);
216 gfs2_glock_put(sdp->sd_rename_gl);
218 gfs2_glock_dq_uninit(&sdp->sd_live_gh);
220 gfs2_glock_dq_uninit(mount_gh);
222 while (sdp->sd_glockd_num--)
223 kthread_stop(sdp->sd_glockd_process[sdp->sd_glockd_num]);
228 static inline struct inode *gfs2_lookup_root(struct super_block *sb,
231 return gfs2_inode_lookup(sb, DT_DIR, no_addr, 0);
234 static int init_sb(struct gfs2_sbd *sdp, int silent, int undo)
236 struct super_block *sb = sdp->sd_vfs;
237 struct gfs2_holder sb_gh;
250 error = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
251 LM_ST_SHARED, 0, &sb_gh);
253 fs_err(sdp, "can't acquire superblock glock: %d\n", error);
257 error = gfs2_read_sb(sdp, sb_gh.gh_gl, silent);
259 fs_err(sdp, "can't read superblock: %d\n", error);
263 /* Set up the buffer cache and SB for real */
264 if (sdp->sd_sb.sb_bsize < bdev_hardsect_size(sb->s_bdev)) {
266 fs_err(sdp, "FS block size (%u) is too small for device "
268 sdp->sd_sb.sb_bsize, bdev_hardsect_size(sb->s_bdev));
271 if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
273 fs_err(sdp, "FS block size (%u) is too big for machine "
275 sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
278 sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
280 /* Get the root inode */
281 no_addr = sdp->sd_sb.sb_root_dir.no_addr;
282 if (sb->s_type == &gfs2meta_fs_type)
283 no_addr = sdp->sd_sb.sb_master_dir.no_addr;
284 inode = gfs2_lookup_root(sb, no_addr);
286 error = PTR_ERR(inode);
287 fs_err(sdp, "can't read in root inode: %d\n", error);
291 sb->s_root = d_alloc_root(inode);
293 fs_err(sdp, "can't get root dentry\n");
297 sb->s_root->d_op = &gfs2_dops;
300 gfs2_glock_dq_uninit(&sb_gh);
304 static int init_journal(struct gfs2_sbd *sdp, int undo)
306 struct gfs2_holder ji_gh;
307 struct task_struct *p;
308 struct gfs2_inode *ip;
317 sdp->sd_jindex = gfs2_lookup_simple(sdp->sd_master_dir, "jindex");
318 if (IS_ERR(sdp->sd_jindex)) {
319 fs_err(sdp, "can't lookup journal index: %d\n", error);
320 return PTR_ERR(sdp->sd_jindex);
322 ip = GFS2_I(sdp->sd_jindex);
323 set_bit(GLF_STICKY, &ip->i_gl->gl_flags);
325 /* Load in the journal index special file */
327 error = gfs2_jindex_hold(sdp, &ji_gh);
329 fs_err(sdp, "can't read journal index: %d\n", error);
334 if (!gfs2_jindex_size(sdp)) {
335 fs_err(sdp, "no journals!\n");
339 if (sdp->sd_args.ar_spectator) {
340 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
341 sdp->sd_log_blks_free = sdp->sd_jdesc->jd_blocks;
343 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
344 fs_err(sdp, "can't mount journal #%u\n",
345 sdp->sd_lockstruct.ls_jid);
346 fs_err(sdp, "there are only %u journals (0 - %u)\n",
347 gfs2_jindex_size(sdp),
348 gfs2_jindex_size(sdp) - 1);
351 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
353 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
355 LM_ST_EXCLUSIVE, LM_FLAG_NOEXP,
356 &sdp->sd_journal_gh);
358 fs_err(sdp, "can't acquire journal glock: %d\n", error);
362 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
363 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
364 LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE,
367 fs_err(sdp, "can't acquire journal inode glock: %d\n",
369 goto fail_journal_gh;
372 error = gfs2_jdesc_check(sdp->sd_jdesc);
374 fs_err(sdp, "my journal (%u) is bad: %d\n",
375 sdp->sd_jdesc->jd_jid, error);
378 sdp->sd_log_blks_free = sdp->sd_jdesc->jd_blocks;
381 if (sdp->sd_lockstruct.ls_first) {
383 for (x = 0; x < sdp->sd_journals; x++) {
384 error = gfs2_recover_journal(gfs2_jdesc_find(sdp, x));
386 fs_err(sdp, "error recovering journal %u: %d\n",
392 gfs2_lm_others_may_mount(sdp);
393 } else if (!sdp->sd_args.ar_spectator) {
394 error = gfs2_recover_journal(sdp->sd_jdesc);
396 fs_err(sdp, "error recovering my journal: %d\n", error);
401 set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
402 gfs2_glock_dq_uninit(&ji_gh);
405 p = kthread_run(gfs2_recoverd, sdp, "gfs2_recoverd");
408 fs_err(sdp, "can't start recoverd thread: %d\n", error);
411 sdp->sd_recoverd_process = p;
416 kthread_stop(sdp->sd_recoverd_process);
418 if (!sdp->sd_args.ar_spectator)
419 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
421 if (!sdp->sd_args.ar_spectator)
422 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
424 gfs2_jindex_free(sdp);
426 gfs2_glock_dq_uninit(&ji_gh);
428 iput(sdp->sd_jindex);
433 static int init_inodes(struct gfs2_sbd *sdp, int undo)
436 struct gfs2_inode *ip;
442 inode = gfs2_lookup_root(sdp->sd_vfs, sdp->sd_sb.sb_master_dir.no_addr);
444 error = PTR_ERR(inode);
445 fs_err(sdp, "can't read in master directory: %d\n", error);
448 sdp->sd_master_dir = inode;
450 error = init_journal(sdp, undo);
454 /* Read in the master inode number inode */
455 sdp->sd_inum_inode = gfs2_lookup_simple(sdp->sd_master_dir, "inum");
456 if (IS_ERR(sdp->sd_inum_inode)) {
457 error = PTR_ERR(sdp->sd_inum_inode);
458 fs_err(sdp, "can't read in inum inode: %d\n", error);
463 /* Read in the master statfs inode */
464 sdp->sd_statfs_inode = gfs2_lookup_simple(sdp->sd_master_dir, "statfs");
465 if (IS_ERR(sdp->sd_statfs_inode)) {
466 error = PTR_ERR(sdp->sd_statfs_inode);
467 fs_err(sdp, "can't read in statfs inode: %d\n", error);
471 /* Read in the resource index inode */
472 sdp->sd_rindex = gfs2_lookup_simple(sdp->sd_master_dir, "rindex");
473 if (IS_ERR(sdp->sd_rindex)) {
474 error = PTR_ERR(sdp->sd_rindex);
475 fs_err(sdp, "can't get resource index inode: %d\n", error);
478 ip = GFS2_I(sdp->sd_rindex);
479 set_bit(GLF_STICKY, &ip->i_gl->gl_flags);
480 sdp->sd_rindex_vn = ip->i_gl->gl_vn - 1;
482 /* Read in the quota inode */
483 sdp->sd_quota_inode = gfs2_lookup_simple(sdp->sd_master_dir, "quota");
484 if (IS_ERR(sdp->sd_quota_inode)) {
485 error = PTR_ERR(sdp->sd_quota_inode);
486 fs_err(sdp, "can't get quota file inode: %d\n", error);
492 iput(sdp->sd_quota_inode);
494 gfs2_clear_rgrpd(sdp);
495 iput(sdp->sd_rindex);
497 iput(sdp->sd_statfs_inode);
499 iput(sdp->sd_inum_inode);
501 init_journal(sdp, UNDO);
503 iput(sdp->sd_master_dir);
508 static int init_per_node(struct gfs2_sbd *sdp, int undo)
510 struct inode *pn = NULL;
513 struct gfs2_inode *ip;
515 if (sdp->sd_args.ar_spectator)
521 pn = gfs2_lookup_simple(sdp->sd_master_dir, "per_node");
524 fs_err(sdp, "can't find per_node directory: %d\n", error);
528 sprintf(buf, "inum_range%u", sdp->sd_jdesc->jd_jid);
529 sdp->sd_ir_inode = gfs2_lookup_simple(pn, buf);
530 if (IS_ERR(sdp->sd_ir_inode)) {
531 error = PTR_ERR(sdp->sd_ir_inode);
532 fs_err(sdp, "can't find local \"ir\" file: %d\n", error);
536 sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid);
537 sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf);
538 if (IS_ERR(sdp->sd_sc_inode)) {
539 error = PTR_ERR(sdp->sd_sc_inode);
540 fs_err(sdp, "can't find local \"sc\" file: %d\n", error);
544 sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
545 sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
546 if (IS_ERR(sdp->sd_qc_inode)) {
547 error = PTR_ERR(sdp->sd_qc_inode);
548 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
555 ip = GFS2_I(sdp->sd_ir_inode);
556 error = gfs2_glock_nq_init(ip->i_gl,
560 fs_err(sdp, "can't lock local \"ir\" file: %d\n", error);
564 ip = GFS2_I(sdp->sd_sc_inode);
565 error = gfs2_glock_nq_init(ip->i_gl,
569 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
573 ip = GFS2_I(sdp->sd_qc_inode);
574 error = gfs2_glock_nq_init(ip->i_gl,
578 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
585 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
587 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
589 gfs2_glock_dq_uninit(&sdp->sd_ir_gh);
591 iput(sdp->sd_qc_inode);
593 iput(sdp->sd_sc_inode);
595 iput(sdp->sd_ir_inode);
602 static int init_threads(struct gfs2_sbd *sdp, int undo)
604 struct task_struct *p;
610 sdp->sd_log_flush_time = jiffies;
611 sdp->sd_jindex_refresh_time = jiffies;
613 p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
616 fs_err(sdp, "can't start logd thread: %d\n", error);
619 sdp->sd_logd_process = p;
621 sdp->sd_statfs_sync_time = jiffies;
622 sdp->sd_quota_sync_time = jiffies;
624 p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
627 fs_err(sdp, "can't start quotad thread: %d\n", error);
630 sdp->sd_quotad_process = p;
636 kthread_stop(sdp->sd_quotad_process);
638 kthread_stop(sdp->sd_logd_process);
643 * fill_super - Read in superblock
644 * @sb: The VFS superblock
645 * @data: Mount options
646 * @silent: Don't complain if it's not a GFS2 filesystem
651 static int fill_super(struct super_block *sb, void *data, int silent)
653 struct gfs2_sbd *sdp;
654 struct gfs2_holder mount_gh;
659 printk(KERN_WARNING "GFS2: can't alloc struct gfs2_sbd\n");
663 error = gfs2_mount_args(sdp, (char *)data, 0);
665 printk(KERN_WARNING "GFS2: can't parse mount arguments\n");
669 init_vfs(sb, SDF_NOATIME);
671 /* Set up the buffer cache and fill in some fake block size values
672 to allow us to read-in the on-disk superblock. */
673 sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
674 sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
675 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
676 GFS2_BASIC_BLOCK_SHIFT;
677 sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
679 error = init_names(sdp, silent);
683 gfs2_create_debugfs_file(sdp);
685 error = gfs2_sys_fs_add(sdp);
689 error = gfs2_lm_mount(sdp, silent);
693 error = init_locking(sdp, &mount_gh, DO);
697 error = init_sb(sdp, silent, DO);
701 error = init_inodes(sdp, DO);
705 error = init_per_node(sdp, DO);
709 error = gfs2_statfs_init(sdp);
711 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
715 error = init_threads(sdp, DO);
719 if (!(sb->s_flags & MS_RDONLY)) {
720 error = gfs2_make_fs_rw(sdp);
722 fs_err(sdp, "can't make FS RW: %d\n", error);
727 gfs2_glock_dq_uninit(&mount_gh);
732 init_threads(sdp, UNDO);
734 init_per_node(sdp, UNDO);
736 init_inodes(sdp, UNDO);
738 init_sb(sdp, 0, UNDO);
740 init_locking(sdp, &mount_gh, UNDO);
742 gfs2_gl_hash_clear(sdp, WAIT);
743 gfs2_lm_unmount(sdp);
744 while (invalidate_inodes(sb))
747 gfs2_sys_fs_del(sdp);
749 gfs2_delete_debugfs_file(sdp);
751 sb->s_fs_info = NULL;
755 static int gfs2_get_sb(struct file_system_type *fs_type, int flags,
756 const char *dev_name, void *data, struct vfsmount *mnt)
758 struct super_block *sb;
759 struct gfs2_sbd *sdp;
760 int error = get_sb_bdev(fs_type, flags, dev_name, data, fill_super, mnt);
765 sdp->sd_gfs2mnt = mnt;
770 static int fill_super_meta(struct super_block *sb, struct super_block *new,
771 void *data, int silent)
773 struct gfs2_sbd *sdp = sb->s_fs_info;
777 new->s_fs_info = sdp;
778 sdp->sd_vfs_meta = sb;
780 init_vfs(new, SDF_NOATIME);
782 /* Get the master inode */
783 inode = igrab(sdp->sd_master_dir);
785 new->s_root = d_alloc_root(inode);
787 fs_err(sdp, "can't get root dentry\n");
791 new->s_root->d_op = &gfs2_dops;
796 static int set_bdev_super(struct super_block *s, void *data)
799 s->s_dev = s->s_bdev->bd_dev;
803 static int test_bdev_super(struct super_block *s, void *data)
805 return s->s_bdev == data;
808 static struct super_block* get_gfs2_sb(const char *dev_name)
812 struct file_system_type *fstype;
813 struct super_block *sb = NULL, *s;
816 error = path_lookup(dev_name, LOOKUP_FOLLOW, &nd);
818 printk(KERN_WARNING "GFS2: path_lookup on %s returned error\n",
822 error = vfs_getattr(nd.mnt, nd.dentry, &stat);
824 fstype = get_fs_type("gfs2");
825 list_for_each_entry(s, &fstype->fs_supers, s_instances) {
826 if ((S_ISBLK(stat.mode) && s->s_dev == stat.rdev) ||
827 (S_ISDIR(stat.mode) && s == nd.dentry->d_inode->i_sb)) {
833 printk(KERN_WARNING "GFS2: Unrecognized block device or "
834 "mount point %s\n", dev_name);
842 static int gfs2_get_sb_meta(struct file_system_type *fs_type, int flags,
843 const char *dev_name, void *data, struct vfsmount *mnt)
846 struct super_block *sb = NULL, *new;
847 struct gfs2_sbd *sdp;
849 sb = get_gfs2_sb(dev_name);
851 printk(KERN_WARNING "GFS2: gfs2 mount does not exist\n");
856 if (sdp->sd_vfs_meta) {
857 printk(KERN_WARNING "GFS2: gfs2meta mount already exists\n");
861 down(&sb->s_bdev->bd_mount_sem);
862 new = sget(fs_type, test_bdev_super, set_bdev_super, sb->s_bdev);
863 up(&sb->s_bdev->bd_mount_sem);
865 error = PTR_ERR(new);
868 module_put(fs_type->owner);
869 new->s_flags = flags;
870 strlcpy(new->s_id, sb->s_id, sizeof(new->s_id));
871 sb_set_blocksize(new, sb->s_blocksize);
872 error = fill_super_meta(sb, new, data, flags & MS_SILENT ? 1 : 0);
874 up_write(&new->s_umount);
875 deactivate_super(new);
879 new->s_flags |= MS_ACTIVE;
881 /* Grab a reference to the gfs2 mount point */
882 atomic_inc(&sdp->sd_gfs2mnt->mnt_count);
883 return simple_set_mnt(mnt, new);
888 static void gfs2_kill_sb(struct super_block *sb)
890 gfs2_delete_debugfs_file(sb->s_fs_info);
891 gfs2_meta_syncfs(sb->s_fs_info);
892 kill_block_super(sb);
895 static void gfs2_kill_sb_meta(struct super_block *sb)
897 struct gfs2_sbd *sdp = sb->s_fs_info;
898 generic_shutdown_super(sb);
899 sdp->sd_vfs_meta = NULL;
900 atomic_dec(&sdp->sd_gfs2mnt->mnt_count);
903 struct file_system_type gfs2_fs_type = {
905 .fs_flags = FS_REQUIRES_DEV,
906 .get_sb = gfs2_get_sb,
907 .kill_sb = gfs2_kill_sb,
908 .owner = THIS_MODULE,
911 struct file_system_type gfs2meta_fs_type = {
913 .fs_flags = FS_REQUIRES_DEV,
914 .get_sb = gfs2_get_sb_meta,
915 .kill_sb = gfs2_kill_sb_meta,
916 .owner = THIS_MODULE,