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
gfs2_tune_init(struct gfs2_tune * gt)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
free_sbd(struct gfs2_sbd * sdp)65 void free_sbd(struct gfs2_sbd *sdp)
66 {
67 struct super_block *sb = sdp->sd_vfs;
68
69 free_percpu(sdp->sd_lkstats);
70 sb->s_fs_info = NULL;
71 kfree(sdp);
72 }
73
init_sbd(struct super_block * sb)74 static struct gfs2_sbd *init_sbd(struct super_block *sb)
75 {
76 struct gfs2_sbd *sdp;
77
78 sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL);
79 if (!sdp)
80 return NULL;
81
82 sdp->sd_vfs = sb;
83 sdp->sd_lkstats = alloc_percpu(struct gfs2_pcpu_lkstats);
84 if (!sdp->sd_lkstats)
85 goto fail;
86 sb->s_fs_info = sdp;
87
88 set_bit(SDF_NOJOURNALID, &sdp->sd_flags);
89 gfs2_tune_init(&sdp->sd_tune);
90
91 init_waitqueue_head(&sdp->sd_kill_wait);
92 init_waitqueue_head(&sdp->sd_async_glock_wait);
93 atomic_set(&sdp->sd_glock_disposal, 0);
94 init_completion(&sdp->sd_locking_init);
95 init_completion(&sdp->sd_wdack);
96 spin_lock_init(&sdp->sd_statfs_spin);
97
98 spin_lock_init(&sdp->sd_rindex_spin);
99 sdp->sd_rindex_tree.rb_node = NULL;
100
101 INIT_LIST_HEAD(&sdp->sd_jindex_list);
102 spin_lock_init(&sdp->sd_jindex_spin);
103 mutex_init(&sdp->sd_jindex_mutex);
104 init_completion(&sdp->sd_journal_ready);
105
106 INIT_LIST_HEAD(&sdp->sd_quota_list);
107 mutex_init(&sdp->sd_quota_sync_mutex);
108 init_waitqueue_head(&sdp->sd_quota_wait);
109 spin_lock_init(&sdp->sd_bitmap_lock);
110
111 INIT_LIST_HEAD(&sdp->sd_sc_inodes_list);
112
113 spin_lock_init(&sdp->sd_log_lock);
114 atomic_set(&sdp->sd_log_pinned, 0);
115 INIT_LIST_HEAD(&sdp->sd_log_revokes);
116 INIT_LIST_HEAD(&sdp->sd_log_ordered);
117 spin_lock_init(&sdp->sd_ordered_lock);
118
119 init_waitqueue_head(&sdp->sd_log_waitq);
120 init_waitqueue_head(&sdp->sd_logd_waitq);
121 spin_lock_init(&sdp->sd_ail_lock);
122 INIT_LIST_HEAD(&sdp->sd_ail1_list);
123 INIT_LIST_HEAD(&sdp->sd_ail2_list);
124
125 init_rwsem(&sdp->sd_log_flush_lock);
126 atomic_set(&sdp->sd_log_in_flight, 0);
127 init_waitqueue_head(&sdp->sd_log_flush_wait);
128 mutex_init(&sdp->sd_freeze_mutex);
129 INIT_LIST_HEAD(&sdp->sd_dead_glocks);
130
131 return sdp;
132
133 fail:
134 free_sbd(sdp);
135 return NULL;
136 }
137
138 /**
139 * gfs2_check_sb - Check superblock
140 * @sdp: the filesystem
141 * @silent: Don't print a message if the check fails
142 *
143 * Checks the version code of the FS is one that we understand how to
144 * read and that the sizes of the various on-disk structures have not
145 * changed.
146 */
147
gfs2_check_sb(struct gfs2_sbd * sdp,int silent)148 static int gfs2_check_sb(struct gfs2_sbd *sdp, int silent)
149 {
150 struct gfs2_sb_host *sb = &sdp->sd_sb;
151
152 if (sb->sb_magic != GFS2_MAGIC ||
153 sb->sb_type != GFS2_METATYPE_SB) {
154 if (!silent)
155 pr_warn("not a GFS2 filesystem\n");
156 return -EINVAL;
157 }
158
159 if (sb->sb_fs_format < GFS2_FS_FORMAT_MIN ||
160 sb->sb_fs_format > GFS2_FS_FORMAT_MAX ||
161 sb->sb_multihost_format != GFS2_FORMAT_MULTI) {
162 fs_warn(sdp, "Unknown on-disk format, unable to mount\n");
163 return -EINVAL;
164 }
165
166 if (sb->sb_bsize < SECTOR_SIZE || sb->sb_bsize > PAGE_SIZE ||
167 (sb->sb_bsize & (sb->sb_bsize - 1))) {
168 pr_warn("Invalid block size\n");
169 return -EINVAL;
170 }
171 if (sb->sb_bsize_shift != ffs(sb->sb_bsize) - 1) {
172 pr_warn("Invalid block size shift\n");
173 return -EINVAL;
174 }
175 return 0;
176 }
177
gfs2_sb_in(struct gfs2_sbd * sdp,const struct gfs2_sb * str)178 static void gfs2_sb_in(struct gfs2_sbd *sdp, const struct gfs2_sb *str)
179 {
180 struct gfs2_sb_host *sb = &sdp->sd_sb;
181 struct super_block *s = sdp->sd_vfs;
182
183 sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic);
184 sb->sb_type = be32_to_cpu(str->sb_header.mh_type);
185 sb->sb_fs_format = be32_to_cpu(str->sb_fs_format);
186 sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format);
187 sb->sb_bsize = be32_to_cpu(str->sb_bsize);
188 sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift);
189 sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr);
190 sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino);
191 sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr);
192 sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino);
193
194 memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN);
195 memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN);
196 super_set_uuid(s, str->sb_uuid, 16);
197 }
198
199 /**
200 * gfs2_read_super - Read the gfs2 super block from disk
201 * @sdp: The GFS2 super block
202 * @sector: The location of the super block
203 * @silent: Don't print a message if the check fails
204 *
205 * This uses the bio functions to read the super block from disk
206 * because we want to be 100% sure that we never read cached data.
207 * A super block is read twice only during each GFS2 mount and is
208 * never written to by the filesystem. The first time its read no
209 * locks are held, and the only details which are looked at are those
210 * relating to the locking protocol. Once locking is up and working,
211 * the sb is read again under the lock to establish the location of
212 * the master directory (contains pointers to journals etc) and the
213 * root directory.
214 *
215 * Returns: 0 on success or error
216 */
217
gfs2_read_super(struct gfs2_sbd * sdp,sector_t sector,int silent)218 static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector, int silent)
219 {
220 struct gfs2_sb *sb;
221 int err;
222
223 sb = kmalloc(PAGE_SIZE, GFP_KERNEL);
224 if (unlikely(!sb))
225 return -ENOMEM;
226 err = bdev_rw_virt(sdp->sd_vfs->s_bdev,
227 sector << (sdp->sd_vfs->s_blocksize_bits - SECTOR_SHIFT),
228 sb, PAGE_SIZE, REQ_OP_READ | REQ_META);
229 if (err) {
230 pr_warn("error %d reading superblock\n", err);
231 kfree(sb);
232 return err;
233 }
234 gfs2_sb_in(sdp, sb);
235 kfree(sb);
236 return gfs2_check_sb(sdp, silent);
237 }
238
239 /**
240 * gfs2_read_sb - Read super block
241 * @sdp: The GFS2 superblock
242 * @silent: Don't print message if mount fails
243 *
244 */
245
gfs2_read_sb(struct gfs2_sbd * sdp,int silent)246 static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent)
247 {
248 u32 hash_blocks, ind_blocks, leaf_blocks;
249 u32 tmp_blocks;
250 unsigned int x;
251 int error;
252
253 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
254 if (error) {
255 if (!silent)
256 fs_err(sdp, "can't read superblock\n");
257 return error;
258 }
259
260 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift - SECTOR_SHIFT;
261 sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift);
262 sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
263 sizeof(struct gfs2_dinode)) / sizeof(u64);
264 sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
265 sizeof(struct gfs2_meta_header)) / sizeof(u64);
266 sdp->sd_ldptrs = (sdp->sd_sb.sb_bsize -
267 sizeof(struct gfs2_log_descriptor)) / sizeof(u64);
268 sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
269 sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
270 sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
271 sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64);
272 sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
273 sizeof(struct gfs2_meta_header)) /
274 sizeof(struct gfs2_quota_change);
275 sdp->sd_blocks_per_bitmap = (sdp->sd_sb.sb_bsize -
276 sizeof(struct gfs2_meta_header))
277 * GFS2_NBBY; /* not the rgrp bitmap, subsequent bitmaps only */
278
279 /*
280 * We always keep at least one block reserved for revokes in
281 * transactions. This greatly simplifies allocating additional
282 * revoke blocks.
283 */
284 atomic_set(&sdp->sd_log_revokes_available, sdp->sd_ldptrs);
285
286 /* Compute maximum reservation required to add a entry to a directory */
287
288 hash_blocks = DIV_ROUND_UP(sizeof(u64) * BIT(GFS2_DIR_MAX_DEPTH),
289 sdp->sd_jbsize);
290
291 ind_blocks = 0;
292 for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
293 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
294 ind_blocks += tmp_blocks;
295 }
296
297 leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
298
299 sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
300
301 sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
302 sizeof(struct gfs2_dinode);
303 sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
304 for (x = 2;; x++) {
305 u64 space, d;
306 u32 m;
307
308 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
309 d = space;
310 m = do_div(d, sdp->sd_inptrs);
311
312 if (d != sdp->sd_heightsize[x - 1] || m)
313 break;
314 sdp->sd_heightsize[x] = space;
315 }
316 sdp->sd_max_height = x;
317 sdp->sd_heightsize[x] = ~0;
318 gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
319
320 sdp->sd_max_dents_per_leaf = (sdp->sd_sb.sb_bsize -
321 sizeof(struct gfs2_leaf)) /
322 GFS2_MIN_DIRENT_SIZE;
323 return 0;
324 }
325
init_names(struct gfs2_sbd * sdp,int silent)326 static int init_names(struct gfs2_sbd *sdp, int silent)
327 {
328 char *proto, *table;
329 int error = 0;
330
331 proto = sdp->sd_args.ar_lockproto;
332 table = sdp->sd_args.ar_locktable;
333
334 /* Try to autodetect */
335
336 if (!proto[0] || !table[0]) {
337 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
338 if (error)
339 return error;
340
341 if (!proto[0])
342 proto = sdp->sd_sb.sb_lockproto;
343 if (!table[0])
344 table = sdp->sd_sb.sb_locktable;
345 }
346
347 if (!table[0])
348 table = sdp->sd_vfs->s_id;
349
350 BUILD_BUG_ON(GFS2_LOCKNAME_LEN > GFS2_FSNAME_LEN);
351
352 strscpy(sdp->sd_proto_name, proto, GFS2_LOCKNAME_LEN);
353 strscpy(sdp->sd_table_name, table, GFS2_LOCKNAME_LEN);
354
355 table = sdp->sd_table_name;
356 while ((table = strchr(table, '/')))
357 *table = '_';
358
359 return error;
360 }
361
init_locking(struct gfs2_sbd * sdp,struct gfs2_holder * mount_gh,int undo)362 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
363 int undo)
364 {
365 int error = 0;
366
367 if (undo)
368 goto fail_trans;
369
370 error = gfs2_glock_nq_num(sdp,
371 GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
372 LM_ST_EXCLUSIVE,
373 LM_FLAG_NOEXP | GL_NOCACHE | GL_NOPID,
374 mount_gh);
375 if (error) {
376 fs_err(sdp, "can't acquire mount glock: %d\n", error);
377 goto fail;
378 }
379
380 error = gfs2_glock_nq_num(sdp,
381 GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
382 LM_ST_SHARED,
383 LM_FLAG_NOEXP | GL_EXACT | GL_NOPID,
384 &sdp->sd_live_gh);
385 if (error) {
386 fs_err(sdp, "can't acquire live glock: %d\n", error);
387 goto fail_mount;
388 }
389
390 error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
391 CREATE, &sdp->sd_rename_gl);
392 if (error) {
393 fs_err(sdp, "can't create rename glock: %d\n", error);
394 goto fail_live;
395 }
396
397 error = gfs2_glock_get(sdp, GFS2_FREEZE_LOCK, &gfs2_freeze_glops,
398 CREATE, &sdp->sd_freeze_gl);
399 if (error) {
400 fs_err(sdp, "can't create freeze glock: %d\n", error);
401 goto fail_rename;
402 }
403
404 return 0;
405
406 fail_trans:
407 gfs2_glock_put(sdp->sd_freeze_gl);
408 fail_rename:
409 gfs2_glock_put(sdp->sd_rename_gl);
410 fail_live:
411 gfs2_glock_dq_uninit(&sdp->sd_live_gh);
412 fail_mount:
413 gfs2_glock_dq_uninit(mount_gh);
414 fail:
415 return error;
416 }
417
gfs2_lookup_root(struct super_block * sb,struct dentry ** dptr,u64 no_addr,const char * name)418 static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr,
419 u64 no_addr, const char *name)
420 {
421 struct gfs2_sbd *sdp = sb->s_fs_info;
422 struct dentry *dentry;
423 struct inode *inode;
424
425 inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0,
426 GFS2_BLKST_FREE /* ignore */);
427 if (IS_ERR(inode)) {
428 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode));
429 return PTR_ERR(inode);
430 }
431 dentry = d_make_root(inode);
432 if (!dentry) {
433 fs_err(sdp, "can't alloc %s dentry\n", name);
434 return -ENOMEM;
435 }
436 *dptr = dentry;
437 return 0;
438 }
439
init_sb(struct gfs2_sbd * sdp,int silent)440 static int init_sb(struct gfs2_sbd *sdp, int silent)
441 {
442 struct super_block *sb = sdp->sd_vfs;
443 struct gfs2_holder sb_gh;
444 u64 no_addr;
445 int ret;
446
447 ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
448 LM_ST_SHARED, 0, &sb_gh);
449 if (ret) {
450 fs_err(sdp, "can't acquire superblock glock: %d\n", ret);
451 return ret;
452 }
453
454 ret = gfs2_read_sb(sdp, silent);
455 if (ret) {
456 fs_err(sdp, "can't read superblock: %d\n", ret);
457 goto out;
458 }
459
460 switch(sdp->sd_sb.sb_fs_format) {
461 case GFS2_FS_FORMAT_MAX:
462 sb->s_xattr = gfs2_xattr_handlers_max;
463 break;
464
465 case GFS2_FS_FORMAT_MIN:
466 sb->s_xattr = gfs2_xattr_handlers_min;
467 break;
468
469 default:
470 BUG();
471 }
472
473 /* Set up the buffer cache and SB for real */
474 if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) {
475 ret = -EINVAL;
476 fs_err(sdp, "FS block size (%u) is too small for device "
477 "block size (%u)\n",
478 sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev));
479 goto out;
480 }
481 if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
482 ret = -EINVAL;
483 fs_err(sdp, "FS block size (%u) is too big for machine "
484 "page size (%u)\n",
485 sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
486 goto out;
487 }
488 ret = -EINVAL;
489 if (!sb_set_blocksize(sb, sdp->sd_sb.sb_bsize))
490 goto out;
491
492 /* Get the root inode */
493 no_addr = sdp->sd_sb.sb_root_dir.no_addr;
494 ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root");
495 if (ret)
496 goto out;
497
498 /* Get the master inode */
499 no_addr = sdp->sd_sb.sb_master_dir.no_addr;
500 ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master");
501 if (ret) {
502 dput(sdp->sd_root_dir);
503 goto out;
504 }
505 sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir);
506 out:
507 gfs2_glock_dq_uninit(&sb_gh);
508 return ret;
509 }
510
gfs2_others_may_mount(struct gfs2_sbd * sdp)511 static void gfs2_others_may_mount(struct gfs2_sbd *sdp)
512 {
513 char *message = "FIRSTMOUNT=Done";
514 char *envp[] = { message, NULL };
515
516 fs_info(sdp, "first mount done, others may mount\n");
517
518 if (sdp->sd_lockstruct.ls_ops->lm_first_done)
519 sdp->sd_lockstruct.ls_ops->lm_first_done(sdp);
520
521 kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp);
522 }
523
524 /**
525 * gfs2_jindex_hold - Grab a lock on the jindex
526 * @sdp: The GFS2 superblock
527 * @ji_gh: the holder for the jindex glock
528 *
529 * Returns: errno
530 */
531
gfs2_jindex_hold(struct gfs2_sbd * sdp,struct gfs2_holder * ji_gh)532 static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
533 {
534 struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex);
535 struct qstr name;
536 char buf[20];
537 struct gfs2_jdesc *jd;
538 int error;
539
540 name.name = buf;
541
542 mutex_lock(&sdp->sd_jindex_mutex);
543
544 for (;;) {
545 struct gfs2_inode *jip;
546
547 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh);
548 if (error)
549 break;
550
551 name.len = sprintf(buf, "journal%u", sdp->sd_journals);
552 name.hash = gfs2_disk_hash(name.name, name.len);
553
554 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL);
555 if (error == -ENOENT) {
556 error = 0;
557 break;
558 }
559
560 gfs2_glock_dq_uninit(ji_gh);
561
562 if (error)
563 break;
564
565 error = -ENOMEM;
566 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
567 if (!jd)
568 break;
569
570 INIT_LIST_HEAD(&jd->extent_list);
571 INIT_LIST_HEAD(&jd->jd_revoke_list);
572
573 INIT_WORK(&jd->jd_work, gfs2_recover_func);
574 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1);
575 if (IS_ERR_OR_NULL(jd->jd_inode)) {
576 if (!jd->jd_inode)
577 error = -ENOENT;
578 else
579 error = PTR_ERR(jd->jd_inode);
580 kfree(jd);
581 break;
582 }
583
584 d_mark_dontcache(jd->jd_inode);
585 spin_lock(&sdp->sd_jindex_spin);
586 jd->jd_jid = sdp->sd_journals++;
587 jip = GFS2_I(jd->jd_inode);
588 jd->jd_no_addr = jip->i_no_addr;
589 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
590 spin_unlock(&sdp->sd_jindex_spin);
591 }
592
593 mutex_unlock(&sdp->sd_jindex_mutex);
594
595 return error;
596 }
597
598 /**
599 * init_statfs - look up and initialize master and local (per node) statfs inodes
600 * @sdp: The GFS2 superblock
601 *
602 * This should be called after the jindex is initialized in init_journal() and
603 * before gfs2_journal_recovery() is called because we need to be able to write
604 * to these inodes during recovery.
605 *
606 * Returns: errno
607 */
init_statfs(struct gfs2_sbd * sdp)608 static int init_statfs(struct gfs2_sbd *sdp)
609 {
610 int error = 0;
611 struct inode *master = d_inode(sdp->sd_master_dir);
612 struct inode *pn = NULL;
613 char buf[30];
614 struct gfs2_jdesc *jd;
615 struct gfs2_inode *ip;
616
617 sdp->sd_statfs_inode = gfs2_lookup_meta(master, "statfs");
618 if (IS_ERR(sdp->sd_statfs_inode)) {
619 error = PTR_ERR(sdp->sd_statfs_inode);
620 fs_err(sdp, "can't read in statfs inode: %d\n", error);
621 goto out;
622 }
623 if (sdp->sd_args.ar_spectator)
624 goto out;
625
626 pn = gfs2_lookup_meta(master, "per_node");
627 if (IS_ERR(pn)) {
628 error = PTR_ERR(pn);
629 fs_err(sdp, "can't find per_node directory: %d\n", error);
630 goto put_statfs;
631 }
632
633 /* For each jid, lookup the corresponding local statfs inode in the
634 * per_node metafs directory and save it in the sdp->sd_sc_inodes_list. */
635 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
636 struct local_statfs_inode *lsi =
637 kmalloc(sizeof(struct local_statfs_inode), GFP_NOFS);
638 if (!lsi) {
639 error = -ENOMEM;
640 goto free_local;
641 }
642 sprintf(buf, "statfs_change%u", jd->jd_jid);
643 lsi->si_sc_inode = gfs2_lookup_meta(pn, buf);
644 if (IS_ERR(lsi->si_sc_inode)) {
645 error = PTR_ERR(lsi->si_sc_inode);
646 fs_err(sdp, "can't find local \"sc\" file#%u: %d\n",
647 jd->jd_jid, error);
648 kfree(lsi);
649 goto free_local;
650 }
651 lsi->si_jid = jd->jd_jid;
652 if (jd->jd_jid == sdp->sd_jdesc->jd_jid)
653 sdp->sd_sc_inode = lsi->si_sc_inode;
654
655 list_add_tail(&lsi->si_list, &sdp->sd_sc_inodes_list);
656 }
657
658 iput(pn);
659 pn = NULL;
660 ip = GFS2_I(sdp->sd_sc_inode);
661 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_NOPID,
662 &sdp->sd_sc_gh);
663 if (error) {
664 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
665 goto free_local;
666 }
667 /* read in the local statfs buffer - other nodes don't change it. */
668 error = gfs2_meta_inode_buffer(ip, &sdp->sd_sc_bh);
669 if (error) {
670 fs_err(sdp, "Cannot read in local statfs: %d\n", error);
671 goto unlock_sd_gh;
672 }
673 return 0;
674
675 unlock_sd_gh:
676 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
677 free_local:
678 free_local_statfs_inodes(sdp);
679 iput(pn);
680 put_statfs:
681 iput(sdp->sd_statfs_inode);
682 out:
683 return error;
684 }
685
686 /* Uninitialize and free up memory used by the list of statfs inodes */
uninit_statfs(struct gfs2_sbd * sdp)687 static void uninit_statfs(struct gfs2_sbd *sdp)
688 {
689 if (!sdp->sd_args.ar_spectator) {
690 brelse(sdp->sd_sc_bh);
691 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
692 free_local_statfs_inodes(sdp);
693 }
694 iput(sdp->sd_statfs_inode);
695 }
696
init_journal(struct gfs2_sbd * sdp,int undo)697 static int init_journal(struct gfs2_sbd *sdp, int undo)
698 {
699 struct inode *master = d_inode(sdp->sd_master_dir);
700 struct gfs2_holder ji_gh;
701 struct gfs2_inode *ip;
702 int error = 0;
703
704 gfs2_holder_mark_uninitialized(&ji_gh);
705 if (undo)
706 goto fail_statfs;
707
708 sdp->sd_jindex = gfs2_lookup_meta(master, "jindex");
709 if (IS_ERR(sdp->sd_jindex)) {
710 fs_err(sdp, "can't lookup journal index: %d\n", error);
711 return PTR_ERR(sdp->sd_jindex);
712 }
713
714 /* Load in the journal index special file */
715
716 error = gfs2_jindex_hold(sdp, &ji_gh);
717 if (error) {
718 fs_err(sdp, "can't read journal index: %d\n", error);
719 goto fail;
720 }
721
722 error = -EUSERS;
723 if (!gfs2_jindex_size(sdp)) {
724 fs_err(sdp, "no journals!\n");
725 goto fail_jindex;
726 }
727
728 atomic_set(&sdp->sd_log_blks_needed, 0);
729 if (sdp->sd_args.ar_spectator) {
730 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
731 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
732 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
733 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
734 } else {
735 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
736 fs_err(sdp, "can't mount journal #%u\n",
737 sdp->sd_lockstruct.ls_jid);
738 fs_err(sdp, "there are only %u journals (0 - %u)\n",
739 gfs2_jindex_size(sdp),
740 gfs2_jindex_size(sdp) - 1);
741 goto fail_jindex;
742 }
743 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
744
745 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
746 &gfs2_journal_glops,
747 LM_ST_EXCLUSIVE,
748 LM_FLAG_NOEXP | GL_NOCACHE | GL_NOPID,
749 &sdp->sd_journal_gh);
750 if (error) {
751 fs_err(sdp, "can't acquire journal glock: %d\n", error);
752 goto fail_jindex;
753 }
754
755 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
756 sdp->sd_jinode_gl = ip->i_gl;
757 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
758 LM_FLAG_NOEXP | GL_EXACT |
759 GL_NOCACHE | GL_NOPID,
760 &sdp->sd_jinode_gh);
761 if (error) {
762 fs_err(sdp, "can't acquire journal inode glock: %d\n",
763 error);
764 goto fail_journal_gh;
765 }
766
767 error = gfs2_jdesc_check(sdp->sd_jdesc);
768 if (error) {
769 fs_err(sdp, "my journal (%u) is bad: %d\n",
770 sdp->sd_jdesc->jd_jid, error);
771 goto fail_jinode_gh;
772 }
773 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
774 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
775 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
776
777 /* Map the extents for this journal's blocks */
778 gfs2_map_journal_extents(sdp, sdp->sd_jdesc);
779 }
780 trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free));
781
782 /* Lookup statfs inodes here so journal recovery can use them. */
783 error = init_statfs(sdp);
784 if (error)
785 goto fail_jinode_gh;
786
787 if (sdp->sd_lockstruct.ls_first) {
788 unsigned int x;
789 for (x = 0; x < sdp->sd_journals; x++) {
790 struct gfs2_jdesc *jd = gfs2_jdesc_find(sdp, x);
791
792 if (sdp->sd_args.ar_spectator) {
793 error = check_journal_clean(sdp, jd, true);
794 if (error)
795 goto fail_statfs;
796 continue;
797 }
798 error = gfs2_recover_journal(jd, true);
799 if (error) {
800 fs_err(sdp, "error recovering journal %u: %d\n",
801 x, error);
802 goto fail_statfs;
803 }
804 }
805
806 gfs2_others_may_mount(sdp);
807 } else if (!sdp->sd_args.ar_spectator) {
808 error = gfs2_recover_journal(sdp->sd_jdesc, true);
809 if (error) {
810 fs_err(sdp, "error recovering my journal: %d\n", error);
811 goto fail_statfs;
812 }
813 }
814
815 sdp->sd_log_idle = 1;
816 set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
817 gfs2_glock_dq_uninit(&ji_gh);
818 INIT_WORK(&sdp->sd_freeze_work, gfs2_freeze_func);
819 return 0;
820
821 fail_statfs:
822 uninit_statfs(sdp);
823 fail_jinode_gh:
824 /* A withdraw may have done dq/uninit so now we need to check it */
825 if (!sdp->sd_args.ar_spectator &&
826 gfs2_holder_initialized(&sdp->sd_jinode_gh))
827 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
828 fail_journal_gh:
829 if (!sdp->sd_args.ar_spectator &&
830 gfs2_holder_initialized(&sdp->sd_journal_gh))
831 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
832 fail_jindex:
833 gfs2_jindex_free(sdp);
834 if (gfs2_holder_initialized(&ji_gh))
835 gfs2_glock_dq_uninit(&ji_gh);
836 fail:
837 iput(sdp->sd_jindex);
838 return error;
839 }
840
841 static struct lock_class_key gfs2_quota_imutex_key;
842
init_inodes(struct gfs2_sbd * sdp,int undo)843 static int init_inodes(struct gfs2_sbd *sdp, int undo)
844 {
845 int error = 0;
846 struct inode *master = d_inode(sdp->sd_master_dir);
847
848 if (undo)
849 goto fail_qinode;
850
851 error = init_journal(sdp, undo);
852 complete_all(&sdp->sd_journal_ready);
853 if (error)
854 goto fail;
855
856 /* Read in the resource index inode */
857 sdp->sd_rindex = gfs2_lookup_meta(master, "rindex");
858 if (IS_ERR(sdp->sd_rindex)) {
859 error = PTR_ERR(sdp->sd_rindex);
860 fs_err(sdp, "can't get resource index inode: %d\n", error);
861 goto fail_journal;
862 }
863 sdp->sd_rindex_uptodate = 0;
864
865 /* Read in the quota inode */
866 sdp->sd_quota_inode = gfs2_lookup_meta(master, "quota");
867 if (IS_ERR(sdp->sd_quota_inode)) {
868 error = PTR_ERR(sdp->sd_quota_inode);
869 fs_err(sdp, "can't get quota file inode: %d\n", error);
870 goto fail_rindex;
871 }
872 /*
873 * i_rwsem on quota files is special. Since this inode is hidden system
874 * file, we are safe to define locking ourselves.
875 */
876 lockdep_set_class(&sdp->sd_quota_inode->i_rwsem,
877 &gfs2_quota_imutex_key);
878
879 error = gfs2_rindex_update(sdp);
880 if (error)
881 goto fail_qinode;
882
883 return 0;
884
885 fail_qinode:
886 iput(sdp->sd_quota_inode);
887 fail_rindex:
888 gfs2_clear_rgrpd(sdp);
889 iput(sdp->sd_rindex);
890 fail_journal:
891 init_journal(sdp, UNDO);
892 fail:
893 return error;
894 }
895
init_per_node(struct gfs2_sbd * sdp,int undo)896 static int init_per_node(struct gfs2_sbd *sdp, int undo)
897 {
898 struct inode *pn = NULL;
899 char buf[30];
900 int error = 0;
901 struct gfs2_inode *ip;
902 struct inode *master = d_inode(sdp->sd_master_dir);
903
904 if (sdp->sd_args.ar_spectator)
905 return 0;
906
907 if (undo)
908 goto fail_qc_gh;
909
910 pn = gfs2_lookup_meta(master, "per_node");
911 if (IS_ERR(pn)) {
912 error = PTR_ERR(pn);
913 fs_err(sdp, "can't find per_node directory: %d\n", error);
914 return error;
915 }
916
917 sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
918 sdp->sd_qc_inode = gfs2_lookup_meta(pn, buf);
919 if (IS_ERR(sdp->sd_qc_inode)) {
920 error = PTR_ERR(sdp->sd_qc_inode);
921 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
922 goto fail_ut_i;
923 }
924
925 iput(pn);
926 pn = NULL;
927
928 ip = GFS2_I(sdp->sd_qc_inode);
929 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_NOPID,
930 &sdp->sd_qc_gh);
931 if (error) {
932 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
933 goto fail_qc_i;
934 }
935
936 return 0;
937
938 fail_qc_gh:
939 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
940 fail_qc_i:
941 iput(sdp->sd_qc_inode);
942 fail_ut_i:
943 iput(pn);
944 return error;
945 }
946
947 static const match_table_t nolock_tokens = {
948 { Opt_jid, "jid=%d", },
949 { Opt_err, NULL },
950 };
951
952 static const struct lm_lockops nolock_ops = {
953 .lm_proto_name = "lock_nolock",
954 .lm_put_lock = gfs2_glock_free,
955 .lm_tokens = &nolock_tokens,
956 };
957
958 /**
959 * gfs2_lm_mount - mount a locking protocol
960 * @sdp: the filesystem
961 * @silent: if 1, don't complain if the FS isn't a GFS2 fs
962 *
963 * Returns: errno
964 */
965
gfs2_lm_mount(struct gfs2_sbd * sdp,int silent)966 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
967 {
968 const struct lm_lockops *lm;
969 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
970 struct gfs2_args *args = &sdp->sd_args;
971 const char *proto = sdp->sd_proto_name;
972 const char *table = sdp->sd_table_name;
973 char *o, *options;
974 int ret;
975
976 if (!strcmp("lock_nolock", proto)) {
977 lm = &nolock_ops;
978 sdp->sd_args.ar_localflocks = 1;
979 #ifdef CONFIG_GFS2_FS_LOCKING_DLM
980 } else if (!strcmp("lock_dlm", proto)) {
981 lm = &gfs2_dlm_ops;
982 #endif
983 } else {
984 pr_info("can't find protocol %s\n", proto);
985 return -ENOENT;
986 }
987
988 fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);
989
990 ls->ls_ops = lm;
991 ls->ls_first = 1;
992
993 for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) {
994 substring_t tmp[MAX_OPT_ARGS];
995 int token, option;
996
997 if (!o || !*o)
998 continue;
999
1000 token = match_token(o, *lm->lm_tokens, tmp);
1001 switch (token) {
1002 case Opt_jid:
1003 ret = match_int(&tmp[0], &option);
1004 if (ret || option < 0)
1005 goto hostdata_error;
1006 if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags))
1007 ls->ls_jid = option;
1008 break;
1009 case Opt_id:
1010 case Opt_nodir:
1011 /* Obsolete, but left for backward compat purposes */
1012 break;
1013 case Opt_first:
1014 ret = match_int(&tmp[0], &option);
1015 if (ret || (option != 0 && option != 1))
1016 goto hostdata_error;
1017 ls->ls_first = option;
1018 break;
1019 case Opt_err:
1020 default:
1021 hostdata_error:
1022 fs_info(sdp, "unknown hostdata (%s)\n", o);
1023 return -EINVAL;
1024 }
1025 }
1026
1027 if (lm->lm_mount == NULL) {
1028 fs_info(sdp, "Now mounting FS (format %u)...\n", sdp->sd_sb.sb_fs_format);
1029 complete_all(&sdp->sd_locking_init);
1030 return 0;
1031 }
1032 ret = lm->lm_mount(sdp, table);
1033 if (ret == 0)
1034 fs_info(sdp, "Joined cluster. Now mounting FS (format %u)...\n",
1035 sdp->sd_sb.sb_fs_format);
1036 complete_all(&sdp->sd_locking_init);
1037 return ret;
1038 }
1039
gfs2_lm_unmount(struct gfs2_sbd * sdp)1040 void gfs2_lm_unmount(struct gfs2_sbd *sdp)
1041 {
1042 const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops;
1043 if (!gfs2_withdrawing_or_withdrawn(sdp) && lm->lm_unmount)
1044 lm->lm_unmount(sdp);
1045 }
1046
wait_on_journal(struct gfs2_sbd * sdp)1047 static int wait_on_journal(struct gfs2_sbd *sdp)
1048 {
1049 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
1050 return 0;
1051
1052 return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, TASK_INTERRUPTIBLE)
1053 ? -EINTR : 0;
1054 }
1055
gfs2_online_uevent(struct gfs2_sbd * sdp)1056 void gfs2_online_uevent(struct gfs2_sbd *sdp)
1057 {
1058 struct super_block *sb = sdp->sd_vfs;
1059 char ro[20];
1060 char spectator[20];
1061 char *envp[] = { ro, spectator, NULL };
1062 sprintf(ro, "RDONLY=%d", sb_rdonly(sb));
1063 sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
1064 kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp);
1065 }
1066
init_threads(struct gfs2_sbd * sdp)1067 static int init_threads(struct gfs2_sbd *sdp)
1068 {
1069 struct task_struct *p;
1070 int error = 0;
1071
1072 p = kthread_create(gfs2_logd, sdp, "gfs2_logd/%s", sdp->sd_fsname);
1073 if (IS_ERR(p)) {
1074 error = PTR_ERR(p);
1075 fs_err(sdp, "can't create logd thread: %d\n", error);
1076 return error;
1077 }
1078 get_task_struct(p);
1079 sdp->sd_logd_process = p;
1080
1081 p = kthread_create(gfs2_quotad, sdp, "gfs2_quotad/%s", sdp->sd_fsname);
1082 if (IS_ERR(p)) {
1083 error = PTR_ERR(p);
1084 fs_err(sdp, "can't create quotad thread: %d\n", error);
1085 goto fail;
1086 }
1087 get_task_struct(p);
1088 sdp->sd_quotad_process = p;
1089
1090 wake_up_process(sdp->sd_logd_process);
1091 wake_up_process(sdp->sd_quotad_process);
1092 return 0;
1093
1094 fail:
1095 kthread_stop_put(sdp->sd_logd_process);
1096 sdp->sd_logd_process = NULL;
1097 return error;
1098 }
1099
gfs2_destroy_threads(struct gfs2_sbd * sdp)1100 void gfs2_destroy_threads(struct gfs2_sbd *sdp)
1101 {
1102 if (sdp->sd_logd_process) {
1103 kthread_stop_put(sdp->sd_logd_process);
1104 sdp->sd_logd_process = NULL;
1105 }
1106 if (sdp->sd_quotad_process) {
1107 kthread_stop_put(sdp->sd_quotad_process);
1108 sdp->sd_quotad_process = NULL;
1109 }
1110 }
1111
1112 /**
1113 * gfs2_fill_super - Read in superblock
1114 * @sb: The VFS superblock
1115 * @fc: Mount options and flags
1116 *
1117 * Returns: -errno
1118 */
gfs2_fill_super(struct super_block * sb,struct fs_context * fc)1119 static int gfs2_fill_super(struct super_block *sb, struct fs_context *fc)
1120 {
1121 struct gfs2_args *args = fc->fs_private;
1122 int silent = fc->sb_flags & SB_SILENT;
1123 struct gfs2_sbd *sdp;
1124 struct gfs2_holder mount_gh;
1125 struct address_space *mapping;
1126 int error;
1127
1128 sdp = init_sbd(sb);
1129 if (!sdp) {
1130 pr_warn("can't alloc struct gfs2_sbd\n");
1131 return -ENOMEM;
1132 }
1133 sdp->sd_args = *args;
1134
1135 if (sdp->sd_args.ar_spectator) {
1136 sb->s_flags |= SB_RDONLY;
1137 set_bit(SDF_RORECOVERY, &sdp->sd_flags);
1138 }
1139 if (sdp->sd_args.ar_posix_acl)
1140 sb->s_flags |= SB_POSIXACL;
1141 if (sdp->sd_args.ar_nobarrier)
1142 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1143
1144 sb->s_flags |= SB_NOSEC;
1145 sb->s_magic = GFS2_MAGIC;
1146 sb->s_op = &gfs2_super_ops;
1147
1148 set_default_d_op(sb, &gfs2_dops);
1149 sb->s_export_op = &gfs2_export_ops;
1150 sb->s_qcop = &gfs2_quotactl_ops;
1151 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1152 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
1153 sb->s_time_gran = 1;
1154 sb->s_maxbytes = MAX_LFS_FILESIZE;
1155
1156 /* Set up the buffer cache and fill in some fake block size values
1157 to allow us to read-in the on-disk superblock. */
1158 sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, SECTOR_SIZE);
1159 error = -EINVAL;
1160 if (!sdp->sd_sb.sb_bsize)
1161 goto fail_free;
1162 sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
1163 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift - SECTOR_SHIFT;
1164 sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift);
1165
1166 sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit;
1167 sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum;
1168 if (sdp->sd_args.ar_statfs_quantum) {
1169 sdp->sd_tune.gt_statfs_slow = 0;
1170 sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum;
1171 } else {
1172 sdp->sd_tune.gt_statfs_slow = 1;
1173 sdp->sd_tune.gt_statfs_quantum = 30;
1174 }
1175
1176 /* Set up an address space for metadata writes */
1177 sdp->sd_inode = new_inode(sb);
1178 error = -ENOMEM;
1179 if (!sdp->sd_inode)
1180 goto fail_free;
1181 sdp->sd_inode->i_ino = GFS2_BAD_INO;
1182 sdp->sd_inode->i_size = OFFSET_MAX;
1183
1184 mapping = gfs2_aspace(sdp);
1185 mapping->a_ops = &gfs2_rgrp_aops;
1186 mapping_set_gfp_mask(mapping, GFP_NOFS);
1187
1188 error = init_names(sdp, silent);
1189 if (error)
1190 goto fail_iput;
1191
1192 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s", sdp->sd_table_name);
1193
1194 error = -ENOMEM;
1195 sdp->sd_glock_wq = alloc_workqueue("gfs2-glock/%s",
1196 WQ_MEM_RECLAIM | WQ_HIGHPRI | WQ_FREEZABLE | WQ_PERCPU,
1197 0,
1198 sdp->sd_fsname);
1199 if (!sdp->sd_glock_wq)
1200 goto fail_iput;
1201
1202 sdp->sd_delete_wq = alloc_workqueue("gfs2-delete/%s",
1203 WQ_MEM_RECLAIM | WQ_FREEZABLE | WQ_PERCPU, 0,
1204 sdp->sd_fsname);
1205 if (!sdp->sd_delete_wq)
1206 goto fail_glock_wq;
1207
1208 error = gfs2_sys_fs_add(sdp);
1209 if (error)
1210 goto fail_delete_wq;
1211
1212 gfs2_create_debugfs_file(sdp);
1213
1214 error = gfs2_lm_mount(sdp, silent);
1215 if (error)
1216 goto fail_debug;
1217
1218 error = init_locking(sdp, &mount_gh, DO);
1219 if (error)
1220 goto fail_lm;
1221
1222 error = init_sb(sdp, silent);
1223 if (error)
1224 goto fail_locking;
1225
1226 /* Turn rgrplvb on by default if fs format is recent enough */
1227 if (!sdp->sd_args.ar_got_rgrplvb && sdp->sd_sb.sb_fs_format > 1801)
1228 sdp->sd_args.ar_rgrplvb = 1;
1229
1230 error = wait_on_journal(sdp);
1231 if (error)
1232 goto fail_sb;
1233
1234 /*
1235 * If user space has failed to join the cluster or some similar
1236 * failure has occurred, then the journal id will contain a
1237 * negative (error) number. This will then be returned to the
1238 * caller (of the mount syscall). We do this even for spectator
1239 * mounts (which just write a jid of 0 to indicate "ok" even though
1240 * the jid is unused in the spectator case)
1241 */
1242 if (sdp->sd_lockstruct.ls_jid < 0) {
1243 error = sdp->sd_lockstruct.ls_jid;
1244 sdp->sd_lockstruct.ls_jid = 0;
1245 goto fail_sb;
1246 }
1247
1248 if (sdp->sd_args.ar_spectator)
1249 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.s",
1250 sdp->sd_table_name);
1251 else
1252 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.%u",
1253 sdp->sd_table_name, sdp->sd_lockstruct.ls_jid);
1254
1255 error = init_inodes(sdp, DO);
1256 if (error)
1257 goto fail_sb;
1258
1259 error = init_per_node(sdp, DO);
1260 if (error)
1261 goto fail_inodes;
1262
1263 error = gfs2_statfs_init(sdp);
1264 if (error) {
1265 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
1266 goto fail_per_node;
1267 }
1268
1269 if (!sb_rdonly(sb)) {
1270 error = init_threads(sdp);
1271 if (error)
1272 goto fail_per_node;
1273 }
1274
1275 error = gfs2_freeze_lock_shared(sdp);
1276 if (error)
1277 goto fail_per_node;
1278
1279 if (!sb_rdonly(sb))
1280 error = gfs2_make_fs_rw(sdp);
1281
1282 if (error) {
1283 gfs2_freeze_unlock(sdp);
1284 gfs2_destroy_threads(sdp);
1285 fs_err(sdp, "can't make FS RW: %d\n", error);
1286 goto fail_per_node;
1287 }
1288 gfs2_glock_dq_uninit(&mount_gh);
1289 gfs2_online_uevent(sdp);
1290 return 0;
1291
1292 fail_per_node:
1293 init_per_node(sdp, UNDO);
1294 fail_inodes:
1295 init_inodes(sdp, UNDO);
1296 fail_sb:
1297 if (sdp->sd_root_dir)
1298 dput(sdp->sd_root_dir);
1299 if (sdp->sd_master_dir)
1300 dput(sdp->sd_master_dir);
1301 if (sb->s_root)
1302 dput(sb->s_root);
1303 sb->s_root = NULL;
1304 fail_locking:
1305 init_locking(sdp, &mount_gh, UNDO);
1306 fail_lm:
1307 complete_all(&sdp->sd_journal_ready);
1308 gfs2_gl_hash_clear(sdp);
1309 gfs2_lm_unmount(sdp);
1310 fail_debug:
1311 gfs2_delete_debugfs_file(sdp);
1312 gfs2_sys_fs_del(sdp);
1313 fail_delete_wq:
1314 destroy_workqueue(sdp->sd_delete_wq);
1315 fail_glock_wq:
1316 if (sdp->sd_glock_wq)
1317 destroy_workqueue(sdp->sd_glock_wq);
1318 fail_iput:
1319 iput(sdp->sd_inode);
1320 fail_free:
1321 free_sbd(sdp);
1322 return error;
1323 }
1324
1325 /**
1326 * gfs2_get_tree - Get the GFS2 superblock and root directory
1327 * @fc: The filesystem context
1328 *
1329 * Returns: 0 or -errno on error
1330 */
gfs2_get_tree(struct fs_context * fc)1331 static int gfs2_get_tree(struct fs_context *fc)
1332 {
1333 struct gfs2_args *args = fc->fs_private;
1334 struct gfs2_sbd *sdp;
1335 int error;
1336
1337 error = get_tree_bdev(fc, gfs2_fill_super);
1338 if (error)
1339 return error;
1340
1341 sdp = fc->root->d_sb->s_fs_info;
1342 dput(fc->root);
1343 if (args->ar_meta)
1344 fc->root = dget(sdp->sd_master_dir);
1345 else
1346 fc->root = dget(sdp->sd_root_dir);
1347 return 0;
1348 }
1349
gfs2_fc_free(struct fs_context * fc)1350 static void gfs2_fc_free(struct fs_context *fc)
1351 {
1352 struct gfs2_args *args = fc->fs_private;
1353
1354 kfree(args);
1355 }
1356
1357 enum gfs2_param {
1358 Opt_lockproto,
1359 Opt_locktable,
1360 Opt_hostdata,
1361 Opt_spectator,
1362 Opt_ignore_local_fs,
1363 Opt_localflocks,
1364 Opt_localcaching,
1365 Opt_debug,
1366 Opt_upgrade,
1367 Opt_acl,
1368 Opt_quota,
1369 Opt_quota_flag,
1370 Opt_suiddir,
1371 Opt_data,
1372 Opt_meta,
1373 Opt_discard,
1374 Opt_commit,
1375 Opt_errors,
1376 Opt_statfs_quantum,
1377 Opt_statfs_percent,
1378 Opt_quota_quantum,
1379 Opt_barrier,
1380 Opt_rgrplvb,
1381 Opt_loccookie,
1382 };
1383
1384 static const struct constant_table gfs2_param_quota[] = {
1385 {"off", GFS2_QUOTA_OFF},
1386 {"account", GFS2_QUOTA_ACCOUNT},
1387 {"on", GFS2_QUOTA_ON},
1388 {"quiet", GFS2_QUOTA_QUIET},
1389 {}
1390 };
1391
1392 enum opt_data {
1393 Opt_data_writeback = GFS2_DATA_WRITEBACK,
1394 Opt_data_ordered = GFS2_DATA_ORDERED,
1395 };
1396
1397 static const struct constant_table gfs2_param_data[] = {
1398 {"writeback", Opt_data_writeback },
1399 {"ordered", Opt_data_ordered },
1400 {}
1401 };
1402
1403 enum opt_errors {
1404 Opt_errors_withdraw = GFS2_ERRORS_WITHDRAW,
1405 Opt_errors_panic = GFS2_ERRORS_PANIC,
1406 };
1407
1408 static const struct constant_table gfs2_param_errors[] = {
1409 {"withdraw", Opt_errors_withdraw },
1410 {"panic", Opt_errors_panic },
1411 {}
1412 };
1413
1414 static const struct fs_parameter_spec gfs2_fs_parameters[] = {
1415 fsparam_string ("lockproto", Opt_lockproto),
1416 fsparam_string ("locktable", Opt_locktable),
1417 fsparam_string ("hostdata", Opt_hostdata),
1418 fsparam_flag ("spectator", Opt_spectator),
1419 fsparam_flag ("norecovery", Opt_spectator),
1420 fsparam_flag ("ignore_local_fs", Opt_ignore_local_fs),
1421 fsparam_flag ("localflocks", Opt_localflocks),
1422 fsparam_flag ("localcaching", Opt_localcaching),
1423 fsparam_flag_no("debug", Opt_debug),
1424 fsparam_flag ("upgrade", Opt_upgrade),
1425 fsparam_flag_no("acl", Opt_acl),
1426 fsparam_flag_no("suiddir", Opt_suiddir),
1427 fsparam_enum ("data", Opt_data, gfs2_param_data),
1428 fsparam_flag ("meta", Opt_meta),
1429 fsparam_flag_no("discard", Opt_discard),
1430 fsparam_s32 ("commit", Opt_commit),
1431 fsparam_enum ("errors", Opt_errors, gfs2_param_errors),
1432 fsparam_s32 ("statfs_quantum", Opt_statfs_quantum),
1433 fsparam_s32 ("statfs_percent", Opt_statfs_percent),
1434 fsparam_s32 ("quota_quantum", Opt_quota_quantum),
1435 fsparam_flag_no("barrier", Opt_barrier),
1436 fsparam_flag_no("rgrplvb", Opt_rgrplvb),
1437 fsparam_flag_no("loccookie", Opt_loccookie),
1438 /* quota can be a flag or an enum so it gets special treatment */
1439 fsparam_flag_no("quota", Opt_quota_flag),
1440 fsparam_enum("quota", Opt_quota, gfs2_param_quota),
1441 {}
1442 };
1443
1444 /* Parse a single mount parameter */
gfs2_parse_param(struct fs_context * fc,struct fs_parameter * param)1445 static int gfs2_parse_param(struct fs_context *fc, struct fs_parameter *param)
1446 {
1447 struct gfs2_args *args = fc->fs_private;
1448 struct fs_parse_result result;
1449 int o;
1450
1451 o = fs_parse(fc, gfs2_fs_parameters, param, &result);
1452 if (o < 0)
1453 return o;
1454
1455 switch (o) {
1456 case Opt_lockproto:
1457 strscpy(args->ar_lockproto, param->string, GFS2_LOCKNAME_LEN);
1458 break;
1459 case Opt_locktable:
1460 strscpy(args->ar_locktable, param->string, GFS2_LOCKNAME_LEN);
1461 break;
1462 case Opt_hostdata:
1463 strscpy(args->ar_hostdata, param->string, GFS2_LOCKNAME_LEN);
1464 break;
1465 case Opt_spectator:
1466 args->ar_spectator = 1;
1467 break;
1468 case Opt_ignore_local_fs:
1469 /* Retained for backwards compat only */
1470 break;
1471 case Opt_localflocks:
1472 args->ar_localflocks = 1;
1473 break;
1474 case Opt_localcaching:
1475 /* Retained for backwards compat only */
1476 break;
1477 case Opt_debug:
1478 if (result.boolean && args->ar_errors == GFS2_ERRORS_PANIC)
1479 return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive");
1480 args->ar_debug = result.boolean;
1481 break;
1482 case Opt_upgrade:
1483 /* Retained for backwards compat only */
1484 break;
1485 case Opt_acl:
1486 args->ar_posix_acl = result.boolean;
1487 break;
1488 case Opt_quota_flag:
1489 args->ar_quota = result.negated ? GFS2_QUOTA_OFF : GFS2_QUOTA_ON;
1490 break;
1491 case Opt_quota:
1492 args->ar_quota = result.int_32;
1493 break;
1494 case Opt_suiddir:
1495 args->ar_suiddir = result.boolean;
1496 break;
1497 case Opt_data:
1498 /* The uint_32 result maps directly to GFS2_DATA_* */
1499 args->ar_data = result.uint_32;
1500 break;
1501 case Opt_meta:
1502 args->ar_meta = 1;
1503 break;
1504 case Opt_discard:
1505 args->ar_discard = result.boolean;
1506 break;
1507 case Opt_commit:
1508 if (result.int_32 <= 0)
1509 return invalfc(fc, "commit mount option requires a positive numeric argument");
1510 args->ar_commit = result.int_32;
1511 break;
1512 case Opt_statfs_quantum:
1513 if (result.int_32 < 0)
1514 return invalfc(fc, "statfs_quantum mount option requires a non-negative numeric argument");
1515 args->ar_statfs_quantum = result.int_32;
1516 break;
1517 case Opt_quota_quantum:
1518 if (result.int_32 <= 0)
1519 return invalfc(fc, "quota_quantum mount option requires a positive numeric argument");
1520 args->ar_quota_quantum = result.int_32;
1521 break;
1522 case Opt_statfs_percent:
1523 if (result.int_32 < 0 || result.int_32 > 100)
1524 return invalfc(fc, "statfs_percent mount option requires a numeric argument between 0 and 100");
1525 args->ar_statfs_percent = result.int_32;
1526 break;
1527 case Opt_errors:
1528 if (args->ar_debug && result.uint_32 == GFS2_ERRORS_PANIC)
1529 return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive");
1530 args->ar_errors = result.uint_32;
1531 break;
1532 case Opt_barrier:
1533 args->ar_nobarrier = result.boolean;
1534 break;
1535 case Opt_rgrplvb:
1536 args->ar_rgrplvb = result.boolean;
1537 args->ar_got_rgrplvb = 1;
1538 break;
1539 case Opt_loccookie:
1540 args->ar_loccookie = result.boolean;
1541 break;
1542 default:
1543 return invalfc(fc, "invalid mount option: %s", param->key);
1544 }
1545 return 0;
1546 }
1547
gfs2_reconfigure(struct fs_context * fc)1548 static int gfs2_reconfigure(struct fs_context *fc)
1549 {
1550 struct super_block *sb = fc->root->d_sb;
1551 struct gfs2_sbd *sdp = sb->s_fs_info;
1552 struct gfs2_args *oldargs = &sdp->sd_args;
1553 struct gfs2_args *newargs = fc->fs_private;
1554 struct gfs2_tune *gt = &sdp->sd_tune;
1555 int error = 0;
1556
1557 sync_filesystem(sb);
1558
1559 spin_lock(>->gt_spin);
1560 oldargs->ar_commit = gt->gt_logd_secs;
1561 oldargs->ar_quota_quantum = gt->gt_quota_quantum;
1562 if (gt->gt_statfs_slow)
1563 oldargs->ar_statfs_quantum = 0;
1564 else
1565 oldargs->ar_statfs_quantum = gt->gt_statfs_quantum;
1566 spin_unlock(>->gt_spin);
1567
1568 if (strcmp(newargs->ar_lockproto, oldargs->ar_lockproto)) {
1569 errorfc(fc, "reconfiguration of locking protocol not allowed");
1570 return -EINVAL;
1571 }
1572 if (strcmp(newargs->ar_locktable, oldargs->ar_locktable)) {
1573 errorfc(fc, "reconfiguration of lock table not allowed");
1574 return -EINVAL;
1575 }
1576 if (strcmp(newargs->ar_hostdata, oldargs->ar_hostdata)) {
1577 errorfc(fc, "reconfiguration of host data not allowed");
1578 return -EINVAL;
1579 }
1580 if (newargs->ar_spectator != oldargs->ar_spectator) {
1581 errorfc(fc, "reconfiguration of spectator mode not allowed");
1582 return -EINVAL;
1583 }
1584 if (newargs->ar_localflocks != oldargs->ar_localflocks) {
1585 errorfc(fc, "reconfiguration of localflocks not allowed");
1586 return -EINVAL;
1587 }
1588 if (newargs->ar_meta != oldargs->ar_meta) {
1589 errorfc(fc, "switching between gfs2 and gfs2meta not allowed");
1590 return -EINVAL;
1591 }
1592 if (oldargs->ar_spectator)
1593 fc->sb_flags |= SB_RDONLY;
1594
1595 if ((sb->s_flags ^ fc->sb_flags) & SB_RDONLY) {
1596 if (fc->sb_flags & SB_RDONLY) {
1597 gfs2_make_fs_ro(sdp);
1598 } else {
1599 error = gfs2_make_fs_rw(sdp);
1600 if (error)
1601 errorfc(fc, "unable to remount read-write");
1602 }
1603 }
1604 sdp->sd_args = *newargs;
1605
1606 if (sdp->sd_args.ar_posix_acl)
1607 sb->s_flags |= SB_POSIXACL;
1608 else
1609 sb->s_flags &= ~SB_POSIXACL;
1610 if (sdp->sd_args.ar_nobarrier)
1611 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1612 else
1613 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1614 spin_lock(>->gt_spin);
1615 gt->gt_logd_secs = newargs->ar_commit;
1616 gt->gt_quota_quantum = newargs->ar_quota_quantum;
1617 if (newargs->ar_statfs_quantum) {
1618 gt->gt_statfs_slow = 0;
1619 gt->gt_statfs_quantum = newargs->ar_statfs_quantum;
1620 }
1621 else {
1622 gt->gt_statfs_slow = 1;
1623 gt->gt_statfs_quantum = 30;
1624 }
1625 spin_unlock(>->gt_spin);
1626
1627 gfs2_online_uevent(sdp);
1628 return error;
1629 }
1630
1631 static const struct fs_context_operations gfs2_context_ops = {
1632 .free = gfs2_fc_free,
1633 .parse_param = gfs2_parse_param,
1634 .get_tree = gfs2_get_tree,
1635 .reconfigure = gfs2_reconfigure,
1636 };
1637
1638 /* Set up the filesystem mount context */
gfs2_init_fs_context(struct fs_context * fc)1639 static int gfs2_init_fs_context(struct fs_context *fc)
1640 {
1641 struct gfs2_args *args;
1642
1643 args = kmalloc(sizeof(*args), GFP_KERNEL);
1644 if (args == NULL)
1645 return -ENOMEM;
1646
1647 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
1648 struct gfs2_sbd *sdp = fc->root->d_sb->s_fs_info;
1649
1650 *args = sdp->sd_args;
1651 } else {
1652 memset(args, 0, sizeof(*args));
1653 args->ar_quota = GFS2_QUOTA_DEFAULT;
1654 args->ar_data = GFS2_DATA_DEFAULT;
1655 args->ar_commit = 30;
1656 args->ar_statfs_quantum = 30;
1657 args->ar_quota_quantum = 60;
1658 args->ar_errors = GFS2_ERRORS_DEFAULT;
1659 }
1660 fc->fs_private = args;
1661 fc->ops = &gfs2_context_ops;
1662 return 0;
1663 }
1664
set_meta_super(struct super_block * s,struct fs_context * fc)1665 static int set_meta_super(struct super_block *s, struct fs_context *fc)
1666 {
1667 return -EINVAL;
1668 }
1669
test_meta_super(struct super_block * s,struct fs_context * fc)1670 static int test_meta_super(struct super_block *s, struct fs_context *fc)
1671 {
1672 return (fc->sget_key == s->s_bdev);
1673 }
1674
gfs2_meta_get_tree(struct fs_context * fc)1675 static int gfs2_meta_get_tree(struct fs_context *fc)
1676 {
1677 struct super_block *s;
1678 struct gfs2_sbd *sdp;
1679 struct path path;
1680 int error;
1681
1682 if (!fc->source || !*fc->source)
1683 return -EINVAL;
1684
1685 error = kern_path(fc->source, LOOKUP_FOLLOW, &path);
1686 if (error) {
1687 pr_warn("path_lookup on %s returned error %d\n",
1688 fc->source, error);
1689 return error;
1690 }
1691 fc->fs_type = &gfs2_fs_type;
1692 fc->sget_key = path.dentry->d_sb->s_bdev;
1693 s = sget_fc(fc, test_meta_super, set_meta_super);
1694 path_put(&path);
1695 if (IS_ERR(s)) {
1696 pr_warn("gfs2 mount does not exist\n");
1697 return PTR_ERR(s);
1698 }
1699 if ((fc->sb_flags ^ s->s_flags) & SB_RDONLY) {
1700 deactivate_locked_super(s);
1701 return -EBUSY;
1702 }
1703 sdp = s->s_fs_info;
1704 fc->root = dget(sdp->sd_master_dir);
1705 return 0;
1706 }
1707
1708 static const struct fs_context_operations gfs2_meta_context_ops = {
1709 .free = gfs2_fc_free,
1710 .get_tree = gfs2_meta_get_tree,
1711 };
1712
gfs2_meta_init_fs_context(struct fs_context * fc)1713 static int gfs2_meta_init_fs_context(struct fs_context *fc)
1714 {
1715 int ret = gfs2_init_fs_context(fc);
1716
1717 if (ret)
1718 return ret;
1719
1720 fc->ops = &gfs2_meta_context_ops;
1721 return 0;
1722 }
1723
1724 /**
1725 * gfs2_evict_inodes - evict inodes cooperatively
1726 * @sb: the superblock
1727 *
1728 * When evicting an inode with a zero link count, we are trying to upgrade the
1729 * inode's iopen glock from SH to EX mode in order to determine if we can
1730 * delete the inode. The other nodes are supposed to evict the inode from
1731 * their caches if they can, and to poke the inode's inode glock if they cannot
1732 * do so. Either behavior allows gfs2_upgrade_iopen_glock() to proceed
1733 * quickly, but if the other nodes are not cooperating, the lock upgrading
1734 * attempt will time out. Since inodes are evicted sequentially, this can add
1735 * up quickly.
1736 *
1737 * Function evict_inodes() tries to keep the s_inode_list_lock list locked over
1738 * a long time, which prevents other inodes from being evicted concurrently.
1739 * This precludes the cooperative behavior we are looking for. This special
1740 * version of evict_inodes() avoids that.
1741 *
1742 * Modeled after drop_pagecache_sb().
1743 */
gfs2_evict_inodes(struct super_block * sb)1744 static void gfs2_evict_inodes(struct super_block *sb)
1745 {
1746 struct inode *inode, *toput_inode = NULL;
1747 struct gfs2_sbd *sdp = sb->s_fs_info;
1748
1749 set_bit(SDF_EVICTING, &sdp->sd_flags);
1750
1751 spin_lock(&sb->s_inode_list_lock);
1752 list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
1753 spin_lock(&inode->i_lock);
1754 if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) &&
1755 !need_resched()) {
1756 spin_unlock(&inode->i_lock);
1757 continue;
1758 }
1759 __iget(inode);
1760 spin_unlock(&inode->i_lock);
1761 spin_unlock(&sb->s_inode_list_lock);
1762
1763 iput(toput_inode);
1764 toput_inode = inode;
1765
1766 cond_resched();
1767 spin_lock(&sb->s_inode_list_lock);
1768 }
1769 spin_unlock(&sb->s_inode_list_lock);
1770 iput(toput_inode);
1771 }
1772
gfs2_kill_sb(struct super_block * sb)1773 static void gfs2_kill_sb(struct super_block *sb)
1774 {
1775 struct gfs2_sbd *sdp = sb->s_fs_info;
1776
1777 if (sdp == NULL) {
1778 kill_block_super(sb);
1779 return;
1780 }
1781
1782 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SYNC | GFS2_LFC_KILL_SB);
1783 dput(sdp->sd_root_dir);
1784 dput(sdp->sd_master_dir);
1785 sdp->sd_root_dir = NULL;
1786 sdp->sd_master_dir = NULL;
1787 shrink_dcache_sb(sb);
1788
1789 gfs2_evict_inodes(sb);
1790
1791 /*
1792 * Flush and then drain the delete workqueue here (via
1793 * destroy_workqueue()) to ensure that any delete work that
1794 * may be running will also see the SDF_KILL flag.
1795 */
1796 set_bit(SDF_KILL, &sdp->sd_flags);
1797 gfs2_flush_delete_work(sdp);
1798 destroy_workqueue(sdp->sd_delete_wq);
1799
1800 kill_block_super(sb);
1801 }
1802
1803 struct file_system_type gfs2_fs_type = {
1804 .name = "gfs2",
1805 .fs_flags = FS_REQUIRES_DEV,
1806 .init_fs_context = gfs2_init_fs_context,
1807 .parameters = gfs2_fs_parameters,
1808 .kill_sb = gfs2_kill_sb,
1809 .owner = THIS_MODULE,
1810 };
1811 MODULE_ALIAS_FS("gfs2");
1812
1813 struct file_system_type gfs2meta_fs_type = {
1814 .name = "gfs2meta",
1815 .fs_flags = FS_REQUIRES_DEV,
1816 .init_fs_context = gfs2_meta_init_fs_context,
1817 .owner = THIS_MODULE,
1818 };
1819 MODULE_ALIAS_FS("gfs2meta");
1820