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 if (sdp->sd_lkstats)
70 free_percpu(sdp->sd_lkstats);
71 sb->s_fs_info = NULL;
72 kfree(sdp);
73 }
74
init_sbd(struct super_block * sb)75 static struct gfs2_sbd *init_sbd(struct super_block *sb)
76 {
77 struct gfs2_sbd *sdp;
78
79 sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL);
80 if (!sdp)
81 return NULL;
82
83 sdp->sd_vfs = sb;
84 sdp->sd_lkstats = alloc_percpu(struct gfs2_pcpu_lkstats);
85 if (!sdp->sd_lkstats)
86 goto fail;
87 sb->s_fs_info = sdp;
88
89 set_bit(SDF_NOJOURNALID, &sdp->sd_flags);
90 gfs2_tune_init(&sdp->sd_tune);
91
92 init_waitqueue_head(&sdp->sd_kill_wait);
93 init_waitqueue_head(&sdp->sd_async_glock_wait);
94 atomic_set(&sdp->sd_glock_disposal, 0);
95 init_completion(&sdp->sd_locking_init);
96 init_completion(&sdp->sd_wdack);
97 spin_lock_init(&sdp->sd_statfs_spin);
98
99 spin_lock_init(&sdp->sd_rindex_spin);
100 sdp->sd_rindex_tree.rb_node = NULL;
101
102 INIT_LIST_HEAD(&sdp->sd_jindex_list);
103 spin_lock_init(&sdp->sd_jindex_spin);
104 mutex_init(&sdp->sd_jindex_mutex);
105 init_completion(&sdp->sd_journal_ready);
106
107 INIT_LIST_HEAD(&sdp->sd_quota_list);
108 mutex_init(&sdp->sd_quota_sync_mutex);
109 init_waitqueue_head(&sdp->sd_quota_wait);
110 spin_lock_init(&sdp->sd_bitmap_lock);
111
112 INIT_LIST_HEAD(&sdp->sd_sc_inodes_list);
113
114 spin_lock_init(&sdp->sd_log_lock);
115 atomic_set(&sdp->sd_log_pinned, 0);
116 INIT_LIST_HEAD(&sdp->sd_log_revokes);
117 INIT_LIST_HEAD(&sdp->sd_log_ordered);
118 spin_lock_init(&sdp->sd_ordered_lock);
119
120 init_waitqueue_head(&sdp->sd_log_waitq);
121 init_waitqueue_head(&sdp->sd_logd_waitq);
122 spin_lock_init(&sdp->sd_ail_lock);
123 INIT_LIST_HEAD(&sdp->sd_ail1_list);
124 INIT_LIST_HEAD(&sdp->sd_ail2_list);
125
126 init_rwsem(&sdp->sd_log_flush_lock);
127 atomic_set(&sdp->sd_log_in_flight, 0);
128 init_waitqueue_head(&sdp->sd_log_flush_wait);
129 mutex_init(&sdp->sd_freeze_mutex);
130 INIT_LIST_HEAD(&sdp->sd_dead_glocks);
131
132 return sdp;
133
134 fail:
135 free_sbd(sdp);
136 return NULL;
137 }
138
139 /**
140 * gfs2_check_sb - Check superblock
141 * @sdp: the filesystem
142 * @silent: Don't print a message if the check fails
143 *
144 * Checks the version code of the FS is one that we understand how to
145 * read and that the sizes of the various on-disk structures have not
146 * changed.
147 */
148
gfs2_check_sb(struct gfs2_sbd * sdp,int silent)149 static int gfs2_check_sb(struct gfs2_sbd *sdp, int silent)
150 {
151 struct gfs2_sb_host *sb = &sdp->sd_sb;
152
153 if (sb->sb_magic != GFS2_MAGIC ||
154 sb->sb_type != GFS2_METATYPE_SB) {
155 if (!silent)
156 pr_warn("not a GFS2 filesystem\n");
157 return -EINVAL;
158 }
159
160 if (sb->sb_fs_format < GFS2_FS_FORMAT_MIN ||
161 sb->sb_fs_format > GFS2_FS_FORMAT_MAX ||
162 sb->sb_multihost_format != GFS2_FORMAT_MULTI) {
163 fs_warn(sdp, "Unknown on-disk format, unable to mount\n");
164 return -EINVAL;
165 }
166
167 if (sb->sb_bsize < 512 || sb->sb_bsize > PAGE_SIZE ||
168 (sb->sb_bsize & (sb->sb_bsize - 1))) {
169 pr_warn("Invalid block size\n");
170 return -EINVAL;
171 }
172 if (sb->sb_bsize_shift != ffs(sb->sb_bsize) - 1) {
173 pr_warn("Invalid block size shift\n");
174 return -EINVAL;
175 }
176 return 0;
177 }
178
gfs2_sb_in(struct gfs2_sbd * sdp,const struct gfs2_sb * str)179 static void gfs2_sb_in(struct gfs2_sbd *sdp, const struct gfs2_sb *str)
180 {
181 struct gfs2_sb_host *sb = &sdp->sd_sb;
182 struct super_block *s = sdp->sd_vfs;
183
184 sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic);
185 sb->sb_type = be32_to_cpu(str->sb_header.mh_type);
186 sb->sb_fs_format = be32_to_cpu(str->sb_fs_format);
187 sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format);
188 sb->sb_bsize = be32_to_cpu(str->sb_bsize);
189 sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift);
190 sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr);
191 sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino);
192 sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr);
193 sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino);
194
195 memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN);
196 memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN);
197 super_set_uuid(s, str->sb_uuid, 16);
198 }
199
200 /**
201 * gfs2_read_super - Read the gfs2 super block from disk
202 * @sdp: The GFS2 super block
203 * @sector: The location of the super block
204 * @silent: Don't print a message if the check fails
205 *
206 * This uses the bio functions to read the super block from disk
207 * because we want to be 100% sure that we never read cached data.
208 * A super block is read twice only during each GFS2 mount and is
209 * never written to by the filesystem. The first time its read no
210 * locks are held, and the only details which are looked at are those
211 * relating to the locking protocol. Once locking is up and working,
212 * the sb is read again under the lock to establish the location of
213 * the master directory (contains pointers to journals etc) and the
214 * root directory.
215 *
216 * Returns: 0 on success or error
217 */
218
gfs2_read_super(struct gfs2_sbd * sdp,sector_t sector,int silent)219 static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector, int silent)
220 {
221 struct super_block *sb = sdp->sd_vfs;
222 struct page *page;
223 struct bio_vec bvec;
224 struct bio bio;
225 int err;
226
227 page = alloc_page(GFP_KERNEL);
228 if (unlikely(!page))
229 return -ENOMEM;
230
231 bio_init(&bio, sb->s_bdev, &bvec, 1, REQ_OP_READ | REQ_META);
232 bio.bi_iter.bi_sector = sector * (sb->s_blocksize >> 9);
233 __bio_add_page(&bio, page, PAGE_SIZE, 0);
234
235 err = submit_bio_wait(&bio);
236 if (err) {
237 pr_warn("error %d reading superblock\n", err);
238 __free_page(page);
239 return err;
240 }
241 gfs2_sb_in(sdp, page_address(page));
242 __free_page(page);
243 return gfs2_check_sb(sdp, silent);
244 }
245
246 /**
247 * gfs2_read_sb - Read super block
248 * @sdp: The GFS2 superblock
249 * @silent: Don't print message if mount fails
250 *
251 */
252
gfs2_read_sb(struct gfs2_sbd * sdp,int silent)253 static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent)
254 {
255 u32 hash_blocks, ind_blocks, leaf_blocks;
256 u32 tmp_blocks;
257 unsigned int x;
258 int error;
259
260 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
261 if (error) {
262 if (!silent)
263 fs_err(sdp, "can't read superblock\n");
264 return error;
265 }
266
267 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift - 9;
268 sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift);
269 sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
270 sizeof(struct gfs2_dinode)) / sizeof(u64);
271 sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
272 sizeof(struct gfs2_meta_header)) / sizeof(u64);
273 sdp->sd_ldptrs = (sdp->sd_sb.sb_bsize -
274 sizeof(struct gfs2_log_descriptor)) / sizeof(u64);
275 sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
276 sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
277 sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
278 sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64);
279 sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
280 sizeof(struct gfs2_meta_header)) /
281 sizeof(struct gfs2_quota_change);
282 sdp->sd_blocks_per_bitmap = (sdp->sd_sb.sb_bsize -
283 sizeof(struct gfs2_meta_header))
284 * GFS2_NBBY; /* not the rgrp bitmap, subsequent bitmaps only */
285
286 /*
287 * We always keep at least one block reserved for revokes in
288 * transactions. This greatly simplifies allocating additional
289 * revoke blocks.
290 */
291 atomic_set(&sdp->sd_log_revokes_available, sdp->sd_ldptrs);
292
293 /* Compute maximum reservation required to add a entry to a directory */
294
295 hash_blocks = DIV_ROUND_UP(sizeof(u64) * BIT(GFS2_DIR_MAX_DEPTH),
296 sdp->sd_jbsize);
297
298 ind_blocks = 0;
299 for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
300 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
301 ind_blocks += tmp_blocks;
302 }
303
304 leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
305
306 sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
307
308 sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
309 sizeof(struct gfs2_dinode);
310 sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
311 for (x = 2;; x++) {
312 u64 space, d;
313 u32 m;
314
315 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
316 d = space;
317 m = do_div(d, sdp->sd_inptrs);
318
319 if (d != sdp->sd_heightsize[x - 1] || m)
320 break;
321 sdp->sd_heightsize[x] = space;
322 }
323 sdp->sd_max_height = x;
324 sdp->sd_heightsize[x] = ~0;
325 gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
326
327 sdp->sd_max_dents_per_leaf = (sdp->sd_sb.sb_bsize -
328 sizeof(struct gfs2_leaf)) /
329 GFS2_MIN_DIRENT_SIZE;
330 return 0;
331 }
332
init_names(struct gfs2_sbd * sdp,int silent)333 static int init_names(struct gfs2_sbd *sdp, int silent)
334 {
335 char *proto, *table;
336 int error = 0;
337
338 proto = sdp->sd_args.ar_lockproto;
339 table = sdp->sd_args.ar_locktable;
340
341 /* Try to autodetect */
342
343 if (!proto[0] || !table[0]) {
344 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
345 if (error)
346 return error;
347
348 if (!proto[0])
349 proto = sdp->sd_sb.sb_lockproto;
350 if (!table[0])
351 table = sdp->sd_sb.sb_locktable;
352 }
353
354 if (!table[0])
355 table = sdp->sd_vfs->s_id;
356
357 BUILD_BUG_ON(GFS2_LOCKNAME_LEN > GFS2_FSNAME_LEN);
358
359 strscpy(sdp->sd_proto_name, proto, GFS2_LOCKNAME_LEN);
360 strscpy(sdp->sd_table_name, table, GFS2_LOCKNAME_LEN);
361
362 table = sdp->sd_table_name;
363 while ((table = strchr(table, '/')))
364 *table = '_';
365
366 return error;
367 }
368
init_locking(struct gfs2_sbd * sdp,struct gfs2_holder * mount_gh,int undo)369 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
370 int undo)
371 {
372 int error = 0;
373
374 if (undo)
375 goto fail_trans;
376
377 error = gfs2_glock_nq_num(sdp,
378 GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
379 LM_ST_EXCLUSIVE,
380 LM_FLAG_NOEXP | GL_NOCACHE | GL_NOPID,
381 mount_gh);
382 if (error) {
383 fs_err(sdp, "can't acquire mount glock: %d\n", error);
384 goto fail;
385 }
386
387 error = gfs2_glock_nq_num(sdp,
388 GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
389 LM_ST_SHARED,
390 LM_FLAG_NOEXP | GL_EXACT | GL_NOPID,
391 &sdp->sd_live_gh);
392 if (error) {
393 fs_err(sdp, "can't acquire live glock: %d\n", error);
394 goto fail_mount;
395 }
396
397 error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
398 CREATE, &sdp->sd_rename_gl);
399 if (error) {
400 fs_err(sdp, "can't create rename glock: %d\n", error);
401 goto fail_live;
402 }
403
404 error = gfs2_glock_get(sdp, GFS2_FREEZE_LOCK, &gfs2_freeze_glops,
405 CREATE, &sdp->sd_freeze_gl);
406 if (error) {
407 fs_err(sdp, "can't create freeze glock: %d\n", error);
408 goto fail_rename;
409 }
410
411 return 0;
412
413 fail_trans:
414 gfs2_glock_put(sdp->sd_freeze_gl);
415 fail_rename:
416 gfs2_glock_put(sdp->sd_rename_gl);
417 fail_live:
418 gfs2_glock_dq_uninit(&sdp->sd_live_gh);
419 fail_mount:
420 gfs2_glock_dq_uninit(mount_gh);
421 fail:
422 return error;
423 }
424
gfs2_lookup_root(struct super_block * sb,struct dentry ** dptr,u64 no_addr,const char * name)425 static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr,
426 u64 no_addr, const char *name)
427 {
428 struct gfs2_sbd *sdp = sb->s_fs_info;
429 struct dentry *dentry;
430 struct inode *inode;
431
432 inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0,
433 GFS2_BLKST_FREE /* ignore */);
434 if (IS_ERR(inode)) {
435 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode));
436 return PTR_ERR(inode);
437 }
438 dentry = d_make_root(inode);
439 if (!dentry) {
440 fs_err(sdp, "can't alloc %s dentry\n", name);
441 return -ENOMEM;
442 }
443 *dptr = dentry;
444 return 0;
445 }
446
init_sb(struct gfs2_sbd * sdp,int silent)447 static int init_sb(struct gfs2_sbd *sdp, int silent)
448 {
449 struct super_block *sb = sdp->sd_vfs;
450 struct gfs2_holder sb_gh;
451 u64 no_addr;
452 int ret;
453
454 ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
455 LM_ST_SHARED, 0, &sb_gh);
456 if (ret) {
457 fs_err(sdp, "can't acquire superblock glock: %d\n", ret);
458 return ret;
459 }
460
461 ret = gfs2_read_sb(sdp, silent);
462 if (ret) {
463 fs_err(sdp, "can't read superblock: %d\n", ret);
464 goto out;
465 }
466
467 switch(sdp->sd_sb.sb_fs_format) {
468 case GFS2_FS_FORMAT_MAX:
469 sb->s_xattr = gfs2_xattr_handlers_max;
470 break;
471
472 case GFS2_FS_FORMAT_MIN:
473 sb->s_xattr = gfs2_xattr_handlers_min;
474 break;
475
476 default:
477 BUG();
478 }
479
480 /* Set up the buffer cache and SB for real */
481 if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) {
482 ret = -EINVAL;
483 fs_err(sdp, "FS block size (%u) is too small for device "
484 "block size (%u)\n",
485 sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev));
486 goto out;
487 }
488 if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
489 ret = -EINVAL;
490 fs_err(sdp, "FS block size (%u) is too big for machine "
491 "page size (%u)\n",
492 sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
493 goto out;
494 }
495 sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
496
497 /* Get the root inode */
498 no_addr = sdp->sd_sb.sb_root_dir.no_addr;
499 ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root");
500 if (ret)
501 goto out;
502
503 /* Get the master inode */
504 no_addr = sdp->sd_sb.sb_master_dir.no_addr;
505 ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master");
506 if (ret) {
507 dput(sdp->sd_root_dir);
508 goto out;
509 }
510 sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir);
511 out:
512 gfs2_glock_dq_uninit(&sb_gh);
513 return ret;
514 }
515
gfs2_others_may_mount(struct gfs2_sbd * sdp)516 static void gfs2_others_may_mount(struct gfs2_sbd *sdp)
517 {
518 char *message = "FIRSTMOUNT=Done";
519 char *envp[] = { message, NULL };
520
521 fs_info(sdp, "first mount done, others may mount\n");
522
523 if (sdp->sd_lockstruct.ls_ops->lm_first_done)
524 sdp->sd_lockstruct.ls_ops->lm_first_done(sdp);
525
526 kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp);
527 }
528
529 /**
530 * gfs2_jindex_hold - Grab a lock on the jindex
531 * @sdp: The GFS2 superblock
532 * @ji_gh: the holder for the jindex glock
533 *
534 * Returns: errno
535 */
536
gfs2_jindex_hold(struct gfs2_sbd * sdp,struct gfs2_holder * ji_gh)537 static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
538 {
539 struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex);
540 struct qstr name;
541 char buf[20];
542 struct gfs2_jdesc *jd;
543 int error;
544
545 name.name = buf;
546
547 mutex_lock(&sdp->sd_jindex_mutex);
548
549 for (;;) {
550 struct gfs2_inode *jip;
551
552 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh);
553 if (error)
554 break;
555
556 name.len = sprintf(buf, "journal%u", sdp->sd_journals);
557 name.hash = gfs2_disk_hash(name.name, name.len);
558
559 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL);
560 if (error == -ENOENT) {
561 error = 0;
562 break;
563 }
564
565 gfs2_glock_dq_uninit(ji_gh);
566
567 if (error)
568 break;
569
570 error = -ENOMEM;
571 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
572 if (!jd)
573 break;
574
575 INIT_LIST_HEAD(&jd->extent_list);
576 INIT_LIST_HEAD(&jd->jd_revoke_list);
577
578 INIT_WORK(&jd->jd_work, gfs2_recover_func);
579 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1);
580 if (IS_ERR_OR_NULL(jd->jd_inode)) {
581 if (!jd->jd_inode)
582 error = -ENOENT;
583 else
584 error = PTR_ERR(jd->jd_inode);
585 kfree(jd);
586 break;
587 }
588
589 d_mark_dontcache(jd->jd_inode);
590 spin_lock(&sdp->sd_jindex_spin);
591 jd->jd_jid = sdp->sd_journals++;
592 jip = GFS2_I(jd->jd_inode);
593 jd->jd_no_addr = jip->i_no_addr;
594 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
595 spin_unlock(&sdp->sd_jindex_spin);
596 }
597
598 mutex_unlock(&sdp->sd_jindex_mutex);
599
600 return error;
601 }
602
603 /**
604 * init_statfs - look up and initialize master and local (per node) statfs inodes
605 * @sdp: The GFS2 superblock
606 *
607 * This should be called after the jindex is initialized in init_journal() and
608 * before gfs2_journal_recovery() is called because we need to be able to write
609 * to these inodes during recovery.
610 *
611 * Returns: errno
612 */
init_statfs(struct gfs2_sbd * sdp)613 static int init_statfs(struct gfs2_sbd *sdp)
614 {
615 int error = 0;
616 struct inode *master = d_inode(sdp->sd_master_dir);
617 struct inode *pn = NULL;
618 char buf[30];
619 struct gfs2_jdesc *jd;
620 struct gfs2_inode *ip;
621
622 sdp->sd_statfs_inode = gfs2_lookup_meta(master, "statfs");
623 if (IS_ERR(sdp->sd_statfs_inode)) {
624 error = PTR_ERR(sdp->sd_statfs_inode);
625 fs_err(sdp, "can't read in statfs inode: %d\n", error);
626 goto out;
627 }
628 if (sdp->sd_args.ar_spectator)
629 goto out;
630
631 pn = gfs2_lookup_meta(master, "per_node");
632 if (IS_ERR(pn)) {
633 error = PTR_ERR(pn);
634 fs_err(sdp, "can't find per_node directory: %d\n", error);
635 goto put_statfs;
636 }
637
638 /* For each jid, lookup the corresponding local statfs inode in the
639 * per_node metafs directory and save it in the sdp->sd_sc_inodes_list. */
640 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
641 struct local_statfs_inode *lsi =
642 kmalloc(sizeof(struct local_statfs_inode), GFP_NOFS);
643 if (!lsi) {
644 error = -ENOMEM;
645 goto free_local;
646 }
647 sprintf(buf, "statfs_change%u", jd->jd_jid);
648 lsi->si_sc_inode = gfs2_lookup_meta(pn, buf);
649 if (IS_ERR(lsi->si_sc_inode)) {
650 error = PTR_ERR(lsi->si_sc_inode);
651 fs_err(sdp, "can't find local \"sc\" file#%u: %d\n",
652 jd->jd_jid, error);
653 kfree(lsi);
654 goto free_local;
655 }
656 lsi->si_jid = jd->jd_jid;
657 if (jd->jd_jid == sdp->sd_jdesc->jd_jid)
658 sdp->sd_sc_inode = lsi->si_sc_inode;
659
660 list_add_tail(&lsi->si_list, &sdp->sd_sc_inodes_list);
661 }
662
663 iput(pn);
664 pn = NULL;
665 ip = GFS2_I(sdp->sd_sc_inode);
666 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_NOPID,
667 &sdp->sd_sc_gh);
668 if (error) {
669 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
670 goto free_local;
671 }
672 /* read in the local statfs buffer - other nodes don't change it. */
673 error = gfs2_meta_inode_buffer(ip, &sdp->sd_sc_bh);
674 if (error) {
675 fs_err(sdp, "Cannot read in local statfs: %d\n", error);
676 goto unlock_sd_gh;
677 }
678 return 0;
679
680 unlock_sd_gh:
681 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
682 free_local:
683 free_local_statfs_inodes(sdp);
684 iput(pn);
685 put_statfs:
686 iput(sdp->sd_statfs_inode);
687 out:
688 return error;
689 }
690
691 /* Uninitialize and free up memory used by the list of statfs inodes */
uninit_statfs(struct gfs2_sbd * sdp)692 static void uninit_statfs(struct gfs2_sbd *sdp)
693 {
694 if (!sdp->sd_args.ar_spectator) {
695 brelse(sdp->sd_sc_bh);
696 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
697 free_local_statfs_inodes(sdp);
698 }
699 iput(sdp->sd_statfs_inode);
700 }
701
init_journal(struct gfs2_sbd * sdp,int undo)702 static int init_journal(struct gfs2_sbd *sdp, int undo)
703 {
704 struct inode *master = d_inode(sdp->sd_master_dir);
705 struct gfs2_holder ji_gh;
706 struct gfs2_inode *ip;
707 int error = 0;
708
709 gfs2_holder_mark_uninitialized(&ji_gh);
710 if (undo)
711 goto fail_statfs;
712
713 sdp->sd_jindex = gfs2_lookup_meta(master, "jindex");
714 if (IS_ERR(sdp->sd_jindex)) {
715 fs_err(sdp, "can't lookup journal index: %d\n", error);
716 return PTR_ERR(sdp->sd_jindex);
717 }
718
719 /* Load in the journal index special file */
720
721 error = gfs2_jindex_hold(sdp, &ji_gh);
722 if (error) {
723 fs_err(sdp, "can't read journal index: %d\n", error);
724 goto fail;
725 }
726
727 error = -EUSERS;
728 if (!gfs2_jindex_size(sdp)) {
729 fs_err(sdp, "no journals!\n");
730 goto fail_jindex;
731 }
732
733 atomic_set(&sdp->sd_log_blks_needed, 0);
734 if (sdp->sd_args.ar_spectator) {
735 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
736 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
737 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
738 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
739 } else {
740 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
741 fs_err(sdp, "can't mount journal #%u\n",
742 sdp->sd_lockstruct.ls_jid);
743 fs_err(sdp, "there are only %u journals (0 - %u)\n",
744 gfs2_jindex_size(sdp),
745 gfs2_jindex_size(sdp) - 1);
746 goto fail_jindex;
747 }
748 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
749
750 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
751 &gfs2_journal_glops,
752 LM_ST_EXCLUSIVE,
753 LM_FLAG_NOEXP | GL_NOCACHE | GL_NOPID,
754 &sdp->sd_journal_gh);
755 if (error) {
756 fs_err(sdp, "can't acquire journal glock: %d\n", error);
757 goto fail_jindex;
758 }
759
760 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
761 sdp->sd_jinode_gl = ip->i_gl;
762 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
763 LM_FLAG_NOEXP | GL_EXACT |
764 GL_NOCACHE | GL_NOPID,
765 &sdp->sd_jinode_gh);
766 if (error) {
767 fs_err(sdp, "can't acquire journal inode glock: %d\n",
768 error);
769 goto fail_journal_gh;
770 }
771
772 error = gfs2_jdesc_check(sdp->sd_jdesc);
773 if (error) {
774 fs_err(sdp, "my journal (%u) is bad: %d\n",
775 sdp->sd_jdesc->jd_jid, error);
776 goto fail_jinode_gh;
777 }
778 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
779 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
780 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
781
782 /* Map the extents for this journal's blocks */
783 gfs2_map_journal_extents(sdp, sdp->sd_jdesc);
784 }
785 trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free));
786
787 /* Lookup statfs inodes here so journal recovery can use them. */
788 error = init_statfs(sdp);
789 if (error)
790 goto fail_jinode_gh;
791
792 if (sdp->sd_lockstruct.ls_first) {
793 unsigned int x;
794 for (x = 0; x < sdp->sd_journals; x++) {
795 struct gfs2_jdesc *jd = gfs2_jdesc_find(sdp, x);
796
797 if (sdp->sd_args.ar_spectator) {
798 error = check_journal_clean(sdp, jd, true);
799 if (error)
800 goto fail_statfs;
801 continue;
802 }
803 error = gfs2_recover_journal(jd, true);
804 if (error) {
805 fs_err(sdp, "error recovering journal %u: %d\n",
806 x, error);
807 goto fail_statfs;
808 }
809 }
810
811 gfs2_others_may_mount(sdp);
812 } else if (!sdp->sd_args.ar_spectator) {
813 error = gfs2_recover_journal(sdp->sd_jdesc, true);
814 if (error) {
815 fs_err(sdp, "error recovering my journal: %d\n", error);
816 goto fail_statfs;
817 }
818 }
819
820 sdp->sd_log_idle = 1;
821 set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
822 gfs2_glock_dq_uninit(&ji_gh);
823 INIT_WORK(&sdp->sd_freeze_work, gfs2_freeze_func);
824 return 0;
825
826 fail_statfs:
827 uninit_statfs(sdp);
828 fail_jinode_gh:
829 /* A withdraw may have done dq/uninit so now we need to check it */
830 if (!sdp->sd_args.ar_spectator &&
831 gfs2_holder_initialized(&sdp->sd_jinode_gh))
832 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
833 fail_journal_gh:
834 if (!sdp->sd_args.ar_spectator &&
835 gfs2_holder_initialized(&sdp->sd_journal_gh))
836 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
837 fail_jindex:
838 gfs2_jindex_free(sdp);
839 if (gfs2_holder_initialized(&ji_gh))
840 gfs2_glock_dq_uninit(&ji_gh);
841 fail:
842 iput(sdp->sd_jindex);
843 return error;
844 }
845
846 static struct lock_class_key gfs2_quota_imutex_key;
847
init_inodes(struct gfs2_sbd * sdp,int undo)848 static int init_inodes(struct gfs2_sbd *sdp, int undo)
849 {
850 int error = 0;
851 struct inode *master = d_inode(sdp->sd_master_dir);
852
853 if (undo)
854 goto fail_qinode;
855
856 error = init_journal(sdp, undo);
857 complete_all(&sdp->sd_journal_ready);
858 if (error)
859 goto fail;
860
861 /* Read in the resource index inode */
862 sdp->sd_rindex = gfs2_lookup_meta(master, "rindex");
863 if (IS_ERR(sdp->sd_rindex)) {
864 error = PTR_ERR(sdp->sd_rindex);
865 fs_err(sdp, "can't get resource index inode: %d\n", error);
866 goto fail_journal;
867 }
868 sdp->sd_rindex_uptodate = 0;
869
870 /* Read in the quota inode */
871 sdp->sd_quota_inode = gfs2_lookup_meta(master, "quota");
872 if (IS_ERR(sdp->sd_quota_inode)) {
873 error = PTR_ERR(sdp->sd_quota_inode);
874 fs_err(sdp, "can't get quota file inode: %d\n", error);
875 goto fail_rindex;
876 }
877 /*
878 * i_rwsem on quota files is special. Since this inode is hidden system
879 * file, we are safe to define locking ourselves.
880 */
881 lockdep_set_class(&sdp->sd_quota_inode->i_rwsem,
882 &gfs2_quota_imutex_key);
883
884 error = gfs2_rindex_update(sdp);
885 if (error)
886 goto fail_qinode;
887
888 return 0;
889
890 fail_qinode:
891 iput(sdp->sd_quota_inode);
892 fail_rindex:
893 gfs2_clear_rgrpd(sdp);
894 iput(sdp->sd_rindex);
895 fail_journal:
896 init_journal(sdp, UNDO);
897 fail:
898 return error;
899 }
900
init_per_node(struct gfs2_sbd * sdp,int undo)901 static int init_per_node(struct gfs2_sbd *sdp, int undo)
902 {
903 struct inode *pn = NULL;
904 char buf[30];
905 int error = 0;
906 struct gfs2_inode *ip;
907 struct inode *master = d_inode(sdp->sd_master_dir);
908
909 if (sdp->sd_args.ar_spectator)
910 return 0;
911
912 if (undo)
913 goto fail_qc_gh;
914
915 pn = gfs2_lookup_meta(master, "per_node");
916 if (IS_ERR(pn)) {
917 error = PTR_ERR(pn);
918 fs_err(sdp, "can't find per_node directory: %d\n", error);
919 return error;
920 }
921
922 sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
923 sdp->sd_qc_inode = gfs2_lookup_meta(pn, buf);
924 if (IS_ERR(sdp->sd_qc_inode)) {
925 error = PTR_ERR(sdp->sd_qc_inode);
926 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
927 goto fail_ut_i;
928 }
929
930 iput(pn);
931 pn = NULL;
932
933 ip = GFS2_I(sdp->sd_qc_inode);
934 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_NOPID,
935 &sdp->sd_qc_gh);
936 if (error) {
937 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
938 goto fail_qc_i;
939 }
940
941 return 0;
942
943 fail_qc_gh:
944 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
945 fail_qc_i:
946 iput(sdp->sd_qc_inode);
947 fail_ut_i:
948 iput(pn);
949 return error;
950 }
951
952 static const match_table_t nolock_tokens = {
953 { Opt_jid, "jid=%d", },
954 { Opt_err, NULL },
955 };
956
957 static const struct lm_lockops nolock_ops = {
958 .lm_proto_name = "lock_nolock",
959 .lm_put_lock = gfs2_glock_free,
960 .lm_tokens = &nolock_tokens,
961 };
962
963 /**
964 * gfs2_lm_mount - mount a locking protocol
965 * @sdp: the filesystem
966 * @silent: if 1, don't complain if the FS isn't a GFS2 fs
967 *
968 * Returns: errno
969 */
970
gfs2_lm_mount(struct gfs2_sbd * sdp,int silent)971 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
972 {
973 const struct lm_lockops *lm;
974 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
975 struct gfs2_args *args = &sdp->sd_args;
976 const char *proto = sdp->sd_proto_name;
977 const char *table = sdp->sd_table_name;
978 char *o, *options;
979 int ret;
980
981 if (!strcmp("lock_nolock", proto)) {
982 lm = &nolock_ops;
983 sdp->sd_args.ar_localflocks = 1;
984 #ifdef CONFIG_GFS2_FS_LOCKING_DLM
985 } else if (!strcmp("lock_dlm", proto)) {
986 lm = &gfs2_dlm_ops;
987 #endif
988 } else {
989 pr_info("can't find protocol %s\n", proto);
990 return -ENOENT;
991 }
992
993 fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);
994
995 ls->ls_ops = lm;
996 ls->ls_first = 1;
997
998 for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) {
999 substring_t tmp[MAX_OPT_ARGS];
1000 int token, option;
1001
1002 if (!o || !*o)
1003 continue;
1004
1005 token = match_token(o, *lm->lm_tokens, tmp);
1006 switch (token) {
1007 case Opt_jid:
1008 ret = match_int(&tmp[0], &option);
1009 if (ret || option < 0)
1010 goto hostdata_error;
1011 if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags))
1012 ls->ls_jid = option;
1013 break;
1014 case Opt_id:
1015 case Opt_nodir:
1016 /* Obsolete, but left for backward compat purposes */
1017 break;
1018 case Opt_first:
1019 ret = match_int(&tmp[0], &option);
1020 if (ret || (option != 0 && option != 1))
1021 goto hostdata_error;
1022 ls->ls_first = option;
1023 break;
1024 case Opt_err:
1025 default:
1026 hostdata_error:
1027 fs_info(sdp, "unknown hostdata (%s)\n", o);
1028 return -EINVAL;
1029 }
1030 }
1031
1032 if (lm->lm_mount == NULL) {
1033 fs_info(sdp, "Now mounting FS (format %u)...\n", sdp->sd_sb.sb_fs_format);
1034 complete_all(&sdp->sd_locking_init);
1035 return 0;
1036 }
1037 ret = lm->lm_mount(sdp, table);
1038 if (ret == 0)
1039 fs_info(sdp, "Joined cluster. Now mounting FS (format %u)...\n",
1040 sdp->sd_sb.sb_fs_format);
1041 complete_all(&sdp->sd_locking_init);
1042 return ret;
1043 }
1044
gfs2_lm_unmount(struct gfs2_sbd * sdp)1045 void gfs2_lm_unmount(struct gfs2_sbd *sdp)
1046 {
1047 const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops;
1048 if (!gfs2_withdrawing_or_withdrawn(sdp) && lm->lm_unmount)
1049 lm->lm_unmount(sdp);
1050 }
1051
wait_on_journal(struct gfs2_sbd * sdp)1052 static int wait_on_journal(struct gfs2_sbd *sdp)
1053 {
1054 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
1055 return 0;
1056
1057 return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, TASK_INTERRUPTIBLE)
1058 ? -EINTR : 0;
1059 }
1060
gfs2_online_uevent(struct gfs2_sbd * sdp)1061 void gfs2_online_uevent(struct gfs2_sbd *sdp)
1062 {
1063 struct super_block *sb = sdp->sd_vfs;
1064 char ro[20];
1065 char spectator[20];
1066 char *envp[] = { ro, spectator, NULL };
1067 sprintf(ro, "RDONLY=%d", sb_rdonly(sb));
1068 sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
1069 kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp);
1070 }
1071
init_threads(struct gfs2_sbd * sdp)1072 static int init_threads(struct gfs2_sbd *sdp)
1073 {
1074 struct task_struct *p;
1075 int error = 0;
1076
1077 p = kthread_create(gfs2_logd, sdp, "gfs2_logd/%s", sdp->sd_fsname);
1078 if (IS_ERR(p)) {
1079 error = PTR_ERR(p);
1080 fs_err(sdp, "can't create logd thread: %d\n", error);
1081 return error;
1082 }
1083 get_task_struct(p);
1084 sdp->sd_logd_process = p;
1085
1086 p = kthread_create(gfs2_quotad, sdp, "gfs2_quotad/%s", sdp->sd_fsname);
1087 if (IS_ERR(p)) {
1088 error = PTR_ERR(p);
1089 fs_err(sdp, "can't create quotad thread: %d\n", error);
1090 goto fail;
1091 }
1092 get_task_struct(p);
1093 sdp->sd_quotad_process = p;
1094
1095 wake_up_process(sdp->sd_logd_process);
1096 wake_up_process(sdp->sd_quotad_process);
1097 return 0;
1098
1099 fail:
1100 kthread_stop_put(sdp->sd_logd_process);
1101 sdp->sd_logd_process = NULL;
1102 return error;
1103 }
1104
gfs2_destroy_threads(struct gfs2_sbd * sdp)1105 void gfs2_destroy_threads(struct gfs2_sbd *sdp)
1106 {
1107 if (sdp->sd_logd_process) {
1108 kthread_stop_put(sdp->sd_logd_process);
1109 sdp->sd_logd_process = NULL;
1110 }
1111 if (sdp->sd_quotad_process) {
1112 kthread_stop_put(sdp->sd_quotad_process);
1113 sdp->sd_quotad_process = NULL;
1114 }
1115 }
1116
1117 /**
1118 * gfs2_fill_super - Read in superblock
1119 * @sb: The VFS superblock
1120 * @fc: Mount options and flags
1121 *
1122 * Returns: -errno
1123 */
gfs2_fill_super(struct super_block * sb,struct fs_context * fc)1124 static int gfs2_fill_super(struct super_block *sb, struct fs_context *fc)
1125 {
1126 struct gfs2_args *args = fc->fs_private;
1127 int silent = fc->sb_flags & SB_SILENT;
1128 struct gfs2_sbd *sdp;
1129 struct gfs2_holder mount_gh;
1130 struct address_space *mapping;
1131 int error;
1132
1133 sdp = init_sbd(sb);
1134 if (!sdp) {
1135 pr_warn("can't alloc struct gfs2_sbd\n");
1136 return -ENOMEM;
1137 }
1138 sdp->sd_args = *args;
1139
1140 if (sdp->sd_args.ar_spectator) {
1141 sb->s_flags |= SB_RDONLY;
1142 set_bit(SDF_RORECOVERY, &sdp->sd_flags);
1143 }
1144 if (sdp->sd_args.ar_posix_acl)
1145 sb->s_flags |= SB_POSIXACL;
1146 if (sdp->sd_args.ar_nobarrier)
1147 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1148
1149 sb->s_flags |= SB_NOSEC;
1150 sb->s_magic = GFS2_MAGIC;
1151 sb->s_op = &gfs2_super_ops;
1152
1153 sb->s_d_op = &gfs2_dops;
1154 sb->s_export_op = &gfs2_export_ops;
1155 sb->s_qcop = &gfs2_quotactl_ops;
1156 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1157 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
1158 sb->s_time_gran = 1;
1159 sb->s_maxbytes = MAX_LFS_FILESIZE;
1160
1161 /* Set up the buffer cache and fill in some fake block size values
1162 to allow us to read-in the on-disk superblock. */
1163 sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, 512);
1164 sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
1165 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift - 9;
1166 sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift);
1167
1168 sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit;
1169 sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum;
1170 if (sdp->sd_args.ar_statfs_quantum) {
1171 sdp->sd_tune.gt_statfs_slow = 0;
1172 sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum;
1173 } else {
1174 sdp->sd_tune.gt_statfs_slow = 1;
1175 sdp->sd_tune.gt_statfs_quantum = 30;
1176 }
1177
1178 /* Set up an address space for metadata writes */
1179 sdp->sd_inode = new_inode(sb);
1180 error = -ENOMEM;
1181 if (!sdp->sd_inode)
1182 goto fail_free;
1183 sdp->sd_inode->i_ino = GFS2_BAD_INO;
1184 sdp->sd_inode->i_size = OFFSET_MAX;
1185
1186 mapping = gfs2_aspace(sdp);
1187 mapping->a_ops = &gfs2_rgrp_aops;
1188 mapping_set_gfp_mask(mapping, GFP_NOFS);
1189
1190 error = init_names(sdp, silent);
1191 if (error)
1192 goto fail_iput;
1193
1194 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s", sdp->sd_table_name);
1195
1196 error = -ENOMEM;
1197 sdp->sd_glock_wq = alloc_workqueue("gfs2-glock/%s",
1198 WQ_MEM_RECLAIM | WQ_HIGHPRI | WQ_FREEZABLE, 0,
1199 sdp->sd_fsname);
1200 if (!sdp->sd_glock_wq)
1201 goto fail_iput;
1202
1203 sdp->sd_delete_wq = alloc_workqueue("gfs2-delete/%s",
1204 WQ_MEM_RECLAIM | WQ_FREEZABLE, 0, 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 atomic_inc(&inode->i_count);
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