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 if (sdp->sd_lkstats)
68 free_percpu(sdp->sd_lkstats);
69 kfree(sdp);
70 }
71
init_sbd(struct super_block * sb)72 static struct gfs2_sbd *init_sbd(struct super_block *sb)
73 {
74 struct gfs2_sbd *sdp;
75 struct address_space *mapping;
76
77 sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL);
78 if (!sdp)
79 return NULL;
80
81 sdp->sd_vfs = sb;
82 sdp->sd_lkstats = alloc_percpu(struct gfs2_pcpu_lkstats);
83 if (!sdp->sd_lkstats)
84 goto fail;
85 sb->s_fs_info = sdp;
86
87 set_bit(SDF_NOJOURNALID, &sdp->sd_flags);
88 gfs2_tune_init(&sdp->sd_tune);
89
90 init_waitqueue_head(&sdp->sd_kill_wait);
91 init_waitqueue_head(&sdp->sd_async_glock_wait);
92 atomic_set(&sdp->sd_glock_disposal, 0);
93 init_completion(&sdp->sd_locking_init);
94 init_completion(&sdp->sd_wdack);
95 spin_lock_init(&sdp->sd_statfs_spin);
96
97 spin_lock_init(&sdp->sd_rindex_spin);
98 sdp->sd_rindex_tree.rb_node = NULL;
99
100 INIT_LIST_HEAD(&sdp->sd_jindex_list);
101 spin_lock_init(&sdp->sd_jindex_spin);
102 mutex_init(&sdp->sd_jindex_mutex);
103 init_completion(&sdp->sd_journal_ready);
104
105 INIT_LIST_HEAD(&sdp->sd_quota_list);
106 mutex_init(&sdp->sd_quota_mutex);
107 mutex_init(&sdp->sd_quota_sync_mutex);
108 init_waitqueue_head(&sdp->sd_quota_wait);
109 spin_lock_init(&sdp->sd_bitmap_lock);
110
111 INIT_LIST_HEAD(&sdp->sd_sc_inodes_list);
112
113 mapping = &sdp->sd_aspace;
114
115 address_space_init_once(mapping);
116 mapping->a_ops = &gfs2_rgrp_aops;
117 mapping->host = sb->s_bdev->bd_inode;
118 mapping->flags = 0;
119 mapping_set_gfp_mask(mapping, GFP_NOFS);
120 mapping->private_data = NULL;
121 mapping->writeback_index = 0;
122
123 spin_lock_init(&sdp->sd_log_lock);
124 atomic_set(&sdp->sd_log_pinned, 0);
125 INIT_LIST_HEAD(&sdp->sd_log_revokes);
126 INIT_LIST_HEAD(&sdp->sd_log_ordered);
127 spin_lock_init(&sdp->sd_ordered_lock);
128
129 init_waitqueue_head(&sdp->sd_log_waitq);
130 init_waitqueue_head(&sdp->sd_logd_waitq);
131 spin_lock_init(&sdp->sd_ail_lock);
132 INIT_LIST_HEAD(&sdp->sd_ail1_list);
133 INIT_LIST_HEAD(&sdp->sd_ail2_list);
134
135 init_rwsem(&sdp->sd_log_flush_lock);
136 atomic_set(&sdp->sd_log_in_flight, 0);
137 init_waitqueue_head(&sdp->sd_log_flush_wait);
138 mutex_init(&sdp->sd_freeze_mutex);
139
140 return sdp;
141
142 fail:
143 free_sbd(sdp);
144 return NULL;
145 }
146
147 /**
148 * gfs2_check_sb - Check superblock
149 * @sdp: the filesystem
150 * @silent: Don't print a message if the check fails
151 *
152 * Checks the version code of the FS is one that we understand how to
153 * read and that the sizes of the various on-disk structures have not
154 * changed.
155 */
156
gfs2_check_sb(struct gfs2_sbd * sdp,int silent)157 static int gfs2_check_sb(struct gfs2_sbd *sdp, int silent)
158 {
159 struct gfs2_sb_host *sb = &sdp->sd_sb;
160
161 if (sb->sb_magic != GFS2_MAGIC ||
162 sb->sb_type != GFS2_METATYPE_SB) {
163 if (!silent)
164 pr_warn("not a GFS2 filesystem\n");
165 return -EINVAL;
166 }
167
168 if (sb->sb_fs_format < GFS2_FS_FORMAT_MIN ||
169 sb->sb_fs_format > GFS2_FS_FORMAT_MAX ||
170 sb->sb_multihost_format != GFS2_FORMAT_MULTI) {
171 fs_warn(sdp, "Unknown on-disk format, unable to mount\n");
172 return -EINVAL;
173 }
174
175 if (sb->sb_bsize < 512 || sb->sb_bsize > PAGE_SIZE ||
176 (sb->sb_bsize & (sb->sb_bsize - 1))) {
177 pr_warn("Invalid block size\n");
178 return -EINVAL;
179 }
180 if (sb->sb_bsize_shift != ffs(sb->sb_bsize) - 1) {
181 pr_warn("Invalid block size shift\n");
182 return -EINVAL;
183 }
184 return 0;
185 }
186
end_bio_io_page(struct bio * bio)187 static void end_bio_io_page(struct bio *bio)
188 {
189 struct page *page = bio->bi_private;
190
191 if (!bio->bi_status)
192 SetPageUptodate(page);
193 else
194 pr_warn("error %d reading superblock\n", bio->bi_status);
195 unlock_page(page);
196 }
197
gfs2_sb_in(struct gfs2_sbd * sdp,const void * buf)198 static void gfs2_sb_in(struct gfs2_sbd *sdp, const void *buf)
199 {
200 struct gfs2_sb_host *sb = &sdp->sd_sb;
201 struct super_block *s = sdp->sd_vfs;
202 const struct gfs2_sb *str = buf;
203
204 sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic);
205 sb->sb_type = be32_to_cpu(str->sb_header.mh_type);
206 sb->sb_fs_format = be32_to_cpu(str->sb_fs_format);
207 sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format);
208 sb->sb_bsize = be32_to_cpu(str->sb_bsize);
209 sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift);
210 sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr);
211 sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino);
212 sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr);
213 sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino);
214
215 memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN);
216 memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN);
217 memcpy(&s->s_uuid, str->sb_uuid, 16);
218 }
219
220 /**
221 * gfs2_read_super - Read the gfs2 super block from disk
222 * @sdp: The GFS2 super block
223 * @sector: The location of the super block
224 * @silent: Don't print a message if the check fails
225 *
226 * This uses the bio functions to read the super block from disk
227 * because we want to be 100% sure that we never read cached data.
228 * A super block is read twice only during each GFS2 mount and is
229 * never written to by the filesystem. The first time its read no
230 * locks are held, and the only details which are looked at are those
231 * relating to the locking protocol. Once locking is up and working,
232 * the sb is read again under the lock to establish the location of
233 * the master directory (contains pointers to journals etc) and the
234 * root directory.
235 *
236 * Returns: 0 on success or error
237 */
238
gfs2_read_super(struct gfs2_sbd * sdp,sector_t sector,int silent)239 static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector, int silent)
240 {
241 struct super_block *sb = sdp->sd_vfs;
242 struct gfs2_sb *p;
243 struct page *page;
244 struct bio *bio;
245
246 page = alloc_page(GFP_NOFS);
247 if (unlikely(!page))
248 return -ENOMEM;
249
250 ClearPageUptodate(page);
251 ClearPageDirty(page);
252 lock_page(page);
253
254 bio = bio_alloc(sb->s_bdev, 1, REQ_OP_READ | REQ_META, GFP_NOFS);
255 bio->bi_iter.bi_sector = sector * (sb->s_blocksize >> 9);
256 __bio_add_page(bio, page, PAGE_SIZE, 0);
257
258 bio->bi_end_io = end_bio_io_page;
259 bio->bi_private = page;
260 submit_bio(bio);
261 wait_on_page_locked(page);
262 bio_put(bio);
263 if (!PageUptodate(page)) {
264 __free_page(page);
265 return -EIO;
266 }
267 p = kmap(page);
268 gfs2_sb_in(sdp, p);
269 kunmap(page);
270 __free_page(page);
271 return gfs2_check_sb(sdp, silent);
272 }
273
274 /**
275 * gfs2_read_sb - Read super block
276 * @sdp: The GFS2 superblock
277 * @silent: Don't print message if mount fails
278 *
279 */
280
gfs2_read_sb(struct gfs2_sbd * sdp,int silent)281 static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent)
282 {
283 u32 hash_blocks, ind_blocks, leaf_blocks;
284 u32 tmp_blocks;
285 unsigned int x;
286 int error;
287
288 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
289 if (error) {
290 if (!silent)
291 fs_err(sdp, "can't read superblock\n");
292 return error;
293 }
294
295 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
296 GFS2_BASIC_BLOCK_SHIFT;
297 sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift);
298 sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
299 sizeof(struct gfs2_dinode)) / sizeof(u64);
300 sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
301 sizeof(struct gfs2_meta_header)) / sizeof(u64);
302 sdp->sd_ldptrs = (sdp->sd_sb.sb_bsize -
303 sizeof(struct gfs2_log_descriptor)) / sizeof(u64);
304 sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
305 sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
306 sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
307 sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64);
308 sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
309 sizeof(struct gfs2_meta_header)) /
310 sizeof(struct gfs2_quota_change);
311 sdp->sd_blocks_per_bitmap = (sdp->sd_sb.sb_bsize -
312 sizeof(struct gfs2_meta_header))
313 * GFS2_NBBY; /* not the rgrp bitmap, subsequent bitmaps only */
314
315 /*
316 * We always keep at least one block reserved for revokes in
317 * transactions. This greatly simplifies allocating additional
318 * revoke blocks.
319 */
320 atomic_set(&sdp->sd_log_revokes_available, sdp->sd_ldptrs);
321
322 /* Compute maximum reservation required to add a entry to a directory */
323
324 hash_blocks = DIV_ROUND_UP(sizeof(u64) * BIT(GFS2_DIR_MAX_DEPTH),
325 sdp->sd_jbsize);
326
327 ind_blocks = 0;
328 for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
329 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
330 ind_blocks += tmp_blocks;
331 }
332
333 leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
334
335 sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
336
337 sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
338 sizeof(struct gfs2_dinode);
339 sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
340 for (x = 2;; x++) {
341 u64 space, d;
342 u32 m;
343
344 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
345 d = space;
346 m = do_div(d, sdp->sd_inptrs);
347
348 if (d != sdp->sd_heightsize[x - 1] || m)
349 break;
350 sdp->sd_heightsize[x] = space;
351 }
352 sdp->sd_max_height = x;
353 sdp->sd_heightsize[x] = ~0;
354 gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
355
356 sdp->sd_max_dents_per_leaf = (sdp->sd_sb.sb_bsize -
357 sizeof(struct gfs2_leaf)) /
358 GFS2_MIN_DIRENT_SIZE;
359 return 0;
360 }
361
init_names(struct gfs2_sbd * sdp,int silent)362 static int init_names(struct gfs2_sbd *sdp, int silent)
363 {
364 char *proto, *table;
365 int error = 0;
366
367 proto = sdp->sd_args.ar_lockproto;
368 table = sdp->sd_args.ar_locktable;
369
370 /* Try to autodetect */
371
372 if (!proto[0] || !table[0]) {
373 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
374 if (error)
375 return error;
376
377 if (!proto[0])
378 proto = sdp->sd_sb.sb_lockproto;
379 if (!table[0])
380 table = sdp->sd_sb.sb_locktable;
381 }
382
383 if (!table[0])
384 table = sdp->sd_vfs->s_id;
385
386 BUILD_BUG_ON(GFS2_LOCKNAME_LEN > GFS2_FSNAME_LEN);
387
388 strscpy(sdp->sd_proto_name, proto, GFS2_LOCKNAME_LEN);
389 strscpy(sdp->sd_table_name, table, GFS2_LOCKNAME_LEN);
390
391 table = sdp->sd_table_name;
392 while ((table = strchr(table, '/')))
393 *table = '_';
394
395 return error;
396 }
397
init_locking(struct gfs2_sbd * sdp,struct gfs2_holder * mount_gh,int undo)398 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
399 int undo)
400 {
401 int error = 0;
402
403 if (undo)
404 goto fail_trans;
405
406 error = gfs2_glock_nq_num(sdp,
407 GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
408 LM_ST_EXCLUSIVE,
409 LM_FLAG_NOEXP | GL_NOCACHE | GL_NOPID,
410 mount_gh);
411 if (error) {
412 fs_err(sdp, "can't acquire mount glock: %d\n", error);
413 goto fail;
414 }
415
416 error = gfs2_glock_nq_num(sdp,
417 GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
418 LM_ST_SHARED,
419 LM_FLAG_NOEXP | GL_EXACT | GL_NOPID,
420 &sdp->sd_live_gh);
421 if (error) {
422 fs_err(sdp, "can't acquire live glock: %d\n", error);
423 goto fail_mount;
424 }
425
426 error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
427 CREATE, &sdp->sd_rename_gl);
428 if (error) {
429 fs_err(sdp, "can't create rename glock: %d\n", error);
430 goto fail_live;
431 }
432
433 error = gfs2_glock_get(sdp, GFS2_FREEZE_LOCK, &gfs2_freeze_glops,
434 CREATE, &sdp->sd_freeze_gl);
435 if (error) {
436 fs_err(sdp, "can't create freeze glock: %d\n", error);
437 goto fail_rename;
438 }
439
440 return 0;
441
442 fail_trans:
443 gfs2_glock_put(sdp->sd_freeze_gl);
444 fail_rename:
445 gfs2_glock_put(sdp->sd_rename_gl);
446 fail_live:
447 gfs2_glock_dq_uninit(&sdp->sd_live_gh);
448 fail_mount:
449 gfs2_glock_dq_uninit(mount_gh);
450 fail:
451 return error;
452 }
453
gfs2_lookup_root(struct super_block * sb,struct dentry ** dptr,u64 no_addr,const char * name)454 static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr,
455 u64 no_addr, const char *name)
456 {
457 struct gfs2_sbd *sdp = sb->s_fs_info;
458 struct dentry *dentry;
459 struct inode *inode;
460
461 inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0,
462 GFS2_BLKST_FREE /* ignore */);
463 if (IS_ERR(inode)) {
464 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode));
465 return PTR_ERR(inode);
466 }
467 dentry = d_make_root(inode);
468 if (!dentry) {
469 fs_err(sdp, "can't alloc %s dentry\n", name);
470 return -ENOMEM;
471 }
472 *dptr = dentry;
473 return 0;
474 }
475
init_sb(struct gfs2_sbd * sdp,int silent)476 static int init_sb(struct gfs2_sbd *sdp, int silent)
477 {
478 struct super_block *sb = sdp->sd_vfs;
479 struct gfs2_holder sb_gh;
480 u64 no_addr;
481 int ret;
482
483 ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
484 LM_ST_SHARED, 0, &sb_gh);
485 if (ret) {
486 fs_err(sdp, "can't acquire superblock glock: %d\n", ret);
487 return ret;
488 }
489
490 ret = gfs2_read_sb(sdp, silent);
491 if (ret) {
492 fs_err(sdp, "can't read superblock: %d\n", ret);
493 goto out;
494 }
495
496 switch(sdp->sd_sb.sb_fs_format) {
497 case GFS2_FS_FORMAT_MAX:
498 sb->s_xattr = gfs2_xattr_handlers_max;
499 break;
500
501 case GFS2_FS_FORMAT_MIN:
502 sb->s_xattr = gfs2_xattr_handlers_min;
503 break;
504
505 default:
506 BUG();
507 }
508
509 /* Set up the buffer cache and SB for real */
510 if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) {
511 ret = -EINVAL;
512 fs_err(sdp, "FS block size (%u) is too small for device "
513 "block size (%u)\n",
514 sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev));
515 goto out;
516 }
517 if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
518 ret = -EINVAL;
519 fs_err(sdp, "FS block size (%u) is too big for machine "
520 "page size (%u)\n",
521 sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
522 goto out;
523 }
524 sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
525
526 /* Get the root inode */
527 no_addr = sdp->sd_sb.sb_root_dir.no_addr;
528 ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root");
529 if (ret)
530 goto out;
531
532 /* Get the master inode */
533 no_addr = sdp->sd_sb.sb_master_dir.no_addr;
534 ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master");
535 if (ret) {
536 dput(sdp->sd_root_dir);
537 goto out;
538 }
539 sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir);
540 out:
541 gfs2_glock_dq_uninit(&sb_gh);
542 return ret;
543 }
544
gfs2_others_may_mount(struct gfs2_sbd * sdp)545 static void gfs2_others_may_mount(struct gfs2_sbd *sdp)
546 {
547 char *message = "FIRSTMOUNT=Done";
548 char *envp[] = { message, NULL };
549
550 fs_info(sdp, "first mount done, others may mount\n");
551
552 if (sdp->sd_lockstruct.ls_ops->lm_first_done)
553 sdp->sd_lockstruct.ls_ops->lm_first_done(sdp);
554
555 kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp);
556 }
557
558 /**
559 * gfs2_jindex_hold - Grab a lock on the jindex
560 * @sdp: The GFS2 superblock
561 * @ji_gh: the holder for the jindex glock
562 *
563 * Returns: errno
564 */
565
gfs2_jindex_hold(struct gfs2_sbd * sdp,struct gfs2_holder * ji_gh)566 static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
567 {
568 struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex);
569 struct qstr name;
570 char buf[20];
571 struct gfs2_jdesc *jd;
572 int error;
573
574 name.name = buf;
575
576 mutex_lock(&sdp->sd_jindex_mutex);
577
578 for (;;) {
579 struct gfs2_inode *jip;
580
581 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh);
582 if (error)
583 break;
584
585 name.len = sprintf(buf, "journal%u", sdp->sd_journals);
586 name.hash = gfs2_disk_hash(name.name, name.len);
587
588 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL);
589 if (error == -ENOENT) {
590 error = 0;
591 break;
592 }
593
594 gfs2_glock_dq_uninit(ji_gh);
595
596 if (error)
597 break;
598
599 error = -ENOMEM;
600 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
601 if (!jd)
602 break;
603
604 INIT_LIST_HEAD(&jd->extent_list);
605 INIT_LIST_HEAD(&jd->jd_revoke_list);
606
607 INIT_WORK(&jd->jd_work, gfs2_recover_func);
608 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1);
609 if (IS_ERR_OR_NULL(jd->jd_inode)) {
610 if (!jd->jd_inode)
611 error = -ENOENT;
612 else
613 error = PTR_ERR(jd->jd_inode);
614 kfree(jd);
615 break;
616 }
617
618 d_mark_dontcache(jd->jd_inode);
619 spin_lock(&sdp->sd_jindex_spin);
620 jd->jd_jid = sdp->sd_journals++;
621 jip = GFS2_I(jd->jd_inode);
622 jd->jd_no_addr = jip->i_no_addr;
623 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
624 spin_unlock(&sdp->sd_jindex_spin);
625 }
626
627 mutex_unlock(&sdp->sd_jindex_mutex);
628
629 return error;
630 }
631
632 /**
633 * init_statfs - look up and initialize master and local (per node) statfs inodes
634 * @sdp: The GFS2 superblock
635 *
636 * This should be called after the jindex is initialized in init_journal() and
637 * before gfs2_journal_recovery() is called because we need to be able to write
638 * to these inodes during recovery.
639 *
640 * Returns: errno
641 */
init_statfs(struct gfs2_sbd * sdp)642 static int init_statfs(struct gfs2_sbd *sdp)
643 {
644 int error = 0;
645 struct inode *master = d_inode(sdp->sd_master_dir);
646 struct inode *pn = NULL;
647 char buf[30];
648 struct gfs2_jdesc *jd;
649 struct gfs2_inode *ip;
650
651 sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs");
652 if (IS_ERR(sdp->sd_statfs_inode)) {
653 error = PTR_ERR(sdp->sd_statfs_inode);
654 fs_err(sdp, "can't read in statfs inode: %d\n", error);
655 goto out;
656 }
657 if (sdp->sd_args.ar_spectator)
658 goto out;
659
660 pn = gfs2_lookup_simple(master, "per_node");
661 if (IS_ERR(pn)) {
662 error = PTR_ERR(pn);
663 fs_err(sdp, "can't find per_node directory: %d\n", error);
664 goto put_statfs;
665 }
666
667 /* For each jid, lookup the corresponding local statfs inode in the
668 * per_node metafs directory and save it in the sdp->sd_sc_inodes_list. */
669 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
670 struct local_statfs_inode *lsi =
671 kmalloc(sizeof(struct local_statfs_inode), GFP_NOFS);
672 if (!lsi) {
673 error = -ENOMEM;
674 goto free_local;
675 }
676 sprintf(buf, "statfs_change%u", jd->jd_jid);
677 lsi->si_sc_inode = gfs2_lookup_simple(pn, buf);
678 if (IS_ERR(lsi->si_sc_inode)) {
679 error = PTR_ERR(lsi->si_sc_inode);
680 fs_err(sdp, "can't find local \"sc\" file#%u: %d\n",
681 jd->jd_jid, error);
682 kfree(lsi);
683 goto free_local;
684 }
685 lsi->si_jid = jd->jd_jid;
686 if (jd->jd_jid == sdp->sd_jdesc->jd_jid)
687 sdp->sd_sc_inode = lsi->si_sc_inode;
688
689 list_add_tail(&lsi->si_list, &sdp->sd_sc_inodes_list);
690 }
691
692 iput(pn);
693 pn = NULL;
694 ip = GFS2_I(sdp->sd_sc_inode);
695 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_NOPID,
696 &sdp->sd_sc_gh);
697 if (error) {
698 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
699 goto free_local;
700 }
701 /* read in the local statfs buffer - other nodes don't change it. */
702 error = gfs2_meta_inode_buffer(ip, &sdp->sd_sc_bh);
703 if (error) {
704 fs_err(sdp, "Cannot read in local statfs: %d\n", error);
705 goto unlock_sd_gh;
706 }
707 return 0;
708
709 unlock_sd_gh:
710 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
711 free_local:
712 free_local_statfs_inodes(sdp);
713 iput(pn);
714 put_statfs:
715 iput(sdp->sd_statfs_inode);
716 out:
717 return error;
718 }
719
720 /* Uninitialize and free up memory used by the list of statfs inodes */
uninit_statfs(struct gfs2_sbd * sdp)721 static void uninit_statfs(struct gfs2_sbd *sdp)
722 {
723 if (!sdp->sd_args.ar_spectator) {
724 brelse(sdp->sd_sc_bh);
725 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
726 free_local_statfs_inodes(sdp);
727 }
728 iput(sdp->sd_statfs_inode);
729 }
730
init_journal(struct gfs2_sbd * sdp,int undo)731 static int init_journal(struct gfs2_sbd *sdp, int undo)
732 {
733 struct inode *master = d_inode(sdp->sd_master_dir);
734 struct gfs2_holder ji_gh;
735 struct gfs2_inode *ip;
736 int error = 0;
737
738 gfs2_holder_mark_uninitialized(&ji_gh);
739 if (undo)
740 goto fail_statfs;
741
742 sdp->sd_jindex = gfs2_lookup_simple(master, "jindex");
743 if (IS_ERR(sdp->sd_jindex)) {
744 fs_err(sdp, "can't lookup journal index: %d\n", error);
745 return PTR_ERR(sdp->sd_jindex);
746 }
747
748 /* Load in the journal index special file */
749
750 error = gfs2_jindex_hold(sdp, &ji_gh);
751 if (error) {
752 fs_err(sdp, "can't read journal index: %d\n", error);
753 goto fail;
754 }
755
756 error = -EUSERS;
757 if (!gfs2_jindex_size(sdp)) {
758 fs_err(sdp, "no journals!\n");
759 goto fail_jindex;
760 }
761
762 atomic_set(&sdp->sd_log_blks_needed, 0);
763 if (sdp->sd_args.ar_spectator) {
764 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
765 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
766 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
767 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
768 } else {
769 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
770 fs_err(sdp, "can't mount journal #%u\n",
771 sdp->sd_lockstruct.ls_jid);
772 fs_err(sdp, "there are only %u journals (0 - %u)\n",
773 gfs2_jindex_size(sdp),
774 gfs2_jindex_size(sdp) - 1);
775 goto fail_jindex;
776 }
777 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
778
779 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
780 &gfs2_journal_glops,
781 LM_ST_EXCLUSIVE,
782 LM_FLAG_NOEXP | GL_NOCACHE | GL_NOPID,
783 &sdp->sd_journal_gh);
784 if (error) {
785 fs_err(sdp, "can't acquire journal glock: %d\n", error);
786 goto fail_jindex;
787 }
788
789 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
790 sdp->sd_jinode_gl = ip->i_gl;
791 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
792 LM_FLAG_NOEXP | GL_EXACT |
793 GL_NOCACHE | GL_NOPID,
794 &sdp->sd_jinode_gh);
795 if (error) {
796 fs_err(sdp, "can't acquire journal inode glock: %d\n",
797 error);
798 goto fail_journal_gh;
799 }
800
801 error = gfs2_jdesc_check(sdp->sd_jdesc);
802 if (error) {
803 fs_err(sdp, "my journal (%u) is bad: %d\n",
804 sdp->sd_jdesc->jd_jid, error);
805 goto fail_jinode_gh;
806 }
807 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
808 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
809 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
810
811 /* Map the extents for this journal's blocks */
812 gfs2_map_journal_extents(sdp, sdp->sd_jdesc);
813 }
814 trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free));
815
816 /* Lookup statfs inodes here so journal recovery can use them. */
817 error = init_statfs(sdp);
818 if (error)
819 goto fail_jinode_gh;
820
821 if (sdp->sd_lockstruct.ls_first) {
822 unsigned int x;
823 for (x = 0; x < sdp->sd_journals; x++) {
824 struct gfs2_jdesc *jd = gfs2_jdesc_find(sdp, x);
825
826 if (sdp->sd_args.ar_spectator) {
827 error = check_journal_clean(sdp, jd, true);
828 if (error)
829 goto fail_statfs;
830 continue;
831 }
832 error = gfs2_recover_journal(jd, true);
833 if (error) {
834 fs_err(sdp, "error recovering journal %u: %d\n",
835 x, error);
836 goto fail_statfs;
837 }
838 }
839
840 gfs2_others_may_mount(sdp);
841 } else if (!sdp->sd_args.ar_spectator) {
842 error = gfs2_recover_journal(sdp->sd_jdesc, true);
843 if (error) {
844 fs_err(sdp, "error recovering my journal: %d\n", error);
845 goto fail_statfs;
846 }
847 }
848
849 sdp->sd_log_idle = 1;
850 set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
851 gfs2_glock_dq_uninit(&ji_gh);
852 INIT_WORK(&sdp->sd_freeze_work, gfs2_freeze_func);
853 return 0;
854
855 fail_statfs:
856 uninit_statfs(sdp);
857 fail_jinode_gh:
858 /* A withdraw may have done dq/uninit so now we need to check it */
859 if (!sdp->sd_args.ar_spectator &&
860 gfs2_holder_initialized(&sdp->sd_jinode_gh))
861 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
862 fail_journal_gh:
863 if (!sdp->sd_args.ar_spectator &&
864 gfs2_holder_initialized(&sdp->sd_journal_gh))
865 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
866 fail_jindex:
867 gfs2_jindex_free(sdp);
868 if (gfs2_holder_initialized(&ji_gh))
869 gfs2_glock_dq_uninit(&ji_gh);
870 fail:
871 iput(sdp->sd_jindex);
872 return error;
873 }
874
875 static struct lock_class_key gfs2_quota_imutex_key;
876
init_inodes(struct gfs2_sbd * sdp,int undo)877 static int init_inodes(struct gfs2_sbd *sdp, int undo)
878 {
879 int error = 0;
880 struct inode *master = d_inode(sdp->sd_master_dir);
881
882 if (undo)
883 goto fail_qinode;
884
885 error = init_journal(sdp, undo);
886 complete_all(&sdp->sd_journal_ready);
887 if (error)
888 goto fail;
889
890 /* Read in the resource index inode */
891 sdp->sd_rindex = gfs2_lookup_simple(master, "rindex");
892 if (IS_ERR(sdp->sd_rindex)) {
893 error = PTR_ERR(sdp->sd_rindex);
894 fs_err(sdp, "can't get resource index inode: %d\n", error);
895 goto fail_journal;
896 }
897 sdp->sd_rindex_uptodate = 0;
898
899 /* Read in the quota inode */
900 sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota");
901 if (IS_ERR(sdp->sd_quota_inode)) {
902 error = PTR_ERR(sdp->sd_quota_inode);
903 fs_err(sdp, "can't get quota file inode: %d\n", error);
904 goto fail_rindex;
905 }
906 /*
907 * i_rwsem on quota files is special. Since this inode is hidden system
908 * file, we are safe to define locking ourselves.
909 */
910 lockdep_set_class(&sdp->sd_quota_inode->i_rwsem,
911 &gfs2_quota_imutex_key);
912
913 error = gfs2_rindex_update(sdp);
914 if (error)
915 goto fail_qinode;
916
917 return 0;
918
919 fail_qinode:
920 iput(sdp->sd_quota_inode);
921 fail_rindex:
922 gfs2_clear_rgrpd(sdp);
923 iput(sdp->sd_rindex);
924 fail_journal:
925 init_journal(sdp, UNDO);
926 fail:
927 return error;
928 }
929
init_per_node(struct gfs2_sbd * sdp,int undo)930 static int init_per_node(struct gfs2_sbd *sdp, int undo)
931 {
932 struct inode *pn = NULL;
933 char buf[30];
934 int error = 0;
935 struct gfs2_inode *ip;
936 struct inode *master = d_inode(sdp->sd_master_dir);
937
938 if (sdp->sd_args.ar_spectator)
939 return 0;
940
941 if (undo)
942 goto fail_qc_gh;
943
944 pn = gfs2_lookup_simple(master, "per_node");
945 if (IS_ERR(pn)) {
946 error = PTR_ERR(pn);
947 fs_err(sdp, "can't find per_node directory: %d\n", error);
948 return error;
949 }
950
951 sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
952 sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
953 if (IS_ERR(sdp->sd_qc_inode)) {
954 error = PTR_ERR(sdp->sd_qc_inode);
955 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
956 goto fail_ut_i;
957 }
958
959 iput(pn);
960 pn = NULL;
961
962 ip = GFS2_I(sdp->sd_qc_inode);
963 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_NOPID,
964 &sdp->sd_qc_gh);
965 if (error) {
966 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
967 goto fail_qc_i;
968 }
969
970 return 0;
971
972 fail_qc_gh:
973 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
974 fail_qc_i:
975 iput(sdp->sd_qc_inode);
976 fail_ut_i:
977 iput(pn);
978 return error;
979 }
980
981 static const match_table_t nolock_tokens = {
982 { Opt_jid, "jid=%d", },
983 { Opt_err, NULL },
984 };
985
986 static const struct lm_lockops nolock_ops = {
987 .lm_proto_name = "lock_nolock",
988 .lm_put_lock = gfs2_glock_free,
989 .lm_tokens = &nolock_tokens,
990 };
991
992 /**
993 * gfs2_lm_mount - mount a locking protocol
994 * @sdp: the filesystem
995 * @silent: if 1, don't complain if the FS isn't a GFS2 fs
996 *
997 * Returns: errno
998 */
999
gfs2_lm_mount(struct gfs2_sbd * sdp,int silent)1000 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
1001 {
1002 const struct lm_lockops *lm;
1003 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
1004 struct gfs2_args *args = &sdp->sd_args;
1005 const char *proto = sdp->sd_proto_name;
1006 const char *table = sdp->sd_table_name;
1007 char *o, *options;
1008 int ret;
1009
1010 if (!strcmp("lock_nolock", proto)) {
1011 lm = &nolock_ops;
1012 sdp->sd_args.ar_localflocks = 1;
1013 #ifdef CONFIG_GFS2_FS_LOCKING_DLM
1014 } else if (!strcmp("lock_dlm", proto)) {
1015 lm = &gfs2_dlm_ops;
1016 #endif
1017 } else {
1018 pr_info("can't find protocol %s\n", proto);
1019 return -ENOENT;
1020 }
1021
1022 fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);
1023
1024 ls->ls_ops = lm;
1025 ls->ls_first = 1;
1026
1027 for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) {
1028 substring_t tmp[MAX_OPT_ARGS];
1029 int token, option;
1030
1031 if (!o || !*o)
1032 continue;
1033
1034 token = match_token(o, *lm->lm_tokens, tmp);
1035 switch (token) {
1036 case Opt_jid:
1037 ret = match_int(&tmp[0], &option);
1038 if (ret || option < 0)
1039 goto hostdata_error;
1040 if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags))
1041 ls->ls_jid = option;
1042 break;
1043 case Opt_id:
1044 case Opt_nodir:
1045 /* Obsolete, but left for backward compat purposes */
1046 break;
1047 case Opt_first:
1048 ret = match_int(&tmp[0], &option);
1049 if (ret || (option != 0 && option != 1))
1050 goto hostdata_error;
1051 ls->ls_first = option;
1052 break;
1053 case Opt_err:
1054 default:
1055 hostdata_error:
1056 fs_info(sdp, "unknown hostdata (%s)\n", o);
1057 return -EINVAL;
1058 }
1059 }
1060
1061 if (lm->lm_mount == NULL) {
1062 fs_info(sdp, "Now mounting FS (format %u)...\n", sdp->sd_sb.sb_fs_format);
1063 complete_all(&sdp->sd_locking_init);
1064 return 0;
1065 }
1066 ret = lm->lm_mount(sdp, table);
1067 if (ret == 0)
1068 fs_info(sdp, "Joined cluster. Now mounting FS (format %u)...\n",
1069 sdp->sd_sb.sb_fs_format);
1070 complete_all(&sdp->sd_locking_init);
1071 return ret;
1072 }
1073
gfs2_lm_unmount(struct gfs2_sbd * sdp)1074 void gfs2_lm_unmount(struct gfs2_sbd *sdp)
1075 {
1076 const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops;
1077 if (likely(!gfs2_withdrawn(sdp)) && lm->lm_unmount)
1078 lm->lm_unmount(sdp);
1079 }
1080
wait_on_journal(struct gfs2_sbd * sdp)1081 static int wait_on_journal(struct gfs2_sbd *sdp)
1082 {
1083 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
1084 return 0;
1085
1086 return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, TASK_INTERRUPTIBLE)
1087 ? -EINTR : 0;
1088 }
1089
gfs2_online_uevent(struct gfs2_sbd * sdp)1090 void gfs2_online_uevent(struct gfs2_sbd *sdp)
1091 {
1092 struct super_block *sb = sdp->sd_vfs;
1093 char ro[20];
1094 char spectator[20];
1095 char *envp[] = { ro, spectator, NULL };
1096 sprintf(ro, "RDONLY=%d", sb_rdonly(sb));
1097 sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
1098 kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp);
1099 }
1100
init_threads(struct gfs2_sbd * sdp)1101 static int init_threads(struct gfs2_sbd *sdp)
1102 {
1103 struct task_struct *p;
1104 int error = 0;
1105
1106 p = kthread_create(gfs2_logd, sdp, "gfs2_logd/%s", sdp->sd_fsname);
1107 if (IS_ERR(p)) {
1108 error = PTR_ERR(p);
1109 fs_err(sdp, "can't create logd thread: %d\n", error);
1110 return error;
1111 }
1112 get_task_struct(p);
1113 sdp->sd_logd_process = p;
1114
1115 p = kthread_create(gfs2_quotad, sdp, "gfs2_quotad/%s", sdp->sd_fsname);
1116 if (IS_ERR(p)) {
1117 error = PTR_ERR(p);
1118 fs_err(sdp, "can't create quotad thread: %d\n", error);
1119 goto fail;
1120 }
1121 get_task_struct(p);
1122 sdp->sd_quotad_process = p;
1123
1124 wake_up_process(sdp->sd_logd_process);
1125 wake_up_process(sdp->sd_quotad_process);
1126 return 0;
1127
1128 fail:
1129 kthread_stop(sdp->sd_logd_process);
1130 put_task_struct(sdp->sd_logd_process);
1131 sdp->sd_logd_process = NULL;
1132 return error;
1133 }
1134
gfs2_destroy_threads(struct gfs2_sbd * sdp)1135 void gfs2_destroy_threads(struct gfs2_sbd *sdp)
1136 {
1137 if (sdp->sd_logd_process) {
1138 kthread_stop(sdp->sd_logd_process);
1139 put_task_struct(sdp->sd_logd_process);
1140 sdp->sd_logd_process = NULL;
1141 }
1142 if (sdp->sd_quotad_process) {
1143 kthread_stop(sdp->sd_quotad_process);
1144 put_task_struct(sdp->sd_quotad_process);
1145 sdp->sd_quotad_process = NULL;
1146 }
1147 }
1148
1149 /**
1150 * gfs2_fill_super - Read in superblock
1151 * @sb: The VFS superblock
1152 * @fc: Mount options and flags
1153 *
1154 * Returns: -errno
1155 */
gfs2_fill_super(struct super_block * sb,struct fs_context * fc)1156 static int gfs2_fill_super(struct super_block *sb, struct fs_context *fc)
1157 {
1158 struct gfs2_args *args = fc->fs_private;
1159 int silent = fc->sb_flags & SB_SILENT;
1160 struct gfs2_sbd *sdp;
1161 struct gfs2_holder mount_gh;
1162 int error;
1163
1164 sdp = init_sbd(sb);
1165 if (!sdp) {
1166 pr_warn("can't alloc struct gfs2_sbd\n");
1167 return -ENOMEM;
1168 }
1169 sdp->sd_args = *args;
1170
1171 if (sdp->sd_args.ar_spectator) {
1172 sb->s_flags |= SB_RDONLY;
1173 set_bit(SDF_RORECOVERY, &sdp->sd_flags);
1174 }
1175 if (sdp->sd_args.ar_posix_acl)
1176 sb->s_flags |= SB_POSIXACL;
1177 if (sdp->sd_args.ar_nobarrier)
1178 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1179
1180 sb->s_flags |= SB_NOSEC;
1181 sb->s_magic = GFS2_MAGIC;
1182 sb->s_op = &gfs2_super_ops;
1183 sb->s_d_op = &gfs2_dops;
1184 sb->s_export_op = &gfs2_export_ops;
1185 sb->s_qcop = &gfs2_quotactl_ops;
1186 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1187 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
1188 sb->s_time_gran = 1;
1189 sb->s_maxbytes = MAX_LFS_FILESIZE;
1190
1191 /* Set up the buffer cache and fill in some fake block size values
1192 to allow us to read-in the on-disk superblock. */
1193 sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
1194 sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
1195 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
1196 GFS2_BASIC_BLOCK_SHIFT;
1197 sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift);
1198
1199 sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit;
1200 sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum;
1201 if (sdp->sd_args.ar_statfs_quantum) {
1202 sdp->sd_tune.gt_statfs_slow = 0;
1203 sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum;
1204 } else {
1205 sdp->sd_tune.gt_statfs_slow = 1;
1206 sdp->sd_tune.gt_statfs_quantum = 30;
1207 }
1208
1209 error = init_names(sdp, silent);
1210 if (error)
1211 goto fail_free;
1212
1213 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s", sdp->sd_table_name);
1214
1215 sdp->sd_delete_wq = alloc_workqueue("gfs2-delete/%s",
1216 WQ_MEM_RECLAIM | WQ_FREEZABLE, 0, sdp->sd_fsname);
1217 error = -ENOMEM;
1218 if (!sdp->sd_delete_wq)
1219 goto fail_free;
1220
1221 error = gfs2_sys_fs_add(sdp);
1222 if (error)
1223 goto fail_delete_wq;
1224
1225 gfs2_create_debugfs_file(sdp);
1226
1227 error = gfs2_lm_mount(sdp, silent);
1228 if (error)
1229 goto fail_debug;
1230
1231 error = init_locking(sdp, &mount_gh, DO);
1232 if (error)
1233 goto fail_lm;
1234
1235 error = init_sb(sdp, silent);
1236 if (error)
1237 goto fail_locking;
1238
1239 /* Turn rgrplvb on by default if fs format is recent enough */
1240 if (!sdp->sd_args.ar_got_rgrplvb && sdp->sd_sb.sb_fs_format > 1801)
1241 sdp->sd_args.ar_rgrplvb = 1;
1242
1243 error = wait_on_journal(sdp);
1244 if (error)
1245 goto fail_sb;
1246
1247 /*
1248 * If user space has failed to join the cluster or some similar
1249 * failure has occurred, then the journal id will contain a
1250 * negative (error) number. This will then be returned to the
1251 * caller (of the mount syscall). We do this even for spectator
1252 * mounts (which just write a jid of 0 to indicate "ok" even though
1253 * the jid is unused in the spectator case)
1254 */
1255 if (sdp->sd_lockstruct.ls_jid < 0) {
1256 error = sdp->sd_lockstruct.ls_jid;
1257 sdp->sd_lockstruct.ls_jid = 0;
1258 goto fail_sb;
1259 }
1260
1261 if (sdp->sd_args.ar_spectator)
1262 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.s",
1263 sdp->sd_table_name);
1264 else
1265 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.%u",
1266 sdp->sd_table_name, sdp->sd_lockstruct.ls_jid);
1267
1268 error = init_inodes(sdp, DO);
1269 if (error)
1270 goto fail_sb;
1271
1272 error = init_per_node(sdp, DO);
1273 if (error)
1274 goto fail_inodes;
1275
1276 error = gfs2_statfs_init(sdp);
1277 if (error) {
1278 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
1279 goto fail_per_node;
1280 }
1281
1282 if (!sb_rdonly(sb)) {
1283 error = init_threads(sdp);
1284 if (error)
1285 goto fail_per_node;
1286 }
1287
1288 error = gfs2_freeze_lock_shared(sdp);
1289 if (error)
1290 goto fail_per_node;
1291
1292 if (!sb_rdonly(sb))
1293 error = gfs2_make_fs_rw(sdp);
1294
1295 if (error) {
1296 gfs2_freeze_unlock(&sdp->sd_freeze_gh);
1297 gfs2_destroy_threads(sdp);
1298 fs_err(sdp, "can't make FS RW: %d\n", error);
1299 goto fail_per_node;
1300 }
1301 gfs2_glock_dq_uninit(&mount_gh);
1302 gfs2_online_uevent(sdp);
1303 return 0;
1304
1305 fail_per_node:
1306 init_per_node(sdp, UNDO);
1307 fail_inodes:
1308 init_inodes(sdp, UNDO);
1309 fail_sb:
1310 if (sdp->sd_root_dir)
1311 dput(sdp->sd_root_dir);
1312 if (sdp->sd_master_dir)
1313 dput(sdp->sd_master_dir);
1314 if (sb->s_root)
1315 dput(sb->s_root);
1316 sb->s_root = NULL;
1317 fail_locking:
1318 init_locking(sdp, &mount_gh, UNDO);
1319 fail_lm:
1320 complete_all(&sdp->sd_journal_ready);
1321 gfs2_gl_hash_clear(sdp);
1322 gfs2_lm_unmount(sdp);
1323 fail_debug:
1324 gfs2_delete_debugfs_file(sdp);
1325 gfs2_sys_fs_del(sdp);
1326 fail_delete_wq:
1327 destroy_workqueue(sdp->sd_delete_wq);
1328 fail_free:
1329 free_sbd(sdp);
1330 sb->s_fs_info = NULL;
1331 return error;
1332 }
1333
1334 /**
1335 * gfs2_get_tree - Get the GFS2 superblock and root directory
1336 * @fc: The filesystem context
1337 *
1338 * Returns: 0 or -errno on error
1339 */
gfs2_get_tree(struct fs_context * fc)1340 static int gfs2_get_tree(struct fs_context *fc)
1341 {
1342 struct gfs2_args *args = fc->fs_private;
1343 struct gfs2_sbd *sdp;
1344 int error;
1345
1346 error = get_tree_bdev(fc, gfs2_fill_super);
1347 if (error)
1348 return error;
1349
1350 sdp = fc->root->d_sb->s_fs_info;
1351 dput(fc->root);
1352 if (args->ar_meta)
1353 fc->root = dget(sdp->sd_master_dir);
1354 else
1355 fc->root = dget(sdp->sd_root_dir);
1356 return 0;
1357 }
1358
gfs2_fc_free(struct fs_context * fc)1359 static void gfs2_fc_free(struct fs_context *fc)
1360 {
1361 struct gfs2_args *args = fc->fs_private;
1362
1363 kfree(args);
1364 }
1365
1366 enum gfs2_param {
1367 Opt_lockproto,
1368 Opt_locktable,
1369 Opt_hostdata,
1370 Opt_spectator,
1371 Opt_ignore_local_fs,
1372 Opt_localflocks,
1373 Opt_localcaching,
1374 Opt_debug,
1375 Opt_upgrade,
1376 Opt_acl,
1377 Opt_quota,
1378 Opt_quota_flag,
1379 Opt_suiddir,
1380 Opt_data,
1381 Opt_meta,
1382 Opt_discard,
1383 Opt_commit,
1384 Opt_errors,
1385 Opt_statfs_quantum,
1386 Opt_statfs_percent,
1387 Opt_quota_quantum,
1388 Opt_barrier,
1389 Opt_rgrplvb,
1390 Opt_loccookie,
1391 };
1392
1393 static const struct constant_table gfs2_param_quota[] = {
1394 {"off", GFS2_QUOTA_OFF},
1395 {"account", GFS2_QUOTA_ACCOUNT},
1396 {"on", GFS2_QUOTA_ON},
1397 {"quiet", GFS2_QUOTA_QUIET},
1398 {}
1399 };
1400
1401 enum opt_data {
1402 Opt_data_writeback = GFS2_DATA_WRITEBACK,
1403 Opt_data_ordered = GFS2_DATA_ORDERED,
1404 };
1405
1406 static const struct constant_table gfs2_param_data[] = {
1407 {"writeback", Opt_data_writeback },
1408 {"ordered", Opt_data_ordered },
1409 {}
1410 };
1411
1412 enum opt_errors {
1413 Opt_errors_withdraw = GFS2_ERRORS_WITHDRAW,
1414 Opt_errors_panic = GFS2_ERRORS_PANIC,
1415 };
1416
1417 static const struct constant_table gfs2_param_errors[] = {
1418 {"withdraw", Opt_errors_withdraw },
1419 {"panic", Opt_errors_panic },
1420 {}
1421 };
1422
1423 static const struct fs_parameter_spec gfs2_fs_parameters[] = {
1424 fsparam_string ("lockproto", Opt_lockproto),
1425 fsparam_string ("locktable", Opt_locktable),
1426 fsparam_string ("hostdata", Opt_hostdata),
1427 fsparam_flag ("spectator", Opt_spectator),
1428 fsparam_flag ("norecovery", Opt_spectator),
1429 fsparam_flag ("ignore_local_fs", Opt_ignore_local_fs),
1430 fsparam_flag ("localflocks", Opt_localflocks),
1431 fsparam_flag ("localcaching", Opt_localcaching),
1432 fsparam_flag_no("debug", Opt_debug),
1433 fsparam_flag ("upgrade", Opt_upgrade),
1434 fsparam_flag_no("acl", Opt_acl),
1435 fsparam_flag_no("suiddir", Opt_suiddir),
1436 fsparam_enum ("data", Opt_data, gfs2_param_data),
1437 fsparam_flag ("meta", Opt_meta),
1438 fsparam_flag_no("discard", Opt_discard),
1439 fsparam_s32 ("commit", Opt_commit),
1440 fsparam_enum ("errors", Opt_errors, gfs2_param_errors),
1441 fsparam_s32 ("statfs_quantum", Opt_statfs_quantum),
1442 fsparam_s32 ("statfs_percent", Opt_statfs_percent),
1443 fsparam_s32 ("quota_quantum", Opt_quota_quantum),
1444 fsparam_flag_no("barrier", Opt_barrier),
1445 fsparam_flag_no("rgrplvb", Opt_rgrplvb),
1446 fsparam_flag_no("loccookie", Opt_loccookie),
1447 /* quota can be a flag or an enum so it gets special treatment */
1448 fsparam_flag_no("quota", Opt_quota_flag),
1449 fsparam_enum("quota", Opt_quota, gfs2_param_quota),
1450 {}
1451 };
1452
1453 /* Parse a single mount parameter */
gfs2_parse_param(struct fs_context * fc,struct fs_parameter * param)1454 static int gfs2_parse_param(struct fs_context *fc, struct fs_parameter *param)
1455 {
1456 struct gfs2_args *args = fc->fs_private;
1457 struct fs_parse_result result;
1458 int o;
1459
1460 o = fs_parse(fc, gfs2_fs_parameters, param, &result);
1461 if (o < 0)
1462 return o;
1463
1464 switch (o) {
1465 case Opt_lockproto:
1466 strscpy(args->ar_lockproto, param->string, GFS2_LOCKNAME_LEN);
1467 break;
1468 case Opt_locktable:
1469 strscpy(args->ar_locktable, param->string, GFS2_LOCKNAME_LEN);
1470 break;
1471 case Opt_hostdata:
1472 strscpy(args->ar_hostdata, param->string, GFS2_LOCKNAME_LEN);
1473 break;
1474 case Opt_spectator:
1475 args->ar_spectator = 1;
1476 break;
1477 case Opt_ignore_local_fs:
1478 /* Retained for backwards compat only */
1479 break;
1480 case Opt_localflocks:
1481 args->ar_localflocks = 1;
1482 break;
1483 case Opt_localcaching:
1484 /* Retained for backwards compat only */
1485 break;
1486 case Opt_debug:
1487 if (result.boolean && args->ar_errors == GFS2_ERRORS_PANIC)
1488 return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive");
1489 args->ar_debug = result.boolean;
1490 break;
1491 case Opt_upgrade:
1492 /* Retained for backwards compat only */
1493 break;
1494 case Opt_acl:
1495 args->ar_posix_acl = result.boolean;
1496 break;
1497 case Opt_quota_flag:
1498 args->ar_quota = result.negated ? GFS2_QUOTA_OFF : GFS2_QUOTA_ON;
1499 break;
1500 case Opt_quota:
1501 args->ar_quota = result.int_32;
1502 break;
1503 case Opt_suiddir:
1504 args->ar_suiddir = result.boolean;
1505 break;
1506 case Opt_data:
1507 /* The uint_32 result maps directly to GFS2_DATA_* */
1508 args->ar_data = result.uint_32;
1509 break;
1510 case Opt_meta:
1511 args->ar_meta = 1;
1512 break;
1513 case Opt_discard:
1514 args->ar_discard = result.boolean;
1515 break;
1516 case Opt_commit:
1517 if (result.int_32 <= 0)
1518 return invalfc(fc, "commit mount option requires a positive numeric argument");
1519 args->ar_commit = result.int_32;
1520 break;
1521 case Opt_statfs_quantum:
1522 if (result.int_32 < 0)
1523 return invalfc(fc, "statfs_quantum mount option requires a non-negative numeric argument");
1524 args->ar_statfs_quantum = result.int_32;
1525 break;
1526 case Opt_quota_quantum:
1527 if (result.int_32 <= 0)
1528 return invalfc(fc, "quota_quantum mount option requires a positive numeric argument");
1529 args->ar_quota_quantum = result.int_32;
1530 break;
1531 case Opt_statfs_percent:
1532 if (result.int_32 < 0 || result.int_32 > 100)
1533 return invalfc(fc, "statfs_percent mount option requires a numeric argument between 0 and 100");
1534 args->ar_statfs_percent = result.int_32;
1535 break;
1536 case Opt_errors:
1537 if (args->ar_debug && result.uint_32 == GFS2_ERRORS_PANIC)
1538 return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive");
1539 args->ar_errors = result.uint_32;
1540 break;
1541 case Opt_barrier:
1542 args->ar_nobarrier = result.boolean;
1543 break;
1544 case Opt_rgrplvb:
1545 args->ar_rgrplvb = result.boolean;
1546 args->ar_got_rgrplvb = 1;
1547 break;
1548 case Opt_loccookie:
1549 args->ar_loccookie = result.boolean;
1550 break;
1551 default:
1552 return invalfc(fc, "invalid mount option: %s", param->key);
1553 }
1554 return 0;
1555 }
1556
gfs2_reconfigure(struct fs_context * fc)1557 static int gfs2_reconfigure(struct fs_context *fc)
1558 {
1559 struct super_block *sb = fc->root->d_sb;
1560 struct gfs2_sbd *sdp = sb->s_fs_info;
1561 struct gfs2_args *oldargs = &sdp->sd_args;
1562 struct gfs2_args *newargs = fc->fs_private;
1563 struct gfs2_tune *gt = &sdp->sd_tune;
1564 int error = 0;
1565
1566 sync_filesystem(sb);
1567
1568 spin_lock(>->gt_spin);
1569 oldargs->ar_commit = gt->gt_logd_secs;
1570 oldargs->ar_quota_quantum = gt->gt_quota_quantum;
1571 if (gt->gt_statfs_slow)
1572 oldargs->ar_statfs_quantum = 0;
1573 else
1574 oldargs->ar_statfs_quantum = gt->gt_statfs_quantum;
1575 spin_unlock(>->gt_spin);
1576
1577 if (strcmp(newargs->ar_lockproto, oldargs->ar_lockproto)) {
1578 errorfc(fc, "reconfiguration of locking protocol not allowed");
1579 return -EINVAL;
1580 }
1581 if (strcmp(newargs->ar_locktable, oldargs->ar_locktable)) {
1582 errorfc(fc, "reconfiguration of lock table not allowed");
1583 return -EINVAL;
1584 }
1585 if (strcmp(newargs->ar_hostdata, oldargs->ar_hostdata)) {
1586 errorfc(fc, "reconfiguration of host data not allowed");
1587 return -EINVAL;
1588 }
1589 if (newargs->ar_spectator != oldargs->ar_spectator) {
1590 errorfc(fc, "reconfiguration of spectator mode not allowed");
1591 return -EINVAL;
1592 }
1593 if (newargs->ar_localflocks != oldargs->ar_localflocks) {
1594 errorfc(fc, "reconfiguration of localflocks not allowed");
1595 return -EINVAL;
1596 }
1597 if (newargs->ar_meta != oldargs->ar_meta) {
1598 errorfc(fc, "switching between gfs2 and gfs2meta not allowed");
1599 return -EINVAL;
1600 }
1601 if (oldargs->ar_spectator)
1602 fc->sb_flags |= SB_RDONLY;
1603
1604 if ((sb->s_flags ^ fc->sb_flags) & SB_RDONLY) {
1605 if (fc->sb_flags & SB_RDONLY) {
1606 gfs2_make_fs_ro(sdp);
1607 } else {
1608 error = gfs2_make_fs_rw(sdp);
1609 if (error)
1610 errorfc(fc, "unable to remount read-write");
1611 }
1612 }
1613 sdp->sd_args = *newargs;
1614
1615 if (sdp->sd_args.ar_posix_acl)
1616 sb->s_flags |= SB_POSIXACL;
1617 else
1618 sb->s_flags &= ~SB_POSIXACL;
1619 if (sdp->sd_args.ar_nobarrier)
1620 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1621 else
1622 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1623 spin_lock(>->gt_spin);
1624 gt->gt_logd_secs = newargs->ar_commit;
1625 gt->gt_quota_quantum = newargs->ar_quota_quantum;
1626 if (newargs->ar_statfs_quantum) {
1627 gt->gt_statfs_slow = 0;
1628 gt->gt_statfs_quantum = newargs->ar_statfs_quantum;
1629 }
1630 else {
1631 gt->gt_statfs_slow = 1;
1632 gt->gt_statfs_quantum = 30;
1633 }
1634 spin_unlock(>->gt_spin);
1635
1636 gfs2_online_uevent(sdp);
1637 return error;
1638 }
1639
1640 static const struct fs_context_operations gfs2_context_ops = {
1641 .free = gfs2_fc_free,
1642 .parse_param = gfs2_parse_param,
1643 .get_tree = gfs2_get_tree,
1644 .reconfigure = gfs2_reconfigure,
1645 };
1646
1647 /* Set up the filesystem mount context */
gfs2_init_fs_context(struct fs_context * fc)1648 static int gfs2_init_fs_context(struct fs_context *fc)
1649 {
1650 struct gfs2_args *args;
1651
1652 args = kmalloc(sizeof(*args), GFP_KERNEL);
1653 if (args == NULL)
1654 return -ENOMEM;
1655
1656 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
1657 struct gfs2_sbd *sdp = fc->root->d_sb->s_fs_info;
1658
1659 *args = sdp->sd_args;
1660 } else {
1661 memset(args, 0, sizeof(*args));
1662 args->ar_quota = GFS2_QUOTA_DEFAULT;
1663 args->ar_data = GFS2_DATA_DEFAULT;
1664 args->ar_commit = 30;
1665 args->ar_statfs_quantum = 30;
1666 args->ar_quota_quantum = 60;
1667 args->ar_errors = GFS2_ERRORS_DEFAULT;
1668 }
1669 fc->fs_private = args;
1670 fc->ops = &gfs2_context_ops;
1671 return 0;
1672 }
1673
set_meta_super(struct super_block * s,struct fs_context * fc)1674 static int set_meta_super(struct super_block *s, struct fs_context *fc)
1675 {
1676 return -EINVAL;
1677 }
1678
test_meta_super(struct super_block * s,struct fs_context * fc)1679 static int test_meta_super(struct super_block *s, struct fs_context *fc)
1680 {
1681 return (fc->sget_key == s->s_bdev);
1682 }
1683
gfs2_meta_get_tree(struct fs_context * fc)1684 static int gfs2_meta_get_tree(struct fs_context *fc)
1685 {
1686 struct super_block *s;
1687 struct gfs2_sbd *sdp;
1688 struct path path;
1689 int error;
1690
1691 if (!fc->source || !*fc->source)
1692 return -EINVAL;
1693
1694 error = kern_path(fc->source, LOOKUP_FOLLOW, &path);
1695 if (error) {
1696 pr_warn("path_lookup on %s returned error %d\n",
1697 fc->source, error);
1698 return error;
1699 }
1700 fc->fs_type = &gfs2_fs_type;
1701 fc->sget_key = path.dentry->d_sb->s_bdev;
1702 s = sget_fc(fc, test_meta_super, set_meta_super);
1703 path_put(&path);
1704 if (IS_ERR(s)) {
1705 pr_warn("gfs2 mount does not exist\n");
1706 return PTR_ERR(s);
1707 }
1708 if ((fc->sb_flags ^ s->s_flags) & SB_RDONLY) {
1709 deactivate_locked_super(s);
1710 return -EBUSY;
1711 }
1712 sdp = s->s_fs_info;
1713 fc->root = dget(sdp->sd_master_dir);
1714 return 0;
1715 }
1716
1717 static const struct fs_context_operations gfs2_meta_context_ops = {
1718 .free = gfs2_fc_free,
1719 .get_tree = gfs2_meta_get_tree,
1720 };
1721
gfs2_meta_init_fs_context(struct fs_context * fc)1722 static int gfs2_meta_init_fs_context(struct fs_context *fc)
1723 {
1724 int ret = gfs2_init_fs_context(fc);
1725
1726 if (ret)
1727 return ret;
1728
1729 fc->ops = &gfs2_meta_context_ops;
1730 return 0;
1731 }
1732
1733 /**
1734 * gfs2_evict_inodes - evict inodes cooperatively
1735 * @sb: the superblock
1736 *
1737 * When evicting an inode with a zero link count, we are trying to upgrade the
1738 * inode's iopen glock from SH to EX mode in order to determine if we can
1739 * delete the inode. The other nodes are supposed to evict the inode from
1740 * their caches if they can, and to poke the inode's inode glock if they cannot
1741 * do so. Either behavior allows gfs2_upgrade_iopen_glock() to proceed
1742 * quickly, but if the other nodes are not cooperating, the lock upgrading
1743 * attempt will time out. Since inodes are evicted sequentially, this can add
1744 * up quickly.
1745 *
1746 * Function evict_inodes() tries to keep the s_inode_list_lock list locked over
1747 * a long time, which prevents other inodes from being evicted concurrently.
1748 * This precludes the cooperative behavior we are looking for. This special
1749 * version of evict_inodes() avoids that.
1750 *
1751 * Modeled after drop_pagecache_sb().
1752 */
gfs2_evict_inodes(struct super_block * sb)1753 static void gfs2_evict_inodes(struct super_block *sb)
1754 {
1755 struct inode *inode, *toput_inode = NULL;
1756 struct gfs2_sbd *sdp = sb->s_fs_info;
1757
1758 set_bit(SDF_EVICTING, &sdp->sd_flags);
1759
1760 spin_lock(&sb->s_inode_list_lock);
1761 list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
1762 spin_lock(&inode->i_lock);
1763 if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) &&
1764 !need_resched()) {
1765 spin_unlock(&inode->i_lock);
1766 continue;
1767 }
1768 atomic_inc(&inode->i_count);
1769 spin_unlock(&inode->i_lock);
1770 spin_unlock(&sb->s_inode_list_lock);
1771
1772 iput(toput_inode);
1773 toput_inode = inode;
1774
1775 cond_resched();
1776 spin_lock(&sb->s_inode_list_lock);
1777 }
1778 spin_unlock(&sb->s_inode_list_lock);
1779 iput(toput_inode);
1780 }
1781
gfs2_kill_sb(struct super_block * sb)1782 static void gfs2_kill_sb(struct super_block *sb)
1783 {
1784 struct gfs2_sbd *sdp = sb->s_fs_info;
1785
1786 if (sdp == NULL) {
1787 kill_block_super(sb);
1788 return;
1789 }
1790
1791 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SYNC | GFS2_LFC_KILL_SB);
1792 dput(sdp->sd_root_dir);
1793 dput(sdp->sd_master_dir);
1794 sdp->sd_root_dir = NULL;
1795 sdp->sd_master_dir = NULL;
1796 shrink_dcache_sb(sb);
1797
1798 gfs2_evict_inodes(sb);
1799
1800 /*
1801 * Flush and then drain the delete workqueue here (via
1802 * destroy_workqueue()) to ensure that any delete work that
1803 * may be running will also see the SDF_KILL flag.
1804 */
1805 set_bit(SDF_KILL, &sdp->sd_flags);
1806 gfs2_flush_delete_work(sdp);
1807 destroy_workqueue(sdp->sd_delete_wq);
1808
1809 kill_block_super(sb);
1810 }
1811
1812 struct file_system_type gfs2_fs_type = {
1813 .name = "gfs2",
1814 .fs_flags = FS_REQUIRES_DEV,
1815 .init_fs_context = gfs2_init_fs_context,
1816 .parameters = gfs2_fs_parameters,
1817 .kill_sb = gfs2_kill_sb,
1818 .owner = THIS_MODULE,
1819 };
1820 MODULE_ALIAS_FS("gfs2");
1821
1822 struct file_system_type gfs2meta_fs_type = {
1823 .name = "gfs2meta",
1824 .fs_flags = FS_REQUIRES_DEV,
1825 .init_fs_context = gfs2_meta_init_fs_context,
1826 .owner = THIS_MODULE,
1827 };
1828 MODULE_ALIAS_FS("gfs2meta");
1829