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 INIT_LIST_HEAD(&sdp->sd_dead_glocks);
140
141 return sdp;
142
143 fail:
144 free_sbd(sdp);
145 return NULL;
146 }
147
148 /**
149 * gfs2_check_sb - Check superblock
150 * @sdp: the filesystem
151 * @silent: Don't print a message if the check fails
152 *
153 * Checks the version code of the FS is one that we understand how to
154 * read and that the sizes of the various on-disk structures have not
155 * changed.
156 */
157
gfs2_check_sb(struct gfs2_sbd * sdp,int silent)158 static int gfs2_check_sb(struct gfs2_sbd *sdp, int silent)
159 {
160 struct gfs2_sb_host *sb = &sdp->sd_sb;
161
162 if (sb->sb_magic != GFS2_MAGIC ||
163 sb->sb_type != GFS2_METATYPE_SB) {
164 if (!silent)
165 pr_warn("not a GFS2 filesystem\n");
166 return -EINVAL;
167 }
168
169 if (sb->sb_fs_format < GFS2_FS_FORMAT_MIN ||
170 sb->sb_fs_format > GFS2_FS_FORMAT_MAX ||
171 sb->sb_multihost_format != GFS2_FORMAT_MULTI) {
172 fs_warn(sdp, "Unknown on-disk format, unable to mount\n");
173 return -EINVAL;
174 }
175
176 if (sb->sb_bsize < 512 || sb->sb_bsize > PAGE_SIZE ||
177 (sb->sb_bsize & (sb->sb_bsize - 1))) {
178 pr_warn("Invalid block size\n");
179 return -EINVAL;
180 }
181 if (sb->sb_bsize_shift != ffs(sb->sb_bsize) - 1) {
182 pr_warn("Invalid block size shift\n");
183 return -EINVAL;
184 }
185 return 0;
186 }
187
end_bio_io_page(struct bio * bio)188 static void end_bio_io_page(struct bio *bio)
189 {
190 struct page *page = bio->bi_private;
191
192 if (!bio->bi_status)
193 SetPageUptodate(page);
194 else
195 pr_warn("error %d reading superblock\n", bio->bi_status);
196 unlock_page(page);
197 }
198
gfs2_sb_in(struct gfs2_sbd * sdp,const void * buf)199 static void gfs2_sb_in(struct gfs2_sbd *sdp, const void *buf)
200 {
201 struct gfs2_sb_host *sb = &sdp->sd_sb;
202 struct super_block *s = sdp->sd_vfs;
203 const struct gfs2_sb *str = buf;
204
205 sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic);
206 sb->sb_type = be32_to_cpu(str->sb_header.mh_type);
207 sb->sb_fs_format = be32_to_cpu(str->sb_fs_format);
208 sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format);
209 sb->sb_bsize = be32_to_cpu(str->sb_bsize);
210 sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift);
211 sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr);
212 sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino);
213 sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr);
214 sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino);
215
216 memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN);
217 memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN);
218 memcpy(&s->s_uuid, str->sb_uuid, 16);
219 }
220
221 /**
222 * gfs2_read_super - Read the gfs2 super block from disk
223 * @sdp: The GFS2 super block
224 * @sector: The location of the super block
225 * @silent: Don't print a message if the check fails
226 *
227 * This uses the bio functions to read the super block from disk
228 * because we want to be 100% sure that we never read cached data.
229 * A super block is read twice only during each GFS2 mount and is
230 * never written to by the filesystem. The first time its read no
231 * locks are held, and the only details which are looked at are those
232 * relating to the locking protocol. Once locking is up and working,
233 * the sb is read again under the lock to establish the location of
234 * the master directory (contains pointers to journals etc) and the
235 * root directory.
236 *
237 * Returns: 0 on success or error
238 */
239
gfs2_read_super(struct gfs2_sbd * sdp,sector_t sector,int silent)240 static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector, int silent)
241 {
242 struct super_block *sb = sdp->sd_vfs;
243 struct gfs2_sb *p;
244 struct page *page;
245 struct bio *bio;
246
247 page = alloc_page(GFP_NOFS);
248 if (unlikely(!page))
249 return -ENOMEM;
250
251 ClearPageUptodate(page);
252 ClearPageDirty(page);
253 lock_page(page);
254
255 bio = bio_alloc(sb->s_bdev, 1, REQ_OP_READ | REQ_META, GFP_NOFS);
256 bio->bi_iter.bi_sector = sector * (sb->s_blocksize >> 9);
257 __bio_add_page(bio, page, PAGE_SIZE, 0);
258
259 bio->bi_end_io = end_bio_io_page;
260 bio->bi_private = page;
261 submit_bio(bio);
262 wait_on_page_locked(page);
263 bio_put(bio);
264 if (!PageUptodate(page)) {
265 __free_page(page);
266 return -EIO;
267 }
268 p = kmap(page);
269 gfs2_sb_in(sdp, p);
270 kunmap(page);
271 __free_page(page);
272 return gfs2_check_sb(sdp, silent);
273 }
274
275 /**
276 * gfs2_read_sb - Read super block
277 * @sdp: The GFS2 superblock
278 * @silent: Don't print message if mount fails
279 *
280 */
281
gfs2_read_sb(struct gfs2_sbd * sdp,int silent)282 static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent)
283 {
284 u32 hash_blocks, ind_blocks, leaf_blocks;
285 u32 tmp_blocks;
286 unsigned int x;
287 int error;
288
289 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
290 if (error) {
291 if (!silent)
292 fs_err(sdp, "can't read superblock\n");
293 return error;
294 }
295
296 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
297 GFS2_BASIC_BLOCK_SHIFT;
298 sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift);
299 sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
300 sizeof(struct gfs2_dinode)) / sizeof(u64);
301 sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
302 sizeof(struct gfs2_meta_header)) / sizeof(u64);
303 sdp->sd_ldptrs = (sdp->sd_sb.sb_bsize -
304 sizeof(struct gfs2_log_descriptor)) / sizeof(u64);
305 sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
306 sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
307 sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
308 sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64);
309 sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
310 sizeof(struct gfs2_meta_header)) /
311 sizeof(struct gfs2_quota_change);
312 sdp->sd_blocks_per_bitmap = (sdp->sd_sb.sb_bsize -
313 sizeof(struct gfs2_meta_header))
314 * GFS2_NBBY; /* not the rgrp bitmap, subsequent bitmaps only */
315
316 /*
317 * We always keep at least one block reserved for revokes in
318 * transactions. This greatly simplifies allocating additional
319 * revoke blocks.
320 */
321 atomic_set(&sdp->sd_log_revokes_available, sdp->sd_ldptrs);
322
323 /* Compute maximum reservation required to add a entry to a directory */
324
325 hash_blocks = DIV_ROUND_UP(sizeof(u64) * BIT(GFS2_DIR_MAX_DEPTH),
326 sdp->sd_jbsize);
327
328 ind_blocks = 0;
329 for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
330 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
331 ind_blocks += tmp_blocks;
332 }
333
334 leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
335
336 sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
337
338 sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
339 sizeof(struct gfs2_dinode);
340 sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
341 for (x = 2;; x++) {
342 u64 space, d;
343 u32 m;
344
345 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
346 d = space;
347 m = do_div(d, sdp->sd_inptrs);
348
349 if (d != sdp->sd_heightsize[x - 1] || m)
350 break;
351 sdp->sd_heightsize[x] = space;
352 }
353 sdp->sd_max_height = x;
354 sdp->sd_heightsize[x] = ~0;
355 gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
356
357 sdp->sd_max_dents_per_leaf = (sdp->sd_sb.sb_bsize -
358 sizeof(struct gfs2_leaf)) /
359 GFS2_MIN_DIRENT_SIZE;
360 return 0;
361 }
362
init_names(struct gfs2_sbd * sdp,int silent)363 static int init_names(struct gfs2_sbd *sdp, int silent)
364 {
365 char *proto, *table;
366 int error = 0;
367
368 proto = sdp->sd_args.ar_lockproto;
369 table = sdp->sd_args.ar_locktable;
370
371 /* Try to autodetect */
372
373 if (!proto[0] || !table[0]) {
374 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
375 if (error)
376 return error;
377
378 if (!proto[0])
379 proto = sdp->sd_sb.sb_lockproto;
380 if (!table[0])
381 table = sdp->sd_sb.sb_locktable;
382 }
383
384 if (!table[0])
385 table = sdp->sd_vfs->s_id;
386
387 BUILD_BUG_ON(GFS2_LOCKNAME_LEN > GFS2_FSNAME_LEN);
388
389 strscpy(sdp->sd_proto_name, proto, GFS2_LOCKNAME_LEN);
390 strscpy(sdp->sd_table_name, table, GFS2_LOCKNAME_LEN);
391
392 table = sdp->sd_table_name;
393 while ((table = strchr(table, '/')))
394 *table = '_';
395
396 return error;
397 }
398
init_locking(struct gfs2_sbd * sdp,struct gfs2_holder * mount_gh,int undo)399 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
400 int undo)
401 {
402 int error = 0;
403
404 if (undo)
405 goto fail_trans;
406
407 error = gfs2_glock_nq_num(sdp,
408 GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
409 LM_ST_EXCLUSIVE,
410 LM_FLAG_NOEXP | GL_NOCACHE | GL_NOPID,
411 mount_gh);
412 if (error) {
413 fs_err(sdp, "can't acquire mount glock: %d\n", error);
414 goto fail;
415 }
416
417 error = gfs2_glock_nq_num(sdp,
418 GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
419 LM_ST_SHARED,
420 LM_FLAG_NOEXP | GL_EXACT | GL_NOPID,
421 &sdp->sd_live_gh);
422 if (error) {
423 fs_err(sdp, "can't acquire live glock: %d\n", error);
424 goto fail_mount;
425 }
426
427 error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
428 CREATE, &sdp->sd_rename_gl);
429 if (error) {
430 fs_err(sdp, "can't create rename glock: %d\n", error);
431 goto fail_live;
432 }
433
434 error = gfs2_glock_get(sdp, GFS2_FREEZE_LOCK, &gfs2_freeze_glops,
435 CREATE, &sdp->sd_freeze_gl);
436 if (error) {
437 fs_err(sdp, "can't create freeze glock: %d\n", error);
438 goto fail_rename;
439 }
440
441 return 0;
442
443 fail_trans:
444 gfs2_glock_put(sdp->sd_freeze_gl);
445 fail_rename:
446 gfs2_glock_put(sdp->sd_rename_gl);
447 fail_live:
448 gfs2_glock_dq_uninit(&sdp->sd_live_gh);
449 fail_mount:
450 gfs2_glock_dq_uninit(mount_gh);
451 fail:
452 return error;
453 }
454
gfs2_lookup_root(struct super_block * sb,struct dentry ** dptr,u64 no_addr,const char * name)455 static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr,
456 u64 no_addr, const char *name)
457 {
458 struct gfs2_sbd *sdp = sb->s_fs_info;
459 struct dentry *dentry;
460 struct inode *inode;
461
462 inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0,
463 GFS2_BLKST_FREE /* ignore */);
464 if (IS_ERR(inode)) {
465 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode));
466 return PTR_ERR(inode);
467 }
468 dentry = d_make_root(inode);
469 if (!dentry) {
470 fs_err(sdp, "can't alloc %s dentry\n", name);
471 return -ENOMEM;
472 }
473 *dptr = dentry;
474 return 0;
475 }
476
init_sb(struct gfs2_sbd * sdp,int silent)477 static int init_sb(struct gfs2_sbd *sdp, int silent)
478 {
479 struct super_block *sb = sdp->sd_vfs;
480 struct gfs2_holder sb_gh;
481 u64 no_addr;
482 int ret;
483
484 ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
485 LM_ST_SHARED, 0, &sb_gh);
486 if (ret) {
487 fs_err(sdp, "can't acquire superblock glock: %d\n", ret);
488 return ret;
489 }
490
491 ret = gfs2_read_sb(sdp, silent);
492 if (ret) {
493 fs_err(sdp, "can't read superblock: %d\n", ret);
494 goto out;
495 }
496
497 switch(sdp->sd_sb.sb_fs_format) {
498 case GFS2_FS_FORMAT_MAX:
499 sb->s_xattr = gfs2_xattr_handlers_max;
500 break;
501
502 case GFS2_FS_FORMAT_MIN:
503 sb->s_xattr = gfs2_xattr_handlers_min;
504 break;
505
506 default:
507 BUG();
508 }
509
510 /* Set up the buffer cache and SB for real */
511 if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) {
512 ret = -EINVAL;
513 fs_err(sdp, "FS block size (%u) is too small for device "
514 "block size (%u)\n",
515 sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev));
516 goto out;
517 }
518 if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
519 ret = -EINVAL;
520 fs_err(sdp, "FS block size (%u) is too big for machine "
521 "page size (%u)\n",
522 sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
523 goto out;
524 }
525 sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
526
527 /* Get the root inode */
528 no_addr = sdp->sd_sb.sb_root_dir.no_addr;
529 ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root");
530 if (ret)
531 goto out;
532
533 /* Get the master inode */
534 no_addr = sdp->sd_sb.sb_master_dir.no_addr;
535 ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master");
536 if (ret) {
537 dput(sdp->sd_root_dir);
538 goto out;
539 }
540 sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir);
541 out:
542 gfs2_glock_dq_uninit(&sb_gh);
543 return ret;
544 }
545
gfs2_others_may_mount(struct gfs2_sbd * sdp)546 static void gfs2_others_may_mount(struct gfs2_sbd *sdp)
547 {
548 char *message = "FIRSTMOUNT=Done";
549 char *envp[] = { message, NULL };
550
551 fs_info(sdp, "first mount done, others may mount\n");
552
553 if (sdp->sd_lockstruct.ls_ops->lm_first_done)
554 sdp->sd_lockstruct.ls_ops->lm_first_done(sdp);
555
556 kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp);
557 }
558
559 /**
560 * gfs2_jindex_hold - Grab a lock on the jindex
561 * @sdp: The GFS2 superblock
562 * @ji_gh: the holder for the jindex glock
563 *
564 * Returns: errno
565 */
566
gfs2_jindex_hold(struct gfs2_sbd * sdp,struct gfs2_holder * ji_gh)567 static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
568 {
569 struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex);
570 struct qstr name;
571 char buf[20];
572 struct gfs2_jdesc *jd;
573 int error;
574
575 name.name = buf;
576
577 mutex_lock(&sdp->sd_jindex_mutex);
578
579 for (;;) {
580 struct gfs2_inode *jip;
581
582 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh);
583 if (error)
584 break;
585
586 name.len = sprintf(buf, "journal%u", sdp->sd_journals);
587 name.hash = gfs2_disk_hash(name.name, name.len);
588
589 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL);
590 if (error == -ENOENT) {
591 error = 0;
592 break;
593 }
594
595 gfs2_glock_dq_uninit(ji_gh);
596
597 if (error)
598 break;
599
600 error = -ENOMEM;
601 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
602 if (!jd)
603 break;
604
605 INIT_LIST_HEAD(&jd->extent_list);
606 INIT_LIST_HEAD(&jd->jd_revoke_list);
607
608 INIT_WORK(&jd->jd_work, gfs2_recover_func);
609 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1);
610 if (IS_ERR_OR_NULL(jd->jd_inode)) {
611 if (!jd->jd_inode)
612 error = -ENOENT;
613 else
614 error = PTR_ERR(jd->jd_inode);
615 kfree(jd);
616 break;
617 }
618
619 d_mark_dontcache(jd->jd_inode);
620 spin_lock(&sdp->sd_jindex_spin);
621 jd->jd_jid = sdp->sd_journals++;
622 jip = GFS2_I(jd->jd_inode);
623 jd->jd_no_addr = jip->i_no_addr;
624 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
625 spin_unlock(&sdp->sd_jindex_spin);
626 }
627
628 mutex_unlock(&sdp->sd_jindex_mutex);
629
630 return error;
631 }
632
633 /**
634 * init_statfs - look up and initialize master and local (per node) statfs inodes
635 * @sdp: The GFS2 superblock
636 *
637 * This should be called after the jindex is initialized in init_journal() and
638 * before gfs2_journal_recovery() is called because we need to be able to write
639 * to these inodes during recovery.
640 *
641 * Returns: errno
642 */
init_statfs(struct gfs2_sbd * sdp)643 static int init_statfs(struct gfs2_sbd *sdp)
644 {
645 int error = 0;
646 struct inode *master = d_inode(sdp->sd_master_dir);
647 struct inode *pn = NULL;
648 char buf[30];
649 struct gfs2_jdesc *jd;
650 struct gfs2_inode *ip;
651
652 sdp->sd_statfs_inode = gfs2_lookup_meta(master, "statfs");
653 if (IS_ERR(sdp->sd_statfs_inode)) {
654 error = PTR_ERR(sdp->sd_statfs_inode);
655 fs_err(sdp, "can't read in statfs inode: %d\n", error);
656 goto out;
657 }
658 if (sdp->sd_args.ar_spectator)
659 goto out;
660
661 pn = gfs2_lookup_meta(master, "per_node");
662 if (IS_ERR(pn)) {
663 error = PTR_ERR(pn);
664 fs_err(sdp, "can't find per_node directory: %d\n", error);
665 goto put_statfs;
666 }
667
668 /* For each jid, lookup the corresponding local statfs inode in the
669 * per_node metafs directory and save it in the sdp->sd_sc_inodes_list. */
670 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
671 struct local_statfs_inode *lsi =
672 kmalloc(sizeof(struct local_statfs_inode), GFP_NOFS);
673 if (!lsi) {
674 error = -ENOMEM;
675 goto free_local;
676 }
677 sprintf(buf, "statfs_change%u", jd->jd_jid);
678 lsi->si_sc_inode = gfs2_lookup_meta(pn, buf);
679 if (IS_ERR(lsi->si_sc_inode)) {
680 error = PTR_ERR(lsi->si_sc_inode);
681 fs_err(sdp, "can't find local \"sc\" file#%u: %d\n",
682 jd->jd_jid, error);
683 kfree(lsi);
684 goto free_local;
685 }
686 lsi->si_jid = jd->jd_jid;
687 if (jd->jd_jid == sdp->sd_jdesc->jd_jid)
688 sdp->sd_sc_inode = lsi->si_sc_inode;
689
690 list_add_tail(&lsi->si_list, &sdp->sd_sc_inodes_list);
691 }
692
693 iput(pn);
694 pn = NULL;
695 ip = GFS2_I(sdp->sd_sc_inode);
696 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_NOPID,
697 &sdp->sd_sc_gh);
698 if (error) {
699 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
700 goto free_local;
701 }
702 /* read in the local statfs buffer - other nodes don't change it. */
703 error = gfs2_meta_inode_buffer(ip, &sdp->sd_sc_bh);
704 if (error) {
705 fs_err(sdp, "Cannot read in local statfs: %d\n", error);
706 goto unlock_sd_gh;
707 }
708 return 0;
709
710 unlock_sd_gh:
711 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
712 free_local:
713 free_local_statfs_inodes(sdp);
714 iput(pn);
715 put_statfs:
716 iput(sdp->sd_statfs_inode);
717 out:
718 return error;
719 }
720
721 /* Uninitialize and free up memory used by the list of statfs inodes */
uninit_statfs(struct gfs2_sbd * sdp)722 static void uninit_statfs(struct gfs2_sbd *sdp)
723 {
724 if (!sdp->sd_args.ar_spectator) {
725 brelse(sdp->sd_sc_bh);
726 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
727 free_local_statfs_inodes(sdp);
728 }
729 iput(sdp->sd_statfs_inode);
730 }
731
init_journal(struct gfs2_sbd * sdp,int undo)732 static int init_journal(struct gfs2_sbd *sdp, int undo)
733 {
734 struct inode *master = d_inode(sdp->sd_master_dir);
735 struct gfs2_holder ji_gh;
736 struct gfs2_inode *ip;
737 int error = 0;
738
739 gfs2_holder_mark_uninitialized(&ji_gh);
740 if (undo)
741 goto fail_statfs;
742
743 sdp->sd_jindex = gfs2_lookup_meta(master, "jindex");
744 if (IS_ERR(sdp->sd_jindex)) {
745 fs_err(sdp, "can't lookup journal index: %d\n", error);
746 return PTR_ERR(sdp->sd_jindex);
747 }
748
749 /* Load in the journal index special file */
750
751 error = gfs2_jindex_hold(sdp, &ji_gh);
752 if (error) {
753 fs_err(sdp, "can't read journal index: %d\n", error);
754 goto fail;
755 }
756
757 error = -EUSERS;
758 if (!gfs2_jindex_size(sdp)) {
759 fs_err(sdp, "no journals!\n");
760 goto fail_jindex;
761 }
762
763 atomic_set(&sdp->sd_log_blks_needed, 0);
764 if (sdp->sd_args.ar_spectator) {
765 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
766 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
767 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
768 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
769 } else {
770 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
771 fs_err(sdp, "can't mount journal #%u\n",
772 sdp->sd_lockstruct.ls_jid);
773 fs_err(sdp, "there are only %u journals (0 - %u)\n",
774 gfs2_jindex_size(sdp),
775 gfs2_jindex_size(sdp) - 1);
776 goto fail_jindex;
777 }
778 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
779
780 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
781 &gfs2_journal_glops,
782 LM_ST_EXCLUSIVE,
783 LM_FLAG_NOEXP | GL_NOCACHE | GL_NOPID,
784 &sdp->sd_journal_gh);
785 if (error) {
786 fs_err(sdp, "can't acquire journal glock: %d\n", error);
787 goto fail_jindex;
788 }
789
790 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
791 sdp->sd_jinode_gl = ip->i_gl;
792 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
793 LM_FLAG_NOEXP | GL_EXACT |
794 GL_NOCACHE | GL_NOPID,
795 &sdp->sd_jinode_gh);
796 if (error) {
797 fs_err(sdp, "can't acquire journal inode glock: %d\n",
798 error);
799 goto fail_journal_gh;
800 }
801
802 error = gfs2_jdesc_check(sdp->sd_jdesc);
803 if (error) {
804 fs_err(sdp, "my journal (%u) is bad: %d\n",
805 sdp->sd_jdesc->jd_jid, error);
806 goto fail_jinode_gh;
807 }
808 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
809 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
810 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
811
812 /* Map the extents for this journal's blocks */
813 gfs2_map_journal_extents(sdp, sdp->sd_jdesc);
814 }
815 trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free));
816
817 /* Lookup statfs inodes here so journal recovery can use them. */
818 error = init_statfs(sdp);
819 if (error)
820 goto fail_jinode_gh;
821
822 if (sdp->sd_lockstruct.ls_first) {
823 unsigned int x;
824 for (x = 0; x < sdp->sd_journals; x++) {
825 struct gfs2_jdesc *jd = gfs2_jdesc_find(sdp, x);
826
827 if (sdp->sd_args.ar_spectator) {
828 error = check_journal_clean(sdp, jd, true);
829 if (error)
830 goto fail_statfs;
831 continue;
832 }
833 error = gfs2_recover_journal(jd, true);
834 if (error) {
835 fs_err(sdp, "error recovering journal %u: %d\n",
836 x, error);
837 goto fail_statfs;
838 }
839 }
840
841 gfs2_others_may_mount(sdp);
842 } else if (!sdp->sd_args.ar_spectator) {
843 error = gfs2_recover_journal(sdp->sd_jdesc, true);
844 if (error) {
845 fs_err(sdp, "error recovering my journal: %d\n", error);
846 goto fail_statfs;
847 }
848 }
849
850 sdp->sd_log_idle = 1;
851 set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
852 gfs2_glock_dq_uninit(&ji_gh);
853 INIT_WORK(&sdp->sd_freeze_work, gfs2_freeze_func);
854 return 0;
855
856 fail_statfs:
857 uninit_statfs(sdp);
858 fail_jinode_gh:
859 /* A withdraw may have done dq/uninit so now we need to check it */
860 if (!sdp->sd_args.ar_spectator &&
861 gfs2_holder_initialized(&sdp->sd_jinode_gh))
862 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
863 fail_journal_gh:
864 if (!sdp->sd_args.ar_spectator &&
865 gfs2_holder_initialized(&sdp->sd_journal_gh))
866 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
867 fail_jindex:
868 gfs2_jindex_free(sdp);
869 if (gfs2_holder_initialized(&ji_gh))
870 gfs2_glock_dq_uninit(&ji_gh);
871 fail:
872 iput(sdp->sd_jindex);
873 return error;
874 }
875
876 static struct lock_class_key gfs2_quota_imutex_key;
877
init_inodes(struct gfs2_sbd * sdp,int undo)878 static int init_inodes(struct gfs2_sbd *sdp, int undo)
879 {
880 int error = 0;
881 struct inode *master = d_inode(sdp->sd_master_dir);
882
883 if (undo)
884 goto fail_qinode;
885
886 error = init_journal(sdp, undo);
887 complete_all(&sdp->sd_journal_ready);
888 if (error)
889 goto fail;
890
891 /* Read in the resource index inode */
892 sdp->sd_rindex = gfs2_lookup_meta(master, "rindex");
893 if (IS_ERR(sdp->sd_rindex)) {
894 error = PTR_ERR(sdp->sd_rindex);
895 fs_err(sdp, "can't get resource index inode: %d\n", error);
896 goto fail_journal;
897 }
898 sdp->sd_rindex_uptodate = 0;
899
900 /* Read in the quota inode */
901 sdp->sd_quota_inode = gfs2_lookup_meta(master, "quota");
902 if (IS_ERR(sdp->sd_quota_inode)) {
903 error = PTR_ERR(sdp->sd_quota_inode);
904 fs_err(sdp, "can't get quota file inode: %d\n", error);
905 goto fail_rindex;
906 }
907 /*
908 * i_rwsem on quota files is special. Since this inode is hidden system
909 * file, we are safe to define locking ourselves.
910 */
911 lockdep_set_class(&sdp->sd_quota_inode->i_rwsem,
912 &gfs2_quota_imutex_key);
913
914 error = gfs2_rindex_update(sdp);
915 if (error)
916 goto fail_qinode;
917
918 return 0;
919
920 fail_qinode:
921 iput(sdp->sd_quota_inode);
922 fail_rindex:
923 gfs2_clear_rgrpd(sdp);
924 iput(sdp->sd_rindex);
925 fail_journal:
926 init_journal(sdp, UNDO);
927 fail:
928 return error;
929 }
930
init_per_node(struct gfs2_sbd * sdp,int undo)931 static int init_per_node(struct gfs2_sbd *sdp, int undo)
932 {
933 struct inode *pn = NULL;
934 char buf[30];
935 int error = 0;
936 struct gfs2_inode *ip;
937 struct inode *master = d_inode(sdp->sd_master_dir);
938
939 if (sdp->sd_args.ar_spectator)
940 return 0;
941
942 if (undo)
943 goto fail_qc_gh;
944
945 pn = gfs2_lookup_meta(master, "per_node");
946 if (IS_ERR(pn)) {
947 error = PTR_ERR(pn);
948 fs_err(sdp, "can't find per_node directory: %d\n", error);
949 return error;
950 }
951
952 sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
953 sdp->sd_qc_inode = gfs2_lookup_meta(pn, buf);
954 if (IS_ERR(sdp->sd_qc_inode)) {
955 error = PTR_ERR(sdp->sd_qc_inode);
956 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
957 goto fail_ut_i;
958 }
959
960 iput(pn);
961 pn = NULL;
962
963 ip = GFS2_I(sdp->sd_qc_inode);
964 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_NOPID,
965 &sdp->sd_qc_gh);
966 if (error) {
967 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
968 goto fail_qc_i;
969 }
970
971 return 0;
972
973 fail_qc_gh:
974 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
975 fail_qc_i:
976 iput(sdp->sd_qc_inode);
977 fail_ut_i:
978 iput(pn);
979 return error;
980 }
981
982 static const match_table_t nolock_tokens = {
983 { Opt_jid, "jid=%d", },
984 { Opt_err, NULL },
985 };
986
987 static const struct lm_lockops nolock_ops = {
988 .lm_proto_name = "lock_nolock",
989 .lm_put_lock = gfs2_glock_free,
990 .lm_tokens = &nolock_tokens,
991 };
992
993 /**
994 * gfs2_lm_mount - mount a locking protocol
995 * @sdp: the filesystem
996 * @silent: if 1, don't complain if the FS isn't a GFS2 fs
997 *
998 * Returns: errno
999 */
1000
gfs2_lm_mount(struct gfs2_sbd * sdp,int silent)1001 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
1002 {
1003 const struct lm_lockops *lm;
1004 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
1005 struct gfs2_args *args = &sdp->sd_args;
1006 const char *proto = sdp->sd_proto_name;
1007 const char *table = sdp->sd_table_name;
1008 char *o, *options;
1009 int ret;
1010
1011 if (!strcmp("lock_nolock", proto)) {
1012 lm = &nolock_ops;
1013 sdp->sd_args.ar_localflocks = 1;
1014 #ifdef CONFIG_GFS2_FS_LOCKING_DLM
1015 } else if (!strcmp("lock_dlm", proto)) {
1016 lm = &gfs2_dlm_ops;
1017 #endif
1018 } else {
1019 pr_info("can't find protocol %s\n", proto);
1020 return -ENOENT;
1021 }
1022
1023 fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);
1024
1025 ls->ls_ops = lm;
1026 ls->ls_first = 1;
1027
1028 for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) {
1029 substring_t tmp[MAX_OPT_ARGS];
1030 int token, option;
1031
1032 if (!o || !*o)
1033 continue;
1034
1035 token = match_token(o, *lm->lm_tokens, tmp);
1036 switch (token) {
1037 case Opt_jid:
1038 ret = match_int(&tmp[0], &option);
1039 if (ret || option < 0)
1040 goto hostdata_error;
1041 if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags))
1042 ls->ls_jid = option;
1043 break;
1044 case Opt_id:
1045 case Opt_nodir:
1046 /* Obsolete, but left for backward compat purposes */
1047 break;
1048 case Opt_first:
1049 ret = match_int(&tmp[0], &option);
1050 if (ret || (option != 0 && option != 1))
1051 goto hostdata_error;
1052 ls->ls_first = option;
1053 break;
1054 case Opt_err:
1055 default:
1056 hostdata_error:
1057 fs_info(sdp, "unknown hostdata (%s)\n", o);
1058 return -EINVAL;
1059 }
1060 }
1061
1062 if (lm->lm_mount == NULL) {
1063 fs_info(sdp, "Now mounting FS (format %u)...\n", sdp->sd_sb.sb_fs_format);
1064 complete_all(&sdp->sd_locking_init);
1065 return 0;
1066 }
1067 ret = lm->lm_mount(sdp, table);
1068 if (ret == 0)
1069 fs_info(sdp, "Joined cluster. Now mounting FS (format %u)...\n",
1070 sdp->sd_sb.sb_fs_format);
1071 complete_all(&sdp->sd_locking_init);
1072 return ret;
1073 }
1074
gfs2_lm_unmount(struct gfs2_sbd * sdp)1075 void gfs2_lm_unmount(struct gfs2_sbd *sdp)
1076 {
1077 const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops;
1078 if (!gfs2_withdrawing_or_withdrawn(sdp) && lm->lm_unmount)
1079 lm->lm_unmount(sdp);
1080 }
1081
wait_on_journal(struct gfs2_sbd * sdp)1082 static int wait_on_journal(struct gfs2_sbd *sdp)
1083 {
1084 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
1085 return 0;
1086
1087 return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, TASK_INTERRUPTIBLE)
1088 ? -EINTR : 0;
1089 }
1090
gfs2_online_uevent(struct gfs2_sbd * sdp)1091 void gfs2_online_uevent(struct gfs2_sbd *sdp)
1092 {
1093 struct super_block *sb = sdp->sd_vfs;
1094 char ro[20];
1095 char spectator[20];
1096 char *envp[] = { ro, spectator, NULL };
1097 sprintf(ro, "RDONLY=%d", sb_rdonly(sb));
1098 sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
1099 kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp);
1100 }
1101
init_threads(struct gfs2_sbd * sdp)1102 static int init_threads(struct gfs2_sbd *sdp)
1103 {
1104 struct task_struct *p;
1105 int error = 0;
1106
1107 p = kthread_create(gfs2_logd, sdp, "gfs2_logd/%s", sdp->sd_fsname);
1108 if (IS_ERR(p)) {
1109 error = PTR_ERR(p);
1110 fs_err(sdp, "can't create logd thread: %d\n", error);
1111 return error;
1112 }
1113 get_task_struct(p);
1114 sdp->sd_logd_process = p;
1115
1116 p = kthread_create(gfs2_quotad, sdp, "gfs2_quotad/%s", sdp->sd_fsname);
1117 if (IS_ERR(p)) {
1118 error = PTR_ERR(p);
1119 fs_err(sdp, "can't create quotad thread: %d\n", error);
1120 goto fail;
1121 }
1122 get_task_struct(p);
1123 sdp->sd_quotad_process = p;
1124
1125 wake_up_process(sdp->sd_logd_process);
1126 wake_up_process(sdp->sd_quotad_process);
1127 return 0;
1128
1129 fail:
1130 kthread_stop_put(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_put(sdp->sd_logd_process);
1139 sdp->sd_logd_process = NULL;
1140 }
1141 if (sdp->sd_quotad_process) {
1142 kthread_stop_put(sdp->sd_quotad_process);
1143 sdp->sd_quotad_process = NULL;
1144 }
1145 }
1146
1147 /**
1148 * gfs2_fill_super - Read in superblock
1149 * @sb: The VFS superblock
1150 * @fc: Mount options and flags
1151 *
1152 * Returns: -errno
1153 */
gfs2_fill_super(struct super_block * sb,struct fs_context * fc)1154 static int gfs2_fill_super(struct super_block *sb, struct fs_context *fc)
1155 {
1156 struct gfs2_args *args = fc->fs_private;
1157 int silent = fc->sb_flags & SB_SILENT;
1158 struct gfs2_sbd *sdp;
1159 struct gfs2_holder mount_gh;
1160 int error;
1161
1162 sdp = init_sbd(sb);
1163 if (!sdp) {
1164 pr_warn("can't alloc struct gfs2_sbd\n");
1165 return -ENOMEM;
1166 }
1167 sdp->sd_args = *args;
1168
1169 if (sdp->sd_args.ar_spectator) {
1170 sb->s_flags |= SB_RDONLY;
1171 set_bit(SDF_RORECOVERY, &sdp->sd_flags);
1172 }
1173 if (sdp->sd_args.ar_posix_acl)
1174 sb->s_flags |= SB_POSIXACL;
1175 if (sdp->sd_args.ar_nobarrier)
1176 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1177
1178 sb->s_flags |= SB_NOSEC;
1179 sb->s_magic = GFS2_MAGIC;
1180 sb->s_op = &gfs2_super_ops;
1181 sb->s_d_op = &gfs2_dops;
1182 sb->s_export_op = &gfs2_export_ops;
1183 sb->s_qcop = &gfs2_quotactl_ops;
1184 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1185 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
1186 sb->s_time_gran = 1;
1187 sb->s_maxbytes = MAX_LFS_FILESIZE;
1188
1189 /* Set up the buffer cache and fill in some fake block size values
1190 to allow us to read-in the on-disk superblock. */
1191 sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
1192 sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
1193 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
1194 GFS2_BASIC_BLOCK_SHIFT;
1195 sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift);
1196
1197 sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit;
1198 sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum;
1199 if (sdp->sd_args.ar_statfs_quantum) {
1200 sdp->sd_tune.gt_statfs_slow = 0;
1201 sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum;
1202 } else {
1203 sdp->sd_tune.gt_statfs_slow = 1;
1204 sdp->sd_tune.gt_statfs_quantum = 30;
1205 }
1206
1207 error = init_names(sdp, silent);
1208 if (error)
1209 goto fail_free;
1210
1211 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s", sdp->sd_table_name);
1212
1213 sdp->sd_delete_wq = alloc_workqueue("gfs2-delete/%s",
1214 WQ_MEM_RECLAIM | WQ_FREEZABLE, 0, sdp->sd_fsname);
1215 error = -ENOMEM;
1216 if (!sdp->sd_delete_wq)
1217 goto fail_free;
1218
1219 error = gfs2_sys_fs_add(sdp);
1220 if (error)
1221 goto fail_delete_wq;
1222
1223 gfs2_create_debugfs_file(sdp);
1224
1225 error = gfs2_lm_mount(sdp, silent);
1226 if (error)
1227 goto fail_debug;
1228
1229 error = init_locking(sdp, &mount_gh, DO);
1230 if (error)
1231 goto fail_lm;
1232
1233 error = init_sb(sdp, silent);
1234 if (error)
1235 goto fail_locking;
1236
1237 /* Turn rgrplvb on by default if fs format is recent enough */
1238 if (!sdp->sd_args.ar_got_rgrplvb && sdp->sd_sb.sb_fs_format > 1801)
1239 sdp->sd_args.ar_rgrplvb = 1;
1240
1241 error = wait_on_journal(sdp);
1242 if (error)
1243 goto fail_sb;
1244
1245 /*
1246 * If user space has failed to join the cluster or some similar
1247 * failure has occurred, then the journal id will contain a
1248 * negative (error) number. This will then be returned to the
1249 * caller (of the mount syscall). We do this even for spectator
1250 * mounts (which just write a jid of 0 to indicate "ok" even though
1251 * the jid is unused in the spectator case)
1252 */
1253 if (sdp->sd_lockstruct.ls_jid < 0) {
1254 error = sdp->sd_lockstruct.ls_jid;
1255 sdp->sd_lockstruct.ls_jid = 0;
1256 goto fail_sb;
1257 }
1258
1259 if (sdp->sd_args.ar_spectator)
1260 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.s",
1261 sdp->sd_table_name);
1262 else
1263 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.%u",
1264 sdp->sd_table_name, sdp->sd_lockstruct.ls_jid);
1265
1266 error = init_inodes(sdp, DO);
1267 if (error)
1268 goto fail_sb;
1269
1270 error = init_per_node(sdp, DO);
1271 if (error)
1272 goto fail_inodes;
1273
1274 error = gfs2_statfs_init(sdp);
1275 if (error) {
1276 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
1277 goto fail_per_node;
1278 }
1279
1280 if (!sb_rdonly(sb)) {
1281 error = init_threads(sdp);
1282 if (error)
1283 goto fail_per_node;
1284 }
1285
1286 error = gfs2_freeze_lock_shared(sdp);
1287 if (error)
1288 goto fail_per_node;
1289
1290 if (!sb_rdonly(sb))
1291 error = gfs2_make_fs_rw(sdp);
1292
1293 if (error) {
1294 gfs2_freeze_unlock(&sdp->sd_freeze_gh);
1295 gfs2_destroy_threads(sdp);
1296 fs_err(sdp, "can't make FS RW: %d\n", error);
1297 goto fail_per_node;
1298 }
1299 gfs2_glock_dq_uninit(&mount_gh);
1300 gfs2_online_uevent(sdp);
1301 return 0;
1302
1303 fail_per_node:
1304 init_per_node(sdp, UNDO);
1305 fail_inodes:
1306 init_inodes(sdp, UNDO);
1307 fail_sb:
1308 if (sdp->sd_root_dir)
1309 dput(sdp->sd_root_dir);
1310 if (sdp->sd_master_dir)
1311 dput(sdp->sd_master_dir);
1312 if (sb->s_root)
1313 dput(sb->s_root);
1314 sb->s_root = NULL;
1315 fail_locking:
1316 init_locking(sdp, &mount_gh, UNDO);
1317 fail_lm:
1318 complete_all(&sdp->sd_journal_ready);
1319 gfs2_gl_hash_clear(sdp);
1320 gfs2_lm_unmount(sdp);
1321 fail_debug:
1322 gfs2_delete_debugfs_file(sdp);
1323 gfs2_sys_fs_del(sdp);
1324 fail_delete_wq:
1325 destroy_workqueue(sdp->sd_delete_wq);
1326 fail_free:
1327 free_sbd(sdp);
1328 sb->s_fs_info = NULL;
1329 return error;
1330 }
1331
1332 /**
1333 * gfs2_get_tree - Get the GFS2 superblock and root directory
1334 * @fc: The filesystem context
1335 *
1336 * Returns: 0 or -errno on error
1337 */
gfs2_get_tree(struct fs_context * fc)1338 static int gfs2_get_tree(struct fs_context *fc)
1339 {
1340 struct gfs2_args *args = fc->fs_private;
1341 struct gfs2_sbd *sdp;
1342 int error;
1343
1344 error = get_tree_bdev(fc, gfs2_fill_super);
1345 if (error)
1346 return error;
1347
1348 sdp = fc->root->d_sb->s_fs_info;
1349 dput(fc->root);
1350 if (args->ar_meta)
1351 fc->root = dget(sdp->sd_master_dir);
1352 else
1353 fc->root = dget(sdp->sd_root_dir);
1354 return 0;
1355 }
1356
gfs2_fc_free(struct fs_context * fc)1357 static void gfs2_fc_free(struct fs_context *fc)
1358 {
1359 struct gfs2_args *args = fc->fs_private;
1360
1361 kfree(args);
1362 }
1363
1364 enum gfs2_param {
1365 Opt_lockproto,
1366 Opt_locktable,
1367 Opt_hostdata,
1368 Opt_spectator,
1369 Opt_ignore_local_fs,
1370 Opt_localflocks,
1371 Opt_localcaching,
1372 Opt_debug,
1373 Opt_upgrade,
1374 Opt_acl,
1375 Opt_quota,
1376 Opt_quota_flag,
1377 Opt_suiddir,
1378 Opt_data,
1379 Opt_meta,
1380 Opt_discard,
1381 Opt_commit,
1382 Opt_errors,
1383 Opt_statfs_quantum,
1384 Opt_statfs_percent,
1385 Opt_quota_quantum,
1386 Opt_barrier,
1387 Opt_rgrplvb,
1388 Opt_loccookie,
1389 };
1390
1391 static const struct constant_table gfs2_param_quota[] = {
1392 {"off", GFS2_QUOTA_OFF},
1393 {"account", GFS2_QUOTA_ACCOUNT},
1394 {"on", GFS2_QUOTA_ON},
1395 {"quiet", GFS2_QUOTA_QUIET},
1396 {}
1397 };
1398
1399 enum opt_data {
1400 Opt_data_writeback = GFS2_DATA_WRITEBACK,
1401 Opt_data_ordered = GFS2_DATA_ORDERED,
1402 };
1403
1404 static const struct constant_table gfs2_param_data[] = {
1405 {"writeback", Opt_data_writeback },
1406 {"ordered", Opt_data_ordered },
1407 {}
1408 };
1409
1410 enum opt_errors {
1411 Opt_errors_withdraw = GFS2_ERRORS_WITHDRAW,
1412 Opt_errors_panic = GFS2_ERRORS_PANIC,
1413 };
1414
1415 static const struct constant_table gfs2_param_errors[] = {
1416 {"withdraw", Opt_errors_withdraw },
1417 {"panic", Opt_errors_panic },
1418 {}
1419 };
1420
1421 static const struct fs_parameter_spec gfs2_fs_parameters[] = {
1422 fsparam_string ("lockproto", Opt_lockproto),
1423 fsparam_string ("locktable", Opt_locktable),
1424 fsparam_string ("hostdata", Opt_hostdata),
1425 fsparam_flag ("spectator", Opt_spectator),
1426 fsparam_flag ("norecovery", Opt_spectator),
1427 fsparam_flag ("ignore_local_fs", Opt_ignore_local_fs),
1428 fsparam_flag ("localflocks", Opt_localflocks),
1429 fsparam_flag ("localcaching", Opt_localcaching),
1430 fsparam_flag_no("debug", Opt_debug),
1431 fsparam_flag ("upgrade", Opt_upgrade),
1432 fsparam_flag_no("acl", Opt_acl),
1433 fsparam_flag_no("suiddir", Opt_suiddir),
1434 fsparam_enum ("data", Opt_data, gfs2_param_data),
1435 fsparam_flag ("meta", Opt_meta),
1436 fsparam_flag_no("discard", Opt_discard),
1437 fsparam_s32 ("commit", Opt_commit),
1438 fsparam_enum ("errors", Opt_errors, gfs2_param_errors),
1439 fsparam_s32 ("statfs_quantum", Opt_statfs_quantum),
1440 fsparam_s32 ("statfs_percent", Opt_statfs_percent),
1441 fsparam_s32 ("quota_quantum", Opt_quota_quantum),
1442 fsparam_flag_no("barrier", Opt_barrier),
1443 fsparam_flag_no("rgrplvb", Opt_rgrplvb),
1444 fsparam_flag_no("loccookie", Opt_loccookie),
1445 /* quota can be a flag or an enum so it gets special treatment */
1446 fsparam_flag_no("quota", Opt_quota_flag),
1447 fsparam_enum("quota", Opt_quota, gfs2_param_quota),
1448 {}
1449 };
1450
1451 /* Parse a single mount parameter */
gfs2_parse_param(struct fs_context * fc,struct fs_parameter * param)1452 static int gfs2_parse_param(struct fs_context *fc, struct fs_parameter *param)
1453 {
1454 struct gfs2_args *args = fc->fs_private;
1455 struct fs_parse_result result;
1456 int o;
1457
1458 o = fs_parse(fc, gfs2_fs_parameters, param, &result);
1459 if (o < 0)
1460 return o;
1461
1462 switch (o) {
1463 case Opt_lockproto:
1464 strscpy(args->ar_lockproto, param->string, GFS2_LOCKNAME_LEN);
1465 break;
1466 case Opt_locktable:
1467 strscpy(args->ar_locktable, param->string, GFS2_LOCKNAME_LEN);
1468 break;
1469 case Opt_hostdata:
1470 strscpy(args->ar_hostdata, param->string, GFS2_LOCKNAME_LEN);
1471 break;
1472 case Opt_spectator:
1473 args->ar_spectator = 1;
1474 break;
1475 case Opt_ignore_local_fs:
1476 /* Retained for backwards compat only */
1477 break;
1478 case Opt_localflocks:
1479 args->ar_localflocks = 1;
1480 break;
1481 case Opt_localcaching:
1482 /* Retained for backwards compat only */
1483 break;
1484 case Opt_debug:
1485 if (result.boolean && args->ar_errors == GFS2_ERRORS_PANIC)
1486 return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive");
1487 args->ar_debug = result.boolean;
1488 break;
1489 case Opt_upgrade:
1490 /* Retained for backwards compat only */
1491 break;
1492 case Opt_acl:
1493 args->ar_posix_acl = result.boolean;
1494 break;
1495 case Opt_quota_flag:
1496 args->ar_quota = result.negated ? GFS2_QUOTA_OFF : GFS2_QUOTA_ON;
1497 break;
1498 case Opt_quota:
1499 args->ar_quota = result.int_32;
1500 break;
1501 case Opt_suiddir:
1502 args->ar_suiddir = result.boolean;
1503 break;
1504 case Opt_data:
1505 /* The uint_32 result maps directly to GFS2_DATA_* */
1506 args->ar_data = result.uint_32;
1507 break;
1508 case Opt_meta:
1509 args->ar_meta = 1;
1510 break;
1511 case Opt_discard:
1512 args->ar_discard = result.boolean;
1513 break;
1514 case Opt_commit:
1515 if (result.int_32 <= 0)
1516 return invalfc(fc, "commit mount option requires a positive numeric argument");
1517 args->ar_commit = result.int_32;
1518 break;
1519 case Opt_statfs_quantum:
1520 if (result.int_32 < 0)
1521 return invalfc(fc, "statfs_quantum mount option requires a non-negative numeric argument");
1522 args->ar_statfs_quantum = result.int_32;
1523 break;
1524 case Opt_quota_quantum:
1525 if (result.int_32 <= 0)
1526 return invalfc(fc, "quota_quantum mount option requires a positive numeric argument");
1527 args->ar_quota_quantum = result.int_32;
1528 break;
1529 case Opt_statfs_percent:
1530 if (result.int_32 < 0 || result.int_32 > 100)
1531 return invalfc(fc, "statfs_percent mount option requires a numeric argument between 0 and 100");
1532 args->ar_statfs_percent = result.int_32;
1533 break;
1534 case Opt_errors:
1535 if (args->ar_debug && result.uint_32 == GFS2_ERRORS_PANIC)
1536 return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive");
1537 args->ar_errors = result.uint_32;
1538 break;
1539 case Opt_barrier:
1540 args->ar_nobarrier = result.boolean;
1541 break;
1542 case Opt_rgrplvb:
1543 args->ar_rgrplvb = result.boolean;
1544 args->ar_got_rgrplvb = 1;
1545 break;
1546 case Opt_loccookie:
1547 args->ar_loccookie = result.boolean;
1548 break;
1549 default:
1550 return invalfc(fc, "invalid mount option: %s", param->key);
1551 }
1552 return 0;
1553 }
1554
gfs2_reconfigure(struct fs_context * fc)1555 static int gfs2_reconfigure(struct fs_context *fc)
1556 {
1557 struct super_block *sb = fc->root->d_sb;
1558 struct gfs2_sbd *sdp = sb->s_fs_info;
1559 struct gfs2_args *oldargs = &sdp->sd_args;
1560 struct gfs2_args *newargs = fc->fs_private;
1561 struct gfs2_tune *gt = &sdp->sd_tune;
1562 int error = 0;
1563
1564 sync_filesystem(sb);
1565
1566 spin_lock(>->gt_spin);
1567 oldargs->ar_commit = gt->gt_logd_secs;
1568 oldargs->ar_quota_quantum = gt->gt_quota_quantum;
1569 if (gt->gt_statfs_slow)
1570 oldargs->ar_statfs_quantum = 0;
1571 else
1572 oldargs->ar_statfs_quantum = gt->gt_statfs_quantum;
1573 spin_unlock(>->gt_spin);
1574
1575 if (strcmp(newargs->ar_lockproto, oldargs->ar_lockproto)) {
1576 errorfc(fc, "reconfiguration of locking protocol not allowed");
1577 return -EINVAL;
1578 }
1579 if (strcmp(newargs->ar_locktable, oldargs->ar_locktable)) {
1580 errorfc(fc, "reconfiguration of lock table not allowed");
1581 return -EINVAL;
1582 }
1583 if (strcmp(newargs->ar_hostdata, oldargs->ar_hostdata)) {
1584 errorfc(fc, "reconfiguration of host data not allowed");
1585 return -EINVAL;
1586 }
1587 if (newargs->ar_spectator != oldargs->ar_spectator) {
1588 errorfc(fc, "reconfiguration of spectator mode not allowed");
1589 return -EINVAL;
1590 }
1591 if (newargs->ar_localflocks != oldargs->ar_localflocks) {
1592 errorfc(fc, "reconfiguration of localflocks not allowed");
1593 return -EINVAL;
1594 }
1595 if (newargs->ar_meta != oldargs->ar_meta) {
1596 errorfc(fc, "switching between gfs2 and gfs2meta not allowed");
1597 return -EINVAL;
1598 }
1599 if (oldargs->ar_spectator)
1600 fc->sb_flags |= SB_RDONLY;
1601
1602 if ((sb->s_flags ^ fc->sb_flags) & SB_RDONLY) {
1603 if (fc->sb_flags & SB_RDONLY) {
1604 gfs2_make_fs_ro(sdp);
1605 } else {
1606 error = gfs2_make_fs_rw(sdp);
1607 if (error)
1608 errorfc(fc, "unable to remount read-write");
1609 }
1610 }
1611 sdp->sd_args = *newargs;
1612
1613 if (sdp->sd_args.ar_posix_acl)
1614 sb->s_flags |= SB_POSIXACL;
1615 else
1616 sb->s_flags &= ~SB_POSIXACL;
1617 if (sdp->sd_args.ar_nobarrier)
1618 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1619 else
1620 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1621 spin_lock(>->gt_spin);
1622 gt->gt_logd_secs = newargs->ar_commit;
1623 gt->gt_quota_quantum = newargs->ar_quota_quantum;
1624 if (newargs->ar_statfs_quantum) {
1625 gt->gt_statfs_slow = 0;
1626 gt->gt_statfs_quantum = newargs->ar_statfs_quantum;
1627 }
1628 else {
1629 gt->gt_statfs_slow = 1;
1630 gt->gt_statfs_quantum = 30;
1631 }
1632 spin_unlock(>->gt_spin);
1633
1634 gfs2_online_uevent(sdp);
1635 return error;
1636 }
1637
1638 static const struct fs_context_operations gfs2_context_ops = {
1639 .free = gfs2_fc_free,
1640 .parse_param = gfs2_parse_param,
1641 .get_tree = gfs2_get_tree,
1642 .reconfigure = gfs2_reconfigure,
1643 };
1644
1645 /* Set up the filesystem mount context */
gfs2_init_fs_context(struct fs_context * fc)1646 static int gfs2_init_fs_context(struct fs_context *fc)
1647 {
1648 struct gfs2_args *args;
1649
1650 args = kmalloc(sizeof(*args), GFP_KERNEL);
1651 if (args == NULL)
1652 return -ENOMEM;
1653
1654 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
1655 struct gfs2_sbd *sdp = fc->root->d_sb->s_fs_info;
1656
1657 *args = sdp->sd_args;
1658 } else {
1659 memset(args, 0, sizeof(*args));
1660 args->ar_quota = GFS2_QUOTA_DEFAULT;
1661 args->ar_data = GFS2_DATA_DEFAULT;
1662 args->ar_commit = 30;
1663 args->ar_statfs_quantum = 30;
1664 args->ar_quota_quantum = 60;
1665 args->ar_errors = GFS2_ERRORS_DEFAULT;
1666 }
1667 fc->fs_private = args;
1668 fc->ops = &gfs2_context_ops;
1669 return 0;
1670 }
1671
set_meta_super(struct super_block * s,struct fs_context * fc)1672 static int set_meta_super(struct super_block *s, struct fs_context *fc)
1673 {
1674 return -EINVAL;
1675 }
1676
test_meta_super(struct super_block * s,struct fs_context * fc)1677 static int test_meta_super(struct super_block *s, struct fs_context *fc)
1678 {
1679 return (fc->sget_key == s->s_bdev);
1680 }
1681
gfs2_meta_get_tree(struct fs_context * fc)1682 static int gfs2_meta_get_tree(struct fs_context *fc)
1683 {
1684 struct super_block *s;
1685 struct gfs2_sbd *sdp;
1686 struct path path;
1687 int error;
1688
1689 if (!fc->source || !*fc->source)
1690 return -EINVAL;
1691
1692 error = kern_path(fc->source, LOOKUP_FOLLOW, &path);
1693 if (error) {
1694 pr_warn("path_lookup on %s returned error %d\n",
1695 fc->source, error);
1696 return error;
1697 }
1698 fc->fs_type = &gfs2_fs_type;
1699 fc->sget_key = path.dentry->d_sb->s_bdev;
1700 s = sget_fc(fc, test_meta_super, set_meta_super);
1701 path_put(&path);
1702 if (IS_ERR(s)) {
1703 pr_warn("gfs2 mount does not exist\n");
1704 return PTR_ERR(s);
1705 }
1706 if ((fc->sb_flags ^ s->s_flags) & SB_RDONLY) {
1707 deactivate_locked_super(s);
1708 return -EBUSY;
1709 }
1710 sdp = s->s_fs_info;
1711 fc->root = dget(sdp->sd_master_dir);
1712 return 0;
1713 }
1714
1715 static const struct fs_context_operations gfs2_meta_context_ops = {
1716 .free = gfs2_fc_free,
1717 .get_tree = gfs2_meta_get_tree,
1718 };
1719
gfs2_meta_init_fs_context(struct fs_context * fc)1720 static int gfs2_meta_init_fs_context(struct fs_context *fc)
1721 {
1722 int ret = gfs2_init_fs_context(fc);
1723
1724 if (ret)
1725 return ret;
1726
1727 fc->ops = &gfs2_meta_context_ops;
1728 return 0;
1729 }
1730
1731 /**
1732 * gfs2_evict_inodes - evict inodes cooperatively
1733 * @sb: the superblock
1734 *
1735 * When evicting an inode with a zero link count, we are trying to upgrade the
1736 * inode's iopen glock from SH to EX mode in order to determine if we can
1737 * delete the inode. The other nodes are supposed to evict the inode from
1738 * their caches if they can, and to poke the inode's inode glock if they cannot
1739 * do so. Either behavior allows gfs2_upgrade_iopen_glock() to proceed
1740 * quickly, but if the other nodes are not cooperating, the lock upgrading
1741 * attempt will time out. Since inodes are evicted sequentially, this can add
1742 * up quickly.
1743 *
1744 * Function evict_inodes() tries to keep the s_inode_list_lock list locked over
1745 * a long time, which prevents other inodes from being evicted concurrently.
1746 * This precludes the cooperative behavior we are looking for. This special
1747 * version of evict_inodes() avoids that.
1748 *
1749 * Modeled after drop_pagecache_sb().
1750 */
gfs2_evict_inodes(struct super_block * sb)1751 static void gfs2_evict_inodes(struct super_block *sb)
1752 {
1753 struct inode *inode, *toput_inode = NULL;
1754 struct gfs2_sbd *sdp = sb->s_fs_info;
1755
1756 set_bit(SDF_EVICTING, &sdp->sd_flags);
1757
1758 spin_lock(&sb->s_inode_list_lock);
1759 list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
1760 spin_lock(&inode->i_lock);
1761 if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) &&
1762 !need_resched()) {
1763 spin_unlock(&inode->i_lock);
1764 continue;
1765 }
1766 atomic_inc(&inode->i_count);
1767 spin_unlock(&inode->i_lock);
1768 spin_unlock(&sb->s_inode_list_lock);
1769
1770 iput(toput_inode);
1771 toput_inode = inode;
1772
1773 cond_resched();
1774 spin_lock(&sb->s_inode_list_lock);
1775 }
1776 spin_unlock(&sb->s_inode_list_lock);
1777 iput(toput_inode);
1778 }
1779
gfs2_kill_sb(struct super_block * sb)1780 static void gfs2_kill_sb(struct super_block *sb)
1781 {
1782 struct gfs2_sbd *sdp = sb->s_fs_info;
1783
1784 if (sdp == NULL) {
1785 kill_block_super(sb);
1786 return;
1787 }
1788
1789 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SYNC | GFS2_LFC_KILL_SB);
1790 dput(sdp->sd_root_dir);
1791 dput(sdp->sd_master_dir);
1792 sdp->sd_root_dir = NULL;
1793 sdp->sd_master_dir = NULL;
1794 shrink_dcache_sb(sb);
1795
1796 gfs2_evict_inodes(sb);
1797
1798 /*
1799 * Flush and then drain the delete workqueue here (via
1800 * destroy_workqueue()) to ensure that any delete work that
1801 * may be running will also see the SDF_KILL flag.
1802 */
1803 set_bit(SDF_KILL, &sdp->sd_flags);
1804 gfs2_flush_delete_work(sdp);
1805 destroy_workqueue(sdp->sd_delete_wq);
1806
1807 kill_block_super(sb);
1808 }
1809
1810 struct file_system_type gfs2_fs_type = {
1811 .name = "gfs2",
1812 .fs_flags = FS_REQUIRES_DEV,
1813 .init_fs_context = gfs2_init_fs_context,
1814 .parameters = gfs2_fs_parameters,
1815 .kill_sb = gfs2_kill_sb,
1816 .owner = THIS_MODULE,
1817 };
1818 MODULE_ALIAS_FS("gfs2");
1819
1820 struct file_system_type gfs2meta_fs_type = {
1821 .name = "gfs2meta",
1822 .fs_flags = FS_REQUIRES_DEV,
1823 .init_fs_context = gfs2_meta_init_fs_context,
1824 .owner = THIS_MODULE,
1825 };
1826 MODULE_ALIAS_FS("gfs2meta");
1827