1 /*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
4 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
7 * of the GNU General Public License version 2.
8 */
9
10 #include <linux/sched.h>
11 #include <linux/slab.h>
12 #include <linux/spinlock.h>
13 #include <linux/completion.h>
14 #include <linux/buffer_head.h>
15 #include <linux/blkdev.h>
16 #include <linux/kthread.h>
17 #include <linux/namei.h>
18 #include <linux/mount.h>
19 #include <linux/gfs2_ondisk.h>
20 #include <linux/lm_interface.h>
21
22 #include "gfs2.h"
23 #include "incore.h"
24 #include "bmap.h"
25 #include "glock.h"
26 #include "glops.h"
27 #include "inode.h"
28 #include "mount.h"
29 #include "recovery.h"
30 #include "rgrp.h"
31 #include "super.h"
32 #include "sys.h"
33 #include "util.h"
34 #include "log.h"
35 #include "quota.h"
36 #include "dir.h"
37
38 #define DO 0
39 #define UNDO 1
40
41 static const u32 gfs2_old_fs_formats[] = {
42 0
43 };
44
45 static const u32 gfs2_old_multihost_formats[] = {
46 0
47 };
48
49 /**
50 * gfs2_tune_init - Fill a gfs2_tune structure with default values
51 * @gt: tune
52 *
53 */
54
gfs2_tune_init(struct gfs2_tune * gt)55 static void gfs2_tune_init(struct gfs2_tune *gt)
56 {
57 spin_lock_init(>->gt_spin);
58
59 gt->gt_incore_log_blocks = 1024;
60 gt->gt_log_flush_secs = 60;
61 gt->gt_recoverd_secs = 60;
62 gt->gt_logd_secs = 1;
63 gt->gt_quota_simul_sync = 64;
64 gt->gt_quota_warn_period = 10;
65 gt->gt_quota_scale_num = 1;
66 gt->gt_quota_scale_den = 1;
67 gt->gt_quota_cache_secs = 300;
68 gt->gt_quota_quantum = 60;
69 gt->gt_new_files_jdata = 0;
70 gt->gt_max_readahead = 1 << 18;
71 gt->gt_stall_secs = 600;
72 gt->gt_complain_secs = 10;
73 gt->gt_statfs_quantum = 30;
74 gt->gt_statfs_slow = 0;
75 }
76
init_sbd(struct super_block * sb)77 static struct gfs2_sbd *init_sbd(struct super_block *sb)
78 {
79 struct gfs2_sbd *sdp;
80
81 sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL);
82 if (!sdp)
83 return NULL;
84
85 sb->s_fs_info = sdp;
86 sdp->sd_vfs = sb;
87
88 gfs2_tune_init(&sdp->sd_tune);
89
90 mutex_init(&sdp->sd_inum_mutex);
91 spin_lock_init(&sdp->sd_statfs_spin);
92
93 spin_lock_init(&sdp->sd_rindex_spin);
94 mutex_init(&sdp->sd_rindex_mutex);
95 INIT_LIST_HEAD(&sdp->sd_rindex_list);
96 INIT_LIST_HEAD(&sdp->sd_rindex_mru_list);
97
98 INIT_LIST_HEAD(&sdp->sd_jindex_list);
99 spin_lock_init(&sdp->sd_jindex_spin);
100 mutex_init(&sdp->sd_jindex_mutex);
101
102 INIT_LIST_HEAD(&sdp->sd_quota_list);
103 spin_lock_init(&sdp->sd_quota_spin);
104 mutex_init(&sdp->sd_quota_mutex);
105 init_waitqueue_head(&sdp->sd_quota_wait);
106 INIT_LIST_HEAD(&sdp->sd_trunc_list);
107 spin_lock_init(&sdp->sd_trunc_lock);
108
109 spin_lock_init(&sdp->sd_log_lock);
110
111 INIT_LIST_HEAD(&sdp->sd_log_le_buf);
112 INIT_LIST_HEAD(&sdp->sd_log_le_revoke);
113 INIT_LIST_HEAD(&sdp->sd_log_le_rg);
114 INIT_LIST_HEAD(&sdp->sd_log_le_databuf);
115 INIT_LIST_HEAD(&sdp->sd_log_le_ordered);
116
117 mutex_init(&sdp->sd_log_reserve_mutex);
118 INIT_LIST_HEAD(&sdp->sd_ail1_list);
119 INIT_LIST_HEAD(&sdp->sd_ail2_list);
120
121 init_rwsem(&sdp->sd_log_flush_lock);
122 atomic_set(&sdp->sd_log_in_flight, 0);
123 init_waitqueue_head(&sdp->sd_log_flush_wait);
124
125 INIT_LIST_HEAD(&sdp->sd_revoke_list);
126
127 mutex_init(&sdp->sd_freeze_lock);
128
129 return sdp;
130 }
131
132
133 /**
134 * gfs2_check_sb - Check superblock
135 * @sdp: the filesystem
136 * @sb: The superblock
137 * @silent: Don't print a message if the check fails
138 *
139 * Checks the version code of the FS is one that we understand how to
140 * read and that the sizes of the various on-disk structures have not
141 * changed.
142 */
143
gfs2_check_sb(struct gfs2_sbd * sdp,struct gfs2_sb_host * sb,int silent)144 static int gfs2_check_sb(struct gfs2_sbd *sdp, struct gfs2_sb_host *sb, int silent)
145 {
146 unsigned int x;
147
148 if (sb->sb_magic != GFS2_MAGIC ||
149 sb->sb_type != GFS2_METATYPE_SB) {
150 if (!silent)
151 printk(KERN_WARNING "GFS2: not a GFS2 filesystem\n");
152 return -EINVAL;
153 }
154
155 /* If format numbers match exactly, we're done. */
156
157 if (sb->sb_fs_format == GFS2_FORMAT_FS &&
158 sb->sb_multihost_format == GFS2_FORMAT_MULTI)
159 return 0;
160
161 if (sb->sb_fs_format != GFS2_FORMAT_FS) {
162 for (x = 0; gfs2_old_fs_formats[x]; x++)
163 if (gfs2_old_fs_formats[x] == sb->sb_fs_format)
164 break;
165
166 if (!gfs2_old_fs_formats[x]) {
167 printk(KERN_WARNING
168 "GFS2: code version (%u, %u) is incompatible "
169 "with ondisk format (%u, %u)\n",
170 GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
171 sb->sb_fs_format, sb->sb_multihost_format);
172 printk(KERN_WARNING
173 "GFS2: I don't know how to upgrade this FS\n");
174 return -EINVAL;
175 }
176 }
177
178 if (sb->sb_multihost_format != GFS2_FORMAT_MULTI) {
179 for (x = 0; gfs2_old_multihost_formats[x]; x++)
180 if (gfs2_old_multihost_formats[x] ==
181 sb->sb_multihost_format)
182 break;
183
184 if (!gfs2_old_multihost_formats[x]) {
185 printk(KERN_WARNING
186 "GFS2: code version (%u, %u) is incompatible "
187 "with ondisk format (%u, %u)\n",
188 GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
189 sb->sb_fs_format, sb->sb_multihost_format);
190 printk(KERN_WARNING
191 "GFS2: I don't know how to upgrade this FS\n");
192 return -EINVAL;
193 }
194 }
195
196 if (!sdp->sd_args.ar_upgrade) {
197 printk(KERN_WARNING
198 "GFS2: code version (%u, %u) is incompatible "
199 "with ondisk format (%u, %u)\n",
200 GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
201 sb->sb_fs_format, sb->sb_multihost_format);
202 printk(KERN_INFO
203 "GFS2: Use the \"upgrade\" mount option to upgrade "
204 "the FS\n");
205 printk(KERN_INFO "GFS2: See the manual for more details\n");
206 return -EINVAL;
207 }
208
209 return 0;
210 }
211
end_bio_io_page(struct bio * bio,int error)212 static void end_bio_io_page(struct bio *bio, int error)
213 {
214 struct page *page = bio->bi_private;
215
216 if (!error)
217 SetPageUptodate(page);
218 else
219 printk(KERN_WARNING "gfs2: error %d reading superblock\n", error);
220 unlock_page(page);
221 }
222
gfs2_sb_in(struct gfs2_sb_host * sb,const void * buf)223 static void gfs2_sb_in(struct gfs2_sb_host *sb, const void *buf)
224 {
225 const struct gfs2_sb *str = buf;
226
227 sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic);
228 sb->sb_type = be32_to_cpu(str->sb_header.mh_type);
229 sb->sb_format = be32_to_cpu(str->sb_header.mh_format);
230 sb->sb_fs_format = be32_to_cpu(str->sb_fs_format);
231 sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format);
232 sb->sb_bsize = be32_to_cpu(str->sb_bsize);
233 sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift);
234 sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr);
235 sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino);
236 sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr);
237 sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino);
238
239 memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN);
240 memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN);
241 }
242
243 /**
244 * gfs2_read_super - Read the gfs2 super block from disk
245 * @sdp: The GFS2 super block
246 * @sector: The location of the super block
247 * @error: The error code to return
248 *
249 * This uses the bio functions to read the super block from disk
250 * because we want to be 100% sure that we never read cached data.
251 * A super block is read twice only during each GFS2 mount and is
252 * never written to by the filesystem. The first time its read no
253 * locks are held, and the only details which are looked at are those
254 * relating to the locking protocol. Once locking is up and working,
255 * the sb is read again under the lock to establish the location of
256 * the master directory (contains pointers to journals etc) and the
257 * root directory.
258 *
259 * Returns: 0 on success or error
260 */
261
gfs2_read_super(struct gfs2_sbd * sdp,sector_t sector)262 static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector)
263 {
264 struct super_block *sb = sdp->sd_vfs;
265 struct gfs2_sb *p;
266 struct page *page;
267 struct bio *bio;
268
269 page = alloc_page(GFP_NOFS);
270 if (unlikely(!page))
271 return -ENOBUFS;
272
273 ClearPageUptodate(page);
274 ClearPageDirty(page);
275 lock_page(page);
276
277 bio = bio_alloc(GFP_NOFS, 1);
278 if (unlikely(!bio)) {
279 __free_page(page);
280 return -ENOBUFS;
281 }
282
283 bio->bi_sector = sector * (sb->s_blocksize >> 9);
284 bio->bi_bdev = sb->s_bdev;
285 bio_add_page(bio, page, PAGE_SIZE, 0);
286
287 bio->bi_end_io = end_bio_io_page;
288 bio->bi_private = page;
289 submit_bio(READ_SYNC | (1 << BIO_RW_META), bio);
290 wait_on_page_locked(page);
291 bio_put(bio);
292 if (!PageUptodate(page)) {
293 __free_page(page);
294 return -EIO;
295 }
296 p = kmap(page);
297 gfs2_sb_in(&sdp->sd_sb, p);
298 kunmap(page);
299 __free_page(page);
300 return 0;
301 }
302 /**
303 * gfs2_read_sb - Read super block
304 * @sdp: The GFS2 superblock
305 * @gl: the glock for the superblock (assumed to be held)
306 * @silent: Don't print message if mount fails
307 *
308 */
309
gfs2_read_sb(struct gfs2_sbd * sdp,struct gfs2_glock * gl,int silent)310 static int gfs2_read_sb(struct gfs2_sbd *sdp, struct gfs2_glock *gl, int silent)
311 {
312 u32 hash_blocks, ind_blocks, leaf_blocks;
313 u32 tmp_blocks;
314 unsigned int x;
315 int error;
316
317 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift);
318 if (error) {
319 if (!silent)
320 fs_err(sdp, "can't read superblock\n");
321 return error;
322 }
323
324 error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
325 if (error)
326 return error;
327
328 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
329 GFS2_BASIC_BLOCK_SHIFT;
330 sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
331 sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
332 sizeof(struct gfs2_dinode)) / sizeof(u64);
333 sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
334 sizeof(struct gfs2_meta_header)) / sizeof(u64);
335 sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
336 sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
337 sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
338 sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64);
339 sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
340 sizeof(struct gfs2_meta_header)) /
341 sizeof(struct gfs2_quota_change);
342
343 /* Compute maximum reservation required to add a entry to a directory */
344
345 hash_blocks = DIV_ROUND_UP(sizeof(u64) * (1 << GFS2_DIR_MAX_DEPTH),
346 sdp->sd_jbsize);
347
348 ind_blocks = 0;
349 for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
350 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
351 ind_blocks += tmp_blocks;
352 }
353
354 leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
355
356 sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
357
358 sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
359 sizeof(struct gfs2_dinode);
360 sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
361 for (x = 2;; x++) {
362 u64 space, d;
363 u32 m;
364
365 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
366 d = space;
367 m = do_div(d, sdp->sd_inptrs);
368
369 if (d != sdp->sd_heightsize[x - 1] || m)
370 break;
371 sdp->sd_heightsize[x] = space;
372 }
373 sdp->sd_max_height = x;
374 sdp->sd_heightsize[x] = ~0;
375 gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
376
377 sdp->sd_jheightsize[0] = sdp->sd_sb.sb_bsize -
378 sizeof(struct gfs2_dinode);
379 sdp->sd_jheightsize[1] = sdp->sd_jbsize * sdp->sd_diptrs;
380 for (x = 2;; x++) {
381 u64 space, d;
382 u32 m;
383
384 space = sdp->sd_jheightsize[x - 1] * sdp->sd_inptrs;
385 d = space;
386 m = do_div(d, sdp->sd_inptrs);
387
388 if (d != sdp->sd_jheightsize[x - 1] || m)
389 break;
390 sdp->sd_jheightsize[x] = space;
391 }
392 sdp->sd_max_jheight = x;
393 sdp->sd_jheightsize[x] = ~0;
394 gfs2_assert(sdp, sdp->sd_max_jheight <= GFS2_MAX_META_HEIGHT);
395
396 return 0;
397 }
398
init_names(struct gfs2_sbd * sdp,int silent)399 static int init_names(struct gfs2_sbd *sdp, int silent)
400 {
401 char *proto, *table;
402 int error = 0;
403
404 proto = sdp->sd_args.ar_lockproto;
405 table = sdp->sd_args.ar_locktable;
406
407 /* Try to autodetect */
408
409 if (!proto[0] || !table[0]) {
410 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift);
411 if (error)
412 return error;
413
414 error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
415 if (error)
416 goto out;
417
418 if (!proto[0])
419 proto = sdp->sd_sb.sb_lockproto;
420 if (!table[0])
421 table = sdp->sd_sb.sb_locktable;
422 }
423
424 if (!table[0])
425 table = sdp->sd_vfs->s_id;
426
427 strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN);
428 strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN);
429
430 table = sdp->sd_table_name;
431 while ((table = strchr(table, '/')))
432 *table = '_';
433
434 out:
435 return error;
436 }
437
init_locking(struct gfs2_sbd * sdp,struct gfs2_holder * mount_gh,int undo)438 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
439 int undo)
440 {
441 int error = 0;
442
443 if (undo)
444 goto fail_trans;
445
446 error = gfs2_glock_nq_num(sdp,
447 GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
448 LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
449 mount_gh);
450 if (error) {
451 fs_err(sdp, "can't acquire mount glock: %d\n", error);
452 goto fail;
453 }
454
455 error = gfs2_glock_nq_num(sdp,
456 GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
457 LM_ST_SHARED,
458 LM_FLAG_NOEXP | GL_EXACT,
459 &sdp->sd_live_gh);
460 if (error) {
461 fs_err(sdp, "can't acquire live glock: %d\n", error);
462 goto fail_mount;
463 }
464
465 error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
466 CREATE, &sdp->sd_rename_gl);
467 if (error) {
468 fs_err(sdp, "can't create rename glock: %d\n", error);
469 goto fail_live;
470 }
471
472 error = gfs2_glock_get(sdp, GFS2_TRANS_LOCK, &gfs2_trans_glops,
473 CREATE, &sdp->sd_trans_gl);
474 if (error) {
475 fs_err(sdp, "can't create transaction glock: %d\n", error);
476 goto fail_rename;
477 }
478
479 return 0;
480
481 fail_trans:
482 gfs2_glock_put(sdp->sd_trans_gl);
483 fail_rename:
484 gfs2_glock_put(sdp->sd_rename_gl);
485 fail_live:
486 gfs2_glock_dq_uninit(&sdp->sd_live_gh);
487 fail_mount:
488 gfs2_glock_dq_uninit(mount_gh);
489 fail:
490 return error;
491 }
492
gfs2_lookup_root(struct super_block * sb,struct dentry ** dptr,u64 no_addr,const char * name)493 static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr,
494 u64 no_addr, const char *name)
495 {
496 struct gfs2_sbd *sdp = sb->s_fs_info;
497 struct dentry *dentry;
498 struct inode *inode;
499
500 inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0, 0);
501 if (IS_ERR(inode)) {
502 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode));
503 return PTR_ERR(inode);
504 }
505 dentry = d_alloc_root(inode);
506 if (!dentry) {
507 fs_err(sdp, "can't alloc %s dentry\n", name);
508 iput(inode);
509 return -ENOMEM;
510 }
511 dentry->d_op = &gfs2_dops;
512 *dptr = dentry;
513 return 0;
514 }
515
init_sb(struct gfs2_sbd * sdp,int silent)516 static int init_sb(struct gfs2_sbd *sdp, int silent)
517 {
518 struct super_block *sb = sdp->sd_vfs;
519 struct gfs2_holder sb_gh;
520 u64 no_addr;
521 int ret;
522
523 ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
524 LM_ST_SHARED, 0, &sb_gh);
525 if (ret) {
526 fs_err(sdp, "can't acquire superblock glock: %d\n", ret);
527 return ret;
528 }
529
530 ret = gfs2_read_sb(sdp, sb_gh.gh_gl, silent);
531 if (ret) {
532 fs_err(sdp, "can't read superblock: %d\n", ret);
533 goto out;
534 }
535
536 /* Set up the buffer cache and SB for real */
537 if (sdp->sd_sb.sb_bsize < bdev_hardsect_size(sb->s_bdev)) {
538 ret = -EINVAL;
539 fs_err(sdp, "FS block size (%u) is too small for device "
540 "block size (%u)\n",
541 sdp->sd_sb.sb_bsize, bdev_hardsect_size(sb->s_bdev));
542 goto out;
543 }
544 if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
545 ret = -EINVAL;
546 fs_err(sdp, "FS block size (%u) is too big for machine "
547 "page size (%u)\n",
548 sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
549 goto out;
550 }
551 sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
552
553 /* Get the root inode */
554 no_addr = sdp->sd_sb.sb_root_dir.no_addr;
555 ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root");
556 if (ret)
557 goto out;
558
559 /* Get the master inode */
560 no_addr = sdp->sd_sb.sb_master_dir.no_addr;
561 ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master");
562 if (ret) {
563 dput(sdp->sd_root_dir);
564 goto out;
565 }
566 sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir);
567 out:
568 gfs2_glock_dq_uninit(&sb_gh);
569 return ret;
570 }
571
572 /**
573 * map_journal_extents - create a reusable "extent" mapping from all logical
574 * blocks to all physical blocks for the given journal. This will save
575 * us time when writing journal blocks. Most journals will have only one
576 * extent that maps all their logical blocks. That's because gfs2.mkfs
577 * arranges the journal blocks sequentially to maximize performance.
578 * So the extent would map the first block for the entire file length.
579 * However, gfs2_jadd can happen while file activity is happening, so
580 * those journals may not be sequential. Less likely is the case where
581 * the users created their own journals by mounting the metafs and
582 * laying it out. But it's still possible. These journals might have
583 * several extents.
584 *
585 * TODO: This should be done in bigger chunks rather than one block at a time,
586 * but since it's only done at mount time, I'm not worried about the
587 * time it takes.
588 */
map_journal_extents(struct gfs2_sbd * sdp)589 static int map_journal_extents(struct gfs2_sbd *sdp)
590 {
591 struct gfs2_jdesc *jd = sdp->sd_jdesc;
592 unsigned int lb;
593 u64 db, prev_db; /* logical block, disk block, prev disk block */
594 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
595 struct gfs2_journal_extent *jext = NULL;
596 struct buffer_head bh;
597 int rc = 0;
598
599 prev_db = 0;
600
601 for (lb = 0; lb < ip->i_disksize >> sdp->sd_sb.sb_bsize_shift; lb++) {
602 bh.b_state = 0;
603 bh.b_blocknr = 0;
604 bh.b_size = 1 << ip->i_inode.i_blkbits;
605 rc = gfs2_block_map(jd->jd_inode, lb, &bh, 0);
606 db = bh.b_blocknr;
607 if (rc || !db) {
608 printk(KERN_INFO "GFS2 journal mapping error %d: lb="
609 "%u db=%llu\n", rc, lb, (unsigned long long)db);
610 break;
611 }
612 if (!prev_db || db != prev_db + 1) {
613 jext = kzalloc(sizeof(struct gfs2_journal_extent),
614 GFP_KERNEL);
615 if (!jext) {
616 printk(KERN_INFO "GFS2 error: out of memory "
617 "mapping journal extents.\n");
618 rc = -ENOMEM;
619 break;
620 }
621 jext->dblock = db;
622 jext->lblock = lb;
623 jext->blocks = 1;
624 list_add_tail(&jext->extent_list, &jd->extent_list);
625 } else {
626 jext->blocks++;
627 }
628 prev_db = db;
629 }
630 return rc;
631 }
632
gfs2_lm_others_may_mount(struct gfs2_sbd * sdp)633 static void gfs2_lm_others_may_mount(struct gfs2_sbd *sdp)
634 {
635 if (!sdp->sd_lockstruct.ls_ops->lm_others_may_mount)
636 return;
637 if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
638 sdp->sd_lockstruct.ls_ops->lm_others_may_mount(
639 sdp->sd_lockstruct.ls_lockspace);
640 }
641
642 /**
643 * gfs2_jindex_hold - Grab a lock on the jindex
644 * @sdp: The GFS2 superblock
645 * @ji_gh: the holder for the jindex glock
646 *
647 * Returns: errno
648 */
649
gfs2_jindex_hold(struct gfs2_sbd * sdp,struct gfs2_holder * ji_gh)650 static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
651 {
652 struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex);
653 struct qstr name;
654 char buf[20];
655 struct gfs2_jdesc *jd;
656 int error;
657
658 name.name = buf;
659
660 mutex_lock(&sdp->sd_jindex_mutex);
661
662 for (;;) {
663 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh);
664 if (error)
665 break;
666
667 name.len = sprintf(buf, "journal%u", sdp->sd_journals);
668 name.hash = gfs2_disk_hash(name.name, name.len);
669
670 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL);
671 if (error == -ENOENT) {
672 error = 0;
673 break;
674 }
675
676 gfs2_glock_dq_uninit(ji_gh);
677
678 if (error)
679 break;
680
681 error = -ENOMEM;
682 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
683 if (!jd)
684 break;
685
686 INIT_LIST_HEAD(&jd->extent_list);
687 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1);
688 if (!jd->jd_inode || IS_ERR(jd->jd_inode)) {
689 if (!jd->jd_inode)
690 error = -ENOENT;
691 else
692 error = PTR_ERR(jd->jd_inode);
693 kfree(jd);
694 break;
695 }
696
697 spin_lock(&sdp->sd_jindex_spin);
698 jd->jd_jid = sdp->sd_journals++;
699 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
700 spin_unlock(&sdp->sd_jindex_spin);
701 }
702
703 mutex_unlock(&sdp->sd_jindex_mutex);
704
705 return error;
706 }
707
init_journal(struct gfs2_sbd * sdp,int undo)708 static int init_journal(struct gfs2_sbd *sdp, int undo)
709 {
710 struct inode *master = sdp->sd_master_dir->d_inode;
711 struct gfs2_holder ji_gh;
712 struct task_struct *p;
713 struct gfs2_inode *ip;
714 int jindex = 1;
715 int error = 0;
716
717 if (undo) {
718 jindex = 0;
719 goto fail_recoverd;
720 }
721
722 sdp->sd_jindex = gfs2_lookup_simple(master, "jindex");
723 if (IS_ERR(sdp->sd_jindex)) {
724 fs_err(sdp, "can't lookup journal index: %d\n", error);
725 return PTR_ERR(sdp->sd_jindex);
726 }
727 ip = GFS2_I(sdp->sd_jindex);
728
729 /* Load in the journal index special file */
730
731 error = gfs2_jindex_hold(sdp, &ji_gh);
732 if (error) {
733 fs_err(sdp, "can't read journal index: %d\n", error);
734 goto fail;
735 }
736
737 error = -EINVAL;
738 if (!gfs2_jindex_size(sdp)) {
739 fs_err(sdp, "no journals!\n");
740 goto fail_jindex;
741 }
742
743 if (sdp->sd_args.ar_spectator) {
744 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
745 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
746 } else {
747 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
748 fs_err(sdp, "can't mount journal #%u\n",
749 sdp->sd_lockstruct.ls_jid);
750 fs_err(sdp, "there are only %u journals (0 - %u)\n",
751 gfs2_jindex_size(sdp),
752 gfs2_jindex_size(sdp) - 1);
753 goto fail_jindex;
754 }
755 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
756
757 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
758 &gfs2_journal_glops,
759 LM_ST_EXCLUSIVE, LM_FLAG_NOEXP,
760 &sdp->sd_journal_gh);
761 if (error) {
762 fs_err(sdp, "can't acquire journal glock: %d\n", error);
763 goto fail_jindex;
764 }
765
766 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
767 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
768 LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE,
769 &sdp->sd_jinode_gh);
770 if (error) {
771 fs_err(sdp, "can't acquire journal inode glock: %d\n",
772 error);
773 goto fail_journal_gh;
774 }
775
776 error = gfs2_jdesc_check(sdp->sd_jdesc);
777 if (error) {
778 fs_err(sdp, "my journal (%u) is bad: %d\n",
779 sdp->sd_jdesc->jd_jid, error);
780 goto fail_jinode_gh;
781 }
782 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
783
784 /* Map the extents for this journal's blocks */
785 map_journal_extents(sdp);
786 }
787
788 if (sdp->sd_lockstruct.ls_first) {
789 unsigned int x;
790 for (x = 0; x < sdp->sd_journals; x++) {
791 error = gfs2_recover_journal(gfs2_jdesc_find(sdp, x));
792 if (error) {
793 fs_err(sdp, "error recovering journal %u: %d\n",
794 x, error);
795 goto fail_jinode_gh;
796 }
797 }
798
799 gfs2_lm_others_may_mount(sdp);
800 } else if (!sdp->sd_args.ar_spectator) {
801 error = gfs2_recover_journal(sdp->sd_jdesc);
802 if (error) {
803 fs_err(sdp, "error recovering my journal: %d\n", error);
804 goto fail_jinode_gh;
805 }
806 }
807
808 set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
809 gfs2_glock_dq_uninit(&ji_gh);
810 jindex = 0;
811
812 p = kthread_run(gfs2_recoverd, sdp, "gfs2_recoverd");
813 error = IS_ERR(p);
814 if (error) {
815 fs_err(sdp, "can't start recoverd thread: %d\n", error);
816 goto fail_jinode_gh;
817 }
818 sdp->sd_recoverd_process = p;
819
820 return 0;
821
822 fail_recoverd:
823 kthread_stop(sdp->sd_recoverd_process);
824 fail_jinode_gh:
825 if (!sdp->sd_args.ar_spectator)
826 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
827 fail_journal_gh:
828 if (!sdp->sd_args.ar_spectator)
829 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
830 fail_jindex:
831 gfs2_jindex_free(sdp);
832 if (jindex)
833 gfs2_glock_dq_uninit(&ji_gh);
834 fail:
835 iput(sdp->sd_jindex);
836 return error;
837 }
838
839
init_inodes(struct gfs2_sbd * sdp,int undo)840 static int init_inodes(struct gfs2_sbd *sdp, int undo)
841 {
842 int error = 0;
843 struct gfs2_inode *ip;
844 struct inode *master = sdp->sd_master_dir->d_inode;
845
846 if (undo)
847 goto fail_qinode;
848
849 error = init_journal(sdp, undo);
850 if (error)
851 goto fail;
852
853 /* Read in the master inode number inode */
854 sdp->sd_inum_inode = gfs2_lookup_simple(master, "inum");
855 if (IS_ERR(sdp->sd_inum_inode)) {
856 error = PTR_ERR(sdp->sd_inum_inode);
857 fs_err(sdp, "can't read in inum inode: %d\n", error);
858 goto fail_journal;
859 }
860
861
862 /* Read in the master statfs inode */
863 sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs");
864 if (IS_ERR(sdp->sd_statfs_inode)) {
865 error = PTR_ERR(sdp->sd_statfs_inode);
866 fs_err(sdp, "can't read in statfs inode: %d\n", error);
867 goto fail_inum;
868 }
869
870 /* Read in the resource index inode */
871 sdp->sd_rindex = gfs2_lookup_simple(master, "rindex");
872 if (IS_ERR(sdp->sd_rindex)) {
873 error = PTR_ERR(sdp->sd_rindex);
874 fs_err(sdp, "can't get resource index inode: %d\n", error);
875 goto fail_statfs;
876 }
877 ip = GFS2_I(sdp->sd_rindex);
878 sdp->sd_rindex_uptodate = 0;
879
880 /* Read in the quota inode */
881 sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota");
882 if (IS_ERR(sdp->sd_quota_inode)) {
883 error = PTR_ERR(sdp->sd_quota_inode);
884 fs_err(sdp, "can't get quota file inode: %d\n", error);
885 goto fail_rindex;
886 }
887 return 0;
888
889 fail_qinode:
890 iput(sdp->sd_quota_inode);
891 fail_rindex:
892 gfs2_clear_rgrpd(sdp);
893 iput(sdp->sd_rindex);
894 fail_statfs:
895 iput(sdp->sd_statfs_inode);
896 fail_inum:
897 iput(sdp->sd_inum_inode);
898 fail_journal:
899 init_journal(sdp, UNDO);
900 fail:
901 return error;
902 }
903
init_per_node(struct gfs2_sbd * sdp,int undo)904 static int init_per_node(struct gfs2_sbd *sdp, int undo)
905 {
906 struct inode *pn = NULL;
907 char buf[30];
908 int error = 0;
909 struct gfs2_inode *ip;
910 struct inode *master = sdp->sd_master_dir->d_inode;
911
912 if (sdp->sd_args.ar_spectator)
913 return 0;
914
915 if (undo)
916 goto fail_qc_gh;
917
918 pn = gfs2_lookup_simple(master, "per_node");
919 if (IS_ERR(pn)) {
920 error = PTR_ERR(pn);
921 fs_err(sdp, "can't find per_node directory: %d\n", error);
922 return error;
923 }
924
925 sprintf(buf, "inum_range%u", sdp->sd_jdesc->jd_jid);
926 sdp->sd_ir_inode = gfs2_lookup_simple(pn, buf);
927 if (IS_ERR(sdp->sd_ir_inode)) {
928 error = PTR_ERR(sdp->sd_ir_inode);
929 fs_err(sdp, "can't find local \"ir\" file: %d\n", error);
930 goto fail;
931 }
932
933 sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid);
934 sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf);
935 if (IS_ERR(sdp->sd_sc_inode)) {
936 error = PTR_ERR(sdp->sd_sc_inode);
937 fs_err(sdp, "can't find local \"sc\" file: %d\n", error);
938 goto fail_ir_i;
939 }
940
941 sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
942 sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
943 if (IS_ERR(sdp->sd_qc_inode)) {
944 error = PTR_ERR(sdp->sd_qc_inode);
945 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
946 goto fail_ut_i;
947 }
948
949 iput(pn);
950 pn = NULL;
951
952 ip = GFS2_I(sdp->sd_ir_inode);
953 error = gfs2_glock_nq_init(ip->i_gl,
954 LM_ST_EXCLUSIVE, 0,
955 &sdp->sd_ir_gh);
956 if (error) {
957 fs_err(sdp, "can't lock local \"ir\" file: %d\n", error);
958 goto fail_qc_i;
959 }
960
961 ip = GFS2_I(sdp->sd_sc_inode);
962 error = gfs2_glock_nq_init(ip->i_gl,
963 LM_ST_EXCLUSIVE, 0,
964 &sdp->sd_sc_gh);
965 if (error) {
966 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
967 goto fail_ir_gh;
968 }
969
970 ip = GFS2_I(sdp->sd_qc_inode);
971 error = gfs2_glock_nq_init(ip->i_gl,
972 LM_ST_EXCLUSIVE, 0,
973 &sdp->sd_qc_gh);
974 if (error) {
975 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
976 goto fail_ut_gh;
977 }
978
979 return 0;
980
981 fail_qc_gh:
982 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
983 fail_ut_gh:
984 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
985 fail_ir_gh:
986 gfs2_glock_dq_uninit(&sdp->sd_ir_gh);
987 fail_qc_i:
988 iput(sdp->sd_qc_inode);
989 fail_ut_i:
990 iput(sdp->sd_sc_inode);
991 fail_ir_i:
992 iput(sdp->sd_ir_inode);
993 fail:
994 if (pn)
995 iput(pn);
996 return error;
997 }
998
init_threads(struct gfs2_sbd * sdp,int undo)999 static int init_threads(struct gfs2_sbd *sdp, int undo)
1000 {
1001 struct task_struct *p;
1002 int error = 0;
1003
1004 if (undo)
1005 goto fail_quotad;
1006
1007 sdp->sd_log_flush_time = jiffies;
1008 sdp->sd_jindex_refresh_time = jiffies;
1009
1010 p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
1011 error = IS_ERR(p);
1012 if (error) {
1013 fs_err(sdp, "can't start logd thread: %d\n", error);
1014 return error;
1015 }
1016 sdp->sd_logd_process = p;
1017
1018 p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
1019 error = IS_ERR(p);
1020 if (error) {
1021 fs_err(sdp, "can't start quotad thread: %d\n", error);
1022 goto fail;
1023 }
1024 sdp->sd_quotad_process = p;
1025
1026 return 0;
1027
1028
1029 fail_quotad:
1030 kthread_stop(sdp->sd_quotad_process);
1031 fail:
1032 kthread_stop(sdp->sd_logd_process);
1033 return error;
1034 }
1035
1036 /**
1037 * gfs2_lm_mount - mount a locking protocol
1038 * @sdp: the filesystem
1039 * @args: mount arguements
1040 * @silent: if 1, don't complain if the FS isn't a GFS2 fs
1041 *
1042 * Returns: errno
1043 */
1044
gfs2_lm_mount(struct gfs2_sbd * sdp,int silent)1045 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
1046 {
1047 char *proto = sdp->sd_proto_name;
1048 char *table = sdp->sd_table_name;
1049 int flags = LM_MFLAG_CONV_NODROP;
1050 int error;
1051
1052 if (sdp->sd_args.ar_spectator)
1053 flags |= LM_MFLAG_SPECTATOR;
1054
1055 fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);
1056
1057 error = gfs2_mount_lockproto(proto, table, sdp->sd_args.ar_hostdata,
1058 gfs2_glock_cb, sdp,
1059 GFS2_MIN_LVB_SIZE, flags,
1060 &sdp->sd_lockstruct, &sdp->sd_kobj);
1061 if (error) {
1062 fs_info(sdp, "can't mount proto=%s, table=%s, hostdata=%s\n",
1063 proto, table, sdp->sd_args.ar_hostdata);
1064 goto out;
1065 }
1066
1067 if (gfs2_assert_warn(sdp, sdp->sd_lockstruct.ls_ops) ||
1068 gfs2_assert_warn(sdp, sdp->sd_lockstruct.ls_lvb_size >=
1069 GFS2_MIN_LVB_SIZE)) {
1070 gfs2_unmount_lockproto(&sdp->sd_lockstruct);
1071 goto out;
1072 }
1073
1074 if (sdp->sd_args.ar_spectator)
1075 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.s", table);
1076 else
1077 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.%u", table,
1078 sdp->sd_lockstruct.ls_jid);
1079
1080 fs_info(sdp, "Joined cluster. Now mounting FS...\n");
1081
1082 if ((sdp->sd_lockstruct.ls_flags & LM_LSFLAG_LOCAL) &&
1083 !sdp->sd_args.ar_ignore_local_fs) {
1084 sdp->sd_args.ar_localflocks = 1;
1085 sdp->sd_args.ar_localcaching = 1;
1086 }
1087
1088 out:
1089 return error;
1090 }
1091
gfs2_lm_unmount(struct gfs2_sbd * sdp)1092 void gfs2_lm_unmount(struct gfs2_sbd *sdp)
1093 {
1094 if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
1095 gfs2_unmount_lockproto(&sdp->sd_lockstruct);
1096 }
1097
1098 /**
1099 * fill_super - Read in superblock
1100 * @sb: The VFS superblock
1101 * @data: Mount options
1102 * @silent: Don't complain if it's not a GFS2 filesystem
1103 *
1104 * Returns: errno
1105 */
1106
fill_super(struct super_block * sb,void * data,int silent)1107 static int fill_super(struct super_block *sb, void *data, int silent)
1108 {
1109 struct gfs2_sbd *sdp;
1110 struct gfs2_holder mount_gh;
1111 int error;
1112
1113 sdp = init_sbd(sb);
1114 if (!sdp) {
1115 printk(KERN_WARNING "GFS2: can't alloc struct gfs2_sbd\n");
1116 return -ENOMEM;
1117 }
1118
1119 error = gfs2_mount_args(sdp, (char *)data, 0);
1120 if (error) {
1121 printk(KERN_WARNING "GFS2: can't parse mount arguments\n");
1122 goto fail;
1123 }
1124
1125 sb->s_magic = GFS2_MAGIC;
1126 sb->s_op = &gfs2_super_ops;
1127 sb->s_export_op = &gfs2_export_ops;
1128 sb->s_time_gran = 1;
1129 sb->s_maxbytes = MAX_LFS_FILESIZE;
1130
1131 /* Set up the buffer cache and fill in some fake block size values
1132 to allow us to read-in the on-disk superblock. */
1133 sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
1134 sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
1135 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
1136 GFS2_BASIC_BLOCK_SHIFT;
1137 sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
1138
1139 error = init_names(sdp, silent);
1140 if (error)
1141 goto fail;
1142
1143 gfs2_create_debugfs_file(sdp);
1144
1145 error = gfs2_sys_fs_add(sdp);
1146 if (error)
1147 goto fail;
1148
1149 error = gfs2_lm_mount(sdp, silent);
1150 if (error)
1151 goto fail_sys;
1152
1153 error = init_locking(sdp, &mount_gh, DO);
1154 if (error)
1155 goto fail_lm;
1156
1157 error = init_sb(sdp, silent);
1158 if (error)
1159 goto fail_locking;
1160
1161 error = init_inodes(sdp, DO);
1162 if (error)
1163 goto fail_sb;
1164
1165 error = init_per_node(sdp, DO);
1166 if (error)
1167 goto fail_inodes;
1168
1169 error = gfs2_statfs_init(sdp);
1170 if (error) {
1171 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
1172 goto fail_per_node;
1173 }
1174
1175 error = init_threads(sdp, DO);
1176 if (error)
1177 goto fail_per_node;
1178
1179 if (!(sb->s_flags & MS_RDONLY)) {
1180 error = gfs2_make_fs_rw(sdp);
1181 if (error) {
1182 fs_err(sdp, "can't make FS RW: %d\n", error);
1183 goto fail_threads;
1184 }
1185 }
1186
1187 gfs2_glock_dq_uninit(&mount_gh);
1188
1189 return 0;
1190
1191 fail_threads:
1192 init_threads(sdp, UNDO);
1193 fail_per_node:
1194 init_per_node(sdp, UNDO);
1195 fail_inodes:
1196 init_inodes(sdp, UNDO);
1197 fail_sb:
1198 if (sdp->sd_root_dir)
1199 dput(sdp->sd_root_dir);
1200 if (sdp->sd_master_dir)
1201 dput(sdp->sd_master_dir);
1202 sb->s_root = NULL;
1203 fail_locking:
1204 init_locking(sdp, &mount_gh, UNDO);
1205 fail_lm:
1206 gfs2_gl_hash_clear(sdp);
1207 gfs2_lm_unmount(sdp);
1208 while (invalidate_inodes(sb))
1209 yield();
1210 fail_sys:
1211 gfs2_sys_fs_del(sdp);
1212 fail:
1213 gfs2_delete_debugfs_file(sdp);
1214 kfree(sdp);
1215 sb->s_fs_info = NULL;
1216 return error;
1217 }
1218
gfs2_get_sb(struct file_system_type * fs_type,int flags,const char * dev_name,void * data,struct vfsmount * mnt)1219 static int gfs2_get_sb(struct file_system_type *fs_type, int flags,
1220 const char *dev_name, void *data, struct vfsmount *mnt)
1221 {
1222 return get_sb_bdev(fs_type, flags, dev_name, data, fill_super, mnt);
1223 }
1224
get_gfs2_sb(const char * dev_name)1225 static struct super_block *get_gfs2_sb(const char *dev_name)
1226 {
1227 struct super_block *sb;
1228 struct nameidata nd;
1229 int error;
1230
1231 error = path_lookup(dev_name, LOOKUP_FOLLOW, &nd);
1232 if (error) {
1233 printk(KERN_WARNING "GFS2: path_lookup on %s returned error %d\n",
1234 dev_name, error);
1235 return NULL;
1236 }
1237 sb = nd.path.dentry->d_inode->i_sb;
1238 if (sb && (sb->s_type == &gfs2_fs_type))
1239 atomic_inc(&sb->s_active);
1240 else
1241 sb = NULL;
1242 path_put(&nd.path);
1243 return sb;
1244 }
1245
gfs2_get_sb_meta(struct file_system_type * fs_type,int flags,const char * dev_name,void * data,struct vfsmount * mnt)1246 static int gfs2_get_sb_meta(struct file_system_type *fs_type, int flags,
1247 const char *dev_name, void *data, struct vfsmount *mnt)
1248 {
1249 struct super_block *sb = NULL;
1250 struct gfs2_sbd *sdp;
1251
1252 sb = get_gfs2_sb(dev_name);
1253 if (!sb) {
1254 printk(KERN_WARNING "GFS2: gfs2 mount does not exist\n");
1255 return -ENOENT;
1256 }
1257 sdp = sb->s_fs_info;
1258 mnt->mnt_sb = sb;
1259 mnt->mnt_root = dget(sdp->sd_master_dir);
1260 return 0;
1261 }
1262
gfs2_kill_sb(struct super_block * sb)1263 static void gfs2_kill_sb(struct super_block *sb)
1264 {
1265 struct gfs2_sbd *sdp = sb->s_fs_info;
1266
1267 if (sdp == NULL) {
1268 kill_block_super(sb);
1269 return;
1270 }
1271
1272 gfs2_meta_syncfs(sdp);
1273 dput(sdp->sd_root_dir);
1274 dput(sdp->sd_master_dir);
1275 sdp->sd_root_dir = NULL;
1276 sdp->sd_master_dir = NULL;
1277 shrink_dcache_sb(sb);
1278 kill_block_super(sb);
1279 gfs2_delete_debugfs_file(sdp);
1280 kfree(sdp);
1281 }
1282
1283 struct file_system_type gfs2_fs_type = {
1284 .name = "gfs2",
1285 .fs_flags = FS_REQUIRES_DEV,
1286 .get_sb = gfs2_get_sb,
1287 .kill_sb = gfs2_kill_sb,
1288 .owner = THIS_MODULE,
1289 };
1290
1291 struct file_system_type gfs2meta_fs_type = {
1292 .name = "gfs2meta",
1293 .fs_flags = FS_REQUIRES_DEV,
1294 .get_sb = gfs2_get_sb_meta,
1295 .owner = THIS_MODULE,
1296 };
1297
1298