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
25 #include "gfs2.h"
26 #include "incore.h"
27 #include "bmap.h"
28 #include "glock.h"
29 #include "glops.h"
30 #include "inode.h"
31 #include "recovery.h"
32 #include "rgrp.h"
33 #include "super.h"
34 #include "sys.h"
35 #include "util.h"
36 #include "log.h"
37 #include "quota.h"
38 #include "dir.h"
39 #include "meta_io.h"
40 #include "trace_gfs2.h"
41 #include "lops.h"
42
43 #define DO 0
44 #define UNDO 1
45
46 /**
47 * gfs2_tune_init - Fill a gfs2_tune structure with default values
48 * @gt: tune
49 *
50 */
51
52 static void gfs2_tune_init(struct gfs2_tune *gt)
53 {
54 spin_lock_init(>->gt_spin);
55
56 gt->gt_quota_warn_period = 10;
57 gt->gt_quota_scale_num = 1;
58 gt->gt_quota_scale_den = 1;
59 gt->gt_new_files_jdata = 0;
60 gt->gt_max_readahead = BIT(18);
61 gt->gt_complain_secs = 10;
62 }
63
64 static struct gfs2_sbd *init_sbd(struct super_block *sb)
65 {
66 struct gfs2_sbd *sdp;
67 struct address_space *mapping;
68
69 sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL);
70 if (!sdp)
71 return NULL;
72
73 sdp->sd_vfs = sb;
74 sdp->sd_lkstats = alloc_percpu(struct gfs2_pcpu_lkstats);
75 if (!sdp->sd_lkstats) {
76 kfree(sdp);
77 return NULL;
78 }
79 sb->s_fs_info = sdp;
80
81 set_bit(SDF_NOJOURNALID, &sdp->sd_flags);
82 gfs2_tune_init(&sdp->sd_tune);
83
84 init_waitqueue_head(&sdp->sd_glock_wait);
85 atomic_set(&sdp->sd_glock_disposal, 0);
86 init_completion(&sdp->sd_locking_init);
87 init_completion(&sdp->sd_wdack);
88 spin_lock_init(&sdp->sd_statfs_spin);
89
90 spin_lock_init(&sdp->sd_rindex_spin);
91 sdp->sd_rindex_tree.rb_node = NULL;
92
93 INIT_LIST_HEAD(&sdp->sd_jindex_list);
94 spin_lock_init(&sdp->sd_jindex_spin);
95 mutex_init(&sdp->sd_jindex_mutex);
96 init_completion(&sdp->sd_journal_ready);
97
98 INIT_LIST_HEAD(&sdp->sd_quota_list);
99 mutex_init(&sdp->sd_quota_mutex);
100 mutex_init(&sdp->sd_quota_sync_mutex);
101 init_waitqueue_head(&sdp->sd_quota_wait);
102 INIT_LIST_HEAD(&sdp->sd_trunc_list);
103 spin_lock_init(&sdp->sd_trunc_lock);
104 spin_lock_init(&sdp->sd_bitmap_lock);
105
106 mapping = &sdp->sd_aspace;
107
108 address_space_init_once(mapping);
109 mapping->a_ops = &gfs2_rgrp_aops;
110 mapping->host = sb->s_bdev->bd_inode;
111 mapping->flags = 0;
112 mapping_set_gfp_mask(mapping, GFP_NOFS);
113 mapping->private_data = NULL;
114 mapping->writeback_index = 0;
115
116 spin_lock_init(&sdp->sd_log_lock);
117 atomic_set(&sdp->sd_log_pinned, 0);
118 INIT_LIST_HEAD(&sdp->sd_log_revokes);
119 INIT_LIST_HEAD(&sdp->sd_log_ordered);
120 spin_lock_init(&sdp->sd_ordered_lock);
121
122 init_waitqueue_head(&sdp->sd_log_waitq);
123 init_waitqueue_head(&sdp->sd_logd_waitq);
124 spin_lock_init(&sdp->sd_ail_lock);
125 INIT_LIST_HEAD(&sdp->sd_ail1_list);
126 INIT_LIST_HEAD(&sdp->sd_ail2_list);
127
128 init_rwsem(&sdp->sd_log_flush_lock);
129 atomic_set(&sdp->sd_log_in_flight, 0);
130 atomic_set(&sdp->sd_reserving_log, 0);
131 init_waitqueue_head(&sdp->sd_reserving_log_wait);
132 init_waitqueue_head(&sdp->sd_log_flush_wait);
133 atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN);
134 mutex_init(&sdp->sd_freeze_mutex);
135
136 return sdp;
137 }
138
139
140 /**
141 * gfs2_check_sb - Check superblock
142 * @sdp: the filesystem
143 * @sb: The superblock
144 * @silent: Don't print a message if the check fails
145 *
146 * Checks the version code of the FS is one that we understand how to
147 * read and that the sizes of the various on-disk structures have not
148 * changed.
149 */
150
151 static int gfs2_check_sb(struct gfs2_sbd *sdp, int silent)
152 {
153 struct gfs2_sb_host *sb = &sdp->sd_sb;
154
155 if (sb->sb_magic != GFS2_MAGIC ||
156 sb->sb_type != GFS2_METATYPE_SB) {
157 if (!silent)
158 pr_warn("not a GFS2 filesystem\n");
159 return -EINVAL;
160 }
161
162 /* If format numbers match exactly, we're done. */
163
164 if (sb->sb_fs_format == GFS2_FORMAT_FS &&
165 sb->sb_multihost_format == GFS2_FORMAT_MULTI)
166 return 0;
167
168 fs_warn(sdp, "Unknown on-disk format, unable to mount\n");
169
170 return -EINVAL;
171 }
172
173 static void end_bio_io_page(struct bio *bio)
174 {
175 struct page *page = bio->bi_private;
176
177 if (!bio->bi_status)
178 SetPageUptodate(page);
179 else
180 pr_warn("error %d reading superblock\n", bio->bi_status);
181 unlock_page(page);
182 }
183
184 static void gfs2_sb_in(struct gfs2_sbd *sdp, const void *buf)
185 {
186 struct gfs2_sb_host *sb = &sdp->sd_sb;
187 struct super_block *s = sdp->sd_vfs;
188 const struct gfs2_sb *str = buf;
189
190 sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic);
191 sb->sb_type = be32_to_cpu(str->sb_header.mh_type);
192 sb->sb_format = be32_to_cpu(str->sb_header.mh_format);
193 sb->sb_fs_format = be32_to_cpu(str->sb_fs_format);
194 sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format);
195 sb->sb_bsize = be32_to_cpu(str->sb_bsize);
196 sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift);
197 sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr);
198 sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino);
199 sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr);
200 sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino);
201
202 memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN);
203 memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN);
204 memcpy(&s->s_uuid, str->sb_uuid, 16);
205 }
206
207 /**
208 * gfs2_read_super - Read the gfs2 super block from disk
209 * @sdp: The GFS2 super block
210 * @sector: The location of the super block
211 * @error: The error code to return
212 *
213 * This uses the bio functions to read the super block from disk
214 * because we want to be 100% sure that we never read cached data.
215 * A super block is read twice only during each GFS2 mount and is
216 * never written to by the filesystem. The first time its read no
217 * locks are held, and the only details which are looked at are those
218 * relating to the locking protocol. Once locking is up and working,
219 * the sb is read again under the lock to establish the location of
220 * the master directory (contains pointers to journals etc) and the
221 * root directory.
222 *
223 * Returns: 0 on success or error
224 */
225
226 static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector, int silent)
227 {
228 struct super_block *sb = sdp->sd_vfs;
229 struct gfs2_sb *p;
230 struct page *page;
231 struct bio *bio;
232
233 page = alloc_page(GFP_NOFS);
234 if (unlikely(!page))
235 return -ENOMEM;
236
237 ClearPageUptodate(page);
238 ClearPageDirty(page);
239 lock_page(page);
240
241 bio = bio_alloc(GFP_NOFS, 1);
242 bio->bi_iter.bi_sector = sector * (sb->s_blocksize >> 9);
243 bio_set_dev(bio, sb->s_bdev);
244 bio_add_page(bio, page, PAGE_SIZE, 0);
245
246 bio->bi_end_io = end_bio_io_page;
247 bio->bi_private = page;
248 bio_set_op_attrs(bio, REQ_OP_READ, REQ_META);
249 submit_bio(bio);
250 wait_on_page_locked(page);
251 bio_put(bio);
252 if (!PageUptodate(page)) {
253 __free_page(page);
254 return -EIO;
255 }
256 p = kmap(page);
257 gfs2_sb_in(sdp, p);
258 kunmap(page);
259 __free_page(page);
260 return gfs2_check_sb(sdp, silent);
261 }
262
263 /**
264 * gfs2_read_sb - Read super block
265 * @sdp: The GFS2 superblock
266 * @silent: Don't print message if mount fails
267 *
268 */
269
270 static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent)
271 {
272 u32 hash_blocks, ind_blocks, leaf_blocks;
273 u32 tmp_blocks;
274 unsigned int x;
275 int error;
276
277 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
278 if (error) {
279 if (!silent)
280 fs_err(sdp, "can't read superblock\n");
281 return error;
282 }
283
284 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
285 GFS2_BASIC_BLOCK_SHIFT;
286 sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift);
287 sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
288 sizeof(struct gfs2_dinode)) / sizeof(u64);
289 sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
290 sizeof(struct gfs2_meta_header)) / sizeof(u64);
291 sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
292 sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
293 sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
294 sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64);
295 sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
296 sizeof(struct gfs2_meta_header)) /
297 sizeof(struct gfs2_quota_change);
298 sdp->sd_blocks_per_bitmap = (sdp->sd_sb.sb_bsize -
299 sizeof(struct gfs2_meta_header))
300 * GFS2_NBBY; /* not the rgrp bitmap, subsequent bitmaps only */
301
302 /* Compute maximum reservation required to add a entry to a directory */
303
304 hash_blocks = DIV_ROUND_UP(sizeof(u64) * BIT(GFS2_DIR_MAX_DEPTH),
305 sdp->sd_jbsize);
306
307 ind_blocks = 0;
308 for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
309 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
310 ind_blocks += tmp_blocks;
311 }
312
313 leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
314
315 sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
316
317 sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
318 sizeof(struct gfs2_dinode);
319 sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
320 for (x = 2;; x++) {
321 u64 space, d;
322 u32 m;
323
324 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
325 d = space;
326 m = do_div(d, sdp->sd_inptrs);
327
328 if (d != sdp->sd_heightsize[x - 1] || m)
329 break;
330 sdp->sd_heightsize[x] = space;
331 }
332 sdp->sd_max_height = x;
333 sdp->sd_heightsize[x] = ~0;
334 gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
335
336 sdp->sd_max_dents_per_leaf = (sdp->sd_sb.sb_bsize -
337 sizeof(struct gfs2_leaf)) /
338 GFS2_MIN_DIRENT_SIZE;
339 return 0;
340 }
341
342 static int init_names(struct gfs2_sbd *sdp, int silent)
343 {
344 char *proto, *table;
345 int error = 0;
346
347 proto = sdp->sd_args.ar_lockproto;
348 table = sdp->sd_args.ar_locktable;
349
350 /* Try to autodetect */
351
352 if (!proto[0] || !table[0]) {
353 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
354 if (error)
355 return error;
356
357 if (!proto[0])
358 proto = sdp->sd_sb.sb_lockproto;
359 if (!table[0])
360 table = sdp->sd_sb.sb_locktable;
361 }
362
363 if (!table[0])
364 table = sdp->sd_vfs->s_id;
365
366 strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN);
367 strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN);
368
369 table = sdp->sd_table_name;
370 while ((table = strchr(table, '/')))
371 *table = '_';
372
373 return error;
374 }
375
376 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
377 int undo)
378 {
379 int error = 0;
380
381 if (undo)
382 goto fail_trans;
383
384 error = gfs2_glock_nq_num(sdp,
385 GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
386 LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
387 mount_gh);
388 if (error) {
389 fs_err(sdp, "can't acquire mount glock: %d\n", error);
390 goto fail;
391 }
392
393 error = gfs2_glock_nq_num(sdp,
394 GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
395 LM_ST_SHARED,
396 LM_FLAG_NOEXP | GL_EXACT,
397 &sdp->sd_live_gh);
398 if (error) {
399 fs_err(sdp, "can't acquire live glock: %d\n", error);
400 goto fail_mount;
401 }
402
403 error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
404 CREATE, &sdp->sd_rename_gl);
405 if (error) {
406 fs_err(sdp, "can't create rename glock: %d\n", error);
407 goto fail_live;
408 }
409
410 error = gfs2_glock_get(sdp, GFS2_FREEZE_LOCK, &gfs2_freeze_glops,
411 CREATE, &sdp->sd_freeze_gl);
412 if (error) {
413 fs_err(sdp, "can't create transaction glock: %d\n", error);
414 goto fail_rename;
415 }
416
417 return 0;
418
419 fail_trans:
420 gfs2_glock_put(sdp->sd_freeze_gl);
421 fail_rename:
422 gfs2_glock_put(sdp->sd_rename_gl);
423 fail_live:
424 gfs2_glock_dq_uninit(&sdp->sd_live_gh);
425 fail_mount:
426 gfs2_glock_dq_uninit(mount_gh);
427 fail:
428 return error;
429 }
430
431 static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr,
432 u64 no_addr, const char *name)
433 {
434 struct gfs2_sbd *sdp = sb->s_fs_info;
435 struct dentry *dentry;
436 struct inode *inode;
437
438 inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0,
439 GFS2_BLKST_FREE /* ignore */);
440 if (IS_ERR(inode)) {
441 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode));
442 return PTR_ERR(inode);
443 }
444 dentry = d_make_root(inode);
445 if (!dentry) {
446 fs_err(sdp, "can't alloc %s dentry\n", name);
447 return -ENOMEM;
448 }
449 *dptr = dentry;
450 return 0;
451 }
452
453 static int init_sb(struct gfs2_sbd *sdp, int silent)
454 {
455 struct super_block *sb = sdp->sd_vfs;
456 struct gfs2_holder sb_gh;
457 u64 no_addr;
458 int ret;
459
460 ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
461 LM_ST_SHARED, 0, &sb_gh);
462 if (ret) {
463 fs_err(sdp, "can't acquire superblock glock: %d\n", ret);
464 return ret;
465 }
466
467 ret = gfs2_read_sb(sdp, silent);
468 if (ret) {
469 fs_err(sdp, "can't read superblock: %d\n", ret);
470 goto out;
471 }
472
473 /* Set up the buffer cache and SB for real */
474 if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) {
475 ret = -EINVAL;
476 fs_err(sdp, "FS block size (%u) is too small for device "
477 "block size (%u)\n",
478 sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev));
479 goto out;
480 }
481 if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
482 ret = -EINVAL;
483 fs_err(sdp, "FS block size (%u) is too big for machine "
484 "page size (%u)\n",
485 sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
486 goto out;
487 }
488 sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
489
490 /* Get the root inode */
491 no_addr = sdp->sd_sb.sb_root_dir.no_addr;
492 ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root");
493 if (ret)
494 goto out;
495
496 /* Get the master inode */
497 no_addr = sdp->sd_sb.sb_master_dir.no_addr;
498 ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master");
499 if (ret) {
500 dput(sdp->sd_root_dir);
501 goto out;
502 }
503 sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir);
504 out:
505 gfs2_glock_dq_uninit(&sb_gh);
506 return ret;
507 }
508
509 static void gfs2_others_may_mount(struct gfs2_sbd *sdp)
510 {
511 char *message = "FIRSTMOUNT=Done";
512 char *envp[] = { message, NULL };
513
514 fs_info(sdp, "first mount done, others may mount\n");
515
516 if (sdp->sd_lockstruct.ls_ops->lm_first_done)
517 sdp->sd_lockstruct.ls_ops->lm_first_done(sdp);
518
519 kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp);
520 }
521
522 /**
523 * gfs2_jindex_hold - Grab a lock on the jindex
524 * @sdp: The GFS2 superblock
525 * @ji_gh: the holder for the jindex glock
526 *
527 * Returns: errno
528 */
529
530 static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
531 {
532 struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex);
533 struct qstr name;
534 char buf[20];
535 struct gfs2_jdesc *jd;
536 int error;
537
538 name.name = buf;
539
540 mutex_lock(&sdp->sd_jindex_mutex);
541
542 for (;;) {
543 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh);
544 if (error)
545 break;
546
547 name.len = sprintf(buf, "journal%u", sdp->sd_journals);
548 name.hash = gfs2_disk_hash(name.name, name.len);
549
550 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL);
551 if (error == -ENOENT) {
552 error = 0;
553 break;
554 }
555
556 gfs2_glock_dq_uninit(ji_gh);
557
558 if (error)
559 break;
560
561 error = -ENOMEM;
562 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
563 if (!jd)
564 break;
565
566 INIT_LIST_HEAD(&jd->extent_list);
567 INIT_LIST_HEAD(&jd->jd_revoke_list);
568
569 INIT_WORK(&jd->jd_work, gfs2_recover_func);
570 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1);
571 if (!jd->jd_inode || IS_ERR(jd->jd_inode)) {
572 if (!jd->jd_inode)
573 error = -ENOENT;
574 else
575 error = PTR_ERR(jd->jd_inode);
576 kfree(jd);
577 break;
578 }
579
580 spin_lock(&sdp->sd_jindex_spin);
581 jd->jd_jid = sdp->sd_journals++;
582 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
583 spin_unlock(&sdp->sd_jindex_spin);
584 }
585
586 mutex_unlock(&sdp->sd_jindex_mutex);
587
588 return error;
589 }
590
591 /**
592 * check_journal_clean - Make sure a journal is clean for a spectator mount
593 * @sdp: The GFS2 superblock
594 * @jd: The journal descriptor
595 *
596 * Returns: 0 if the journal is clean or locked, else an error
597 */
598 static int check_journal_clean(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd)
599 {
600 int error;
601 struct gfs2_holder j_gh;
602 struct gfs2_log_header_host head;
603 struct gfs2_inode *ip;
604
605 ip = GFS2_I(jd->jd_inode);
606 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_NOEXP |
607 GL_EXACT | GL_NOCACHE, &j_gh);
608 if (error) {
609 fs_err(sdp, "Error locking journal for spectator mount.\n");
610 return -EPERM;
611 }
612 error = gfs2_jdesc_check(jd);
613 if (error) {
614 fs_err(sdp, "Error checking journal for spectator mount.\n");
615 goto out_unlock;
616 }
617 error = gfs2_find_jhead(jd, &head, false);
618 if (error) {
619 fs_err(sdp, "Error parsing journal for spectator mount.\n");
620 goto out_unlock;
621 }
622 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
623 error = -EPERM;
624 fs_err(sdp, "jid=%u: Journal is dirty, so the first mounter "
625 "must not be a spectator.\n", jd->jd_jid);
626 }
627
628 out_unlock:
629 gfs2_glock_dq_uninit(&j_gh);
630 return error;
631 }
632
633 static int init_journal(struct gfs2_sbd *sdp, int undo)
634 {
635 struct inode *master = d_inode(sdp->sd_master_dir);
636 struct gfs2_holder ji_gh;
637 struct gfs2_inode *ip;
638 int jindex = 1;
639 int error = 0;
640
641 if (undo) {
642 jindex = 0;
643 goto fail_jinode_gh;
644 }
645
646 sdp->sd_jindex = gfs2_lookup_simple(master, "jindex");
647 if (IS_ERR(sdp->sd_jindex)) {
648 fs_err(sdp, "can't lookup journal index: %d\n", error);
649 return PTR_ERR(sdp->sd_jindex);
650 }
651
652 /* Load in the journal index special file */
653
654 error = gfs2_jindex_hold(sdp, &ji_gh);
655 if (error) {
656 fs_err(sdp, "can't read journal index: %d\n", error);
657 goto fail;
658 }
659
660 error = -EUSERS;
661 if (!gfs2_jindex_size(sdp)) {
662 fs_err(sdp, "no journals!\n");
663 goto fail_jindex;
664 }
665
666 atomic_set(&sdp->sd_log_blks_needed, 0);
667 if (sdp->sd_args.ar_spectator) {
668 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
669 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
670 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
671 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
672 } else {
673 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
674 fs_err(sdp, "can't mount journal #%u\n",
675 sdp->sd_lockstruct.ls_jid);
676 fs_err(sdp, "there are only %u journals (0 - %u)\n",
677 gfs2_jindex_size(sdp),
678 gfs2_jindex_size(sdp) - 1);
679 goto fail_jindex;
680 }
681 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
682
683 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
684 &gfs2_journal_glops,
685 LM_ST_EXCLUSIVE, LM_FLAG_NOEXP,
686 &sdp->sd_journal_gh);
687 if (error) {
688 fs_err(sdp, "can't acquire journal glock: %d\n", error);
689 goto fail_jindex;
690 }
691
692 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
693 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
694 LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE,
695 &sdp->sd_jinode_gh);
696 if (error) {
697 fs_err(sdp, "can't acquire journal inode glock: %d\n",
698 error);
699 goto fail_journal_gh;
700 }
701
702 error = gfs2_jdesc_check(sdp->sd_jdesc);
703 if (error) {
704 fs_err(sdp, "my journal (%u) is bad: %d\n",
705 sdp->sd_jdesc->jd_jid, error);
706 goto fail_jinode_gh;
707 }
708 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
709 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
710 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
711
712 /* Map the extents for this journal's blocks */
713 gfs2_map_journal_extents(sdp, sdp->sd_jdesc);
714 }
715 trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free));
716
717 if (sdp->sd_lockstruct.ls_first) {
718 unsigned int x;
719 for (x = 0; x < sdp->sd_journals; x++) {
720 struct gfs2_jdesc *jd = gfs2_jdesc_find(sdp, x);
721
722 if (sdp->sd_args.ar_spectator) {
723 error = check_journal_clean(sdp, jd);
724 if (error)
725 goto fail_jinode_gh;
726 continue;
727 }
728 error = gfs2_recover_journal(jd, true);
729 if (error) {
730 fs_err(sdp, "error recovering journal %u: %d\n",
731 x, error);
732 goto fail_jinode_gh;
733 }
734 }
735
736 gfs2_others_may_mount(sdp);
737 } else if (!sdp->sd_args.ar_spectator) {
738 error = gfs2_recover_journal(sdp->sd_jdesc, true);
739 if (error) {
740 fs_err(sdp, "error recovering my journal: %d\n", error);
741 goto fail_jinode_gh;
742 }
743 }
744
745 sdp->sd_log_idle = 1;
746 set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
747 gfs2_glock_dq_uninit(&ji_gh);
748 jindex = 0;
749 INIT_WORK(&sdp->sd_freeze_work, gfs2_freeze_func);
750 return 0;
751
752 fail_jinode_gh:
753 if (!sdp->sd_args.ar_spectator)
754 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
755 fail_journal_gh:
756 if (!sdp->sd_args.ar_spectator)
757 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
758 fail_jindex:
759 gfs2_jindex_free(sdp);
760 if (jindex)
761 gfs2_glock_dq_uninit(&ji_gh);
762 fail:
763 iput(sdp->sd_jindex);
764 return error;
765 }
766
767 static struct lock_class_key gfs2_quota_imutex_key;
768
769 static int init_inodes(struct gfs2_sbd *sdp, int undo)
770 {
771 int error = 0;
772 struct inode *master = d_inode(sdp->sd_master_dir);
773
774 if (undo)
775 goto fail_qinode;
776
777 error = init_journal(sdp, undo);
778 complete_all(&sdp->sd_journal_ready);
779 if (error)
780 goto fail;
781
782 /* Read in the master statfs inode */
783 sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs");
784 if (IS_ERR(sdp->sd_statfs_inode)) {
785 error = PTR_ERR(sdp->sd_statfs_inode);
786 fs_err(sdp, "can't read in statfs inode: %d\n", error);
787 goto fail_journal;
788 }
789
790 /* Read in the resource index inode */
791 sdp->sd_rindex = gfs2_lookup_simple(master, "rindex");
792 if (IS_ERR(sdp->sd_rindex)) {
793 error = PTR_ERR(sdp->sd_rindex);
794 fs_err(sdp, "can't get resource index inode: %d\n", error);
795 goto fail_statfs;
796 }
797 sdp->sd_rindex_uptodate = 0;
798
799 /* Read in the quota inode */
800 sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota");
801 if (IS_ERR(sdp->sd_quota_inode)) {
802 error = PTR_ERR(sdp->sd_quota_inode);
803 fs_err(sdp, "can't get quota file inode: %d\n", error);
804 goto fail_rindex;
805 }
806 /*
807 * i_rwsem on quota files is special. Since this inode is hidden system
808 * file, we are safe to define locking ourselves.
809 */
810 lockdep_set_class(&sdp->sd_quota_inode->i_rwsem,
811 &gfs2_quota_imutex_key);
812
813 error = gfs2_rindex_update(sdp);
814 if (error)
815 goto fail_qinode;
816
817 return 0;
818
819 fail_qinode:
820 iput(sdp->sd_quota_inode);
821 fail_rindex:
822 gfs2_clear_rgrpd(sdp);
823 iput(sdp->sd_rindex);
824 fail_statfs:
825 iput(sdp->sd_statfs_inode);
826 fail_journal:
827 init_journal(sdp, UNDO);
828 fail:
829 return error;
830 }
831
832 static int init_per_node(struct gfs2_sbd *sdp, int undo)
833 {
834 struct inode *pn = NULL;
835 char buf[30];
836 int error = 0;
837 struct gfs2_inode *ip;
838 struct inode *master = d_inode(sdp->sd_master_dir);
839
840 if (sdp->sd_args.ar_spectator)
841 return 0;
842
843 if (undo)
844 goto fail_qc_gh;
845
846 pn = gfs2_lookup_simple(master, "per_node");
847 if (IS_ERR(pn)) {
848 error = PTR_ERR(pn);
849 fs_err(sdp, "can't find per_node directory: %d\n", error);
850 return error;
851 }
852
853 sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid);
854 sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf);
855 if (IS_ERR(sdp->sd_sc_inode)) {
856 error = PTR_ERR(sdp->sd_sc_inode);
857 fs_err(sdp, "can't find local \"sc\" file: %d\n", error);
858 goto fail;
859 }
860
861 sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
862 sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
863 if (IS_ERR(sdp->sd_qc_inode)) {
864 error = PTR_ERR(sdp->sd_qc_inode);
865 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
866 goto fail_ut_i;
867 }
868
869 iput(pn);
870 pn = NULL;
871
872 ip = GFS2_I(sdp->sd_sc_inode);
873 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
874 &sdp->sd_sc_gh);
875 if (error) {
876 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
877 goto fail_qc_i;
878 }
879
880 ip = GFS2_I(sdp->sd_qc_inode);
881 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
882 &sdp->sd_qc_gh);
883 if (error) {
884 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
885 goto fail_ut_gh;
886 }
887
888 return 0;
889
890 fail_qc_gh:
891 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
892 fail_ut_gh:
893 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
894 fail_qc_i:
895 iput(sdp->sd_qc_inode);
896 fail_ut_i:
897 iput(sdp->sd_sc_inode);
898 fail:
899 iput(pn);
900 return error;
901 }
902
903 static const match_table_t nolock_tokens = {
904 { Opt_jid, "jid=%d\n", },
905 { Opt_err, NULL },
906 };
907
908 static const struct lm_lockops nolock_ops = {
909 .lm_proto_name = "lock_nolock",
910 .lm_put_lock = gfs2_glock_free,
911 .lm_tokens = &nolock_tokens,
912 };
913
914 /**
915 * gfs2_lm_mount - mount a locking protocol
916 * @sdp: the filesystem
917 * @args: mount arguments
918 * @silent: if 1, don't complain if the FS isn't a GFS2 fs
919 *
920 * Returns: errno
921 */
922
923 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
924 {
925 const struct lm_lockops *lm;
926 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
927 struct gfs2_args *args = &sdp->sd_args;
928 const char *proto = sdp->sd_proto_name;
929 const char *table = sdp->sd_table_name;
930 char *o, *options;
931 int ret;
932
933 if (!strcmp("lock_nolock", proto)) {
934 lm = &nolock_ops;
935 sdp->sd_args.ar_localflocks = 1;
936 #ifdef CONFIG_GFS2_FS_LOCKING_DLM
937 } else if (!strcmp("lock_dlm", proto)) {
938 lm = &gfs2_dlm_ops;
939 #endif
940 } else {
941 pr_info("can't find protocol %s\n", proto);
942 return -ENOENT;
943 }
944
945 fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);
946
947 ls->ls_ops = lm;
948 ls->ls_first = 1;
949
950 for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) {
951 substring_t tmp[MAX_OPT_ARGS];
952 int token, option;
953
954 if (!o || !*o)
955 continue;
956
957 token = match_token(o, *lm->lm_tokens, tmp);
958 switch (token) {
959 case Opt_jid:
960 ret = match_int(&tmp[0], &option);
961 if (ret || option < 0)
962 goto hostdata_error;
963 if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags))
964 ls->ls_jid = option;
965 break;
966 case Opt_id:
967 case Opt_nodir:
968 /* Obsolete, but left for backward compat purposes */
969 break;
970 case Opt_first:
971 ret = match_int(&tmp[0], &option);
972 if (ret || (option != 0 && option != 1))
973 goto hostdata_error;
974 ls->ls_first = option;
975 break;
976 case Opt_err:
977 default:
978 hostdata_error:
979 fs_info(sdp, "unknown hostdata (%s)\n", o);
980 return -EINVAL;
981 }
982 }
983
984 if (lm->lm_mount == NULL) {
985 fs_info(sdp, "Now mounting FS...\n");
986 complete_all(&sdp->sd_locking_init);
987 return 0;
988 }
989 ret = lm->lm_mount(sdp, table);
990 if (ret == 0)
991 fs_info(sdp, "Joined cluster. Now mounting FS...\n");
992 complete_all(&sdp->sd_locking_init);
993 return ret;
994 }
995
996 void gfs2_lm_unmount(struct gfs2_sbd *sdp)
997 {
998 const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops;
999 if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) &&
1000 lm->lm_unmount)
1001 lm->lm_unmount(sdp);
1002 }
1003
1004 static int wait_on_journal(struct gfs2_sbd *sdp)
1005 {
1006 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
1007 return 0;
1008
1009 return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, TASK_INTERRUPTIBLE)
1010 ? -EINTR : 0;
1011 }
1012
1013 void gfs2_online_uevent(struct gfs2_sbd *sdp)
1014 {
1015 struct super_block *sb = sdp->sd_vfs;
1016 char ro[20];
1017 char spectator[20];
1018 char *envp[] = { ro, spectator, NULL };
1019 sprintf(ro, "RDONLY=%d", sb_rdonly(sb));
1020 sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
1021 kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp);
1022 }
1023
1024 /**
1025 * fill_super - Read in superblock
1026 * @sb: The VFS superblock
1027 * @data: Mount options
1028 * @silent: Don't complain if it's not a GFS2 filesystem
1029 *
1030 * Returns: errno
1031 */
1032
1033 static int fill_super(struct super_block *sb, struct gfs2_args *args, int silent)
1034 {
1035 struct gfs2_sbd *sdp;
1036 struct gfs2_holder mount_gh;
1037 int error;
1038
1039 sdp = init_sbd(sb);
1040 if (!sdp) {
1041 pr_warn("can't alloc struct gfs2_sbd\n");
1042 return -ENOMEM;
1043 }
1044 sdp->sd_args = *args;
1045
1046 if (sdp->sd_args.ar_spectator) {
1047 sb->s_flags |= SB_RDONLY;
1048 set_bit(SDF_RORECOVERY, &sdp->sd_flags);
1049 }
1050 if (sdp->sd_args.ar_posix_acl)
1051 sb->s_flags |= SB_POSIXACL;
1052 if (sdp->sd_args.ar_nobarrier)
1053 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1054
1055 sb->s_flags |= SB_NOSEC;
1056 sb->s_magic = GFS2_MAGIC;
1057 sb->s_op = &gfs2_super_ops;
1058 sb->s_d_op = &gfs2_dops;
1059 sb->s_export_op = &gfs2_export_ops;
1060 sb->s_xattr = gfs2_xattr_handlers;
1061 sb->s_qcop = &gfs2_quotactl_ops;
1062 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1063 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
1064 sb->s_time_gran = 1;
1065 sb->s_maxbytes = MAX_LFS_FILESIZE;
1066
1067 /* Set up the buffer cache and fill in some fake block size values
1068 to allow us to read-in the on-disk superblock. */
1069 sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
1070 sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
1071 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
1072 GFS2_BASIC_BLOCK_SHIFT;
1073 sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift);
1074
1075 sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit;
1076 sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum;
1077 if (sdp->sd_args.ar_statfs_quantum) {
1078 sdp->sd_tune.gt_statfs_slow = 0;
1079 sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum;
1080 } else {
1081 sdp->sd_tune.gt_statfs_slow = 1;
1082 sdp->sd_tune.gt_statfs_quantum = 30;
1083 }
1084
1085 error = init_names(sdp, silent);
1086 if (error) {
1087 /* In this case, we haven't initialized sysfs, so we have to
1088 manually free the sdp. */
1089 free_percpu(sdp->sd_lkstats);
1090 kfree(sdp);
1091 sb->s_fs_info = NULL;
1092 return error;
1093 }
1094
1095 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s", sdp->sd_table_name);
1096
1097 error = gfs2_sys_fs_add(sdp);
1098 /*
1099 * If we hit an error here, gfs2_sys_fs_add will have called function
1100 * kobject_put which causes the sysfs usage count to go to zero, which
1101 * causes sysfs to call function gfs2_sbd_release, which frees sdp.
1102 * Subsequent error paths here will call gfs2_sys_fs_del, which also
1103 * kobject_put to free sdp.
1104 */
1105 if (error)
1106 return error;
1107
1108 gfs2_create_debugfs_file(sdp);
1109
1110 error = gfs2_lm_mount(sdp, silent);
1111 if (error)
1112 goto fail_debug;
1113
1114 error = init_locking(sdp, &mount_gh, DO);
1115 if (error)
1116 goto fail_lm;
1117
1118 error = init_sb(sdp, silent);
1119 if (error)
1120 goto fail_locking;
1121
1122 error = wait_on_journal(sdp);
1123 if (error)
1124 goto fail_sb;
1125
1126 /*
1127 * If user space has failed to join the cluster or some similar
1128 * failure has occurred, then the journal id will contain a
1129 * negative (error) number. This will then be returned to the
1130 * caller (of the mount syscall). We do this even for spectator
1131 * mounts (which just write a jid of 0 to indicate "ok" even though
1132 * the jid is unused in the spectator case)
1133 */
1134 if (sdp->sd_lockstruct.ls_jid < 0) {
1135 error = sdp->sd_lockstruct.ls_jid;
1136 sdp->sd_lockstruct.ls_jid = 0;
1137 goto fail_sb;
1138 }
1139
1140 if (sdp->sd_args.ar_spectator)
1141 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.s",
1142 sdp->sd_table_name);
1143 else
1144 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.%u",
1145 sdp->sd_table_name, sdp->sd_lockstruct.ls_jid);
1146
1147 error = init_inodes(sdp, DO);
1148 if (error)
1149 goto fail_sb;
1150
1151 error = init_per_node(sdp, DO);
1152 if (error)
1153 goto fail_inodes;
1154
1155 error = gfs2_statfs_init(sdp);
1156 if (error) {
1157 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
1158 goto fail_per_node;
1159 }
1160
1161 if (!sb_rdonly(sb)) {
1162 error = gfs2_make_fs_rw(sdp);
1163 if (error) {
1164 fs_err(sdp, "can't make FS RW: %d\n", error);
1165 goto fail_per_node;
1166 }
1167 }
1168
1169 gfs2_glock_dq_uninit(&mount_gh);
1170 gfs2_online_uevent(sdp);
1171 return 0;
1172
1173 fail_per_node:
1174 init_per_node(sdp, UNDO);
1175 fail_inodes:
1176 init_inodes(sdp, UNDO);
1177 fail_sb:
1178 if (sdp->sd_root_dir)
1179 dput(sdp->sd_root_dir);
1180 if (sdp->sd_master_dir)
1181 dput(sdp->sd_master_dir);
1182 if (sb->s_root)
1183 dput(sb->s_root);
1184 sb->s_root = NULL;
1185 fail_locking:
1186 init_locking(sdp, &mount_gh, UNDO);
1187 fail_lm:
1188 complete_all(&sdp->sd_journal_ready);
1189 gfs2_gl_hash_clear(sdp);
1190 gfs2_lm_unmount(sdp);
1191 fail_debug:
1192 gfs2_delete_debugfs_file(sdp);
1193 free_percpu(sdp->sd_lkstats);
1194 /* gfs2_sys_fs_del must be the last thing we do, since it causes
1195 * sysfs to call function gfs2_sbd_release, which frees sdp. */
1196 gfs2_sys_fs_del(sdp);
1197 sb->s_fs_info = NULL;
1198 return error;
1199 }
1200
1201 static int set_gfs2_super(struct super_block *s, void *data)
1202 {
1203 s->s_bdev = data;
1204 s->s_dev = s->s_bdev->bd_dev;
1205 s->s_bdi = bdi_get(s->s_bdev->bd_bdi);
1206 return 0;
1207 }
1208
1209 static int test_gfs2_super(struct super_block *s, void *ptr)
1210 {
1211 struct block_device *bdev = ptr;
1212 return (bdev == s->s_bdev);
1213 }
1214
1215 /**
1216 * gfs2_mount - Get the GFS2 superblock
1217 * @fs_type: The GFS2 filesystem type
1218 * @flags: Mount flags
1219 * @dev_name: The name of the device
1220 * @data: The mount arguments
1221 *
1222 * Q. Why not use get_sb_bdev() ?
1223 * A. We need to select one of two root directories to mount, independent
1224 * of whether this is the initial, or subsequent, mount of this sb
1225 *
1226 * Returns: 0 or -ve on error
1227 */
1228
1229 static struct dentry *gfs2_mount(struct file_system_type *fs_type, int flags,
1230 const char *dev_name, void *data)
1231 {
1232 struct block_device *bdev;
1233 struct super_block *s;
1234 fmode_t mode = FMODE_READ | FMODE_EXCL;
1235 int error;
1236 struct gfs2_args args;
1237 struct gfs2_sbd *sdp;
1238
1239 if (!(flags & SB_RDONLY))
1240 mode |= FMODE_WRITE;
1241
1242 bdev = blkdev_get_by_path(dev_name, mode, fs_type);
1243 if (IS_ERR(bdev))
1244 return ERR_CAST(bdev);
1245
1246 /*
1247 * once the super is inserted into the list by sget, s_umount
1248 * will protect the lockfs code from trying to start a snapshot
1249 * while we are mounting
1250 */
1251 mutex_lock(&bdev->bd_fsfreeze_mutex);
1252 if (bdev->bd_fsfreeze_count > 0) {
1253 mutex_unlock(&bdev->bd_fsfreeze_mutex);
1254 error = -EBUSY;
1255 goto error_bdev;
1256 }
1257 s = sget(fs_type, test_gfs2_super, set_gfs2_super, flags, bdev);
1258 mutex_unlock(&bdev->bd_fsfreeze_mutex);
1259 error = PTR_ERR(s);
1260 if (IS_ERR(s))
1261 goto error_bdev;
1262
1263 if (s->s_root) {
1264 /*
1265 * s_umount nests inside bd_mutex during
1266 * __invalidate_device(). blkdev_put() acquires
1267 * bd_mutex and can't be called under s_umount. Drop
1268 * s_umount temporarily. This is safe as we're
1269 * holding an active reference.
1270 */
1271 up_write(&s->s_umount);
1272 blkdev_put(bdev, mode);
1273 down_write(&s->s_umount);
1274 } else {
1275 /* s_mode must be set before deactivate_locked_super calls */
1276 s->s_mode = mode;
1277 }
1278
1279 memset(&args, 0, sizeof(args));
1280 args.ar_quota = GFS2_QUOTA_DEFAULT;
1281 args.ar_data = GFS2_DATA_DEFAULT;
1282 args.ar_commit = 30;
1283 args.ar_statfs_quantum = 30;
1284 args.ar_quota_quantum = 60;
1285 args.ar_errors = GFS2_ERRORS_DEFAULT;
1286
1287 error = gfs2_mount_args(&args, data);
1288 if (error) {
1289 pr_warn("can't parse mount arguments\n");
1290 goto error_super;
1291 }
1292
1293 if (s->s_root) {
1294 error = -EBUSY;
1295 if ((flags ^ s->s_flags) & SB_RDONLY)
1296 goto error_super;
1297 } else {
1298 snprintf(s->s_id, sizeof(s->s_id), "%pg", bdev);
1299 sb_set_blocksize(s, block_size(bdev));
1300 error = fill_super(s, &args, flags & SB_SILENT ? 1 : 0);
1301 if (error)
1302 goto error_super;
1303 s->s_flags |= SB_ACTIVE;
1304 bdev->bd_super = s;
1305 }
1306
1307 sdp = s->s_fs_info;
1308 if (args.ar_meta)
1309 return dget(sdp->sd_master_dir);
1310 else
1311 return dget(sdp->sd_root_dir);
1312
1313 error_super:
1314 deactivate_locked_super(s);
1315 return ERR_PTR(error);
1316 error_bdev:
1317 blkdev_put(bdev, mode);
1318 return ERR_PTR(error);
1319 }
1320
1321 static int set_meta_super(struct super_block *s, void *ptr)
1322 {
1323 return -EINVAL;
1324 }
1325
1326 static struct dentry *gfs2_mount_meta(struct file_system_type *fs_type,
1327 int flags, const char *dev_name, void *data)
1328 {
1329 struct super_block *s;
1330 struct gfs2_sbd *sdp;
1331 struct path path;
1332 int error;
1333
1334 if (!dev_name || !*dev_name)
1335 return ERR_PTR(-EINVAL);
1336
1337 error = kern_path(dev_name, LOOKUP_FOLLOW, &path);
1338 if (error) {
1339 pr_warn("path_lookup on %s returned error %d\n",
1340 dev_name, error);
1341 return ERR_PTR(error);
1342 }
1343 s = sget(&gfs2_fs_type, test_gfs2_super, set_meta_super, flags,
1344 path.dentry->d_sb->s_bdev);
1345 path_put(&path);
1346 if (IS_ERR(s)) {
1347 pr_warn("gfs2 mount does not exist\n");
1348 return ERR_CAST(s);
1349 }
1350 if ((flags ^ s->s_flags) & SB_RDONLY) {
1351 deactivate_locked_super(s);
1352 return ERR_PTR(-EBUSY);
1353 }
1354 sdp = s->s_fs_info;
1355 return dget(sdp->sd_master_dir);
1356 }
1357
1358 static void gfs2_kill_sb(struct super_block *sb)
1359 {
1360 struct gfs2_sbd *sdp = sb->s_fs_info;
1361
1362 if (sdp == NULL) {
1363 kill_block_super(sb);
1364 return;
1365 }
1366
1367 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SYNC | GFS2_LFC_KILL_SB);
1368 dput(sdp->sd_root_dir);
1369 dput(sdp->sd_master_dir);
1370 sdp->sd_root_dir = NULL;
1371 sdp->sd_master_dir = NULL;
1372 shrink_dcache_sb(sb);
1373 free_percpu(sdp->sd_lkstats);
1374 kill_block_super(sb);
1375 }
1376
1377 struct file_system_type gfs2_fs_type = {
1378 .name = "gfs2",
1379 .fs_flags = FS_REQUIRES_DEV,
1380 .mount = gfs2_mount,
1381 .kill_sb = gfs2_kill_sb,
1382 .owner = THIS_MODULE,
1383 };
1384 MODULE_ALIAS_FS("gfs2");
1385
1386 struct file_system_type gfs2meta_fs_type = {
1387 .name = "gfs2meta",
1388 .fs_flags = FS_REQUIRES_DEV,
1389 .mount = gfs2_mount_meta,
1390 .owner = THIS_MODULE,
1391 };
1392 MODULE_ALIAS_FS("gfs2meta");
1393
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