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Merge tag 'hyperv-next-signed-20210831' of git://git.kernel.org/pub/scm/linux/kernel...
[mirror_ubuntu-jammy-kernel.git] / fs / gfs2 / ops_fstype.c
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
53 static void gfs2_tune_init(struct gfs2_tune *gt)
54 {
55 spin_lock_init(&gt->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
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
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_glock_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 INIT_LIST_HEAD(&sdp->sd_trunc_list);
110 spin_lock_init(&sdp->sd_trunc_lock);
111 spin_lock_init(&sdp->sd_bitmap_lock);
112
113 INIT_LIST_HEAD(&sdp->sd_sc_inodes_list);
114
115 mapping = &sdp->sd_aspace;
116
117 address_space_init_once(mapping);
118 mapping->a_ops = &gfs2_rgrp_aops;
119 mapping->host = sb->s_bdev->bd_inode;
120 mapping->flags = 0;
121 mapping_set_gfp_mask(mapping, GFP_NOFS);
122 mapping->private_data = NULL;
123 mapping->writeback_index = 0;
124
125 spin_lock_init(&sdp->sd_log_lock);
126 atomic_set(&sdp->sd_log_pinned, 0);
127 INIT_LIST_HEAD(&sdp->sd_log_revokes);
128 INIT_LIST_HEAD(&sdp->sd_log_ordered);
129 spin_lock_init(&sdp->sd_ordered_lock);
130
131 init_waitqueue_head(&sdp->sd_log_waitq);
132 init_waitqueue_head(&sdp->sd_logd_waitq);
133 spin_lock_init(&sdp->sd_ail_lock);
134 INIT_LIST_HEAD(&sdp->sd_ail1_list);
135 INIT_LIST_HEAD(&sdp->sd_ail2_list);
136
137 init_rwsem(&sdp->sd_log_flush_lock);
138 atomic_set(&sdp->sd_log_in_flight, 0);
139 init_waitqueue_head(&sdp->sd_log_flush_wait);
140 atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN);
141 mutex_init(&sdp->sd_freeze_mutex);
142
143 return sdp;
144
145 fail:
146 free_sbd(sdp);
147 return NULL;
148 }
149
150 /**
151 * gfs2_check_sb - Check superblock
152 * @sdp: the filesystem
153 * @silent: Don't print a message if the check fails
154 *
155 * Checks the version code of the FS is one that we understand how to
156 * read and that the sizes of the various on-disk structures have not
157 * changed.
158 */
159
160 static int gfs2_check_sb(struct gfs2_sbd *sdp, int silent)
161 {
162 struct gfs2_sb_host *sb = &sdp->sd_sb;
163
164 if (sb->sb_magic != GFS2_MAGIC ||
165 sb->sb_type != GFS2_METATYPE_SB) {
166 if (!silent)
167 pr_warn("not a GFS2 filesystem\n");
168 return -EINVAL;
169 }
170
171 if (sb->sb_fs_format < GFS2_FS_FORMAT_MIN ||
172 sb->sb_fs_format > GFS2_FS_FORMAT_MAX ||
173 sb->sb_multihost_format != GFS2_FORMAT_MULTI) {
174 fs_warn(sdp, "Unknown on-disk format, unable to mount\n");
175 return -EINVAL;
176 }
177
178 if (sb->sb_bsize < 512 || sb->sb_bsize > PAGE_SIZE ||
179 (sb->sb_bsize & (sb->sb_bsize - 1))) {
180 pr_warn("Invalid block size\n");
181 return -EINVAL;
182 }
183
184 return 0;
185 }
186
187 static void end_bio_io_page(struct bio *bio)
188 {
189 struct page *page = bio->bi_private;
190
191 if (!bio->bi_status)
192 SetPageUptodate(page);
193 else
194 pr_warn("error %d reading superblock\n", bio->bi_status);
195 unlock_page(page);
196 }
197
198 static void gfs2_sb_in(struct gfs2_sbd *sdp, const void *buf)
199 {
200 struct gfs2_sb_host *sb = &sdp->sd_sb;
201 struct super_block *s = sdp->sd_vfs;
202 const struct gfs2_sb *str = buf;
203
204 sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic);
205 sb->sb_type = be32_to_cpu(str->sb_header.mh_type);
206 sb->sb_fs_format = be32_to_cpu(str->sb_fs_format);
207 sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format);
208 sb->sb_bsize = be32_to_cpu(str->sb_bsize);
209 sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift);
210 sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr);
211 sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino);
212 sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr);
213 sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino);
214
215 memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN);
216 memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN);
217 memcpy(&s->s_uuid, str->sb_uuid, 16);
218 }
219
220 /**
221 * gfs2_read_super - Read the gfs2 super block from disk
222 * @sdp: The GFS2 super block
223 * @sector: The location of the super block
224 * @silent: Don't print a message if the check fails
225 *
226 * This uses the bio functions to read the super block from disk
227 * because we want to be 100% sure that we never read cached data.
228 * A super block is read twice only during each GFS2 mount and is
229 * never written to by the filesystem. The first time its read no
230 * locks are held, and the only details which are looked at are those
231 * relating to the locking protocol. Once locking is up and working,
232 * the sb is read again under the lock to establish the location of
233 * the master directory (contains pointers to journals etc) and the
234 * root directory.
235 *
236 * Returns: 0 on success or error
237 */
238
239 static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector, int silent)
240 {
241 struct super_block *sb = sdp->sd_vfs;
242 struct gfs2_sb *p;
243 struct page *page;
244 struct bio *bio;
245
246 page = alloc_page(GFP_NOFS);
247 if (unlikely(!page))
248 return -ENOMEM;
249
250 ClearPageUptodate(page);
251 ClearPageDirty(page);
252 lock_page(page);
253
254 bio = bio_alloc(GFP_NOFS, 1);
255 bio->bi_iter.bi_sector = sector * (sb->s_blocksize >> 9);
256 bio_set_dev(bio, sb->s_bdev);
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 bio_set_op_attrs(bio, REQ_OP_READ, REQ_META);
262 submit_bio(bio);
263 wait_on_page_locked(page);
264 bio_put(bio);
265 if (!PageUptodate(page)) {
266 __free_page(page);
267 return -EIO;
268 }
269 p = kmap(page);
270 gfs2_sb_in(sdp, p);
271 kunmap(page);
272 __free_page(page);
273 return gfs2_check_sb(sdp, silent);
274 }
275
276 /**
277 * gfs2_read_sb - Read super block
278 * @sdp: The GFS2 superblock
279 * @silent: Don't print message if mount fails
280 *
281 */
282
283 static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent)
284 {
285 u32 hash_blocks, ind_blocks, leaf_blocks;
286 u32 tmp_blocks;
287 unsigned int x;
288 int error;
289
290 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
291 if (error) {
292 if (!silent)
293 fs_err(sdp, "can't read superblock\n");
294 return error;
295 }
296
297 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
298 GFS2_BASIC_BLOCK_SHIFT;
299 sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift);
300 sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
301 sizeof(struct gfs2_dinode)) / sizeof(u64);
302 sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
303 sizeof(struct gfs2_meta_header)) / sizeof(u64);
304 sdp->sd_ldptrs = (sdp->sd_sb.sb_bsize -
305 sizeof(struct gfs2_log_descriptor)) / sizeof(u64);
306 sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
307 sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
308 sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
309 sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64);
310 sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
311 sizeof(struct gfs2_meta_header)) /
312 sizeof(struct gfs2_quota_change);
313 sdp->sd_blocks_per_bitmap = (sdp->sd_sb.sb_bsize -
314 sizeof(struct gfs2_meta_header))
315 * GFS2_NBBY; /* not the rgrp bitmap, subsequent bitmaps only */
316
317 /*
318 * We always keep at least one block reserved for revokes in
319 * transactions. This greatly simplifies allocating additional
320 * revoke blocks.
321 */
322 atomic_set(&sdp->sd_log_revokes_available, sdp->sd_ldptrs);
323
324 /* Compute maximum reservation required to add a entry to a directory */
325
326 hash_blocks = DIV_ROUND_UP(sizeof(u64) * BIT(GFS2_DIR_MAX_DEPTH),
327 sdp->sd_jbsize);
328
329 ind_blocks = 0;
330 for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
331 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
332 ind_blocks += tmp_blocks;
333 }
334
335 leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
336
337 sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
338
339 sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
340 sizeof(struct gfs2_dinode);
341 sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
342 for (x = 2;; x++) {
343 u64 space, d;
344 u32 m;
345
346 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
347 d = space;
348 m = do_div(d, sdp->sd_inptrs);
349
350 if (d != sdp->sd_heightsize[x - 1] || m)
351 break;
352 sdp->sd_heightsize[x] = space;
353 }
354 sdp->sd_max_height = x;
355 sdp->sd_heightsize[x] = ~0;
356 gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
357
358 sdp->sd_max_dents_per_leaf = (sdp->sd_sb.sb_bsize -
359 sizeof(struct gfs2_leaf)) /
360 GFS2_MIN_DIRENT_SIZE;
361 return 0;
362 }
363
364 static int init_names(struct gfs2_sbd *sdp, int silent)
365 {
366 char *proto, *table;
367 int error = 0;
368
369 proto = sdp->sd_args.ar_lockproto;
370 table = sdp->sd_args.ar_locktable;
371
372 /* Try to autodetect */
373
374 if (!proto[0] || !table[0]) {
375 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
376 if (error)
377 return error;
378
379 if (!proto[0])
380 proto = sdp->sd_sb.sb_lockproto;
381 if (!table[0])
382 table = sdp->sd_sb.sb_locktable;
383 }
384
385 if (!table[0])
386 table = sdp->sd_vfs->s_id;
387
388 strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN);
389 strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN);
390
391 table = sdp->sd_table_name;
392 while ((table = strchr(table, '/')))
393 *table = '_';
394
395 return error;
396 }
397
398 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
399 int undo)
400 {
401 int error = 0;
402
403 if (undo)
404 goto fail_trans;
405
406 error = gfs2_glock_nq_num(sdp,
407 GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
408 LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
409 mount_gh);
410 if (error) {
411 fs_err(sdp, "can't acquire mount glock: %d\n", error);
412 goto fail;
413 }
414
415 error = gfs2_glock_nq_num(sdp,
416 GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
417 LM_ST_SHARED,
418 LM_FLAG_NOEXP | GL_EXACT,
419 &sdp->sd_live_gh);
420 if (error) {
421 fs_err(sdp, "can't acquire live glock: %d\n", error);
422 goto fail_mount;
423 }
424
425 error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
426 CREATE, &sdp->sd_rename_gl);
427 if (error) {
428 fs_err(sdp, "can't create rename glock: %d\n", error);
429 goto fail_live;
430 }
431
432 error = gfs2_glock_get(sdp, GFS2_FREEZE_LOCK, &gfs2_freeze_glops,
433 CREATE, &sdp->sd_freeze_gl);
434 if (error) {
435 fs_err(sdp, "can't create transaction glock: %d\n", error);
436 goto fail_rename;
437 }
438
439 return 0;
440
441 fail_trans:
442 gfs2_glock_put(sdp->sd_freeze_gl);
443 fail_rename:
444 gfs2_glock_put(sdp->sd_rename_gl);
445 fail_live:
446 gfs2_glock_dq_uninit(&sdp->sd_live_gh);
447 fail_mount:
448 gfs2_glock_dq_uninit(mount_gh);
449 fail:
450 return error;
451 }
452
453 static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr,
454 u64 no_addr, const char *name)
455 {
456 struct gfs2_sbd *sdp = sb->s_fs_info;
457 struct dentry *dentry;
458 struct inode *inode;
459
460 inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0,
461 GFS2_BLKST_FREE /* ignore */);
462 if (IS_ERR(inode)) {
463 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode));
464 return PTR_ERR(inode);
465 }
466 dentry = d_make_root(inode);
467 if (!dentry) {
468 fs_err(sdp, "can't alloc %s dentry\n", name);
469 return -ENOMEM;
470 }
471 *dptr = dentry;
472 return 0;
473 }
474
475 static int init_sb(struct gfs2_sbd *sdp, int silent)
476 {
477 struct super_block *sb = sdp->sd_vfs;
478 struct gfs2_holder sb_gh;
479 u64 no_addr;
480 int ret;
481
482 ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
483 LM_ST_SHARED, 0, &sb_gh);
484 if (ret) {
485 fs_err(sdp, "can't acquire superblock glock: %d\n", ret);
486 return ret;
487 }
488
489 ret = gfs2_read_sb(sdp, silent);
490 if (ret) {
491 fs_err(sdp, "can't read superblock: %d\n", ret);
492 goto out;
493 }
494
495 switch(sdp->sd_sb.sb_fs_format) {
496 case GFS2_FS_FORMAT_MAX:
497 sb->s_xattr = gfs2_xattr_handlers_max;
498 break;
499
500 case GFS2_FS_FORMAT_MIN:
501 sb->s_xattr = gfs2_xattr_handlers_min;
502 break;
503
504 default:
505 BUG();
506 }
507
508 /* Set up the buffer cache and SB for real */
509 if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) {
510 ret = -EINVAL;
511 fs_err(sdp, "FS block size (%u) is too small for device "
512 "block size (%u)\n",
513 sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev));
514 goto out;
515 }
516 if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
517 ret = -EINVAL;
518 fs_err(sdp, "FS block size (%u) is too big for machine "
519 "page size (%u)\n",
520 sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
521 goto out;
522 }
523 sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
524
525 /* Get the root inode */
526 no_addr = sdp->sd_sb.sb_root_dir.no_addr;
527 ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root");
528 if (ret)
529 goto out;
530
531 /* Get the master inode */
532 no_addr = sdp->sd_sb.sb_master_dir.no_addr;
533 ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master");
534 if (ret) {
535 dput(sdp->sd_root_dir);
536 goto out;
537 }
538 sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir);
539 out:
540 gfs2_glock_dq_uninit(&sb_gh);
541 return ret;
542 }
543
544 static void gfs2_others_may_mount(struct gfs2_sbd *sdp)
545 {
546 char *message = "FIRSTMOUNT=Done";
547 char *envp[] = { message, NULL };
548
549 fs_info(sdp, "first mount done, others may mount\n");
550
551 if (sdp->sd_lockstruct.ls_ops->lm_first_done)
552 sdp->sd_lockstruct.ls_ops->lm_first_done(sdp);
553
554 kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp);
555 }
556
557 /**
558 * gfs2_jindex_hold - Grab a lock on the jindex
559 * @sdp: The GFS2 superblock
560 * @ji_gh: the holder for the jindex glock
561 *
562 * Returns: errno
563 */
564
565 static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
566 {
567 struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex);
568 struct qstr name;
569 char buf[20];
570 struct gfs2_jdesc *jd;
571 int error;
572
573 name.name = buf;
574
575 mutex_lock(&sdp->sd_jindex_mutex);
576
577 for (;;) {
578 struct gfs2_inode *jip;
579
580 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh);
581 if (error)
582 break;
583
584 name.len = sprintf(buf, "journal%u", sdp->sd_journals);
585 name.hash = gfs2_disk_hash(name.name, name.len);
586
587 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL);
588 if (error == -ENOENT) {
589 error = 0;
590 break;
591 }
592
593 gfs2_glock_dq_uninit(ji_gh);
594
595 if (error)
596 break;
597
598 error = -ENOMEM;
599 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
600 if (!jd)
601 break;
602
603 INIT_LIST_HEAD(&jd->extent_list);
604 INIT_LIST_HEAD(&jd->jd_revoke_list);
605
606 INIT_WORK(&jd->jd_work, gfs2_recover_func);
607 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1);
608 if (IS_ERR_OR_NULL(jd->jd_inode)) {
609 if (!jd->jd_inode)
610 error = -ENOENT;
611 else
612 error = PTR_ERR(jd->jd_inode);
613 kfree(jd);
614 break;
615 }
616
617 d_mark_dontcache(jd->jd_inode);
618 spin_lock(&sdp->sd_jindex_spin);
619 jd->jd_jid = sdp->sd_journals++;
620 jip = GFS2_I(jd->jd_inode);
621 jd->jd_no_addr = jip->i_no_addr;
622 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
623 spin_unlock(&sdp->sd_jindex_spin);
624 }
625
626 mutex_unlock(&sdp->sd_jindex_mutex);
627
628 return error;
629 }
630
631 /**
632 * init_statfs - look up and initialize master and local (per node) statfs inodes
633 * @sdp: The GFS2 superblock
634 *
635 * This should be called after the jindex is initialized in init_journal() and
636 * before gfs2_journal_recovery() is called because we need to be able to write
637 * to these inodes during recovery.
638 *
639 * Returns: errno
640 */
641 static int init_statfs(struct gfs2_sbd *sdp)
642 {
643 int error = 0;
644 struct inode *master = d_inode(sdp->sd_master_dir);
645 struct inode *pn = NULL;
646 char buf[30];
647 struct gfs2_jdesc *jd;
648 struct gfs2_inode *ip;
649
650 sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs");
651 if (IS_ERR(sdp->sd_statfs_inode)) {
652 error = PTR_ERR(sdp->sd_statfs_inode);
653 fs_err(sdp, "can't read in statfs inode: %d\n", error);
654 goto out;
655 }
656 if (sdp->sd_args.ar_spectator)
657 goto out;
658
659 pn = gfs2_lookup_simple(master, "per_node");
660 if (IS_ERR(pn)) {
661 error = PTR_ERR(pn);
662 fs_err(sdp, "can't find per_node directory: %d\n", error);
663 goto put_statfs;
664 }
665
666 /* For each jid, lookup the corresponding local statfs inode in the
667 * per_node metafs directory and save it in the sdp->sd_sc_inodes_list. */
668 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
669 struct local_statfs_inode *lsi =
670 kmalloc(sizeof(struct local_statfs_inode), GFP_NOFS);
671 if (!lsi) {
672 error = -ENOMEM;
673 goto free_local;
674 }
675 sprintf(buf, "statfs_change%u", jd->jd_jid);
676 lsi->si_sc_inode = gfs2_lookup_simple(pn, buf);
677 if (IS_ERR(lsi->si_sc_inode)) {
678 error = PTR_ERR(lsi->si_sc_inode);
679 fs_err(sdp, "can't find local \"sc\" file#%u: %d\n",
680 jd->jd_jid, error);
681 kfree(lsi);
682 goto free_local;
683 }
684 lsi->si_jid = jd->jd_jid;
685 if (jd->jd_jid == sdp->sd_jdesc->jd_jid)
686 sdp->sd_sc_inode = lsi->si_sc_inode;
687
688 list_add_tail(&lsi->si_list, &sdp->sd_sc_inodes_list);
689 }
690
691 iput(pn);
692 pn = NULL;
693 ip = GFS2_I(sdp->sd_sc_inode);
694 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
695 &sdp->sd_sc_gh);
696 if (error) {
697 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
698 goto free_local;
699 }
700 /* read in the local statfs buffer - other nodes don't change it. */
701 error = gfs2_meta_inode_buffer(ip, &sdp->sd_sc_bh);
702 if (error) {
703 fs_err(sdp, "Cannot read in local statfs: %d\n", error);
704 goto unlock_sd_gh;
705 }
706 return 0;
707
708 unlock_sd_gh:
709 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
710 free_local:
711 free_local_statfs_inodes(sdp);
712 iput(pn);
713 put_statfs:
714 iput(sdp->sd_statfs_inode);
715 out:
716 return error;
717 }
718
719 /* Uninitialize and free up memory used by the list of statfs inodes */
720 static void uninit_statfs(struct gfs2_sbd *sdp)
721 {
722 if (!sdp->sd_args.ar_spectator) {
723 brelse(sdp->sd_sc_bh);
724 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
725 free_local_statfs_inodes(sdp);
726 }
727 iput(sdp->sd_statfs_inode);
728 }
729
730 static int init_journal(struct gfs2_sbd *sdp, int undo)
731 {
732 struct inode *master = d_inode(sdp->sd_master_dir);
733 struct gfs2_holder ji_gh;
734 struct gfs2_inode *ip;
735 int jindex = 1;
736 int error = 0;
737
738 if (undo) {
739 jindex = 0;
740 goto fail_statfs;
741 }
742
743 sdp->sd_jindex = gfs2_lookup_simple(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,
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 | GL_NOCACHE,
794 &sdp->sd_jinode_gh);
795 if (error) {
796 fs_err(sdp, "can't acquire journal inode glock: %d\n",
797 error);
798 goto fail_journal_gh;
799 }
800
801 error = gfs2_jdesc_check(sdp->sd_jdesc);
802 if (error) {
803 fs_err(sdp, "my journal (%u) is bad: %d\n",
804 sdp->sd_jdesc->jd_jid, error);
805 goto fail_jinode_gh;
806 }
807 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
808 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
809 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
810
811 /* Map the extents for this journal's blocks */
812 gfs2_map_journal_extents(sdp, sdp->sd_jdesc);
813 }
814 trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free));
815
816 /* Lookup statfs inodes here so journal recovery can use them. */
817 error = init_statfs(sdp);
818 if (error)
819 goto fail_jinode_gh;
820
821 if (sdp->sd_lockstruct.ls_first) {
822 unsigned int x;
823 for (x = 0; x < sdp->sd_journals; x++) {
824 struct gfs2_jdesc *jd = gfs2_jdesc_find(sdp, x);
825
826 if (sdp->sd_args.ar_spectator) {
827 error = check_journal_clean(sdp, jd, true);
828 if (error)
829 goto fail_statfs;
830 continue;
831 }
832 error = gfs2_recover_journal(jd, true);
833 if (error) {
834 fs_err(sdp, "error recovering journal %u: %d\n",
835 x, error);
836 goto fail_statfs;
837 }
838 }
839
840 gfs2_others_may_mount(sdp);
841 } else if (!sdp->sd_args.ar_spectator) {
842 error = gfs2_recover_journal(sdp->sd_jdesc, true);
843 if (error) {
844 fs_err(sdp, "error recovering my journal: %d\n", error);
845 goto fail_statfs;
846 }
847 }
848
849 sdp->sd_log_idle = 1;
850 set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
851 gfs2_glock_dq_uninit(&ji_gh);
852 jindex = 0;
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 (jindex)
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
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_simple(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_simple(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
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_simple(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_simple(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, 0,
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
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
1075 void gfs2_lm_unmount(struct gfs2_sbd *sdp)
1076 {
1077 const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops;
1078 if (likely(!gfs2_withdrawn(sdp)) && lm->lm_unmount)
1079 lm->lm_unmount(sdp);
1080 }
1081
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
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
1102 static int init_threads(struct gfs2_sbd *sdp)
1103 {
1104 struct task_struct *p;
1105 int error = 0;
1106
1107 p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
1108 if (IS_ERR(p)) {
1109 error = PTR_ERR(p);
1110 fs_err(sdp, "can't start logd thread: %d\n", error);
1111 return error;
1112 }
1113 sdp->sd_logd_process = p;
1114
1115 p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
1116 if (IS_ERR(p)) {
1117 error = PTR_ERR(p);
1118 fs_err(sdp, "can't start quotad thread: %d\n", error);
1119 goto fail;
1120 }
1121 sdp->sd_quotad_process = p;
1122 return 0;
1123
1124 fail:
1125 kthread_stop(sdp->sd_logd_process);
1126 sdp->sd_logd_process = NULL;
1127 return error;
1128 }
1129
1130 /**
1131 * gfs2_fill_super - Read in superblock
1132 * @sb: The VFS superblock
1133 * @fc: Mount options and flags
1134 *
1135 * Returns: -errno
1136 */
1137 static int gfs2_fill_super(struct super_block *sb, struct fs_context *fc)
1138 {
1139 struct gfs2_args *args = fc->fs_private;
1140 int silent = fc->sb_flags & SB_SILENT;
1141 struct gfs2_sbd *sdp;
1142 struct gfs2_holder mount_gh;
1143 struct gfs2_holder freeze_gh;
1144 int error;
1145
1146 sdp = init_sbd(sb);
1147 if (!sdp) {
1148 pr_warn("can't alloc struct gfs2_sbd\n");
1149 return -ENOMEM;
1150 }
1151 sdp->sd_args = *args;
1152
1153 if (sdp->sd_args.ar_spectator) {
1154 sb->s_flags |= SB_RDONLY;
1155 set_bit(SDF_RORECOVERY, &sdp->sd_flags);
1156 }
1157 if (sdp->sd_args.ar_posix_acl)
1158 sb->s_flags |= SB_POSIXACL;
1159 if (sdp->sd_args.ar_nobarrier)
1160 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1161
1162 sb->s_flags |= SB_NOSEC;
1163 sb->s_magic = GFS2_MAGIC;
1164 sb->s_op = &gfs2_super_ops;
1165 sb->s_d_op = &gfs2_dops;
1166 sb->s_export_op = &gfs2_export_ops;
1167 sb->s_qcop = &gfs2_quotactl_ops;
1168 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1169 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
1170 sb->s_time_gran = 1;
1171 sb->s_maxbytes = MAX_LFS_FILESIZE;
1172
1173 /* Set up the buffer cache and fill in some fake block size values
1174 to allow us to read-in the on-disk superblock. */
1175 sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
1176 sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
1177 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
1178 GFS2_BASIC_BLOCK_SHIFT;
1179 sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift);
1180
1181 sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit;
1182 sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum;
1183 if (sdp->sd_args.ar_statfs_quantum) {
1184 sdp->sd_tune.gt_statfs_slow = 0;
1185 sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum;
1186 } else {
1187 sdp->sd_tune.gt_statfs_slow = 1;
1188 sdp->sd_tune.gt_statfs_quantum = 30;
1189 }
1190
1191 error = init_names(sdp, silent);
1192 if (error)
1193 goto fail_free;
1194
1195 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s", sdp->sd_table_name);
1196
1197 error = gfs2_sys_fs_add(sdp);
1198 if (error)
1199 goto fail_free;
1200
1201 gfs2_create_debugfs_file(sdp);
1202
1203 error = gfs2_lm_mount(sdp, silent);
1204 if (error)
1205 goto fail_debug;
1206
1207 error = init_locking(sdp, &mount_gh, DO);
1208 if (error)
1209 goto fail_lm;
1210
1211 error = init_sb(sdp, silent);
1212 if (error)
1213 goto fail_locking;
1214
1215 /* Turn rgrplvb on by default if fs format is recent enough */
1216 if (!sdp->sd_args.ar_got_rgrplvb && sdp->sd_sb.sb_fs_format > 1801)
1217 sdp->sd_args.ar_rgrplvb = 1;
1218
1219 error = wait_on_journal(sdp);
1220 if (error)
1221 goto fail_sb;
1222
1223 /*
1224 * If user space has failed to join the cluster or some similar
1225 * failure has occurred, then the journal id will contain a
1226 * negative (error) number. This will then be returned to the
1227 * caller (of the mount syscall). We do this even for spectator
1228 * mounts (which just write a jid of 0 to indicate "ok" even though
1229 * the jid is unused in the spectator case)
1230 */
1231 if (sdp->sd_lockstruct.ls_jid < 0) {
1232 error = sdp->sd_lockstruct.ls_jid;
1233 sdp->sd_lockstruct.ls_jid = 0;
1234 goto fail_sb;
1235 }
1236
1237 if (sdp->sd_args.ar_spectator)
1238 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.s",
1239 sdp->sd_table_name);
1240 else
1241 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.%u",
1242 sdp->sd_table_name, sdp->sd_lockstruct.ls_jid);
1243
1244 error = init_inodes(sdp, DO);
1245 if (error)
1246 goto fail_sb;
1247
1248 error = init_per_node(sdp, DO);
1249 if (error)
1250 goto fail_inodes;
1251
1252 error = gfs2_statfs_init(sdp);
1253 if (error) {
1254 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
1255 goto fail_per_node;
1256 }
1257
1258 if (!sb_rdonly(sb)) {
1259 error = init_threads(sdp);
1260 if (error) {
1261 gfs2_withdraw_delayed(sdp);
1262 goto fail_per_node;
1263 }
1264 }
1265
1266 error = gfs2_freeze_lock(sdp, &freeze_gh, 0);
1267 if (error)
1268 goto fail_per_node;
1269
1270 if (!sb_rdonly(sb))
1271 error = gfs2_make_fs_rw(sdp);
1272
1273 gfs2_freeze_unlock(&freeze_gh);
1274 if (error) {
1275 if (sdp->sd_quotad_process)
1276 kthread_stop(sdp->sd_quotad_process);
1277 sdp->sd_quotad_process = NULL;
1278 if (sdp->sd_logd_process)
1279 kthread_stop(sdp->sd_logd_process);
1280 sdp->sd_logd_process = NULL;
1281 fs_err(sdp, "can't make FS RW: %d\n", error);
1282 goto fail_per_node;
1283 }
1284 gfs2_glock_dq_uninit(&mount_gh);
1285 gfs2_online_uevent(sdp);
1286 return 0;
1287
1288 fail_per_node:
1289 init_per_node(sdp, UNDO);
1290 fail_inodes:
1291 init_inodes(sdp, UNDO);
1292 fail_sb:
1293 if (sdp->sd_root_dir)
1294 dput(sdp->sd_root_dir);
1295 if (sdp->sd_master_dir)
1296 dput(sdp->sd_master_dir);
1297 if (sb->s_root)
1298 dput(sb->s_root);
1299 sb->s_root = NULL;
1300 fail_locking:
1301 init_locking(sdp, &mount_gh, UNDO);
1302 fail_lm:
1303 complete_all(&sdp->sd_journal_ready);
1304 gfs2_gl_hash_clear(sdp);
1305 gfs2_lm_unmount(sdp);
1306 fail_debug:
1307 gfs2_delete_debugfs_file(sdp);
1308 gfs2_sys_fs_del(sdp);
1309 fail_free:
1310 free_sbd(sdp);
1311 sb->s_fs_info = NULL;
1312 return error;
1313 }
1314
1315 /**
1316 * gfs2_get_tree - Get the GFS2 superblock and root directory
1317 * @fc: The filesystem context
1318 *
1319 * Returns: 0 or -errno on error
1320 */
1321 static int gfs2_get_tree(struct fs_context *fc)
1322 {
1323 struct gfs2_args *args = fc->fs_private;
1324 struct gfs2_sbd *sdp;
1325 int error;
1326
1327 error = get_tree_bdev(fc, gfs2_fill_super);
1328 if (error)
1329 return error;
1330
1331 sdp = fc->root->d_sb->s_fs_info;
1332 dput(fc->root);
1333 if (args->ar_meta)
1334 fc->root = dget(sdp->sd_master_dir);
1335 else
1336 fc->root = dget(sdp->sd_root_dir);
1337 return 0;
1338 }
1339
1340 static void gfs2_fc_free(struct fs_context *fc)
1341 {
1342 struct gfs2_args *args = fc->fs_private;
1343
1344 kfree(args);
1345 }
1346
1347 enum gfs2_param {
1348 Opt_lockproto,
1349 Opt_locktable,
1350 Opt_hostdata,
1351 Opt_spectator,
1352 Opt_ignore_local_fs,
1353 Opt_localflocks,
1354 Opt_localcaching,
1355 Opt_debug,
1356 Opt_upgrade,
1357 Opt_acl,
1358 Opt_quota,
1359 Opt_quota_flag,
1360 Opt_suiddir,
1361 Opt_data,
1362 Opt_meta,
1363 Opt_discard,
1364 Opt_commit,
1365 Opt_errors,
1366 Opt_statfs_quantum,
1367 Opt_statfs_percent,
1368 Opt_quota_quantum,
1369 Opt_barrier,
1370 Opt_rgrplvb,
1371 Opt_loccookie,
1372 };
1373
1374 static const struct constant_table gfs2_param_quota[] = {
1375 {"off", GFS2_QUOTA_OFF},
1376 {"account", GFS2_QUOTA_ACCOUNT},
1377 {"on", GFS2_QUOTA_ON},
1378 {}
1379 };
1380
1381 enum opt_data {
1382 Opt_data_writeback = GFS2_DATA_WRITEBACK,
1383 Opt_data_ordered = GFS2_DATA_ORDERED,
1384 };
1385
1386 static const struct constant_table gfs2_param_data[] = {
1387 {"writeback", Opt_data_writeback },
1388 {"ordered", Opt_data_ordered },
1389 {}
1390 };
1391
1392 enum opt_errors {
1393 Opt_errors_withdraw = GFS2_ERRORS_WITHDRAW,
1394 Opt_errors_panic = GFS2_ERRORS_PANIC,
1395 };
1396
1397 static const struct constant_table gfs2_param_errors[] = {
1398 {"withdraw", Opt_errors_withdraw },
1399 {"panic", Opt_errors_panic },
1400 {}
1401 };
1402
1403 static const struct fs_parameter_spec gfs2_fs_parameters[] = {
1404 fsparam_string ("lockproto", Opt_lockproto),
1405 fsparam_string ("locktable", Opt_locktable),
1406 fsparam_string ("hostdata", Opt_hostdata),
1407 fsparam_flag ("spectator", Opt_spectator),
1408 fsparam_flag ("norecovery", Opt_spectator),
1409 fsparam_flag ("ignore_local_fs", Opt_ignore_local_fs),
1410 fsparam_flag ("localflocks", Opt_localflocks),
1411 fsparam_flag ("localcaching", Opt_localcaching),
1412 fsparam_flag_no("debug", Opt_debug),
1413 fsparam_flag ("upgrade", Opt_upgrade),
1414 fsparam_flag_no("acl", Opt_acl),
1415 fsparam_flag_no("suiddir", Opt_suiddir),
1416 fsparam_enum ("data", Opt_data, gfs2_param_data),
1417 fsparam_flag ("meta", Opt_meta),
1418 fsparam_flag_no("discard", Opt_discard),
1419 fsparam_s32 ("commit", Opt_commit),
1420 fsparam_enum ("errors", Opt_errors, gfs2_param_errors),
1421 fsparam_s32 ("statfs_quantum", Opt_statfs_quantum),
1422 fsparam_s32 ("statfs_percent", Opt_statfs_percent),
1423 fsparam_s32 ("quota_quantum", Opt_quota_quantum),
1424 fsparam_flag_no("barrier", Opt_barrier),
1425 fsparam_flag_no("rgrplvb", Opt_rgrplvb),
1426 fsparam_flag_no("loccookie", Opt_loccookie),
1427 /* quota can be a flag or an enum so it gets special treatment */
1428 fsparam_flag_no("quota", Opt_quota_flag),
1429 fsparam_enum("quota", Opt_quota, gfs2_param_quota),
1430 {}
1431 };
1432
1433 /* Parse a single mount parameter */
1434 static int gfs2_parse_param(struct fs_context *fc, struct fs_parameter *param)
1435 {
1436 struct gfs2_args *args = fc->fs_private;
1437 struct fs_parse_result result;
1438 int o;
1439
1440 o = fs_parse(fc, gfs2_fs_parameters, param, &result);
1441 if (o < 0)
1442 return o;
1443
1444 switch (o) {
1445 case Opt_lockproto:
1446 strlcpy(args->ar_lockproto, param->string, GFS2_LOCKNAME_LEN);
1447 break;
1448 case Opt_locktable:
1449 strlcpy(args->ar_locktable, param->string, GFS2_LOCKNAME_LEN);
1450 break;
1451 case Opt_hostdata:
1452 strlcpy(args->ar_hostdata, param->string, GFS2_LOCKNAME_LEN);
1453 break;
1454 case Opt_spectator:
1455 args->ar_spectator = 1;
1456 break;
1457 case Opt_ignore_local_fs:
1458 /* Retained for backwards compat only */
1459 break;
1460 case Opt_localflocks:
1461 args->ar_localflocks = 1;
1462 break;
1463 case Opt_localcaching:
1464 /* Retained for backwards compat only */
1465 break;
1466 case Opt_debug:
1467 if (result.boolean && args->ar_errors == GFS2_ERRORS_PANIC)
1468 return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive");
1469 args->ar_debug = result.boolean;
1470 break;
1471 case Opt_upgrade:
1472 /* Retained for backwards compat only */
1473 break;
1474 case Opt_acl:
1475 args->ar_posix_acl = result.boolean;
1476 break;
1477 case Opt_quota_flag:
1478 args->ar_quota = result.negated ? GFS2_QUOTA_OFF : GFS2_QUOTA_ON;
1479 break;
1480 case Opt_quota:
1481 args->ar_quota = result.int_32;
1482 break;
1483 case Opt_suiddir:
1484 args->ar_suiddir = result.boolean;
1485 break;
1486 case Opt_data:
1487 /* The uint_32 result maps directly to GFS2_DATA_* */
1488 args->ar_data = result.uint_32;
1489 break;
1490 case Opt_meta:
1491 args->ar_meta = 1;
1492 break;
1493 case Opt_discard:
1494 args->ar_discard = result.boolean;
1495 break;
1496 case Opt_commit:
1497 if (result.int_32 <= 0)
1498 return invalfc(fc, "commit mount option requires a positive numeric argument");
1499 args->ar_commit = result.int_32;
1500 break;
1501 case Opt_statfs_quantum:
1502 if (result.int_32 < 0)
1503 return invalfc(fc, "statfs_quantum mount option requires a non-negative numeric argument");
1504 args->ar_statfs_quantum = result.int_32;
1505 break;
1506 case Opt_quota_quantum:
1507 if (result.int_32 <= 0)
1508 return invalfc(fc, "quota_quantum mount option requires a positive numeric argument");
1509 args->ar_quota_quantum = result.int_32;
1510 break;
1511 case Opt_statfs_percent:
1512 if (result.int_32 < 0 || result.int_32 > 100)
1513 return invalfc(fc, "statfs_percent mount option requires a numeric argument between 0 and 100");
1514 args->ar_statfs_percent = result.int_32;
1515 break;
1516 case Opt_errors:
1517 if (args->ar_debug && result.uint_32 == GFS2_ERRORS_PANIC)
1518 return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive");
1519 args->ar_errors = result.uint_32;
1520 break;
1521 case Opt_barrier:
1522 args->ar_nobarrier = result.boolean;
1523 break;
1524 case Opt_rgrplvb:
1525 args->ar_rgrplvb = result.boolean;
1526 args->ar_got_rgrplvb = 1;
1527 break;
1528 case Opt_loccookie:
1529 args->ar_loccookie = result.boolean;
1530 break;
1531 default:
1532 return invalfc(fc, "invalid mount option: %s", param->key);
1533 }
1534 return 0;
1535 }
1536
1537 static int gfs2_reconfigure(struct fs_context *fc)
1538 {
1539 struct super_block *sb = fc->root->d_sb;
1540 struct gfs2_sbd *sdp = sb->s_fs_info;
1541 struct gfs2_args *oldargs = &sdp->sd_args;
1542 struct gfs2_args *newargs = fc->fs_private;
1543 struct gfs2_tune *gt = &sdp->sd_tune;
1544 int error = 0;
1545
1546 sync_filesystem(sb);
1547
1548 spin_lock(&gt->gt_spin);
1549 oldargs->ar_commit = gt->gt_logd_secs;
1550 oldargs->ar_quota_quantum = gt->gt_quota_quantum;
1551 if (gt->gt_statfs_slow)
1552 oldargs->ar_statfs_quantum = 0;
1553 else
1554 oldargs->ar_statfs_quantum = gt->gt_statfs_quantum;
1555 spin_unlock(&gt->gt_spin);
1556
1557 if (strcmp(newargs->ar_lockproto, oldargs->ar_lockproto)) {
1558 errorfc(fc, "reconfiguration of locking protocol not allowed");
1559 return -EINVAL;
1560 }
1561 if (strcmp(newargs->ar_locktable, oldargs->ar_locktable)) {
1562 errorfc(fc, "reconfiguration of lock table not allowed");
1563 return -EINVAL;
1564 }
1565 if (strcmp(newargs->ar_hostdata, oldargs->ar_hostdata)) {
1566 errorfc(fc, "reconfiguration of host data not allowed");
1567 return -EINVAL;
1568 }
1569 if (newargs->ar_spectator != oldargs->ar_spectator) {
1570 errorfc(fc, "reconfiguration of spectator mode not allowed");
1571 return -EINVAL;
1572 }
1573 if (newargs->ar_localflocks != oldargs->ar_localflocks) {
1574 errorfc(fc, "reconfiguration of localflocks not allowed");
1575 return -EINVAL;
1576 }
1577 if (newargs->ar_meta != oldargs->ar_meta) {
1578 errorfc(fc, "switching between gfs2 and gfs2meta not allowed");
1579 return -EINVAL;
1580 }
1581 if (oldargs->ar_spectator)
1582 fc->sb_flags |= SB_RDONLY;
1583
1584 if ((sb->s_flags ^ fc->sb_flags) & SB_RDONLY) {
1585 struct gfs2_holder freeze_gh;
1586
1587 error = gfs2_freeze_lock(sdp, &freeze_gh, 0);
1588 if (error)
1589 return -EINVAL;
1590
1591 if (fc->sb_flags & SB_RDONLY) {
1592 gfs2_make_fs_ro(sdp);
1593 } else {
1594 error = gfs2_make_fs_rw(sdp);
1595 if (error)
1596 errorfc(fc, "unable to remount read-write");
1597 }
1598 gfs2_freeze_unlock(&freeze_gh);
1599 }
1600 sdp->sd_args = *newargs;
1601
1602 if (sdp->sd_args.ar_posix_acl)
1603 sb->s_flags |= SB_POSIXACL;
1604 else
1605 sb->s_flags &= ~SB_POSIXACL;
1606 if (sdp->sd_args.ar_nobarrier)
1607 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1608 else
1609 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1610 spin_lock(&gt->gt_spin);
1611 gt->gt_logd_secs = newargs->ar_commit;
1612 gt->gt_quota_quantum = newargs->ar_quota_quantum;
1613 if (newargs->ar_statfs_quantum) {
1614 gt->gt_statfs_slow = 0;
1615 gt->gt_statfs_quantum = newargs->ar_statfs_quantum;
1616 }
1617 else {
1618 gt->gt_statfs_slow = 1;
1619 gt->gt_statfs_quantum = 30;
1620 }
1621 spin_unlock(&gt->gt_spin);
1622
1623 gfs2_online_uevent(sdp);
1624 return error;
1625 }
1626
1627 static const struct fs_context_operations gfs2_context_ops = {
1628 .free = gfs2_fc_free,
1629 .parse_param = gfs2_parse_param,
1630 .get_tree = gfs2_get_tree,
1631 .reconfigure = gfs2_reconfigure,
1632 };
1633
1634 /* Set up the filesystem mount context */
1635 static int gfs2_init_fs_context(struct fs_context *fc)
1636 {
1637 struct gfs2_args *args;
1638
1639 args = kmalloc(sizeof(*args), GFP_KERNEL);
1640 if (args == NULL)
1641 return -ENOMEM;
1642
1643 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
1644 struct gfs2_sbd *sdp = fc->root->d_sb->s_fs_info;
1645
1646 *args = sdp->sd_args;
1647 } else {
1648 memset(args, 0, sizeof(*args));
1649 args->ar_quota = GFS2_QUOTA_DEFAULT;
1650 args->ar_data = GFS2_DATA_DEFAULT;
1651 args->ar_commit = 30;
1652 args->ar_statfs_quantum = 30;
1653 args->ar_quota_quantum = 60;
1654 args->ar_errors = GFS2_ERRORS_DEFAULT;
1655 }
1656 fc->fs_private = args;
1657 fc->ops = &gfs2_context_ops;
1658 return 0;
1659 }
1660
1661 static int set_meta_super(struct super_block *s, struct fs_context *fc)
1662 {
1663 return -EINVAL;
1664 }
1665
1666 static int test_meta_super(struct super_block *s, struct fs_context *fc)
1667 {
1668 return (fc->sget_key == s->s_bdev);
1669 }
1670
1671 static int gfs2_meta_get_tree(struct fs_context *fc)
1672 {
1673 struct super_block *s;
1674 struct gfs2_sbd *sdp;
1675 struct path path;
1676 int error;
1677
1678 if (!fc->source || !*fc->source)
1679 return -EINVAL;
1680
1681 error = kern_path(fc->source, LOOKUP_FOLLOW, &path);
1682 if (error) {
1683 pr_warn("path_lookup on %s returned error %d\n",
1684 fc->source, error);
1685 return error;
1686 }
1687 fc->fs_type = &gfs2_fs_type;
1688 fc->sget_key = path.dentry->d_sb->s_bdev;
1689 s = sget_fc(fc, test_meta_super, set_meta_super);
1690 path_put(&path);
1691 if (IS_ERR(s)) {
1692 pr_warn("gfs2 mount does not exist\n");
1693 return PTR_ERR(s);
1694 }
1695 if ((fc->sb_flags ^ s->s_flags) & SB_RDONLY) {
1696 deactivate_locked_super(s);
1697 return -EBUSY;
1698 }
1699 sdp = s->s_fs_info;
1700 fc->root = dget(sdp->sd_master_dir);
1701 return 0;
1702 }
1703
1704 static const struct fs_context_operations gfs2_meta_context_ops = {
1705 .free = gfs2_fc_free,
1706 .get_tree = gfs2_meta_get_tree,
1707 };
1708
1709 static int gfs2_meta_init_fs_context(struct fs_context *fc)
1710 {
1711 int ret = gfs2_init_fs_context(fc);
1712
1713 if (ret)
1714 return ret;
1715
1716 fc->ops = &gfs2_meta_context_ops;
1717 return 0;
1718 }
1719
1720 static void gfs2_kill_sb(struct super_block *sb)
1721 {
1722 struct gfs2_sbd *sdp = sb->s_fs_info;
1723
1724 if (sdp == NULL) {
1725 kill_block_super(sb);
1726 return;
1727 }
1728
1729 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SYNC | GFS2_LFC_KILL_SB);
1730 dput(sdp->sd_root_dir);
1731 dput(sdp->sd_master_dir);
1732 sdp->sd_root_dir = NULL;
1733 sdp->sd_master_dir = NULL;
1734 shrink_dcache_sb(sb);
1735 kill_block_super(sb);
1736 }
1737
1738 struct file_system_type gfs2_fs_type = {
1739 .name = "gfs2",
1740 .fs_flags = FS_REQUIRES_DEV,
1741 .init_fs_context = gfs2_init_fs_context,
1742 .parameters = gfs2_fs_parameters,
1743 .kill_sb = gfs2_kill_sb,
1744 .owner = THIS_MODULE,
1745 };
1746 MODULE_ALIAS_FS("gfs2");
1747
1748 struct file_system_type gfs2meta_fs_type = {
1749 .name = "gfs2meta",
1750 .fs_flags = FS_REQUIRES_DEV,
1751 .init_fs_context = gfs2_meta_init_fs_context,
1752 .owner = THIS_MODULE,
1753 };
1754 MODULE_ALIAS_FS("gfs2meta");
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