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[people/ms/linux.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(sb->s_bdev, 1, REQ_OP_READ | REQ_META, GFP_NOFS);
255 bio->bi_iter.bi_sector = sector * (sb->s_blocksize >> 9);
256 bio_add_page(bio, page, PAGE_SIZE, 0);
257
258 bio->bi_end_io = end_bio_io_page;
259 bio->bi_private = page;
260 submit_bio(bio);
261 wait_on_page_locked(page);
262 bio_put(bio);
263 if (!PageUptodate(page)) {
264 __free_page(page);
265 return -EIO;
266 }
267 p = kmap(page);
268 gfs2_sb_in(sdp, p);
269 kunmap(page);
270 __free_page(page);
271 return gfs2_check_sb(sdp, silent);
272 }
273
274 /**
275 * gfs2_read_sb - Read super block
276 * @sdp: The GFS2 superblock
277 * @silent: Don't print message if mount fails
278 *
279 */
280
281 static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent)
282 {
283 u32 hash_blocks, ind_blocks, leaf_blocks;
284 u32 tmp_blocks;
285 unsigned int x;
286 int error;
287
288 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
289 if (error) {
290 if (!silent)
291 fs_err(sdp, "can't read superblock\n");
292 return error;
293 }
294
295 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
296 GFS2_BASIC_BLOCK_SHIFT;
297 sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift);
298 sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
299 sizeof(struct gfs2_dinode)) / sizeof(u64);
300 sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
301 sizeof(struct gfs2_meta_header)) / sizeof(u64);
302 sdp->sd_ldptrs = (sdp->sd_sb.sb_bsize -
303 sizeof(struct gfs2_log_descriptor)) / sizeof(u64);
304 sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
305 sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
306 sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
307 sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64);
308 sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
309 sizeof(struct gfs2_meta_header)) /
310 sizeof(struct gfs2_quota_change);
311 sdp->sd_blocks_per_bitmap = (sdp->sd_sb.sb_bsize -
312 sizeof(struct gfs2_meta_header))
313 * GFS2_NBBY; /* not the rgrp bitmap, subsequent bitmaps only */
314
315 /*
316 * We always keep at least one block reserved for revokes in
317 * transactions. This greatly simplifies allocating additional
318 * revoke blocks.
319 */
320 atomic_set(&sdp->sd_log_revokes_available, sdp->sd_ldptrs);
321
322 /* Compute maximum reservation required to add a entry to a directory */
323
324 hash_blocks = DIV_ROUND_UP(sizeof(u64) * BIT(GFS2_DIR_MAX_DEPTH),
325 sdp->sd_jbsize);
326
327 ind_blocks = 0;
328 for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
329 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
330 ind_blocks += tmp_blocks;
331 }
332
333 leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
334
335 sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
336
337 sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
338 sizeof(struct gfs2_dinode);
339 sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
340 for (x = 2;; x++) {
341 u64 space, d;
342 u32 m;
343
344 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
345 d = space;
346 m = do_div(d, sdp->sd_inptrs);
347
348 if (d != sdp->sd_heightsize[x - 1] || m)
349 break;
350 sdp->sd_heightsize[x] = space;
351 }
352 sdp->sd_max_height = x;
353 sdp->sd_heightsize[x] = ~0;
354 gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
355
356 sdp->sd_max_dents_per_leaf = (sdp->sd_sb.sb_bsize -
357 sizeof(struct gfs2_leaf)) /
358 GFS2_MIN_DIRENT_SIZE;
359 return 0;
360 }
361
362 static int init_names(struct gfs2_sbd *sdp, int silent)
363 {
364 char *proto, *table;
365 int error = 0;
366
367 proto = sdp->sd_args.ar_lockproto;
368 table = sdp->sd_args.ar_locktable;
369
370 /* Try to autodetect */
371
372 if (!proto[0] || !table[0]) {
373 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
374 if (error)
375 return error;
376
377 if (!proto[0])
378 proto = sdp->sd_sb.sb_lockproto;
379 if (!table[0])
380 table = sdp->sd_sb.sb_locktable;
381 }
382
383 if (!table[0])
384 table = sdp->sd_vfs->s_id;
385
386 strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN);
387 strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN);
388
389 table = sdp->sd_table_name;
390 while ((table = strchr(table, '/')))
391 *table = '_';
392
393 return error;
394 }
395
396 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
397 int undo)
398 {
399 int error = 0;
400
401 if (undo)
402 goto fail_trans;
403
404 error = gfs2_glock_nq_num(sdp,
405 GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
406 LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
407 mount_gh);
408 if (error) {
409 fs_err(sdp, "can't acquire mount glock: %d\n", error);
410 goto fail;
411 }
412
413 error = gfs2_glock_nq_num(sdp,
414 GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
415 LM_ST_SHARED,
416 LM_FLAG_NOEXP | GL_EXACT,
417 &sdp->sd_live_gh);
418 if (error) {
419 fs_err(sdp, "can't acquire live glock: %d\n", error);
420 goto fail_mount;
421 }
422
423 error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
424 CREATE, &sdp->sd_rename_gl);
425 if (error) {
426 fs_err(sdp, "can't create rename glock: %d\n", error);
427 goto fail_live;
428 }
429
430 error = gfs2_glock_get(sdp, GFS2_FREEZE_LOCK, &gfs2_freeze_glops,
431 CREATE, &sdp->sd_freeze_gl);
432 if (error) {
433 fs_err(sdp, "can't create transaction glock: %d\n", error);
434 goto fail_rename;
435 }
436
437 return 0;
438
439 fail_trans:
440 gfs2_glock_put(sdp->sd_freeze_gl);
441 fail_rename:
442 gfs2_glock_put(sdp->sd_rename_gl);
443 fail_live:
444 gfs2_glock_dq_uninit(&sdp->sd_live_gh);
445 fail_mount:
446 gfs2_glock_dq_uninit(mount_gh);
447 fail:
448 return error;
449 }
450
451 static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr,
452 u64 no_addr, const char *name)
453 {
454 struct gfs2_sbd *sdp = sb->s_fs_info;
455 struct dentry *dentry;
456 struct inode *inode;
457
458 inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0,
459 GFS2_BLKST_FREE /* ignore */);
460 if (IS_ERR(inode)) {
461 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode));
462 return PTR_ERR(inode);
463 }
464 dentry = d_make_root(inode);
465 if (!dentry) {
466 fs_err(sdp, "can't alloc %s dentry\n", name);
467 return -ENOMEM;
468 }
469 *dptr = dentry;
470 return 0;
471 }
472
473 static int init_sb(struct gfs2_sbd *sdp, int silent)
474 {
475 struct super_block *sb = sdp->sd_vfs;
476 struct gfs2_holder sb_gh;
477 u64 no_addr;
478 int ret;
479
480 ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
481 LM_ST_SHARED, 0, &sb_gh);
482 if (ret) {
483 fs_err(sdp, "can't acquire superblock glock: %d\n", ret);
484 return ret;
485 }
486
487 ret = gfs2_read_sb(sdp, silent);
488 if (ret) {
489 fs_err(sdp, "can't read superblock: %d\n", ret);
490 goto out;
491 }
492
493 switch(sdp->sd_sb.sb_fs_format) {
494 case GFS2_FS_FORMAT_MAX:
495 sb->s_xattr = gfs2_xattr_handlers_max;
496 break;
497
498 case GFS2_FS_FORMAT_MIN:
499 sb->s_xattr = gfs2_xattr_handlers_min;
500 break;
501
502 default:
503 BUG();
504 }
505
506 /* Set up the buffer cache and SB for real */
507 if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) {
508 ret = -EINVAL;
509 fs_err(sdp, "FS block size (%u) is too small for device "
510 "block size (%u)\n",
511 sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev));
512 goto out;
513 }
514 if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
515 ret = -EINVAL;
516 fs_err(sdp, "FS block size (%u) is too big for machine "
517 "page size (%u)\n",
518 sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
519 goto out;
520 }
521 sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
522
523 /* Get the root inode */
524 no_addr = sdp->sd_sb.sb_root_dir.no_addr;
525 ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root");
526 if (ret)
527 goto out;
528
529 /* Get the master inode */
530 no_addr = sdp->sd_sb.sb_master_dir.no_addr;
531 ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master");
532 if (ret) {
533 dput(sdp->sd_root_dir);
534 goto out;
535 }
536 sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir);
537 out:
538 gfs2_glock_dq_uninit(&sb_gh);
539 return ret;
540 }
541
542 static void gfs2_others_may_mount(struct gfs2_sbd *sdp)
543 {
544 char *message = "FIRSTMOUNT=Done";
545 char *envp[] = { message, NULL };
546
547 fs_info(sdp, "first mount done, others may mount\n");
548
549 if (sdp->sd_lockstruct.ls_ops->lm_first_done)
550 sdp->sd_lockstruct.ls_ops->lm_first_done(sdp);
551
552 kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp);
553 }
554
555 /**
556 * gfs2_jindex_hold - Grab a lock on the jindex
557 * @sdp: The GFS2 superblock
558 * @ji_gh: the holder for the jindex glock
559 *
560 * Returns: errno
561 */
562
563 static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
564 {
565 struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex);
566 struct qstr name;
567 char buf[20];
568 struct gfs2_jdesc *jd;
569 int error;
570
571 name.name = buf;
572
573 mutex_lock(&sdp->sd_jindex_mutex);
574
575 for (;;) {
576 struct gfs2_inode *jip;
577
578 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh);
579 if (error)
580 break;
581
582 name.len = sprintf(buf, "journal%u", sdp->sd_journals);
583 name.hash = gfs2_disk_hash(name.name, name.len);
584
585 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL);
586 if (error == -ENOENT) {
587 error = 0;
588 break;
589 }
590
591 gfs2_glock_dq_uninit(ji_gh);
592
593 if (error)
594 break;
595
596 error = -ENOMEM;
597 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
598 if (!jd)
599 break;
600
601 INIT_LIST_HEAD(&jd->extent_list);
602 INIT_LIST_HEAD(&jd->jd_revoke_list);
603
604 INIT_WORK(&jd->jd_work, gfs2_recover_func);
605 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1);
606 if (IS_ERR_OR_NULL(jd->jd_inode)) {
607 if (!jd->jd_inode)
608 error = -ENOENT;
609 else
610 error = PTR_ERR(jd->jd_inode);
611 kfree(jd);
612 break;
613 }
614
615 d_mark_dontcache(jd->jd_inode);
616 spin_lock(&sdp->sd_jindex_spin);
617 jd->jd_jid = sdp->sd_journals++;
618 jip = GFS2_I(jd->jd_inode);
619 jd->jd_no_addr = jip->i_no_addr;
620 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
621 spin_unlock(&sdp->sd_jindex_spin);
622 }
623
624 mutex_unlock(&sdp->sd_jindex_mutex);
625
626 return error;
627 }
628
629 /**
630 * init_statfs - look up and initialize master and local (per node) statfs inodes
631 * @sdp: The GFS2 superblock
632 *
633 * This should be called after the jindex is initialized in init_journal() and
634 * before gfs2_journal_recovery() is called because we need to be able to write
635 * to these inodes during recovery.
636 *
637 * Returns: errno
638 */
639 static int init_statfs(struct gfs2_sbd *sdp)
640 {
641 int error = 0;
642 struct inode *master = d_inode(sdp->sd_master_dir);
643 struct inode *pn = NULL;
644 char buf[30];
645 struct gfs2_jdesc *jd;
646 struct gfs2_inode *ip;
647
648 sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs");
649 if (IS_ERR(sdp->sd_statfs_inode)) {
650 error = PTR_ERR(sdp->sd_statfs_inode);
651 fs_err(sdp, "can't read in statfs inode: %d\n", error);
652 goto out;
653 }
654 if (sdp->sd_args.ar_spectator)
655 goto out;
656
657 pn = gfs2_lookup_simple(master, "per_node");
658 if (IS_ERR(pn)) {
659 error = PTR_ERR(pn);
660 fs_err(sdp, "can't find per_node directory: %d\n", error);
661 goto put_statfs;
662 }
663
664 /* For each jid, lookup the corresponding local statfs inode in the
665 * per_node metafs directory and save it in the sdp->sd_sc_inodes_list. */
666 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
667 struct local_statfs_inode *lsi =
668 kmalloc(sizeof(struct local_statfs_inode), GFP_NOFS);
669 if (!lsi) {
670 error = -ENOMEM;
671 goto free_local;
672 }
673 sprintf(buf, "statfs_change%u", jd->jd_jid);
674 lsi->si_sc_inode = gfs2_lookup_simple(pn, buf);
675 if (IS_ERR(lsi->si_sc_inode)) {
676 error = PTR_ERR(lsi->si_sc_inode);
677 fs_err(sdp, "can't find local \"sc\" file#%u: %d\n",
678 jd->jd_jid, error);
679 kfree(lsi);
680 goto free_local;
681 }
682 lsi->si_jid = jd->jd_jid;
683 if (jd->jd_jid == sdp->sd_jdesc->jd_jid)
684 sdp->sd_sc_inode = lsi->si_sc_inode;
685
686 list_add_tail(&lsi->si_list, &sdp->sd_sc_inodes_list);
687 }
688
689 iput(pn);
690 pn = NULL;
691 ip = GFS2_I(sdp->sd_sc_inode);
692 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
693 &sdp->sd_sc_gh);
694 if (error) {
695 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
696 goto free_local;
697 }
698 /* read in the local statfs buffer - other nodes don't change it. */
699 error = gfs2_meta_inode_buffer(ip, &sdp->sd_sc_bh);
700 if (error) {
701 fs_err(sdp, "Cannot read in local statfs: %d\n", error);
702 goto unlock_sd_gh;
703 }
704 return 0;
705
706 unlock_sd_gh:
707 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
708 free_local:
709 free_local_statfs_inodes(sdp);
710 iput(pn);
711 put_statfs:
712 iput(sdp->sd_statfs_inode);
713 out:
714 return error;
715 }
716
717 /* Uninitialize and free up memory used by the list of statfs inodes */
718 static void uninit_statfs(struct gfs2_sbd *sdp)
719 {
720 if (!sdp->sd_args.ar_spectator) {
721 brelse(sdp->sd_sc_bh);
722 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
723 free_local_statfs_inodes(sdp);
724 }
725 iput(sdp->sd_statfs_inode);
726 }
727
728 static int init_journal(struct gfs2_sbd *sdp, int undo)
729 {
730 struct inode *master = d_inode(sdp->sd_master_dir);
731 struct gfs2_holder ji_gh;
732 struct gfs2_inode *ip;
733 int jindex = 1;
734 int error = 0;
735
736 if (undo) {
737 jindex = 0;
738 goto fail_statfs;
739 }
740
741 sdp->sd_jindex = gfs2_lookup_simple(master, "jindex");
742 if (IS_ERR(sdp->sd_jindex)) {
743 fs_err(sdp, "can't lookup journal index: %d\n", error);
744 return PTR_ERR(sdp->sd_jindex);
745 }
746
747 /* Load in the journal index special file */
748
749 error = gfs2_jindex_hold(sdp, &ji_gh);
750 if (error) {
751 fs_err(sdp, "can't read journal index: %d\n", error);
752 goto fail;
753 }
754
755 error = -EUSERS;
756 if (!gfs2_jindex_size(sdp)) {
757 fs_err(sdp, "no journals!\n");
758 goto fail_jindex;
759 }
760
761 atomic_set(&sdp->sd_log_blks_needed, 0);
762 if (sdp->sd_args.ar_spectator) {
763 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
764 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
765 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
766 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
767 } else {
768 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
769 fs_err(sdp, "can't mount journal #%u\n",
770 sdp->sd_lockstruct.ls_jid);
771 fs_err(sdp, "there are only %u journals (0 - %u)\n",
772 gfs2_jindex_size(sdp),
773 gfs2_jindex_size(sdp) - 1);
774 goto fail_jindex;
775 }
776 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
777
778 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
779 &gfs2_journal_glops,
780 LM_ST_EXCLUSIVE,
781 LM_FLAG_NOEXP | GL_NOCACHE,
782 &sdp->sd_journal_gh);
783 if (error) {
784 fs_err(sdp, "can't acquire journal glock: %d\n", error);
785 goto fail_jindex;
786 }
787
788 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
789 sdp->sd_jinode_gl = ip->i_gl;
790 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
791 LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE,
792 &sdp->sd_jinode_gh);
793 if (error) {
794 fs_err(sdp, "can't acquire journal inode glock: %d\n",
795 error);
796 goto fail_journal_gh;
797 }
798
799 error = gfs2_jdesc_check(sdp->sd_jdesc);
800 if (error) {
801 fs_err(sdp, "my journal (%u) is bad: %d\n",
802 sdp->sd_jdesc->jd_jid, error);
803 goto fail_jinode_gh;
804 }
805 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
806 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
807 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
808
809 /* Map the extents for this journal's blocks */
810 gfs2_map_journal_extents(sdp, sdp->sd_jdesc);
811 }
812 trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free));
813
814 /* Lookup statfs inodes here so journal recovery can use them. */
815 error = init_statfs(sdp);
816 if (error)
817 goto fail_jinode_gh;
818
819 if (sdp->sd_lockstruct.ls_first) {
820 unsigned int x;
821 for (x = 0; x < sdp->sd_journals; x++) {
822 struct gfs2_jdesc *jd = gfs2_jdesc_find(sdp, x);
823
824 if (sdp->sd_args.ar_spectator) {
825 error = check_journal_clean(sdp, jd, true);
826 if (error)
827 goto fail_statfs;
828 continue;
829 }
830 error = gfs2_recover_journal(jd, true);
831 if (error) {
832 fs_err(sdp, "error recovering journal %u: %d\n",
833 x, error);
834 goto fail_statfs;
835 }
836 }
837
838 gfs2_others_may_mount(sdp);
839 } else if (!sdp->sd_args.ar_spectator) {
840 error = gfs2_recover_journal(sdp->sd_jdesc, true);
841 if (error) {
842 fs_err(sdp, "error recovering my journal: %d\n", error);
843 goto fail_statfs;
844 }
845 }
846
847 sdp->sd_log_idle = 1;
848 set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
849 gfs2_glock_dq_uninit(&ji_gh);
850 jindex = 0;
851 INIT_WORK(&sdp->sd_freeze_work, gfs2_freeze_func);
852 return 0;
853
854 fail_statfs:
855 uninit_statfs(sdp);
856 fail_jinode_gh:
857 /* A withdraw may have done dq/uninit so now we need to check it */
858 if (!sdp->sd_args.ar_spectator &&
859 gfs2_holder_initialized(&sdp->sd_jinode_gh))
860 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
861 fail_journal_gh:
862 if (!sdp->sd_args.ar_spectator &&
863 gfs2_holder_initialized(&sdp->sd_journal_gh))
864 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
865 fail_jindex:
866 gfs2_jindex_free(sdp);
867 if (jindex)
868 gfs2_glock_dq_uninit(&ji_gh);
869 fail:
870 iput(sdp->sd_jindex);
871 return error;
872 }
873
874 static struct lock_class_key gfs2_quota_imutex_key;
875
876 static int init_inodes(struct gfs2_sbd *sdp, int undo)
877 {
878 int error = 0;
879 struct inode *master = d_inode(sdp->sd_master_dir);
880
881 if (undo)
882 goto fail_qinode;
883
884 error = init_journal(sdp, undo);
885 complete_all(&sdp->sd_journal_ready);
886 if (error)
887 goto fail;
888
889 /* Read in the resource index inode */
890 sdp->sd_rindex = gfs2_lookup_simple(master, "rindex");
891 if (IS_ERR(sdp->sd_rindex)) {
892 error = PTR_ERR(sdp->sd_rindex);
893 fs_err(sdp, "can't get resource index inode: %d\n", error);
894 goto fail_journal;
895 }
896 sdp->sd_rindex_uptodate = 0;
897
898 /* Read in the quota inode */
899 sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota");
900 if (IS_ERR(sdp->sd_quota_inode)) {
901 error = PTR_ERR(sdp->sd_quota_inode);
902 fs_err(sdp, "can't get quota file inode: %d\n", error);
903 goto fail_rindex;
904 }
905 /*
906 * i_rwsem on quota files is special. Since this inode is hidden system
907 * file, we are safe to define locking ourselves.
908 */
909 lockdep_set_class(&sdp->sd_quota_inode->i_rwsem,
910 &gfs2_quota_imutex_key);
911
912 error = gfs2_rindex_update(sdp);
913 if (error)
914 goto fail_qinode;
915
916 return 0;
917
918 fail_qinode:
919 iput(sdp->sd_quota_inode);
920 fail_rindex:
921 gfs2_clear_rgrpd(sdp);
922 iput(sdp->sd_rindex);
923 fail_journal:
924 init_journal(sdp, UNDO);
925 fail:
926 return error;
927 }
928
929 static int init_per_node(struct gfs2_sbd *sdp, int undo)
930 {
931 struct inode *pn = NULL;
932 char buf[30];
933 int error = 0;
934 struct gfs2_inode *ip;
935 struct inode *master = d_inode(sdp->sd_master_dir);
936
937 if (sdp->sd_args.ar_spectator)
938 return 0;
939
940 if (undo)
941 goto fail_qc_gh;
942
943 pn = gfs2_lookup_simple(master, "per_node");
944 if (IS_ERR(pn)) {
945 error = PTR_ERR(pn);
946 fs_err(sdp, "can't find per_node directory: %d\n", error);
947 return error;
948 }
949
950 sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
951 sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
952 if (IS_ERR(sdp->sd_qc_inode)) {
953 error = PTR_ERR(sdp->sd_qc_inode);
954 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
955 goto fail_ut_i;
956 }
957
958 iput(pn);
959 pn = NULL;
960
961 ip = GFS2_I(sdp->sd_qc_inode);
962 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
963 &sdp->sd_qc_gh);
964 if (error) {
965 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
966 goto fail_qc_i;
967 }
968
969 return 0;
970
971 fail_qc_gh:
972 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
973 fail_qc_i:
974 iput(sdp->sd_qc_inode);
975 fail_ut_i:
976 iput(pn);
977 return error;
978 }
979
980 static const match_table_t nolock_tokens = {
981 { Opt_jid, "jid=%d", },
982 { Opt_err, NULL },
983 };
984
985 static const struct lm_lockops nolock_ops = {
986 .lm_proto_name = "lock_nolock",
987 .lm_put_lock = gfs2_glock_free,
988 .lm_tokens = &nolock_tokens,
989 };
990
991 /**
992 * gfs2_lm_mount - mount a locking protocol
993 * @sdp: the filesystem
994 * @silent: if 1, don't complain if the FS isn't a GFS2 fs
995 *
996 * Returns: errno
997 */
998
999 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
1000 {
1001 const struct lm_lockops *lm;
1002 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
1003 struct gfs2_args *args = &sdp->sd_args;
1004 const char *proto = sdp->sd_proto_name;
1005 const char *table = sdp->sd_table_name;
1006 char *o, *options;
1007 int ret;
1008
1009 if (!strcmp("lock_nolock", proto)) {
1010 lm = &nolock_ops;
1011 sdp->sd_args.ar_localflocks = 1;
1012 #ifdef CONFIG_GFS2_FS_LOCKING_DLM
1013 } else if (!strcmp("lock_dlm", proto)) {
1014 lm = &gfs2_dlm_ops;
1015 #endif
1016 } else {
1017 pr_info("can't find protocol %s\n", proto);
1018 return -ENOENT;
1019 }
1020
1021 fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);
1022
1023 ls->ls_ops = lm;
1024 ls->ls_first = 1;
1025
1026 for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) {
1027 substring_t tmp[MAX_OPT_ARGS];
1028 int token, option;
1029
1030 if (!o || !*o)
1031 continue;
1032
1033 token = match_token(o, *lm->lm_tokens, tmp);
1034 switch (token) {
1035 case Opt_jid:
1036 ret = match_int(&tmp[0], &option);
1037 if (ret || option < 0)
1038 goto hostdata_error;
1039 if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags))
1040 ls->ls_jid = option;
1041 break;
1042 case Opt_id:
1043 case Opt_nodir:
1044 /* Obsolete, but left for backward compat purposes */
1045 break;
1046 case Opt_first:
1047 ret = match_int(&tmp[0], &option);
1048 if (ret || (option != 0 && option != 1))
1049 goto hostdata_error;
1050 ls->ls_first = option;
1051 break;
1052 case Opt_err:
1053 default:
1054 hostdata_error:
1055 fs_info(sdp, "unknown hostdata (%s)\n", o);
1056 return -EINVAL;
1057 }
1058 }
1059
1060 if (lm->lm_mount == NULL) {
1061 fs_info(sdp, "Now mounting FS (format %u)...\n", sdp->sd_sb.sb_fs_format);
1062 complete_all(&sdp->sd_locking_init);
1063 return 0;
1064 }
1065 ret = lm->lm_mount(sdp, table);
1066 if (ret == 0)
1067 fs_info(sdp, "Joined cluster. Now mounting FS (format %u)...\n",
1068 sdp->sd_sb.sb_fs_format);
1069 complete_all(&sdp->sd_locking_init);
1070 return ret;
1071 }
1072
1073 void gfs2_lm_unmount(struct gfs2_sbd *sdp)
1074 {
1075 const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops;
1076 if (likely(!gfs2_withdrawn(sdp)) && lm->lm_unmount)
1077 lm->lm_unmount(sdp);
1078 }
1079
1080 static int wait_on_journal(struct gfs2_sbd *sdp)
1081 {
1082 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
1083 return 0;
1084
1085 return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, TASK_INTERRUPTIBLE)
1086 ? -EINTR : 0;
1087 }
1088
1089 void gfs2_online_uevent(struct gfs2_sbd *sdp)
1090 {
1091 struct super_block *sb = sdp->sd_vfs;
1092 char ro[20];
1093 char spectator[20];
1094 char *envp[] = { ro, spectator, NULL };
1095 sprintf(ro, "RDONLY=%d", sb_rdonly(sb));
1096 sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
1097 kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp);
1098 }
1099
1100 static int init_threads(struct gfs2_sbd *sdp)
1101 {
1102 struct task_struct *p;
1103 int error = 0;
1104
1105 p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
1106 if (IS_ERR(p)) {
1107 error = PTR_ERR(p);
1108 fs_err(sdp, "can't start logd thread: %d\n", error);
1109 return error;
1110 }
1111 sdp->sd_logd_process = p;
1112
1113 p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
1114 if (IS_ERR(p)) {
1115 error = PTR_ERR(p);
1116 fs_err(sdp, "can't start quotad thread: %d\n", error);
1117 goto fail;
1118 }
1119 sdp->sd_quotad_process = p;
1120 return 0;
1121
1122 fail:
1123 kthread_stop(sdp->sd_logd_process);
1124 sdp->sd_logd_process = NULL;
1125 return error;
1126 }
1127
1128 /**
1129 * gfs2_fill_super - Read in superblock
1130 * @sb: The VFS superblock
1131 * @fc: Mount options and flags
1132 *
1133 * Returns: -errno
1134 */
1135 static int gfs2_fill_super(struct super_block *sb, struct fs_context *fc)
1136 {
1137 struct gfs2_args *args = fc->fs_private;
1138 int silent = fc->sb_flags & SB_SILENT;
1139 struct gfs2_sbd *sdp;
1140 struct gfs2_holder mount_gh;
1141 struct gfs2_holder freeze_gh;
1142 int error;
1143
1144 sdp = init_sbd(sb);
1145 if (!sdp) {
1146 pr_warn("can't alloc struct gfs2_sbd\n");
1147 return -ENOMEM;
1148 }
1149 sdp->sd_args = *args;
1150
1151 if (sdp->sd_args.ar_spectator) {
1152 sb->s_flags |= SB_RDONLY;
1153 set_bit(SDF_RORECOVERY, &sdp->sd_flags);
1154 }
1155 if (sdp->sd_args.ar_posix_acl)
1156 sb->s_flags |= SB_POSIXACL;
1157 if (sdp->sd_args.ar_nobarrier)
1158 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1159
1160 sb->s_flags |= SB_NOSEC;
1161 sb->s_magic = GFS2_MAGIC;
1162 sb->s_op = &gfs2_super_ops;
1163 sb->s_d_op = &gfs2_dops;
1164 sb->s_export_op = &gfs2_export_ops;
1165 sb->s_qcop = &gfs2_quotactl_ops;
1166 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1167 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
1168 sb->s_time_gran = 1;
1169 sb->s_maxbytes = MAX_LFS_FILESIZE;
1170
1171 /* Set up the buffer cache and fill in some fake block size values
1172 to allow us to read-in the on-disk superblock. */
1173 sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
1174 sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
1175 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
1176 GFS2_BASIC_BLOCK_SHIFT;
1177 sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift);
1178
1179 sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit;
1180 sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum;
1181 if (sdp->sd_args.ar_statfs_quantum) {
1182 sdp->sd_tune.gt_statfs_slow = 0;
1183 sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum;
1184 } else {
1185 sdp->sd_tune.gt_statfs_slow = 1;
1186 sdp->sd_tune.gt_statfs_quantum = 30;
1187 }
1188
1189 error = init_names(sdp, silent);
1190 if (error)
1191 goto fail_free;
1192
1193 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s", sdp->sd_table_name);
1194
1195 error = gfs2_sys_fs_add(sdp);
1196 if (error)
1197 goto fail_free;
1198
1199 gfs2_create_debugfs_file(sdp);
1200
1201 error = gfs2_lm_mount(sdp, silent);
1202 if (error)
1203 goto fail_debug;
1204
1205 error = init_locking(sdp, &mount_gh, DO);
1206 if (error)
1207 goto fail_lm;
1208
1209 error = init_sb(sdp, silent);
1210 if (error)
1211 goto fail_locking;
1212
1213 /* Turn rgrplvb on by default if fs format is recent enough */
1214 if (!sdp->sd_args.ar_got_rgrplvb && sdp->sd_sb.sb_fs_format > 1801)
1215 sdp->sd_args.ar_rgrplvb = 1;
1216
1217 error = wait_on_journal(sdp);
1218 if (error)
1219 goto fail_sb;
1220
1221 /*
1222 * If user space has failed to join the cluster or some similar
1223 * failure has occurred, then the journal id will contain a
1224 * negative (error) number. This will then be returned to the
1225 * caller (of the mount syscall). We do this even for spectator
1226 * mounts (which just write a jid of 0 to indicate "ok" even though
1227 * the jid is unused in the spectator case)
1228 */
1229 if (sdp->sd_lockstruct.ls_jid < 0) {
1230 error = sdp->sd_lockstruct.ls_jid;
1231 sdp->sd_lockstruct.ls_jid = 0;
1232 goto fail_sb;
1233 }
1234
1235 if (sdp->sd_args.ar_spectator)
1236 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.s",
1237 sdp->sd_table_name);
1238 else
1239 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.%u",
1240 sdp->sd_table_name, sdp->sd_lockstruct.ls_jid);
1241
1242 error = init_inodes(sdp, DO);
1243 if (error)
1244 goto fail_sb;
1245
1246 error = init_per_node(sdp, DO);
1247 if (error)
1248 goto fail_inodes;
1249
1250 error = gfs2_statfs_init(sdp);
1251 if (error) {
1252 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
1253 goto fail_per_node;
1254 }
1255
1256 if (!sb_rdonly(sb)) {
1257 error = init_threads(sdp);
1258 if (error) {
1259 gfs2_withdraw_delayed(sdp);
1260 goto fail_per_node;
1261 }
1262 }
1263
1264 error = gfs2_freeze_lock(sdp, &freeze_gh, 0);
1265 if (error)
1266 goto fail_per_node;
1267
1268 if (!sb_rdonly(sb))
1269 error = gfs2_make_fs_rw(sdp);
1270
1271 gfs2_freeze_unlock(&freeze_gh);
1272 if (error) {
1273 if (sdp->sd_quotad_process)
1274 kthread_stop(sdp->sd_quotad_process);
1275 sdp->sd_quotad_process = NULL;
1276 if (sdp->sd_logd_process)
1277 kthread_stop(sdp->sd_logd_process);
1278 sdp->sd_logd_process = NULL;
1279 fs_err(sdp, "can't make FS RW: %d\n", error);
1280 goto fail_per_node;
1281 }
1282 gfs2_glock_dq_uninit(&mount_gh);
1283 gfs2_online_uevent(sdp);
1284 return 0;
1285
1286 fail_per_node:
1287 init_per_node(sdp, UNDO);
1288 fail_inodes:
1289 init_inodes(sdp, UNDO);
1290 fail_sb:
1291 if (sdp->sd_root_dir)
1292 dput(sdp->sd_root_dir);
1293 if (sdp->sd_master_dir)
1294 dput(sdp->sd_master_dir);
1295 if (sb->s_root)
1296 dput(sb->s_root);
1297 sb->s_root = NULL;
1298 fail_locking:
1299 init_locking(sdp, &mount_gh, UNDO);
1300 fail_lm:
1301 complete_all(&sdp->sd_journal_ready);
1302 gfs2_gl_hash_clear(sdp);
1303 gfs2_lm_unmount(sdp);
1304 fail_debug:
1305 gfs2_delete_debugfs_file(sdp);
1306 gfs2_sys_fs_del(sdp);
1307 fail_free:
1308 free_sbd(sdp);
1309 sb->s_fs_info = NULL;
1310 return error;
1311 }
1312
1313 /**
1314 * gfs2_get_tree - Get the GFS2 superblock and root directory
1315 * @fc: The filesystem context
1316 *
1317 * Returns: 0 or -errno on error
1318 */
1319 static int gfs2_get_tree(struct fs_context *fc)
1320 {
1321 struct gfs2_args *args = fc->fs_private;
1322 struct gfs2_sbd *sdp;
1323 int error;
1324
1325 error = get_tree_bdev(fc, gfs2_fill_super);
1326 if (error)
1327 return error;
1328
1329 sdp = fc->root->d_sb->s_fs_info;
1330 dput(fc->root);
1331 if (args->ar_meta)
1332 fc->root = dget(sdp->sd_master_dir);
1333 else
1334 fc->root = dget(sdp->sd_root_dir);
1335 return 0;
1336 }
1337
1338 static void gfs2_fc_free(struct fs_context *fc)
1339 {
1340 struct gfs2_args *args = fc->fs_private;
1341
1342 kfree(args);
1343 }
1344
1345 enum gfs2_param {
1346 Opt_lockproto,
1347 Opt_locktable,
1348 Opt_hostdata,
1349 Opt_spectator,
1350 Opt_ignore_local_fs,
1351 Opt_localflocks,
1352 Opt_localcaching,
1353 Opt_debug,
1354 Opt_upgrade,
1355 Opt_acl,
1356 Opt_quota,
1357 Opt_quota_flag,
1358 Opt_suiddir,
1359 Opt_data,
1360 Opt_meta,
1361 Opt_discard,
1362 Opt_commit,
1363 Opt_errors,
1364 Opt_statfs_quantum,
1365 Opt_statfs_percent,
1366 Opt_quota_quantum,
1367 Opt_barrier,
1368 Opt_rgrplvb,
1369 Opt_loccookie,
1370 };
1371
1372 static const struct constant_table gfs2_param_quota[] = {
1373 {"off", GFS2_QUOTA_OFF},
1374 {"account", GFS2_QUOTA_ACCOUNT},
1375 {"on", GFS2_QUOTA_ON},
1376 {}
1377 };
1378
1379 enum opt_data {
1380 Opt_data_writeback = GFS2_DATA_WRITEBACK,
1381 Opt_data_ordered = GFS2_DATA_ORDERED,
1382 };
1383
1384 static const struct constant_table gfs2_param_data[] = {
1385 {"writeback", Opt_data_writeback },
1386 {"ordered", Opt_data_ordered },
1387 {}
1388 };
1389
1390 enum opt_errors {
1391 Opt_errors_withdraw = GFS2_ERRORS_WITHDRAW,
1392 Opt_errors_panic = GFS2_ERRORS_PANIC,
1393 };
1394
1395 static const struct constant_table gfs2_param_errors[] = {
1396 {"withdraw", Opt_errors_withdraw },
1397 {"panic", Opt_errors_panic },
1398 {}
1399 };
1400
1401 static const struct fs_parameter_spec gfs2_fs_parameters[] = {
1402 fsparam_string ("lockproto", Opt_lockproto),
1403 fsparam_string ("locktable", Opt_locktable),
1404 fsparam_string ("hostdata", Opt_hostdata),
1405 fsparam_flag ("spectator", Opt_spectator),
1406 fsparam_flag ("norecovery", Opt_spectator),
1407 fsparam_flag ("ignore_local_fs", Opt_ignore_local_fs),
1408 fsparam_flag ("localflocks", Opt_localflocks),
1409 fsparam_flag ("localcaching", Opt_localcaching),
1410 fsparam_flag_no("debug", Opt_debug),
1411 fsparam_flag ("upgrade", Opt_upgrade),
1412 fsparam_flag_no("acl", Opt_acl),
1413 fsparam_flag_no("suiddir", Opt_suiddir),
1414 fsparam_enum ("data", Opt_data, gfs2_param_data),
1415 fsparam_flag ("meta", Opt_meta),
1416 fsparam_flag_no("discard", Opt_discard),
1417 fsparam_s32 ("commit", Opt_commit),
1418 fsparam_enum ("errors", Opt_errors, gfs2_param_errors),
1419 fsparam_s32 ("statfs_quantum", Opt_statfs_quantum),
1420 fsparam_s32 ("statfs_percent", Opt_statfs_percent),
1421 fsparam_s32 ("quota_quantum", Opt_quota_quantum),
1422 fsparam_flag_no("barrier", Opt_barrier),
1423 fsparam_flag_no("rgrplvb", Opt_rgrplvb),
1424 fsparam_flag_no("loccookie", Opt_loccookie),
1425 /* quota can be a flag or an enum so it gets special treatment */
1426 fsparam_flag_no("quota", Opt_quota_flag),
1427 fsparam_enum("quota", Opt_quota, gfs2_param_quota),
1428 {}
1429 };
1430
1431 /* Parse a single mount parameter */
1432 static int gfs2_parse_param(struct fs_context *fc, struct fs_parameter *param)
1433 {
1434 struct gfs2_args *args = fc->fs_private;
1435 struct fs_parse_result result;
1436 int o;
1437
1438 o = fs_parse(fc, gfs2_fs_parameters, param, &result);
1439 if (o < 0)
1440 return o;
1441
1442 switch (o) {
1443 case Opt_lockproto:
1444 strlcpy(args->ar_lockproto, param->string, GFS2_LOCKNAME_LEN);
1445 break;
1446 case Opt_locktable:
1447 strlcpy(args->ar_locktable, param->string, GFS2_LOCKNAME_LEN);
1448 break;
1449 case Opt_hostdata:
1450 strlcpy(args->ar_hostdata, param->string, GFS2_LOCKNAME_LEN);
1451 break;
1452 case Opt_spectator:
1453 args->ar_spectator = 1;
1454 break;
1455 case Opt_ignore_local_fs:
1456 /* Retained for backwards compat only */
1457 break;
1458 case Opt_localflocks:
1459 args->ar_localflocks = 1;
1460 break;
1461 case Opt_localcaching:
1462 /* Retained for backwards compat only */
1463 break;
1464 case Opt_debug:
1465 if (result.boolean && args->ar_errors == GFS2_ERRORS_PANIC)
1466 return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive");
1467 args->ar_debug = result.boolean;
1468 break;
1469 case Opt_upgrade:
1470 /* Retained for backwards compat only */
1471 break;
1472 case Opt_acl:
1473 args->ar_posix_acl = result.boolean;
1474 break;
1475 case Opt_quota_flag:
1476 args->ar_quota = result.negated ? GFS2_QUOTA_OFF : GFS2_QUOTA_ON;
1477 break;
1478 case Opt_quota:
1479 args->ar_quota = result.int_32;
1480 break;
1481 case Opt_suiddir:
1482 args->ar_suiddir = result.boolean;
1483 break;
1484 case Opt_data:
1485 /* The uint_32 result maps directly to GFS2_DATA_* */
1486 args->ar_data = result.uint_32;
1487 break;
1488 case Opt_meta:
1489 args->ar_meta = 1;
1490 break;
1491 case Opt_discard:
1492 args->ar_discard = result.boolean;
1493 break;
1494 case Opt_commit:
1495 if (result.int_32 <= 0)
1496 return invalfc(fc, "commit mount option requires a positive numeric argument");
1497 args->ar_commit = result.int_32;
1498 break;
1499 case Opt_statfs_quantum:
1500 if (result.int_32 < 0)
1501 return invalfc(fc, "statfs_quantum mount option requires a non-negative numeric argument");
1502 args->ar_statfs_quantum = result.int_32;
1503 break;
1504 case Opt_quota_quantum:
1505 if (result.int_32 <= 0)
1506 return invalfc(fc, "quota_quantum mount option requires a positive numeric argument");
1507 args->ar_quota_quantum = result.int_32;
1508 break;
1509 case Opt_statfs_percent:
1510 if (result.int_32 < 0 || result.int_32 > 100)
1511 return invalfc(fc, "statfs_percent mount option requires a numeric argument between 0 and 100");
1512 args->ar_statfs_percent = result.int_32;
1513 break;
1514 case Opt_errors:
1515 if (args->ar_debug && result.uint_32 == GFS2_ERRORS_PANIC)
1516 return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive");
1517 args->ar_errors = result.uint_32;
1518 break;
1519 case Opt_barrier:
1520 args->ar_nobarrier = result.boolean;
1521 break;
1522 case Opt_rgrplvb:
1523 args->ar_rgrplvb = result.boolean;
1524 args->ar_got_rgrplvb = 1;
1525 break;
1526 case Opt_loccookie:
1527 args->ar_loccookie = result.boolean;
1528 break;
1529 default:
1530 return invalfc(fc, "invalid mount option: %s", param->key);
1531 }
1532 return 0;
1533 }
1534
1535 static int gfs2_reconfigure(struct fs_context *fc)
1536 {
1537 struct super_block *sb = fc->root->d_sb;
1538 struct gfs2_sbd *sdp = sb->s_fs_info;
1539 struct gfs2_args *oldargs = &sdp->sd_args;
1540 struct gfs2_args *newargs = fc->fs_private;
1541 struct gfs2_tune *gt = &sdp->sd_tune;
1542 int error = 0;
1543
1544 sync_filesystem(sb);
1545
1546 spin_lock(&gt->gt_spin);
1547 oldargs->ar_commit = gt->gt_logd_secs;
1548 oldargs->ar_quota_quantum = gt->gt_quota_quantum;
1549 if (gt->gt_statfs_slow)
1550 oldargs->ar_statfs_quantum = 0;
1551 else
1552 oldargs->ar_statfs_quantum = gt->gt_statfs_quantum;
1553 spin_unlock(&gt->gt_spin);
1554
1555 if (strcmp(newargs->ar_lockproto, oldargs->ar_lockproto)) {
1556 errorfc(fc, "reconfiguration of locking protocol not allowed");
1557 return -EINVAL;
1558 }
1559 if (strcmp(newargs->ar_locktable, oldargs->ar_locktable)) {
1560 errorfc(fc, "reconfiguration of lock table not allowed");
1561 return -EINVAL;
1562 }
1563 if (strcmp(newargs->ar_hostdata, oldargs->ar_hostdata)) {
1564 errorfc(fc, "reconfiguration of host data not allowed");
1565 return -EINVAL;
1566 }
1567 if (newargs->ar_spectator != oldargs->ar_spectator) {
1568 errorfc(fc, "reconfiguration of spectator mode not allowed");
1569 return -EINVAL;
1570 }
1571 if (newargs->ar_localflocks != oldargs->ar_localflocks) {
1572 errorfc(fc, "reconfiguration of localflocks not allowed");
1573 return -EINVAL;
1574 }
1575 if (newargs->ar_meta != oldargs->ar_meta) {
1576 errorfc(fc, "switching between gfs2 and gfs2meta not allowed");
1577 return -EINVAL;
1578 }
1579 if (oldargs->ar_spectator)
1580 fc->sb_flags |= SB_RDONLY;
1581
1582 if ((sb->s_flags ^ fc->sb_flags) & SB_RDONLY) {
1583 struct gfs2_holder freeze_gh;
1584
1585 error = gfs2_freeze_lock(sdp, &freeze_gh, 0);
1586 if (error)
1587 return -EINVAL;
1588
1589 if (fc->sb_flags & SB_RDONLY) {
1590 gfs2_make_fs_ro(sdp);
1591 } else {
1592 error = gfs2_make_fs_rw(sdp);
1593 if (error)
1594 errorfc(fc, "unable to remount read-write");
1595 }
1596 gfs2_freeze_unlock(&freeze_gh);
1597 }
1598 sdp->sd_args = *newargs;
1599
1600 if (sdp->sd_args.ar_posix_acl)
1601 sb->s_flags |= SB_POSIXACL;
1602 else
1603 sb->s_flags &= ~SB_POSIXACL;
1604 if (sdp->sd_args.ar_nobarrier)
1605 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1606 else
1607 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1608 spin_lock(&gt->gt_spin);
1609 gt->gt_logd_secs = newargs->ar_commit;
1610 gt->gt_quota_quantum = newargs->ar_quota_quantum;
1611 if (newargs->ar_statfs_quantum) {
1612 gt->gt_statfs_slow = 0;
1613 gt->gt_statfs_quantum = newargs->ar_statfs_quantum;
1614 }
1615 else {
1616 gt->gt_statfs_slow = 1;
1617 gt->gt_statfs_quantum = 30;
1618 }
1619 spin_unlock(&gt->gt_spin);
1620
1621 gfs2_online_uevent(sdp);
1622 return error;
1623 }
1624
1625 static const struct fs_context_operations gfs2_context_ops = {
1626 .free = gfs2_fc_free,
1627 .parse_param = gfs2_parse_param,
1628 .get_tree = gfs2_get_tree,
1629 .reconfigure = gfs2_reconfigure,
1630 };
1631
1632 /* Set up the filesystem mount context */
1633 static int gfs2_init_fs_context(struct fs_context *fc)
1634 {
1635 struct gfs2_args *args;
1636
1637 args = kmalloc(sizeof(*args), GFP_KERNEL);
1638 if (args == NULL)
1639 return -ENOMEM;
1640
1641 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
1642 struct gfs2_sbd *sdp = fc->root->d_sb->s_fs_info;
1643
1644 *args = sdp->sd_args;
1645 } else {
1646 memset(args, 0, sizeof(*args));
1647 args->ar_quota = GFS2_QUOTA_DEFAULT;
1648 args->ar_data = GFS2_DATA_DEFAULT;
1649 args->ar_commit = 30;
1650 args->ar_statfs_quantum = 30;
1651 args->ar_quota_quantum = 60;
1652 args->ar_errors = GFS2_ERRORS_DEFAULT;
1653 }
1654 fc->fs_private = args;
1655 fc->ops = &gfs2_context_ops;
1656 return 0;
1657 }
1658
1659 static int set_meta_super(struct super_block *s, struct fs_context *fc)
1660 {
1661 return -EINVAL;
1662 }
1663
1664 static int test_meta_super(struct super_block *s, struct fs_context *fc)
1665 {
1666 return (fc->sget_key == s->s_bdev);
1667 }
1668
1669 static int gfs2_meta_get_tree(struct fs_context *fc)
1670 {
1671 struct super_block *s;
1672 struct gfs2_sbd *sdp;
1673 struct path path;
1674 int error;
1675
1676 if (!fc->source || !*fc->source)
1677 return -EINVAL;
1678
1679 error = kern_path(fc->source, LOOKUP_FOLLOW, &path);
1680 if (error) {
1681 pr_warn("path_lookup on %s returned error %d\n",
1682 fc->source, error);
1683 return error;
1684 }
1685 fc->fs_type = &gfs2_fs_type;
1686 fc->sget_key = path.dentry->d_sb->s_bdev;
1687 s = sget_fc(fc, test_meta_super, set_meta_super);
1688 path_put(&path);
1689 if (IS_ERR(s)) {
1690 pr_warn("gfs2 mount does not exist\n");
1691 return PTR_ERR(s);
1692 }
1693 if ((fc->sb_flags ^ s->s_flags) & SB_RDONLY) {
1694 deactivate_locked_super(s);
1695 return -EBUSY;
1696 }
1697 sdp = s->s_fs_info;
1698 fc->root = dget(sdp->sd_master_dir);
1699 return 0;
1700 }
1701
1702 static const struct fs_context_operations gfs2_meta_context_ops = {
1703 .free = gfs2_fc_free,
1704 .get_tree = gfs2_meta_get_tree,
1705 };
1706
1707 static int gfs2_meta_init_fs_context(struct fs_context *fc)
1708 {
1709 int ret = gfs2_init_fs_context(fc);
1710
1711 if (ret)
1712 return ret;
1713
1714 fc->ops = &gfs2_meta_context_ops;
1715 return 0;
1716 }
1717
1718 static void gfs2_kill_sb(struct super_block *sb)
1719 {
1720 struct gfs2_sbd *sdp = sb->s_fs_info;
1721
1722 if (sdp == NULL) {
1723 kill_block_super(sb);
1724 return;
1725 }
1726
1727 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SYNC | GFS2_LFC_KILL_SB);
1728 dput(sdp->sd_root_dir);
1729 dput(sdp->sd_master_dir);
1730 sdp->sd_root_dir = NULL;
1731 sdp->sd_master_dir = NULL;
1732 shrink_dcache_sb(sb);
1733 kill_block_super(sb);
1734 }
1735
1736 struct file_system_type gfs2_fs_type = {
1737 .name = "gfs2",
1738 .fs_flags = FS_REQUIRES_DEV,
1739 .init_fs_context = gfs2_init_fs_context,
1740 .parameters = gfs2_fs_parameters,
1741 .kill_sb = gfs2_kill_sb,
1742 .owner = THIS_MODULE,
1743 };
1744 MODULE_ALIAS_FS("gfs2");
1745
1746 struct file_system_type gfs2meta_fs_type = {
1747 .name = "gfs2meta",
1748 .fs_flags = FS_REQUIRES_DEV,
1749 .init_fs_context = gfs2_meta_init_fs_context,
1750 .owner = THIS_MODULE,
1751 };
1752 MODULE_ALIAS_FS("gfs2meta");
Michael's Linux tree.