1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
4 * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
5 */
6
7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
8
9 #include <linux/sched.h>
10 #include <linux/slab.h>
11 #include <linux/spinlock.h>
12 #include <linux/completion.h>
13 #include <linux/buffer_head.h>
14 #include <linux/blkdev.h>
15 #include <linux/kthread.h>
16 #include <linux/export.h>
17 #include <linux/namei.h>
18 #include <linux/mount.h>
19 #include <linux/gfs2_ondisk.h>
20 #include <linux/quotaops.h>
21 #include <linux/lockdep.h>
22 #include <linux/module.h>
23 #include <linux/backing-dev.h>
24 #include <linux/fs_parser.h>
25
26 #include "gfs2.h"
27 #include "incore.h"
28 #include "bmap.h"
29 #include "glock.h"
30 #include "glops.h"
31 #include "inode.h"
32 #include "recovery.h"
33 #include "rgrp.h"
34 #include "super.h"
35 #include "sys.h"
36 #include "util.h"
37 #include "log.h"
38 #include "quota.h"
39 #include "dir.h"
40 #include "meta_io.h"
41 #include "trace_gfs2.h"
42 #include "lops.h"
43
44 #define DO 0
45 #define UNDO 1
46
47 /**
48 * gfs2_tune_init - Fill a gfs2_tune structure with default values
49 * @gt: tune
50 *
51 */
52
gfs2_tune_init(struct gfs2_tune * gt)53 static void gfs2_tune_init(struct gfs2_tune *gt)
54 {
55 spin_lock_init(>->gt_spin);
56
57 gt->gt_quota_warn_period = 10;
58 gt->gt_quota_scale_num = 1;
59 gt->gt_quota_scale_den = 1;
60 gt->gt_new_files_jdata = 0;
61 gt->gt_max_readahead = BIT(18);
62 gt->gt_complain_secs = 10;
63 }
64
free_sbd(struct gfs2_sbd * sdp)65 void free_sbd(struct gfs2_sbd *sdp)
66 {
67 if (sdp->sd_lkstats)
68 free_percpu(sdp->sd_lkstats);
69 kfree(sdp);
70 }
71
init_sbd(struct super_block * sb)72 static struct gfs2_sbd *init_sbd(struct super_block *sb)
73 {
74 struct gfs2_sbd *sdp;
75 struct address_space *mapping;
76
77 sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL);
78 if (!sdp)
79 return NULL;
80
81 sdp->sd_vfs = sb;
82 sdp->sd_lkstats = alloc_percpu(struct gfs2_pcpu_lkstats);
83 if (!sdp->sd_lkstats)
84 goto fail;
85 sb->s_fs_info = sdp;
86
87 set_bit(SDF_NOJOURNALID, &sdp->sd_flags);
88 gfs2_tune_init(&sdp->sd_tune);
89
90 init_waitqueue_head(&sdp->sd_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 mapping = &sdp->sd_aspace;
114
115 address_space_init_once(mapping);
116 mapping->a_ops = &gfs2_rgrp_aops;
117 mapping->host = sb->s_bdev->bd_inode;
118 mapping->flags = 0;
119 mapping_set_gfp_mask(mapping, GFP_NOFS);
120 mapping->private_data = NULL;
121 mapping->writeback_index = 0;
122
123 spin_lock_init(&sdp->sd_log_lock);
124 atomic_set(&sdp->sd_log_pinned, 0);
125 INIT_LIST_HEAD(&sdp->sd_log_revokes);
126 INIT_LIST_HEAD(&sdp->sd_log_ordered);
127 spin_lock_init(&sdp->sd_ordered_lock);
128
129 init_waitqueue_head(&sdp->sd_log_waitq);
130 init_waitqueue_head(&sdp->sd_logd_waitq);
131 spin_lock_init(&sdp->sd_ail_lock);
132 INIT_LIST_HEAD(&sdp->sd_ail1_list);
133 INIT_LIST_HEAD(&sdp->sd_ail2_list);
134
135 init_rwsem(&sdp->sd_log_flush_lock);
136 atomic_set(&sdp->sd_log_in_flight, 0);
137 atomic_set(&sdp->sd_reserving_log, 0);
138 init_waitqueue_head(&sdp->sd_reserving_log_wait);
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 * @sb: The superblock
154 * @silent: Don't print a message if the check fails
155 *
156 * Checks the version code of the FS is one that we understand how to
157 * read and that the sizes of the various on-disk structures have not
158 * changed.
159 */
160
gfs2_check_sb(struct gfs2_sbd * sdp,int silent)161 static int gfs2_check_sb(struct gfs2_sbd *sdp, int silent)
162 {
163 struct gfs2_sb_host *sb = &sdp->sd_sb;
164
165 if (sb->sb_magic != GFS2_MAGIC ||
166 sb->sb_type != GFS2_METATYPE_SB) {
167 if (!silent)
168 pr_warn("not a GFS2 filesystem\n");
169 return -EINVAL;
170 }
171
172 /* If format numbers match exactly, we're done. */
173
174 if (sb->sb_fs_format == GFS2_FORMAT_FS &&
175 sb->sb_multihost_format == GFS2_FORMAT_MULTI)
176 return 0;
177
178 fs_warn(sdp, "Unknown on-disk format, unable to mount\n");
179
180 return -EINVAL;
181 }
182
end_bio_io_page(struct bio * bio)183 static void end_bio_io_page(struct bio *bio)
184 {
185 struct page *page = bio->bi_private;
186
187 if (!bio->bi_status)
188 SetPageUptodate(page);
189 else
190 pr_warn("error %d reading superblock\n", bio->bi_status);
191 unlock_page(page);
192 }
193
gfs2_sb_in(struct gfs2_sbd * sdp,const void * buf)194 static void gfs2_sb_in(struct gfs2_sbd *sdp, const void *buf)
195 {
196 struct gfs2_sb_host *sb = &sdp->sd_sb;
197 struct super_block *s = sdp->sd_vfs;
198 const struct gfs2_sb *str = buf;
199
200 sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic);
201 sb->sb_type = be32_to_cpu(str->sb_header.mh_type);
202 sb->sb_format = be32_to_cpu(str->sb_header.mh_format);
203 sb->sb_fs_format = be32_to_cpu(str->sb_fs_format);
204 sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format);
205 sb->sb_bsize = be32_to_cpu(str->sb_bsize);
206 sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift);
207 sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr);
208 sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino);
209 sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr);
210 sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino);
211
212 memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN);
213 memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN);
214 memcpy(&s->s_uuid, str->sb_uuid, 16);
215 }
216
217 /**
218 * gfs2_read_super - Read the gfs2 super block from disk
219 * @sdp: The GFS2 super block
220 * @sector: The location of the super block
221 * @error: The error code to return
222 *
223 * This uses the bio functions to read the super block from disk
224 * because we want to be 100% sure that we never read cached data.
225 * A super block is read twice only during each GFS2 mount and is
226 * never written to by the filesystem. The first time its read no
227 * locks are held, and the only details which are looked at are those
228 * relating to the locking protocol. Once locking is up and working,
229 * the sb is read again under the lock to establish the location of
230 * the master directory (contains pointers to journals etc) and the
231 * root directory.
232 *
233 * Returns: 0 on success or error
234 */
235
gfs2_read_super(struct gfs2_sbd * sdp,sector_t sector,int silent)236 static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector, int silent)
237 {
238 struct super_block *sb = sdp->sd_vfs;
239 struct gfs2_sb *p;
240 struct page *page;
241 struct bio *bio;
242
243 page = alloc_page(GFP_NOFS);
244 if (unlikely(!page))
245 return -ENOMEM;
246
247 ClearPageUptodate(page);
248 ClearPageDirty(page);
249 lock_page(page);
250
251 bio = bio_alloc(GFP_NOFS, 1);
252 bio->bi_iter.bi_sector = sector * (sb->s_blocksize >> 9);
253 bio_set_dev(bio, sb->s_bdev);
254 bio_add_page(bio, page, PAGE_SIZE, 0);
255
256 bio->bi_end_io = end_bio_io_page;
257 bio->bi_private = page;
258 bio_set_op_attrs(bio, REQ_OP_READ, REQ_META);
259 submit_bio(bio);
260 wait_on_page_locked(page);
261 bio_put(bio);
262 if (!PageUptodate(page)) {
263 __free_page(page);
264 return -EIO;
265 }
266 p = kmap(page);
267 gfs2_sb_in(sdp, p);
268 kunmap(page);
269 __free_page(page);
270 return gfs2_check_sb(sdp, silent);
271 }
272
273 /**
274 * gfs2_read_sb - Read super block
275 * @sdp: The GFS2 superblock
276 * @silent: Don't print message if mount fails
277 *
278 */
279
gfs2_read_sb(struct gfs2_sbd * sdp,int silent)280 static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent)
281 {
282 u32 hash_blocks, ind_blocks, leaf_blocks;
283 u32 tmp_blocks;
284 unsigned int x;
285 int error;
286
287 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
288 if (error) {
289 if (!silent)
290 fs_err(sdp, "can't read superblock\n");
291 return error;
292 }
293
294 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
295 GFS2_BASIC_BLOCK_SHIFT;
296 sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift);
297 sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
298 sizeof(struct gfs2_dinode)) / sizeof(u64);
299 sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
300 sizeof(struct gfs2_meta_header)) / sizeof(u64);
301 sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
302 sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
303 sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
304 sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64);
305 sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
306 sizeof(struct gfs2_meta_header)) /
307 sizeof(struct gfs2_quota_change);
308 sdp->sd_blocks_per_bitmap = (sdp->sd_sb.sb_bsize -
309 sizeof(struct gfs2_meta_header))
310 * GFS2_NBBY; /* not the rgrp bitmap, subsequent bitmaps only */
311
312 /* Compute maximum reservation required to add a entry to a directory */
313
314 hash_blocks = DIV_ROUND_UP(sizeof(u64) * BIT(GFS2_DIR_MAX_DEPTH),
315 sdp->sd_jbsize);
316
317 ind_blocks = 0;
318 for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
319 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
320 ind_blocks += tmp_blocks;
321 }
322
323 leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
324
325 sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
326
327 sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
328 sizeof(struct gfs2_dinode);
329 sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
330 for (x = 2;; x++) {
331 u64 space, d;
332 u32 m;
333
334 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
335 d = space;
336 m = do_div(d, sdp->sd_inptrs);
337
338 if (d != sdp->sd_heightsize[x - 1] || m)
339 break;
340 sdp->sd_heightsize[x] = space;
341 }
342 sdp->sd_max_height = x;
343 sdp->sd_heightsize[x] = ~0;
344 gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
345
346 sdp->sd_max_dents_per_leaf = (sdp->sd_sb.sb_bsize -
347 sizeof(struct gfs2_leaf)) /
348 GFS2_MIN_DIRENT_SIZE;
349 return 0;
350 }
351
init_names(struct gfs2_sbd * sdp,int silent)352 static int init_names(struct gfs2_sbd *sdp, int silent)
353 {
354 char *proto, *table;
355 int error = 0;
356
357 proto = sdp->sd_args.ar_lockproto;
358 table = sdp->sd_args.ar_locktable;
359
360 /* Try to autodetect */
361
362 if (!proto[0] || !table[0]) {
363 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
364 if (error)
365 return error;
366
367 if (!proto[0])
368 proto = sdp->sd_sb.sb_lockproto;
369 if (!table[0])
370 table = sdp->sd_sb.sb_locktable;
371 }
372
373 if (!table[0])
374 table = sdp->sd_vfs->s_id;
375
376 strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN);
377 strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN);
378
379 table = sdp->sd_table_name;
380 while ((table = strchr(table, '/')))
381 *table = '_';
382
383 return error;
384 }
385
init_locking(struct gfs2_sbd * sdp,struct gfs2_holder * mount_gh,int undo)386 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
387 int undo)
388 {
389 int error = 0;
390
391 if (undo)
392 goto fail_trans;
393
394 error = gfs2_glock_nq_num(sdp,
395 GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
396 LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
397 mount_gh);
398 if (error) {
399 fs_err(sdp, "can't acquire mount glock: %d\n", error);
400 goto fail;
401 }
402
403 error = gfs2_glock_nq_num(sdp,
404 GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
405 LM_ST_SHARED,
406 LM_FLAG_NOEXP | GL_EXACT,
407 &sdp->sd_live_gh);
408 if (error) {
409 fs_err(sdp, "can't acquire live glock: %d\n", error);
410 goto fail_mount;
411 }
412
413 error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
414 CREATE, &sdp->sd_rename_gl);
415 if (error) {
416 fs_err(sdp, "can't create rename glock: %d\n", error);
417 goto fail_live;
418 }
419
420 error = gfs2_glock_get(sdp, GFS2_FREEZE_LOCK, &gfs2_freeze_glops,
421 CREATE, &sdp->sd_freeze_gl);
422 if (error) {
423 fs_err(sdp, "can't create transaction glock: %d\n", error);
424 goto fail_rename;
425 }
426
427 return 0;
428
429 fail_trans:
430 gfs2_glock_put(sdp->sd_freeze_gl);
431 fail_rename:
432 gfs2_glock_put(sdp->sd_rename_gl);
433 fail_live:
434 gfs2_glock_dq_uninit(&sdp->sd_live_gh);
435 fail_mount:
436 gfs2_glock_dq_uninit(mount_gh);
437 fail:
438 return error;
439 }
440
gfs2_lookup_root(struct super_block * sb,struct dentry ** dptr,u64 no_addr,const char * name)441 static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr,
442 u64 no_addr, const char *name)
443 {
444 struct gfs2_sbd *sdp = sb->s_fs_info;
445 struct dentry *dentry;
446 struct inode *inode;
447
448 inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0,
449 GFS2_BLKST_FREE /* ignore */);
450 if (IS_ERR(inode)) {
451 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode));
452 return PTR_ERR(inode);
453 }
454 dentry = d_make_root(inode);
455 if (!dentry) {
456 fs_err(sdp, "can't alloc %s dentry\n", name);
457 return -ENOMEM;
458 }
459 *dptr = dentry;
460 return 0;
461 }
462
init_sb(struct gfs2_sbd * sdp,int silent)463 static int init_sb(struct gfs2_sbd *sdp, int silent)
464 {
465 struct super_block *sb = sdp->sd_vfs;
466 struct gfs2_holder sb_gh;
467 u64 no_addr;
468 int ret;
469
470 ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
471 LM_ST_SHARED, 0, &sb_gh);
472 if (ret) {
473 fs_err(sdp, "can't acquire superblock glock: %d\n", ret);
474 return ret;
475 }
476
477 ret = gfs2_read_sb(sdp, silent);
478 if (ret) {
479 fs_err(sdp, "can't read superblock: %d\n", ret);
480 goto out;
481 }
482
483 /* Set up the buffer cache and SB for real */
484 if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) {
485 ret = -EINVAL;
486 fs_err(sdp, "FS block size (%u) is too small for device "
487 "block size (%u)\n",
488 sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev));
489 goto out;
490 }
491 if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
492 ret = -EINVAL;
493 fs_err(sdp, "FS block size (%u) is too big for machine "
494 "page size (%u)\n",
495 sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
496 goto out;
497 }
498 sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
499
500 /* Get the root inode */
501 no_addr = sdp->sd_sb.sb_root_dir.no_addr;
502 ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root");
503 if (ret)
504 goto out;
505
506 /* Get the master inode */
507 no_addr = sdp->sd_sb.sb_master_dir.no_addr;
508 ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master");
509 if (ret) {
510 dput(sdp->sd_root_dir);
511 goto out;
512 }
513 sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir);
514 out:
515 gfs2_glock_dq_uninit(&sb_gh);
516 return ret;
517 }
518
gfs2_others_may_mount(struct gfs2_sbd * sdp)519 static void gfs2_others_may_mount(struct gfs2_sbd *sdp)
520 {
521 char *message = "FIRSTMOUNT=Done";
522 char *envp[] = { message, NULL };
523
524 fs_info(sdp, "first mount done, others may mount\n");
525
526 if (sdp->sd_lockstruct.ls_ops->lm_first_done)
527 sdp->sd_lockstruct.ls_ops->lm_first_done(sdp);
528
529 kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp);
530 }
531
532 /**
533 * gfs2_jindex_hold - Grab a lock on the jindex
534 * @sdp: The GFS2 superblock
535 * @ji_gh: the holder for the jindex glock
536 *
537 * Returns: errno
538 */
539
gfs2_jindex_hold(struct gfs2_sbd * sdp,struct gfs2_holder * ji_gh)540 static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
541 {
542 struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex);
543 struct qstr name;
544 char buf[20];
545 struct gfs2_jdesc *jd;
546 int error;
547
548 name.name = buf;
549
550 mutex_lock(&sdp->sd_jindex_mutex);
551
552 for (;;) {
553 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh);
554 if (error)
555 break;
556
557 name.len = sprintf(buf, "journal%u", sdp->sd_journals);
558 name.hash = gfs2_disk_hash(name.name, name.len);
559
560 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL);
561 if (error == -ENOENT) {
562 error = 0;
563 break;
564 }
565
566 gfs2_glock_dq_uninit(ji_gh);
567
568 if (error)
569 break;
570
571 error = -ENOMEM;
572 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
573 if (!jd)
574 break;
575
576 INIT_LIST_HEAD(&jd->extent_list);
577 INIT_LIST_HEAD(&jd->jd_revoke_list);
578
579 INIT_WORK(&jd->jd_work, gfs2_recover_func);
580 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1);
581 if (IS_ERR_OR_NULL(jd->jd_inode)) {
582 if (!jd->jd_inode)
583 error = -ENOENT;
584 else
585 error = PTR_ERR(jd->jd_inode);
586 kfree(jd);
587 break;
588 }
589
590 spin_lock(&sdp->sd_jindex_spin);
591 jd->jd_jid = sdp->sd_journals++;
592 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
593 spin_unlock(&sdp->sd_jindex_spin);
594 }
595
596 mutex_unlock(&sdp->sd_jindex_mutex);
597
598 return error;
599 }
600
601 /**
602 * check_journal_clean - Make sure a journal is clean for a spectator mount
603 * @sdp: The GFS2 superblock
604 * @jd: The journal descriptor
605 *
606 * Returns: 0 if the journal is clean or locked, else an error
607 */
check_journal_clean(struct gfs2_sbd * sdp,struct gfs2_jdesc * jd)608 static int check_journal_clean(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd)
609 {
610 int error;
611 struct gfs2_holder j_gh;
612 struct gfs2_log_header_host head;
613 struct gfs2_inode *ip;
614
615 ip = GFS2_I(jd->jd_inode);
616 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_NOEXP |
617 GL_EXACT | GL_NOCACHE, &j_gh);
618 if (error) {
619 fs_err(sdp, "Error locking journal for spectator mount.\n");
620 return -EPERM;
621 }
622 error = gfs2_jdesc_check(jd);
623 if (error) {
624 fs_err(sdp, "Error checking journal for spectator mount.\n");
625 goto out_unlock;
626 }
627 error = gfs2_find_jhead(jd, &head, false);
628 if (error) {
629 fs_err(sdp, "Error parsing journal for spectator mount.\n");
630 goto out_unlock;
631 }
632 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
633 error = -EPERM;
634 fs_err(sdp, "jid=%u: Journal is dirty, so the first mounter "
635 "must not be a spectator.\n", jd->jd_jid);
636 }
637
638 out_unlock:
639 gfs2_glock_dq_uninit(&j_gh);
640 return error;
641 }
642
init_journal(struct gfs2_sbd * sdp,int undo)643 static int init_journal(struct gfs2_sbd *sdp, int undo)
644 {
645 struct inode *master = d_inode(sdp->sd_master_dir);
646 struct gfs2_holder ji_gh;
647 struct gfs2_inode *ip;
648 int jindex = 1;
649 int error = 0;
650
651 if (undo) {
652 jindex = 0;
653 goto fail_jinode_gh;
654 }
655
656 sdp->sd_jindex = gfs2_lookup_simple(master, "jindex");
657 if (IS_ERR(sdp->sd_jindex)) {
658 fs_err(sdp, "can't lookup journal index: %d\n", error);
659 return PTR_ERR(sdp->sd_jindex);
660 }
661
662 /* Load in the journal index special file */
663
664 error = gfs2_jindex_hold(sdp, &ji_gh);
665 if (error) {
666 fs_err(sdp, "can't read journal index: %d\n", error);
667 goto fail;
668 }
669
670 error = -EUSERS;
671 if (!gfs2_jindex_size(sdp)) {
672 fs_err(sdp, "no journals!\n");
673 goto fail_jindex;
674 }
675
676 atomic_set(&sdp->sd_log_blks_needed, 0);
677 if (sdp->sd_args.ar_spectator) {
678 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
679 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
680 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
681 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
682 } else {
683 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
684 fs_err(sdp, "can't mount journal #%u\n",
685 sdp->sd_lockstruct.ls_jid);
686 fs_err(sdp, "there are only %u journals (0 - %u)\n",
687 gfs2_jindex_size(sdp),
688 gfs2_jindex_size(sdp) - 1);
689 goto fail_jindex;
690 }
691 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
692
693 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
694 &gfs2_journal_glops,
695 LM_ST_EXCLUSIVE, LM_FLAG_NOEXP,
696 &sdp->sd_journal_gh);
697 if (error) {
698 fs_err(sdp, "can't acquire journal glock: %d\n", error);
699 goto fail_jindex;
700 }
701
702 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
703 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
704 LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE,
705 &sdp->sd_jinode_gh);
706 if (error) {
707 fs_err(sdp, "can't acquire journal inode glock: %d\n",
708 error);
709 goto fail_journal_gh;
710 }
711
712 error = gfs2_jdesc_check(sdp->sd_jdesc);
713 if (error) {
714 fs_err(sdp, "my journal (%u) is bad: %d\n",
715 sdp->sd_jdesc->jd_jid, error);
716 goto fail_jinode_gh;
717 }
718 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
719 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
720 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
721
722 /* Map the extents for this journal's blocks */
723 gfs2_map_journal_extents(sdp, sdp->sd_jdesc);
724 }
725 trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free));
726
727 if (sdp->sd_lockstruct.ls_first) {
728 unsigned int x;
729 for (x = 0; x < sdp->sd_journals; x++) {
730 struct gfs2_jdesc *jd = gfs2_jdesc_find(sdp, x);
731
732 if (sdp->sd_args.ar_spectator) {
733 error = check_journal_clean(sdp, jd);
734 if (error)
735 goto fail_jinode_gh;
736 continue;
737 }
738 error = gfs2_recover_journal(jd, true);
739 if (error) {
740 fs_err(sdp, "error recovering journal %u: %d\n",
741 x, error);
742 goto fail_jinode_gh;
743 }
744 }
745
746 gfs2_others_may_mount(sdp);
747 } else if (!sdp->sd_args.ar_spectator) {
748 error = gfs2_recover_journal(sdp->sd_jdesc, true);
749 if (error) {
750 fs_err(sdp, "error recovering my journal: %d\n", error);
751 goto fail_jinode_gh;
752 }
753 }
754
755 sdp->sd_log_idle = 1;
756 set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
757 gfs2_glock_dq_uninit(&ji_gh);
758 jindex = 0;
759 INIT_WORK(&sdp->sd_freeze_work, gfs2_freeze_func);
760 return 0;
761
762 fail_jinode_gh:
763 if (!sdp->sd_args.ar_spectator)
764 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
765 fail_journal_gh:
766 if (!sdp->sd_args.ar_spectator)
767 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
768 fail_jindex:
769 gfs2_jindex_free(sdp);
770 if (jindex)
771 gfs2_glock_dq_uninit(&ji_gh);
772 fail:
773 iput(sdp->sd_jindex);
774 return error;
775 }
776
777 static struct lock_class_key gfs2_quota_imutex_key;
778
init_inodes(struct gfs2_sbd * sdp,int undo)779 static int init_inodes(struct gfs2_sbd *sdp, int undo)
780 {
781 int error = 0;
782 struct inode *master = d_inode(sdp->sd_master_dir);
783
784 if (undo)
785 goto fail_qinode;
786
787 error = init_journal(sdp, undo);
788 complete_all(&sdp->sd_journal_ready);
789 if (error)
790 goto fail;
791
792 /* Read in the master statfs inode */
793 sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs");
794 if (IS_ERR(sdp->sd_statfs_inode)) {
795 error = PTR_ERR(sdp->sd_statfs_inode);
796 fs_err(sdp, "can't read in statfs inode: %d\n", error);
797 goto fail_journal;
798 }
799
800 /* Read in the resource index inode */
801 sdp->sd_rindex = gfs2_lookup_simple(master, "rindex");
802 if (IS_ERR(sdp->sd_rindex)) {
803 error = PTR_ERR(sdp->sd_rindex);
804 fs_err(sdp, "can't get resource index inode: %d\n", error);
805 goto fail_statfs;
806 }
807 sdp->sd_rindex_uptodate = 0;
808
809 /* Read in the quota inode */
810 sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota");
811 if (IS_ERR(sdp->sd_quota_inode)) {
812 error = PTR_ERR(sdp->sd_quota_inode);
813 fs_err(sdp, "can't get quota file inode: %d\n", error);
814 goto fail_rindex;
815 }
816 /*
817 * i_rwsem on quota files is special. Since this inode is hidden system
818 * file, we are safe to define locking ourselves.
819 */
820 lockdep_set_class(&sdp->sd_quota_inode->i_rwsem,
821 &gfs2_quota_imutex_key);
822
823 error = gfs2_rindex_update(sdp);
824 if (error)
825 goto fail_qinode;
826
827 return 0;
828
829 fail_qinode:
830 iput(sdp->sd_quota_inode);
831 fail_rindex:
832 gfs2_clear_rgrpd(sdp);
833 iput(sdp->sd_rindex);
834 fail_statfs:
835 iput(sdp->sd_statfs_inode);
836 fail_journal:
837 init_journal(sdp, UNDO);
838 fail:
839 return error;
840 }
841
init_per_node(struct gfs2_sbd * sdp,int undo)842 static int init_per_node(struct gfs2_sbd *sdp, int undo)
843 {
844 struct inode *pn = NULL;
845 char buf[30];
846 int error = 0;
847 struct gfs2_inode *ip;
848 struct inode *master = d_inode(sdp->sd_master_dir);
849
850 if (sdp->sd_args.ar_spectator)
851 return 0;
852
853 if (undo)
854 goto fail_qc_gh;
855
856 pn = gfs2_lookup_simple(master, "per_node");
857 if (IS_ERR(pn)) {
858 error = PTR_ERR(pn);
859 fs_err(sdp, "can't find per_node directory: %d\n", error);
860 return error;
861 }
862
863 sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid);
864 sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf);
865 if (IS_ERR(sdp->sd_sc_inode)) {
866 error = PTR_ERR(sdp->sd_sc_inode);
867 fs_err(sdp, "can't find local \"sc\" file: %d\n", error);
868 goto fail;
869 }
870
871 sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
872 sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
873 if (IS_ERR(sdp->sd_qc_inode)) {
874 error = PTR_ERR(sdp->sd_qc_inode);
875 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
876 goto fail_ut_i;
877 }
878
879 iput(pn);
880 pn = NULL;
881
882 ip = GFS2_I(sdp->sd_sc_inode);
883 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
884 &sdp->sd_sc_gh);
885 if (error) {
886 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
887 goto fail_qc_i;
888 }
889
890 ip = GFS2_I(sdp->sd_qc_inode);
891 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
892 &sdp->sd_qc_gh);
893 if (error) {
894 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
895 goto fail_ut_gh;
896 }
897
898 return 0;
899
900 fail_qc_gh:
901 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
902 fail_ut_gh:
903 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
904 fail_qc_i:
905 iput(sdp->sd_qc_inode);
906 fail_ut_i:
907 iput(sdp->sd_sc_inode);
908 fail:
909 iput(pn);
910 return error;
911 }
912
913 static const match_table_t nolock_tokens = {
914 { Opt_jid, "jid=%d\n", },
915 { Opt_err, NULL },
916 };
917
918 static const struct lm_lockops nolock_ops = {
919 .lm_proto_name = "lock_nolock",
920 .lm_put_lock = gfs2_glock_free,
921 .lm_tokens = &nolock_tokens,
922 };
923
924 /**
925 * gfs2_lm_mount - mount a locking protocol
926 * @sdp: the filesystem
927 * @args: mount arguments
928 * @silent: if 1, don't complain if the FS isn't a GFS2 fs
929 *
930 * Returns: errno
931 */
932
gfs2_lm_mount(struct gfs2_sbd * sdp,int silent)933 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
934 {
935 const struct lm_lockops *lm;
936 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
937 struct gfs2_args *args = &sdp->sd_args;
938 const char *proto = sdp->sd_proto_name;
939 const char *table = sdp->sd_table_name;
940 char *o, *options;
941 int ret;
942
943 if (!strcmp("lock_nolock", proto)) {
944 lm = &nolock_ops;
945 sdp->sd_args.ar_localflocks = 1;
946 #ifdef CONFIG_GFS2_FS_LOCKING_DLM
947 } else if (!strcmp("lock_dlm", proto)) {
948 lm = &gfs2_dlm_ops;
949 #endif
950 } else {
951 pr_info("can't find protocol %s\n", proto);
952 return -ENOENT;
953 }
954
955 fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);
956
957 ls->ls_ops = lm;
958 ls->ls_first = 1;
959
960 for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) {
961 substring_t tmp[MAX_OPT_ARGS];
962 int token, option;
963
964 if (!o || !*o)
965 continue;
966
967 token = match_token(o, *lm->lm_tokens, tmp);
968 switch (token) {
969 case Opt_jid:
970 ret = match_int(&tmp[0], &option);
971 if (ret || option < 0)
972 goto hostdata_error;
973 if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags))
974 ls->ls_jid = option;
975 break;
976 case Opt_id:
977 case Opt_nodir:
978 /* Obsolete, but left for backward compat purposes */
979 break;
980 case Opt_first:
981 ret = match_int(&tmp[0], &option);
982 if (ret || (option != 0 && option != 1))
983 goto hostdata_error;
984 ls->ls_first = option;
985 break;
986 case Opt_err:
987 default:
988 hostdata_error:
989 fs_info(sdp, "unknown hostdata (%s)\n", o);
990 return -EINVAL;
991 }
992 }
993
994 if (lm->lm_mount == NULL) {
995 fs_info(sdp, "Now mounting FS...\n");
996 complete_all(&sdp->sd_locking_init);
997 return 0;
998 }
999 ret = lm->lm_mount(sdp, table);
1000 if (ret == 0)
1001 fs_info(sdp, "Joined cluster. Now mounting FS...\n");
1002 complete_all(&sdp->sd_locking_init);
1003 return ret;
1004 }
1005
gfs2_lm_unmount(struct gfs2_sbd * sdp)1006 void gfs2_lm_unmount(struct gfs2_sbd *sdp)
1007 {
1008 const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops;
1009 if (likely(!test_bit(SDF_WITHDRAWN, &sdp->sd_flags)) &&
1010 lm->lm_unmount)
1011 lm->lm_unmount(sdp);
1012 }
1013
wait_on_journal(struct gfs2_sbd * sdp)1014 static int wait_on_journal(struct gfs2_sbd *sdp)
1015 {
1016 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
1017 return 0;
1018
1019 return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, TASK_INTERRUPTIBLE)
1020 ? -EINTR : 0;
1021 }
1022
gfs2_online_uevent(struct gfs2_sbd * sdp)1023 void gfs2_online_uevent(struct gfs2_sbd *sdp)
1024 {
1025 struct super_block *sb = sdp->sd_vfs;
1026 char ro[20];
1027 char spectator[20];
1028 char *envp[] = { ro, spectator, NULL };
1029 sprintf(ro, "RDONLY=%d", sb_rdonly(sb));
1030 sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
1031 kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp);
1032 }
1033
1034 /**
1035 * gfs2_fill_super - Read in superblock
1036 * @sb: The VFS superblock
1037 * @args: Mount options
1038 * @silent: Don't complain if it's not a GFS2 filesystem
1039 *
1040 * Returns: -errno
1041 */
gfs2_fill_super(struct super_block * sb,struct fs_context * fc)1042 static int gfs2_fill_super(struct super_block *sb, struct fs_context *fc)
1043 {
1044 struct gfs2_args *args = fc->fs_private;
1045 int silent = fc->sb_flags & SB_SILENT;
1046 struct gfs2_sbd *sdp;
1047 struct gfs2_holder mount_gh;
1048 int error;
1049
1050 sdp = init_sbd(sb);
1051 if (!sdp) {
1052 pr_warn("can't alloc struct gfs2_sbd\n");
1053 return -ENOMEM;
1054 }
1055 sdp->sd_args = *args;
1056
1057 if (sdp->sd_args.ar_spectator) {
1058 sb->s_flags |= SB_RDONLY;
1059 set_bit(SDF_RORECOVERY, &sdp->sd_flags);
1060 }
1061 if (sdp->sd_args.ar_posix_acl)
1062 sb->s_flags |= SB_POSIXACL;
1063 if (sdp->sd_args.ar_nobarrier)
1064 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1065
1066 sb->s_flags |= SB_NOSEC;
1067 sb->s_magic = GFS2_MAGIC;
1068 sb->s_op = &gfs2_super_ops;
1069 sb->s_d_op = &gfs2_dops;
1070 sb->s_export_op = &gfs2_export_ops;
1071 sb->s_xattr = gfs2_xattr_handlers;
1072 sb->s_qcop = &gfs2_quotactl_ops;
1073 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1074 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
1075 sb->s_time_gran = 1;
1076 sb->s_maxbytes = MAX_LFS_FILESIZE;
1077
1078 /* Set up the buffer cache and fill in some fake block size values
1079 to allow us to read-in the on-disk superblock. */
1080 sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
1081 sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
1082 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
1083 GFS2_BASIC_BLOCK_SHIFT;
1084 sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift);
1085
1086 sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit;
1087 sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum;
1088 if (sdp->sd_args.ar_statfs_quantum) {
1089 sdp->sd_tune.gt_statfs_slow = 0;
1090 sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum;
1091 } else {
1092 sdp->sd_tune.gt_statfs_slow = 1;
1093 sdp->sd_tune.gt_statfs_quantum = 30;
1094 }
1095
1096 error = init_names(sdp, silent);
1097 if (error) {
1098 /* In this case, we haven't initialized sysfs, so we have to
1099 manually free the sdp. */
1100 free_sbd(sdp);
1101 sb->s_fs_info = NULL;
1102 return error;
1103 }
1104
1105 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s", sdp->sd_table_name);
1106
1107 error = gfs2_sys_fs_add(sdp);
1108 /*
1109 * If we hit an error here, gfs2_sys_fs_add will have called function
1110 * kobject_put which causes the sysfs usage count to go to zero, which
1111 * causes sysfs to call function gfs2_sbd_release, which frees sdp.
1112 * Subsequent error paths here will call gfs2_sys_fs_del, which also
1113 * kobject_put to free sdp.
1114 */
1115 if (error)
1116 return error;
1117
1118 gfs2_create_debugfs_file(sdp);
1119
1120 error = gfs2_lm_mount(sdp, silent);
1121 if (error)
1122 goto fail_debug;
1123
1124 error = init_locking(sdp, &mount_gh, DO);
1125 if (error)
1126 goto fail_lm;
1127
1128 error = init_sb(sdp, silent);
1129 if (error)
1130 goto fail_locking;
1131
1132 error = wait_on_journal(sdp);
1133 if (error)
1134 goto fail_sb;
1135
1136 /*
1137 * If user space has failed to join the cluster or some similar
1138 * failure has occurred, then the journal id will contain a
1139 * negative (error) number. This will then be returned to the
1140 * caller (of the mount syscall). We do this even for spectator
1141 * mounts (which just write a jid of 0 to indicate "ok" even though
1142 * the jid is unused in the spectator case)
1143 */
1144 if (sdp->sd_lockstruct.ls_jid < 0) {
1145 error = sdp->sd_lockstruct.ls_jid;
1146 sdp->sd_lockstruct.ls_jid = 0;
1147 goto fail_sb;
1148 }
1149
1150 if (sdp->sd_args.ar_spectator)
1151 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.s",
1152 sdp->sd_table_name);
1153 else
1154 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.%u",
1155 sdp->sd_table_name, sdp->sd_lockstruct.ls_jid);
1156
1157 error = init_inodes(sdp, DO);
1158 if (error)
1159 goto fail_sb;
1160
1161 error = init_per_node(sdp, DO);
1162 if (error)
1163 goto fail_inodes;
1164
1165 error = gfs2_statfs_init(sdp);
1166 if (error) {
1167 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
1168 goto fail_per_node;
1169 }
1170
1171 if (!sb_rdonly(sb)) {
1172 error = gfs2_make_fs_rw(sdp);
1173 if (error) {
1174 fs_err(sdp, "can't make FS RW: %d\n", error);
1175 goto fail_per_node;
1176 }
1177 }
1178
1179 gfs2_glock_dq_uninit(&mount_gh);
1180 gfs2_online_uevent(sdp);
1181 return 0;
1182
1183 fail_per_node:
1184 init_per_node(sdp, UNDO);
1185 fail_inodes:
1186 init_inodes(sdp, UNDO);
1187 fail_sb:
1188 if (sdp->sd_root_dir)
1189 dput(sdp->sd_root_dir);
1190 if (sdp->sd_master_dir)
1191 dput(sdp->sd_master_dir);
1192 if (sb->s_root)
1193 dput(sb->s_root);
1194 sb->s_root = NULL;
1195 fail_locking:
1196 init_locking(sdp, &mount_gh, UNDO);
1197 fail_lm:
1198 complete_all(&sdp->sd_journal_ready);
1199 gfs2_gl_hash_clear(sdp);
1200 gfs2_lm_unmount(sdp);
1201 fail_debug:
1202 gfs2_delete_debugfs_file(sdp);
1203 /* gfs2_sys_fs_del must be the last thing we do, since it causes
1204 * sysfs to call function gfs2_sbd_release, which frees sdp. */
1205 gfs2_sys_fs_del(sdp);
1206 sb->s_fs_info = NULL;
1207 return error;
1208 }
1209
1210 /**
1211 * gfs2_get_tree - Get the GFS2 superblock and root directory
1212 * @fc: The filesystem context
1213 *
1214 * Returns: 0 or -errno on error
1215 */
gfs2_get_tree(struct fs_context * fc)1216 static int gfs2_get_tree(struct fs_context *fc)
1217 {
1218 struct gfs2_args *args = fc->fs_private;
1219 struct gfs2_sbd *sdp;
1220 int error;
1221
1222 error = get_tree_bdev(fc, gfs2_fill_super);
1223 if (error)
1224 return error;
1225
1226 sdp = fc->root->d_sb->s_fs_info;
1227 dput(fc->root);
1228 if (args->ar_meta)
1229 fc->root = dget(sdp->sd_master_dir);
1230 else
1231 fc->root = dget(sdp->sd_root_dir);
1232 return 0;
1233 }
1234
gfs2_fc_free(struct fs_context * fc)1235 static void gfs2_fc_free(struct fs_context *fc)
1236 {
1237 struct gfs2_args *args = fc->fs_private;
1238
1239 kfree(args);
1240 }
1241
1242 enum gfs2_param {
1243 Opt_lockproto,
1244 Opt_locktable,
1245 Opt_hostdata,
1246 Opt_spectator,
1247 Opt_ignore_local_fs,
1248 Opt_localflocks,
1249 Opt_localcaching,
1250 Opt_debug,
1251 Opt_upgrade,
1252 Opt_acl,
1253 Opt_quota,
1254 Opt_suiddir,
1255 Opt_data,
1256 Opt_meta,
1257 Opt_discard,
1258 Opt_commit,
1259 Opt_errors,
1260 Opt_statfs_quantum,
1261 Opt_statfs_percent,
1262 Opt_quota_quantum,
1263 Opt_barrier,
1264 Opt_rgrplvb,
1265 Opt_loccookie,
1266 };
1267
1268 enum opt_quota {
1269 Opt_quota_unset = 0,
1270 Opt_quota_off,
1271 Opt_quota_account,
1272 Opt_quota_on,
1273 };
1274
1275 static const unsigned int opt_quota_values[] = {
1276 [Opt_quota_off] = GFS2_QUOTA_OFF,
1277 [Opt_quota_account] = GFS2_QUOTA_ACCOUNT,
1278 [Opt_quota_on] = GFS2_QUOTA_ON,
1279 };
1280
1281 enum opt_data {
1282 Opt_data_writeback = GFS2_DATA_WRITEBACK,
1283 Opt_data_ordered = GFS2_DATA_ORDERED,
1284 };
1285
1286 enum opt_errors {
1287 Opt_errors_withdraw = GFS2_ERRORS_WITHDRAW,
1288 Opt_errors_panic = GFS2_ERRORS_PANIC,
1289 };
1290
1291 static const struct fs_parameter_spec gfs2_param_specs[] = {
1292 fsparam_string ("lockproto", Opt_lockproto),
1293 fsparam_string ("locktable", Opt_locktable),
1294 fsparam_string ("hostdata", Opt_hostdata),
1295 fsparam_flag ("spectator", Opt_spectator),
1296 fsparam_flag ("norecovery", Opt_spectator),
1297 fsparam_flag ("ignore_local_fs", Opt_ignore_local_fs),
1298 fsparam_flag ("localflocks", Opt_localflocks),
1299 fsparam_flag ("localcaching", Opt_localcaching),
1300 fsparam_flag_no("debug", Opt_debug),
1301 fsparam_flag ("upgrade", Opt_upgrade),
1302 fsparam_flag_no("acl", Opt_acl),
1303 fsparam_flag_no("suiddir", Opt_suiddir),
1304 fsparam_enum ("data", Opt_data),
1305 fsparam_flag ("meta", Opt_meta),
1306 fsparam_flag_no("discard", Opt_discard),
1307 fsparam_s32 ("commit", Opt_commit),
1308 fsparam_enum ("errors", Opt_errors),
1309 fsparam_s32 ("statfs_quantum", Opt_statfs_quantum),
1310 fsparam_s32 ("statfs_percent", Opt_statfs_percent),
1311 fsparam_s32 ("quota_quantum", Opt_quota_quantum),
1312 fsparam_flag_no("barrier", Opt_barrier),
1313 fsparam_flag_no("rgrplvb", Opt_rgrplvb),
1314 fsparam_flag_no("loccookie", Opt_loccookie),
1315 /* quota can be a flag or an enum so it gets special treatment */
1316 __fsparam(fs_param_is_enum, "quota", Opt_quota, fs_param_neg_with_no|fs_param_v_optional),
1317 {}
1318 };
1319
1320 static const struct fs_parameter_enum gfs2_param_enums[] = {
1321 { Opt_quota, "off", Opt_quota_off },
1322 { Opt_quota, "account", Opt_quota_account },
1323 { Opt_quota, "on", Opt_quota_on },
1324 { Opt_data, "writeback", Opt_data_writeback },
1325 { Opt_data, "ordered", Opt_data_ordered },
1326 { Opt_errors, "withdraw", Opt_errors_withdraw },
1327 { Opt_errors, "panic", Opt_errors_panic },
1328 {}
1329 };
1330
1331 const struct fs_parameter_description gfs2_fs_parameters = {
1332 .name = "gfs2",
1333 .specs = gfs2_param_specs,
1334 .enums = gfs2_param_enums,
1335 };
1336
1337 /* Parse a single mount parameter */
gfs2_parse_param(struct fs_context * fc,struct fs_parameter * param)1338 static int gfs2_parse_param(struct fs_context *fc, struct fs_parameter *param)
1339 {
1340 struct gfs2_args *args = fc->fs_private;
1341 struct fs_parse_result result;
1342 int o;
1343
1344 o = fs_parse(fc, &gfs2_fs_parameters, param, &result);
1345 if (o < 0)
1346 return o;
1347
1348 switch (o) {
1349 case Opt_lockproto:
1350 strlcpy(args->ar_lockproto, param->string, GFS2_LOCKNAME_LEN);
1351 break;
1352 case Opt_locktable:
1353 strlcpy(args->ar_locktable, param->string, GFS2_LOCKNAME_LEN);
1354 break;
1355 case Opt_hostdata:
1356 strlcpy(args->ar_hostdata, param->string, GFS2_LOCKNAME_LEN);
1357 break;
1358 case Opt_spectator:
1359 args->ar_spectator = 1;
1360 break;
1361 case Opt_ignore_local_fs:
1362 /* Retained for backwards compat only */
1363 break;
1364 case Opt_localflocks:
1365 args->ar_localflocks = 1;
1366 break;
1367 case Opt_localcaching:
1368 /* Retained for backwards compat only */
1369 break;
1370 case Opt_debug:
1371 if (result.boolean && args->ar_errors == GFS2_ERRORS_PANIC)
1372 return invalf(fc, "gfs2: -o debug and -o errors=panic are mutually exclusive");
1373 args->ar_debug = result.boolean;
1374 break;
1375 case Opt_upgrade:
1376 /* Retained for backwards compat only */
1377 break;
1378 case Opt_acl:
1379 args->ar_posix_acl = result.boolean;
1380 break;
1381 case Opt_quota:
1382 /* The quota option can be a flag or an enum. A non-zero int_32
1383 result means that we have an enum index. Otherwise we have
1384 to rely on the 'negated' flag to tell us whether 'quota' or
1385 'noquota' was specified. */
1386 if (result.negated)
1387 args->ar_quota = GFS2_QUOTA_OFF;
1388 else if (result.int_32 > 0)
1389 args->ar_quota = opt_quota_values[result.int_32];
1390 else
1391 args->ar_quota = GFS2_QUOTA_ON;
1392 break;
1393 case Opt_suiddir:
1394 args->ar_suiddir = result.boolean;
1395 break;
1396 case Opt_data:
1397 /* The uint_32 result maps directly to GFS2_DATA_* */
1398 args->ar_data = result.uint_32;
1399 break;
1400 case Opt_meta:
1401 args->ar_meta = 1;
1402 break;
1403 case Opt_discard:
1404 args->ar_discard = result.boolean;
1405 break;
1406 case Opt_commit:
1407 if (result.int_32 <= 0)
1408 return invalf(fc, "gfs2: commit mount option requires a positive numeric argument");
1409 args->ar_commit = result.int_32;
1410 break;
1411 case Opt_statfs_quantum:
1412 if (result.int_32 < 0)
1413 return invalf(fc, "gfs2: statfs_quantum mount option requires a non-negative numeric argument");
1414 args->ar_statfs_quantum = result.int_32;
1415 break;
1416 case Opt_quota_quantum:
1417 if (result.int_32 <= 0)
1418 return invalf(fc, "gfs2: quota_quantum mount option requires a positive numeric argument");
1419 args->ar_quota_quantum = result.int_32;
1420 break;
1421 case Opt_statfs_percent:
1422 if (result.int_32 < 0 || result.int_32 > 100)
1423 return invalf(fc, "gfs2: statfs_percent mount option requires a numeric argument between 0 and 100");
1424 args->ar_statfs_percent = result.int_32;
1425 break;
1426 case Opt_errors:
1427 if (args->ar_debug && result.uint_32 == GFS2_ERRORS_PANIC)
1428 return invalf(fc, "gfs2: -o debug and -o errors=panic are mutually exclusive");
1429 args->ar_errors = result.uint_32;
1430 break;
1431 case Opt_barrier:
1432 args->ar_nobarrier = result.boolean;
1433 break;
1434 case Opt_rgrplvb:
1435 args->ar_rgrplvb = result.boolean;
1436 break;
1437 case Opt_loccookie:
1438 args->ar_loccookie = result.boolean;
1439 break;
1440 default:
1441 return invalf(fc, "gfs2: invalid mount option: %s", param->key);
1442 }
1443 return 0;
1444 }
1445
gfs2_reconfigure(struct fs_context * fc)1446 static int gfs2_reconfigure(struct fs_context *fc)
1447 {
1448 struct super_block *sb = fc->root->d_sb;
1449 struct gfs2_sbd *sdp = sb->s_fs_info;
1450 struct gfs2_args *oldargs = &sdp->sd_args;
1451 struct gfs2_args *newargs = fc->fs_private;
1452 struct gfs2_tune *gt = &sdp->sd_tune;
1453 int error = 0;
1454
1455 sync_filesystem(sb);
1456
1457 spin_lock(>->gt_spin);
1458 oldargs->ar_commit = gt->gt_logd_secs;
1459 oldargs->ar_quota_quantum = gt->gt_quota_quantum;
1460 if (gt->gt_statfs_slow)
1461 oldargs->ar_statfs_quantum = 0;
1462 else
1463 oldargs->ar_statfs_quantum = gt->gt_statfs_quantum;
1464 spin_unlock(>->gt_spin);
1465
1466 if (strcmp(newargs->ar_lockproto, oldargs->ar_lockproto)) {
1467 errorf(fc, "gfs2: reconfiguration of locking protocol not allowed");
1468 return -EINVAL;
1469 }
1470 if (strcmp(newargs->ar_locktable, oldargs->ar_locktable)) {
1471 errorf(fc, "gfs2: reconfiguration of lock table not allowed");
1472 return -EINVAL;
1473 }
1474 if (strcmp(newargs->ar_hostdata, oldargs->ar_hostdata)) {
1475 errorf(fc, "gfs2: reconfiguration of host data not allowed");
1476 return -EINVAL;
1477 }
1478 if (newargs->ar_spectator != oldargs->ar_spectator) {
1479 errorf(fc, "gfs2: reconfiguration of spectator mode not allowed");
1480 return -EINVAL;
1481 }
1482 if (newargs->ar_localflocks != oldargs->ar_localflocks) {
1483 errorf(fc, "gfs2: reconfiguration of localflocks not allowed");
1484 return -EINVAL;
1485 }
1486 if (newargs->ar_meta != oldargs->ar_meta) {
1487 errorf(fc, "gfs2: switching between gfs2 and gfs2meta not allowed");
1488 return -EINVAL;
1489 }
1490 if (oldargs->ar_spectator)
1491 fc->sb_flags |= SB_RDONLY;
1492
1493 if ((sb->s_flags ^ fc->sb_flags) & SB_RDONLY) {
1494 if (fc->sb_flags & SB_RDONLY) {
1495 error = gfs2_make_fs_ro(sdp);
1496 if (error)
1497 errorf(fc, "gfs2: unable to remount read-only");
1498 } else {
1499 error = gfs2_make_fs_rw(sdp);
1500 if (error)
1501 errorf(fc, "gfs2: unable to remount read-write");
1502 }
1503 }
1504 sdp->sd_args = *newargs;
1505
1506 if (sdp->sd_args.ar_posix_acl)
1507 sb->s_flags |= SB_POSIXACL;
1508 else
1509 sb->s_flags &= ~SB_POSIXACL;
1510 if (sdp->sd_args.ar_nobarrier)
1511 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1512 else
1513 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1514 spin_lock(>->gt_spin);
1515 gt->gt_logd_secs = newargs->ar_commit;
1516 gt->gt_quota_quantum = newargs->ar_quota_quantum;
1517 if (newargs->ar_statfs_quantum) {
1518 gt->gt_statfs_slow = 0;
1519 gt->gt_statfs_quantum = newargs->ar_statfs_quantum;
1520 }
1521 else {
1522 gt->gt_statfs_slow = 1;
1523 gt->gt_statfs_quantum = 30;
1524 }
1525 spin_unlock(>->gt_spin);
1526
1527 gfs2_online_uevent(sdp);
1528 return error;
1529 }
1530
1531 static const struct fs_context_operations gfs2_context_ops = {
1532 .free = gfs2_fc_free,
1533 .parse_param = gfs2_parse_param,
1534 .get_tree = gfs2_get_tree,
1535 .reconfigure = gfs2_reconfigure,
1536 };
1537
1538 /* Set up the filesystem mount context */
gfs2_init_fs_context(struct fs_context * fc)1539 static int gfs2_init_fs_context(struct fs_context *fc)
1540 {
1541 struct gfs2_args *args;
1542
1543 args = kmalloc(sizeof(*args), GFP_KERNEL);
1544 if (args == NULL)
1545 return -ENOMEM;
1546
1547 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
1548 struct gfs2_sbd *sdp = fc->root->d_sb->s_fs_info;
1549
1550 *args = sdp->sd_args;
1551 } else {
1552 memset(args, 0, sizeof(*args));
1553 args->ar_quota = GFS2_QUOTA_DEFAULT;
1554 args->ar_data = GFS2_DATA_DEFAULT;
1555 args->ar_commit = 30;
1556 args->ar_statfs_quantum = 30;
1557 args->ar_quota_quantum = 60;
1558 args->ar_errors = GFS2_ERRORS_DEFAULT;
1559 }
1560 fc->fs_private = args;
1561 fc->ops = &gfs2_context_ops;
1562 return 0;
1563 }
1564
set_meta_super(struct super_block * s,struct fs_context * fc)1565 static int set_meta_super(struct super_block *s, struct fs_context *fc)
1566 {
1567 return -EINVAL;
1568 }
1569
test_meta_super(struct super_block * s,struct fs_context * fc)1570 static int test_meta_super(struct super_block *s, struct fs_context *fc)
1571 {
1572 return (fc->sget_key == s->s_bdev);
1573 }
1574
gfs2_meta_get_tree(struct fs_context * fc)1575 static int gfs2_meta_get_tree(struct fs_context *fc)
1576 {
1577 struct super_block *s;
1578 struct gfs2_sbd *sdp;
1579 struct path path;
1580 int error;
1581
1582 if (!fc->source || !*fc->source)
1583 return -EINVAL;
1584
1585 error = kern_path(fc->source, LOOKUP_FOLLOW, &path);
1586 if (error) {
1587 pr_warn("path_lookup on %s returned error %d\n",
1588 fc->source, error);
1589 return error;
1590 }
1591 fc->fs_type = &gfs2_fs_type;
1592 fc->sget_key = path.dentry->d_sb->s_bdev;
1593 s = sget_fc(fc, test_meta_super, set_meta_super);
1594 path_put(&path);
1595 if (IS_ERR(s)) {
1596 pr_warn("gfs2 mount does not exist\n");
1597 return PTR_ERR(s);
1598 }
1599 if ((fc->sb_flags ^ s->s_flags) & SB_RDONLY) {
1600 deactivate_locked_super(s);
1601 return -EBUSY;
1602 }
1603 sdp = s->s_fs_info;
1604 fc->root = dget(sdp->sd_master_dir);
1605 return 0;
1606 }
1607
1608 static const struct fs_context_operations gfs2_meta_context_ops = {
1609 .free = gfs2_fc_free,
1610 .get_tree = gfs2_meta_get_tree,
1611 };
1612
gfs2_meta_init_fs_context(struct fs_context * fc)1613 static int gfs2_meta_init_fs_context(struct fs_context *fc)
1614 {
1615 int ret = gfs2_init_fs_context(fc);
1616
1617 if (ret)
1618 return ret;
1619
1620 fc->ops = &gfs2_meta_context_ops;
1621 return 0;
1622 }
1623
gfs2_kill_sb(struct super_block * sb)1624 static void gfs2_kill_sb(struct super_block *sb)
1625 {
1626 struct gfs2_sbd *sdp = sb->s_fs_info;
1627
1628 if (sdp == NULL) {
1629 kill_block_super(sb);
1630 return;
1631 }
1632
1633 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SYNC | GFS2_LFC_KILL_SB);
1634 dput(sdp->sd_root_dir);
1635 dput(sdp->sd_master_dir);
1636 sdp->sd_root_dir = NULL;
1637 sdp->sd_master_dir = NULL;
1638 shrink_dcache_sb(sb);
1639 kill_block_super(sb);
1640 }
1641
1642 struct file_system_type gfs2_fs_type = {
1643 .name = "gfs2",
1644 .fs_flags = FS_REQUIRES_DEV,
1645 .init_fs_context = gfs2_init_fs_context,
1646 .parameters = &gfs2_fs_parameters,
1647 .kill_sb = gfs2_kill_sb,
1648 .owner = THIS_MODULE,
1649 };
1650 MODULE_ALIAS_FS("gfs2");
1651
1652 struct file_system_type gfs2meta_fs_type = {
1653 .name = "gfs2meta",
1654 .fs_flags = FS_REQUIRES_DEV,
1655 .init_fs_context = gfs2_meta_init_fs_context,
1656 .owner = THIS_MODULE,
1657 };
1658 MODULE_ALIAS_FS("gfs2meta");
1659