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Linux 5.8-rc4
[linux/fpc-iii.git] / fs / gfs2 / ops_fstype.c
blob6d18d2c91add2805035de4eebe16d7ae142d16c5
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 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
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
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
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
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
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_ldptrs = (sdp->sd_sb.sb_bsize -
302 sizeof(struct gfs2_log_descriptor)) / sizeof(u64);
303 sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
304 sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
305 sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
306 sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64);
307 sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
308 sizeof(struct gfs2_meta_header)) /
309 sizeof(struct gfs2_quota_change);
310 sdp->sd_blocks_per_bitmap = (sdp->sd_sb.sb_bsize -
311 sizeof(struct gfs2_meta_header))
312 * GFS2_NBBY; /* not the rgrp bitmap, subsequent bitmaps only */
313
314 /* Compute maximum reservation required to add a entry to a directory */
315
316 hash_blocks = DIV_ROUND_UP(sizeof(u64) * BIT(GFS2_DIR_MAX_DEPTH),
317 sdp->sd_jbsize);
318
319 ind_blocks = 0;
320 for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
321 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
322 ind_blocks += tmp_blocks;
323 }
324
325 leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
326
327 sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
328
329 sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
330 sizeof(struct gfs2_dinode);
331 sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
332 for (x = 2;; x++) {
333 u64 space, d;
334 u32 m;
335
336 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
337 d = space;
338 m = do_div(d, sdp->sd_inptrs);
339
340 if (d != sdp->sd_heightsize[x - 1] || m)
341 break;
342 sdp->sd_heightsize[x] = space;
343 }
344 sdp->sd_max_height = x;
345 sdp->sd_heightsize[x] = ~0;
346 gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
347
348 sdp->sd_max_dents_per_leaf = (sdp->sd_sb.sb_bsize -
349 sizeof(struct gfs2_leaf)) /
350 GFS2_MIN_DIRENT_SIZE;
351 return 0;
352 }
353
354 static int init_names(struct gfs2_sbd *sdp, int silent)
355 {
356 char *proto, *table;
357 int error = 0;
358
359 proto = sdp->sd_args.ar_lockproto;
360 table = sdp->sd_args.ar_locktable;
361
362 /* Try to autodetect */
363
364 if (!proto[0] || !table[0]) {
365 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
366 if (error)
367 return error;
368
369 if (!proto[0])
370 proto = sdp->sd_sb.sb_lockproto;
371 if (!table[0])
372 table = sdp->sd_sb.sb_locktable;
373 }
374
375 if (!table[0])
376 table = sdp->sd_vfs->s_id;
377
378 strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN);
379 strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN);
380
381 table = sdp->sd_table_name;
382 while ((table = strchr(table, '/')))
383 *table = '_';
384
385 return error;
386 }
387
388 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
389 int undo)
390 {
391 int error = 0;
392
393 if (undo)
394 goto fail_trans;
395
396 error = gfs2_glock_nq_num(sdp,
397 GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
398 LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
399 mount_gh);
400 if (error) {
401 fs_err(sdp, "can't acquire mount glock: %d\n", error);
402 goto fail;
403 }
404
405 error = gfs2_glock_nq_num(sdp,
406 GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
407 LM_ST_SHARED,
408 LM_FLAG_NOEXP | GL_EXACT,
409 &sdp->sd_live_gh);
410 if (error) {
411 fs_err(sdp, "can't acquire live glock: %d\n", error);
412 goto fail_mount;
413 }
414
415 error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
416 CREATE, &sdp->sd_rename_gl);
417 if (error) {
418 fs_err(sdp, "can't create rename glock: %d\n", error);
419 goto fail_live;
420 }
421
422 error = gfs2_glock_get(sdp, GFS2_FREEZE_LOCK, &gfs2_freeze_glops,
423 CREATE, &sdp->sd_freeze_gl);
424 if (error) {
425 fs_err(sdp, "can't create transaction glock: %d\n", error);
426 goto fail_rename;
427 }
428
429 return 0;
430
431 fail_trans:
432 gfs2_glock_put(sdp->sd_freeze_gl);
433 fail_rename:
434 gfs2_glock_put(sdp->sd_rename_gl);
435 fail_live:
436 gfs2_glock_dq_uninit(&sdp->sd_live_gh);
437 fail_mount:
438 gfs2_glock_dq_uninit(mount_gh);
439 fail:
440 return error;
441 }
442
443 static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr,
444 u64 no_addr, const char *name)
445 {
446 struct gfs2_sbd *sdp = sb->s_fs_info;
447 struct dentry *dentry;
448 struct inode *inode;
449
450 inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0,
451 GFS2_BLKST_FREE /* ignore */);
452 if (IS_ERR(inode)) {
453 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode));
454 return PTR_ERR(inode);
455 }
456 dentry = d_make_root(inode);
457 if (!dentry) {
458 fs_err(sdp, "can't alloc %s dentry\n", name);
459 return -ENOMEM;
460 }
461 *dptr = dentry;
462 return 0;
463 }
464
465 static int init_sb(struct gfs2_sbd *sdp, int silent)
466 {
467 struct super_block *sb = sdp->sd_vfs;
468 struct gfs2_holder sb_gh;
469 u64 no_addr;
470 int ret;
471
472 ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
473 LM_ST_SHARED, 0, &sb_gh);
474 if (ret) {
475 fs_err(sdp, "can't acquire superblock glock: %d\n", ret);
476 return ret;
477 }
478
479 ret = gfs2_read_sb(sdp, silent);
480 if (ret) {
481 fs_err(sdp, "can't read superblock: %d\n", ret);
482 goto out;
483 }
484
485 /* Set up the buffer cache and SB for real */
486 if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) {
487 ret = -EINVAL;
488 fs_err(sdp, "FS block size (%u) is too small for device "
489 "block size (%u)\n",
490 sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev));
491 goto out;
492 }
493 if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
494 ret = -EINVAL;
495 fs_err(sdp, "FS block size (%u) is too big for machine "
496 "page size (%u)\n",
497 sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
498 goto out;
499 }
500 sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
501
502 /* Get the root inode */
503 no_addr = sdp->sd_sb.sb_root_dir.no_addr;
504 ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root");
505 if (ret)
506 goto out;
507
508 /* Get the master inode */
509 no_addr = sdp->sd_sb.sb_master_dir.no_addr;
510 ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master");
511 if (ret) {
512 dput(sdp->sd_root_dir);
513 goto out;
514 }
515 sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir);
516 out:
517 gfs2_glock_dq_uninit(&sb_gh);
518 return ret;
519 }
520
521 static void gfs2_others_may_mount(struct gfs2_sbd *sdp)
522 {
523 char *message = "FIRSTMOUNT=Done";
524 char *envp[] = { message, NULL };
525
526 fs_info(sdp, "first mount done, others may mount\n");
527
528 if (sdp->sd_lockstruct.ls_ops->lm_first_done)
529 sdp->sd_lockstruct.ls_ops->lm_first_done(sdp);
530
531 kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp);
532 }
533
534 /**
535 * gfs2_jindex_hold - Grab a lock on the jindex
536 * @sdp: The GFS2 superblock
537 * @ji_gh: the holder for the jindex glock
538 *
539 * Returns: errno
540 */
541
542 static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
543 {
544 struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex);
545 struct qstr name;
546 char buf[20];
547 struct gfs2_jdesc *jd;
548 int error;
549
550 name.name = buf;
551
552 mutex_lock(&sdp->sd_jindex_mutex);
553
554 for (;;) {
555 struct gfs2_inode *jip;
556
557 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh);
558 if (error)
559 break;
560
561 name.len = sprintf(buf, "journal%u", sdp->sd_journals);
562 name.hash = gfs2_disk_hash(name.name, name.len);
563
564 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL);
565 if (error == -ENOENT) {
566 error = 0;
567 break;
568 }
569
570 gfs2_glock_dq_uninit(ji_gh);
571
572 if (error)
573 break;
574
575 error = -ENOMEM;
576 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
577 if (!jd)
578 break;
579
580 INIT_LIST_HEAD(&jd->extent_list);
581 INIT_LIST_HEAD(&jd->jd_revoke_list);
582
583 INIT_WORK(&jd->jd_work, gfs2_recover_func);
584 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1);
585 if (IS_ERR_OR_NULL(jd->jd_inode)) {
586 if (!jd->jd_inode)
587 error = -ENOENT;
588 else
589 error = PTR_ERR(jd->jd_inode);
590 kfree(jd);
591 break;
592 }
593
594 spin_lock(&sdp->sd_jindex_spin);
595 jd->jd_jid = sdp->sd_journals++;
596 jip = GFS2_I(jd->jd_inode);
597 jd->jd_no_addr = jip->i_no_addr;
598 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
599 spin_unlock(&sdp->sd_jindex_spin);
600 }
601
602 mutex_unlock(&sdp->sd_jindex_mutex);
603
604 return error;
605 }
606
607 static int init_journal(struct gfs2_sbd *sdp, int undo)
608 {
609 struct inode *master = d_inode(sdp->sd_master_dir);
610 struct gfs2_holder ji_gh;
611 struct gfs2_inode *ip;
612 int jindex = 1;
613 int error = 0;
614
615 if (undo) {
616 jindex = 0;
617 goto fail_jinode_gh;
618 }
619
620 sdp->sd_jindex = gfs2_lookup_simple(master, "jindex");
621 if (IS_ERR(sdp->sd_jindex)) {
622 fs_err(sdp, "can't lookup journal index: %d\n", error);
623 return PTR_ERR(sdp->sd_jindex);
624 }
625
626 /* Load in the journal index special file */
627
628 error = gfs2_jindex_hold(sdp, &ji_gh);
629 if (error) {
630 fs_err(sdp, "can't read journal index: %d\n", error);
631 goto fail;
632 }
633
634 error = -EUSERS;
635 if (!gfs2_jindex_size(sdp)) {
636 fs_err(sdp, "no journals!\n");
637 goto fail_jindex;
638 }
639
640 atomic_set(&sdp->sd_log_blks_needed, 0);
641 if (sdp->sd_args.ar_spectator) {
642 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
643 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
644 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
645 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
646 } else {
647 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
648 fs_err(sdp, "can't mount journal #%u\n",
649 sdp->sd_lockstruct.ls_jid);
650 fs_err(sdp, "there are only %u journals (0 - %u)\n",
651 gfs2_jindex_size(sdp),
652 gfs2_jindex_size(sdp) - 1);
653 goto fail_jindex;
654 }
655 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
656
657 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
658 &gfs2_journal_glops,
659 LM_ST_EXCLUSIVE,
660 LM_FLAG_NOEXP | GL_NOCACHE,
661 &sdp->sd_journal_gh);
662 if (error) {
663 fs_err(sdp, "can't acquire journal glock: %d\n", error);
664 goto fail_jindex;
665 }
666
667 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
668 sdp->sd_jinode_gl = ip->i_gl;
669 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
670 LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE,
671 &sdp->sd_jinode_gh);
672 if (error) {
673 fs_err(sdp, "can't acquire journal inode glock: %d\n",
674 error);
675 goto fail_journal_gh;
676 }
677
678 error = gfs2_jdesc_check(sdp->sd_jdesc);
679 if (error) {
680 fs_err(sdp, "my journal (%u) is bad: %d\n",
681 sdp->sd_jdesc->jd_jid, error);
682 goto fail_jinode_gh;
683 }
684 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
685 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
686 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
687
688 /* Map the extents for this journal's blocks */
689 gfs2_map_journal_extents(sdp, sdp->sd_jdesc);
690 }
691 trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free));
692
693 if (sdp->sd_lockstruct.ls_first) {
694 unsigned int x;
695 for (x = 0; x < sdp->sd_journals; x++) {
696 struct gfs2_jdesc *jd = gfs2_jdesc_find(sdp, x);
697
698 if (sdp->sd_args.ar_spectator) {
699 error = check_journal_clean(sdp, jd, true);
700 if (error)
701 goto fail_jinode_gh;
702 continue;
703 }
704 error = gfs2_recover_journal(jd, true);
705 if (error) {
706 fs_err(sdp, "error recovering journal %u: %d\n",
707 x, error);
708 goto fail_jinode_gh;
709 }
710 }
711
712 gfs2_others_may_mount(sdp);
713 } else if (!sdp->sd_args.ar_spectator) {
714 error = gfs2_recover_journal(sdp->sd_jdesc, true);
715 if (error) {
716 fs_err(sdp, "error recovering my journal: %d\n", error);
717 goto fail_jinode_gh;
718 }
719 }
720
721 sdp->sd_log_idle = 1;
722 set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
723 gfs2_glock_dq_uninit(&ji_gh);
724 jindex = 0;
725 INIT_WORK(&sdp->sd_freeze_work, gfs2_freeze_func);
726 return 0;
727
728 fail_jinode_gh:
729 /* A withdraw may have done dq/uninit so now we need to check it */
730 if (!sdp->sd_args.ar_spectator &&
731 gfs2_holder_initialized(&sdp->sd_jinode_gh))
732 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
733 fail_journal_gh:
734 if (!sdp->sd_args.ar_spectator &&
735 gfs2_holder_initialized(&sdp->sd_journal_gh))
736 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
737 fail_jindex:
738 gfs2_jindex_free(sdp);
739 if (jindex)
740 gfs2_glock_dq_uninit(&ji_gh);
741 fail:
742 iput(sdp->sd_jindex);
743 return error;
744 }
745
746 static struct lock_class_key gfs2_quota_imutex_key;
747
748 static int init_inodes(struct gfs2_sbd *sdp, int undo)
749 {
750 int error = 0;
751 struct inode *master = d_inode(sdp->sd_master_dir);
752
753 if (undo)
754 goto fail_qinode;
755
756 error = init_journal(sdp, undo);
757 complete_all(&sdp->sd_journal_ready);
758 if (error)
759 goto fail;
760
761 /* Read in the master statfs inode */
762 sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs");
763 if (IS_ERR(sdp->sd_statfs_inode)) {
764 error = PTR_ERR(sdp->sd_statfs_inode);
765 fs_err(sdp, "can't read in statfs inode: %d\n", error);
766 goto fail_journal;
767 }
768
769 /* Read in the resource index inode */
770 sdp->sd_rindex = gfs2_lookup_simple(master, "rindex");
771 if (IS_ERR(sdp->sd_rindex)) {
772 error = PTR_ERR(sdp->sd_rindex);
773 fs_err(sdp, "can't get resource index inode: %d\n", error);
774 goto fail_statfs;
775 }
776 sdp->sd_rindex_uptodate = 0;
777
778 /* Read in the quota inode */
779 sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota");
780 if (IS_ERR(sdp->sd_quota_inode)) {
781 error = PTR_ERR(sdp->sd_quota_inode);
782 fs_err(sdp, "can't get quota file inode: %d\n", error);
783 goto fail_rindex;
784 }
785 /*
786 * i_rwsem on quota files is special. Since this inode is hidden system
787 * file, we are safe to define locking ourselves.
788 */
789 lockdep_set_class(&sdp->sd_quota_inode->i_rwsem,
790 &gfs2_quota_imutex_key);
791
792 error = gfs2_rindex_update(sdp);
793 if (error)
794 goto fail_qinode;
795
796 return 0;
797
798 fail_qinode:
799 iput(sdp->sd_quota_inode);
800 fail_rindex:
801 gfs2_clear_rgrpd(sdp);
802 iput(sdp->sd_rindex);
803 fail_statfs:
804 iput(sdp->sd_statfs_inode);
805 fail_journal:
806 init_journal(sdp, UNDO);
807 fail:
808 return error;
809 }
810
811 static int init_per_node(struct gfs2_sbd *sdp, int undo)
812 {
813 struct inode *pn = NULL;
814 char buf[30];
815 int error = 0;
816 struct gfs2_inode *ip;
817 struct inode *master = d_inode(sdp->sd_master_dir);
818
819 if (sdp->sd_args.ar_spectator)
820 return 0;
821
822 if (undo)
823 goto fail_qc_gh;
824
825 pn = gfs2_lookup_simple(master, "per_node");
826 if (IS_ERR(pn)) {
827 error = PTR_ERR(pn);
828 fs_err(sdp, "can't find per_node directory: %d\n", error);
829 return error;
830 }
831
832 sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid);
833 sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf);
834 if (IS_ERR(sdp->sd_sc_inode)) {
835 error = PTR_ERR(sdp->sd_sc_inode);
836 fs_err(sdp, "can't find local \"sc\" file: %d\n", error);
837 goto fail;
838 }
839
840 sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
841 sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
842 if (IS_ERR(sdp->sd_qc_inode)) {
843 error = PTR_ERR(sdp->sd_qc_inode);
844 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
845 goto fail_ut_i;
846 }
847
848 iput(pn);
849 pn = NULL;
850
851 ip = GFS2_I(sdp->sd_sc_inode);
852 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
853 &sdp->sd_sc_gh);
854 if (error) {
855 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
856 goto fail_qc_i;
857 }
858
859 ip = GFS2_I(sdp->sd_qc_inode);
860 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
861 &sdp->sd_qc_gh);
862 if (error) {
863 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
864 goto fail_ut_gh;
865 }
866
867 return 0;
868
869 fail_qc_gh:
870 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
871 fail_ut_gh:
872 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
873 fail_qc_i:
874 iput(sdp->sd_qc_inode);
875 fail_ut_i:
876 iput(sdp->sd_sc_inode);
877 fail:
878 iput(pn);
879 return error;
880 }
881
882 static const match_table_t nolock_tokens = {
883 { Opt_jid, "jid=%d", },
884 { Opt_err, NULL },
885 };
886
887 static const struct lm_lockops nolock_ops = {
888 .lm_proto_name = "lock_nolock",
889 .lm_put_lock = gfs2_glock_free,
890 .lm_tokens = &nolock_tokens,
891 };
892
893 /**
894 * gfs2_lm_mount - mount a locking protocol
895 * @sdp: the filesystem
896 * @args: mount arguments
897 * @silent: if 1, don't complain if the FS isn't a GFS2 fs
898 *
899 * Returns: errno
900 */
901
902 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
903 {
904 const struct lm_lockops *lm;
905 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
906 struct gfs2_args *args = &sdp->sd_args;
907 const char *proto = sdp->sd_proto_name;
908 const char *table = sdp->sd_table_name;
909 char *o, *options;
910 int ret;
911
912 if (!strcmp("lock_nolock", proto)) {
913 lm = &nolock_ops;
914 sdp->sd_args.ar_localflocks = 1;
915 #ifdef CONFIG_GFS2_FS_LOCKING_DLM
916 } else if (!strcmp("lock_dlm", proto)) {
917 lm = &gfs2_dlm_ops;
918 #endif
919 } else {
920 pr_info("can't find protocol %s\n", proto);
921 return -ENOENT;
922 }
923
924 fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);
925
926 ls->ls_ops = lm;
927 ls->ls_first = 1;
928
929 for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) {
930 substring_t tmp[MAX_OPT_ARGS];
931 int token, option;
932
933 if (!o || !*o)
934 continue;
935
936 token = match_token(o, *lm->lm_tokens, tmp);
937 switch (token) {
938 case Opt_jid:
939 ret = match_int(&tmp[0], &option);
940 if (ret || option < 0)
941 goto hostdata_error;
942 if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags))
943 ls->ls_jid = option;
944 break;
945 case Opt_id:
946 case Opt_nodir:
947 /* Obsolete, but left for backward compat purposes */
948 break;
949 case Opt_first:
950 ret = match_int(&tmp[0], &option);
951 if (ret || (option != 0 && option != 1))
952 goto hostdata_error;
953 ls->ls_first = option;
954 break;
955 case Opt_err:
956 default:
957 hostdata_error:
958 fs_info(sdp, "unknown hostdata (%s)\n", o);
959 return -EINVAL;
960 }
961 }
962
963 if (lm->lm_mount == NULL) {
964 fs_info(sdp, "Now mounting FS...\n");
965 complete_all(&sdp->sd_locking_init);
966 return 0;
967 }
968 ret = lm->lm_mount(sdp, table);
969 if (ret == 0)
970 fs_info(sdp, "Joined cluster. Now mounting FS...\n");
971 complete_all(&sdp->sd_locking_init);
972 return ret;
973 }
974
975 void gfs2_lm_unmount(struct gfs2_sbd *sdp)
976 {
977 const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops;
978 if (likely(!gfs2_withdrawn(sdp)) && lm->lm_unmount)
979 lm->lm_unmount(sdp);
980 }
981
982 static int wait_on_journal(struct gfs2_sbd *sdp)
983 {
984 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
985 return 0;
986
987 return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, TASK_INTERRUPTIBLE)
988 ? -EINTR : 0;
989 }
990
991 void gfs2_online_uevent(struct gfs2_sbd *sdp)
992 {
993 struct super_block *sb = sdp->sd_vfs;
994 char ro[20];
995 char spectator[20];
996 char *envp[] = { ro, spectator, NULL };
997 sprintf(ro, "RDONLY=%d", sb_rdonly(sb));
998 sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
999 kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp);
1000 }
1001
1002 /**
1003 * gfs2_fill_super - Read in superblock
1004 * @sb: The VFS superblock
1005 * @args: Mount options
1006 * @silent: Don't complain if it's not a GFS2 filesystem
1007 *
1008 * Returns: -errno
1009 */
1010 static int gfs2_fill_super(struct super_block *sb, struct fs_context *fc)
1011 {
1012 struct gfs2_args *args = fc->fs_private;
1013 int silent = fc->sb_flags & SB_SILENT;
1014 struct gfs2_sbd *sdp;
1015 struct gfs2_holder mount_gh;
1016 int error;
1017
1018 sdp = init_sbd(sb);
1019 if (!sdp) {
1020 pr_warn("can't alloc struct gfs2_sbd\n");
1021 return -ENOMEM;
1022 }
1023 sdp->sd_args = *args;
1024
1025 if (sdp->sd_args.ar_spectator) {
1026 sb->s_flags |= SB_RDONLY;
1027 set_bit(SDF_RORECOVERY, &sdp->sd_flags);
1028 }
1029 if (sdp->sd_args.ar_posix_acl)
1030 sb->s_flags |= SB_POSIXACL;
1031 if (sdp->sd_args.ar_nobarrier)
1032 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1033
1034 sb->s_flags |= SB_NOSEC;
1035 sb->s_magic = GFS2_MAGIC;
1036 sb->s_op = &gfs2_super_ops;
1037 sb->s_d_op = &gfs2_dops;
1038 sb->s_export_op = &gfs2_export_ops;
1039 sb->s_xattr = gfs2_xattr_handlers;
1040 sb->s_qcop = &gfs2_quotactl_ops;
1041 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1042 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
1043 sb->s_time_gran = 1;
1044 sb->s_maxbytes = MAX_LFS_FILESIZE;
1045
1046 /* Set up the buffer cache and fill in some fake block size values
1047 to allow us to read-in the on-disk superblock. */
1048 sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
1049 sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
1050 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
1051 GFS2_BASIC_BLOCK_SHIFT;
1052 sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift);
1053
1054 sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit;
1055 sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum;
1056 if (sdp->sd_args.ar_statfs_quantum) {
1057 sdp->sd_tune.gt_statfs_slow = 0;
1058 sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum;
1059 } else {
1060 sdp->sd_tune.gt_statfs_slow = 1;
1061 sdp->sd_tune.gt_statfs_quantum = 30;
1062 }
1063
1064 error = init_names(sdp, silent);
1065 if (error) {
1066 /* In this case, we haven't initialized sysfs, so we have to
1067 manually free the sdp. */
1068 free_sbd(sdp);
1069 sb->s_fs_info = NULL;
1070 return error;
1071 }
1072
1073 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s", sdp->sd_table_name);
1074
1075 error = gfs2_sys_fs_add(sdp);
1076 /*
1077 * If we hit an error here, gfs2_sys_fs_add will have called function
1078 * kobject_put which causes the sysfs usage count to go to zero, which
1079 * causes sysfs to call function gfs2_sbd_release, which frees sdp.
1080 * Subsequent error paths here will call gfs2_sys_fs_del, which also
1081 * kobject_put to free sdp.
1082 */
1083 if (error)
1084 return error;
1085
1086 gfs2_create_debugfs_file(sdp);
1087
1088 error = gfs2_lm_mount(sdp, silent);
1089 if (error)
1090 goto fail_debug;
1091
1092 error = init_locking(sdp, &mount_gh, DO);
1093 if (error)
1094 goto fail_lm;
1095
1096 error = init_sb(sdp, silent);
1097 if (error)
1098 goto fail_locking;
1099
1100 error = wait_on_journal(sdp);
1101 if (error)
1102 goto fail_sb;
1103
1104 /*
1105 * If user space has failed to join the cluster or some similar
1106 * failure has occurred, then the journal id will contain a
1107 * negative (error) number. This will then be returned to the
1108 * caller (of the mount syscall). We do this even for spectator
1109 * mounts (which just write a jid of 0 to indicate "ok" even though
1110 * the jid is unused in the spectator case)
1111 */
1112 if (sdp->sd_lockstruct.ls_jid < 0) {
1113 error = sdp->sd_lockstruct.ls_jid;
1114 sdp->sd_lockstruct.ls_jid = 0;
1115 goto fail_sb;
1116 }
1117
1118 if (sdp->sd_args.ar_spectator)
1119 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.s",
1120 sdp->sd_table_name);
1121 else
1122 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.%u",
1123 sdp->sd_table_name, sdp->sd_lockstruct.ls_jid);
1124
1125 error = init_inodes(sdp, DO);
1126 if (error)
1127 goto fail_sb;
1128
1129 error = init_per_node(sdp, DO);
1130 if (error)
1131 goto fail_inodes;
1132
1133 error = gfs2_statfs_init(sdp);
1134 if (error) {
1135 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
1136 goto fail_per_node;
1137 }
1138
1139 if (sb_rdonly(sb)) {
1140 struct gfs2_holder freeze_gh;
1141
1142 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED,
1143 LM_FLAG_NOEXP | GL_EXACT,
1144 &freeze_gh);
1145 if (error) {
1146 fs_err(sdp, "can't make FS RO: %d\n", error);
1147 goto fail_per_node;
1148 }
1149 gfs2_glock_dq_uninit(&freeze_gh);
1150 } else {
1151 error = gfs2_make_fs_rw(sdp);
1152 if (error) {
1153 fs_err(sdp, "can't make FS RW: %d\n", error);
1154 goto fail_per_node;
1155 }
1156 }
1157
1158 gfs2_glock_dq_uninit(&mount_gh);
1159 gfs2_online_uevent(sdp);
1160 return 0;
1161
1162 fail_per_node:
1163 init_per_node(sdp, UNDO);
1164 fail_inodes:
1165 init_inodes(sdp, UNDO);
1166 fail_sb:
1167 if (sdp->sd_root_dir)
1168 dput(sdp->sd_root_dir);
1169 if (sdp->sd_master_dir)
1170 dput(sdp->sd_master_dir);
1171 if (sb->s_root)
1172 dput(sb->s_root);
1173 sb->s_root = NULL;
1174 fail_locking:
1175 init_locking(sdp, &mount_gh, UNDO);
1176 fail_lm:
1177 complete_all(&sdp->sd_journal_ready);
1178 gfs2_gl_hash_clear(sdp);
1179 gfs2_lm_unmount(sdp);
1180 fail_debug:
1181 gfs2_delete_debugfs_file(sdp);
1182 /* gfs2_sys_fs_del must be the last thing we do, since it causes
1183 * sysfs to call function gfs2_sbd_release, which frees sdp. */
1184 gfs2_sys_fs_del(sdp);
1185 sb->s_fs_info = NULL;
1186 return error;
1187 }
1188
1189 /**
1190 * gfs2_get_tree - Get the GFS2 superblock and root directory
1191 * @fc: The filesystem context
1192 *
1193 * Returns: 0 or -errno on error
1194 */
1195 static int gfs2_get_tree(struct fs_context *fc)
1196 {
1197 struct gfs2_args *args = fc->fs_private;
1198 struct gfs2_sbd *sdp;
1199 int error;
1200
1201 error = get_tree_bdev(fc, gfs2_fill_super);
1202 if (error)
1203 return error;
1204
1205 sdp = fc->root->d_sb->s_fs_info;
1206 dput(fc->root);
1207 if (args->ar_meta)
1208 fc->root = dget(sdp->sd_master_dir);
1209 else
1210 fc->root = dget(sdp->sd_root_dir);
1211 return 0;
1212 }
1213
1214 static void gfs2_fc_free(struct fs_context *fc)
1215 {
1216 struct gfs2_args *args = fc->fs_private;
1217
1218 kfree(args);
1219 }
1220
1221 enum gfs2_param {
1222 Opt_lockproto,
1223 Opt_locktable,
1224 Opt_hostdata,
1225 Opt_spectator,
1226 Opt_ignore_local_fs,
1227 Opt_localflocks,
1228 Opt_localcaching,
1229 Opt_debug,
1230 Opt_upgrade,
1231 Opt_acl,
1232 Opt_quota,
1233 Opt_quota_flag,
1234 Opt_suiddir,
1235 Opt_data,
1236 Opt_meta,
1237 Opt_discard,
1238 Opt_commit,
1239 Opt_errors,
1240 Opt_statfs_quantum,
1241 Opt_statfs_percent,
1242 Opt_quota_quantum,
1243 Opt_barrier,
1244 Opt_rgrplvb,
1245 Opt_loccookie,
1246 };
1247
1248 static const struct constant_table gfs2_param_quota[] = {
1249 {"off", GFS2_QUOTA_OFF},
1250 {"account", GFS2_QUOTA_ACCOUNT},
1251 {"on", GFS2_QUOTA_ON},
1252 {}
1253 };
1254
1255 enum opt_data {
1256 Opt_data_writeback = GFS2_DATA_WRITEBACK,
1257 Opt_data_ordered = GFS2_DATA_ORDERED,
1258 };
1259
1260 static const struct constant_table gfs2_param_data[] = {
1261 {"writeback", Opt_data_writeback },
1262 {"ordered", Opt_data_ordered },
1263 {}
1264 };
1265
1266 enum opt_errors {
1267 Opt_errors_withdraw = GFS2_ERRORS_WITHDRAW,
1268 Opt_errors_panic = GFS2_ERRORS_PANIC,
1269 };
1270
1271 static const struct constant_table gfs2_param_errors[] = {
1272 {"withdraw", Opt_errors_withdraw },
1273 {"panic", Opt_errors_panic },
1274 {}
1275 };
1276
1277 static const struct fs_parameter_spec gfs2_fs_parameters[] = {
1278 fsparam_string ("lockproto", Opt_lockproto),
1279 fsparam_string ("locktable", Opt_locktable),
1280 fsparam_string ("hostdata", Opt_hostdata),
1281 fsparam_flag ("spectator", Opt_spectator),
1282 fsparam_flag ("norecovery", Opt_spectator),
1283 fsparam_flag ("ignore_local_fs", Opt_ignore_local_fs),
1284 fsparam_flag ("localflocks", Opt_localflocks),
1285 fsparam_flag ("localcaching", Opt_localcaching),
1286 fsparam_flag_no("debug", Opt_debug),
1287 fsparam_flag ("upgrade", Opt_upgrade),
1288 fsparam_flag_no("acl", Opt_acl),
1289 fsparam_flag_no("suiddir", Opt_suiddir),
1290 fsparam_enum ("data", Opt_data, gfs2_param_data),
1291 fsparam_flag ("meta", Opt_meta),
1292 fsparam_flag_no("discard", Opt_discard),
1293 fsparam_s32 ("commit", Opt_commit),
1294 fsparam_enum ("errors", Opt_errors, gfs2_param_errors),
1295 fsparam_s32 ("statfs_quantum", Opt_statfs_quantum),
1296 fsparam_s32 ("statfs_percent", Opt_statfs_percent),
1297 fsparam_s32 ("quota_quantum", Opt_quota_quantum),
1298 fsparam_flag_no("barrier", Opt_barrier),
1299 fsparam_flag_no("rgrplvb", Opt_rgrplvb),
1300 fsparam_flag_no("loccookie", Opt_loccookie),
1301 /* quota can be a flag or an enum so it gets special treatment */
1302 fsparam_flag_no("quota", Opt_quota_flag),
1303 fsparam_enum("quota", Opt_quota, gfs2_param_quota),
1304 {}
1305 };
1306
1307 /* Parse a single mount parameter */
1308 static int gfs2_parse_param(struct fs_context *fc, struct fs_parameter *param)
1309 {
1310 struct gfs2_args *args = fc->fs_private;
1311 struct fs_parse_result result;
1312 int o;
1313
1314 o = fs_parse(fc, gfs2_fs_parameters, param, &result);
1315 if (o < 0)
1316 return o;
1317
1318 switch (o) {
1319 case Opt_lockproto:
1320 strlcpy(args->ar_lockproto, param->string, GFS2_LOCKNAME_LEN);
1321 break;
1322 case Opt_locktable:
1323 strlcpy(args->ar_locktable, param->string, GFS2_LOCKNAME_LEN);
1324 break;
1325 case Opt_hostdata:
1326 strlcpy(args->ar_hostdata, param->string, GFS2_LOCKNAME_LEN);
1327 break;
1328 case Opt_spectator:
1329 args->ar_spectator = 1;
1330 break;
1331 case Opt_ignore_local_fs:
1332 /* Retained for backwards compat only */
1333 break;
1334 case Opt_localflocks:
1335 args->ar_localflocks = 1;
1336 break;
1337 case Opt_localcaching:
1338 /* Retained for backwards compat only */
1339 break;
1340 case Opt_debug:
1341 if (result.boolean && args->ar_errors == GFS2_ERRORS_PANIC)
1342 return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive");
1343 args->ar_debug = result.boolean;
1344 break;
1345 case Opt_upgrade:
1346 /* Retained for backwards compat only */
1347 break;
1348 case Opt_acl:
1349 args->ar_posix_acl = result.boolean;
1350 break;
1351 case Opt_quota_flag:
1352 args->ar_quota = result.negated ? GFS2_QUOTA_OFF : GFS2_QUOTA_ON;
1353 break;
1354 case Opt_quota:
1355 args->ar_quota = result.int_32;
1356 break;
1357 case Opt_suiddir:
1358 args->ar_suiddir = result.boolean;
1359 break;
1360 case Opt_data:
1361 /* The uint_32 result maps directly to GFS2_DATA_* */
1362 args->ar_data = result.uint_32;
1363 break;
1364 case Opt_meta:
1365 args->ar_meta = 1;
1366 break;
1367 case Opt_discard:
1368 args->ar_discard = result.boolean;
1369 break;
1370 case Opt_commit:
1371 if (result.int_32 <= 0)
1372 return invalfc(fc, "commit mount option requires a positive numeric argument");
1373 args->ar_commit = result.int_32;
1374 break;
1375 case Opt_statfs_quantum:
1376 if (result.int_32 < 0)
1377 return invalfc(fc, "statfs_quantum mount option requires a non-negative numeric argument");
1378 args->ar_statfs_quantum = result.int_32;
1379 break;
1380 case Opt_quota_quantum:
1381 if (result.int_32 <= 0)
1382 return invalfc(fc, "quota_quantum mount option requires a positive numeric argument");
1383 args->ar_quota_quantum = result.int_32;
1384 break;
1385 case Opt_statfs_percent:
1386 if (result.int_32 < 0 || result.int_32 > 100)
1387 return invalfc(fc, "statfs_percent mount option requires a numeric argument between 0 and 100");
1388 args->ar_statfs_percent = result.int_32;
1389 break;
1390 case Opt_errors:
1391 if (args->ar_debug && result.uint_32 == GFS2_ERRORS_PANIC)
1392 return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive");
1393 args->ar_errors = result.uint_32;
1394 break;
1395 case Opt_barrier:
1396 args->ar_nobarrier = result.boolean;
1397 break;
1398 case Opt_rgrplvb:
1399 args->ar_rgrplvb = result.boolean;
1400 break;
1401 case Opt_loccookie:
1402 args->ar_loccookie = result.boolean;
1403 break;
1404 default:
1405 return invalfc(fc, "invalid mount option: %s", param->key);
1406 }
1407 return 0;
1408 }
1409
1410 static int gfs2_reconfigure(struct fs_context *fc)
1411 {
1412 struct super_block *sb = fc->root->d_sb;
1413 struct gfs2_sbd *sdp = sb->s_fs_info;
1414 struct gfs2_args *oldargs = &sdp->sd_args;
1415 struct gfs2_args *newargs = fc->fs_private;
1416 struct gfs2_tune *gt = &sdp->sd_tune;
1417 int error = 0;
1418
1419 sync_filesystem(sb);
1420
1421 spin_lock(&gt->gt_spin);
1422 oldargs->ar_commit = gt->gt_logd_secs;
1423 oldargs->ar_quota_quantum = gt->gt_quota_quantum;
1424 if (gt->gt_statfs_slow)
1425 oldargs->ar_statfs_quantum = 0;
1426 else
1427 oldargs->ar_statfs_quantum = gt->gt_statfs_quantum;
1428 spin_unlock(&gt->gt_spin);
1429
1430 if (strcmp(newargs->ar_lockproto, oldargs->ar_lockproto)) {
1431 errorfc(fc, "reconfiguration of locking protocol not allowed");
1432 return -EINVAL;
1433 }
1434 if (strcmp(newargs->ar_locktable, oldargs->ar_locktable)) {
1435 errorfc(fc, "reconfiguration of lock table not allowed");
1436 return -EINVAL;
1437 }
1438 if (strcmp(newargs->ar_hostdata, oldargs->ar_hostdata)) {
1439 errorfc(fc, "reconfiguration of host data not allowed");
1440 return -EINVAL;
1441 }
1442 if (newargs->ar_spectator != oldargs->ar_spectator) {
1443 errorfc(fc, "reconfiguration of spectator mode not allowed");
1444 return -EINVAL;
1445 }
1446 if (newargs->ar_localflocks != oldargs->ar_localflocks) {
1447 errorfc(fc, "reconfiguration of localflocks not allowed");
1448 return -EINVAL;
1449 }
1450 if (newargs->ar_meta != oldargs->ar_meta) {
1451 errorfc(fc, "switching between gfs2 and gfs2meta not allowed");
1452 return -EINVAL;
1453 }
1454 if (oldargs->ar_spectator)
1455 fc->sb_flags |= SB_RDONLY;
1456
1457 if ((sb->s_flags ^ fc->sb_flags) & SB_RDONLY) {
1458 if (fc->sb_flags & SB_RDONLY) {
1459 error = gfs2_make_fs_ro(sdp);
1460 if (error)
1461 errorfc(fc, "unable to remount read-only");
1462 } else {
1463 error = gfs2_make_fs_rw(sdp);
1464 if (error)
1465 errorfc(fc, "unable to remount read-write");
1466 }
1467 }
1468 sdp->sd_args = *newargs;
1469
1470 if (sdp->sd_args.ar_posix_acl)
1471 sb->s_flags |= SB_POSIXACL;
1472 else
1473 sb->s_flags &= ~SB_POSIXACL;
1474 if (sdp->sd_args.ar_nobarrier)
1475 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1476 else
1477 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1478 spin_lock(&gt->gt_spin);
1479 gt->gt_logd_secs = newargs->ar_commit;
1480 gt->gt_quota_quantum = newargs->ar_quota_quantum;
1481 if (newargs->ar_statfs_quantum) {
1482 gt->gt_statfs_slow = 0;
1483 gt->gt_statfs_quantum = newargs->ar_statfs_quantum;
1484 }
1485 else {
1486 gt->gt_statfs_slow = 1;
1487 gt->gt_statfs_quantum = 30;
1488 }
1489 spin_unlock(&gt->gt_spin);
1490
1491 gfs2_online_uevent(sdp);
1492 return error;
1493 }
1494
1495 static const struct fs_context_operations gfs2_context_ops = {
1496 .free = gfs2_fc_free,
1497 .parse_param = gfs2_parse_param,
1498 .get_tree = gfs2_get_tree,
1499 .reconfigure = gfs2_reconfigure,
1500 };
1501
1502 /* Set up the filesystem mount context */
1503 static int gfs2_init_fs_context(struct fs_context *fc)
1504 {
1505 struct gfs2_args *args;
1506
1507 args = kmalloc(sizeof(*args), GFP_KERNEL);
1508 if (args == NULL)
1509 return -ENOMEM;
1510
1511 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
1512 struct gfs2_sbd *sdp = fc->root->d_sb->s_fs_info;
1513
1514 *args = sdp->sd_args;
1515 } else {
1516 memset(args, 0, sizeof(*args));
1517 args->ar_quota = GFS2_QUOTA_DEFAULT;
1518 args->ar_data = GFS2_DATA_DEFAULT;
1519 args->ar_commit = 30;
1520 args->ar_statfs_quantum = 30;
1521 args->ar_quota_quantum = 60;
1522 args->ar_errors = GFS2_ERRORS_DEFAULT;
1523 }
1524 fc->fs_private = args;
1525 fc->ops = &gfs2_context_ops;
1526 return 0;
1527 }
1528
1529 static int set_meta_super(struct super_block *s, struct fs_context *fc)
1530 {
1531 return -EINVAL;
1532 }
1533
1534 static int test_meta_super(struct super_block *s, struct fs_context *fc)
1535 {
1536 return (fc->sget_key == s->s_bdev);
1537 }
1538
1539 static int gfs2_meta_get_tree(struct fs_context *fc)
1540 {
1541 struct super_block *s;
1542 struct gfs2_sbd *sdp;
1543 struct path path;
1544 int error;
1545
1546 if (!fc->source || !*fc->source)
1547 return -EINVAL;
1548
1549 error = kern_path(fc->source, LOOKUP_FOLLOW, &path);
1550 if (error) {
1551 pr_warn("path_lookup on %s returned error %d\n",
1552 fc->source, error);
1553 return error;
1554 }
1555 fc->fs_type = &gfs2_fs_type;
1556 fc->sget_key = path.dentry->d_sb->s_bdev;
1557 s = sget_fc(fc, test_meta_super, set_meta_super);
1558 path_put(&path);
1559 if (IS_ERR(s)) {
1560 pr_warn("gfs2 mount does not exist\n");
1561 return PTR_ERR(s);
1562 }
1563 if ((fc->sb_flags ^ s->s_flags) & SB_RDONLY) {
1564 deactivate_locked_super(s);
1565 return -EBUSY;
1566 }
1567 sdp = s->s_fs_info;
1568 fc->root = dget(sdp->sd_master_dir);
1569 return 0;
1570 }
1571
1572 static const struct fs_context_operations gfs2_meta_context_ops = {
1573 .free = gfs2_fc_free,
1574 .get_tree = gfs2_meta_get_tree,
1575 };
1576
1577 static int gfs2_meta_init_fs_context(struct fs_context *fc)
1578 {
1579 int ret = gfs2_init_fs_context(fc);
1580
1581 if (ret)
1582 return ret;
1583
1584 fc->ops = &gfs2_meta_context_ops;
1585 return 0;
1586 }
1587
1588 static void gfs2_kill_sb(struct super_block *sb)
1589 {
1590 struct gfs2_sbd *sdp = sb->s_fs_info;
1591
1592 if (sdp == NULL) {
1593 kill_block_super(sb);
1594 return;
1595 }
1596
1597 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SYNC | GFS2_LFC_KILL_SB);
1598 dput(sdp->sd_root_dir);
1599 dput(sdp->sd_master_dir);
1600 sdp->sd_root_dir = NULL;
1601 sdp->sd_master_dir = NULL;
1602 shrink_dcache_sb(sb);
1603 kill_block_super(sb);
1604 }
1605
1606 struct file_system_type gfs2_fs_type = {
1607 .name = "gfs2",
1608 .fs_flags = FS_REQUIRES_DEV,
1609 .init_fs_context = gfs2_init_fs_context,
1610 .parameters = gfs2_fs_parameters,
1611 .kill_sb = gfs2_kill_sb,
1612 .owner = THIS_MODULE,
1613 };
1614 MODULE_ALIAS_FS("gfs2");
1615
1616 struct file_system_type gfs2meta_fs_type = {
1617 .name = "gfs2meta",
1618 .fs_flags = FS_REQUIRES_DEV,
1619 .init_fs_context = gfs2_meta_init_fs_context,
1620 .owner = THIS_MODULE,
1621 };
1622 MODULE_ALIAS_FS("gfs2meta");
Linux with added FPC-III support