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drm/panfrost: Remove set but not used variable 'bo'
[linux/fpc-iii.git] / fs / gfs2 / ops_fstype.c
bloba1a8ef7ed3fde76ce1bea1a5e88a5726a96ca839
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 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh);
556 if (error)
557 break;
558
559 name.len = sprintf(buf, "journal%u", sdp->sd_journals);
560 name.hash = gfs2_disk_hash(name.name, name.len);
561
562 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL);
563 if (error == -ENOENT) {
564 error = 0;
565 break;
566 }
567
568 gfs2_glock_dq_uninit(ji_gh);
569
570 if (error)
571 break;
572
573 error = -ENOMEM;
574 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
575 if (!jd)
576 break;
577
578 INIT_LIST_HEAD(&jd->extent_list);
579 INIT_LIST_HEAD(&jd->jd_revoke_list);
580
581 INIT_WORK(&jd->jd_work, gfs2_recover_func);
582 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1);
583 if (IS_ERR_OR_NULL(jd->jd_inode)) {
584 if (!jd->jd_inode)
585 error = -ENOENT;
586 else
587 error = PTR_ERR(jd->jd_inode);
588 kfree(jd);
589 break;
590 }
591
592 spin_lock(&sdp->sd_jindex_spin);
593 jd->jd_jid = sdp->sd_journals++;
594 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
595 spin_unlock(&sdp->sd_jindex_spin);
596 }
597
598 mutex_unlock(&sdp->sd_jindex_mutex);
599
600 return error;
601 }
602
603 /**
604 * check_journal_clean - Make sure a journal is clean for a spectator mount
605 * @sdp: The GFS2 superblock
606 * @jd: The journal descriptor
607 *
608 * Returns: 0 if the journal is clean or locked, else an error
609 */
610 static int check_journal_clean(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd)
611 {
612 int error;
613 struct gfs2_holder j_gh;
614 struct gfs2_log_header_host head;
615 struct gfs2_inode *ip;
616
617 ip = GFS2_I(jd->jd_inode);
618 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_NOEXP |
619 GL_EXACT | GL_NOCACHE, &j_gh);
620 if (error) {
621 fs_err(sdp, "Error locking journal for spectator mount.\n");
622 return -EPERM;
623 }
624 error = gfs2_jdesc_check(jd);
625 if (error) {
626 fs_err(sdp, "Error checking journal for spectator mount.\n");
627 goto out_unlock;
628 }
629 error = gfs2_find_jhead(jd, &head, false);
630 if (error) {
631 fs_err(sdp, "Error parsing journal for spectator mount.\n");
632 goto out_unlock;
633 }
634 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
635 error = -EPERM;
636 fs_err(sdp, "jid=%u: Journal is dirty, so the first mounter "
637 "must not be a spectator.\n", jd->jd_jid);
638 }
639
640 out_unlock:
641 gfs2_glock_dq_uninit(&j_gh);
642 return error;
643 }
644
645 static int init_journal(struct gfs2_sbd *sdp, int undo)
646 {
647 struct inode *master = d_inode(sdp->sd_master_dir);
648 struct gfs2_holder ji_gh;
649 struct gfs2_inode *ip;
650 int jindex = 1;
651 int error = 0;
652
653 if (undo) {
654 jindex = 0;
655 goto fail_jinode_gh;
656 }
657
658 sdp->sd_jindex = gfs2_lookup_simple(master, "jindex");
659 if (IS_ERR(sdp->sd_jindex)) {
660 fs_err(sdp, "can't lookup journal index: %d\n", error);
661 return PTR_ERR(sdp->sd_jindex);
662 }
663
664 /* Load in the journal index special file */
665
666 error = gfs2_jindex_hold(sdp, &ji_gh);
667 if (error) {
668 fs_err(sdp, "can't read journal index: %d\n", error);
669 goto fail;
670 }
671
672 error = -EUSERS;
673 if (!gfs2_jindex_size(sdp)) {
674 fs_err(sdp, "no journals!\n");
675 goto fail_jindex;
676 }
677
678 atomic_set(&sdp->sd_log_blks_needed, 0);
679 if (sdp->sd_args.ar_spectator) {
680 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
681 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
682 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
683 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
684 } else {
685 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
686 fs_err(sdp, "can't mount journal #%u\n",
687 sdp->sd_lockstruct.ls_jid);
688 fs_err(sdp, "there are only %u journals (0 - %u)\n",
689 gfs2_jindex_size(sdp),
690 gfs2_jindex_size(sdp) - 1);
691 goto fail_jindex;
692 }
693 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
694
695 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
696 &gfs2_journal_glops,
697 LM_ST_EXCLUSIVE, LM_FLAG_NOEXP,
698 &sdp->sd_journal_gh);
699 if (error) {
700 fs_err(sdp, "can't acquire journal glock: %d\n", error);
701 goto fail_jindex;
702 }
703
704 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
705 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
706 LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE,
707 &sdp->sd_jinode_gh);
708 if (error) {
709 fs_err(sdp, "can't acquire journal inode glock: %d\n",
710 error);
711 goto fail_journal_gh;
712 }
713
714 error = gfs2_jdesc_check(sdp->sd_jdesc);
715 if (error) {
716 fs_err(sdp, "my journal (%u) is bad: %d\n",
717 sdp->sd_jdesc->jd_jid, error);
718 goto fail_jinode_gh;
719 }
720 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
721 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
722 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
723
724 /* Map the extents for this journal's blocks */
725 gfs2_map_journal_extents(sdp, sdp->sd_jdesc);
726 }
727 trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free));
728
729 if (sdp->sd_lockstruct.ls_first) {
730 unsigned int x;
731 for (x = 0; x < sdp->sd_journals; x++) {
732 struct gfs2_jdesc *jd = gfs2_jdesc_find(sdp, x);
733
734 if (sdp->sd_args.ar_spectator) {
735 error = check_journal_clean(sdp, jd);
736 if (error)
737 goto fail_jinode_gh;
738 continue;
739 }
740 error = gfs2_recover_journal(jd, true);
741 if (error) {
742 fs_err(sdp, "error recovering journal %u: %d\n",
743 x, error);
744 goto fail_jinode_gh;
745 }
746 }
747
748 gfs2_others_may_mount(sdp);
749 } else if (!sdp->sd_args.ar_spectator) {
750 error = gfs2_recover_journal(sdp->sd_jdesc, true);
751 if (error) {
752 fs_err(sdp, "error recovering my journal: %d\n", error);
753 goto fail_jinode_gh;
754 }
755 }
756
757 sdp->sd_log_idle = 1;
758 set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
759 gfs2_glock_dq_uninit(&ji_gh);
760 jindex = 0;
761 INIT_WORK(&sdp->sd_freeze_work, gfs2_freeze_func);
762 return 0;
763
764 fail_jinode_gh:
765 if (!sdp->sd_args.ar_spectator)
766 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
767 fail_journal_gh:
768 if (!sdp->sd_args.ar_spectator)
769 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
770 fail_jindex:
771 gfs2_jindex_free(sdp);
772 if (jindex)
773 gfs2_glock_dq_uninit(&ji_gh);
774 fail:
775 iput(sdp->sd_jindex);
776 return error;
777 }
778
779 static struct lock_class_key gfs2_quota_imutex_key;
780
781 static int init_inodes(struct gfs2_sbd *sdp, int undo)
782 {
783 int error = 0;
784 struct inode *master = d_inode(sdp->sd_master_dir);
785
786 if (undo)
787 goto fail_qinode;
788
789 error = init_journal(sdp, undo);
790 complete_all(&sdp->sd_journal_ready);
791 if (error)
792 goto fail;
793
794 /* Read in the master statfs inode */
795 sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs");
796 if (IS_ERR(sdp->sd_statfs_inode)) {
797 error = PTR_ERR(sdp->sd_statfs_inode);
798 fs_err(sdp, "can't read in statfs inode: %d\n", error);
799 goto fail_journal;
800 }
801
802 /* Read in the resource index inode */
803 sdp->sd_rindex = gfs2_lookup_simple(master, "rindex");
804 if (IS_ERR(sdp->sd_rindex)) {
805 error = PTR_ERR(sdp->sd_rindex);
806 fs_err(sdp, "can't get resource index inode: %d\n", error);
807 goto fail_statfs;
808 }
809 sdp->sd_rindex_uptodate = 0;
810
811 /* Read in the quota inode */
812 sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota");
813 if (IS_ERR(sdp->sd_quota_inode)) {
814 error = PTR_ERR(sdp->sd_quota_inode);
815 fs_err(sdp, "can't get quota file inode: %d\n", error);
816 goto fail_rindex;
817 }
818 /*
819 * i_rwsem on quota files is special. Since this inode is hidden system
820 * file, we are safe to define locking ourselves.
821 */
822 lockdep_set_class(&sdp->sd_quota_inode->i_rwsem,
823 &gfs2_quota_imutex_key);
824
825 error = gfs2_rindex_update(sdp);
826 if (error)
827 goto fail_qinode;
828
829 return 0;
830
831 fail_qinode:
832 iput(sdp->sd_quota_inode);
833 fail_rindex:
834 gfs2_clear_rgrpd(sdp);
835 iput(sdp->sd_rindex);
836 fail_statfs:
837 iput(sdp->sd_statfs_inode);
838 fail_journal:
839 init_journal(sdp, UNDO);
840 fail:
841 return error;
842 }
843
844 static int init_per_node(struct gfs2_sbd *sdp, int undo)
845 {
846 struct inode *pn = NULL;
847 char buf[30];
848 int error = 0;
849 struct gfs2_inode *ip;
850 struct inode *master = d_inode(sdp->sd_master_dir);
851
852 if (sdp->sd_args.ar_spectator)
853 return 0;
854
855 if (undo)
856 goto fail_qc_gh;
857
858 pn = gfs2_lookup_simple(master, "per_node");
859 if (IS_ERR(pn)) {
860 error = PTR_ERR(pn);
861 fs_err(sdp, "can't find per_node directory: %d\n", error);
862 return error;
863 }
864
865 sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid);
866 sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf);
867 if (IS_ERR(sdp->sd_sc_inode)) {
868 error = PTR_ERR(sdp->sd_sc_inode);
869 fs_err(sdp, "can't find local \"sc\" file: %d\n", error);
870 goto fail;
871 }
872
873 sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
874 sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
875 if (IS_ERR(sdp->sd_qc_inode)) {
876 error = PTR_ERR(sdp->sd_qc_inode);
877 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
878 goto fail_ut_i;
879 }
880
881 iput(pn);
882 pn = NULL;
883
884 ip = GFS2_I(sdp->sd_sc_inode);
885 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
886 &sdp->sd_sc_gh);
887 if (error) {
888 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
889 goto fail_qc_i;
890 }
891
892 ip = GFS2_I(sdp->sd_qc_inode);
893 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
894 &sdp->sd_qc_gh);
895 if (error) {
896 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
897 goto fail_ut_gh;
898 }
899
900 return 0;
901
902 fail_qc_gh:
903 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
904 fail_ut_gh:
905 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
906 fail_qc_i:
907 iput(sdp->sd_qc_inode);
908 fail_ut_i:
909 iput(sdp->sd_sc_inode);
910 fail:
911 iput(pn);
912 return error;
913 }
914
915 static const match_table_t nolock_tokens = {
916 { Opt_jid, "jid=%d\n", },
917 { Opt_err, NULL },
918 };
919
920 static const struct lm_lockops nolock_ops = {
921 .lm_proto_name = "lock_nolock",
922 .lm_put_lock = gfs2_glock_free,
923 .lm_tokens = &nolock_tokens,
924 };
925
926 /**
927 * gfs2_lm_mount - mount a locking protocol
928 * @sdp: the filesystem
929 * @args: mount arguments
930 * @silent: if 1, don't complain if the FS isn't a GFS2 fs
931 *
932 * Returns: errno
933 */
934
935 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
936 {
937 const struct lm_lockops *lm;
938 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
939 struct gfs2_args *args = &sdp->sd_args;
940 const char *proto = sdp->sd_proto_name;
941 const char *table = sdp->sd_table_name;
942 char *o, *options;
943 int ret;
944
945 if (!strcmp("lock_nolock", proto)) {
946 lm = &nolock_ops;
947 sdp->sd_args.ar_localflocks = 1;
948 #ifdef CONFIG_GFS2_FS_LOCKING_DLM
949 } else if (!strcmp("lock_dlm", proto)) {
950 lm = &gfs2_dlm_ops;
951 #endif
952 } else {
953 pr_info("can't find protocol %s\n", proto);
954 return -ENOENT;
955 }
956
957 fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);
958
959 ls->ls_ops = lm;
960 ls->ls_first = 1;
961
962 for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) {
963 substring_t tmp[MAX_OPT_ARGS];
964 int token, option;
965
966 if (!o || !*o)
967 continue;
968
969 token = match_token(o, *lm->lm_tokens, tmp);
970 switch (token) {
971 case Opt_jid:
972 ret = match_int(&tmp[0], &option);
973 if (ret || option < 0)
974 goto hostdata_error;
975 if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags))
976 ls->ls_jid = option;
977 break;
978 case Opt_id:
979 case Opt_nodir:
980 /* Obsolete, but left for backward compat purposes */
981 break;
982 case Opt_first:
983 ret = match_int(&tmp[0], &option);
984 if (ret || (option != 0 && option != 1))
985 goto hostdata_error;
986 ls->ls_first = option;
987 break;
988 case Opt_err:
989 default:
990 hostdata_error:
991 fs_info(sdp, "unknown hostdata (%s)\n", o);
992 return -EINVAL;
993 }
994 }
995
996 if (lm->lm_mount == NULL) {
997 fs_info(sdp, "Now mounting FS...\n");
998 complete_all(&sdp->sd_locking_init);
999 return 0;
1000 }
1001 ret = lm->lm_mount(sdp, table);
1002 if (ret == 0)
1003 fs_info(sdp, "Joined cluster. Now mounting FS...\n");
1004 complete_all(&sdp->sd_locking_init);
1005 return ret;
1006 }
1007
1008 void gfs2_lm_unmount(struct gfs2_sbd *sdp)
1009 {
1010 const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops;
1011 if (likely(!gfs2_withdrawn(sdp)) && lm->lm_unmount)
1012 lm->lm_unmount(sdp);
1013 }
1014
1015 static int wait_on_journal(struct gfs2_sbd *sdp)
1016 {
1017 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
1018 return 0;
1019
1020 return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, TASK_INTERRUPTIBLE)
1021 ? -EINTR : 0;
1022 }
1023
1024 void gfs2_online_uevent(struct gfs2_sbd *sdp)
1025 {
1026 struct super_block *sb = sdp->sd_vfs;
1027 char ro[20];
1028 char spectator[20];
1029 char *envp[] = { ro, spectator, NULL };
1030 sprintf(ro, "RDONLY=%d", sb_rdonly(sb));
1031 sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
1032 kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp);
1033 }
1034
1035 /**
1036 * gfs2_fill_super - Read in superblock
1037 * @sb: The VFS superblock
1038 * @args: Mount options
1039 * @silent: Don't complain if it's not a GFS2 filesystem
1040 *
1041 * Returns: -errno
1042 */
1043 static int gfs2_fill_super(struct super_block *sb, struct fs_context *fc)
1044 {
1045 struct gfs2_args *args = fc->fs_private;
1046 int silent = fc->sb_flags & SB_SILENT;
1047 struct gfs2_sbd *sdp;
1048 struct gfs2_holder mount_gh;
1049 int error;
1050
1051 sdp = init_sbd(sb);
1052 if (!sdp) {
1053 pr_warn("can't alloc struct gfs2_sbd\n");
1054 return -ENOMEM;
1055 }
1056 sdp->sd_args = *args;
1057
1058 if (sdp->sd_args.ar_spectator) {
1059 sb->s_flags |= SB_RDONLY;
1060 set_bit(SDF_RORECOVERY, &sdp->sd_flags);
1061 }
1062 if (sdp->sd_args.ar_posix_acl)
1063 sb->s_flags |= SB_POSIXACL;
1064 if (sdp->sd_args.ar_nobarrier)
1065 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1066
1067 sb->s_flags |= SB_NOSEC;
1068 sb->s_magic = GFS2_MAGIC;
1069 sb->s_op = &gfs2_super_ops;
1070 sb->s_d_op = &gfs2_dops;
1071 sb->s_export_op = &gfs2_export_ops;
1072 sb->s_xattr = gfs2_xattr_handlers;
1073 sb->s_qcop = &gfs2_quotactl_ops;
1074 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1075 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
1076 sb->s_time_gran = 1;
1077 sb->s_maxbytes = MAX_LFS_FILESIZE;
1078
1079 /* Set up the buffer cache and fill in some fake block size values
1080 to allow us to read-in the on-disk superblock. */
1081 sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
1082 sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
1083 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
1084 GFS2_BASIC_BLOCK_SHIFT;
1085 sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift);
1086
1087 sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit;
1088 sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum;
1089 if (sdp->sd_args.ar_statfs_quantum) {
1090 sdp->sd_tune.gt_statfs_slow = 0;
1091 sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum;
1092 } else {
1093 sdp->sd_tune.gt_statfs_slow = 1;
1094 sdp->sd_tune.gt_statfs_quantum = 30;
1095 }
1096
1097 error = init_names(sdp, silent);
1098 if (error) {
1099 /* In this case, we haven't initialized sysfs, so we have to
1100 manually free the sdp. */
1101 free_sbd(sdp);
1102 sb->s_fs_info = NULL;
1103 return error;
1104 }
1105
1106 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s", sdp->sd_table_name);
1107
1108 error = gfs2_sys_fs_add(sdp);
1109 /*
1110 * If we hit an error here, gfs2_sys_fs_add will have called function
1111 * kobject_put which causes the sysfs usage count to go to zero, which
1112 * causes sysfs to call function gfs2_sbd_release, which frees sdp.
1113 * Subsequent error paths here will call gfs2_sys_fs_del, which also
1114 * kobject_put to free sdp.
1115 */
1116 if (error)
1117 return error;
1118
1119 gfs2_create_debugfs_file(sdp);
1120
1121 error = gfs2_lm_mount(sdp, silent);
1122 if (error)
1123 goto fail_debug;
1124
1125 error = init_locking(sdp, &mount_gh, DO);
1126 if (error)
1127 goto fail_lm;
1128
1129 error = init_sb(sdp, silent);
1130 if (error)
1131 goto fail_locking;
1132
1133 error = wait_on_journal(sdp);
1134 if (error)
1135 goto fail_sb;
1136
1137 /*
1138 * If user space has failed to join the cluster or some similar
1139 * failure has occurred, then the journal id will contain a
1140 * negative (error) number. This will then be returned to the
1141 * caller (of the mount syscall). We do this even for spectator
1142 * mounts (which just write a jid of 0 to indicate "ok" even though
1143 * the jid is unused in the spectator case)
1144 */
1145 if (sdp->sd_lockstruct.ls_jid < 0) {
1146 error = sdp->sd_lockstruct.ls_jid;
1147 sdp->sd_lockstruct.ls_jid = 0;
1148 goto fail_sb;
1149 }
1150
1151 if (sdp->sd_args.ar_spectator)
1152 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.s",
1153 sdp->sd_table_name);
1154 else
1155 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.%u",
1156 sdp->sd_table_name, sdp->sd_lockstruct.ls_jid);
1157
1158 error = init_inodes(sdp, DO);
1159 if (error)
1160 goto fail_sb;
1161
1162 error = init_per_node(sdp, DO);
1163 if (error)
1164 goto fail_inodes;
1165
1166 error = gfs2_statfs_init(sdp);
1167 if (error) {
1168 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
1169 goto fail_per_node;
1170 }
1171
1172 if (!sb_rdonly(sb)) {
1173 error = gfs2_make_fs_rw(sdp);
1174 if (error) {
1175 fs_err(sdp, "can't make FS RW: %d\n", error);
1176 goto fail_per_node;
1177 }
1178 }
1179
1180 gfs2_glock_dq_uninit(&mount_gh);
1181 gfs2_online_uevent(sdp);
1182 return 0;
1183
1184 fail_per_node:
1185 init_per_node(sdp, UNDO);
1186 fail_inodes:
1187 init_inodes(sdp, UNDO);
1188 fail_sb:
1189 if (sdp->sd_root_dir)
1190 dput(sdp->sd_root_dir);
1191 if (sdp->sd_master_dir)
1192 dput(sdp->sd_master_dir);
1193 if (sb->s_root)
1194 dput(sb->s_root);
1195 sb->s_root = NULL;
1196 fail_locking:
1197 init_locking(sdp, &mount_gh, UNDO);
1198 fail_lm:
1199 complete_all(&sdp->sd_journal_ready);
1200 gfs2_gl_hash_clear(sdp);
1201 gfs2_lm_unmount(sdp);
1202 fail_debug:
1203 gfs2_delete_debugfs_file(sdp);
1204 /* gfs2_sys_fs_del must be the last thing we do, since it causes
1205 * sysfs to call function gfs2_sbd_release, which frees sdp. */
1206 gfs2_sys_fs_del(sdp);
1207 sb->s_fs_info = NULL;
1208 return error;
1209 }
1210
1211 /**
1212 * gfs2_get_tree - Get the GFS2 superblock and root directory
1213 * @fc: The filesystem context
1214 *
1215 * Returns: 0 or -errno on error
1216 */
1217 static int gfs2_get_tree(struct fs_context *fc)
1218 {
1219 struct gfs2_args *args = fc->fs_private;
1220 struct gfs2_sbd *sdp;
1221 int error;
1222
1223 error = get_tree_bdev(fc, gfs2_fill_super);
1224 if (error)
1225 return error;
1226
1227 sdp = fc->root->d_sb->s_fs_info;
1228 dput(fc->root);
1229 if (args->ar_meta)
1230 fc->root = dget(sdp->sd_master_dir);
1231 else
1232 fc->root = dget(sdp->sd_root_dir);
1233 return 0;
1234 }
1235
1236 static void gfs2_fc_free(struct fs_context *fc)
1237 {
1238 struct gfs2_args *args = fc->fs_private;
1239
1240 kfree(args);
1241 }
1242
1243 enum gfs2_param {
1244 Opt_lockproto,
1245 Opt_locktable,
1246 Opt_hostdata,
1247 Opt_spectator,
1248 Opt_ignore_local_fs,
1249 Opt_localflocks,
1250 Opt_localcaching,
1251 Opt_debug,
1252 Opt_upgrade,
1253 Opt_acl,
1254 Opt_quota,
1255 Opt_quota_flag,
1256 Opt_suiddir,
1257 Opt_data,
1258 Opt_meta,
1259 Opt_discard,
1260 Opt_commit,
1261 Opt_errors,
1262 Opt_statfs_quantum,
1263 Opt_statfs_percent,
1264 Opt_quota_quantum,
1265 Opt_barrier,
1266 Opt_rgrplvb,
1267 Opt_loccookie,
1268 };
1269
1270 static const struct constant_table gfs2_param_quota[] = {
1271 {"off", GFS2_QUOTA_OFF},
1272 {"account", GFS2_QUOTA_ACCOUNT},
1273 {"on", GFS2_QUOTA_ON},
1274 {}
1275 };
1276
1277 enum opt_data {
1278 Opt_data_writeback = GFS2_DATA_WRITEBACK,
1279 Opt_data_ordered = GFS2_DATA_ORDERED,
1280 };
1281
1282 static const struct constant_table gfs2_param_data[] = {
1283 {"writeback", Opt_data_writeback },
1284 {"ordered", Opt_data_ordered },
1285 {}
1286 };
1287
1288 enum opt_errors {
1289 Opt_errors_withdraw = GFS2_ERRORS_WITHDRAW,
1290 Opt_errors_panic = GFS2_ERRORS_PANIC,
1291 };
1292
1293 static const struct constant_table gfs2_param_errors[] = {
1294 {"withdraw", Opt_errors_withdraw },
1295 {"panic", Opt_errors_panic },
1296 {}
1297 };
1298
1299 static const struct fs_parameter_spec gfs2_fs_parameters[] = {
1300 fsparam_string ("lockproto", Opt_lockproto),
1301 fsparam_string ("locktable", Opt_locktable),
1302 fsparam_string ("hostdata", Opt_hostdata),
1303 fsparam_flag ("spectator", Opt_spectator),
1304 fsparam_flag ("norecovery", Opt_spectator),
1305 fsparam_flag ("ignore_local_fs", Opt_ignore_local_fs),
1306 fsparam_flag ("localflocks", Opt_localflocks),
1307 fsparam_flag ("localcaching", Opt_localcaching),
1308 fsparam_flag_no("debug", Opt_debug),
1309 fsparam_flag ("upgrade", Opt_upgrade),
1310 fsparam_flag_no("acl", Opt_acl),
1311 fsparam_flag_no("suiddir", Opt_suiddir),
1312 fsparam_enum ("data", Opt_data, gfs2_param_data),
1313 fsparam_flag ("meta", Opt_meta),
1314 fsparam_flag_no("discard", Opt_discard),
1315 fsparam_s32 ("commit", Opt_commit),
1316 fsparam_enum ("errors", Opt_errors, gfs2_param_errors),
1317 fsparam_s32 ("statfs_quantum", Opt_statfs_quantum),
1318 fsparam_s32 ("statfs_percent", Opt_statfs_percent),
1319 fsparam_s32 ("quota_quantum", Opt_quota_quantum),
1320 fsparam_flag_no("barrier", Opt_barrier),
1321 fsparam_flag_no("rgrplvb", Opt_rgrplvb),
1322 fsparam_flag_no("loccookie", Opt_loccookie),
1323 /* quota can be a flag or an enum so it gets special treatment */
1324 fsparam_flag_no("quota", Opt_quota_flag),
1325 fsparam_enum("quota", Opt_quota, gfs2_param_quota),
1326 {}
1327 };
1328
1329 /* Parse a single mount parameter */
1330 static int gfs2_parse_param(struct fs_context *fc, struct fs_parameter *param)
1331 {
1332 struct gfs2_args *args = fc->fs_private;
1333 struct fs_parse_result result;
1334 int o;
1335
1336 o = fs_parse(fc, gfs2_fs_parameters, param, &result);
1337 if (o < 0)
1338 return o;
1339
1340 switch (o) {
1341 case Opt_lockproto:
1342 strlcpy(args->ar_lockproto, param->string, GFS2_LOCKNAME_LEN);
1343 break;
1344 case Opt_locktable:
1345 strlcpy(args->ar_locktable, param->string, GFS2_LOCKNAME_LEN);
1346 break;
1347 case Opt_hostdata:
1348 strlcpy(args->ar_hostdata, param->string, GFS2_LOCKNAME_LEN);
1349 break;
1350 case Opt_spectator:
1351 args->ar_spectator = 1;
1352 break;
1353 case Opt_ignore_local_fs:
1354 /* Retained for backwards compat only */
1355 break;
1356 case Opt_localflocks:
1357 args->ar_localflocks = 1;
1358 break;
1359 case Opt_localcaching:
1360 /* Retained for backwards compat only */
1361 break;
1362 case Opt_debug:
1363 if (result.boolean && args->ar_errors == GFS2_ERRORS_PANIC)
1364 return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive");
1365 args->ar_debug = result.boolean;
1366 break;
1367 case Opt_upgrade:
1368 /* Retained for backwards compat only */
1369 break;
1370 case Opt_acl:
1371 args->ar_posix_acl = result.boolean;
1372 break;
1373 case Opt_quota_flag:
1374 args->ar_quota = result.negated ? GFS2_QUOTA_OFF : GFS2_QUOTA_ON;
1375 break;
1376 case Opt_quota:
1377 args->ar_quota = result.int_32;
1378 break;
1379 case Opt_suiddir:
1380 args->ar_suiddir = result.boolean;
1381 break;
1382 case Opt_data:
1383 /* The uint_32 result maps directly to GFS2_DATA_* */
1384 args->ar_data = result.uint_32;
1385 break;
1386 case Opt_meta:
1387 args->ar_meta = 1;
1388 break;
1389 case Opt_discard:
1390 args->ar_discard = result.boolean;
1391 break;
1392 case Opt_commit:
1393 if (result.int_32 <= 0)
1394 return invalfc(fc, "commit mount option requires a positive numeric argument");
1395 args->ar_commit = result.int_32;
1396 break;
1397 case Opt_statfs_quantum:
1398 if (result.int_32 < 0)
1399 return invalfc(fc, "statfs_quantum mount option requires a non-negative numeric argument");
1400 args->ar_statfs_quantum = result.int_32;
1401 break;
1402 case Opt_quota_quantum:
1403 if (result.int_32 <= 0)
1404 return invalfc(fc, "quota_quantum mount option requires a positive numeric argument");
1405 args->ar_quota_quantum = result.int_32;
1406 break;
1407 case Opt_statfs_percent:
1408 if (result.int_32 < 0 || result.int_32 > 100)
1409 return invalfc(fc, "statfs_percent mount option requires a numeric argument between 0 and 100");
1410 args->ar_statfs_percent = result.int_32;
1411 break;
1412 case Opt_errors:
1413 if (args->ar_debug && result.uint_32 == GFS2_ERRORS_PANIC)
1414 return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive");
1415 args->ar_errors = result.uint_32;
1416 break;
1417 case Opt_barrier:
1418 args->ar_nobarrier = result.boolean;
1419 break;
1420 case Opt_rgrplvb:
1421 args->ar_rgrplvb = result.boolean;
1422 break;
1423 case Opt_loccookie:
1424 args->ar_loccookie = result.boolean;
1425 break;
1426 default:
1427 return invalfc(fc, "invalid mount option: %s", param->key);
1428 }
1429 return 0;
1430 }
1431
1432 static int gfs2_reconfigure(struct fs_context *fc)
1433 {
1434 struct super_block *sb = fc->root->d_sb;
1435 struct gfs2_sbd *sdp = sb->s_fs_info;
1436 struct gfs2_args *oldargs = &sdp->sd_args;
1437 struct gfs2_args *newargs = fc->fs_private;
1438 struct gfs2_tune *gt = &sdp->sd_tune;
1439 int error = 0;
1440
1441 sync_filesystem(sb);
1442
1443 spin_lock(&gt->gt_spin);
1444 oldargs->ar_commit = gt->gt_logd_secs;
1445 oldargs->ar_quota_quantum = gt->gt_quota_quantum;
1446 if (gt->gt_statfs_slow)
1447 oldargs->ar_statfs_quantum = 0;
1448 else
1449 oldargs->ar_statfs_quantum = gt->gt_statfs_quantum;
1450 spin_unlock(&gt->gt_spin);
1451
1452 if (strcmp(newargs->ar_lockproto, oldargs->ar_lockproto)) {
1453 errorfc(fc, "reconfiguration of locking protocol not allowed");
1454 return -EINVAL;
1455 }
1456 if (strcmp(newargs->ar_locktable, oldargs->ar_locktable)) {
1457 errorfc(fc, "reconfiguration of lock table not allowed");
1458 return -EINVAL;
1459 }
1460 if (strcmp(newargs->ar_hostdata, oldargs->ar_hostdata)) {
1461 errorfc(fc, "reconfiguration of host data not allowed");
1462 return -EINVAL;
1463 }
1464 if (newargs->ar_spectator != oldargs->ar_spectator) {
1465 errorfc(fc, "reconfiguration of spectator mode not allowed");
1466 return -EINVAL;
1467 }
1468 if (newargs->ar_localflocks != oldargs->ar_localflocks) {
1469 errorfc(fc, "reconfiguration of localflocks not allowed");
1470 return -EINVAL;
1471 }
1472 if (newargs->ar_meta != oldargs->ar_meta) {
1473 errorfc(fc, "switching between gfs2 and gfs2meta not allowed");
1474 return -EINVAL;
1475 }
1476 if (oldargs->ar_spectator)
1477 fc->sb_flags |= SB_RDONLY;
1478
1479 if ((sb->s_flags ^ fc->sb_flags) & SB_RDONLY) {
1480 if (fc->sb_flags & SB_RDONLY) {
1481 error = gfs2_make_fs_ro(sdp);
1482 if (error)
1483 errorfc(fc, "unable to remount read-only");
1484 } else {
1485 error = gfs2_make_fs_rw(sdp);
1486 if (error)
1487 errorfc(fc, "unable to remount read-write");
1488 }
1489 }
1490 sdp->sd_args = *newargs;
1491
1492 if (sdp->sd_args.ar_posix_acl)
1493 sb->s_flags |= SB_POSIXACL;
1494 else
1495 sb->s_flags &= ~SB_POSIXACL;
1496 if (sdp->sd_args.ar_nobarrier)
1497 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1498 else
1499 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1500 spin_lock(&gt->gt_spin);
1501 gt->gt_logd_secs = newargs->ar_commit;
1502 gt->gt_quota_quantum = newargs->ar_quota_quantum;
1503 if (newargs->ar_statfs_quantum) {
1504 gt->gt_statfs_slow = 0;
1505 gt->gt_statfs_quantum = newargs->ar_statfs_quantum;
1506 }
1507 else {
1508 gt->gt_statfs_slow = 1;
1509 gt->gt_statfs_quantum = 30;
1510 }
1511 spin_unlock(&gt->gt_spin);
1512
1513 gfs2_online_uevent(sdp);
1514 return error;
1515 }
1516
1517 static const struct fs_context_operations gfs2_context_ops = {
1518 .free = gfs2_fc_free,
1519 .parse_param = gfs2_parse_param,
1520 .get_tree = gfs2_get_tree,
1521 .reconfigure = gfs2_reconfigure,
1522 };
1523
1524 /* Set up the filesystem mount context */
1525 static int gfs2_init_fs_context(struct fs_context *fc)
1526 {
1527 struct gfs2_args *args;
1528
1529 args = kmalloc(sizeof(*args), GFP_KERNEL);
1530 if (args == NULL)
1531 return -ENOMEM;
1532
1533 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
1534 struct gfs2_sbd *sdp = fc->root->d_sb->s_fs_info;
1535
1536 *args = sdp->sd_args;
1537 } else {
1538 memset(args, 0, sizeof(*args));
1539 args->ar_quota = GFS2_QUOTA_DEFAULT;
1540 args->ar_data = GFS2_DATA_DEFAULT;
1541 args->ar_commit = 30;
1542 args->ar_statfs_quantum = 30;
1543 args->ar_quota_quantum = 60;
1544 args->ar_errors = GFS2_ERRORS_DEFAULT;
1545 }
1546 fc->fs_private = args;
1547 fc->ops = &gfs2_context_ops;
1548 return 0;
1549 }
1550
1551 static int set_meta_super(struct super_block *s, struct fs_context *fc)
1552 {
1553 return -EINVAL;
1554 }
1555
1556 static int test_meta_super(struct super_block *s, struct fs_context *fc)
1557 {
1558 return (fc->sget_key == s->s_bdev);
1559 }
1560
1561 static int gfs2_meta_get_tree(struct fs_context *fc)
1562 {
1563 struct super_block *s;
1564 struct gfs2_sbd *sdp;
1565 struct path path;
1566 int error;
1567
1568 if (!fc->source || !*fc->source)
1569 return -EINVAL;
1570
1571 error = kern_path(fc->source, LOOKUP_FOLLOW, &path);
1572 if (error) {
1573 pr_warn("path_lookup on %s returned error %d\n",
1574 fc->source, error);
1575 return error;
1576 }
1577 fc->fs_type = &gfs2_fs_type;
1578 fc->sget_key = path.dentry->d_sb->s_bdev;
1579 s = sget_fc(fc, test_meta_super, set_meta_super);
1580 path_put(&path);
1581 if (IS_ERR(s)) {
1582 pr_warn("gfs2 mount does not exist\n");
1583 return PTR_ERR(s);
1584 }
1585 if ((fc->sb_flags ^ s->s_flags) & SB_RDONLY) {
1586 deactivate_locked_super(s);
1587 return -EBUSY;
1588 }
1589 sdp = s->s_fs_info;
1590 fc->root = dget(sdp->sd_master_dir);
1591 return 0;
1592 }
1593
1594 static const struct fs_context_operations gfs2_meta_context_ops = {
1595 .free = gfs2_fc_free,
1596 .get_tree = gfs2_meta_get_tree,
1597 };
1598
1599 static int gfs2_meta_init_fs_context(struct fs_context *fc)
1600 {
1601 int ret = gfs2_init_fs_context(fc);
1602
1603 if (ret)
1604 return ret;
1605
1606 fc->ops = &gfs2_meta_context_ops;
1607 return 0;
1608 }
1609
1610 static void gfs2_kill_sb(struct super_block *sb)
1611 {
1612 struct gfs2_sbd *sdp = sb->s_fs_info;
1613
1614 if (sdp == NULL) {
1615 kill_block_super(sb);
1616 return;
1617 }
1618
1619 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SYNC | GFS2_LFC_KILL_SB);
1620 dput(sdp->sd_root_dir);
1621 dput(sdp->sd_master_dir);
1622 sdp->sd_root_dir = NULL;
1623 sdp->sd_master_dir = NULL;
1624 shrink_dcache_sb(sb);
1625 kill_block_super(sb);
1626 }
1627
1628 struct file_system_type gfs2_fs_type = {
1629 .name = "gfs2",
1630 .fs_flags = FS_REQUIRES_DEV,
1631 .init_fs_context = gfs2_init_fs_context,
1632 .parameters = gfs2_fs_parameters,
1633 .kill_sb = gfs2_kill_sb,
1634 .owner = THIS_MODULE,
1635 };
1636 MODULE_ALIAS_FS("gfs2");
1637
1638 struct file_system_type gfs2meta_fs_type = {
1639 .name = "gfs2meta",
1640 .fs_flags = FS_REQUIRES_DEV,
1641 .init_fs_context = gfs2_meta_init_fs_context,
1642 .owner = THIS_MODULE,
1643 };
1644 MODULE_ALIAS_FS("gfs2meta");
Linux with added FPC-III support