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
53static 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
65void free_sbd(struct gfs2_sbd *sdp)
66{
67 if (sdp->sd_lkstats)
68 free_percpu(pdata: sdp->sd_lkstats);
69 kfree(objp: sdp);
70}
71
72static struct gfs2_sbd *init_sbd(struct super_block *sb)
73{
74 struct gfs2_sbd *sdp;
75 struct address_space *mapping;
76
77 sdp = kzalloc(size: 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(nr: SDF_NOJOURNALID, addr: &sdp->sd_flags);
88 gfs2_tune_init(gt: &sdp->sd_tune);
89
90 init_waitqueue_head(&sdp->sd_kill_wait);
91 init_waitqueue_head(&sdp->sd_async_glock_wait);
92 atomic_set(v: &sdp->sd_glock_disposal, i: 0);
93 init_completion(x: &sdp->sd_locking_init);
94 init_completion(x: &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(list: &sdp->sd_jindex_list);
101 spin_lock_init(&sdp->sd_jindex_spin);
102 mutex_init(&sdp->sd_jindex_mutex);
103 init_completion(x: &sdp->sd_journal_ready);
104
105 INIT_LIST_HEAD(list: &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 spin_lock_init(&sdp->sd_bitmap_lock);
110
111 INIT_LIST_HEAD(list: &sdp->sd_sc_inodes_list);
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(m: mapping, GFP_NOFS);
120 mapping->i_private_data = NULL;
121 mapping->writeback_index = 0;
122
123 spin_lock_init(&sdp->sd_log_lock);
124 atomic_set(v: &sdp->sd_log_pinned, i: 0);
125 INIT_LIST_HEAD(list: &sdp->sd_log_revokes);
126 INIT_LIST_HEAD(list: &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(list: &sdp->sd_ail1_list);
133 INIT_LIST_HEAD(list: &sdp->sd_ail2_list);
134
135 init_rwsem(&sdp->sd_log_flush_lock);
136 atomic_set(v: &sdp->sd_log_in_flight, i: 0);
137 init_waitqueue_head(&sdp->sd_log_flush_wait);
138 mutex_init(&sdp->sd_freeze_mutex);
139
140 return sdp;
141
142fail:
143 free_sbd(sdp);
144 return NULL;
145}
146
147/**
148 * gfs2_check_sb - Check superblock
149 * @sdp: the filesystem
150 * @silent: Don't print a message if the check fails
151 *
152 * Checks the version code of the FS is one that we understand how to
153 * read and that the sizes of the various on-disk structures have not
154 * changed.
155 */
156
157static int gfs2_check_sb(struct gfs2_sbd *sdp, int silent)
158{
159 struct gfs2_sb_host *sb = &sdp->sd_sb;
160
161 if (sb->sb_magic != GFS2_MAGIC ||
162 sb->sb_type != GFS2_METATYPE_SB) {
163 if (!silent)
164 pr_warn("not a GFS2 filesystem\n");
165 return -EINVAL;
166 }
167
168 if (sb->sb_fs_format < GFS2_FS_FORMAT_MIN ||
169 sb->sb_fs_format > GFS2_FS_FORMAT_MAX ||
170 sb->sb_multihost_format != GFS2_FORMAT_MULTI) {
171 fs_warn(sdp, "Unknown on-disk format, unable to mount\n");
172 return -EINVAL;
173 }
174
175 if (sb->sb_bsize < 512 || sb->sb_bsize > PAGE_SIZE ||
176 (sb->sb_bsize & (sb->sb_bsize - 1))) {
177 pr_warn("Invalid block size\n");
178 return -EINVAL;
179 }
180 if (sb->sb_bsize_shift != ffs(sb->sb_bsize) - 1) {
181 pr_warn("Invalid block size shift\n");
182 return -EINVAL;
183 }
184 return 0;
185}
186
187static void end_bio_io_page(struct bio *bio)
188{
189 struct page *page = bio->bi_private;
190
191 if (!bio->bi_status)
192 SetPageUptodate(page);
193 else
194 pr_warn("error %d reading superblock\n", bio->bi_status);
195 unlock_page(page);
196}
197
198static void gfs2_sb_in(struct gfs2_sbd *sdp, const void *buf)
199{
200 struct gfs2_sb_host *sb = &sdp->sd_sb;
201 struct super_block *s = sdp->sd_vfs;
202 const struct gfs2_sb *str = buf;
203
204 sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic);
205 sb->sb_type = be32_to_cpu(str->sb_header.mh_type);
206 sb->sb_fs_format = be32_to_cpu(str->sb_fs_format);
207 sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format);
208 sb->sb_bsize = be32_to_cpu(str->sb_bsize);
209 sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift);
210 sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr);
211 sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino);
212 sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr);
213 sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino);
214
215 memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN);
216 memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN);
217 super_set_uuid(sb: s, uuid: str->sb_uuid, len: 16);
218}
219
220/**
221 * gfs2_read_super - Read the gfs2 super block from disk
222 * @sdp: The GFS2 super block
223 * @sector: The location of the super block
224 * @silent: Don't print a message if the check fails
225 *
226 * This uses the bio functions to read the super block from disk
227 * because we want to be 100% sure that we never read cached data.
228 * A super block is read twice only during each GFS2 mount and is
229 * never written to by the filesystem. The first time its read no
230 * locks are held, and the only details which are looked at are those
231 * relating to the locking protocol. Once locking is up and working,
232 * the sb is read again under the lock to establish the location of
233 * the master directory (contains pointers to journals etc) and the
234 * root directory.
235 *
236 * Returns: 0 on success or error
237 */
238
239static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector, int silent)
240{
241 struct super_block *sb = sdp->sd_vfs;
242 struct gfs2_sb *p;
243 struct page *page;
244 struct bio *bio;
245
246 page = alloc_page(GFP_NOFS);
247 if (unlikely(!page))
248 return -ENOMEM;
249
250 ClearPageUptodate(page);
251 ClearPageDirty(page);
252 lock_page(page);
253
254 bio = bio_alloc(bdev: sb->s_bdev, nr_vecs: 1, opf: REQ_OP_READ | REQ_META, GFP_NOFS);
255 bio->bi_iter.bi_sector = sector * (sb->s_blocksize >> 9);
256 __bio_add_page(bio, page, PAGE_SIZE, off: 0);
257
258 bio->bi_end_io = end_bio_io_page;
259 bio->bi_private = page;
260 submit_bio(bio);
261 wait_on_page_locked(page);
262 bio_put(bio);
263 if (!PageUptodate(page)) {
264 __free_page(page);
265 return -EIO;
266 }
267 p = kmap(page);
268 gfs2_sb_in(sdp, buf: p);
269 kunmap(page);
270 __free_page(page);
271 return gfs2_check_sb(sdp, silent);
272}
273
274/**
275 * gfs2_read_sb - Read super block
276 * @sdp: The GFS2 superblock
277 * @silent: Don't print message if mount fails
278 *
279 */
280
281static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent)
282{
283 u32 hash_blocks, ind_blocks, leaf_blocks;
284 u32 tmp_blocks;
285 unsigned int x;
286 int error;
287
288 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
289 if (error) {
290 if (!silent)
291 fs_err(sdp, "can't read superblock\n");
292 return error;
293 }
294
295 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift - 9;
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 /*
315 * We always keep at least one block reserved for revokes in
316 * transactions. This greatly simplifies allocating additional
317 * revoke blocks.
318 */
319 atomic_set(v: &sdp->sd_log_revokes_available, i: sdp->sd_ldptrs);
320
321 /* Compute maximum reservation required to add a entry to a directory */
322
323 hash_blocks = DIV_ROUND_UP(sizeof(u64) * BIT(GFS2_DIR_MAX_DEPTH),
324 sdp->sd_jbsize);
325
326 ind_blocks = 0;
327 for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
328 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
329 ind_blocks += tmp_blocks;
330 }
331
332 leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
333
334 sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
335
336 sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
337 sizeof(struct gfs2_dinode);
338 sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
339 for (x = 2;; x++) {
340 u64 space, d;
341 u32 m;
342
343 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
344 d = space;
345 m = do_div(d, sdp->sd_inptrs);
346
347 if (d != sdp->sd_heightsize[x - 1] || m)
348 break;
349 sdp->sd_heightsize[x] = space;
350 }
351 sdp->sd_max_height = x;
352 sdp->sd_heightsize[x] = ~0;
353 gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
354
355 sdp->sd_max_dents_per_leaf = (sdp->sd_sb.sb_bsize -
356 sizeof(struct gfs2_leaf)) /
357 GFS2_MIN_DIRENT_SIZE;
358 return 0;
359}
360
361static int init_names(struct gfs2_sbd *sdp, int silent)
362{
363 char *proto, *table;
364 int error = 0;
365
366 proto = sdp->sd_args.ar_lockproto;
367 table = sdp->sd_args.ar_locktable;
368
369 /* Try to autodetect */
370
371 if (!proto[0] || !table[0]) {
372 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
373 if (error)
374 return error;
375
376 if (!proto[0])
377 proto = sdp->sd_sb.sb_lockproto;
378 if (!table[0])
379 table = sdp->sd_sb.sb_locktable;
380 }
381
382 if (!table[0])
383 table = sdp->sd_vfs->s_id;
384
385 BUILD_BUG_ON(GFS2_LOCKNAME_LEN > GFS2_FSNAME_LEN);
386
387 strscpy(sdp->sd_proto_name, proto, GFS2_LOCKNAME_LEN);
388 strscpy(sdp->sd_table_name, table, GFS2_LOCKNAME_LEN);
389
390 table = sdp->sd_table_name;
391 while ((table = strchr(table, '/')))
392 *table = '_';
393
394 return error;
395}
396
397static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
398 int undo)
399{
400 int error = 0;
401
402 if (undo)
403 goto fail_trans;
404
405 error = gfs2_glock_nq_num(sdp,
406 GFS2_MOUNT_LOCK, glops: &gfs2_nondisk_glops,
407 LM_ST_EXCLUSIVE,
408 LM_FLAG_NOEXP | GL_NOCACHE | GL_NOPID,
409 gh: mount_gh);
410 if (error) {
411 fs_err(sdp, "can't acquire mount glock: %d\n", error);
412 goto fail;
413 }
414
415 error = gfs2_glock_nq_num(sdp,
416 GFS2_LIVE_LOCK, glops: &gfs2_nondisk_glops,
417 LM_ST_SHARED,
418 LM_FLAG_NOEXP | GL_EXACT | GL_NOPID,
419 gh: &sdp->sd_live_gh);
420 if (error) {
421 fs_err(sdp, "can't acquire live glock: %d\n", error);
422 goto fail_mount;
423 }
424
425 error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, glops: &gfs2_nondisk_glops,
426 create: CREATE, glp: &sdp->sd_rename_gl);
427 if (error) {
428 fs_err(sdp, "can't create rename glock: %d\n", error);
429 goto fail_live;
430 }
431
432 error = gfs2_glock_get(sdp, GFS2_FREEZE_LOCK, glops: &gfs2_freeze_glops,
433 create: CREATE, glp: &sdp->sd_freeze_gl);
434 if (error) {
435 fs_err(sdp, "can't create freeze glock: %d\n", error);
436 goto fail_rename;
437 }
438
439 return 0;
440
441fail_trans:
442 gfs2_glock_put(gl: sdp->sd_freeze_gl);
443fail_rename:
444 gfs2_glock_put(gl: sdp->sd_rename_gl);
445fail_live:
446 gfs2_glock_dq_uninit(gh: &sdp->sd_live_gh);
447fail_mount:
448 gfs2_glock_dq_uninit(gh: mount_gh);
449fail:
450 return error;
451}
452
453static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr,
454 u64 no_addr, const char *name)
455{
456 struct gfs2_sbd *sdp = sb->s_fs_info;
457 struct dentry *dentry;
458 struct inode *inode;
459
460 inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, no_formal_ino: 0,
461 GFS2_BLKST_FREE /* ignore */);
462 if (IS_ERR(ptr: inode)) {
463 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode));
464 return PTR_ERR(ptr: inode);
465 }
466 dentry = d_make_root(inode);
467 if (!dentry) {
468 fs_err(sdp, "can't alloc %s dentry\n", name);
469 return -ENOMEM;
470 }
471 *dptr = dentry;
472 return 0;
473}
474
475static int init_sb(struct gfs2_sbd *sdp, int silent)
476{
477 struct super_block *sb = sdp->sd_vfs;
478 struct gfs2_holder sb_gh;
479 u64 no_addr;
480 int ret;
481
482 ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, glops: &gfs2_meta_glops,
483 LM_ST_SHARED, flags: 0, gh: &sb_gh);
484 if (ret) {
485 fs_err(sdp, "can't acquire superblock glock: %d\n", ret);
486 return ret;
487 }
488
489 ret = gfs2_read_sb(sdp, silent);
490 if (ret) {
491 fs_err(sdp, "can't read superblock: %d\n", ret);
492 goto out;
493 }
494
495 switch(sdp->sd_sb.sb_fs_format) {
496 case GFS2_FS_FORMAT_MAX:
497 sb->s_xattr = gfs2_xattr_handlers_max;
498 break;
499
500 case GFS2_FS_FORMAT_MIN:
501 sb->s_xattr = gfs2_xattr_handlers_min;
502 break;
503
504 default:
505 BUG();
506 }
507
508 /* Set up the buffer cache and SB for real */
509 if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(bdev: sb->s_bdev)) {
510 ret = -EINVAL;
511 fs_err(sdp, "FS block size (%u) is too small for device "
512 "block size (%u)\n",
513 sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev));
514 goto out;
515 }
516 if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
517 ret = -EINVAL;
518 fs_err(sdp, "FS block size (%u) is too big for machine "
519 "page size (%u)\n",
520 sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
521 goto out;
522 }
523 sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
524
525 /* Get the root inode */
526 no_addr = sdp->sd_sb.sb_root_dir.no_addr;
527 ret = gfs2_lookup_root(sb, dptr: &sdp->sd_root_dir, no_addr, name: "root");
528 if (ret)
529 goto out;
530
531 /* Get the master inode */
532 no_addr = sdp->sd_sb.sb_master_dir.no_addr;
533 ret = gfs2_lookup_root(sb, dptr: &sdp->sd_master_dir, no_addr, name: "master");
534 if (ret) {
535 dput(sdp->sd_root_dir);
536 goto out;
537 }
538 sb->s_root = dget(dentry: sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir);
539out:
540 gfs2_glock_dq_uninit(gh: &sb_gh);
541 return ret;
542}
543
544static void gfs2_others_may_mount(struct gfs2_sbd *sdp)
545{
546 char *message = "FIRSTMOUNT=Done";
547 char *envp[] = { message, NULL };
548
549 fs_info(sdp, "first mount done, others may mount\n");
550
551 if (sdp->sd_lockstruct.ls_ops->lm_first_done)
552 sdp->sd_lockstruct.ls_ops->lm_first_done(sdp);
553
554 kobject_uevent_env(kobj: &sdp->sd_kobj, action: KOBJ_CHANGE, envp);
555}
556
557/**
558 * gfs2_jindex_hold - Grab a lock on the jindex
559 * @sdp: The GFS2 superblock
560 * @ji_gh: the holder for the jindex glock
561 *
562 * Returns: errno
563 */
564
565static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
566{
567 struct gfs2_inode *dip = GFS2_I(inode: sdp->sd_jindex);
568 struct qstr name;
569 char buf[20];
570 struct gfs2_jdesc *jd;
571 int error;
572
573 name.name = buf;
574
575 mutex_lock(&sdp->sd_jindex_mutex);
576
577 for (;;) {
578 struct gfs2_inode *jip;
579
580 error = gfs2_glock_nq_init(gl: dip->i_gl, LM_ST_SHARED, flags: 0, gh: ji_gh);
581 if (error)
582 break;
583
584 name.len = sprintf(buf, fmt: "journal%u", sdp->sd_journals);
585 name.hash = gfs2_disk_hash(data: name.name, len: name.len);
586
587 error = gfs2_dir_check(dir: sdp->sd_jindex, filename: &name, NULL);
588 if (error == -ENOENT) {
589 error = 0;
590 break;
591 }
592
593 gfs2_glock_dq_uninit(gh: ji_gh);
594
595 if (error)
596 break;
597
598 error = -ENOMEM;
599 jd = kzalloc(size: sizeof(struct gfs2_jdesc), GFP_KERNEL);
600 if (!jd)
601 break;
602
603 INIT_LIST_HEAD(list: &jd->extent_list);
604 INIT_LIST_HEAD(list: &jd->jd_revoke_list);
605
606 INIT_WORK(&jd->jd_work, gfs2_recover_func);
607 jd->jd_inode = gfs2_lookupi(dir: sdp->sd_jindex, name: &name, is_root: 1);
608 if (IS_ERR_OR_NULL(ptr: jd->jd_inode)) {
609 if (!jd->jd_inode)
610 error = -ENOENT;
611 else
612 error = PTR_ERR(ptr: jd->jd_inode);
613 kfree(objp: jd);
614 break;
615 }
616
617 d_mark_dontcache(inode: jd->jd_inode);
618 spin_lock(lock: &sdp->sd_jindex_spin);
619 jd->jd_jid = sdp->sd_journals++;
620 jip = GFS2_I(inode: jd->jd_inode);
621 jd->jd_no_addr = jip->i_no_addr;
622 list_add_tail(new: &jd->jd_list, head: &sdp->sd_jindex_list);
623 spin_unlock(lock: &sdp->sd_jindex_spin);
624 }
625
626 mutex_unlock(lock: &sdp->sd_jindex_mutex);
627
628 return error;
629}
630
631/**
632 * init_statfs - look up and initialize master and local (per node) statfs inodes
633 * @sdp: The GFS2 superblock
634 *
635 * This should be called after the jindex is initialized in init_journal() and
636 * before gfs2_journal_recovery() is called because we need to be able to write
637 * to these inodes during recovery.
638 *
639 * Returns: errno
640 */
641static int init_statfs(struct gfs2_sbd *sdp)
642{
643 int error = 0;
644 struct inode *master = d_inode(dentry: sdp->sd_master_dir);
645 struct inode *pn = NULL;
646 char buf[30];
647 struct gfs2_jdesc *jd;
648 struct gfs2_inode *ip;
649
650 sdp->sd_statfs_inode = gfs2_lookup_meta(dip: master, name: "statfs");
651 if (IS_ERR(ptr: sdp->sd_statfs_inode)) {
652 error = PTR_ERR(ptr: sdp->sd_statfs_inode);
653 fs_err(sdp, "can't read in statfs inode: %d\n", error);
654 goto out;
655 }
656 if (sdp->sd_args.ar_spectator)
657 goto out;
658
659 pn = gfs2_lookup_meta(dip: master, name: "per_node");
660 if (IS_ERR(ptr: pn)) {
661 error = PTR_ERR(ptr: pn);
662 fs_err(sdp, "can't find per_node directory: %d\n", error);
663 goto put_statfs;
664 }
665
666 /* For each jid, lookup the corresponding local statfs inode in the
667 * per_node metafs directory and save it in the sdp->sd_sc_inodes_list. */
668 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
669 struct local_statfs_inode *lsi =
670 kmalloc(size: sizeof(struct local_statfs_inode), GFP_NOFS);
671 if (!lsi) {
672 error = -ENOMEM;
673 goto free_local;
674 }
675 sprintf(buf, fmt: "statfs_change%u", jd->jd_jid);
676 lsi->si_sc_inode = gfs2_lookup_meta(dip: pn, name: buf);
677 if (IS_ERR(ptr: lsi->si_sc_inode)) {
678 error = PTR_ERR(ptr: lsi->si_sc_inode);
679 fs_err(sdp, "can't find local \"sc\" file#%u: %d\n",
680 jd->jd_jid, error);
681 kfree(objp: lsi);
682 goto free_local;
683 }
684 lsi->si_jid = jd->jd_jid;
685 if (jd->jd_jid == sdp->sd_jdesc->jd_jid)
686 sdp->sd_sc_inode = lsi->si_sc_inode;
687
688 list_add_tail(new: &lsi->si_list, head: &sdp->sd_sc_inodes_list);
689 }
690
691 iput(pn);
692 pn = NULL;
693 ip = GFS2_I(inode: sdp->sd_sc_inode);
694 error = gfs2_glock_nq_init(gl: ip->i_gl, LM_ST_EXCLUSIVE, GL_NOPID,
695 gh: &sdp->sd_sc_gh);
696 if (error) {
697 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
698 goto free_local;
699 }
700 /* read in the local statfs buffer - other nodes don't change it. */
701 error = gfs2_meta_inode_buffer(ip, bhp: &sdp->sd_sc_bh);
702 if (error) {
703 fs_err(sdp, "Cannot read in local statfs: %d\n", error);
704 goto unlock_sd_gh;
705 }
706 return 0;
707
708unlock_sd_gh:
709 gfs2_glock_dq_uninit(gh: &sdp->sd_sc_gh);
710free_local:
711 free_local_statfs_inodes(sdp);
712 iput(pn);
713put_statfs:
714 iput(sdp->sd_statfs_inode);
715out:
716 return error;
717}
718
719/* Uninitialize and free up memory used by the list of statfs inodes */
720static void uninit_statfs(struct gfs2_sbd *sdp)
721{
722 if (!sdp->sd_args.ar_spectator) {
723 brelse(bh: sdp->sd_sc_bh);
724 gfs2_glock_dq_uninit(gh: &sdp->sd_sc_gh);
725 free_local_statfs_inodes(sdp);
726 }
727 iput(sdp->sd_statfs_inode);
728}
729
730static int init_journal(struct gfs2_sbd *sdp, int undo)
731{
732 struct inode *master = d_inode(dentry: sdp->sd_master_dir);
733 struct gfs2_holder ji_gh;
734 struct gfs2_inode *ip;
735 int error = 0;
736
737 gfs2_holder_mark_uninitialized(gh: &ji_gh);
738 if (undo)
739 goto fail_statfs;
740
741 sdp->sd_jindex = gfs2_lookup_meta(dip: master, name: "jindex");
742 if (IS_ERR(ptr: sdp->sd_jindex)) {
743 fs_err(sdp, "can't lookup journal index: %d\n", error);
744 return PTR_ERR(ptr: sdp->sd_jindex);
745 }
746
747 /* Load in the journal index special file */
748
749 error = gfs2_jindex_hold(sdp, ji_gh: &ji_gh);
750 if (error) {
751 fs_err(sdp, "can't read journal index: %d\n", error);
752 goto fail;
753 }
754
755 error = -EUSERS;
756 if (!gfs2_jindex_size(sdp)) {
757 fs_err(sdp, "no journals!\n");
758 goto fail_jindex;
759 }
760
761 atomic_set(v: &sdp->sd_log_blks_needed, i: 0);
762 if (sdp->sd_args.ar_spectator) {
763 sdp->sd_jdesc = gfs2_jdesc_find(sdp, jid: 0);
764 atomic_set(v: &sdp->sd_log_blks_free, i: sdp->sd_jdesc->jd_blocks);
765 atomic_set(v: &sdp->sd_log_thresh1, i: 2*sdp->sd_jdesc->jd_blocks/5);
766 atomic_set(v: &sdp->sd_log_thresh2, i: 4*sdp->sd_jdesc->jd_blocks/5);
767 } else {
768 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
769 fs_err(sdp, "can't mount journal #%u\n",
770 sdp->sd_lockstruct.ls_jid);
771 fs_err(sdp, "there are only %u journals (0 - %u)\n",
772 gfs2_jindex_size(sdp),
773 gfs2_jindex_size(sdp) - 1);
774 goto fail_jindex;
775 }
776 sdp->sd_jdesc = gfs2_jdesc_find(sdp, jid: sdp->sd_lockstruct.ls_jid);
777
778 error = gfs2_glock_nq_num(sdp, number: sdp->sd_lockstruct.ls_jid,
779 glops: &gfs2_journal_glops,
780 LM_ST_EXCLUSIVE,
781 LM_FLAG_NOEXP | GL_NOCACHE | GL_NOPID,
782 gh: &sdp->sd_journal_gh);
783 if (error) {
784 fs_err(sdp, "can't acquire journal glock: %d\n", error);
785 goto fail_jindex;
786 }
787
788 ip = GFS2_I(inode: sdp->sd_jdesc->jd_inode);
789 sdp->sd_jinode_gl = ip->i_gl;
790 error = gfs2_glock_nq_init(gl: ip->i_gl, LM_ST_SHARED,
791 LM_FLAG_NOEXP | GL_EXACT |
792 GL_NOCACHE | GL_NOPID,
793 gh: &sdp->sd_jinode_gh);
794 if (error) {
795 fs_err(sdp, "can't acquire journal inode glock: %d\n",
796 error);
797 goto fail_journal_gh;
798 }
799
800 error = gfs2_jdesc_check(jd: sdp->sd_jdesc);
801 if (error) {
802 fs_err(sdp, "my journal (%u) is bad: %d\n",
803 sdp->sd_jdesc->jd_jid, error);
804 goto fail_jinode_gh;
805 }
806 atomic_set(v: &sdp->sd_log_blks_free, i: sdp->sd_jdesc->jd_blocks);
807 atomic_set(v: &sdp->sd_log_thresh1, i: 2*sdp->sd_jdesc->jd_blocks/5);
808 atomic_set(v: &sdp->sd_log_thresh2, i: 4*sdp->sd_jdesc->jd_blocks/5);
809
810 /* Map the extents for this journal's blocks */
811 gfs2_map_journal_extents(sdp, jd: sdp->sd_jdesc);
812 }
813 trace_gfs2_log_blocks(sdp, blocks: atomic_read(v: &sdp->sd_log_blks_free));
814
815 /* Lookup statfs inodes here so journal recovery can use them. */
816 error = init_statfs(sdp);
817 if (error)
818 goto fail_jinode_gh;
819
820 if (sdp->sd_lockstruct.ls_first) {
821 unsigned int x;
822 for (x = 0; x < sdp->sd_journals; x++) {
823 struct gfs2_jdesc *jd = gfs2_jdesc_find(sdp, jid: x);
824
825 if (sdp->sd_args.ar_spectator) {
826 error = check_journal_clean(sdp, jd, verbose: true);
827 if (error)
828 goto fail_statfs;
829 continue;
830 }
831 error = gfs2_recover_journal(gfs2_jd: jd, wait: true);
832 if (error) {
833 fs_err(sdp, "error recovering journal %u: %d\n",
834 x, error);
835 goto fail_statfs;
836 }
837 }
838
839 gfs2_others_may_mount(sdp);
840 } else if (!sdp->sd_args.ar_spectator) {
841 error = gfs2_recover_journal(gfs2_jd: sdp->sd_jdesc, wait: true);
842 if (error) {
843 fs_err(sdp, "error recovering my journal: %d\n", error);
844 goto fail_statfs;
845 }
846 }
847
848 sdp->sd_log_idle = 1;
849 set_bit(nr: SDF_JOURNAL_CHECKED, addr: &sdp->sd_flags);
850 gfs2_glock_dq_uninit(gh: &ji_gh);
851 INIT_WORK(&sdp->sd_freeze_work, gfs2_freeze_func);
852 return 0;
853
854fail_statfs:
855 uninit_statfs(sdp);
856fail_jinode_gh:
857 /* A withdraw may have done dq/uninit so now we need to check it */
858 if (!sdp->sd_args.ar_spectator &&
859 gfs2_holder_initialized(gh: &sdp->sd_jinode_gh))
860 gfs2_glock_dq_uninit(gh: &sdp->sd_jinode_gh);
861fail_journal_gh:
862 if (!sdp->sd_args.ar_spectator &&
863 gfs2_holder_initialized(gh: &sdp->sd_journal_gh))
864 gfs2_glock_dq_uninit(gh: &sdp->sd_journal_gh);
865fail_jindex:
866 gfs2_jindex_free(sdp);
867 if (gfs2_holder_initialized(gh: &ji_gh))
868 gfs2_glock_dq_uninit(gh: &ji_gh);
869fail:
870 iput(sdp->sd_jindex);
871 return error;
872}
873
874static struct lock_class_key gfs2_quota_imutex_key;
875
876static int init_inodes(struct gfs2_sbd *sdp, int undo)
877{
878 int error = 0;
879 struct inode *master = d_inode(dentry: sdp->sd_master_dir);
880
881 if (undo)
882 goto fail_qinode;
883
884 error = init_journal(sdp, undo);
885 complete_all(&sdp->sd_journal_ready);
886 if (error)
887 goto fail;
888
889 /* Read in the resource index inode */
890 sdp->sd_rindex = gfs2_lookup_meta(dip: master, name: "rindex");
891 if (IS_ERR(ptr: sdp->sd_rindex)) {
892 error = PTR_ERR(ptr: sdp->sd_rindex);
893 fs_err(sdp, "can't get resource index inode: %d\n", error);
894 goto fail_journal;
895 }
896 sdp->sd_rindex_uptodate = 0;
897
898 /* Read in the quota inode */
899 sdp->sd_quota_inode = gfs2_lookup_meta(dip: master, name: "quota");
900 if (IS_ERR(ptr: sdp->sd_quota_inode)) {
901 error = PTR_ERR(ptr: sdp->sd_quota_inode);
902 fs_err(sdp, "can't get quota file inode: %d\n", error);
903 goto fail_rindex;
904 }
905 /*
906 * i_rwsem on quota files is special. Since this inode is hidden system
907 * file, we are safe to define locking ourselves.
908 */
909 lockdep_set_class(&sdp->sd_quota_inode->i_rwsem,
910 &gfs2_quota_imutex_key);
911
912 error = gfs2_rindex_update(sdp);
913 if (error)
914 goto fail_qinode;
915
916 return 0;
917
918fail_qinode:
919 iput(sdp->sd_quota_inode);
920fail_rindex:
921 gfs2_clear_rgrpd(sdp);
922 iput(sdp->sd_rindex);
923fail_journal:
924 init_journal(sdp, UNDO);
925fail:
926 return error;
927}
928
929static int init_per_node(struct gfs2_sbd *sdp, int undo)
930{
931 struct inode *pn = NULL;
932 char buf[30];
933 int error = 0;
934 struct gfs2_inode *ip;
935 struct inode *master = d_inode(dentry: sdp->sd_master_dir);
936
937 if (sdp->sd_args.ar_spectator)
938 return 0;
939
940 if (undo)
941 goto fail_qc_gh;
942
943 pn = gfs2_lookup_meta(dip: master, name: "per_node");
944 if (IS_ERR(ptr: pn)) {
945 error = PTR_ERR(ptr: pn);
946 fs_err(sdp, "can't find per_node directory: %d\n", error);
947 return error;
948 }
949
950 sprintf(buf, fmt: "quota_change%u", sdp->sd_jdesc->jd_jid);
951 sdp->sd_qc_inode = gfs2_lookup_meta(dip: pn, name: buf);
952 if (IS_ERR(ptr: sdp->sd_qc_inode)) {
953 error = PTR_ERR(ptr: sdp->sd_qc_inode);
954 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
955 goto fail_ut_i;
956 }
957
958 iput(pn);
959 pn = NULL;
960
961 ip = GFS2_I(inode: sdp->sd_qc_inode);
962 error = gfs2_glock_nq_init(gl: ip->i_gl, LM_ST_EXCLUSIVE, GL_NOPID,
963 gh: &sdp->sd_qc_gh);
964 if (error) {
965 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
966 goto fail_qc_i;
967 }
968
969 return 0;
970
971fail_qc_gh:
972 gfs2_glock_dq_uninit(gh: &sdp->sd_qc_gh);
973fail_qc_i:
974 iput(sdp->sd_qc_inode);
975fail_ut_i:
976 iput(pn);
977 return error;
978}
979
980static const match_table_t nolock_tokens = {
981 { Opt_jid, "jid=%d", },
982 { Opt_err, NULL },
983};
984
985static const struct lm_lockops nolock_ops = {
986 .lm_proto_name = "lock_nolock",
987 .lm_put_lock = gfs2_glock_free,
988 .lm_tokens = &nolock_tokens,
989};
990
991/**
992 * gfs2_lm_mount - mount a locking protocol
993 * @sdp: the filesystem
994 * @silent: if 1, don't complain if the FS isn't a GFS2 fs
995 *
996 * Returns: errno
997 */
998
999static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
1000{
1001 const struct lm_lockops *lm;
1002 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
1003 struct gfs2_args *args = &sdp->sd_args;
1004 const char *proto = sdp->sd_proto_name;
1005 const char *table = sdp->sd_table_name;
1006 char *o, *options;
1007 int ret;
1008
1009 if (!strcmp("lock_nolock", proto)) {
1010 lm = &nolock_ops;
1011 sdp->sd_args.ar_localflocks = 1;
1012#ifdef CONFIG_GFS2_FS_LOCKING_DLM
1013 } else if (!strcmp("lock_dlm", proto)) {
1014 lm = &gfs2_dlm_ops;
1015#endif
1016 } else {
1017 pr_info("can't find protocol %s\n", proto);
1018 return -ENOENT;
1019 }
1020
1021 fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);
1022
1023 ls->ls_ops = lm;
1024 ls->ls_first = 1;
1025
1026 for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) {
1027 substring_t tmp[MAX_OPT_ARGS];
1028 int token, option;
1029
1030 if (!o || !*o)
1031 continue;
1032
1033 token = match_token(o, table: *lm->lm_tokens, args: tmp);
1034 switch (token) {
1035 case Opt_jid:
1036 ret = match_int(&tmp[0], result: &option);
1037 if (ret || option < 0)
1038 goto hostdata_error;
1039 if (test_and_clear_bit(nr: SDF_NOJOURNALID, addr: &sdp->sd_flags))
1040 ls->ls_jid = option;
1041 break;
1042 case Opt_id:
1043 case Opt_nodir:
1044 /* Obsolete, but left for backward compat purposes */
1045 break;
1046 case Opt_first:
1047 ret = match_int(&tmp[0], result: &option);
1048 if (ret || (option != 0 && option != 1))
1049 goto hostdata_error;
1050 ls->ls_first = option;
1051 break;
1052 case Opt_err:
1053 default:
1054hostdata_error:
1055 fs_info(sdp, "unknown hostdata (%s)\n", o);
1056 return -EINVAL;
1057 }
1058 }
1059
1060 if (lm->lm_mount == NULL) {
1061 fs_info(sdp, "Now mounting FS (format %u)...\n", sdp->sd_sb.sb_fs_format);
1062 complete_all(&sdp->sd_locking_init);
1063 return 0;
1064 }
1065 ret = lm->lm_mount(sdp, table);
1066 if (ret == 0)
1067 fs_info(sdp, "Joined cluster. Now mounting FS (format %u)...\n",
1068 sdp->sd_sb.sb_fs_format);
1069 complete_all(&sdp->sd_locking_init);
1070 return ret;
1071}
1072
1073void gfs2_lm_unmount(struct gfs2_sbd *sdp)
1074{
1075 const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops;
1076 if (!gfs2_withdrawing_or_withdrawn(sdp) && lm->lm_unmount)
1077 lm->lm_unmount(sdp);
1078}
1079
1080static int wait_on_journal(struct gfs2_sbd *sdp)
1081{
1082 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
1083 return 0;
1084
1085 return wait_on_bit(word: &sdp->sd_flags, bit: SDF_NOJOURNALID, TASK_INTERRUPTIBLE)
1086 ? -EINTR : 0;
1087}
1088
1089void gfs2_online_uevent(struct gfs2_sbd *sdp)
1090{
1091 struct super_block *sb = sdp->sd_vfs;
1092 char ro[20];
1093 char spectator[20];
1094 char *envp[] = { ro, spectator, NULL };
1095 sprintf(buf: ro, fmt: "RDONLY=%d", sb_rdonly(sb));
1096 sprintf(buf: spectator, fmt: "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
1097 kobject_uevent_env(kobj: &sdp->sd_kobj, action: KOBJ_ONLINE, envp);
1098}
1099
1100static int init_threads(struct gfs2_sbd *sdp)
1101{
1102 struct task_struct *p;
1103 int error = 0;
1104
1105 p = kthread_create(gfs2_logd, sdp, "gfs2_logd/%s", sdp->sd_fsname);
1106 if (IS_ERR(ptr: p)) {
1107 error = PTR_ERR(ptr: p);
1108 fs_err(sdp, "can't create logd thread: %d\n", error);
1109 return error;
1110 }
1111 get_task_struct(t: p);
1112 sdp->sd_logd_process = p;
1113
1114 p = kthread_create(gfs2_quotad, sdp, "gfs2_quotad/%s", sdp->sd_fsname);
1115 if (IS_ERR(ptr: p)) {
1116 error = PTR_ERR(ptr: p);
1117 fs_err(sdp, "can't create quotad thread: %d\n", error);
1118 goto fail;
1119 }
1120 get_task_struct(t: p);
1121 sdp->sd_quotad_process = p;
1122
1123 wake_up_process(tsk: sdp->sd_logd_process);
1124 wake_up_process(tsk: sdp->sd_quotad_process);
1125 return 0;
1126
1127fail:
1128 kthread_stop_put(k: sdp->sd_logd_process);
1129 sdp->sd_logd_process = NULL;
1130 return error;
1131}
1132
1133void gfs2_destroy_threads(struct gfs2_sbd *sdp)
1134{
1135 if (sdp->sd_logd_process) {
1136 kthread_stop_put(k: sdp->sd_logd_process);
1137 sdp->sd_logd_process = NULL;
1138 }
1139 if (sdp->sd_quotad_process) {
1140 kthread_stop_put(k: sdp->sd_quotad_process);
1141 sdp->sd_quotad_process = NULL;
1142 }
1143}
1144
1145/**
1146 * gfs2_fill_super - Read in superblock
1147 * @sb: The VFS superblock
1148 * @fc: Mount options and flags
1149 *
1150 * Returns: -errno
1151 */
1152static int gfs2_fill_super(struct super_block *sb, struct fs_context *fc)
1153{
1154 struct gfs2_args *args = fc->fs_private;
1155 int silent = fc->sb_flags & SB_SILENT;
1156 struct gfs2_sbd *sdp;
1157 struct gfs2_holder mount_gh;
1158 int error;
1159
1160 sdp = init_sbd(sb);
1161 if (!sdp) {
1162 pr_warn("can't alloc struct gfs2_sbd\n");
1163 return -ENOMEM;
1164 }
1165 sdp->sd_args = *args;
1166
1167 if (sdp->sd_args.ar_spectator) {
1168 sb->s_flags |= SB_RDONLY;
1169 set_bit(nr: SDF_RORECOVERY, addr: &sdp->sd_flags);
1170 }
1171 if (sdp->sd_args.ar_posix_acl)
1172 sb->s_flags |= SB_POSIXACL;
1173 if (sdp->sd_args.ar_nobarrier)
1174 set_bit(nr: SDF_NOBARRIERS, addr: &sdp->sd_flags);
1175
1176 sb->s_flags |= SB_NOSEC;
1177 sb->s_magic = GFS2_MAGIC;
1178 sb->s_op = &gfs2_super_ops;
1179 sb->s_d_op = &gfs2_dops;
1180 sb->s_export_op = &gfs2_export_ops;
1181 sb->s_qcop = &gfs2_quotactl_ops;
1182 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1183 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
1184 sb->s_time_gran = 1;
1185 sb->s_maxbytes = MAX_LFS_FILESIZE;
1186
1187 /* Set up the buffer cache and fill in some fake block size values
1188 to allow us to read-in the on-disk superblock. */
1189 sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, 512);
1190 sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
1191 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift - 9;
1192 sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift);
1193
1194 sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit;
1195 sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum;
1196 if (sdp->sd_args.ar_statfs_quantum) {
1197 sdp->sd_tune.gt_statfs_slow = 0;
1198 sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum;
1199 } else {
1200 sdp->sd_tune.gt_statfs_slow = 1;
1201 sdp->sd_tune.gt_statfs_quantum = 30;
1202 }
1203
1204 error = init_names(sdp, silent);
1205 if (error)
1206 goto fail_free;
1207
1208 snprintf(buf: sdp->sd_fsname, size: sizeof(sdp->sd_fsname), fmt: "%s", sdp->sd_table_name);
1209
1210 sdp->sd_delete_wq = alloc_workqueue(fmt: "gfs2-delete/%s",
1211 flags: WQ_MEM_RECLAIM | WQ_FREEZABLE, max_active: 0, sdp->sd_fsname);
1212 error = -ENOMEM;
1213 if (!sdp->sd_delete_wq)
1214 goto fail_free;
1215
1216 error = gfs2_sys_fs_add(sdp);
1217 if (error)
1218 goto fail_delete_wq;
1219
1220 gfs2_create_debugfs_file(sdp);
1221
1222 error = gfs2_lm_mount(sdp, silent);
1223 if (error)
1224 goto fail_debug;
1225
1226 error = init_locking(sdp, mount_gh: &mount_gh, DO);
1227 if (error)
1228 goto fail_lm;
1229
1230 error = init_sb(sdp, silent);
1231 if (error)
1232 goto fail_locking;
1233
1234 /* Turn rgrplvb on by default if fs format is recent enough */
1235 if (!sdp->sd_args.ar_got_rgrplvb && sdp->sd_sb.sb_fs_format > 1801)
1236 sdp->sd_args.ar_rgrplvb = 1;
1237
1238 error = wait_on_journal(sdp);
1239 if (error)
1240 goto fail_sb;
1241
1242 /*
1243 * If user space has failed to join the cluster or some similar
1244 * failure has occurred, then the journal id will contain a
1245 * negative (error) number. This will then be returned to the
1246 * caller (of the mount syscall). We do this even for spectator
1247 * mounts (which just write a jid of 0 to indicate "ok" even though
1248 * the jid is unused in the spectator case)
1249 */
1250 if (sdp->sd_lockstruct.ls_jid < 0) {
1251 error = sdp->sd_lockstruct.ls_jid;
1252 sdp->sd_lockstruct.ls_jid = 0;
1253 goto fail_sb;
1254 }
1255
1256 if (sdp->sd_args.ar_spectator)
1257 snprintf(buf: sdp->sd_fsname, size: sizeof(sdp->sd_fsname), fmt: "%s.s",
1258 sdp->sd_table_name);
1259 else
1260 snprintf(buf: sdp->sd_fsname, size: sizeof(sdp->sd_fsname), fmt: "%s.%u",
1261 sdp->sd_table_name, sdp->sd_lockstruct.ls_jid);
1262
1263 error = init_inodes(sdp, DO);
1264 if (error)
1265 goto fail_sb;
1266
1267 error = init_per_node(sdp, DO);
1268 if (error)
1269 goto fail_inodes;
1270
1271 error = gfs2_statfs_init(sdp);
1272 if (error) {
1273 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
1274 goto fail_per_node;
1275 }
1276
1277 if (!sb_rdonly(sb)) {
1278 error = init_threads(sdp);
1279 if (error)
1280 goto fail_per_node;
1281 }
1282
1283 error = gfs2_freeze_lock_shared(sdp);
1284 if (error)
1285 goto fail_per_node;
1286
1287 if (!sb_rdonly(sb))
1288 error = gfs2_make_fs_rw(sdp);
1289
1290 if (error) {
1291 gfs2_freeze_unlock(freeze_gh: &sdp->sd_freeze_gh);
1292 gfs2_destroy_threads(sdp);
1293 fs_err(sdp, "can't make FS RW: %d\n", error);
1294 goto fail_per_node;
1295 }
1296 gfs2_glock_dq_uninit(gh: &mount_gh);
1297 gfs2_online_uevent(sdp);
1298 return 0;
1299
1300fail_per_node:
1301 init_per_node(sdp, UNDO);
1302fail_inodes:
1303 init_inodes(sdp, UNDO);
1304fail_sb:
1305 if (sdp->sd_root_dir)
1306 dput(sdp->sd_root_dir);
1307 if (sdp->sd_master_dir)
1308 dput(sdp->sd_master_dir);
1309 if (sb->s_root)
1310 dput(sb->s_root);
1311 sb->s_root = NULL;
1312fail_locking:
1313 init_locking(sdp, mount_gh: &mount_gh, UNDO);
1314fail_lm:
1315 complete_all(&sdp->sd_journal_ready);
1316 gfs2_gl_hash_clear(sdp);
1317 gfs2_lm_unmount(sdp);
1318fail_debug:
1319 gfs2_delete_debugfs_file(sdp);
1320 gfs2_sys_fs_del(sdp);
1321fail_delete_wq:
1322 destroy_workqueue(wq: sdp->sd_delete_wq);
1323fail_free:
1324 free_sbd(sdp);
1325 sb->s_fs_info = NULL;
1326 return error;
1327}
1328
1329/**
1330 * gfs2_get_tree - Get the GFS2 superblock and root directory
1331 * @fc: The filesystem context
1332 *
1333 * Returns: 0 or -errno on error
1334 */
1335static int gfs2_get_tree(struct fs_context *fc)
1336{
1337 struct gfs2_args *args = fc->fs_private;
1338 struct gfs2_sbd *sdp;
1339 int error;
1340
1341 error = get_tree_bdev(fc, fill_super: gfs2_fill_super);
1342 if (error)
1343 return error;
1344
1345 sdp = fc->root->d_sb->s_fs_info;
1346 dput(fc->root);
1347 if (args->ar_meta)
1348 fc->root = dget(dentry: sdp->sd_master_dir);
1349 else
1350 fc->root = dget(dentry: sdp->sd_root_dir);
1351 return 0;
1352}
1353
1354static void gfs2_fc_free(struct fs_context *fc)
1355{
1356 struct gfs2_args *args = fc->fs_private;
1357
1358 kfree(objp: args);
1359}
1360
1361enum gfs2_param {
1362 Opt_lockproto,
1363 Opt_locktable,
1364 Opt_hostdata,
1365 Opt_spectator,
1366 Opt_ignore_local_fs,
1367 Opt_localflocks,
1368 Opt_localcaching,
1369 Opt_debug,
1370 Opt_upgrade,
1371 Opt_acl,
1372 Opt_quota,
1373 Opt_quota_flag,
1374 Opt_suiddir,
1375 Opt_data,
1376 Opt_meta,
1377 Opt_discard,
1378 Opt_commit,
1379 Opt_errors,
1380 Opt_statfs_quantum,
1381 Opt_statfs_percent,
1382 Opt_quota_quantum,
1383 Opt_barrier,
1384 Opt_rgrplvb,
1385 Opt_loccookie,
1386};
1387
1388static const struct constant_table gfs2_param_quota[] = {
1389 {"off", GFS2_QUOTA_OFF},
1390 {"account", GFS2_QUOTA_ACCOUNT},
1391 {"on", GFS2_QUOTA_ON},
1392 {"quiet", GFS2_QUOTA_QUIET},
1393 {}
1394};
1395
1396enum opt_data {
1397 Opt_data_writeback = GFS2_DATA_WRITEBACK,
1398 Opt_data_ordered = GFS2_DATA_ORDERED,
1399};
1400
1401static const struct constant_table gfs2_param_data[] = {
1402 {"writeback", Opt_data_writeback },
1403 {"ordered", Opt_data_ordered },
1404 {}
1405};
1406
1407enum opt_errors {
1408 Opt_errors_withdraw = GFS2_ERRORS_WITHDRAW,
1409 Opt_errors_panic = GFS2_ERRORS_PANIC,
1410};
1411
1412static const struct constant_table gfs2_param_errors[] = {
1413 {"withdraw", Opt_errors_withdraw },
1414 {"panic", Opt_errors_panic },
1415 {}
1416};
1417
1418static const struct fs_parameter_spec gfs2_fs_parameters[] = {
1419 fsparam_string ("lockproto", Opt_lockproto),
1420 fsparam_string ("locktable", Opt_locktable),
1421 fsparam_string ("hostdata", Opt_hostdata),
1422 fsparam_flag ("spectator", Opt_spectator),
1423 fsparam_flag ("norecovery", Opt_spectator),
1424 fsparam_flag ("ignore_local_fs", Opt_ignore_local_fs),
1425 fsparam_flag ("localflocks", Opt_localflocks),
1426 fsparam_flag ("localcaching", Opt_localcaching),
1427 fsparam_flag_no("debug", Opt_debug),
1428 fsparam_flag ("upgrade", Opt_upgrade),
1429 fsparam_flag_no("acl", Opt_acl),
1430 fsparam_flag_no("suiddir", Opt_suiddir),
1431 fsparam_enum ("data", Opt_data, gfs2_param_data),
1432 fsparam_flag ("meta", Opt_meta),
1433 fsparam_flag_no("discard", Opt_discard),
1434 fsparam_s32 ("commit", Opt_commit),
1435 fsparam_enum ("errors", Opt_errors, gfs2_param_errors),
1436 fsparam_s32 ("statfs_quantum", Opt_statfs_quantum),
1437 fsparam_s32 ("statfs_percent", Opt_statfs_percent),
1438 fsparam_s32 ("quota_quantum", Opt_quota_quantum),
1439 fsparam_flag_no("barrier", Opt_barrier),
1440 fsparam_flag_no("rgrplvb", Opt_rgrplvb),
1441 fsparam_flag_no("loccookie", Opt_loccookie),
1442 /* quota can be a flag or an enum so it gets special treatment */
1443 fsparam_flag_no("quota", Opt_quota_flag),
1444 fsparam_enum("quota", Opt_quota, gfs2_param_quota),
1445 {}
1446};
1447
1448/* Parse a single mount parameter */
1449static int gfs2_parse_param(struct fs_context *fc, struct fs_parameter *param)
1450{
1451 struct gfs2_args *args = fc->fs_private;
1452 struct fs_parse_result result;
1453 int o;
1454
1455 o = fs_parse(fc, desc: gfs2_fs_parameters, param, result: &result);
1456 if (o < 0)
1457 return o;
1458
1459 switch (o) {
1460 case Opt_lockproto:
1461 strscpy(args->ar_lockproto, param->string, GFS2_LOCKNAME_LEN);
1462 break;
1463 case Opt_locktable:
1464 strscpy(args->ar_locktable, param->string, GFS2_LOCKNAME_LEN);
1465 break;
1466 case Opt_hostdata:
1467 strscpy(args->ar_hostdata, param->string, GFS2_LOCKNAME_LEN);
1468 break;
1469 case Opt_spectator:
1470 args->ar_spectator = 1;
1471 break;
1472 case Opt_ignore_local_fs:
1473 /* Retained for backwards compat only */
1474 break;
1475 case Opt_localflocks:
1476 args->ar_localflocks = 1;
1477 break;
1478 case Opt_localcaching:
1479 /* Retained for backwards compat only */
1480 break;
1481 case Opt_debug:
1482 if (result.boolean && args->ar_errors == GFS2_ERRORS_PANIC)
1483 return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive");
1484 args->ar_debug = result.boolean;
1485 break;
1486 case Opt_upgrade:
1487 /* Retained for backwards compat only */
1488 break;
1489 case Opt_acl:
1490 args->ar_posix_acl = result.boolean;
1491 break;
1492 case Opt_quota_flag:
1493 args->ar_quota = result.negated ? GFS2_QUOTA_OFF : GFS2_QUOTA_ON;
1494 break;
1495 case Opt_quota:
1496 args->ar_quota = result.int_32;
1497 break;
1498 case Opt_suiddir:
1499 args->ar_suiddir = result.boolean;
1500 break;
1501 case Opt_data:
1502 /* The uint_32 result maps directly to GFS2_DATA_* */
1503 args->ar_data = result.uint_32;
1504 break;
1505 case Opt_meta:
1506 args->ar_meta = 1;
1507 break;
1508 case Opt_discard:
1509 args->ar_discard = result.boolean;
1510 break;
1511 case Opt_commit:
1512 if (result.int_32 <= 0)
1513 return invalfc(fc, "commit mount option requires a positive numeric argument");
1514 args->ar_commit = result.int_32;
1515 break;
1516 case Opt_statfs_quantum:
1517 if (result.int_32 < 0)
1518 return invalfc(fc, "statfs_quantum mount option requires a non-negative numeric argument");
1519 args->ar_statfs_quantum = result.int_32;
1520 break;
1521 case Opt_quota_quantum:
1522 if (result.int_32 <= 0)
1523 return invalfc(fc, "quota_quantum mount option requires a positive numeric argument");
1524 args->ar_quota_quantum = result.int_32;
1525 break;
1526 case Opt_statfs_percent:
1527 if (result.int_32 < 0 || result.int_32 > 100)
1528 return invalfc(fc, "statfs_percent mount option requires a numeric argument between 0 and 100");
1529 args->ar_statfs_percent = result.int_32;
1530 break;
1531 case Opt_errors:
1532 if (args->ar_debug && result.uint_32 == GFS2_ERRORS_PANIC)
1533 return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive");
1534 args->ar_errors = result.uint_32;
1535 break;
1536 case Opt_barrier:
1537 args->ar_nobarrier = result.boolean;
1538 break;
1539 case Opt_rgrplvb:
1540 args->ar_rgrplvb = result.boolean;
1541 args->ar_got_rgrplvb = 1;
1542 break;
1543 case Opt_loccookie:
1544 args->ar_loccookie = result.boolean;
1545 break;
1546 default:
1547 return invalfc(fc, "invalid mount option: %s", param->key);
1548 }
1549 return 0;
1550}
1551
1552static int gfs2_reconfigure(struct fs_context *fc)
1553{
1554 struct super_block *sb = fc->root->d_sb;
1555 struct gfs2_sbd *sdp = sb->s_fs_info;
1556 struct gfs2_args *oldargs = &sdp->sd_args;
1557 struct gfs2_args *newargs = fc->fs_private;
1558 struct gfs2_tune *gt = &sdp->sd_tune;
1559 int error = 0;
1560
1561 sync_filesystem(sb);
1562
1563 spin_lock(lock: &gt->gt_spin);
1564 oldargs->ar_commit = gt->gt_logd_secs;
1565 oldargs->ar_quota_quantum = gt->gt_quota_quantum;
1566 if (gt->gt_statfs_slow)
1567 oldargs->ar_statfs_quantum = 0;
1568 else
1569 oldargs->ar_statfs_quantum = gt->gt_statfs_quantum;
1570 spin_unlock(lock: &gt->gt_spin);
1571
1572 if (strcmp(newargs->ar_lockproto, oldargs->ar_lockproto)) {
1573 errorfc(fc, "reconfiguration of locking protocol not allowed");
1574 return -EINVAL;
1575 }
1576 if (strcmp(newargs->ar_locktable, oldargs->ar_locktable)) {
1577 errorfc(fc, "reconfiguration of lock table not allowed");
1578 return -EINVAL;
1579 }
1580 if (strcmp(newargs->ar_hostdata, oldargs->ar_hostdata)) {
1581 errorfc(fc, "reconfiguration of host data not allowed");
1582 return -EINVAL;
1583 }
1584 if (newargs->ar_spectator != oldargs->ar_spectator) {
1585 errorfc(fc, "reconfiguration of spectator mode not allowed");
1586 return -EINVAL;
1587 }
1588 if (newargs->ar_localflocks != oldargs->ar_localflocks) {
1589 errorfc(fc, "reconfiguration of localflocks not allowed");
1590 return -EINVAL;
1591 }
1592 if (newargs->ar_meta != oldargs->ar_meta) {
1593 errorfc(fc, "switching between gfs2 and gfs2meta not allowed");
1594 return -EINVAL;
1595 }
1596 if (oldargs->ar_spectator)
1597 fc->sb_flags |= SB_RDONLY;
1598
1599 if ((sb->s_flags ^ fc->sb_flags) & SB_RDONLY) {
1600 if (fc->sb_flags & SB_RDONLY) {
1601 gfs2_make_fs_ro(sdp);
1602 } else {
1603 error = gfs2_make_fs_rw(sdp);
1604 if (error)
1605 errorfc(fc, "unable to remount read-write");
1606 }
1607 }
1608 sdp->sd_args = *newargs;
1609
1610 if (sdp->sd_args.ar_posix_acl)
1611 sb->s_flags |= SB_POSIXACL;
1612 else
1613 sb->s_flags &= ~SB_POSIXACL;
1614 if (sdp->sd_args.ar_nobarrier)
1615 set_bit(nr: SDF_NOBARRIERS, addr: &sdp->sd_flags);
1616 else
1617 clear_bit(nr: SDF_NOBARRIERS, addr: &sdp->sd_flags);
1618 spin_lock(lock: &gt->gt_spin);
1619 gt->gt_logd_secs = newargs->ar_commit;
1620 gt->gt_quota_quantum = newargs->ar_quota_quantum;
1621 if (newargs->ar_statfs_quantum) {
1622 gt->gt_statfs_slow = 0;
1623 gt->gt_statfs_quantum = newargs->ar_statfs_quantum;
1624 }
1625 else {
1626 gt->gt_statfs_slow = 1;
1627 gt->gt_statfs_quantum = 30;
1628 }
1629 spin_unlock(lock: &gt->gt_spin);
1630
1631 gfs2_online_uevent(sdp);
1632 return error;
1633}
1634
1635static const struct fs_context_operations gfs2_context_ops = {
1636 .free = gfs2_fc_free,
1637 .parse_param = gfs2_parse_param,
1638 .get_tree = gfs2_get_tree,
1639 .reconfigure = gfs2_reconfigure,
1640};
1641
1642/* Set up the filesystem mount context */
1643static int gfs2_init_fs_context(struct fs_context *fc)
1644{
1645 struct gfs2_args *args;
1646
1647 args = kmalloc(size: sizeof(*args), GFP_KERNEL);
1648 if (args == NULL)
1649 return -ENOMEM;
1650
1651 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
1652 struct gfs2_sbd *sdp = fc->root->d_sb->s_fs_info;
1653
1654 *args = sdp->sd_args;
1655 } else {
1656 memset(args, 0, sizeof(*args));
1657 args->ar_quota = GFS2_QUOTA_DEFAULT;
1658 args->ar_data = GFS2_DATA_DEFAULT;
1659 args->ar_commit = 30;
1660 args->ar_statfs_quantum = 30;
1661 args->ar_quota_quantum = 60;
1662 args->ar_errors = GFS2_ERRORS_DEFAULT;
1663 }
1664 fc->fs_private = args;
1665 fc->ops = &gfs2_context_ops;
1666 return 0;
1667}
1668
1669static int set_meta_super(struct super_block *s, struct fs_context *fc)
1670{
1671 return -EINVAL;
1672}
1673
1674static int test_meta_super(struct super_block *s, struct fs_context *fc)
1675{
1676 return (fc->sget_key == s->s_bdev);
1677}
1678
1679static int gfs2_meta_get_tree(struct fs_context *fc)
1680{
1681 struct super_block *s;
1682 struct gfs2_sbd *sdp;
1683 struct path path;
1684 int error;
1685
1686 if (!fc->source || !*fc->source)
1687 return -EINVAL;
1688
1689 error = kern_path(fc->source, LOOKUP_FOLLOW, &path);
1690 if (error) {
1691 pr_warn("path_lookup on %s returned error %d\n",
1692 fc->source, error);
1693 return error;
1694 }
1695 fc->fs_type = &gfs2_fs_type;
1696 fc->sget_key = path.dentry->d_sb->s_bdev;
1697 s = sget_fc(fc, test: test_meta_super, set: set_meta_super);
1698 path_put(&path);
1699 if (IS_ERR(ptr: s)) {
1700 pr_warn("gfs2 mount does not exist\n");
1701 return PTR_ERR(ptr: s);
1702 }
1703 if ((fc->sb_flags ^ s->s_flags) & SB_RDONLY) {
1704 deactivate_locked_super(sb: s);
1705 return -EBUSY;
1706 }
1707 sdp = s->s_fs_info;
1708 fc->root = dget(dentry: sdp->sd_master_dir);
1709 return 0;
1710}
1711
1712static const struct fs_context_operations gfs2_meta_context_ops = {
1713 .free = gfs2_fc_free,
1714 .get_tree = gfs2_meta_get_tree,
1715};
1716
1717static int gfs2_meta_init_fs_context(struct fs_context *fc)
1718{
1719 int ret = gfs2_init_fs_context(fc);
1720
1721 if (ret)
1722 return ret;
1723
1724 fc->ops = &gfs2_meta_context_ops;
1725 return 0;
1726}
1727
1728/**
1729 * gfs2_evict_inodes - evict inodes cooperatively
1730 * @sb: the superblock
1731 *
1732 * When evicting an inode with a zero link count, we are trying to upgrade the
1733 * inode's iopen glock from SH to EX mode in order to determine if we can
1734 * delete the inode. The other nodes are supposed to evict the inode from
1735 * their caches if they can, and to poke the inode's inode glock if they cannot
1736 * do so. Either behavior allows gfs2_upgrade_iopen_glock() to proceed
1737 * quickly, but if the other nodes are not cooperating, the lock upgrading
1738 * attempt will time out. Since inodes are evicted sequentially, this can add
1739 * up quickly.
1740 *
1741 * Function evict_inodes() tries to keep the s_inode_list_lock list locked over
1742 * a long time, which prevents other inodes from being evicted concurrently.
1743 * This precludes the cooperative behavior we are looking for. This special
1744 * version of evict_inodes() avoids that.
1745 *
1746 * Modeled after drop_pagecache_sb().
1747 */
1748static void gfs2_evict_inodes(struct super_block *sb)
1749{
1750 struct inode *inode, *toput_inode = NULL;
1751 struct gfs2_sbd *sdp = sb->s_fs_info;
1752
1753 set_bit(nr: SDF_EVICTING, addr: &sdp->sd_flags);
1754
1755 spin_lock(lock: &sb->s_inode_list_lock);
1756 list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
1757 spin_lock(lock: &inode->i_lock);
1758 if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) &&
1759 !need_resched()) {
1760 spin_unlock(lock: &inode->i_lock);
1761 continue;
1762 }
1763 atomic_inc(v: &inode->i_count);
1764 spin_unlock(lock: &inode->i_lock);
1765 spin_unlock(lock: &sb->s_inode_list_lock);
1766
1767 iput(toput_inode);
1768 toput_inode = inode;
1769
1770 cond_resched();
1771 spin_lock(lock: &sb->s_inode_list_lock);
1772 }
1773 spin_unlock(lock: &sb->s_inode_list_lock);
1774 iput(toput_inode);
1775}
1776
1777static void gfs2_kill_sb(struct super_block *sb)
1778{
1779 struct gfs2_sbd *sdp = sb->s_fs_info;
1780
1781 if (sdp == NULL) {
1782 kill_block_super(sb);
1783 return;
1784 }
1785
1786 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SYNC | GFS2_LFC_KILL_SB);
1787 dput(sdp->sd_root_dir);
1788 dput(sdp->sd_master_dir);
1789 sdp->sd_root_dir = NULL;
1790 sdp->sd_master_dir = NULL;
1791 shrink_dcache_sb(sb);
1792
1793 gfs2_evict_inodes(sb);
1794
1795 /*
1796 * Flush and then drain the delete workqueue here (via
1797 * destroy_workqueue()) to ensure that any delete work that
1798 * may be running will also see the SDF_KILL flag.
1799 */
1800 set_bit(nr: SDF_KILL, addr: &sdp->sd_flags);
1801 gfs2_flush_delete_work(sdp);
1802 destroy_workqueue(wq: sdp->sd_delete_wq);
1803
1804 kill_block_super(sb);
1805}
1806
1807struct file_system_type gfs2_fs_type = {
1808 .name = "gfs2",
1809 .fs_flags = FS_REQUIRES_DEV,
1810 .init_fs_context = gfs2_init_fs_context,
1811 .parameters = gfs2_fs_parameters,
1812 .kill_sb = gfs2_kill_sb,
1813 .owner = THIS_MODULE,
1814};
1815MODULE_ALIAS_FS("gfs2");
1816
1817struct file_system_type gfs2meta_fs_type = {
1818 .name = "gfs2meta",
1819 .fs_flags = FS_REQUIRES_DEV,
1820 .init_fs_context = gfs2_meta_init_fs_context,
1821 .owner = THIS_MODULE,
1822};
1823MODULE_ALIAS_FS("gfs2meta");
1824

source code of linux/fs/gfs2/ops_fstype.c