1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
4 * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
5 */
6
7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
8
9 #include <linux/sched.h>
10 #include <linux/slab.h>
11 #include <linux/spinlock.h>
12 #include <linux/completion.h>
13 #include <linux/buffer_head.h>
14 #include <linux/blkdev.h>
15 #include <linux/kthread.h>
16 #include <linux/export.h>
17 #include <linux/namei.h>
18 #include <linux/mount.h>
19 #include <linux/gfs2_ondisk.h>
20 #include <linux/quotaops.h>
21 #include <linux/lockdep.h>
22 #include <linux/module.h>
23 #include <linux/backing-dev.h>
24 #include <linux/fs_parser.h>
25
26 #include "gfs2.h"
27 #include "incore.h"
28 #include "bmap.h"
29 #include "glock.h"
30 #include "glops.h"
31 #include "inode.h"
32 #include "recovery.h"
33 #include "rgrp.h"
34 #include "super.h"
35 #include "sys.h"
36 #include "util.h"
37 #include "log.h"
38 #include "quota.h"
39 #include "dir.h"
40 #include "meta_io.h"
41 #include "trace_gfs2.h"
42 #include "lops.h"
43
44 #define DO 0
45 #define UNDO 1
46
47 /**
48 * gfs2_tune_init - Fill a gfs2_tune structure with default values
49 * @gt: tune
50 *
51 */
52
gfs2_tune_init(struct gfs2_tune * gt)53 static void gfs2_tune_init(struct gfs2_tune *gt)
54 {
55 spin_lock_init(>->gt_spin);
56
57 gt->gt_quota_warn_period = 10;
58 gt->gt_quota_scale_num = 1;
59 gt->gt_quota_scale_den = 1;
60 gt->gt_new_files_jdata = 0;
61 gt->gt_max_readahead = BIT(18);
62 gt->gt_complain_secs = 10;
63 }
64
free_sbd(struct gfs2_sbd * sdp)65 void free_sbd(struct gfs2_sbd *sdp)
66 {
67 if (sdp->sd_lkstats)
68 free_percpu(sdp->sd_lkstats);
69 kfree(sdp);
70 }
71
init_sbd(struct super_block * sb)72 static struct gfs2_sbd *init_sbd(struct super_block *sb)
73 {
74 struct gfs2_sbd *sdp;
75 struct address_space *mapping;
76
77 sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL);
78 if (!sdp)
79 return NULL;
80
81 sdp->sd_vfs = sb;
82 sdp->sd_lkstats = alloc_percpu(struct gfs2_pcpu_lkstats);
83 if (!sdp->sd_lkstats)
84 goto fail;
85 sb->s_fs_info = sdp;
86
87 set_bit(SDF_NOJOURNALID, &sdp->sd_flags);
88 gfs2_tune_init(&sdp->sd_tune);
89
90 init_waitqueue_head(&sdp->sd_glock_wait);
91 init_waitqueue_head(&sdp->sd_async_glock_wait);
92 atomic_set(&sdp->sd_glock_disposal, 0);
93 init_completion(&sdp->sd_locking_init);
94 init_completion(&sdp->sd_wdack);
95 spin_lock_init(&sdp->sd_statfs_spin);
96
97 spin_lock_init(&sdp->sd_rindex_spin);
98 sdp->sd_rindex_tree.rb_node = NULL;
99
100 INIT_LIST_HEAD(&sdp->sd_jindex_list);
101 spin_lock_init(&sdp->sd_jindex_spin);
102 mutex_init(&sdp->sd_jindex_mutex);
103 init_completion(&sdp->sd_journal_ready);
104
105 INIT_LIST_HEAD(&sdp->sd_quota_list);
106 mutex_init(&sdp->sd_quota_mutex);
107 mutex_init(&sdp->sd_quota_sync_mutex);
108 init_waitqueue_head(&sdp->sd_quota_wait);
109 INIT_LIST_HEAD(&sdp->sd_trunc_list);
110 spin_lock_init(&sdp->sd_trunc_lock);
111 spin_lock_init(&sdp->sd_bitmap_lock);
112
113 INIT_LIST_HEAD(&sdp->sd_sc_inodes_list);
114
115 mapping = &sdp->sd_aspace;
116
117 address_space_init_once(mapping);
118 mapping->a_ops = &gfs2_rgrp_aops;
119 mapping->host = sb->s_bdev->bd_inode;
120 mapping->flags = 0;
121 mapping_set_gfp_mask(mapping, GFP_NOFS);
122 mapping->private_data = NULL;
123 mapping->writeback_index = 0;
124
125 spin_lock_init(&sdp->sd_log_lock);
126 atomic_set(&sdp->sd_log_pinned, 0);
127 INIT_LIST_HEAD(&sdp->sd_log_revokes);
128 INIT_LIST_HEAD(&sdp->sd_log_ordered);
129 spin_lock_init(&sdp->sd_ordered_lock);
130
131 init_waitqueue_head(&sdp->sd_log_waitq);
132 init_waitqueue_head(&sdp->sd_logd_waitq);
133 spin_lock_init(&sdp->sd_ail_lock);
134 INIT_LIST_HEAD(&sdp->sd_ail1_list);
135 INIT_LIST_HEAD(&sdp->sd_ail2_list);
136
137 init_rwsem(&sdp->sd_log_flush_lock);
138 atomic_set(&sdp->sd_log_in_flight, 0);
139 atomic_set(&sdp->sd_reserving_log, 0);
140 init_waitqueue_head(&sdp->sd_reserving_log_wait);
141 init_waitqueue_head(&sdp->sd_log_flush_wait);
142 atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN);
143 mutex_init(&sdp->sd_freeze_mutex);
144
145 return sdp;
146
147 fail:
148 free_sbd(sdp);
149 return NULL;
150 }
151
152 /**
153 * gfs2_check_sb - Check superblock
154 * @sdp: the filesystem
155 * @sb: The superblock
156 * @silent: Don't print a message if the check fails
157 *
158 * Checks the version code of the FS is one that we understand how to
159 * read and that the sizes of the various on-disk structures have not
160 * changed.
161 */
162
gfs2_check_sb(struct gfs2_sbd * sdp,int silent)163 static int gfs2_check_sb(struct gfs2_sbd *sdp, int silent)
164 {
165 struct gfs2_sb_host *sb = &sdp->sd_sb;
166
167 if (sb->sb_magic != GFS2_MAGIC ||
168 sb->sb_type != GFS2_METATYPE_SB) {
169 if (!silent)
170 pr_warn("not a GFS2 filesystem\n");
171 return -EINVAL;
172 }
173
174 if (sb->sb_fs_format != GFS2_FORMAT_FS ||
175 sb->sb_multihost_format != GFS2_FORMAT_MULTI) {
176 fs_warn(sdp, "Unknown on-disk format, unable to mount\n");
177 return -EINVAL;
178 }
179
180 if (sb->sb_bsize < 512 || sb->sb_bsize > PAGE_SIZE ||
181 (sb->sb_bsize & (sb->sb_bsize - 1))) {
182 pr_warn("Invalid superblock size\n");
183 return -EINVAL;
184 }
185
186 return 0;
187 }
188
end_bio_io_page(struct bio * bio)189 static void end_bio_io_page(struct bio *bio)
190 {
191 struct page *page = bio->bi_private;
192
193 if (!bio->bi_status)
194 SetPageUptodate(page);
195 else
196 pr_warn("error %d reading superblock\n", bio->bi_status);
197 unlock_page(page);
198 }
199
gfs2_sb_in(struct gfs2_sbd * sdp,const void * buf)200 static void gfs2_sb_in(struct gfs2_sbd *sdp, const void *buf)
201 {
202 struct gfs2_sb_host *sb = &sdp->sd_sb;
203 struct super_block *s = sdp->sd_vfs;
204 const struct gfs2_sb *str = buf;
205
206 sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic);
207 sb->sb_type = be32_to_cpu(str->sb_header.mh_type);
208 sb->sb_format = be32_to_cpu(str->sb_header.mh_format);
209 sb->sb_fs_format = be32_to_cpu(str->sb_fs_format);
210 sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format);
211 sb->sb_bsize = be32_to_cpu(str->sb_bsize);
212 sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift);
213 sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr);
214 sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino);
215 sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr);
216 sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino);
217
218 memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN);
219 memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN);
220 memcpy(&s->s_uuid, str->sb_uuid, 16);
221 }
222
223 /**
224 * gfs2_read_super - Read the gfs2 super block from disk
225 * @sdp: The GFS2 super block
226 * @sector: The location of the super block
227 * @error: The error code to return
228 *
229 * This uses the bio functions to read the super block from disk
230 * because we want to be 100% sure that we never read cached data.
231 * A super block is read twice only during each GFS2 mount and is
232 * never written to by the filesystem. The first time its read no
233 * locks are held, and the only details which are looked at are those
234 * relating to the locking protocol. Once locking is up and working,
235 * the sb is read again under the lock to establish the location of
236 * the master directory (contains pointers to journals etc) and the
237 * root directory.
238 *
239 * Returns: 0 on success or error
240 */
241
gfs2_read_super(struct gfs2_sbd * sdp,sector_t sector,int silent)242 static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector, int silent)
243 {
244 struct super_block *sb = sdp->sd_vfs;
245 struct gfs2_sb *p;
246 struct page *page;
247 struct bio *bio;
248
249 page = alloc_page(GFP_NOFS);
250 if (unlikely(!page))
251 return -ENOMEM;
252
253 ClearPageUptodate(page);
254 ClearPageDirty(page);
255 lock_page(page);
256
257 bio = bio_alloc(GFP_NOFS, 1);
258 bio->bi_iter.bi_sector = sector * (sb->s_blocksize >> 9);
259 bio_set_dev(bio, sb->s_bdev);
260 bio_add_page(bio, page, PAGE_SIZE, 0);
261
262 bio->bi_end_io = end_bio_io_page;
263 bio->bi_private = page;
264 bio_set_op_attrs(bio, REQ_OP_READ, REQ_META);
265 submit_bio(bio);
266 wait_on_page_locked(page);
267 bio_put(bio);
268 if (!PageUptodate(page)) {
269 __free_page(page);
270 return -EIO;
271 }
272 p = kmap(page);
273 gfs2_sb_in(sdp, p);
274 kunmap(page);
275 __free_page(page);
276 return gfs2_check_sb(sdp, silent);
277 }
278
279 /**
280 * gfs2_read_sb - Read super block
281 * @sdp: The GFS2 superblock
282 * @silent: Don't print message if mount fails
283 *
284 */
285
gfs2_read_sb(struct gfs2_sbd * sdp,int silent)286 static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent)
287 {
288 u32 hash_blocks, ind_blocks, leaf_blocks;
289 u32 tmp_blocks;
290 unsigned int x;
291 int error;
292
293 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
294 if (error) {
295 if (!silent)
296 fs_err(sdp, "can't read superblock\n");
297 return error;
298 }
299
300 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
301 GFS2_BASIC_BLOCK_SHIFT;
302 sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift);
303 sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
304 sizeof(struct gfs2_dinode)) / sizeof(u64);
305 sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
306 sizeof(struct gfs2_meta_header)) / sizeof(u64);
307 sdp->sd_ldptrs = (sdp->sd_sb.sb_bsize -
308 sizeof(struct gfs2_log_descriptor)) / sizeof(u64);
309 sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
310 sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
311 sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
312 sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64);
313 sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
314 sizeof(struct gfs2_meta_header)) /
315 sizeof(struct gfs2_quota_change);
316 sdp->sd_blocks_per_bitmap = (sdp->sd_sb.sb_bsize -
317 sizeof(struct gfs2_meta_header))
318 * GFS2_NBBY; /* not the rgrp bitmap, subsequent bitmaps only */
319
320 /* Compute maximum reservation required to add a entry to a directory */
321
322 hash_blocks = DIV_ROUND_UP(sizeof(u64) * BIT(GFS2_DIR_MAX_DEPTH),
323 sdp->sd_jbsize);
324
325 ind_blocks = 0;
326 for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
327 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
328 ind_blocks += tmp_blocks;
329 }
330
331 leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
332
333 sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
334
335 sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
336 sizeof(struct gfs2_dinode);
337 sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
338 for (x = 2;; x++) {
339 u64 space, d;
340 u32 m;
341
342 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
343 d = space;
344 m = do_div(d, sdp->sd_inptrs);
345
346 if (d != sdp->sd_heightsize[x - 1] || m)
347 break;
348 sdp->sd_heightsize[x] = space;
349 }
350 sdp->sd_max_height = x;
351 sdp->sd_heightsize[x] = ~0;
352 gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
353
354 sdp->sd_max_dents_per_leaf = (sdp->sd_sb.sb_bsize -
355 sizeof(struct gfs2_leaf)) /
356 GFS2_MIN_DIRENT_SIZE;
357 return 0;
358 }
359
init_names(struct gfs2_sbd * sdp,int silent)360 static int init_names(struct gfs2_sbd *sdp, int silent)
361 {
362 char *proto, *table;
363 int error = 0;
364
365 proto = sdp->sd_args.ar_lockproto;
366 table = sdp->sd_args.ar_locktable;
367
368 /* Try to autodetect */
369
370 if (!proto[0] || !table[0]) {
371 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
372 if (error)
373 return error;
374
375 if (!proto[0])
376 proto = sdp->sd_sb.sb_lockproto;
377 if (!table[0])
378 table = sdp->sd_sb.sb_locktable;
379 }
380
381 if (!table[0])
382 table = sdp->sd_vfs->s_id;
383
384 strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN);
385 strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN);
386
387 table = sdp->sd_table_name;
388 while ((table = strchr(table, '/')))
389 *table = '_';
390
391 return error;
392 }
393
init_locking(struct gfs2_sbd * sdp,struct gfs2_holder * mount_gh,int undo)394 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
395 int undo)
396 {
397 int error = 0;
398
399 if (undo)
400 goto fail_trans;
401
402 error = gfs2_glock_nq_num(sdp,
403 GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
404 LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
405 mount_gh);
406 if (error) {
407 fs_err(sdp, "can't acquire mount glock: %d\n", error);
408 goto fail;
409 }
410
411 error = gfs2_glock_nq_num(sdp,
412 GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
413 LM_ST_SHARED,
414 LM_FLAG_NOEXP | GL_EXACT,
415 &sdp->sd_live_gh);
416 if (error) {
417 fs_err(sdp, "can't acquire live glock: %d\n", error);
418 goto fail_mount;
419 }
420
421 error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
422 CREATE, &sdp->sd_rename_gl);
423 if (error) {
424 fs_err(sdp, "can't create rename glock: %d\n", error);
425 goto fail_live;
426 }
427
428 error = gfs2_glock_get(sdp, GFS2_FREEZE_LOCK, &gfs2_freeze_glops,
429 CREATE, &sdp->sd_freeze_gl);
430 if (error) {
431 fs_err(sdp, "can't create transaction glock: %d\n", error);
432 goto fail_rename;
433 }
434
435 return 0;
436
437 fail_trans:
438 gfs2_glock_put(sdp->sd_freeze_gl);
439 fail_rename:
440 gfs2_glock_put(sdp->sd_rename_gl);
441 fail_live:
442 gfs2_glock_dq_uninit(&sdp->sd_live_gh);
443 fail_mount:
444 gfs2_glock_dq_uninit(mount_gh);
445 fail:
446 return error;
447 }
448
gfs2_lookup_root(struct super_block * sb,struct dentry ** dptr,u64 no_addr,const char * name)449 static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr,
450 u64 no_addr, const char *name)
451 {
452 struct gfs2_sbd *sdp = sb->s_fs_info;
453 struct dentry *dentry;
454 struct inode *inode;
455
456 inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0,
457 GFS2_BLKST_FREE /* ignore */);
458 if (IS_ERR(inode)) {
459 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode));
460 return PTR_ERR(inode);
461 }
462 dentry = d_make_root(inode);
463 if (!dentry) {
464 fs_err(sdp, "can't alloc %s dentry\n", name);
465 return -ENOMEM;
466 }
467 *dptr = dentry;
468 return 0;
469 }
470
init_sb(struct gfs2_sbd * sdp,int silent)471 static int init_sb(struct gfs2_sbd *sdp, int silent)
472 {
473 struct super_block *sb = sdp->sd_vfs;
474 struct gfs2_holder sb_gh;
475 u64 no_addr;
476 int ret;
477
478 ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
479 LM_ST_SHARED, 0, &sb_gh);
480 if (ret) {
481 fs_err(sdp, "can't acquire superblock glock: %d\n", ret);
482 return ret;
483 }
484
485 ret = gfs2_read_sb(sdp, silent);
486 if (ret) {
487 fs_err(sdp, "can't read superblock: %d\n", ret);
488 goto out;
489 }
490
491 /* Set up the buffer cache and SB for real */
492 if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) {
493 ret = -EINVAL;
494 fs_err(sdp, "FS block size (%u) is too small for device "
495 "block size (%u)\n",
496 sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev));
497 goto out;
498 }
499 if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
500 ret = -EINVAL;
501 fs_err(sdp, "FS block size (%u) is too big for machine "
502 "page size (%u)\n",
503 sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
504 goto out;
505 }
506 sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
507
508 /* Get the root inode */
509 no_addr = sdp->sd_sb.sb_root_dir.no_addr;
510 ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root");
511 if (ret)
512 goto out;
513
514 /* Get the master inode */
515 no_addr = sdp->sd_sb.sb_master_dir.no_addr;
516 ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master");
517 if (ret) {
518 dput(sdp->sd_root_dir);
519 goto out;
520 }
521 sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir);
522 out:
523 gfs2_glock_dq_uninit(&sb_gh);
524 return ret;
525 }
526
gfs2_others_may_mount(struct gfs2_sbd * sdp)527 static void gfs2_others_may_mount(struct gfs2_sbd *sdp)
528 {
529 char *message = "FIRSTMOUNT=Done";
530 char *envp[] = { message, NULL };
531
532 fs_info(sdp, "first mount done, others may mount\n");
533
534 if (sdp->sd_lockstruct.ls_ops->lm_first_done)
535 sdp->sd_lockstruct.ls_ops->lm_first_done(sdp);
536
537 kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp);
538 }
539
540 /**
541 * gfs2_jindex_hold - Grab a lock on the jindex
542 * @sdp: The GFS2 superblock
543 * @ji_gh: the holder for the jindex glock
544 *
545 * Returns: errno
546 */
547
gfs2_jindex_hold(struct gfs2_sbd * sdp,struct gfs2_holder * ji_gh)548 static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
549 {
550 struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex);
551 struct qstr name;
552 char buf[20];
553 struct gfs2_jdesc *jd;
554 int error;
555
556 name.name = buf;
557
558 mutex_lock(&sdp->sd_jindex_mutex);
559
560 for (;;) {
561 struct gfs2_inode *jip;
562
563 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh);
564 if (error)
565 break;
566
567 name.len = sprintf(buf, "journal%u", sdp->sd_journals);
568 name.hash = gfs2_disk_hash(name.name, name.len);
569
570 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL);
571 if (error == -ENOENT) {
572 error = 0;
573 break;
574 }
575
576 gfs2_glock_dq_uninit(ji_gh);
577
578 if (error)
579 break;
580
581 error = -ENOMEM;
582 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
583 if (!jd)
584 break;
585
586 INIT_LIST_HEAD(&jd->extent_list);
587 INIT_LIST_HEAD(&jd->jd_revoke_list);
588
589 INIT_WORK(&jd->jd_work, gfs2_recover_func);
590 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1);
591 if (IS_ERR_OR_NULL(jd->jd_inode)) {
592 if (!jd->jd_inode)
593 error = -ENOENT;
594 else
595 error = PTR_ERR(jd->jd_inode);
596 kfree(jd);
597 break;
598 }
599
600 spin_lock(&sdp->sd_jindex_spin);
601 jd->jd_jid = sdp->sd_journals++;
602 jip = GFS2_I(jd->jd_inode);
603 jd->jd_no_addr = jip->i_no_addr;
604 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
605 spin_unlock(&sdp->sd_jindex_spin);
606 }
607
608 mutex_unlock(&sdp->sd_jindex_mutex);
609
610 return error;
611 }
612
613 /**
614 * init_statfs - look up and initialize master and local (per node) statfs inodes
615 * @sdp: The GFS2 superblock
616 *
617 * This should be called after the jindex is initialized in init_journal() and
618 * before gfs2_journal_recovery() is called because we need to be able to write
619 * to these inodes during recovery.
620 *
621 * Returns: errno
622 */
init_statfs(struct gfs2_sbd * sdp)623 static int init_statfs(struct gfs2_sbd *sdp)
624 {
625 int error = 0;
626 struct inode *master = d_inode(sdp->sd_master_dir);
627 struct inode *pn = NULL;
628 char buf[30];
629 struct gfs2_jdesc *jd;
630 struct gfs2_inode *ip;
631
632 sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs");
633 if (IS_ERR(sdp->sd_statfs_inode)) {
634 error = PTR_ERR(sdp->sd_statfs_inode);
635 fs_err(sdp, "can't read in statfs inode: %d\n", error);
636 goto out;
637 }
638 if (sdp->sd_args.ar_spectator)
639 goto out;
640
641 pn = gfs2_lookup_simple(master, "per_node");
642 if (IS_ERR(pn)) {
643 error = PTR_ERR(pn);
644 fs_err(sdp, "can't find per_node directory: %d\n", error);
645 goto put_statfs;
646 }
647
648 /* For each jid, lookup the corresponding local statfs inode in the
649 * per_node metafs directory and save it in the sdp->sd_sc_inodes_list. */
650 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
651 struct local_statfs_inode *lsi =
652 kmalloc(sizeof(struct local_statfs_inode), GFP_NOFS);
653 if (!lsi) {
654 error = -ENOMEM;
655 goto free_local;
656 }
657 sprintf(buf, "statfs_change%u", jd->jd_jid);
658 lsi->si_sc_inode = gfs2_lookup_simple(pn, buf);
659 if (IS_ERR(lsi->si_sc_inode)) {
660 error = PTR_ERR(lsi->si_sc_inode);
661 fs_err(sdp, "can't find local \"sc\" file#%u: %d\n",
662 jd->jd_jid, error);
663 goto free_local;
664 }
665 lsi->si_jid = jd->jd_jid;
666 if (jd->jd_jid == sdp->sd_jdesc->jd_jid)
667 sdp->sd_sc_inode = lsi->si_sc_inode;
668
669 list_add_tail(&lsi->si_list, &sdp->sd_sc_inodes_list);
670 }
671
672 iput(pn);
673 ip = GFS2_I(sdp->sd_sc_inode);
674 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
675 &sdp->sd_sc_gh);
676 if (error) {
677 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
678 goto free_local;
679 }
680 return 0;
681
682 free_local:
683 free_local_statfs_inodes(sdp);
684 iput(pn);
685 put_statfs:
686 iput(sdp->sd_statfs_inode);
687 out:
688 return error;
689 }
690
691 /* Uninitialize and free up memory used by the list of statfs inodes */
uninit_statfs(struct gfs2_sbd * sdp)692 static void uninit_statfs(struct gfs2_sbd *sdp)
693 {
694 if (!sdp->sd_args.ar_spectator) {
695 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
696 free_local_statfs_inodes(sdp);
697 }
698 iput(sdp->sd_statfs_inode);
699 }
700
init_journal(struct gfs2_sbd * sdp,int undo)701 static int init_journal(struct gfs2_sbd *sdp, int undo)
702 {
703 struct inode *master = d_inode(sdp->sd_master_dir);
704 struct gfs2_holder ji_gh;
705 struct gfs2_inode *ip;
706 int jindex = 1;
707 int error = 0;
708
709 if (undo) {
710 jindex = 0;
711 goto fail_statfs;
712 }
713
714 sdp->sd_jindex = gfs2_lookup_simple(master, "jindex");
715 if (IS_ERR(sdp->sd_jindex)) {
716 fs_err(sdp, "can't lookup journal index: %d\n", error);
717 return PTR_ERR(sdp->sd_jindex);
718 }
719
720 /* Load in the journal index special file */
721
722 error = gfs2_jindex_hold(sdp, &ji_gh);
723 if (error) {
724 fs_err(sdp, "can't read journal index: %d\n", error);
725 goto fail;
726 }
727
728 error = -EUSERS;
729 if (!gfs2_jindex_size(sdp)) {
730 fs_err(sdp, "no journals!\n");
731 goto fail_jindex;
732 }
733
734 atomic_set(&sdp->sd_log_blks_needed, 0);
735 if (sdp->sd_args.ar_spectator) {
736 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
737 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
738 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
739 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
740 } else {
741 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
742 fs_err(sdp, "can't mount journal #%u\n",
743 sdp->sd_lockstruct.ls_jid);
744 fs_err(sdp, "there are only %u journals (0 - %u)\n",
745 gfs2_jindex_size(sdp),
746 gfs2_jindex_size(sdp) - 1);
747 goto fail_jindex;
748 }
749 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
750
751 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
752 &gfs2_journal_glops,
753 LM_ST_EXCLUSIVE,
754 LM_FLAG_NOEXP | GL_NOCACHE,
755 &sdp->sd_journal_gh);
756 if (error) {
757 fs_err(sdp, "can't acquire journal glock: %d\n", error);
758 goto fail_jindex;
759 }
760
761 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
762 sdp->sd_jinode_gl = ip->i_gl;
763 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
764 LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE,
765 &sdp->sd_jinode_gh);
766 if (error) {
767 fs_err(sdp, "can't acquire journal inode glock: %d\n",
768 error);
769 goto fail_journal_gh;
770 }
771
772 error = gfs2_jdesc_check(sdp->sd_jdesc);
773 if (error) {
774 fs_err(sdp, "my journal (%u) is bad: %d\n",
775 sdp->sd_jdesc->jd_jid, error);
776 goto fail_jinode_gh;
777 }
778 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
779 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
780 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
781
782 /* Map the extents for this journal's blocks */
783 gfs2_map_journal_extents(sdp, sdp->sd_jdesc);
784 }
785 trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free));
786
787 /* Lookup statfs inodes here so journal recovery can use them. */
788 error = init_statfs(sdp);
789 if (error)
790 goto fail_jinode_gh;
791
792 if (sdp->sd_lockstruct.ls_first) {
793 unsigned int x;
794 for (x = 0; x < sdp->sd_journals; x++) {
795 struct gfs2_jdesc *jd = gfs2_jdesc_find(sdp, x);
796
797 if (sdp->sd_args.ar_spectator) {
798 error = check_journal_clean(sdp, jd, true);
799 if (error)
800 goto fail_statfs;
801 continue;
802 }
803 error = gfs2_recover_journal(jd, true);
804 if (error) {
805 fs_err(sdp, "error recovering journal %u: %d\n",
806 x, error);
807 goto fail_statfs;
808 }
809 }
810
811 gfs2_others_may_mount(sdp);
812 } else if (!sdp->sd_args.ar_spectator) {
813 error = gfs2_recover_journal(sdp->sd_jdesc, true);
814 if (error) {
815 fs_err(sdp, "error recovering my journal: %d\n", error);
816 goto fail_statfs;
817 }
818 }
819
820 sdp->sd_log_idle = 1;
821 set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
822 gfs2_glock_dq_uninit(&ji_gh);
823 jindex = 0;
824 INIT_WORK(&sdp->sd_freeze_work, gfs2_freeze_func);
825 return 0;
826
827 fail_statfs:
828 uninit_statfs(sdp);
829 fail_jinode_gh:
830 /* A withdraw may have done dq/uninit so now we need to check it */
831 if (!sdp->sd_args.ar_spectator &&
832 gfs2_holder_initialized(&sdp->sd_jinode_gh))
833 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
834 fail_journal_gh:
835 if (!sdp->sd_args.ar_spectator &&
836 gfs2_holder_initialized(&sdp->sd_journal_gh))
837 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
838 fail_jindex:
839 gfs2_jindex_free(sdp);
840 if (jindex)
841 gfs2_glock_dq_uninit(&ji_gh);
842 fail:
843 iput(sdp->sd_jindex);
844 return error;
845 }
846
847 static struct lock_class_key gfs2_quota_imutex_key;
848
init_inodes(struct gfs2_sbd * sdp,int undo)849 static int init_inodes(struct gfs2_sbd *sdp, int undo)
850 {
851 int error = 0;
852 struct inode *master = d_inode(sdp->sd_master_dir);
853
854 if (undo)
855 goto fail_qinode;
856
857 error = init_journal(sdp, undo);
858 complete_all(&sdp->sd_journal_ready);
859 if (error)
860 goto fail;
861
862 /* Read in the resource index inode */
863 sdp->sd_rindex = gfs2_lookup_simple(master, "rindex");
864 if (IS_ERR(sdp->sd_rindex)) {
865 error = PTR_ERR(sdp->sd_rindex);
866 fs_err(sdp, "can't get resource index inode: %d\n", error);
867 goto fail_journal;
868 }
869 sdp->sd_rindex_uptodate = 0;
870
871 /* Read in the quota inode */
872 sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota");
873 if (IS_ERR(sdp->sd_quota_inode)) {
874 error = PTR_ERR(sdp->sd_quota_inode);
875 fs_err(sdp, "can't get quota file inode: %d\n", error);
876 goto fail_rindex;
877 }
878 /*
879 * i_rwsem on quota files is special. Since this inode is hidden system
880 * file, we are safe to define locking ourselves.
881 */
882 lockdep_set_class(&sdp->sd_quota_inode->i_rwsem,
883 &gfs2_quota_imutex_key);
884
885 error = gfs2_rindex_update(sdp);
886 if (error)
887 goto fail_qinode;
888
889 return 0;
890
891 fail_qinode:
892 iput(sdp->sd_quota_inode);
893 fail_rindex:
894 gfs2_clear_rgrpd(sdp);
895 iput(sdp->sd_rindex);
896 fail_journal:
897 init_journal(sdp, UNDO);
898 fail:
899 return error;
900 }
901
init_per_node(struct gfs2_sbd * sdp,int undo)902 static int init_per_node(struct gfs2_sbd *sdp, int undo)
903 {
904 struct inode *pn = NULL;
905 char buf[30];
906 int error = 0;
907 struct gfs2_inode *ip;
908 struct inode *master = d_inode(sdp->sd_master_dir);
909
910 if (sdp->sd_args.ar_spectator)
911 return 0;
912
913 if (undo)
914 goto fail_qc_gh;
915
916 pn = gfs2_lookup_simple(master, "per_node");
917 if (IS_ERR(pn)) {
918 error = PTR_ERR(pn);
919 fs_err(sdp, "can't find per_node directory: %d\n", error);
920 return error;
921 }
922
923 sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
924 sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
925 if (IS_ERR(sdp->sd_qc_inode)) {
926 error = PTR_ERR(sdp->sd_qc_inode);
927 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
928 goto fail_ut_i;
929 }
930
931 iput(pn);
932 pn = NULL;
933
934 ip = GFS2_I(sdp->sd_qc_inode);
935 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
936 &sdp->sd_qc_gh);
937 if (error) {
938 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
939 goto fail_qc_i;
940 }
941
942 return 0;
943
944 fail_qc_gh:
945 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
946 fail_qc_i:
947 iput(sdp->sd_qc_inode);
948 fail_ut_i:
949 iput(pn);
950 return error;
951 }
952
953 static const match_table_t nolock_tokens = {
954 { Opt_jid, "jid=%d", },
955 { Opt_err, NULL },
956 };
957
958 static const struct lm_lockops nolock_ops = {
959 .lm_proto_name = "lock_nolock",
960 .lm_put_lock = gfs2_glock_free,
961 .lm_tokens = &nolock_tokens,
962 };
963
964 /**
965 * gfs2_lm_mount - mount a locking protocol
966 * @sdp: the filesystem
967 * @args: mount arguments
968 * @silent: if 1, don't complain if the FS isn't a GFS2 fs
969 *
970 * Returns: errno
971 */
972
gfs2_lm_mount(struct gfs2_sbd * sdp,int silent)973 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
974 {
975 const struct lm_lockops *lm;
976 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
977 struct gfs2_args *args = &sdp->sd_args;
978 const char *proto = sdp->sd_proto_name;
979 const char *table = sdp->sd_table_name;
980 char *o, *options;
981 int ret;
982
983 if (!strcmp("lock_nolock", proto)) {
984 lm = &nolock_ops;
985 sdp->sd_args.ar_localflocks = 1;
986 #ifdef CONFIG_GFS2_FS_LOCKING_DLM
987 } else if (!strcmp("lock_dlm", proto)) {
988 lm = &gfs2_dlm_ops;
989 #endif
990 } else {
991 pr_info("can't find protocol %s\n", proto);
992 return -ENOENT;
993 }
994
995 fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);
996
997 ls->ls_ops = lm;
998 ls->ls_first = 1;
999
1000 for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) {
1001 substring_t tmp[MAX_OPT_ARGS];
1002 int token, option;
1003
1004 if (!o || !*o)
1005 continue;
1006
1007 token = match_token(o, *lm->lm_tokens, tmp);
1008 switch (token) {
1009 case Opt_jid:
1010 ret = match_int(&tmp[0], &option);
1011 if (ret || option < 0)
1012 goto hostdata_error;
1013 if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags))
1014 ls->ls_jid = option;
1015 break;
1016 case Opt_id:
1017 case Opt_nodir:
1018 /* Obsolete, but left for backward compat purposes */
1019 break;
1020 case Opt_first:
1021 ret = match_int(&tmp[0], &option);
1022 if (ret || (option != 0 && option != 1))
1023 goto hostdata_error;
1024 ls->ls_first = option;
1025 break;
1026 case Opt_err:
1027 default:
1028 hostdata_error:
1029 fs_info(sdp, "unknown hostdata (%s)\n", o);
1030 return -EINVAL;
1031 }
1032 }
1033
1034 if (lm->lm_mount == NULL) {
1035 fs_info(sdp, "Now mounting FS...\n");
1036 complete_all(&sdp->sd_locking_init);
1037 return 0;
1038 }
1039 ret = lm->lm_mount(sdp, table);
1040 if (ret == 0)
1041 fs_info(sdp, "Joined cluster. Now mounting FS...\n");
1042 complete_all(&sdp->sd_locking_init);
1043 return ret;
1044 }
1045
gfs2_lm_unmount(struct gfs2_sbd * sdp)1046 void gfs2_lm_unmount(struct gfs2_sbd *sdp)
1047 {
1048 const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops;
1049 if (likely(!gfs2_withdrawn(sdp)) && lm->lm_unmount)
1050 lm->lm_unmount(sdp);
1051 }
1052
wait_on_journal(struct gfs2_sbd * sdp)1053 static int wait_on_journal(struct gfs2_sbd *sdp)
1054 {
1055 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
1056 return 0;
1057
1058 return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, TASK_INTERRUPTIBLE)
1059 ? -EINTR : 0;
1060 }
1061
gfs2_online_uevent(struct gfs2_sbd * sdp)1062 void gfs2_online_uevent(struct gfs2_sbd *sdp)
1063 {
1064 struct super_block *sb = sdp->sd_vfs;
1065 char ro[20];
1066 char spectator[20];
1067 char *envp[] = { ro, spectator, NULL };
1068 sprintf(ro, "RDONLY=%d", sb_rdonly(sb));
1069 sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
1070 kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp);
1071 }
1072
1073 /**
1074 * gfs2_fill_super - Read in superblock
1075 * @sb: The VFS superblock
1076 * @args: Mount options
1077 * @silent: Don't complain if it's not a GFS2 filesystem
1078 *
1079 * Returns: -errno
1080 */
gfs2_fill_super(struct super_block * sb,struct fs_context * fc)1081 static int gfs2_fill_super(struct super_block *sb, struct fs_context *fc)
1082 {
1083 struct gfs2_args *args = fc->fs_private;
1084 int silent = fc->sb_flags & SB_SILENT;
1085 struct gfs2_sbd *sdp;
1086 struct gfs2_holder mount_gh;
1087 int error;
1088
1089 sdp = init_sbd(sb);
1090 if (!sdp) {
1091 pr_warn("can't alloc struct gfs2_sbd\n");
1092 return -ENOMEM;
1093 }
1094 sdp->sd_args = *args;
1095
1096 if (sdp->sd_args.ar_spectator) {
1097 sb->s_flags |= SB_RDONLY;
1098 set_bit(SDF_RORECOVERY, &sdp->sd_flags);
1099 }
1100 if (sdp->sd_args.ar_posix_acl)
1101 sb->s_flags |= SB_POSIXACL;
1102 if (sdp->sd_args.ar_nobarrier)
1103 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1104
1105 sb->s_flags |= SB_NOSEC;
1106 sb->s_magic = GFS2_MAGIC;
1107 sb->s_op = &gfs2_super_ops;
1108 sb->s_d_op = &gfs2_dops;
1109 sb->s_export_op = &gfs2_export_ops;
1110 sb->s_xattr = gfs2_xattr_handlers;
1111 sb->s_qcop = &gfs2_quotactl_ops;
1112 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1113 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
1114 sb->s_time_gran = 1;
1115 sb->s_maxbytes = MAX_LFS_FILESIZE;
1116
1117 /* Set up the buffer cache and fill in some fake block size values
1118 to allow us to read-in the on-disk superblock. */
1119 sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
1120 sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
1121 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
1122 GFS2_BASIC_BLOCK_SHIFT;
1123 sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift);
1124
1125 sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit;
1126 sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum;
1127 if (sdp->sd_args.ar_statfs_quantum) {
1128 sdp->sd_tune.gt_statfs_slow = 0;
1129 sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum;
1130 } else {
1131 sdp->sd_tune.gt_statfs_slow = 1;
1132 sdp->sd_tune.gt_statfs_quantum = 30;
1133 }
1134
1135 error = init_names(sdp, silent);
1136 if (error)
1137 goto fail_free;
1138
1139 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s", sdp->sd_table_name);
1140
1141 error = gfs2_sys_fs_add(sdp);
1142 if (error)
1143 goto fail_free;
1144
1145 gfs2_create_debugfs_file(sdp);
1146
1147 error = gfs2_lm_mount(sdp, silent);
1148 if (error)
1149 goto fail_debug;
1150
1151 error = init_locking(sdp, &mount_gh, DO);
1152 if (error)
1153 goto fail_lm;
1154
1155 error = init_sb(sdp, silent);
1156 if (error)
1157 goto fail_locking;
1158
1159 error = wait_on_journal(sdp);
1160 if (error)
1161 goto fail_sb;
1162
1163 /*
1164 * If user space has failed to join the cluster or some similar
1165 * failure has occurred, then the journal id will contain a
1166 * negative (error) number. This will then be returned to the
1167 * caller (of the mount syscall). We do this even for spectator
1168 * mounts (which just write a jid of 0 to indicate "ok" even though
1169 * the jid is unused in the spectator case)
1170 */
1171 if (sdp->sd_lockstruct.ls_jid < 0) {
1172 error = sdp->sd_lockstruct.ls_jid;
1173 sdp->sd_lockstruct.ls_jid = 0;
1174 goto fail_sb;
1175 }
1176
1177 if (sdp->sd_args.ar_spectator)
1178 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.s",
1179 sdp->sd_table_name);
1180 else
1181 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.%u",
1182 sdp->sd_table_name, sdp->sd_lockstruct.ls_jid);
1183
1184 error = init_inodes(sdp, DO);
1185 if (error)
1186 goto fail_sb;
1187
1188 error = init_per_node(sdp, DO);
1189 if (error)
1190 goto fail_inodes;
1191
1192 error = gfs2_statfs_init(sdp);
1193 if (error) {
1194 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
1195 goto fail_per_node;
1196 }
1197
1198 if (sb_rdonly(sb)) {
1199 struct gfs2_holder freeze_gh;
1200
1201 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED,
1202 LM_FLAG_NOEXP | GL_EXACT,
1203 &freeze_gh);
1204 if (error) {
1205 fs_err(sdp, "can't make FS RO: %d\n", error);
1206 goto fail_per_node;
1207 }
1208 gfs2_glock_dq_uninit(&freeze_gh);
1209 } else {
1210 error = gfs2_make_fs_rw(sdp);
1211 if (error) {
1212 fs_err(sdp, "can't make FS RW: %d\n", error);
1213 goto fail_per_node;
1214 }
1215 }
1216
1217 gfs2_glock_dq_uninit(&mount_gh);
1218 gfs2_online_uevent(sdp);
1219 return 0;
1220
1221 fail_per_node:
1222 init_per_node(sdp, UNDO);
1223 fail_inodes:
1224 init_inodes(sdp, UNDO);
1225 fail_sb:
1226 if (sdp->sd_root_dir)
1227 dput(sdp->sd_root_dir);
1228 if (sdp->sd_master_dir)
1229 dput(sdp->sd_master_dir);
1230 if (sb->s_root)
1231 dput(sb->s_root);
1232 sb->s_root = NULL;
1233 fail_locking:
1234 init_locking(sdp, &mount_gh, UNDO);
1235 fail_lm:
1236 complete_all(&sdp->sd_journal_ready);
1237 gfs2_gl_hash_clear(sdp);
1238 gfs2_lm_unmount(sdp);
1239 fail_debug:
1240 gfs2_delete_debugfs_file(sdp);
1241 gfs2_sys_fs_del(sdp);
1242 fail_free:
1243 free_sbd(sdp);
1244 sb->s_fs_info = NULL;
1245 return error;
1246 }
1247
1248 /**
1249 * gfs2_get_tree - Get the GFS2 superblock and root directory
1250 * @fc: The filesystem context
1251 *
1252 * Returns: 0 or -errno on error
1253 */
gfs2_get_tree(struct fs_context * fc)1254 static int gfs2_get_tree(struct fs_context *fc)
1255 {
1256 struct gfs2_args *args = fc->fs_private;
1257 struct gfs2_sbd *sdp;
1258 int error;
1259
1260 error = get_tree_bdev(fc, gfs2_fill_super);
1261 if (error)
1262 return error;
1263
1264 sdp = fc->root->d_sb->s_fs_info;
1265 dput(fc->root);
1266 if (args->ar_meta)
1267 fc->root = dget(sdp->sd_master_dir);
1268 else
1269 fc->root = dget(sdp->sd_root_dir);
1270 return 0;
1271 }
1272
gfs2_fc_free(struct fs_context * fc)1273 static void gfs2_fc_free(struct fs_context *fc)
1274 {
1275 struct gfs2_args *args = fc->fs_private;
1276
1277 kfree(args);
1278 }
1279
1280 enum gfs2_param {
1281 Opt_lockproto,
1282 Opt_locktable,
1283 Opt_hostdata,
1284 Opt_spectator,
1285 Opt_ignore_local_fs,
1286 Opt_localflocks,
1287 Opt_localcaching,
1288 Opt_debug,
1289 Opt_upgrade,
1290 Opt_acl,
1291 Opt_quota,
1292 Opt_quota_flag,
1293 Opt_suiddir,
1294 Opt_data,
1295 Opt_meta,
1296 Opt_discard,
1297 Opt_commit,
1298 Opt_errors,
1299 Opt_statfs_quantum,
1300 Opt_statfs_percent,
1301 Opt_quota_quantum,
1302 Opt_barrier,
1303 Opt_rgrplvb,
1304 Opt_loccookie,
1305 };
1306
1307 static const struct constant_table gfs2_param_quota[] = {
1308 {"off", GFS2_QUOTA_OFF},
1309 {"account", GFS2_QUOTA_ACCOUNT},
1310 {"on", GFS2_QUOTA_ON},
1311 {}
1312 };
1313
1314 enum opt_data {
1315 Opt_data_writeback = GFS2_DATA_WRITEBACK,
1316 Opt_data_ordered = GFS2_DATA_ORDERED,
1317 };
1318
1319 static const struct constant_table gfs2_param_data[] = {
1320 {"writeback", Opt_data_writeback },
1321 {"ordered", Opt_data_ordered },
1322 {}
1323 };
1324
1325 enum opt_errors {
1326 Opt_errors_withdraw = GFS2_ERRORS_WITHDRAW,
1327 Opt_errors_panic = GFS2_ERRORS_PANIC,
1328 };
1329
1330 static const struct constant_table gfs2_param_errors[] = {
1331 {"withdraw", Opt_errors_withdraw },
1332 {"panic", Opt_errors_panic },
1333 {}
1334 };
1335
1336 static const struct fs_parameter_spec gfs2_fs_parameters[] = {
1337 fsparam_string ("lockproto", Opt_lockproto),
1338 fsparam_string ("locktable", Opt_locktable),
1339 fsparam_string ("hostdata", Opt_hostdata),
1340 fsparam_flag ("spectator", Opt_spectator),
1341 fsparam_flag ("norecovery", Opt_spectator),
1342 fsparam_flag ("ignore_local_fs", Opt_ignore_local_fs),
1343 fsparam_flag ("localflocks", Opt_localflocks),
1344 fsparam_flag ("localcaching", Opt_localcaching),
1345 fsparam_flag_no("debug", Opt_debug),
1346 fsparam_flag ("upgrade", Opt_upgrade),
1347 fsparam_flag_no("acl", Opt_acl),
1348 fsparam_flag_no("suiddir", Opt_suiddir),
1349 fsparam_enum ("data", Opt_data, gfs2_param_data),
1350 fsparam_flag ("meta", Opt_meta),
1351 fsparam_flag_no("discard", Opt_discard),
1352 fsparam_s32 ("commit", Opt_commit),
1353 fsparam_enum ("errors", Opt_errors, gfs2_param_errors),
1354 fsparam_s32 ("statfs_quantum", Opt_statfs_quantum),
1355 fsparam_s32 ("statfs_percent", Opt_statfs_percent),
1356 fsparam_s32 ("quota_quantum", Opt_quota_quantum),
1357 fsparam_flag_no("barrier", Opt_barrier),
1358 fsparam_flag_no("rgrplvb", Opt_rgrplvb),
1359 fsparam_flag_no("loccookie", Opt_loccookie),
1360 /* quota can be a flag or an enum so it gets special treatment */
1361 fsparam_flag_no("quota", Opt_quota_flag),
1362 fsparam_enum("quota", Opt_quota, gfs2_param_quota),
1363 {}
1364 };
1365
1366 /* Parse a single mount parameter */
gfs2_parse_param(struct fs_context * fc,struct fs_parameter * param)1367 static int gfs2_parse_param(struct fs_context *fc, struct fs_parameter *param)
1368 {
1369 struct gfs2_args *args = fc->fs_private;
1370 struct fs_parse_result result;
1371 int o;
1372
1373 o = fs_parse(fc, gfs2_fs_parameters, param, &result);
1374 if (o < 0)
1375 return o;
1376
1377 switch (o) {
1378 case Opt_lockproto:
1379 strlcpy(args->ar_lockproto, param->string, GFS2_LOCKNAME_LEN);
1380 break;
1381 case Opt_locktable:
1382 strlcpy(args->ar_locktable, param->string, GFS2_LOCKNAME_LEN);
1383 break;
1384 case Opt_hostdata:
1385 strlcpy(args->ar_hostdata, param->string, GFS2_LOCKNAME_LEN);
1386 break;
1387 case Opt_spectator:
1388 args->ar_spectator = 1;
1389 break;
1390 case Opt_ignore_local_fs:
1391 /* Retained for backwards compat only */
1392 break;
1393 case Opt_localflocks:
1394 args->ar_localflocks = 1;
1395 break;
1396 case Opt_localcaching:
1397 /* Retained for backwards compat only */
1398 break;
1399 case Opt_debug:
1400 if (result.boolean && args->ar_errors == GFS2_ERRORS_PANIC)
1401 return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive");
1402 args->ar_debug = result.boolean;
1403 break;
1404 case Opt_upgrade:
1405 /* Retained for backwards compat only */
1406 break;
1407 case Opt_acl:
1408 args->ar_posix_acl = result.boolean;
1409 break;
1410 case Opt_quota_flag:
1411 args->ar_quota = result.negated ? GFS2_QUOTA_OFF : GFS2_QUOTA_ON;
1412 break;
1413 case Opt_quota:
1414 args->ar_quota = result.int_32;
1415 break;
1416 case Opt_suiddir:
1417 args->ar_suiddir = result.boolean;
1418 break;
1419 case Opt_data:
1420 /* The uint_32 result maps directly to GFS2_DATA_* */
1421 args->ar_data = result.uint_32;
1422 break;
1423 case Opt_meta:
1424 args->ar_meta = 1;
1425 break;
1426 case Opt_discard:
1427 args->ar_discard = result.boolean;
1428 break;
1429 case Opt_commit:
1430 if (result.int_32 <= 0)
1431 return invalfc(fc, "commit mount option requires a positive numeric argument");
1432 args->ar_commit = result.int_32;
1433 break;
1434 case Opt_statfs_quantum:
1435 if (result.int_32 < 0)
1436 return invalfc(fc, "statfs_quantum mount option requires a non-negative numeric argument");
1437 args->ar_statfs_quantum = result.int_32;
1438 break;
1439 case Opt_quota_quantum:
1440 if (result.int_32 <= 0)
1441 return invalfc(fc, "quota_quantum mount option requires a positive numeric argument");
1442 args->ar_quota_quantum = result.int_32;
1443 break;
1444 case Opt_statfs_percent:
1445 if (result.int_32 < 0 || result.int_32 > 100)
1446 return invalfc(fc, "statfs_percent mount option requires a numeric argument between 0 and 100");
1447 args->ar_statfs_percent = result.int_32;
1448 break;
1449 case Opt_errors:
1450 if (args->ar_debug && result.uint_32 == GFS2_ERRORS_PANIC)
1451 return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive");
1452 args->ar_errors = result.uint_32;
1453 break;
1454 case Opt_barrier:
1455 args->ar_nobarrier = result.boolean;
1456 break;
1457 case Opt_rgrplvb:
1458 args->ar_rgrplvb = result.boolean;
1459 break;
1460 case Opt_loccookie:
1461 args->ar_loccookie = result.boolean;
1462 break;
1463 default:
1464 return invalfc(fc, "invalid mount option: %s", param->key);
1465 }
1466 return 0;
1467 }
1468
gfs2_reconfigure(struct fs_context * fc)1469 static int gfs2_reconfigure(struct fs_context *fc)
1470 {
1471 struct super_block *sb = fc->root->d_sb;
1472 struct gfs2_sbd *sdp = sb->s_fs_info;
1473 struct gfs2_args *oldargs = &sdp->sd_args;
1474 struct gfs2_args *newargs = fc->fs_private;
1475 struct gfs2_tune *gt = &sdp->sd_tune;
1476 int error = 0;
1477
1478 sync_filesystem(sb);
1479
1480 spin_lock(>->gt_spin);
1481 oldargs->ar_commit = gt->gt_logd_secs;
1482 oldargs->ar_quota_quantum = gt->gt_quota_quantum;
1483 if (gt->gt_statfs_slow)
1484 oldargs->ar_statfs_quantum = 0;
1485 else
1486 oldargs->ar_statfs_quantum = gt->gt_statfs_quantum;
1487 spin_unlock(>->gt_spin);
1488
1489 if (strcmp(newargs->ar_lockproto, oldargs->ar_lockproto)) {
1490 errorfc(fc, "reconfiguration of locking protocol not allowed");
1491 return -EINVAL;
1492 }
1493 if (strcmp(newargs->ar_locktable, oldargs->ar_locktable)) {
1494 errorfc(fc, "reconfiguration of lock table not allowed");
1495 return -EINVAL;
1496 }
1497 if (strcmp(newargs->ar_hostdata, oldargs->ar_hostdata)) {
1498 errorfc(fc, "reconfiguration of host data not allowed");
1499 return -EINVAL;
1500 }
1501 if (newargs->ar_spectator != oldargs->ar_spectator) {
1502 errorfc(fc, "reconfiguration of spectator mode not allowed");
1503 return -EINVAL;
1504 }
1505 if (newargs->ar_localflocks != oldargs->ar_localflocks) {
1506 errorfc(fc, "reconfiguration of localflocks not allowed");
1507 return -EINVAL;
1508 }
1509 if (newargs->ar_meta != oldargs->ar_meta) {
1510 errorfc(fc, "switching between gfs2 and gfs2meta not allowed");
1511 return -EINVAL;
1512 }
1513 if (oldargs->ar_spectator)
1514 fc->sb_flags |= SB_RDONLY;
1515
1516 if ((sb->s_flags ^ fc->sb_flags) & SB_RDONLY) {
1517 if (fc->sb_flags & SB_RDONLY) {
1518 error = gfs2_make_fs_ro(sdp);
1519 if (error)
1520 errorfc(fc, "unable to remount read-only");
1521 } else {
1522 error = gfs2_make_fs_rw(sdp);
1523 if (error)
1524 errorfc(fc, "unable to remount read-write");
1525 }
1526 }
1527 sdp->sd_args = *newargs;
1528
1529 if (sdp->sd_args.ar_posix_acl)
1530 sb->s_flags |= SB_POSIXACL;
1531 else
1532 sb->s_flags &= ~SB_POSIXACL;
1533 if (sdp->sd_args.ar_nobarrier)
1534 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1535 else
1536 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1537 spin_lock(>->gt_spin);
1538 gt->gt_logd_secs = newargs->ar_commit;
1539 gt->gt_quota_quantum = newargs->ar_quota_quantum;
1540 if (newargs->ar_statfs_quantum) {
1541 gt->gt_statfs_slow = 0;
1542 gt->gt_statfs_quantum = newargs->ar_statfs_quantum;
1543 }
1544 else {
1545 gt->gt_statfs_slow = 1;
1546 gt->gt_statfs_quantum = 30;
1547 }
1548 spin_unlock(>->gt_spin);
1549
1550 gfs2_online_uevent(sdp);
1551 return error;
1552 }
1553
1554 static const struct fs_context_operations gfs2_context_ops = {
1555 .free = gfs2_fc_free,
1556 .parse_param = gfs2_parse_param,
1557 .get_tree = gfs2_get_tree,
1558 .reconfigure = gfs2_reconfigure,
1559 };
1560
1561 /* Set up the filesystem mount context */
gfs2_init_fs_context(struct fs_context * fc)1562 static int gfs2_init_fs_context(struct fs_context *fc)
1563 {
1564 struct gfs2_args *args;
1565
1566 args = kmalloc(sizeof(*args), GFP_KERNEL);
1567 if (args == NULL)
1568 return -ENOMEM;
1569
1570 if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
1571 struct gfs2_sbd *sdp = fc->root->d_sb->s_fs_info;
1572
1573 *args = sdp->sd_args;
1574 } else {
1575 memset(args, 0, sizeof(*args));
1576 args->ar_quota = GFS2_QUOTA_DEFAULT;
1577 args->ar_data = GFS2_DATA_DEFAULT;
1578 args->ar_commit = 30;
1579 args->ar_statfs_quantum = 30;
1580 args->ar_quota_quantum = 60;
1581 args->ar_errors = GFS2_ERRORS_DEFAULT;
1582 }
1583 fc->fs_private = args;
1584 fc->ops = &gfs2_context_ops;
1585 return 0;
1586 }
1587
set_meta_super(struct super_block * s,struct fs_context * fc)1588 static int set_meta_super(struct super_block *s, struct fs_context *fc)
1589 {
1590 return -EINVAL;
1591 }
1592
test_meta_super(struct super_block * s,struct fs_context * fc)1593 static int test_meta_super(struct super_block *s, struct fs_context *fc)
1594 {
1595 return (fc->sget_key == s->s_bdev);
1596 }
1597
gfs2_meta_get_tree(struct fs_context * fc)1598 static int gfs2_meta_get_tree(struct fs_context *fc)
1599 {
1600 struct super_block *s;
1601 struct gfs2_sbd *sdp;
1602 struct path path;
1603 int error;
1604
1605 if (!fc->source || !*fc->source)
1606 return -EINVAL;
1607
1608 error = kern_path(fc->source, LOOKUP_FOLLOW, &path);
1609 if (error) {
1610 pr_warn("path_lookup on %s returned error %d\n",
1611 fc->source, error);
1612 return error;
1613 }
1614 fc->fs_type = &gfs2_fs_type;
1615 fc->sget_key = path.dentry->d_sb->s_bdev;
1616 s = sget_fc(fc, test_meta_super, set_meta_super);
1617 path_put(&path);
1618 if (IS_ERR(s)) {
1619 pr_warn("gfs2 mount does not exist\n");
1620 return PTR_ERR(s);
1621 }
1622 if ((fc->sb_flags ^ s->s_flags) & SB_RDONLY) {
1623 deactivate_locked_super(s);
1624 return -EBUSY;
1625 }
1626 sdp = s->s_fs_info;
1627 fc->root = dget(sdp->sd_master_dir);
1628 return 0;
1629 }
1630
1631 static const struct fs_context_operations gfs2_meta_context_ops = {
1632 .free = gfs2_fc_free,
1633 .get_tree = gfs2_meta_get_tree,
1634 };
1635
gfs2_meta_init_fs_context(struct fs_context * fc)1636 static int gfs2_meta_init_fs_context(struct fs_context *fc)
1637 {
1638 int ret = gfs2_init_fs_context(fc);
1639
1640 if (ret)
1641 return ret;
1642
1643 fc->ops = &gfs2_meta_context_ops;
1644 return 0;
1645 }
1646
gfs2_kill_sb(struct super_block * sb)1647 static void gfs2_kill_sb(struct super_block *sb)
1648 {
1649 struct gfs2_sbd *sdp = sb->s_fs_info;
1650
1651 if (sdp == NULL) {
1652 kill_block_super(sb);
1653 return;
1654 }
1655
1656 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SYNC | GFS2_LFC_KILL_SB);
1657 dput(sdp->sd_root_dir);
1658 dput(sdp->sd_master_dir);
1659 sdp->sd_root_dir = NULL;
1660 sdp->sd_master_dir = NULL;
1661 shrink_dcache_sb(sb);
1662 kill_block_super(sb);
1663 }
1664
1665 struct file_system_type gfs2_fs_type = {
1666 .name = "gfs2",
1667 .fs_flags = FS_REQUIRES_DEV,
1668 .init_fs_context = gfs2_init_fs_context,
1669 .parameters = gfs2_fs_parameters,
1670 .kill_sb = gfs2_kill_sb,
1671 .owner = THIS_MODULE,
1672 };
1673 MODULE_ALIAS_FS("gfs2");
1674
1675 struct file_system_type gfs2meta_fs_type = {
1676 .name = "gfs2meta",
1677 .fs_flags = FS_REQUIRES_DEV,
1678 .init_fs_context = gfs2_meta_init_fs_context,
1679 .owner = THIS_MODULE,
1680 };
1681 MODULE_ALIAS_FS("gfs2meta");
1682
