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-rw-r--r--fs/gfs2/super.c950
1 files changed, 950 insertions, 0 deletions
diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c
new file mode 100644
index 000000000000..a4da649d086f
--- /dev/null
+++ b/fs/gfs2/super.c
@@ -0,0 +1,950 @@
1/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
4 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
7 * of the GNU General Public License v.2.
8 */
9
10#include <linux/sched.h>
11#include <linux/slab.h>
12#include <linux/spinlock.h>
13#include <linux/completion.h>
14#include <linux/buffer_head.h>
15#include <linux/crc32.h>
16#include <linux/gfs2_ondisk.h>
17#include <asm/semaphore.h>
18
19#include "gfs2.h"
20#include "lm_interface.h"
21#include "incore.h"
22#include "bmap.h"
23#include "dir.h"
24#include "format.h"
25#include "glock.h"
26#include "glops.h"
27#include "inode.h"
28#include "log.h"
29#include "meta_io.h"
30#include "quota.h"
31#include "recovery.h"
32#include "rgrp.h"
33#include "super.h"
34#include "trans.h"
35#include "unlinked.h"
36#include "util.h"
37
38/**
39 * gfs2_tune_init - Fill a gfs2_tune structure with default values
40 * @gt: tune
41 *
42 */
43
44void gfs2_tune_init(struct gfs2_tune *gt)
45{
46 spin_lock_init(&gt->gt_spin);
47
48 gt->gt_ilimit = 100;
49 gt->gt_ilimit_tries = 3;
50 gt->gt_ilimit_min = 1;
51 gt->gt_demote_secs = 300;
52 gt->gt_incore_log_blocks = 1024;
53 gt->gt_log_flush_secs = 60;
54 gt->gt_jindex_refresh_secs = 60;
55 gt->gt_scand_secs = 15;
56 gt->gt_recoverd_secs = 60;
57 gt->gt_logd_secs = 1;
58 gt->gt_quotad_secs = 5;
59 gt->gt_inoded_secs = 15;
60 gt->gt_quota_simul_sync = 64;
61 gt->gt_quota_warn_period = 10;
62 gt->gt_quota_scale_num = 1;
63 gt->gt_quota_scale_den = 1;
64 gt->gt_quota_cache_secs = 300;
65 gt->gt_quota_quantum = 60;
66 gt->gt_atime_quantum = 3600;
67 gt->gt_new_files_jdata = 0;
68 gt->gt_new_files_directio = 0;
69 gt->gt_max_atomic_write = 4 << 20;
70 gt->gt_max_readahead = 1 << 18;
71 gt->gt_lockdump_size = 131072;
72 gt->gt_stall_secs = 600;
73 gt->gt_complain_secs = 10;
74 gt->gt_reclaim_limit = 5000;
75 gt->gt_entries_per_readdir = 32;
76 gt->gt_prefetch_secs = 10;
77 gt->gt_greedy_default = HZ / 10;
78 gt->gt_greedy_quantum = HZ / 40;
79 gt->gt_greedy_max = HZ / 4;
80 gt->gt_statfs_quantum = 30;
81 gt->gt_statfs_slow = 0;
82}
83
84/**
85 * gfs2_check_sb - Check superblock
86 * @sdp: the filesystem
87 * @sb: The superblock
88 * @silent: Don't print a message if the check fails
89 *
90 * Checks the version code of the FS is one that we understand how to
91 * read and that the sizes of the various on-disk structures have not
92 * changed.
93 */
94
95int gfs2_check_sb(struct gfs2_sbd *sdp, struct gfs2_sb *sb, int silent)
96{
97 unsigned int x;
98
99 if (sb->sb_header.mh_magic != GFS2_MAGIC ||
100 sb->sb_header.mh_type != GFS2_METATYPE_SB) {
101 if (!silent)
102 printk(KERN_WARNING "GFS2: not a GFS2 filesystem\n");
103 return -EINVAL;
104 }
105
106 /* If format numbers match exactly, we're done. */
107
108 if (sb->sb_fs_format == GFS2_FORMAT_FS &&
109 sb->sb_multihost_format == GFS2_FORMAT_MULTI)
110 return 0;
111
112 if (sb->sb_fs_format != GFS2_FORMAT_FS) {
113 for (x = 0; gfs2_old_fs_formats[x]; x++)
114 if (gfs2_old_fs_formats[x] == sb->sb_fs_format)
115 break;
116
117 if (!gfs2_old_fs_formats[x]) {
118 printk(KERN_WARNING
119 "GFS2: code version (%u, %u) is incompatible "
120 "with ondisk format (%u, %u)\n",
121 GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
122 sb->sb_fs_format, sb->sb_multihost_format);
123 printk(KERN_WARNING
124 "GFS2: I don't know how to upgrade this FS\n");
125 return -EINVAL;
126 }
127 }
128
129 if (sb->sb_multihost_format != GFS2_FORMAT_MULTI) {
130 for (x = 0; gfs2_old_multihost_formats[x]; x++)
131 if (gfs2_old_multihost_formats[x] ==
132 sb->sb_multihost_format)
133 break;
134
135 if (!gfs2_old_multihost_formats[x]) {
136 printk(KERN_WARNING
137 "GFS2: code version (%u, %u) is incompatible "
138 "with ondisk format (%u, %u)\n",
139 GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
140 sb->sb_fs_format, sb->sb_multihost_format);
141 printk(KERN_WARNING
142 "GFS2: I don't know how to upgrade this FS\n");
143 return -EINVAL;
144 }
145 }
146
147 if (!sdp->sd_args.ar_upgrade) {
148 printk(KERN_WARNING
149 "GFS2: code version (%u, %u) is incompatible "
150 "with ondisk format (%u, %u)\n",
151 GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
152 sb->sb_fs_format, sb->sb_multihost_format);
153 printk(KERN_INFO
154 "GFS2: Use the \"upgrade\" mount option to upgrade "
155 "the FS\n");
156 printk(KERN_INFO "GFS2: See the manual for more details\n");
157 return -EINVAL;
158 }
159
160 return 0;
161}
162
163/**
164 * gfs2_read_sb - Read super block
165 * @sdp: The GFS2 superblock
166 * @gl: the glock for the superblock (assumed to be held)
167 * @silent: Don't print message if mount fails
168 *
169 */
170
171int gfs2_read_sb(struct gfs2_sbd *sdp, struct gfs2_glock *gl, int silent)
172{
173 struct buffer_head *bh;
174 uint32_t hash_blocks, ind_blocks, leaf_blocks;
175 uint32_t tmp_blocks;
176 unsigned int x;
177 int error;
178
179 error = gfs2_meta_read(gl, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift,
180 DIO_FORCE | DIO_START | DIO_WAIT, &bh);
181 if (error) {
182 if (!silent)
183 fs_err(sdp, "can't read superblock\n");
184 return error;
185 }
186
187 gfs2_assert(sdp, sizeof(struct gfs2_sb) <= bh->b_size);
188 gfs2_sb_in(&sdp->sd_sb, bh->b_data);
189 brelse(bh);
190
191 error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
192 if (error)
193 return error;
194
195 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
196 GFS2_BASIC_BLOCK_SHIFT;
197 sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
198 sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
199 sizeof(struct gfs2_dinode)) / sizeof(uint64_t);
200 sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
201 sizeof(struct gfs2_meta_header)) / sizeof(uint64_t);
202 sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
203 sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
204 sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
205 sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(uint64_t);
206 sdp->sd_ut_per_block = (sdp->sd_sb.sb_bsize -
207 sizeof(struct gfs2_meta_header)) /
208 sizeof(struct gfs2_unlinked_tag);
209 sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
210 sizeof(struct gfs2_meta_header)) /
211 sizeof(struct gfs2_quota_change);
212
213 /* Compute maximum reservation required to add a entry to a directory */
214
215 hash_blocks = DIV_ROUND_UP(sizeof(uint64_t) * (1 << GFS2_DIR_MAX_DEPTH),
216 sdp->sd_jbsize);
217
218 ind_blocks = 0;
219 for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
220 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
221 ind_blocks += tmp_blocks;
222 }
223
224 leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
225
226 sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
227
228 sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
229 sizeof(struct gfs2_dinode);
230 sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
231 for (x = 2;; x++) {
232 uint64_t space, d;
233 uint32_t m;
234
235 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
236 d = space;
237 m = do_div(d, sdp->sd_inptrs);
238
239 if (d != sdp->sd_heightsize[x - 1] || m)
240 break;
241 sdp->sd_heightsize[x] = space;
242 }
243 sdp->sd_max_height = x;
244 gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
245
246 sdp->sd_jheightsize[0] = sdp->sd_sb.sb_bsize -
247 sizeof(struct gfs2_dinode);
248 sdp->sd_jheightsize[1] = sdp->sd_jbsize * sdp->sd_diptrs;
249 for (x = 2;; x++) {
250 uint64_t space, d;
251 uint32_t m;
252
253 space = sdp->sd_jheightsize[x - 1] * sdp->sd_inptrs;
254 d = space;
255 m = do_div(d, sdp->sd_inptrs);
256
257 if (d != sdp->sd_jheightsize[x - 1] || m)
258 break;
259 sdp->sd_jheightsize[x] = space;
260 }
261 sdp->sd_max_jheight = x;
262 gfs2_assert(sdp, sdp->sd_max_jheight <= GFS2_MAX_META_HEIGHT);
263
264 return 0;
265}
266
267int gfs2_do_upgrade(struct gfs2_sbd *sdp, struct gfs2_glock *sb_gl)
268{
269 return 0;
270}
271
272/**
273 * gfs2_jindex_hold - Grab a lock on the jindex
274 * @sdp: The GFS2 superblock
275 * @ji_gh: the holder for the jindex glock
276 *
277 * This is very similar to the gfs2_rindex_hold() function, except that
278 * in general we hold the jindex lock for longer periods of time and
279 * we grab it far less frequently (in general) then the rgrp lock.
280 *
281 * Returns: errno
282 */
283
284int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
285{
286 struct gfs2_inode *dip = sdp->sd_jindex->u.generic_ip;
287 struct qstr name;
288 char buf[20];
289 struct gfs2_jdesc *jd;
290 int error;
291
292 name.name = buf;
293
294 mutex_lock(&sdp->sd_jindex_mutex);
295
296 for (;;) {
297 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED,
298 GL_LOCAL_EXCL, ji_gh);
299 if (error)
300 break;
301
302 name.len = sprintf(buf, "journal%u", sdp->sd_journals);
303 name.hash = gfs2_disk_hash(name.name, name.len);
304
305 error = gfs2_dir_search(sdp->sd_jindex,
306 &name, NULL, NULL);
307 if (error == -ENOENT) {
308 error = 0;
309 break;
310 }
311
312 gfs2_glock_dq_uninit(ji_gh);
313
314 if (error)
315 break;
316
317 error = -ENOMEM;
318 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
319 if (!jd)
320 break;
321
322 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1, NULL);
323 if (!jd->jd_inode || IS_ERR(jd->jd_inode)) {
324 if (!jd->jd_inode)
325 error = -ENOENT;
326 else
327 error = PTR_ERR(jd->jd_inode);
328 kfree(jd);
329 break;
330 }
331
332 spin_lock(&sdp->sd_jindex_spin);
333 jd->jd_jid = sdp->sd_journals++;
334 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
335 spin_unlock(&sdp->sd_jindex_spin);
336 }
337
338 mutex_unlock(&sdp->sd_jindex_mutex);
339
340 return error;
341}
342
343/**
344 * gfs2_jindex_free - Clear all the journal index information
345 * @sdp: The GFS2 superblock
346 *
347 */
348
349void gfs2_jindex_free(struct gfs2_sbd *sdp)
350{
351 struct list_head list;
352 struct gfs2_jdesc *jd;
353
354 spin_lock(&sdp->sd_jindex_spin);
355 list_add(&list, &sdp->sd_jindex_list);
356 list_del_init(&sdp->sd_jindex_list);
357 sdp->sd_journals = 0;
358 spin_unlock(&sdp->sd_jindex_spin);
359
360 while (!list_empty(&list)) {
361 jd = list_entry(list.next, struct gfs2_jdesc, jd_list);
362 list_del(&jd->jd_list);
363 iput(jd->jd_inode);
364 kfree(jd);
365 }
366}
367
368static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid)
369{
370 struct gfs2_jdesc *jd;
371 int found = 0;
372
373 list_for_each_entry(jd, head, jd_list) {
374 if (jd->jd_jid == jid) {
375 found = 1;
376 break;
377 }
378 }
379
380 if (!found)
381 jd = NULL;
382
383 return jd;
384}
385
386struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid)
387{
388 struct gfs2_jdesc *jd;
389
390 spin_lock(&sdp->sd_jindex_spin);
391 jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
392 spin_unlock(&sdp->sd_jindex_spin);
393
394 return jd;
395}
396
397void gfs2_jdesc_make_dirty(struct gfs2_sbd *sdp, unsigned int jid)
398{
399 struct gfs2_jdesc *jd;
400
401 spin_lock(&sdp->sd_jindex_spin);
402 jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
403 if (jd)
404 jd->jd_dirty = 1;
405 spin_unlock(&sdp->sd_jindex_spin);
406}
407
408struct gfs2_jdesc *gfs2_jdesc_find_dirty(struct gfs2_sbd *sdp)
409{
410 struct gfs2_jdesc *jd;
411 int found = 0;
412
413 spin_lock(&sdp->sd_jindex_spin);
414
415 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
416 if (jd->jd_dirty) {
417 jd->jd_dirty = 0;
418 found = 1;
419 break;
420 }
421 }
422 spin_unlock(&sdp->sd_jindex_spin);
423
424 if (!found)
425 jd = NULL;
426
427 return jd;
428}
429
430int gfs2_jdesc_check(struct gfs2_jdesc *jd)
431{
432 struct gfs2_inode *ip = jd->jd_inode->u.generic_ip;
433 struct gfs2_sbd *sdp = ip->i_sbd;
434 int ar;
435 int error;
436
437 if (ip->i_di.di_size < (8 << 20) ||
438 ip->i_di.di_size > (1 << 30) ||
439 (ip->i_di.di_size & (sdp->sd_sb.sb_bsize - 1))) {
440 gfs2_consist_inode(ip);
441 return -EIO;
442 }
443 jd->jd_blocks = ip->i_di.di_size >> sdp->sd_sb.sb_bsize_shift;
444
445 error = gfs2_write_alloc_required(ip,
446 0, ip->i_di.di_size,
447 &ar);
448 if (!error && ar) {
449 gfs2_consist_inode(ip);
450 error = -EIO;
451 }
452
453 return error;
454}
455
456/**
457 * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
458 * @sdp: the filesystem
459 *
460 * Returns: errno
461 */
462
463int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
464{
465 struct gfs2_inode *ip = sdp->sd_jdesc->jd_inode->u.generic_ip;
466 struct gfs2_glock *j_gl = ip->i_gl;
467 struct gfs2_holder t_gh;
468 struct gfs2_log_header head;
469 int error;
470
471 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED,
472 GL_LOCAL_EXCL | GL_NEVER_RECURSE, &t_gh);
473 if (error)
474 return error;
475
476 gfs2_meta_cache_flush(ip);
477 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA | DIO_DATA);
478
479 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
480 if (error)
481 goto fail;
482
483 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
484 gfs2_consist(sdp);
485 error = -EIO;
486 goto fail;
487 }
488
489 /* Initialize some head of the log stuff */
490 sdp->sd_log_sequence = head.lh_sequence + 1;
491 gfs2_log_pointers_init(sdp, head.lh_blkno);
492
493 error = gfs2_unlinked_init(sdp);
494 if (error)
495 goto fail;
496 error = gfs2_quota_init(sdp);
497 if (error)
498 goto fail_unlinked;
499
500 set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
501
502 gfs2_glock_dq_uninit(&t_gh);
503
504 return 0;
505
506 fail_unlinked:
507 gfs2_unlinked_cleanup(sdp);
508
509 fail:
510 t_gh.gh_flags |= GL_NOCACHE;
511 gfs2_glock_dq_uninit(&t_gh);
512
513 return error;
514}
515
516/**
517 * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
518 * @sdp: the filesystem
519 *
520 * Returns: errno
521 */
522
523int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
524{
525 struct gfs2_holder t_gh;
526 int error;
527
528 gfs2_unlinked_dealloc(sdp);
529 gfs2_quota_sync(sdp);
530 gfs2_statfs_sync(sdp);
531
532 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED,
533 GL_LOCAL_EXCL | GL_NEVER_RECURSE | GL_NOCACHE,
534 &t_gh);
535 if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
536 return error;
537
538 gfs2_meta_syncfs(sdp);
539 gfs2_log_shutdown(sdp);
540
541 clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
542
543 if (t_gh.gh_gl)
544 gfs2_glock_dq_uninit(&t_gh);
545
546 gfs2_unlinked_cleanup(sdp);
547 gfs2_quota_cleanup(sdp);
548
549 return error;
550}
551
552int gfs2_statfs_init(struct gfs2_sbd *sdp)
553{
554 struct gfs2_inode *m_ip = sdp->sd_statfs_inode->u.generic_ip;
555 struct gfs2_statfs_change *m_sc = &sdp->sd_statfs_master;
556 struct gfs2_inode *l_ip = sdp->sd_sc_inode->u.generic_ip;
557 struct gfs2_statfs_change *l_sc = &sdp->sd_statfs_local;
558 struct buffer_head *m_bh, *l_bh;
559 struct gfs2_holder gh;
560 int error;
561
562 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
563 &gh);
564 if (error)
565 return error;
566
567 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
568 if (error)
569 goto out;
570
571 if (sdp->sd_args.ar_spectator) {
572 spin_lock(&sdp->sd_statfs_spin);
573 gfs2_statfs_change_in(m_sc, m_bh->b_data +
574 sizeof(struct gfs2_dinode));
575 spin_unlock(&sdp->sd_statfs_spin);
576 } else {
577 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
578 if (error)
579 goto out_m_bh;
580
581 spin_lock(&sdp->sd_statfs_spin);
582 gfs2_statfs_change_in(m_sc, m_bh->b_data +
583 sizeof(struct gfs2_dinode));
584 gfs2_statfs_change_in(l_sc, l_bh->b_data +
585 sizeof(struct gfs2_dinode));
586 spin_unlock(&sdp->sd_statfs_spin);
587
588 brelse(l_bh);
589 }
590
591 out_m_bh:
592 brelse(m_bh);
593
594 out:
595 gfs2_glock_dq_uninit(&gh);
596
597 return 0;
598}
599
600void gfs2_statfs_change(struct gfs2_sbd *sdp, int64_t total, int64_t free,
601 int64_t dinodes)
602{
603 struct gfs2_inode *l_ip = sdp->sd_sc_inode->u.generic_ip;
604 struct gfs2_statfs_change *l_sc = &sdp->sd_statfs_local;
605 struct buffer_head *l_bh;
606 int error;
607
608 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
609 if (error)
610 return;
611
612 mutex_lock(&sdp->sd_statfs_mutex);
613 gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
614 mutex_unlock(&sdp->sd_statfs_mutex);
615
616 spin_lock(&sdp->sd_statfs_spin);
617 l_sc->sc_total += total;
618 l_sc->sc_free += free;
619 l_sc->sc_dinodes += dinodes;
620 gfs2_statfs_change_out(l_sc, l_bh->b_data +
621 sizeof(struct gfs2_dinode));
622 spin_unlock(&sdp->sd_statfs_spin);
623
624 brelse(l_bh);
625}
626
627int gfs2_statfs_sync(struct gfs2_sbd *sdp)
628{
629 struct gfs2_inode *m_ip = sdp->sd_statfs_inode->u.generic_ip;
630 struct gfs2_inode *l_ip = sdp->sd_sc_inode->u.generic_ip;
631 struct gfs2_statfs_change *m_sc = &sdp->sd_statfs_master;
632 struct gfs2_statfs_change *l_sc = &sdp->sd_statfs_local;
633 struct gfs2_holder gh;
634 struct buffer_head *m_bh, *l_bh;
635 int error;
636
637 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
638 &gh);
639 if (error)
640 return error;
641
642 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
643 if (error)
644 goto out;
645
646 spin_lock(&sdp->sd_statfs_spin);
647 gfs2_statfs_change_in(m_sc, m_bh->b_data +
648 sizeof(struct gfs2_dinode));
649 if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) {
650 spin_unlock(&sdp->sd_statfs_spin);
651 goto out_bh;
652 }
653 spin_unlock(&sdp->sd_statfs_spin);
654
655 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
656 if (error)
657 goto out_bh;
658
659 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
660 if (error)
661 goto out_bh2;
662
663 mutex_lock(&sdp->sd_statfs_mutex);
664 gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
665 mutex_unlock(&sdp->sd_statfs_mutex);
666
667 spin_lock(&sdp->sd_statfs_spin);
668 m_sc->sc_total += l_sc->sc_total;
669 m_sc->sc_free += l_sc->sc_free;
670 m_sc->sc_dinodes += l_sc->sc_dinodes;
671 memset(l_sc, 0, sizeof(struct gfs2_statfs_change));
672 memset(l_bh->b_data + sizeof(struct gfs2_dinode),
673 0, sizeof(struct gfs2_statfs_change));
674 spin_unlock(&sdp->sd_statfs_spin);
675
676 gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
677 gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
678
679 gfs2_trans_end(sdp);
680
681 out_bh2:
682 brelse(l_bh);
683
684 out_bh:
685 brelse(m_bh);
686
687 out:
688 gfs2_glock_dq_uninit(&gh);
689
690 return error;
691}
692
693/**
694 * gfs2_statfs_i - Do a statfs
695 * @sdp: the filesystem
696 * @sg: the sg structure
697 *
698 * Returns: errno
699 */
700
701int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change *sc)
702{
703 struct gfs2_statfs_change *m_sc = &sdp->sd_statfs_master;
704 struct gfs2_statfs_change *l_sc = &sdp->sd_statfs_local;
705
706 spin_lock(&sdp->sd_statfs_spin);
707
708 *sc = *m_sc;
709 sc->sc_total += l_sc->sc_total;
710 sc->sc_free += l_sc->sc_free;
711 sc->sc_dinodes += l_sc->sc_dinodes;
712
713 spin_unlock(&sdp->sd_statfs_spin);
714
715 if (sc->sc_free < 0)
716 sc->sc_free = 0;
717 if (sc->sc_free > sc->sc_total)
718 sc->sc_free = sc->sc_total;
719 if (sc->sc_dinodes < 0)
720 sc->sc_dinodes = 0;
721
722 return 0;
723}
724
725/**
726 * statfs_fill - fill in the sg for a given RG
727 * @rgd: the RG
728 * @sc: the sc structure
729 *
730 * Returns: 0 on success, -ESTALE if the LVB is invalid
731 */
732
733static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
734 struct gfs2_statfs_change *sc)
735{
736 gfs2_rgrp_verify(rgd);
737 sc->sc_total += rgd->rd_ri.ri_data;
738 sc->sc_free += rgd->rd_rg.rg_free;
739 sc->sc_dinodes += rgd->rd_rg.rg_dinodes;
740 return 0;
741}
742
743/**
744 * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
745 * @sdp: the filesystem
746 * @sc: the sc info that will be returned
747 *
748 * Any error (other than a signal) will cause this routine to fall back
749 * to the synchronous version.
750 *
751 * FIXME: This really shouldn't busy wait like this.
752 *
753 * Returns: errno
754 */
755
756int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change *sc)
757{
758 struct gfs2_holder ri_gh;
759 struct gfs2_rgrpd *rgd_next;
760 struct gfs2_holder *gha, *gh;
761 unsigned int slots = 64;
762 unsigned int x;
763 int done;
764 int error = 0, err;
765
766 memset(sc, 0, sizeof(struct gfs2_statfs_change));
767 gha = kcalloc(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
768 if (!gha)
769 return -ENOMEM;
770
771 error = gfs2_rindex_hold(sdp, &ri_gh);
772 if (error)
773 goto out;
774
775 rgd_next = gfs2_rgrpd_get_first(sdp);
776
777 for (;;) {
778 done = 1;
779
780 for (x = 0; x < slots; x++) {
781 gh = gha + x;
782
783 if (gh->gh_gl && gfs2_glock_poll(gh)) {
784 err = gfs2_glock_wait(gh);
785 if (err) {
786 gfs2_holder_uninit(gh);
787 error = err;
788 } else {
789 if (!error)
790 error = statfs_slow_fill(
791 gh->gh_gl->gl_object, sc);
792 gfs2_glock_dq_uninit(gh);
793 }
794 }
795
796 if (gh->gh_gl)
797 done = 0;
798 else if (rgd_next && !error) {
799 error = gfs2_glock_nq_init(rgd_next->rd_gl,
800 LM_ST_SHARED,
801 GL_ASYNC,
802 gh);
803 rgd_next = gfs2_rgrpd_get_next(rgd_next);
804 done = 0;
805 }
806
807 if (signal_pending(current))
808 error = -ERESTARTSYS;
809 }
810
811 if (done)
812 break;
813
814 yield();
815 }
816
817 gfs2_glock_dq_uninit(&ri_gh);
818
819 out:
820 kfree(gha);
821
822 return error;
823}
824
825struct lfcc {
826 struct list_head list;
827 struct gfs2_holder gh;
828};
829
830/**
831 * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
832 * journals are clean
833 * @sdp: the file system
834 * @state: the state to put the transaction lock into
835 * @t_gh: the hold on the transaction lock
836 *
837 * Returns: errno
838 */
839
840int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp, struct gfs2_holder *t_gh)
841{
842 struct gfs2_inode *ip;
843 struct gfs2_holder ji_gh;
844 struct gfs2_jdesc *jd;
845 struct lfcc *lfcc;
846 LIST_HEAD(list);
847 struct gfs2_log_header lh;
848 int error;
849
850 error = gfs2_jindex_hold(sdp, &ji_gh);
851 if (error)
852 return error;
853
854 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
855 lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
856 if (!lfcc) {
857 error = -ENOMEM;
858 goto out;
859 }
860 ip = jd->jd_inode->u.generic_ip;
861 error = gfs2_glock_nq_init(ip->i_gl,
862 LM_ST_SHARED, 0,
863 &lfcc->gh);
864 if (error) {
865 kfree(lfcc);
866 goto out;
867 }
868 list_add(&lfcc->list, &list);
869 }
870
871 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_DEFERRED,
872 LM_FLAG_PRIORITY | GL_NEVER_RECURSE | GL_NOCACHE,
873 t_gh);
874
875 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
876 error = gfs2_jdesc_check(jd);
877 if (error)
878 break;
879 error = gfs2_find_jhead(jd, &lh);
880 if (error)
881 break;
882 if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
883 error = -EBUSY;
884 break;
885 }
886 }
887
888 if (error)
889 gfs2_glock_dq_uninit(t_gh);
890
891 out:
892 while (!list_empty(&list)) {
893 lfcc = list_entry(list.next, struct lfcc, list);
894 list_del(&lfcc->list);
895 gfs2_glock_dq_uninit(&lfcc->gh);
896 kfree(lfcc);
897 }
898 gfs2_glock_dq_uninit(&ji_gh);
899
900 return error;
901}
902
903/**
904 * gfs2_freeze_fs - freezes the file system
905 * @sdp: the file system
906 *
907 * This function flushes data and meta data for all machines by
908 * aquiring the transaction log exclusively. All journals are
909 * ensured to be in a clean state as well.
910 *
911 * Returns: errno
912 */
913
914int gfs2_freeze_fs(struct gfs2_sbd *sdp)
915{
916 int error = 0;
917
918 mutex_lock(&sdp->sd_freeze_lock);
919
920 if (!sdp->sd_freeze_count++) {
921 error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh);
922 if (error)
923 sdp->sd_freeze_count--;
924 }
925
926 mutex_unlock(&sdp->sd_freeze_lock);
927
928 return error;
929}
930
931/**
932 * gfs2_unfreeze_fs - unfreezes the file system
933 * @sdp: the file system
934 *
935 * This function allows the file system to proceed by unlocking
936 * the exclusively held transaction lock. Other GFS2 nodes are
937 * now free to acquire the lock shared and go on with their lives.
938 *
939 */
940
941void gfs2_unfreeze_fs(struct gfs2_sbd *sdp)
942{
943 mutex_lock(&sdp->sd_freeze_lock);
944
945 if (sdp->sd_freeze_count && !--sdp->sd_freeze_count)
946 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
947
948 mutex_unlock(&sdp->sd_freeze_lock);
949}
950
generated by cgit v1.2.2 (git 2.25.0) at 2025-02-23 12:11:55 -0500