aboutsummaryrefslogtreecommitdiffstats
path: root/fs/gfs2/super.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/gfs2/super.c')
-rw-r--r--fs/gfs2/super.c944
1 files changed, 944 insertions, 0 deletions
diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c
new file mode 100644
index 000000000000..d37f203e133b
--- /dev/null
+++ b/fs/gfs2/super.c
@@ -0,0 +1,944 @@
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 <asm/semaphore.h>
16
17#include "gfs2.h"
18#include "bmap.h"
19#include "dir.h"
20#include "format.h"
21#include "glock.h"
22#include "glops.h"
23#include "inode.h"
24#include "log.h"
25#include "meta_io.h"
26#include "quota.h"
27#include "recovery.h"
28#include "rgrp.h"
29#include "super.h"
30#include "trans.h"
31#include "unlinked.h"
32
33/**
34 * gfs2_tune_init - Fill a gfs2_tune structure with default values
35 * @gt: tune
36 *
37 */
38
39void gfs2_tune_init(struct gfs2_tune *gt)
40{
41 spin_lock_init(&gt->gt_spin);
42
43 gt->gt_ilimit = 100;
44 gt->gt_ilimit_tries = 3;
45 gt->gt_ilimit_min = 1;
46 gt->gt_demote_secs = 300;
47 gt->gt_incore_log_blocks = 1024;
48 gt->gt_log_flush_secs = 60;
49 gt->gt_jindex_refresh_secs = 60;
50 gt->gt_scand_secs = 15;
51 gt->gt_recoverd_secs = 60;
52 gt->gt_logd_secs = 1;
53 gt->gt_quotad_secs = 5;
54 gt->gt_inoded_secs = 15;
55 gt->gt_quota_simul_sync = 64;
56 gt->gt_quota_warn_period = 10;
57 gt->gt_quota_scale_num = 1;
58 gt->gt_quota_scale_den = 1;
59 gt->gt_quota_cache_secs = 300;
60 gt->gt_quota_quantum = 60;
61 gt->gt_atime_quantum = 3600;
62 gt->gt_new_files_jdata = 0;
63 gt->gt_new_files_directio = 0;
64 gt->gt_max_atomic_write = 4 << 20;
65 gt->gt_max_readahead = 1 << 18;
66 gt->gt_lockdump_size = 131072;
67 gt->gt_stall_secs = 600;
68 gt->gt_complain_secs = 10;
69 gt->gt_reclaim_limit = 5000;
70 gt->gt_entries_per_readdir = 32;
71 gt->gt_prefetch_secs = 10;
72 gt->gt_greedy_default = HZ / 10;
73 gt->gt_greedy_quantum = HZ / 40;
74 gt->gt_greedy_max = HZ / 4;
75 gt->gt_statfs_quantum = 30;
76 gt->gt_statfs_slow = 0;
77}
78
79/**
80 * gfs2_check_sb - Check superblock
81 * @sdp: the filesystem
82 * @sb: The superblock
83 * @silent: Don't print a message if the check fails
84 *
85 * Checks the version code of the FS is one that we understand how to
86 * read and that the sizes of the various on-disk structures have not
87 * changed.
88 */
89
90int gfs2_check_sb(struct gfs2_sbd *sdp, struct gfs2_sb *sb, int silent)
91{
92 unsigned int x;
93
94 if (sb->sb_header.mh_magic != GFS2_MAGIC ||
95 sb->sb_header.mh_type != GFS2_METATYPE_SB) {
96 if (!silent)
97 printk("GFS2: not a GFS2 filesystem\n");
98 return -EINVAL;
99 }
100
101 /* If format numbers match exactly, we're done. */
102
103 if (sb->sb_fs_format == GFS2_FORMAT_FS &&
104 sb->sb_multihost_format == GFS2_FORMAT_MULTI)
105 return 0;
106
107 if (sb->sb_fs_format != GFS2_FORMAT_FS) {
108 for (x = 0; gfs2_old_fs_formats[x]; x++)
109 if (gfs2_old_fs_formats[x] == sb->sb_fs_format)
110 break;
111
112 if (!gfs2_old_fs_formats[x]) {
113 printk("GFS2: code version (%u, %u) is incompatible "
114 "with ondisk format (%u, %u)\n",
115 GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
116 sb->sb_fs_format, sb->sb_multihost_format);
117 printk("GFS2: I don't know how to upgrade this FS\n");
118 return -EINVAL;
119 }
120 }
121
122 if (sb->sb_multihost_format != GFS2_FORMAT_MULTI) {
123 for (x = 0; gfs2_old_multihost_formats[x]; x++)
124 if (gfs2_old_multihost_formats[x] == sb->sb_multihost_format)
125 break;
126
127 if (!gfs2_old_multihost_formats[x]) {
128 printk("GFS2: code version (%u, %u) is incompatible "
129 "with ondisk format (%u, %u)\n",
130 GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
131 sb->sb_fs_format, sb->sb_multihost_format);
132 printk("GFS2: I don't know how to upgrade this FS\n");
133 return -EINVAL;
134 }
135 }
136
137 if (!sdp->sd_args.ar_upgrade) {
138 printk("GFS2: code version (%u, %u) is incompatible "
139 "with ondisk format (%u, %u)\n",
140 GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
141 sb->sb_fs_format, sb->sb_multihost_format);
142 printk("GFS2: Use the \"upgrade\" mount option to upgrade "
143 "the FS\n");
144 printk("GFS2: See the manual for more details\n");
145 return -EINVAL;
146 }
147
148 return 0;
149}
150
151/**
152 * gfs2_read_sb - Read super block
153 * @sdp: The GFS2 superblock
154 * @gl: the glock for the superblock (assumed to be held)
155 * @silent: Don't print message if mount fails
156 *
157 */
158
159int gfs2_read_sb(struct gfs2_sbd *sdp, struct gfs2_glock *gl, int silent)
160{
161 struct buffer_head *bh;
162 uint32_t hash_blocks, ind_blocks, leaf_blocks;
163 uint32_t tmp_blocks;
164 unsigned int x;
165 int error;
166
167 error = gfs2_meta_read(gl, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift,
168 DIO_FORCE | DIO_START | DIO_WAIT, &bh);
169 if (error) {
170 if (!silent)
171 fs_err(sdp, "can't read superblock\n");
172 return error;
173 }
174
175 gfs2_assert(sdp, sizeof(struct gfs2_sb) <= bh->b_size);
176 gfs2_sb_in(&sdp->sd_sb, bh->b_data);
177 brelse(bh);
178
179 error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
180 if (error)
181 return error;
182
183 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
184 GFS2_BASIC_BLOCK_SHIFT;
185 sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
186 sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
187 sizeof(struct gfs2_dinode)) / sizeof(uint64_t);
188 sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
189 sizeof(struct gfs2_meta_header)) / sizeof(uint64_t);
190 sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
191 sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
192 sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
193 sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(uint64_t);
194 sdp->sd_ut_per_block = (sdp->sd_sb.sb_bsize -
195 sizeof(struct gfs2_meta_header)) /
196 sizeof(struct gfs2_unlinked_tag);
197 sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
198 sizeof(struct gfs2_meta_header)) /
199 sizeof(struct gfs2_quota_change);
200
201 /* Compute maximum reservation required to add a entry to a directory */
202
203 hash_blocks = DIV_RU(sizeof(uint64_t) * (1 << GFS2_DIR_MAX_DEPTH),
204 sdp->sd_jbsize);
205
206 ind_blocks = 0;
207 for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
208 tmp_blocks = DIV_RU(tmp_blocks, sdp->sd_inptrs);
209 ind_blocks += tmp_blocks;
210 }
211
212 leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
213
214 sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
215
216 sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
217 sizeof(struct gfs2_dinode);
218 sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
219 for (x = 2;; x++) {
220 uint64_t space, d;
221 uint32_t m;
222
223 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
224 d = space;
225 m = do_div(d, sdp->sd_inptrs);
226
227 if (d != sdp->sd_heightsize[x - 1] || m)
228 break;
229 sdp->sd_heightsize[x] = space;
230 }
231 sdp->sd_max_height = x;
232 gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
233
234 sdp->sd_jheightsize[0] = sdp->sd_sb.sb_bsize -
235 sizeof(struct gfs2_dinode);
236 sdp->sd_jheightsize[1] = sdp->sd_jbsize * sdp->sd_diptrs;
237 for (x = 2;; x++) {
238 uint64_t space, d;
239 uint32_t m;
240
241 space = sdp->sd_jheightsize[x - 1] * sdp->sd_inptrs;
242 d = space;
243 m = do_div(d, sdp->sd_inptrs);
244
245 if (d != sdp->sd_jheightsize[x - 1] || m)
246 break;
247 sdp->sd_jheightsize[x] = space;
248 }
249 sdp->sd_max_jheight = x;
250 gfs2_assert(sdp, sdp->sd_max_jheight <= GFS2_MAX_META_HEIGHT);
251
252 return 0;
253}
254
255int gfs2_do_upgrade(struct gfs2_sbd *sdp, struct gfs2_glock *sb_gl)
256{
257 return 0;
258}
259
260/**
261 * gfs2_jindex_hold - Grab a lock on the jindex
262 * @sdp: The GFS2 superblock
263 * @ji_gh: the holder for the jindex glock
264 *
265 * This is very similar to the gfs2_rindex_hold() function, except that
266 * in general we hold the jindex lock for longer periods of time and
267 * we grab it far less frequently (in general) then the rgrp lock.
268 *
269 * Returns: errno
270 */
271
272int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
273{
274 struct gfs2_inode *dip = sdp->sd_jindex;
275 struct qstr name;
276 char buf[20];
277 struct gfs2_jdesc *jd;
278 int error;
279
280 name.name = buf;
281
282 down(&sdp->sd_jindex_mutex);
283
284 for (;;) {
285 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED,
286 GL_LOCAL_EXCL, ji_gh);
287 if (error)
288 break;
289
290 name.len = sprintf(buf, "journal%u", sdp->sd_journals);
291
292 error = gfs2_dir_search(sdp->sd_jindex, &name, NULL, NULL);
293 if (error == -ENOENT) {
294 error = 0;
295 break;
296 }
297
298 gfs2_glock_dq_uninit(ji_gh);
299
300 if (error)
301 break;
302
303 error = -ENOMEM;
304 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
305 if (!jd)
306 break;
307
308 error = gfs2_lookupi(dip, &name, 1, &jd->jd_inode);
309 if (error) {
310 kfree(jd);
311 break;
312 }
313
314 spin_lock(&sdp->sd_jindex_spin);
315 jd->jd_jid = sdp->sd_journals++;
316 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
317 spin_unlock(&sdp->sd_jindex_spin);
318 }
319
320 up(&sdp->sd_jindex_mutex);
321
322 return error;
323}
324
325/**
326 * gfs2_jindex_free - Clear all the journal index information
327 * @sdp: The GFS2 superblock
328 *
329 */
330
331void gfs2_jindex_free(struct gfs2_sbd *sdp)
332{
333 struct list_head list;
334 struct gfs2_jdesc *jd;
335
336 spin_lock(&sdp->sd_jindex_spin);
337 list_add(&list, &sdp->sd_jindex_list);
338 list_del_init(&sdp->sd_jindex_list);
339 sdp->sd_journals = 0;
340 spin_unlock(&sdp->sd_jindex_spin);
341
342 while (!list_empty(&list)) {
343 jd = list_entry(list.next, struct gfs2_jdesc, jd_list);
344 list_del(&jd->jd_list);
345 gfs2_inode_put(jd->jd_inode);
346 kfree(jd);
347 }
348}
349
350static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid)
351{
352 struct gfs2_jdesc *jd;
353 int found = 0;
354
355 list_for_each_entry(jd, head, jd_list) {
356 if (jd->jd_jid == jid) {
357 found = 1;
358 break;
359 }
360 }
361
362 if (!found)
363 jd = NULL;
364
365 return jd;
366}
367
368struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid)
369{
370 struct gfs2_jdesc *jd;
371
372 spin_lock(&sdp->sd_jindex_spin);
373 jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
374 spin_unlock(&sdp->sd_jindex_spin);
375
376 return jd;
377}
378
379void gfs2_jdesc_make_dirty(struct gfs2_sbd *sdp, unsigned int jid)
380{
381 struct gfs2_jdesc *jd;
382
383 spin_lock(&sdp->sd_jindex_spin);
384 jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
385 if (jd)
386 jd->jd_dirty = 1;
387 spin_unlock(&sdp->sd_jindex_spin);
388}
389
390struct gfs2_jdesc *gfs2_jdesc_find_dirty(struct gfs2_sbd *sdp)
391{
392 struct gfs2_jdesc *jd;
393 int found = 0;
394
395 spin_lock(&sdp->sd_jindex_spin);
396
397 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
398 if (jd->jd_dirty) {
399 jd->jd_dirty = 0;
400 found = 1;
401 break;
402 }
403 }
404 spin_unlock(&sdp->sd_jindex_spin);
405
406 if (!found)
407 jd = NULL;
408
409 return jd;
410}
411
412int gfs2_jdesc_check(struct gfs2_jdesc *jd)
413{
414 struct gfs2_inode *ip = jd->jd_inode;
415 struct gfs2_sbd *sdp = ip->i_sbd;
416 int ar;
417 int error;
418
419 if (ip->i_di.di_size < (8 << 20) ||
420 ip->i_di.di_size > (1 << 30) ||
421 (ip->i_di.di_size & (sdp->sd_sb.sb_bsize - 1))) {
422 gfs2_consist_inode(ip);
423 return -EIO;
424 }
425 jd->jd_blocks = ip->i_di.di_size >> sdp->sd_sb.sb_bsize_shift;
426
427 error = gfs2_write_alloc_required(ip,
428 0, ip->i_di.di_size,
429 &ar);
430 if (!error && ar) {
431 gfs2_consist_inode(ip);
432 error = -EIO;
433 }
434
435 return error;
436}
437
438int gfs2_lookup_master_dir(struct gfs2_sbd *sdp)
439{
440 struct gfs2_glock *gl;
441 int error;
442
443 error = gfs2_glock_get(sdp,
444 sdp->sd_sb.sb_master_dir.no_addr,
445 &gfs2_inode_glops, CREATE, &gl);
446 if (!error) {
447 error = gfs2_inode_get(gl, &sdp->sd_sb.sb_master_dir, CREATE,
448 &sdp->sd_master_dir);
449 gfs2_glock_put(gl);
450 }
451
452 return error;
453}
454
455/**
456 * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
457 * @sdp: the filesystem
458 *
459 * Returns: errno
460 */
461
462int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
463{
464 struct gfs2_glock *j_gl = sdp->sd_jdesc->jd_inode->i_gl;
465 struct gfs2_holder t_gh;
466 struct gfs2_log_header head;
467 int error;
468
469 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED,
470 GL_LOCAL_EXCL | GL_NEVER_RECURSE, &t_gh);
471 if (error)
472 return error;
473
474 gfs2_meta_cache_flush(sdp->sd_jdesc->jd_inode);
475 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA | DIO_DATA);
476
477 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
478 if (error)
479 goto fail;
480
481 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
482 gfs2_consist(sdp);
483 error = -EIO;
484 goto fail;
485 }
486
487 /* Initialize some head of the log stuff */
488 sdp->sd_log_sequence = head.lh_sequence + 1;
489 gfs2_log_pointers_init(sdp, head.lh_blkno);
490
491 error = gfs2_unlinked_init(sdp);
492 if (error)
493 goto fail;
494 error = gfs2_quota_init(sdp);
495 if (error)
496 goto fail_unlinked;
497
498 set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
499
500 gfs2_glock_dq_uninit(&t_gh);
501
502 return 0;
503
504 fail_unlinked:
505 gfs2_unlinked_cleanup(sdp);
506
507 fail:
508 t_gh.gh_flags |= GL_NOCACHE;
509 gfs2_glock_dq_uninit(&t_gh);
510
511 return error;
512}
513
514/**
515 * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
516 * @sdp: the filesystem
517 *
518 * Returns: errno
519 */
520
521int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
522{
523 struct gfs2_holder t_gh;
524 int error;
525
526 gfs2_unlinked_dealloc(sdp);
527 gfs2_quota_sync(sdp);
528 gfs2_statfs_sync(sdp);
529
530 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED,
531 GL_LOCAL_EXCL | GL_NEVER_RECURSE | GL_NOCACHE,
532 &t_gh);
533 if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
534 return error;
535
536 gfs2_meta_syncfs(sdp);
537 gfs2_log_shutdown(sdp);
538
539 clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
540
541 if (t_gh.gh_gl)
542 gfs2_glock_dq_uninit(&t_gh);
543
544 gfs2_unlinked_cleanup(sdp);
545 gfs2_quota_cleanup(sdp);
546
547 return error;
548}
549
550int gfs2_statfs_init(struct gfs2_sbd *sdp)
551{
552 struct gfs2_inode *m_ip = sdp->sd_statfs_inode;
553 struct gfs2_statfs_change *m_sc = &sdp->sd_statfs_master;
554 struct gfs2_inode *l_ip = sdp->sd_sc_inode;
555 struct gfs2_statfs_change *l_sc = &sdp->sd_statfs_local;
556 struct buffer_head *m_bh, *l_bh;
557 struct gfs2_holder gh;
558 int error;
559
560 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
561 &gh);
562 if (error)
563 return error;
564
565 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
566 if (error)
567 goto out;
568
569 if (sdp->sd_args.ar_spectator) {
570 spin_lock(&sdp->sd_statfs_spin);
571 gfs2_statfs_change_in(m_sc, m_bh->b_data +
572 sizeof(struct gfs2_dinode));
573 spin_unlock(&sdp->sd_statfs_spin);
574 } else {
575 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
576 if (error)
577 goto out_m_bh;
578
579 spin_lock(&sdp->sd_statfs_spin);
580 gfs2_statfs_change_in(m_sc, m_bh->b_data +
581 sizeof(struct gfs2_dinode));
582 gfs2_statfs_change_in(l_sc, l_bh->b_data +
583 sizeof(struct gfs2_dinode));
584 spin_unlock(&sdp->sd_statfs_spin);
585
586 brelse(l_bh);
587 }
588
589 out_m_bh:
590 brelse(m_bh);
591
592 out:
593 gfs2_glock_dq_uninit(&gh);
594
595 return 0;
596}
597
598void gfs2_statfs_change(struct gfs2_sbd *sdp, int64_t total, int64_t free,
599 int64_t dinodes)
600{
601 struct gfs2_inode *l_ip = sdp->sd_sc_inode;
602 struct gfs2_statfs_change *l_sc = &sdp->sd_statfs_local;
603 struct buffer_head *l_bh;
604 int error;
605
606 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
607 if (error)
608 return;
609
610 down(&sdp->sd_statfs_mutex);
611 gfs2_trans_add_bh(l_ip->i_gl, l_bh);
612 up(&sdp->sd_statfs_mutex);
613
614 spin_lock(&sdp->sd_statfs_spin);
615 l_sc->sc_total += total;
616 l_sc->sc_free += free;
617 l_sc->sc_dinodes += dinodes;
618 gfs2_statfs_change_out(l_sc, l_bh->b_data +
619 sizeof(struct gfs2_dinode));
620 spin_unlock(&sdp->sd_statfs_spin);
621
622 brelse(l_bh);
623}
624
625int gfs2_statfs_sync(struct gfs2_sbd *sdp)
626{
627 struct gfs2_inode *m_ip = sdp->sd_statfs_inode;
628 struct gfs2_inode *l_ip = sdp->sd_sc_inode;
629 struct gfs2_statfs_change *m_sc = &sdp->sd_statfs_master;
630 struct gfs2_statfs_change *l_sc = &sdp->sd_statfs_local;
631 struct gfs2_holder gh;
632 struct buffer_head *m_bh, *l_bh;
633 int error;
634
635 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
636 &gh);
637 if (error)
638 return error;
639
640 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
641 if (error)
642 goto out;
643
644 spin_lock(&sdp->sd_statfs_spin);
645 gfs2_statfs_change_in(m_sc, m_bh->b_data +
646 sizeof(struct gfs2_dinode));
647 if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) {
648 spin_unlock(&sdp->sd_statfs_spin);
649 goto out_bh;
650 }
651 spin_unlock(&sdp->sd_statfs_spin);
652
653 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
654 if (error)
655 goto out_bh;
656
657 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
658 if (error)
659 goto out_bh2;
660
661 down(&sdp->sd_statfs_mutex);
662 gfs2_trans_add_bh(l_ip->i_gl, l_bh);
663 up(&sdp->sd_statfs_mutex);
664
665 spin_lock(&sdp->sd_statfs_spin);
666 m_sc->sc_total += l_sc->sc_total;
667 m_sc->sc_free += l_sc->sc_free;
668 m_sc->sc_dinodes += l_sc->sc_dinodes;
669 memset(l_sc, 0, sizeof(struct gfs2_statfs_change));
670 memset(l_bh->b_data + sizeof(struct gfs2_dinode),
671 0, sizeof(struct gfs2_statfs_change));
672 spin_unlock(&sdp->sd_statfs_spin);
673
674 gfs2_trans_add_bh(m_ip->i_gl, m_bh);
675 gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
676
677 gfs2_trans_end(sdp);
678
679 out_bh2:
680 brelse(l_bh);
681
682 out_bh:
683 brelse(m_bh);
684
685 out:
686 gfs2_glock_dq_uninit(&gh);
687
688 return error;
689}
690
691/**
692 * gfs2_statfs_i - Do a statfs
693 * @sdp: the filesystem
694 * @sg: the sg structure
695 *
696 * Returns: errno
697 */
698
699int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change *sc)
700{
701 struct gfs2_statfs_change *m_sc = &sdp->sd_statfs_master;
702 struct gfs2_statfs_change *l_sc = &sdp->sd_statfs_local;
703
704 spin_lock(&sdp->sd_statfs_spin);
705
706 *sc = *m_sc;
707 sc->sc_total += l_sc->sc_total;
708 sc->sc_free += l_sc->sc_free;
709 sc->sc_dinodes += l_sc->sc_dinodes;
710
711 spin_unlock(&sdp->sd_statfs_spin);
712
713 if (sc->sc_free < 0)
714 sc->sc_free = 0;
715 if (sc->sc_free > sc->sc_total)
716 sc->sc_free = sc->sc_total;
717 if (sc->sc_dinodes < 0)
718 sc->sc_dinodes = 0;
719
720 return 0;
721}
722
723/**
724 * statfs_fill - fill in the sg for a given RG
725 * @rgd: the RG
726 * @sc: the sc structure
727 *
728 * Returns: 0 on success, -ESTALE if the LVB is invalid
729 */
730
731static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
732 struct gfs2_statfs_change *sc)
733{
734 gfs2_rgrp_verify(rgd);
735 sc->sc_total += rgd->rd_ri.ri_data;
736 sc->sc_free += rgd->rd_rg.rg_free;
737 sc->sc_dinodes += rgd->rd_rg.rg_dinodes;
738 return 0;
739}
740
741/**
742 * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
743 * @sdp: the filesystem
744 * @sc: the sc info that will be returned
745 *
746 * Any error (other than a signal) will cause this routine to fall back
747 * to the synchronous version.
748 *
749 * FIXME: This really shouldn't busy wait like this.
750 *
751 * Returns: errno
752 */
753
754int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change *sc)
755{
756 struct gfs2_holder ri_gh;
757 struct gfs2_rgrpd *rgd_next;
758 struct gfs2_holder *gha, *gh;
759 unsigned int slots = 64;
760 unsigned int x;
761 int done;
762 int error = 0, err;
763
764 memset(sc, 0, sizeof(struct gfs2_statfs_change));
765 gha = kcalloc(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
766 if (!gha)
767 return -ENOMEM;
768
769 error = gfs2_rindex_hold(sdp, &ri_gh);
770 if (error)
771 goto out;
772
773 rgd_next = gfs2_rgrpd_get_first(sdp);
774
775 for (;;) {
776 done = 1;
777
778 for (x = 0; x < slots; x++) {
779 gh = gha + x;
780
781 if (gh->gh_gl && gfs2_glock_poll(gh)) {
782 err = gfs2_glock_wait(gh);
783 if (err) {
784 gfs2_holder_uninit(gh);
785 error = err;
786 } else {
787 if (!error)
788 error = statfs_slow_fill(get_gl2rgd(gh->gh_gl), sc);
789 gfs2_glock_dq_uninit(gh);
790 }
791 }
792
793 if (gh->gh_gl)
794 done = 0;
795 else if (rgd_next && !error) {
796 error = gfs2_glock_nq_init(rgd_next->rd_gl,
797 LM_ST_SHARED,
798 GL_ASYNC,
799 gh);
800 rgd_next = gfs2_rgrpd_get_next(rgd_next);
801 done = 0;
802 }
803
804 if (signal_pending(current))
805 error = -ERESTARTSYS;
806 }
807
808 if (done)
809 break;
810
811 yield();
812 }
813
814 gfs2_glock_dq_uninit(&ri_gh);
815
816 out:
817 kfree(gha);
818
819 return error;
820}
821
822struct lfcc {
823 struct list_head list;
824 struct gfs2_holder gh;
825};
826
827/**
828 * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
829 * journals are clean
830 * @sdp: the file system
831 * @state: the state to put the transaction lock into
832 * @t_gh: the hold on the transaction lock
833 *
834 * Returns: errno
835 */
836
837int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp, struct gfs2_holder *t_gh)
838{
839 struct gfs2_holder ji_gh;
840 struct gfs2_jdesc *jd;
841 struct lfcc *lfcc;
842 LIST_HEAD(list);
843 struct gfs2_log_header lh;
844 int error;
845
846 error = gfs2_jindex_hold(sdp, &ji_gh);
847 if (error)
848 return error;
849
850 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
851 lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
852 if (!lfcc) {
853 error = -ENOMEM;
854 goto out;
855 }
856 error = gfs2_glock_nq_init(jd->jd_inode->i_gl, LM_ST_SHARED, 0,
857 &lfcc->gh);
858 if (error) {
859 kfree(lfcc);
860 goto out;
861 }
862 list_add(&lfcc->list, &list);
863 }
864
865 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_DEFERRED,
866 LM_FLAG_PRIORITY | GL_NEVER_RECURSE | GL_NOCACHE,
867 t_gh);
868
869 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
870 error = gfs2_jdesc_check(jd);
871 if (error)
872 break;
873 error = gfs2_find_jhead(jd, &lh);
874 if (error)
875 break;
876 if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
877 error = -EBUSY;
878 break;
879 }
880 }
881
882 if (error)
883 gfs2_glock_dq_uninit(t_gh);
884
885 out:
886 while (!list_empty(&list)) {
887 lfcc = list_entry(list.next, struct lfcc, list);
888 list_del(&lfcc->list);
889 gfs2_glock_dq_uninit(&lfcc->gh);
890 kfree(lfcc);
891 }
892 gfs2_glock_dq_uninit(&ji_gh);
893
894 return error;
895}
896
897/**
898 * gfs2_freeze_fs - freezes the file system
899 * @sdp: the file system
900 *
901 * This function flushes data and meta data for all machines by
902 * aquiring the transaction log exclusively. All journals are
903 * ensured to be in a clean state as well.
904 *
905 * Returns: errno
906 */
907
908int gfs2_freeze_fs(struct gfs2_sbd *sdp)
909{
910 int error = 0;
911
912 down(&sdp->sd_freeze_lock);
913
914 if (!sdp->sd_freeze_count++) {
915 error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh);
916 if (error)
917 sdp->sd_freeze_count--;
918 }
919
920 up(&sdp->sd_freeze_lock);
921
922 return error;
923}
924
925/**
926 * gfs2_unfreeze_fs - unfreezes the file system
927 * @sdp: the file system
928 *
929 * This function allows the file system to proceed by unlocking
930 * the exclusively held transaction lock. Other GFS2 nodes are
931 * now free to acquire the lock shared and go on with their lives.
932 *
933 */
934
935void gfs2_unfreeze_fs(struct gfs2_sbd *sdp)
936{
937 down(&sdp->sd_freeze_lock);
938
939 if (sdp->sd_freeze_count && !--sdp->sd_freeze_count)
940 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
941
942 up(&sdp->sd_freeze_lock);
943}
944
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-29 03:02:38 -0500