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71cca7629403a2d892b47b39f19aa08a280626a1
[deliverable/linux.git] / fs / gfs2 / super.c
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/gfs2_ondisk.h>
16 #include <asm/semaphore.h>
17
18 #include "gfs2.h"
19 #include "lm_interface.h"
20 #include "incore.h"
21 #include "bmap.h"
22 #include "dir.h"
23 #include "format.h"
24 #include "glock.h"
25 #include "glops.h"
26 #include "inode.h"
27 #include "log.h"
28 #include "meta_io.h"
29 #include "quota.h"
30 #include "recovery.h"
31 #include "rgrp.h"
32 #include "super.h"
33 #include "trans.h"
34 #include "unlinked.h"
35 #include "util.h"
36
37 /**
38 * gfs2_tune_init - Fill a gfs2_tune structure with default values
39 * @gt: tune
40 *
41 */
42
43 void gfs2_tune_init(struct gfs2_tune *gt)
44 {
45 spin_lock_init(&gt->gt_spin);
46
47 gt->gt_ilimit = 100;
48 gt->gt_ilimit_tries = 3;
49 gt->gt_ilimit_min = 1;
50 gt->gt_demote_secs = 300;
51 gt->gt_incore_log_blocks = 1024;
52 gt->gt_log_flush_secs = 60;
53 gt->gt_jindex_refresh_secs = 60;
54 gt->gt_scand_secs = 15;
55 gt->gt_recoverd_secs = 60;
56 gt->gt_logd_secs = 1;
57 gt->gt_quotad_secs = 5;
58 gt->gt_inoded_secs = 15;
59 gt->gt_quota_simul_sync = 64;
60 gt->gt_quota_warn_period = 10;
61 gt->gt_quota_scale_num = 1;
62 gt->gt_quota_scale_den = 1;
63 gt->gt_quota_cache_secs = 300;
64 gt->gt_quota_quantum = 60;
65 gt->gt_atime_quantum = 3600;
66 gt->gt_new_files_jdata = 0;
67 gt->gt_new_files_directio = 0;
68 gt->gt_max_atomic_write = 4 << 20;
69 gt->gt_max_readahead = 1 << 18;
70 gt->gt_lockdump_size = 131072;
71 gt->gt_stall_secs = 600;
72 gt->gt_complain_secs = 10;
73 gt->gt_reclaim_limit = 5000;
74 gt->gt_entries_per_readdir = 32;
75 gt->gt_prefetch_secs = 10;
76 gt->gt_greedy_default = HZ / 10;
77 gt->gt_greedy_quantum = HZ / 40;
78 gt->gt_greedy_max = HZ / 4;
79 gt->gt_statfs_quantum = 30;
80 gt->gt_statfs_slow = 0;
81 }
82
83 /**
84 * gfs2_check_sb - Check superblock
85 * @sdp: the filesystem
86 * @sb: The superblock
87 * @silent: Don't print a message if the check fails
88 *
89 * Checks the version code of the FS is one that we understand how to
90 * read and that the sizes of the various on-disk structures have not
91 * changed.
92 */
93
94 int gfs2_check_sb(struct gfs2_sbd *sdp, struct gfs2_sb *sb, int silent)
95 {
96 unsigned int x;
97
98 if (sb->sb_header.mh_magic != GFS2_MAGIC ||
99 sb->sb_header.mh_type != GFS2_METATYPE_SB) {
100 if (!silent)
101 printk(KERN_WARNING "GFS2: not a GFS2 filesystem\n");
102 return -EINVAL;
103 }
104
105 /* If format numbers match exactly, we're done. */
106
107 if (sb->sb_fs_format == GFS2_FORMAT_FS &&
108 sb->sb_multihost_format == GFS2_FORMAT_MULTI)
109 return 0;
110
111 if (sb->sb_fs_format != GFS2_FORMAT_FS) {
112 for (x = 0; gfs2_old_fs_formats[x]; x++)
113 if (gfs2_old_fs_formats[x] == sb->sb_fs_format)
114 break;
115
116 if (!gfs2_old_fs_formats[x]) {
117 printk(KERN_WARNING
118 "GFS2: code version (%u, %u) is incompatible "
119 "with ondisk format (%u, %u)\n",
120 GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
121 sb->sb_fs_format, sb->sb_multihost_format);
122 printk(KERN_WARNING
123 "GFS2: I don't know how to upgrade this FS\n");
124 return -EINVAL;
125 }
126 }
127
128 if (sb->sb_multihost_format != GFS2_FORMAT_MULTI) {
129 for (x = 0; gfs2_old_multihost_formats[x]; x++)
130 if (gfs2_old_multihost_formats[x] ==
131 sb->sb_multihost_format)
132 break;
133
134 if (!gfs2_old_multihost_formats[x]) {
135 printk(KERN_WARNING
136 "GFS2: code version (%u, %u) is incompatible "
137 "with ondisk format (%u, %u)\n",
138 GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
139 sb->sb_fs_format, sb->sb_multihost_format);
140 printk(KERN_WARNING
141 "GFS2: I don't know how to upgrade this FS\n");
142 return -EINVAL;
143 }
144 }
145
146 if (!sdp->sd_args.ar_upgrade) {
147 printk(KERN_WARNING
148 "GFS2: code version (%u, %u) is incompatible "
149 "with ondisk format (%u, %u)\n",
150 GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
151 sb->sb_fs_format, sb->sb_multihost_format);
152 printk(KERN_INFO
153 "GFS2: Use the \"upgrade\" mount option to upgrade "
154 "the FS\n");
155 printk(KERN_INFO "GFS2: See the manual for more details\n");
156 return -EINVAL;
157 }
158
159 return 0;
160 }
161
162 /**
163 * gfs2_read_sb - Read super block
164 * @sdp: The GFS2 superblock
165 * @gl: the glock for the superblock (assumed to be held)
166 * @silent: Don't print message if mount fails
167 *
168 */
169
170 int gfs2_read_sb(struct gfs2_sbd *sdp, struct gfs2_glock *gl, int silent)
171 {
172 struct buffer_head *bh;
173 uint32_t hash_blocks, ind_blocks, leaf_blocks;
174 uint32_t tmp_blocks;
175 unsigned int x;
176 int error;
177
178 error = gfs2_meta_read(gl, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift,
179 DIO_FORCE | DIO_START | DIO_WAIT, &bh);
180 if (error) {
181 if (!silent)
182 fs_err(sdp, "can't read superblock\n");
183 return error;
184 }
185
186 gfs2_assert(sdp, sizeof(struct gfs2_sb) <= bh->b_size);
187 gfs2_sb_in(&sdp->sd_sb, bh->b_data);
188 brelse(bh);
189
190 error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
191 if (error)
192 return error;
193
194 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
195 GFS2_BASIC_BLOCK_SHIFT;
196 sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
197 sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
198 sizeof(struct gfs2_dinode)) / sizeof(uint64_t);
199 sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
200 sizeof(struct gfs2_meta_header)) / sizeof(uint64_t);
201 sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
202 sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
203 sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
204 sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(uint64_t);
205 sdp->sd_ut_per_block = (sdp->sd_sb.sb_bsize -
206 sizeof(struct gfs2_meta_header)) /
207 sizeof(struct gfs2_unlinked_tag);
208 sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
209 sizeof(struct gfs2_meta_header)) /
210 sizeof(struct gfs2_quota_change);
211
212 /* Compute maximum reservation required to add a entry to a directory */
213
214 hash_blocks = DIV_ROUND_UP(sizeof(uint64_t) * (1 << GFS2_DIR_MAX_DEPTH),
215 sdp->sd_jbsize);
216
217 ind_blocks = 0;
218 for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
219 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
220 ind_blocks += tmp_blocks;
221 }
222
223 leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
224
225 sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
226
227 sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
228 sizeof(struct gfs2_dinode);
229 sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
230 for (x = 2;; x++) {
231 uint64_t space, d;
232 uint32_t m;
233
234 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
235 d = space;
236 m = do_div(d, sdp->sd_inptrs);
237
238 if (d != sdp->sd_heightsize[x - 1] || m)
239 break;
240 sdp->sd_heightsize[x] = space;
241 }
242 sdp->sd_max_height = x;
243 gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
244
245 sdp->sd_jheightsize[0] = sdp->sd_sb.sb_bsize -
246 sizeof(struct gfs2_dinode);
247 sdp->sd_jheightsize[1] = sdp->sd_jbsize * sdp->sd_diptrs;
248 for (x = 2;; x++) {
249 uint64_t space, d;
250 uint32_t m;
251
252 space = sdp->sd_jheightsize[x - 1] * sdp->sd_inptrs;
253 d = space;
254 m = do_div(d, sdp->sd_inptrs);
255
256 if (d != sdp->sd_jheightsize[x - 1] || m)
257 break;
258 sdp->sd_jheightsize[x] = space;
259 }
260 sdp->sd_max_jheight = x;
261 gfs2_assert(sdp, sdp->sd_max_jheight <= GFS2_MAX_META_HEIGHT);
262
263 return 0;
264 }
265
266 int gfs2_do_upgrade(struct gfs2_sbd *sdp, struct gfs2_glock *sb_gl)
267 {
268 return 0;
269 }
270
271 /**
272 * gfs2_jindex_hold - Grab a lock on the jindex
273 * @sdp: The GFS2 superblock
274 * @ji_gh: the holder for the jindex glock
275 *
276 * This is very similar to the gfs2_rindex_hold() function, except that
277 * in general we hold the jindex lock for longer periods of time and
278 * we grab it far less frequently (in general) then the rgrp lock.
279 *
280 * Returns: errno
281 */
282
283 int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
284 {
285 struct gfs2_inode *dip = sdp->sd_jindex->u.generic_ip;
286 struct qstr name;
287 char buf[20];
288 struct gfs2_jdesc *jd;
289 int error;
290
291 name.name = buf;
292
293 mutex_lock(&sdp->sd_jindex_mutex);
294
295 for (;;) {
296 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED,
297 GL_LOCAL_EXCL, ji_gh);
298 if (error)
299 break;
300
301 name.len = sprintf(buf, "journal%u", sdp->sd_journals);
302 name.hash = gfs2_disk_hash(name.name, name.len);
303
304 error = gfs2_dir_search(sdp->sd_jindex,
305 &name, NULL, NULL);
306 if (error == -ENOENT) {
307 error = 0;
308 break;
309 }
310
311 gfs2_glock_dq_uninit(ji_gh);
312
313 if (error)
314 break;
315
316 error = -ENOMEM;
317 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
318 if (!jd)
319 break;
320
321 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1, NULL);
322 if (!jd->jd_inode || IS_ERR(jd->jd_inode)) {
323 if (!jd->jd_inode)
324 error = -ENOENT;
325 else
326 error = PTR_ERR(jd->jd_inode);
327 kfree(jd);
328 break;
329 }
330
331 spin_lock(&sdp->sd_jindex_spin);
332 jd->jd_jid = sdp->sd_journals++;
333 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
334 spin_unlock(&sdp->sd_jindex_spin);
335 }
336
337 mutex_unlock(&sdp->sd_jindex_mutex);
338
339 return error;
340 }
341
342 /**
343 * gfs2_jindex_free - Clear all the journal index information
344 * @sdp: The GFS2 superblock
345 *
346 */
347
348 void gfs2_jindex_free(struct gfs2_sbd *sdp)
349 {
350 struct list_head list;
351 struct gfs2_jdesc *jd;
352
353 spin_lock(&sdp->sd_jindex_spin);
354 list_add(&list, &sdp->sd_jindex_list);
355 list_del_init(&sdp->sd_jindex_list);
356 sdp->sd_journals = 0;
357 spin_unlock(&sdp->sd_jindex_spin);
358
359 while (!list_empty(&list)) {
360 jd = list_entry(list.next, struct gfs2_jdesc, jd_list);
361 list_del(&jd->jd_list);
362 iput(jd->jd_inode);
363 kfree(jd);
364 }
365 }
366
367 static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid)
368 {
369 struct gfs2_jdesc *jd;
370 int found = 0;
371
372 list_for_each_entry(jd, head, jd_list) {
373 if (jd->jd_jid == jid) {
374 found = 1;
375 break;
376 }
377 }
378
379 if (!found)
380 jd = NULL;
381
382 return jd;
383 }
384
385 struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid)
386 {
387 struct gfs2_jdesc *jd;
388
389 spin_lock(&sdp->sd_jindex_spin);
390 jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
391 spin_unlock(&sdp->sd_jindex_spin);
392
393 return jd;
394 }
395
396 void gfs2_jdesc_make_dirty(struct gfs2_sbd *sdp, unsigned int jid)
397 {
398 struct gfs2_jdesc *jd;
399
400 spin_lock(&sdp->sd_jindex_spin);
401 jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
402 if (jd)
403 jd->jd_dirty = 1;
404 spin_unlock(&sdp->sd_jindex_spin);
405 }
406
407 struct gfs2_jdesc *gfs2_jdesc_find_dirty(struct gfs2_sbd *sdp)
408 {
409 struct gfs2_jdesc *jd;
410 int found = 0;
411
412 spin_lock(&sdp->sd_jindex_spin);
413
414 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
415 if (jd->jd_dirty) {
416 jd->jd_dirty = 0;
417 found = 1;
418 break;
419 }
420 }
421 spin_unlock(&sdp->sd_jindex_spin);
422
423 if (!found)
424 jd = NULL;
425
426 return jd;
427 }
428
429 int gfs2_jdesc_check(struct gfs2_jdesc *jd)
430 {
431 struct gfs2_inode *ip = jd->jd_inode->u.generic_ip;
432 struct gfs2_sbd *sdp = ip->i_sbd;
433 int ar;
434 int error;
435
436 if (ip->i_di.di_size < (8 << 20) ||
437 ip->i_di.di_size > (1 << 30) ||
438 (ip->i_di.di_size & (sdp->sd_sb.sb_bsize - 1))) {
439 gfs2_consist_inode(ip);
440 return -EIO;
441 }
442 jd->jd_blocks = ip->i_di.di_size >> sdp->sd_sb.sb_bsize_shift;
443
444 error = gfs2_write_alloc_required(ip,
445 0, ip->i_di.di_size,
446 &ar);
447 if (!error && ar) {
448 gfs2_consist_inode(ip);
449 error = -EIO;
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
462 int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
463 {
464 struct gfs2_inode *ip = sdp->sd_jdesc->jd_inode->u.generic_ip;
465 struct gfs2_glock *j_gl = ip->i_gl;
466 struct gfs2_holder t_gh;
467 struct gfs2_log_header head;
468 int error;
469
470 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED,
471 GL_LOCAL_EXCL | GL_NEVER_RECURSE, &t_gh);
472 if (error)
473 return error;
474
475 gfs2_meta_cache_flush(ip);
476 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA | DIO_DATA);
477
478 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
479 if (error)
480 goto fail;
481
482 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
483 gfs2_consist(sdp);
484 error = -EIO;
485 goto fail;
486 }
487
488 /* Initialize some head of the log stuff */
489 sdp->sd_log_sequence = head.lh_sequence + 1;
490 gfs2_log_pointers_init(sdp, head.lh_blkno);
491
492 error = gfs2_unlinked_init(sdp);
493 if (error)
494 goto fail;
495 error = gfs2_quota_init(sdp);
496 if (error)
497 goto fail_unlinked;
498
499 set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
500
501 gfs2_glock_dq_uninit(&t_gh);
502
503 return 0;
504
505 fail_unlinked:
506 gfs2_unlinked_cleanup(sdp);
507
508 fail:
509 t_gh.gh_flags |= GL_NOCACHE;
510 gfs2_glock_dq_uninit(&t_gh);
511
512 return error;
513 }
514
515 /**
516 * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
517 * @sdp: the filesystem
518 *
519 * Returns: errno
520 */
521
522 int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
523 {
524 struct gfs2_holder t_gh;
525 int error;
526
527 gfs2_unlinked_dealloc(sdp);
528 gfs2_quota_sync(sdp);
529 gfs2_statfs_sync(sdp);
530
531 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED,
532 GL_LOCAL_EXCL | GL_NEVER_RECURSE | GL_NOCACHE,
533 &t_gh);
534 if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
535 return error;
536
537 gfs2_meta_syncfs(sdp);
538 gfs2_log_shutdown(sdp);
539
540 clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
541
542 if (t_gh.gh_gl)
543 gfs2_glock_dq_uninit(&t_gh);
544
545 gfs2_unlinked_cleanup(sdp);
546 gfs2_quota_cleanup(sdp);
547
548 return error;
549 }
550
551 int gfs2_statfs_init(struct gfs2_sbd *sdp)
552 {
553 struct gfs2_inode *m_ip = sdp->sd_statfs_inode->u.generic_ip;
554 struct gfs2_statfs_change *m_sc = &sdp->sd_statfs_master;
555 struct gfs2_inode *l_ip = sdp->sd_sc_inode->u.generic_ip;
556 struct gfs2_statfs_change *l_sc = &sdp->sd_statfs_local;
557 struct buffer_head *m_bh, *l_bh;
558 struct gfs2_holder gh;
559 int error;
560
561 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
562 &gh);
563 if (error)
564 return error;
565
566 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
567 if (error)
568 goto out;
569
570 if (sdp->sd_args.ar_spectator) {
571 spin_lock(&sdp->sd_statfs_spin);
572 gfs2_statfs_change_in(m_sc, m_bh->b_data +
573 sizeof(struct gfs2_dinode));
574 spin_unlock(&sdp->sd_statfs_spin);
575 } else {
576 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
577 if (error)
578 goto out_m_bh;
579
580 spin_lock(&sdp->sd_statfs_spin);
581 gfs2_statfs_change_in(m_sc, m_bh->b_data +
582 sizeof(struct gfs2_dinode));
583 gfs2_statfs_change_in(l_sc, l_bh->b_data +
584 sizeof(struct gfs2_dinode));
585 spin_unlock(&sdp->sd_statfs_spin);
586
587 brelse(l_bh);
588 }
589
590 out_m_bh:
591 brelse(m_bh);
592
593 out:
594 gfs2_glock_dq_uninit(&gh);
595
596 return 0;
597 }
598
599 void gfs2_statfs_change(struct gfs2_sbd *sdp, int64_t total, int64_t free,
600 int64_t dinodes)
601 {
602 struct gfs2_inode *l_ip = sdp->sd_sc_inode->u.generic_ip;
603 struct gfs2_statfs_change *l_sc = &sdp->sd_statfs_local;
604 struct buffer_head *l_bh;
605 int error;
606
607 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
608 if (error)
609 return;
610
611 mutex_lock(&sdp->sd_statfs_mutex);
612 gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
613 mutex_unlock(&sdp->sd_statfs_mutex);
614
615 spin_lock(&sdp->sd_statfs_spin);
616 l_sc->sc_total += total;
617 l_sc->sc_free += free;
618 l_sc->sc_dinodes += dinodes;
619 gfs2_statfs_change_out(l_sc, l_bh->b_data +
620 sizeof(struct gfs2_dinode));
621 spin_unlock(&sdp->sd_statfs_spin);
622
623 brelse(l_bh);
624 }
625
626 int gfs2_statfs_sync(struct gfs2_sbd *sdp)
627 {
628 struct gfs2_inode *m_ip = sdp->sd_statfs_inode->u.generic_ip;
629 struct gfs2_inode *l_ip = sdp->sd_sc_inode->u.generic_ip;
630 struct gfs2_statfs_change *m_sc = &sdp->sd_statfs_master;
631 struct gfs2_statfs_change *l_sc = &sdp->sd_statfs_local;
632 struct gfs2_holder gh;
633 struct buffer_head *m_bh, *l_bh;
634 int error;
635
636 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
637 &gh);
638 if (error)
639 return error;
640
641 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
642 if (error)
643 goto out;
644
645 spin_lock(&sdp->sd_statfs_spin);
646 gfs2_statfs_change_in(m_sc, m_bh->b_data +
647 sizeof(struct gfs2_dinode));
648 if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) {
649 spin_unlock(&sdp->sd_statfs_spin);
650 goto out_bh;
651 }
652 spin_unlock(&sdp->sd_statfs_spin);
653
654 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
655 if (error)
656 goto out_bh;
657
658 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
659 if (error)
660 goto out_bh2;
661
662 mutex_lock(&sdp->sd_statfs_mutex);
663 gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
664 mutex_unlock(&sdp->sd_statfs_mutex);
665
666 spin_lock(&sdp->sd_statfs_spin);
667 m_sc->sc_total += l_sc->sc_total;
668 m_sc->sc_free += l_sc->sc_free;
669 m_sc->sc_dinodes += l_sc->sc_dinodes;
670 memset(l_sc, 0, sizeof(struct gfs2_statfs_change));
671 memset(l_bh->b_data + sizeof(struct gfs2_dinode),
672 0, sizeof(struct gfs2_statfs_change));
673 spin_unlock(&sdp->sd_statfs_spin);
674
675 gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
676 gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
677
678 gfs2_trans_end(sdp);
679
680 out_bh2:
681 brelse(l_bh);
682
683 out_bh:
684 brelse(m_bh);
685
686 out:
687 gfs2_glock_dq_uninit(&gh);
688
689 return error;
690 }
691
692 /**
693 * gfs2_statfs_i - Do a statfs
694 * @sdp: the filesystem
695 * @sg: the sg structure
696 *
697 * Returns: errno
698 */
699
700 int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change *sc)
701 {
702 struct gfs2_statfs_change *m_sc = &sdp->sd_statfs_master;
703 struct gfs2_statfs_change *l_sc = &sdp->sd_statfs_local;
704
705 spin_lock(&sdp->sd_statfs_spin);
706
707 *sc = *m_sc;
708 sc->sc_total += l_sc->sc_total;
709 sc->sc_free += l_sc->sc_free;
710 sc->sc_dinodes += l_sc->sc_dinodes;
711
712 spin_unlock(&sdp->sd_statfs_spin);
713
714 if (sc->sc_free < 0)
715 sc->sc_free = 0;
716 if (sc->sc_free > sc->sc_total)
717 sc->sc_free = sc->sc_total;
718 if (sc->sc_dinodes < 0)
719 sc->sc_dinodes = 0;
720
721 return 0;
722 }
723
724 /**
725 * statfs_fill - fill in the sg for a given RG
726 * @rgd: the RG
727 * @sc: the sc structure
728 *
729 * Returns: 0 on success, -ESTALE if the LVB is invalid
730 */
731
732 static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
733 struct gfs2_statfs_change *sc)
734 {
735 gfs2_rgrp_verify(rgd);
736 sc->sc_total += rgd->rd_ri.ri_data;
737 sc->sc_free += rgd->rd_rg.rg_free;
738 sc->sc_dinodes += rgd->rd_rg.rg_dinodes;
739 return 0;
740 }
741
742 /**
743 * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
744 * @sdp: the filesystem
745 * @sc: the sc info that will be returned
746 *
747 * Any error (other than a signal) will cause this routine to fall back
748 * to the synchronous version.
749 *
750 * FIXME: This really shouldn't busy wait like this.
751 *
752 * Returns: errno
753 */
754
755 int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change *sc)
756 {
757 struct gfs2_holder ri_gh;
758 struct gfs2_rgrpd *rgd_next;
759 struct gfs2_holder *gha, *gh;
760 unsigned int slots = 64;
761 unsigned int x;
762 int done;
763 int error = 0, err;
764
765 memset(sc, 0, sizeof(struct gfs2_statfs_change));
766 gha = kcalloc(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
767 if (!gha)
768 return -ENOMEM;
769
770 error = gfs2_rindex_hold(sdp, &ri_gh);
771 if (error)
772 goto out;
773
774 rgd_next = gfs2_rgrpd_get_first(sdp);
775
776 for (;;) {
777 done = 1;
778
779 for (x = 0; x < slots; x++) {
780 gh = gha + x;
781
782 if (gh->gh_gl && gfs2_glock_poll(gh)) {
783 err = gfs2_glock_wait(gh);
784 if (err) {
785 gfs2_holder_uninit(gh);
786 error = err;
787 } else {
788 if (!error)
789 error = statfs_slow_fill(
790 gh->gh_gl->gl_object, sc);
791 gfs2_glock_dq_uninit(gh);
792 }
793 }
794
795 if (gh->gh_gl)
796 done = 0;
797 else if (rgd_next && !error) {
798 error = gfs2_glock_nq_init(rgd_next->rd_gl,
799 LM_ST_SHARED,
800 GL_ASYNC,
801 gh);
802 rgd_next = gfs2_rgrpd_get_next(rgd_next);
803 done = 0;
804 }
805
806 if (signal_pending(current))
807 error = -ERESTARTSYS;
808 }
809
810 if (done)
811 break;
812
813 yield();
814 }
815
816 gfs2_glock_dq_uninit(&ri_gh);
817
818 out:
819 kfree(gha);
820
821 return error;
822 }
823
824 struct lfcc {
825 struct list_head list;
826 struct gfs2_holder gh;
827 };
828
829 /**
830 * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
831 * journals are clean
832 * @sdp: the file system
833 * @state: the state to put the transaction lock into
834 * @t_gh: the hold on the transaction lock
835 *
836 * Returns: errno
837 */
838
839 int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp, struct gfs2_holder *t_gh)
840 {
841 struct gfs2_inode *ip;
842 struct gfs2_holder ji_gh;
843 struct gfs2_jdesc *jd;
844 struct lfcc *lfcc;
845 LIST_HEAD(list);
846 struct gfs2_log_header lh;
847 int error;
848
849 error = gfs2_jindex_hold(sdp, &ji_gh);
850 if (error)
851 return error;
852
853 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
854 lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
855 if (!lfcc) {
856 error = -ENOMEM;
857 goto out;
858 }
859 ip = jd->jd_inode->u.generic_ip;
860 error = gfs2_glock_nq_init(ip->i_gl,
861 LM_ST_SHARED, 0,
862 &lfcc->gh);
863 if (error) {
864 kfree(lfcc);
865 goto out;
866 }
867 list_add(&lfcc->list, &list);
868 }
869
870 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_DEFERRED,
871 LM_FLAG_PRIORITY | GL_NEVER_RECURSE | GL_NOCACHE,
872 t_gh);
873
874 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
875 error = gfs2_jdesc_check(jd);
876 if (error)
877 break;
878 error = gfs2_find_jhead(jd, &lh);
879 if (error)
880 break;
881 if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
882 error = -EBUSY;
883 break;
884 }
885 }
886
887 if (error)
888 gfs2_glock_dq_uninit(t_gh);
889
890 out:
891 while (!list_empty(&list)) {
892 lfcc = list_entry(list.next, struct lfcc, list);
893 list_del(&lfcc->list);
894 gfs2_glock_dq_uninit(&lfcc->gh);
895 kfree(lfcc);
896 }
897 gfs2_glock_dq_uninit(&ji_gh);
898
899 return error;
900 }
901
902 /**
903 * gfs2_freeze_fs - freezes the file system
904 * @sdp: the file system
905 *
906 * This function flushes data and meta data for all machines by
907 * aquiring the transaction log exclusively. All journals are
908 * ensured to be in a clean state as well.
909 *
910 * Returns: errno
911 */
912
913 int gfs2_freeze_fs(struct gfs2_sbd *sdp)
914 {
915 int error = 0;
916
917 mutex_lock(&sdp->sd_freeze_lock);
918
919 if (!sdp->sd_freeze_count++) {
920 error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh);
921 if (error)
922 sdp->sd_freeze_count--;
923 }
924
925 mutex_unlock(&sdp->sd_freeze_lock);
926
927 return error;
928 }
929
930 /**
931 * gfs2_unfreeze_fs - unfreezes the file system
932 * @sdp: the file system
933 *
934 * This function allows the file system to proceed by unlocking
935 * the exclusively held transaction lock. Other GFS2 nodes are
936 * now free to acquire the lock shared and go on with their lives.
937 *
938 */
939
940 void gfs2_unfreeze_fs(struct gfs2_sbd *sdp)
941 {
942 mutex_lock(&sdp->sd_freeze_lock);
943
944 if (sdp->sd_freeze_count && !--sdp->sd_freeze_count)
945 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
946
947 mutex_unlock(&sdp->sd_freeze_lock);
948 }
949
Linux kernel - Deliverables
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