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Merge git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
[wrt350n-kernel.git] / fs / gfs2 / super.c
blobef0562c3bc71986705dab6c7593f0f29c9908da4
1 /*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2007 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 version 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 <linux/bio.h>
18 #include <linux/lm_interface.h>
19
20 #include "gfs2.h"
21 #include "incore.h"
22 #include "bmap.h"
23 #include "dir.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 "util.h"
35
36 static const u32 gfs2_old_fs_formats[] = {
37 0
38 };
39
40 static const u32 gfs2_old_multihost_formats[] = {
41 0
42 };
43
44 /**
45 * gfs2_tune_init - Fill a gfs2_tune structure with default values
46 * @gt: tune
47 *
48 */
49
50 void gfs2_tune_init(struct gfs2_tune *gt)
51 {
52 spin_lock_init(&gt->gt_spin);
53
54 gt->gt_demote_secs = 300;
55 gt->gt_incore_log_blocks = 1024;
56 gt->gt_log_flush_secs = 60;
57 gt->gt_recoverd_secs = 60;
58 gt->gt_logd_secs = 1;
59 gt->gt_quotad_secs = 5;
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_readahead = 1 << 18;
70 gt->gt_stall_secs = 600;
71 gt->gt_complain_secs = 10;
72 gt->gt_statfs_quantum = 30;
73 gt->gt_statfs_slow = 0;
74 }
75
76 /**
77 * gfs2_check_sb - Check superblock
78 * @sdp: the filesystem
79 * @sb: The superblock
80 * @silent: Don't print a message if the check fails
81 *
82 * Checks the version code of the FS is one that we understand how to
83 * read and that the sizes of the various on-disk structures have not
84 * changed.
85 */
86
87 int gfs2_check_sb(struct gfs2_sbd *sdp, struct gfs2_sb_host *sb, int silent)
88 {
89 unsigned int x;
90
91 if (sb->sb_magic != GFS2_MAGIC ||
92 sb->sb_type != GFS2_METATYPE_SB) {
93 if (!silent)
94 printk(KERN_WARNING "GFS2: not a GFS2 filesystem\n");
95 return -EINVAL;
96 }
97
98 /* If format numbers match exactly, we're done. */
99
100 if (sb->sb_fs_format == GFS2_FORMAT_FS &&
101 sb->sb_multihost_format == GFS2_FORMAT_MULTI)
102 return 0;
103
104 if (sb->sb_fs_format != GFS2_FORMAT_FS) {
105 for (x = 0; gfs2_old_fs_formats[x]; x++)
106 if (gfs2_old_fs_formats[x] == sb->sb_fs_format)
107 break;
108
109 if (!gfs2_old_fs_formats[x]) {
110 printk(KERN_WARNING
111 "GFS2: code version (%u, %u) is incompatible "
112 "with ondisk format (%u, %u)\n",
113 GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
114 sb->sb_fs_format, sb->sb_multihost_format);
115 printk(KERN_WARNING
116 "GFS2: I don't know how to upgrade this FS\n");
117 return -EINVAL;
118 }
119 }
120
121 if (sb->sb_multihost_format != GFS2_FORMAT_MULTI) {
122 for (x = 0; gfs2_old_multihost_formats[x]; x++)
123 if (gfs2_old_multihost_formats[x] ==
124 sb->sb_multihost_format)
125 break;
126
127 if (!gfs2_old_multihost_formats[x]) {
128 printk(KERN_WARNING
129 "GFS2: code version (%u, %u) is incompatible "
130 "with ondisk format (%u, %u)\n",
131 GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
132 sb->sb_fs_format, sb->sb_multihost_format);
133 printk(KERN_WARNING
134 "GFS2: I don't know how to upgrade this FS\n");
135 return -EINVAL;
136 }
137 }
138
139 if (!sdp->sd_args.ar_upgrade) {
140 printk(KERN_WARNING
141 "GFS2: code version (%u, %u) is incompatible "
142 "with ondisk format (%u, %u)\n",
143 GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
144 sb->sb_fs_format, sb->sb_multihost_format);
145 printk(KERN_INFO
146 "GFS2: Use the \"upgrade\" mount option to upgrade "
147 "the FS\n");
148 printk(KERN_INFO "GFS2: See the manual for more details\n");
149 return -EINVAL;
150 }
151
152 return 0;
153 }
154
155
156 static void end_bio_io_page(struct bio *bio, int error)
157 {
158 struct page *page = bio->bi_private;
159
160 if (!error)
161 SetPageUptodate(page);
162 else
163 printk(KERN_WARNING "gfs2: error %d reading superblock\n", error);
164 unlock_page(page);
165 }
166
167 static void gfs2_sb_in(struct gfs2_sb_host *sb, const void *buf)
168 {
169 const struct gfs2_sb *str = buf;
170
171 sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic);
172 sb->sb_type = be32_to_cpu(str->sb_header.mh_type);
173 sb->sb_format = be32_to_cpu(str->sb_header.mh_format);
174 sb->sb_fs_format = be32_to_cpu(str->sb_fs_format);
175 sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format);
176 sb->sb_bsize = be32_to_cpu(str->sb_bsize);
177 sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift);
178 sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr);
179 sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino);
180 sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr);
181 sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino);
182
183 memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN);
184 memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN);
185 }
186
187 /**
188 * gfs2_read_super - Read the gfs2 super block from disk
189 * @sdp: The GFS2 super block
190 * @sector: The location of the super block
191 * @error: The error code to return
192 *
193 * This uses the bio functions to read the super block from disk
194 * because we want to be 100% sure that we never read cached data.
195 * A super block is read twice only during each GFS2 mount and is
196 * never written to by the filesystem. The first time its read no
197 * locks are held, and the only details which are looked at are those
198 * relating to the locking protocol. Once locking is up and working,
199 * the sb is read again under the lock to establish the location of
200 * the master directory (contains pointers to journals etc) and the
201 * root directory.
202 *
203 * Returns: 0 on success or error
204 */
205
206 int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector)
207 {
208 struct super_block *sb = sdp->sd_vfs;
209 struct gfs2_sb *p;
210 struct page *page;
211 struct bio *bio;
212
213 page = alloc_page(GFP_KERNEL);
214 if (unlikely(!page))
215 return -ENOBUFS;
216
217 ClearPageUptodate(page);
218 ClearPageDirty(page);
219 lock_page(page);
220
221 bio = bio_alloc(GFP_KERNEL, 1);
222 if (unlikely(!bio)) {
223 __free_page(page);
224 return -ENOBUFS;
225 }
226
227 bio->bi_sector = sector * (sb->s_blocksize >> 9);
228 bio->bi_bdev = sb->s_bdev;
229 bio_add_page(bio, page, PAGE_SIZE, 0);
230
231 bio->bi_end_io = end_bio_io_page;
232 bio->bi_private = page;
233 submit_bio(READ_SYNC | (1 << BIO_RW_META), bio);
234 wait_on_page_locked(page);
235 bio_put(bio);
236 if (!PageUptodate(page)) {
237 __free_page(page);
238 return -EIO;
239 }
240 p = kmap(page);
241 gfs2_sb_in(&sdp->sd_sb, p);
242 kunmap(page);
243 __free_page(page);
244 return 0;
245 }
246
247 /**
248 * gfs2_read_sb - Read super block
249 * @sdp: The GFS2 superblock
250 * @gl: the glock for the superblock (assumed to be held)
251 * @silent: Don't print message if mount fails
252 *
253 */
254
255 int gfs2_read_sb(struct gfs2_sbd *sdp, struct gfs2_glock *gl, int silent)
256 {
257 u32 hash_blocks, ind_blocks, leaf_blocks;
258 u32 tmp_blocks;
259 unsigned int x;
260 int error;
261
262 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift);
263 if (error) {
264 if (!silent)
265 fs_err(sdp, "can't read superblock\n");
266 return error;
267 }
268
269 error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
270 if (error)
271 return error;
272
273 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
274 GFS2_BASIC_BLOCK_SHIFT;
275 sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
276 sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
277 sizeof(struct gfs2_dinode)) / sizeof(u64);
278 sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
279 sizeof(struct gfs2_meta_header)) / sizeof(u64);
280 sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
281 sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
282 sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
283 sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64);
284 sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
285 sizeof(struct gfs2_meta_header)) /
286 sizeof(struct gfs2_quota_change);
287
288 /* Compute maximum reservation required to add a entry to a directory */
289
290 hash_blocks = DIV_ROUND_UP(sizeof(u64) * (1 << GFS2_DIR_MAX_DEPTH),
291 sdp->sd_jbsize);
292
293 ind_blocks = 0;
294 for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
295 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
296 ind_blocks += tmp_blocks;
297 }
298
299 leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
300
301 sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
302
303 sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
304 sizeof(struct gfs2_dinode);
305 sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
306 for (x = 2;; x++) {
307 u64 space, d;
308 u32 m;
309
310 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
311 d = space;
312 m = do_div(d, sdp->sd_inptrs);
313
314 if (d != sdp->sd_heightsize[x - 1] || m)
315 break;
316 sdp->sd_heightsize[x] = space;
317 }
318 sdp->sd_max_height = x;
319 gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
320
321 sdp->sd_jheightsize[0] = sdp->sd_sb.sb_bsize -
322 sizeof(struct gfs2_dinode);
323 sdp->sd_jheightsize[1] = sdp->sd_jbsize * sdp->sd_diptrs;
324 for (x = 2;; x++) {
325 u64 space, d;
326 u32 m;
327
328 space = sdp->sd_jheightsize[x - 1] * sdp->sd_inptrs;
329 d = space;
330 m = do_div(d, sdp->sd_inptrs);
331
332 if (d != sdp->sd_jheightsize[x - 1] || m)
333 break;
334 sdp->sd_jheightsize[x] = space;
335 }
336 sdp->sd_max_jheight = x;
337 gfs2_assert(sdp, sdp->sd_max_jheight <= GFS2_MAX_META_HEIGHT);
338
339 return 0;
340 }
341
342 /**
343 * gfs2_jindex_hold - Grab a lock on the jindex
344 * @sdp: The GFS2 superblock
345 * @ji_gh: the holder for the jindex glock
346 *
347 * This is very similar to the gfs2_rindex_hold() function, except that
348 * in general we hold the jindex lock for longer periods of time and
349 * we grab it far less frequently (in general) then the rgrp lock.
350 *
351 * Returns: errno
352 */
353
354 int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
355 {
356 struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex);
357 struct qstr name;
358 char buf[20];
359 struct gfs2_jdesc *jd;
360 int error;
361
362 name.name = buf;
363
364 mutex_lock(&sdp->sd_jindex_mutex);
365
366 for (;;) {
367 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh);
368 if (error)
369 break;
370
371 name.len = sprintf(buf, "journal%u", sdp->sd_journals);
372 name.hash = gfs2_disk_hash(name.name, name.len);
373
374 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL);
375 if (error == -ENOENT) {
376 error = 0;
377 break;
378 }
379
380 gfs2_glock_dq_uninit(ji_gh);
381
382 if (error)
383 break;
384
385 error = -ENOMEM;
386 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
387 if (!jd)
388 break;
389
390 INIT_LIST_HEAD(&jd->extent_list);
391 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1, NULL);
392 if (!jd->jd_inode || IS_ERR(jd->jd_inode)) {
393 if (!jd->jd_inode)
394 error = -ENOENT;
395 else
396 error = PTR_ERR(jd->jd_inode);
397 kfree(jd);
398 break;
399 }
400
401 spin_lock(&sdp->sd_jindex_spin);
402 jd->jd_jid = sdp->sd_journals++;
403 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
404 spin_unlock(&sdp->sd_jindex_spin);
405 }
406
407 mutex_unlock(&sdp->sd_jindex_mutex);
408
409 return error;
410 }
411
412 /**
413 * gfs2_jindex_free - Clear all the journal index information
414 * @sdp: The GFS2 superblock
415 *
416 */
417
418 void gfs2_jindex_free(struct gfs2_sbd *sdp)
419 {
420 struct list_head list, *head;
421 struct gfs2_jdesc *jd;
422 struct gfs2_journal_extent *jext;
423
424 spin_lock(&sdp->sd_jindex_spin);
425 list_add(&list, &sdp->sd_jindex_list);
426 list_del_init(&sdp->sd_jindex_list);
427 sdp->sd_journals = 0;
428 spin_unlock(&sdp->sd_jindex_spin);
429
430 while (!list_empty(&list)) {
431 jd = list_entry(list.next, struct gfs2_jdesc, jd_list);
432 head = &jd->extent_list;
433 while (!list_empty(head)) {
434 jext = list_entry(head->next,
435 struct gfs2_journal_extent,
436 extent_list);
437 list_del(&jext->extent_list);
438 kfree(jext);
439 }
440 list_del(&jd->jd_list);
441 iput(jd->jd_inode);
442 kfree(jd);
443 }
444 }
445
446 static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid)
447 {
448 struct gfs2_jdesc *jd;
449 int found = 0;
450
451 list_for_each_entry(jd, head, jd_list) {
452 if (jd->jd_jid == jid) {
453 found = 1;
454 break;
455 }
456 }
457
458 if (!found)
459 jd = NULL;
460
461 return jd;
462 }
463
464 struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid)
465 {
466 struct gfs2_jdesc *jd;
467
468 spin_lock(&sdp->sd_jindex_spin);
469 jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
470 spin_unlock(&sdp->sd_jindex_spin);
471
472 return jd;
473 }
474
475 void gfs2_jdesc_make_dirty(struct gfs2_sbd *sdp, unsigned int jid)
476 {
477 struct gfs2_jdesc *jd;
478
479 spin_lock(&sdp->sd_jindex_spin);
480 jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
481 if (jd)
482 jd->jd_dirty = 1;
483 spin_unlock(&sdp->sd_jindex_spin);
484 }
485
486 struct gfs2_jdesc *gfs2_jdesc_find_dirty(struct gfs2_sbd *sdp)
487 {
488 struct gfs2_jdesc *jd;
489 int found = 0;
490
491 spin_lock(&sdp->sd_jindex_spin);
492
493 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
494 if (jd->jd_dirty) {
495 jd->jd_dirty = 0;
496 found = 1;
497 break;
498 }
499 }
500 spin_unlock(&sdp->sd_jindex_spin);
501
502 if (!found)
503 jd = NULL;
504
505 return jd;
506 }
507
508 int gfs2_jdesc_check(struct gfs2_jdesc *jd)
509 {
510 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
511 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
512 int ar;
513 int error;
514
515 if (ip->i_di.di_size < (8 << 20) || ip->i_di.di_size > (1 << 30) ||
516 (ip->i_di.di_size & (sdp->sd_sb.sb_bsize - 1))) {
517 gfs2_consist_inode(ip);
518 return -EIO;
519 }
520 jd->jd_blocks = ip->i_di.di_size >> sdp->sd_sb.sb_bsize_shift;
521
522 error = gfs2_write_alloc_required(ip, 0, ip->i_di.di_size, &ar);
523 if (!error && ar) {
524 gfs2_consist_inode(ip);
525 error = -EIO;
526 }
527
528 return error;
529 }
530
531 /**
532 * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
533 * @sdp: the filesystem
534 *
535 * Returns: errno
536 */
537
538 int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
539 {
540 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
541 struct gfs2_glock *j_gl = ip->i_gl;
542 struct gfs2_holder t_gh;
543 struct gfs2_log_header_host head;
544 int error;
545
546 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &t_gh);
547 if (error)
548 return error;
549
550 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
551
552 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
553 if (error)
554 goto fail;
555
556 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
557 gfs2_consist(sdp);
558 error = -EIO;
559 goto fail;
560 }
561
562 /* Initialize some head of the log stuff */
563 sdp->sd_log_sequence = head.lh_sequence + 1;
564 gfs2_log_pointers_init(sdp, head.lh_blkno);
565
566 error = gfs2_quota_init(sdp);
567 if (error)
568 goto fail;
569
570 set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
571
572 gfs2_glock_dq_uninit(&t_gh);
573
574 return 0;
575
576 fail:
577 t_gh.gh_flags |= GL_NOCACHE;
578 gfs2_glock_dq_uninit(&t_gh);
579
580 return error;
581 }
582
583 /**
584 * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
585 * @sdp: the filesystem
586 *
587 * Returns: errno
588 */
589
590 int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
591 {
592 struct gfs2_holder t_gh;
593 int error;
594
595 gfs2_quota_sync(sdp);
596 gfs2_statfs_sync(sdp);
597
598 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, GL_NOCACHE,
599 &t_gh);
600 if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
601 return error;
602
603 gfs2_meta_syncfs(sdp);
604 gfs2_log_shutdown(sdp);
605
606 clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
607
608 if (t_gh.gh_gl)
609 gfs2_glock_dq_uninit(&t_gh);
610
611 gfs2_quota_cleanup(sdp);
612
613 return error;
614 }
615
616 static void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf)
617 {
618 const struct gfs2_statfs_change *str = buf;
619
620 sc->sc_total = be64_to_cpu(str->sc_total);
621 sc->sc_free = be64_to_cpu(str->sc_free);
622 sc->sc_dinodes = be64_to_cpu(str->sc_dinodes);
623 }
624
625 static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf)
626 {
627 struct gfs2_statfs_change *str = buf;
628
629 str->sc_total = cpu_to_be64(sc->sc_total);
630 str->sc_free = cpu_to_be64(sc->sc_free);
631 str->sc_dinodes = cpu_to_be64(sc->sc_dinodes);
632 }
633
634 int gfs2_statfs_init(struct gfs2_sbd *sdp)
635 {
636 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
637 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
638 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
639 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
640 struct buffer_head *m_bh, *l_bh;
641 struct gfs2_holder gh;
642 int error;
643
644 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
645 &gh);
646 if (error)
647 return error;
648
649 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
650 if (error)
651 goto out;
652
653 if (sdp->sd_args.ar_spectator) {
654 spin_lock(&sdp->sd_statfs_spin);
655 gfs2_statfs_change_in(m_sc, m_bh->b_data +
656 sizeof(struct gfs2_dinode));
657 spin_unlock(&sdp->sd_statfs_spin);
658 } else {
659 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
660 if (error)
661 goto out_m_bh;
662
663 spin_lock(&sdp->sd_statfs_spin);
664 gfs2_statfs_change_in(m_sc, m_bh->b_data +
665 sizeof(struct gfs2_dinode));
666 gfs2_statfs_change_in(l_sc, l_bh->b_data +
667 sizeof(struct gfs2_dinode));
668 spin_unlock(&sdp->sd_statfs_spin);
669
670 brelse(l_bh);
671 }
672
673 out_m_bh:
674 brelse(m_bh);
675 out:
676 gfs2_glock_dq_uninit(&gh);
677 return 0;
678 }
679
680 void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free,
681 s64 dinodes)
682 {
683 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
684 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
685 struct buffer_head *l_bh;
686 int error;
687
688 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
689 if (error)
690 return;
691
692 gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
693
694 spin_lock(&sdp->sd_statfs_spin);
695 l_sc->sc_total += total;
696 l_sc->sc_free += free;
697 l_sc->sc_dinodes += dinodes;
698 gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode));
699 spin_unlock(&sdp->sd_statfs_spin);
700
701 brelse(l_bh);
702 }
703
704 int gfs2_statfs_sync(struct gfs2_sbd *sdp)
705 {
706 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
707 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
708 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
709 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
710 struct gfs2_holder gh;
711 struct buffer_head *m_bh, *l_bh;
712 int error;
713
714 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
715 &gh);
716 if (error)
717 return error;
718
719 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
720 if (error)
721 goto out;
722
723 spin_lock(&sdp->sd_statfs_spin);
724 gfs2_statfs_change_in(m_sc, m_bh->b_data +
725 sizeof(struct gfs2_dinode));
726 if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) {
727 spin_unlock(&sdp->sd_statfs_spin);
728 goto out_bh;
729 }
730 spin_unlock(&sdp->sd_statfs_spin);
731
732 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
733 if (error)
734 goto out_bh;
735
736 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
737 if (error)
738 goto out_bh2;
739
740 gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
741
742 spin_lock(&sdp->sd_statfs_spin);
743 m_sc->sc_total += l_sc->sc_total;
744 m_sc->sc_free += l_sc->sc_free;
745 m_sc->sc_dinodes += l_sc->sc_dinodes;
746 memset(l_sc, 0, sizeof(struct gfs2_statfs_change));
747 memset(l_bh->b_data + sizeof(struct gfs2_dinode),
748 0, sizeof(struct gfs2_statfs_change));
749 spin_unlock(&sdp->sd_statfs_spin);
750
751 gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
752 gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
753
754 gfs2_trans_end(sdp);
755
756 out_bh2:
757 brelse(l_bh);
758 out_bh:
759 brelse(m_bh);
760 out:
761 gfs2_glock_dq_uninit(&gh);
762 return error;
763 }
764
765 /**
766 * gfs2_statfs_i - Do a statfs
767 * @sdp: the filesystem
768 * @sg: the sg structure
769 *
770 * Returns: errno
771 */
772
773 int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
774 {
775 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
776 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
777
778 spin_lock(&sdp->sd_statfs_spin);
779
780 *sc = *m_sc;
781 sc->sc_total += l_sc->sc_total;
782 sc->sc_free += l_sc->sc_free;
783 sc->sc_dinodes += l_sc->sc_dinodes;
784
785 spin_unlock(&sdp->sd_statfs_spin);
786
787 if (sc->sc_free < 0)
788 sc->sc_free = 0;
789 if (sc->sc_free > sc->sc_total)
790 sc->sc_free = sc->sc_total;
791 if (sc->sc_dinodes < 0)
792 sc->sc_dinodes = 0;
793
794 return 0;
795 }
796
797 /**
798 * statfs_fill - fill in the sg for a given RG
799 * @rgd: the RG
800 * @sc: the sc structure
801 *
802 * Returns: 0 on success, -ESTALE if the LVB is invalid
803 */
804
805 static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
806 struct gfs2_statfs_change_host *sc)
807 {
808 gfs2_rgrp_verify(rgd);
809 sc->sc_total += rgd->rd_data;
810 sc->sc_free += rgd->rd_rg.rg_free;
811 sc->sc_dinodes += rgd->rd_rg.rg_dinodes;
812 return 0;
813 }
814
815 /**
816 * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
817 * @sdp: the filesystem
818 * @sc: the sc info that will be returned
819 *
820 * Any error (other than a signal) will cause this routine to fall back
821 * to the synchronous version.
822 *
823 * FIXME: This really shouldn't busy wait like this.
824 *
825 * Returns: errno
826 */
827
828 int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
829 {
830 struct gfs2_holder ri_gh;
831 struct gfs2_rgrpd *rgd_next;
832 struct gfs2_holder *gha, *gh;
833 unsigned int slots = 64;
834 unsigned int x;
835 int done;
836 int error = 0, err;
837
838 memset(sc, 0, sizeof(struct gfs2_statfs_change_host));
839 gha = kcalloc(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
840 if (!gha)
841 return -ENOMEM;
842
843 error = gfs2_rindex_hold(sdp, &ri_gh);
844 if (error)
845 goto out;
846
847 rgd_next = gfs2_rgrpd_get_first(sdp);
848
849 for (;;) {
850 done = 1;
851
852 for (x = 0; x < slots; x++) {
853 gh = gha + x;
854
855 if (gh->gh_gl && gfs2_glock_poll(gh)) {
856 err = gfs2_glock_wait(gh);
857 if (err) {
858 gfs2_holder_uninit(gh);
859 error = err;
860 } else {
861 if (!error)
862 error = statfs_slow_fill(
863 gh->gh_gl->gl_object, sc);
864 gfs2_glock_dq_uninit(gh);
865 }
866 }
867
868 if (gh->gh_gl)
869 done = 0;
870 else if (rgd_next && !error) {
871 error = gfs2_glock_nq_init(rgd_next->rd_gl,
872 LM_ST_SHARED,
873 GL_ASYNC,
874 gh);
875 rgd_next = gfs2_rgrpd_get_next(rgd_next);
876 done = 0;
877 }
878
879 if (signal_pending(current))
880 error = -ERESTARTSYS;
881 }
882
883 if (done)
884 break;
885
886 yield();
887 }
888
889 gfs2_glock_dq_uninit(&ri_gh);
890
891 out:
892 kfree(gha);
893 return error;
894 }
895
896 struct lfcc {
897 struct list_head list;
898 struct gfs2_holder gh;
899 };
900
901 /**
902 * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
903 * journals are clean
904 * @sdp: the file system
905 * @state: the state to put the transaction lock into
906 * @t_gh: the hold on the transaction lock
907 *
908 * Returns: errno
909 */
910
911 static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp,
912 struct gfs2_holder *t_gh)
913 {
914 struct gfs2_inode *ip;
915 struct gfs2_holder ji_gh;
916 struct gfs2_jdesc *jd;
917 struct lfcc *lfcc;
918 LIST_HEAD(list);
919 struct gfs2_log_header_host lh;
920 int error;
921
922 error = gfs2_jindex_hold(sdp, &ji_gh);
923 if (error)
924 return error;
925
926 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
927 lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
928 if (!lfcc) {
929 error = -ENOMEM;
930 goto out;
931 }
932 ip = GFS2_I(jd->jd_inode);
933 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh);
934 if (error) {
935 kfree(lfcc);
936 goto out;
937 }
938 list_add(&lfcc->list, &list);
939 }
940
941 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_DEFERRED,
942 LM_FLAG_PRIORITY | GL_NOCACHE,
943 t_gh);
944
945 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
946 error = gfs2_jdesc_check(jd);
947 if (error)
948 break;
949 error = gfs2_find_jhead(jd, &lh);
950 if (error)
951 break;
952 if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
953 error = -EBUSY;
954 break;
955 }
956 }
957
958 if (error)
959 gfs2_glock_dq_uninit(t_gh);
960
961 out:
962 while (!list_empty(&list)) {
963 lfcc = list_entry(list.next, struct lfcc, list);
964 list_del(&lfcc->list);
965 gfs2_glock_dq_uninit(&lfcc->gh);
966 kfree(lfcc);
967 }
968 gfs2_glock_dq_uninit(&ji_gh);
969 return error;
970 }
971
972 /**
973 * gfs2_freeze_fs - freezes the file system
974 * @sdp: the file system
975 *
976 * This function flushes data and meta data for all machines by
977 * aquiring the transaction log exclusively. All journals are
978 * ensured to be in a clean state as well.
979 *
980 * Returns: errno
981 */
982
983 int gfs2_freeze_fs(struct gfs2_sbd *sdp)
984 {
985 int error = 0;
986
987 mutex_lock(&sdp->sd_freeze_lock);
988
989 if (!sdp->sd_freeze_count++) {
990 error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh);
991 if (error)
992 sdp->sd_freeze_count--;
993 }
994
995 mutex_unlock(&sdp->sd_freeze_lock);
996
997 return error;
998 }
999
1000 /**
1001 * gfs2_unfreeze_fs - unfreezes the file system
1002 * @sdp: the file system
1003 *
1004 * This function allows the file system to proceed by unlocking
1005 * the exclusively held transaction lock. Other GFS2 nodes are
1006 * now free to acquire the lock shared and go on with their lives.
1007 *
1008 */
1009
1010 void gfs2_unfreeze_fs(struct gfs2_sbd *sdp)
1011 {
1012 mutex_lock(&sdp->sd_freeze_lock);
1013
1014 if (sdp->sd_freeze_count && !--sdp->sd_freeze_count)
1015 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
1016
1017 mutex_unlock(&sdp->sd_freeze_lock);
1018 }
1019
WRT350N Kernel Patches