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USB: drivers/usb/misc/sisusbvga/sisusb.c: kill two unused variables
[linux-2.6/next.git] / fs / gfs2 / super.c
bloba2da76b5ae4cc5ac8e37b343b5ca10335484c343
1 /*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2006 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_ilimit = 100;
55 gt->gt_ilimit_tries = 3;
56 gt->gt_ilimit_min = 1;
57 gt->gt_demote_secs = 300;
58 gt->gt_incore_log_blocks = 1024;
59 gt->gt_log_flush_secs = 60;
60 gt->gt_jindex_refresh_secs = 60;
61 gt->gt_scand_secs = 15;
62 gt->gt_recoverd_secs = 60;
63 gt->gt_logd_secs = 1;
64 gt->gt_quotad_secs = 5;
65 gt->gt_quota_simul_sync = 64;
66 gt->gt_quota_warn_period = 10;
67 gt->gt_quota_scale_num = 1;
68 gt->gt_quota_scale_den = 1;
69 gt->gt_quota_cache_secs = 300;
70 gt->gt_quota_quantum = 60;
71 gt->gt_atime_quantum = 3600;
72 gt->gt_new_files_jdata = 0;
73 gt->gt_new_files_directio = 0;
74 gt->gt_max_readahead = 1 << 18;
75 gt->gt_lockdump_size = 131072;
76 gt->gt_stall_secs = 600;
77 gt->gt_complain_secs = 10;
78 gt->gt_reclaim_limit = 5000;
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_host *sb, int silent)
95 {
96 unsigned int x;
97
98 if (sb->sb_magic != GFS2_MAGIC ||
99 sb->sb_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 static void end_bio_io_page(struct bio *bio, int error)
164 {
165 struct page *page = bio->bi_private;
166
167 if (!error)
168 SetPageUptodate(page);
169 else
170 printk(KERN_WARNING "gfs2: error %d reading superblock\n", error);
171 unlock_page(page);
172 }
173
174 static void gfs2_sb_in(struct gfs2_sb_host *sb, const void *buf)
175 {
176 const struct gfs2_sb *str = buf;
177
178 sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic);
179 sb->sb_type = be32_to_cpu(str->sb_header.mh_type);
180 sb->sb_format = be32_to_cpu(str->sb_header.mh_format);
181 sb->sb_fs_format = be32_to_cpu(str->sb_fs_format);
182 sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format);
183 sb->sb_bsize = be32_to_cpu(str->sb_bsize);
184 sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift);
185 sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr);
186 sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino);
187 sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr);
188 sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino);
189
190 memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN);
191 memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN);
192 }
193
194 /**
195 * gfs2_read_super - Read the gfs2 super block from disk
196 * @sdp: The GFS2 super block
197 * @sector: The location of the super block
198 * @error: The error code to return
199 *
200 * This uses the bio functions to read the super block from disk
201 * because we want to be 100% sure that we never read cached data.
202 * A super block is read twice only during each GFS2 mount and is
203 * never written to by the filesystem. The first time its read no
204 * locks are held, and the only details which are looked at are those
205 * relating to the locking protocol. Once locking is up and working,
206 * the sb is read again under the lock to establish the location of
207 * the master directory (contains pointers to journals etc) and the
208 * root directory.
209 *
210 * Returns: 0 on success or error
211 */
212
213 int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector)
214 {
215 struct super_block *sb = sdp->sd_vfs;
216 struct gfs2_sb *p;
217 struct page *page;
218 struct bio *bio;
219
220 page = alloc_page(GFP_KERNEL);
221 if (unlikely(!page))
222 return -ENOBUFS;
223
224 ClearPageUptodate(page);
225 ClearPageDirty(page);
226 lock_page(page);
227
228 bio = bio_alloc(GFP_KERNEL, 1);
229 if (unlikely(!bio)) {
230 __free_page(page);
231 return -ENOBUFS;
232 }
233
234 bio->bi_sector = sector * (sb->s_blocksize >> 9);
235 bio->bi_bdev = sb->s_bdev;
236 bio_add_page(bio, page, PAGE_SIZE, 0);
237
238 bio->bi_end_io = end_bio_io_page;
239 bio->bi_private = page;
240 submit_bio(READ_SYNC | (1 << BIO_RW_META), bio);
241 wait_on_page_locked(page);
242 bio_put(bio);
243 if (!PageUptodate(page)) {
244 __free_page(page);
245 return -EIO;
246 }
247 p = kmap(page);
248 gfs2_sb_in(&sdp->sd_sb, p);
249 kunmap(page);
250 __free_page(page);
251 return 0;
252 }
253
254 /**
255 * gfs2_read_sb - Read super block
256 * @sdp: The GFS2 superblock
257 * @gl: the glock for the superblock (assumed to be held)
258 * @silent: Don't print message if mount fails
259 *
260 */
261
262 int gfs2_read_sb(struct gfs2_sbd *sdp, struct gfs2_glock *gl, int silent)
263 {
264 u32 hash_blocks, ind_blocks, leaf_blocks;
265 u32 tmp_blocks;
266 unsigned int x;
267 int error;
268
269 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift);
270 if (error) {
271 if (!silent)
272 fs_err(sdp, "can't read superblock\n");
273 return error;
274 }
275
276 error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
277 if (error)
278 return error;
279
280 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
281 GFS2_BASIC_BLOCK_SHIFT;
282 sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
283 sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
284 sizeof(struct gfs2_dinode)) / sizeof(u64);
285 sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
286 sizeof(struct gfs2_meta_header)) / sizeof(u64);
287 sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
288 sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
289 sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
290 sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64);
291 sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
292 sizeof(struct gfs2_meta_header)) /
293 sizeof(struct gfs2_quota_change);
294
295 /* Compute maximum reservation required to add a entry to a directory */
296
297 hash_blocks = DIV_ROUND_UP(sizeof(u64) * (1 << GFS2_DIR_MAX_DEPTH),
298 sdp->sd_jbsize);
299
300 ind_blocks = 0;
301 for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
302 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
303 ind_blocks += tmp_blocks;
304 }
305
306 leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
307
308 sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
309
310 sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
311 sizeof(struct gfs2_dinode);
312 sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
313 for (x = 2;; x++) {
314 u64 space, d;
315 u32 m;
316
317 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
318 d = space;
319 m = do_div(d, sdp->sd_inptrs);
320
321 if (d != sdp->sd_heightsize[x - 1] || m)
322 break;
323 sdp->sd_heightsize[x] = space;
324 }
325 sdp->sd_max_height = x;
326 gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
327
328 sdp->sd_jheightsize[0] = sdp->sd_sb.sb_bsize -
329 sizeof(struct gfs2_dinode);
330 sdp->sd_jheightsize[1] = sdp->sd_jbsize * sdp->sd_diptrs;
331 for (x = 2;; x++) {
332 u64 space, d;
333 u32 m;
334
335 space = sdp->sd_jheightsize[x - 1] * sdp->sd_inptrs;
336 d = space;
337 m = do_div(d, sdp->sd_inptrs);
338
339 if (d != sdp->sd_jheightsize[x - 1] || m)
340 break;
341 sdp->sd_jheightsize[x] = space;
342 }
343 sdp->sd_max_jheight = x;
344 gfs2_assert(sdp, sdp->sd_max_jheight <= GFS2_MAX_META_HEIGHT);
345
346 return 0;
347 }
348
349 /**
350 * gfs2_jindex_hold - Grab a lock on the jindex
351 * @sdp: The GFS2 superblock
352 * @ji_gh: the holder for the jindex glock
353 *
354 * This is very similar to the gfs2_rindex_hold() function, except that
355 * in general we hold the jindex lock for longer periods of time and
356 * we grab it far less frequently (in general) then the rgrp lock.
357 *
358 * Returns: errno
359 */
360
361 int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
362 {
363 struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex);
364 struct qstr name;
365 char buf[20];
366 struct gfs2_jdesc *jd;
367 int error;
368
369 name.name = buf;
370
371 mutex_lock(&sdp->sd_jindex_mutex);
372
373 for (;;) {
374 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh);
375 if (error)
376 break;
377
378 name.len = sprintf(buf, "journal%u", sdp->sd_journals);
379 name.hash = gfs2_disk_hash(name.name, name.len);
380
381 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL);
382 if (error == -ENOENT) {
383 error = 0;
384 break;
385 }
386
387 gfs2_glock_dq_uninit(ji_gh);
388
389 if (error)
390 break;
391
392 error = -ENOMEM;
393 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
394 if (!jd)
395 break;
396
397 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1, NULL);
398 if (!jd->jd_inode || IS_ERR(jd->jd_inode)) {
399 if (!jd->jd_inode)
400 error = -ENOENT;
401 else
402 error = PTR_ERR(jd->jd_inode);
403 kfree(jd);
404 break;
405 }
406
407 spin_lock(&sdp->sd_jindex_spin);
408 jd->jd_jid = sdp->sd_journals++;
409 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
410 spin_unlock(&sdp->sd_jindex_spin);
411 }
412
413 mutex_unlock(&sdp->sd_jindex_mutex);
414
415 return error;
416 }
417
418 /**
419 * gfs2_jindex_free - Clear all the journal index information
420 * @sdp: The GFS2 superblock
421 *
422 */
423
424 void gfs2_jindex_free(struct gfs2_sbd *sdp)
425 {
426 struct list_head list;
427 struct gfs2_jdesc *jd;
428
429 spin_lock(&sdp->sd_jindex_spin);
430 list_add(&list, &sdp->sd_jindex_list);
431 list_del_init(&sdp->sd_jindex_list);
432 sdp->sd_journals = 0;
433 spin_unlock(&sdp->sd_jindex_spin);
434
435 while (!list_empty(&list)) {
436 jd = list_entry(list.next, struct gfs2_jdesc, jd_list);
437 list_del(&jd->jd_list);
438 iput(jd->jd_inode);
439 kfree(jd);
440 }
441 }
442
443 static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid)
444 {
445 struct gfs2_jdesc *jd;
446 int found = 0;
447
448 list_for_each_entry(jd, head, jd_list) {
449 if (jd->jd_jid == jid) {
450 found = 1;
451 break;
452 }
453 }
454
455 if (!found)
456 jd = NULL;
457
458 return jd;
459 }
460
461 struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid)
462 {
463 struct gfs2_jdesc *jd;
464
465 spin_lock(&sdp->sd_jindex_spin);
466 jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
467 spin_unlock(&sdp->sd_jindex_spin);
468
469 return jd;
470 }
471
472 void gfs2_jdesc_make_dirty(struct gfs2_sbd *sdp, unsigned int jid)
473 {
474 struct gfs2_jdesc *jd;
475
476 spin_lock(&sdp->sd_jindex_spin);
477 jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
478 if (jd)
479 jd->jd_dirty = 1;
480 spin_unlock(&sdp->sd_jindex_spin);
481 }
482
483 struct gfs2_jdesc *gfs2_jdesc_find_dirty(struct gfs2_sbd *sdp)
484 {
485 struct gfs2_jdesc *jd;
486 int found = 0;
487
488 spin_lock(&sdp->sd_jindex_spin);
489
490 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
491 if (jd->jd_dirty) {
492 jd->jd_dirty = 0;
493 found = 1;
494 break;
495 }
496 }
497 spin_unlock(&sdp->sd_jindex_spin);
498
499 if (!found)
500 jd = NULL;
501
502 return jd;
503 }
504
505 int gfs2_jdesc_check(struct gfs2_jdesc *jd)
506 {
507 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
508 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
509 int ar;
510 int error;
511
512 if (ip->i_di.di_size < (8 << 20) || ip->i_di.di_size > (1 << 30) ||
513 (ip->i_di.di_size & (sdp->sd_sb.sb_bsize - 1))) {
514 gfs2_consist_inode(ip);
515 return -EIO;
516 }
517 jd->jd_blocks = ip->i_di.di_size >> sdp->sd_sb.sb_bsize_shift;
518
519 error = gfs2_write_alloc_required(ip, 0, ip->i_di.di_size, &ar);
520 if (!error && ar) {
521 gfs2_consist_inode(ip);
522 error = -EIO;
523 }
524
525 return error;
526 }
527
528 /**
529 * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
530 * @sdp: the filesystem
531 *
532 * Returns: errno
533 */
534
535 int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
536 {
537 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
538 struct gfs2_glock *j_gl = ip->i_gl;
539 struct gfs2_holder t_gh;
540 struct gfs2_log_header_host head;
541 int error;
542
543 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &t_gh);
544 if (error)
545 return error;
546
547 gfs2_meta_cache_flush(ip);
548 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
549
550 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
551 if (error)
552 goto fail;
553
554 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
555 gfs2_consist(sdp);
556 error = -EIO;
557 goto fail;
558 }
559
560 /* Initialize some head of the log stuff */
561 sdp->sd_log_sequence = head.lh_sequence + 1;
562 gfs2_log_pointers_init(sdp, head.lh_blkno);
563
564 error = gfs2_quota_init(sdp);
565 if (error)
566 goto fail;
567
568 set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
569
570 gfs2_glock_dq_uninit(&t_gh);
571
572 return 0;
573
574 fail:
575 t_gh.gh_flags |= GL_NOCACHE;
576 gfs2_glock_dq_uninit(&t_gh);
577
578 return error;
579 }
580
581 /**
582 * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
583 * @sdp: the filesystem
584 *
585 * Returns: errno
586 */
587
588 int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
589 {
590 struct gfs2_holder t_gh;
591 int error;
592
593 gfs2_quota_sync(sdp);
594 gfs2_statfs_sync(sdp);
595
596 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, GL_NOCACHE,
597 &t_gh);
598 if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
599 return error;
600
601 gfs2_meta_syncfs(sdp);
602 gfs2_log_shutdown(sdp);
603
604 clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
605
606 if (t_gh.gh_gl)
607 gfs2_glock_dq_uninit(&t_gh);
608
609 gfs2_quota_cleanup(sdp);
610
611 return error;
612 }
613
614 static void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf)
615 {
616 const struct gfs2_statfs_change *str = buf;
617
618 sc->sc_total = be64_to_cpu(str->sc_total);
619 sc->sc_free = be64_to_cpu(str->sc_free);
620 sc->sc_dinodes = be64_to_cpu(str->sc_dinodes);
621 }
622
623 static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf)
624 {
625 struct gfs2_statfs_change *str = buf;
626
627 str->sc_total = cpu_to_be64(sc->sc_total);
628 str->sc_free = cpu_to_be64(sc->sc_free);
629 str->sc_dinodes = cpu_to_be64(sc->sc_dinodes);
630 }
631
632 int gfs2_statfs_init(struct gfs2_sbd *sdp)
633 {
634 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
635 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
636 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
637 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
638 struct buffer_head *m_bh, *l_bh;
639 struct gfs2_holder gh;
640 int error;
641
642 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
643 &gh);
644 if (error)
645 return error;
646
647 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
648 if (error)
649 goto out;
650
651 if (sdp->sd_args.ar_spectator) {
652 spin_lock(&sdp->sd_statfs_spin);
653 gfs2_statfs_change_in(m_sc, m_bh->b_data +
654 sizeof(struct gfs2_dinode));
655 spin_unlock(&sdp->sd_statfs_spin);
656 } else {
657 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
658 if (error)
659 goto out_m_bh;
660
661 spin_lock(&sdp->sd_statfs_spin);
662 gfs2_statfs_change_in(m_sc, m_bh->b_data +
663 sizeof(struct gfs2_dinode));
664 gfs2_statfs_change_in(l_sc, l_bh->b_data +
665 sizeof(struct gfs2_dinode));
666 spin_unlock(&sdp->sd_statfs_spin);
667
668 brelse(l_bh);
669 }
670
671 out_m_bh:
672 brelse(m_bh);
673 out:
674 gfs2_glock_dq_uninit(&gh);
675 return 0;
676 }
677
678 void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free,
679 s64 dinodes)
680 {
681 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
682 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
683 struct buffer_head *l_bh;
684 int error;
685
686 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
687 if (error)
688 return;
689
690 mutex_lock(&sdp->sd_statfs_mutex);
691 gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
692 mutex_unlock(&sdp->sd_statfs_mutex);
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 mutex_lock(&sdp->sd_statfs_mutex);
741 gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
742 mutex_unlock(&sdp->sd_statfs_mutex);
743
744 spin_lock(&sdp->sd_statfs_spin);
745 m_sc->sc_total += l_sc->sc_total;
746 m_sc->sc_free += l_sc->sc_free;
747 m_sc->sc_dinodes += l_sc->sc_dinodes;
748 memset(l_sc, 0, sizeof(struct gfs2_statfs_change));
749 memset(l_bh->b_data + sizeof(struct gfs2_dinode),
750 0, sizeof(struct gfs2_statfs_change));
751 spin_unlock(&sdp->sd_statfs_spin);
752
753 gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
754 gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
755
756 gfs2_trans_end(sdp);
757
758 out_bh2:
759 brelse(l_bh);
760 out_bh:
761 brelse(m_bh);
762 out:
763 gfs2_glock_dq_uninit(&gh);
764 return error;
765 }
766
767 /**
768 * gfs2_statfs_i - Do a statfs
769 * @sdp: the filesystem
770 * @sg: the sg structure
771 *
772 * Returns: errno
773 */
774
775 int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
776 {
777 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
778 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
779
780 spin_lock(&sdp->sd_statfs_spin);
781
782 *sc = *m_sc;
783 sc->sc_total += l_sc->sc_total;
784 sc->sc_free += l_sc->sc_free;
785 sc->sc_dinodes += l_sc->sc_dinodes;
786
787 spin_unlock(&sdp->sd_statfs_spin);
788
789 if (sc->sc_free < 0)
790 sc->sc_free = 0;
791 if (sc->sc_free > sc->sc_total)
792 sc->sc_free = sc->sc_total;
793 if (sc->sc_dinodes < 0)
794 sc->sc_dinodes = 0;
795
796 return 0;
797 }
798
799 /**
800 * statfs_fill - fill in the sg for a given RG
801 * @rgd: the RG
802 * @sc: the sc structure
803 *
804 * Returns: 0 on success, -ESTALE if the LVB is invalid
805 */
806
807 static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
808 struct gfs2_statfs_change_host *sc)
809 {
810 gfs2_rgrp_verify(rgd);
811 sc->sc_total += rgd->rd_data;
812 sc->sc_free += rgd->rd_rg.rg_free;
813 sc->sc_dinodes += rgd->rd_rg.rg_dinodes;
814 return 0;
815 }
816
817 /**
818 * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
819 * @sdp: the filesystem
820 * @sc: the sc info that will be returned
821 *
822 * Any error (other than a signal) will cause this routine to fall back
823 * to the synchronous version.
824 *
825 * FIXME: This really shouldn't busy wait like this.
826 *
827 * Returns: errno
828 */
829
830 int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
831 {
832 struct gfs2_holder ri_gh;
833 struct gfs2_rgrpd *rgd_next;
834 struct gfs2_holder *gha, *gh;
835 unsigned int slots = 64;
836 unsigned int x;
837 int done;
838 int error = 0, err;
839
840 memset(sc, 0, sizeof(struct gfs2_statfs_change_host));
841 gha = kcalloc(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
842 if (!gha)
843 return -ENOMEM;
844
845 error = gfs2_rindex_hold(sdp, &ri_gh);
846 if (error)
847 goto out;
848
849 rgd_next = gfs2_rgrpd_get_first(sdp);
850
851 for (;;) {
852 done = 1;
853
854 for (x = 0; x < slots; x++) {
855 gh = gha + x;
856
857 if (gh->gh_gl && gfs2_glock_poll(gh)) {
858 err = gfs2_glock_wait(gh);
859 if (err) {
860 gfs2_holder_uninit(gh);
861 error = err;
862 } else {
863 if (!error)
864 error = statfs_slow_fill(
865 gh->gh_gl->gl_object, sc);
866 gfs2_glock_dq_uninit(gh);
867 }
868 }
869
870 if (gh->gh_gl)
871 done = 0;
872 else if (rgd_next && !error) {
873 error = gfs2_glock_nq_init(rgd_next->rd_gl,
874 LM_ST_SHARED,
875 GL_ASYNC,
876 gh);
877 rgd_next = gfs2_rgrpd_get_next(rgd_next);
878 done = 0;
879 }
880
881 if (signal_pending(current))
882 error = -ERESTARTSYS;
883 }
884
885 if (done)
886 break;
887
888 yield();
889 }
890
891 gfs2_glock_dq_uninit(&ri_gh);
892
893 out:
894 kfree(gha);
895 return error;
896 }
897
898 struct lfcc {
899 struct list_head list;
900 struct gfs2_holder gh;
901 };
902
903 /**
904 * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
905 * journals are clean
906 * @sdp: the file system
907 * @state: the state to put the transaction lock into
908 * @t_gh: the hold on the transaction lock
909 *
910 * Returns: errno
911 */
912
913 static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp,
914 struct gfs2_holder *t_gh)
915 {
916 struct gfs2_inode *ip;
917 struct gfs2_holder ji_gh;
918 struct gfs2_jdesc *jd;
919 struct lfcc *lfcc;
920 LIST_HEAD(list);
921 struct gfs2_log_header_host lh;
922 int error;
923
924 error = gfs2_jindex_hold(sdp, &ji_gh);
925 if (error)
926 return error;
927
928 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
929 lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
930 if (!lfcc) {
931 error = -ENOMEM;
932 goto out;
933 }
934 ip = GFS2_I(jd->jd_inode);
935 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh);
936 if (error) {
937 kfree(lfcc);
938 goto out;
939 }
940 list_add(&lfcc->list, &list);
941 }
942
943 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_DEFERRED,
944 LM_FLAG_PRIORITY | GL_NOCACHE,
945 t_gh);
946
947 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
948 error = gfs2_jdesc_check(jd);
949 if (error)
950 break;
951 error = gfs2_find_jhead(jd, &lh);
952 if (error)
953 break;
954 if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
955 error = -EBUSY;
956 break;
957 }
958 }
959
960 if (error)
961 gfs2_glock_dq_uninit(t_gh);
962
963 out:
964 while (!list_empty(&list)) {
965 lfcc = list_entry(list.next, struct lfcc, list);
966 list_del(&lfcc->list);
967 gfs2_glock_dq_uninit(&lfcc->gh);
968 kfree(lfcc);
969 }
970 gfs2_glock_dq_uninit(&ji_gh);
971 return error;
972 }
973
974 /**
975 * gfs2_freeze_fs - freezes the file system
976 * @sdp: the file system
977 *
978 * This function flushes data and meta data for all machines by
979 * aquiring the transaction log exclusively. All journals are
980 * ensured to be in a clean state as well.
981 *
982 * Returns: errno
983 */
984
985 int gfs2_freeze_fs(struct gfs2_sbd *sdp)
986 {
987 int error = 0;
988
989 mutex_lock(&sdp->sd_freeze_lock);
990
991 if (!sdp->sd_freeze_count++) {
992 error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh);
993 if (error)
994 sdp->sd_freeze_count--;
995 }
996
997 mutex_unlock(&sdp->sd_freeze_lock);
998
999 return error;
1000 }
1001
1002 /**
1003 * gfs2_unfreeze_fs - unfreezes the file system
1004 * @sdp: the file system
1005 *
1006 * This function allows the file system to proceed by unlocking
1007 * the exclusively held transaction lock. Other GFS2 nodes are
1008 * now free to acquire the lock shared and go on with their lives.
1009 *
1010 */
1011
1012 void gfs2_unfreeze_fs(struct gfs2_sbd *sdp)
1013 {
1014 mutex_lock(&sdp->sd_freeze_lock);
1015
1016 if (sdp->sd_freeze_count && !--sdp->sd_freeze_count)
1017 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
1018
1019 mutex_unlock(&sdp->sd_freeze_lock);
1020 }
1021
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