?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
[TCP]: Move prior_in_flight collect to more robust place
[linux-2.6/sactl.git] / fs / gfs2 / super.c
blobdd3e737f528e0b111387b506608e63fc99ef5c0b
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_recoverd_secs = 60;
62 gt->gt_logd_secs = 1;
63 gt->gt_quotad_secs = 5;
64 gt->gt_quota_simul_sync = 64;
65 gt->gt_quota_warn_period = 10;
66 gt->gt_quota_scale_num = 1;
67 gt->gt_quota_scale_den = 1;
68 gt->gt_quota_cache_secs = 300;
69 gt->gt_quota_quantum = 60;
70 gt->gt_atime_quantum = 3600;
71 gt->gt_new_files_jdata = 0;
72 gt->gt_new_files_directio = 0;
73 gt->gt_max_readahead = 1 << 18;
74 gt->gt_lockdump_size = 131072;
75 gt->gt_stall_secs = 600;
76 gt->gt_complain_secs = 10;
77 gt->gt_reclaim_limit = 5000;
78 gt->gt_statfs_quantum = 30;
79 gt->gt_statfs_slow = 0;
80 }
81
82 /**
83 * gfs2_check_sb - Check superblock
84 * @sdp: the filesystem
85 * @sb: The superblock
86 * @silent: Don't print a message if the check fails
87 *
88 * Checks the version code of the FS is one that we understand how to
89 * read and that the sizes of the various on-disk structures have not
90 * changed.
91 */
92
93 int gfs2_check_sb(struct gfs2_sbd *sdp, struct gfs2_sb_host *sb, int silent)
94 {
95 unsigned int x;
96
97 if (sb->sb_magic != GFS2_MAGIC ||
98 sb->sb_type != GFS2_METATYPE_SB) {
99 if (!silent)
100 printk(KERN_WARNING "GFS2: not a GFS2 filesystem\n");
101 return -EINVAL;
102 }
103
104 /* If format numbers match exactly, we're done. */
105
106 if (sb->sb_fs_format == GFS2_FORMAT_FS &&
107 sb->sb_multihost_format == GFS2_FORMAT_MULTI)
108 return 0;
109
110 if (sb->sb_fs_format != GFS2_FORMAT_FS) {
111 for (x = 0; gfs2_old_fs_formats[x]; x++)
112 if (gfs2_old_fs_formats[x] == sb->sb_fs_format)
113 break;
114
115 if (!gfs2_old_fs_formats[x]) {
116 printk(KERN_WARNING
117 "GFS2: code version (%u, %u) is incompatible "
118 "with ondisk format (%u, %u)\n",
119 GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
120 sb->sb_fs_format, sb->sb_multihost_format);
121 printk(KERN_WARNING
122 "GFS2: I don't know how to upgrade this FS\n");
123 return -EINVAL;
124 }
125 }
126
127 if (sb->sb_multihost_format != GFS2_FORMAT_MULTI) {
128 for (x = 0; gfs2_old_multihost_formats[x]; x++)
129 if (gfs2_old_multihost_formats[x] ==
130 sb->sb_multihost_format)
131 break;
132
133 if (!gfs2_old_multihost_formats[x]) {
134 printk(KERN_WARNING
135 "GFS2: code version (%u, %u) is incompatible "
136 "with ondisk format (%u, %u)\n",
137 GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
138 sb->sb_fs_format, sb->sb_multihost_format);
139 printk(KERN_WARNING
140 "GFS2: I don't know how to upgrade this FS\n");
141 return -EINVAL;
142 }
143 }
144
145 if (!sdp->sd_args.ar_upgrade) {
146 printk(KERN_WARNING
147 "GFS2: code version (%u, %u) is incompatible "
148 "with ondisk format (%u, %u)\n",
149 GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
150 sb->sb_fs_format, sb->sb_multihost_format);
151 printk(KERN_INFO
152 "GFS2: Use the \"upgrade\" mount option to upgrade "
153 "the FS\n");
154 printk(KERN_INFO "GFS2: See the manual for more details\n");
155 return -EINVAL;
156 }
157
158 return 0;
159 }
160
161
162 static void end_bio_io_page(struct bio *bio, int error)
163 {
164 struct page *page = bio->bi_private;
165
166 if (!error)
167 SetPageUptodate(page);
168 else
169 printk(KERN_WARNING "gfs2: error %d reading superblock\n", error);
170 unlock_page(page);
171 }
172
173 static void gfs2_sb_in(struct gfs2_sb_host *sb, const void *buf)
174 {
175 const struct gfs2_sb *str = buf;
176
177 sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic);
178 sb->sb_type = be32_to_cpu(str->sb_header.mh_type);
179 sb->sb_format = be32_to_cpu(str->sb_header.mh_format);
180 sb->sb_fs_format = be32_to_cpu(str->sb_fs_format);
181 sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format);
182 sb->sb_bsize = be32_to_cpu(str->sb_bsize);
183 sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift);
184 sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr);
185 sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino);
186 sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr);
187 sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino);
188
189 memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN);
190 memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN);
191 }
192
193 /**
194 * gfs2_read_super - Read the gfs2 super block from disk
195 * @sdp: The GFS2 super block
196 * @sector: The location of the super block
197 * @error: The error code to return
198 *
199 * This uses the bio functions to read the super block from disk
200 * because we want to be 100% sure that we never read cached data.
201 * A super block is read twice only during each GFS2 mount and is
202 * never written to by the filesystem. The first time its read no
203 * locks are held, and the only details which are looked at are those
204 * relating to the locking protocol. Once locking is up and working,
205 * the sb is read again under the lock to establish the location of
206 * the master directory (contains pointers to journals etc) and the
207 * root directory.
208 *
209 * Returns: 0 on success or error
210 */
211
212 int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector)
213 {
214 struct super_block *sb = sdp->sd_vfs;
215 struct gfs2_sb *p;
216 struct page *page;
217 struct bio *bio;
218
219 page = alloc_page(GFP_KERNEL);
220 if (unlikely(!page))
221 return -ENOBUFS;
222
223 ClearPageUptodate(page);
224 ClearPageDirty(page);
225 lock_page(page);
226
227 bio = bio_alloc(GFP_KERNEL, 1);
228 if (unlikely(!bio)) {
229 __free_page(page);
230 return -ENOBUFS;
231 }
232
233 bio->bi_sector = sector * (sb->s_blocksize >> 9);
234 bio->bi_bdev = sb->s_bdev;
235 bio_add_page(bio, page, PAGE_SIZE, 0);
236
237 bio->bi_end_io = end_bio_io_page;
238 bio->bi_private = page;
239 submit_bio(READ_SYNC | (1 << BIO_RW_META), bio);
240 wait_on_page_locked(page);
241 bio_put(bio);
242 if (!PageUptodate(page)) {
243 __free_page(page);
244 return -EIO;
245 }
246 p = kmap(page);
247 gfs2_sb_in(&sdp->sd_sb, p);
248 kunmap(page);
249 __free_page(page);
250 return 0;
251 }
252
253 /**
254 * gfs2_read_sb - Read super block
255 * @sdp: The GFS2 superblock
256 * @gl: the glock for the superblock (assumed to be held)
257 * @silent: Don't print message if mount fails
258 *
259 */
260
261 int gfs2_read_sb(struct gfs2_sbd *sdp, struct gfs2_glock *gl, int silent)
262 {
263 u32 hash_blocks, ind_blocks, leaf_blocks;
264 u32 tmp_blocks;
265 unsigned int x;
266 int error;
267
268 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift);
269 if (error) {
270 if (!silent)
271 fs_err(sdp, "can't read superblock\n");
272 return error;
273 }
274
275 error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
276 if (error)
277 return error;
278
279 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
280 GFS2_BASIC_BLOCK_SHIFT;
281 sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
282 sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
283 sizeof(struct gfs2_dinode)) / sizeof(u64);
284 sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
285 sizeof(struct gfs2_meta_header)) / sizeof(u64);
286 sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
287 sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
288 sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
289 sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64);
290 sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
291 sizeof(struct gfs2_meta_header)) /
292 sizeof(struct gfs2_quota_change);
293
294 /* Compute maximum reservation required to add a entry to a directory */
295
296 hash_blocks = DIV_ROUND_UP(sizeof(u64) * (1 << GFS2_DIR_MAX_DEPTH),
297 sdp->sd_jbsize);
298
299 ind_blocks = 0;
300 for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
301 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
302 ind_blocks += tmp_blocks;
303 }
304
305 leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
306
307 sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
308
309 sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
310 sizeof(struct gfs2_dinode);
311 sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
312 for (x = 2;; x++) {
313 u64 space, d;
314 u32 m;
315
316 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
317 d = space;
318 m = do_div(d, sdp->sd_inptrs);
319
320 if (d != sdp->sd_heightsize[x - 1] || m)
321 break;
322 sdp->sd_heightsize[x] = space;
323 }
324 sdp->sd_max_height = x;
325 gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
326
327 sdp->sd_jheightsize[0] = sdp->sd_sb.sb_bsize -
328 sizeof(struct gfs2_dinode);
329 sdp->sd_jheightsize[1] = sdp->sd_jbsize * sdp->sd_diptrs;
330 for (x = 2;; x++) {
331 u64 space, d;
332 u32 m;
333
334 space = sdp->sd_jheightsize[x - 1] * sdp->sd_inptrs;
335 d = space;
336 m = do_div(d, sdp->sd_inptrs);
337
338 if (d != sdp->sd_jheightsize[x - 1] || m)
339 break;
340 sdp->sd_jheightsize[x] = space;
341 }
342 sdp->sd_max_jheight = x;
343 gfs2_assert(sdp, sdp->sd_max_jheight <= GFS2_MAX_META_HEIGHT);
344
345 return 0;
346 }
347
348 /**
349 * gfs2_jindex_hold - Grab a lock on the jindex
350 * @sdp: The GFS2 superblock
351 * @ji_gh: the holder for the jindex glock
352 *
353 * This is very similar to the gfs2_rindex_hold() function, except that
354 * in general we hold the jindex lock for longer periods of time and
355 * we grab it far less frequently (in general) then the rgrp lock.
356 *
357 * Returns: errno
358 */
359
360 int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
361 {
362 struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex);
363 struct qstr name;
364 char buf[20];
365 struct gfs2_jdesc *jd;
366 int error;
367
368 name.name = buf;
369
370 mutex_lock(&sdp->sd_jindex_mutex);
371
372 for (;;) {
373 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh);
374 if (error)
375 break;
376
377 name.len = sprintf(buf, "journal%u", sdp->sd_journals);
378 name.hash = gfs2_disk_hash(name.name, name.len);
379
380 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL);
381 if (error == -ENOENT) {
382 error = 0;
383 break;
384 }
385
386 gfs2_glock_dq_uninit(ji_gh);
387
388 if (error)
389 break;
390
391 error = -ENOMEM;
392 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
393 if (!jd)
394 break;
395
396 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1, NULL);
397 if (!jd->jd_inode || IS_ERR(jd->jd_inode)) {
398 if (!jd->jd_inode)
399 error = -ENOENT;
400 else
401 error = PTR_ERR(jd->jd_inode);
402 kfree(jd);
403 break;
404 }
405
406 spin_lock(&sdp->sd_jindex_spin);
407 jd->jd_jid = sdp->sd_journals++;
408 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
409 spin_unlock(&sdp->sd_jindex_spin);
410 }
411
412 mutex_unlock(&sdp->sd_jindex_mutex);
413
414 return error;
415 }
416
417 /**
418 * gfs2_jindex_free - Clear all the journal index information
419 * @sdp: The GFS2 superblock
420 *
421 */
422
423 void gfs2_jindex_free(struct gfs2_sbd *sdp)
424 {
425 struct list_head list;
426 struct gfs2_jdesc *jd;
427
428 spin_lock(&sdp->sd_jindex_spin);
429 list_add(&list, &sdp->sd_jindex_list);
430 list_del_init(&sdp->sd_jindex_list);
431 sdp->sd_journals = 0;
432 spin_unlock(&sdp->sd_jindex_spin);
433
434 while (!list_empty(&list)) {
435 jd = list_entry(list.next, struct gfs2_jdesc, jd_list);
436 list_del(&jd->jd_list);
437 iput(jd->jd_inode);
438 kfree(jd);
439 }
440 }
441
442 static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid)
443 {
444 struct gfs2_jdesc *jd;
445 int found = 0;
446
447 list_for_each_entry(jd, head, jd_list) {
448 if (jd->jd_jid == jid) {
449 found = 1;
450 break;
451 }
452 }
453
454 if (!found)
455 jd = NULL;
456
457 return jd;
458 }
459
460 struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid)
461 {
462 struct gfs2_jdesc *jd;
463
464 spin_lock(&sdp->sd_jindex_spin);
465 jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
466 spin_unlock(&sdp->sd_jindex_spin);
467
468 return jd;
469 }
470
471 void gfs2_jdesc_make_dirty(struct gfs2_sbd *sdp, unsigned int jid)
472 {
473 struct gfs2_jdesc *jd;
474
475 spin_lock(&sdp->sd_jindex_spin);
476 jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
477 if (jd)
478 jd->jd_dirty = 1;
479 spin_unlock(&sdp->sd_jindex_spin);
480 }
481
482 struct gfs2_jdesc *gfs2_jdesc_find_dirty(struct gfs2_sbd *sdp)
483 {
484 struct gfs2_jdesc *jd;
485 int found = 0;
486
487 spin_lock(&sdp->sd_jindex_spin);
488
489 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
490 if (jd->jd_dirty) {
491 jd->jd_dirty = 0;
492 found = 1;
493 break;
494 }
495 }
496 spin_unlock(&sdp->sd_jindex_spin);
497
498 if (!found)
499 jd = NULL;
500
501 return jd;
502 }
503
504 int gfs2_jdesc_check(struct gfs2_jdesc *jd)
505 {
506 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
507 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
508 int ar;
509 int error;
510
511 if (ip->i_di.di_size < (8 << 20) || ip->i_di.di_size > (1 << 30) ||
512 (ip->i_di.di_size & (sdp->sd_sb.sb_bsize - 1))) {
513 gfs2_consist_inode(ip);
514 return -EIO;
515 }
516 jd->jd_blocks = ip->i_di.di_size >> sdp->sd_sb.sb_bsize_shift;
517
518 error = gfs2_write_alloc_required(ip, 0, ip->i_di.di_size, &ar);
519 if (!error && ar) {
520 gfs2_consist_inode(ip);
521 error = -EIO;
522 }
523
524 return error;
525 }
526
527 /**
528 * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
529 * @sdp: the filesystem
530 *
531 * Returns: errno
532 */
533
534 int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
535 {
536 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
537 struct gfs2_glock *j_gl = ip->i_gl;
538 struct gfs2_holder t_gh;
539 struct gfs2_log_header_host head;
540 int error;
541
542 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &t_gh);
543 if (error)
544 return error;
545
546 gfs2_meta_cache_flush(ip);
547 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
548
549 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
550 if (error)
551 goto fail;
552
553 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
554 gfs2_consist(sdp);
555 error = -EIO;
556 goto fail;
557 }
558
559 /* Initialize some head of the log stuff */
560 sdp->sd_log_sequence = head.lh_sequence + 1;
561 gfs2_log_pointers_init(sdp, head.lh_blkno);
562
563 error = gfs2_quota_init(sdp);
564 if (error)
565 goto fail;
566
567 set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
568
569 gfs2_glock_dq_uninit(&t_gh);
570
571 return 0;
572
573 fail:
574 t_gh.gh_flags |= GL_NOCACHE;
575 gfs2_glock_dq_uninit(&t_gh);
576
577 return error;
578 }
579
580 /**
581 * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
582 * @sdp: the filesystem
583 *
584 * Returns: errno
585 */
586
587 int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
588 {
589 struct gfs2_holder t_gh;
590 int error;
591
592 gfs2_quota_sync(sdp);
593 gfs2_statfs_sync(sdp);
594
595 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, GL_NOCACHE,
596 &t_gh);
597 if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
598 return error;
599
600 gfs2_meta_syncfs(sdp);
601 gfs2_log_shutdown(sdp);
602
603 clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
604
605 if (t_gh.gh_gl)
606 gfs2_glock_dq_uninit(&t_gh);
607
608 gfs2_quota_cleanup(sdp);
609
610 return error;
611 }
612
613 static void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf)
614 {
615 const struct gfs2_statfs_change *str = buf;
616
617 sc->sc_total = be64_to_cpu(str->sc_total);
618 sc->sc_free = be64_to_cpu(str->sc_free);
619 sc->sc_dinodes = be64_to_cpu(str->sc_dinodes);
620 }
621
622 static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf)
623 {
624 struct gfs2_statfs_change *str = buf;
625
626 str->sc_total = cpu_to_be64(sc->sc_total);
627 str->sc_free = cpu_to_be64(sc->sc_free);
628 str->sc_dinodes = cpu_to_be64(sc->sc_dinodes);
629 }
630
631 int gfs2_statfs_init(struct gfs2_sbd *sdp)
632 {
633 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
634 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
635 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
636 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
637 struct buffer_head *m_bh, *l_bh;
638 struct gfs2_holder gh;
639 int error;
640
641 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
642 &gh);
643 if (error)
644 return error;
645
646 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
647 if (error)
648 goto out;
649
650 if (sdp->sd_args.ar_spectator) {
651 spin_lock(&sdp->sd_statfs_spin);
652 gfs2_statfs_change_in(m_sc, m_bh->b_data +
653 sizeof(struct gfs2_dinode));
654 spin_unlock(&sdp->sd_statfs_spin);
655 } else {
656 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
657 if (error)
658 goto out_m_bh;
659
660 spin_lock(&sdp->sd_statfs_spin);
661 gfs2_statfs_change_in(m_sc, m_bh->b_data +
662 sizeof(struct gfs2_dinode));
663 gfs2_statfs_change_in(l_sc, l_bh->b_data +
664 sizeof(struct gfs2_dinode));
665 spin_unlock(&sdp->sd_statfs_spin);
666
667 brelse(l_bh);
668 }
669
670 out_m_bh:
671 brelse(m_bh);
672 out:
673 gfs2_glock_dq_uninit(&gh);
674 return 0;
675 }
676
677 void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free,
678 s64 dinodes)
679 {
680 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
681 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
682 struct buffer_head *l_bh;
683 int error;
684
685 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
686 if (error)
687 return;
688
689 mutex_lock(&sdp->sd_statfs_mutex);
690 gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
691 mutex_unlock(&sdp->sd_statfs_mutex);
692
693 spin_lock(&sdp->sd_statfs_spin);
694 l_sc->sc_total += total;
695 l_sc->sc_free += free;
696 l_sc->sc_dinodes += dinodes;
697 gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode));
698 spin_unlock(&sdp->sd_statfs_spin);
699
700 brelse(l_bh);
701 }
702
703 int gfs2_statfs_sync(struct gfs2_sbd *sdp)
704 {
705 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
706 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
707 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
708 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
709 struct gfs2_holder gh;
710 struct buffer_head *m_bh, *l_bh;
711 int error;
712
713 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
714 &gh);
715 if (error)
716 return error;
717
718 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
719 if (error)
720 goto out;
721
722 spin_lock(&sdp->sd_statfs_spin);
723 gfs2_statfs_change_in(m_sc, m_bh->b_data +
724 sizeof(struct gfs2_dinode));
725 if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) {
726 spin_unlock(&sdp->sd_statfs_spin);
727 goto out_bh;
728 }
729 spin_unlock(&sdp->sd_statfs_spin);
730
731 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
732 if (error)
733 goto out_bh;
734
735 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
736 if (error)
737 goto out_bh2;
738
739 mutex_lock(&sdp->sd_statfs_mutex);
740 gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
741 mutex_unlock(&sdp->sd_statfs_mutex);
742
743 spin_lock(&sdp->sd_statfs_spin);
744 m_sc->sc_total += l_sc->sc_total;
745 m_sc->sc_free += l_sc->sc_free;
746 m_sc->sc_dinodes += l_sc->sc_dinodes;
747 memset(l_sc, 0, sizeof(struct gfs2_statfs_change));
748 memset(l_bh->b_data + sizeof(struct gfs2_dinode),
749 0, sizeof(struct gfs2_statfs_change));
750 spin_unlock(&sdp->sd_statfs_spin);
751
752 gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
753 gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
754
755 gfs2_trans_end(sdp);
756
757 out_bh2:
758 brelse(l_bh);
759 out_bh:
760 brelse(m_bh);
761 out:
762 gfs2_glock_dq_uninit(&gh);
763 return error;
764 }
765
766 /**
767 * gfs2_statfs_i - Do a statfs
768 * @sdp: the filesystem
769 * @sg: the sg structure
770 *
771 * Returns: errno
772 */
773
774 int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
775 {
776 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
777 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
778
779 spin_lock(&sdp->sd_statfs_spin);
780
781 *sc = *m_sc;
782 sc->sc_total += l_sc->sc_total;
783 sc->sc_free += l_sc->sc_free;
784 sc->sc_dinodes += l_sc->sc_dinodes;
785
786 spin_unlock(&sdp->sd_statfs_spin);
787
788 if (sc->sc_free < 0)
789 sc->sc_free = 0;
790 if (sc->sc_free > sc->sc_total)
791 sc->sc_free = sc->sc_total;
792 if (sc->sc_dinodes < 0)
793 sc->sc_dinodes = 0;
794
795 return 0;
796 }
797
798 /**
799 * statfs_fill - fill in the sg for a given RG
800 * @rgd: the RG
801 * @sc: the sc structure
802 *
803 * Returns: 0 on success, -ESTALE if the LVB is invalid
804 */
805
806 static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
807 struct gfs2_statfs_change_host *sc)
808 {
809 gfs2_rgrp_verify(rgd);
810 sc->sc_total += rgd->rd_data;
811 sc->sc_free += rgd->rd_rg.rg_free;
812 sc->sc_dinodes += rgd->rd_rg.rg_dinodes;
813 return 0;
814 }
815
816 /**
817 * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
818 * @sdp: the filesystem
819 * @sc: the sc info that will be returned
820 *
821 * Any error (other than a signal) will cause this routine to fall back
822 * to the synchronous version.
823 *
824 * FIXME: This really shouldn't busy wait like this.
825 *
826 * Returns: errno
827 */
828
829 int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
830 {
831 struct gfs2_holder ri_gh;
832 struct gfs2_rgrpd *rgd_next;
833 struct gfs2_holder *gha, *gh;
834 unsigned int slots = 64;
835 unsigned int x;
836 int done;
837 int error = 0, err;
838
839 memset(sc, 0, sizeof(struct gfs2_statfs_change_host));
840 gha = kcalloc(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
841 if (!gha)
842 return -ENOMEM;
843
844 error = gfs2_rindex_hold(sdp, &ri_gh);
845 if (error)
846 goto out;
847
848 rgd_next = gfs2_rgrpd_get_first(sdp);
849
850 for (;;) {
851 done = 1;
852
853 for (x = 0; x < slots; x++) {
854 gh = gha + x;
855
856 if (gh->gh_gl && gfs2_glock_poll(gh)) {
857 err = gfs2_glock_wait(gh);
858 if (err) {
859 gfs2_holder_uninit(gh);
860 error = err;
861 } else {
862 if (!error)
863 error = statfs_slow_fill(
864 gh->gh_gl->gl_object, sc);
865 gfs2_glock_dq_uninit(gh);
866 }
867 }
868
869 if (gh->gh_gl)
870 done = 0;
871 else if (rgd_next && !error) {
872 error = gfs2_glock_nq_init(rgd_next->rd_gl,
873 LM_ST_SHARED,
874 GL_ASYNC,
875 gh);
876 rgd_next = gfs2_rgrpd_get_next(rgd_next);
877 done = 0;
878 }
879
880 if (signal_pending(current))
881 error = -ERESTARTSYS;
882 }
883
884 if (done)
885 break;
886
887 yield();
888 }
889
890 gfs2_glock_dq_uninit(&ri_gh);
891
892 out:
893 kfree(gha);
894 return error;
895 }
896
897 struct lfcc {
898 struct list_head list;
899 struct gfs2_holder gh;
900 };
901
902 /**
903 * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
904 * journals are clean
905 * @sdp: the file system
906 * @state: the state to put the transaction lock into
907 * @t_gh: the hold on the transaction lock
908 *
909 * Returns: errno
910 */
911
912 static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp,
913 struct gfs2_holder *t_gh)
914 {
915 struct gfs2_inode *ip;
916 struct gfs2_holder ji_gh;
917 struct gfs2_jdesc *jd;
918 struct lfcc *lfcc;
919 LIST_HEAD(list);
920 struct gfs2_log_header_host lh;
921 int error;
922
923 error = gfs2_jindex_hold(sdp, &ji_gh);
924 if (error)
925 return error;
926
927 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
928 lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
929 if (!lfcc) {
930 error = -ENOMEM;
931 goto out;
932 }
933 ip = GFS2_I(jd->jd_inode);
934 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh);
935 if (error) {
936 kfree(lfcc);
937 goto out;
938 }
939 list_add(&lfcc->list, &list);
940 }
941
942 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_DEFERRED,
943 LM_FLAG_PRIORITY | GL_NOCACHE,
944 t_gh);
945
946 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
947 error = gfs2_jdesc_check(jd);
948 if (error)
949 break;
950 error = gfs2_find_jhead(jd, &lh);
951 if (error)
952 break;
953 if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
954 error = -EBUSY;
955 break;
956 }
957 }
958
959 if (error)
960 gfs2_glock_dq_uninit(t_gh);
961
962 out:
963 while (!list_empty(&list)) {
964 lfcc = list_entry(list.next, struct lfcc, list);
965 list_del(&lfcc->list);
966 gfs2_glock_dq_uninit(&lfcc->gh);
967 kfree(lfcc);
968 }
969 gfs2_glock_dq_uninit(&ji_gh);
970 return error;
971 }
972
973 /**
974 * gfs2_freeze_fs - freezes the file system
975 * @sdp: the file system
976 *
977 * This function flushes data and meta data for all machines by
978 * aquiring the transaction log exclusively. All journals are
979 * ensured to be in a clean state as well.
980 *
981 * Returns: errno
982 */
983
984 int gfs2_freeze_fs(struct gfs2_sbd *sdp)
985 {
986 int error = 0;
987
988 mutex_lock(&sdp->sd_freeze_lock);
989
990 if (!sdp->sd_freeze_count++) {
991 error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh);
992 if (error)
993 sdp->sd_freeze_count--;
994 }
995
996 mutex_unlock(&sdp->sd_freeze_lock);
997
998 return error;
999 }
1000
1001 /**
1002 * gfs2_unfreeze_fs - unfreezes the file system
1003 * @sdp: the file system
1004 *
1005 * This function allows the file system to proceed by unlocking
1006 * the exclusively held transaction lock. Other GFS2 nodes are
1007 * now free to acquire the lock shared and go on with their lives.
1008 *
1009 */
1010
1011 void gfs2_unfreeze_fs(struct gfs2_sbd *sdp)
1012 {
1013 mutex_lock(&sdp->sd_freeze_lock);
1014
1015 if (sdp->sd_freeze_count && !--sdp->sd_freeze_count)
1016 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
1017
1018 mutex_unlock(&sdp->sd_freeze_lock);
1019 }
1020
SocketAccessConTroL development