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[GFS2] Fix unlinked file handling
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / gfs2 / super.c
CommitLineData
b3b94faa
DT		 1/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3a8a9a10 3 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
b3b94faa
DT		 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>
71b86f56 15#include <linux/crc32.h>
5c676f6d 16#include <linux/gfs2_ondisk.h>
b3b94faa
DT		 17
18#include "gfs2.h"
5c676f6d
SW		 19#include "lm_interface.h"
20#include "incore.h"
b3b94faa
DT		 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"
5c676f6d 34#include "util.h"
b3b94faa
DT		 35
36/**
37 * gfs2_tune_init - Fill a gfs2_tune structure with default values
38 * @gt: tune
39 *
40 */
41
42void gfs2_tune_init(struct gfs2_tune *gt)
43{
44 spin_lock_init(&gt->gt_spin);
45
46 gt->gt_ilimit = 100;
47 gt->gt_ilimit_tries = 3;
48 gt->gt_ilimit_min = 1;
49 gt->gt_demote_secs = 300;
50 gt->gt_incore_log_blocks = 1024;
51 gt->gt_log_flush_secs = 60;
52 gt->gt_jindex_refresh_secs = 60;
53 gt->gt_scand_secs = 15;
54 gt->gt_recoverd_secs = 60;
55 gt->gt_logd_secs = 1;
56 gt->gt_quotad_secs = 5;
b3b94faa
DT		 57 gt->gt_quota_simul_sync = 64;
58 gt->gt_quota_warn_period = 10;
59 gt->gt_quota_scale_num = 1;
60 gt->gt_quota_scale_den = 1;
61 gt->gt_quota_cache_secs = 300;
62 gt->gt_quota_quantum = 60;
63 gt->gt_atime_quantum = 3600;
64 gt->gt_new_files_jdata = 0;
65 gt->gt_new_files_directio = 0;
66 gt->gt_max_atomic_write = 4 << 20;
67 gt->gt_max_readahead = 1 << 18;
68 gt->gt_lockdump_size = 131072;
69 gt->gt_stall_secs = 600;
70 gt->gt_complain_secs = 10;
71 gt->gt_reclaim_limit = 5000;
72 gt->gt_entries_per_readdir = 32;
73 gt->gt_prefetch_secs = 10;
74 gt->gt_greedy_default = HZ / 10;
75 gt->gt_greedy_quantum = HZ / 40;
76 gt->gt_greedy_max = HZ / 4;
77 gt->gt_statfs_quantum = 30;
78 gt->gt_statfs_slow = 0;
79}
80
81/**
82 * gfs2_check_sb - Check superblock
83 * @sdp: the filesystem
84 * @sb: The superblock
85 * @silent: Don't print a message if the check fails
86 *
87 * Checks the version code of the FS is one that we understand how to
88 * read and that the sizes of the various on-disk structures have not
89 * changed.
90 */
91
92int gfs2_check_sb(struct gfs2_sbd *sdp, struct gfs2_sb *sb, int silent)
93{
94 unsigned int x;
95
96 if (sb->sb_header.mh_magic != GFS2_MAGIC ||
97 sb->sb_header.mh_type != GFS2_METATYPE_SB) {
98 if (!silent)
d92a8d48 99 printk(KERN_WARNING "GFS2: not a GFS2 filesystem\n");
b3b94faa
DT		 100 return -EINVAL;
101 }
102
103 /* If format numbers match exactly, we're done. */
104
105 if (sb->sb_fs_format == GFS2_FORMAT_FS &&
106 sb->sb_multihost_format == GFS2_FORMAT_MULTI)
107 return 0;
108
109 if (sb->sb_fs_format != GFS2_FORMAT_FS) {
110 for (x = 0; gfs2_old_fs_formats[x]; x++)
111 if (gfs2_old_fs_formats[x] == sb->sb_fs_format)
112 break;
113
114 if (!gfs2_old_fs_formats[x]) {
568f4c96
SW		 115 printk(KERN_WARNING
116 "GFS2: code version (%u, %u) is incompatible "
b3b94faa
DT		 117 "with ondisk format (%u, %u)\n",
118 GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
119 sb->sb_fs_format, sb->sb_multihost_format);
568f4c96
SW		 120 printk(KERN_WARNING
121 "GFS2: I don't know how to upgrade this FS\n");
b3b94faa
DT		 122 return -EINVAL;
123 }
124 }
125
126 if (sb->sb_multihost_format != GFS2_FORMAT_MULTI) {
127 for (x = 0; gfs2_old_multihost_formats[x]; x++)
568f4c96
SW		 128 if (gfs2_old_multihost_formats[x] ==
129 sb->sb_multihost_format)
b3b94faa
DT		 130 break;
131
132 if (!gfs2_old_multihost_formats[x]) {
568f4c96
SW		 133 printk(KERN_WARNING
134 "GFS2: code version (%u, %u) is incompatible "
b3b94faa
DT		 135 "with ondisk format (%u, %u)\n",
136 GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
137 sb->sb_fs_format, sb->sb_multihost_format);
568f4c96
SW		 138 printk(KERN_WARNING
139 "GFS2: I don't know how to upgrade this FS\n");
b3b94faa
DT		 140 return -EINVAL;
141 }
142 }
143
144 if (!sdp->sd_args.ar_upgrade) {
568f4c96
SW		 145 printk(KERN_WARNING
146 "GFS2: code version (%u, %u) is incompatible "
b3b94faa
DT		 147 "with ondisk format (%u, %u)\n",
148 GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
149 sb->sb_fs_format, sb->sb_multihost_format);
568f4c96
SW		 150 printk(KERN_INFO
151 "GFS2: Use the \"upgrade\" mount option to upgrade "
b3b94faa 152 "the FS\n");
d92a8d48 153 printk(KERN_INFO "GFS2: See the manual for more details\n");
b3b94faa
DT		 154 return -EINVAL;
155 }
156
157 return 0;
158}
159
160/**
161 * gfs2_read_sb - Read super block
162 * @sdp: The GFS2 superblock
163 * @gl: the glock for the superblock (assumed to be held)
164 * @silent: Don't print message if mount fails
165 *
166 */
167
168int gfs2_read_sb(struct gfs2_sbd *sdp, struct gfs2_glock *gl, int silent)
169{
170 struct buffer_head *bh;
171 uint32_t hash_blocks, ind_blocks, leaf_blocks;
172 uint32_t tmp_blocks;
173 unsigned int x;
174 int error;
175
176 error = gfs2_meta_read(gl, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift,
177 DIO_FORCE | DIO_START | DIO_WAIT, &bh);
178 if (error) {
179 if (!silent)
180 fs_err(sdp, "can't read superblock\n");
181 return error;
182 }
183
184 gfs2_assert(sdp, sizeof(struct gfs2_sb) <= bh->b_size);
185 gfs2_sb_in(&sdp->sd_sb, bh->b_data);
186 brelse(bh);
187
188 error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
189 if (error)
190 return error;
191
192 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
193 GFS2_BASIC_BLOCK_SHIFT;
194 sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
195 sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
196 sizeof(struct gfs2_dinode)) / sizeof(uint64_t);
197 sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
198 sizeof(struct gfs2_meta_header)) / sizeof(uint64_t);
199 sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
200 sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
201 sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
202 sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(uint64_t);
b3b94faa
DT		 203 sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
204 sizeof(struct gfs2_meta_header)) /
205 sizeof(struct gfs2_quota_change);
206
207 /* Compute maximum reservation required to add a entry to a directory */
208
5c676f6d 209 hash_blocks = DIV_ROUND_UP(sizeof(uint64_t) * (1 << GFS2_DIR_MAX_DEPTH),
b3b94faa
DT		 210 sdp->sd_jbsize);
211
212 ind_blocks = 0;
213 for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
5c676f6d 214 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
b3b94faa
DT		 215 ind_blocks += tmp_blocks;
216 }
217
218 leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
219
220 sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
221
222 sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
223 sizeof(struct gfs2_dinode);
224 sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
225 for (x = 2;; x++) {
226 uint64_t space, d;
227 uint32_t m;
228
229 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
230 d = space;
231 m = do_div(d, sdp->sd_inptrs);
232
233 if (d != sdp->sd_heightsize[x - 1] || m)
234 break;
235 sdp->sd_heightsize[x] = space;
236 }
237 sdp->sd_max_height = x;
238 gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
239
240 sdp->sd_jheightsize[0] = sdp->sd_sb.sb_bsize -
241 sizeof(struct gfs2_dinode);
242 sdp->sd_jheightsize[1] = sdp->sd_jbsize * sdp->sd_diptrs;
243 for (x = 2;; x++) {
244 uint64_t space, d;
245 uint32_t m;
246
247 space = sdp->sd_jheightsize[x - 1] * sdp->sd_inptrs;
248 d = space;
249 m = do_div(d, sdp->sd_inptrs);
250
251 if (d != sdp->sd_jheightsize[x - 1] || m)
252 break;
253 sdp->sd_jheightsize[x] = space;
254 }
255 sdp->sd_max_jheight = x;
256 gfs2_assert(sdp, sdp->sd_max_jheight <= GFS2_MAX_META_HEIGHT);
257
258 return 0;
259}
260
b3b94faa
DT		 261/**
262 * gfs2_jindex_hold - Grab a lock on the jindex
263 * @sdp: The GFS2 superblock
264 * @ji_gh: the holder for the jindex glock
265 *
266 * This is very similar to the gfs2_rindex_hold() function, except that
267 * in general we hold the jindex lock for longer periods of time and
268 * we grab it far less frequently (in general) then the rgrp lock.
269 *
270 * Returns: errno
271 */
272
273int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
274{
feaa7bba 275 struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex);
b3b94faa
DT		 276 struct qstr name;
277 char buf[20];
278 struct gfs2_jdesc *jd;
279 int error;
280
281 name.name = buf;
282
f55ab26a 283 mutex_lock(&sdp->sd_jindex_mutex);
b3b94faa
DT		 284
285 for (;;) {
286 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED,
287 GL_LOCAL_EXCL, ji_gh);
288 if (error)
289 break;
290
291 name.len = sprintf(buf, "journal%u", sdp->sd_journals);
c752666c 292 name.hash = gfs2_disk_hash(name.name, name.len);
b3b94faa 293
feaa7bba 294 error = gfs2_dir_search(sdp->sd_jindex, &name, NULL, NULL);
b3b94faa
DT		 295 if (error == -ENOENT) {
296 error = 0;
297 break;
298 }
299
300 gfs2_glock_dq_uninit(ji_gh);
301
302 if (error)
303 break;
304
305 error = -ENOMEM;
306 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
307 if (!jd)
308 break;
309
c752666c
SW		 310 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1, NULL);
311 if (!jd->jd_inode || IS_ERR(jd->jd_inode)) {
312 if (!jd->jd_inode)
313 error = -ENOENT;
314 else
315 error = PTR_ERR(jd->jd_inode);
b3b94faa
DT		 316 kfree(jd);
317 break;
318 }
319
320 spin_lock(&sdp->sd_jindex_spin);
321 jd->jd_jid = sdp->sd_journals++;
322 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
323 spin_unlock(&sdp->sd_jindex_spin);
324 }
325
f55ab26a 326 mutex_unlock(&sdp->sd_jindex_mutex);
b3b94faa
DT		 327
328 return error;
329}
330
331/**
332 * gfs2_jindex_free - Clear all the journal index information
333 * @sdp: The GFS2 superblock
334 *
335 */
336
337void gfs2_jindex_free(struct gfs2_sbd *sdp)
338{
339 struct list_head list;
340 struct gfs2_jdesc *jd;
341
342 spin_lock(&sdp->sd_jindex_spin);
343 list_add(&list, &sdp->sd_jindex_list);
344 list_del_init(&sdp->sd_jindex_list);
345 sdp->sd_journals = 0;
346 spin_unlock(&sdp->sd_jindex_spin);
347
348 while (!list_empty(&list)) {
349 jd = list_entry(list.next, struct gfs2_jdesc, jd_list);
350 list_del(&jd->jd_list);
7359a19c 351 iput(jd->jd_inode);
b3b94faa
DT		 352 kfree(jd);
353 }
354}
355
356static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid)
357{
358 struct gfs2_jdesc *jd;
359 int found = 0;
360
361 list_for_each_entry(jd, head, jd_list) {
362 if (jd->jd_jid == jid) {
363 found = 1;
364 break;
365 }
366 }
367
368 if (!found)
369 jd = NULL;
370
371 return jd;
372}
373
374struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid)
375{
376 struct gfs2_jdesc *jd;
377
378 spin_lock(&sdp->sd_jindex_spin);
379 jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
380 spin_unlock(&sdp->sd_jindex_spin);
381
382 return jd;
383}
384
385void gfs2_jdesc_make_dirty(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 if (jd)
392 jd->jd_dirty = 1;
393 spin_unlock(&sdp->sd_jindex_spin);
394}
395
396struct gfs2_jdesc *gfs2_jdesc_find_dirty(struct gfs2_sbd *sdp)
397{
398 struct gfs2_jdesc *jd;
399 int found = 0;
400
401 spin_lock(&sdp->sd_jindex_spin);
402
403 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
404 if (jd->jd_dirty) {
405 jd->jd_dirty = 0;
406 found = 1;
407 break;
408 }
409 }
410 spin_unlock(&sdp->sd_jindex_spin);
411
412 if (!found)
413 jd = NULL;
414
415 return jd;
416}
417
418int gfs2_jdesc_check(struct gfs2_jdesc *jd)
419{
feaa7bba
SW		 420 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
421 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
b3b94faa
DT		 422 int ar;
423 int error;
424
feaa7bba 425 if (ip->i_di.di_size < (8 << 20) || ip->i_di.di_size > (1 << 30) ||
b3b94faa
DT		 426 (ip->i_di.di_size & (sdp->sd_sb.sb_bsize - 1))) {
427 gfs2_consist_inode(ip);
428 return -EIO;
429 }
430 jd->jd_blocks = ip->i_di.di_size >> sdp->sd_sb.sb_bsize_shift;
431
feaa7bba 432 error = gfs2_write_alloc_required(ip, 0, ip->i_di.di_size, &ar);
b3b94faa
DT		 433 if (!error && ar) {
434 gfs2_consist_inode(ip);
435 error = -EIO;
436 }
437
438 return error;
439}
440
b3b94faa
DT		 441/**
442 * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
443 * @sdp: the filesystem
444 *
445 * Returns: errno
446 */
447
448int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
449{
feaa7bba 450 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
5c676f6d 451 struct gfs2_glock *j_gl = ip->i_gl;
b3b94faa
DT		 452 struct gfs2_holder t_gh;
453 struct gfs2_log_header head;
454 int error;
455
456 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED,
579b78a4 457 GL_LOCAL_EXCL, &t_gh);
b3b94faa
DT		 458 if (error)
459 return error;
460
5c676f6d 461 gfs2_meta_cache_flush(ip);
b3b94faa
DT		 462 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA | DIO_DATA);
463
464 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
465 if (error)
466 goto fail;
467
468 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
469 gfs2_consist(sdp);
470 error = -EIO;
471 goto fail;
472 }
473
474 /* Initialize some head of the log stuff */
475 sdp->sd_log_sequence = head.lh_sequence + 1;
476 gfs2_log_pointers_init(sdp, head.lh_blkno);
477
b3b94faa
DT		 478 error = gfs2_quota_init(sdp);
479 if (error)
480 goto fail_unlinked;
481
482 set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
483
484 gfs2_glock_dq_uninit(&t_gh);
485
486 return 0;
487
488 fail_unlinked:
b3b94faa
DT		 489
490 fail:
491 t_gh.gh_flags |= GL_NOCACHE;
492 gfs2_glock_dq_uninit(&t_gh);
493
494 return error;
495}
496
497/**
498 * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
499 * @sdp: the filesystem
500 *
501 * Returns: errno
502 */
503
504int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
505{
506 struct gfs2_holder t_gh;
507 int error;
508
b3b94faa
DT		 509 gfs2_quota_sync(sdp);
510 gfs2_statfs_sync(sdp);
511
512 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED,
579b78a4 513 GL_LOCAL_EXCL | GL_NOCACHE,
b3b94faa
DT		 514 &t_gh);
515 if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
516 return error;
517
518 gfs2_meta_syncfs(sdp);
519 gfs2_log_shutdown(sdp);
520
521 clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
522
523 if (t_gh.gh_gl)
524 gfs2_glock_dq_uninit(&t_gh);
525
b3b94faa
DT		 526 gfs2_quota_cleanup(sdp);
527
528 return error;
529}
530
531int gfs2_statfs_init(struct gfs2_sbd *sdp)
532{
feaa7bba 533 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
b3b94faa 534 struct gfs2_statfs_change *m_sc = &sdp->sd_statfs_master;
feaa7bba 535 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
b3b94faa
DT		 536 struct gfs2_statfs_change *l_sc = &sdp->sd_statfs_local;
537 struct buffer_head *m_bh, *l_bh;
538 struct gfs2_holder gh;
539 int error;
540
541 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
542 &gh);
543 if (error)
544 return error;
545
546 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
547 if (error)
548 goto out;
549
550 if (sdp->sd_args.ar_spectator) {
551 spin_lock(&sdp->sd_statfs_spin);
552 gfs2_statfs_change_in(m_sc, m_bh->b_data +
553 sizeof(struct gfs2_dinode));
554 spin_unlock(&sdp->sd_statfs_spin);
555 } else {
556 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
557 if (error)
558 goto out_m_bh;
559
560 spin_lock(&sdp->sd_statfs_spin);
561 gfs2_statfs_change_in(m_sc, m_bh->b_data +
562 sizeof(struct gfs2_dinode));
563 gfs2_statfs_change_in(l_sc, l_bh->b_data +
564 sizeof(struct gfs2_dinode));
565 spin_unlock(&sdp->sd_statfs_spin);
566
567 brelse(l_bh);
568 }
569
570 out_m_bh:
571 brelse(m_bh);
572
573 out:
574 gfs2_glock_dq_uninit(&gh);
575
576 return 0;
577}
578
579void gfs2_statfs_change(struct gfs2_sbd *sdp, int64_t total, int64_t free,
580 int64_t dinodes)
581{
feaa7bba 582 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
b3b94faa
DT		 583 struct gfs2_statfs_change *l_sc = &sdp->sd_statfs_local;
584 struct buffer_head *l_bh;
585 int error;
586
587 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
588 if (error)
589 return;
590
f55ab26a 591 mutex_lock(&sdp->sd_statfs_mutex);
d4e9c4c3 592 gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
f55ab26a 593 mutex_unlock(&sdp->sd_statfs_mutex);
b3b94faa
DT		 594
595 spin_lock(&sdp->sd_statfs_spin);
596 l_sc->sc_total += total;
597 l_sc->sc_free += free;
598 l_sc->sc_dinodes += dinodes;
599 gfs2_statfs_change_out(l_sc, l_bh->b_data +
600 sizeof(struct gfs2_dinode));
601 spin_unlock(&sdp->sd_statfs_spin);
602
603 brelse(l_bh);
604}
605
606int gfs2_statfs_sync(struct gfs2_sbd *sdp)
607{
feaa7bba
SW		 608 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
609 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
b3b94faa
DT		 610 struct gfs2_statfs_change *m_sc = &sdp->sd_statfs_master;
611 struct gfs2_statfs_change *l_sc = &sdp->sd_statfs_local;
612 struct gfs2_holder gh;
613 struct buffer_head *m_bh, *l_bh;
614 int error;
615
616 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
617 &gh);
618 if (error)
619 return error;
620
621 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
622 if (error)
623 goto out;
624
625 spin_lock(&sdp->sd_statfs_spin);
626 gfs2_statfs_change_in(m_sc, m_bh->b_data +
627 sizeof(struct gfs2_dinode));
628 if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) {
629 spin_unlock(&sdp->sd_statfs_spin);
630 goto out_bh;
631 }
632 spin_unlock(&sdp->sd_statfs_spin);
633
634 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
635 if (error)
636 goto out_bh;
637
638 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
639 if (error)
640 goto out_bh2;
641
f55ab26a 642 mutex_lock(&sdp->sd_statfs_mutex);
d4e9c4c3 643 gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
f55ab26a 644 mutex_unlock(&sdp->sd_statfs_mutex);
b3b94faa
DT		 645
646 spin_lock(&sdp->sd_statfs_spin);
647 m_sc->sc_total += l_sc->sc_total;
648 m_sc->sc_free += l_sc->sc_free;
649 m_sc->sc_dinodes += l_sc->sc_dinodes;
650 memset(l_sc, 0, sizeof(struct gfs2_statfs_change));
651 memset(l_bh->b_data + sizeof(struct gfs2_dinode),
652 0, sizeof(struct gfs2_statfs_change));
653 spin_unlock(&sdp->sd_statfs_spin);
654
d4e9c4c3 655 gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
b3b94faa
DT		 656 gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
657
658 gfs2_trans_end(sdp);
659
660 out_bh2:
661 brelse(l_bh);
662
663 out_bh:
664 brelse(m_bh);
665
666 out:
667 gfs2_glock_dq_uninit(&gh);
668
669 return error;
670}
671
672/**
673 * gfs2_statfs_i - Do a statfs
674 * @sdp: the filesystem
675 * @sg: the sg structure
676 *
677 * Returns: errno
678 */
679
680int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change *sc)
681{
682 struct gfs2_statfs_change *m_sc = &sdp->sd_statfs_master;
683 struct gfs2_statfs_change *l_sc = &sdp->sd_statfs_local;
684
685 spin_lock(&sdp->sd_statfs_spin);
686
687 *sc = *m_sc;
688 sc->sc_total += l_sc->sc_total;
689 sc->sc_free += l_sc->sc_free;
690 sc->sc_dinodes += l_sc->sc_dinodes;
691
692 spin_unlock(&sdp->sd_statfs_spin);
693
694 if (sc->sc_free < 0)
695 sc->sc_free = 0;
696 if (sc->sc_free > sc->sc_total)
697 sc->sc_free = sc->sc_total;
698 if (sc->sc_dinodes < 0)
699 sc->sc_dinodes = 0;
700
701 return 0;
702}
703
704/**
705 * statfs_fill - fill in the sg for a given RG
706 * @rgd: the RG
707 * @sc: the sc structure
708 *
709 * Returns: 0 on success, -ESTALE if the LVB is invalid
710 */
711
712static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
713 struct gfs2_statfs_change *sc)
714{
715 gfs2_rgrp_verify(rgd);
716 sc->sc_total += rgd->rd_ri.ri_data;
717 sc->sc_free += rgd->rd_rg.rg_free;
718 sc->sc_dinodes += rgd->rd_rg.rg_dinodes;
719 return 0;
720}
721
722/**
723 * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
724 * @sdp: the filesystem
725 * @sc: the sc info that will be returned
726 *
727 * Any error (other than a signal) will cause this routine to fall back
728 * to the synchronous version.
729 *
730 * FIXME: This really shouldn't busy wait like this.
731 *
732 * Returns: errno
733 */
734
735int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change *sc)
736{
737 struct gfs2_holder ri_gh;
738 struct gfs2_rgrpd *rgd_next;
739 struct gfs2_holder *gha, *gh;
740 unsigned int slots = 64;
741 unsigned int x;
742 int done;
743 int error = 0, err;
744
745 memset(sc, 0, sizeof(struct gfs2_statfs_change));
746 gha = kcalloc(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
747 if (!gha)
748 return -ENOMEM;
749
750 error = gfs2_rindex_hold(sdp, &ri_gh);
751 if (error)
752 goto out;
753
754 rgd_next = gfs2_rgrpd_get_first(sdp);
755
756 for (;;) {
757 done = 1;
758
759 for (x = 0; x < slots; x++) {
760 gh = gha + x;
761
762 if (gh->gh_gl && gfs2_glock_poll(gh)) {
763 err = gfs2_glock_wait(gh);
764 if (err) {
765 gfs2_holder_uninit(gh);
766 error = err;
767 } else {
768 if (!error)
5c676f6d
SW		 769 error = statfs_slow_fill(
770 gh->gh_gl->gl_object, sc);
b3b94faa
DT		 771 gfs2_glock_dq_uninit(gh);
772 }
773 }
774
775 if (gh->gh_gl)
776 done = 0;
777 else if (rgd_next && !error) {
778 error = gfs2_glock_nq_init(rgd_next->rd_gl,
779 LM_ST_SHARED,
780 GL_ASYNC,
781 gh);
782 rgd_next = gfs2_rgrpd_get_next(rgd_next);
783 done = 0;
784 }
785
786 if (signal_pending(current))
787 error = -ERESTARTSYS;
788 }
789
790 if (done)
791 break;
792
793 yield();
794 }
795
796 gfs2_glock_dq_uninit(&ri_gh);
797
798 out:
799 kfree(gha);
800
801 return error;
802}
803
804struct lfcc {
805 struct list_head list;
806 struct gfs2_holder gh;
807};
808
809/**
810 * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
811 * journals are clean
812 * @sdp: the file system
813 * @state: the state to put the transaction lock into
814 * @t_gh: the hold on the transaction lock
815 *
816 * Returns: errno
817 */
818
08bc2dbc
AB		 819static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp,
820 struct gfs2_holder *t_gh)
b3b94faa 821{
5c676f6d 822 struct gfs2_inode *ip;
b3b94faa
DT		 823 struct gfs2_holder ji_gh;
824 struct gfs2_jdesc *jd;
825 struct lfcc *lfcc;
826 LIST_HEAD(list);
827 struct gfs2_log_header lh;
828 int error;
829
830 error = gfs2_jindex_hold(sdp, &ji_gh);
831 if (error)
832 return error;
833
834 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
835 lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
836 if (!lfcc) {
837 error = -ENOMEM;
838 goto out;
839 }
feaa7bba
SW		 840 ip = GFS2_I(jd->jd_inode);
841 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh);
b3b94faa
DT		 842 if (error) {
843 kfree(lfcc);
844 goto out;
845 }
846 list_add(&lfcc->list, &list);
847 }
848
849 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_DEFERRED,
579b78a4 850 LM_FLAG_PRIORITY | GL_NOCACHE,
b3b94faa
DT		 851 t_gh);
852
853 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
854 error = gfs2_jdesc_check(jd);
855 if (error)
856 break;
857 error = gfs2_find_jhead(jd, &lh);
858 if (error)
859 break;
860 if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
861 error = -EBUSY;
862 break;
863 }
864 }
865
866 if (error)
867 gfs2_glock_dq_uninit(t_gh);
868
869 out:
870 while (!list_empty(&list)) {
871 lfcc = list_entry(list.next, struct lfcc, list);
872 list_del(&lfcc->list);
873 gfs2_glock_dq_uninit(&lfcc->gh);
874 kfree(lfcc);
875 }
876 gfs2_glock_dq_uninit(&ji_gh);
877
878 return error;
879}
880
881/**
882 * gfs2_freeze_fs - freezes the file system
883 * @sdp: the file system
884 *
885 * This function flushes data and meta data for all machines by
886 * aquiring the transaction log exclusively. All journals are
887 * ensured to be in a clean state as well.
888 *
889 * Returns: errno
890 */
891
892int gfs2_freeze_fs(struct gfs2_sbd *sdp)
893{
894 int error = 0;
895
f55ab26a 896 mutex_lock(&sdp->sd_freeze_lock);
b3b94faa
DT		 897
898 if (!sdp->sd_freeze_count++) {
899 error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh);
900 if (error)
901 sdp->sd_freeze_count--;
902 }
903
f55ab26a 904 mutex_unlock(&sdp->sd_freeze_lock);
b3b94faa
DT		 905
906 return error;
907}
908
909/**
910 * gfs2_unfreeze_fs - unfreezes the file system
911 * @sdp: the file system
912 *
913 * This function allows the file system to proceed by unlocking
914 * the exclusively held transaction lock. Other GFS2 nodes are
915 * now free to acquire the lock shared and go on with their lives.
916 *
917 */
918
919void gfs2_unfreeze_fs(struct gfs2_sbd *sdp)
920{
f55ab26a 921 mutex_lock(&sdp->sd_freeze_lock);
b3b94faa
DT		 922
923 if (sdp->sd_freeze_count && !--sdp->sd_freeze_count)
924 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
925
f55ab26a 926 mutex_unlock(&sdp->sd_freeze_lock);
b3b94faa
DT		 927}
928
kernel source for telekom puls (alcatel/mediatek)