~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/fs/gfs2/super.c

Version: ~ [ linux-5.8 ] ~ [ linux-5.7.12 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.55 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.136 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.191 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.232 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.232 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.85 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 11 
 12 #include <linux/bio.h>
 13 #include <linux/sched.h>
 14 #include <linux/slab.h>
 15 #include <linux/spinlock.h>
 16 #include <linux/completion.h>
 17 #include <linux/buffer_head.h>
 18 #include <linux/statfs.h>
 19 #include <linux/seq_file.h>
 20 #include <linux/mount.h>
 21 #include <linux/kthread.h>
 22 #include <linux/delay.h>
 23 #include <linux/gfs2_ondisk.h>
 24 #include <linux/crc32.h>
 25 #include <linux/time.h>
 26 #include <linux/wait.h>
 27 #include <linux/writeback.h>
 28 #include <linux/backing-dev.h>
 29 
 30 #include "gfs2.h"
 31 #include "incore.h"
 32 #include "bmap.h"
 33 #include "dir.h"
 34 #include "glock.h"
 35 #include "glops.h"
 36 #include "inode.h"
 37 #include "log.h"
 38 #include "meta_io.h"
 39 #include "quota.h"
 40 #include "recovery.h"
 41 #include "rgrp.h"
 42 #include "super.h"
 43 #include "trans.h"
 44 #include "util.h"
 45 #include "sys.h"
 46 #include "xattr.h"
 47 
 48 #define args_neq(a1, a2, x) ((a1)->ar_##x != (a2)->ar_##x)
 49 
 50 enum {
 51         Opt_lockproto,
 52         Opt_locktable,
 53         Opt_hostdata,
 54         Opt_spectator,
 55         Opt_ignore_local_fs,
 56         Opt_localflocks,
 57         Opt_localcaching,
 58         Opt_debug,
 59         Opt_nodebug,
 60         Opt_upgrade,
 61         Opt_acl,
 62         Opt_noacl,
 63         Opt_quota_off,
 64         Opt_quota_account,
 65         Opt_quota_on,
 66         Opt_quota,
 67         Opt_noquota,
 68         Opt_suiddir,
 69         Opt_nosuiddir,
 70         Opt_data_writeback,
 71         Opt_data_ordered,
 72         Opt_meta,
 73         Opt_discard,
 74         Opt_nodiscard,
 75         Opt_commit,
 76         Opt_err_withdraw,
 77         Opt_err_panic,
 78         Opt_statfs_quantum,
 79         Opt_statfs_percent,
 80         Opt_quota_quantum,
 81         Opt_barrier,
 82         Opt_nobarrier,
 83         Opt_rgrplvb,
 84         Opt_norgrplvb,
 85         Opt_error,
 86 };
 87 
 88 static const match_table_t tokens = {
 89         {Opt_lockproto, "lockproto=%s"},
 90         {Opt_locktable, "locktable=%s"},
 91         {Opt_hostdata, "hostdata=%s"},
 92         {Opt_spectator, "spectator"},
 93         {Opt_spectator, "norecovery"},
 94         {Opt_ignore_local_fs, "ignore_local_fs"},
 95         {Opt_localflocks, "localflocks"},
 96         {Opt_localcaching, "localcaching"},
 97         {Opt_debug, "debug"},
 98         {Opt_nodebug, "nodebug"},
 99         {Opt_upgrade, "upgrade"},
100         {Opt_acl, "acl"},
101         {Opt_noacl, "noacl"},
102         {Opt_quota_off, "quota=off"},
103         {Opt_quota_account, "quota=account"},
104         {Opt_quota_on, "quota=on"},
105         {Opt_quota, "quota"},
106         {Opt_noquota, "noquota"},
107         {Opt_suiddir, "suiddir"},
108         {Opt_nosuiddir, "nosuiddir"},
109         {Opt_data_writeback, "data=writeback"},
110         {Opt_data_ordered, "data=ordered"},
111         {Opt_meta, "meta"},
112         {Opt_discard, "discard"},
113         {Opt_nodiscard, "nodiscard"},
114         {Opt_commit, "commit=%d"},
115         {Opt_err_withdraw, "errors=withdraw"},
116         {Opt_err_panic, "errors=panic"},
117         {Opt_statfs_quantum, "statfs_quantum=%d"},
118         {Opt_statfs_percent, "statfs_percent=%d"},
119         {Opt_quota_quantum, "quota_quantum=%d"},
120         {Opt_barrier, "barrier"},
121         {Opt_nobarrier, "nobarrier"},
122         {Opt_rgrplvb, "rgrplvb"},
123         {Opt_norgrplvb, "norgrplvb"},
124         {Opt_error, NULL}
125 };
126 
127 /**
128  * gfs2_mount_args - Parse mount options
129  * @args: The structure into which the parsed options will be written
130  * @options: The options to parse
131  *
132  * Return: errno
133  */
134 
135 int gfs2_mount_args(struct gfs2_args *args, char *options)
136 {
137         char *o;
138         int token;
139         substring_t tmp[MAX_OPT_ARGS];
140         int rv;
141 
142         /* Split the options into tokens with the "," character and
143            process them */
144 
145         while (1) {
146                 o = strsep(&options, ",");
147                 if (o == NULL)
148                         break;
149                 if (*o == '\0')
150                         continue;
151 
152                 token = match_token(o, tokens, tmp);
153                 switch (token) {
154                 case Opt_lockproto:
155                         match_strlcpy(args->ar_lockproto, &tmp[0],
156                                       GFS2_LOCKNAME_LEN);
157                         break;
158                 case Opt_locktable:
159                         match_strlcpy(args->ar_locktable, &tmp[0],
160                                       GFS2_LOCKNAME_LEN);
161                         break;
162                 case Opt_hostdata:
163                         match_strlcpy(args->ar_hostdata, &tmp[0],
164                                       GFS2_LOCKNAME_LEN);
165                         break;
166                 case Opt_spectator:
167                         args->ar_spectator = 1;
168                         break;
169                 case Opt_ignore_local_fs:
170                         /* Retained for backwards compat only */
171                         break;
172                 case Opt_localflocks:
173                         args->ar_localflocks = 1;
174                         break;
175                 case Opt_localcaching:
176                         /* Retained for backwards compat only */
177                         break;
178                 case Opt_debug:
179                         if (args->ar_errors == GFS2_ERRORS_PANIC) {
180                                 pr_warn("-o debug and -o errors=panic are mutually exclusive\n");
181                                 return -EINVAL;
182                         }
183                         args->ar_debug = 1;
184                         break;
185                 case Opt_nodebug:
186                         args->ar_debug = 0;
187                         break;
188                 case Opt_upgrade:
189                         /* Retained for backwards compat only */
190                         break;
191                 case Opt_acl:
192                         args->ar_posix_acl = 1;
193                         break;
194                 case Opt_noacl:
195                         args->ar_posix_acl = 0;
196                         break;
197                 case Opt_quota_off:
198                 case Opt_noquota:
199                         args->ar_quota = GFS2_QUOTA_OFF;
200                         break;
201                 case Opt_quota_account:
202                         args->ar_quota = GFS2_QUOTA_ACCOUNT;
203                         break;
204                 case Opt_quota_on:
205                 case Opt_quota:
206                         args->ar_quota = GFS2_QUOTA_ON;
207                         break;
208                 case Opt_suiddir:
209                         args->ar_suiddir = 1;
210                         break;
211                 case Opt_nosuiddir:
212                         args->ar_suiddir = 0;
213                         break;
214                 case Opt_data_writeback:
215                         args->ar_data = GFS2_DATA_WRITEBACK;
216                         break;
217                 case Opt_data_ordered:
218                         args->ar_data = GFS2_DATA_ORDERED;
219                         break;
220                 case Opt_meta:
221                         args->ar_meta = 1;
222                         break;
223                 case Opt_discard:
224                         args->ar_discard = 1;
225                         break;
226                 case Opt_nodiscard:
227                         args->ar_discard = 0;
228                         break;
229                 case Opt_commit:
230                         rv = match_int(&tmp[0], &args->ar_commit);
231                         if (rv || args->ar_commit <= 0) {
232                                 pr_warn("commit mount option requires a positive numeric argument\n");
233                                 return rv ? rv : -EINVAL;
234                         }
235                         break;
236                 case Opt_statfs_quantum:
237                         rv = match_int(&tmp[0], &args->ar_statfs_quantum);
238                         if (rv || args->ar_statfs_quantum < 0) {
239                                 pr_warn("statfs_quantum mount option requires a non-negative numeric argument\n");
240                                 return rv ? rv : -EINVAL;
241                         }
242                         break;
243                 case Opt_quota_quantum:
244                         rv = match_int(&tmp[0], &args->ar_quota_quantum);
245                         if (rv || args->ar_quota_quantum <= 0) {
246                                 pr_warn("quota_quantum mount option requires a positive numeric argument\n");
247                                 return rv ? rv : -EINVAL;
248                         }
249                         break;
250                 case Opt_statfs_percent:
251                         rv = match_int(&tmp[0], &args->ar_statfs_percent);
252                         if (rv || args->ar_statfs_percent < 0 ||
253                             args->ar_statfs_percent > 100) {
254                                 pr_warn("statfs_percent mount option requires a numeric argument between 0 and 100\n");
255                                 return rv ? rv : -EINVAL;
256                         }
257                         break;
258                 case Opt_err_withdraw:
259                         args->ar_errors = GFS2_ERRORS_WITHDRAW;
260                         break;
261                 case Opt_err_panic:
262                         if (args->ar_debug) {
263                                 pr_warn("-o debug and -o errors=panic are mutually exclusive\n");
264                                 return -EINVAL;
265                         }
266                         args->ar_errors = GFS2_ERRORS_PANIC;
267                         break;
268                 case Opt_barrier:
269                         args->ar_nobarrier = 0;
270                         break;
271                 case Opt_nobarrier:
272                         args->ar_nobarrier = 1;
273                         break;
274                 case Opt_rgrplvb:
275                         args->ar_rgrplvb = 1;
276                         break;
277                 case Opt_norgrplvb:
278                         args->ar_rgrplvb = 0;
279                         break;
280                 case Opt_error:
281                 default:
282                         pr_warn("invalid mount option: %s\n", o);
283                         return -EINVAL;
284                 }
285         }
286 
287         return 0;
288 }
289 
290 /**
291  * gfs2_jindex_free - Clear all the journal index information
292  * @sdp: The GFS2 superblock
293  *
294  */
295 
296 void gfs2_jindex_free(struct gfs2_sbd *sdp)
297 {
298         struct list_head list;
299         struct gfs2_jdesc *jd;
300 
301         spin_lock(&sdp->sd_jindex_spin);
302         list_add(&list, &sdp->sd_jindex_list);
303         list_del_init(&sdp->sd_jindex_list);
304         sdp->sd_journals = 0;
305         spin_unlock(&sdp->sd_jindex_spin);
306 
307         while (!list_empty(&list)) {
308                 jd = list_entry(list.next, struct gfs2_jdesc, jd_list);
309                 gfs2_free_journal_extents(jd);
310                 list_del(&jd->jd_list);
311                 iput(jd->jd_inode);
312                 kfree(jd);
313         }
314 }
315 
316 static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid)
317 {
318         struct gfs2_jdesc *jd;
319         int found = 0;
320 
321         list_for_each_entry(jd, head, jd_list) {
322                 if (jd->jd_jid == jid) {
323                         found = 1;
324                         break;
325                 }
326         }
327 
328         if (!found)
329                 jd = NULL;
330 
331         return jd;
332 }
333 
334 struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid)
335 {
336         struct gfs2_jdesc *jd;
337 
338         spin_lock(&sdp->sd_jindex_spin);
339         jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
340         spin_unlock(&sdp->sd_jindex_spin);
341 
342         return jd;
343 }
344 
345 int gfs2_jdesc_check(struct gfs2_jdesc *jd)
346 {
347         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
348         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
349         u64 size = i_size_read(jd->jd_inode);
350 
351         if (gfs2_check_internal_file_size(jd->jd_inode, 8 << 20, 1 << 30))
352                 return -EIO;
353 
354         jd->jd_blocks = size >> sdp->sd_sb.sb_bsize_shift;
355 
356         if (gfs2_write_alloc_required(ip, 0, size)) {
357                 gfs2_consist_inode(ip);
358                 return -EIO;
359         }
360 
361         return 0;
362 }
363 
364 static int init_threads(struct gfs2_sbd *sdp)
365 {
366         struct task_struct *p;
367         int error = 0;
368 
369         p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
370         if (IS_ERR(p)) {
371                 error = PTR_ERR(p);
372                 fs_err(sdp, "can't start logd thread: %d\n", error);
373                 return error;
374         }
375         sdp->sd_logd_process = p;
376 
377         p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
378         if (IS_ERR(p)) {
379                 error = PTR_ERR(p);
380                 fs_err(sdp, "can't start quotad thread: %d\n", error);
381                 goto fail;
382         }
383         sdp->sd_quotad_process = p;
384         return 0;
385 
386 fail:
387         kthread_stop(sdp->sd_logd_process);
388         return error;
389 }
390 
391 /**
392  * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
393  * @sdp: the filesystem
394  *
395  * Returns: errno
396  */
397 
398 int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
399 {
400         struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
401         struct gfs2_glock *j_gl = ip->i_gl;
402         struct gfs2_holder thaw_gh;
403         struct gfs2_log_header_host head;
404         int error;
405 
406         error = init_threads(sdp);
407         if (error)
408                 return error;
409 
410         error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, 0,
411                                    &thaw_gh);
412         if (error)
413                 goto fail_threads;
414 
415         j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
416 
417         error = gfs2_find_jhead(sdp->sd_jdesc, &head);
418         if (error)
419                 goto fail;
420 
421         if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
422                 gfs2_consist(sdp);
423                 error = -EIO;
424                 goto fail;
425         }
426 
427         /*  Initialize some head of the log stuff  */
428         sdp->sd_log_sequence = head.lh_sequence + 1;
429         gfs2_log_pointers_init(sdp, head.lh_blkno);
430 
431         error = gfs2_quota_init(sdp);
432         if (error)
433                 goto fail;
434 
435         set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
436 
437         gfs2_glock_dq_uninit(&thaw_gh);
438 
439         return 0;
440 
441 fail:
442         thaw_gh.gh_flags |= GL_NOCACHE;
443         gfs2_glock_dq_uninit(&thaw_gh);
444 fail_threads:
445         kthread_stop(sdp->sd_quotad_process);
446         kthread_stop(sdp->sd_logd_process);
447         return error;
448 }
449 
450 void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf)
451 {
452         const struct gfs2_statfs_change *str = buf;
453 
454         sc->sc_total = be64_to_cpu(str->sc_total);
455         sc->sc_free = be64_to_cpu(str->sc_free);
456         sc->sc_dinodes = be64_to_cpu(str->sc_dinodes);
457 }
458 
459 static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf)
460 {
461         struct gfs2_statfs_change *str = buf;
462 
463         str->sc_total = cpu_to_be64(sc->sc_total);
464         str->sc_free = cpu_to_be64(sc->sc_free);
465         str->sc_dinodes = cpu_to_be64(sc->sc_dinodes);
466 }
467 
468 int gfs2_statfs_init(struct gfs2_sbd *sdp)
469 {
470         struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
471         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
472         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
473         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
474         struct buffer_head *m_bh, *l_bh;
475         struct gfs2_holder gh;
476         int error;
477 
478         error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
479                                    &gh);
480         if (error)
481                 return error;
482 
483         error = gfs2_meta_inode_buffer(m_ip, &m_bh);
484         if (error)
485                 goto out;
486 
487         if (sdp->sd_args.ar_spectator) {
488                 spin_lock(&sdp->sd_statfs_spin);
489                 gfs2_statfs_change_in(m_sc, m_bh->b_data +
490                                       sizeof(struct gfs2_dinode));
491                 spin_unlock(&sdp->sd_statfs_spin);
492         } else {
493                 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
494                 if (error)
495                         goto out_m_bh;
496 
497                 spin_lock(&sdp->sd_statfs_spin);
498                 gfs2_statfs_change_in(m_sc, m_bh->b_data +
499                                       sizeof(struct gfs2_dinode));
500                 gfs2_statfs_change_in(l_sc, l_bh->b_data +
501                                       sizeof(struct gfs2_dinode));
502                 spin_unlock(&sdp->sd_statfs_spin);
503 
504                 brelse(l_bh);
505         }
506 
507 out_m_bh:
508         brelse(m_bh);
509 out:
510         gfs2_glock_dq_uninit(&gh);
511         return 0;
512 }
513 
514 void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free,
515                         s64 dinodes)
516 {
517         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
518         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
519         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
520         struct buffer_head *l_bh;
521         s64 x, y;
522         int need_sync = 0;
523         int error;
524 
525         error = gfs2_meta_inode_buffer(l_ip, &l_bh);
526         if (error)
527                 return;
528 
529         gfs2_trans_add_meta(l_ip->i_gl, l_bh);
530 
531         spin_lock(&sdp->sd_statfs_spin);
532         l_sc->sc_total += total;
533         l_sc->sc_free += free;
534         l_sc->sc_dinodes += dinodes;
535         gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode));
536         if (sdp->sd_args.ar_statfs_percent) {
537                 x = 100 * l_sc->sc_free;
538                 y = m_sc->sc_free * sdp->sd_args.ar_statfs_percent;
539                 if (x >= y || x <= -y)
540                         need_sync = 1;
541         }
542         spin_unlock(&sdp->sd_statfs_spin);
543 
544         brelse(l_bh);
545         if (need_sync)
546                 gfs2_wake_up_statfs(sdp);
547 }
548 
549 void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh,
550                    struct buffer_head *l_bh)
551 {
552         struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
553         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
554         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
555         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
556 
557         gfs2_trans_add_meta(l_ip->i_gl, l_bh);
558 
559         spin_lock(&sdp->sd_statfs_spin);
560         m_sc->sc_total += l_sc->sc_total;
561         m_sc->sc_free += l_sc->sc_free;
562         m_sc->sc_dinodes += l_sc->sc_dinodes;
563         memset(l_sc, 0, sizeof(struct gfs2_statfs_change));
564         memset(l_bh->b_data + sizeof(struct gfs2_dinode),
565                0, sizeof(struct gfs2_statfs_change));
566         spin_unlock(&sdp->sd_statfs_spin);
567 
568         gfs2_trans_add_meta(m_ip->i_gl, m_bh);
569         gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
570 }
571 
572 int gfs2_statfs_sync(struct super_block *sb, int type)
573 {
574         struct gfs2_sbd *sdp = sb->s_fs_info;
575         struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
576         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
577         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
578         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
579         struct gfs2_holder gh;
580         struct buffer_head *m_bh, *l_bh;
581         int error;
582 
583         error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
584                                    &gh);
585         if (error)
586                 return error;
587 
588         error = gfs2_meta_inode_buffer(m_ip, &m_bh);
589         if (error)
590                 goto out;
591 
592         spin_lock(&sdp->sd_statfs_spin);
593         gfs2_statfs_change_in(m_sc, m_bh->b_data +
594                               sizeof(struct gfs2_dinode));
595         if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) {
596                 spin_unlock(&sdp->sd_statfs_spin);
597                 goto out_bh;
598         }
599         spin_unlock(&sdp->sd_statfs_spin);
600 
601         error = gfs2_meta_inode_buffer(l_ip, &l_bh);
602         if (error)
603                 goto out_bh;
604 
605         error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
606         if (error)
607                 goto out_bh2;
608 
609         update_statfs(sdp, m_bh, l_bh);
610         sdp->sd_statfs_force_sync = 0;
611 
612         gfs2_trans_end(sdp);
613 
614 out_bh2:
615         brelse(l_bh);
616 out_bh:
617         brelse(m_bh);
618 out:
619         gfs2_glock_dq_uninit(&gh);
620         return error;
621 }
622 
623 struct lfcc {
624         struct list_head list;
625         struct gfs2_holder gh;
626 };
627 
628 /**
629  * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
630  *                            journals are clean
631  * @sdp: the file system
632  * @state: the state to put the transaction lock into
633  * @t_gh: the hold on the transaction lock
634  *
635  * Returns: errno
636  */
637 
638 static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp,
639                                     struct gfs2_holder *freeze_gh)
640 {
641         struct gfs2_inode *ip;
642         struct gfs2_jdesc *jd;
643         struct lfcc *lfcc;
644         LIST_HEAD(list);
645         struct gfs2_log_header_host lh;
646         struct gfs2_inode *dip = GFS2_I(sdp->sd_root_dir->d_inode);
647         int error;
648 
649         error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0,
650                                    &sdp->sd_freeze_root_gh);
651         if (error)
652                 return error;
653         atomic_set(&sdp->sd_frozen_root, 1);
654         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
655                 lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
656                 if (!lfcc) {
657                         error = -ENOMEM;
658                         goto out;
659                 }
660                 ip = GFS2_I(jd->jd_inode);
661                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh);
662                 if (error) {
663                         kfree(lfcc);
664                         goto out;
665                 }
666                 list_add(&lfcc->list, &list);
667         }
668 
669         error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_EXCLUSIVE,
670                                    GL_NOCACHE, freeze_gh);
671 
672         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
673                 error = gfs2_jdesc_check(jd);
674                 if (error)
675                         break;
676                 error = gfs2_find_jhead(jd, &lh);
677                 if (error)
678                         break;
679                 if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
680                         error = -EBUSY;
681                         break;
682                 }
683         }
684 
685         if (error)
686                 gfs2_glock_dq_uninit(freeze_gh);
687 
688 out:
689         while (!list_empty(&list)) {
690                 lfcc = list_entry(list.next, struct lfcc, list);
691                 list_del(&lfcc->list);
692                 gfs2_glock_dq_uninit(&lfcc->gh);
693                 kfree(lfcc);
694         }
695         if (error) {
696                 atomic_dec(&sdp->sd_frozen_root);
697                 wait_event(sdp->sd_frozen_root_wait, atomic_read(&sdp->sd_frozen_root) == 0);
698                 gfs2_glock_dq_uninit(&sdp->sd_freeze_root_gh);
699         }
700         return error;
701 }
702 
703 void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf)
704 {
705         struct gfs2_dinode *str = buf;
706 
707         str->di_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
708         str->di_header.mh_type = cpu_to_be32(GFS2_METATYPE_DI);
709         str->di_header.mh_format = cpu_to_be32(GFS2_FORMAT_DI);
710         str->di_num.no_addr = cpu_to_be64(ip->i_no_addr);
711         str->di_num.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino);
712         str->di_mode = cpu_to_be32(ip->i_inode.i_mode);
713         str->di_uid = cpu_to_be32(i_uid_read(&ip->i_inode));
714         str->di_gid = cpu_to_be32(i_gid_read(&ip->i_inode));
715         str->di_nlink = cpu_to_be32(ip->i_inode.i_nlink);
716         str->di_size = cpu_to_be64(i_size_read(&ip->i_inode));
717         str->di_blocks = cpu_to_be64(gfs2_get_inode_blocks(&ip->i_inode));
718         str->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec);
719         str->di_mtime = cpu_to_be64(ip->i_inode.i_mtime.tv_sec);
720         str->di_ctime = cpu_to_be64(ip->i_inode.i_ctime.tv_sec);
721 
722         str->di_goal_meta = cpu_to_be64(ip->i_goal);
723         str->di_goal_data = cpu_to_be64(ip->i_goal);
724         str->di_generation = cpu_to_be64(ip->i_generation);
725 
726         str->di_flags = cpu_to_be32(ip->i_diskflags);
727         str->di_height = cpu_to_be16(ip->i_height);
728         str->di_payload_format = cpu_to_be32(S_ISDIR(ip->i_inode.i_mode) &&
729                                              !(ip->i_diskflags & GFS2_DIF_EXHASH) ?
730                                              GFS2_FORMAT_DE : 0);
731         str->di_depth = cpu_to_be16(ip->i_depth);
732         str->di_entries = cpu_to_be32(ip->i_entries);
733 
734         str->di_eattr = cpu_to_be64(ip->i_eattr);
735         str->di_atime_nsec = cpu_to_be32(ip->i_inode.i_atime.tv_nsec);
736         str->di_mtime_nsec = cpu_to_be32(ip->i_inode.i_mtime.tv_nsec);
737         str->di_ctime_nsec = cpu_to_be32(ip->i_inode.i_ctime.tv_nsec);
738 }
739 
740 /**
741  * gfs2_write_inode - Make sure the inode is stable on the disk
742  * @inode: The inode
743  * @wbc: The writeback control structure
744  *
745  * Returns: errno
746  */
747 
748 static int gfs2_write_inode(struct inode *inode, struct writeback_control *wbc)
749 {
750         struct gfs2_inode *ip = GFS2_I(inode);
751         struct gfs2_sbd *sdp = GFS2_SB(inode);
752         struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl);
753         struct backing_dev_info *bdi = metamapping->backing_dev_info;
754         int ret = 0;
755 
756         if (wbc->sync_mode == WB_SYNC_ALL)
757                 gfs2_log_flush(GFS2_SB(inode), ip->i_gl, NORMAL_FLUSH);
758         if (bdi->dirty_exceeded)
759                 gfs2_ail1_flush(sdp, wbc);
760         else
761                 filemap_fdatawrite(metamapping);
762         if (wbc->sync_mode == WB_SYNC_ALL)
763                 ret = filemap_fdatawait(metamapping);
764         if (ret)
765                 mark_inode_dirty_sync(inode);
766         return ret;
767 }
768 
769 /**
770  * gfs2_dirty_inode - check for atime updates
771  * @inode: The inode in question
772  * @flags: The type of dirty
773  *
774  * Unfortunately it can be called under any combination of inode
775  * glock and transaction lock, so we have to check carefully.
776  *
777  * At the moment this deals only with atime - it should be possible
778  * to expand that role in future, once a review of the locking has
779  * been carried out.
780  */
781 
782 static void gfs2_dirty_inode(struct inode *inode, int flags)
783 {
784         struct gfs2_inode *ip = GFS2_I(inode);
785         struct gfs2_sbd *sdp = GFS2_SB(inode);
786         struct buffer_head *bh;
787         struct gfs2_holder gh;
788         int need_unlock = 0;
789         int need_endtrans = 0;
790         int ret;
791 
792         if (!(flags & (I_DIRTY_DATASYNC|I_DIRTY_SYNC)))
793                 return;
794 
795         if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
796                 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
797                 if (ret) {
798                         fs_err(sdp, "dirty_inode: glock %d\n", ret);
799                         return;
800                 }
801                 need_unlock = 1;
802         } else if (WARN_ON_ONCE(ip->i_gl->gl_state != LM_ST_EXCLUSIVE))
803                 return;
804 
805         if (current->journal_info == NULL) {
806                 ret = gfs2_trans_begin(sdp, RES_DINODE, 0);
807                 if (ret) {
808                         fs_err(sdp, "dirty_inode: gfs2_trans_begin %d\n", ret);
809                         goto out;
810                 }
811                 need_endtrans = 1;
812         }
813 
814         ret = gfs2_meta_inode_buffer(ip, &bh);
815         if (ret == 0) {
816                 gfs2_trans_add_meta(ip->i_gl, bh);
817                 gfs2_dinode_out(ip, bh->b_data);
818                 brelse(bh);
819         }
820 
821         if (need_endtrans)
822                 gfs2_trans_end(sdp);
823 out:
824         if (need_unlock)
825                 gfs2_glock_dq_uninit(&gh);
826 }
827 
828 /**
829  * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
830  * @sdp: the filesystem
831  *
832  * Returns: errno
833  */
834 
835 static int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
836 {
837         struct gfs2_holder thaw_gh;
838         int error;
839 
840         error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, GL_NOCACHE,
841                                    &thaw_gh);
842         if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
843                 return error;
844 
845         down_write(&sdp->sd_log_flush_lock);
846         clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
847         up_write(&sdp->sd_log_flush_lock);
848 
849         kthread_stop(sdp->sd_quotad_process);
850         kthread_stop(sdp->sd_logd_process);
851 
852         flush_workqueue(gfs2_delete_workqueue);
853         gfs2_quota_sync(sdp->sd_vfs, 0);
854         gfs2_statfs_sync(sdp->sd_vfs, 0);
855 
856         gfs2_log_flush(sdp, NULL, SHUTDOWN_FLUSH);
857         gfs2_assert_warn(sdp, atomic_read(&sdp->sd_log_blks_free) == sdp->sd_jdesc->jd_blocks);
858 
859         if (thaw_gh.gh_gl)
860                 gfs2_glock_dq_uninit(&thaw_gh);
861 
862         gfs2_quota_cleanup(sdp);
863 
864         return error;
865 }
866 
867 /**
868  * gfs2_put_super - Unmount the filesystem
869  * @sb: The VFS superblock
870  *
871  */
872 
873 static void gfs2_put_super(struct super_block *sb)
874 {
875         struct gfs2_sbd *sdp = sb->s_fs_info;
876         int error;
877         struct gfs2_jdesc *jd;
878 
879         /* No more recovery requests */
880         set_bit(SDF_NORECOVERY, &sdp->sd_flags);
881         smp_mb();
882 
883         /* Wait on outstanding recovery */
884 restart:
885         spin_lock(&sdp->sd_jindex_spin);
886         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
887                 if (!test_bit(JDF_RECOVERY, &jd->jd_flags))
888                         continue;
889                 spin_unlock(&sdp->sd_jindex_spin);
890                 wait_on_bit(&jd->jd_flags, JDF_RECOVERY,
891                             TASK_UNINTERRUPTIBLE);
892                 goto restart;
893         }
894         spin_unlock(&sdp->sd_jindex_spin);
895 
896         if (!(sb->s_flags & MS_RDONLY)) {
897                 error = gfs2_make_fs_ro(sdp);
898                 if (error)
899                         gfs2_io_error(sdp);
900         }
901         /*  At this point, we're through modifying the disk  */
902 
903         /*  Release stuff  */
904 
905         iput(sdp->sd_jindex);
906         iput(sdp->sd_statfs_inode);
907         iput(sdp->sd_rindex);
908         iput(sdp->sd_quota_inode);
909 
910         gfs2_glock_put(sdp->sd_rename_gl);
911         gfs2_glock_put(sdp->sd_freeze_gl);
912 
913         if (!sdp->sd_args.ar_spectator) {
914                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
915                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
916                 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
917                 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
918                 iput(sdp->sd_sc_inode);
919                 iput(sdp->sd_qc_inode);
920         }
921 
922         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
923         gfs2_clear_rgrpd(sdp);
924         gfs2_jindex_free(sdp);
925         /*  Take apart glock structures and buffer lists  */
926         gfs2_gl_hash_clear(sdp);
927         /*  Unmount the locking protocol  */
928         gfs2_lm_unmount(sdp);
929 
930         /*  At this point, we're through participating in the lockspace  */
931         gfs2_sys_fs_del(sdp);
932 }
933 
934 /**
935  * gfs2_sync_fs - sync the filesystem
936  * @sb: the superblock
937  *
938  * Flushes the log to disk.
939  */
940 
941 static int gfs2_sync_fs(struct super_block *sb, int wait)
942 {
943         struct gfs2_sbd *sdp = sb->s_fs_info;
944 
945         gfs2_quota_sync(sb, -1);
946         if (wait && sdp && !atomic_read(&sdp->sd_log_freeze))
947                 gfs2_log_flush(sdp, NULL, NORMAL_FLUSH);
948         return 0;
949 }
950 
951 /**
952  * gfs2_freeze - prevent further writes to the filesystem
953  * @sb: the VFS structure for the filesystem
954  *
955  */
956 
957 static int gfs2_freeze(struct super_block *sb)
958 {
959         struct gfs2_sbd *sdp = sb->s_fs_info;
960         int error;
961 
962         if (test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
963                 return -EINVAL;
964 
965         for (;;) {
966                 error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh);
967                 if (!error)
968                         break;
969 
970                 switch (error) {
971                 case -EBUSY:
972                         fs_err(sdp, "waiting for recovery before freeze\n");
973                         break;
974 
975                 default:
976                         fs_err(sdp, "error freezing FS: %d\n", error);
977                         break;
978                 }
979 
980                 fs_err(sdp, "retrying...\n");
981                 msleep(1000);
982         }
983         return 0;
984 }
985 
986 /**
987  * gfs2_unfreeze - reallow writes to the filesystem
988  * @sb: the VFS structure for the filesystem
989  *
990  */
991 
992 static int gfs2_unfreeze(struct super_block *sb)
993 {
994         struct gfs2_sbd *sdp = sb->s_fs_info;
995 
996         gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
997         atomic_dec(&sdp->sd_frozen_root);
998         wait_event(sdp->sd_frozen_root_wait, atomic_read(&sdp->sd_frozen_root) == 0);
999         gfs2_glock_dq_uninit(&sdp->sd_freeze_root_gh);
1000         return 0;
1001 }
1002 
1003 /**
1004  * statfs_fill - fill in the sg for a given RG
1005  * @rgd: the RG
1006  * @sc: the sc structure
1007  *
1008  * Returns: 0 on success, -ESTALE if the LVB is invalid
1009  */
1010 
1011 static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
1012                             struct gfs2_statfs_change_host *sc)
1013 {
1014         gfs2_rgrp_verify(rgd);
1015         sc->sc_total += rgd->rd_data;
1016         sc->sc_free += rgd->rd_free;
1017         sc->sc_dinodes += rgd->rd_dinodes;
1018         return 0;
1019 }
1020 
1021 /**
1022  * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
1023  * @sdp: the filesystem
1024  * @sc: the sc info that will be returned
1025  *
1026  * Any error (other than a signal) will cause this routine to fall back
1027  * to the synchronous version.
1028  *
1029  * FIXME: This really shouldn't busy wait like this.
1030  *
1031  * Returns: errno
1032  */
1033 
1034 static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
1035 {
1036         struct gfs2_rgrpd *rgd_next;
1037         struct gfs2_holder *gha, *gh;
1038         unsigned int slots = 64;
1039         unsigned int x;
1040         int done;
1041         int error = 0, err;
1042 
1043         memset(sc, 0, sizeof(struct gfs2_statfs_change_host));
1044         gha = kcalloc(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
1045         if (!gha)
1046                 return -ENOMEM;
1047 
1048         rgd_next = gfs2_rgrpd_get_first(sdp);
1049 
1050         for (;;) {
1051                 done = 1;
1052 
1053                 for (x = 0; x < slots; x++) {
1054                         gh = gha + x;
1055 
1056                         if (gh->gh_gl && gfs2_glock_poll(gh)) {
1057                                 err = gfs2_glock_wait(gh);
1058                                 if (err) {
1059                                         gfs2_holder_uninit(gh);
1060                                         error = err;
1061                                 } else {
1062                                         if (!error)
1063                                                 error = statfs_slow_fill(
1064                                                         gh->gh_gl->gl_object, sc);
1065                                         gfs2_glock_dq_uninit(gh);
1066                                 }
1067                         }
1068 
1069                         if (gh->gh_gl)
1070                                 done = 0;
1071                         else if (rgd_next && !error) {
1072                                 error = gfs2_glock_nq_init(rgd_next->rd_gl,
1073                                                            LM_ST_SHARED,
1074                                                            GL_ASYNC,
1075                                                            gh);
1076                                 rgd_next = gfs2_rgrpd_get_next(rgd_next);
1077                                 done = 0;
1078                         }
1079 
1080                         if (signal_pending(current))
1081                                 error = -ERESTARTSYS;
1082                 }
1083 
1084                 if (done)
1085                         break;
1086 
1087                 yield();
1088         }
1089 
1090         kfree(gha);
1091         return error;
1092 }
1093 
1094 /**
1095  * gfs2_statfs_i - Do a statfs
1096  * @sdp: the filesystem
1097  * @sg: the sg structure
1098  *
1099  * Returns: errno
1100  */
1101 
1102 static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
1103 {
1104         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
1105         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
1106 
1107         spin_lock(&sdp->sd_statfs_spin);
1108 
1109         *sc = *m_sc;
1110         sc->sc_total += l_sc->sc_total;
1111         sc->sc_free += l_sc->sc_free;
1112         sc->sc_dinodes += l_sc->sc_dinodes;
1113 
1114         spin_unlock(&sdp->sd_statfs_spin);
1115 
1116         if (sc->sc_free < 0)
1117                 sc->sc_free = 0;
1118         if (sc->sc_free > sc->sc_total)
1119                 sc->sc_free = sc->sc_total;
1120         if (sc->sc_dinodes < 0)
1121                 sc->sc_dinodes = 0;
1122 
1123         return 0;
1124 }
1125 
1126 /**
1127  * gfs2_statfs - Gather and return stats about the filesystem
1128  * @sb: The superblock
1129  * @statfsbuf: The buffer
1130  *
1131  * Returns: 0 on success or error code
1132  */
1133 
1134 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1135 {
1136         struct super_block *sb = dentry->d_inode->i_sb;
1137         struct gfs2_sbd *sdp = sb->s_fs_info;
1138         struct gfs2_statfs_change_host sc;
1139         int error;
1140 
1141         error = gfs2_rindex_update(sdp);
1142         if (error)
1143                 return error;
1144 
1145         if (gfs2_tune_get(sdp, gt_statfs_slow))
1146                 error = gfs2_statfs_slow(sdp, &sc);
1147         else
1148                 error = gfs2_statfs_i(sdp, &sc);
1149 
1150         if (error)
1151                 return error;
1152 
1153         buf->f_type = GFS2_MAGIC;
1154         buf->f_bsize = sdp->sd_sb.sb_bsize;
1155         buf->f_blocks = sc.sc_total;
1156         buf->f_bfree = sc.sc_free;
1157         buf->f_bavail = sc.sc_free;
1158         buf->f_files = sc.sc_dinodes + sc.sc_free;
1159         buf->f_ffree = sc.sc_free;
1160         buf->f_namelen = GFS2_FNAMESIZE;
1161 
1162         return 0;
1163 }
1164 
1165 /**
1166  * gfs2_remount_fs - called when the FS is remounted
1167  * @sb:  the filesystem
1168  * @flags:  the remount flags
1169  * @data:  extra data passed in (not used right now)
1170  *
1171  * Returns: errno
1172  */
1173 
1174 static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data)
1175 {
1176         struct gfs2_sbd *sdp = sb->s_fs_info;
1177         struct gfs2_args args = sdp->sd_args; /* Default to current settings */
1178         struct gfs2_tune *gt = &sdp->sd_tune;
1179         int error;
1180 
1181         sync_filesystem(sb);
1182 
1183         spin_lock(&gt->gt_spin);
1184         args.ar_commit = gt->gt_logd_secs;
1185         args.ar_quota_quantum = gt->gt_quota_quantum;
1186         if (gt->gt_statfs_slow)
1187                 args.ar_statfs_quantum = 0;
1188         else
1189                 args.ar_statfs_quantum = gt->gt_statfs_quantum;
1190         spin_unlock(&gt->gt_spin);
1191         error = gfs2_mount_args(&args, data);
1192         if (error)
1193                 return error;
1194 
1195         /* Not allowed to change locking details */
1196         if (strcmp(args.ar_lockproto, sdp->sd_args.ar_lockproto) ||
1197             strcmp(args.ar_locktable, sdp->sd_args.ar_locktable) ||
1198             strcmp(args.ar_hostdata, sdp->sd_args.ar_hostdata))
1199                 return -EINVAL;
1200 
1201         /* Some flags must not be changed */
1202         if (args_neq(&args, &sdp->sd_args, spectator) ||
1203             args_neq(&args, &sdp->sd_args, localflocks) ||
1204             args_neq(&args, &sdp->sd_args, meta))
1205                 return -EINVAL;
1206 
1207         if (sdp->sd_args.ar_spectator)
1208                 *flags |= MS_RDONLY;
1209 
1210         if ((sb->s_flags ^ *flags) & MS_RDONLY) {
1211                 if (*flags & MS_RDONLY)
1212                         error = gfs2_make_fs_ro(sdp);
1213                 else
1214                         error = gfs2_make_fs_rw(sdp);
1215                 if (error)
1216                         return error;
1217         }
1218 
1219         sdp->sd_args = args;
1220         if (sdp->sd_args.ar_posix_acl)
1221                 sb->s_flags |= MS_POSIXACL;
1222         else
1223                 sb->s_flags &= ~MS_POSIXACL;
1224         if (sdp->sd_args.ar_nobarrier)
1225                 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1226         else
1227                 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1228         spin_lock(&gt->gt_spin);
1229         gt->gt_logd_secs = args.ar_commit;
1230         gt->gt_quota_quantum = args.ar_quota_quantum;
1231         if (args.ar_statfs_quantum) {
1232                 gt->gt_statfs_slow = 0;
1233                 gt->gt_statfs_quantum = args.ar_statfs_quantum;
1234         }
1235         else {
1236                 gt->gt_statfs_slow = 1;
1237                 gt->gt_statfs_quantum = 30;
1238         }
1239         spin_unlock(&gt->gt_spin);
1240 
1241         gfs2_online_uevent(sdp);
1242         return 0;
1243 }
1244 
1245 /**
1246  * gfs2_drop_inode - Drop an inode (test for remote unlink)
1247  * @inode: The inode to drop
1248  *
1249  * If we've received a callback on an iopen lock then its because a
1250  * remote node tried to deallocate the inode but failed due to this node
1251  * still having the inode open. Here we mark the link count zero
1252  * since we know that it must have reached zero if the GLF_DEMOTE flag
1253  * is set on the iopen glock. If we didn't do a disk read since the
1254  * remote node removed the final link then we might otherwise miss
1255  * this event. This check ensures that this node will deallocate the
1256  * inode's blocks, or alternatively pass the baton on to another
1257  * node for later deallocation.
1258  */
1259 
1260 static int gfs2_drop_inode(struct inode *inode)
1261 {
1262         struct gfs2_inode *ip = GFS2_I(inode);
1263 
1264         if (!test_bit(GIF_FREE_VFS_INODE, &ip->i_flags) && inode->i_nlink) {
1265                 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1266                 if (gl && test_bit(GLF_DEMOTE, &gl->gl_flags))
1267                         clear_nlink(inode);
1268         }
1269         return generic_drop_inode(inode);
1270 }
1271 
1272 static int is_ancestor(const struct dentry *d1, const struct dentry *d2)
1273 {
1274         do {
1275                 if (d1 == d2)
1276                         return 1;
1277                 d1 = d1->d_parent;
1278         } while (!IS_ROOT(d1));
1279         return 0;
1280 }
1281 
1282 /**
1283  * gfs2_show_options - Show mount options for /proc/mounts
1284  * @s: seq_file structure
1285  * @root: root of this (sub)tree
1286  *
1287  * Returns: 0 on success or error code
1288  */
1289 
1290 static int gfs2_show_options(struct seq_file *s, struct dentry *root)
1291 {
1292         struct gfs2_sbd *sdp = root->d_sb->s_fs_info;
1293         struct gfs2_args *args = &sdp->sd_args;
1294         int val;
1295 
1296         if (is_ancestor(root, sdp->sd_master_dir))
1297                 seq_puts(s, ",meta");
1298         if (args->ar_lockproto[0])
1299                 seq_printf(s, ",lockproto=%s", args->ar_lockproto);
1300         if (args->ar_locktable[0])
1301                 seq_printf(s, ",locktable=%s", args->ar_locktable);
1302         if (args->ar_hostdata[0])
1303                 seq_printf(s, ",hostdata=%s", args->ar_hostdata);
1304         if (args->ar_spectator)
1305                 seq_puts(s, ",spectator");
1306         if (args->ar_localflocks)
1307                 seq_puts(s, ",localflocks");
1308         if (args->ar_debug)
1309                 seq_puts(s, ",debug");
1310         if (args->ar_posix_acl)
1311                 seq_puts(s, ",acl");
1312         if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
1313                 char *state;
1314                 switch (args->ar_quota) {
1315                 case GFS2_QUOTA_OFF:
1316                         state = "off";
1317                         break;
1318                 case GFS2_QUOTA_ACCOUNT:
1319                         state = "account";
1320                         break;
1321                 case GFS2_QUOTA_ON:
1322                         state = "on";
1323                         break;
1324                 default:
1325                         state = "unknown";
1326                         break;
1327                 }
1328                 seq_printf(s, ",quota=%s", state);
1329         }
1330         if (args->ar_suiddir)
1331                 seq_puts(s, ",suiddir");
1332         if (args->ar_data != GFS2_DATA_DEFAULT) {
1333                 char *state;
1334                 switch (args->ar_data) {
1335                 case GFS2_DATA_WRITEBACK:
1336                         state = "writeback";
1337                         break;
1338                 case GFS2_DATA_ORDERED:
1339                         state = "ordered";
1340                         break;
1341                 default:
1342                         state = "unknown";
1343                         break;
1344                 }
1345                 seq_printf(s, ",data=%s", state);
1346         }
1347         if (args->ar_discard)
1348                 seq_puts(s, ",discard");
1349         val = sdp->sd_tune.gt_logd_secs;
1350         if (val != 30)
1351                 seq_printf(s, ",commit=%d", val);
1352         val = sdp->sd_tune.gt_statfs_quantum;
1353         if (val != 30)
1354                 seq_printf(s, ",statfs_quantum=%d", val);
1355         else if (sdp->sd_tune.gt_statfs_slow)
1356                 seq_puts(s, ",statfs_quantum=0");
1357         val = sdp->sd_tune.gt_quota_quantum;
1358         if (val != 60)
1359                 seq_printf(s, ",quota_quantum=%d", val);
1360         if (args->ar_statfs_percent)
1361                 seq_printf(s, ",statfs_percent=%d", args->ar_statfs_percent);
1362         if (args->ar_errors != GFS2_ERRORS_DEFAULT) {
1363                 const char *state;
1364 
1365                 switch (args->ar_errors) {
1366                 case GFS2_ERRORS_WITHDRAW:
1367                         state = "withdraw";
1368                         break;
1369                 case GFS2_ERRORS_PANIC:
1370                         state = "panic";
1371                         break;
1372                 default:
1373                         state = "unknown";
1374                         break;
1375                 }
1376                 seq_printf(s, ",errors=%s", state);
1377         }
1378         if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags))
1379                 seq_puts(s, ",nobarrier");
1380         if (test_bit(SDF_DEMOTE, &sdp->sd_flags))
1381                 seq_puts(s, ",demote_interface_used");
1382         if (args->ar_rgrplvb)
1383                 seq_puts(s, ",rgrplvb");
1384         return 0;
1385 }
1386 
1387 static void gfs2_final_release_pages(struct gfs2_inode *ip)
1388 {
1389         struct inode *inode = &ip->i_inode;
1390         struct gfs2_glock *gl = ip->i_gl;
1391 
1392         truncate_inode_pages(gfs2_glock2aspace(ip->i_gl), 0);
1393         truncate_inode_pages(&inode->i_data, 0);
1394 
1395         if (atomic_read(&gl->gl_revokes) == 0) {
1396                 clear_bit(GLF_LFLUSH, &gl->gl_flags);
1397                 clear_bit(GLF_DIRTY, &gl->gl_flags);
1398         }
1399 }
1400 
1401 static int gfs2_dinode_dealloc(struct gfs2_inode *ip)
1402 {
1403         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1404         struct gfs2_rgrpd *rgd;
1405         struct gfs2_holder gh;
1406         int error;
1407 
1408         if (gfs2_get_inode_blocks(&ip->i_inode) != 1) {
1409                 gfs2_consist_inode(ip);
1410                 return -EIO;
1411         }
1412 
1413         error = gfs2_rindex_update(sdp);
1414         if (error)
1415                 return error;
1416 
1417         error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
1418         if (error)
1419                 return error;
1420 
1421         rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1422         if (!rgd) {
1423                 gfs2_consist_inode(ip);
1424                 error = -EIO;
1425                 goto out_qs;
1426         }
1427 
1428         error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
1429         if (error)
1430                 goto out_qs;
1431 
1432         error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA,
1433                                  sdp->sd_jdesc->jd_blocks);
1434         if (error)
1435                 goto out_rg_gunlock;
1436 
1437         gfs2_free_di(rgd, ip);
1438 
1439         gfs2_final_release_pages(ip);
1440 
1441         gfs2_trans_end(sdp);
1442 
1443 out_rg_gunlock:
1444         gfs2_glock_dq_uninit(&gh);
1445 out_qs:
1446         gfs2_quota_unhold(ip);
1447         return error;
1448 }
1449 
1450 /**
1451  * gfs2_evict_inode - Remove an inode from cache
1452  * @inode: The inode to evict
1453  *
1454  * There are three cases to consider:
1455  * 1. i_nlink == 0, we are final opener (and must deallocate)
1456  * 2. i_nlink == 0, we are not the final opener (and cannot deallocate)
1457  * 3. i_nlink > 0
1458  *
1459  * If the fs is read only, then we have to treat all cases as per #3
1460  * since we are unable to do any deallocation. The inode will be
1461  * deallocated by the next read/write node to attempt an allocation
1462  * in the same resource group
1463  *
1464  * We have to (at the moment) hold the inodes main lock to cover
1465  * the gap between unlocking the shared lock on the iopen lock and
1466  * taking the exclusive lock. I'd rather do a shared -> exclusive
1467  * conversion on the iopen lock, but we can change that later. This
1468  * is safe, just less efficient.
1469  */
1470 
1471 static void gfs2_evict_inode(struct inode *inode)
1472 {
1473         struct super_block *sb = inode->i_sb;
1474         struct gfs2_sbd *sdp = sb->s_fs_info;
1475         struct gfs2_inode *ip = GFS2_I(inode);
1476         struct gfs2_holder gh;
1477         int error;
1478 
1479         if (test_bit(GIF_FREE_VFS_INODE, &ip->i_flags)) {
1480                 clear_inode(inode);
1481                 return;
1482         }
1483 
1484         if (inode->i_nlink || (sb->s_flags & MS_RDONLY))
1485                 goto out;
1486 
1487         /* Must not read inode block until block type has been verified */
1488         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh);
1489         if (unlikely(error)) {
1490                 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1491                 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1492                 goto out;
1493         }
1494 
1495         if (!test_bit(GIF_ALLOC_FAILED, &ip->i_flags)) {
1496                 error = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED);
1497                 if (error)
1498                         goto out_truncate;
1499         }
1500 
1501         if (test_bit(GIF_INVALID, &ip->i_flags)) {
1502                 error = gfs2_inode_refresh(ip);
1503                 if (error)
1504                         goto out_truncate;
1505         }
1506 
1507         ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1508         gfs2_glock_dq_wait(&ip->i_iopen_gh);
1509         gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, &ip->i_iopen_gh);
1510         error = gfs2_glock_nq(&ip->i_iopen_gh);
1511         if (error)
1512                 goto out_truncate;
1513 
1514         /* Case 1 starts here */
1515 
1516         if (S_ISDIR(inode->i_mode) &&
1517             (ip->i_diskflags & GFS2_DIF_EXHASH)) {
1518                 error = gfs2_dir_exhash_dealloc(ip);
1519                 if (error)
1520                         goto out_unlock;
1521         }
1522 
1523         if (ip->i_eattr) {
1524                 error = gfs2_ea_dealloc(ip);
1525                 if (error)
1526                         goto out_unlock;
1527         }
1528 
1529         if (!gfs2_is_stuffed(ip)) {
1530                 error = gfs2_file_dealloc(ip);
1531                 if (error)
1532                         goto out_unlock;
1533         }
1534 
1535         error = gfs2_dinode_dealloc(ip);
1536         goto out_unlock;
1537 
1538 out_truncate:
1539         gfs2_log_flush(sdp, ip->i_gl, NORMAL_FLUSH);
1540         if (test_bit(GLF_DIRTY, &ip->i_gl->gl_flags)) {
1541                 struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl);
1542                 filemap_fdatawrite(metamapping);
1543                 filemap_fdatawait(metamapping);
1544         }
1545         write_inode_now(inode, 1);
1546         gfs2_ail_flush(ip->i_gl, 0);
1547 
1548         /* Case 2 starts here */
1549         error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
1550         if (error)
1551                 goto out_unlock;
1552         /* Needs to be done before glock release & also in a transaction */
1553         truncate_inode_pages(&inode->i_data, 0);
1554         gfs2_trans_end(sdp);
1555 
1556 out_unlock:
1557         /* Error path for case 1 */
1558         if (gfs2_rs_active(ip->i_res))
1559                 gfs2_rs_deltree(ip->i_res);
1560 
1561         if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) {
1562                 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1563                 gfs2_glock_dq(&ip->i_iopen_gh);
1564         }
1565         gfs2_holder_uninit(&ip->i_iopen_gh);
1566         gfs2_glock_dq_uninit(&gh);
1567         if (error && error != GLR_TRYFAILED && error != -EROFS)
1568                 fs_warn(sdp, "gfs2_evict_inode: %d\n", error);
1569 out:
1570         /* Case 3 starts here */
1571         truncate_inode_pages_final(&inode->i_data);
1572         gfs2_rs_delete(ip, NULL);
1573         gfs2_ordered_del_inode(ip);
1574         clear_inode(inode);
1575         gfs2_dir_hash_inval(ip);
1576         ip->i_gl->gl_object = NULL;
1577         flush_delayed_work(&ip->i_gl->gl_work);
1578         gfs2_glock_add_to_lru(ip->i_gl);
1579         gfs2_glock_put(ip->i_gl);
1580         ip->i_gl = NULL;
1581         if (ip->i_iopen_gh.gh_gl) {
1582                 ip->i_iopen_gh.gh_gl->gl_object = NULL;
1583                 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1584                 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1585         }
1586 }
1587 
1588 static struct inode *gfs2_alloc_inode(struct super_block *sb)
1589 {
1590         struct gfs2_inode *ip;
1591 
1592         ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
1593         if (ip) {
1594                 ip->i_flags = 0;
1595                 ip->i_gl = NULL;
1596                 ip->i_rgd = NULL;
1597                 ip->i_res = NULL;
1598         }
1599         return &ip->i_inode;
1600 }
1601 
1602 static void gfs2_i_callback(struct rcu_head *head)
1603 {
1604         struct inode *inode = container_of(head, struct inode, i_rcu);
1605         kmem_cache_free(gfs2_inode_cachep, inode);
1606 }
1607 
1608 static void gfs2_destroy_inode(struct inode *inode)
1609 {
1610         call_rcu(&inode->i_rcu, gfs2_i_callback);
1611 }
1612 
1613 const struct super_operations gfs2_super_ops = {
1614         .alloc_inode            = gfs2_alloc_inode,
1615         .destroy_inode          = gfs2_destroy_inode,
1616         .write_inode            = gfs2_write_inode,
1617         .dirty_inode            = gfs2_dirty_inode,
1618         .evict_inode            = gfs2_evict_inode,
1619         .put_super              = gfs2_put_super,
1620         .sync_fs                = gfs2_sync_fs,
1621         .freeze_fs              = gfs2_freeze,
1622         .unfreeze_fs            = gfs2_unfreeze,
1623         .statfs                 = gfs2_statfs,
1624         .remount_fs             = gfs2_remount_fs,
1625         .drop_inode             = gfs2_drop_inode,
1626         .show_options           = gfs2_show_options,
1627 };
1628 
1629 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp