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

Version: ~ [ linux-5.0-rc6 ] ~ [ linux-4.20.10 ] ~ [ linux-4.19.23 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.101 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.158 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.174 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.134 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.63 ] ~ [ 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-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ 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/signal.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 #include <linux/kernel.h>
 30 
 31 #include "gfs2.h"
 32 #include "incore.h"
 33 #include "bmap.h"
 34 #include "dir.h"
 35 #include "glock.h"
 36 #include "glops.h"
 37 #include "inode.h"
 38 #include "log.h"
 39 #include "meta_io.h"
 40 #include "quota.h"
 41 #include "recovery.h"
 42 #include "rgrp.h"
 43 #include "super.h"
 44 #include "trans.h"
 45 #include "util.h"
 46 #include "sys.h"
 47 #include "xattr.h"
 48 #include "lops.h"
 49 
 50 #define args_neq(a1, a2, x) ((a1)->ar_##x != (a2)->ar_##x)
 51 
 52 enum {
 53         Opt_lockproto,
 54         Opt_locktable,
 55         Opt_hostdata,
 56         Opt_spectator,
 57         Opt_ignore_local_fs,
 58         Opt_localflocks,
 59         Opt_localcaching,
 60         Opt_debug,
 61         Opt_nodebug,
 62         Opt_upgrade,
 63         Opt_acl,
 64         Opt_noacl,
 65         Opt_quota_off,
 66         Opt_quota_account,
 67         Opt_quota_on,
 68         Opt_quota,
 69         Opt_noquota,
 70         Opt_suiddir,
 71         Opt_nosuiddir,
 72         Opt_data_writeback,
 73         Opt_data_ordered,
 74         Opt_meta,
 75         Opt_discard,
 76         Opt_nodiscard,
 77         Opt_commit,
 78         Opt_err_withdraw,
 79         Opt_err_panic,
 80         Opt_statfs_quantum,
 81         Opt_statfs_percent,
 82         Opt_quota_quantum,
 83         Opt_barrier,
 84         Opt_nobarrier,
 85         Opt_rgrplvb,
 86         Opt_norgrplvb,
 87         Opt_loccookie,
 88         Opt_noloccookie,
 89         Opt_error,
 90 };
 91 
 92 static const match_table_t tokens = {
 93         {Opt_lockproto, "lockproto=%s"},
 94         {Opt_locktable, "locktable=%s"},
 95         {Opt_hostdata, "hostdata=%s"},
 96         {Opt_spectator, "spectator"},
 97         {Opt_spectator, "norecovery"},
 98         {Opt_ignore_local_fs, "ignore_local_fs"},
 99         {Opt_localflocks, "localflocks"},
100         {Opt_localcaching, "localcaching"},
101         {Opt_debug, "debug"},
102         {Opt_nodebug, "nodebug"},
103         {Opt_upgrade, "upgrade"},
104         {Opt_acl, "acl"},
105         {Opt_noacl, "noacl"},
106         {Opt_quota_off, "quota=off"},
107         {Opt_quota_account, "quota=account"},
108         {Opt_quota_on, "quota=on"},
109         {Opt_quota, "quota"},
110         {Opt_noquota, "noquota"},
111         {Opt_suiddir, "suiddir"},
112         {Opt_nosuiddir, "nosuiddir"},
113         {Opt_data_writeback, "data=writeback"},
114         {Opt_data_ordered, "data=ordered"},
115         {Opt_meta, "meta"},
116         {Opt_discard, "discard"},
117         {Opt_nodiscard, "nodiscard"},
118         {Opt_commit, "commit=%d"},
119         {Opt_err_withdraw, "errors=withdraw"},
120         {Opt_err_panic, "errors=panic"},
121         {Opt_statfs_quantum, "statfs_quantum=%d"},
122         {Opt_statfs_percent, "statfs_percent=%d"},
123         {Opt_quota_quantum, "quota_quantum=%d"},
124         {Opt_barrier, "barrier"},
125         {Opt_nobarrier, "nobarrier"},
126         {Opt_rgrplvb, "rgrplvb"},
127         {Opt_norgrplvb, "norgrplvb"},
128         {Opt_loccookie, "loccookie"},
129         {Opt_noloccookie, "noloccookie"},
130         {Opt_error, NULL}
131 };
132 
133 /**
134  * gfs2_mount_args - Parse mount options
135  * @args: The structure into which the parsed options will be written
136  * @options: The options to parse
137  *
138  * Return: errno
139  */
140 
141 int gfs2_mount_args(struct gfs2_args *args, char *options)
142 {
143         char *o;
144         int token;
145         substring_t tmp[MAX_OPT_ARGS];
146         int rv;
147 
148         /* Split the options into tokens with the "," character and
149            process them */
150 
151         while (1) {
152                 o = strsep(&options, ",");
153                 if (o == NULL)
154                         break;
155                 if (*o == '\0')
156                         continue;
157 
158                 token = match_token(o, tokens, tmp);
159                 switch (token) {
160                 case Opt_lockproto:
161                         match_strlcpy(args->ar_lockproto, &tmp[0],
162                                       GFS2_LOCKNAME_LEN);
163                         break;
164                 case Opt_locktable:
165                         match_strlcpy(args->ar_locktable, &tmp[0],
166                                       GFS2_LOCKNAME_LEN);
167                         break;
168                 case Opt_hostdata:
169                         match_strlcpy(args->ar_hostdata, &tmp[0],
170                                       GFS2_LOCKNAME_LEN);
171                         break;
172                 case Opt_spectator:
173                         args->ar_spectator = 1;
174                         break;
175                 case Opt_ignore_local_fs:
176                         /* Retained for backwards compat only */
177                         break;
178                 case Opt_localflocks:
179                         args->ar_localflocks = 1;
180                         break;
181                 case Opt_localcaching:
182                         /* Retained for backwards compat only */
183                         break;
184                 case Opt_debug:
185                         if (args->ar_errors == GFS2_ERRORS_PANIC) {
186                                 pr_warn("-o debug and -o errors=panic are mutually exclusive\n");
187                                 return -EINVAL;
188                         }
189                         args->ar_debug = 1;
190                         break;
191                 case Opt_nodebug:
192                         args->ar_debug = 0;
193                         break;
194                 case Opt_upgrade:
195                         /* Retained for backwards compat only */
196                         break;
197                 case Opt_acl:
198                         args->ar_posix_acl = 1;
199                         break;
200                 case Opt_noacl:
201                         args->ar_posix_acl = 0;
202                         break;
203                 case Opt_quota_off:
204                 case Opt_noquota:
205                         args->ar_quota = GFS2_QUOTA_OFF;
206                         break;
207                 case Opt_quota_account:
208                         args->ar_quota = GFS2_QUOTA_ACCOUNT;
209                         break;
210                 case Opt_quota_on:
211                 case Opt_quota:
212                         args->ar_quota = GFS2_QUOTA_ON;
213                         break;
214                 case Opt_suiddir:
215                         args->ar_suiddir = 1;
216                         break;
217                 case Opt_nosuiddir:
218                         args->ar_suiddir = 0;
219                         break;
220                 case Opt_data_writeback:
221                         args->ar_data = GFS2_DATA_WRITEBACK;
222                         break;
223                 case Opt_data_ordered:
224                         args->ar_data = GFS2_DATA_ORDERED;
225                         break;
226                 case Opt_meta:
227                         args->ar_meta = 1;
228                         break;
229                 case Opt_discard:
230                         args->ar_discard = 1;
231                         break;
232                 case Opt_nodiscard:
233                         args->ar_discard = 0;
234                         break;
235                 case Opt_commit:
236                         rv = match_int(&tmp[0], &args->ar_commit);
237                         if (rv || args->ar_commit <= 0) {
238                                 pr_warn("commit mount option requires a positive numeric argument\n");
239                                 return rv ? rv : -EINVAL;
240                         }
241                         break;
242                 case Opt_statfs_quantum:
243                         rv = match_int(&tmp[0], &args->ar_statfs_quantum);
244                         if (rv || args->ar_statfs_quantum < 0) {
245                                 pr_warn("statfs_quantum mount option requires a non-negative numeric argument\n");
246                                 return rv ? rv : -EINVAL;
247                         }
248                         break;
249                 case Opt_quota_quantum:
250                         rv = match_int(&tmp[0], &args->ar_quota_quantum);
251                         if (rv || args->ar_quota_quantum <= 0) {
252                                 pr_warn("quota_quantum mount option requires a positive numeric argument\n");
253                                 return rv ? rv : -EINVAL;
254                         }
255                         break;
256                 case Opt_statfs_percent:
257                         rv = match_int(&tmp[0], &args->ar_statfs_percent);
258                         if (rv || args->ar_statfs_percent < 0 ||
259                             args->ar_statfs_percent > 100) {
260                                 pr_warn("statfs_percent mount option requires a numeric argument between 0 and 100\n");
261                                 return rv ? rv : -EINVAL;
262                         }
263                         break;
264                 case Opt_err_withdraw:
265                         args->ar_errors = GFS2_ERRORS_WITHDRAW;
266                         break;
267                 case Opt_err_panic:
268                         if (args->ar_debug) {
269                                 pr_warn("-o debug and -o errors=panic are mutually exclusive\n");
270                                 return -EINVAL;
271                         }
272                         args->ar_errors = GFS2_ERRORS_PANIC;
273                         break;
274                 case Opt_barrier:
275                         args->ar_nobarrier = 0;
276                         break;
277                 case Opt_nobarrier:
278                         args->ar_nobarrier = 1;
279                         break;
280                 case Opt_rgrplvb:
281                         args->ar_rgrplvb = 1;
282                         break;
283                 case Opt_norgrplvb:
284                         args->ar_rgrplvb = 0;
285                         break;
286                 case Opt_loccookie:
287                         args->ar_loccookie = 1;
288                         break;
289                 case Opt_noloccookie:
290                         args->ar_loccookie = 0;
291                         break;
292                 case Opt_error:
293                 default:
294                         pr_warn("invalid mount option: %s\n", o);
295                         return -EINVAL;
296                 }
297         }
298 
299         return 0;
300 }
301 
302 /**
303  * gfs2_jindex_free - Clear all the journal index information
304  * @sdp: The GFS2 superblock
305  *
306  */
307 
308 void gfs2_jindex_free(struct gfs2_sbd *sdp)
309 {
310         struct list_head list;
311         struct gfs2_jdesc *jd;
312 
313         spin_lock(&sdp->sd_jindex_spin);
314         list_add(&list, &sdp->sd_jindex_list);
315         list_del_init(&sdp->sd_jindex_list);
316         sdp->sd_journals = 0;
317         spin_unlock(&sdp->sd_jindex_spin);
318 
319         while (!list_empty(&list)) {
320                 jd = list_entry(list.next, struct gfs2_jdesc, jd_list);
321                 gfs2_free_journal_extents(jd);
322                 list_del(&jd->jd_list);
323                 iput(jd->jd_inode);
324                 kfree(jd);
325         }
326 }
327 
328 static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid)
329 {
330         struct gfs2_jdesc *jd;
331         int found = 0;
332 
333         list_for_each_entry(jd, head, jd_list) {
334                 if (jd->jd_jid == jid) {
335                         found = 1;
336                         break;
337                 }
338         }
339 
340         if (!found)
341                 jd = NULL;
342 
343         return jd;
344 }
345 
346 struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid)
347 {
348         struct gfs2_jdesc *jd;
349 
350         spin_lock(&sdp->sd_jindex_spin);
351         jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
352         spin_unlock(&sdp->sd_jindex_spin);
353 
354         return jd;
355 }
356 
357 int gfs2_jdesc_check(struct gfs2_jdesc *jd)
358 {
359         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
360         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
361         u64 size = i_size_read(jd->jd_inode);
362 
363         if (gfs2_check_internal_file_size(jd->jd_inode, 8 << 20, BIT(30)))
364                 return -EIO;
365 
366         jd->jd_blocks = size >> sdp->sd_sb.sb_bsize_shift;
367 
368         if (gfs2_write_alloc_required(ip, 0, size)) {
369                 gfs2_consist_inode(ip);
370                 return -EIO;
371         }
372 
373         return 0;
374 }
375 
376 static int init_threads(struct gfs2_sbd *sdp)
377 {
378         struct task_struct *p;
379         int error = 0;
380 
381         p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
382         if (IS_ERR(p)) {
383                 error = PTR_ERR(p);
384                 fs_err(sdp, "can't start logd thread: %d\n", error);
385                 return error;
386         }
387         sdp->sd_logd_process = p;
388 
389         p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
390         if (IS_ERR(p)) {
391                 error = PTR_ERR(p);
392                 fs_err(sdp, "can't start quotad thread: %d\n", error);
393                 goto fail;
394         }
395         sdp->sd_quotad_process = p;
396         return 0;
397 
398 fail:
399         kthread_stop(sdp->sd_logd_process);
400         return error;
401 }
402 
403 /**
404  * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
405  * @sdp: the filesystem
406  *
407  * Returns: errno
408  */
409 
410 int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
411 {
412         struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
413         struct gfs2_glock *j_gl = ip->i_gl;
414         struct gfs2_holder freeze_gh;
415         struct gfs2_log_header_host head;
416         int error;
417 
418         error = init_threads(sdp);
419         if (error)
420                 return error;
421 
422         error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, 0,
423                                    &freeze_gh);
424         if (error)
425                 goto fail_threads;
426 
427         j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
428 
429         error = gfs2_find_jhead(sdp->sd_jdesc, &head);
430         if (error)
431                 goto fail;
432 
433         if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
434                 gfs2_consist(sdp);
435                 error = -EIO;
436                 goto fail;
437         }
438 
439         /*  Initialize some head of the log stuff  */
440         sdp->sd_log_sequence = head.lh_sequence + 1;
441         gfs2_log_pointers_init(sdp, head.lh_blkno);
442 
443         error = gfs2_quota_init(sdp);
444         if (error)
445                 goto fail;
446 
447         set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
448 
449         gfs2_glock_dq_uninit(&freeze_gh);
450 
451         return 0;
452 
453 fail:
454         freeze_gh.gh_flags |= GL_NOCACHE;
455         gfs2_glock_dq_uninit(&freeze_gh);
456 fail_threads:
457         kthread_stop(sdp->sd_quotad_process);
458         kthread_stop(sdp->sd_logd_process);
459         return error;
460 }
461 
462 void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf)
463 {
464         const struct gfs2_statfs_change *str = buf;
465 
466         sc->sc_total = be64_to_cpu(str->sc_total);
467         sc->sc_free = be64_to_cpu(str->sc_free);
468         sc->sc_dinodes = be64_to_cpu(str->sc_dinodes);
469 }
470 
471 static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf)
472 {
473         struct gfs2_statfs_change *str = buf;
474 
475         str->sc_total = cpu_to_be64(sc->sc_total);
476         str->sc_free = cpu_to_be64(sc->sc_free);
477         str->sc_dinodes = cpu_to_be64(sc->sc_dinodes);
478 }
479 
480 int gfs2_statfs_init(struct gfs2_sbd *sdp)
481 {
482         struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
483         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
484         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
485         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
486         struct buffer_head *m_bh, *l_bh;
487         struct gfs2_holder gh;
488         int error;
489 
490         error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
491                                    &gh);
492         if (error)
493                 return error;
494 
495         error = gfs2_meta_inode_buffer(m_ip, &m_bh);
496         if (error)
497                 goto out;
498 
499         if (sdp->sd_args.ar_spectator) {
500                 spin_lock(&sdp->sd_statfs_spin);
501                 gfs2_statfs_change_in(m_sc, m_bh->b_data +
502                                       sizeof(struct gfs2_dinode));
503                 spin_unlock(&sdp->sd_statfs_spin);
504         } else {
505                 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
506                 if (error)
507                         goto out_m_bh;
508 
509                 spin_lock(&sdp->sd_statfs_spin);
510                 gfs2_statfs_change_in(m_sc, m_bh->b_data +
511                                       sizeof(struct gfs2_dinode));
512                 gfs2_statfs_change_in(l_sc, l_bh->b_data +
513                                       sizeof(struct gfs2_dinode));
514                 spin_unlock(&sdp->sd_statfs_spin);
515 
516                 brelse(l_bh);
517         }
518 
519 out_m_bh:
520         brelse(m_bh);
521 out:
522         gfs2_glock_dq_uninit(&gh);
523         return 0;
524 }
525 
526 void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free,
527                         s64 dinodes)
528 {
529         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
530         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
531         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
532         struct buffer_head *l_bh;
533         s64 x, y;
534         int need_sync = 0;
535         int error;
536 
537         error = gfs2_meta_inode_buffer(l_ip, &l_bh);
538         if (error)
539                 return;
540 
541         gfs2_trans_add_meta(l_ip->i_gl, l_bh);
542 
543         spin_lock(&sdp->sd_statfs_spin);
544         l_sc->sc_total += total;
545         l_sc->sc_free += free;
546         l_sc->sc_dinodes += dinodes;
547         gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode));
548         if (sdp->sd_args.ar_statfs_percent) {
549                 x = 100 * l_sc->sc_free;
550                 y = m_sc->sc_free * sdp->sd_args.ar_statfs_percent;
551                 if (x >= y || x <= -y)
552                         need_sync = 1;
553         }
554         spin_unlock(&sdp->sd_statfs_spin);
555 
556         brelse(l_bh);
557         if (need_sync)
558                 gfs2_wake_up_statfs(sdp);
559 }
560 
561 void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh,
562                    struct buffer_head *l_bh)
563 {
564         struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
565         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
566         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
567         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
568 
569         gfs2_trans_add_meta(l_ip->i_gl, l_bh);
570         gfs2_trans_add_meta(m_ip->i_gl, m_bh);
571 
572         spin_lock(&sdp->sd_statfs_spin);
573         m_sc->sc_total += l_sc->sc_total;
574         m_sc->sc_free += l_sc->sc_free;
575         m_sc->sc_dinodes += l_sc->sc_dinodes;
576         memset(l_sc, 0, sizeof(struct gfs2_statfs_change));
577         memset(l_bh->b_data + sizeof(struct gfs2_dinode),
578                0, sizeof(struct gfs2_statfs_change));
579         gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
580         spin_unlock(&sdp->sd_statfs_spin);
581 }
582 
583 int gfs2_statfs_sync(struct super_block *sb, int type)
584 {
585         struct gfs2_sbd *sdp = sb->s_fs_info;
586         struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
587         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
588         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
589         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
590         struct gfs2_holder gh;
591         struct buffer_head *m_bh, *l_bh;
592         int error;
593 
594         sb_start_write(sb);
595         error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
596                                    &gh);
597         if (error)
598                 goto out;
599 
600         error = gfs2_meta_inode_buffer(m_ip, &m_bh);
601         if (error)
602                 goto out_unlock;
603 
604         spin_lock(&sdp->sd_statfs_spin);
605         gfs2_statfs_change_in(m_sc, m_bh->b_data +
606                               sizeof(struct gfs2_dinode));
607         if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) {
608                 spin_unlock(&sdp->sd_statfs_spin);
609                 goto out_bh;
610         }
611         spin_unlock(&sdp->sd_statfs_spin);
612 
613         error = gfs2_meta_inode_buffer(l_ip, &l_bh);
614         if (error)
615                 goto out_bh;
616 
617         error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
618         if (error)
619                 goto out_bh2;
620 
621         update_statfs(sdp, m_bh, l_bh);
622         sdp->sd_statfs_force_sync = 0;
623 
624         gfs2_trans_end(sdp);
625 
626 out_bh2:
627         brelse(l_bh);
628 out_bh:
629         brelse(m_bh);
630 out_unlock:
631         gfs2_glock_dq_uninit(&gh);
632 out:
633         sb_end_write(sb);
634         return error;
635 }
636 
637 struct lfcc {
638         struct list_head list;
639         struct gfs2_holder gh;
640 };
641 
642 /**
643  * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
644  *                            journals are clean
645  * @sdp: the file system
646  * @state: the state to put the transaction lock into
647  * @t_gh: the hold on the transaction lock
648  *
649  * Returns: errno
650  */
651 
652 static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp,
653                                     struct gfs2_holder *freeze_gh)
654 {
655         struct gfs2_inode *ip;
656         struct gfs2_jdesc *jd;
657         struct lfcc *lfcc;
658         LIST_HEAD(list);
659         struct gfs2_log_header_host lh;
660         int error;
661 
662         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
663                 lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
664                 if (!lfcc) {
665                         error = -ENOMEM;
666                         goto out;
667                 }
668                 ip = GFS2_I(jd->jd_inode);
669                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh);
670                 if (error) {
671                         kfree(lfcc);
672                         goto out;
673                 }
674                 list_add(&lfcc->list, &list);
675         }
676 
677         error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_EXCLUSIVE,
678                                    GL_NOCACHE, freeze_gh);
679 
680         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
681                 error = gfs2_jdesc_check(jd);
682                 if (error)
683                         break;
684                 error = gfs2_find_jhead(jd, &lh);
685                 if (error)
686                         break;
687                 if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
688                         error = -EBUSY;
689                         break;
690                 }
691         }
692 
693         if (error)
694                 gfs2_glock_dq_uninit(freeze_gh);
695 
696 out:
697         while (!list_empty(&list)) {
698                 lfcc = list_entry(list.next, struct lfcc, list);
699                 list_del(&lfcc->list);
700                 gfs2_glock_dq_uninit(&lfcc->gh);
701                 kfree(lfcc);
702         }
703         return error;
704 }
705 
706 void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf)
707 {
708         struct gfs2_dinode *str = buf;
709 
710         str->di_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
711         str->di_header.mh_type = cpu_to_be32(GFS2_METATYPE_DI);
712         str->di_header.mh_format = cpu_to_be32(GFS2_FORMAT_DI);
713         str->di_num.no_addr = cpu_to_be64(ip->i_no_addr);
714         str->di_num.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino);
715         str->di_mode = cpu_to_be32(ip->i_inode.i_mode);
716         str->di_uid = cpu_to_be32(i_uid_read(&ip->i_inode));
717         str->di_gid = cpu_to_be32(i_gid_read(&ip->i_inode));
718         str->di_nlink = cpu_to_be32(ip->i_inode.i_nlink);
719         str->di_size = cpu_to_be64(i_size_read(&ip->i_inode));
720         str->di_blocks = cpu_to_be64(gfs2_get_inode_blocks(&ip->i_inode));
721         str->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec);
722         str->di_mtime = cpu_to_be64(ip->i_inode.i_mtime.tv_sec);
723         str->di_ctime = cpu_to_be64(ip->i_inode.i_ctime.tv_sec);
724 
725         str->di_goal_meta = cpu_to_be64(ip->i_goal);
726         str->di_goal_data = cpu_to_be64(ip->i_goal);
727         str->di_generation = cpu_to_be64(ip->i_generation);
728 
729         str->di_flags = cpu_to_be32(ip->i_diskflags);
730         str->di_height = cpu_to_be16(ip->i_height);
731         str->di_payload_format = cpu_to_be32(S_ISDIR(ip->i_inode.i_mode) &&
732                                              !(ip->i_diskflags & GFS2_DIF_EXHASH) ?
733                                              GFS2_FORMAT_DE : 0);
734         str->di_depth = cpu_to_be16(ip->i_depth);
735         str->di_entries = cpu_to_be32(ip->i_entries);
736 
737         str->di_eattr = cpu_to_be64(ip->i_eattr);
738         str->di_atime_nsec = cpu_to_be32(ip->i_inode.i_atime.tv_nsec);
739         str->di_mtime_nsec = cpu_to_be32(ip->i_inode.i_mtime.tv_nsec);
740         str->di_ctime_nsec = cpu_to_be32(ip->i_inode.i_ctime.tv_nsec);
741 }
742 
743 /**
744  * gfs2_write_inode - Make sure the inode is stable on the disk
745  * @inode: The inode
746  * @wbc: The writeback control structure
747  *
748  * Returns: errno
749  */
750 
751 static int gfs2_write_inode(struct inode *inode, struct writeback_control *wbc)
752 {
753         struct gfs2_inode *ip = GFS2_I(inode);
754         struct gfs2_sbd *sdp = GFS2_SB(inode);
755         struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl);
756         struct backing_dev_info *bdi = inode_to_bdi(metamapping->host);
757         int ret = 0;
758         bool flush_all = (wbc->sync_mode == WB_SYNC_ALL || gfs2_is_jdata(ip));
759 
760         if (flush_all)
761                 gfs2_log_flush(GFS2_SB(inode), ip->i_gl,
762                                GFS2_LOG_HEAD_FLUSH_NORMAL |
763                                GFS2_LFC_WRITE_INODE);
764         if (bdi->wb.dirty_exceeded)
765                 gfs2_ail1_flush(sdp, wbc);
766         else
767                 filemap_fdatawrite(metamapping);
768         if (flush_all)
769                 ret = filemap_fdatawait(metamapping);
770         if (ret)
771                 mark_inode_dirty_sync(inode);
772         else {
773                 spin_lock(&inode->i_lock);
774                 if (!(inode->i_flags & I_DIRTY))
775                         gfs2_ordered_del_inode(ip);
776                 spin_unlock(&inode->i_lock);
777         }
778         return ret;
779 }
780 
781 /**
782  * gfs2_dirty_inode - check for atime updates
783  * @inode: The inode in question
784  * @flags: The type of dirty
785  *
786  * Unfortunately it can be called under any combination of inode
787  * glock and transaction lock, so we have to check carefully.
788  *
789  * At the moment this deals only with atime - it should be possible
790  * to expand that role in future, once a review of the locking has
791  * been carried out.
792  */
793 
794 static void gfs2_dirty_inode(struct inode *inode, int flags)
795 {
796         struct gfs2_inode *ip = GFS2_I(inode);
797         struct gfs2_sbd *sdp = GFS2_SB(inode);
798         struct buffer_head *bh;
799         struct gfs2_holder gh;
800         int need_unlock = 0;
801         int need_endtrans = 0;
802         int ret;
803 
804         if (!(flags & I_DIRTY_INODE))
805                 return;
806         if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
807                 return;
808         if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
809                 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
810                 if (ret) {
811                         fs_err(sdp, "dirty_inode: glock %d\n", ret);
812                         return;
813                 }
814                 need_unlock = 1;
815         } else if (WARN_ON_ONCE(ip->i_gl->gl_state != LM_ST_EXCLUSIVE))
816                 return;
817 
818         if (current->journal_info == NULL) {
819                 ret = gfs2_trans_begin(sdp, RES_DINODE, 0);
820                 if (ret) {
821                         fs_err(sdp, "dirty_inode: gfs2_trans_begin %d\n", ret);
822                         goto out;
823                 }
824                 need_endtrans = 1;
825         }
826 
827         ret = gfs2_meta_inode_buffer(ip, &bh);
828         if (ret == 0) {
829                 gfs2_trans_add_meta(ip->i_gl, bh);
830                 gfs2_dinode_out(ip, bh->b_data);
831                 brelse(bh);
832         }
833 
834         if (need_endtrans)
835                 gfs2_trans_end(sdp);
836 out:
837         if (need_unlock)
838                 gfs2_glock_dq_uninit(&gh);
839 }
840 
841 /**
842  * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
843  * @sdp: the filesystem
844  *
845  * Returns: errno
846  */
847 
848 static int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
849 {
850         struct gfs2_holder freeze_gh;
851         int error;
852 
853         error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, GL_NOCACHE,
854                                    &freeze_gh);
855         if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
856                 return error;
857 
858         flush_workqueue(gfs2_delete_workqueue);
859         kthread_stop(sdp->sd_quotad_process);
860         kthread_stop(sdp->sd_logd_process);
861 
862         gfs2_quota_sync(sdp->sd_vfs, 0);
863         gfs2_statfs_sync(sdp->sd_vfs, 0);
864 
865         gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SHUTDOWN |
866                        GFS2_LFC_MAKE_FS_RO);
867         wait_event(sdp->sd_reserving_log_wait, atomic_read(&sdp->sd_reserving_log) == 0);
868         gfs2_assert_warn(sdp, atomic_read(&sdp->sd_log_blks_free) == sdp->sd_jdesc->jd_blocks);
869 
870         if (gfs2_holder_initialized(&freeze_gh))
871                 gfs2_glock_dq_uninit(&freeze_gh);
872 
873         gfs2_quota_cleanup(sdp);
874 
875         return error;
876 }
877 
878 /**
879  * gfs2_put_super - Unmount the filesystem
880  * @sb: The VFS superblock
881  *
882  */
883 
884 static void gfs2_put_super(struct super_block *sb)
885 {
886         struct gfs2_sbd *sdp = sb->s_fs_info;
887         int error;
888         struct gfs2_jdesc *jd;
889 
890         /* No more recovery requests */
891         set_bit(SDF_NORECOVERY, &sdp->sd_flags);
892         smp_mb();
893 
894         /* Wait on outstanding recovery */
895 restart:
896         spin_lock(&sdp->sd_jindex_spin);
897         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
898                 if (!test_bit(JDF_RECOVERY, &jd->jd_flags))
899                         continue;
900                 spin_unlock(&sdp->sd_jindex_spin);
901                 wait_on_bit(&jd->jd_flags, JDF_RECOVERY,
902                             TASK_UNINTERRUPTIBLE);
903                 goto restart;
904         }
905         spin_unlock(&sdp->sd_jindex_spin);
906 
907         if (!sb_rdonly(sb)) {
908                 error = gfs2_make_fs_ro(sdp);
909                 if (error)
910                         gfs2_io_error(sdp);
911         }
912         /*  At this point, we're through modifying the disk  */
913 
914         /*  Release stuff  */
915 
916         iput(sdp->sd_jindex);
917         iput(sdp->sd_statfs_inode);
918         iput(sdp->sd_rindex);
919         iput(sdp->sd_quota_inode);
920 
921         gfs2_glock_put(sdp->sd_rename_gl);
922         gfs2_glock_put(sdp->sd_freeze_gl);
923 
924         if (!sdp->sd_args.ar_spectator) {
925                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
926                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
927                 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
928                 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
929                 iput(sdp->sd_sc_inode);
930                 iput(sdp->sd_qc_inode);
931         }
932 
933         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
934         gfs2_clear_rgrpd(sdp);
935         gfs2_jindex_free(sdp);
936         /*  Take apart glock structures and buffer lists  */
937         gfs2_gl_hash_clear(sdp);
938         gfs2_delete_debugfs_file(sdp);
939         /*  Unmount the locking protocol  */
940         gfs2_lm_unmount(sdp);
941 
942         /*  At this point, we're through participating in the lockspace  */
943         gfs2_sys_fs_del(sdp);
944 }
945 
946 /**
947  * gfs2_sync_fs - sync the filesystem
948  * @sb: the superblock
949  *
950  * Flushes the log to disk.
951  */
952 
953 static int gfs2_sync_fs(struct super_block *sb, int wait)
954 {
955         struct gfs2_sbd *sdp = sb->s_fs_info;
956 
957         gfs2_quota_sync(sb, -1);
958         if (wait)
959                 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL |
960                                GFS2_LFC_SYNC_FS);
961         return sdp->sd_log_error;
962 }
963 
964 void gfs2_freeze_func(struct work_struct *work)
965 {
966         int error;
967         struct gfs2_holder freeze_gh;
968         struct gfs2_sbd *sdp = container_of(work, struct gfs2_sbd, sd_freeze_work);
969         struct super_block *sb = sdp->sd_vfs;
970 
971         atomic_inc(&sb->s_active);
972         error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, 0,
973                                    &freeze_gh);
974         if (error) {
975                 printk(KERN_INFO "GFS2: couldn't get freeze lock : %d\n", error);
976                 gfs2_assert_withdraw(sdp, 0);
977         }
978         else {
979                 atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN);
980                 error = thaw_super(sb);
981                 if (error) {
982                         printk(KERN_INFO "GFS2: couldn't thaw filesystem: %d\n",
983                                error);
984                         gfs2_assert_withdraw(sdp, 0);
985                 }
986                 if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))
987                         freeze_gh.gh_flags |= GL_NOCACHE;
988                 gfs2_glock_dq_uninit(&freeze_gh);
989         }
990         deactivate_super(sb);
991         return;
992 }
993 
994 /**
995  * gfs2_freeze - prevent further writes to the filesystem
996  * @sb: the VFS structure for the filesystem
997  *
998  */
999 
1000 static int gfs2_freeze(struct super_block *sb)
1001 {
1002         struct gfs2_sbd *sdp = sb->s_fs_info;
1003         int error = 0;
1004 
1005         mutex_lock(&sdp->sd_freeze_mutex);
1006         if (atomic_read(&sdp->sd_freeze_state) != SFS_UNFROZEN)
1007                 goto out;
1008 
1009         if (test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
1010                 error = -EINVAL;
1011                 goto out;
1012         }
1013 
1014         for (;;) {
1015                 error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh);
1016                 if (!error)
1017                         break;
1018 
1019                 switch (error) {
1020                 case -EBUSY:
1021                         fs_err(sdp, "waiting for recovery before freeze\n");
1022                         break;
1023 
1024                 default:
1025                         fs_err(sdp, "error freezing FS: %d\n", error);
1026                         break;
1027                 }
1028 
1029                 fs_err(sdp, "retrying...\n");
1030                 msleep(1000);
1031         }
1032         error = 0;
1033 out:
1034         mutex_unlock(&sdp->sd_freeze_mutex);
1035         return error;
1036 }
1037 
1038 /**
1039  * gfs2_unfreeze - reallow writes to the filesystem
1040  * @sb: the VFS structure for the filesystem
1041  *
1042  */
1043 
1044 static int gfs2_unfreeze(struct super_block *sb)
1045 {
1046         struct gfs2_sbd *sdp = sb->s_fs_info;
1047 
1048         mutex_lock(&sdp->sd_freeze_mutex);
1049         if (atomic_read(&sdp->sd_freeze_state) != SFS_FROZEN ||
1050             !gfs2_holder_initialized(&sdp->sd_freeze_gh)) {
1051                 mutex_unlock(&sdp->sd_freeze_mutex);
1052                 return 0;
1053         }
1054 
1055         gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
1056         mutex_unlock(&sdp->sd_freeze_mutex);
1057         return 0;
1058 }
1059 
1060 /**
1061  * statfs_fill - fill in the sg for a given RG
1062  * @rgd: the RG
1063  * @sc: the sc structure
1064  *
1065  * Returns: 0 on success, -ESTALE if the LVB is invalid
1066  */
1067 
1068 static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
1069                             struct gfs2_statfs_change_host *sc)
1070 {
1071         gfs2_rgrp_verify(rgd);
1072         sc->sc_total += rgd->rd_data;
1073         sc->sc_free += rgd->rd_free;
1074         sc->sc_dinodes += rgd->rd_dinodes;
1075         return 0;
1076 }
1077 
1078 /**
1079  * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
1080  * @sdp: the filesystem
1081  * @sc: the sc info that will be returned
1082  *
1083  * Any error (other than a signal) will cause this routine to fall back
1084  * to the synchronous version.
1085  *
1086  * FIXME: This really shouldn't busy wait like this.
1087  *
1088  * Returns: errno
1089  */
1090 
1091 static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
1092 {
1093         struct gfs2_rgrpd *rgd_next;
1094         struct gfs2_holder *gha, *gh;
1095         unsigned int slots = 64;
1096         unsigned int x;
1097         int done;
1098         int error = 0, err;
1099 
1100         memset(sc, 0, sizeof(struct gfs2_statfs_change_host));
1101         gha = kmalloc_array(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
1102         if (!gha)
1103                 return -ENOMEM;
1104         for (x = 0; x < slots; x++)
1105                 gfs2_holder_mark_uninitialized(gha + x);
1106 
1107         rgd_next = gfs2_rgrpd_get_first(sdp);
1108 
1109         for (;;) {
1110                 done = 1;
1111 
1112                 for (x = 0; x < slots; x++) {
1113                         gh = gha + x;
1114 
1115                         if (gfs2_holder_initialized(gh) && gfs2_glock_poll(gh)) {
1116                                 err = gfs2_glock_wait(gh);
1117                                 if (err) {
1118                                         gfs2_holder_uninit(gh);
1119                                         error = err;
1120                                 } else {
1121                                         if (!error) {
1122                                                 struct gfs2_rgrpd *rgd =
1123                                                         gfs2_glock2rgrp(gh->gh_gl);
1124 
1125                                                 error = statfs_slow_fill(rgd, sc);
1126                                         }
1127                                         gfs2_glock_dq_uninit(gh);
1128                                 }
1129                         }
1130 
1131                         if (gfs2_holder_initialized(gh))
1132                                 done = 0;
1133                         else if (rgd_next && !error) {
1134                                 error = gfs2_glock_nq_init(rgd_next->rd_gl,
1135                                                            LM_ST_SHARED,
1136                                                            GL_ASYNC,
1137                                                            gh);
1138                                 rgd_next = gfs2_rgrpd_get_next(rgd_next);
1139                                 done = 0;
1140                         }
1141 
1142                         if (signal_pending(current))
1143                                 error = -ERESTARTSYS;
1144                 }
1145 
1146                 if (done)
1147                         break;
1148 
1149                 yield();
1150         }
1151 
1152         kfree(gha);
1153         return error;
1154 }
1155 
1156 /**
1157  * gfs2_statfs_i - Do a statfs
1158  * @sdp: the filesystem
1159  * @sg: the sg structure
1160  *
1161  * Returns: errno
1162  */
1163 
1164 static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
1165 {
1166         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
1167         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
1168 
1169         spin_lock(&sdp->sd_statfs_spin);
1170 
1171         *sc = *m_sc;
1172         sc->sc_total += l_sc->sc_total;
1173         sc->sc_free += l_sc->sc_free;
1174         sc->sc_dinodes += l_sc->sc_dinodes;
1175 
1176         spin_unlock(&sdp->sd_statfs_spin);
1177 
1178         if (sc->sc_free < 0)
1179                 sc->sc_free = 0;
1180         if (sc->sc_free > sc->sc_total)
1181                 sc->sc_free = sc->sc_total;
1182         if (sc->sc_dinodes < 0)
1183                 sc->sc_dinodes = 0;
1184 
1185         return 0;
1186 }
1187 
1188 /**
1189  * gfs2_statfs - Gather and return stats about the filesystem
1190  * @sb: The superblock
1191  * @statfsbuf: The buffer
1192  *
1193  * Returns: 0 on success or error code
1194  */
1195 
1196 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1197 {
1198         struct super_block *sb = dentry->d_sb;
1199         struct gfs2_sbd *sdp = sb->s_fs_info;
1200         struct gfs2_statfs_change_host sc;
1201         int error;
1202 
1203         error = gfs2_rindex_update(sdp);
1204         if (error)
1205                 return error;
1206 
1207         if (gfs2_tune_get(sdp, gt_statfs_slow))
1208                 error = gfs2_statfs_slow(sdp, &sc);
1209         else
1210                 error = gfs2_statfs_i(sdp, &sc);
1211 
1212         if (error)
1213                 return error;
1214 
1215         buf->f_type = GFS2_MAGIC;
1216         buf->f_bsize = sdp->sd_sb.sb_bsize;
1217         buf->f_blocks = sc.sc_total;
1218         buf->f_bfree = sc.sc_free;
1219         buf->f_bavail = sc.sc_free;
1220         buf->f_files = sc.sc_dinodes + sc.sc_free;
1221         buf->f_ffree = sc.sc_free;
1222         buf->f_namelen = GFS2_FNAMESIZE;
1223 
1224         return 0;
1225 }
1226 
1227 /**
1228  * gfs2_remount_fs - called when the FS is remounted
1229  * @sb:  the filesystem
1230  * @flags:  the remount flags
1231  * @data:  extra data passed in (not used right now)
1232  *
1233  * Returns: errno
1234  */
1235 
1236 static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data)
1237 {
1238         struct gfs2_sbd *sdp = sb->s_fs_info;
1239         struct gfs2_args args = sdp->sd_args; /* Default to current settings */
1240         struct gfs2_tune *gt = &sdp->sd_tune;
1241         int error;
1242 
1243         sync_filesystem(sb);
1244 
1245         spin_lock(&gt->gt_spin);
1246         args.ar_commit = gt->gt_logd_secs;
1247         args.ar_quota_quantum = gt->gt_quota_quantum;
1248         if (gt->gt_statfs_slow)
1249                 args.ar_statfs_quantum = 0;
1250         else
1251                 args.ar_statfs_quantum = gt->gt_statfs_quantum;
1252         spin_unlock(&gt->gt_spin);
1253         error = gfs2_mount_args(&args, data);
1254         if (error)
1255                 return error;
1256 
1257         /* Not allowed to change locking details */
1258         if (strcmp(args.ar_lockproto, sdp->sd_args.ar_lockproto) ||
1259             strcmp(args.ar_locktable, sdp->sd_args.ar_locktable) ||
1260             strcmp(args.ar_hostdata, sdp->sd_args.ar_hostdata))
1261                 return -EINVAL;
1262 
1263         /* Some flags must not be changed */
1264         if (args_neq(&args, &sdp->sd_args, spectator) ||
1265             args_neq(&args, &sdp->sd_args, localflocks) ||
1266             args_neq(&args, &sdp->sd_args, meta))
1267                 return -EINVAL;
1268 
1269         if (sdp->sd_args.ar_spectator)
1270                 *flags |= SB_RDONLY;
1271 
1272         if ((sb->s_flags ^ *flags) & SB_RDONLY) {
1273                 if (*flags & SB_RDONLY)
1274                         error = gfs2_make_fs_ro(sdp);
1275                 else
1276                         error = gfs2_make_fs_rw(sdp);
1277                 if (error)
1278                         return error;
1279         }
1280 
1281         sdp->sd_args = args;
1282         if (sdp->sd_args.ar_posix_acl)
1283                 sb->s_flags |= SB_POSIXACL;
1284         else
1285                 sb->s_flags &= ~SB_POSIXACL;
1286         if (sdp->sd_args.ar_nobarrier)
1287                 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1288         else
1289                 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1290         spin_lock(&gt->gt_spin);
1291         gt->gt_logd_secs = args.ar_commit;
1292         gt->gt_quota_quantum = args.ar_quota_quantum;
1293         if (args.ar_statfs_quantum) {
1294                 gt->gt_statfs_slow = 0;
1295                 gt->gt_statfs_quantum = args.ar_statfs_quantum;
1296         }
1297         else {
1298                 gt->gt_statfs_slow = 1;
1299                 gt->gt_statfs_quantum = 30;
1300         }
1301         spin_unlock(&gt->gt_spin);
1302 
1303         gfs2_online_uevent(sdp);
1304         return 0;
1305 }
1306 
1307 /**
1308  * gfs2_drop_inode - Drop an inode (test for remote unlink)
1309  * @inode: The inode to drop
1310  *
1311  * If we've received a callback on an iopen lock then it's because a
1312  * remote node tried to deallocate the inode but failed due to this node
1313  * still having the inode open. Here we mark the link count zero
1314  * since we know that it must have reached zero if the GLF_DEMOTE flag
1315  * is set on the iopen glock. If we didn't do a disk read since the
1316  * remote node removed the final link then we might otherwise miss
1317  * this event. This check ensures that this node will deallocate the
1318  * inode's blocks, or alternatively pass the baton on to another
1319  * node for later deallocation.
1320  */
1321 
1322 static int gfs2_drop_inode(struct inode *inode)
1323 {
1324         struct gfs2_inode *ip = GFS2_I(inode);
1325 
1326         if (!test_bit(GIF_FREE_VFS_INODE, &ip->i_flags) &&
1327             inode->i_nlink &&
1328             gfs2_holder_initialized(&ip->i_iopen_gh)) {
1329                 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1330                 if (test_bit(GLF_DEMOTE, &gl->gl_flags))
1331                         clear_nlink(inode);
1332         }
1333 
1334         /*
1335          * When under memory pressure when an inode's link count has dropped to
1336          * zero, defer deleting the inode to the delete workqueue.  This avoids
1337          * calling into DLM under memory pressure, which can deadlock.
1338          */
1339         if (!inode->i_nlink &&
1340             unlikely(current->flags & PF_MEMALLOC) &&
1341             gfs2_holder_initialized(&ip->i_iopen_gh)) {
1342                 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1343 
1344                 gfs2_glock_hold(gl);
1345                 if (queue_work(gfs2_delete_workqueue, &gl->gl_delete) == 0)
1346                         gfs2_glock_queue_put(gl);
1347                 return false;
1348         }
1349 
1350         return generic_drop_inode(inode);
1351 }
1352 
1353 static int is_ancestor(const struct dentry *d1, const struct dentry *d2)
1354 {
1355         do {
1356                 if (d1 == d2)
1357                         return 1;
1358                 d1 = d1->d_parent;
1359         } while (!IS_ROOT(d1));
1360         return 0;
1361 }
1362 
1363 /**
1364  * gfs2_show_options - Show mount options for /proc/mounts
1365  * @s: seq_file structure
1366  * @root: root of this (sub)tree
1367  *
1368  * Returns: 0 on success or error code
1369  */
1370 
1371 static int gfs2_show_options(struct seq_file *s, struct dentry *root)
1372 {
1373         struct gfs2_sbd *sdp = root->d_sb->s_fs_info;
1374         struct gfs2_args *args = &sdp->sd_args;
1375         int val;
1376 
1377         if (is_ancestor(root, sdp->sd_master_dir))
1378                 seq_puts(s, ",meta");
1379         if (args->ar_lockproto[0])
1380                 seq_show_option(s, "lockproto", args->ar_lockproto);
1381         if (args->ar_locktable[0])
1382                 seq_show_option(s, "locktable", args->ar_locktable);
1383         if (args->ar_hostdata[0])
1384                 seq_show_option(s, "hostdata", args->ar_hostdata);
1385         if (args->ar_spectator)
1386                 seq_puts(s, ",spectator");
1387         if (args->ar_localflocks)
1388                 seq_puts(s, ",localflocks");
1389         if (args->ar_debug)
1390                 seq_puts(s, ",debug");
1391         if (args->ar_posix_acl)
1392                 seq_puts(s, ",acl");
1393         if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
1394                 char *state;
1395                 switch (args->ar_quota) {
1396                 case GFS2_QUOTA_OFF:
1397                         state = "off";
1398                         break;
1399                 case GFS2_QUOTA_ACCOUNT:
1400                         state = "account";
1401                         break;
1402                 case GFS2_QUOTA_ON:
1403                         state = "on";
1404                         break;
1405                 default:
1406                         state = "unknown";
1407                         break;
1408                 }
1409                 seq_printf(s, ",quota=%s", state);
1410         }
1411         if (args->ar_suiddir)
1412                 seq_puts(s, ",suiddir");
1413         if (args->ar_data != GFS2_DATA_DEFAULT) {
1414                 char *state;
1415                 switch (args->ar_data) {
1416                 case GFS2_DATA_WRITEBACK:
1417                         state = "writeback";
1418                         break;
1419                 case GFS2_DATA_ORDERED:
1420                         state = "ordered";
1421                         break;
1422                 default:
1423                         state = "unknown";
1424                         break;
1425                 }
1426                 seq_printf(s, ",data=%s", state);
1427         }
1428         if (args->ar_discard)
1429                 seq_puts(s, ",discard");
1430         val = sdp->sd_tune.gt_logd_secs;
1431         if (val != 30)
1432                 seq_printf(s, ",commit=%d", val);
1433         val = sdp->sd_tune.gt_statfs_quantum;
1434         if (val != 30)
1435                 seq_printf(s, ",statfs_quantum=%d", val);
1436         else if (sdp->sd_tune.gt_statfs_slow)
1437                 seq_puts(s, ",statfs_quantum=0");
1438         val = sdp->sd_tune.gt_quota_quantum;
1439         if (val != 60)
1440                 seq_printf(s, ",quota_quantum=%d", val);
1441         if (args->ar_statfs_percent)
1442                 seq_printf(s, ",statfs_percent=%d", args->ar_statfs_percent);
1443         if (args->ar_errors != GFS2_ERRORS_DEFAULT) {
1444                 const char *state;
1445 
1446                 switch (args->ar_errors) {
1447                 case GFS2_ERRORS_WITHDRAW:
1448                         state = "withdraw";
1449                         break;
1450                 case GFS2_ERRORS_PANIC:
1451                         state = "panic";
1452                         break;
1453                 default:
1454                         state = "unknown";
1455                         break;
1456                 }
1457                 seq_printf(s, ",errors=%s", state);
1458         }
1459         if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags))
1460                 seq_puts(s, ",nobarrier");
1461         if (test_bit(SDF_DEMOTE, &sdp->sd_flags))
1462                 seq_puts(s, ",demote_interface_used");
1463         if (args->ar_rgrplvb)
1464                 seq_puts(s, ",rgrplvb");
1465         if (args->ar_loccookie)
1466                 seq_puts(s, ",loccookie");
1467         return 0;
1468 }
1469 
1470 static void gfs2_final_release_pages(struct gfs2_inode *ip)
1471 {
1472         struct inode *inode = &ip->i_inode;
1473         struct gfs2_glock *gl = ip->i_gl;
1474 
1475         truncate_inode_pages(gfs2_glock2aspace(ip->i_gl), 0);
1476         truncate_inode_pages(&inode->i_data, 0);
1477 
1478         if (atomic_read(&gl->gl_revokes) == 0) {
1479                 clear_bit(GLF_LFLUSH, &gl->gl_flags);
1480                 clear_bit(GLF_DIRTY, &gl->gl_flags);
1481         }
1482 }
1483 
1484 static int gfs2_dinode_dealloc(struct gfs2_inode *ip)
1485 {
1486         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1487         struct gfs2_rgrpd *rgd;
1488         struct gfs2_holder gh;
1489         int error;
1490 
1491         if (gfs2_get_inode_blocks(&ip->i_inode) != 1) {
1492                 gfs2_consist_inode(ip);
1493                 return -EIO;
1494         }
1495 
1496         error = gfs2_rindex_update(sdp);
1497         if (error)
1498                 return error;
1499 
1500         error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
1501         if (error)
1502                 return error;
1503 
1504         rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1505         if (!rgd) {
1506                 gfs2_consist_inode(ip);
1507                 error = -EIO;
1508                 goto out_qs;
1509         }
1510 
1511         error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
1512         if (error)
1513                 goto out_qs;
1514 
1515         error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA,
1516                                  sdp->sd_jdesc->jd_blocks);
1517         if (error)
1518                 goto out_rg_gunlock;
1519 
1520         gfs2_free_di(rgd, ip);
1521 
1522         gfs2_final_release_pages(ip);
1523 
1524         gfs2_trans_end(sdp);
1525 
1526 out_rg_gunlock:
1527         gfs2_glock_dq_uninit(&gh);
1528 out_qs:
1529         gfs2_quota_unhold(ip);
1530         return error;
1531 }
1532 
1533 /**
1534  * gfs2_glock_put_eventually
1535  * @gl: The glock to put
1536  *
1537  * When under memory pressure, trigger a deferred glock put to make sure we
1538  * won't call into DLM and deadlock.  Otherwise, put the glock directly.
1539  */
1540 
1541 static void gfs2_glock_put_eventually(struct gfs2_glock *gl)
1542 {
1543         if (current->flags & PF_MEMALLOC)
1544                 gfs2_glock_queue_put(gl);
1545         else
1546                 gfs2_glock_put(gl);
1547 }
1548 
1549 /**
1550  * gfs2_evict_inode - Remove an inode from cache
1551  * @inode: The inode to evict
1552  *
1553  * There are three cases to consider:
1554  * 1. i_nlink == 0, we are final opener (and must deallocate)
1555  * 2. i_nlink == 0, we are not the final opener (and cannot deallocate)
1556  * 3. i_nlink > 0
1557  *
1558  * If the fs is read only, then we have to treat all cases as per #3
1559  * since we are unable to do any deallocation. The inode will be
1560  * deallocated by the next read/write node to attempt an allocation
1561  * in the same resource group
1562  *
1563  * We have to (at the moment) hold the inodes main lock to cover
1564  * the gap between unlocking the shared lock on the iopen lock and
1565  * taking the exclusive lock. I'd rather do a shared -> exclusive
1566  * conversion on the iopen lock, but we can change that later. This
1567  * is safe, just less efficient.
1568  */
1569 
1570 static void gfs2_evict_inode(struct inode *inode)
1571 {
1572         struct super_block *sb = inode->i_sb;
1573         struct gfs2_sbd *sdp = sb->s_fs_info;
1574         struct gfs2_inode *ip = GFS2_I(inode);
1575         struct gfs2_holder gh;
1576         struct address_space *metamapping;
1577         int error;
1578 
1579         if (test_bit(GIF_FREE_VFS_INODE, &ip->i_flags)) {
1580                 clear_inode(inode);
1581                 return;
1582         }
1583 
1584         if (inode->i_nlink || sb_rdonly(sb))
1585                 goto out;
1586 
1587         if (test_bit(GIF_ALLOC_FAILED, &ip->i_flags)) {
1588                 BUG_ON(!gfs2_glock_is_locked_by_me(ip->i_gl));
1589                 gfs2_holder_mark_uninitialized(&gh);
1590                 goto alloc_failed;
1591         }
1592 
1593         /* Deletes should never happen under memory pressure anymore.  */
1594         if (WARN_ON_ONCE(current->flags & PF_MEMALLOC))
1595                 goto out;
1596 
1597         /* Must not read inode block until block type has been verified */
1598         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh);
1599         if (unlikely(error)) {
1600                 glock_clear_object(ip->i_iopen_gh.gh_gl, ip);
1601                 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1602                 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1603                 goto out;
1604         }
1605 
1606         error = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED);
1607         if (error)
1608                 goto out_truncate;
1609 
1610         if (test_bit(GIF_INVALID, &ip->i_flags)) {
1611                 error = gfs2_inode_refresh(ip);
1612                 if (error)
1613                         goto out_truncate;
1614         }
1615 
1616         /*
1617          * The inode may have been recreated in the meantime.
1618          */
1619         if (inode->i_nlink)
1620                 goto out_truncate;
1621 
1622 alloc_failed:
1623         if (gfs2_holder_initialized(&ip->i_iopen_gh) &&
1624             test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) {
1625                 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1626                 gfs2_glock_dq_wait(&ip->i_iopen_gh);
1627                 gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE,
1628                                    &ip->i_iopen_gh);
1629                 error = gfs2_glock_nq(&ip->i_iopen_gh);
1630                 if (error)
1631                         goto out_truncate;
1632         }
1633 
1634         /* Case 1 starts here */
1635 
1636         if (S_ISDIR(inode->i_mode) &&
1637             (ip->i_diskflags & GFS2_DIF_EXHASH)) {
1638                 error = gfs2_dir_exhash_dealloc(ip);
1639                 if (error)
1640                         goto out_unlock;
1641         }
1642 
1643         if (ip->i_eattr) {
1644                 error = gfs2_ea_dealloc(ip);
1645                 if (error)
1646                         goto out_unlock;
1647         }
1648 
1649         if (!gfs2_is_stuffed(ip)) {
1650                 error = gfs2_file_dealloc(ip);
1651                 if (error)
1652                         goto out_unlock;
1653         }
1654 
1655         /* We're about to clear the bitmap for the dinode, but as soon as we
1656            do, gfs2_create_inode can create another inode at the same block
1657            location and try to set gl_object again. We clear gl_object here so
1658            that subsequent inode creates don't see an old gl_object. */
1659         glock_clear_object(ip->i_gl, ip);
1660         error = gfs2_dinode_dealloc(ip);
1661         goto out_unlock;
1662 
1663 out_truncate:
1664         gfs2_log_flush(sdp, ip->i_gl, GFS2_LOG_HEAD_FLUSH_NORMAL |
1665                        GFS2_LFC_EVICT_INODE);
1666         metamapping = gfs2_glock2aspace(ip->i_gl);
1667         if (test_bit(GLF_DIRTY, &ip->i_gl->gl_flags)) {
1668                 filemap_fdatawrite(metamapping);
1669                 filemap_fdatawait(metamapping);
1670         }
1671         write_inode_now(inode, 1);
1672         gfs2_ail_flush(ip->i_gl, 0);
1673 
1674         /* Case 2 starts here */
1675         error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
1676         if (error)
1677                 goto out_unlock;
1678         /* Needs to be done before glock release & also in a transaction */
1679         truncate_inode_pages(&inode->i_data, 0);
1680         truncate_inode_pages(metamapping, 0);
1681         gfs2_trans_end(sdp);
1682 
1683 out_unlock:
1684         /* Error path for case 1 */
1685         if (gfs2_rs_active(&ip->i_res))
1686                 gfs2_rs_deltree(&ip->i_res);
1687 
1688         if (gfs2_holder_initialized(&ip->i_iopen_gh)) {
1689                 glock_clear_object(ip->i_iopen_gh.gh_gl, ip);
1690                 if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) {
1691                         ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1692                         gfs2_glock_dq(&ip->i_iopen_gh);
1693                 }
1694                 gfs2_holder_uninit(&ip->i_iopen_gh);
1695         }
1696         if (gfs2_holder_initialized(&gh)) {
1697                 glock_clear_object(ip->i_gl, ip);
1698                 gfs2_glock_dq_uninit(&gh);
1699         }
1700         if (error && error != GLR_TRYFAILED && error != -EROFS)
1701                 fs_warn(sdp, "gfs2_evict_inode: %d\n", error);
1702 out:
1703         /* Case 3 starts here */
1704         truncate_inode_pages_final(&inode->i_data);
1705         gfs2_rsqa_delete(ip, NULL);
1706         gfs2_ordered_del_inode(ip);
1707         clear_inode(inode);
1708         gfs2_dir_hash_inval(ip);
1709         glock_clear_object(ip->i_gl, ip);
1710         wait_on_bit_io(&ip->i_flags, GIF_GLOP_PENDING, TASK_UNINTERRUPTIBLE);
1711         gfs2_glock_add_to_lru(ip->i_gl);
1712         gfs2_glock_put_eventually(ip->i_gl);
1713         ip->i_gl = NULL;
1714         if (gfs2_holder_initialized(&ip->i_iopen_gh)) {
1715                 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1716 
1717                 glock_clear_object(gl, ip);
1718                 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1719                 gfs2_glock_hold(gl);
1720                 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1721                 gfs2_glock_put_eventually(gl);
1722         }
1723 }
1724 
1725 static struct inode *gfs2_alloc_inode(struct super_block *sb)
1726 {
1727         struct gfs2_inode *ip;
1728 
1729         ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
1730         if (ip) {
1731                 ip->i_flags = 0;
1732                 ip->i_gl = NULL;
1733                 memset(&ip->i_res, 0, sizeof(ip->i_res));
1734                 RB_CLEAR_NODE(&ip->i_res.rs_node);
1735                 ip->i_rahead = 0;
1736         }
1737         return &ip->i_inode;
1738 }
1739 
1740 static void gfs2_i_callback(struct rcu_head *head)
1741 {
1742         struct inode *inode = container_of(head, struct inode, i_rcu);
1743         kmem_cache_free(gfs2_inode_cachep, inode);
1744 }
1745 
1746 static void gfs2_destroy_inode(struct inode *inode)
1747 {
1748         call_rcu(&inode->i_rcu, gfs2_i_callback);
1749 }
1750 
1751 const struct super_operations gfs2_super_ops = {
1752         .alloc_inode            = gfs2_alloc_inode,
1753         .destroy_inode          = gfs2_destroy_inode,
1754         .write_inode            = gfs2_write_inode,
1755         .dirty_inode            = gfs2_dirty_inode,
1756         .evict_inode            = gfs2_evict_inode,
1757         .put_super              = gfs2_put_super,
1758         .sync_fs                = gfs2_sync_fs,
1759         .freeze_super           = gfs2_freeze,
1760         .thaw_super             = gfs2_unfreeze,
1761         .statfs                 = gfs2_statfs,
1762         .remount_fs             = gfs2_remount_fs,
1763         .drop_inode             = gfs2_drop_inode,
1764         .show_options           = gfs2_show_options,
1765 };
1766 
1767 

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