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Linux/fs/gfs2/super.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
  4  * Copyright (C) 2004-2007 Red Hat, Inc.  All rights reserved.
  5  */
  6 
  7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  8 
  9 #include <linux/bio.h>
 10 #include <linux/sched/signal.h>
 11 #include <linux/slab.h>
 12 #include <linux/spinlock.h>
 13 #include <linux/completion.h>
 14 #include <linux/buffer_head.h>
 15 #include <linux/statfs.h>
 16 #include <linux/seq_file.h>
 17 #include <linux/mount.h>
 18 #include <linux/kthread.h>
 19 #include <linux/delay.h>
 20 #include <linux/gfs2_ondisk.h>
 21 #include <linux/crc32.h>
 22 #include <linux/time.h>
 23 #include <linux/wait.h>
 24 #include <linux/writeback.h>
 25 #include <linux/backing-dev.h>
 26 #include <linux/kernel.h>
 27 
 28 #include "gfs2.h"
 29 #include "incore.h"
 30 #include "bmap.h"
 31 #include "dir.h"
 32 #include "glock.h"
 33 #include "glops.h"
 34 #include "inode.h"
 35 #include "log.h"
 36 #include "meta_io.h"
 37 #include "quota.h"
 38 #include "recovery.h"
 39 #include "rgrp.h"
 40 #include "super.h"
 41 #include "trans.h"
 42 #include "util.h"
 43 #include "sys.h"
 44 #include "xattr.h"
 45 #include "lops.h"
 46 
 47 #define args_neq(a1, a2, x) ((a1)->ar_##x != (a2)->ar_##x)
 48 
 49 enum {
 50         Opt_lockproto,
 51         Opt_locktable,
 52         Opt_hostdata,
 53         Opt_spectator,
 54         Opt_ignore_local_fs,
 55         Opt_localflocks,
 56         Opt_localcaching,
 57         Opt_debug,
 58         Opt_nodebug,
 59         Opt_upgrade,
 60         Opt_acl,
 61         Opt_noacl,
 62         Opt_quota_off,
 63         Opt_quota_account,
 64         Opt_quota_on,
 65         Opt_quota,
 66         Opt_noquota,
 67         Opt_suiddir,
 68         Opt_nosuiddir,
 69         Opt_data_writeback,
 70         Opt_data_ordered,
 71         Opt_meta,
 72         Opt_discard,
 73         Opt_nodiscard,
 74         Opt_commit,
 75         Opt_err_withdraw,
 76         Opt_err_panic,
 77         Opt_statfs_quantum,
 78         Opt_statfs_percent,
 79         Opt_quota_quantum,
 80         Opt_barrier,
 81         Opt_nobarrier,
 82         Opt_rgrplvb,
 83         Opt_norgrplvb,
 84         Opt_loccookie,
 85         Opt_noloccookie,
 86         Opt_error,
 87 };
 88 
 89 static const match_table_t tokens = {
 90         {Opt_lockproto, "lockproto=%s"},
 91         {Opt_locktable, "locktable=%s"},
 92         {Opt_hostdata, "hostdata=%s"},
 93         {Opt_spectator, "spectator"},
 94         {Opt_spectator, "norecovery"},
 95         {Opt_ignore_local_fs, "ignore_local_fs"},
 96         {Opt_localflocks, "localflocks"},
 97         {Opt_localcaching, "localcaching"},
 98         {Opt_debug, "debug"},
 99         {Opt_nodebug, "nodebug"},
100         {Opt_upgrade, "upgrade"},
101         {Opt_acl, "acl"},
102         {Opt_noacl, "noacl"},
103         {Opt_quota_off, "quota=off"},
104         {Opt_quota_account, "quota=account"},
105         {Opt_quota_on, "quota=on"},
106         {Opt_quota, "quota"},
107         {Opt_noquota, "noquota"},
108         {Opt_suiddir, "suiddir"},
109         {Opt_nosuiddir, "nosuiddir"},
110         {Opt_data_writeback, "data=writeback"},
111         {Opt_data_ordered, "data=ordered"},
112         {Opt_meta, "meta"},
113         {Opt_discard, "discard"},
114         {Opt_nodiscard, "nodiscard"},
115         {Opt_commit, "commit=%d"},
116         {Opt_err_withdraw, "errors=withdraw"},
117         {Opt_err_panic, "errors=panic"},
118         {Opt_statfs_quantum, "statfs_quantum=%d"},
119         {Opt_statfs_percent, "statfs_percent=%d"},
120         {Opt_quota_quantum, "quota_quantum=%d"},
121         {Opt_barrier, "barrier"},
122         {Opt_nobarrier, "nobarrier"},
123         {Opt_rgrplvb, "rgrplvb"},
124         {Opt_norgrplvb, "norgrplvb"},
125         {Opt_loccookie, "loccookie"},
126         {Opt_noloccookie, "noloccookie"},
127         {Opt_error, NULL}
128 };
129 
130 /**
131  * gfs2_mount_args - Parse mount options
132  * @args: The structure into which the parsed options will be written
133  * @options: The options to parse
134  *
135  * Return: errno
136  */
137 
138 int gfs2_mount_args(struct gfs2_args *args, char *options)
139 {
140         char *o;
141         int token;
142         substring_t tmp[MAX_OPT_ARGS];
143         int rv;
144 
145         /* Split the options into tokens with the "," character and
146            process them */
147 
148         while (1) {
149                 o = strsep(&options, ",");
150                 if (o == NULL)
151                         break;
152                 if (*o == '\0')
153                         continue;
154 
155                 token = match_token(o, tokens, tmp);
156                 switch (token) {
157                 case Opt_lockproto:
158                         match_strlcpy(args->ar_lockproto, &tmp[0],
159                                       GFS2_LOCKNAME_LEN);
160                         break;
161                 case Opt_locktable:
162                         match_strlcpy(args->ar_locktable, &tmp[0],
163                                       GFS2_LOCKNAME_LEN);
164                         break;
165                 case Opt_hostdata:
166                         match_strlcpy(args->ar_hostdata, &tmp[0],
167                                       GFS2_LOCKNAME_LEN);
168                         break;
169                 case Opt_spectator:
170                         args->ar_spectator = 1;
171                         break;
172                 case Opt_ignore_local_fs:
173                         /* Retained for backwards compat only */
174                         break;
175                 case Opt_localflocks:
176                         args->ar_localflocks = 1;
177                         break;
178                 case Opt_localcaching:
179                         /* Retained for backwards compat only */
180                         break;
181                 case Opt_debug:
182                         if (args->ar_errors == GFS2_ERRORS_PANIC) {
183                                 pr_warn("-o debug and -o errors=panic are mutually exclusive\n");
184                                 return -EINVAL;
185                         }
186                         args->ar_debug = 1;
187                         break;
188                 case Opt_nodebug:
189                         args->ar_debug = 0;
190                         break;
191                 case Opt_upgrade:
192                         /* Retained for backwards compat only */
193                         break;
194                 case Opt_acl:
195                         args->ar_posix_acl = 1;
196                         break;
197                 case Opt_noacl:
198                         args->ar_posix_acl = 0;
199                         break;
200                 case Opt_quota_off:
201                 case Opt_noquota:
202                         args->ar_quota = GFS2_QUOTA_OFF;
203                         break;
204                 case Opt_quota_account:
205                         args->ar_quota = GFS2_QUOTA_ACCOUNT;
206                         break;
207                 case Opt_quota_on:
208                 case Opt_quota:
209                         args->ar_quota = GFS2_QUOTA_ON;
210                         break;
211                 case Opt_suiddir:
212                         args->ar_suiddir = 1;
213                         break;
214                 case Opt_nosuiddir:
215                         args->ar_suiddir = 0;
216                         break;
217                 case Opt_data_writeback:
218                         args->ar_data = GFS2_DATA_WRITEBACK;
219                         break;
220                 case Opt_data_ordered:
221                         args->ar_data = GFS2_DATA_ORDERED;
222                         break;
223                 case Opt_meta:
224                         args->ar_meta = 1;
225                         break;
226                 case Opt_discard:
227                         args->ar_discard = 1;
228                         break;
229                 case Opt_nodiscard:
230                         args->ar_discard = 0;
231                         break;
232                 case Opt_commit:
233                         rv = match_int(&tmp[0], &args->ar_commit);
234                         if (rv || args->ar_commit <= 0) {
235                                 pr_warn("commit mount option requires a positive numeric argument\n");
236                                 return rv ? rv : -EINVAL;
237                         }
238                         break;
239                 case Opt_statfs_quantum:
240                         rv = match_int(&tmp[0], &args->ar_statfs_quantum);
241                         if (rv || args->ar_statfs_quantum < 0) {
242                                 pr_warn("statfs_quantum mount option requires a non-negative numeric argument\n");
243                                 return rv ? rv : -EINVAL;
244                         }
245                         break;
246                 case Opt_quota_quantum:
247                         rv = match_int(&tmp[0], &args->ar_quota_quantum);
248                         if (rv || args->ar_quota_quantum <= 0) {
249                                 pr_warn("quota_quantum mount option requires a positive numeric argument\n");
250                                 return rv ? rv : -EINVAL;
251                         }
252                         break;
253                 case Opt_statfs_percent:
254                         rv = match_int(&tmp[0], &args->ar_statfs_percent);
255                         if (rv || args->ar_statfs_percent < 0 ||
256                             args->ar_statfs_percent > 100) {
257                                 pr_warn("statfs_percent mount option requires a numeric argument between 0 and 100\n");
258                                 return rv ? rv : -EINVAL;
259                         }
260                         break;
261                 case Opt_err_withdraw:
262                         args->ar_errors = GFS2_ERRORS_WITHDRAW;
263                         break;
264                 case Opt_err_panic:
265                         if (args->ar_debug) {
266                                 pr_warn("-o debug and -o errors=panic are mutually exclusive\n");
267                                 return -EINVAL;
268                         }
269                         args->ar_errors = GFS2_ERRORS_PANIC;
270                         break;
271                 case Opt_barrier:
272                         args->ar_nobarrier = 0;
273                         break;
274                 case Opt_nobarrier:
275                         args->ar_nobarrier = 1;
276                         break;
277                 case Opt_rgrplvb:
278                         args->ar_rgrplvb = 1;
279                         break;
280                 case Opt_norgrplvb:
281                         args->ar_rgrplvb = 0;
282                         break;
283                 case Opt_loccookie:
284                         args->ar_loccookie = 1;
285                         break;
286                 case Opt_noloccookie:
287                         args->ar_loccookie = 0;
288                         break;
289                 case Opt_error:
290                 default:
291                         pr_warn("invalid mount option: %s\n", o);
292                         return -EINVAL;
293                 }
294         }
295 
296         return 0;
297 }
298 
299 /**
300  * gfs2_jindex_free - Clear all the journal index information
301  * @sdp: The GFS2 superblock
302  *
303  */
304 
305 void gfs2_jindex_free(struct gfs2_sbd *sdp)
306 {
307         struct list_head list;
308         struct gfs2_jdesc *jd;
309 
310         spin_lock(&sdp->sd_jindex_spin);
311         list_add(&list, &sdp->sd_jindex_list);
312         list_del_init(&sdp->sd_jindex_list);
313         sdp->sd_journals = 0;
314         spin_unlock(&sdp->sd_jindex_spin);
315 
316         while (!list_empty(&list)) {
317                 jd = list_entry(list.next, struct gfs2_jdesc, jd_list);
318                 gfs2_free_journal_extents(jd);
319                 list_del(&jd->jd_list);
320                 iput(jd->jd_inode);
321                 kfree(jd);
322         }
323 }
324 
325 static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid)
326 {
327         struct gfs2_jdesc *jd;
328         int found = 0;
329 
330         list_for_each_entry(jd, head, jd_list) {
331                 if (jd->jd_jid == jid) {
332                         found = 1;
333                         break;
334                 }
335         }
336 
337         if (!found)
338                 jd = NULL;
339 
340         return jd;
341 }
342 
343 struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid)
344 {
345         struct gfs2_jdesc *jd;
346 
347         spin_lock(&sdp->sd_jindex_spin);
348         jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
349         spin_unlock(&sdp->sd_jindex_spin);
350 
351         return jd;
352 }
353 
354 int gfs2_jdesc_check(struct gfs2_jdesc *jd)
355 {
356         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
357         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
358         u64 size = i_size_read(jd->jd_inode);
359 
360         if (gfs2_check_internal_file_size(jd->jd_inode, 8 << 20, BIT(30)))
361                 return -EIO;
362 
363         jd->jd_blocks = size >> sdp->sd_sb.sb_bsize_shift;
364 
365         if (gfs2_write_alloc_required(ip, 0, size)) {
366                 gfs2_consist_inode(ip);
367                 return -EIO;
368         }
369 
370         return 0;
371 }
372 
373 static int init_threads(struct gfs2_sbd *sdp)
374 {
375         struct task_struct *p;
376         int error = 0;
377 
378         p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
379         if (IS_ERR(p)) {
380                 error = PTR_ERR(p);
381                 fs_err(sdp, "can't start logd thread: %d\n", error);
382                 return error;
383         }
384         sdp->sd_logd_process = p;
385 
386         p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
387         if (IS_ERR(p)) {
388                 error = PTR_ERR(p);
389                 fs_err(sdp, "can't start quotad thread: %d\n", error);
390                 goto fail;
391         }
392         sdp->sd_quotad_process = p;
393         return 0;
394 
395 fail:
396         kthread_stop(sdp->sd_logd_process);
397         sdp->sd_logd_process = NULL;
398         return error;
399 }
400 
401 /**
402  * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
403  * @sdp: the filesystem
404  *
405  * Returns: errno
406  */
407 
408 int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
409 {
410         struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
411         struct gfs2_glock *j_gl = ip->i_gl;
412         struct gfs2_holder freeze_gh;
413         struct gfs2_log_header_host head;
414         int error;
415 
416         error = init_threads(sdp);
417         if (error)
418                 return error;
419 
420         error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, 0,
421                                    &freeze_gh);
422         if (error)
423                 goto fail_threads;
424 
425         j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
426 
427         error = gfs2_find_jhead(sdp->sd_jdesc, &head, false);
428         if (error)
429                 goto fail;
430 
431         if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
432                 gfs2_consist(sdp);
433                 error = -EIO;
434                 goto fail;
435         }
436 
437         /*  Initialize some head of the log stuff  */
438         sdp->sd_log_sequence = head.lh_sequence + 1;
439         gfs2_log_pointers_init(sdp, head.lh_blkno);
440 
441         error = gfs2_quota_init(sdp);
442         if (error)
443                 goto fail;
444 
445         set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
446 
447         gfs2_glock_dq_uninit(&freeze_gh);
448 
449         return 0;
450 
451 fail:
452         freeze_gh.gh_flags |= GL_NOCACHE;
453         gfs2_glock_dq_uninit(&freeze_gh);
454 fail_threads:
455         if (sdp->sd_quotad_process)
456                 kthread_stop(sdp->sd_quotad_process);
457         sdp->sd_quotad_process = NULL;
458         if (sdp->sd_logd_process)
459                 kthread_stop(sdp->sd_logd_process);
460         sdp->sd_logd_process = NULL;
461         return error;
462 }
463 
464 void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf)
465 {
466         const struct gfs2_statfs_change *str = buf;
467 
468         sc->sc_total = be64_to_cpu(str->sc_total);
469         sc->sc_free = be64_to_cpu(str->sc_free);
470         sc->sc_dinodes = be64_to_cpu(str->sc_dinodes);
471 }
472 
473 static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf)
474 {
475         struct gfs2_statfs_change *str = buf;
476 
477         str->sc_total = cpu_to_be64(sc->sc_total);
478         str->sc_free = cpu_to_be64(sc->sc_free);
479         str->sc_dinodes = cpu_to_be64(sc->sc_dinodes);
480 }
481 
482 int gfs2_statfs_init(struct gfs2_sbd *sdp)
483 {
484         struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
485         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
486         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
487         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
488         struct buffer_head *m_bh, *l_bh;
489         struct gfs2_holder gh;
490         int error;
491 
492         error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
493                                    &gh);
494         if (error)
495                 return error;
496 
497         error = gfs2_meta_inode_buffer(m_ip, &m_bh);
498         if (error)
499                 goto out;
500 
501         if (sdp->sd_args.ar_spectator) {
502                 spin_lock(&sdp->sd_statfs_spin);
503                 gfs2_statfs_change_in(m_sc, m_bh->b_data +
504                                       sizeof(struct gfs2_dinode));
505                 spin_unlock(&sdp->sd_statfs_spin);
506         } else {
507                 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
508                 if (error)
509                         goto out_m_bh;
510 
511                 spin_lock(&sdp->sd_statfs_spin);
512                 gfs2_statfs_change_in(m_sc, m_bh->b_data +
513                                       sizeof(struct gfs2_dinode));
514                 gfs2_statfs_change_in(l_sc, l_bh->b_data +
515                                       sizeof(struct gfs2_dinode));
516                 spin_unlock(&sdp->sd_statfs_spin);
517 
518                 brelse(l_bh);
519         }
520 
521 out_m_bh:
522         brelse(m_bh);
523 out:
524         gfs2_glock_dq_uninit(&gh);
525         return 0;
526 }
527 
528 void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free,
529                         s64 dinodes)
530 {
531         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
532         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
533         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
534         struct buffer_head *l_bh;
535         s64 x, y;
536         int need_sync = 0;
537         int error;
538 
539         error = gfs2_meta_inode_buffer(l_ip, &l_bh);
540         if (error)
541                 return;
542 
543         gfs2_trans_add_meta(l_ip->i_gl, l_bh);
544 
545         spin_lock(&sdp->sd_statfs_spin);
546         l_sc->sc_total += total;
547         l_sc->sc_free += free;
548         l_sc->sc_dinodes += dinodes;
549         gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode));
550         if (sdp->sd_args.ar_statfs_percent) {
551                 x = 100 * l_sc->sc_free;
552                 y = m_sc->sc_free * sdp->sd_args.ar_statfs_percent;
553                 if (x >= y || x <= -y)
554                         need_sync = 1;
555         }
556         spin_unlock(&sdp->sd_statfs_spin);
557 
558         brelse(l_bh);
559         if (need_sync)
560                 gfs2_wake_up_statfs(sdp);
561 }
562 
563 void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh,
564                    struct buffer_head *l_bh)
565 {
566         struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
567         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
568         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
569         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
570 
571         gfs2_trans_add_meta(l_ip->i_gl, l_bh);
572         gfs2_trans_add_meta(m_ip->i_gl, m_bh);
573 
574         spin_lock(&sdp->sd_statfs_spin);
575         m_sc->sc_total += l_sc->sc_total;
576         m_sc->sc_free += l_sc->sc_free;
577         m_sc->sc_dinodes += l_sc->sc_dinodes;
578         memset(l_sc, 0, sizeof(struct gfs2_statfs_change));
579         memset(l_bh->b_data + sizeof(struct gfs2_dinode),
580                0, sizeof(struct gfs2_statfs_change));
581         gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
582         spin_unlock(&sdp->sd_statfs_spin);
583 }
584 
585 int gfs2_statfs_sync(struct super_block *sb, int type)
586 {
587         struct gfs2_sbd *sdp = sb->s_fs_info;
588         struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
589         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
590         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
591         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
592         struct gfs2_holder gh;
593         struct buffer_head *m_bh, *l_bh;
594         int error;
595 
596         sb_start_write(sb);
597         error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
598                                    &gh);
599         if (error)
600                 goto out;
601 
602         error = gfs2_meta_inode_buffer(m_ip, &m_bh);
603         if (error)
604                 goto out_unlock;
605 
606         spin_lock(&sdp->sd_statfs_spin);
607         gfs2_statfs_change_in(m_sc, m_bh->b_data +
608                               sizeof(struct gfs2_dinode));
609         if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) {
610                 spin_unlock(&sdp->sd_statfs_spin);
611                 goto out_bh;
612         }
613         spin_unlock(&sdp->sd_statfs_spin);
614 
615         error = gfs2_meta_inode_buffer(l_ip, &l_bh);
616         if (error)
617                 goto out_bh;
618 
619         error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
620         if (error)
621                 goto out_bh2;
622 
623         update_statfs(sdp, m_bh, l_bh);
624         sdp->sd_statfs_force_sync = 0;
625 
626         gfs2_trans_end(sdp);
627 
628 out_bh2:
629         brelse(l_bh);
630 out_bh:
631         brelse(m_bh);
632 out_unlock:
633         gfs2_glock_dq_uninit(&gh);
634 out:
635         sb_end_write(sb);
636         return error;
637 }
638 
639 struct lfcc {
640         struct list_head list;
641         struct gfs2_holder gh;
642 };
643 
644 /**
645  * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
646  *                            journals are clean
647  * @sdp: the file system
648  * @state: the state to put the transaction lock into
649  * @t_gh: the hold on the transaction lock
650  *
651  * Returns: errno
652  */
653 
654 static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp,
655                                     struct gfs2_holder *freeze_gh)
656 {
657         struct gfs2_inode *ip;
658         struct gfs2_jdesc *jd;
659         struct lfcc *lfcc;
660         LIST_HEAD(list);
661         struct gfs2_log_header_host lh;
662         int error;
663 
664         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
665                 lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
666                 if (!lfcc) {
667                         error = -ENOMEM;
668                         goto out;
669                 }
670                 ip = GFS2_I(jd->jd_inode);
671                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh);
672                 if (error) {
673                         kfree(lfcc);
674                         goto out;
675                 }
676                 list_add(&lfcc->list, &list);
677         }
678 
679         error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_EXCLUSIVE,
680                                    GL_NOCACHE, freeze_gh);
681 
682         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
683                 error = gfs2_jdesc_check(jd);
684                 if (error)
685                         break;
686                 error = gfs2_find_jhead(jd, &lh, false);
687                 if (error)
688                         break;
689                 if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
690                         error = -EBUSY;
691                         break;
692                 }
693         }
694 
695         if (error)
696                 gfs2_glock_dq_uninit(freeze_gh);
697 
698 out:
699         while (!list_empty(&list)) {
700                 lfcc = list_entry(list.next, struct lfcc, list);
701                 list_del(&lfcc->list);
702                 gfs2_glock_dq_uninit(&lfcc->gh);
703                 kfree(lfcc);
704         }
705         return error;
706 }
707 
708 void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf)
709 {
710         struct gfs2_dinode *str = buf;
711 
712         str->di_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
713         str->di_header.mh_type = cpu_to_be32(GFS2_METATYPE_DI);
714         str->di_header.mh_format = cpu_to_be32(GFS2_FORMAT_DI);
715         str->di_num.no_addr = cpu_to_be64(ip->i_no_addr);
716         str->di_num.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino);
717         str->di_mode = cpu_to_be32(ip->i_inode.i_mode);
718         str->di_uid = cpu_to_be32(i_uid_read(&ip->i_inode));
719         str->di_gid = cpu_to_be32(i_gid_read(&ip->i_inode));
720         str->di_nlink = cpu_to_be32(ip->i_inode.i_nlink);
721         str->di_size = cpu_to_be64(i_size_read(&ip->i_inode));
722         str->di_blocks = cpu_to_be64(gfs2_get_inode_blocks(&ip->i_inode));
723         str->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec);
724         str->di_mtime = cpu_to_be64(ip->i_inode.i_mtime.tv_sec);
725         str->di_ctime = cpu_to_be64(ip->i_inode.i_ctime.tv_sec);
726 
727         str->di_goal_meta = cpu_to_be64(ip->i_goal);
728         str->di_goal_data = cpu_to_be64(ip->i_goal);
729         str->di_generation = cpu_to_be64(ip->i_generation);
730 
731         str->di_flags = cpu_to_be32(ip->i_diskflags);
732         str->di_height = cpu_to_be16(ip->i_height);
733         str->di_payload_format = cpu_to_be32(S_ISDIR(ip->i_inode.i_mode) &&
734                                              !(ip->i_diskflags & GFS2_DIF_EXHASH) ?
735                                              GFS2_FORMAT_DE : 0);
736         str->di_depth = cpu_to_be16(ip->i_depth);
737         str->di_entries = cpu_to_be32(ip->i_entries);
738 
739         str->di_eattr = cpu_to_be64(ip->i_eattr);
740         str->di_atime_nsec = cpu_to_be32(ip->i_inode.i_atime.tv_nsec);
741         str->di_mtime_nsec = cpu_to_be32(ip->i_inode.i_mtime.tv_nsec);
742         str->di_ctime_nsec = cpu_to_be32(ip->i_inode.i_ctime.tv_nsec);
743 }
744 
745 /**
746  * gfs2_write_inode - Make sure the inode is stable on the disk
747  * @inode: The inode
748  * @wbc: The writeback control structure
749  *
750  * Returns: errno
751  */
752 
753 static int gfs2_write_inode(struct inode *inode, struct writeback_control *wbc)
754 {
755         struct gfs2_inode *ip = GFS2_I(inode);
756         struct gfs2_sbd *sdp = GFS2_SB(inode);
757         struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl);
758         struct backing_dev_info *bdi = inode_to_bdi(metamapping->host);
759         int ret = 0;
760         bool flush_all = (wbc->sync_mode == WB_SYNC_ALL || gfs2_is_jdata(ip));
761 
762         if (flush_all)
763                 gfs2_log_flush(GFS2_SB(inode), ip->i_gl,
764                                GFS2_LOG_HEAD_FLUSH_NORMAL |
765                                GFS2_LFC_WRITE_INODE);
766         if (bdi->wb.dirty_exceeded)
767                 gfs2_ail1_flush(sdp, wbc);
768         else
769                 filemap_fdatawrite(metamapping);
770         if (flush_all)
771                 ret = filemap_fdatawait(metamapping);
772         if (ret)
773                 mark_inode_dirty_sync(inode);
774         else {
775                 spin_lock(&inode->i_lock);
776                 if (!(inode->i_flags & I_DIRTY))
777                         gfs2_ordered_del_inode(ip);
778                 spin_unlock(&inode->i_lock);
779         }
780         return ret;
781 }
782 
783 /**
784  * gfs2_dirty_inode - check for atime updates
785  * @inode: The inode in question
786  * @flags: The type of dirty
787  *
788  * Unfortunately it can be called under any combination of inode
789  * glock and transaction lock, so we have to check carefully.
790  *
791  * At the moment this deals only with atime - it should be possible
792  * to expand that role in future, once a review of the locking has
793  * been carried out.
794  */
795 
796 static void gfs2_dirty_inode(struct inode *inode, int flags)
797 {
798         struct gfs2_inode *ip = GFS2_I(inode);
799         struct gfs2_sbd *sdp = GFS2_SB(inode);
800         struct buffer_head *bh;
801         struct gfs2_holder gh;
802         int need_unlock = 0;
803         int need_endtrans = 0;
804         int ret;
805 
806         if (!(flags & I_DIRTY_INODE))
807                 return;
808         if (unlikely(test_bit(SDF_WITHDRAWN, &sdp->sd_flags)))
809                 return;
810         if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
811                 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
812                 if (ret) {
813                         fs_err(sdp, "dirty_inode: glock %d\n", ret);
814                         return;
815                 }
816                 need_unlock = 1;
817         } else if (WARN_ON_ONCE(ip->i_gl->gl_state != LM_ST_EXCLUSIVE))
818                 return;
819 
820         if (current->journal_info == NULL) {
821                 ret = gfs2_trans_begin(sdp, RES_DINODE, 0);
822                 if (ret) {
823                         fs_err(sdp, "dirty_inode: gfs2_trans_begin %d\n", ret);
824                         goto out;
825                 }
826                 need_endtrans = 1;
827         }
828 
829         ret = gfs2_meta_inode_buffer(ip, &bh);
830         if (ret == 0) {
831                 gfs2_trans_add_meta(ip->i_gl, bh);
832                 gfs2_dinode_out(ip, bh->b_data);
833                 brelse(bh);
834         }
835 
836         if (need_endtrans)
837                 gfs2_trans_end(sdp);
838 out:
839         if (need_unlock)
840                 gfs2_glock_dq_uninit(&gh);
841 }
842 
843 /**
844  * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
845  * @sdp: the filesystem
846  *
847  * Returns: errno
848  */
849 
850 static int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
851 {
852         struct gfs2_holder freeze_gh;
853         int error;
854 
855         error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, GL_NOCACHE,
856                                    &freeze_gh);
857         if (error && !test_bit(SDF_WITHDRAWN, &sdp->sd_flags))
858                 return error;
859 
860         flush_workqueue(gfs2_delete_workqueue);
861         if (sdp->sd_quotad_process)
862                 kthread_stop(sdp->sd_quotad_process);
863         sdp->sd_quotad_process = NULL;
864         if (sdp->sd_logd_process)
865                 kthread_stop(sdp->sd_logd_process);
866         sdp->sd_logd_process = NULL;
867 
868         gfs2_quota_sync(sdp->sd_vfs, 0);
869         gfs2_statfs_sync(sdp->sd_vfs, 0);
870 
871         gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SHUTDOWN |
872                        GFS2_LFC_MAKE_FS_RO);
873         wait_event(sdp->sd_reserving_log_wait, atomic_read(&sdp->sd_reserving_log) == 0);
874         gfs2_assert_warn(sdp, atomic_read(&sdp->sd_log_blks_free) == sdp->sd_jdesc->jd_blocks);
875 
876         if (gfs2_holder_initialized(&freeze_gh))
877                 gfs2_glock_dq_uninit(&freeze_gh);
878 
879         gfs2_quota_cleanup(sdp);
880 
881         return error;
882 }
883 
884 /**
885  * gfs2_put_super - Unmount the filesystem
886  * @sb: The VFS superblock
887  *
888  */
889 
890 static void gfs2_put_super(struct super_block *sb)
891 {
892         struct gfs2_sbd *sdp = sb->s_fs_info;
893         int error;
894         struct gfs2_jdesc *jd;
895 
896         /* No more recovery requests */
897         set_bit(SDF_NORECOVERY, &sdp->sd_flags);
898         smp_mb();
899 
900         /* Wait on outstanding recovery */
901 restart:
902         spin_lock(&sdp->sd_jindex_spin);
903         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
904                 if (!test_bit(JDF_RECOVERY, &jd->jd_flags))
905                         continue;
906                 spin_unlock(&sdp->sd_jindex_spin);
907                 wait_on_bit(&jd->jd_flags, JDF_RECOVERY,
908                             TASK_UNINTERRUPTIBLE);
909                 goto restart;
910         }
911         spin_unlock(&sdp->sd_jindex_spin);
912 
913         if (!sb_rdonly(sb)) {
914                 error = gfs2_make_fs_ro(sdp);
915                 if (error)
916                         gfs2_io_error(sdp);
917         }
918         /*  At this point, we're through modifying the disk  */
919 
920         /*  Release stuff  */
921 
922         iput(sdp->sd_jindex);
923         iput(sdp->sd_statfs_inode);
924         iput(sdp->sd_rindex);
925         iput(sdp->sd_quota_inode);
926 
927         gfs2_glock_put(sdp->sd_rename_gl);
928         gfs2_glock_put(sdp->sd_freeze_gl);
929 
930         if (!sdp->sd_args.ar_spectator) {
931                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
932                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
933                 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
934                 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
935                 iput(sdp->sd_sc_inode);
936                 iput(sdp->sd_qc_inode);
937         }
938 
939         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
940         gfs2_clear_rgrpd(sdp);
941         gfs2_jindex_free(sdp);
942         /*  Take apart glock structures and buffer lists  */
943         gfs2_gl_hash_clear(sdp);
944         gfs2_delete_debugfs_file(sdp);
945         /*  Unmount the locking protocol  */
946         gfs2_lm_unmount(sdp);
947 
948         /*  At this point, we're through participating in the lockspace  */
949         gfs2_sys_fs_del(sdp);
950 }
951 
952 /**
953  * gfs2_sync_fs - sync the filesystem
954  * @sb: the superblock
955  *
956  * Flushes the log to disk.
957  */
958 
959 static int gfs2_sync_fs(struct super_block *sb, int wait)
960 {
961         struct gfs2_sbd *sdp = sb->s_fs_info;
962 
963         gfs2_quota_sync(sb, -1);
964         if (wait)
965                 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL |
966                                GFS2_LFC_SYNC_FS);
967         return sdp->sd_log_error;
968 }
969 
970 void gfs2_freeze_func(struct work_struct *work)
971 {
972         int error;
973         struct gfs2_holder freeze_gh;
974         struct gfs2_sbd *sdp = container_of(work, struct gfs2_sbd, sd_freeze_work);
975         struct super_block *sb = sdp->sd_vfs;
976 
977         atomic_inc(&sb->s_active);
978         error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, 0,
979                                    &freeze_gh);
980         if (error) {
981                 fs_info(sdp, "GFS2: couldn't get freeze lock : %d\n", error);
982                 gfs2_assert_withdraw(sdp, 0);
983         } else {
984                 atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN);
985                 error = thaw_super(sb);
986                 if (error) {
987                         fs_info(sdp, "GFS2: couldn't thaw filesystem: %d\n",
988                                 error);
989                         gfs2_assert_withdraw(sdp, 0);
990                 }
991                 if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))
992                         freeze_gh.gh_flags |= GL_NOCACHE;
993                 gfs2_glock_dq_uninit(&freeze_gh);
994         }
995         deactivate_super(sb);
996         clear_bit_unlock(SDF_FS_FROZEN, &sdp->sd_flags);
997         wake_up_bit(&sdp->sd_flags, SDF_FS_FROZEN);
998         return;
999 }
1000 
1001 /**
1002  * gfs2_freeze - prevent further writes to the filesystem
1003  * @sb: the VFS structure for the filesystem
1004  *
1005  */
1006 
1007 static int gfs2_freeze(struct super_block *sb)
1008 {
1009         struct gfs2_sbd *sdp = sb->s_fs_info;
1010         int error = 0;
1011 
1012         mutex_lock(&sdp->sd_freeze_mutex);
1013         if (atomic_read(&sdp->sd_freeze_state) != SFS_UNFROZEN)
1014                 goto out;
1015 
1016         if (test_bit(SDF_WITHDRAWN, &sdp->sd_flags)) {
1017                 error = -EINVAL;
1018                 goto out;
1019         }
1020 
1021         for (;;) {
1022                 error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh);
1023                 if (!error)
1024                         break;
1025 
1026                 if (error == -EBUSY)
1027                         fs_err(sdp, "waiting for recovery before freeze\n");
1028                 else
1029                         fs_err(sdp, "error freezing FS: %d\n", error);
1030 
1031                 fs_err(sdp, "retrying...\n");
1032                 msleep(1000);
1033         }
1034         set_bit(SDF_FS_FROZEN, &sdp->sd_flags);
1035 out:
1036         mutex_unlock(&sdp->sd_freeze_mutex);
1037         return error;
1038 }
1039 
1040 /**
1041  * gfs2_unfreeze - reallow writes to the filesystem
1042  * @sb: the VFS structure for the filesystem
1043  *
1044  */
1045 
1046 static int gfs2_unfreeze(struct super_block *sb)
1047 {
1048         struct gfs2_sbd *sdp = sb->s_fs_info;
1049 
1050         mutex_lock(&sdp->sd_freeze_mutex);
1051         if (atomic_read(&sdp->sd_freeze_state) != SFS_FROZEN ||
1052             !gfs2_holder_initialized(&sdp->sd_freeze_gh)) {
1053                 mutex_unlock(&sdp->sd_freeze_mutex);
1054                 return 0;
1055         }
1056 
1057         gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
1058         mutex_unlock(&sdp->sd_freeze_mutex);
1059         return wait_on_bit(&sdp->sd_flags, SDF_FS_FROZEN, TASK_INTERRUPTIBLE);
1060 }
1061 
1062 /**
1063  * statfs_fill - fill in the sg for a given RG
1064  * @rgd: the RG
1065  * @sc: the sc structure
1066  *
1067  * Returns: 0 on success, -ESTALE if the LVB is invalid
1068  */
1069 
1070 static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
1071                             struct gfs2_statfs_change_host *sc)
1072 {
1073         gfs2_rgrp_verify(rgd);
1074         sc->sc_total += rgd->rd_data;
1075         sc->sc_free += rgd->rd_free;
1076         sc->sc_dinodes += rgd->rd_dinodes;
1077         return 0;
1078 }
1079 
1080 /**
1081  * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
1082  * @sdp: the filesystem
1083  * @sc: the sc info that will be returned
1084  *
1085  * Any error (other than a signal) will cause this routine to fall back
1086  * to the synchronous version.
1087  *
1088  * FIXME: This really shouldn't busy wait like this.
1089  *
1090  * Returns: errno
1091  */
1092 
1093 static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
1094 {
1095         struct gfs2_rgrpd *rgd_next;
1096         struct gfs2_holder *gha, *gh;
1097         unsigned int slots = 64;
1098         unsigned int x;
1099         int done;
1100         int error = 0, err;
1101 
1102         memset(sc, 0, sizeof(struct gfs2_statfs_change_host));
1103         gha = kmalloc_array(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
1104         if (!gha)
1105                 return -ENOMEM;
1106         for (x = 0; x < slots; x++)
1107                 gfs2_holder_mark_uninitialized(gha + x);
1108 
1109         rgd_next = gfs2_rgrpd_get_first(sdp);
1110 
1111         for (;;) {
1112                 done = 1;
1113 
1114                 for (x = 0; x < slots; x++) {
1115                         gh = gha + x;
1116 
1117                         if (gfs2_holder_initialized(gh) && gfs2_glock_poll(gh)) {
1118                                 err = gfs2_glock_wait(gh);
1119                                 if (err) {
1120                                         gfs2_holder_uninit(gh);
1121                                         error = err;
1122                                 } else {
1123                                         if (!error) {
1124                                                 struct gfs2_rgrpd *rgd =
1125                                                         gfs2_glock2rgrp(gh->gh_gl);
1126 
1127                                                 error = statfs_slow_fill(rgd, sc);
1128                                         }
1129                                         gfs2_glock_dq_uninit(gh);
1130                                 }
1131                         }
1132 
1133                         if (gfs2_holder_initialized(gh))
1134                                 done = 0;
1135                         else if (rgd_next && !error) {
1136                                 error = gfs2_glock_nq_init(rgd_next->rd_gl,
1137                                                            LM_ST_SHARED,
1138                                                            GL_ASYNC,
1139                                                            gh);
1140                                 rgd_next = gfs2_rgrpd_get_next(rgd_next);
1141                                 done = 0;
1142                         }
1143 
1144                         if (signal_pending(current))
1145                                 error = -ERESTARTSYS;
1146                 }
1147 
1148                 if (done)
1149                         break;
1150 
1151                 yield();
1152         }
1153 
1154         kfree(gha);
1155         return error;
1156 }
1157 
1158 /**
1159  * gfs2_statfs_i - Do a statfs
1160  * @sdp: the filesystem
1161  * @sg: the sg structure
1162  *
1163  * Returns: errno
1164  */
1165 
1166 static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
1167 {
1168         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
1169         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
1170 
1171         spin_lock(&sdp->sd_statfs_spin);
1172 
1173         *sc = *m_sc;
1174         sc->sc_total += l_sc->sc_total;
1175         sc->sc_free += l_sc->sc_free;
1176         sc->sc_dinodes += l_sc->sc_dinodes;
1177 
1178         spin_unlock(&sdp->sd_statfs_spin);
1179 
1180         if (sc->sc_free < 0)
1181                 sc->sc_free = 0;
1182         if (sc->sc_free > sc->sc_total)
1183                 sc->sc_free = sc->sc_total;
1184         if (sc->sc_dinodes < 0)
1185                 sc->sc_dinodes = 0;
1186 
1187         return 0;
1188 }
1189 
1190 /**
1191  * gfs2_statfs - Gather and return stats about the filesystem
1192  * @sb: The superblock
1193  * @statfsbuf: The buffer
1194  *
1195  * Returns: 0 on success or error code
1196  */
1197 
1198 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1199 {
1200         struct super_block *sb = dentry->d_sb;
1201         struct gfs2_sbd *sdp = sb->s_fs_info;
1202         struct gfs2_statfs_change_host sc;
1203         int error;
1204 
1205         error = gfs2_rindex_update(sdp);
1206         if (error)
1207                 return error;
1208 
1209         if (gfs2_tune_get(sdp, gt_statfs_slow))
1210                 error = gfs2_statfs_slow(sdp, &sc);
1211         else
1212                 error = gfs2_statfs_i(sdp, &sc);
1213 
1214         if (error)
1215                 return error;
1216 
1217         buf->f_type = GFS2_MAGIC;
1218         buf->f_bsize = sdp->sd_sb.sb_bsize;
1219         buf->f_blocks = sc.sc_total;
1220         buf->f_bfree = sc.sc_free;
1221         buf->f_bavail = sc.sc_free;
1222         buf->f_files = sc.sc_dinodes + sc.sc_free;
1223         buf->f_ffree = sc.sc_free;
1224         buf->f_namelen = GFS2_FNAMESIZE;
1225 
1226         return 0;
1227 }
1228 
1229 /**
1230  * gfs2_remount_fs - called when the FS is remounted
1231  * @sb:  the filesystem
1232  * @flags:  the remount flags
1233  * @data:  extra data passed in (not used right now)
1234  *
1235  * Returns: errno
1236  */
1237 
1238 static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data)
1239 {
1240         struct gfs2_sbd *sdp = sb->s_fs_info;
1241         struct gfs2_args args = sdp->sd_args; /* Default to current settings */
1242         struct gfs2_tune *gt = &sdp->sd_tune;
1243         int error;
1244 
1245         sync_filesystem(sb);
1246 
1247         spin_lock(&gt->gt_spin);
1248         args.ar_commit = gt->gt_logd_secs;
1249         args.ar_quota_quantum = gt->gt_quota_quantum;
1250         if (gt->gt_statfs_slow)
1251                 args.ar_statfs_quantum = 0;
1252         else
1253                 args.ar_statfs_quantum = gt->gt_statfs_quantum;
1254         spin_unlock(&gt->gt_spin);
1255         error = gfs2_mount_args(&args, data);
1256         if (error)
1257                 return error;
1258 
1259         /* Not allowed to change locking details */
1260         if (strcmp(args.ar_lockproto, sdp->sd_args.ar_lockproto) ||
1261             strcmp(args.ar_locktable, sdp->sd_args.ar_locktable) ||
1262             strcmp(args.ar_hostdata, sdp->sd_args.ar_hostdata))
1263                 return -EINVAL;
1264 
1265         /* Some flags must not be changed */
1266         if (args_neq(&args, &sdp->sd_args, spectator) ||
1267             args_neq(&args, &sdp->sd_args, localflocks) ||
1268             args_neq(&args, &sdp->sd_args, meta))
1269                 return -EINVAL;
1270 
1271         if (sdp->sd_args.ar_spectator)
1272                 *flags |= SB_RDONLY;
1273 
1274         if ((sb->s_flags ^ *flags) & SB_RDONLY) {
1275                 if (*flags & SB_RDONLY)
1276                         error = gfs2_make_fs_ro(sdp);
1277                 else
1278                         error = gfs2_make_fs_rw(sdp);
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 error;
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         if (S_ISDIR(inode->i_mode) &&
1635             (ip->i_diskflags & GFS2_DIF_EXHASH)) {
1636                 error = gfs2_dir_exhash_dealloc(ip);
1637                 if (error)
1638                         goto out_unlock;
1639         }
1640 
1641         if (ip->i_eattr) {
1642                 error = gfs2_ea_dealloc(ip);
1643                 if (error)
1644                         goto out_unlock;
1645         }
1646 
1647         if (!gfs2_is_stuffed(ip)) {
1648                 error = gfs2_file_dealloc(ip);
1649                 if (error)
1650                         goto out_unlock;
1651         }
1652 
1653         /* We're about to clear the bitmap for the dinode, but as soon as we
1654            do, gfs2_create_inode can create another inode at the same block
1655            location and try to set gl_object again. We clear gl_object here so
1656            that subsequent inode creates don't see an old gl_object. */
1657         glock_clear_object(ip->i_gl, ip);
1658         error = gfs2_dinode_dealloc(ip);
1659         goto out_unlock;
1660 
1661 out_truncate:
1662         gfs2_log_flush(sdp, ip->i_gl, GFS2_LOG_HEAD_FLUSH_NORMAL |
1663                        GFS2_LFC_EVICT_INODE);
1664         metamapping = gfs2_glock2aspace(ip->i_gl);
1665         if (test_bit(GLF_DIRTY, &ip->i_gl->gl_flags)) {
1666                 filemap_fdatawrite(metamapping);
1667                 filemap_fdatawait(metamapping);
1668         }
1669         write_inode_now(inode, 1);
1670         gfs2_ail_flush(ip->i_gl, 0);
1671 
1672         error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
1673         if (error)
1674                 goto out_unlock;
1675         /* Needs to be done before glock release & also in a transaction */
1676         truncate_inode_pages(&inode->i_data, 0);
1677         truncate_inode_pages(metamapping, 0);
1678         gfs2_trans_end(sdp);
1679 
1680 out_unlock:
1681         if (gfs2_rs_active(&ip->i_res))
1682                 gfs2_rs_deltree(&ip->i_res);
1683 
1684         if (gfs2_holder_initialized(&ip->i_iopen_gh)) {
1685                 glock_clear_object(ip->i_iopen_gh.gh_gl, ip);
1686                 if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) {
1687                         ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1688                         gfs2_glock_dq(&ip->i_iopen_gh);
1689                 }
1690                 gfs2_holder_uninit(&ip->i_iopen_gh);
1691         }
1692         if (gfs2_holder_initialized(&gh)) {
1693                 glock_clear_object(ip->i_gl, ip);
1694                 gfs2_glock_dq_uninit(&gh);
1695         }
1696         if (error && error != GLR_TRYFAILED && error != -EROFS)
1697                 fs_warn(sdp, "gfs2_evict_inode: %d\n", error);
1698 out:
1699         truncate_inode_pages_final(&inode->i_data);
1700         gfs2_rsqa_delete(ip, NULL);
1701         gfs2_ordered_del_inode(ip);
1702         clear_inode(inode);
1703         gfs2_dir_hash_inval(ip);
1704         glock_clear_object(ip->i_gl, ip);
1705         wait_on_bit_io(&ip->i_flags, GIF_GLOP_PENDING, TASK_UNINTERRUPTIBLE);
1706         gfs2_glock_add_to_lru(ip->i_gl);
1707         gfs2_glock_put_eventually(ip->i_gl);
1708         ip->i_gl = NULL;
1709         if (gfs2_holder_initialized(&ip->i_iopen_gh)) {
1710                 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1711 
1712                 glock_clear_object(gl, ip);
1713                 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1714                 gfs2_glock_hold(gl);
1715                 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1716                 gfs2_glock_put_eventually(gl);
1717         }
1718 }
1719 
1720 static struct inode *gfs2_alloc_inode(struct super_block *sb)
1721 {
1722         struct gfs2_inode *ip;
1723 
1724         ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
1725         if (ip) {
1726                 ip->i_flags = 0;
1727                 ip->i_gl = NULL;
1728                 memset(&ip->i_res, 0, sizeof(ip->i_res));
1729                 RB_CLEAR_NODE(&ip->i_res.rs_node);
1730                 ip->i_rahead = 0;
1731         }
1732         return &ip->i_inode;
1733 }
1734 
1735 static void gfs2_free_inode(struct inode *inode)
1736 {
1737         kmem_cache_free(gfs2_inode_cachep, GFS2_I(inode));
1738 }
1739 
1740 const struct super_operations gfs2_super_ops = {
1741         .alloc_inode            = gfs2_alloc_inode,
1742         .free_inode             = gfs2_free_inode,
1743         .write_inode            = gfs2_write_inode,
1744         .dirty_inode            = gfs2_dirty_inode,
1745         .evict_inode            = gfs2_evict_inode,
1746         .put_super              = gfs2_put_super,
1747         .sync_fs                = gfs2_sync_fs,
1748         .freeze_super           = gfs2_freeze,
1749         .thaw_super             = gfs2_unfreeze,
1750         .statfs                 = gfs2_statfs,
1751         .remount_fs             = gfs2_remount_fs,
1752         .drop_inode             = gfs2_drop_inode,
1753         .show_options           = gfs2_show_options,
1754 };
1755 
1756 

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