2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
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.
10 #include <linux/bio.h>
11 #include <linux/sched.h>
12 #include <linux/slab.h>
13 #include <linux/spinlock.h>
14 #include <linux/completion.h>
15 #include <linux/buffer_head.h>
16 #include <linux/statfs.h>
17 #include <linux/seq_file.h>
18 #include <linux/mount.h>
19 #include <linux/kthread.h>
20 #include <linux/delay.h>
21 #include <linux/gfs2_ondisk.h>
22 #include <linux/crc32.h>
23 #include <linux/time.h>
24 #include <linux/wait.h>
25 #include <linux/writeback.h>
45 #define args_neq(a1, a2, x) ((a1)->ar_##x != (a2)->ar_##x)
83 static const match_table_t tokens = {
84 {Opt_lockproto, "lockproto=%s"},
85 {Opt_locktable, "locktable=%s"},
86 {Opt_hostdata, "hostdata=%s"},
87 {Opt_spectator, "spectator"},
88 {Opt_ignore_local_fs, "ignore_local_fs"},
89 {Opt_localflocks, "localflocks"},
90 {Opt_localcaching, "localcaching"},
92 {Opt_nodebug, "nodebug"},
93 {Opt_upgrade, "upgrade"},
96 {Opt_quota_off, "quota=off"},
97 {Opt_quota_account, "quota=account"},
98 {Opt_quota_on, "quota=on"},
100 {Opt_noquota, "noquota"},
101 {Opt_suiddir, "suiddir"},
102 {Opt_nosuiddir, "nosuiddir"},
103 {Opt_data_writeback, "data=writeback"},
104 {Opt_data_ordered, "data=ordered"},
106 {Opt_discard, "discard"},
107 {Opt_nodiscard, "nodiscard"},
108 {Opt_commit, "commit=%d"},
109 {Opt_err_withdraw, "errors=withdraw"},
110 {Opt_err_panic, "errors=panic"},
111 {Opt_statfs_quantum, "statfs_quantum=%d"},
112 {Opt_statfs_percent, "statfs_percent=%d"},
113 {Opt_quota_quantum, "quota_quantum=%d"},
114 {Opt_barrier, "barrier"},
115 {Opt_nobarrier, "nobarrier"},
120 * gfs2_mount_args - Parse mount options
121 * @args: The structure into which the parsed options will be written
122 * @options: The options to parse
127 int gfs2_mount_args(struct gfs2_args *args, char *options)
131 substring_t tmp[MAX_OPT_ARGS];
134 /* Split the options into tokens with the "," character and
138 o = strsep(&options, ",");
144 token = match_token(o, tokens, tmp);
147 match_strlcpy(args->ar_lockproto, &tmp[0],
151 match_strlcpy(args->ar_locktable, &tmp[0],
155 match_strlcpy(args->ar_hostdata, &tmp[0],
159 args->ar_spectator = 1;
161 case Opt_ignore_local_fs:
162 args->ar_ignore_local_fs = 1;
164 case Opt_localflocks:
165 args->ar_localflocks = 1;
167 case Opt_localcaching:
168 args->ar_localcaching = 1;
171 if (args->ar_errors == GFS2_ERRORS_PANIC) {
172 printk(KERN_WARNING "GFS2: -o debug and -o errors=panic "
173 "are mutually exclusive.\n");
182 args->ar_upgrade = 1;
185 args->ar_posix_acl = 1;
188 args->ar_posix_acl = 0;
192 args->ar_quota = GFS2_QUOTA_OFF;
194 case Opt_quota_account:
195 args->ar_quota = GFS2_QUOTA_ACCOUNT;
199 args->ar_quota = GFS2_QUOTA_ON;
202 args->ar_suiddir = 1;
205 args->ar_suiddir = 0;
207 case Opt_data_writeback:
208 args->ar_data = GFS2_DATA_WRITEBACK;
210 case Opt_data_ordered:
211 args->ar_data = GFS2_DATA_ORDERED;
217 args->ar_discard = 1;
220 args->ar_discard = 0;
223 rv = match_int(&tmp[0], &args->ar_commit);
224 if (rv || args->ar_commit <= 0) {
225 printk(KERN_WARNING "GFS2: commit mount option requires a positive numeric argument\n");
226 return rv ? rv : -EINVAL;
229 case Opt_statfs_quantum:
230 rv = match_int(&tmp[0], &args->ar_statfs_quantum);
231 if (rv || args->ar_statfs_quantum < 0) {
232 printk(KERN_WARNING "GFS2: statfs_quantum mount option requires a non-negative numeric argument\n");
233 return rv ? rv : -EINVAL;
236 case Opt_quota_quantum:
237 rv = match_int(&tmp[0], &args->ar_quota_quantum);
238 if (rv || args->ar_quota_quantum <= 0) {
239 printk(KERN_WARNING "GFS2: quota_quantum mount option requires a positive numeric argument\n");
240 return rv ? rv : -EINVAL;
243 case Opt_statfs_percent:
244 rv = match_int(&tmp[0], &args->ar_statfs_percent);
245 if (rv || args->ar_statfs_percent < 0 ||
246 args->ar_statfs_percent > 100) {
247 printk(KERN_WARNING "statfs_percent mount option requires a numeric argument between 0 and 100\n");
248 return rv ? rv : -EINVAL;
251 case Opt_err_withdraw:
252 args->ar_errors = GFS2_ERRORS_WITHDRAW;
255 if (args->ar_debug) {
256 printk(KERN_WARNING "GFS2: -o debug and -o errors=panic "
257 "are mutually exclusive.\n");
260 args->ar_errors = GFS2_ERRORS_PANIC;
263 args->ar_nobarrier = 0;
266 args->ar_nobarrier = 1;
270 printk(KERN_WARNING "GFS2: invalid mount option: %s\n", o);
279 * gfs2_jindex_free - Clear all the journal index information
280 * @sdp: The GFS2 superblock
284 void gfs2_jindex_free(struct gfs2_sbd *sdp)
286 struct list_head list, *head;
287 struct gfs2_jdesc *jd;
288 struct gfs2_journal_extent *jext;
290 spin_lock(&sdp->sd_jindex_spin);
291 list_add(&list, &sdp->sd_jindex_list);
292 list_del_init(&sdp->sd_jindex_list);
293 sdp->sd_journals = 0;
294 spin_unlock(&sdp->sd_jindex_spin);
296 while (!list_empty(&list)) {
297 jd = list_entry(list.next, struct gfs2_jdesc, jd_list);
298 head = &jd->extent_list;
299 while (!list_empty(head)) {
300 jext = list_entry(head->next,
301 struct gfs2_journal_extent,
303 list_del(&jext->extent_list);
306 list_del(&jd->jd_list);
312 static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid)
314 struct gfs2_jdesc *jd;
317 list_for_each_entry(jd, head, jd_list) {
318 if (jd->jd_jid == jid) {
330 struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid)
332 struct gfs2_jdesc *jd;
334 spin_lock(&sdp->sd_jindex_spin);
335 jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
336 spin_unlock(&sdp->sd_jindex_spin);
341 int gfs2_jdesc_check(struct gfs2_jdesc *jd)
343 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
344 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
348 if (ip->i_disksize < (8 << 20) || ip->i_disksize > (1 << 30) ||
349 (ip->i_disksize & (sdp->sd_sb.sb_bsize - 1))) {
350 gfs2_consist_inode(ip);
353 jd->jd_blocks = ip->i_disksize >> sdp->sd_sb.sb_bsize_shift;
355 error = gfs2_write_alloc_required(ip, 0, ip->i_disksize, &ar);
357 gfs2_consist_inode(ip);
365 * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
366 * @sdp: the filesystem
371 int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
373 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
374 struct gfs2_glock *j_gl = ip->i_gl;
375 struct gfs2_holder t_gh;
376 struct gfs2_log_header_host head;
379 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &t_gh);
383 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
385 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
389 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
395 /* Initialize some head of the log stuff */
396 sdp->sd_log_sequence = head.lh_sequence + 1;
397 gfs2_log_pointers_init(sdp, head.lh_blkno);
399 error = gfs2_quota_init(sdp);
403 set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
405 gfs2_glock_dq_uninit(&t_gh);
410 t_gh.gh_flags |= GL_NOCACHE;
411 gfs2_glock_dq_uninit(&t_gh);
416 void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf)
418 const struct gfs2_statfs_change *str = buf;
420 sc->sc_total = be64_to_cpu(str->sc_total);
421 sc->sc_free = be64_to_cpu(str->sc_free);
422 sc->sc_dinodes = be64_to_cpu(str->sc_dinodes);
425 static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf)
427 struct gfs2_statfs_change *str = buf;
429 str->sc_total = cpu_to_be64(sc->sc_total);
430 str->sc_free = cpu_to_be64(sc->sc_free);
431 str->sc_dinodes = cpu_to_be64(sc->sc_dinodes);
434 int gfs2_statfs_init(struct gfs2_sbd *sdp)
436 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
437 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
438 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
439 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
440 struct buffer_head *m_bh, *l_bh;
441 struct gfs2_holder gh;
444 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
449 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
453 if (sdp->sd_args.ar_spectator) {
454 spin_lock(&sdp->sd_statfs_spin);
455 gfs2_statfs_change_in(m_sc, m_bh->b_data +
456 sizeof(struct gfs2_dinode));
457 spin_unlock(&sdp->sd_statfs_spin);
459 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
463 spin_lock(&sdp->sd_statfs_spin);
464 gfs2_statfs_change_in(m_sc, m_bh->b_data +
465 sizeof(struct gfs2_dinode));
466 gfs2_statfs_change_in(l_sc, l_bh->b_data +
467 sizeof(struct gfs2_dinode));
468 spin_unlock(&sdp->sd_statfs_spin);
476 gfs2_glock_dq_uninit(&gh);
480 void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free,
483 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
484 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
485 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
486 struct buffer_head *l_bh;
491 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
495 gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
497 spin_lock(&sdp->sd_statfs_spin);
498 l_sc->sc_total += total;
499 l_sc->sc_free += free;
500 l_sc->sc_dinodes += dinodes;
501 gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode));
502 if (sdp->sd_args.ar_statfs_percent) {
503 x = 100 * l_sc->sc_free;
504 y = m_sc->sc_free * sdp->sd_args.ar_statfs_percent;
505 if (x >= y || x <= -y)
508 spin_unlock(&sdp->sd_statfs_spin);
512 gfs2_wake_up_statfs(sdp);
515 void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh,
516 struct buffer_head *l_bh)
518 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
519 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
520 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
521 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
523 gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
525 spin_lock(&sdp->sd_statfs_spin);
526 m_sc->sc_total += l_sc->sc_total;
527 m_sc->sc_free += l_sc->sc_free;
528 m_sc->sc_dinodes += l_sc->sc_dinodes;
529 memset(l_sc, 0, sizeof(struct gfs2_statfs_change));
530 memset(l_bh->b_data + sizeof(struct gfs2_dinode),
531 0, sizeof(struct gfs2_statfs_change));
532 spin_unlock(&sdp->sd_statfs_spin);
534 gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
535 gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
538 int gfs2_statfs_sync(struct super_block *sb, int type)
540 struct gfs2_sbd *sdp = sb->s_fs_info;
541 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
542 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
543 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
544 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
545 struct gfs2_holder gh;
546 struct buffer_head *m_bh, *l_bh;
549 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
554 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
558 spin_lock(&sdp->sd_statfs_spin);
559 gfs2_statfs_change_in(m_sc, m_bh->b_data +
560 sizeof(struct gfs2_dinode));
561 if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) {
562 spin_unlock(&sdp->sd_statfs_spin);
565 spin_unlock(&sdp->sd_statfs_spin);
567 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
571 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
575 update_statfs(sdp, m_bh, l_bh);
576 sdp->sd_statfs_force_sync = 0;
585 gfs2_glock_dq_uninit(&gh);
590 struct list_head list;
591 struct gfs2_holder gh;
595 * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
597 * @sdp: the file system
598 * @state: the state to put the transaction lock into
599 * @t_gh: the hold on the transaction lock
604 static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp,
605 struct gfs2_holder *t_gh)
607 struct gfs2_inode *ip;
608 struct gfs2_jdesc *jd;
611 struct gfs2_log_header_host lh;
614 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
615 lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
620 ip = GFS2_I(jd->jd_inode);
621 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh);
626 list_add(&lfcc->list, &list);
629 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_DEFERRED,
632 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
633 error = gfs2_jdesc_check(jd);
636 error = gfs2_find_jhead(jd, &lh);
639 if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
646 gfs2_glock_dq_uninit(t_gh);
649 while (!list_empty(&list)) {
650 lfcc = list_entry(list.next, struct lfcc, list);
651 list_del(&lfcc->list);
652 gfs2_glock_dq_uninit(&lfcc->gh);
659 * gfs2_freeze_fs - freezes the file system
660 * @sdp: the file system
662 * This function flushes data and meta data for all machines by
663 * aquiring the transaction log exclusively. All journals are
664 * ensured to be in a clean state as well.
669 int gfs2_freeze_fs(struct gfs2_sbd *sdp)
673 mutex_lock(&sdp->sd_freeze_lock);
675 if (!sdp->sd_freeze_count++) {
676 error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh);
678 sdp->sd_freeze_count--;
681 mutex_unlock(&sdp->sd_freeze_lock);
687 * gfs2_unfreeze_fs - unfreezes the file system
688 * @sdp: the file system
690 * This function allows the file system to proceed by unlocking
691 * the exclusively held transaction lock. Other GFS2 nodes are
692 * now free to acquire the lock shared and go on with their lives.
696 void gfs2_unfreeze_fs(struct gfs2_sbd *sdp)
698 mutex_lock(&sdp->sd_freeze_lock);
700 if (sdp->sd_freeze_count && !--sdp->sd_freeze_count)
701 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
703 mutex_unlock(&sdp->sd_freeze_lock);
708 * gfs2_write_inode - Make sure the inode is stable on the disk
710 * @sync: synchronous write flag
715 static int gfs2_write_inode(struct inode *inode, struct writeback_control *wbc)
717 struct gfs2_inode *ip = GFS2_I(inode);
718 struct gfs2_sbd *sdp = GFS2_SB(inode);
719 struct gfs2_holder gh;
720 struct buffer_head *bh;
721 struct timespec atime;
722 struct gfs2_dinode *di;
725 /* Check this is a "normal" inode, etc */
726 if (current->flags & PF_MEMALLOC)
728 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
731 ret = gfs2_trans_begin(sdp, RES_DINODE, 0);
734 ret = gfs2_meta_inode_buffer(ip, &bh);
736 di = (struct gfs2_dinode *)bh->b_data;
737 atime.tv_sec = be64_to_cpu(di->di_atime);
738 atime.tv_nsec = be32_to_cpu(di->di_atime_nsec);
739 if (timespec_compare(&inode->i_atime, &atime) > 0) {
740 gfs2_trans_add_bh(ip->i_gl, bh, 1);
741 gfs2_dinode_out(ip, bh->b_data);
747 gfs2_glock_dq_uninit(&gh);
749 if (wbc->sync_mode == WB_SYNC_ALL)
750 gfs2_log_flush(GFS2_SB(inode), ip->i_gl);
755 * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
756 * @sdp: the filesystem
761 static int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
763 struct gfs2_holder t_gh;
766 flush_workqueue(gfs2_delete_workqueue);
767 gfs2_quota_sync(sdp->sd_vfs, 0, 1);
768 gfs2_statfs_sync(sdp->sd_vfs, 0);
770 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, GL_NOCACHE,
772 if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
775 gfs2_meta_syncfs(sdp);
776 gfs2_log_shutdown(sdp);
778 clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
781 gfs2_glock_dq_uninit(&t_gh);
783 gfs2_quota_cleanup(sdp);
788 static int gfs2_umount_recovery_wait(void *word)
795 * gfs2_put_super - Unmount the filesystem
796 * @sb: The VFS superblock
800 static void gfs2_put_super(struct super_block *sb)
802 struct gfs2_sbd *sdp = sb->s_fs_info;
804 struct gfs2_jdesc *jd;
806 /* Unfreeze the filesystem, if we need to */
808 mutex_lock(&sdp->sd_freeze_lock);
809 if (sdp->sd_freeze_count)
810 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
811 mutex_unlock(&sdp->sd_freeze_lock);
813 /* No more recovery requests */
814 set_bit(SDF_NORECOVERY, &sdp->sd_flags);
817 /* Wait on outstanding recovery */
819 spin_lock(&sdp->sd_jindex_spin);
820 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
821 if (!test_bit(JDF_RECOVERY, &jd->jd_flags))
823 spin_unlock(&sdp->sd_jindex_spin);
824 wait_on_bit(&jd->jd_flags, JDF_RECOVERY,
825 gfs2_umount_recovery_wait, TASK_UNINTERRUPTIBLE);
828 spin_unlock(&sdp->sd_jindex_spin);
830 kthread_stop(sdp->sd_quotad_process);
831 kthread_stop(sdp->sd_logd_process);
833 if (!(sb->s_flags & MS_RDONLY)) {
834 error = gfs2_make_fs_ro(sdp);
838 /* At this point, we're through modifying the disk */
842 iput(sdp->sd_jindex);
843 iput(sdp->sd_statfs_inode);
844 iput(sdp->sd_rindex);
845 iput(sdp->sd_quota_inode);
847 gfs2_glock_put(sdp->sd_rename_gl);
848 gfs2_glock_put(sdp->sd_trans_gl);
850 if (!sdp->sd_args.ar_spectator) {
851 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
852 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
853 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
854 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
855 iput(sdp->sd_sc_inode);
856 iput(sdp->sd_qc_inode);
859 gfs2_glock_dq_uninit(&sdp->sd_live_gh);
860 gfs2_clear_rgrpd(sdp);
861 gfs2_jindex_free(sdp);
862 /* Take apart glock structures and buffer lists */
863 invalidate_inodes(sdp->sd_vfs);
864 gfs2_gl_hash_clear(sdp);
865 /* Unmount the locking protocol */
866 gfs2_lm_unmount(sdp);
868 /* At this point, we're through participating in the lockspace */
869 gfs2_sys_fs_del(sdp);
873 * gfs2_sync_fs - sync the filesystem
874 * @sb: the superblock
876 * Flushes the log to disk.
879 static int gfs2_sync_fs(struct super_block *sb, int wait)
881 if (wait && sb->s_fs_info)
882 gfs2_log_flush(sb->s_fs_info, NULL);
887 * gfs2_freeze - prevent further writes to the filesystem
888 * @sb: the VFS structure for the filesystem
892 static int gfs2_freeze(struct super_block *sb)
894 struct gfs2_sbd *sdp = sb->s_fs_info;
897 if (test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
901 error = gfs2_freeze_fs(sdp);
907 fs_err(sdp, "waiting for recovery before freeze\n");
911 fs_err(sdp, "error freezing FS: %d\n", error);
915 fs_err(sdp, "retrying...\n");
922 * gfs2_unfreeze - reallow writes to the filesystem
923 * @sb: the VFS structure for the filesystem
927 static int gfs2_unfreeze(struct super_block *sb)
929 gfs2_unfreeze_fs(sb->s_fs_info);
934 * statfs_fill - fill in the sg for a given RG
936 * @sc: the sc structure
938 * Returns: 0 on success, -ESTALE if the LVB is invalid
941 static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
942 struct gfs2_statfs_change_host *sc)
944 gfs2_rgrp_verify(rgd);
945 sc->sc_total += rgd->rd_data;
946 sc->sc_free += rgd->rd_free;
947 sc->sc_dinodes += rgd->rd_dinodes;
952 * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
953 * @sdp: the filesystem
954 * @sc: the sc info that will be returned
956 * Any error (other than a signal) will cause this routine to fall back
957 * to the synchronous version.
959 * FIXME: This really shouldn't busy wait like this.
964 static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
966 struct gfs2_holder ri_gh;
967 struct gfs2_rgrpd *rgd_next;
968 struct gfs2_holder *gha, *gh;
969 unsigned int slots = 64;
974 memset(sc, 0, sizeof(struct gfs2_statfs_change_host));
975 gha = kcalloc(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
979 error = gfs2_rindex_hold(sdp, &ri_gh);
983 rgd_next = gfs2_rgrpd_get_first(sdp);
988 for (x = 0; x < slots; x++) {
991 if (gh->gh_gl && gfs2_glock_poll(gh)) {
992 err = gfs2_glock_wait(gh);
994 gfs2_holder_uninit(gh);
998 error = statfs_slow_fill(
999 gh->gh_gl->gl_object, sc);
1000 gfs2_glock_dq_uninit(gh);
1006 else if (rgd_next && !error) {
1007 error = gfs2_glock_nq_init(rgd_next->rd_gl,
1011 rgd_next = gfs2_rgrpd_get_next(rgd_next);
1015 if (signal_pending(current))
1016 error = -ERESTARTSYS;
1025 gfs2_glock_dq_uninit(&ri_gh);
1033 * gfs2_statfs_i - Do a statfs
1034 * @sdp: the filesystem
1035 * @sg: the sg structure
1040 static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
1042 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
1043 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
1045 spin_lock(&sdp->sd_statfs_spin);
1048 sc->sc_total += l_sc->sc_total;
1049 sc->sc_free += l_sc->sc_free;
1050 sc->sc_dinodes += l_sc->sc_dinodes;
1052 spin_unlock(&sdp->sd_statfs_spin);
1054 if (sc->sc_free < 0)
1056 if (sc->sc_free > sc->sc_total)
1057 sc->sc_free = sc->sc_total;
1058 if (sc->sc_dinodes < 0)
1065 * gfs2_statfs - Gather and return stats about the filesystem
1066 * @sb: The superblock
1067 * @statfsbuf: The buffer
1069 * Returns: 0 on success or error code
1072 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1074 struct super_block *sb = dentry->d_inode->i_sb;
1075 struct gfs2_sbd *sdp = sb->s_fs_info;
1076 struct gfs2_statfs_change_host sc;
1079 if (gfs2_tune_get(sdp, gt_statfs_slow))
1080 error = gfs2_statfs_slow(sdp, &sc);
1082 error = gfs2_statfs_i(sdp, &sc);
1087 buf->f_type = GFS2_MAGIC;
1088 buf->f_bsize = sdp->sd_sb.sb_bsize;
1089 buf->f_blocks = sc.sc_total;
1090 buf->f_bfree = sc.sc_free;
1091 buf->f_bavail = sc.sc_free;
1092 buf->f_files = sc.sc_dinodes + sc.sc_free;
1093 buf->f_ffree = sc.sc_free;
1094 buf->f_namelen = GFS2_FNAMESIZE;
1100 * gfs2_remount_fs - called when the FS is remounted
1101 * @sb: the filesystem
1102 * @flags: the remount flags
1103 * @data: extra data passed in (not used right now)
1108 static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data)
1110 struct gfs2_sbd *sdp = sb->s_fs_info;
1111 struct gfs2_args args = sdp->sd_args; /* Default to current settings */
1112 struct gfs2_tune *gt = &sdp->sd_tune;
1115 spin_lock(>->gt_spin);
1116 args.ar_commit = gt->gt_log_flush_secs;
1117 args.ar_quota_quantum = gt->gt_quota_quantum;
1118 if (gt->gt_statfs_slow)
1119 args.ar_statfs_quantum = 0;
1121 args.ar_statfs_quantum = gt->gt_statfs_quantum;
1122 spin_unlock(>->gt_spin);
1123 error = gfs2_mount_args(&args, data);
1127 /* Not allowed to change locking details */
1128 if (strcmp(args.ar_lockproto, sdp->sd_args.ar_lockproto) ||
1129 strcmp(args.ar_locktable, sdp->sd_args.ar_locktable) ||
1130 strcmp(args.ar_hostdata, sdp->sd_args.ar_hostdata))
1133 /* Some flags must not be changed */
1134 if (args_neq(&args, &sdp->sd_args, spectator) ||
1135 args_neq(&args, &sdp->sd_args, ignore_local_fs) ||
1136 args_neq(&args, &sdp->sd_args, localflocks) ||
1137 args_neq(&args, &sdp->sd_args, localcaching) ||
1138 args_neq(&args, &sdp->sd_args, meta))
1141 if (sdp->sd_args.ar_spectator)
1142 *flags |= MS_RDONLY;
1144 if ((sb->s_flags ^ *flags) & MS_RDONLY) {
1145 if (*flags & MS_RDONLY)
1146 error = gfs2_make_fs_ro(sdp);
1148 error = gfs2_make_fs_rw(sdp);
1153 sdp->sd_args = args;
1154 if (sdp->sd_args.ar_posix_acl)
1155 sb->s_flags |= MS_POSIXACL;
1157 sb->s_flags &= ~MS_POSIXACL;
1158 if (sdp->sd_args.ar_nobarrier)
1159 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1161 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1162 spin_lock(>->gt_spin);
1163 gt->gt_log_flush_secs = args.ar_commit;
1164 gt->gt_quota_quantum = args.ar_quota_quantum;
1165 if (args.ar_statfs_quantum) {
1166 gt->gt_statfs_slow = 0;
1167 gt->gt_statfs_quantum = args.ar_statfs_quantum;
1170 gt->gt_statfs_slow = 1;
1171 gt->gt_statfs_quantum = 30;
1173 spin_unlock(>->gt_spin);
1175 gfs2_online_uevent(sdp);
1180 * gfs2_drop_inode - Drop an inode (test for remote unlink)
1181 * @inode: The inode to drop
1183 * If we've received a callback on an iopen lock then its because a
1184 * remote node tried to deallocate the inode but failed due to this node
1185 * still having the inode open. Here we mark the link count zero
1186 * since we know that it must have reached zero if the GLF_DEMOTE flag
1187 * is set on the iopen glock. If we didn't do a disk read since the
1188 * remote node removed the final link then we might otherwise miss
1189 * this event. This check ensures that this node will deallocate the
1190 * inode's blocks, or alternatively pass the baton on to another
1191 * node for later deallocation.
1194 static void gfs2_drop_inode(struct inode *inode)
1196 struct gfs2_inode *ip = GFS2_I(inode);
1198 if (inode->i_nlink) {
1199 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1200 if (gl && test_bit(GLF_DEMOTE, &gl->gl_flags))
1203 generic_drop_inode(inode);
1207 * gfs2_clear_inode - Deallocate an inode when VFS is done with it
1208 * @inode: The VFS inode
1212 static void gfs2_clear_inode(struct inode *inode)
1214 struct gfs2_inode *ip = GFS2_I(inode);
1216 ip->i_gl->gl_object = NULL;
1217 gfs2_glock_put(ip->i_gl);
1219 if (ip->i_iopen_gh.gh_gl) {
1220 ip->i_iopen_gh.gh_gl->gl_object = NULL;
1221 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1225 static int is_ancestor(const struct dentry *d1, const struct dentry *d2)
1231 } while (!IS_ROOT(d1));
1236 * gfs2_show_options - Show mount options for /proc/mounts
1237 * @s: seq_file structure
1240 * Returns: 0 on success or error code
1243 static int gfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
1245 struct gfs2_sbd *sdp = mnt->mnt_sb->s_fs_info;
1246 struct gfs2_args *args = &sdp->sd_args;
1249 if (is_ancestor(mnt->mnt_root, sdp->sd_master_dir))
1250 seq_printf(s, ",meta");
1251 if (args->ar_lockproto[0])
1252 seq_printf(s, ",lockproto=%s", args->ar_lockproto);
1253 if (args->ar_locktable[0])
1254 seq_printf(s, ",locktable=%s", args->ar_locktable);
1255 if (args->ar_hostdata[0])
1256 seq_printf(s, ",hostdata=%s", args->ar_hostdata);
1257 if (args->ar_spectator)
1258 seq_printf(s, ",spectator");
1259 if (args->ar_ignore_local_fs)
1260 seq_printf(s, ",ignore_local_fs");
1261 if (args->ar_localflocks)
1262 seq_printf(s, ",localflocks");
1263 if (args->ar_localcaching)
1264 seq_printf(s, ",localcaching");
1266 seq_printf(s, ",debug");
1267 if (args->ar_upgrade)
1268 seq_printf(s, ",upgrade");
1269 if (args->ar_posix_acl)
1270 seq_printf(s, ",acl");
1271 if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
1273 switch (args->ar_quota) {
1274 case GFS2_QUOTA_OFF:
1277 case GFS2_QUOTA_ACCOUNT:
1287 seq_printf(s, ",quota=%s", state);
1289 if (args->ar_suiddir)
1290 seq_printf(s, ",suiddir");
1291 if (args->ar_data != GFS2_DATA_DEFAULT) {
1293 switch (args->ar_data) {
1294 case GFS2_DATA_WRITEBACK:
1295 state = "writeback";
1297 case GFS2_DATA_ORDERED:
1304 seq_printf(s, ",data=%s", state);
1306 if (args->ar_discard)
1307 seq_printf(s, ",discard");
1308 val = sdp->sd_tune.gt_log_flush_secs;
1310 seq_printf(s, ",commit=%d", val);
1311 val = sdp->sd_tune.gt_statfs_quantum;
1313 seq_printf(s, ",statfs_quantum=%d", val);
1314 val = sdp->sd_tune.gt_quota_quantum;
1316 seq_printf(s, ",quota_quantum=%d", val);
1317 if (args->ar_statfs_percent)
1318 seq_printf(s, ",statfs_percent=%d", args->ar_statfs_percent);
1319 if (args->ar_errors != GFS2_ERRORS_DEFAULT) {
1322 switch (args->ar_errors) {
1323 case GFS2_ERRORS_WITHDRAW:
1326 case GFS2_ERRORS_PANIC:
1333 seq_printf(s, ",errors=%s", state);
1335 if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags))
1336 seq_printf(s, ",nobarrier");
1342 * We have to (at the moment) hold the inodes main lock to cover
1343 * the gap between unlocking the shared lock on the iopen lock and
1344 * taking the exclusive lock. I'd rather do a shared -> exclusive
1345 * conversion on the iopen lock, but we can change that later. This
1346 * is safe, just less efficient.
1349 static void gfs2_delete_inode(struct inode *inode)
1351 struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
1352 struct gfs2_inode *ip = GFS2_I(inode);
1353 struct gfs2_holder gh;
1356 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1357 if (unlikely(error)) {
1358 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1362 error = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED);
1366 gfs2_glock_dq_wait(&ip->i_iopen_gh);
1367 gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, &ip->i_iopen_gh);
1368 error = gfs2_glock_nq(&ip->i_iopen_gh);
1372 if (S_ISDIR(inode->i_mode) &&
1373 (ip->i_diskflags & GFS2_DIF_EXHASH)) {
1374 error = gfs2_dir_exhash_dealloc(ip);
1380 error = gfs2_ea_dealloc(ip);
1385 if (!gfs2_is_stuffed(ip)) {
1386 error = gfs2_file_dealloc(ip);
1391 error = gfs2_dinode_dealloc(ip);
1396 error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
1399 /* Needs to be done before glock release & also in a transaction */
1400 truncate_inode_pages(&inode->i_data, 0);
1401 gfs2_trans_end(sdp);
1404 if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags))
1405 gfs2_glock_dq(&ip->i_iopen_gh);
1406 gfs2_holder_uninit(&ip->i_iopen_gh);
1407 gfs2_glock_dq_uninit(&gh);
1408 if (error && error != GLR_TRYFAILED && error != -EROFS)
1409 fs_warn(sdp, "gfs2_delete_inode: %d\n", error);
1411 truncate_inode_pages(&inode->i_data, 0);
1415 static struct inode *gfs2_alloc_inode(struct super_block *sb)
1417 struct gfs2_inode *ip;
1419 ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
1424 return &ip->i_inode;
1427 static void gfs2_destroy_inode(struct inode *inode)
1429 kmem_cache_free(gfs2_inode_cachep, inode);
1432 const struct super_operations gfs2_super_ops = {
1433 .alloc_inode = gfs2_alloc_inode,
1434 .destroy_inode = gfs2_destroy_inode,
1435 .write_inode = gfs2_write_inode,
1436 .delete_inode = gfs2_delete_inode,
1437 .put_super = gfs2_put_super,
1438 .sync_fs = gfs2_sync_fs,
1439 .freeze_fs = gfs2_freeze,
1440 .unfreeze_fs = gfs2_unfreeze,
1441 .statfs = gfs2_statfs,
1442 .remount_fs = gfs2_remount_fs,
1443 .clear_inode = gfs2_clear_inode,
1444 .drop_inode = gfs2_drop_inode,
1445 .show_options = gfs2_show_options,