2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2008 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/sched.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/lm_interface.h>
23 #include <linux/time.h>
44 * gfs2_write_inode - Make sure the inode is stable on the disk
46 * @sync: synchronous write flag
51 static int gfs2_write_inode(struct inode *inode, int sync)
53 struct gfs2_inode *ip = GFS2_I(inode);
54 struct gfs2_sbd *sdp = GFS2_SB(inode);
55 struct gfs2_holder gh;
56 struct buffer_head *bh;
57 struct timespec atime;
58 struct gfs2_dinode *di;
61 /* Check this is a "normal" inode, etc */
62 if (!test_bit(GIF_USER, &ip->i_flags) ||
63 (current->flags & PF_MEMALLOC))
65 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
68 ret = gfs2_trans_begin(sdp, RES_DINODE, 0);
71 ret = gfs2_meta_inode_buffer(ip, &bh);
73 di = (struct gfs2_dinode *)bh->b_data;
74 atime.tv_sec = be64_to_cpu(di->di_atime);
75 atime.tv_nsec = be32_to_cpu(di->di_atime_nsec);
76 if (timespec_compare(&inode->i_atime, &atime) > 0) {
77 gfs2_trans_add_bh(ip->i_gl, bh, 1);
78 gfs2_dinode_out(ip, bh->b_data);
84 gfs2_glock_dq_uninit(&gh);
87 gfs2_log_flush(GFS2_SB(inode), ip->i_gl);
92 * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
93 * @sdp: the filesystem
98 static int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
100 struct gfs2_holder t_gh;
103 gfs2_quota_sync(sdp);
104 gfs2_statfs_sync(sdp);
106 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, GL_NOCACHE,
108 if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
111 gfs2_meta_syncfs(sdp);
112 gfs2_log_shutdown(sdp);
114 clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
117 gfs2_glock_dq_uninit(&t_gh);
119 gfs2_quota_cleanup(sdp);
125 * gfs2_put_super - Unmount the filesystem
126 * @sb: The VFS superblock
130 static void gfs2_put_super(struct super_block *sb)
132 struct gfs2_sbd *sdp = sb->s_fs_info;
135 /* Unfreeze the filesystem, if we need to */
137 mutex_lock(&sdp->sd_freeze_lock);
138 if (sdp->sd_freeze_count)
139 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
140 mutex_unlock(&sdp->sd_freeze_lock);
142 kthread_stop(sdp->sd_quotad_process);
143 kthread_stop(sdp->sd_logd_process);
144 kthread_stop(sdp->sd_recoverd_process);
146 if (!(sb->s_flags & MS_RDONLY)) {
147 error = gfs2_make_fs_ro(sdp);
151 /* At this point, we're through modifying the disk */
155 iput(sdp->sd_jindex);
156 iput(sdp->sd_inum_inode);
157 iput(sdp->sd_statfs_inode);
158 iput(sdp->sd_rindex);
159 iput(sdp->sd_quota_inode);
161 gfs2_glock_put(sdp->sd_rename_gl);
162 gfs2_glock_put(sdp->sd_trans_gl);
164 if (!sdp->sd_args.ar_spectator) {
165 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
166 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
167 gfs2_glock_dq_uninit(&sdp->sd_ir_gh);
168 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
169 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
170 iput(sdp->sd_ir_inode);
171 iput(sdp->sd_sc_inode);
172 iput(sdp->sd_qc_inode);
175 gfs2_glock_dq_uninit(&sdp->sd_live_gh);
176 gfs2_clear_rgrpd(sdp);
177 gfs2_jindex_free(sdp);
178 /* Take apart glock structures and buffer lists */
179 gfs2_gl_hash_clear(sdp);
180 /* Unmount the locking protocol */
181 gfs2_lm_unmount(sdp);
183 /* At this point, we're through participating in the lockspace */
184 gfs2_sys_fs_del(sdp);
190 * @sb: the superblock
194 static void gfs2_write_super(struct super_block *sb)
200 * gfs2_sync_fs - sync the filesystem
201 * @sb: the superblock
203 * Flushes the log to disk.
206 static int gfs2_sync_fs(struct super_block *sb, int wait)
209 if (wait && sb->s_fs_info)
210 gfs2_log_flush(sb->s_fs_info, NULL);
215 * gfs2_write_super_lockfs - prevent further writes to the filesystem
216 * @sb: the VFS structure for the filesystem
220 static void gfs2_write_super_lockfs(struct super_block *sb)
222 struct gfs2_sbd *sdp = sb->s_fs_info;
225 if (test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
229 error = gfs2_freeze_fs(sdp);
235 fs_err(sdp, "waiting for recovery before freeze\n");
239 fs_err(sdp, "error freezing FS: %d\n", error);
243 fs_err(sdp, "retrying...\n");
249 * gfs2_unlockfs - reallow writes to the filesystem
250 * @sb: the VFS structure for the filesystem
254 static void gfs2_unlockfs(struct super_block *sb)
256 gfs2_unfreeze_fs(sb->s_fs_info);
260 * gfs2_statfs - Gather and return stats about the filesystem
261 * @sb: The superblock
262 * @statfsbuf: The buffer
264 * Returns: 0 on success or error code
267 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
269 struct super_block *sb = dentry->d_inode->i_sb;
270 struct gfs2_sbd *sdp = sb->s_fs_info;
271 struct gfs2_statfs_change_host sc;
274 if (gfs2_tune_get(sdp, gt_statfs_slow))
275 error = gfs2_statfs_slow(sdp, &sc);
277 error = gfs2_statfs_i(sdp, &sc);
282 buf->f_type = GFS2_MAGIC;
283 buf->f_bsize = sdp->sd_sb.sb_bsize;
284 buf->f_blocks = sc.sc_total;
285 buf->f_bfree = sc.sc_free;
286 buf->f_bavail = sc.sc_free;
287 buf->f_files = sc.sc_dinodes + sc.sc_free;
288 buf->f_ffree = sc.sc_free;
289 buf->f_namelen = GFS2_FNAMESIZE;
295 * gfs2_remount_fs - called when the FS is remounted
296 * @sb: the filesystem
297 * @flags: the remount flags
298 * @data: extra data passed in (not used right now)
303 static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data)
305 struct gfs2_sbd *sdp = sb->s_fs_info;
308 error = gfs2_mount_args(sdp, data, 1);
312 if (sdp->sd_args.ar_spectator)
315 if (*flags & MS_RDONLY) {
316 if (!(sb->s_flags & MS_RDONLY))
317 error = gfs2_make_fs_ro(sdp);
318 } else if (!(*flags & MS_RDONLY) &&
319 (sb->s_flags & MS_RDONLY)) {
320 error = gfs2_make_fs_rw(sdp);
328 * gfs2_drop_inode - Drop an inode (test for remote unlink)
329 * @inode: The inode to drop
331 * If we've received a callback on an iopen lock then its because a
332 * remote node tried to deallocate the inode but failed due to this node
333 * still having the inode open. Here we mark the link count zero
334 * since we know that it must have reached zero if the GLF_DEMOTE flag
335 * is set on the iopen glock. If we didn't do a disk read since the
336 * remote node removed the final link then we might otherwise miss
337 * this event. This check ensures that this node will deallocate the
338 * inode's blocks, or alternatively pass the baton on to another
339 * node for later deallocation.
342 static void gfs2_drop_inode(struct inode *inode)
344 struct gfs2_inode *ip = GFS2_I(inode);
346 if (test_bit(GIF_USER, &ip->i_flags) && inode->i_nlink) {
347 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
348 if (gl && test_bit(GLF_DEMOTE, &gl->gl_flags))
351 generic_drop_inode(inode);
355 * gfs2_clear_inode - Deallocate an inode when VFS is done with it
356 * @inode: The VFS inode
360 static void gfs2_clear_inode(struct inode *inode)
362 struct gfs2_inode *ip = GFS2_I(inode);
364 /* This tells us its a "real" inode and not one which only
365 * serves to contain an address space (see rgrp.c, meta_io.c)
366 * which therefore doesn't have its own glocks.
368 if (test_bit(GIF_USER, &ip->i_flags)) {
369 ip->i_gl->gl_object = NULL;
370 gfs2_glock_put(ip->i_gl);
372 if (ip->i_iopen_gh.gh_gl) {
373 ip->i_iopen_gh.gh_gl->gl_object = NULL;
374 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
379 static int is_ancestor(const struct dentry *d1, const struct dentry *d2)
385 } while (!IS_ROOT(d1));
390 * gfs2_show_options - Show mount options for /proc/mounts
391 * @s: seq_file structure
394 * Returns: 0 on success or error code
397 static int gfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
399 struct gfs2_sbd *sdp = mnt->mnt_sb->s_fs_info;
400 struct gfs2_args *args = &sdp->sd_args;
402 if (is_ancestor(mnt->mnt_root, sdp->sd_master_dir))
403 seq_printf(s, ",meta");
404 if (args->ar_lockproto[0])
405 seq_printf(s, ",lockproto=%s", args->ar_lockproto);
406 if (args->ar_locktable[0])
407 seq_printf(s, ",locktable=%s", args->ar_locktable);
408 if (args->ar_hostdata[0])
409 seq_printf(s, ",hostdata=%s", args->ar_hostdata);
410 if (args->ar_spectator)
411 seq_printf(s, ",spectator");
412 if (args->ar_ignore_local_fs)
413 seq_printf(s, ",ignore_local_fs");
414 if (args->ar_localflocks)
415 seq_printf(s, ",localflocks");
416 if (args->ar_localcaching)
417 seq_printf(s, ",localcaching");
419 seq_printf(s, ",debug");
420 if (args->ar_upgrade)
421 seq_printf(s, ",upgrade");
422 if (args->ar_posix_acl)
423 seq_printf(s, ",acl");
424 if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
426 switch (args->ar_quota) {
430 case GFS2_QUOTA_ACCOUNT:
440 seq_printf(s, ",quota=%s", state);
442 if (args->ar_suiddir)
443 seq_printf(s, ",suiddir");
444 if (args->ar_data != GFS2_DATA_DEFAULT) {
446 switch (args->ar_data) {
447 case GFS2_DATA_WRITEBACK:
450 case GFS2_DATA_ORDERED:
457 seq_printf(s, ",data=%s", state);
464 * We have to (at the moment) hold the inodes main lock to cover
465 * the gap between unlocking the shared lock on the iopen lock and
466 * taking the exclusive lock. I'd rather do a shared -> exclusive
467 * conversion on the iopen lock, but we can change that later. This
468 * is safe, just less efficient.
471 static void gfs2_delete_inode(struct inode *inode)
473 struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
474 struct gfs2_inode *ip = GFS2_I(inode);
475 struct gfs2_holder gh;
478 if (!test_bit(GIF_USER, &ip->i_flags))
481 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
482 if (unlikely(error)) {
483 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
487 gfs2_glock_dq_wait(&ip->i_iopen_gh);
488 gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, &ip->i_iopen_gh);
489 error = gfs2_glock_nq(&ip->i_iopen_gh);
493 if (S_ISDIR(inode->i_mode) &&
494 (ip->i_diskflags & GFS2_DIF_EXHASH)) {
495 error = gfs2_dir_exhash_dealloc(ip);
501 error = gfs2_ea_dealloc(ip);
506 if (!gfs2_is_stuffed(ip)) {
507 error = gfs2_file_dealloc(ip);
512 error = gfs2_dinode_dealloc(ip);
517 error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
520 /* Needs to be done before glock release & also in a transaction */
521 truncate_inode_pages(&inode->i_data, 0);
525 if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags))
526 gfs2_glock_dq(&ip->i_iopen_gh);
527 gfs2_holder_uninit(&ip->i_iopen_gh);
528 gfs2_glock_dq_uninit(&gh);
529 if (error && error != GLR_TRYFAILED)
530 fs_warn(sdp, "gfs2_delete_inode: %d\n", error);
532 truncate_inode_pages(&inode->i_data, 0);
536 static struct inode *gfs2_alloc_inode(struct super_block *sb)
538 struct gfs2_inode *ip;
540 ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
548 static void gfs2_destroy_inode(struct inode *inode)
550 kmem_cache_free(gfs2_inode_cachep, inode);
553 const struct super_operations gfs2_super_ops = {
554 .alloc_inode = gfs2_alloc_inode,
555 .destroy_inode = gfs2_destroy_inode,
556 .write_inode = gfs2_write_inode,
557 .delete_inode = gfs2_delete_inode,
558 .put_super = gfs2_put_super,
559 .write_super = gfs2_write_super,
560 .sync_fs = gfs2_sync_fs,
561 .write_super_lockfs = gfs2_write_super_lockfs,
562 .unlockfs = gfs2_unlockfs,
563 .statfs = gfs2_statfs,
564 .remount_fs = gfs2_remount_fs,
565 .clear_inode = gfs2_clear_inode,
566 .drop_inode = gfs2_drop_inode,
567 .show_options = gfs2_show_options,