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authorArtem Bityutskiy <artem.bityutskiy@linux.intel.com>2012-06-01 17:18:08 +0300
committerAl Viro <viro@zeniv.linux.org.uk>2012-06-01 10:37:36 -0400
commit033369d1af1264abc23bea2e174aa47cdd212f6f (patch)
treeb00e709d1e9270b1708488da7a596a8dff72541d /fs/reiserfs/super.c
parent5c5fd81962271d4ee2984837fef4ec37e689aa41 (diff)
downloadop-kernel-dev-033369d1af1264abc23bea2e174aa47cdd212f6f.zip
op-kernel-dev-033369d1af1264abc23bea2e174aa47cdd212f6f.tar.gz
reiserfs: get rid of resierfs_sync_super
This patch stops reiserfs using the VFS 'write_super()' method along with the s_dirt flag, because they are on their way out. The whole "superblock write-out" VFS infrastructure is served by the 'sync_supers()' kernel thread, which wakes up every 5 (by default) seconds and writes out all dirty superblock using the '->write_super()' call-back. But the problem with this thread is that it wastes power by waking up the system every 5 seconds, even if there are no diry superblocks, or there are no client file-systems which would need this (e.g., btrfs does not use '->write_super()'). So we want to kill it completely and thus, we need to make file-systems to stop using the '->write_super()' VFS service, and then remove it together with the kernel thread. Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/reiserfs/super.c')
-rw-r--r--fs/reiserfs/super.c54
1 files changed, 45 insertions, 9 deletions
diff --git a/fs/reiserfs/super.c b/fs/reiserfs/super.c
index 60cddb7..651ce76 100644
--- a/fs/reiserfs/super.c
+++ b/fs/reiserfs/super.c
@@ -72,20 +72,58 @@ static int reiserfs_sync_fs(struct super_block *s, int wait)
if (!journal_begin(&th, s, 1))
if (!journal_end_sync(&th, s, 1))
reiserfs_flush_old_commits(s);
- s->s_dirt = 0; /* Even if it's not true.
- * We'll loop forever in sync_supers otherwise */
reiserfs_write_unlock(s);
return 0;
}
-static void reiserfs_write_super(struct super_block *s)
+static void flush_old_commits(struct work_struct *work)
{
+ struct reiserfs_sb_info *sbi;
+ struct super_block *s;
+
+ sbi = container_of(work, struct reiserfs_sb_info, old_work.work);
+ s = sbi->s_journal->j_work_sb;
+
+ spin_lock(&sbi->old_work_lock);
+ sbi->work_queued = 0;
+ spin_unlock(&sbi->old_work_lock);
+
reiserfs_sync_fs(s, 1);
}
+void reiserfs_schedule_old_flush(struct super_block *s)
+{
+ struct reiserfs_sb_info *sbi = REISERFS_SB(s);
+ unsigned long delay;
+
+ if (s->s_flags & MS_RDONLY)
+ return;
+
+ spin_lock(&sbi->old_work_lock);
+ if (!sbi->work_queued) {
+ delay = msecs_to_jiffies(dirty_writeback_interval * 10);
+ queue_delayed_work(system_long_wq, &sbi->old_work, delay);
+ sbi->work_queued = 1;
+ }
+ spin_unlock(&sbi->old_work_lock);
+}
+
+static void cancel_old_flush(struct super_block *s)
+{
+ struct reiserfs_sb_info *sbi = REISERFS_SB(s);
+
+ cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
+ spin_lock(&sbi->old_work_lock);
+ sbi->work_queued = 0;
+ spin_unlock(&sbi->old_work_lock);
+}
+
static int reiserfs_freeze(struct super_block *s)
{
struct reiserfs_transaction_handle th;
+
+ cancel_old_flush(s);
+
reiserfs_write_lock(s);
if (!(s->s_flags & MS_RDONLY)) {
int err = journal_begin(&th, s, 1);
@@ -99,7 +137,6 @@ static int reiserfs_freeze(struct super_block *s)
journal_end_sync(&th, s, 1);
}
}
- s->s_dirt = 0;
reiserfs_write_unlock(s);
return 0;
}
@@ -483,9 +520,6 @@ static void reiserfs_put_super(struct super_block *s)
reiserfs_write_lock(s);
- if (s->s_dirt)
- reiserfs_write_super(s);
-
/* change file system state to current state if it was mounted with read-write permissions */
if (!(s->s_flags & MS_RDONLY)) {
if (!journal_begin(&th, s, 10)) {
@@ -692,7 +726,6 @@ static const struct super_operations reiserfs_sops = {
.dirty_inode = reiserfs_dirty_inode,
.evict_inode = reiserfs_evict_inode,
.put_super = reiserfs_put_super,
- .write_super = reiserfs_write_super,
.sync_fs = reiserfs_sync_fs,
.freeze_fs = reiserfs_freeze,
.unfreeze_fs = reiserfs_unfreeze,
@@ -1400,7 +1433,6 @@ static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
err = journal_end(&th, s, 10);
if (err)
goto out_err;
- s->s_dirt = 0;
if (!(*mount_flags & MS_RDONLY)) {
dquot_resume(s, -1);
@@ -1741,6 +1773,8 @@ static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
/* setup default block allocator options */
reiserfs_init_alloc_options(s);
+ spin_lock_init(&sbi->old_work_lock);
+ INIT_DELAYED_WORK(&sbi->old_work, flush_old_commits);
mutex_init(&sbi->lock);
sbi->lock_depth = -1;
@@ -2003,6 +2037,8 @@ error_unlocked:
reiserfs_write_unlock(s);
}
+ cancel_delayed_work_sync(&REISERFS_SB(s)->old_work);
+
reiserfs_free_bitmap_cache(s);
if (SB_BUFFER_WITH_SB(s))
brelse(SB_BUFFER_WITH_SB(s));
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