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ocfs2: Stop orphan scan as early as possible during umount 

Currently if the orphan scan fires a tick before the user issues the umount,
the umount will wait for the queued orphan scan tasks to complete.

This patch makes the umount stop the orphan scan as early as possible so as
to reduce the probability of the queued tasks slowing down the umount.

Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
Signed-off-by: Joel Becker <joel.becker@oracle.com>
This commit is contained in:
Sunil Mushran 2009-06-19 16:53:17 -07:00 committed by Joel Becker
parent c3d38840ab
commit 692684e19e
3 changed files with 21 additions and 4 deletions
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14
fs/ocfs2/journal.c
View File

@ -1880,6 +1880,9 @@ void ocfs2_queue_orphan_scan(struct ocfs2_super *osb)
os = &osb->osb_orphan_scan;
if (atomic_read(&os->os_state) == ORPHAN_SCAN_INACTIVE)
goto out;
status = ocfs2_orphan_scan_lock(osb, &seqno, DLM_LOCK_EX);
if (status < 0) {
if (status != -EAGAIN)
@ -1887,6 +1890,10 @@ void ocfs2_queue_orphan_scan(struct ocfs2_super *osb)
goto out;
}
/* Do no queue the tasks if the volume is being umounted */
if (atomic_read(&os->os_state) == ORPHAN_SCAN_INACTIVE)
goto unlock;
if (os->os_seqno != seqno) {
os->os_seqno = seqno;
goto unlock;
@ -1920,8 +1927,9 @@ void ocfs2_orphan_scan_work(struct work_struct *work)
mutex_lock(&os->os_lock);
ocfs2_queue_orphan_scan(osb);
schedule_delayed_work(&os->os_orphan_scan_work,
ocfs2_orphan_scan_timeout());
if (atomic_read(&os->os_state) == ORPHAN_SCAN_ACTIVE)
schedule_delayed_work(&os->os_orphan_scan_work,
ocfs2_orphan_scan_timeout());
mutex_unlock(&os->os_lock);
}
@ -1930,6 +1938,7 @@ void ocfs2_orphan_scan_stop(struct ocfs2_super *osb)
struct ocfs2_orphan_scan *os;
os = &osb->osb_orphan_scan;
atomic_set(&os->os_state, ORPHAN_SCAN_INACTIVE);
mutex_lock(&os->os_lock);
cancel_delayed_work(&os->os_orphan_scan_work);
mutex_unlock(&os->os_lock);
@ -1940,6 +1949,7 @@ int ocfs2_orphan_scan_init(struct ocfs2_super *osb)
struct ocfs2_orphan_scan *os;
os = &osb->osb_orphan_scan;
atomic_set(&os->os_state, ORPHAN_SCAN_ACTIVE);
os->os_osb = osb;
os->os_count = 0;
os->os_scantime = CURRENT_TIME;

6
fs/ocfs2/ocfs2.h
View File

@ -154,6 +154,11 @@ struct ocfs2_lock_res {
#endif
};
enum ocfs2_orphan_scan_state {
ORPHAN_SCAN_ACTIVE,
ORPHAN_SCAN_INACTIVE
};
struct ocfs2_orphan_scan {
struct mutex os_lock;
struct ocfs2_super *os_osb;
@ -162,6 +167,7 @@ struct ocfs2_orphan_scan {
struct timespec os_scantime; /* time this node ran the scan */
u32 os_count; /* tracks node specific scans */
u32 os_seqno; /* tracks cluster wide scans */
atomic_t os_state; /* ACTIVE or INACTIVE */
};
struct ocfs2_dlm_debug {

5
fs/ocfs2/super.c
View File

@ -1814,14 +1814,15 @@ static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
debugfs_remove(osb->osb_ctxt);
/* Orphan scan should be stopped as early as possible */
ocfs2_orphan_scan_stop(osb);
ocfs2_disable_quotas(osb);
ocfs2_shutdown_local_alloc(osb);
ocfs2_truncate_log_shutdown(osb);
ocfs2_orphan_scan_stop(osb);
/* This will disable recovery and flush any recovery work. */
ocfs2_recovery_exit(osb);