diff options
| author | Alasdair G Kergon <agk@redhat.com> | 2006-10-03 01:15:30 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-10-03 08:04:14 -0700 |
| commit | ca3a931fd33b841cbcc5932f8eac7c43e0909242 (patch) | |
| tree | bc8aa7ace1a5e528cbfabc01b17a2016c55bc448 /drivers/md/dm-snap.h | |
| parent | 9d493fa8c943ed4ec6e42b7ebfd8f0b7657d54f8 (diff) | |
[PATCH] dm snapshot: add workqueue
Add a workqueue so that I/O can be queued up to be flushed from a separate
thread (e.g. if local interrupts are disabled).
A new per-snapshot spinlock pe_lock is introduced to protect queued_bios.
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/md/dm-snap.h')
| -rw-r--r-- | drivers/md/dm-snap.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/md/dm-snap.h b/drivers/md/dm-snap.h index 221eb8880c8..15fa2ae6cdc 100644 --- a/drivers/md/dm-snap.h +++ b/drivers/md/dm-snap.h @@ -10,7 +10,9 @@ #define DM_SNAPSHOT_H #include "dm.h" +#include "dm-bio-list.h" #include <linux/blkdev.h> +#include <linux/workqueue.h> struct exception_table { uint32_t hash_mask; @@ -112,10 +114,20 @@ struct dm_snapshot { struct exception_table pending; struct exception_table complete; + /* + * pe_lock protects all pending_exception operations and access + * as well as the snapshot_bios list. + */ + spinlock_t pe_lock; + /* The on disk metadata handler */ struct exception_store store; struct kcopyd_client *kcopyd_client; + + /* Queue of snapshot writes for ksnapd to flush */ + struct bio_list queued_bios; + struct work_struct queued_bios_work; }; /* |