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authorAlasdair G Kergon <agk@redhat.com>2006-01-06 00:20:02 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-06 08:34:00 -0800
commit2d38fe204461dc542bb38f2b01a9cd115b367b36 (patch)
tree3a8267a1ed308a6ae67f89ddc90ca44370b79371 /drivers/md/dm-snap.c
parent81f1777a55e8c631b61e5fa5980fb7a2004287af (diff)
downloadop-kernel-dev-2d38fe204461dc542bb38f2b01a9cd115b367b36.zip
op-kernel-dev-2d38fe204461dc542bb38f2b01a9cd115b367b36.tar.gz
[PATCH] device-mapper snapshot: metadata reading separation
More snapshot metadata reading into separate function, to prepare for changing the place it gets called from. Signed-off-by: Alasdair G Kergon <agk@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.c')
-rw-r--r--drivers/md/dm-snap.c25
1 files changed, 15 insertions, 10 deletions
diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c
index ab54f99..4b9dd8f 100644
--- a/drivers/md/dm-snap.c
+++ b/drivers/md/dm-snap.c
@@ -371,6 +371,20 @@ static inline ulong round_up(ulong n, ulong size)
return (n + size) & ~size;
}
+static void read_snapshot_metadata(struct dm_snapshot *s)
+{
+ if (s->have_metadata)
+ return;
+
+ if (s->store.read_metadata(&s->store)) {
+ down_write(&s->lock);
+ s->valid = 0;
+ up_write(&s->lock);
+ }
+
+ s->have_metadata = 1;
+}
+
/*
* Construct a snapshot mapping: <origin_dev> <COW-dev> <p/n> <chunk-size>
*/
@@ -848,16 +862,7 @@ static void snapshot_resume(struct dm_target *ti)
{
struct dm_snapshot *s = (struct dm_snapshot *) ti->private;
- if (s->have_metadata)
- return;
-
- if (s->store.read_metadata(&s->store)) {
- down_write(&s->lock);
- s->valid = 0;
- up_write(&s->lock);
- }
-
- s->have_metadata = 1;
+ read_snapshot_metadata(s);
}
static int snapshot_status(struct dm_target *ti, status_type_t type,
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