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| author | Alasdair G Kergon <agk@redhat.com> | 2006-01-06 00:20:02 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-01-06 08:34:00 -0800 |
| commit | 2d38fe204461dc542bb38f2b01a9cd115b367b36 (patch) | |
| tree | 3a8267a1ed308a6ae67f89ddc90ca44370b79371 /drivers/md/dm-snap.c | |
| parent | 81f1777a55e8c631b61e5fa5980fb7a2004287af (diff) | |
| download | linux-3.10-2d38fe204461dc542bb38f2b01a9cd115b367b36.tar.gz linux-3.10-2d38fe204461dc542bb38f2b01a9cd115b367b36.tar.bz2 linux-3.10-2d38fe204461dc542bb38f2b01a9cd115b367b36.zip | |
[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.c | 25 |
1 files changed, 15 insertions, 10 deletions
diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c index ab54f99b7c3..4b9dd8fb1e5 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, |