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authorAlasdair G Kergon <agk@redhat.com>2005-07-12 15:53:05 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2005-07-12 16:19:11 -0700
commitd5e404c10a98fc2979643476851e9cbdb1944812 (patch)
tree1d7d846b43a6a8a022e5cf4fd5453b27abf0de94
parent93c534aefb906824d71ea779ed0c7f1573843f4e (diff)
downloadlinux-2.6.34-ux500-d5e404c10a98fc2979643476851e9cbdb1944812.tar.gz
[PATCH] device-mapper snapshots: Handle origin extension
Handle writes to a snapshot-origin device that has been extended since the snapshot was taken. 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>
-rw-r--r--drivers/md/dm-snap.c4
-rw-r--r--drivers/md/dm-table.c1
2 files changed, 5 insertions, 0 deletions
diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c
index 594d1f6b478..ab54f99b7c3 100644
--- a/drivers/md/dm-snap.c
+++ b/drivers/md/dm-snap.c
@@ -931,6 +931,10 @@ static int __origin_write(struct list_head *snapshots, struct bio *bio)
if (!snap->valid)
continue;
+ /* Nothing to do if writing beyond end of snapshot */
+ if (bio->bi_sector >= dm_table_get_size(snap->table))
+ continue;
+
down_write(&snap->lock);
/*
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 18e9b9953fc..a5a4c0ed8a1 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -943,6 +943,7 @@ EXPORT_SYMBOL(dm_vcalloc);
EXPORT_SYMBOL(dm_get_device);
EXPORT_SYMBOL(dm_put_device);
EXPORT_SYMBOL(dm_table_event);
+EXPORT_SYMBOL(dm_table_get_size);
EXPORT_SYMBOL(dm_table_get_mode);
EXPORT_SYMBOL(dm_table_put);
EXPORT_SYMBOL(dm_table_get);