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authorDavid Teigland <teigland@redhat.com>2006-01-06 00:20:00 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-06 08:33:59 -0800
commit637842cfdbe2b981f7088f7633e630570f58efaf (patch)
tree05b64c2f30612ab126df9e3ba8448d62101341d2 /drivers/md/dm.c
parent9f708e40fe040e79f6c393a282f0701c9f8dc174 (diff)
[PATCH] device-mapper: add dm_find_md
Abstract dm_find_md() from dm_get_mdptr() to allow use elsewhere. 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.c')
-rw-r--r--drivers/md/dm.c19
1 files changed, 14 insertions, 5 deletions
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 930b9fc2795..27cd234cf68 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -902,10 +902,9 @@ int dm_create_with_minor(unsigned int minor, struct mapped_device **result)
return create_aux(minor, 1, result);
}
-void *dm_get_mdptr(dev_t dev)
+static struct mapped_device *dm_find_md(dev_t dev)
{
struct mapped_device *md;
- void *mdptr = NULL;
unsigned minor = MINOR(dev);
if (MAJOR(dev) != _major || minor >= (1 << MINORBITS))
@@ -914,12 +913,22 @@ void *dm_get_mdptr(dev_t dev)
down(&_minor_lock);
md = idr_find(&_minor_idr, minor);
-
- if (md && (dm_disk(md)->first_minor == minor))
- mdptr = md->interface_ptr;
+ if (!md || (dm_disk(md)->first_minor != minor))
+ md = NULL;
up(&_minor_lock);
+ return md;
+}
+
+void *dm_get_mdptr(dev_t dev)
+{
+ struct mapped_device *md;
+ void *mdptr = NULL;
+
+ md = dm_find_md(dev);
+ if (md)
+ mdptr = md->interface_ptr;
return mdptr;
}