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[PATCH] device-mapper: add dm_find_md

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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>
This commit is contained in:
David Teigland 2006-01-06 00:20:00 -08:00 committed by Linus Torvalds
parent 9f708e40fe
commit 637842cfdb
1 changed files with 14 additions and 5 deletions
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19
drivers/md/dm.c
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@ -902,10 +902,9 @@ int dm_create_with_minor(unsigned int minor, struct mapped_device **result)
return create_aux(minor, 1, 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; struct mapped_device *md;
void *mdptr = NULL;
unsigned minor = MINOR(dev); unsigned minor = MINOR(dev);
if (MAJOR(dev) != _major || minor >= (1 << MINORBITS)) if (MAJOR(dev) != _major || minor >= (1 << MINORBITS))
@ -914,12 +913,22 @@ void *dm_get_mdptr(dev_t dev)
down(&_minor_lock); down(&_minor_lock);
md = idr_find(&_minor_idr, minor); md = idr_find(&_minor_idr, minor);
if (!md || (dm_disk(md)->first_minor != minor))
if (md && (dm_disk(md)->first_minor == minor)) md = NULL;
mdptr = md->interface_ptr;
up(&_minor_lock); 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; return mdptr;
} }