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[PATCH] device-mapper: add dm_get_md 

Add dm_get_dev() to get a mapped device given its dev_t.

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>
hifive-unleashed-5.1
David Teigland 2006-01-06 00:20:01 -08:00 committed by Linus Torvalds
parent 637842cfdb
commit d229a9589f
2 changed files with 11 additions and 0 deletions
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10
drivers/md/dm.c
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@ -921,6 +921,16 @@ static struct mapped_device *dm_find_md(dev_t dev)
return md;
}
struct mapped_device *dm_get_md(dev_t dev)
{
struct mapped_device *md = dm_find_md(dev);
if (md)
dm_get(md);
return md;
}
void *dm_get_mdptr(dev_t dev)
{
struct mapped_device *md;

1
drivers/md/dm.h
View File

@ -58,6 +58,7 @@ int dm_create(struct mapped_device **md);
int dm_create_with_minor(unsigned int minor, struct mapped_device **md);
void dm_set_mdptr(struct mapped_device *md, void *ptr);
void *dm_get_mdptr(dev_t dev);
struct mapped_device *dm_get_md(dev_t dev);
/*
* Reference counting for md.