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dm: add dm_deleting_md function 

Add dm_deleting_md to check whether or not a given mapped
device is currently being deleted.

Signed-off-by: Mike Anderson <andmike@linux.vnet.ibm.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Mike Anderson 2009-12-10 23:52:20 +00:00 committed by Alasdair G Kergon
parent 6df400ab64
commit 432a212c0d
2 changed files with 12 additions and 2 deletions
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9
drivers/md/dm.c
View File

@ -329,6 +329,11 @@ static void __exit dm_exit(void)
/*
* Block device functions
*/
int dm_deleting_md(struct mapped_device *md)
{
return test_bit(DMF_DELETING, &md->flags);
}
static int dm_blk_open(struct block_device *bdev, fmode_t mode)
{
struct mapped_device *md;
@ -340,7 +345,7 @@ static int dm_blk_open(struct block_device *bdev, fmode_t mode)
goto out;
if (test_bit(DMF_FREEING, &md->flags) ||
test_bit(DMF_DELETING, &md->flags)) {
dm_deleting_md(md)) {
md = NULL;
goto out;
}
@ -2659,7 +2664,7 @@ struct mapped_device *dm_get_from_kobject(struct kobject *kobj)
return NULL;
if (test_bit(DMF_FREEING, &md->flags) ||
test_bit(DMF_DELETING, &md->flags))
dm_deleting_md(md))
return NULL;
dm_get(md);

5
drivers/md/dm.h
View File

@ -88,6 +88,11 @@ int dm_target_iterate(void (*iter_func)(struct target_type *tt,
int dm_split_args(int *argc, char ***argvp, char *input);
/*
* Is this mapped_device being deleted?
*/
int dm_deleting_md(struct mapped_device *md);
/*
* The device-mapper can be driven through one of two interfaces;
* ioctl or filesystem, depending which patch you have applied.