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dm thin metadata: remove incorrect close_device on creation error paths 

The __open_device() error paths in __create_thin() and __create_snap()
incorrectly call __close_device() even if td was not initialized by
__open_device().  Remove this.

Also document __open_device() return values, remove a redundant
td->changed = 1 in __create_thin(), and insert an additional
safeguard against creating an already-existing device.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@kernel.org
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Mike Snitzer 2012-03-07 19:09:41 +00:00 committed by Alasdair G Kergon
parent 1212268fd9
commit 1f3db25d8b
1 changed files with 17 additions and 5 deletions
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22
drivers/md/dm-thin-metadata.c
View File

@ -789,6 +789,11 @@ int dm_pool_metadata_close(struct dm_pool_metadata *pmd)
return 0;
}
/*
* __open_device: Returns @td corresponding to device with id @dev,
* creating it if @create is set and incrementing @td->open_count.
* On failure, @td is undefined.
*/
static int __open_device(struct dm_pool_metadata *pmd,
dm_thin_id dev, int create,
struct dm_thin_device **td)
@ -799,10 +804,16 @@ static int __open_device(struct dm_pool_metadata *pmd,
struct disk_device_details details_le;
/*
* Check the device isn't already open.
* If the device is already open, return it.
*/
list_for_each_entry(td2, &pmd->thin_devices, list)
if (td2->id == dev) {
/*
* May not create an already-open device.
*/
if (create)
return -EEXIST;
td2->open_count++;
*td = td2;
return 0;
@ -817,6 +828,9 @@ static int __open_device(struct dm_pool_metadata *pmd,
if (r != -ENODATA || !create)
return r;
/*
* Create new device.
*/
changed = 1;
details_le.mapped_blocks = 0;
details_le.transaction_id = cpu_to_le64(pmd->trans_id);
@ -882,12 +896,10 @@ static int __create_thin(struct dm_pool_metadata *pmd,
r = __open_device(pmd, dev, 1, &td);
if (r) {
__close_device(td);
dm_btree_remove(&pmd->tl_info, pmd->root, &key, &pmd->root);
dm_btree_del(&pmd->bl_info, dev_root);
return r;
}
td->changed = 1;
__close_device(td);
return r;
@ -967,14 +979,14 @@ static int __create_snap(struct dm_pool_metadata *pmd,
goto bad;
r = __set_snapshot_details(pmd, td, origin, pmd->time);
__close_device(td);
if (r)
goto bad;
__close_device(td);
return 0;
bad:
__close_device(td);
dm_btree_remove(&pmd->tl_info, pmd->root, &key, &pmd->root);
dm_btree_remove(&pmd->details_info, pmd->details_root,
&key, &pmd->details_root);