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authorMike Snitzer <snitzer@redhat.com>2012-03-07 19:09:41 +0000
committerAlasdair G Kergon <agk@redhat.com>2012-03-07 19:09:41 +0000
commit1f3db25d8be4ac50b897b39609802183ea68a514 (patch)
treeb8e140111ba62062d309ae0dec90543f35e28172 /drivers/md/dm-thin-metadata.c
parent1212268fd9816e3b8801e57b896fceaec71969ad (diff)
downloadlinaro-lsk-1f3db25d8be4ac50b897b39609802183ea68a514.tar.gz
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>
Diffstat (limited to 'drivers/md/dm-thin-metadata.c')
-rw-r--r--drivers/md/dm-thin-metadata.c22
1 files changed, 17 insertions, 5 deletions
diff --git a/drivers/md/dm-thin-metadata.c b/drivers/md/dm-thin-metadata.c
index 59c4f0446ff..13d964636d5 100644
--- a/drivers/md/dm-thin-metadata.c
+++ b/drivers/md/dm-thin-metadata.c
@@ -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);