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| author | Mike Snitzer <snitzer@redhat.com> | 2012-03-07 20:09:41 +0100 |
|---|---|---|
| committer | Alasdair G Kergon <agk@redhat.com> | 2012-03-07 20:09:41 +0100 |
| commit | 1f3db25d8be4ac50b897b39609802183ea68a514 (patch) | |
| tree | b8e140111ba62062d309ae0dec90543f35e28172 /drivers/md/dm-thin-metadata.c | |
| parent | dm flakey: fix crash on read when corrupt_bio_byte not set (diff) | |
| download | linux-1f3db25d8be4ac50b897b39609802183ea68a514.tar.xz linux-1f3db25d8be4ac50b897b39609802183ea68a514.zip | |
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 '')
| -rw-r--r-- | drivers/md/dm-thin-metadata.c | 22 |
1 files changed, 17 insertions, 5 deletions
diff --git a/drivers/md/dm-thin-metadata.c b/drivers/md/dm-thin-metadata.c index 59c4f0446ffa..13d964636d57 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); |