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authorJie Liu <jeff.liu@oracle.com>2013-11-20 16:08:53 +0800
committerJiri Slaby <jslaby@suse.cz>2014-07-04 10:06:58 +0200
commit0af3f13634228f13b0298551326a51b89d95a7e4 (patch)
treed9fc17dee651029a145832863d97cbfcaaf32244
parentf7009499bc593c23ec4fe9525f4e545ad0c16691 (diff)
xfs: don't perform discard if the given range length is less than block size
commit f9fd0135610084abef6867d984e9951c3099950d upstream. For discard operation, we should return EINVAL if the given range length is less than a block size, otherwise it will go through the file system to discard data blocks as the end range might be evaluated to -1, e.g, /xfs7: 9811378176 bytes were trimmed This issue can be triggered via xfstests/generic/288. Also, it seems to get the request queue pointer via bdev_get_queue() instead of the hard code pointer dereference is not a bad thing. Signed-off-by: Jie Liu <jeff.liu@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Ben Myers <bpm@sgi.com> Signed-off-by: Jiri Slaby <jslaby@suse.cz>
-rw-r--r--fs/xfs/xfs_discard.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/xfs/xfs_discard.c b/fs/xfs/xfs_discard.c
index 45560ee1a4ba..19d9fd6caf8c 100644
--- a/fs/xfs/xfs_discard.c
+++ b/fs/xfs/xfs_discard.c
@@ -158,7 +158,7 @@ xfs_ioc_trim(
struct xfs_mount *mp,
struct fstrim_range __user *urange)
{
- struct request_queue *q = mp->m_ddev_targp->bt_bdev->bd_disk->queue;
+ struct request_queue *q = bdev_get_queue(mp->m_ddev_targp->bt_bdev);
unsigned int granularity = q->limits.discard_granularity;
struct fstrim_range range;
xfs_daddr_t start, end, minlen;
@@ -181,7 +181,8 @@ xfs_ioc_trim(
* matter as trimming blocks is an advisory interface.
*/
if (range.start >= XFS_FSB_TO_B(mp, mp->m_sb.sb_dblocks) ||
- range.minlen > XFS_FSB_TO_B(mp, XFS_ALLOC_AG_MAX_USABLE(mp)))
+ range.minlen > XFS_FSB_TO_B(mp, XFS_ALLOC_AG_MAX_USABLE(mp)) ||
+ range.len < mp->m_sb.sb_blocksize)
return -XFS_ERROR(EINVAL);
start = BTOBB(range.start);