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| author |   Jie Liu <jeff.liu@oracle.com> | 2013-11-20 16:08:53 +0800 |
|---|---|---|
| committer |   Ben Myers <bpm@sgi.com> | 2013-12-04 15:42:52 -0600 |
| commit | f9fd0135610084abef6867d984e9951c3099950d (patch) | |
| tree | 79015c1a36eececfe2e398ed11ab5ca742bf0ffe | |
| parent | xfs: fix the comment explaining xfs_trans_dqlockedjoin (diff) | |
| download | linux-dev-f9fd0135610084abef6867d984e9951c3099950d.tar.xz linux-dev-f9fd0135610084abef6867d984e9951c3099950d.zip | |
xfs: don't perform discard if the given range length is less than block size
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,
# fstrim -v -o 0 -l 100 /xfs7
/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>
| -rw-r--r-- | fs/xfs/xfs_discard.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/xfs/xfs_discard.c b/fs/xfs/xfs_discard.c index 8367d6dc18c9..4f11ef011139 100644 --- a/fs/xfs/xfs_discard.c +++ b/fs/xfs/xfs_discard.c @@ -157,7 +157,7 @@ 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; @@ -180,7 +180,8 @@ 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); |