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xfs: account for null transactions in bunmapi 

In e1a4e37cc7 ("xfs: try to avoid blowing out the transaction
reservation when bunmaping a shared extent"), we try to constrain the
amount of real extents we unmap from the data fork in a given call so
that we don't blow out transaction reservations.

However, not all bunmapi operations require a transaction -- if we're
only removing a delalloc extent, no transaction is needed, so we have to
code against that.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Darrick J. Wong 2017-12-10 18:03:53 -08:00
parent 6e643cd094
commit 8c57b88637
1 changed files with 1 additions and 1 deletions
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2
fs/xfs/libxfs/xfs_bmap.c
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@ -5136,7 +5136,7 @@ __xfs_bunmapi(
* blowing out the transaction with a mix of EFIs and reflink * blowing out the transaction with a mix of EFIs and reflink
* adjustments. * adjustments.
*/ */
if (xfs_is_reflink_inode(ip) && whichfork == XFS_DATA_FORK) if (tp && xfs_is_reflink_inode(ip) && whichfork == XFS_DATA_FORK)
max_len = min(len, xfs_refcount_max_unmap(tp->t_log_res)); max_len = min(len, xfs_refcount_max_unmap(tp->t_log_res));
else else
max_len = len; max_len = len;