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authorDarrick J. Wong <darrick.wong@oracle.com>2018-06-21 23:26:55 -0700
committerDarrick J. Wong <darrick.wong@oracle.com>2018-06-24 11:56:35 -0700
commit10ee25268e1f8475905e1deb85bb83627dca561e (patch)
tree2a897617e8b22c0f8e2e41c0c935082b6ffb4389 /fs/xfs
parente53946dbd31a21f4bef155f8febba556933d62bf (diff)
downloadlinux-10ee25268e1f8475905e1deb85bb83627dca561e.tar.bz2
xfs: allow empty transactions while frozen
In commit e89c041338ed6ef ("xfs: implement the GETFSMAP ioctl") we created the ability to obtain empty transactions. These transactions have no log or block reservations and therefore can't modify anything. Since they're also NO_WRITECOUNT they can run while the fs is frozen, so we don't need to WARN_ON about that usage. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Allison Henderson <allison.henderson@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'fs/xfs')
-rw-r--r--fs/xfs/xfs_trans.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/fs/xfs/xfs_trans.c b/fs/xfs/xfs_trans.c
index e040af120b69..524f543c5b82 100644
--- a/fs/xfs/xfs_trans.c
+++ b/fs/xfs/xfs_trans.c
@@ -258,7 +258,12 @@ xfs_trans_alloc(
if (!(flags & XFS_TRANS_NO_WRITECOUNT))
sb_start_intwrite(mp->m_super);
- WARN_ON(mp->m_super->s_writers.frozen == SB_FREEZE_COMPLETE);
+ /*
+ * Zero-reservation ("empty") transactions can't modify anything, so
+ * they're allowed to run while we're frozen.
+ */
+ WARN_ON(resp->tr_logres > 0 &&
+ mp->m_super->s_writers.frozen == SB_FREEZE_COMPLETE);
atomic_inc(&mp->m_active_trans);
tp = kmem_zone_zalloc(xfs_trans_zone,