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| author | Darrick J. Wong <darrick.wong@oracle.com> | 2018-06-21 23:26:55 -0700 |
|---|---|---|
| committer | Darrick J. Wong <darrick.wong@oracle.com> | 2018-06-24 11:56:35 -0700 |
| commit | 10ee25268e1f8475905e1deb85bb83627dca561e (patch) | |
| tree | 2a897617e8b22c0f8e2e41c0c935082b6ffb4389 /fs | |
| parent | e53946dbd31a21f4bef155f8febba556933d62bf (diff) | |
| download | lwn-10ee25268e1f8475905e1deb85bb83627dca561e.tar.gz lwn-10ee25268e1f8475905e1deb85bb83627dca561e.zip | |
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')
| -rw-r--r-- | fs/xfs/xfs_trans.c | 7 |
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, |