From b2ce39740066604288876c752d8170b3b17a21aa Mon Sep 17 00:00:00 2001 From: Alex Elder Date: Mon, 11 Jul 2011 09:51:44 -0500 Subject: Revert "xfs: fix filesystsem freeze race in xfs_trans_alloc" This reverts commit 7a249cf83da1813cfa71cfe1e265b40045eceb47. That commit created a situation that could lead to a filesystem hang. As Dave Chinner pointed out, xfs_trans_alloc() could hold a reference to m_active_trans (i.e., keep it non-zero) and then wait for SB_FREEZE_TRANS to complete. Meanwhile a filesystem freeze request could set SB_FREEZE_TRANS and then wait for m_active_trans to drop to zero. Nobody benefits from this sequence of events... Signed-off-by: Christoph Hellwig Signed-off-by: Alex Elder --- fs/xfs/xfs_mount.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) (limited to 'fs/xfs/xfs_mount.c') diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c index 2be5e5cf897a..a19e92381f90 100644 --- a/fs/xfs/xfs_mount.c +++ b/fs/xfs/xfs_mount.c @@ -1559,9 +1559,15 @@ xfs_fs_writable(xfs_mount_t *mp) } /* + * xfs_log_sbcount + * * Called either periodically to keep the on disk superblock values * roughly up to date or from unmount to make sure the values are * correct on a clean unmount. + * + * Note this code can be called during the process of freezing, so + * we may need to use the transaction allocator which does not not + * block when the transaction subsystem is in its frozen state. */ int xfs_log_sbcount( @@ -1583,13 +1589,7 @@ xfs_log_sbcount( if (!xfs_sb_version_haslazysbcount(&mp->m_sb)) return 0; - /* - * We can be called during the process of freezing, so make sure - * we go ahead even if the frozen for new transactions. We will - * always use a sync transaction in the freeze path to make sure - * the transaction has completed by the time we return. - */ - tp = _xfs_trans_alloc(mp, XFS_TRANS_SB_COUNT, KM_SLEEP, false); + tp = _xfs_trans_alloc(mp, XFS_TRANS_SB_COUNT, KM_SLEEP); error = xfs_trans_reserve(tp, 0, mp->m_sb.sb_sectsize + 128, 0, 0, XFS_DEFAULT_LOG_COUNT); if (error) { -- cgit v1.2.3