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| author | Alex Elder <aelder@sgi.com> | 2011-07-11 09:51:44 -0500 |
|---|---|---|
| committer | Alex Elder <aelder@sgi.com> | 2011-07-11 10:21:03 -0500 |
| commit | b2ce39740066604288876c752d8170b3b17a21aa (patch) | |
| tree | fd51670cea52d4c4421ce98a65e8b4979535fb97 /fs/xfs/xfs_mount.c | |
| parent | 81463b1ca8dbd2f4f180feac3f49c7640e2b5f79 (diff) | |
| download | linux-b2ce39740066604288876c752d8170b3b17a21aa.tar.gz linux-b2ce39740066604288876c752d8170b3b17a21aa.tar.bz2 linux-b2ce39740066604288876c752d8170b3b17a21aa.zip | |
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 <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>
Diffstat (limited to 'fs/xfs/xfs_mount.c')
| -rw-r--r-- | fs/xfs/xfs_mount.c | 14 |
1 files changed, 7 insertions, 7 deletions
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) { |