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authorDave Chinner <dchinner@redhat.com>2014-05-07 08:05:50 +1000
committerDave Chinner <david@fromorbit.com>2014-05-07 08:05:50 +1000
commitac983517ec5941da0c58cacdbad10a231dc4e001 (patch)
tree94429a350fd54358b1dfc3430124255f7e6bf5b4 /fs/xfs/xfs_log.c
parent49abc3a8f84146f74daadbaa7cde7d34f2bb40a8 (diff)
downloadop-kernel-dev-ac983517ec5941da0c58cacdbad10a231dc4e001.zip
op-kernel-dev-ac983517ec5941da0c58cacdbad10a231dc4e001.tar.gz
xfs: don't sleep in xlog_cil_force_lsn on shutdown
Reports of a shutdown hang when fsyncing a directory have surfaced, such as this: [ 3663.394472] Call Trace: [ 3663.397199] [<ffffffff815f1889>] schedule+0x29/0x70 [ 3663.402743] [<ffffffffa01feda5>] xlog_cil_force_lsn+0x185/0x1a0 [xfs] [ 3663.416249] [<ffffffffa01fd3af>] _xfs_log_force_lsn+0x6f/0x2f0 [xfs] [ 3663.429271] [<ffffffffa01a339d>] xfs_dir_fsync+0x7d/0xe0 [xfs] [ 3663.435873] [<ffffffff811df8c5>] do_fsync+0x65/0xa0 [ 3663.441408] [<ffffffff811dfbc0>] SyS_fsync+0x10/0x20 [ 3663.447043] [<ffffffff815fc7d9>] system_call_fastpath+0x16/0x1b If we trigger a shutdown in xlog_cil_push() from xlog_write(), we will never wake waiters on the current push sequence number, so anything waiting in xlog_cil_force_lsn() for that push sequence number to come up will not get woken and hence stall the shutdown. Fix this by ensuring we call wake_up_all(&cil->xc_commit_wait) in the push abort handling, in the log shutdown code when waking all waiters, and adding a shutdown check in the sequence completion wait loops to ensure they abort when a wakeup due to a shutdown occurs. Reported-by: Boris Ranto <branto@redhat.com> Reported-by: Eric Sandeen <esandeen@redhat.com> Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Brian Foster <bfoster@redhat.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
Diffstat (limited to 'fs/xfs/xfs_log.c')
-rw-r--r--fs/xfs/xfs_log.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c
index 8497a00..82f5602 100644
--- a/fs/xfs/xfs_log.c
+++ b/fs/xfs/xfs_log.c
@@ -3915,11 +3915,14 @@ xfs_log_force_umount(
retval = xlog_state_ioerror(log);
spin_unlock(&log->l_icloglock);
}
+
/*
- * Wake up everybody waiting on xfs_log_force.
- * Callback all log item committed functions as if the
- * log writes were completed.
+ * Wake up everybody waiting on xfs_log_force. Wake the CIL push first
+ * as if the log writes were completed. The abort handling in the log
+ * item committed callback functions will do this again under lock to
+ * avoid races.
*/
+ wake_up_all(&log->l_cilp->xc_commit_wait);
xlog_state_do_callback(log, XFS_LI_ABORTED, NULL);
#ifdef XFSERRORDEBUG
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