[XFS] Move remaining quiesce code.
With all the other filesystem sync code it in xfs_sync.c including the
data quiesce code, it makes sense to move the remaining quiesce code to
the same place.
SGI-PV: 988140
SGI-Modid: xfs-linux-melb:xfs-kern:32312a
Signed-off-by: David Chinner <david@fromorbit.com>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
Signed-off-by: Christoph Hellwig <hch@infradead.org>
diff --git a/fs/xfs/linux-2.6/xfs_sync.c b/fs/xfs/linux-2.6/xfs_sync.c
index ed24435..b2b7082 100644
--- a/fs/xfs/linux-2.6/xfs_sync.c
+++ b/fs/xfs/linux-2.6/xfs_sync.c
@@ -357,6 +357,61 @@
return error;
}
+STATIC void
+xfs_quiesce_fs(
+ struct xfs_mount *mp)
+{
+ int count = 0, pincount;
+
+ xfs_flush_buftarg(mp->m_ddev_targp, 0);
+ xfs_finish_reclaim_all(mp, 0, XFS_IFLUSH_DELWRI_ELSE_ASYNC);
+
+ /*
+ * This loop must run at least twice. The first instance of the loop
+ * will flush most meta data but that will generate more meta data
+ * (typically directory updates). Which then must be flushed and
+ * logged before we can write the unmount record.
+ */
+ do {
+ xfs_sync_inodes(mp, SYNC_ATTR|SYNC_WAIT);
+ pincount = xfs_flush_buftarg(mp->m_ddev_targp, 1);
+ if (!pincount) {
+ delay(50);
+ count++;
+ }
+ } while (count < 2);
+}
+
+/*
+ * Second stage of a quiesce. The data is already synced, now we have to take
+ * care of the metadata. New transactions are already blocked, so we need to
+ * wait for any remaining transactions to drain out before proceding.
+ */
+void
+xfs_quiesce_attr(
+ struct xfs_mount *mp)
+{
+ int error = 0;
+
+ /* wait for all modifications to complete */
+ while (atomic_read(&mp->m_active_trans) > 0)
+ delay(100);
+
+ /* flush inodes and push all remaining buffers out to disk */
+ xfs_quiesce_fs(mp);
+
+ ASSERT_ALWAYS(atomic_read(&mp->m_active_trans) == 0);
+
+ /* Push the superblock and write an unmount record */
+ error = xfs_log_sbcount(mp, 1);
+ if (error)
+ xfs_fs_cmn_err(CE_WARN, mp,
+ "xfs_attr_quiesce: failed to log sb changes. "
+ "Frozen image may not be consistent.");
+ xfs_log_unmount_write(mp);
+ xfs_unmountfs_writesb(mp);
+}
+
/*
* Enqueue a work item to be picked up by the vfs xfssyncd thread.
* Doing this has two advantages: