[XFS] Move xfs_attr_rolltrans to xfs_trans_roll

Move it from the attr code to the transaction code and make
the attr code call the new function.

We rolltrans is really usefull whenever we want to use rolling
transaction, should be generic, it isn't dependent on any part
of the attr code anyway.

We use this excuse to change all the:

if ((error = xfs_attr_rolltrans()))

calls into:

error = xfs_trans_roll();

if (error)

SGI-PV: 981498

SGI-Modid: xfs-linux-melb:xfs-kern:31729a

Signed-off-by: Niv Sardi <xaiki@sgi.com>
Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>

1 files changed, 63 insertions, 0 deletions

diff --git a/fs/xfs/xfs_trans.c b/fs/xfs/xfs_trans.c
index e4ebddd3c500..d98758a09677 100644
--- a/fs/xfs/xfs_trans.c
+++ b/fs/xfs/xfs_trans.c
@@ -43,6 +43,7 @@
 #include "xfs_quota.h"
 #include "xfs_trans_priv.h"
 #include "xfs_trans_space.h"
+#include "xfs_inode_item.h"
 
 
 STATIC void	xfs_trans_apply_sb_deltas(xfs_trans_t *);
@@ -1216,6 +1217,68 @@ xfs_trans_free(
 	kmem_zone_free(xfs_trans_zone, tp);
 }
 
+/*
+ * Roll from one trans in the sequence of PERMANENT transactions to
+ * the next: permanent transactions are only flushed out when
+ * committed with XFS_TRANS_RELEASE_LOG_RES, but we still want as soon
+ * as possible to let chunks of it go to the log. So we commit the
+ * chunk we've been working on and get a new transaction to continue.
+ */
+int
+xfs_trans_roll(
+	struct xfs_trans	**tpp,
+	struct xfs_inode	*dp)
+{
+	struct xfs_trans	*trans;
+	unsigned int		logres, count;
+	int			error;
+
+	/*
+	 * Ensure that the inode is always logged.
+	 */
+	trans = *tpp;
+	xfs_trans_log_inode(trans, dp, XFS_ILOG_CORE);
+
+	/*
+	 * Copy the critical parameters from one trans to the next.
+	 */
+	logres = trans->t_log_res;
+	count = trans->t_log_count;
+	*tpp = xfs_trans_dup(trans);
+
+	/*
+	 * Commit the current transaction.
+	 * If this commit failed, then it'd just unlock those items that
+	 * are not marked ihold. That also means that a filesystem shutdown
+	 * is in progress. The caller takes the responsibility to cancel
+	 * the duplicate transaction that gets returned.
+	 */
+	error = xfs_trans_commit(trans, 0);
+	if (error)
+		return (error);
+
+	trans = *tpp;
+
+	/*
+	 * Reserve space in the log for th next transaction.
+	 * This also pushes items in the "AIL", the list of logged items,
+	 * out to disk if they are taking up space at the tail of the log
+	 * that we want to use.  This requires that either nothing be locked
+	 * across this call, or that anything that is locked be logged in
+	 * the prior and the next transactions.
+	 */
+	error = xfs_trans_reserve(trans, 0, logres, 0,
+				  XFS_TRANS_PERM_LOG_RES, count);
+	/*
+	 *  Ensure that the inode is in the new transaction and locked.
+	 */
+	if (error)
+		return error;
+
+	xfs_trans_ijoin(trans, dp, XFS_ILOCK_EXCL);
+	xfs_trans_ihold(trans, dp);
+	return 0;
+}
 
 /*
  * THIS SHOULD BE REWRITTEN TO USE xfs_trans_next_item().