[XFS] Push some common code out of write path into core XFS code for

sharing.

SGI-PV: 904196
SGI-Modid: xfs-linux-melb:xfs-kern:26248a

Signed-off-by: Nathan Scott <nathans@sgi.com>

1 files changed, 85 insertions, 1 deletions

diff --git a/fs/xfs/xfs_rw.c b/fs/xfs/xfs_rw.c
index d33e4f5808e5..c55e28189aba 100644
--- a/fs/xfs/xfs_rw.c
+++ b/fs/xfs/xfs_rw.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
+ * Copyright (c) 2000-2006 Silicon Graphics, Inc.
  * All Rights Reserved.
  *
  * This program is free software; you can redistribute it and/or
@@ -92,6 +92,90 @@ xfs_write_clear_setuid(
 }
 
 /*
+ * Handle logging requirements of various synchronous types of write.
+ */
+int
+xfs_write_sync_logforce(
+        xfs_mount_t     *mp,
+        xfs_inode_t     *ip)
+{
+        int             error = 0;
+
+        /*
+         * If we're treating this as O_DSYNC and we have not updated the
+         * size, force the log.
+         */
+        if (!(mp->m_flags & XFS_MOUNT_OSYNCISOSYNC) &&
+            !(ip->i_update_size)) {
+                xfs_inode_log_item_t    *iip = ip->i_itemp;
+
+                /*
+                 * If an allocation transaction occurred
+                 * without extending the size, then we have to force
+                 * the log up the proper point to ensure that the
+                 * allocation is permanent.  We can't count on
+                 * the fact that buffered writes lock out direct I/O
+                 * writes - the direct I/O write could have extended
+                 * the size nontransactionally, then finished before
+                 * we started.  xfs_write_file will think that the file
+                 * didn't grow but the update isn't safe unless the
+                 * size change is logged.
+                 *
+                 * Force the log if we've committed a transaction
+                 * against the inode or if someone else has and
+                 * the commit record hasn't gone to disk (e.g.
+                 * the inode is pinned).  This guarantees that
+                 * all changes affecting the inode are permanent
+                 * when we return.
+                 */
+                if (iip && iip->ili_last_lsn) {
+                        xfs_log_force(mp, iip->ili_last_lsn,
+                                        XFS_LOG_FORCE | XFS_LOG_SYNC);
+                } else if (xfs_ipincount(ip) > 0) {
+                        xfs_log_force(mp, (xfs_lsn_t)0,
+                                        XFS_LOG_FORCE | XFS_LOG_SYNC);
+                }
+
+        } else {
+                xfs_trans_t     *tp;
+
+                /*
+                 * O_SYNC or O_DSYNC _with_ a size update are handled
+                 * the same way.
+                 *
+                 * If the write was synchronous then we need to make
+                 * sure that the inode modification time is permanent.
+                 * We'll have updated the timestamp above, so here
+                 * we use a synchronous transaction to log the inode.
+                 * It's not fast, but it's necessary.
+                 *
+                 * If this a dsync write and the size got changed
+                 * non-transactionally, then we need to ensure that
+                 * the size change gets logged in a synchronous
+                 * transaction.
+                 */
+                tp = xfs_trans_alloc(mp, XFS_TRANS_WRITE_SYNC);
+                if ((error = xfs_trans_reserve(tp, 0,
+                                                XFS_SWRITE_LOG_RES(mp),
+                                                0, 0, 0))) {
+                        /* Transaction reserve failed */
+                        xfs_trans_cancel(tp, 0);
+                } else {
+                        /* Transaction reserve successful */
+                        xfs_ilock(ip, XFS_ILOCK_EXCL);
+                        xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
+                        xfs_trans_ihold(tp, ip);
+                        xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
+                        xfs_trans_set_sync(tp);
+                        error = xfs_trans_commit(tp, 0, NULL);
+                        xfs_iunlock(ip, XFS_ILOCK_EXCL);
+                }
+        }
+
+        return error;
+}
+
+/*
  * Force a shutdown of the filesystem instantly while keeping
  * the filesystem consistent. We don't do an unmount here; just shutdown
  * the shop, make sure that absolutely nothing persistent happens to