patch-2.4.15 linux/fs/ext3/fsync.c

• Lines: 71
• Date: Tue Nov 20 21:34:13 2001
• Orig file: v2.4.14/linux/fs/ext3/fsync.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.14/linux/fs/ext3/fsync.c linux/fs/ext3/fsync.c
@@ -0,0 +1,70 @@
+/*
+ *  linux/fs/ext3/fsync.c
+ *
+ *  Copyright (C) 1993  Stephen Tweedie (sct@redhat.com)
+ *  from
+ *  Copyright (C) 1992  Remy Card (card@masi.ibp.fr)
+ *                      Laboratoire MASI - Institut Blaise Pascal
+ *                      Universite Pierre et Marie Curie (Paris VI)
+ *  from
+ *  linux/fs/minix/truncate.c   Copyright (C) 1991, 1992  Linus Torvalds
+ * 
+ *  ext3fs fsync primitive
+ *
+ *  Big-endian to little-endian byte-swapping/bitmaps by
+ *        David S. Miller (davem@caip.rutgers.edu), 1995
+ * 
+ *  Removed unnecessary code duplication for little endian machines
+ *  and excessive __inline__s. 
+ *        Andi Kleen, 1997
+ *
+ * Major simplications and cleanup - we only need to do the metadata, because
+ * we can depend on generic_block_fdatasync() to sync the data blocks.
+ */
+
+#include <linux/sched.h>
+#include <linux/fs.h>
+#include <linux/jbd.h>
+#include <linux/ext3_fs.h>
+#include <linux/ext3_jbd.h>
+#include <linux/jbd.h>
+#include <linux/smp_lock.h>
+
+/*
+ * akpm: A new design for ext3_sync_file().
+ *
+ * This is only called from sys_fsync(), sys_fdatasync() and sys_msync().
+ * There cannot be a transaction open by this task. (AKPM: quotas?)
+ * Another task could have dirtied this inode.  Its data can be in any
+ * state in the journalling system.
+ *
+ * What we do is just kick off a commit and wait on it.  This will snapshot the
+ * inode to disk.
+ *
+ * Note that there is a serious optimisation we can make here: if the current
+ * inode is not part of j_running_transaction or j_committing_transaction
+ * then we have nothing to do.  That would require implementation of t_ilist,
+ * which isn't too hard.
+ */
+
+int ext3_sync_file(struct file * file, struct dentry *dentry, int datasync)
+{
+	struct inode *inode = dentry->d_inode;
+	int ret;
+
+	J_ASSERT(ext3_journal_current_handle() == 0);
+
+	/*
+	 * fsync_inode_buffers() just walks i_dirty_buffers and waits
+	 * on them.  It's a no-op for full data journalling because
+	 * i_dirty_buffers will be ampty.
+	 * Really, we only need to start I/O on the dirty buffers -
+	 * we'll end up waiting on them in commit.
+	 */
+	ret = fsync_inode_buffers(inode);
+	ret |= fsync_inode_data_buffers(inode);
+
+	ext3_force_commit(inode->i_sb);
+
+	return ret;
+}