[PATCH 1/7] xfs: split inode data writeback from xfs_sync_inodes_ag

Christoph Hellwig
2009-05-14T17:15:52Z

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From: Dave Chinner <david@fromorbit.com>

In many cases we only want to sync inode data. Start spliting the inode sync
into data sync and inode sync by factoring out the inode data flush.

[hch: minor cleanups]

Signed-off-by: Dave Chinner <david@fromorbit.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

Index: xfs/fs/xfs/linux-2.6/xfs_sync.c
===================================================================
--- xfs.orig/fs/xfs/linux-2.6/xfs_sync.c 2009-05-12 23:28:45.023811837 +0200
+++ xfs/fs/xfs/linux-2.6/xfs_sync.c 2009-05-13 10:00:27.169659271 +0200
@@ -48,6 +48,34 @@
#include <linux/kthread.h>
#include <linux/freezer.h>

+
+STATIC int
+xfs_sync_inode_data(
+ struct xfs_inode *ip,
+ int flags)
+{
+ struct inode *inode = VFS_I(ip);
+ struct address_space *mapping = inode->i_mapping;
+ int error = 0;
+
+ if (mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) {
+ if (!xfs_ilock_nowait(ip, XFS_IOLOCK_SHARED)) {
+ if (flags & SYNC_TRYLOCK)
+ goto out_wait;
+ xfs_ilock(ip, XFS_IOLOCK_SHARED);
+ }
+
+ error = xfs_flush_pages(ip, 0, -1, (flags & SYNC_WAIT) ?
+ 0 : XFS_B_ASYNC, FI_NONE);
+ xfs_iunlock(ip, XFS_IOLOCK_SHARED);
+ }
+
+ out_wait:
+ if (flags & SYNC_IOWAIT)
+ xfs_ioend_wait(ip);
+ return error;
+}
+
/*
* Sync all the inodes in the given AG according to the
* direction given by the flags.
@@ -123,27 +151,10 @@ xfs_sync_inodes_ag(
* If we have to flush data or wait for I/O completion
* we need to hold the iolock.
*/
- if (flags & SYNC_DELWRI) {
- if (VN_DIRTY(inode)) {
- if (flags & SYNC_TRYLOCK) {
- if (xfs_ilock_nowait(ip, XFS_IOLOCK_SHARED))
- lock_flags |= XFS_IOLOCK_SHARED;
- } else {
- xfs_ilock(ip, XFS_IOLOCK_SHARED);
- lock_flags |= XFS_IOLOCK_SHARED;
- }
- if (lock_flags & XFS_IOLOCK_SHARED) {
- error = xfs_flush_pages(ip, 0, -1,
- (flags & SYNC_WAIT) ? 0
- : XFS_B_ASYNC,
- FI_NONE);
- }
- }
- if (VN_CACHED(inode) && (flags & SYNC_IOWAIT))
- xfs_ioend_wait(ip);
- }
- xfs_ilock(ip, XFS_ILOCK_SHARED);
+ if (flags & SYNC_DELWRI)
+ error = xfs_sync_inode_data(ip, flags);

+ xfs_ilock(ip, XFS_ILOCK_SHARED);
if ((flags & SYNC_ATTR) && !xfs_inode_clean(ip)) {
if (flags & SYNC_WAIT) {
xfs_iflock(ip);