If an inode is backed by a memory-backed backing_dev, and it is not a blockdev
inode, we can skip the entire superblock duwing writeback scanning.
Signed-off-by: Andrew Morton <akpm@osdl.org>
---
25-akpm/fs/fs-writeback.c | 10 ++++++++--
1 files changed, 8 insertions(+), 2 deletions(-)
diff -puN fs/fs-writeback.c~memory-backed-inodes-fix fs/fs-writeback.c
--- 25/fs/fs-writeback.c~memory-backed-inodes-fix 2004-07-26 17:51:08.609511440 -0700
+++ 25-akpm/fs/fs-writeback.c 2004-07-26 17:51:08.613510832 -0700
@@ -304,14 +304,20 @@ sync_sb_inodes(struct super_block *sb, s
long pages_skipped;
if (bdi->memory_backed) {
+ list_move(&inode->i_list, &sb->s_dirty);
if (sb == blockdev_superblock) {
/*
* Dirty memory-backed blockdev: the ramdisk
- * driver does this.
+ * driver does this. Skip just this inode
*/
- list_move(&inode->i_list, &sb->s_dirty);
continue;
}
+ /*
+ * Dirty memory-backed inode against a filesystem other
+ * than the kernel-internal bdev filesystem. Skip the
+ * entire superblock.
+ */
+ break;
}
if (wbc->nonblocking && bdi_write_congested(bdi)) {
_