[RFC][PATCH 1/7] writeback: cleanup writeback_single_inode()

Wu Fengguang
2009-09-09T15:08:04Z

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Make the if-else straight in writeback_single_inode().
No behavior change.

Cc: Michael Rubin <mrubin@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Fengguang Wu <wfg@mail.ustc.edu.cn>
---
fs/fs-writeback.c | 15 +++++++--------
1 file changed, 7 insertions(+), 8 deletions(-)

--- linux.orig/fs/fs-writeback.c 2009-09-09 21:40:41.000000000 +0800
+++ linux/fs/fs-writeback.c 2009-09-09 21:41:14.000000000 +0800
@@ -417,8 +417,13 @@ writeback_single_inode(struct inode *ino
spin_lock(&inode_lock);
inode->i_state &= ~I_SYNC;
if (!(inode->i_state & (I_FREEING | I_CLEAR))) {
- if (!(inode->i_state & I_DIRTY) &&
- mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) {
+ if (inode->i_state & I_DIRTY) {
+ /*
+ * Someone redirtied the inode while were writing back
+ * the pages.
+ */
+ redirty_tail(inode);
+ } else if (mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) {
/*
* We didn't write back all the pages. nfs_writepages()
* sometimes bales out without doing anything. Redirty
@@ -462,12 +467,6 @@ writeback_single_inode(struct inode *ino
inode->i_state |= I_DIRTY_PAGES;
redirty_tail(inode);
}
- } else if (inode->i_state & I_DIRTY) {
- /*
- * Someone redirtied the inode while were writing back
- * the pages.
- */
- redirty_tail(inode);
} else if (atomic_read(&inode->i_count)) {
/*
* The inode is clean, inuse

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