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authorJan Kara <jack@suse.cz>2012-05-03 14:47:57 +0200
committerFengguang Wu <fengguang.wu@intel.com>2012-05-06 13:43:39 +0800
commit6290be1c1dc6589eeda213aa40946b27fa4faac8 (patch)
tree5c7aa9510c3210775b948b578fa844cbfe399aa0 /fs
parentcc1676d917f32504dbadc858fa790bc524c9f0da (diff)
downloadop-kernel-dev-6290be1c1dc6589eeda213aa40946b27fa4faac8.zip
op-kernel-dev-6290be1c1dc6589eeda213aa40946b27fa4faac8.tar.gz
writeback: Move I_DIRTY_PAGES handling
Instead of clearing I_DIRTY_PAGES and resetting it when we didn't succeed in writing them all, just clear the bit only when we succeeded writing all the pages. We also move the clearing of the bit close to other i_state handling to separate it from writeback list handling. This is desirable because list handling will differ for flusher thread and other writeback_single_inode() callers in future. No filesystem plays any tricks with I_DIRTY_PAGES (like checking it in ->writepages or ->write_inode implementation) so this movement is safe. Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/fs-writeback.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 65cd147..3804a10 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -385,7 +385,6 @@ writeback_single_inode(struct inode *inode, struct bdi_writeback *wb,
/* Set I_SYNC, reset I_DIRTY_PAGES */
inode->i_state |= I_SYNC;
- inode->i_state &= ~I_DIRTY_PAGES;
spin_unlock(&inode->i_lock);
spin_unlock(&wb->list_lock);
@@ -408,6 +407,9 @@ writeback_single_inode(struct inode *inode, struct bdi_writeback *wb,
* write_inode()
*/
spin_lock(&inode->i_lock);
+ /* Clear I_DIRTY_PAGES if we've written out all dirty pages */
+ if (!mapping_tagged(mapping, PAGECACHE_TAG_DIRTY))
+ inode->i_state &= ~I_DIRTY_PAGES;
dirty = inode->i_state & I_DIRTY;
inode->i_state &= ~(I_DIRTY_SYNC | I_DIRTY_DATASYNC);
spin_unlock(&inode->i_lock);
@@ -435,7 +437,6 @@ writeback_single_inode(struct inode *inode, struct bdi_writeback *wb,
* We didn't write back all the pages. nfs_writepages()
* sometimes bales out without doing anything.
*/
- inode->i_state |= I_DIRTY_PAGES;
if (wbc->nr_to_write <= 0) {
/*
* slice used up: queue for next turn
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