Code refactor for more logical code layout.
No behavior change.
- remove the mis-named __writeback_inodes_sb()
- wb_writeback()/writeback_inodes_wb() will decide when to queue_io()
before calling __writeback_inodes_wb()
Signed-off-by: Wu Fengguang <fengguang.wu@xxxxxxxxx>
---
fs/fs-writeback.c | 27 ++++++++++++---------------
1 file changed, 12 insertions(+), 15 deletions(-)
--- linux-next.orig/fs/fs-writeback.c 2011-04-26 13:20:17.000000000 +0800
+++ linux-next/fs/fs-writeback.c 2011-04-26 13:30:19.000000000 +0800
@@ -570,17 +570,13 @@ static int writeback_sb_inodes(struct su
return 1;
}
-void writeback_inodes_wb(struct bdi_writeback *wb,
- struct writeback_control *wbc)
+static void __writeback_inodes_wb(struct bdi_writeback *wb,
+ struct writeback_control *wbc)
{
int ret = 0;
if (!wbc->wb_start)
wbc->wb_start = jiffies; /* livelock avoidance */
- spin_lock(&wb->list_lock);
-
- if (list_empty(&wb->b_io))
- queue_io(wb, wbc);
while (!list_empty(&wb->b_io)) {
struct inode *inode = wb_inode(wb->b_io.prev);
@@ -596,19 +592,16 @@ void writeback_inodes_wb(struct bdi_writ
if (ret)
break;
}
- spin_unlock(&wb->list_lock);
/* Leave any unwritten inodes on b_io */
}
-static void __writeback_inodes_sb(struct super_block *sb,
- struct bdi_writeback *wb, struct writeback_control *wbc)
+void writeback_inodes_wb(struct bdi_writeback *wb,
+ struct writeback_control *wbc)
{
- WARN_ON(!rwsem_is_locked(&sb->s_umount));
-
spin_lock(&wb->list_lock);
if (list_empty(&wb->b_io))
queue_io(wb, wbc);
- writeback_sb_inodes(sb, wb, wbc, true);
+ __writeback_inodes_wb(wb, wbc);
spin_unlock(&wb->list_lock);
}
@@ -674,7 +667,7 @@ static long wb_writeback(struct bdi_writ
* The intended call sequence for WB_SYNC_ALL writeback is:
*
* wb_writeback()
- * __writeback_inodes_sb() <== called only once
+ * writeback_sb_inodes() <== called only once
* write_cache_pages() <== called once for each inode
* (quickly) tag currently dirty pages
* (maybe slowly) sync all tagged pages
@@ -722,10 +715,14 @@ static long wb_writeback(struct bdi_writ
retry:
trace_wbc_writeback_start(&wbc, wb->bdi);
+ spin_lock(&wb->list_lock);
+ if (list_empty(&wb->b_io))
+ queue_io(wb, &wbc);
if (work->sb)
- __writeback_inodes_sb(work->sb, wb, &wbc);
+ writeback_sb_inodes(work->sb, wb, &wbc, true);
else
- writeback_inodes_wb(wb, &wbc);
+ __writeback_inodes_wb(wb, &wbc);
+ spin_unlock(&wb->list_lock);
trace_wbc_writeback_written(&wbc, wb->bdi);
work->nr_pages -= write_chunk - wbc.nr_to_write;
--
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