writeback: elevate queue_io() into wb_writeback()
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()
Acked-by: Jan Kara <jack@suse.cz>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 36a3091..565b1fd 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -580,17 +580,13 @@
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->older_than_this);
while (!list_empty(&wb->b_io)) {
struct inode *inode = wb_inode(wb->b_io.prev);
@@ -606,19 +602,16 @@
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->older_than_this);
- writeback_sb_inodes(sb, wb, wbc, true);
+ __writeback_inodes_wb(wb, wbc);
spin_unlock(&wb->list_lock);
}
@@ -685,7 +678,7 @@
* 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
@@ -694,6 +687,7 @@
write_chunk = LONG_MAX;
wbc.wb_start = jiffies; /* livelock avoidance */
+ spin_lock(&wb->list_lock);
for (;;) {
/*
* Stop writeback when nr_pages has been consumed
@@ -730,10 +724,12 @@
wbc.inodes_written = 0;
trace_wbc_writeback_start(&wbc, wb->bdi);
+ if (list_empty(&wb->b_io))
+ queue_io(wb, wbc.older_than_this);
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);
trace_wbc_writeback_written(&wbc, wb->bdi);
work->nr_pages -= write_chunk - wbc.nr_to_write;
@@ -761,7 +757,6 @@
* become available for writeback. Otherwise
* we'll just busyloop.
*/
- spin_lock(&wb->list_lock);
if (!list_empty(&wb->b_more_io)) {
inode = wb_inode(wb->b_more_io.prev);
trace_wbc_writeback_wait(&wbc, wb->bdi);
@@ -769,8 +764,8 @@
inode_wait_for_writeback(inode, wb);
spin_unlock(&inode->i_lock);
}
- spin_unlock(&wb->list_lock);
}
+ spin_unlock(&wb->list_lock);
return wrote;
}