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-rw-r--r--fs/fs-writeback.c33
1 files changed, 22 insertions, 11 deletions
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 09c11329a17c..1f4a10ece2f1 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -40,13 +40,18 @@
struct wb_writeback_work {
long nr_pages;
struct super_block *sb;
- unsigned long *older_than_this;
+ /*
+ * Write only inodes dirtied before this time. Don't forget to set
+ * older_than_this_is_set when you set this.
+ */
+ unsigned long older_than_this;
enum writeback_sync_modes sync_mode;
unsigned int tagged_writepages:1;
unsigned int for_kupdate:1;
unsigned int range_cyclic:1;
unsigned int for_background:1;
unsigned int for_sync:1; /* sync(2) WB_SYNC_ALL writeback */
+ unsigned int older_than_this_is_set:1;
enum wb_reason reason; /* why was writeback initiated? */
struct list_head list; /* pending work list */
@@ -247,10 +252,10 @@ static int move_expired_inodes(struct list_head *delaying_queue,
int do_sb_sort = 0;
int moved = 0;
+ WARN_ON_ONCE(!work->older_than_this_is_set);
while (!list_empty(delaying_queue)) {
inode = wb_inode(delaying_queue->prev);
- if (work->older_than_this &&
- inode_dirtied_after(inode, *work->older_than_this))
+ if (inode_dirtied_after(inode, work->older_than_this))
break;
list_move(&inode->i_wb_list, &tmp);
moved++;
@@ -734,6 +739,8 @@ static long writeback_inodes_wb(struct bdi_writeback *wb, long nr_pages,
.sync_mode = WB_SYNC_NONE,
.range_cyclic = 1,
.reason = reason,
+ .older_than_this = jiffies,
+ .older_than_this_is_set = 1,
};
spin_lock(&wb->list_lock);
@@ -792,12 +799,13 @@ static long wb_writeback(struct bdi_writeback *wb,
{
unsigned long wb_start = jiffies;
long nr_pages = work->nr_pages;
- unsigned long oldest_jif;
struct inode *inode;
long progress;
- oldest_jif = jiffies;
- work->older_than_this = &oldest_jif;
+ if (!work->older_than_this_is_set) {
+ work->older_than_this = jiffies;
+ work->older_than_this_is_set = 1;
+ }
spin_lock(&wb->list_lock);
for (;;) {
@@ -831,10 +839,10 @@ static long wb_writeback(struct bdi_writeback *wb,
* safe.
*/
if (work->for_kupdate) {
- oldest_jif = jiffies -
+ work->older_than_this = jiffies -
msecs_to_jiffies(dirty_expire_interval * 10);
} else if (work->for_background)
- oldest_jif = jiffies;
+ work->older_than_this = jiffies;
trace_writeback_start(wb->bdi, work);
if (list_empty(&wb->b_io))
@@ -1346,18 +1354,21 @@ EXPORT_SYMBOL(try_to_writeback_inodes_sb);
/**
* sync_inodes_sb - sync sb inode pages
- * @sb: the superblock
+ * @sb: the superblock
+ * @older_than_this: timestamp
*
* This function writes and waits on any dirty inode belonging to this
- * super_block.
+ * superblock that has been dirtied before given timestamp.
*/
-void sync_inodes_sb(struct super_block *sb)
+void sync_inodes_sb(struct super_block *sb, unsigned long older_than_this)
{
DECLARE_COMPLETION_ONSTACK(done);
struct wb_writeback_work work = {
.sb = sb,
.sync_mode = WB_SYNC_ALL,
.nr_pages = LONG_MAX,
+ .older_than_this = older_than_this,
+ .older_than_this_is_set = 1,
.range_cyclic = 0,
.done = &done,
.reason = WB_REASON_SYNC,