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SubjectRe: [PATCH 09/17] writeback: elevate queue_io() into wb_writeback()
On Fri 06-05-11 11:08:30, Wu Fengguang wrote:
> 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()
>
You can add:
Acked-by: Jan Kara <jack@suse.cz>

Honza

> Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
> ---
> fs/fs-writeback.c | 27 ++++++++++++---------------
> 1 file changed, 12 insertions(+), 15 deletions(-)
>
> --- linux-next.orig/fs/fs-writeback.c 2011-05-05 23:41:36.000000000 +0800
> +++ linux-next/fs/fs-writeback.c 2011-05-05 23:51:59.000000000 +0800
> @@ -580,17 +580,13 @@ 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->older_than_this);
>
> while (!list_empty(&wb->b_io)) {
> struct inode *inode = wb_inode(wb->b_io.prev);
> @@ -606,19 +602,16 @@ 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->older_than_this);
> - writeback_sb_inodes(sb, wb, wbc, true);
> + __writeback_inodes_wb(wb, wbc);
> spin_unlock(&wb->list_lock);
> }
>
> @@ -685,7 +678,7 @@ 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
> @@ -731,10 +724,14 @@ 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.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);
> + spin_unlock(&wb->list_lock);
> trace_wbc_writeback_written(&wbc, wb->bdi);
>
> work->nr_pages -= write_chunk - wbc.nr_to_write;
>
>
--
Jan Kara <jack@suse.cz>
SUSE Labs, CR


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