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authorTejun Heo <tj@kernel.org>2015-05-23 00:13:28 +0300
committerJens Axboe <axboe@fb.com>2015-06-02 17:33:34 +0300
commita88a341a73be4ef035ca26170c849f002797da27 (patch)
tree3b9ba08daa3fdfb00d02ba21dfbce702a03826bc /fs/fs-writeback.c
parent93f78d882865cb90020d0f80a9523c99cf46924c (diff)
downloadlinux-a88a341a73be4ef035ca26170c849f002797da27.tar.xz
writeback: move bandwidth related fields from backing_dev_info into bdi_writeback
Currently, a bdi (backing_dev_info) embeds single wb (bdi_writeback) and the role of the separation is unclear. For cgroup support for writeback IOs, a bdi will be updated to host multiple wb's where each wb serves writeback IOs of a different cgroup on the bdi. To achieve that, a wb should carry all states necessary for servicing writeback IOs for a cgroup independently. This patch moves bandwidth related fields from backing_dev_info into bdi_writeback. * The moved fields are: bw_time_stamp, dirtied_stamp, written_stamp, write_bandwidth, avg_write_bandwidth, dirty_ratelimit, balanced_dirty_ratelimit, completions and dirty_exceeded. * writeback_chunk_size() and over_bground_thresh() now take @wb instead of @bdi. * bdi_writeout_fraction(bdi, ...) -> wb_writeout_fraction(wb, ...) bdi_dirty_limit(bdi, ...) -> wb_dirty_limit(wb, ...) bdi_position_ration(bdi, ...) -> wb_position_ratio(wb, ...) bdi_update_writebandwidth(bdi, ...) -> wb_update_write_bandwidth(wb, ...) [__]bdi_update_bandwidth(bdi, ...) -> [__]wb_update_bandwidth(wb, ...) bdi_{max|min}_pause(bdi, ...) -> wb_{max|min}_pause(wb, ...) bdi_dirty_limits(bdi, ...) -> wb_dirty_limits(wb, ...) * Init/exits of the relocated fields are moved to bdi_wb_init/exit() respectively. Note that explicit zeroing is dropped in the process as wb's are cleared in entirety anyway. * As there's still only one bdi_writeback per backing_dev_info, all uses of bdi->stat[] are mechanically replaced with bdi->wb.stat[] introducing no behavior changes. v2: Typo in description fixed as suggested by Jan. Signed-off-by: Tejun Heo <tj@kernel.org> Reviewed-by: Jan Kara <jack@suse.cz> Cc: Jens Axboe <axboe@kernel.dk> Cc: Wu Fengguang <fengguang.wu@intel.com> Cc: Jaegeuk Kim <jaegeuk@kernel.org> Cc: Steven Whitehouse <swhiteho@redhat.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'fs/fs-writeback.c')
-rw-r--r--fs/fs-writeback.c17
1 files changed, 8 insertions, 9 deletions
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 8873ecd1578c..1945cb9f6b97 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -624,7 +624,7 @@ out:
return ret;
}
-static long writeback_chunk_size(struct backing_dev_info *bdi,
+static long writeback_chunk_size(struct bdi_writeback *wb,
struct wb_writeback_work *work)
{
long pages;
@@ -645,7 +645,7 @@ static long writeback_chunk_size(struct backing_dev_info *bdi,
if (work->sync_mode == WB_SYNC_ALL || work->tagged_writepages)
pages = LONG_MAX;
else {
- pages = min(bdi->avg_write_bandwidth / 2,
+ pages = min(wb->avg_write_bandwidth / 2,
global_dirty_limit / DIRTY_SCOPE);
pages = min(pages, work->nr_pages);
pages = round_down(pages + MIN_WRITEBACK_PAGES,
@@ -743,7 +743,7 @@ static long writeback_sb_inodes(struct super_block *sb,
inode->i_state |= I_SYNC;
spin_unlock(&inode->i_lock);
- write_chunk = writeback_chunk_size(wb->bdi, work);
+ write_chunk = writeback_chunk_size(wb, work);
wbc.nr_to_write = write_chunk;
wbc.pages_skipped = 0;
@@ -830,7 +830,7 @@ static long writeback_inodes_wb(struct bdi_writeback *wb, long nr_pages,
return nr_pages - work.nr_pages;
}
-static bool over_bground_thresh(struct backing_dev_info *bdi)
+static bool over_bground_thresh(struct bdi_writeback *wb)
{
unsigned long background_thresh, dirty_thresh;
@@ -840,8 +840,7 @@ static bool over_bground_thresh(struct backing_dev_info *bdi)
global_page_state(NR_UNSTABLE_NFS) > background_thresh)
return true;
- if (wb_stat(&bdi->wb, WB_RECLAIMABLE) >
- bdi_dirty_limit(bdi, background_thresh))
+ if (wb_stat(wb, WB_RECLAIMABLE) > wb_dirty_limit(wb, background_thresh))
return true;
return false;
@@ -854,7 +853,7 @@ static bool over_bground_thresh(struct backing_dev_info *bdi)
static void wb_update_bandwidth(struct bdi_writeback *wb,
unsigned long start_time)
{
- __bdi_update_bandwidth(wb->bdi, 0, 0, 0, 0, 0, start_time);
+ __wb_update_bandwidth(wb, 0, 0, 0, 0, 0, start_time);
}
/*
@@ -906,7 +905,7 @@ static long wb_writeback(struct bdi_writeback *wb,
* For background writeout, stop when we are below the
* background dirty threshold
*/
- if (work->for_background && !over_bground_thresh(wb->bdi))
+ if (work->for_background && !over_bground_thresh(wb))
break;
/*
@@ -998,7 +997,7 @@ static unsigned long get_nr_dirty_pages(void)
static long wb_check_background_flush(struct bdi_writeback *wb)
{
- if (over_bground_thresh(wb->bdi)) {
+ if (over_bground_thresh(wb)) {
struct wb_writeback_work work = {
.nr_pages = LONG_MAX,