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authorTejun Heo <tj@kernel.org>2015-05-22 17:13:27 -0400
committerJens Axboe <axboe@fb.com>2015-06-02 08:33:34 -0600
commit93f78d882865cb90020d0f80a9523c99cf46924c (patch)
tree6cd9c3531085c7d51fbd6ec2086142255bc2c219 /fs/nfs/write.c
parent4452226ea276e74fc3e252c88d9bb7e8f8e44bf0 (diff)
downloadlinux-93f78d882865cb90020d0f80a9523c99cf46924c.tar.bz2
writeback: move backing_dev_info->bdi_stat[] 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 bdi->bdi_stat[] into wb. * enum bdi_stat_item is renamed to wb_stat_item and the prefix of all enums is changed from BDI_ to WB_. * BDI_STAT_BATCH() -> WB_STAT_BATCH() * [__]{add|inc|dec|sum}_wb_stat(bdi, ...) -> [__]{add|inc}_wb_stat(wb, ...) * bdi_stat[_error]() -> wb_stat[_error]() * bdi_writeout_inc() -> wb_writeout_inc() * stat init is moved to bdi_wb_init() and bdi_wb_exit() is added and frees stat. * 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. 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: Miklos Szeredi <miklos@szeredi.hu> Cc: Trond Myklebust <trond.myklebust@primarydata.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'fs/nfs/write.c')
-rw-r--r--fs/nfs/write.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index d12a4be613a5..94c7ce01dfb1 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -853,7 +853,8 @@ static void
nfs_clear_page_commit(struct page *page)
{
dec_zone_page_state(page, NR_UNSTABLE_NFS);
- dec_bdi_stat(inode_to_bdi(page_file_mapping(page)->host), BDI_RECLAIMABLE);
+ dec_wb_stat(&inode_to_bdi(page_file_mapping(page)->host)->wb,
+ WB_RECLAIMABLE);
}
/* Called holding inode (/cinfo) lock */