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authorTejun Heo <tj@kernel.org>2015-05-22 17:13:26 -0400
committerJens Axboe <axboe@fb.com>2015-06-02 08:33:34 -0600
commit4452226ea276e74fc3e252c88d9bb7e8f8e44bf0 (patch)
tree793638cb2a6a027a84ec9cd69fc6cd68c330c212 /block
parentad7fa852d3d2816d68a138ebc5bc8967aeb7fd86 (diff)
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writeback: move backing_dev_info->state 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->state into wb. * enum bdi_state is renamed to wb_state and the prefix of all enums is changed from BDI_ to WB_. * Explicit zeroing of bdi->state is removed without adding zeoring of wb->state as the whole data structure is zeroed on init anyway. * As there's still only one bdi_writeback per backing_dev_info, all uses of bdi->state are mechanically replaced with bdi->wb.state 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: drbd-dev@lists.linbit.com Cc: Neil Brown <neilb@suse.de> Cc: Alasdair Kergon <agk@redhat.com> Cc: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block')
-rw-r--r--block/blk-core.c1
1 files changed, 0 insertions, 1 deletions
diff --git a/block/blk-core.c b/block/blk-core.c
index 4afac14d4499..c3ba9c3b08d4 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -621,7 +621,6 @@ struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id)
q->backing_dev_info.ra_pages =
(VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE;
- q->backing_dev_info.state = 0;
q->backing_dev_info.capabilities = 0;
q->backing_dev_info.name = "block";
q->node = node_id;