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| author | Tejun Heo <tj@kernel.org> | 2015-05-22 23:13:26 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2015-06-02 16:33:34 +0200 |
| commit | 4452226ea276e74fc3e252c88d9bb7e8f8e44bf0 (patch) | |
| tree | 793638cb2a6a027a84ec9cd69fc6cd68c330c212 /block/blk-core.c | |
| parent | memcg: implement mem_cgroup_css_from_page() (diff) | |
| download | linux-4452226ea276e74fc3e252c88d9bb7e8f8e44bf0.tar.xz linux-4452226ea276e74fc3e252c88d9bb7e8f8e44bf0.zip | |
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/blk-core.c')
| -rw-r--r-- | block/blk-core.c | 1 |
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; |