diff options
| author | Minchan Kim <minchan@kernel.org> | 2017-11-15 17:33:00 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-11-15 18:21:02 -0800 |
| commit | 23c47d2ada9f96731492a67b28c0072715075baa (patch) | |
| tree | dbe8a9322eab448997e27b19b1b39b235eaddd2a /drivers/nvdimm/btt.c | |
| parent | e447a0151f7ce8dd884fea48279274bd64434c29 (diff) | |
bdi: introduce BDI_CAP_SYNCHRONOUS_IO
As discussed at
https://lkml.kernel.org/r/<20170728165604.10455-1-ross.zwisler@linux.intel.com>
someday we will remove rw_page(). If so, we need something to detect
such super-fast storage on which synchronous IO operations like the
current rw_page are always a win.
Introduces BDI_CAP_SYNCHRONOUS_IO to indicate such devices. With it, we
could use various optimization techniques.
Link: http://lkml.kernel.org/r/1505886205-9671-3-git-send-email-minchan@kernel.org
Signed-off-by: Minchan Kim <minchan@kernel.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Ilya Dryomov <idryomov@gmail.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Huang Ying <ying.huang@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/nvdimm/btt.c')
| -rw-r--r-- | drivers/nvdimm/btt.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/nvdimm/btt.c b/drivers/nvdimm/btt.c index d5612bd1cc81..e949e3302af4 100644 --- a/drivers/nvdimm/btt.c +++ b/drivers/nvdimm/btt.c @@ -23,6 +23,7 @@ #include <linux/ndctl.h> #include <linux/fs.h> #include <linux/nd.h> +#include <linux/backing-dev.h> #include "btt.h" #include "nd.h" @@ -1402,6 +1403,8 @@ static int btt_blk_init(struct btt *btt) btt->btt_disk->private_data = btt; btt->btt_disk->queue = btt->btt_queue; btt->btt_disk->flags = GENHD_FL_EXT_DEVT; + btt->btt_disk->queue->backing_dev_info->capabilities |= + BDI_CAP_SYNCHRONOUS_IO; blk_queue_make_request(btt->btt_queue, btt_make_request); blk_queue_logical_block_size(btt->btt_queue, btt->sector_size); |