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authorMinchan Kim2017-11-15 17:33:00 -0800
committerLinus Torvalds2017-11-15 18:21:02 -0800
commit23c47d2ada9f96731492a67b28c0072715075baa (patch)
treedbe8a9322eab448997e27b19b1b39b235eaddd2a /drivers/nvdimm
parente447a0151f7ce8dd884fea48279274bd64434c29 (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')
-rw-r--r--drivers/nvdimm/btt.c3
-rw-r--r--drivers/nvdimm/pmem.c2
2 files changed, 5 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);
diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index 39dfd7affa31..7fbc5c5dc8e1 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -31,6 +31,7 @@
#include <linux/uio.h>
#include <linux/dax.h>
#include <linux/nd.h>
+#include <linux/backing-dev.h>
#include "pmem.h"
#include "pfn.h"
#include "nd.h"
@@ -394,6 +395,7 @@ static int pmem_attach_disk(struct device *dev,
disk->fops = &pmem_fops;
disk->queue = q;
disk->flags = GENHD_FL_EXT_DEVT;
+ disk->queue->backing_dev_info->capabilities |= BDI_CAP_SYNCHRONOUS_IO;
nvdimm_namespace_disk_name(ndns, disk->disk_name);
set_capacity(disk, (pmem->size - pmem->pfn_pad - pmem->data_offset)
/ 512);