From: Toshi Kani <toshi.kani@hpe.com>
To: agk@redhat.com, snitzer@redhat.com, dan.j.williams@intel.com
Cc: ross.zwisler@linux.intel.com, viro@zeniv.linux.org.uk,
axboe@kernel.dk, toshi.kani@hpe.com, linux-nvdimm@ml01.01.org,
dm-devel@redhat.com, linux-raid@vger.kernel.org,
linux-kernel@vger.kernel.org,
Martin Schwidefsky <schwidefsky@de.ibm.com>,
Heiko Carstens <heiko.carstens@de.ibm.com>,
<linux-s390@vger.kernel.org>
Subject: [PATCH 1/6] genhd: Add GENHD_FL_DAX to gendisk flags
Date: Mon, 13 Jun 2016 16:21:32 -0600 [thread overview]
Message-ID: <1465856497-19698-2-git-send-email-toshi.kani@hpe.com> (raw)
In-Reply-To: <1465856497-19698-1-git-send-email-toshi.kani@hpe.com>
Currently, presence of direct_access() in block_device_operations
indicates support of DAX on its block device. Because
block_device_operations is instantiated with 'const', this DAX
capablity may not be enabled conditinally.
In preparation for supporting DAX to device-mapper devices, add
GENHD_FL_DAX to gendisk flags to indicate that this block device
supports DAX. This will allow to set the DAX capability based on
how mapped device is composed.
Signed-off-by: Toshi Kani <toshi.kani@hpe.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: <linux-s390@vger.kernel.org>
---
drivers/block/brd.c | 2 +-
drivers/nvdimm/pmem.c | 2 +-
drivers/s390/block/dcssblk.c | 1 +
include/linux/genhd.h | 2 +-
4 files changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/block/brd.c b/drivers/block/brd.c
index c04bd9b..43a6765 100644
--- a/drivers/block/brd.c
+++ b/drivers/block/brd.c
@@ -518,7 +518,7 @@ static struct brd_device *brd_alloc(int i)
disk->fops = &brd_fops;
disk->private_data = brd;
disk->queue = brd->brd_queue;
- disk->flags = GENHD_FL_EXT_DEVT;
+ disk->flags = GENHD_FL_EXT_DEVT | GENHD_FL_DAX;
sprintf(disk->disk_name, "ram%d", i);
set_capacity(disk, rd_size * 2);
diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index 608fc44..3847449 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -295,7 +295,7 @@ static int pmem_attach_disk(struct device *dev,
disk->fops = &pmem_fops;
disk->queue = q;
- disk->flags = GENHD_FL_EXT_DEVT;
+ disk->flags = GENHD_FL_EXT_DEVT | GENHD_FL_DAX;
nvdimm_namespace_disk_name(ndns, disk->disk_name);
disk->driverfs_dev = dev;
set_capacity(disk, (pmem->size - pmem->pfn_pad - pmem->data_offset)
diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c
index bed53c4..60b1857 100644
--- a/drivers/s390/block/dcssblk.c
+++ b/drivers/s390/block/dcssblk.c
@@ -616,6 +616,7 @@ dcssblk_add_store(struct device *dev, struct device_attribute *attr, const char
dev_info->gd->queue = dev_info->dcssblk_queue;
dev_info->gd->private_data = dev_info;
dev_info->gd->driverfs_dev = &dev_info->dev;
+ dev_info->gd->flags = GENHD_FL_DAX;
blk_queue_make_request(dev_info->dcssblk_queue, dcssblk_make_request);
blk_queue_logical_block_size(dev_info->dcssblk_queue, 4096);
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 359a8e4..9dc3a3d 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -131,7 +131,7 @@ struct hd_struct {
};
#define GENHD_FL_REMOVABLE 1
-/* 2 is unused */
+#define GENHD_FL_DAX 2
#define GENHD_FL_MEDIA_CHANGE_NOTIFY 4
#define GENHD_FL_CD 8
#define GENHD_FL_UP 16
next prev parent reply other threads:[~2016-06-13 22:32 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-13 22:21 [PATCH 0/6] Support DAX for device-mapper dm-linear devices Toshi Kani
2016-06-13 22:21 ` Toshi Kani [this message]
2016-06-13 22:21 ` [PATCH 2/6] block: Check GENHD_FL_DAX for DAX capability Toshi Kani
2016-06-13 22:21 ` [PATCH 3/6] dm: Add dm_blk_direct_access() for mapped device Toshi Kani
2016-06-13 22:21 ` [PATCH 4/6] dm-linear: Add linear_direct_access() Toshi Kani
2016-06-13 22:21 ` [PATCH 5/6] dm, dm-linear: Add dax_supported to dm_target Toshi Kani
2016-06-13 22:21 ` [PATCH 6/6] dm: Enable DAX support for mapper device Toshi Kani
2016-06-13 22:57 ` [PATCH 0/6] Support DAX for device-mapper dm-linear devices Mike Snitzer
2016-06-20 18:00 ` Mike Snitzer
2016-06-20 18:31 ` Kani, Toshimitsu
2016-06-20 19:40 ` Mike Snitzer
2016-06-20 19:52 ` Mike Snitzer
2016-06-20 20:11 ` Kani, Toshimitsu
2016-06-20 21:28 ` Kani, Toshimitsu
2016-06-20 22:22 ` Mike Snitzer
2016-06-21 13:41 ` Mike Snitzer
2016-06-21 15:44 ` Kani, Toshimitsu
2016-06-21 15:50 ` Kani, Toshimitsu
2016-06-21 16:25 ` Dan Williams
2016-06-21 16:35 ` Kani, Toshimitsu
2016-06-21 16:45 ` Dan Williams
2016-06-21 16:56 ` Kani, Toshimitsu
2016-06-21 18:17 ` Mike Snitzer
2016-06-22 17:44 ` Kani, Toshimitsu
2016-06-22 19:15 ` Dan Williams
2016-06-22 20:16 ` Kani, Toshimitsu
2016-06-22 22:38 ` Mike Snitzer
2016-06-22 22:59 ` Kani, Toshimitsu
2016-06-13 23:18 ` Dan Williams
2016-06-13 23:59 ` Kani, Toshimitsu
2016-06-14 0:02 ` Dan Williams
2016-06-14 7:30 ` Dan Williams
2016-06-14 13:50 ` Jeff Moyer
2016-06-14 15:41 ` Mike Snitzer
2016-06-14 18:00 ` Kani, Toshimitsu
2016-06-14 20:19 ` Jeff Moyer
2016-06-15 1:46 ` Mike Snitzer
2016-06-15 2:07 ` Dan Williams
2016-06-15 2:35 ` Mike Snitzer
2016-06-14 15:53 ` Kani, Toshimitsu
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