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block: remove BLK_DEV_DAX config option

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The functionality for block device DAX was already removed with commit
acc93d30d7 ("Revert "block: enable dax for raw block devices"")

However, we still had a config option hanging around that was always
disabled because it depended on CONFIG_BROKEN.  This config option was
introduced in commit 03cdadb040 ("block: disable block device DAX by
default")

This change reverts that commit, removing the dead config option.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ross Zwisler <[email protected]>
Cc: Dave Hansen <[email protected]>
Acked-by: Dan Williams <[email protected]>
Cc: Jens Axboe <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Ross Zwisler authored and Linus Torvalds committed 2016-08-04 08:50:07 -04:00
1 parent 57c24b2140
commit 99a01cdf9d
2 files changed
+1 -18
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block/Kconfig
-13
View File
@@ -88,19 +88,6 @@ config BLK_DEV_INTEGRITY
T10/SCSI Data Integrity Field or the T13/ATA External Path
Protection. If in doubt, say N.
config BLK_DEV_DAX
bool "Block device DAX support"
depends on FS_DAX
depends on BROKEN
help
When DAX support is available (CONFIG_FS_DAX) raw block
devices can also support direct userspace access to the
storage capacity via MMAP(2) similar to a file on a
DAX-enabled filesystem. However, the DAX I/O-path disables
some standard I/O-statistics, and the MMAP(2) path has some
operational differences due to bypassing the page
cache. If in doubt, say N.
config BLK_DEV_THROTTLING
bool "Block layer bio throttling support"
depends on BLK_CGROUP=y
fs/block_dev.c
+1 -5
View File
@@ -1275,11 +1275,7 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
bdev->bd_disk = disk;
bdev->bd_queue = disk->queue;
bdev->bd_contains = bdev;
if (IS_ENABLED(CONFIG_BLK_DEV_DAX) &&
blk_queue_dax(disk->queue))
bdev->bd_inode->i_flags = S_DAX;
else
bdev->bd_inode->i_flags = 0;
bdev->bd_inode->i_flags = 0;
if (!partno) {
ret = -ENXIO;