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authorLinus Torvalds <torvalds@linux-foundation.org>2019-05-25 19:11:23 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2019-05-25 19:11:23 +0200
commitb2ad81363f12261f8b6a97ed7723960ea6450f31 (patch)
treedd6a3fd40afb8e962cf572504bf43033b2442044 /drivers/md/dm.c
parentMerge tag 'trace-v5.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/r... (diff)
parentlibnvdimm/pmem: Bypass CONFIG_HARDENED_USERCOPY overhead (diff)
downloadlinux-b2ad81363f12261f8b6a97ed7723960ea6450f31.tar.xz
linux-b2ad81363f12261f8b6a97ed7723960ea6450f31.zip
Merge tag 'libnvdimm-fixes-5.2-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm
Pull libnvdimm fixes from Dan Williams: - Fix a regression that disabled device-mapper dax support - Remove unnecessary hardened-user-copy overhead (>30%) for dax read(2)/write(2). - Fix some compilation warnings. * tag 'libnvdimm-fixes-5.2-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm: libnvdimm/pmem: Bypass CONFIG_HARDENED_USERCOPY overhead dax: Arrange for dax_supported check to span multiple devices libnvdimm: Fix compilation warnings with W=1
Diffstat (limited to 'drivers/md/dm.c')
-rw-r--r--drivers/md/dm.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 997385c1ca54..5475081dcbd6 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1107,6 +1107,25 @@ static long dm_dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff,
return ret;
}
+static bool dm_dax_supported(struct dax_device *dax_dev, struct block_device *bdev,
+ int blocksize, sector_t start, sector_t len)
+{
+ struct mapped_device *md = dax_get_private(dax_dev);
+ struct dm_table *map;
+ int srcu_idx;
+ bool ret;
+
+ map = dm_get_live_table(md, &srcu_idx);
+ if (!map)
+ return false;
+
+ ret = dm_table_supports_dax(map, blocksize);
+
+ dm_put_live_table(md, srcu_idx);
+
+ return ret;
+}
+
static size_t dm_dax_copy_from_iter(struct dax_device *dax_dev, pgoff_t pgoff,
void *addr, size_t bytes, struct iov_iter *i)
{
@@ -3194,6 +3213,7 @@ static const struct block_device_operations dm_blk_dops = {
static const struct dax_operations dm_dax_ops = {
.direct_access = dm_dax_direct_access,
+ .dax_supported = dm_dax_supported,
.copy_from_iter = dm_dax_copy_from_iter,
.copy_to_iter = dm_dax_copy_to_iter,
};