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authorLinus Torvalds <torvalds@linux-foundation.org>2019-05-25 10:11:23 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2019-05-25 10:11:23 -0700
commitb2ad81363f12261f8b6a97ed7723960ea6450f31 (patch)
treedd6a3fd40afb8e962cf572504bf43033b2442044 /include
parenta2c48d98fc0770f7993cf61c71659a99e1d2857e (diff)
parent52f476a323f9efc959be1c890d0cdcf12e1582e0 (diff)
downloadlinux-b2ad81363f12261f8b6a97ed7723960ea6450f31.tar.bz2
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 'include')
-rw-r--r--include/linux/dax.h26
1 files changed, 26 insertions, 0 deletions
diff --git a/include/linux/dax.h b/include/linux/dax.h
index 0dd316a74a29..becaea5f4488 100644
--- a/include/linux/dax.h
+++ b/include/linux/dax.h
@@ -19,6 +19,12 @@ struct dax_operations {
*/
long (*direct_access)(struct dax_device *, pgoff_t, long,
void **, pfn_t *);
+ /*
+ * Validate whether this device is usable as an fsdax backing
+ * device.
+ */
+ bool (*dax_supported)(struct dax_device *, struct block_device *, int,
+ sector_t, sector_t);
/* copy_from_iter: required operation for fs-dax direct-i/o */
size_t (*copy_from_iter)(struct dax_device *, pgoff_t, void *, size_t,
struct iov_iter *);
@@ -75,6 +81,17 @@ static inline bool bdev_dax_supported(struct block_device *bdev, int blocksize)
return __bdev_dax_supported(bdev, blocksize);
}
+bool __generic_fsdax_supported(struct dax_device *dax_dev,
+ struct block_device *bdev, int blocksize, sector_t start,
+ sector_t sectors);
+static inline bool generic_fsdax_supported(struct dax_device *dax_dev,
+ struct block_device *bdev, int blocksize, sector_t start,
+ sector_t sectors)
+{
+ return __generic_fsdax_supported(dax_dev, bdev, blocksize, start,
+ sectors);
+}
+
static inline struct dax_device *fs_dax_get_by_host(const char *host)
{
return dax_get_by_host(host);
@@ -99,6 +116,13 @@ static inline bool bdev_dax_supported(struct block_device *bdev,
return false;
}
+static inline bool generic_fsdax_supported(struct dax_device *dax_dev,
+ struct block_device *bdev, int blocksize, sector_t start,
+ sector_t sectors)
+{
+ return false;
+}
+
static inline struct dax_device *fs_dax_get_by_host(const char *host)
{
return NULL;
@@ -142,6 +166,8 @@ bool dax_alive(struct dax_device *dax_dev);
void *dax_get_private(struct dax_device *dax_dev);
long dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff, long nr_pages,
void **kaddr, pfn_t *pfn);
+bool dax_supported(struct dax_device *dax_dev, struct block_device *bdev,
+ int blocksize, sector_t start, sector_t len);
size_t dax_copy_from_iter(struct dax_device *dax_dev, pgoff_t pgoff, void *addr,
size_t bytes, struct iov_iter *i);
size_t dax_copy_to_iter(struct dax_device *dax_dev, pgoff_t pgoff, void *addr,