diff options
| author |   Christoph Hellwig <hch@lst.de> | 2016-05-09 10:47:04 +0200 |
|---|---|---|
| committer |   Vishal Verma <vishal.l.verma@intel.com> | 2016-05-18 12:16:56 -0600 |
| commit | 679c8bd3b29428e736eabb7fc66a978f312f0c86 (patch) | |
| tree | cf8a07f8da720780335f995d6a8d2faf202d7875 /include/linux/dax.h | |
| parent | dax: use sb_issue_zerout instead of calling dax_clear_sectors (diff) | |
| download | linux-dev-679c8bd3b29428e736eabb7fc66a978f312f0c86.tar.xz linux-dev-679c8bd3b29428e736eabb7fc66a978f312f0c86.zip | |
dax: export a low-level __dax_zero_page_range helper
This allows XFS to perform zeroing using the iomap infrastructure and
avoid buffer heads.
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christoph Hellwig <hch@lst.de>
[vishal: fix conflicts with dax-error-handling]
Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
Diffstat (limited to 'include/linux/dax.h')
| -rw-r--r-- | include/linux/dax.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/dax.h b/include/linux/dax.h index 7f853ffaa987..90fbc99e5313 100644 --- a/include/linux/dax.h +++ b/include/linux/dax.h @@ -14,12 +14,19 @@ int __dax_fault(struct vm_area_struct *, struct vm_fault *, get_block_t); #ifdef CONFIG_FS_DAX struct page *read_dax_sector(struct block_device *bdev, sector_t n); +int __dax_zero_page_range(struct block_device *bdev, sector_t sector, + unsigned int offset, unsigned int length); #else static inline struct page *read_dax_sector(struct block_device *bdev, sector_t n) { return ERR_PTR(-ENXIO); } +static inline int __dax_zero_page_range(struct block_device *bdev, + sector_t sector, unsigned int offset, unsigned int length) +{ + return -ENXIO; +} #endif #ifdef CONFIG_TRANSPARENT_HUGEPAGE |