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| author | Dan Williams <dan.j.williams@intel.com> | 2016-01-28 20:25:31 -0800 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2016-01-30 13:35:32 -0800 |
| commit | d1a5f2b4d8a125943dcb6b032fc7eaefc2c78296 (patch) | |
| tree | afdd4251d10cbcf34b00bd4f33adb27996881cc6 /include/linux/dax.h | |
| parent | 9f4736fe7ca804aa79b5916221bb13dfc6221a0f (diff) | |
| download | op-kernel-dev-d1a5f2b4d8a125943dcb6b032fc7eaefc2c78296.zip op-kernel-dev-d1a5f2b4d8a125943dcb6b032fc7eaefc2c78296.tar.gz | |
block: use DAX for partition table reads
Avoid populating pagecache when the block device is in DAX mode.
Otherwise these page cache entries collide with the fsync/msync
implementation and break data durability guarantees.
Cc: Jan Kara <jack@suse.com>
Cc: Jeff Moyer <jmoyer@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Reported-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Tested-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Reviewed-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'include/linux/dax.h')
| -rw-r--r-- | include/linux/dax.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/dax.h b/include/linux/dax.h index 8204c3d..818e450 100644 --- a/include/linux/dax.h +++ b/include/linux/dax.h @@ -14,6 +14,17 @@ int dax_fault(struct vm_area_struct *, struct vm_fault *, get_block_t, dax_iodone_t); int __dax_fault(struct vm_area_struct *, struct vm_fault *, get_block_t, dax_iodone_t); + +#ifdef CONFIG_FS_DAX +struct page *read_dax_sector(struct block_device *bdev, sector_t n); +#else +static inline struct page *read_dax_sector(struct block_device *bdev, + sector_t n) +{ + return ERR_PTR(-ENXIO); +} +#endif + #ifdef CONFIG_TRANSPARENT_HUGEPAGE int dax_pmd_fault(struct vm_area_struct *, unsigned long addr, pmd_t *, unsigned int flags, get_block_t, dax_iodone_t); |
