1 #ifndef _LINUX_DAX_H 2 #define _LINUX_DAX_H 3 4 #include <linux/fs.h> 5 #include <linux/mm.h> 6 #include <asm/pgtable.h> 7 8 ssize_t dax_do_io(struct kiocb *, struct inode *, struct iov_iter *, loff_t, 9 get_block_t, dio_iodone_t, int flags); 10 int dax_clear_sectors(struct block_device *bdev, sector_t _sector, long _size); 11 int dax_zero_page_range(struct inode *, loff_t from, unsigned len, get_block_t); 12 int dax_truncate_page(struct inode *, loff_t from, get_block_t); 13 int dax_fault(struct vm_area_struct *, struct vm_fault *, get_block_t, 14 dax_iodone_t); 15 int __dax_fault(struct vm_area_struct *, struct vm_fault *, get_block_t, 16 dax_iodone_t); 17 18 #ifdef CONFIG_FS_DAX 19 struct page *read_dax_sector(struct block_device *bdev, sector_t n); 20 #else 21 static inline struct page *read_dax_sector(struct block_device *bdev, 22 sector_t n) 23 { 24 return ERR_PTR(-ENXIO); 25 } 26 #endif 27 28 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 29 int dax_pmd_fault(struct vm_area_struct *, unsigned long addr, pmd_t *, 30 unsigned int flags, get_block_t, dax_iodone_t); 31 int __dax_pmd_fault(struct vm_area_struct *, unsigned long addr, pmd_t *, 32 unsigned int flags, get_block_t, dax_iodone_t); 33 #else 34 static inline int dax_pmd_fault(struct vm_area_struct *vma, unsigned long addr, 35 pmd_t *pmd, unsigned int flags, get_block_t gb, 36 dax_iodone_t di) 37 { 38 return VM_FAULT_FALLBACK; 39 } 40 #define __dax_pmd_fault dax_pmd_fault 41 #endif 42 int dax_pfn_mkwrite(struct vm_area_struct *, struct vm_fault *); 43 #define dax_mkwrite(vma, vmf, gb, iod) dax_fault(vma, vmf, gb, iod) 44 #define __dax_mkwrite(vma, vmf, gb, iod) __dax_fault(vma, vmf, gb, iod) 45 46 static inline bool vma_is_dax(struct vm_area_struct *vma) 47 { 48 return vma->vm_file && IS_DAX(vma->vm_file->f_mapping->host); 49 } 50 51 static inline bool dax_mapping(struct address_space *mapping) 52 { 53 return mapping->host && IS_DAX(mapping->host); 54 } 55 56 struct writeback_control; 57 int dax_writeback_mapping_range(struct address_space *mapping, 58 struct block_device *bdev, struct writeback_control *wbc); 59 #endif 60