include/linux/dax.h

   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 *,
   9                   get_block_t, dio_iodone_t, int flags);
  10 int dax_zero_page_range(struct inode *, loff_t from, unsigned len, get_block_t);
  11 int dax_truncate_page(struct inode *, loff_t from, get_block_t);
  12 int dax_fault(struct vm_area_struct *, struct vm_fault *, get_block_t);
  13 int __dax_fault(struct vm_area_struct *, struct vm_fault *, get_block_t);
  14
  15 #ifdef CONFIG_FS_DAX
  16 struct page *read_dax_sector(struct block_device *bdev, sector_t n);
  17 int __dax_zero_page_range(struct block_device *bdev, sector_t sector,
  18                 unsigned int offset, unsigned int length);
  19 #else
  20 static inline struct page *read_dax_sector(struct block_device *bdev,
  21                 sector_t n)
  22 {
  23         return ERR_PTR(-ENXIO);
  24 }
  25 static inline int __dax_zero_page_range(struct block_device *bdev,
  26                 sector_t sector, unsigned int offset, unsigned int length)
  27 {
  28         return -ENXIO;
  29 }
  30 #endif
  31
  32 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
  33 int dax_pmd_fault(struct vm_area_struct *, unsigned long addr, pmd_t *,
  34                                 unsigned int flags, get_block_t);
  35 int __dax_pmd_fault(struct vm_area_struct *, unsigned long addr, pmd_t *,
  36                                 unsigned int flags, get_block_t);
  37 #else
  38 static inline int dax_pmd_fault(struct vm_area_struct *vma, unsigned long addr,
  39                                 pmd_t *pmd, unsigned int flags, get_block_t gb)
  40 {
  41         return VM_FAULT_FALLBACK;
  42 }
  43 #define __dax_pmd_fault dax_pmd_fault
  44 #endif
  45 int dax_pfn_mkwrite(struct vm_area_struct *, struct vm_fault *);
  46 #define dax_mkwrite(vma, vmf, gb)       dax_fault(vma, vmf, gb)
  47 #define __dax_mkwrite(vma, vmf, gb)     __dax_fault(vma, vmf, gb)
  48
  49 static inline bool vma_is_dax(struct vm_area_struct *vma)
  50 {
  51         return vma->vm_file && IS_DAX(vma->vm_file->f_mapping->host);
  52 }
  53
  54 static inline bool dax_mapping(struct address_space *mapping)
  55 {
  56         return mapping->host && IS_DAX(mapping->host);
  57 }
  58
  59 struct writeback_control;
  60 int dax_writeback_mapping_range(struct address_space *mapping,
  61                 struct block_device *bdev, struct writeback_control *wbc);
  62 #endif