6 #include <linux/radix-tree.h>
7 #include <asm/pgtable.h>
9 /* We use lowest available exceptional entry bit for locking */
10 #define RADIX_DAX_ENTRY_LOCK (1 << RADIX_TREE_EXCEPTIONAL_SHIFT)
12 ssize_t dax_do_io(struct kiocb *, struct inode *, struct iov_iter *,
13 get_block_t, dio_iodone_t, int flags);
14 int dax_zero_page_range(struct inode *, loff_t from, unsigned len, get_block_t);
15 int dax_truncate_page(struct inode *, loff_t from, get_block_t);
16 int dax_fault(struct vm_area_struct *, struct vm_fault *, get_block_t);
17 int dax_delete_mapping_entry(struct address_space *mapping, pgoff_t index);
18 void dax_wake_mapping_entry_waiter(struct address_space *mapping,
19 pgoff_t index, bool wake_all);
22 struct page *read_dax_sector(struct block_device *bdev, sector_t n);
23 void dax_unlock_mapping_entry(struct address_space *mapping, pgoff_t index);
24 int __dax_zero_page_range(struct block_device *bdev, sector_t sector,
25 unsigned int offset, unsigned int length);
27 static inline struct page *read_dax_sector(struct block_device *bdev,
30 return ERR_PTR(-ENXIO);
32 /* Shouldn't ever be called when dax is disabled. */
33 static inline void dax_unlock_mapping_entry(struct address_space *mapping,
38 static inline int __dax_zero_page_range(struct block_device *bdev,
39 sector_t sector, unsigned int offset, unsigned int length)
45 #if defined(CONFIG_TRANSPARENT_HUGEPAGE)
46 int dax_pmd_fault(struct vm_area_struct *, unsigned long addr, pmd_t *,
47 unsigned int flags, get_block_t);
49 static inline int dax_pmd_fault(struct vm_area_struct *vma, unsigned long addr,
50 pmd_t *pmd, unsigned int flags, get_block_t gb)
52 return VM_FAULT_FALLBACK;
55 int dax_pfn_mkwrite(struct vm_area_struct *, struct vm_fault *);
56 #define dax_mkwrite(vma, vmf, gb) dax_fault(vma, vmf, gb)
58 static inline bool vma_is_dax(struct vm_area_struct *vma)
60 return vma->vm_file && IS_DAX(vma->vm_file->f_mapping->host);
63 static inline bool dax_mapping(struct address_space *mapping)
65 return mapping->host && IS_DAX(mapping->host);
68 struct writeback_control;
69 int dax_writeback_mapping_range(struct address_space *mapping,
70 struct block_device *bdev, struct writeback_control *wbc);