1 #ifndef _LINUX_DAX_H 2 #define _LINUX_DAX_H 3 4 #include <linux/fs.h> 5 #include <linux/mm.h> 6 #include <linux/radix-tree.h> 7 #include <asm/pgtable.h> 8 9 struct iomap_ops; 10 11 /* We use lowest available exceptional entry bit for locking */ 12 #define RADIX_DAX_ENTRY_LOCK (1 << RADIX_TREE_EXCEPTIONAL_SHIFT) 13 14 ssize_t iomap_dax_rw(struct kiocb *iocb, struct iov_iter *iter, 15 struct iomap_ops *ops); 16 ssize_t dax_do_io(struct kiocb *, struct inode *, struct iov_iter *, 17 get_block_t, dio_iodone_t, int flags); 18 int dax_zero_page_range(struct inode *, loff_t from, unsigned len, get_block_t); 19 int dax_truncate_page(struct inode *, loff_t from, get_block_t); 20 int iomap_dax_fault(struct vm_area_struct *vma, struct vm_fault *vmf, 21 struct iomap_ops *ops); 22 int dax_fault(struct vm_area_struct *, struct vm_fault *, get_block_t); 23 int dax_delete_mapping_entry(struct address_space *mapping, pgoff_t index); 24 void dax_wake_mapping_entry_waiter(struct address_space *mapping, 25 pgoff_t index, bool wake_all); 26 27 #ifdef CONFIG_FS_DAX 28 struct page *read_dax_sector(struct block_device *bdev, sector_t n); 29 void dax_unlock_mapping_entry(struct address_space *mapping, pgoff_t index); 30 int __dax_zero_page_range(struct block_device *bdev, sector_t sector, 31 unsigned int offset, unsigned int length); 32 #else 33 static inline struct page *read_dax_sector(struct block_device *bdev, 34 sector_t n) 35 { 36 return ERR_PTR(-ENXIO); 37 } 38 /* Shouldn't ever be called when dax is disabled. */ 39 static inline void dax_unlock_mapping_entry(struct address_space *mapping, 40 pgoff_t index) 41 { 42 BUG(); 43 } 44 static inline int __dax_zero_page_range(struct block_device *bdev, 45 sector_t sector, unsigned int offset, unsigned int length) 46 { 47 return -ENXIO; 48 } 49 #endif 50 51 #if defined(CONFIG_TRANSPARENT_HUGEPAGE) 52 int dax_pmd_fault(struct vm_area_struct *, unsigned long addr, pmd_t *, 53 unsigned int flags, get_block_t); 54 #else 55 static inline int dax_pmd_fault(struct vm_area_struct *vma, unsigned long addr, 56 pmd_t *pmd, unsigned int flags, get_block_t gb) 57 { 58 return VM_FAULT_FALLBACK; 59 } 60 #endif 61 int dax_pfn_mkwrite(struct vm_area_struct *, struct vm_fault *); 62 #define dax_mkwrite(vma, vmf, gb) dax_fault(vma, vmf, gb) 63 64 static inline bool vma_is_dax(struct vm_area_struct *vma) 65 { 66 return vma->vm_file && IS_DAX(vma->vm_file->f_mapping->host); 67 } 68 69 static inline bool dax_mapping(struct address_space *mapping) 70 { 71 return mapping->host && IS_DAX(mapping->host); 72 } 73 74 struct writeback_control; 75 int dax_writeback_mapping_range(struct address_space *mapping, 76 struct block_device *bdev, struct writeback_control *wbc); 77 #endif 78