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 /* We use lowest available exceptional entry bit for locking */ 10 #define RADIX_DAX_ENTRY_LOCK (1 << RADIX_TREE_EXCEPTIONAL_SHIFT) 11 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); 20 21 #ifdef CONFIG_FS_DAX 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); 26 #else 27 static inline struct page *read_dax_sector(struct block_device *bdev, 28 sector_t n) 29 { 30 return ERR_PTR(-ENXIO); 31 } 32 /* Shouldn't ever be called when dax is disabled. */ 33 static inline void dax_unlock_mapping_entry(struct address_space *mapping, 34 pgoff_t index) 35 { 36 BUG(); 37 } 38 static inline int __dax_zero_page_range(struct block_device *bdev, 39 sector_t sector, unsigned int offset, unsigned int length) 40 { 41 return -ENXIO; 42 } 43 #endif 44 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); 48 #else 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) 51 { 52 return VM_FAULT_FALLBACK; 53 } 54 #endif 55 int dax_pfn_mkwrite(struct vm_area_struct *, struct vm_fault *); 56 #define dax_mkwrite(vma, vmf, gb) dax_fault(vma, vmf, gb) 57 58 static inline bool vma_is_dax(struct vm_area_struct *vma) 59 { 60 return vma->vm_file && IS_DAX(vma->vm_file->f_mapping->host); 61 } 62 63 static inline bool dax_mapping(struct address_space *mapping) 64 { 65 return mapping->host && IS_DAX(mapping->host); 66 } 67 68 struct writeback_control; 69 int dax_writeback_mapping_range(struct address_space *mapping, 70 struct block_device *bdev, struct writeback_control *wbc); 71 #endif 72