| | 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 |
projects / mirror_ubuntu-zesty-kernel.git / blame_incremental