Matthew Wilcox | c94c2ac | 2015-09-08 14:58:40 -0700 | [diff] [blame] | 1 | #ifndef _LINUX_DAX_H |
| 2 | #define _LINUX_DAX_H |
| 3 | |
| 4 | #include <linux/fs.h> |
| 5 | #include <linux/mm.h> |
Jan Kara | 4f62293 | 2016-05-12 18:29:17 +0200 | [diff] [blame] | 6 | #include <linux/radix-tree.h> |
Matthew Wilcox | c94c2ac | 2015-09-08 14:58:40 -0700 | [diff] [blame] | 7 | #include <asm/pgtable.h> |
| 8 | |
Jan Kara | e804315 | 2016-05-12 18:29:16 +0200 | [diff] [blame] | 9 | /* We use lowest available exceptional entry bit for locking */ |
| 10 | #define RADIX_DAX_ENTRY_LOCK (1 << RADIX_TREE_EXCEPTIONAL_SHIFT) |
| 11 | |
Christoph Hellwig | c8b8e32 | 2016-04-07 08:51:58 -0700 | [diff] [blame] | 12 | ssize_t dax_do_io(struct kiocb *, struct inode *, struct iov_iter *, |
Matthew Wilcox | c94c2ac | 2015-09-08 14:58:40 -0700 | [diff] [blame] | 13 | get_block_t, dio_iodone_t, int flags); |
Matthew Wilcox | c94c2ac | 2015-09-08 14:58:40 -0700 | [diff] [blame] | 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); |
Jan Kara | 02fbd13 | 2016-05-11 11:58:48 +0200 | [diff] [blame] | 16 | int dax_fault(struct vm_area_struct *, struct vm_fault *, get_block_t); |
Jan Kara | ac401cc | 2016-05-12 18:29:18 +0200 | [diff] [blame] | 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); |
Dan Williams | d1a5f2b4 | 2016-01-28 20:25:31 -0800 | [diff] [blame] | 20 | |
| 21 | #ifdef CONFIG_FS_DAX |
| 22 | struct page *read_dax_sector(struct block_device *bdev, sector_t n); |
Jan Kara | bc2466e | 2016-05-12 18:29:19 +0200 | [diff] [blame] | 23 | void dax_unlock_mapping_entry(struct address_space *mapping, pgoff_t index); |
Christoph Hellwig | 679c8bd | 2016-05-09 10:47:04 +0200 | [diff] [blame] | 24 | int __dax_zero_page_range(struct block_device *bdev, sector_t sector, |
| 25 | unsigned int offset, unsigned int length); |
Dan Williams | d1a5f2b4 | 2016-01-28 20:25:31 -0800 | [diff] [blame] | 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 | } |
Jan Kara | bc2466e | 2016-05-12 18:29:19 +0200 | [diff] [blame] | 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 | } |
Christoph Hellwig | 679c8bd | 2016-05-09 10:47:04 +0200 | [diff] [blame] | 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 | } |
Dan Williams | d1a5f2b4 | 2016-01-28 20:25:31 -0800 | [diff] [blame] | 43 | #endif |
| 44 | |
Jan Kara | 348e967 | 2016-05-12 18:29:15 +0200 | [diff] [blame] | 45 | #if defined(CONFIG_TRANSPARENT_HUGEPAGE) |
Matthew Wilcox | 844f35d | 2015-09-08 14:58:57 -0700 | [diff] [blame] | 46 | int dax_pmd_fault(struct vm_area_struct *, unsigned long addr, pmd_t *, |
Jan Kara | 02fbd13 | 2016-05-11 11:58:48 +0200 | [diff] [blame] | 47 | unsigned int flags, get_block_t); |
Matthew Wilcox | 844f35d | 2015-09-08 14:58:57 -0700 | [diff] [blame] | 48 | #else |
| 49 | static inline int dax_pmd_fault(struct vm_area_struct *vma, unsigned long addr, |
Jan Kara | 02fbd13 | 2016-05-11 11:58:48 +0200 | [diff] [blame] | 50 | pmd_t *pmd, unsigned int flags, get_block_t gb) |
Matthew Wilcox | 844f35d | 2015-09-08 14:58:57 -0700 | [diff] [blame] | 51 | { |
| 52 | return VM_FAULT_FALLBACK; |
| 53 | } |
Matthew Wilcox | 844f35d | 2015-09-08 14:58:57 -0700 | [diff] [blame] | 54 | #endif |
Matthew Wilcox | c94c2ac | 2015-09-08 14:58:40 -0700 | [diff] [blame] | 55 | int dax_pfn_mkwrite(struct vm_area_struct *, struct vm_fault *); |
Jan Kara | 02fbd13 | 2016-05-11 11:58:48 +0200 | [diff] [blame] | 56 | #define dax_mkwrite(vma, vmf, gb) dax_fault(vma, vmf, gb) |
Matthew Wilcox | c94c2ac | 2015-09-08 14:58:40 -0700 | [diff] [blame] | 57 | |
Matthew Wilcox | 4897c76 | 2015-09-08 14:58:45 -0700 | [diff] [blame] | 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 | } |
Ross Zwisler | f9fe48b | 2016-01-22 15:10:40 -0800 | [diff] [blame] | 62 | |
| 63 | static inline bool dax_mapping(struct address_space *mapping) |
| 64 | { |
| 65 | return mapping->host && IS_DAX(mapping->host); |
| 66 | } |
Ross Zwisler | 7f6d5b5 | 2016-02-26 15:19:55 -0800 | [diff] [blame] | 67 | |
| 68 | struct writeback_control; |
| 69 | int dax_writeback_mapping_range(struct address_space *mapping, |
| 70 | struct block_device *bdev, struct writeback_control *wbc); |
Matthew Wilcox | c94c2ac | 2015-09-08 14:58:40 -0700 | [diff] [blame] | 71 | #endif |