Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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
12ssize_t dax_do_io(struct kiocb *, struct inode *, struct iov_iter *,
13 get_block_t, dio_iodone_t, int flags);
14int dax_zero_page_range(struct inode *, loff_t from, unsigned len, get_block_t);
15int dax_truncate_page(struct inode *, loff_t from, get_block_t);
16int dax_fault(struct vm_area_struct *, struct vm_fault *, get_block_t);
17int __dax_fault(struct vm_area_struct *, struct vm_fault *, get_block_t);
18int dax_delete_mapping_entry(struct address_space *mapping, pgoff_t index);
19void dax_wake_mapping_entry_waiter(struct address_space *mapping,
20 pgoff_t index, bool wake_all);
21
22#ifdef CONFIG_FS_DAX
23struct page *read_dax_sector(struct block_device *bdev, sector_t n);
24void dax_unlock_mapping_entry(struct address_space *mapping, pgoff_t index);
25int __dax_zero_page_range(struct block_device *bdev, sector_t sector,
26 unsigned int offset, unsigned int length);
27#else
28static inline struct page *read_dax_sector(struct block_device *bdev,
29 sector_t n)
30{
31 return ERR_PTR(-ENXIO);
32}
33/* Shouldn't ever be called when dax is disabled. */
34static inline void dax_unlock_mapping_entry(struct address_space *mapping,
35 pgoff_t index)
36{
37 BUG();
38}
39static inline int __dax_zero_page_range(struct block_device *bdev,
40 sector_t sector, unsigned int offset, unsigned int length)
41{
42 return -ENXIO;
43}
44#endif
45
46#if defined(CONFIG_TRANSPARENT_HUGEPAGE)
47int dax_pmd_fault(struct vm_area_struct *, unsigned long addr, pmd_t *,
48 unsigned int flags, get_block_t);
49int __dax_pmd_fault(struct vm_area_struct *, unsigned long addr, pmd_t *,
50 unsigned int flags, get_block_t);
51#else
52static inline int dax_pmd_fault(struct vm_area_struct *vma, unsigned long addr,
53 pmd_t *pmd, unsigned int flags, get_block_t gb)
54{
55 return VM_FAULT_FALLBACK;
56}
57#define __dax_pmd_fault dax_pmd_fault
58#endif
59int dax_pfn_mkwrite(struct vm_area_struct *, struct vm_fault *);
60#define dax_mkwrite(vma, vmf, gb) dax_fault(vma, vmf, gb)
61#define __dax_mkwrite(vma, vmf, gb) __dax_fault(vma, vmf, gb)
62
63static inline bool vma_is_dax(struct vm_area_struct *vma)
64{
65 return vma->vm_file && IS_DAX(vma->vm_file->f_mapping->host);
66}
67
68static inline bool dax_mapping(struct address_space *mapping)
69{
70 return mapping->host && IS_DAX(mapping->host);
71}
72
73struct writeback_control;
74int dax_writeback_mapping_range(struct address_space *mapping,
75 struct block_device *bdev, struct writeback_control *wbc);
76#endif