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
9struct 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
14ssize_t iomap_dax_rw(struct kiocb *iocb, struct iov_iter *iter,
15 struct iomap_ops *ops);
16ssize_t dax_do_io(struct kiocb *, struct inode *, struct iov_iter *,
17 get_block_t, dio_iodone_t, int flags);
18int dax_zero_page_range(struct inode *, loff_t from, unsigned len, get_block_t);
19int dax_truncate_page(struct inode *, loff_t from, get_block_t);
20int iomap_dax_fault(struct vm_area_struct *vma, struct vm_fault *vmf,
21 struct iomap_ops *ops);
22int dax_fault(struct vm_area_struct *, struct vm_fault *, get_block_t);
23int dax_delete_mapping_entry(struct address_space *mapping, pgoff_t index);
24void dax_wake_mapping_entry_waiter(struct address_space *mapping,
25 pgoff_t index, bool wake_all);
26
27#ifdef CONFIG_FS_DAX
28struct page *read_dax_sector(struct block_device *bdev, sector_t n);
29void dax_unlock_mapping_entry(struct address_space *mapping, pgoff_t index);
30int __dax_zero_page_range(struct block_device *bdev, sector_t sector,
31 unsigned int offset, unsigned int length);
32#else
33static 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. */
39static inline void dax_unlock_mapping_entry(struct address_space *mapping,
40 pgoff_t index)
41{
42 BUG();
43}
44static 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)
52int dax_pmd_fault(struct vm_area_struct *, unsigned long addr, pmd_t *,
53 unsigned int flags, get_block_t);
54#else
55static 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
61int dax_pfn_mkwrite(struct vm_area_struct *, struct vm_fault *);
62#define dax_mkwrite(vma, vmf, gb) dax_fault(vma, vmf, gb)
63
64static 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
69static inline bool dax_mapping(struct address_space *mapping)
70{
71 return mapping->host && IS_DAX(mapping->host);
72}
73
74struct writeback_control;
75int dax_writeback_mapping_range(struct address_space *mapping,
76 struct block_device *bdev, struct writeback_control *wbc);
77#endif