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_delete_mapping_entry(struct address_space *mapping, pgoff_t index);
18void dax_wake_mapping_entry_waiter(struct address_space *mapping,
19 pgoff_t index, bool wake_all);
20
21#ifdef CONFIG_FS_DAX
22struct page *read_dax_sector(struct block_device *bdev, sector_t n);
23void dax_unlock_mapping_entry(struct address_space *mapping, pgoff_t index);
24int __dax_zero_page_range(struct block_device *bdev, sector_t sector,
25 unsigned int offset, unsigned int length);
26#else
27static 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. */
33static inline void dax_unlock_mapping_entry(struct address_space *mapping,
34 pgoff_t index)
35{
36 BUG();
37}
38static 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)
46int dax_pmd_fault(struct vm_area_struct *, unsigned long addr, pmd_t *,
47 unsigned int flags, get_block_t);
48#else
49static 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
55int dax_pfn_mkwrite(struct vm_area_struct *, struct vm_fault *);
56#define dax_mkwrite(vma, vmf, gb) dax_fault(vma, vmf, gb)
57
58static 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
63static inline bool dax_mapping(struct address_space *mapping)
64{
65 return mapping->host && IS_DAX(mapping->host);
66}
67
68struct writeback_control;
69int dax_writeback_mapping_range(struct address_space *mapping,
70 struct block_device *bdev, struct writeback_control *wbc);
71#endif