blob: 9c6dc77040434c52a0091a6a720fd055f4c618a2 [file] [log] [blame]
Matthew Wilcoxc94c2ac2015-09-08 14:58:40 -07001#ifndef _LINUX_DAX_H
2#define _LINUX_DAX_H
3
4#include <linux/fs.h>
5#include <linux/mm.h>
Jan Kara4f622932016-05-12 18:29:17 +02006#include <linux/radix-tree.h>
Matthew Wilcoxc94c2ac2015-09-08 14:58:40 -07007#include <asm/pgtable.h>
8
Jan Karae8043152016-05-12 18:29:16 +02009/* We use lowest available exceptional entry bit for locking */
10#define RADIX_DAX_ENTRY_LOCK (1 << RADIX_TREE_EXCEPTIONAL_SHIFT)
11
Christoph Hellwigc8b8e322016-04-07 08:51:58 -070012ssize_t dax_do_io(struct kiocb *, struct inode *, struct iov_iter *,
Matthew Wilcoxc94c2ac2015-09-08 14:58:40 -070013 get_block_t, dio_iodone_t, int flags);
Matthew Wilcoxc94c2ac2015-09-08 14:58:40 -070014int 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);
Jan Kara02fbd132016-05-11 11:58:48 +020016int dax_fault(struct vm_area_struct *, struct vm_fault *, get_block_t);
Jan Karaac401cc2016-05-12 18:29:18 +020017int 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);
Dan Williamsd1a5f2b42016-01-28 20:25:31 -080020
21#ifdef CONFIG_FS_DAX
22struct page *read_dax_sector(struct block_device *bdev, sector_t n);
Jan Karabc2466e2016-05-12 18:29:19 +020023void dax_unlock_mapping_entry(struct address_space *mapping, pgoff_t index);
Christoph Hellwig679c8bd2016-05-09 10:47:04 +020024int __dax_zero_page_range(struct block_device *bdev, sector_t sector,
25 unsigned int offset, unsigned int length);
Dan Williamsd1a5f2b42016-01-28 20:25:31 -080026#else
27static inline struct page *read_dax_sector(struct block_device *bdev,
28 sector_t n)
29{
30 return ERR_PTR(-ENXIO);
31}
Jan Karabc2466e2016-05-12 18:29:19 +020032/* 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}
Christoph Hellwig679c8bd2016-05-09 10:47:04 +020038static 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 Williamsd1a5f2b42016-01-28 20:25:31 -080043#endif
44
Jan Kara348e9672016-05-12 18:29:15 +020045#if defined(CONFIG_TRANSPARENT_HUGEPAGE)
Matthew Wilcox844f35d2015-09-08 14:58:57 -070046int dax_pmd_fault(struct vm_area_struct *, unsigned long addr, pmd_t *,
Jan Kara02fbd132016-05-11 11:58:48 +020047 unsigned int flags, get_block_t);
Matthew Wilcox844f35d2015-09-08 14:58:57 -070048#else
49static inline int dax_pmd_fault(struct vm_area_struct *vma, unsigned long addr,
Jan Kara02fbd132016-05-11 11:58:48 +020050 pmd_t *pmd, unsigned int flags, get_block_t gb)
Matthew Wilcox844f35d2015-09-08 14:58:57 -070051{
52 return VM_FAULT_FALLBACK;
53}
Matthew Wilcox844f35d2015-09-08 14:58:57 -070054#endif
Matthew Wilcoxc94c2ac2015-09-08 14:58:40 -070055int dax_pfn_mkwrite(struct vm_area_struct *, struct vm_fault *);
Jan Kara02fbd132016-05-11 11:58:48 +020056#define dax_mkwrite(vma, vmf, gb) dax_fault(vma, vmf, gb)
Matthew Wilcoxc94c2ac2015-09-08 14:58:40 -070057
Matthew Wilcox4897c762015-09-08 14:58:45 -070058static 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 Zwislerf9fe48b2016-01-22 15:10:40 -080062
63static inline bool dax_mapping(struct address_space *mapping)
64{
65 return mapping->host && IS_DAX(mapping->host);
66}
Ross Zwisler7f6d5b52016-02-26 15:19:55 -080067
68struct writeback_control;
69int dax_writeback_mapping_range(struct address_space *mapping,
70 struct block_device *bdev, struct writeback_control *wbc);
Matthew Wilcoxc94c2ac2015-09-08 14:58:40 -070071#endif