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199a31c6 CH |
1 | #ifndef LINUX_IOMAP_H |
2 | #define LINUX_IOMAP_H 1 | |
3 | ||
4 | #include <linux/types.h> | |
5 | ||
8be9f564 | 6 | struct fiemap_extent_info; |
ae259a9c CH |
7 | struct inode; |
8 | struct iov_iter; | |
9 | struct kiocb; | |
10 | struct vm_area_struct; | |
11 | struct vm_fault; | |
12 | ||
13 | /* | |
14 | * Types of block ranges for iomap mappings: | |
15 | */ | |
199a31c6 CH |
16 | #define IOMAP_HOLE 0x01 /* no blocks allocated, need allocation */ |
17 | #define IOMAP_DELALLOC 0x02 /* delayed allocation blocks */ | |
18 | #define IOMAP_MAPPED 0x03 /* blocks allocated @blkno */ | |
19 | #define IOMAP_UNWRITTEN 0x04 /* blocks allocated @blkno in unwritten state */ | |
20 | ||
17de0a9f | 21 | /* |
d33fd776 | 22 | * Flags for all iomap mappings: |
17de0a9f | 23 | */ |
d33fd776 CH |
24 | #define IOMAP_F_NEW 0x01 /* blocks have been newly allocated */ |
25 | ||
26 | /* | |
27 | * Flags that only need to be reported for IOMAP_REPORT requests: | |
28 | */ | |
29 | #define IOMAP_F_MERGED 0x10 /* contains multiple blocks/extents */ | |
30 | #define IOMAP_F_SHARED 0x20 /* block shared with another file */ | |
17de0a9f | 31 | |
ae259a9c CH |
32 | /* |
33 | * Magic value for blkno: | |
34 | */ | |
199a31c6 CH |
35 | #define IOMAP_NULL_BLOCK -1LL /* blkno is not valid */ |
36 | ||
37 | struct iomap { | |
ae259a9c CH |
38 | sector_t blkno; /* 1st sector of mapping, 512b units */ |
39 | loff_t offset; /* file offset of mapping, bytes */ | |
40 | u64 length; /* length of mapping, bytes */ | |
17de0a9f CH |
41 | u16 type; /* type of mapping */ |
42 | u16 flags; /* flags for mapping */ | |
ae259a9c CH |
43 | struct block_device *bdev; /* block device for I/O */ |
44 | }; | |
45 | ||
46 | /* | |
47 | * Flags for iomap_begin / iomap_end. No flag implies a read. | |
48 | */ | |
d33fd776 CH |
49 | #define IOMAP_WRITE (1 << 0) /* writing, must allocate blocks */ |
50 | #define IOMAP_ZERO (1 << 1) /* zeroing operation, may skip holes */ | |
51 | #define IOMAP_REPORT (1 << 2) /* report extent status, e.g. FIEMAP */ | |
9484ab1b | 52 | #define IOMAP_FAULT (1 << 3) /* mapping for page fault */ |
ff6a9292 | 53 | #define IOMAP_DIRECT (1 << 4) /* direct I/O */ |
ae259a9c CH |
54 | |
55 | struct iomap_ops { | |
56 | /* | |
57 | * Return the existing mapping at pos, or reserve space starting at | |
58 | * pos for up to length, as long as we can do it as a single mapping. | |
59 | * The actual length is returned in iomap->length. | |
60 | */ | |
61 | int (*iomap_begin)(struct inode *inode, loff_t pos, loff_t length, | |
62 | unsigned flags, struct iomap *iomap); | |
63 | ||
64 | /* | |
65 | * Commit and/or unreserve space previous allocated using iomap_begin. | |
66 | * Written indicates the length of the successful write operation which | |
67 | * needs to be commited, while the rest needs to be unreserved. | |
68 | * Written might be zero if no data was written. | |
69 | */ | |
70 | int (*iomap_end)(struct inode *inode, loff_t pos, loff_t length, | |
71 | ssize_t written, unsigned flags, struct iomap *iomap); | |
199a31c6 CH |
72 | }; |
73 | ||
ae259a9c CH |
74 | ssize_t iomap_file_buffered_write(struct kiocb *iocb, struct iov_iter *from, |
75 | struct iomap_ops *ops); | |
5f4e5752 CH |
76 | int iomap_file_dirty(struct inode *inode, loff_t pos, loff_t len, |
77 | struct iomap_ops *ops); | |
ae259a9c CH |
78 | int iomap_zero_range(struct inode *inode, loff_t pos, loff_t len, |
79 | bool *did_zero, struct iomap_ops *ops); | |
80 | int iomap_truncate_page(struct inode *inode, loff_t pos, bool *did_zero, | |
81 | struct iomap_ops *ops); | |
82 | int iomap_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf, | |
83 | struct iomap_ops *ops); | |
8be9f564 CH |
84 | int iomap_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
85 | loff_t start, loff_t len, struct iomap_ops *ops); | |
ae259a9c | 86 | |
ff6a9292 CH |
87 | /* |
88 | * Flags for direct I/O ->end_io: | |
89 | */ | |
90 | #define IOMAP_DIO_UNWRITTEN (1 << 0) /* covers unwritten extent(s) */ | |
91 | #define IOMAP_DIO_COW (1 << 1) /* covers COW extent(s) */ | |
92 | typedef int (iomap_dio_end_io_t)(struct kiocb *iocb, ssize_t ret, | |
93 | unsigned flags); | |
94 | ssize_t iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter, | |
95 | struct iomap_ops *ops, iomap_dio_end_io_t end_io); | |
96 | ||
199a31c6 | 97 | #endif /* LINUX_IOMAP_H */ |