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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 | ||
ae259a9c CH |
21 | /* |
22 | * Magic value for blkno: | |
23 | */ | |
199a31c6 CH |
24 | #define IOMAP_NULL_BLOCK -1LL /* blkno is not valid */ |
25 | ||
26 | struct iomap { | |
ae259a9c CH |
27 | sector_t blkno; /* 1st sector of mapping, 512b units */ |
28 | loff_t offset; /* file offset of mapping, bytes */ | |
29 | u64 length; /* length of mapping, bytes */ | |
30 | int type; /* type of mapping */ | |
31 | struct block_device *bdev; /* block device for I/O */ | |
32 | }; | |
33 | ||
34 | /* | |
35 | * Flags for iomap_begin / iomap_end. No flag implies a read. | |
36 | */ | |
37 | #define IOMAP_WRITE (1 << 0) | |
38 | #define IOMAP_ZERO (1 << 1) | |
39 | ||
40 | struct iomap_ops { | |
41 | /* | |
42 | * Return the existing mapping at pos, or reserve space starting at | |
43 | * pos for up to length, as long as we can do it as a single mapping. | |
44 | * The actual length is returned in iomap->length. | |
45 | */ | |
46 | int (*iomap_begin)(struct inode *inode, loff_t pos, loff_t length, | |
47 | unsigned flags, struct iomap *iomap); | |
48 | ||
49 | /* | |
50 | * Commit and/or unreserve space previous allocated using iomap_begin. | |
51 | * Written indicates the length of the successful write operation which | |
52 | * needs to be commited, while the rest needs to be unreserved. | |
53 | * Written might be zero if no data was written. | |
54 | */ | |
55 | int (*iomap_end)(struct inode *inode, loff_t pos, loff_t length, | |
56 | ssize_t written, unsigned flags, struct iomap *iomap); | |
199a31c6 CH |
57 | }; |
58 | ||
ae259a9c CH |
59 | ssize_t iomap_file_buffered_write(struct kiocb *iocb, struct iov_iter *from, |
60 | struct iomap_ops *ops); | |
61 | int iomap_zero_range(struct inode *inode, loff_t pos, loff_t len, | |
62 | bool *did_zero, struct iomap_ops *ops); | |
63 | int iomap_truncate_page(struct inode *inode, loff_t pos, bool *did_zero, | |
64 | struct iomap_ops *ops); | |
65 | int iomap_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf, | |
66 | struct iomap_ops *ops); | |
8be9f564 CH |
67 | int iomap_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
68 | loff_t start, loff_t len, struct iomap_ops *ops); | |
ae259a9c | 69 | |
199a31c6 | 70 | #endif /* LINUX_IOMAP_H */ |