Commit | Line | Data |
---|---|---|
b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
199a31c6 CH |
2 | #ifndef LINUX_IOMAP_H |
3 | #define LINUX_IOMAP_H 1 | |
4 | ||
5 | #include <linux/types.h> | |
6 | ||
8be9f564 | 7 | struct fiemap_extent_info; |
ae259a9c CH |
8 | struct inode; |
9 | struct iov_iter; | |
10 | struct kiocb; | |
11 | struct vm_area_struct; | |
12 | struct vm_fault; | |
13 | ||
14 | /* | |
15 | * Types of block ranges for iomap mappings: | |
16 | */ | |
199a31c6 CH |
17 | #define IOMAP_HOLE 0x01 /* no blocks allocated, need allocation */ |
18 | #define IOMAP_DELALLOC 0x02 /* delayed allocation blocks */ | |
19 | #define IOMAP_MAPPED 0x03 /* blocks allocated @blkno */ | |
20 | #define IOMAP_UNWRITTEN 0x04 /* blocks allocated @blkno in unwritten state */ | |
21 | ||
17de0a9f | 22 | /* |
d33fd776 | 23 | * Flags for all iomap mappings: |
17de0a9f | 24 | */ |
d33fd776 CH |
25 | #define IOMAP_F_NEW 0x01 /* blocks have been newly allocated */ |
26 | ||
27 | /* | |
28 | * Flags that only need to be reported for IOMAP_REPORT requests: | |
29 | */ | |
30 | #define IOMAP_F_MERGED 0x10 /* contains multiple blocks/extents */ | |
31 | #define IOMAP_F_SHARED 0x20 /* block shared with another file */ | |
17de0a9f | 32 | |
ae259a9c CH |
33 | /* |
34 | * Magic value for blkno: | |
35 | */ | |
199a31c6 CH |
36 | #define IOMAP_NULL_BLOCK -1LL /* blkno is not valid */ |
37 | ||
38 | struct iomap { | |
ae259a9c CH |
39 | sector_t blkno; /* 1st sector of mapping, 512b units */ |
40 | loff_t offset; /* file offset of mapping, bytes */ | |
41 | u64 length; /* length of mapping, bytes */ | |
17de0a9f CH |
42 | u16 type; /* type of mapping */ |
43 | u16 flags; /* flags for mapping */ | |
ae259a9c | 44 | struct block_device *bdev; /* block device for I/O */ |
fa5d932c | 45 | struct dax_device *dax_dev; /* dax_dev for dax operations */ |
ae259a9c CH |
46 | }; |
47 | ||
48 | /* | |
49 | * Flags for iomap_begin / iomap_end. No flag implies a read. | |
50 | */ | |
d33fd776 CH |
51 | #define IOMAP_WRITE (1 << 0) /* writing, must allocate blocks */ |
52 | #define IOMAP_ZERO (1 << 1) /* zeroing operation, may skip holes */ | |
53 | #define IOMAP_REPORT (1 << 2) /* report extent status, e.g. FIEMAP */ | |
9484ab1b | 54 | #define IOMAP_FAULT (1 << 3) /* mapping for page fault */ |
ff6a9292 | 55 | #define IOMAP_DIRECT (1 << 4) /* direct I/O */ |
a38d1243 | 56 | #define IOMAP_NOWAIT (1 << 5) /* Don't wait for writeback */ |
ae259a9c CH |
57 | |
58 | struct iomap_ops { | |
59 | /* | |
60 | * Return the existing mapping at pos, or reserve space starting at | |
61 | * pos for up to length, as long as we can do it as a single mapping. | |
62 | * The actual length is returned in iomap->length. | |
63 | */ | |
64 | int (*iomap_begin)(struct inode *inode, loff_t pos, loff_t length, | |
65 | unsigned flags, struct iomap *iomap); | |
66 | ||
67 | /* | |
68 | * Commit and/or unreserve space previous allocated using iomap_begin. | |
69 | * Written indicates the length of the successful write operation which | |
70 | * needs to be commited, while the rest needs to be unreserved. | |
71 | * Written might be zero if no data was written. | |
72 | */ | |
73 | int (*iomap_end)(struct inode *inode, loff_t pos, loff_t length, | |
74 | ssize_t written, unsigned flags, struct iomap *iomap); | |
199a31c6 CH |
75 | }; |
76 | ||
ae259a9c | 77 | ssize_t iomap_file_buffered_write(struct kiocb *iocb, struct iov_iter *from, |
8ff6daa1 | 78 | const struct iomap_ops *ops); |
5f4e5752 | 79 | int iomap_file_dirty(struct inode *inode, loff_t pos, loff_t len, |
8ff6daa1 | 80 | const struct iomap_ops *ops); |
ae259a9c | 81 | int iomap_zero_range(struct inode *inode, loff_t pos, loff_t len, |
8ff6daa1 | 82 | bool *did_zero, const struct iomap_ops *ops); |
ae259a9c | 83 | int iomap_truncate_page(struct inode *inode, loff_t pos, bool *did_zero, |
8ff6daa1 | 84 | const struct iomap_ops *ops); |
11bac800 | 85 | int iomap_page_mkwrite(struct vm_fault *vmf, const struct iomap_ops *ops); |
8be9f564 | 86 | int iomap_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
8ff6daa1 | 87 | loff_t start, loff_t len, const struct iomap_ops *ops); |
0ed3b0d4 AG |
88 | loff_t iomap_seek_hole(struct inode *inode, loff_t offset, |
89 | const struct iomap_ops *ops); | |
90 | loff_t iomap_seek_data(struct inode *inode, loff_t offset, | |
91 | const struct iomap_ops *ops); | |
ae259a9c | 92 | |
ff6a9292 CH |
93 | /* |
94 | * Flags for direct I/O ->end_io: | |
95 | */ | |
96 | #define IOMAP_DIO_UNWRITTEN (1 << 0) /* covers unwritten extent(s) */ | |
97 | #define IOMAP_DIO_COW (1 << 1) /* covers COW extent(s) */ | |
98 | typedef int (iomap_dio_end_io_t)(struct kiocb *iocb, ssize_t ret, | |
99 | unsigned flags); | |
100 | ssize_t iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter, | |
8ff6daa1 | 101 | const struct iomap_ops *ops, iomap_dio_end_io_t end_io); |
ff6a9292 | 102 | |
199a31c6 | 103 | #endif /* LINUX_IOMAP_H */ |