2 #define LINUX_IOMAP_H 1
4 #include <linux/types.h>
6 struct fiemap_extent_info
;
10 struct vm_area_struct
;
14 * Types of block ranges for iomap mappings:
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 */
22 * Magic value for blkno:
24 #define IOMAP_NULL_BLOCK -1LL /* blkno is not valid */
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 */
35 * Flags for iomap_begin / iomap_end. No flag implies a read.
37 #define IOMAP_WRITE (1 << 0)
38 #define IOMAP_ZERO (1 << 1)
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.
46 int (*iomap_begin
)(struct inode
*inode
, loff_t pos
, loff_t length
,
47 unsigned flags
, struct iomap
*iomap
);
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.
55 int (*iomap_end
)(struct inode
*inode
, loff_t pos
, loff_t length
,
56 ssize_t written
, unsigned flags
, struct iomap
*iomap
);
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
);
67 int iomap_fiemap(struct inode
*inode
, struct fiemap_extent_info
*fieinfo
,
68 loff_t start
, loff_t len
, struct iomap_ops
*ops
);
70 #endif /* LINUX_IOMAP_H */
This page took 0.03579 seconds and 6 git commands to generate.