2 #define LINUX_IOMAP_H 1
4 #include <linux/types.h>
13 * Types of block ranges for iomap mappings:
15 #define IOMAP_HOLE 0x01 /* no blocks allocated, need allocation */
16 #define IOMAP_DELALLOC 0x02 /* delayed allocation blocks */
17 #define IOMAP_MAPPED 0x03 /* blocks allocated @blkno */
18 #define IOMAP_UNWRITTEN 0x04 /* blocks allocated @blkno in unwritten state */
21 * Magic value for blkno:
23 #define IOMAP_NULL_BLOCK -1LL /* blkno is not valid */
26 sector_t blkno; /* 1st sector of mapping, 512b units */
27 loff_t offset; /* file offset of mapping, bytes */
28 u64 length; /* length of mapping, bytes */
29 int type; /* type of mapping */
30 struct block_device *bdev; /* block device for I/O */
34 * Flags for iomap_begin / iomap_end. No flag implies a read.
36 #define IOMAP_WRITE (1 << 0)
37 #define IOMAP_ZERO (1 << 1)
41 * Return the existing mapping at pos, or reserve space starting at
42 * pos for up to length, as long as we can do it as a single mapping.
43 * The actual length is returned in iomap->length.
45 int (*iomap_begin)(struct inode *inode, loff_t pos, loff_t length,
46 unsigned flags, struct iomap *iomap);
49 * Commit and/or unreserve space previous allocated using iomap_begin.
50 * Written indicates the length of the successful write operation which
51 * needs to be commited, while the rest needs to be unreserved.
52 * Written might be zero if no data was written.
54 int (*iomap_end)(struct inode *inode, loff_t pos, loff_t length,
55 ssize_t written, unsigned flags, struct iomap *iomap);
58 ssize_t iomap_file_buffered_write(struct kiocb *iocb, struct iov_iter *from,
59 struct iomap_ops *ops);
60 int iomap_zero_range(struct inode *inode, loff_t pos, loff_t len,
61 bool *did_zero, struct iomap_ops *ops);
62 int iomap_truncate_page(struct inode *inode, loff_t pos, bool *did_zero,
63 struct iomap_ops *ops);
64 int iomap_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf,
65 struct iomap_ops *ops);
67 #endif /* LINUX_IOMAP_H */