| #ifndef LINUX_IOMAP_H |
| #define LINUX_IOMAP_H 1 |
| |
| #include <linux/types.h> |
| |
| struct fiemap_extent_info; |
| struct inode; |
| struct iov_iter; |
| struct kiocb; |
| struct vm_area_struct; |
| struct vm_fault; |
| |
| /* |
| * Types of block ranges for iomap mappings: |
| */ |
| #define IOMAP_HOLE 0x01 /* no blocks allocated, need allocation */ |
| #define IOMAP_DELALLOC 0x02 /* delayed allocation blocks */ |
| #define IOMAP_MAPPED 0x03 /* blocks allocated @blkno */ |
| #define IOMAP_UNWRITTEN 0x04 /* blocks allocated @blkno in unwritten state */ |
| |
| /* |
| * Flags for all iomap mappings: |
| */ |
| #define IOMAP_F_NEW 0x01 /* blocks have been newly allocated */ |
| |
| /* |
| * Flags that only need to be reported for IOMAP_REPORT requests: |
| */ |
| #define IOMAP_F_MERGED 0x10 /* contains multiple blocks/extents */ |
| #define IOMAP_F_SHARED 0x20 /* block shared with another file */ |
| |
| /* |
| * Magic value for blkno: |
| */ |
| #define IOMAP_NULL_BLOCK -1LL /* blkno is not valid */ |
| |
| struct iomap { |
| sector_t blkno; /* 1st sector of mapping, 512b units */ |
| loff_t offset; /* file offset of mapping, bytes */ |
| u64 length; /* length of mapping, bytes */ |
| u16 type; /* type of mapping */ |
| u16 flags; /* flags for mapping */ |
| struct block_device *bdev; /* block device for I/O */ |
| }; |
| |
| /* |
| * Flags for iomap_begin / iomap_end. No flag implies a read. |
| */ |
| #define IOMAP_WRITE (1 << 0) /* writing, must allocate blocks */ |
| #define IOMAP_ZERO (1 << 1) /* zeroing operation, may skip holes */ |
| #define IOMAP_REPORT (1 << 2) /* report extent status, e.g. FIEMAP */ |
| |
| struct iomap_ops { |
| /* |
| * Return the existing mapping at pos, or reserve space starting at |
| * pos for up to length, as long as we can do it as a single mapping. |
| * The actual length is returned in iomap->length. |
| */ |
| int (*iomap_begin)(struct inode *inode, loff_t pos, loff_t length, |
| unsigned flags, struct iomap *iomap); |
| |
| /* |
| * Commit and/or unreserve space previous allocated using iomap_begin. |
| * Written indicates the length of the successful write operation which |
| * needs to be commited, while the rest needs to be unreserved. |
| * Written might be zero if no data was written. |
| */ |
| int (*iomap_end)(struct inode *inode, loff_t pos, loff_t length, |
| ssize_t written, unsigned flags, struct iomap *iomap); |
| }; |
| |
| ssize_t iomap_file_buffered_write(struct kiocb *iocb, struct iov_iter *from, |
| struct iomap_ops *ops); |
| int iomap_file_dirty(struct inode *inode, loff_t pos, loff_t len, |
| struct iomap_ops *ops); |
| int iomap_zero_range(struct inode *inode, loff_t pos, loff_t len, |
| bool *did_zero, struct iomap_ops *ops); |
| int iomap_truncate_page(struct inode *inode, loff_t pos, bool *did_zero, |
| struct iomap_ops *ops); |
| int iomap_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf, |
| struct iomap_ops *ops); |
| int iomap_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
| loff_t start, loff_t len, struct iomap_ops *ops); |
| |
| #endif /* LINUX_IOMAP_H */ |