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8be9f564d2
Add a simple fiemap implementation based on iomap_ops, partially based on a previous implementation from Bob Peterson <rpeterso@redhat.com>. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
71 lines
2.2 KiB
C
71 lines
2.2 KiB
C
#ifndef LINUX_IOMAP_H
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#define LINUX_IOMAP_H 1
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#include <linux/types.h>
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struct fiemap_extent_info;
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struct inode;
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struct iov_iter;
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struct kiocb;
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struct vm_area_struct;
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struct vm_fault;
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/*
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* Types of block ranges for iomap mappings:
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*/
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#define IOMAP_HOLE 0x01 /* no blocks allocated, need allocation */
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#define IOMAP_DELALLOC 0x02 /* delayed allocation blocks */
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#define IOMAP_MAPPED 0x03 /* blocks allocated @blkno */
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#define IOMAP_UNWRITTEN 0x04 /* blocks allocated @blkno in unwritten state */
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/*
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* Magic value for blkno:
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*/
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#define IOMAP_NULL_BLOCK -1LL /* blkno is not valid */
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struct iomap {
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sector_t blkno; /* 1st sector of mapping, 512b units */
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loff_t offset; /* file offset of mapping, bytes */
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u64 length; /* length of mapping, bytes */
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int type; /* type of mapping */
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struct block_device *bdev; /* block device for I/O */
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};
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/*
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* Flags for iomap_begin / iomap_end. No flag implies a read.
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*/
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#define IOMAP_WRITE (1 << 0)
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#define IOMAP_ZERO (1 << 1)
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struct iomap_ops {
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/*
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* Return the existing mapping at pos, or reserve space starting at
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* pos for up to length, as long as we can do it as a single mapping.
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* The actual length is returned in iomap->length.
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*/
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int (*iomap_begin)(struct inode *inode, loff_t pos, loff_t length,
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unsigned flags, struct iomap *iomap);
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/*
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* Commit and/or unreserve space previous allocated using iomap_begin.
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* Written indicates the length of the successful write operation which
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* needs to be commited, while the rest needs to be unreserved.
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* Written might be zero if no data was written.
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*/
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int (*iomap_end)(struct inode *inode, loff_t pos, loff_t length,
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ssize_t written, unsigned flags, struct iomap *iomap);
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};
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ssize_t iomap_file_buffered_write(struct kiocb *iocb, struct iov_iter *from,
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struct iomap_ops *ops);
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int iomap_zero_range(struct inode *inode, loff_t pos, loff_t len,
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bool *did_zero, struct iomap_ops *ops);
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int iomap_truncate_page(struct inode *inode, loff_t pos, bool *did_zero,
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struct iomap_ops *ops);
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int iomap_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf,
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struct iomap_ops *ops);
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int iomap_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
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loff_t start, loff_t len, struct iomap_ops *ops);
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#endif /* LINUX_IOMAP_H */
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