include/linux/iomap.h

1 /* SPDX-License-Identifier: GPL-2.0 */
31 #define IOMAP_INLINE	4	/* data inline in the inode */
37  * zeroing for areas that no data is copied to.
40  * written data and requires fdatasync to commit them to persistent storage.
51  * buffer heads for this mapping.
76 #define IOMAP_NULL_ADDR -1ULL	/* addr is not valid */
81 	u64			addr; /* disk offset of mapping, bytes */
82 	loff_t			offset;	/* file offset of mapping, bytes */
83 	u64			length;	/* length of mapping, bytes */
84 	u16			type;	/* type of mapping */
85 	u16			flags;	/* flags for mapping */
96 	return (iomap->addr + pos - iomap->offset) >> SECTOR_SHIFT;  in iomap_sector()
100  * When a filesystem sets page_ops in an iomap mapping it returns, page_prepare
122 #define IOMAP_FAULT		(1 << 3) /* mapping for page fault */
128 	 * Return the existing mapping at pos, or reserve space starting at
129 	 * pos for up to length, as long as we can do it as a single mapping.
130 	 * The actual length is returned in iomap->length.
140 	 * Written might be zero if no data was written.
150 		void *data, struct iomap *iomap, struct iomap *srcmap);
153 		unsigned flags, const struct iomap_ops *ops, void *data,
167 int iomap_migrate_page(struct address_space *mapping, struct page *newpage,
186 sector_t iomap_bmap(struct address_space *mapping, sector_t bno,
199 	void			*io_private;	/* file system private data */
242 int iomap_writepages(struct address_space *mapping,
247  * Flags for direct I/O ->end_io:
276 # define iomap_swapfile_activate(sis, swapfile, pagespan, ops)	(-EIO)