fs/xfs/xfs_buf.h

1 // SPDX-License-Identifier: GPL-2.0
3  * Copyright (c) 2000-2005 Silicon Graphics, Inc.
25 #define XFS_BUF_DADDR_NULL	((xfs_daddr_t) (-1LL))
27 #define XBF_READ	 (1u << 0) /* buffer intended for reading from device */
28 #define XBF_WRITE	 (1u << 1) /* buffer intended for writing to device */
29 #define XBF_READ_AHEAD	 (1u << 2) /* asynchronous read-ahead */
83  * The xfs_buftarg contains 2 notions of "sector size" -
87  * 2) The device logical sector size
89  * The first is specified at mkfs time, and is stored on-disk in the
92  * The latter is derived from the underlying device, and controls direct IO
119 	/* built-in cache, if we're not using the perag one */
155 	 * fast-path on locking.
177 	struct xfs_buftarg	*b_target;	/* buffer target (device) */
184 	struct xfs_buf_map	*b_maps;	/* compound buffer map */
185 	struct xfs_buf_map	__b_map;	/* inline compound buffer map */
202 	 * different errors. e.g. a block device might change ENOSPC to EIO when
203 	 * a failure timeout occurs, so we want to re-initialise the error
291 	((bp)->b_sema.count <= 0)
313 	return bp->b_addr + offset;  in xfs_buf_offset()
318 	memset(bp->b_addr + boff, 0, bsize);  in xfs_buf_zero()
333 	return bp->b_maps[0].bm_bn;  in xfs_buf_daddr()
345 	if (!list_empty(&bp->b_lru) || atomic_read(&bp->b_lru_ref) > 1)  in xfs_buf_oneshot()
347 	atomic_set(&bp->b_lru_ref, 0);  in xfs_buf_oneshot()
352 	return atomic_read(&bp->b_pin_count);  in xfs_buf_ispinned()
358 	return xfs_verify_cksum(bp->b_addr, BBTOB(bp->b_length),  in xfs_buf_verify_cksum()
365 	xfs_update_cksum(bp->b_addr, BBTOB(bp->b_length),  in xfs_buf_update_cksum()
379 #define xfs_getsize_buftarg(buftarg)	block_size((buftarg)->bt_bdev)
380 #define xfs_readonly_buftarg(buftarg)	bdev_read_only((buftarg)->bt_bdev)