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 */
30 #define XBF_NO_IOACCT	 (1u << 3) /* bypass I/O accounting (non-LRU bufs) */
87  * The xfs_buftarg contains 2 notions of "sector size" -
91  * 2) The device logical sector size
93  * The first is specified at mkfs time, and is stored on-disk in the
96  * The latter is derived from the underlying device, and controls direct IO
153 	 * fast-path on locking.
176 	struct xfs_buftarg	*b_target;	/* buffer target (device) */
185 	struct xfs_buf_map	*b_maps;	/* compound buffer map */
186 	struct xfs_buf_map	__b_map;	/* inline compound buffer map */
206 	 * different errors. e.g. a block device might change ENOSPC to EIO when
207 	 * a failure timeout occurs, so we want to re-initialise the error
295 	((bp)->b_sema.count <= 0)
329 	return bp->b_maps[0].bm_bn;  in xfs_buf_daddr()
341 	if (!list_empty(&bp->b_lru) || atomic_read(&bp->b_lru_ref) > 1)  in xfs_buf_oneshot()
343 	atomic_set(&bp->b_lru_ref, 0);  in xfs_buf_oneshot()
348 	return atomic_read(&bp->b_pin_count);  in xfs_buf_ispinned()
354 	return xfs_verify_cksum(bp->b_addr, BBTOB(bp->b_length),  in xfs_buf_verify_cksum()
361 	xfs_update_cksum(bp->b_addr, BBTOB(bp->b_length),  in xfs_buf_update_cksum()
375 #define xfs_getsize_buftarg(buftarg)	block_size((buftarg)->bt_bdev)
376 #define xfs_readonly_buftarg(buftarg)	bdev_read_only((buftarg)->bt_bdev)