fs/xfs/xfs_buf.h

1 // SPDX-License-Identifier: GPL-2.0
3  * Copyright (c) 2000-2005 Silicon Graphics, Inc.
4  * All Rights Reserved.
25 #define XFS_BUF_DADDR_NULL	((xfs_daddr_t) (-1LL))
29 #define XBF_READ_AHEAD	 (1u << 2) /* asynchronous read-ahead */
30 #define XBF_NO_IOACCT	 (1u << 3) /* bypass I/O accounting (non-LRU bufs) */
32 #define XBF_DONE	 (1u << 5) /* all pages in the buffer uptodate */
87  * The xfs_buftarg contains 2 notions of "sector size" -
93  * The first is specified at mkfs time, and is stored on-disk in the
149 	 * first cacheline holds all the fields needed for an uncontended cache
153 	 * fast-path on locking.
196 	 * async write failure retry count. Initialised to zero on the first
201 	 * For retry timeouts, we record the jiffie of the first failure. This
202 	 * means that we can change the retry timeout for buffers already under
203 	 * I/O and thus avoid getting stuck in a retry loop with a long timeout.
205 	 * last_error is used to ensure that we are getting repeated errors, not
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
208 	 * retry behaviour appropriately when that happens.
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)