fs/xfs/xfs_buf_mem.h

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (c) 2023-2024 Oracle.  All Rights Reserved.
   4  * Author: Darrick J. Wong <djwong@kernel.org>
   5  */
   6 #ifndef __XFS_BUF_MEM_H__
   7 #define __XFS_BUF_MEM_H__
   8
   9 #define XMBUF_BLOCKSIZE                 (PAGE_SIZE)
  10 #define XMBUF_BLOCKSHIFT                (PAGE_SHIFT)
  11
  12 #ifdef CONFIG_XFS_MEMORY_BUFS
  13 static inline bool xfs_buftarg_is_mem(const struct xfs_buftarg *btp)
  14 {
  15         return btp->bt_bdev == NULL;
  16 }
  17
  18 int xmbuf_alloc(struct xfs_mount *mp, const char *descr,
  19                 struct xfs_buftarg **btpp);
  20 void xmbuf_free(struct xfs_buftarg *btp);
  21
  22 int xmbuf_map_page(struct xfs_buf *bp);
  23 void xmbuf_unmap_page(struct xfs_buf *bp);
  24 bool xmbuf_verify_daddr(struct xfs_buftarg *btp, xfs_daddr_t daddr);
  25 void xmbuf_trans_bdetach(struct xfs_trans *tp, struct xfs_buf *bp);
  26 int xmbuf_finalize(struct xfs_buf *bp);
  27 #else
  28 # define xfs_buftarg_is_mem(...)        (false)
  29 # define xmbuf_map_page(...)            (-ENOMEM)
  30 # define xmbuf_unmap_page(...)          ((void)0)
  31 # define xmbuf_verify_daddr(...)        (false)
  32 #endif /* CONFIG_XFS_MEMORY_BUFS */
  33
  34 #endif /* __XFS_BUF_MEM_H__ */