diff options
Diffstat (limited to 'fs/xfs/xfs_buf.h')
-rw-r--r-- | fs/xfs/xfs_buf.h | 43 |
1 files changed, 16 insertions, 27 deletions
diff --git a/fs/xfs/xfs_buf.h b/fs/xfs/xfs_buf.h index edced16..d24dbd4 100644 --- a/fs/xfs/xfs_buf.h +++ b/fs/xfs/xfs_buf.h @@ -1,19 +1,7 @@ +// SPDX-License-Identifier: GPL-2.0 /* * Copyright (c) 2000-2005 Silicon Graphics, Inc. * All Rights Reserved. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License as - * published by the Free Software Foundation. - * - * This program is distributed in the hope that it would be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write the Free Software Foundation, - * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef __XFS_BUF_H__ #define __XFS_BUF_H__ @@ -218,20 +206,9 @@ typedef struct xfs_buf { } xfs_buf_t; /* Finding and Reading Buffers */ -struct xfs_buf *_xfs_buf_find(struct xfs_buftarg *target, - struct xfs_buf_map *map, int nmaps, - xfs_buf_flags_t flags, struct xfs_buf *new_bp); - -static inline struct xfs_buf * -xfs_incore( - struct xfs_buftarg *target, - xfs_daddr_t blkno, - size_t numblks, - xfs_buf_flags_t flags) -{ - DEFINE_SINGLE_BUF_MAP(map, blkno, numblks); - return _xfs_buf_find(target, &map, 1, flags, NULL); -} +struct xfs_buf *xfs_buf_incore(struct xfs_buftarg *target, + xfs_daddr_t blkno, size_t numblks, + xfs_buf_flags_t flags); struct xfs_buf *_xfs_buf_alloc(struct xfs_buftarg *target, struct xfs_buf_map *map, int nmaps, @@ -358,6 +335,18 @@ extern void xfs_buf_terminate(void); void xfs_buf_set_ref(struct xfs_buf *bp, int lru_ref); +/* + * If the buffer is already on the LRU, do nothing. Otherwise set the buffer + * up with a reference count of 0 so it will be tossed from the cache when + * released. + */ +static inline void xfs_buf_oneshot(struct xfs_buf *bp) +{ + if (!list_empty(&bp->b_lru) || atomic_read(&bp->b_lru_ref) > 1) + return; + atomic_set(&bp->b_lru_ref, 0); +} + static inline int xfs_buf_ispinned(struct xfs_buf *bp) { return atomic_read(&bp->b_pin_count); |