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xfs: make xfs_buf_incore out of line

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Move xfs_buf_incore out of line and make it the only way to look up
a buffer in the buffer cache from outside the buffer cache. Convert
the external users of _xfs_buf_find() to xfs_buf_incore() and make
_xfs_buf_find() static.

Signed-Off-By: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
[darrick: actually rename xfs_incore -> xfs_buf_incore]
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Dave Chinner
2018-04-18 08:25:20 -07:00
committed by Darrick J. Wong
parent e443523d19
commit 8925a3dc47
4 changed files with 22 additions and 23 deletions
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21
fs/xfs/xfs_buf.c
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@@ -549,17 +549,17 @@ xfs_buf_hash_destroy(
}
/*
* Look up, and creates if absent, a lockable buffer for
* a given range of an inode. The buffer is returned
* locked. No I/O is implied by this call.
* Look up (and insert if absent), a lockable buffer for a given
* range of an inode. The buffer is returned locked. No I/O is
* implied by this call.
*/
xfs_buf_t *
static struct xfs_buf *
_xfs_buf_find(
struct xfs_buftarg *btp,
struct xfs_buf_map *map,
int nmaps,
xfs_buf_flags_t flags,
xfs_buf_t *new_bp)
struct xfs_buf *new_bp)
{
struct xfs_perag *pag;
xfs_buf_t *bp;
@@ -649,6 +649,17 @@ found:
return bp;
}
struct xfs_buf *
xfs_buf_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);
}
/*
* Assembles a buffer covering the specified range. The code is optimised for
* cache hits, as metadata intensive workloads will see 3 orders of magnitude