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authorDave Chinner <dchinner@redhat.com>2018-04-18 08:25:20 -0700
committerDarrick J. Wong <darrick.wong@oracle.com>2018-05-09 10:04:00 -0700
commit8925a3dc4771004b3e697e7159fa87be2aa5dd43 (patch)
treed28e888c15966f861b3b9093a29fb62061549c49 /fs/xfs/xfs_buf.c
parente443523d191041df942750efddc971efb803f827 (diff)
xfs: make xfs_buf_incore out of line
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>
Diffstat (limited to 'fs/xfs/xfs_buf.c')
-rw-r--r--fs/xfs/xfs_buf.c21
1 files changed, 16 insertions, 5 deletions
diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c
index 55661cbdb51b..349d42fde1d7 100644
--- a/fs/xfs/xfs_buf.c
+++ b/fs/xfs/xfs_buf.c
@@ -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