[XFS] implement generic xfs_btree_get_rec

Not really much reason to make it generic given that it's so small, but
this is the last non-method in xfs_alloc_btree.c and xfs_ialloc_btree.c,
so it makes the whole btree implementation more structured.

SGI-PV: 985583

SGI-Modid: xfs-linux-melb:xfs-kern:32206a

Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
Signed-off-by: Bill O'Donnell <billodo@sgi.com>
Signed-off-by: David Chinner <david@fromorbit.com>

1 files changed, 23 insertions, 0 deletions

diff --git a/fs/xfs/xfs_ialloc.c b/fs/xfs/xfs_ialloc.c
index f13f59b13cc8..c8a56c529642 100644
--- a/fs/xfs/xfs_ialloc.c
+++ b/fs/xfs/xfs_ialloc.c
@@ -192,6 +192,29 @@ xfs_inobt_update(
 }
 
 /*
+ * Get the data from the pointed-to record.
+ */
+int                                     /* error */
+xfs_inobt_get_rec(
+        struct xfs_btree_cur    *cur,   /* btree cursor */
+        xfs_agino_t             *ino,   /* output: starting inode of chunk */
+        __int32_t               *fcnt,  /* output: number of free inodes */
+        xfs_inofree_t           *free,  /* output: free inode mask */
+        int                     *stat)  /* output: success/failure */
+{
+        union xfs_btree_rec     *rec;
+        int                     error;
+
+        error = xfs_btree_get_rec(cur, &rec, stat);
+        if (!error && *stat == 1) {
+                *ino = be32_to_cpu(rec->inobt.ir_startino);
+                *fcnt = be32_to_cpu(rec->inobt.ir_freecount);
+                *free = be64_to_cpu(rec->inobt.ir_free);
+        }
+        return error;
+}
+
+/*
  * Allocate new inodes in the allocation group specified by agbp.
  * Return 0 for success, else error code.
  */