GFS2: Speed up starting point selection for block allocation

When setting the starting point for block allocation, there were calls
to both gfs2_rbm_to_block() and gfs2_rbm_from_block() in the common case
of there being an active reservation. The gfs2_rbm_from_block() function
can be quite slow, and since the two conversions were effectively a
no-op, it makes sense to avoid them entirely in this case.

There is no functional change here, but the code should be a bit more
efficient after this patch.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

1 files changed, 31 insertions, 10 deletions

diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index 4f0984a607b3..4d83abdd5635 100644
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -2134,6 +2134,35 @@ out:
 }
 
 /**
+ * gfs2_set_alloc_start - Set starting point for block allocation
+ * @rbm: The rbm which will be set to the required location
+ * @ip: The gfs2 inode
+ * @dinode: Flag to say if allocation includes a new inode
+ *
+ * This sets the starting point from the reservation if one is active
+ * otherwise it falls back to guessing a start point based on the
+ * inode's goal block or the last allocation point in the rgrp.
+ */
+
+static void gfs2_set_alloc_start(struct gfs2_rbm *rbm,
+                                 const struct gfs2_inode *ip, bool dinode)
+{
+        u64 goal;
+
+        if (gfs2_rs_active(ip->i_res)) {
+                *rbm = ip->i_res->rs_rbm;
+                return;
+        }
+
+        if (!dinode && rgrp_contains_block(rbm->rgd, ip->i_goal))
+                goal = ip->i_goal;
+        else
+                goal = rbm->rgd->rd_last_alloc + rbm->rgd->rd_data0;
+
+        gfs2_rbm_from_block(rbm, goal);
+}
+
+/**
  * gfs2_alloc_blocks - Allocate one or more blocks of data and/or a dinode
  * @ip: the inode to allocate the block for
  * @bn: Used to return the starting block number
@@ -2151,22 +2180,14 @@ int gfs2_alloc_blocks(struct gfs2_inode *ip, u64 *bn, unsigned int *nblocks,
         struct buffer_head *dibh;
         struct gfs2_rbm rbm = { .rgd = ip->i_rgd, };
         unsigned int ndata;
-        u64 goal;
         u64 block; /* block, within the file system scope */
         int error;
 
-        if (gfs2_rs_active(ip->i_res))
-                goal = gfs2_rbm_to_block(&ip->i_res->rs_rbm);
-        else if (!dinode && rgrp_contains_block(rbm.rgd, ip->i_goal))
-                goal = ip->i_goal;
-        else
-                goal = rbm.rgd->rd_last_alloc + rbm.rgd->rd_data0;
-
-        gfs2_rbm_from_block(&rbm, goal);
+        gfs2_set_alloc_start(&rbm, ip, dinode);
         error = gfs2_rbm_find(&rbm, GFS2_BLKST_FREE, 0, ip, false);
 
         if (error == -ENOSPC) {
-                gfs2_rbm_from_block(&rbm, goal);
+                gfs2_set_alloc_start(&rbm, ip, dinode);
                 error = gfs2_rbm_find(&rbm, GFS2_BLKST_FREE, 0, NULL, false);
         }