gfapi: remove unnecessary call to glfs_resolve_base()

Calling glfs_resolve_base() on the root inode for every resolver
invocation is unnecessary and wasteful.

Here are the results from running a test program which performs
path based operations (creates and deletes 1000 files):

Without patch:
[root@blackbox ~]# sync
[root@blackbox ~]# time ./a.out 1

real    0m4.314s
user    0m1.923s
sys     0m1.144s
[root@blackbox ~]# sync
[root@blackbox ~]# time ./a.out 1

real    0m4.383s
user    0m1.940s
sys     0m1.177s
[root@blackbox ~]# sync
[root@blackbox ~]# time ./a.out 1

real    0m4.339s
user    0m1.863s
sys     0m1.129s

With patch:

[root@blackbox ~]# sync
[root@blackbox ~]# time ./a.out 1

real    0m3.005s
user    0m1.162s
sys     0m0.816s
[root@blackbox ~]# sync
[root@blackbox ~]# time ./a.out 1

real    0m3.188s
user    0m1.222s
sys     0m0.867s
[root@blackbox ~]# sync
[root@blackbox ~]# time ./a.out 1

real    0m2.999s
user    0m1.131s
sys     0m0.832s

Change-Id: Id160a24f44b4dccfcfce99a6f69ddb8938523cd5
BUG: 953694
Signed-off-by: Anand Avati <avati@redhat.com>
Reviewed-on: http://review.gluster.org/6131
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Raghavendra Talur <rtalur@redhat.com>
Reviewed-by: Raghavendra Bhat <raghavendra@redhat.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/api/src/glfs-resolve.c b/api/src/glfs-resolve.c
index 20fda3eff64..4ca2eb6fcf4 100644
--- a/api/src/glfs-resolve.c
+++ b/api/src/glfs-resolve.c
@@ -341,7 +341,8 @@ glfs_resolve_at (struct glfs *fs, xlator_t *subvol, inode_t *at,
 	} else {
 		inode = inode_ref (subvol->itable->root);
 
-		glfs_resolve_base (fs, subvol, inode, &ciatt);
+		if (strcmp (path, "/") == 0)
+			glfs_resolve_base (fs, subvol, inode, &ciatt);
 	}
 
 	for (component = strtok_r (path, "/", &saveptr);