performance/stat-prefetch: implement sp_readlink.

Signed-off-by: Anand V. Avati <avati@dev.gluster.com>

BUG: 221 (stat prefetch implementation)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=221

1 files changed, 34 insertions, 0 deletions

diff --git a/xlators/performance/stat-prefetch/src/stat-prefetch.c b/xlators/performance/stat-prefetch/src/stat-prefetch.c
index cdf6d73dece..dd3f4942de4 100644
--- a/xlators/performance/stat-prefetch/src/stat-prefetch.c
+++ b/xlators/performance/stat-prefetch/src/stat-prefetch.c
@@ -1144,6 +1144,39 @@ unwind:
 
 
 int32_t
+sp_readlink_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
+                 int32_t op_ret, int32_t op_errno, const char *path)
+{
+	SP_STACK_UNWIND (frame, op_ret, op_errno, path);
+        return 0;
+}
+
+
+int32_t
+sp_readlink (call_frame_t *frame, xlator_t *this, loc_t *loc, size_t size)
+{
+        sp_cache_t *cache = NULL;
+
+        GF_VALIDATE_OR_GOTO (this->name, loc, unwind);
+        GF_VALIDATE_OR_GOTO (this->name, loc->parent, unwind);
+        GF_VALIDATE_OR_GOTO (this->name, loc->name, unwind);
+
+        cache = sp_get_cache_inode (this, loc->parent, frame->root->pid);
+        if (cache) {
+                sp_cache_remove_entry (cache, (char *)loc->name, 0);
+        }
+
+	STACK_WIND (frame, sp_readlink_cbk, FIRST_CHILD(this),
+                    FIRST_CHILD(this)->fops->readlink, loc, size);
+        return 0;
+
+unwind:
+        SP_STACK_UNWIND (frame, -1, errno, NULL);
+        return 0;
+}
+
+
+int32_t
 sp_forget (xlator_t *this, inode_t *inode)
 {
         struct stat *buf   = NULL;
@@ -1201,6 +1234,7 @@ struct xlator_fops fops = {
         .truncate  = sp_truncate,
         .ftruncate = sp_ftruncate,
         .utimens   = sp_utimens,
+        .readlink  = sp_readlink,
 };
 
 struct xlator_mops mops = {