features/locks: Find parent-entrylk presence in lookup

Change-Id: I8fc85676827f26b07bf578ea1152d3e251adb4af
BUG: 765551
Signed-off-by: Pranith Kumar K <pranithk@gluster.com>
Reviewed-on: http://review.gluster.com/3177
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Anand Avati <avati@redhat.com>

4 files changed, 59 insertions, 4 deletions

diff --git a/xlators/features/locks/src/common.h b/xlators/features/locks/src/common.h
index fe5ebada9a8..2cf9aa38093 100644
--- a/xlators/features/locks/src/common.h
+++ b/xlators/features/locks/src/common.h
@@ -149,4 +149,6 @@ pl_verify_reservelk (xlator_t *this, pl_inode_t *pl_inode,
                      posix_lock_t *lock, int can_block);
 int
 pl_reserve_unlock (xlator_t *this, pl_inode_t *pl_inode, posix_lock_t *reqlock);
+uint32_t
+check_entrylk_on_basename (xlator_t *this, inode_t *parent, char *basename);
 #endif /* __COMMON_H__ */
diff --git a/xlators/features/locks/src/entrylk.c b/xlators/features/locks/src/entrylk.c
index e034c37b325..2a47657dbbb 100644
--- a/xlators/features/locks/src/entrylk.c
+++ b/xlators/features/locks/src/entrylk.c
@@ -441,6 +441,32 @@ out:
         return ret_lock;
 }
 
+uint32_t
+check_entrylk_on_basename (xlator_t *this, inode_t *parent, char *basename)
+{
+        uint32_t        entrylk = 0;
+        pl_inode_t      *pinode = 0;
+        pl_dom_list_t   *dom = NULL;
+        pl_entry_lock_t *conf       = NULL;
+
+        pinode = pl_inode_get (this, parent);
+        if (!pinode)
+                goto out;
+        pthread_mutex_lock (&pinode->mutex);
+        {
+                list_for_each_entry (dom, &pinode->dom_list, inode_list) {
+                        conf = __lock_grantable (dom, basename, ENTRYLK_WRLCK);
+                        if (conf && conf->basename) {
+                                entrylk = 1;
+                                break;
+                        }
+                }
+        }
+        pthread_mutex_unlock (&pinode->mutex);
+
+out:
+        return entrylk;
+}
 
 void
 __grant_blocked_entry_locks (xlator_t *this, pl_inode_t *pl_inode,
diff --git a/xlators/features/locks/src/locks.h b/xlators/features/locks/src/locks.h
index f855c07899c..f64c2690241 100644
--- a/xlators/features/locks/src/locks.h
+++ b/xlators/features/locks/src/locks.h
@@ -165,6 +165,7 @@ typedef struct {
         gf_boolean_t   entrylk_count_req;
         gf_boolean_t   inodelk_count_req;
         gf_boolean_t   posixlk_count_req;
+        gf_boolean_t   parent_entrylk_req;
 
         /* used by {f,}truncate */
         loc_t  loc;
diff --git a/xlators/features/locks/src/posix.c b/xlators/features/locks/src/posix.c
index 3e04c18f008..0bf022a943e 100644
--- a/xlators/features/locks/src/posix.c
+++ b/xlators/features/locks/src/posix.c
@@ -1508,6 +1508,24 @@ out:
 }
 
 void
+pl_parent_entrylk_xattr_fill (xlator_t *this, inode_t *parent,
+                              char *basename, dict_t *dict)
+{
+        uint32_t         entrylk = 0;
+        int             ret     = -1;
+
+        if (!parent || !basename || !strlen (basename))
+                goto out;
+        entrylk = check_entrylk_on_basename (this, parent, basename);
+out:
+        ret = dict_set_uint32 (dict, GLUSTERFS_PARENT_ENTRYLK, entrylk);
+        if (ret < 0) {
+                gf_log (this->name, GF_LOG_DEBUG,
+                        " dict_set failed on key %s", GLUSTERFS_PARENT_ENTRYLK);
+        }
+}
+
+void
 pl_entrylk_xattr_fill (xlator_t *this, inode_t *inode,
                        dict_t *dict)
 {
@@ -1570,12 +1588,14 @@ pl_lookup_cbk (call_frame_t *frame,
 
         GF_VALIDATE_OR_GOTO (this->name, frame->local, out);
 
-        if (op_ret) {
+        if (op_ret)
                 goto out;
-        }
 
         local = frame->local;
 
+        if (local->parent_entrylk_req)
+                pl_parent_entrylk_xattr_fill (this, local->loc.parent,
+                                              (char*)local->loc.name, xdata);
         if (local->entrylk_count_req)
                 pl_entrylk_xattr_fill (this, inode, xdata);
         if (local->inodelk_count_req)
@@ -1584,12 +1604,15 @@ pl_lookup_cbk (call_frame_t *frame,
                 pl_posixlk_xattr_fill (this, inode, xdata);
 
 
+out:
+        local = frame->local;
         frame->local = NULL;
 
-        if (local != NULL)
+        if (local != NULL) {
+                loc_wipe (&local->loc);
                 mem_put (local);
+        }
 
-out:
         STACK_UNWIND_STRICT (
                      lookup,
                      frame,
@@ -1625,9 +1648,12 @@ pl_lookup (call_frame_t *frame,
                         local->inodelk_count_req = 1;
                 if (dict_get (xdata, GLUSTERFS_POSIXLK_COUNT))
                         local->posixlk_count_req = 1;
+                if (dict_get (xdata, GLUSTERFS_PARENT_ENTRYLK))
+                        local->parent_entrylk_req = 1;
         }
 
         frame->local = local;
+        loc_copy (&local->loc, loc);
 
         STACK_WIND (frame,
                     pl_lookup_cbk,