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-rw-r--r--libglusterfs/src/inode.c110
-rw-r--r--libglusterfs/src/inode.h17
2 files changed, 127 insertions, 0 deletions
diff --git a/libglusterfs/src/inode.c b/libglusterfs/src/inode.c
index 3a6464ac5e1..6f3bc535a14 100644
--- a/libglusterfs/src/inode.c
+++ b/libglusterfs/src/inode.c
@@ -2569,3 +2569,113 @@ inode_ctx_size (inode_t *inode)
out:
return size;
}
+
+static void
+inode_parent_null_check(inode_t **parent, inode_t *inode, char **component)
+{
+ GF_VALIDATE_OR_GOTO ("inode", inode, out);
+ GF_VALIDATE_OR_GOTO ("inode", (*component), out);
+
+ if (!(*parent) && __is_root_gfid (inode->gfid)) {
+ *parent = inode_ref (inode);
+ *component = "/";
+ }
+out:
+ return;
+}
+
+/*
+ * This function changes component name and parent inode
+ * if the component name is either "." or ".."
+ *
+ * @Paramas:
+ * Parent : Parent inode of current dentry
+ * component : component name that we need to test
+ * dentry_name : Address for memory if need to change component.
+ * The caller has to preallocate this memory with
+ * PATH_MAX as the size.
+ *
+ * We return the updated parent inode and component in the
+ * respective structures.
+ *
+ * Basic Idea of the function:
+ *
+ * Example 1 :
+ * Path /out_dir/dir/in_dir/.
+ * In put values :
+ * parent = in_dir
+ * component : "."
+ *
+ * Out put values:
+ * parent : dir
+ * component : "in_dir"
+ *
+ * Example 2 :
+ * Path /out_dir/dir/in_dir/..
+ * In put values :
+ * parent = in_dir
+ * component : ".."
+ *
+ * Out put values:
+ * parent : output_dir
+ * component : "dir"
+ */
+void
+glusterfs_normalize_dentry (inode_t **parent, char **component,
+ char *dentry_name)
+{
+ inode_t *temp_inode = NULL;
+ dentry_t *dentry = NULL;
+
+ GF_VALIDATE_OR_GOTO ("inode", (*parent), out);
+ GF_VALIDATE_OR_GOTO ("inode", (*component), out);
+ GF_VALIDATE_OR_GOTO ("inode", (dentry_name), out);
+
+ /* After this point, there should not be "." or ".."
+ * in the path. Dot and double dots are replaced with
+ * appropriate base name and parent inode.
+ */
+
+ /* During the resolving, if it goes beyond the mount point
+ * we do lookup on the mount itself like "/.. " will be
+ * converted as "/"
+ */
+ if (strcmp (*component, ".") == 0) {
+ temp_inode = *parent;
+ *parent = inode_parent (*parent, 0, 0);
+ inode_parent_null_check (parent, temp_inode, component);
+ pthread_mutex_lock (&temp_inode->table->lock);
+ {
+ dentry = __dentry_search_arbit (temp_inode);
+ if (dentry) {
+ snprintf (dentry_name, PATH_MAX, "%s",
+ dentry->name);
+ *component = dentry_name;
+ }
+ }
+ pthread_mutex_unlock (&temp_inode->table->lock);
+ inode_unref (temp_inode);
+ } else if (strcmp (*component, "..") == 0) {
+ temp_inode = *parent;
+ *parent = inode_parent (*parent, 0, 0);
+ inode_parent_null_check (parent, temp_inode, component);
+ inode_unref (temp_inode);
+
+ temp_inode = *parent;
+ *parent = inode_parent (*parent, 0, 0);
+ inode_parent_null_check (parent, temp_inode, component);
+ pthread_mutex_lock (&temp_inode->table->lock);
+ {
+ dentry = __dentry_search_arbit (temp_inode);
+ if (dentry) {
+ snprintf (dentry_name, PATH_MAX, "%s",
+ dentry->name);
+ *component = dentry_name;
+ }
+ }
+ pthread_mutex_unlock (&temp_inode->table->lock);
+ inode_unref (temp_inode);
+ }
+out:
+ return;
+}
diff --git a/libglusterfs/src/inode.h b/libglusterfs/src/inode.h
index cdc2095a0e8..253196378a8 100644
--- a/libglusterfs/src/inode.h
+++ b/libglusterfs/src/inode.h
@@ -286,4 +286,21 @@ inode_has_dentry (inode_t *inode);
size_t
inode_ctx_size (inode_t *inode);
+/*
+ * This function is used to change the dentry from a path
+ * if it contains any "." or ".." .
+ *
+ * It replaces "." and ".." to proper bname after resolving
+ * and will change the component accordingly.
+ *
+ * This fucntion also replaces the parent inode based on the
+ * bname.
+ *
+ * We should give a allocated memory as a third argument to store
+ * the component in case if we are modifying it.
+ */
+
+void
+glusterfs_normalize_dentry (inode_t **parent, char **component,
+ char *dentry_name);
#endif /* _INODE_H */