security: Document @restore member of transaction list

Both DAC and SELinux drivers support transactions. Each item on
the transaction list consists of various variables and @restore
is one of them. Document it so that as the list of variables grow
it's easier to spot which variable does what.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>
Reviewed-by: NCole Robinson <crobinso@redhat.com>
Reviewed-by: NDaniel P. Berrangé <berrange@redhat.com>

src/security/security_dac.c

@@ -79,7 +79,7 @@ struct _virSecurityDACChownItem {
     const virStorageSource *src;
     uid_t uid;
     gid_t gid;
-    bool restore;
+    bool restore; /* Whether current operation is 'set' or 'restore' */
 };
 
 typedef struct _virSecurityDACChownList virSecurityDACChownList;
@@ -155,8 +155,11 @@ virSecurityDACChownListFree(void *opaque)
  * @src: disk source to chown
  * @uid: user ID
  * @gid: group ID
+ * @restore: if current operation is set or restore
  *
  * Appends an entry onto transaction list.
+ * The @restore should be true if the operation is restoring
+ * seclabel and false otherwise.
  *
  * Returns: 1 in case of successful append
  *          0 if there is no transaction enabled

src/security/security_selinux.c

@@ -82,7 +82,7 @@ struct _virSecuritySELinuxContextItem {
     char *path;
     char *tcon;
     bool optional;
-    bool restore;
+    bool restore; /* Whether current operation is 'set' or 'restore' */
 };
 
 typedef struct _virSecuritySELinuxContextList virSecuritySELinuxContextList;
@@ -168,8 +168,11 @@ virSecuritySELinuxContextListFree(void *opaque)
  * @path: Path to chown
  * @tcon: target context
  * @optional: true if setting @tcon is optional
+ * @restore: if current operation is set or restore
  *
  * Appends an entry onto transaction list.
+ * The @restore should be true if the operation is restoring
+ * seclabel and false otherwise.
  *
  * Returns: 1 in case of successful append
  *          0 if there is no transaction enabled