[libvirt] [PATCH] [v3] storage: Ignore dangling symbolic link for filesystem pool

[Osier Yang]

If there is a dangling symbolic link in filesystem pool, the pool
will fail to start or refresh, this patch is to fix it by ignoring
it with a warning log.
---
 src/storage/storage_backend.c    |   10 +++++++++-
 src/storage/storage_backend_fs.c |    2 +-
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/src/storage/storage_backend.c b/src/storage/storage_backend.c
index 10ea33c..f4a17a2 100644
--- a/src/storage/storage_backend.c
+++ b/src/storage/storage_backend.c
@@ -977,7 +977,8 @@ virStorageBackendForType(int type) {
 /*
  * Allows caller to silently ignore files with improper mode
  *
- * Returns -1 on error, -2 if file mode is unexpected.
+ * Returns -1 on error, -2 if file mode is unexpected or the
+ * volume is a dangling symbolic link.
  */
 int
 virStorageBackendVolOpenCheckMode(const char *path, unsigned int flags)
@@ -986,6 +987,13 @@ virStorageBackendVolOpenCheckMode(const char *path, unsigned int flags)
     struct stat sb;

     if ((fd = open(path, O_RDONLY|O_NONBLOCK|O_NOCTTY)) < 0) {
+        if (stat(path, &sb) < 0 &&
+            (errno == ENOENT || errno == ELOOP)) {
+            VIR_WARN(_("cannot open volume '%s' :%s"), path,
+                     strerror(errno));
+            return -2;
+        }
+
         virReportSystemError(errno,
                              _("cannot open volume '%s'"),
                              path);
diff --git a/src/storage/storage_backend_fs.c b/src/storage/storage_backend_fs.c
index d916d2d..ff39d48 100644
--- a/src/storage/storage_backend_fs.c
+++ b/src/storage/storage_backend_fs.c
@@ -651,7 +651,7 @@ virStorageBackendFileSystemRefresh(virConnectPtr conn ATTRIBUTE_UNUSED,
                 goto cleanup;
             else {
                 /* Silently ignore non-regular files,
-                 * eg '.' '..', 'lost+found' */
+                 * eg '.' '..', 'lost+found', dangling symbolic link */
                 virStorageVolDefFree(vol);
                 vol = NULL;
                 continue;
--
1.7.3.2