[libvirt] [PATCHv4 7/8] storage: improve handling of symlinks in gluster

[Eric Blake]

With this patch, dangling and looping symlinks are silently
ignored, while links to files and directories are treated the
same as the underlying file or directory.  This is the same
behavior as both 'directory' and 'netfs' pools.

* src/storage/storage_backend_gluster.c
(virStorageBackendGlusterRefreshVol): Treat symlinks similar to
directory and netfs pools.

Signed-off-by: Eric Blake <eblake at redhat.com>
---
 src/storage/storage_backend_gluster.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/storage/storage_backend_gluster.c b/src/storage/storage_backend_gluster.c
index a4fd4b3..e935583 100644
--- a/src/storage/storage_backend_gluster.c
+++ b/src/storage/storage_backend_gluster.c
@@ -166,6 +166,17 @@ virStorageBackendGlusterRefreshVol(virStorageBackendGlusterStatePtr state,
     if (STREQ(name, ".") || STREQ(name, ".."))
         return 0;

+    /* Follow symlinks; silently skip broken links and loops.  */
+    if (S_ISLNK(st->st_mode) && glfs_stat(state->vol, name, st) < 0) {
+        if (errno == ENOENT || errno == ELOOP) {
+            VIR_WARN("ignoring dangling symlink '%s'", name);
+            ret = 0;
+        } else {
+            virReportSystemError(errno, _("cannot stat '%s'"), name);
+        }
+        return ret;
+    }
+
     if (VIR_ALLOC(vol) < 0)
         goto cleanup;

-- 
1.8.3.1