util: recognize SMB/CIFS filesystems as shared

This should resolve:

  https://bugzilla.redhat.com/show_bug.cgi?id=1012085

libvirt previously recognized NFS, GFS2, OCFS2, and AFS filesystems as
"shared", and thus eligible for exceptions to certain rules/actions
about chowning image files before handing them off to a guest. This
patch widens the definition of "shared filesystem" to include SMB and
CIFS filesystems (aka "Windows file sharing"); both of these use the
same protocol, but different drivers so there are different magic
numbers for each.

(cherry picked from commit e4e73337e5a5aa708bb356751404ab8ae6583f42)

diff --git a/src/util/virstoragefile.c b/src/util/virstoragefile.c
index 532234e1340769c4ad01ec7c6e73ca060b2858f8..60fdcf3ab20515bede269e545ff1cb6c9170feae 100644 (file)
--- a/src/util/virstoragefile.c
+++ b/src/util/virstoragefile.c
@@ -1085,6 +1085,12 @@ cleanup:
 # ifndef AFS_FS_MAGIC
 #  define AFS_FS_MAGIC 0x6B414653
 # endif
+# ifndef SMB_SUPER_MAGIC
+#  define SMB_SUPER_MAGIC 0x517B
+# endif
+# ifndef CIFS_SUPER_MAGIC
+#  define CIFS_SUPER_MAGIC 0xFF534D42
+# endif
 
 
 int virStorageFileIsSharedFSType(const char *path,
@@ -1150,6 +1156,12 @@ int virStorageFileIsSharedFSType(const char *path,
     if ((fstypes & VIR_STORAGE_FILE_SHFS_AFS) &&
         (sb.f_type == AFS_FS_MAGIC))
         return 1;
+    if ((fstypes & VIR_STORAGE_FILE_SHFS_SMB) &&
+        (sb.f_type == SMB_SUPER_MAGIC))
+        return 1;
+    if ((fstypes & VIR_STORAGE_FILE_SHFS_CIFS) &&
+        (sb.f_type == CIFS_SUPER_MAGIC))
+        return 1;
 
     return 0;
 }
@@ -1168,7 +1180,9 @@ int virStorageFileIsSharedFS(const char *path)
                                         VIR_STORAGE_FILE_SHFS_NFS |
                                         VIR_STORAGE_FILE_SHFS_GFS2 |
                                         VIR_STORAGE_FILE_SHFS_OCFS |
-                                        VIR_STORAGE_FILE_SHFS_AFS);
+                                        VIR_STORAGE_FILE_SHFS_AFS |
+                                        VIR_STORAGE_FILE_SHFS_SMB |
+                                        VIR_STORAGE_FILE_SHFS_CIFS);
 }
 
 int virStorageFileIsClusterFS(const char *path)

diff --git a/src/util/virstoragefile.h b/src/util/virstoragefile.h
index ffe7a54039edc803006525c3ab4bb52308210b56..a93e664fd808687412176f94d07d59adbbff82e3 100644 (file)
--- a/src/util/virstoragefile.h
+++ b/src/util/virstoragefile.h
@@ -96,6 +96,8 @@ enum {
     VIR_STORAGE_FILE_SHFS_GFS2 = (1 << 1),
     VIR_STORAGE_FILE_SHFS_OCFS = (1 << 2),
     VIR_STORAGE_FILE_SHFS_AFS = (1 << 3),
+    VIR_STORAGE_FILE_SHFS_SMB = (1 << 4),
+    VIR_STORAGE_FILE_SHFS_CIFS = (1 << 5),
 };
 
 int virStorageFileIsSharedFS(const char *path);