[libvirt] [PATCHv2] 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. --- Change from V1 - also check for CIFS_SUPER_MAGIC, not just SMB_SUPER_MAGIC. src/util/virstoragefile.c | 16 +++++++++++++++- src/util/virstoragefile.h | 2 ++ 2 files changed, 17 insertions(+), 1 deletion(-) diff --git a/src/util/virstoragefile.c b/src/util/virstoragefile.c index 0b9cec3..48d5fbb 100644 --- a/src/util/virstoragefile.c +++ b/src/util/virstoragefile.c @@ -1241,6 +1241,12 @@ 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, @@ -1304,6 +1310,12 @@ 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; } @@ -1322,7 +1334,9 @@ 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 1f89839..d5effa4 100644 --- a/src/util/virstoragefile.h +++ b/src/util/virstoragefile.h @@ -112,6 +112,8 @@ 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); -- 1.7.11.7