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util: recognize SMB/CIFS filesystems as shared

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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)
This commit is contained in:
Laine Stump 2013-09-26 05:40:17 -04:00 committed by Cole Robinson
parent b2c87be92e
commit 9265a89ae8
2 changed files with 17 additions and 1 deletions
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16
src/util/virstoragefile.c
View File

@ -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)

2
src/util/virstoragefile.h
View File

@ -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);