[PATCH 14/15] smb: client: support security.xfstests on POSIX mounts

Add security.xfstests to the exact native xattr table. The existing
security handler can then send and receive it without a user prefix on
POSIX mounts, reject the colliding user.security.xfstests spelling, and
preserve the native name in listxattr output.

The mapping can be checked from a POSIX-mounted client:

  $ CIFS_MNT=/path/to/cifs-mount
  $ file="$CIFS_MNT/security-xfstests"
  $ touch "$file"
  $ setfattr -n security.xfstests -v attr "$file"

Signed-off-by: Ze Tan <[email protected]>
---
 fs/smb/client/xattr.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/smb/client/xattr.c b/fs/smb/client/xattr.c
index f975bccf98a5..59f6655a1b34 100644
--- a/fs/smb/client/xattr.c
+++ b/fs/smb/client/xattr.c
@@ -43,6 +43,7 @@ enum { XATTR_USER, XATTR_SECURITY,
 
 static const char * const cifs_native_xattr_names[] = {
 	XATTR_NAME_CAPS,
+	XATTR_SECURITY_PREFIX "xfstests",
 };
 
 enum cifs_ea_name_type
-- 
2.43.0