linux-kernel - Re: [PATCH] cifs: move superblock magic defitions to magic.h

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Date:   Mon, 10 Jan 2022 18:15:04 -0600
From:   Steve French <smfrench@...il.com>
To:     Jeff Layton <jlayton@...nel.org>
Cc:     CIFS <linux-cifs@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] cifs: move superblock magic defitions to magic.h

Patch looks fine to me.  Do you want me to add it to the cifs for-next
for this merge window, or do you want it merged through a different
tree?

On Mon, Jan 10, 2022 at 6:00 PM Jeff Layton <jlayton@...nel.org> wrote:
>
> Help userland apps to identify cifs and smb2 mounts.
>
> Signed-off-by: Jeff Layton <jlayton@...nel.org>
> ---
>  fs/cifs/cifsfs.c           | 3 ++-
>  fs/cifs/cifsglob.h         | 2 --
>  fs/cifs/smb1ops.c          | 3 ++-
>  fs/cifs/smb2glob.h         | 2 --
>  fs/cifs/smb2ops.c          | 5 +++--
>  include/uapi/linux/magic.h | 4 ++++
>  6 files changed, 11 insertions(+), 8 deletions(-)
>
> diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
> index dca42aa87d30..5a4d56622d2b 100644
> --- a/fs/cifs/cifsfs.c
> +++ b/fs/cifs/cifsfs.c
> @@ -26,6 +26,7 @@
>  #include <linux/random.h>
>  #include <linux/uuid.h>
>  #include <linux/xattr.h>
> +#include <uapi/linux/magic.h>
>  #include <net/ipv6.h>
>  #include "cifsfs.h"
>  #include "cifspdu.h"
> @@ -202,7 +203,7 @@ cifs_read_super(struct super_block *sb)
>                 sb->s_time_max = ts.tv_sec;
>         }
>
> -       sb->s_magic = CIFS_MAGIC_NUMBER;
> +       sb->s_magic = CIFS_SUPER_MAGIC;
>         sb->s_op = &cifs_super_ops;
>         sb->s_xattr = cifs_xattr_handlers;
>         rc = super_setup_bdi(sb);
> diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
> index be74606724c7..50e857e0a311 100644
> --- a/fs/cifs/cifsglob.h
> +++ b/fs/cifs/cifsglob.h
> @@ -24,8 +24,6 @@
>  #include "../smbfs_common/smb2pdu.h"
>  #include "smb2pdu.h"
>
> -#define CIFS_MAGIC_NUMBER 0xFF534D42      /* the first four bytes of SMB PDUs */
> -
>  #define SMB_PATH_MAX 260
>  #define CIFS_PORT 445
>  #define RFC1001_PORT 139
> diff --git a/fs/cifs/smb1ops.c b/fs/cifs/smb1ops.c
> index 3b83839fc2c2..dcc8b97e2bbf 100644
> --- a/fs/cifs/smb1ops.c
> +++ b/fs/cifs/smb1ops.c
> @@ -7,6 +7,7 @@
>
>  #include <linux/pagemap.h>
>  #include <linux/vfs.h>
> +#include <uapi/linux/magic.h>
>  #include "cifsglob.h"
>  #include "cifsproto.h"
>  #include "cifs_debug.h"
> @@ -878,7 +879,7 @@ cifs_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
>  {
>         int rc = -EOPNOTSUPP;
>
> -       buf->f_type = CIFS_MAGIC_NUMBER;
> +       buf->f_type = CIFS_SUPER_MAGIC;
>
>         /*
>          * We could add a second check for a QFS Unix capability bit
> diff --git a/fs/cifs/smb2glob.h b/fs/cifs/smb2glob.h
> index ca692b2283cd..4125fd113cfb 100644
> --- a/fs/cifs/smb2glob.h
> +++ b/fs/cifs/smb2glob.h
> @@ -13,8 +13,6 @@
>  #ifndef _SMB2_GLOB_H
>  #define _SMB2_GLOB_H
>
> -#define SMB2_MAGIC_NUMBER 0xFE534D42
> -
>  /*
>   *****************************************************************
>   * Constants go here
> diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
> index c5b1dea54ebc..57e856c195b5 100644
> --- a/fs/cifs/smb2ops.c
> +++ b/fs/cifs/smb2ops.c
> @@ -13,6 +13,7 @@
>  #include <linux/sort.h>
>  #include <crypto/aead.h>
>  #include <linux/fiemap.h>
> +#include <uapi/linux/magic.h>
>  #include "cifsfs.h"
>  #include "cifsglob.h"
>  #include "smb2pdu.h"
> @@ -2747,7 +2748,7 @@ smb2_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
>                 goto qfs_exit;
>
>         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
> -       buf->f_type = SMB2_MAGIC_NUMBER;
> +       buf->f_type = SMB2_SUPER_MAGIC;
>         info = (struct smb2_fs_full_size_info *)(
>                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
>         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
> @@ -2789,7 +2790,7 @@ smb311_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
>
>         rc = SMB311_posix_qfs_info(xid, tcon, fid.persistent_fid,
>                                    fid.volatile_fid, buf);
> -       buf->f_type = SMB2_MAGIC_NUMBER;
> +       buf->f_type = SMB2_SUPER_MAGIC;
>         SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
>         return rc;
>  }
> diff --git a/include/uapi/linux/magic.h b/include/uapi/linux/magic.h
> index a3034558b018..9438fd4a79c9 100644
> --- a/include/uapi/linux/magic.h
> +++ b/include/uapi/linux/magic.h
> @@ -53,6 +53,7 @@
>  #define QNX6_SUPER_MAGIC       0x68191122      /* qnx6 fs detection */
>  #define AFS_FS_MAGIC           0x6B414653
>
> +
>  #define REISERFS_SUPER_MAGIC   0x52654973      /* used by gcc */
>                                         /* used by file system utilities that
>                                            look at the superblock, etc.  */
> @@ -61,6 +62,9 @@
>  #define REISER2FS_JR_SUPER_MAGIC_STRING        "ReIsEr3Fs"
>
>  #define SMB_SUPER_MAGIC                0x517B
> +#define CIFS_SUPER_MAGIC       0xFF534D42      /* the first four bytes of SMB PDUs */
> +#define SMB2_SUPER_MAGIC       0xFE534D42
> +
>  #define CGROUP_SUPER_MAGIC     0x27e0eb
>  #define CGROUP2_SUPER_MAGIC    0x63677270
>
> --
> 2.34.1
>


-- 
Thanks,

Steve