linux-kernel - Re: [PATCH] change inotifyfs magic as the same magic is used for futexfs

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Message-Id: <20070921085313.39717ba4.randy.dunlap@oracle.com>
Date:	Fri, 21 Sep 2007 08:53:13 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Andrey Mirkin <amirkin@...ru>
Cc:	John McCutchan <ttb@...tacle.dhs.org>,
	Robert Love <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>, Andrew Morton <akpm@...l.org>,
	devel@...nvz.org
Subject: Re: [PATCH] change inotifyfs magic as the same magic is used for
 futexfs

On Fri, 21 Sep 2007 17:35:43 +0400 Andrey Mirkin wrote:

> From: Andrey Mirkin <major@...nvz.org>
> 
> Right now futexfs and inotifyfs have one magic 0xBAD1DEA, that looks a little 
> bit confusing.
> Use 0xBAD1DEA as magic for futexfs and 0x2BAD1DEA as magic for inotifyfs.
> 
> Signed-off-by: Andrey Mirkin <major@...nvz.org>

A 'diffstat -p 1 -w 70' would be helpful so we can see which files
are touched.

Please add these magic numbers to include/linux/magic.h so that
they are clearly visible and conflicts can be seen easier,
then #include <linux/magic.h> in these source files.


> ----
> 
> diff --git a/fs/inotify_user.c b/fs/inotify_user.c
> index 9bf2f6c..9b1a195 100644
> --- a/fs/inotify_user.c
> +++ b/fs/inotify_user.c
> @@ -684,7 +684,7 @@ static int
>  inotify_get_sb(struct file_system_type *fs_type, int flags,
>  	       const char *dev_name, void *data, struct vfsmount *mnt)
>  {
> -	return get_sb_pseudo(fs_type, "inotify", NULL, 0xBAD1DEA, mnt);
> +	return get_sb_pseudo(fs_type, "inotify", NULL, INOTIFYFS_MAGIC, mnt);
>  }
>  
>  static struct file_system_type inotify_fs_type = {
> diff --git a/include/linux/futex.h b/include/linux/futex.h
> index 9965035..89611cc 100644
> --- a/include/linux/futex.h
> +++ b/include/linux/futex.h
> @@ -3,6 +3,8 @@ #define _LINUX_FUTEX_H
>  
>  #include <linux/sched.h>
>  
> +#define FUTEXFS_MAGIC 0xBAD1DEA
> +
>  union ktime;
>  
>  /* Second argument to futex syscall */
> diff --git a/include/linux/inotify.h b/include/linux/inotify.h
> index d4f48c6..2579c4d 100644
> --- a/include/linux/inotify.h
> +++ b/include/linux/inotify.h
> @@ -9,6 +9,8 @@ #define _LINUX_INOTIFY_H
>  
>  #include <linux/types.h>
>  
> +#define INOTIFYFS_MAGIC 0x2BAD1DEA
> +
>  /*
>   * struct inotify_event - structure read from the inotify device for each 
> event
>   *
> diff --git a/kernel/futex.c b/kernel/futex.c
> index e8935b1..6b57355 100644
> --- a/kernel/futex.c
> +++ b/kernel/futex.c
> @@ -2074,7 +2074,7 @@ static int futexfs_get_sb(struct file_sy
>  			  int flags, const char *dev_name, void *data,
>  			  struct vfsmount *mnt)
>  {
> -	return get_sb_pseudo(fs_type, "futex", NULL, 0xBAD1DEA, mnt);
> +	return get_sb_pseudo(fs_type, "futex", NULL, FUTEXFS_MAGIC, mnt);
>  }
>  
>  static struct file_system_type futex_fs_type = {
> -

---
~Randy
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