linux-ext4 - Re: [PATCH 1/2] Make ext3 use bit operations to manipulate i

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Date:	Thu, 11 Oct 2007 14:08:32 -0600
From:	Andreas Dilger <adilger@...sterfs.com>
To:	Jan Kara <jack@...e.cz>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: [PATCH 1/2] Make ext3 use bit operations to manipulate i_flags

On Oct 11, 2007  20:01 +0200, Jan Kara wrote:
>  #define EXT3_TOPDIR_FL			17 /* Top of directory hierarchies*/
> +#define EXT3_RTIME_FL			18 /* Update recursive mtime */

Could you please use "20" (0x100000) for this flag, as there were patches to
use 18 (0x40000) for EXT4_HUGE_FILE_FL, and 19 (0x80000) is definitely
reserved for EXT4_EXTENTS_FL.

I'd suggest emailing Ted to reserve a flag for this, and also adding the
other reserved flags to ext2 and ext3 so there is no risk of conflicts.

> @@ -572,6 +576,7 @@ static inline int ext3_valid_inum(struct
>  #define EXT3_FEATURE_COMPAT_EXT_ATTR		0x0008
>  #define EXT3_FEATURE_COMPAT_RESIZE_INODE	0x0010
>  #define EXT3_FEATURE_COMPAT_DIR_INDEX		0x0020
> +#define EXT3_FEATURE_COMPAT_RTIME		0x0040

Similarly, there is already
#define EXT2_FEATURE_COMPAT_LAZY_BG             0x0040

in e2fsprogs so you need to use 0x0080 for your feature.  Please update
all of the ext*_fs.h files to have the most recent flags from e2fsprogs
so that we can avoid such dangers in the future.

Cheers, Andreas
--
Andreas Dilger
Principal Software Engineer
Cluster File Systems, Inc.

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