linux-ext4 - Re: [RFC] [PATCH 1/1] Nanosecond timestamps

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Date:	Wed, 7 Feb 2007 21:50:28 +0100
From:	Johann Lombardi <johann.lombardi@...l.net>
To:	Kalpak Shah <kalpak@...sterfs.com>
Cc:	linux-ext4 <linux-ext4@...r.kernel.org>,
	Andreas Dilger <adilger@...sterfs.com>, tytso <tytso@....edu>,
	sct <sct@...hat.com>
Subject: Re: [RFC] [PATCH 1/1] Nanosecond timestamps

On Fri, Feb 02, 2007 at 08:19:50PM +0530, Kalpak Shah wrote:
> +#define EXT3_INODE_SET_XTIME(xtime, extra_xtime, inode, raw_inode) \
> +do { \
> +       (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
> + \
> +       if (offsetof(typeof(*raw_inode), extra_xtime) - \
> +           offsetof(typeof(*raw_inode), i_extra_isize) + \
> +           sizeof((raw_inode)->extra_xtime) <= \
> +               le16_to_cpu((raw_inode)->i_extra_isize)) \
                               ^^^^^^^^^^^^^^^^^^^^^^^^^
> +               (raw_inode)->extra_xtime = \

With 128-byte inodes, raw_inode->i_extra_isize is beyond the inode limit
and the above will corrupt the filesystem.
IMO, i_extra_isize from ext3_inode_info should be used instead of
raw_inode->i_extra_isize.

> +#define EXT3_INODE_GET_XTIME(xtime, extra_xtime, inode, raw_inode) \
> +do { \
> +       (inode)->xtime.tv_sec = le32_to_cpu((raw_inode)->xtime); \
> + \
> +       if (offsetof(typeof(*raw_inode), extra_xtime) - \
> +           offsetof(typeof(*raw_inode), i_extra_isize) + \
> +           sizeof((raw_inode)->extra_xtime) <= \
> +           le16_to_cpu((raw_inode)->i_extra_isize)) { \
                           ^^^^^^^^^^^^^^^^^^^^^^^^^
ditto

Cheers,
Johann
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