Re: [PATCH 1/4] ext4: Fix data exposure after a crash

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Sun 24-04-16 00:55:51, Ted Tso wrote:
> I had to add a !IS_NOQUOTA check:
> 
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index 576f64a..250c2df 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -693,6 +693,7 @@ out_sem:
>  		if (map->m_flags & EXT4_MAP_NEW &&
>  		    !(map->m_flags & EXT4_MAP_UNWRITTEN) &&
>  		    !(flags & EXT4_GET_BLOCKS_ZERO) &&
> +		    !IS_NOQUOTA(inode) &&
>  		    ext4_should_order_data(inode)) {
>  			ret = ext4_jbd2_file_inode(handle, inode);
>  			if (ret)
> 
> 
> In order to prevent crashes when writing to the quota file (see
> below).

Good catch. The fix looks correct to me, thanks for fixing this up. Since
data for quota files is actually journalled, it may be actually a cleaner
fix to reflect this in ext4_inode_journal_mode() and thus
ext4_should_order_data() would catch this case. But this has more potential
for breakage elsewhere so I will do that as a separate cleanup patch.

								Honza
-- 
Jan Kara <jack@xxxxxxxx>
SUSE Labs, CR
--
To unsubscribe from this list: send the line "unsubscribe stable" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html



[Index of Archives]     [Linux Kernel]     [Kernel Development Newbies]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite Hiking]     [Linux Kernel]     [Linux SCSI]