[Devel] [RH7 PATCH] ext4: drop pfcache csum on fallocate

[Dmitry Monakhov]

Dmitry Monakhov <dmonakhov at openvz.org> writes:

Please ignore this patch, use second version instead
> If fallocate will change file's data we have to drop csum.
>
> Signed-off-by: Dmitry Monakhov <dmonakhov at openvz.org>
> ---
>  fs/ext4/extents.c |    5 +++++
>  1 files changed, 5 insertions(+), 0 deletions(-)
>
> diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
> index 08b0709..fe95102 100644
> --- a/fs/ext4/extents.c
> +++ b/fs/ext4/extents.c
> @@ -5062,6 +5062,11 @@ long ext4_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
>  		     FALLOC_FL_CONVERT_AND_EXTEND))
>  		return -EOPNOTSUPP;
>  
> +	/* If data is about to change we must drop csum */
> +	if (ext4_test_inode_state(inode, EXT4_STATE_CSUM) &&
> +	    ((mode & ~FALLOC_FL_KEEP_SIZE)  || !(mode & FALLOC_FL_KEEP_SIZE)))
> +		ext4_truncate_data_csum(inode, -1);
> +
>  	if (mode & FALLOC_FL_PUNCH_HOLE)
>  		return ext4_punch_hole(inode, offset, len);
>  
> -- 
> 1.7.1
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