On Tue, Jun 23, 2015 at 02:28:36PM -0700, Mark Fasheh wrote: > In the case that we dedupe the tail of a file, we might expand the dedupe > len out to the end of our last block. We don't want to compare data past > i_size however, so pass the original length to btrfs_cmp_data(). Reviewed-by: Liu Bo <bo.li.liu@xxxxxxxxxx> > > Signed-off-by: Mark Fasheh <mfasheh@xxxxxxx> > Reviewed-by: David Sterba <dsterba@xxxxxxx> > --- > fs/btrfs/ioctl.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c > index 2d24ff4..2deea1f 100644 > --- a/fs/btrfs/ioctl.c > +++ b/fs/btrfs/ioctl.c > @@ -2933,7 +2933,8 @@ static int btrfs_extent_same(struct inode *src, u64 loff, u64 olen, > goto out_unlock; > } > > - ret = btrfs_cmp_data(src, loff, dst, dst_loff, len); > + /* pass original length for comparison so we stay within i_size */ > + ret = btrfs_cmp_data(src, loff, dst, dst_loff, olen); > if (ret == 0) > ret = btrfs_clone(src, dst, loff, olen, len, dst_loff); > > -- > 2.1.2 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
