On 12.12.18 г. 20:05 ч., fdmanana@xxxxxxxxxx wrote:
> From: Filipe Manana <fdmanana@xxxxxxxx>
>
> Comparing the content of the pages in the range to deduplicate is now done
> by the generic helper generic_remap_file_range_prep(), which takes care of
very minor nit: the checks are performed in generic_remap_checks which
is called by generic_remap_file_range_prep. But even without this change
LGTM.
> ensuring we do not compare/deduplicate undefined data beyond a file's eof
> (range from eof to the next block boundary). So remove these checks which
> are now redundant.
>
> Signed-off-by: Filipe Manana <fdmanana@xxxxxxxx>
> ---
> fs/btrfs/ioctl.c | 19 ++-----------------
> 1 file changed, 2 insertions(+), 17 deletions(-)
>
> diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
> index 4e9efc93340e..3a27efa2b955 100644
> --- a/fs/btrfs/ioctl.c
> +++ b/fs/btrfs/ioctl.c
> @@ -3206,31 +3206,16 @@ static void btrfs_double_inode_lock(struct inode *inode1, struct inode *inode2)
> inode_lock_nested(inode2, I_MUTEX_CHILD);
> }
>
> -static int btrfs_extent_same_range(struct inode *src, u64 loff, u64 olen,
> +static int btrfs_extent_same_range(struct inode *src, u64 loff, u64 len,
> struct inode *dst, u64 dst_loff)
> {
> - u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize;
> int ret;
> - u64 len = olen;
> -
> - if (loff + len == src->i_size)
> - len = ALIGN(src->i_size, bs) - loff;
> - /*
> - * For same inode case we don't want our length pushed out past i_size
> - * as comparing that data range makes no sense.
> - *
> - * This effectively means we require aligned extents for the single
> - * inode case, whereas the other cases allow an unaligned length so long
> - * as it ends at i_size.
> - */
> - if (dst == src && len != olen)
> - return -EINVAL;
>
> /*
> * Lock destination range to serialize with concurrent readpages().
> */
> lock_extent(&BTRFS_I(dst)->io_tree, dst_loff, dst_loff + len - 1);
> - ret = btrfs_clone(src, dst, loff, olen, len, dst_loff, 1);
> + ret = btrfs_clone(src, dst, loff, len, len, dst_loff, 1);
> unlock_extent(&BTRFS_I(dst)->io_tree, dst_loff, dst_loff + len - 1);
>
> return ret;
>
