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From: Filipe Manana <fdmanana@kernel.org>
To: linux-btrfs <linux-btrfs@vger.kernel.org>
Cc: David Sterba <dsterba@suse.com>
Subject: Re: [PATCH 4/4] Btrfs: remove no longer needed range length checks for deduplication
Date: Tue, 12 Feb 2019 17:58:48 +0000
Message-ID: <CAL3q7H7S_C2PWdYF2b7nLQQMvJjdnNRuJVC4mWW2mun56s-4sQ@mail.gmail.com> (raw)
In-Reply-To: <CAL3q7H55XWqvr2DA_BbqZtva_01iqVD19fkRZFLe14cVTyEY8Q@mail.gmail.com>

On Thu, Jan 31, 2019 at 4:31 PM Filipe Manana <fdmanana@kernel.org> wrote:
>
> On Wed, Dec 12, 2018 at 6:07 PM <fdmanana@kernel.org> wrote:
> >
> > From: Filipe Manana <fdmanana@suse.com>
> >
> > 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
> > 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@suse.com>
>
> Any reason why this was not yet picked?
> Thanks.

Another ping. Thanks.

>
> > ---
> >  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;
> > --
> > 2.11.0
> >

  reply index

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-12-12 18:05 [PATCH 0/4] Btrfs: a few more cleanups and fixes for clone/deduplication fdmanana
2018-12-12 18:05 ` [PATCH 1/4] Btrfs: move duplicated nodatasum check into common reflink/dedupe helper fdmanana
2019-01-11 14:55   ` David Sterba
2018-12-12 18:05 ` [PATCH 2/4] Btrfs: use cross mount point check for cloning and deduplication fdmanana
2018-12-13 16:02   ` David Sterba
2019-01-11 14:38     ` David Sterba
2018-12-12 18:05 ` [PATCH 3/4] Btrfs: check if destination root is read-only for deduplication fdmanana
2018-12-13 16:07   ` David Sterba
2019-01-31 16:39     ` Filipe Manana
2019-01-31 16:44       ` Hugo Mills
2019-02-18 15:38         ` David Sterba
2019-02-18 16:55           ` Filipe Manana
2019-02-12 17:59       ` Filipe Manana
2019-02-20 16:41       ` Zygo Blaxell
2019-02-20 16:54         ` Filipe Manana
2019-02-20 17:17           ` Zygo Blaxell
2019-02-22 11:13             ` Filipe Manana
2019-02-22 17:25               ` David Sterba
2019-02-21 16:54           ` Zygo Blaxell
2019-02-18 16:01   ` David Sterba
2018-12-12 18:05 ` [PATCH 4/4] Btrfs: remove no longer needed range length checks " fdmanana
2018-12-13 12:20   ` Nikolay Borisov
2019-01-31 16:31   ` Filipe Manana
2019-02-12 17:58     ` Filipe Manana [this message]
2019-02-18 15:10     ` David Sterba
2018-12-13 12:19 ` [PATCH 0/4] Btrfs: a few more cleanups and fixes for clone/deduplication Nikolay Borisov

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