linux-kernel - Re: [PATCH v3 13/13] bcachefs: fiemap: emit new COMPRESSED state

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Date: Fri, 5 Apr 2024 13:17:45 -0600
From: Andreas Dilger <adilger@...ger.ca>
To: Sweet Tea Dorminy <sweettea-kernel@...miny.me>,
 Kent Overstreet <kent.overstreet@...ux.dev>
Cc: Jonathan Corbet <corbet@....net>,
 Kent Overstreet <kent.overstreet@...ux.dev>,
 Brian Foster <bfoster@...hat.com>,
 Chris Mason <clm@...com>,
 Josef Bacik <josef@...icpanda.com>,
 David Sterba <dsterba@...e.com>,
 Jaegeuk Kim <jaegeuk@...nel.org>,
 Chao Yu <chao@...nel.org>,
 Alexander Viro <viro@...iv.linux.org.uk>,
 Christian Brauner <brauner@...nel.org>,
 Jan Kara <jack@...e.cz>,
 Mickaël Salaün <mic@...ikod.net>,
 linux-doc@...r.kernel.org,
 Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
 linux-bcachefs@...r.kernel.org,
 linux-btrfs <linux-btrfs@...r.kernel.org>,
 linux-f2fs-devel@...ts.sourceforge.net,
 linux-fsdevel <linux-fsdevel@...r.kernel.org>,
 kernel-team@...a.com
Subject: Re: [PATCH v3 13/13] bcachefs: fiemap: emit new COMPRESSED state

On Apr 3, 2024, at 1:22 AM, Sweet Tea Dorminy <sweettea-kernel@...miny.me> wrote:
> 
> Signed-off-by: Sweet Tea Dorminy <sweettea-kernel@...miny.me>
> ---
> fs/bcachefs/fs.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/bcachefs/fs.c b/fs/bcachefs/fs.c
> index d2793bae842d..54f613f977b4 100644
> --- a/fs/bcachefs/fs.c
> +++ b/fs/bcachefs/fs.c
> @@ -921,7 +921,7 @@ static int bch2_fill_extent(struct bch_fs *c,
> 				flags2 |= FIEMAP_EXTENT_UNWRITTEN;
> 
> 			if (p.crc.compression_type) {
> -				flags2 |= FIEMAP_EXTENT_ENCODED;
> +				flags2 |= FIEMAP_EXTENT_DATA_COMPRESSED;

(defect) This should *also* set FIEMAP_EXTENT_ENCODED in this case,
along with FIEMAP_EXTENT_DATA_COMPRESSED.  Both for compatibility with
older code that doesn't understand FIEMAP_EXTENT_DATA_COMPRESSED, and
because the data still cannot be read directly from the volume when it
is not mounted.

Probably Kent should chime in here with what needs to be done to set
the phys_len properly for bcachefs, or leave this patch out of your
series and let him submit it directly.  With proposed wrapper in the
first patch of the series there isn't a hard requirement to change
all of the filesystems in one shot.

Cheers, Andreas






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