linux-kernel - Re: [f2fs-dev] [PATCH 5/6] f2fs: implement iomap operations

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Message-ID: <YakX38onzsW5Ef8B@google.com>
Date:   Thu, 2 Dec 2021 11:00:47 -0800
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     Eric Biggers <ebiggers@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [f2fs-dev] [PATCH 5/6] f2fs: implement iomap operations

On 12/02, Jaegeuk Kim wrote:
> On 12/02, Eric Biggers wrote:
> > On Thu, Dec 02, 2021 at 10:04:11PM +0800, Chao Yu wrote:
> > > On 2021/12/2 12:15, Eric Biggers wrote:
> > > > On Thu, Dec 02, 2021 at 11:10:41AM +0800, Chao Yu wrote:
> > > > > Why not relocating this check before f2fs_map_blocks()?
> > > 
> > > Wait, it supports DIO in multi-device image after commit 	71f2c8206202
> > > ("f2fs: multidevice: support direct IO"), how about
> > > checking with f2fs_allow_multi_device_dio()?
> > > 
> > > Thanks,
> > > 
> > 
> > Okay, that was not the case when I sent this patch originally.  We'll need to
> > update this to support multiple devices.
> 
> Chao/Eric, does this make sense?
> 
> --- a/fs/f2fs/data.c
> +++ b/fs/f2fs/data.c
> @@ -4070,11 +4070,10 @@ static int f2fs_iomap_begin(struct inode *inode, loff_t offset, loff_t length,
>                 }
>                 if (WARN_ON_ONCE(!__is_valid_data_blkaddr(map.m_pblk)))
>                         return -EINVAL;
> -               iomap->addr = blks_to_bytes(inode, map.m_pblk);
> 
> -               if (WARN_ON_ONCE(f2fs_is_multi_device(F2FS_I_SB(inode))))
> -                       return -EINVAL;
> -               iomap->bdev = inode->i_sb->s_bdev;
> +               iomap->bdev = map->m_multidev_dio ? map.m_bdev :

correction:			map.m_multidev_dio

> +                                               inode->i_sb->s_bdev;
> +               iomap->addr = blks_to_bytes(inode, map.m_pblk);
>         } else {
>                 iomap->length = blks_to_bytes(inode, next_pgofs) -
>                                 iomap->offset;
> 
> > 
> > - Eric
> 
> 
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