linux-ext4 - Re: [PATCH] ext2: fix FS

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Date:   Wed, 28 Feb 2018 17:28:00 +0100
From:   Jan Kara <jack@...e.cz>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Jan Kara <jack@...e.com>, Dan Williams <dan.j.williams@...el.com>,
        Ernesto A. Fernández 
        <ernesto.mnd.fernandez@...il.com>,
        Andreas Dilger <adilger@...ger.ca>,
        Andreas Gruenbacher <agruenba@...hat.com>,
        Tejun Heo <tj@...nel.org>, linux-ext4@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ext2: fix FS_IOMAP dependency

On Wed 28-02-18 14:36:46, Arnd Bergmann wrote:
> I ran into a randconfig link error on next-20180228 that appears to have
> been caused by an older patch:
> 
> fs/ext2/inode.o: In function `ext2_setattr':
> inode.c:(.text+0x19eb): undefined reference to `iomap_zero_range'
> 
> This adds a compile-time conditional around the code path so the
> compiler can optimize out the reference in configurations that don't
> need it anyway.
> 
> Fixes: 00697eed386d ("ext2: use iomap_zero_range() for zeroing truncated page in DAX path")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Thanks for the patch but Dan's patches [1] deal with a breakage like this
in a more complete way so I'd prefer to go with his full series...

								Honza

[1] https://lkml.org/lkml/2018/2/26/1323

> ---
>  fs/ext2/inode.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c
> index 5d5e9f7b98d6..6e6db0ab3bd6 100644
> --- a/fs/ext2/inode.c
> +++ b/fs/ext2/inode.c
> @@ -1296,7 +1296,7 @@ static int ext2_setsize(struct inode *inode, loff_t newsize)
>  
>  	inode_dio_wait(inode);
>  
> -	if (IS_DAX(inode)) {
> +	if (IS_ENABLED(CONFIG_FS_DAX) && IS_DAX(inode)) {
>  		error = iomap_zero_range(inode, newsize,
>  					 PAGE_ALIGN(newsize) - newsize, NULL,
>  					 &ext2_iomap_ops);
> -- 
> 2.9.0
> 
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR