linux-kernel - Re: [PATCH v4 07/12] ext4, dax: replace IS_DAX() with IS

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Date:   Tue, 27 Feb 2018 18:02:53 +0100
From:   Jan Kara <jack@...e.cz>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     linux-nvdimm@...ts.01.org, Theodore Ts'o <tytso@....edu>,
        Matthew Wilcox <mawilcox@...rosoft.com>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        linux-mm@...ck.org, Andreas Dilger <adilger.kernel@...ger.ca>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Jan Kara <jack@...e.com>, linux-fsdevel@...r.kernel.org,
        Ross Zwisler <ross.zwisler@...ux.intel.com>
Subject: Re: [PATCH v4 07/12] ext4, dax: replace IS_DAX() with IS_FSDAX()

On Mon 26-02-18 20:20:32, Dan Williams wrote:
> In preparation for fixing the broken definition of S_DAX in the
> CONFIG_FS_DAX=n + CONFIG_DEV_DAX=y case, convert all IS_DAX() usages to
> use explicit tests for FSDAX since DAX is ambiguous.
> 
> Cc: Jan Kara <jack@...e.com>
> Cc: "Theodore Ts'o" <tytso@....edu>
> Cc: Andreas Dilger <adilger.kernel@...ger.ca>
> Cc: Alexander Viro <viro@...iv.linux.org.uk>
> Cc: Matthew Wilcox <mawilcox@...rosoft.com>
> Cc: Ross Zwisler <ross.zwisler@...ux.intel.com>
> Cc: <stable@...r.kernel.org>
> Fixes: dee410792419 ("/dev/dax, core: file operations and dax-mmap")
> Signed-off-by: Dan Williams <dan.j.williams@...el.com>

Looks good. You can add:

Reviewed-by: Jan Kara <jack@...e.cz>

								Honza


> ---
>  fs/ext4/file.c  |   12 +++++-------
>  fs/ext4/inode.c |    4 ++--
>  fs/ext4/ioctl.c |    2 +-
>  fs/ext4/super.c |    2 +-
>  4 files changed, 9 insertions(+), 11 deletions(-)
> 
> diff --git a/fs/ext4/file.c b/fs/ext4/file.c
> index 51854e7608f0..561ea843b458 100644
> --- a/fs/ext4/file.c
> +++ b/fs/ext4/file.c
> @@ -48,7 +48,7 @@ static ssize_t ext4_dax_read_iter(struct kiocb *iocb, struct iov_iter *to)
>  	 * Recheck under inode lock - at this point we are sure it cannot
>  	 * change anymore
>  	 */
> -	if (!IS_DAX(inode)) {
> +	if (!IS_FSDAX(inode)) {
>  		inode_unlock_shared(inode);
>  		/* Fallback to buffered IO in case we cannot support DAX */
>  		return generic_file_read_iter(iocb, to);
> @@ -68,7 +68,7 @@ static ssize_t ext4_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
>  	if (!iov_iter_count(to))
>  		return 0; /* skip atime */
>  
> -	if (IS_DAX(file_inode(iocb->ki_filp)))
> +	if (IS_FSDAX(file_inode(iocb->ki_filp)))
>  		return ext4_dax_read_iter(iocb, to);
>  	return generic_file_read_iter(iocb, to);
>  }
> @@ -216,10 +216,8 @@ ext4_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
>  	if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))
>  		return -EIO;
>  
> -#ifdef CONFIG_FS_DAX
> -	if (IS_DAX(inode))
> +	if (IS_FSDAX(inode))
>  		return ext4_dax_write_iter(iocb, from);
> -#endif
>  	if (!o_direct && (iocb->ki_flags & IOCB_NOWAIT))
>  		return -EOPNOTSUPP;
>  
> @@ -361,11 +359,11 @@ static int ext4_file_mmap(struct file *file, struct vm_area_struct *vma)
>  	 * We don't support synchronous mappings for non-DAX files. At least
>  	 * until someone comes with a sensible use case.
>  	 */
> -	if (!IS_DAX(file_inode(file)) && (vma->vm_flags & VM_SYNC))
> +	if (!IS_FSDAX(file_inode(file)) && (vma->vm_flags & VM_SYNC))
>  		return -EOPNOTSUPP;
>  
>  	file_accessed(file);
> -	if (IS_DAX(file_inode(file))) {
> +	if (IS_FSDAX(file_inode(file))) {
>  		vma->vm_ops = &ext4_dax_vm_ops;
>  		vma->vm_flags |= VM_MIXEDMAP | VM_HUGEPAGE;
>  	} else {
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index c94780075b04..1879b33aa391 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -3858,7 +3858,7 @@ static ssize_t ext4_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
>  		return 0;
>  
>  	/* DAX uses iomap path now */
> -	if (WARN_ON_ONCE(IS_DAX(inode)))
> +	if (WARN_ON_ONCE(IS_FSDAX(inode)))
>  		return 0;
>  
>  	trace_ext4_direct_IO_enter(inode, offset, count, iov_iter_rw(iter));
> @@ -4076,7 +4076,7 @@ static int ext4_block_zero_page_range(handle_t *handle,
>  	if (length > max || length < 0)
>  		length = max;
>  
> -	if (IS_DAX(inode)) {
> +	if (IS_FSDAX(inode)) {
>  		return iomap_zero_range(inode, from, length, NULL,
>  					&ext4_iomap_ops);
>  	}
> diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
> index 7e99ad02f1ba..040fc6570ddb 100644
> --- a/fs/ext4/ioctl.c
> +++ b/fs/ext4/ioctl.c
> @@ -790,7 +790,7 @@ long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
>  				 "Online defrag not supported with bigalloc");
>  			err = -EOPNOTSUPP;
>  			goto mext_out;
> -		} else if (IS_DAX(inode)) {
> +		} else if (IS_FSDAX(inode)) {
>  			ext4_msg(sb, KERN_ERR,
>  				 "Online defrag not supported with DAX");
>  			err = -EOPNOTSUPP;
> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> index 39bf464c35f1..933e12940181 100644
> --- a/fs/ext4/super.c
> +++ b/fs/ext4/super.c
> @@ -1161,7 +1161,7 @@ static int ext4_set_context(struct inode *inode, const void *ctx, size_t len,
>  	if (inode->i_ino == EXT4_ROOT_INO)
>  		return -EPERM;
>  
> -	if (WARN_ON_ONCE(IS_DAX(inode) && i_size_read(inode)))
> +	if (WARN_ON_ONCE(IS_FSDAX(inode) && i_size_read(inode)))
>  		return -EINVAL;
>  
>  	res = ext4_convert_inline_data(inode);
> 
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR