linux-kernel - Re: [PATCH 4/5] buffer: Fix _

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Date: Mon, 8 Jan 2024 16:09:01 +0000
From: Matthew Wilcox <willy@...radead.org>
To: "Pankaj Raghav (Samsung)" <kernel@...kajraghav.com>
Cc: Jonathan Corbet <corbet@....net>, linux-doc@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/5] buffer: Fix __bread() kernel-doc

On Mon, Jan 08, 2024 at 03:58:08PM +0100, Pankaj Raghav (Samsung) wrote:
> On Thu, Jan 04, 2024 at 04:36:51PM +0000, Matthew Wilcox (Oracle) wrote:
> > The extra indentation confused the kernel-doc parser, so remove it.
> > Fix some other wording while I'm here, and advise the user they need to
> > call brelse() on this buffer.
> > 
> It looks like __bread_gfp has the same problem:

I'm happy to incorporate this patch, but I'll need your S-o-B on it.

> diff --git a/fs/buffer.c b/fs/buffer.c
> index 967f34b70aa8..cfdf45cc290a 100644
> --- a/fs/buffer.c
> +++ b/fs/buffer.c
> @@ -1446,16 +1446,18 @@ void __breadahead(struct block_device *bdev, sector_t block, unsigned size)
>  EXPORT_SYMBOL(__breadahead);
>  
>  /**
> - *  __bread_gfp() - reads a specified block and returns the bh
> - *  @bdev: the block_device to read from
> - *  @block: number of block
> - *  @size: size (in bytes) to read
> - *  @gfp: page allocation flag
> + * __bread_gfp() - Read a block.
> + * @bdev: The block device to read from.
> + * @block: Block number in units of block size.
> + * @size: Block size in bytes.
>   *
> - *  Reads a specified block, and returns buffer head that contains it.
> - *  The page cache can be allocated from non-movable area
> - *  not to prevent page migration if you set gfp to zero.
> - *  It returns NULL if the block was unreadable.
> + * Read a specified block, and return the buffer head that refers to it.
> + * The memory can be allocated from a non-movable area to not to prevent
> + * page migration if you set gfp to zero. The buffer head has its
> + * refcount elevated and the caller should call brelse() when it has
> + * finished with the buffer.
> + *
> + * Return: NULL if the block was unreadable.
>   */
>  struct buffer_head *
>  __bread_gfp(struct block_device *bdev, sector_t block,
> (END)
> 
> Another option is to just change this in __bread_gfp() and add a See
> __bread_gfp() in __bread()?