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Re: [PATCH 31/37] xfs: move xfs_fsb_to_db to xfs_bmap.h

To: Dave Chinner <david@xxxxxxxxxxxxx>
Subject: Re: [PATCH 31/37] xfs: move xfs_fsb_to_db to xfs_bmap.h
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Sun, 29 Apr 2012 17:53:00 -0400
Cc: xfs@xxxxxxxxxxx
In-reply-to: <1335160747-17254-32-git-send-email-david@xxxxxxxxxxxxx>
References: <1335160747-17254-1-git-send-email-david@xxxxxxxxxxxxx> <1335160747-17254-32-git-send-email-david@xxxxxxxxxxxxx>
User-agent: Mutt/1.5.21 (2010-09-15)
On Mon, Apr 23, 2012 at 03:59:01PM +1000, Dave Chinner wrote:
> From: Dave Chinner <dchinner@xxxxxxxxxx>
> 
> This is the only remaining useful function in xfs_rw.h, so move it

Well, xfs_get_extsz_hint also still is useful, and you only move it in
the next patch.

> +/*
> + * Convert the given file system block to a disk block.  We have to treat it
> + * differently based on whether the file is a real time file or not, because 
> the
> + * bmap code does.
> + */

Might be worth alaborating why exactly.  When I last looked over it I
couldn't make much sense of it.

> +xfs_daddr_t
> +xfs_fsb_to_db(struct xfs_inode *ip, xfs_fsblock_t fsb)
> +{
> +     return (XFS_IS_REALTIME_INODE(ip) ? \
> +              (xfs_daddr_t)XFS_FSB_TO_BB((ip)->i_mount, (fsb)) : \
> +              XFS_FSB_TO_DADDR((ip)->i_mount, (fsb)));
> +}

Might be worth to "demacrofy" it while you're at it, e.g. rewrite it as:

xfs_daddr_t
xfs_fsb_to_db(struct xfs_inode *ip, xfs_fsblock_t fsb)
{
        if (XFS_IS_REALTIME_INODE(ip))
                return XFS_FSB_TO_BB(ip->i_mount, fsb);
        else
                return XFS_FSB_TO_DADDR(ip->i_mount, fsb);
}

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