linux-kernel - Re: [PATCH 09/16 v4] pramfs: dir operations

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Date:	Wed, 24 Nov 2010 17:17:55 +0900
From:	Paul Mundt <lethal@...ux-sh.org>
To:	Marco Stornelli <marco.stornelli@...il.com>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>,
	Linux Embedded <linux-embedded@...r.kernel.org>,
	Linux FS Devel <linux-fsdevel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tim Bird <tim.bird@...sony.com>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: Re: [PATCH 09/16 v4] pramfs: dir operations

On Sat, Nov 20, 2010 at 11:00:45AM +0100, Marco Stornelli wrote:
> +int pram_add_link(struct dentry *dentry, struct inode *inode)
> +{
> +	struct inode *dir = dentry->d_parent->d_inode;
> +	struct pram_inode *pidir, *pi, *pitail = NULL;
> +	u64 tail_ino, prev_ino;
> +
> +	const char *name = dentry->d_name.name;
> +
> +	int namelen = dentry->d_name.len > PRAM_NAME_LEN ?
> +		PRAM_NAME_LEN : dentry->d_name.len;
> +

	namelen = min_t(unsigned int, dentry->d_name.len, PRAM_NAME_LEN);

?

> +#define S_SHIFT 12
> +static unsigned int dtype_by_mode[S_IFMT >> S_SHIFT] = {
> +	[S_IFREG >> S_SHIFT]    DT_REG,
> +	[S_IFDIR >> S_SHIFT]    DT_DIR,
> +	[S_IFCHR >> S_SHIFT]    DT_CHR,
> +	[S_IFBLK >> S_SHIFT]    DT_BLK,
> +	[S_IFIFO >> S_SHIFT]    DT_FIFO,
> +	[S_IFSOCK >> S_SHIFT]   DT_SOCK,
> +	[S_IFLNK >> S_SHIFT]    DT_LNK,
> +};
> +
> +static int pram_readdir(struct file *filp, void *dirent, filldir_t filldir)
> +{
...
> +		ret = filldir(dirent, name, namelen,
> +			      filp->f_pos, ino,
> +			      dtype_by_mode[(be16_to_cpu(pi->i_mode) & S_IFMT)>>S_SHIFT]);
> +		filp->f_pos = pi->i_d.d_next ? be64_to_cpu(pi->i_d.d_next) : 3;

You might try to provide some generic helpers for this, at least GFS2
also does the same thing:

include/linux/gfs2_ondisk.h:#define DT2IF(dt) (((dt) << 12) & S_IFMT)
include/linux/gfs2_ondisk.h:#define IF2DT(sif) (((sif) & S_IFMT) >> 12)
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