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

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Date:	Wed, 24 Nov 2010 09:30:13 +0100
From:	Marco Stornelli <marco.stornelli@...il.com>
To:	Paul Mundt <lethal@...ux-sh.org>
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

2010/11/24 Paul Mundt <lethal@...ux-sh.org>:
> 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);
>
> ?

Ok, I can use it, I have to check the type.

>
>> +#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)
>

I'll look at it.

Marco
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