Re: [PATCH 07/16] GFS2: Directory handling

[Christoph Hellwig <hch@infradead.org>]

> +/*
> +* Implements Extendible Hashing as described in:
> +*   "Extendible Hashing" by Fagin, et al in
> +*     __ACM Trans. on Database Systems__, Sept 1979.
> +*
> +*

please follow the normal comment style, that is leave a space before the *
for block comments so it lines up nicely with the * in the start tag.

> +#include <linux/sched.h>
> +#include <linux/slab.h>
> +#include <linux/spinlock.h>
> +#include <linux/completion.h>

you don't seem to be using any completion in this file

> +#include <linux/buffer_head.h>
> +#include <linux/sort.h>
> +#include <linux/gfs2_ondisk.h>
> +#include <linux/crc32.h>
> +#include <linux/vmalloc.h>
> +#include <asm/semaphore.h>

you're not using any semaphore in this file

> +int gfs2_dir_get_buffer(struct gfs2_inode *ip, uint64_t block, int new,
> +		         struct buffer_head **bhp)
> +{
> +	struct buffer_head *bh;
> +	int error = 0;
> +
> +	if (new) {
> +		bh = gfs2_meta_new(ip->i_gl, block);
> +		gfs2_trans_add_bh(ip->i_gl, bh, 1);
> +		gfs2_metatype_set(bh, GFS2_METATYPE_JD, GFS2_FORMAT_JD);
> +		gfs2_buffer_clear_tail(bh, sizeof(struct gfs2_meta_header));
> +	} else {
> +		error = gfs2_meta_read(ip->i_gl, block, DIO_START | DIO_WAIT,
> +				       &bh);
> +		if (error)
> +			return error;
> +		if (gfs2_metatype_check(ip->i_sbd, bh, GFS2_METATYPE_JD)) {
> +			brelse(bh);
> +			return -EIO;
> +		}
> +	}
> +
> +	*bhp = bh;
> +	return 0;

the code is completely different for the new vs !new case, so there's no
point in merging it to a single function.