> +/*
> +* 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.
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