original development tree for Linux kernel GTP module; now long in mainline.
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/*
* seglist.h - expediential structure and routines to handle list of segments
* (would be removed in a future release)
*
* Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Written by Ryusuke Konishi <ryusuke@osrg.net>
*
*/
#ifndef _NILFS_SEGLIST_H
#define _NILFS_SEGLIST_H
#include <linux/fs.h>
#include <linux/buffer_head.h>
#include <linux/nilfs2_fs.h>
#include "sufile.h"
struct nilfs_segment_entry {
__u64 segnum;
#define NILFS_SLH_FREED 0x0001 /* The segment was freed provisonally.
It must be cancelled if
construction aborted */
unsigned flags;
struct list_head list;
struct buffer_head *bh_su;
struct nilfs_segment_usage *raw_su;
};
void nilfs_dispose_segment_list(struct list_head *);
static inline struct nilfs_segment_entry *
nilfs_alloc_segment_entry(__u64 segnum)
{
struct nilfs_segment_entry *ent = kmalloc(sizeof(*ent), GFP_NOFS);
if (likely(ent)) {
ent->segnum = segnum;
ent->flags = 0;
ent->bh_su = NULL;
ent->raw_su = NULL;
INIT_LIST_HEAD(&ent->list);
}
return ent;
}
static inline int nilfs_open_segment_entry(struct nilfs_segment_entry *ent,
struct inode *sufile)
{
return nilfs_sufile_get_segment_usage(sufile, ent->segnum,
&ent->raw_su, &ent->bh_su);
}
static inline void nilfs_close_segment_entry(struct nilfs_segment_entry *ent,
struct inode *sufile)
{
if (!ent->bh_su)
return;
nilfs_sufile_put_segment_usage(sufile, ent->segnum, ent->bh_su);
ent->bh_su = NULL;
ent->raw_su = NULL;
}
static inline void nilfs_free_segment_entry(struct nilfs_segment_entry *ent)
{
kfree(ent);
}
#endif /* _NILFS_SEGLIST_H */