LXR linux/fs/gfs2/quota.h

   1/*
   2 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3 * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
   4 *
   5 * This copyrighted material is made available to anyone wishing to use,
   6 * modify, copy, or redistribute it subject to the terms and conditions
   7 * of the GNU General Public License version 2.
   8 */
   9
  10#ifndef __QUOTA_DOT_H__
  11#define __QUOTA_DOT_H__
  12
  13#include <linux/list_lru.h>
  14
  15struct gfs2_inode;
  16struct gfs2_sbd;
  17
  18#define NO_UID_QUOTA_CHANGE INVALID_UID
  19#define NO_GID_QUOTA_CHANGE INVALID_GID
  20
  21extern int gfs2_qa_alloc(struct gfs2_inode *ip);
  22extern void gfs2_qa_delete(struct gfs2_inode *ip, atomic_t *wcount);
  23extern int gfs2_quota_hold(struct gfs2_inode *ip, kuid_t uid, kgid_t gid);
  24extern void gfs2_quota_unhold(struct gfs2_inode *ip);
  25
  26extern int gfs2_quota_lock(struct gfs2_inode *ip, kuid_t uid, kgid_t gid);
  27extern void gfs2_quota_unlock(struct gfs2_inode *ip);
  28
  29extern int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid,
  30                            struct gfs2_alloc_parms *ap);
  31extern void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
  32                              kuid_t uid, kgid_t gid);
  33
  34extern int gfs2_quota_sync(struct super_block *sb, int type);
  35extern int gfs2_quota_refresh(struct gfs2_sbd *sdp, struct kqid qid);
  36
  37extern int gfs2_quota_init(struct gfs2_sbd *sdp);
  38extern void gfs2_quota_cleanup(struct gfs2_sbd *sdp);
  39extern int gfs2_quotad(void *data);
  40
  41extern void gfs2_wake_up_statfs(struct gfs2_sbd *sdp);
  42
  43static inline int gfs2_quota_lock_check(struct gfs2_inode *ip,
  44                                        struct gfs2_alloc_parms *ap)
  45{
  46        struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
  47        int ret;
  48        if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
  49                return 0;
  50        ret = gfs2_quota_lock(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
  51        if (ret)
  52                return ret;
  53        if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
  54                return 0;
  55        ret = gfs2_quota_check(ip, ip->i_inode.i_uid, ip->i_inode.i_gid, ap);
  56        if (ret)
  57                gfs2_quota_unlock(ip);
  58        return ret;
  59}
  60
  61extern const struct quotactl_ops gfs2_quotactl_ops;
  62extern struct shrinker gfs2_qd_shrinker;
  63extern struct list_lru gfs2_qd_lru;
  64extern void __init gfs2_quota_hash_init(void);
  65
  66#endif /* __QUOTA_DOT_H__ */
  67