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
  15 struct gfs2_inode;
  16 struct gfs2_sbd;
  17
  18 #define NO_UID_QUOTA_CHANGE INVALID_UID
  19 #define NO_GID_QUOTA_CHANGE INVALID_GID
  20
  21 extern int gfs2_quota_hold(struct gfs2_inode *ip, kuid_t uid, kgid_t gid);
  22 extern void gfs2_quota_unhold(struct gfs2_inode *ip);
  23
  24 extern int gfs2_quota_lock(struct gfs2_inode *ip, kuid_t uid, kgid_t gid);
  25 extern void gfs2_quota_unlock(struct gfs2_inode *ip);
  26
  27 extern int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid);
  28 extern void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
  29                               kuid_t uid, kgid_t gid);
  30
  31 extern int gfs2_quota_sync(struct super_block *sb, int type);
  32 extern int gfs2_quota_refresh(struct gfs2_sbd *sdp, struct kqid qid);
  33
  34 extern int gfs2_quota_init(struct gfs2_sbd *sdp);
  35 extern void gfs2_quota_cleanup(struct gfs2_sbd *sdp);
  36 extern int gfs2_quotad(void *data);
  37
  38 extern void gfs2_wake_up_statfs(struct gfs2_sbd *sdp);
  39
  40 static inline int gfs2_quota_lock_check(struct gfs2_inode *ip)
  41 {
  42         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
  43         int ret;
  44         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
  45                 return 0;
  46         ret = gfs2_quota_lock(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
  47         if (ret)
  48                 return ret;
  49         if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
  50                 return 0;
  51         ret = gfs2_quota_check(ip, ip->i_inode.i_uid, ip->i_inode.i_gid);
  52         if (ret)
  53                 gfs2_quota_unlock(ip);
  54         return ret;
  55 }
  56
  57 extern const struct quotactl_ops gfs2_quotactl_ops;
  58 extern struct shrinker gfs2_qd_shrinker;
  59 extern struct list_lru gfs2_qd_lru;
  60
  61 #endif /* __QUOTA_DOT_H__ */