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 struct gfs2_inode;
  14 struct gfs2_sbd;
  15 struct shrink_control;
  16
  17 #define NO_UID_QUOTA_CHANGE INVALID_UID
  18 #define NO_GID_QUOTA_CHANGE INVALID_GID
  19
  20 extern int gfs2_quota_hold(struct gfs2_inode *ip, kuid_t uid, kgid_t gid);
  21 extern void gfs2_quota_unhold(struct gfs2_inode *ip);
  22
  23 extern int gfs2_quota_lock(struct gfs2_inode *ip, kuid_t uid, kgid_t gid);
  24 extern void gfs2_quota_unlock(struct gfs2_inode *ip);
  25
  26 extern int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid);
  27 extern void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
  28                               kuid_t uid, kgid_t gid);
  29
  30 extern int gfs2_quota_sync(struct super_block *sb, int type);
  31 extern int gfs2_quota_refresh(struct gfs2_sbd *sdp, struct kqid qid);
  32
  33 extern int gfs2_quota_init(struct gfs2_sbd *sdp);
  34 extern void gfs2_quota_cleanup(struct gfs2_sbd *sdp);
  35 extern int gfs2_quotad(void *data);
  36
  37 extern void gfs2_wake_up_statfs(struct gfs2_sbd *sdp);
  38
  39 static inline int gfs2_quota_lock_check(struct gfs2_inode *ip)
  40 {
  41         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
  42         int ret;
  43         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
  44                 return 0;
  45         ret = gfs2_quota_lock(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
  46         if (ret)
  47                 return ret;
  48         if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
  49                 return 0;
  50         ret = gfs2_quota_check(ip, ip->i_inode.i_uid, ip->i_inode.i_gid);
  51         if (ret)
  52                 gfs2_quota_unlock(ip);
  53         return ret;
  54 }
  55
  56 extern unsigned long gfs2_qd_shrink_count(struct shrinker *shrink,
  57                                           struct shrink_control *sc);
  58 extern unsigned long gfs2_qd_shrink_scan(struct shrinker *shrink,
  59                                          struct shrink_control *sc);
  60 extern const struct quotactl_ops gfs2_quotactl_ops;
  61
  62 #endif /* __QUOTA_DOT_H__ */