release/src-rt-6.x.4708/linux/linux-2.6.36/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
  16 #define NO_QUOTA_CHANGE ((u32)-1)
  17
  18 extern int gfs2_quota_hold(struct gfs2_inode *ip, u32 uid, u32 gid);
  19 extern void gfs2_quota_unhold(struct gfs2_inode *ip);
  20
  21 extern int gfs2_quota_lock(struct gfs2_inode *ip, u32 uid, u32 gid);
  22 extern void gfs2_quota_unlock(struct gfs2_inode *ip);
  23
  24 extern int gfs2_quota_check(struct gfs2_inode *ip, u32 uid, u32 gid);
  25 extern void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
  26                               u32 uid, u32 gid);
  27
  28 extern int gfs2_quota_sync(struct super_block *sb, int type, int wait);
  29 extern int gfs2_quota_refresh(struct gfs2_sbd *sdp, int user, u32 id);
  30
  31 extern int gfs2_quota_init(struct gfs2_sbd *sdp);
  32 extern void gfs2_quota_cleanup(struct gfs2_sbd *sdp);
  33 extern int gfs2_quotad(void *data);
  34
  35 extern void gfs2_wake_up_statfs(struct gfs2_sbd *sdp);
  36
  37 static inline int gfs2_quota_lock_check(struct gfs2_inode *ip)
  38 {
  39         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
  40         int ret;
  41         if (sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
  42                 return 0;
  43         ret = gfs2_quota_lock(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
  44         if (ret)
  45                 return ret;
  46         if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
  47                 return 0;
  48         ret = gfs2_quota_check(ip, ip->i_inode.i_uid, ip->i_inode.i_gid);
  49         if (ret)
  50                 gfs2_quota_unlock(ip);
  51         return ret;
  52 }
  53
  54 extern int gfs2_shrink_qd_memory(struct shrinker *shrink, int nr, gfp_t gfp_mask);
  55 extern const struct quotactl_ops gfs2_quotactl_ops;
  56
  57 #endif /* __QUOTA_DOT_H__ */