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_qa_alloc(struct gfs2_inode *ip);
  22 extern void gfs2_qa_delete(struct gfs2_inode *ip, atomic_t *wcount);
  23 extern int gfs2_quota_hold(struct gfs2_inode *ip, kuid_t uid, kgid_t gid);
  24 extern void gfs2_quota_unhold(struct gfs2_inode *ip);
  25
  26 extern int gfs2_quota_lock(struct gfs2_inode *ip, kuid_t uid, kgid_t gid);
  27 extern void gfs2_quota_unlock(struct gfs2_inode *ip);
  28
  29 extern int gfs2_quota_check(struct gfs2_inode *ip, kuid_t uid, kgid_t gid,
  30                             struct gfs2_alloc_parms *ap);
  31 extern void gfs2_quota_change(struct gfs2_inode *ip, s64 change,
  32                               kuid_t uid, kgid_t gid);
  33
  34 extern int gfs2_quota_sync(struct super_block *sb, int type);
  35 extern int gfs2_quota_refresh(struct gfs2_sbd *sdp, struct kqid qid);
  36
  37 extern int gfs2_quota_init(struct gfs2_sbd *sdp);
  38 extern void gfs2_quota_cleanup(struct gfs2_sbd *sdp);
  39 extern int gfs2_quotad(void *data);
  40
  41 extern void gfs2_wake_up_statfs(struct gfs2_sbd *sdp);
  42
  43 static 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
  49         ap->allowed = UINT_MAX; /* Assume we are permitted a whole lot */
  50         if (capable(CAP_SYS_RESOURCE) ||
  51             sdp->sd_args.ar_quota == GFS2_QUOTA_OFF)
  52                 return 0;
  53         ret = gfs2_quota_lock(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
  54         if (ret)
  55                 return ret;
  56         if (sdp->sd_args.ar_quota != GFS2_QUOTA_ON)
  57                 return 0;
  58         ret = gfs2_quota_check(ip, ip->i_inode.i_uid, ip->i_inode.i_gid, ap);
  59         if (ret)
  60                 gfs2_quota_unlock(ip);
  61         return ret;
  62 }
  63
  64 extern const struct quotactl_ops gfs2_quotactl_ops;
  65 extern struct shrinker gfs2_qd_shrinker;
  66 extern struct list_lru gfs2_qd_lru;
  67 extern void __init gfs2_quota_hash_init(void);
  68
  69 #endif /* __QUOTA_DOT_H__ */