xfs_qm.h

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/*
 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#ifndef __XFS_QM_H__
#define __XFS_QM_H__

#include "xfs_dquot_item.h"
#include "xfs_dquot.h"
#include "xfs_quota_priv.h"

struct xfs_inode;

extern struct kmem_zone *xfs_qm_dqtrxzone;

/*
 * This defines the unit of allocation of dquots.
 * Currently, it is just one file system block, and a 4K blk contains 30
 * (136 * 30 = 4080) dquots. It's probably not worth trying to make
 * this more dynamic.
 * XXXsup However, if this number is changed, we have to make sure that we don't
 * implicitly assume that we do allocations in chunks of a single filesystem
 * block in the dquot/xqm code.
 */
#define XFS_DQUOT_CLUSTER_SIZE_FSB  (xfs_filblks_t)1

/*
 * Various quota information for individual filesystems.
 * The mount structure keeps a pointer to this.
 */
typedef struct xfs_quotainfo {
    struct radix_tree_root qi_uquota_tree;
    struct radix_tree_root qi_gquota_tree;
    struct mutex qi_tree_lock;
    xfs_inode_t *qi_uquotaip;    /* user quota inode */
    xfs_inode_t *qi_gquotaip;    /* group quota inode */
    struct list_head qi_lru_list;
    struct mutex     qi_lru_lock;
    int      qi_lru_count;
    int      qi_dquots;
    time_t       qi_btimelimit;  /* limit for blks timer */
    time_t       qi_itimelimit;  /* limit for inodes timer */
    time_t       qi_rtbtimelimit;/* limit for rt blks timer */
    xfs_qwarncnt_t   qi_bwarnlimit;  /* limit for blks warnings */
    xfs_qwarncnt_t   qi_iwarnlimit;  /* limit for inodes warnings */
    xfs_qwarncnt_t   qi_rtbwarnlimit;/* limit for rt blks warnings */
    struct mutex     qi_quotaofflock;/* to serialize quotaoff */
    xfs_filblks_t    qi_dqchunklen;  /* # BBs in a chunk of dqs */
    uint         qi_dqperchunk;  /* # ondisk dqs in above chunk */
    xfs_qcnt_t   qi_bhardlimit;  /* default data blk hard limit */
    xfs_qcnt_t   qi_bsoftlimit;  /* default data blk soft limit */
    xfs_qcnt_t   qi_ihardlimit;  /* default inode count hard limit */
    xfs_qcnt_t   qi_isoftlimit;  /* default inode count soft limit */
    xfs_qcnt_t   qi_rtbhardlimit;/* default realtime blk hard limit */
    xfs_qcnt_t   qi_rtbsoftlimit;/* default realtime blk soft limit */
    struct shrinker  qi_shrinker;
} xfs_quotainfo_t;

#define XFS_DQUOT_TREE(qi, type) \
    ((type & XFS_DQ_USER) ? \
     &((qi)->qi_uquota_tree) : \
     &((qi)->qi_gquota_tree))


extern void xfs_trans_mod_dquot(xfs_trans_t *, xfs_dquot_t *, uint, long);
extern int  xfs_trans_reserve_quota_bydquots(xfs_trans_t *, xfs_mount_t *,
            xfs_dquot_t *, xfs_dquot_t *, long, long, uint);
extern void xfs_trans_dqjoin(xfs_trans_t *, xfs_dquot_t *);
extern void xfs_trans_log_dquot(xfs_trans_t *, xfs_dquot_t *);

/*
 * We keep the usr and grp dquots separately so that locking will be easier
 * to do at commit time. All transactions that we know of at this point
 * affect no more than two dquots of one type. Hence, the TRANS_MAXDQS value.
 */
#define XFS_QM_TRANS_MAXDQS     2
typedef struct xfs_dquot_acct {
    xfs_dqtrx_t dqa_usrdquots[XFS_QM_TRANS_MAXDQS];
    xfs_dqtrx_t dqa_grpdquots[XFS_QM_TRANS_MAXDQS];
} xfs_dquot_acct_t;

/*
 * Users are allowed to have a usage exceeding their softlimit for
 * a period this long.
 */
#define XFS_QM_BTIMELIMIT   (7 * 24*60*60)          /* 1 week */
#define XFS_QM_RTBTIMELIMIT (7 * 24*60*60)          /* 1 week */
#define XFS_QM_ITIMELIMIT   (7 * 24*60*60)          /* 1 week */

#define XFS_QM_BWARNLIMIT   5
#define XFS_QM_IWARNLIMIT   5
#define XFS_QM_RTBWARNLIMIT 5

extern void     xfs_qm_destroy_quotainfo(xfs_mount_t *);
extern int      xfs_qm_quotacheck(xfs_mount_t *);
extern int      xfs_qm_write_sb_changes(xfs_mount_t *, __int64_t);

/* dquot stuff */
extern void     xfs_qm_dqpurge_all(xfs_mount_t *, uint);
extern void     xfs_qm_dqrele_all_inodes(xfs_mount_t *, uint);

/* quota ops */
extern int      xfs_qm_scall_trunc_qfiles(xfs_mount_t *, uint);
extern int      xfs_qm_scall_getquota(xfs_mount_t *, xfs_dqid_t, uint,
                    fs_disk_quota_t *);
extern int      xfs_qm_scall_setqlim(xfs_mount_t *, xfs_dqid_t, uint,
                    fs_disk_quota_t *);
extern int      xfs_qm_scall_getqstat(xfs_mount_t *, fs_quota_stat_t *);
extern int      xfs_qm_scall_quotaon(xfs_mount_t *, uint);
extern int      xfs_qm_scall_quotaoff(xfs_mount_t *, uint);

#endif /* __XFS_QM_H__ */