159 lines
5.2 KiB
C
159 lines
5.2 KiB
C
/*
|
|
* 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_DQUOT_H__
|
|
#define __XFS_DQUOT_H__
|
|
|
|
/*
|
|
* Dquots are structures that hold quota information about a user or a group,
|
|
* much like inodes are for files. In fact, dquots share many characteristics
|
|
* with inodes. However, dquots can also be a centralized resource, relative
|
|
* to a collection of inodes. In this respect, dquots share some characteristics
|
|
* of the superblock.
|
|
* XFS dquots exploit both those in its algorithms. They make every attempt
|
|
* to not be a bottleneck when quotas are on and have minimal impact, if any,
|
|
* when quotas are off.
|
|
*/
|
|
|
|
/*
|
|
* The hash chain headers (hash buckets)
|
|
*/
|
|
typedef struct xfs_dqhash {
|
|
struct list_head qh_list;
|
|
struct mutex qh_lock;
|
|
uint qh_version; /* ever increasing version */
|
|
uint qh_nelems; /* number of dquots on the list */
|
|
} xfs_dqhash_t;
|
|
|
|
struct xfs_mount;
|
|
struct xfs_trans;
|
|
|
|
/*
|
|
* The incore dquot structure
|
|
*/
|
|
typedef struct xfs_dquot {
|
|
uint dq_flags; /* various flags (XFS_DQ_*) */
|
|
struct list_head q_freelist; /* global free list of dquots */
|
|
struct list_head q_mplist; /* mount's list of dquots */
|
|
struct list_head q_hashlist; /* gloabl hash list of dquots */
|
|
xfs_dqhash_t *q_hash; /* the hashchain header */
|
|
struct xfs_mount*q_mount; /* filesystem this relates to */
|
|
struct xfs_trans*q_transp; /* trans this belongs to currently */
|
|
uint q_nrefs; /* # active refs from inodes */
|
|
xfs_daddr_t q_blkno; /* blkno of dquot buffer */
|
|
int q_bufoffset; /* off of dq in buffer (# dquots) */
|
|
xfs_fileoff_t q_fileoffset; /* offset in quotas file */
|
|
|
|
struct xfs_dquot*q_gdquot; /* group dquot, hint only */
|
|
xfs_disk_dquot_t q_core; /* actual usage & quotas */
|
|
xfs_dq_logitem_t q_logitem; /* dquot log item */
|
|
xfs_qcnt_t q_res_bcount; /* total regular nblks used+reserved */
|
|
xfs_qcnt_t q_res_icount; /* total inos allocd+reserved */
|
|
xfs_qcnt_t q_res_rtbcount;/* total realtime blks used+reserved */
|
|
struct mutex q_qlock; /* quota lock */
|
|
struct completion q_flush; /* flush completion queue */
|
|
atomic_t q_pincount; /* dquot pin count */
|
|
wait_queue_head_t q_pinwait; /* dquot pinning wait queue */
|
|
} xfs_dquot_t;
|
|
|
|
/*
|
|
* Lock hierarchy for q_qlock:
|
|
* XFS_QLOCK_NORMAL is the implicit default,
|
|
* XFS_QLOCK_NESTED is the dquot with the higher id in xfs_dqlock2
|
|
*/
|
|
enum {
|
|
XFS_QLOCK_NORMAL = 0,
|
|
XFS_QLOCK_NESTED,
|
|
};
|
|
|
|
/*
|
|
* Manage the q_flush completion queue embedded in the dquot. This completion
|
|
* queue synchronizes processes attempting to flush the in-core dquot back to
|
|
* disk.
|
|
*/
|
|
static inline void xfs_dqflock(xfs_dquot_t *dqp)
|
|
{
|
|
wait_for_completion(&dqp->q_flush);
|
|
}
|
|
|
|
static inline int xfs_dqflock_nowait(xfs_dquot_t *dqp)
|
|
{
|
|
return try_wait_for_completion(&dqp->q_flush);
|
|
}
|
|
|
|
static inline void xfs_dqfunlock(xfs_dquot_t *dqp)
|
|
{
|
|
complete(&dqp->q_flush);
|
|
}
|
|
|
|
static inline int xfs_dqlock_nowait(struct xfs_dquot *dqp)
|
|
{
|
|
return mutex_trylock(&dqp->q_qlock);
|
|
}
|
|
|
|
static inline void xfs_dqlock(struct xfs_dquot *dqp)
|
|
{
|
|
mutex_lock(&dqp->q_qlock);
|
|
}
|
|
|
|
static inline void xfs_dqunlock_nonotify(struct xfs_dquot *dqp)
|
|
{
|
|
mutex_unlock(&dqp->q_qlock);
|
|
}
|
|
|
|
#define XFS_DQ_IS_LOCKED(dqp) (mutex_is_locked(&((dqp)->q_qlock)))
|
|
#define XFS_DQ_IS_DIRTY(dqp) ((dqp)->dq_flags & XFS_DQ_DIRTY)
|
|
#define XFS_QM_ISUDQ(dqp) ((dqp)->dq_flags & XFS_DQ_USER)
|
|
#define XFS_QM_ISPDQ(dqp) ((dqp)->dq_flags & XFS_DQ_PROJ)
|
|
#define XFS_QM_ISGDQ(dqp) ((dqp)->dq_flags & XFS_DQ_GROUP)
|
|
#define XFS_DQ_TO_QINF(dqp) ((dqp)->q_mount->m_quotainfo)
|
|
#define XFS_DQ_TO_QIP(dqp) (XFS_QM_ISUDQ(dqp) ? \
|
|
XFS_DQ_TO_QINF(dqp)->qi_uquotaip : \
|
|
XFS_DQ_TO_QINF(dqp)->qi_gquotaip)
|
|
|
|
#define XFS_IS_THIS_QUOTA_OFF(d) (! (XFS_QM_ISUDQ(d) ? \
|
|
(XFS_IS_UQUOTA_ON((d)->q_mount)) : \
|
|
(XFS_IS_OQUOTA_ON((d)->q_mount))))
|
|
|
|
extern int xfs_qm_dqread(struct xfs_mount *, xfs_dqid_t, uint,
|
|
uint, struct xfs_dquot **);
|
|
extern void xfs_qm_dqdestroy(xfs_dquot_t *);
|
|
extern int xfs_qm_dqflush(xfs_dquot_t *, uint);
|
|
extern void xfs_qm_dqpurge(xfs_dquot_t *);
|
|
extern void xfs_qm_dqunpin_wait(xfs_dquot_t *);
|
|
extern void xfs_qm_adjust_dqtimers(xfs_mount_t *,
|
|
xfs_disk_dquot_t *);
|
|
extern void xfs_qm_adjust_dqlimits(xfs_mount_t *,
|
|
xfs_disk_dquot_t *);
|
|
extern int xfs_qm_dqget(xfs_mount_t *, xfs_inode_t *,
|
|
xfs_dqid_t, uint, uint, xfs_dquot_t **);
|
|
extern void xfs_qm_dqput(xfs_dquot_t *);
|
|
|
|
extern void xfs_dqlock2(struct xfs_dquot *, struct xfs_dquot *);
|
|
extern void xfs_dqunlock(struct xfs_dquot *);
|
|
extern void xfs_dqflock_pushbuf_wait(struct xfs_dquot *dqp);
|
|
|
|
static inline struct xfs_dquot *xfs_qm_dqhold(struct xfs_dquot *dqp)
|
|
{
|
|
xfs_dqlock(dqp);
|
|
dqp->q_nrefs++;
|
|
xfs_dqunlock(dqp);
|
|
return dqp;
|
|
}
|
|
|
|
#endif /* __XFS_DQUOT_H__ */
|