165 lines
5.0 KiB
C
165 lines
5.0 KiB
C
/*
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* Copyright (c) 2000-2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef __XFS_DQUOT_H__
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#define __XFS_DQUOT_H__
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/*
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* Dquots are structures that hold quota information about a user or a group,
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* much like inodes are for files. In fact, dquots share many characteristics
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* with inodes. However, dquots can also be a centralized resource, relative
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* to a collection of inodes. In this respect, dquots share some characteristics
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* of the superblock.
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* XFS dquots exploit both those in its algorithms. They make every attempt
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* to not be a bottleneck when quotas are on and have minimal impact, if any,
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* when quotas are off.
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*/
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struct xfs_mount;
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struct xfs_trans;
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/*
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* The incore dquot structure
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*/
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typedef struct xfs_dquot {
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uint dq_flags; /* various flags (XFS_DQ_*) */
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struct list_head q_lru; /* global free list of dquots */
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struct xfs_mount*q_mount; /* filesystem this relates to */
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struct xfs_trans*q_transp; /* trans this belongs to currently */
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uint q_nrefs; /* # active refs from inodes */
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xfs_daddr_t q_blkno; /* blkno of dquot buffer */
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int q_bufoffset; /* off of dq in buffer (# dquots) */
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xfs_fileoff_t q_fileoffset; /* offset in quotas file */
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struct xfs_dquot*q_gdquot; /* group dquot, hint only */
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xfs_disk_dquot_t q_core; /* actual usage & quotas */
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xfs_dq_logitem_t q_logitem; /* dquot log item */
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xfs_qcnt_t q_res_bcount; /* total regular nblks used+reserved */
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xfs_qcnt_t q_res_icount; /* total inos allocd+reserved */
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xfs_qcnt_t q_res_rtbcount;/* total realtime blks used+reserved */
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struct mutex q_qlock; /* quota lock */
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struct completion q_flush; /* flush completion queue */
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atomic_t q_pincount; /* dquot pin count */
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wait_queue_head_t q_pinwait; /* dquot pinning wait queue */
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} xfs_dquot_t;
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/*
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* Lock hierarchy for q_qlock:
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* XFS_QLOCK_NORMAL is the implicit default,
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* XFS_QLOCK_NESTED is the dquot with the higher id in xfs_dqlock2
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*/
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enum {
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XFS_QLOCK_NORMAL = 0,
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XFS_QLOCK_NESTED,
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};
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/*
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* Manage the q_flush completion queue embedded in the dquot. This completion
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* queue synchronizes processes attempting to flush the in-core dquot back to
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* disk.
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*/
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static inline void xfs_dqflock(xfs_dquot_t *dqp)
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{
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wait_for_completion(&dqp->q_flush);
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}
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static inline int xfs_dqflock_nowait(xfs_dquot_t *dqp)
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{
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return try_wait_for_completion(&dqp->q_flush);
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}
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static inline void xfs_dqfunlock(xfs_dquot_t *dqp)
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{
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complete(&dqp->q_flush);
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}
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static inline int xfs_dqlock_nowait(struct xfs_dquot *dqp)
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{
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return mutex_trylock(&dqp->q_qlock);
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}
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static inline void xfs_dqlock(struct xfs_dquot *dqp)
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{
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mutex_lock(&dqp->q_qlock);
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}
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static inline void xfs_dqunlock(struct xfs_dquot *dqp)
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{
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mutex_unlock(&dqp->q_qlock);
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}
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static inline int xfs_this_quota_on(struct xfs_mount *mp, int type)
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{
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switch (type & XFS_DQ_ALLTYPES) {
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case XFS_DQ_USER:
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return XFS_IS_UQUOTA_ON(mp);
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case XFS_DQ_GROUP:
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case XFS_DQ_PROJ:
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return XFS_IS_OQUOTA_ON(mp);
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default:
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return 0;
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}
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}
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static inline xfs_dquot_t *xfs_inode_dquot(struct xfs_inode *ip, int type)
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{
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switch (type & XFS_DQ_ALLTYPES) {
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case XFS_DQ_USER:
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return ip->i_udquot;
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case XFS_DQ_GROUP:
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case XFS_DQ_PROJ:
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return ip->i_gdquot;
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default:
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return NULL;
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}
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}
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#define XFS_DQ_IS_LOCKED(dqp) (mutex_is_locked(&((dqp)->q_qlock)))
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#define XFS_DQ_IS_DIRTY(dqp) ((dqp)->dq_flags & XFS_DQ_DIRTY)
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#define XFS_QM_ISUDQ(dqp) ((dqp)->dq_flags & XFS_DQ_USER)
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#define XFS_QM_ISPDQ(dqp) ((dqp)->dq_flags & XFS_DQ_PROJ)
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#define XFS_QM_ISGDQ(dqp) ((dqp)->dq_flags & XFS_DQ_GROUP)
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#define XFS_DQ_TO_QINF(dqp) ((dqp)->q_mount->m_quotainfo)
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#define XFS_DQ_TO_QIP(dqp) (XFS_QM_ISUDQ(dqp) ? \
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XFS_DQ_TO_QINF(dqp)->qi_uquotaip : \
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XFS_DQ_TO_QINF(dqp)->qi_gquotaip)
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extern int xfs_qm_dqread(struct xfs_mount *, xfs_dqid_t, uint,
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uint, struct xfs_dquot **);
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extern void xfs_qm_dqdestroy(xfs_dquot_t *);
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extern int xfs_qm_dqflush(struct xfs_dquot *, struct xfs_buf **);
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extern void xfs_qm_dqunpin_wait(xfs_dquot_t *);
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extern void xfs_qm_adjust_dqtimers(xfs_mount_t *,
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xfs_disk_dquot_t *);
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extern void xfs_qm_adjust_dqlimits(xfs_mount_t *,
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xfs_disk_dquot_t *);
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extern int xfs_qm_dqget(xfs_mount_t *, xfs_inode_t *,
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xfs_dqid_t, uint, uint, xfs_dquot_t **);
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extern void xfs_qm_dqput(xfs_dquot_t *);
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extern void xfs_dqlock2(struct xfs_dquot *, struct xfs_dquot *);
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static inline struct xfs_dquot *xfs_qm_dqhold(struct xfs_dquot *dqp)
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{
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xfs_dqlock(dqp);
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dqp->q_nrefs++;
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xfs_dqunlock(dqp);
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return dqp;
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}
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#endif /* __XFS_DQUOT_H__ */
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