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Diffstat (limited to 'fs/xfs/xfs_dquot.h')
| -rw-r--r-- | fs/xfs/xfs_dquot.h | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/fs/xfs/xfs_dquot.h b/fs/xfs/xfs_dquot.h new file mode 100644 index 0000000..34b7e94 --- /dev/null +++ b/fs/xfs/xfs_dquot.h @@ -0,0 +1,137 @@ +/* + * 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, +}; + +#define XFS_DQHOLD(dqp) ((dqp)->q_nrefs++) + +/* + * 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); +} + +#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 void xfs_qm_dqdestroy(xfs_dquot_t *); +extern int xfs_qm_dqflush(xfs_dquot_t *, uint); +extern int xfs_qm_dqpurge(xfs_dquot_t *); +extern void xfs_qm_dqunpin_wait(xfs_dquot_t *); +extern int xfs_qm_dqlock_nowait(xfs_dquot_t *); +extern void xfs_qm_dqflock_pushbuf_wait(xfs_dquot_t *dqp); +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_dqlock(xfs_dquot_t *); +extern void xfs_dqlock2(xfs_dquot_t *, xfs_dquot_t *); +extern void xfs_dqunlock(xfs_dquot_t *); +extern void xfs_dqunlock_nonotify(xfs_dquot_t *); + +#endif /* __XFS_DQUOT_H__ */ |