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+/*
+ * Copyright (c) 2000-2002 Silicon Graphics, Inc. All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 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.
+ *
+ * Further, this software is distributed without any warranty that it is
+ * free of the rightful claim of any third person regarding infringement
+ * or the like. Any license provided herein, whether implied or
+ * otherwise, applies only to this software file. Patent licenses, if
+ * any, provided herein do not apply to combinations of this program with
+ * other software, or any other product whatsoever.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write the Free Software Foundation, Inc., 59
+ * Temple Place - Suite 330, Boston MA 02111-1307, USA.
+ *
+ * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
+ * Mountain View, CA 94043, or:
+ *
+ * http://www.sgi.com
+ *
+ * For further information regarding this notice, see:
+ *
+ * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
+ */
+#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 xfs_dquot *qh_next;
+ mutex_t qh_lock;
+ uint qh_version; /* ever increasing version */
+ uint qh_nelems; /* number of dquots on the list */
+} xfs_dqhash_t;
+
+typedef struct xfs_dqlink {
+ struct xfs_dquot *ql_next; /* forward link */
+ struct xfs_dquot **ql_prevp; /* pointer to prev ql_next */
+} xfs_dqlink_t;
+
+struct xfs_mount;
+struct xfs_trans;
+
+/*
+ * This is the marker which is designed to occupy the first few
+ * bytes of the xfs_dquot_t structure. Even inside this, the freelist pointers
+ * must come first.
+ * This serves as the marker ("sentinel") when we have to restart list
+ * iterations because of locking considerations.
+ */
+typedef struct xfs_dqmarker {
+ struct xfs_dquot*dqm_flnext; /* link to freelist: must be first */
+ struct xfs_dquot*dqm_flprev;
+ xfs_dqlink_t dqm_mplist; /* link to mount's list of dquots */
+ xfs_dqlink_t dqm_hashlist; /* link to the hash chain */
+ uint dqm_flags; /* various flags (XFS_DQ_*) */
+} xfs_dqmarker_t;
+
+/*
+ * The incore dquot structure
+ */
+typedef struct xfs_dquot {
+ xfs_dqmarker_t q_lists; /* list ptrs, q_flags (marker) */
+ 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 */
+ mutex_t q_qlock; /* quota lock */
+ sema_t q_flock; /* flush lock */
+ uint q_pincount; /* pin count for this dquot */
+ sv_t q_pinwait; /* sync var for pinning */
+#ifdef XFS_DQUOT_TRACE
+ struct ktrace *q_trace; /* trace header structure */
+#endif
+} xfs_dquot_t;
+
+
+#define dq_flnext q_lists.dqm_flnext
+#define dq_flprev q_lists.dqm_flprev
+#define dq_mplist q_lists.dqm_mplist
+#define dq_hashlist q_lists.dqm_hashlist
+#define dq_flags q_lists.dqm_flags
+
+#define XFS_DQHOLD(dqp) ((dqp)->q_nrefs++)
+
+/*
+ * Quota Accounting flags
+ */
+#define XFS_ALL_QUOTA_ACCT (XFS_UQUOTA_ACCT | XFS_GQUOTA_ACCT)
+#define XFS_ALL_QUOTA_ENFD (XFS_UQUOTA_ENFD | XFS_GQUOTA_ENFD)
+#define XFS_ALL_QUOTA_CHKD (XFS_UQUOTA_CHKD | XFS_GQUOTA_CHKD)
+#define XFS_ALL_QUOTA_ACTV (XFS_UQUOTA_ACTIVE | XFS_GQUOTA_ACTIVE)
+#define XFS_ALL_QUOTA_ACCT_ENFD (XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD|\
+ XFS_GQUOTA_ACCT|XFS_GQUOTA_ENFD)
+
+#define XFS_IS_QUOTA_RUNNING(mp) ((mp)->m_qflags & XFS_ALL_QUOTA_ACCT)
+#define XFS_IS_UQUOTA_RUNNING(mp) ((mp)->m_qflags & XFS_UQUOTA_ACCT)
+#define XFS_IS_GQUOTA_RUNNING(mp) ((mp)->m_qflags & XFS_GQUOTA_ACCT)
+
+/*
+ * Quota Limit Enforcement flags
+ */
+#define XFS_IS_QUOTA_ENFORCED(mp) ((mp)->m_qflags & XFS_ALL_QUOTA_ENFD)
+#define XFS_IS_UQUOTA_ENFORCED(mp) ((mp)->m_qflags & XFS_UQUOTA_ENFD)
+#define XFS_IS_GQUOTA_ENFORCED(mp) ((mp)->m_qflags & XFS_GQUOTA_ENFD)
+
+#ifdef DEBUG
+static inline int
+XFS_DQ_IS_LOCKED(xfs_dquot_t *dqp)
+{
+ if (mutex_trylock(&dqp->q_qlock)) {
+ mutex_unlock(&dqp->q_qlock);
+ return 0;
+ }
+ return 1;
+}
+#endif
+
+
+/*
+ * The following three routines simply manage the q_flock
+ * semaphore embedded in the dquot. This semaphore synchronizes
+ * processes attempting to flush the in-core dquot back to disk.
+ */
+#define xfs_dqflock(dqp) { psema(&((dqp)->q_flock), PINOD | PRECALC);\
+ (dqp)->dq_flags |= XFS_DQ_FLOCKED; }
+#define xfs_dqfunlock(dqp) { ASSERT(valusema(&((dqp)->q_flock)) <= 0); \
+ vsema(&((dqp)->q_flock)); \
+ (dqp)->dq_flags &= ~(XFS_DQ_FLOCKED); }
+
+#define XFS_DQ_PINLOCK(dqp) mutex_spinlock( \
+ &(XFS_DQ_TO_QINF(dqp)->qi_pinlock))
+#define XFS_DQ_PINUNLOCK(dqp, s) mutex_spinunlock( \
+ &(XFS_DQ_TO_QINF(dqp)->qi_pinlock), s)
+
+#define XFS_DQ_IS_FLUSH_LOCKED(dqp) (valusema(&((dqp)->q_flock)) <= 0)
+#define XFS_DQ_IS_ON_FREELIST(dqp) ((dqp)->dq_flnext != (dqp))
+#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_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_GQUOTA_ON((d)->q_mount))))
+
+#ifdef XFS_DQUOT_TRACE
+/*
+ * Dquot Tracing stuff.
+ */
+#define DQUOT_TRACE_SIZE 64
+#define DQUOT_KTRACE_ENTRY 1
+
+extern void __xfs_dqtrace_entry(xfs_dquot_t *dqp, char *func,
+ void *, xfs_inode_t *);
+#define xfs_dqtrace_entry_ino(a,b,ip) \
+ __xfs_dqtrace_entry((a), (b), (void*)__return_address, (ip))
+#define xfs_dqtrace_entry(a,b) \
+ __xfs_dqtrace_entry((a), (b), (void*)__return_address, NULL)
+#else
+#define xfs_dqtrace_entry(a,b)
+#define xfs_dqtrace_entry_ino(a,b,ip)
+#endif
+
+#ifdef QUOTADEBUG
+extern void xfs_qm_dqprint(xfs_dquot_t *);
+#else
+#define xfs_qm_dqprint(a)
+#endif
+
+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 *, uint);
+extern void xfs_qm_dqunpin_wait(xfs_dquot_t *);
+extern int xfs_qm_dqlock_nowait(xfs_dquot_t *);
+extern int xfs_qm_dqflock_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_dqwarn(xfs_disk_dquot_t *, uint);
+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_qm_dqrele(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__ */