205 lines
7.2 KiB
C
205 lines
7.2 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 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++)
|
|
|
|
#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_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))))
|
|
|
|
#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_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__ */
|