patch-2.4.25 linux-2.4.25/fs/xfs/xfs_quota.h

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Lines: 356
Date: 2004-02-18 05:36:32.000000000 -0800
Orig file: linux-2.4.24/fs/xfs/xfs_quota.h
Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.24/fs/xfs/xfs_quota.h linux-2.4.25/fs/xfs/xfs_quota.h
@@ -0,0 +1,355 @@
+/*
+ * Copyright (c) 2000-2003 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_QUOTA_H__
+#define __XFS_QUOTA_H__
+
+/*
+ * The ondisk form of a dquot structure.
+ */
+#define XFS_DQUOT_MAGIC		0x4451		/* 'DQ' */
+#define XFS_DQUOT_VERSION	(u_int8_t)0x01	/* latest version number */
+
+/*
+ * uid_t and gid_t are hard-coded to 32 bits in the inode.
+ * Hence, an 'id' in a dquot is 32 bits..
+ */
+typedef __int32_t	xfs_dqid_t;
+
+/*
+ * Eventhough users may not have quota limits occupying all 64-bits,
+ * they may need 64-bit accounting. Hence, 64-bit quota-counters,
+ * and quota-limits. This is a waste in the common case, but hey ...
+ */
+typedef __uint64_t	xfs_qcnt_t;
+typedef __uint16_t	xfs_qwarncnt_t;
+
+/*
+ * This is the main portion of the on-disk representation of quota
+ * information for a user. This is the q_core of the xfs_dquot_t that
+ * is kept in kernel memory. We pad this with some more expansion room
+ * to construct the on disk structure.
+ */
+typedef struct	xfs_disk_dquot {
+/*16*/	u_int16_t	d_magic;	/* dquot magic = XFS_DQUOT_MAGIC */
+/*8 */	u_int8_t	d_version;	/* dquot version */
+/*8 */	u_int8_t	d_flags;	/* XFS_DQ_USER/PROJ/GROUP */
+/*32*/	xfs_dqid_t	d_id;		/* user,project,group id */
+/*64*/	xfs_qcnt_t	d_blk_hardlimit;/* absolute limit on disk blks */
+/*64*/	xfs_qcnt_t	d_blk_softlimit;/* preferred limit on disk blks */
+/*64*/	xfs_qcnt_t	d_ino_hardlimit;/* maximum # allocated inodes */
+/*64*/	xfs_qcnt_t	d_ino_softlimit;/* preferred inode limit */
+/*64*/	xfs_qcnt_t	d_bcount;	/* disk blocks owned by the user */
+/*64*/	xfs_qcnt_t	d_icount;	/* inodes owned by the user */
+/*32*/	__int32_t	d_itimer;	/* zero if within inode limits if not,
+					   this is when we refuse service */
+/*32*/	__int32_t	d_btimer;	/* similar to above; for disk blocks */
+/*16*/	xfs_qwarncnt_t	d_iwarns;	/* warnings issued wrt num inodes */
+/*16*/	xfs_qwarncnt_t	d_bwarns;	/* warnings issued wrt disk blocks */
+/*32*/	__int32_t	d_pad0;		/* 64 bit align */
+/*64*/	xfs_qcnt_t	d_rtb_hardlimit;/* absolute limit on realtime blks */
+/*64*/	xfs_qcnt_t	d_rtb_softlimit;/* preferred limit on RT disk blks */
+/*64*/	xfs_qcnt_t	d_rtbcount;	/* realtime blocks owned */
+/*32*/	__int32_t	d_rtbtimer;	/* similar to above; for RT disk blocks */
+/*16*/	xfs_qwarncnt_t	d_rtbwarns;	/* warnings issued wrt RT disk blocks */
+/*16*/	__uint16_t	d_pad;
+} xfs_disk_dquot_t;
+
+/*
+ * This is what goes on disk. This is separated from the xfs_disk_dquot because
+ * carrying the unnecessary padding would be a waste of memory.
+ */
+typedef struct xfs_dqblk {
+	xfs_disk_dquot_t  dd_diskdq;	/* portion that lives incore as well */
+	char		  dd_fill[32];	/* filling for posterity */
+} xfs_dqblk_t;
+
+/*
+ * flags for q_flags field in the dquot.
+ */
+#define XFS_DQ_USER		0x0001		/* a user quota */
+/* #define XFS_DQ_PROJ		0x0002		-- project quota (IRIX) */
+#define XFS_DQ_GROUP		0x0004		/* a group quota */
+#define XFS_DQ_FLOCKED		0x0008		/* flush lock taken */
+#define XFS_DQ_DIRTY		0x0010		/* dquot is dirty */
+#define XFS_DQ_WANT		0x0020		/* for lookup/reclaim race */
+#define XFS_DQ_INACTIVE		0x0040		/* dq off mplist & hashlist */
+#define XFS_DQ_MARKER		0x0080		/* sentinel */
+
+/*
+ * In the worst case, when both user and group quotas are on,
+ * we can have a max of three dquots changing in a single transaction.
+ */
+#define XFS_DQUOT_LOGRES(mp)	(sizeof(xfs_disk_dquot_t) * 3)
+
+
+/*
+ * These are the structures used to lay out dquots and quotaoff
+ * records on the log. Quite similar to those of inodes.
+ */
+
+/*
+ * log format struct for dquots.
+ * The first two fields must be the type and size fitting into
+ * 32 bits : log_recovery code assumes that.
+ */
+typedef struct xfs_dq_logformat {
+	__uint16_t		qlf_type;      /* dquot log item type */
+	__uint16_t		qlf_size;      /* size of this item */
+	xfs_dqid_t		qlf_id;	       /* usr/grp id number : 32 bits */
+	__int64_t		qlf_blkno;     /* blkno of dquot buffer */
+	__int32_t		qlf_len;       /* len of dquot buffer */
+	__uint32_t		qlf_boffset;   /* off of dquot in buffer */
+} xfs_dq_logformat_t;
+
+/*
+ * log format struct for QUOTAOFF records.
+ * The first two fields must be the type and size fitting into
+ * 32 bits : log_recovery code assumes that.
+ * We write two LI_QUOTAOFF logitems per quotaoff, the last one keeps a pointer
+ * to the first and ensures that the first logitem is taken out of the AIL
+ * only when the last one is securely committed.
+ */
+typedef struct xfs_qoff_logformat {
+	unsigned short		qf_type;	/* quotaoff log item type */
+	unsigned short		qf_size;	/* size of this item */
+	unsigned int		qf_flags;	/* USR and/or GRP */
+	char			qf_pad[12];	/* padding for future */
+} xfs_qoff_logformat_t;
+
+
+/*
+ * Disk quotas status in m_qflags, and also sb_qflags. 16 bits.
+ */
+#define XFS_UQUOTA_ACCT	0x0001  /* user quota accounting ON */
+#define XFS_UQUOTA_ENFD	0x0002  /* user quota limits enforced */
+#define XFS_UQUOTA_CHKD	0x0004  /* quotacheck run on usr quotas */
+#define XFS_PQUOTA_ACCT	0x0008  /* (IRIX) project quota accounting ON */
+#define XFS_GQUOTA_ENFD	0x0010  /* group quota limits enforced */
+#define XFS_GQUOTA_CHKD	0x0020  /* quotacheck run on grp quotas */
+#define XFS_GQUOTA_ACCT	0x0040  /* group quota accounting ON */
+
+/*
+ * Incore only flags for quotaoff - these bits get cleared when quota(s)
+ * are in the process of getting turned off. These flags are in m_qflags but
+ * never in sb_qflags.
+ */
+#define XFS_UQUOTA_ACTIVE	0x0080  /* uquotas are being turned off */
+#define XFS_GQUOTA_ACTIVE	0x0100  /* gquotas are being turned off */
+
+/*
+ * Checking XFS_IS_*QUOTA_ON() while holding any inode lock guarantees
+ * quota will be not be switched off as long as that inode lock is held.
+ */
+#define XFS_IS_QUOTA_ON(mp)	((mp)->m_qflags & (XFS_UQUOTA_ACTIVE | \
+						   XFS_GQUOTA_ACTIVE))
+#define XFS_IS_UQUOTA_ON(mp)	((mp)->m_qflags & XFS_UQUOTA_ACTIVE)
+#define XFS_IS_GQUOTA_ON(mp)	((mp)->m_qflags & XFS_GQUOTA_ACTIVE)
+
+/*
+ * Flags to tell various functions what to do. Not all of these are meaningful
+ * to a single function. None of these XFS_QMOPT_* flags are meant to have
+ * persistent values (ie. their values can and will change between versions)
+ */
+#define XFS_QMOPT_DQLOCK	0x0000001 /* dqlock */
+#define XFS_QMOPT_DQALLOC	0x0000002 /* alloc dquot ondisk if needed */
+#define XFS_QMOPT_UQUOTA	0x0000004 /* user dquot requested */
+#define XFS_QMOPT_GQUOTA	0x0000008 /* group dquot requested */
+#define XFS_QMOPT_FORCE_RES	0x0000010 /* ignore quota limits */
+#define XFS_QMOPT_DQSUSER	0x0000020 /* don't cache super users dquot */
+#define XFS_QMOPT_SBVERSION	0x0000040 /* change superblock version num */
+#define XFS_QMOPT_QUOTAOFF	0x0000080 /* quotas are being turned off */
+#define XFS_QMOPT_UMOUNTING	0x0000100 /* filesys is being unmounted */
+#define XFS_QMOPT_DOLOG		0x0000200 /* log buf changes (in quotacheck) */
+#define XFS_QMOPT_DOWARN        0x0000400 /* increase warning cnt if necessary */
+#define XFS_QMOPT_ILOCKED	0x0000800 /* inode is already locked (excl) */
+#define XFS_QMOPT_DQREPAIR	0x0001000 /* repair dquot, if damaged. */
+
+/*
+ * flags to xfs_trans_mod_dquot to indicate which field needs to be
+ * modified.
+ */
+#define XFS_QMOPT_RES_REGBLKS	0x0010000
+#define XFS_QMOPT_RES_RTBLKS	0x0020000
+#define XFS_QMOPT_BCOUNT	0x0040000
+#define XFS_QMOPT_ICOUNT	0x0080000
+#define XFS_QMOPT_RTBCOUNT	0x0100000
+#define XFS_QMOPT_DELBCOUNT	0x0200000
+#define XFS_QMOPT_DELRTBCOUNT	0x0400000
+#define XFS_QMOPT_RES_INOS	0x0800000
+
+/*
+ * flags for dqflush and dqflush_all.
+ */
+#define XFS_QMOPT_SYNC		0x1000000
+#define XFS_QMOPT_ASYNC		0x2000000
+#define XFS_QMOPT_DELWRI	0x4000000
+
+/*
+ * flags for dqalloc.
+ */
+#define XFS_QMOPT_INHERIT	0x8000000
+
+/*
+ * flags to xfs_trans_mod_dquot.
+ */
+#define XFS_TRANS_DQ_RES_BLKS	XFS_QMOPT_RES_REGBLKS
+#define XFS_TRANS_DQ_RES_RTBLKS	XFS_QMOPT_RES_RTBLKS
+#define XFS_TRANS_DQ_RES_INOS	XFS_QMOPT_RES_INOS
+#define XFS_TRANS_DQ_BCOUNT	XFS_QMOPT_BCOUNT
+#define XFS_TRANS_DQ_DELBCOUNT	XFS_QMOPT_DELBCOUNT
+#define XFS_TRANS_DQ_ICOUNT	XFS_QMOPT_ICOUNT
+#define XFS_TRANS_DQ_RTBCOUNT	XFS_QMOPT_RTBCOUNT
+#define XFS_TRANS_DQ_DELRTBCOUNT XFS_QMOPT_DELRTBCOUNT
+
+
+#define XFS_QMOPT_QUOTALL	(XFS_QMOPT_UQUOTA|XFS_QMOPT_GQUOTA)
+#define XFS_QMOPT_RESBLK_MASK	(XFS_QMOPT_RES_REGBLKS | XFS_QMOPT_RES_RTBLKS)
+
+#ifdef __KERNEL__
+/*
+ * This check is done typically without holding the inode lock;
+ * that may seem racey, but it is harmless in the context that it is used.
+ * The inode cannot go inactive as long a reference is kept, and
+ * therefore if dquot(s) were attached, they'll stay consistent.
+ * If, for example, the ownership of the inode changes while
+ * we didn't have the inode locked, the appropriate dquot(s) will be
+ * attached atomically.
+ */
+#define XFS_NOT_DQATTACHED(mp, ip) ((XFS_IS_UQUOTA_ON(mp) &&\
+				     (ip)->i_udquot == NULL) || \
+				    (XFS_IS_GQUOTA_ON(mp) && \
+				     (ip)->i_gdquot == NULL))
+
+#define XFS_QM_NEED_QUOTACHECK(mp) ((XFS_IS_UQUOTA_ON(mp) && \
+				     (mp->m_sb.sb_qflags & \
+				      XFS_UQUOTA_CHKD) == 0) || \
+				    (XFS_IS_GQUOTA_ON(mp) && \
+				     (mp->m_sb.sb_qflags & \
+				      XFS_GQUOTA_CHKD) == 0))
+
+#define XFS_MOUNT_QUOTA_ALL	(XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD|\
+				 XFS_UQUOTA_CHKD|XFS_GQUOTA_ACCT|\
+				 XFS_GQUOTA_ENFD|XFS_GQUOTA_CHKD)
+#define XFS_MOUNT_QUOTA_MASK	(XFS_MOUNT_QUOTA_ALL | XFS_UQUOTA_ACTIVE | \
+				 XFS_GQUOTA_ACTIVE)
+
+
+/*
+ * The structure kept inside the xfs_trans_t keep track of dquot changes
+ * within a transaction and apply them later.
+ */
+typedef struct xfs_dqtrx {
+	struct xfs_dquot *qt_dquot;	  /* the dquot this refers to */
+	ulong		qt_blk_res;	  /* blks reserved on a dquot */
+	ulong		qt_blk_res_used;  /* blks used from the reservation */
+	ulong		qt_ino_res;	  /* inode reserved on a dquot */
+	ulong		qt_ino_res_used;  /* inodes used from the reservation */
+	long		qt_bcount_delta;  /* dquot blk count changes */
+	long		qt_delbcnt_delta; /* delayed dquot blk count changes */
+	long		qt_icount_delta;  /* dquot inode count changes */
+	ulong		qt_rtblk_res;	  /* # blks reserved on a dquot */
+	ulong		qt_rtblk_res_used;/* # blks used from reservation */
+	long		qt_rtbcount_delta;/* dquot realtime blk changes */
+	long		qt_delrtb_delta;  /* delayed RT blk count changes */
+} xfs_dqtrx_t;
+
+/*
+ * Dquot transaction functions, used if quota is enabled.
+ */
+typedef void	(*qo_dup_dqinfo_t)(struct xfs_trans *, struct xfs_trans *);
+typedef void	(*qo_mod_dquot_byino_t)(struct xfs_trans *,
+				struct xfs_inode *, uint, long);
+typedef void	(*qo_free_dqinfo_t)(struct xfs_trans *);
+typedef void	(*qo_apply_dquot_deltas_t)(struct xfs_trans *);
+typedef void	(*qo_unreserve_and_mod_dquots_t)(struct xfs_trans *);
+typedef int	(*qo_reserve_quota_nblks_t)(
+				struct xfs_trans *, struct xfs_mount *,
+				struct xfs_inode *, long, long, uint);
+typedef int	(*qo_reserve_quota_bydquots_t)(
+				struct xfs_trans *, struct xfs_mount *,
+				struct xfs_dquot *, struct xfs_dquot *,
+				long, long, uint);
+typedef struct xfs_dqtrxops {
+	qo_dup_dqinfo_t			qo_dup_dqinfo;
+	qo_free_dqinfo_t		qo_free_dqinfo;
+	qo_mod_dquot_byino_t		qo_mod_dquot_byino;
+	qo_apply_dquot_deltas_t		qo_apply_dquot_deltas;
+	qo_reserve_quota_nblks_t	qo_reserve_quota_nblks;
+	qo_reserve_quota_bydquots_t	qo_reserve_quota_bydquots;
+	qo_unreserve_and_mod_dquots_t	qo_unreserve_and_mod_dquots;
+} xfs_dqtrxops_t;
+
+#define XFS_DQTRXOP(mp, tp, op, args...) \
+			((mp)->m_qm_ops.xfs_dqtrxops ? \
+			((mp)->m_qm_ops.xfs_dqtrxops->op)(tp, ## args) : 0)
+
+#define XFS_TRANS_DUP_DQINFO(mp, otp, ntp) \
+	XFS_DQTRXOP(mp, otp, qo_dup_dqinfo, ntp)
+#define XFS_TRANS_FREE_DQINFO(mp, tp) \
+	XFS_DQTRXOP(mp, tp, qo_free_dqinfo)
+#define XFS_TRANS_MOD_DQUOT_BYINO(mp, tp, ip, field, delta) \
+	XFS_DQTRXOP(mp, tp, qo_mod_dquot_byino, ip, field, delta)
+#define XFS_TRANS_APPLY_DQUOT_DELTAS(mp, tp) \
+	XFS_DQTRXOP(mp, tp, qo_apply_dquot_deltas)
+#define XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, tp, ip, nblks, ninos, fl) \
+	XFS_DQTRXOP(mp, tp, qo_reserve_quota_nblks, mp, ip, nblks, ninos, fl)
+#define XFS_TRANS_RESERVE_QUOTA_BYDQUOTS(mp, tp, ud, gd, nb, ni, fl) \
+	XFS_DQTRXOP(mp, tp, qo_reserve_quota_bydquots, mp, ud, gd, nb, ni, fl)
+#define XFS_TRANS_UNRESERVE_AND_MOD_DQUOTS(mp, tp) \
+	XFS_DQTRXOP(mp, tp, qo_unreserve_and_mod_dquots)
+
+#define XFS_TRANS_RESERVE_BLKQUOTA(mp, tp, ip, nblks) \
+	XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, tp, ip, nblks, 0, \
+				XFS_QMOPT_RES_REGBLKS)
+#define XFS_TRANS_RESERVE_BLKQUOTA_FORCE(mp, tp, ip, nblks) \
+	XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, tp, ip, nblks, 0, \
+				XFS_QMOPT_RES_REGBLKS | XFS_QMOPT_FORCE_RES)
+#define XFS_TRANS_UNRESERVE_BLKQUOTA(mp, tp, ip, nblks) \
+	XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, tp, ip, -(nblks), 0, \
+				XFS_QMOPT_RES_REGBLKS)
+#define XFS_TRANS_RESERVE_QUOTA(mp, tp, ud, gd, nb, ni, f) \
+	XFS_TRANS_RESERVE_QUOTA_BYDQUOTS(mp, tp, ud, gd, nb, ni, \
+				f | XFS_QMOPT_RES_REGBLKS)
+#define XFS_TRANS_UNRESERVE_QUOTA(mp, tp, ud, gd, nb, ni, f) \
+	XFS_TRANS_RESERVE_QUOTA_BYDQUOTS(mp, tp, ud, gd, -(nb), -(ni), \
+				f | XFS_QMOPT_RES_REGBLKS)
+
+extern int xfs_qm_dqcheck(xfs_disk_dquot_t *, xfs_dqid_t, uint, uint, char *);
+
+extern struct bhv_vfsops xfs_qmops;
+
+extern void xfs_qm_init(void);
+extern void xfs_qm_exit(void);
+
+#endif	/* __KERNEL__ */
+
+#endif	/* __XFS_QUOTA_H__ */
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