fs/xfs/xfs_quota.h - maze/linux - Git at Google

 /*
  * 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_QUOTA_H__
 #define __XFS_QUOTA_H__

 struct xfs_trans;

 /*
  * 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 __uint32_t	xfs_dqid_t;

 /*
  * Even though 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 {
 	__be16		d_magic;	/* dquot magic = XFS_DQUOT_MAGIC */
 	__u8		d_version;	/* dquot version */
 	__u8		d_flags;	/* XFS_DQ_USER/PROJ/GROUP */
 	__be32		d_id;		/* user,project,group id */
 	__be64		d_blk_hardlimit;/* absolute limit on disk blks */
 	__be64		d_blk_softlimit;/* preferred limit on disk blks */
 	__be64		d_ino_hardlimit;/* maximum # allocated inodes */
 	__be64		d_ino_softlimit;/* preferred inode limit */
 	__be64		d_bcount;	/* disk blocks owned by the user */
 	__be64		d_icount;	/* inodes owned by the user */
 	__be32		d_itimer;	/* zero if within inode limits if not,
 					   this is when we refuse service */
 	__be32		d_btimer;	/* similar to above; for disk blocks */
 	__be16		d_iwarns;	/* warnings issued wrt num inodes */
 	__be16		d_bwarns;	/* warnings issued wrt disk blocks */
 	__be32		d_pad0;		/* 64 bit align */
 	__be64		d_rtb_hardlimit;/* absolute limit on realtime blks */
 	__be64		d_rtb_softlimit;/* preferred limit on RT disk blks */
 	__be64		d_rtbcount;	/* realtime blocks owned */
 	__be32		d_rtbtimer;	/* similar to above; for RT disk blocks */
 	__be16		d_rtbwarns;	/* warnings issued wrt RT disk blocks */
 	__be16		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[4];	/* filling for posterity */

 	/*
 	 * These two are only present on filesystems with the CRC bits set.
 	 */
 	__be32		  dd_crc;	/* checksum */
 	__be64		  dd_lsn;	/* last modification in log */
 	uuid_t		  dd_uuid;	/* location information */
 } xfs_dqblk_t;

 #define XFS_DQUOT_CRC_OFF	offsetof(struct xfs_dqblk, dd_crc)

 /*
  * flags for q_flags field in the dquot.
  */
 #define XFS_DQ_USER		0x0001		/* a user quota */
 #define XFS_DQ_PROJ		0x0002		/* project quota */
 #define XFS_DQ_GROUP		0x0004		/* a group quota */
 #define XFS_DQ_DIRTY		0x0008		/* dquot is dirty */
 #define XFS_DQ_FREEING		0x0010		/* dquot is beeing torn down */

 #define XFS_DQ_ALLTYPES		(XFS_DQ_USER|XFS_DQ_PROJ|XFS_DQ_GROUP)

 #define XFS_DQ_FLAGS \
 	{ XFS_DQ_USER,		"USER" }, \
 	{ XFS_DQ_PROJ,		"PROJ" }, \
 	{ XFS_DQ_GROUP,		"GROUP" }, \
 	{ XFS_DQ_DIRTY,		"DIRTY" }, \
 	{ XFS_DQ_FREEING,	"FREEING" }

 /*
  * 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/proj id : 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  /* project quota accounting ON */
 #define XFS_OQUOTA_ENFD	0x0010  /* other (grp/prj) quota limits enforced */
 #define XFS_OQUOTA_CHKD	0x0020  /* quotacheck run on other (grp/prj) quotas */
 #define XFS_GQUOTA_ACCT	0x0040  /* group quota accounting ON */

 /*
  * Conversion to and from the combined OQUOTA flag (if necessary)
  * is done only in xfs_sb_qflags_to_disk() and xfs_sb_qflags_from_disk()
  */
 #define XFS_GQUOTA_ENFD	0x0080  /* group quota limits enforced */
 #define XFS_GQUOTA_CHKD	0x0100  /* quotacheck run on group quotas */
 #define XFS_PQUOTA_ENFD	0x0200  /* project quota limits enforced */
 #define XFS_PQUOTA_CHKD	0x0400  /* quotacheck run on project quotas */

 /*
  * Quota Accounting/Enforcement flags
  */
 #define XFS_ALL_QUOTA_ACCT	\
 		(XFS_UQUOTA_ACCT | XFS_GQUOTA_ACCT | XFS_PQUOTA_ACCT)
 #define XFS_ALL_QUOTA_ENFD	\
 		(XFS_UQUOTA_ENFD | XFS_GQUOTA_ENFD | XFS_PQUOTA_ENFD)
 #define XFS_ALL_QUOTA_CHKD	\
 		(XFS_UQUOTA_CHKD | XFS_GQUOTA_CHKD | XFS_PQUOTA_CHKD)

 #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_PQUOTA_RUNNING(mp)	((mp)->m_qflags & XFS_PQUOTA_ACCT)
 #define XFS_IS_GQUOTA_RUNNING(mp)	((mp)->m_qflags & XFS_GQUOTA_ACCT)
 #define XFS_IS_UQUOTA_ENFORCED(mp)	((mp)->m_qflags & XFS_UQUOTA_ENFD)
 #define XFS_IS_GQUOTA_ENFORCED(mp)	((mp)->m_qflags & XFS_GQUOTA_ENFD)
 #define XFS_IS_PQUOTA_ENFORCED(mp)	((mp)->m_qflags & XFS_PQUOTA_ENFD)

 /*
  * 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	0x1000  /* uquotas are being turned off */
 #define XFS_GQUOTA_ACTIVE	0x2000  /* gquotas are being turned off */
 #define XFS_PQUOTA_ACTIVE	0x4000  /* pquotas are being turned off */
 #define XFS_ALL_QUOTA_ACTIVE	\
 	(XFS_UQUOTA_ACTIVE | XFS_GQUOTA_ACTIVE | XFS_PQUOTA_ACTIVE)

 /*
  * 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 | \
 						   XFS_PQUOTA_ACTIVE))
 #define XFS_IS_OQUOTA_ON(mp)	((mp)->m_qflags & (XFS_GQUOTA_ACTIVE | \
 						   XFS_PQUOTA_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)
 #define XFS_IS_PQUOTA_ON(mp)	((mp)->m_qflags & XFS_PQUOTA_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_DQALLOC	0x0000002 /* alloc dquot ondisk if needed */
 #define XFS_QMOPT_UQUOTA	0x0000004 /* user dquot requested */
 #define XFS_QMOPT_PQUOTA	0x0000008 /* project dquot requested */
 #define XFS_QMOPT_FORCE_RES	0x0000010 /* ignore quota limits */
 #define XFS_QMOPT_SBVERSION	0x0000040 /* change superblock version num */
 #define XFS_QMOPT_DOWARN        0x0000400 /* increase warning cnt if needed */
 #define XFS_QMOPT_DQREPAIR	0x0001000 /* repair dquot if damaged */
 #define XFS_QMOPT_GQUOTA	0x0002000 /* group dquot requested */
 #define XFS_QMOPT_ENOSPC	0x0004000 /* enospc instead of edquot (prj) */

 /*
  * 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 dqalloc.
  */
 #define XFS_QMOPT_INHERIT	0x1000000

 /*
  * 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_PQUOTA | 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 racy, 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_OQUOTA_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) || \
 	 (XFS_IS_PQUOTA_ON(mp) && \
 		(mp->m_sb.sb_qflags & XFS_PQUOTA_CHKD) == 0))

 #define XFS_MOUNT_QUOTA_SET1	(XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD|\
 				 XFS_UQUOTA_CHKD|XFS_GQUOTA_ACCT|\
 				 XFS_GQUOTA_ENFD|XFS_GQUOTA_CHKD)

 #define XFS_MOUNT_QUOTA_SET2	(XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD|\
 				 XFS_UQUOTA_CHKD|XFS_PQUOTA_ACCT|\
 				 XFS_PQUOTA_ENFD|XFS_PQUOTA_CHKD)

 #define XFS_MOUNT_QUOTA_ALL	(XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD|\
 				 XFS_UQUOTA_CHKD|XFS_GQUOTA_ACCT|\
 				 XFS_GQUOTA_ENFD|XFS_GQUOTA_CHKD|\
 				 XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD|\
 				 XFS_PQUOTA_CHKD)


 /*
  * 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;

 #ifdef CONFIG_XFS_QUOTA
 extern void xfs_trans_dup_dqinfo(struct xfs_trans *, struct xfs_trans *);
 extern void xfs_trans_free_dqinfo(struct xfs_trans *);
 extern void xfs_trans_mod_dquot_byino(struct xfs_trans *, struct xfs_inode *,
 		uint, long);
 extern void xfs_trans_apply_dquot_deltas(struct xfs_trans *);
 extern void xfs_trans_unreserve_and_mod_dquots(struct xfs_trans *);
 extern int xfs_trans_reserve_quota_nblks(struct xfs_trans *,
 		struct xfs_inode *, long, long, uint);
 extern int xfs_trans_reserve_quota_bydquots(struct xfs_trans *,
 		struct xfs_mount *, struct xfs_dquot *,
 		struct xfs_dquot *, long, long, uint);

 extern int xfs_qm_vop_dqalloc(struct xfs_inode *, uid_t, gid_t, prid_t, uint,
 		struct xfs_dquot **, struct xfs_dquot **);
 extern void xfs_qm_vop_create_dqattach(struct xfs_trans *, struct xfs_inode *,
 		struct xfs_dquot *, struct xfs_dquot *);
 extern int xfs_qm_vop_rename_dqattach(struct xfs_inode **);
 extern struct xfs_dquot *xfs_qm_vop_chown(struct xfs_trans *,
 		struct xfs_inode *, struct xfs_dquot **, struct xfs_dquot *);
 extern int xfs_qm_vop_chown_reserve(struct xfs_trans *, struct xfs_inode *,
 		struct xfs_dquot *, struct xfs_dquot *, uint);
 extern int xfs_qm_dqattach(struct xfs_inode *, uint);
 extern int xfs_qm_dqattach_locked(struct xfs_inode *, uint);
 extern void xfs_qm_dqdetach(struct xfs_inode *);
 extern void xfs_qm_dqrele(struct xfs_dquot *);
 extern void xfs_qm_statvfs(struct xfs_inode *, struct kstatfs *);
 extern int xfs_qm_newmount(struct xfs_mount *, uint *, uint *);
 extern void xfs_qm_mount_quotas(struct xfs_mount *);
 extern void xfs_qm_unmount(struct xfs_mount *);
 extern void xfs_qm_unmount_quotas(struct xfs_mount *);

 #else
 static inline int
 xfs_qm_vop_dqalloc(struct xfs_inode *ip, uid_t uid, gid_t gid, prid_t prid,
 		uint flags, struct xfs_dquot **udqp, struct xfs_dquot **gdqp)
 {
 	*udqp = NULL;
 	*gdqp = NULL;
 	return 0;
 }
 #define xfs_trans_dup_dqinfo(tp, tp2)
 #define xfs_trans_free_dqinfo(tp)
 #define xfs_trans_mod_dquot_byino(tp, ip, fields, delta)
 #define xfs_trans_apply_dquot_deltas(tp)
 #define xfs_trans_unreserve_and_mod_dquots(tp)
 static inline int xfs_trans_reserve_quota_nblks(struct xfs_trans *tp,
 		struct xfs_inode *ip, long nblks, long ninos, uint flags)
 {
 	return 0;
 }
 static inline int xfs_trans_reserve_quota_bydquots(struct xfs_trans *tp,
 		struct xfs_mount *mp, struct xfs_dquot *udqp,
 		struct xfs_dquot *gdqp, long nblks, long nions, uint flags)
 {
 	return 0;
 }
 #define xfs_qm_vop_create_dqattach(tp, ip, u, g)
 #define xfs_qm_vop_rename_dqattach(it)					(0)
 #define xfs_qm_vop_chown(tp, ip, old, new)				(NULL)
 #define xfs_qm_vop_chown_reserve(tp, ip, u, g, fl)			(0)
 #define xfs_qm_dqattach(ip, fl)						(0)
 #define xfs_qm_dqattach_locked(ip, fl)					(0)
 #define xfs_qm_dqdetach(ip)
 #define xfs_qm_dqrele(d)
 #define xfs_qm_statvfs(ip, s)
 #define xfs_qm_newmount(mp, a, b)					(0)
 #define xfs_qm_mount_quotas(mp)
 #define xfs_qm_unmount(mp)
 #define xfs_qm_unmount_quotas(mp)
 #endif /* CONFIG_XFS_QUOTA */

 #define xfs_trans_unreserve_quota_nblks(tp, ip, nblks, ninos, flags) \
 	xfs_trans_reserve_quota_nblks(tp, ip, -(nblks), -(ninos), flags)
 #define xfs_trans_reserve_quota(tp, mp, ud, gd, nb, ni, f) \
 	xfs_trans_reserve_quota_bydquots(tp, mp, ud, gd, nb, ni, \
 				f | XFS_QMOPT_RES_REGBLKS)

 extern int xfs_qm_dqcheck(struct xfs_mount *, xfs_disk_dquot_t *,
 				xfs_dqid_t, uint, uint, char *);
 extern int xfs_mount_reset_sbqflags(struct xfs_mount *);

 extern const struct xfs_buf_ops xfs_dquot_buf_ops;

 #endif	/* __KERNEL__ */
 #endif	/* __XFS_QUOTA_H__ */
	/*
	* 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_QUOTA_H__
	#define __XFS_QUOTA_H__

	struct xfs_trans;

	/*
	* 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 __uint32_t xfs_dqid_t;

	/*
	* Even though 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 {
	__be16 d_magic; /* dquot magic = XFS_DQUOT_MAGIC */
	__u8 d_version; /* dquot version */
	__u8 d_flags; /* XFS_DQ_USER/PROJ/GROUP */
	__be32 d_id; /* user,project,group id */
	__be64 d_blk_hardlimit;/* absolute limit on disk blks */
	__be64 d_blk_softlimit;/* preferred limit on disk blks */
	__be64 d_ino_hardlimit;/* maximum # allocated inodes */
	__be64 d_ino_softlimit;/* preferred inode limit */
	__be64 d_bcount; /* disk blocks owned by the user */
	__be64 d_icount; /* inodes owned by the user */
	__be32 d_itimer; /* zero if within inode limits if not,
	this is when we refuse service */
	__be32 d_btimer; /* similar to above; for disk blocks */
	__be16 d_iwarns; /* warnings issued wrt num inodes */
	__be16 d_bwarns; /* warnings issued wrt disk blocks */
	__be32 d_pad0; /* 64 bit align */
	__be64 d_rtb_hardlimit;/* absolute limit on realtime blks */
	__be64 d_rtb_softlimit;/* preferred limit on RT disk blks */
	__be64 d_rtbcount; /* realtime blocks owned */
	__be32 d_rtbtimer; /* similar to above; for RT disk blocks */
	__be16 d_rtbwarns; /* warnings issued wrt RT disk blocks */
	__be16 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[4]; /* filling for posterity */

	/*
	* These two are only present on filesystems with the CRC bits set.
	*/
	__be32 dd_crc; /* checksum */
	__be64 dd_lsn; /* last modification in log */
	uuid_t dd_uuid; /* location information */
	} xfs_dqblk_t;

	#define XFS_DQUOT_CRC_OFF offsetof(struct xfs_dqblk, dd_crc)

	/*
	* flags for q_flags field in the dquot.
	*/
	#define XFS_DQ_USER 0x0001 /* a user quota */
	#define XFS_DQ_PROJ 0x0002 /* project quota */
	#define XFS_DQ_GROUP 0x0004 /* a group quota */
	#define XFS_DQ_DIRTY 0x0008 /* dquot is dirty */
	#define XFS_DQ_FREEING 0x0010 /* dquot is beeing torn down */

	#define XFS_DQ_ALLTYPES (XFS_DQ_USER\|XFS_DQ_PROJ\|XFS_DQ_GROUP)

	#define XFS_DQ_FLAGS \
	{ XFS_DQ_USER, "USER" }, \
	{ XFS_DQ_PROJ, "PROJ" }, \
	{ XFS_DQ_GROUP, "GROUP" }, \
	{ XFS_DQ_DIRTY, "DIRTY" }, \
	{ XFS_DQ_FREEING, "FREEING" }

	/*
	* 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/proj id : 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 /* project quota accounting ON */
	#define XFS_OQUOTA_ENFD 0x0010 /* other (grp/prj) quota limits enforced */
	#define XFS_OQUOTA_CHKD 0x0020 /* quotacheck run on other (grp/prj) quotas */
	#define XFS_GQUOTA_ACCT 0x0040 /* group quota accounting ON */

	/*
	* Conversion to and from the combined OQUOTA flag (if necessary)
	* is done only in xfs_sb_qflags_to_disk() and xfs_sb_qflags_from_disk()
	*/
	#define XFS_GQUOTA_ENFD 0x0080 /* group quota limits enforced */
	#define XFS_GQUOTA_CHKD 0x0100 /* quotacheck run on group quotas */
	#define XFS_PQUOTA_ENFD 0x0200 /* project quota limits enforced */
	#define XFS_PQUOTA_CHKD 0x0400 /* quotacheck run on project quotas */

	/*
	* Quota Accounting/Enforcement flags
	*/
	#define XFS_ALL_QUOTA_ACCT \
	(XFS_UQUOTA_ACCT \| XFS_GQUOTA_ACCT \| XFS_PQUOTA_ACCT)
	#define XFS_ALL_QUOTA_ENFD \
	(XFS_UQUOTA_ENFD \| XFS_GQUOTA_ENFD \| XFS_PQUOTA_ENFD)
	#define XFS_ALL_QUOTA_CHKD \
	(XFS_UQUOTA_CHKD \| XFS_GQUOTA_CHKD \| XFS_PQUOTA_CHKD)

	#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_PQUOTA_RUNNING(mp) ((mp)->m_qflags & XFS_PQUOTA_ACCT)
	#define XFS_IS_GQUOTA_RUNNING(mp) ((mp)->m_qflags & XFS_GQUOTA_ACCT)
	#define XFS_IS_UQUOTA_ENFORCED(mp) ((mp)->m_qflags & XFS_UQUOTA_ENFD)
	#define XFS_IS_GQUOTA_ENFORCED(mp) ((mp)->m_qflags & XFS_GQUOTA_ENFD)
	#define XFS_IS_PQUOTA_ENFORCED(mp) ((mp)->m_qflags & XFS_PQUOTA_ENFD)

	/*
	* 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 0x1000 /* uquotas are being turned off */
	#define XFS_GQUOTA_ACTIVE 0x2000 /* gquotas are being turned off */
	#define XFS_PQUOTA_ACTIVE 0x4000 /* pquotas are being turned off */
	#define XFS_ALL_QUOTA_ACTIVE \
	(XFS_UQUOTA_ACTIVE \| XFS_GQUOTA_ACTIVE \| XFS_PQUOTA_ACTIVE)

	/*
	* 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 \| \
	XFS_PQUOTA_ACTIVE))
	#define XFS_IS_OQUOTA_ON(mp) ((mp)->m_qflags & (XFS_GQUOTA_ACTIVE \| \
	XFS_PQUOTA_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)
	#define XFS_IS_PQUOTA_ON(mp) ((mp)->m_qflags & XFS_PQUOTA_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_DQALLOC 0x0000002 /* alloc dquot ondisk if needed */
	#define XFS_QMOPT_UQUOTA 0x0000004 /* user dquot requested */
	#define XFS_QMOPT_PQUOTA 0x0000008 /* project dquot requested */
	#define XFS_QMOPT_FORCE_RES 0x0000010 /* ignore quota limits */
	#define XFS_QMOPT_SBVERSION 0x0000040 /* change superblock version num */
	#define XFS_QMOPT_DOWARN 0x0000400 /* increase warning cnt if needed */
	#define XFS_QMOPT_DQREPAIR 0x0001000 /* repair dquot if damaged */
	#define XFS_QMOPT_GQUOTA 0x0002000 /* group dquot requested */
	#define XFS_QMOPT_ENOSPC 0x0004000 /* enospc instead of edquot (prj) */

	/*
	* 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 dqalloc.
	*/
	#define XFS_QMOPT_INHERIT 0x1000000

	/*
	* 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_PQUOTA \| 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 racy, 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_OQUOTA_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) \|\| \
	(XFS_IS_PQUOTA_ON(mp) && \
	(mp->m_sb.sb_qflags & XFS_PQUOTA_CHKD) == 0))

	#define XFS_MOUNT_QUOTA_SET1 (XFS_UQUOTA_ACCT\|XFS_UQUOTA_ENFD\|\
	XFS_UQUOTA_CHKD\|XFS_GQUOTA_ACCT\|\
	XFS_GQUOTA_ENFD\|XFS_GQUOTA_CHKD)

	#define XFS_MOUNT_QUOTA_SET2 (XFS_UQUOTA_ACCT\|XFS_UQUOTA_ENFD\|\
	XFS_UQUOTA_CHKD\|XFS_PQUOTA_ACCT\|\
	XFS_PQUOTA_ENFD\|XFS_PQUOTA_CHKD)

	#define XFS_MOUNT_QUOTA_ALL (XFS_UQUOTA_ACCT\|XFS_UQUOTA_ENFD\|\
	XFS_UQUOTA_CHKD\|XFS_GQUOTA_ACCT\|\
	XFS_GQUOTA_ENFD\|XFS_GQUOTA_CHKD\|\
	XFS_PQUOTA_ACCT\|XFS_PQUOTA_ENFD\|\
	XFS_PQUOTA_CHKD)


	/*
	* 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;

	#ifdef CONFIG_XFS_QUOTA
	extern void xfs_trans_dup_dqinfo(struct xfs_trans , struct xfs_trans );
	extern void xfs_trans_free_dqinfo(struct xfs_trans *);
	extern void xfs_trans_mod_dquot_byino(struct xfs_trans , struct xfs_inode ,
	uint, long);
	extern void xfs_trans_apply_dquot_deltas(struct xfs_trans *);
	extern void xfs_trans_unreserve_and_mod_dquots(struct xfs_trans *);
	extern int xfs_trans_reserve_quota_nblks(struct xfs_trans *,
	struct xfs_inode *, long, long, uint);
	extern int xfs_trans_reserve_quota_bydquots(struct xfs_trans *,
	struct xfs_mount , struct xfs_dquot ,
	struct xfs_dquot *, long, long, uint);

	extern int xfs_qm_vop_dqalloc(struct xfs_inode *, uid_t, gid_t, prid_t, uint,
	struct xfs_dquot , struct xfs_dquot );
	extern void xfs_qm_vop_create_dqattach(struct xfs_trans , struct xfs_inode ,
	struct xfs_dquot , struct xfs_dquot );
	extern int xfs_qm_vop_rename_dqattach(struct xfs_inode **);
	extern struct xfs_dquot xfs_qm_vop_chown(struct xfs_trans ,
	struct xfs_inode , struct xfs_dquot , struct xfs_dquot );
	extern int xfs_qm_vop_chown_reserve(struct xfs_trans , struct xfs_inode ,
	struct xfs_dquot , struct xfs_dquot , uint);
	extern int xfs_qm_dqattach(struct xfs_inode *, uint);
	extern int xfs_qm_dqattach_locked(struct xfs_inode *, uint);
	extern void xfs_qm_dqdetach(struct xfs_inode *);
	extern void xfs_qm_dqrele(struct xfs_dquot *);
	extern void xfs_qm_statvfs(struct xfs_inode , struct kstatfs );
	extern int xfs_qm_newmount(struct xfs_mount , uint , uint *);
	extern void xfs_qm_mount_quotas(struct xfs_mount *);
	extern void xfs_qm_unmount(struct xfs_mount *);
	extern void xfs_qm_unmount_quotas(struct xfs_mount *);

	#else
	static inline int
	xfs_qm_vop_dqalloc(struct xfs_inode *ip, uid_t uid, gid_t gid, prid_t prid,
	uint flags, struct xfs_dquot udqp, struct xfs_dquot gdqp)
	{
	*udqp = NULL;
	*gdqp = NULL;
	return 0;
	}
	#define xfs_trans_dup_dqinfo(tp, tp2)
	#define xfs_trans_free_dqinfo(tp)
	#define xfs_trans_mod_dquot_byino(tp, ip, fields, delta)
	#define xfs_trans_apply_dquot_deltas(tp)
	#define xfs_trans_unreserve_and_mod_dquots(tp)
	static inline int xfs_trans_reserve_quota_nblks(struct xfs_trans *tp,
	struct xfs_inode *ip, long nblks, long ninos, uint flags)
	{
	return 0;
	}
	static inline int xfs_trans_reserve_quota_bydquots(struct xfs_trans *tp,
	struct xfs_mount mp, struct xfs_dquot udqp,
	struct xfs_dquot *gdqp, long nblks, long nions, uint flags)
	{
	return 0;
	}
	#define xfs_qm_vop_create_dqattach(tp, ip, u, g)
	#define xfs_qm_vop_rename_dqattach(it) (0)
	#define xfs_qm_vop_chown(tp, ip, old, new) (NULL)
	#define xfs_qm_vop_chown_reserve(tp, ip, u, g, fl) (0)
	#define xfs_qm_dqattach(ip, fl) (0)
	#define xfs_qm_dqattach_locked(ip, fl) (0)
	#define xfs_qm_dqdetach(ip)
	#define xfs_qm_dqrele(d)
	#define xfs_qm_statvfs(ip, s)
	#define xfs_qm_newmount(mp, a, b) (0)
	#define xfs_qm_mount_quotas(mp)
	#define xfs_qm_unmount(mp)
	#define xfs_qm_unmount_quotas(mp)
	#endif /* CONFIG_XFS_QUOTA */

	#define xfs_trans_unreserve_quota_nblks(tp, ip, nblks, ninos, flags) \
	xfs_trans_reserve_quota_nblks(tp, ip, -(nblks), -(ninos), flags)
	#define xfs_trans_reserve_quota(tp, mp, ud, gd, nb, ni, f) \
	xfs_trans_reserve_quota_bydquots(tp, mp, ud, gd, nb, ni, \
	f \| XFS_QMOPT_RES_REGBLKS)

	extern int xfs_qm_dqcheck(struct xfs_mount , xfs_disk_dquot_t ,
	xfs_dqid_t, uint, uint, char *);
	extern int xfs_mount_reset_sbqflags(struct xfs_mount *);

	extern const struct xfs_buf_ops xfs_dquot_buf_ops;

	#endif /* __KERNEL__ */
	#endif /* __XFS_QUOTA_H__ */