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root/fs/xfs/xfs_quota.h

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/*
 * 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__

/*
 * 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[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 */
#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 */

#define XFS_DQ_ALLTYPES         (XFS_DQ_USER|XFS_DQ_PROJ|XFS_DQ_GROUP)

/*
 * 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 */

/*
 * 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_OQUOTA_ENFD)
#define XFS_ALL_QUOTA_CHKD      (XFS_UQUOTA_CHKD | XFS_OQUOTA_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_OQUOTA_ENFORCED(mp)      ((mp)->m_qflags & XFS_OQUOTA_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       0x0100  /* uquotas are being turned off */
#define XFS_PQUOTA_ACTIVE       0x0200  /* pquotas are being turned off */
#define XFS_GQUOTA_ACTIVE       0x0400  /* 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 | \
                                                   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_DQLOCK        0x0000001 /* dqlock */
#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_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 needed */
#define XFS_QMOPT_ILOCKED       0x0000800 /* inode is already locked (excl) */
#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 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_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_OQUOTA_CHKD) == 0 || \
                 (mp->m_sb.sb_qflags & XFS_PQUOTA_ACCT))) || \
         (XFS_IS_PQUOTA_ON(mp) && \
                ((mp->m_sb.sb_qflags & XFS_OQUOTA_CHKD) == 0 || \
                 (mp->m_sb.sb_qflags & XFS_GQUOTA_ACCT))))

#define XFS_MOUNT_QUOTA_SET1    (XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD|\
                                 XFS_UQUOTA_CHKD|XFS_PQUOTA_ACCT|\
                                 XFS_OQUOTA_ENFD|XFS_OQUOTA_CHKD)

#define XFS_MOUNT_QUOTA_SET2    (XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD|\
                                 XFS_UQUOTA_CHKD|XFS_GQUOTA_ACCT|\
                                 XFS_OQUOTA_ENFD|XFS_OQUOTA_CHKD)

#define XFS_MOUNT_QUOTA_ALL     (XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD|\
                                 XFS_UQUOTA_CHKD|XFS_PQUOTA_ACCT|\
                                 XFS_OQUOTA_ENFD|XFS_OQUOTA_CHKD|\
                                 XFS_GQUOTA_ACCT)


/*
 * 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_DQTRXOP_VOID(mp, tp, op, args...) \
                ((mp)->m_qm_ops->xfs_dqtrxops ? \
                ((mp)->m_qm_ops->xfs_dqtrxops->op)(tp, ## args) : (void)0)

#define XFS_TRANS_DUP_DQINFO(mp, otp, ntp) \
        XFS_DQTRXOP_VOID(mp, otp, qo_dup_dqinfo, ntp)
#define XFS_TRANS_FREE_DQINFO(mp, tp) \
        XFS_DQTRXOP_VOID(mp, tp, qo_free_dqinfo)
#define XFS_TRANS_MOD_DQUOT_BYINO(mp, tp, ip, field, delta) \
        XFS_DQTRXOP_VOID(mp, tp, qo_mod_dquot_byino, ip, field, delta)
#define XFS_TRANS_APPLY_DQUOT_DELTAS(mp, tp) \
        XFS_DQTRXOP_VOID(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_VOID(mp, tp, qo_unreserve_and_mod_dquots)

#define XFS_TRANS_UNRESERVE_QUOTA_NBLKS(mp, tp, ip, nblks, ninos, flags) \
        XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, tp, ip, -(nblks), -(ninos), flags)
#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 int xfs_mount_reset_sbqflags(struct xfs_mount *);

extern struct xfs_qmops xfs_qmcore_xfs;

#endif  /* __KERNEL__ */

#endif  /* __XFS_QUOTA_H__ */

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