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linux/fs/xfs/xfs_quota.h
Christoph Hellwig 92678554ab xfs: flatten the dquot lock ordering 
Introduce a new XFS_DQ_FREEING flag that tells lookup and mplist walks
to skip a dquot that is beeing freed, and use this avoid the trylock
on the hash and mplist locks in xfs_qm_dqreclaim_one.  Also simplify
xfs_dqpurge by moving the inodes to a dispose list after marking them
XFS_DQ_FREEING and avoid the locker ordering constraints.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Ben Myers <bpm@sgi.com>
2011-12-14 16:32:21 -06:00

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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__
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[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_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 */
/*
* 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_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_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_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;
#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 *);
#endif /* __KERNEL__ */
#endif /* __XFS_QUOTA_H__ */
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