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kernel-ark/include/linux/quota.h
Dmitry Monakhov f32764bd2b quota: Convert quota statistics to generic percpu_counter 
Generic per-cpu counter has some memory overhead but it is negligible for
modern systems and embedded systems compile without quota support.  And code
reuse is a good thing. This patch should fix complain from preemptive kernels
which was introduced by dde9588853.

[Jan Kara: Fixed patch to work on 32-bit archs as well]

Reported-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: Jan Kara <jack@suse.cz>
2010-05-27 18:56:27 +02:00

425 lines
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/*
* Copyright (c) 1982, 1986 Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Robert Elz at The University of Melbourne.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef _LINUX_QUOTA_
#define _LINUX_QUOTA_
#include <linux/errno.h>
#include <linux/types.h>
#define __DQUOT_VERSION__ "dquot_6.5.2"
#define MAXQUOTAS 2
#define USRQUOTA 0 /* element used for user quotas */
#define GRPQUOTA 1 /* element used for group quotas */
/*
* Definitions for the default names of the quotas files.
*/
#define INITQFNAMES { \
"user", /* USRQUOTA */ \
"group", /* GRPQUOTA */ \
"undefined", \
};
/*
* Command definitions for the 'quotactl' system call.
* The commands are broken into a main command defined below
* and a subcommand that is used to convey the type of
* quota that is being manipulated (see above).
*/
#define SUBCMDMASK 0x00ff
#define SUBCMDSHIFT 8
#define QCMD(cmd, type) (((cmd) << SUBCMDSHIFT) | ((type) & SUBCMDMASK))
#define Q_SYNC 0x800001 /* sync disk copy of a filesystems quotas */
#define Q_QUOTAON 0x800002 /* turn quotas on */
#define Q_QUOTAOFF 0x800003 /* turn quotas off */
#define Q_GETFMT 0x800004 /* get quota format used on given filesystem */
#define Q_GETINFO 0x800005 /* get information about quota files */
#define Q_SETINFO 0x800006 /* set information about quota files */
#define Q_GETQUOTA 0x800007 /* get user quota structure */
#define Q_SETQUOTA 0x800008 /* set user quota structure */
/* Quota format type IDs */
#define QFMT_VFS_OLD 1
#define QFMT_VFS_V0 2
#define QFMT_OCFS2 3
#define QFMT_VFS_V1 4
/* Size of block in which space limits are passed through the quota
* interface */
#define QIF_DQBLKSIZE_BITS 10
#define QIF_DQBLKSIZE (1 << QIF_DQBLKSIZE_BITS)
/*
* Quota structure used for communication with userspace via quotactl
* Following flags are used to specify which fields are valid
*/
enum {
QIF_BLIMITS_B = 0,
QIF_SPACE_B,
QIF_ILIMITS_B,
QIF_INODES_B,
QIF_BTIME_B,
QIF_ITIME_B,
};
#define QIF_BLIMITS (1 << QIF_BLIMITS_B)
#define QIF_SPACE (1 << QIF_SPACE_B)
#define QIF_ILIMITS (1 << QIF_ILIMITS_B)
#define QIF_INODES (1 << QIF_INODES_B)
#define QIF_BTIME (1 << QIF_BTIME_B)
#define QIF_ITIME (1 << QIF_ITIME_B)
#define QIF_LIMITS (QIF_BLIMITS | QIF_ILIMITS)
#define QIF_USAGE (QIF_SPACE | QIF_INODES)
#define QIF_TIMES (QIF_BTIME | QIF_ITIME)
#define QIF_ALL (QIF_LIMITS | QIF_USAGE | QIF_TIMES)
struct if_dqblk {
__u64 dqb_bhardlimit;
__u64 dqb_bsoftlimit;
__u64 dqb_curspace;
__u64 dqb_ihardlimit;
__u64 dqb_isoftlimit;
__u64 dqb_curinodes;
__u64 dqb_btime;
__u64 dqb_itime;
__u32 dqb_valid;
};
/*
* Structure used for setting quota information about file via quotactl
* Following flags are used to specify which fields are valid
*/
#define IIF_BGRACE 1
#define IIF_IGRACE 2
#define IIF_FLAGS 4
#define IIF_ALL (IIF_BGRACE | IIF_IGRACE | IIF_FLAGS)
struct if_dqinfo {
__u64 dqi_bgrace;
__u64 dqi_igrace;
__u32 dqi_flags;
__u32 dqi_valid;
};
/*
* Definitions for quota netlink interface
*/
#define QUOTA_NL_NOWARN 0
#define QUOTA_NL_IHARDWARN 1 /* Inode hardlimit reached */
#define QUOTA_NL_ISOFTLONGWARN 2 /* Inode grace time expired */
#define QUOTA_NL_ISOFTWARN 3 /* Inode softlimit reached */
#define QUOTA_NL_BHARDWARN 4 /* Block hardlimit reached */
#define QUOTA_NL_BSOFTLONGWARN 5 /* Block grace time expired */
#define QUOTA_NL_BSOFTWARN 6 /* Block softlimit reached */
#define QUOTA_NL_IHARDBELOW 7 /* Usage got below inode hardlimit */
#define QUOTA_NL_ISOFTBELOW 8 /* Usage got below inode softlimit */
#define QUOTA_NL_BHARDBELOW 9 /* Usage got below block hardlimit */
#define QUOTA_NL_BSOFTBELOW 10 /* Usage got below block softlimit */
enum {
QUOTA_NL_C_UNSPEC,
QUOTA_NL_C_WARNING,
__QUOTA_NL_C_MAX,
};
#define QUOTA_NL_C_MAX (__QUOTA_NL_C_MAX - 1)
enum {
QUOTA_NL_A_UNSPEC,
QUOTA_NL_A_QTYPE,
QUOTA_NL_A_EXCESS_ID,
QUOTA_NL_A_WARNING,
QUOTA_NL_A_DEV_MAJOR,
QUOTA_NL_A_DEV_MINOR,
QUOTA_NL_A_CAUSED_ID,
__QUOTA_NL_A_MAX,
};
#define QUOTA_NL_A_MAX (__QUOTA_NL_A_MAX - 1)
#ifdef __KERNEL__
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/rwsem.h>
#include <linux/spinlock.h>
#include <linux/wait.h>
#include <linux/percpu_counter.h>
#include <linux/dqblk_xfs.h>
#include <linux/dqblk_v1.h>
#include <linux/dqblk_v2.h>
#include <asm/atomic.h>
typedef __kernel_uid32_t qid_t; /* Type in which we store ids in memory */
typedef long long qsize_t; /* Type in which we store sizes */
extern spinlock_t dq_data_lock;
/* Maximal numbers of writes for quota operation (insert/delete/update)
* (over VFS all formats) */
#define DQUOT_INIT_ALLOC max(V1_INIT_ALLOC, V2_INIT_ALLOC)
#define DQUOT_INIT_REWRITE max(V1_INIT_REWRITE, V2_INIT_REWRITE)
#define DQUOT_DEL_ALLOC max(V1_DEL_ALLOC, V2_DEL_ALLOC)
#define DQUOT_DEL_REWRITE max(V1_DEL_REWRITE, V2_DEL_REWRITE)
/*
* Data for one user/group kept in memory
*/
struct mem_dqblk {
qsize_t dqb_bhardlimit; /* absolute limit on disk blks alloc */
qsize_t dqb_bsoftlimit; /* preferred limit on disk blks */
qsize_t dqb_curspace; /* current used space */
qsize_t dqb_rsvspace; /* current reserved space for delalloc*/
qsize_t dqb_ihardlimit; /* absolute limit on allocated inodes */
qsize_t dqb_isoftlimit; /* preferred inode limit */
qsize_t dqb_curinodes; /* current # allocated inodes */
time_t dqb_btime; /* time limit for excessive disk use */
time_t dqb_itime; /* time limit for excessive inode use */
};
/*
* Data for one quotafile kept in memory
*/
struct quota_format_type;
struct mem_dqinfo {
struct quota_format_type *dqi_format;
int dqi_fmt_id; /* Id of the dqi_format - used when turning
* quotas on after remount RW */
struct list_head dqi_dirty_list; /* List of dirty dquots */
unsigned long dqi_flags;
unsigned int dqi_bgrace;
unsigned int dqi_igrace;
qsize_t dqi_maxblimit;
qsize_t dqi_maxilimit;
void *dqi_priv;
};
struct super_block;
#define DQF_MASK 0xffff /* Mask for format specific flags */
#define DQF_INFO_DIRTY_B 16
#define DQF_INFO_DIRTY (1 << DQF_INFO_DIRTY_B) /* Is info dirty? */
extern void mark_info_dirty(struct super_block *sb, int type);
static inline int info_dirty(struct mem_dqinfo *info)
{
return test_bit(DQF_INFO_DIRTY_B, &info->dqi_flags);
}
enum {
DQST_LOOKUPS,
DQST_DROPS,
DQST_READS,
DQST_WRITES,
DQST_CACHE_HITS,
DQST_ALLOC_DQUOTS,
DQST_FREE_DQUOTS,
DQST_SYNCS,
_DQST_DQSTAT_LAST
};
struct dqstats {
int stat[_DQST_DQSTAT_LAST];
struct percpu_counter counter[_DQST_DQSTAT_LAST];
};
extern struct dqstats *dqstats_pcpu;
extern struct dqstats dqstats;
static inline void dqstats_inc(unsigned int type)
{
percpu_counter_inc(&dqstats.counter[type]);
}
static inline void dqstats_dec(unsigned int type)
{
percpu_counter_dec(&dqstats.counter[type]);
}
#define DQ_MOD_B 0 /* dquot modified since read */
#define DQ_BLKS_B 1 /* uid/gid has been warned about blk limit */
#define DQ_INODES_B 2 /* uid/gid has been warned about inode limit */
#define DQ_FAKE_B 3 /* no limits only usage */
#define DQ_READ_B 4 /* dquot was read into memory */
#define DQ_ACTIVE_B 5 /* dquot is active (dquot_release not called) */
#define DQ_LASTSET_B 6 /* Following 6 bits (see QIF_) are reserved\
* for the mask of entries set via SETQUOTA\
* quotactl. They are set under dq_data_lock\
* and the quota format handling dquot can\
* clear them when it sees fit. */
struct dquot {
struct hlist_node dq_hash; /* Hash list in memory */
struct list_head dq_inuse; /* List of all quotas */
struct list_head dq_free; /* Free list element */
struct list_head dq_dirty; /* List of dirty dquots */
struct mutex dq_lock; /* dquot IO lock */
atomic_t dq_count; /* Use count */
wait_queue_head_t dq_wait_unused; /* Wait queue for dquot to become unused */
struct super_block *dq_sb; /* superblock this applies to */
unsigned int dq_id; /* ID this applies to (uid, gid) */
loff_t dq_off; /* Offset of dquot on disk */
unsigned long dq_flags; /* See DQ_* */
short dq_type; /* Type of quota */
struct mem_dqblk dq_dqb; /* Diskquota usage */
};
/* Operations which must be implemented by each quota format */
struct quota_format_ops {
int (*check_quota_file)(struct super_block *sb, int type); /* Detect whether file is in our format */
int (*read_file_info)(struct super_block *sb, int type); /* Read main info about file - called on quotaon() */
int (*write_file_info)(struct super_block *sb, int type); /* Write main info about file */
int (*free_file_info)(struct super_block *sb, int type); /* Called on quotaoff() */
int (*read_dqblk)(struct dquot *dquot); /* Read structure for one user */
int (*commit_dqblk)(struct dquot *dquot); /* Write structure for one user */
int (*release_dqblk)(struct dquot *dquot); /* Called when last reference to dquot is being dropped */
};
/* Operations working with dquots */
struct dquot_operations {
int (*write_dquot) (struct dquot *); /* Ordinary dquot write */
struct dquot *(*alloc_dquot)(struct super_block *, int); /* Allocate memory for new dquot */
void (*destroy_dquot)(struct dquot *); /* Free memory for dquot */
int (*acquire_dquot) (struct dquot *); /* Quota is going to be created on disk */
int (*release_dquot) (struct dquot *); /* Quota is going to be deleted from disk */
int (*mark_dirty) (struct dquot *); /* Dquot is marked dirty */
int (*write_info) (struct super_block *, int); /* Write of quota "superblock" */
/* get reserved quota for delayed alloc, value returned is managed by
* quota code only */
qsize_t *(*get_reserved_space) (struct inode *);
};
/* Operations handling requests from userspace */
struct quotactl_ops {
int (*quota_on)(struct super_block *, int, int, char *);
int (*quota_off)(struct super_block *, int);
int (*quota_sync)(struct super_block *, int, int);
int (*get_info)(struct super_block *, int, struct if_dqinfo *);
int (*set_info)(struct super_block *, int, struct if_dqinfo *);
int (*get_dqblk)(struct super_block *, int, qid_t, struct fs_disk_quota *);
int (*set_dqblk)(struct super_block *, int, qid_t, struct fs_disk_quota *);
int (*get_xstate)(struct super_block *, struct fs_quota_stat *);
int (*set_xstate)(struct super_block *, unsigned int, int);
};
struct quota_format_type {
int qf_fmt_id; /* Quota format id */
const struct quota_format_ops *qf_ops; /* Operations of format */
struct module *qf_owner; /* Module implementing quota format */
struct quota_format_type *qf_next;
};
/* Quota state flags - they actually come in two flavors - for users and groups */
enum {
_DQUOT_USAGE_ENABLED = 0, /* Track disk usage for users */
_DQUOT_LIMITS_ENABLED, /* Enforce quota limits for users */
_DQUOT_SUSPENDED, /* User diskquotas are off, but
* we have necessary info in
* memory to turn them on */
_DQUOT_STATE_FLAGS
};
#define DQUOT_USAGE_ENABLED (1 << _DQUOT_USAGE_ENABLED)
#define DQUOT_LIMITS_ENABLED (1 << _DQUOT_LIMITS_ENABLED)
#define DQUOT_SUSPENDED (1 << _DQUOT_SUSPENDED)
#define DQUOT_STATE_FLAGS (DQUOT_USAGE_ENABLED | DQUOT_LIMITS_ENABLED | \
DQUOT_SUSPENDED)
/* Other quota flags */
#define DQUOT_STATE_LAST (_DQUOT_STATE_FLAGS * MAXQUOTAS)
#define DQUOT_QUOTA_SYS_FILE (1 << DQUOT_STATE_LAST)
/* Quota file is a special
* system file and user cannot
* touch it. Filesystem is
* responsible for setting
* S_NOQUOTA, S_NOATIME flags
*/
#define DQUOT_NEGATIVE_USAGE (1 << (DQUOT_STATE_LAST + 1))
/* Allow negative quota usage */
static inline unsigned int dquot_state_flag(unsigned int flags, int type)
{
return flags << _DQUOT_STATE_FLAGS * type;
}
static inline unsigned int dquot_generic_flag(unsigned int flags, int type)
{
return (flags >> _DQUOT_STATE_FLAGS * type) & DQUOT_STATE_FLAGS;
}
#ifdef CONFIG_QUOTA_NETLINK_INTERFACE
extern void quota_send_warning(short type, unsigned int id, dev_t dev,
const char warntype);
#else
static inline void quota_send_warning(short type, unsigned int id, dev_t dev,
const char warntype)
{
return;
}
#endif /* CONFIG_QUOTA_NETLINK_INTERFACE */
struct quota_info {
unsigned int flags; /* Flags for diskquotas on this device */
struct mutex dqio_mutex; /* lock device while I/O in progress */
struct mutex dqonoff_mutex; /* Serialize quotaon & quotaoff */
struct rw_semaphore dqptr_sem; /* serialize ops using quota_info struct, pointers from inode to dquots */
struct inode *files[MAXQUOTAS]; /* inodes of quotafiles */
struct mem_dqinfo info[MAXQUOTAS]; /* Information for each quota type */
const struct quota_format_ops *ops[MAXQUOTAS]; /* Operations for each type */
};
int register_quota_format(struct quota_format_type *fmt);
void unregister_quota_format(struct quota_format_type *fmt);
struct quota_module_name {
int qm_fmt_id;
char *qm_mod_name;
};
#define INIT_QUOTA_MODULE_NAMES {\
{QFMT_VFS_OLD, "quota_v1"},\
{QFMT_VFS_V0, "quota_v2"},\
{0, NULL}}
#else
# /* nodep */ include <sys/cdefs.h>
__BEGIN_DECLS
long quotactl __P ((unsigned int, const char *, int, caddr_t));
__END_DECLS
#endif /* __KERNEL__ */
#endif /* _QUOTA_ */
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