420 строки
14 KiB
C
420 строки
14 KiB
C
/*
|
|
* 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 <linux/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 *);
|
|
};
|
|
|
|
struct path;
|
|
|
|
/* Operations handling requests from userspace */
|
|
struct quotactl_ops {
|
|
int (*quota_on)(struct super_block *, int, int, struct path *);
|
|
int (*quota_on_meta)(struct super_block *, int, int);
|
|
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}}
|
|
|
|
#endif /* __KERNEL__ */
|
|
#endif /* _QUOTA_ */
|