Viewing file:  quota.h (18.76 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/*
* 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/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>
#include <linux/uidgid.h>
#include <linux/projid.h>
#include <uapi/linux/quota.h>
#undef USRQUOTA
#undef GRPQUOTA
#undef PRJQUOTA
enum quota_type {
USRQUOTA = 0, /* element used for user quotas */
GRPQUOTA = 1, /* element used for group quotas */
PRJQUOTA = 2, /* element used for project quotas */
};
/* Masks for quota types when used as a bitmask */
#define QTYPE_MASK_USR (1 << USRQUOTA)
#define QTYPE_MASK_GRP (1 << GRPQUOTA)
#define QTYPE_MASK_PRJ (1 << PRJQUOTA)
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 */
struct kqid { /* Type in which we store the quota identifier */
union {
kuid_t uid;
kgid_t gid;
kprojid_t projid;
};
enum quota_type type; /* USRQUOTA (uid) or GRPQUOTA (gid) or PRJQUOTA (projid) */
};
extern bool qid_eq(struct kqid left, struct kqid right);
extern bool qid_lt(struct kqid left, struct kqid right);
extern qid_t from_kqid(struct user_namespace *to, struct kqid qid);
extern qid_t from_kqid_munged(struct user_namespace *to, struct kqid qid);
extern bool qid_valid(struct kqid qid);
/**
* make_kqid - Map a user-namespace, type, qid tuple into a kqid.
* @from: User namespace that the qid is in
* @type: The type of quota
* @qid: Quota identifier
*
* Maps a user-namespace, type qid tuple into a kernel internal
* kqid, and returns that kqid.
*
* When there is no mapping defined for the user-namespace, type,
* qid tuple an invalid kqid is returned. Callers are expected to
* test for and handle invalid kqids being returned.
* Invalid kqids may be tested for using qid_valid().
*/
static inline struct kqid make_kqid(struct user_namespace *from,
enum quota_type type, qid_t qid)
{
struct kqid kqid;
kqid.type = type;
switch (type) {
case USRQUOTA:
kqid.uid = make_kuid(from, qid);
break;
case GRPQUOTA:
kqid.gid = make_kgid(from, qid);
break;
case PRJQUOTA:
kqid.projid = make_kprojid(from, qid);
break;
default:
BUG();
}
return kqid;
}
/**
* make_kqid_invalid - Explicitly make an invalid kqid
* @type: The type of quota identifier
*
* Returns an invalid kqid with the specified type.
*/
static inline struct kqid make_kqid_invalid(enum quota_type type)
{
struct kqid kqid;
kqid.type = type;
switch (type) {
case USRQUOTA:
kqid.uid = INVALID_UID;
break;
case GRPQUOTA:
kqid.gid = INVALID_GID;
break;
case PRJQUOTA:
kqid.projid = INVALID_PROJID;
break;
default:
BUG();
}
return kqid;
}
/**
* make_kqid_uid - Make a kqid from a kuid
* @uid: The kuid to make the quota identifier from
*/
static inline struct kqid make_kqid_uid(kuid_t uid)
{
struct kqid kqid;
kqid.type = USRQUOTA;
kqid.uid = uid;
return kqid;
}
/**
* make_kqid_gid - Make a kqid from a kgid
* @gid: The kgid to make the quota identifier from
*/
static inline struct kqid make_kqid_gid(kgid_t gid)
{
struct kqid kqid;
kqid.type = GRPQUOTA;
kqid.gid = gid;
return kqid;
}
/**
* make_kqid_projid - Make a kqid from a projid
* @projid: The kprojid to make the quota identifier from
*/
static inline struct kqid make_kqid_projid(kprojid_t projid)
{
struct kqid kqid;
kqid.type = PRJQUOTA;
kqid.projid = projid;
return kqid;
}
/**
* qid_has_mapping - Report if a qid maps into a user namespace.
* @ns: The user namespace to see if a value maps into.
* @qid: The kernel internal quota identifier to test.
*/
static inline bool qid_has_mapping(struct user_namespace *ns, struct kqid qid)
{
return from_kqid(ns, qid) != (qid_t) -1;
}
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 */
time64_t dqb_btime; /* time limit for excessive disk use */
time64_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 [dq_list_lock] */
unsigned long dqi_flags; /* DFQ_ flags [dq_data_lock] */
unsigned int dqi_bgrace; /* Space grace time [dq_data_lock] */
unsigned int dqi_igrace; /* Inode grace time [dq_data_lock] */
qsize_t dqi_max_spc_limit; /* Maximum space limit [static] */
qsize_t dqi_max_ino_limit; /* Maximum inode limit [static] */
void *dqi_priv;
};
struct super_block;
/* Mask for flags passed to userspace */
#define DQF_GETINFO_MASK (DQF_ROOT_SQUASH | DQF_SYS_FILE)
/* Mask for flags modifiable from userspace */
#define DQF_SETINFO_MASK DQF_ROOT_SQUASH
enum {
DQF_INFO_DIRTY_B = DQF_PRIVATE,
};
#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 {
unsigned long stat[_DQST_DQSTAT_LAST];
struct percpu_counter counter[_DQST_DQSTAT_LAST];
};
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_RELEASING_B 6 /* dquot is in releasing_dquots list waiting
* to be cleaned up */
#define DQ_LASTSET_B 7 /* 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 [dq_list_lock] */
struct list_head dq_inuse; /* List of all quotas [dq_list_lock] */
struct list_head dq_free; /* Free list element [dq_list_lock] */
struct list_head dq_dirty; /* List of dirty dquots [dq_list_lock] */
struct mutex dq_lock; /* dquot IO lock */
spinlock_t dq_dqb_lock; /* Lock protecting dq_dqb changes */
atomic_t dq_count; /* Use count */
struct super_block *dq_sb; /* superblock this applies to */
struct kqid dq_id; /* ID this applies to (uid, gid, projid) */
loff_t dq_off; /* Offset of dquot on disk [dq_lock, stable once set] */
unsigned long dq_flags; /* See DQ_* */
struct mem_dqblk dq_dqb; /* Diskquota usage [dq_dqb_lock] */
};
/* 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 */
int (*get_next_id)(struct super_block *sb, struct kqid *qid); /* Get next ID with existing structure in the quota file */
};
/* 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 *);
int (*get_projid) (struct inode *, kprojid_t *);/* Get project ID */
/* Get number of inodes that were charged for a given inode */
int (*get_inode_usage) (struct inode *, qsize_t *);
/* Get next ID with active quota structure */
int (*get_next_id) (struct super_block *sb, struct kqid *qid);
};
struct path;
/* Structure for communicating via ->get_dqblk() & ->set_dqblk() */
struct qc_dqblk {
int d_fieldmask; /* mask of fields to change in ->set_dqblk() */
u64 d_spc_hardlimit; /* absolute limit on used space */
u64 d_spc_softlimit; /* preferred limit on used space */
u64 d_ino_hardlimit; /* maximum # allocated inodes */
u64 d_ino_softlimit; /* preferred inode limit */
u64 d_space; /* Space owned by the user */
u64 d_ino_count; /* # inodes owned by the user */
s64 d_ino_timer; /* zero if within inode limits */
/* if not, we refuse service */
s64 d_spc_timer; /* similar to above; for space */
int d_ino_warns; /* # warnings issued wrt num inodes */
int d_spc_warns; /* # warnings issued wrt used space */
u64 d_rt_spc_hardlimit; /* absolute limit on realtime space */
u64 d_rt_spc_softlimit; /* preferred limit on RT space */
u64 d_rt_space; /* realtime space owned */
s64 d_rt_spc_timer; /* similar to above; for RT space */
int d_rt_spc_warns; /* # warnings issued wrt RT space */
};
/*
* Field specifiers for ->set_dqblk() in struct qc_dqblk and also for
* ->set_info() in struct qc_info
*/
#define QC_INO_SOFT (1<<0)
#define QC_INO_HARD (1<<1)
#define QC_SPC_SOFT (1<<2)
#define QC_SPC_HARD (1<<3)
#define QC_RT_SPC_SOFT (1<<4)
#define QC_RT_SPC_HARD (1<<5)
#define QC_LIMIT_MASK (QC_INO_SOFT | QC_INO_HARD | QC_SPC_SOFT | QC_SPC_HARD | \
QC_RT_SPC_SOFT | QC_RT_SPC_HARD)
#define QC_SPC_TIMER (1<<6)
#define QC_INO_TIMER (1<<7)
#define QC_RT_SPC_TIMER (1<<8)
#define QC_TIMER_MASK (QC_SPC_TIMER | QC_INO_TIMER | QC_RT_SPC_TIMER)
#define QC_SPC_WARNS (1<<9)
#define QC_INO_WARNS (1<<10)
#define QC_RT_SPC_WARNS (1<<11)
#define QC_WARNS_MASK (QC_SPC_WARNS | QC_INO_WARNS | QC_RT_SPC_WARNS)
#define QC_SPACE (1<<12)
#define QC_INO_COUNT (1<<13)
#define QC_RT_SPACE (1<<14)
#define QC_ACCT_MASK (QC_SPACE | QC_INO_COUNT | QC_RT_SPACE)
#define QC_FLAGS (1<<15)
#define QCI_SYSFILE (1 << 0) /* Quota file is hidden from userspace */
#define QCI_ROOT_SQUASH (1 << 1) /* Root squash turned on */
#define QCI_ACCT_ENABLED (1 << 2) /* Quota accounting enabled */
#define QCI_LIMITS_ENFORCED (1 << 3) /* Quota limits enforced */
/* Structures for communicating via ->get_state */
struct qc_type_state {
unsigned int flags; /* Flags QCI_* */
unsigned int spc_timelimit; /* Time after which space softlimit is
* enforced */
unsigned int ino_timelimit; /* Ditto for inode softlimit */
unsigned int rt_spc_timelimit; /* Ditto for real-time space */
unsigned int spc_warnlimit; /* Limit for number of space warnings */
unsigned int ino_warnlimit; /* Ditto for inodes */
unsigned int rt_spc_warnlimit; /* Ditto for real-time space */
unsigned long long ino; /* Inode number of quota file */
blkcnt_t blocks; /* Number of 512-byte blocks in the file */
blkcnt_t nextents; /* Number of extents in the file */
};
struct qc_state {
unsigned int s_incoredqs; /* Number of dquots in core */
struct qc_type_state s_state[MAXQUOTAS]; /* Per quota type information */
};
/* Structure for communicating via ->set_info */
struct qc_info {
int i_fieldmask; /* mask of fields to change in ->set_info() */
unsigned int i_flags; /* Flags QCI_* */
unsigned int i_spc_timelimit; /* Time after which space softlimit is
* enforced */
unsigned int i_ino_timelimit; /* Ditto for inode softlimit */
unsigned int i_rt_spc_timelimit;/* Ditto for real-time space */
unsigned int i_spc_warnlimit; /* Limit for number of space warnings */
unsigned int i_ino_warnlimit; /* Limit for number of inode warnings */
unsigned int i_rt_spc_warnlimit; /* Ditto for real-time space */
};
/* Operations handling requests from userspace */
struct quotactl_ops {
int (*quota_on)(struct super_block *, int, int, const struct path *);
int (*quota_off)(struct super_block *, int);
int (*quota_enable)(struct super_block *, unsigned int);
int (*quota_disable)(struct super_block *, unsigned int);
int (*quota_sync)(struct super_block *, int);
int (*set_info)(struct super_block *, int, struct qc_info *);
int (*get_dqblk)(struct super_block *, struct kqid, struct qc_dqblk *);
int (*get_nextdqblk)(struct super_block *, struct kqid *,
struct qc_dqblk *);
int (*set_dqblk)(struct super_block *, struct kqid, struct qc_dqblk *);
int (*get_state)(struct super_block *, struct qc_state *);
int (*rm_xquota)(struct super_block *, unsigned 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 come in three flavors - for users, groups and projects.
*
* Actual typed flags layout:
* USRQUOTA GRPQUOTA PRJQUOTA
* DQUOT_USAGE_ENABLED 0x0001 0x0002 0x0004
* DQUOT_LIMITS_ENABLED 0x0008 0x0010 0x0020
* DQUOT_SUSPENDED 0x0040 0x0080 0x0100
*
* Following bits are used for non-typed flags:
* DQUOT_QUOTA_SYS_FILE 0x0200
* DQUOT_NEGATIVE_USAGE 0x0400
* DQUOT_NOLIST_DIRTY 0x0800
*/
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 * MAXQUOTAS)
#define DQUOT_LIMITS_ENABLED (1 << _DQUOT_LIMITS_ENABLED * MAXQUOTAS)
#define DQUOT_SUSPENDED (1 << _DQUOT_SUSPENDED * MAXQUOTAS)
#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 */
/* Do not track dirty dquots in a list */
#define DQUOT_NOLIST_DIRTY (1 << (DQUOT_STATE_LAST + 2))
static inline unsigned int dquot_state_flag(unsigned int flags, int type)
{
return flags << type;
}
static inline unsigned int dquot_generic_flag(unsigned int flags, int type)
{
return (flags >> type) & DQUOT_STATE_FLAGS;
}
/* Bitmap of quota types where flag is set in flags */
static __always_inline unsigned dquot_state_types(unsigned flags, unsigned flag)
{
BUILD_BUG_ON_NOT_POWER_OF_2(flag);
return (flags / flag) & ((1 << MAXQUOTAS) - 1);
}
#ifdef CONFIG_QUOTA_NETLINK_INTERFACE
extern void quota_send_warning(struct kqid qid, dev_t dev,
const char warntype);
#else
static inline void quota_send_warning(struct kqid qid, 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 rw_semaphore dqio_sem; /* Lock quota file while I/O in progress */
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"},\
{QFMT_VFS_V1, "quota_v2"},\
{0, NULL}}
#endif /* _QUOTA_ */
|