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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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#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 PRJQUOTAenum 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_INTERFACEextern void quota_send_warning(struct kqid qid, dev_t dev, const char warntype);#elsestatic 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 */};
void 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_ */