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diff --git a/include/linux/quota.h b/include/linux/quota.h
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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/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
+enum quota_type {
+	USRQUOTA = 0,		/* element used for user quotas */
+	GRPQUOTA = 1,		/* element used for group quotas */
+	PRJQUOTA = 2,		/* element used for project quotas */
+};
+
+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 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;
+}
+
+
+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_GETINFO_MASK 0x1ffff	/* Mask for flags passed to userspace */
+#define DQF_SETINFO_MASK 0xffff		/* Mask for flags modifiable from userspace */
+#define DQF_SYS_FILE_B		16
+#define DQF_SYS_FILE (1 << DQF_SYS_FILE_B)	/* Quota file stored as system file */
+#define DQF_INFO_DIRTY_B	31
+#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 */
+	struct kqid dq_id;		/* ID this applies to (uid, gid, projid) */
+	loff_t dq_off;			/* Offset of dquot on disk */
+	unsigned long dq_flags;		/* See DQ_* */
+	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 (*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 *, struct kqid, struct fs_disk_quota *);
+	int (*set_dqblk)(struct super_block *, struct kqid, 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(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 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"},\
+	{QFMT_VFS_V1, "quota_v2"},\
+	{0, NULL}}
+
+#endif /* _QUOTA_ */