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diff --git a/include/linux/quota.h b/include/linux/quota.h
new file mode 100644
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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.
+ *
+ * Version: $Id: quota.h,v 2.0 1996/11/17 16:48:14 mvw Exp mvw $
+ */
+
+#ifndef _LINUX_QUOTA_
+#define _LINUX_QUOTA_
+
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/spinlock.h>
+
+#define __DQUOT_VERSION__       "dquot_6.5.1"
+#define __DQUOT_NUM_VERSION__   6*10000+5*100+1
+
+typedef __kernel_uid32_t qid_t; /* Type in which we store ids in memory */
+typedef __u64 qsize_t;          /* Type in which we store sizes */
+
+extern spinlock_t dq_data_lock;
+
+/* Size of blocks in which are counted size limits */
+#define QUOTABLOCK_BITS 10
+#define QUOTABLOCK_SIZE (1 << QUOTABLOCK_BITS)
+
+/* Conversion routines from and to quota blocks */
+#define qb2kb(x) ((x) << (QUOTABLOCK_BITS-10))
+#define kb2qb(x) ((x) >> (QUOTABLOCK_BITS-10))
+#define toqb(x) (((x) + QUOTABLOCK_SIZE - 1) >> QUOTABLOCK_BITS)
+
+#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 structure used for communication with userspace via quotactl
+ * Following flags are used to specify which fields are valid
+ */
+#define QIF_BLIMITS     1
+#define QIF_SPACE       2
+#define QIF_ILIMITS     4
+#define QIF_INODES      8
+#define QIF_BTIME       16
+#define QIF_ITIME       32
+#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;
+};
+
+#ifdef __KERNEL__
+
+#include <linux/dqblk_xfs.h>
+#include <linux/dqblk_v1.h>
+#include <linux/dqblk_v2.h>
+
+/* Maximal numbers of writes for quota operation (insert/delete/update)
+ * (over all formats) - info block, 4 pointer blocks, data block */
+#define DQUOT_MAX_WRITES        6
+
+/*
+ * Data for one user/group kept in memory
+ */
+struct mem_dqblk {
+        __u32 dqb_bhardlimit;   /* absolute limit on disk blks alloc */
+        __u32 dqb_bsoftlimit;   /* preferred limit on disk blks */
+        qsize_t dqb_curspace;   /* current used space */
+        __u32 dqb_ihardlimit;   /* absolute limit on allocated inodes */
+        __u32 dqb_isoftlimit;   /* preferred inode limit */
+        __u32 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;
+        struct list_head dqi_dirty_list;        /* List of dirty dquots */
+        unsigned long dqi_flags;
+        unsigned int dqi_bgrace;
+        unsigned int dqi_igrace;
+        union {
+                struct v1_mem_dqinfo v1_i;
+                struct v2_mem_dqinfo v2_i;
+        } u;
+};
+
+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);
+#define info_dirty(info) test_bit(DQF_INFO_DIRTY_B, &(info)->dqi_flags)
+#define info_any_dquot_dirty(info) (!list_empty(&(info)->dqi_dirty_list))
+#define info_any_dirty(info) (info_dirty(info) || info_any_dquot_dirty(info))
+
+#define sb_dqopt(sb) (&(sb)->s_dquot)
+#define sb_dqinfo(sb, type) (sb_dqopt(sb)->info+(type))
+
+struct dqstats {
+        int lookups;
+        int drops;
+        int reads;
+        int writes;
+        int cache_hits;
+        int allocated_dquots;
+        int free_dquots;
+        int syncs;
+};
+
+extern struct dqstats dqstats;
+
+#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_WAITFREE_B   6       /* dquot being waited (by invalidate_dquots) */
+
+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 semaphore 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 */
+};
+
+#define NODQUOT (struct dquot *)NULL
+
+#define QUOTA_OK          0
+#define NO_QUOTA          1
+
+/* 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 (*initialize) (struct inode *, int);
+        int (*drop) (struct inode *);
+        int (*alloc_space) (struct inode *, qsize_t, int);
+        int (*alloc_inode) (const struct inode *, unsigned long);
+        int (*free_space) (struct inode *, qsize_t);
+        int (*free_inode) (const struct inode *, unsigned long);
+        int (*transfer) (struct inode *, struct iattr *);
+        int (*write_dquot) (struct dquot *);            /* Ordinary dquot write */
+        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" */
+};
+
+/* 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 (*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 if_dqblk *);
+        int (*set_dqblk)(struct super_block *, int, qid_t, struct if_dqblk *);
+        int (*get_xstate)(struct super_block *, struct fs_quota_stat *);
+        int (*set_xstate)(struct super_block *, unsigned int, int);
+        int (*get_xquota)(struct super_block *, int, qid_t, struct fs_disk_quota *);
+        int (*set_xquota)(struct super_block *, int, qid_t, struct fs_disk_quota *);
+};
+
+struct quota_format_type {
+        int qf_fmt_id;  /* Quota format id */
+        struct quota_format_ops *qf_ops;        /* Operations of format */
+        struct module *qf_owner;                /* Module implementing quota format */
+        struct quota_format_type *qf_next;
+};
+
+#define DQUOT_USR_ENABLED       0x01            /* User diskquotas enabled */
+#define DQUOT_GRP_ENABLED       0x02            /* Group diskquotas enabled */
+
+struct quota_info {
+        unsigned int flags;                     /* Flags for diskquotas on this device */
+        struct semaphore dqio_sem;              /* lock device while I/O in progress */
+        struct semaphore dqonoff_sem;           /* 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 vfsmount *mnt[MAXQUOTAS];        /* mountpoint entries of filesystems with quota files */
+        struct mem_dqinfo info[MAXQUOTAS];      /* Information for each quota type */
+        struct quota_format_ops *ops[MAXQUOTAS];        /* Operations for each type */
+};
+
+/* Inline would be better but we need to dereference super_block which is not defined yet */
+int mark_dquot_dirty(struct dquot *dquot);
+
+#define dquot_dirty(dquot) test_bit(DQ_MOD_B, &(dquot)->dq_flags)
+
+#define sb_has_quota_enabled(sb, type) ((type)==USRQUOTA ? \
+        (sb_dqopt(sb)->flags & DQUOT_USR_ENABLED) : (sb_dqopt(sb)->flags & DQUOT_GRP_ENABLED))
+
+#define sb_any_quota_enabled(sb) (sb_has_quota_enabled(sb, USRQUOTA) | \
+                                  sb_has_quota_enabled(sb, GRPQUOTA))
+
+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_ */