/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
 */

#ifndef _SYS_MNTFS_MNTDATA_H
#define _SYS_MNTFS_MNTDATA_H

#include <sys/vnode.h>
#include <sys/poll.h>
#include <sys/mnttab.h>
#include <sys/zone.h>

#ifdef  __cplusplus
extern "C" {
#endif

typedef struct mntelem {
        /* Metadata. */
        struct mntelem  *mnte_next;
        struct mntelem  *mnte_prev;
        timespec_t      mnte_birth;
        timespec_t      mnte_death;
        timespec_t      mnte_vfs_ctime;
        int             mnte_refcnt;
        /* Payload. */
        int             mnte_hidden;
        char            *mnte_text;
        size_t          mnte_text_size;
        struct extmnttab mnte_tab;
} mntelem_t;

typedef struct mntsnap {
        timespec_t mnts_time;           /* Time of this snapshot. */
        timespec_t mnts_last_mtime;     /* mnttab modification time. */
        mntelem_t *mnts_first;          /* First element in this snapshot. */
        mntelem_t *mnts_next;           /* Next element to use. */
        int mnts_flags;                 /* flags; see below. */
        size_t mnts_nmnts;              /* # of elements in this snapshot. */
        size_t mnts_text_size;          /* Text size for this snapshot. */
        size_t mnts_foffset;            /* File offset of last read(). */
        size_t mnts_ieoffset;           /* Offset of last read() in element. */
} mntsnap_t;

typedef struct mntnode {
        vnode_t *mnt_vnode;     /* vnode for this mntnode */
        vnode_t *mnt_mountvp;   /* vnode mounted on */
        krwlock_t mnt_contents; /* protects mnt_flags, mnt_read & mnt_ioctl */
        uint_t mnt_flags;       /* flags; see below */
        mntsnap_t mnt_read;     /* data for read() */
        mntsnap_t mnt_ioctl;    /* data for ioctl() */
} mntnode_t;

/*
 * Conversion macros.
 */
#define VTOM(vp)        ((struct mntnode *)(vp)->v_data)
#define MTOV(pnp)       ((pnp)->mnt_vnode)
#define MTOD(pnp)       ((struct mntdata *)MTOV(pnp)->v_vfsp->vfs_data)

#define MNTFS_ELEM_IS_DEAD(x)   ((x)->mnte_death.tv_sec || \
                                (x)->mnte_death.tv_nsec)
#define MNTFS_ELEM_IS_ALIVE(x)  !MNTFS_ELEM_IS_DEAD(x)

#if defined(_KERNEL)

typedef struct mntdata {
        zone_ref_t mnt_zone_ref;        /* zone for mount point */
        uint_t mnt_nopen;               /* count of vnodes open */
        size_t mnt_size;                /* size of last normal snapshot */
        size_t mnt_hidden_size;         /* size of last hidden snapshot */
        timespec_t mnt_mtime;           /* mtime at last normal snapshot */
        timespec_t mnt_hidden_mtime;    /* mtime at last hidden snapshot */
        struct mntnode mnt_node;        /* embedded mntnode */
} mntdata_t;

/*
 * Value for a mntsnap_t's mnts_flags.
 */
#define MNTS_SHOWHIDDEN 0x1     /* This snapshot contains hidden mounts. */
#define MNTS_REWIND     0x2     /* This snapshot must be refreshed. */
/*
 * Values for a mntnode_t's mnt_flags.
 */
#define MNT_SHOWHIDDEN  0x1     /* Include MS_NOMNTTAB mounts in snapshots. */

extern  struct vnodeops *mntvnodeops;
extern  void mntfs_getmntopts(struct vfs *, char **, size_t *);

#endif  /* _KERNEL */

#ifdef  __cplusplus
}
#endif

#endif  /* _SYS_MNTFS_MNTDATA_H */