/*
 * 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) 1988, 2010, Oracle and/or its affiliates. All rights reserved.
 * Copyright (c) 2018, Joyent, Inc.
 * Copyright (c) 2011, 2017 by Delphix. All rights reserved.
 * Copyright 2016-2024 RackTop Systems, Inc.
 */

/*      Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T     */
/*        All Rights Reserved   */

/*
 * University Copyright- Copyright (c) 1982, 1986, 1988
 * The Regents of the University of California
 * All Rights Reserved
 *
 * University Acknowledgment- Portions of this document are derived from
 * software developed by the University of California, Berkeley, and its
 * contributors.
 */

#ifndef _SYS_VNODE_H
#define _SYS_VNODE_H

#include <sys/types.h>
#include <sys/t_lock.h>
#include <sys/rwstlock.h>
#include <sys/time_impl.h>
#include <sys/cred.h>
#include <sys/uio.h>
#include <sys/resource.h>
#include <vm/seg_enum.h>
#include <sys/kstat.h>
#include <sys/kmem.h>
#include <sys/list.h>
#if defined(_KERNEL) || defined(_FAKE_KERNEL)
#include <sys/buf.h>
#include <sys/sdt.h>
#endif  /* _KERNEL || _FAKE_KERNEL */

#ifdef  __cplusplus
extern "C" {
#endif

/*
 * Statistics for all vnode operations.
 * All operations record number of ops (since boot/mount/zero'ed).
 * Certain I/O operations (read, write, readdir) also record number
 * of bytes transferred.
 * This appears in two places in the system: one is embedded in each
 * vfs_t.  There is also an array of vopstats_t structures allocated
 * on a per-fstype basis.
 */

#define VOPSTATS_STR    "vopstats_"     /* Initial string for vopstat kstats */

typedef struct vopstats {
        kstat_named_t   nopen;          /* VOP_OPEN */
        kstat_named_t   nclose;         /* VOP_CLOSE */
        kstat_named_t   nread;          /* VOP_READ */
        kstat_named_t   read_bytes;
        kstat_named_t   nwrite;         /* VOP_WRITE */
        kstat_named_t   write_bytes;
        kstat_named_t   nioctl;         /* VOP_IOCTL */
        kstat_named_t   nsetfl;         /* VOP_SETFL */
        kstat_named_t   ngetattr;       /* VOP_GETATTR */
        kstat_named_t   nsetattr;       /* VOP_SETATTR */
        kstat_named_t   naccess;        /* VOP_ACCESS */
        kstat_named_t   nlookup;        /* VOP_LOOKUP */
        kstat_named_t   ncreate;        /* VOP_CREATE */
        kstat_named_t   nremove;        /* VOP_REMOVE */
        kstat_named_t   nlink;          /* VOP_LINK */
        kstat_named_t   nrename;        /* VOP_RENAME */
        kstat_named_t   nmkdir;         /* VOP_MKDIR */
        kstat_named_t   nrmdir;         /* VOP_RMDIR */
        kstat_named_t   nreaddir;       /* VOP_READDIR */
        kstat_named_t   readdir_bytes;
        kstat_named_t   nsymlink;       /* VOP_SYMLINK */
        kstat_named_t   nreadlink;      /* VOP_READLINK */
        kstat_named_t   nfsync;         /* VOP_FSYNC */
        kstat_named_t   ninactive;      /* VOP_INACTIVE */
        kstat_named_t   nfid;           /* VOP_FID */
        kstat_named_t   nrwlock;        /* VOP_RWLOCK */
        kstat_named_t   nrwunlock;      /* VOP_RWUNLOCK */
        kstat_named_t   nseek;          /* VOP_SEEK */
        kstat_named_t   ncmp;           /* VOP_CMP */
        kstat_named_t   nfrlock;        /* VOP_FRLOCK */
        kstat_named_t   nspace;         /* VOP_SPACE */
        kstat_named_t   nrealvp;        /* VOP_REALVP */
        kstat_named_t   ngetpage;       /* VOP_GETPAGE */
        kstat_named_t   nputpage;       /* VOP_PUTPAGE */
        kstat_named_t   nmap;           /* VOP_MAP */
        kstat_named_t   naddmap;        /* VOP_ADDMAP */
        kstat_named_t   ndelmap;        /* VOP_DELMAP */
        kstat_named_t   npoll;          /* VOP_POLL */
        kstat_named_t   ndump;          /* VOP_DUMP */
        kstat_named_t   npathconf;      /* VOP_PATHCONF */
        kstat_named_t   npageio;        /* VOP_PAGEIO */
        kstat_named_t   ndumpctl;       /* VOP_DUMPCTL */
        kstat_named_t   ndispose;       /* VOP_DISPOSE */
        kstat_named_t   nsetsecattr;    /* VOP_SETSECATTR */
        kstat_named_t   ngetsecattr;    /* VOP_GETSECATTR */
        kstat_named_t   nshrlock;       /* VOP_SHRLOCK */
        kstat_named_t   nvnevent;       /* VOP_VNEVENT */
        kstat_named_t   nreqzcbuf;      /* VOP_REQZCBUF */
        kstat_named_t   nretzcbuf;      /* VOP_RETZCBUF */
} vopstats_t;

/*
 * The vnode is the focus of all file activity in UNIX.
 * A vnode is allocated for each active file, each current
 * directory, each mounted-on file, and the root.
 *
 * Each vnode is usually associated with a file-system-specific node (for
 * UFS, this is the in-memory inode).  Generally, a vnode and an fs-node
 * should be created and destroyed together as a pair.
 *
 * If a vnode is reused for a new file, it should be reinitialized by calling
 * either vn_reinit() or vn_recycle().
 *
 * vn_reinit() resets the entire vnode as if it was returned by vn_alloc().
 * The caller is responsible for setting up the entire vnode after calling
 * vn_reinit().  This is important when using kmem caching where the vnode is
 * allocated by a constructor, for instance.
 *
 * vn_recycle() is used when the file system keeps some state around in both
 * the vnode and the associated FS-node.  In UFS, for example, the inode of
 * a deleted file can be reused immediately.  The v_data, v_vfsp, v_op, etc.
 * remains the same but certain fields related to the previous instance need
 * to be reset.  In particular:
 *      v_femhead
 *      v_path
 *      v_rdcnt, v_wrcnt
 *      v_mmap_read, v_mmap_write
 */

/*
 * vnode types.  VNON means no type.  These values are unrelated to
 * values in on-disk inodes.
 */
typedef enum vtype {
        VNON    = 0,
        VREG    = 1,
        VDIR    = 2,
        VBLK    = 3,
        VCHR    = 4,
        VLNK    = 5,
        VFIFO   = 6,
        VDOOR   = 7,
        VPROC   = 8,
        VSOCK   = 9,
        VPORT   = 10,
        VBAD    = 11
} vtype_t;

/*
 * VSD - Vnode Specific Data
 * Used to associate additional private data with a vnode.
 */
struct vsd_node {
        list_node_t vs_nodes;           /* list of all VSD nodes */
        uint_t vs_nkeys;                /* entries in value array */
        void **vs_value;                /* array of value/key */
};

/*
 * Many of the fields in the vnode are read-only once they are initialized
 * at vnode creation time.  Other fields are protected by locks.
 *
 * IMPORTANT: vnodes should be created ONLY by calls to vn_alloc().  They
 * may not be embedded into the file-system specific node (inode).  The
 * size of vnodes may change.
 *
 * The v_lock protects:
 *   v_flag
 *   v_stream
 *   v_count
 *   v_shrlocks
 *   v_path
 *   v_vsd
 *   v_xattrdir
 *
 * A special lock (implemented by vn_vfswlock in vnode.c) protects:
 *   v_vfsmountedhere
 *
 * The global flock_lock mutex (in flock.c) protects:
 *   v_filocks
 *
 * IMPORTANT NOTE:
 *
 *   The following vnode fields are considered public and may safely be
 *   accessed by file systems or other consumers:
 *
 *     v_lock
 *     v_flag
 *     v_count
 *     v_data
 *     v_vfsp
 *     v_stream
 *     v_type
 *     v_rdev
 *
 * ALL OTHER FIELDS SHOULD BE ACCESSED ONLY BY THE OWNER OF THAT FIELD.
 * In particular, file systems should not access other fields; they may
 * change or even be removed.  The functionality which was once provided
 * by these fields is available through vn_* functions.
 *
 * VNODE PATH THEORY:
 * In each vnode, the v_path field holds a cached version of the canonical
 * filesystem path which that node represents.  Because vnodes lack contextual
 * information about their own name or position in the VFS hierarchy, this path
 * must be calculated when the vnode is instantiated by operations such as
 * fop_create, fop_lookup, or fop_mkdir.  During said operations, both the
 * parent vnode (and its cached v_path) and future name are known, so the
 * v_path of the resulting object can easily be set.
 *
 * The caching nature of v_path is complicated in the face of directory
 * renames.  Filesystem drivers are responsible for calling vn_renamepath when
 * a fop_rename operation succeeds.  While the v_path on the renamed vnode will
 * be updated, existing children of the directory (direct, or at deeper levels)
 * will now possess v_path caches which are stale.
 *
 * It is expensive (and for non-directories, impossible) to recalculate stale
 * v_path entries during operations such as vnodetopath.  The best time during
 * which to correct such wrongs is the same as when v_path is first
 * initialized: during fop_create/fop_lookup/fop_mkdir/etc, where adequate
 * context is available to generate the current path.
 *
 * In order to quickly detect stale v_path entries (without full lookup
 * verification) to trigger a v_path update, the v_path_stamp field has been
 * added to vnode_t.  As part of successful fop_create/fop_lookup/fop_mkdir
 * operations, where the name and parent vnode are available, the following
 * rules are used to determine updates to the child:
 *
 * 1. If the parent lacks a v_path, clear any existing v_path and v_path_stamp
 *    on the child.  Until the parent v_path is refreshed to a valid state, the
 *    child v_path must be considered invalid too.
 *
 * 2. If the child lacks a v_path (implying v_path_stamp == 0), it inherits the
 *    v_path_stamp value from its parent and its v_path is updated.
 *
 * 3. If the child v_path_stamp is less than v_path_stamp in the parent, it is
 *    an indication that the child v_path is stale.  The v_path is updated and
 *    v_path_stamp in the child is set to the current hrtime().
 *
 *    It does _not_ inherit the parent v_path_stamp in order to propagate the
 *    the time of v_path invalidation through the directory structure.  This
 *    prevents concurrent invalidations (operating with a now-incorrect v_path)
 *    at deeper levels in the tree from persisting.
 *
 * 4. If the child v_path_stamp is greater or equal to the parent, no action
 *    needs to be taken.
 *
 * Note that fop_rename operations do not follow this ruleset.  They perform an
 * explicit update of v_path and v_path_stamp (setting it to the current time)
 *
 * With these constraints in place, v_path invalidations and updates should
 * proceed in a timely manner as vnodes are accessed.  While there still are
 * limited cases where vnodetopath operations will fail, the risk is minimized.
 */

struct fem_head;        /* from fem.h */

typedef struct vnode {
        kmutex_t        v_lock;         /* protects vnode fields */
        uint_t          v_flag;         /* vnode flags (see below) */
        uint_t          v_count;        /* reference count */
        void            *v_data;        /* private data for fs */
        struct vfs      *v_vfsp;        /* ptr to containing VFS */
        struct stdata   *v_stream;      /* associated stream */
        enum vtype      v_type;         /* vnode type */
        dev_t           v_rdev;         /* device (VCHR, VBLK) */

        /* PRIVATE FIELDS BELOW - DO NOT USE */

        struct vfs      *v_vfsmountedhere; /* ptr to vfs mounted here */
        struct vnodeops *v_op;          /* vnode operations */
        struct page     *v_pages;       /* vnode pages list */
        struct filock   *v_filocks;     /* ptr to filock list */
        struct shrlocklist *v_shrlocks; /* ptr to shrlock list */
        krwlock_t       v_nbllock;      /* sync for NBMAND locks */
        kcondvar_t      v_cv;           /* synchronize locking */
        void            *v_locality;    /* hook for locality info */
        struct fem_head *v_femhead;     /* fs monitoring */
        char            *v_path;        /* cached path */
        hrtime_t        v_path_stamp;   /* timestamp for cached path */
        uint_t          v_rdcnt;        /* open for read count  (VREG only) */
        uint_t          v_wrcnt;        /* open for write count (VREG only) */
        u_longlong_t    v_mmap_read;    /* mmap read count */
        u_longlong_t    v_mmap_write;   /* mmap write count */
        void            *v_mpssdata;    /* info for large page mappings */
        void            *v_fopdata;     /* list of file ops event watches */
        kmutex_t        v_vsd_lock;     /* protects v_vsd field */
        struct vsd_node *v_vsd;         /* vnode specific data */
        struct vnode    *v_xattrdir;    /* unnamed extended attr dir (GFS) */
        uint_t          v_count_dnlc;   /* dnlc reference count */
} vnode_t;

#define IS_DEVVP(vp)    \
        ((vp)->v_type == VCHR || (vp)->v_type == VBLK || (vp)->v_type == VFIFO)

#define VNODE_ALIGN     64
/* Count of low-order 0 bits in a vnode *, based on size and alignment. */
#if defined(_LP64)
#define VNODE_ALIGN_LOG2        8
#else
#define VNODE_ALIGN_LOG2        7
#endif

/*
 * vnode flags.
 */
#define VROOT           0x01    /* root of its file system */
#define VNOCACHE        0x02    /* don't keep cache pages on vnode */
#define VNOMAP          0x04    /* file cannot be mapped/faulted */
#define VDUP            0x08    /* file should be dup'ed rather then opened */
#define VNOSWAP         0x10    /* file cannot be used as virtual swap device */
#define VNOMOUNT        0x20    /* file cannot be covered by mount */
#define VISSWAP         0x40    /* vnode is being used for swap */
#define VSWAPLIKE       0x80    /* vnode acts like swap (but may not be) */

#define IS_SWAPVP(vp)   (((vp)->v_flag & (VISSWAP | VSWAPLIKE)) != 0)

#ifdef _KERNEL
typedef struct vn_vfslocks_entry {
        rwstlock_t ve_lock;
        void *ve_vpvfs;
        struct vn_vfslocks_entry *ve_next;
        uint32_t ve_refcnt;
        char pad[64 - sizeof (rwstlock_t) - 2 * sizeof (void *) - \
            sizeof (uint32_t)];
} vn_vfslocks_entry_t;
#endif

/*
 * The following two flags are used to lock the v_vfsmountedhere field
 */
#define VVFSLOCK        0x100
#define VVFSWAIT        0x200

/*
 * Used to serialize VM operations on a vnode
 */
#define VVMLOCK         0x400

/*
 * Tell vn_open() not to fail a directory open for writing but
 * to go ahead and call VOP_OPEN() to let the filesystem check.
 */
#define VDIROPEN        0x800

/*
 * Flag to let the VM system know that this file is most likely a binary
 * or shared library since it has been mmap()ed EXEC at some time.
 */
#define VVMEXEC         0x1000

#define VPXFS           0x2000  /* clustering: global fs proxy vnode */

#define IS_PXFSVP(vp)   ((vp)->v_flag & VPXFS)

#define V_XATTRDIR      0x4000  /* attribute unnamed directory */

#define IS_XATTRDIR(vp) ((vp)->v_flag & V_XATTRDIR)

#define V_LOCALITY      0x8000  /* whether locality aware */

/*
 * Flag that indicates the VM should maintain the v_pages list with all modified
 * pages on one end and unmodified pages at the other. This makes finding dirty
 * pages to write back to disk much faster at the expense of taking a minor
 * fault on the first store instruction which touches a writable page.
 */
#define VMODSORT        (0x10000)
#define IS_VMODSORT(vp) \
        (pvn_vmodsort_supported != 0 && ((vp)->v_flag  & VMODSORT) != 0)

#define VISSWAPFS       0x20000 /* vnode is being used for swapfs */

/*
 * The mdb memstat command assumes that IS_SWAPFSVP only uses the
 * vnode's v_flag field.  If this changes, cache the additional
 * fields in mdb; see vn_get in mdb/common/modules/genunix/memory.c
 */
#define IS_SWAPFSVP(vp) (((vp)->v_flag & VISSWAPFS) != 0)

#define V_SYSATTR       0x40000 /* vnode is a GFS system attribute */

/*
 * Indication that VOP_LOOKUP operations on this vnode may yield results from a
 * different VFS instance.  The main use of this is to suppress v_path
 * calculation logic when filesystems such as procfs emit results which defy
 * expectations about normal VFS behavior.
 */
#define VTRAVERSE       0x80000

/*
 * Vnode attributes.  A bit-mask is supplied as part of the
 * structure to indicate the attributes the caller wants to
 * set (setattr) or extract (getattr).
 */

/*
 * Note that va_nodeid and va_nblocks are 64bit data type.
 * We support large files over NFSV3. With Solaris client and
 * Server that generates 64bit ino's and sizes these fields
 * will overflow if they are 32 bit sizes.
 */

typedef struct vattr {
        uint_t          va_mask;        /* bit-mask of attributes */
        vtype_t         va_type;        /* vnode type (for create) */
        mode_t          va_mode;        /* file access mode */
        uid_t           va_uid;         /* owner user id */
        gid_t           va_gid;         /* owner group id */
        dev_t           va_fsid;        /* file system id (dev for now) */
        u_longlong_t    va_nodeid;      /* node id */
        nlink_t         va_nlink;       /* number of references to file */
        u_offset_t      va_size;        /* file size in bytes */
        timestruc_t     va_atime;       /* time of last access */
        timestruc_t     va_mtime;       /* time of last modification */
        timestruc_t     va_ctime;       /* time of last status change */
        dev_t           va_rdev;        /* device the file represents */
        uint_t          va_blksize;     /* fundamental block size */
        u_longlong_t    va_nblocks;     /* # of blocks allocated */
        uint_t          va_seq;         /* sequence number */
} vattr_t;

#define AV_SCANSTAMP_SZ 32              /* length of anti-virus scanstamp */

/*
 * Structure of all optional attributes.
 */
typedef struct xoptattr {
        timestruc_t     xoa_createtime; /* Create time of file */
        uint8_t         xoa_archive;
        uint8_t         xoa_system;
        uint8_t         xoa_readonly;
        uint8_t         xoa_hidden;
        uint8_t         xoa_nounlink;
        uint8_t         xoa_immutable;
        uint8_t         xoa_appendonly;
        uint8_t         xoa_nodump;
        uint8_t         xoa_opaque;
        uint8_t         xoa_av_quarantined;
        uint8_t         xoa_av_modified;
        uint8_t         xoa_av_scanstamp[AV_SCANSTAMP_SZ];
        uint8_t         xoa_reparse;
        uint64_t        xoa_generation;
        uint8_t         xoa_offline;
        uint8_t         xoa_sparse;
        uint8_t         xoa_projinherit;
        uint64_t        xoa_projid;
} xoptattr_t;

/*
 * The xvattr structure is really a variable length structure that
 * is made up of:
 * - The classic vattr_t (xva_vattr)
 * - a 32 bit quantity (xva_mapsize) that specifies the size of the
 *   attribute bitmaps in 32 bit words.
 * - A pointer to the returned attribute bitmap (needed because the
 *   previous element, the requested attribute bitmap) is variable lenth.
 * - The requested attribute bitmap, which is an array of 32 bit words.
 *   Callers use the XVA_SET_REQ() macro to set the bits corresponding to
 *   the attributes that are being requested.
 * - The returned attribute bitmap, which is an array of 32 bit words.
 *   File systems that support optional attributes use the XVA_SET_RTN()
 *   macro to set the bits corresponding to the attributes that are being
 *   returned.
 * - The xoptattr_t structure which contains the attribute values
 *
 * xva_mapsize determines how many words in the attribute bitmaps.
 * Immediately following the attribute bitmaps is the xoptattr_t.
 * xva_getxoptattr() is used to get the pointer to the xoptattr_t
 * section.
 */

#define XVA_MAPSIZE     3               /* Size of attr bitmaps */
#define XVA_MAGIC       0x78766174      /* Magic # for verification */

/*
 * The xvattr structure is an extensible structure which permits optional
 * attributes to be requested/returned.  File systems may or may not support
 * optional attributes.  They do so at their own discretion but if they do
 * support optional attributes, they must register the VFSFT_XVATTR feature
 * so that the optional attributes can be set/retrived.
 *
 * The fields of the xvattr structure are:
 *
 * xva_vattr - The first element of an xvattr is a legacy vattr structure
 * which includes the common attributes.  If AT_XVATTR is set in the va_mask
 * then the entire structure is treated as an xvattr.  If AT_XVATTR is not
 * set, then only the xva_vattr structure can be used.
 *
 * xva_magic - 0x78766174 (hex for "xvat"). Magic number for verification.
 *
 * xva_mapsize - Size of requested and returned attribute bitmaps.
 *
 * xva_rtnattrmapp - Pointer to xva_rtnattrmap[].  We need this since the
 * size of the array before it, xva_reqattrmap[], could change which means
 * the location of xva_rtnattrmap[] could change.  This will allow unbundled
 * file systems to find the location of xva_rtnattrmap[] when the sizes change.
 *
 * xva_reqattrmap[] - Array of requested attributes.  Attributes are
 * represented by a specific bit in a specific element of the attribute
 * map array.  Callers set the bits corresponding to the attributes
 * that the caller wants to get/set.
 *
 * xva_rtnattrmap[] - Array of attributes that the file system was able to
 * process.  Not all file systems support all optional attributes.  This map
 * informs the caller which attributes the underlying file system was able
 * to set/get.  (Same structure as the requested attributes array in terms
 * of each attribute  corresponding to specific bits and array elements.)
 *
 * xva_xoptattrs - Structure containing values of optional attributes.
 * These values are only valid if the corresponding bits in xva_reqattrmap
 * are set and the underlying file system supports those attributes.
 */
typedef struct xvattr {
        vattr_t         xva_vattr;      /* Embedded vattr structure */
        uint32_t        xva_magic;      /* Magic Number */
        uint32_t        xva_mapsize;    /* Size of attr bitmap (32-bit words) */
        uint32_t        *xva_rtnattrmapp;       /* Ptr to xva_rtnattrmap[] */
        uint32_t        xva_reqattrmap[XVA_MAPSIZE];    /* Requested attrs */
        uint32_t        xva_rtnattrmap[XVA_MAPSIZE];    /* Returned attrs */
        xoptattr_t      xva_xoptattrs;  /* Optional attributes */
} xvattr_t;

#ifdef _SYSCALL32
/*
 * For bigtypes time_t changed to 64 bit on the 64-bit kernel.
 * Define an old version for user/kernel interface
 */

#if _LONG_LONG_ALIGNMENT == 8 && _LONG_LONG_ALIGNMENT_32 == 4
#pragma pack(4)
#endif

typedef struct vattr32 {
        uint32_t        va_mask;        /* bit-mask of attributes */
        vtype_t         va_type;        /* vnode type (for create) */
        mode32_t        va_mode;        /* file access mode */
        uid32_t         va_uid;         /* owner user id */
        gid32_t         va_gid;         /* owner group id */
        dev32_t         va_fsid;        /* file system id (dev for now) */
        u_longlong_t    va_nodeid;      /* node id */
        nlink_t         va_nlink;       /* number of references to file */
        u_offset_t      va_size;        /* file size in bytes */
        timestruc32_t   va_atime;       /* time of last access */
        timestruc32_t   va_mtime;       /* time of last modification */
        timestruc32_t   va_ctime;       /* time of last status change */
        dev32_t         va_rdev;        /* device the file represents */
        uint32_t        va_blksize;     /* fundamental block size */
        u_longlong_t    va_nblocks;     /* # of blocks allocated */
        uint32_t        va_seq;         /* sequence number */
} vattr32_t;

#if _LONG_LONG_ALIGNMENT == 8 && _LONG_LONG_ALIGNMENT_32 == 4
#pragma pack()
#endif

#else  /* not _SYSCALL32 */
#define vattr32         vattr
typedef vattr_t         vattr32_t;
#endif /* _SYSCALL32 */

/*
 * Attributes of interest to the caller of setattr or getattr.
 */
#define AT_TYPE         0x00001
#define AT_MODE         0x00002
#define AT_UID          0x00004
#define AT_GID          0x00008
#define AT_FSID         0x00010
#define AT_NODEID       0x00020
#define AT_NLINK        0x00040
#define AT_SIZE         0x00080
#define AT_ATIME        0x00100
#define AT_MTIME        0x00200
#define AT_CTIME        0x00400
#define AT_RDEV         0x00800
#define AT_BLKSIZE      0x01000
#define AT_NBLOCKS      0x02000
/*                      0x04000 */      /* unused */
#define AT_SEQ          0x08000
/*
 * If AT_XVATTR is set then there are additional bits to process in
 * the xvattr_t's attribute bitmap.  If this is not set then the bitmap
 * MUST be ignored.  Note that this bit must be set/cleared explicitly.
 * That is, setting AT_ALL will NOT set AT_XVATTR.
 */
#define AT_XVATTR       0x10000

#define AT_ALL          (AT_TYPE|AT_MODE|AT_UID|AT_GID|AT_FSID|AT_NODEID|\
                        AT_NLINK|AT_SIZE|AT_ATIME|AT_MTIME|AT_CTIME|\
                        AT_RDEV|AT_BLKSIZE|AT_NBLOCKS|AT_SEQ)

#define AT_STAT         (AT_MODE|AT_UID|AT_GID|AT_FSID|AT_NODEID|AT_NLINK|\
                        AT_SIZE|AT_ATIME|AT_MTIME|AT_CTIME|AT_RDEV|AT_TYPE)

#define AT_TIMES        (AT_ATIME|AT_MTIME|AT_CTIME)

#define AT_NOSET        (AT_NLINK|AT_RDEV|AT_FSID|AT_NODEID|AT_TYPE|\
                        AT_BLKSIZE|AT_NBLOCKS|AT_SEQ)

/*
 * Attribute bits used in the extensible attribute's (xva's) attribute
 * bitmaps.  Note that the bitmaps are made up of a variable length number
 * of 32-bit words.  The convention is to use XAT{n}_{attrname} where "n"
 * is the element in the bitmap (starting at 1).  This convention is for
 * the convenience of the maintainer to keep track of which element each
 * attribute belongs to.
 *
 * NOTE THAT CONSUMERS MUST *NOT* USE THE XATn_* DEFINES DIRECTLY.  CONSUMERS
 * MUST USE THE XAT_* DEFINES.
 */
#define XAT0_INDEX      0LL             /* Index into bitmap for XAT0 attrs */
#define XAT0_CREATETIME 0x00000001      /* Create time of file */
#define XAT0_ARCHIVE    0x00000002      /* Archive */
#define XAT0_SYSTEM     0x00000004      /* System */
#define XAT0_READONLY   0x00000008      /* Readonly */
#define XAT0_HIDDEN     0x00000010      /* Hidden */
#define XAT0_NOUNLINK   0x00000020      /* Nounlink */
#define XAT0_IMMUTABLE  0x00000040      /* immutable */
#define XAT0_APPENDONLY 0x00000080      /* appendonly */
#define XAT0_NODUMP     0x00000100      /* nodump */
#define XAT0_OPAQUE     0x00000200      /* opaque */
#define XAT0_AV_QUARANTINED     0x00000400      /* anti-virus quarantine */
#define XAT0_AV_MODIFIED        0x00000800      /* anti-virus modified */
#define XAT0_AV_SCANSTAMP       0x00001000      /* anti-virus scanstamp */
#define XAT0_REPARSE    0x00002000      /* FS reparse point */
#define XAT0_GEN        0x00004000      /* object generation number */
#define XAT0_OFFLINE    0x00008000      /* offline */
#define XAT0_SPARSE     0x00010000      /* sparse */
#define XAT0_PROJINHERIT        0x00020000      /* Create with parent projid */
#define XAT0_PROJID     0x00040000      /* Project ID */

#define XAT0_ALL_ATTRS  (XAT0_CREATETIME|XAT0_ARCHIVE|XAT0_SYSTEM| \
    XAT0_READONLY|XAT0_HIDDEN|XAT0_NOUNLINK|XAT0_IMMUTABLE|XAT0_APPENDONLY| \
    XAT0_NODUMP|XAT0_OPAQUE|XAT0_AV_QUARANTINED|  XAT0_AV_MODIFIED| \
    XAT0_AV_SCANSTAMP|XAT0_REPARSE|XATO_GEN|XAT0_OFFLINE|XAT0_SPARSE| \
    XAT0_PROJINHERIT | XAT0_PROJID)

/* Support for XAT_* optional attributes */
#define XVA_MASK                0xffffffff      /* Used to mask off 32 bits */
#define XVA_SHFT                32              /* Used to shift index */

/*
 * Used to pry out the index and attribute bits from the XAT_* attributes
 * defined below.  Note that we're masking things down to 32 bits then
 * casting to uint32_t.
 */
#define XVA_INDEX(attr)         ((uint32_t)(((attr) >> XVA_SHFT) & XVA_MASK))
#define XVA_ATTRBIT(attr)       ((uint32_t)((attr) & XVA_MASK))

/*
 * The following defines present a "flat namespace" so that consumers don't
 * need to keep track of which element belongs to which bitmap entry.
 *
 * NOTE THAT THESE MUST NEVER BE OR-ed TOGETHER
 */
#define XAT_CREATETIME          ((XAT0_INDEX << XVA_SHFT) | XAT0_CREATETIME)
#define XAT_ARCHIVE             ((XAT0_INDEX << XVA_SHFT) | XAT0_ARCHIVE)
#define XAT_SYSTEM              ((XAT0_INDEX << XVA_SHFT) | XAT0_SYSTEM)
#define XAT_READONLY            ((XAT0_INDEX << XVA_SHFT) | XAT0_READONLY)
#define XAT_HIDDEN              ((XAT0_INDEX << XVA_SHFT) | XAT0_HIDDEN)
#define XAT_NOUNLINK            ((XAT0_INDEX << XVA_SHFT) | XAT0_NOUNLINK)
#define XAT_IMMUTABLE           ((XAT0_INDEX << XVA_SHFT) | XAT0_IMMUTABLE)
#define XAT_APPENDONLY          ((XAT0_INDEX << XVA_SHFT) | XAT0_APPENDONLY)
#define XAT_NODUMP              ((XAT0_INDEX << XVA_SHFT) | XAT0_NODUMP)
#define XAT_OPAQUE              ((XAT0_INDEX << XVA_SHFT) | XAT0_OPAQUE)
#define XAT_AV_QUARANTINED      ((XAT0_INDEX << XVA_SHFT) | XAT0_AV_QUARANTINED)
#define XAT_AV_MODIFIED         ((XAT0_INDEX << XVA_SHFT) | XAT0_AV_MODIFIED)
#define XAT_AV_SCANSTAMP        ((XAT0_INDEX << XVA_SHFT) | XAT0_AV_SCANSTAMP)
#define XAT_REPARSE             ((XAT0_INDEX << XVA_SHFT) | XAT0_REPARSE)
#define XAT_GEN                 ((XAT0_INDEX << XVA_SHFT) | XAT0_GEN)
#define XAT_OFFLINE             ((XAT0_INDEX << XVA_SHFT) | XAT0_OFFLINE)
#define XAT_SPARSE              ((XAT0_INDEX << XVA_SHFT) | XAT0_SPARSE)
#define XAT_PROJINHERIT         ((XAT0_INDEX << XVA_SHFT) | XAT0_PROJINHERIT)
#define XAT_PROJID              ((XAT0_INDEX << XVA_SHFT) | XAT0_PROJID)

/*
 * The returned attribute map array (xva_rtnattrmap[]) is located past the
 * requested attribute map array (xva_reqattrmap[]).  Its location changes
 * when the array sizes change.  We use a separate pointer in a known location
 * (xva_rtnattrmapp) to hold the location of xva_rtnattrmap[].  This is
 * set in xva_init()
 */
#define XVA_RTNATTRMAP(xvap)    ((xvap)->xva_rtnattrmapp)

/*
 * XVA_SET_REQ() sets an attribute bit in the proper element in the bitmap
 * of requested attributes (xva_reqattrmap[]).
 */
#define XVA_SET_REQ(xvap, attr)                                 \
        ASSERT((xvap)->xva_vattr.va_mask | AT_XVATTR);          \
        ASSERT((xvap)->xva_magic == XVA_MAGIC);                 \
        (xvap)->xva_reqattrmap[XVA_INDEX(attr)] |= XVA_ATTRBIT(attr)
/*
 * XVA_CLR_REQ() clears an attribute bit in the proper element in the bitmap
 * of requested attributes (xva_reqattrmap[]).
 */
#define XVA_CLR_REQ(xvap, attr)                                 \
        ASSERT((xvap)->xva_vattr.va_mask | AT_XVATTR);          \
        ASSERT((xvap)->xva_magic == XVA_MAGIC);                 \
        (xvap)->xva_reqattrmap[XVA_INDEX(attr)] &= ~XVA_ATTRBIT(attr)

/*
 * XVA_SET_RTN() sets an attribute bit in the proper element in the bitmap
 * of returned attributes (xva_rtnattrmap[]).
 */
#define XVA_SET_RTN(xvap, attr)                                 \
        ASSERT((xvap)->xva_vattr.va_mask | AT_XVATTR);          \
        ASSERT((xvap)->xva_magic == XVA_MAGIC);                 \
        (XVA_RTNATTRMAP(xvap))[XVA_INDEX(attr)] |= XVA_ATTRBIT(attr)

/*
 * XVA_ISSET_REQ() checks the requested attribute bitmap (xva_reqattrmap[])
 * to see of the corresponding attribute bit is set.  If so, returns non-zero.
 */
#define XVA_ISSET_REQ(xvap, attr)                                       \
        ((((xvap)->xva_vattr.va_mask | AT_XVATTR) &&                    \
                ((xvap)->xva_magic == XVA_MAGIC) &&                     \
                ((xvap)->xva_mapsize > XVA_INDEX(attr))) ?              \
        ((xvap)->xva_reqattrmap[XVA_INDEX(attr)] & XVA_ATTRBIT(attr)) : 0)

/*
 * XVA_ISSET_RTN() checks the returned attribute bitmap (xva_rtnattrmap[])
 * to see of the corresponding attribute bit is set.  If so, returns non-zero.
 */
#define XVA_ISSET_RTN(xvap, attr)                                       \
        ((((xvap)->xva_vattr.va_mask | AT_XVATTR) &&                    \
                ((xvap)->xva_magic == XVA_MAGIC) &&                     \
                ((xvap)->xva_mapsize > XVA_INDEX(attr))) ?              \
        ((XVA_RTNATTRMAP(xvap))[XVA_INDEX(attr)] & XVA_ATTRBIT(attr)) : 0)

/*
 *  Modes.  Some values same as S_xxx entries from stat.h for convenience.
 */
#define VSUID           04000           /* set user id on execution */
#define VSGID           02000           /* set group id on execution */
#define VSVTX           01000           /* save swapped text even after use */

/*
 * Permissions.
 */
#define VREAD           00400
#define VWRITE          00200
#define VEXEC           00100

#define MODEMASK        07777           /* mode bits plus permission bits */
#define PERMMASK        00777           /* permission bits */

/*
 * VOP_ACCESS flags
 */
#define V_ACE_MASK      0x1     /* mask represents  NFSv4 ACE permissions */
#define V_APPEND        0x2     /* want to do append only check */

/*
 * Check whether mandatory file locking is enabled.
 */

#define MANDMODE(mode)          (((mode) & (VSGID|(VEXEC>>3))) == VSGID)
#define MANDLOCK(vp, mode)      ((vp)->v_type == VREG && MANDMODE(mode))

/*
 * Flags for vnode operations.
 */
enum rm         { RMFILE, RMDIRECTORY };        /* rm or rmdir (remove) */
enum symfollow  { NO_FOLLOW, FOLLOW };          /* follow symlinks (or not) */
enum vcexcl     { NONEXCL, EXCL };              /* (non)excl create */
enum create     { CRCREAT, CRMKNOD, CRMKDIR };  /* reason for create */

typedef enum rm         rm_t;
typedef enum symfollow  symfollow_t;
typedef enum vcexcl     vcexcl_t;
typedef enum create     create_t;

/*
 * Vnode Events - Used by VOP_VNEVENT
 * The VE_PRE_RENAME_* events fire before the rename operation and are
 * primarily used for specialized applications, such as NFSv4 delegation, which
 * need to know about rename before it occurs.
 */
typedef enum vnevent    {
        VE_SUPPORT      = 0,    /* Query */
        VE_RENAME_SRC   = 1,    /* Rename, with vnode as source */
        VE_RENAME_DEST  = 2,    /* Rename, with vnode as target/destination */
        VE_REMOVE       = 3,    /* Remove of vnode's name */
        VE_RMDIR        = 4,    /* Remove of directory vnode's name */
        VE_CREATE       = 5,    /* Create with vnode's name which exists */
        VE_LINK         = 6,    /* Link with vnode's name as source */
        VE_RENAME_DEST_DIR      = 7,    /* Rename with vnode as target dir */
        VE_MOUNTEDOVER  = 8,    /* File or Filesystem got mounted over vnode */
        VE_TRUNCATE = 9,        /* Truncate */
        VE_PRE_RENAME_SRC = 10, /* Pre-rename, with vnode as source */
        VE_PRE_RENAME_DEST = 11, /* Pre-rename, with vnode as target/dest. */
        VE_PRE_RENAME_DEST_DIR = 12 /* Pre-rename with vnode as target dir */
} vnevent_t;

/*
 * Values for checking vnode open and map counts
 */
enum v_mode { V_READ, V_WRITE, V_RDORWR, V_RDANDWR };

typedef enum v_mode v_mode_t;

#define V_TRUE  1
#define V_FALSE 0

/*
 * Structure used on VOP_GETSECATTR and VOP_SETSECATTR operations
 */

typedef struct vsecattr {
        uint_t          vsa_mask;       /* See below */
        int             vsa_aclcnt;     /* ACL entry count */
        void            *vsa_aclentp;   /* pointer to ACL entries */
        int             vsa_dfaclcnt;   /* default ACL entry count */
        void            *vsa_dfaclentp; /* pointer to default ACL entries */
        size_t          vsa_aclentsz;   /* ACE size in bytes of vsa_aclentp */
        uint_t          vsa_aclflags;   /* ACE ACL flags */
} vsecattr_t;

/* vsa_mask values */
#define VSA_ACL                 0x0001
#define VSA_ACLCNT              0x0002
#define VSA_DFACL               0x0004
#define VSA_DFACLCNT            0x0008
#define VSA_ACE                 0x0010
#define VSA_ACECNT              0x0020
#define VSA_ACE_ALLTYPES        0x0040
#define VSA_ACE_ACLFLAGS        0x0080  /* get/set ACE ACL flags */

/*
 * Structure used by various vnode operations to determine
 * the context (pid, host, identity) of a caller.
 *
 * The cc_caller_id is used to identify one or more callers who invoke
 * operations, possibly on behalf of others.  For example, the NFS
 * server could have it's own cc_caller_id which can be detected by
 * vnode/vfs operations or (FEM) monitors on those operations.  New
 * caller IDs are generated by fs_new_caller_id().
 */
typedef struct caller_context {
        pid_t           cc_pid;         /* Process ID of the caller */
        int             cc_sysid;       /* System ID, used for remote calls */
        u_longlong_t    cc_caller_id;   /* Identifier for (set of) caller(s) */
        ulong_t         cc_flags;
} caller_context_t;

/*
 * Flags for caller context.  The caller sets CC_DONTBLOCK if it does not
 * want to block inside of a FEM monitor.  The monitor will set CC_WOULDBLOCK
 * and return EAGAIN if the operation would have blocked.
 */
#define CC_WOULDBLOCK   0x01
#define CC_DONTBLOCK    0x02

/*
 * Structure tags for function prototypes, defined elsewhere.
 */
struct pathname;
struct fid;
struct flock64;
struct flk_callback;
struct shrlock;
struct page;
struct seg;
struct as;
struct pollhead;
struct taskq;

#if defined(_KERNEL) || defined(_FAKE_KERNEL)

/*
 * VNODE_OPS defines all the vnode operations.  It is used to define
 * the vnodeops structure (below) and the fs_func_p union (vfs_opreg.h).
 */
#define VNODE_OPS                                                       \
        int     (*vop_open)(vnode_t **, int, cred_t *,                  \
                                caller_context_t *);                    \
        int     (*vop_close)(vnode_t *, int, int, offset_t, cred_t *,   \
                                caller_context_t *);                    \
        int     (*vop_read)(vnode_t *, uio_t *, int, cred_t *,          \
                                caller_context_t *);                    \
        int     (*vop_write)(vnode_t *, uio_t *, int, cred_t *,         \
                                caller_context_t *);                    \
        int     (*vop_ioctl)(vnode_t *, int, intptr_t, int, cred_t *,   \
                                int *, caller_context_t *);             \
        int     (*vop_setfl)(vnode_t *, int, int, cred_t *,             \
                                caller_context_t *);                    \
        int     (*vop_getattr)(vnode_t *, vattr_t *, int, cred_t *,     \
                                caller_context_t *);                    \
        int     (*vop_setattr)(vnode_t *, vattr_t *, int, cred_t *,     \
                                caller_context_t *);                    \
        int     (*vop_access)(vnode_t *, int, int, cred_t *,            \
                                caller_context_t *);                    \
        int     (*vop_lookup)(vnode_t *, char *, vnode_t **,            \
                                struct pathname *,                      \
                                int, vnode_t *, cred_t *,               \
                                caller_context_t *, int *,              \
                                struct pathname *);                     \
        int     (*vop_create)(vnode_t *, char *, vattr_t *, vcexcl_t,   \
                                int, vnode_t **, cred_t *, int,         \
                                caller_context_t *, vsecattr_t *);      \
        int     (*vop_remove)(vnode_t *, char *, cred_t *,              \
                                caller_context_t *, int);               \
        int     (*vop_link)(vnode_t *, vnode_t *, char *, cred_t *,     \
                                caller_context_t *, int);               \
        int     (*vop_rename)(vnode_t *, char *, vnode_t *, char *,     \
                                cred_t *, caller_context_t *, int);     \
        int     (*vop_mkdir)(vnode_t *, char *, vattr_t *, vnode_t **,  \
                                cred_t *, caller_context_t *, int,      \
                                vsecattr_t *);                          \
        int     (*vop_rmdir)(vnode_t *, char *, vnode_t *, cred_t *,    \
                                caller_context_t *, int);               \
        int     (*vop_readdir)(vnode_t *, uio_t *, cred_t *, int *,     \
                                caller_context_t *, int);               \
        int     (*vop_symlink)(vnode_t *, char *, vattr_t *, char *,    \
                                cred_t *, caller_context_t *, int);     \
        int     (*vop_readlink)(vnode_t *, uio_t *, cred_t *,           \
                                caller_context_t *);                    \
        int     (*vop_fsync)(vnode_t *, int, cred_t *,                  \
                                caller_context_t *);                    \
        void    (*vop_inactive)(vnode_t *, cred_t *,                    \
                                caller_context_t *);                    \
        int     (*vop_fid)(vnode_t *, struct fid *,                     \
                                caller_context_t *);                    \
        int     (*vop_rwlock)(vnode_t *, int, caller_context_t *);      \
        void    (*vop_rwunlock)(vnode_t *, int, caller_context_t *);    \
        int     (*vop_seek)(vnode_t *, offset_t, offset_t *,            \
                                caller_context_t *);                    \
        int     (*vop_cmp)(vnode_t *, vnode_t *, caller_context_t *);   \
        int     (*vop_frlock)(vnode_t *, int, struct flock64 *,         \
                                int, offset_t,                          \
                                struct flk_callback *, cred_t *,        \
                                caller_context_t *);                    \
        int     (*vop_space)(vnode_t *, int, struct flock64 *,          \
                                int, offset_t,                          \
                                cred_t *, caller_context_t *);          \
        int     (*vop_realvp)(vnode_t *, vnode_t **,                    \
                                caller_context_t *);                    \
        int     (*vop_getpage)(vnode_t *, offset_t, size_t, uint_t *,   \
                                struct page **, size_t, struct seg *,   \
                                caddr_t, enum seg_rw, cred_t *,         \
                                caller_context_t *);                    \
        int     (*vop_putpage)(vnode_t *, offset_t, size_t,             \
                                int, cred_t *, caller_context_t *);     \
        int     (*vop_map)(vnode_t *, offset_t, struct as *,            \
                                caddr_t *, size_t,                      \
                                uchar_t, uchar_t, uint_t, cred_t *,     \
                                caller_context_t *);                    \
        int     (*vop_addmap)(vnode_t *, offset_t, struct as *,         \
                                caddr_t, size_t,                        \
                                uchar_t, uchar_t, uint_t, cred_t *,     \
                                caller_context_t *);                    \
        int     (*vop_delmap)(vnode_t *, offset_t, struct as *,         \
                                caddr_t, size_t,                        \
                                uint_t, uint_t, uint_t, cred_t *,       \
                                caller_context_t *);                    \
        int     (*vop_poll)(vnode_t *, short, int, short *,             \
                                struct pollhead **,                     \
                                caller_context_t *);                    \
        int     (*vop_dump)(vnode_t *, caddr_t, offset_t, offset_t,     \
                                caller_context_t *);                    \
        int     (*vop_pathconf)(vnode_t *, int, ulong_t *, cred_t *,    \
                                caller_context_t *);                    \
        int     (*vop_pageio)(vnode_t *, struct page *,                 \
                                u_offset_t, size_t, int, cred_t *,      \
                                caller_context_t *);                    \
        int     (*vop_dumpctl)(vnode_t *, int, offset_t *,              \
                                caller_context_t *);                    \
        void    (*vop_dispose)(vnode_t *, struct page *,                \
                                int, int, cred_t *,                     \
                                caller_context_t *);                    \
        int     (*vop_setsecattr)(vnode_t *, vsecattr_t *,              \
                                int, cred_t *, caller_context_t *);     \
        int     (*vop_getsecattr)(vnode_t *, vsecattr_t *,              \
                                int, cred_t *, caller_context_t *);     \
        int     (*vop_shrlock)(vnode_t *, int, struct shrlock *,        \
                                int, cred_t *, caller_context_t *);     \
        int     (*vop_vnevent)(vnode_t *, vnevent_t, vnode_t *,         \
                                char *, caller_context_t *);            \
        int     (*vop_reqzcbuf)(vnode_t *, enum uio_rw, xuio_t *,       \
                                cred_t *, caller_context_t *);          \
        int     (*vop_retzcbuf)(vnode_t *, xuio_t *, cred_t *,          \
                                caller_context_t *)
        /* NB: No ";" */

/*
 * Operations on vnodes.  Note: File systems must never operate directly
 * on a 'vnodeops' structure -- it WILL change in future releases!  They
 * must use vn_make_ops() to create the structure.
 */
typedef struct vnodeops {
        const char *vnop_name;
        VNODE_OPS;      /* Signatures of all vnode operations (vops) */
} vnodeops_t;

typedef int (*fs_generic_func_p) ();    /* Generic vop/vfsop/femop/fsemop ptr */

extern int      fop_open(vnode_t **, int, cred_t *, caller_context_t *);
extern int      fop_close(vnode_t *, int, int, offset_t, cred_t *,
                                caller_context_t *);
extern int      fop_read(vnode_t *, uio_t *, int, cred_t *, caller_context_t *);
extern int      fop_write(vnode_t *, uio_t *, int, cred_t *,
                                caller_context_t *);
extern int      fop_ioctl(vnode_t *, int, intptr_t, int, cred_t *, int *,
                                caller_context_t *);
extern int      fop_setfl(vnode_t *, int, int, cred_t *, caller_context_t *);
extern int      fop_getattr(vnode_t *, vattr_t *, int, cred_t *,
                                caller_context_t *);
extern int      fop_setattr(vnode_t *, vattr_t *, int, cred_t *,
                                caller_context_t *);
extern int      fop_access(vnode_t *, int, int, cred_t *, caller_context_t *);
extern int      fop_lookup(vnode_t *, char *, vnode_t **, struct pathname *,
                                int, vnode_t *, cred_t *, caller_context_t *,
                                int *, struct pathname *);
extern int      fop_create(vnode_t *, char *, vattr_t *, vcexcl_t, int,
                                vnode_t **, cred_t *, int, caller_context_t *,
                                vsecattr_t *);
extern int      fop_remove(vnode_t *vp, char *, cred_t *, caller_context_t *,
                                int);
extern int      fop_link(vnode_t *, vnode_t *, char *, cred_t *,
                                caller_context_t *, int);
extern int      fop_rename(vnode_t *, char *, vnode_t *, char *, cred_t *,
                                caller_context_t *, int);
extern int      fop_mkdir(vnode_t *, char *, vattr_t *, vnode_t **, cred_t *,
                                caller_context_t *, int, vsecattr_t *);
extern int      fop_rmdir(vnode_t *, char *, vnode_t *, cred_t *,
                                caller_context_t *, int);
extern int      fop_readdir(vnode_t *, uio_t *, cred_t *, int *,
                                caller_context_t *, int);
extern int      fop_symlink(vnode_t *, char *, vattr_t *, char *, cred_t *,
                                caller_context_t *, int);
extern int      fop_readlink(vnode_t *, uio_t *, cred_t *, caller_context_t *);
extern int      fop_fsync(vnode_t *, int, cred_t *, caller_context_t *);
extern void     fop_inactive(vnode_t *, cred_t *, caller_context_t *);
extern int      fop_fid(vnode_t *, struct fid *, caller_context_t *);
extern int      fop_rwlock(vnode_t *, int, caller_context_t *);
extern void     fop_rwunlock(vnode_t *, int, caller_context_t *);
extern int      fop_seek(vnode_t *, offset_t, offset_t *, caller_context_t *);
extern int      fop_cmp(vnode_t *, vnode_t *, caller_context_t *);
extern int      fop_frlock(vnode_t *, int, struct flock64 *, int, offset_t,
                                struct flk_callback *, cred_t *,
                                caller_context_t *);
extern int      fop_space(vnode_t *, int, struct flock64 *, int, offset_t,
                                cred_t *, caller_context_t *);
extern int      fop_realvp(vnode_t *, vnode_t **, caller_context_t *);
extern int      fop_getpage(vnode_t *, offset_t, size_t, uint_t *,
                                struct page **, size_t, struct seg *,
                                caddr_t, enum seg_rw, cred_t *,
                                caller_context_t *);
extern int      fop_putpage(vnode_t *, offset_t, size_t, int, cred_t *,
                                caller_context_t *);
extern int      fop_map(vnode_t *, offset_t, struct as *, caddr_t *, size_t,
                                uchar_t, uchar_t, uint_t, cred_t *cr,
                                caller_context_t *);
extern int      fop_addmap(vnode_t *, offset_t, struct as *, caddr_t, size_t,
                                uchar_t, uchar_t, uint_t, cred_t *,
                                caller_context_t *);
extern int      fop_delmap(vnode_t *, offset_t, struct as *, caddr_t, size_t,
                                uint_t, uint_t, uint_t, cred_t *,
                                caller_context_t *);
extern int      fop_poll(vnode_t *, short, int, short *, struct pollhead **,
                                caller_context_t *);
extern int      fop_dump(vnode_t *, caddr_t, offset_t, offset_t,
    caller_context_t *);
extern int      fop_pathconf(vnode_t *, int, ulong_t *, cred_t *,
                                caller_context_t *);
extern int      fop_pageio(vnode_t *, struct page *, u_offset_t, size_t, int,
                                cred_t *, caller_context_t *);
extern int      fop_dumpctl(vnode_t *, int, offset_t *, caller_context_t *);
extern void     fop_dispose(vnode_t *, struct page *, int, int, cred_t *,
                                caller_context_t *);
extern int      fop_setsecattr(vnode_t *, vsecattr_t *, int, cred_t *,
                                caller_context_t *);
extern int      fop_getsecattr(vnode_t *, vsecattr_t *, int, cred_t *,
                                caller_context_t *);
extern int      fop_shrlock(vnode_t *, int, struct shrlock *, int, cred_t *,
                                caller_context_t *);
extern int      fop_vnevent(vnode_t *, vnevent_t, vnode_t *, char *,
                                caller_context_t *);
extern int      fop_reqzcbuf(vnode_t *, enum uio_rw, xuio_t *, cred_t *,
                                caller_context_t *);
extern int      fop_retzcbuf(vnode_t *, xuio_t *, cred_t *, caller_context_t *);

#endif  /* _KERNEL || _FAKE_KERNEL */

#define VOP_OPEN(vpp, mode, cr, ct) \
        fop_open(vpp, mode, cr, ct)
#define VOP_CLOSE(vp, f, c, o, cr, ct) \
        fop_close(vp, f, c, o, cr, ct)
#define VOP_READ(vp, uiop, iof, cr, ct) \
        fop_read(vp, uiop, iof, cr, ct)
#define VOP_WRITE(vp, uiop, iof, cr, ct) \
        fop_write(vp, uiop, iof, cr, ct)
#define VOP_IOCTL(vp, cmd, a, f, cr, rvp, ct) \
        fop_ioctl(vp, cmd, a, f, cr, rvp, ct)
#define VOP_SETFL(vp, f, a, cr, ct) \
        fop_setfl(vp, f, a, cr, ct)
#define VOP_GETATTR(vp, vap, f, cr, ct) \
        fop_getattr(vp, vap, f, cr, ct)
#define VOP_SETATTR(vp, vap, f, cr, ct) \
        fop_setattr(vp, vap, f, cr, ct)
#define VOP_ACCESS(vp, mode, f, cr, ct) \
        fop_access(vp, mode, f, cr, ct)
#define VOP_LOOKUP(vp, cp, vpp, pnp, f, rdir, cr, ct, defp, rpnp) \
        fop_lookup(vp, cp, vpp, pnp, f, rdir, cr, ct, defp, rpnp)
#define VOP_CREATE(dvp, p, vap, ex, mode, vpp, cr, flag, ct, vsap) \
        fop_create(dvp, p, vap, ex, mode, vpp, cr, flag, ct, vsap)
#define VOP_REMOVE(dvp, p, cr, ct, f) \
        fop_remove(dvp, p, cr, ct, f)
#define VOP_LINK(tdvp, fvp, p, cr, ct, f) \
        fop_link(tdvp, fvp, p, cr, ct, f)
#define VOP_RENAME(fvp, fnm, tdvp, tnm, cr, ct, f) \
        fop_rename(fvp, fnm, tdvp, tnm, cr, ct, f)
#define VOP_MKDIR(dp, p, vap, vpp, cr, ct, f, vsap) \
        fop_mkdir(dp, p, vap, vpp, cr, ct, f, vsap)
#define VOP_RMDIR(dp, p, cdir, cr, ct, f) \
        fop_rmdir(dp, p, cdir, cr, ct, f)
#define VOP_READDIR(vp, uiop, cr, eofp, ct, f) \
        fop_readdir(vp, uiop, cr, eofp, ct, f)
#define VOP_SYMLINK(dvp, lnm, vap, tnm, cr, ct, f) \
        fop_symlink(dvp, lnm, vap, tnm, cr, ct, f)
#define VOP_READLINK(vp, uiop, cr, ct) \
        fop_readlink(vp, uiop, cr, ct)
#define VOP_FSYNC(vp, syncflag, cr, ct) \
        fop_fsync(vp, syncflag, cr, ct)
#define VOP_INACTIVE(vp, cr, ct) \
        fop_inactive(vp, cr, ct)
#define VOP_FID(vp, fidp, ct) \
        fop_fid(vp, fidp, ct)
#define VOP_RWLOCK(vp, w, ct) \
        fop_rwlock(vp, w, ct)
#define VOP_RWUNLOCK(vp, w, ct) \
        fop_rwunlock(vp, w, ct)
#define VOP_SEEK(vp, ooff, noffp, ct) \
        fop_seek(vp, ooff, noffp, ct)
#define VOP_CMP(vp1, vp2, ct) \
        fop_cmp(vp1, vp2, ct)
#define VOP_FRLOCK(vp, cmd, a, f, o, cb, cr, ct) \
        fop_frlock(vp, cmd, a, f, o, cb, cr, ct)
#define VOP_SPACE(vp, cmd, a, f, o, cr, ct) \
        fop_space(vp, cmd, a, f, o, cr, ct)
#define VOP_REALVP(vp1, vp2, ct) \
        fop_realvp(vp1, vp2, ct)
#define VOP_GETPAGE(vp, of, sz, pr, pl, ps, sg, a, rw, cr, ct) \
        fop_getpage(vp, of, sz, pr, pl, ps, sg, a, rw, cr, ct)
#define VOP_PUTPAGE(vp, of, sz, fl, cr, ct) \
        fop_putpage(vp, of, sz, fl, cr, ct)
#define VOP_MAP(vp, of, as, a, sz, p, mp, fl, cr, ct) \
        fop_map(vp, of, as, a, sz, p, mp, fl, cr, ct)
#define VOP_ADDMAP(vp, of, as, a, sz, p, mp, fl, cr, ct) \
        fop_addmap(vp, of, as, a, sz, p, mp, fl, cr, ct)
#define VOP_DELMAP(vp, of, as, a, sz, p, mp, fl, cr, ct) \
        fop_delmap(vp, of, as, a, sz, p, mp, fl, cr, ct)
#define VOP_POLL(vp, events, anyyet, reventsp, phpp, ct) \
        fop_poll(vp, events, anyyet, reventsp, phpp, ct)
#define VOP_DUMP(vp, addr, bn, count, ct) \
        fop_dump(vp, addr, bn, count, ct)
#define VOP_PATHCONF(vp, cmd, valp, cr, ct) \
        fop_pathconf(vp, cmd, valp, cr, ct)
#define VOP_PAGEIO(vp, pp, io_off, io_len, flags, cr, ct) \
        fop_pageio(vp, pp, io_off, io_len, flags, cr, ct)
#define VOP_DUMPCTL(vp, action, blkp, ct) \
        fop_dumpctl(vp, action, blkp, ct)
#define VOP_DISPOSE(vp, pp, flag, dn, cr, ct) \
        fop_dispose(vp, pp, flag, dn, cr, ct)
#define VOP_GETSECATTR(vp, vsap, f, cr, ct) \
        fop_getsecattr(vp, vsap, f, cr, ct)
#define VOP_SETSECATTR(vp, vsap, f, cr, ct) \
        fop_setsecattr(vp, vsap, f, cr, ct)
#define VOP_SHRLOCK(vp, cmd, shr, f, cr, ct) \
        fop_shrlock(vp, cmd, shr, f, cr, ct)
#define VOP_VNEVENT(vp, vnevent, dvp, fnm, ct) \
        fop_vnevent(vp, vnevent, dvp, fnm, ct)
#define VOP_REQZCBUF(vp, rwflag, xuiop, cr, ct) \
        fop_reqzcbuf(vp, rwflag, xuiop, cr, ct)
#define VOP_RETZCBUF(vp, xuiop, cr, ct) \
        fop_retzcbuf(vp, xuiop, cr, ct)

#define VOPNAME_OPEN            "open"
#define VOPNAME_CLOSE           "close"
#define VOPNAME_READ            "read"
#define VOPNAME_WRITE           "write"
#define VOPNAME_IOCTL           "ioctl"
#define VOPNAME_SETFL           "setfl"
#define VOPNAME_GETATTR         "getattr"
#define VOPNAME_SETATTR         "setattr"
#define VOPNAME_ACCESS          "access"
#define VOPNAME_LOOKUP          "lookup"
#define VOPNAME_CREATE          "create"
#define VOPNAME_REMOVE          "remove"
#define VOPNAME_LINK            "link"
#define VOPNAME_RENAME          "rename"
#define VOPNAME_MKDIR           "mkdir"
#define VOPNAME_RMDIR           "rmdir"
#define VOPNAME_READDIR         "readdir"
#define VOPNAME_SYMLINK         "symlink"
#define VOPNAME_READLINK        "readlink"
#define VOPNAME_FSYNC           "fsync"
#define VOPNAME_INACTIVE        "inactive"
#define VOPNAME_FID             "fid"
#define VOPNAME_RWLOCK          "rwlock"
#define VOPNAME_RWUNLOCK        "rwunlock"
#define VOPNAME_SEEK            "seek"
#define VOPNAME_CMP             "cmp"
#define VOPNAME_FRLOCK          "frlock"
#define VOPNAME_SPACE           "space"
#define VOPNAME_REALVP          "realvp"
#define VOPNAME_GETPAGE         "getpage"
#define VOPNAME_PUTPAGE         "putpage"
#define VOPNAME_MAP             "map"
#define VOPNAME_ADDMAP          "addmap"
#define VOPNAME_DELMAP          "delmap"
#define VOPNAME_POLL            "poll"
#define VOPNAME_DUMP            "dump"
#define VOPNAME_PATHCONF        "pathconf"
#define VOPNAME_PAGEIO          "pageio"
#define VOPNAME_DUMPCTL         "dumpctl"
#define VOPNAME_DISPOSE         "dispose"
#define VOPNAME_GETSECATTR      "getsecattr"
#define VOPNAME_SETSECATTR      "setsecattr"
#define VOPNAME_SHRLOCK         "shrlock"
#define VOPNAME_VNEVENT         "vnevent"
#define VOPNAME_REQZCBUF        "reqzcbuf"
#define VOPNAME_RETZCBUF        "retzcbuf"

/*
 * Flags for VOP_LOOKUP
 *
 * Defined in file.h, but also possible, FIGNORECASE and FSEARCH
 *
 */
#define LOOKUP_DIR              0x01    /* want parent dir vp */
#define LOOKUP_XATTR            0x02    /* lookup up extended attr dir */
#define CREATE_XATTR_DIR        0x04    /* Create extended attr dir */
#define LOOKUP_HAVE_SYSATTR_DIR 0x08    /* Already created virtual GFS dir */
/* LOOKUP_CHECKREAD             0x10    - private lookuppnvp flag */
#define LOOKUP_NOACLCHECK       0x20    /* Dont check ACL when checking perms */

/*
 * Flags for VOP_READDIR
 */
#define V_RDDIR_ENTFLAGS        0x01    /* request dirent flags */
#define V_RDDIR_ACCFILTER       0x02    /* filter out inaccessible dirents */

/*
 * Flags for VOP_RWLOCK/VOP_RWUNLOCK
 * VOP_RWLOCK will return the flag that was actually set, or -1 if none.
 */
#define V_WRITELOCK_TRUE        (1)     /* Request write-lock on the vnode */
#define V_WRITELOCK_FALSE       (0)     /* Request read-lock on the vnode */

/*
 * Flags for VOP_DUMPCTL
 */
#define DUMP_ALLOC      0
#define DUMP_FREE       1
#define DUMP_SCAN       2

/*
 * Public vnode manipulation functions.
 */
#if defined(_KERNEL) || defined(_FAKE_KERNEL)

vnode_t *vn_alloc(int);
void    vn_reinit(vnode_t *);
void    vn_recycle(vnode_t *);
void    vn_free(vnode_t *);

int     vn_is_readonly(vnode_t *);
int     vn_is_opened(vnode_t *, v_mode_t);
int     vn_is_mapped(vnode_t *, v_mode_t);
int     vn_has_other_opens(vnode_t *, v_mode_t);
void    vn_open_upgrade(vnode_t *, int);
void    vn_open_downgrade(vnode_t *, int);

int     vn_can_change_zones(vnode_t *vp);

int     vn_has_flocks(vnode_t *);
int     vn_has_mandatory_locks(vnode_t *, int);
int     vn_has_cached_data(vnode_t *);

void    vn_setops(vnode_t *, vnodeops_t *);
vnodeops_t *vn_getops(vnode_t *);
int     vn_matchops(vnode_t *, vnodeops_t *);
int     vn_matchopval(vnode_t *, char *, fs_generic_func_p);
int     vn_ismntpt(vnode_t *);

struct vfs *vn_mountedvfs(vnode_t *);

int     vn_in_dnlc(vnode_t *);

void    vn_create_cache(void);
void    vn_destroy_cache(void);

void    vn_freevnodeops(vnodeops_t *);

int     vn_open(char *pnamep, enum uio_seg seg, int filemode, int createmode,
                struct vnode **vpp, enum create crwhy, mode_t umask);
int     vn_openat(char *pnamep, enum uio_seg seg, int filemode, int createmode,
                struct vnode **vpp, enum create crwhy,
                mode_t umask, struct vnode *startvp, int fd);
int     vn_create(char *pnamep, enum uio_seg seg, struct vattr *vap,
                enum vcexcl excl, int mode, struct vnode **vpp,
                enum create why, int flag, mode_t umask);
int     vn_createat(char *pnamep, enum uio_seg seg, struct vattr *vap,
                enum vcexcl excl, int mode, struct vnode **vpp,
                enum create why, int flag, mode_t umask, struct vnode *startvp);
int     vn_rdwr(enum uio_rw rw, struct vnode *vp, caddr_t base, ssize_t len,
                offset_t offset, enum uio_seg seg, int ioflag, rlim64_t ulimit,
                cred_t *cr, ssize_t *residp);
void    vn_rele(struct vnode *vp);
void    vn_rele_async(struct vnode *vp, struct taskq *taskq);
void    vn_rele_dnlc(struct vnode *vp);
void    vn_rele_stream(struct vnode *vp);
int     vn_link(char *from, char *to, enum uio_seg seg);
int     vn_linkat(vnode_t *fstartvp, char *from, enum symfollow follow,
                vnode_t *tstartvp, char *to, enum uio_seg seg);
int     vn_rename(char *from, char *to, enum uio_seg seg);
int     vn_renameat(vnode_t *fdvp, char *fname, vnode_t *tdvp, char *tname,
                enum uio_seg seg);
int     vn_remove(char *fnamep, enum uio_seg seg, enum rm dirflag);
int     vn_removeat(vnode_t *startvp, char *fnamep, enum uio_seg seg,
                enum rm dirflag);
int     vn_compare(vnode_t *vp1, vnode_t *vp2);
int     vn_vfswlock(struct vnode *vp);
int     vn_vfswlock_wait(struct vnode *vp);
int     vn_vfsrlock(struct vnode *vp);
int     vn_vfsrlock_wait(struct vnode *vp);
void    vn_vfsunlock(struct vnode *vp);
int     vn_vfswlock_held(struct vnode *vp);
vnode_t *specvp(struct vnode *vp, dev_t dev, vtype_t type, struct cred *cr);
vnode_t *makespecvp(dev_t dev, vtype_t type);

#if !defined(_FAKE_KERNEL)
vn_vfslocks_entry_t *vn_vfslocks_getlock(void *);
void    vn_vfslocks_rele(vn_vfslocks_entry_t *);
#endif

boolean_t vn_is_reparse(vnode_t *, cred_t *, caller_context_t *);

void vn_copypath(struct vnode *src, struct vnode *dst);
void vn_setpath_str(struct vnode *vp, const char *str, size_t len);
void vn_setpath(vnode_t *rootvp, struct vnode *startvp, struct vnode *vp,
    const char *path, size_t plen);
void vn_renamepath(vnode_t *dvp, vnode_t *vp, const char *nm, size_t len);

/* Private vnode manipulation functions */
void vn_clearpath(vnode_t *, hrtime_t);
void vn_updatepath(vnode_t *, vnode_t *, const char *);


/* Vnode event notification */
void    vnevent_rename_src(vnode_t *, vnode_t *, char *, caller_context_t *);
void    vnevent_rename_dest(vnode_t *, vnode_t *, char *, caller_context_t *);
void    vnevent_remove(vnode_t *, vnode_t *, char *, caller_context_t *);
void    vnevent_rmdir(vnode_t *, vnode_t *, char *, caller_context_t *);
void    vnevent_create(vnode_t *, caller_context_t *);
void    vnevent_link(vnode_t *, caller_context_t *);
void    vnevent_rename_dest_dir(vnode_t *, caller_context_t *ct);
void    vnevent_mountedover(vnode_t *, caller_context_t *);
void    vnevent_truncate(vnode_t *, caller_context_t *);
int     vnevent_support(vnode_t *, caller_context_t *);
void    vnevent_pre_rename_src(vnode_t *, vnode_t *, char *,
            caller_context_t *);
void    vnevent_pre_rename_dest(vnode_t *, vnode_t *, char *,
            caller_context_t *);
void    vnevent_pre_rename_dest_dir(vnode_t *, vnode_t *, char *,
            caller_context_t *);

/* Vnode specific data */
void vsd_create(uint_t *, void (*)(void *));
void vsd_destroy(uint_t *);
void *vsd_get(vnode_t *, uint_t);
int vsd_set(vnode_t *, uint_t, void *);
void vsd_free(vnode_t *);

/*
 * Extensible vnode attribute (xva) routines:
 * xva_init() initializes an xvattr_t (zero struct, init mapsize, set AT_XATTR)
 * xva_getxoptattr() returns a ponter to the xoptattr_t section of xvattr_t
 */
void            xva_init(xvattr_t *);
xoptattr_t      *xva_getxoptattr(xvattr_t *);   /* Get ptr to xoptattr_t */

void xattr_init(void);          /* Initialize vnodeops for xattrs */

/* GFS tunnel for xattrs */
int xattr_dir_lookup(vnode_t *, vnode_t **, int, cred_t *);

/* Reparse Point */
void reparse_point_init(void);

/* Context identification */
u_longlong_t    fs_new_caller_id();

int     vn_vmpss_usepageio(vnode_t *);

/* Empty v_path placeholder */
extern char *vn_vpath_empty;

/*
 * Needed for use of IS_VMODSORT() in kernel.
 */
extern uint_t pvn_vmodsort_supported;

/*
 * All changes to v_count should be done through VN_HOLD() or VN_RELE(), or
 * one of their variants. This makes it possible to ensure proper locking,
 * and to guarantee that all modifications are accompanied by a firing of
 * the vn-hold or vn-rele SDT DTrace probe.
 *
 * Example DTrace command for tracing vnode references using these probes:
 *
 * dtrace -q -n 'sdt:::vn-hold,sdt:::vn-rele
 * {
 *      this->vp = (vnode_t *)arg0;
 *      printf("%s %s(%p[%s]) %d\n", execname, probename, this->vp,
 *          this->vp->v_path == NULL ? "NULL" : stringof(this->vp->v_path),
 *          this->vp->v_count)
 * }'
 */
#define VN_HOLD_LOCKED(vp) {                    \
        ASSERT(mutex_owned(&(vp)->v_lock));     \
        (vp)->v_count++;                        \
        DTRACE_PROBE1(vn__hold, vnode_t *, vp); \
}

#define VN_HOLD(vp)     {               \
        mutex_enter(&(vp)->v_lock);     \
        VN_HOLD_LOCKED(vp);             \
        mutex_exit(&(vp)->v_lock);      \
}

#define VN_RELE(vp)     { \
        vn_rele(vp); \
}

#define VN_RELE_ASYNC(vp, taskq)        { \
        vn_rele_async(vp, taskq); \
}

#define VN_RELE_LOCKED(vp) {                    \
        ASSERT(mutex_owned(&(vp)->v_lock));     \
        ASSERT((vp)->v_count >= 1);             \
        (vp)->v_count--;                        \
        DTRACE_PROBE1(vn__rele, vnode_t *, vp); \
}

#define VN_SET_VFS_TYPE_DEV(vp, vfsp, type, dev)        { \
        (vp)->v_vfsp = (vfsp); \
        (vp)->v_type = (type); \
        (vp)->v_rdev = (dev); \
}

/*
 * Compare two vnodes for equality.  In general this macro should be used
 * in preference to calling VOP_CMP directly.
 */
#define VN_CMP(VP1, VP2)        ((VP1) == (VP2) ? 1 :   \
        ((VP1) && (VP2) && (vn_getops(VP1) == vn_getops(VP2)) ? \
        VOP_CMP(VP1, VP2, NULL) : 0))

/*
 * Some well-known global vnodes used by the VM system to name pages.
 */
extern struct vnode kvps[];

typedef enum {
        KV_KVP,         /* vnode for all segkmem pages */
        KV_ZVP,         /* vnode for all ZFS pages */
        KV_VVP,         /* vnode for all VMM pages */
#if defined(__sparc)
        KV_MPVP,        /* vnode for all page_t meta-pages */
        KV_PROMVP,      /* vnode for all PROM pages */
#endif  /* __sparc */
        KV_MAX          /* total number of vnodes in kvps[] */
} kvps_index_t;

#define VN_ISKAS(vp)    ((vp) >= &kvps[0] && (vp) < &kvps[KV_MAX])

#endif  /* _KERNEL || _FAKE_KERNEL */

/*
 * Flags to VOP_SETATTR/VOP_GETATTR.
 */
#define ATTR_UTIME      0x01    /* non-default utime(2) request */
#define ATTR_EXEC       0x02    /* invocation from exec(2) */
#define ATTR_COMM       0x04    /* yield common vp attributes */
#define ATTR_HINT       0x08    /* information returned will be `hint' */
#define ATTR_REAL       0x10    /* yield attributes of the real vp */
#define ATTR_NOACLCHECK 0x20    /* Don't check ACL when checking permissions */
#define ATTR_TRIGGER    0x40    /* Mount first if vnode is a trigger mount */
#define ATTR_NOIMPLICIT 0x80    /* Disable any implicit owner rights */
/*
 * Generally useful macros.
 */
#define VBSIZE(vp)      ((vp)->v_vfsp->vfs_bsize)

#define VTOZONE(vp)     ((vp)->v_vfsp->vfs_zone)

#define NULLVP          ((struct vnode *)0)
#define NULLVPP         ((struct vnode **)0)

#ifdef  _KERNEL

/*
 * Structure used while handling asynchronous VOP_PUTPAGE operations.
 */
struct async_reqs {
        struct async_reqs *a_next;      /* pointer to next arg struct */
        struct vnode *a_vp;             /* vnode pointer */
        u_offset_t a_off;                       /* offset in file */
        uint_t a_len;                   /* size of i/o request */
        int a_flags;                    /* flags to indicate operation type */
        struct cred *a_cred;            /* cred pointer */
        ushort_t a_prealloced;          /* set if struct is pre-allocated */
};

/*
 * VN_DISPOSE() -- given a page pointer, safely invoke VOP_DISPOSE().
 * Note that there is no guarantee that the page passed in will be
 * freed.  If that is required, then a check after calling VN_DISPOSE would
 * be necessary to ensure the page was freed.
 */
#define VN_DISPOSE(pp, flag, dn, cr)    { \
        if ((pp)->p_vnode != NULL && !VN_ISKAS((pp)->p_vnode)) \
                VOP_DISPOSE((pp)->p_vnode, (pp), (flag), (dn), (cr), NULL); \
        else if ((flag) == B_FREE) \
                page_free((pp), (dn)); \
        else \
                page_destroy((pp), (dn)); \
        }

#endif  /* _KERNEL */

#ifdef  __cplusplus
}
#endif

#endif  /* _SYS_VNODE_H */