FreeBSD/Linux Kernel Cross Reference
sys/sys/fstypes.h

     /*      $NetBSD: fstypes.h,v 1.41 2021/09/18 03:05:20 christos Exp $    */
     
     /*
      * Copyright (c) 1989, 1991, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * 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.
     *
     *      @(#)mount.h     8.21 (Berkeley) 5/20/95
     */
    
    #ifndef _SYS_FSTYPES_H_
    #define _SYS_FSTYPES_H_
    
    typedef struct { int32_t __fsid_val[2]; } fsid_t; /* file system id type */
    
    #if defined(_KERNEL)
    /*
     * File identifier.
     * These are unique per filesystem on a single machine.
     */
    struct fid {
            unsigned short  fid_len;                /* length of data in bytes */
            unsigned short  fid_reserved;           /* compat: historic align */
            char            fid_data[0];            /* data (variable length) */
    };
    
    /*
     * Generic file handle
     */
    struct fhandle {
            fsid_t  fh_fsid;        /* File system id of mount point */
            struct  fid fh_fid;     /* File sys specific id */
    };
    typedef struct fhandle  fhandle_t;
    
    /*
     * FHANDLE_SIZE_MAX: arbitrary value to prevent unreasonable allocation.
     *
     * FHANDLE_SIZE_MIN: chosen for compatibility.  smaller handles are zero-padded.
     */
    
    #define FHANDLE_SIZE_COMPAT     28
    #define FHANDLE_SIZE_MAX        1024
    #define FHANDLE_SIZE_MIN        FHANDLE_SIZE_COMPAT
    
    #define FHANDLE_FSID(fh)        (&(fh)->fh_fsid)
    #define FHANDLE_FILEID(fh)      (&(fh)->fh_fid)
    #define FHANDLE_SIZE_FROM_FILEID_SIZE(fidsize) \
            MAX(FHANDLE_SIZE_MIN, (offsetof(fhandle_t, fh_fid) + (fidsize)))
    #define FHANDLE_SIZE(fh) \
            FHANDLE_SIZE_FROM_FILEID_SIZE(FHANDLE_FILEID(fh)->fid_len)
    #endif /* defined(_KERNEL) */
    
    /*
     * Mount flags.  XXX BEWARE: these are not in numerical order!
     *
     * Unmount uses MNT_FORCE flag.
     *
     * Note that all mount flags are listed here.  if you need to add one, take
     * one of the __MNT_UNUSED flags.
     */
    
    
    #define MNT_RDONLY      0x00000001      /* read only filesystem */
    #define MNT_SYNCHRONOUS 0x00000002      /* file system written synchronously */
    #define MNT_NOEXEC      0x00000004      /* can't exec from filesystem */
    #define MNT_NOSUID      0x00000008      /* don't honor setuid bits on fs */
    #define MNT_NODEV       0x00000010      /* don't interpret special files */
    #define MNT_UNION       0x00000020      /* union with underlying filesystem */
    #define MNT_ASYNC       0x00000040      /* file system written asynchronously */
    #define MNT_NOCOREDUMP  0x00008000      /* don't write core dumps to this FS */
    #define MNT_RELATIME    0x00020000      /* only update access time if mod/ch */
    #define MNT_IGNORE      0x00100000      /* don't show entry in df */
    #define MNT_NFS4ACLS    0x00200000      /* uses NFS4 Access Control Lists */
    #define MNT_DISCARD     0x00800000      /* use DISCARD/TRIM if supported */
    #define MNT_EXTATTR     0x01000000      /* enable extended attributes */
   #define MNT_LOG         0x02000000      /* Use logging */
   #define MNT_NOATIME     0x04000000      /* Never update access times in fs */
   #define MNT_AUTOMOUNTED 0x10000000      /* mounted by automountd(8) */
   #define MNT_SYMPERM     0x20000000      /* recognize symlink permission */
   #define MNT_NODEVMTIME  0x40000000      /* Never update mod times for devs */
   #define MNT_SOFTDEP     0x80000000      /* Use soft dependencies */
   #define MNT_POSIX1EACLS 0x00000800      /* shared with EXKERB */
   #define MNT_ACLS        MNT_POSIX1EACLS /* synonym */
   
   #define __MNT_BASIC_FLAGS \
           { MNT_ASYNC,            0,      "asynchronous" }, \
           { MNT_AUTOMOUNTED,      0,      "automounted" }, \
           { MNT_NFS4ACLS,         0,      "nfs4acls" }, \
           { MNT_POSIX1EACLS,      0,      "posix1eacls" }, \
           { MNT_DISCARD,          0,      "discard" }, \
           { MNT_EXTATTR,          0,      "extattr" }, \
           { MNT_IGNORE,           0,      "hidden" }, \
           { MNT_LOG,              0,      "log" }, \
           { MNT_NOATIME,          0,      "noatime" }, \
           { MNT_NOCOREDUMP,       0,      "nocoredump" }, \
           { MNT_NODEV,            0,      "nodev" }, \
           { MNT_NODEVMTIME,       0,      "nodevmtime" }, \
           { MNT_NOEXEC,           0,      "noexec" }, \
           { MNT_NOSUID,           0,      "nosuid" }, \
           { MNT_RDONLY,           0,      "read-only" }, \
           { MNT_RELATIME,         0,      "relatime" }, \
           { MNT_SOFTDEP,          0,      "soft dependencies" }, \
           { MNT_SYMPERM,          0,      "symperm" }, \
           { MNT_SYNCHRONOUS,      0,      "synchronous" }, \
           { MNT_UNION,            0,      "union" }, \
   
   #define MNT_BASIC_FLAGS (MNT_ASYNC | MNT_AUTOMOUNTED | MNT_DISCARD | \
       MNT_EXTATTR | MNT_LOG | MNT_NOATIME | MNT_NOCOREDUMP | MNT_NODEV | \
       MNT_NODEVMTIME | MNT_NOEXEC | MNT_NOSUID | MNT_RDONLY | MNT_RELATIME | \
       MNT_SOFTDEP | MNT_SYMPERM | MNT_SYNCHRONOUS | MNT_UNION | MNT_NFS4ACLS | \
       MNT_POSIX1EACLS)
   /*
    * exported mount flags.
    */
   #define MNT_EXRDONLY    0x00000080      /* exported read only */
   #define MNT_EXPORTED    0x00000100      /* file system is exported */
   #define MNT_DEFEXPORTED 0x00000200      /* exported to the world */
   #define MNT_EXPORTANON  0x00000400      /* use anon uid mapping for everyone */
   #define MNT_EXKERB      0x00000800      /* exported with Kerberos uid mapping */
   #define MNT_EXNORESPORT 0x08000000      /* don't enforce reserved ports (NFS) */
   #define MNT_EXPUBLIC    0x10000000      /* public export (WebNFS) */
   
   #define __MNT_EXPORTED_FLAGS \
           { MNT_EXRDONLY,         1,      "exported read-only" }, \
           { MNT_EXPORTED,         0,      "NFS exported" }, \
           { MNT_DEFEXPORTED,      1,      "exported to the world" }, \
           { MNT_EXPORTANON,       1,      "anon uid mapping" }, \
           { MNT_EXKERB,           1,      "kerberos uid mapping/posix1e ACLS" }, \
           { MNT_EXNORESPORT,      0,      "non-reserved ports" }, \
           { MNT_EXPUBLIC,         0,      "WebNFS exports" },
   
   /*
    * Flags set by internal operations.
    */
   #define MNT_LOCAL       0x00001000      /* filesystem is stored locally */
   #define MNT_QUOTA       0x00002000      /* quotas are enabled on filesystem */
   #define MNT_ROOTFS      0x00004000      /* identifies the root filesystem */
   
   #define __MNT_INTERNAL_FLAGS \
           { MNT_LOCAL,            0,      "local" }, \
           { MNT_QUOTA,            0,      "with quotas" }, \
           { MNT_ROOTFS,           1,      "root file system" },
   
   /*
    * Mask of flags that are visible to statvfs()
    */
   #define MNT_VISFLAGMASK ( \
        MNT_RDONLY | \
        MNT_SYNCHRONOUS | \
        MNT_NOEXEC | \
        MNT_NOSUID | \
        MNT_NODEV | \
        MNT_UNION | \
        MNT_NFS4ACLS | \
        MNT_ASYNC | \
        MNT_NOCOREDUMP | \
        MNT_IGNORE | \
        MNT_DISCARD | \
        MNT_NOATIME | \
        MNT_SYMPERM | \
        MNT_NODEVMTIME | \
        MNT_SOFTDEP | \
        MNT_EXRDONLY | \
        MNT_EXPORTED | \
        MNT_DEFEXPORTED | \
        MNT_EXPORTANON | \
        MNT_EXKERB | \
        MNT_EXNORESPORT | \
        MNT_EXPUBLIC | \
        MNT_LOCAL | \
        MNT_QUOTA | \
        MNT_ROOTFS | \
        MNT_LOG | \
        MNT_POSIX1EACLS | \
        MNT_EXTATTR | \
        MNT_AUTOMOUNTED)
   
   /*
    * External filesystem control flags.
    */
   #define MNT_UPDATE      0x00010000      /* not a real mount, just an update */
   #define MNT_RELOAD      0x00040000      /* reload filesystem data */
   #define MNT_FORCE       0x00080000      /* force unmount or readonly change */
   #define MNT_GETARGS     0x00400000      /* retrieve file system specific args */
   
   #define MNT_OP_FLAGS    (MNT_UPDATE|MNT_RELOAD|MNT_FORCE|MNT_GETARGS)
   
   #define __MNT_EXTERNAL_FLAGS \
           { MNT_UPDATE,           1,      "being updated" }, \
           { MNT_RELOAD,           1,      "reload filesystem data" }, \
           { MNT_FORCE,            1,      "force unmount or readonly change" }, \
           { MNT_GETARGS,          1,      "retrieve mount arguments" },
   
   /*
    * Internal filesystem control flags.
    * These are set in struct mount mnt_iflag.
    *
    * IMNT_UNMOUNT locks the mount entry so that name lookup cannot proceed
    * past the mount point.  This keeps the subtree stable during mounts
    * and unmounts.
    */
   #define IMNT_GONE       0x00000001      /* filesystem is gone.. */
   #define IMNT_UNMOUNT    0x00000002      /* unmount in progress */
   #define IMNT_WANTRDWR   0x00000004      /* upgrade to read/write requested */
   #define IMNT_WANTRDONLY 0x00000008      /* upgrade to readonly requested */
   #define IMNT_NCLOOKUP   0x00000020      /* can do lookop direct in namecache */
   #define IMNT_DTYPE      0x00000040      /* returns d_type fields */
   #define IMNT_SHRLOOKUP  0x00000080      /* can do LK_SHARED lookups */
   #define IMNT_MPSAFE     0x00000100      /* file system code MP safe */
   #define IMNT_CAN_RWTORO 0x00000200      /* can downgrade fs to from rw to r/o */
   #define IMNT_ONWORKLIST 0x00000400      /* on syncer worklist */
   
   #define __MNT_FLAGS \
           __MNT_BASIC_FLAGS \
           __MNT_EXPORTED_FLAGS \
           __MNT_INTERNAL_FLAGS \
           __MNT_EXTERNAL_FLAGS
   
   #define __MNT_FLAG_BITS \
           "\2" \
           "\40MNT_SOFTDEP" \
           "\37MNT_NODEVMTIME" \
           "\36MNT_SYMPERM" \
           "\35MNT_EXPUBLIC" \
           "\34MNT_EXNORESPORT" \
           "\33MNT_NOATIME" \
           "\32MNT_LOG" \
           "\31MNT_EXTATTR" \
           "\30MNT_DISCARD" \
           "\27MNT_GETARGS" \
           "\26MNT_NFS4ACLS" \
           "\25MNT_IGNORE" \
           "\24MNT_FORCE" \
           "\23MNT_RELOAD" \
           "\22MNT_RELATIME" \
           "\21MNT_UPDATE" \
           "\20MNT_NOCOREDUMP" \
           "\17MNT_ROOTFS" \
           "\16MNT_QUOTA" \
           "\15MNT_LOCAL" \
           "\14MNT_EXKERB|MNT_POSIX1EACLS" \
           "\13MNT_EXPORTANON" \
           "\12MNT_DEFEXPORTED" \
           "\11MNT_EXPORTED" \
           "\10MNT_EXRDONLY" \
           "\07MNT_ASYNC" \
           "\06MNT_UNION" \
           "\05MNT_NODEV" \
           "\04MNT_NOSUID" \
           "\03MNT_NOEXEC" \
           "\02MNT_SYNCHRONOUS" \
           "\01MNT_RDONLY"
   
   #define __IMNT_FLAG_BITS \
           "\2" \
           "\13IMNT_ONWORKLIST" \
           "\12IMNT_CAN_RWTORO" \
           "\11IMNT_MPSAFE" \
           "\10IMNT_SHRLOOKUP" \
           "\07IMNT_DTYPE" \
           "\06IMNT_NCLOOKUP" \
           "\04IMNT_WANTRDONLY" \
           "\03IMNT_WANTRDWR" \
           "\02IMNT_UNMOUNT" \
           "\01IMNT_GONE"
   
   /*
    * Flags for various system call interfaces.
    *
    * waitfor flags to vfs_sync() and getvfsstat()
    */
   #define MNT_WAIT        1       /* synchronously wait for I/O to complete */
   #define MNT_NOWAIT      2       /* start all I/O, but do not wait for it */
   #define MNT_LAZY        3       /* push data not written by filesystem syncer */
   #endif /* _SYS_FSTYPES_H_ */

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