sys/sys/vfscache.h

   1 /*
   2  * Copyright (c) 2004 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com>
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  *
  35  * Copyright (c) 1989, 1993
  36  *      The Regents of the University of California.  All rights reserved.
  37  *
  38  * Redistribution and use in source and binary forms, with or without
  39  * modification, are permitted provided that the following conditions
  40  * are met:
  41  * 1. Redistributions of source code must retain the above copyright
  42  *    notice, this list of conditions and the following disclaimer.
  43  * 2. Redistributions in binary form must reproduce the above copyright
  44  *    notice, this list of conditions and the following disclaimer in the
  45  *    documentation and/or other materials provided with the distribution.
  46  * 3. All advertising materials mentioning features or use of this software
  47  *    must display the following acknowledgement:
  48  *      This product includes software developed by the University of
  49  *      California, Berkeley and its contributors.
  50  * 4. Neither the name of the University nor the names of its contributors
  51  *    may be used to endorse or promote products derived from this software
  52  *    without specific prior written permission.
  53  *
  54  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  55  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  56  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  57  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  58  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  59  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  60  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  61  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  62  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  63  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  64  * SUCH DAMAGE.
  65  *
  66  * $DragonFly: src/sys/sys/vfscache.h,v 1.3 2005/09/17 07:43:01 dillon Exp $
  67  */
  68 /*
  69  * This module serves as a focal point for virtually all filesystem and
  70  * device related calls.  It is or will be responsible for all high level
  71  * kernel management for filesystem and device operations, including but
  72  * limited to:
  73  *
  74  *      Function                        Status
  75  *      ----------------                -----
  76  *      Journaling                      TODO
  77  *      Range Locking                   TODO
  78  *      Cache Coherency                 TODO
  79  *      VNode Operations Dispatch       TODO
  80  *      Mount Point Operations          TODO
  81  *      FileOps Operations              TODO
  82  */
  83
  84 #ifndef _SYS_VFSCACHE_H_
  85 #define _SYS_VFSCACHE_H_
  86
  87 #ifndef _SYS_VFSOPS_H_
  88 #include <sys/vfsops.h>
  89 #endif
  90
  91 /*
  92  * Vnode types.  VNON means no type.
  93  */
  94 enum vtype      { VNON, VREG, VDIR, VBLK, VCHR, VLNK, VSOCK, VFIFO, VBAD };
  95
  96 /*
  97  * Vnode tag types.
  98  * These are for the benefit of external programs only (e.g., pstat)
  99  * and should NEVER be inspected by the kernel.
 100  */
 101 enum vtagtype   {
 102         VT_NON, VT_UFS, VT_NFS, VT_MFS, VT_PC, VT_LFS, VT_LOFS, VT_FDESC,
 103         VT_PORTAL, VT_NULL, VT_UMAP, VT_KERNFS, VT_PROCFS, VT_AFS, VT_ISOFS,
 104         VT_UNION, VT_MSDOSFS, VT_TFS, VT_VFS, VT_CODA, VT_NTFS,
 105         VT_HPFS, VT_NWFS, VT_SMBFS, VT_UDF
 106 };
 107
 108 /*
 109  * Vnode attributes.  A field value of VNOVAL represents a field whose value
 110  * is unavailable (getattr) or which is not to be changed (setattr).
 111  */
 112 struct vattr {
 113         enum vtype      va_type;        /* vnode type (for create) */
 114         nlink_t         va_nlink;       /* number of references to file */
 115         u_short         va_mode;        /* files access mode and type */
 116         uid_t           va_uid;         /* owner user id */
 117         gid_t           va_gid;         /* owner group id */
 118         udev_t          va_fsid;        /* file system id */
 119         long            va_fileid;      /* file id */
 120         u_quad_t        va_size;        /* file size in bytes */
 121         long            va_blocksize;   /* blocksize preferred for i/o */
 122         struct timespec va_atime;       /* time of last access */
 123         struct timespec va_mtime;       /* time of last modification */
 124         struct timespec va_ctime;       /* time file changed */
 125         u_long          va_gen;         /* generation number of file */
 126         u_long          va_flags;       /* flags defined for file */
 127         udev_t          va_rdev;        /* device the special file represents */
 128         u_quad_t        va_bytes;       /* bytes of disk space held by file */
 129         u_quad_t        va_filerev;     /* file modification number */
 130         u_int           va_vaflags;     /* operations flags, see below */
 131         long            va_spare;       /* remain quad aligned */
 132         int64_t         va_fsmid;       /* filesystem modification id */
 133 };
 134
 135 /*
 136  * Flags for va_vaflags.
 137  */
 138 #define VA_UTIMES_NULL  0x01            /* utimes argument was NULL */
 139 #define VA_EXCLUSIVE    0x02            /* exclusive create request */
 140
 141 #if 0   /* NOT YET */
 142
 143 /*
 144  * The vfscache structure holds the system cacheable elements associated with
 145  * a file or device.  This structure is most typically embedded within a
 146  * vnode.
 147  */
 148 struct vfscache {
 149         int                     fc_flags;
 150         struct vm_object        *fc_object;     /* cached data */
 151         struct vattr            fc_attr;        /* cached attribute data */
 152 };
 153
 154 #define FCF_ATTR_GOOD           0x00000001      /* FUTURE */
 155 #define FCF_ATTR_ATIME          0x00010000      /* FUTURE attr modifications */
 156 #define FCF_ATTR_MTIME          0x00020000      /* FUTURE attr modifications */
 157 #define FCF_ATTR_CTIME          0x00040000      /* FUTURE attr modifications */
 158 #define FCF_ATTR_UID            0x00080000      /* FUTURE attr modifications */
 159 #define FCF_ATTR_GID            0x00100000      /* FUTURE attr modifications */
 160 #define FCF_ATTR_SIZE           0x00200000      /* FUTURE attr modifications */
 161
 162 #endif
 163
 164 #endif
 165