sys/sys/mountctl.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  * $DragonFly: src/sys/sys/mountctl.h,v 1.10 2005/08/24 20:28:33 dillon Exp $
  35  */
  36
  37 #ifndef _SYS_MOUNTCTL_H_
  38 #define _SYS_MOUNTCTL_H_
  39 /*
  40  * General constants
  41  */
  42
  43 #define JIDMAX          32      /* id string buf[] size (incls \0) */
  44
  45 /*
  46  * Data structures for the journaling API
  47  */
  48
  49 #define MOUNTCTL_INSTALL_VFS_JOURNAL    1
  50 #define MOUNTCTL_REMOVE_VFS_JOURNAL     2
  51 #define MOUNTCTL_RESYNC_VFS_JOURNAL     3
  52 #define MOUNTCTL_STATUS_VFS_JOURNAL     4
  53 #define MOUNTCTL_RESTART_VFS_JOURNAL    5
  54
  55 #define MOUNTCTL_INSTALL_BLK_JOURNAL    8
  56 #define MOUNTCTL_REMOVE_BLK_JOURNAL     9
  57 #define MOUNTCTL_RESYNC_BLK_JOURNAL     10
  58 #define MOUNTCTL_STATUS_BLK_JOURNAL     11
  59
  60 struct mountctl_install_journal {
  61         char    id[JIDMAX];
  62         int     flags;          /* journaling flags */
  63         int     unused01;
  64         int64_t membufsize;     /* backing store */
  65         int64_t swapbufsize;    /* backing store */
  66         int64_t transid;        /* starting with specified transaction id */
  67         int64_t unused02;
  68         int     stallwarn;      /* stall warning (seconds) */
  69         int     stallerror;     /* stall error (seconds) */
  70         int     unused03;
  71         int     unused04;
  72 };
  73
  74 #define MC_JOURNAL_UNUSED0001           0x00000001
  75 #define MC_JOURNAL_STOP_REQ             0x00000002      /* stop request pend */
  76 #define MC_JOURNAL_STOP_IMM             0x00000004      /* STOP+trash fifo */
  77 #define MC_JOURNAL_WACTIVE              0x00000008      /* wthread running */
  78 #define MC_JOURNAL_RACTIVE              0x00000010      /* rthread running */
  79 #define MC_JOURNAL_WWAIT                0x00000040      /* write stall */
  80 #define MC_JOURNAL_WANT_AUDIT           0x00010000      /* audit trail */
  81 #define MC_JOURNAL_WANT_REVERSABLE      0x00020000      /* reversable stream */
  82 #define MC_JOURNAL_WANT_FULLDUPLEX      0x00040000      /* has ack stream */
  83
  84 struct mountctl_restart_journal {
  85         char    id[JIDMAX];
  86         int     flags;
  87         int     unused01;
  88 };
  89
  90 struct mountctl_remove_journal {
  91         char    id[JIDMAX];
  92         int     flags;
  93 };
  94
  95 #define MC_JOURNAL_REMOVE_TRASH         0x00000001      /* data -> trash */
  96 #define MC_JOURNAL_REMOVE_ASSYNC        0x00000002      /* asynchronous op */
  97
  98 struct mountctl_status_journal {
  99         char    id[JIDMAX];
 100         int     index;
 101 };
 102
 103 #define MC_JOURNAL_INDEX_ALL            -2
 104 #define MC_JOURNAL_INDEX_ID             -1
 105
 106 struct mountctl_journal_ret_status {
 107         int     recsize;
 108         char    id[JIDMAX];
 109         int     index;
 110         int     flags;
 111         int64_t membufsize;
 112         int64_t membufused;
 113         int64_t membufunacked;
 114         int64_t swapbufsize;
 115         int64_t swapbufused;
 116         int64_t swapbufunacked;
 117         int64_t transidstart;
 118         int64_t transidcurrent;
 119         int64_t transidunacked;
 120         int64_t transidacked;
 121         int64_t bytessent;
 122         int64_t bytesacked;
 123         int64_t fifostalls;
 124         int64_t reserved[4];
 125         struct timeval lastack;
 126 };
 127
 128 #define MC_JOURNAL_STATUS_MORETOCOME    0x00000001
 129
 130 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
 131
 132 /*
 133  * Support structures for the generic journaling structure
 134  */
 135 struct journal_memfifo {
 136         int     size;           /* size (power of two) */
 137         int     mask;           /* index mask (size - 1) */
 138         int     rindex;         /* stream reader index (track fd writes) */
 139         int     xindex;         /* last acked / reader restart */
 140         int     windex;         /* stream writer index */
 141         char    *membase;       /* memory buffer representing the FIFO */
 142 };
 143
 144 /*
 145  * Generic journaling structure attached to a mount point.
 146  */
 147 struct journal {
 148         TAILQ_ENTRY(journal) jentry;
 149         struct file     *fp;
 150         char            id[JIDMAX];
 151         int             flags;          /* journaling flags */
 152         int64_t         transid;
 153         int64_t         total_acked;
 154         int64_t         fifostalls;
 155         struct journal_memfifo fifo;
 156         struct thread   wthread;
 157         struct thread   rthread;
 158 };
 159
 160
 161 /*
 162  * The jrecord structure is used to build a journaling transaction.  Since
 163  * a single journaling transaction might encompass very large buffers it
 164  * is possible for multiple transactions to be written out to the FIFO
 165  * in parallel and in peacemeal.
 166  */
 167 struct jrecord {
 168         struct journal  *jo;
 169         char            *stream_ptr;
 170         int             stream_residual;
 171         int             stream_reserved;
 172         struct journal_rawrecbeg *rawp;
 173         struct journal_subrecord *parent;
 174         struct journal_subrecord *last;
 175         int16_t         streamid;
 176         int             pushcount;
 177         int             pushptrgood;
 178         int             residual;
 179         int             residual_align;
 180
 181         /*
 182          * These fields are not used by the jrecord routines.  They may
 183          * be used by higher level routines to manage multiple jrecords.
 184          * See the jreclist_*() functions.
 185          */
 186         TAILQ_ENTRY(jrecord) user_entry;
 187         void *user_save;
 188 };
 189
 190 TAILQ_HEAD(jrecord_list, jrecord);
 191
 192 #endif
 193 #endif