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 1.15 2008/06/01 19:27:37 dillon Exp $
  35  */
  36
  37 #ifndef _SYS_MOUNTCTL_H_
  38 #define _SYS_MOUNTCTL_H_
  39
  40 #ifndef _SYS_TYPES_H_
  41 #include <sys/types.h>
  42 #endif
  43 #ifndef _SYS_TIME_H_
  44 #include <sys/time.h>
  45 #endif
  46 #ifndef _SYS_QUEUE_H_
  47 #include <sys/queue.h>
  48 #endif
  49
  50 #ifdef _KERNEL
  51
  52 #ifndef _SYS_THREAD_H_
  53 #include <sys/thread.h>
  54 #endif
  55 #ifndef _SYS_MALLOC_H_
  56 #include <sys/malloc.h>
  57 #endif
  58
  59 #endif
  60
  61 /*
  62  * General constants
  63  */
  64
  65 #define JIDMAX          32      /* id string buf[] size (incls \0) */
  66
  67 #define MOUNTCTL_INSTALL_VFS_JOURNAL    1
  68 #define MOUNTCTL_REMOVE_VFS_JOURNAL     2
  69 #define MOUNTCTL_RESYNC_VFS_JOURNAL     3
  70 #define MOUNTCTL_STATUS_VFS_JOURNAL     4
  71 #define MOUNTCTL_RESTART_VFS_JOURNAL    5
  72
  73 #define MOUNTCTL_INSTALL_BLK_JOURNAL    8
  74 #define MOUNTCTL_REMOVE_BLK_JOURNAL     9
  75 #define MOUNTCTL_RESYNC_BLK_JOURNAL     10
  76 #define MOUNTCTL_STATUS_BLK_JOURNAL     11
  77
  78 #define MOUNTCTL_SET_EXPORT             16      /* sys/mount.h:export_args */
  79 #define MOUNTCTL_STATVFS                17      /* get extended stats */
  80 #define MOUNTCTL_MOUNTFLAGS             18      /* extract mountflags */
  81
  82 /*
  83  * Data structures for the journaling API
  84  */
  85
  86 struct mountctl_install_journal {
  87         char    id[JIDMAX];
  88         int     flags;          /* journaling flags */
  89         int     unused01;
  90         int64_t membufsize;     /* backing store */
  91         int64_t swapbufsize;    /* backing store */
  92         int64_t transid;        /* starting with specified transaction id */
  93         int64_t unused02;
  94         int     stallwarn;      /* stall warning (seconds) */
  95         int     stallerror;     /* stall error (seconds) */
  96         int     unused03;
  97         int     unused04;
  98 };
  99
 100 #define MC_JOURNAL_UNUSED0001           0x00000001
 101 #define MC_JOURNAL_STOP_REQ             0x00000002      /* stop request pend */
 102 #define MC_JOURNAL_STOP_IMM             0x00000004      /* STOP+trash fifo */
 103 #define MC_JOURNAL_WACTIVE              0x00000008      /* wthread running */
 104 #define MC_JOURNAL_RACTIVE              0x00000010      /* rthread running */
 105 #define MC_JOURNAL_WWAIT                0x00000040      /* write stall */
 106 #define MC_JOURNAL_WANT_AUDIT           0x00010000      /* audit trail */
 107 #define MC_JOURNAL_WANT_REVERSABLE      0x00020000      /* reversable stream */
 108 #define MC_JOURNAL_WANT_FULLDUPLEX      0x00040000      /* has ack stream */
 109
 110 struct mountctl_restart_journal {
 111         char    id[JIDMAX];
 112         int     flags;
 113         int     unused01;
 114 };
 115
 116 struct mountctl_remove_journal {
 117         char    id[JIDMAX];
 118         int     flags;
 119 };
 120
 121 #define MC_JOURNAL_REMOVE_TRASH         0x00000001      /* data -> trash */
 122 #define MC_JOURNAL_REMOVE_ASSYNC        0x00000002      /* asynchronous op */
 123
 124 struct mountctl_status_journal {
 125         char    id[JIDMAX];
 126         int     index;
 127 };
 128
 129 #define MC_JOURNAL_INDEX_ALL            -2
 130 #define MC_JOURNAL_INDEX_ID             -1
 131
 132 struct mountctl_journal_ret_status {
 133         int     recsize;
 134         char    id[JIDMAX];
 135         int     index;
 136         int     flags;
 137         int64_t membufsize;
 138         int64_t membufused;
 139         int64_t membufunacked;
 140         int64_t swapbufsize;
 141         int64_t swapbufused;
 142         int64_t swapbufunacked;
 143         int64_t transidstart;
 144         int64_t transidcurrent;
 145         int64_t transidunacked;
 146         int64_t transidacked;
 147         int64_t bytessent;
 148         int64_t bytesacked;
 149         int64_t fifostalls;
 150         int64_t reserved[4];
 151         struct timeval lastack;
 152 };
 153
 154 #define MC_JOURNAL_STATUS_MORETOCOME    0x00000001
 155
 156 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
 157
 158 /*
 159  * Support structures for the generic journaling structure
 160  */
 161 struct journal_memfifo {
 162         int     size;           /* size (power of two) */
 163         int     mask;           /* index mask (size - 1) */
 164         int     rindex;         /* stream reader index (track fd writes) */
 165         int     xindex;         /* last acked / reader restart */
 166         int     windex;         /* stream writer index */
 167         char    *membase;       /* memory buffer representing the FIFO */
 168 };
 169
 170 /*
 171  * Generic journaling structure attached to a mount point.
 172  */
 173 struct journal {
 174         TAILQ_ENTRY(journal) jentry;
 175         struct file     *fp;
 176         char            id[JIDMAX];
 177         int             flags;          /* journaling flags */
 178         int64_t         transid;
 179         int64_t         total_acked;
 180         int64_t         fifostalls;
 181         struct journal_memfifo fifo;
 182         struct thread   wthread;
 183         struct thread   rthread;
 184 };
 185
 186
 187 /*
 188  * The jrecord structure is used to build a journaling transaction.  Since
 189  * a single journaling transaction might encompass very large buffers it
 190  * is possible for multiple transactions to be written out to the FIFO
 191  * in parallel and in peacemeal.
 192  */
 193 struct jrecord {
 194         struct journal  *jo;
 195         char            *stream_ptr;
 196         int             stream_residual;
 197         int             stream_reserved;
 198         struct journal_rawrecbeg *rawp;
 199         struct journal_subrecord *parent;
 200         struct journal_subrecord *last;
 201         int16_t         streamid;
 202         int             pushcount;
 203         int             pushptrgood;
 204         int             residual;
 205         int             residual_align;
 206
 207         /*
 208          * These fields are not used by the jrecord routines.  They may
 209          * be used by higher level routines to manage multiple jrecords.
 210          * See the jreclist_*() functions.
 211          */
 212         TAILQ_ENTRY(jrecord) user_entry;
 213         void *user_save;
 214 };
 215
 216 struct jrecord_list {
 217         TAILQ_HEAD(, jrecord) list;
 218         int16_t         streamid;
 219 };
 220
 221 #endif  /* kernel or kernel structures */
 222
 223 #if defined(_KERNEL)
 224
 225 struct namecache;
 226 struct ucred;
 227 struct uio;
 228 struct vnode;
 229 struct vattr;
 230 struct vm_page;
 231
 232 void journal_create_threads(struct journal *jo);
 233 void journal_destroy_threads(struct journal *jo, int flags);
 234
 235 /*
 236  * Primary journal record support procedures
 237  */
 238 void jrecord_init(struct journal *jo,
 239                         struct jrecord *jrec, int16_t streamid);
 240 struct journal_subrecord *jrecord_push(
 241                         struct jrecord *jrec, int16_t rectype);
 242 void jrecord_pop(struct jrecord *jrec, struct journal_subrecord *parent);
 243 void jrecord_leaf(struct jrecord *jrec,
 244                          int16_t rectype, void *ptr, int bytes);
 245 struct journal_subrecord *jrecord_write(struct jrecord *jrec,
 246                         int16_t rectype, int bytes);
 247 void jrecord_data(struct jrecord *jrec, const void *buf, int bytes);
 248 void jrecord_done(struct jrecord *jrec, int abortit);
 249
 250 /*
 251  * Rollup journal record support procedures
 252  */
 253 void jrecord_write_path(struct jrecord *jrec,
 254                         int16_t rectype, struct namecache *ncp);
 255 void jrecord_write_vattr(struct jrecord *jrec, struct vattr *vat);
 256 void jrecord_write_cred(struct jrecord *jrec, struct thread *td,
 257                         struct ucred *cred);
 258 void jrecord_write_vnode_ref(struct jrecord *jrec, struct vnode *vp);
 259 void jrecord_write_vnode_link(struct jrecord *jrec, struct vnode *vp,
 260                         struct namecache *notncp);
 261 void jrecord_write_pagelist(struct jrecord *jrec, int16_t rectype,
 262                         struct vm_page **pglist, int *rtvals, int pgcount,
 263                         off_t offset);
 264 void jrecord_write_uio(struct jrecord *jrec, int16_t rectype, struct uio *uio);
 265 void jrecord_file_data(struct jrecord *jrec, struct vnode *vp,
 266                         off_t off, off_t bytes);
 267
 268 MALLOC_DECLARE(M_JOURNAL);
 269 MALLOC_DECLARE(M_JFIFO);
 270
 271 #else
 272
 273 #include <sys/cdefs.h>
 274
 275 __BEGIN_DECLS
 276 int     mountctl (const char *path, int op, int fd, void *ctl, int ctllen,
 277                   void *buf, int buflen);
 278 __END_DECLS
 279
 280 #endif  /* kernel */
 281
 282 #endif  /* header */