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