src/loggen.c

   1 /*
   2  * Copyright (c) 2000-2003 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18
  19 /*
  20  *
  21  * loggen: Generate log entries. Very much incomplete. The empty log
  22  *         record is a bit of a misnomer since we need to jump through
  23  *         hoops to get a log record that parses ok yet does nothing.
  24  *
  25  *                                                  - dxm 29/09/00
  26  */
  27
  28 #include <xfs/libxfs.h>
  29 #include <xfs/xfs_log.h>
  30 #include <xfs/xfs_log_priv.h>
  31
  32 #ifndef ASSIGN_ANY_LSN_DISK
  33 #define ASSIGN_ANY_LSN_DISK(lsn,cycle,block)  \
  34     { \
  35         INT_SET(((uint *)&(lsn))[0], ARCH_CONVERT, (cycle)); \
  36         INT_SET(((uint *)&(lsn))[1], ARCH_CONVERT, (block)); \
  37     }
  38 #endif
  39
  40 void
  41 usage(void)
  42 {
  43     fprintf(stderr,"Usage: loggen\n"
  44                    "           set up parameters before writing record(s):\n"
  45                    "               -f f     - set format\n"
  46                    "               -u u     - set uuid\n"
  47                    "               -c c     - set cycle\n"
  48                    "               -b b     - set block\n"
  49                    "               -C c     - set tail cycle\n"
  50                    "               -B b     - set tail block\n"
  51                    "           write log record(s):\n"
  52                    "               -z n     - write n zero block(s)     (1BB)\n"
  53                    "               -e n     - write n empty record(s)   (2BB)\n"
  54                    "               -m n     - write n unmount record(s) (2BB)\n"
  55                    "\n"
  56                    "            redirect stdout to external log partition, or pipe to\n"
  57                    "            dd with appropriate parameters to stuff into internal log.\n"
  58     );
  59     exit(1);
  60 }
  61
  62 int         bufblocks            = 0;
  63 void        *buf                 = NULL;
  64 int         param_cycle          = 1;
  65 int         param_block          = 0;
  66 int         param_tail_cycle     = 1;
  67 int         param_tail_block     = 0;
  68 int         param_fmt            = XLOG_FMT;
  69 uuid_t      param_uuid           = {0};
  70
  71 void
  72 loggen_alloc(int blocks)
  73 {
  74     if (!(buf=realloc(buf, blocks*BBSIZE))) {
  75         fprintf(stderr,"failed to allocate %d block(s)\n", blocks);
  76         exit(1);
  77     }
  78     memset(buf, 0, blocks*BBSIZE);
  79     bufblocks=blocks;
  80 }
  81
  82 void
  83 loggen_write(void)
  84 {
  85     if (!buf) {
  86         fprintf(stderr,"no buffer allocated\n");
  87         exit(1);
  88     }
  89
  90     if (fwrite(buf, BBSIZE, bufblocks, stdout) != bufblocks) {
  91         perror("fwrite");
  92         exit(1);
  93     }
  94
  95 }
  96
  97 void
  98 loggen_zero(int count)
  99 {
 100     if (!count) count=1;
 101
 102     fprintf(stderr,"   *** zero block (1BB) x %d\n", count);
 103     loggen_alloc(1);
 104     while (count--)
 105         loggen_write();
 106 }
 107
 108 void
 109 loggen_unmount(int count)
 110 {
 111     xlog_rec_header_t       *head;
 112     xlog_op_header_t        *op;
 113     /* the data section must be 32 bit size aligned */
 114     struct {
 115         __uint16_t magic;
 116         __uint16_t pad1;
 117         __uint32_t pad2; /* may as well make it 64 bits */
 118     } magic = { XLOG_UNMOUNT_TYPE, 0, 0 };
 119
 120     if (!count) count=1;
 121
 122     fprintf(stderr,"   *** unmount record (2BB) x %d\n", count);
 123     loggen_alloc(2);
 124
 125     head = (xlog_rec_header_t *)buf;
 126     op   = (xlog_op_header_t  *)(((char*)buf)+BBSIZE);
 127
 128     /* note that oh_tid actually contains the cycle number
 129      * and the tid is stored in h_cycle_data[0] - that's the
 130      * way things end up on disk.
 131      */
 132
 133     head->h_magicno = cpu_to_be32(XLOG_HEADER_MAGIC_NUM);
 134     head->h_cycle = cpu_to_be32(param_cycle);
 135     head->h_version = cpu_to_be32(1);
 136     head->h_len = cpu_to_be32(20);
 137     head->h_chksum = cpu_to_be32(0);
 138     head->h_prev_block = cpu_to_be32(-1);
 139     head->h_num_logops = cpu_to_be32(1);
 140     head->h_cycle_data[0] = cpu_to_be32(0xb0c0d0d0);
 141     head->h_fmt = cpu_to_be32(param_fmt);
 142
 143     head->h_tail_lsn = cpu_to_be64(xlog_assign_lsn(param_tail_cycle,
 144                                                         param_tail_block));
 145
 146     memcpy(head->h_fs_uuid,  param_uuid, sizeof(uuid_t));
 147
 148     /* now a log unmount op */
 149     op->oh_tid = cpu_to_be32(param_cycle);
 150     op->oh_len = cpu_to_be32(sizeof(magic));
 151     op->oh_clientid = XFS_LOG;
 152     op->oh_flags = XLOG_UNMOUNT_TRANS;
 153     op->oh_res2 = cpu_to_be16(0);
 154
 155     /* and the data for this op */
 156
 157     memcpy(op+1, &magic, sizeof(magic));
 158
 159     while (count--) {
 160         head->h_lsn = cpu_to_be64(xlog_assign_lsn(param_cycle, param_block++));
 161
 162         loggen_write();
 163     }
 164 }
 165
 166 void
 167 loggen_empty(int count)
 168 {
 169     xlog_rec_header_t       *head;
 170     xlog_op_header_t        *op1, *op2, *op3, *op4, *op5;
 171     xfs_trans_header_t      *trans;
 172     xfs_buf_log_format_t    blfs;
 173     xfs_buf_log_format_t    *blf;
 174     int                     *data;
 175     char                    *p;
 176
 177     if (!count) count=1;
 178
 179     fprintf(stderr,"   *** empty record (2BB) x %d\n", count);
 180     loggen_alloc(2);
 181
 182     p=(char*)buf;
 183     head  = (xlog_rec_header_t   *)p;         p+=BBSIZE;
 184     op1   = (xlog_op_header_t    *)p;         p+=sizeof(xlog_op_header_t);
 185     op2   = (xlog_op_header_t    *)p;         p+=sizeof(xlog_op_header_t);
 186     trans = (xfs_trans_header_t  *)p;         p+=sizeof(xfs_trans_header_t);
 187     op3   = (xlog_op_header_t    *)p;         p+=sizeof(xlog_op_header_t);
 188     blf   = (xfs_buf_log_format_t*)p;         p+=sizeof(xfs_buf_log_format_t);
 189     op4   = (xlog_op_header_t    *)p;         p+=sizeof(xlog_op_header_t);
 190     data  = (int                 *)p;         p+=sizeof(int);
 191     op5   = (xlog_op_header_t    *)p;         p+=sizeof(xlog_op_header_t);
 192
 193     /* note that oh_tid actually contains the cycle number
 194      * and the tid is stored in h_cycle_data[0] - that's the
 195      * way things end up on disk.
 196      */
 197
 198     head->h_magicno        = cpu_to_be32(XLOG_HEADER_MAGIC_NUM);
 199     head->h_cycle          = cpu_to_be32(param_cycle);
 200     head->h_version        = cpu_to_be32(1);
 201     head->h_len            = cpu_to_be32(5*sizeof(xlog_op_header_t) +
 202                                                     sizeof(xfs_trans_header_t)+
 203                                                     sizeof(xfs_buf_log_format_t)+
 204                                                     sizeof(int));
 205     head->h_chksum         = cpu_to_be32(0);
 206     head->h_prev_block     = cpu_to_be32(-1);
 207     head->h_num_logops     = cpu_to_be32(5);
 208     head->h_cycle_data[0]  = cpu_to_be32(0xb0c0d0d0);
 209     head->h_fmt            = cpu_to_be32(param_fmt);
 210
 211     head->h_tail_lsn = cpu_to_be64(xlog_assign_lsn(param_tail_cycle,
 212                                                         param_tail_block));
 213
 214     memcpy(head->h_fs_uuid, param_uuid, sizeof(uuid_t));
 215
 216     /* start */
 217     op1->oh_tid            = cpu_to_be32(1);
 218     op1->oh_len            = cpu_to_be32(0);
 219     op1->oh_clientid       = XFS_TRANSACTION;
 220     op1->oh_flags          = XLOG_START_TRANS;
 221     op1->oh_res2           = cpu_to_be16(0);
 222     /* dummy */
 223     op2->oh_tid            = cpu_to_be32(0xb0c0d0d0);
 224     op2->oh_len            = cpu_to_be32(sizeof(xfs_trans_header_t));
 225     op2->oh_clientid       = XFS_TRANSACTION;
 226     op2->oh_flags          = 0;
 227     op2->oh_res2           = cpu_to_be16(0);
 228     /* dummy transaction - this stuff doesn't get endian converted */
 229     trans->th_magic     = XFS_TRANS_MAGIC;
 230     trans->th_type      = XFS_TRANS_DUMMY1;
 231     trans->th_tid       = 0;
 232     trans->th_num_items = 1;
 233     /* buffer */
 234     op3->oh_tid            = cpu_to_be32(0xb0c0d0d0);
 235     op3->oh_len            = cpu_to_be32(sizeof(xfs_buf_log_format_t));
 236     op3->oh_clientid       = XFS_TRANSACTION;
 237     op3->oh_flags          = 0;
 238     op3->oh_res2           = cpu_to_be16(0);
 239     /* an empty buffer too */
 240     blfs.blf_type       = XFS_LI_BUF;
 241     blfs.blf_size       = 2;
 242     blfs.blf_flags      = XFS_BLI_CANCEL;
 243     blfs.blf_blkno      = 1;
 244     blfs.blf_map_size   = 1;
 245     blfs.blf_data_map[0]= 0;
 246     memcpy(blf, &blfs, sizeof(blfs));
 247     /* commit */
 248     op4->oh_tid            = cpu_to_be32(0xb0c0d0d0);
 249     op4->oh_len            = cpu_to_be32(sizeof(int));
 250     op4->oh_clientid       = XFS_TRANSACTION;
 251     op4->oh_flags          = 0;
 252     op4->oh_res2           = cpu_to_be16(0);
 253     /* and the data */
 254     *data=*(int*)(char*)"FISH"; /* this won't get written (I hope) */
 255     /* commit */
 256     op5->oh_tid            = cpu_to_be32(0xb0c0d0d0);
 257     op5->oh_len            = cpu_to_be32(0);
 258     op5->oh_clientid       = XFS_TRANSACTION;
 259     op5->oh_flags          = XLOG_COMMIT_TRANS;
 260     op5->oh_res2           = cpu_to_be16(0);
 261
 262     while (count--) {
 263         head->h_lsn = cpu_to_be64(xlog_assign_lsn(param_cycle, param_block++));
 264
 265         loggen_write();
 266     }
 267 }
 268
 269 int
 270 main(int argc, char *argv[])
 271 {
 272     int c;
 273
 274     fprintf(stderr,"*** loggen\n");
 275
 276     if (argc<2) usage();
 277
 278     while ((c = getopt(argc, argv, "f:u:c:b:C:B:z:e:m:")) != -1) {
 279         switch (c) {
 280             case 'f':
 281                 param_fmt=atoi(optarg);
 282                 break;
 283             case 'u':
 284                 memset(param_uuid, atoi(optarg), sizeof(param_uuid));
 285                 break;
 286             case 'c':
 287                 param_cycle=atoi(optarg);
 288                 break;
 289             case 'b':
 290                 param_block=atoi(optarg);
 291                 break;
 292             case 'C':
 293                 param_tail_cycle=atoi(optarg);
 294                 break;
 295             case 'B':
 296                 param_tail_block=atoi(optarg);
 297                 break;
 298
 299             case 'z':
 300                 loggen_zero(atoi(optarg));
 301                 break;
 302             case 'e':
 303                 loggen_empty(atoi(optarg));
 304                 break;
 305             case 'm':
 306                 loggen_unmount(atoi(optarg));
 307                 break;
 308
 309             default:
 310                 fprintf(stderr, "unknown option\n");
 311                 usage();
 312         }
 313     }
 314     return 0;
 315 }