sys/dev/disk/dm/dm_ioctl.c

   1 /* $NetBSD: dm_ioctl.c,v 1.21 2010/02/25 20:48:58 jakllsch Exp $      */
   2
   3 /*
   4  * Copyright (c) 2008 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Adam Hamsik.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 /*
  33  * Locking is used to synchronise between ioctl calls and between dm_table's
  34  * users.
  35  *
  36  * ioctl locking:
  37  * Simple reference counting, to count users of device will be used routines
  38  * dm_dev_busy/dm_dev_unbusy are used for that.
  39  * dm_dev_lookup/dm_dev_rem call dm_dev_busy before return(caller is therefore
  40  * holder of reference_counter last).
  41  *
  42  * ioctl routines which change/remove dm_dev parameters must wait on
  43  * dm_dev::dev_cv and when last user will call dm_dev_unbusy they will wake
  44  * up them.
  45  *
  46  * table_head locking:
  47  * To access table entries dm_table_* routines must be used.
  48  *
  49  * dm_table_get_entry will increment table users reference
  50  * counter. It will return active or inactive table depends
  51  * on uint8_t argument.
  52  *
  53  * dm_table_release must be called for every table_entry from
  54  * dm_table_get_entry. Between these to calls tables can'tbe switched
  55  * or destroyed.
  56  *
  57  * dm_table_head_init initialize talbe_entries SLISTS and io_cv.
  58  *
  59  * dm_table_head_destroy destroy cv.
  60  *
  61  * There are two types of users for dm_table_head first type will
  62  * only read list and try to do anything with it e.g. dmstrategy,
  63  * dm_table_size etc. There is another user for table_head which wants
  64  * to change table lists e.g. dm_dev_resume_ioctl, dm_dev_remove_ioctl,
  65  * dm_table_clear_ioctl.
  66  *
  67  * NOTE: It is not allowed to call dm_table_destroy, dm_table_switch_tables
  68  *       with hold table reference counter. Table reference counter is hold
  69  *       after calling dm_table_get_entry routine. After calling this
  70  *       function user must call dm_table_release before any writer table
  71  *       operation.
  72  *
  73  * Example: dm_table_get_entry
  74  *          dm_table_destroy/dm_table_switch_tables
  75  * This exaple will lead to deadlock situation because after dm_table_get_entry
  76  * table reference counter is != 0 and dm_table_destroy have to wait on cv until
  77  * reference counter is 0.
  78  *
  79  */
  80
  81 #include <sys/types.h>
  82 #include <sys/param.h>
  83 #include <sys/device.h>
  84 #include <sys/malloc.h>
  85 #include <sys/vnode.h>
  86 #include <dev/disk/dm/dm.h>
  87
  88 #include "netbsd-dm.h"
  89
  90 #define DM_REMOVE_FLAG(flag, name) do {                                 \
  91                 prop_dictionary_get_uint32(dm_dict,DM_IOCTL_FLAGS,&flag); \
  92                 flag &= ~name;                                          \
  93                 prop_dictionary_set_uint32(dm_dict,DM_IOCTL_FLAGS,flag); \
  94 } while (/*CONSTCOND*/0)
  95
  96 #define DM_ADD_FLAG(flag, name) do {                                    \
  97                 prop_dictionary_get_uint32(dm_dict,DM_IOCTL_FLAGS,&flag); \
  98                 flag |= name;                                           \
  99                 prop_dictionary_set_uint32(dm_dict,DM_IOCTL_FLAGS,flag); \
 100 } while (/*CONSTCOND*/0)
 101
 102 static int dm_dbg_print_flags(int);
 103
 104 /*
 105  * Print flags sent to the kernel from libevmapper.
 106  */
 107 static int
 108 dm_dbg_print_flags(int flags)
 109 {
 110         aprint_debug("dbg_print --- %d\n", flags);
 111
 112         if (flags & DM_READONLY_FLAG)
 113                 aprint_debug("dbg_flags: DM_READONLY_FLAG set In/Out\n");
 114
 115         if (flags & DM_SUSPEND_FLAG)
 116                 aprint_debug("dbg_flags: DM_SUSPEND_FLAG set In/Out \n");
 117
 118         if (flags & DM_PERSISTENT_DEV_FLAG)
 119                 aprint_debug("db_flags: DM_PERSISTENT_DEV_FLAG set In\n");
 120
 121         if (flags & DM_STATUS_TABLE_FLAG)
 122                 aprint_debug("dbg_flags: DM_STATUS_TABLE_FLAG set In\n");
 123
 124         if (flags & DM_ACTIVE_PRESENT_FLAG)
 125                 aprint_debug("dbg_flags: DM_ACTIVE_PRESENT_FLAG set Out\n");
 126
 127         if (flags & DM_INACTIVE_PRESENT_FLAG)
 128                 aprint_debug("dbg_flags: DM_INACTIVE_PRESENT_FLAG set Out\n");
 129
 130         if (flags & DM_BUFFER_FULL_FLAG)
 131                 aprint_debug("dbg_flags: DM_BUFFER_FULL_FLAG set Out\n");
 132
 133         if (flags & DM_SKIP_BDGET_FLAG)
 134                 aprint_debug("dbg_flags: DM_SKIP_BDGET_FLAG set In\n");
 135
 136         if (flags & DM_SKIP_LOCKFS_FLAG)
 137                 aprint_debug("dbg_flags: DM_SKIP_LOCKFS_FLAG set In\n");
 138
 139         if (flags & DM_NOFLUSH_FLAG)
 140                 aprint_debug("dbg_flags: DM_NOFLUSH_FLAG set In\n");
 141
 142         return 0;
 143 }
 144 /*
 145  * Get version ioctl call I do it as default therefore this
 146  * function is unused now.
 147  */
 148 int
 149 dm_get_version_ioctl(prop_dictionary_t dm_dict)
 150 {
 151         return 0;
 152 }
 153 /*
 154  * Get list of all available targets from global
 155  * target list and sent them back to libdevmapper.
 156  */
 157 int
 158 dm_list_versions_ioctl(prop_dictionary_t dm_dict)
 159 {
 160         prop_array_t target_list;
 161         uint32_t flags;
 162
 163         flags = 0;
 164
 165         prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags);
 166
 167         dm_dbg_print_flags(flags);
 168         target_list = dm_target_prop_list();
 169
 170         prop_dictionary_set(dm_dict, DM_IOCTL_CMD_DATA, target_list);
 171         prop_object_release(target_list);
 172
 173         return 0;
 174 }
 175 /*
 176  * Create in-kernel entry for device. Device attributes such as name, uuid are
 177  * taken from proplib dictionary.
 178  *
 179  */
 180 int
 181 dm_dev_create_ioctl(prop_dictionary_t dm_dict)
 182 {
 183         dm_dev_t *dmv;
 184         const char *name, *uuid;
 185         int r, flags;
 186
 187         r = 0;
 188         flags = 0;
 189         name = NULL;
 190         uuid = NULL;
 191
 192         /* Get needed values from dictionary. */
 193         prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name);
 194         prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid);
 195         prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags);
 196
 197         dm_dbg_print_flags(flags);
 198
 199         /* Lookup name and uuid if device already exist quit. */
 200         if ((dmv = dm_dev_lookup(name, uuid, -1)) != NULL) {
 201                 DM_ADD_FLAG(flags, DM_EXISTS_FLAG);     /* Device already exists */
 202                 dm_dev_unbusy(dmv);
 203                 return EEXIST;
 204         }
 205
 206         r = dm_dev_create(&dmv, name, uuid, flags);
 207
 208         if (r == 0) {
 209                 prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor);
 210                 DM_ADD_FLAG(flags, DM_EXISTS_FLAG);
 211                 DM_REMOVE_FLAG(flags, DM_INACTIVE_PRESENT_FLAG);
 212         }
 213
 214         return r;
 215 }
 216 /*
 217  * Get list of created device-mapper devices fromglobal list and
 218  * send it to kernel.
 219  *
 220  * Output dictionary:
 221  *
 222  * <key>cmd_data</key>
 223  *  <array>
 224  *   <dict>
 225  *    <key>name<key>
 226  *    <string>...</string>
 227  *
 228  *    <key>dev</key>
 229  *    <integer>...</integer>
 230  *   </dict>
 231  *  </array>
 232  *
 233  */
 234 int
 235 dm_dev_list_ioctl(prop_dictionary_t dm_dict)
 236 {
 237         prop_array_t dev_list;
 238
 239         uint32_t flags;
 240
 241         flags = 0;
 242
 243         prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags);
 244
 245         dm_dbg_print_flags(flags);
 246
 247         dev_list = dm_dev_prop_list();
 248
 249         prop_dictionary_set(dm_dict, DM_IOCTL_CMD_DATA, dev_list);
 250         prop_object_release(dev_list);
 251
 252         return 0;
 253 }
 254 /*
 255  * Rename selected devices old name is in struct dm_ioctl.
 256  * newname is taken from dictionary
 257  *
 258  * <key>cmd_data</key>
 259  *  <array>
 260  *   <string>...</string>
 261  *  </array>
 262  */
 263 int
 264 dm_dev_rename_ioctl(prop_dictionary_t dm_dict)
 265 {
 266 #if 0
 267         prop_array_t cmd_array;
 268         dm_dev_t *dmv;
 269
 270         const char *name, *uuid, *n_name;
 271         uint32_t flags, minor;
 272
 273         name = NULL;
 274         uuid = NULL;
 275         minor = 0;
 276
 277         /* Get needed values from dictionary. */
 278         prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name);
 279         prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid);
 280         prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags);
 281         prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor);
 282
 283         dm_dbg_print_flags(flags);
 284
 285         cmd_array = prop_dictionary_get(dm_dict, DM_IOCTL_CMD_DATA);
 286
 287         prop_array_get_cstring_nocopy(cmd_array, 0, &n_name);
 288
 289         if (strlen(n_name) + 1 > DM_NAME_LEN)
 290                 return EINVAL;
 291
 292         if ((dmv = dm_dev_rem(NULL, name, uuid, minor)) == NULL) {
 293                 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG);
 294                 return ENOENT;
 295         }
 296         /* change device name */
 297         /*
 298          * XXX How to deal with this change, name only used in
 299          * dm_dev_routines, should I add dm_dev_change_name which will run
 300          * under the dm_dev_list mutex ?
 301          */
 302         strlcpy(dmv->name, n_name, DM_NAME_LEN);
 303
 304         prop_dictionary_set_uint32(dm_dict, DM_IOCTL_OPEN, dmv->table_head.io_cnt);
 305         prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor);
 306         prop_dictionary_set_cstring(dm_dict, DM_IOCTL_UUID, dmv->uuid);
 307
 308         dm_dev_insert(dmv);
 309 #endif
 310
 311         /*
 312          * XXX: the rename is not yet implemented. The main complication
 313          *      here is devfs. We'd probably need a new function, rename_dev()
 314          *      that would trigger a node rename in devfs.
 315          */
 316         kprintf("dm_dev_rename_ioctl called, but not implemented!\n");
 317         return 0;
 318 }
 319
 320 /*
 321  * Remove device
 322  */
 323 int
 324 dm_dev_remove_ioctl(prop_dictionary_t dm_dict)
 325 {
 326         dm_dev_t *dmv;
 327         const char *name, *uuid;
 328         uint32_t flags, minor, is_open;
 329
 330         flags = 0;
 331         name = NULL;
 332         uuid = NULL;
 333
 334         /* Get needed values from dictionary. */
 335         prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name);
 336         prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid);
 337         prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags);
 338         prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor);
 339
 340         dm_dbg_print_flags(flags);
 341
 342         if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) {
 343                 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG);
 344                 return ENOENT;
 345         }
 346
 347         is_open = dmv->is_open;
 348
 349         dm_dev_unbusy(dmv);
 350
 351         if (is_open)
 352                 return EBUSY;
 353
 354         /*
 355          * This will call dm_detach routine which will actually remove
 356          * device.
 357          */
 358         return dm_dev_remove(dmv);
 359 }
 360
 361 /*
 362  * Try to remove all devices
 363  */
 364 int
 365 dm_dev_remove_all_ioctl(prop_dictionary_t dm_dict)
 366 {
 367         uint32_t flags = 0;
 368
 369         /* Get needed values from dictionary. */
 370         prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags);
 371
 372         dm_dbg_print_flags(flags);
 373
 374         /* Gently remove all devices, if possible */
 375         return dm_dev_remove_all(1);
 376 }
 377
 378 /*
 379  * Return actual state of device to libdevmapper.
 380  */
 381 int
 382 dm_dev_status_ioctl(prop_dictionary_t dm_dict)
 383 {
 384         dm_dev_t *dmv;
 385         const char *name, *uuid;
 386         uint32_t flags, j, minor;
 387
 388         name = NULL;
 389         uuid = NULL;
 390         flags = 0;
 391         j = 0;
 392
 393         prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name);
 394         prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid);
 395         prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags);
 396         prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor);
 397
 398         if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) {
 399                 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG);
 400                 return ENOENT;
 401         }
 402         dm_dbg_print_flags(dmv->flags);
 403
 404         prop_dictionary_set_uint32(dm_dict, DM_IOCTL_OPEN, dmv->table_head.io_cnt);
 405         prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor);
 406         prop_dictionary_set_cstring(dm_dict, DM_IOCTL_UUID, dmv->uuid);
 407
 408         if (dmv->flags & DM_SUSPEND_FLAG)
 409                 DM_ADD_FLAG(flags, DM_SUSPEND_FLAG);
 410
 411         /*
 412          * Add status flags for tables I have to check both active and
 413          * inactive tables.
 414          */
 415         if ((j = dm_table_get_target_count(&dmv->table_head, DM_TABLE_ACTIVE))) {
 416                 DM_ADD_FLAG(flags, DM_ACTIVE_PRESENT_FLAG);
 417         } else
 418                 DM_REMOVE_FLAG(flags, DM_ACTIVE_PRESENT_FLAG);
 419
 420         prop_dictionary_set_uint32(dm_dict, DM_IOCTL_TARGET_COUNT, j);
 421
 422         if (dm_table_get_target_count(&dmv->table_head, DM_TABLE_INACTIVE))
 423                 DM_ADD_FLAG(flags, DM_INACTIVE_PRESENT_FLAG);
 424         else
 425                 DM_REMOVE_FLAG(flags, DM_INACTIVE_PRESENT_FLAG);
 426
 427         dm_dev_unbusy(dmv);
 428
 429         return 0;
 430 }
 431 /*
 432  * Set only flag to suggest that device is suspended. This call is
 433  * not supported in NetBSD.
 434  *
 435  */
 436 int
 437 dm_dev_suspend_ioctl(prop_dictionary_t dm_dict)
 438 {
 439         dm_dev_t *dmv;
 440         const char *name, *uuid;
 441         uint32_t flags, minor;
 442
 443         name = NULL;
 444         uuid = NULL;
 445         flags = 0;
 446
 447         prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name);
 448         prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid);
 449         prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags);
 450         prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor);
 451
 452         if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) {
 453                 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG);
 454                 return ENOENT;
 455         }
 456         atomic_set_int(&dmv->flags, DM_SUSPEND_FLAG);
 457
 458         dm_dbg_print_flags(dmv->flags);
 459
 460         prop_dictionary_set_uint32(dm_dict, DM_IOCTL_OPEN, dmv->table_head.io_cnt);
 461         prop_dictionary_set_uint32(dm_dict, DM_IOCTL_FLAGS, dmv->flags);
 462         prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor);
 463
 464         dm_dev_unbusy(dmv);
 465
 466         /* Add flags to dictionary flag after dmv -> dict copy */
 467         DM_ADD_FLAG(flags, DM_EXISTS_FLAG);
 468
 469         return 0;
 470 }
 471 /*
 472  * Simulate Linux behaviour better and switch tables here and not in
 473  * dm_table_load_ioctl.
 474  */
 475 int
 476 dm_dev_resume_ioctl(prop_dictionary_t dm_dict)
 477 {
 478         dm_dev_t *dmv;
 479         const char *name, *uuid;
 480         uint32_t flags, minor;
 481
 482         name = NULL;
 483         uuid = NULL;
 484         flags = 0;
 485
 486         /*
 487          * char *xml; xml = prop_dictionary_externalize(dm_dict);
 488          * printf("%s\n",xml);
 489          */
 490
 491         prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name);
 492         prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid);
 493         prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags);
 494         prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor);
 495
 496         /* Remove device from global device list */
 497         if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) {
 498                 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG);
 499                 return ENOENT;
 500         }
 501         atomic_clear_int(&dmv->flags, (DM_SUSPEND_FLAG | DM_INACTIVE_PRESENT_FLAG));
 502         atomic_set_int(&dmv->flags, DM_ACTIVE_PRESENT_FLAG);
 503
 504         dm_table_switch_tables(&dmv->table_head);
 505
 506         DM_ADD_FLAG(flags, DM_EXISTS_FLAG);
 507
 508         dmsetdiskinfo(dmv->diskp, &dmv->table_head);
 509
 510         prop_dictionary_set_uint32(dm_dict, DM_IOCTL_OPEN, dmv->table_head.io_cnt);
 511         prop_dictionary_set_uint32(dm_dict, DM_IOCTL_FLAGS, flags);
 512         prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor);
 513
 514         dm_dev_unbusy(dmv);
 515
 516         /* Destroy inactive table after resume. */
 517         dm_table_destroy(&dmv->table_head, DM_TABLE_INACTIVE);
 518
 519         return 0;
 520 }
 521 /*
 522  * Table management routines
 523  * lvm2tools doens't send name/uuid to kernel with table
 524  * for lookup I have to use minor number.
 525  */
 526
 527 /*
 528  * Remove inactive table from device. Routines which work's with inactive tables
 529  * doesn't need to synchronise with dmstrategy. They can synchronise themselves with mutex?.
 530  *
 531  */
 532 int
 533 dm_table_clear_ioctl(prop_dictionary_t dm_dict)
 534 {
 535         dm_dev_t *dmv;
 536         const char *name, *uuid;
 537         uint32_t flags, minor;
 538
 539         dmv = NULL;
 540         name = NULL;
 541         uuid = NULL;
 542         flags = 0;
 543         minor = 0;
 544
 545         prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name);
 546         prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid);
 547         prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags);
 548         prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor);
 549
 550         aprint_debug("Clearing inactive table from device: %s--%s\n",
 551             name, uuid);
 552
 553         if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) {
 554                 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG);
 555                 return ENOENT;
 556         }
 557         /* Select unused table */
 558         dm_table_destroy(&dmv->table_head, DM_TABLE_INACTIVE);
 559
 560         atomic_clear_int(&dmv->flags, DM_INACTIVE_PRESENT_FLAG);
 561
 562         dm_dev_unbusy(dmv);
 563
 564         return 0;
 565 }
 566 /*
 567  * Get list of physical devices for active table.
 568  * Get dev_t from pdev vnode and insert it into cmd_array.
 569  *
 570  * XXX. This function is called from lvm2tools to get information
 571  *      about physical devices, too e.g. during vgcreate.
 572  */
 573 int
 574 dm_table_deps_ioctl(prop_dictionary_t dm_dict)
 575 {
 576         dm_dev_t *dmv;
 577         dm_table_t *tbl;
 578         dm_table_entry_t *table_en;
 579
 580         prop_array_t cmd_array;
 581         const char *name, *uuid;
 582         uint32_t flags, minor;
 583
 584         int table_type;
 585         size_t i;
 586
 587         name = NULL;
 588         uuid = NULL;
 589         dmv = NULL;
 590         flags = 0;
 591
 592         i = 0;
 593
 594         prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name);
 595         prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid);
 596         prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags);
 597         prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor);
 598
 599         /* create array for dev_t's */
 600         cmd_array = prop_array_create();
 601
 602         if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) {
 603                 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG);
 604                 return ENOENT;
 605         }
 606         prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor);
 607         prop_dictionary_set_cstring(dm_dict, DM_IOCTL_NAME, dmv->name);
 608         prop_dictionary_set_cstring(dm_dict, DM_IOCTL_UUID, dmv->uuid);
 609
 610         aprint_debug("Getting table deps for device: %s\n", dmv->name);
 611
 612         /*
 613          * if DM_QUERY_INACTIVE_TABLE_FLAG is passed we need to query
 614          * INACTIVE TABLE
 615          */
 616         if (flags & DM_QUERY_INACTIVE_TABLE_FLAG)
 617                 table_type = DM_TABLE_INACTIVE;
 618         else
 619                 table_type = DM_TABLE_ACTIVE;
 620
 621         tbl = dm_table_get_entry(&dmv->table_head, table_type);
 622
 623         SLIST_FOREACH(table_en, tbl, next)
 624             table_en->target->deps(table_en, cmd_array);
 625
 626         dm_table_release(&dmv->table_head, table_type);
 627         dm_dev_unbusy(dmv);
 628
 629         prop_dictionary_set(dm_dict, DM_IOCTL_CMD_DATA, cmd_array);
 630         prop_object_release(cmd_array);
 631
 632         return 0;
 633 }
 634 /*
 635  * Load new table/tables to device.
 636  * Call apropriate target init routine open all physical pdev's and
 637  * link them to device. For other targets mirror, strip, snapshot
 638  * etc. also add dependency devices to upcalls list.
 639  *
 640  * Load table to inactive slot table are switched in dm_device_resume_ioctl.
 641  * This simulates Linux behaviour better there should not be any difference.
 642  *
 643  */
 644 int
 645 dm_table_load_ioctl(prop_dictionary_t dm_dict)
 646 {
 647         dm_dev_t *dmv;
 648         dm_table_entry_t *table_en, *last_table;
 649         dm_table_t *tbl;
 650         dm_target_t *target;
 651
 652         prop_object_iterator_t iter;
 653         prop_array_t cmd_array;
 654         prop_dictionary_t target_dict;
 655
 656         const char *name, *uuid, *type;
 657
 658         uint32_t flags, ret, minor;
 659
 660         char *str;
 661
 662         ret = 0;
 663         flags = 0;
 664         name = NULL;
 665         uuid = NULL;
 666         dmv = NULL;
 667         last_table = NULL;
 668         str = NULL;
 669
 670         /*
 671          * char *xml; xml = prop_dictionary_externalize(dm_dict);
 672          * printf("%s\n",xml);
 673          */
 674
 675         prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name);
 676         prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid);
 677         prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags);
 678         prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor);
 679
 680         cmd_array = prop_dictionary_get(dm_dict, DM_IOCTL_CMD_DATA);
 681         iter = prop_array_iterator(cmd_array);
 682         dm_dbg_print_flags(flags);
 683
 684         if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) {
 685                 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG);
 686                 return ENOENT;
 687         }
 688         aprint_debug("Loading table to device: %s--%d\n", name,
 689             dmv->table_head.cur_active_table);
 690
 691         /*
 692          * I have to check if this table slot is not used by another table list.
 693          * if it is used I should free them.
 694          */
 695         if (dmv->flags & DM_INACTIVE_PRESENT_FLAG)
 696                 dm_table_destroy(&dmv->table_head, DM_TABLE_INACTIVE);
 697
 698         dm_dbg_print_flags(dmv->flags);
 699         tbl = dm_table_get_entry(&dmv->table_head, DM_TABLE_INACTIVE);
 700
 701         aprint_debug("dmv->name = %s\n", dmv->name);
 702
 703         prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor);
 704
 705         while ((target_dict = prop_object_iterator_next(iter)) != NULL) {
 706                 prop_dictionary_get_cstring_nocopy(target_dict,
 707                     DM_TABLE_TYPE, &type);
 708                 /*
 709                  * If we want to deny table with 2 or more different
 710                  * target we should do it here
 711                  */
 712                 if (((target = dm_target_lookup(type)) == NULL) &&
 713                     ((target = dm_target_autoload(type)) == NULL)) {
 714                         dm_table_release(&dmv->table_head, DM_TABLE_INACTIVE);
 715                         dm_dev_unbusy(dmv);
 716                         return ENOENT;
 717                 }
 718                 if ((table_en = kmalloc(sizeof(dm_table_entry_t),
 719                             M_DM, M_WAITOK)) == NULL) {
 720                         dm_table_release(&dmv->table_head, DM_TABLE_INACTIVE);
 721                         dm_dev_unbusy(dmv);
 722                         dm_target_unbusy(target);
 723                         return ENOMEM;
 724                 }
 725                 prop_dictionary_get_uint64(target_dict, DM_TABLE_START,
 726                     &table_en->start);
 727                 prop_dictionary_get_uint64(target_dict, DM_TABLE_LENGTH,
 728                     &table_en->length);
 729
 730                 aprint_debug("dm_ioctl.c... table_en->start = %ju, "
 731                              "table_en->length = %ju\n",
 732                              (uintmax_t)table_en->start,
 733                              (uintmax_t)table_en->length);
 734
 735                 table_en->target = target;
 736                 table_en->dm_dev = dmv;
 737                 table_en->target_config = NULL;
 738
 739                 /*
 740                  * There is a parameter string after dm_target_spec
 741                  * structure which  points to /dev/wd0a 284 part of
 742                  * table. String str points to this text. This can be
 743                  * null and therefore it should be checked before we try to
 744                  * use it.
 745                  */
 746                 prop_dictionary_get_cstring(target_dict,
 747                     DM_TABLE_PARAMS, (char **) &str);
 748
 749                 if (SLIST_EMPTY(tbl))
 750                         /* insert this table to head */
 751                         SLIST_INSERT_HEAD(tbl, table_en, next);
 752                 else
 753                         SLIST_INSERT_AFTER(last_table, table_en, next);
 754
 755                 /*
 756                  * Params string is different for every target,
 757                  * therfore I have to pass it to target init
 758                  * routine and parse parameters there.
 759                  */
 760                 aprint_debug("DM: str passed in is: %s", str);
 761                 if ((ret = target->init(dmv, &table_en->target_config,
 762                             str)) != 0) {
 763
 764                         dm_table_release(&dmv->table_head, DM_TABLE_INACTIVE);
 765                         dm_table_destroy(&dmv->table_head, DM_TABLE_INACTIVE);
 766                         kfree(str, M_TEMP);
 767
 768                         dm_dev_unbusy(dmv);
 769                         dm_target_unbusy(target);
 770                         return ret;
 771                 }
 772                 last_table = table_en;
 773                 kfree(str, M_TEMP);
 774         }
 775         prop_object_iterator_release(iter);
 776
 777         DM_ADD_FLAG(flags, DM_INACTIVE_PRESENT_FLAG);
 778         atomic_set_int(&dmv->flags, DM_INACTIVE_PRESENT_FLAG);
 779
 780         dm_table_release(&dmv->table_head, DM_TABLE_INACTIVE);
 781
 782         dm_dev_unbusy(dmv);
 783 #if 0
 784         dmsetdiskinfo(dmv->diskp, &dmv->table_head);
 785 #endif
 786         return 0;
 787 }
 788 /*
 789  * Get description of all tables loaded to device from kernel
 790  * and send it to libdevmapper.
 791  *
 792  * Output dictionary for every table:
 793  *
 794  * <key>cmd_data</key>
 795  * <array>
 796  *   <dict>
 797  *    <key>type<key>
 798  *    <string>...</string>
 799  *
 800  *    <key>start</key>
 801  *    <integer>...</integer>
 802  *
 803  *    <key>length</key>
 804  *    <integer>...</integer>
 805  *
 806  *    <key>params</key>
 807  *    <string>...</string>
 808  *   </dict>
 809  * </array>
 810  *
 811  */
 812 int
 813 dm_table_status_ioctl(prop_dictionary_t dm_dict)
 814 {
 815         dm_dev_t *dmv;
 816         dm_table_t *tbl;
 817         dm_table_entry_t *table_en;
 818
 819         prop_array_t cmd_array;
 820         prop_dictionary_t target_dict;
 821
 822         uint32_t rec_size, minor;
 823
 824         const char *name, *uuid;
 825         char *params;
 826         int flags;
 827         int table_type;
 828
 829         dmv = NULL;
 830         uuid = NULL;
 831         name = NULL;
 832         params = NULL;
 833         flags = 0;
 834         rec_size = 0;
 835
 836         prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name);
 837         prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid);
 838         prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags);
 839         prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor);
 840
 841         cmd_array = prop_array_create();
 842
 843         if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) {
 844                 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG);
 845                 return ENOENT;
 846         }
 847         /*
 848          * if DM_QUERY_INACTIVE_TABLE_FLAG is passed we need to query
 849          * INACTIVE TABLE
 850          */
 851         if (flags & DM_QUERY_INACTIVE_TABLE_FLAG)
 852                 table_type = DM_TABLE_INACTIVE;
 853         else
 854                 table_type = DM_TABLE_ACTIVE;
 855
 856         if (dm_table_get_target_count(&dmv->table_head, DM_TABLE_ACTIVE))
 857                 DM_ADD_FLAG(flags, DM_ACTIVE_PRESENT_FLAG);
 858         else {
 859                 DM_REMOVE_FLAG(flags, DM_ACTIVE_PRESENT_FLAG);
 860
 861                 if (dm_table_get_target_count(&dmv->table_head, DM_TABLE_INACTIVE))
 862                         DM_ADD_FLAG(flags, DM_INACTIVE_PRESENT_FLAG);
 863                 else {
 864                         DM_REMOVE_FLAG(flags, DM_INACTIVE_PRESENT_FLAG);
 865                 }
 866         }
 867
 868         if (dmv->flags & DM_SUSPEND_FLAG)
 869                 DM_ADD_FLAG(flags, DM_SUSPEND_FLAG);
 870
 871         prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor);
 872
 873         aprint_debug("Status of device tables: %s--%d\n",
 874             name, dmv->table_head.cur_active_table);
 875
 876         tbl = dm_table_get_entry(&dmv->table_head, table_type);
 877
 878         SLIST_FOREACH(table_en, tbl, next) {
 879                 target_dict = prop_dictionary_create();
 880                 aprint_debug("%016" PRIu64 ", length %016" PRIu64
 881                     ", target %s\n", table_en->start, table_en->length,
 882                     table_en->target->name);
 883
 884                 prop_dictionary_set_uint64(target_dict, DM_TABLE_START,
 885                     table_en->start);
 886                 prop_dictionary_set_uint64(target_dict, DM_TABLE_LENGTH,
 887                     table_en->length);
 888
 889                 prop_dictionary_set_cstring(target_dict, DM_TABLE_TYPE,
 890                     table_en->target->name);
 891
 892                 /* dm_table_get_cur_actv.table ?? */
 893                 prop_dictionary_set_int32(target_dict, DM_TABLE_STAT,
 894                     dmv->table_head.cur_active_table);
 895
 896                 if (flags & DM_STATUS_TABLE_FLAG) {
 897                         params = table_en->target->status
 898                             (table_en->target_config);
 899
 900                         if (params != NULL) {
 901                                 prop_dictionary_set_cstring(target_dict,
 902                                     DM_TABLE_PARAMS, params);
 903
 904                                 kfree(params, M_DM);
 905                         }
 906                 }
 907                 prop_array_add(cmd_array, target_dict);
 908                 prop_object_release(target_dict);
 909         }
 910
 911         dm_table_release(&dmv->table_head, table_type);
 912         dm_dev_unbusy(dmv);
 913
 914         prop_dictionary_set_uint32(dm_dict, DM_IOCTL_FLAGS, flags);
 915         prop_dictionary_set(dm_dict, DM_IOCTL_CMD_DATA, cmd_array);
 916         prop_object_release(cmd_array);
 917
 918         return 0;
 919 }
 920
 921 int
 922 dm_message_ioctl(prop_dictionary_t dm_dict)
 923 {
 924         dm_table_t  *tbl;
 925         dm_table_entry_t *table_en;
 926         dm_dev_t *dmv;
 927         const char *name, *uuid;
 928         uint32_t flags, minor;
 929         uint64_t table_start, table_end, sector;
 930         char *msg;
 931         int ret, found = 0;
 932
 933         flags = 0;
 934         name = NULL;
 935         uuid = NULL;
 936
 937         /* Get needed values from dictionary. */
 938         prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name);
 939         prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid);
 940         prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags);
 941         prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor);
 942         prop_dictionary_get_uint64(dm_dict, DM_MESSAGE_SECTOR, &sector);
 943
 944         dm_dbg_print_flags(flags);
 945
 946         if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) {
 947                 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG);
 948                 return ENOENT;
 949         }
 950
 951         /* Get message string */
 952         prop_dictionary_get_cstring(dm_dict, DM_MESSAGE_STR, &msg);
 953
 954         tbl = dm_table_get_entry(&dmv->table_head, DM_TABLE_ACTIVE);
 955
 956         ret = EINVAL;
 957
 958         if (sector == 0) {
 959                 if (!SLIST_EMPTY(tbl)) {
 960                         table_en = SLIST_FIRST(tbl);
 961                         found = 1;
 962                 }
 963         } else {
 964                 SLIST_FOREACH(table_en, tbl, next) {
 965                         table_start = table_en->start;
 966                         table_end = table_start + (table_en->length);
 967
 968                         if ((sector >= table_start) && (sector < table_end)) {
 969                                 found = 1;
 970                                 break;
 971                         }
 972                 }
 973         }
 974
 975         if (found) {
 976                 if (table_en->target->message != NULL)
 977                         ret = table_en->target->message(table_en, msg);
 978         }
 979
 980         dm_table_release(&dmv->table_head, DM_TABLE_ACTIVE);
 981
 982
 983         kfree(msg, M_TEMP);
 984         dm_dev_unbusy(dmv);
 985
 986         return ret;
 987 }
 988
 989 /*
 990  * For every call I have to set kernel driver version.
 991  * Because I can have commands supported only in other
 992  * newer/later version. This routine is called for every
 993  * ioctl command.
 994  */
 995 int
 996 dm_check_version(prop_dictionary_t dm_dict)
 997 {
 998         size_t i;
 999         int dm_version[3];
1000         prop_array_t ver;
1001
1002         ver = prop_dictionary_get(dm_dict, DM_IOCTL_VERSION);
1003
1004         for (i = 0; i < 3; i++)
1005                 prop_array_get_uint32(ver, i, &dm_version[i]);
1006
1007         if (DM_VERSION_MAJOR != dm_version[0] || DM_VERSION_MINOR < dm_version[1]) {
1008                 aprint_debug("libdevmapper/kernel version mismatch "
1009                     "kernel: %d.%d.%d libdevmapper: %d.%d.%d\n",
1010                     DM_VERSION_MAJOR, DM_VERSION_MINOR, DM_VERSION_PATCHLEVEL,
1011                     dm_version[0], dm_version[1], dm_version[2]);
1012
1013                 return EIO;
1014         }
1015         prop_array_set_uint32(ver, 0, DM_VERSION_MAJOR);
1016         prop_array_set_uint32(ver, 1, DM_VERSION_MINOR);
1017         prop_array_set_uint32(ver, 2, DM_VERSION_PATCHLEVEL);
1018
1019         prop_dictionary_set(dm_dict, DM_IOCTL_VERSION, ver);
1020
1021         return 0;
1022 }