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;
 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         /*
 343          * This seems as hack to me, probably use routine dm_dev_get_devt to
 344          * atomicaly get devt from device.
 345          */
 346         if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) {
 347                 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG);
 348                 return ENOENT;
 349         }
 350
 351         dm_dev_unbusy(dmv);
 352
 353         if (dmv->is_open)
 354                 return EBUSY;
 355
 356         /*
 357          * This will call dm_detach routine which will actually remove
 358          * device.
 359          */
 360         return dm_dev_remove(dmv);
 361 }
 362
 363 /*
 364  * Try to remove all devices
 365  */
 366 int
 367 dm_dev_remove_all_ioctl(prop_dictionary_t dm_dict)
 368 {
 369         uint32_t flags = 0;
 370
 371         /* Get needed values from dictionary. */
 372         prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags);
 373
 374         dm_dbg_print_flags(flags);
 375
 376         /* Gently remove all devices, if possible */
 377         return dm_dev_remove_all(1);
 378 }
 379
 380 /*
 381  * Return actual state of device to libdevmapper.
 382  */
 383 int
 384 dm_dev_status_ioctl(prop_dictionary_t dm_dict)
 385 {
 386         dm_dev_t *dmv;
 387         const char *name, *uuid;
 388         uint32_t flags, j, minor;
 389
 390         name = NULL;
 391         uuid = NULL;
 392         flags = 0;
 393         j = 0;
 394
 395         prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name);
 396         prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid);
 397         prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags);
 398         prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor);
 399
 400         if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) {
 401                 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG);
 402                 return ENOENT;
 403         }
 404         dm_dbg_print_flags(dmv->flags);
 405
 406         prop_dictionary_set_uint32(dm_dict, DM_IOCTL_OPEN, dmv->table_head.io_cnt);
 407         prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor);
 408         prop_dictionary_set_cstring(dm_dict, DM_IOCTL_UUID, dmv->uuid);
 409
 410         if (dmv->flags & DM_SUSPEND_FLAG)
 411                 DM_ADD_FLAG(flags, DM_SUSPEND_FLAG);
 412
 413         /*
 414          * Add status flags for tables I have to check both active and
 415          * inactive tables.
 416          */
 417         if ((j = dm_table_get_target_count(&dmv->table_head, DM_TABLE_ACTIVE))) {
 418                 DM_ADD_FLAG(flags, DM_ACTIVE_PRESENT_FLAG);
 419         } else
 420                 DM_REMOVE_FLAG(flags, DM_ACTIVE_PRESENT_FLAG);
 421
 422         prop_dictionary_set_uint32(dm_dict, DM_IOCTL_TARGET_COUNT, j);
 423
 424         if (dm_table_get_target_count(&dmv->table_head, DM_TABLE_INACTIVE))
 425                 DM_ADD_FLAG(flags, DM_INACTIVE_PRESENT_FLAG);
 426         else
 427                 DM_REMOVE_FLAG(flags, DM_INACTIVE_PRESENT_FLAG);
 428
 429         dm_dev_unbusy(dmv);
 430
 431         return 0;
 432 }
 433 /*
 434  * Set only flag to suggest that device is suspended. This call is
 435  * not supported in NetBSD.
 436  *
 437  */
 438 int
 439 dm_dev_suspend_ioctl(prop_dictionary_t dm_dict)
 440 {
 441         dm_dev_t *dmv;
 442         const char *name, *uuid;
 443         uint32_t flags, minor;
 444
 445         name = NULL;
 446         uuid = NULL;
 447         flags = 0;
 448
 449         prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name);
 450         prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid);
 451         prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags);
 452         prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor);
 453
 454         if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) {
 455                 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG);
 456                 return ENOENT;
 457         }
 458         atomic_set_int(&dmv->flags, DM_SUSPEND_FLAG);
 459
 460         dm_dbg_print_flags(dmv->flags);
 461
 462         prop_dictionary_set_uint32(dm_dict, DM_IOCTL_OPEN, dmv->table_head.io_cnt);
 463         prop_dictionary_set_uint32(dm_dict, DM_IOCTL_FLAGS, dmv->flags);
 464         prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor);
 465
 466         dm_dev_unbusy(dmv);
 467
 468         /* Add flags to dictionary flag after dmv -> dict copy */
 469         DM_ADD_FLAG(flags, DM_EXISTS_FLAG);
 470
 471         return 0;
 472 }
 473 /*
 474  * Simulate Linux behaviour better and switch tables here and not in
 475  * dm_table_load_ioctl.
 476  */
 477 int
 478 dm_dev_resume_ioctl(prop_dictionary_t dm_dict)
 479 {
 480         dm_dev_t *dmv;
 481         const char *name, *uuid;
 482         uint32_t flags, minor;
 483
 484         name = NULL;
 485         uuid = NULL;
 486         flags = 0;
 487
 488         /*
 489          * char *xml; xml = prop_dictionary_externalize(dm_dict);
 490          * printf("%s\n",xml);
 491          */
 492
 493         prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name);
 494         prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid);
 495         prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags);
 496         prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor);
 497
 498         /* Remove device from global device list */
 499         if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) {
 500                 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG);
 501                 return ENOENT;
 502         }
 503         atomic_clear_int(&dmv->flags, (DM_SUSPEND_FLAG | DM_INACTIVE_PRESENT_FLAG));
 504         atomic_set_int(&dmv->flags, DM_ACTIVE_PRESENT_FLAG);
 505
 506         dm_table_switch_tables(&dmv->table_head);
 507
 508         DM_ADD_FLAG(flags, DM_EXISTS_FLAG);
 509
 510         dmsetdiskinfo(dmv->diskp, &dmv->table_head);
 511
 512         prop_dictionary_set_uint32(dm_dict, DM_IOCTL_OPEN, dmv->table_head.io_cnt);
 513         prop_dictionary_set_uint32(dm_dict, DM_IOCTL_FLAGS, flags);
 514         prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor);
 515
 516         dm_dev_unbusy(dmv);
 517
 518         /* Destroy inactive table after resume. */
 519         dm_table_destroy(&dmv->table_head, DM_TABLE_INACTIVE);
 520
 521         return 0;
 522 }
 523 /*
 524  * Table management routines
 525  * lvm2tools doens't send name/uuid to kernel with table
 526  * for lookup I have to use minor number.
 527  */
 528
 529 /*
 530  * Remove inactive table from device. Routines which work's with inactive tables
 531  * doesn't need to synchronise with dmstrategy. They can synchronise themselves with mutex?.
 532  *
 533  */
 534 int
 535 dm_table_clear_ioctl(prop_dictionary_t dm_dict)
 536 {
 537         dm_dev_t *dmv;
 538         const char *name, *uuid;
 539         uint32_t flags, minor;
 540
 541         dmv = NULL;
 542         name = NULL;
 543         uuid = NULL;
 544         flags = 0;
 545         minor = 0;
 546
 547         prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name);
 548         prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid);
 549         prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags);
 550         prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor);
 551
 552         aprint_debug("Clearing inactive table from device: %s--%s\n",
 553             name, uuid);
 554
 555         if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) {
 556                 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG);
 557                 return ENOENT;
 558         }
 559         /* Select unused table */
 560         dm_table_destroy(&dmv->table_head, DM_TABLE_INACTIVE);
 561
 562         atomic_clear_int(&dmv->flags, DM_INACTIVE_PRESENT_FLAG);
 563
 564         dm_dev_unbusy(dmv);
 565
 566         return 0;
 567 }
 568 /*
 569  * Get list of physical devices for active table.
 570  * Get dev_t from pdev vnode and insert it into cmd_array.
 571  *
 572  * XXX. This function is called from lvm2tools to get information
 573  *      about physical devices, too e.g. during vgcreate.
 574  */
 575 int
 576 dm_table_deps_ioctl(prop_dictionary_t dm_dict)
 577 {
 578         dm_dev_t *dmv;
 579         dm_table_t *tbl;
 580         dm_table_entry_t *table_en;
 581
 582         prop_array_t cmd_array;
 583         const char *name, *uuid;
 584         uint32_t flags, minor;
 585
 586         int table_type;
 587         size_t i;
 588
 589         name = NULL;
 590         uuid = NULL;
 591         dmv = NULL;
 592         flags = 0;
 593
 594         i = 0;
 595
 596         prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name);
 597         prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid);
 598         prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags);
 599         prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor);
 600
 601         /* create array for dev_t's */
 602         cmd_array = prop_array_create();
 603
 604         if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) {
 605                 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG);
 606                 return ENOENT;
 607         }
 608         prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor);
 609         prop_dictionary_set_cstring(dm_dict, DM_IOCTL_NAME, dmv->name);
 610         prop_dictionary_set_cstring(dm_dict, DM_IOCTL_UUID, dmv->uuid);
 611
 612         aprint_debug("Getting table deps for device: %s\n", dmv->name);
 613
 614         /*
 615          * if DM_QUERY_INACTIVE_TABLE_FLAG is passed we need to query
 616          * INACTIVE TABLE
 617          */
 618         if (flags & DM_QUERY_INACTIVE_TABLE_FLAG)
 619                 table_type = DM_TABLE_INACTIVE;
 620         else
 621                 table_type = DM_TABLE_ACTIVE;
 622
 623         tbl = dm_table_get_entry(&dmv->table_head, table_type);
 624
 625         SLIST_FOREACH(table_en, tbl, next)
 626             table_en->target->deps(table_en, cmd_array);
 627
 628         dm_table_release(&dmv->table_head, table_type);
 629         dm_dev_unbusy(dmv);
 630
 631         prop_dictionary_set(dm_dict, DM_IOCTL_CMD_DATA, cmd_array);
 632         prop_object_release(cmd_array);
 633
 634         return 0;
 635 }
 636 /*
 637  * Load new table/tables to device.
 638  * Call apropriate target init routine open all physical pdev's and
 639  * link them to device. For other targets mirror, strip, snapshot
 640  * etc. also add dependency devices to upcalls list.
 641  *
 642  * Load table to inactive slot table are switched in dm_device_resume_ioctl.
 643  * This simulates Linux behaviour better there should not be any difference.
 644  *
 645  */
 646 int
 647 dm_table_load_ioctl(prop_dictionary_t dm_dict)
 648 {
 649         dm_dev_t *dmv;
 650         dm_table_entry_t *table_en, *last_table;
 651         dm_table_t *tbl;
 652         dm_target_t *target;
 653
 654         prop_object_iterator_t iter;
 655         prop_array_t cmd_array;
 656         prop_dictionary_t target_dict;
 657
 658         const char *name, *uuid, *type;
 659
 660         uint32_t flags, ret, minor;
 661
 662         char *str;
 663
 664         ret = 0;
 665         flags = 0;
 666         name = NULL;
 667         uuid = NULL;
 668         dmv = NULL;
 669         last_table = NULL;
 670         str = NULL;
 671
 672         /*
 673          * char *xml; xml = prop_dictionary_externalize(dm_dict);
 674          * printf("%s\n",xml);
 675          */
 676
 677         prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name);
 678         prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid);
 679         prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags);
 680         prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor);
 681
 682         cmd_array = prop_dictionary_get(dm_dict, DM_IOCTL_CMD_DATA);
 683         iter = prop_array_iterator(cmd_array);
 684         dm_dbg_print_flags(flags);
 685
 686         if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) {
 687                 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG);
 688                 return ENOENT;
 689         }
 690         aprint_debug("Loading table to device: %s--%d\n", name,
 691             dmv->table_head.cur_active_table);
 692
 693         /*
 694          * I have to check if this table slot is not used by another table list.
 695          * if it is used I should free them.
 696          */
 697         if (dmv->flags & DM_INACTIVE_PRESENT_FLAG)
 698                 dm_table_destroy(&dmv->table_head, DM_TABLE_INACTIVE);
 699
 700         dm_dbg_print_flags(dmv->flags);
 701         tbl = dm_table_get_entry(&dmv->table_head, DM_TABLE_INACTIVE);
 702
 703         aprint_debug("dmv->name = %s\n", dmv->name);
 704
 705         prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor);
 706
 707         while ((target_dict = prop_object_iterator_next(iter)) != NULL) {
 708                 prop_dictionary_get_cstring_nocopy(target_dict,
 709                     DM_TABLE_TYPE, &type);
 710                 /*
 711                  * If we want to deny table with 2 or more different
 712                  * target we should do it here
 713                  */
 714                 if (((target = dm_target_lookup(type)) == NULL) &&
 715                     ((target = dm_target_autoload(type)) == NULL)) {
 716                         dm_table_release(&dmv->table_head, DM_TABLE_INACTIVE);
 717                         dm_dev_unbusy(dmv);
 718                         return ENOENT;
 719                 }
 720                 if ((table_en = kmalloc(sizeof(dm_table_entry_t),
 721                             M_DM, M_WAITOK)) == NULL) {
 722                         dm_table_release(&dmv->table_head, DM_TABLE_INACTIVE);
 723                         dm_dev_unbusy(dmv);
 724                         dm_target_unbusy(target);
 725                         return ENOMEM;
 726                 }
 727                 prop_dictionary_get_uint64(target_dict, DM_TABLE_START,
 728                     &table_en->start);
 729                 prop_dictionary_get_uint64(target_dict, DM_TABLE_LENGTH,
 730                     &table_en->length);
 731
 732                 aprint_debug("dm_ioctl.c... table_en->start = %ju, "
 733                              "table_en->length = %ju\n",
 734                              (uintmax_t)table_en->start,
 735                              (uintmax_t)table_en->length);
 736
 737                 table_en->target = target;
 738                 table_en->dm_dev = dmv;
 739                 table_en->target_config = NULL;
 740
 741                 /*
 742                  * There is a parameter string after dm_target_spec
 743                  * structure which  points to /dev/wd0a 284 part of
 744                  * table. String str points to this text. This can be
 745                  * null and therefore it should be checked before we try to
 746                  * use it.
 747                  */
 748                 prop_dictionary_get_cstring(target_dict,
 749                     DM_TABLE_PARAMS, (char **) &str);
 750
 751                 if (SLIST_EMPTY(tbl))
 752                         /* insert this table to head */
 753                         SLIST_INSERT_HEAD(tbl, table_en, next);
 754                 else
 755                         SLIST_INSERT_AFTER(last_table, table_en, next);
 756
 757                 /*
 758                  * Params string is different for every target,
 759                  * therfore I have to pass it to target init
 760                  * routine and parse parameters there.
 761                  */
 762                 aprint_debug("DM: str passed in is: %s", str);
 763                 if ((ret = target->init(dmv, &table_en->target_config,
 764                             str)) != 0) {
 765
 766                         dm_table_release(&dmv->table_head, DM_TABLE_INACTIVE);
 767                         dm_table_destroy(&dmv->table_head, DM_TABLE_INACTIVE);
 768                         kfree(str, M_TEMP);
 769
 770                         dm_dev_unbusy(dmv);
 771                         dm_target_unbusy(target);
 772                         return ret;
 773                 }
 774                 last_table = table_en;
 775                 kfree(str, M_TEMP);
 776         }
 777         prop_object_iterator_release(iter);
 778
 779         DM_ADD_FLAG(flags, DM_INACTIVE_PRESENT_FLAG);
 780         atomic_set_int(&dmv->flags, DM_INACTIVE_PRESENT_FLAG);
 781
 782         dm_table_release(&dmv->table_head, DM_TABLE_INACTIVE);
 783
 784         dm_dev_unbusy(dmv);
 785 #if 0
 786         dmsetdiskinfo(dmv->diskp, &dmv->table_head);
 787 #endif
 788         return 0;
 789 }
 790 /*
 791  * Get description of all tables loaded to device from kernel
 792  * and send it to libdevmapper.
 793  *
 794  * Output dictionary for every table:
 795  *
 796  * <key>cmd_data</key>
 797  * <array>
 798  *   <dict>
 799  *    <key>type<key>
 800  *    <string>...</string>
 801  *
 802  *    <key>start</key>
 803  *    <integer>...</integer>
 804  *
 805  *    <key>length</key>
 806  *    <integer>...</integer>
 807  *
 808  *    <key>params</key>
 809  *    <string>...</string>
 810  *   </dict>
 811  * </array>
 812  *
 813  */
 814 int
 815 dm_table_status_ioctl(prop_dictionary_t dm_dict)
 816 {
 817         dm_dev_t *dmv;
 818         dm_table_t *tbl;
 819         dm_table_entry_t *table_en;
 820
 821         prop_array_t cmd_array;
 822         prop_dictionary_t target_dict;
 823
 824         uint32_t rec_size, minor;
 825
 826         const char *name, *uuid;
 827         char *params;
 828         int flags;
 829         int table_type;
 830
 831         dmv = NULL;
 832         uuid = NULL;
 833         name = NULL;
 834         params = NULL;
 835         flags = 0;
 836         rec_size = 0;
 837
 838         prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_NAME, &name);
 839         prop_dictionary_get_cstring_nocopy(dm_dict, DM_IOCTL_UUID, &uuid);
 840         prop_dictionary_get_uint32(dm_dict, DM_IOCTL_FLAGS, &flags);
 841         prop_dictionary_get_uint32(dm_dict, DM_IOCTL_MINOR, &minor);
 842
 843         cmd_array = prop_array_create();
 844
 845         if ((dmv = dm_dev_lookup(name, uuid, minor)) == NULL) {
 846                 DM_REMOVE_FLAG(flags, DM_EXISTS_FLAG);
 847                 return ENOENT;
 848         }
 849         /*
 850          * if DM_QUERY_INACTIVE_TABLE_FLAG is passed we need to query
 851          * INACTIVE TABLE
 852          */
 853         if (flags & DM_QUERY_INACTIVE_TABLE_FLAG)
 854                 table_type = DM_TABLE_INACTIVE;
 855         else
 856                 table_type = DM_TABLE_ACTIVE;
 857
 858         if (dm_table_get_target_count(&dmv->table_head, DM_TABLE_ACTIVE))
 859                 DM_ADD_FLAG(flags, DM_ACTIVE_PRESENT_FLAG);
 860         else {
 861                 DM_REMOVE_FLAG(flags, DM_ACTIVE_PRESENT_FLAG);
 862
 863                 if (dm_table_get_target_count(&dmv->table_head, DM_TABLE_INACTIVE))
 864                         DM_ADD_FLAG(flags, DM_INACTIVE_PRESENT_FLAG);
 865                 else {
 866                         DM_REMOVE_FLAG(flags, DM_INACTIVE_PRESENT_FLAG);
 867                 }
 868         }
 869
 870         if (dmv->flags & DM_SUSPEND_FLAG)
 871                 DM_ADD_FLAG(flags, DM_SUSPEND_FLAG);
 872
 873         prop_dictionary_set_uint32(dm_dict, DM_IOCTL_MINOR, dmv->minor);
 874
 875         aprint_debug("Status of device tables: %s--%d\n",
 876             name, dmv->table_head.cur_active_table);
 877
 878         tbl = dm_table_get_entry(&dmv->table_head, table_type);
 879
 880         SLIST_FOREACH(table_en, tbl, next) {
 881                 target_dict = prop_dictionary_create();
 882                 aprint_debug("%016" PRIu64 ", length %016" PRIu64
 883                     ", target %s\n", table_en->start, table_en->length,
 884                     table_en->target->name);
 885
 886                 prop_dictionary_set_uint64(target_dict, DM_TABLE_START,
 887                     table_en->start);
 888                 prop_dictionary_set_uint64(target_dict, DM_TABLE_LENGTH,
 889                     table_en->length);
 890
 891                 prop_dictionary_set_cstring(target_dict, DM_TABLE_TYPE,
 892                     table_en->target->name);
 893
 894                 /* dm_table_get_cur_actv.table ?? */
 895                 prop_dictionary_set_int32(target_dict, DM_TABLE_STAT,
 896                     dmv->table_head.cur_active_table);
 897
 898                 if (flags |= DM_STATUS_TABLE_FLAG) {
 899                         params = table_en->target->status
 900                             (table_en->target_config);
 901
 902                         if (params != NULL) {
 903                                 prop_dictionary_set_cstring(target_dict,
 904                                     DM_TABLE_PARAMS, params);
 905
 906                                 kfree(params, M_DM);
 907                         }
 908                 }
 909                 prop_array_add(cmd_array, target_dict);
 910                 prop_object_release(target_dict);
 911         }
 912
 913         dm_table_release(&dmv->table_head, table_type);
 914         dm_dev_unbusy(dmv);
 915
 916         prop_dictionary_set_uint32(dm_dict, DM_IOCTL_FLAGS, flags);
 917         prop_dictionary_set(dm_dict, DM_IOCTL_CMD_DATA, cmd_array);
 918         prop_object_release(cmd_array);
 919
 920         return 0;
 921 }
 922
 923
 924 /*
 925  * For every call I have to set kernel driver version.
 926  * Because I can have commands supported only in other
 927  * newer/later version. This routine is called for every
 928  * ioctl command.
 929  */
 930 int
 931 dm_check_version(prop_dictionary_t dm_dict)
 932 {
 933         size_t i;
 934         int dm_version[3];
 935         prop_array_t ver;
 936
 937         ver = prop_dictionary_get(dm_dict, DM_IOCTL_VERSION);
 938
 939         for (i = 0; i < 3; i++)
 940                 prop_array_get_uint32(ver, i, &dm_version[i]);
 941
 942         if (DM_VERSION_MAJOR != dm_version[0] || DM_VERSION_MINOR < dm_version[1]) {
 943                 aprint_debug("libdevmapper/kernel version mismatch "
 944                     "kernel: %d.%d.%d libdevmapper: %d.%d.%d\n",
 945                     DM_VERSION_MAJOR, DM_VERSION_MINOR, DM_VERSION_PATCHLEVEL,
 946                     dm_version[0], dm_version[1], dm_version[2]);
 947
 948                 return EIO;
 949         }
 950         prop_array_set_uint32(ver, 0, DM_VERSION_MAJOR);
 951         prop_array_set_uint32(ver, 1, DM_VERSION_MINOR);
 952         prop_array_set_uint32(ver, 2, DM_VERSION_PATCHLEVEL);
 953
 954         prop_dictionary_set(dm_dict, DM_IOCTL_VERSION, ver);
 955
 956         return 0;
 957 }