sys/vfs/hammer/hammer_ioctl.c

   1 /*
   2  * Copyright (c) 2008 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/vfs/hammer/hammer_ioctl.c,v 1.32 2008/11/13 02:23:29 dillon Exp $
  35  */
  36
  37 #include "hammer.h"
  38
  39 static int hammer_ioc_gethistory(hammer_transaction_t trans, hammer_inode_t ip,
  40                                 struct hammer_ioc_history *hist);
  41 static int hammer_ioc_synctid(hammer_transaction_t trans, hammer_inode_t ip,
  42                                 struct hammer_ioc_synctid *std);
  43 static int hammer_ioc_get_version(hammer_transaction_t trans,
  44                                 hammer_inode_t ip,
  45                                 struct hammer_ioc_version *ver);
  46 static int hammer_ioc_set_version(hammer_transaction_t trans,
  47                                 hammer_inode_t ip,
  48                                 struct hammer_ioc_version *ver);
  49
  50 int
  51 hammer_ioctl(hammer_inode_t ip, u_long com, caddr_t data, int fflag,
  52              struct ucred *cred)
  53 {
  54         struct hammer_transaction trans;
  55         int error;
  56
  57         error = suser_cred(cred, PRISON_ROOT);
  58
  59         hammer_start_transaction(&trans, ip->hmp);
  60
  61         switch(com) {
  62         case HAMMERIOC_PRUNE:
  63                 if (error == 0) {
  64                         error = hammer_ioc_prune(&trans, ip,
  65                                         (struct hammer_ioc_prune *)data);
  66                 }
  67                 break;
  68         case HAMMERIOC_GETHISTORY:
  69                 error = hammer_ioc_gethistory(&trans, ip,
  70                                         (struct hammer_ioc_history *)data);
  71                 break;
  72         case HAMMERIOC_REBLOCK:
  73                 if (error == 0) {
  74                         error = hammer_ioc_reblock(&trans, ip,
  75                                         (struct hammer_ioc_reblock *)data);
  76                 }
  77                 break;
  78         case HAMMERIOC_SYNCTID:
  79                 error = hammer_ioc_synctid(&trans, ip,
  80                                         (struct hammer_ioc_synctid *)data);
  81                 break;
  82         case HAMMERIOC_GET_PSEUDOFS:
  83                 error = hammer_ioc_get_pseudofs(&trans, ip,
  84                                     (struct hammer_ioc_pseudofs_rw *)data);
  85                 break;
  86         case HAMMERIOC_SET_PSEUDOFS:
  87                 if (error == 0) {
  88                         error = hammer_ioc_set_pseudofs(&trans, ip, cred,
  89                                     (struct hammer_ioc_pseudofs_rw *)data);
  90                 }
  91                 break;
  92         case HAMMERIOC_UPG_PSEUDOFS:
  93                 if (error == 0) {
  94                         error = hammer_ioc_upgrade_pseudofs(&trans, ip,
  95                                     (struct hammer_ioc_pseudofs_rw *)data);
  96                 }
  97                 break;
  98         case HAMMERIOC_DGD_PSEUDOFS:
  99                 if (error == 0) {
 100                         error = hammer_ioc_downgrade_pseudofs(&trans, ip,
 101                                     (struct hammer_ioc_pseudofs_rw *)data);
 102                 }
 103                 break;
 104         case HAMMERIOC_RMR_PSEUDOFS:
 105                 if (error == 0) {
 106                         error = hammer_ioc_destroy_pseudofs(&trans, ip,
 107                                     (struct hammer_ioc_pseudofs_rw *)data);
 108                 }
 109                 break;
 110         case HAMMERIOC_WAI_PSEUDOFS:
 111                 if (error == 0) {
 112                         error = hammer_ioc_wait_pseudofs(&trans, ip,
 113                                     (struct hammer_ioc_pseudofs_rw *)data);
 114                 }
 115                 break;
 116         case HAMMERIOC_MIRROR_READ:
 117                 if (error == 0) {
 118                         error = hammer_ioc_mirror_read(&trans, ip,
 119                                     (struct hammer_ioc_mirror_rw *)data);
 120                 }
 121                 break;
 122         case HAMMERIOC_MIRROR_WRITE:
 123                 if (error == 0) {
 124                         error = hammer_ioc_mirror_write(&trans, ip,
 125                                     (struct hammer_ioc_mirror_rw *)data);
 126                 }
 127                 break;
 128         case HAMMERIOC_GET_VERSION:
 129                 error = hammer_ioc_get_version(&trans, ip,
 130                                     (struct hammer_ioc_version *)data);
 131                 break;
 132         case HAMMERIOC_SET_VERSION:
 133                 if (error == 0) {
 134                         error = hammer_ioc_set_version(&trans, ip,
 135                                             (struct hammer_ioc_version *)data);
 136                 }
 137                 break;
 138         default:
 139                 error = EOPNOTSUPP;
 140                 break;
 141         }
 142         hammer_done_transaction(&trans);
 143         return (error);
 144 }
 145
 146 /*
 147  * Iterate through an object's inode or an object's records and record
 148  * modification TIDs.
 149  */
 150 static void add_history(hammer_inode_t ip, struct hammer_ioc_history *hist,
 151                         hammer_btree_elm_t elm);
 152
 153 static
 154 int
 155 hammer_ioc_gethistory(hammer_transaction_t trans, hammer_inode_t ip,
 156                       struct hammer_ioc_history *hist)
 157 {
 158         struct hammer_cursor cursor;
 159         hammer_btree_elm_t elm;
 160         int error;
 161
 162         /*
 163          * Validate the structure and initialize for return.
 164          */
 165         if (hist->beg_tid > hist->end_tid)
 166                 return(EINVAL);
 167         if (hist->head.flags & HAMMER_IOC_HISTORY_ATKEY) {
 168                 if (hist->key > hist->nxt_key)
 169                         return(EINVAL);
 170         }
 171
 172         hist->obj_id = ip->obj_id;
 173         hist->count = 0;
 174         hist->nxt_tid = hist->end_tid;
 175         hist->head.flags &= ~HAMMER_IOC_HISTORY_NEXT_TID;
 176         hist->head.flags &= ~HAMMER_IOC_HISTORY_NEXT_KEY;
 177         hist->head.flags &= ~HAMMER_IOC_HISTORY_EOF;
 178         hist->head.flags &= ~HAMMER_IOC_HISTORY_UNSYNCED;
 179         if ((ip->flags & HAMMER_INODE_MODMASK) &
 180             ~(HAMMER_INODE_ATIME | HAMMER_INODE_MTIME)) {
 181                 hist->head.flags |= HAMMER_IOC_HISTORY_UNSYNCED;
 182         }
 183
 184         /*
 185          * Setup the cursor.  We can't handle undeletable records
 186          * (create_tid of 0) at the moment.  A create_tid of 0 has
 187          * a special meaning and cannot be specified in the cursor.
 188          */
 189         error = hammer_init_cursor(trans, &cursor, &ip->cache[0], NULL);
 190         if (error) {
 191                 hammer_done_cursor(&cursor);
 192                 return(error);
 193         }
 194
 195         cursor.key_beg.obj_id = hist->obj_id;
 196         cursor.key_beg.create_tid = hist->beg_tid;
 197         cursor.key_beg.delete_tid = 0;
 198         cursor.key_beg.obj_type = 0;
 199         if (cursor.key_beg.create_tid == HAMMER_MIN_TID)
 200                 cursor.key_beg.create_tid = 1;
 201
 202         cursor.key_end.obj_id = hist->obj_id;
 203         cursor.key_end.create_tid = hist->end_tid;
 204         cursor.key_end.delete_tid = 0;
 205         cursor.key_end.obj_type = 0;
 206
 207         cursor.flags |= HAMMER_CURSOR_END_EXCLUSIVE;
 208
 209         if (hist->head.flags & HAMMER_IOC_HISTORY_ATKEY) {
 210                 /*
 211                  * key-range within the file.  For a regular file the
 212                  * on-disk key represents BASE+LEN, not BASE, so the
 213                  * first possible record containing the offset 'key'
 214                  * has an on-disk key of (key + 1).
 215                  */
 216                 cursor.key_beg.key = hist->key;
 217                 cursor.key_end.key = HAMMER_MAX_KEY;
 218                 cursor.key_beg.localization = ip->obj_localization +
 219                                               HAMMER_LOCALIZE_MISC;
 220                 cursor.key_end.localization = ip->obj_localization +
 221                                               HAMMER_LOCALIZE_MISC;
 222
 223                 switch(ip->ino_data.obj_type) {
 224                 case HAMMER_OBJTYPE_REGFILE:
 225                         ++cursor.key_beg.key;
 226                         cursor.key_beg.rec_type = HAMMER_RECTYPE_DATA;
 227                         break;
 228                 case HAMMER_OBJTYPE_DIRECTORY:
 229                         cursor.key_beg.rec_type = HAMMER_RECTYPE_DIRENTRY;
 230                         break;
 231                 case HAMMER_OBJTYPE_DBFILE:
 232                         cursor.key_beg.rec_type = HAMMER_RECTYPE_DB;
 233                         break;
 234                 default:
 235                         error = EINVAL;
 236                         break;
 237                 }
 238                 cursor.key_end.rec_type = cursor.key_beg.rec_type;
 239         } else {
 240                 /*
 241                  * The inode itself.
 242                  */
 243                 cursor.key_beg.key = 0;
 244                 cursor.key_end.key = 0;
 245                 cursor.key_beg.rec_type = HAMMER_RECTYPE_INODE;
 246                 cursor.key_end.rec_type = HAMMER_RECTYPE_INODE;
 247                 cursor.key_beg.localization = ip->obj_localization +
 248                                               HAMMER_LOCALIZE_INODE;
 249                 cursor.key_end.localization = ip->obj_localization +
 250                                               HAMMER_LOCALIZE_INODE;
 251         }
 252
 253         error = hammer_btree_first(&cursor);
 254         while (error == 0) {
 255                 elm = &cursor.node->ondisk->elms[cursor.index];
 256
 257                 add_history(ip, hist, elm);
 258                 if (hist->head.flags & (HAMMER_IOC_HISTORY_NEXT_TID |
 259                                         HAMMER_IOC_HISTORY_NEXT_KEY |
 260                                         HAMMER_IOC_HISTORY_EOF)) {
 261                         break;
 262                 }
 263                 error = hammer_btree_iterate(&cursor);
 264         }
 265         if (error == ENOENT) {
 266                 hist->head.flags |= HAMMER_IOC_HISTORY_EOF;
 267                 error = 0;
 268         }
 269         hammer_done_cursor(&cursor);
 270         return(error);
 271 }
 272
 273 /*
 274  * Add the scanned element to the ioctl return structure.  Some special
 275  * casing is required for regular files to accomodate how data ranges are
 276  * stored on-disk.
 277  */
 278 static void
 279 add_history(hammer_inode_t ip, struct hammer_ioc_history *hist,
 280             hammer_btree_elm_t elm)
 281 {
 282         int i;
 283
 284         if (elm->base.btype != HAMMER_BTREE_TYPE_RECORD)
 285                 return;
 286         if ((hist->head.flags & HAMMER_IOC_HISTORY_ATKEY) &&
 287             ip->ino_data.obj_type == HAMMER_OBJTYPE_REGFILE) {
 288                 /*
 289                  * Adjust nxt_key
 290                  */
 291                 if (hist->nxt_key > elm->leaf.base.key - elm->leaf.data_len &&
 292                     hist->key < elm->leaf.base.key - elm->leaf.data_len) {
 293                         hist->nxt_key = elm->leaf.base.key - elm->leaf.data_len;
 294                 }
 295                 if (hist->nxt_key > elm->leaf.base.key)
 296                         hist->nxt_key = elm->leaf.base.key;
 297
 298                 /*
 299                  * Record is beyond MAXPHYS, there won't be any more records
 300                  * in the iteration covering the requested offset (key).
 301                  */
 302                 if (elm->leaf.base.key >= MAXPHYS &&
 303                     elm->leaf.base.key - MAXPHYS > hist->key) {
 304                         hist->head.flags |= HAMMER_IOC_HISTORY_NEXT_KEY;
 305                 }
 306
 307                 /*
 308                  * Data-range of record does not cover the key.
 309                  */
 310                 if (elm->leaf.base.key - elm->leaf.data_len > hist->key)
 311                         return;
 312
 313         } else if (hist->head.flags & HAMMER_IOC_HISTORY_ATKEY) {
 314                 /*
 315                  * Adjust nxt_key
 316                  */
 317                 if (hist->nxt_key > elm->leaf.base.key &&
 318                     hist->key < elm->leaf.base.key) {
 319                         hist->nxt_key = elm->leaf.base.key;
 320                 }
 321
 322                 /*
 323                  * Record is beyond the requested key.
 324                  */
 325                 if (elm->leaf.base.key > hist->key)
 326                         hist->head.flags |= HAMMER_IOC_HISTORY_NEXT_KEY;
 327         }
 328
 329         /*
 330          * Add create_tid if it is in-bounds.
 331          */
 332         i = hist->count;
 333         if ((i == 0 ||
 334              elm->leaf.base.create_tid != hist->hist_ary[i - 1].tid) &&
 335             elm->leaf.base.create_tid >= hist->beg_tid &&
 336             elm->leaf.base.create_tid < hist->end_tid) {
 337                 if (hist->count == HAMMER_MAX_HISTORY_ELMS) {
 338                         hist->nxt_tid = elm->leaf.base.create_tid;
 339                         hist->head.flags |= HAMMER_IOC_HISTORY_NEXT_TID;
 340                         return;
 341                 }
 342                 hist->hist_ary[i].tid = elm->leaf.base.create_tid;
 343                 hist->hist_ary[i].time32 = elm->leaf.create_ts;
 344                 ++hist->count;
 345         }
 346
 347         /*
 348          * Add delete_tid if it is in-bounds.  Note that different portions
 349          * of the history may have overlapping data ranges with different
 350          * delete_tid's.  If this case occurs the delete_tid may match the
 351          * create_tid of a following record.  XXX
 352          *
 353          *      [        ]
 354          *            [     ]
 355          */
 356         i = hist->count;
 357         if (elm->leaf.base.delete_tid &&
 358             elm->leaf.base.delete_tid >= hist->beg_tid &&
 359             elm->leaf.base.delete_tid < hist->end_tid) {
 360                 if (i == HAMMER_MAX_HISTORY_ELMS) {
 361                         hist->nxt_tid = elm->leaf.base.delete_tid;
 362                         hist->head.flags |= HAMMER_IOC_HISTORY_NEXT_TID;
 363                         return;
 364                 }
 365                 hist->hist_ary[i].tid = elm->leaf.base.delete_tid;
 366                 hist->hist_ary[i].time32 = elm->leaf.delete_ts;
 367                 ++hist->count;
 368         }
 369 }
 370
 371 /*
 372  * Acquire synchronization TID
 373  */
 374 static
 375 int
 376 hammer_ioc_synctid(hammer_transaction_t trans, hammer_inode_t ip,
 377                    struct hammer_ioc_synctid *std)
 378 {
 379         hammer_mount_t hmp = ip->hmp;
 380         int error = 0;
 381
 382         switch(std->op) {
 383         case HAMMER_SYNCTID_NONE:
 384                 std->tid = hmp->flusher.tid;    /* inaccurate */
 385                 break;
 386         case HAMMER_SYNCTID_ASYNC:
 387                 hammer_queue_inodes_flusher(hmp, MNT_NOWAIT);
 388                 hammer_flusher_async(hmp, NULL);
 389                 std->tid = hmp->flusher.tid;    /* inaccurate */
 390                 break;
 391         case HAMMER_SYNCTID_SYNC1:
 392                 hammer_queue_inodes_flusher(hmp, MNT_WAIT);
 393                 hammer_flusher_sync(hmp);
 394                 std->tid = hmp->flusher.tid;
 395                 break;
 396         case HAMMER_SYNCTID_SYNC2:
 397                 hammer_queue_inodes_flusher(hmp, MNT_WAIT);
 398                 hammer_flusher_sync(hmp);
 399                 std->tid = hmp->flusher.tid;
 400                 hammer_flusher_sync(hmp);
 401                 break;
 402         default:
 403                 error = EOPNOTSUPP;
 404                 break;
 405         }
 406         return(error);
 407 }
 408
 409 /*
 410  * Retrieve version info.
 411  *
 412  * Load min_version, wip_version, and max_versino.  If cur_version is passed
 413  * as 0 then load the current version into cur_version.  Load the description
 414  * for cur_version into the description array.
 415  *
 416  * Returns 0 on success, EINVAL if cur_version is non-zero and set to an
 417  * unsupported value.
 418  */
 419 static
 420 int
 421 hammer_ioc_get_version(hammer_transaction_t trans, hammer_inode_t ip,
 422                    struct hammer_ioc_version *ver)
 423 {
 424         int error = 0;
 425
 426         ver->min_version = HAMMER_VOL_VERSION_MIN;
 427         ver->wip_version = HAMMER_VOL_VERSION_WIP;
 428         ver->max_version = HAMMER_VOL_VERSION_MAX;
 429         if (ver->cur_version == 0)
 430                 ver->cur_version = trans->hmp->version;
 431         switch(ver->cur_version) {
 432         case 1:
 433                 ksnprintf(ver->description, sizeof(ver->description),
 434                          "2.0 - First HAMMER release");
 435                 break;
 436         case 2:
 437                 ksnprintf(ver->description, sizeof(ver->description),
 438                          "2.2 - New directory hash");
 439                 break;
 440         default:
 441                 ksnprintf(ver->description, sizeof(ver->description),
 442                          "Unknown");
 443                 error = EINVAL;
 444                 break;
 445         }
 446         return(error);
 447 };
 448
 449 /*
 450  * Set version info
 451  */
 452 static
 453 int
 454 hammer_ioc_set_version(hammer_transaction_t trans, hammer_inode_t ip,
 455                    struct hammer_ioc_version *ver)
 456 {
 457         struct hammer_cursor cursor;
 458         hammer_volume_t volume;
 459         int error;
 460
 461         if (ver->cur_version < trans->hmp->version)
 462                 return(EINVAL);
 463         if (ver->cur_version == trans->hmp->version)
 464                 return(0);
 465         if (ver->cur_version > HAMMER_VOL_VERSION_MAX)
 466                 return(EINVAL);
 467         if (trans->hmp->ronly)
 468                 return(EROFS);
 469
 470         /*
 471          * Update the root volume header and the version cached in
 472          * the hammer_mount structure.
 473          */
 474         error = hammer_init_cursor(trans, &cursor, NULL, NULL);
 475         if (error)
 476                 goto failed;
 477         hammer_sync_lock_sh(trans);
 478
 479         volume = hammer_get_root_volume(cursor.trans->hmp, &error);
 480         KKASSERT(error == 0);
 481         hammer_modify_volume_field(cursor.trans, volume, vol_version);
 482         volume->ondisk->vol_version = ver->cur_version;
 483         cursor.trans->hmp->version = ver->cur_version;
 484         hammer_modify_volume_done(volume);
 485         hammer_rel_volume(volume, 0);
 486
 487         hammer_sync_unlock(trans);
 488 failed:
 489         ver->head.error = error;
 490         hammer_done_cursor(&cursor);
 491         return(0);
 492 }
 493
 494
 495