lib/ext2fs/extent.c

   1 /*
   2  * extent.c --- routines to implement extents support
   3  *
   4  * Copyright (C) 2007 Theodore Ts'o.
   5  *
   6  * %Begin-Header%
   7  * This file may be redistributed under the terms of the GNU Library
   8  * General Public License, version 2.
   9  * %End-Header%
  10  */
  11
  12 #include "config.h"
  13 #include <stdio.h>
  14 #include <string.h>
  15 #if HAVE_UNISTD_H
  16 #include <unistd.h>
  17 #endif
  18 #if HAVE_ERRNO_H
  19 #include <errno.h>
  20 #endif
  21 #if HAVE_SYS_STAT_H
  22 #include <sys/stat.h>
  23 #endif
  24 #if HAVE_SYS_TYPES_H
  25 #include <sys/types.h>
  26 #endif
  27
  28 #include "ext2_fs.h"
  29 #include "ext2fsP.h"
  30 #include "e2image.h"
  31
  32 /*
  33  * Definitions to be dropped in lib/ext2fs/ext2fs.h
  34  */
  35
  36 /*
  37  * Private definitions
  38  */
  39
  40 struct extent_path {
  41         char            *buf;
  42         int             entries;
  43         int             max_entries;
  44         int             left;
  45         int             visit_num;
  46         int             flags;
  47         blk64_t         end_blk;
  48         void            *curr;
  49 };
  50
  51
  52 struct ext2_extent_handle {
  53         errcode_t               magic;
  54         ext2_filsys             fs;
  55         ext2_ino_t              ino;
  56         struct ext2_inode       *inode;
  57         struct ext2_inode       inodebuf;
  58         int                     type;
  59         int                     level;
  60         int                     max_depth;
  61         struct extent_path      *path;
  62 };
  63
  64 struct ext2_extent_path {
  65         errcode_t               magic;
  66         int                     leaf_height;
  67         blk64_t                 lblk;
  68 };
  69
  70 /*
  71  *  Useful Debugging stuff
  72  */
  73
  74 #ifdef DEBUG
  75 static void dbg_show_header(struct ext3_extent_header *eh)
  76 {
  77         printf("header: magic=%x entries=%u max=%u depth=%u generation=%u\n",
  78                         ext2fs_le16_to_cpu(eh->eh_magic),
  79                         ext2fs_le16_to_cpu(eh->eh_entries),
  80                         ext2fs_le16_to_cpu(eh->eh_max),
  81                         ext2fs_le16_to_cpu(eh->eh_depth),
  82                         ext2fs_le32_to_cpu(eh->eh_generation));
  83 }
  84
  85 static void dbg_show_index(struct ext3_extent_idx *ix)
  86 {
  87         printf("index: block=%u leaf=%u leaf_hi=%u unused=%u\n",
  88                         ext2fs_le32_to_cpu(ix->ei_block),
  89                         ext2fs_le32_to_cpu(ix->ei_leaf),
  90                         ext2fs_le16_to_cpu(ix->ei_leaf_hi),
  91                         ext2fs_le16_to_cpu(ix->ei_unused));
  92 }
  93
  94 static void dbg_show_extent(struct ext3_extent *ex)
  95 {
  96         printf("extent: block=%u-%u len=%u start=%u start_hi=%u\n",
  97                         ext2fs_le32_to_cpu(ex->ee_block),
  98                         ext2fs_le32_to_cpu(ex->ee_block) +
  99                         ext2fs_le16_to_cpu(ex->ee_len) - 1,
 100                         ext2fs_le16_to_cpu(ex->ee_len),
 101                         ext2fs_le32_to_cpu(ex->ee_start),
 102                         ext2fs_le16_to_cpu(ex->ee_start_hi));
 103 }
 104
 105 static void dbg_print_extent(char *desc, struct ext2fs_extent *extent)
 106 {
 107         if (desc)
 108                 printf("%s: ", desc);
 109         printf("extent: lblk %llu--%llu, len %u, pblk %llu, flags: ",
 110                extent->e_lblk, extent->e_lblk + extent->e_len - 1,
 111                extent->e_len, extent->e_pblk);
 112         if (extent->e_flags & EXT2_EXTENT_FLAGS_LEAF)
 113                 fputs("LEAF ", stdout);
 114         if (extent->e_flags & EXT2_EXTENT_FLAGS_UNINIT)
 115                 fputs("UNINIT ", stdout);
 116         if (extent->e_flags & EXT2_EXTENT_FLAGS_SECOND_VISIT)
 117                 fputs("2ND_VISIT ", stdout);
 118         if (!extent->e_flags)
 119                 fputs("(none)", stdout);
 120         fputc('\n', stdout);
 121
 122 }
 123
 124 #else
 125 #define dbg_show_header(eh) do { } while (0)
 126 #define dbg_show_index(ix) do { } while (0)
 127 #define dbg_show_extent(ex) do { } while (0)
 128 #define dbg_print_extent(desc, ex) do { } while (0)
 129 #endif
 130
 131 /*
 132  * Verify the extent header as being sane
 133  */
 134 errcode_t ext2fs_extent_header_verify(void *ptr, int size)
 135 {
 136         int eh_max, entry_size;
 137         struct ext3_extent_header *eh = ptr;
 138
 139         dbg_show_header(eh);
 140         if (ext2fs_le16_to_cpu(eh->eh_magic) != EXT3_EXT_MAGIC)
 141                 return EXT2_ET_EXTENT_HEADER_BAD;
 142         if (ext2fs_le16_to_cpu(eh->eh_entries) > ext2fs_le16_to_cpu(eh->eh_max))
 143                 return EXT2_ET_EXTENT_HEADER_BAD;
 144         if (eh->eh_depth == 0)
 145                 entry_size = sizeof(struct ext3_extent);
 146         else
 147                 entry_size = sizeof(struct ext3_extent_idx);
 148
 149         eh_max = (size - sizeof(*eh)) / entry_size;
 150         /* Allow two extent-sized items at the end of the block, for
 151          * ext4_extent_tail with checksum in the future. */
 152         if ((ext2fs_le16_to_cpu(eh->eh_max) > eh_max) ||
 153             (ext2fs_le16_to_cpu(eh->eh_max) < (eh_max - 2)))
 154                 return EXT2_ET_EXTENT_HEADER_BAD;
 155
 156         return 0;
 157 }
 158
 159
 160 /*
 161  * Begin functions to handle an inode's extent information
 162  */
 163 extern void ext2fs_extent_free(ext2_extent_handle_t handle)
 164 {
 165         int                     i;
 166
 167         if (!handle)
 168                 return;
 169
 170         if (handle->path) {
 171                 for (i=1; i <= handle->max_depth; i++) {
 172                         if (handle->path[i].buf)
 173                                 ext2fs_free_mem(&handle->path[i].buf);
 174                 }
 175                 ext2fs_free_mem(&handle->path);
 176         }
 177         ext2fs_free_mem(&handle);
 178 }
 179
 180 extern errcode_t ext2fs_extent_open(ext2_filsys fs, ext2_ino_t ino,
 181                                     ext2_extent_handle_t *ret_handle)
 182 {
 183         return ext2fs_extent_open2(fs, ino, NULL, ret_handle);
 184 }
 185
 186 extern errcode_t ext2fs_extent_open2(ext2_filsys fs, ext2_ino_t ino,
 187                                     struct ext2_inode *inode,
 188                                     ext2_extent_handle_t *ret_handle)
 189 {
 190         struct ext2_extent_handle       *handle;
 191         errcode_t                       retval;
 192         int                             i;
 193         struct ext3_extent_header       *eh;
 194
 195         EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
 196
 197         if (!inode)
 198                 if ((ino == 0) || (ino > fs->super->s_inodes_count))
 199                         return EXT2_ET_BAD_INODE_NUM;
 200
 201         retval = ext2fs_get_mem(sizeof(struct ext2_extent_handle), &handle);
 202         if (retval)
 203                 return retval;
 204         memset(handle, 0, sizeof(struct ext2_extent_handle));
 205
 206         handle->ino = ino;
 207         handle->fs = fs;
 208
 209         if (inode) {
 210                 handle->inode = inode;
 211         } else {
 212                 handle->inode = &handle->inodebuf;
 213                 retval = ext2fs_read_inode(fs, ino, handle->inode);
 214                 if (retval)
 215                         goto errout;
 216         }
 217
 218         eh = (struct ext3_extent_header *) &handle->inode->i_block[0];
 219
 220         for (i=0; i < EXT2_N_BLOCKS; i++)
 221                 if (handle->inode->i_block[i])
 222                         break;
 223         if (i >= EXT2_N_BLOCKS) {
 224                 eh->eh_magic = ext2fs_cpu_to_le16(EXT3_EXT_MAGIC);
 225                 eh->eh_depth = 0;
 226                 eh->eh_entries = 0;
 227                 i = (sizeof(handle->inode->i_block) - sizeof(*eh)) /
 228                         sizeof(struct ext3_extent);
 229                 eh->eh_max = ext2fs_cpu_to_le16(i);
 230                 handle->inode->i_flags |= EXT4_EXTENTS_FL;
 231         }
 232
 233         if (!(handle->inode->i_flags & EXT4_EXTENTS_FL)) {
 234                 retval = EXT2_ET_INODE_NOT_EXTENT;
 235                 goto errout;
 236         }
 237
 238         retval = ext2fs_extent_header_verify(eh, sizeof(handle->inode->i_block));
 239         if (retval)
 240                 goto errout;
 241
 242         handle->max_depth = ext2fs_le16_to_cpu(eh->eh_depth);
 243         handle->type = ext2fs_le16_to_cpu(eh->eh_magic);
 244
 245         retval = ext2fs_get_mem(((handle->max_depth+1) *
 246                                  sizeof(struct extent_path)),
 247                                 &handle->path);
 248         memset(handle->path, 0,
 249                (handle->max_depth+1) * sizeof(struct extent_path));
 250         handle->path[0].buf = (char *) handle->inode->i_block;
 251
 252         handle->path[0].left = handle->path[0].entries =
 253                 ext2fs_le16_to_cpu(eh->eh_entries);
 254         handle->path[0].max_entries = ext2fs_le16_to_cpu(eh->eh_max);
 255         handle->path[0].curr = 0;
 256         handle->path[0].end_blk =
 257                 (EXT2_I_SIZE(handle->inode) + fs->blocksize - 1) >>
 258                  EXT2_BLOCK_SIZE_BITS(fs->super);
 259         handle->path[0].visit_num = 1;
 260         handle->level = 0;
 261         handle->magic = EXT2_ET_MAGIC_EXTENT_HANDLE;
 262
 263         *ret_handle = handle;
 264         return 0;
 265
 266 errout:
 267         ext2fs_extent_free(handle);
 268         return retval;
 269 }
 270
 271 /*
 272  * This function is responsible for (optionally) moving through the
 273  * extent tree and then returning the current extent
 274  */
 275 errcode_t ext2fs_extent_get(ext2_extent_handle_t handle,
 276                             int flags, struct ext2fs_extent *extent)
 277 {
 278         struct extent_path      *path, *newpath;
 279         struct ext3_extent_header       *eh;
 280         struct ext3_extent_idx          *ix = 0;
 281         struct ext3_extent              *ex;
 282         errcode_t                       retval;
 283         blk64_t                         blk;
 284         blk64_t                         end_blk;
 285         int                             orig_op, op;
 286
 287         EXT2_CHECK_MAGIC(handle, EXT2_ET_MAGIC_EXTENT_HANDLE);
 288
 289         if (!handle->path)
 290                 return EXT2_ET_NO_CURRENT_NODE;
 291
 292         orig_op = op = flags & EXT2_EXTENT_MOVE_MASK;
 293
 294 retry:
 295         path = handle->path + handle->level;
 296         if ((orig_op == EXT2_EXTENT_NEXT) ||
 297             (orig_op == EXT2_EXTENT_NEXT_LEAF)) {
 298                 if (handle->level < handle->max_depth) {
 299                         /* interior node */
 300                         if (path->visit_num == 0) {
 301                                 path->visit_num++;
 302                                 op = EXT2_EXTENT_DOWN;
 303                         } else if (path->left > 0)
 304                                 op = EXT2_EXTENT_NEXT_SIB;
 305                         else if (handle->level > 0)
 306                                 op = EXT2_EXTENT_UP;
 307                         else
 308                                 return EXT2_ET_EXTENT_NO_NEXT;
 309                 } else {
 310                         /* leaf node */
 311                         if (path->left > 0)
 312                                 op = EXT2_EXTENT_NEXT_SIB;
 313                         else if (handle->level > 0)
 314                                 op = EXT2_EXTENT_UP;
 315                         else
 316                                 return EXT2_ET_EXTENT_NO_NEXT;
 317                 }
 318                 if (op != EXT2_EXTENT_NEXT_SIB) {
 319 #ifdef DEBUG_GET_EXTENT
 320                         printf("<<<< OP = %s\n",
 321                                (op == EXT2_EXTENT_DOWN) ? "down" :
 322                                ((op == EXT2_EXTENT_UP) ? "up" : "unknown"));
 323 #endif
 324                 }
 325         }
 326
 327         if ((orig_op == EXT2_EXTENT_PREV) ||
 328             (orig_op == EXT2_EXTENT_PREV_LEAF)) {
 329                 if (handle->level < handle->max_depth) {
 330                         /* interior node */
 331                         if (path->visit_num > 0 ) {
 332                                 /* path->visit_num = 0; */
 333                                 op = EXT2_EXTENT_DOWN_AND_LAST;
 334                         } else if (path->left < path->entries-1)
 335                                 op = EXT2_EXTENT_PREV_SIB;
 336                         else if (handle->level > 0)
 337                                 op = EXT2_EXTENT_UP;
 338                         else
 339                                 return EXT2_ET_EXTENT_NO_PREV;
 340                 } else {
 341                         /* leaf node */
 342                         if (path->left < path->entries-1)
 343                                 op = EXT2_EXTENT_PREV_SIB;
 344                         else if (handle->level > 0)
 345                                 op = EXT2_EXTENT_UP;
 346                         else
 347                                 return EXT2_ET_EXTENT_NO_PREV;
 348                 }
 349                 if (op != EXT2_EXTENT_PREV_SIB) {
 350 #ifdef DEBUG_GET_EXTENT
 351                         printf("<<<< OP = %s\n",
 352                                (op == EXT2_EXTENT_DOWN_AND_LAST) ? "down/last" :
 353                                ((op == EXT2_EXTENT_UP) ? "up" : "unknown"));
 354 #endif
 355                 }
 356         }
 357
 358         if (orig_op == EXT2_EXTENT_LAST_LEAF) {
 359                 if ((handle->level < handle->max_depth) &&
 360                     (path->left == 0))
 361                         op = EXT2_EXTENT_DOWN;
 362                 else
 363                         op = EXT2_EXTENT_LAST_SIB;
 364 #ifdef DEBUG_GET_EXTENT
 365                 printf("<<<< OP = %s\n",
 366                            (op == EXT2_EXTENT_DOWN) ? "down" : "last_sib");
 367 #endif
 368         }
 369
 370         switch (op) {
 371         case EXT2_EXTENT_CURRENT:
 372                 ix = path->curr;
 373                 break;
 374         case EXT2_EXTENT_ROOT:
 375                 handle->level = 0;
 376                 path = handle->path + handle->level;
 377                 /* fallthrough */
 378         case EXT2_EXTENT_FIRST_SIB:
 379                 path->left = path->entries;
 380                 path->curr = 0;
 381                 /* fallthrough */
 382         case EXT2_EXTENT_NEXT_SIB:
 383                 if (path->left <= 0)
 384                         return EXT2_ET_EXTENT_NO_NEXT;
 385                 if (path->curr) {
 386                         ix = path->curr;
 387                         ix++;
 388                 } else {
 389                         eh = (struct ext3_extent_header *) path->buf;
 390                         ix = EXT_FIRST_INDEX(eh);
 391                 }
 392                 path->left--;
 393                 path->curr = ix;
 394                 path->visit_num = 0;
 395                 break;
 396         case EXT2_EXTENT_PREV_SIB:
 397                 if (!path->curr ||
 398                     path->left+1 >= path->entries)
 399                         return EXT2_ET_EXTENT_NO_PREV;
 400                 ix = path->curr;
 401                 ix--;
 402                 path->curr = ix;
 403                 path->left++;
 404                 if (handle->level < handle->max_depth)
 405                         path->visit_num = 1;
 406                 break;
 407         case EXT2_EXTENT_LAST_SIB:
 408                 eh = (struct ext3_extent_header *) path->buf;
 409                 path->curr = EXT_LAST_EXTENT(eh);
 410                 ix = path->curr;
 411                 path->left = 0;
 412                 path->visit_num = 0;
 413                 break;
 414         case EXT2_EXTENT_UP:
 415                 if (handle->level <= 0)
 416                         return EXT2_ET_EXTENT_NO_UP;
 417                 handle->level--;
 418                 path--;
 419                 ix = path->curr;
 420                 if ((orig_op == EXT2_EXTENT_PREV) ||
 421                     (orig_op == EXT2_EXTENT_PREV_LEAF))
 422                         path->visit_num = 0;
 423                 break;
 424         case EXT2_EXTENT_DOWN:
 425         case EXT2_EXTENT_DOWN_AND_LAST:
 426                 if (!path->curr ||(handle->level >= handle->max_depth))
 427                         return EXT2_ET_EXTENT_NO_DOWN;
 428
 429                 ix = path->curr;
 430                 newpath = path + 1;
 431                 if (!newpath->buf) {
 432                         retval = ext2fs_get_mem(handle->fs->blocksize,
 433                                                 &newpath->buf);
 434                         if (retval)
 435                                 return retval;
 436                 }
 437                 blk = ext2fs_le32_to_cpu(ix->ei_leaf) +
 438                         ((__u64) ext2fs_le16_to_cpu(ix->ei_leaf_hi) << 32);
 439                 if ((handle->fs->flags & EXT2_FLAG_IMAGE_FILE) &&
 440                     (handle->fs->io != handle->fs->image_io))
 441                         memset(newpath->buf, 0, handle->fs->blocksize);
 442                 else {
 443                         retval = io_channel_read_blk64(handle->fs->io,
 444                                                      blk, 1, newpath->buf);
 445                         if (retval)
 446                                 return retval;
 447                 }
 448                 handle->level++;
 449
 450                 eh = (struct ext3_extent_header *) newpath->buf;
 451
 452                 retval = ext2fs_extent_header_verify(eh, handle->fs->blocksize);
 453                 if (retval) {
 454                         handle->level--;
 455                         return retval;
 456                 }
 457
 458                 newpath->left = newpath->entries =
 459                         ext2fs_le16_to_cpu(eh->eh_entries);
 460                 newpath->max_entries = ext2fs_le16_to_cpu(eh->eh_max);
 461
 462                 if (path->left > 0) {
 463                         ix++;
 464                         newpath->end_blk = ext2fs_le32_to_cpu(ix->ei_block);
 465                 } else
 466                         newpath->end_blk = path->end_blk;
 467
 468                 path = newpath;
 469                 if (op == EXT2_EXTENT_DOWN) {
 470                         ix = EXT_FIRST_INDEX((struct ext3_extent_header *) eh);
 471                         path->curr = ix;
 472                         path->left = path->entries - 1;
 473                         path->visit_num = 0;
 474                 } else {
 475                         ix = EXT_LAST_INDEX((struct ext3_extent_header *) eh);
 476                         path->curr = ix;
 477                         path->left = 0;
 478                         if (handle->level < handle->max_depth)
 479                                 path->visit_num = 1;
 480                 }
 481 #ifdef DEBUG_GET_EXTENT
 482                 printf("Down to level %d/%d, end_blk=%llu\n",
 483                            handle->level, handle->max_depth,
 484                            path->end_blk);
 485 #endif
 486                 break;
 487         default:
 488                 return EXT2_ET_OP_NOT_SUPPORTED;
 489         }
 490
 491         if (!ix)
 492                 return EXT2_ET_NO_CURRENT_NODE;
 493
 494         extent->e_flags = 0;
 495 #ifdef DEBUG_GET_EXTENT
 496         printf("(Left %d)\n", path->left);
 497 #endif
 498
 499         if (handle->level == handle->max_depth) {
 500                 ex = (struct ext3_extent *) ix;
 501
 502                 extent->e_pblk = ext2fs_le32_to_cpu(ex->ee_start) +
 503                         ((__u64) ext2fs_le16_to_cpu(ex->ee_start_hi) << 32);
 504                 extent->e_lblk = ext2fs_le32_to_cpu(ex->ee_block);
 505                 extent->e_len = ext2fs_le16_to_cpu(ex->ee_len);
 506                 extent->e_flags |= EXT2_EXTENT_FLAGS_LEAF;
 507                 if (extent->e_len > EXT_INIT_MAX_LEN) {
 508                         extent->e_len -= EXT_INIT_MAX_LEN;
 509                         extent->e_flags |= EXT2_EXTENT_FLAGS_UNINIT;
 510                 }
 511         } else {
 512                 extent->e_pblk = ext2fs_le32_to_cpu(ix->ei_leaf) +
 513                         ((__u64) ext2fs_le16_to_cpu(ix->ei_leaf_hi) << 32);
 514                 extent->e_lblk = ext2fs_le32_to_cpu(ix->ei_block);
 515                 if (path->left > 0) {
 516                         ix++;
 517                         end_blk = ext2fs_le32_to_cpu(ix->ei_block);
 518                 } else
 519                         end_blk = path->end_blk;
 520
 521                 extent->e_len = end_blk - extent->e_lblk;
 522         }
 523         if (path->visit_num)
 524                 extent->e_flags |= EXT2_EXTENT_FLAGS_SECOND_VISIT;
 525
 526         if (((orig_op == EXT2_EXTENT_NEXT_LEAF) ||
 527              (orig_op == EXT2_EXTENT_PREV_LEAF)) &&
 528             (handle->level != handle->max_depth))
 529                 goto retry;
 530
 531         if ((orig_op == EXT2_EXTENT_LAST_LEAF) &&
 532             ((handle->level != handle->max_depth) ||
 533              (path->left != 0)))
 534                 goto retry;
 535
 536         return 0;
 537 }
 538
 539 static errcode_t update_path(ext2_extent_handle_t handle)
 540 {
 541         blk64_t                         blk;
 542         errcode_t                       retval;
 543         struct ext3_extent_idx          *ix;
 544
 545         if (handle->level == 0) {
 546                 retval = ext2fs_write_inode(handle->fs, handle->ino,
 547                                             handle->inode);
 548         } else {
 549                 ix = handle->path[handle->level - 1].curr;
 550                 blk = ext2fs_le32_to_cpu(ix->ei_leaf) +
 551                         ((__u64) ext2fs_le16_to_cpu(ix->ei_leaf_hi) << 32);
 552
 553                 retval = io_channel_write_blk64(handle->fs->io,
 554                                       blk, 1, handle->path[handle->level].buf);
 555         }
 556         return retval;
 557 }
 558
 559 #if 0
 560 errcode_t ext2fs_extent_save_path(ext2_extent_handle_t handle,
 561                                   ext2_extent_path_t *ret_path)
 562 {
 563         ext2_extent_path_t      save_path;
 564         struct ext2fs_extent    extent;
 565         struct ext2_extent_info info;
 566         errcode_t               retval;
 567
 568         retval = ext2fs_extent_get(handle, EXT2_EXTENT_CURRENT, &extent);
 569         if (retval)
 570                 return retval;
 571
 572         retval = ext2fs_extent_get_info(handle, &info);
 573         if (retval)
 574                 return retval;
 575
 576         retval = ext2fs_get_mem(sizeof(struct ext2_extent_path), &save_path);
 577         if (retval)
 578                 return retval;
 579         memset(save_path, 0, sizeof(struct ext2_extent_path));
 580
 581         save_path->magic = EXT2_ET_MAGIC_EXTENT_PATH;
 582         save_path->leaf_height = info.max_depth - info.curr_level - 1;
 583         save_path->lblk = extent.e_lblk;
 584
 585         *ret_path = save_path;
 586         return 0;
 587 }
 588
 589 errcode_t ext2fs_extent_free_path(ext2_extent_path_t path)
 590 {
 591         EXT2_CHECK_MAGIC(path, EXT2_ET_MAGIC_EXTENT_PATH);
 592
 593         ext2fs_free_mem(&path);
 594         return 0;
 595 }
 596 #endif
 597
 598 /*
 599  * Go to the node at leaf_level which contains logical block blk.
 600  *
 601  * leaf_level is height from the leaf node level, i.e.
 602  * leaf_level 0 is at leaf node, leaf_level 1 is 1 above etc.
 603  *
 604  * If "blk" has no mapping (hole) then handle is left at last
 605  * extent before blk.
 606  */
 607 static errcode_t extent_goto(ext2_extent_handle_t handle,
 608                              int leaf_level, blk64_t blk)
 609 {
 610         struct ext2fs_extent    extent;
 611         errcode_t               retval;
 612
 613         retval = ext2fs_extent_get(handle, EXT2_EXTENT_ROOT, &extent);
 614         if (retval) {
 615                 if (retval == EXT2_ET_EXTENT_NO_NEXT)
 616                         retval = EXT2_ET_EXTENT_NOT_FOUND;
 617                 return retval;
 618         }
 619
 620         if (leaf_level > handle->max_depth) {
 621 #ifdef DEBUG
 622                 printf("leaf level %d greater than tree depth %d\n",
 623                         leaf_level, handle->max_depth);
 624 #endif
 625                 return EXT2_ET_OP_NOT_SUPPORTED;
 626         }
 627
 628 #ifdef DEBUG
 629         printf("goto extent ino %u, level %d, %llu\n", handle->ino,
 630                leaf_level, blk);
 631 #endif
 632
 633 #ifdef DEBUG_GOTO_EXTENTS
 634         dbg_print_extent("root", &extent);
 635 #endif
 636         while (1) {
 637                 if (handle->max_depth - handle->level == leaf_level) {
 638                         /* block is in this &extent */
 639                         if ((blk >= extent.e_lblk) &&
 640                             (blk < extent.e_lblk + extent.e_len))
 641                                 return 0;
 642                         if (blk < extent.e_lblk) {
 643                                 retval = ext2fs_extent_get(handle,
 644                                                            EXT2_EXTENT_PREV_SIB,
 645                                                            &extent);
 646                                 return EXT2_ET_EXTENT_NOT_FOUND;
 647                         }
 648                         retval = ext2fs_extent_get(handle,
 649                                                    EXT2_EXTENT_NEXT_SIB,
 650                                                    &extent);
 651                         if (retval == EXT2_ET_EXTENT_NO_NEXT)
 652                                 return EXT2_ET_EXTENT_NOT_FOUND;
 653                         if (retval)
 654                                 return retval;
 655                         continue;
 656                 }
 657
 658                 retval = ext2fs_extent_get(handle, EXT2_EXTENT_NEXT_SIB,
 659                                            &extent);
 660                 if (retval == EXT2_ET_EXTENT_NO_NEXT)
 661                         goto go_down;
 662                 if (retval)
 663                         return retval;
 664
 665 #ifdef DEBUG_GOTO_EXTENTS
 666                 dbg_print_extent("next", &extent);
 667 #endif
 668                 if (blk == extent.e_lblk)
 669                         goto go_down;
 670                 if (blk > extent.e_lblk)
 671                         continue;
 672
 673                 retval = ext2fs_extent_get(handle, EXT2_EXTENT_PREV_SIB,
 674                                            &extent);
 675                 if (retval)
 676                         return retval;
 677
 678 #ifdef DEBUG_GOTO_EXTENTS
 679                 dbg_print_extent("prev", &extent);
 680 #endif
 681
 682         go_down:
 683                 retval = ext2fs_extent_get(handle, EXT2_EXTENT_DOWN,
 684                                            &extent);
 685                 if (retval)
 686                         return retval;
 687
 688 #ifdef DEBUG_GOTO_EXTENTS
 689                 dbg_print_extent("down", &extent);
 690 #endif
 691         }
 692 }
 693
 694 errcode_t ext2fs_extent_goto(ext2_extent_handle_t handle,
 695                              blk64_t blk)
 696 {
 697         return extent_goto(handle, 0, blk);
 698 }
 699
 700 /*
 701  * Traverse back up to root fixing parents of current node as needed.
 702  *
 703  * If we changed start of first entry in a node, fix parent index start
 704  * and so on.
 705  *
 706  * Safe to call for any position in node; if not at the first entry,
 707  * will  simply return.
 708  */
 709 static errcode_t ext2fs_extent_fix_parents(ext2_extent_handle_t handle)
 710 {
 711         int                             retval = 0;
 712         blk64_t                         start;
 713         struct extent_path              *path;
 714         struct ext2fs_extent            extent;
 715
 716         EXT2_CHECK_MAGIC(handle, EXT2_ET_MAGIC_EXTENT_HANDLE);
 717
 718         if (!(handle->fs->flags & EXT2_FLAG_RW))
 719                 return EXT2_ET_RO_FILSYS;
 720
 721         if (!handle->path)
 722                 return EXT2_ET_NO_CURRENT_NODE;
 723
 724         path = handle->path + handle->level;
 725         if (!path->curr)
 726                 return EXT2_ET_NO_CURRENT_NODE;
 727
 728         retval = ext2fs_extent_get(handle, EXT2_EXTENT_CURRENT, &extent);
 729         if (retval)
 730                 goto done;
 731
 732         /* modified node's start block */
 733         start = extent.e_lblk;
 734
 735         /* traverse up until index not first, or startblk matches, or top */
 736         while (handle->level > 0 &&
 737                (path->left == path->entries - 1)) {
 738                 retval = ext2fs_extent_get(handle, EXT2_EXTENT_UP, &extent);
 739                 if (retval)
 740                         goto done;
 741                 if (extent.e_lblk == start)
 742                         break;
 743                 path = handle->path + handle->level;
 744                 extent.e_len += (extent.e_lblk - start);
 745                 extent.e_lblk = start;
 746                 retval = ext2fs_extent_replace(handle, 0, &extent);
 747                 if (retval)
 748                         goto done;
 749                 update_path(handle);
 750         }
 751
 752         /* put handle back to where we started */
 753         retval = ext2fs_extent_goto(handle, start);
 754 done:
 755         return retval;
 756 }
 757
 758 errcode_t ext2fs_extent_replace(ext2_extent_handle_t handle,
 759                                 int flags EXT2FS_ATTR((unused)),
 760                                 struct ext2fs_extent *extent)
 761 {
 762         struct extent_path              *path;
 763         struct ext3_extent_idx          *ix;
 764         struct ext3_extent              *ex;
 765
 766         EXT2_CHECK_MAGIC(handle, EXT2_ET_MAGIC_EXTENT_HANDLE);
 767
 768         if (!(handle->fs->flags & EXT2_FLAG_RW))
 769                 return EXT2_ET_RO_FILSYS;
 770
 771         if (!handle->path)
 772                 return EXT2_ET_NO_CURRENT_NODE;
 773
 774         path = handle->path + handle->level;
 775         if (!path->curr)
 776                 return EXT2_ET_NO_CURRENT_NODE;
 777
 778 #ifdef DEBUG
 779         printf("extent replace: %u ", handle->ino);
 780         dbg_print_extent(0, extent);
 781 #endif
 782
 783         if (handle->level == handle->max_depth) {
 784                 ex = path->curr;
 785
 786                 ex->ee_block = ext2fs_cpu_to_le32(extent->e_lblk);
 787                 ex->ee_start = ext2fs_cpu_to_le32(extent->e_pblk & 0xFFFFFFFF);
 788                 ex->ee_start_hi = ext2fs_cpu_to_le16(extent->e_pblk >> 32);
 789                 if (extent->e_flags & EXT2_EXTENT_FLAGS_UNINIT) {
 790                         if (extent->e_len > EXT_UNINIT_MAX_LEN)
 791                                 return EXT2_ET_EXTENT_INVALID_LENGTH;
 792                         ex->ee_len = ext2fs_cpu_to_le16(extent->e_len +
 793                                                         EXT_INIT_MAX_LEN);
 794                 } else {
 795                         if (extent->e_len > EXT_INIT_MAX_LEN)
 796                                 return EXT2_ET_EXTENT_INVALID_LENGTH;
 797                         ex->ee_len = ext2fs_cpu_to_le16(extent->e_len);
 798                 }
 799         } else {
 800                 ix = path->curr;
 801
 802                 ix->ei_leaf = ext2fs_cpu_to_le32(extent->e_pblk & 0xFFFFFFFF);
 803                 ix->ei_leaf_hi = ext2fs_cpu_to_le16(extent->e_pblk >> 32);
 804                 ix->ei_block = ext2fs_cpu_to_le32(extent->e_lblk);
 805                 ix->ei_unused = 0;
 806         }
 807         update_path(handle);
 808         return 0;
 809 }
 810
 811 /*
 812  * allocate a new block, move half the current node to it, and update parent
 813  *
 814  * handle will be left pointing at original record.
 815  */
 816 static errcode_t extent_node_split(ext2_extent_handle_t handle)
 817 {
 818         errcode_t                       retval = 0;
 819         blk64_t                         new_node_pblk;
 820         blk64_t                         new_node_start;
 821         blk64_t                         orig_lblk;
 822         blk64_t                         goal_blk = 0;
 823         int                             orig_height;
 824         char                            *block_buf = NULL;
 825         struct ext2fs_extent            extent;
 826         struct extent_path              *path, *newpath = 0;
 827         struct ext3_extent_header       *eh, *neweh;
 828         int                             tocopy;
 829         int                             new_root = 0;
 830         struct ext2_extent_info         info;
 831
 832         /* basic sanity */
 833         EXT2_CHECK_MAGIC(handle, EXT2_ET_MAGIC_EXTENT_HANDLE);
 834
 835         if (!(handle->fs->flags & EXT2_FLAG_RW))
 836                 return EXT2_ET_RO_FILSYS;
 837
 838         if (!handle->path)
 839                 return EXT2_ET_NO_CURRENT_NODE;
 840
 841 #ifdef DEBUG
 842         printf("splitting node at level %d\n", handle->level);
 843 #endif
 844         retval = ext2fs_extent_get(handle, EXT2_EXTENT_CURRENT, &extent);
 845         if (retval)
 846                 goto done;
 847
 848         retval = ext2fs_extent_get_info(handle, &info);
 849         if (retval)
 850                 goto done;
 851
 852         /* save the position we were originally splitting... */
 853         orig_height = info.max_depth - info.curr_level;
 854         orig_lblk = extent.e_lblk;
 855
 856         /* Is there room in the parent for a new entry? */
 857         if (handle->level &&
 858                         (handle->path[handle->level - 1].entries >=
 859                          handle->path[handle->level - 1].max_entries)) {
 860
 861 #ifdef DEBUG
 862                 printf("parent level %d full; splitting it too\n",
 863                                                         handle->level - 1);
 864 #endif
 865                 /* split the parent */
 866                 retval = ext2fs_extent_get(handle, EXT2_EXTENT_UP, &extent);
 867                 if (retval)
 868                         goto done;
 869                 goal_blk = extent.e_pblk;
 870
 871                 retval = extent_node_split(handle);
 872                 if (retval)
 873                         goto done;
 874
 875                 /* get handle back to our original split position */
 876                 retval = extent_goto(handle, orig_height, orig_lblk);
 877                 if (retval)
 878                         goto done;
 879         }
 880
 881         /* At this point, parent should have room for this split */
 882         path = handle->path + handle->level;
 883         if (!path->curr)
 884                 return EXT2_ET_NO_CURRENT_NODE;
 885
 886         /* extent header of the current node we'll split */
 887         eh = (struct ext3_extent_header *)path->buf;
 888
 889         /* splitting root level means moving them all out */
 890         if (handle->level == 0) {
 891                 new_root = 1;
 892                 tocopy = ext2fs_le16_to_cpu(eh->eh_entries);
 893                 retval = ext2fs_get_mem(((handle->max_depth+2) *
 894                                          sizeof(struct extent_path)),
 895                                         &newpath);
 896                 if (retval)
 897                         goto done;
 898                 memset(newpath, 0,
 899                        ((handle->max_depth+2) * sizeof(struct extent_path)));
 900         } else {
 901                 tocopy = ext2fs_le16_to_cpu(eh->eh_entries) / 2;
 902         }
 903
 904 #ifdef DEBUG
 905         printf("will copy out %d of %d entries at level %d\n",
 906                                 tocopy, ext2fs_le16_to_cpu(eh->eh_entries),
 907                                 handle->level);
 908 #endif
 909
 910         if (!tocopy) {
 911 #ifdef DEBUG
 912                 printf("Nothing to copy to new block!\n");
 913 #endif
 914                 retval = EXT2_ET_CANT_SPLIT_EXTENT;
 915                 goto done;
 916         }
 917
 918         /* first we need a new block, or can do nothing. */
 919         block_buf = malloc(handle->fs->blocksize);
 920         if (!block_buf) {
 921                 retval = ENOMEM;
 922                 goto done;
 923         }
 924
 925         if (!goal_blk) {
 926                 dgrp_t  group = ext2fs_group_of_ino(handle->fs, handle->ino);
 927                 __u8    log_flex = handle->fs->super->s_log_groups_per_flex;
 928
 929                 if (log_flex)
 930                         group = group & ~((1 << (log_flex)) - 1);
 931                 goal_blk = (group * handle->fs->super->s_blocks_per_group) +
 932                         handle->fs->super->s_first_data_block;
 933         }
 934         retval = ext2fs_alloc_block2(handle->fs, goal_blk, block_buf,
 935                                     &new_node_pblk);
 936         if (retval)
 937                 goto done;
 938
 939 #ifdef DEBUG
 940         printf("will copy to new node at block %lu\n",
 941                (unsigned long) new_node_pblk);
 942 #endif
 943
 944         /* Copy data into new block buffer */
 945         /* First the header for the new block... */
 946         neweh = (struct ext3_extent_header *) block_buf;
 947         memcpy(neweh, eh, sizeof(struct ext3_extent_header));
 948         neweh->eh_entries = ext2fs_cpu_to_le16(tocopy);
 949         neweh->eh_max = ext2fs_cpu_to_le16((handle->fs->blocksize -
 950                          sizeof(struct ext3_extent_header)) /
 951                                 sizeof(struct ext3_extent));
 952
 953         /* then the entries for the new block... */
 954         memcpy(EXT_FIRST_INDEX(neweh),
 955                 EXT_FIRST_INDEX(eh) +
 956                         (ext2fs_le16_to_cpu(eh->eh_entries) - tocopy),
 957                 sizeof(struct ext3_extent_idx) * tocopy);
 958
 959         new_node_start = ext2fs_le32_to_cpu(EXT_FIRST_INDEX(neweh)->ei_block);
 960
 961         /* ...and write the new node block out to disk. */
 962         retval = io_channel_write_blk64(handle->fs->io, new_node_pblk, 1,
 963                                         block_buf);
 964
 965         if (retval)
 966                 goto done;
 967
 968         /* OK! we've created the new node; now adjust the tree */
 969
 970         /* current path now has fewer active entries, we copied some out */
 971         if (handle->level == 0) {
 972                 memcpy(newpath, path,
 973                        sizeof(struct extent_path) * (handle->max_depth+1));
 974                 handle->path = newpath;
 975                 newpath = path;
 976                 path = handle->path;
 977                 path->entries = 1;
 978                 path->left = path->max_entries - 1;
 979                 handle->max_depth++;
 980                 eh->eh_depth = ext2fs_cpu_to_le16(handle->max_depth);
 981         } else {
 982                 path->entries -= tocopy;
 983                 path->left -= tocopy;
 984         }
 985
 986         eh->eh_entries = ext2fs_cpu_to_le16(path->entries);
 987         /* this writes out the node, incl. the modified header */
 988         retval = update_path(handle);
 989         if (retval)
 990                 goto done;
 991
 992         /* now go up and insert/replace index for new node we created */
 993         if (new_root) {
 994                 retval = ext2fs_extent_get(handle, EXT2_EXTENT_FIRST_SIB, &extent);
 995                 if (retval)
 996                         goto done;
 997
 998                 extent.e_lblk = new_node_start;
 999                 extent.e_pblk = new_node_pblk;
1000                 extent.e_len = handle->path[0].end_blk - extent.e_lblk;
1001                 retval = ext2fs_extent_replace(handle, 0, &extent);
1002                 if (retval)
1003                         goto done;
1004         } else {
1005                 __u32 new_node_length;
1006
1007                 retval = ext2fs_extent_get(handle, EXT2_EXTENT_UP, &extent);
1008                 /* will insert after this one; it's length is shorter now */
1009                 new_node_length = new_node_start - extent.e_lblk;
1010                 extent.e_len -= new_node_length;
1011                 retval = ext2fs_extent_replace(handle, 0, &extent);
1012                 if (retval)
1013                         goto done;
1014
1015                 /* now set up the new extent and insert it */
1016                 extent.e_lblk = new_node_start;
1017                 extent.e_pblk = new_node_pblk;
1018                 extent.e_len = new_node_length;
1019                 retval = ext2fs_extent_insert(handle, EXT2_EXTENT_INSERT_AFTER, &extent);
1020                 if (retval)
1021                         goto done;
1022         }
1023
1024         /* get handle back to our original position */
1025         retval = extent_goto(handle, orig_height, orig_lblk);
1026         if (retval)
1027                 goto done;
1028
1029         /* new node hooked in, so update inode block count (do this here?) */
1030         handle->inode->i_blocks += (handle->fs->blocksize *
1031                                     EXT2FS_CLUSTER_RATIO(handle->fs)) / 512;
1032         retval = ext2fs_write_inode(handle->fs, handle->ino,
1033                                     handle->inode);
1034         if (retval)
1035                 goto done;
1036
1037 done:
1038         if (newpath)
1039                 ext2fs_free_mem(&newpath);
1040         free(block_buf);
1041
1042         return retval;
1043 }
1044
1045 errcode_t ext2fs_extent_insert(ext2_extent_handle_t handle, int flags,
1046                                       struct ext2fs_extent *extent)
1047 {
1048         struct extent_path              *path;
1049         struct ext3_extent_idx          *ix;
1050         struct ext3_extent_header       *eh;
1051         errcode_t                       retval;
1052
1053         EXT2_CHECK_MAGIC(handle, EXT2_ET_MAGIC_EXTENT_HANDLE);
1054
1055         if (!(handle->fs->flags & EXT2_FLAG_RW))
1056                 return EXT2_ET_RO_FILSYS;
1057
1058         if (!handle->path)
1059                 return EXT2_ET_NO_CURRENT_NODE;
1060
1061 #ifdef DEBUG
1062         printf("extent insert: %u ", handle->ino);
1063         dbg_print_extent(0, extent);
1064 #endif
1065
1066         path = handle->path + handle->level;
1067
1068         if (path->entries >= path->max_entries) {
1069                 if (flags & EXT2_EXTENT_INSERT_NOSPLIT) {
1070                         return EXT2_ET_CANT_INSERT_EXTENT;
1071                 } else {
1072 #ifdef DEBUG
1073                         printf("node full (level %d) - splitting\n",
1074                                    handle->level);
1075 #endif
1076                         retval = extent_node_split(handle);
1077                         if (retval)
1078                                 return retval;
1079                         path = handle->path + handle->level;
1080                 }
1081         }
1082
1083         eh = (struct ext3_extent_header *) path->buf;
1084         if (path->curr) {
1085                 ix = path->curr;
1086                 if (flags & EXT2_EXTENT_INSERT_AFTER) {
1087                         ix++;
1088                         path->left--;
1089                 }
1090         } else
1091                 ix = EXT_FIRST_INDEX(eh);
1092
1093         path->curr = ix;
1094
1095         if (path->left >= 0)
1096                 memmove(ix + 1, ix,
1097                         (path->left+1) * sizeof(struct ext3_extent_idx));
1098         path->left++;
1099         path->entries++;
1100
1101         eh = (struct ext3_extent_header *) path->buf;
1102         eh->eh_entries = ext2fs_cpu_to_le16(path->entries);
1103
1104         retval = ext2fs_extent_replace(handle, 0, extent);
1105         if (retval)
1106                 goto errout;
1107
1108         retval = update_path(handle);
1109         if (retval)
1110                 goto errout;
1111
1112         return 0;
1113
1114 errout:
1115         ext2fs_extent_delete(handle, 0);
1116         return retval;
1117 }
1118
1119 /*
1120  * Sets the physical block for a logical file block in the extent tree.
1121  *
1122  * May: map unmapped, unmap mapped, or remap mapped blocks.
1123  *
1124  * Mapping an unmapped block adds a single-block extent.
1125  *
1126  * Unmapping first or last block modifies extent in-place
1127  *  - But may need to fix parent's starts too in first-block case
1128  *
1129  * Mapping any unmapped block requires adding a (single-block) extent
1130  * and inserting into proper point in tree.
1131  *
1132  * Modifying (unmapping or remapping) a block in the middle
1133  * of an extent requires splitting the extent.
1134  *  - Remapping case requires new single-block extent.
1135  *
1136  * Remapping first or last block adds an extent.
1137  *
1138  * We really need extent adding to be smart about merging.
1139  */
1140
1141 errcode_t ext2fs_extent_set_bmap(ext2_extent_handle_t handle,
1142                                  blk64_t logical, blk64_t physical, int flags)
1143 {
1144         errcode_t               ec, retval = 0;
1145         int                     mapped = 1; /* logical is mapped? */
1146         int                     orig_height;
1147         int                     extent_uninit = 0;
1148         int                     prev_uninit = 0;
1149         int                     next_uninit = 0;
1150         int                     new_uninit = 0;
1151         int                     max_len = EXT_INIT_MAX_LEN;
1152         int                     has_prev, has_next;
1153         blk64_t                 orig_lblk;
1154         struct extent_path      *path;
1155         struct ext2fs_extent    extent, next_extent, prev_extent;
1156         struct ext2fs_extent    newextent;
1157         struct ext2_extent_info info;
1158
1159         EXT2_CHECK_MAGIC(handle, EXT2_ET_MAGIC_EXTENT_HANDLE);
1160
1161 #ifdef DEBUG
1162         printf("set_bmap ino %u log %lld phys %lld flags %d\n",
1163                handle->ino, logical, physical, flags);
1164 #endif
1165
1166         if (!(handle->fs->flags & EXT2_FLAG_RW))
1167                 return EXT2_ET_RO_FILSYS;
1168
1169         if (!handle->path)
1170                 return EXT2_ET_NO_CURRENT_NODE;
1171
1172         path = handle->path + handle->level;
1173
1174         if (flags & EXT2_EXTENT_SET_BMAP_UNINIT) {
1175                 new_uninit = 1;
1176                 max_len = EXT_UNINIT_MAX_LEN;
1177         }
1178
1179         /* if (re)mapping, set up new extent to insert */
1180         if (physical) {
1181                 newextent.e_len = 1;
1182                 newextent.e_pblk = physical;
1183                 newextent.e_lblk = logical;
1184                 newextent.e_flags = EXT2_EXTENT_FLAGS_LEAF;
1185                 if (new_uninit)
1186                         newextent.e_flags |= EXT2_EXTENT_FLAGS_UNINIT;
1187         }
1188
1189         /* special case if the extent tree is completely empty */
1190         if ((handle->max_depth == 0) && (path->entries == 0)) {
1191                 retval = ext2fs_extent_insert(handle, 0, &newextent);
1192                 return retval;
1193         }
1194
1195         /* save our original location in the extent tree */
1196         if ((retval = ext2fs_extent_get(handle, EXT2_EXTENT_CURRENT,
1197                                         &extent))) {
1198                 if (retval != EXT2_ET_NO_CURRENT_NODE)
1199                         return retval;
1200                 memset(&extent, 0, sizeof(extent));
1201         }
1202         if ((retval = ext2fs_extent_get_info(handle, &info)))
1203                 return retval;
1204         orig_height = info.max_depth - info.curr_level;
1205         orig_lblk = extent.e_lblk;
1206
1207         /* go to the logical spot we want to (re/un)map */
1208         retval = ext2fs_extent_goto(handle, logical);
1209         if (retval) {
1210                 if (retval == EXT2_ET_EXTENT_NOT_FOUND) {
1211                         retval = 0;
1212                         mapped = 0;
1213                         if (!physical) {
1214 #ifdef DEBUG
1215                                 printf("block %llu already unmapped\n",
1216                                         logical);
1217 #endif
1218                                 goto done;
1219                         }
1220                 } else
1221                         goto done;
1222         }
1223
1224         /*
1225          * This may be the extent *before* the requested logical,
1226          * if it's currently unmapped.
1227          *
1228          * Get the previous and next leaf extents, if they are present.
1229          */
1230         retval = ext2fs_extent_get(handle, EXT2_EXTENT_CURRENT, &extent);
1231         if (retval)
1232                 goto done;
1233         if (extent.e_flags & EXT2_EXTENT_FLAGS_UNINIT)
1234                 extent_uninit = 1;
1235         retval = ext2fs_extent_get(handle, EXT2_EXTENT_NEXT_LEAF, &next_extent);
1236         if (retval) {
1237                 has_next = 0;
1238                 if (retval != EXT2_ET_EXTENT_NO_NEXT)
1239                         goto done;
1240         } else {
1241                 dbg_print_extent("set_bmap: next_extent",
1242                                  &next_extent);
1243                 has_next = 1;
1244                 if (next_extent.e_flags & EXT2_EXTENT_FLAGS_UNINIT)
1245                         next_uninit = 1;
1246         }
1247         retval = ext2fs_extent_goto(handle, logical);
1248         if (retval && retval != EXT2_ET_EXTENT_NOT_FOUND)
1249                 goto done;
1250         retval = ext2fs_extent_get(handle, EXT2_EXTENT_PREV_LEAF, &prev_extent);
1251         if (retval) {
1252                 has_prev = 0;
1253                 if (retval != EXT2_ET_EXTENT_NO_PREV)
1254                         goto done;
1255         } else {
1256                 has_prev = 1;
1257                 dbg_print_extent("set_bmap: prev_extent",
1258                                  &prev_extent);
1259                 if (prev_extent.e_flags & EXT2_EXTENT_FLAGS_UNINIT)
1260                         prev_uninit = 1;
1261         }
1262         retval = ext2fs_extent_goto(handle, logical);
1263         if (retval && retval != EXT2_ET_EXTENT_NOT_FOUND)
1264                 goto done;
1265
1266         /* check if already pointing to the requested physical */
1267         if (mapped && (new_uninit == extent_uninit) &&
1268             (extent.e_pblk + (logical - extent.e_lblk) == physical)) {
1269 #ifdef DEBUG
1270                 printf("physical block (at %llu) unchanged\n", logical);
1271 #endif
1272                 goto done;
1273         }
1274
1275         if (!mapped) {
1276 #ifdef DEBUG
1277                 printf("mapping unmapped logical block %llu\n", logical);
1278 #endif
1279                 if ((logical == extent.e_lblk + extent.e_len) &&
1280                     (physical == extent.e_pblk + extent.e_len) &&
1281                     (new_uninit == extent_uninit) &&
1282                     ((int) extent.e_len < max_len-1)) {
1283                         extent.e_len++;
1284                         retval = ext2fs_extent_replace(handle, 0, &extent);
1285                 } else if ((logical == extent.e_lblk - 1) &&
1286                            (physical == extent.e_pblk - 1) &&
1287                            (new_uninit == extent_uninit) &&
1288                            ((int) extent.e_len < max_len - 1)) {
1289                         extent.e_len++;
1290                         extent.e_lblk--;
1291                         extent.e_pblk--;
1292                         retval = ext2fs_extent_replace(handle, 0, &extent);
1293                 } else if (has_next &&
1294                            (logical == next_extent.e_lblk - 1) &&
1295                            (physical == next_extent.e_pblk - 1) &&
1296                            (new_uninit == next_uninit) &&
1297                            ((int) next_extent.e_len < max_len - 1)) {
1298                         retval = ext2fs_extent_get(handle,
1299                                                    EXT2_EXTENT_NEXT_LEAF,
1300                                                    &next_extent);
1301                         if (retval)
1302                                 goto done;
1303                         next_extent.e_len++;
1304                         next_extent.e_lblk--;
1305                         next_extent.e_pblk--;
1306                         retval = ext2fs_extent_replace(handle, 0, &next_extent);
1307                 } else if (logical < extent.e_lblk)
1308                         retval = ext2fs_extent_insert(handle, 0, &newextent);
1309                 else
1310                         retval = ext2fs_extent_insert(handle,
1311                                       EXT2_EXTENT_INSERT_AFTER, &newextent);
1312                 if (retval)
1313                         goto done;
1314                 retval = ext2fs_extent_fix_parents(handle);
1315                 if (retval)
1316                         goto done;
1317         } else if ((logical == extent.e_lblk) && (extent.e_len == 1))  {
1318 #ifdef DEBUG
1319                 printf("(re/un)mapping only block in extent\n");
1320 #endif
1321                 if (physical) {
1322                         retval = ext2fs_extent_replace(handle, 0, &newextent);
1323                 } else {
1324                         retval = ext2fs_extent_delete(handle, 0);
1325                         if (retval)
1326                                 goto done;
1327                         ec = ext2fs_extent_fix_parents(handle);
1328                         if (ec != EXT2_ET_NO_CURRENT_NODE)
1329                                 retval = ec;
1330                 }
1331
1332                 if (retval)
1333                         goto done;
1334         } else if (logical == extent.e_lblk + extent.e_len - 1)  {
1335 #ifdef DEBUG
1336                 printf("(re/un)mapping last block in extent\n");
1337 #endif
1338                 if (physical) {
1339                         if (has_next &&
1340                             (logical == (next_extent.e_lblk - 1)) &&
1341                             (physical == (next_extent.e_pblk - 1)) &&
1342                             (new_uninit == next_uninit) &&
1343                             ((int) next_extent.e_len < max_len - 1)) {
1344                                 retval = ext2fs_extent_get(handle,
1345                                         EXT2_EXTENT_NEXT_LEAF, &next_extent);
1346                                 if (retval)
1347                                         goto done;
1348                                 next_extent.e_len++;
1349                                 next_extent.e_lblk--;
1350                                 next_extent.e_pblk--;
1351                                 retval = ext2fs_extent_replace(handle, 0,
1352                                                                &next_extent);
1353                                 if (retval)
1354                                         goto done;
1355                         } else
1356                                 retval = ext2fs_extent_insert(handle,
1357                                       EXT2_EXTENT_INSERT_AFTER, &newextent);
1358                         if (retval)
1359                                 goto done;
1360                         /* Now pointing at inserted extent; move back to prev */
1361                         retval = ext2fs_extent_get(handle,
1362                                                    EXT2_EXTENT_PREV_LEAF,
1363                                                    &extent);
1364                         if (retval)
1365                                 goto done;
1366                 }
1367                 extent.e_len--;
1368                 retval = ext2fs_extent_replace(handle, 0, &extent);
1369                 if (retval)
1370                         goto done;
1371         } else if (logical == extent.e_lblk) {
1372 #ifdef DEBUG
1373                 printf("(re/un)mapping first block in extent\n");
1374 #endif
1375                 if (physical) {
1376                         if (has_prev &&
1377                             (logical == (prev_extent.e_lblk +
1378                                          prev_extent.e_len)) &&
1379                             (physical == (prev_extent.e_pblk +
1380                                           prev_extent.e_len)) &&
1381                             (new_uninit == prev_uninit) &&
1382                             ((int) prev_extent.e_len < max_len-1)) {
1383                                 retval = ext2fs_extent_get(handle,
1384                                         EXT2_EXTENT_PREV_LEAF, &prev_extent);
1385                                 if (retval)
1386                                         goto done;
1387                                 prev_extent.e_len++;
1388                                 retval = ext2fs_extent_replace(handle, 0,
1389                                                                &prev_extent);
1390                         } else
1391                                 retval = ext2fs_extent_insert(handle,
1392                                                               0, &newextent);
1393                         if (retval)
1394                                 goto done;
1395                         retval = ext2fs_extent_get(handle,
1396                                                    EXT2_EXTENT_NEXT_LEAF,
1397                                                    &extent);
1398                         if (retval)
1399                                 goto done;
1400                 }
1401                 extent.e_pblk++;
1402                 extent.e_lblk++;
1403                 extent.e_len--;
1404                 retval = ext2fs_extent_replace(handle, 0, &extent);
1405                 if (retval)
1406                         goto done;
1407         } else {
1408                 __u32   orig_length;
1409
1410 #ifdef DEBUG
1411                 printf("(re/un)mapping in middle of extent\n");
1412 #endif
1413                 /* need to split this extent; later */
1414
1415                 orig_length = extent.e_len;
1416
1417                 /* shorten pre-split extent */
1418                 extent.e_len = (logical - extent.e_lblk);
1419                 retval = ext2fs_extent_replace(handle, 0, &extent);
1420                 if (retval)
1421                         goto done;
1422                 /* insert our new extent, if any */
1423                 if (physical) {
1424                         /* insert new extent after current */
1425                         retval = ext2fs_extent_insert(handle,
1426                                         EXT2_EXTENT_INSERT_AFTER, &newextent);
1427                         if (retval)
1428                                 goto done;
1429                 }
1430                 /* add post-split extent */
1431                 extent.e_pblk += extent.e_len + 1;
1432                 extent.e_lblk += extent.e_len + 1;
1433                 extent.e_len = orig_length - extent.e_len - 1;
1434                 retval = ext2fs_extent_insert(handle,
1435                                 EXT2_EXTENT_INSERT_AFTER, &extent);
1436                 if (retval)
1437                         goto done;
1438         }
1439
1440 done:
1441         /* get handle back to its position */
1442         if (orig_height > handle->max_depth)
1443                 orig_height = handle->max_depth; /* In case we shortened the tree */
1444         extent_goto(handle, orig_height, orig_lblk);
1445         return retval;
1446 }
1447
1448 errcode_t ext2fs_extent_delete(ext2_extent_handle_t handle, int flags)
1449 {
1450         struct extent_path              *path;
1451         char                            *cp;
1452         struct ext3_extent_header       *eh;
1453         errcode_t                       retval = 0;
1454
1455         EXT2_CHECK_MAGIC(handle, EXT2_ET_MAGIC_EXTENT_HANDLE);
1456
1457         if (!(handle->fs->flags & EXT2_FLAG_RW))
1458                 return EXT2_ET_RO_FILSYS;
1459
1460         if (!handle->path)
1461                 return EXT2_ET_NO_CURRENT_NODE;
1462
1463 #ifdef DEBUG
1464         {
1465                 struct ext2fs_extent    extent;
1466
1467                 retval = ext2fs_extent_get(handle, EXT2_EXTENT_CURRENT,
1468                                            &extent);
1469                 if (retval == 0) {
1470                         printf("extent delete %u ", handle->ino);
1471                         dbg_print_extent(0, &extent);
1472                 }
1473         }
1474 #endif
1475
1476         path = handle->path + handle->level;
1477         if (!path->curr)
1478                 return EXT2_ET_NO_CURRENT_NODE;
1479
1480         cp = path->curr;
1481
1482         if (path->left) {
1483                 memmove(cp, cp + sizeof(struct ext3_extent_idx),
1484                         path->left * sizeof(struct ext3_extent_idx));
1485                 path->left--;
1486         } else {
1487                 struct ext3_extent_idx  *ix = path->curr;
1488                 ix--;
1489                 path->curr = ix;
1490         }
1491         if (--path->entries == 0)
1492                 path->curr = 0;
1493
1494         /* if non-root node has no entries left, remove it & parent ptr to it */
1495         if (path->entries == 0 && handle->level) {
1496                 if (!(flags & EXT2_EXTENT_DELETE_KEEP_EMPTY)) {
1497                         struct ext2fs_extent    extent;
1498
1499                         retval = ext2fs_extent_get(handle, EXT2_EXTENT_UP,
1500                                                                 &extent);
1501                         if (retval)
1502                                 return retval;
1503
1504                         retval = ext2fs_extent_delete(handle, flags);
1505                         handle->inode->i_blocks -=
1506                                 (handle->fs->blocksize *
1507                                  EXT2FS_CLUSTER_RATIO(handle->fs)) / 512;
1508                         retval = ext2fs_write_inode(handle->fs, handle->ino,
1509                                                     handle->inode);
1510                         ext2fs_block_alloc_stats2(handle->fs,
1511                                                   extent.e_pblk, -1);
1512                 }
1513         } else {
1514                 eh = (struct ext3_extent_header *) path->buf;
1515                 eh->eh_entries = ext2fs_cpu_to_le16(path->entries);
1516                 if ((path->entries == 0) && (handle->level == 0))
1517                         eh->eh_depth = handle->max_depth = 0;
1518                 retval = update_path(handle);
1519         }
1520         return retval;
1521 }
1522
1523 errcode_t ext2fs_extent_get_info(ext2_extent_handle_t handle,
1524                                  struct ext2_extent_info *info)
1525 {
1526         struct extent_path              *path;
1527
1528         EXT2_CHECK_MAGIC(handle, EXT2_ET_MAGIC_EXTENT_HANDLE);
1529
1530         memset(info, 0, sizeof(struct ext2_extent_info));
1531
1532         path = handle->path + handle->level;
1533         if (path) {
1534                 if (path->curr)
1535                         info->curr_entry = ((char *) path->curr - path->buf) /
1536                                 sizeof(struct ext3_extent_idx);
1537                 else
1538                         info->curr_entry = 0;
1539                 info->num_entries = path->entries;
1540                 info->max_entries = path->max_entries;
1541                 info->bytes_avail = (path->max_entries - path->entries) *
1542                         sizeof(struct ext3_extent);
1543         }
1544
1545         info->curr_level = handle->level;
1546         info->max_depth = handle->max_depth;
1547         info->max_lblk = ((__u64) 1 << 32) - 1;
1548         info->max_pblk = ((__u64) 1 << 48) - 1;
1549         info->max_len = (1UL << 15);
1550         info->max_uninit_len = (1UL << 15) - 1;
1551
1552         return 0;
1553 }
1554
1555 #ifdef DEBUG
1556
1557 #include "ss/ss.h"
1558
1559 #include "debugfs.h"
1560
1561 /*
1562  * Hook in new commands into debugfs
1563  */
1564 const char *debug_prog_name = "tst_extents";
1565 extern ss_request_table extent_cmds;
1566 ss_request_table *extra_cmds = &extent_cmds;
1567
1568 ext2_ino_t      current_ino = 0;
1569 ext2_extent_handle_t current_handle;
1570
1571 int common_extent_args_process(int argc, char *argv[], int min_argc,
1572                                int max_argc, const char *cmd,
1573                                const char *usage, int flags)
1574 {
1575         if (common_args_process(argc, argv, min_argc, max_argc, cmd,
1576                                 usage, flags))
1577                 return 1;
1578
1579         if (!current_handle) {
1580                 com_err(cmd, 0, "Extent handle not open");
1581                 return 1;
1582         }
1583         return 0;
1584 }
1585
1586 void do_inode(int argc, char *argv[])
1587 {
1588         ext2_ino_t      inode;
1589         int             i;
1590         struct ext3_extent_header *eh;
1591         errcode_t retval;
1592
1593         if (check_fs_open(argv[0]))
1594                 return;
1595
1596         if (argc == 1) {
1597                 if (current_ino)
1598                         printf("Current inode is %d\n", current_ino);
1599                 else
1600                         printf("No current inode\n");
1601                 return;
1602         }
1603
1604         if (common_inode_args_process(argc, argv, &inode, 0)) {
1605                 return;
1606         }
1607
1608         current_ino = 0;
1609
1610         retval = ext2fs_extent_open(current_fs, inode, &current_handle);
1611         if (retval) {
1612                 com_err(argv[1], retval, "while opening extent handle");
1613                 return;
1614         }
1615
1616         current_ino = inode;
1617
1618         printf("Loaded inode %d\n", current_ino);
1619
1620         return;
1621 }
1622
1623 void generic_goto_node(char *cmd_name, int op)
1624 {
1625         struct ext2fs_extent    extent;
1626         errcode_t               retval;
1627
1628         if (check_fs_open(cmd_name))
1629                 return;
1630
1631         if (!current_handle) {
1632                 com_err(cmd_name, 0, "Extent handle not open");
1633                 return;
1634         }
1635
1636         retval = ext2fs_extent_get(current_handle, op, &extent);
1637         if (retval) {
1638                 com_err(cmd_name, retval, 0);
1639                 return;
1640         }
1641         dbg_print_extent(0, &extent);
1642 }
1643
1644 void do_current_node(int argc, char *argv[])
1645 {
1646         generic_goto_node(argv[0], EXT2_EXTENT_CURRENT);
1647 }
1648
1649 void do_root_node(int argc, char *argv[])
1650 {
1651         generic_goto_node(argv[0], EXT2_EXTENT_ROOT);
1652 }
1653
1654 void do_last_leaf(int argc, char *argv[])
1655 {
1656         generic_goto_node(argv[0], EXT2_EXTENT_LAST_LEAF);
1657 }
1658
1659 void do_first_sib(int argc, char *argv[])
1660 {
1661         generic_goto_node(argv[0], EXT2_EXTENT_FIRST_SIB);
1662 }
1663
1664 void do_last_sib(int argc, char *argv[])
1665 {
1666         generic_goto_node(argv[0], EXT2_EXTENT_LAST_SIB);
1667 }
1668
1669 void do_next_sib(int argc, char *argv[])
1670 {
1671         generic_goto_node(argv[0], EXT2_EXTENT_NEXT_SIB);
1672 }
1673
1674 void do_prev_sib(int argc, char *argv[])
1675 {
1676         generic_goto_node(argv[0], EXT2_EXTENT_PREV_SIB);
1677 }
1678
1679 void do_next_leaf(int argc, char *argv[])
1680 {
1681         generic_goto_node(argv[0], EXT2_EXTENT_NEXT_LEAF);
1682 }
1683
1684 void do_prev_leaf(int argc, char *argv[])
1685 {
1686         generic_goto_node(argv[0], EXT2_EXTENT_PREV_LEAF);
1687 }
1688
1689 void do_next(int argc, char *argv[])
1690 {
1691         generic_goto_node(argv[0], EXT2_EXTENT_NEXT);
1692 }
1693
1694 void do_prev(int argc, char *argv[])
1695 {
1696         generic_goto_node(argv[0], EXT2_EXTENT_PREV);
1697 }
1698
1699 void do_up(int argc, char *argv[])
1700 {
1701         generic_goto_node(argv[0], EXT2_EXTENT_UP);
1702 }
1703
1704 void do_down(int argc, char *argv[])
1705 {
1706         generic_goto_node(argv[0], EXT2_EXTENT_DOWN);
1707 }
1708
1709 void do_delete_node(int argc, char *argv[])
1710 {
1711         errcode_t       retval;
1712         int             err;
1713
1714         if (common_extent_args_process(argc, argv, 1, 1, "delete_node",
1715                                        "", CHECK_FS_RW | CHECK_FS_BITMAPS))
1716                 return;
1717
1718         retval = ext2fs_extent_delete(current_handle, 0);
1719         if (retval) {
1720                 com_err(argv[0], retval, 0);
1721                 return;
1722         }
1723         if (current_handle->path && current_handle->path[0].curr)
1724                 do_current_node(argc, argv);
1725 }
1726
1727 void do_replace_node(int argc, char *argv[])
1728 {
1729         const char      *usage = "[--uninit] <lblk> <len> <pblk>";
1730         errcode_t       retval;
1731         struct ext2fs_extent extent;
1732         int err;
1733
1734         if (common_extent_args_process(argc, argv, 3, 5, "replace_node",
1735                                        usage, CHECK_FS_RW | CHECK_FS_BITMAPS))
1736                 return;
1737
1738         extent.e_flags = 0;
1739
1740         if (!strcmp(argv[1], "--uninit")) {
1741                 argc--;
1742                 argv++;
1743                 extent.e_flags |= EXT2_EXTENT_FLAGS_UNINIT;
1744         }
1745
1746         if (argc != 4) {
1747                 fprintf(stderr, "Usage: %s %s\n", argv[0], usage);
1748                 return;
1749         }
1750
1751         extent.e_lblk = parse_ulong(argv[1], argv[0], "logical block", &err);
1752         if (err)
1753                 return;
1754
1755         extent.e_len = parse_ulong(argv[2], argv[0], "logical block", &err);
1756         if (err)
1757                 return;
1758
1759         extent.e_pblk = parse_ulong(argv[3], argv[0], "logical block", &err);
1760         if (err)
1761                 return;
1762
1763         retval = ext2fs_extent_replace(current_handle, 0, &extent);
1764         if (retval) {
1765                 com_err(argv[0], retval, 0);
1766                 return;
1767         }
1768         do_current_node(argc, argv);
1769 }
1770
1771 void do_split_node(int argc, char *argv[])
1772 {
1773         errcode_t       retval;
1774         struct ext2fs_extent extent;
1775         int err;
1776
1777         if (common_extent_args_process(argc, argv, 1, 1, "split_node",
1778                                        "", CHECK_FS_RW | CHECK_FS_BITMAPS))
1779                 return;
1780
1781         retval = extent_node_split(current_handle);
1782         if (retval) {
1783                 com_err(argv[0], retval, 0);
1784                 return;
1785         }
1786         do_current_node(argc, argv);
1787 }
1788
1789 void do_insert_node(int argc, char *argv[])
1790 {
1791         const char      *usage = "[--after] [--uninit] <lblk> <len> <pblk>";
1792         errcode_t       retval;
1793         struct ext2fs_extent extent;
1794         char *cmd;
1795         int err;
1796         int flags = 0;
1797
1798         if (common_extent_args_process(argc, argv, 3, 6, "insert_node",
1799                                        usage, CHECK_FS_RW | CHECK_FS_BITMAPS))
1800                 return;
1801
1802         cmd = argv[0];
1803
1804         extent.e_flags = 0;
1805
1806         while (argc > 2) {
1807                 if (!strcmp(argv[1], "--after")) {
1808                         argc--;
1809                         argv++;
1810                         flags |= EXT2_EXTENT_INSERT_AFTER;
1811                         continue;
1812                 }
1813                 if (!strcmp(argv[1], "--uninit")) {
1814                         argc--;
1815                         argv++;
1816                         extent.e_flags |= EXT2_EXTENT_FLAGS_UNINIT;
1817                         continue;
1818                 }
1819                 break;
1820         }
1821
1822         if (argc != 4) {
1823                 fprintf(stderr, "usage: %s %s\n", cmd, usage);
1824                 return;
1825         }
1826
1827         extent.e_lblk = parse_ulong(argv[1], cmd,
1828                                     "logical block", &err);
1829         if (err)
1830                 return;
1831
1832         extent.e_len = parse_ulong(argv[2], cmd,
1833                                     "length", &err);
1834         if (err)
1835                 return;
1836
1837         extent.e_pblk = parse_ulong(argv[3], cmd,
1838                                     "pysical block", &err);
1839         if (err)
1840                 return;
1841
1842         retval = ext2fs_extent_insert(current_handle, flags, &extent);
1843         if (retval) {
1844                 com_err(cmd, retval, 0);
1845                 return;
1846         }
1847         do_current_node(argc, argv);
1848 }
1849
1850 void do_set_bmap(int argc, char **argv)
1851 {
1852         const char      *usage = "[--uninit] <lblk> <pblk>";
1853         errcode_t       retval;
1854         blk_t           logical;
1855         blk_t           physical;
1856         char            *cmd = argv[0];
1857         int             flags = 0;
1858         int             err;
1859
1860         if (common_extent_args_process(argc, argv, 3, 5, "set_bmap",
1861                                        usage, CHECK_FS_RW | CHECK_FS_BITMAPS))
1862                 return;
1863
1864         if (argc > 2 && !strcmp(argv[1], "--uninit")) {
1865                 argc--;
1866                 argv++;
1867                 flags |= EXT2_EXTENT_SET_BMAP_UNINIT;
1868         }
1869
1870         if (argc != 3) {
1871                 fprintf(stderr, "Usage: %s %s\n", cmd, usage);
1872                 return;
1873         }
1874
1875         logical = parse_ulong(argv[1], cmd,
1876                                     "logical block", &err);
1877         if (err)
1878                 return;
1879
1880         physical = parse_ulong(argv[2], cmd,
1881                                     "physical block", &err);
1882         if (err)
1883                 return;
1884
1885         retval = ext2fs_extent_set_bmap(current_handle, logical,
1886                                         (blk64_t) physical, flags);
1887         if (retval) {
1888                 com_err(cmd, retval, 0);
1889                 return;
1890         }
1891         if (current_handle->path && current_handle->path[0].curr)
1892                 do_current_node(argc, argv);
1893 }
1894
1895 void do_print_all(int argc, char **argv)
1896 {
1897         const char      *usage = "[--leaf-only|--reverse|--reverse-leaf]";
1898         struct ext2fs_extent    extent;
1899         errcode_t               retval;
1900         errcode_t               end_err = EXT2_ET_EXTENT_NO_NEXT;
1901         int                     op = EXT2_EXTENT_NEXT;
1902         int                     first_op = EXT2_EXTENT_ROOT;
1903
1904
1905         if (common_extent_args_process(argc, argv, 1, 2, "print_all",
1906                                        usage, 0))
1907                 return;
1908
1909         if (argc == 2) {
1910                 if (!strcmp(argv[1], "--leaf-only"))
1911                         op = EXT2_EXTENT_NEXT_LEAF;
1912                 else if (!strcmp(argv[1], "--reverse")) {
1913                         op = EXT2_EXTENT_PREV;
1914                         first_op = EXT2_EXTENT_LAST_LEAF;
1915                         end_err = EXT2_ET_EXTENT_NO_PREV;
1916                 } else if (!strcmp(argv[1], "--reverse-leaf")) {
1917                         op = EXT2_EXTENT_PREV_LEAF;
1918                         first_op = EXT2_EXTENT_LAST_LEAF;
1919                         end_err = EXT2_ET_EXTENT_NO_PREV;
1920                 } else {
1921                         fprintf(stderr, "Usage: %s %s\n", argv[0], usage);
1922                         return;
1923                 }
1924         }
1925
1926         retval = ext2fs_extent_get(current_handle, first_op, &extent);
1927         if (retval) {
1928                 com_err(argv[0], retval, 0);
1929                 return;
1930         }
1931         dbg_print_extent(0, &extent);
1932
1933         while (1) {
1934                 retval = ext2fs_extent_get(current_handle, op, &extent);
1935                 if (retval == end_err)
1936                         break;
1937
1938                 if (retval) {
1939                         com_err(argv[0], retval, 0);
1940                         return;
1941                 }
1942                 dbg_print_extent(0, &extent);
1943         }
1944 }
1945
1946 void do_info(int argc, char **argv)
1947 {
1948         struct ext2fs_extent    extent;
1949         struct ext2_extent_info info;
1950         errcode_t               retval;
1951
1952         if (common_extent_args_process(argc, argv, 1, 1, "info", "", 0))
1953                 return;
1954
1955         retval = ext2fs_extent_get_info(current_handle, &info);
1956         if (retval) {
1957                 com_err(argv[0], retval, 0);
1958                 return;
1959         }
1960
1961         retval = ext2fs_extent_get(current_handle,
1962                                    EXT2_EXTENT_CURRENT, &extent);
1963         if (retval) {
1964                 com_err(argv[0], retval, 0);
1965                 return;
1966         }
1967
1968         dbg_print_extent(0, &extent);
1969
1970         printf("Current handle location: %d/%d (max: %d, bytes %d), level %d/%d\n",
1971                info.curr_entry, info.num_entries, info.max_entries,
1972                info.bytes_avail, info.curr_level, info.max_depth);
1973         printf("\tmax lblk: %llu, max pblk: %llu\n", info.max_lblk,
1974                info.max_pblk);
1975         printf("\tmax_len: %u, max_uninit_len: %u\n", info.max_len,
1976                info.max_uninit_len);
1977 }
1978
1979 void do_goto_block(int argc, char **argv)
1980 {
1981         struct ext2fs_extent    extent;
1982         errcode_t               retval;
1983         int                     op = EXT2_EXTENT_NEXT_LEAF;
1984         blk64_t                 blk;
1985         int                     level = 0, err;
1986
1987         if (common_extent_args_process(argc, argv, 2, 3, "goto_block",
1988                                        "block [level]", 0))
1989                 return;
1990
1991         if (strtoblk(argv[0], argv[1], &blk))
1992                 return;
1993
1994         if (argc == 3) {
1995                 level = parse_ulong(argv[2], argv[0], "level", &err);
1996                 if (err)
1997                         return;
1998         }
1999
2000         retval = extent_goto(current_handle, level, (blk64_t) blk);
2001
2002         if (retval) {
2003                 com_err(argv[0], retval,
2004                         "while trying to go to block %llu, level %d",
2005                         (unsigned long long) blk, level);
2006                 return;
2007         }
2008
2009         generic_goto_node(argv[0], EXT2_EXTENT_CURRENT);
2010 }
2011 #endif
2012