/src/e2fsprogs/lib/ext2fs/gen_bitmap64.c

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/*
 * gen_bitmap64.c --- routines to read, write, and manipulate the new qinode and
 * block bitmaps.
 *
 * Copyright (C) 2007, 2008 Theodore Ts'o.
 *
 * %Begin-Header%
 * This file may be redistributed under the terms of the GNU Public
 * License.
 * %End-Header%
 */

#include "config.h"
#include <stdio.h>
#include <string.h>
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <fcntl.h>
#include <time.h>
#include <errno.h>
#if HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#if HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif

#include "ext2_fs.h"
#include "ext2fsP.h"
#include "bmap64.h"

/*
 * Design of 64-bit bitmaps
 *
 * In order maintain ABI compatibility with programs that don't
 * understand about 64-bit blocks/inodes,
 * ext2fs_allocate_inode_bitmap() and ext2fs_allocate_block_bitmap()
 * will create old-style bitmaps unless the application passes the
 * flag EXT2_FLAG_64BITS to ext2fs_open().  If this flag is
 * passed, then we know the application has been recompiled, so we can
 * use the new-style bitmaps.  If it is not passed, we have to return
 * an error if trying to open a filesystem which needs 64-bit bitmaps.
 *
 * The new bitmaps use a new set of structure magic numbers, so that
 * both the old-style and new-style interfaces can identify which
 * version of the data structure was used.  Both the old-style and
 * new-style interfaces will support either type of bitmap, although
 * of course 64-bit operation will only be possible when both the
 * new-style interface and the new-style bitmap are used.
 *
 * For example, the new bitmap interfaces will check the structure
 * magic numbers and so will be able to detect old-stype bitmap.  If
 * they see an old-style bitmap, they will pass it to the gen_bitmap.c
 * functions for handling.  The same will be true for the old
 * interfaces as well.
 *
 * The new-style interfaces will have several different back-end
 * implementations, so we can support different encodings that are
 * appropriate for different applications.  In general the default
 * should be whatever makes sense, and what the application/library
 * will use.  However, e2fsck may need specialized implementations for
 * its own uses.  For example, when doing parent directory pointer
 * loop detections in pass 3, the bitmap will *always* be sparse, so
 * e2fsck can request an encoding which is optimized for that.
 */

static void warn_bitmap(ext2fs_generic_bitmap_64 bitmap,
      int code, __u64 arg)
{
#ifndef OMIT_COM_ERR
  if (bitmap->description)
    com_err(0, bitmap->base_error_code+code,
      "#%llu for %s", (unsigned long long) arg,
      bitmap->description);
  else
    com_err(0, bitmap->base_error_code + code, "#%llu",
      (unsigned long long) arg);
#endif
}

#ifdef ENABLE_BMAP_STATS_OPS
#define INC_STAT(map, name) map->stats.name
#else
#define INC_STAT(map, name) ;;
#endif


errcode_t ext2fs_alloc_generic_bmap(ext2_filsys fs, errcode_t magic,
            int type, __u64 start, __u64 end,
            __u64 real_end,
            const char *descr,
            ext2fs_generic_bitmap *ret)
{
  ext2fs_generic_bitmap_64 bitmap;
  struct ext2_bitmap_ops  *ops;
  ext2_ino_t num_dirs;
  errcode_t retval;

  if (!type)
    type = EXT2FS_BMAP64_BITARRAY;

  switch (type) {
  case EXT2FS_BMAP64_BITARRAY:
    ops = &ext2fs_blkmap64_bitarray;
    break;
  case EXT2FS_BMAP64_RBTREE:
    ops = &ext2fs_blkmap64_rbtree;
    break;
  case EXT2FS_BMAP64_AUTODIR:
    retval = ext2fs_get_num_dirs(fs, &num_dirs);
    if (retval || num_dirs > (fs->super->s_inodes_count / 320))
      ops = &ext2fs_blkmap64_bitarray;
    else
      ops = &ext2fs_blkmap64_rbtree;
    break;
  default:
    return EINVAL;
  }

  retval = ext2fs_get_memzero(sizeof(struct ext2fs_struct_generic_bitmap_64),
            &bitmap);
  if (retval)
    return retval;

#ifdef ENABLE_BMAP_STATS
  if (gettimeofday(&bitmap->stats.created,
       (struct timezone *) NULL) == -1) {
    perror("gettimeofday");
    ext2fs_free_mem(&bitmap);
    return 1;
  }
  bitmap->stats.type = type;
#endif

  /* XXX factor out, repeated in copy_bmap */
  bitmap->magic = magic;
  bitmap->fs = fs;
  bitmap->start = start;
  bitmap->end = end;
  bitmap->real_end = real_end;
  bitmap->bitmap_ops = ops;
  bitmap->cluster_bits = 0;
  switch (magic) {
  case EXT2_ET_MAGIC_INODE_BITMAP64:
    bitmap->base_error_code = EXT2_ET_BAD_INODE_MARK;
    break;
  case EXT2_ET_MAGIC_BLOCK_BITMAP64:
    bitmap->base_error_code = EXT2_ET_BAD_BLOCK_MARK;
    bitmap->cluster_bits = fs->cluster_ratio_bits;
    break;
  default:
    bitmap->base_error_code = EXT2_ET_BAD_GENERIC_MARK;
  }
  if (descr) {
    retval = ext2fs_get_mem(strlen(descr)+1, &bitmap->description);
    if (retval) {
      ext2fs_free_mem(&bitmap);
      return retval;
    }
    strcpy(bitmap->description, descr);
  } else
    bitmap->description = 0;

  retval = bitmap->bitmap_ops->new_bmap(fs, bitmap);
  if (retval) {
    ext2fs_free_mem(&bitmap->description);
    ext2fs_free_mem(&bitmap);
    return retval;
  }

  *ret = (ext2fs_generic_bitmap) bitmap;
  return 0;
}

#ifdef ENABLE_BMAP_STATS
static void ext2fs_print_bmap_statistics(ext2fs_generic_bitmap_64 bitmap)
{
  struct ext2_bmap_statistics *stats = &bitmap->stats;
#ifdef ENABLE_BMAP_STATS_OPS
  float mark_seq_perc = 0.0, test_seq_perc = 0.0;
  float mark_back_perc = 0.0, test_back_perc = 0.0;
#endif
  double inuse;
  struct timeval now;

#ifdef ENABLE_BMAP_STATS_OPS
  if (stats->test_count) {
    test_seq_perc = ((float)stats->test_seq /
         stats->test_count) * 100;
    test_back_perc = ((float)stats->test_back /
          stats->test_count) * 100;
  }

  if (stats->mark_count) {
    mark_seq_perc = ((float)stats->mark_seq /
         stats->mark_count) * 100;
    mark_back_perc = ((float)stats->mark_back /
          stats->mark_count) * 100;
  }
#endif

  if (gettimeofday(&now, (struct timezone *) NULL) == -1) {
    perror("gettimeofday");
    return;
  }

  inuse = (double) now.tv_sec + \
    (((double) now.tv_usec) * 0.000001);
  inuse -= (double) stats->created.tv_sec + \
    (((double) stats->created.tv_usec) * 0.000001);

  fprintf(stderr, "\n[+] %s bitmap (type %d)\n", bitmap->description,
    stats->type);
  fprintf(stderr, "=================================================\n");
#ifdef ENABLE_BMAP_STATS_OPS
  fprintf(stderr, "%16llu bits long\n",
    bitmap->real_end - bitmap->start);
  fprintf(stderr, "%16lu copy_bmap\n%16lu resize_bmap\n",
    stats->copy_count, stats->resize_count);
  fprintf(stderr, "%16lu mark bmap\n%16lu unmark_bmap\n",
    stats->mark_count, stats->unmark_count);
  fprintf(stderr, "%16lu test_bmap\n%16lu mark_bmap_extent\n",
    stats->test_count, stats->mark_ext_count);
  fprintf(stderr, "%16lu unmark_bmap_extent\n"
    "%16lu test_clear_bmap_extent\n",
    stats->unmark_ext_count, stats->test_ext_count);
  fprintf(stderr, "%16lu set_bmap_range\n%16lu set_bmap_range\n",
    stats->set_range_count, stats->get_range_count);
  fprintf(stderr, "%16lu clear_bmap\n%16lu contiguous bit test (%.2f%%)\n",
    stats->clear_count, stats->test_seq, test_seq_perc);
  fprintf(stderr, "%16lu contiguous bit mark (%.2f%%)\n"
    "%16llu bits tested backwards (%.2f%%)\n",
    stats->mark_seq, mark_seq_perc,
    stats->test_back, test_back_perc);
  fprintf(stderr, "%16llu bits marked backwards (%.2f%%)\n"
    "%16.2f seconds in use\n",
    stats->mark_back, mark_back_perc, inuse);
#endif /* ENABLE_BMAP_STATS_OPS */
}
#endif

void ext2fs_free_generic_bmap(ext2fs_generic_bitmap gen_bmap)
{
  ext2fs_generic_bitmap_64 bmap = (ext2fs_generic_bitmap_64) gen_bmap;

  if (!bmap)
    return;

  if (EXT2FS_IS_32_BITMAP(bmap)) {
    ext2fs_free_generic_bitmap(gen_bmap);
    return;
  }

  if (!EXT2FS_IS_64_BITMAP(bmap))
    return;

#ifdef ENABLE_BMAP_STATS
  if (getenv("E2FSPROGS_BITMAP_STATS")) {
    ext2fs_print_bmap_statistics(bmap);
    bmap->bitmap_ops->print_stats(bmap);
  }
#endif

  bmap->bitmap_ops->free_bmap(bmap);

  if (bmap->description) {
    ext2fs_free_mem(&bmap->description);
    bmap->description = 0;
  }
  bmap->magic = 0;
  ext2fs_free_mem(&bmap);
}

errcode_t ext2fs_copy_generic_bmap(ext2fs_generic_bitmap gen_src,
           ext2fs_generic_bitmap *dest)
{
  ext2fs_generic_bitmap_64 src = (ext2fs_generic_bitmap_64) gen_src;
  char *descr, *new_descr;
  ext2fs_generic_bitmap_64 new_bmap;
  errcode_t retval;

  if (!src)
    return EINVAL;

  if (EXT2FS_IS_32_BITMAP(src))
    return ext2fs_copy_generic_bitmap(gen_src, dest);

  if (!EXT2FS_IS_64_BITMAP(src))
    return EINVAL;

  /* Allocate a new bitmap struct */
  retval = ext2fs_get_memzero(sizeof(struct ext2fs_struct_generic_bitmap_64),
            &new_bmap);
  if (retval)
    return retval;


#ifdef ENABLE_BMAP_STATS_OPS
  src->stats.copy_count++;
#endif
#ifdef ENABLE_BMAP_STATS
  if (gettimeofday(&new_bmap->stats.created,
       (struct timezone *) NULL) == -1) {
    perror("gettimeofday");
    ext2fs_free_mem(&new_bmap);
    return 1;
  }
  new_bmap->stats.type = src->stats.type;
#endif

  /* Copy all the high-level parts over */
  new_bmap->magic = src->magic;
  new_bmap->fs = src->fs;
  new_bmap->start = src->start;
  new_bmap->end = src->end;
  new_bmap->real_end = src->real_end;
  new_bmap->bitmap_ops = src->bitmap_ops;
  new_bmap->base_error_code = src->base_error_code;
  new_bmap->cluster_bits = src->cluster_bits;

  descr = src->description;
  if (descr) {
    retval = ext2fs_get_mem(strlen(descr)+10, &new_descr);
    if (retval) {
      ext2fs_free_mem(&new_bmap);
      return retval;
    }
    strcpy(new_descr, "copy of ");
    strcat(new_descr, descr);
    new_bmap->description = new_descr;
  }

  retval = src->bitmap_ops->copy_bmap(src, new_bmap);
  if (retval) {
    ext2fs_free_mem(&new_bmap->description);
    ext2fs_free_mem(&new_bmap);
    return retval;
  }

  *dest = (ext2fs_generic_bitmap) new_bmap;

  return 0;
}

errcode_t ext2fs_resize_generic_bmap(ext2fs_generic_bitmap gen_bmap,
             __u64 new_end,
             __u64 new_real_end)
{
  ext2fs_generic_bitmap_64 bmap = (ext2fs_generic_bitmap_64) gen_bmap;

  if (!bmap)
    return EINVAL;

  if (EXT2FS_IS_32_BITMAP(bmap))
    return ext2fs_resize_generic_bitmap(gen_bmap->magic, new_end,
                new_real_end, gen_bmap);

  if (!EXT2FS_IS_64_BITMAP(bmap))
    return EINVAL;

  INC_STAT(bmap, resize_count);

  return bmap->bitmap_ops->resize_bmap(bmap, new_end, new_real_end);
}

errcode_t ext2fs_fudge_generic_bmap_end(ext2fs_generic_bitmap gen_bitmap,
          errcode_t neq,
          __u64 end, __u64 *oend)
{
  ext2fs_generic_bitmap_64 bitmap = (ext2fs_generic_bitmap_64) gen_bitmap;

  if (!bitmap)
    return EINVAL;

  if (EXT2FS_IS_32_BITMAP(bitmap)) {
    ext2_ino_t tmp_oend;
    int retval;

    retval = ext2fs_fudge_generic_bitmap_end(gen_bitmap,
               bitmap->magic,
               neq, end, &tmp_oend);
    if (oend)
      *oend = tmp_oend;
    return retval;
  }

  if (!EXT2FS_IS_64_BITMAP(bitmap))
    return EINVAL;

  if (end > bitmap->real_end)
    return neq;
  if (oend)
    *oend = bitmap->end;
  bitmap->end = end;
  return 0;
}

__u64 ext2fs_get_generic_bmap_start(ext2fs_generic_bitmap gen_bitmap)
{
  ext2fs_generic_bitmap_64 bitmap = (ext2fs_generic_bitmap_64) gen_bitmap;

  if (!bitmap)
    return EINVAL;

  if (EXT2FS_IS_32_BITMAP(bitmap))
    return ext2fs_get_generic_bitmap_start(gen_bitmap);

  if (!EXT2FS_IS_64_BITMAP(bitmap))
    return EINVAL;

  return bitmap->start;
}

__u64 ext2fs_get_generic_bmap_end(ext2fs_generic_bitmap gen_bitmap)
{
  ext2fs_generic_bitmap_64 bitmap = (ext2fs_generic_bitmap_64) gen_bitmap;

  if (!bitmap)
    return EINVAL;

  if (EXT2FS_IS_32_BITMAP(bitmap))
    return ext2fs_get_generic_bitmap_end(gen_bitmap);

  if (!EXT2FS_IS_64_BITMAP(bitmap))
    return EINVAL;

  return bitmap->end;
}

void ext2fs_clear_generic_bmap(ext2fs_generic_bitmap gen_bitmap)
{
  ext2fs_generic_bitmap_64 bitmap = (ext2fs_generic_bitmap_64) gen_bitmap;

  if (EXT2FS_IS_32_BITMAP(bitmap))
    ext2fs_clear_generic_bitmap(gen_bitmap);
  else
    bitmap->bitmap_ops->clear_bmap(bitmap);
}

int ext2fs_mark_generic_bmap(ext2fs_generic_bitmap gen_bitmap,
           __u64 arg)
{
  ext2fs_generic_bitmap_64 bitmap = (ext2fs_generic_bitmap_64) gen_bitmap;

  if (!bitmap)
    return 0;

  if (EXT2FS_IS_32_BITMAP(bitmap)) {
    if (arg & ~0xffffffffULL) {
      ext2fs_warn_bitmap2(gen_bitmap,
              EXT2FS_MARK_ERROR, 0xffffffff);
      return 0;
    }
    return ext2fs_mark_generic_bitmap(gen_bitmap, arg);
  }

  if (!EXT2FS_IS_64_BITMAP(bitmap))
    return 0;

  arg >>= bitmap->cluster_bits;

#ifdef ENABLE_BMAP_STATS_OPS
  if (arg == bitmap->stats.last_marked + 1)
    bitmap->stats.mark_seq++;
  if (arg < bitmap->stats.last_marked)
    bitmap->stats.mark_back++;
  bitmap->stats.last_marked = arg;
  bitmap->stats.mark_count++;
#endif

  if ((arg < bitmap->start) || (arg > bitmap->end)) {
    warn_bitmap(bitmap, EXT2FS_MARK_ERROR, arg);
    return 0;
  }

  return bitmap->bitmap_ops->mark_bmap(bitmap, arg);
}

int ext2fs_unmark_generic_bmap(ext2fs_generic_bitmap gen_bitmap,
             __u64 arg)
{
  ext2fs_generic_bitmap_64 bitmap = (ext2fs_generic_bitmap_64) gen_bitmap;

  if (!bitmap)
    return 0;

  if (EXT2FS_IS_32_BITMAP(bitmap)) {
    if (arg & ~0xffffffffULL) {
      ext2fs_warn_bitmap2(gen_bitmap, EXT2FS_UNMARK_ERROR,
              0xffffffff);
      return 0;
    }
    return ext2fs_unmark_generic_bitmap(gen_bitmap, arg);
  }

  if (!EXT2FS_IS_64_BITMAP(bitmap))
    return 0;

  arg >>= bitmap->cluster_bits;

  INC_STAT(bitmap, unmark_count);

  if ((arg < bitmap->start) || (arg > bitmap->end)) {
    warn_bitmap(bitmap, EXT2FS_UNMARK_ERROR, arg);
    return 0;
  }

  return bitmap->bitmap_ops->unmark_bmap(bitmap, arg);
}

int ext2fs_test_generic_bmap(ext2fs_generic_bitmap gen_bitmap,
           __u64 arg)
{
  ext2fs_generic_bitmap_64 bitmap = (ext2fs_generic_bitmap_64) gen_bitmap;
  if (!bitmap)
    return 0;

  if (EXT2FS_IS_32_BITMAP(bitmap)) {
    if (arg & ~0xffffffffULL) {
      ext2fs_warn_bitmap2(gen_bitmap, EXT2FS_TEST_ERROR,
              0xffffffff);
      return 0;
    }
    return ext2fs_test_generic_bitmap(gen_bitmap, arg);
  }

  if (!EXT2FS_IS_64_BITMAP(bitmap))
    return 0;

  arg >>= bitmap->cluster_bits;

#ifdef ENABLE_BMAP_STATS_OPS
  bitmap->stats.test_count++;
  if (arg == bitmap->stats.last_tested + 1)
    bitmap->stats.test_seq++;
  if (arg < bitmap->stats.last_tested)
    bitmap->stats.test_back++;
  bitmap->stats.last_tested = arg;
#endif

  if ((arg < bitmap->start) || (arg > bitmap->end)) {
    warn_bitmap(bitmap, EXT2FS_TEST_ERROR, arg);
    return 0;
  }

  return bitmap->bitmap_ops->test_bmap(bitmap, arg);
}

errcode_t ext2fs_set_generic_bmap_range(ext2fs_generic_bitmap gen_bmap,
          __u64 start, unsigned int num,
          void *in)
{
  ext2fs_generic_bitmap_64 bmap = (ext2fs_generic_bitmap_64) gen_bmap;

  if (!bmap)
    return EINVAL;

  if (EXT2FS_IS_32_BITMAP(bmap)) {
    if ((start+num-1) & ~0xffffffffULL) {
      ext2fs_warn_bitmap2(gen_bmap, EXT2FS_UNMARK_ERROR,
              0xffffffff);
      return EINVAL;
    }
    return ext2fs_set_generic_bitmap_range(gen_bmap, bmap->magic,
                   start, num, in);
  }

  if (!EXT2FS_IS_64_BITMAP(bmap))
    return EINVAL;

  INC_STAT(bmap, set_range_count);

  return bmap->bitmap_ops->set_bmap_range(bmap, start, num, in);
}

errcode_t ext2fs_get_generic_bmap_range(ext2fs_generic_bitmap gen_bmap,
          __u64 start, unsigned int num,
          void *out)
{
  ext2fs_generic_bitmap_64 bmap = (ext2fs_generic_bitmap_64) gen_bmap;

  if (!bmap)
    return EINVAL;

  if (EXT2FS_IS_32_BITMAP(bmap)) {
    if ((start+num-1) & ~0xffffffffULL) {
      ext2fs_warn_bitmap2(gen_bmap,
              EXT2FS_UNMARK_ERROR, 0xffffffff);
      return EINVAL;
    }
    return ext2fs_get_generic_bitmap_range(gen_bmap, bmap->magic,
                   start, num, out);
  }

  if (!EXT2FS_IS_64_BITMAP(bmap))
    return EINVAL;

  INC_STAT(bmap, get_range_count);

  return bmap->bitmap_ops->get_bmap_range(bmap, start, num, out);
}

errcode_t ext2fs_compare_generic_bmap(errcode_t neq,
              ext2fs_generic_bitmap gen_bm1,
              ext2fs_generic_bitmap gen_bm2)
{
  ext2fs_generic_bitmap_64 bm1 = (ext2fs_generic_bitmap_64) gen_bm1;
  ext2fs_generic_bitmap_64 bm2 = (ext2fs_generic_bitmap_64) gen_bm2;
  blk64_t i;

  if (!bm1 || !bm2)
    return EINVAL;
  if (bm1->magic != bm2->magic)
    return EINVAL;

  /* Now we know both bitmaps have the same magic */
  if (EXT2FS_IS_32_BITMAP(bm1))
    return ext2fs_compare_generic_bitmap(bm1->magic, neq,
                 gen_bm1, gen_bm2);

  if (!EXT2FS_IS_64_BITMAP(bm1))
    return EINVAL;

  if ((bm1->start != bm2->start) ||
      (bm1->end != bm2->end))
    return neq;

  for (i = bm1->end - ((bm1->end - bm1->start) % 8); i <= bm1->end; i++)
    if (ext2fs_test_generic_bmap(gen_bm1, i) !=
        ext2fs_test_generic_bmap(gen_bm2, i))
      return neq;

  return 0;
}

void ext2fs_set_generic_bmap_padding(ext2fs_generic_bitmap gen_bmap)
{
  ext2fs_generic_bitmap_64 bmap = (ext2fs_generic_bitmap_64) gen_bmap;
  __u64 start, num;

  if (EXT2FS_IS_32_BITMAP(bmap)) {
    ext2fs_set_generic_bitmap_padding(gen_bmap);
    return;
  }

  start = bmap->end + 1;
  num = bmap->real_end - bmap->end;
  bmap->bitmap_ops->mark_bmap_extent(bmap, start, num);
  /* XXX ought to warn on error */
}

int ext2fs_test_block_bitmap_range2(ext2fs_block_bitmap gen_bmap,
            blk64_t block, unsigned int num)
{
  ext2fs_generic_bitmap_64 bmap = (ext2fs_generic_bitmap_64) gen_bmap;
  __u64 end = block + num;

  if (!bmap)
    return EINVAL;

  if (num == 1)
    return !ext2fs_test_generic_bmap((ext2fs_generic_bitmap)
             bmap, block);

  if (EXT2FS_IS_32_BITMAP(bmap)) {
    if ((block & ~0xffffffffULL) ||
        ((block+num-1) & ~0xffffffffULL)) {
      ext2fs_warn_bitmap2((ext2fs_generic_bitmap) bmap,
              EXT2FS_UNMARK_ERROR, 0xffffffff);
      return EINVAL;
    }
    return ext2fs_test_block_bitmap_range(
      (ext2fs_generic_bitmap) bmap, block, num);
  }

  if (!EXT2FS_IS_64_BITMAP(bmap))
    return EINVAL;

  INC_STAT(bmap, test_ext_count);

  /* convert to clusters if necessary */
  block >>= bmap->cluster_bits;
  end += (1ULL << bmap->cluster_bits) - 1;
  end >>= bmap->cluster_bits;
  num = end - block;

  if ((block < bmap->start) || (block > bmap->end) ||
      (block+num-1 > bmap->end)) {
    ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_TEST, block,
           bmap->description);
    return EINVAL;
  }

  return bmap->bitmap_ops->test_clear_bmap_extent(bmap, block, num);
}

void ext2fs_mark_block_bitmap_range2(ext2fs_block_bitmap gen_bmap,
             blk64_t block, unsigned int num)
{
  ext2fs_generic_bitmap_64 bmap = (ext2fs_generic_bitmap_64) gen_bmap;
  __u64 end = block + num;

  if (!bmap)
    return;

  if (EXT2FS_IS_32_BITMAP(bmap)) {
    if ((block & ~0xffffffffULL) ||
        ((block+num-1) & ~0xffffffffULL)) {
      ext2fs_warn_bitmap2((ext2fs_generic_bitmap) bmap,
              EXT2FS_UNMARK_ERROR, 0xffffffff);
      return;
    }
    ext2fs_mark_block_bitmap_range((ext2fs_generic_bitmap) bmap,
                 block, num);
  }

  if (!EXT2FS_IS_64_BITMAP(bmap))
    return;

  INC_STAT(bmap, mark_ext_count);

  /* convert to clusters if necessary */
  block >>= bmap->cluster_bits;
  end += (1ULL << bmap->cluster_bits) - 1;
  end >>= bmap->cluster_bits;
  num = end - block;

  if ((block < bmap->start) || (block > bmap->end) ||
      (block+num-1 > bmap->end)) {
    ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_MARK, block,
           bmap->description);
    return;
  }

  bmap->bitmap_ops->mark_bmap_extent(bmap, block, num);
}

void ext2fs_unmark_block_bitmap_range2(ext2fs_block_bitmap gen_bmap,
               blk64_t block, unsigned int num)
{
  ext2fs_generic_bitmap_64 bmap = (ext2fs_generic_bitmap_64) gen_bmap;
  __u64 end = block + num;

  if (!bmap)
    return;

  if (EXT2FS_IS_32_BITMAP(bmap)) {
    if ((block & ~0xffffffffULL) ||
        ((block+num-1) & ~0xffffffffULL)) {
      ext2fs_warn_bitmap2((ext2fs_generic_bitmap) bmap,
              EXT2FS_UNMARK_ERROR, 0xffffffff);
      return;
    }
    ext2fs_unmark_block_bitmap_range((ext2fs_generic_bitmap) bmap,
             block, num);
  }

  if (!EXT2FS_IS_64_BITMAP(bmap))
    return;

  INC_STAT(bmap, unmark_ext_count);

  /* convert to clusters if necessary */
  block >>= bmap->cluster_bits;
  end += (1ULL << bmap->cluster_bits) - 1;
  end >>= bmap->cluster_bits;
  num = end - block;

  if ((block < bmap->start) || (block > bmap->end) ||
      (block+num-1 > bmap->end)) {
    ext2fs_warn_bitmap(EXT2_ET_BAD_BLOCK_UNMARK, block,
           bmap->description);
    return;
  }

  bmap->bitmap_ops->unmark_bmap_extent(bmap, block, num);
}

void ext2fs_warn_bitmap32(ext2fs_generic_bitmap gen_bitmap, const char *func)
{
  ext2fs_generic_bitmap_64 bitmap = (ext2fs_generic_bitmap_64) gen_bitmap;

#ifndef OMIT_COM_ERR
  if (bitmap && bitmap->description)
    com_err(0, EXT2_ET_MAGIC_GENERIC_BITMAP,
      "called %s with 64-bit bitmap for %s", func,
      bitmap->description);
  else
    com_err(0, EXT2_ET_MAGIC_GENERIC_BITMAP,
      "called %s with 64-bit bitmap", func);
#endif
}

errcode_t ext2fs_convert_subcluster_bitmap(ext2_filsys fs,
             ext2fs_block_bitmap *bitmap)
{
  ext2fs_generic_bitmap_64 bmap, cmap;
  ext2fs_block_bitmap gen_bmap = *bitmap, gen_cmap;
  errcode_t   retval;
  blk64_t     i, next, b_end, c_end;

  bmap = (ext2fs_generic_bitmap_64) gen_bmap;
  if (fs->cluster_ratio_bits == ext2fs_get_bitmap_granularity(gen_bmap))
    return 0; /* Nothing to do */

  retval = ext2fs_allocate_block_bitmap(fs, "converted cluster bitmap",
                &gen_cmap);
  if (retval)
    return retval;

  cmap = (ext2fs_generic_bitmap_64) gen_cmap;
  i = bmap->start;
  b_end = bmap->end;
  bmap->end = bmap->real_end;
  c_end = cmap->end;
  cmap->end = cmap->real_end;
  while (i < bmap->real_end) {
    retval = ext2fs_find_first_set_block_bitmap2(gen_bmap,
            i, bmap->real_end, &next);
    if (retval)
      break;
    ext2fs_mark_block_bitmap2(gen_cmap, next);
    i = EXT2FS_C2B(fs, EXT2FS_B2C(fs, next) + 1);
  }
  bmap->end = b_end;
  cmap->end = c_end;
  ext2fs_free_block_bitmap(gen_bmap);
  *bitmap = (ext2fs_block_bitmap) cmap;
  return 0;
}

errcode_t ext2fs_find_first_zero_generic_bmap(ext2fs_generic_bitmap bitmap,
                __u64 start, __u64 end, __u64 *out)
{
  ext2fs_generic_bitmap_64 bmap64 = (ext2fs_generic_bitmap_64) bitmap;
  __u64 cstart, cend, cout;
  errcode_t retval;

  if (!bitmap)
    return EINVAL;

  if (EXT2FS_IS_32_BITMAP(bitmap)) {
    blk_t blk = 0;

    if (((start) & ~0xffffffffULL) ||
        ((end) & ~0xffffffffULL)) {
      ext2fs_warn_bitmap2(bitmap, EXT2FS_TEST_ERROR, start);
      return EINVAL;
    }

    retval = ext2fs_find_first_zero_generic_bitmap(bitmap, start,
                     end, &blk);
    if (retval == 0)
      *out = blk;
    return retval;
  }

  if (!EXT2FS_IS_64_BITMAP(bitmap))
    return EINVAL;

  cstart = start >> bmap64->cluster_bits;
  cend = end >> bmap64->cluster_bits;

  if (cstart < bmap64->start || cend > bmap64->end || start > end) {
    warn_bitmap(bmap64, EXT2FS_TEST_ERROR, start);
    return EINVAL;
  }

  if (bmap64->bitmap_ops->find_first_zero) {
    retval = bmap64->bitmap_ops->find_first_zero(bmap64, cstart,
                   cend, &cout);
    if (retval)
      return retval;
  found:
    cout <<= bmap64->cluster_bits;
    *out = (cout >= start) ? cout : start;
    return 0;
  }

  for (cout = cstart; cout <= cend; cout++)
    if (!bmap64->bitmap_ops->test_bmap(bmap64, cout))
      goto found;

  return ENOENT;
}

errcode_t ext2fs_find_first_set_generic_bmap(ext2fs_generic_bitmap bitmap,
               __u64 start, __u64 end, __u64 *out)
{
  ext2fs_generic_bitmap_64 bmap64 = (ext2fs_generic_bitmap_64) bitmap;
  __u64 cstart, cend, cout;
  errcode_t retval;

  if (!bitmap)
    return EINVAL;

  if (EXT2FS_IS_32_BITMAP(bitmap)) {
    blk_t blk = 0;

    if (((start) & ~0xffffffffULL) ||
        ((end) & ~0xffffffffULL)) {
      ext2fs_warn_bitmap2(bitmap, EXT2FS_TEST_ERROR, start);
      return EINVAL;
    }

    retval = ext2fs_find_first_set_generic_bitmap(bitmap, start,
                    end, &blk);
    if (retval == 0)
      *out = blk;
    return retval;
  }

  if (!EXT2FS_IS_64_BITMAP(bitmap))
    return EINVAL;

  cstart = start >> bmap64->cluster_bits;
  cend = end >> bmap64->cluster_bits;

  if (cstart < bmap64->start || cend > bmap64->end || start > end) {
    warn_bitmap(bmap64, EXT2FS_TEST_ERROR, start);
    return EINVAL;
  }

  if (bmap64->bitmap_ops->find_first_set) {
    retval = bmap64->bitmap_ops->find_first_set(bmap64, cstart,
                  cend, &cout);
    if (retval)
      return retval;
  found:
    cout <<= bmap64->cluster_bits;
    *out = (cout >= start) ? cout : start;
    return 0;
  }

  for (cout = cstart; cout <= cend; cout++)
    if (bmap64->bitmap_ops->test_bmap(bmap64, cout))
      goto found;

  return ENOENT;
}

errcode_t ext2fs_count_used_clusters(ext2_filsys fs, blk64_t start,
             blk64_t end, blk64_t *out)
{
  blk64_t   next;
  blk64_t   tot_set = 0;
  errcode_t retval = 0;

  while (start < end) {
    retval = ext2fs_find_first_set_block_bitmap2(fs->block_map,
              start, end, &next);
    if (retval) {
      if (retval == ENOENT)
        retval = 0;
      break;
    }
    start = next;

    retval = ext2fs_find_first_zero_block_bitmap2(fs->block_map,
              start, end, &next);
    if (retval == 0) {
      tot_set += next - start;
      start  = next + 1;
    } else if (retval == ENOENT) {
      retval = 0;
      tot_set += end - start + 1;
      break;
    } else
      break;
  }

  if (!retval)
    *out = EXT2FS_NUM_B2C(fs, tot_set);
  return retval;
}

Coverage Report

Created: 2022-11-24 06:30