summaryrefslogtreecommitdiffstats
path: root/lib/ext2fs/bitmaps.c
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--lib/ext2fs/bitmaps.c320
1 files changed, 320 insertions, 0 deletions
diff --git a/lib/ext2fs/bitmaps.c b/lib/ext2fs/bitmaps.c
new file mode 100644
index 0000000..8bfa24b
--- /dev/null
+++ b/lib/ext2fs/bitmaps.c
@@ -0,0 +1,320 @@
+/*
+ * bitmaps.c --- routines to read, write, and manipulate the inode and
+ * block bitmaps.
+ *
+ * Copyright (C) 1993, 1994, 1995, 1996 Theodore Ts'o.
+ *
+ * %Begin-Header%
+ * This file may be redistributed under the terms of the GNU Library
+ * General Public License, version 2.
+ * %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>
+#if HAVE_SYS_STAT_H
+#include <sys/stat.h>
+#endif
+#if HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+
+#include "ext2_fs.h"
+#include "ext2fs.h"
+#include "ext2fsP.h"
+#include "bmap64.h"
+
+void ext2fs_free_inode_bitmap(ext2fs_inode_bitmap bitmap)
+{
+ ext2fs_free_generic_bmap(bitmap);
+}
+
+void ext2fs_free_block_bitmap(ext2fs_block_bitmap bitmap)
+{
+ ext2fs_free_generic_bmap(bitmap);
+}
+
+errcode_t ext2fs_copy_bitmap(ext2fs_generic_bitmap src,
+ ext2fs_generic_bitmap *dest)
+{
+ return (ext2fs_copy_generic_bmap(src, dest));
+}
+void ext2fs_set_bitmap_padding(ext2fs_generic_bitmap map)
+{
+ ext2fs_set_generic_bmap_padding(map);
+}
+
+errcode_t ext2fs_allocate_inode_bitmap(ext2_filsys fs,
+ const char *descr,
+ ext2fs_inode_bitmap *ret)
+{
+ __u64 start, end, real_end;
+
+ EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
+
+ if (ext2fs_has_feature_journal_dev(fs->super))
+ return EXT2_ET_EXTERNAL_JOURNAL_NOSUPP;
+
+ fs->write_bitmaps = ext2fs_write_bitmaps;
+
+ start = 1;
+ end = fs->super->s_inodes_count;
+ real_end = (__u64)EXT2_INODES_PER_GROUP(fs->super) *
+ fs->group_desc_count;
+
+ /* Are we permitted to use new-style bitmaps? */
+ if (fs->flags & EXT2_FLAG_64BITS)
+ return (ext2fs_alloc_generic_bmap(fs,
+ EXT2_ET_MAGIC_INODE_BITMAP64,
+ fs->default_bitmap_type,
+ start, end, real_end, descr, ret));
+
+ /* Otherwise, check to see if the file system is small enough
+ * to use old-style 32-bit bitmaps */
+ if ((end > ~0U) || (real_end > ~0U))
+ return EXT2_ET_CANT_USE_LEGACY_BITMAPS;
+
+ return (ext2fs_make_generic_bitmap(EXT2_ET_MAGIC_INODE_BITMAP, fs,
+ start, end, real_end,
+ descr, 0,
+ (ext2fs_generic_bitmap *) ret));
+}
+
+errcode_t ext2fs_allocate_block_bitmap(ext2_filsys fs,
+ const char *descr,
+ ext2fs_block_bitmap *ret)
+{
+ __u64 start, end, real_end;
+
+ EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
+
+ if (ext2fs_has_feature_journal_dev(fs->super))
+ return EXT2_ET_EXTERNAL_JOURNAL_NOSUPP;
+
+ fs->write_bitmaps = ext2fs_write_bitmaps;
+
+ start = EXT2FS_B2C(fs, fs->super->s_first_data_block);
+ end = EXT2FS_B2C(fs, ext2fs_blocks_count(fs->super)-1);
+ real_end = ((__u64) EXT2_CLUSTERS_PER_GROUP(fs->super)
+ * (__u64) fs->group_desc_count)-1 + start;
+
+ if (fs->flags & EXT2_FLAG_64BITS)
+ return (ext2fs_alloc_generic_bmap(fs,
+ EXT2_ET_MAGIC_BLOCK_BITMAP64,
+ fs->default_bitmap_type,
+ start, end, real_end, descr, ret));
+
+ if ((end > ~0U) || (real_end > ~0U))
+ return EXT2_ET_CANT_USE_LEGACY_BITMAPS;
+
+ return (ext2fs_make_generic_bitmap(EXT2_ET_MAGIC_BLOCK_BITMAP, fs,
+ start, end, real_end,
+ descr, 0,
+ (ext2fs_generic_bitmap *) ret));
+}
+
+/*
+ * ext2fs_allocate_block_bitmap() really allocates a per-cluster
+ * bitmap for backwards compatibility. This function allocates a
+ * block bitmap which is truly per-block, even if clusters/bigalloc
+ * are enabled. mke2fs and e2fsck need this for tracking the
+ * allocation of the file system metadata blocks.
+ */
+errcode_t ext2fs_allocate_subcluster_bitmap(ext2_filsys fs,
+ const char *descr,
+ ext2fs_block_bitmap *ret)
+{
+ __u64 start, end, real_end;
+ ext2fs_generic_bitmap bmap;
+ ext2fs_generic_bitmap_64 bmap64;
+ errcode_t retval;
+
+ EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
+
+ if (ext2fs_has_feature_journal_dev(fs->super))
+ return EXT2_ET_EXTERNAL_JOURNAL_NOSUPP;
+
+ fs->write_bitmaps = ext2fs_write_bitmaps;
+
+ if (!fs->cluster_ratio_bits)
+ return ext2fs_allocate_block_bitmap(fs, descr, ret);
+
+ if ((fs->flags & EXT2_FLAG_64BITS) == 0)
+ return EXT2_ET_CANT_USE_LEGACY_BITMAPS;
+
+ start = fs->super->s_first_data_block;
+ end = ext2fs_blocks_count(fs->super)-1;
+ real_end = ((__u64) EXT2_BLOCKS_PER_GROUP(fs->super)
+ * (__u64) fs->group_desc_count)-1 + start;
+
+ retval = ext2fs_alloc_generic_bmap(fs, EXT2_ET_MAGIC_BLOCK_BITMAP64,
+ fs->default_bitmap_type, start,
+ end, real_end, descr, &bmap);
+ if (retval)
+ return retval;
+ bmap64 = (ext2fs_generic_bitmap_64) bmap;
+ bmap64->cluster_bits = 0;
+ *ret = bmap;
+ return 0;
+}
+
+int ext2fs_get_bitmap_granularity(ext2fs_block_bitmap bitmap)
+{
+ ext2fs_generic_bitmap_64 bmap = (ext2fs_generic_bitmap_64) bitmap;
+
+ if (!EXT2FS_IS_64_BITMAP(bmap))
+ return 0;
+
+ return bmap->cluster_bits;
+}
+
+errcode_t ext2fs_fudge_inode_bitmap_end(ext2fs_inode_bitmap bitmap,
+ ext2_ino_t end, ext2_ino_t *oend)
+{
+ __u64 tmp_oend;
+ int retval;
+
+ retval = ext2fs_fudge_generic_bmap_end((ext2fs_generic_bitmap) bitmap,
+ EXT2_ET_FUDGE_INODE_BITMAP_END,
+ end, &tmp_oend);
+ if (oend)
+ *oend = tmp_oend;
+ return retval;
+}
+
+errcode_t ext2fs_fudge_block_bitmap_end(ext2fs_block_bitmap bitmap,
+ blk_t end, blk_t *oend)
+{
+ return (ext2fs_fudge_generic_bitmap_end(bitmap,
+ EXT2_ET_MAGIC_BLOCK_BITMAP,
+ EXT2_ET_FUDGE_BLOCK_BITMAP_END,
+ end, oend));
+}
+
+errcode_t ext2fs_fudge_block_bitmap_end2(ext2fs_block_bitmap bitmap,
+ blk64_t end, blk64_t *oend)
+{
+ return (ext2fs_fudge_generic_bmap_end(bitmap,
+ EXT2_ET_FUDGE_BLOCK_BITMAP_END,
+ end, oend));
+}
+
+void ext2fs_clear_inode_bitmap(ext2fs_inode_bitmap bitmap)
+{
+ ext2fs_clear_generic_bmap(bitmap);
+}
+
+void ext2fs_clear_block_bitmap(ext2fs_block_bitmap bitmap)
+{
+ ext2fs_clear_generic_bmap(bitmap);
+}
+
+errcode_t ext2fs_resize_inode_bitmap(__u32 new_end, __u32 new_real_end,
+ ext2fs_inode_bitmap bmap)
+{
+ return (ext2fs_resize_generic_bitmap(EXT2_ET_MAGIC_INODE_BITMAP,
+ new_end, new_real_end, bmap));
+}
+
+errcode_t ext2fs_resize_inode_bitmap2(__u64 new_end, __u64 new_real_end,
+ ext2fs_inode_bitmap bmap)
+{
+ return (ext2fs_resize_generic_bmap(bmap, new_end, new_real_end));
+}
+
+errcode_t ext2fs_resize_block_bitmap(__u32 new_end, __u32 new_real_end,
+ ext2fs_block_bitmap bmap)
+{
+ return (ext2fs_resize_generic_bitmap(EXT2_ET_MAGIC_BLOCK_BITMAP,
+ new_end, new_real_end, bmap));
+}
+
+errcode_t ext2fs_resize_block_bitmap2(__u64 new_end, __u64 new_real_end,
+ ext2fs_block_bitmap bmap)
+{
+ return (ext2fs_resize_generic_bmap(bmap, new_end, new_real_end));
+}
+
+errcode_t ext2fs_compare_block_bitmap(ext2fs_block_bitmap bm1,
+ ext2fs_block_bitmap bm2)
+{
+ return (ext2fs_compare_generic_bmap(EXT2_ET_NEQ_BLOCK_BITMAP,
+ bm1, bm2));
+}
+
+errcode_t ext2fs_compare_inode_bitmap(ext2fs_inode_bitmap bm1,
+ ext2fs_inode_bitmap bm2)
+{
+ return (ext2fs_compare_generic_bmap(EXT2_ET_NEQ_INODE_BITMAP,
+ bm1, bm2));
+}
+
+errcode_t ext2fs_set_inode_bitmap_range(ext2fs_inode_bitmap bmap,
+ ext2_ino_t start, unsigned int num,
+ void *in)
+{
+ return (ext2fs_set_generic_bitmap_range(bmap,
+ EXT2_ET_MAGIC_INODE_BITMAP,
+ start, num, in));
+}
+
+errcode_t ext2fs_set_inode_bitmap_range2(ext2fs_inode_bitmap bmap,
+ __u64 start, size_t num,
+ void *in)
+{
+ return (ext2fs_set_generic_bmap_range(bmap, start, num, in));
+}
+
+errcode_t ext2fs_get_inode_bitmap_range(ext2fs_inode_bitmap bmap,
+ ext2_ino_t start, unsigned int num,
+ void *out)
+{
+ return (ext2fs_get_generic_bitmap_range(bmap,
+ EXT2_ET_MAGIC_INODE_BITMAP,
+ start, num, out));
+}
+
+errcode_t ext2fs_get_inode_bitmap_range2(ext2fs_inode_bitmap bmap,
+ __u64 start, size_t num,
+ void *out)
+{
+ return (ext2fs_get_generic_bmap_range(bmap, start, num, out));
+}
+
+errcode_t ext2fs_set_block_bitmap_range(ext2fs_block_bitmap bmap,
+ blk_t start, unsigned int num,
+ void *in)
+{
+ return (ext2fs_set_generic_bitmap_range(bmap,
+ EXT2_ET_MAGIC_BLOCK_BITMAP,
+ start, num, in));
+}
+
+errcode_t ext2fs_set_block_bitmap_range2(ext2fs_block_bitmap bmap,
+ blk64_t start, size_t num,
+ void *in)
+{
+ return (ext2fs_set_generic_bmap_range(bmap, start, num, in));
+}
+
+errcode_t ext2fs_get_block_bitmap_range(ext2fs_block_bitmap bmap,
+ blk_t start, unsigned int num,
+ void *out)
+{
+ return (ext2fs_get_generic_bitmap_range(bmap,
+ EXT2_ET_MAGIC_BLOCK_BITMAP,
+ start, num, out));
+}
+
+errcode_t ext2fs_get_block_bitmap_range2(ext2fs_block_bitmap bmap,
+ blk64_t start, size_t num,
+ void *out)
+{
+ return (ext2fs_get_generic_bmap_range(bmap, start, num, out));
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-15 02:49:58 +0000