| /* |
| * 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 <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); |
| |
| fs->write_bitmaps = ext2fs_write_bitmaps; |
| |
| start = 1; |
| end = fs->super->s_inodes_count; |
| real_end = (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); |
| |
| 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; |
| errcode_t retval; |
| |
| EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS); |
| |
| 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; |
| bmap->cluster_bits = 0; |
| *ret = bmap; |
| return 0; |
| } |
| |
| int ext2fs_get_bitmap_granularity(ext2fs_block_bitmap bitmap) |
| { |
| ext2fs_generic_bitmap bmap = 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)); |
| } |
