2 * bitmaps.c --- routines to read, write, and manipulate the inode and
5 * Copyright (C) 1993, 1994, 1995, 1996 Theodore Ts'o.
8 * This file may be redistributed under the terms of the GNU Library
9 * General Public License, version 2.
24 #include <sys/types.h>
32 void ext2fs_free_inode_bitmap(ext2fs_inode_bitmap bitmap
)
34 ext2fs_free_generic_bmap(bitmap
);
37 void ext2fs_free_block_bitmap(ext2fs_block_bitmap bitmap
)
39 ext2fs_free_generic_bmap(bitmap
);
42 errcode_t
ext2fs_copy_bitmap(ext2fs_generic_bitmap src
,
43 ext2fs_generic_bitmap
*dest
)
45 return (ext2fs_copy_generic_bmap(src
, dest
));
47 void ext2fs_set_bitmap_padding(ext2fs_generic_bitmap map
)
49 ext2fs_set_generic_bmap_padding(map
);
52 errcode_t
ext2fs_allocate_inode_bitmap(ext2_filsys fs
,
54 ext2fs_inode_bitmap
*ret
)
56 __u64 start
, end
, real_end
;
58 EXT2_CHECK_MAGIC(fs
, EXT2_ET_MAGIC_EXT2FS_FILSYS
);
60 fs
->write_bitmaps
= ext2fs_write_bitmaps
;
63 end
= fs
->super
->s_inodes_count
;
64 real_end
= (EXT2_INODES_PER_GROUP(fs
->super
) * fs
->group_desc_count
);
66 /* Are we permitted to use new-style bitmaps? */
67 if (fs
->flags
& EXT2_FLAG_64BITS
)
68 return (ext2fs_alloc_generic_bmap(fs
,
69 EXT2_ET_MAGIC_INODE_BITMAP64
,
70 EXT2FS_BMAP64_BITARRAY
,
71 start
, end
, real_end
, descr
, ret
));
73 /* Otherwise, check to see if the file system is small enough
74 * to use old-style 32-bit bitmaps */
75 if ((end
> ~0U) || (real_end
> ~0U))
76 return EXT2_ET_CANT_USE_LEGACY_BITMAPS
;
78 return (ext2fs_make_generic_bitmap(EXT2_ET_MAGIC_INODE_BITMAP
, fs
,
81 (ext2fs_generic_bitmap
*) ret
));
84 errcode_t
ext2fs_allocate_block_bitmap(ext2_filsys fs
,
86 ext2fs_block_bitmap
*ret
)
88 __u64 start
, end
, real_end
;
90 EXT2_CHECK_MAGIC(fs
, EXT2_ET_MAGIC_EXT2FS_FILSYS
);
92 fs
->write_bitmaps
= ext2fs_write_bitmaps
;
94 start
= EXT2FS_B2C(fs
, fs
->super
->s_first_data_block
);
95 end
= EXT2FS_B2C(fs
, ext2fs_blocks_count(fs
->super
)-1);
96 real_end
= ((__u64
) EXT2_CLUSTERS_PER_GROUP(fs
->super
)
97 * (__u64
) fs
->group_desc_count
)-1 + start
;
99 if (fs
->flags
& EXT2_FLAG_64BITS
)
100 return (ext2fs_alloc_generic_bmap(fs
,
101 EXT2_ET_MAGIC_BLOCK_BITMAP64
,
102 EXT2FS_BMAP64_BITARRAY
,
103 start
, end
, real_end
, descr
, ret
));
105 if ((end
> ~0U) || (real_end
> ~0U))
106 return EXT2_ET_CANT_USE_LEGACY_BITMAPS
;
108 return (ext2fs_make_generic_bitmap(EXT2_ET_MAGIC_BLOCK_BITMAP
, fs
,
109 start
, end
, real_end
,
111 (ext2fs_generic_bitmap
*) ret
));
115 * ext2fs_allocate_block_bitmap() really allocates a per-cluster
116 * bitmap for backwards compatibility. This function allocates a
117 * block bitmap which is truly per-block, even if clusters/bigalloc
118 * are enabled. mke2fs and e2fsck need this for tracking the
119 * allocation of the file system metadata blocks.
121 errcode_t
ext2fs_allocate_subcluster_bitmap(ext2_filsys fs
,
123 ext2fs_block_bitmap
*ret
)
125 __u64 start
, end
, real_end
;
126 ext2fs_generic_bitmap bmap
;
129 EXT2_CHECK_MAGIC(fs
, EXT2_ET_MAGIC_EXT2FS_FILSYS
);
131 fs
->write_bitmaps
= ext2fs_write_bitmaps
;
133 if (!fs
->cluster_ratio_bits
)
134 return ext2fs_allocate_block_bitmap(fs
, descr
, ret
);
136 if ((fs
->flags
& EXT2_FLAG_64BITS
) == 0)
137 return EXT2_ET_CANT_USE_LEGACY_BITMAPS
;
139 start
= fs
->super
->s_first_data_block
;
140 end
= ext2fs_blocks_count(fs
->super
)-1;
141 real_end
= ((__u64
) EXT2_BLOCKS_PER_GROUP(fs
->super
)
142 * (__u64
) fs
->group_desc_count
)-1 + start
;
144 retval
= ext2fs_alloc_generic_bmap(fs
, EXT2_ET_MAGIC_BLOCK_BITMAP64
,
145 EXT2FS_BMAP64_BITARRAY
, start
,
146 end
, real_end
, descr
, &bmap
);
149 bmap
->cluster_bits
= 0;
154 int ext2fs_get_bitmap_granularity(ext2fs_block_bitmap bitmap
)
156 ext2fs_generic_bitmap bmap
= bitmap
;
158 if (!EXT2FS_IS_64_BITMAP(bmap
))
161 return bmap
->cluster_bits
;
164 errcode_t
ext2fs_fudge_inode_bitmap_end(ext2fs_inode_bitmap bitmap
,
165 ext2_ino_t end
, ext2_ino_t
*oend
)
170 retval
= ext2fs_fudge_generic_bmap_end((ext2fs_generic_bitmap
) bitmap
,
171 EXT2_ET_FUDGE_INODE_BITMAP_END
,
178 errcode_t
ext2fs_fudge_block_bitmap_end(ext2fs_block_bitmap bitmap
,
179 blk_t end
, blk_t
*oend
)
181 return (ext2fs_fudge_generic_bitmap_end(bitmap
,
182 EXT2_ET_MAGIC_BLOCK_BITMAP
,
183 EXT2_ET_FUDGE_BLOCK_BITMAP_END
,
187 errcode_t
ext2fs_fudge_block_bitmap_end2(ext2fs_block_bitmap bitmap
,
188 blk64_t end
, blk64_t
*oend
)
190 return (ext2fs_fudge_generic_bmap_end(bitmap
,
191 EXT2_ET_FUDGE_BLOCK_BITMAP_END
,
195 void ext2fs_clear_inode_bitmap(ext2fs_inode_bitmap bitmap
)
197 ext2fs_clear_generic_bmap(bitmap
);
200 void ext2fs_clear_block_bitmap(ext2fs_block_bitmap bitmap
)
202 ext2fs_clear_generic_bmap(bitmap
);
205 errcode_t
ext2fs_resize_inode_bitmap(__u32 new_end
, __u32 new_real_end
,
206 ext2fs_inode_bitmap bmap
)
208 return (ext2fs_resize_generic_bitmap(EXT2_ET_MAGIC_INODE_BITMAP
,
209 new_end
, new_real_end
, bmap
));
212 errcode_t
ext2fs_resize_inode_bitmap2(__u64 new_end
, __u64 new_real_end
,
213 ext2fs_inode_bitmap bmap
)
215 return (ext2fs_resize_generic_bmap(bmap
, new_end
, new_real_end
));
218 errcode_t
ext2fs_resize_block_bitmap(__u32 new_end
, __u32 new_real_end
,
219 ext2fs_block_bitmap bmap
)
221 return (ext2fs_resize_generic_bitmap(EXT2_ET_MAGIC_BLOCK_BITMAP
,
222 new_end
, new_real_end
, bmap
));
225 errcode_t
ext2fs_resize_block_bitmap2(__u64 new_end
, __u64 new_real_end
,
226 ext2fs_block_bitmap bmap
)
228 return (ext2fs_resize_generic_bmap(bmap
, new_end
, new_real_end
));
231 errcode_t
ext2fs_compare_block_bitmap(ext2fs_block_bitmap bm1
,
232 ext2fs_block_bitmap bm2
)
234 return (ext2fs_compare_generic_bmap(EXT2_ET_NEQ_BLOCK_BITMAP
,
238 errcode_t
ext2fs_compare_inode_bitmap(ext2fs_inode_bitmap bm1
,
239 ext2fs_inode_bitmap bm2
)
241 return (ext2fs_compare_generic_bmap(EXT2_ET_NEQ_INODE_BITMAP
,
245 errcode_t
ext2fs_set_inode_bitmap_range(ext2fs_inode_bitmap bmap
,
246 ext2_ino_t start
, unsigned int num
,
249 return (ext2fs_set_generic_bitmap_range(bmap
,
250 EXT2_ET_MAGIC_INODE_BITMAP
,
254 errcode_t
ext2fs_set_inode_bitmap_range2(ext2fs_inode_bitmap bmap
,
255 __u64 start
, size_t num
,
258 return (ext2fs_set_generic_bmap_range(bmap
, start
, num
, in
));
261 errcode_t
ext2fs_get_inode_bitmap_range(ext2fs_inode_bitmap bmap
,
262 ext2_ino_t start
, unsigned int num
,
265 return (ext2fs_get_generic_bitmap_range(bmap
,
266 EXT2_ET_MAGIC_INODE_BITMAP
,
270 errcode_t
ext2fs_get_inode_bitmap_range2(ext2fs_inode_bitmap bmap
,
271 __u64 start
, size_t num
,
274 return (ext2fs_get_generic_bmap_range(bmap
, start
, num
, out
));
277 errcode_t
ext2fs_set_block_bitmap_range(ext2fs_block_bitmap bmap
,
278 blk_t start
, unsigned int num
,
281 return (ext2fs_set_generic_bitmap_range(bmap
,
282 EXT2_ET_MAGIC_BLOCK_BITMAP
,
286 errcode_t
ext2fs_set_block_bitmap_range2(ext2fs_block_bitmap bmap
,
287 blk64_t start
, size_t num
,
290 return (ext2fs_set_generic_bmap_range(bmap
, start
, num
, in
));
293 errcode_t
ext2fs_get_block_bitmap_range(ext2fs_block_bitmap bmap
,
294 blk_t start
, unsigned int num
,
297 return (ext2fs_get_generic_bitmap_range(bmap
,
298 EXT2_ET_MAGIC_BLOCK_BITMAP
,
302 errcode_t
ext2fs_get_block_bitmap_range2(ext2fs_block_bitmap bmap
,
303 blk64_t start
, size_t num
,
306 return (ext2fs_get_generic_bmap_range(bmap
, start
, num
, out
));