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.
25 #include <sys/types.h>
33 void ext2fs_free_inode_bitmap(ext2fs_inode_bitmap bitmap)
35 ext2fs_free_generic_bmap(bitmap);
38 void ext2fs_free_block_bitmap(ext2fs_block_bitmap bitmap)
40 ext2fs_free_generic_bmap(bitmap);
43 errcode_t ext2fs_copy_bitmap(ext2fs_generic_bitmap src,
44 ext2fs_generic_bitmap *dest)
46 return (ext2fs_copy_generic_bmap(src, dest));
48 void ext2fs_set_bitmap_padding(ext2fs_generic_bitmap map)
50 ext2fs_set_generic_bmap_padding(map);
53 errcode_t ext2fs_allocate_inode_bitmap(ext2_filsys fs,
55 ext2fs_inode_bitmap *ret)
57 __u64 start, end, real_end;
59 EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
61 fs->write_bitmaps = ext2fs_write_bitmaps;
64 end = fs->super->s_inodes_count;
65 real_end = (EXT2_INODES_PER_GROUP(fs->super) * fs->group_desc_count);
67 /* Are we permitted to use new-style bitmaps? */
68 if (fs->flags & EXT2_FLAG_64BITS)
69 return (ext2fs_alloc_generic_bmap(fs,
70 EXT2_ET_MAGIC_INODE_BITMAP64,
71 fs->default_bitmap_type,
72 start, end, real_end, descr, ret));
74 /* Otherwise, check to see if the file system is small enough
75 * to use old-style 32-bit bitmaps */
76 if ((end > ~0U) || (real_end > ~0U))
77 return EXT2_ET_CANT_USE_LEGACY_BITMAPS;
79 return (ext2fs_make_generic_bitmap(EXT2_ET_MAGIC_INODE_BITMAP, fs,
82 (ext2fs_generic_bitmap *) ret));
85 errcode_t ext2fs_allocate_block_bitmap(ext2_filsys fs,
87 ext2fs_block_bitmap *ret)
89 __u64 start, end, real_end;
91 EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
93 fs->write_bitmaps = ext2fs_write_bitmaps;
95 start = EXT2FS_B2C(fs, fs->super->s_first_data_block);
96 end = EXT2FS_B2C(fs, ext2fs_blocks_count(fs->super)-1);
97 real_end = ((__u64) EXT2_CLUSTERS_PER_GROUP(fs->super)
98 * (__u64) fs->group_desc_count)-1 + start;
100 if (fs->flags & EXT2_FLAG_64BITS)
101 return (ext2fs_alloc_generic_bmap(fs,
102 EXT2_ET_MAGIC_BLOCK_BITMAP64,
103 fs->default_bitmap_type,
104 start, end, real_end, descr, ret));
106 if ((end > ~0U) || (real_end > ~0U))
107 return EXT2_ET_CANT_USE_LEGACY_BITMAPS;
109 return (ext2fs_make_generic_bitmap(EXT2_ET_MAGIC_BLOCK_BITMAP, fs,
110 start, end, real_end,
112 (ext2fs_generic_bitmap *) ret));
116 * ext2fs_allocate_block_bitmap() really allocates a per-cluster
117 * bitmap for backwards compatibility. This function allocates a
118 * block bitmap which is truly per-block, even if clusters/bigalloc
119 * are enabled. mke2fs and e2fsck need this for tracking the
120 * allocation of the file system metadata blocks.
122 errcode_t ext2fs_allocate_subcluster_bitmap(ext2_filsys fs,
124 ext2fs_block_bitmap *ret)
126 __u64 start, end, real_end;
127 ext2fs_generic_bitmap bmap;
128 ext2fs_generic_bitmap_64 bmap64;
131 EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
133 fs->write_bitmaps = ext2fs_write_bitmaps;
135 if (!fs->cluster_ratio_bits)
136 return ext2fs_allocate_block_bitmap(fs, descr, ret);
138 if ((fs->flags & EXT2_FLAG_64BITS) == 0)
139 return EXT2_ET_CANT_USE_LEGACY_BITMAPS;
141 start = fs->super->s_first_data_block;
142 end = ext2fs_blocks_count(fs->super)-1;
143 real_end = ((__u64) EXT2_BLOCKS_PER_GROUP(fs->super)
144 * (__u64) fs->group_desc_count)-1 + start;
146 retval = ext2fs_alloc_generic_bmap(fs, EXT2_ET_MAGIC_BLOCK_BITMAP64,
147 fs->default_bitmap_type, start,
148 end, real_end, descr, &bmap);
151 bmap64 = (ext2fs_generic_bitmap_64) bmap;
152 bmap64->cluster_bits = 0;
157 int ext2fs_get_bitmap_granularity(ext2fs_block_bitmap bitmap)
159 ext2fs_generic_bitmap_64 bmap = (ext2fs_generic_bitmap_64) bitmap;
161 if (!EXT2FS_IS_64_BITMAP(bmap))
164 return bmap->cluster_bits;
167 errcode_t ext2fs_fudge_inode_bitmap_end(ext2fs_inode_bitmap bitmap,
168 ext2_ino_t end, ext2_ino_t *oend)
173 retval = ext2fs_fudge_generic_bmap_end((ext2fs_generic_bitmap) bitmap,
174 EXT2_ET_FUDGE_INODE_BITMAP_END,
181 errcode_t ext2fs_fudge_block_bitmap_end(ext2fs_block_bitmap bitmap,
182 blk_t end, blk_t *oend)
184 return (ext2fs_fudge_generic_bitmap_end(bitmap,
185 EXT2_ET_MAGIC_BLOCK_BITMAP,
186 EXT2_ET_FUDGE_BLOCK_BITMAP_END,
190 errcode_t ext2fs_fudge_block_bitmap_end2(ext2fs_block_bitmap bitmap,
191 blk64_t end, blk64_t *oend)
193 return (ext2fs_fudge_generic_bmap_end(bitmap,
194 EXT2_ET_FUDGE_BLOCK_BITMAP_END,
198 void ext2fs_clear_inode_bitmap(ext2fs_inode_bitmap bitmap)
200 ext2fs_clear_generic_bmap(bitmap);
203 void ext2fs_clear_block_bitmap(ext2fs_block_bitmap bitmap)
205 ext2fs_clear_generic_bmap(bitmap);
208 errcode_t ext2fs_resize_inode_bitmap(__u32 new_end, __u32 new_real_end,
209 ext2fs_inode_bitmap bmap)
211 return (ext2fs_resize_generic_bitmap(EXT2_ET_MAGIC_INODE_BITMAP,
212 new_end, new_real_end, bmap));
215 errcode_t ext2fs_resize_inode_bitmap2(__u64 new_end, __u64 new_real_end,
216 ext2fs_inode_bitmap bmap)
218 return (ext2fs_resize_generic_bmap(bmap, new_end, new_real_end));
221 errcode_t ext2fs_resize_block_bitmap(__u32 new_end, __u32 new_real_end,
222 ext2fs_block_bitmap bmap)
224 return (ext2fs_resize_generic_bitmap(EXT2_ET_MAGIC_BLOCK_BITMAP,
225 new_end, new_real_end, bmap));
228 errcode_t ext2fs_resize_block_bitmap2(__u64 new_end, __u64 new_real_end,
229 ext2fs_block_bitmap bmap)
231 return (ext2fs_resize_generic_bmap(bmap, new_end, new_real_end));
234 errcode_t ext2fs_compare_block_bitmap(ext2fs_block_bitmap bm1,
235 ext2fs_block_bitmap bm2)
237 return (ext2fs_compare_generic_bmap(EXT2_ET_NEQ_BLOCK_BITMAP,
241 errcode_t ext2fs_compare_inode_bitmap(ext2fs_inode_bitmap bm1,
242 ext2fs_inode_bitmap bm2)
244 return (ext2fs_compare_generic_bmap(EXT2_ET_NEQ_INODE_BITMAP,
248 errcode_t ext2fs_set_inode_bitmap_range(ext2fs_inode_bitmap bmap,
249 ext2_ino_t start, unsigned int num,
252 return (ext2fs_set_generic_bitmap_range(bmap,
253 EXT2_ET_MAGIC_INODE_BITMAP,
257 errcode_t ext2fs_set_inode_bitmap_range2(ext2fs_inode_bitmap bmap,
258 __u64 start, size_t num,
261 return (ext2fs_set_generic_bmap_range(bmap, start, num, in));
264 errcode_t ext2fs_get_inode_bitmap_range(ext2fs_inode_bitmap bmap,
265 ext2_ino_t start, unsigned int num,
268 return (ext2fs_get_generic_bitmap_range(bmap,
269 EXT2_ET_MAGIC_INODE_BITMAP,
273 errcode_t ext2fs_get_inode_bitmap_range2(ext2fs_inode_bitmap bmap,
274 __u64 start, size_t num,
277 return (ext2fs_get_generic_bmap_range(bmap, start, num, out));
280 errcode_t ext2fs_set_block_bitmap_range(ext2fs_block_bitmap bmap,
281 blk_t start, unsigned int num,
284 return (ext2fs_set_generic_bitmap_range(bmap,
285 EXT2_ET_MAGIC_BLOCK_BITMAP,
289 errcode_t ext2fs_set_block_bitmap_range2(ext2fs_block_bitmap bmap,
290 blk64_t start, size_t num,
293 return (ext2fs_set_generic_bmap_range(bmap, start, num, in));
296 errcode_t ext2fs_get_block_bitmap_range(ext2fs_block_bitmap bmap,
297 blk_t start, unsigned int num,
300 return (ext2fs_get_generic_bitmap_range(bmap,
301 EXT2_ET_MAGIC_BLOCK_BITMAP,
305 errcode_t ext2fs_get_block_bitmap_range2(ext2fs_block_bitmap bmap,
306 blk64_t start, size_t num,
309 return (ext2fs_get_generic_bmap_range(bmap, start, num, out));