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 = (__u64)EXT2_INODES_PER_GROUP(fs->super) *
68 /* Are we permitted to use new-style bitmaps? */
69 if (fs->flags & EXT2_FLAG_64BITS)
70 return (ext2fs_alloc_generic_bmap(fs,
71 EXT2_ET_MAGIC_INODE_BITMAP64,
72 fs->default_bitmap_type,
73 start, end, real_end, descr, ret));
75 /* Otherwise, check to see if the file system is small enough
76 * to use old-style 32-bit bitmaps */
77 if ((end > ~0U) || (real_end > ~0U))
78 return EXT2_ET_CANT_USE_LEGACY_BITMAPS;
80 return (ext2fs_make_generic_bitmap(EXT2_ET_MAGIC_INODE_BITMAP, fs,
83 (ext2fs_generic_bitmap *) ret));
86 errcode_t ext2fs_allocate_block_bitmap(ext2_filsys fs,
88 ext2fs_block_bitmap *ret)
90 __u64 start, end, real_end;
92 EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
94 fs->write_bitmaps = ext2fs_write_bitmaps;
96 start = EXT2FS_B2C(fs, fs->super->s_first_data_block);
97 end = EXT2FS_B2C(fs, ext2fs_blocks_count(fs->super)-1);
98 real_end = ((__u64) EXT2_CLUSTERS_PER_GROUP(fs->super)
99 * (__u64) fs->group_desc_count)-1 + start;
101 if (fs->flags & EXT2_FLAG_64BITS)
102 return (ext2fs_alloc_generic_bmap(fs,
103 EXT2_ET_MAGIC_BLOCK_BITMAP64,
104 fs->default_bitmap_type,
105 start, end, real_end, descr, ret));
107 if ((end > ~0U) || (real_end > ~0U))
108 return EXT2_ET_CANT_USE_LEGACY_BITMAPS;
110 return (ext2fs_make_generic_bitmap(EXT2_ET_MAGIC_BLOCK_BITMAP, fs,
111 start, end, real_end,
113 (ext2fs_generic_bitmap *) ret));
117 * ext2fs_allocate_block_bitmap() really allocates a per-cluster
118 * bitmap for backwards compatibility. This function allocates a
119 * block bitmap which is truly per-block, even if clusters/bigalloc
120 * are enabled. mke2fs and e2fsck need this for tracking the
121 * allocation of the file system metadata blocks.
123 errcode_t ext2fs_allocate_subcluster_bitmap(ext2_filsys fs,
125 ext2fs_block_bitmap *ret)
127 __u64 start, end, real_end;
128 ext2fs_generic_bitmap bmap;
129 ext2fs_generic_bitmap_64 bmap64;
132 EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
134 fs->write_bitmaps = ext2fs_write_bitmaps;
136 if (!fs->cluster_ratio_bits)
137 return ext2fs_allocate_block_bitmap(fs, descr, ret);
139 if ((fs->flags & EXT2_FLAG_64BITS) == 0)
140 return EXT2_ET_CANT_USE_LEGACY_BITMAPS;
142 start = fs->super->s_first_data_block;
143 end = ext2fs_blocks_count(fs->super)-1;
144 real_end = ((__u64) EXT2_BLOCKS_PER_GROUP(fs->super)
145 * (__u64) fs->group_desc_count)-1 + start;
147 retval = ext2fs_alloc_generic_bmap(fs, EXT2_ET_MAGIC_BLOCK_BITMAP64,
148 fs->default_bitmap_type, start,
149 end, real_end, descr, &bmap);
152 bmap64 = (ext2fs_generic_bitmap_64) bmap;
153 bmap64->cluster_bits = 0;
158 int ext2fs_get_bitmap_granularity(ext2fs_block_bitmap bitmap)
160 ext2fs_generic_bitmap_64 bmap = (ext2fs_generic_bitmap_64) bitmap;
162 if (!EXT2FS_IS_64_BITMAP(bmap))
165 return bmap->cluster_bits;
168 errcode_t ext2fs_fudge_inode_bitmap_end(ext2fs_inode_bitmap bitmap,
169 ext2_ino_t end, ext2_ino_t *oend)
174 retval = ext2fs_fudge_generic_bmap_end((ext2fs_generic_bitmap) bitmap,
175 EXT2_ET_FUDGE_INODE_BITMAP_END,
182 errcode_t ext2fs_fudge_block_bitmap_end(ext2fs_block_bitmap bitmap,
183 blk_t end, blk_t *oend)
185 return (ext2fs_fudge_generic_bitmap_end(bitmap,
186 EXT2_ET_MAGIC_BLOCK_BITMAP,
187 EXT2_ET_FUDGE_BLOCK_BITMAP_END,
191 errcode_t ext2fs_fudge_block_bitmap_end2(ext2fs_block_bitmap bitmap,
192 blk64_t end, blk64_t *oend)
194 return (ext2fs_fudge_generic_bmap_end(bitmap,
195 EXT2_ET_FUDGE_BLOCK_BITMAP_END,
199 void ext2fs_clear_inode_bitmap(ext2fs_inode_bitmap bitmap)
201 ext2fs_clear_generic_bmap(bitmap);
204 void ext2fs_clear_block_bitmap(ext2fs_block_bitmap bitmap)
206 ext2fs_clear_generic_bmap(bitmap);
209 errcode_t ext2fs_resize_inode_bitmap(__u32 new_end, __u32 new_real_end,
210 ext2fs_inode_bitmap bmap)
212 return (ext2fs_resize_generic_bitmap(EXT2_ET_MAGIC_INODE_BITMAP,
213 new_end, new_real_end, bmap));
216 errcode_t ext2fs_resize_inode_bitmap2(__u64 new_end, __u64 new_real_end,
217 ext2fs_inode_bitmap bmap)
219 return (ext2fs_resize_generic_bmap(bmap, new_end, new_real_end));
222 errcode_t ext2fs_resize_block_bitmap(__u32 new_end, __u32 new_real_end,
223 ext2fs_block_bitmap bmap)
225 return (ext2fs_resize_generic_bitmap(EXT2_ET_MAGIC_BLOCK_BITMAP,
226 new_end, new_real_end, bmap));
229 errcode_t ext2fs_resize_block_bitmap2(__u64 new_end, __u64 new_real_end,
230 ext2fs_block_bitmap bmap)
232 return (ext2fs_resize_generic_bmap(bmap, new_end, new_real_end));
235 errcode_t ext2fs_compare_block_bitmap(ext2fs_block_bitmap bm1,
236 ext2fs_block_bitmap bm2)
238 return (ext2fs_compare_generic_bmap(EXT2_ET_NEQ_BLOCK_BITMAP,
242 errcode_t ext2fs_compare_inode_bitmap(ext2fs_inode_bitmap bm1,
243 ext2fs_inode_bitmap bm2)
245 return (ext2fs_compare_generic_bmap(EXT2_ET_NEQ_INODE_BITMAP,
249 errcode_t ext2fs_set_inode_bitmap_range(ext2fs_inode_bitmap bmap,
250 ext2_ino_t start, unsigned int num,
253 return (ext2fs_set_generic_bitmap_range(bmap,
254 EXT2_ET_MAGIC_INODE_BITMAP,
258 errcode_t ext2fs_set_inode_bitmap_range2(ext2fs_inode_bitmap bmap,
259 __u64 start, size_t num,
262 return (ext2fs_set_generic_bmap_range(bmap, start, num, in));
265 errcode_t ext2fs_get_inode_bitmap_range(ext2fs_inode_bitmap bmap,
266 ext2_ino_t start, unsigned int num,
269 return (ext2fs_get_generic_bitmap_range(bmap,
270 EXT2_ET_MAGIC_INODE_BITMAP,
274 errcode_t ext2fs_get_inode_bitmap_range2(ext2fs_inode_bitmap bmap,
275 __u64 start, size_t num,
278 return (ext2fs_get_generic_bmap_range(bmap, start, num, out));
281 errcode_t ext2fs_set_block_bitmap_range(ext2fs_block_bitmap bmap,
282 blk_t start, unsigned int num,
285 return (ext2fs_set_generic_bitmap_range(bmap,
286 EXT2_ET_MAGIC_BLOCK_BITMAP,
290 errcode_t ext2fs_set_block_bitmap_range2(ext2fs_block_bitmap bmap,
291 blk64_t start, size_t num,
294 return (ext2fs_set_generic_bmap_range(bmap, start, num, in));
297 errcode_t ext2fs_get_block_bitmap_range(ext2fs_block_bitmap bmap,
298 blk_t start, unsigned int num,
301 return (ext2fs_get_generic_bitmap_range(bmap,
302 EXT2_ET_MAGIC_BLOCK_BITMAP,
306 errcode_t ext2fs_get_block_bitmap_range2(ext2fs_block_bitmap bmap,
307 blk64_t start, size_t num,
310 return (ext2fs_get_generic_bmap_range(bmap, start, num, out));