bitmaps.c revision d1154eb460efe588eaed3d439c1caaca149fa362 
1/*
2 * bitmaps.c --- routines to read, write, and manipulate the inode and
3 * block bitmaps.
4 *
5 * Copyright (C) 1993, 1994, 1995, 1996 Theodore Ts'o.
6 *
7 * %Begin-Header%
8 * This file may be redistributed under the terms of the GNU Library
9 * General Public License, version 2.
10 * %End-Header%
11 */
12
13#include "config.h"
14#include <stdio.h>
15#include <string.h>
16#if HAVE_UNISTD_H
17#include <unistd.h>
18#endif
19#include <fcntl.h>
20#include <time.h>
21#if HAVE_SYS_STAT_H
22#include <sys/stat.h>
23#endif
24#if HAVE_SYS_TYPES_H
25#include <sys/types.h>
26#endif
27
28#include "ext2_fs.h"
29#include "ext2fs.h"
30#include "ext2fsP.h"
31#include "bmap64.h"
32
33void ext2fs_free_inode_bitmap(ext2fs_inode_bitmap bitmap)
34{
35	ext2fs_free_generic_bmap(bitmap);
36}
37
38void ext2fs_free_block_bitmap(ext2fs_block_bitmap bitmap)
39{
40	ext2fs_free_generic_bmap(bitmap);
41}
42
43errcode_t ext2fs_copy_bitmap(ext2fs_generic_bitmap src,
44			     ext2fs_generic_bitmap *dest)
45{
46	return (ext2fs_copy_generic_bmap(src, dest));
47}
48void ext2fs_set_bitmap_padding(ext2fs_generic_bitmap map)
49{
50	ext2fs_set_generic_bmap_padding(map);
51}
52
53errcode_t ext2fs_allocate_inode_bitmap(ext2_filsys fs,
54				       const char *descr,
55				       ext2fs_inode_bitmap *ret)
56{
57	__u64		start, end, real_end;
58
59	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
60
61	fs->write_bitmaps = ext2fs_write_bitmaps;
62
63	start = 1;
64	end = fs->super->s_inodes_count;
65	real_end = (EXT2_INODES_PER_GROUP(fs->super) * fs->group_desc_count);
66
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				  EXT2FS_BMAP64_BITARRAY,
72				  start, end, real_end, descr, ret));
73
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;
78
79	return (ext2fs_make_generic_bitmap(EXT2_ET_MAGIC_INODE_BITMAP, fs,
80					 start, end, real_end,
81					 descr, 0,
82					 (ext2fs_generic_bitmap *) ret));
83}
84
85errcode_t ext2fs_allocate_block_bitmap(ext2_filsys fs,
86				       const char *descr,
87				       ext2fs_block_bitmap *ret)
88{
89	__u64		start, end, real_end;
90
91	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
92
93	fs->write_bitmaps = ext2fs_write_bitmaps;
94
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;
99
100	if (fs->flags & EXT2_FLAG_64BITS)
101		return (ext2fs_alloc_generic_bmap(fs,
102				  EXT2_ET_MAGIC_BLOCK_BITMAP64,
103				  EXT2FS_BMAP64_BITARRAY,
104				  start, end, real_end, descr, ret));
105
106	if ((end > ~0U) || (real_end > ~0U))
107		return EXT2_ET_CANT_USE_LEGACY_BITMAPS;
108
109	return (ext2fs_make_generic_bitmap(EXT2_ET_MAGIC_BLOCK_BITMAP, fs,
110					   start, end, real_end,
111					   descr, 0,
112					   (ext2fs_generic_bitmap *) ret));
113}
114
115/*
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.
121 */
122errcode_t ext2fs_allocate_subcluster_bitmap(ext2_filsys fs,
123					    const char *descr,
124					    ext2fs_block_bitmap *ret)
125{
126	__u64			start, end, real_end;
127	ext2fs_generic_bitmap	bmap;
128	errcode_t		retval;
129
130	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
131
132	fs->write_bitmaps = ext2fs_write_bitmaps;
133
134	if (!fs->cluster_ratio_bits)
135		return ext2fs_allocate_block_bitmap(fs, descr, ret);
136
137	if ((fs->flags & EXT2_FLAG_64BITS) == 0)
138		return EXT2_ET_CANT_USE_LEGACY_BITMAPS;
139
140	start = fs->super->s_first_data_block;
141	end = ext2fs_blocks_count(fs->super)-1;
142	real_end = ((__u64) EXT2_BLOCKS_PER_GROUP(fs->super)
143		    * (__u64) fs->group_desc_count)-1 + start;
144
145	retval = ext2fs_alloc_generic_bmap(fs, EXT2_ET_MAGIC_BLOCK_BITMAP64,
146					   EXT2FS_BMAP64_BITARRAY, start,
147					   end, real_end, descr, &bmap);
148	if (retval)
149		return retval;
150	bmap->cluster_bits = 0;
151	*ret = bmap;
152	return 0;
153}
154
155int ext2fs_get_bitmap_granularity(ext2fs_block_bitmap bitmap)
156{
157	ext2fs_generic_bitmap bmap = bitmap;
158
159	if (!EXT2FS_IS_64_BITMAP(bmap))
160		return 0;
161
162	return bmap->cluster_bits;
163}
164
165errcode_t ext2fs_fudge_inode_bitmap_end(ext2fs_inode_bitmap bitmap,
166					ext2_ino_t end, ext2_ino_t *oend)
167{
168	__u64 tmp_oend;
169	int retval;
170
171	retval = ext2fs_fudge_generic_bmap_end((ext2fs_generic_bitmap) bitmap,
172					       EXT2_ET_FUDGE_INODE_BITMAP_END,
173					       end, &tmp_oend);
174	if (oend)
175		*oend = tmp_oend;
176	return retval;
177}
178
179errcode_t ext2fs_fudge_block_bitmap_end(ext2fs_block_bitmap bitmap,
180					blk_t end, blk_t *oend)
181{
182	return (ext2fs_fudge_generic_bitmap_end(bitmap,
183						EXT2_ET_MAGIC_BLOCK_BITMAP,
184						EXT2_ET_FUDGE_BLOCK_BITMAP_END,
185						end, oend));
186}
187
188errcode_t ext2fs_fudge_block_bitmap_end2(ext2fs_block_bitmap bitmap,
189					 blk64_t end, blk64_t *oend)
190{
191	return (ext2fs_fudge_generic_bmap_end(bitmap,
192					      EXT2_ET_FUDGE_BLOCK_BITMAP_END,
193					      end, oend));
194}
195
196void ext2fs_clear_inode_bitmap(ext2fs_inode_bitmap bitmap)
197{
198	ext2fs_clear_generic_bmap(bitmap);
199}
200
201void ext2fs_clear_block_bitmap(ext2fs_block_bitmap bitmap)
202{
203	ext2fs_clear_generic_bmap(bitmap);
204}
205
206errcode_t ext2fs_resize_inode_bitmap(__u32 new_end, __u32 new_real_end,
207				     ext2fs_inode_bitmap bmap)
208{
209	return (ext2fs_resize_generic_bitmap(EXT2_ET_MAGIC_INODE_BITMAP,
210					     new_end, new_real_end, bmap));
211}
212
213errcode_t ext2fs_resize_inode_bitmap2(__u64 new_end, __u64 new_real_end,
214				      ext2fs_inode_bitmap bmap)
215{
216	return (ext2fs_resize_generic_bmap(bmap, new_end, new_real_end));
217}
218
219errcode_t ext2fs_resize_block_bitmap(__u32 new_end, __u32 new_real_end,
220				     ext2fs_block_bitmap bmap)
221{
222	return (ext2fs_resize_generic_bitmap(EXT2_ET_MAGIC_BLOCK_BITMAP,
223					     new_end, new_real_end, bmap));
224}
225
226errcode_t ext2fs_resize_block_bitmap2(__u64 new_end, __u64 new_real_end,
227				      ext2fs_block_bitmap bmap)
228{
229	return (ext2fs_resize_generic_bmap(bmap, new_end, new_real_end));
230}
231
232errcode_t ext2fs_compare_block_bitmap(ext2fs_block_bitmap bm1,
233				      ext2fs_block_bitmap bm2)
234{
235	return (ext2fs_compare_generic_bmap(EXT2_ET_NEQ_BLOCK_BITMAP,
236					    bm1, bm2));
237}
238
239errcode_t ext2fs_compare_inode_bitmap(ext2fs_inode_bitmap bm1,
240				      ext2fs_inode_bitmap bm2)
241{
242	return (ext2fs_compare_generic_bmap(EXT2_ET_NEQ_INODE_BITMAP,
243					    bm1, bm2));
244}
245
246errcode_t ext2fs_set_inode_bitmap_range(ext2fs_inode_bitmap bmap,
247					ext2_ino_t start, unsigned int num,
248					void *in)
249{
250	return (ext2fs_set_generic_bitmap_range(bmap,
251						EXT2_ET_MAGIC_INODE_BITMAP,
252						start, num, in));
253}
254
255errcode_t ext2fs_set_inode_bitmap_range2(ext2fs_inode_bitmap bmap,
256					 __u64 start, size_t num,
257					 void *in)
258{
259	return (ext2fs_set_generic_bmap_range(bmap, start, num, in));
260}
261
262errcode_t ext2fs_get_inode_bitmap_range(ext2fs_inode_bitmap bmap,
263					ext2_ino_t start, unsigned int num,
264					void *out)
265{
266	return (ext2fs_get_generic_bitmap_range(bmap,
267						EXT2_ET_MAGIC_INODE_BITMAP,
268						start, num, out));
269}
270
271errcode_t ext2fs_get_inode_bitmap_range2(ext2fs_inode_bitmap bmap,
272					 __u64 start, size_t num,
273					 void *out)
274{
275	return (ext2fs_get_generic_bmap_range(bmap, start, num, out));
276}
277
278errcode_t ext2fs_set_block_bitmap_range(ext2fs_block_bitmap bmap,
279					blk_t start, unsigned int num,
280					void *in)
281{
282	return (ext2fs_set_generic_bitmap_range(bmap,
283						EXT2_ET_MAGIC_BLOCK_BITMAP,
284						start, num, in));
285}
286
287errcode_t ext2fs_set_block_bitmap_range2(ext2fs_block_bitmap bmap,
288					 blk64_t start, size_t num,
289					 void *in)
290{
291	return (ext2fs_set_generic_bmap_range(bmap, start, num, in));
292}
293
294errcode_t ext2fs_get_block_bitmap_range(ext2fs_block_bitmap bmap,
295					blk_t start, unsigned int num,
296					void *out)
297{
298	return (ext2fs_get_generic_bitmap_range(bmap,
299						EXT2_ET_MAGIC_BLOCK_BITMAP,
300						start, num, out));
301}
302
303errcode_t ext2fs_get_block_bitmap_range2(ext2fs_block_bitmap bmap,
304					 blk64_t start, size_t num,
305					 void *out)
306{
307	return (ext2fs_get_generic_bmap_range(bmap, start, num, out));
308}
309