source: MondoRescue/branches/2.2.5/mindi-busybox/e2fsprogs/old_e2fsprogs/ext2fs/dblist.c@ 1765

Last change on this file since 1765 was 1765, checked in by Bruno Cornec, 16 years ago

Update to busybox 1.7.2
  • Property svn:eol-style set to native
File size: 5.5 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * dblist.c -- directory block list functions
4 *
5 * Copyright 1997 by Theodore Ts'o
6 *
7 * %Begin-Header%
8 * This file may be redistributed under the terms of the GNU Public
9 * License.
10 * %End-Header%
11 *
12 */
13
14#include <stdio.h>
15#if HAVE_UNISTD_H
16#include <unistd.h>
17#endif
18#include <string.h>
19#include <time.h>
20
21#include "ext2_fs.h"
22#include "ext2fsP.h"
23
24static int dir_block_cmp(const void *a, const void *b);
25
26/*
27 * Returns the number of directories in the filesystem as reported by
28 * the group descriptors. Of course, the group descriptors could be
29 * wrong!
30 */
31errcode_t ext2fs_get_num_dirs(ext2_filsys fs, ext2_ino_t *ret_num_dirs)
32{
33 dgrp_t i;
34 ext2_ino_t num_dirs, max_dirs;
35
36 EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
37
38 num_dirs = 0;
39 max_dirs = fs->super->s_inodes_per_group;
40 for (i = 0; i < fs->group_desc_count; i++) {
41 if (fs->group_desc[i].bg_used_dirs_count > max_dirs)
42 num_dirs += max_dirs / 8;
43 else
44 num_dirs += fs->group_desc[i].bg_used_dirs_count;
45 }
46 if (num_dirs > fs->super->s_inodes_count)
47 num_dirs = fs->super->s_inodes_count;
48
49 *ret_num_dirs = num_dirs;
50
51 return 0;
52}
53
54/*
55 * helper function for making a new directory block list (for
56 * initialize and copy).
57 */
58static errcode_t make_dblist(ext2_filsys fs, ext2_ino_t size, ext2_ino_t count,
59 struct ext2_db_entry *list,
60 ext2_dblist *ret_dblist)
61{
62 ext2_dblist dblist;
63 errcode_t retval;
64 size_t len;
65
66 EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
67
68 if ((ret_dblist == 0) && fs->dblist &&
69 (fs->dblist->magic == EXT2_ET_MAGIC_DBLIST))
70 return 0;
71
72 retval = ext2fs_get_mem(sizeof(struct ext2_struct_dblist), &dblist);
73 if (retval)
74 return retval;
75 memset(dblist, 0, sizeof(struct ext2_struct_dblist));
76
77 dblist->magic = EXT2_ET_MAGIC_DBLIST;
78 dblist->fs = fs;
79 if (size)
80 dblist->size = size;
81 else {
82 retval = ext2fs_get_num_dirs(fs, &dblist->size);
83 if (retval)
84 goto cleanup;
85 dblist->size = (dblist->size * 2) + 12;
86 }
87 len = (size_t) sizeof(struct ext2_db_entry) * dblist->size;
88 dblist->count = count;
89 retval = ext2fs_get_mem(len, &dblist->list);
90 if (retval)
91 goto cleanup;
92
93 if (list)
94 memcpy(dblist->list, list, len);
95 else
96 memset(dblist->list, 0, len);
97 if (ret_dblist)
98 *ret_dblist = dblist;
99 else
100 fs->dblist = dblist;
101 return 0;
102cleanup:
103 ext2fs_free_mem(&dblist);
104 return retval;
105}
106
107/*
108 * Initialize a directory block list
109 */
110errcode_t ext2fs_init_dblist(ext2_filsys fs, ext2_dblist *ret_dblist)
111{
112 ext2_dblist dblist;
113 errcode_t retval;
114
115 retval = make_dblist(fs, 0, 0, 0, &dblist);
116 if (retval)
117 return retval;
118
119 dblist->sorted = 1;
120 if (ret_dblist)
121 *ret_dblist = dblist;
122 else
123 fs->dblist = dblist;
124
125 return 0;
126}
127
128/*
129 * Copy a directory block list
130 */
131errcode_t ext2fs_copy_dblist(ext2_dblist src, ext2_dblist *dest)
132{
133 ext2_dblist dblist;
134 errcode_t retval;
135
136 retval = make_dblist(src->fs, src->size, src->count, src->list,
137 &dblist);
138 if (retval)
139 return retval;
140 dblist->sorted = src->sorted;
141 *dest = dblist;
142 return 0;
143}
144
145/*
146 * Close a directory block list
147 *
148 * (moved to closefs.c)
149 */
150
151
152/*
153 * Add a directory block to the directory block list
154 */
155errcode_t ext2fs_add_dir_block(ext2_dblist dblist, ext2_ino_t ino, blk_t blk,
156 int blockcnt)
157{
158 struct ext2_db_entry *new_entry;
159 errcode_t retval;
160 unsigned long old_size;
161
162 EXT2_CHECK_MAGIC(dblist, EXT2_ET_MAGIC_DBLIST);
163
164 if (dblist->count >= dblist->size) {
165 old_size = dblist->size * sizeof(struct ext2_db_entry);
166 dblist->size += 100;
167 retval = ext2fs_resize_mem(old_size, (size_t) dblist->size *
168 sizeof(struct ext2_db_entry),
169 &dblist->list);
170 if (retval) {
171 dblist->size -= 100;
172 return retval;
173 }
174 }
175 new_entry = dblist->list + ( (int) dblist->count++);
176 new_entry->blk = blk;
177 new_entry->ino = ino;
178 new_entry->blockcnt = blockcnt;
179
180 dblist->sorted = 0;
181
182 return 0;
183}
184
185/*
186 * Change the directory block to the directory block list
187 */
188errcode_t ext2fs_set_dir_block(ext2_dblist dblist, ext2_ino_t ino, blk_t blk,
189 int blockcnt)
190{
191 dgrp_t i;
192
193 EXT2_CHECK_MAGIC(dblist, EXT2_ET_MAGIC_DBLIST);
194
195 for (i=0; i < dblist->count; i++) {
196 if ((dblist->list[i].ino != ino) ||
197 (dblist->list[i].blockcnt != blockcnt))
198 continue;
199 dblist->list[i].blk = blk;
200 dblist->sorted = 0;
201 return 0;
202 }
203 return EXT2_ET_DB_NOT_FOUND;
204}
205
206void ext2fs_dblist_sort(ext2_dblist dblist,
207 int (*sortfunc)(const void *,
208 const void *))
209{
210 if (!sortfunc)
211 sortfunc = dir_block_cmp;
212 qsort(dblist->list, (size_t) dblist->count,
213 sizeof(struct ext2_db_entry), sortfunc);
214 dblist->sorted = 1;
215}
216
217/*
218 * This function iterates over the directory block list
219 */
220errcode_t ext2fs_dblist_iterate(ext2_dblist dblist,
221 int (*func)(ext2_filsys fs,
222 struct ext2_db_entry *db_info,
223 void *priv_data),
224 void *priv_data)
225{
226 ext2_ino_t i;
227 int ret;
228
229 EXT2_CHECK_MAGIC(dblist, EXT2_ET_MAGIC_DBLIST);
230
231 if (!dblist->sorted)
232 ext2fs_dblist_sort(dblist, 0);
233 for (i=0; i < dblist->count; i++) {
234 ret = (*func)(dblist->fs, &dblist->list[(int)i], priv_data);
235 if (ret & DBLIST_ABORT)
236 return 0;
237 }
238 return 0;
239}
240
241static int dir_block_cmp(const void *a, const void *b)
242{
243 const struct ext2_db_entry *db_a =
244 (const struct ext2_db_entry *) a;
245 const struct ext2_db_entry *db_b =
246 (const struct ext2_db_entry *) b;
247
248 if (db_a->blk != db_b->blk)
249 return (int) (db_a->blk - db_b->blk);
250
251 if (db_a->ino != db_b->ino)
252 return (int) (db_a->ino - db_b->ino);
253
254 return (int) (db_a->blockcnt - db_b->blockcnt);
255}
256
257int ext2fs_dblist_count(ext2_dblist dblist)
258{
259 return (int) dblist->count;
260}
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