2 * dblist.c -- directory block list functions
4 * Copyright 1997 by Theodore Ts'o
7 * This file may be redistributed under the terms of the GNU Library
8 * General Public License, version 2.
23 static EXT2_QSORT_TYPE dir_block_cmp(const void *a, const void *b);
24 static EXT2_QSORT_TYPE dir_block_cmp2(const void *a, const void *b);
25 static EXT2_QSORT_TYPE (*sortfunc32)(const void *a, const void *b);
28 * helper function for making a new directory block list (for
29 * initialize and copy).
31 static errcode_t make_dblist(ext2_filsys fs, ext2_ino_t size,
33 struct ext2_db_entry2 *list,
34 ext2_dblist *ret_dblist)
36 ext2_dblist dblist = NULL;
41 EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
43 if ((ret_dblist == 0) && fs->dblist &&
44 (fs->dblist->magic == EXT2_ET_MAGIC_DBLIST))
47 retval = ext2fs_get_mem(sizeof(struct ext2_struct_dblist), &dblist);
50 memset(dblist, 0, sizeof(struct ext2_struct_dblist));
52 dblist->magic = EXT2_ET_MAGIC_DBLIST;
57 retval = ext2fs_get_num_dirs(fs, &num_dirs);
60 dblist->size = (num_dirs * 2) + 12;
62 len = (size_t) sizeof(struct ext2_db_entry2) * dblist->size;
63 dblist->count = count;
64 retval = ext2fs_get_array(dblist->size, sizeof(struct ext2_db_entry2),
70 memcpy(dblist->list, list, len);
72 memset(dblist->list, 0, len);
80 ext2fs_free_mem(&dblist);
85 * Initialize a directory block list
87 errcode_t ext2fs_init_dblist(ext2_filsys fs, ext2_dblist *ret_dblist)
92 retval = make_dblist(fs, 0, 0, 0, &dblist);
106 * Copy a directory block list
108 errcode_t ext2fs_copy_dblist(ext2_dblist src, ext2_dblist *dest)
113 retval = make_dblist(src->fs, src->size, src->count, src->list,
117 dblist->sorted = src->sorted;
123 * Merge a directory block list @src to @dest
125 errcode_t ext2fs_merge_dblist(ext2_dblist src, ext2_dblist dest)
127 unsigned long long src_count = src->count;
128 unsigned long long dest_count = dest->count;
129 unsigned long long size = src_count + dest_count;
130 size_t size_entry = sizeof(struct ext2_db_entry2);
131 struct ext2_db_entry2 *array, *array2;
137 if (src->sorted || (dest->sorted && dest_count != 0))
140 retval = ext2fs_get_array(size, size_entry, &array);
145 memcpy(array, src->list, src_count * size_entry);
147 memcpy(array, dest->list, dest_count * size_entry);
148 ext2fs_free_mem(&dest->list);
151 dest->count = src_count + dest_count;
159 * Close a directory block list
161 * (moved to closefs.c)
166 * Add a directory block to the directory block list
168 errcode_t ext2fs_add_dir_block2(ext2_dblist dblist, ext2_ino_t ino,
169 blk64_t blk, e2_blkcnt_t blockcnt)
171 struct ext2_db_entry2 *new_entry;
173 unsigned long old_size;
175 EXT2_CHECK_MAGIC(dblist, EXT2_ET_MAGIC_DBLIST);
177 if (dblist->count >= dblist->size) {
178 old_size = dblist->size * sizeof(struct ext2_db_entry2);
179 dblist->size += dblist->size > 200 ? dblist->size / 2 : 100;
180 retval = ext2fs_resize_mem(old_size, (size_t) dblist->size *
181 sizeof(struct ext2_db_entry2),
184 dblist->size = old_size / sizeof(struct ext2_db_entry2);
188 new_entry = dblist->list + ( dblist->count++);
189 new_entry->blk = blk;
190 new_entry->ino = ino;
191 new_entry->blockcnt = blockcnt;
199 * Change the directory block to the directory block list
201 errcode_t ext2fs_set_dir_block2(ext2_dblist dblist, ext2_ino_t ino,
202 blk64_t blk, e2_blkcnt_t blockcnt)
206 EXT2_CHECK_MAGIC(dblist, EXT2_ET_MAGIC_DBLIST);
208 for (i=0; i < dblist->count; i++) {
209 if ((dblist->list[i].ino != ino) ||
210 (dblist->list[i].blockcnt != blockcnt))
212 dblist->list[i].blk = blk;
216 return EXT2_ET_DB_NOT_FOUND;
219 void ext2fs_dblist_sort2(ext2_dblist dblist,
220 EXT2_QSORT_TYPE (*sortfunc)(const void *,
224 sortfunc = dir_block_cmp2;
225 qsort(dblist->list, (size_t) dblist->count,
226 sizeof(struct ext2_db_entry2), sortfunc);
231 * This function iterates over the directory block list
233 errcode_t ext2fs_dblist_iterate3(ext2_dblist dblist,
234 int (*func)(ext2_filsys fs,
235 struct ext2_db_entry2 *db_info,
237 unsigned long long start,
238 unsigned long long count,
241 unsigned long long i, end;
244 EXT2_CHECK_MAGIC(dblist, EXT2_ET_MAGIC_DBLIST);
248 ext2fs_dblist_sort2(dblist, 0);
249 if (end > dblist->count)
251 for (i = start; i < end; i++) {
252 ret = (*func)(dblist->fs, &dblist->list[i], priv_data);
253 if (ret & DBLIST_ABORT)
259 errcode_t ext2fs_dblist_iterate2(ext2_dblist dblist,
260 int (*func)(ext2_filsys fs,
261 struct ext2_db_entry2 *db_info,
265 return ext2fs_dblist_iterate3(dblist, func, 0, dblist->count,
269 static EXT2_QSORT_TYPE dir_block_cmp2(const void *a, const void *b)
271 const struct ext2_db_entry2 *db_a =
272 (const struct ext2_db_entry2 *) a;
273 const struct ext2_db_entry2 *db_b =
274 (const struct ext2_db_entry2 *) b;
276 if (db_a->blk != db_b->blk)
277 return (int) (db_a->blk - db_b->blk);
279 if (db_a->ino != db_b->ino)
280 return (int) (db_a->ino - db_b->ino);
282 return (db_a->blockcnt - db_b->blockcnt);
285 blk64_t ext2fs_dblist_count2(ext2_dblist dblist)
287 return dblist->count;
290 errcode_t ext2fs_dblist_get_last2(ext2_dblist dblist,
291 struct ext2_db_entry2 **entry)
293 EXT2_CHECK_MAGIC(dblist, EXT2_ET_MAGIC_DBLIST);
295 if (dblist->count == 0)
296 return EXT2_ET_DBLIST_EMPTY;
299 *entry = dblist->list + ( dblist->count-1);
303 errcode_t ext2fs_dblist_drop_last(ext2_dblist dblist)
305 EXT2_CHECK_MAGIC(dblist, EXT2_ET_MAGIC_DBLIST);
307 if (dblist->count == 0)
308 return EXT2_ET_DBLIST_EMPTY;
315 * Legacy 32-bit versions
319 * Add a directory block to the directory block list
321 errcode_t ext2fs_add_dir_block(ext2_dblist dblist, ext2_ino_t ino, blk_t blk,
324 return ext2fs_add_dir_block2(dblist, ino, blk, blockcnt);
328 * Change the directory block to the directory block list
330 errcode_t ext2fs_set_dir_block(ext2_dblist dblist, ext2_ino_t ino, blk_t blk,
333 return ext2fs_set_dir_block2(dblist, ino, blk, blockcnt);
336 void ext2fs_dblist_sort(ext2_dblist dblist,
337 EXT2_QSORT_TYPE (*sortfunc)(const void *,
341 sortfunc32 = sortfunc;
342 sortfunc = dir_block_cmp;
344 sortfunc = dir_block_cmp2;
345 qsort(dblist->list, (size_t) dblist->count,
346 sizeof(struct ext2_db_entry2), sortfunc);
351 * This function iterates over the directory block list
353 struct iterate_passthrough {
354 int (*func)(ext2_filsys fs,
355 struct ext2_db_entry *db_info,
360 static int passthrough_func(ext2_filsys fs,
361 struct ext2_db_entry2 *db_info,
364 struct iterate_passthrough *p = priv_data;
365 struct ext2_db_entry db;
368 db.ino = db_info->ino;
369 db.blk = (blk_t) db_info->blk;
370 db.blockcnt = (int) db_info->blockcnt;
371 ret = (p->func)(fs, &db, p->priv_data);
372 db_info->ino = db.ino;
373 db_info->blk = db.blk;
374 db_info->blockcnt = db.blockcnt;
378 errcode_t ext2fs_dblist_iterate(ext2_dblist dblist,
379 int (*func)(ext2_filsys fs,
380 struct ext2_db_entry *db_info,
384 struct iterate_passthrough pass;
386 EXT2_CHECK_MAGIC(dblist, EXT2_ET_MAGIC_DBLIST);
388 pass.priv_data = priv_data;
390 return ext2fs_dblist_iterate2(dblist, passthrough_func, &pass);
393 static EXT2_QSORT_TYPE dir_block_cmp(const void *a, const void *b)
395 const struct ext2_db_entry2 *db_a =
396 (const struct ext2_db_entry2 *) a;
397 const struct ext2_db_entry2 *db_b =
398 (const struct ext2_db_entry2 *) b;
400 struct ext2_db_entry a32, b32;
402 a32.ino = db_a->ino; a32.blk = db_a->blk;
403 a32.blockcnt = db_a->blockcnt;
405 b32.ino = db_b->ino; b32.blk = db_b->blk;
406 b32.blockcnt = db_b->blockcnt;
408 return sortfunc32(&a32, &b32);
411 int ext2fs_dblist_count(ext2_dblist dblist)
413 return dblist->count;
416 errcode_t ext2fs_dblist_get_last(ext2_dblist dblist,
417 struct ext2_db_entry **entry)
419 static struct ext2_db_entry ret_entry;
420 struct ext2_db_entry2 *last;
422 EXT2_CHECK_MAGIC(dblist, EXT2_ET_MAGIC_DBLIST);
424 if (dblist->count == 0)
425 return EXT2_ET_DBLIST_EMPTY;
430 last = dblist->list + dblist->count -1;
432 ret_entry.ino = last->ino;
433 ret_entry.blk = last->blk;
434 ret_entry.blockcnt = last->blockcnt;