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 * Close a directory block list
125 * (moved to closefs.c)
130 * Add a directory block to the directory block list
132 errcode_t ext2fs_add_dir_block2(ext2_dblist dblist, ext2_ino_t ino,
133 blk64_t blk, e2_blkcnt_t blockcnt)
135 struct ext2_db_entry2 *new_entry;
137 unsigned long old_size;
139 EXT2_CHECK_MAGIC(dblist, EXT2_ET_MAGIC_DBLIST);
141 if (dblist->count >= dblist->size) {
142 old_size = dblist->size * sizeof(struct ext2_db_entry2);
143 dblist->size += dblist->size > 200 ? dblist->size / 2 : 100;
144 retval = ext2fs_resize_mem(old_size, (size_t) dblist->size *
145 sizeof(struct ext2_db_entry2),
148 dblist->size = old_size / sizeof(struct ext2_db_entry2);
152 new_entry = dblist->list + ( dblist->count++);
153 new_entry->blk = blk;
154 new_entry->ino = ino;
155 new_entry->blockcnt = blockcnt;
163 * Change the directory block to the directory block list
165 errcode_t ext2fs_set_dir_block2(ext2_dblist dblist, ext2_ino_t ino,
166 blk64_t blk, e2_blkcnt_t blockcnt)
170 EXT2_CHECK_MAGIC(dblist, EXT2_ET_MAGIC_DBLIST);
172 for (i=0; i < dblist->count; i++) {
173 if ((dblist->list[i].ino != ino) ||
174 (dblist->list[i].blockcnt != blockcnt))
176 dblist->list[i].blk = blk;
180 return EXT2_ET_DB_NOT_FOUND;
183 void ext2fs_dblist_sort2(ext2_dblist dblist,
184 EXT2_QSORT_TYPE (*sortfunc)(const void *,
188 sortfunc = dir_block_cmp2;
189 qsort(dblist->list, (size_t) dblist->count,
190 sizeof(struct ext2_db_entry2), sortfunc);
195 * This function iterates over the directory block list
197 errcode_t ext2fs_dblist_iterate3(ext2_dblist dblist,
198 int (*func)(ext2_filsys fs,
199 struct ext2_db_entry2 *db_info,
201 unsigned long long start,
202 unsigned long long count,
205 unsigned long long i, end;
208 EXT2_CHECK_MAGIC(dblist, EXT2_ET_MAGIC_DBLIST);
212 ext2fs_dblist_sort2(dblist, 0);
213 if (end > dblist->count)
215 for (i = start; i < end; i++) {
216 ret = (*func)(dblist->fs, &dblist->list[i], priv_data);
217 if (ret & DBLIST_ABORT)
223 errcode_t ext2fs_dblist_iterate2(ext2_dblist dblist,
224 int (*func)(ext2_filsys fs,
225 struct ext2_db_entry2 *db_info,
229 return ext2fs_dblist_iterate3(dblist, func, 0, dblist->count,
233 static EXT2_QSORT_TYPE dir_block_cmp2(const void *a, const void *b)
235 const struct ext2_db_entry2 *db_a =
236 (const struct ext2_db_entry2 *) a;
237 const struct ext2_db_entry2 *db_b =
238 (const struct ext2_db_entry2 *) b;
240 if (db_a->blk != db_b->blk)
241 return (int) (db_a->blk - db_b->blk);
243 if (db_a->ino != db_b->ino)
244 return (int) (db_a->ino - db_b->ino);
246 return (db_a->blockcnt - db_b->blockcnt);
249 blk64_t ext2fs_dblist_count2(ext2_dblist dblist)
251 return dblist->count;
254 errcode_t ext2fs_dblist_get_last2(ext2_dblist dblist,
255 struct ext2_db_entry2 **entry)
257 EXT2_CHECK_MAGIC(dblist, EXT2_ET_MAGIC_DBLIST);
259 if (dblist->count == 0)
260 return EXT2_ET_DBLIST_EMPTY;
263 *entry = dblist->list + ( dblist->count-1);
267 errcode_t ext2fs_dblist_drop_last(ext2_dblist dblist)
269 EXT2_CHECK_MAGIC(dblist, EXT2_ET_MAGIC_DBLIST);
271 if (dblist->count == 0)
272 return EXT2_ET_DBLIST_EMPTY;
279 * Legacy 32-bit versions
283 * Add a directory block to the directory block list
285 errcode_t ext2fs_add_dir_block(ext2_dblist dblist, ext2_ino_t ino, blk_t blk,
288 return ext2fs_add_dir_block2(dblist, ino, blk, blockcnt);
292 * Change the directory block to the directory block list
294 errcode_t ext2fs_set_dir_block(ext2_dblist dblist, ext2_ino_t ino, blk_t blk,
297 return ext2fs_set_dir_block2(dblist, ino, blk, blockcnt);
300 void ext2fs_dblist_sort(ext2_dblist dblist,
301 EXT2_QSORT_TYPE (*sortfunc)(const void *,
305 sortfunc32 = sortfunc;
306 sortfunc = dir_block_cmp;
308 sortfunc = dir_block_cmp2;
309 qsort(dblist->list, (size_t) dblist->count,
310 sizeof(struct ext2_db_entry2), sortfunc);
315 * This function iterates over the directory block list
317 struct iterate_passthrough {
318 int (*func)(ext2_filsys fs,
319 struct ext2_db_entry *db_info,
324 static int passthrough_func(ext2_filsys fs,
325 struct ext2_db_entry2 *db_info,
328 struct iterate_passthrough *p = priv_data;
329 struct ext2_db_entry db;
332 db.ino = db_info->ino;
333 db.blk = (blk_t) db_info->blk;
334 db.blockcnt = (int) db_info->blockcnt;
335 ret = (p->func)(fs, &db, p->priv_data);
336 db_info->ino = db.ino;
337 db_info->blk = db.blk;
338 db_info->blockcnt = db.blockcnt;
342 errcode_t ext2fs_dblist_iterate(ext2_dblist dblist,
343 int (*func)(ext2_filsys fs,
344 struct ext2_db_entry *db_info,
348 struct iterate_passthrough pass;
350 EXT2_CHECK_MAGIC(dblist, EXT2_ET_MAGIC_DBLIST);
352 pass.priv_data = priv_data;
354 return ext2fs_dblist_iterate2(dblist, passthrough_func, &pass);
357 static EXT2_QSORT_TYPE dir_block_cmp(const void *a, const void *b)
359 const struct ext2_db_entry2 *db_a =
360 (const struct ext2_db_entry2 *) a;
361 const struct ext2_db_entry2 *db_b =
362 (const struct ext2_db_entry2 *) b;
364 struct ext2_db_entry a32, b32;
366 a32.ino = db_a->ino; a32.blk = db_a->blk;
367 a32.blockcnt = db_a->blockcnt;
369 b32.ino = db_b->ino; b32.blk = db_b->blk;
370 b32.blockcnt = db_b->blockcnt;
372 return sortfunc32(&a32, &b32);
375 int ext2fs_dblist_count(ext2_dblist dblist)
377 return dblist->count;
380 errcode_t ext2fs_dblist_get_last(ext2_dblist dblist,
381 struct ext2_db_entry **entry)
383 static struct ext2_db_entry ret_entry;
384 struct ext2_db_entry2 *last;
386 EXT2_CHECK_MAGIC(dblist, EXT2_ET_MAGIC_DBLIST);
388 if (dblist->count == 0)
389 return EXT2_ET_DBLIST_EMPTY;
394 last = dblist->list + dblist->count -1;
396 ret_entry.ino = last->ino;
397 ret_entry.blk = last->blk;
398 ret_entry.blockcnt = last->blockcnt;