2 * dirinfo.c --- maintains the directory information table for e2fsck.
4 * Copyright (C) 1993 Theodore Ts'o. This file may be redistributed
5 * under the terms of the GNU Public License.
14 #include "uuid/uuid.h"
16 #include "ext2fs/ext2fs.h"
17 #include <ext2fs/tdb.h>
22 struct dir_info *array;
23 struct dir_info *last_lookup;
30 struct dir_info_iter {
38 ext2_ino_t dotdot; /* Parent according to '..' */
39 ext2_ino_t parent; /* Parent according to treewalk */
43 static void e2fsck_put_dir_info(e2fsck_t ctx, struct dir_info *dir);
46 static void setup_tdb(e2fsck_t ctx, ext2_ino_t num_dirs)
48 struct dir_info_db *db = ctx->dir_info;
49 unsigned int threshold;
52 char *tdb_dir, uuid[40];
55 profile_get_string(ctx->profile, "scratch_files", "directory", 0, 0,
57 profile_get_uint(ctx->profile, "scratch_files",
58 "numdirs_threshold", 0, 0, &threshold);
59 profile_get_boolean(ctx->profile, "scratch_files",
60 "dirinfo", 0, 1, &enable);
62 if (!enable || !tdb_dir || access(tdb_dir, W_OK) ||
63 (threshold && num_dirs <= threshold))
66 retval = ext2fs_get_mem(strlen(tdb_dir) + 64, &db->tdb_fn);
70 uuid_unparse(ctx->fs->super->s_uuid, uuid);
71 sprintf(db->tdb_fn, "%s/%s-dirinfo-XXXXXX", tdb_dir, uuid);
72 save_umask = umask(077);
73 fd = mkstemp(db->tdb_fn);
81 num_dirs = 99991; /* largest 5 digit prime */
83 db->tdb = tdb_open(db->tdb_fn, num_dirs, TDB_NOLOCK | TDB_NOSYNC,
84 O_RDWR | O_CREAT | O_TRUNC, 0600);
89 static void setup_db(e2fsck_t ctx)
91 struct dir_info_db *db;
95 db = (struct dir_info_db *)
96 e2fsck_allocate_memory(ctx, sizeof(struct dir_info_db),
98 db->count = db->size = 0;
103 retval = ext2fs_get_num_dirs(ctx->fs, &num_dirs);
105 num_dirs = 1024; /* Guess */
108 setup_tdb(ctx, num_dirs);
112 printf("Note: using tdb!\n");
118 db->size = num_dirs + 10;
119 db->array = (struct dir_info *)
120 e2fsck_allocate_memory(ctx, db->size
121 * sizeof (struct dir_info),
126 * This subroutine is called during pass1 to create a directory info
127 * entry. During pass1, the passed-in parent is 0; it will get filled
130 void e2fsck_add_dir_info(e2fsck_t ctx, ext2_ino_t ino, ext2_ino_t parent)
132 struct dir_info *dir, *old_array;
135 unsigned long old_size;
138 printf("add_dir_info for inode (%lu, %lu)...\n", ino, parent);
143 if (ctx->dir_info->count >= ctx->dir_info->size) {
144 old_size = ctx->dir_info->size * sizeof(struct dir_info);
145 ctx->dir_info->size += 10;
146 old_array = ctx->dir_info->array;
147 retval = ext2fs_resize_mem(old_size, ctx->dir_info->size *
148 sizeof(struct dir_info),
149 &ctx->dir_info->array);
151 fprintf(stderr, "Couldn't reallocate dir_info "
152 "structure to %d entries\n",
153 ctx->dir_info->size);
155 ctx->dir_info->size -= 10;
158 if (old_array != ctx->dir_info->array)
159 ctx->dir_info->last_lookup = NULL;
163 if (ctx->dir_info->tdb) {
169 e2fsck_put_dir_info(ctx, &ent);
175 * Normally, add_dir_info is called with each inode in
176 * sequential order; but once in a while (like when pass 3
177 * needs to recreate the root directory or lost+found
178 * directory) it is called out of order. In those cases, we
179 * need to move the dir_info entries down to make room, since
180 * the dir_info array needs to be sorted by inode number for
181 * get_dir_info()'s sake.
183 if (ctx->dir_info->count &&
184 ctx->dir_info->array[ctx->dir_info->count-1].ino >= ino) {
185 for (i = ctx->dir_info->count-1; i > 0; i--)
186 if (ctx->dir_info->array[i-1].ino < ino)
188 dir = &ctx->dir_info->array[i];
190 for (j = ctx->dir_info->count++; j > i; j--)
191 ctx->dir_info->array[j] = ctx->dir_info->array[j-1];
193 dir = &ctx->dir_info->array[ctx->dir_info->count++];
196 dir->dotdot = parent;
197 dir->parent = parent;
201 * get_dir_info() --- given an inode number, try to find the directory
202 * information entry for it.
204 static struct dir_info *e2fsck_get_dir_info(e2fsck_t ctx, ext2_ino_t ino)
206 struct dir_info_db *db = ctx->dir_info;
213 printf("e2fsck_get_dir_info %d...", ino);
218 static struct dir_info ret_dir_info;
220 struct dir_info_ent *buf;
222 key.dptr = (unsigned char *) &ino;
223 key.dsize = sizeof(ext2_ino_t);
225 data = tdb_fetch(db->tdb, key);
227 if (tdb_error(db->tdb) != TDB_ERR_NOEXIST)
228 printf("fetch failed: %s\n",
229 tdb_errorstr(db->tdb));
233 buf = (struct dir_info_ent *) data.dptr;
234 ret_dir_info.ino = ino;
235 ret_dir_info.dotdot = buf->dotdot;
236 ret_dir_info.parent = buf->parent;
238 printf("(%d,%d,%d)\n", ino, buf->dotdot, buf->parent);
241 return &ret_dir_info;
245 if (db->last_lookup && db->last_lookup->ino == ino)
246 return db->last_lookup;
249 high = ctx->dir_info->count-1;
250 if (ino == ctx->dir_info->array[low].ino) {
252 printf("(%d,%d,%d)\n", ino,
253 ctx->dir_info->array[low].dotdot,
254 ctx->dir_info->array[low].parent);
256 return &ctx->dir_info->array[low];
258 if (ino == ctx->dir_info->array[high].ino) {
260 printf("(%d,%d,%d)\n", ino,
261 ctx->dir_info->array[high].dotdot,
262 ctx->dir_info->array[high].parent);
264 return &ctx->dir_info->array[high];
269 if (mid == low || mid == high)
271 if (ino == ctx->dir_info->array[mid].ino) {
273 printf("(%d,%d,%d)\n", ino,
274 ctx->dir_info->array[mid].dotdot,
275 ctx->dir_info->array[mid].parent);
277 return &ctx->dir_info->array[mid];
279 if (ino < ctx->dir_info->array[mid].ino)
287 static void e2fsck_put_dir_info(e2fsck_t ctx EXT2FS_NO_TDB_UNUSED,
288 struct dir_info *dir EXT2FS_NO_TDB_UNUSED)
291 struct dir_info_db *db = ctx->dir_info;
292 struct dir_info_ent buf;
297 printf("e2fsck_put_dir_info (%d, %d, %d)...", dir->ino, dir->dotdot,
305 buf.parent = dir->parent;
306 buf.dotdot = dir->dotdot;
308 key.dptr = (unsigned char *) &dir->ino;
309 key.dsize = sizeof(ext2_ino_t);
310 data.dptr = (unsigned char *) &buf;
311 data.dsize = sizeof(buf);
313 if (tdb_store(db->tdb, key, data, TDB_REPLACE) == -1) {
314 printf("store failed: %s\n", tdb_errorstr(db->tdb));
320 * Free the dir_info structure when it isn't needed any more.
322 void e2fsck_free_dir_info(e2fsck_t ctx)
326 if (ctx->dir_info->tdb)
327 tdb_close(ctx->dir_info->tdb);
328 if (ctx->dir_info->tdb_fn) {
329 unlink(ctx->dir_info->tdb_fn);
330 free(ctx->dir_info->tdb_fn);
333 if (ctx->dir_info->array)
334 ext2fs_free_mem(&ctx->dir_info->array);
335 ctx->dir_info->array = 0;
336 ctx->dir_info->size = 0;
337 ctx->dir_info->count = 0;
338 ext2fs_free_mem(&ctx->dir_info);
344 * Return the count of number of directories in the dir_info structure
346 int e2fsck_get_num_dirinfo(e2fsck_t ctx)
348 return ctx->dir_info ? ctx->dir_info->count : 0;
351 struct dir_info_iter *e2fsck_dir_info_iter_begin(e2fsck_t ctx)
353 struct dir_info_iter *iter;
355 iter = e2fsck_allocate_memory(ctx, sizeof(struct dir_info_iter),
356 "dir_info iterator");
359 if (ctx->dir_info->tdb)
360 iter->tdb_iter = tdb_firstkey(ctx->dir_info->tdb);
366 void e2fsck_dir_info_iter_end(e2fsck_t ctx EXT2FS_ATTR((unused)),
367 struct dir_info_iter *iter)
370 free(iter->tdb_iter.dptr);
372 ext2fs_free_mem(&iter);
376 * A simple interator function
378 struct dir_info *e2fsck_dir_info_iter(e2fsck_t ctx, struct dir_info_iter *iter)
380 if (!ctx->dir_info || !iter)
384 if (ctx->dir_info->tdb) {
385 static struct dir_info ret_dir_info;
386 struct dir_info_ent *buf;
389 if (iter->tdb_iter.dptr == 0)
391 key = iter->tdb_iter;
392 data = tdb_fetch(ctx->dir_info->tdb, key);
394 printf("iter fetch failed: %s\n",
395 tdb_errorstr(ctx->dir_info->tdb));
398 buf = (struct dir_info_ent *) data.dptr;
399 ret_dir_info.ino = *((ext2_ino_t *) iter->tdb_iter.dptr);
400 ret_dir_info.dotdot = buf->dotdot;
401 ret_dir_info.parent = buf->parent;
402 iter->tdb_iter = tdb_nextkey(ctx->dir_info->tdb, key);
405 return &ret_dir_info;
409 if (iter->i >= ctx->dir_info->count)
413 printf("iter(%d, %d, %d)...", ctx->dir_info->array[iter->i].ino,
414 ctx->dir_info->array[iter->i].dotdot,
415 ctx->dir_info->array[iter->i].parent);
417 ctx->dir_info->last_lookup = ctx->dir_info->array + iter->i++;
418 return(ctx->dir_info->last_lookup);
422 * This function only sets the parent pointer, and requires that
423 * dirinfo structure has already been created.
425 int e2fsck_dir_info_set_parent(e2fsck_t ctx, ext2_ino_t ino,
430 p = e2fsck_get_dir_info(ctx, ino);
434 e2fsck_put_dir_info(ctx, p);
439 * This function only sets the dot dot pointer, and requires that
440 * dirinfo structure has already been created.
442 int e2fsck_dir_info_set_dotdot(e2fsck_t ctx, ext2_ino_t ino,
447 p = e2fsck_get_dir_info(ctx, ino);
451 e2fsck_put_dir_info(ctx, p);
456 * This function only sets the parent pointer, and requires that
457 * dirinfo structure has already been created.
459 int e2fsck_dir_info_get_parent(e2fsck_t ctx, ext2_ino_t ino,
464 p = e2fsck_get_dir_info(ctx, ino);
472 * This function only sets the dot dot pointer, and requires that
473 * dirinfo structure has already been created.
475 int e2fsck_dir_info_get_dotdot(e2fsck_t ctx, ext2_ino_t ino,
480 p = e2fsck_get_dir_info(ctx, ino);