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/tdb.h>
21 struct dir_info *array;
22 struct dir_info *last_lookup;
27 struct dir_info_iter {
33 ext2_ino_t dotdot; /* Parent according to '..' */
34 ext2_ino_t parent; /* Parent according to treewalk */
38 static void e2fsck_put_dir_info(e2fsck_t ctx, struct dir_info *dir);
40 static void setup_tdb(e2fsck_t ctx, ext2_ino_t num_dirs)
42 struct dir_info_db *db = ctx->dir_info;
43 unsigned int threshold;
45 char *tdb_dir, uuid[40];
48 profile_get_string(ctx->profile, "scratch_files", "directory", 0, 0,
50 profile_get_uint(ctx->profile, "scratch_files",
51 "numdirs_threshold", 0, 0, &threshold);
52 profile_get_boolean(ctx->profile, "scratch_files",
53 "dirinfo", 0, 1, &enable);
55 if (!enable || !tdb_dir || access(tdb_dir, W_OK) ||
56 (threshold && num_dirs <= threshold))
59 retval = ext2fs_get_mem(strlen(tdb_dir) + 64, &db->tdb_fn);
63 uuid_unparse(ctx->fs->super->s_uuid, uuid);
64 sprintf(db->tdb_fn, "%s/%s-dirinfo-XXXXXX", tdb_dir, uuid);
65 fd = mkstemp(db->tdb_fn);
72 num_dirs = 99991; /* largest 5 digit prime */
74 db->tdb = tdb_open(db->tdb_fn, num_dirs, TDB_NOLOCK | TDB_NOSYNC,
75 O_RDWR | O_CREAT | O_TRUNC, 0600);
79 static void setup_db(e2fsck_t ctx)
81 struct dir_info_db *db;
85 db = (struct dir_info_db *)
86 e2fsck_allocate_memory(ctx, sizeof(struct dir_info_db),
88 db->count = db->size = 0;
93 retval = ext2fs_get_num_dirs(ctx->fs, &num_dirs);
95 num_dirs = 1024; /* Guess */
97 setup_tdb(ctx, num_dirs);
101 printf("Note: using tdb!\n");
106 db->size = num_dirs + 10;
107 db->array = (struct dir_info *)
108 e2fsck_allocate_memory(ctx, db->size
109 * sizeof (struct dir_info),
114 * This subroutine is called during pass1 to create a directory info
115 * entry. During pass1, the passed-in parent is 0; it will get filled
118 void e2fsck_add_dir_info(e2fsck_t ctx, ext2_ino_t ino, ext2_ino_t parent)
120 struct dir_info_db *db;
121 struct dir_info *dir, ent;
124 unsigned long old_size;
127 printf("add_dir_info for inode (%lu, %lu)...\n", ino, parent);
133 if (ctx->dir_info->count >= ctx->dir_info->size) {
134 old_size = ctx->dir_info->size * sizeof(struct dir_info);
135 ctx->dir_info->size += 10;
136 retval = ext2fs_resize_mem(old_size, ctx->dir_info->size *
137 sizeof(struct dir_info),
138 &ctx->dir_info->array);
140 ctx->dir_info->size -= 10;
150 e2fsck_put_dir_info(ctx, &ent);
155 * Normally, add_dir_info is called with each inode in
156 * sequential order; but once in a while (like when pass 3
157 * needs to recreate the root directory or lost+found
158 * directory) it is called out of order. In those cases, we
159 * need to move the dir_info entries down to make room, since
160 * the dir_info array needs to be sorted by inode number for
161 * get_dir_info()'s sake.
163 if (ctx->dir_info->count &&
164 ctx->dir_info->array[ctx->dir_info->count-1].ino >= ino) {
165 for (i = ctx->dir_info->count-1; i > 0; i--)
166 if (ctx->dir_info->array[i-1].ino < ino)
168 dir = &ctx->dir_info->array[i];
170 for (j = ctx->dir_info->count++; j > i; j--)
171 ctx->dir_info->array[j] = ctx->dir_info->array[j-1];
173 dir = &ctx->dir_info->array[ctx->dir_info->count++];
176 dir->dotdot = parent;
177 dir->parent = parent;
181 * get_dir_info() --- given an inode number, try to find the directory
182 * information entry for it.
184 static struct dir_info *e2fsck_get_dir_info(e2fsck_t ctx, ext2_ino_t ino)
186 struct dir_info_db *db = ctx->dir_info;
188 struct dir_info_ent *buf;
189 static struct dir_info ret_dir_info;
195 printf("e2fsck_get_dir_info %d...", ino);
201 key.dptr = (unsigned char *) &ino;
202 key.dsize = sizeof(ext2_ino_t);
204 data = tdb_fetch(db->tdb, key);
206 if (tdb_error(db->tdb) != TDB_ERR_NOEXIST)
207 printf("fetch failed: %s\n",
208 tdb_errorstr(db->tdb));
212 buf = (struct dir_info_ent *) data.dptr;
213 ret_dir_info.ino = ino;
214 ret_dir_info.dotdot = buf->dotdot;
215 ret_dir_info.parent = buf->parent;
217 printf("(%d,%d,%d)\n", ino, buf->dotdot, buf->parent);
220 return &ret_dir_info;
223 if (db->last_lookup && db->last_lookup->ino == ino)
224 return db->last_lookup;
227 high = ctx->dir_info->count-1;
228 if (ino == ctx->dir_info->array[low].ino) {
230 printf("(%d,%d,%d)\n", ino,
231 ctx->dir_info->array[low].dotdot,
232 ctx->dir_info->array[low].parent);
234 return &ctx->dir_info->array[low];
236 if (ino == ctx->dir_info->array[high].ino) {
238 printf("(%d,%d,%d)\n", ino,
239 ctx->dir_info->array[high].dotdot,
240 ctx->dir_info->array[high].parent);
242 return &ctx->dir_info->array[high];
247 if (mid == low || mid == high)
249 if (ino == ctx->dir_info->array[mid].ino) {
251 printf("(%d,%d,%d)\n", ino,
252 ctx->dir_info->array[mid].dotdot,
253 ctx->dir_info->array[mid].parent);
255 return &ctx->dir_info->array[mid];
257 if (ino < ctx->dir_info->array[mid].ino)
265 static void e2fsck_put_dir_info(e2fsck_t ctx, struct dir_info *dir)
267 struct dir_info_db *db = ctx->dir_info;
268 struct dir_info_ent buf;
272 printf("e2fsck_put_dir_info (%d, %d, %d)...", dir->ino, dir->dotdot,
279 buf.parent = dir->parent;
280 buf.dotdot = dir->dotdot;
282 key.dptr = (unsigned char *) &dir->ino;
283 key.dsize = sizeof(ext2_ino_t);
284 data.dptr = (unsigned char *) &buf;
285 data.dsize = sizeof(buf);
287 if (tdb_store(db->tdb, key, data, TDB_REPLACE) == -1) {
288 printf("store failed: %s\n", tdb_errorstr(db->tdb));
294 * Free the dir_info structure when it isn't needed any more.
296 void e2fsck_free_dir_info(e2fsck_t ctx)
299 if (ctx->dir_info->tdb)
300 tdb_close(ctx->dir_info->tdb);
301 if (ctx->dir_info->tdb_fn) {
302 unlink(ctx->dir_info->tdb_fn);
303 free(ctx->dir_info->tdb_fn);
305 if (ctx->dir_info->array)
306 ext2fs_free_mem(&ctx->dir_info->array);
307 ctx->dir_info->array = 0;
308 ctx->dir_info->size = 0;
309 ctx->dir_info->count = 0;
310 ext2fs_free_mem(&ctx->dir_info);
316 * Return the count of number of directories in the dir_info structure
318 int e2fsck_get_num_dirinfo(e2fsck_t ctx)
320 return ctx->dir_info ? ctx->dir_info->count : 0;
323 extern struct dir_info_iter *e2fsck_dir_info_iter_begin(e2fsck_t ctx)
325 struct dir_info_iter *iter;
326 struct dir_info_db *db = ctx->dir_info;
328 iter = e2fsck_allocate_memory(ctx, sizeof(struct dir_info_iter),
329 "dir_info iterator");
332 iter->tdb_iter = tdb_firstkey(db->tdb);
337 extern void e2fsck_dir_info_iter_end(e2fsck_t ctx EXT2FS_ATTR((unused)),
338 struct dir_info_iter *iter)
340 free(iter->tdb_iter.dptr);
341 ext2fs_free_mem(&iter);
345 * A simple interator function
347 struct dir_info *e2fsck_dir_info_iter(e2fsck_t ctx, struct dir_info_iter *iter)
350 struct dir_info_db *db = ctx->dir_info;
351 struct dir_info_ent *buf;
352 static struct dir_info ret_dir_info;
354 if (!ctx->dir_info || !iter)
358 if (iter->tdb_iter.dptr == 0)
360 key = iter->tdb_iter;
361 data = tdb_fetch(db->tdb, key);
363 printf("iter fetch failed: %s\n",
364 tdb_errorstr(db->tdb));
367 buf = (struct dir_info_ent *) data.dptr;
368 ret_dir_info.ino = *((ext2_ino_t *) iter->tdb_iter.dptr);
369 ret_dir_info.dotdot = buf->dotdot;
370 ret_dir_info.parent = buf->parent;
371 iter->tdb_iter = tdb_nextkey(db->tdb, key);
374 return &ret_dir_info;
377 if (iter->i >= ctx->dir_info->count)
381 printf("iter(%d, %d, %d)...", ctx->dir_info->array[iter->i].ino,
382 ctx->dir_info->array[iter->i].dotdot,
383 ctx->dir_info->array[iter->i].parent);
385 ctx->dir_info->last_lookup = ctx->dir_info->array + iter->i++;
386 return(ctx->dir_info->last_lookup);
390 * This function only sets the parent pointer, and requires that
391 * dirinfo structure has already been created.
393 int e2fsck_dir_info_set_parent(e2fsck_t ctx, ext2_ino_t ino,
398 p = e2fsck_get_dir_info(ctx, ino);
402 e2fsck_put_dir_info(ctx, p);
407 * This function only sets the dot dot pointer, and requires that
408 * dirinfo structure has already been created.
410 int e2fsck_dir_info_set_dotdot(e2fsck_t ctx, ext2_ino_t ino,
415 p = e2fsck_get_dir_info(ctx, ino);
419 e2fsck_put_dir_info(ctx, p);
424 * This function only sets the parent pointer, and requires that
425 * dirinfo structure has already been created.
427 int e2fsck_dir_info_get_parent(e2fsck_t ctx, ext2_ino_t ino,
432 p = e2fsck_get_dir_info(ctx, ino);
440 * This function only sets the dot dot pointer, and requires that
441 * dirinfo structure has already been created.
443 int e2fsck_dir_info_get_dotdot(e2fsck_t ctx, ext2_ino_t ino,
448 p = e2fsck_get_dir_info(ctx, ino);