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Commit | Line | Data |
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3839e657 TT |
1 | /* |
2 | * pass3.c -- pass #3 of e2fsck: Check for directory connectivity | |
3 | * | |
c1faf9cc | 4 | * Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999 Theodore Ts'o. |
21c84b71 TT |
5 | * |
6 | * %Begin-Header% | |
7 | * This file may be redistributed under the terms of the GNU Public | |
8 | * License. | |
9 | * %End-Header% | |
3839e657 TT |
10 | * |
11 | * Pass #3 assures that all directories are connected to the | |
12 | * filesystem tree, using the following algorithm: | |
13 | * | |
14 | * First, the root directory is checked to make sure it exists; if | |
15 | * not, e2fsck will offer to create a new one. It is then marked as | |
16 | * "done". | |
17 | * | |
18 | * Then, pass3 interates over all directory inodes; for each directory | |
19 | * it attempts to trace up the filesystem tree, using dirinfo.parent | |
20 | * until it reaches a directory which has been marked "done". If it | |
21 | * can not do so, then the directory must be disconnected, and e2fsck | |
22 | * will offer to reconnect it to /lost+found. While it is chasing | |
23 | * parent pointers up the filesystem tree, if pass3 sees a directory | |
24 | * twice, then it has detected a filesystem loop, and it will again | |
25 | * offer to reconnect the directory to /lost+found in to break the | |
26 | * filesystem loop. | |
27 | * | |
08b21301 TT |
28 | * Pass 3 also contains the subroutine, e2fsck_reconnect_file() to |
29 | * reconnect inodes to /lost+found; this subroutine is also used by | |
30 | * pass 4. e2fsck_reconnect_file() calls get_lost_and_found(), which | |
31 | * is responsible for creating /lost+found if it does not exist. | |
3839e657 TT |
32 | * |
33 | * Pass 3 frees the following data structures: | |
34 | * - The dirinfo directory information cache. | |
35 | */ | |
36 | ||
50e1e10f TT |
37 | #ifdef HAVE_ERRNO_H |
38 | #include <errno.h> | |
39 | #endif | |
3839e657 TT |
40 | |
41 | #include "e2fsck.h" | |
21c84b71 | 42 | #include "problem.h" |
3839e657 | 43 | |
1b6bf175 | 44 | static void check_root(e2fsck_t ctx); |
28ffafb0 TT |
45 | static int check_directory(e2fsck_t ctx, struct dir_info *dir, |
46 | struct problem_context *pctx); | |
86c627ec TT |
47 | static ext2_ino_t get_lost_and_found(e2fsck_t ctx); |
48 | static void fix_dotdot(e2fsck_t ctx, struct dir_info *dir, ext2_ino_t parent); | |
49 | static errcode_t adjust_inode_count(e2fsck_t ctx, ext2_ino_t ino, int adj); | |
3839e657 | 50 | |
86c627ec | 51 | static ext2_ino_t lost_and_found = 0; |
3839e657 TT |
52 | static int bad_lost_and_found = 0; |
53 | ||
a02ce9df TT |
54 | static ext2fs_inode_bitmap inode_loop_detect = 0; |
55 | static ext2fs_inode_bitmap inode_done_map = 0; | |
3839e657 | 56 | |
08b21301 | 57 | void e2fsck_pass3(e2fsck_t ctx) |
3839e657 | 58 | { |
1b6bf175 | 59 | ext2_filsys fs = ctx->fs; |
3839e657 | 60 | int i; |
8bf191e8 | 61 | #ifdef RESOURCE_TRACK |
3839e657 | 62 | struct resource_track rtrack; |
8bf191e8 | 63 | #endif |
21c84b71 TT |
64 | struct problem_context pctx; |
65 | struct dir_info *dir; | |
7f813ba3 | 66 | unsigned long maxdirs, count; |
f8188fff | 67 | |
8bf191e8 | 68 | #ifdef RESOURCE_TRACK |
3839e657 | 69 | init_resource_track(&rtrack); |
8bf191e8 | 70 | #endif |
3839e657 | 71 | |
1b6bf175 TT |
72 | clear_problem_context(&pctx); |
73 | ||
3839e657 TT |
74 | #ifdef MTRACE |
75 | mtrace_print("Pass 3"); | |
76 | #endif | |
77 | ||
1b6bf175 TT |
78 | if (!(ctx->options & E2F_OPT_PREEN)) |
79 | fix_problem(ctx, PR_3_PASS_HEADER, &pctx); | |
3839e657 TT |
80 | |
81 | /* | |
82 | * Allocate some bitmaps to do loop detection. | |
83 | */ | |
0c4a0726 | 84 | pctx.errcode = ext2fs_allocate_inode_bitmap(fs, _("inode done bitmap"), |
1b6bf175 TT |
85 | &inode_done_map); |
86 | if (pctx.errcode) { | |
87 | pctx.num = 2; | |
88 | fix_problem(ctx, PR_3_ALLOCATE_IBITMAP_ERROR, &pctx); | |
08b21301 | 89 | ctx->flags |= E2F_FLAG_ABORT; |
a02ce9df | 90 | goto abort_exit; |
3839e657 | 91 | } |
8bf191e8 | 92 | #ifdef RESOURCE_TRACK |
5596defa TT |
93 | if (ctx->options & E2F_OPT_TIME) { |
94 | e2fsck_clear_progbar(ctx); | |
0c4a0726 | 95 | print_resource_track(_("Peak memory"), &ctx->global_rtrack); |
5596defa | 96 | } |
8bf191e8 | 97 | #endif |
3839e657 | 98 | |
1b6bf175 | 99 | check_root(ctx); |
a02ce9df TT |
100 | if (ctx->flags & E2F_FLAG_SIGNAL_MASK) |
101 | goto abort_exit; | |
08b21301 | 102 | |
f3db3566 | 103 | ext2fs_mark_inode_bitmap(inode_done_map, EXT2_ROOT_INO); |
3839e657 | 104 | |
7f813ba3 | 105 | maxdirs = e2fsck_get_num_dirinfo(ctx); |
f75c28de | 106 | count = 1; |
f8188fff | 107 | |
f75c28de | 108 | if (ctx->progress) |
7f813ba3 | 109 | if ((ctx->progress)(ctx, 3, 0, maxdirs)) |
f75c28de TT |
110 | goto abort_exit; |
111 | ||
08b21301 | 112 | for (i=0; (dir = e2fsck_dir_info_iter(ctx, &i)) != 0;) { |
4cae0452 TT |
113 | if (ctx->flags & E2F_FLAG_SIGNAL_MASK) |
114 | goto abort_exit; | |
115 | if (ctx->progress && (ctx->progress)(ctx, 3, count++, maxdirs)) | |
116 | goto abort_exit; | |
1b6bf175 | 117 | if (ext2fs_test_inode_bitmap(ctx->inode_dir_map, dir->ino)) |
28ffafb0 TT |
118 | if (check_directory(ctx, dir, &pctx)) |
119 | goto abort_exit; | |
3839e657 | 120 | } |
a02ce9df | 121 | |
5a679c8f TT |
122 | /* |
123 | * Force the creation of /lost+found if not present | |
124 | */ | |
125 | if ((ctx->flags & E2F_OPT_READONLY) == 0) | |
126 | get_lost_and_found(ctx); | |
127 | ||
a02ce9df | 128 | abort_exit: |
08b21301 | 129 | e2fsck_free_dir_info(ctx); |
28ffafb0 | 130 | if (inode_loop_detect) { |
a02ce9df | 131 | ext2fs_free_inode_bitmap(inode_loop_detect); |
28ffafb0 TT |
132 | inode_loop_detect = 0; |
133 | } | |
134 | if (inode_done_map) { | |
a02ce9df | 135 | ext2fs_free_inode_bitmap(inode_done_map); |
28ffafb0 TT |
136 | inode_done_map = 0; |
137 | } | |
b7a00563 TT |
138 | |
139 | /* If there are any directories that need to be indexed, do it here. */ | |
140 | if (ctx->dirs_to_hash) | |
141 | e2fsck_rehash_directories(ctx); | |
142 | ||
8bf191e8 | 143 | #ifdef RESOURCE_TRACK |
5596defa TT |
144 | if (ctx->options & E2F_OPT_TIME2) { |
145 | e2fsck_clear_progbar(ctx); | |
0c4a0726 | 146 | print_resource_track(_("Pass 3"), &rtrack); |
5596defa | 147 | } |
8bf191e8 | 148 | #endif |
3839e657 TT |
149 | } |
150 | ||
151 | /* | |
152 | * This makes sure the root inode is present; if not, we ask if the | |
153 | * user wants us to create it. Not creating it is a fatal error. | |
154 | */ | |
1b6bf175 | 155 | static void check_root(e2fsck_t ctx) |
3839e657 | 156 | { |
1b6bf175 | 157 | ext2_filsys fs = ctx->fs; |
3839e657 | 158 | blk_t blk; |
3839e657 TT |
159 | struct ext2_inode inode; |
160 | char * block; | |
1b6bf175 | 161 | struct problem_context pctx; |
3839e657 | 162 | |
1b6bf175 TT |
163 | clear_problem_context(&pctx); |
164 | ||
165 | if (ext2fs_test_inode_bitmap(ctx->inode_used_map, EXT2_ROOT_INO)) { | |
3839e657 | 166 | /* |
08b21301 | 167 | * If the root inode is not a directory, die here. The |
3839e657 TT |
168 | * user must have answered 'no' in pass1 when we |
169 | * offered to clear it. | |
170 | */ | |
1b6bf175 | 171 | if (!(ext2fs_test_inode_bitmap(ctx->inode_dir_map, |
f8188fff TT |
172 | EXT2_ROOT_INO))) { |
173 | fix_problem(ctx, PR_3_ROOT_NOT_DIR_ABORT, &pctx); | |
174 | ctx->flags |= E2F_FLAG_ABORT; | |
175 | } | |
3839e657 TT |
176 | return; |
177 | } | |
178 | ||
f8188fff TT |
179 | if (!fix_problem(ctx, PR_3_NO_ROOT_INODE, &pctx)) { |
180 | fix_problem(ctx, PR_3_NO_ROOT_INODE_ABORT, &pctx); | |
181 | ctx->flags |= E2F_FLAG_ABORT; | |
182 | return; | |
183 | } | |
3839e657 | 184 | |
f8188fff | 185 | e2fsck_read_bitmaps(ctx); |
3839e657 TT |
186 | |
187 | /* | |
188 | * First, find a free block | |
189 | */ | |
1b6bf175 TT |
190 | pctx.errcode = ext2fs_new_block(fs, 0, ctx->block_found_map, &blk); |
191 | if (pctx.errcode) { | |
192 | pctx.str = "ext2fs_new_block"; | |
193 | fix_problem(ctx, PR_3_CREATE_ROOT_ERROR, &pctx); | |
08b21301 TT |
194 | ctx->flags |= E2F_FLAG_ABORT; |
195 | return; | |
3839e657 | 196 | } |
1b6bf175 | 197 | ext2fs_mark_block_bitmap(ctx->block_found_map, blk); |
f3db3566 | 198 | ext2fs_mark_block_bitmap(fs->block_map, blk); |
3839e657 TT |
199 | ext2fs_mark_bb_dirty(fs); |
200 | ||
201 | /* | |
202 | * Now let's create the actual data block for the inode | |
203 | */ | |
1b6bf175 TT |
204 | pctx.errcode = ext2fs_new_dir_block(fs, EXT2_ROOT_INO, EXT2_ROOT_INO, |
205 | &block); | |
206 | if (pctx.errcode) { | |
207 | pctx.str = "ext2fs_new_dir_block"; | |
208 | fix_problem(ctx, PR_3_CREATE_ROOT_ERROR, &pctx); | |
08b21301 TT |
209 | ctx->flags |= E2F_FLAG_ABORT; |
210 | return; | |
3839e657 TT |
211 | } |
212 | ||
1b6bf175 TT |
213 | pctx.errcode = ext2fs_write_dir_block(fs, blk, block); |
214 | if (pctx.errcode) { | |
215 | pctx.str = "ext2fs_write_dir_block"; | |
216 | fix_problem(ctx, PR_3_CREATE_ROOT_ERROR, &pctx); | |
08b21301 TT |
217 | ctx->flags |= E2F_FLAG_ABORT; |
218 | return; | |
3839e657 | 219 | } |
08b21301 | 220 | ext2fs_free_mem((void **) &block); |
3839e657 TT |
221 | |
222 | /* | |
223 | * Set up the inode structure | |
224 | */ | |
225 | memset(&inode, 0, sizeof(inode)); | |
226 | inode.i_mode = 040755; | |
227 | inode.i_size = fs->blocksize; | |
228 | inode.i_atime = inode.i_ctime = inode.i_mtime = time(0); | |
229 | inode.i_links_count = 2; | |
230 | inode.i_blocks = fs->blocksize / 512; | |
231 | inode.i_block[0] = blk; | |
232 | ||
233 | /* | |
234 | * Write out the inode. | |
235 | */ | |
1b6bf175 TT |
236 | pctx.errcode = ext2fs_write_inode(fs, EXT2_ROOT_INO, &inode); |
237 | if (pctx.errcode) { | |
238 | pctx.str = "ext2fs_write_inode"; | |
239 | fix_problem(ctx, PR_3_CREATE_ROOT_ERROR, &pctx); | |
08b21301 TT |
240 | ctx->flags |= E2F_FLAG_ABORT; |
241 | return; | |
3839e657 TT |
242 | } |
243 | ||
244 | /* | |
245 | * Miscellaneous bookkeeping... | |
246 | */ | |
08b21301 | 247 | e2fsck_add_dir_info(ctx, EXT2_ROOT_INO, EXT2_ROOT_INO); |
1b6bf175 TT |
248 | ext2fs_icount_store(ctx->inode_count, EXT2_ROOT_INO, 2); |
249 | ext2fs_icount_store(ctx->inode_link_info, EXT2_ROOT_INO, 2); | |
3839e657 | 250 | |
1b6bf175 TT |
251 | ext2fs_mark_inode_bitmap(ctx->inode_used_map, EXT2_ROOT_INO); |
252 | ext2fs_mark_inode_bitmap(ctx->inode_dir_map, EXT2_ROOT_INO); | |
f3db3566 | 253 | ext2fs_mark_inode_bitmap(fs->inode_map, EXT2_ROOT_INO); |
3839e657 TT |
254 | ext2fs_mark_ib_dirty(fs); |
255 | } | |
256 | ||
257 | /* | |
258 | * This subroutine is responsible for making sure that a particular | |
259 | * directory is connected to the root; if it isn't we trace it up as | |
260 | * far as we can go, and then offer to connect the resulting parent to | |
261 | * the lost+found. We have to do loop detection; if we ever discover | |
262 | * a loop, we treat that as a disconnected directory and offer to | |
263 | * reparent it to lost+found. | |
28ffafb0 TT |
264 | * |
265 | * However, loop detection is expensive, because for very large | |
266 | * filesystems, the inode_loop_detect bitmap is huge, and clearing it | |
267 | * is non-trivial. Loops in filesystems are also a rare error case, | |
268 | * and we shouldn't optimize for error cases. So we try two passes of | |
269 | * the algorithm. The first time, we ignore loop detection and merely | |
270 | * increment a counter; if the counter exceeds some extreme threshold, | |
271 | * then we try again with the loop detection bitmap enabled. | |
3839e657 | 272 | */ |
28ffafb0 TT |
273 | static int check_directory(e2fsck_t ctx, struct dir_info *dir, |
274 | struct problem_context *pctx) | |
3839e657 | 275 | { |
28ffafb0 | 276 | ext2_filsys fs = ctx->fs; |
21c84b71 | 277 | struct dir_info *p = dir; |
28ffafb0 | 278 | int loop_pass = 0, parent_count = 0; |
3839e657 | 279 | |
7f813ba3 | 280 | if (!p) |
28ffafb0 | 281 | return 0; |
7f813ba3 | 282 | |
28ffafb0 | 283 | while (1) { |
3839e657 TT |
284 | /* |
285 | * Mark this inode as being "done"; by the time we | |
286 | * return from this function, the inode we either be | |
287 | * verified as being connected to the directory tree, | |
288 | * or we will have offered to reconnect this to | |
289 | * lost+found. | |
28ffafb0 TT |
290 | * |
291 | * If it was marked done already, then we've reached a | |
292 | * parent we've already checked. | |
3839e657 | 293 | */ |
28ffafb0 TT |
294 | if (ext2fs_mark_inode_bitmap(inode_done_map, p->ino)) |
295 | break; | |
7f813ba3 | 296 | |
3839e657 TT |
297 | /* |
298 | * If this directory doesn't have a parent, or we've | |
299 | * seen the parent once already, then offer to | |
300 | * reparent it to lost+found | |
301 | */ | |
302 | if (!p->parent || | |
28ffafb0 TT |
303 | (loop_pass && |
304 | (ext2fs_test_inode_bitmap(inode_loop_detect, | |
305 | p->parent)))) { | |
7f813ba3 TT |
306 | pctx->ino = p->ino; |
307 | if (fix_problem(ctx, PR_3_UNCONNECTED_DIR, pctx)) { | |
308 | if (e2fsck_reconnect_file(ctx, p->ino)) | |
309 | ext2fs_unmark_valid(fs); | |
310 | else { | |
311 | p->parent = lost_and_found; | |
312 | fix_dotdot(ctx, p, lost_and_found); | |
313 | } | |
314 | } | |
3839e657 | 315 | break; |
7f813ba3 | 316 | } |
08b21301 | 317 | p = e2fsck_get_dir_info(ctx, p->parent); |
7f813ba3 TT |
318 | if (!p) { |
319 | fix_problem(ctx, PR_3_NO_DIRINFO, pctx); | |
28ffafb0 TT |
320 | return 0; |
321 | } | |
322 | if (loop_pass) { | |
323 | ext2fs_mark_inode_bitmap(inode_loop_detect, | |
324 | p->ino); | |
325 | } else if (parent_count++ > 2048) { | |
326 | /* | |
327 | * If we've run into a path depth that's | |
328 | * greater than 2048, try again with the inode | |
329 | * loop bitmap turned on and start from the | |
330 | * top. | |
331 | */ | |
332 | loop_pass = 1; | |
333 | if (inode_loop_detect) | |
334 | ext2fs_clear_inode_bitmap(inode_loop_detect); | |
335 | else { | |
336 | pctx->errcode = ext2fs_allocate_inode_bitmap(fs, _("inode loop detection bitmap"), &inode_loop_detect); | |
337 | if (pctx->errcode) { | |
338 | pctx->num = 1; | |
339 | fix_problem(ctx, | |
340 | PR_3_ALLOCATE_IBITMAP_ERROR, pctx); | |
341 | ctx->flags |= E2F_FLAG_ABORT; | |
342 | return -1; | |
343 | } | |
344 | } | |
345 | p = dir; | |
3839e657 | 346 | } |
21c84b71 | 347 | } |
3839e657 TT |
348 | |
349 | /* | |
350 | * Make sure that .. and the parent directory are the same; | |
351 | * offer to fix it if not. | |
352 | */ | |
3839e657 | 353 | if (dir->parent != dir->dotdot) { |
21c84b71 TT |
354 | pctx->ino = dir->ino; |
355 | pctx->ino2 = dir->dotdot; | |
356 | pctx->dir = dir->parent; | |
1b6bf175 TT |
357 | if (fix_problem(ctx, PR_3_BAD_DOT_DOT, pctx)) |
358 | fix_dotdot(ctx, dir, dir->parent); | |
3839e657 | 359 | } |
28ffafb0 | 360 | return 0; |
b7a00563 | 361 | } |
3839e657 TT |
362 | |
363 | /* | |
364 | * This routine gets the lost_and_found inode, making it a directory | |
365 | * if necessary | |
366 | */ | |
86c627ec | 367 | static ext2_ino_t get_lost_and_found(e2fsck_t ctx) |
3839e657 | 368 | { |
1b6bf175 | 369 | ext2_filsys fs = ctx->fs; |
86c627ec | 370 | ext2_ino_t ino; |
3839e657 TT |
371 | blk_t blk; |
372 | errcode_t retval; | |
373 | struct ext2_inode inode; | |
374 | char * block; | |
53ef44c4 | 375 | static const char name[] = "lost+found"; |
1b6bf175 | 376 | struct problem_context pctx; |
4a9f5936 | 377 | struct dir_info *dirinfo; |
3839e657 | 378 | |
1b6bf175 TT |
379 | clear_problem_context(&pctx); |
380 | ||
21c84b71 TT |
381 | retval = ext2fs_lookup(fs, EXT2_ROOT_INO, name, |
382 | sizeof(name)-1, 0, &ino); | |
4a9f5936 TT |
383 | if (!retval) { |
384 | if (ext2fs_test_inode_bitmap(ctx->inode_dir_map, ino)) | |
385 | return ino; | |
386 | /* Lost+found isn't a directory! */ | |
387 | pctx.ino = ino; | |
388 | if (!fix_problem(ctx, PR_3_LPF_NOTDIR, &pctx)) | |
389 | return 0; | |
390 | ||
c54b3c3c | 391 | /* OK, unlink the old /lost+found file. */ |
4a9f5936 TT |
392 | pctx.errcode = ext2fs_unlink(fs, EXT2_ROOT_INO, name, ino, 0); |
393 | if (pctx.errcode) { | |
394 | pctx.str = "ext2fs_unlink"; | |
395 | fix_problem(ctx, PR_3_CREATE_LPF_ERROR, &pctx); | |
396 | return 0; | |
397 | } | |
398 | dirinfo = e2fsck_get_dir_info(ctx, ino); | |
399 | if (dirinfo) | |
400 | dirinfo->parent = 0; | |
401 | adjust_inode_count(ctx, ino, -1); | |
402 | } else if (retval != EXT2_ET_FILE_NOT_FOUND) { | |
1b6bf175 TT |
403 | pctx.errcode = retval; |
404 | fix_problem(ctx, PR_3_ERR_FIND_LPF, &pctx); | |
405 | } | |
406 | if (!fix_problem(ctx, PR_3_NO_LF_DIR, 0)) | |
3839e657 | 407 | return 0; |
3839e657 TT |
408 | |
409 | /* | |
410 | * Read the inode and block bitmaps in; we'll be messing with | |
411 | * them. | |
412 | */ | |
f8188fff | 413 | e2fsck_read_bitmaps(ctx); |
3839e657 TT |
414 | |
415 | /* | |
416 | * First, find a free block | |
417 | */ | |
1b6bf175 | 418 | retval = ext2fs_new_block(fs, 0, ctx->block_found_map, &blk); |
3839e657 | 419 | if (retval) { |
1b6bf175 TT |
420 | pctx.errcode = retval; |
421 | fix_problem(ctx, PR_3_ERR_LPF_NEW_BLOCK, &pctx); | |
3839e657 TT |
422 | return 0; |
423 | } | |
1b6bf175 | 424 | ext2fs_mark_block_bitmap(ctx->block_found_map, blk); |
f3db3566 | 425 | ext2fs_mark_block_bitmap(fs->block_map, blk); |
3839e657 TT |
426 | ext2fs_mark_bb_dirty(fs); |
427 | ||
428 | /* | |
429 | * Next find a free inode. | |
430 | */ | |
1b6bf175 TT |
431 | retval = ext2fs_new_inode(fs, EXT2_ROOT_INO, 040755, |
432 | ctx->inode_used_map, &ino); | |
3839e657 | 433 | if (retval) { |
1b6bf175 TT |
434 | pctx.errcode = retval; |
435 | fix_problem(ctx, PR_3_ERR_LPF_NEW_INODE, &pctx); | |
3839e657 TT |
436 | return 0; |
437 | } | |
1b6bf175 TT |
438 | ext2fs_mark_inode_bitmap(ctx->inode_used_map, ino); |
439 | ext2fs_mark_inode_bitmap(ctx->inode_dir_map, ino); | |
f3db3566 | 440 | ext2fs_mark_inode_bitmap(fs->inode_map, ino); |
3839e657 TT |
441 | ext2fs_mark_ib_dirty(fs); |
442 | ||
443 | /* | |
444 | * Now let's create the actual data block for the inode | |
445 | */ | |
446 | retval = ext2fs_new_dir_block(fs, ino, EXT2_ROOT_INO, &block); | |
447 | if (retval) { | |
1b6bf175 TT |
448 | pctx.errcode = retval; |
449 | fix_problem(ctx, PR_3_ERR_LPF_NEW_DIR_BLOCK, &pctx); | |
3839e657 TT |
450 | return 0; |
451 | } | |
452 | ||
50e1e10f | 453 | retval = ext2fs_write_dir_block(fs, blk, block); |
08b21301 | 454 | ext2fs_free_mem((void **) &block); |
3839e657 | 455 | if (retval) { |
1b6bf175 TT |
456 | pctx.errcode = retval; |
457 | fix_problem(ctx, PR_3_ERR_LPF_WRITE_BLOCK, &pctx); | |
3839e657 TT |
458 | return 0; |
459 | } | |
3839e657 TT |
460 | |
461 | /* | |
462 | * Set up the inode structure | |
463 | */ | |
464 | memset(&inode, 0, sizeof(inode)); | |
465 | inode.i_mode = 040755; | |
466 | inode.i_size = fs->blocksize; | |
467 | inode.i_atime = inode.i_ctime = inode.i_mtime = time(0); | |
468 | inode.i_links_count = 2; | |
469 | inode.i_blocks = fs->blocksize / 512; | |
470 | inode.i_block[0] = blk; | |
471 | ||
472 | /* | |
473 | * Next, write out the inode. | |
474 | */ | |
1b6bf175 TT |
475 | pctx.errcode = ext2fs_write_inode(fs, ino, &inode); |
476 | if (pctx.errcode) { | |
477 | pctx.str = "ext2fs_write_inode"; | |
478 | fix_problem(ctx, PR_3_CREATE_LPF_ERROR, &pctx); | |
3839e657 TT |
479 | return 0; |
480 | } | |
481 | /* | |
482 | * Finally, create the directory link | |
483 | */ | |
6fdc7a32 | 484 | pctx.errcode = ext2fs_link(fs, EXT2_ROOT_INO, name, ino, EXT2_FT_DIR); |
1b6bf175 TT |
485 | if (pctx.errcode) { |
486 | pctx.str = "ext2fs_link"; | |
487 | fix_problem(ctx, PR_3_CREATE_LPF_ERROR, &pctx); | |
3839e657 TT |
488 | return 0; |
489 | } | |
490 | ||
491 | /* | |
492 | * Miscellaneous bookkeeping that needs to be kept straight. | |
493 | */ | |
08b21301 | 494 | e2fsck_add_dir_info(ctx, ino, EXT2_ROOT_INO); |
53ef44c4 | 495 | adjust_inode_count(ctx, EXT2_ROOT_INO, 1); |
1b6bf175 TT |
496 | ext2fs_icount_store(ctx->inode_count, ino, 2); |
497 | ext2fs_icount_store(ctx->inode_link_info, ino, 2); | |
3839e657 | 498 | #if 0 |
f3db3566 | 499 | printf("/lost+found created; inode #%lu\n", ino); |
3839e657 TT |
500 | #endif |
501 | return ino; | |
502 | } | |
503 | ||
504 | /* | |
505 | * This routine will connect a file to lost+found | |
506 | */ | |
86c627ec | 507 | int e2fsck_reconnect_file(e2fsck_t ctx, ext2_ino_t ino) |
3839e657 | 508 | { |
1b6bf175 | 509 | ext2_filsys fs = ctx->fs; |
3839e657 TT |
510 | errcode_t retval; |
511 | char name[80]; | |
1b6bf175 | 512 | struct problem_context pctx; |
6fdc7a32 TT |
513 | struct ext2_inode inode; |
514 | int file_type = 0; | |
1b6bf175 TT |
515 | |
516 | clear_problem_context(&pctx); | |
6fdc7a32 | 517 | pctx.ino = ino; |
1b6bf175 TT |
518 | |
519 | if (!bad_lost_and_found && !lost_and_found) { | |
520 | lost_and_found = get_lost_and_found(ctx); | |
521 | if (!lost_and_found) | |
522 | bad_lost_and_found++; | |
523 | } | |
3839e657 | 524 | if (bad_lost_and_found) { |
1b6bf175 | 525 | fix_problem(ctx, PR_3_NO_LPF, &pctx); |
3839e657 TT |
526 | return 1; |
527 | } | |
1b6bf175 | 528 | |
86c627ec | 529 | sprintf(name, "#%u", ino); |
6fdc7a32 TT |
530 | if (ext2fs_read_inode(fs, ino, &inode) == 0) |
531 | file_type = ext2_file_type(inode.i_mode); | |
532 | retval = ext2fs_link(fs, lost_and_found, name, ino, file_type); | |
3839e657 | 533 | if (retval == EXT2_ET_DIR_NO_SPACE) { |
1b6bf175 | 534 | if (!fix_problem(ctx, PR_3_EXPAND_LF_DIR, &pctx)) |
3839e657 | 535 | return 1; |
b7a00563 | 536 | retval = e2fsck_expand_directory(ctx, lost_and_found, 1, 0); |
3839e657 | 537 | if (retval) { |
1b6bf175 TT |
538 | pctx.errcode = retval; |
539 | fix_problem(ctx, PR_3_CANT_EXPAND_LPF, &pctx); | |
3839e657 TT |
540 | return 1; |
541 | } | |
6fdc7a32 | 542 | retval = ext2fs_link(fs, lost_and_found, name, ino, file_type); |
3839e657 TT |
543 | } |
544 | if (retval) { | |
1b6bf175 TT |
545 | pctx.errcode = retval; |
546 | fix_problem(ctx, PR_3_CANT_RECONNECT, &pctx); | |
3839e657 TT |
547 | return 1; |
548 | } | |
53ef44c4 | 549 | adjust_inode_count(ctx, ino, 1); |
3839e657 TT |
550 | |
551 | return 0; | |
552 | } | |
553 | ||
554 | /* | |
555 | * Utility routine to adjust the inode counts on an inode. | |
556 | */ | |
86c627ec | 557 | static errcode_t adjust_inode_count(e2fsck_t ctx, ext2_ino_t ino, int adj) |
3839e657 | 558 | { |
1b6bf175 | 559 | ext2_filsys fs = ctx->fs; |
3839e657 TT |
560 | errcode_t retval; |
561 | struct ext2_inode inode; | |
562 | ||
563 | if (!ino) | |
564 | return 0; | |
565 | ||
566 | retval = ext2fs_read_inode(fs, ino, &inode); | |
567 | if (retval) | |
568 | return retval; | |
569 | ||
570 | #if 0 | |
f3db3566 | 571 | printf("Adjusting link count for inode %lu by %d (from %d)\n", ino, adj, |
3839e657 TT |
572 | inode.i_links_count); |
573 | #endif | |
574 | ||
21c84b71 | 575 | if (adj == 1) { |
1b6bf175 | 576 | ext2fs_icount_increment(ctx->inode_count, ino, 0); |
c1faf9cc TT |
577 | if (inode.i_links_count == (__u16) ~0) |
578 | return 0; | |
1b6bf175 | 579 | ext2fs_icount_increment(ctx->inode_link_info, ino, 0); |
c1faf9cc TT |
580 | inode.i_links_count++; |
581 | } else if (adj == -1) { | |
1b6bf175 | 582 | ext2fs_icount_decrement(ctx->inode_count, ino, 0); |
c1faf9cc TT |
583 | if (inode.i_links_count == 0) |
584 | return 0; | |
1b6bf175 | 585 | ext2fs_icount_decrement(ctx->inode_link_info, ino, 0); |
c1faf9cc TT |
586 | inode.i_links_count--; |
587 | } else { | |
588 | /* Should never happen */ | |
99a2cc96 TT |
589 | fatal_error(ctx, _("Debug error in e2fsck adjust_inode_count, " |
590 | "should never happen.\n")); | |
21c84b71 TT |
591 | } |
592 | ||
3839e657 TT |
593 | retval = ext2fs_write_inode(fs, ino, &inode); |
594 | if (retval) | |
595 | return retval; | |
596 | ||
597 | return 0; | |
598 | } | |
599 | ||
600 | /* | |
601 | * Fix parent --- this routine fixes up the parent of a directory. | |
602 | */ | |
603 | struct fix_dotdot_struct { | |
604 | ext2_filsys fs; | |
86c627ec | 605 | ext2_ino_t parent; |
3839e657 | 606 | int done; |
1b6bf175 | 607 | e2fsck_t ctx; |
3839e657 TT |
608 | }; |
609 | ||
610 | static int fix_dotdot_proc(struct ext2_dir_entry *dirent, | |
611 | int offset, | |
612 | int blocksize, | |
613 | char *buf, | |
54dc7ca2 | 614 | void *priv_data) |
3839e657 | 615 | { |
54dc7ca2 | 616 | struct fix_dotdot_struct *fp = (struct fix_dotdot_struct *) priv_data; |
3839e657 | 617 | errcode_t retval; |
1b6bf175 | 618 | struct problem_context pctx; |
3839e657 | 619 | |
b6f79831 | 620 | if ((dirent->name_len & 0xFF) != 2) |
3839e657 TT |
621 | return 0; |
622 | if (strncmp(dirent->name, "..", 2)) | |
623 | return 0; | |
3839e657 | 624 | |
1b6bf175 TT |
625 | clear_problem_context(&pctx); |
626 | ||
627 | retval = adjust_inode_count(fp->ctx, dirent->inode, -1); | |
628 | if (retval) { | |
629 | pctx.errcode = retval; | |
630 | fix_problem(fp->ctx, PR_3_ADJUST_INODE, &pctx); | |
631 | } | |
632 | retval = adjust_inode_count(fp->ctx, fp->parent, 1); | |
633 | if (retval) { | |
634 | pctx.errcode = retval; | |
635 | fix_problem(fp->ctx, PR_3_ADJUST_INODE, &pctx); | |
636 | } | |
3839e657 TT |
637 | dirent->inode = fp->parent; |
638 | ||
639 | fp->done++; | |
640 | return DIRENT_ABORT | DIRENT_CHANGED; | |
641 | } | |
642 | ||
86c627ec | 643 | static void fix_dotdot(e2fsck_t ctx, struct dir_info *dir, ext2_ino_t parent) |
3839e657 | 644 | { |
1b6bf175 | 645 | ext2_filsys fs = ctx->fs; |
3839e657 TT |
646 | errcode_t retval; |
647 | struct fix_dotdot_struct fp; | |
1b6bf175 | 648 | struct problem_context pctx; |
3839e657 TT |
649 | |
650 | fp.fs = fs; | |
651 | fp.parent = parent; | |
652 | fp.done = 0; | |
1b6bf175 | 653 | fp.ctx = ctx; |
3839e657 TT |
654 | |
655 | #if 0 | |
f3db3566 | 656 | printf("Fixing '..' of inode %lu to be %lu...\n", dir->ino, parent); |
3839e657 TT |
657 | #endif |
658 | ||
659 | retval = ext2fs_dir_iterate(fs, dir->ino, DIRENT_FLAG_INCLUDE_EMPTY, | |
660 | 0, fix_dotdot_proc, &fp); | |
661 | if (retval || !fp.done) { | |
1b6bf175 TT |
662 | clear_problem_context(&pctx); |
663 | pctx.ino = dir->ino; | |
664 | pctx.errcode = retval; | |
665 | fix_problem(ctx, retval ? PR_3_FIX_PARENT_ERR : | |
666 | PR_3_FIX_PARENT_NOFIND, &pctx); | |
3839e657 TT |
667 | ext2fs_unmark_valid(fs); |
668 | } | |
669 | dir->dotdot = parent; | |
670 | ||
671 | return; | |
672 | } | |
673 | ||
674 | /* | |
675 | * These routines are responsible for expanding a /lost+found if it is | |
676 | * too small. | |
677 | */ | |
678 | ||
679 | struct expand_dir_struct { | |
b7a00563 TT |
680 | int num; |
681 | int guaranteed_size; | |
c1faf9cc | 682 | int newblocks; |
b7a00563 | 683 | int last_block; |
c1faf9cc TT |
684 | errcode_t err; |
685 | e2fsck_t ctx; | |
3839e657 TT |
686 | }; |
687 | ||
688 | static int expand_dir_proc(ext2_filsys fs, | |
689 | blk_t *blocknr, | |
133a56dc TT |
690 | e2_blkcnt_t blockcnt, |
691 | blk_t ref_block, | |
692 | int ref_offset, | |
54dc7ca2 | 693 | void *priv_data) |
3839e657 | 694 | { |
54dc7ca2 | 695 | struct expand_dir_struct *es = (struct expand_dir_struct *) priv_data; |
3839e657 TT |
696 | blk_t new_blk; |
697 | static blk_t last_blk = 0; | |
698 | char *block; | |
699 | errcode_t retval; | |
1b6bf175 TT |
700 | e2fsck_t ctx; |
701 | ||
702 | ctx = es->ctx; | |
3839e657 | 703 | |
b7a00563 TT |
704 | if (es->guaranteed_size && blockcnt >= es->guaranteed_size) |
705 | return BLOCK_ABORT; | |
706 | ||
707 | if (blockcnt > 0) | |
708 | es->last_block = blockcnt; | |
3839e657 TT |
709 | if (*blocknr) { |
710 | last_blk = *blocknr; | |
711 | return 0; | |
712 | } | |
1b6bf175 TT |
713 | retval = ext2fs_new_block(fs, last_blk, ctx->block_found_map, |
714 | &new_blk); | |
3839e657 TT |
715 | if (retval) { |
716 | es->err = retval; | |
717 | return BLOCK_ABORT; | |
718 | } | |
719 | if (blockcnt > 0) { | |
720 | retval = ext2fs_new_dir_block(fs, 0, 0, &block); | |
721 | if (retval) { | |
722 | es->err = retval; | |
723 | return BLOCK_ABORT; | |
724 | } | |
b7a00563 | 725 | es->num--; |
b8647faa | 726 | retval = ext2fs_write_dir_block(fs, new_blk, block); |
3839e657 | 727 | } else { |
08b21301 TT |
728 | retval = ext2fs_get_mem(fs->blocksize, (void **) &block); |
729 | if (retval) { | |
730 | es->err = retval; | |
3839e657 TT |
731 | return BLOCK_ABORT; |
732 | } | |
733 | memset(block, 0, fs->blocksize); | |
b8647faa | 734 | retval = io_channel_write_blk(fs->io, new_blk, 1, block); |
3839e657 | 735 | } |
3839e657 TT |
736 | if (retval) { |
737 | es->err = retval; | |
738 | return BLOCK_ABORT; | |
739 | } | |
08b21301 | 740 | ext2fs_free_mem((void **) &block); |
3839e657 | 741 | *blocknr = new_blk; |
1b6bf175 | 742 | ext2fs_mark_block_bitmap(ctx->block_found_map, new_blk); |
b7a00563 | 743 | ext2fs_block_alloc_stats(fs, new_blk, +1); |
c1faf9cc TT |
744 | es->newblocks++; |
745 | ||
b7a00563 | 746 | if (es->num == 0) |
3839e657 TT |
747 | return (BLOCK_CHANGED | BLOCK_ABORT); |
748 | else | |
749 | return BLOCK_CHANGED; | |
750 | } | |
751 | ||
b7a00563 TT |
752 | errcode_t e2fsck_expand_directory(e2fsck_t ctx, ext2_ino_t dir, |
753 | int num, int guaranteed_size) | |
3839e657 | 754 | { |
1b6bf175 | 755 | ext2_filsys fs = ctx->fs; |
3839e657 TT |
756 | errcode_t retval; |
757 | struct expand_dir_struct es; | |
758 | struct ext2_inode inode; | |
759 | ||
760 | if (!(fs->flags & EXT2_FLAG_RW)) | |
761 | return EXT2_ET_RO_FILSYS; | |
762 | ||
b8647faa TT |
763 | /* |
764 | * Read the inode and block bitmaps in; we'll be messing with | |
765 | * them. | |
766 | */ | |
767 | e2fsck_read_bitmaps(ctx); | |
c1faf9cc | 768 | |
3839e657 TT |
769 | retval = ext2fs_check_directory(fs, dir); |
770 | if (retval) | |
771 | return retval; | |
772 | ||
b7a00563 TT |
773 | es.num = num; |
774 | es.guaranteed_size = guaranteed_size; | |
775 | es.last_block = 0; | |
3839e657 | 776 | es.err = 0; |
c1faf9cc | 777 | es.newblocks = 0; |
1b6bf175 | 778 | es.ctx = ctx; |
3839e657 | 779 | |
133a56dc TT |
780 | retval = ext2fs_block_iterate2(fs, dir, BLOCK_FLAG_APPEND, |
781 | 0, expand_dir_proc, &es); | |
3839e657 TT |
782 | |
783 | if (es.err) | |
784 | return es.err; | |
3839e657 TT |
785 | |
786 | /* | |
787 | * Update the size and block count fields in the inode. | |
788 | */ | |
789 | retval = ext2fs_read_inode(fs, dir, &inode); | |
790 | if (retval) | |
791 | return retval; | |
792 | ||
b7a00563 | 793 | inode.i_size = (es.last_block + 1) * fs->blocksize; |
c1faf9cc | 794 | inode.i_blocks += (fs->blocksize / 512) * es.newblocks; |
3839e657 | 795 | |
08b21301 | 796 | e2fsck_write_inode(ctx, dir, &inode, "expand_directory"); |
3839e657 TT |
797 | |
798 | return 0; | |
799 | } | |
b7a00563 | 800 |