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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); | |
50 | static errcode_t expand_directory(e2fsck_t ctx, ext2_ino_t dir); | |
3839e657 | 51 | |
86c627ec | 52 | static ext2_ino_t lost_and_found = 0; |
3839e657 TT |
53 | static int bad_lost_and_found = 0; |
54 | ||
a02ce9df TT |
55 | static ext2fs_inode_bitmap inode_loop_detect = 0; |
56 | static ext2fs_inode_bitmap inode_done_map = 0; | |
3839e657 | 57 | |
08b21301 | 58 | void e2fsck_pass3(e2fsck_t ctx) |
3839e657 | 59 | { |
1b6bf175 | 60 | ext2_filsys fs = ctx->fs; |
3839e657 | 61 | int i; |
8bf191e8 | 62 | #ifdef RESOURCE_TRACK |
3839e657 | 63 | struct resource_track rtrack; |
8bf191e8 | 64 | #endif |
21c84b71 TT |
65 | struct problem_context pctx; |
66 | struct dir_info *dir; | |
7f813ba3 | 67 | unsigned long maxdirs, count; |
f8188fff | 68 | |
8bf191e8 | 69 | #ifdef RESOURCE_TRACK |
3839e657 | 70 | init_resource_track(&rtrack); |
8bf191e8 | 71 | #endif |
3839e657 | 72 | |
1b6bf175 TT |
73 | clear_problem_context(&pctx); |
74 | ||
3839e657 TT |
75 | #ifdef MTRACE |
76 | mtrace_print("Pass 3"); | |
77 | #endif | |
78 | ||
1b6bf175 TT |
79 | if (!(ctx->options & E2F_OPT_PREEN)) |
80 | fix_problem(ctx, PR_3_PASS_HEADER, &pctx); | |
3839e657 TT |
81 | |
82 | /* | |
83 | * Allocate some bitmaps to do loop detection. | |
84 | */ | |
0c4a0726 | 85 | pctx.errcode = ext2fs_allocate_inode_bitmap(fs, _("inode done bitmap"), |
1b6bf175 TT |
86 | &inode_done_map); |
87 | if (pctx.errcode) { | |
88 | pctx.num = 2; | |
89 | fix_problem(ctx, PR_3_ALLOCATE_IBITMAP_ERROR, &pctx); | |
08b21301 | 90 | ctx->flags |= E2F_FLAG_ABORT; |
a02ce9df | 91 | goto abort_exit; |
3839e657 | 92 | } |
8bf191e8 | 93 | #ifdef RESOURCE_TRACK |
5596defa TT |
94 | if (ctx->options & E2F_OPT_TIME) { |
95 | e2fsck_clear_progbar(ctx); | |
0c4a0726 | 96 | print_resource_track(_("Peak memory"), &ctx->global_rtrack); |
5596defa | 97 | } |
8bf191e8 | 98 | #endif |
3839e657 | 99 | |
1b6bf175 | 100 | check_root(ctx); |
a02ce9df TT |
101 | if (ctx->flags & E2F_FLAG_SIGNAL_MASK) |
102 | goto abort_exit; | |
08b21301 | 103 | |
f3db3566 | 104 | ext2fs_mark_inode_bitmap(inode_done_map, EXT2_ROOT_INO); |
3839e657 | 105 | |
7f813ba3 | 106 | maxdirs = e2fsck_get_num_dirinfo(ctx); |
f75c28de | 107 | count = 1; |
f8188fff | 108 | |
f75c28de | 109 | if (ctx->progress) |
7f813ba3 | 110 | if ((ctx->progress)(ctx, 3, 0, maxdirs)) |
f75c28de TT |
111 | goto abort_exit; |
112 | ||
08b21301 | 113 | for (i=0; (dir = e2fsck_dir_info_iter(ctx, &i)) != 0;) { |
f8188fff | 114 | if (ctx->progress) |
7f813ba3 | 115 | if ((ctx->progress)(ctx, 3, count++, maxdirs)) |
a02ce9df | 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 | } | |
8bf191e8 | 138 | #ifdef RESOURCE_TRACK |
5596defa TT |
139 | if (ctx->options & E2F_OPT_TIME2) { |
140 | e2fsck_clear_progbar(ctx); | |
0c4a0726 | 141 | print_resource_track(_("Pass 3"), &rtrack); |
5596defa | 142 | } |
8bf191e8 | 143 | #endif |
3839e657 TT |
144 | } |
145 | ||
146 | /* | |
147 | * This makes sure the root inode is present; if not, we ask if the | |
148 | * user wants us to create it. Not creating it is a fatal error. | |
149 | */ | |
1b6bf175 | 150 | static void check_root(e2fsck_t ctx) |
3839e657 | 151 | { |
1b6bf175 | 152 | ext2_filsys fs = ctx->fs; |
3839e657 | 153 | blk_t blk; |
3839e657 TT |
154 | struct ext2_inode inode; |
155 | char * block; | |
1b6bf175 | 156 | struct problem_context pctx; |
3839e657 | 157 | |
1b6bf175 TT |
158 | clear_problem_context(&pctx); |
159 | ||
160 | if (ext2fs_test_inode_bitmap(ctx->inode_used_map, EXT2_ROOT_INO)) { | |
3839e657 | 161 | /* |
08b21301 | 162 | * If the root inode is not a directory, die here. The |
3839e657 TT |
163 | * user must have answered 'no' in pass1 when we |
164 | * offered to clear it. | |
165 | */ | |
1b6bf175 | 166 | if (!(ext2fs_test_inode_bitmap(ctx->inode_dir_map, |
f8188fff TT |
167 | EXT2_ROOT_INO))) { |
168 | fix_problem(ctx, PR_3_ROOT_NOT_DIR_ABORT, &pctx); | |
169 | ctx->flags |= E2F_FLAG_ABORT; | |
170 | } | |
3839e657 TT |
171 | return; |
172 | } | |
173 | ||
f8188fff TT |
174 | if (!fix_problem(ctx, PR_3_NO_ROOT_INODE, &pctx)) { |
175 | fix_problem(ctx, PR_3_NO_ROOT_INODE_ABORT, &pctx); | |
176 | ctx->flags |= E2F_FLAG_ABORT; | |
177 | return; | |
178 | } | |
3839e657 | 179 | |
f8188fff | 180 | e2fsck_read_bitmaps(ctx); |
3839e657 TT |
181 | |
182 | /* | |
183 | * First, find a free block | |
184 | */ | |
1b6bf175 TT |
185 | pctx.errcode = ext2fs_new_block(fs, 0, ctx->block_found_map, &blk); |
186 | if (pctx.errcode) { | |
187 | pctx.str = "ext2fs_new_block"; | |
188 | fix_problem(ctx, PR_3_CREATE_ROOT_ERROR, &pctx); | |
08b21301 TT |
189 | ctx->flags |= E2F_FLAG_ABORT; |
190 | return; | |
3839e657 | 191 | } |
1b6bf175 | 192 | ext2fs_mark_block_bitmap(ctx->block_found_map, blk); |
f3db3566 | 193 | ext2fs_mark_block_bitmap(fs->block_map, blk); |
3839e657 TT |
194 | ext2fs_mark_bb_dirty(fs); |
195 | ||
196 | /* | |
197 | * Now let's create the actual data block for the inode | |
198 | */ | |
1b6bf175 TT |
199 | pctx.errcode = ext2fs_new_dir_block(fs, EXT2_ROOT_INO, EXT2_ROOT_INO, |
200 | &block); | |
201 | if (pctx.errcode) { | |
202 | pctx.str = "ext2fs_new_dir_block"; | |
203 | fix_problem(ctx, PR_3_CREATE_ROOT_ERROR, &pctx); | |
08b21301 TT |
204 | ctx->flags |= E2F_FLAG_ABORT; |
205 | return; | |
3839e657 TT |
206 | } |
207 | ||
1b6bf175 TT |
208 | pctx.errcode = ext2fs_write_dir_block(fs, blk, block); |
209 | if (pctx.errcode) { | |
210 | pctx.str = "ext2fs_write_dir_block"; | |
211 | fix_problem(ctx, PR_3_CREATE_ROOT_ERROR, &pctx); | |
08b21301 TT |
212 | ctx->flags |= E2F_FLAG_ABORT; |
213 | return; | |
3839e657 | 214 | } |
08b21301 | 215 | ext2fs_free_mem((void **) &block); |
3839e657 TT |
216 | |
217 | /* | |
218 | * Set up the inode structure | |
219 | */ | |
220 | memset(&inode, 0, sizeof(inode)); | |
221 | inode.i_mode = 040755; | |
222 | inode.i_size = fs->blocksize; | |
223 | inode.i_atime = inode.i_ctime = inode.i_mtime = time(0); | |
224 | inode.i_links_count = 2; | |
225 | inode.i_blocks = fs->blocksize / 512; | |
226 | inode.i_block[0] = blk; | |
227 | ||
228 | /* | |
229 | * Write out the inode. | |
230 | */ | |
1b6bf175 TT |
231 | pctx.errcode = ext2fs_write_inode(fs, EXT2_ROOT_INO, &inode); |
232 | if (pctx.errcode) { | |
233 | pctx.str = "ext2fs_write_inode"; | |
234 | fix_problem(ctx, PR_3_CREATE_ROOT_ERROR, &pctx); | |
08b21301 TT |
235 | ctx->flags |= E2F_FLAG_ABORT; |
236 | return; | |
3839e657 TT |
237 | } |
238 | ||
239 | /* | |
240 | * Miscellaneous bookkeeping... | |
241 | */ | |
08b21301 | 242 | e2fsck_add_dir_info(ctx, EXT2_ROOT_INO, EXT2_ROOT_INO); |
1b6bf175 TT |
243 | ext2fs_icount_store(ctx->inode_count, EXT2_ROOT_INO, 2); |
244 | ext2fs_icount_store(ctx->inode_link_info, EXT2_ROOT_INO, 2); | |
3839e657 | 245 | |
1b6bf175 TT |
246 | ext2fs_mark_inode_bitmap(ctx->inode_used_map, EXT2_ROOT_INO); |
247 | ext2fs_mark_inode_bitmap(ctx->inode_dir_map, EXT2_ROOT_INO); | |
f3db3566 | 248 | ext2fs_mark_inode_bitmap(fs->inode_map, EXT2_ROOT_INO); |
3839e657 TT |
249 | ext2fs_mark_ib_dirty(fs); |
250 | } | |
251 | ||
252 | /* | |
253 | * This subroutine is responsible for making sure that a particular | |
254 | * directory is connected to the root; if it isn't we trace it up as | |
255 | * far as we can go, and then offer to connect the resulting parent to | |
256 | * the lost+found. We have to do loop detection; if we ever discover | |
257 | * a loop, we treat that as a disconnected directory and offer to | |
258 | * reparent it to lost+found. | |
28ffafb0 TT |
259 | * |
260 | * However, loop detection is expensive, because for very large | |
261 | * filesystems, the inode_loop_detect bitmap is huge, and clearing it | |
262 | * is non-trivial. Loops in filesystems are also a rare error case, | |
263 | * and we shouldn't optimize for error cases. So we try two passes of | |
264 | * the algorithm. The first time, we ignore loop detection and merely | |
265 | * increment a counter; if the counter exceeds some extreme threshold, | |
266 | * then we try again with the loop detection bitmap enabled. | |
3839e657 | 267 | */ |
28ffafb0 TT |
268 | static int check_directory(e2fsck_t ctx, struct dir_info *dir, |
269 | struct problem_context *pctx) | |
3839e657 | 270 | { |
28ffafb0 | 271 | ext2_filsys fs = ctx->fs; |
21c84b71 | 272 | struct dir_info *p = dir; |
28ffafb0 | 273 | int loop_pass = 0, parent_count = 0; |
3839e657 | 274 | |
7f813ba3 | 275 | if (!p) |
28ffafb0 | 276 | return 0; |
7f813ba3 | 277 | |
28ffafb0 | 278 | while (1) { |
3839e657 TT |
279 | /* |
280 | * Mark this inode as being "done"; by the time we | |
281 | * return from this function, the inode we either be | |
282 | * verified as being connected to the directory tree, | |
283 | * or we will have offered to reconnect this to | |
284 | * lost+found. | |
28ffafb0 TT |
285 | * |
286 | * If it was marked done already, then we've reached a | |
287 | * parent we've already checked. | |
3839e657 | 288 | */ |
28ffafb0 TT |
289 | if (ext2fs_mark_inode_bitmap(inode_done_map, p->ino)) |
290 | break; | |
7f813ba3 | 291 | |
3839e657 TT |
292 | /* |
293 | * If this directory doesn't have a parent, or we've | |
294 | * seen the parent once already, then offer to | |
295 | * reparent it to lost+found | |
296 | */ | |
297 | if (!p->parent || | |
28ffafb0 TT |
298 | (loop_pass && |
299 | (ext2fs_test_inode_bitmap(inode_loop_detect, | |
300 | p->parent)))) { | |
7f813ba3 TT |
301 | pctx->ino = p->ino; |
302 | if (fix_problem(ctx, PR_3_UNCONNECTED_DIR, pctx)) { | |
303 | if (e2fsck_reconnect_file(ctx, p->ino)) | |
304 | ext2fs_unmark_valid(fs); | |
305 | else { | |
306 | p->parent = lost_and_found; | |
307 | fix_dotdot(ctx, p, lost_and_found); | |
308 | } | |
309 | } | |
3839e657 | 310 | break; |
7f813ba3 | 311 | } |
08b21301 | 312 | p = e2fsck_get_dir_info(ctx, p->parent); |
7f813ba3 TT |
313 | if (!p) { |
314 | fix_problem(ctx, PR_3_NO_DIRINFO, pctx); | |
28ffafb0 TT |
315 | return 0; |
316 | } | |
317 | if (loop_pass) { | |
318 | ext2fs_mark_inode_bitmap(inode_loop_detect, | |
319 | p->ino); | |
320 | } else if (parent_count++ > 2048) { | |
321 | /* | |
322 | * If we've run into a path depth that's | |
323 | * greater than 2048, try again with the inode | |
324 | * loop bitmap turned on and start from the | |
325 | * top. | |
326 | */ | |
327 | loop_pass = 1; | |
328 | if (inode_loop_detect) | |
329 | ext2fs_clear_inode_bitmap(inode_loop_detect); | |
330 | else { | |
331 | pctx->errcode = ext2fs_allocate_inode_bitmap(fs, _("inode loop detection bitmap"), &inode_loop_detect); | |
332 | if (pctx->errcode) { | |
333 | pctx->num = 1; | |
334 | fix_problem(ctx, | |
335 | PR_3_ALLOCATE_IBITMAP_ERROR, pctx); | |
336 | ctx->flags |= E2F_FLAG_ABORT; | |
337 | return -1; | |
338 | } | |
339 | } | |
340 | p = dir; | |
3839e657 | 341 | } |
21c84b71 | 342 | } |
3839e657 TT |
343 | |
344 | /* | |
345 | * Make sure that .. and the parent directory are the same; | |
346 | * offer to fix it if not. | |
347 | */ | |
3839e657 | 348 | if (dir->parent != dir->dotdot) { |
21c84b71 TT |
349 | pctx->ino = dir->ino; |
350 | pctx->ino2 = dir->dotdot; | |
351 | pctx->dir = dir->parent; | |
1b6bf175 TT |
352 | if (fix_problem(ctx, PR_3_BAD_DOT_DOT, pctx)) |
353 | fix_dotdot(ctx, dir, dir->parent); | |
3839e657 | 354 | } |
28ffafb0 | 355 | return 0; |
3839e657 TT |
356 | } |
357 | ||
358 | /* | |
359 | * This routine gets the lost_and_found inode, making it a directory | |
360 | * if necessary | |
361 | */ | |
86c627ec | 362 | static ext2_ino_t get_lost_and_found(e2fsck_t ctx) |
3839e657 | 363 | { |
1b6bf175 | 364 | ext2_filsys fs = ctx->fs; |
86c627ec | 365 | ext2_ino_t ino; |
3839e657 TT |
366 | blk_t blk; |
367 | errcode_t retval; | |
368 | struct ext2_inode inode; | |
369 | char * block; | |
53ef44c4 | 370 | static const char name[] = "lost+found"; |
1b6bf175 | 371 | struct problem_context pctx; |
4a9f5936 | 372 | struct dir_info *dirinfo; |
3839e657 | 373 | |
1b6bf175 TT |
374 | clear_problem_context(&pctx); |
375 | ||
21c84b71 TT |
376 | retval = ext2fs_lookup(fs, EXT2_ROOT_INO, name, |
377 | sizeof(name)-1, 0, &ino); | |
4a9f5936 TT |
378 | if (!retval) { |
379 | if (ext2fs_test_inode_bitmap(ctx->inode_dir_map, ino)) | |
380 | return ino; | |
381 | /* Lost+found isn't a directory! */ | |
382 | pctx.ino = ino; | |
383 | if (!fix_problem(ctx, PR_3_LPF_NOTDIR, &pctx)) | |
384 | return 0; | |
385 | ||
c54b3c3c | 386 | /* OK, unlink the old /lost+found file. */ |
4a9f5936 TT |
387 | pctx.errcode = ext2fs_unlink(fs, EXT2_ROOT_INO, name, ino, 0); |
388 | if (pctx.errcode) { | |
389 | pctx.str = "ext2fs_unlink"; | |
390 | fix_problem(ctx, PR_3_CREATE_LPF_ERROR, &pctx); | |
391 | return 0; | |
392 | } | |
393 | dirinfo = e2fsck_get_dir_info(ctx, ino); | |
394 | if (dirinfo) | |
395 | dirinfo->parent = 0; | |
396 | adjust_inode_count(ctx, ino, -1); | |
397 | } else if (retval != EXT2_ET_FILE_NOT_FOUND) { | |
1b6bf175 TT |
398 | pctx.errcode = retval; |
399 | fix_problem(ctx, PR_3_ERR_FIND_LPF, &pctx); | |
400 | } | |
401 | if (!fix_problem(ctx, PR_3_NO_LF_DIR, 0)) | |
3839e657 | 402 | return 0; |
3839e657 TT |
403 | |
404 | /* | |
405 | * Read the inode and block bitmaps in; we'll be messing with | |
406 | * them. | |
407 | */ | |
f8188fff | 408 | e2fsck_read_bitmaps(ctx); |
3839e657 TT |
409 | |
410 | /* | |
411 | * First, find a free block | |
412 | */ | |
1b6bf175 | 413 | retval = ext2fs_new_block(fs, 0, ctx->block_found_map, &blk); |
3839e657 | 414 | if (retval) { |
1b6bf175 TT |
415 | pctx.errcode = retval; |
416 | fix_problem(ctx, PR_3_ERR_LPF_NEW_BLOCK, &pctx); | |
3839e657 TT |
417 | return 0; |
418 | } | |
1b6bf175 | 419 | ext2fs_mark_block_bitmap(ctx->block_found_map, blk); |
f3db3566 | 420 | ext2fs_mark_block_bitmap(fs->block_map, blk); |
3839e657 TT |
421 | ext2fs_mark_bb_dirty(fs); |
422 | ||
423 | /* | |
424 | * Next find a free inode. | |
425 | */ | |
1b6bf175 TT |
426 | retval = ext2fs_new_inode(fs, EXT2_ROOT_INO, 040755, |
427 | ctx->inode_used_map, &ino); | |
3839e657 | 428 | if (retval) { |
1b6bf175 TT |
429 | pctx.errcode = retval; |
430 | fix_problem(ctx, PR_3_ERR_LPF_NEW_INODE, &pctx); | |
3839e657 TT |
431 | return 0; |
432 | } | |
1b6bf175 TT |
433 | ext2fs_mark_inode_bitmap(ctx->inode_used_map, ino); |
434 | ext2fs_mark_inode_bitmap(ctx->inode_dir_map, ino); | |
f3db3566 | 435 | ext2fs_mark_inode_bitmap(fs->inode_map, ino); |
3839e657 TT |
436 | ext2fs_mark_ib_dirty(fs); |
437 | ||
438 | /* | |
439 | * Now let's create the actual data block for the inode | |
440 | */ | |
441 | retval = ext2fs_new_dir_block(fs, ino, EXT2_ROOT_INO, &block); | |
442 | if (retval) { | |
1b6bf175 TT |
443 | pctx.errcode = retval; |
444 | fix_problem(ctx, PR_3_ERR_LPF_NEW_DIR_BLOCK, &pctx); | |
3839e657 TT |
445 | return 0; |
446 | } | |
447 | ||
50e1e10f | 448 | retval = ext2fs_write_dir_block(fs, blk, block); |
08b21301 | 449 | ext2fs_free_mem((void **) &block); |
3839e657 | 450 | if (retval) { |
1b6bf175 TT |
451 | pctx.errcode = retval; |
452 | fix_problem(ctx, PR_3_ERR_LPF_WRITE_BLOCK, &pctx); | |
3839e657 TT |
453 | return 0; |
454 | } | |
3839e657 TT |
455 | |
456 | /* | |
457 | * Set up the inode structure | |
458 | */ | |
459 | memset(&inode, 0, sizeof(inode)); | |
460 | inode.i_mode = 040755; | |
461 | inode.i_size = fs->blocksize; | |
462 | inode.i_atime = inode.i_ctime = inode.i_mtime = time(0); | |
463 | inode.i_links_count = 2; | |
464 | inode.i_blocks = fs->blocksize / 512; | |
465 | inode.i_block[0] = blk; | |
466 | ||
467 | /* | |
468 | * Next, write out the inode. | |
469 | */ | |
1b6bf175 TT |
470 | pctx.errcode = ext2fs_write_inode(fs, ino, &inode); |
471 | if (pctx.errcode) { | |
472 | pctx.str = "ext2fs_write_inode"; | |
473 | fix_problem(ctx, PR_3_CREATE_LPF_ERROR, &pctx); | |
3839e657 TT |
474 | return 0; |
475 | } | |
476 | /* | |
477 | * Finally, create the directory link | |
478 | */ | |
6fdc7a32 | 479 | pctx.errcode = ext2fs_link(fs, EXT2_ROOT_INO, name, ino, EXT2_FT_DIR); |
1b6bf175 TT |
480 | if (pctx.errcode) { |
481 | pctx.str = "ext2fs_link"; | |
482 | fix_problem(ctx, PR_3_CREATE_LPF_ERROR, &pctx); | |
3839e657 TT |
483 | return 0; |
484 | } | |
485 | ||
486 | /* | |
487 | * Miscellaneous bookkeeping that needs to be kept straight. | |
488 | */ | |
08b21301 | 489 | e2fsck_add_dir_info(ctx, ino, EXT2_ROOT_INO); |
53ef44c4 | 490 | adjust_inode_count(ctx, EXT2_ROOT_INO, 1); |
1b6bf175 TT |
491 | ext2fs_icount_store(ctx->inode_count, ino, 2); |
492 | ext2fs_icount_store(ctx->inode_link_info, ino, 2); | |
3839e657 | 493 | #if 0 |
f3db3566 | 494 | printf("/lost+found created; inode #%lu\n", ino); |
3839e657 TT |
495 | #endif |
496 | return ino; | |
497 | } | |
498 | ||
499 | /* | |
500 | * This routine will connect a file to lost+found | |
501 | */ | |
86c627ec | 502 | int e2fsck_reconnect_file(e2fsck_t ctx, ext2_ino_t ino) |
3839e657 | 503 | { |
1b6bf175 | 504 | ext2_filsys fs = ctx->fs; |
3839e657 TT |
505 | errcode_t retval; |
506 | char name[80]; | |
1b6bf175 | 507 | struct problem_context pctx; |
6fdc7a32 TT |
508 | struct ext2_inode inode; |
509 | int file_type = 0; | |
1b6bf175 TT |
510 | |
511 | clear_problem_context(&pctx); | |
6fdc7a32 | 512 | pctx.ino = ino; |
1b6bf175 TT |
513 | |
514 | if (!bad_lost_and_found && !lost_and_found) { | |
515 | lost_and_found = get_lost_and_found(ctx); | |
516 | if (!lost_and_found) | |
517 | bad_lost_and_found++; | |
518 | } | |
3839e657 | 519 | if (bad_lost_and_found) { |
1b6bf175 | 520 | fix_problem(ctx, PR_3_NO_LPF, &pctx); |
3839e657 TT |
521 | return 1; |
522 | } | |
1b6bf175 | 523 | |
86c627ec | 524 | sprintf(name, "#%u", ino); |
6fdc7a32 TT |
525 | if (ext2fs_read_inode(fs, ino, &inode) == 0) |
526 | file_type = ext2_file_type(inode.i_mode); | |
527 | retval = ext2fs_link(fs, lost_and_found, name, ino, file_type); | |
3839e657 | 528 | if (retval == EXT2_ET_DIR_NO_SPACE) { |
1b6bf175 | 529 | if (!fix_problem(ctx, PR_3_EXPAND_LF_DIR, &pctx)) |
3839e657 | 530 | return 1; |
1b6bf175 | 531 | retval = expand_directory(ctx, lost_and_found); |
3839e657 | 532 | if (retval) { |
1b6bf175 TT |
533 | pctx.errcode = retval; |
534 | fix_problem(ctx, PR_3_CANT_EXPAND_LPF, &pctx); | |
3839e657 TT |
535 | return 1; |
536 | } | |
6fdc7a32 | 537 | retval = ext2fs_link(fs, lost_and_found, name, ino, file_type); |
3839e657 TT |
538 | } |
539 | if (retval) { | |
1b6bf175 TT |
540 | pctx.errcode = retval; |
541 | fix_problem(ctx, PR_3_CANT_RECONNECT, &pctx); | |
3839e657 TT |
542 | return 1; |
543 | } | |
53ef44c4 | 544 | adjust_inode_count(ctx, ino, 1); |
3839e657 TT |
545 | |
546 | return 0; | |
547 | } | |
548 | ||
549 | /* | |
550 | * Utility routine to adjust the inode counts on an inode. | |
551 | */ | |
86c627ec | 552 | static errcode_t adjust_inode_count(e2fsck_t ctx, ext2_ino_t ino, int adj) |
3839e657 | 553 | { |
1b6bf175 | 554 | ext2_filsys fs = ctx->fs; |
3839e657 TT |
555 | errcode_t retval; |
556 | struct ext2_inode inode; | |
557 | ||
558 | if (!ino) | |
559 | return 0; | |
560 | ||
561 | retval = ext2fs_read_inode(fs, ino, &inode); | |
562 | if (retval) | |
563 | return retval; | |
564 | ||
565 | #if 0 | |
f3db3566 | 566 | printf("Adjusting link count for inode %lu by %d (from %d)\n", ino, adj, |
3839e657 TT |
567 | inode.i_links_count); |
568 | #endif | |
569 | ||
21c84b71 | 570 | if (adj == 1) { |
1b6bf175 | 571 | ext2fs_icount_increment(ctx->inode_count, ino, 0); |
c1faf9cc TT |
572 | if (inode.i_links_count == (__u16) ~0) |
573 | return 0; | |
1b6bf175 | 574 | ext2fs_icount_increment(ctx->inode_link_info, ino, 0); |
c1faf9cc TT |
575 | inode.i_links_count++; |
576 | } else if (adj == -1) { | |
1b6bf175 | 577 | ext2fs_icount_decrement(ctx->inode_count, ino, 0); |
c1faf9cc TT |
578 | if (inode.i_links_count == 0) |
579 | return 0; | |
1b6bf175 | 580 | ext2fs_icount_decrement(ctx->inode_link_info, ino, 0); |
c1faf9cc TT |
581 | inode.i_links_count--; |
582 | } else { | |
583 | /* Should never happen */ | |
99a2cc96 TT |
584 | fatal_error(ctx, _("Debug error in e2fsck adjust_inode_count, " |
585 | "should never happen.\n")); | |
21c84b71 TT |
586 | } |
587 | ||
3839e657 TT |
588 | retval = ext2fs_write_inode(fs, ino, &inode); |
589 | if (retval) | |
590 | return retval; | |
591 | ||
592 | return 0; | |
593 | } | |
594 | ||
595 | /* | |
596 | * Fix parent --- this routine fixes up the parent of a directory. | |
597 | */ | |
598 | struct fix_dotdot_struct { | |
599 | ext2_filsys fs; | |
86c627ec | 600 | ext2_ino_t parent; |
3839e657 | 601 | int done; |
1b6bf175 | 602 | e2fsck_t ctx; |
3839e657 TT |
603 | }; |
604 | ||
605 | static int fix_dotdot_proc(struct ext2_dir_entry *dirent, | |
606 | int offset, | |
607 | int blocksize, | |
608 | char *buf, | |
54dc7ca2 | 609 | void *priv_data) |
3839e657 | 610 | { |
54dc7ca2 | 611 | struct fix_dotdot_struct *fp = (struct fix_dotdot_struct *) priv_data; |
3839e657 | 612 | errcode_t retval; |
1b6bf175 | 613 | struct problem_context pctx; |
3839e657 | 614 | |
b6f79831 | 615 | if ((dirent->name_len & 0xFF) != 2) |
3839e657 TT |
616 | return 0; |
617 | if (strncmp(dirent->name, "..", 2)) | |
618 | return 0; | |
3839e657 | 619 | |
1b6bf175 TT |
620 | clear_problem_context(&pctx); |
621 | ||
622 | retval = adjust_inode_count(fp->ctx, dirent->inode, -1); | |
623 | if (retval) { | |
624 | pctx.errcode = retval; | |
625 | fix_problem(fp->ctx, PR_3_ADJUST_INODE, &pctx); | |
626 | } | |
627 | retval = adjust_inode_count(fp->ctx, fp->parent, 1); | |
628 | if (retval) { | |
629 | pctx.errcode = retval; | |
630 | fix_problem(fp->ctx, PR_3_ADJUST_INODE, &pctx); | |
631 | } | |
3839e657 TT |
632 | dirent->inode = fp->parent; |
633 | ||
634 | fp->done++; | |
635 | return DIRENT_ABORT | DIRENT_CHANGED; | |
636 | } | |
637 | ||
86c627ec | 638 | static void fix_dotdot(e2fsck_t ctx, struct dir_info *dir, ext2_ino_t parent) |
3839e657 | 639 | { |
1b6bf175 | 640 | ext2_filsys fs = ctx->fs; |
3839e657 TT |
641 | errcode_t retval; |
642 | struct fix_dotdot_struct fp; | |
1b6bf175 | 643 | struct problem_context pctx; |
3839e657 TT |
644 | |
645 | fp.fs = fs; | |
646 | fp.parent = parent; | |
647 | fp.done = 0; | |
1b6bf175 | 648 | fp.ctx = ctx; |
3839e657 TT |
649 | |
650 | #if 0 | |
f3db3566 | 651 | printf("Fixing '..' of inode %lu to be %lu...\n", dir->ino, parent); |
3839e657 TT |
652 | #endif |
653 | ||
654 | retval = ext2fs_dir_iterate(fs, dir->ino, DIRENT_FLAG_INCLUDE_EMPTY, | |
655 | 0, fix_dotdot_proc, &fp); | |
656 | if (retval || !fp.done) { | |
1b6bf175 TT |
657 | clear_problem_context(&pctx); |
658 | pctx.ino = dir->ino; | |
659 | pctx.errcode = retval; | |
660 | fix_problem(ctx, retval ? PR_3_FIX_PARENT_ERR : | |
661 | PR_3_FIX_PARENT_NOFIND, &pctx); | |
3839e657 TT |
662 | ext2fs_unmark_valid(fs); |
663 | } | |
664 | dir->dotdot = parent; | |
665 | ||
666 | return; | |
667 | } | |
668 | ||
669 | /* | |
670 | * These routines are responsible for expanding a /lost+found if it is | |
671 | * too small. | |
672 | */ | |
673 | ||
674 | struct expand_dir_struct { | |
c1faf9cc TT |
675 | int done; |
676 | int newblocks; | |
677 | errcode_t err; | |
678 | e2fsck_t ctx; | |
3839e657 TT |
679 | }; |
680 | ||
681 | static int expand_dir_proc(ext2_filsys fs, | |
682 | blk_t *blocknr, | |
133a56dc TT |
683 | e2_blkcnt_t blockcnt, |
684 | blk_t ref_block, | |
685 | int ref_offset, | |
54dc7ca2 | 686 | void *priv_data) |
3839e657 | 687 | { |
54dc7ca2 | 688 | struct expand_dir_struct *es = (struct expand_dir_struct *) priv_data; |
3839e657 TT |
689 | blk_t new_blk; |
690 | static blk_t last_blk = 0; | |
691 | char *block; | |
692 | errcode_t retval; | |
1b6bf175 TT |
693 | e2fsck_t ctx; |
694 | ||
695 | ctx = es->ctx; | |
3839e657 TT |
696 | |
697 | if (*blocknr) { | |
698 | last_blk = *blocknr; | |
699 | return 0; | |
700 | } | |
1b6bf175 TT |
701 | retval = ext2fs_new_block(fs, last_blk, ctx->block_found_map, |
702 | &new_blk); | |
3839e657 TT |
703 | if (retval) { |
704 | es->err = retval; | |
705 | return BLOCK_ABORT; | |
706 | } | |
707 | if (blockcnt > 0) { | |
708 | retval = ext2fs_new_dir_block(fs, 0, 0, &block); | |
709 | if (retval) { | |
710 | es->err = retval; | |
711 | return BLOCK_ABORT; | |
712 | } | |
713 | es->done = 1; | |
b8647faa | 714 | retval = ext2fs_write_dir_block(fs, new_blk, block); |
3839e657 | 715 | } else { |
08b21301 TT |
716 | retval = ext2fs_get_mem(fs->blocksize, (void **) &block); |
717 | if (retval) { | |
718 | es->err = retval; | |
3839e657 TT |
719 | return BLOCK_ABORT; |
720 | } | |
721 | memset(block, 0, fs->blocksize); | |
b8647faa | 722 | retval = io_channel_write_blk(fs->io, new_blk, 1, block); |
3839e657 | 723 | } |
3839e657 TT |
724 | if (retval) { |
725 | es->err = retval; | |
726 | return BLOCK_ABORT; | |
727 | } | |
08b21301 | 728 | ext2fs_free_mem((void **) &block); |
3839e657 | 729 | *blocknr = new_blk; |
1b6bf175 | 730 | ext2fs_mark_block_bitmap(ctx->block_found_map, new_blk); |
f3db3566 | 731 | ext2fs_mark_block_bitmap(fs->block_map, new_blk); |
3839e657 | 732 | ext2fs_mark_bb_dirty(fs); |
c1faf9cc TT |
733 | es->newblocks++; |
734 | ||
3839e657 TT |
735 | if (es->done) |
736 | return (BLOCK_CHANGED | BLOCK_ABORT); | |
737 | else | |
738 | return BLOCK_CHANGED; | |
739 | } | |
740 | ||
86c627ec | 741 | static errcode_t expand_directory(e2fsck_t ctx, ext2_ino_t dir) |
3839e657 | 742 | { |
1b6bf175 | 743 | ext2_filsys fs = ctx->fs; |
3839e657 TT |
744 | errcode_t retval; |
745 | struct expand_dir_struct es; | |
746 | struct ext2_inode inode; | |
747 | ||
748 | if (!(fs->flags & EXT2_FLAG_RW)) | |
749 | return EXT2_ET_RO_FILSYS; | |
750 | ||
b8647faa TT |
751 | /* |
752 | * Read the inode and block bitmaps in; we'll be messing with | |
753 | * them. | |
754 | */ | |
755 | e2fsck_read_bitmaps(ctx); | |
c1faf9cc | 756 | |
3839e657 TT |
757 | retval = ext2fs_check_directory(fs, dir); |
758 | if (retval) | |
759 | return retval; | |
760 | ||
761 | es.done = 0; | |
762 | es.err = 0; | |
c1faf9cc | 763 | es.newblocks = 0; |
1b6bf175 | 764 | es.ctx = ctx; |
3839e657 | 765 | |
133a56dc TT |
766 | retval = ext2fs_block_iterate2(fs, dir, BLOCK_FLAG_APPEND, |
767 | 0, expand_dir_proc, &es); | |
3839e657 TT |
768 | |
769 | if (es.err) | |
770 | return es.err; | |
771 | if (!es.done) | |
772 | return EXT2_ET_EXPAND_DIR_ERR; | |
773 | ||
774 | /* | |
775 | * Update the size and block count fields in the inode. | |
776 | */ | |
777 | retval = ext2fs_read_inode(fs, dir, &inode); | |
778 | if (retval) | |
779 | return retval; | |
780 | ||
781 | inode.i_size += fs->blocksize; | |
c1faf9cc | 782 | inode.i_blocks += (fs->blocksize / 512) * es.newblocks; |
3839e657 | 783 | |
08b21301 | 784 | e2fsck_write_inode(ctx, dir, &inode, "expand_directory"); |
3839e657 TT |
785 | |
786 | return 0; | |
787 | } |