1 | /*
|
---|
2 | * block.c --- iterate over all blocks in an inode
|
---|
3 | *
|
---|
4 | * Copyright (C) 1993, 1994, 1995, 1996 Theodore Ts'o.
|
---|
5 | *
|
---|
6 | * %Begin-Header%
|
---|
7 | * This file may be redistributed under the terms of the GNU Public
|
---|
8 | * License.
|
---|
9 | * %End-Header%
|
---|
10 | */
|
---|
11 |
|
---|
12 | #include <stdio.h>
|
---|
13 | #include <string.h>
|
---|
14 | #if HAVE_UNISTD_H
|
---|
15 | #include <unistd.h>
|
---|
16 | #endif
|
---|
17 |
|
---|
18 | #include "ext2_fs.h"
|
---|
19 | #include "ext2fs.h"
|
---|
20 |
|
---|
21 | struct block_context {
|
---|
22 | ext2_filsys fs;
|
---|
23 | int (*func)(ext2_filsys fs,
|
---|
24 | blk_t *blocknr,
|
---|
25 | e2_blkcnt_t bcount,
|
---|
26 | blk_t ref_blk,
|
---|
27 | int ref_offset,
|
---|
28 | void *priv_data);
|
---|
29 | e2_blkcnt_t bcount;
|
---|
30 | int bsize;
|
---|
31 | int flags;
|
---|
32 | errcode_t errcode;
|
---|
33 | char *ind_buf;
|
---|
34 | char *dind_buf;
|
---|
35 | char *tind_buf;
|
---|
36 | void *priv_data;
|
---|
37 | };
|
---|
38 |
|
---|
39 | static int block_iterate_ind(blk_t *ind_block, blk_t ref_block,
|
---|
40 | int ref_offset, struct block_context *ctx)
|
---|
41 | {
|
---|
42 | int ret = 0, changed = 0;
|
---|
43 | int i, flags, limit, offset;
|
---|
44 | blk_t *block_nr;
|
---|
45 |
|
---|
46 | limit = ctx->fs->blocksize >> 2;
|
---|
47 | if (!(ctx->flags & BLOCK_FLAG_DEPTH_TRAVERSE) &&
|
---|
48 | !(ctx->flags & BLOCK_FLAG_DATA_ONLY))
|
---|
49 | ret = (*ctx->func)(ctx->fs, ind_block,
|
---|
50 | BLOCK_COUNT_IND, ref_block,
|
---|
51 | ref_offset, ctx->priv_data);
|
---|
52 | if (!*ind_block || (ret & BLOCK_ABORT)) {
|
---|
53 | ctx->bcount += limit;
|
---|
54 | return ret;
|
---|
55 | }
|
---|
56 | if (*ind_block >= ctx->fs->super->s_blocks_count ||
|
---|
57 | *ind_block < ctx->fs->super->s_first_data_block) {
|
---|
58 | ctx->errcode = EXT2_ET_BAD_IND_BLOCK;
|
---|
59 | ret |= BLOCK_ERROR;
|
---|
60 | return ret;
|
---|
61 | }
|
---|
62 | ctx->errcode = ext2fs_read_ind_block(ctx->fs, *ind_block,
|
---|
63 | ctx->ind_buf);
|
---|
64 | if (ctx->errcode) {
|
---|
65 | ret |= BLOCK_ERROR;
|
---|
66 | return ret;
|
---|
67 | }
|
---|
68 |
|
---|
69 | block_nr = (blk_t *) ctx->ind_buf;
|
---|
70 | offset = 0;
|
---|
71 | if (ctx->flags & BLOCK_FLAG_APPEND) {
|
---|
72 | for (i = 0; i < limit; i++, ctx->bcount++, block_nr++) {
|
---|
73 | flags = (*ctx->func)(ctx->fs, block_nr, ctx->bcount,
|
---|
74 | *ind_block, offset,
|
---|
75 | ctx->priv_data);
|
---|
76 | changed |= flags;
|
---|
77 | if (flags & BLOCK_ABORT) {
|
---|
78 | ret |= BLOCK_ABORT;
|
---|
79 | break;
|
---|
80 | }
|
---|
81 | offset += sizeof(blk_t);
|
---|
82 | }
|
---|
83 | } else {
|
---|
84 | for (i = 0; i < limit; i++, ctx->bcount++, block_nr++) {
|
---|
85 | if (*block_nr == 0)
|
---|
86 | continue;
|
---|
87 | flags = (*ctx->func)(ctx->fs, block_nr, ctx->bcount,
|
---|
88 | *ind_block, offset,
|
---|
89 | ctx->priv_data);
|
---|
90 | changed |= flags;
|
---|
91 | if (flags & BLOCK_ABORT) {
|
---|
92 | ret |= BLOCK_ABORT;
|
---|
93 | break;
|
---|
94 | }
|
---|
95 | offset += sizeof(blk_t);
|
---|
96 | }
|
---|
97 | }
|
---|
98 | if (changed & BLOCK_CHANGED) {
|
---|
99 | ctx->errcode = ext2fs_write_ind_block(ctx->fs, *ind_block,
|
---|
100 | ctx->ind_buf);
|
---|
101 | if (ctx->errcode)
|
---|
102 | ret |= BLOCK_ERROR | BLOCK_ABORT;
|
---|
103 | }
|
---|
104 | if ((ctx->flags & BLOCK_FLAG_DEPTH_TRAVERSE) &&
|
---|
105 | !(ctx->flags & BLOCK_FLAG_DATA_ONLY) &&
|
---|
106 | !(ret & BLOCK_ABORT))
|
---|
107 | ret |= (*ctx->func)(ctx->fs, ind_block,
|
---|
108 | BLOCK_COUNT_IND, ref_block,
|
---|
109 | ref_offset, ctx->priv_data);
|
---|
110 | return ret;
|
---|
111 | }
|
---|
112 |
|
---|
113 | static int block_iterate_dind(blk_t *dind_block, blk_t ref_block,
|
---|
114 | int ref_offset, struct block_context *ctx)
|
---|
115 | {
|
---|
116 | int ret = 0, changed = 0;
|
---|
117 | int i, flags, limit, offset;
|
---|
118 | blk_t *block_nr;
|
---|
119 |
|
---|
120 | limit = ctx->fs->blocksize >> 2;
|
---|
121 | if (!(ctx->flags & (BLOCK_FLAG_DEPTH_TRAVERSE |
|
---|
122 | BLOCK_FLAG_DATA_ONLY)))
|
---|
123 | ret = (*ctx->func)(ctx->fs, dind_block,
|
---|
124 | BLOCK_COUNT_DIND, ref_block,
|
---|
125 | ref_offset, ctx->priv_data);
|
---|
126 | if (!*dind_block || (ret & BLOCK_ABORT)) {
|
---|
127 | ctx->bcount += limit*limit;
|
---|
128 | return ret;
|
---|
129 | }
|
---|
130 | if (*dind_block >= ctx->fs->super->s_blocks_count ||
|
---|
131 | *dind_block < ctx->fs->super->s_first_data_block) {
|
---|
132 | ctx->errcode = EXT2_ET_BAD_DIND_BLOCK;
|
---|
133 | ret |= BLOCK_ERROR;
|
---|
134 | return ret;
|
---|
135 | }
|
---|
136 | ctx->errcode = ext2fs_read_ind_block(ctx->fs, *dind_block,
|
---|
137 | ctx->dind_buf);
|
---|
138 | if (ctx->errcode) {
|
---|
139 | ret |= BLOCK_ERROR;
|
---|
140 | return ret;
|
---|
141 | }
|
---|
142 |
|
---|
143 | block_nr = (blk_t *) ctx->dind_buf;
|
---|
144 | offset = 0;
|
---|
145 | if (ctx->flags & BLOCK_FLAG_APPEND) {
|
---|
146 | for (i = 0; i < limit; i++, block_nr++) {
|
---|
147 | flags = block_iterate_ind(block_nr,
|
---|
148 | *dind_block, offset,
|
---|
149 | ctx);
|
---|
150 | changed |= flags;
|
---|
151 | if (flags & (BLOCK_ABORT | BLOCK_ERROR)) {
|
---|
152 | ret |= flags & (BLOCK_ABORT | BLOCK_ERROR);
|
---|
153 | break;
|
---|
154 | }
|
---|
155 | offset += sizeof(blk_t);
|
---|
156 | }
|
---|
157 | } else {
|
---|
158 | for (i = 0; i < limit; i++, block_nr++) {
|
---|
159 | if (*block_nr == 0) {
|
---|
160 | ctx->bcount += limit;
|
---|
161 | continue;
|
---|
162 | }
|
---|
163 | flags = block_iterate_ind(block_nr,
|
---|
164 | *dind_block, offset,
|
---|
165 | ctx);
|
---|
166 | changed |= flags;
|
---|
167 | if (flags & (BLOCK_ABORT | BLOCK_ERROR)) {
|
---|
168 | ret |= flags & (BLOCK_ABORT | BLOCK_ERROR);
|
---|
169 | break;
|
---|
170 | }
|
---|
171 | offset += sizeof(blk_t);
|
---|
172 | }
|
---|
173 | }
|
---|
174 | if (changed & BLOCK_CHANGED) {
|
---|
175 | ctx->errcode = ext2fs_write_ind_block(ctx->fs, *dind_block,
|
---|
176 | ctx->dind_buf);
|
---|
177 | if (ctx->errcode)
|
---|
178 | ret |= BLOCK_ERROR | BLOCK_ABORT;
|
---|
179 | }
|
---|
180 | if ((ctx->flags & BLOCK_FLAG_DEPTH_TRAVERSE) &&
|
---|
181 | !(ctx->flags & BLOCK_FLAG_DATA_ONLY) &&
|
---|
182 | !(ret & BLOCK_ABORT))
|
---|
183 | ret |= (*ctx->func)(ctx->fs, dind_block,
|
---|
184 | BLOCK_COUNT_DIND, ref_block,
|
---|
185 | ref_offset, ctx->priv_data);
|
---|
186 | return ret;
|
---|
187 | }
|
---|
188 |
|
---|
189 | static int block_iterate_tind(blk_t *tind_block, blk_t ref_block,
|
---|
190 | int ref_offset, struct block_context *ctx)
|
---|
191 | {
|
---|
192 | int ret = 0, changed = 0;
|
---|
193 | int i, flags, limit, offset;
|
---|
194 | blk_t *block_nr;
|
---|
195 |
|
---|
196 | limit = ctx->fs->blocksize >> 2;
|
---|
197 | if (!(ctx->flags & (BLOCK_FLAG_DEPTH_TRAVERSE |
|
---|
198 | BLOCK_FLAG_DATA_ONLY)))
|
---|
199 | ret = (*ctx->func)(ctx->fs, tind_block,
|
---|
200 | BLOCK_COUNT_TIND, ref_block,
|
---|
201 | ref_offset, ctx->priv_data);
|
---|
202 | if (!*tind_block || (ret & BLOCK_ABORT)) {
|
---|
203 | ctx->bcount += limit*limit*limit;
|
---|
204 | return ret;
|
---|
205 | }
|
---|
206 | if (*tind_block >= ctx->fs->super->s_blocks_count ||
|
---|
207 | *tind_block < ctx->fs->super->s_first_data_block) {
|
---|
208 | ctx->errcode = EXT2_ET_BAD_TIND_BLOCK;
|
---|
209 | ret |= BLOCK_ERROR;
|
---|
210 | return ret;
|
---|
211 | }
|
---|
212 | ctx->errcode = ext2fs_read_ind_block(ctx->fs, *tind_block,
|
---|
213 | ctx->tind_buf);
|
---|
214 | if (ctx->errcode) {
|
---|
215 | ret |= BLOCK_ERROR;
|
---|
216 | return ret;
|
---|
217 | }
|
---|
218 |
|
---|
219 | block_nr = (blk_t *) ctx->tind_buf;
|
---|
220 | offset = 0;
|
---|
221 | if (ctx->flags & BLOCK_FLAG_APPEND) {
|
---|
222 | for (i = 0; i < limit; i++, block_nr++) {
|
---|
223 | flags = block_iterate_dind(block_nr,
|
---|
224 | *tind_block,
|
---|
225 | offset, ctx);
|
---|
226 | changed |= flags;
|
---|
227 | if (flags & (BLOCK_ABORT | BLOCK_ERROR)) {
|
---|
228 | ret |= flags & (BLOCK_ABORT | BLOCK_ERROR);
|
---|
229 | break;
|
---|
230 | }
|
---|
231 | offset += sizeof(blk_t);
|
---|
232 | }
|
---|
233 | } else {
|
---|
234 | for (i = 0; i < limit; i++, block_nr++) {
|
---|
235 | if (*block_nr == 0) {
|
---|
236 | ctx->bcount += limit*limit;
|
---|
237 | continue;
|
---|
238 | }
|
---|
239 | flags = block_iterate_dind(block_nr,
|
---|
240 | *tind_block,
|
---|
241 | offset, ctx);
|
---|
242 | changed |= flags;
|
---|
243 | if (flags & (BLOCK_ABORT | BLOCK_ERROR)) {
|
---|
244 | ret |= flags & (BLOCK_ABORT | BLOCK_ERROR);
|
---|
245 | break;
|
---|
246 | }
|
---|
247 | offset += sizeof(blk_t);
|
---|
248 | }
|
---|
249 | }
|
---|
250 | if (changed & BLOCK_CHANGED) {
|
---|
251 | ctx->errcode = ext2fs_write_ind_block(ctx->fs, *tind_block,
|
---|
252 | ctx->tind_buf);
|
---|
253 | if (ctx->errcode)
|
---|
254 | ret |= BLOCK_ERROR | BLOCK_ABORT;
|
---|
255 | }
|
---|
256 | if ((ctx->flags & BLOCK_FLAG_DEPTH_TRAVERSE) &&
|
---|
257 | !(ctx->flags & BLOCK_FLAG_DATA_ONLY) &&
|
---|
258 | !(ret & BLOCK_ABORT))
|
---|
259 | ret |= (*ctx->func)(ctx->fs, tind_block,
|
---|
260 | BLOCK_COUNT_TIND, ref_block,
|
---|
261 | ref_offset, ctx->priv_data);
|
---|
262 |
|
---|
263 | return ret;
|
---|
264 | }
|
---|
265 |
|
---|
266 | errcode_t ext2fs_block_iterate2(ext2_filsys fs,
|
---|
267 | ext2_ino_t ino,
|
---|
268 | int flags,
|
---|
269 | char *block_buf,
|
---|
270 | int (*func)(ext2_filsys fs,
|
---|
271 | blk_t *blocknr,
|
---|
272 | e2_blkcnt_t blockcnt,
|
---|
273 | blk_t ref_blk,
|
---|
274 | int ref_offset,
|
---|
275 | void *priv_data),
|
---|
276 | void *priv_data)
|
---|
277 | {
|
---|
278 | int i;
|
---|
279 | int got_inode = 0;
|
---|
280 | int ret = 0;
|
---|
281 | blk_t blocks[EXT2_N_BLOCKS]; /* directory data blocks */
|
---|
282 | struct ext2_inode inode;
|
---|
283 | errcode_t retval;
|
---|
284 | struct block_context ctx;
|
---|
285 | int limit;
|
---|
286 |
|
---|
287 | EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
|
---|
288 |
|
---|
289 | /*
|
---|
290 | * Check to see if we need to limit large files
|
---|
291 | */
|
---|
292 | if (flags & BLOCK_FLAG_NO_LARGE) {
|
---|
293 | ctx.errcode = ext2fs_read_inode(fs, ino, &inode);
|
---|
294 | if (ctx.errcode)
|
---|
295 | return ctx.errcode;
|
---|
296 | got_inode = 1;
|
---|
297 | if (!LINUX_S_ISDIR(inode.i_mode) &&
|
---|
298 | (inode.i_size_high != 0))
|
---|
299 | return EXT2_ET_FILE_TOO_BIG;
|
---|
300 | }
|
---|
301 |
|
---|
302 | retval = ext2fs_get_blocks(fs, ino, blocks);
|
---|
303 | if (retval)
|
---|
304 | return retval;
|
---|
305 |
|
---|
306 | limit = fs->blocksize >> 2;
|
---|
307 |
|
---|
308 | ctx.fs = fs;
|
---|
309 | ctx.func = func;
|
---|
310 | ctx.priv_data = priv_data;
|
---|
311 | ctx.flags = flags;
|
---|
312 | ctx.bcount = 0;
|
---|
313 | if (block_buf) {
|
---|
314 | ctx.ind_buf = block_buf;
|
---|
315 | } else {
|
---|
316 | retval = ext2fs_get_mem(fs->blocksize * 3, &ctx.ind_buf);
|
---|
317 | if (retval)
|
---|
318 | return retval;
|
---|
319 | }
|
---|
320 | ctx.dind_buf = ctx.ind_buf + fs->blocksize;
|
---|
321 | ctx.tind_buf = ctx.dind_buf + fs->blocksize;
|
---|
322 |
|
---|
323 | /*
|
---|
324 | * Iterate over the HURD translator block (if present)
|
---|
325 | */
|
---|
326 | if ((fs->super->s_creator_os == EXT2_OS_HURD) &&
|
---|
327 | !(flags & BLOCK_FLAG_DATA_ONLY)) {
|
---|
328 | ctx.errcode = ext2fs_read_inode(fs, ino, &inode);
|
---|
329 | if (ctx.errcode)
|
---|
330 | goto abort_exit;
|
---|
331 | got_inode = 1;
|
---|
332 | if (inode.osd1.hurd1.h_i_translator) {
|
---|
333 | ret |= (*ctx.func)(fs,
|
---|
334 | &inode.osd1.hurd1.h_i_translator,
|
---|
335 | BLOCK_COUNT_TRANSLATOR,
|
---|
336 | 0, 0, priv_data);
|
---|
337 | if (ret & BLOCK_ABORT)
|
---|
338 | goto abort_exit;
|
---|
339 | }
|
---|
340 | }
|
---|
341 |
|
---|
342 | /*
|
---|
343 | * Iterate over normal data blocks
|
---|
344 | */
|
---|
345 | for (i = 0; i < EXT2_NDIR_BLOCKS ; i++, ctx.bcount++) {
|
---|
346 | if (blocks[i] || (flags & BLOCK_FLAG_APPEND)) {
|
---|
347 | ret |= (*ctx.func)(fs, &blocks[i],
|
---|
348 | ctx.bcount, 0, i, priv_data);
|
---|
349 | if (ret & BLOCK_ABORT)
|
---|
350 | goto abort_exit;
|
---|
351 | }
|
---|
352 | }
|
---|
353 | if (*(blocks + EXT2_IND_BLOCK) || (flags & BLOCK_FLAG_APPEND)) {
|
---|
354 | ret |= block_iterate_ind(blocks + EXT2_IND_BLOCK,
|
---|
355 | 0, EXT2_IND_BLOCK, &ctx);
|
---|
356 | if (ret & BLOCK_ABORT)
|
---|
357 | goto abort_exit;
|
---|
358 | } else
|
---|
359 | ctx.bcount += limit;
|
---|
360 | if (*(blocks + EXT2_DIND_BLOCK) || (flags & BLOCK_FLAG_APPEND)) {
|
---|
361 | ret |= block_iterate_dind(blocks + EXT2_DIND_BLOCK,
|
---|
362 | 0, EXT2_DIND_BLOCK, &ctx);
|
---|
363 | if (ret & BLOCK_ABORT)
|
---|
364 | goto abort_exit;
|
---|
365 | } else
|
---|
366 | ctx.bcount += limit * limit;
|
---|
367 | if (*(blocks + EXT2_TIND_BLOCK) || (flags & BLOCK_FLAG_APPEND)) {
|
---|
368 | ret |= block_iterate_tind(blocks + EXT2_TIND_BLOCK,
|
---|
369 | 0, EXT2_TIND_BLOCK, &ctx);
|
---|
370 | if (ret & BLOCK_ABORT)
|
---|
371 | goto abort_exit;
|
---|
372 | }
|
---|
373 |
|
---|
374 | abort_exit:
|
---|
375 | if (ret & BLOCK_CHANGED) {
|
---|
376 | if (!got_inode) {
|
---|
377 | retval = ext2fs_read_inode(fs, ino, &inode);
|
---|
378 | if (retval)
|
---|
379 | return retval;
|
---|
380 | }
|
---|
381 | for (i=0; i < EXT2_N_BLOCKS; i++)
|
---|
382 | inode.i_block[i] = blocks[i];
|
---|
383 | retval = ext2fs_write_inode(fs, ino, &inode);
|
---|
384 | if (retval)
|
---|
385 | return retval;
|
---|
386 | }
|
---|
387 |
|
---|
388 | if (!block_buf)
|
---|
389 | ext2fs_free_mem(&ctx.ind_buf);
|
---|
390 |
|
---|
391 | return (ret & BLOCK_ERROR) ? ctx.errcode : 0;
|
---|
392 | }
|
---|
393 |
|
---|
394 | /*
|
---|
395 | * Emulate the old ext2fs_block_iterate function!
|
---|
396 | */
|
---|
397 |
|
---|
398 | struct xlate {
|
---|
399 | int (*func)(ext2_filsys fs,
|
---|
400 | blk_t *blocknr,
|
---|
401 | int bcount,
|
---|
402 | void *priv_data);
|
---|
403 | void *real_private;
|
---|
404 | };
|
---|
405 |
|
---|
406 | #ifdef __TURBOC__
|
---|
407 | # pragma argsused
|
---|
408 | #endif
|
---|
409 | static int xlate_func(ext2_filsys fs, blk_t *blocknr, e2_blkcnt_t blockcnt,
|
---|
410 | blk_t ref_block EXT2FS_ATTR((unused)),
|
---|
411 | int ref_offset EXT2FS_ATTR((unused)),
|
---|
412 | void *priv_data)
|
---|
413 | {
|
---|
414 | struct xlate *xl = (struct xlate *) priv_data;
|
---|
415 |
|
---|
416 | return (*xl->func)(fs, blocknr, (int) blockcnt, xl->real_private);
|
---|
417 | }
|
---|
418 |
|
---|
419 | errcode_t ext2fs_block_iterate(ext2_filsys fs,
|
---|
420 | ext2_ino_t ino,
|
---|
421 | int flags,
|
---|
422 | char *block_buf,
|
---|
423 | int (*func)(ext2_filsys fs,
|
---|
424 | blk_t *blocknr,
|
---|
425 | int blockcnt,
|
---|
426 | void *priv_data),
|
---|
427 | void *priv_data)
|
---|
428 | {
|
---|
429 | struct xlate xl;
|
---|
430 |
|
---|
431 | xl.real_private = priv_data;
|
---|
432 | xl.func = func;
|
---|
433 |
|
---|
434 | return ext2fs_block_iterate2(fs, ino, BLOCK_FLAG_NO_LARGE | flags,
|
---|
435 | block_buf, xlate_func, &xl);
|
---|
436 | }
|
---|
437 |
|
---|