wok-current: 65021c2417fe linux64-cloop/stuff/cloop.u

235 -/* static int uncompress(struct cloop_device *clo, unsigned char *dest, unsigned long *destLen, unsigned char *source, unsigned long sourceLen) */

236 -static int uncompress(struct cloop_device *clo, u_int32_t block_num, u_int32_t compressed_length, unsigned long *uncompressed_length)

237 +static int uncompress(struct cloop_device *clo, unsigned char *dest, unsigned long *destLen, unsigned char *source, unsigned long sourceLen, int flags)

238 {

239 int err = -1;

240 - int flags = CLOOP_BLOCK_FLAGS(clo->block_ptrs[block_num]);

241 switch(flags)

242 {

243 case CLOOP_COMPRESSOR_NONE:

244 - /* block is umcompressed, swap pointers only! */

245 - { char *tmp = clo->compressed_buffer; clo->compressed_buffer = clo->buffer[clo->current_bufnum]; clo->buffer[clo->current_bufnum] = tmp; }

246 - DEBUGP("cloop: block %d is uncompressed (flags=%d), just swapping %u bytes\n", block_num, flags, compressed_length);

247 + memcpy(dest, source, *destLen = sourceLen);

248 + err = Z_OK;

249 break;

250 #if (defined(CONFIG_ZLIB_INFLATE) || defined(CONFIG_ZLIB_INFLATE_MODULE))

251 case CLOOP_COMPRESSOR_ZLIB:

252 - clo->zstream.next_in = clo->compressed_buffer;

253 - clo->zstream.avail_in = compressed_length;

254 - clo->zstream.next_out = clo->buffer[clo->current_bufnum];

255 - clo->zstream.avail_out = clo->head.block_size;

256 + clo->zstream.next_in = source;

257 + clo->zstream.avail_in = sourceLen;

258 + clo->zstream.next_out = dest;

259 + clo->zstream.avail_out = *destLen;

260 err = zlib_inflateReset(&clo->zstream);

261 if (err != Z_OK)

262 {

263 @@ -239,50 +234,50 @@

264 zlib_inflateEnd(&clo->zstream); zlib_inflateInit(&clo->zstream);

265 }

266 err = zlib_inflate(&clo->zstream, Z_FINISH);

267 - *uncompressed_length = clo->zstream.total_out;

268 + *destLen = clo->zstream.total_out;

269 if (err == Z_STREAM_END) err = 0;

270 - DEBUGP("cloop: zlib decompression done, ret =%d, size =%lu\n", err, *uncompressed_length);

271 + DEBUGP("cloop: zlib decompression done, ret =%d, size =%lu\n", err, *destLen);

272 break;

273 #endif

274 #if (defined(CONFIG_LZO_DECOMPRESS) || defined(CONFIG_LZO_DECOMPRESS_MODULE))

275 case CLOOP_COMPRESSOR_LZO1X:

276 {

277 size_t tmp = (size_t) clo->head.block_size;

278 - err = lzo1x_decompress_safe(clo->compressed_buffer, compressed_length,

279 - clo->buffer[clo->current_bufnum], &tmp);

280 - if (err == LZO_E_OK) *uncompressed_length = (u_int32_t) tmp;

281 + err = lzo1x_decompress_safe(source, sourceLen,

282 + dest, &tmp);

283 + if (err == LZO_E_OK) *destLen = (u_int32_t) tmp;

284 }

285 break;

286 #endif

287 #if (defined(CONFIG_DECOMPRESS_LZ4) || defined(CONFIG_DECOMPRESS_LZ4_MODULE))

288 case CLOOP_COMPRESSOR_LZ4:

289 {

290 - size_t outputSize = clo->head.block_size;

291 + size_t outputSize = *destLen;

292 /* We should adjust outputSize here, in case the last block is smaller than block_size */

293 #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 11, 0) /* field removed */

294 - err = lz4_decompress(clo->compressed_buffer, (size_t *) &compressed_length,

295 - clo->buffer[clo->current_bufnum], outputSize);

296 + err = lz4_decompress(source, (size_t *) &sourceLen,

297 + dest, outputSize);

298 #else

299 - err = LZ4_decompress_safe(clo->compressed_buffer,

300 - clo->buffer[clo->current_bufnum],

301 - compressed_length, outputSize);

302 + err = LZ4_decompress_safe(source,

303 + dest,

304 + sourceLen, outputSize);

305 #endif

306 if (err >= 0)

307 {

308 err = 0;

309 - *uncompressed_length = outputSize;

310 + *destLen = outputSize;

311 }

312 }

313 break;

314 #endif

315 #if (defined(CONFIG_DECOMPRESS_XZ) || defined(CONFIG_DECOMPRESS_XZ_MODULE))

316 case CLOOP_COMPRESSOR_XZ:

317 - clo->xz_buffer.in = clo->compressed_buffer;

318 + clo->xz_buffer.in = source;

319 clo->xz_buffer.in_pos = 0;

320 - clo->xz_buffer.in_size = compressed_length;

321 - clo->xz_buffer.out = clo->buffer[clo->current_bufnum];

322 + clo->xz_buffer.in_size = sourceLen;

323 + clo->xz_buffer.out = dest;

324 clo->xz_buffer.out_pos = 0;

325 - clo->xz_buffer.out_size = clo->head.block_size;

326 + clo->xz_buffer.out_size = *destLen;

327 xz_dec_reset(clo->xzdecoderstate);

328 err = xz_dec_run(clo->xzdecoderstate, &clo->xz_buffer);

329 if (err == XZ_STREAM_END || err == XZ_OK)

330 @@ -309,16 +304,12 @@

331 while (buf_done < buf_len)

332 {

333 size_t size = buf_len - buf_done, size_read;

334 - mm_segment_t old_fs;

335 /* kernel_read() only supports 32 bit offsets, so we use vfs_read() instead. */

336 /* int size_read = kernel_read(f, pos, buf + buf_done, size); */

337 -

338 - // mutex_lock(&clo->clo_rq_mutex);

339 - old_fs = get_fs();

340 - set_fs(KERNEL_DS);

341 + mm_segment_t old_fs = get_fs();

342 + set_fs(get_ds());

343 size_read = vfs_read(f, (void __user *)(buf + buf_done), size, &pos);

344 set_fs(old_fs);

345 - // mutex_unlock(&clo->clo_rq_mutex);

346

347 if(size_read <= 0)

348 {

349 @@ -358,8 +349,8 @@

350 return i;

351 }

352

353 - compressed_block_offset = CLOOP_BLOCK_OFFSET(clo->block_ptrs[blocknum]);

354 - compressed_block_len = (long) (CLOOP_BLOCK_OFFSET(clo->block_ptrs[blocknum+1]) - compressed_block_offset) ;

355 + compressed_block_offset = clo->block_ptrs[blocknum].offset;

356 + compressed_block_len = (long) (clo->block_ptrs[blocknum].size) ;

357

358 /* Load one compressed block from the file. */

359 if(compressed_block_offset > 0 && compressed_block_len >= 0) /* sanity check */

360 @@ -369,12 +360,12 @@

361 if (n!= compressed_block_len)

362 {

363 printk(KERN_ERR "%s: error while reading %lu bytes @ %llu from file %s\n",

364 - cloop_name, compressed_block_len, clo->block_ptrs[blocknum], clo->underlying_filename);

365 + cloop_name, compressed_block_len, clo->block_ptrs[blocknum].offset, clo->underlying_filename);

366 /* return -1; */

367 }

368 } else {

369 printk(KERN_ERR "%s: invalid data block len %ld bytes @ %lld from file %s\n",

370 - cloop_name, compressed_block_len, clo->block_ptrs[blocknum], clo->underlying_filename);

371 + cloop_name, compressed_block_len, clo->block_ptrs[blocknum].offset, clo->underlying_filename);

372 return -1;

373 }

374

375 @@ -382,14 +373,16 @@

376 if(++clo->current_bufnum >= clo->num_buffered_blocks) clo->current_bufnum = 0;

377

378 /* Do the uncompression */

379 - ret = uncompress(clo, blocknum, compressed_block_len, &uncompressed_block_len);

380 + uncompressed_block_len = clo->head.block_size;

381 + ret = uncompress(clo, clo->buffer[clo->current_bufnum], &uncompressed_block_len,

382 + clo->compressed_buffer, compressed_block_len, clo->block_ptrs[blocknum].flags);

383 /* DEBUGP("cloop: buflen after uncompress: %ld\n",buflen); */

384 if (ret != 0)

385 {

386 printk(KERN_ERR "%s: decompression error %i uncompressing block %u %lu bytes @ %llu, flags %u\n",

387 cloop_name, ret, blocknum,

388 - compressed_block_len, CLOOP_BLOCK_OFFSET(clo->block_ptrs[blocknum]),

389 - CLOOP_BLOCK_FLAGS(clo->block_ptrs[blocknum]));

390 + compressed_block_len, clo->block_ptrs[blocknum].offset,

391 + clo->block_ptrs[blocknum].flags);

392 clo->buffered_blocknum[clo->current_bufnum] = -1;

393 return -1;

394 }

395 @@ -397,107 +390,146 @@

396 return clo->current_bufnum;

397 }

398

399 -static blk_status_t cloop_handle_request(struct cloop_device *clo, struct request *req)

400 +/* This function does all the real work. */

401 +/* returns "uptodate" */

402 +static int cloop_handle_request(struct cloop_device *clo, struct request *req)

403 {

404 int buffered_blocknum = -1;

405 int preloaded = 0;

406 - loff_t offset = (loff_t) blk_rq_pos(req)<<9;

407 + loff_t offset = (loff_t) blk_rq_pos(req)<<9; /* req->sector<<9 */

408 struct bio_vec bvec;

409 struct req_iterator iter;

410 - blk_status_t ret = BLK_STS_OK;

411 -

412 - if (unlikely(req_op(req) != REQ_OP_READ ))

413 - {

414 - blk_dump_rq_flags(req, DEVICE_NAME " bad request");

415 - return BLK_STS_IOERR;

416 - }

417 -

418 - if (unlikely(!clo->backing_file && !clo->suspended))

419 - {

420 - DEBUGP("cloop_handle_request: not connected to a file\n");

421 - return BLK_STS_IOERR;

422 - }

423 -

424 rq_for_each_segment(bvec, req, iter)

425 - {

426 - unsigned long len = bvec.bv_len;

427 - loff_t to_offset = bvec.bv_offset;

428 -

429 - while(len > 0)

430 {

431 - u_int32_t length_in_buffer;

432 - loff_t block_offset = offset;

433 - u_int32_t offset_in_buffer;

434 - char *from_ptr, *to_ptr;

435 - /* do_div (div64.h) returns the 64bit division remainder and */

436 - /* puts the result in the first argument, i.e. block_offset */

437 - /* becomes the blocknumber to load, and offset_in_buffer the */

438 - /* position in the buffer */

439 - offset_in_buffer = do_div(block_offset, clo->head.block_size);

440 - /* Lookup preload cache */

441 - if(block_offset < clo->preload_size && clo->preload_cache != NULL && clo->preload_cache[block_offset] != NULL)

442 - { /* Copy from cache */

443 - preloaded = 1;

444 - from_ptr = clo->preload_cache[block_offset];

445 - }

446 - else

447 - {

448 - preloaded = 0;

449 - buffered_blocknum = cloop_load_buffer(clo,block_offset);

450 - if(buffered_blocknum == -1)

451 + unsigned long len = bvec.bv_len;

452 + char *to_ptr = kmap(bvec.bv_page) + bvec.bv_offset;

453 + while(len > 0)

454 {

455 - ret = BLK_STS_IOERR;

456 - break; /* invalid data, leave inner loop */

457 + u_int32_t length_in_buffer;

458 + loff_t block_offset = offset;

459 + u_int32_t offset_in_buffer;

460 + char *from_ptr;

461 + /* do_div (div64.h) returns the 64bit division remainder and */

462 + /* puts the result in the first argument, i.e. block_offset */

463 + /* becomes the blocknumber to load, and offset_in_buffer the */

464 + /* position in the buffer */

465 + offset_in_buffer = do_div(block_offset, clo->head.block_size);

466 + /* Lookup preload cache */

467 + if(block_offset < clo->preload_size && clo->preload_cache != NULL &&

468 + clo->preload_cache[block_offset] != NULL)

469 + { /* Copy from cache */

470 + preloaded = 1;

471 + from_ptr = clo->preload_cache[block_offset];

472 + }

473 + else

474 + {

475 + preloaded = 0;

476 + buffered_blocknum = cloop_load_buffer(clo,block_offset);

477 + if(buffered_blocknum == -1) break; /* invalid data, leave inner loop */

478 + /* Copy from buffer */

479 + from_ptr = clo->buffer[buffered_blocknum];

480 + }

481 + /* Now, at least part of what we want will be in the buffer. */

482 + length_in_buffer = clo->head.block_size - offset_in_buffer;

483 + if(length_in_buffer > len)

484 + {

485 +/* DEBUGP("Warning: length_in_buffer=%u > len=%u\n",

486 + length_in_buffer,len); */

487 + length_in_buffer = len;

488 + }

489 + memcpy(to_ptr, from_ptr + offset_in_buffer, length_in_buffer);

490 + to_ptr += length_in_buffer;

491 + len -= length_in_buffer;

492 + offset += length_in_buffer;

493 + } /* while inner loop */

494 + kunmap(bvec.bv_page);

495 + cond_resched();

496 + } /* end rq_for_each_segment*/

497 + return ((buffered_blocknum!=-1) || preloaded);

498 +}

499 +

500 +/* Adopted from loop.c, a kernel thread to handle physical reads and

501 + decompression. */

502 +static int cloop_thread(void *data)

503 +{

504 + struct cloop_device *clo = data;

505 + current->flags |= PF_NOFREEZE;

506 + set_user_nice(current, 10);

507 + while (!kthread_should_stop()||!list_empty(&clo->clo_list))

508 + {

509 + int err;

510 + err = wait_event_interruptible(clo->clo_event, !list_empty(&clo->clo_list) ||

511 + kthread_should_stop());

512 + if(unlikely(err))

513 + {

514 + DEBUGP(KERN_ERR "cloop thread activated on error!? Continuing.\n");

515 + continue;

516 }

517 - /* Copy from buffer */

518 - from_ptr = clo->buffer[buffered_blocknum];

519 - }

520 - /* Now, at least part of what we want will be in the buffer. */

521 - length_in_buffer = clo->head.block_size - offset_in_buffer;

522 - if(length_in_buffer > len)

523 - {

524 - /* DEBUGP("Warning: length_in_buffer=%u > len=%u\n", length_in_buffer,len); */

525 - length_in_buffer = len;

526 - }

527 - to_ptr = kmap_atomic(bvec.bv_page);

528 - memcpy(to_ptr + to_offset, from_ptr + offset_in_buffer, length_in_buffer);

529 - kunmap_atomic(to_ptr);

530 - to_offset += length_in_buffer;

531 - len -= length_in_buffer;

532 - offset += length_in_buffer;

533 - } /* while inner loop */

534 - } /* rq_for_each_segment */

535 - return ret;

536 -}

537 -

538 -static blk_status_t cloop_queue_rq(struct blk_mq_hw_ctx *hctx, const struct blk_mq_queue_data *bd)

539 -{

540 -// struct request_queue *q = hctx->queue;

541 -// struct cloop_device *clo = q->queuedata;

542 - struct request *req = bd->rq;

543 - struct cloop_device *clo = req->rq_disk->private_data;

544 - blk_status_t ret = BLK_STS_OK;

545 -

546 -#if 1 /* Does it work when loading libraries? */

547 - /* Since we have a buffered block list as well as data to read */

548 - /* from disk (slow), and are (probably) never called from an */

549 - /* interrupt, we use a simple mutex lock right here to ensure */

550 - /* consistency. */

551 - mutex_lock(&clo->clo_rq_mutex);

552 - #else

553 - spin_lock_irq(&clo->queue_lock);

554 - #endif

555 - blk_mq_start_request(req);

556 - do {

557 - ret = cloop_handle_request(clo, req);

558 - } while(blk_update_request(req, ret, blk_rq_cur_bytes(req)));

559 - blk_mq_end_request(req, ret);

560 - #if 1 /* See above */

561 - mutex_unlock(&clo->clo_rq_mutex);

562 - #else

563 - spin_unlock_irq(&clo->queue_lock);

564 - #endif

565 - return ret;

566 + if(!list_empty(&clo->clo_list))

567 + {

568 + struct request *req;

569 + unsigned long flags;

570 + int uptodate;

571 + spin_lock_irq(&clo->queue_lock);

572 + req = list_entry(clo->clo_list.next, struct request, queuelist);

573 + list_del_init(&req->queuelist);

574 + spin_unlock_irq(&clo->queue_lock);

575 + uptodate = cloop_handle_request(clo, req);

576 + spin_lock_irqsave(&clo->queue_lock, flags);

577 + __blk_end_request_all(req, uptodate ? 0 : -EIO);

578 + spin_unlock_irqrestore(&clo->queue_lock, flags);

579 + }

580 + }

581 + DEBUGP(KERN_ERR "cloop_thread exited.\n");

582 + return 0;

583 +}

584 +

585 +/* This is called by the kernel block queue management every now and then,

586 + * with successive read requests qeued and sorted in a (hopefully)

587 + * "most efficient way". spin_lock_irq() is being held by the kernel. */

588 +static void cloop_do_request(struct request_queue *q)

589 +{

590 + struct request *req;

591 + while((req = blk_fetch_request(q)) != NULL)

592 + {

593 + struct cloop_device *clo;

594 + int rw;

595 + /* quick sanity checks */

596 + /* blk_fs_request() was removed in 2.6.36 */

597 + if (unlikely(req == NULL

598 +#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 11, 0) /* field removed */

599 + || (req->cmd_type != REQ_TYPE_FS)

600 +#endif

601 + ))

602 + goto error_continue;

603 + rw = rq_data_dir(req);

604 + if (unlikely(rw != READ

605 +#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 8, 0)

606 + && rw != READA

607 +#endif

608 + ))

609 + {

610 + DEBUGP("cloop_do_request: bad command\n");

611 + goto error_continue;

612 + }

613 + clo = req->rq_disk->private_data;

614 + if (unlikely(!clo->backing_file && !clo->suspended))

615 + {

616 + DEBUGP("cloop_do_request: not connected to a file\n");

617 + goto error_continue;

618 + }

619 + list_add_tail(&req->queuelist, &clo->clo_list); /* Add to working list for thread */

620 + wake_up(&clo->clo_event); /* Wake up cloop_thread */

621 + continue; /* next request */

622 + error_continue:

623 + DEBUGP(KERN_ERR "cloop_do_request: Discarding request %p.\n", req);

624 +#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 12, 0)

625 + req->errors++;

626 +#else

627 + req->error_count++;

628 +#endif

629 + __blk_end_request_all(req, -EIO);

630 + }

631 }

632

633 /* Read header, flags and offsets from already opened file */

634 @@ -508,7 +540,7 @@

635 char *bbuf=NULL;

636 unsigned int bbuf_size = 0;

637 const unsigned int header_size = sizeof(struct cloop_head);

638 - unsigned int i, offsets_read=0, total_offsets=0;

639 + unsigned int i, total_offsets=0;

640 loff_t fs_read_position = 0, header_pos[2];

641 int isblkdev, bytes_read, error = 0;

642 if (clo->suspended) return error;

643 @@ -581,29 +613,19 @@

644 goto error_release;

645 }

646 memcpy(&clo->head, bbuf, header_size);

647 - if (strncmp(bbuf+CLOOP4_SIGNATURE_OFFSET, CLOOP4_SIGNATURE, CLOOP4_SIGNATURE_SIZE)==0)

648 + if (strncmp(bbuf+CLOOP_SIGNATURE_OFFSET, CLOOP_SIGNATURE, CLOOP_SIGNATURE_SIZE)==0)

649 {

650 - clo->file_format=4;

651 + clo->file_format++;

652 clo->head.block_size=ntohl(clo->head.block_size);

653 clo->head.num_blocks=ntohl(clo->head.num_blocks);

654 clo->header_first = (i==0) ? 1 : 0;

655 - printk(KERN_INFO "%s: file %s version %d, %d blocks of %d bytes, header %s.\n", cloop_name, clo->underlying_filename, clo->file_format, clo->head.num_blocks, clo->head.block_size, (i==0)?"first":"last");

656 - break;

657 - }

658 - else if (strncmp(bbuf+CLOOP2_SIGNATURE_OFFSET, CLOOP2_SIGNATURE, CLOOP2_SIGNATURE_SIZE)==0)

659 - {

660 - clo->file_format=2;

661 - clo->head.block_size=ntohl(clo->head.block_size);

662 - clo->head.num_blocks=ntohl(clo->head.num_blocks);

663 - clo->header_first = (i==0) ? 1 : 0;

664 - printk(KERN_INFO "%s: file %s version %d, %d blocks of %d bytes, header %s.\n", cloop_name, clo->underlying_filename, clo->file_format, clo->head.num_blocks, clo->head.block_size, (i==0)?"first":"last");

665 + printk(KERN_INFO "%s: file %s, %d blocks of %d bytes, header %s.\n", cloop_name, clo->underlying_filename, clo->head.num_blocks, clo->head.block_size, (i==0)?"first":"last");

666 break;

667 }

668 }

669 if (clo->file_format == 0)

670 {

671 - printk(KERN_ERR "%s: Cannot read old 32-bit (version 0.68) images, "

672 - "please use an older version of %s for this file.\n",

673 + printk(KERN_ERR "%s: Cannot detect %s format.\n",

674 cloop_name, cloop_name);

675 error=-EBADF; goto error_release;

676 }

677 @@ -613,67 +635,133 @@

678 cloop_name, clo->head.block_size);

679 error=-EBADF; goto error_release;

680 }

681 - total_offsets=clo->head.num_blocks+1;

682 - if (!isblkdev && (sizeof(struct cloop_head)+sizeof(loff_t)*

683 + total_offsets=clo->head.num_blocks;

684 + if (!isblkdev && (sizeof(struct cloop_head)+sizeof(struct block_info)*

685 total_offsets > inode->i_size))

686 {

687 printk(KERN_ERR "%s: file %s too small for %u blocks\n",

688 cloop_name, clo->underlying_filename, clo->head.num_blocks);

689 error=-EBADF; goto error_release;

690 }

691 - clo->block_ptrs = cloop_malloc(sizeof(cloop_block_ptr) * total_offsets);

692 - if (!clo->block_ptrs)

693 + /* Allocate Memory for decompressors */

694 +#if (defined(CONFIG_ZLIB_INFLATE) || defined(CONFIG_ZLIB_INFLATE_MODULE))

695 + clo->zstream.workspace = cloop_malloc(zlib_inflate_workspacesize());

696 + if(!clo->zstream.workspace)

697 {

698 - printk(KERN_ERR "%s: out of kernel mem for offsets\n", cloop_name);

699 + printk(KERN_ERR "%s: out of mem for zlib working area %u\n",

700 + cloop_name, zlib_inflate_workspacesize());

701 error=-ENOMEM; goto error_release;

702 }

703 - /* Read them offsets! */

704 - if(clo->header_first)

705 + zlib_inflateInit(&clo->zstream);

706 +#endif

707 +#if (defined(CONFIG_DECOMPRESS_XZ) || defined(CONFIG_DECOMPRESS_XZ_MODULE))

708 +#if XZ_INTERNAL_CRC32

709 + /* This must be called before any other xz_* function to initialize the CRC32 lookup table. */

710 + xz_crc32_init(void);

711 +#endif

712 + clo->xzdecoderstate = xz_dec_init(XZ_SINGLE, 0);

713 +#endif

714 + if (total_offsets + 1 == 0) /* Version 3 */

715 {

716 - fs_read_position = sizeof(struct cloop_head);

717 + struct cloop_tail tail;

718 + if (isblkdev)

719 + {

720 + /* No end of file: can't find index */

721 + printk(KERN_ERR "%s: no V3 support for block device\n",

722 + cloop_name);

723 + error=-EBADF; goto error_release;

724 + }

725 + bytes_read = cloop_read_from_file(clo, file, (void *) &tail,

726 + inode->i_size - sizeof(struct cloop_tail),

727 + sizeof(struct cloop_tail));

728 + if (bytes_read == sizeof(struct cloop_tail))

729 + {

730 + unsigned long len, zlen;

731 + int ret;

732 + void *zbuf;

733 + clo->head.num_blocks = ntohl(tail.num_blocks);

734 + total_offsets = clo->head.num_blocks;

735 + clo->block_ptrs = cloop_malloc(sizeof(struct block_info) * total_offsets);

736 + zlen = ntohl(tail.table_size);

737 + zbuf = cloop_malloc(zlen);

738 + if (!clo->block_ptrs || !zbuf)

739 + {

740 + printk(KERN_ERR "%s: out of kernel mem for index\n", cloop_name);

741 + error=-ENOMEM; goto error_release;

742 + }

743 + bytes_read = cloop_read_from_file(clo, file, zbuf,

744 + inode->i_size - zlen - sizeof(struct cloop_tail),

745 + zlen);

746 + if (bytes_read != zlen)

747 + {

748 + printk(KERN_ERR "%s: can't read index\n", cloop_name);

749 + error=-EBADF; goto error_release;

750 + }

751 + len = CLOOP3_INDEX_SIZE(ntohl(tail.index_size)) * total_offsets;

752 + ret = uncompress(clo, (void *) clo->block_ptrs, &len, zbuf, zlen, CLOOP_COMPRESSOR_ZLIB);

753 + cloop_free(zbuf, zlen);

754 + if (ret != 0)

755 + {

756 + printk(KERN_ERR "%s: decompression error %i uncompressing index\n",

757 + cloop_name, ret);

758 + error=-EBADF; goto error_release;

759 + }

760 + }

761 + else

762 + {

763 + printk(KERN_ERR "%s: can't find index\n", cloop_name);

764 + error=-ENOMEM; goto error_release;

765 + }

766 }

767 else

768 {

769 - fs_read_position = clo->underlying_total_size - sizeof(struct cloop_head) - total_offsets * sizeof(loff_t);

770 - }

771 - for(offsets_read=0;offsets_read<total_offsets;)

772 - {

773 - size_t bytes_readable;

774 - unsigned int num_readable, offset = 0;

775 - bytes_readable = MIN(bbuf_size, clo->underlying_total_size - fs_read_position);

776 - if(bytes_readable <= 0) break; /* Done */

777 - bytes_read = cloop_read_from_file(clo, file, bbuf, fs_read_position, bytes_readable);

778 - if(bytes_read != bytes_readable)

779 + unsigned int n, total_bytes;

780 + clo->block_ptrs = cloop_malloc(sizeof(struct block_info) * total_offsets);

781 + if (!clo->block_ptrs)

782 + {

783 + printk(KERN_ERR "%s: out of kernel mem for offsets\n", cloop_name);

784 + error=-ENOMEM; goto error_release;

785 + }

786 + /* Read them offsets! */

787 + if(clo->header_first)

788 {

789 - printk(KERN_ERR "%s: Bad file %s, read() %lu bytes @ %llu returned %d.\n",

790 - cloop_name, clo->underlying_filename, (unsigned long)clo->underlying_blksize, fs_read_position, (int)bytes_read);

791 - error=-EBADF;

792 - goto error_release;

793 + total_bytes = total_offsets * sizeof(struct block_info);

794 + fs_read_position = sizeof(struct cloop_head);

795 }

796 - /* remember where to read the next blk from file */

797 - fs_read_position += bytes_read;

798 - /* calculate how many offsets can be taken from current bbuf */

799 - num_readable = MIN(total_offsets - offsets_read,

800 - bytes_read / sizeof(loff_t));

801 - DEBUGP(KERN_INFO "cloop: parsing %d offsets %d to %d\n", num_readable, offsets_read, offsets_read+num_readable-1);

802 - for (i=0,offset=0; i<num_readable; i++)

803 + else

804 {

805 - loff_t tmp = be64_to_cpu( *(loff_t*) (bbuf+offset) );

806 - if (i%50==0) DEBUGP(KERN_INFO "cloop: offset %03d: %llu\n", offsets_read, tmp);

807 - if(offsets_read > 0)

808 + total_bytes = total_offsets * sizeof(loff_t);

809 + fs_read_position = clo->underlying_total_size - sizeof(struct cloop_head) - total_bytes;

810 + }

811 + for(n=0;n<total_bytes;)

812 + {

813 + size_t bytes_readable;

814 + bytes_readable = MIN(bbuf_size, clo->underlying_total_size - fs_read_position);

815 + if(bytes_readable <= 0) break; /* Done */

816 + bytes_read = cloop_read_from_file(clo, file, bbuf, fs_read_position, bytes_readable);

817 + if(bytes_read != bytes_readable)

818 {

819 - loff_t d = CLOOP_BLOCK_OFFSET(tmp) - CLOOP_BLOCK_OFFSET(clo->block_ptrs[offsets_read-1]);

820 - if(d > clo->largest_block) clo->largest_block = d;

821 + printk(KERN_ERR "%s: Bad file %s, read() %lu bytes @ %llu returned %d.\n",

822 + cloop_name, clo->underlying_filename, (unsigned long)clo->underlying_blksize, fs_read_position, (int)bytes_read);

823 + error=-EBADF;

824 + goto error_release;

825 }

826 - clo->block_ptrs[offsets_read++] = tmp;

827 - offset += sizeof(loff_t);

828 + memcpy(((char *)clo->block_ptrs) + n, bbuf, bytes_read);

829 + /* remember where to read the next blk from file */

830 + fs_read_position += bytes_read;

831 + n += bytes_read;

832 }

833 }

834 - printk(KERN_INFO "%s: %s: %u blocks, %u bytes/block, largest block is %lu bytes.\n",

835 - cloop_name, clo->underlying_filename, clo->head.num_blocks,

836 - clo->head.block_size, clo->largest_block);

837 {

838 int i;

839 + char *version = build_index(clo->block_ptrs, clo->head.num_blocks, clo->head.block_size);

840 + clo->largest_block = 0;

841 + for (i = 0; i < clo->head.num_blocks; i++)

842 + if (clo->block_ptrs[i].size > clo->largest_block)

843 + clo->largest_block = clo->block_ptrs[i].size;

844 + printk(KERN_INFO "%s: %s: %s: %u blocks, %u bytes/block, largest block is %lu bytes.\n",

845 + cloop_name, clo->underlying_filename, version, clo->head.num_blocks,

846 + clo->head.block_size, clo->largest_block);

847 clo->num_buffered_blocks = (buffers > 0 && clo->head.block_size >= 512) ?

848 (buffers / clo->head.block_size) : 1;

849 clo->buffered_blocknum = cloop_malloc(clo->num_buffered_blocks * sizeof (u_int32_t));

850 @@ -705,36 +793,14 @@

851 cloop_name, clo->largest_block);

852 error=-ENOMEM; goto error_release_free_buffer;

853 }

854 - /* Allocate Memory for decompressors */

855 -#if (defined(CONFIG_ZLIB_INFLATE) || defined(CONFIG_ZLIB_INFLATE_MODULE))

856 - clo->zstream.workspace = cloop_malloc(zlib_inflate_workspacesize());

857 - if(!clo->zstream.workspace)

858 - {

859 - printk(KERN_ERR "%s: out of mem for zlib working area %u\n",

860 - cloop_name, zlib_inflate_workspacesize());

861 - error=-ENOMEM; goto error_release_free_all;

862 - }

863 - zlib_inflateInit(&clo->zstream);

864 -#endif

865 -#if (defined(CONFIG_DECOMPRESS_XZ) || defined(CONFIG_DECOMPRESS_XZ_MODULE))

866 -#if XZ_INTERNAL_CRC32

867 - /* This must be called before any other xz_* function to initialize the CRC32 lookup table. */

868 - xz_crc32_init(void);

869 -#endif

870 - clo->xzdecoderstate = xz_dec_init(XZ_SINGLE, 0);

871 -#endif

872 - if(CLOOP_BLOCK_OFFSET(clo->block_ptrs[clo->head.num_blocks]) > clo->underlying_total_size)

873 + set_capacity(clo->clo_disk, (sector_t)(clo->head.num_blocks*(clo->head.block_size>>9)));

874 + clo->clo_thread = kthread_create(cloop_thread, clo, "cloop%d", cloop_num);

875 + if(IS_ERR(clo->clo_thread))

876 {

877 - printk(KERN_ERR "%s: final offset wrong (%llu > %llu)\n",

878 - cloop_name,

879 - CLOOP_BLOCK_OFFSET(clo->block_ptrs[clo->head.num_blocks]),

880 - clo->underlying_total_size);

881 -#if (defined(CONFIG_ZLIB_INFLATE) || defined(CONFIG_ZLIB_INFLATE_MODULE))

882 - cloop_free(clo->zstream.workspace, zlib_inflate_workspacesize()); clo->zstream.workspace=NULL;

883 -#endif

884 + error = PTR_ERR(clo->clo_thread);

885 + clo->clo_thread=NULL;

886 goto error_release_free_all;

887 }

888 - set_capacity(clo->clo_disk, (sector_t)(clo->head.num_blocks*(clo->head.block_size>>9)));

889 if(preload > 0)

890 {

891 clo->preload_array_size = ((preload<=clo->head.num_blocks)?preload:clo->head.num_blocks);

892 @@ -780,6 +846,7 @@

893 clo->preload_array_size = clo->preload_size = 0;

894 }

895 }

896 + wake_up_process(clo->clo_thread);

897 /* Uncheck */

898 return error;

899 error_release_free_all:

900 @@ -794,9 +861,13 @@

901 }

902 if (clo->buffered_blocknum) { cloop_free(clo->buffered_blocknum, sizeof(int)*clo->num_buffered_blocks); clo->buffered_blocknum=NULL; }

903 error_release_free:

904 - cloop_free(clo->block_ptrs, sizeof(cloop_block_ptr) * total_offsets);

905 + cloop_free(clo->block_ptrs, sizeof(struct block_info) * total_offsets);

906 clo->block_ptrs=NULL;

907 error_release:

908 +#if (defined(CONFIG_ZLIB_INFLATE) || defined(CONFIG_ZLIB_INFLATE_MODULE))

909 + zlib_inflateEnd(&clo->zstream);

910 + if(clo->zstream.workspace) { cloop_free(clo->zstream.workspace, zlib_inflate_workspacesize()); clo->zstream.workspace = NULL; }

911 +#endif

912 if(bbuf) cloop_free(bbuf, clo->underlying_blksize);

913 if(clo->underlying_filename) { kfree(clo->underlying_filename); clo->underlying_filename=NULL; }

914 clo->backing_file=NULL;

915 @@ -829,6 +900,7 @@

916 if(clo->refcnt > 1) /* we needed one fd for the ioctl */

917 return -EBUSY;

918 if(filp==NULL) return -EINVAL;

919 + if(clo->clo_thread) { kthread_stop(clo->clo_thread); clo->clo_thread=NULL; }

920 if(filp!=initial_file)

921 fput(filp);

922 else

923 @@ -839,7 +911,7 @@

924 clo->backing_file = NULL;

925 clo->backing_inode = NULL;

926 if(clo->underlying_filename) { kfree(clo->underlying_filename); clo->underlying_filename=NULL; }

927 - if(clo->block_ptrs) { cloop_free(clo->block_ptrs, clo->head.num_blocks+1); clo->block_ptrs = NULL; }

928 + if(clo->block_ptrs) { cloop_free(clo->block_ptrs, clo->head.num_blocks); clo->block_ptrs = NULL; }

929 if(clo->preload_cache)

930 {

931 int i;

932 @@ -1054,15 +1126,15 @@

933 case LOOP_CLR_FD: /* Change arg */

934 case LOOP_GET_STATUS64: /* Change arg */

935 case LOOP_SET_STATUS64: /* Change arg */

936 - return cloop_ioctl(bdev, mode, cmd, (unsigned long) compat_ptr(arg));

937 + arg = (unsigned long) compat_ptr(arg);

938 case LOOP_SET_STATUS: /* unchanged */

939 case LOOP_GET_STATUS: /* unchanged */

940 case LOOP_SET_FD: /* unchanged */

941 case LOOP_CHANGE_FD: /* unchanged */

942 - return cloop_ioctl(bdev, mode, cmd, arg);

943 - default:

944 - return -ENOIOCTLCMD;

945 + return cloop_ioctl(bdev, mode, cmd, arg);

946 + break;

947 }

948 + return -ENOIOCTLCMD;

949 }

950 #endif

951

952 @@ -1093,7 +1165,7 @@

953 cloop_dev[cloop_num]->refcnt-=1;

954 }

955

956 -static const struct block_device_operations clo_fops =

957 +static struct block_device_operations clo_fops =

958 {

959 owner: THIS_MODULE,

960 open: cloop_open,

961 @@ -1105,12 +1177,6 @@

962 /* locked_ioctl ceased to exist in 2.6.36 */

963 };

964

965 -static const struct blk_mq_ops cloop_mq_ops = {

966 - .queue_rq = cloop_queue_rq,

967 -/* .init_request = cloop_init_request, */

968 -/* .complete = cloop_complete_rq, */

969 -};

970 -

971 static int cloop_register_blkdev(int major_nr)

972 {

973 return register_blkdev(major_nr, cloop_name);

974 @@ -1124,37 +1190,33 @@

975

976 static int cloop_alloc(int cloop_num)

977 {

978 - struct cloop_device *clo = (struct cloop_device *) cloop_malloc(sizeof(struct cloop_device));

979 + struct cloop_device *clo = (struct cloop_device *) cloop_malloc(sizeof(struct cloop_device));;

980 if(clo == NULL) goto error_out;

981 cloop_dev[cloop_num] = clo;

982 memset(clo, 0, sizeof(struct cloop_device));

983 clo->clo_number = cloop_num;

984 - clo->tag_set.ops = &cloop_mq_ops;

985 - clo->tag_set.nr_hw_queues = 1;

986 - clo->tag_set.queue_depth = 128;

987 - clo->tag_set.numa_node = NUMA_NO_NODE;

988 - clo->tag_set.cmd_size = 0; /* No extra data needed */

989 - /* BLK_MQ_F_BLOCKING is extremely important if we want to call blocking functions like vfs_read */

990 - clo->tag_set.flags = BLK_MQ_F_SHOULD_MERGE | BLK_MQ_F_BLOCKING;

991 - clo->tag_set.driver_data = clo;

992 - if(blk_mq_alloc_tag_set(&clo->tag_set)) goto error_out_free_clo;

993 - clo->clo_queue = blk_mq_init_queue(&clo->tag_set);

994 - if(IS_ERR(clo->clo_queue))

995 + clo->clo_thread = NULL;

996 + init_waitqueue_head(&clo->clo_event);

997 + spin_lock_init(&clo->queue_lock);

998 + mutex_init(&clo->clo_ctl_mutex);

999 + INIT_LIST_HEAD(&clo->clo_list);

1000 + clo->clo_queue = blk_init_queue(cloop_do_request, &clo->queue_lock);

1001 + if(!clo->clo_queue)

1002 {

1003 printk(KERN_ERR "%s: Unable to alloc queue[%d]\n", cloop_name, cloop_num);

1004 - goto error_out_free_tags;

1005 + goto error_out;

1006 }

1007 clo->clo_queue->queuedata = clo;

1008 - blk_queue_max_hw_sectors(clo->clo_queue, BLK_DEF_MAX_SECTORS);

1009 +#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 12, 0)

1010 + queue_flag_set_unlocked(QUEUE_FLAG_NONROT, clo->clo_queue);

1011 + queue_flag_set_unlocked(QUEUE_FLAG_NOMERGES, clo->clo_queue);

1012 +#endif

1013 clo->clo_disk = alloc_disk(1);

1014 if(!clo->clo_disk)

1015 {

1016 printk(KERN_ERR "%s: Unable to alloc disk[%d]\n", cloop_name, cloop_num);

1017 - goto error_out_free_queue;

1018 + goto error_disk;

1019 }

1020 - spin_lock_init(&clo->queue_lock);

1021 - mutex_init(&clo->clo_ctl_mutex);

1022 - mutex_init(&clo->clo_rq_mutex);

1023 clo->clo_disk->major = cloop_major;

1024 clo->clo_disk->first_minor = cloop_num;

1025 clo->clo_disk->fops = &clo_fops;

1026 @@ -1163,12 +1225,8 @@

1027 sprintf(clo->clo_disk->disk_name, "%s%d", cloop_name, cloop_num);

1028 add_disk(clo->clo_disk);

1029 return 0;

1030 -error_out_free_queue:

1031 +error_disk:

1032 blk_cleanup_queue(clo->clo_queue);

1033 -error_out_free_tags:

1034 - blk_mq_free_tag_set(&clo->tag_set);

1035 -error_out_free_clo:

1036 - cloop_free(clo, sizeof(struct cloop_device));

1037 error_out:

1038 return -ENOMEM;

1039 }

1040 @@ -1179,7 +1237,6 @@

1041 if(clo == NULL) return;

1042 del_gendisk(clo->clo_disk);

1043 blk_cleanup_queue(clo->clo_queue);

1044 - blk_mq_free_tag_set(&clo->tag_set);

1045 put_disk(clo->clo_disk);

1046 cloop_free(clo, sizeof(struct cloop_device));

1047 cloop_dev[cloop_num] = NULL;

1048 --- cloop_suspend.c

1049 +++ cloop_suspend.c

1050 @@ -14,6 +14,7 @@

1051 #include <fcntl.h>

1052 #include <unistd.h>

1053 #include <stdio.h>

1054 +#include <stdint.h>

1055

1056 /* We don't use the structure, so that define does not hurt */

1057 #define dev_t int

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