aboutsummaryrefslogtreecommitdiffstats
path: root/fs/btrfs/file.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/btrfs/file.c')
-rw-r--r--fs/btrfs/file.c669
1 files changed, 266 insertions, 403 deletions
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 77f759302e12..feaa13b105d9 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -179,18 +179,14 @@ int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
179 } 179 }
180 flags = em->flags; 180 flags = em->flags;
181 if (skip_pinned && test_bit(EXTENT_FLAG_PINNED, &em->flags)) { 181 if (skip_pinned && test_bit(EXTENT_FLAG_PINNED, &em->flags)) {
182 if (em->start <= start && 182 if (testend && em->start + em->len >= start + len) {
183 (!testend || em->start + em->len >= start + len)) {
184 free_extent_map(em); 183 free_extent_map(em);
185 write_unlock(&em_tree->lock); 184 write_unlock(&em_tree->lock);
186 break; 185 break;
187 } 186 }
188 if (start < em->start) { 187 start = em->start + em->len;
189 len = em->start - start; 188 if (testend)
190 } else {
191 len = start + len - (em->start + em->len); 189 len = start + len - (em->start + em->len);
192 start = em->start + em->len;
193 }
194 free_extent_map(em); 190 free_extent_map(em);
195 write_unlock(&em_tree->lock); 191 write_unlock(&em_tree->lock);
196 continue; 192 continue;
@@ -265,319 +261,247 @@ int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
265 * If an extent intersects the range but is not entirely inside the range 261 * If an extent intersects the range but is not entirely inside the range
266 * it is either truncated or split. Anything entirely inside the range 262 * it is either truncated or split. Anything entirely inside the range
267 * is deleted from the tree. 263 * is deleted from the tree.
268 *
269 * inline_limit is used to tell this code which offsets in the file to keep
270 * if they contain inline extents.
271 */ 264 */
272noinline int btrfs_drop_extents(struct btrfs_trans_handle *trans, 265int btrfs_drop_extents(struct btrfs_trans_handle *trans, struct inode *inode,
273 struct btrfs_root *root, struct inode *inode, 266 u64 start, u64 end, u64 *hint_byte, int drop_cache)
274 u64 start, u64 end, u64 locked_end,
275 u64 inline_limit, u64 *hint_byte, int drop_cache)
276{ 267{
277 u64 extent_end = 0; 268 struct btrfs_root *root = BTRFS_I(inode)->root;
278 u64 search_start = start;
279 u64 ram_bytes = 0;
280 u64 disk_bytenr = 0;
281 u64 orig_locked_end = locked_end;
282 u8 compression;
283 u8 encryption;
284 u16 other_encoding = 0;
285 struct extent_buffer *leaf; 269 struct extent_buffer *leaf;
286 struct btrfs_file_extent_item *extent; 270 struct btrfs_file_extent_item *fi;
287 struct btrfs_path *path; 271 struct btrfs_path *path;
288 struct btrfs_key key; 272 struct btrfs_key key;
289 struct btrfs_file_extent_item old; 273 struct btrfs_key new_key;
290 int keep; 274 u64 search_start = start;
291 int slot; 275 u64 disk_bytenr = 0;
292 int bookend; 276 u64 num_bytes = 0;
293 int found_type = 0; 277 u64 extent_offset = 0;
294 int found_extent; 278 u64 extent_end = 0;
295 int found_inline; 279 int del_nr = 0;
280 int del_slot = 0;
281 int extent_type;
296 int recow; 282 int recow;
297 int ret; 283 int ret;
298 284
299 inline_limit = 0;
300 if (drop_cache) 285 if (drop_cache)
301 btrfs_drop_extent_cache(inode, start, end - 1, 0); 286 btrfs_drop_extent_cache(inode, start, end - 1, 0);
302 287
303 path = btrfs_alloc_path(); 288 path = btrfs_alloc_path();
304 if (!path) 289 if (!path)
305 return -ENOMEM; 290 return -ENOMEM;
291
306 while (1) { 292 while (1) {
307 recow = 0; 293 recow = 0;
308 btrfs_release_path(root, path);
309 ret = btrfs_lookup_file_extent(trans, root, path, inode->i_ino, 294 ret = btrfs_lookup_file_extent(trans, root, path, inode->i_ino,
310 search_start, -1); 295 search_start, -1);
311 if (ret < 0) 296 if (ret < 0)
312 goto out; 297 break;
313 if (ret > 0) { 298 if (ret > 0 && path->slots[0] > 0 && search_start == start) {
314 if (path->slots[0] == 0) { 299 leaf = path->nodes[0];
315 ret = 0; 300 btrfs_item_key_to_cpu(leaf, &key, path->slots[0] - 1);
316 goto out; 301 if (key.objectid == inode->i_ino &&
317 } 302 key.type == BTRFS_EXTENT_DATA_KEY)
318 path->slots[0]--; 303 path->slots[0]--;
319 } 304 }
305 ret = 0;
320next_slot: 306next_slot:
321 keep = 0;
322 bookend = 0;
323 found_extent = 0;
324 found_inline = 0;
325 compression = 0;
326 encryption = 0;
327 extent = NULL;
328 leaf = path->nodes[0]; 307 leaf = path->nodes[0];
329 slot = path->slots[0]; 308 if (path->slots[0] >= btrfs_header_nritems(leaf)) {
330 ret = 0; 309 BUG_ON(del_nr > 0);
331 btrfs_item_key_to_cpu(leaf, &key, slot); 310 ret = btrfs_next_leaf(root, path);
332 if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY && 311 if (ret < 0)
333 key.offset >= end) { 312 break;
334 goto out; 313 if (ret > 0) {
335 } 314 ret = 0;
336 if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY || 315 break;
337 key.objectid != inode->i_ino) {
338 goto out;
339 }
340 if (recow) {
341 search_start = max(key.offset, start);
342 continue;
343 }
344 if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) {
345 extent = btrfs_item_ptr(leaf, slot,
346 struct btrfs_file_extent_item);
347 found_type = btrfs_file_extent_type(leaf, extent);
348 compression = btrfs_file_extent_compression(leaf,
349 extent);
350 encryption = btrfs_file_extent_encryption(leaf,
351 extent);
352 other_encoding = btrfs_file_extent_other_encoding(leaf,
353 extent);
354 if (found_type == BTRFS_FILE_EXTENT_REG ||
355 found_type == BTRFS_FILE_EXTENT_PREALLOC) {
356 extent_end =
357 btrfs_file_extent_disk_bytenr(leaf,
358 extent);
359 if (extent_end)
360 *hint_byte = extent_end;
361
362 extent_end = key.offset +
363 btrfs_file_extent_num_bytes(leaf, extent);
364 ram_bytes = btrfs_file_extent_ram_bytes(leaf,
365 extent);
366 found_extent = 1;
367 } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
368 found_inline = 1;
369 extent_end = key.offset +
370 btrfs_file_extent_inline_len(leaf, extent);
371 } 316 }
317 leaf = path->nodes[0];
318 recow = 1;
319 }
320
321 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
322 if (key.objectid > inode->i_ino ||
323 key.type > BTRFS_EXTENT_DATA_KEY || key.offset >= end)
324 break;
325
326 fi = btrfs_item_ptr(leaf, path->slots[0],
327 struct btrfs_file_extent_item);
328 extent_type = btrfs_file_extent_type(leaf, fi);
329
330 if (extent_type == BTRFS_FILE_EXTENT_REG ||
331 extent_type == BTRFS_FILE_EXTENT_PREALLOC) {
332 disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
333 num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi);
334 extent_offset = btrfs_file_extent_offset(leaf, fi);
335 extent_end = key.offset +
336 btrfs_file_extent_num_bytes(leaf, fi);
337 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
338 extent_end = key.offset +
339 btrfs_file_extent_inline_len(leaf, fi);
372 } else { 340 } else {
341 WARN_ON(1);
373 extent_end = search_start; 342 extent_end = search_start;
374 } 343 }
375 344
376 /* we found nothing we can drop */ 345 if (extent_end <= search_start) {
377 if ((!found_extent && !found_inline) || 346 path->slots[0]++;
378 search_start >= extent_end) {
379 int nextret;
380 u32 nritems;
381 nritems = btrfs_header_nritems(leaf);
382 if (slot >= nritems - 1) {
383 nextret = btrfs_next_leaf(root, path);
384 if (nextret)
385 goto out;
386 recow = 1;
387 } else {
388 path->slots[0]++;
389 }
390 goto next_slot; 347 goto next_slot;
391 } 348 }
392 349
393 if (end <= extent_end && start >= key.offset && found_inline) 350 search_start = max(key.offset, start);
394 *hint_byte = EXTENT_MAP_INLINE; 351 if (recow) {
395 352 btrfs_release_path(root, path);
396 if (found_extent) { 353 continue;
397 read_extent_buffer(leaf, &old, (unsigned long)extent,
398 sizeof(old));
399 }
400
401 if (end < extent_end && end >= key.offset) {
402 bookend = 1;
403 if (found_inline && start <= key.offset)
404 keep = 1;
405 } 354 }
406 355
407 if (bookend && found_extent) { 356 /*
408 if (locked_end < extent_end) { 357 * | - range to drop - |
409 ret = try_lock_extent(&BTRFS_I(inode)->io_tree, 358 * | -------- extent -------- |
410 locked_end, extent_end - 1, 359 */
411 GFP_NOFS); 360 if (start > key.offset && end < extent_end) {
412 if (!ret) { 361 BUG_ON(del_nr > 0);
413 btrfs_release_path(root, path); 362 BUG_ON(extent_type == BTRFS_FILE_EXTENT_INLINE);
414 lock_extent(&BTRFS_I(inode)->io_tree, 363
415 locked_end, extent_end - 1, 364 memcpy(&new_key, &key, sizeof(new_key));
416 GFP_NOFS); 365 new_key.offset = start;
417 locked_end = extent_end; 366 ret = btrfs_duplicate_item(trans, root, path,
418 continue; 367 &new_key);
419 } 368 if (ret == -EAGAIN) {
420 locked_end = extent_end; 369 btrfs_release_path(root, path);
370 continue;
421 } 371 }
422 disk_bytenr = le64_to_cpu(old.disk_bytenr); 372 if (ret < 0)
423 if (disk_bytenr != 0) { 373 break;
374
375 leaf = path->nodes[0];
376 fi = btrfs_item_ptr(leaf, path->slots[0] - 1,
377 struct btrfs_file_extent_item);
378 btrfs_set_file_extent_num_bytes(leaf, fi,
379 start - key.offset);
380
381 fi = btrfs_item_ptr(leaf, path->slots[0],
382 struct btrfs_file_extent_item);
383
384 extent_offset += start - key.offset;
385 btrfs_set_file_extent_offset(leaf, fi, extent_offset);
386 btrfs_set_file_extent_num_bytes(leaf, fi,
387 extent_end - start);
388 btrfs_mark_buffer_dirty(leaf);
389
390 if (disk_bytenr > 0) {
424 ret = btrfs_inc_extent_ref(trans, root, 391 ret = btrfs_inc_extent_ref(trans, root,
425 disk_bytenr, 392 disk_bytenr, num_bytes, 0,
426 le64_to_cpu(old.disk_num_bytes), 0, 393 root->root_key.objectid,
427 root->root_key.objectid, 394 new_key.objectid,
428 key.objectid, key.offset - 395 start - extent_offset);
429 le64_to_cpu(old.offset));
430 BUG_ON(ret); 396 BUG_ON(ret);
397 *hint_byte = disk_bytenr;
431 } 398 }
399 key.offset = start;
432 } 400 }
401 /*
402 * | ---- range to drop ----- |
403 * | -------- extent -------- |
404 */
405 if (start <= key.offset && end < extent_end) {
406 BUG_ON(extent_type == BTRFS_FILE_EXTENT_INLINE);
433 407
434 if (found_inline) { 408 memcpy(&new_key, &key, sizeof(new_key));
435 u64 mask = root->sectorsize - 1; 409 new_key.offset = end;
436 search_start = (extent_end + mask) & ~mask; 410 btrfs_set_item_key_safe(trans, root, path, &new_key);
437 } else 411
438 search_start = extent_end; 412 extent_offset += end - key.offset;
439 413 btrfs_set_file_extent_offset(leaf, fi, extent_offset);
440 /* truncate existing extent */ 414 btrfs_set_file_extent_num_bytes(leaf, fi,
441 if (start > key.offset) { 415 extent_end - end);
442 u64 new_num; 416 btrfs_mark_buffer_dirty(leaf);
443 u64 old_num; 417 if (disk_bytenr > 0) {
444 keep = 1; 418 inode_sub_bytes(inode, end - key.offset);
445 WARN_ON(start & (root->sectorsize - 1)); 419 *hint_byte = disk_bytenr;
446 if (found_extent) {
447 new_num = start - key.offset;
448 old_num = btrfs_file_extent_num_bytes(leaf,
449 extent);
450 *hint_byte =
451 btrfs_file_extent_disk_bytenr(leaf,
452 extent);
453 if (btrfs_file_extent_disk_bytenr(leaf,
454 extent)) {
455 inode_sub_bytes(inode, old_num -
456 new_num);
457 }
458 btrfs_set_file_extent_num_bytes(leaf,
459 extent, new_num);
460 btrfs_mark_buffer_dirty(leaf);
461 } else if (key.offset < inline_limit &&
462 (end > extent_end) &&
463 (inline_limit < extent_end)) {
464 u32 new_size;
465 new_size = btrfs_file_extent_calc_inline_size(
466 inline_limit - key.offset);
467 inode_sub_bytes(inode, extent_end -
468 inline_limit);
469 btrfs_set_file_extent_ram_bytes(leaf, extent,
470 new_size);
471 if (!compression && !encryption) {
472 btrfs_truncate_item(trans, root, path,
473 new_size, 1);
474 }
475 } 420 }
421 break;
476 } 422 }
477 /* delete the entire extent */
478 if (!keep) {
479 if (found_inline)
480 inode_sub_bytes(inode, extent_end -
481 key.offset);
482 ret = btrfs_del_item(trans, root, path);
483 /* TODO update progress marker and return */
484 BUG_ON(ret);
485 extent = NULL;
486 btrfs_release_path(root, path);
487 /* the extent will be freed later */
488 }
489 if (bookend && found_inline && start <= key.offset) {
490 u32 new_size;
491 new_size = btrfs_file_extent_calc_inline_size(
492 extent_end - end);
493 inode_sub_bytes(inode, end - key.offset);
494 btrfs_set_file_extent_ram_bytes(leaf, extent,
495 new_size);
496 if (!compression && !encryption)
497 ret = btrfs_truncate_item(trans, root, path,
498 new_size, 0);
499 BUG_ON(ret);
500 }
501 /* create bookend, splitting the extent in two */
502 if (bookend && found_extent) {
503 struct btrfs_key ins;
504 ins.objectid = inode->i_ino;
505 ins.offset = end;
506 btrfs_set_key_type(&ins, BTRFS_EXTENT_DATA_KEY);
507 423
508 btrfs_release_path(root, path); 424 search_start = extent_end;
509 path->leave_spinning = 1; 425 /*
510 ret = btrfs_insert_empty_item(trans, root, path, &ins, 426 * | ---- range to drop ----- |
511 sizeof(*extent)); 427 * | -------- extent -------- |
512 BUG_ON(ret); 428 */
429 if (start > key.offset && end >= extent_end) {
430 BUG_ON(del_nr > 0);
431 BUG_ON(extent_type == BTRFS_FILE_EXTENT_INLINE);
513 432
514 leaf = path->nodes[0]; 433 btrfs_set_file_extent_num_bytes(leaf, fi,
515 extent = btrfs_item_ptr(leaf, path->slots[0], 434 start - key.offset);
516 struct btrfs_file_extent_item); 435 btrfs_mark_buffer_dirty(leaf);
517 write_extent_buffer(leaf, &old, 436 if (disk_bytenr > 0) {
518 (unsigned long)extent, sizeof(old)); 437 inode_sub_bytes(inode, extent_end - start);
519 438 *hint_byte = disk_bytenr;
520 btrfs_set_file_extent_compression(leaf, extent, 439 }
521 compression); 440 if (end == extent_end)
522 btrfs_set_file_extent_encryption(leaf, extent, 441 break;
523 encryption);
524 btrfs_set_file_extent_other_encoding(leaf, extent,
525 other_encoding);
526 btrfs_set_file_extent_offset(leaf, extent,
527 le64_to_cpu(old.offset) + end - key.offset);
528 WARN_ON(le64_to_cpu(old.num_bytes) <
529 (extent_end - end));
530 btrfs_set_file_extent_num_bytes(leaf, extent,
531 extent_end - end);
532 442
533 /* 443 path->slots[0]++;
534 * set the ram bytes to the size of the full extent 444 goto next_slot;
535 * before splitting. This is a worst case flag,
536 * but its the best we can do because we don't know
537 * how splitting affects compression
538 */
539 btrfs_set_file_extent_ram_bytes(leaf, extent,
540 ram_bytes);
541 btrfs_set_file_extent_type(leaf, extent, found_type);
542
543 btrfs_unlock_up_safe(path, 1);
544 btrfs_mark_buffer_dirty(path->nodes[0]);
545 btrfs_set_lock_blocking(path->nodes[0]);
546
547 path->leave_spinning = 0;
548 btrfs_release_path(root, path);
549 if (disk_bytenr != 0)
550 inode_add_bytes(inode, extent_end - end);
551 } 445 }
552 446
553 if (found_extent && !keep) { 447 /*
554 u64 old_disk_bytenr = le64_to_cpu(old.disk_bytenr); 448 * | ---- range to drop ----- |
449 * | ------ extent ------ |
450 */
451 if (start <= key.offset && end >= extent_end) {
452 if (del_nr == 0) {
453 del_slot = path->slots[0];
454 del_nr = 1;
455 } else {
456 BUG_ON(del_slot + del_nr != path->slots[0]);
457 del_nr++;
458 }
555 459
556 if (old_disk_bytenr != 0) { 460 if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
557 inode_sub_bytes(inode, 461 inode_sub_bytes(inode,
558 le64_to_cpu(old.num_bytes)); 462 extent_end - key.offset);
463 extent_end = ALIGN(extent_end,
464 root->sectorsize);
465 } else if (disk_bytenr > 0) {
559 ret = btrfs_free_extent(trans, root, 466 ret = btrfs_free_extent(trans, root,
560 old_disk_bytenr, 467 disk_bytenr, num_bytes, 0,
561 le64_to_cpu(old.disk_num_bytes), 468 root->root_key.objectid,
562 0, root->root_key.objectid,
563 key.objectid, key.offset - 469 key.objectid, key.offset -
564 le64_to_cpu(old.offset)); 470 extent_offset);
565 BUG_ON(ret); 471 BUG_ON(ret);
566 *hint_byte = old_disk_bytenr; 472 inode_sub_bytes(inode,
473 extent_end - key.offset);
474 *hint_byte = disk_bytenr;
567 } 475 }
568 }
569 476
570 if (search_start >= end) { 477 if (end == extent_end)
571 ret = 0; 478 break;
572 goto out; 479
480 if (path->slots[0] + 1 < btrfs_header_nritems(leaf)) {
481 path->slots[0]++;
482 goto next_slot;
483 }
484
485 ret = btrfs_del_items(trans, root, path, del_slot,
486 del_nr);
487 BUG_ON(ret);
488
489 del_nr = 0;
490 del_slot = 0;
491
492 btrfs_release_path(root, path);
493 continue;
573 } 494 }
495
496 BUG_ON(1);
574 } 497 }
575out: 498
576 btrfs_free_path(path); 499 if (del_nr > 0) {
577 if (locked_end > orig_locked_end) { 500 ret = btrfs_del_items(trans, root, path, del_slot, del_nr);
578 unlock_extent(&BTRFS_I(inode)->io_tree, orig_locked_end, 501 BUG_ON(ret);
579 locked_end - 1, GFP_NOFS);
580 } 502 }
503
504 btrfs_free_path(path);
581 return ret; 505 return ret;
582} 506}
583 507
@@ -620,23 +544,23 @@ static int extent_mergeable(struct extent_buffer *leaf, int slot,
620 * two or three. 544 * two or three.
621 */ 545 */
622int btrfs_mark_extent_written(struct btrfs_trans_handle *trans, 546int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
623 struct btrfs_root *root,
624 struct inode *inode, u64 start, u64 end) 547 struct inode *inode, u64 start, u64 end)
625{ 548{
549 struct btrfs_root *root = BTRFS_I(inode)->root;
626 struct extent_buffer *leaf; 550 struct extent_buffer *leaf;
627 struct btrfs_path *path; 551 struct btrfs_path *path;
628 struct btrfs_file_extent_item *fi; 552 struct btrfs_file_extent_item *fi;
629 struct btrfs_key key; 553 struct btrfs_key key;
554 struct btrfs_key new_key;
630 u64 bytenr; 555 u64 bytenr;
631 u64 num_bytes; 556 u64 num_bytes;
632 u64 extent_end; 557 u64 extent_end;
633 u64 orig_offset; 558 u64 orig_offset;
634 u64 other_start; 559 u64 other_start;
635 u64 other_end; 560 u64 other_end;
636 u64 split = start; 561 u64 split;
637 u64 locked_end = end; 562 int del_nr = 0;
638 int extent_type; 563 int del_slot = 0;
639 int split_end = 1;
640 int ret; 564 int ret;
641 565
642 btrfs_drop_extent_cache(inode, start, end - 1, 0); 566 btrfs_drop_extent_cache(inode, start, end - 1, 0);
@@ -644,12 +568,10 @@ int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
644 path = btrfs_alloc_path(); 568 path = btrfs_alloc_path();
645 BUG_ON(!path); 569 BUG_ON(!path);
646again: 570again:
571 split = start;
647 key.objectid = inode->i_ino; 572 key.objectid = inode->i_ino;
648 key.type = BTRFS_EXTENT_DATA_KEY; 573 key.type = BTRFS_EXTENT_DATA_KEY;
649 if (split == start) 574 key.offset = split;
650 key.offset = split;
651 else
652 key.offset = split - 1;
653 575
654 ret = btrfs_search_slot(trans, root, &key, path, -1, 1); 576 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
655 if (ret > 0 && path->slots[0] > 0) 577 if (ret > 0 && path->slots[0] > 0)
@@ -661,8 +583,8 @@ again:
661 key.type != BTRFS_EXTENT_DATA_KEY); 583 key.type != BTRFS_EXTENT_DATA_KEY);
662 fi = btrfs_item_ptr(leaf, path->slots[0], 584 fi = btrfs_item_ptr(leaf, path->slots[0],
663 struct btrfs_file_extent_item); 585 struct btrfs_file_extent_item);
664 extent_type = btrfs_file_extent_type(leaf, fi); 586 BUG_ON(btrfs_file_extent_type(leaf, fi) !=
665 BUG_ON(extent_type != BTRFS_FILE_EXTENT_PREALLOC); 587 BTRFS_FILE_EXTENT_PREALLOC);
666 extent_end = key.offset + btrfs_file_extent_num_bytes(leaf, fi); 588 extent_end = key.offset + btrfs_file_extent_num_bytes(leaf, fi);
667 BUG_ON(key.offset > start || extent_end < end); 589 BUG_ON(key.offset > start || extent_end < end);
668 590
@@ -670,150 +592,91 @@ again:
670 num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi); 592 num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi);
671 orig_offset = key.offset - btrfs_file_extent_offset(leaf, fi); 593 orig_offset = key.offset - btrfs_file_extent_offset(leaf, fi);
672 594
673 if (key.offset == start) 595 while (start > key.offset || end < extent_end) {
674 split = end; 596 if (key.offset == start)
675 597 split = end;
676 if (key.offset == start && extent_end == end) { 598
677 int del_nr = 0; 599 memcpy(&new_key, &key, sizeof(new_key));
678 int del_slot = 0; 600 new_key.offset = split;
679 other_start = end; 601 ret = btrfs_duplicate_item(trans, root, path, &new_key);
680 other_end = 0; 602 if (ret == -EAGAIN) {
681 if (extent_mergeable(leaf, path->slots[0] + 1, inode->i_ino, 603 btrfs_release_path(root, path);
682 bytenr, &other_start, &other_end)) { 604 goto again;
683 extent_end = other_end;
684 del_slot = path->slots[0] + 1;
685 del_nr++;
686 ret = btrfs_free_extent(trans, root, bytenr, num_bytes,
687 0, root->root_key.objectid,
688 inode->i_ino, orig_offset);
689 BUG_ON(ret);
690 }
691 other_start = 0;
692 other_end = start;
693 if (extent_mergeable(leaf, path->slots[0] - 1, inode->i_ino,
694 bytenr, &other_start, &other_end)) {
695 key.offset = other_start;
696 del_slot = path->slots[0];
697 del_nr++;
698 ret = btrfs_free_extent(trans, root, bytenr, num_bytes,
699 0, root->root_key.objectid,
700 inode->i_ino, orig_offset);
701 BUG_ON(ret);
702 }
703 split_end = 0;
704 if (del_nr == 0) {
705 btrfs_set_file_extent_type(leaf, fi,
706 BTRFS_FILE_EXTENT_REG);
707 goto done;
708 } 605 }
606 BUG_ON(ret < 0);
709 607
710 fi = btrfs_item_ptr(leaf, del_slot - 1, 608 leaf = path->nodes[0];
609 fi = btrfs_item_ptr(leaf, path->slots[0] - 1,
711 struct btrfs_file_extent_item); 610 struct btrfs_file_extent_item);
712 btrfs_set_file_extent_type(leaf, fi, BTRFS_FILE_EXTENT_REG);
713 btrfs_set_file_extent_num_bytes(leaf, fi, 611 btrfs_set_file_extent_num_bytes(leaf, fi,
714 extent_end - key.offset); 612 split - key.offset);
613
614 fi = btrfs_item_ptr(leaf, path->slots[0],
615 struct btrfs_file_extent_item);
616
617 btrfs_set_file_extent_offset(leaf, fi, split - orig_offset);
618 btrfs_set_file_extent_num_bytes(leaf, fi,
619 extent_end - split);
715 btrfs_mark_buffer_dirty(leaf); 620 btrfs_mark_buffer_dirty(leaf);
716 621
717 ret = btrfs_del_items(trans, root, path, del_slot, del_nr); 622 ret = btrfs_inc_extent_ref(trans, root, bytenr, num_bytes, 0,
623 root->root_key.objectid,
624 inode->i_ino, orig_offset);
718 BUG_ON(ret); 625 BUG_ON(ret);
719 goto release;
720 } else if (split == start) {
721 if (locked_end < extent_end) {
722 ret = try_lock_extent(&BTRFS_I(inode)->io_tree,
723 locked_end, extent_end - 1, GFP_NOFS);
724 if (!ret) {
725 btrfs_release_path(root, path);
726 lock_extent(&BTRFS_I(inode)->io_tree,
727 locked_end, extent_end - 1, GFP_NOFS);
728 locked_end = extent_end;
729 goto again;
730 }
731 locked_end = extent_end;
732 }
733 btrfs_set_file_extent_num_bytes(leaf, fi, split - key.offset);
734 } else {
735 BUG_ON(key.offset != start);
736 key.offset = split;
737 btrfs_set_file_extent_offset(leaf, fi, key.offset -
738 orig_offset);
739 btrfs_set_file_extent_num_bytes(leaf, fi, extent_end - split);
740 btrfs_set_item_key_safe(trans, root, path, &key);
741 extent_end = split;
742 }
743 626
744 if (extent_end == end) { 627 if (split == start) {
745 split_end = 0; 628 key.offset = start;
746 extent_type = BTRFS_FILE_EXTENT_REG; 629 } else {
747 } 630 BUG_ON(start != key.offset);
748 if (extent_end == end && split == start) {
749 other_start = end;
750 other_end = 0;
751 if (extent_mergeable(leaf, path->slots[0] + 1, inode->i_ino,
752 bytenr, &other_start, &other_end)) {
753 path->slots[0]++;
754 fi = btrfs_item_ptr(leaf, path->slots[0],
755 struct btrfs_file_extent_item);
756 key.offset = split;
757 btrfs_set_item_key_safe(trans, root, path, &key);
758 btrfs_set_file_extent_offset(leaf, fi, key.offset -
759 orig_offset);
760 btrfs_set_file_extent_num_bytes(leaf, fi,
761 other_end - split);
762 goto done;
763 }
764 }
765 if (extent_end == end && split == end) {
766 other_start = 0;
767 other_end = start;
768 if (extent_mergeable(leaf, path->slots[0] - 1 , inode->i_ino,
769 bytenr, &other_start, &other_end)) {
770 path->slots[0]--; 631 path->slots[0]--;
771 fi = btrfs_item_ptr(leaf, path->slots[0], 632 extent_end = end;
772 struct btrfs_file_extent_item);
773 btrfs_set_file_extent_num_bytes(leaf, fi, extent_end -
774 other_start);
775 goto done;
776 } 633 }
777 } 634 }
778 635
779 btrfs_mark_buffer_dirty(leaf);
780
781 ret = btrfs_inc_extent_ref(trans, root, bytenr, num_bytes, 0,
782 root->root_key.objectid,
783 inode->i_ino, orig_offset);
784 BUG_ON(ret);
785 btrfs_release_path(root, path);
786
787 key.offset = start;
788 ret = btrfs_insert_empty_item(trans, root, path, &key, sizeof(*fi));
789 BUG_ON(ret);
790
791 leaf = path->nodes[0];
792 fi = btrfs_item_ptr(leaf, path->slots[0], 636 fi = btrfs_item_ptr(leaf, path->slots[0],
793 struct btrfs_file_extent_item); 637 struct btrfs_file_extent_item);
794 btrfs_set_file_extent_generation(leaf, fi, trans->transid);
795 btrfs_set_file_extent_type(leaf, fi, extent_type);
796 btrfs_set_file_extent_disk_bytenr(leaf, fi, bytenr);
797 btrfs_set_file_extent_disk_num_bytes(leaf, fi, num_bytes);
798 btrfs_set_file_extent_offset(leaf, fi, key.offset - orig_offset);
799 btrfs_set_file_extent_num_bytes(leaf, fi, extent_end - key.offset);
800 btrfs_set_file_extent_ram_bytes(leaf, fi, num_bytes);
801 btrfs_set_file_extent_compression(leaf, fi, 0);
802 btrfs_set_file_extent_encryption(leaf, fi, 0);
803 btrfs_set_file_extent_other_encoding(leaf, fi, 0);
804done:
805 btrfs_mark_buffer_dirty(leaf);
806 638
807release: 639 other_start = end;
808 btrfs_release_path(root, path); 640 other_end = 0;
809 if (split_end && split == start) { 641 if (extent_mergeable(leaf, path->slots[0] + 1, inode->i_ino,
810 split = end; 642 bytenr, &other_start, &other_end)) {
811 goto again; 643 extent_end = other_end;
644 del_slot = path->slots[0] + 1;
645 del_nr++;
646 ret = btrfs_free_extent(trans, root, bytenr, num_bytes,
647 0, root->root_key.objectid,
648 inode->i_ino, orig_offset);
649 BUG_ON(ret);
812 } 650 }
813 if (locked_end > end) { 651 other_start = 0;
814 unlock_extent(&BTRFS_I(inode)->io_tree, end, locked_end - 1, 652 other_end = start;
815 GFP_NOFS); 653 if (extent_mergeable(leaf, path->slots[0] - 1, inode->i_ino,
654 bytenr, &other_start, &other_end)) {
655 key.offset = other_start;
656 del_slot = path->slots[0];
657 del_nr++;
658 ret = btrfs_free_extent(trans, root, bytenr, num_bytes,
659 0, root->root_key.objectid,
660 inode->i_ino, orig_offset);
661 BUG_ON(ret);
816 } 662 }
663 if (del_nr == 0) {
664 btrfs_set_file_extent_type(leaf, fi,
665 BTRFS_FILE_EXTENT_REG);
666 btrfs_mark_buffer_dirty(leaf);
667 goto out;
668 }
669
670 fi = btrfs_item_ptr(leaf, del_slot - 1,
671 struct btrfs_file_extent_item);
672 btrfs_set_file_extent_type(leaf, fi, BTRFS_FILE_EXTENT_REG);
673 btrfs_set_file_extent_num_bytes(leaf, fi,
674 extent_end - key.offset);
675 btrfs_mark_buffer_dirty(leaf);
676
677 ret = btrfs_del_items(trans, root, path, del_slot, del_nr);
678 BUG_ON(ret);
679out:
817 btrfs_free_path(path); 680 btrfs_free_path(path);
818 return 0; 681 return 0;
819} 682}
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-11 07:39:12 -0500