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-rw-r--r--fs/ext4/move_extent.c1068
1 files changed, 123 insertions, 945 deletions
diff --git a/fs/ext4/move_extent.c b/fs/ext4/move_extent.c
index 671a74b14fd7..9f2311bc9c4f 100644
--- a/fs/ext4/move_extent.c
+++ b/fs/ext4/move_extent.c
@@ -27,120 +27,26 @@
27 * @lblock: logical block number to find an extent path 27 * @lblock: logical block number to find an extent path
28 * @path: pointer to an extent path pointer (for output) 28 * @path: pointer to an extent path pointer (for output)
29 * 29 *
30 * ext4_ext_find_extent wrapper. Return 0 on success, or a negative error value 30 * ext4_find_extent wrapper. Return 0 on success, or a negative error value
31 * on failure. 31 * on failure.
32 */ 32 */
33static inline int 33static inline int
34get_ext_path(struct inode *inode, ext4_lblk_t lblock, 34get_ext_path(struct inode *inode, ext4_lblk_t lblock,
35 struct ext4_ext_path **orig_path) 35 struct ext4_ext_path **ppath)
36{ 36{
37 int ret = 0;
38 struct ext4_ext_path *path; 37 struct ext4_ext_path *path;
39 38
40 path = ext4_ext_find_extent(inode, lblock, *orig_path, EXT4_EX_NOCACHE); 39 path = ext4_find_extent(inode, lblock, ppath, EXT4_EX_NOCACHE);
41 if (IS_ERR(path)) 40 if (IS_ERR(path))
42 ret = PTR_ERR(path); 41 return PTR_ERR(path);
43 else if (path[ext_depth(inode)].p_ext == NULL) 42 if (path[ext_depth(inode)].p_ext == NULL) {
44 ret = -ENODATA; 43 ext4_ext_drop_refs(path);
45 else 44 kfree(path);
46 *orig_path = path; 45 *ppath = NULL;
47 46 return -ENODATA;
48 return ret;
49}
50
51/**
52 * copy_extent_status - Copy the extent's initialization status
53 *
54 * @src: an extent for getting initialize status
55 * @dest: an extent to be set the status
56 */
57static void
58copy_extent_status(struct ext4_extent *src, struct ext4_extent *dest)
59{
60 if (ext4_ext_is_unwritten(src))
61 ext4_ext_mark_unwritten(dest);
62 else
63 dest->ee_len = cpu_to_le16(ext4_ext_get_actual_len(dest));
64}
65
66/**
67 * mext_next_extent - Search for the next extent and set it to "extent"
68 *
69 * @inode: inode which is searched
70 * @path: this will obtain data for the next extent
71 * @extent: pointer to the next extent we have just gotten
72 *
73 * Search the next extent in the array of ext4_ext_path structure (@path)
74 * and set it to ext4_extent structure (@extent). In addition, the member of
75 * @path (->p_ext) also points the next extent. Return 0 on success, 1 if
76 * ext4_ext_path structure refers to the last extent, or a negative error
77 * value on failure.
78 */
79int
80mext_next_extent(struct inode *inode, struct ext4_ext_path *path,
81 struct ext4_extent **extent)
82{
83 struct ext4_extent_header *eh;
84 int ppos, leaf_ppos = path->p_depth;
85
86 ppos = leaf_ppos;
87 if (EXT_LAST_EXTENT(path[ppos].p_hdr) > path[ppos].p_ext) {
88 /* leaf block */
89 *extent = ++path[ppos].p_ext;
90 path[ppos].p_block = ext4_ext_pblock(path[ppos].p_ext);
91 return 0;
92 }
93
94 while (--ppos >= 0) {
95 if (EXT_LAST_INDEX(path[ppos].p_hdr) >
96 path[ppos].p_idx) {
97 int cur_ppos = ppos;
98
99 /* index block */
100 path[ppos].p_idx++;
101 path[ppos].p_block = ext4_idx_pblock(path[ppos].p_idx);
102 if (path[ppos+1].p_bh)
103 brelse(path[ppos+1].p_bh);
104 path[ppos+1].p_bh =
105 sb_bread(inode->i_sb, path[ppos].p_block);
106 if (!path[ppos+1].p_bh)
107 return -EIO;
108 path[ppos+1].p_hdr =
109 ext_block_hdr(path[ppos+1].p_bh);
110
111 /* Halfway index block */
112 while (++cur_ppos < leaf_ppos) {
113 path[cur_ppos].p_idx =
114 EXT_FIRST_INDEX(path[cur_ppos].p_hdr);
115 path[cur_ppos].p_block =
116 ext4_idx_pblock(path[cur_ppos].p_idx);
117 if (path[cur_ppos+1].p_bh)
118 brelse(path[cur_ppos+1].p_bh);
119 path[cur_ppos+1].p_bh = sb_bread(inode->i_sb,
120 path[cur_ppos].p_block);
121 if (!path[cur_ppos+1].p_bh)
122 return -EIO;
123 path[cur_ppos+1].p_hdr =
124 ext_block_hdr(path[cur_ppos+1].p_bh);
125 }
126
127 path[leaf_ppos].p_ext = *extent = NULL;
128
129 eh = path[leaf_ppos].p_hdr;
130 if (le16_to_cpu(eh->eh_entries) == 0)
131 /* empty leaf is found */
132 return -ENODATA;
133
134 /* leaf block */
135 path[leaf_ppos].p_ext = *extent =
136 EXT_FIRST_EXTENT(path[leaf_ppos].p_hdr);
137 path[leaf_ppos].p_block =
138 ext4_ext_pblock(path[leaf_ppos].p_ext);
139 return 0;
140 }
141 } 47 }
142 /* We found the last extent */ 48 *ppath = path;
143 return 1; 49 return 0;
144} 50}
145 51
146/** 52/**
@@ -178,417 +84,6 @@ ext4_double_up_write_data_sem(struct inode *orig_inode,
178} 84}
179 85
180/** 86/**
181 * mext_insert_across_blocks - Insert extents across leaf block
182 *
183 * @handle: journal handle
184 * @orig_inode: original inode
185 * @o_start: first original extent to be changed
186 * @o_end: last original extent to be changed
187 * @start_ext: first new extent to be inserted
188 * @new_ext: middle of new extent to be inserted
189 * @end_ext: last new extent to be inserted
190 *
191 * Allocate a new leaf block and insert extents into it. Return 0 on success,
192 * or a negative error value on failure.
193 */
194static int
195mext_insert_across_blocks(handle_t *handle, struct inode *orig_inode,
196 struct ext4_extent *o_start, struct ext4_extent *o_end,
197 struct ext4_extent *start_ext, struct ext4_extent *new_ext,
198 struct ext4_extent *end_ext)
199{
200 struct ext4_ext_path *orig_path = NULL;
201 ext4_lblk_t eblock = 0;
202 int new_flag = 0;
203 int end_flag = 0;
204 int err = 0;
205
206 if (start_ext->ee_len && new_ext->ee_len && end_ext->ee_len) {
207 if (o_start == o_end) {
208
209 /* start_ext new_ext end_ext
210 * donor |---------|-----------|--------|
211 * orig |------------------------------|
212 */
213 end_flag = 1;
214 } else {
215
216 /* start_ext new_ext end_ext
217 * donor |---------|----------|---------|
218 * orig |---------------|--------------|
219 */
220 o_end->ee_block = end_ext->ee_block;
221 o_end->ee_len = end_ext->ee_len;
222 ext4_ext_store_pblock(o_end, ext4_ext_pblock(end_ext));
223 }
224
225 o_start->ee_len = start_ext->ee_len;
226 eblock = le32_to_cpu(start_ext->ee_block);
227 new_flag = 1;
228
229 } else if (start_ext->ee_len && new_ext->ee_len &&
230 !end_ext->ee_len && o_start == o_end) {
231
232 /* start_ext new_ext
233 * donor |--------------|---------------|
234 * orig |------------------------------|
235 */
236 o_start->ee_len = start_ext->ee_len;
237 eblock = le32_to_cpu(start_ext->ee_block);
238 new_flag = 1;
239
240 } else if (!start_ext->ee_len && new_ext->ee_len &&
241 end_ext->ee_len && o_start == o_end) {
242
243 /* new_ext end_ext
244 * donor |--------------|---------------|
245 * orig |------------------------------|
246 */
247 o_end->ee_block = end_ext->ee_block;
248 o_end->ee_len = end_ext->ee_len;
249 ext4_ext_store_pblock(o_end, ext4_ext_pblock(end_ext));
250
251 /*
252 * Set 0 to the extent block if new_ext was
253 * the first block.
254 */
255 if (new_ext->ee_block)
256 eblock = le32_to_cpu(new_ext->ee_block);
257
258 new_flag = 1;
259 } else {
260 ext4_debug("ext4 move extent: Unexpected insert case\n");
261 return -EIO;
262 }
263
264 if (new_flag) {
265 err = get_ext_path(orig_inode, eblock, &orig_path);
266 if (err)
267 goto out;
268
269 if (ext4_ext_insert_extent(handle, orig_inode,
270 orig_path, new_ext, 0))
271 goto out;
272 }
273
274 if (end_flag) {
275 err = get_ext_path(orig_inode,
276 le32_to_cpu(end_ext->ee_block) - 1, &orig_path);
277 if (err)
278 goto out;
279
280 if (ext4_ext_insert_extent(handle, orig_inode,
281 orig_path, end_ext, 0))
282 goto out;
283 }
284out:
285 if (orig_path) {
286 ext4_ext_drop_refs(orig_path);
287 kfree(orig_path);
288 }
289
290 return err;
291
292}
293
294/**
295 * mext_insert_inside_block - Insert new extent to the extent block
296 *
297 * @o_start: first original extent to be moved
298 * @o_end: last original extent to be moved
299 * @start_ext: first new extent to be inserted
300 * @new_ext: middle of new extent to be inserted
301 * @end_ext: last new extent to be inserted
302 * @eh: extent header of target leaf block
303 * @range_to_move: used to decide how to insert extent
304 *
305 * Insert extents into the leaf block. The extent (@o_start) is overwritten
306 * by inserted extents.
307 */
308static void
309mext_insert_inside_block(struct ext4_extent *o_start,
310 struct ext4_extent *o_end,
311 struct ext4_extent *start_ext,
312 struct ext4_extent *new_ext,
313 struct ext4_extent *end_ext,
314 struct ext4_extent_header *eh,
315 int range_to_move)
316{
317 int i = 0;
318 unsigned long len;
319
320 /* Move the existing extents */
321 if (range_to_move && o_end < EXT_LAST_EXTENT(eh)) {
322 len = (unsigned long)(EXT_LAST_EXTENT(eh) + 1) -
323 (unsigned long)(o_end + 1);
324 memmove(o_end + 1 + range_to_move, o_end + 1, len);
325 }
326
327 /* Insert start entry */
328 if (start_ext->ee_len)
329 o_start[i++].ee_len = start_ext->ee_len;
330
331 /* Insert new entry */
332 if (new_ext->ee_len) {
333 o_start[i] = *new_ext;
334 ext4_ext_store_pblock(&o_start[i++], ext4_ext_pblock(new_ext));
335 }
336
337 /* Insert end entry */
338 if (end_ext->ee_len)
339 o_start[i] = *end_ext;
340
341 /* Increment the total entries counter on the extent block */
342 le16_add_cpu(&eh->eh_entries, range_to_move);
343}
344
345/**
346 * mext_insert_extents - Insert new extent
347 *
348 * @handle: journal handle
349 * @orig_inode: original inode
350 * @orig_path: path indicates first extent to be changed
351 * @o_start: first original extent to be changed
352 * @o_end: last original extent to be changed
353 * @start_ext: first new extent to be inserted
354 * @new_ext: middle of new extent to be inserted
355 * @end_ext: last new extent to be inserted
356 *
357 * Call the function to insert extents. If we cannot add more extents into
358 * the leaf block, we call mext_insert_across_blocks() to create a
359 * new leaf block. Otherwise call mext_insert_inside_block(). Return 0
360 * on success, or a negative error value on failure.
361 */
362static int
363mext_insert_extents(handle_t *handle, struct inode *orig_inode,
364 struct ext4_ext_path *orig_path,
365 struct ext4_extent *o_start,
366 struct ext4_extent *o_end,
367 struct ext4_extent *start_ext,
368 struct ext4_extent *new_ext,
369 struct ext4_extent *end_ext)
370{
371 struct ext4_extent_header *eh;
372 unsigned long need_slots, slots_range;
373 int range_to_move, depth, ret;
374
375 /*
376 * The extents need to be inserted
377 * start_extent + new_extent + end_extent.
378 */
379 need_slots = (start_ext->ee_len ? 1 : 0) + (end_ext->ee_len ? 1 : 0) +
380 (new_ext->ee_len ? 1 : 0);
381
382 /* The number of slots between start and end */
383 slots_range = ((unsigned long)(o_end + 1) - (unsigned long)o_start + 1)
384 / sizeof(struct ext4_extent);
385
386 /* Range to move the end of extent */
387 range_to_move = need_slots - slots_range;
388 depth = orig_path->p_depth;
389 orig_path += depth;
390 eh = orig_path->p_hdr;
391
392 if (depth) {
393 /* Register to journal */
394 BUFFER_TRACE(orig_path->p_bh, "get_write_access");
395 ret = ext4_journal_get_write_access(handle, orig_path->p_bh);
396 if (ret)
397 return ret;
398 }
399
400 /* Expansion */
401 if (range_to_move > 0 &&
402 (range_to_move > le16_to_cpu(eh->eh_max)
403 - le16_to_cpu(eh->eh_entries))) {
404
405 ret = mext_insert_across_blocks(handle, orig_inode, o_start,
406 o_end, start_ext, new_ext, end_ext);
407 if (ret < 0)
408 return ret;
409 } else
410 mext_insert_inside_block(o_start, o_end, start_ext, new_ext,
411 end_ext, eh, range_to_move);
412
413 return ext4_ext_dirty(handle, orig_inode, orig_path);
414}
415
416/**
417 * mext_leaf_block - Move one leaf extent block into the inode.
418 *
419 * @handle: journal handle
420 * @orig_inode: original inode
421 * @orig_path: path indicates first extent to be changed
422 * @dext: donor extent
423 * @from: start offset on the target file
424 *
425 * In order to insert extents into the leaf block, we must divide the extent
426 * in the leaf block into three extents. The one is located to be inserted
427 * extents, and the others are located around it.
428 *
429 * Therefore, this function creates structures to save extents of the leaf
430 * block, and inserts extents by calling mext_insert_extents() with
431 * created extents. Return 0 on success, or a negative error value on failure.
432 */
433static int
434mext_leaf_block(handle_t *handle, struct inode *orig_inode,
435 struct ext4_ext_path *orig_path, struct ext4_extent *dext,
436 ext4_lblk_t *from)
437{
438 struct ext4_extent *oext, *o_start, *o_end, *prev_ext;
439 struct ext4_extent new_ext, start_ext, end_ext;
440 ext4_lblk_t new_ext_end;
441 int oext_alen, new_ext_alen, end_ext_alen;
442 int depth = ext_depth(orig_inode);
443 int ret;
444
445 start_ext.ee_block = end_ext.ee_block = 0;
446 o_start = o_end = oext = orig_path[depth].p_ext;
447 oext_alen = ext4_ext_get_actual_len(oext);
448 start_ext.ee_len = end_ext.ee_len = 0;
449
450 new_ext.ee_block = cpu_to_le32(*from);
451 ext4_ext_store_pblock(&new_ext, ext4_ext_pblock(dext));
452 new_ext.ee_len = dext->ee_len;
453 new_ext_alen = ext4_ext_get_actual_len(&new_ext);
454 new_ext_end = le32_to_cpu(new_ext.ee_block) + new_ext_alen - 1;
455
456 /*
457 * Case: original extent is first
458 * oext |--------|
459 * new_ext |--|
460 * start_ext |--|
461 */
462 if (le32_to_cpu(oext->ee_block) < le32_to_cpu(new_ext.ee_block) &&
463 le32_to_cpu(new_ext.ee_block) <
464 le32_to_cpu(oext->ee_block) + oext_alen) {
465 start_ext.ee_len = cpu_to_le16(le32_to_cpu(new_ext.ee_block) -
466 le32_to_cpu(oext->ee_block));
467 start_ext.ee_block = oext->ee_block;
468 copy_extent_status(oext, &start_ext);
469 } else if (oext > EXT_FIRST_EXTENT(orig_path[depth].p_hdr)) {
470 prev_ext = oext - 1;
471 /*
472 * We can merge new_ext into previous extent,
473 * if these are contiguous and same extent type.
474 */
475 if (ext4_can_extents_be_merged(orig_inode, prev_ext,
476 &new_ext)) {
477 o_start = prev_ext;
478 start_ext.ee_len = cpu_to_le16(
479 ext4_ext_get_actual_len(prev_ext) +
480 new_ext_alen);
481 start_ext.ee_block = oext->ee_block;
482 copy_extent_status(prev_ext, &start_ext);
483 new_ext.ee_len = 0;
484 }
485 }
486
487 /*
488 * Case: new_ext_end must be less than oext
489 * oext |-----------|
490 * new_ext |-------|
491 */
492 if (le32_to_cpu(oext->ee_block) + oext_alen - 1 < new_ext_end) {
493 EXT4_ERROR_INODE(orig_inode,
494 "new_ext_end(%u) should be less than or equal to "
495 "oext->ee_block(%u) + oext_alen(%d) - 1",
496 new_ext_end, le32_to_cpu(oext->ee_block),
497 oext_alen);
498 ret = -EIO;
499 goto out;
500 }
501
502 /*
503 * Case: new_ext is smaller than original extent
504 * oext |---------------|
505 * new_ext |-----------|
506 * end_ext |---|
507 */
508 if (le32_to_cpu(oext->ee_block) <= new_ext_end &&
509 new_ext_end < le32_to_cpu(oext->ee_block) + oext_alen - 1) {
510 end_ext.ee_len =
511 cpu_to_le16(le32_to_cpu(oext->ee_block) +
512 oext_alen - 1 - new_ext_end);
513 copy_extent_status(oext, &end_ext);
514 end_ext_alen = ext4_ext_get_actual_len(&end_ext);
515 ext4_ext_store_pblock(&end_ext,
516 (ext4_ext_pblock(o_end) + oext_alen - end_ext_alen));
517 end_ext.ee_block =
518 cpu_to_le32(le32_to_cpu(o_end->ee_block) +
519 oext_alen - end_ext_alen);
520 }
521
522 ret = mext_insert_extents(handle, orig_inode, orig_path, o_start,
523 o_end, &start_ext, &new_ext, &end_ext);
524out:
525 return ret;
526}
527
528/**
529 * mext_calc_swap_extents - Calculate extents for extent swapping.
530 *
531 * @tmp_dext: the extent that will belong to the original inode
532 * @tmp_oext: the extent that will belong to the donor inode
533 * @orig_off: block offset of original inode
534 * @donor_off: block offset of donor inode
535 * @max_count: the maximum length of extents
536 *
537 * Return 0 on success, or a negative error value on failure.
538 */
539static int
540mext_calc_swap_extents(struct ext4_extent *tmp_dext,
541 struct ext4_extent *tmp_oext,
542 ext4_lblk_t orig_off, ext4_lblk_t donor_off,
543 ext4_lblk_t max_count)
544{
545 ext4_lblk_t diff, orig_diff;
546 struct ext4_extent dext_old, oext_old;
547
548 BUG_ON(orig_off != donor_off);
549
550 /* original and donor extents have to cover the same block offset */
551 if (orig_off < le32_to_cpu(tmp_oext->ee_block) ||
552 le32_to_cpu(tmp_oext->ee_block) +
553 ext4_ext_get_actual_len(tmp_oext) - 1 < orig_off)
554 return -ENODATA;
555
556 if (orig_off < le32_to_cpu(tmp_dext->ee_block) ||
557 le32_to_cpu(tmp_dext->ee_block) +
558 ext4_ext_get_actual_len(tmp_dext) - 1 < orig_off)
559 return -ENODATA;
560
561 dext_old = *tmp_dext;
562 oext_old = *tmp_oext;
563
564 /* When tmp_dext is too large, pick up the target range. */
565 diff = donor_off - le32_to_cpu(tmp_dext->ee_block);
566
567 ext4_ext_store_pblock(tmp_dext, ext4_ext_pblock(tmp_dext) + diff);
568 le32_add_cpu(&tmp_dext->ee_block, diff);
569 le16_add_cpu(&tmp_dext->ee_len, -diff);
570
571 if (max_count < ext4_ext_get_actual_len(tmp_dext))
572 tmp_dext->ee_len = cpu_to_le16(max_count);
573
574 orig_diff = orig_off - le32_to_cpu(tmp_oext->ee_block);
575 ext4_ext_store_pblock(tmp_oext, ext4_ext_pblock(tmp_oext) + orig_diff);
576
577 /* Adjust extent length if donor extent is larger than orig */
578 if (ext4_ext_get_actual_len(tmp_dext) >
579 ext4_ext_get_actual_len(tmp_oext) - orig_diff)
580 tmp_dext->ee_len = cpu_to_le16(le16_to_cpu(tmp_oext->ee_len) -
581 orig_diff);
582
583 tmp_oext->ee_len = cpu_to_le16(ext4_ext_get_actual_len(tmp_dext));
584
585 copy_extent_status(&oext_old, tmp_dext);
586 copy_extent_status(&dext_old, tmp_oext);
587
588 return 0;
589}
590
591/**
592 * mext_check_coverage - Check that all extents in range has the same type 87 * mext_check_coverage - Check that all extents in range has the same type
593 * 88 *
594 * @inode: inode in question 89 * @inode: inode in question
@@ -619,171 +114,25 @@ mext_check_coverage(struct inode *inode, ext4_lblk_t from, ext4_lblk_t count,
619 } 114 }
620 ret = 1; 115 ret = 1;
621out: 116out:
622 if (path) { 117 ext4_ext_drop_refs(path);
623 ext4_ext_drop_refs(path); 118 kfree(path);
624 kfree(path);
625 }
626 return ret; 119 return ret;
627} 120}
628 121
629/** 122/**
630 * mext_replace_branches - Replace original extents with new extents
631 *
632 * @handle: journal handle
633 * @orig_inode: original inode
634 * @donor_inode: donor inode
635 * @from: block offset of orig_inode
636 * @count: block count to be replaced
637 * @err: pointer to save return value
638 *
639 * Replace original inode extents and donor inode extents page by page.
640 * We implement this replacement in the following three steps:
641 * 1. Save the block information of original and donor inodes into
642 * dummy extents.
643 * 2. Change the block information of original inode to point at the
644 * donor inode blocks.
645 * 3. Change the block information of donor inode to point at the saved
646 * original inode blocks in the dummy extents.
647 *
648 * Return replaced block count.
649 */
650static int
651mext_replace_branches(handle_t *handle, struct inode *orig_inode,
652 struct inode *donor_inode, ext4_lblk_t from,
653 ext4_lblk_t count, int *err)
654{
655 struct ext4_ext_path *orig_path = NULL;
656 struct ext4_ext_path *donor_path = NULL;
657 struct ext4_extent *oext, *dext;
658 struct ext4_extent tmp_dext, tmp_oext;
659 ext4_lblk_t orig_off = from, donor_off = from;
660 int depth;
661 int replaced_count = 0;
662 int dext_alen;
663
664 *err = ext4_es_remove_extent(orig_inode, from, count);
665 if (*err)
666 goto out;
667
668 *err = ext4_es_remove_extent(donor_inode, from, count);
669 if (*err)
670 goto out;
671
672 /* Get the original extent for the block "orig_off" */
673 *err = get_ext_path(orig_inode, orig_off, &orig_path);
674 if (*err)
675 goto out;
676
677 /* Get the donor extent for the head */
678 *err = get_ext_path(donor_inode, donor_off, &donor_path);
679 if (*err)
680 goto out;
681 depth = ext_depth(orig_inode);
682 oext = orig_path[depth].p_ext;
683 tmp_oext = *oext;
684
685 depth = ext_depth(donor_inode);
686 dext = donor_path[depth].p_ext;
687 if (unlikely(!dext))
688 goto missing_donor_extent;
689 tmp_dext = *dext;
690
691 *err = mext_calc_swap_extents(&tmp_dext, &tmp_oext, orig_off,
692 donor_off, count);
693 if (*err)
694 goto out;
695
696 /* Loop for the donor extents */
697 while (1) {
698 /* The extent for donor must be found. */
699 if (unlikely(!dext)) {
700 missing_donor_extent:
701 EXT4_ERROR_INODE(donor_inode,
702 "The extent for donor must be found");
703 *err = -EIO;
704 goto out;
705 } else if (donor_off != le32_to_cpu(tmp_dext.ee_block)) {
706 EXT4_ERROR_INODE(donor_inode,
707 "Donor offset(%u) and the first block of donor "
708 "extent(%u) should be equal",
709 donor_off,
710 le32_to_cpu(tmp_dext.ee_block));
711 *err = -EIO;
712 goto out;
713 }
714
715 /* Set donor extent to orig extent */
716 *err = mext_leaf_block(handle, orig_inode,
717 orig_path, &tmp_dext, &orig_off);
718 if (*err)
719 goto out;
720
721 /* Set orig extent to donor extent */
722 *err = mext_leaf_block(handle, donor_inode,
723 donor_path, &tmp_oext, &donor_off);
724 if (*err)
725 goto out;
726
727 dext_alen = ext4_ext_get_actual_len(&tmp_dext);
728 replaced_count += dext_alen;
729 donor_off += dext_alen;
730 orig_off += dext_alen;
731
732 BUG_ON(replaced_count > count);
733 /* Already moved the expected blocks */
734 if (replaced_count >= count)
735 break;
736
737 if (orig_path)
738 ext4_ext_drop_refs(orig_path);
739 *err = get_ext_path(orig_inode, orig_off, &orig_path);
740 if (*err)
741 goto out;
742 depth = ext_depth(orig_inode);
743 oext = orig_path[depth].p_ext;
744 tmp_oext = *oext;
745
746 if (donor_path)
747 ext4_ext_drop_refs(donor_path);
748 *err = get_ext_path(donor_inode, donor_off, &donor_path);
749 if (*err)
750 goto out;
751 depth = ext_depth(donor_inode);
752 dext = donor_path[depth].p_ext;
753 tmp_dext = *dext;
754
755 *err = mext_calc_swap_extents(&tmp_dext, &tmp_oext, orig_off,
756 donor_off, count - replaced_count);
757 if (*err)
758 goto out;
759 }
760
761out:
762 if (orig_path) {
763 ext4_ext_drop_refs(orig_path);
764 kfree(orig_path);
765 }
766 if (donor_path) {
767 ext4_ext_drop_refs(donor_path);
768 kfree(donor_path);
769 }
770
771 return replaced_count;
772}
773
774/**
775 * mext_page_double_lock - Grab and lock pages on both @inode1 and @inode2 123 * mext_page_double_lock - Grab and lock pages on both @inode1 and @inode2
776 * 124 *
777 * @inode1: the inode structure 125 * @inode1: the inode structure
778 * @inode2: the inode structure 126 * @inode2: the inode structure
779 * @index: page index 127 * @index1: page index
128 * @index2: page index
780 * @page: result page vector 129 * @page: result page vector
781 * 130 *
782 * Grab two locked pages for inode's by inode order 131 * Grab two locked pages for inode's by inode order
783 */ 132 */
784static int 133static int
785mext_page_double_lock(struct inode *inode1, struct inode *inode2, 134mext_page_double_lock(struct inode *inode1, struct inode *inode2,
786 pgoff_t index, struct page *page[2]) 135 pgoff_t index1, pgoff_t index2, struct page *page[2])
787{ 136{
788 struct address_space *mapping[2]; 137 struct address_space *mapping[2];
789 unsigned fl = AOP_FLAG_NOFS; 138 unsigned fl = AOP_FLAG_NOFS;
@@ -793,15 +142,18 @@ mext_page_double_lock(struct inode *inode1, struct inode *inode2,
793 mapping[0] = inode1->i_mapping; 142 mapping[0] = inode1->i_mapping;
794 mapping[1] = inode2->i_mapping; 143 mapping[1] = inode2->i_mapping;
795 } else { 144 } else {
145 pgoff_t tmp = index1;
146 index1 = index2;
147 index2 = tmp;
796 mapping[0] = inode2->i_mapping; 148 mapping[0] = inode2->i_mapping;
797 mapping[1] = inode1->i_mapping; 149 mapping[1] = inode1->i_mapping;
798 } 150 }
799 151
800 page[0] = grab_cache_page_write_begin(mapping[0], index, fl); 152 page[0] = grab_cache_page_write_begin(mapping[0], index1, fl);
801 if (!page[0]) 153 if (!page[0])
802 return -ENOMEM; 154 return -ENOMEM;
803 155
804 page[1] = grab_cache_page_write_begin(mapping[1], index, fl); 156 page[1] = grab_cache_page_write_begin(mapping[1], index2, fl);
805 if (!page[1]) { 157 if (!page[1]) {
806 unlock_page(page[0]); 158 unlock_page(page[0]);
807 page_cache_release(page[0]); 159 page_cache_release(page[0]);
@@ -893,25 +245,27 @@ out:
893 * @o_filp: file structure of original file 245 * @o_filp: file structure of original file
894 * @donor_inode: donor inode 246 * @donor_inode: donor inode
895 * @orig_page_offset: page index on original file 247 * @orig_page_offset: page index on original file
248 * @donor_page_offset: page index on donor file
896 * @data_offset_in_page: block index where data swapping starts 249 * @data_offset_in_page: block index where data swapping starts
897 * @block_len_in_page: the number of blocks to be swapped 250 * @block_len_in_page: the number of blocks to be swapped
898 * @unwritten: orig extent is unwritten or not 251 * @unwritten: orig extent is unwritten or not
899 * @err: pointer to save return value 252 * @err: pointer to save return value
900 * 253 *
901 * Save the data in original inode blocks and replace original inode extents 254 * Save the data in original inode blocks and replace original inode extents
902 * with donor inode extents by calling mext_replace_branches(). 255 * with donor inode extents by calling ext4_swap_extents().
903 * Finally, write out the saved data in new original inode blocks. Return 256 * Finally, write out the saved data in new original inode blocks. Return
904 * replaced block count. 257 * replaced block count.
905 */ 258 */
906static int 259static int
907move_extent_per_page(struct file *o_filp, struct inode *donor_inode, 260move_extent_per_page(struct file *o_filp, struct inode *donor_inode,
908 pgoff_t orig_page_offset, int data_offset_in_page, 261 pgoff_t orig_page_offset, pgoff_t donor_page_offset,
909 int block_len_in_page, int unwritten, int *err) 262 int data_offset_in_page,
263 int block_len_in_page, int unwritten, int *err)
910{ 264{
911 struct inode *orig_inode = file_inode(o_filp); 265 struct inode *orig_inode = file_inode(o_filp);
912 struct page *pagep[2] = {NULL, NULL}; 266 struct page *pagep[2] = {NULL, NULL};
913 handle_t *handle; 267 handle_t *handle;
914 ext4_lblk_t orig_blk_offset; 268 ext4_lblk_t orig_blk_offset, donor_blk_offset;
915 unsigned long blocksize = orig_inode->i_sb->s_blocksize; 269 unsigned long blocksize = orig_inode->i_sb->s_blocksize;
916 unsigned int w_flags = 0; 270 unsigned int w_flags = 0;
917 unsigned int tmp_data_size, data_size, replaced_size; 271 unsigned int tmp_data_size, data_size, replaced_size;
@@ -939,6 +293,9 @@ again:
939 orig_blk_offset = orig_page_offset * blocks_per_page + 293 orig_blk_offset = orig_page_offset * blocks_per_page +
940 data_offset_in_page; 294 data_offset_in_page;
941 295
296 donor_blk_offset = donor_page_offset * blocks_per_page +
297 data_offset_in_page;
298
942 /* Calculate data_size */ 299 /* Calculate data_size */
943 if ((orig_blk_offset + block_len_in_page - 1) == 300 if ((orig_blk_offset + block_len_in_page - 1) ==
944 ((orig_inode->i_size - 1) >> orig_inode->i_blkbits)) { 301 ((orig_inode->i_size - 1) >> orig_inode->i_blkbits)) {
@@ -959,7 +316,7 @@ again:
959 replaced_size = data_size; 316 replaced_size = data_size;
960 317
961 *err = mext_page_double_lock(orig_inode, donor_inode, orig_page_offset, 318 *err = mext_page_double_lock(orig_inode, donor_inode, orig_page_offset,
962 pagep); 319 donor_page_offset, pagep);
963 if (unlikely(*err < 0)) 320 if (unlikely(*err < 0))
964 goto stop_journal; 321 goto stop_journal;
965 /* 322 /*
@@ -978,7 +335,7 @@ again:
978 if (*err) 335 if (*err)
979 goto drop_data_sem; 336 goto drop_data_sem;
980 337
981 unwritten &= mext_check_coverage(donor_inode, orig_blk_offset, 338 unwritten &= mext_check_coverage(donor_inode, donor_blk_offset,
982 block_len_in_page, 1, err); 339 block_len_in_page, 1, err);
983 if (*err) 340 if (*err)
984 goto drop_data_sem; 341 goto drop_data_sem;
@@ -994,9 +351,10 @@ again:
994 *err = -EBUSY; 351 *err = -EBUSY;
995 goto drop_data_sem; 352 goto drop_data_sem;
996 } 353 }
997 replaced_count = mext_replace_branches(handle, orig_inode, 354 replaced_count = ext4_swap_extents(handle, orig_inode,
998 donor_inode, orig_blk_offset, 355 donor_inode, orig_blk_offset,
999 block_len_in_page, err); 356 donor_blk_offset,
357 block_len_in_page, 1, err);
1000 drop_data_sem: 358 drop_data_sem:
1001 ext4_double_up_write_data_sem(orig_inode, donor_inode); 359 ext4_double_up_write_data_sem(orig_inode, donor_inode);
1002 goto unlock_pages; 360 goto unlock_pages;
@@ -1014,9 +372,9 @@ data_copy:
1014 goto unlock_pages; 372 goto unlock_pages;
1015 } 373 }
1016 ext4_double_down_write_data_sem(orig_inode, donor_inode); 374 ext4_double_down_write_data_sem(orig_inode, donor_inode);
1017 replaced_count = mext_replace_branches(handle, orig_inode, donor_inode, 375 replaced_count = ext4_swap_extents(handle, orig_inode, donor_inode,
1018 orig_blk_offset, 376 orig_blk_offset, donor_blk_offset,
1019 block_len_in_page, err); 377 block_len_in_page, 1, err);
1020 ext4_double_up_write_data_sem(orig_inode, donor_inode); 378 ext4_double_up_write_data_sem(orig_inode, donor_inode);
1021 if (*err) { 379 if (*err) {
1022 if (replaced_count) { 380 if (replaced_count) {
@@ -1061,9 +419,9 @@ repair_branches:
1061 * Try to swap extents to it's original places 419 * Try to swap extents to it's original places
1062 */ 420 */
1063 ext4_double_down_write_data_sem(orig_inode, donor_inode); 421 ext4_double_down_write_data_sem(orig_inode, donor_inode);
1064 replaced_count = mext_replace_branches(handle, donor_inode, orig_inode, 422 replaced_count = ext4_swap_extents(handle, donor_inode, orig_inode,
1065 orig_blk_offset, 423 orig_blk_offset, donor_blk_offset,
1066 block_len_in_page, &err2); 424 block_len_in_page, 0, &err2);
1067 ext4_double_up_write_data_sem(orig_inode, donor_inode); 425 ext4_double_up_write_data_sem(orig_inode, donor_inode);
1068 if (replaced_count != block_len_in_page) { 426 if (replaced_count != block_len_in_page) {
1069 EXT4_ERROR_INODE_BLOCK(orig_inode, (sector_t)(orig_blk_offset), 427 EXT4_ERROR_INODE_BLOCK(orig_inode, (sector_t)(orig_blk_offset),
@@ -1093,10 +451,14 @@ mext_check_arguments(struct inode *orig_inode,
1093 struct inode *donor_inode, __u64 orig_start, 451 struct inode *donor_inode, __u64 orig_start,
1094 __u64 donor_start, __u64 *len) 452 __u64 donor_start, __u64 *len)
1095{ 453{
1096 ext4_lblk_t orig_blocks, donor_blocks; 454 __u64 orig_eof, donor_eof;
1097 unsigned int blkbits = orig_inode->i_blkbits; 455 unsigned int blkbits = orig_inode->i_blkbits;
1098 unsigned int blocksize = 1 << blkbits; 456 unsigned int blocksize = 1 << blkbits;
1099 457
458 orig_eof = (i_size_read(orig_inode) + blocksize - 1) >> blkbits;
459 donor_eof = (i_size_read(donor_inode) + blocksize - 1) >> blkbits;
460
461
1100 if (donor_inode->i_mode & (S_ISUID|S_ISGID)) { 462 if (donor_inode->i_mode & (S_ISUID|S_ISGID)) {
1101 ext4_debug("ext4 move extent: suid or sgid is set" 463 ext4_debug("ext4 move extent: suid or sgid is set"
1102 " to donor file [ino:orig %lu, donor %lu]\n", 464 " to donor file [ino:orig %lu, donor %lu]\n",
@@ -1112,7 +474,7 @@ mext_check_arguments(struct inode *orig_inode,
1112 ext4_debug("ext4 move extent: The argument files should " 474 ext4_debug("ext4 move extent: The argument files should "
1113 "not be swapfile [ino:orig %lu, donor %lu]\n", 475 "not be swapfile [ino:orig %lu, donor %lu]\n",
1114 orig_inode->i_ino, donor_inode->i_ino); 476 orig_inode->i_ino, donor_inode->i_ino);
1115 return -EINVAL; 477 return -EBUSY;
1116 } 478 }
1117 479
1118 /* Ext4 move extent supports only extent based file */ 480 /* Ext4 move extent supports only extent based file */
@@ -1132,67 +494,28 @@ mext_check_arguments(struct inode *orig_inode,
1132 } 494 }
1133 495
1134 /* Start offset should be same */ 496 /* Start offset should be same */
1135 if (orig_start != donor_start) { 497 if ((orig_start & ~(PAGE_MASK >> orig_inode->i_blkbits)) !=
498 (donor_start & ~(PAGE_MASK >> orig_inode->i_blkbits))) {
1136 ext4_debug("ext4 move extent: orig and donor's start " 499 ext4_debug("ext4 move extent: orig and donor's start "
1137 "offset are not same [ino:orig %lu, donor %lu]\n", 500 "offset are not alligned [ino:orig %lu, donor %lu]\n",
1138 orig_inode->i_ino, donor_inode->i_ino); 501 orig_inode->i_ino, donor_inode->i_ino);
1139 return -EINVAL; 502 return -EINVAL;
1140 } 503 }
1141 504
1142 if ((orig_start >= EXT_MAX_BLOCKS) || 505 if ((orig_start >= EXT_MAX_BLOCKS) ||
506 (donor_start >= EXT_MAX_BLOCKS) ||
1143 (*len > EXT_MAX_BLOCKS) || 507 (*len > EXT_MAX_BLOCKS) ||
508 (donor_start + *len >= EXT_MAX_BLOCKS) ||
1144 (orig_start + *len >= EXT_MAX_BLOCKS)) { 509 (orig_start + *len >= EXT_MAX_BLOCKS)) {
1145 ext4_debug("ext4 move extent: Can't handle over [%u] blocks " 510 ext4_debug("ext4 move extent: Can't handle over [%u] blocks "
1146 "[ino:orig %lu, donor %lu]\n", EXT_MAX_BLOCKS, 511 "[ino:orig %lu, donor %lu]\n", EXT_MAX_BLOCKS,
1147 orig_inode->i_ino, donor_inode->i_ino); 512 orig_inode->i_ino, donor_inode->i_ino);
1148 return -EINVAL; 513 return -EINVAL;
1149 } 514 }
1150 515 if (orig_eof < orig_start + *len - 1)
1151 if (orig_inode->i_size > donor_inode->i_size) { 516 *len = orig_eof - orig_start;
1152 donor_blocks = (donor_inode->i_size + blocksize - 1) >> blkbits; 517 if (donor_eof < donor_start + *len - 1)
1153 /* TODO: eliminate this artificial restriction */ 518 *len = donor_eof - donor_start;
1154 if (orig_start >= donor_blocks) {
1155 ext4_debug("ext4 move extent: orig start offset "
1156 "[%llu] should be less than donor file blocks "
1157 "[%u] [ino:orig %lu, donor %lu]\n",
1158 orig_start, donor_blocks,
1159 orig_inode->i_ino, donor_inode->i_ino);
1160 return -EINVAL;
1161 }
1162
1163 /* TODO: eliminate this artificial restriction */
1164 if (orig_start + *len > donor_blocks) {
1165 ext4_debug("ext4 move extent: End offset [%llu] should "
1166 "be less than donor file blocks [%u]."
1167 "So adjust length from %llu to %llu "
1168 "[ino:orig %lu, donor %lu]\n",
1169 orig_start + *len, donor_blocks,
1170 *len, donor_blocks - orig_start,
1171 orig_inode->i_ino, donor_inode->i_ino);
1172 *len = donor_blocks - orig_start;
1173 }
1174 } else {
1175 orig_blocks = (orig_inode->i_size + blocksize - 1) >> blkbits;
1176 if (orig_start >= orig_blocks) {
1177 ext4_debug("ext4 move extent: start offset [%llu] "
1178 "should be less than original file blocks "
1179 "[%u] [ino:orig %lu, donor %lu]\n",
1180 orig_start, orig_blocks,
1181 orig_inode->i_ino, donor_inode->i_ino);
1182 return -EINVAL;
1183 }
1184
1185 if (orig_start + *len > orig_blocks) {
1186 ext4_debug("ext4 move extent: Adjust length "
1187 "from %llu to %llu. Because it should be "
1188 "less than original file blocks "
1189 "[ino:orig %lu, donor %lu]\n",
1190 *len, orig_blocks - orig_start,
1191 orig_inode->i_ino, donor_inode->i_ino);
1192 *len = orig_blocks - orig_start;
1193 }
1194 }
1195
1196 if (!*len) { 519 if (!*len) {
1197 ext4_debug("ext4 move extent: len should not be 0 " 520 ext4_debug("ext4 move extent: len should not be 0 "
1198 "[ino:orig %lu, donor %lu]\n", orig_inode->i_ino, 521 "[ino:orig %lu, donor %lu]\n", orig_inode->i_ino,
@@ -1208,60 +531,26 @@ mext_check_arguments(struct inode *orig_inode,
1208 * 531 *
1209 * @o_filp: file structure of the original file 532 * @o_filp: file structure of the original file
1210 * @d_filp: file structure of the donor file 533 * @d_filp: file structure of the donor file
1211 * @orig_start: start offset in block for orig 534 * @orig_blk: start offset in block for orig
1212 * @donor_start: start offset in block for donor 535 * @donor_blk: start offset in block for donor
1213 * @len: the number of blocks to be moved 536 * @len: the number of blocks to be moved
1214 * @moved_len: moved block length 537 * @moved_len: moved block length
1215 * 538 *
1216 * This function returns 0 and moved block length is set in moved_len 539 * This function returns 0 and moved block length is set in moved_len
1217 * if succeed, otherwise returns error value. 540 * if succeed, otherwise returns error value.
1218 * 541 *
1219 * Note: ext4_move_extents() proceeds the following order.
1220 * 1:ext4_move_extents() calculates the last block number of moving extent
1221 * function by the start block number (orig_start) and the number of blocks
1222 * to be moved (len) specified as arguments.
1223 * If the {orig, donor}_start points a hole, the extent's start offset
1224 * pointed by ext_cur (current extent), holecheck_path, orig_path are set
1225 * after hole behind.
1226 * 2:Continue step 3 to step 5, until the holecheck_path points to last_extent
1227 * or the ext_cur exceeds the block_end which is last logical block number.
1228 * 3:To get the length of continues area, call mext_next_extent()
1229 * specified with the ext_cur (initial value is holecheck_path) re-cursive,
1230 * until find un-continuous extent, the start logical block number exceeds
1231 * the block_end or the extent points to the last extent.
1232 * 4:Exchange the original inode data with donor inode data
1233 * from orig_page_offset to seq_end_page.
1234 * The start indexes of data are specified as arguments.
1235 * That of the original inode is orig_page_offset,
1236 * and the donor inode is also orig_page_offset
1237 * (To easily handle blocksize != pagesize case, the offset for the
1238 * donor inode is block unit).
1239 * 5:Update holecheck_path and orig_path to points a next proceeding extent,
1240 * then returns to step 2.
1241 * 6:Release holecheck_path, orig_path and set the len to moved_len
1242 * which shows the number of moved blocks.
1243 * The moved_len is useful for the command to calculate the file offset
1244 * for starting next move extent ioctl.
1245 * 7:Return 0 on success, or a negative error value on failure.
1246 */ 542 */
1247int 543int
1248ext4_move_extents(struct file *o_filp, struct file *d_filp, 544ext4_move_extents(struct file *o_filp, struct file *d_filp, __u64 orig_blk,
1249 __u64 orig_start, __u64 donor_start, __u64 len, 545 __u64 donor_blk, __u64 len, __u64 *moved_len)
1250 __u64 *moved_len)
1251{ 546{
1252 struct inode *orig_inode = file_inode(o_filp); 547 struct inode *orig_inode = file_inode(o_filp);
1253 struct inode *donor_inode = file_inode(d_filp); 548 struct inode *donor_inode = file_inode(d_filp);
1254 struct ext4_ext_path *orig_path = NULL, *holecheck_path = NULL; 549 struct ext4_ext_path *path = NULL;
1255 struct ext4_extent *ext_prev, *ext_cur, *ext_dummy;
1256 ext4_lblk_t block_start = orig_start;
1257 ext4_lblk_t block_end, seq_start, add_blocks, file_end, seq_blocks = 0;
1258 ext4_lblk_t rest_blocks;
1259 pgoff_t orig_page_offset = 0, seq_end_page;
1260 int ret, depth, last_extent = 0;
1261 int blocks_per_page = PAGE_CACHE_SIZE >> orig_inode->i_blkbits; 550 int blocks_per_page = PAGE_CACHE_SIZE >> orig_inode->i_blkbits;
1262 int data_offset_in_page; 551 ext4_lblk_t o_end, o_start = orig_blk;
1263 int block_len_in_page; 552 ext4_lblk_t d_start = donor_blk;
1264 int unwritten; 553 int ret;
1265 554
1266 if (orig_inode->i_sb != donor_inode->i_sb) { 555 if (orig_inode->i_sb != donor_inode->i_sb) {
1267 ext4_debug("ext4 move extent: The argument files " 556 ext4_debug("ext4 move extent: The argument files "
@@ -1303,121 +592,58 @@ ext4_move_extents(struct file *o_filp, struct file *d_filp,
1303 /* Protect extent tree against block allocations via delalloc */ 592 /* Protect extent tree against block allocations via delalloc */
1304 ext4_double_down_write_data_sem(orig_inode, donor_inode); 593 ext4_double_down_write_data_sem(orig_inode, donor_inode);
1305 /* Check the filesystem environment whether move_extent can be done */ 594 /* Check the filesystem environment whether move_extent can be done */
1306 ret = mext_check_arguments(orig_inode, donor_inode, orig_start, 595 ret = mext_check_arguments(orig_inode, donor_inode, orig_blk,
1307 donor_start, &len); 596 donor_blk, &len);
1308 if (ret) 597 if (ret)
1309 goto out; 598 goto out;
599 o_end = o_start + len;
1310 600
1311 file_end = (i_size_read(orig_inode) - 1) >> orig_inode->i_blkbits; 601 while (o_start < o_end) {
1312 block_end = block_start + len - 1; 602 struct ext4_extent *ex;
1313 if (file_end < block_end) 603 ext4_lblk_t cur_blk, next_blk;
1314 len -= block_end - file_end; 604 pgoff_t orig_page_index, donor_page_index;
605 int offset_in_page;
606 int unwritten, cur_len;
1315 607
1316 ret = get_ext_path(orig_inode, block_start, &orig_path); 608 ret = get_ext_path(orig_inode, o_start, &path);
1317 if (ret) 609 if (ret)
1318 goto out;
1319
1320 /* Get path structure to check the hole */
1321 ret = get_ext_path(orig_inode, block_start, &holecheck_path);
1322 if (ret)
1323 goto out;
1324
1325 depth = ext_depth(orig_inode);
1326 ext_cur = holecheck_path[depth].p_ext;
1327
1328 /*
1329 * Get proper starting location of block replacement if block_start was
1330 * within the hole.
1331 */
1332 if (le32_to_cpu(ext_cur->ee_block) +
1333 ext4_ext_get_actual_len(ext_cur) - 1 < block_start) {
1334 /*
1335 * The hole exists between extents or the tail of
1336 * original file.
1337 */
1338 last_extent = mext_next_extent(orig_inode,
1339 holecheck_path, &ext_cur);
1340 if (last_extent < 0) {
1341 ret = last_extent;
1342 goto out;
1343 }
1344 last_extent = mext_next_extent(orig_inode, orig_path,
1345 &ext_dummy);
1346 if (last_extent < 0) {
1347 ret = last_extent;
1348 goto out; 610 goto out;
1349 } 611 ex = path[path->p_depth].p_ext;
1350 seq_start = le32_to_cpu(ext_cur->ee_block); 612 next_blk = ext4_ext_next_allocated_block(path);
1351 } else if (le32_to_cpu(ext_cur->ee_block) > block_start) 613 cur_blk = le32_to_cpu(ex->ee_block);
1352 /* The hole exists at the beginning of original file. */ 614 cur_len = ext4_ext_get_actual_len(ex);
1353 seq_start = le32_to_cpu(ext_cur->ee_block); 615 /* Check hole before the start pos */
1354 else 616 if (cur_blk + cur_len - 1 < o_start) {
1355 seq_start = block_start; 617 if (next_blk == EXT_MAX_BLOCKS) {
1356 618 o_start = o_end;
1357 /* No blocks within the specified range. */ 619 ret = -ENODATA;
1358 if (le32_to_cpu(ext_cur->ee_block) > block_end) { 620 goto out;
1359 ext4_debug("ext4 move extent: The specified range of file " 621 }
1360 "may be the hole\n"); 622 d_start += next_blk - o_start;
1361 ret = -EINVAL; 623 o_start = next_blk;
1362 goto out;
1363 }
1364
1365 /* Adjust start blocks */
1366 add_blocks = min(le32_to_cpu(ext_cur->ee_block) +
1367 ext4_ext_get_actual_len(ext_cur), block_end + 1) -
1368 max(le32_to_cpu(ext_cur->ee_block), block_start);
1369
1370 while (!last_extent && le32_to_cpu(ext_cur->ee_block) <= block_end) {
1371 seq_blocks += add_blocks;
1372
1373 /* Adjust tail blocks */
1374 if (seq_start + seq_blocks - 1 > block_end)
1375 seq_blocks = block_end - seq_start + 1;
1376
1377 ext_prev = ext_cur;
1378 last_extent = mext_next_extent(orig_inode, holecheck_path,
1379 &ext_cur);
1380 if (last_extent < 0) {
1381 ret = last_extent;
1382 break;
1383 }
1384 add_blocks = ext4_ext_get_actual_len(ext_cur);
1385
1386 /*
1387 * Extend the length of contiguous block (seq_blocks)
1388 * if extents are contiguous.
1389 */
1390 if (ext4_can_extents_be_merged(orig_inode,
1391 ext_prev, ext_cur) &&
1392 block_end >= le32_to_cpu(ext_cur->ee_block) &&
1393 !last_extent)
1394 continue; 624 continue;
1395 625 /* Check hole after the start pos */
1396 /* Is original extent is unwritten */ 626 } else if (cur_blk > o_start) {
1397 unwritten = ext4_ext_is_unwritten(ext_prev); 627 /* Skip hole */
1398 628 d_start += cur_blk - o_start;
1399 data_offset_in_page = seq_start % blocks_per_page; 629 o_start = cur_blk;
1400 630 /* Extent inside requested range ?*/
1401 /* 631 if (cur_blk >= o_end)
1402 * Calculate data blocks count that should be swapped 632 goto out;
1403 * at the first page. 633 } else { /* in_range(o_start, o_blk, o_len) */
1404 */ 634 cur_len += cur_blk - o_start;
1405 if (data_offset_in_page + seq_blocks > blocks_per_page) {
1406 /* Swapped blocks are across pages */
1407 block_len_in_page =
1408 blocks_per_page - data_offset_in_page;
1409 } else {
1410 /* Swapped blocks are in a page */
1411 block_len_in_page = seq_blocks;
1412 } 635 }
1413 636 unwritten = ext4_ext_is_unwritten(ex);
1414 orig_page_offset = seq_start >> 637 if (o_end - o_start < cur_len)
1415 (PAGE_CACHE_SHIFT - orig_inode->i_blkbits); 638 cur_len = o_end - o_start;
1416 seq_end_page = (seq_start + seq_blocks - 1) >> 639
1417 (PAGE_CACHE_SHIFT - orig_inode->i_blkbits); 640 orig_page_index = o_start >> (PAGE_CACHE_SHIFT -
1418 seq_start = le32_to_cpu(ext_cur->ee_block); 641 orig_inode->i_blkbits);
1419 rest_blocks = seq_blocks; 642 donor_page_index = d_start >> (PAGE_CACHE_SHIFT -
1420 643 donor_inode->i_blkbits);
644 offset_in_page = o_start % blocks_per_page;
645 if (cur_len > blocks_per_page- offset_in_page)
646 cur_len = blocks_per_page - offset_in_page;
1421 /* 647 /*
1422 * Up semaphore to avoid following problems: 648 * Up semaphore to avoid following problems:
1423 * a. transaction deadlock among ext4_journal_start, 649 * a. transaction deadlock among ext4_journal_start,
@@ -1426,77 +652,29 @@ ext4_move_extents(struct file *o_filp, struct file *d_filp,
1426 * in move_extent_per_page 652 * in move_extent_per_page
1427 */ 653 */
1428 ext4_double_up_write_data_sem(orig_inode, donor_inode); 654 ext4_double_up_write_data_sem(orig_inode, donor_inode);
1429 655 /* Swap original branches with new branches */
1430 while (orig_page_offset <= seq_end_page) { 656 move_extent_per_page(o_filp, donor_inode,
1431 657 orig_page_index, donor_page_index,
1432 /* Swap original branches with new branches */ 658 offset_in_page, cur_len,
1433 block_len_in_page = move_extent_per_page( 659 unwritten, &ret);
1434 o_filp, donor_inode,
1435 orig_page_offset,
1436 data_offset_in_page,
1437 block_len_in_page,
1438 unwritten, &ret);
1439
1440 /* Count how many blocks we have exchanged */
1441 *moved_len += block_len_in_page;
1442 if (ret < 0)
1443 break;
1444 if (*moved_len > len) {
1445 EXT4_ERROR_INODE(orig_inode,
1446 "We replaced blocks too much! "
1447 "sum of replaced: %llu requested: %llu",
1448 *moved_len, len);
1449 ret = -EIO;
1450 break;
1451 }
1452
1453 orig_page_offset++;
1454 data_offset_in_page = 0;
1455 rest_blocks -= block_len_in_page;
1456 if (rest_blocks > blocks_per_page)
1457 block_len_in_page = blocks_per_page;
1458 else
1459 block_len_in_page = rest_blocks;
1460 }
1461
1462 ext4_double_down_write_data_sem(orig_inode, donor_inode); 660 ext4_double_down_write_data_sem(orig_inode, donor_inode);
1463 if (ret < 0) 661 if (ret < 0)
1464 break; 662 break;
1465 663 o_start += cur_len;
1466 /* Decrease buffer counter */ 664 d_start += cur_len;
1467 if (holecheck_path)
1468 ext4_ext_drop_refs(holecheck_path);
1469 ret = get_ext_path(orig_inode, seq_start, &holecheck_path);
1470 if (ret)
1471 break;
1472 depth = holecheck_path->p_depth;
1473
1474 /* Decrease buffer counter */
1475 if (orig_path)
1476 ext4_ext_drop_refs(orig_path);
1477 ret = get_ext_path(orig_inode, seq_start, &orig_path);
1478 if (ret)
1479 break;
1480
1481 ext_cur = holecheck_path[depth].p_ext;
1482 add_blocks = ext4_ext_get_actual_len(ext_cur);
1483 seq_blocks = 0;
1484
1485 } 665 }
666 *moved_len = o_start - orig_blk;
667 if (*moved_len > len)
668 *moved_len = len;
669
1486out: 670out:
1487 if (*moved_len) { 671 if (*moved_len) {
1488 ext4_discard_preallocations(orig_inode); 672 ext4_discard_preallocations(orig_inode);
1489 ext4_discard_preallocations(donor_inode); 673 ext4_discard_preallocations(donor_inode);
1490 } 674 }
1491 675
1492 if (orig_path) { 676 ext4_ext_drop_refs(path);
1493 ext4_ext_drop_refs(orig_path); 677 kfree(path);
1494 kfree(orig_path);
1495 }
1496 if (holecheck_path) {
1497 ext4_ext_drop_refs(holecheck_path);
1498 kfree(holecheck_path);
1499 }
1500 ext4_double_up_write_data_sem(orig_inode, donor_inode); 678 ext4_double_up_write_data_sem(orig_inode, donor_inode);
1501 ext4_inode_resume_unlocked_dio(orig_inode); 679 ext4_inode_resume_unlocked_dio(orig_inode);
1502 ext4_inode_resume_unlocked_dio(donor_inode); 680 ext4_inode_resume_unlocked_dio(donor_inode);
generated by cgit v1.2.2 (git 2.25.0) at 2025-06-02 15:53:18 -0400