1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * move_extents.c
4 *
5 * Copyright (C) 2011 Oracle. All rights reserved.
6 */
7 #include <linux/fs.h>
8 #include <linux/types.h>
9 #include <linux/mount.h>
10 #include <linux/swap.h>
11
12 #include <cluster/masklog.h>
13
14 #include "ocfs2.h"
15 #include "ocfs2_ioctl.h"
16
17 #include "alloc.h"
18 #include "localalloc.h"
19 #include "aops.h"
20 #include "dlmglue.h"
21 #include "extent_map.h"
22 #include "inode.h"
23 #include "journal.h"
24 #include "suballoc.h"
25 #include "uptodate.h"
26 #include "super.h"
27 #include "dir.h"
28 #include "buffer_head_io.h"
29 #include "sysfile.h"
30 #include "refcounttree.h"
31 #include "move_extents.h"
32
33 struct ocfs2_move_extents_context {
34 struct inode *inode;
35 struct file *file;
36 int auto_defrag;
37 int partial;
38 int credits;
39 u32 new_phys_cpos;
40 u32 clusters_moved;
41 u64 refcount_loc;
42 struct ocfs2_move_extents *range;
43 struct ocfs2_extent_tree et;
44 struct ocfs2_alloc_context *meta_ac;
45 struct ocfs2_alloc_context *data_ac;
46 struct ocfs2_cached_dealloc_ctxt dealloc;
47 };
48
__ocfs2_move_extent(handle_t * handle,struct ocfs2_move_extents_context * context,u32 cpos,u32 len,u32 p_cpos,u32 new_p_cpos,int ext_flags)49 static int __ocfs2_move_extent(handle_t *handle,
50 struct ocfs2_move_extents_context *context,
51 u32 cpos, u32 len, u32 p_cpos, u32 new_p_cpos,
52 int ext_flags)
53 {
54 int ret = 0, index;
55 struct inode *inode = context->inode;
56 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
57 struct ocfs2_extent_rec *rec, replace_rec;
58 struct ocfs2_path *path = NULL;
59 struct ocfs2_extent_list *el;
60 u64 ino = ocfs2_metadata_cache_owner(context->et.et_ci);
61 u64 old_blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cpos);
62
63 ret = ocfs2_duplicate_clusters_by_page(handle, inode, cpos,
64 p_cpos, new_p_cpos, len);
65 if (ret) {
66 mlog_errno(ret);
67 goto out;
68 }
69
70 memset(&replace_rec, 0, sizeof(replace_rec));
71 replace_rec.e_cpos = cpu_to_le32(cpos);
72 replace_rec.e_leaf_clusters = cpu_to_le16(len);
73 replace_rec.e_blkno = cpu_to_le64(ocfs2_clusters_to_blocks(inode->i_sb,
74 new_p_cpos));
75
76 path = ocfs2_new_path_from_et(&context->et);
77 if (!path) {
78 ret = -ENOMEM;
79 mlog_errno(ret);
80 goto out;
81 }
82
83 ret = ocfs2_find_path(INODE_CACHE(inode), path, cpos);
84 if (ret) {
85 mlog_errno(ret);
86 goto out;
87 }
88
89 el = path_leaf_el(path);
90
91 index = ocfs2_search_extent_list(el, cpos);
92 if (index == -1) {
93 ret = ocfs2_error(inode->i_sb,
94 "Inode %llu has an extent at cpos %u which can no longer be found\n",
95 (unsigned long long)ino, cpos);
96 goto out;
97 }
98
99 rec = &el->l_recs[index];
100
101 if (ext_flags != rec->e_flags) {
102 ret = ocfs2_error(inode->i_sb,
103 "Inode %llu has corrupted extent %d with flags 0x%x at cpos %u\n",
104 (unsigned long long)ino, index, rec->e_flags, cpos);
105 goto out;
106 }
107
108 /*
109 * after moving/defraging to new location, the extent is not going
110 * to be refcounted anymore.
111 */
112 replace_rec.e_flags = ext_flags & ~OCFS2_EXT_REFCOUNTED;
113
114 ret = ocfs2_split_extent(handle, &context->et, path, index,
115 &replace_rec, context->meta_ac,
116 &context->dealloc);
117 if (ret) {
118 mlog_errno(ret);
119 goto out;
120 }
121
122 context->new_phys_cpos = new_p_cpos;
123
124 /*
125 * need I to append truncate log for old clusters?
126 */
127 if (old_blkno) {
128 if (ext_flags & OCFS2_EXT_REFCOUNTED)
129 ret = ocfs2_decrease_refcount(inode, handle,
130 ocfs2_blocks_to_clusters(osb->sb,
131 old_blkno),
132 len, context->meta_ac,
133 &context->dealloc, 1);
134 else
135 ret = ocfs2_truncate_log_append(osb, handle,
136 old_blkno, len);
137 }
138
139 ocfs2_update_inode_fsync_trans(handle, inode, 0);
140 out:
141 ocfs2_free_path(path);
142 return ret;
143 }
144
145 /*
146 * lock allocator, and reserve appropriate number of bits for
147 * meta blocks.
148 */
ocfs2_lock_meta_allocator_move_extents(struct inode * inode,struct ocfs2_extent_tree * et,u32 clusters_to_move,u32 extents_to_split,struct ocfs2_alloc_context ** meta_ac,int extra_blocks,int * credits)149 static int ocfs2_lock_meta_allocator_move_extents(struct inode *inode,
150 struct ocfs2_extent_tree *et,
151 u32 clusters_to_move,
152 u32 extents_to_split,
153 struct ocfs2_alloc_context **meta_ac,
154 int extra_blocks,
155 int *credits)
156 {
157 int ret, num_free_extents;
158 unsigned int max_recs_needed = 2 * extents_to_split + clusters_to_move;
159 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
160
161 num_free_extents = ocfs2_num_free_extents(et);
162 if (num_free_extents < 0) {
163 ret = num_free_extents;
164 mlog_errno(ret);
165 goto out;
166 }
167
168 if (!num_free_extents ||
169 (ocfs2_sparse_alloc(osb) && num_free_extents < max_recs_needed))
170 extra_blocks += ocfs2_extend_meta_needed(et->et_root_el);
171
172 ret = ocfs2_reserve_new_metadata_blocks(osb, extra_blocks, meta_ac);
173 if (ret) {
174 mlog_errno(ret);
175 goto out;
176 }
177
178
179 *credits += ocfs2_calc_extend_credits(osb->sb, et->et_root_el);
180
181 mlog(0, "reserve metadata_blocks: %d, data_clusters: %u, credits: %d\n",
182 extra_blocks, clusters_to_move, *credits);
183 out:
184 if (ret) {
185 if (*meta_ac) {
186 ocfs2_free_alloc_context(*meta_ac);
187 *meta_ac = NULL;
188 }
189 }
190
191 return ret;
192 }
193
194 /*
195 * Using one journal handle to guarantee the data consistency in case
196 * crash happens anywhere.
197 *
198 * XXX: defrag can end up with finishing partial extent as requested,
199 * due to not enough contiguous clusters can be found in allocator.
200 */
ocfs2_defrag_extent(struct ocfs2_move_extents_context * context,u32 cpos,u32 phys_cpos,u32 * len,int ext_flags)201 static int ocfs2_defrag_extent(struct ocfs2_move_extents_context *context,
202 u32 cpos, u32 phys_cpos, u32 *len, int ext_flags)
203 {
204 int ret, credits = 0, extra_blocks = 0, partial = context->partial;
205 handle_t *handle;
206 struct inode *inode = context->inode;
207 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
208 struct inode *tl_inode = osb->osb_tl_inode;
209 struct ocfs2_refcount_tree *ref_tree = NULL;
210 u32 new_phys_cpos, new_len;
211 u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
212 int need_free = 0;
213
214 if ((ext_flags & OCFS2_EXT_REFCOUNTED) && *len) {
215 BUG_ON(!ocfs2_is_refcount_inode(inode));
216 BUG_ON(!context->refcount_loc);
217
218 ret = ocfs2_lock_refcount_tree(osb, context->refcount_loc, 1,
219 &ref_tree, NULL);
220 if (ret) {
221 mlog_errno(ret);
222 return ret;
223 }
224
225 ret = ocfs2_prepare_refcount_change_for_del(inode,
226 context->refcount_loc,
227 phys_blkno,
228 *len,
229 &credits,
230 &extra_blocks);
231 if (ret) {
232 mlog_errno(ret);
233 goto out;
234 }
235 }
236
237 ret = ocfs2_lock_meta_allocator_move_extents(inode, &context->et,
238 *len, 1,
239 &context->meta_ac,
240 extra_blocks, &credits);
241 if (ret) {
242 mlog_errno(ret);
243 goto out;
244 }
245
246 /*
247 * should be using allocation reservation strategy there?
248 *
249 * if (context->data_ac)
250 * context->data_ac->ac_resv = &OCFS2_I(inode)->ip_la_data_resv;
251 */
252
253 inode_lock(tl_inode);
254
255 if (ocfs2_truncate_log_needs_flush(osb)) {
256 ret = __ocfs2_flush_truncate_log(osb);
257 if (ret < 0) {
258 mlog_errno(ret);
259 goto out_unlock_mutex;
260 }
261 }
262
263 /*
264 * Make sure ocfs2_reserve_cluster is called after
265 * __ocfs2_flush_truncate_log, otherwise, dead lock may happen.
266 *
267 * If ocfs2_reserve_cluster is called
268 * before __ocfs2_flush_truncate_log, dead lock on global bitmap
269 * may happen.
270 *
271 */
272 ret = ocfs2_reserve_clusters(osb, *len, &context->data_ac);
273 if (ret) {
274 mlog_errno(ret);
275 goto out_unlock_mutex;
276 }
277
278 handle = ocfs2_start_trans(osb, credits);
279 if (IS_ERR(handle)) {
280 ret = PTR_ERR(handle);
281 mlog_errno(ret);
282 goto out_unlock_mutex;
283 }
284
285 ret = __ocfs2_claim_clusters(handle, context->data_ac, 1, *len,
286 &new_phys_cpos, &new_len);
287 if (ret) {
288 mlog_errno(ret);
289 goto out_commit;
290 }
291
292 /*
293 * allowing partial extent moving is kind of 'pros and cons', it makes
294 * whole defragmentation less likely to fail, on the contrary, the bad
295 * thing is it may make the fs even more fragmented after moving, let
296 * userspace make a good decision here.
297 */
298 if (new_len != *len) {
299 mlog(0, "len_claimed: %u, len: %u\n", new_len, *len);
300 if (!partial) {
301 context->range->me_flags &= ~OCFS2_MOVE_EXT_FL_COMPLETE;
302 ret = -ENOSPC;
303 need_free = 1;
304 goto out_commit;
305 }
306 }
307
308 mlog(0, "cpos: %u, phys_cpos: %u, new_phys_cpos: %u\n", cpos,
309 phys_cpos, new_phys_cpos);
310
311 ret = __ocfs2_move_extent(handle, context, cpos, new_len, phys_cpos,
312 new_phys_cpos, ext_flags);
313 if (ret)
314 mlog_errno(ret);
315
316 if (partial && (new_len != *len))
317 *len = new_len;
318
319 /*
320 * Here we should write the new page out first if we are
321 * in write-back mode.
322 */
323 ret = ocfs2_cow_sync_writeback(inode->i_sb, context->inode, cpos, *len);
324 if (ret)
325 mlog_errno(ret);
326
327 out_commit:
328 if (need_free && context->data_ac) {
329 struct ocfs2_alloc_context *data_ac = context->data_ac;
330
331 if (context->data_ac->ac_which == OCFS2_AC_USE_LOCAL)
332 ocfs2_free_local_alloc_bits(osb, handle, data_ac,
333 new_phys_cpos, new_len);
334 else
335 ocfs2_free_clusters(handle,
336 data_ac->ac_inode,
337 data_ac->ac_bh,
338 ocfs2_clusters_to_blocks(osb->sb, new_phys_cpos),
339 new_len);
340 }
341
342 ocfs2_commit_trans(osb, handle);
343
344 out_unlock_mutex:
345 inode_unlock(tl_inode);
346
347 if (context->data_ac) {
348 ocfs2_free_alloc_context(context->data_ac);
349 context->data_ac = NULL;
350 }
351
352 if (context->meta_ac) {
353 ocfs2_free_alloc_context(context->meta_ac);
354 context->meta_ac = NULL;
355 }
356
357 out:
358 if (ref_tree)
359 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
360
361 return ret;
362 }
363
364 /*
365 * find the victim alloc group, where #blkno fits.
366 */
ocfs2_find_victim_alloc_group(struct inode * inode,u64 vict_blkno,int type,int slot,int * vict_bit,struct buffer_head ** ret_bh)367 static int ocfs2_find_victim_alloc_group(struct inode *inode,
368 u64 vict_blkno,
369 int type, int slot,
370 int *vict_bit,
371 struct buffer_head **ret_bh)
372 {
373 int ret, i, len, bits_per_unit = 0;
374 u64 blkno;
375 char namebuf[40];
376
377 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
378 struct buffer_head *ac_bh = NULL, *gd_bh = NULL;
379 struct ocfs2_chain_list *cl;
380 struct ocfs2_chain_rec *rec;
381 struct ocfs2_dinode *ac_dinode;
382 struct ocfs2_group_desc *bg;
383
384 len = ocfs2_sprintf_system_inode_name(namebuf, sizeof(namebuf), type, slot);
385 ret = ocfs2_lookup_ino_from_name(osb->sys_root_inode, namebuf, len, &blkno);
386
387 if (ret) {
388 ret = -ENOENT;
389 goto out;
390 }
391
392 ret = ocfs2_read_blocks_sync(osb, blkno, 1, &ac_bh);
393 if (ret) {
394 mlog_errno(ret);
395 goto out;
396 }
397
398 ac_dinode = (struct ocfs2_dinode *)ac_bh->b_data;
399 cl = &(ac_dinode->id2.i_chain);
400 rec = &(cl->cl_recs[0]);
401
402 if (type == GLOBAL_BITMAP_SYSTEM_INODE)
403 bits_per_unit = osb->s_clustersize_bits -
404 inode->i_sb->s_blocksize_bits;
405 /*
406 * 'vict_blkno' was out of the valid range.
407 */
408 if ((vict_blkno < le64_to_cpu(rec->c_blkno)) ||
409 (vict_blkno >= ((u64)le32_to_cpu(ac_dinode->id1.bitmap1.i_total) <<
410 bits_per_unit))) {
411 ret = -EINVAL;
412 goto out;
413 }
414
415 for (i = 0; i < le16_to_cpu(cl->cl_next_free_rec); i++) {
416
417 rec = &(cl->cl_recs[i]);
418 if (!rec)
419 continue;
420
421 bg = NULL;
422
423 do {
424 if (!bg)
425 blkno = le64_to_cpu(rec->c_blkno);
426 else
427 blkno = le64_to_cpu(bg->bg_next_group);
428
429 if (gd_bh) {
430 brelse(gd_bh);
431 gd_bh = NULL;
432 }
433
434 ret = ocfs2_read_blocks_sync(osb, blkno, 1, &gd_bh);
435 if (ret) {
436 mlog_errno(ret);
437 goto out;
438 }
439
440 bg = (struct ocfs2_group_desc *)gd_bh->b_data;
441
442 if (vict_blkno < (le64_to_cpu(bg->bg_blkno) +
443 (le16_to_cpu(bg->bg_bits) << bits_per_unit))) {
444
445 *ret_bh = gd_bh;
446 *vict_bit = (vict_blkno - blkno) >>
447 bits_per_unit;
448 mlog(0, "find the victim group: #%llu, "
449 "total_bits: %u, vict_bit: %u\n",
450 blkno, le16_to_cpu(bg->bg_bits),
451 *vict_bit);
452 goto out;
453 }
454
455 } while (le64_to_cpu(bg->bg_next_group));
456 }
457
458 ret = -EINVAL;
459 out:
460 brelse(ac_bh);
461
462 /*
463 * caller has to release the gd_bh properly.
464 */
465 return ret;
466 }
467
468 /*
469 * XXX: helper to validate and adjust moving goal.
470 */
ocfs2_validate_and_adjust_move_goal(struct inode * inode,struct ocfs2_move_extents * range)471 static int ocfs2_validate_and_adjust_move_goal(struct inode *inode,
472 struct ocfs2_move_extents *range)
473 {
474 int ret, goal_bit = 0;
475
476 struct buffer_head *gd_bh = NULL;
477 struct ocfs2_group_desc *bg;
478 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
479 int c_to_b = 1 << (osb->s_clustersize_bits -
480 inode->i_sb->s_blocksize_bits);
481
482 /*
483 * make goal become cluster aligned.
484 */
485 range->me_goal = ocfs2_block_to_cluster_start(inode->i_sb,
486 range->me_goal);
487 /*
488 * validate goal sits within global_bitmap, and return the victim
489 * group desc
490 */
491 ret = ocfs2_find_victim_alloc_group(inode, range->me_goal,
492 GLOBAL_BITMAP_SYSTEM_INODE,
493 OCFS2_INVALID_SLOT,
494 &goal_bit, &gd_bh);
495 if (ret)
496 goto out;
497
498 bg = (struct ocfs2_group_desc *)gd_bh->b_data;
499
500 /*
501 * moving goal is not allowed to start with a group desc blok(#0 blk)
502 * let's compromise to the latter cluster.
503 */
504 if (range->me_goal == le64_to_cpu(bg->bg_blkno))
505 range->me_goal += c_to_b;
506
507 /*
508 * movement is not gonna cross two groups.
509 */
510 if ((le16_to_cpu(bg->bg_bits) - goal_bit) * osb->s_clustersize <
511 range->me_len) {
512 ret = -EINVAL;
513 goto out;
514 }
515 /*
516 * more exact validations/adjustments will be performed later during
517 * moving operation for each extent range.
518 */
519 mlog(0, "extents get ready to be moved to #%llu block\n",
520 range->me_goal);
521
522 out:
523 brelse(gd_bh);
524
525 return ret;
526 }
527
ocfs2_probe_alloc_group(struct inode * inode,struct buffer_head * bh,int * goal_bit,u32 move_len,u32 max_hop,u32 * phys_cpos)528 static void ocfs2_probe_alloc_group(struct inode *inode, struct buffer_head *bh,
529 int *goal_bit, u32 move_len, u32 max_hop,
530 u32 *phys_cpos)
531 {
532 int i, used, last_free_bits = 0, base_bit = *goal_bit;
533 struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data;
534 u32 base_cpos = ocfs2_blocks_to_clusters(inode->i_sb,
535 le64_to_cpu(gd->bg_blkno));
536
537 for (i = base_bit; i < le16_to_cpu(gd->bg_bits); i++) {
538
539 used = ocfs2_test_bit(i, (unsigned long *)gd->bg_bitmap);
540 if (used) {
541 /*
542 * we even tried searching the free chunk by jumping
543 * a 'max_hop' distance, but still failed.
544 */
545 if ((i - base_bit) > max_hop) {
546 *phys_cpos = 0;
547 break;
548 }
549
550 if (last_free_bits)
551 last_free_bits = 0;
552
553 continue;
554 } else
555 last_free_bits++;
556
557 if (last_free_bits == move_len) {
558 i -= move_len;
559 *goal_bit = i;
560 *phys_cpos = base_cpos + i;
561 break;
562 }
563 }
564
565 mlog(0, "found phys_cpos: %u to fit the wanted moving.\n", *phys_cpos);
566 }
567
ocfs2_move_extent(struct ocfs2_move_extents_context * context,u32 cpos,u32 phys_cpos,u32 * new_phys_cpos,u32 len,int ext_flags)568 static int ocfs2_move_extent(struct ocfs2_move_extents_context *context,
569 u32 cpos, u32 phys_cpos, u32 *new_phys_cpos,
570 u32 len, int ext_flags)
571 {
572 int ret, credits = 0, extra_blocks = 0, goal_bit = 0;
573 handle_t *handle;
574 struct inode *inode = context->inode;
575 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
576 struct inode *tl_inode = osb->osb_tl_inode;
577 struct inode *gb_inode = NULL;
578 struct buffer_head *gb_bh = NULL;
579 struct buffer_head *gd_bh = NULL;
580 struct ocfs2_group_desc *gd;
581 struct ocfs2_refcount_tree *ref_tree = NULL;
582 u32 move_max_hop = ocfs2_blocks_to_clusters(inode->i_sb,
583 context->range->me_threshold);
584 u64 phys_blkno, new_phys_blkno;
585
586 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
587
588 if ((ext_flags & OCFS2_EXT_REFCOUNTED) && len) {
589 BUG_ON(!ocfs2_is_refcount_inode(inode));
590 BUG_ON(!context->refcount_loc);
591
592 ret = ocfs2_lock_refcount_tree(osb, context->refcount_loc, 1,
593 &ref_tree, NULL);
594 if (ret) {
595 mlog_errno(ret);
596 return ret;
597 }
598
599 ret = ocfs2_prepare_refcount_change_for_del(inode,
600 context->refcount_loc,
601 phys_blkno,
602 len,
603 &credits,
604 &extra_blocks);
605 if (ret) {
606 mlog_errno(ret);
607 goto out;
608 }
609 }
610
611 ret = ocfs2_lock_meta_allocator_move_extents(inode, &context->et,
612 len, 1,
613 &context->meta_ac,
614 extra_blocks, &credits);
615 if (ret) {
616 mlog_errno(ret);
617 goto out;
618 }
619
620 /*
621 * need to count 2 extra credits for global_bitmap inode and
622 * group descriptor.
623 */
624 credits += OCFS2_INODE_UPDATE_CREDITS + 1;
625
626 inode_lock(tl_inode);
627
628 /*
629 * ocfs2_move_extent() didn't reserve any clusters in lock_allocators()
630 * logic, while we still need to lock the global_bitmap.
631 */
632 gb_inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE,
633 OCFS2_INVALID_SLOT);
634 if (!gb_inode) {
635 mlog(ML_ERROR, "unable to get global_bitmap inode\n");
636 ret = -EIO;
637 goto out_unlock_tl_inode;
638 }
639
640 inode_lock(gb_inode);
641
642 ret = ocfs2_inode_lock(gb_inode, &gb_bh, 1);
643 if (ret) {
644 mlog_errno(ret);
645 goto out_unlock_gb_inode;
646 }
647
648 handle = ocfs2_start_trans(osb, credits);
649 if (IS_ERR(handle)) {
650 ret = PTR_ERR(handle);
651 mlog_errno(ret);
652 goto out_unlock;
653 }
654
655 new_phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, *new_phys_cpos);
656 ret = ocfs2_find_victim_alloc_group(inode, new_phys_blkno,
657 GLOBAL_BITMAP_SYSTEM_INODE,
658 OCFS2_INVALID_SLOT,
659 &goal_bit, &gd_bh);
660 if (ret) {
661 mlog_errno(ret);
662 goto out_commit;
663 }
664
665 /*
666 * probe the victim cluster group to find a proper
667 * region to fit wanted movement, it even will perform
668 * a best-effort attempt by compromising to a threshold
669 * around the goal.
670 */
671 ocfs2_probe_alloc_group(inode, gd_bh, &goal_bit, len, move_max_hop,
672 new_phys_cpos);
673 if (!*new_phys_cpos) {
674 ret = -ENOSPC;
675 goto out_commit;
676 }
677
678 ret = __ocfs2_move_extent(handle, context, cpos, len, phys_cpos,
679 *new_phys_cpos, ext_flags);
680 if (ret) {
681 mlog_errno(ret);
682 goto out_commit;
683 }
684
685 gd = (struct ocfs2_group_desc *)gd_bh->b_data;
686 ret = ocfs2_alloc_dinode_update_counts(gb_inode, handle, gb_bh, len,
687 le16_to_cpu(gd->bg_chain));
688 if (ret) {
689 mlog_errno(ret);
690 goto out_commit;
691 }
692
693 ret = ocfs2_block_group_set_bits(handle, gb_inode, gd, gd_bh,
694 goal_bit, len, 0, 0);
695 if (ret) {
696 ocfs2_rollback_alloc_dinode_counts(gb_inode, gb_bh, len,
697 le16_to_cpu(gd->bg_chain));
698 mlog_errno(ret);
699 }
700
701 /*
702 * Here we should write the new page out first if we are
703 * in write-back mode.
704 */
705 ret = ocfs2_cow_sync_writeback(inode->i_sb, context->inode, cpos, len);
706 if (ret)
707 mlog_errno(ret);
708
709 out_commit:
710 ocfs2_commit_trans(osb, handle);
711 brelse(gd_bh);
712 out_unlock:
713 ocfs2_inode_unlock(gb_inode, 1);
714 out_unlock_gb_inode:
715 inode_unlock(gb_inode);
716 brelse(gb_bh);
717 iput(gb_inode);
718 out_unlock_tl_inode:
719 inode_unlock(tl_inode);
720
721 out:
722 if (context->meta_ac) {
723 ocfs2_free_alloc_context(context->meta_ac);
724 context->meta_ac = NULL;
725 }
726
727 if (ref_tree)
728 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
729
730 return ret;
731 }
732
733 /*
734 * Helper to calculate the defraging length in one run according to threshold.
735 */
ocfs2_calc_extent_defrag_len(u32 * alloc_size,u32 * len_defraged,u32 threshold,int * skip)736 static void ocfs2_calc_extent_defrag_len(u32 *alloc_size, u32 *len_defraged,
737 u32 threshold, int *skip)
738 {
739 if ((*alloc_size + *len_defraged) < threshold) {
740 /*
741 * proceed defragmentation until we meet the thresh
742 */
743 *len_defraged += *alloc_size;
744 } else if (*len_defraged == 0) {
745 /*
746 * XXX: skip a large extent.
747 */
748 *skip = 1;
749 } else {
750 /*
751 * split this extent to coalesce with former pieces as
752 * to reach the threshold.
753 *
754 * we're done here with one cycle of defragmentation
755 * in a size of 'thresh', resetting 'len_defraged'
756 * forces a new defragmentation.
757 */
758 *alloc_size = threshold - *len_defraged;
759 *len_defraged = 0;
760 }
761 }
762
__ocfs2_move_extents_range(struct buffer_head * di_bh,struct ocfs2_move_extents_context * context)763 static int __ocfs2_move_extents_range(struct buffer_head *di_bh,
764 struct ocfs2_move_extents_context *context)
765 {
766 int ret = 0, flags, do_defrag, skip = 0;
767 u32 cpos, phys_cpos, move_start, len_to_move, alloc_size;
768 u32 len_defraged = 0, defrag_thresh = 0, new_phys_cpos = 0;
769
770 struct inode *inode = context->inode;
771 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
772 struct ocfs2_move_extents *range = context->range;
773 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
774
775 if ((i_size_read(inode) == 0) || (range->me_len == 0))
776 return 0;
777
778 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
779 return 0;
780
781 context->refcount_loc = le64_to_cpu(di->i_refcount_loc);
782
783 ocfs2_init_dinode_extent_tree(&context->et, INODE_CACHE(inode), di_bh);
784 ocfs2_init_dealloc_ctxt(&context->dealloc);
785
786 /*
787 * TO-DO XXX:
788 *
789 * - xattr extents.
790 */
791
792 do_defrag = context->auto_defrag;
793
794 /*
795 * extents moving happens in unit of clusters, for the sake
796 * of simplicity, we may ignore two clusters where 'byte_start'
797 * and 'byte_start + len' were within.
798 */
799 move_start = ocfs2_clusters_for_bytes(osb->sb, range->me_start);
800 len_to_move = (range->me_start + range->me_len) >>
801 osb->s_clustersize_bits;
802 if (len_to_move >= move_start)
803 len_to_move -= move_start;
804 else
805 len_to_move = 0;
806
807 if (do_defrag) {
808 defrag_thresh = range->me_threshold >> osb->s_clustersize_bits;
809 if (defrag_thresh <= 1)
810 goto done;
811 } else
812 new_phys_cpos = ocfs2_blocks_to_clusters(inode->i_sb,
813 range->me_goal);
814
815 mlog(0, "Inode: %llu, start: %llu, len: %llu, cstart: %u, clen: %u, "
816 "thresh: %u\n",
817 (unsigned long long)OCFS2_I(inode)->ip_blkno,
818 (unsigned long long)range->me_start,
819 (unsigned long long)range->me_len,
820 move_start, len_to_move, defrag_thresh);
821
822 cpos = move_start;
823 while (len_to_move) {
824 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &alloc_size,
825 &flags);
826 if (ret) {
827 mlog_errno(ret);
828 goto out;
829 }
830
831 if (alloc_size > len_to_move)
832 alloc_size = len_to_move;
833
834 /*
835 * XXX: how to deal with a hole:
836 *
837 * - skip the hole of course
838 * - force a new defragmentation
839 */
840 if (!phys_cpos) {
841 if (do_defrag)
842 len_defraged = 0;
843
844 goto next;
845 }
846
847 if (do_defrag) {
848 ocfs2_calc_extent_defrag_len(&alloc_size, &len_defraged,
849 defrag_thresh, &skip);
850 /*
851 * skip large extents
852 */
853 if (skip) {
854 skip = 0;
855 goto next;
856 }
857
858 mlog(0, "#Defrag: cpos: %u, phys_cpos: %u, "
859 "alloc_size: %u, len_defraged: %u\n",
860 cpos, phys_cpos, alloc_size, len_defraged);
861
862 ret = ocfs2_defrag_extent(context, cpos, phys_cpos,
863 &alloc_size, flags);
864 } else {
865 ret = ocfs2_move_extent(context, cpos, phys_cpos,
866 &new_phys_cpos, alloc_size,
867 flags);
868
869 new_phys_cpos += alloc_size;
870 }
871
872 if (ret < 0) {
873 mlog_errno(ret);
874 goto out;
875 }
876 /*
877 * Invalidate extent cache after moving/defragging to prevent
878 * stale cached data with outdated extent flags.
879 */
880 ocfs2_extent_map_trunc(inode, cpos);
881
882 context->clusters_moved += alloc_size;
883 next:
884 cpos += alloc_size;
885 len_to_move -= alloc_size;
886 }
887
888 done:
889 range->me_flags |= OCFS2_MOVE_EXT_FL_COMPLETE;
890
891 out:
892 range->me_moved_len = ocfs2_clusters_to_bytes(osb->sb,
893 context->clusters_moved);
894 range->me_new_offset = ocfs2_clusters_to_bytes(osb->sb,
895 context->new_phys_cpos);
896
897 ocfs2_schedule_truncate_log_flush(osb, 1);
898 ocfs2_run_deallocs(osb, &context->dealloc);
899
900 return ret;
901 }
902
ocfs2_move_extents(struct ocfs2_move_extents_context * context)903 static int ocfs2_move_extents(struct ocfs2_move_extents_context *context)
904 {
905 int status;
906 handle_t *handle;
907 struct inode *inode = context->inode;
908 struct ocfs2_dinode *di;
909 struct buffer_head *di_bh = NULL;
910 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
911
912 if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
913 return -EROFS;
914
915 inode_lock(inode);
916
917 /*
918 * This prevents concurrent writes from other nodes
919 */
920 status = ocfs2_rw_lock(inode, 1);
921 if (status) {
922 mlog_errno(status);
923 goto out;
924 }
925
926 status = ocfs2_inode_lock(inode, &di_bh, 1);
927 if (status) {
928 mlog_errno(status);
929 goto out_rw_unlock;
930 }
931
932 /*
933 * remember ip_xattr_sem also needs to be held if necessary
934 */
935 down_write(&OCFS2_I(inode)->ip_alloc_sem);
936
937 status = __ocfs2_move_extents_range(di_bh, context);
938
939 up_write(&OCFS2_I(inode)->ip_alloc_sem);
940 if (status) {
941 mlog_errno(status);
942 goto out_inode_unlock;
943 }
944
945 /*
946 * We update ctime for these changes
947 */
948 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
949 if (IS_ERR(handle)) {
950 status = PTR_ERR(handle);
951 mlog_errno(status);
952 goto out_inode_unlock;
953 }
954
955 status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
956 OCFS2_JOURNAL_ACCESS_WRITE);
957 if (status) {
958 mlog_errno(status);
959 goto out_commit;
960 }
961
962 di = (struct ocfs2_dinode *)di_bh->b_data;
963 inode_set_ctime_current(inode);
964 di->i_ctime = cpu_to_le64(inode_get_ctime_sec(inode));
965 di->i_ctime_nsec = cpu_to_le32(inode_get_ctime_nsec(inode));
966 ocfs2_update_inode_fsync_trans(handle, inode, 0);
967
968 ocfs2_journal_dirty(handle, di_bh);
969
970 out_commit:
971 ocfs2_commit_trans(osb, handle);
972
973 out_inode_unlock:
974 brelse(di_bh);
975 ocfs2_inode_unlock(inode, 1);
976 out_rw_unlock:
977 ocfs2_rw_unlock(inode, 1);
978 out:
979 inode_unlock(inode);
980
981 return status;
982 }
983
ocfs2_ioctl_move_extents(struct file * filp,void __user * argp)984 int ocfs2_ioctl_move_extents(struct file *filp, void __user *argp)
985 {
986 int status;
987
988 struct inode *inode = file_inode(filp);
989 struct ocfs2_move_extents range;
990 struct ocfs2_move_extents_context *context;
991
992 if (!argp)
993 return -EINVAL;
994
995 status = mnt_want_write_file(filp);
996 if (status)
997 return status;
998
999 if ((!S_ISREG(inode->i_mode)) || !(filp->f_mode & FMODE_WRITE)) {
1000 status = -EPERM;
1001 goto out_drop;
1002 }
1003
1004 if (inode->i_flags & (S_IMMUTABLE|S_APPEND)) {
1005 status = -EPERM;
1006 goto out_drop;
1007 }
1008
1009 context = kzalloc(sizeof(struct ocfs2_move_extents_context), GFP_NOFS);
1010 if (!context) {
1011 status = -ENOMEM;
1012 mlog_errno(status);
1013 goto out_drop;
1014 }
1015
1016 context->inode = inode;
1017 context->file = filp;
1018
1019 if (copy_from_user(&range, argp, sizeof(range))) {
1020 status = -EFAULT;
1021 goto out_free;
1022 }
1023
1024 if (range.me_start > i_size_read(inode)) {
1025 status = -EINVAL;
1026 goto out_free;
1027 }
1028
1029 if (range.me_start + range.me_len > i_size_read(inode))
1030 range.me_len = i_size_read(inode) - range.me_start;
1031
1032 context->range = ⦥
1033
1034 /*
1035 * ok, the default threshold for the defragmentation
1036 * is 1M, since our maximum clustersize was 1M also.
1037 * any thought?
1038 */
1039 if (!range.me_threshold)
1040 range.me_threshold = 1024 * 1024;
1041
1042 if (range.me_threshold > i_size_read(inode))
1043 range.me_threshold = i_size_read(inode);
1044
1045 if (range.me_flags & ~(OCFS2_MOVE_EXT_FL_AUTO_DEFRAG |
1046 OCFS2_MOVE_EXT_FL_PART_DEFRAG)) {
1047 status = -EINVAL;
1048 goto out_free;
1049 }
1050
1051 if (range.me_flags & OCFS2_MOVE_EXT_FL_AUTO_DEFRAG) {
1052 context->auto_defrag = 1;
1053
1054 if (range.me_flags & OCFS2_MOVE_EXT_FL_PART_DEFRAG)
1055 context->partial = 1;
1056 } else {
1057 /*
1058 * first best-effort attempt to validate and adjust the goal
1059 * (physical address in block), while it can't guarantee later
1060 * operation can succeed all the time since global_bitmap may
1061 * change a bit over time.
1062 */
1063
1064 status = ocfs2_validate_and_adjust_move_goal(inode, &range);
1065 if (status)
1066 goto out_copy;
1067 }
1068
1069 status = ocfs2_move_extents(context);
1070 if (status)
1071 mlog_errno(status);
1072 out_copy:
1073 /*
1074 * movement/defragmentation may end up being partially completed,
1075 * that's the reason why we need to return userspace the finished
1076 * length and new_offset even if failure happens somewhere.
1077 */
1078 if (copy_to_user(argp, &range, sizeof(range)))
1079 status = -EFAULT;
1080
1081 out_free:
1082 kfree(context);
1083 out_drop:
1084 mnt_drop_write_file(filp);
1085
1086 return status;
1087 }
1088