Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / fs / ocfs2 / move_extents.c
blob7eb3b0a6347ef74990589ac47f5b4823441c8135
1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
4 * move_extents.c
6 * Copyright (C) 2011 Oracle. All rights reserved.
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public
10 * License version 2 as published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
17 #include <linux/fs.h>
18 #include <linux/types.h>
19 #include <linux/mount.h>
20 #include <linux/swap.h>
22 #include <cluster/masklog.h>
24 #include "ocfs2.h"
25 #include "ocfs2_ioctl.h"
27 #include "alloc.h"
28 #include "aops.h"
29 #include "dlmglue.h"
30 #include "extent_map.h"
31 #include "inode.h"
32 #include "journal.h"
33 #include "suballoc.h"
34 #include "uptodate.h"
35 #include "super.h"
36 #include "dir.h"
37 #include "buffer_head_io.h"
38 #include "sysfile.h"
39 #include "refcounttree.h"
40 #include "move_extents.h"
42 struct ocfs2_move_extents_context {
43 struct inode *inode;
44 struct file *file;
45 int auto_defrag;
46 int partial;
47 int credits;
48 u32 new_phys_cpos;
49 u32 clusters_moved;
50 u64 refcount_loc;
51 struct ocfs2_move_extents *range;
52 struct ocfs2_extent_tree et;
53 struct ocfs2_alloc_context *meta_ac;
54 struct ocfs2_alloc_context *data_ac;
55 struct ocfs2_cached_dealloc_ctxt dealloc;
58 static int __ocfs2_move_extent(handle_t *handle,
59 struct ocfs2_move_extents_context *context,
60 u32 cpos, u32 len, u32 p_cpos, u32 new_p_cpos,
61 int ext_flags)
63 int ret = 0, index;
64 struct inode *inode = context->inode;
65 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
66 struct ocfs2_extent_rec *rec, replace_rec;
67 struct ocfs2_path *path = NULL;
68 struct ocfs2_extent_list *el;
69 u64 ino = ocfs2_metadata_cache_owner(context->et.et_ci);
70 u64 old_blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cpos);
72 ret = ocfs2_duplicate_clusters_by_page(handle, inode, cpos,
73 p_cpos, new_p_cpos, len);
74 if (ret) {
75 mlog_errno(ret);
76 goto out;
79 memset(&replace_rec, 0, sizeof(replace_rec));
80 replace_rec.e_cpos = cpu_to_le32(cpos);
81 replace_rec.e_leaf_clusters = cpu_to_le16(len);
82 replace_rec.e_blkno = cpu_to_le64(ocfs2_clusters_to_blocks(inode->i_sb,
83 new_p_cpos));
85 path = ocfs2_new_path_from_et(&context->et);
86 if (!path) {
87 ret = -ENOMEM;
88 mlog_errno(ret);
89 goto out;
92 ret = ocfs2_find_path(INODE_CACHE(inode), path, cpos);
93 if (ret) {
94 mlog_errno(ret);
95 goto out;
98 el = path_leaf_el(path);
100 index = ocfs2_search_extent_list(el, cpos);
101 if (index == -1) {
102 ret = ocfs2_error(inode->i_sb,
103 "Inode %llu has an extent at cpos %u which can no longer be found\n",
104 (unsigned long long)ino, cpos);
105 goto out;
108 rec = &el->l_recs[index];
110 BUG_ON(ext_flags != rec->e_flags);
112 * after moving/defraging to new location, the extent is not going
113 * to be refcounted anymore.
115 replace_rec.e_flags = ext_flags & ~OCFS2_EXT_REFCOUNTED;
117 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode),
118 context->et.et_root_bh,
119 OCFS2_JOURNAL_ACCESS_WRITE);
120 if (ret) {
121 mlog_errno(ret);
122 goto out;
125 ret = ocfs2_split_extent(handle, &context->et, path, index,
126 &replace_rec, context->meta_ac,
127 &context->dealloc);
128 if (ret) {
129 mlog_errno(ret);
130 goto out;
133 ocfs2_journal_dirty(handle, context->et.et_root_bh);
135 context->new_phys_cpos = new_p_cpos;
138 * need I to append truncate log for old clusters?
140 if (old_blkno) {
141 if (ext_flags & OCFS2_EXT_REFCOUNTED)
142 ret = ocfs2_decrease_refcount(inode, handle,
143 ocfs2_blocks_to_clusters(osb->sb,
144 old_blkno),
145 len, context->meta_ac,
146 &context->dealloc, 1);
147 else
148 ret = ocfs2_truncate_log_append(osb, handle,
149 old_blkno, len);
152 ocfs2_update_inode_fsync_trans(handle, inode, 0);
153 out:
154 ocfs2_free_path(path);
155 return ret;
159 * lock allocators, and reserving appropriate number of bits for
160 * meta blocks and data clusters.
162 * in some cases, we don't need to reserve clusters, just let data_ac
163 * be NULL.
165 static int ocfs2_lock_allocators_move_extents(struct inode *inode,
166 struct ocfs2_extent_tree *et,
167 u32 clusters_to_move,
168 u32 extents_to_split,
169 struct ocfs2_alloc_context **meta_ac,
170 struct ocfs2_alloc_context **data_ac,
171 int extra_blocks,
172 int *credits)
174 int ret, num_free_extents;
175 unsigned int max_recs_needed = 2 * extents_to_split + clusters_to_move;
176 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
178 num_free_extents = ocfs2_num_free_extents(et);
179 if (num_free_extents < 0) {
180 ret = num_free_extents;
181 mlog_errno(ret);
182 goto out;
185 if (!num_free_extents ||
186 (ocfs2_sparse_alloc(osb) && num_free_extents < max_recs_needed))
187 extra_blocks += ocfs2_extend_meta_needed(et->et_root_el);
189 ret = ocfs2_reserve_new_metadata_blocks(osb, extra_blocks, meta_ac);
190 if (ret) {
191 mlog_errno(ret);
192 goto out;
195 if (data_ac) {
196 ret = ocfs2_reserve_clusters(osb, clusters_to_move, data_ac);
197 if (ret) {
198 mlog_errno(ret);
199 goto out;
203 *credits += ocfs2_calc_extend_credits(osb->sb, et->et_root_el);
205 mlog(0, "reserve metadata_blocks: %d, data_clusters: %u, credits: %d\n",
206 extra_blocks, clusters_to_move, *credits);
207 out:
208 if (ret) {
209 if (*meta_ac) {
210 ocfs2_free_alloc_context(*meta_ac);
211 *meta_ac = NULL;
215 return ret;
219 * Using one journal handle to guarantee the data consistency in case
220 * crash happens anywhere.
222 * XXX: defrag can end up with finishing partial extent as requested,
223 * due to not enough contiguous clusters can be found in allocator.
225 static int ocfs2_defrag_extent(struct ocfs2_move_extents_context *context,
226 u32 cpos, u32 phys_cpos, u32 *len, int ext_flags)
228 int ret, credits = 0, extra_blocks = 0, partial = context->partial;
229 handle_t *handle;
230 struct inode *inode = context->inode;
231 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
232 struct inode *tl_inode = osb->osb_tl_inode;
233 struct ocfs2_refcount_tree *ref_tree = NULL;
234 u32 new_phys_cpos, new_len;
235 u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
237 if ((ext_flags & OCFS2_EXT_REFCOUNTED) && *len) {
238 BUG_ON(!ocfs2_is_refcount_inode(inode));
239 BUG_ON(!context->refcount_loc);
241 ret = ocfs2_lock_refcount_tree(osb, context->refcount_loc, 1,
242 &ref_tree, NULL);
243 if (ret) {
244 mlog_errno(ret);
245 return ret;
248 ret = ocfs2_prepare_refcount_change_for_del(inode,
249 context->refcount_loc,
250 phys_blkno,
251 *len,
252 &credits,
253 &extra_blocks);
254 if (ret) {
255 mlog_errno(ret);
256 goto out;
260 ret = ocfs2_lock_allocators_move_extents(inode, &context->et, *len, 1,
261 &context->meta_ac,
262 &context->data_ac,
263 extra_blocks, &credits);
264 if (ret) {
265 mlog_errno(ret);
266 goto out;
270 * should be using allocation reservation strategy there?
272 * if (context->data_ac)
273 * context->data_ac->ac_resv = &OCFS2_I(inode)->ip_la_data_resv;
276 inode_lock(tl_inode);
278 if (ocfs2_truncate_log_needs_flush(osb)) {
279 ret = __ocfs2_flush_truncate_log(osb);
280 if (ret < 0) {
281 mlog_errno(ret);
282 goto out_unlock_mutex;
286 handle = ocfs2_start_trans(osb, credits);
287 if (IS_ERR(handle)) {
288 ret = PTR_ERR(handle);
289 mlog_errno(ret);
290 goto out_unlock_mutex;
293 ret = __ocfs2_claim_clusters(handle, context->data_ac, 1, *len,
294 &new_phys_cpos, &new_len);
295 if (ret) {
296 mlog_errno(ret);
297 goto out_commit;
301 * allowing partial extent moving is kind of 'pros and cons', it makes
302 * whole defragmentation less likely to fail, on the contrary, the bad
303 * thing is it may make the fs even more fragmented after moving, let
304 * userspace make a good decision here.
306 if (new_len != *len) {
307 mlog(0, "len_claimed: %u, len: %u\n", new_len, *len);
308 if (!partial) {
309 context->range->me_flags &= ~OCFS2_MOVE_EXT_FL_COMPLETE;
310 ret = -ENOSPC;
311 goto out_commit;
315 mlog(0, "cpos: %u, phys_cpos: %u, new_phys_cpos: %u\n", cpos,
316 phys_cpos, new_phys_cpos);
318 ret = __ocfs2_move_extent(handle, context, cpos, new_len, phys_cpos,
319 new_phys_cpos, ext_flags);
320 if (ret)
321 mlog_errno(ret);
323 if (partial && (new_len != *len))
324 *len = new_len;
327 * Here we should write the new page out first if we are
328 * in write-back mode.
330 ret = ocfs2_cow_sync_writeback(inode->i_sb, context->inode, cpos, *len);
331 if (ret)
332 mlog_errno(ret);
334 out_commit:
335 ocfs2_commit_trans(osb, handle);
337 out_unlock_mutex:
338 inode_unlock(tl_inode);
340 if (context->data_ac) {
341 ocfs2_free_alloc_context(context->data_ac);
342 context->data_ac = NULL;
345 if (context->meta_ac) {
346 ocfs2_free_alloc_context(context->meta_ac);
347 context->meta_ac = NULL;
350 out:
351 if (ref_tree)
352 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
354 return ret;
358 * find the victim alloc group, where #blkno fits.
360 static int ocfs2_find_victim_alloc_group(struct inode *inode,
361 u64 vict_blkno,
362 int type, int slot,
363 int *vict_bit,
364 struct buffer_head **ret_bh)
366 int ret, i, bits_per_unit = 0;
367 u64 blkno;
368 char namebuf[40];
370 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
371 struct buffer_head *ac_bh = NULL, *gd_bh = NULL;
372 struct ocfs2_chain_list *cl;
373 struct ocfs2_chain_rec *rec;
374 struct ocfs2_dinode *ac_dinode;
375 struct ocfs2_group_desc *bg;
377 ocfs2_sprintf_system_inode_name(namebuf, sizeof(namebuf), type, slot);
378 ret = ocfs2_lookup_ino_from_name(osb->sys_root_inode, namebuf,
379 strlen(namebuf), &blkno);
380 if (ret) {
381 ret = -ENOENT;
382 goto out;
385 ret = ocfs2_read_blocks_sync(osb, blkno, 1, &ac_bh);
386 if (ret) {
387 mlog_errno(ret);
388 goto out;
391 ac_dinode = (struct ocfs2_dinode *)ac_bh->b_data;
392 cl = &(ac_dinode->id2.i_chain);
393 rec = &(cl->cl_recs[0]);
395 if (type == GLOBAL_BITMAP_SYSTEM_INODE)
396 bits_per_unit = osb->s_clustersize_bits -
397 inode->i_sb->s_blocksize_bits;
399 * 'vict_blkno' was out of the valid range.
401 if ((vict_blkno < le64_to_cpu(rec->c_blkno)) ||
402 (vict_blkno >= ((u64)le32_to_cpu(ac_dinode->id1.bitmap1.i_total) <<
403 bits_per_unit))) {
404 ret = -EINVAL;
405 goto out;
408 for (i = 0; i < le16_to_cpu(cl->cl_next_free_rec); i++) {
410 rec = &(cl->cl_recs[i]);
411 if (!rec)
412 continue;
414 bg = NULL;
416 do {
417 if (!bg)
418 blkno = le64_to_cpu(rec->c_blkno);
419 else
420 blkno = le64_to_cpu(bg->bg_next_group);
422 if (gd_bh) {
423 brelse(gd_bh);
424 gd_bh = NULL;
427 ret = ocfs2_read_blocks_sync(osb, blkno, 1, &gd_bh);
428 if (ret) {
429 mlog_errno(ret);
430 goto out;
433 bg = (struct ocfs2_group_desc *)gd_bh->b_data;
435 if (vict_blkno < (le64_to_cpu(bg->bg_blkno) +
436 le16_to_cpu(bg->bg_bits))) {
438 *ret_bh = gd_bh;
439 *vict_bit = (vict_blkno - blkno) >>
440 bits_per_unit;
441 mlog(0, "find the victim group: #%llu, "
442 "total_bits: %u, vict_bit: %u\n",
443 blkno, le16_to_cpu(bg->bg_bits),
444 *vict_bit);
445 goto out;
448 } while (le64_to_cpu(bg->bg_next_group));
451 ret = -EINVAL;
452 out:
453 brelse(ac_bh);
456 * caller has to release the gd_bh properly.
458 return ret;
462 * XXX: helper to validate and adjust moving goal.
464 static int ocfs2_validate_and_adjust_move_goal(struct inode *inode,
465 struct ocfs2_move_extents *range)
467 int ret, goal_bit = 0;
469 struct buffer_head *gd_bh = NULL;
470 struct ocfs2_group_desc *bg;
471 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
472 int c_to_b = 1 << (osb->s_clustersize_bits -
473 inode->i_sb->s_blocksize_bits);
476 * make goal become cluster aligned.
478 range->me_goal = ocfs2_block_to_cluster_start(inode->i_sb,
479 range->me_goal);
481 * validate goal sits within global_bitmap, and return the victim
482 * group desc
484 ret = ocfs2_find_victim_alloc_group(inode, range->me_goal,
485 GLOBAL_BITMAP_SYSTEM_INODE,
486 OCFS2_INVALID_SLOT,
487 &goal_bit, &gd_bh);
488 if (ret)
489 goto out;
491 bg = (struct ocfs2_group_desc *)gd_bh->b_data;
494 * moving goal is not allowd to start with a group desc blok(#0 blk)
495 * let's compromise to the latter cluster.
497 if (range->me_goal == le64_to_cpu(bg->bg_blkno))
498 range->me_goal += c_to_b;
501 * movement is not gonna cross two groups.
503 if ((le16_to_cpu(bg->bg_bits) - goal_bit) * osb->s_clustersize <
504 range->me_len) {
505 ret = -EINVAL;
506 goto out;
509 * more exact validations/adjustments will be performed later during
510 * moving operation for each extent range.
512 mlog(0, "extents get ready to be moved to #%llu block\n",
513 range->me_goal);
515 out:
516 brelse(gd_bh);
518 return ret;
521 static void ocfs2_probe_alloc_group(struct inode *inode, struct buffer_head *bh,
522 int *goal_bit, u32 move_len, u32 max_hop,
523 u32 *phys_cpos)
525 int i, used, last_free_bits = 0, base_bit = *goal_bit;
526 struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data;
527 u32 base_cpos = ocfs2_blocks_to_clusters(inode->i_sb,
528 le64_to_cpu(gd->bg_blkno));
530 for (i = base_bit; i < le16_to_cpu(gd->bg_bits); i++) {
532 used = ocfs2_test_bit(i, (unsigned long *)gd->bg_bitmap);
533 if (used) {
535 * we even tried searching the free chunk by jumping
536 * a 'max_hop' distance, but still failed.
538 if ((i - base_bit) > max_hop) {
539 *phys_cpos = 0;
540 break;
543 if (last_free_bits)
544 last_free_bits = 0;
546 continue;
547 } else
548 last_free_bits++;
550 if (last_free_bits == move_len) {
551 *goal_bit = i;
552 *phys_cpos = base_cpos + i;
553 break;
557 mlog(0, "found phys_cpos: %u to fit the wanted moving.\n", *phys_cpos);
560 static int ocfs2_move_extent(struct ocfs2_move_extents_context *context,
561 u32 cpos, u32 phys_cpos, u32 *new_phys_cpos,
562 u32 len, int ext_flags)
564 int ret, credits = 0, extra_blocks = 0, goal_bit = 0;
565 handle_t *handle;
566 struct inode *inode = context->inode;
567 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
568 struct inode *tl_inode = osb->osb_tl_inode;
569 struct inode *gb_inode = NULL;
570 struct buffer_head *gb_bh = NULL;
571 struct buffer_head *gd_bh = NULL;
572 struct ocfs2_group_desc *gd;
573 struct ocfs2_refcount_tree *ref_tree = NULL;
574 u32 move_max_hop = ocfs2_blocks_to_clusters(inode->i_sb,
575 context->range->me_threshold);
576 u64 phys_blkno, new_phys_blkno;
578 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
580 if ((ext_flags & OCFS2_EXT_REFCOUNTED) && len) {
581 BUG_ON(!ocfs2_is_refcount_inode(inode));
582 BUG_ON(!context->refcount_loc);
584 ret = ocfs2_lock_refcount_tree(osb, context->refcount_loc, 1,
585 &ref_tree, NULL);
586 if (ret) {
587 mlog_errno(ret);
588 return ret;
591 ret = ocfs2_prepare_refcount_change_for_del(inode,
592 context->refcount_loc,
593 phys_blkno,
594 len,
595 &credits,
596 &extra_blocks);
597 if (ret) {
598 mlog_errno(ret);
599 goto out;
603 ret = ocfs2_lock_allocators_move_extents(inode, &context->et, len, 1,
604 &context->meta_ac,
605 NULL, extra_blocks, &credits);
606 if (ret) {
607 mlog_errno(ret);
608 goto out;
612 * need to count 2 extra credits for global_bitmap inode and
613 * group descriptor.
615 credits += OCFS2_INODE_UPDATE_CREDITS + 1;
618 * ocfs2_move_extent() didn't reserve any clusters in lock_allocators()
619 * logic, while we still need to lock the global_bitmap.
621 gb_inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE,
622 OCFS2_INVALID_SLOT);
623 if (!gb_inode) {
624 mlog(ML_ERROR, "unable to get global_bitmap inode\n");
625 ret = -EIO;
626 goto out;
629 inode_lock(gb_inode);
631 ret = ocfs2_inode_lock(gb_inode, &gb_bh, 1);
632 if (ret) {
633 mlog_errno(ret);
634 goto out_unlock_gb_mutex;
637 inode_lock(tl_inode);
639 handle = ocfs2_start_trans(osb, credits);
640 if (IS_ERR(handle)) {
641 ret = PTR_ERR(handle);
642 mlog_errno(ret);
643 goto out_unlock_tl_inode;
646 new_phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, *new_phys_cpos);
647 ret = ocfs2_find_victim_alloc_group(inode, new_phys_blkno,
648 GLOBAL_BITMAP_SYSTEM_INODE,
649 OCFS2_INVALID_SLOT,
650 &goal_bit, &gd_bh);
651 if (ret) {
652 mlog_errno(ret);
653 goto out_commit;
657 * probe the victim cluster group to find a proper
658 * region to fit wanted movement, it even will perfrom
659 * a best-effort attempt by compromising to a threshold
660 * around the goal.
662 ocfs2_probe_alloc_group(inode, gd_bh, &goal_bit, len, move_max_hop,
663 new_phys_cpos);
664 if (!*new_phys_cpos) {
665 ret = -ENOSPC;
666 goto out_commit;
669 ret = __ocfs2_move_extent(handle, context, cpos, len, phys_cpos,
670 *new_phys_cpos, ext_flags);
671 if (ret) {
672 mlog_errno(ret);
673 goto out_commit;
676 gd = (struct ocfs2_group_desc *)gd_bh->b_data;
677 ret = ocfs2_alloc_dinode_update_counts(gb_inode, handle, gb_bh, len,
678 le16_to_cpu(gd->bg_chain));
679 if (ret) {
680 mlog_errno(ret);
681 goto out_commit;
684 ret = ocfs2_block_group_set_bits(handle, gb_inode, gd, gd_bh,
685 goal_bit, len);
686 if (ret) {
687 ocfs2_rollback_alloc_dinode_counts(gb_inode, gb_bh, len,
688 le16_to_cpu(gd->bg_chain));
689 mlog_errno(ret);
693 * Here we should write the new page out first if we are
694 * in write-back mode.
696 ret = ocfs2_cow_sync_writeback(inode->i_sb, context->inode, cpos, len);
697 if (ret)
698 mlog_errno(ret);
700 out_commit:
701 ocfs2_commit_trans(osb, handle);
702 brelse(gd_bh);
704 out_unlock_tl_inode:
705 inode_unlock(tl_inode);
707 ocfs2_inode_unlock(gb_inode, 1);
708 out_unlock_gb_mutex:
709 inode_unlock(gb_inode);
710 brelse(gb_bh);
711 iput(gb_inode);
713 out:
714 if (context->meta_ac) {
715 ocfs2_free_alloc_context(context->meta_ac);
716 context->meta_ac = NULL;
719 if (ref_tree)
720 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
722 return ret;
726 * Helper to calculate the defraging length in one run according to threshold.
728 static void ocfs2_calc_extent_defrag_len(u32 *alloc_size, u32 *len_defraged,
729 u32 threshold, int *skip)
731 if ((*alloc_size + *len_defraged) < threshold) {
733 * proceed defragmentation until we meet the thresh
735 *len_defraged += *alloc_size;
736 } else if (*len_defraged == 0) {
738 * XXX: skip a large extent.
740 *skip = 1;
741 } else {
743 * split this extent to coalesce with former pieces as
744 * to reach the threshold.
746 * we're done here with one cycle of defragmentation
747 * in a size of 'thresh', resetting 'len_defraged'
748 * forces a new defragmentation.
750 *alloc_size = threshold - *len_defraged;
751 *len_defraged = 0;
755 static int __ocfs2_move_extents_range(struct buffer_head *di_bh,
756 struct ocfs2_move_extents_context *context)
758 int ret = 0, flags, do_defrag, skip = 0;
759 u32 cpos, phys_cpos, move_start, len_to_move, alloc_size;
760 u32 len_defraged = 0, defrag_thresh = 0, new_phys_cpos = 0;
762 struct inode *inode = context->inode;
763 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
764 struct ocfs2_move_extents *range = context->range;
765 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
767 if ((i_size_read(inode) == 0) || (range->me_len == 0))
768 return 0;
770 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
771 return 0;
773 context->refcount_loc = le64_to_cpu(di->i_refcount_loc);
775 ocfs2_init_dinode_extent_tree(&context->et, INODE_CACHE(inode), di_bh);
776 ocfs2_init_dealloc_ctxt(&context->dealloc);
779 * TO-DO XXX:
781 * - xattr extents.
784 do_defrag = context->auto_defrag;
787 * extents moving happens in unit of clusters, for the sake
788 * of simplicity, we may ignore two clusters where 'byte_start'
789 * and 'byte_start + len' were within.
791 move_start = ocfs2_clusters_for_bytes(osb->sb, range->me_start);
792 len_to_move = (range->me_start + range->me_len) >>
793 osb->s_clustersize_bits;
794 if (len_to_move >= move_start)
795 len_to_move -= move_start;
796 else
797 len_to_move = 0;
799 if (do_defrag) {
800 defrag_thresh = range->me_threshold >> osb->s_clustersize_bits;
801 if (defrag_thresh <= 1)
802 goto done;
803 } else
804 new_phys_cpos = ocfs2_blocks_to_clusters(inode->i_sb,
805 range->me_goal);
807 mlog(0, "Inode: %llu, start: %llu, len: %llu, cstart: %u, clen: %u, "
808 "thresh: %u\n",
809 (unsigned long long)OCFS2_I(inode)->ip_blkno,
810 (unsigned long long)range->me_start,
811 (unsigned long long)range->me_len,
812 move_start, len_to_move, defrag_thresh);
814 cpos = move_start;
815 while (len_to_move) {
816 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &alloc_size,
817 &flags);
818 if (ret) {
819 mlog_errno(ret);
820 goto out;
823 if (alloc_size > len_to_move)
824 alloc_size = len_to_move;
827 * XXX: how to deal with a hole:
829 * - skip the hole of course
830 * - force a new defragmentation
832 if (!phys_cpos) {
833 if (do_defrag)
834 len_defraged = 0;
836 goto next;
839 if (do_defrag) {
840 ocfs2_calc_extent_defrag_len(&alloc_size, &len_defraged,
841 defrag_thresh, &skip);
843 * skip large extents
845 if (skip) {
846 skip = 0;
847 goto next;
850 mlog(0, "#Defrag: cpos: %u, phys_cpos: %u, "
851 "alloc_size: %u, len_defraged: %u\n",
852 cpos, phys_cpos, alloc_size, len_defraged);
854 ret = ocfs2_defrag_extent(context, cpos, phys_cpos,
855 &alloc_size, flags);
856 } else {
857 ret = ocfs2_move_extent(context, cpos, phys_cpos,
858 &new_phys_cpos, alloc_size,
859 flags);
861 new_phys_cpos += alloc_size;
864 if (ret < 0) {
865 mlog_errno(ret);
866 goto out;
869 context->clusters_moved += alloc_size;
870 next:
871 cpos += alloc_size;
872 len_to_move -= alloc_size;
875 done:
876 range->me_flags |= OCFS2_MOVE_EXT_FL_COMPLETE;
878 out:
879 range->me_moved_len = ocfs2_clusters_to_bytes(osb->sb,
880 context->clusters_moved);
881 range->me_new_offset = ocfs2_clusters_to_bytes(osb->sb,
882 context->new_phys_cpos);
884 ocfs2_schedule_truncate_log_flush(osb, 1);
885 ocfs2_run_deallocs(osb, &context->dealloc);
887 return ret;
890 static int ocfs2_move_extents(struct ocfs2_move_extents_context *context)
892 int status;
893 handle_t *handle;
894 struct inode *inode = context->inode;
895 struct ocfs2_dinode *di;
896 struct buffer_head *di_bh = NULL;
897 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
899 if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
900 return -EROFS;
902 inode_lock(inode);
905 * This prevents concurrent writes from other nodes
907 status = ocfs2_rw_lock(inode, 1);
908 if (status) {
909 mlog_errno(status);
910 goto out;
913 status = ocfs2_inode_lock(inode, &di_bh, 1);
914 if (status) {
915 mlog_errno(status);
916 goto out_rw_unlock;
920 * rememer ip_xattr_sem also needs to be held if necessary
922 down_write(&OCFS2_I(inode)->ip_alloc_sem);
924 status = __ocfs2_move_extents_range(di_bh, context);
926 up_write(&OCFS2_I(inode)->ip_alloc_sem);
927 if (status) {
928 mlog_errno(status);
929 goto out_inode_unlock;
933 * We update ctime for these changes
935 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
936 if (IS_ERR(handle)) {
937 status = PTR_ERR(handle);
938 mlog_errno(status);
939 goto out_inode_unlock;
942 status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
943 OCFS2_JOURNAL_ACCESS_WRITE);
944 if (status) {
945 mlog_errno(status);
946 goto out_commit;
949 di = (struct ocfs2_dinode *)di_bh->b_data;
950 inode->i_ctime = current_time(inode);
951 di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
952 di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
953 ocfs2_update_inode_fsync_trans(handle, inode, 0);
955 ocfs2_journal_dirty(handle, di_bh);
957 out_commit:
958 ocfs2_commit_trans(osb, handle);
960 out_inode_unlock:
961 brelse(di_bh);
962 ocfs2_inode_unlock(inode, 1);
963 out_rw_unlock:
964 ocfs2_rw_unlock(inode, 1);
965 out:
966 inode_unlock(inode);
968 return status;
971 int ocfs2_ioctl_move_extents(struct file *filp, void __user *argp)
973 int status;
975 struct inode *inode = file_inode(filp);
976 struct ocfs2_move_extents range;
977 struct ocfs2_move_extents_context *context;
979 if (!argp)
980 return -EINVAL;
982 status = mnt_want_write_file(filp);
983 if (status)
984 return status;
986 if ((!S_ISREG(inode->i_mode)) || !(filp->f_mode & FMODE_WRITE)) {
987 status = -EPERM;
988 goto out_drop;
991 if (inode->i_flags & (S_IMMUTABLE|S_APPEND)) {
992 status = -EPERM;
993 goto out_drop;
996 context = kzalloc(sizeof(struct ocfs2_move_extents_context), GFP_NOFS);
997 if (!context) {
998 status = -ENOMEM;
999 mlog_errno(status);
1000 goto out_drop;
1003 context->inode = inode;
1004 context->file = filp;
1006 if (copy_from_user(&range, argp, sizeof(range))) {
1007 status = -EFAULT;
1008 goto out_free;
1011 if (range.me_start > i_size_read(inode)) {
1012 status = -EINVAL;
1013 goto out_free;
1016 if (range.me_start + range.me_len > i_size_read(inode))
1017 range.me_len = i_size_read(inode) - range.me_start;
1019 context->range = &range;
1021 if (range.me_flags & OCFS2_MOVE_EXT_FL_AUTO_DEFRAG) {
1022 context->auto_defrag = 1;
1024 * ok, the default theshold for the defragmentation
1025 * is 1M, since our maximum clustersize was 1M also.
1026 * any thought?
1028 if (!range.me_threshold)
1029 range.me_threshold = 1024 * 1024;
1031 if (range.me_threshold > i_size_read(inode))
1032 range.me_threshold = i_size_read(inode);
1034 if (range.me_flags & OCFS2_MOVE_EXT_FL_PART_DEFRAG)
1035 context->partial = 1;
1036 } else {
1038 * first best-effort attempt to validate and adjust the goal
1039 * (physical address in block), while it can't guarantee later
1040 * operation can succeed all the time since global_bitmap may
1041 * change a bit over time.
1044 status = ocfs2_validate_and_adjust_move_goal(inode, &range);
1045 if (status)
1046 goto out_copy;
1049 status = ocfs2_move_extents(context);
1050 if (status)
1051 mlog_errno(status);
1052 out_copy:
1054 * movement/defragmentation may end up being partially completed,
1055 * that's the reason why we need to return userspace the finished
1056 * length and new_offset even if failure happens somewhere.
1058 if (copy_to_user(argp, &range, sizeof(range)))
1059 status = -EFAULT;
1061 out_free:
1062 kfree(context);
1063 out_drop:
1064 mnt_drop_write_file(filp);
1066 return status;