GNU Linux-libre 4.19.211-gnu1
[releases.git] / fs / ocfs2 / move_extents.c
1 /* -*- mode: c; c-basic-offset: 8; -*-
2  * vim: noexpandtab sw=8 ts=8 sts=0:
3  *
4  * move_extents.c
5  *
6  * Copyright (C) 2011 Oracle.  All rights reserved.
7  *
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.
11  *
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.
16  */
17 #include <linux/fs.h>
18 #include <linux/types.h>
19 #include <linux/mount.h>
20 #include <linux/swap.h>
21
22 #include <cluster/masklog.h>
23
24 #include "ocfs2.h"
25 #include "ocfs2_ioctl.h"
26
27 #include "alloc.h"
28 #include "localalloc.h"
29 #include "aops.h"
30 #include "dlmglue.h"
31 #include "extent_map.h"
32 #include "inode.h"
33 #include "journal.h"
34 #include "suballoc.h"
35 #include "uptodate.h"
36 #include "super.h"
37 #include "dir.h"
38 #include "buffer_head_io.h"
39 #include "sysfile.h"
40 #include "refcounttree.h"
41 #include "move_extents.h"
42
43 struct ocfs2_move_extents_context {
44         struct inode *inode;
45         struct file *file;
46         int auto_defrag;
47         int partial;
48         int credits;
49         u32 new_phys_cpos;
50         u32 clusters_moved;
51         u64 refcount_loc;
52         struct ocfs2_move_extents *range;
53         struct ocfs2_extent_tree et;
54         struct ocfs2_alloc_context *meta_ac;
55         struct ocfs2_alloc_context *data_ac;
56         struct ocfs2_cached_dealloc_ctxt dealloc;
57 };
58
59 static int __ocfs2_move_extent(handle_t *handle,
60                                struct ocfs2_move_extents_context *context,
61                                u32 cpos, u32 len, u32 p_cpos, u32 new_p_cpos,
62                                int ext_flags)
63 {
64         int ret = 0, index;
65         struct inode *inode = context->inode;
66         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
67         struct ocfs2_extent_rec *rec, replace_rec;
68         struct ocfs2_path *path = NULL;
69         struct ocfs2_extent_list *el;
70         u64 ino = ocfs2_metadata_cache_owner(context->et.et_ci);
71         u64 old_blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cpos);
72
73         ret = ocfs2_duplicate_clusters_by_page(handle, inode, cpos,
74                                                p_cpos, new_p_cpos, len);
75         if (ret) {
76                 mlog_errno(ret);
77                 goto out;
78         }
79
80         memset(&replace_rec, 0, sizeof(replace_rec));
81         replace_rec.e_cpos = cpu_to_le32(cpos);
82         replace_rec.e_leaf_clusters = cpu_to_le16(len);
83         replace_rec.e_blkno = cpu_to_le64(ocfs2_clusters_to_blocks(inode->i_sb,
84                                                                    new_p_cpos));
85
86         path = ocfs2_new_path_from_et(&context->et);
87         if (!path) {
88                 ret = -ENOMEM;
89                 mlog_errno(ret);
90                 goto out;
91         }
92
93         ret = ocfs2_find_path(INODE_CACHE(inode), path, cpos);
94         if (ret) {
95                 mlog_errno(ret);
96                 goto out;
97         }
98
99         el = path_leaf_el(path);
100
101         index = ocfs2_search_extent_list(el, cpos);
102         if (index == -1) {
103                 ret = ocfs2_error(inode->i_sb,
104                                   "Inode %llu has an extent at cpos %u which can no longer be found\n",
105                                   (unsigned long long)ino, cpos);
106                 goto out;
107         }
108
109         rec = &el->l_recs[index];
110
111         BUG_ON(ext_flags != rec->e_flags);
112         /*
113          * after moving/defraging to new location, the extent is not going
114          * to be refcounted anymore.
115          */
116         replace_rec.e_flags = ext_flags & ~OCFS2_EXT_REFCOUNTED;
117
118         ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode),
119                                       context->et.et_root_bh,
120                                       OCFS2_JOURNAL_ACCESS_WRITE);
121         if (ret) {
122                 mlog_errno(ret);
123                 goto out;
124         }
125
126         ret = ocfs2_split_extent(handle, &context->et, path, index,
127                                  &replace_rec, context->meta_ac,
128                                  &context->dealloc);
129         if (ret) {
130                 mlog_errno(ret);
131                 goto out;
132         }
133
134         ocfs2_journal_dirty(handle, context->et.et_root_bh);
135
136         context->new_phys_cpos = new_p_cpos;
137
138         /*
139          * need I to append truncate log for old clusters?
140          */
141         if (old_blkno) {
142                 if (ext_flags & OCFS2_EXT_REFCOUNTED)
143                         ret = ocfs2_decrease_refcount(inode, handle,
144                                         ocfs2_blocks_to_clusters(osb->sb,
145                                                                  old_blkno),
146                                         len, context->meta_ac,
147                                         &context->dealloc, 1);
148                 else
149                         ret = ocfs2_truncate_log_append(osb, handle,
150                                                         old_blkno, len);
151         }
152
153         ocfs2_update_inode_fsync_trans(handle, inode, 0);
154 out:
155         ocfs2_free_path(path);
156         return ret;
157 }
158
159 /*
160  * lock allocator, and reserve appropriate number of bits for
161  * meta blocks.
162  */
163 static int ocfs2_lock_meta_allocator_move_extents(struct inode *inode,
164                                         struct ocfs2_extent_tree *et,
165                                         u32 clusters_to_move,
166                                         u32 extents_to_split,
167                                         struct ocfs2_alloc_context **meta_ac,
168                                         int extra_blocks,
169                                         int *credits)
170 {
171         int ret, num_free_extents;
172         unsigned int max_recs_needed = 2 * extents_to_split + clusters_to_move;
173         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
174
175         num_free_extents = ocfs2_num_free_extents(et);
176         if (num_free_extents < 0) {
177                 ret = num_free_extents;
178                 mlog_errno(ret);
179                 goto out;
180         }
181
182         if (!num_free_extents ||
183             (ocfs2_sparse_alloc(osb) && num_free_extents < max_recs_needed))
184                 extra_blocks += ocfs2_extend_meta_needed(et->et_root_el);
185
186         ret = ocfs2_reserve_new_metadata_blocks(osb, extra_blocks, meta_ac);
187         if (ret) {
188                 mlog_errno(ret);
189                 goto out;
190         }
191
192
193         *credits += ocfs2_calc_extend_credits(osb->sb, et->et_root_el);
194
195         mlog(0, "reserve metadata_blocks: %d, data_clusters: %u, credits: %d\n",
196              extra_blocks, clusters_to_move, *credits);
197 out:
198         if (ret) {
199                 if (*meta_ac) {
200                         ocfs2_free_alloc_context(*meta_ac);
201                         *meta_ac = NULL;
202                 }
203         }
204
205         return ret;
206 }
207
208 /*
209  * Using one journal handle to guarantee the data consistency in case
210  * crash happens anywhere.
211  *
212  *  XXX: defrag can end up with finishing partial extent as requested,
213  * due to not enough contiguous clusters can be found in allocator.
214  */
215 static int ocfs2_defrag_extent(struct ocfs2_move_extents_context *context,
216                                u32 cpos, u32 phys_cpos, u32 *len, int ext_flags)
217 {
218         int ret, credits = 0, extra_blocks = 0, partial = context->partial;
219         handle_t *handle;
220         struct inode *inode = context->inode;
221         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
222         struct inode *tl_inode = osb->osb_tl_inode;
223         struct ocfs2_refcount_tree *ref_tree = NULL;
224         u32 new_phys_cpos, new_len;
225         u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
226         int need_free = 0;
227
228         if ((ext_flags & OCFS2_EXT_REFCOUNTED) && *len) {
229                 BUG_ON(!ocfs2_is_refcount_inode(inode));
230                 BUG_ON(!context->refcount_loc);
231
232                 ret = ocfs2_lock_refcount_tree(osb, context->refcount_loc, 1,
233                                                &ref_tree, NULL);
234                 if (ret) {
235                         mlog_errno(ret);
236                         return ret;
237                 }
238
239                 ret = ocfs2_prepare_refcount_change_for_del(inode,
240                                                         context->refcount_loc,
241                                                         phys_blkno,
242                                                         *len,
243                                                         &credits,
244                                                         &extra_blocks);
245                 if (ret) {
246                         mlog_errno(ret);
247                         goto out;
248                 }
249         }
250
251         ret = ocfs2_lock_meta_allocator_move_extents(inode, &context->et,
252                                                 *len, 1,
253                                                 &context->meta_ac,
254                                                 extra_blocks, &credits);
255         if (ret) {
256                 mlog_errno(ret);
257                 goto out;
258         }
259
260         /*
261          * should be using allocation reservation strategy there?
262          *
263          * if (context->data_ac)
264          *      context->data_ac->ac_resv = &OCFS2_I(inode)->ip_la_data_resv;
265          */
266
267         inode_lock(tl_inode);
268
269         if (ocfs2_truncate_log_needs_flush(osb)) {
270                 ret = __ocfs2_flush_truncate_log(osb);
271                 if (ret < 0) {
272                         mlog_errno(ret);
273                         goto out_unlock_mutex;
274                 }
275         }
276
277         /*
278          * Make sure ocfs2_reserve_cluster is called after
279          * __ocfs2_flush_truncate_log, otherwise, dead lock may happen.
280          *
281          * If ocfs2_reserve_cluster is called
282          * before __ocfs2_flush_truncate_log, dead lock on global bitmap
283          * may happen.
284          *
285          */
286         ret = ocfs2_reserve_clusters(osb, *len, &context->data_ac);
287         if (ret) {
288                 mlog_errno(ret);
289                 goto out_unlock_mutex;
290         }
291
292         handle = ocfs2_start_trans(osb, credits);
293         if (IS_ERR(handle)) {
294                 ret = PTR_ERR(handle);
295                 mlog_errno(ret);
296                 goto out_unlock_mutex;
297         }
298
299         ret = __ocfs2_claim_clusters(handle, context->data_ac, 1, *len,
300                                      &new_phys_cpos, &new_len);
301         if (ret) {
302                 mlog_errno(ret);
303                 goto out_commit;
304         }
305
306         /*
307          * allowing partial extent moving is kind of 'pros and cons', it makes
308          * whole defragmentation less likely to fail, on the contrary, the bad
309          * thing is it may make the fs even more fragmented after moving, let
310          * userspace make a good decision here.
311          */
312         if (new_len != *len) {
313                 mlog(0, "len_claimed: %u, len: %u\n", new_len, *len);
314                 if (!partial) {
315                         context->range->me_flags &= ~OCFS2_MOVE_EXT_FL_COMPLETE;
316                         ret = -ENOSPC;
317                         need_free = 1;
318                         goto out_commit;
319                 }
320         }
321
322         mlog(0, "cpos: %u, phys_cpos: %u, new_phys_cpos: %u\n", cpos,
323              phys_cpos, new_phys_cpos);
324
325         ret = __ocfs2_move_extent(handle, context, cpos, new_len, phys_cpos,
326                                   new_phys_cpos, ext_flags);
327         if (ret)
328                 mlog_errno(ret);
329
330         if (partial && (new_len != *len))
331                 *len = new_len;
332
333         /*
334          * Here we should write the new page out first if we are
335          * in write-back mode.
336          */
337         ret = ocfs2_cow_sync_writeback(inode->i_sb, context->inode, cpos, *len);
338         if (ret)
339                 mlog_errno(ret);
340
341 out_commit:
342         if (need_free && context->data_ac) {
343                 struct ocfs2_alloc_context *data_ac = context->data_ac;
344
345                 if (context->data_ac->ac_which == OCFS2_AC_USE_LOCAL)
346                         ocfs2_free_local_alloc_bits(osb, handle, data_ac,
347                                         new_phys_cpos, new_len);
348                 else
349                         ocfs2_free_clusters(handle,
350                                         data_ac->ac_inode,
351                                         data_ac->ac_bh,
352                                         ocfs2_clusters_to_blocks(osb->sb, new_phys_cpos),
353                                         new_len);
354         }
355
356         ocfs2_commit_trans(osb, handle);
357
358 out_unlock_mutex:
359         inode_unlock(tl_inode);
360
361         if (context->data_ac) {
362                 ocfs2_free_alloc_context(context->data_ac);
363                 context->data_ac = NULL;
364         }
365
366         if (context->meta_ac) {
367                 ocfs2_free_alloc_context(context->meta_ac);
368                 context->meta_ac = NULL;
369         }
370
371 out:
372         if (ref_tree)
373                 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
374
375         return ret;
376 }
377
378 /*
379  * find the victim alloc group, where #blkno fits.
380  */
381 static int ocfs2_find_victim_alloc_group(struct inode *inode,
382                                          u64 vict_blkno,
383                                          int type, int slot,
384                                          int *vict_bit,
385                                          struct buffer_head **ret_bh)
386 {
387         int ret, i, bits_per_unit = 0;
388         u64 blkno;
389         char namebuf[40];
390
391         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
392         struct buffer_head *ac_bh = NULL, *gd_bh = NULL;
393         struct ocfs2_chain_list *cl;
394         struct ocfs2_chain_rec *rec;
395         struct ocfs2_dinode *ac_dinode;
396         struct ocfs2_group_desc *bg;
397
398         ocfs2_sprintf_system_inode_name(namebuf, sizeof(namebuf), type, slot);
399         ret = ocfs2_lookup_ino_from_name(osb->sys_root_inode, namebuf,
400                                          strlen(namebuf), &blkno);
401         if (ret) {
402                 ret = -ENOENT;
403                 goto out;
404         }
405
406         ret = ocfs2_read_blocks_sync(osb, blkno, 1, &ac_bh);
407         if (ret) {
408                 mlog_errno(ret);
409                 goto out;
410         }
411
412         ac_dinode = (struct ocfs2_dinode *)ac_bh->b_data;
413         cl = &(ac_dinode->id2.i_chain);
414         rec = &(cl->cl_recs[0]);
415
416         if (type == GLOBAL_BITMAP_SYSTEM_INODE)
417                 bits_per_unit = osb->s_clustersize_bits -
418                                         inode->i_sb->s_blocksize_bits;
419         /*
420          * 'vict_blkno' was out of the valid range.
421          */
422         if ((vict_blkno < le64_to_cpu(rec->c_blkno)) ||
423             (vict_blkno >= ((u64)le32_to_cpu(ac_dinode->id1.bitmap1.i_total) <<
424                                 bits_per_unit))) {
425                 ret = -EINVAL;
426                 goto out;
427         }
428
429         for (i = 0; i < le16_to_cpu(cl->cl_next_free_rec); i++) {
430
431                 rec = &(cl->cl_recs[i]);
432                 if (!rec)
433                         continue;
434
435                 bg = NULL;
436
437                 do {
438                         if (!bg)
439                                 blkno = le64_to_cpu(rec->c_blkno);
440                         else
441                                 blkno = le64_to_cpu(bg->bg_next_group);
442
443                         if (gd_bh) {
444                                 brelse(gd_bh);
445                                 gd_bh = NULL;
446                         }
447
448                         ret = ocfs2_read_blocks_sync(osb, blkno, 1, &gd_bh);
449                         if (ret) {
450                                 mlog_errno(ret);
451                                 goto out;
452                         }
453
454                         bg = (struct ocfs2_group_desc *)gd_bh->b_data;
455
456                         if (vict_blkno < (le64_to_cpu(bg->bg_blkno) +
457                                                 le16_to_cpu(bg->bg_bits))) {
458
459                                 *ret_bh = gd_bh;
460                                 *vict_bit = (vict_blkno - blkno) >>
461                                                         bits_per_unit;
462                                 mlog(0, "find the victim group: #%llu, "
463                                      "total_bits: %u, vict_bit: %u\n",
464                                      blkno, le16_to_cpu(bg->bg_bits),
465                                      *vict_bit);
466                                 goto out;
467                         }
468
469                 } while (le64_to_cpu(bg->bg_next_group));
470         }
471
472         ret = -EINVAL;
473 out:
474         brelse(ac_bh);
475
476         /*
477          * caller has to release the gd_bh properly.
478          */
479         return ret;
480 }
481
482 /*
483  * XXX: helper to validate and adjust moving goal.
484  */
485 static int ocfs2_validate_and_adjust_move_goal(struct inode *inode,
486                                                struct ocfs2_move_extents *range)
487 {
488         int ret, goal_bit = 0;
489
490         struct buffer_head *gd_bh = NULL;
491         struct ocfs2_group_desc *bg;
492         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
493         int c_to_b = 1 << (osb->s_clustersize_bits -
494                                         inode->i_sb->s_blocksize_bits);
495
496         /*
497          * make goal become cluster aligned.
498          */
499         range->me_goal = ocfs2_block_to_cluster_start(inode->i_sb,
500                                                       range->me_goal);
501         /*
502          * validate goal sits within global_bitmap, and return the victim
503          * group desc
504          */
505         ret = ocfs2_find_victim_alloc_group(inode, range->me_goal,
506                                             GLOBAL_BITMAP_SYSTEM_INODE,
507                                             OCFS2_INVALID_SLOT,
508                                             &goal_bit, &gd_bh);
509         if (ret)
510                 goto out;
511
512         bg = (struct ocfs2_group_desc *)gd_bh->b_data;
513
514         /*
515          * moving goal is not allowd to start with a group desc blok(#0 blk)
516          * let's compromise to the latter cluster.
517          */
518         if (range->me_goal == le64_to_cpu(bg->bg_blkno))
519                 range->me_goal += c_to_b;
520
521         /*
522          * movement is not gonna cross two groups.
523          */
524         if ((le16_to_cpu(bg->bg_bits) - goal_bit) * osb->s_clustersize <
525                                                                 range->me_len) {
526                 ret = -EINVAL;
527                 goto out;
528         }
529         /*
530          * more exact validations/adjustments will be performed later during
531          * moving operation for each extent range.
532          */
533         mlog(0, "extents get ready to be moved to #%llu block\n",
534              range->me_goal);
535
536 out:
537         brelse(gd_bh);
538
539         return ret;
540 }
541
542 static void ocfs2_probe_alloc_group(struct inode *inode, struct buffer_head *bh,
543                                     int *goal_bit, u32 move_len, u32 max_hop,
544                                     u32 *phys_cpos)
545 {
546         int i, used, last_free_bits = 0, base_bit = *goal_bit;
547         struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data;
548         u32 base_cpos = ocfs2_blocks_to_clusters(inode->i_sb,
549                                                  le64_to_cpu(gd->bg_blkno));
550
551         for (i = base_bit; i < le16_to_cpu(gd->bg_bits); i++) {
552
553                 used = ocfs2_test_bit(i, (unsigned long *)gd->bg_bitmap);
554                 if (used) {
555                         /*
556                          * we even tried searching the free chunk by jumping
557                          * a 'max_hop' distance, but still failed.
558                          */
559                         if ((i - base_bit) > max_hop) {
560                                 *phys_cpos = 0;
561                                 break;
562                         }
563
564                         if (last_free_bits)
565                                 last_free_bits = 0;
566
567                         continue;
568                 } else
569                         last_free_bits++;
570
571                 if (last_free_bits == move_len) {
572                         *goal_bit = i;
573                         *phys_cpos = base_cpos + i;
574                         break;
575                 }
576         }
577
578         mlog(0, "found phys_cpos: %u to fit the wanted moving.\n", *phys_cpos);
579 }
580
581 static int ocfs2_move_extent(struct ocfs2_move_extents_context *context,
582                              u32 cpos, u32 phys_cpos, u32 *new_phys_cpos,
583                              u32 len, int ext_flags)
584 {
585         int ret, credits = 0, extra_blocks = 0, goal_bit = 0;
586         handle_t *handle;
587         struct inode *inode = context->inode;
588         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
589         struct inode *tl_inode = osb->osb_tl_inode;
590         struct inode *gb_inode = NULL;
591         struct buffer_head *gb_bh = NULL;
592         struct buffer_head *gd_bh = NULL;
593         struct ocfs2_group_desc *gd;
594         struct ocfs2_refcount_tree *ref_tree = NULL;
595         u32 move_max_hop = ocfs2_blocks_to_clusters(inode->i_sb,
596                                                     context->range->me_threshold);
597         u64 phys_blkno, new_phys_blkno;
598
599         phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
600
601         if ((ext_flags & OCFS2_EXT_REFCOUNTED) && len) {
602                 BUG_ON(!ocfs2_is_refcount_inode(inode));
603                 BUG_ON(!context->refcount_loc);
604
605                 ret = ocfs2_lock_refcount_tree(osb, context->refcount_loc, 1,
606                                                &ref_tree, NULL);
607                 if (ret) {
608                         mlog_errno(ret);
609                         return ret;
610                 }
611
612                 ret = ocfs2_prepare_refcount_change_for_del(inode,
613                                                         context->refcount_loc,
614                                                         phys_blkno,
615                                                         len,
616                                                         &credits,
617                                                         &extra_blocks);
618                 if (ret) {
619                         mlog_errno(ret);
620                         goto out;
621                 }
622         }
623
624         ret = ocfs2_lock_meta_allocator_move_extents(inode, &context->et,
625                                                 len, 1,
626                                                 &context->meta_ac,
627                                                 extra_blocks, &credits);
628         if (ret) {
629                 mlog_errno(ret);
630                 goto out;
631         }
632
633         /*
634          * need to count 2 extra credits for global_bitmap inode and
635          * group descriptor.
636          */
637         credits += OCFS2_INODE_UPDATE_CREDITS + 1;
638
639         /*
640          * ocfs2_move_extent() didn't reserve any clusters in lock_allocators()
641          * logic, while we still need to lock the global_bitmap.
642          */
643         gb_inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE,
644                                                OCFS2_INVALID_SLOT);
645         if (!gb_inode) {
646                 mlog(ML_ERROR, "unable to get global_bitmap inode\n");
647                 ret = -EIO;
648                 goto out;
649         }
650
651         inode_lock(gb_inode);
652
653         ret = ocfs2_inode_lock(gb_inode, &gb_bh, 1);
654         if (ret) {
655                 mlog_errno(ret);
656                 goto out_unlock_gb_mutex;
657         }
658
659         inode_lock(tl_inode);
660
661         handle = ocfs2_start_trans(osb, credits);
662         if (IS_ERR(handle)) {
663                 ret = PTR_ERR(handle);
664                 mlog_errno(ret);
665                 goto out_unlock_tl_inode;
666         }
667
668         new_phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, *new_phys_cpos);
669         ret = ocfs2_find_victim_alloc_group(inode, new_phys_blkno,
670                                             GLOBAL_BITMAP_SYSTEM_INODE,
671                                             OCFS2_INVALID_SLOT,
672                                             &goal_bit, &gd_bh);
673         if (ret) {
674                 mlog_errno(ret);
675                 goto out_commit;
676         }
677
678         /*
679          * probe the victim cluster group to find a proper
680          * region to fit wanted movement, it even will perfrom
681          * a best-effort attempt by compromising to a threshold
682          * around the goal.
683          */
684         ocfs2_probe_alloc_group(inode, gd_bh, &goal_bit, len, move_max_hop,
685                                 new_phys_cpos);
686         if (!*new_phys_cpos) {
687                 ret = -ENOSPC;
688                 goto out_commit;
689         }
690
691         ret = __ocfs2_move_extent(handle, context, cpos, len, phys_cpos,
692                                   *new_phys_cpos, ext_flags);
693         if (ret) {
694                 mlog_errno(ret);
695                 goto out_commit;
696         }
697
698         gd = (struct ocfs2_group_desc *)gd_bh->b_data;
699         ret = ocfs2_alloc_dinode_update_counts(gb_inode, handle, gb_bh, len,
700                                                le16_to_cpu(gd->bg_chain));
701         if (ret) {
702                 mlog_errno(ret);
703                 goto out_commit;
704         }
705
706         ret = ocfs2_block_group_set_bits(handle, gb_inode, gd, gd_bh,
707                                          goal_bit, len);
708         if (ret) {
709                 ocfs2_rollback_alloc_dinode_counts(gb_inode, gb_bh, len,
710                                                le16_to_cpu(gd->bg_chain));
711                 mlog_errno(ret);
712         }
713
714         /*
715          * Here we should write the new page out first if we are
716          * in write-back mode.
717          */
718         ret = ocfs2_cow_sync_writeback(inode->i_sb, context->inode, cpos, len);
719         if (ret)
720                 mlog_errno(ret);
721
722 out_commit:
723         ocfs2_commit_trans(osb, handle);
724         brelse(gd_bh);
725
726 out_unlock_tl_inode:
727         inode_unlock(tl_inode);
728
729         ocfs2_inode_unlock(gb_inode, 1);
730 out_unlock_gb_mutex:
731         inode_unlock(gb_inode);
732         brelse(gb_bh);
733         iput(gb_inode);
734
735 out:
736         if (context->meta_ac) {
737                 ocfs2_free_alloc_context(context->meta_ac);
738                 context->meta_ac = NULL;
739         }
740
741         if (ref_tree)
742                 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
743
744         return ret;
745 }
746
747 /*
748  * Helper to calculate the defraging length in one run according to threshold.
749  */
750 static void ocfs2_calc_extent_defrag_len(u32 *alloc_size, u32 *len_defraged,
751                                          u32 threshold, int *skip)
752 {
753         if ((*alloc_size + *len_defraged) < threshold) {
754                 /*
755                  * proceed defragmentation until we meet the thresh
756                  */
757                 *len_defraged += *alloc_size;
758         } else if (*len_defraged == 0) {
759                 /*
760                  * XXX: skip a large extent.
761                  */
762                 *skip = 1;
763         } else {
764                 /*
765                  * split this extent to coalesce with former pieces as
766                  * to reach the threshold.
767                  *
768                  * we're done here with one cycle of defragmentation
769                  * in a size of 'thresh', resetting 'len_defraged'
770                  * forces a new defragmentation.
771                  */
772                 *alloc_size = threshold - *len_defraged;
773                 *len_defraged = 0;
774         }
775 }
776
777 static int __ocfs2_move_extents_range(struct buffer_head *di_bh,
778                                 struct ocfs2_move_extents_context *context)
779 {
780         int ret = 0, flags, do_defrag, skip = 0;
781         u32 cpos, phys_cpos, move_start, len_to_move, alloc_size;
782         u32 len_defraged = 0, defrag_thresh = 0, new_phys_cpos = 0;
783
784         struct inode *inode = context->inode;
785         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
786         struct ocfs2_move_extents *range = context->range;
787         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
788
789         if ((i_size_read(inode) == 0) || (range->me_len == 0))
790                 return 0;
791
792         if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
793                 return 0;
794
795         context->refcount_loc = le64_to_cpu(di->i_refcount_loc);
796
797         ocfs2_init_dinode_extent_tree(&context->et, INODE_CACHE(inode), di_bh);
798         ocfs2_init_dealloc_ctxt(&context->dealloc);
799
800         /*
801          * TO-DO XXX:
802          *
803          * - xattr extents.
804          */
805
806         do_defrag = context->auto_defrag;
807
808         /*
809          * extents moving happens in unit of clusters, for the sake
810          * of simplicity, we may ignore two clusters where 'byte_start'
811          * and 'byte_start + len' were within.
812          */
813         move_start = ocfs2_clusters_for_bytes(osb->sb, range->me_start);
814         len_to_move = (range->me_start + range->me_len) >>
815                                                 osb->s_clustersize_bits;
816         if (len_to_move >= move_start)
817                 len_to_move -= move_start;
818         else
819                 len_to_move = 0;
820
821         if (do_defrag) {
822                 defrag_thresh = range->me_threshold >> osb->s_clustersize_bits;
823                 if (defrag_thresh <= 1)
824                         goto done;
825         } else
826                 new_phys_cpos = ocfs2_blocks_to_clusters(inode->i_sb,
827                                                          range->me_goal);
828
829         mlog(0, "Inode: %llu, start: %llu, len: %llu, cstart: %u, clen: %u, "
830              "thresh: %u\n",
831              (unsigned long long)OCFS2_I(inode)->ip_blkno,
832              (unsigned long long)range->me_start,
833              (unsigned long long)range->me_len,
834              move_start, len_to_move, defrag_thresh);
835
836         cpos = move_start;
837         while (len_to_move) {
838                 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &alloc_size,
839                                          &flags);
840                 if (ret) {
841                         mlog_errno(ret);
842                         goto out;
843                 }
844
845                 if (alloc_size > len_to_move)
846                         alloc_size = len_to_move;
847
848                 /*
849                  * XXX: how to deal with a hole:
850                  *
851                  * - skip the hole of course
852                  * - force a new defragmentation
853                  */
854                 if (!phys_cpos) {
855                         if (do_defrag)
856                                 len_defraged = 0;
857
858                         goto next;
859                 }
860
861                 if (do_defrag) {
862                         ocfs2_calc_extent_defrag_len(&alloc_size, &len_defraged,
863                                                      defrag_thresh, &skip);
864                         /*
865                          * skip large extents
866                          */
867                         if (skip) {
868                                 skip = 0;
869                                 goto next;
870                         }
871
872                         mlog(0, "#Defrag: cpos: %u, phys_cpos: %u, "
873                              "alloc_size: %u, len_defraged: %u\n",
874                              cpos, phys_cpos, alloc_size, len_defraged);
875
876                         ret = ocfs2_defrag_extent(context, cpos, phys_cpos,
877                                                   &alloc_size, flags);
878                 } else {
879                         ret = ocfs2_move_extent(context, cpos, phys_cpos,
880                                                 &new_phys_cpos, alloc_size,
881                                                 flags);
882
883                         new_phys_cpos += alloc_size;
884                 }
885
886                 if (ret < 0) {
887                         mlog_errno(ret);
888                         goto out;
889                 }
890
891                 context->clusters_moved += alloc_size;
892 next:
893                 cpos += alloc_size;
894                 len_to_move -= alloc_size;
895         }
896
897 done:
898         range->me_flags |= OCFS2_MOVE_EXT_FL_COMPLETE;
899
900 out:
901         range->me_moved_len = ocfs2_clusters_to_bytes(osb->sb,
902                                                       context->clusters_moved);
903         range->me_new_offset = ocfs2_clusters_to_bytes(osb->sb,
904                                                        context->new_phys_cpos);
905
906         ocfs2_schedule_truncate_log_flush(osb, 1);
907         ocfs2_run_deallocs(osb, &context->dealloc);
908
909         return ret;
910 }
911
912 static int ocfs2_move_extents(struct ocfs2_move_extents_context *context)
913 {
914         int status;
915         handle_t *handle;
916         struct inode *inode = context->inode;
917         struct ocfs2_dinode *di;
918         struct buffer_head *di_bh = NULL;
919         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
920
921         if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
922                 return -EROFS;
923
924         inode_lock(inode);
925
926         /*
927          * This prevents concurrent writes from other nodes
928          */
929         status = ocfs2_rw_lock(inode, 1);
930         if (status) {
931                 mlog_errno(status);
932                 goto out;
933         }
934
935         status = ocfs2_inode_lock(inode, &di_bh, 1);
936         if (status) {
937                 mlog_errno(status);
938                 goto out_rw_unlock;
939         }
940
941         /*
942          * rememer ip_xattr_sem also needs to be held if necessary
943          */
944         down_write(&OCFS2_I(inode)->ip_alloc_sem);
945
946         status = __ocfs2_move_extents_range(di_bh, context);
947
948         up_write(&OCFS2_I(inode)->ip_alloc_sem);
949         if (status) {
950                 mlog_errno(status);
951                 goto out_inode_unlock;
952         }
953
954         /*
955          * We update ctime for these changes
956          */
957         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
958         if (IS_ERR(handle)) {
959                 status = PTR_ERR(handle);
960                 mlog_errno(status);
961                 goto out_inode_unlock;
962         }
963
964         status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
965                                          OCFS2_JOURNAL_ACCESS_WRITE);
966         if (status) {
967                 mlog_errno(status);
968                 goto out_commit;
969         }
970
971         di = (struct ocfs2_dinode *)di_bh->b_data;
972         inode->i_ctime = current_time(inode);
973         di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
974         di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
975         ocfs2_update_inode_fsync_trans(handle, inode, 0);
976
977         ocfs2_journal_dirty(handle, di_bh);
978
979 out_commit:
980         ocfs2_commit_trans(osb, handle);
981
982 out_inode_unlock:
983         brelse(di_bh);
984         ocfs2_inode_unlock(inode, 1);
985 out_rw_unlock:
986         ocfs2_rw_unlock(inode, 1);
987 out:
988         inode_unlock(inode);
989
990         return status;
991 }
992
993 int ocfs2_ioctl_move_extents(struct file *filp, void __user *argp)
994 {
995         int status;
996
997         struct inode *inode = file_inode(filp);
998         struct ocfs2_move_extents range;
999         struct ocfs2_move_extents_context *context;
1000
1001         if (!argp)
1002                 return -EINVAL;
1003
1004         status = mnt_want_write_file(filp);
1005         if (status)
1006                 return status;
1007
1008         if ((!S_ISREG(inode->i_mode)) || !(filp->f_mode & FMODE_WRITE)) {
1009                 status = -EPERM;
1010                 goto out_drop;
1011         }
1012
1013         if (inode->i_flags & (S_IMMUTABLE|S_APPEND)) {
1014                 status = -EPERM;
1015                 goto out_drop;
1016         }
1017
1018         context = kzalloc(sizeof(struct ocfs2_move_extents_context), GFP_NOFS);
1019         if (!context) {
1020                 status = -ENOMEM;
1021                 mlog_errno(status);
1022                 goto out_drop;
1023         }
1024
1025         context->inode = inode;
1026         context->file = filp;
1027
1028         if (copy_from_user(&range, argp, sizeof(range))) {
1029                 status = -EFAULT;
1030                 goto out_free;
1031         }
1032
1033         if (range.me_start > i_size_read(inode)) {
1034                 status = -EINVAL;
1035                 goto out_free;
1036         }
1037
1038         if (range.me_start + range.me_len > i_size_read(inode))
1039                         range.me_len = i_size_read(inode) - range.me_start;
1040
1041         context->range = &range;
1042
1043         if (range.me_flags & OCFS2_MOVE_EXT_FL_AUTO_DEFRAG) {
1044                 context->auto_defrag = 1;
1045                 /*
1046                  * ok, the default theshold for the defragmentation
1047                  * is 1M, since our maximum clustersize was 1M also.
1048                  * any thought?
1049                  */
1050                 if (!range.me_threshold)
1051                         range.me_threshold = 1024 * 1024;
1052
1053                 if (range.me_threshold > i_size_read(inode))
1054                         range.me_threshold = i_size_read(inode);
1055
1056                 if (range.me_flags & OCFS2_MOVE_EXT_FL_PART_DEFRAG)
1057                         context->partial = 1;
1058         } else {
1059                 /*
1060                  * first best-effort attempt to validate and adjust the goal
1061                  * (physical address in block), while it can't guarantee later
1062                  * operation can succeed all the time since global_bitmap may
1063                  * change a bit over time.
1064                  */
1065
1066                 status = ocfs2_validate_and_adjust_move_goal(inode, &range);
1067                 if (status)
1068                         goto out_copy;
1069         }
1070
1071         status = ocfs2_move_extents(context);
1072         if (status)
1073                 mlog_errno(status);
1074 out_copy:
1075         /*
1076          * movement/defragmentation may end up being partially completed,
1077          * that's the reason why we need to return userspace the finished
1078          * length and new_offset even if failure happens somewhere.
1079          */
1080         if (copy_to_user(argp, &range, sizeof(range)))
1081                 status = -EFAULT;
1082
1083 out_free:
1084         kfree(context);
1085 out_drop:
1086         mnt_drop_write_file(filp);
1087
1088         return status;
1089 }