1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
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.
18 #include <linux/types.h>
19 #include <linux/mount.h>
20 #include <linux/swap.h>
22 #include <cluster/masklog.h>
25 #include "ocfs2_ioctl.h"
30 #include "extent_map.h"
37 #include "buffer_head_io.h"
39 #include "refcounttree.h"
40 #include "move_extents.h"
42 struct ocfs2_move_extents_context {
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,
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);
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,
85 path = ocfs2_new_path_from_et(&context->et);
92 ret = ocfs2_find_path(INODE_CACHE(inode), path, cpos);
98 el = path_leaf_el(path);
100 index = ocfs2_search_extent_list(el, cpos);
101 if (index == -1 || index >= le16_to_cpu(el->l_next_free_rec)) {
102 ocfs2_error(inode->i_sb,
103 "Inode %llu has an extent at cpos %u which can no "
104 "longer be found.\n",
105 (unsigned long long)ino, cpos);
110 rec = &el->l_recs[index];
112 BUG_ON(ext_flags != rec->e_flags);
114 * after moving/defraging to new location, the extent is not going
115 * to be refcounted anymore.
117 replace_rec.e_flags = ext_flags & ~OCFS2_EXT_REFCOUNTED;
119 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode),
120 context->et.et_root_bh,
121 OCFS2_JOURNAL_ACCESS_WRITE);
127 ret = ocfs2_split_extent(handle, &context->et, path, index,
128 &replace_rec, context->meta_ac,
135 ocfs2_journal_dirty(handle, context->et.et_root_bh);
137 context->new_phys_cpos = new_p_cpos;
140 * need I to append truncate log for old clusters?
143 if (ext_flags & OCFS2_EXT_REFCOUNTED)
144 ret = ocfs2_decrease_refcount(inode, handle,
145 ocfs2_blocks_to_clusters(osb->sb,
147 len, context->meta_ac,
148 &context->dealloc, 1);
150 ret = ocfs2_truncate_log_append(osb, handle,
155 ocfs2_free_path(path);
160 * lock allocators, and reserving appropriate number of bits for
161 * meta blocks and data clusters.
163 * in some cases, we don't need to reserve clusters, just let data_ac
166 static int ocfs2_lock_allocators_move_extents(struct inode *inode,
167 struct ocfs2_extent_tree *et,
168 u32 clusters_to_move,
169 u32 extents_to_split,
170 struct ocfs2_alloc_context **meta_ac,
171 struct ocfs2_alloc_context **data_ac,
175 int ret, num_free_extents;
176 unsigned int max_recs_needed = 2 * extents_to_split + clusters_to_move;
177 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
179 num_free_extents = ocfs2_num_free_extents(osb, et);
180 if (num_free_extents < 0) {
181 ret = num_free_extents;
186 if (!num_free_extents ||
187 (ocfs2_sparse_alloc(osb) && num_free_extents < max_recs_needed))
188 extra_blocks += ocfs2_extend_meta_needed(et->et_root_el);
190 ret = ocfs2_reserve_new_metadata_blocks(osb, extra_blocks, meta_ac);
197 ret = ocfs2_reserve_clusters(osb, clusters_to_move, data_ac);
204 *credits += ocfs2_calc_extend_credits(osb->sb, et->et_root_el);
206 mlog(0, "reserve metadata_blocks: %d, data_clusters: %u, credits: %d\n",
207 extra_blocks, clusters_to_move, *credits);
211 ocfs2_free_alloc_context(*meta_ac);
220 * Using one journal handle to guarantee the data consistency in case
221 * crash happens anywhere.
223 * XXX: defrag can end up with finishing partial extent as requested,
224 * due to not enough contiguous clusters can be found in allocator.
226 static int ocfs2_defrag_extent(struct ocfs2_move_extents_context *context,
227 u32 cpos, u32 phys_cpos, u32 *len, int ext_flags)
229 int ret, credits = 0, extra_blocks = 0, partial = context->partial;
231 struct inode *inode = context->inode;
232 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
233 struct inode *tl_inode = osb->osb_tl_inode;
234 struct ocfs2_refcount_tree *ref_tree = NULL;
235 u32 new_phys_cpos, new_len;
236 u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
238 if ((ext_flags & OCFS2_EXT_REFCOUNTED) && *len) {
240 BUG_ON(!(OCFS2_I(inode)->ip_dyn_features &
241 OCFS2_HAS_REFCOUNT_FL));
243 BUG_ON(!context->refcount_loc);
245 ret = ocfs2_lock_refcount_tree(osb, context->refcount_loc, 1,
252 ret = ocfs2_prepare_refcount_change_for_del(inode,
253 context->refcount_loc,
264 ret = ocfs2_lock_allocators_move_extents(inode, &context->et, *len, 1,
267 extra_blocks, &credits);
274 * should be using allocation reservation strategy there?
276 * if (context->data_ac)
277 * context->data_ac->ac_resv = &OCFS2_I(inode)->ip_la_data_resv;
280 mutex_lock(&tl_inode->i_mutex);
282 if (ocfs2_truncate_log_needs_flush(osb)) {
283 ret = __ocfs2_flush_truncate_log(osb);
286 goto out_unlock_mutex;
290 handle = ocfs2_start_trans(osb, credits);
291 if (IS_ERR(handle)) {
292 ret = PTR_ERR(handle);
294 goto out_unlock_mutex;
297 ret = __ocfs2_claim_clusters(handle, context->data_ac, 1, *len,
298 &new_phys_cpos, &new_len);
305 * allowing partial extent moving is kind of 'pros and cons', it makes
306 * whole defragmentation less likely to fail, on the contrary, the bad
307 * thing is it may make the fs even more fragmented after moving, let
308 * userspace make a good decision here.
310 if (new_len != *len) {
311 mlog(0, "len_claimed: %u, len: %u\n", new_len, *len);
313 context->range->me_flags &= ~OCFS2_MOVE_EXT_FL_COMPLETE;
319 mlog(0, "cpos: %u, phys_cpos: %u, new_phys_cpos: %u\n", cpos,
320 phys_cpos, new_phys_cpos);
322 ret = __ocfs2_move_extent(handle, context, cpos, new_len, phys_cpos,
323 new_phys_cpos, ext_flags);
327 if (partial && (new_len != *len))
331 * Here we should write the new page out first if we are
332 * in write-back mode.
334 ret = ocfs2_cow_sync_writeback(inode->i_sb, context->inode, cpos, *len);
339 ocfs2_commit_trans(osb, handle);
342 mutex_unlock(&tl_inode->i_mutex);
344 if (context->data_ac) {
345 ocfs2_free_alloc_context(context->data_ac);
346 context->data_ac = NULL;
349 if (context->meta_ac) {
350 ocfs2_free_alloc_context(context->meta_ac);
351 context->meta_ac = NULL;
356 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
362 * find the victim alloc group, where #blkno fits.
364 static int ocfs2_find_victim_alloc_group(struct inode *inode,
368 struct buffer_head **ret_bh)
370 int ret, i, bits_per_unit = 0;
374 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
375 struct buffer_head *ac_bh = NULL, *gd_bh = NULL;
376 struct ocfs2_chain_list *cl;
377 struct ocfs2_chain_rec *rec;
378 struct ocfs2_dinode *ac_dinode;
379 struct ocfs2_group_desc *bg;
381 ocfs2_sprintf_system_inode_name(namebuf, sizeof(namebuf), type, slot);
382 ret = ocfs2_lookup_ino_from_name(osb->sys_root_inode, namebuf,
383 strlen(namebuf), &blkno);
389 ret = ocfs2_read_blocks_sync(osb, blkno, 1, &ac_bh);
395 ac_dinode = (struct ocfs2_dinode *)ac_bh->b_data;
396 cl = &(ac_dinode->id2.i_chain);
397 rec = &(cl->cl_recs[0]);
399 if (type == GLOBAL_BITMAP_SYSTEM_INODE)
400 bits_per_unit = osb->s_clustersize_bits -
401 inode->i_sb->s_blocksize_bits;
403 * 'vict_blkno' was out of the valid range.
405 if ((vict_blkno < le64_to_cpu(rec->c_blkno)) ||
406 (vict_blkno >= (le32_to_cpu(ac_dinode->id1.bitmap1.i_total) <<
412 for (i = 0; i < le16_to_cpu(cl->cl_next_free_rec); i++) {
414 rec = &(cl->cl_recs[i]);
422 blkno = le64_to_cpu(rec->c_blkno);
424 blkno = le64_to_cpu(bg->bg_next_group);
431 ret = ocfs2_read_blocks_sync(osb, blkno, 1, &gd_bh);
437 bg = (struct ocfs2_group_desc *)gd_bh->b_data;
439 if (vict_blkno < (le64_to_cpu(bg->bg_blkno) +
440 le16_to_cpu(bg->bg_bits))) {
443 *vict_bit = (vict_blkno - blkno) >>
445 mlog(0, "find the victim group: #%llu, "
446 "total_bits: %u, vict_bit: %u\n",
447 blkno, le16_to_cpu(bg->bg_bits),
452 } while (le64_to_cpu(bg->bg_next_group));
460 * caller has to release the gd_bh properly.
466 * XXX: helper to validate and adjust moving goal.
468 static int ocfs2_validate_and_adjust_move_goal(struct inode *inode,
469 struct ocfs2_move_extents *range)
471 int ret, goal_bit = 0;
473 struct buffer_head *gd_bh = NULL;
474 struct ocfs2_group_desc *bg;
475 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
476 int c_to_b = 1 << (osb->s_clustersize_bits -
477 inode->i_sb->s_blocksize_bits);
480 * make goal become cluster aligned.
482 range->me_goal = ocfs2_block_to_cluster_start(inode->i_sb,
485 * validate goal sits within global_bitmap, and return the victim
488 ret = ocfs2_find_victim_alloc_group(inode, range->me_goal,
489 GLOBAL_BITMAP_SYSTEM_INODE,
495 bg = (struct ocfs2_group_desc *)gd_bh->b_data;
498 * moving goal is not allowd to start with a group desc blok(#0 blk)
499 * let's compromise to the latter cluster.
501 if (range->me_goal == le64_to_cpu(bg->bg_blkno))
502 range->me_goal += c_to_b;
505 * movement is not gonna cross two groups.
507 if ((le16_to_cpu(bg->bg_bits) - goal_bit) * osb->s_clustersize <
513 * more exact validations/adjustments will be performed later during
514 * moving operation for each extent range.
516 mlog(0, "extents get ready to be moved to #%llu block\n",
525 static void ocfs2_probe_alloc_group(struct inode *inode, struct buffer_head *bh,
526 int *goal_bit, u32 move_len, u32 max_hop,
529 int i, used, last_free_bits = 0, base_bit = *goal_bit;
530 struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data;
531 u32 base_cpos = ocfs2_blocks_to_clusters(inode->i_sb,
532 le64_to_cpu(gd->bg_blkno));
534 for (i = base_bit; i < le16_to_cpu(gd->bg_bits); i++) {
536 used = ocfs2_test_bit(i, (unsigned long *)gd->bg_bitmap);
539 * we even tried searching the free chunk by jumping
540 * a 'max_hop' distance, but still failed.
542 if ((i - base_bit) > max_hop) {
554 if (last_free_bits == move_len) {
556 *phys_cpos = base_cpos + i;
561 mlog(0, "found phys_cpos: %u to fit the wanted moving.\n", *phys_cpos);
564 static int ocfs2_move_extent(struct ocfs2_move_extents_context *context,
565 u32 cpos, u32 phys_cpos, u32 *new_phys_cpos,
566 u32 len, int ext_flags)
568 int ret, credits = 0, extra_blocks = 0, goal_bit = 0;
570 struct inode *inode = context->inode;
571 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
572 struct inode *tl_inode = osb->osb_tl_inode;
573 struct inode *gb_inode = NULL;
574 struct buffer_head *gb_bh = NULL;
575 struct buffer_head *gd_bh = NULL;
576 struct ocfs2_group_desc *gd;
577 struct ocfs2_refcount_tree *ref_tree = NULL;
578 u32 move_max_hop = ocfs2_blocks_to_clusters(inode->i_sb,
579 context->range->me_threshold);
580 u64 phys_blkno, new_phys_blkno;
582 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
584 if ((ext_flags & OCFS2_EXT_REFCOUNTED) && len) {
586 BUG_ON(!(OCFS2_I(inode)->ip_dyn_features &
587 OCFS2_HAS_REFCOUNT_FL));
589 BUG_ON(!context->refcount_loc);
591 ret = ocfs2_lock_refcount_tree(osb, context->refcount_loc, 1,
598 ret = ocfs2_prepare_refcount_change_for_del(inode,
599 context->refcount_loc,
610 ret = ocfs2_lock_allocators_move_extents(inode, &context->et, len, 1,
612 NULL, extra_blocks, &credits);
619 * need to count 2 extra credits for global_bitmap inode and
622 credits += OCFS2_INODE_UPDATE_CREDITS + 1;
625 * ocfs2_move_extent() didn't reserve any clusters in lock_allocators()
626 * logic, while we still need to lock the global_bitmap.
628 gb_inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE,
631 mlog(ML_ERROR, "unable to get global_bitmap inode\n");
636 mutex_lock(&gb_inode->i_mutex);
638 ret = ocfs2_inode_lock(gb_inode, &gb_bh, 1);
641 goto out_unlock_gb_mutex;
644 mutex_lock(&tl_inode->i_mutex);
646 handle = ocfs2_start_trans(osb, credits);
647 if (IS_ERR(handle)) {
648 ret = PTR_ERR(handle);
650 goto out_unlock_tl_inode;
653 new_phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, *new_phys_cpos);
654 ret = ocfs2_find_victim_alloc_group(inode, new_phys_blkno,
655 GLOBAL_BITMAP_SYSTEM_INODE,
664 * probe the victim cluster group to find a proper
665 * region to fit wanted movement, it even will perfrom
666 * a best-effort attempt by compromising to a threshold
669 ocfs2_probe_alloc_group(inode, gd_bh, &goal_bit, len, move_max_hop,
671 if (!*new_phys_cpos) {
676 ret = __ocfs2_move_extent(handle, context, cpos, len, phys_cpos,
677 *new_phys_cpos, ext_flags);
683 gd = (struct ocfs2_group_desc *)gd_bh->b_data;
684 ret = ocfs2_alloc_dinode_update_counts(gb_inode, handle, gb_bh, len,
685 le16_to_cpu(gd->bg_chain));
691 ret = ocfs2_block_group_set_bits(handle, gb_inode, gd, gd_bh,
697 * Here we should write the new page out first if we are
698 * in write-back mode.
700 ret = ocfs2_cow_sync_writeback(inode->i_sb, context->inode, cpos, len);
705 ocfs2_commit_trans(osb, handle);
709 mutex_unlock(&tl_inode->i_mutex);
711 ocfs2_inode_unlock(gb_inode, 1);
713 mutex_unlock(&gb_inode->i_mutex);
718 if (context->meta_ac) {
719 ocfs2_free_alloc_context(context->meta_ac);
720 context->meta_ac = NULL;
724 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
730 * Helper to calculate the defraging length in one run according to threshold.
732 static void ocfs2_calc_extent_defrag_len(u32 *alloc_size, u32 *len_defraged,
733 u32 threshold, int *skip)
735 if ((*alloc_size + *len_defraged) < threshold) {
737 * proceed defragmentation until we meet the thresh
739 *len_defraged += *alloc_size;
740 } else if (*len_defraged == 0) {
742 * XXX: skip a large extent.
747 * split this extent to coalesce with former pieces as
748 * to reach the threshold.
750 * we're done here with one cycle of defragmentation
751 * in a size of 'thresh', resetting 'len_defraged'
752 * forces a new defragmentation.
754 *alloc_size = threshold - *len_defraged;
759 static int __ocfs2_move_extents_range(struct buffer_head *di_bh,
760 struct ocfs2_move_extents_context *context)
762 int ret = 0, flags, do_defrag, skip = 0;
763 u32 cpos, phys_cpos, move_start, len_to_move, alloc_size;
764 u32 len_defraged = 0, defrag_thresh = 0, new_phys_cpos = 0;
766 struct inode *inode = context->inode;
767 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
768 struct ocfs2_move_extents *range = context->range;
769 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
771 if ((i_size_read(inode) == 0) || (range->me_len == 0))
774 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
777 context->refcount_loc = le64_to_cpu(di->i_refcount_loc);
779 ocfs2_init_dinode_extent_tree(&context->et, INODE_CACHE(inode), di_bh);
780 ocfs2_init_dealloc_ctxt(&context->dealloc);
788 do_defrag = context->auto_defrag;
791 * extents moving happens in unit of clusters, for the sake
792 * of simplicity, we may ignore two clusters where 'byte_start'
793 * and 'byte_start + len' were within.
795 move_start = ocfs2_clusters_for_bytes(osb->sb, range->me_start);
796 len_to_move = (range->me_start + range->me_len) >>
797 osb->s_clustersize_bits;
798 if (len_to_move >= move_start)
799 len_to_move -= move_start;
804 defrag_thresh = range->me_threshold >> osb->s_clustersize_bits;
805 if (defrag_thresh <= 1)
808 new_phys_cpos = ocfs2_blocks_to_clusters(inode->i_sb,
811 mlog(0, "Inode: %llu, start: %llu, len: %llu, cstart: %u, clen: %u, "
813 (unsigned long long)OCFS2_I(inode)->ip_blkno,
814 (unsigned long long)range->me_start,
815 (unsigned long long)range->me_len,
816 move_start, len_to_move, defrag_thresh);
819 while (len_to_move) {
820 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &alloc_size,
827 if (alloc_size > len_to_move)
828 alloc_size = len_to_move;
831 * XXX: how to deal with a hole:
833 * - skip the hole of course
834 * - force a new defragmentation
844 ocfs2_calc_extent_defrag_len(&alloc_size, &len_defraged,
845 defrag_thresh, &skip);
854 mlog(0, "#Defrag: cpos: %u, phys_cpos: %u, "
855 "alloc_size: %u, len_defraged: %u\n",
856 cpos, phys_cpos, alloc_size, len_defraged);
858 ret = ocfs2_defrag_extent(context, cpos, phys_cpos,
861 ret = ocfs2_move_extent(context, cpos, phys_cpos,
862 &new_phys_cpos, alloc_size,
865 new_phys_cpos += alloc_size;
873 context->clusters_moved += alloc_size;
876 len_to_move -= alloc_size;
880 range->me_flags |= OCFS2_MOVE_EXT_FL_COMPLETE;
883 range->me_moved_len = ocfs2_clusters_to_bytes(osb->sb,
884 context->clusters_moved);
885 range->me_new_offset = ocfs2_clusters_to_bytes(osb->sb,
886 context->new_phys_cpos);
888 ocfs2_schedule_truncate_log_flush(osb, 1);
889 ocfs2_run_deallocs(osb, &context->dealloc);
894 static int ocfs2_move_extents(struct ocfs2_move_extents_context *context)
898 struct inode *inode = context->inode;
899 struct ocfs2_dinode *di;
900 struct buffer_head *di_bh = NULL;
901 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
906 if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
909 mutex_lock(&inode->i_mutex);
912 * This prevents concurrent writes from other nodes
914 status = ocfs2_rw_lock(inode, 1);
920 status = ocfs2_inode_lock(inode, &di_bh, 1);
927 * rememer ip_xattr_sem also needs to be held if necessary
929 down_write(&OCFS2_I(inode)->ip_alloc_sem);
931 status = __ocfs2_move_extents_range(di_bh, context);
933 up_write(&OCFS2_I(inode)->ip_alloc_sem);
936 goto out_inode_unlock;
940 * We update ctime for these changes
942 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
943 if (IS_ERR(handle)) {
944 status = PTR_ERR(handle);
946 goto out_inode_unlock;
949 status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
950 OCFS2_JOURNAL_ACCESS_WRITE);
956 di = (struct ocfs2_dinode *)di_bh->b_data;
957 inode->i_ctime = CURRENT_TIME;
958 di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
959 di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
961 ocfs2_journal_dirty(handle, di_bh);
964 ocfs2_commit_trans(osb, handle);
968 ocfs2_inode_unlock(inode, 1);
970 ocfs2_rw_unlock(inode, 1);
972 mutex_unlock(&inode->i_mutex);
977 int ocfs2_ioctl_move_extents(struct file *filp, void __user *argp)
981 struct inode *inode = file_inode(filp);
982 struct ocfs2_move_extents range;
983 struct ocfs2_move_extents_context *context;
988 status = mnt_want_write_file(filp);
992 if ((!S_ISREG(inode->i_mode)) || !(filp->f_mode & FMODE_WRITE)) {
997 if (inode->i_flags & (S_IMMUTABLE|S_APPEND)) {
1002 context = kzalloc(sizeof(struct ocfs2_move_extents_context), GFP_NOFS);
1009 context->inode = inode;
1010 context->file = filp;
1012 if (copy_from_user(&range, argp, sizeof(range))) {
1017 if (range.me_start > i_size_read(inode)) {
1022 if (range.me_start + range.me_len > i_size_read(inode))
1023 range.me_len = i_size_read(inode) - range.me_start;
1025 context->range = ⦥
1027 if (range.me_flags & OCFS2_MOVE_EXT_FL_AUTO_DEFRAG) {
1028 context->auto_defrag = 1;
1030 * ok, the default theshold for the defragmentation
1031 * is 1M, since our maximum clustersize was 1M also.
1034 if (!range.me_threshold)
1035 range.me_threshold = 1024 * 1024;
1037 if (range.me_threshold > i_size_read(inode))
1038 range.me_threshold = i_size_read(inode);
1040 if (range.me_flags & OCFS2_MOVE_EXT_FL_PART_DEFRAG)
1041 context->partial = 1;
1044 * first best-effort attempt to validate and adjust the goal
1045 * (physical address in block), while it can't guarantee later
1046 * operation can succeed all the time since global_bitmap may
1047 * change a bit over time.
1050 status = ocfs2_validate_and_adjust_move_goal(inode, &range);
1055 status = ocfs2_move_extents(context);
1060 * movement/defragmentation may end up being partially completed,
1061 * that's the reason why we need to return userspace the finished
1062 * length and new_offset even if failure happens somewhere.
1064 if (copy_to_user(argp, &range, sizeof(range)))
1070 mnt_drop_write_file(filp);