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"
28 #include "localalloc.h"
31 #include "extent_map.h"
38 #include "buffer_head_io.h"
40 #include "refcounttree.h"
41 #include "move_extents.h"
43 struct ocfs2_move_extents_context {
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;
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,
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);
73 ret = ocfs2_duplicate_clusters_by_page(handle, inode, cpos,
74 p_cpos, new_p_cpos, len);
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,
86 path = ocfs2_new_path_from_et(&context->et);
93 ret = ocfs2_find_path(INODE_CACHE(inode), path, cpos);
99 el = path_leaf_el(path);
101 index = ocfs2_search_extent_list(el, cpos);
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);
109 rec = &el->l_recs[index];
111 BUG_ON(ext_flags != rec->e_flags);
113 * after moving/defraging to new location, the extent is not going
114 * to be refcounted anymore.
116 replace_rec.e_flags = ext_flags & ~OCFS2_EXT_REFCOUNTED;
118 ret = ocfs2_split_extent(handle, &context->et, path, index,
119 &replace_rec, context->meta_ac,
126 context->new_phys_cpos = new_p_cpos;
129 * need I to append truncate log for old clusters?
132 if (ext_flags & OCFS2_EXT_REFCOUNTED)
133 ret = ocfs2_decrease_refcount(inode, handle,
134 ocfs2_blocks_to_clusters(osb->sb,
136 len, context->meta_ac,
137 &context->dealloc, 1);
139 ret = ocfs2_truncate_log_append(osb, handle,
143 ocfs2_update_inode_fsync_trans(handle, inode, 0);
145 ocfs2_free_path(path);
150 * lock allocator, and reserve appropriate number of bits for
153 static int ocfs2_lock_meta_allocator_move_extents(struct inode *inode,
154 struct ocfs2_extent_tree *et,
155 u32 clusters_to_move,
156 u32 extents_to_split,
157 struct ocfs2_alloc_context **meta_ac,
161 int ret, num_free_extents;
162 unsigned int max_recs_needed = 2 * extents_to_split + clusters_to_move;
163 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
165 num_free_extents = ocfs2_num_free_extents(et);
166 if (num_free_extents < 0) {
167 ret = num_free_extents;
172 if (!num_free_extents ||
173 (ocfs2_sparse_alloc(osb) && num_free_extents < max_recs_needed))
174 extra_blocks += ocfs2_extend_meta_needed(et->et_root_el);
176 ret = ocfs2_reserve_new_metadata_blocks(osb, extra_blocks, meta_ac);
183 *credits += ocfs2_calc_extend_credits(osb->sb, et->et_root_el);
185 mlog(0, "reserve metadata_blocks: %d, data_clusters: %u, credits: %d\n",
186 extra_blocks, clusters_to_move, *credits);
190 ocfs2_free_alloc_context(*meta_ac);
199 * Using one journal handle to guarantee the data consistency in case
200 * crash happens anywhere.
202 * XXX: defrag can end up with finishing partial extent as requested,
203 * due to not enough contiguous clusters can be found in allocator.
205 static int ocfs2_defrag_extent(struct ocfs2_move_extents_context *context,
206 u32 cpos, u32 phys_cpos, u32 *len, int ext_flags)
208 int ret, credits = 0, extra_blocks = 0, partial = context->partial;
210 struct inode *inode = context->inode;
211 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
212 struct inode *tl_inode = osb->osb_tl_inode;
213 struct ocfs2_refcount_tree *ref_tree = NULL;
214 u32 new_phys_cpos, new_len;
215 u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
218 if ((ext_flags & OCFS2_EXT_REFCOUNTED) && *len) {
219 BUG_ON(!ocfs2_is_refcount_inode(inode));
220 BUG_ON(!context->refcount_loc);
222 ret = ocfs2_lock_refcount_tree(osb, context->refcount_loc, 1,
229 ret = ocfs2_prepare_refcount_change_for_del(inode,
230 context->refcount_loc,
241 ret = ocfs2_lock_meta_allocator_move_extents(inode, &context->et,
244 extra_blocks, &credits);
251 * should be using allocation reservation strategy there?
253 * if (context->data_ac)
254 * context->data_ac->ac_resv = &OCFS2_I(inode)->ip_la_data_resv;
257 inode_lock(tl_inode);
259 if (ocfs2_truncate_log_needs_flush(osb)) {
260 ret = __ocfs2_flush_truncate_log(osb);
263 goto out_unlock_mutex;
268 * Make sure ocfs2_reserve_cluster is called after
269 * __ocfs2_flush_truncate_log, otherwise, dead lock may happen.
271 * If ocfs2_reserve_cluster is called
272 * before __ocfs2_flush_truncate_log, dead lock on global bitmap
276 ret = ocfs2_reserve_clusters(osb, *len, &context->data_ac);
279 goto out_unlock_mutex;
282 handle = ocfs2_start_trans(osb, credits);
283 if (IS_ERR(handle)) {
284 ret = PTR_ERR(handle);
286 goto out_unlock_mutex;
289 ret = __ocfs2_claim_clusters(handle, context->data_ac, 1, *len,
290 &new_phys_cpos, &new_len);
297 * allowing partial extent moving is kind of 'pros and cons', it makes
298 * whole defragmentation less likely to fail, on the contrary, the bad
299 * thing is it may make the fs even more fragmented after moving, let
300 * userspace make a good decision here.
302 if (new_len != *len) {
303 mlog(0, "len_claimed: %u, len: %u\n", new_len, *len);
305 context->range->me_flags &= ~OCFS2_MOVE_EXT_FL_COMPLETE;
312 mlog(0, "cpos: %u, phys_cpos: %u, new_phys_cpos: %u\n", cpos,
313 phys_cpos, new_phys_cpos);
315 ret = __ocfs2_move_extent(handle, context, cpos, new_len, phys_cpos,
316 new_phys_cpos, ext_flags);
320 if (partial && (new_len != *len))
324 * Here we should write the new page out first if we are
325 * in write-back mode.
327 ret = ocfs2_cow_sync_writeback(inode->i_sb, context->inode, cpos, *len);
332 if (need_free && context->data_ac) {
333 struct ocfs2_alloc_context *data_ac = context->data_ac;
335 if (context->data_ac->ac_which == OCFS2_AC_USE_LOCAL)
336 ocfs2_free_local_alloc_bits(osb, handle, data_ac,
337 new_phys_cpos, new_len);
339 ocfs2_free_clusters(handle,
342 ocfs2_clusters_to_blocks(osb->sb, new_phys_cpos),
346 ocfs2_commit_trans(osb, handle);
349 inode_unlock(tl_inode);
351 if (context->data_ac) {
352 ocfs2_free_alloc_context(context->data_ac);
353 context->data_ac = NULL;
356 if (context->meta_ac) {
357 ocfs2_free_alloc_context(context->meta_ac);
358 context->meta_ac = NULL;
363 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
369 * find the victim alloc group, where #blkno fits.
371 static int ocfs2_find_victim_alloc_group(struct inode *inode,
375 struct buffer_head **ret_bh)
377 int ret, i, bits_per_unit = 0;
381 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
382 struct buffer_head *ac_bh = NULL, *gd_bh = NULL;
383 struct ocfs2_chain_list *cl;
384 struct ocfs2_chain_rec *rec;
385 struct ocfs2_dinode *ac_dinode;
386 struct ocfs2_group_desc *bg;
388 ocfs2_sprintf_system_inode_name(namebuf, sizeof(namebuf), type, slot);
389 ret = ocfs2_lookup_ino_from_name(osb->sys_root_inode, namebuf,
390 strlen(namebuf), &blkno);
396 ret = ocfs2_read_blocks_sync(osb, blkno, 1, &ac_bh);
402 ac_dinode = (struct ocfs2_dinode *)ac_bh->b_data;
403 cl = &(ac_dinode->id2.i_chain);
404 rec = &(cl->cl_recs[0]);
406 if (type == GLOBAL_BITMAP_SYSTEM_INODE)
407 bits_per_unit = osb->s_clustersize_bits -
408 inode->i_sb->s_blocksize_bits;
410 * 'vict_blkno' was out of the valid range.
412 if ((vict_blkno < le64_to_cpu(rec->c_blkno)) ||
413 (vict_blkno >= ((u64)le32_to_cpu(ac_dinode->id1.bitmap1.i_total) <<
419 for (i = 0; i < le16_to_cpu(cl->cl_next_free_rec); i++) {
421 rec = &(cl->cl_recs[i]);
429 blkno = le64_to_cpu(rec->c_blkno);
431 blkno = le64_to_cpu(bg->bg_next_group);
438 ret = ocfs2_read_blocks_sync(osb, blkno, 1, &gd_bh);
444 bg = (struct ocfs2_group_desc *)gd_bh->b_data;
446 if (vict_blkno < (le64_to_cpu(bg->bg_blkno) +
447 (le16_to_cpu(bg->bg_bits) << bits_per_unit))) {
450 *vict_bit = (vict_blkno - blkno) >>
452 mlog(0, "find the victim group: #%llu, "
453 "total_bits: %u, vict_bit: %u\n",
454 blkno, le16_to_cpu(bg->bg_bits),
459 } while (le64_to_cpu(bg->bg_next_group));
467 * caller has to release the gd_bh properly.
473 * XXX: helper to validate and adjust moving goal.
475 static int ocfs2_validate_and_adjust_move_goal(struct inode *inode,
476 struct ocfs2_move_extents *range)
478 int ret, goal_bit = 0;
480 struct buffer_head *gd_bh = NULL;
481 struct ocfs2_group_desc *bg;
482 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
483 int c_to_b = 1 << (osb->s_clustersize_bits -
484 inode->i_sb->s_blocksize_bits);
487 * make goal become cluster aligned.
489 range->me_goal = ocfs2_block_to_cluster_start(inode->i_sb,
492 * validate goal sits within global_bitmap, and return the victim
495 ret = ocfs2_find_victim_alloc_group(inode, range->me_goal,
496 GLOBAL_BITMAP_SYSTEM_INODE,
502 bg = (struct ocfs2_group_desc *)gd_bh->b_data;
505 * moving goal is not allowd to start with a group desc blok(#0 blk)
506 * let's compromise to the latter cluster.
508 if (range->me_goal == le64_to_cpu(bg->bg_blkno))
509 range->me_goal += c_to_b;
512 * movement is not gonna cross two groups.
514 if ((le16_to_cpu(bg->bg_bits) - goal_bit) * osb->s_clustersize <
520 * more exact validations/adjustments will be performed later during
521 * moving operation for each extent range.
523 mlog(0, "extents get ready to be moved to #%llu block\n",
532 static void ocfs2_probe_alloc_group(struct inode *inode, struct buffer_head *bh,
533 int *goal_bit, u32 move_len, u32 max_hop,
536 int i, used, last_free_bits = 0, base_bit = *goal_bit;
537 struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data;
538 u32 base_cpos = ocfs2_blocks_to_clusters(inode->i_sb,
539 le64_to_cpu(gd->bg_blkno));
541 for (i = base_bit; i < le16_to_cpu(gd->bg_bits); i++) {
543 used = ocfs2_test_bit(i, (unsigned long *)gd->bg_bitmap);
546 * we even tried searching the free chunk by jumping
547 * a 'max_hop' distance, but still failed.
549 if ((i - base_bit) > max_hop) {
561 if (last_free_bits == move_len) {
564 *phys_cpos = base_cpos + i;
569 mlog(0, "found phys_cpos: %u to fit the wanted moving.\n", *phys_cpos);
572 static int ocfs2_move_extent(struct ocfs2_move_extents_context *context,
573 u32 cpos, u32 phys_cpos, u32 *new_phys_cpos,
574 u32 len, int ext_flags)
576 int ret, credits = 0, extra_blocks = 0, goal_bit = 0;
578 struct inode *inode = context->inode;
579 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
580 struct inode *tl_inode = osb->osb_tl_inode;
581 struct inode *gb_inode = NULL;
582 struct buffer_head *gb_bh = NULL;
583 struct buffer_head *gd_bh = NULL;
584 struct ocfs2_group_desc *gd;
585 struct ocfs2_refcount_tree *ref_tree = NULL;
586 u32 move_max_hop = ocfs2_blocks_to_clusters(inode->i_sb,
587 context->range->me_threshold);
588 u64 phys_blkno, new_phys_blkno;
590 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
592 if ((ext_flags & OCFS2_EXT_REFCOUNTED) && len) {
593 BUG_ON(!ocfs2_is_refcount_inode(inode));
594 BUG_ON(!context->refcount_loc);
596 ret = ocfs2_lock_refcount_tree(osb, context->refcount_loc, 1,
603 ret = ocfs2_prepare_refcount_change_for_del(inode,
604 context->refcount_loc,
615 ret = ocfs2_lock_meta_allocator_move_extents(inode, &context->et,
618 extra_blocks, &credits);
625 * need to count 2 extra credits for global_bitmap inode and
628 credits += OCFS2_INODE_UPDATE_CREDITS + 1;
631 * ocfs2_move_extent() didn't reserve any clusters in lock_allocators()
632 * logic, while we still need to lock the global_bitmap.
634 gb_inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE,
637 mlog(ML_ERROR, "unable to get global_bitmap inode\n");
642 inode_lock(gb_inode);
644 ret = ocfs2_inode_lock(gb_inode, &gb_bh, 1);
647 goto out_unlock_gb_mutex;
650 inode_lock(tl_inode);
652 handle = ocfs2_start_trans(osb, credits);
653 if (IS_ERR(handle)) {
654 ret = PTR_ERR(handle);
656 goto out_unlock_tl_inode;
659 new_phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, *new_phys_cpos);
660 ret = ocfs2_find_victim_alloc_group(inode, new_phys_blkno,
661 GLOBAL_BITMAP_SYSTEM_INODE,
670 * probe the victim cluster group to find a proper
671 * region to fit wanted movement, it even will perfrom
672 * a best-effort attempt by compromising to a threshold
675 ocfs2_probe_alloc_group(inode, gd_bh, &goal_bit, len, move_max_hop,
677 if (!*new_phys_cpos) {
682 ret = __ocfs2_move_extent(handle, context, cpos, len, phys_cpos,
683 *new_phys_cpos, ext_flags);
689 gd = (struct ocfs2_group_desc *)gd_bh->b_data;
690 ret = ocfs2_alloc_dinode_update_counts(gb_inode, handle, gb_bh, len,
691 le16_to_cpu(gd->bg_chain));
697 ret = ocfs2_block_group_set_bits(handle, gb_inode, gd, gd_bh,
700 ocfs2_rollback_alloc_dinode_counts(gb_inode, gb_bh, len,
701 le16_to_cpu(gd->bg_chain));
706 * Here we should write the new page out first if we are
707 * in write-back mode.
709 ret = ocfs2_cow_sync_writeback(inode->i_sb, context->inode, cpos, len);
714 ocfs2_commit_trans(osb, handle);
718 inode_unlock(tl_inode);
720 ocfs2_inode_unlock(gb_inode, 1);
722 inode_unlock(gb_inode);
727 if (context->meta_ac) {
728 ocfs2_free_alloc_context(context->meta_ac);
729 context->meta_ac = NULL;
733 ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
739 * Helper to calculate the defraging length in one run according to threshold.
741 static void ocfs2_calc_extent_defrag_len(u32 *alloc_size, u32 *len_defraged,
742 u32 threshold, int *skip)
744 if ((*alloc_size + *len_defraged) < threshold) {
746 * proceed defragmentation until we meet the thresh
748 *len_defraged += *alloc_size;
749 } else if (*len_defraged == 0) {
751 * XXX: skip a large extent.
756 * split this extent to coalesce with former pieces as
757 * to reach the threshold.
759 * we're done here with one cycle of defragmentation
760 * in a size of 'thresh', resetting 'len_defraged'
761 * forces a new defragmentation.
763 *alloc_size = threshold - *len_defraged;
768 static int __ocfs2_move_extents_range(struct buffer_head *di_bh,
769 struct ocfs2_move_extents_context *context)
771 int ret = 0, flags, do_defrag, skip = 0;
772 u32 cpos, phys_cpos, move_start, len_to_move, alloc_size;
773 u32 len_defraged = 0, defrag_thresh = 0, new_phys_cpos = 0;
775 struct inode *inode = context->inode;
776 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
777 struct ocfs2_move_extents *range = context->range;
778 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
780 if ((i_size_read(inode) == 0) || (range->me_len == 0))
783 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
786 context->refcount_loc = le64_to_cpu(di->i_refcount_loc);
788 ocfs2_init_dinode_extent_tree(&context->et, INODE_CACHE(inode), di_bh);
789 ocfs2_init_dealloc_ctxt(&context->dealloc);
797 do_defrag = context->auto_defrag;
800 * extents moving happens in unit of clusters, for the sake
801 * of simplicity, we may ignore two clusters where 'byte_start'
802 * and 'byte_start + len' were within.
804 move_start = ocfs2_clusters_for_bytes(osb->sb, range->me_start);
805 len_to_move = (range->me_start + range->me_len) >>
806 osb->s_clustersize_bits;
807 if (len_to_move >= move_start)
808 len_to_move -= move_start;
813 defrag_thresh = range->me_threshold >> osb->s_clustersize_bits;
814 if (defrag_thresh <= 1)
817 new_phys_cpos = ocfs2_blocks_to_clusters(inode->i_sb,
820 mlog(0, "Inode: %llu, start: %llu, len: %llu, cstart: %u, clen: %u, "
822 (unsigned long long)OCFS2_I(inode)->ip_blkno,
823 (unsigned long long)range->me_start,
824 (unsigned long long)range->me_len,
825 move_start, len_to_move, defrag_thresh);
828 while (len_to_move) {
829 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &alloc_size,
836 if (alloc_size > len_to_move)
837 alloc_size = len_to_move;
840 * XXX: how to deal with a hole:
842 * - skip the hole of course
843 * - force a new defragmentation
853 ocfs2_calc_extent_defrag_len(&alloc_size, &len_defraged,
854 defrag_thresh, &skip);
863 mlog(0, "#Defrag: cpos: %u, phys_cpos: %u, "
864 "alloc_size: %u, len_defraged: %u\n",
865 cpos, phys_cpos, alloc_size, len_defraged);
867 ret = ocfs2_defrag_extent(context, cpos, phys_cpos,
870 ret = ocfs2_move_extent(context, cpos, phys_cpos,
871 &new_phys_cpos, alloc_size,
874 new_phys_cpos += alloc_size;
882 context->clusters_moved += alloc_size;
885 len_to_move -= alloc_size;
889 range->me_flags |= OCFS2_MOVE_EXT_FL_COMPLETE;
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);
897 ocfs2_schedule_truncate_log_flush(osb, 1);
898 ocfs2_run_deallocs(osb, &context->dealloc);
903 static int ocfs2_move_extents(struct ocfs2_move_extents_context *context)
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);
912 if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
918 * This prevents concurrent writes from other nodes
920 status = ocfs2_rw_lock(inode, 1);
926 status = ocfs2_inode_lock(inode, &di_bh, 1);
933 * rememer ip_xattr_sem also needs to be held if necessary
935 down_write(&OCFS2_I(inode)->ip_alloc_sem);
937 status = __ocfs2_move_extents_range(di_bh, context);
939 up_write(&OCFS2_I(inode)->ip_alloc_sem);
942 goto out_inode_unlock;
946 * We update ctime for these changes
948 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
949 if (IS_ERR(handle)) {
950 status = PTR_ERR(handle);
952 goto out_inode_unlock;
955 status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
956 OCFS2_JOURNAL_ACCESS_WRITE);
962 di = (struct ocfs2_dinode *)di_bh->b_data;
963 inode->i_ctime = current_time(inode);
964 di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
965 di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
966 ocfs2_update_inode_fsync_trans(handle, inode, 0);
968 ocfs2_journal_dirty(handle, di_bh);
971 ocfs2_commit_trans(osb, handle);
975 ocfs2_inode_unlock(inode, 1);
977 ocfs2_rw_unlock(inode, 1);
984 int ocfs2_ioctl_move_extents(struct file *filp, void __user *argp)
988 struct inode *inode = file_inode(filp);
989 struct ocfs2_move_extents range;
990 struct ocfs2_move_extents_context *context;
995 status = mnt_want_write_file(filp);
999 if ((!S_ISREG(inode->i_mode)) || !(filp->f_mode & FMODE_WRITE)) {
1004 if (inode->i_flags & (S_IMMUTABLE|S_APPEND)) {
1009 context = kzalloc(sizeof(struct ocfs2_move_extents_context), GFP_NOFS);
1016 context->inode = inode;
1017 context->file = filp;
1019 if (copy_from_user(&range, argp, sizeof(range))) {
1024 if (range.me_start > i_size_read(inode)) {
1029 if (range.me_start + range.me_len > i_size_read(inode))
1030 range.me_len = i_size_read(inode) - range.me_start;
1032 context->range = ⦥
1035 * ok, the default theshold for the defragmentation
1036 * is 1M, since our maximum clustersize was 1M also.
1039 if (!range.me_threshold)
1040 range.me_threshold = 1024 * 1024;
1042 if (range.me_threshold > i_size_read(inode))
1043 range.me_threshold = i_size_read(inode);
1045 if (range.me_flags & OCFS2_MOVE_EXT_FL_AUTO_DEFRAG) {
1046 context->auto_defrag = 1;
1048 if (range.me_flags & OCFS2_MOVE_EXT_FL_PART_DEFRAG)
1049 context->partial = 1;
1052 * first best-effort attempt to validate and adjust the goal
1053 * (physical address in block), while it can't guarantee later
1054 * operation can succeed all the time since global_bitmap may
1055 * change a bit over time.
1058 status = ocfs2_validate_and_adjust_move_goal(inode, &range);
1063 status = ocfs2_move_extents(context);
1068 * movement/defragmentation may end up being partially completed,
1069 * that's the reason why we need to return userspace the finished
1070 * length and new_offset even if failure happens somewhere.
1072 if (copy_to_user(argp, &range, sizeof(range)))
1078 mnt_drop_write_file(filp);