/* -*- mode: c; c-basic-offset: 8; -*- * vim: noexpandtab sw=8 ts=8 sts=0: * * move_extents.c * * Copyright (C) 2011 Oracle. All rights reserved. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public * License version 2 as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. */ #include <linux/fs.h> #include <linux/types.h> #include <linux/mount.h> #include <linux/swap.h> #include <cluster/masklog.h> #include "ocfs2.h" #include "ocfs2_ioctl.h" #include "alloc.h" #include "aops.h" #include "dlmglue.h" #include "extent_map.h" #include "inode.h" #include "journal.h" #include "suballoc.h" #include "uptodate.h" #include "super.h" #include "dir.h" #include "buffer_head_io.h" #include "sysfile.h" #include "refcounttree.h" #include "move_extents.h" struct ocfs2_move_extents_context { struct inode *inode; struct file *file; int auto_defrag; int partial; int credits; u32 new_phys_cpos; u32 clusters_moved; u64 refcount_loc; struct ocfs2_move_extents *range; struct ocfs2_extent_tree et; struct ocfs2_alloc_context *meta_ac; struct ocfs2_alloc_context *data_ac; struct ocfs2_cached_dealloc_ctxt dealloc; }; static int __ocfs2_move_extent(handle_t *handle, struct ocfs2_move_extents_context *context, u32 cpos, u32 len, u32 p_cpos, u32 new_p_cpos, int ext_flags) { int ret = 0, index; struct inode *inode = context->inode; struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); struct ocfs2_extent_rec *rec, replace_rec; struct ocfs2_path *path = NULL; struct ocfs2_extent_list *el; u64 ino = ocfs2_metadata_cache_owner(context->et.et_ci); u64 old_blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cpos); ret = ocfs2_duplicate_clusters_by_page(handle, context->file, cpos, p_cpos, new_p_cpos, len); if (ret) { mlog_errno(ret); goto out; } memset(&replace_rec, 0, sizeof(replace_rec)); replace_rec.e_cpos = cpu_to_le32(cpos); replace_rec.e_leaf_clusters = cpu_to_le16(len); replace_rec.e_blkno = cpu_to_le64(ocfs2_clusters_to_blocks(inode->i_sb, new_p_cpos)); path = ocfs2_new_path_from_et(&context->et); if (!path) { ret = -ENOMEM; mlog_errno(ret); goto out; } ret = ocfs2_find_path(INODE_CACHE(inode), path, cpos); if (ret) { mlog_errno(ret); goto out; } el = path_leaf_el(path); index = ocfs2_search_extent_list(el, cpos); if (index == -1 || index >= le16_to_cpu(el->l_next_free_rec)) { ocfs2_error(inode->i_sb, "Inode %llu has an extent at cpos %u which can no " "longer be found.\n", (unsigned long long)ino, cpos); ret = -EROFS; goto out; } rec = &el->l_recs[index]; BUG_ON(ext_flags != rec->e_flags); /* * after moving/defraging to new location, the extent is not going * to be refcounted anymore. */ replace_rec.e_flags = ext_flags & ~OCFS2_EXT_REFCOUNTED; ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), context->et.et_root_bh, OCFS2_JOURNAL_ACCESS_WRITE); if (ret) { mlog_errno(ret); goto out; } ret = ocfs2_split_extent(handle, &context->et, path, index, &replace_rec, context->meta_ac, &context->dealloc); if (ret) { mlog_errno(ret); goto out; } ocfs2_journal_dirty(handle, context->et.et_root_bh); context->new_phys_cpos = new_p_cpos; /* * need I to append truncate log for old clusters? */ if (old_blkno) { if (ext_flags & OCFS2_EXT_REFCOUNTED) ret = ocfs2_decrease_refcount(inode, handle, ocfs2_blocks_to_clusters(osb->sb, old_blkno), len, context->meta_ac, &context->dealloc, 1); else ret = ocfs2_truncate_log_append(osb, handle, old_blkno, len); } out: return ret; } /* * lock allocators, and reserving appropriate number of bits for * meta blocks and data clusters. * * in some cases, we don't need to reserve clusters, just let data_ac * be NULL. */ static int ocfs2_lock_allocators_move_extents(struct inode *inode, struct ocfs2_extent_tree *et, u32 clusters_to_move, u32 extents_to_split, struct ocfs2_alloc_context **meta_ac, struct ocfs2_alloc_context **data_ac, int extra_blocks, int *credits) { int ret, num_free_extents; unsigned int max_recs_needed = 2 * extents_to_split + clusters_to_move; struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); num_free_extents = ocfs2_num_free_extents(osb, et); if (num_free_extents < 0) { ret = num_free_extents; mlog_errno(ret); goto out; } if (!num_free_extents || (ocfs2_sparse_alloc(osb) && num_free_extents < max_recs_needed)) extra_blocks += ocfs2_extend_meta_needed(et->et_root_el); ret = ocfs2_reserve_new_metadata_blocks(osb, extra_blocks, meta_ac); if (ret) { mlog_errno(ret); goto out; } if (data_ac) { ret = ocfs2_reserve_clusters(osb, clusters_to_move, data_ac); if (ret) { mlog_errno(ret); goto out; } } *credits += ocfs2_calc_extend_credits(osb->sb, et->et_root_el, clusters_to_move + 2); mlog(0, "reserve metadata_blocks: %d, data_clusters: %u, credits: %d\n", extra_blocks, clusters_to_move, *credits); out: if (ret) { if (*meta_ac) { ocfs2_free_alloc_context(*meta_ac); *meta_ac = NULL; } } return ret; } /* * Using one journal handle to guarantee the data consistency in case * crash happens anywhere. * * XXX: defrag can end up with finishing partial extent as requested, * due to not enough contiguous clusters can be found in allocator. */ static int ocfs2_defrag_extent(struct ocfs2_move_extents_context *context, u32 cpos, u32 phys_cpos, u32 *len, int ext_flags) { int ret, credits = 0, extra_blocks = 0, partial = context->partial; handle_t *handle; struct inode *inode = context->inode; struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); struct inode *tl_inode = osb->osb_tl_inode; struct ocfs2_refcount_tree *ref_tree = NULL; u32 new_phys_cpos, new_len; u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos); if ((ext_flags & OCFS2_EXT_REFCOUNTED) && *len) { BUG_ON(!(OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL)); BUG_ON(!context->refcount_loc); ret = ocfs2_lock_refcount_tree(osb, context->refcount_loc, 1, &ref_tree, NULL); if (ret) { mlog_errno(ret); return ret; } ret = ocfs2_prepare_refcount_change_for_del(inode, context->refcount_loc, phys_blkno, *len, &credits, &extra_blocks); if (ret) { mlog_errno(ret); goto out; } } ret = ocfs2_lock_allocators_move_extents(inode, &context->et, *len, 1, &context->meta_ac, &context->data_ac, extra_blocks, &credits); if (ret) { mlog_errno(ret); goto out; } /* * should be using allocation reservation strategy there? * * if (context->data_ac) * context->data_ac->ac_resv = &OCFS2_I(inode)->ip_la_data_resv; */ mutex_lock(&tl_inode->i_mutex); if (ocfs2_truncate_log_needs_flush(osb)) { ret = __ocfs2_flush_truncate_log(osb); if (ret < 0) { mlog_errno(ret); goto out_unlock_mutex; } } handle = ocfs2_start_trans(osb, credits); if (IS_ERR(handle)) { ret = PTR_ERR(handle); mlog_errno(ret); goto out_unlock_mutex; } ret = __ocfs2_claim_clusters(handle, context->data_ac, 1, *len, &new_phys_cpos, &new_len); if (ret) { mlog_errno(ret); goto out_commit; } /* * allowing partial extent moving is kind of 'pros and cons', it makes * whole defragmentation less likely to fail, on the contrary, the bad * thing is it may make the fs even more fragmented after moving, let * userspace make a good decision here. */ if (new_len != *len) { mlog(0, "len_claimed: %u, len: %u\n", new_len, *len); if (!partial) { context->range->me_flags &= ~OCFS2_MOVE_EXT_FL_COMPLETE; ret = -ENOSPC; goto out_commit; } } mlog(0, "cpos: %u, phys_cpos: %u, new_phys_cpos: %u\n", cpos, phys_cpos, new_phys_cpos); ret = __ocfs2_move_extent(handle, context, cpos, new_len, phys_cpos, new_phys_cpos, ext_flags); if (ret) mlog_errno(ret); if (partial && (new_len != *len)) *len = new_len; /* * Here we should write the new page out first if we are * in write-back mode. */ ret = ocfs2_cow_sync_writeback(inode->i_sb, context->inode, cpos, *len); if (ret) mlog_errno(ret); out_commit: ocfs2_commit_trans(osb, handle); out_unlock_mutex: mutex_unlock(&tl_inode->i_mutex); if (context->data_ac) { ocfs2_free_alloc_context(context->data_ac); context->data_ac = NULL; } if (context->meta_ac) { ocfs2_free_alloc_context(context->meta_ac); context->meta_ac = NULL; } out: if (ref_tree) ocfs2_unlock_refcount_tree(osb, ref_tree, 1); return ret; } /* * find the victim alloc group, where #blkno fits. */ static int ocfs2_find_victim_alloc_group(struct inode *inode, u64 vict_blkno, int type, int slot, int *vict_bit, struct buffer_head **ret_bh) { int ret, i, bits_per_unit = 0; u64 blkno; char namebuf[40]; struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); struct buffer_head *ac_bh = NULL, *gd_bh = NULL; struct ocfs2_chain_list *cl; struct ocfs2_chain_rec *rec; struct ocfs2_dinode *ac_dinode; struct ocfs2_group_desc *bg; ocfs2_sprintf_system_inode_name(namebuf, sizeof(namebuf), type, slot); ret = ocfs2_lookup_ino_from_name(osb->sys_root_inode, namebuf, strlen(namebuf), &blkno); if (ret) { ret = -ENOENT; goto out; } ret = ocfs2_read_blocks_sync(osb, blkno, 1, &ac_bh); if (ret) { mlog_errno(ret); goto out; } ac_dinode = (struct ocfs2_dinode *)ac_bh->b_data; cl = &(ac_dinode->id2.i_chain); rec = &(cl->cl_recs[0]); if (type == GLOBAL_BITMAP_SYSTEM_INODE) bits_per_unit = osb->s_clustersize_bits - inode->i_sb->s_blocksize_bits; /* * 'vict_blkno' was out of the valid range. */ if ((vict_blkno < le64_to_cpu(rec->c_blkno)) || (vict_blkno >= (le32_to_cpu(ac_dinode->id1.bitmap1.i_total) << bits_per_unit))) { ret = -EINVAL; goto out; } for (i = 0; i < le16_to_cpu(cl->cl_next_free_rec); i++) { rec = &(cl->cl_recs[i]); if (!rec) continue; bg = NULL; do { if (!bg) blkno = le64_to_cpu(rec->c_blkno); else blkno = le64_to_cpu(bg->bg_next_group); if (gd_bh) { brelse(gd_bh); gd_bh = NULL; } ret = ocfs2_read_blocks_sync(osb, blkno, 1, &gd_bh); if (ret) { mlog_errno(ret); goto out; } bg = (struct ocfs2_group_desc *)gd_bh->b_data; if (vict_blkno < (le64_to_cpu(bg->bg_blkno) + le16_to_cpu(bg->bg_bits))) { *ret_bh = gd_bh; *vict_bit = (vict_blkno - blkno) >> bits_per_unit; mlog(0, "find the victim group: #%llu, " "total_bits: %u, vict_bit: %u\n", blkno, le16_to_cpu(bg->bg_bits), *vict_bit); goto out; } } while (le64_to_cpu(bg->bg_next_group)); } ret = -EINVAL; out: brelse(ac_bh); /* * caller has to release the gd_bh properly. */ return ret; } /* * XXX: helper to validate and adjust moving goal. */ static int ocfs2_validate_and_adjust_move_goal(struct inode *inode, struct ocfs2_move_extents *range) { int ret, goal_bit = 0; struct buffer_head *gd_bh = NULL; struct ocfs2_group_desc *bg = NULL; struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); int c_to_b = 1 << (osb->s_clustersize_bits - inode->i_sb->s_blocksize_bits); /* * make goal become cluster aligned. */ range->me_goal = ocfs2_block_to_cluster_start(inode->i_sb, range->me_goal); /* * moving goal is not allowd to start with a group desc blok(#0 blk) * let's compromise to the latter cluster. */ if (range->me_goal == le64_to_cpu(bg->bg_blkno)) range->me_goal += c_to_b; /* * validate goal sits within global_bitmap, and return the victim * group desc */ ret = ocfs2_find_victim_alloc_group(inode, range->me_goal, GLOBAL_BITMAP_SYSTEM_INODE, OCFS2_INVALID_SLOT, &goal_bit, &gd_bh); if (ret) goto out; bg = (struct ocfs2_group_desc *)gd_bh->b_data; /* * movement is not gonna cross two groups. */ if ((le16_to_cpu(bg->bg_bits) - goal_bit) * osb->s_clustersize < range->me_len) { ret = -EINVAL; goto out; } /* * more exact validations/adjustments will be performed later during * moving operation for each extent range. */ mlog(0, "extents get ready to be moved to #%llu block\n", range->me_goal); out: brelse(gd_bh); return ret; } static void ocfs2_probe_alloc_group(struct inode *inode, struct buffer_head *bh, int *goal_bit, u32 move_len, u32 max_hop, u32 *phys_cpos) { int i, used, last_free_bits = 0, base_bit = *goal_bit; struct ocfs2_group_desc *gd = (struct ocfs2_group_desc *)bh->b_data; u32 base_cpos = ocfs2_blocks_to_clusters(inode->i_sb, le64_to_cpu(gd->bg_blkno)); for (i = base_bit; i < le16_to_cpu(gd->bg_bits); i++) { used = ocfs2_test_bit(i, (unsigned long *)gd->bg_bitmap); if (used) { /* * we even tried searching the free chunk by jumping * a 'max_hop' distance, but still failed. */ if ((i - base_bit) > max_hop) { *phys_cpos = 0; break; } if (last_free_bits) last_free_bits = 0; continue; } else last_free_bits++; if (last_free_bits == move_len) { *goal_bit = i; *phys_cpos = base_cpos + i; break; } } mlog(0, "found phys_cpos: %u to fit the wanted moving.\n", *phys_cpos); } static int ocfs2_alloc_dinode_update_counts(struct inode *inode, handle_t *handle, struct buffer_head *di_bh, u32 num_bits, u16 chain) { int ret; u32 tmp_used; struct ocfs2_dinode *di = (struct ocfs2_dinode *) di_bh->b_data; struct ocfs2_chain_list *cl = (struct ocfs2_chain_list *) &di->id2.i_chain; ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh, OCFS2_JOURNAL_ACCESS_WRITE); if (ret < 0) { mlog_errno(ret); goto out; } tmp_used = le32_to_cpu(di->id1.bitmap1.i_used); di->id1.bitmap1.i_used = cpu_to_le32(num_bits + tmp_used); le32_add_cpu(&cl->cl_recs[chain].c_free, -num_bits); ocfs2_journal_dirty(handle, di_bh); out: return ret; } static inline int ocfs2_block_group_set_bits(handle_t *handle, struct inode *alloc_inode, struct ocfs2_group_desc *bg, struct buffer_head *group_bh, unsigned int bit_off, unsigned int num_bits) { int status; void *bitmap = bg->bg_bitmap; int journal_type = OCFS2_JOURNAL_ACCESS_WRITE; /* All callers get the descriptor via * ocfs2_read_group_descriptor(). Any corruption is a code bug. */ BUG_ON(!OCFS2_IS_VALID_GROUP_DESC(bg)); BUG_ON(le16_to_cpu(bg->bg_free_bits_count) < num_bits); mlog(0, "block_group_set_bits: off = %u, num = %u\n", bit_off, num_bits); if (ocfs2_is_cluster_bitmap(alloc_inode)) journal_type = OCFS2_JOURNAL_ACCESS_UNDO; status = ocfs2_journal_access_gd(handle, INODE_CACHE(alloc_inode), group_bh, journal_type); if (status < 0) { mlog_errno(status); goto bail; } le16_add_cpu(&bg->bg_free_bits_count, -num_bits); if (le16_to_cpu(bg->bg_free_bits_count) > le16_to_cpu(bg->bg_bits)) { ocfs2_error(alloc_inode->i_sb, "Group descriptor # %llu has bit" " count %u but claims %u are freed. num_bits %d", (unsigned long long)le64_to_cpu(bg->bg_blkno), le16_to_cpu(bg->bg_bits), le16_to_cpu(bg->bg_free_bits_count), num_bits); return -EROFS; } while (num_bits--) ocfs2_set_bit(bit_off++, bitmap); ocfs2_journal_dirty(handle, group_bh); bail: return status; } static int ocfs2_move_extent(struct ocfs2_move_extents_context *context, u32 cpos, u32 phys_cpos, u32 *new_phys_cpos, u32 len, int ext_flags) { int ret, credits = 0, extra_blocks = 0, goal_bit = 0; handle_t *handle; struct inode *inode = context->inode; struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); struct inode *tl_inode = osb->osb_tl_inode; struct inode *gb_inode = NULL; struct buffer_head *gb_bh = NULL; struct buffer_head *gd_bh = NULL; struct ocfs2_group_desc *gd; struct ocfs2_refcount_tree *ref_tree = NULL; u32 move_max_hop = ocfs2_blocks_to_clusters(inode->i_sb, context->range->me_threshold); u64 phys_blkno, new_phys_blkno; phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos); if ((ext_flags & OCFS2_EXT_REFCOUNTED) && len) { BUG_ON(!(OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL)); BUG_ON(!context->refcount_loc); ret = ocfs2_lock_refcount_tree(osb, context->refcount_loc, 1, &ref_tree, NULL); if (ret) { mlog_errno(ret); return ret; } ret = ocfs2_prepare_refcount_change_for_del(inode, context->refcount_loc, phys_blkno, len, &credits, &extra_blocks); if (ret) { mlog_errno(ret); goto out; } } ret = ocfs2_lock_allocators_move_extents(inode, &context->et, len, 1, &context->meta_ac, NULL, extra_blocks, &credits); if (ret) { mlog_errno(ret); goto out; } /* * need to count 2 extra credits for global_bitmap inode and * group descriptor. */ credits += OCFS2_INODE_UPDATE_CREDITS + 1; /* * ocfs2_move_extent() didn't reserve any clusters in lock_allocators() * logic, while we still need to lock the global_bitmap. */ gb_inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE, OCFS2_INVALID_SLOT); if (!gb_inode) { mlog(ML_ERROR, "unable to get global_bitmap inode\n"); ret = -EIO; goto out; } mutex_lock(&gb_inode->i_mutex); ret = ocfs2_inode_lock(gb_inode, &gb_bh, 1); if (ret) { mlog_errno(ret); goto out_unlock_gb_mutex; } mutex_lock(&tl_inode->i_mutex); handle = ocfs2_start_trans(osb, credits); if (IS_ERR(handle)) { ret = PTR_ERR(handle); mlog_errno(ret); goto out_unlock_tl_inode; } new_phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, *new_phys_cpos); ret = ocfs2_find_victim_alloc_group(inode, new_phys_blkno, GLOBAL_BITMAP_SYSTEM_INODE, OCFS2_INVALID_SLOT, &goal_bit, &gd_bh); if (ret) { mlog_errno(ret); goto out_commit; } /* * probe the victim cluster group to find a proper * region to fit wanted movement, it even will perfrom * a best-effort attempt by compromising to a threshold * around the goal. */ ocfs2_probe_alloc_group(inode, gd_bh, &goal_bit, len, move_max_hop, new_phys_cpos); if (!new_phys_cpos) { ret = -ENOSPC; goto out_commit; } ret = __ocfs2_move_extent(handle, context, cpos, len, phys_cpos, *new_phys_cpos, ext_flags); if (ret) { mlog_errno(ret); goto out_commit; } gd = (struct ocfs2_group_desc *)gd_bh->b_data; ret = ocfs2_alloc_dinode_update_counts(gb_inode, handle, gb_bh, len, le16_to_cpu(gd->bg_chain)); if (ret) { mlog_errno(ret); goto out_commit; } ret = ocfs2_block_group_set_bits(handle, gb_inode, gd, gd_bh, goal_bit, len); if (ret) mlog_errno(ret); /* * Here we should write the new page out first if we are * in write-back mode. */ ret = ocfs2_cow_sync_writeback(inode->i_sb, context->inode, cpos, len); if (ret) mlog_errno(ret); out_commit: ocfs2_commit_trans(osb, handle); brelse(gd_bh); out_unlock_tl_inode: mutex_unlock(&tl_inode->i_mutex); ocfs2_inode_unlock(gb_inode, 1); out_unlock_gb_mutex: mutex_unlock(&gb_inode->i_mutex); brelse(gb_bh); iput(gb_inode); out: if (context->meta_ac) { ocfs2_free_alloc_context(context->meta_ac); context->meta_ac = NULL; } if (ref_tree) ocfs2_unlock_refcount_tree(osb, ref_tree, 1); return ret; } /* * Helper to calculate the defraging length in one run according to threshold. */ static void ocfs2_calc_extent_defrag_len(u32 *alloc_size, u32 *len_defraged, u32 threshold, int *skip) { if ((*alloc_size + *len_defraged) < threshold) { /* * proceed defragmentation until we meet the thresh */ *len_defraged += *alloc_size; } else if (*len_defraged == 0) { /* * XXX: skip a large extent. */ *skip = 1; } else { /* * split this extent to coalesce with former pieces as * to reach the threshold. * * we're done here with one cycle of defragmentation * in a size of 'thresh', resetting 'len_defraged' * forces a new defragmentation. */ *alloc_size = threshold - *len_defraged; *len_defraged = 0; } } static int __ocfs2_move_extents_range(struct buffer_head *di_bh, struct ocfs2_move_extents_context *context) { int ret = 0, flags, do_defrag, skip = 0; u32 cpos, phys_cpos, move_start, len_to_move, alloc_size; u32 len_defraged = 0, defrag_thresh = 0, new_phys_cpos = 0; struct inode *inode = context->inode; struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data; struct ocfs2_move_extents *range = context->range; struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); if ((inode->i_size == 0) || (range->me_len == 0)) return 0; if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) return 0; context->refcount_loc = le64_to_cpu(di->i_refcount_loc); ocfs2_init_dinode_extent_tree(&context->et, INODE_CACHE(inode), di_bh); ocfs2_init_dealloc_ctxt(&context->dealloc); /* * TO-DO XXX: * * - xattr extents. */ do_defrag = context->auto_defrag; /* * extents moving happens in unit of clusters, for the sake * of simplicity, we may ignore two clusters where 'byte_start' * and 'byte_start + len' were within. */ move_start = ocfs2_clusters_for_bytes(osb->sb, range->me_start); len_to_move = (range->me_start + range->me_len) >> osb->s_clustersize_bits; if (len_to_move >= move_start) len_to_move -= move_start; else len_to_move = 0; if (do_defrag) { defrag_thresh = range->me_threshold >> osb->s_clustersize_bits; if (defrag_thresh <= 1) goto done; } else new_phys_cpos = ocfs2_blocks_to_clusters(inode->i_sb, range->me_goal); mlog(0, "Inode: %llu, start: %llu, len: %llu, cstart: %u, clen: %u, " "thresh: %u\n", (unsigned long long)OCFS2_I(inode)->ip_blkno, (unsigned long long)range->me_start, (unsigned long long)range->me_len, move_start, len_to_move, defrag_thresh); cpos = move_start; while (len_to_move) { ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &alloc_size, &flags); if (ret) { mlog_errno(ret); goto out; } if (alloc_size > len_to_move) alloc_size = len_to_move; /* * XXX: how to deal with a hole: * * - skip the hole of course * - force a new defragmentation */ if (!phys_cpos) { if (do_defrag) len_defraged = 0; goto next; } if (do_defrag) { ocfs2_calc_extent_defrag_len(&alloc_size, &len_defraged, defrag_thresh, &skip); /* * skip large extents */ if (skip) { skip = 0; goto next; } mlog(0, "#Defrag: cpos: %u, phys_cpos: %u, " "alloc_size: %u, len_defraged: %u\n", cpos, phys_cpos, alloc_size, len_defraged); ret = ocfs2_defrag_extent(context, cpos, phys_cpos, &alloc_size, flags); } else { ret = ocfs2_move_extent(context, cpos, phys_cpos, &new_phys_cpos, alloc_size, flags); new_phys_cpos += alloc_size; } if (ret < 0) { mlog_errno(ret); goto out; } context->clusters_moved += alloc_size; next: cpos += alloc_size; len_to_move -= alloc_size; } done: range->me_flags |= OCFS2_MOVE_EXT_FL_COMPLETE; out: range->me_moved_len = ocfs2_clusters_to_bytes(osb->sb, context->clusters_moved); range->me_new_offset = ocfs2_clusters_to_bytes(osb->sb, context->new_phys_cpos); ocfs2_schedule_truncate_log_flush(osb, 1); ocfs2_run_deallocs(osb, &context->dealloc); return ret; } static int ocfs2_move_extents(struct ocfs2_move_extents_context *context) { int status; handle_t *handle; struct inode *inode = context->inode; struct ocfs2_dinode *di; struct buffer_head *di_bh = NULL; struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); if (!inode) return -ENOENT; if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb)) return -EROFS; mutex_lock(&inode->i_mutex); /* * This prevents concurrent writes from other nodes */ status = ocfs2_rw_lock(inode, 1); if (status) { mlog_errno(status); goto out; } status = ocfs2_inode_lock(inode, &di_bh, 1); if (status) { mlog_errno(status); goto out_rw_unlock; } /* * rememer ip_xattr_sem also needs to be held if necessary */ down_write(&OCFS2_I(inode)->ip_alloc_sem); status = __ocfs2_move_extents_range(di_bh, context); up_write(&OCFS2_I(inode)->ip_alloc_sem); if (status) { mlog_errno(status); goto out_inode_unlock; } /* * We update ctime for these changes */ handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); if (IS_ERR(handle)) { status = PTR_ERR(handle); mlog_errno(status); goto out_inode_unlock; } status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh, OCFS2_JOURNAL_ACCESS_WRITE); if (status) { mlog_errno(status); goto out_commit; } di = (struct ocfs2_dinode *)di_bh->b_data; inode->i_ctime = CURRENT_TIME; di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec); di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec); ocfs2_journal_dirty(handle, di_bh); out_commit: ocfs2_commit_trans(osb, handle); out_inode_unlock: brelse(di_bh); ocfs2_inode_unlock(inode, 1); out_rw_unlock: ocfs2_rw_unlock(inode, 1); out: mutex_unlock(&inode->i_mutex); return status; } int ocfs2_ioctl_move_extents(struct file *filp, void __user *argp) { int status; struct inode *inode = filp->f_path.dentry->d_inode; struct ocfs2_move_extents range; struct ocfs2_move_extents_context *context = NULL; status = mnt_want_write(filp->f_path.mnt); if (status) return status; if ((!S_ISREG(inode->i_mode)) || !(filp->f_mode & FMODE_WRITE)) goto out; if (inode->i_flags & (S_IMMUTABLE|S_APPEND)) { status = -EPERM; goto out; } context = kzalloc(sizeof(struct ocfs2_move_extents_context), GFP_NOFS); if (!context) { status = -ENOMEM; mlog_errno(status); goto out; } context->inode = inode; context->file = filp; if (argp) { if (copy_from_user(&range, (struct ocfs2_move_extents *)argp, sizeof(range))) { status = -EFAULT; goto out; } } else { status = -EINVAL; goto out; } if (range.me_start > i_size_read(inode)) goto out; if (range.me_start + range.me_len > i_size_read(inode)) range.me_len = i_size_read(inode) - range.me_start; context->range = ⦥ if (range.me_flags & OCFS2_MOVE_EXT_FL_AUTO_DEFRAG) { context->auto_defrag = 1; /* * ok, the default theshold for the defragmentation * is 1M, since our maximum clustersize was 1M also. * any thought? */ if (!range.me_threshold) range.me_threshold = 1024 * 1024; if (range.me_threshold > i_size_read(inode)) range.me_threshold = i_size_read(inode); if (range.me_flags & OCFS2_MOVE_EXT_FL_PART_DEFRAG) context->partial = 1; } else { /* * first best-effort attempt to validate and adjust the goal * (physical address in block), while it can't guarantee later * operation can succeed all the time since global_bitmap may * change a bit over time. */ status = ocfs2_validate_and_adjust_move_goal(inode, &range); if (status) goto out; } status = ocfs2_move_extents(context); if (status) mlog_errno(status); out: /* * movement/defragmentation may end up being partially completed, * that's the reason why we need to return userspace the finished * length and new_offset even if failure happens somewhere. */ if (argp) { if (copy_to_user((struct ocfs2_move_extents *)argp, &range, sizeof(range))) status = -EFAULT; } kfree(context); mnt_drop_write(filp->f_path.mnt); return status; }