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![Dan Carpenter](/assets/img/avatar_default.png)
"inode" isn't NULL here, and also we dereference it on the previous line so static checkers get annoyed. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Cc: Mark Fasheh <mfasheh@suse.com> Cc: Joel Becker <jlbec@evilplan.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1075 lines
25 KiB
C
1075 lines
25 KiB
C
/* -*- mode: c; c-basic-offset: 8; -*-
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* vim: noexpandtab sw=8 ts=8 sts=0:
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*
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* move_extents.c
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*
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* Copyright (C) 2011 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*/
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#include <linux/fs.h>
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#include <linux/types.h>
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#include <linux/mount.h>
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#include <linux/swap.h>
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#include <cluster/masklog.h>
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#include "ocfs2.h"
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#include "ocfs2_ioctl.h"
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#include "alloc.h"
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#include "aops.h"
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#include "dlmglue.h"
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#include "extent_map.h"
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#include "inode.h"
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#include "journal.h"
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#include "suballoc.h"
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#include "uptodate.h"
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#include "super.h"
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#include "dir.h"
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#include "buffer_head_io.h"
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#include "sysfile.h"
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#include "refcounttree.h"
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#include "move_extents.h"
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struct ocfs2_move_extents_context {
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struct inode *inode;
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struct file *file;
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int auto_defrag;
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int partial;
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int credits;
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u32 new_phys_cpos;
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u32 clusters_moved;
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u64 refcount_loc;
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struct ocfs2_move_extents *range;
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struct ocfs2_extent_tree et;
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struct ocfs2_alloc_context *meta_ac;
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struct ocfs2_alloc_context *data_ac;
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struct ocfs2_cached_dealloc_ctxt dealloc;
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};
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static int __ocfs2_move_extent(handle_t *handle,
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struct ocfs2_move_extents_context *context,
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u32 cpos, u32 len, u32 p_cpos, u32 new_p_cpos,
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int ext_flags)
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{
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int ret = 0, index;
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struct inode *inode = context->inode;
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struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
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struct ocfs2_extent_rec *rec, replace_rec;
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struct ocfs2_path *path = NULL;
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struct ocfs2_extent_list *el;
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u64 ino = ocfs2_metadata_cache_owner(context->et.et_ci);
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u64 old_blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cpos);
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ret = ocfs2_duplicate_clusters_by_page(handle, inode, cpos,
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p_cpos, new_p_cpos, len);
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if (ret) {
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mlog_errno(ret);
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goto out;
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}
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memset(&replace_rec, 0, sizeof(replace_rec));
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replace_rec.e_cpos = cpu_to_le32(cpos);
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replace_rec.e_leaf_clusters = cpu_to_le16(len);
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replace_rec.e_blkno = cpu_to_le64(ocfs2_clusters_to_blocks(inode->i_sb,
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new_p_cpos));
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path = ocfs2_new_path_from_et(&context->et);
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if (!path) {
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ret = -ENOMEM;
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mlog_errno(ret);
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goto out;
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}
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ret = ocfs2_find_path(INODE_CACHE(inode), path, cpos);
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if (ret) {
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mlog_errno(ret);
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goto out;
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}
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el = path_leaf_el(path);
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index = ocfs2_search_extent_list(el, cpos);
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if (index == -1) {
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ocfs2_error(inode->i_sb,
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"Inode %llu has an extent at cpos %u which can no "
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"longer be found.\n",
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(unsigned long long)ino, cpos);
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ret = -EROFS;
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goto out;
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}
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rec = &el->l_recs[index];
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BUG_ON(ext_flags != rec->e_flags);
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/*
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* after moving/defraging to new location, the extent is not going
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* to be refcounted anymore.
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*/
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replace_rec.e_flags = ext_flags & ~OCFS2_EXT_REFCOUNTED;
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ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode),
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context->et.et_root_bh,
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OCFS2_JOURNAL_ACCESS_WRITE);
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if (ret) {
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mlog_errno(ret);
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goto out;
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}
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ret = ocfs2_split_extent(handle, &context->et, path, index,
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&replace_rec, context->meta_ac,
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&context->dealloc);
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if (ret) {
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mlog_errno(ret);
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goto out;
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}
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ocfs2_journal_dirty(handle, context->et.et_root_bh);
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context->new_phys_cpos = new_p_cpos;
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/*
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* need I to append truncate log for old clusters?
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*/
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if (old_blkno) {
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if (ext_flags & OCFS2_EXT_REFCOUNTED)
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ret = ocfs2_decrease_refcount(inode, handle,
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ocfs2_blocks_to_clusters(osb->sb,
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old_blkno),
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len, context->meta_ac,
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&context->dealloc, 1);
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else
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ret = ocfs2_truncate_log_append(osb, handle,
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old_blkno, len);
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}
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ocfs2_update_inode_fsync_trans(handle, inode, 0);
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out:
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ocfs2_free_path(path);
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return ret;
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}
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/*
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* lock allocators, and reserving appropriate number of bits for
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* meta blocks and data clusters.
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*
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* in some cases, we don't need to reserve clusters, just let data_ac
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* be NULL.
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*/
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static int ocfs2_lock_allocators_move_extents(struct inode *inode,
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struct ocfs2_extent_tree *et,
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u32 clusters_to_move,
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u32 extents_to_split,
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struct ocfs2_alloc_context **meta_ac,
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struct ocfs2_alloc_context **data_ac,
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int extra_blocks,
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int *credits)
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{
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int ret, num_free_extents;
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unsigned int max_recs_needed = 2 * extents_to_split + clusters_to_move;
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struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
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num_free_extents = ocfs2_num_free_extents(osb, et);
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if (num_free_extents < 0) {
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ret = num_free_extents;
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mlog_errno(ret);
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goto out;
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}
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if (!num_free_extents ||
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(ocfs2_sparse_alloc(osb) && num_free_extents < max_recs_needed))
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extra_blocks += ocfs2_extend_meta_needed(et->et_root_el);
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ret = ocfs2_reserve_new_metadata_blocks(osb, extra_blocks, meta_ac);
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if (ret) {
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mlog_errno(ret);
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goto out;
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}
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if (data_ac) {
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ret = ocfs2_reserve_clusters(osb, clusters_to_move, data_ac);
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if (ret) {
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mlog_errno(ret);
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goto out;
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}
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}
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*credits += ocfs2_calc_extend_credits(osb->sb, et->et_root_el);
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mlog(0, "reserve metadata_blocks: %d, data_clusters: %u, credits: %d\n",
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extra_blocks, clusters_to_move, *credits);
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out:
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if (ret) {
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if (*meta_ac) {
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ocfs2_free_alloc_context(*meta_ac);
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*meta_ac = NULL;
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}
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}
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return ret;
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}
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/*
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* Using one journal handle to guarantee the data consistency in case
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* crash happens anywhere.
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*
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* XXX: defrag can end up with finishing partial extent as requested,
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* due to not enough contiguous clusters can be found in allocator.
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*/
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static int ocfs2_defrag_extent(struct ocfs2_move_extents_context *context,
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u32 cpos, u32 phys_cpos, u32 *len, int ext_flags)
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{
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int ret, credits = 0, extra_blocks = 0, partial = context->partial;
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handle_t *handle;
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struct inode *inode = context->inode;
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struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
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struct inode *tl_inode = osb->osb_tl_inode;
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struct ocfs2_refcount_tree *ref_tree = NULL;
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u32 new_phys_cpos, new_len;
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u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
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if ((ext_flags & OCFS2_EXT_REFCOUNTED) && *len) {
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BUG_ON(!(OCFS2_I(inode)->ip_dyn_features &
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OCFS2_HAS_REFCOUNT_FL));
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BUG_ON(!context->refcount_loc);
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ret = ocfs2_lock_refcount_tree(osb, context->refcount_loc, 1,
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&ref_tree, NULL);
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if (ret) {
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mlog_errno(ret);
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return ret;
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}
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ret = ocfs2_prepare_refcount_change_for_del(inode,
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context->refcount_loc,
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phys_blkno,
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*len,
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&credits,
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&extra_blocks);
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if (ret) {
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mlog_errno(ret);
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goto out;
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}
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}
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ret = ocfs2_lock_allocators_move_extents(inode, &context->et, *len, 1,
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&context->meta_ac,
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&context->data_ac,
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extra_blocks, &credits);
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if (ret) {
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mlog_errno(ret);
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goto out;
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}
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/*
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* should be using allocation reservation strategy there?
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*
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* if (context->data_ac)
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* context->data_ac->ac_resv = &OCFS2_I(inode)->ip_la_data_resv;
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*/
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mutex_lock(&tl_inode->i_mutex);
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if (ocfs2_truncate_log_needs_flush(osb)) {
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ret = __ocfs2_flush_truncate_log(osb);
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if (ret < 0) {
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mlog_errno(ret);
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goto out_unlock_mutex;
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}
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}
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handle = ocfs2_start_trans(osb, credits);
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if (IS_ERR(handle)) {
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ret = PTR_ERR(handle);
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mlog_errno(ret);
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goto out_unlock_mutex;
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}
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ret = __ocfs2_claim_clusters(handle, context->data_ac, 1, *len,
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&new_phys_cpos, &new_len);
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if (ret) {
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mlog_errno(ret);
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goto out_commit;
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}
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/*
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* allowing partial extent moving is kind of 'pros and cons', it makes
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* whole defragmentation less likely to fail, on the contrary, the bad
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* thing is it may make the fs even more fragmented after moving, let
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* userspace make a good decision here.
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*/
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if (new_len != *len) {
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mlog(0, "len_claimed: %u, len: %u\n", new_len, *len);
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if (!partial) {
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context->range->me_flags &= ~OCFS2_MOVE_EXT_FL_COMPLETE;
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ret = -ENOSPC;
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goto out_commit;
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}
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}
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mlog(0, "cpos: %u, phys_cpos: %u, new_phys_cpos: %u\n", cpos,
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phys_cpos, new_phys_cpos);
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ret = __ocfs2_move_extent(handle, context, cpos, new_len, phys_cpos,
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new_phys_cpos, ext_flags);
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if (ret)
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mlog_errno(ret);
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if (partial && (new_len != *len))
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*len = new_len;
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/*
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* Here we should write the new page out first if we are
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* in write-back mode.
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*/
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ret = ocfs2_cow_sync_writeback(inode->i_sb, context->inode, cpos, *len);
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if (ret)
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mlog_errno(ret);
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out_commit:
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ocfs2_commit_trans(osb, handle);
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out_unlock_mutex:
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mutex_unlock(&tl_inode->i_mutex);
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if (context->data_ac) {
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ocfs2_free_alloc_context(context->data_ac);
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context->data_ac = NULL;
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}
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if (context->meta_ac) {
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ocfs2_free_alloc_context(context->meta_ac);
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context->meta_ac = NULL;
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}
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out:
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if (ref_tree)
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ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
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return ret;
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}
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|
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/*
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* find the victim alloc group, where #blkno fits.
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*/
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static int ocfs2_find_victim_alloc_group(struct inode *inode,
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u64 vict_blkno,
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int type, int slot,
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int *vict_bit,
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struct buffer_head **ret_bh)
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{
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int ret, i, bits_per_unit = 0;
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u64 blkno;
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char namebuf[40];
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struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
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struct buffer_head *ac_bh = NULL, *gd_bh = NULL;
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struct ocfs2_chain_list *cl;
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struct ocfs2_chain_rec *rec;
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struct ocfs2_dinode *ac_dinode;
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struct ocfs2_group_desc *bg;
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|
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ocfs2_sprintf_system_inode_name(namebuf, sizeof(namebuf), type, slot);
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ret = ocfs2_lookup_ino_from_name(osb->sys_root_inode, namebuf,
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strlen(namebuf), &blkno);
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if (ret) {
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ret = -ENOENT;
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goto out;
|
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}
|
|
|
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ret = ocfs2_read_blocks_sync(osb, blkno, 1, &ac_bh);
|
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if (ret) {
|
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mlog_errno(ret);
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goto out;
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}
|
|
|
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ac_dinode = (struct ocfs2_dinode *)ac_bh->b_data;
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cl = &(ac_dinode->id2.i_chain);
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rec = &(cl->cl_recs[0]);
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|
|
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if (type == GLOBAL_BITMAP_SYSTEM_INODE)
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bits_per_unit = osb->s_clustersize_bits -
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inode->i_sb->s_blocksize_bits;
|
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/*
|
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* 'vict_blkno' was out of the valid range.
|
|
*/
|
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if ((vict_blkno < le64_to_cpu(rec->c_blkno)) ||
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(vict_blkno >= ((u64)le32_to_cpu(ac_dinode->id1.bitmap1.i_total) <<
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bits_per_unit))) {
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ret = -EINVAL;
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|
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;
|
|
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);
|
|
/*
|
|
* 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;
|
|
|
|
/*
|
|
* 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;
|
|
|
|
/*
|
|
* 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_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) {
|
|
ocfs2_rollback_alloc_dinode_counts(gb_inode, gb_bh, len,
|
|
le16_to_cpu(gd->bg_chain));
|
|
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 ((i_size_read(inode) == 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 (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_update_inode_fsync_trans(handle, inode, 0);
|
|
|
|
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 = file_inode(filp);
|
|
struct ocfs2_move_extents range;
|
|
struct ocfs2_move_extents_context *context;
|
|
|
|
if (!argp)
|
|
return -EINVAL;
|
|
|
|
status = mnt_want_write_file(filp);
|
|
if (status)
|
|
return status;
|
|
|
|
if ((!S_ISREG(inode->i_mode)) || !(filp->f_mode & FMODE_WRITE)) {
|
|
status = -EPERM;
|
|
goto out_drop;
|
|
}
|
|
|
|
if (inode->i_flags & (S_IMMUTABLE|S_APPEND)) {
|
|
status = -EPERM;
|
|
goto out_drop;
|
|
}
|
|
|
|
context = kzalloc(sizeof(struct ocfs2_move_extents_context), GFP_NOFS);
|
|
if (!context) {
|
|
status = -ENOMEM;
|
|
mlog_errno(status);
|
|
goto out_drop;
|
|
}
|
|
|
|
context->inode = inode;
|
|
context->file = filp;
|
|
|
|
if (copy_from_user(&range, argp, sizeof(range))) {
|
|
status = -EFAULT;
|
|
goto out_free;
|
|
}
|
|
|
|
if (range.me_start > i_size_read(inode)) {
|
|
status = -EINVAL;
|
|
goto out_free;
|
|
}
|
|
|
|
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_copy;
|
|
}
|
|
|
|
status = ocfs2_move_extents(context);
|
|
if (status)
|
|
mlog_errno(status);
|
|
out_copy:
|
|
/*
|
|
* 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 (copy_to_user(argp, &range, sizeof(range)))
|
|
status = -EFAULT;
|
|
|
|
out_free:
|
|
kfree(context);
|
|
out_drop:
|
|
mnt_drop_write_file(filp);
|
|
|
|
return status;
|
|
}
|