| /* |
| * fs/f2fs/recovery.c |
| * |
| * Copyright (c) 2012 Samsung Electronics Co., Ltd. |
| * http://www.samsung.com/ |
| * |
| * 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. |
| */ |
| #include <linux/fs.h> |
| #include <linux/f2fs_fs.h> |
| #include "f2fs.h" |
| #include "node.h" |
| #include "segment.h" |
| |
| static struct kmem_cache *fsync_entry_slab; |
| |
| bool space_for_roll_forward(struct f2fs_sb_info *sbi) |
| { |
| if (sbi->last_valid_block_count + sbi->alloc_valid_block_count |
| > sbi->user_block_count) |
| return false; |
| return true; |
| } |
| |
| static struct fsync_inode_entry *get_fsync_inode(struct list_head *head, |
| nid_t ino) |
| { |
| struct list_head *this; |
| struct fsync_inode_entry *entry; |
| |
| list_for_each(this, head) { |
| entry = list_entry(this, struct fsync_inode_entry, list); |
| if (entry->inode->i_ino == ino) |
| return entry; |
| } |
| return NULL; |
| } |
| |
| static int recover_dentry(struct page *ipage, struct inode *inode) |
| { |
| struct f2fs_node *raw_node = (struct f2fs_node *)kmap(ipage); |
| struct f2fs_inode *raw_inode = &(raw_node->i); |
| struct dentry dent, parent; |
| struct f2fs_dir_entry *de; |
| struct page *page; |
| struct inode *dir; |
| int err = 0; |
| |
| if (!is_dent_dnode(ipage)) |
| goto out; |
| |
| dir = f2fs_iget(inode->i_sb, le32_to_cpu(raw_inode->i_pino)); |
| if (IS_ERR(dir)) { |
| err = -EINVAL; |
| goto out; |
| } |
| |
| parent.d_inode = dir; |
| dent.d_parent = &parent; |
| dent.d_name.len = le32_to_cpu(raw_inode->i_namelen); |
| dent.d_name.name = raw_inode->i_name; |
| |
| de = f2fs_find_entry(dir, &dent.d_name, &page); |
| if (de) { |
| kunmap(page); |
| f2fs_put_page(page, 0); |
| } else { |
| err = f2fs_add_link(&dent, inode); |
| } |
| iput(dir); |
| out: |
| kunmap(ipage); |
| return err; |
| } |
| |
| static int recover_inode(struct inode *inode, struct page *node_page) |
| { |
| void *kaddr = page_address(node_page); |
| struct f2fs_node *raw_node = (struct f2fs_node *)kaddr; |
| struct f2fs_inode *raw_inode = &(raw_node->i); |
| |
| inode->i_mode = le16_to_cpu(raw_inode->i_mode); |
| i_size_write(inode, le64_to_cpu(raw_inode->i_size)); |
| inode->i_atime.tv_sec = le64_to_cpu(raw_inode->i_mtime); |
| inode->i_ctime.tv_sec = le64_to_cpu(raw_inode->i_ctime); |
| inode->i_mtime.tv_sec = le64_to_cpu(raw_inode->i_mtime); |
| inode->i_atime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec); |
| inode->i_ctime.tv_nsec = le32_to_cpu(raw_inode->i_ctime_nsec); |
| inode->i_mtime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec); |
| |
| return recover_dentry(node_page, inode); |
| } |
| |
| static int find_fsync_dnodes(struct f2fs_sb_info *sbi, struct list_head *head) |
| { |
| unsigned long long cp_ver = le64_to_cpu(sbi->ckpt->checkpoint_ver); |
| struct curseg_info *curseg; |
| struct page *page; |
| block_t blkaddr; |
| int err = 0; |
| |
| /* get node pages in the current segment */ |
| curseg = CURSEG_I(sbi, CURSEG_WARM_NODE); |
| blkaddr = START_BLOCK(sbi, curseg->segno) + curseg->next_blkoff; |
| |
| /* read node page */ |
| page = alloc_page(GFP_F2FS_ZERO); |
| if (IS_ERR(page)) |
| return PTR_ERR(page); |
| lock_page(page); |
| |
| while (1) { |
| struct fsync_inode_entry *entry; |
| |
| if (f2fs_readpage(sbi, page, blkaddr, READ_SYNC)) |
| goto out; |
| |
| if (cp_ver != cpver_of_node(page)) |
| goto out; |
| |
| if (!is_fsync_dnode(page)) |
| goto next; |
| |
| entry = get_fsync_inode(head, ino_of_node(page)); |
| if (entry) { |
| entry->blkaddr = blkaddr; |
| if (IS_INODE(page) && is_dent_dnode(page)) |
| set_inode_flag(F2FS_I(entry->inode), |
| FI_INC_LINK); |
| } else { |
| if (IS_INODE(page) && is_dent_dnode(page)) { |
| if (recover_inode_page(sbi, page)) { |
| err = -ENOMEM; |
| goto out; |
| } |
| } |
| |
| /* add this fsync inode to the list */ |
| entry = kmem_cache_alloc(fsync_entry_slab, GFP_NOFS); |
| if (!entry) { |
| err = -ENOMEM; |
| goto out; |
| } |
| |
| entry->inode = f2fs_iget(sbi->sb, ino_of_node(page)); |
| if (IS_ERR(entry->inode)) { |
| err = PTR_ERR(entry->inode); |
| kmem_cache_free(fsync_entry_slab, entry); |
| goto out; |
| } |
| |
| list_add_tail(&entry->list, head); |
| entry->blkaddr = blkaddr; |
| } |
| if (IS_INODE(page)) { |
| err = recover_inode(entry->inode, page); |
| if (err) |
| goto out; |
| } |
| next: |
| /* check next segment */ |
| blkaddr = next_blkaddr_of_node(page); |
| ClearPageUptodate(page); |
| } |
| out: |
| unlock_page(page); |
| __free_pages(page, 0); |
| return err; |
| } |
| |
| static void destroy_fsync_dnodes(struct f2fs_sb_info *sbi, |
| struct list_head *head) |
| { |
| struct fsync_inode_entry *entry, *tmp; |
| |
| list_for_each_entry_safe(entry, tmp, head, list) { |
| iput(entry->inode); |
| list_del(&entry->list); |
| kmem_cache_free(fsync_entry_slab, entry); |
| } |
| } |
| |
| static void check_index_in_prev_nodes(struct f2fs_sb_info *sbi, |
| block_t blkaddr) |
| { |
| struct seg_entry *sentry; |
| unsigned int segno = GET_SEGNO(sbi, blkaddr); |
| unsigned short blkoff = GET_SEGOFF_FROM_SEG0(sbi, blkaddr) & |
| (sbi->blocks_per_seg - 1); |
| struct f2fs_summary sum; |
| nid_t ino; |
| void *kaddr; |
| struct inode *inode; |
| struct page *node_page; |
| block_t bidx; |
| int i; |
| |
| sentry = get_seg_entry(sbi, segno); |
| if (!f2fs_test_bit(blkoff, sentry->cur_valid_map)) |
| return; |
| |
| /* Get the previous summary */ |
| for (i = CURSEG_WARM_DATA; i <= CURSEG_COLD_DATA; i++) { |
| struct curseg_info *curseg = CURSEG_I(sbi, i); |
| if (curseg->segno == segno) { |
| sum = curseg->sum_blk->entries[blkoff]; |
| break; |
| } |
| } |
| if (i > CURSEG_COLD_DATA) { |
| struct page *sum_page = get_sum_page(sbi, segno); |
| struct f2fs_summary_block *sum_node; |
| kaddr = page_address(sum_page); |
| sum_node = (struct f2fs_summary_block *)kaddr; |
| sum = sum_node->entries[blkoff]; |
| f2fs_put_page(sum_page, 1); |
| } |
| |
| /* Get the node page */ |
| node_page = get_node_page(sbi, le32_to_cpu(sum.nid)); |
| bidx = start_bidx_of_node(ofs_of_node(node_page)) + |
| le16_to_cpu(sum.ofs_in_node); |
| ino = ino_of_node(node_page); |
| f2fs_put_page(node_page, 1); |
| |
| /* Deallocate previous index in the node page */ |
| inode = f2fs_iget_nowait(sbi->sb, ino); |
| if (IS_ERR(inode)) |
| return; |
| |
| truncate_hole(inode, bidx, bidx + 1); |
| iput(inode); |
| } |
| |
| static void do_recover_data(struct f2fs_sb_info *sbi, struct inode *inode, |
| struct page *page, block_t blkaddr) |
| { |
| unsigned int start, end; |
| struct dnode_of_data dn; |
| struct f2fs_summary sum; |
| struct node_info ni; |
| |
| start = start_bidx_of_node(ofs_of_node(page)); |
| if (IS_INODE(page)) |
| end = start + ADDRS_PER_INODE; |
| else |
| end = start + ADDRS_PER_BLOCK; |
| |
| set_new_dnode(&dn, inode, NULL, NULL, 0); |
| if (get_dnode_of_data(&dn, start, 0)) |
| return; |
| |
| wait_on_page_writeback(dn.node_page); |
| |
| get_node_info(sbi, dn.nid, &ni); |
| BUG_ON(ni.ino != ino_of_node(page)); |
| BUG_ON(ofs_of_node(dn.node_page) != ofs_of_node(page)); |
| |
| for (; start < end; start++) { |
| block_t src, dest; |
| |
| src = datablock_addr(dn.node_page, dn.ofs_in_node); |
| dest = datablock_addr(page, dn.ofs_in_node); |
| |
| if (src != dest && dest != NEW_ADDR && dest != NULL_ADDR) { |
| if (src == NULL_ADDR) { |
| int err = reserve_new_block(&dn); |
| /* We should not get -ENOSPC */ |
| BUG_ON(err); |
| } |
| |
| /* Check the previous node page having this index */ |
| check_index_in_prev_nodes(sbi, dest); |
| |
| set_summary(&sum, dn.nid, dn.ofs_in_node, ni.version); |
| |
| /* write dummy data page */ |
| recover_data_page(sbi, NULL, &sum, src, dest); |
| update_extent_cache(dest, &dn); |
| } |
| dn.ofs_in_node++; |
| } |
| |
| /* write node page in place */ |
| set_summary(&sum, dn.nid, 0, 0); |
| if (IS_INODE(dn.node_page)) |
| sync_inode_page(&dn); |
| |
| copy_node_footer(dn.node_page, page); |
| fill_node_footer(dn.node_page, dn.nid, ni.ino, |
| ofs_of_node(page), false); |
| set_page_dirty(dn.node_page); |
| |
| recover_node_page(sbi, dn.node_page, &sum, &ni, blkaddr); |
| f2fs_put_dnode(&dn); |
| } |
| |
| static void recover_data(struct f2fs_sb_info *sbi, |
| struct list_head *head, int type) |
| { |
| unsigned long long cp_ver = le64_to_cpu(sbi->ckpt->checkpoint_ver); |
| struct curseg_info *curseg; |
| struct page *page; |
| block_t blkaddr; |
| |
| /* get node pages in the current segment */ |
| curseg = CURSEG_I(sbi, type); |
| blkaddr = NEXT_FREE_BLKADDR(sbi, curseg); |
| |
| /* read node page */ |
| page = alloc_page(GFP_NOFS | __GFP_ZERO); |
| if (IS_ERR(page)) |
| return; |
| lock_page(page); |
| |
| while (1) { |
| struct fsync_inode_entry *entry; |
| |
| if (f2fs_readpage(sbi, page, blkaddr, READ_SYNC)) |
| goto out; |
| |
| if (cp_ver != cpver_of_node(page)) |
| goto out; |
| |
| entry = get_fsync_inode(head, ino_of_node(page)); |
| if (!entry) |
| goto next; |
| |
| do_recover_data(sbi, entry->inode, page, blkaddr); |
| |
| if (entry->blkaddr == blkaddr) { |
| iput(entry->inode); |
| list_del(&entry->list); |
| kmem_cache_free(fsync_entry_slab, entry); |
| } |
| next: |
| /* check next segment */ |
| blkaddr = next_blkaddr_of_node(page); |
| ClearPageUptodate(page); |
| } |
| out: |
| unlock_page(page); |
| __free_pages(page, 0); |
| |
| allocate_new_segments(sbi); |
| } |
| |
| void recover_fsync_data(struct f2fs_sb_info *sbi) |
| { |
| struct list_head inode_list; |
| |
| fsync_entry_slab = f2fs_kmem_cache_create("f2fs_fsync_inode_entry", |
| sizeof(struct fsync_inode_entry), NULL); |
| if (unlikely(!fsync_entry_slab)) |
| return; |
| |
| INIT_LIST_HEAD(&inode_list); |
| |
| /* step #1: find fsynced inode numbers */ |
| if (find_fsync_dnodes(sbi, &inode_list)) |
| goto out; |
| |
| if (list_empty(&inode_list)) |
| goto out; |
| |
| /* step #2: recover data */ |
| sbi->por_doing = 1; |
| recover_data(sbi, &inode_list, CURSEG_WARM_NODE); |
| sbi->por_doing = 0; |
| BUG_ON(!list_empty(&inode_list)); |
| out: |
| destroy_fsync_dnodes(sbi, &inode_list); |
| kmem_cache_destroy(fsync_entry_slab); |
| write_checkpoint(sbi, false, false); |
| } |