/* * 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" /* * Roll forward recovery scenarios. * * [Term] F: fsync_mark, D: dentry_mark * * 1. inode(x) | CP | inode(x) | dnode(F) * -> Update the latest inode(x). * * 2. inode(x) | CP | inode(F) | dnode(F) * -> No problem. * * 3. inode(x) | CP | dnode(F) | inode(x) * -> Recover to the latest dnode(F), and drop the last inode(x) * * 4. inode(x) | CP | dnode(F) | inode(F) * -> No problem. * * 5. CP | inode(x) | dnode(F) * -> The inode(DF) was missing. Should drop this dnode(F). * * 6. CP | inode(DF) | dnode(F) * -> No problem. * * 7. CP | dnode(F) | inode(DF) * -> If f2fs_iget fails, then goto next to find inode(DF). * * 8. CP | dnode(F) | inode(x) * -> If f2fs_iget fails, then goto next to find inode(DF). * But it will fail due to no inode(DF). */ static struct kmem_cache *fsync_entry_slab; bool space_for_roll_forward(struct f2fs_sb_info *sbi) { s64 nalloc = percpu_counter_sum_positive(&sbi->alloc_valid_block_count); if (sbi->last_valid_block_count + nalloc > sbi->user_block_count) return false; return true; } static struct fsync_inode_entry *get_fsync_inode(struct list_head *head, nid_t ino) { struct fsync_inode_entry *entry; list_for_each_entry(entry, head, list) if (entry->inode->i_ino == ino) return entry; return NULL; } static struct fsync_inode_entry *add_fsync_inode(struct f2fs_sb_info *sbi, struct list_head *head, nid_t ino) { struct inode *inode; struct fsync_inode_entry *entry; inode = f2fs_iget_retry(sbi->sb, ino); if (IS_ERR(inode)) return ERR_CAST(inode); entry = f2fs_kmem_cache_alloc(fsync_entry_slab, GFP_F2FS_ZERO); entry->inode = inode; list_add_tail(&entry->list, head); return entry; } static void del_fsync_inode(struct fsync_inode_entry *entry) { iput(entry->inode); list_del(&entry->list); kmem_cache_free(fsync_entry_slab, entry); } static int recover_dentry(struct inode *inode, struct page *ipage, struct list_head *dir_list) { struct f2fs_inode *raw_inode = F2FS_INODE(ipage); nid_t pino = le32_to_cpu(raw_inode->i_pino); struct f2fs_dir_entry *de; struct fscrypt_name fname; struct page *page; struct inode *dir, *einode; struct fsync_inode_entry *entry; int err = 0; char *name; entry = get_fsync_inode(dir_list, pino); if (!entry) { entry = add_fsync_inode(F2FS_I_SB(inode), dir_list, pino); if (IS_ERR(entry)) { dir = ERR_CAST(entry); err = PTR_ERR(entry); goto out; } } dir = entry->inode; memset(&fname, 0, sizeof(struct fscrypt_name)); fname.disk_name.len = le32_to_cpu(raw_inode->i_namelen); fname.disk_name.name = raw_inode->i_name; if (unlikely(fname.disk_name.len > F2FS_NAME_LEN)) { WARN_ON(1); err = -ENAMETOOLONG; goto out; } retry: de = __f2fs_find_entry(dir, &fname, &page); if (de && inode->i_ino == le32_to_cpu(de->ino)) goto out_unmap_put; if (de) { einode = f2fs_iget_retry(inode->i_sb, le32_to_cpu(de->ino)); if (IS_ERR(einode)) { WARN_ON(1); err = PTR_ERR(einode); if (err == -ENOENT) err = -EEXIST; goto out_unmap_put; } err = acquire_orphan_inode(F2FS_I_SB(inode)); if (err) { iput(einode); goto out_unmap_put; } f2fs_delete_entry(de, page, dir, einode); iput(einode); goto retry; } else if (IS_ERR(page)) { err = PTR_ERR(page); } else { err = __f2fs_do_add_link(dir, &fname, inode, inode->i_ino, inode->i_mode); } if (err == -ENOMEM) goto retry; goto out; out_unmap_put: f2fs_dentry_kunmap(dir, page); f2fs_put_page(page, 0); out: if (file_enc_name(inode)) name = "<encrypted>"; else name = raw_inode->i_name; f2fs_msg(inode->i_sb, KERN_NOTICE, "%s: ino = %x, name = %s, dir = %lx, err = %d", __func__, ino_of_node(ipage), name, IS_ERR(dir) ? 0 : dir->i_ino, err); return err; } static void recover_inode(struct inode *inode, struct page *page) { struct f2fs_inode *raw = F2FS_INODE(page); char *name; inode->i_mode = le16_to_cpu(raw->i_mode); f2fs_i_size_write(inode, le64_to_cpu(raw->i_size)); inode->i_atime.tv_sec = le64_to_cpu(raw->i_atime); inode->i_ctime.tv_sec = le64_to_cpu(raw->i_ctime); inode->i_mtime.tv_sec = le64_to_cpu(raw->i_mtime); inode->i_atime.tv_nsec = le32_to_cpu(raw->i_atime_nsec); inode->i_ctime.tv_nsec = le32_to_cpu(raw->i_ctime_nsec); inode->i_mtime.tv_nsec = le32_to_cpu(raw->i_mtime_nsec); F2FS_I(inode)->i_advise = raw->i_advise; if (file_enc_name(inode)) name = "<encrypted>"; else name = F2FS_INODE(page)->i_name; f2fs_msg(inode->i_sb, KERN_NOTICE, "recover_inode: ino = %x, name = %s", ino_of_node(page), name); } static int find_fsync_dnodes(struct f2fs_sb_info *sbi, struct list_head *head) { struct curseg_info *curseg; struct page *page = NULL; block_t blkaddr; int err = 0; /* get node pages in the current segment */ curseg = CURSEG_I(sbi, CURSEG_WARM_NODE); blkaddr = NEXT_FREE_BLKADDR(sbi, curseg); while (1) { struct fsync_inode_entry *entry; if (!is_valid_blkaddr(sbi, blkaddr, META_POR)) return 0; page = get_tmp_page(sbi, blkaddr); if (!is_recoverable_dnode(page)) break; if (!is_fsync_dnode(page)) goto next; entry = get_fsync_inode(head, ino_of_node(page)); if (!entry) { if (IS_INODE(page) && is_dent_dnode(page)) { err = recover_inode_page(sbi, page); if (err) break; } /* * CP | dnode(F) | inode(DF) * For this case, we should not give up now. */ entry = add_fsync_inode(sbi, head, ino_of_node(page)); if (IS_ERR(entry)) { err = PTR_ERR(entry); if (err == -ENOENT) { err = 0; goto next; } break; } } entry->blkaddr = blkaddr; if (IS_INODE(page) && is_dent_dnode(page)) entry->last_dentry = blkaddr; next: /* check next segment */ blkaddr = next_blkaddr_of_node(page); f2fs_put_page(page, 1); ra_meta_pages_cond(sbi, blkaddr); } f2fs_put_page(page, 1); return err; } static void destroy_fsync_dnodes(struct list_head *head) { struct fsync_inode_entry *entry, *tmp; list_for_each_entry_safe(entry, tmp, head, list) del_fsync_inode(entry); } static int check_index_in_prev_nodes(struct f2fs_sb_info *sbi, block_t blkaddr, struct dnode_of_data *dn) { struct seg_entry *sentry; unsigned int segno = GET_SEGNO(sbi, blkaddr); unsigned short blkoff = GET_BLKOFF_FROM_SEG0(sbi, blkaddr); struct f2fs_summary_block *sum_node; struct f2fs_summary sum; struct page *sum_page, *node_page; struct dnode_of_data tdn = *dn; nid_t ino, nid; struct inode *inode; unsigned int offset; block_t bidx; int i; sentry = get_seg_entry(sbi, segno); if (!f2fs_test_bit(blkoff, sentry->cur_valid_map)) return 0; /* 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]; goto got_it; } } sum_page = get_sum_page(sbi, segno); sum_node = (struct f2fs_summary_block *)page_address(sum_page); sum = sum_node->entries[blkoff]; f2fs_put_page(sum_page, 1); got_it: /* Use the locked dnode page and inode */ nid = le32_to_cpu(sum.nid); if (dn->inode->i_ino == nid) { tdn.nid = nid; if (!dn->inode_page_locked) lock_page(dn->inode_page); tdn.node_page = dn->inode_page; tdn.ofs_in_node = le16_to_cpu(sum.ofs_in_node); goto truncate_out; } else if (dn->nid == nid) { tdn.ofs_in_node = le16_to_cpu(sum.ofs_in_node); goto truncate_out; } /* Get the node page */ node_page = get_node_page(sbi, nid); if (IS_ERR(node_page)) return PTR_ERR(node_page); offset = ofs_of_node(node_page); ino = ino_of_node(node_page); f2fs_put_page(node_page, 1); if (ino != dn->inode->i_ino) { /* Deallocate previous index in the node page */ inode = f2fs_iget_retry(sbi->sb, ino); if (IS_ERR(inode)) return PTR_ERR(inode); } else { inode = dn->inode; } bidx = start_bidx_of_node(offset, inode) + le16_to_cpu(sum.ofs_in_node); /* * if inode page is locked, unlock temporarily, but its reference * count keeps alive. */ if (ino == dn->inode->i_ino && dn->inode_page_locked) unlock_page(dn->inode_page); set_new_dnode(&tdn, inode, NULL, NULL, 0); if (get_dnode_of_data(&tdn, bidx, LOOKUP_NODE)) goto out; if (tdn.data_blkaddr == blkaddr) truncate_data_blocks_range(&tdn, 1); f2fs_put_dnode(&tdn); out: if (ino != dn->inode->i_ino) iput(inode); else if (dn->inode_page_locked) lock_page(dn->inode_page); return 0; truncate_out: if (datablock_addr(tdn.node_page, tdn.ofs_in_node) == blkaddr) truncate_data_blocks_range(&tdn, 1); if (dn->inode->i_ino == nid && !dn->inode_page_locked) unlock_page(dn->inode_page); return 0; } static int do_recover_data(struct f2fs_sb_info *sbi, struct inode *inode, struct page *page, block_t blkaddr) { struct dnode_of_data dn; struct node_info ni; unsigned int start, end; int err = 0, recovered = 0; /* step 1: recover xattr */ if (IS_INODE(page)) { recover_inline_xattr(inode, page); } else if (f2fs_has_xattr_block(ofs_of_node(page))) { /* * Deprecated; xattr blocks should be found from cold log. * But, we should remain this for backward compatibility. */ recover_xattr_data(inode, page, blkaddr); goto out; } /* step 2: recover inline data */ if (recover_inline_data(inode, page)) goto out; /* step 3: recover data indices */ start = start_bidx_of_node(ofs_of_node(page), inode); end = start + ADDRS_PER_PAGE(page, inode); set_new_dnode(&dn, inode, NULL, NULL, 0); retry_dn: err = get_dnode_of_data(&dn, start, ALLOC_NODE); if (err) { if (err == -ENOMEM) { congestion_wait(BLK_RW_ASYNC, HZ/50); goto retry_dn; } goto out; } f2fs_wait_on_page_writeback(dn.node_page, NODE, true); get_node_info(sbi, dn.nid, &ni); f2fs_bug_on(sbi, ni.ino != ino_of_node(page)); f2fs_bug_on(sbi, ofs_of_node(dn.node_page) != ofs_of_node(page)); for (; start < end; start++, dn.ofs_in_node++) { block_t src, dest; src = datablock_addr(dn.node_page, dn.ofs_in_node); dest = datablock_addr(page, dn.ofs_in_node); /* skip recovering if dest is the same as src */ if (src == dest) continue; /* dest is invalid, just invalidate src block */ if (dest == NULL_ADDR) { truncate_data_blocks_range(&dn, 1); continue; } if (!file_keep_isize(inode) && (i_size_read(inode) <= (start << PAGE_SHIFT))) f2fs_i_size_write(inode, (start + 1) << PAGE_SHIFT); /* * dest is reserved block, invalidate src block * and then reserve one new block in dnode page. */ if (dest == NEW_ADDR) { truncate_data_blocks_range(&dn, 1); reserve_new_block(&dn); continue; } /* dest is valid block, try to recover from src to dest */ if (is_valid_blkaddr(sbi, dest, META_POR)) { if (src == NULL_ADDR) { err = reserve_new_block(&dn); #ifdef CONFIG_F2FS_FAULT_INJECTION while (err) err = reserve_new_block(&dn); #endif /* We should not get -ENOSPC */ f2fs_bug_on(sbi, err); if (err) goto err; } retry_prev: /* Check the previous node page having this index */ err = check_index_in_prev_nodes(sbi, dest, &dn); if (err) { if (err == -ENOMEM) { congestion_wait(BLK_RW_ASYNC, HZ/50); goto retry_prev; } goto err; } /* write dummy data page */ f2fs_replace_block(sbi, &dn, src, dest, ni.version, false, false); recovered++; } } 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); err: f2fs_put_dnode(&dn); out: f2fs_msg(sbi->sb, KERN_NOTICE, "recover_data: ino = %lx (i_size: %s) recovered = %d, err = %d", inode->i_ino, file_keep_isize(inode) ? "keep" : "recover", recovered, err); return err; } static int recover_data(struct f2fs_sb_info *sbi, struct list_head *inode_list, struct list_head *dir_list) { struct curseg_info *curseg; struct page *page = NULL; int err = 0; block_t blkaddr; /* get node pages in the current segment */ curseg = CURSEG_I(sbi, CURSEG_WARM_NODE); blkaddr = NEXT_FREE_BLKADDR(sbi, curseg); while (1) { struct fsync_inode_entry *entry; if (!is_valid_blkaddr(sbi, blkaddr, META_POR)) break; ra_meta_pages_cond(sbi, blkaddr); page = get_tmp_page(sbi, blkaddr); if (!is_recoverable_dnode(page)) { f2fs_put_page(page, 1); break; } entry = get_fsync_inode(inode_list, ino_of_node(page)); if (!entry) goto next; /* * inode(x) | CP | inode(x) | dnode(F) * In this case, we can lose the latest inode(x). * So, call recover_inode for the inode update. */ if (IS_INODE(page)) recover_inode(entry->inode, page); if (entry->last_dentry == blkaddr) { err = recover_dentry(entry->inode, page, dir_list); if (err) { f2fs_put_page(page, 1); break; } } err = do_recover_data(sbi, entry->inode, page, blkaddr); if (err) { f2fs_put_page(page, 1); break; } if (entry->blkaddr == blkaddr) del_fsync_inode(entry); next: /* check next segment */ blkaddr = next_blkaddr_of_node(page); f2fs_put_page(page, 1); } if (!err) allocate_new_segments(sbi); return err; } int recover_fsync_data(struct f2fs_sb_info *sbi, bool check_only) { struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_WARM_NODE); struct list_head inode_list; struct list_head dir_list; block_t blkaddr; int err; int ret = 0; bool need_writecp = false; fsync_entry_slab = f2fs_kmem_cache_create("f2fs_fsync_inode_entry", sizeof(struct fsync_inode_entry)); if (!fsync_entry_slab) return -ENOMEM; INIT_LIST_HEAD(&inode_list); INIT_LIST_HEAD(&dir_list); /* prevent checkpoint */ mutex_lock(&sbi->cp_mutex); blkaddr = NEXT_FREE_BLKADDR(sbi, curseg); /* step #1: find fsynced inode numbers */ err = find_fsync_dnodes(sbi, &inode_list); if (err || list_empty(&inode_list)) goto out; if (check_only) { ret = 1; goto out; } need_writecp = true; /* step #2: recover data */ err = recover_data(sbi, &inode_list, &dir_list); if (!err) f2fs_bug_on(sbi, !list_empty(&inode_list)); out: destroy_fsync_dnodes(&inode_list); /* truncate meta pages to be used by the recovery */ truncate_inode_pages_range(META_MAPPING(sbi), (loff_t)MAIN_BLKADDR(sbi) << PAGE_SHIFT, -1); if (err) { truncate_inode_pages_final(NODE_MAPPING(sbi)); truncate_inode_pages_final(META_MAPPING(sbi)); } clear_sbi_flag(sbi, SBI_POR_DOING); if (err) set_ckpt_flags(sbi, CP_ERROR_FLAG); mutex_unlock(&sbi->cp_mutex); /* let's drop all the directory inodes for clean checkpoint */ destroy_fsync_dnodes(&dir_list); if (!err && need_writecp) { struct cp_control cpc = { .reason = CP_RECOVERY, }; err = write_checkpoint(sbi, &cpc); } kmem_cache_destroy(fsync_entry_slab); return ret ? ret: err; }