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![Chao Yu](/assets/img/avatar_default.png)
There is no checksum in node block now, so bit-transition from hardware can make node_footer.next_blkaddr being corrupted w/o any detection, result in node chain becoming looped one. For this condition, during recovery, in order to avoid running into dead loop, let's detect it and just skip out. Signed-off-by: Yunlei He <heyunlei@huawei.com> Signed-off-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
707 lines
16 KiB
C
707 lines
16 KiB
C
/*
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* fs/f2fs/recovery.c
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*
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* Copyright (c) 2012 Samsung Electronics Co., Ltd.
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* http://www.samsung.com/
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/fs.h>
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#include <linux/f2fs_fs.h>
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#include "f2fs.h"
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#include "node.h"
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#include "segment.h"
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/*
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* Roll forward recovery scenarios.
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*
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* [Term] F: fsync_mark, D: dentry_mark
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*
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* 1. inode(x) | CP | inode(x) | dnode(F)
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* -> Update the latest inode(x).
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*
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* 2. inode(x) | CP | inode(F) | dnode(F)
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* -> No problem.
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*
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* 3. inode(x) | CP | dnode(F) | inode(x)
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* -> Recover to the latest dnode(F), and drop the last inode(x)
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*
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* 4. inode(x) | CP | dnode(F) | inode(F)
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* -> No problem.
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*
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* 5. CP | inode(x) | dnode(F)
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* -> The inode(DF) was missing. Should drop this dnode(F).
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*
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* 6. CP | inode(DF) | dnode(F)
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* -> No problem.
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*
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* 7. CP | dnode(F) | inode(DF)
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* -> If f2fs_iget fails, then goto next to find inode(DF).
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*
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* 8. CP | dnode(F) | inode(x)
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* -> If f2fs_iget fails, then goto next to find inode(DF).
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* But it will fail due to no inode(DF).
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*/
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static struct kmem_cache *fsync_entry_slab;
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bool space_for_roll_forward(struct f2fs_sb_info *sbi)
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{
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s64 nalloc = percpu_counter_sum_positive(&sbi->alloc_valid_block_count);
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if (sbi->last_valid_block_count + nalloc > sbi->user_block_count)
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return false;
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return true;
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}
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static struct fsync_inode_entry *get_fsync_inode(struct list_head *head,
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nid_t ino)
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{
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struct fsync_inode_entry *entry;
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list_for_each_entry(entry, head, list)
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if (entry->inode->i_ino == ino)
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return entry;
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return NULL;
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}
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static struct fsync_inode_entry *add_fsync_inode(struct f2fs_sb_info *sbi,
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struct list_head *head, nid_t ino, bool quota_inode)
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{
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struct inode *inode;
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struct fsync_inode_entry *entry;
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int err;
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inode = f2fs_iget_retry(sbi->sb, ino);
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if (IS_ERR(inode))
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return ERR_CAST(inode);
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err = dquot_initialize(inode);
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if (err)
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goto err_out;
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if (quota_inode) {
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err = dquot_alloc_inode(inode);
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if (err)
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goto err_out;
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}
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entry = f2fs_kmem_cache_alloc(fsync_entry_slab, GFP_F2FS_ZERO);
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entry->inode = inode;
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list_add_tail(&entry->list, head);
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return entry;
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err_out:
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iput(inode);
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return ERR_PTR(err);
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}
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static void del_fsync_inode(struct fsync_inode_entry *entry)
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{
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iput(entry->inode);
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list_del(&entry->list);
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kmem_cache_free(fsync_entry_slab, entry);
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}
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static int recover_dentry(struct inode *inode, struct page *ipage,
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struct list_head *dir_list)
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{
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struct f2fs_inode *raw_inode = F2FS_INODE(ipage);
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nid_t pino = le32_to_cpu(raw_inode->i_pino);
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struct f2fs_dir_entry *de;
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struct fscrypt_name fname;
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struct page *page;
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struct inode *dir, *einode;
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struct fsync_inode_entry *entry;
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int err = 0;
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char *name;
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entry = get_fsync_inode(dir_list, pino);
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if (!entry) {
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entry = add_fsync_inode(F2FS_I_SB(inode), dir_list,
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pino, false);
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if (IS_ERR(entry)) {
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dir = ERR_CAST(entry);
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err = PTR_ERR(entry);
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goto out;
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}
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}
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dir = entry->inode;
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memset(&fname, 0, sizeof(struct fscrypt_name));
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fname.disk_name.len = le32_to_cpu(raw_inode->i_namelen);
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fname.disk_name.name = raw_inode->i_name;
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if (unlikely(fname.disk_name.len > F2FS_NAME_LEN)) {
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WARN_ON(1);
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err = -ENAMETOOLONG;
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goto out;
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}
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retry:
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de = __f2fs_find_entry(dir, &fname, &page);
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if (de && inode->i_ino == le32_to_cpu(de->ino))
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goto out_put;
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if (de) {
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einode = f2fs_iget_retry(inode->i_sb, le32_to_cpu(de->ino));
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if (IS_ERR(einode)) {
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WARN_ON(1);
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err = PTR_ERR(einode);
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if (err == -ENOENT)
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err = -EEXIST;
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goto out_put;
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}
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err = dquot_initialize(einode);
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if (err) {
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iput(einode);
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goto out_put;
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}
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err = acquire_orphan_inode(F2FS_I_SB(inode));
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if (err) {
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iput(einode);
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goto out_put;
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}
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f2fs_delete_entry(de, page, dir, einode);
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iput(einode);
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goto retry;
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} else if (IS_ERR(page)) {
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err = PTR_ERR(page);
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} else {
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err = __f2fs_do_add_link(dir, &fname, inode,
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inode->i_ino, inode->i_mode);
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}
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if (err == -ENOMEM)
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goto retry;
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goto out;
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out_put:
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f2fs_put_page(page, 0);
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out:
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if (file_enc_name(inode))
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name = "<encrypted>";
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else
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name = raw_inode->i_name;
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f2fs_msg(inode->i_sb, KERN_NOTICE,
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"%s: ino = %x, name = %s, dir = %lx, err = %d",
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__func__, ino_of_node(ipage), name,
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IS_ERR(dir) ? 0 : dir->i_ino, err);
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return err;
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}
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static void recover_inline_flags(struct inode *inode, struct f2fs_inode *ri)
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{
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if (ri->i_inline & F2FS_PIN_FILE)
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set_inode_flag(inode, FI_PIN_FILE);
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else
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clear_inode_flag(inode, FI_PIN_FILE);
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if (ri->i_inline & F2FS_DATA_EXIST)
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set_inode_flag(inode, FI_DATA_EXIST);
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else
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clear_inode_flag(inode, FI_DATA_EXIST);
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if (!(ri->i_inline & F2FS_INLINE_DOTS))
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clear_inode_flag(inode, FI_INLINE_DOTS);
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}
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static void recover_inode(struct inode *inode, struct page *page)
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{
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struct f2fs_inode *raw = F2FS_INODE(page);
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char *name;
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inode->i_mode = le16_to_cpu(raw->i_mode);
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f2fs_i_size_write(inode, le64_to_cpu(raw->i_size));
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inode->i_atime.tv_sec = le64_to_cpu(raw->i_atime);
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inode->i_ctime.tv_sec = le64_to_cpu(raw->i_ctime);
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inode->i_mtime.tv_sec = le64_to_cpu(raw->i_mtime);
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inode->i_atime.tv_nsec = le32_to_cpu(raw->i_atime_nsec);
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inode->i_ctime.tv_nsec = le32_to_cpu(raw->i_ctime_nsec);
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inode->i_mtime.tv_nsec = le32_to_cpu(raw->i_mtime_nsec);
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F2FS_I(inode)->i_advise = raw->i_advise;
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recover_inline_flags(inode, raw);
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if (file_enc_name(inode))
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name = "<encrypted>";
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else
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name = F2FS_INODE(page)->i_name;
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f2fs_msg(inode->i_sb, KERN_NOTICE,
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"recover_inode: ino = %x, name = %s, inline = %x",
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ino_of_node(page), name, raw->i_inline);
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}
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static int find_fsync_dnodes(struct f2fs_sb_info *sbi, struct list_head *head,
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bool check_only)
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{
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struct curseg_info *curseg;
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struct page *page = NULL;
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block_t blkaddr;
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unsigned int loop_cnt = 0;
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unsigned int free_blocks = sbi->user_block_count -
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valid_user_blocks(sbi);
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int err = 0;
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/* get node pages in the current segment */
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curseg = CURSEG_I(sbi, CURSEG_WARM_NODE);
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blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
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while (1) {
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struct fsync_inode_entry *entry;
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if (!is_valid_blkaddr(sbi, blkaddr, META_POR))
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return 0;
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page = get_tmp_page(sbi, blkaddr);
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if (!is_recoverable_dnode(page))
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break;
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if (!is_fsync_dnode(page))
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goto next;
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entry = get_fsync_inode(head, ino_of_node(page));
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if (!entry) {
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bool quota_inode = false;
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if (!check_only &&
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IS_INODE(page) && is_dent_dnode(page)) {
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err = recover_inode_page(sbi, page);
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if (err)
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break;
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quota_inode = true;
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}
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/*
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* CP | dnode(F) | inode(DF)
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* For this case, we should not give up now.
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*/
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entry = add_fsync_inode(sbi, head, ino_of_node(page),
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quota_inode);
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if (IS_ERR(entry)) {
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err = PTR_ERR(entry);
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if (err == -ENOENT) {
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err = 0;
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goto next;
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}
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break;
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}
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}
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entry->blkaddr = blkaddr;
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if (IS_INODE(page) && is_dent_dnode(page))
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entry->last_dentry = blkaddr;
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next:
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/* sanity check in order to detect looped node chain */
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if (++loop_cnt >= free_blocks ||
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blkaddr == next_blkaddr_of_node(page)) {
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f2fs_msg(sbi->sb, KERN_NOTICE,
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"%s: detect looped node chain, "
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"blkaddr:%u, next:%u",
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__func__, blkaddr, next_blkaddr_of_node(page));
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err = -EINVAL;
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break;
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}
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/* check next segment */
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blkaddr = next_blkaddr_of_node(page);
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f2fs_put_page(page, 1);
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ra_meta_pages_cond(sbi, blkaddr);
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}
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f2fs_put_page(page, 1);
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return err;
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}
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static void destroy_fsync_dnodes(struct list_head *head)
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{
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struct fsync_inode_entry *entry, *tmp;
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list_for_each_entry_safe(entry, tmp, head, list)
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del_fsync_inode(entry);
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}
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static int check_index_in_prev_nodes(struct f2fs_sb_info *sbi,
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block_t blkaddr, struct dnode_of_data *dn)
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{
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struct seg_entry *sentry;
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unsigned int segno = GET_SEGNO(sbi, blkaddr);
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unsigned short blkoff = GET_BLKOFF_FROM_SEG0(sbi, blkaddr);
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struct f2fs_summary_block *sum_node;
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struct f2fs_summary sum;
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struct page *sum_page, *node_page;
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struct dnode_of_data tdn = *dn;
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nid_t ino, nid;
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struct inode *inode;
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unsigned int offset;
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block_t bidx;
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int i;
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sentry = get_seg_entry(sbi, segno);
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if (!f2fs_test_bit(blkoff, sentry->cur_valid_map))
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return 0;
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/* Get the previous summary */
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for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_DATA; i++) {
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struct curseg_info *curseg = CURSEG_I(sbi, i);
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if (curseg->segno == segno) {
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sum = curseg->sum_blk->entries[blkoff];
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goto got_it;
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}
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}
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sum_page = get_sum_page(sbi, segno);
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sum_node = (struct f2fs_summary_block *)page_address(sum_page);
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sum = sum_node->entries[blkoff];
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f2fs_put_page(sum_page, 1);
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got_it:
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/* Use the locked dnode page and inode */
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nid = le32_to_cpu(sum.nid);
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if (dn->inode->i_ino == nid) {
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tdn.nid = nid;
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if (!dn->inode_page_locked)
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lock_page(dn->inode_page);
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tdn.node_page = dn->inode_page;
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tdn.ofs_in_node = le16_to_cpu(sum.ofs_in_node);
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goto truncate_out;
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} else if (dn->nid == nid) {
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tdn.ofs_in_node = le16_to_cpu(sum.ofs_in_node);
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goto truncate_out;
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}
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/* Get the node page */
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node_page = get_node_page(sbi, nid);
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if (IS_ERR(node_page))
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return PTR_ERR(node_page);
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offset = ofs_of_node(node_page);
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ino = ino_of_node(node_page);
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f2fs_put_page(node_page, 1);
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if (ino != dn->inode->i_ino) {
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int ret;
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/* Deallocate previous index in the node page */
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inode = f2fs_iget_retry(sbi->sb, ino);
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if (IS_ERR(inode))
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return PTR_ERR(inode);
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ret = dquot_initialize(inode);
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if (ret) {
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iput(inode);
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return ret;
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}
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} else {
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inode = dn->inode;
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}
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bidx = start_bidx_of_node(offset, inode) + le16_to_cpu(sum.ofs_in_node);
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/*
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* if inode page is locked, unlock temporarily, but its reference
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* count keeps alive.
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*/
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if (ino == dn->inode->i_ino && dn->inode_page_locked)
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unlock_page(dn->inode_page);
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set_new_dnode(&tdn, inode, NULL, NULL, 0);
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if (get_dnode_of_data(&tdn, bidx, LOOKUP_NODE))
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goto out;
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if (tdn.data_blkaddr == blkaddr)
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truncate_data_blocks_range(&tdn, 1);
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f2fs_put_dnode(&tdn);
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out:
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if (ino != dn->inode->i_ino)
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iput(inode);
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else if (dn->inode_page_locked)
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lock_page(dn->inode_page);
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return 0;
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truncate_out:
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if (datablock_addr(tdn.inode, tdn.node_page,
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tdn.ofs_in_node) == blkaddr)
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truncate_data_blocks_range(&tdn, 1);
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if (dn->inode->i_ino == nid && !dn->inode_page_locked)
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unlock_page(dn->inode_page);
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return 0;
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}
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static int do_recover_data(struct f2fs_sb_info *sbi, struct inode *inode,
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struct page *page)
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{
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struct dnode_of_data dn;
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struct node_info ni;
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unsigned int start, end;
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int err = 0, recovered = 0;
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/* step 1: recover xattr */
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if (IS_INODE(page)) {
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recover_inline_xattr(inode, page);
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} else if (f2fs_has_xattr_block(ofs_of_node(page))) {
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err = recover_xattr_data(inode, page);
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if (!err)
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recovered++;
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goto out;
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}
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/* step 2: recover inline data */
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if (recover_inline_data(inode, page))
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goto out;
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/* step 3: recover data indices */
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start = start_bidx_of_node(ofs_of_node(page), inode);
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end = start + ADDRS_PER_PAGE(page, inode);
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set_new_dnode(&dn, inode, NULL, NULL, 0);
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retry_dn:
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err = get_dnode_of_data(&dn, start, ALLOC_NODE);
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if (err) {
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if (err == -ENOMEM) {
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congestion_wait(BLK_RW_ASYNC, HZ/50);
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goto retry_dn;
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}
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goto out;
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}
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f2fs_wait_on_page_writeback(dn.node_page, NODE, true);
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get_node_info(sbi, dn.nid, &ni);
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f2fs_bug_on(sbi, ni.ino != ino_of_node(page));
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f2fs_bug_on(sbi, ofs_of_node(dn.node_page) != ofs_of_node(page));
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for (; start < end; start++, dn.ofs_in_node++) {
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block_t src, dest;
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src = datablock_addr(dn.inode, dn.node_page, dn.ofs_in_node);
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dest = datablock_addr(dn.inode, page, dn.ofs_in_node);
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|
|
/* 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) <= ((loff_t)start << PAGE_SHIFT)))
|
|
f2fs_i_size_write(inode,
|
|
(loff_t)(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);
|
|
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 list_head inode_list;
|
|
struct list_head dir_list;
|
|
int err;
|
|
int ret = 0;
|
|
unsigned long s_flags = sbi->sb->s_flags;
|
|
bool need_writecp = false;
|
|
#ifdef CONFIG_QUOTA
|
|
int quota_enabled;
|
|
#endif
|
|
|
|
if (s_flags & SB_RDONLY) {
|
|
f2fs_msg(sbi->sb, KERN_INFO, "orphan cleanup on readonly fs");
|
|
sbi->sb->s_flags &= ~SB_RDONLY;
|
|
}
|
|
|
|
#ifdef CONFIG_QUOTA
|
|
/* Needed for iput() to work correctly and not trash data */
|
|
sbi->sb->s_flags |= SB_ACTIVE;
|
|
/* Turn on quotas so that they are updated correctly */
|
|
quota_enabled = f2fs_enable_quota_files(sbi, s_flags & SB_RDONLY);
|
|
#endif
|
|
|
|
fsync_entry_slab = f2fs_kmem_cache_create("f2fs_fsync_inode_entry",
|
|
sizeof(struct fsync_inode_entry));
|
|
if (!fsync_entry_slab) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
INIT_LIST_HEAD(&inode_list);
|
|
INIT_LIST_HEAD(&dir_list);
|
|
|
|
/* prevent checkpoint */
|
|
mutex_lock(&sbi->cp_mutex);
|
|
|
|
/* step #1: find fsynced inode numbers */
|
|
err = find_fsync_dnodes(sbi, &inode_list, check_only);
|
|
if (err || list_empty(&inode_list))
|
|
goto skip;
|
|
|
|
if (check_only) {
|
|
ret = 1;
|
|
goto skip;
|
|
}
|
|
|
|
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));
|
|
skip:
|
|
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);
|
|
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);
|
|
out:
|
|
#ifdef CONFIG_QUOTA
|
|
/* Turn quotas off */
|
|
if (quota_enabled)
|
|
f2fs_quota_off_umount(sbi->sb);
|
|
#endif
|
|
sbi->sb->s_flags = s_flags; /* Restore SB_RDONLY status */
|
|
|
|
return ret ? ret: err;
|
|
}
|