diff options
Diffstat (limited to 'fs/f2fs/recovery.c')
| -rw-r--r-- | fs/f2fs/recovery.c | 469 |
1 files changed, 469 insertions, 0 deletions
diff --git a/fs/f2fs/recovery.c b/fs/f2fs/recovery.c new file mode 100644 index 00000000000..a112368a4a8 --- /dev/null +++ b/fs/f2fs/recovery.c @@ -0,0 +1,469 @@ +/* + * 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 fsync_inode_entry *entry; + + list_for_each_entry(entry, head, list) + if (entry->inode->i_ino == ino) + return entry; + + return NULL; +} + +static int recover_dentry(struct page *ipage, struct inode *inode) +{ + struct f2fs_inode *raw_inode = F2FS_INODE(ipage); + nid_t pino = le32_to_cpu(raw_inode->i_pino); + struct f2fs_dir_entry *de; + struct qstr name; + struct page *page; + struct inode *dir, *einode; + int err = 0; + + dir = f2fs_iget(inode->i_sb, pino); + if (IS_ERR(dir)) { + err = PTR_ERR(dir); + goto out; + } + + name.len = le32_to_cpu(raw_inode->i_namelen); + name.name = raw_inode->i_name; + + if (unlikely(name.len > F2FS_NAME_LEN)) { + WARN_ON(1); + err = -ENAMETOOLONG; + goto out_err; + } +retry: + de = f2fs_find_entry(dir, &name, &page); + if (de && inode->i_ino == le32_to_cpu(de->ino)) + goto out_unmap_put; + if (de) { + einode = f2fs_iget(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_SB(inode->i_sb)); + if (err) { + iput(einode); + goto out_unmap_put; + } + f2fs_delete_entry(de, page, einode); + iput(einode); + goto retry; + } + err = __f2fs_add_link(dir, &name, inode); + if (err) + goto out_err; + + if (is_inode_flag_set(F2FS_I(dir), FI_DELAY_IPUT)) { + iput(dir); + } else { + add_dirty_dir_inode(dir); + set_inode_flag(F2FS_I(dir), FI_DELAY_IPUT); + } + + goto out; + +out_unmap_put: + kunmap(page); + f2fs_put_page(page, 0); +out_err: + iput(dir); +out: + f2fs_msg(inode->i_sb, KERN_NOTICE, + "%s: ino = %x, name = %s, dir = %lx, err = %d", + __func__, ino_of_node(ipage), raw_inode->i_name, + IS_ERR(dir) ? 0 : dir->i_ino, err); + return err; +} + +static int recover_inode(struct inode *inode, struct page *node_page) +{ + struct f2fs_inode *raw_inode = F2FS_INODE(node_page); + + if (!IS_INODE(node_page)) + return 0; + + 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); + + if (is_dent_dnode(node_page)) + return recover_dentry(node_page, inode); + + f2fs_msg(inode->i_sb, KERN_NOTICE, "recover_inode: ino = %x, name = %s", + ino_of_node(node_page), raw_inode->i_name); + return 0; +} + +static int find_fsync_dnodes(struct f2fs_sb_info *sbi, struct list_head *head) +{ + unsigned long long cp_ver = cur_cp_version(F2FS_CKPT(sbi)); + 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 = NEXT_FREE_BLKADDR(sbi, curseg); + + /* read node page */ + page = alloc_page(GFP_F2FS_ZERO); + if (!page) + return -ENOMEM; + lock_page(page); + + while (1) { + struct fsync_inode_entry *entry; + + err = f2fs_submit_page_bio(sbi, page, blkaddr, READ_SYNC); + if (err) + return err; + + lock_page(page); + + if (cp_ver != cpver_of_node(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)) + set_inode_flag(F2FS_I(entry->inode), + FI_INC_LINK); + } else { + if (IS_INODE(page) && is_dent_dnode(page)) { + err = recover_inode_page(sbi, page); + if (err) + break; + } + + /* add this fsync inode to the list */ + entry = kmem_cache_alloc(fsync_entry_slab, GFP_NOFS); + if (!entry) { + err = -ENOMEM; + break; + } + + 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); + break; + } + list_add_tail(&entry->list, head); + } + entry->blkaddr = blkaddr; + + err = recover_inode(entry->inode, page); + if (err && err != -ENOENT) + break; +next: + /* check next segment */ + blkaddr = next_blkaddr_of_node(page); + } + + unlock_page(page); + __free_pages(page, 0); + + 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) { + iput(entry->inode); + list_del(&entry->list); + kmem_cache_free(fsync_entry_slab, 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; + 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) { + struct dnode_of_data tdn = *dn; + tdn.nid = nid; + tdn.node_page = dn->inode_page; + tdn.ofs_in_node = le16_to_cpu(sum.ofs_in_node); + truncate_data_blocks_range(&tdn, 1); + return 0; + } else if (dn->nid == nid) { + struct dnode_of_data tdn = *dn; + tdn.ofs_in_node = le16_to_cpu(sum.ofs_in_node); + truncate_data_blocks_range(&tdn, 1); + return 0; + } + + /* 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); + + /* Deallocate previous index in the node page */ + inode = f2fs_iget(sbi->sb, ino); + if (IS_ERR(inode)) + return PTR_ERR(inode); + + bidx = start_bidx_of_node(offset, F2FS_I(inode)) + + le16_to_cpu(sum.ofs_in_node); + + truncate_hole(inode, bidx, bidx + 1); + iput(inode); + return 0; +} + +static int do_recover_data(struct f2fs_sb_info *sbi, struct inode *inode, + struct page *page, block_t blkaddr) +{ + struct f2fs_inode_info *fi = F2FS_I(inode); + unsigned int start, end; + struct dnode_of_data dn; + struct f2fs_summary sum; + struct node_info ni; + int err = 0, recovered = 0; + + if (recover_inline_data(inode, page)) + goto out; + + if (recover_xattr_data(inode, page, blkaddr)) + goto out; + + start = start_bidx_of_node(ofs_of_node(page), fi); + end = start + ADDRS_PER_PAGE(page, fi); + + f2fs_lock_op(sbi); + + set_new_dnode(&dn, inode, NULL, NULL, 0); + + err = get_dnode_of_data(&dn, start, ALLOC_NODE); + if (err) { + f2fs_unlock_op(sbi); + goto out; + } + + f2fs_wait_on_page_writeback(dn.node_page, NODE); + + get_node_info(sbi, dn.nid, &ni); + f2fs_bug_on(ni.ino != ino_of_node(page)); + f2fs_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) { + err = reserve_new_block(&dn); + /* We should not get -ENOSPC */ + f2fs_bug_on(err); + } + + /* Check the previous node page having this index */ + err = check_index_in_prev_nodes(sbi, dest, &dn); + if (err) + goto err; + + 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); + recovered++; + } + 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); +err: + f2fs_put_dnode(&dn); + f2fs_unlock_op(sbi); +out: + f2fs_msg(sbi->sb, KERN_NOTICE, + "recover_data: ino = %lx, recovered = %d blocks, err = %d", + inode->i_ino, recovered, err); + return err; +} + +static int recover_data(struct f2fs_sb_info *sbi, + struct list_head *head, int type) +{ + unsigned long long cp_ver = cur_cp_version(F2FS_CKPT(sbi)); + struct curseg_info *curseg; + struct page *page; + int err = 0; + 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_F2FS_ZERO); + if (!page) + return -ENOMEM; + + lock_page(page); + + while (1) { + struct fsync_inode_entry *entry; + + err = f2fs_submit_page_bio(sbi, page, blkaddr, READ_SYNC); + if (err) + return err; + + lock_page(page); + + if (cp_ver != cpver_of_node(page)) + break; + + entry = get_fsync_inode(head, ino_of_node(page)); + if (!entry) + goto next; + + err = do_recover_data(sbi, entry->inode, page, blkaddr); + if (err) + break; + + 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); + } + + unlock_page(page); + __free_pages(page, 0); + + if (!err) + allocate_new_segments(sbi); + return err; +} + +int recover_fsync_data(struct f2fs_sb_info *sbi) +{ + struct list_head inode_list; + int err; + 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); + + /* step #1: find fsynced inode numbers */ + sbi->por_doing = true; + err = find_fsync_dnodes(sbi, &inode_list); + if (err) + goto out; + + if (list_empty(&inode_list)) + goto out; + + need_writecp = true; + + /* step #2: recover data */ + err = recover_data(sbi, &inode_list, CURSEG_WARM_NODE); + f2fs_bug_on(!list_empty(&inode_list)); +out: + destroy_fsync_dnodes(&inode_list); + kmem_cache_destroy(fsync_entry_slab); + sbi->por_doing = false; + if (!err && need_writecp) + write_checkpoint(sbi, false); + return err; +} |