1 files changed, 575 insertions, 0 deletions

diff --git a/kernel/fs/f2fs/recovery.c b/kernel/fs/f2fs/recovery.c
new file mode 100644
index 000000000..8d8ea99f2
--- /dev/null
+++ b/kernel/fs/f2fs/recovery.c
@@ -0,0 +1,575 @@
+/*
+ * 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)
+{
+	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 inode *inode, struct page *ipage)
+{
+	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_I_SB(inode));
+		if (err) {
+			iput(einode);
+			goto out_unmap_put;
+		}
+		f2fs_delete_entry(de, page, dir, einode);
+		iput(einode);
+		goto retry;
+	}
+	err = __f2fs_add_link(dir, &name, inode, inode->i_ino, inode->i_mode);
+	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:
+	f2fs_dentry_kunmap(dir, 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 void recover_inode(struct inode *inode, struct page *page)
+{
+	struct f2fs_inode *raw = F2FS_INODE(page);
+
+	inode->i_mode = le16_to_cpu(raw->i_mode);
+	i_size_write(inode, le64_to_cpu(raw->i_size));
+	inode->i_atime.tv_sec = le64_to_cpu(raw->i_mtime);
+	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_mtime_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_msg(inode->i_sb, KERN_NOTICE, "recover_inode: ino = %x, name = %s",
+			ino_of_node(page), F2FS_INODE(page)->i_name);
+}
+
+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 = 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);
+
+	ra_meta_pages(sbi, blkaddr, 1, META_POR);
+
+	while (1) {
+		struct fsync_inode_entry *entry;
+
+		if (blkaddr < MAIN_BLKADDR(sbi) || blkaddr >= MAX_BLKADDR(sbi))
+			return 0;
+
+		page = get_meta_page(sbi, blkaddr);
+
+		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)) {
+				err = recover_inode_page(sbi, page);
+				if (err)
+					break;
+			}
+
+			/* add this fsync inode to the list */
+			entry = kmem_cache_alloc(fsync_entry_slab, GFP_F2FS_ZERO);
+			if (!entry) {
+				err = -ENOMEM;
+				break;
+			}
+			/*
+			 * CP | dnode(F) | inode(DF)
+			 * For this case, we should not give up now.
+			 */
+			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);
+				if (err == -ENOENT) {
+					err = 0;
+					goto next;
+				}
+				break;
+			}
+			list_add_tail(&entry->list, head);
+		}
+		entry->blkaddr = blkaddr;
+
+		if (IS_INODE(page)) {
+			entry->last_inode = blkaddr;
+			if (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) {
+		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;
+	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(sbi->sb, ino);
+		if (IS_ERR(inode))
+			return PTR_ERR(inode);
+	} else {
+		inode = dn->inode;
+	}
+
+	bidx = start_bidx_of_node(offset, F2FS_I(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 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;
+
+	/* 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), 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(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++) {
+		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 &&
+			dest >= MAIN_BLKADDR(sbi) && dest < MAX_BLKADDR(sbi)) {
+
+			if (src == NULL_ADDR) {
+				err = reserve_new_block(&dn);
+				/* We should not get -ENOSPC */
+				f2fs_bug_on(sbi, 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);
+			dn.data_blkaddr = dest;
+			set_data_blkaddr(&dn);
+			f2fs_update_extent_cache(&dn);
+			recovered++;
+		}
+		dn.ofs_in_node++;
+	}
+
+	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);
+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 = NULL;
+	int err = 0;
+	block_t blkaddr;
+
+	/* get node pages in the current segment */
+	curseg = CURSEG_I(sbi, type);
+	blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
+
+	while (1) {
+		struct fsync_inode_entry *entry;
+
+		if (blkaddr < MAIN_BLKADDR(sbi) || blkaddr >= MAX_BLKADDR(sbi))
+			break;
+
+		ra_meta_pages_cond(sbi, blkaddr);
+
+		page = get_meta_page(sbi, blkaddr);
+
+		if (cp_ver != cpver_of_node(page)) {
+			f2fs_put_page(page, 1);
+			break;
+		}
+
+		entry = get_fsync_inode(head, 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 (entry->last_inode == blkaddr)
+			recover_inode(entry->inode, page);
+		if (entry->last_dentry == blkaddr) {
+			err = recover_dentry(entry->inode, page);
+			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) {
+			iput(entry->inode);
+			list_del(&entry->list);
+			kmem_cache_free(fsync_entry_slab, 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)
+{
+	struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_WARM_NODE);
+	struct list_head inode_list;
+	block_t blkaddr;
+	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 */
+	set_sbi_flag(sbi, SBI_POR_DOING);
+
+	/* prevent checkpoint */
+	mutex_lock(&sbi->cp_mutex);
+
+	blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
+
+	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);
+	if (!err)
+		f2fs_bug_on(sbi, !list_empty(&inode_list));
+out:
+	destroy_fsync_dnodes(&inode_list);
+	kmem_cache_destroy(fsync_entry_slab);
+
+	/* truncate meta pages to be used by the recovery */
+	truncate_inode_pages_range(META_MAPPING(sbi),
+			MAIN_BLKADDR(sbi) << PAGE_CACHE_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) {
+		discard_next_dnode(sbi, blkaddr);
+
+		/* Flush all the NAT/SIT pages */
+		while (get_pages(sbi, F2FS_DIRTY_META))
+			sync_meta_pages(sbi, META, LONG_MAX);
+		set_ckpt_flags(sbi->ckpt, CP_ERROR_FLAG);
+		mutex_unlock(&sbi->cp_mutex);
+	} else if (need_writecp) {
+		struct cp_control cpc = {
+			.reason = CP_RECOVERY,
+		};
+		mutex_unlock(&sbi->cp_mutex);
+		write_checkpoint(sbi, &cpc);
+	} else {
+		mutex_unlock(&sbi->cp_mutex);
+	}
+	return err;
+}