f2fs: introduce and spread verify_blkaddr

BugLink: https://bugs.launchpad.net/bugs/1818797

commit e1da7872 upstream.

This patch introduces verify_blkaddr to check meta/data block address
with valid range to detect bug earlier.

In addition, once we encounter an invalid blkaddr, notice user to run
fsck to fix, and let the kernel panic.
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
[bwh: Backported to 4.4:
 - I skipped an earlier renaming of is_valid_meta_blkaddr() to
   f2fs_is_valid_meta_blkaddr()
 - Drop inapplicable change to check on f2fs_fio_info::old_blkaddr
 - Adjust context]
Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Juerg Haefliger <juergh@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

fs/f2fs/checkpoint.c

@@ -107,7 +107,8 @@ struct page *get_tmp_page(struct f2fs_sb_info *sbi, pgoff_t index)
 	return __get_meta_page(sbi, index, false);
 }
 
-bool is_valid_meta_blkaddr(struct f2fs_sb_info *sbi, block_t blkaddr, int type)
+bool f2fs_is_valid_blkaddr(struct f2fs_sb_info *sbi,
+					block_t blkaddr, int type)
 {
 	switch (type) {
 	case META_NAT:
@@ -127,10 +128,16 @@ bool is_valid_meta_blkaddr(struct f2fs_sb_info *sbi, block_t blkaddr, int type)
 			return false;
 		break;
 	case META_POR:
+	case DATA_GENERIC:
 		if (unlikely(blkaddr >= MAX_BLKADDR(sbi) ||
 			blkaddr < MAIN_BLKADDR(sbi)))
 			return false;
 		break;
+	case META_GENERIC:
+		if (unlikely(blkaddr < SEG0_BLKADDR(sbi) ||
+			blkaddr >= MAIN_BLKADDR(sbi)))
+			return false;
+		break;
 	default:
 		BUG();
 	}
@@ -160,7 +167,7 @@ int ra_meta_pages(struct f2fs_sb_info *sbi, block_t start, int nrpages,
 
 	for (; nrpages-- > 0; blkno++) {
 
-		if (!is_valid_meta_blkaddr(sbi, blkno, type))
+		if (!f2fs_is_valid_blkaddr(sbi, blkno, type))
 			goto out;
 
 		switch (type) {

fs/f2fs/data.c

@@ -604,7 +604,7 @@ static int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map,
 		goto unlock_out;
 	}
 
-	if (!is_valid_blkaddr(dn.data_blkaddr)) {
+	if (!is_valid_data_blkaddr(sbi, dn.data_blkaddr)) {
 		if (create) {
 			if (unlikely(f2fs_cp_error(sbi))) {
 				err = -EIO;
@@ -1090,7 +1090,7 @@ int do_write_data_page(struct f2fs_io_info *fio)
 	 * If current allocation needs SSR,
 	 * it had better in-place writes for updated data.
 	 */
-	if (unlikely(is_valid_blkaddr(fio->blk_addr) &&
+	if (unlikely(is_valid_data_blkaddr(fio->sbi, fio->blk_addr) &&
 			!is_cold_data(page) &&
 			need_inplace_update(inode))) {
 		rewrite_data_page(fio);

fs/f2fs/f2fs.h

@@ -135,7 +135,7 @@ struct cp_control {
 };
 
 /*
- * For CP/NAT/SIT/SSA readahead
+ * indicate meta/data type
  */
 enum {
 	META_CP,
@@ -143,6 +143,8 @@ enum {
 	META_SIT,
 	META_SSA,
 	META_POR,
+	DATA_GENERIC,
+	META_GENERIC,
 };
 
 /* for the list of ino */
@@ -1647,13 +1649,36 @@ static inline void *f2fs_kvzalloc(size_t size, gfp_t flags)
 	(pgofs - ADDRS_PER_INODE(fi) + ADDRS_PER_BLOCK) /	\
 	ADDRS_PER_BLOCK * ADDRS_PER_BLOCK + ADDRS_PER_INODE(fi))
 
-static inline bool is_valid_blkaddr(block_t blkaddr)
+bool f2fs_is_valid_blkaddr(struct f2fs_sb_info *sbi,
+					block_t blkaddr, int type);
+void f2fs_msg(struct super_block *sb, const char *level, const char *fmt, ...);
+static inline void verify_blkaddr(struct f2fs_sb_info *sbi,
+					block_t blkaddr, int type)
+{
+	if (!f2fs_is_valid_blkaddr(sbi, blkaddr, type)) {
+		f2fs_msg(sbi->sb, KERN_ERR,
+			"invalid blkaddr: %u, type: %d, run fsck to fix.",
+			blkaddr, type);
+		f2fs_bug_on(sbi, 1);
+	}
+}
+
+static inline bool __is_valid_data_blkaddr(block_t blkaddr)
 {
 	if (blkaddr == NEW_ADDR || blkaddr == NULL_ADDR)
 		return false;
 	return true;
 }
 
+static inline bool is_valid_data_blkaddr(struct f2fs_sb_info *sbi,
+						block_t blkaddr)
+{
+	if (!__is_valid_data_blkaddr(blkaddr))
+		return false;
+	verify_blkaddr(sbi, blkaddr, DATA_GENERIC);
+	return true;
+}
+
 /*
  * file.c
  */
@@ -1825,7 +1850,8 @@ void destroy_segment_manager_caches(void);
 struct page *grab_meta_page(struct f2fs_sb_info *, pgoff_t);
 struct page *get_meta_page(struct f2fs_sb_info *, pgoff_t);
 struct page *get_tmp_page(struct f2fs_sb_info *, pgoff_t);
-bool is_valid_meta_blkaddr(struct f2fs_sb_info *sbi, block_t blkaddr, int type);
+bool f2fs_is_valid_blkaddr(struct f2fs_sb_info *sbi,
+					block_t blkaddr, int type);
 int ra_meta_pages(struct f2fs_sb_info *, block_t, int, int, bool);
 void ra_meta_pages_cond(struct f2fs_sb_info *, pgoff_t);
 long sync_meta_pages(struct f2fs_sb_info *, enum page_type, long);

fs/f2fs/file.c

@@ -305,13 +305,13 @@ static pgoff_t __get_first_dirty_index(struct address_space *mapping,
 	return pgofs;
 }
 
-static bool __found_offset(block_t blkaddr, pgoff_t dirty, pgoff_t pgofs,
-							int whence)
+static bool __found_offset(struct f2fs_sb_info *sbi, block_t blkaddr,
+				pgoff_t dirty, pgoff_t pgofs, int whence)
 {
 	switch (whence) {
 	case SEEK_DATA:
 		if ((blkaddr == NEW_ADDR && dirty == pgofs) ||
-			is_valid_blkaddr(blkaddr))
+			is_valid_data_blkaddr(sbi, blkaddr))
 			return true;
 		break;
 	case SEEK_HOLE:
@@ -374,7 +374,8 @@ static loff_t f2fs_seek_block(struct file *file, loff_t offset, int whence)
 			block_t blkaddr;
 			blkaddr = datablock_addr(dn.node_page, dn.ofs_in_node);
 
-			if (__found_offset(blkaddr, dirty, pgofs, whence)) {
+			if (__found_offset(F2FS_I_SB(inode), blkaddr, dirty,
+							pgofs, whence)) {
 				f2fs_put_dnode(&dn);
 				goto found;
 			}

fs/f2fs/inode.c

@@ -50,11 +50,12 @@ static void __get_inode_rdev(struct inode *inode, struct f2fs_inode *ri)
 	}
 }
 
-static bool __written_first_block(struct f2fs_inode *ri)
+static bool __written_first_block(struct f2fs_sb_info *sbi,
+					struct f2fs_inode *ri)
 {
 	block_t addr = le32_to_cpu(ri->i_addr[0]);
 
-	if (is_valid_blkaddr(addr))
+	if (is_valid_data_blkaddr(sbi, addr))
 		return true;
 	return false;
 }
@@ -149,7 +150,7 @@ static int do_read_inode(struct inode *inode)
 	/* get rdev by using inline_info */
 	__get_inode_rdev(inode, ri);
 
-	if (__written_first_block(ri))
+	if (__written_first_block(sbi, ri))
 		set_inode_flag(F2FS_I(inode), FI_FIRST_BLOCK_WRITTEN);
 
 	f2fs_put_page(node_page, 1);

fs/f2fs/node.c

@@ -296,7 +296,7 @@ static void set_node_addr(struct f2fs_sb_info *sbi, struct node_info *ni,
 			new_blkaddr == NULL_ADDR);
 	f2fs_bug_on(sbi, nat_get_blkaddr(e) == NEW_ADDR &&
 			new_blkaddr == NEW_ADDR);
-	f2fs_bug_on(sbi, is_valid_blkaddr(nat_get_blkaddr(e)) &&
+	f2fs_bug_on(sbi, is_valid_data_blkaddr(sbi, nat_get_blkaddr(e)) &&
 			new_blkaddr == NEW_ADDR);
 
 	/* increment version no as node is removed */
@@ -311,7 +311,7 @@ static void set_node_addr(struct f2fs_sb_info *sbi, struct node_info *ni,
 
 	/* change address */
 	nat_set_blkaddr(e, new_blkaddr);
-	if (!is_valid_blkaddr(new_blkaddr))
+	if (!is_valid_data_blkaddr(sbi, new_blkaddr))
 		set_nat_flag(e, IS_CHECKPOINTED, false);
 	__set_nat_cache_dirty(nm_i, e);
 

fs/f2fs/recovery.c

@@ -208,7 +208,7 @@ static int find_fsync_dnodes(struct f2fs_sb_info *sbi, struct list_head *head)
 	while (1) {
 		struct fsync_inode_entry *entry;
 
-		if (!is_valid_meta_blkaddr(sbi, blkaddr, META_POR))
+		if (!f2fs_is_valid_blkaddr(sbi, blkaddr, META_POR))
 			return 0;
 
 		page = get_tmp_page(sbi, blkaddr);
@@ -443,7 +443,7 @@ static int do_recover_data(struct f2fs_sb_info *sbi, struct inode *inode,
 		}
 
 		/* dest is valid block, try to recover from src to dest */
-		if (is_valid_meta_blkaddr(sbi, dest, META_POR)) {
+		if (f2fs_is_valid_blkaddr(sbi, dest, META_POR)) {
 
 			if (src == NULL_ADDR) {
 				err = reserve_new_block(&dn);
@@ -494,7 +494,7 @@ static int recover_data(struct f2fs_sb_info *sbi, struct list_head *inode_list,
 	while (1) {
 		struct fsync_inode_entry *entry;
 
-		if (!is_valid_meta_blkaddr(sbi, blkaddr, META_POR))
+		if (!f2fs_is_valid_blkaddr(sbi, blkaddr, META_POR))
 			break;
 
 		ra_meta_pages_cond(sbi, blkaddr);

fs/f2fs/segment.c

@@ -752,7 +752,7 @@ bool is_checkpointed_data(struct f2fs_sb_info *sbi, block_t blkaddr)
 	struct seg_entry *se;
 	bool is_cp = false;
 
-	if (!is_valid_blkaddr(blkaddr))
+	if (!is_valid_data_blkaddr(sbi, blkaddr))
 		return true;
 
 	mutex_lock(&sit_i->sentry_lock);
@@ -1466,7 +1466,7 @@ void f2fs_wait_on_encrypted_page_writeback(struct f2fs_sb_info *sbi,
 {
 	struct page *cpage;
 
-	if (!is_valid_blkaddr(blkaddr))
+	if (!is_valid_data_blkaddr(sbi, blkaddr))
 		return;
 
 	f2fs_bug_on(sbi, blkaddr == NULL_ADDR);

fs/f2fs/segment.h

@@ -80,7 +80,7 @@
 	(GET_SEGOFF_FROM_SEG0(sbi, blk_addr) & (sbi->blocks_per_seg - 1))
 
 #define GET_SEGNO(sbi, blk_addr)					\
-	((!is_valid_blkaddr(blk_addr)) ?			\
+	((!is_valid_data_blkaddr(sbi, blk_addr)) ?			\
 	NULL_SEGNO : GET_L2R_SEGNO(FREE_I(sbi),			\
 		GET_SEGNO_FROM_SEG0(sbi, blk_addr)))
 #define GET_SECNO(sbi, segno)					\
@@ -588,11 +588,9 @@ static inline void verify_block_addr(struct f2fs_io_info *fio, block_t blk_addr)
 
 	if (PAGE_TYPE_OF_BIO(fio->type) == META &&
 				(!is_read_io(fio->rw) || fio->is_meta))
-		BUG_ON(blk_addr < SEG0_BLKADDR(sbi) ||
-				blk_addr >= MAIN_BLKADDR(sbi));
+		verify_blkaddr(sbi, blk_addr, META_GENERIC);
 	else
-		BUG_ON(blk_addr < MAIN_BLKADDR(sbi) ||
-				blk_addr >= MAX_BLKADDR(sbi));
+		verify_blkaddr(sbi, blk_addr, DATA_GENERIC);
 }
 
 /*