f2fs: inode: fix to do sanity check on extent cache correctly

commit 269d119 upstream.

In do_read_inode(), sanity check for extent cache should be called after
f2fs_init_read_extent_tree(), fix it.

Fixes: 72840cc ("f2fs: allocate the extent_cache by default")
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

fs/f2fs/extent_cache.c

@@ -15,6 +15,31 @@
 #include "node.h"
 #include <trace/events/f2fs.h>
 
+bool sanity_check_extent_cache(struct inode *inode)
+{
+	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
+	struct f2fs_inode_info *fi = F2FS_I(inode);
+	struct extent_info *ei;
+
+	if (!fi->extent_tree[EX_READ])
+		return true;
+
+	ei = &fi->extent_tree[EX_READ]->largest;
+
+	if (ei->len &&
+		(!f2fs_is_valid_blkaddr(sbi, ei->blk,
+					DATA_GENERIC_ENHANCE) ||
+		!f2fs_is_valid_blkaddr(sbi, ei->blk + ei->len - 1,
+					DATA_GENERIC_ENHANCE))) {
+		set_sbi_flag(sbi, SBI_NEED_FSCK);
+		f2fs_warn(sbi, "%s: inode (ino=%lx) extent info [%u, %u, %u] is incorrect, run fsck to fix",
+			  __func__, inode->i_ino,
+			  ei->blk, ei->fofs, ei->len);
+		return false;
+	}
+	return true;
+}
+
 static void __set_extent_info(struct extent_info *ei,
 				unsigned int fofs, unsigned int len,
 				block_t blk, bool keep_clen,

fs/f2fs/f2fs.h

@@ -4125,6 +4125,7 @@ void f2fs_leave_shrinker(struct f2fs_sb_info *sbi);
 /*
  * extent_cache.c
  */
+bool sanity_check_extent_cache(struct inode *inode);
 struct rb_entry *f2fs_lookup_rb_tree(struct rb_root_cached *root,
 				struct rb_entry *cached_re, unsigned int ofs);
 struct rb_node **f2fs_lookup_rb_tree_for_insert(struct f2fs_sb_info *sbi,

fs/f2fs/inode.c

@@ -262,22 +262,6 @@ static bool sanity_check_inode(struct inode *inode, struct page *node_page)
 		return false;
 	}
 
-	if (fi->extent_tree[EX_READ]) {
-		struct extent_info *ei = &fi->extent_tree[EX_READ]->largest;
-
-		if (ei->len &&
-			(!f2fs_is_valid_blkaddr(sbi, ei->blk,
-						DATA_GENERIC_ENHANCE) ||
-			!f2fs_is_valid_blkaddr(sbi, ei->blk + ei->len - 1,
-						DATA_GENERIC_ENHANCE))) {
-			set_sbi_flag(sbi, SBI_NEED_FSCK);
-			f2fs_warn(sbi, "%s: inode (ino=%lx) extent info [%u, %u, %u] is incorrect, run fsck to fix",
-				  __func__, inode->i_ino,
-				  ei->blk, ei->fofs, ei->len);
-			return false;
-		}
-	}
-
 	if (f2fs_sanity_check_inline_data(inode)) {
 		set_sbi_flag(sbi, SBI_NEED_FSCK);
 		f2fs_warn(sbi, "%s: inode (ino=%lx, mode=%u) should not have inline_data, run fsck to fix",
@@ -481,6 +465,12 @@ static int do_read_inode(struct inode *inode)
 		return -EFSCORRUPTED;
 	}
 
+	if (!sanity_check_extent_cache(inode)) {
+		f2fs_put_page(node_page, 1);
+		f2fs_handle_error(sbi, ERROR_CORRUPTED_INODE);
+		return -EFSCORRUPTED;
+	}
+
 	f2fs_put_page(node_page, 1);
 
 	stat_inc_inline_xattr(inode);