Thread A:                                       Thread B:

-f2fs_remount
    -sbi->mount_opt.opt = 0;
                                                <--- -f2fs_iget
                                                         -do_read_inode
                                                             
-f2fs_init_extent_tree
                                                                 
-F2FS_I(inode)->extent_tree is NULL
        -default_options && parse_options
            -remount return
                                                <---  -f2fs_map_blocks
                                                          
-f2fs_lookup_extent_tree
                                                              -f2fs_bug_on(sbi, 
!et);

The same problem with f2fs_new_inode.

Signed-off-by: Yunlei He <heyun...@huawei.com>
---
 fs/f2fs/extent_cache.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/fs/f2fs/extent_cache.c b/fs/f2fs/extent_cache.c
index 2f98d70..ff2352a 100644
--- a/fs/f2fs/extent_cache.c
+++ b/fs/f2fs/extent_cache.c
@@ -320,7 +320,7 @@ static void __drop_largest_extent(struct inode *inode,
 }
 
 /* return true, if inode page is changed */
-bool f2fs_init_extent_tree(struct inode *inode, struct f2fs_extent *i_ext)
+static bool __f2fs_init_extent_tree(struct inode *inode, struct f2fs_extent 
*i_ext)
 {
        struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
        struct extent_tree *et;
@@ -358,6 +358,16 @@ bool f2fs_init_extent_tree(struct inode *inode, struct 
f2fs_extent *i_ext)
        return false;
 }
 
+bool f2fs_init_extent_tree(struct inode *inode, struct f2fs_extent *i_ext)
+{
+       bool ret =  __f2fs_init_extent_tree(inode, i_ext);
+
+       if (!F2FS_I(inode)->extent_tree)
+               set_inode_flag(inode, FI_NO_EXTENT);
+
+       return ret;
+}
+
 static bool f2fs_lookup_extent_tree(struct inode *inode, pgoff_t pgofs,
                                                        struct extent_info *ei)
 {
-- 
1.9.1


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