f2fs: introduce dot and dotdot name check

This patch adds an inline function to check dot and dotdot names.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index e99a404..b8f99fd 100644 (file)
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -1454,6 +1454,17 @@ static inline void f2fs_stop_checkpoint(struct f2fs_sb_info *sbi)
        sbi->sb->s_flags |= MS_RDONLY;
 }
 
+static inline bool is_dot_dotdot(const struct qstr *str)
+{
+       if (str->len == 1 && str->name[0] == '.')
+               return true;
+
+       if (str->len == 2 && str->name[0] == '.' && str->name[1] == '.')
+               return true;
+
+       return false;
+}
+
 #define get_inode_mode(i) \
        ((is_inode_flag_set(F2FS_I(i), FI_ACL_MODE)) ? \
         (F2FS_I(i)->i_acl_mode) : ((i)->i_mode))

diff --git a/fs/f2fs/hash.c b/fs/f2fs/hash.c
index a844fcf..71b7206 100644 (file)
--- a/fs/f2fs/hash.c
+++ b/fs/f2fs/hash.c
@@ -79,8 +79,7 @@ f2fs_hash_t f2fs_dentry_hash(const struct qstr *name_info)
        const unsigned char *name = name_info->name;
        size_t len = name_info->len;
 
-       if ((len <= 2) && (name[0] == '.') &&
-               (name[1] == '.' || name[1] == '\0'))
+       if (is_dot_dotdot(name_info))
                return 0;
 
        /* Initialize the default seed for the hash checksum functions */