f2fs: fix to disable compression on directory

It needs to call f2fs_disable_compressed_file() to disable
compression on directory.
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/f2fs.h

@@ -3849,10 +3849,12 @@ static inline u64 f2fs_disable_compressed_file(struct inode *inode)
 
 	if (!f2fs_compressed_file(inode))
 		return 0;
+	if (S_ISREG(inode->i_mode)) {
 		if (get_dirty_pages(inode))
 			return 1;
 		if (fi->i_compr_blocks)
 			return fi->i_compr_blocks;
+	}
 
 	fi->i_flags &= ~F2FS_COMPR_FL;
 	stat_dec_compr_inode(inode);

fs/f2fs/file.c

@@ -1815,7 +1815,7 @@ static int f2fs_setflags_common(struct inode *inode, u32 iflags, u32 mask)
 	}
 
 	if ((iflags ^ masked_flags) & F2FS_COMPR_FL) {
-		if (S_ISREG(inode->i_mode) && (masked_flags & F2FS_COMPR_FL)) {
+		if (masked_flags & F2FS_COMPR_FL) {
 			if (f2fs_disable_compressed_file(inode))
 				return -EINVAL;
 		}