f2fs: expose some sectors to user in inline data or dentry case

If there's some data written through inline data or dentry, we need to shouw
st_blocks. This fixes reporting zero blocks even though there is small written
data.

Cc: stable@vger.kernel.org
Reviewed-by: NChao Yu <yuchao0@huawei.com>
[Jaegeuk Kim: avoid link file for quotacheck]
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/file.c

@@ -686,6 +686,12 @@ int f2fs_getattr(const struct path *path, struct kstat *stat,
 				  STATX_ATTR_NODUMP);
 
 	generic_fillattr(inode, stat);
+
+	/* we need to show initial sectors used for inline_data/dentries */
+	if ((S_ISREG(inode->i_mode) && f2fs_has_inline_data(inode)) ||
+					f2fs_has_inline_dentry(inode))
+		stat->blocks += (stat->size + 511) >> 9;
+
 	return 0;
 }