From 974d0be0cb8e48d63b9d413a2e1a8fba16cd2583 Mon Sep 17 00:00:00 2001 From: Christian Brauner Date: Tue, 28 Jul 2026 14:04:26 +0200 Subject: [PATCH] writeback: Export __inode_attach_wb() Commit c26339e1df33 ("ext4: Fix data integrity writeout issues in nojournal mode") made ext4_mark_iloc_dirty() attach the inode to a wb before marking it for metadata writeback in nojournal mode. This is the first modular caller of inode_attach_wb() - all users of __inode_attach_wb() so far were built-in - so with CONFIG_EXT4_FS=m and CONFIG_CGROUP_WRITEBACK=y the build now fails at the modpost stage: ERROR: modpost: "__inode_attach_wb" [fs/ext4/ext4.ko] undefined! Export the symbol. Use EXPORT_SYMBOL_GPL() to match the other cgroup writeback exports in this file. Fixes: c26339e1df33 ("ext4: Fix data integrity writeout issues in nojournal mode") Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202607281811.F3c6kRvX-lkp@intel.com/ Signed-off-by: Christian Brauner (Amutable) --- fs/fs-writeback.c | 1 + 1 file changed, 1 insertion(+) diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c index 9d96357731a3..71dd618db075 100644 --- a/fs/fs-writeback.c +++ b/fs/fs-writeback.c @@ -299,6 +299,7 @@ void __inode_attach_wb(struct inode *inode, struct folio *folio) if (unlikely(cmpxchg(&inode->i_wb, NULL, wb))) wb_put(wb); } +EXPORT_SYMBOL_GPL(__inode_attach_wb); /** * inode_cgwb_move_to_attached - put the inode onto wb->b_attached list -- 2.47.3