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writeback: Export __inode_attach_wb()

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Commit c26339e1df ("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: c26339e1df ("ext4: Fix data integrity writeout issues in nojournal mode")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202607281811.F3c6kRvX-lkp@intel.com/
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
This commit is contained in:
Christian Brauner
2026-07-28 14:04:26 +02:00
parent 28cb64a67b
commit 974d0be0cb
1 changed files with 1 additions and 0 deletions
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1
fs/fs-writeback.c
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@@ -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