5.4-stable review patch. If anyone has any objections, please let me know.
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From: Andreas Gruenbacher agruenba@redhat.com
commit 9e888998ea4d22257b07ce911576509486fa0667 upstream.
inode_to_wb() is used also for filesystems that don't support cgroup writeback. For these filesystems inode->i_wb is stable during the lifetime of the inode (it points to bdi->wb) and there's no need to hold locks protecting the inode->i_wb dereference. Improve the warning in inode_to_wb() to not trigger for these filesystems.
Link: https://lkml.kernel.org/r/20250412163914.3773459-3-agruenba@redhat.com Fixes: aaa2cacf8184 ("writeback: add lockdep annotation to inode_to_wb()") Signed-off-by: Jan Kara jack@suse.cz Signed-off-by: Andreas Gruenbacher agruenba@redhat.com Reviewed-by: Andreas Gruenbacher agruenba@redhat.com Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- include/linux/backing-dev.h | 1 + 1 file changed, 1 insertion(+)
--- a/include/linux/backing-dev.h +++ b/include/linux/backing-dev.h @@ -344,6 +344,7 @@ static inline struct bdi_writeback *inod { #ifdef CONFIG_LOCKDEP WARN_ON_ONCE(debug_locks && + (inode->i_sb->s_iflags & SB_I_CGROUPWB) && (!lockdep_is_held(&inode->i_lock) && !lockdep_is_held(&inode->i_mapping->i_pages.xa_lock) && !lockdep_is_held(&inode->i_wb->list_lock)));