The commit 168316db3583("dax: assert that i_rwsem is held
exclusive for writes") added lock assertions to ensure proper
locking in DAX operations. However, these assertions trigger
false-positive lockdep warnings since read lock is unnecessary
on read-only filesystems(e.g., erofs).
This patch skips the read lock assertion for read-only filesystems,
eliminating the spurious warnings while maintaining the integrity
checks for writable filesystems.
Fixes: 168316db3583 ("dax: assert that i_rwsem is held exclusive for writes")
Signed-off-by: Yuezhang Mo <[email protected]>
Reviewed-by: Friendy Su <[email protected]>
Reviewed-by: Daniel Palmer <[email protected]>
---
fs/dax.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/dax.c b/fs/dax.c
index 20ecf652c129..260e063e3bc2 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -1752,7 +1752,7 @@ dax_iomap_rw(struct kiocb *iocb, struct iov_iter *iter,
if (iov_iter_rw(iter) == WRITE) {
lockdep_assert_held_write(&iomi.inode->i_rwsem);
iomi.flags |= IOMAP_WRITE;
- } else {
+ } else if (!sb_rdonly(iomi.inode->i_sb)) {
lockdep_assert_held(&iomi.inode->i_rwsem);
}
--
2.43.0
