5.15-stable review patch. If anyone has any objections, please let me know.
------------------
From: Yuezhang Mo Yuezhang.Mo@sony.com
[ Upstream commit 154d1e7ad9e5ce4b2aaefd3862b3dba545ad978d ]
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 Yuezhang.Mo@sony.com Reviewed-by: Friendy Su friendy.su@sony.com Reviewed-by: Daniel Palmer daniel.palmer@sony.com Reviewed-by: Gao Xiang hsiangkao@linux.alibaba.com Signed-off-by: Christian Brauner brauner@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- fs/dax.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/dax.c b/fs/dax.c index 4ab1c493c73f1..504114394995c 100644 --- a/fs/dax.c +++ b/fs/dax.c @@ -1285,7 +1285,7 @@ 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); }