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dax: skip read lock assertion for read-only filesystems

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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: 168316db35 ("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>
This commit is contained in:
Yuezhang Mo 2025-09-30 13:42:57 +08:00 committed by Christian Brauner
parent d68a29a6a2
commit 154d1e7ad9
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GPG key ID: 91C61BC06578DCA2
1 changed files with 1 additions and 1 deletions
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fs/dax.c
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@ -1725,7 +1725,7 @@ 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);
}