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Message-Id: <1484063288-18255-3-git-send-email-hch@lst.de> Date: Tue, 10 Jan 2017 16:48:08 +0100 From: Christoph Hellwig <hch@....de> To: Jan Kara <jack@...e.cz> Cc: linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org, linux-nvdimm@...ts.01.org Subject: [PATCH 2/2] dax: assert that i_rwsem is held exclusive for writes Make sure all callers follow the same locking protocol, given that DAX transparantly replaced the normal buffered I/O path. Signed-off-by: Christoph Hellwig <hch@....de> --- fs/dax.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/fs/dax.c b/fs/dax.c index 5c74f60..04734da 100644 --- a/fs/dax.c +++ b/fs/dax.c @@ -1061,8 +1061,12 @@ dax_iomap_rw(struct kiocb *iocb, struct iov_iter *iter, loff_t pos = iocb->ki_pos, ret = 0, done = 0; unsigned flags = 0; - if (iov_iter_rw(iter) == WRITE) + if (iov_iter_rw(iter) == WRITE) { + lockdep_assert_held_exclusive(&inode->i_rwsem); flags |= IOMAP_WRITE; + } else { + lockdep_assert_held(&inode->i_rwsem); + } while (iov_iter_count(iter)) { ret = iomap_apply(inode, pos, iov_iter_count(iter), flags, ops, -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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