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1e32c57893
Originally #16856 updated Linux Direct I/O requests to use the new pin_user_pages API. However, it was an oversight that this PR only handled iov_iter's of type ITER_IOVEC and ITER_UBUF. Other iov_iter types may try and use the pin_user_pages API if it is available. This can lead to panics as the iov_iter is not being iterated over correctly in zfs_uio_pin_user_pages(). Unfortunately, generic iov_iter API's that call pin_user_page_fast() are protected as GPL only. Rather than update zfs_uio_pin_user_pages() to account for all iov_iter types, we can simply just call zfs_uio_get_dio_page_iov_iter() if the iov_iter type is not ITER_IOVEC or ITER_UBUF. zfs_uio_get_dio_page_iov_iter() calls the iov_iter_get_pages() calls that can handle any iov_iter type. In the future it might be worth using the exposed iov_iter iterator functions that are included in the header iov_iter.h since v6.7. These functions allow for any iov_iter type to be iterated over and advanced while applying a step function during iteration. This could possibly be leveraged in zfs_uio_pin_user_pages(). A new ZFS test case was added to test that a ITER_BVEC is handled correctly using this new code path. This test case was provided though issue #16956. Reviewed-by: Alexander Motin <mav@FreeBSD.org> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Ameer Hamza <ahamza@ixsystems.com> Signed-off-by: Brian Atkinson <batkinson@lanl.gov> Closes #16956 Closes #17006 |
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