Revert "Don't ashift-align vdev read requests."
This reverts commit a5c20e2a0a
which
accidentally introduced a regression for real 4k sector devices.
See issue #1065 for details.
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #1065
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f21e5c6a17
commit
178e73b376
@ -2438,25 +2438,19 @@ zio_vdev_io_start(zio_t *zio)
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align = 1ULL << vd->vdev_top->vdev_ashift;
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/*
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* On Linux, we don't care about read alignment. The backing block
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* device driver will take care of that for us.
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* The only exception is raidz, which needs a full block for parity.
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*/
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if (P2PHASE(zio->io_size, align) != 0 &&
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(zio->io_type != ZIO_TYPE_READ ||
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vd->vdev_ops == &vdev_raidz_ops)) {
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if (P2PHASE(zio->io_size, align) != 0) {
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uint64_t asize = P2ROUNDUP(zio->io_size, align);
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char *abuf = zio_buf_alloc(asize);
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ASSERT(vd == vd->vdev_top);
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if (zio->io_type == ZIO_TYPE_WRITE) {
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bcopy(zio->io_data, abuf, zio->io_size);
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bzero(abuf + zio->io_size, asize - zio->io_size);
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}
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zio_push_transform(zio, abuf, asize, asize, zio_subblock);
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ASSERT(P2PHASE(zio->io_size, align) == 0);
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}
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ASSERT(P2PHASE(zio->io_offset, align) == 0);
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ASSERT(P2PHASE(zio->io_size, align) == 0);
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VERIFY(zio->io_type != ZIO_TYPE_WRITE || spa_writeable(spa));
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/*
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