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dm: disable WRITE SAME
WRITE SAME bios are not yet handled correctly by device-mapper so disable their use on device-mapper devices by setting max_write_same_sectors to zero. As an example, a ciphertext device is incompatible because the data gets changed according to the location at which it written and so the dm crypt target cannot support it. Signed-off-by: Mike Snitzer <snitzer@redhat.com> Cc: stable@vger.kernel.org Cc: Milan Broz <mbroz@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
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@ -1445,6 +1445,8 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
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else
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else
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queue_flag_clear_unlocked(QUEUE_FLAG_NONROT, q);
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queue_flag_clear_unlocked(QUEUE_FLAG_NONROT, q);
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q->limits.max_write_same_sectors = 0;
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dm_table_set_integrity(t);
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dm_table_set_integrity(t);
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/*
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/*
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