Messages in this thread Patch in this message | | | Date | Wed, 19 Dec 2012 22:07:11 +0100 | From | Milan Broz <> | Subject | [PATCH] dm-crypt: never use write same (was Re: [v3.7 Regression] [SCSI] sd: Implement support for WRITE SAME) |
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Does this help?
dm-crypt: never use write same
Ciphertext device is not compatible with WRITE SAME, disable it for all dmcrypt devices.
Signed-off-by: Milan Broz <mbroz@redhat.com>
--- a/drivers/md/dm-crypt.c +++ b/drivers/md/dm-crypt.c @@ -1844,6 +1844,12 @@ static int crypt_iterate_devices(struct dm_target *ti, return fn(ti, cc->dev, cc->start, ti->len, data); } +static void crypt_io_hints(struct dm_target *ti, + struct queue_limits *limits) +{ + limits->max_write_same_sectors = 0; +} + static struct target_type crypt_target = { .name = "crypt", .version = {1, 11, 0}, @@ -1858,6 +1864,7 @@ static struct target_type crypt_target = { .message = crypt_message, .merge = crypt_merge, .iterate_devices = crypt_iterate_devices, + .io_hints = crypt_io_hints, }; static int __init dm_crypt_init(void)
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