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libata: add support for READ/WRITE LONG

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The READ/WRITE LONG commands are theoretically obsolete,
but the majority of drives in existance still implement them.

The WRITE_LONG and WRITE_LONG_ONCE commands are of particular
interest for fault injection testing -- eg. creating "media errors"
at specific locations on a disk.

The fussy bit is that these commands require a non-standard
sector size, usually 520 bytes instead of 512.

This patch adds support to libata for READ/WRITE LONG commands
issued via SG_IO/ATA_16.

Signed-off-by:  Mark Lord <mlord@pobox.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Mark Lord
2007-03-16 10:22:26 -04:00
committed by Jeff Garzik
parent 1234010684
commit 5a5dbd18a7
4 changed files with 30 additions and 10 deletions
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12
drivers/ata/libata-scsi.c
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@@ -2678,6 +2678,18 @@ static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc)
tf->device = qc->dev->devno ?
tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1;
/* READ/WRITE LONG use a non-standard sect_size */
qc->sect_size = ATA_SECT_SIZE;
switch (tf->command) {
case ATA_CMD_READ_LONG:
case ATA_CMD_READ_LONG_ONCE:
case ATA_CMD_WRITE_LONG:
case ATA_CMD_WRITE_LONG_ONCE:
if (tf->protocol != ATA_PROT_PIO || tf->nsect != 1)
goto invalid_fld;
qc->sect_size = scmd->request_bufflen;
}
/*
* Filter SET_FEATURES - XFER MODE command -- otherwise,
* SET_FEATURES - XFER MODE must be preceded/succeeded