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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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2
include/linux/libata.h
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@@ -427,6 +427,7 @@ struct ata_queued_cmd {
int dma_dir;
unsigned int pad_len;
unsigned int sect_size;
unsigned int nbytes;
unsigned int curbytes;
@@ -1182,6 +1183,7 @@ static inline void ata_qc_reinit(struct ata_queued_cmd *qc)
qc->n_elem = 0;
qc->err_mask = 0;
qc->pad_len = 0;
qc->sect_size = ATA_SECT_SIZE;
ata_tf_init(qc->dev, &qc->tf);