libata: add support for READ/WRITE LONG
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>
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 5a40a8d..12237d4 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -427,6 +427,7 @@
int dma_dir;
unsigned int pad_len;
+ unsigned int sect_size;
unsigned int nbytes;
unsigned int curbytes;
@@ -1182,6 +1183,7 @@
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);