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[PATCH] libata: add per-device max_sectors

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If a low level driver wants to control max_sectors, it had to adjust
ap->host->max_sectors and set ATA_DFLAG_LOCK_SECTORS to tell
ata_scsi_slave_config not to override the limit.  This is not only
cumbersome but also incorrect for hosts which support more than one
devices per port.

This patch adds per-device ->max_sectors.  If the field is unset
(zero), libata core layer will adjust ->max_sectors according to
default rules.  If the field is set, libata honors the setting.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
This commit is contained in:
Tejun Heo
2006-02-12 23:32:59 +09:00
committed by Jeff Garzik
parent 6e7846e9c5
commit b00eec1d58
4 changed files with 13 additions and 17 deletions
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4
include/linux/libata.h
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@ -122,8 +122,7 @@ enum {
/* struct ata_device stuff */
ATA_DFLAG_LBA48 = (1 << 0), /* device supports LBA48 */
ATA_DFLAG_PIO = (1 << 1), /* device currently in PIO mode */
ATA_DFLAG_LOCK_SECTORS = (1 << 2), /* don't adjust max_sectors */
ATA_DFLAG_LBA = (1 << 3), /* device supports LBA */
ATA_DFLAG_LBA = (1 << 2), /* device supports LBA */
ATA_DEV_UNKNOWN = 0, /* unknown device */
ATA_DEV_ATA = 1, /* ATA device */
@ -348,6 +347,7 @@ struct ata_device {
unsigned int multi_count; /* sectors count for
READ/WRITE MULTIPLE */
unsigned int max_sectors; /* per-device max sectors */
unsigned int cdb_len;
/* for CHS addressing */