[PATCH] libata: add per-device max_sectors

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>

1 files changed, 2 insertions, 2 deletions

diff --git a/include/linux/libata.h b/include/linux/libata.h
index 853c98859a9f..afe46457124e 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -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 */