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authorBartlomiej Zolnierkiewicz <bzolnier@gmail.com>2009-06-07 13:52:52 +0200
committerBartlomiej Zolnierkiewicz <bzolnier@gmail.com>2009-06-07 13:52:52 +0200
commite957b60d1583022a0f7c03267d37fcae2ddb78b1 (patch)
tree5e9518eb38d427b9ac41c9b90b31b9b2453aebfc /drivers/ide/ide-disk.c
parentdb429e9ec0f9dee2d8e50c154f04f29f880fc9d6 (diff)
downloadop-kernel-dev-e957b60d1583022a0f7c03267d37fcae2ddb78b1.zip
op-kernel-dev-e957b60d1583022a0f7c03267d37fcae2ddb78b1.tar.gz
ide-gd: implement block device ->set_capacity method (v2)
* Use ->probed_capacity to store native device capacity for ATA disks. * Add ->set_capacity method to struct ide_disk_ops. * Implement disk device ->set_capacity method for ATA disks. * Implement block device ->set_capacity method. v2: * Check if LBA and HPA are supported in ide_disk_set_capacity(). * According to the spec the SET MAX ADDRESS command shall be immediately preceded by a READ NATIVE MAX ADDRESS command. * Add ide_disk_hpa_{get_native,set}_capacity() helpers. Together with the previous patch adding ->set_capacity block device method this allows automatic disabling of Host Protected Area (HPA) if any partitions overlapping HPA are detected. Cc: Robert Hancock <hancockrwd@gmail.com> Cc: Frans Pop <elendil@planet.nl> Cc: "Andries E. Brouwer" <Andries.Brouwer@cwi.nl> Cc: Al Viro <viro@zeniv.linux.org.uk> Emphatically-Acked-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Diffstat (limited to 'drivers/ide/ide-disk.c')
-rw-r--r--drivers/ide/ide-disk.c67
1 files changed, 56 insertions, 11 deletions
diff --git a/drivers/ide/ide-disk.c b/drivers/ide/ide-disk.c
index a9fbe2c..61a6d35 100644
--- a/drivers/ide/ide-disk.c
+++ b/drivers/ide/ide-disk.c
@@ -302,14 +302,12 @@ static const struct drive_list_entry hpa_list[] = {
{ NULL, NULL }
};
-static void idedisk_check_hpa(ide_drive_t *drive)
+static u64 ide_disk_hpa_get_native_capacity(ide_drive_t *drive, int lba48)
{
- unsigned long long capacity, set_max;
- int lba48 = ata_id_lba48_enabled(drive->id);
+ u64 capacity, set_max;
capacity = drive->capacity64;
-
- set_max = idedisk_read_native_max_address(drive, lba48);
+ set_max = idedisk_read_native_max_address(drive, lba48);
if (ide_in_drive_list(drive->id, hpa_list)) {
/*
@@ -320,9 +318,31 @@ static void idedisk_check_hpa(ide_drive_t *drive)
set_max--;
}
+ return set_max;
+}
+
+static u64 ide_disk_hpa_set_capacity(ide_drive_t *drive, u64 set_max, int lba48)
+{
+ set_max = idedisk_set_max_address(drive, set_max, lba48);
+ if (set_max)
+ drive->capacity64 = set_max;
+
+ return set_max;
+}
+
+static void idedisk_check_hpa(ide_drive_t *drive)
+{
+ u64 capacity, set_max;
+ int lba48 = ata_id_lba48_enabled(drive->id);
+
+ capacity = drive->capacity64;
+ set_max = ide_disk_hpa_get_native_capacity(drive, lba48);
+
if (set_max <= capacity)
return;
+ drive->probed_capacity = set_max;
+
printk(KERN_INFO "%s: Host Protected Area detected.\n"
"\tcurrent capacity is %llu sectors (%llu MB)\n"
"\tnative capacity is %llu sectors (%llu MB)\n",
@@ -330,13 +350,10 @@ static void idedisk_check_hpa(ide_drive_t *drive)
capacity, sectors_to_MB(capacity),
set_max, sectors_to_MB(set_max));
- set_max = idedisk_set_max_address(drive, set_max, lba48);
-
- if (set_max) {
- drive->capacity64 = set_max;
+ set_max = ide_disk_hpa_set_capacity(drive, set_max, lba48);
+ if (set_max)
printk(KERN_INFO "%s: Host Protected Area disabled.\n",
drive->name);
- }
}
static int ide_disk_get_capacity(ide_drive_t *drive)
@@ -358,6 +375,8 @@ static int ide_disk_get_capacity(ide_drive_t *drive)
drive->capacity64 = drive->cyl * drive->head * drive->sect;
}
+ drive->probed_capacity = drive->capacity64;
+
if (lba) {
drive->dev_flags |= IDE_DFLAG_LBA;
@@ -376,7 +395,7 @@ static int ide_disk_get_capacity(ide_drive_t *drive)
"%llu sectors (%llu MB)\n",
drive->name, (unsigned long long)drive->capacity64,
sectors_to_MB(drive->capacity64));
- drive->capacity64 = 1ULL << 28;
+ drive->probed_capacity = drive->capacity64 = 1ULL << 28;
}
if ((drive->hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA) &&
@@ -392,6 +411,31 @@ static int ide_disk_get_capacity(ide_drive_t *drive)
return 0;
}
+static u64 ide_disk_set_capacity(ide_drive_t *drive, u64 capacity)
+{
+ u64 set = min(capacity, drive->probed_capacity);
+ u16 *id = drive->id;
+ int lba48 = ata_id_lba48_enabled(id);
+
+ if ((drive->dev_flags & IDE_DFLAG_LBA) == 0 ||
+ ata_id_hpa_enabled(id) == 0)
+ goto out;
+
+ /*
+ * according to the spec the SET MAX ADDRESS command shall be
+ * immediately preceded by a READ NATIVE MAX ADDRESS command
+ */
+ capacity = ide_disk_hpa_get_native_capacity(drive, lba48);
+ if (capacity == 0)
+ goto out;
+
+ set = ide_disk_hpa_set_capacity(drive, set, lba48);
+ if (set)
+ return set;
+out:
+ return drive->capacity64;
+}
+
static void idedisk_prepare_flush(struct request_queue *q, struct request *rq)
{
ide_drive_t *drive = q->queuedata;
@@ -741,6 +785,7 @@ static int ide_disk_set_doorlock(ide_drive_t *drive, struct gendisk *disk,
const struct ide_disk_ops ide_ata_disk_ops = {
.check = ide_disk_check,
+ .set_capacity = ide_disk_set_capacity,
.get_capacity = ide_disk_get_capacity,
.setup = ide_disk_setup,
.flush = ide_disk_flush,
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