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SubjectRe: [PATCH 3/4] ide-gd: implement block device ->set_capacity method
Date
On Sunday 31 May 2009 16:39:31 Bartlomiej Zolnierkiewicz wrote:
> From: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
> Subject: [PATCH] ide-gd: implement block device ->set_capacity method
>
> * 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.
>
> 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>
> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

v2 interdiff

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.
---
ide-disk.c | 58 +++++++++++++++++++++++++++++++++++++++++++---------------
1 file changed, 43 insertions(+), 15 deletions(-)

diff -u b/drivers/ide/ide-disk.c b/drivers/ide/ide-disk.c
--- b/drivers/ide/ide-disk.c
+++ b/drivers/ide/ide-disk.c
@@ -302,14 +302,12 @@
{ 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)) {
/*
@@ -320,6 +318,26 @@
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;

@@ -332,13 +350,10 @@
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)
@@ -399,12 +414,25 @@
static u64 ide_disk_set_capacity(ide_drive_t *drive, u64 capacity)
{
u64 set = min(capacity, drive->probed_capacity);
- int lba48 = ata_id_lba48_enabled(drive->id);
-
- capacity = idedisk_set_max_address(drive, set, lba48);
- if (capacity)
- drive->capacity64 = 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;
}


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