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partitions: add ->set_capacity block device method

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* Add ->set_capacity block device method and use it in rescan_partitions()
  to attempt enabling native capacity of the device upon detecting the
  partition which exceeds device capacity.

* Add GENHD_FL_NATIVE_CAPACITY flag to try limit attempts of enabling
  native capacity during partition scan.

Together with the consecutive patch implementing ->set_capacity method in
ide-gd device driver 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>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Emphatically-Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
Bartlomiej Zolnierkiewicz 2009-06-07 13:52:52 +02:00
parent 02c33b123e
commit db429e9ec0
3 changed files with 35 additions and 11 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

37
fs/partitions/check.c
View file

@ -546,29 +546,50 @@ int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
/* add partitions */
for (p = 1; p < state->limit; p++) {
sector_t size = state->parts[p].size;
sector_t from = state->parts[p].from;
sector_t size, from;
try_scan:
size = state->parts[p].size;
if (!size)
continue;
from = state->parts[p].from;
if (from >= get_capacity(disk)) {
printk(KERN_WARNING
"%s: p%d ignored, start %llu is behind the end of the disk\n",
disk->disk_name, p, (unsigned long long) from);
continue;
}
if (from + size > get_capacity(disk)) {
struct block_device_operations *bdops = disk->fops;
unsigned long long capacity;
printk(KERN_WARNING
"%s: p%d size %llu exceeds device capacity, ",
disk->disk_name, p, (unsigned long long) size);
if (bdops->set_capacity &&
(disk->flags & GENHD_FL_NATIVE_CAPACITY) == 0) {
printk(KERN_CONT "enabling native capacity\n");
capacity = bdops->set_capacity(disk, ~0ULL);
disk->flags |= GENHD_FL_NATIVE_CAPACITY;
if (capacity > get_capacity(disk)) {
set_capacity(disk, capacity);
check_disk_size_change(disk, bdev);
bdev->bd_invalidated = 0;
}
goto try_scan;
} else {
/*
* we can not ignore partitions of broken tables
* created by for example camera firmware, but we
* limit them to the end of the disk to avoid
* created by for example camera firmware, but
* we limit them to the end of the disk to avoid
* creating invalid block devices
*/
printk(KERN_WARNING
"%s: p%d size %llu exceeds device capacity, "
"limited to end of disk\n",
disk->disk_name, p, (unsigned long long) size);
printk(KERN_CONT "limited to end of disk\n");
size = get_capacity(disk) - from;
}
}
part = add_partition(disk, p, from, size,
state->parts[p].flags);
if (IS_ERR(part)) {

2
include/linux/blkdev.h
View file

@ -1106,6 +1106,8 @@ struct block_device_operations {
int (*direct_access) (struct block_device *, sector_t,
void **, unsigned long *);
int (*media_changed) (struct gendisk *);
unsigned long long (*set_capacity) (struct gendisk *,
unsigned long long);
int (*revalidate_disk) (struct gendisk *);
int (*getgeo)(struct block_device *, struct hd_geometry *);
struct module *owner;

1
include/linux/genhd.h
View file

@ -113,6 +113,7 @@ struct hd_struct {
#define GENHD_FL_UP 16
#define GENHD_FL_SUPPRESS_PARTITION_INFO 32
#define GENHD_FL_EXT_DEVT 64 /* allow extended devt */
#define GENHD_FL_NATIVE_CAPACITY 128
#define BLK_SCSI_MAX_CMDS (256)
#define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))