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block: add GENHD_FL_NO_PART_SCAN

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There are cases where suppressing partition scan is useful - e.g. for
lo devices and pseudo SATA devices which advertise to be a disk but
get upset on partition scan (some port multiplier control devices show
such behavior).

This patch adds GENHD_FL_NO_PART_SCAN which suppresses partition scan
regardless of the number of possible partitions.  disk_partitionable()
is renamed to disk_part_scan_enabled() as suppressing partition scan
doesn't imply the device can't be partitioned using
BLKPG_ADD/DEL_PARTITION calls from userland.  show_partition() now
directly tests disk_max_parts() to maintain backward-compatibility.

-v2: Updated to make it clear that only partition scan is suppressed
     not partitioning itself as suggested by Kay Sievers.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
This commit is contained in:
Tejun Heo 2011-08-23 20:01:04 +02:00 committed by Jens Axboe
parent 322a8b0340
commit d27769ec3d
4 changed files with 8 additions and 6 deletions
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4
block/genhd.c
View File

@ -536,7 +536,7 @@ void register_disk(struct gendisk *disk)
disk->slave_dir = kobject_create_and_add("slaves", &ddev->kobj);
/* No minors to use for partitions */
if (!disk_partitionable(disk))
if (!disk_part_scan_enabled(disk))
goto exit;
/* No such device (e.g., media were just removed) */
@ -841,7 +841,7 @@ static int show_partition(struct seq_file *seqf, void *v)
char buf[BDEVNAME_SIZE];
/* Don't show non-partitionable removeable devices or empty devices */
if (!get_capacity(sgp) || (!disk_partitionable(sgp) &&
if (!get_capacity(sgp) || (!disk_max_parts(sgp) &&
(sgp->flags & GENHD_FL_REMOVABLE)))
return 0;
if (sgp->flags & GENHD_FL_SUPPRESS_PARTITION_INFO)

2
block/ioctl.c
View File

@ -101,7 +101,7 @@ static int blkdev_reread_part(struct block_device *bdev)
struct gendisk *disk = bdev->bd_disk;
int res;
if (!disk_partitionable(disk) || bdev != bdev->bd_contains)
if (!disk_part_scan_enabled(disk) || bdev != bdev->bd_contains)
return -EINVAL;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;

2
fs/block_dev.c
View File

@ -971,7 +971,7 @@ static void flush_disk(struct block_device *bdev, bool kill_dirty)
if (!bdev->bd_disk)
return;
if (disk_partitionable(bdev->bd_disk))
if (disk_part_scan_enabled(bdev->bd_disk))
bdev->bd_invalidated = 1;
}

6
include/linux/genhd.h
View File

@ -128,6 +128,7 @@ struct hd_struct {
#define GENHD_FL_EXT_DEVT 64 /* allow extended devt */
#define GENHD_FL_NATIVE_CAPACITY 128
#define GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE 256
#define GENHD_FL_NO_PART_SCAN 512
enum {
DISK_EVENT_MEDIA_CHANGE = 1 << 0, /* media changed */
@ -234,9 +235,10 @@ static inline int disk_max_parts(struct gendisk *disk)
return disk->minors;
}
static inline bool disk_partitionable(struct gendisk *disk)
static inline bool disk_part_scan_enabled(struct gendisk *disk)
{
return disk_max_parts(disk) > 1;
return disk_max_parts(disk) > 1 &&
!(disk->flags & GENHD_FL_NO_PART_SCAN);
}
static inline dev_t disk_devt(struct gendisk *disk)