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block: remove GENHD_FL_EXT_DEVT

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All modern drivers can support extra partitions using the extended
dev_t.  In fact except for the ioctl method drivers never even see
partitions in normal operation.

So remove the GENHD_FL_EXT_DEVT and allow extra partitions for all
block devices that do support partitions, and require those that
do not support partitions to explicit disallow them using
GENHD_FL_NO_PART.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20211122130625.1136848-12-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig
2021-11-22 14:06:22 +01:00
committed by Jens Axboe
parent 3b5149ac50
commit 1ebe2e5f9d
27 changed files with 30 additions and 48 deletions
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9
block/partitions/core.c
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@@ -98,13 +98,12 @@ static void bdev_set_nr_sectors(struct block_device *bdev, sector_t sectors)
static struct parsed_partitions *allocate_partitions(struct gendisk *hd)
{
struct parsed_partitions *state;
int nr;
int nr = DISK_MAX_PARTS;
state = kzalloc(sizeof(*state), GFP_KERNEL);
if (!state)
return NULL;
nr = disk_max_parts(hd);
state->parts = vzalloc(array_size(nr, sizeof(state->parts[0])));
if (!state->parts) {
kfree(state);
@@ -326,7 +325,7 @@ static struct block_device *add_partition(struct gendisk *disk, int partno,
lockdep_assert_held(&disk->open_mutex);
if (partno >= disk_max_parts(disk))
if (partno >= DISK_MAX_PARTS)
return ERR_PTR(-EINVAL);
/*
@@ -604,7 +603,7 @@ static int blk_add_partitions(struct gendisk *disk)
struct parsed_partitions *state;
int ret = -EAGAIN, p;
if (!disk_part_scan_enabled(disk))
if (disk->flags & GENHD_FL_NO_PART)
return 0;
state = check_partition(disk);
@@ -687,7 +686,7 @@ rescan:
* userspace for this particular setup.
*/
if (invalidate) {
if (disk_part_scan_enabled(disk) ||
if (!(disk->flags & GENHD_FL_NO_PART) ||
!(disk->flags & GENHD_FL_REMOVABLE))
set_capacity(disk, 0);
}