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block: introduce holder ops

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Add a new blk_holder_ops structure, which is passed to blkdev_get_by_* and
installed in the block_device for exclusive claims.  It will be used to
allow the block layer to call back into the user of the block device for
thing like notification of a removed device or a device resize.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jan Kara <jack@suse.cz>
Acked-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Link: https://lore.kernel.org/r/20230601094459.1350643-10-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig
2023-06-01 11:44:52 +02:00
committed by Jens Axboe
parent 00080f7fb7
commit 0718afd47f
34 changed files with 90 additions and 56 deletions
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6
block/genhd.c
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@@ -370,13 +370,15 @@ int disk_scan_partitions(struct gendisk *disk, fmode_t mode)
* scanners.
*/
if (!(mode & FMODE_EXCL)) {
ret = bd_prepare_to_claim(disk->part0, disk_scan_partitions);
ret = bd_prepare_to_claim(disk->part0, disk_scan_partitions,
NULL);
if (ret)
return ret;
}
set_bit(GD_NEED_PART_SCAN, &disk->state);
bdev = blkdev_get_by_dev(disk_devt(disk), mode & ~FMODE_EXCL, NULL);
bdev = blkdev_get_by_dev(disk_devt(disk), mode & ~FMODE_EXCL, NULL,
NULL);
if (IS_ERR(bdev))
ret = PTR_ERR(bdev);
else