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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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4
kernel/power/swap.c
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@@ -357,7 +357,7 @@ static int swsusp_swap_check(void)
root_swap = res;
hib_resume_bdev = blkdev_get_by_dev(swsusp_resume_device, FMODE_WRITE,
NULL);
NULL, NULL);
if (IS_ERR(hib_resume_bdev))
return PTR_ERR(hib_resume_bdev);
@@ -1524,7 +1524,7 @@ int swsusp_check(void)
mode |= FMODE_EXCL;
hib_resume_bdev = blkdev_get_by_dev(swsusp_resume_device,
mode, &holder);
mode, &holder, NULL);
if (!IS_ERR(hib_resume_bdev)) {
set_blocksize(hib_resume_bdev, PAGE_SIZE);
clear_page(swsusp_header);