block: introduce holder ops

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

View File

@@ -2616,7 +2616,7 @@ static int journal_init_dev(struct super_block *super,
if (jdev == super->s_dev)
blkdev_mode &= ~FMODE_EXCL;
journal->j_dev_bd = blkdev_get_by_dev(jdev, blkdev_mode,
journal);
journal, NULL);
journal->j_dev_mode = blkdev_mode;
if (IS_ERR(journal->j_dev_bd)) {
result = PTR_ERR(journal->j_dev_bd);
@@ -2632,7 +2632,8 @@ static int journal_init_dev(struct super_block *super,
}
journal->j_dev_mode = blkdev_mode;
journal->j_dev_bd = blkdev_get_by_path(jdev_name, blkdev_mode, journal);
journal->j_dev_bd = blkdev_get_by_path(jdev_name, blkdev_mode, journal,
NULL);
if (IS_ERR(journal->j_dev_bd)) {
result = PTR_ERR(journal->j_dev_bd);
journal->j_dev_bd = NULL;