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block: deprecate autoloading based on dev_t

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Make the legacy dev_t based autoloading optional and add a deprecation
warning.  This kind of autoloading has ceased to be useful about 20 years
ago.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20220104071647.164918-1-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig
2022-01-04 08:16:47 +01:00
committed by Jens Axboe
parent 26291c54e1
commit fbdee71bb5
3 changed files with 24 additions and 3 deletions
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9
block/bdev.c
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@@ -733,12 +733,15 @@ struct block_device *blkdev_get_no_open(dev_t dev)
struct inode *inode;
inode = ilookup(blockdev_superblock, dev);
if (!inode) {
if (!inode && IS_ENABLED(CONFIG_BLOCK_LEGACY_AUTOLOAD)) {
blk_request_module(dev);
inode = ilookup(blockdev_superblock, dev);
if (!inode)
return NULL;
if (inode)
pr_warn_ratelimited(
"block device autoloading is deprecated. It will be removed in Linux 5.19\n");
}
if (!inode)
return NULL;
/* switch from the inode reference to a device mode one: */
bdev = &BDEV_I(inode)->bdev;