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loop: also use the default block size from an underlying block device

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Fix the code in loop_reconfigure_limits to pick a default block size for
O_DIRECT file descriptors to also work when the loop device sits on top
of a block device and not just on a regular file on a block device based
file system.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Link: https://lore.kernel.org/r/20240617060532.127975-8-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2024-06-17 08:04:34 +02:00 committed by Jens Axboe
parent a17ece76bc
commit 4ce37fe093
1 changed files with 7 additions and 1 deletions
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8
drivers/block/loop.c
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@ -988,10 +988,16 @@ static int loop_reconfigure_limits(struct loop_device *lo, unsigned short bsize)
{
struct file *file = lo->lo_backing_file;
struct inode *inode = file->f_mapping->host;
struct block_device *backing_bdev = NULL;
struct queue_limits lim;
if (S_ISBLK(inode->i_mode))
backing_bdev = I_BDEV(inode);
else if (inode->i_sb->s_bdev)
backing_bdev = inode->i_sb->s_bdev;
if (!bsize)
bsize = loop_default_blocksize(lo, inode->i_sb->s_bdev);
bsize = loop_default_blocksize(lo, backing_bdev);
lim = queue_limits_start_update(lo->lo_queue);
lim.logical_block_size = bsize;