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loop: use the atomic queue limits update API 

Pass the default limits to blk_mq_alloc_disk and then use the
queue_limits_{start,commit}_update API to change the limits in an
atomic way on existing loop gendisks.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Link: https://lore.kernel.org/r/20240213073425.1621680-16-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2024-02-13 08:34:25 +01:00 committed by Jens Axboe
parent 02aed4a1f2
commit 473516b361
1 changed files with 25 additions and 16 deletions
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41
drivers/block/loop.c
View File

@ -750,11 +750,11 @@ static void loop_sysfs_exit(struct loop_device *lo)
&loop_attribute_group);
}
static void loop_config_discard(struct loop_device *lo)
static void loop_config_discard(struct loop_device *lo,
struct queue_limits *lim)
{
struct file *file = lo->lo_backing_file;
struct inode *inode = file->f_mapping->host;
struct request_queue *q = lo->lo_queue;
u32 granularity = 0, max_discard_sectors = 0;
struct kstatfs sbuf;
@ -781,12 +781,12 @@ static void loop_config_discard(struct loop_device *lo)
granularity = sbuf.f_bsize;
}
blk_queue_max_discard_sectors(q, max_discard_sectors);
blk_queue_max_write_zeroes_sectors(q, max_discard_sectors);
lim->max_hw_discard_sectors = max_discard_sectors;
lim->max_write_zeroes_sectors = max_discard_sectors;
if (max_discard_sectors)
q->limits.discard_granularity = granularity;
lim->discard_granularity = granularity;
else
q->limits.discard_granularity = 0;
lim->discard_granularity = 0;
}
struct loop_worker {
@ -975,6 +975,20 @@ loop_set_status_from_info(struct loop_device *lo,
return 0;
}
static int loop_reconfigure_limits(struct loop_device *lo, unsigned short bsize,
bool update_discard_settings)
{
struct queue_limits lim;
lim = queue_limits_start_update(lo->lo_queue);
lim.logical_block_size = bsize;
lim.physical_block_size = bsize;
lim.io_min = bsize;
if (update_discard_settings)
loop_config_discard(lo, &lim);
return queue_limits_commit_update(lo->lo_queue, &lim);
}
static int loop_configure(struct loop_device *lo, blk_mode_t mode,
struct block_device *bdev,
const struct loop_config *config)
@ -1072,11 +1086,10 @@ static int loop_configure(struct loop_device *lo, blk_mode_t mode,
else
bsize = 512;
blk_queue_logical_block_size(lo->lo_queue, bsize);
blk_queue_physical_block_size(lo->lo_queue, bsize);
blk_queue_io_min(lo->lo_queue, bsize);
error = loop_reconfigure_limits(lo, bsize, true);
if (WARN_ON_ONCE(error))
goto out_unlock;
loop_config_discard(lo);
loop_update_rotational(lo);
loop_update_dio(lo);
loop_sysfs_init(lo);
@ -1143,9 +1156,7 @@ static void __loop_clr_fd(struct loop_device *lo, bool release)
lo->lo_offset = 0;
lo->lo_sizelimit = 0;
memset(lo->lo_file_name, 0, LO_NAME_SIZE);
blk_queue_logical_block_size(lo->lo_queue, 512);
blk_queue_physical_block_size(lo->lo_queue, 512);
blk_queue_io_min(lo->lo_queue, 512);
loop_reconfigure_limits(lo, 512, false);
invalidate_disk(lo->lo_disk);
loop_sysfs_exit(lo);
/* let user-space know about this change */
@ -1477,9 +1488,7 @@ static int loop_set_block_size(struct loop_device *lo, unsigned long arg)
invalidate_bdev(lo->lo_device);
blk_mq_freeze_queue(lo->lo_queue);
blk_queue_logical_block_size(lo->lo_queue, arg);
blk_queue_physical_block_size(lo->lo_queue, arg);
blk_queue_io_min(lo->lo_queue, arg);
err = loop_reconfigure_limits(lo, arg, false);
loop_update_dio(lo);
blk_mq_unfreeze_queue(lo->lo_queue);