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block: add a max_user_discard_sectors queue limit 

Add a new max_user_discard_sectors limit that mirrors max_user_sectors
and stores the value that the user manually set.  This now allows
updates of the max_hw_discard_sectors to not worry about the user
limit.

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: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Link: https://lore.kernel.org/r/20240213073425.1621680-7-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2024-02-13 08:34:16 +01:00 committed by Jens Axboe
parent 0327ca9d53
commit 4f563a6473
3 changed files with 24 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
block/blk-settings.c
View File

@ -51,6 +51,7 @@ void blk_set_stacking_limits(struct queue_limits *lim)
lim->max_dev_sectors = UINT_MAX;
lim->max_write_zeroes_sectors = UINT_MAX;
lim->max_zone_append_sectors = UINT_MAX;
lim->max_user_discard_sectors = UINT_MAX;
}
EXPORT_SYMBOL(blk_set_stacking_limits);
@ -162,7 +163,9 @@ static int blk_validate_limits(struct queue_limits *lim)
if (!lim->max_segments)
lim->max_segments = BLK_MAX_SEGMENTS;
lim->max_discard_sectors = lim->max_hw_discard_sectors;
lim->max_discard_sectors =
min(lim->max_hw_discard_sectors, lim->max_user_discard_sectors);
if (!lim->max_discard_segments)
lim->max_discard_segments = 1;
@ -228,6 +231,12 @@ static int blk_validate_limits(struct queue_limits *lim)
*/
int blk_set_default_limits(struct queue_limits *lim)
{
/*
* Most defaults are set by capping the bounds in blk_validate_limits,
* but max_user_discard_sectors is special and needs an explicit
* initialization to the max value here.
*/
lim->max_user_discard_sectors = UINT_MAX;
return blk_validate_limits(lim);
}
@ -349,8 +358,11 @@ EXPORT_SYMBOL(blk_queue_chunk_sectors);
void blk_queue_max_discard_sectors(struct request_queue *q,
unsigned int max_discard_sectors)
{
q->limits.max_hw_discard_sectors = max_discard_sectors;
q->limits.max_discard_sectors = max_discard_sectors;
struct queue_limits *lim = &q->limits;
lim->max_hw_discard_sectors = max_discard_sectors;
lim->max_discard_sectors =
min(max_discard_sectors, lim->max_user_discard_sectors);
}
EXPORT_SYMBOL(blk_queue_max_discard_sectors);

17
block/blk-sysfs.c
View File

@ -174,23 +174,22 @@ static ssize_t queue_discard_max_show(struct request_queue *q, char *page)
static ssize_t queue_discard_max_store(struct request_queue *q,
const char *page, size_t count)
{
unsigned long max_discard;
ssize_t ret = queue_var_store(&max_discard, page, count);
unsigned long max_discard_bytes;
ssize_t ret;
ret = queue_var_store(&max_discard_bytes, page, count);
if (ret < 0)
return ret;
if (max_discard & (q->limits.discard_granularity - 1))
if (max_discard_bytes & (q->limits.discard_granularity - 1))
return -EINVAL;
max_discard >>= 9;
if (max_discard > UINT_MAX)
if ((max_discard_bytes >> SECTOR_SHIFT) > UINT_MAX)
return -EINVAL;
if (max_discard > q->limits.max_hw_discard_sectors)
max_discard = q->limits.max_hw_discard_sectors;
q->limits.max_discard_sectors = max_discard;
q->limits.max_user_discard_sectors = max_discard_bytes >> SECTOR_SHIFT;
q->limits.max_discard_sectors = min(q->limits.max_hw_discard_sectors,
q->limits.max_user_discard_sectors);
return ret;
}

1
include/linux/blkdev.h
View File

@ -291,6 +291,7 @@ struct queue_limits {
unsigned int io_opt;
unsigned int max_discard_sectors;
unsigned int max_hw_discard_sectors;
unsigned int max_user_discard_sectors;
unsigned int max_secure_erase_sectors;
unsigned int max_write_zeroes_sectors;
unsigned int max_zone_append_sectors;