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dm: fix bio_set allocation

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The use of bioset_init_from_src mean that the pre-allocated pools weren't
used for anything except parameter passing, and the integrity pool
creation got completely lost for the actual live mapped_device.  Fix that
by assigning the actual preallocated dm_md_mempools to the mapped_device
and using that for I/O instead of creating new mempools.

Fixes: 2a2a4c510b ("dm: use bioset_init_from_src() to copy bio_set")
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
This commit is contained in:
Christoph Hellwig 2022-06-08 08:34:06 +02:00 committed by Mike Snitzer
parent f2906aa863
commit 29dec90a0f
5 changed files with 35 additions and 75 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
drivers/md/dm-core.h
View File

@ -33,6 +33,14 @@ struct dm_kobject_holder {
* access their members!
*/
/*
* For mempools pre-allocation at the table loading time.
*/
struct dm_md_mempools {
struct bio_set bs;
struct bio_set io_bs;
};
struct mapped_device {
struct mutex suspend_lock;
@ -110,8 +118,7 @@ struct mapped_device {
/*
* io objects are allocated from here.
*/
struct bio_set io_bs;
struct bio_set bs;
struct dm_md_mempools *mempools;
/* kobject and completion */
struct dm_kobject_holder kobj_holder;

2
drivers/md/dm-rq.c
View File

@ -319,7 +319,7 @@ static int setup_clone(struct request *clone, struct request *rq,
{
int r;
r = blk_rq_prep_clone(clone, rq, &tio->md->bs, gfp_mask,
r = blk_rq_prep_clone(clone, rq, &tio->md->mempools->bs, gfp_mask,
dm_rq_bio_constructor, tio);
if (r)
return r;

11
drivers/md/dm-table.c
View File

@ -1038,17 +1038,6 @@ static int dm_table_alloc_md_mempools(struct dm_table *t, struct mapped_device *
return 0;
}
void dm_table_free_md_mempools(struct dm_table *t)
{
dm_free_md_mempools(t->mempools);
t->mempools = NULL;
}
struct dm_md_mempools *dm_table_get_md_mempools(struct dm_table *t)
{
return t->mempools;
}
static int setup_indexes(struct dm_table *t)
{
int i;

84
drivers/md/dm.c
View File

@ -136,14 +136,6 @@ static int get_swap_bios(void)
return latch;
}
/*
* For mempools pre-allocation at the table loading time.
*/
struct dm_md_mempools {
struct bio_set bs;
struct bio_set io_bs;
};
struct table_device {
struct list_head list;
refcount_t count;
@ -581,7 +573,7 @@ static struct dm_io *alloc_io(struct mapped_device *md, struct bio *bio)
struct dm_target_io *tio;
struct bio *clone;
clone = bio_alloc_clone(NULL, bio, GFP_NOIO, &md->io_bs);
clone = bio_alloc_clone(NULL, bio, GFP_NOIO, &md->mempools->io_bs);
/* Set default bdev, but target must bio_set_dev() before issuing IO */
clone->bi_bdev = md->disk->part0;
@ -628,7 +620,8 @@ static struct bio *alloc_tio(struct clone_info *ci, struct dm_target *ti,
} else {
struct mapped_device *md = ci->io->md;
clone = bio_alloc_clone(NULL, ci->bio, gfp_mask, &md->bs);
clone = bio_alloc_clone(NULL, ci->bio, gfp_mask,
&md->mempools->bs);
if (!clone)
return NULL;
/* Set default bdev, but target must bio_set_dev() before issuing IO */
@ -1876,8 +1869,7 @@ static void cleanup_mapped_device(struct mapped_device *md)
{
if (md->wq)
destroy_workqueue(md->wq);
bioset_exit(&md->bs);
bioset_exit(&md->io_bs);
dm_free_md_mempools(md->mempools);
if (md->dax_dev) {
dax_remove_host(md->disk);
@ -2049,48 +2041,6 @@ static void free_dev(struct mapped_device *md)
kvfree(md);
}
static int __bind_mempools(struct mapped_device *md, struct dm_table *t)
{
struct dm_md_mempools *p = dm_table_get_md_mempools(t);
int ret = 0;
if (dm_table_bio_based(t)) {
/*
* The md may already have mempools that need changing.
* If so, reload bioset because front_pad may have changed
* because a different table was loaded.
*/
bioset_exit(&md->bs);
bioset_exit(&md->io_bs);
} else if (bioset_initialized(&md->bs)) {
/*
* There's no need to reload with request-based dm
* because the size of front_pad doesn't change.
* Note for future: If you are to reload bioset,
* prep-ed requests in the queue may refer
* to bio from the old bioset, so you must walk
* through the queue to unprep.
*/
goto out;
}
BUG_ON(!p ||
bioset_initialized(&md->bs) ||
bioset_initialized(&md->io_bs));
ret = bioset_init_from_src(&md->bs, &p->bs);
if (ret)
goto out;
ret = bioset_init_from_src(&md->io_bs, &p->io_bs);
if (ret)
bioset_exit(&md->bs);
out:
/* mempool bind completed, no longer need any mempools in the table */
dm_table_free_md_mempools(t);
return ret;
}
/*
* Bind a table to the device.
*/
@ -2144,12 +2094,28 @@ static struct dm_table *__bind(struct mapped_device *md, struct dm_table *t,
* immutable singletons - used to optimize dm_mq_queue_rq.
*/
md->immutable_target = dm_table_get_immutable_target(t);
}
ret = __bind_mempools(md, t);
if (ret) {
old_map = ERR_PTR(ret);
goto out;
/*
* There is no need to reload with request-based dm because the
* size of front_pad doesn't change.
*
* Note for future: If you are to reload bioset, prep-ed
* requests in the queue may refer to bio from the old bioset,
* so you must walk through the queue to unprep.
*/
if (!md->mempools) {
md->mempools = t->mempools;
t->mempools = NULL;
}
} else {
/*
* The md may already have mempools that need changing.
* If so, reload bioset because front_pad may have changed
* because a different table was loaded.
*/
dm_free_md_mempools(md->mempools);
md->mempools = t->mempools;
t->mempools = NULL;
}
ret = dm_table_set_restrictions(t, md->queue, limits);

2
drivers/md/dm.h
View File

@ -71,8 +71,6 @@ struct dm_target *dm_table_get_immutable_target(struct dm_table *t);
struct dm_target *dm_table_get_wildcard_target(struct dm_table *t);
bool dm_table_bio_based(struct dm_table *t);
bool dm_table_request_based(struct dm_table *t);
void dm_table_free_md_mempools(struct dm_table *t);
struct dm_md_mempools *dm_table_get_md_mempools(struct dm_table *t);
void dm_lock_md_type(struct mapped_device *md);
void dm_unlock_md_type(struct mapped_device *md);