Release 4.14 drivers/md/dm-io.c

/*
 * Copyright (C) 2003 Sistina Software
 * Copyright (C) 2006 Red Hat GmbH
 *
 * This file is released under the GPL.
 */

#include "dm-core.h"

#include <linux/device-mapper.h>

#include <linux/bio.h>
#include <linux/completion.h>
#include <linux/mempool.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/dm-io.h>


#define DM_MSG_PREFIX "io"


#define DM_IO_MAX_REGIONS	BITS_PER_LONG


struct dm_io_client {
	
mempool_t *pool;
	
struct bio_set *bios;
};

/*
 * Aligning 'struct io' reduces the number of bits required to store
 * its address.  Refer to store_io_and_region_in_bio() below.
 */

struct io {
	
unsigned long error_bits;
	
atomic_t count;
	
struct dm_io_client *client;
	
io_notify_fn callback;
	
void *context;
	
void *vma_invalidate_address;
	
unsigned long vma_invalidate_size;
} __attribute__((aligned(DM_IO_MAX_REGIONS)));


static struct kmem_cache *_dm_io_cache;

/*
 * Create a client with mempool and bioset.
 */


struct dm_io_client *dm_io_client_create(void)
{
	struct dm_io_client *client;
	unsigned min_ios = dm_get_reserved_bio_based_ios();

	client = kmalloc(sizeof(*client), GFP_KERNEL);
	if (!client)
		return ERR_PTR(-ENOMEM);

	client->pool = mempool_create_slab_pool(min_ios, _dm_io_cache);
	if (!client->pool)
		goto bad;

	client->bios = bioset_create(min_ios, 0, (BIOSET_NEED_BVECS |
						  BIOSET_NEED_RESCUER));
	if (!client->bios)
		goto bad;

	return client;

   bad:
	mempool_destroy(client->pool);
	kfree(client);
	return ERR_PTR(-ENOMEM);
}
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Heinz Mauelshagen
99
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1
14.29%
Mike Snitzer
8
6.84%
1
14.29%
Neil Brown
6
5.13%
2
28.57%
Mikulas Patocka
3
2.56%
2
28.57%
Jens Axboe
1
0.85%
1
14.29%
Total
117
100.00%
7
100.00%


EXPORT_SYMBOL(dm_io_client_create);



void dm_io_client_destroy(struct dm_io_client *client)
{
	mempool_destroy(client->pool);
	bioset_free(client->bios);
	kfree(client);
}
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29
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EXPORT_SYMBOL(dm_io_client_destroy);

/*-----------------------------------------------------------------
 * We need to keep track of which region a bio is doing io for.
 * To avoid a memory allocation to store just 5 or 6 bits, we
 * ensure the 'struct io' pointer is aligned so enough low bits are
 * always zero and then combine it with the region number directly in
 * bi_private.
 *---------------------------------------------------------------*/


static void store_io_and_region_in_bio(struct bio *bio, struct io *io,
				       unsigned region)
{
	if (unlikely(!IS_ALIGNED((unsigned long)io, DM_IO_MAX_REGIONS))) {
		DMCRIT("Unaligned struct io pointer %p", io);
		BUG();
	}

	bio->bi_private = (void *)((unsigned long)io | region);
}

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Mikulas Patocka
48
72.73%
1
50.00%
Alasdair G. Kergon
18
27.27%
1
50.00%
Total
66
100.00%
2
100.00%



static void retrieve_io_and_region_from_bio(struct bio *bio, struct io **io,
				       unsigned *region)
{
	unsigned long val = (unsigned long)bio->bi_private;

	*io = (void *)(val & -(unsigned long)DM_IO_MAX_REGIONS);
	*region = val & (DM_IO_MAX_REGIONS - 1);
}

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Mikulas Patocka
51
82.26%
1
50.00%
Alasdair G. Kergon
11
17.74%
1
50.00%
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62
100.00%
2
100.00%

/*-----------------------------------------------------------------
 * We need an io object to keep track of the number of bios that
 * have been dispatched for a particular io.
 *---------------------------------------------------------------*/


static void complete_io(struct io *io)
{
	unsigned long error_bits = io->error_bits;
	io_notify_fn fn = io->callback;
	void *context = io->context;

	if (io->vma_invalidate_size)
		invalidate_kernel_vmap_range(io->vma_invalidate_address,
					     io->vma_invalidate_size);

	mempool_free(io, io->client->pool);
	fn(error_bits, context);
}

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Alasdair G. Kergon
44
63.77%
3
50.00%
Joe Thornber
20
28.99%
1
16.67%
Heinz Mauelshagen
3
4.35%
1
16.67%
Milan Broz
2
2.90%
1
16.67%
Total
69
100.00%
6
100.00%



static void dec_count(struct io *io, unsigned int region, blk_status_t error)
{
	if (error)
		set_bit(region, &io->error_bits);

	if (atomic_dec_and_test(&io->count))
		complete_io(io);
}

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Joe Thornber
45
95.74%
1
33.33%
Christoph Hellwig
1
2.13%
1
33.33%
Alasdair G. Kergon
1
2.13%
1
33.33%
Total
47
100.00%
3
100.00%



static void endio(struct bio *bio)
{
	struct io *io;
	unsigned region;
	blk_status_t error;

	if (bio->bi_status && bio_data_dir(bio) == READ)
		zero_fill_bio(bio);

	/*
         * The bio destructor in bio_put() may use the io object.
         */
	retrieve_io_and_region_from_bio(bio, &io, &region);

	error = bio->bi_status;
	bio_put(bio);

	dec_count(io, region, error);
}

Contributors
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Alasdair G. Kergon
39
54.17%
1
14.29%
Heinz Mauelshagen
12
16.67%
1
14.29%
Sasha Levin
8
11.11%
1
14.29%
Mikulas Patocka
7
9.72%
1
14.29%
Christoph Hellwig
5
6.94%
2
28.57%
Neil Brown
1
1.39%
1
14.29%
Total
72
100.00%
7
100.00%

/*-----------------------------------------------------------------
 * These little objects provide an abstraction for getting a new
 * destination page for io.
 *---------------------------------------------------------------*/

struct dpages {
	
void (*get_page)(struct dpages *dp,
			 struct page **p, unsigned long *len, unsigned *offset);
	
void (*next_page)(struct dpages *dp);

	union {
		
unsigned context_u;
		
struct bvec_iter context_bi;
	};
	
void *context_ptr;

	
void *vma_invalidate_address;
	
unsigned long vma_invalidate_size;
};

/*
 * Functions for getting the pages from a list.
 */


static void list_get_page(struct dpages *dp,
		  struct page **p, unsigned long *len, unsigned *offset)
{
	unsigned o = dp->context_u;
	struct page_list *pl = (struct page_list *) dp->context_ptr;

	*p = pl->page;
	*len = PAGE_SIZE - o;
	*offset = o;
}

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Alasdair G. Kergon
66
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1
100.00%
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66
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1
100.00%



static void list_next_page(struct dpages *dp)
{
	struct page_list *pl = (struct page_list *) dp->context_ptr;
	dp->context_ptr = pl->next;
	dp->context_u = 0;
}

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Alasdair G. Kergon
39
100.00%
1
100.00%
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39
100.00%
1
100.00%



static void list_dp_init(struct dpages *dp, struct page_list *pl, unsigned offset)
{
	dp->get_page = list_get_page;
	dp->next_page = list_next_page;
	dp->context_u = offset;
	dp->context_ptr = pl;
}

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Alasdair G. Kergon
43
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1
100.00%
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43
100.00%
1
100.00%

/*
 * Functions for getting the pages from a bvec.
 */


static void bio_get_page(struct dpages *dp, struct page **p,
			 unsigned long *len, unsigned *offset)
{
	struct bio_vec bvec = bvec_iter_bvec((struct bio_vec *)dp->context_ptr,
					     dp->context_bi);

	*p = bvec.bv_page;
	*len = bvec.bv_len;
	*offset = bvec.bv_offset;

	/* avoid figuring it out again in bio_next_page() */
	dp->context_bi.bi_sector = (sector_t)bvec.bv_len;
}

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Alasdair G. Kergon
49
60.49%
1
25.00%
Lei Ming
27
33.33%
1
25.00%
Mikulas Patocka
4
4.94%
1
25.00%
Kent Overstreet
1
1.23%
1
25.00%
Total
81
100.00%
4
100.00%



static void bio_next_page(struct dpages *dp)
{
	unsigned int len = (unsigned int)dp->context_bi.bi_sector;

	bvec_iter_advance((struct bio_vec *)dp->context_ptr,
			  &dp->context_bi, len);
}

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Lei Ming
23
52.27%
1
25.00%
Alasdair G. Kergon
15
34.09%
1
25.00%
Mikulas Patocka
5
11.36%
1
25.00%
Kent Overstreet
1
2.27%
1
25.00%
Total
44
100.00%
4
100.00%



static void bio_dp_init(struct dpages *dp, struct bio *bio)
{
	dp->get_page = bio_get_page;
	dp->next_page = bio_next_page;

	/*
         * We just use bvec iterator to retrieve pages, so it is ok to
         * access the bvec table directly here
         */
	dp->context_ptr = bio->bi_io_vec;
	dp->context_bi = bio->bi_iter;
}

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Alasdair G. Kergon
28
62.22%
1
25.00%
Mikulas Patocka
9
20.00%
1
25.00%
Kent Overstreet
6
13.33%
1
25.00%
Lei Ming
2
4.44%
1
25.00%
Total
45
100.00%
4
100.00%

/*
 * Functions for getting the pages from a VMA.
 */


static void vm_get_page(struct dpages *dp,
		 struct page **p, unsigned long *len, unsigned *offset)
{
	*p = vmalloc_to_page(dp->context_ptr);
	*offset = dp->context_u;
	*len = PAGE_SIZE - dp->context_u;
}

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52
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1
100.00%



static void vm_next_page(struct dpages *dp)
{
	dp->context_ptr += PAGE_SIZE - dp->context_u;
	dp->context_u = 0;
}

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27
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1
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27
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1
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static void vm_dp_init(struct dpages *dp, void *data)
{
	dp->get_page = vm_get_page;
	dp->next_page = vm_next_page;
	dp->context_u = offset_in_page(data);
	dp->context_ptr = data;
}

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Alasdair G. Kergon
39
92.86%
1
50.00%
Al Viro
3
7.14%
1
50.00%
Total
42
100.00%
2
100.00%

/*
 * Functions for getting the pages from kernel memory.
 */


static void km_get_page(struct dpages *dp, struct page **p, unsigned long *len,
			unsigned *offset)
{
	*p = virt_to_page(dp->context_ptr);
	*offset = dp->context_u;
	*len = PAGE_SIZE - dp->context_u;
}

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Heinz Mauelshagen
52
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1
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52
100.00%
1
100.00%



static void km_next_page(struct dpages *dp)
{
	dp->context_ptr += PAGE_SIZE - dp->context_u;
	dp->context_u = 0;
}

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100.00%
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27
100.00%
1
100.00%



static void km_dp_init(struct dpages *dp, void *data)
{
	dp->get_page = km_get_page;
	dp->next_page = km_next_page;
	dp->context_u = offset_in_page(data);
	dp->context_ptr = data;
}

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Heinz Mauelshagen
39
92.86%
1
50.00%
Al Viro
3
7.14%
1
50.00%
Total
42
100.00%
2
100.00%

/*-----------------------------------------------------------------
 * IO routines that accept a list of pages.
 *---------------------------------------------------------------*/


static void do_region(int op, int op_flags, unsigned region,
		      struct dm_io_region *where, struct dpages *dp,
		      struct io *io)
{
	struct bio *bio;
	struct page *page;
	unsigned long len;
	unsigned offset;
	unsigned num_bvecs;
	sector_t remaining = where->count;
	struct request_queue *q = bdev_get_queue(where->bdev);
	unsigned short logical_block_size = queue_logical_block_size(q);
	sector_t num_sectors;
	unsigned int uninitialized_var(special_cmd_max_sectors);

	/*
         * Reject unsupported discard and write same requests.
         */
	if (op == REQ_OP_DISCARD)
		special_cmd_max_sectors = q->limits.max_discard_sectors;
	else if (op == REQ_OP_WRITE_ZEROES)
		special_cmd_max_sectors = q->limits.max_write_zeroes_sectors;
	else if (op == REQ_OP_WRITE_SAME)
		special_cmd_max_sectors = q->limits.max_write_same_sectors;
	if ((op == REQ_OP_DISCARD || op == REQ_OP_WRITE_ZEROES ||
	     op == REQ_OP_WRITE_SAME) && special_cmd_max_sectors == 0) {
		atomic_inc(&io->count);
		dec_count(io, region, BLK_STS_NOTSUPP);
		return;
	}

	/*
         * where->count may be zero if op holds a flush and we need to
         * send a zero-sized flush.
         */
	do {
		/*
                 * Allocate a suitably sized-bio.
                 */
		switch (op) {
		case REQ_OP_DISCARD:
		case REQ_OP_WRITE_ZEROES:
			num_bvecs = 0;
			break;
		case REQ_OP_WRITE_SAME:
			num_bvecs = 1;
			break;
		default:
			num_bvecs = min_t(int, BIO_MAX_PAGES,
					  dm_sector_div_up(remaining, (PAGE_SIZE >> SECTOR_SHIFT)));
		}

		bio = bio_alloc_bioset(GFP_NOIO, num_bvecs, io->client->bios);
		bio->bi_iter.bi_sector = where->sector + (where->count - remaining);
		bio_set_dev(bio, where->bdev);
		bio->bi_end_io = endio;
		bio_set_op_attrs(bio, op, op_flags);
		store_io_and_region_in_bio(bio, io, region);

		if (op == REQ_OP_DISCARD || op == REQ_OP_WRITE_ZEROES) {
			num_sectors = min_t(sector_t, special_cmd_max_sectors, remaining);
			bio->bi_iter.bi_size = num_sectors << SECTOR_SHIFT;
			remaining -= num_sectors;
		} else if (op == REQ_OP_WRITE_SAME) {
			/*
                         * WRITE SAME only uses a single page.
                         */
			dp->get_page(dp, &page, &len, &offset);
			bio_add_page(bio, page, logical_block_size, offset);
			num_sectors = min_t(sector_t, special_cmd_max_sectors, remaining);
			bio->bi_iter.bi_size = num_sectors << SECTOR_SHIFT;

			offset = 0;
			remaining -= num_sectors;
			dp->next_page(dp);
		} else while (remaining) {
			/*
                         * Try and add as many pages as possible.
                         */
			dp->get_page(dp, &page, &len, &offset);
			len = min(len, to_bytes(remaining));
			if (!bio_add_page(bio, page, len, offset))
				break;

			offset = 0;
			remaining -= to_sector(len);
			dp->next_page(dp);
		}

		atomic_inc(&io->count);
		submit_bio(bio);
	} while (remaining);
}

Contributors
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Alasdair G. Kergon
178
36.55%
1
4.76%
Mike Snitzer
88
18.07%
2
9.52%
Milan Broz
54
11.09%
2
9.52%
Darrick J. Wong
53
10.88%
2
9.52%
Christoph Hellwig
46
9.45%
4
19.05%
Michael Christie
36
7.39%
2
9.52%
Mikulas Patocka
10
2.05%
2
9.52%
Jun'ichi Nomura
9
1.85%
1
4.76%
Kent Overstreet
7
1.44%
2
9.52%
Heinz Mauelshagen
4
0.82%
2
9.52%
Dave Olien
2
0.41%
1
4.76%
Total
487
100.00%
21
100.00%



static void dispatch_io(int op, int op_flags, unsigned int num_regions,
			struct dm_io_region *where, struct dpages *dp,
			struct io *io, int sync)
{
	int i;
	struct dpages old_pages = *dp;

	BUG_ON(num_regions > DM_IO_MAX_REGIONS);

	if (sync)
		op_flags |= REQ_SYNC;

	/*
         * For multiple regions we need to be careful to rewind
         * the dp object for each call to do_region.
         */
	for (i = 0; i < num_regions; i++) {
		*dp = old_pages;
		if (where[i].count || (op_flags & REQ_PREFLUSH))
			do_region(op, op_flags, i, where + i, dp, io);
	}

	/*
         * Drop the extra reference that we were holding to avoid
         * the io being completed too early.
         */
	dec_count(io, 0, 0);
}

Contributors
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Alasdair G. Kergon
98
80.33%
1
12.50%
Mikulas Patocka
11
9.02%
2
25.00%
Michael Christie
10
8.20%
2
25.00%
Heinz Mauelshagen
2
1.64%
2
25.00%
Christoph Hellwig
1
0.82%
1
12.50%
Total
122
100.00%
8
100.00%


struct sync_io {
	
unsigned long error_bits;
	
struct completion wait;
};



static void sync_io_complete(unsigned long error, void *context)
{
	struct sync_io *sio = context;

	sio->error_bits = error;
	complete(&sio->wait);
}

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Joe Thornber
35
100.00%
1
100.00%
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35
100.00%
1
100.00%



static int sync_io(struct dm_io_client *client, unsigned int num_regions,
		   struct dm_io_region *where, int op, int op_flags,
		   struct dpages *dp, unsigned long *error_bits)
{
	struct io *io;
	struct sync_io sio;

	if (num_regions > 1 && !op_is_write(op)) {
		WARN_ON(1);
		return -EIO;
	}

	init_completion(&sio.wait);

	io = mempool_alloc(client->pool, GFP_NOIO);
	io->error_bits = 0;
	atomic_set(&io->count, 1); /* see dispatch_io() */
	io->client = client;
	io->callback = sync_io_complete;
	io->context = &sio;

	io->vma_invalidate_address = dp->vma_invalidate_address;
	io->vma_invalidate_size = dp->vma_invalidate_size;

	dispatch_io(op, op_flags, num_regions, where, dp, io, 1);

	wait_for_completion_io(&sio.wait);

	if (error_bits)
		*error_bits = sio.error_bits;

	return sio.error_bits ? -EIO : 0;
}

Contributors
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CommitProp
Alasdair G. Kergon
87
47.03%
2
18.18%
Joe Thornber
42
22.70%
2
18.18%
Mikulas Patocka
21
11.35%
2
18.18%
Kevin Corry
12
6.49%
1
9.09%
Michael Christie
12
6.49%
2
18.18%
Heinz Mauelshagen
11
5.95%
2
18.18%
Total
185
100.00%
11
100.00%



static int async_io(struct dm_io_client *client, unsigned int num_regions,
		    struct dm_io_region *where, int op, int op_flags,
		    struct dpages *dp, io_notify_fn fn, void *context)
{
	struct io *io;

	if (num_regions > 1 && !op_is_write(op)) {
		WARN_ON(1);
		fn(1, context);
		return -EIO;
	}

	io = mempool_alloc(client->pool, GFP_NOIO);
	io->error_bits = 0;
	atomic_set(&io->count, 1); /* see dispatch_io() */
	io->client = client;
	io->callback = fn;
	io->context = context;

	io->vma_invalidate_address = dp->vma_invalidate_address;
	io->vma_invalidate_size = dp->vma_invalidate_size;

	dispatch_io(op, op_flags, num_regions, where, dp, io, 0);
	return 0;
}

Contributors
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Alasdair G. Kergon
83
53.55%
2
22.22%
Kevin Corry
29
18.71%
1
11.11%
Mikulas Patocka
16
10.32%
1
11.11%
Heinz Mauelshagen
13
8.39%
2
22.22%
Michael Christie
12
7.74%
2
22.22%
Milan Broz
2
1.29%
1
11.11%
Total
155
100.00%
9
100.00%



static int dp_init(struct dm_io_request *io_req, struct dpages *dp,
		   unsigned long size)
{
	/* Set up dpages based on memory type */

	dp->vma_invalidate_address = NULL;
	dp->vma_invalidate_size = 0;

	switch (io_req->mem.type) {
	case DM_IO_PAGE_LIST:
		list_dp_init(dp, io_req->mem.ptr.pl, io_req->mem.offset);
		break;

	case DM_IO_BIO:
		bio_dp_init(dp, io_req->mem.ptr.bio);
		break;

	case DM_IO_VMA:
		flush_kernel_vmap_range(io_req->mem.ptr.vma, size);
		if (io_req->bi_op == REQ_OP_READ) {
			dp->vma_invalidate_address = io_req->mem.ptr.vma;
			dp->vma_invalidate_size = size;
		}
		vm_dp_init(dp, io_req->mem.ptr.vma);
		break;

	case DM_IO_KMEM:
		km_dp_init(dp, io_req->mem.ptr.addr);
		break;

	default:
		return -EINVAL;
	}

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Heinz Mauelshagen
93
56.02%
1
16.67%
Mikulas Patocka
55
33.13%
1
16.67%
Alasdair G. Kergon
7
4.22%
1
16.67%
Milan Broz
6
3.61%
1
16.67%
Kent Overstreet
3
1.81%
1
16.67%
Michael Christie
2
1.20%
1
16.67%
Total
166
100.00%
6
100.00%

/*
 * New collapsed (a)synchronous interface.
 *
 * If the IO is asynchronous (i.e. it has notify.fn), you must either unplug
 * the queue with blk_unplug() some time later or set REQ_SYNC in
 * io_req->bi_opf. If you fail to do one of these, the IO will be submitted to
 * the disk after q->unplug_delay, which defaults to 3ms in blk-settings.c.
 */


int dm_io(struct dm_io_request *io_req, unsigned num_regions,
	  struct dm_io_region *where, unsigned long *sync_error_bits)
{
	int r;
	struct dpages dp;

	r = dp_init(io_req, &dp, (unsigned long)where->count << SECTOR_SHIFT);
	if (r)
		return r;

	if (!io_req->notify.fn)
		return sync_io(io_req->client, num_regions, where,
			       io_req->bi_op, io_req->bi_op_flags, &dp,
			       sync_error_bits);

	return async_io(io_req->client, num_regions, where, io_req->bi_op,
			io_req->bi_op_flags, &dp, io_req->notify.fn,
			io_req->notify.context);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Heinz Mauelshagen
106
84.13%
2
50.00%
Mikulas Patocka
10
7.94%
1
25.00%
Michael Christie
10
7.94%
1
25.00%
Total
126
100.00%
4
100.00%


EXPORT_SYMBOL(dm_io);



int __init dm_io_init(void)
{
	_dm_io_cache = KMEM_CACHE(io, 0);
	if (!_dm_io_cache)
		return -ENOMEM;

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Mikulas Patocka
29
100.00%
1
100.00%
Total
29
100.00%
1
100.00%



void dm_io_exit(void)
{
	kmem_cache_destroy(_dm_io_cache);
	_dm_io_cache = NULL;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Mikulas Patocka
16
100.00%
1
100.00%
Total
16
100.00%
1
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Alasdair G. Kergon
1017
39.95%
4
8.00%
Heinz Mauelshagen
530
20.82%
5
10.00%
Mikulas Patocka
339
13.32%
7
14.00%
Joe Thornber
158
6.21%
2
4.00%
Mike Snitzer
97
3.81%
4
8.00%
Michael Christie
82
3.22%
4
8.00%
Milan Broz
64
2.51%
2
4.00%
Lei Ming
60
2.36%
1
2.00%
Christoph Hellwig
53
2.08%
6
12.00%
Darrick J. Wong
53
2.08%
2
4.00%
Kevin Corry
41
1.61%
1
2.00%
Kent Overstreet
18
0.71%
3
6.00%
Jun'ichi Nomura
9
0.35%
1
2.00%
Sasha Levin
8
0.31%
1
2.00%
Neil Brown
7
0.27%
3
6.00%
Al Viro
6
0.24%
1
2.00%
Dave Olien
2
0.08%
1
2.00%
Jens Axboe
2
0.08%
2
4.00%
Total
2546
100.00%
50
100.00%
Directory: drivers/md

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