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dm bufio: add sector start offset to dm-bufio interface

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Introduce dm_bufio_set_sector_offset() interface to allow setting a
sector offset for a dm-bufio client.  This is a prereq for the DM
integrity target.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Milan Broz <gmazyland@gmail.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mikulas Patocka 2017-01-04 20:23:52 +01:00 • committed by Mike Snitzer
parent 9b4b5a797c
commit 400a0befc9
2 changed files with 39 additions and 19 deletions
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51
drivers/md/dm-bufio.c
View file

@ -110,6 +110,8 @@ struct dm_bufio_client {
struct rb_root buffer_tree;
wait_queue_head_t free_buffer_wait;
sector_t start;
int async_write_error;
struct list_head client_list;
@ -557,8 +559,8 @@ static void dmio_complete(unsigned long error, void *context)
b->bio.bi_end_io(&b->bio);
}
static void use_dmio(struct dm_buffer *b, int rw, sector_t block,
bio_end_io_t *end_io)
static void use_dmio(struct dm_buffer *b, int rw, sector_t sector,
unsigned n_sectors, bio_end_io_t *end_io)
{
int r;
struct dm_io_request io_req = {
@ -570,8 +572,8 @@ static void use_dmio(struct dm_buffer *b, int rw, sector_t block,
};
struct dm_io_region region = {
.bdev = b->c->bdev,
.sector = block << b->c->sectors_per_block_bits,
.count = b->c->block_size >> SECTOR_SHIFT,
.sector = sector,
.count = n_sectors,
};
if (b->data_mode != DATA_MODE_VMALLOC) {
@ -606,14 +608,14 @@ static void inline_endio(struct bio *bio)
end_fn(bio);
}
static void use_inline_bio(struct dm_buffer *b, int rw, sector_t block,
bio_end_io_t *end_io)
static void use_inline_bio(struct dm_buffer *b, int rw, sector_t sector,
unsigned n_sectors, bio_end_io_t *end_io)
{
char *ptr;
int len;
bio_init(&b->bio, b->bio_vec, DM_BUFIO_INLINE_VECS);
b->bio.bi_iter.bi_sector = block << b->c->sectors_per_block_bits;
b->bio.bi_iter.bi_sector = sector;
b->bio.bi_bdev = b->c->bdev;
b->bio.bi_end_io = inline_endio;
/*
@ -628,7 +630,7 @@ static void use_inline_bio(struct dm_buffer *b, int rw, sector_t block,
* If len < PAGE_SIZE the buffer doesn't cross page boundary.
*/
ptr = b->data;
len = b->c->block_size;
len = n_sectors << SECTOR_SHIFT;
if (len >= PAGE_SIZE)
BUG_ON((unsigned long)ptr & (PAGE_SIZE - 1));
@ -640,7 +642,7 @@ static void use_inline_bio(struct dm_buffer *b, int rw, sector_t block,
len < PAGE_SIZE ? len : PAGE_SIZE,
offset_in_page(ptr))) {
BUG_ON(b->c->block_size <= PAGE_SIZE);
use_dmio(b, rw, block, end_io);
use_dmio(b, rw, sector, n_sectors, end_io);
return;
}
@ -651,17 +653,22 @@ static void use_inline_bio(struct dm_buffer *b, int rw, sector_t block,
submit_bio(&b->bio);
}
static void submit_io(struct dm_buffer *b, int rw, sector_t block,
bio_end_io_t *end_io)
static void submit_io(struct dm_buffer *b, int rw, bio_end_io_t *end_io)
{
unsigned n_sectors;
sector_t sector;
if (rw == WRITE && b->c->write_callback)
b->c->write_callback(b);
if (b->c->block_size <= DM_BUFIO_INLINE_VECS * PAGE_SIZE &&
sector = (b->block << b->c->sectors_per_block_bits) + b->c->start;
n_sectors = 1 << b->c->sectors_per_block_bits;
if (n_sectors <= ((DM_BUFIO_INLINE_VECS * PAGE_SIZE) >> SECTOR_SHIFT) &&
b->data_mode != DATA_MODE_VMALLOC)
use_inline_bio(b, rw, block, end_io);
use_inline_bio(b, rw, sector, n_sectors, end_io);
else
use_dmio(b, rw, block, end_io);
use_dmio(b, rw, sector, n_sectors, end_io);
}
/*----------------------------------------------------------------
@ -713,7 +720,7 @@ static void __write_dirty_buffer(struct dm_buffer *b,
wait_on_bit_lock_io(&b->state, B_WRITING, TASK_UNINTERRUPTIBLE);
if (!write_list)
submit_io(b, WRITE, b->block, write_endio);
submit_io(b, WRITE, write_endio);
else
list_add_tail(&b->write_list, write_list);
}
@ -726,7 +733,7 @@ static void __flush_write_list(struct list_head *write_list)
struct dm_buffer *b =
list_entry(write_list->next, struct dm_buffer, write_list);
list_del(&b->write_list);
submit_io(b, WRITE, b->block, write_endio);
submit_io(b, WRITE, write_endio);
cond_resched();
}
blk_finish_plug(&plug);
@ -1094,7 +1101,7 @@ static void *new_read(struct dm_bufio_client *c, sector_t block,
return NULL;
if (need_submit)
submit_io(b, READ, b->block, read_endio);
submit_io(b, READ, read_endio);
wait_on_bit_io(&b->state, B_READING, TASK_UNINTERRUPTIBLE);
@ -1164,7 +1171,7 @@ void dm_bufio_prefetch(struct dm_bufio_client *c,
dm_bufio_unlock(c);
if (need_submit)
submit_io(b, READ, b->block, read_endio);
submit_io(b, READ, read_endio);
dm_bufio_release(b);
cond_resched();
@ -1405,7 +1412,7 @@ retry:
old_block = b->block;
__unlink_buffer(b);
__link_buffer(b, new_block, b->list_mode);
submit_io(b, WRITE, new_block, write_endio);
submit_io(b, WRITE, write_endio);
wait_on_bit_io(&b->state, B_WRITING,
TASK_UNINTERRUPTIBLE);
__unlink_buffer(b);
@ -1762,6 +1769,12 @@ void dm_bufio_client_destroy(struct dm_bufio_client *c)
}
EXPORT_SYMBOL_GPL(dm_bufio_client_destroy);
void dm_bufio_set_sector_offset(struct dm_bufio_client *c, sector_t start)
{
c->start = start;
}
EXPORT_SYMBOL_GPL(dm_bufio_set_sector_offset);
static unsigned get_max_age_hz(void)
{
unsigned max_age = ACCESS_ONCE(dm_bufio_max_age);

7
drivers/md/dm-bufio.h
View file

@ -31,6 +31,13 @@ dm_bufio_client_create(struct block_device *bdev, unsigned block_size,
*/
void dm_bufio_client_destroy(struct dm_bufio_client *c);
/*
* Set the sector range.
* When this function is called, there must be no I/O in progress on the bufio
* client.
*/
void dm_bufio_set_sector_offset(struct dm_bufio_client *c, sector_t start);
/*
* WARNING: to avoid deadlocks, these conditions are observed:
*