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dm: remove unused 'num_write_bios' target interface

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No DM target provides num_write_bios and none has since dm-cache's
brief use in 2013.

Having the possibility of num_write_bios > 1 complicates bio
allocation.  So remove the interface and assume there is only one bio
needed.

If a target ever needs more, it must provide a suitable bioset and
allocate itself based on its particular needs.

Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
NeilBrown 2017-11-22 14:25:18 +11:00 • committed by Mike Snitzer
parent 18a25da843
commit f31c21e436
2 changed files with 10 additions and 35 deletions
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15
include/linux/device-mapper.h
View file

@ -220,14 +220,6 @@ struct target_type {
#define DM_TARGET_WILDCARD 0x00000008
#define dm_target_is_wildcard(type) ((type)->features & DM_TARGET_WILDCARD)
/*
* Some targets need to be sent the same WRITE bio severals times so
* that they can send copies of it to different devices. This function
* examines any supplied bio and returns the number of copies of it the
* target requires.
*/
typedef unsigned (*dm_num_write_bios_fn) (struct dm_target *ti, struct bio *bio);
/*
* A target implements own bio data integrity.
*/
@ -291,13 +283,6 @@ struct dm_target {
*/
unsigned per_io_data_size;
/*
* If defined, this function is called to find out how many
* duplicate bios should be sent to the target when writing
* data.
*/
dm_num_write_bios_fn num_write_bios;
/* target specific data */
void *private;