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authorNeilBrown <neilb@suse.com>2017-11-22 06:25:18 +0300
committerMike Snitzer <snitzer@redhat.com>2017-12-13 20:15:58 +0300
commitf31c21e4365c02ccf7226c33ea978cd5dbfc351e (patch)
tree26dd1f16a7996339e872af8bb3702d7c713e02af /include/linux/device-mapper.h
parent18a25da84354c6bb655320de6072c00eda6eb602 (diff)
downloadlinux-f31c21e4365c02ccf7226c33ea978cd5dbfc351e.tar.xz
dm: remove unused 'num_write_bios' target interface
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>
Diffstat (limited to 'include/linux/device-mapper.h')
-rw-r--r--include/linux/device-mapper.h15
1 files changed, 0 insertions, 15 deletions
diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
index a5538433c927..5a68b366e664 100644
--- a/include/linux/device-mapper.h
+++ b/include/linux/device-mapper.h
@@ -221,14 +221,6 @@ struct target_type {
#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.
*/
#define DM_TARGET_INTEGRITY 0x00000010
@@ -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;