introduce a per-target bit "flush_pass_around" and means that the target supports flush optimization. set a per-table "flush_pass_around" bit if all the targets in the table have "flush_pass_around" set.
Signed-off-by: Yang Yang <[email protected]> --- drivers/md/dm-core.h | 3 +++ drivers/md/dm-ioctl.c | 4 ++++ drivers/md/dm-table.c | 3 +++ include/linux/device-mapper.h | 5 +++++ 4 files changed, 15 insertions(+) diff --git a/drivers/md/dm-core.h b/drivers/md/dm-core.h index e6757a30dcca..b273f25b634d 100644 --- a/drivers/md/dm-core.h +++ b/drivers/md/dm-core.h @@ -208,6 +208,9 @@ struct dm_table { bool singleton:1; unsigned integrity_added:1; + /* set if all the targets in the table have "flush_pass_around" set */ + bool flush_pass_around:1; + /* * Indicates the rw permissions for the new logical device. This * should be a combination of BLK_OPEN_READ and BLK_OPEN_WRITE. diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c index c2c07bfa6471..bb178df2a340 100644 --- a/drivers/md/dm-ioctl.c +++ b/drivers/md/dm-ioctl.c @@ -1445,6 +1445,8 @@ static int populate_table(struct dm_table *table, return -EINVAL; } + table->flush_pass_around = 1; + for (i = 0; i < param->target_count; i++) { const char *nul_terminator; @@ -2279,6 +2281,8 @@ int __init dm_early_create(struct dm_ioctl *dmi, if (r) goto err_hash_remove; + t->flush_pass_around = 1; + /* add targets */ for (i = 0; i < dmi->target_count; i++) { r = dm_table_add_target(t, spec_array[i]->target_type, diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c index 41f1d731ae5a..bd68af10afed 100644 --- a/drivers/md/dm-table.c +++ b/drivers/md/dm-table.c @@ -738,6 +738,9 @@ int dm_table_add_target(struct dm_table *t, const char *type, if (ti->limit_swap_bios && !static_key_enabled(&swap_bios_enabled.key)) static_branch_enable(&swap_bios_enabled); + if (ti->flush_pass_around == 0) + t->flush_pass_around = 0; + return 0; bad: diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h index 82b2195efaca..0893ff8c01b6 100644 --- a/include/linux/device-mapper.h +++ b/include/linux/device-mapper.h @@ -397,6 +397,11 @@ struct dm_target { * bio_set_dev(). NOTE: ideally a target should _not_ need this. */ bool needs_bio_set_dev:1; + + /* + * Set if the target supports flush optimization + */ + bool flush_pass_around:1; }; void *dm_per_bio_data(struct bio *bio, size_t data_size); -- 2.34.1
