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copy: remove some dead code

This commit is contained in:
Thomas Schoebel-Theuer 2024-06-12 13:32:42 +02:00
parent 31b1a599b8
commit 2a62b1e514
1 changed files with 0 additions and 76 deletions
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76
kernel/mars_copy.c
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@ -128,42 +128,6 @@ void clear_clash(struct copy_brick *brick)
cmpxchg(&brick->clash, true, false);
}
/* Current semantics (NOT REALLY IMPLEMENTED because OUTPUT IS NOT IN USE)
*
* All writes from the OUTPUT are always going to the original input A. They are _not_
* replicated to B.
*
* In order to get B really uptodate, you have to replay the right
* transaction logs there (at the right time).
* [If you had no writes on A at all during the copy, of course
* this is not necessary]
*
* When utilize_mode is on, reads can utilize the already copied
* region from B, but only as long as this region has not been
* invalidated by writes (indicated by low_dirty).
*
* TODO: implement replicated writes, together with some transaction
* replay logic applying the transaction logs _only_ after
* crashes during inconsistency caused by partial replication of writes.
*/
static
struct copy_input *_determine_input(struct copy_brick *brick, struct mref_object *mref)
{
struct copy_mref_aspect *mref_a;
mref_a = copy_mref_get_aspect(brick, mref);
if (unlikely(!mref_a)) {
MARS_FAT("cannot get own aspect from %p %p\n",
brick, mref);
return NULL;
}
/* TODO: implement the new logic, for the envisioned
* new use cases.
*/
return mref_a->input;
}
#define GET_INDEX(pos) (((__u64)(pos) / COPY_CHUNK) % NR_COPY_REQUESTS)
#define GET_OFFSET(pos) ((__u64)(pos) % COPY_CHUNK)
@ -1198,43 +1162,6 @@ static int copy_get_info(struct copy_output *output, struct mars_info *info)
return GENERIC_INPUT_CALL(input, mars_get_info, info);
}
static int copy_ref_get(struct copy_output *output, struct mref_object *mref)
{
struct copy_input *input;
int status;
input = _determine_input(output->brick, mref);
status = GENERIC_INPUT_CALL(input, mref_get, mref);
if (status >= 0) {
atomic_inc(&output->brick->io_flight);
}
return status;
}
static void copy_ref_put(struct copy_output *output, struct mref_object *mref)
{
struct copy_brick *brick = output->brick;
struct copy_input *input;
input = _determine_input(brick, mref);
GENERIC_INPUT_CALL_VOID(input, mref_put, mref);
if (atomic_dec_and_test(&brick->io_flight)) {
WRITE_ONCE(brick->trigger, true);
brick_wake_smp(&brick->event);
}
}
static void copy_ref_io(struct copy_output *output, struct mref_object *mref)
{
struct copy_input *input;
input = _determine_input(output->brick, mref);
GENERIC_INPUT_CALL_VOID(input, mref_io, mref);
}
static int copy_switch(struct copy_brick *brick)
{
static int version = 0;
@ -1456,9 +1383,6 @@ static struct copy_brick_ops copy_brick_ops = {
static struct copy_output_ops copy_output_ops = {
.mars_get_info = copy_get_info,
.mref_get = copy_ref_get,
.mref_put = copy_ref_put,
.mref_io = copy_ref_io,
};
const struct copy_input_type copy_input_type = {