mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-28 11:18:45 +07:00
6096d91af0
The metadata space map has a simplified 'bootstrap' mode that is operational when extending the space maps. Whilst in this mode it's possible for some refcount decrement operations to become queued (eg, as a result of shadowing one of the bitmap indexes). These decrements were not being applied when switching out of bootstrap mode. The effect of this bug was the leaking of a 4k metadata block. This is detected by the latest version of thin_check as a non fatal error. Signed-off-by: Joe Thornber <ejt@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com> Cc: stable@vger.kernel.org
819 lines
17 KiB
C
819 lines
17 KiB
C
/*
|
|
* Copyright (C) 2011 Red Hat, Inc.
|
|
*
|
|
* This file is released under the GPL.
|
|
*/
|
|
|
|
#include "dm-space-map.h"
|
|
#include "dm-space-map-common.h"
|
|
#include "dm-space-map-metadata.h"
|
|
|
|
#include <linux/list.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/device-mapper.h>
|
|
|
|
#define DM_MSG_PREFIX "space map metadata"
|
|
|
|
/*----------------------------------------------------------------*/
|
|
|
|
/*
|
|
* An edge triggered threshold.
|
|
*/
|
|
struct threshold {
|
|
bool threshold_set;
|
|
bool value_set;
|
|
dm_block_t threshold;
|
|
dm_block_t current_value;
|
|
dm_sm_threshold_fn fn;
|
|
void *context;
|
|
};
|
|
|
|
static void threshold_init(struct threshold *t)
|
|
{
|
|
t->threshold_set = false;
|
|
t->value_set = false;
|
|
}
|
|
|
|
static void set_threshold(struct threshold *t, dm_block_t value,
|
|
dm_sm_threshold_fn fn, void *context)
|
|
{
|
|
t->threshold_set = true;
|
|
t->threshold = value;
|
|
t->fn = fn;
|
|
t->context = context;
|
|
}
|
|
|
|
static bool below_threshold(struct threshold *t, dm_block_t value)
|
|
{
|
|
return t->threshold_set && value <= t->threshold;
|
|
}
|
|
|
|
static bool threshold_already_triggered(struct threshold *t)
|
|
{
|
|
return t->value_set && below_threshold(t, t->current_value);
|
|
}
|
|
|
|
static void check_threshold(struct threshold *t, dm_block_t value)
|
|
{
|
|
if (below_threshold(t, value) &&
|
|
!threshold_already_triggered(t))
|
|
t->fn(t->context);
|
|
|
|
t->value_set = true;
|
|
t->current_value = value;
|
|
}
|
|
|
|
/*----------------------------------------------------------------*/
|
|
|
|
/*
|
|
* Space map interface.
|
|
*
|
|
* The low level disk format is written using the standard btree and
|
|
* transaction manager. This means that performing disk operations may
|
|
* cause us to recurse into the space map in order to allocate new blocks.
|
|
* For this reason we have a pool of pre-allocated blocks large enough to
|
|
* service any metadata_ll_disk operation.
|
|
*/
|
|
|
|
/*
|
|
* FIXME: we should calculate this based on the size of the device.
|
|
* Only the metadata space map needs this functionality.
|
|
*/
|
|
#define MAX_RECURSIVE_ALLOCATIONS 1024
|
|
|
|
enum block_op_type {
|
|
BOP_INC,
|
|
BOP_DEC
|
|
};
|
|
|
|
struct block_op {
|
|
enum block_op_type type;
|
|
dm_block_t block;
|
|
};
|
|
|
|
struct bop_ring_buffer {
|
|
unsigned begin;
|
|
unsigned end;
|
|
struct block_op bops[MAX_RECURSIVE_ALLOCATIONS + 1];
|
|
};
|
|
|
|
static void brb_init(struct bop_ring_buffer *brb)
|
|
{
|
|
brb->begin = 0;
|
|
brb->end = 0;
|
|
}
|
|
|
|
static bool brb_empty(struct bop_ring_buffer *brb)
|
|
{
|
|
return brb->begin == brb->end;
|
|
}
|
|
|
|
static unsigned brb_next(struct bop_ring_buffer *brb, unsigned old)
|
|
{
|
|
unsigned r = old + 1;
|
|
return (r >= (sizeof(brb->bops) / sizeof(*brb->bops))) ? 0 : r;
|
|
}
|
|
|
|
static int brb_push(struct bop_ring_buffer *brb,
|
|
enum block_op_type type, dm_block_t b)
|
|
{
|
|
struct block_op *bop;
|
|
unsigned next = brb_next(brb, brb->end);
|
|
|
|
/*
|
|
* We don't allow the last bop to be filled, this way we can
|
|
* differentiate between full and empty.
|
|
*/
|
|
if (next == brb->begin)
|
|
return -ENOMEM;
|
|
|
|
bop = brb->bops + brb->end;
|
|
bop->type = type;
|
|
bop->block = b;
|
|
|
|
brb->end = next;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int brb_pop(struct bop_ring_buffer *brb, struct block_op *result)
|
|
{
|
|
struct block_op *bop;
|
|
|
|
if (brb_empty(brb))
|
|
return -ENODATA;
|
|
|
|
bop = brb->bops + brb->begin;
|
|
result->type = bop->type;
|
|
result->block = bop->block;
|
|
|
|
brb->begin = brb_next(brb, brb->begin);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*----------------------------------------------------------------*/
|
|
|
|
struct sm_metadata {
|
|
struct dm_space_map sm;
|
|
|
|
struct ll_disk ll;
|
|
struct ll_disk old_ll;
|
|
|
|
dm_block_t begin;
|
|
|
|
unsigned recursion_count;
|
|
unsigned allocated_this_transaction;
|
|
struct bop_ring_buffer uncommitted;
|
|
|
|
struct threshold threshold;
|
|
};
|
|
|
|
static int add_bop(struct sm_metadata *smm, enum block_op_type type, dm_block_t b)
|
|
{
|
|
int r = brb_push(&smm->uncommitted, type, b);
|
|
|
|
if (r) {
|
|
DMERR("too many recursive allocations");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int commit_bop(struct sm_metadata *smm, struct block_op *op)
|
|
{
|
|
int r = 0;
|
|
enum allocation_event ev;
|
|
|
|
switch (op->type) {
|
|
case BOP_INC:
|
|
r = sm_ll_inc(&smm->ll, op->block, &ev);
|
|
break;
|
|
|
|
case BOP_DEC:
|
|
r = sm_ll_dec(&smm->ll, op->block, &ev);
|
|
break;
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
static void in(struct sm_metadata *smm)
|
|
{
|
|
smm->recursion_count++;
|
|
}
|
|
|
|
static int apply_bops(struct sm_metadata *smm)
|
|
{
|
|
int r = 0;
|
|
|
|
while (!brb_empty(&smm->uncommitted)) {
|
|
struct block_op bop;
|
|
|
|
r = brb_pop(&smm->uncommitted, &bop);
|
|
if (r) {
|
|
DMERR("bug in bop ring buffer");
|
|
break;
|
|
}
|
|
|
|
r = commit_bop(smm, &bop);
|
|
if (r)
|
|
break;
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
static int out(struct sm_metadata *smm)
|
|
{
|
|
int r = 0;
|
|
|
|
/*
|
|
* If we're not recursing then very bad things are happening.
|
|
*/
|
|
if (!smm->recursion_count) {
|
|
DMERR("lost track of recursion depth");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (smm->recursion_count == 1)
|
|
apply_bops(smm);
|
|
|
|
smm->recursion_count--;
|
|
|
|
return r;
|
|
}
|
|
|
|
/*
|
|
* When using the out() function above, we often want to combine an error
|
|
* code for the operation run in the recursive context with that from
|
|
* out().
|
|
*/
|
|
static int combine_errors(int r1, int r2)
|
|
{
|
|
return r1 ? r1 : r2;
|
|
}
|
|
|
|
static int recursing(struct sm_metadata *smm)
|
|
{
|
|
return smm->recursion_count;
|
|
}
|
|
|
|
static void sm_metadata_destroy(struct dm_space_map *sm)
|
|
{
|
|
struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm);
|
|
|
|
kfree(smm);
|
|
}
|
|
|
|
static int sm_metadata_get_nr_blocks(struct dm_space_map *sm, dm_block_t *count)
|
|
{
|
|
struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm);
|
|
|
|
*count = smm->ll.nr_blocks;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sm_metadata_get_nr_free(struct dm_space_map *sm, dm_block_t *count)
|
|
{
|
|
struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm);
|
|
|
|
*count = smm->old_ll.nr_blocks - smm->old_ll.nr_allocated -
|
|
smm->allocated_this_transaction;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sm_metadata_get_count(struct dm_space_map *sm, dm_block_t b,
|
|
uint32_t *result)
|
|
{
|
|
int r;
|
|
unsigned i;
|
|
struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm);
|
|
unsigned adjustment = 0;
|
|
|
|
/*
|
|
* We may have some uncommitted adjustments to add. This list
|
|
* should always be really short.
|
|
*/
|
|
for (i = smm->uncommitted.begin;
|
|
i != smm->uncommitted.end;
|
|
i = brb_next(&smm->uncommitted, i)) {
|
|
struct block_op *op = smm->uncommitted.bops + i;
|
|
|
|
if (op->block != b)
|
|
continue;
|
|
|
|
switch (op->type) {
|
|
case BOP_INC:
|
|
adjustment++;
|
|
break;
|
|
|
|
case BOP_DEC:
|
|
adjustment--;
|
|
break;
|
|
}
|
|
}
|
|
|
|
r = sm_ll_lookup(&smm->ll, b, result);
|
|
if (r)
|
|
return r;
|
|
|
|
*result += adjustment;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sm_metadata_count_is_more_than_one(struct dm_space_map *sm,
|
|
dm_block_t b, int *result)
|
|
{
|
|
int r, adjustment = 0;
|
|
unsigned i;
|
|
struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm);
|
|
uint32_t rc;
|
|
|
|
/*
|
|
* We may have some uncommitted adjustments to add. This list
|
|
* should always be really short.
|
|
*/
|
|
for (i = smm->uncommitted.begin;
|
|
i != smm->uncommitted.end;
|
|
i = brb_next(&smm->uncommitted, i)) {
|
|
|
|
struct block_op *op = smm->uncommitted.bops + i;
|
|
|
|
if (op->block != b)
|
|
continue;
|
|
|
|
switch (op->type) {
|
|
case BOP_INC:
|
|
adjustment++;
|
|
break;
|
|
|
|
case BOP_DEC:
|
|
adjustment--;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (adjustment > 1) {
|
|
*result = 1;
|
|
return 0;
|
|
}
|
|
|
|
r = sm_ll_lookup_bitmap(&smm->ll, b, &rc);
|
|
if (r)
|
|
return r;
|
|
|
|
if (rc == 3)
|
|
/*
|
|
* We err on the side of caution, and always return true.
|
|
*/
|
|
*result = 1;
|
|
else
|
|
*result = rc + adjustment > 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sm_metadata_set_count(struct dm_space_map *sm, dm_block_t b,
|
|
uint32_t count)
|
|
{
|
|
int r, r2;
|
|
enum allocation_event ev;
|
|
struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm);
|
|
|
|
if (smm->recursion_count) {
|
|
DMERR("cannot recurse set_count()");
|
|
return -EINVAL;
|
|
}
|
|
|
|
in(smm);
|
|
r = sm_ll_insert(&smm->ll, b, count, &ev);
|
|
r2 = out(smm);
|
|
|
|
return combine_errors(r, r2);
|
|
}
|
|
|
|
static int sm_metadata_inc_block(struct dm_space_map *sm, dm_block_t b)
|
|
{
|
|
int r, r2 = 0;
|
|
enum allocation_event ev;
|
|
struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm);
|
|
|
|
if (recursing(smm))
|
|
r = add_bop(smm, BOP_INC, b);
|
|
else {
|
|
in(smm);
|
|
r = sm_ll_inc(&smm->ll, b, &ev);
|
|
r2 = out(smm);
|
|
}
|
|
|
|
return combine_errors(r, r2);
|
|
}
|
|
|
|
static int sm_metadata_dec_block(struct dm_space_map *sm, dm_block_t b)
|
|
{
|
|
int r, r2 = 0;
|
|
enum allocation_event ev;
|
|
struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm);
|
|
|
|
if (recursing(smm))
|
|
r = add_bop(smm, BOP_DEC, b);
|
|
else {
|
|
in(smm);
|
|
r = sm_ll_dec(&smm->ll, b, &ev);
|
|
r2 = out(smm);
|
|
}
|
|
|
|
return combine_errors(r, r2);
|
|
}
|
|
|
|
static int sm_metadata_new_block_(struct dm_space_map *sm, dm_block_t *b)
|
|
{
|
|
int r, r2 = 0;
|
|
enum allocation_event ev;
|
|
struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm);
|
|
|
|
r = sm_ll_find_free_block(&smm->old_ll, smm->begin, smm->old_ll.nr_blocks, b);
|
|
if (r)
|
|
return r;
|
|
|
|
smm->begin = *b + 1;
|
|
|
|
if (recursing(smm))
|
|
r = add_bop(smm, BOP_INC, *b);
|
|
else {
|
|
in(smm);
|
|
r = sm_ll_inc(&smm->ll, *b, &ev);
|
|
r2 = out(smm);
|
|
}
|
|
|
|
if (!r)
|
|
smm->allocated_this_transaction++;
|
|
|
|
return combine_errors(r, r2);
|
|
}
|
|
|
|
static int sm_metadata_new_block(struct dm_space_map *sm, dm_block_t *b)
|
|
{
|
|
dm_block_t count;
|
|
struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm);
|
|
|
|
int r = sm_metadata_new_block_(sm, b);
|
|
if (r) {
|
|
DMERR_LIMIT("unable to allocate new metadata block");
|
|
return r;
|
|
}
|
|
|
|
r = sm_metadata_get_nr_free(sm, &count);
|
|
if (r) {
|
|
DMERR_LIMIT("couldn't get free block count");
|
|
return r;
|
|
}
|
|
|
|
check_threshold(&smm->threshold, count);
|
|
|
|
return r;
|
|
}
|
|
|
|
static int sm_metadata_commit(struct dm_space_map *sm)
|
|
{
|
|
int r;
|
|
struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm);
|
|
|
|
r = sm_ll_commit(&smm->ll);
|
|
if (r)
|
|
return r;
|
|
|
|
memcpy(&smm->old_ll, &smm->ll, sizeof(smm->old_ll));
|
|
smm->begin = 0;
|
|
smm->allocated_this_transaction = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sm_metadata_register_threshold_callback(struct dm_space_map *sm,
|
|
dm_block_t threshold,
|
|
dm_sm_threshold_fn fn,
|
|
void *context)
|
|
{
|
|
struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm);
|
|
|
|
set_threshold(&smm->threshold, threshold, fn, context);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sm_metadata_root_size(struct dm_space_map *sm, size_t *result)
|
|
{
|
|
*result = sizeof(struct disk_sm_root);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sm_metadata_copy_root(struct dm_space_map *sm, void *where_le, size_t max)
|
|
{
|
|
struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm);
|
|
struct disk_sm_root root_le;
|
|
|
|
root_le.nr_blocks = cpu_to_le64(smm->ll.nr_blocks);
|
|
root_le.nr_allocated = cpu_to_le64(smm->ll.nr_allocated);
|
|
root_le.bitmap_root = cpu_to_le64(smm->ll.bitmap_root);
|
|
root_le.ref_count_root = cpu_to_le64(smm->ll.ref_count_root);
|
|
|
|
if (max < sizeof(root_le))
|
|
return -ENOSPC;
|
|
|
|
memcpy(where_le, &root_le, sizeof(root_le));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sm_metadata_extend(struct dm_space_map *sm, dm_block_t extra_blocks);
|
|
|
|
static struct dm_space_map ops = {
|
|
.destroy = sm_metadata_destroy,
|
|
.extend = sm_metadata_extend,
|
|
.get_nr_blocks = sm_metadata_get_nr_blocks,
|
|
.get_nr_free = sm_metadata_get_nr_free,
|
|
.get_count = sm_metadata_get_count,
|
|
.count_is_more_than_one = sm_metadata_count_is_more_than_one,
|
|
.set_count = sm_metadata_set_count,
|
|
.inc_block = sm_metadata_inc_block,
|
|
.dec_block = sm_metadata_dec_block,
|
|
.new_block = sm_metadata_new_block,
|
|
.commit = sm_metadata_commit,
|
|
.root_size = sm_metadata_root_size,
|
|
.copy_root = sm_metadata_copy_root,
|
|
.register_threshold_callback = sm_metadata_register_threshold_callback
|
|
};
|
|
|
|
/*----------------------------------------------------------------*/
|
|
|
|
/*
|
|
* When a new space map is created that manages its own space. We use
|
|
* this tiny bootstrap allocator.
|
|
*/
|
|
static void sm_bootstrap_destroy(struct dm_space_map *sm)
|
|
{
|
|
}
|
|
|
|
static int sm_bootstrap_extend(struct dm_space_map *sm, dm_block_t extra_blocks)
|
|
{
|
|
DMERR("bootstrap doesn't support extend");
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int sm_bootstrap_get_nr_blocks(struct dm_space_map *sm, dm_block_t *count)
|
|
{
|
|
struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm);
|
|
|
|
*count = smm->ll.nr_blocks;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sm_bootstrap_get_nr_free(struct dm_space_map *sm, dm_block_t *count)
|
|
{
|
|
struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm);
|
|
|
|
*count = smm->ll.nr_blocks - smm->begin;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sm_bootstrap_get_count(struct dm_space_map *sm, dm_block_t b,
|
|
uint32_t *result)
|
|
{
|
|
struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm);
|
|
|
|
*result = (b < smm->begin) ? 1 : 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sm_bootstrap_count_is_more_than_one(struct dm_space_map *sm,
|
|
dm_block_t b, int *result)
|
|
{
|
|
*result = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sm_bootstrap_set_count(struct dm_space_map *sm, dm_block_t b,
|
|
uint32_t count)
|
|
{
|
|
DMERR("bootstrap doesn't support set_count");
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int sm_bootstrap_new_block(struct dm_space_map *sm, dm_block_t *b)
|
|
{
|
|
struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm);
|
|
|
|
/*
|
|
* We know the entire device is unused.
|
|
*/
|
|
if (smm->begin == smm->ll.nr_blocks)
|
|
return -ENOSPC;
|
|
|
|
*b = smm->begin++;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sm_bootstrap_inc_block(struct dm_space_map *sm, dm_block_t b)
|
|
{
|
|
struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm);
|
|
|
|
return add_bop(smm, BOP_INC, b);
|
|
}
|
|
|
|
static int sm_bootstrap_dec_block(struct dm_space_map *sm, dm_block_t b)
|
|
{
|
|
struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm);
|
|
|
|
return add_bop(smm, BOP_DEC, b);
|
|
}
|
|
|
|
static int sm_bootstrap_commit(struct dm_space_map *sm)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int sm_bootstrap_root_size(struct dm_space_map *sm, size_t *result)
|
|
{
|
|
DMERR("bootstrap doesn't support root_size");
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int sm_bootstrap_copy_root(struct dm_space_map *sm, void *where,
|
|
size_t max)
|
|
{
|
|
DMERR("bootstrap doesn't support copy_root");
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
static struct dm_space_map bootstrap_ops = {
|
|
.destroy = sm_bootstrap_destroy,
|
|
.extend = sm_bootstrap_extend,
|
|
.get_nr_blocks = sm_bootstrap_get_nr_blocks,
|
|
.get_nr_free = sm_bootstrap_get_nr_free,
|
|
.get_count = sm_bootstrap_get_count,
|
|
.count_is_more_than_one = sm_bootstrap_count_is_more_than_one,
|
|
.set_count = sm_bootstrap_set_count,
|
|
.inc_block = sm_bootstrap_inc_block,
|
|
.dec_block = sm_bootstrap_dec_block,
|
|
.new_block = sm_bootstrap_new_block,
|
|
.commit = sm_bootstrap_commit,
|
|
.root_size = sm_bootstrap_root_size,
|
|
.copy_root = sm_bootstrap_copy_root,
|
|
.register_threshold_callback = NULL
|
|
};
|
|
|
|
/*----------------------------------------------------------------*/
|
|
|
|
static int sm_metadata_extend(struct dm_space_map *sm, dm_block_t extra_blocks)
|
|
{
|
|
int r, i;
|
|
enum allocation_event ev;
|
|
struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm);
|
|
dm_block_t old_len = smm->ll.nr_blocks;
|
|
|
|
/*
|
|
* Flick into a mode where all blocks get allocated in the new area.
|
|
*/
|
|
smm->begin = old_len;
|
|
memcpy(sm, &bootstrap_ops, sizeof(*sm));
|
|
|
|
/*
|
|
* Extend.
|
|
*/
|
|
r = sm_ll_extend(&smm->ll, extra_blocks);
|
|
if (r)
|
|
goto out;
|
|
|
|
/*
|
|
* We repeatedly increment then commit until the commit doesn't
|
|
* allocate any new blocks.
|
|
*/
|
|
do {
|
|
for (i = old_len; !r && i < smm->begin; i++) {
|
|
r = sm_ll_inc(&smm->ll, i, &ev);
|
|
if (r)
|
|
goto out;
|
|
}
|
|
old_len = smm->begin;
|
|
|
|
r = apply_bops(smm);
|
|
if (r) {
|
|
DMERR("%s: apply_bops failed", __func__);
|
|
goto out;
|
|
}
|
|
|
|
r = sm_ll_commit(&smm->ll);
|
|
if (r)
|
|
goto out;
|
|
|
|
} while (old_len != smm->begin);
|
|
|
|
out:
|
|
/*
|
|
* Switch back to normal behaviour.
|
|
*/
|
|
memcpy(sm, &ops, sizeof(*sm));
|
|
return r;
|
|
}
|
|
|
|
/*----------------------------------------------------------------*/
|
|
|
|
struct dm_space_map *dm_sm_metadata_init(void)
|
|
{
|
|
struct sm_metadata *smm;
|
|
|
|
smm = kmalloc(sizeof(*smm), GFP_KERNEL);
|
|
if (!smm)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
memcpy(&smm->sm, &ops, sizeof(smm->sm));
|
|
|
|
return &smm->sm;
|
|
}
|
|
|
|
int dm_sm_metadata_create(struct dm_space_map *sm,
|
|
struct dm_transaction_manager *tm,
|
|
dm_block_t nr_blocks,
|
|
dm_block_t superblock)
|
|
{
|
|
int r;
|
|
dm_block_t i;
|
|
enum allocation_event ev;
|
|
struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm);
|
|
|
|
smm->begin = superblock + 1;
|
|
smm->recursion_count = 0;
|
|
smm->allocated_this_transaction = 0;
|
|
brb_init(&smm->uncommitted);
|
|
threshold_init(&smm->threshold);
|
|
|
|
memcpy(&smm->sm, &bootstrap_ops, sizeof(smm->sm));
|
|
|
|
r = sm_ll_new_metadata(&smm->ll, tm);
|
|
if (r)
|
|
return r;
|
|
|
|
if (nr_blocks > DM_SM_METADATA_MAX_BLOCKS)
|
|
nr_blocks = DM_SM_METADATA_MAX_BLOCKS;
|
|
r = sm_ll_extend(&smm->ll, nr_blocks);
|
|
if (r)
|
|
return r;
|
|
|
|
memcpy(&smm->sm, &ops, sizeof(smm->sm));
|
|
|
|
/*
|
|
* Now we need to update the newly created data structures with the
|
|
* allocated blocks that they were built from.
|
|
*/
|
|
for (i = superblock; !r && i < smm->begin; i++)
|
|
r = sm_ll_inc(&smm->ll, i, &ev);
|
|
|
|
if (r)
|
|
return r;
|
|
|
|
r = apply_bops(smm);
|
|
if (r) {
|
|
DMERR("%s: apply_bops failed", __func__);
|
|
return r;
|
|
}
|
|
|
|
return sm_metadata_commit(sm);
|
|
}
|
|
|
|
int dm_sm_metadata_open(struct dm_space_map *sm,
|
|
struct dm_transaction_manager *tm,
|
|
void *root_le, size_t len)
|
|
{
|
|
int r;
|
|
struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm);
|
|
|
|
r = sm_ll_open_metadata(&smm->ll, tm, root_le, len);
|
|
if (r)
|
|
return r;
|
|
|
|
smm->begin = 0;
|
|
smm->recursion_count = 0;
|
|
smm->allocated_this_transaction = 0;
|
|
brb_init(&smm->uncommitted);
|
|
threshold_init(&smm->threshold);
|
|
|
|
memcpy(&smm->old_ll, &smm->ll, sizeof(smm->old_ll));
|
|
return 0;
|
|
}
|