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be500ed721
When we break sharing on btree nodes we typically need to increment the reference counts to every value held in the node. This can cause a lot of repeated calls to the space maps. Fix this by changing the interface to the space map inc/dec methods to take ranges of adjacent blocks to be operated on. For installations that are using a lot of snapshots this will reduce cpu overhead of fundamental operations such as provisioning a new block, or deleting a snapshot, by as much as 10 times. Signed-off-by: Joe Thornber <ejt@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
843 lines
18 KiB
C
843 lines
18 KiB
C
/*
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* Copyright (C) 2011 Red Hat, Inc.
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*
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* This file is released under the GPL.
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*/
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#include "dm-space-map.h"
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#include "dm-space-map-common.h"
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#include "dm-space-map-metadata.h"
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#include <linux/list.h>
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#include <linux/slab.h>
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#include <linux/device-mapper.h>
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#include <linux/kernel.h>
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#define DM_MSG_PREFIX "space map metadata"
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/*----------------------------------------------------------------*/
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/*
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* An edge triggered threshold.
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*/
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struct threshold {
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bool threshold_set;
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bool value_set;
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dm_block_t threshold;
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dm_block_t current_value;
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dm_sm_threshold_fn fn;
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void *context;
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};
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static void threshold_init(struct threshold *t)
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{
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t->threshold_set = false;
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t->value_set = false;
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}
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static void set_threshold(struct threshold *t, dm_block_t value,
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dm_sm_threshold_fn fn, void *context)
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{
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t->threshold_set = true;
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t->threshold = value;
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t->fn = fn;
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t->context = context;
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}
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static bool below_threshold(struct threshold *t, dm_block_t value)
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{
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return t->threshold_set && value <= t->threshold;
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}
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static bool threshold_already_triggered(struct threshold *t)
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{
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return t->value_set && below_threshold(t, t->current_value);
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}
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static void check_threshold(struct threshold *t, dm_block_t value)
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{
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if (below_threshold(t, value) &&
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!threshold_already_triggered(t))
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t->fn(t->context);
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t->value_set = true;
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t->current_value = value;
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}
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/*----------------------------------------------------------------*/
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/*
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* Space map interface.
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*
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* The low level disk format is written using the standard btree and
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* transaction manager. This means that performing disk operations may
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* cause us to recurse into the space map in order to allocate new blocks.
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* For this reason we have a pool of pre-allocated blocks large enough to
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* service any metadata_ll_disk operation.
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*/
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/*
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* FIXME: we should calculate this based on the size of the device.
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* Only the metadata space map needs this functionality.
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*/
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#define MAX_RECURSIVE_ALLOCATIONS 1024
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enum block_op_type {
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BOP_INC,
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BOP_DEC
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};
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struct block_op {
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enum block_op_type type;
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dm_block_t b;
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dm_block_t e;
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};
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struct bop_ring_buffer {
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unsigned begin;
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unsigned end;
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struct block_op bops[MAX_RECURSIVE_ALLOCATIONS + 1];
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};
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static void brb_init(struct bop_ring_buffer *brb)
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{
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brb->begin = 0;
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brb->end = 0;
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}
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static bool brb_empty(struct bop_ring_buffer *brb)
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{
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return brb->begin == brb->end;
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}
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static unsigned brb_next(struct bop_ring_buffer *brb, unsigned old)
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{
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unsigned r = old + 1;
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return r >= ARRAY_SIZE(brb->bops) ? 0 : r;
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}
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static int brb_push(struct bop_ring_buffer *brb,
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enum block_op_type type, dm_block_t b, dm_block_t e)
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{
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struct block_op *bop;
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unsigned next = brb_next(brb, brb->end);
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/*
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* We don't allow the last bop to be filled, this way we can
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* differentiate between full and empty.
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*/
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if (next == brb->begin)
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return -ENOMEM;
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bop = brb->bops + brb->end;
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bop->type = type;
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bop->b = b;
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bop->e = e;
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brb->end = next;
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return 0;
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}
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static int brb_peek(struct bop_ring_buffer *brb, struct block_op *result)
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{
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struct block_op *bop;
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if (brb_empty(brb))
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return -ENODATA;
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bop = brb->bops + brb->begin;
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memcpy(result, bop, sizeof(*result));
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return 0;
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}
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static int brb_pop(struct bop_ring_buffer *brb)
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{
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if (brb_empty(brb))
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return -ENODATA;
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brb->begin = brb_next(brb, brb->begin);
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return 0;
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}
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/*----------------------------------------------------------------*/
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struct sm_metadata {
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struct dm_space_map sm;
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struct ll_disk ll;
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struct ll_disk old_ll;
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dm_block_t begin;
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unsigned recursion_count;
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unsigned allocated_this_transaction;
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struct bop_ring_buffer uncommitted;
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struct threshold threshold;
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};
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static int add_bop(struct sm_metadata *smm, enum block_op_type type, dm_block_t b, dm_block_t e)
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{
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int r = brb_push(&smm->uncommitted, type, b, e);
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if (r) {
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DMERR("too many recursive allocations");
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return -ENOMEM;
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}
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return 0;
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}
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static int commit_bop(struct sm_metadata *smm, struct block_op *op)
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{
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int r = 0;
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int32_t nr_allocations;
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switch (op->type) {
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case BOP_INC:
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r = sm_ll_inc(&smm->ll, op->b, op->e, &nr_allocations);
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break;
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case BOP_DEC:
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r = sm_ll_dec(&smm->ll, op->b, op->e, &nr_allocations);
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break;
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}
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return r;
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}
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static void in(struct sm_metadata *smm)
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{
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smm->recursion_count++;
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}
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static int apply_bops(struct sm_metadata *smm)
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{
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int r = 0;
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while (!brb_empty(&smm->uncommitted)) {
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struct block_op bop;
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r = brb_peek(&smm->uncommitted, &bop);
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if (r) {
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DMERR("bug in bop ring buffer");
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break;
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}
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r = commit_bop(smm, &bop);
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if (r)
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break;
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brb_pop(&smm->uncommitted);
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}
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return r;
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}
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static int out(struct sm_metadata *smm)
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{
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int r = 0;
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/*
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* If we're not recursing then very bad things are happening.
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*/
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if (!smm->recursion_count) {
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DMERR("lost track of recursion depth");
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return -ENOMEM;
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}
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if (smm->recursion_count == 1)
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r = apply_bops(smm);
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smm->recursion_count--;
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return r;
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}
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/*
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* When using the out() function above, we often want to combine an error
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* code for the operation run in the recursive context with that from
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* out().
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*/
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static int combine_errors(int r1, int r2)
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{
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return r1 ? r1 : r2;
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}
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static int recursing(struct sm_metadata *smm)
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{
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return smm->recursion_count;
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}
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static void sm_metadata_destroy(struct dm_space_map *sm)
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{
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struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm);
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kfree(smm);
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}
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static int sm_metadata_get_nr_blocks(struct dm_space_map *sm, dm_block_t *count)
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{
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struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm);
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*count = smm->ll.nr_blocks;
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return 0;
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}
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static int sm_metadata_get_nr_free(struct dm_space_map *sm, dm_block_t *count)
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{
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struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm);
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*count = smm->old_ll.nr_blocks - smm->old_ll.nr_allocated -
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smm->allocated_this_transaction;
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return 0;
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}
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static int sm_metadata_get_count(struct dm_space_map *sm, dm_block_t b,
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uint32_t *result)
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{
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int r;
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unsigned i;
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struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm);
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unsigned adjustment = 0;
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/*
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* We may have some uncommitted adjustments to add. This list
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* should always be really short.
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*/
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for (i = smm->uncommitted.begin;
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i != smm->uncommitted.end;
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i = brb_next(&smm->uncommitted, i)) {
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struct block_op *op = smm->uncommitted.bops + i;
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if (b < op->b || b >= op->e)
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continue;
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switch (op->type) {
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case BOP_INC:
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adjustment++;
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break;
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case BOP_DEC:
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adjustment--;
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break;
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}
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}
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r = sm_ll_lookup(&smm->ll, b, result);
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if (r)
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return r;
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*result += adjustment;
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return 0;
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}
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static int sm_metadata_count_is_more_than_one(struct dm_space_map *sm,
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dm_block_t b, int *result)
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{
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int r, adjustment = 0;
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unsigned i;
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struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm);
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uint32_t rc;
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/*
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* We may have some uncommitted adjustments to add. This list
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* should always be really short.
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*/
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for (i = smm->uncommitted.begin;
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i != smm->uncommitted.end;
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i = brb_next(&smm->uncommitted, i)) {
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struct block_op *op = smm->uncommitted.bops + i;
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if (b < op->b || b >= op->e)
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continue;
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switch (op->type) {
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case BOP_INC:
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adjustment++;
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break;
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case BOP_DEC:
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adjustment--;
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break;
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}
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}
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if (adjustment > 1) {
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*result = 1;
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return 0;
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}
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r = sm_ll_lookup_bitmap(&smm->ll, b, &rc);
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if (r)
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return r;
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if (rc == 3)
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/*
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* We err on the side of caution, and always return true.
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*/
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*result = 1;
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else
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*result = rc + adjustment > 1;
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return 0;
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}
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static int sm_metadata_set_count(struct dm_space_map *sm, dm_block_t b,
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uint32_t count)
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{
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int r, r2;
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int32_t nr_allocations;
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struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm);
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if (smm->recursion_count) {
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DMERR("cannot recurse set_count()");
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return -EINVAL;
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}
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in(smm);
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r = sm_ll_insert(&smm->ll, b, count, &nr_allocations);
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r2 = out(smm);
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return combine_errors(r, r2);
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}
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static int sm_metadata_inc_blocks(struct dm_space_map *sm, dm_block_t b, dm_block_t e)
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{
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int r, r2 = 0;
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int32_t nr_allocations;
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struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm);
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if (recursing(smm)) {
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r = add_bop(smm, BOP_INC, b, e);
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if (r)
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return r;
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} else {
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in(smm);
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r = sm_ll_inc(&smm->ll, b, e, &nr_allocations);
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r2 = out(smm);
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}
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return combine_errors(r, r2);
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}
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static int sm_metadata_dec_blocks(struct dm_space_map *sm, dm_block_t b, dm_block_t e)
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{
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int r, r2 = 0;
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int32_t nr_allocations;
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struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm);
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if (recursing(smm))
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r = add_bop(smm, BOP_DEC, b, e);
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else {
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in(smm);
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r = sm_ll_dec(&smm->ll, b, e, &nr_allocations);
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r2 = out(smm);
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}
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return combine_errors(r, r2);
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}
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static int sm_metadata_new_block_(struct dm_space_map *sm, dm_block_t *b)
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{
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int r, r2 = 0;
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int32_t nr_allocations;
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struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm);
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/*
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* Any block we allocate has to be free in both the old and current ll.
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*/
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r = sm_ll_find_common_free_block(&smm->old_ll, &smm->ll, smm->begin, smm->ll.nr_blocks, b);
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if (r == -ENOSPC) {
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/*
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* There's no free block between smm->begin and the end of the metadata device.
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* We search before smm->begin in case something has been freed.
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*/
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r = sm_ll_find_common_free_block(&smm->old_ll, &smm->ll, 0, smm->begin, b);
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}
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if (r)
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return r;
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smm->begin = *b + 1;
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if (recursing(smm))
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r = add_bop(smm, BOP_INC, *b, *b + 1);
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else {
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in(smm);
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r = sm_ll_inc(&smm->ll, *b, *b + 1, &nr_allocations);
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r2 = out(smm);
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}
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if (!r)
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smm->allocated_this_transaction++;
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return combine_errors(r, r2);
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}
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static int sm_metadata_new_block(struct dm_space_map *sm, dm_block_t *b)
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{
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dm_block_t count;
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struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm);
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int r = sm_metadata_new_block_(sm, b);
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if (r) {
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DMERR_LIMIT("unable to allocate new metadata block");
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return r;
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}
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r = sm_metadata_get_nr_free(sm, &count);
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if (r) {
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DMERR_LIMIT("couldn't get free block count");
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return r;
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}
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check_threshold(&smm->threshold, count);
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return r;
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}
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static int sm_metadata_commit(struct dm_space_map *sm)
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{
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int r;
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struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm);
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r = sm_ll_commit(&smm->ll);
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if (r)
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return r;
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memcpy(&smm->old_ll, &smm->ll, sizeof(smm->old_ll));
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smm->allocated_this_transaction = 0;
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return 0;
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}
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static int sm_metadata_register_threshold_callback(struct dm_space_map *sm,
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dm_block_t threshold,
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dm_sm_threshold_fn fn,
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void *context)
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{
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struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm);
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set_threshold(&smm->threshold, threshold, fn, context);
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return 0;
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}
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static int sm_metadata_root_size(struct dm_space_map *sm, size_t *result)
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{
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*result = sizeof(struct disk_sm_root);
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return 0;
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}
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static int sm_metadata_copy_root(struct dm_space_map *sm, void *where_le, size_t max)
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{
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struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm);
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struct disk_sm_root root_le;
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root_le.nr_blocks = cpu_to_le64(smm->ll.nr_blocks);
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root_le.nr_allocated = cpu_to_le64(smm->ll.nr_allocated);
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root_le.bitmap_root = cpu_to_le64(smm->ll.bitmap_root);
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root_le.ref_count_root = cpu_to_le64(smm->ll.ref_count_root);
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if (max < sizeof(root_le))
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return -ENOSPC;
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memcpy(where_le, &root_le, sizeof(root_le));
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return 0;
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}
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static int sm_metadata_extend(struct dm_space_map *sm, dm_block_t extra_blocks);
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static const struct dm_space_map ops = {
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.destroy = sm_metadata_destroy,
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.extend = sm_metadata_extend,
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.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_blocks = sm_metadata_inc_blocks,
|
|
.dec_blocks = sm_metadata_dec_blocks,
|
|
.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_blocks(struct dm_space_map *sm, dm_block_t b, dm_block_t e)
|
|
{
|
|
int r;
|
|
struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm);
|
|
|
|
r = add_bop(smm, BOP_INC, b, e);
|
|
if (r)
|
|
return r;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sm_bootstrap_dec_blocks(struct dm_space_map *sm, dm_block_t b, dm_block_t e)
|
|
{
|
|
int r;
|
|
struct sm_metadata *smm = container_of(sm, struct sm_metadata, sm);
|
|
|
|
r = add_bop(smm, BOP_DEC, b, e);
|
|
if (r)
|
|
return r;
|
|
|
|
return 0;
|
|
}
|
|
|
|
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 const 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_blocks = sm_bootstrap_inc_blocks,
|
|
.dec_blocks = sm_bootstrap_dec_blocks,
|
|
.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;
|
|
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 {
|
|
r = add_bop(smm, BOP_INC, old_len, smm->begin);
|
|
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;
|
|
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) {
|
|
if (nr_blocks > DM_SM_METADATA_MAX_BLOCKS)
|
|
nr_blocks = DM_SM_METADATA_MAX_BLOCKS;
|
|
r = sm_ll_extend(&smm->ll, nr_blocks);
|
|
}
|
|
memcpy(&smm->sm, &ops, sizeof(smm->sm));
|
|
if (r)
|
|
return r;
|
|
|
|
/*
|
|
* Now we need to update the newly created data structures with the
|
|
* allocated blocks that they were built from.
|
|
*/
|
|
r = add_bop(smm, BOP_INC, superblock, smm->begin);
|
|
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;
|
|
}
|