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/*
* CDDL HEADER START
*
* This file and its contents are supplied under the terms of the
* Common Development and Distribution License ("CDDL"), version 1.0.
* You may only use this file in accordance with the terms of version
* 1.0 of the CDDL.
*
* A full copy of the text of the CDDL should have accompanied this
* source. A copy of the CDDL is also available via the Internet at
* http://www.illumos.org/license/CDDL.
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2015 by Delphix. All rights reserved.
*/
#include <sys/dmu_tx.h>
#include <sys/spa.h>
#include <sys/dmu.h>
#include <sys/dsl_pool.h>
#include <sys/vdev_indirect_births.h>
#ifdef ZFS_DEBUG
static boolean_t
vdev_indirect_births_verify(vdev_indirect_births_t *vib)
{
ASSERT(vib != NULL);
ASSERT(vib->vib_object != 0);
ASSERT(vib->vib_objset != NULL);
ASSERT(vib->vib_phys != NULL);
ASSERT(vib->vib_dbuf != NULL);
EQUIV(vib->vib_phys->vib_count > 0, vib->vib_entries != NULL);
return (B_TRUE);
}
#endif
uint64_t
vdev_indirect_births_count(vdev_indirect_births_t *vib)
{
ASSERT(vdev_indirect_births_verify(vib));
return (vib->vib_phys->vib_count);
}
uint64_t
vdev_indirect_births_object(vdev_indirect_births_t *vib)
{
ASSERT(vdev_indirect_births_verify(vib));
return (vib->vib_object);
}
static uint64_t
vdev_indirect_births_size_impl(vdev_indirect_births_t *vib)
{
return (vib->vib_phys->vib_count * sizeof (*vib->vib_entries));
}
void
vdev_indirect_births_close(vdev_indirect_births_t *vib)
{
ASSERT(vdev_indirect_births_verify(vib));
if (vib->vib_phys->vib_count > 0) {
uint64_t births_size = vdev_indirect_births_size_impl(vib);
vmem_free(vib->vib_entries, births_size);
vib->vib_entries = NULL;
}
dmu_buf_rele(vib->vib_dbuf, vib);
vib->vib_objset = NULL;
vib->vib_object = 0;
vib->vib_dbuf = NULL;
vib->vib_phys = NULL;
kmem_free(vib, sizeof (*vib));
}
uint64_t
vdev_indirect_births_alloc(objset_t *os, dmu_tx_t *tx)
{
ASSERT(dmu_tx_is_syncing(tx));
return (dmu_object_alloc(os,
DMU_OTN_UINT64_METADATA, SPA_OLD_MAXBLOCKSIZE,
DMU_OTN_UINT64_METADATA, sizeof (vdev_indirect_birth_phys_t),
tx));
}
vdev_indirect_births_t *
vdev_indirect_births_open(objset_t *os, uint64_t births_object)
{
vdev_indirect_births_t *vib = kmem_zalloc(sizeof (*vib), KM_SLEEP);
vib->vib_objset = os;
vib->vib_object = births_object;
VERIFY0(dmu_bonus_hold(os, vib->vib_object, vib, &vib->vib_dbuf));
vib->vib_phys = vib->vib_dbuf->db_data;
if (vib->vib_phys->vib_count > 0) {
uint64_t births_size = vdev_indirect_births_size_impl(vib);
vib->vib_entries = vmem_alloc(births_size, KM_SLEEP);
VERIFY0(dmu_read(vib->vib_objset, vib->vib_object, 0,
births_size, vib->vib_entries, DMU_READ_PREFETCH));
}
ASSERT(vdev_indirect_births_verify(vib));
return (vib);
}
void
vdev_indirect_births_free(objset_t *os, uint64_t object, dmu_tx_t *tx)
{
VERIFY0(dmu_object_free(os, object, tx));
}
void
vdev_indirect_births_add_entry(vdev_indirect_births_t *vib,
uint64_t max_offset, uint64_t txg, dmu_tx_t *tx)
{
vdev_indirect_birth_entry_phys_t vibe;
uint64_t old_size;
uint64_t new_size;
vdev_indirect_birth_entry_phys_t *new_entries;
ASSERT(dmu_tx_is_syncing(tx));
ASSERT(dsl_pool_sync_context(dmu_tx_pool(tx)));
ASSERT(vdev_indirect_births_verify(vib));
dmu_buf_will_dirty(vib->vib_dbuf, tx);
vibe.vibe_offset = max_offset;
vibe.vibe_phys_birth_txg = txg;
old_size = vdev_indirect_births_size_impl(vib);
dmu_write(vib->vib_objset, vib->vib_object, old_size, sizeof (vibe),
&vibe, tx);
vib->vib_phys->vib_count++;
new_size = vdev_indirect_births_size_impl(vib);
new_entries = vmem_alloc(new_size, KM_SLEEP);
if (old_size > 0) {
bcopy(vib->vib_entries, new_entries, old_size);
vmem_free(vib->vib_entries, old_size);
}
new_entries[vib->vib_phys->vib_count - 1] = vibe;
vib->vib_entries = new_entries;
}
uint64_t
vdev_indirect_births_last_entry_txg(vdev_indirect_births_t *vib)
{
ASSERT(vdev_indirect_births_verify(vib));
ASSERT(vib->vib_phys->vib_count > 0);
vdev_indirect_birth_entry_phys_t *last =
&vib->vib_entries[vib->vib_phys->vib_count - 1];
return (last->vibe_phys_birth_txg);
}
/*
* Return the txg in which the given range was copied (i.e. its physical
* birth txg). The specified offset+asize must be contiguously mapped
* (i.e. not a split block).
*
* The entries are sorted by increasing phys_birth, and also by increasing
* offset. We find the specified offset by binary search. Note that we
* can not use bsearch() because looking at each entry independently is
* insufficient to find the correct entry. Each entry implicitly relies
* on the previous entry: an entry indicates that the offsets from the
* end of the previous entry to the end of this entry were written in the
* specified txg.
*/
uint64_t
vdev_indirect_births_physbirth(vdev_indirect_births_t *vib, uint64_t offset,
uint64_t asize)
{
vdev_indirect_birth_entry_phys_t *base;
vdev_indirect_birth_entry_phys_t *last;
ASSERT(vdev_indirect_births_verify(vib));
ASSERT(vib->vib_phys->vib_count > 0);
base = vib->vib_entries;
last = base + vib->vib_phys->vib_count - 1;
ASSERT3U(offset, <, last->vibe_offset);
while (last >= base) {
vdev_indirect_birth_entry_phys_t *p =
base + ((last - base) / 2);
if (offset >= p->vibe_offset) {
base = p + 1;
} else if (p == vib->vib_entries ||
offset >= (p - 1)->vibe_offset) {
ASSERT3U(offset + asize, <=, p->vibe_offset);
return (p->vibe_phys_birth_txg);
} else {
last = p - 1;
}
}
ASSERT(!"offset not found");
return (-1);
}
#if defined(_KERNEL)
EXPORT_SYMBOL(vdev_indirect_births_add_entry);
EXPORT_SYMBOL(vdev_indirect_births_alloc);
EXPORT_SYMBOL(vdev_indirect_births_close);
EXPORT_SYMBOL(vdev_indirect_births_count);
EXPORT_SYMBOL(vdev_indirect_births_free);
EXPORT_SYMBOL(vdev_indirect_births_last_entry_txg);
EXPORT_SYMBOL(vdev_indirect_births_object);
EXPORT_SYMBOL(vdev_indirect_births_open);
EXPORT_SYMBOL(vdev_indirect_births_physbirth);
#endif
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