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reactos/drivers/filesystems/btrfs/balance.c
Pierre Schweitzer 62e630de4c
[BTRFS] Upgrade to 1.5 
CORE-16494
2019-11-12 19:35:43 +01:00

3907 lines
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/* Copyright (c) Mark Harmstone 2016-17
*
* This file is part of WinBtrfs.
*
* WinBtrfs is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public Licence as published by
* the Free Software Foundation, either version 3 of the Licence, or
* (at your option) any later version.
*
* WinBtrfs is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public Licence for more details.
*
* You should have received a copy of the GNU Lesser General Public Licence
* along with WinBtrfs. If not, see <http://www.gnu.org/licenses/>. */
#include "btrfs_drv.h"
#include "btrfsioctl.h"
#include <ntddstor.h>
typedef struct {
uint64_t address;
uint64_t new_address;
tree_header* data;
EXTENT_ITEM* ei;
tree* t;
bool system;
LIST_ENTRY refs;
LIST_ENTRY list_entry;
} metadata_reloc;
typedef struct {
uint8_t type;
uint64_t hash;
union {
TREE_BLOCK_REF tbr;
SHARED_BLOCK_REF sbr;
};
metadata_reloc* parent;
bool top;
LIST_ENTRY list_entry;
} metadata_reloc_ref;
typedef struct {
uint64_t address;
uint64_t size;
uint64_t new_address;
chunk* newchunk;
EXTENT_ITEM* ei;
LIST_ENTRY refs;
LIST_ENTRY list_entry;
} data_reloc;
typedef struct {
uint8_t type;
uint64_t hash;
union {
EXTENT_DATA_REF edr;
SHARED_DATA_REF sdr;
};
metadata_reloc* parent;
LIST_ENTRY list_entry;
} data_reloc_ref;
#ifndef _MSC_VER // not in mingw yet
#define DEVICE_DSM_FLAG_TRIM_NOT_FS_ALLOCATED 0x80000000
#endif
#define BALANCE_UNIT 0x100000 // only read 1 MB at a time
static NTSTATUS add_metadata_reloc(_Requires_exclusive_lock_held_(_Curr_->tree_lock) device_extension* Vcb, LIST_ENTRY* items, traverse_ptr* tp,
bool skinny, metadata_reloc** mr2, chunk* c, LIST_ENTRY* rollback) {
NTSTATUS Status;
metadata_reloc* mr;
EXTENT_ITEM* ei;
uint16_t len;
uint64_t inline_rc;
uint8_t* ptr;
mr = ExAllocatePoolWithTag(PagedPool, sizeof(metadata_reloc), ALLOC_TAG);
if (!mr) {
ERR("out of memory\n");
return STATUS_INSUFFICIENT_RESOURCES;
}
mr->address = tp->item->key.obj_id;
mr->data = NULL;
mr->ei = (EXTENT_ITEM*)tp->item->data;
mr->system = false;
InitializeListHead(&mr->refs);
Status = delete_tree_item(Vcb, tp);
if (!NT_SUCCESS(Status)) {
ERR("delete_tree_item returned %08x\n", Status);
ExFreePool(mr);
return Status;
}
if (!c)
c = get_chunk_from_address(Vcb, tp->item->key.obj_id);
if (c) {
acquire_chunk_lock(c, Vcb);
c->used -= Vcb->superblock.node_size;
space_list_add(c, tp->item->key.obj_id, Vcb->superblock.node_size, rollback);
release_chunk_lock(c, Vcb);
}
ei = (EXTENT_ITEM*)tp->item->data;
inline_rc = 0;
len = tp->item->size - sizeof(EXTENT_ITEM);
ptr = (uint8_t*)tp->item->data + sizeof(EXTENT_ITEM);
if (!skinny) {
len -= sizeof(EXTENT_ITEM2);
ptr += sizeof(EXTENT_ITEM2);
}
while (len > 0) {
uint8_t secttype = *ptr;
uint16_t sectlen = secttype == TYPE_TREE_BLOCK_REF ? sizeof(TREE_BLOCK_REF) : (secttype == TYPE_SHARED_BLOCK_REF ? sizeof(SHARED_BLOCK_REF) : 0);
metadata_reloc_ref* ref;
len--;
if (sectlen > len) {
ERR("(%I64x,%x,%I64x): %x bytes left, expecting at least %x\n", tp->item->key.obj_id, tp->item->key.obj_type, tp->item->key.offset, len, sectlen);
return STATUS_INTERNAL_ERROR;
}
if (sectlen == 0) {
ERR("(%I64x,%x,%I64x): unrecognized extent type %x\n", tp->item->key.obj_id, tp->item->key.obj_type, tp->item->key.offset, secttype);
return STATUS_INTERNAL_ERROR;
}
ref = ExAllocatePoolWithTag(PagedPool, sizeof(metadata_reloc_ref), ALLOC_TAG);
if (!ref) {
ERR("out of memory\n");
return STATUS_INSUFFICIENT_RESOURCES;
}
if (secttype == TYPE_TREE_BLOCK_REF) {
ref->type = TYPE_TREE_BLOCK_REF;
RtlCopyMemory(&ref->tbr, ptr + sizeof(uint8_t), sizeof(TREE_BLOCK_REF));
inline_rc++;
} else if (secttype == TYPE_SHARED_BLOCK_REF) {
ref->type = TYPE_SHARED_BLOCK_REF;
RtlCopyMemory(&ref->sbr, ptr + sizeof(uint8_t), sizeof(SHARED_BLOCK_REF));
inline_rc++;
} else {
ERR("unexpected tree type %x\n", secttype);
ExFreePool(ref);
return STATUS_INTERNAL_ERROR;
}
ref->parent = NULL;
ref->top = false;
InsertTailList(&mr->refs, &ref->list_entry);
len -= sectlen;
ptr += sizeof(uint8_t) + sectlen;
}
if (inline_rc < ei->refcount) { // look for non-inline entries
traverse_ptr tp2 = *tp, next_tp;
while (find_next_item(Vcb, &tp2, &next_tp, false, NULL)) {
tp2 = next_tp;
if (tp2.item->key.obj_id == tp->item->key.obj_id) {
if (tp2.item->key.obj_type == TYPE_TREE_BLOCK_REF) {
metadata_reloc_ref* ref = ExAllocatePoolWithTag(PagedPool, sizeof(metadata_reloc_ref), ALLOC_TAG);
if (!ref) {
ERR("out of memory\n");
return STATUS_INSUFFICIENT_RESOURCES;
}
ref->type = TYPE_TREE_BLOCK_REF;
ref->tbr.offset = tp2.item->key.offset;
ref->parent = NULL;
ref->top = false;
InsertTailList(&mr->refs, &ref->list_entry);
Status = delete_tree_item(Vcb, &tp2);
if (!NT_SUCCESS(Status)) {
ERR("delete_tree_item returned %08x\n", Status);
return Status;
}
} else if (tp2.item->key.obj_type == TYPE_SHARED_BLOCK_REF) {
metadata_reloc_ref* ref = ExAllocatePoolWithTag(PagedPool, sizeof(metadata_reloc_ref), ALLOC_TAG);
if (!ref) {
ERR("out of memory\n");
return STATUS_INSUFFICIENT_RESOURCES;
}
ref->type = TYPE_SHARED_BLOCK_REF;
ref->sbr.offset = tp2.item->key.offset;
ref->parent = NULL;
ref->top = false;
InsertTailList(&mr->refs, &ref->list_entry);
Status = delete_tree_item(Vcb, &tp2);
if (!NT_SUCCESS(Status)) {
ERR("delete_tree_item returned %08x\n", Status);
return Status;
}
}
} else
break;
}
}
InsertTailList(items, &mr->list_entry);
if (mr2)
*mr2 = mr;
return STATUS_SUCCESS;
}
static NTSTATUS add_metadata_reloc_parent(_Requires_exclusive_lock_held_(_Curr_->tree_lock) device_extension* Vcb, LIST_ENTRY* items,
uint64_t address, metadata_reloc** mr2, LIST_ENTRY* rollback) {
LIST_ENTRY* le;
KEY searchkey;
traverse_ptr tp;
bool skinny = false;
NTSTATUS Status;
le = items->Flink;
while (le != items) {
metadata_reloc* mr = CONTAINING_RECORD(le, metadata_reloc, list_entry);
if (mr->address == address) {
*mr2 = mr;
return STATUS_SUCCESS;
}
le = le->Flink;
}
searchkey.obj_id = address;
searchkey.obj_type = TYPE_METADATA_ITEM;
searchkey.offset = 0xffffffffffffffff;
Status = find_item(Vcb, Vcb->extent_root, &tp, &searchkey, false, NULL);
if (!NT_SUCCESS(Status)) {
ERR("find_item returned %08x\n", Status);
return Status;
}
if (tp.item->key.obj_id == address && tp.item->key.obj_type == TYPE_METADATA_ITEM && tp.item->size >= sizeof(EXTENT_ITEM))
skinny = true;
else if (tp.item->key.obj_id == address && tp.item->key.obj_type == TYPE_EXTENT_ITEM && tp.item->key.offset == Vcb->superblock.node_size &&
tp.item->size >= sizeof(EXTENT_ITEM)) {
EXTENT_ITEM* ei = (EXTENT_ITEM*)tp.item->data;
if (!(ei->flags & EXTENT_ITEM_TREE_BLOCK)) {
ERR("EXTENT_ITEM for %I64x found, but tree flag not set\n", address);
return STATUS_INTERNAL_ERROR;
}
} else {
ERR("could not find valid EXTENT_ITEM for address %I64x\n", address);
return STATUS_INTERNAL_ERROR;
}
Status = add_metadata_reloc(Vcb, items, &tp, skinny, mr2, NULL, rollback);
if (!NT_SUCCESS(Status)) {
ERR("add_metadata_reloc returned %08x\n", Status);
return Status;
}
return STATUS_SUCCESS;
}
static void sort_metadata_reloc_refs(metadata_reloc* mr) {
LIST_ENTRY newlist, *le;
if (mr->refs.Flink == mr->refs.Blink) // 0 or 1 items
return;
// insertion sort
InitializeListHead(&newlist);
while (!IsListEmpty(&mr->refs)) {
metadata_reloc_ref* ref = CONTAINING_RECORD(RemoveHeadList(&mr->refs), metadata_reloc_ref, list_entry);
bool inserted = false;
if (ref->type == TYPE_TREE_BLOCK_REF)
ref->hash = ref->tbr.offset;
else if (ref->type == TYPE_SHARED_BLOCK_REF)
ref->hash = ref->parent->new_address;
le = newlist.Flink;
while (le != &newlist) {
metadata_reloc_ref* ref2 = CONTAINING_RECORD(le, metadata_reloc_ref, list_entry);
if (ref->type < ref2->type || (ref->type == ref2->type && ref->hash > ref2->hash)) {
InsertHeadList(le->Blink, &ref->list_entry);
inserted = true;
break;
}
le = le->Flink;
}
if (!inserted)
InsertTailList(&newlist, &ref->list_entry);
}
newlist.Flink->Blink = &mr->refs;
newlist.Blink->Flink = &mr->refs;
mr->refs.Flink = newlist.Flink;
mr->refs.Blink = newlist.Blink;
}
static NTSTATUS add_metadata_reloc_extent_item(_Requires_exclusive_lock_held_(_Curr_->tree_lock) device_extension* Vcb, metadata_reloc* mr) {
NTSTATUS Status;
LIST_ENTRY* le;
uint64_t rc = 0;
uint16_t inline_len;
bool all_inline = true;
metadata_reloc_ref* first_noninline = NULL;
EXTENT_ITEM* ei;
uint8_t* ptr;
inline_len = sizeof(EXTENT_ITEM);
if (!(Vcb->superblock.incompat_flags & BTRFS_INCOMPAT_FLAGS_SKINNY_METADATA))
inline_len += sizeof(EXTENT_ITEM2);
sort_metadata_reloc_refs(mr);
le = mr->refs.Flink;
while (le != &mr->refs) {
metadata_reloc_ref* ref = CONTAINING_RECORD(le, metadata_reloc_ref, list_entry);
uint16_t extlen = 0;
rc++;
if (ref->type == TYPE_TREE_BLOCK_REF)
extlen += sizeof(TREE_BLOCK_REF);
else if (ref->type == TYPE_SHARED_BLOCK_REF)
extlen += sizeof(SHARED_BLOCK_REF);
if (all_inline) {
if ((ULONG)(inline_len + 1 + extlen) > (Vcb->superblock.node_size >> 2)) {
all_inline = false;
first_noninline = ref;
} else
inline_len += extlen + 1;
}
le = le->Flink;
}
ei = ExAllocatePoolWithTag(PagedPool, inline_len, ALLOC_TAG);
if (!ei) {
ERR("out of memory\n");
return STATUS_INSUFFICIENT_RESOURCES;
}
ei->refcount = rc;
ei->generation = mr->ei->generation;
ei->flags = mr->ei->flags;
ptr = (uint8_t*)&ei[1];
if (!(Vcb->superblock.incompat_flags & BTRFS_INCOMPAT_FLAGS_SKINNY_METADATA)) {
EXTENT_ITEM2* ei2 = (EXTENT_ITEM2*)ptr;
ei2->firstitem = *(KEY*)&mr->data[1];
ei2->level = mr->data->level;
ptr += sizeof(EXTENT_ITEM2);
}
le = mr->refs.Flink;
while (le != &mr->refs) {
metadata_reloc_ref* ref = CONTAINING_RECORD(le, metadata_reloc_ref, list_entry);
if (ref == first_noninline)
break;
*ptr = ref->type;
ptr++;
if (ref->type == TYPE_TREE_BLOCK_REF) {
TREE_BLOCK_REF* tbr = (TREE_BLOCK_REF*)ptr;
tbr->offset = ref->tbr.offset;
ptr += sizeof(TREE_BLOCK_REF);
} else if (ref->type == TYPE_SHARED_BLOCK_REF) {
SHARED_BLOCK_REF* sbr = (SHARED_BLOCK_REF*)ptr;
sbr->offset = ref->parent->new_address;
ptr += sizeof(SHARED_BLOCK_REF);
}
le = le->Flink;
}
if (Vcb->superblock.incompat_flags & BTRFS_INCOMPAT_FLAGS_SKINNY_METADATA)
Status = insert_tree_item(Vcb, Vcb->extent_root, mr->new_address, TYPE_METADATA_ITEM, mr->data->level, ei, inline_len, NULL, NULL);
else
Status = insert_tree_item(Vcb, Vcb->extent_root, mr->new_address, TYPE_EXTENT_ITEM, Vcb->superblock.node_size, ei, inline_len, NULL, NULL);
if (!NT_SUCCESS(Status)) {
ERR("insert_tree_item returned %08x\n", Status);
ExFreePool(ei);
return Status;
}
if (!all_inline) {
le = &first_noninline->list_entry;
while (le != &mr->refs) {
metadata_reloc_ref* ref = CONTAINING_RECORD(le, metadata_reloc_ref, list_entry);
if (ref->type == TYPE_TREE_BLOCK_REF) {
Status = insert_tree_item(Vcb, Vcb->extent_root, mr->new_address, TYPE_TREE_BLOCK_REF, ref->tbr.offset, NULL, 0, NULL, NULL);
if (!NT_SUCCESS(Status)) {
ERR("insert_tree_item returned %08x\n", Status);
return Status;
}
} else if (ref->type == TYPE_SHARED_BLOCK_REF) {
Status = insert_tree_item(Vcb, Vcb->extent_root, mr->new_address, TYPE_SHARED_BLOCK_REF, ref->parent->new_address, NULL, 0, NULL, NULL);
if (!NT_SUCCESS(Status)) {
ERR("insert_tree_item returned %08x\n", Status);
return Status;
}
}
le = le->Flink;
}
}
if (ei->flags & EXTENT_ITEM_SHARED_BACKREFS || mr->data->flags & HEADER_FLAG_SHARED_BACKREF || !(mr->data->flags & HEADER_FLAG_MIXED_BACKREF)) {
if (mr->data->level > 0) {
uint16_t i;
internal_node* in = (internal_node*)&mr->data[1];
for (i = 0; i < mr->data->num_items; i++) {
uint64_t sbrrc = find_extent_shared_tree_refcount(Vcb, in[i].address, mr->address, NULL);
if (sbrrc > 0) {
SHARED_BLOCK_REF sbr;
sbr.offset = mr->new_address;
Status = increase_extent_refcount(Vcb, in[i].address, Vcb->superblock.node_size, TYPE_SHARED_BLOCK_REF, &sbr, NULL, 0, NULL);
if (!NT_SUCCESS(Status)) {
ERR("increase_extent_refcount returned %08x\n", Status);
return Status;
}
sbr.offset = mr->address;
Status = decrease_extent_refcount(Vcb, in[i].address, Vcb->superblock.node_size, TYPE_SHARED_BLOCK_REF, &sbr, NULL, 0,
sbr.offset, false, NULL);
if (!NT_SUCCESS(Status)) {
ERR("decrease_extent_refcount returned %08x\n", Status);
return Status;
}
}
}
} else {
uint16_t i;
leaf_node* ln = (leaf_node*)&mr->data[1];
for (i = 0; i < mr->data->num_items; i++) {
if (ln[i].key.obj_type == TYPE_EXTENT_DATA && ln[i].size >= sizeof(EXTENT_DATA) - 1 + sizeof(EXTENT_DATA2)) {
EXTENT_DATA* ed = (EXTENT_DATA*)((uint8_t*)mr->data + sizeof(tree_header) + ln[i].offset);
if (ed->type == EXTENT_TYPE_REGULAR || ed->type == EXTENT_TYPE_PREALLOC) {
EXTENT_DATA2* ed2 = (EXTENT_DATA2*)ed->data;
if (ed2->size > 0) { // not sparse
uint32_t sdrrc = find_extent_shared_data_refcount(Vcb, ed2->address, mr->address, NULL);
if (sdrrc > 0) {
SHARED_DATA_REF sdr;
chunk* c;
sdr.offset = mr->new_address;
sdr.count = sdrrc;
Status = increase_extent_refcount(Vcb, ed2->address, ed2->size, TYPE_SHARED_DATA_REF, &sdr, NULL, 0, NULL);
if (!NT_SUCCESS(Status)) {
ERR("increase_extent_refcount returned %08x\n", Status);
return Status;
}
sdr.offset = mr->address;
Status = decrease_extent_refcount(Vcb, ed2->address, ed2->size, TYPE_SHARED_DATA_REF, &sdr, NULL, 0,
sdr.offset, false, NULL);
if (!NT_SUCCESS(Status)) {
ERR("decrease_extent_refcount returned %08x\n", Status);
return Status;
}
c = get_chunk_from_address(Vcb, ed2->address);
if (c) {
// check changed_extents
ExAcquireResourceExclusiveLite(&c->changed_extents_lock, true);
le = c->changed_extents.Flink;
while (le != &c->changed_extents) {
changed_extent* ce = CONTAINING_RECORD(le, changed_extent, list_entry);
if (ce->address == ed2->address) {
LIST_ENTRY* le2;
le2 = ce->refs.Flink;
while (le2 != &ce->refs) {
changed_extent_ref* cer = CONTAINING_RECORD(le2, changed_extent_ref, list_entry);
if (cer->type == TYPE_SHARED_DATA_REF && cer->sdr.offset == mr->address) {
cer->sdr.offset = mr->new_address;
break;
}
le2 = le2->Flink;
}
le2 = ce->old_refs.Flink;
while (le2 != &ce->old_refs) {
changed_extent_ref* cer = CONTAINING_RECORD(le2, changed_extent_ref, list_entry);
if (cer->type == TYPE_SHARED_DATA_REF && cer->sdr.offset == mr->address) {
cer->sdr.offset = mr->new_address;
break;
}
le2 = le2->Flink;
}
break;
}
le = le->Flink;
}
ExReleaseResourceLite(&c->changed_extents_lock);
}
}
}
}
}
}
}
}
return STATUS_SUCCESS;
}
static NTSTATUS write_metadata_items(_Requires_exclusive_lock_held_(_Curr_->tree_lock) device_extension* Vcb, LIST_ENTRY* items,
LIST_ENTRY* data_items, chunk* c, LIST_ENTRY* rollback) {
LIST_ENTRY tree_writes, *le;
NTSTATUS Status;
traverse_ptr tp;
uint8_t level, max_level = 0;
chunk* newchunk = NULL;
InitializeListHead(&tree_writes);
le = items->Flink;
while (le != items) {
metadata_reloc* mr = CONTAINING_RECORD(le, metadata_reloc, list_entry);
LIST_ENTRY* le2;
chunk* pc;
mr->data = ExAllocatePoolWithTag(PagedPool, Vcb->superblock.node_size, ALLOC_TAG);
if (!mr->data) {
ERR("out of memory\n");
return STATUS_INSUFFICIENT_RESOURCES;
}
Status = read_data(Vcb, mr->address, Vcb->superblock.node_size, NULL, true, (uint8_t*)mr->data,
c && mr->address >= c->offset && mr->address < c->offset + c->chunk_item->size ? c : NULL, &pc, NULL, 0, false, NormalPagePriority);
if (!NT_SUCCESS(Status)) {
ERR("read_data returned %08x\n", Status);
return Status;
}
if (pc->chunk_item->type & BLOCK_FLAG_SYSTEM)
mr->system = true;
if (data_items && mr->data->level == 0) {
le2 = data_items->Flink;
while (le2 != data_items) {
data_reloc* dr = CONTAINING_RECORD(le2, data_reloc, list_entry);
leaf_node* ln = (leaf_node*)&mr->data[1];
uint16_t i;
for (i = 0; i < mr->data->num_items; i++) {
if (ln[i].key.obj_type == TYPE_EXTENT_DATA && ln[i].size >= sizeof(EXTENT_DATA) - 1 + sizeof(EXTENT_DATA2)) {
EXTENT_DATA* ed = (EXTENT_DATA*)((uint8_t*)mr->data + sizeof(tree_header) + ln[i].offset);
if (ed->type == EXTENT_TYPE_REGULAR || ed->type == EXTENT_TYPE_PREALLOC) {
EXTENT_DATA2* ed2 = (EXTENT_DATA2*)ed->data;
if (ed2->address == dr->address)
ed2->address = dr->new_address;
}
}
}
le2 = le2->Flink;
}
}
if (mr->data->level > max_level)
max_level = mr->data->level;
le2 = mr->refs.Flink;
while (le2 != &mr->refs) {
metadata_reloc_ref* ref = CONTAINING_RECORD(le2, metadata_reloc_ref, list_entry);
if (ref->type == TYPE_TREE_BLOCK_REF) {
KEY* firstitem;
root* r = NULL;
LIST_ENTRY* le3;
tree* t;
firstitem = (KEY*)&mr->data[1];
le3 = Vcb->roots.Flink;
while (le3 != &Vcb->roots) {
root* r2 = CONTAINING_RECORD(le3, root, list_entry);
if (r2->id == ref->tbr.offset) {
r = r2;
break;
}
le3 = le3->Flink;
}
if (!r) {
ERR("could not find subvol with id %I64x\n", ref->tbr.offset);
return STATUS_INTERNAL_ERROR;
}
Status = find_item_to_level(Vcb, r, &tp, firstitem, false, mr->data->level + 1, NULL);
if (!NT_SUCCESS(Status) && Status != STATUS_NOT_FOUND) {
ERR("find_item_to_level returned %08x\n", Status);
return Status;
}
t = tp.tree;
while (t && t->header.level < mr->data->level + 1) {
t = t->parent;
}
if (!t)
ref->top = true;
else {
metadata_reloc* mr2;
Status = add_metadata_reloc_parent(Vcb, items, t->header.address, &mr2, rollback);
if (!NT_SUCCESS(Status)) {
ERR("add_metadata_reloc_parent returned %08x\n", Status);
return Status;
}
ref->parent = mr2;
}
} else if (ref->type == TYPE_SHARED_BLOCK_REF) {
metadata_reloc* mr2;
Status = add_metadata_reloc_parent(Vcb, items, ref->sbr.offset, &mr2, rollback);
if (!NT_SUCCESS(Status)) {
ERR("add_metadata_reloc_parent returned %08x\n", Status);
return Status;
}
ref->parent = mr2;
}
le2 = le2->Flink;
}
le = le->Flink;
}
le = items->Flink;
while (le != items) {
metadata_reloc* mr = CONTAINING_RECORD(le, metadata_reloc, list_entry);
LIST_ENTRY* le2;
uint32_t hash;
mr->t = NULL;
hash = calc_crc32c(0xffffffff, (uint8_t*)&mr->address, sizeof(uint64_t));
le2 = Vcb->trees_ptrs[hash >> 24];
if (le2) {
while (le2 != &Vcb->trees_hash) {
tree* t = CONTAINING_RECORD(le2, tree, list_entry_hash);
if (t->header.address == mr->address) {
mr->t = t;
break;
} else if (t->hash > hash)
break;
le2 = le2->Flink;
}
}
le = le->Flink;
}
for (level = 0; level <= max_level; level++) {
le = items->Flink;
while (le != items) {
metadata_reloc* mr = CONTAINING_RECORD(le, metadata_reloc, list_entry);
if (mr->data->level == level) {
bool done = false;
LIST_ENTRY* le2;
tree_write* tw;
uint64_t flags;
tree* t3;
if (mr->system)
flags = Vcb->system_flags;
else if (Vcb->superblock.incompat_flags & BTRFS_INCOMPAT_FLAGS_MIXED_GROUPS)
flags = Vcb->data_flags;
else
flags = Vcb->metadata_flags;
if (newchunk) {
acquire_chunk_lock(newchunk, Vcb);
if (newchunk->chunk_item->type == flags && find_metadata_address_in_chunk(Vcb, newchunk, &mr->new_address)) {
newchunk->used += Vcb->superblock.node_size;
space_list_subtract(newchunk, false, mr->new_address, Vcb->superblock.node_size, rollback);
done = true;
}
release_chunk_lock(newchunk, Vcb);
}
if (!done) {
ExAcquireResourceExclusiveLite(&Vcb->chunk_lock, true);
le2 = Vcb->chunks.Flink;
while (le2 != &Vcb->chunks) {
chunk* c2 = CONTAINING_RECORD(le2, chunk, list_entry);
if (!c2->readonly && !c2->reloc && c2 != newchunk && c2->chunk_item->type == flags) {
acquire_chunk_lock(c2, Vcb);
if ((c2->chunk_item->size - c2->used) >= Vcb->superblock.node_size) {
if (find_metadata_address_in_chunk(Vcb, c2, &mr->new_address)) {
c2->used += Vcb->superblock.node_size;
space_list_subtract(c2, false, mr->new_address, Vcb->superblock.node_size, rollback);
release_chunk_lock(c2, Vcb);
newchunk = c2;
done = true;
break;
}
}
release_chunk_lock(c2, Vcb);
}
le2 = le2->Flink;
}
// allocate new chunk if necessary
if (!done) {
Status = alloc_chunk(Vcb, flags, &newchunk, false);
if (!NT_SUCCESS(Status)) {
ERR("alloc_chunk returned %08x\n", Status);
ExReleaseResourceLite(&Vcb->chunk_lock);
goto end;
}
acquire_chunk_lock(newchunk, Vcb);
newchunk->balance_num = Vcb->balance.balance_num;
if (!find_metadata_address_in_chunk(Vcb, newchunk, &mr->new_address)) {
release_chunk_lock(newchunk, Vcb);
ExReleaseResourceLite(&Vcb->chunk_lock);
ERR("could not find address in new chunk\n");
Status = STATUS_DISK_FULL;
goto end;
} else {
newchunk->used += Vcb->superblock.node_size;
space_list_subtract(newchunk, false, mr->new_address, Vcb->superblock.node_size, rollback);
}
release_chunk_lock(newchunk, Vcb);
}
ExReleaseResourceLite(&Vcb->chunk_lock);
}
// update parents
le2 = mr->refs.Flink;
while (le2 != &mr->refs) {
metadata_reloc_ref* ref = CONTAINING_RECORD(le2, metadata_reloc_ref, list_entry);
if (ref->parent) {
uint16_t i;
internal_node* in = (internal_node*)&ref->parent->data[1];
for (i = 0; i < ref->parent->data->num_items; i++) {
if (in[i].address == mr->address) {
in[i].address = mr->new_address;
break;
}
}
if (ref->parent->t) {
LIST_ENTRY* le3;
le3 = ref->parent->t->itemlist.Flink;
while (le3 != &ref->parent->t->itemlist) {
tree_data* td = CONTAINING_RECORD(le3, tree_data, list_entry);
if (!td->inserted && td->treeholder.address == mr->address)
td->treeholder.address = mr->new_address;
le3 = le3->Flink;
}
}
} else if (ref->top && ref->type == TYPE_TREE_BLOCK_REF) {
LIST_ENTRY* le3;
root* r = NULL;
// alter ROOT_ITEM
le3 = Vcb->roots.Flink;
while (le3 != &Vcb->roots) {
root* r2 = CONTAINING_RECORD(le3, root, list_entry);
if (r2->id == ref->tbr.offset) {
r = r2;
break;
}
le3 = le3->Flink;
}
if (r) {
r->treeholder.address = mr->new_address;
if (r == Vcb->root_root)
Vcb->superblock.root_tree_addr = mr->new_address;
else if (r == Vcb->chunk_root)
Vcb->superblock.chunk_tree_addr = mr->new_address;
else if (r->root_item.block_number == mr->address) {
KEY searchkey;
ROOT_ITEM* ri;
r->root_item.block_number = mr->new_address;
searchkey.obj_id = r->id;
searchkey.obj_type = TYPE_ROOT_ITEM;
searchkey.offset = 0xffffffffffffffff;
Status = find_item(Vcb, Vcb->root_root, &tp, &searchkey, false, NULL);
if (!NT_SUCCESS(Status)) {
ERR("find_item returned %08x\n", Status);
goto end;
}
if (tp.item->key.obj_id != searchkey.obj_id || tp.item->key.obj_type != searchkey.obj_type) {
ERR("could not find ROOT_ITEM for tree %I64x\n", searchkey.obj_id);
Status = STATUS_INTERNAL_ERROR;
goto end;
}
ri = ExAllocatePoolWithTag(PagedPool, sizeof(ROOT_ITEM), ALLOC_TAG);
if (!ri) {
ERR("out of memory\n");
Status = STATUS_INSUFFICIENT_RESOURCES;
goto end;
}
RtlCopyMemory(ri, &r->root_item, sizeof(ROOT_ITEM));
Status = delete_tree_item(Vcb, &tp);
if (!NT_SUCCESS(Status)) {
ERR("delete_tree_item returned %08x\n", Status);
goto end;
}
Status = insert_tree_item(Vcb, Vcb->root_root, tp.item->key.obj_id, tp.item->key.obj_type, tp.item->key.offset, ri, sizeof(ROOT_ITEM), NULL, NULL);
if (!NT_SUCCESS(Status)) {
ERR("insert_tree_item returned %08x\n", Status);
goto end;
}
}
}
}
le2 = le2->Flink;
}
mr->data->address = mr->new_address;
t3 = mr->t;
while (t3) {
uint8_t h;
bool inserted;
tree* t4 = NULL;
// check if tree loaded more than once
if (t3->list_entry.Flink != &Vcb->trees_hash) {
tree* nt = CONTAINING_RECORD(t3->list_entry_hash.Flink, tree, list_entry_hash);
if (nt->header.address == t3->header.address)
t4 = nt;
}
t3->header.address = mr->new_address;
h = t3->hash >> 24;
if (Vcb->trees_ptrs[h] == &t3->list_entry_hash) {
if (t3->list_entry_hash.Flink == &Vcb->trees_hash)
Vcb->trees_ptrs[h] = NULL;
else {
tree* t2 = CONTAINING_RECORD(t3->list_entry_hash.Flink, tree, list_entry_hash);
if (t2->hash >> 24 == h)
Vcb->trees_ptrs[h] = &t2->list_entry_hash;
else
Vcb->trees_ptrs[h] = NULL;
}
}
RemoveEntryList(&t3->list_entry_hash);
t3->hash = calc_crc32c(0xffffffff, (uint8_t*)&t3->header.address, sizeof(uint64_t));
h = t3->hash >> 24;
if (!Vcb->trees_ptrs[h]) {
uint8_t h2 = h;
le2 = Vcb->trees_hash.Flink;
if (h2 > 0) {
h2--;
do {
if (Vcb->trees_ptrs[h2]) {
le2 = Vcb->trees_ptrs[h2];
break;
}
h2--;
} while (h2 > 0);
}
} else
le2 = Vcb->trees_ptrs[h];
inserted = false;
while (le2 != &Vcb->trees_hash) {
tree* t2 = CONTAINING_RECORD(le2, tree, list_entry_hash);
if (t2->hash >= t3->hash) {
InsertHeadList(le2->Blink, &t3->list_entry_hash);
inserted = true;
break;
}
le2 = le2->Flink;
}
if (!inserted)
InsertTailList(&Vcb->trees_hash, &t3->list_entry_hash);
if (!Vcb->trees_ptrs[h] || t3->list_entry_hash.Flink == Vcb->trees_ptrs[h])
Vcb->trees_ptrs[h] = &t3->list_entry_hash;
if (data_items && level == 0) {
le2 = data_items->Flink;
while (le2 != data_items) {
data_reloc* dr = CONTAINING_RECORD(le2, data_reloc, list_entry);
LIST_ENTRY* le3 = t3->itemlist.Flink;
while (le3 != &t3->itemlist) {
tree_data* td = CONTAINING_RECORD(le3, tree_data, list_entry);
if (!td->inserted && td->key.obj_type == TYPE_EXTENT_DATA && td->size >= sizeof(EXTENT_DATA) - 1 + sizeof(EXTENT_DATA2)) {
EXTENT_DATA* ed = (EXTENT_DATA*)td->data;
if (ed->type == EXTENT_TYPE_REGULAR || ed->type == EXTENT_TYPE_PREALLOC) {
EXTENT_DATA2* ed2 = (EXTENT_DATA2*)ed->data;
if (ed2->address == dr->address)
ed2->address = dr->new_address;
}
}
le3 = le3->Flink;
}
le2 = le2->Flink;
}
}
t3 = t4;
}
*((uint32_t*)mr->data) = ~calc_crc32c(0xffffffff, (uint8_t*)&mr->data->fs_uuid, Vcb->superblock.node_size - sizeof(mr->data->csum));
tw = ExAllocatePoolWithTag(PagedPool, sizeof(tree_write), ALLOC_TAG);
if (!tw) {
ERR("out of memory\n");
Status = STATUS_INSUFFICIENT_RESOURCES;
goto end;
}
tw->address = mr->new_address;
tw->length = Vcb->superblock.node_size;
tw->data = (uint8_t*)mr->data;
tw->allocated = false;
if (IsListEmpty(&tree_writes))
InsertTailList(&tree_writes, &tw->list_entry);
else {
bool inserted = false;
le2 = tree_writes.Flink;
while (le2 != &tree_writes) {
tree_write* tw2 = CONTAINING_RECORD(le2, tree_write, list_entry);
if (tw2->address > tw->address) {
InsertHeadList(le2->Blink, &tw->list_entry);
inserted = true;
break;
}
le2 = le2->Flink;
}
if (!inserted)
InsertTailList(&tree_writes, &tw->list_entry);
}
}
le = le->Flink;
}
}
Status = do_tree_writes(Vcb, &tree_writes, true);
if (!NT_SUCCESS(Status)) {
ERR("do_tree_writes returned %08x\n", Status);
goto end;
}
le = items->Flink;
while (le != items) {
metadata_reloc* mr = CONTAINING_RECORD(le, metadata_reloc, list_entry);
Status = add_metadata_reloc_extent_item(Vcb, mr);
if (!NT_SUCCESS(Status)) {
ERR("add_metadata_reloc_extent_item returned %08x\n", Status);
goto end;
}
le = le->Flink;
}
Status = STATUS_SUCCESS;
end:
while (!IsListEmpty(&tree_writes)) {
tree_write* tw = CONTAINING_RECORD(RemoveHeadList(&tree_writes), tree_write, list_entry);
if (tw->allocated)
ExFreePool(tw->data);
ExFreePool(tw);
}
return Status;
}
static NTSTATUS balance_metadata_chunk(device_extension* Vcb, chunk* c, bool* changed) {
KEY searchkey;
traverse_ptr tp;
NTSTATUS Status;
bool b;
LIST_ENTRY items, rollback;
uint32_t loaded = 0;
TRACE("chunk %I64x\n", c->offset);
InitializeListHead(&rollback);
InitializeListHead(&items);
ExAcquireResourceExclusiveLite(&Vcb->tree_lock, true);
searchkey.obj_id = c->offset;
searchkey.obj_type = TYPE_METADATA_ITEM;
searchkey.offset = 0xffffffffffffffff;
Status = find_item(Vcb, Vcb->extent_root, &tp, &searchkey, false, NULL);
if (!NT_SUCCESS(Status)) {
ERR("find_item returned %08x\n", Status);
goto end;
}
do {
traverse_ptr next_tp;
if (tp.item->key.obj_id >= c->offset + c->chunk_item->size)
break;
if (tp.item->key.obj_id >= c->offset && (tp.item->key.obj_type == TYPE_EXTENT_ITEM || tp.item->key.obj_type == TYPE_METADATA_ITEM)) {
bool tree = false, skinny = false;
if (tp.item->key.obj_type == TYPE_METADATA_ITEM && tp.item->size >= sizeof(EXTENT_ITEM)) {
tree = true;
skinny = true;
} else if (tp.item->key.obj_type == TYPE_EXTENT_ITEM && tp.item->key.offset == Vcb->superblock.node_size &&
tp.item->size >= sizeof(EXTENT_ITEM)) {
EXTENT_ITEM* ei = (EXTENT_ITEM*)tp.item->data;
if (ei->flags & EXTENT_ITEM_TREE_BLOCK)
tree = true;
}
if (tree) {
Status = add_metadata_reloc(Vcb, &items, &tp, skinny, NULL, c, &rollback);
if (!NT_SUCCESS(Status)) {
ERR("add_metadata_reloc returned %08x\n", Status);
goto end;
}
loaded++;
if (loaded >= 64) // only do 64 at a time
break;
}
}
b = find_next_item(Vcb, &tp, &next_tp, false, NULL);
if (b)
tp = next_tp;
} while (b);
if (IsListEmpty(&items)) {
*changed = false;
Status = STATUS_SUCCESS;
goto end;
} else
*changed = true;
Status = write_metadata_items(Vcb, &items, NULL, c, &rollback);
if (!NT_SUCCESS(Status)) {
ERR("write_metadata_items returned %08x\n", Status);
goto end;
}
Status = STATUS_SUCCESS;
Vcb->need_write = true;
end:
if (NT_SUCCESS(Status)) {
Status = do_write(Vcb, NULL);
if (!NT_SUCCESS(Status))
ERR("do_write returned %08x\n", Status);
}
if (NT_SUCCESS(Status))
clear_rollback(&rollback);
else
do_rollback(Vcb, &rollback);
free_trees(Vcb);
ExReleaseResourceLite(&Vcb->tree_lock);
while (!IsListEmpty(&items)) {
metadata_reloc* mr = CONTAINING_RECORD(RemoveHeadList(&items), metadata_reloc, list_entry);
while (!IsListEmpty(&mr->refs)) {
metadata_reloc_ref* ref = CONTAINING_RECORD(RemoveHeadList(&mr->refs), metadata_reloc_ref, list_entry);
ExFreePool(ref);
}
if (mr->data)
ExFreePool(mr->data);
ExFreePool(mr);
}
return Status;
}
static NTSTATUS data_reloc_add_tree_edr(_Requires_lock_held_(_Curr_->tree_lock) device_extension* Vcb, LIST_ENTRY* metadata_items,
data_reloc* dr, EXTENT_DATA_REF* edr, LIST_ENTRY* rollback) {
NTSTATUS Status;
LIST_ENTRY* le;
KEY searchkey;
traverse_ptr tp;
root* r = NULL;
metadata_reloc* mr;
uint64_t last_tree = 0;
data_reloc_ref* ref;
le = Vcb->roots.Flink;
while (le != &Vcb->roots) {
root* r2 = CONTAINING_RECORD(le, root, list_entry);
if (r2->id == edr->root) {
r = r2;
break;
}
le = le->Flink;
}
if (!r) {
ERR("could not find subvol %I64x\n", edr->count);
return STATUS_INTERNAL_ERROR;
}
searchkey.obj_id = edr->objid;
searchkey.obj_type = TYPE_EXTENT_DATA;
searchkey.offset = 0;
Status = find_item(Vcb, r, &tp, &searchkey, false, NULL);
if (!NT_SUCCESS(Status)) {
ERR("find_item returned %08x\n", Status);
return Status;
}
if (tp.item->key.obj_id < searchkey.obj_id || (tp.item->key.obj_id == searchkey.obj_id && tp.item->key.obj_type < searchkey.obj_type)) {
traverse_ptr tp2;
if (find_next_item(Vcb, &tp, &tp2, false, NULL))
tp = tp2;
else {
ERR("could not find EXTENT_DATA for inode %I64x in root %I64x\n", searchkey.obj_id, r->id);
return STATUS_INTERNAL_ERROR;
}
}
ref = NULL;
while (tp.item->key.obj_id == searchkey.obj_id && tp.item->key.obj_type == searchkey.obj_type) {
traverse_ptr tp2;
if (tp.item->size >= sizeof(EXTENT_DATA)) {
EXTENT_DATA* ed = (EXTENT_DATA*)tp.item->data;
if ((ed->type == EXTENT_TYPE_PREALLOC || ed->type == EXTENT_TYPE_REGULAR) && tp.item->size >= offsetof(EXTENT_DATA, data[0]) + sizeof(EXTENT_DATA2)) {
EXTENT_DATA2* ed2 = (EXTENT_DATA2*)ed->data;
if (ed2->address == dr->address && ed2->size == dr->size && tp.item->key.offset - ed2->offset == edr->offset) {
if (ref && last_tree == tp.tree->header.address)
ref->edr.count++;
else {
ref = ExAllocatePoolWithTag(PagedPool, sizeof(data_reloc_ref), ALLOC_TAG);
if (!ref) {
ERR("out of memory\n");
return STATUS_INSUFFICIENT_RESOURCES;
}
ref->type = TYPE_EXTENT_DATA_REF;
RtlCopyMemory(&ref->edr, edr, sizeof(EXTENT_DATA_REF));
ref->edr.count = 1;
Status = add_metadata_reloc_parent(Vcb, metadata_items, tp.tree->header.address, &mr, rollback);
if (!NT_SUCCESS(Status)) {
ERR("add_metadata_reloc_parent returned %08x\n", Status);
ExFreePool(ref);
return Status;
}
last_tree = tp.tree->header.address;
ref->parent = mr;
InsertTailList(&dr->refs, &ref->list_entry);
}
}
}
}
if (find_next_item(Vcb, &tp, &tp2, false, NULL))
tp = tp2;
else
break;
}
return STATUS_SUCCESS;
}
static NTSTATUS add_data_reloc(_Requires_exclusive_lock_held_(_Curr_->tree_lock) device_extension* Vcb, LIST_ENTRY* items, LIST_ENTRY* metadata_items,
traverse_ptr* tp, chunk* c, LIST_ENTRY* rollback) {
NTSTATUS Status;
data_reloc* dr;
EXTENT_ITEM* ei;
uint16_t len;
uint64_t inline_rc;
uint8_t* ptr;
dr = ExAllocatePoolWithTag(PagedPool, sizeof(data_reloc), ALLOC_TAG);
if (!dr) {
ERR("out of memory\n");
return STATUS_INSUFFICIENT_RESOURCES;
}
dr->address = tp->item->key.obj_id;
dr->size = tp->item->key.offset;
dr->ei = (EXTENT_ITEM*)tp->item->data;
InitializeListHead(&dr->refs);
Status = delete_tree_item(Vcb, tp);
if (!NT_SUCCESS(Status)) {
ERR("delete_tree_item returned %08x\n", Status);
return Status;
}
if (!c)
c = get_chunk_from_address(Vcb, tp->item->key.obj_id);
if (c) {
acquire_chunk_lock(c, Vcb);
c->used -= tp->item->key.offset;
space_list_add(c, tp->item->key.obj_id, tp->item->key.offset, rollback);
release_chunk_lock(c, Vcb);
}
ei = (EXTENT_ITEM*)tp->item->data;
inline_rc = 0;
len = tp->item->size - sizeof(EXTENT_ITEM);
ptr = (uint8_t*)tp->item->data + sizeof(EXTENT_ITEM);
while (len > 0) {
uint8_t secttype = *ptr;
uint16_t sectlen = secttype == TYPE_EXTENT_DATA_REF ? sizeof(EXTENT_DATA_REF) : (secttype == TYPE_SHARED_DATA_REF ? sizeof(SHARED_DATA_REF) : 0);
len--;
if (sectlen > len) {
ERR("(%I64x,%x,%I64x): %x bytes left, expecting at least %x\n", tp->item->key.obj_id, tp->item->key.obj_type, tp->item->key.offset, len, sectlen);
return STATUS_INTERNAL_ERROR;
}
if (sectlen == 0) {
ERR("(%I64x,%x,%I64x): unrecognized extent type %x\n", tp->item->key.obj_id, tp->item->key.obj_type, tp->item->key.offset, secttype);
return STATUS_INTERNAL_ERROR;
}
if (secttype == TYPE_EXTENT_DATA_REF) {
EXTENT_DATA_REF* edr = (EXTENT_DATA_REF*)(ptr + sizeof(uint8_t));
inline_rc += edr->count;
Status = data_reloc_add_tree_edr(Vcb, metadata_items, dr, edr, rollback);
if (!NT_SUCCESS(Status)) {
ERR("data_reloc_add_tree_edr returned %08x\n", Status);
return Status;
}
} else if (secttype == TYPE_SHARED_DATA_REF) {
metadata_reloc* mr;
data_reloc_ref* ref;
ref = ExAllocatePoolWithTag(PagedPool, sizeof(data_reloc_ref), ALLOC_TAG);
if (!ref) {
ERR("out of memory\n");
return STATUS_INSUFFICIENT_RESOURCES;
}
ref->type = TYPE_SHARED_DATA_REF;
RtlCopyMemory(&ref->sdr, ptr + sizeof(uint8_t), sizeof(SHARED_DATA_REF));
inline_rc += ref->sdr.count;
Status = add_metadata_reloc_parent(Vcb, metadata_items, ref->sdr.offset, &mr, rollback);
if (!NT_SUCCESS(Status)) {
ERR("add_metadata_reloc_parent returned %08x\n", Status);
ExFreePool(ref);
return Status;
}
ref->parent = mr;
InsertTailList(&dr->refs, &ref->list_entry);
} else {
ERR("unexpected tree type %x\n", secttype);
return STATUS_INTERNAL_ERROR;
}
len -= sectlen;
ptr += sizeof(uint8_t) + sectlen;
}
if (inline_rc < ei->refcount) { // look for non-inline entries
traverse_ptr tp2 = *tp, next_tp;
while (find_next_item(Vcb, &tp2, &next_tp, false, NULL)) {
tp2 = next_tp;
if (tp2.item->key.obj_id == tp->item->key.obj_id) {
if (tp2.item->key.obj_type == TYPE_EXTENT_DATA_REF && tp2.item->size >= sizeof(EXTENT_DATA_REF)) {
Status = data_reloc_add_tree_edr(Vcb, metadata_items, dr, (EXTENT_DATA_REF*)tp2.item->data, rollback);
if (!NT_SUCCESS(Status)) {
ERR("data_reloc_add_tree_edr returned %08x\n", Status);
return Status;
}
Status = delete_tree_item(Vcb, &tp2);
if (!NT_SUCCESS(Status)) {
ERR("delete_tree_item returned %08x\n", Status);
return Status;
}
} else if (tp2.item->key.obj_type == TYPE_SHARED_DATA_REF && tp2.item->size >= sizeof(uint32_t)) {
metadata_reloc* mr;
data_reloc_ref* ref;
ref = ExAllocatePoolWithTag(PagedPool, sizeof(data_reloc_ref), ALLOC_TAG);
if (!ref) {
ERR("out of memory\n");
return STATUS_INSUFFICIENT_RESOURCES;
}
ref->type = TYPE_SHARED_DATA_REF;
ref->sdr.offset = tp2.item->key.offset;
ref->sdr.count = *((uint32_t*)tp2.item->data);
Status = add_metadata_reloc_parent(Vcb, metadata_items, ref->sdr.offset, &mr, rollback);
if (!NT_SUCCESS(Status)) {
ERR("add_metadata_reloc_parent returned %08x\n", Status);
ExFreePool(ref);
return Status;
}
ref->parent = mr;
InsertTailList(&dr->refs, &ref->list_entry);
Status = delete_tree_item(Vcb, &tp2);
if (!NT_SUCCESS(Status)) {
ERR("delete_tree_item returned %08x\n", Status);
return Status;
}
}
} else
break;
}
}
InsertTailList(items, &dr->list_entry);
return STATUS_SUCCESS;
}
static void sort_data_reloc_refs(data_reloc* dr) {
LIST_ENTRY newlist, *le;
if (IsListEmpty(&dr->refs))
return;
// insertion sort
InitializeListHead(&newlist);
while (!IsListEmpty(&dr->refs)) {
data_reloc_ref* ref = CONTAINING_RECORD(RemoveHeadList(&dr->refs), data_reloc_ref, list_entry);
bool inserted = false;
if (ref->type == TYPE_EXTENT_DATA_REF)
ref->hash = get_extent_data_ref_hash2(ref->edr.root, ref->edr.objid, ref->edr.offset);
else if (ref->type == TYPE_SHARED_DATA_REF)
ref->hash = ref->parent->new_address;
le = newlist.Flink;
while (le != &newlist) {
data_reloc_ref* ref2 = CONTAINING_RECORD(le, data_reloc_ref, list_entry);
if (ref->type < ref2->type || (ref->type == ref2->type && ref->hash > ref2->hash)) {
InsertHeadList(le->Blink, &ref->list_entry);
inserted = true;
break;
}
le = le->Flink;
}
if (!inserted)
InsertTailList(&newlist, &ref->list_entry);
}
le = newlist.Flink;
while (le != &newlist) {
data_reloc_ref* ref = CONTAINING_RECORD(le, data_reloc_ref, list_entry);
if (le->Flink != &newlist) {
data_reloc_ref* ref2 = CONTAINING_RECORD(le->Flink, data_reloc_ref, list_entry);
if (ref->type == TYPE_EXTENT_DATA_REF && ref2->type == TYPE_EXTENT_DATA_REF && ref->edr.root == ref2->edr.root &&
ref->edr.objid == ref2->edr.objid && ref->edr.offset == ref2->edr.offset) {
RemoveEntryList(&ref2->list_entry);
ref->edr.count += ref2->edr.count;
ExFreePool(ref2);
continue;
}
}
le = le->Flink;
}
newlist.Flink->Blink = &dr->refs;
newlist.Blink->Flink = &dr->refs;
dr->refs.Flink = newlist.Flink;
dr->refs.Blink = newlist.Blink;
}
static NTSTATUS add_data_reloc_extent_item(_Requires_exclusive_lock_held_(_Curr_->tree_lock) device_extension* Vcb, data_reloc* dr) {
NTSTATUS Status;
LIST_ENTRY* le;
uint64_t rc = 0;
uint16_t inline_len;
bool all_inline = true;
data_reloc_ref* first_noninline = NULL;
EXTENT_ITEM* ei;
uint8_t* ptr;
inline_len = sizeof(EXTENT_ITEM);
sort_data_reloc_refs(dr);
le = dr->refs.Flink;
while (le != &dr->refs) {
data_reloc_ref* ref = CONTAINING_RECORD(le, data_reloc_ref, list_entry);
uint16_t extlen = 0;
if (ref->type == TYPE_EXTENT_DATA_REF) {
extlen += sizeof(EXTENT_DATA_REF);
rc += ref->edr.count;
} else if (ref->type == TYPE_SHARED_DATA_REF) {
extlen += sizeof(SHARED_DATA_REF);
rc++;
}
if (all_inline) {
if ((ULONG)(inline_len + 1 + extlen) > (Vcb->superblock.node_size >> 2)) {
all_inline = false;
first_noninline = ref;
} else
inline_len += extlen + 1;
}
le = le->Flink;
}
ei = ExAllocatePoolWithTag(PagedPool, inline_len, ALLOC_TAG);
if (!ei) {
ERR("out of memory\n");
return STATUS_INSUFFICIENT_RESOURCES;
}
ei->refcount = rc;
ei->generation = dr->ei->generation;
ei->flags = dr->ei->flags;
ptr = (uint8_t*)&ei[1];
le = dr->refs.Flink;
while (le != &dr->refs) {
data_reloc_ref* ref = CONTAINING_RECORD(le, data_reloc_ref, list_entry);
if (ref == first_noninline)
break;
*ptr = ref->type;
ptr++;
if (ref->type == TYPE_EXTENT_DATA_REF) {
EXTENT_DATA_REF* edr = (EXTENT_DATA_REF*)ptr;
RtlCopyMemory(edr, &ref->edr, sizeof(EXTENT_DATA_REF));
ptr += sizeof(EXTENT_DATA_REF);
} else if (ref->type == TYPE_SHARED_DATA_REF) {
SHARED_DATA_REF* sdr = (SHARED_DATA_REF*)ptr;
sdr->offset = ref->parent->new_address;
sdr->count = ref->sdr.count;
ptr += sizeof(SHARED_DATA_REF);
}
le = le->Flink;
}
Status = insert_tree_item(Vcb, Vcb->extent_root, dr->new_address, TYPE_EXTENT_ITEM, dr->size, ei, inline_len, NULL, NULL);
if (!NT_SUCCESS(Status)) {
ERR("insert_tree_item returned %08x\n", Status);
return Status;
}
if (!all_inline) {
le = &first_noninline->list_entry;
while (le != &dr->refs) {
data_reloc_ref* ref = CONTAINING_RECORD(le, data_reloc_ref, list_entry);
if (ref->type == TYPE_EXTENT_DATA_REF) {
EXTENT_DATA_REF* edr;
edr = ExAllocatePoolWithTag(PagedPool, sizeof(EXTENT_DATA_REF), ALLOC_TAG);
if (!edr) {
ERR("out of memory\n");
return STATUS_INSUFFICIENT_RESOURCES;
}
RtlCopyMemory(edr, &ref->edr, sizeof(EXTENT_DATA_REF));
Status = insert_tree_item(Vcb, Vcb->extent_root, dr->new_address, TYPE_EXTENT_DATA_REF, ref->hash, edr, sizeof(EXTENT_DATA_REF), NULL, NULL);
if (!NT_SUCCESS(Status)) {
ERR("insert_tree_item returned %08x\n", Status);
return Status;
}
} else if (ref->type == TYPE_SHARED_DATA_REF) {
uint32_t* sdr;
sdr = ExAllocatePoolWithTag(PagedPool, sizeof(uint32_t), ALLOC_TAG);
if (!sdr) {
ERR("out of memory\n");
return STATUS_INSUFFICIENT_RESOURCES;
}
*sdr = ref->sdr.count;
Status = insert_tree_item(Vcb, Vcb->extent_root, dr->new_address, TYPE_SHARED_DATA_REF, ref->parent->new_address, sdr, sizeof(uint32_t), NULL, NULL);
if (!NT_SUCCESS(Status)) {
ERR("insert_tree_item returned %08x\n", Status);
return Status;
}
}
le = le->Flink;
}
}
return STATUS_SUCCESS;
}
static NTSTATUS balance_data_chunk(device_extension* Vcb, chunk* c, bool* changed) {
KEY searchkey;
traverse_ptr tp;
NTSTATUS Status;
bool b;
LIST_ENTRY items, metadata_items, rollback, *le;
uint64_t loaded = 0, num_loaded = 0;
chunk* newchunk = NULL;
uint8_t* data = NULL;
TRACE("chunk %I64x\n", c->offset);
InitializeListHead(&rollback);
InitializeListHead(&items);
InitializeListHead(&metadata_items);
ExAcquireResourceExclusiveLite(&Vcb->tree_lock, true);
searchkey.obj_id = c->offset;
searchkey.obj_type = TYPE_EXTENT_ITEM;
searchkey.offset = 0xffffffffffffffff;
Status = find_item(Vcb, Vcb->extent_root, &tp, &searchkey, false, NULL);
if (!NT_SUCCESS(Status)) {
ERR("find_item returned %08x\n", Status);
goto end;
}
do {
traverse_ptr next_tp;
if (tp.item->key.obj_id >= c->offset + c->chunk_item->size)
break;
if (tp.item->key.obj_id >= c->offset && tp.item->key.obj_type == TYPE_EXTENT_ITEM) {
bool tree = false;
if (tp.item->key.obj_type == TYPE_EXTENT_ITEM && tp.item->size >= sizeof(EXTENT_ITEM)) {
EXTENT_ITEM* ei = (EXTENT_ITEM*)tp.item->data;
if (ei->flags & EXTENT_ITEM_TREE_BLOCK)
tree = true;
}
if (!tree) {
Status = add_data_reloc(Vcb, &items, &metadata_items, &tp, c, &rollback);
if (!NT_SUCCESS(Status)) {
ERR("add_data_reloc returned %08x\n", Status);
goto end;
}
loaded += tp.item->key.offset;
num_loaded++;
if (loaded >= 0x1000000 || num_loaded >= 100) // only do so much at a time, so we don't block too obnoxiously
break;
}
}
b = find_next_item(Vcb, &tp, &next_tp, false, NULL);
if (b)
tp = next_tp;
} while (b);
if (IsListEmpty(&items)) {
*changed = false;
Status = STATUS_SUCCESS;
goto end;
} else
*changed = true;
data = ExAllocatePoolWithTag(PagedPool, BALANCE_UNIT, ALLOC_TAG);
if (!data) {
ERR("out of memory\n");
Status = STATUS_INSUFFICIENT_RESOURCES;
goto end;
}
le = items.Flink;
while (le != &items) {
data_reloc* dr = CONTAINING_RECORD(le, data_reloc, list_entry);
bool done = false;
LIST_ENTRY* le2;
uint32_t* csum;
RTL_BITMAP bmp;
ULONG* bmparr;
ULONG bmplen, runlength, index, lastoff;
if (newchunk) {
acquire_chunk_lock(newchunk, Vcb);
if (find_data_address_in_chunk(Vcb, newchunk, dr->size, &dr->new_address)) {
newchunk->used += dr->size;
space_list_subtract(newchunk, false, dr->new_address, dr->size, &rollback);
done = true;
}
release_chunk_lock(newchunk, Vcb);
}
if (!done) {
ExAcquireResourceExclusiveLite(&Vcb->chunk_lock, true);
le2 = Vcb->chunks.Flink;
while (le2 != &Vcb->chunks) {
chunk* c2 = CONTAINING_RECORD(le2, chunk, list_entry);
if (!c2->readonly && !c2->reloc && c2 != newchunk && c2->chunk_item->type == Vcb->data_flags) {
acquire_chunk_lock(c2, Vcb);
if ((c2->chunk_item->size - c2->used) >= dr->size) {
if (find_data_address_in_chunk(Vcb, c2, dr->size, &dr->new_address)) {
c2->used += dr->size;
space_list_subtract(c2, false, dr->new_address, dr->size, &rollback);
release_chunk_lock(c2, Vcb);
newchunk = c2;
done = true;
break;
}
}
release_chunk_lock(c2, Vcb);
}
le2 = le2->Flink;
}
// allocate new chunk if necessary
if (!done) {
Status = alloc_chunk(Vcb, Vcb->data_flags, &newchunk, false);
if (!NT_SUCCESS(Status)) {
ERR("alloc_chunk returned %08x\n", Status);
ExReleaseResourceLite(&Vcb->chunk_lock);
goto end;
}
acquire_chunk_lock(newchunk, Vcb);
newchunk->balance_num = Vcb->balance.balance_num;
if (!find_data_address_in_chunk(Vcb, newchunk, dr->size, &dr->new_address)) {
release_chunk_lock(newchunk, Vcb);
ExReleaseResourceLite(&Vcb->chunk_lock);
ERR("could not find address in new chunk\n");
Status = STATUS_DISK_FULL;
goto end;
} else {
newchunk->used += dr->size;
space_list_subtract(newchunk, false, dr->new_address, dr->size, &rollback);
}
release_chunk_lock(newchunk, Vcb);
}
ExReleaseResourceLite(&Vcb->chunk_lock);
}
dr->newchunk = newchunk;
bmplen = (ULONG)(dr->size / Vcb->superblock.sector_size);
bmparr = ExAllocatePoolWithTag(PagedPool, (ULONG)sector_align(bmplen + 1, sizeof(ULONG)), ALLOC_TAG);
if (!bmparr) {
ERR("out of memory\n");
Status = STATUS_INSUFFICIENT_RESOURCES;
goto end;
}
csum = ExAllocatePoolWithTag(PagedPool, (ULONG)(dr->size * sizeof(uint32_t) / Vcb->superblock.sector_size), ALLOC_TAG);
if (!csum) {
ERR("out of memory\n");
ExFreePool(bmparr);
Status = STATUS_INSUFFICIENT_RESOURCES;
goto end;
}
RtlInitializeBitMap(&bmp, bmparr, bmplen);
RtlSetAllBits(&bmp); // 1 = no csum, 0 = csum
searchkey.obj_id = EXTENT_CSUM_ID;
searchkey.obj_type = TYPE_EXTENT_CSUM;
searchkey.offset = dr->address;
Status = find_item(Vcb, Vcb->checksum_root, &tp, &searchkey, false, NULL);
if (!NT_SUCCESS(Status) && Status != STATUS_NOT_FOUND) {
ERR("find_item returned %08x\n", Status);
ExFreePool(csum);
ExFreePool(bmparr);
goto end;
}
if (Status != STATUS_NOT_FOUND) {
do {
traverse_ptr next_tp;
if (tp.item->key.obj_type == TYPE_EXTENT_CSUM) {
if (tp.item->key.offset >= dr->address + dr->size)
break;
else if (tp.item->size >= sizeof(uint32_t) && tp.item->key.offset + (tp.item->size * Vcb->superblock.sector_size / sizeof(uint32_t)) >= dr->address) {
uint64_t cs = max(dr->address, tp.item->key.offset);
uint64_t ce = min(dr->address + dr->size, tp.item->key.offset + (tp.item->size * Vcb->superblock.sector_size / sizeof(uint32_t)));
RtlCopyMemory(csum + ((cs - dr->address) / Vcb->superblock.sector_size),
tp.item->data + ((cs - tp.item->key.offset) * sizeof(uint32_t) / Vcb->superblock.sector_size),
(ULONG)((ce - cs) * sizeof(uint32_t) / Vcb->superblock.sector_size));
RtlClearBits(&bmp, (ULONG)((cs - dr->address) / Vcb->superblock.sector_size), (ULONG)((ce - cs) / Vcb->superblock.sector_size));
if (ce == dr->address + dr->size)
break;
}
}
if (find_next_item(Vcb, &tp, &next_tp, false, NULL))
tp = next_tp;
else
break;
} while (true);
}
lastoff = 0;
runlength = RtlFindFirstRunClear(&bmp, &index);
while (runlength != 0) {
if (index >= bmplen)
break;
if (index + runlength >= bmplen) {
runlength = bmplen - index;
if (runlength == 0)
break;
}
if (index > lastoff) {
ULONG off = lastoff;
ULONG size = index - lastoff;
// handle no csum run
do {
ULONG rl;
if (size * Vcb->superblock.sector_size > BALANCE_UNIT)
rl = BALANCE_UNIT / Vcb->superblock.sector_size;
else
rl = size;
Status = read_data(Vcb, dr->address + (off * Vcb->superblock.sector_size), rl * Vcb->superblock.sector_size, NULL, false, data,
c, NULL, NULL, 0, false, NormalPagePriority);
if (!NT_SUCCESS(Status)) {
ERR("read_data returned %08x\n", Status);
ExFreePool(csum);
ExFreePool(bmparr);
goto end;
}
Status = write_data_complete(Vcb, dr->new_address + (off * Vcb->superblock.sector_size), data, rl * Vcb->superblock.sector_size,
NULL, newchunk, false, 0, NormalPagePriority);
if (!NT_SUCCESS(Status)) {
ERR("write_data_complete returned %08x\n", Status);
ExFreePool(csum);
ExFreePool(bmparr);
goto end;
}
size -= rl;
off += rl;
} while (size > 0);
}
add_checksum_entry(Vcb, dr->new_address + (index * Vcb->superblock.sector_size), runlength, &csum[index], NULL);
add_checksum_entry(Vcb, dr->address + (index * Vcb->superblock.sector_size), runlength, NULL, NULL);
// handle csum run
do {
ULONG rl;
if (runlength * Vcb->superblock.sector_size > BALANCE_UNIT)
rl = BALANCE_UNIT / Vcb->superblock.sector_size;
else
rl = runlength;
Status = read_data(Vcb, dr->address + (index * Vcb->superblock.sector_size), rl * Vcb->superblock.sector_size, &csum[index], false, data,
c, NULL, NULL, 0, false, NormalPagePriority);
if (!NT_SUCCESS(Status)) {
ERR("read_data returned %08x\n", Status);
ExFreePool(csum);
ExFreePool(bmparr);
goto end;
}
Status = write_data_complete(Vcb, dr->new_address + (index * Vcb->superblock.sector_size), data, rl * Vcb->superblock.sector_size,
NULL, newchunk, false, 0, NormalPagePriority);
if (!NT_SUCCESS(Status)) {
ERR("write_data_complete returned %08x\n", Status);
ExFreePool(csum);
ExFreePool(bmparr);
goto end;
}
runlength -= rl;
index += rl;
} while (runlength > 0);
lastoff = index;
runlength = RtlFindNextForwardRunClear(&bmp, index, &index);
}
ExFreePool(csum);
ExFreePool(bmparr);
// handle final nocsum run
if (lastoff < dr->size / Vcb->superblock.sector_size) {
ULONG off = lastoff;
ULONG size = (ULONG)((dr->size / Vcb->superblock.sector_size) - lastoff);
do {
ULONG rl;
if (size * Vcb->superblock.sector_size > BALANCE_UNIT)
rl = BALANCE_UNIT / Vcb->superblock.sector_size;
else
rl = size;
Status = read_data(Vcb, dr->address + (off * Vcb->superblock.sector_size), rl * Vcb->superblock.sector_size, NULL, false, data,
c, NULL, NULL, 0, false, NormalPagePriority);
if (!NT_SUCCESS(Status)) {
ERR("read_data returned %08x\n", Status);
goto end;
}
Status = write_data_complete(Vcb, dr->new_address + (off * Vcb->superblock.sector_size), data, rl * Vcb->superblock.sector_size,
NULL, newchunk, false, 0, NormalPagePriority);
if (!NT_SUCCESS(Status)) {
ERR("write_data_complete returned %08x\n", Status);
goto end;
}
size -= rl;
off += rl;
} while (size > 0);
}
le = le->Flink;
}
ExFreePool(data);
data = NULL;
Status = write_metadata_items(Vcb, &metadata_items, &items, NULL, &rollback);
if (!NT_SUCCESS(Status)) {
ERR("write_metadata_items returned %08x\n", Status);
goto end;
}
le = items.Flink;
while (le != &items) {
data_reloc* dr = CONTAINING_RECORD(le, data_reloc, list_entry);
Status = add_data_reloc_extent_item(Vcb, dr);
if (!NT_SUCCESS(Status)) {
ERR("add_data_reloc_extent_item returned %08x\n", Status);
goto end;
}
le = le->Flink;
}
le = c->changed_extents.Flink;
while (le != &c->changed_extents) {
LIST_ENTRY *le2, *le3;
changed_extent* ce = CONTAINING_RECORD(le, changed_extent, list_entry);
le3 = le->Flink;
le2 = items.Flink;
while (le2 != &items) {
data_reloc* dr = CONTAINING_RECORD(le2, data_reloc, list_entry);
if (ce->address == dr->address) {
ce->address = dr->new_address;
RemoveEntryList(&ce->list_entry);
InsertTailList(&dr->newchunk->changed_extents, &ce->list_entry);
break;
}
le2 = le2->Flink;
}
le = le3;
}
Status = STATUS_SUCCESS;
Vcb->need_write = true;
end:
if (NT_SUCCESS(Status)) {
// update extents in cache inodes before we flush
le = Vcb->chunks.Flink;
while (le != &Vcb->chunks) {
chunk* c2 = CONTAINING_RECORD(le, chunk, list_entry);
if (c2->cache) {
LIST_ENTRY* le2;
ExAcquireResourceExclusiveLite(c2->cache->Header.Resource, true);
le2 = c2->cache->extents.Flink;
while (le2 != &c2->cache->extents) {
extent* ext = CONTAINING_RECORD(le2, extent, list_entry);
if (!ext->ignore) {
if (ext->extent_data.type == EXTENT_TYPE_REGULAR || ext->extent_data.type == EXTENT_TYPE_PREALLOC) {
EXTENT_DATA2* ed2 = (EXTENT_DATA2*)ext->extent_data.data;
if (ed2->size > 0 && ed2->address >= c->offset && ed2->address < c->offset + c->chunk_item->size) {
LIST_ENTRY* le3 = items.Flink;
while (le3 != &items) {
data_reloc* dr = CONTAINING_RECORD(le3, data_reloc, list_entry);
if (ed2->address == dr->address) {
ed2->address = dr->new_address;
break;
}
le3 = le3->Flink;
}
}
}
}
le2 = le2->Flink;
}
ExReleaseResourceLite(c2->cache->Header.Resource);
}
le = le->Flink;
}
Status = do_write(Vcb, NULL);
if (!NT_SUCCESS(Status))
ERR("do_write returned %08x\n", Status);
}
if (NT_SUCCESS(Status)) {
clear_rollback(&rollback);
// update open FCBs
// FIXME - speed this up(?)
le = Vcb->all_fcbs.Flink;
while (le != &Vcb->all_fcbs) {
struct _fcb* fcb = CONTAINING_RECORD(le, struct _fcb, list_entry_all);
LIST_ENTRY* le2;
ExAcquireResourceExclusiveLite(fcb->Header.Resource, true);
le2 = fcb->extents.Flink;
while (le2 != &fcb->extents) {
extent* ext = CONTAINING_RECORD(le2, extent, list_entry);
if (!ext->ignore) {
if (ext->extent_data.type == EXTENT_TYPE_REGULAR || ext->extent_data.type == EXTENT_TYPE_PREALLOC) {
EXTENT_DATA2* ed2 = (EXTENT_DATA2*)ext->extent_data.data;
if (ed2->size > 0 && ed2->address >= c->offset && ed2->address < c->offset + c->chunk_item->size) {
LIST_ENTRY* le3 = items.Flink;
while (le3 != &items) {
data_reloc* dr = CONTAINING_RECORD(le3, data_reloc, list_entry);
if (ed2->address == dr->address) {
ed2->address = dr->new_address;
break;
}
le3 = le3->Flink;
}
}
}
}
le2 = le2->Flink;
}
ExReleaseResourceLite(fcb->Header.Resource);
le = le->Flink;
}
} else
do_rollback(Vcb, &rollback);
free_trees(Vcb);
ExReleaseResourceLite(&Vcb->tree_lock);
if (data)
ExFreePool(data);
while (!IsListEmpty(&items)) {
data_reloc* dr = CONTAINING_RECORD(RemoveHeadList(&items), data_reloc, list_entry);
while (!IsListEmpty(&dr->refs)) {
data_reloc_ref* ref = CONTAINING_RECORD(RemoveHeadList(&dr->refs), data_reloc_ref, list_entry);
ExFreePool(ref);
}
ExFreePool(dr);
}
while (!IsListEmpty(&metadata_items)) {
metadata_reloc* mr = CONTAINING_RECORD(RemoveHeadList(&metadata_items), metadata_reloc, list_entry);
while (!IsListEmpty(&mr->refs)) {
metadata_reloc_ref* ref = CONTAINING_RECORD(RemoveHeadList(&mr->refs), metadata_reloc_ref, list_entry);
ExFreePool(ref);
}
if (mr->data)
ExFreePool(mr->data);
ExFreePool(mr);
}
return Status;
}
static __inline uint64_t get_chunk_dup_type(chunk* c) {
if (c->chunk_item->type & BLOCK_FLAG_RAID0)
return BLOCK_FLAG_RAID0;
else if (c->chunk_item->type & BLOCK_FLAG_RAID1)
return BLOCK_FLAG_RAID1;
else if (c->chunk_item->type & BLOCK_FLAG_DUPLICATE)
return BLOCK_FLAG_DUPLICATE;
else if (c->chunk_item->type & BLOCK_FLAG_RAID10)
return BLOCK_FLAG_RAID10;
else if (c->chunk_item->type & BLOCK_FLAG_RAID5)
return BLOCK_FLAG_RAID5;
else if (c->chunk_item->type & BLOCK_FLAG_RAID6)
return BLOCK_FLAG_RAID6;
else
return BLOCK_FLAG_SINGLE;
}
static bool should_balance_chunk(device_extension* Vcb, uint8_t sort, chunk* c) {
btrfs_balance_opts* opts;
opts = &Vcb->balance.opts[sort];
if (!(opts->flags & BTRFS_BALANCE_OPTS_ENABLED))
return false;
if (opts->flags & BTRFS_BALANCE_OPTS_PROFILES) {
uint64_t type = get_chunk_dup_type(c);
if (!(type & opts->profiles))
return false;
}
if (opts->flags & BTRFS_BALANCE_OPTS_DEVID) {
uint16_t i;
CHUNK_ITEM_STRIPE* cis = (CHUNK_ITEM_STRIPE*)&c->chunk_item[1];
bool b = false;
for (i = 0; i < c->chunk_item->num_stripes; i++) {
if (cis[i].dev_id == opts->devid) {
b = true;
break;
}
}
if (!b)
return false;
}
if (opts->flags & BTRFS_BALANCE_OPTS_DRANGE) {
uint16_t i, factor;
uint64_t physsize;
CHUNK_ITEM_STRIPE* cis = (CHUNK_ITEM_STRIPE*)&c->chunk_item[1];
bool b = false;
if (c->chunk_item->type & BLOCK_FLAG_RAID0)
factor = c->chunk_item->num_stripes;
else if (c->chunk_item->type & BLOCK_FLAG_RAID10)
factor = c->chunk_item->num_stripes / c->chunk_item->sub_stripes;
else if (c->chunk_item->type & BLOCK_FLAG_RAID5)
factor = c->chunk_item->num_stripes - 1;
else if (c->chunk_item->type & BLOCK_FLAG_RAID6)
factor = c->chunk_item->num_stripes - 2;
else // SINGLE, DUPLICATE, RAID1
factor = 1;
physsize = c->chunk_item->size / factor;
for (i = 0; i < c->chunk_item->num_stripes; i++) {
if (cis[i].offset < opts->drange_end && cis[i].offset + physsize >= opts->drange_start &&
(!(opts->flags & BTRFS_BALANCE_OPTS_DEVID) || cis[i].dev_id == opts->devid)) {
b = true;
break;
}
}
if (!b)
return false;
}
if (opts->flags & BTRFS_BALANCE_OPTS_VRANGE) {
if (c->offset + c->chunk_item->size <= opts->vrange_start || c->offset > opts->vrange_end)
return false;
}
if (opts->flags & BTRFS_BALANCE_OPTS_STRIPES) {
if (c->chunk_item->num_stripes < opts->stripes_start || c->chunk_item->num_stripes < opts->stripes_end)
return false;
}
if (opts->flags & BTRFS_BALANCE_OPTS_USAGE) {
uint64_t usage = c->used * 100 / c->chunk_item->size;
// usage == 0 should mean completely empty, not just that usage rounds to 0%
if (c->used > 0 && usage == 0)
usage = 1;
if (usage < opts->usage_start || usage > opts->usage_end)
return false;
}
if (opts->flags & BTRFS_BALANCE_OPTS_CONVERT && opts->flags & BTRFS_BALANCE_OPTS_SOFT) {
uint64_t type = get_chunk_dup_type(c);
if (type == opts->convert)
return false;
}
return true;
}
static void copy_balance_args(btrfs_balance_opts* opts, BALANCE_ARGS* args) {
if (opts->flags & BTRFS_BALANCE_OPTS_PROFILES) {
args->profiles = opts->profiles;
args->flags |= BALANCE_ARGS_FLAGS_PROFILES;
}
if (opts->flags & BTRFS_BALANCE_OPTS_USAGE) {
if (args->usage_start == 0) {
args->flags |= BALANCE_ARGS_FLAGS_USAGE_RANGE;
args->usage_start = opts->usage_start;
args->usage_end = opts->usage_end;
} else {
args->flags |= BALANCE_ARGS_FLAGS_USAGE;
args->usage = opts->usage_end;
}
}
if (opts->flags & BTRFS_BALANCE_OPTS_DEVID) {
args->devid = opts->devid;
args->flags |= BALANCE_ARGS_FLAGS_DEVID;
}
if (opts->flags & BTRFS_BALANCE_OPTS_DRANGE) {
args->drange_start = opts->drange_start;
args->drange_end = opts->drange_end;
args->flags |= BALANCE_ARGS_FLAGS_DRANGE;
}
if (opts->flags & BTRFS_BALANCE_OPTS_VRANGE) {
args->vrange_start = opts->vrange_start;
args->vrange_end = opts->vrange_end;
args->flags |= BALANCE_ARGS_FLAGS_VRANGE;
}
if (opts->flags & BTRFS_BALANCE_OPTS_CONVERT) {
args->convert = opts->convert;
args->flags |= BALANCE_ARGS_FLAGS_CONVERT;
if (opts->flags & BTRFS_BALANCE_OPTS_SOFT)
args->flags |= BALANCE_ARGS_FLAGS_SOFT;
}
if (opts->flags & BTRFS_BALANCE_OPTS_LIMIT) {
if (args->limit_start == 0) {
args->flags |= BALANCE_ARGS_FLAGS_LIMIT_RANGE;
args->limit_start = (uint32_t)opts->limit_start;
args->limit_end = (uint32_t)opts->limit_end;
} else {
args->flags |= BALANCE_ARGS_FLAGS_LIMIT;
args->limit = opts->limit_end;
}
}
if (opts->flags & BTRFS_BALANCE_OPTS_STRIPES) {
args->stripes_start = opts->stripes_start;
args->stripes_end = opts->stripes_end;
args->flags |= BALANCE_ARGS_FLAGS_STRIPES_RANGE;
}
}
static NTSTATUS add_balance_item(device_extension* Vcb) {
KEY searchkey;
traverse_ptr tp;
NTSTATUS Status;
BALANCE_ITEM* bi;
searchkey.obj_id = BALANCE_ITEM_ID;
searchkey.obj_type = TYPE_TEMP_ITEM;
searchkey.offset = 0;
ExAcquireResourceExclusiveLite(&Vcb->tree_lock, true);
Status = find_item(Vcb, Vcb->root_root, &tp, &searchkey, false, NULL);
if (!NT_SUCCESS(Status)) {
ERR("find_item returned %08x\n", Status);
goto end;
}
if (!keycmp(tp.item->key, searchkey)) {
Status = delete_tree_item(Vcb, &tp);
if (!NT_SUCCESS(Status)) {
ERR("delete_tree_item returned %08x\n", Status);
goto end;
}
}
bi = ExAllocatePoolWithTag(PagedPool, sizeof(BALANCE_ITEM), ALLOC_TAG);
if (!bi) {
ERR("out of memory\n");
Status = STATUS_INSUFFICIENT_RESOURCES;
goto end;
}
RtlZeroMemory(bi, sizeof(BALANCE_ITEM));
if (Vcb->balance.opts[BALANCE_OPTS_DATA].flags & BTRFS_BALANCE_OPTS_ENABLED) {
bi->flags |= BALANCE_FLAGS_DATA;
copy_balance_args(&Vcb->balance.opts[BALANCE_OPTS_DATA], &bi->data);
}
if (Vcb->balance.opts[BALANCE_OPTS_METADATA].flags & BTRFS_BALANCE_OPTS_ENABLED) {
bi->flags |= BALANCE_FLAGS_METADATA;
copy_balance_args(&Vcb->balance.opts[BALANCE_OPTS_METADATA], &bi->metadata);
}
if (Vcb->balance.opts[BALANCE_OPTS_SYSTEM].flags & BTRFS_BALANCE_OPTS_ENABLED) {
bi->flags |= BALANCE_FLAGS_SYSTEM;
copy_balance_args(&Vcb->balance.opts[BALANCE_OPTS_SYSTEM], &bi->system);
}
Status = insert_tree_item(Vcb, Vcb->root_root, BALANCE_ITEM_ID, TYPE_TEMP_ITEM, 0, bi, sizeof(BALANCE_ITEM), NULL, NULL);
if (!NT_SUCCESS(Status)) {
ERR("insert_tree_item returned %08x\n", Status);
ExFreePool(bi);
goto end;
}
Status = STATUS_SUCCESS;
end:
if (NT_SUCCESS(Status)) {
Status = do_write(Vcb, NULL);
if (!NT_SUCCESS(Status))
ERR("do_write returned %08x\n", Status);
}
free_trees(Vcb);
ExReleaseResourceLite(&Vcb->tree_lock);
return Status;
}
static NTSTATUS remove_balance_item(device_extension* Vcb) {
KEY searchkey;
traverse_ptr tp;
NTSTATUS Status;
searchkey.obj_id = BALANCE_ITEM_ID;
searchkey.obj_type = TYPE_TEMP_ITEM;
searchkey.offset = 0;
ExAcquireResourceExclusiveLite(&Vcb->tree_lock, true);
Status = find_item(Vcb, Vcb->root_root, &tp, &searchkey, false, NULL);
if (!NT_SUCCESS(Status)) {
ERR("find_item returned %08x\n", Status);
goto end;
}
if (!keycmp(tp.item->key, searchkey)) {
Status = delete_tree_item(Vcb, &tp);
if (!NT_SUCCESS(Status)) {
ERR("delete_tree_item returned %08x\n", Status);
goto end;
}
Status = do_write(Vcb, NULL);
if (!NT_SUCCESS(Status)) {
ERR("do_write returned %08x\n", Status);
goto end;
}
free_trees(Vcb);
}
Status = STATUS_SUCCESS;
end:
ExReleaseResourceLite(&Vcb->tree_lock);
return Status;
}
static void load_balance_args(btrfs_balance_opts* opts, BALANCE_ARGS* args) {
opts->flags = BTRFS_BALANCE_OPTS_ENABLED;
if (args->flags & BALANCE_ARGS_FLAGS_PROFILES) {
opts->flags |= BTRFS_BALANCE_OPTS_PROFILES;
opts->profiles = args->profiles;
}
if (args->flags & BALANCE_ARGS_FLAGS_USAGE) {
opts->flags |= BTRFS_BALANCE_OPTS_USAGE;
opts->usage_start = 0;
opts->usage_end = (uint8_t)args->usage;
} else if (args->flags & BALANCE_ARGS_FLAGS_USAGE_RANGE) {
opts->flags |= BTRFS_BALANCE_OPTS_USAGE;
opts->usage_start = (uint8_t)args->usage_start;
opts->usage_end = (uint8_t)args->usage_end;
}
if (args->flags & BALANCE_ARGS_FLAGS_DEVID) {
opts->flags |= BTRFS_BALANCE_OPTS_DEVID;
opts->devid = args->devid;
}
if (args->flags & BALANCE_ARGS_FLAGS_DRANGE) {
opts->flags |= BTRFS_BALANCE_OPTS_DRANGE;
opts->drange_start = args->drange_start;
opts->drange_end = args->drange_end;
}
if (args->flags & BALANCE_ARGS_FLAGS_VRANGE) {
opts->flags |= BTRFS_BALANCE_OPTS_VRANGE;
opts->vrange_start = args->vrange_start;
opts->vrange_end = args->vrange_end;
}
if (args->flags & BALANCE_ARGS_FLAGS_LIMIT) {
opts->flags |= BTRFS_BALANCE_OPTS_LIMIT;
opts->limit_start = 0;
opts->limit_end = args->limit;
} else if (args->flags & BALANCE_ARGS_FLAGS_LIMIT_RANGE) {
opts->flags |= BTRFS_BALANCE_OPTS_LIMIT;
opts->limit_start = args->limit_start;
opts->limit_end = args->limit_end;
}
if (args->flags & BALANCE_ARGS_FLAGS_STRIPES_RANGE) {
opts->flags |= BTRFS_BALANCE_OPTS_STRIPES;
opts->stripes_start = (uint16_t)args->stripes_start;
opts->stripes_end = (uint16_t)args->stripes_end;
}
if (args->flags & BALANCE_ARGS_FLAGS_CONVERT) {
opts->flags |= BTRFS_BALANCE_OPTS_CONVERT;
opts->convert = args->convert;
if (args->flags & BALANCE_ARGS_FLAGS_SOFT)
opts->flags |= BTRFS_BALANCE_OPTS_SOFT;
}
}
static NTSTATUS remove_superblocks(device* dev) {
NTSTATUS Status;
superblock* sb;
int i = 0;
sb = ExAllocatePoolWithTag(PagedPool, sizeof(superblock), ALLOC_TAG);
if (!sb) {
ERR("out of memory\n");
return STATUS_INSUFFICIENT_RESOURCES;
}
RtlZeroMemory(sb, sizeof(superblock));
while (superblock_addrs[i] > 0 && dev->devitem.num_bytes >= superblock_addrs[i] + sizeof(superblock)) {
Status = write_data_phys(dev->devobj, dev->fileobj, superblock_addrs[i], sb, sizeof(superblock));
if (!NT_SUCCESS(Status)) {
ExFreePool(sb);
return Status;
}
i++;
}
ExFreePool(sb);
return STATUS_SUCCESS;
}
static NTSTATUS finish_removing_device(_Requires_exclusive_lock_held_(_Curr_->tree_lock) device_extension* Vcb, device* dev) {
KEY searchkey;
traverse_ptr tp;
NTSTATUS Status;
LIST_ENTRY* le;
volume_device_extension* vde;
if (Vcb->need_write) {
Status = do_write(Vcb, NULL);
if (!NT_SUCCESS(Status))
ERR("do_write returned %08x\n", Status);
} else
Status = STATUS_SUCCESS;
free_trees(Vcb);
if (!NT_SUCCESS(Status))
return Status;
// remove entry in chunk tree
searchkey.obj_id = 1;
searchkey.obj_type = TYPE_DEV_ITEM;
searchkey.offset = dev->devitem.dev_id;
Status = find_item(Vcb, Vcb->chunk_root, &tp, &searchkey, false, NULL);
if (!NT_SUCCESS(Status)) {
ERR("find_item returned %08x\n", Status);
return Status;
}
if (!keycmp(searchkey, tp.item->key)) {
Status = delete_tree_item(Vcb, &tp);
if (!NT_SUCCESS(Status)) {
ERR("delete_tree_item returned %08x\n", Status);
return Status;
}
}
// remove stats entry in device tree
searchkey.obj_id = 0;
searchkey.obj_type = TYPE_DEV_STATS;
searchkey.offset = dev->devitem.dev_id;
Status = find_item(Vcb, Vcb->dev_root, &tp, &searchkey, false, NULL);
if (!NT_SUCCESS(Status)) {
ERR("find_item returned %08x\n", Status);
return Status;
}
if (!keycmp(searchkey, tp.item->key)) {
Status = delete_tree_item(Vcb, &tp);
if (!NT_SUCCESS(Status)) {
ERR("delete_tree_item returned %08x\n", Status);
return Status;
}
}
// update superblock
Vcb->superblock.num_devices--;
Vcb->superblock.total_bytes -= dev->devitem.num_bytes;
Vcb->devices_loaded--;
RemoveEntryList(&dev->list_entry);
// flush
Status = do_write(Vcb, NULL);
if (!NT_SUCCESS(Status))
ERR("do_write returned %08x\n", Status);
free_trees(Vcb);
if (!NT_SUCCESS(Status))
return Status;
if (!dev->readonly && dev->devobj) {
Status = remove_superblocks(dev);
if (!NT_SUCCESS(Status))
WARN("remove_superblocks returned %08x\n", Status);
}
// remove entry in volume list
vde = Vcb->vde;
if (dev->devobj) {
pdo_device_extension* pdode = vde->pdode;
ExAcquireResourceExclusiveLite(&pdode->child_lock, true);
le = pdode->children.Flink;
while (le != &pdode->children) {
volume_child* vc = CONTAINING_RECORD(le, volume_child, list_entry);
if (RtlCompareMemory(&dev->devitem.device_uuid, &vc->uuid, sizeof(BTRFS_UUID)) == sizeof(BTRFS_UUID)) {
PFILE_OBJECT FileObject;
PDEVICE_OBJECT mountmgr;
UNICODE_STRING mmdevpath;
pdode->children_loaded--;
if (vc->had_drive_letter) { // re-add entry to mountmgr
RtlInitUnicodeString(&mmdevpath, MOUNTMGR_DEVICE_NAME);
Status = IoGetDeviceObjectPointer(&mmdevpath, FILE_READ_ATTRIBUTES, &FileObject, &mountmgr);
if (!NT_SUCCESS(Status))
ERR("IoGetDeviceObjectPointer returned %08x\n", Status);
else {
MOUNTDEV_NAME mdn;
Status = dev_ioctl(dev->devobj, IOCTL_MOUNTDEV_QUERY_DEVICE_NAME, NULL, 0, &mdn, sizeof(MOUNTDEV_NAME), true, NULL);
if (!NT_SUCCESS(Status) && Status != STATUS_BUFFER_OVERFLOW)
ERR("IOCTL_MOUNTDEV_QUERY_DEVICE_NAME returned %08x\n", Status);
else {
MOUNTDEV_NAME* mdn2;
ULONG mdnsize = (ULONG)offsetof(MOUNTDEV_NAME, Name[0]) + mdn.NameLength;
mdn2 = ExAllocatePoolWithTag(PagedPool, mdnsize, ALLOC_TAG);
if (!mdn2)
ERR("out of memory\n");
else {
Status = dev_ioctl(dev->devobj, IOCTL_MOUNTDEV_QUERY_DEVICE_NAME, NULL, 0, mdn2, mdnsize, true, NULL);
if (!NT_SUCCESS(Status))
ERR("IOCTL_MOUNTDEV_QUERY_DEVICE_NAME returned %08x\n", Status);
else {
UNICODE_STRING name;
name.Buffer = mdn2->Name;
name.Length = name.MaximumLength = mdn2->NameLength;
Status = mountmgr_add_drive_letter(mountmgr, &name);
if (!NT_SUCCESS(Status))
WARN("mountmgr_add_drive_letter returned %08x\n", Status);
}
ExFreePool(mdn2);
}
}
ObDereferenceObject(FileObject);
}
}
ExFreePool(vc->pnp_name.Buffer);
RemoveEntryList(&vc->list_entry);
ExFreePool(vc);
ObDereferenceObject(vc->fileobj);
break;
}
le = le->Flink;
}
if (pdode->children_loaded > 0 && vde->device->Characteristics & FILE_REMOVABLE_MEDIA) {
vde->device->Characteristics &= ~FILE_REMOVABLE_MEDIA;
le = pdode->children.Flink;
while (le != &pdode->children) {
volume_child* vc = CONTAINING_RECORD(le, volume_child, list_entry);
if (vc->devobj->Characteristics & FILE_REMOVABLE_MEDIA) {
vde->device->Characteristics |= FILE_REMOVABLE_MEDIA;
break;
}
le = le->Flink;
}
}
pdode->num_children = Vcb->superblock.num_devices;
ExReleaseResourceLite(&pdode->child_lock);
// free dev
if (dev->trim && !dev->readonly && !Vcb->options.no_trim)
trim_whole_device(dev);
}
while (!IsListEmpty(&dev->space)) {
LIST_ENTRY* le2 = RemoveHeadList(&dev->space);
space* s = CONTAINING_RECORD(le2, space, list_entry);
ExFreePool(s);
}
ExFreePool(dev);
if (Vcb->trim) {
Vcb->trim = false;
le = Vcb->devices.Flink;
while (le != &Vcb->devices) {
device* dev2 = CONTAINING_RECORD(le, device, list_entry);
if (dev2->trim) {
Vcb->trim = true;
break;
}
le = le->Flink;
}
}
FsRtlNotifyVolumeEvent(Vcb->root_file, FSRTL_VOLUME_CHANGE_SIZE);
return STATUS_SUCCESS;
}
static void trim_unalloc_space(_Requires_lock_held_(_Curr_->tree_lock) device_extension* Vcb, device* dev) {
DEVICE_MANAGE_DATA_SET_ATTRIBUTES* dmdsa;
DEVICE_DATA_SET_RANGE* ranges;
ULONG datalen, i;
KEY searchkey;
traverse_ptr tp;
NTSTATUS Status;
bool b;
uint64_t lastoff = 0x100000; // don't TRIM the first megabyte, in case someone has been daft enough to install GRUB there
LIST_ENTRY* le;
dev->num_trim_entries = 0;
searchkey.obj_id = dev->devitem.dev_id;
searchkey.obj_type = TYPE_DEV_EXTENT;
searchkey.offset = 0;
Status = find_item(Vcb, Vcb->dev_root, &tp, &searchkey, false, NULL);
if (!NT_SUCCESS(Status)) {
ERR("find_item returned %08x\n", Status);
return;
}
do {
traverse_ptr next_tp;
if (tp.item->key.obj_id == dev->devitem.dev_id && tp.item->key.obj_type == TYPE_DEV_EXTENT) {
if (tp.item->size >= sizeof(DEV_EXTENT)) {
DEV_EXTENT* de = (DEV_EXTENT*)tp.item->data;
if (tp.item->key.offset > lastoff)
add_trim_entry_avoid_sb(Vcb, dev, lastoff, tp.item->key.offset - lastoff);
lastoff = tp.item->key.offset + de->length;
} else {
ERR("(%I64x,%x,%I64x) was %u bytes, expected %u\n", tp.item->key.obj_id, tp.item->key.obj_type, tp.item->key.offset, tp.item->size, sizeof(DEV_EXTENT));
return;
}
}
b = find_next_item(Vcb, &tp, &next_tp, false, NULL);
if (b) {
tp = next_tp;
if (tp.item->key.obj_id > searchkey.obj_id || (tp.item->key.obj_id == searchkey.obj_id && tp.item->key.obj_type > searchkey.obj_type))
break;
}
} while (b);
if (lastoff < dev->devitem.num_bytes)
add_trim_entry_avoid_sb(Vcb, dev, lastoff, dev->devitem.num_bytes - lastoff);
if (dev->num_trim_entries == 0)
return;
datalen = (ULONG)sector_align(sizeof(DEVICE_MANAGE_DATA_SET_ATTRIBUTES), sizeof(uint64_t)) + (dev->num_trim_entries * sizeof(DEVICE_DATA_SET_RANGE));
dmdsa = ExAllocatePoolWithTag(PagedPool, datalen, ALLOC_TAG);
if (!dmdsa) {
ERR("out of memory\n");
goto end;
}
dmdsa->Size = sizeof(DEVICE_MANAGE_DATA_SET_ATTRIBUTES);
dmdsa->Action = DeviceDsmAction_Trim;
dmdsa->Flags = DEVICE_DSM_FLAG_TRIM_NOT_FS_ALLOCATED;
dmdsa->ParameterBlockOffset = 0;
dmdsa->ParameterBlockLength = 0;
dmdsa->DataSetRangesOffset = (ULONG)sector_align(sizeof(DEVICE_MANAGE_DATA_SET_ATTRIBUTES), sizeof(uint64_t));
dmdsa->DataSetRangesLength = dev->num_trim_entries * sizeof(DEVICE_DATA_SET_RANGE);
ranges = (DEVICE_DATA_SET_RANGE*)((uint8_t*)dmdsa + dmdsa->DataSetRangesOffset);
i = 0;
le = dev->trim_list.Flink;
while (le != &dev->trim_list) {
space* s = CONTAINING_RECORD(le, space, list_entry);
ranges[i].StartingOffset = s->address;
ranges[i].LengthInBytes = s->size;
i++;
le = le->Flink;
}
Status = dev_ioctl(dev->devobj, IOCTL_STORAGE_MANAGE_DATA_SET_ATTRIBUTES, dmdsa, datalen, NULL, 0, true, NULL);
if (!NT_SUCCESS(Status))
WARN("IOCTL_STORAGE_MANAGE_DATA_SET_ATTRIBUTES returned %08x\n", Status);
ExFreePool(dmdsa);
end:
while (!IsListEmpty(&dev->trim_list)) {
space* s = CONTAINING_RECORD(RemoveHeadList(&dev->trim_list), space, list_entry);
ExFreePool(s);
}
dev->num_trim_entries = 0;
}
static NTSTATUS try_consolidation(device_extension* Vcb, uint64_t flags, chunk** newchunk) {
NTSTATUS Status;
bool changed;
LIST_ENTRY* le;
chunk* rc;
// FIXME - allow with metadata chunks?
while (true) {
rc = NULL;
ExAcquireResourceSharedLite(&Vcb->tree_lock, true);
ExAcquireResourceSharedLite(&Vcb->chunk_lock, true);
// choose the least-used chunk we haven't looked at yet
le = Vcb->chunks.Flink;
while (le != &Vcb->chunks) {
chunk* c = CONTAINING_RECORD(le, chunk, list_entry);
// FIXME - skip full-size chunks over e.g. 90% full?
if (c->chunk_item->type & BLOCK_FLAG_DATA && !c->readonly && c->balance_num != Vcb->balance.balance_num && (!rc || c->used < rc->used))
rc = c;
le = le->Flink;
}
ExReleaseResourceLite(&Vcb->chunk_lock);
if (!rc) {
ExReleaseResourceLite(&Vcb->tree_lock);
break;
}
if (rc->list_entry_balance.Flink) {
RemoveEntryList(&rc->list_entry_balance);
Vcb->balance.chunks_left--;
}
rc->list_entry_balance.Flink = (LIST_ENTRY*)1; // so it doesn't get dropped
rc->reloc = true;
ExReleaseResourceLite(&Vcb->tree_lock);
do {
changed = false;
Status = balance_data_chunk(Vcb, rc, &changed);
if (!NT_SUCCESS(Status)) {
ERR("balance_data_chunk returned %08x\n", Status);
Vcb->balance.status = Status;
rc->list_entry_balance.Flink = NULL;
rc->reloc = false;
return Status;
}
KeWaitForSingleObject(&Vcb->balance.event, Executive, KernelMode, false, NULL);
if (Vcb->readonly)
Vcb->balance.stopping = true;
if (Vcb->balance.stopping)
return STATUS_SUCCESS;
} while (changed);
rc->list_entry_balance.Flink = NULL;
rc->changed = true;
rc->space_changed = true;
rc->balance_num = Vcb->balance.balance_num;
Status = do_write(Vcb, NULL);
if (!NT_SUCCESS(Status)) {
ERR("do_write returned %08x\n", Status);
return Status;
}
free_trees(Vcb);
}
ExAcquireResourceExclusiveLite(&Vcb->chunk_lock, true);
Status = alloc_chunk(Vcb, flags, &rc, true);
ExReleaseResourceLite(&Vcb->chunk_lock);
if (NT_SUCCESS(Status)) {
*newchunk = rc;
return Status;
} else {
ERR("alloc_chunk returned %08x\n", Status);
return Status;
}
}
static NTSTATUS regenerate_space_list(device_extension* Vcb, device* dev) {
LIST_ENTRY* le;
while (!IsListEmpty(&dev->space)) {
space* s = CONTAINING_RECORD(RemoveHeadList(&dev->space), space, list_entry);
ExFreePool(s);
}
// The Linux driver doesn't like to allocate chunks within the first megabyte of a device.
space_list_add2(&dev->space, NULL, 0x100000, dev->devitem.num_bytes - 0x100000, NULL, NULL);
le = Vcb->chunks.Flink;
while (le != &Vcb->chunks) {
uint16_t n;
chunk* c = CONTAINING_RECORD(le, chunk, list_entry);
CHUNK_ITEM_STRIPE* cis = (CHUNK_ITEM_STRIPE*)&c->chunk_item[1];
for (n = 0; n < c->chunk_item->num_stripes; n++) {
uint64_t stripe_size = 0;
if (cis[n].dev_id == dev->devitem.dev_id) {
if (stripe_size == 0) {
uint16_t factor;
if (c->chunk_item->type & BLOCK_FLAG_RAID0)
factor = c->chunk_item->num_stripes;
else if (c->chunk_item->type & BLOCK_FLAG_RAID10)
factor = c->chunk_item->num_stripes / c->chunk_item->sub_stripes;
else if (c->chunk_item->type & BLOCK_FLAG_RAID5)
factor = c->chunk_item->num_stripes - 1;
else if (c->chunk_item->type & BLOCK_FLAG_RAID6)
factor = c->chunk_item->num_stripes - 2;
else // SINGLE, DUP, RAID1
factor = 1;
stripe_size = c->chunk_item->size / factor;
}
space_list_subtract2(&dev->space, NULL, cis[n].offset, stripe_size, NULL, NULL);
}
}
le = le->Flink;
}
return STATUS_SUCCESS;
}
_Function_class_(KSTART_ROUTINE)
void __stdcall balance_thread(void* context) {
device_extension* Vcb = (device_extension*)context;
LIST_ENTRY chunks;
LIST_ENTRY* le;
uint64_t num_chunks[3], okay_metadata_chunks = 0, okay_data_chunks = 0, okay_system_chunks = 0;
uint64_t old_data_flags = 0, old_metadata_flags = 0, old_system_flags = 0;
NTSTATUS Status;
Vcb->balance.balance_num++;
Vcb->balance.stopping = false;
KeInitializeEvent(&Vcb->balance.finished, NotificationEvent, false);
if (Vcb->balance.opts[BALANCE_OPTS_DATA].flags & BTRFS_BALANCE_OPTS_ENABLED && Vcb->balance.opts[BALANCE_OPTS_DATA].flags & BTRFS_BALANCE_OPTS_CONVERT) {
old_data_flags = Vcb->data_flags;
Vcb->data_flags = BLOCK_FLAG_DATA | (Vcb->balance.opts[BALANCE_OPTS_DATA].convert == BLOCK_FLAG_SINGLE ? 0 : Vcb->balance.opts[BALANCE_OPTS_DATA].convert);
FsRtlNotifyVolumeEvent(Vcb->root_file, FSRTL_VOLUME_CHANGE_SIZE);
}
if (Vcb->balance.opts[BALANCE_OPTS_METADATA].flags & BTRFS_BALANCE_OPTS_ENABLED && Vcb->balance.opts[BALANCE_OPTS_METADATA].flags & BTRFS_BALANCE_OPTS_CONVERT) {
old_metadata_flags = Vcb->metadata_flags;
Vcb->metadata_flags = BLOCK_FLAG_METADATA | (Vcb->balance.opts[BALANCE_OPTS_METADATA].convert == BLOCK_FLAG_SINGLE ? 0 : Vcb->balance.opts[BALANCE_OPTS_METADATA].convert);
}
if (Vcb->balance.opts[BALANCE_OPTS_SYSTEM].flags & BTRFS_BALANCE_OPTS_ENABLED && Vcb->balance.opts[BALANCE_OPTS_SYSTEM].flags & BTRFS_BALANCE_OPTS_CONVERT) {
old_system_flags = Vcb->system_flags;
Vcb->system_flags = BLOCK_FLAG_SYSTEM | (Vcb->balance.opts[BALANCE_OPTS_SYSTEM].convert == BLOCK_FLAG_SINGLE ? 0 : Vcb->balance.opts[BALANCE_OPTS_SYSTEM].convert);
}
if (Vcb->superblock.incompat_flags & BTRFS_INCOMPAT_FLAGS_MIXED_GROUPS) {
if (Vcb->balance.opts[BALANCE_OPTS_DATA].flags & BTRFS_BALANCE_OPTS_ENABLED)
RtlCopyMemory(&Vcb->balance.opts[BALANCE_OPTS_METADATA], &Vcb->balance.opts[BALANCE_OPTS_DATA], sizeof(btrfs_balance_opts));
else if (Vcb->balance.opts[BALANCE_OPTS_METADATA].flags & BTRFS_BALANCE_OPTS_ENABLED)
RtlCopyMemory(&Vcb->balance.opts[BALANCE_OPTS_DATA], &Vcb->balance.opts[BALANCE_OPTS_METADATA], sizeof(btrfs_balance_opts));
}
num_chunks[0] = num_chunks[1] = num_chunks[2] = 0;
Vcb->balance.total_chunks = Vcb->balance.chunks_left = 0;
InitializeListHead(&chunks);
// FIXME - what are we supposed to do with limit_start?
if (!Vcb->readonly) {
if (!Vcb->balance.removing && !Vcb->balance.shrinking) {
Status = add_balance_item(Vcb);
if (!NT_SUCCESS(Status)) {
ERR("add_balance_item returned %08x\n", Status);
Vcb->balance.status = Status;
goto end;
}
} else {
if (Vcb->need_write) {
Status = do_write(Vcb, NULL);
free_trees(Vcb);
if (!NT_SUCCESS(Status)) {
ERR("do_write returned %08x\n", Status);
Vcb->balance.status = Status;
goto end;
}
}
}
}
KeWaitForSingleObject(&Vcb->balance.event, Executive, KernelMode, false, NULL);
if (Vcb->balance.stopping)
goto end;
ExAcquireResourceSharedLite(&Vcb->chunk_lock, true);
le = Vcb->chunks.Flink;
while (le != &Vcb->chunks) {
chunk* c = CONTAINING_RECORD(le, chunk, list_entry);
uint8_t sort;
acquire_chunk_lock(c, Vcb);
if (c->chunk_item->type & BLOCK_FLAG_DATA)
sort = BALANCE_OPTS_DATA;
else if (c->chunk_item->type & BLOCK_FLAG_METADATA)
sort = BALANCE_OPTS_METADATA;
else if (c->chunk_item->type & BLOCK_FLAG_SYSTEM)
sort = BALANCE_OPTS_SYSTEM;
else {
ERR("unexpected chunk type %I64x\n", c->chunk_item->type);
release_chunk_lock(c, Vcb);
break;
}
if ((!(Vcb->balance.opts[sort].flags & BTRFS_BALANCE_OPTS_LIMIT) || num_chunks[sort] < Vcb->balance.opts[sort].limit_end) &&
should_balance_chunk(Vcb, sort, c)) {
InsertTailList(&chunks, &c->list_entry_balance);
num_chunks[sort]++;
Vcb->balance.total_chunks++;
Vcb->balance.chunks_left++;
} else if (sort == BALANCE_OPTS_METADATA)
okay_metadata_chunks++;
else if (sort == BALANCE_OPTS_DATA)
okay_data_chunks++;
else if (sort == BALANCE_OPTS_SYSTEM)
okay_system_chunks++;
if (!c->cache_loaded) {
Status = load_cache_chunk(Vcb, c, NULL);
if (!NT_SUCCESS(Status)) {
ERR("load_cache_chunk returned %08x\n", Status);
Vcb->balance.status = Status;
release_chunk_lock(c, Vcb);
ExReleaseResourceLite(&Vcb->chunk_lock);
goto end;
}
}
release_chunk_lock(c, Vcb);
le = le->Flink;
}
ExReleaseResourceLite(&Vcb->chunk_lock);
// If we're doing a full balance, try and allocate a new chunk now, before we mess things up
if (okay_metadata_chunks == 0 || okay_data_chunks == 0 || okay_system_chunks == 0) {
bool consolidated = false;
chunk* c;
if (okay_metadata_chunks == 0) {
ExAcquireResourceExclusiveLite(&Vcb->chunk_lock, true);
Status = alloc_chunk(Vcb, Vcb->metadata_flags, &c, true);
if (NT_SUCCESS(Status))
c->balance_num = Vcb->balance.balance_num;
else if (Status != STATUS_DISK_FULL || consolidated) {
ERR("alloc_chunk returned %08x\n", Status);
ExReleaseResourceLite(&Vcb->chunk_lock);
Vcb->balance.status = Status;
goto end;
}
ExReleaseResourceLite(&Vcb->chunk_lock);
if (Status == STATUS_DISK_FULL) {
Status = try_consolidation(Vcb, Vcb->metadata_flags, &c);
if (!NT_SUCCESS(Status)) {
ERR("try_consolidation returned %08x\n", Status);
Vcb->balance.status = Status;
goto end;
} else
c->balance_num = Vcb->balance.balance_num;
consolidated = true;
if (Vcb->balance.stopping)
goto end;
}
}
if (okay_data_chunks == 0) {
ExAcquireResourceExclusiveLite(&Vcb->chunk_lock, true);
Status = alloc_chunk(Vcb, Vcb->data_flags, &c, true);
if (NT_SUCCESS(Status))
c->balance_num = Vcb->balance.balance_num;
else if (Status != STATUS_DISK_FULL || consolidated) {
ERR("alloc_chunk returned %08x\n", Status);
ExReleaseResourceLite(&Vcb->chunk_lock);
Vcb->balance.status = Status;
goto end;
}
ExReleaseResourceLite(&Vcb->chunk_lock);
if (Status == STATUS_DISK_FULL) {
Status = try_consolidation(Vcb, Vcb->data_flags, &c);
if (!NT_SUCCESS(Status)) {
ERR("try_consolidation returned %08x\n", Status);
Vcb->balance.status = Status;
goto end;
} else
c->balance_num = Vcb->balance.balance_num;
consolidated = true;
if (Vcb->balance.stopping)
goto end;
}
}
if (okay_system_chunks == 0) {
ExAcquireResourceExclusiveLite(&Vcb->chunk_lock, true);
Status = alloc_chunk(Vcb, Vcb->system_flags, &c, true);
if (NT_SUCCESS(Status))
c->balance_num = Vcb->balance.balance_num;
else if (Status != STATUS_DISK_FULL || consolidated) {
ERR("alloc_chunk returned %08x\n", Status);
ExReleaseResourceLite(&Vcb->chunk_lock);
Vcb->balance.status = Status;
goto end;
}
ExReleaseResourceLite(&Vcb->chunk_lock);
if (Status == STATUS_DISK_FULL) {
Status = try_consolidation(Vcb, Vcb->system_flags, &c);
if (!NT_SUCCESS(Status)) {
ERR("try_consolidation returned %08x\n", Status);
Vcb->balance.status = Status;
goto end;
} else
c->balance_num = Vcb->balance.balance_num;
consolidated = true;
if (Vcb->balance.stopping)
goto end;
}
}
}
ExAcquireResourceSharedLite(&Vcb->chunk_lock, true);
le = chunks.Flink;
while (le != &chunks) {
chunk* c = CONTAINING_RECORD(le, chunk, list_entry_balance);
c->reloc = true;
le = le->Flink;
}
ExReleaseResourceLite(&Vcb->chunk_lock);
// do data chunks before metadata
le = chunks.Flink;
while (le != &chunks) {
chunk* c = CONTAINING_RECORD(le, chunk, list_entry_balance);
LIST_ENTRY* le2 = le->Flink;
if (c->chunk_item->type & BLOCK_FLAG_DATA) {
bool changed;
do {
changed = false;
Status = balance_data_chunk(Vcb, c, &changed);
if (!NT_SUCCESS(Status)) {
ERR("balance_data_chunk returned %08x\n", Status);
Vcb->balance.status = Status;
goto end;
}
KeWaitForSingleObject(&Vcb->balance.event, Executive, KernelMode, false, NULL);
if (Vcb->readonly)
Vcb->balance.stopping = true;
if (Vcb->balance.stopping)
break;
} while (changed);
c->changed = true;
c->space_changed = true;
}
if (Vcb->balance.stopping)
goto end;
if (c->chunk_item->type & BLOCK_FLAG_DATA &&
(!(Vcb->balance.opts[BALANCE_OPTS_METADATA].flags & BTRFS_BALANCE_OPTS_ENABLED) || !(c->chunk_item->type & BLOCK_FLAG_METADATA))) {
RemoveEntryList(&c->list_entry_balance);
c->list_entry_balance.Flink = NULL;
Vcb->balance.chunks_left--;
}
le = le2;
}
// do metadata chunks
while (!IsListEmpty(&chunks)) {
chunk* c;
bool changed;
le = RemoveHeadList(&chunks);
c = CONTAINING_RECORD(le, chunk, list_entry_balance);
if (c->chunk_item->type & BLOCK_FLAG_METADATA || c->chunk_item->type & BLOCK_FLAG_SYSTEM) {
do {
Status = balance_metadata_chunk(Vcb, c, &changed);
if (!NT_SUCCESS(Status)) {
ERR("balance_metadata_chunk returned %08x\n", Status);
Vcb->balance.status = Status;
goto end;
}
KeWaitForSingleObject(&Vcb->balance.event, Executive, KernelMode, false, NULL);
if (Vcb->readonly)
Vcb->balance.stopping = true;
if (Vcb->balance.stopping)
break;
} while (changed);
c->changed = true;
c->space_changed = true;
}
if (Vcb->balance.stopping)
break;
c->list_entry_balance.Flink = NULL;
Vcb->balance.chunks_left--;
}
end:
if (!Vcb->readonly) {
if (Vcb->balance.stopping || !NT_SUCCESS(Vcb->balance.status)) {
le = chunks.Flink;
while (le != &chunks) {
chunk* c = CONTAINING_RECORD(le, chunk, list_entry_balance);
c->reloc = false;
le = le->Flink;
c->list_entry_balance.Flink = NULL;
}
if (old_data_flags != 0)
Vcb->data_flags = old_data_flags;
if (old_metadata_flags != 0)
Vcb->metadata_flags = old_metadata_flags;
if (old_system_flags != 0)
Vcb->system_flags = old_system_flags;
}
if (Vcb->balance.removing) {
device* dev = NULL;
ExAcquireResourceExclusiveLite(&Vcb->tree_lock, true);
le = Vcb->devices.Flink;
while (le != &Vcb->devices) {
device* dev2 = CONTAINING_RECORD(le, device, list_entry);
if (dev2->devitem.dev_id == Vcb->balance.opts[0].devid) {
dev = dev2;
break;
}
le = le->Flink;
}
if (dev) {
if (Vcb->balance.chunks_left == 0) {
Status = finish_removing_device(Vcb, dev);
if (!NT_SUCCESS(Status)) {
ERR("finish_removing_device returned %08x\n", Status);
dev->reloc = false;
}
} else
dev->reloc = false;
}
ExReleaseResourceLite(&Vcb->tree_lock);
} else if (Vcb->balance.shrinking) {
device* dev = NULL;
ExAcquireResourceExclusiveLite(&Vcb->tree_lock, true);
le = Vcb->devices.Flink;
while (le != &Vcb->devices) {
device* dev2 = CONTAINING_RECORD(le, device, list_entry);
if (dev2->devitem.dev_id == Vcb->balance.opts[0].devid) {
dev = dev2;
break;
}
le = le->Flink;
}
if (!dev) {
ERR("could not find device %I64x\n", Vcb->balance.opts[0].devid);
Vcb->balance.status = STATUS_INTERNAL_ERROR;
}
if (Vcb->balance.stopping || !NT_SUCCESS(Vcb->balance.status)) {
if (dev) {
Status = regenerate_space_list(Vcb, dev);
if (!NT_SUCCESS(Status))
WARN("regenerate_space_list returned %08x\n", Status);
}
} else {
uint64_t old_size;
old_size = dev->devitem.num_bytes;
dev->devitem.num_bytes = Vcb->balance.opts[0].drange_start;
Status = update_dev_item(Vcb, dev, NULL);
if (!NT_SUCCESS(Status)) {
ERR("update_dev_item returned %08x\n", Status);
dev->devitem.num_bytes = old_size;
Vcb->balance.status = Status;
Status = regenerate_space_list(Vcb, dev);
if (!NT_SUCCESS(Status))
WARN("regenerate_space_list returned %08x\n", Status);
} else {
Vcb->superblock.total_bytes -= old_size - dev->devitem.num_bytes;
Status = do_write(Vcb, NULL);
if (!NT_SUCCESS(Status))
ERR("do_write returned %08x\n", Status);
free_trees(Vcb);
}
}
ExReleaseResourceLite(&Vcb->tree_lock);
if (!Vcb->balance.stopping && NT_SUCCESS(Vcb->balance.status))
FsRtlNotifyVolumeEvent(Vcb->root_file, FSRTL_VOLUME_CHANGE_SIZE);
} else {
Status = remove_balance_item(Vcb);
if (!NT_SUCCESS(Status)) {
ERR("remove_balance_item returned %08x\n", Status);
goto end;
}
}
if (Vcb->trim && !Vcb->options.no_trim) {
ExAcquireResourceExclusiveLite(&Vcb->tree_lock, true);
le = Vcb->devices.Flink;
while (le != &Vcb->devices) {
device* dev2 = CONTAINING_RECORD(le, device, list_entry);
if (dev2->devobj && !dev2->readonly && dev2->trim)
trim_unalloc_space(Vcb, dev2);
le = le->Flink;
}
ExReleaseResourceLite(&Vcb->tree_lock);
}
}
ZwClose(Vcb->balance.thread);
Vcb->balance.thread = NULL;
KeSetEvent(&Vcb->balance.finished, 0, false);
}
NTSTATUS start_balance(device_extension* Vcb, void* data, ULONG length, KPROCESSOR_MODE processor_mode) {
NTSTATUS Status;
btrfs_start_balance* bsb = (btrfs_start_balance*)data;
OBJECT_ATTRIBUTES oa;
uint8_t i;
if (length < sizeof(btrfs_start_balance) || !data)
return STATUS_INVALID_PARAMETER;
if (!SeSinglePrivilegeCheck(RtlConvertLongToLuid(SE_MANAGE_VOLUME_PRIVILEGE), processor_mode))
return STATUS_PRIVILEGE_NOT_HELD;
if (Vcb->locked) {
WARN("cannot start balance while locked\n");
return STATUS_DEVICE_NOT_READY;
}
if (Vcb->scrub.thread) {
WARN("cannot start balance while scrub running\n");
return STATUS_DEVICE_NOT_READY;
}
if (Vcb->balance.thread) {
WARN("balance already running\n");
return STATUS_DEVICE_NOT_READY;
}
if (Vcb->readonly)
return STATUS_MEDIA_WRITE_PROTECTED;
if (!(bsb->opts[BALANCE_OPTS_DATA].flags & BTRFS_BALANCE_OPTS_ENABLED) &&
!(bsb->opts[BALANCE_OPTS_METADATA].flags & BTRFS_BALANCE_OPTS_ENABLED) &&
!(bsb->opts[BALANCE_OPTS_SYSTEM].flags & BTRFS_BALANCE_OPTS_ENABLED))
return STATUS_SUCCESS;
for (i = 0; i < 3; i++) {
if (bsb->opts[i].flags & BTRFS_BALANCE_OPTS_ENABLED) {
if (bsb->opts[i].flags & BTRFS_BALANCE_OPTS_PROFILES) {
bsb->opts[i].profiles &= BLOCK_FLAG_RAID0 | BLOCK_FLAG_RAID1 | BLOCK_FLAG_DUPLICATE | BLOCK_FLAG_RAID10 |
BLOCK_FLAG_RAID5 | BLOCK_FLAG_RAID6 | BLOCK_FLAG_SINGLE;
if (bsb->opts[i].profiles == 0)
return STATUS_INVALID_PARAMETER;
}
if (bsb->opts[i].flags & BTRFS_BALANCE_OPTS_DEVID) {
if (bsb->opts[i].devid == 0)
return STATUS_INVALID_PARAMETER;
}
if (bsb->opts[i].flags & BTRFS_BALANCE_OPTS_DRANGE) {
if (bsb->opts[i].drange_start > bsb->opts[i].drange_end)
return STATUS_INVALID_PARAMETER;
}
if (bsb->opts[i].flags & BTRFS_BALANCE_OPTS_VRANGE) {
if (bsb->opts[i].vrange_start > bsb->opts[i].vrange_end)
return STATUS_INVALID_PARAMETER;
}
if (bsb->opts[i].flags & BTRFS_BALANCE_OPTS_LIMIT) {
bsb->opts[i].limit_start = max(1, bsb->opts[i].limit_start);
bsb->opts[i].limit_end = max(1, bsb->opts[i].limit_end);
if (bsb->opts[i].limit_start > bsb->opts[i].limit_end)
return STATUS_INVALID_PARAMETER;
}
if (bsb->opts[i].flags & BTRFS_BALANCE_OPTS_STRIPES) {
bsb->opts[i].stripes_start = max(1, bsb->opts[i].stripes_start);
bsb->opts[i].stripes_end = max(1, bsb->opts[i].stripes_end);
if (bsb->opts[i].stripes_start > bsb->opts[i].stripes_end)
return STATUS_INVALID_PARAMETER;
}
if (bsb->opts[i].flags & BTRFS_BALANCE_OPTS_USAGE) {
bsb->opts[i].usage_start = min(100, bsb->opts[i].stripes_start);
bsb->opts[i].usage_end = min(100, bsb->opts[i].stripes_end);
if (bsb->opts[i].stripes_start > bsb->opts[i].stripes_end)
return STATUS_INVALID_PARAMETER;
}
if (bsb->opts[i].flags & BTRFS_BALANCE_OPTS_CONVERT) {
if (bsb->opts[i].convert != BLOCK_FLAG_RAID0 && bsb->opts[i].convert != BLOCK_FLAG_RAID1 &&
bsb->opts[i].convert != BLOCK_FLAG_DUPLICATE && bsb->opts[i].convert != BLOCK_FLAG_RAID10 &&
bsb->opts[i].convert != BLOCK_FLAG_RAID5 && bsb->opts[i].convert != BLOCK_FLAG_RAID6 &&
bsb->opts[i].convert != BLOCK_FLAG_SINGLE)
return STATUS_INVALID_PARAMETER;
}
}
}
RtlCopyMemory(&Vcb->balance.opts[BALANCE_OPTS_DATA], &bsb->opts[BALANCE_OPTS_DATA], sizeof(btrfs_balance_opts));
RtlCopyMemory(&Vcb->balance.opts[BALANCE_OPTS_METADATA], &bsb->opts[BALANCE_OPTS_METADATA], sizeof(btrfs_balance_opts));
RtlCopyMemory(&Vcb->balance.opts[BALANCE_OPTS_SYSTEM], &bsb->opts[BALANCE_OPTS_SYSTEM], sizeof(btrfs_balance_opts));
Vcb->balance.paused = false;
Vcb->balance.removing = false;
Vcb->balance.shrinking = false;
Vcb->balance.status = STATUS_SUCCESS;
KeInitializeEvent(&Vcb->balance.event, NotificationEvent, !Vcb->balance.paused);
InitializeObjectAttributes(&oa, NULL, OBJ_KERNEL_HANDLE, NULL, NULL);
Status = PsCreateSystemThread(&Vcb->balance.thread, 0, &oa, NULL, NULL, balance_thread, Vcb);
if (!NT_SUCCESS(Status)) {
ERR("PsCreateSystemThread returned %08x\n", Status);
return Status;
}
return STATUS_SUCCESS;
}
NTSTATUS look_for_balance_item(_Requires_lock_held_(_Curr_->tree_lock) device_extension* Vcb) {
KEY searchkey;
traverse_ptr tp;
NTSTATUS Status;
BALANCE_ITEM* bi;
OBJECT_ATTRIBUTES oa;
int i;
searchkey.obj_id = BALANCE_ITEM_ID;
searchkey.obj_type = TYPE_TEMP_ITEM;
searchkey.offset = 0;
Status = find_item(Vcb, Vcb->root_root, &tp, &searchkey, false, NULL);
if (!NT_SUCCESS(Status)) {
ERR("find_item returned %08x\n", Status);
return Status;
}
if (keycmp(tp.item->key, searchkey)) {
TRACE("no balance item found\n");
return STATUS_NOT_FOUND;
}
if (tp.item->size < sizeof(BALANCE_ITEM)) {
WARN("(%I64x,%x,%I64x) was %u bytes, expected %u\n", tp.item->key.obj_id, tp.item->key.obj_type, tp.item->key.offset,
tp.item->size, sizeof(BALANCE_ITEM));
return STATUS_INTERNAL_ERROR;
}
bi = (BALANCE_ITEM*)tp.item->data;
if (bi->flags & BALANCE_FLAGS_DATA)
load_balance_args(&Vcb->balance.opts[BALANCE_OPTS_DATA], &bi->data);
if (bi->flags & BALANCE_FLAGS_METADATA)
load_balance_args(&Vcb->balance.opts[BALANCE_OPTS_METADATA], &bi->metadata);
if (bi->flags & BALANCE_FLAGS_SYSTEM)
load_balance_args(&Vcb->balance.opts[BALANCE_OPTS_SYSTEM], &bi->system);
// do the heuristics that Linux driver does
for (i = 0; i < 3; i++) {
if (Vcb->balance.opts[i].flags & BTRFS_BALANCE_OPTS_ENABLED) {
// if converting, don't redo chunks already done
if (Vcb->balance.opts[i].flags & BTRFS_BALANCE_OPTS_CONVERT)
Vcb->balance.opts[i].flags |= BTRFS_BALANCE_OPTS_SOFT;
// don't balance chunks more than 90% filled - presumably these
// have already been done
if (!(Vcb->balance.opts[i].flags & BTRFS_BALANCE_OPTS_USAGE) &&
!(Vcb->balance.opts[i].flags & BTRFS_BALANCE_OPTS_CONVERT)
) {
Vcb->balance.opts[i].flags |= BTRFS_BALANCE_OPTS_USAGE;
Vcb->balance.opts[i].usage_start = 0;
Vcb->balance.opts[i].usage_end = 90;
}
}
}
if (Vcb->readonly || Vcb->options.skip_balance)
Vcb->balance.paused = true;
else
Vcb->balance.paused = false;
Vcb->balance.removing = false;
Vcb->balance.shrinking = false;
Vcb->balance.status = STATUS_SUCCESS;
KeInitializeEvent(&Vcb->balance.event, NotificationEvent, !Vcb->balance.paused);
InitializeObjectAttributes(&oa, NULL, OBJ_KERNEL_HANDLE, NULL, NULL);
Status = PsCreateSystemThread(&Vcb->balance.thread, 0, &oa, NULL, NULL, balance_thread, Vcb);
if (!NT_SUCCESS(Status)) {
ERR("PsCreateSystemThread returned %08x\n", Status);
return Status;
}
return STATUS_SUCCESS;
}
NTSTATUS query_balance(device_extension* Vcb, void* data, ULONG length) {
btrfs_query_balance* bqb = (btrfs_query_balance*)data;
if (length < sizeof(btrfs_query_balance) || !data)
return STATUS_INVALID_PARAMETER;
if (!Vcb->balance.thread) {
bqb->status = BTRFS_BALANCE_STOPPED;
if (!NT_SUCCESS(Vcb->balance.status)) {
bqb->status |= BTRFS_BALANCE_ERROR;
bqb->error = Vcb->balance.status;
}
return STATUS_SUCCESS;
}
bqb->status = Vcb->balance.paused ? BTRFS_BALANCE_PAUSED : BTRFS_BALANCE_RUNNING;
if (Vcb->balance.removing)
bqb->status |= BTRFS_BALANCE_REMOVAL;
if (Vcb->balance.shrinking)
bqb->status |= BTRFS_BALANCE_SHRINKING;
if (!NT_SUCCESS(Vcb->balance.status))
bqb->status |= BTRFS_BALANCE_ERROR;
bqb->chunks_left = Vcb->balance.chunks_left;
bqb->total_chunks = Vcb->balance.total_chunks;
bqb->error = Vcb->balance.status;
RtlCopyMemory(&bqb->data_opts, &Vcb->balance.opts[BALANCE_OPTS_DATA], sizeof(btrfs_balance_opts));
RtlCopyMemory(&bqb->metadata_opts, &Vcb->balance.opts[BALANCE_OPTS_METADATA], sizeof(btrfs_balance_opts));
RtlCopyMemory(&bqb->system_opts, &Vcb->balance.opts[BALANCE_OPTS_SYSTEM], sizeof(btrfs_balance_opts));
return STATUS_SUCCESS;
}
NTSTATUS pause_balance(device_extension* Vcb, KPROCESSOR_MODE processor_mode) {
if (!SeSinglePrivilegeCheck(RtlConvertLongToLuid(SE_MANAGE_VOLUME_PRIVILEGE), processor_mode))
return STATUS_PRIVILEGE_NOT_HELD;
if (!Vcb->balance.thread)
return STATUS_DEVICE_NOT_READY;
if (Vcb->balance.paused)
return STATUS_DEVICE_NOT_READY;
Vcb->balance.paused = true;
KeClearEvent(&Vcb->balance.event);
return STATUS_SUCCESS;
}
NTSTATUS resume_balance(device_extension* Vcb, KPROCESSOR_MODE processor_mode) {
if (!SeSinglePrivilegeCheck(RtlConvertLongToLuid(SE_MANAGE_VOLUME_PRIVILEGE), processor_mode))
return STATUS_PRIVILEGE_NOT_HELD;
if (!Vcb->balance.thread)
return STATUS_DEVICE_NOT_READY;
if (!Vcb->balance.paused)
return STATUS_DEVICE_NOT_READY;
if (Vcb->readonly)
return STATUS_MEDIA_WRITE_PROTECTED;
Vcb->balance.paused = false;
KeSetEvent(&Vcb->balance.event, 0, false);
return STATUS_SUCCESS;
}
NTSTATUS stop_balance(device_extension* Vcb, KPROCESSOR_MODE processor_mode) {
if (!SeSinglePrivilegeCheck(RtlConvertLongToLuid(SE_MANAGE_VOLUME_PRIVILEGE), processor_mode))
return STATUS_PRIVILEGE_NOT_HELD;
if (!Vcb->balance.thread)
return STATUS_DEVICE_NOT_READY;
Vcb->balance.paused = false;
Vcb->balance.stopping = true;
Vcb->balance.status = STATUS_SUCCESS;
KeSetEvent(&Vcb->balance.event, 0, false);
return STATUS_SUCCESS;
}
NTSTATUS remove_device(device_extension* Vcb, void* data, ULONG length, KPROCESSOR_MODE processor_mode) {
uint64_t devid;
LIST_ENTRY* le;
device* dev = NULL;
NTSTATUS Status;
int i;
uint64_t num_rw_devices;
OBJECT_ATTRIBUTES oa;
TRACE("(%p, %p, %x)\n", Vcb, data, length);
if (!SeSinglePrivilegeCheck(RtlConvertLongToLuid(SE_MANAGE_VOLUME_PRIVILEGE), processor_mode))
return STATUS_PRIVILEGE_NOT_HELD;
if (length < sizeof(uint64_t))
return STATUS_INVALID_PARAMETER;
devid = *(uint64_t*)data;
ExAcquireResourceSharedLite(&Vcb->tree_lock, true);
if (Vcb->readonly) {
ExReleaseResourceLite(&Vcb->tree_lock);
return STATUS_MEDIA_WRITE_PROTECTED;
}
num_rw_devices = 0;
le = Vcb->devices.Flink;
while (le != &Vcb->devices) {
device* dev2 = CONTAINING_RECORD(le, device, list_entry);
if (dev2->devitem.dev_id == devid)
dev = dev2;
if (!dev2->readonly)
num_rw_devices++;
le = le->Flink;
}
if (!dev) {
ExReleaseResourceLite(&Vcb->tree_lock);
WARN("device %I64x not found\n", devid);
return STATUS_NOT_FOUND;
}
if (!dev->readonly) {
if (num_rw_devices == 1) {
ExReleaseResourceLite(&Vcb->tree_lock);
WARN("not removing last non-readonly device\n");
return STATUS_INVALID_PARAMETER;
}
if (num_rw_devices == 4 &&
((Vcb->data_flags & BLOCK_FLAG_RAID10 || Vcb->metadata_flags & BLOCK_FLAG_RAID10 || Vcb->system_flags & BLOCK_FLAG_RAID10) ||
(Vcb->data_flags & BLOCK_FLAG_RAID6 || Vcb->metadata_flags & BLOCK_FLAG_RAID6 || Vcb->system_flags & BLOCK_FLAG_RAID6))
) {
ExReleaseResourceLite(&Vcb->tree_lock);
ERR("would not be enough devices to satisfy RAID requirement (RAID6/10)\n");
return STATUS_CANNOT_DELETE;
}
if (num_rw_devices == 3 && (Vcb->data_flags & BLOCK_FLAG_RAID5 || Vcb->metadata_flags & BLOCK_FLAG_RAID5 || Vcb->system_flags & BLOCK_FLAG_RAID5)) {
ExReleaseResourceLite(&Vcb->tree_lock);
ERR("would not be enough devices to satisfy RAID requirement (RAID5)\n");
return STATUS_CANNOT_DELETE;
}
if (num_rw_devices == 2 &&
((Vcb->data_flags & BLOCK_FLAG_RAID0 || Vcb->metadata_flags & BLOCK_FLAG_RAID0 || Vcb->system_flags & BLOCK_FLAG_RAID0) ||
(Vcb->data_flags & BLOCK_FLAG_RAID1 || Vcb->metadata_flags & BLOCK_FLAG_RAID1 || Vcb->system_flags & BLOCK_FLAG_RAID1))
) {
ExReleaseResourceLite(&Vcb->tree_lock);
ERR("would not be enough devices to satisfy RAID requirement (RAID0/1)\n");
return STATUS_CANNOT_DELETE;
}
}
ExReleaseResourceLite(&Vcb->tree_lock);
if (Vcb->balance.thread) {
WARN("balance already running\n");
return STATUS_DEVICE_NOT_READY;
}
dev->reloc = true;
RtlZeroMemory(Vcb->balance.opts, sizeof(btrfs_balance_opts) * 3);
for (i = 0; i < 3; i++) {
Vcb->balance.opts[i].flags = BTRFS_BALANCE_OPTS_ENABLED | BTRFS_BALANCE_OPTS_DEVID;
Vcb->balance.opts[i].devid = devid;
}
Vcb->balance.paused = false;
Vcb->balance.removing = true;
Vcb->balance.shrinking = false;
Vcb->balance.status = STATUS_SUCCESS;
KeInitializeEvent(&Vcb->balance.event, NotificationEvent, !Vcb->balance.paused);
InitializeObjectAttributes(&oa, NULL, OBJ_KERNEL_HANDLE, NULL, NULL);
Status = PsCreateSystemThread(&Vcb->balance.thread, 0, &oa, NULL, NULL, balance_thread, Vcb);
if (!NT_SUCCESS(Status)) {
ERR("PsCreateSystemThread returned %08x\n", Status);
dev->reloc = false;
return Status;
}
return STATUS_SUCCESS;
}
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