1007 lines
24 KiB
C
1007 lines
24 KiB
C
/*
|
|
* Copyright (C) 2012 Red Hat, Inc.
|
|
*
|
|
* This file is released under the GPL.
|
|
*/
|
|
|
|
#include "dm-array.h"
|
|
#include "dm-space-map.h"
|
|
#include "dm-transaction-manager.h"
|
|
|
|
#include <linux/export.h>
|
|
#include <linux/device-mapper.h>
|
|
|
|
#define DM_MSG_PREFIX "array"
|
|
|
|
/*----------------------------------------------------------------*/
|
|
|
|
/*
|
|
* The array is implemented as a fully populated btree, which points to
|
|
* blocks that contain the packed values. This is more space efficient
|
|
* than just using a btree since we don't store 1 key per value.
|
|
*/
|
|
struct array_block {
|
|
__le32 csum;
|
|
__le32 max_entries;
|
|
__le32 nr_entries;
|
|
__le32 value_size;
|
|
__le64 blocknr; /* Block this node is supposed to live in. */
|
|
} __packed;
|
|
|
|
/*----------------------------------------------------------------*/
|
|
|
|
/*
|
|
* Validator methods. As usual we calculate a checksum, and also write the
|
|
* block location into the header (paranoia about ssds remapping areas by
|
|
* mistake).
|
|
*/
|
|
#define CSUM_XOR 595846735
|
|
|
|
static void array_block_prepare_for_write(struct dm_block_validator *v,
|
|
struct dm_block *b,
|
|
size_t size_of_block)
|
|
{
|
|
struct array_block *bh_le = dm_block_data(b);
|
|
|
|
bh_le->blocknr = cpu_to_le64(dm_block_location(b));
|
|
bh_le->csum = cpu_to_le32(dm_bm_checksum(&bh_le->max_entries,
|
|
size_of_block - sizeof(__le32),
|
|
CSUM_XOR));
|
|
}
|
|
|
|
static int array_block_check(struct dm_block_validator *v,
|
|
struct dm_block *b,
|
|
size_t size_of_block)
|
|
{
|
|
struct array_block *bh_le = dm_block_data(b);
|
|
__le32 csum_disk;
|
|
|
|
if (dm_block_location(b) != le64_to_cpu(bh_le->blocknr)) {
|
|
DMERR_LIMIT("array_block_check failed: blocknr %llu != wanted %llu",
|
|
(unsigned long long) le64_to_cpu(bh_le->blocknr),
|
|
(unsigned long long) dm_block_location(b));
|
|
return -ENOTBLK;
|
|
}
|
|
|
|
csum_disk = cpu_to_le32(dm_bm_checksum(&bh_le->max_entries,
|
|
size_of_block - sizeof(__le32),
|
|
CSUM_XOR));
|
|
if (csum_disk != bh_le->csum) {
|
|
DMERR_LIMIT("array_block_check failed: csum %u != wanted %u",
|
|
(unsigned) le32_to_cpu(csum_disk),
|
|
(unsigned) le32_to_cpu(bh_le->csum));
|
|
return -EILSEQ;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct dm_block_validator array_validator = {
|
|
.name = "array",
|
|
.prepare_for_write = array_block_prepare_for_write,
|
|
.check = array_block_check
|
|
};
|
|
|
|
/*----------------------------------------------------------------*/
|
|
|
|
/*
|
|
* Functions for manipulating the array blocks.
|
|
*/
|
|
|
|
/*
|
|
* Returns a pointer to a value within an array block.
|
|
*
|
|
* index - The index into _this_ specific block.
|
|
*/
|
|
static void *element_at(struct dm_array_info *info, struct array_block *ab,
|
|
unsigned index)
|
|
{
|
|
unsigned char *entry = (unsigned char *) (ab + 1);
|
|
|
|
entry += index * info->value_type.size;
|
|
|
|
return entry;
|
|
}
|
|
|
|
/*
|
|
* Utility function that calls one of the value_type methods on every value
|
|
* in an array block.
|
|
*/
|
|
static void on_entries(struct dm_array_info *info, struct array_block *ab,
|
|
void (*fn)(void *, const void *))
|
|
{
|
|
unsigned i, nr_entries = le32_to_cpu(ab->nr_entries);
|
|
|
|
for (i = 0; i < nr_entries; i++)
|
|
fn(info->value_type.context, element_at(info, ab, i));
|
|
}
|
|
|
|
/*
|
|
* Increment every value in an array block.
|
|
*/
|
|
static void inc_ablock_entries(struct dm_array_info *info, struct array_block *ab)
|
|
{
|
|
struct dm_btree_value_type *vt = &info->value_type;
|
|
|
|
if (vt->inc)
|
|
on_entries(info, ab, vt->inc);
|
|
}
|
|
|
|
/*
|
|
* Decrement every value in an array block.
|
|
*/
|
|
static void dec_ablock_entries(struct dm_array_info *info, struct array_block *ab)
|
|
{
|
|
struct dm_btree_value_type *vt = &info->value_type;
|
|
|
|
if (vt->dec)
|
|
on_entries(info, ab, vt->dec);
|
|
}
|
|
|
|
/*
|
|
* Each array block can hold this many values.
|
|
*/
|
|
static uint32_t calc_max_entries(size_t value_size, size_t size_of_block)
|
|
{
|
|
return (size_of_block - sizeof(struct array_block)) / value_size;
|
|
}
|
|
|
|
/*
|
|
* Allocate a new array block. The caller will need to unlock block.
|
|
*/
|
|
static int alloc_ablock(struct dm_array_info *info, size_t size_of_block,
|
|
uint32_t max_entries,
|
|
struct dm_block **block, struct array_block **ab)
|
|
{
|
|
int r;
|
|
|
|
r = dm_tm_new_block(info->btree_info.tm, &array_validator, block);
|
|
if (r)
|
|
return r;
|
|
|
|
(*ab) = dm_block_data(*block);
|
|
(*ab)->max_entries = cpu_to_le32(max_entries);
|
|
(*ab)->nr_entries = cpu_to_le32(0);
|
|
(*ab)->value_size = cpu_to_le32(info->value_type.size);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Pad an array block out with a particular value. Every instance will
|
|
* cause an increment of the value_type. new_nr must always be more than
|
|
* the current number of entries.
|
|
*/
|
|
static void fill_ablock(struct dm_array_info *info, struct array_block *ab,
|
|
const void *value, unsigned new_nr)
|
|
{
|
|
unsigned i;
|
|
uint32_t nr_entries;
|
|
struct dm_btree_value_type *vt = &info->value_type;
|
|
|
|
BUG_ON(new_nr > le32_to_cpu(ab->max_entries));
|
|
BUG_ON(new_nr < le32_to_cpu(ab->nr_entries));
|
|
|
|
nr_entries = le32_to_cpu(ab->nr_entries);
|
|
for (i = nr_entries; i < new_nr; i++) {
|
|
if (vt->inc)
|
|
vt->inc(vt->context, value);
|
|
memcpy(element_at(info, ab, i), value, vt->size);
|
|
}
|
|
ab->nr_entries = cpu_to_le32(new_nr);
|
|
}
|
|
|
|
/*
|
|
* Remove some entries from the back of an array block. Every value
|
|
* removed will be decremented. new_nr must be <= the current number of
|
|
* entries.
|
|
*/
|
|
static void trim_ablock(struct dm_array_info *info, struct array_block *ab,
|
|
unsigned new_nr)
|
|
{
|
|
unsigned i;
|
|
uint32_t nr_entries;
|
|
struct dm_btree_value_type *vt = &info->value_type;
|
|
|
|
BUG_ON(new_nr > le32_to_cpu(ab->max_entries));
|
|
BUG_ON(new_nr > le32_to_cpu(ab->nr_entries));
|
|
|
|
nr_entries = le32_to_cpu(ab->nr_entries);
|
|
for (i = nr_entries; i > new_nr; i--)
|
|
if (vt->dec)
|
|
vt->dec(vt->context, element_at(info, ab, i - 1));
|
|
ab->nr_entries = cpu_to_le32(new_nr);
|
|
}
|
|
|
|
/*
|
|
* Read locks a block, and coerces it to an array block. The caller must
|
|
* unlock 'block' when finished.
|
|
*/
|
|
static int get_ablock(struct dm_array_info *info, dm_block_t b,
|
|
struct dm_block **block, struct array_block **ab)
|
|
{
|
|
int r;
|
|
|
|
r = dm_tm_read_lock(info->btree_info.tm, b, &array_validator, block);
|
|
if (r)
|
|
return r;
|
|
|
|
*ab = dm_block_data(*block);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Unlocks an array block.
|
|
*/
|
|
static void unlock_ablock(struct dm_array_info *info, struct dm_block *block)
|
|
{
|
|
dm_tm_unlock(info->btree_info.tm, block);
|
|
}
|
|
|
|
/*----------------------------------------------------------------*/
|
|
|
|
/*
|
|
* Btree manipulation.
|
|
*/
|
|
|
|
/*
|
|
* Looks up an array block in the btree, and then read locks it.
|
|
*
|
|
* index is the index of the index of the array_block, (ie. the array index
|
|
* / max_entries).
|
|
*/
|
|
static int lookup_ablock(struct dm_array_info *info, dm_block_t root,
|
|
unsigned index, struct dm_block **block,
|
|
struct array_block **ab)
|
|
{
|
|
int r;
|
|
uint64_t key = index;
|
|
__le64 block_le;
|
|
|
|
r = dm_btree_lookup(&info->btree_info, root, &key, &block_le);
|
|
if (r)
|
|
return r;
|
|
|
|
return get_ablock(info, le64_to_cpu(block_le), block, ab);
|
|
}
|
|
|
|
/*
|
|
* Insert an array block into the btree. The block is _not_ unlocked.
|
|
*/
|
|
static int insert_ablock(struct dm_array_info *info, uint64_t index,
|
|
struct dm_block *block, dm_block_t *root)
|
|
{
|
|
__le64 block_le = cpu_to_le64(dm_block_location(block));
|
|
|
|
__dm_bless_for_disk(block_le);
|
|
return dm_btree_insert(&info->btree_info, *root, &index, &block_le, root);
|
|
}
|
|
|
|
/*----------------------------------------------------------------*/
|
|
|
|
static int __shadow_ablock(struct dm_array_info *info, dm_block_t b,
|
|
struct dm_block **block, struct array_block **ab)
|
|
{
|
|
int inc;
|
|
int r = dm_tm_shadow_block(info->btree_info.tm, b,
|
|
&array_validator, block, &inc);
|
|
if (r)
|
|
return r;
|
|
|
|
*ab = dm_block_data(*block);
|
|
if (inc)
|
|
inc_ablock_entries(info, *ab);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* The shadow op will often be a noop. Only insert if it really
|
|
* copied data.
|
|
*/
|
|
static int __reinsert_ablock(struct dm_array_info *info, unsigned index,
|
|
struct dm_block *block, dm_block_t b,
|
|
dm_block_t *root)
|
|
{
|
|
int r = 0;
|
|
|
|
if (dm_block_location(block) != b) {
|
|
/*
|
|
* dm_tm_shadow_block will have already decremented the old
|
|
* block, but it is still referenced by the btree. We
|
|
* increment to stop the insert decrementing it below zero
|
|
* when overwriting the old value.
|
|
*/
|
|
dm_tm_inc(info->btree_info.tm, b);
|
|
r = insert_ablock(info, index, block, root);
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
/*
|
|
* Looks up an array block in the btree. Then shadows it, and updates the
|
|
* btree to point to this new shadow. 'root' is an input/output parameter
|
|
* for both the current root block, and the new one.
|
|
*/
|
|
static int shadow_ablock(struct dm_array_info *info, dm_block_t *root,
|
|
unsigned index, struct dm_block **block,
|
|
struct array_block **ab)
|
|
{
|
|
int r;
|
|
uint64_t key = index;
|
|
dm_block_t b;
|
|
__le64 block_le;
|
|
|
|
r = dm_btree_lookup(&info->btree_info, *root, &key, &block_le);
|
|
if (r)
|
|
return r;
|
|
b = le64_to_cpu(block_le);
|
|
|
|
r = __shadow_ablock(info, b, block, ab);
|
|
if (r)
|
|
return r;
|
|
|
|
return __reinsert_ablock(info, index, *block, b, root);
|
|
}
|
|
|
|
/*
|
|
* Allocate an new array block, and fill it with some values.
|
|
*/
|
|
static int insert_new_ablock(struct dm_array_info *info, size_t size_of_block,
|
|
uint32_t max_entries,
|
|
unsigned block_index, uint32_t nr,
|
|
const void *value, dm_block_t *root)
|
|
{
|
|
int r;
|
|
struct dm_block *block;
|
|
struct array_block *ab;
|
|
|
|
r = alloc_ablock(info, size_of_block, max_entries, &block, &ab);
|
|
if (r)
|
|
return r;
|
|
|
|
fill_ablock(info, ab, value, nr);
|
|
r = insert_ablock(info, block_index, block, root);
|
|
unlock_ablock(info, block);
|
|
|
|
return r;
|
|
}
|
|
|
|
static int insert_full_ablocks(struct dm_array_info *info, size_t size_of_block,
|
|
unsigned begin_block, unsigned end_block,
|
|
unsigned max_entries, const void *value,
|
|
dm_block_t *root)
|
|
{
|
|
int r = 0;
|
|
|
|
for (; !r && begin_block != end_block; begin_block++)
|
|
r = insert_new_ablock(info, size_of_block, max_entries, begin_block, max_entries, value, root);
|
|
|
|
return r;
|
|
}
|
|
|
|
/*
|
|
* There are a bunch of functions involved with resizing an array. This
|
|
* structure holds information that commonly needed by them. Purely here
|
|
* to reduce parameter count.
|
|
*/
|
|
struct resize {
|
|
/*
|
|
* Describes the array.
|
|
*/
|
|
struct dm_array_info *info;
|
|
|
|
/*
|
|
* The current root of the array. This gets updated.
|
|
*/
|
|
dm_block_t root;
|
|
|
|
/*
|
|
* Metadata block size. Used to calculate the nr entries in an
|
|
* array block.
|
|
*/
|
|
size_t size_of_block;
|
|
|
|
/*
|
|
* Maximum nr entries in an array block.
|
|
*/
|
|
unsigned max_entries;
|
|
|
|
/*
|
|
* nr of completely full blocks in the array.
|
|
*
|
|
* 'old' refers to before the resize, 'new' after.
|
|
*/
|
|
unsigned old_nr_full_blocks, new_nr_full_blocks;
|
|
|
|
/*
|
|
* Number of entries in the final block. 0 iff only full blocks in
|
|
* the array.
|
|
*/
|
|
unsigned old_nr_entries_in_last_block, new_nr_entries_in_last_block;
|
|
|
|
/*
|
|
* The default value used when growing the array.
|
|
*/
|
|
const void *value;
|
|
};
|
|
|
|
/*
|
|
* Removes a consecutive set of array blocks from the btree. The values
|
|
* in block are decremented as a side effect of the btree remove.
|
|
*
|
|
* begin_index - the index of the first array block to remove.
|
|
* end_index - the one-past-the-end value. ie. this block is not removed.
|
|
*/
|
|
static int drop_blocks(struct resize *resize, unsigned begin_index,
|
|
unsigned end_index)
|
|
{
|
|
int r;
|
|
|
|
while (begin_index != end_index) {
|
|
uint64_t key = begin_index++;
|
|
r = dm_btree_remove(&resize->info->btree_info, resize->root,
|
|
&key, &resize->root);
|
|
if (r)
|
|
return r;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Calculates how many blocks are needed for the array.
|
|
*/
|
|
static unsigned total_nr_blocks_needed(unsigned nr_full_blocks,
|
|
unsigned nr_entries_in_last_block)
|
|
{
|
|
return nr_full_blocks + (nr_entries_in_last_block ? 1 : 0);
|
|
}
|
|
|
|
/*
|
|
* Shrink an array.
|
|
*/
|
|
static int shrink(struct resize *resize)
|
|
{
|
|
int r;
|
|
unsigned begin, end;
|
|
struct dm_block *block;
|
|
struct array_block *ab;
|
|
|
|
/*
|
|
* Lose some blocks from the back?
|
|
*/
|
|
if (resize->new_nr_full_blocks < resize->old_nr_full_blocks) {
|
|
begin = total_nr_blocks_needed(resize->new_nr_full_blocks,
|
|
resize->new_nr_entries_in_last_block);
|
|
end = total_nr_blocks_needed(resize->old_nr_full_blocks,
|
|
resize->old_nr_entries_in_last_block);
|
|
|
|
r = drop_blocks(resize, begin, end);
|
|
if (r)
|
|
return r;
|
|
}
|
|
|
|
/*
|
|
* Trim the new tail block
|
|
*/
|
|
if (resize->new_nr_entries_in_last_block) {
|
|
r = shadow_ablock(resize->info, &resize->root,
|
|
resize->new_nr_full_blocks, &block, &ab);
|
|
if (r)
|
|
return r;
|
|
|
|
trim_ablock(resize->info, ab, resize->new_nr_entries_in_last_block);
|
|
unlock_ablock(resize->info, block);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Grow an array.
|
|
*/
|
|
static int grow_extend_tail_block(struct resize *resize, uint32_t new_nr_entries)
|
|
{
|
|
int r;
|
|
struct dm_block *block;
|
|
struct array_block *ab;
|
|
|
|
r = shadow_ablock(resize->info, &resize->root,
|
|
resize->old_nr_full_blocks, &block, &ab);
|
|
if (r)
|
|
return r;
|
|
|
|
fill_ablock(resize->info, ab, resize->value, new_nr_entries);
|
|
unlock_ablock(resize->info, block);
|
|
|
|
return r;
|
|
}
|
|
|
|
static int grow_add_tail_block(struct resize *resize)
|
|
{
|
|
return insert_new_ablock(resize->info, resize->size_of_block,
|
|
resize->max_entries,
|
|
resize->new_nr_full_blocks,
|
|
resize->new_nr_entries_in_last_block,
|
|
resize->value, &resize->root);
|
|
}
|
|
|
|
static int grow_needs_more_blocks(struct resize *resize)
|
|
{
|
|
int r;
|
|
unsigned old_nr_blocks = resize->old_nr_full_blocks;
|
|
|
|
if (resize->old_nr_entries_in_last_block > 0) {
|
|
old_nr_blocks++;
|
|
|
|
r = grow_extend_tail_block(resize, resize->max_entries);
|
|
if (r)
|
|
return r;
|
|
}
|
|
|
|
r = insert_full_ablocks(resize->info, resize->size_of_block,
|
|
old_nr_blocks,
|
|
resize->new_nr_full_blocks,
|
|
resize->max_entries, resize->value,
|
|
&resize->root);
|
|
if (r)
|
|
return r;
|
|
|
|
if (resize->new_nr_entries_in_last_block)
|
|
r = grow_add_tail_block(resize);
|
|
|
|
return r;
|
|
}
|
|
|
|
static int grow(struct resize *resize)
|
|
{
|
|
if (resize->new_nr_full_blocks > resize->old_nr_full_blocks)
|
|
return grow_needs_more_blocks(resize);
|
|
|
|
else if (resize->old_nr_entries_in_last_block)
|
|
return grow_extend_tail_block(resize, resize->new_nr_entries_in_last_block);
|
|
|
|
else
|
|
return grow_add_tail_block(resize);
|
|
}
|
|
|
|
/*----------------------------------------------------------------*/
|
|
|
|
/*
|
|
* These are the value_type functions for the btree elements, which point
|
|
* to array blocks.
|
|
*/
|
|
static void block_inc(void *context, const void *value)
|
|
{
|
|
__le64 block_le;
|
|
struct dm_array_info *info = context;
|
|
|
|
memcpy(&block_le, value, sizeof(block_le));
|
|
dm_tm_inc(info->btree_info.tm, le64_to_cpu(block_le));
|
|
}
|
|
|
|
static void block_dec(void *context, const void *value)
|
|
{
|
|
int r;
|
|
uint64_t b;
|
|
__le64 block_le;
|
|
uint32_t ref_count;
|
|
struct dm_block *block;
|
|
struct array_block *ab;
|
|
struct dm_array_info *info = context;
|
|
|
|
memcpy(&block_le, value, sizeof(block_le));
|
|
b = le64_to_cpu(block_le);
|
|
|
|
r = dm_tm_ref(info->btree_info.tm, b, &ref_count);
|
|
if (r) {
|
|
DMERR_LIMIT("couldn't get reference count for block %llu",
|
|
(unsigned long long) b);
|
|
return;
|
|
}
|
|
|
|
if (ref_count == 1) {
|
|
/*
|
|
* We're about to drop the last reference to this ablock.
|
|
* So we need to decrement the ref count of the contents.
|
|
*/
|
|
r = get_ablock(info, b, &block, &ab);
|
|
if (r) {
|
|
DMERR_LIMIT("couldn't get array block %llu",
|
|
(unsigned long long) b);
|
|
return;
|
|
}
|
|
|
|
dec_ablock_entries(info, ab);
|
|
unlock_ablock(info, block);
|
|
}
|
|
|
|
dm_tm_dec(info->btree_info.tm, b);
|
|
}
|
|
|
|
static int block_equal(void *context, const void *value1, const void *value2)
|
|
{
|
|
return !memcmp(value1, value2, sizeof(__le64));
|
|
}
|
|
|
|
/*----------------------------------------------------------------*/
|
|
|
|
void dm_array_info_init(struct dm_array_info *info,
|
|
struct dm_transaction_manager *tm,
|
|
struct dm_btree_value_type *vt)
|
|
{
|
|
struct dm_btree_value_type *bvt = &info->btree_info.value_type;
|
|
|
|
memcpy(&info->value_type, vt, sizeof(info->value_type));
|
|
info->btree_info.tm = tm;
|
|
info->btree_info.levels = 1;
|
|
|
|
bvt->context = info;
|
|
bvt->size = sizeof(__le64);
|
|
bvt->inc = block_inc;
|
|
bvt->dec = block_dec;
|
|
bvt->equal = block_equal;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dm_array_info_init);
|
|
|
|
int dm_array_empty(struct dm_array_info *info, dm_block_t *root)
|
|
{
|
|
return dm_btree_empty(&info->btree_info, root);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dm_array_empty);
|
|
|
|
static int array_resize(struct dm_array_info *info, dm_block_t root,
|
|
uint32_t old_size, uint32_t new_size,
|
|
const void *value, dm_block_t *new_root)
|
|
{
|
|
int r;
|
|
struct resize resize;
|
|
|
|
if (old_size == new_size) {
|
|
*new_root = root;
|
|
return 0;
|
|
}
|
|
|
|
resize.info = info;
|
|
resize.root = root;
|
|
resize.size_of_block = dm_bm_block_size(dm_tm_get_bm(info->btree_info.tm));
|
|
resize.max_entries = calc_max_entries(info->value_type.size,
|
|
resize.size_of_block);
|
|
|
|
resize.old_nr_full_blocks = old_size / resize.max_entries;
|
|
resize.old_nr_entries_in_last_block = old_size % resize.max_entries;
|
|
resize.new_nr_full_blocks = new_size / resize.max_entries;
|
|
resize.new_nr_entries_in_last_block = new_size % resize.max_entries;
|
|
resize.value = value;
|
|
|
|
r = ((new_size > old_size) ? grow : shrink)(&resize);
|
|
if (r)
|
|
return r;
|
|
|
|
*new_root = resize.root;
|
|
return 0;
|
|
}
|
|
|
|
int dm_array_resize(struct dm_array_info *info, dm_block_t root,
|
|
uint32_t old_size, uint32_t new_size,
|
|
const void *value, dm_block_t *new_root)
|
|
__dm_written_to_disk(value)
|
|
{
|
|
int r = array_resize(info, root, old_size, new_size, value, new_root);
|
|
__dm_unbless_for_disk(value);
|
|
return r;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dm_array_resize);
|
|
|
|
static int populate_ablock_with_values(struct dm_array_info *info, struct array_block *ab,
|
|
value_fn fn, void *context, unsigned base, unsigned new_nr)
|
|
{
|
|
int r;
|
|
unsigned i;
|
|
struct dm_btree_value_type *vt = &info->value_type;
|
|
|
|
BUG_ON(le32_to_cpu(ab->nr_entries));
|
|
BUG_ON(new_nr > le32_to_cpu(ab->max_entries));
|
|
|
|
for (i = 0; i < new_nr; i++) {
|
|
r = fn(base + i, element_at(info, ab, i), context);
|
|
if (r)
|
|
return r;
|
|
|
|
if (vt->inc)
|
|
vt->inc(vt->context, element_at(info, ab, i));
|
|
}
|
|
|
|
ab->nr_entries = cpu_to_le32(new_nr);
|
|
return 0;
|
|
}
|
|
|
|
int dm_array_new(struct dm_array_info *info, dm_block_t *root,
|
|
uint32_t size, value_fn fn, void *context)
|
|
{
|
|
int r;
|
|
struct dm_block *block;
|
|
struct array_block *ab;
|
|
unsigned block_index, end_block, size_of_block, max_entries;
|
|
|
|
r = dm_array_empty(info, root);
|
|
if (r)
|
|
return r;
|
|
|
|
size_of_block = dm_bm_block_size(dm_tm_get_bm(info->btree_info.tm));
|
|
max_entries = calc_max_entries(info->value_type.size, size_of_block);
|
|
end_block = dm_div_up(size, max_entries);
|
|
|
|
for (block_index = 0; block_index != end_block; block_index++) {
|
|
r = alloc_ablock(info, size_of_block, max_entries, &block, &ab);
|
|
if (r)
|
|
break;
|
|
|
|
r = populate_ablock_with_values(info, ab, fn, context,
|
|
block_index * max_entries,
|
|
min(max_entries, size));
|
|
if (r) {
|
|
unlock_ablock(info, block);
|
|
break;
|
|
}
|
|
|
|
r = insert_ablock(info, block_index, block, root);
|
|
unlock_ablock(info, block);
|
|
if (r)
|
|
break;
|
|
|
|
size -= max_entries;
|
|
}
|
|
|
|
return r;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dm_array_new);
|
|
|
|
int dm_array_del(struct dm_array_info *info, dm_block_t root)
|
|
{
|
|
return dm_btree_del(&info->btree_info, root);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dm_array_del);
|
|
|
|
int dm_array_get_value(struct dm_array_info *info, dm_block_t root,
|
|
uint32_t index, void *value_le)
|
|
{
|
|
int r;
|
|
struct dm_block *block;
|
|
struct array_block *ab;
|
|
size_t size_of_block;
|
|
unsigned entry, max_entries;
|
|
|
|
size_of_block = dm_bm_block_size(dm_tm_get_bm(info->btree_info.tm));
|
|
max_entries = calc_max_entries(info->value_type.size, size_of_block);
|
|
|
|
r = lookup_ablock(info, root, index / max_entries, &block, &ab);
|
|
if (r)
|
|
return r;
|
|
|
|
entry = index % max_entries;
|
|
if (entry >= le32_to_cpu(ab->nr_entries))
|
|
r = -ENODATA;
|
|
else
|
|
memcpy(value_le, element_at(info, ab, entry),
|
|
info->value_type.size);
|
|
|
|
unlock_ablock(info, block);
|
|
return r;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dm_array_get_value);
|
|
|
|
static int array_set_value(struct dm_array_info *info, dm_block_t root,
|
|
uint32_t index, const void *value, dm_block_t *new_root)
|
|
{
|
|
int r;
|
|
struct dm_block *block;
|
|
struct array_block *ab;
|
|
size_t size_of_block;
|
|
unsigned max_entries;
|
|
unsigned entry;
|
|
void *old_value;
|
|
struct dm_btree_value_type *vt = &info->value_type;
|
|
|
|
size_of_block = dm_bm_block_size(dm_tm_get_bm(info->btree_info.tm));
|
|
max_entries = calc_max_entries(info->value_type.size, size_of_block);
|
|
|
|
r = shadow_ablock(info, &root, index / max_entries, &block, &ab);
|
|
if (r)
|
|
return r;
|
|
*new_root = root;
|
|
|
|
entry = index % max_entries;
|
|
if (entry >= le32_to_cpu(ab->nr_entries)) {
|
|
r = -ENODATA;
|
|
goto out;
|
|
}
|
|
|
|
old_value = element_at(info, ab, entry);
|
|
if (vt->dec &&
|
|
(!vt->equal || !vt->equal(vt->context, old_value, value))) {
|
|
vt->dec(vt->context, old_value);
|
|
if (vt->inc)
|
|
vt->inc(vt->context, value);
|
|
}
|
|
|
|
memcpy(old_value, value, info->value_type.size);
|
|
|
|
out:
|
|
unlock_ablock(info, block);
|
|
return r;
|
|
}
|
|
|
|
int dm_array_set_value(struct dm_array_info *info, dm_block_t root,
|
|
uint32_t index, const void *value, dm_block_t *new_root)
|
|
__dm_written_to_disk(value)
|
|
{
|
|
int r;
|
|
|
|
r = array_set_value(info, root, index, value, new_root);
|
|
__dm_unbless_for_disk(value);
|
|
return r;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dm_array_set_value);
|
|
|
|
struct walk_info {
|
|
struct dm_array_info *info;
|
|
int (*fn)(void *context, uint64_t key, void *leaf);
|
|
void *context;
|
|
};
|
|
|
|
static int walk_ablock(void *context, uint64_t *keys, void *leaf)
|
|
{
|
|
struct walk_info *wi = context;
|
|
|
|
int r;
|
|
unsigned i;
|
|
__le64 block_le;
|
|
unsigned nr_entries, max_entries;
|
|
struct dm_block *block;
|
|
struct array_block *ab;
|
|
|
|
memcpy(&block_le, leaf, sizeof(block_le));
|
|
r = get_ablock(wi->info, le64_to_cpu(block_le), &block, &ab);
|
|
if (r)
|
|
return r;
|
|
|
|
max_entries = le32_to_cpu(ab->max_entries);
|
|
nr_entries = le32_to_cpu(ab->nr_entries);
|
|
for (i = 0; i < nr_entries; i++) {
|
|
r = wi->fn(wi->context, keys[0] * max_entries + i,
|
|
element_at(wi->info, ab, i));
|
|
|
|
if (r)
|
|
break;
|
|
}
|
|
|
|
unlock_ablock(wi->info, block);
|
|
return r;
|
|
}
|
|
|
|
int dm_array_walk(struct dm_array_info *info, dm_block_t root,
|
|
int (*fn)(void *, uint64_t key, void *leaf),
|
|
void *context)
|
|
{
|
|
struct walk_info wi;
|
|
|
|
wi.info = info;
|
|
wi.fn = fn;
|
|
wi.context = context;
|
|
|
|
return dm_btree_walk(&info->btree_info, root, walk_ablock, &wi);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dm_array_walk);
|
|
|
|
/*----------------------------------------------------------------*/
|
|
|
|
static int load_ablock(struct dm_array_cursor *c)
|
|
{
|
|
int r;
|
|
__le64 value_le;
|
|
uint64_t key;
|
|
|
|
if (c->block)
|
|
unlock_ablock(c->info, c->block);
|
|
|
|
c->block = NULL;
|
|
c->ab = NULL;
|
|
c->index = 0;
|
|
|
|
r = dm_btree_cursor_get_value(&c->cursor, &key, &value_le);
|
|
if (r) {
|
|
DMERR("dm_btree_cursor_get_value failed");
|
|
dm_btree_cursor_end(&c->cursor);
|
|
|
|
} else {
|
|
r = get_ablock(c->info, le64_to_cpu(value_le), &c->block, &c->ab);
|
|
if (r) {
|
|
DMERR("get_ablock failed");
|
|
dm_btree_cursor_end(&c->cursor);
|
|
}
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
int dm_array_cursor_begin(struct dm_array_info *info, dm_block_t root,
|
|
struct dm_array_cursor *c)
|
|
{
|
|
int r;
|
|
|
|
memset(c, 0, sizeof(*c));
|
|
c->info = info;
|
|
r = dm_btree_cursor_begin(&info->btree_info, root, true, &c->cursor);
|
|
if (r) {
|
|
DMERR("couldn't create btree cursor");
|
|
return r;
|
|
}
|
|
|
|
return load_ablock(c);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dm_array_cursor_begin);
|
|
|
|
void dm_array_cursor_end(struct dm_array_cursor *c)
|
|
{
|
|
if (c->block) {
|
|
unlock_ablock(c->info, c->block);
|
|
dm_btree_cursor_end(&c->cursor);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(dm_array_cursor_end);
|
|
|
|
int dm_array_cursor_next(struct dm_array_cursor *c)
|
|
{
|
|
int r;
|
|
|
|
if (!c->block)
|
|
return -ENODATA;
|
|
|
|
c->index++;
|
|
|
|
if (c->index >= le32_to_cpu(c->ab->nr_entries)) {
|
|
r = dm_btree_cursor_next(&c->cursor);
|
|
if (r)
|
|
return r;
|
|
|
|
r = load_ablock(c);
|
|
if (r)
|
|
return r;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dm_array_cursor_next);
|
|
|
|
int dm_array_cursor_skip(struct dm_array_cursor *c, uint32_t count)
|
|
{
|
|
int r;
|
|
|
|
do {
|
|
uint32_t remaining = le32_to_cpu(c->ab->nr_entries) - c->index;
|
|
|
|
if (count < remaining) {
|
|
c->index += count;
|
|
return 0;
|
|
}
|
|
|
|
count -= remaining;
|
|
r = dm_array_cursor_next(c);
|
|
|
|
} while (!r);
|
|
|
|
return r;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dm_array_cursor_skip);
|
|
|
|
void dm_array_cursor_get_value(struct dm_array_cursor *c, void **value_le)
|
|
{
|
|
*value_le = element_at(c->info, c->ab, c->index);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dm_array_cursor_get_value);
|
|
|
|
/*----------------------------------------------------------------*/
|