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bbuild.c
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/*
* NOVA Recovery routines.
*
* Copyright 2020-2023 Jiansheng Qiu <[email protected]>
* Copyright 2015-2016 Regents of the University of California,
* UCSD Non-Volatile Systems Lab, Andiry Xu <[email protected]>
* Copyright 2012-2013 Intel Corporation
* Copyright 2009-2011 Marco Stornelli <[email protected]>
* Copyright 2003 Sony Corporation
* Copyright 2003 Matsushita Electric Industrial Co., Ltd.
* 2003-2004 (c) MontaVista Software, Inc. , Steve Longerbeam
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <linux/fs.h>
#include <linux/bitops.h>
#include <linux/slab.h>
#include <linux/random.h>
#include <linux/delay.h>
#include <linux/xarray.h>
#include "nova.h"
#include "journal.h"
#include "super.h"
#include "inode.h"
#include "log.h"
#include "joinable.h"
#include "xatable.h"
#include "arithmetic.h"
// #define static _Static_assert(1, "2333");
struct scan_bitmap {
unsigned long bitmap_size;
unsigned long *bitmap;
};
void nova_init_header(struct super_block *sb,
struct nova_inode_info_header *sih, u16 i_mode)
{
sih->log_pages = 0;
sih->i_size = 0;
sih->ino = 0;
sih->i_blocks = 0;
sih->pi_addr = 0;
sih->alter_pi_addr = 0;
INIT_RADIX_TREE(&sih->tree, GFP_ATOMIC);
sih->rb_tree = RB_ROOT;
sih->vma_tree = RB_ROOT;
sih->num_vmas = 0;
INIT_LIST_HEAD(&sih->list);
sih->i_mode = i_mode;
sih->i_flags = 0;
sih->valid_entries = 0;
sih->num_entries = 0;
sih->last_setattr = 0;
sih->last_link_change = 0;
sih->last_dentry = 0;
sih->trans_id = 0;
sih->log_head = 0;
sih->log_tail = 0;
sih->alter_log_head = 0;
sih->alter_log_tail = 0;
sih->i_blk_type = NOVA_DEFAULT_BLOCK_TYPE;
sih->set_advise = false;
}
static inline int get_block_cpuid(struct nova_sb_info *sbi,
unsigned long blocknr)
{
return blocknr / sbi->per_list_blocks;
}
static int nova_failure_insert_inodetree(struct super_block *sb,
unsigned long ino_low, unsigned long ino_high)
{
struct nova_sb_info *sbi = NOVA_SB(sb);
struct inode_map *inode_map;
struct nova_range_node *prev = NULL, *next = NULL;
struct nova_range_node *new_node;
unsigned long internal_low, internal_high;
int cpu;
struct rb_root *tree;
int ret;
if (ino_low > ino_high) {
nova_err(sb, "%s: ino low %lu, ino high %lu\n",
__func__, ino_low, ino_high);
BUG();
}
cpu = ino_low % sbi->cpus;
if (ino_high % sbi->cpus != cpu) {
nova_err(sb, "%s: ino low %lu, ino high %lu\n",
__func__, ino_low, ino_high);
BUG();
}
internal_low = ino_low / sbi->cpus;
internal_high = ino_high / sbi->cpus;
inode_map = &sbi->inode_maps[cpu];
tree = &inode_map->inode_inuse_tree;
mutex_lock(&inode_map->inode_table_mutex);
ret = nova_find_free_slot(tree, internal_low, internal_high,
&prev, &next);
if (ret) {
nova_dbg("%s: ino %lu - %lu already exists!: %d\n",
__func__, ino_low, ino_high, ret);
mutex_unlock(&inode_map->inode_table_mutex);
return ret;
}
if (prev && next && (internal_low == prev->range_high + 1) &&
(internal_high + 1 == next->range_low)) {
/* fits the hole */
rb_erase(&next->node, tree);
inode_map->num_range_node_inode--;
prev->range_high = next->range_high;
nova_update_range_node_checksum(prev);
nova_free_inode_node(next);
goto finish;
}
if (prev && (internal_low == prev->range_high + 1)) {
/* Aligns left */
prev->range_high += internal_high - internal_low + 1;
nova_update_range_node_checksum(prev);
goto finish;
}
if (next && (internal_high + 1 == next->range_low)) {
/* Aligns right */
next->range_low -= internal_high - internal_low + 1;
nova_update_range_node_checksum(next);
goto finish;
}
/* Aligns somewhere in the middle */
new_node = nova_alloc_inode_node(sb);
NOVA_ASSERT(new_node);
new_node->range_low = internal_low;
new_node->range_high = internal_high;
nova_update_range_node_checksum(new_node);
ret = nova_insert_inodetree(sbi, new_node, cpu);
if (ret) {
nova_err(sb, "%s failed\n", __func__);
nova_free_inode_node(new_node);
goto finish;
}
inode_map->num_range_node_inode++;
finish:
mutex_unlock(&inode_map->inode_table_mutex);
return ret;
}
static void nova_destroy_blocknode_tree(struct super_block *sb, int cpu)
{
struct free_list *free_list;
free_list = nova_get_free_list(sb, cpu);
nova_destroy_range_node_tree(sb, &free_list->block_free_tree);
}
static void nova_destroy_blocknode_trees(struct super_block *sb)
{
struct nova_sb_info *sbi = NOVA_SB(sb);
int i;
for (i = 0; i < sbi->cpus; i++)
nova_destroy_blocknode_tree(sb, i);
}
static int nova_init_blockmap_from_inode(struct super_block *sb)
{
struct nova_sb_info *sbi = NOVA_SB(sb);
struct nova_inode *pi = nova_get_inode_by_ino(sb, NOVA_BLOCKNODE_INO);
struct nova_inode_info_header sih;
struct free_list *free_list;
struct nova_range_node_lowhigh *entry;
struct nova_range_node *blknode;
size_t size = sizeof(struct nova_range_node_lowhigh);
u64 curr_p;
u64 cpuid;
int ret = 0;
/* FIXME: Backup inode for BLOCKNODE */
ret = nova_get_head_tail(sb, pi, &sih);
if (ret)
goto out;
sih.ino = NOVA_BLOCKNODE_INO;
curr_p = sih.log_head;
if (curr_p == 0) {
nova_dbg("%s: pi head is 0!\n", __func__);
return -EINVAL;
}
while (curr_p != sih.log_tail) {
if (is_last_entry(curr_p, size))
curr_p = next_log_page(sb, curr_p);
if (curr_p == 0) {
nova_dbg("%s: curr_p is NULL!\n", __func__);
NOVA_ASSERT(0);
ret = -EINVAL;
break;
}
entry = (struct nova_range_node_lowhigh *)nova_get_block(sb,
curr_p);
blknode = nova_alloc_blocknode(sb);
if (blknode == NULL)
NOVA_ASSERT(0);
blknode->range_low = le64_to_cpu(entry->range_low);
blknode->range_high = le64_to_cpu(entry->range_high);
nova_update_range_node_checksum(blknode);
cpuid = get_block_cpuid(sbi, blknode->range_low);
/* FIXME: Assume NR_CPUS not change */
free_list = nova_get_free_list(sb, cpuid);
ret = nova_insert_blocktree(&free_list->block_free_tree,
blknode);
if (ret) {
nova_err(sb, "%s failed\n", __func__);
nova_free_blocknode(blknode);
NOVA_ASSERT(0);
nova_destroy_blocknode_trees(sb);
goto out;
}
free_list->num_blocknode++;
if (free_list->num_blocknode == 1)
free_list->first_node = blknode;
free_list->last_node = blknode;
free_list->num_free_blocks +=
blknode->range_high - blknode->range_low + 1;
curr_p += sizeof(struct nova_range_node_lowhigh);
}
out:
nova_free_inode_log(sb, pi, &sih);
return ret;
}
static void nova_destroy_inode_trees(struct super_block *sb)
{
struct nova_sb_info *sbi = NOVA_SB(sb);
struct inode_map *inode_map;
int i;
for (i = 0; i < sbi->cpus; i++) {
inode_map = &sbi->inode_maps[i];
nova_destroy_range_node_tree(sb,
&inode_map->inode_inuse_tree);
}
}
#define CPUID_MASK 0xff00000000000000
static int nova_init_inode_list_from_inode(struct super_block *sb)
{
struct nova_sb_info *sbi = NOVA_SB(sb);
struct nova_inode *pi = nova_get_inode_by_ino(sb, NOVA_INODELIST_INO);
struct nova_inode_info_header sih;
struct nova_range_node_lowhigh *entry;
struct nova_range_node *range_node;
struct inode_map *inode_map;
size_t size = sizeof(struct nova_range_node_lowhigh);
unsigned long num_inode_node = 0;
u64 curr_p;
unsigned long cpuid;
int ret;
/* FIXME: Backup inode for INODELIST */
ret = nova_get_head_tail(sb, pi, &sih);
if (ret)
goto out;
sih.ino = NOVA_INODELIST_INO;
sbi->s_inodes_used_count = 0;
curr_p = sih.log_head;
if (curr_p == 0) {
nova_dbg("%s: pi head is 0!\n", __func__);
return -EINVAL;
}
while (curr_p != sih.log_tail) {
if (is_last_entry(curr_p, size))
curr_p = next_log_page(sb, curr_p);
if (curr_p == 0) {
nova_dbg("%s: curr_p is NULL!\n", __func__);
NOVA_ASSERT(0);
}
entry = (struct nova_range_node_lowhigh *)nova_get_block(sb,
curr_p);
range_node = nova_alloc_inode_node(sb);
if (range_node == NULL)
NOVA_ASSERT(0);
cpuid = (entry->range_low & CPUID_MASK) >> 56;
if (cpuid >= sbi->cpus) {
nova_err(sb, "Invalid cpuid %lu\n", cpuid);
nova_free_inode_node(range_node);
NOVA_ASSERT(0);
nova_destroy_inode_trees(sb);
goto out;
}
range_node->range_low = entry->range_low & ~CPUID_MASK;
range_node->range_high = entry->range_high;
nova_update_range_node_checksum(range_node);
ret = nova_insert_inodetree(sbi, range_node, cpuid);
if (ret) {
nova_err(sb, "%s failed, %d\n", __func__, cpuid);
nova_free_inode_node(range_node);
NOVA_ASSERT(0);
nova_destroy_inode_trees(sb);
goto out;
}
sbi->s_inodes_used_count +=
range_node->range_high - range_node->range_low + 1;
num_inode_node++;
inode_map = &sbi->inode_maps[cpuid];
inode_map->num_range_node_inode++;
if (!inode_map->first_inode_range)
inode_map->first_inode_range = range_node;
curr_p += sizeof(struct nova_range_node_lowhigh);
}
nova_dbg("%s: %lu inode nodes\n", __func__, num_inode_node);
out:
nova_free_inode_log(sb, pi, &sih);
return ret;
}
static u64 nova_append_range_node_entry(struct super_block *sb,
struct nova_range_node *curr, u64 tail, unsigned long cpuid)
{
u64 curr_p;
size_t size = sizeof(struct nova_range_node_lowhigh);
struct nova_range_node_lowhigh *entry;
unsigned long irq_flags = 0;
curr_p = tail;
if (!nova_range_node_checksum_ok(curr)) {
nova_dbg("%s: range node checksum failure\n", __func__);
goto out;
}
if (curr_p == 0 || (is_last_entry(curr_p, size) &&
next_log_page(sb, curr_p) == 0)) {
nova_dbg("%s: inode log reaches end?\n", __func__);
goto out;
}
if (is_last_entry(curr_p, size))
curr_p = next_log_page(sb, curr_p);
entry = (struct nova_range_node_lowhigh *)nova_get_block(sb, curr_p);
nova_memunlock_range(sb, entry, size, &irq_flags);
entry->range_low = cpu_to_le64(curr->range_low);
if (cpuid)
entry->range_low |= cpu_to_le64(cpuid << 56);
entry->range_high = cpu_to_le64(curr->range_high);
nova_memlock_range(sb, entry, size, &irq_flags);
nova_dbgv("append entry block low 0x%lx, high 0x%lx\n",
curr->range_low, curr->range_high);
nova_flush_buffer(entry, sizeof(struct nova_range_node_lowhigh), 0);
out:
return curr_p;
}
static u64 nova_save_range_nodes_to_log(struct super_block *sb,
struct rb_root *tree, u64 temp_tail, unsigned long cpuid)
{
struct nova_range_node *curr;
struct rb_node *temp;
size_t size = sizeof(struct nova_range_node_lowhigh);
u64 curr_entry = 0;
/* Save in increasing order */
temp = rb_first(tree);
while (temp) {
curr = container_of(temp, struct nova_range_node, node);
curr_entry = nova_append_range_node_entry(sb, curr,
temp_tail, cpuid);
temp_tail = curr_entry + size;
temp = rb_next(temp);
rb_erase(&curr->node, tree);
nova_free_range_node(curr);
}
return temp_tail;
}
static u64 nova_save_free_list_blocknodes(struct super_block *sb, int cpu,
u64 temp_tail)
{
struct free_list *free_list;
free_list = nova_get_free_list(sb, cpu);
temp_tail = nova_save_range_nodes_to_log(sb,
&free_list->block_free_tree, temp_tail, 0);
return temp_tail;
}
void nova_save_inode_list_to_log(struct super_block *sb)
{
struct nova_inode *pi = nova_get_inode_by_ino(sb, NOVA_INODELIST_INO);
struct nova_inode_info_header sih;
struct nova_sb_info *sbi = NOVA_SB(sb);
unsigned long num_blocks;
unsigned long num_nodes = 0;
struct inode_map *inode_map;
unsigned long i;
u64 temp_tail;
u64 new_block;
int allocated;
unsigned long irq_flags = 0;
sih.ino = NOVA_INODELIST_INO;
sih.i_blk_type = NOVA_DEFAULT_BLOCK_TYPE;
sih.i_blocks = 0;
for (i = 0; i < sbi->cpus; i++) {
inode_map = &sbi->inode_maps[i];
num_nodes += inode_map->num_range_node_inode;
}
num_blocks = num_nodes / RANGENODE_PER_PAGE;
if (num_nodes % RANGENODE_PER_PAGE)
num_blocks++;
allocated = nova_allocate_inode_log_pages(sb, &sih, num_blocks,
&new_block, ANY_CPU, 0);
if (allocated != num_blocks) {
nova_dbg("Error saving inode list: %d\n", allocated);
return;
}
temp_tail = new_block;
for (i = 0; i < sbi->cpus; i++) {
inode_map = &sbi->inode_maps[i];
temp_tail = nova_save_range_nodes_to_log(sb,
&inode_map->inode_inuse_tree, temp_tail, i);
}
nova_memunlock_inode(sb, pi, &irq_flags);
pi->alter_log_head = pi->alter_log_tail = 0;
pi->log_head = new_block;
nova_update_tail(pi, temp_tail);
nova_flush_buffer(&pi->log_head, CACHELINE_SIZE, 0);
nova_memlock_inode(sb, pi, &irq_flags);
nova_dbg("%s: %lu inode nodes, pi head 0x%llx, tail 0x%llx\n",
__func__, num_nodes, pi->log_head, pi->log_tail);
}
void nova_save_blocknode_mappings_to_log(struct super_block *sb)
{
struct nova_inode *pi = nova_get_inode_by_ino(sb, NOVA_BLOCKNODE_INO);
struct nova_inode_info_header sih;
struct nova_sb_info *sbi = NOVA_SB(sb);
struct free_list *free_list;
unsigned long num_blocknode = 0;
unsigned long num_pages;
int allocated;
u64 new_block = 0;
u64 temp_tail;
int i;
unsigned long irq_flags = 0;
sih.ino = NOVA_BLOCKNODE_INO;
sih.i_blk_type = NOVA_DEFAULT_BLOCK_TYPE;
for_each_possible_cpu(i) {
struct block_allocator_per_cpu *allocator =
&per_cpu(block_allocator_per_cpu, i);
if (allocator->num != 0)
BUG_ON(nova_free_data_blocks(sb, &sih,
allocator->blocknr, allocator->num) < 0);
}
/* Allocate log pages before save blocknode mappings */
for (i = 0; i < sbi->cpus; i++) {
free_list = nova_get_free_list(sb, i);
num_blocknode += free_list->num_blocknode;
nova_dbgv("%s: free list %d: %lu nodes\n", __func__,
i, free_list->num_blocknode);
}
num_pages = num_blocknode / RANGENODE_PER_PAGE;
if (num_blocknode % RANGENODE_PER_PAGE)
num_pages++;
allocated = nova_allocate_inode_log_pages(sb, &sih, num_pages,
&new_block, ANY_CPU, 0);
if (allocated != num_pages) {
nova_dbg("Error saving blocknode mappings: %d\n", allocated);
return;
}
temp_tail = new_block;
for (i = 0; i < sbi->cpus; i++)
temp_tail = nova_save_free_list_blocknodes(sb, i, temp_tail);
/* Finally update log head and tail */
nova_memunlock_inode(sb, pi, &irq_flags);
pi->alter_log_head = pi->alter_log_tail = 0;
pi->log_head = new_block;
nova_update_tail(pi, temp_tail);
nova_flush_buffer(&pi->log_head, CACHELINE_SIZE, 0);
nova_memlock_inode(sb, pi, &irq_flags);
nova_dbg("%s: %lu blocknodes, %lu log pages, pi head 0x%llx, tail 0x%llx\n",
__func__, num_blocknode, num_pages,
pi->log_head, pi->log_tail);
}
static int nova_insert_blocknode_map(struct super_block *sb,
int cpuid, unsigned long low, unsigned long high)
{
struct free_list *free_list;
struct rb_root *tree;
struct nova_range_node *blknode = NULL;
unsigned long num_blocks = 0;
int ret;
num_blocks = high - low + 1;
nova_dbgv("%s: cpu %d, low %lu, high %lu, num %lu\n",
__func__, cpuid, low, high, num_blocks);
free_list = nova_get_free_list(sb, cpuid);
tree = &(free_list->block_free_tree);
blknode = nova_alloc_blocknode(sb);
if (blknode == NULL)
return -ENOMEM;
blknode->range_low = low;
blknode->range_high = high;
nova_update_range_node_checksum(blknode);
ret = nova_insert_blocktree(tree, blknode);
if (ret) {
nova_err(sb, "%s failed\n", __func__);
nova_free_blocknode(blknode);
goto out;
}
if (!free_list->first_node)
free_list->first_node = blknode;
free_list->last_node = blknode;
free_list->num_blocknode++;
free_list->num_free_blocks += num_blocks;
out:
return ret;
}
static int __nova_build_blocknode_map(struct super_block *sb,
unsigned long *bitmap, unsigned long bsize, unsigned long scale)
{
struct nova_sb_info *sbi = NOVA_SB(sb);
struct free_list *free_list;
unsigned long next = 0;
unsigned long low = 0;
unsigned long start, end;
int cpuid = 0;
free_list = nova_get_free_list(sb, cpuid);
start = free_list->block_start;
end = free_list->block_end + 1;
while (1) {
next = find_next_zero_bit(bitmap, end, start);
if (next == bsize)
break;
if (next == end) {
if (cpuid == sbi->cpus - 1)
break;
cpuid++;
free_list = nova_get_free_list(sb, cpuid);
start = free_list->block_start;
end = free_list->block_end + 1;
continue;
}
low = next;
next = find_next_bit(bitmap, end, next);
if (nova_insert_blocknode_map(sb, cpuid,
low << scale, (next << scale) - 1)) {
nova_dbg("Error: could not insert %lu - %lu\n",
low << scale, ((next << scale) - 1));
}
start = next;
if (next == bsize)
break;
if (next == end) {
if (cpuid == sbi->cpus - 1)
break;
cpuid++;
free_list = nova_get_free_list(sb, cpuid);
start = free_list->block_start;
end = free_list->block_end + 1;
}
}
return 0;
}
struct failure_recovery_info {
struct light_dedup_meta *light_dedup_meta;
struct scan_bitmap *global_bm;
};
static int nova_build_blocknode_map(struct super_block *sb,
struct failure_recovery_info *info)
{
struct nova_sb_info *sbi = NOVA_SB(sb);
struct nova_super_block *super = sbi->nova_sb;
unsigned long initsize = le64_to_cpu(super->s_size);
struct scan_bitmap *bm;
struct scan_bitmap *final_bm;
unsigned long *src, *dst;
int i, j;
int num;
int ret;
final_bm = kzalloc(sizeof(struct scan_bitmap), GFP_KERNEL);
if (!final_bm)
return -ENOMEM;
final_bm->bitmap_size = (initsize >> (PAGE_SHIFT + 0x3));
/* Alloc memory to hold the block alloc bitmap */
final_bm->bitmap = kvzalloc(final_bm->bitmap_size, GFP_KERNEL);
if (!final_bm->bitmap) {
kfree(final_bm);
return -ENOMEM;
}
/* Merge per-CPU bms to the final single bm */
num = final_bm->bitmap_size / sizeof(unsigned long);
if (final_bm->bitmap_size % sizeof(unsigned long))
num++;
for (i = 0; i < sbi->cpus; i++) {
bm = info->global_bm + i;
src = (unsigned long *)bm->bitmap;
dst = (unsigned long *)final_bm->bitmap;
for (j = 0; j < num; j++)
dst[j] |= src[j];
}
ret = __nova_build_blocknode_map(sb, final_bm->bitmap,
final_bm->bitmap_size * 8, PAGE_SHIFT - 12);
if (ret < 0)
goto out;
out:
kvfree(final_bm->bitmap);
kfree(final_bm);
return ret;
}
static struct scan_bitmap *
alloc_bm(struct nova_sb_info *sbi)
{
struct nova_super_block *super = sbi->nova_sb;
unsigned long initsize = le64_to_cpu(super->s_size);
struct scan_bitmap *global_bm;
struct scan_bitmap *bm;
int i, j;
global_bm = kmalloc(sbi->cpus * sizeof(struct scan_bitmap), GFP_KERNEL);
if (global_bm == NULL)
return ERR_PTR(-ENOMEM);
for (i = 0; i < sbi->cpus; i++) {
bm = global_bm + i;
bm->bitmap_size = (initsize >> (PAGE_SHIFT + 0x3));
/* Alloc memory to hold the block alloc bitmap */
bm->bitmap = kvzalloc(bm->bitmap_size, GFP_KERNEL);
if (!bm->bitmap)
break;
}
if (i != sbi->cpus) {
for (j = 0; j < i; ++j)
vfree(global_bm[j].bitmap);
kfree(global_bm);
return ERR_PTR(-ENOMEM);
}
return global_bm;
}
static inline void free_bm(struct nova_sb_info *sbi,
struct scan_bitmap *global_bm)
{
int i;
for (i = 0; i < sbi->cpus; i++)
kvfree(global_bm[i].bitmap);
kfree(global_bm);
}
static int alloc_failure_recovery_info(struct super_block *sb,
struct failure_recovery_info *info)
{
struct nova_sb_info *sbi = NOVA_SB(sb);
struct light_dedup_meta *light_dedup_meta = &sbi->light_dedup_meta;
size_t tot = 0;
int ret;
INIT_TIMING(scan_fp_entry_table_time);
info->global_bm = alloc_bm(sbi);
if (IS_ERR(info->global_bm)) {
ret = PTR_ERR(info->global_bm);
goto err_out0;
}
ret = light_dedup_meta_alloc(light_dedup_meta, sb, tot);
if (ret < 0)
goto err_out1;
info->light_dedup_meta = light_dedup_meta;
return 0;
err_out1:
free_bm(sbi, info->global_bm);
err_out0:
return ret;
}
static void free_failure_recovery_info(struct nova_sb_info *sbi, struct failure_recovery_info *info)
{
free_bm(sbi, info->global_bm);
}
static void free_all_failure_recovery_info(struct nova_sb_info *sbi, struct failure_recovery_info *info)
{
struct light_dedup_meta *meta = &sbi->light_dedup_meta;
// struct entry_allocator *allocator = &meta->entry_allocator;
free_failure_recovery_info(sbi, info);
light_dedup_meta_free(meta);
// nova_free_entry_allocator(allocator);
}
/**
* @brief update or insert GLT entry
*
* @param fp fp from the LFP entries or OFT entries
* @param blocknr the blocknr to be updated or inserted
* @param info global parameters
* @return int 0 if success, -ret if failed
*/
static int upsert_blocknr(struct nova_fp fp, unsigned long blocknr, struct failure_recovery_info *info)
{
struct light_dedup_meta *meta = info->light_dedup_meta;
struct super_block *sb = meta->sblock;
struct nova_rht_entry *pentry;
struct nova_rht_entry_pm fake_pentry;
uint64_t refcount;
unsigned long irq_flags = 0;
int ret;
fake_pentry.blocknr = blocknr;
fake_pentry.fp = fp;
fake_pentry.refcount = 1;
rcu_read_lock();
pentry = light_dedup_lookup_rht_entry(meta, &fake_pentry);
rcu_read_unlock();
if (pentry) {
refcount = atomic64_add_return(1, &pentry->refcount);
} else {
ret = light_dedup_insert_rht_entry(meta, &fake_pentry);
if (ret < 0)
return ret;
ret = light_dedup_insert_revmap_entry(meta, &fake_pentry);
if (ret < 0)
return ret;
}
return 0;
}
static int
set_bm(unsigned long blocknr, struct failure_recovery_info *info, int cpuid)
{
struct scan_bitmap *bm = info->global_bm + cpuid;
set_bit(blocknr, bm->bitmap);
// return upsert_blocknr(blocknr, info);
return 0;
}
/************************** NOVA recovery ****************************/
struct task_ring {
u64 addr0[512];
u64 addr1[512]; /* Second inode address */
int num;
int inodes_used_count;
struct xarray entry_array;
};
static struct task_ring *task_rings;
static int nova_traverse_inode_log(struct super_block *sb,
struct nova_inode *pi, u64 head,
struct failure_recovery_info *info, int cpuid)
{
u64 curr_p;
u64 next;
int ret;
curr_p = head;
if (curr_p == 0)
return 0;
BUG_ON(curr_p & (PAGE_SIZE - 1));
ret = set_bm(curr_p >> PAGE_SHIFT, info, cpuid);
if (ret < 0)
return ret;
next = next_log_page(sb, curr_p);
while (next > 0) {
curr_p = next;
BUG_ON(curr_p & (PAGE_SIZE - 1));
ret = set_bm(curr_p >> PAGE_SHIFT, info, cpuid);
if (ret < 0)
return ret;
next = next_log_page(sb, curr_p);
}
return 0;
}
static int nova_traverse_dir_inode_log(struct super_block *sb,
struct nova_inode *pi, struct failure_recovery_info *info, int cpuid)
{
int ret = nova_traverse_inode_log(sb, pi, pi->log_head, info, cpuid);
if (ret < 0)
return ret;
if (metadata_csum) {
ret = nova_traverse_inode_log(sb, pi, pi->alter_log_head, info, cpuid);
if (ret < 0)
return ret;
}
return 0;
}
/*
* retval > 0: Deletable?
* retval == 0: Not deletable?
* retval < 0: Error code.
*/
static int nova_check_old_entry(struct super_block *sb,
struct nova_inode_info_header *sih, struct nova_file_write_entry *entry,
unsigned long pgoff, unsigned int num_free,
u64 epoch_id,
struct failure_recovery_info *info, int cpuid)
{
struct nova_file_write_entry *entryc, entry_copy;
unsigned long old_nvmm;
int i;
int ret;
if (!entry)
return 0;
if (metadata_csum == 0)
entryc = entry;
else {
entryc = &entry_copy;
if (!nova_verify_entry_csum(sb, entry, entryc))
return 0;
}
old_nvmm = get_nvmm(sb, sih, entryc, pgoff);
ret = nova_append_data_to_snapshot(sb, entryc, old_nvmm,
num_free, epoch_id);
if (ret != 0)
return ret;
for (i = 0; i < num_free; i++) {
ret = set_bm(old_nvmm, info, cpuid);
if (ret < 0)
return ret;
old_nvmm += 1;
}
return 0;
}
static int nova_set_ring_array(struct super_block *sb,
struct nova_inode_info_header *sih, struct nova_file_write_entry *entry,
struct nova_file_write_entry *entryc, struct task_ring *ring,
struct failure_recovery_info *info, int cpuid)
{
unsigned long start, end;
unsigned long pgoff, old_pgoff = 0;
unsigned int num_free = 0;
struct nova_file_write_entry *old_entry = NULL, *cur_entry;
u64 epoch_id = entryc->epoch_id;
void *xa_ret;
int ret;
start = entryc->pgoff;
end = entryc->pgoff + entryc->num_pages;
for (pgoff = start; pgoff < end; pgoff++) {
xa_ret = xa_store(&ring->entry_array, pgoff, xa_tag_pointer(entry, 0), GFP_KERNEL);
if (xa_is_err(xa_ret))
return xa_err(xa_ret);
cur_entry = xa_untag_pointer(xa_ret);
if (cur_entry != old_entry) {
if (old_entry) {
ret = nova_check_old_entry(sb, sih, old_entry,
old_pgoff, num_free,
epoch_id, info, cpuid);
if (ret < 0)
return ret;
}
old_entry = cur_entry;
old_pgoff = pgoff;
num_free = 1;
} else {
num_free++;
}
}
if (old_entry) {
ret = nova_check_old_entry(sb, sih, old_entry, old_pgoff,
num_free, epoch_id, info, cpuid);
if (ret < 0)
return ret;
}
return 0;
}
static int nova_set_file_bm(struct super_block *sb,
struct nova_inode_info_header *sih, struct task_ring *ring,
struct failure_recovery_info *info, int cpuid,
unsigned long last_blocknr)
{
struct light_dedup_meta *meta = info->light_dedup_meta;
struct nova_file_write_entry *entry;
struct nova_fp *extent_table = nova_sbi_blocknr_to_addr(NOVA_SB(sb),
NOVA_SB(sb)->extent_table);
struct nova_fp fp = {0};
unsigned long nvmm, pgoff, i;
int ret;
for (pgoff = 0; pgoff <= last_blocknr; pgoff++) {
entry = xa_untag_pointer(xa_erase(&ring->entry_array, pgoff));
if (entry) {
nvmm = get_nvmm(sb, sih, entry, pgoff);
ret = set_bm(nvmm, info, cpuid);
if (ret < 0)
return ret;
if (entry->num_pages > 1) {
// check extent table
for (i = nvmm; i < nvmm + entry->num_pages; i++) {
fp = extent_table[i];
BUG_ON(fp.value == 0);
upsert_blocknr(fp, i, info);
}
} else {
// in case this is a collisioned block
if (entry->fp.value != 0)
upsert_blocknr(entry->fp, nvmm, info);
else
nova_warn("collisioned entry found, skip...\n");
}
}
}
return 0;
}