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super.c
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/*
* BRIEF DESCRIPTION
*
* Super block operations.
*
* 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
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/module.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/parser.h>
#include <linux/vfs.h>
#include <linux/uaccess.h>
#include <linux/io.h>
#include <linux/seq_file.h>
#include <linux/mount.h>
#include <uapi/linux/mount.h>
#include <linux/mm.h>
#include <linux/ctype.h>
#include <linux/bitops.h>
#include <linux/magic.h>
#include <linux/exportfs.h>
#include <linux/random.h>
#include <linux/cred.h>
#include <linux/list.h>
#include <linux/dax.h>
#include "config.h"
#include "nova.h"
#include "journal.h"
#include "super.h"
#include "inode.h"
#include "table.h"
#include "arithmetic.h"
int measure_timing;
int metadata_csum;
int wprotect;
int data_csum;
int data_parity;
int dram_struct_csum;
int support_clwb;
int transition_threshold = 6;
module_param(measure_timing, int, 0444);
MODULE_PARM_DESC(measure_timing, "Timing measurement");
module_param(metadata_csum, int, 0444);
MODULE_PARM_DESC(metadata_csum, "Protect metadata structures with replication and checksums");
module_param(wprotect, int, 0444);
MODULE_PARM_DESC(wprotect, "Write-protect pmem region and use CR0.WP to allow updates");
module_param(data_csum, int, 0444);
MODULE_PARM_DESC(data_csum, "Detect corruption of data pages using checksum");
module_param(data_parity, int, 0444);
MODULE_PARM_DESC(data_parity, "Protect file data using RAID-5 style parity.");
module_param(dram_struct_csum, int, 0444);
MODULE_PARM_DESC(dram_struct_csum, "Protect key DRAM data structures with checksums");
module_param(nova_dbgmask, int, 0444);
MODULE_PARM_DESC(nova_dbgmask, "Control debugging output");
module_param(transition_threshold, int, 0444);
MODULE_PARM_DESC(transition_threshold, "If the number of threads that access "
"NVM concurrently reaches transition_threshold, then prefetch-next "
"will be disabled. Default: 6");
static struct super_operations nova_sops;
static const struct export_operations nova_export_ops;
static struct kmem_cache *nova_inode_cachep;
static struct kmem_cache *nova_range_node_cachep;
static struct kmem_cache *nova_snapshot_info_cachep;
/* FIXME: should the following variable be one per NOVA instance? */
unsigned int nova_dbgmask;
void nova_error_mng(struct super_block *sb, const char *fmt, ...)
{
va_list args;
printk(KERN_CRIT "nova error: ");
va_start(args, fmt);
vprintk(fmt, args);
va_end(args);
if (test_opt(sb, ERRORS_PANIC))
panic("nova: panic from previous error\n");
if (test_opt(sb, ERRORS_RO)) {
printk(KERN_CRIT "nova err: remounting filesystem read-only");
sb->s_flags |= MS_RDONLY;
}
}
static void nova_set_blocksize(struct super_block *sb, unsigned long size)
{
int bits;
/*
* We've already validated the user input and the value here must be
* between NOVA_MAX_BLOCK_SIZE and NOVA_MIN_BLOCK_SIZE
* and it must be a power of 2.
*/
bits = fls(size) - 1;
sb->s_blocksize_bits = bits;
sb->s_blocksize = (1 << bits);
}
static int nova_get_nvmm_info(struct super_block *sb,
struct nova_sb_info *sbi)
{
void *virt_addr = NULL;
pfn_t __pfn_t;
long size;
struct dax_device *dax_dev;
int ret;
ret = bdev_dax_supported(sb->s_bdev, PAGE_SIZE);
nova_dbg_verbose("%s: dax_supported = %d; bdev->super=0x%p",
__func__, ret, sb->s_bdev->bd_super);
if (!ret) {
nova_err(sb, "device does not support DAX\n");
return -EINVAL;
}
sbi->s_bdev = sb->s_bdev;
dax_dev = fs_dax_get_by_host(sb->s_bdev->bd_disk->disk_name);
if (!dax_dev) {
nova_err(sb, "Couldn't retrieve DAX device.\n");
return -EINVAL;
}
sbi->s_dax_dev = dax_dev;
size = dax_direct_access(sbi->s_dax_dev, 0, LONG_MAX/PAGE_SIZE,
&virt_addr, &__pfn_t) * PAGE_SIZE;
if (size <= 0) {
nova_err(sb, "direct_access failed\n");
return -EINVAL;
}
sbi->virt_addr = virt_addr;
if (!sbi->virt_addr) {
nova_err(sb, "ioremap of the nova image failed(1)\n");
return -EINVAL;
}
sbi->phys_addr = pfn_t_to_pfn(__pfn_t) << PAGE_SHIFT;
sbi->initsize = size;
sbi->num_blocks = ((unsigned long)(size) >> PAGE_SHIFT);
sbi->block_start = HEAD_RESERVED_BLOCKS;
sbi->replica_sb_addr = virt_addr + size - PAGE_SIZE;
sbi->replica_reserved_inodes_addr = (char *)sbi->replica_sb_addr - PAGE_SIZE;
sbi->block_end = sbi->num_blocks - 2;
sbi->fp2pbn_table = sbi->block_start;
sbi->block_start += ((sbi->num_blocks * sizeof(struct nova_rht_entry_pm) - 1) >> PAGE_SHIFT) + 1;
sbi->extent_table = sbi->block_start;
sbi->block_start += ((sbi->num_blocks * sizeof(struct nova_fp) - 1) >> PAGE_SHIFT) + 1;
// sbi->region_start = sbi->block_start;
// sbi->block_start += VALID_ENTRY_COUNTER_PER_BLOCK;
nova_dbg("%s: dev %s, phys_addr 0x%llx, virt_addr 0x%lx, size %ld, "
"num_blocks %lu, block_start %lu, block_end %lu\n",
__func__, sbi->s_bdev->bd_disk->disk_name,
sbi->phys_addr, (unsigned long)sbi->virt_addr, sbi->initsize,
sbi->num_blocks, sbi->block_start, sbi->block_end);
return 0;
}
static loff_t nova_max_size(int bits)
{
loff_t res;
res = (1ULL << 63) - 1;
if (res > MAX_LFS_FILESIZE)
res = MAX_LFS_FILESIZE;
nova_dbg_verbose("max file size %llu bytes\n", res);
return res;
}
enum {
Opt_bpi, Opt_init, Opt_snapshot, Opt_mode, Opt_uid,
Opt_gid, Opt_dax, Opt_data_cow, Opt_wprotect,
Opt_err_cont, Opt_err_panic, Opt_err_ro,
Opt_dbgmask, Opt_err
};
static const match_table_t tokens = {
{ Opt_bpi, "bpi=%u" },
{ Opt_init, "init" },
{ Opt_snapshot, "snapshot=%u" },
{ Opt_mode, "mode=%o" },
{ Opt_uid, "uid=%u" },
{ Opt_gid, "gid=%u" },
{ Opt_dax, "dax" },
{ Opt_data_cow, "data_cow" },
{ Opt_wprotect, "wprotect" },
{ Opt_err_cont, "errors=continue" },
{ Opt_err_panic, "errors=panic" },
{ Opt_err_ro, "errors=remount-ro" },
{ Opt_dbgmask, "dbgmask=%u" },
{ Opt_err, NULL },
};
static int nova_parse_options(char *options, struct nova_sb_info *sbi,
bool remount)
{
char *p;
substring_t args[MAX_OPT_ARGS];
int option;
kuid_t uid;
if (!options)
return 0;
while ((p = strsep(&options, ",")) != NULL) {
int token;
if (!*p)
continue;
token = match_token(p, tokens, args);
switch (token) {
case Opt_bpi:
if (match_int(&args[0], &option))
goto bad_val;
if (remount && sbi->bpi)
goto bad_opt;
sbi->bpi = option;
break;
case Opt_uid:
if (match_int(&args[0], &option))
goto bad_val;
uid = make_kuid(current_user_ns(), option);
if (remount && !uid_eq(sbi->uid, uid))
goto bad_opt;
sbi->uid = uid;
break;
case Opt_gid:
if (match_int(&args[0], &option))
goto bad_val;
sbi->gid = make_kgid(current_user_ns(), option);
break;
case Opt_mode:
if (match_octal(&args[0], &option))
goto bad_val;
sbi->mode = option & 01777U;
break;
case Opt_init:
if (remount)
goto bad_opt;
set_opt(sbi->s_mount_opt, FORMAT);
break;
case Opt_snapshot:
if (match_int(&args[0], &option))
goto bad_val;
sbi->mount_snapshot = 1;
sbi->mount_snapshot_epoch_id = option;
break;
case Opt_err_panic:
clear_opt(sbi->s_mount_opt, ERRORS_CONT);
clear_opt(sbi->s_mount_opt, ERRORS_RO);
set_opt(sbi->s_mount_opt, ERRORS_PANIC);
break;
case Opt_err_ro:
clear_opt(sbi->s_mount_opt, ERRORS_CONT);
clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
set_opt(sbi->s_mount_opt, ERRORS_RO);
break;
case Opt_err_cont:
clear_opt(sbi->s_mount_opt, ERRORS_RO);
clear_opt(sbi->s_mount_opt, ERRORS_PANIC);
set_opt(sbi->s_mount_opt, ERRORS_CONT);
break;
case Opt_dax:
set_opt(sbi->s_mount_opt, DAX);
break;
case Opt_data_cow:
set_opt(sbi->s_mount_opt, DATA_COW);
nova_info("Enable copy-on-write updates\n");
break;
case Opt_wprotect:
if (remount)
goto bad_opt;
set_opt(sbi->s_mount_opt, PROTECT);
nova_info("NOVA: Enabling new Write Protection (CR0.WP)\n");
break;
case Opt_dbgmask:
if (match_int(&args[0], &option))
goto bad_val;
nova_dbgmask = option;
break;
default: {
goto bad_opt;
}
}
}
return 0;
bad_val:
nova_info("Bad value '%s' for mount option '%s'\n", args[0].from,
p);
return -EINVAL;
bad_opt:
nova_info("Bad mount option: \"%s\"\n", p);
return -EINVAL;
}
/* Make sure we have enough space */
static bool nova_check_size(struct super_block *sb, unsigned long size)
{
struct nova_sb_info *sbi = NOVA_SB(sb);
return sbi->block_start < sbi->block_end;
}
static inline int nova_check_super_checksum(struct super_block *sb)
{
struct nova_sb_info *sbi = NOVA_SB(sb);
u32 crc = 0;
// Check CRC but skip c_sum, which is the 4 bytes at the beginning
crc = nova_crc32c(~0, (__u8 *)sbi->nova_sb + sizeof(__le32),
sizeof(struct nova_super_block) - sizeof(__le32));
if (sbi->nova_sb->s_sum == cpu_to_le32(crc))
return 0;
else
return 1;
}
inline void nova_sync_super(struct super_block *sb)
{
struct nova_sb_info *sbi = NOVA_SB(sb);
struct nova_super_block *super = nova_get_super(sb);
struct nova_super_block *super_redund;
unsigned long irq_flags = 0;
nova_memunlock_super(sb, &irq_flags);
super_redund = nova_get_redund_super(sb);
memcpy_to_pmem_nocache((void *)super, (void *)sbi->nova_sb,
sizeof(struct nova_super_block));
PERSISTENT_BARRIER();
memcpy_to_pmem_nocache((void *)super_redund, (void *)sbi->nova_sb,
sizeof(struct nova_super_block));
PERSISTENT_BARRIER();
nova_memlock_super(sb, &irq_flags);
}
/* Update checksum for the DRAM copy */
inline void nova_update_super_crc(struct super_block *sb)
{
struct nova_sb_info *sbi = NOVA_SB(sb);
u32 crc = 0;
sbi->nova_sb->s_wtime = cpu_to_le32(get_seconds());
sbi->nova_sb->s_sum = 0;
crc = nova_crc32c(~0, (__u8 *)sbi->nova_sb + sizeof(__le32),
sizeof(struct nova_super_block) - sizeof(__le32));
sbi->nova_sb->s_sum = cpu_to_le32(crc);
}
static inline void nova_update_mount_time(struct super_block *sb)
{
struct nova_sb_info *sbi = NOVA_SB(sb);
u64 mnt_write_time;
mnt_write_time = (get_seconds() & 0xFFFFFFFF);
mnt_write_time = mnt_write_time | (mnt_write_time << 32);
sbi->nova_sb->s_mtime = cpu_to_le64(mnt_write_time);
nova_update_super_crc(sb);
nova_sync_super(sb);
}
// static void init_regions(struct nova_sb_info *sbi)
// {
// int i;
// size_t offset = nova_get_blocknr_off(sbi->region_start) + PAGE_SIZE;
// __le64 *p = nova_sbi_get_block(sbi, offset - sizeof(__le64));
// memset_nt(
// nova_sbi_blocknr_to_addr(sbi, sbi->region_start),
// 0,
// VALID_ENTRY_COUNTER_PER_BLOCK * PAGE_SIZE
// );
// for (i = 1; i < VALID_ENTRY_COUNTER_PER_BLOCK; ++i) {
// *p = cpu_to_le64(offset);
// p += PAGE_SIZE / sizeof(__le64);
// offset += PAGE_SIZE;
// }
// // *p = 0;
// p = nova_sbi_blocknr_to_addr(sbi, sbi->region_blocknr_start);
// for (i = 0; i < VALID_ENTRY_COUNTER_PER_BLOCK; ++i)
// p[i] = cpu_to_le64(sbi->region_start + i);
// }
static struct nova_inode *nova_init(struct super_block *sb,
unsigned long size)
{
unsigned long blocksize;
struct nova_inode *root_i, *pi;
struct nova_super_block *super;
struct nova_sb_info *sbi = NOVA_SB(sb);
struct nova_inode_update update;
u64 epoch_id;
unsigned long irq_flags = 0;
int ret;
INIT_TIMING(init_time);
NOVA_START_TIMING(new_init_t, init_time);
nova_info("creating an empty nova of size %lu\n", size);
nova_dbgv("nova: Default block size set to 4K\n");
sbi->blocksize = blocksize = NOVA_DEF_BLOCK_SIZE_4K;
nova_set_blocksize(sb, sbi->blocksize);
if (!nova_check_size(sb, size)) {
nova_warn("Specified NOVA size too small 0x%lx.\n", size);
return ERR_PTR(-EINVAL);
}
nova_dbgv("max file name len %d\n", (unsigned int)NOVA_NAME_LEN);
super = nova_get_super(sb);
nova_memunlock_reserved(sb, super, &irq_flags);
/* clear out super-block and inode table */
memset_nt(super, 0, sbi->block_start * sbi->blocksize);
pi = nova_get_inode_by_ino(sb, NOVA_BLOCKNODE_INO);
pi->nova_ino = NOVA_BLOCKNODE_INO;
nova_flush_buffer(pi, CACHELINE_SIZE, 1);
pi = nova_get_inode_by_ino(sb, NOVA_SNAPSHOT_INO);
pi->nova_ino = NOVA_SNAPSHOT_INO;
nova_flush_buffer(pi, CACHELINE_SIZE, 1);
memset(&update, 0, sizeof(struct nova_inode_update));
nova_update_inode(sb, &sbi->snapshot_si->vfs_inode, pi, &update, 1);
nova_memlock_reserved(sb, super, &irq_flags);
nova_init_blockmap(sb, 0);
if (nova_lite_journal_hard_init(sb) < 0) {
nova_err(sb, "Lite journal hard initialization failed\n");
return ERR_PTR(-EINVAL);
}
if (nova_init_inode_inuse_list(sb) < 0)
return ERR_PTR(-EINVAL);
if (nova_init_inode_table(sb) < 0)
return ERR_PTR(-EINVAL);
sbi->nova_sb->s_size = cpu_to_le64(size);
sbi->nova_sb->s_blocksize = cpu_to_le32(blocksize);
sbi->nova_sb->s_magic = cpu_to_le32(NOVA_SUPER_MAGIC);
sbi->nova_sb->s_epoch_id = 0;
sbi->nova_sb->s_metadata_csum = metadata_csum;
sbi->nova_sb->s_data_csum = data_csum;
sbi->nova_sb->s_data_parity = data_parity;
nova_update_super_crc(sb);
nova_sync_super(sb);
root_i = nova_get_inode_by_ino(sb, NOVA_ROOT_INO);
nova_dbgv("%s: Allocate root inode @ 0x%p\n", __func__, root_i);
nova_memunlock_inode(sb, root_i, &irq_flags);
root_i->i_mode = cpu_to_le16(sbi->mode | S_IFDIR);
root_i->i_uid = cpu_to_le32(from_kuid(&init_user_ns, sbi->uid));
root_i->i_gid = cpu_to_le32(from_kgid(&init_user_ns, sbi->gid));
root_i->i_links_count = cpu_to_le16(2);
root_i->i_blk_type = NOVA_BLOCK_TYPE_4K;
root_i->i_flags = 0;
root_i->i_size = cpu_to_le64(sb->s_blocksize);
root_i->i_atime = root_i->i_mtime = root_i->i_ctime =
cpu_to_le32(get_seconds());
root_i->nova_ino = cpu_to_le64(NOVA_ROOT_INO);
root_i->valid = 1;
/* nova_sync_inode(root_i); */
nova_flush_buffer(root_i, sizeof(*root_i), false);
nova_memlock_inode(sb, root_i, &irq_flags);
epoch_id = nova_get_epoch_id(sb);
nova_append_dir_init_entries(sb, root_i, NOVA_ROOT_INO,
NOVA_ROOT_INO, epoch_id);
// nova_memunlock(sbi, &irq_flags); // TODO
// init_regions(sbi);
// memset_nt(
// nova_sbi_blocknr_to_addr(sbi,
// sbi->first_counter_block_start),
// 0,
// PAGE_SIZE
// );
// nova_memlock(sbi, &irq_flags);
PERSISTENT_MARK();
PERSISTENT_BARRIER();
ret = light_dedup_meta_init(&sbi->light_dedup_meta, sb);
if (ret < 0)
return ERR_PTR(ret);
NOVA_END_TIMING(new_init_t, init_time);
nova_info("NOVA initialization finish\n");
return root_i;
}
static inline void set_default_opts(struct nova_sb_info *sbi)
{
set_opt(sbi->s_mount_opt, HUGEIOREMAP);
set_opt(sbi->s_mount_opt, ERRORS_CONT);
sbi->cpus = num_online_cpus();
nova_info("%d cpus online\n", sbi->cpus);
sbi->map_id = 0;
sbi->snapshot_si = NULL;
}
static void nova_root_check(struct super_block *sb, struct nova_inode *root_pi)
{
if (!S_ISDIR(le16_to_cpu(root_pi->i_mode)))
nova_warn("root is not a directory!\n");
}
/* Check super block magic and checksum */
static int nova_check_super(struct super_block *sb,
struct nova_super_block *ps)
{
struct nova_sb_info *sbi = NOVA_SB(sb);
int rc;
rc = memcpy_mcsafe(sbi->nova_sb, ps,
sizeof(struct nova_super_block));
if (rc < 0)
return rc;
if (le32_to_cpu(sbi->nova_sb->s_magic) != NOVA_SUPER_MAGIC)
return -EIO;
if (nova_check_super_checksum(sb))
return -EIO;
return 0;
}
/* Check if we disable protection previously and enable it now */
/* FIXME */
static int nova_check_module_params(struct super_block *sb)
{
struct nova_sb_info *sbi = NOVA_SB(sb);
if (sbi->nova_sb->s_metadata_csum != metadata_csum) {
nova_dbg("%s metadata checksum\n",
sbi->nova_sb->s_metadata_csum ? "Enable" : "Disable");
metadata_csum = sbi->nova_sb->s_metadata_csum;
}
if (sbi->nova_sb->s_data_csum != data_csum) {
nova_dbg("%s data checksum\n",
sbi->nova_sb->s_data_csum ? "Enable" : "Disable");
data_csum = sbi->nova_sb->s_data_csum;
}
if (sbi->nova_sb->s_data_parity != data_parity) {
nova_dbg("%s data parity\n",
sbi->nova_sb->s_data_parity ? "Enable" : "Disable");
data_parity = sbi->nova_sb->s_data_parity;
}
return 0;
}
static int nova_check_integrity(struct super_block *sb)
{
struct nova_super_block *super = nova_get_super(sb);
struct nova_super_block *super_redund;
int rc;
super_redund = nova_get_redund_super(sb);
/* Do sanity checks on the superblock */
rc = nova_check_super(sb, super);
if (rc < 0) {
rc = nova_check_super(sb, super_redund);
if (rc < 0) {
nova_err(sb, "Can't find a valid nova partition\n");
return rc;
} else
nova_warn("Error in super block: try to repair it with the other copy\n");
}
nova_sync_super(sb);
nova_check_module_params(sb);
return 0;
}
static int nova_fill_super(struct super_block *sb, void *data, int silent)
{
struct nova_inode *root_pi;
struct nova_sb_info *sbi = NULL;
struct inode *root_i = NULL;
struct inode_map *inode_map;
unsigned long blocksize;
size_t strp_size = NOVA_STRIPE_SIZE;
u32 random = 0;
int retval = -EINVAL;
int i;
INIT_TIMING(mount_time);
NOVA_START_TIMING(mount_t, mount_time);
BUILD_BUG_ON(sizeof(struct nova_super_block) > NOVA_SB_SIZE);
BUILD_BUG_ON(sizeof(struct nova_inode) > NOVA_INODE_SIZE);
BUILD_BUG_ON(sizeof(struct nova_inode_log_page) != PAGE_SIZE);
BUILD_BUG_ON(sizeof(struct journal_ptr_pair) > CACHELINE_SIZE);
BUILD_BUG_ON(PAGE_SIZE/sizeof(struct nova_lite_journal_entry) <
NOVA_MAX_JOURNAL_LENGTH);
BUILD_BUG_ON(sizeof(struct nova_inode_page_tail) +
LOG_BLOCK_TAIL != PAGE_SIZE);
sbi = kzalloc(sizeof(struct nova_sb_info), GFP_KERNEL);
if (!sbi)
return -ENOMEM;
sbi->nova_sb = kzalloc(sizeof(struct nova_super_block), GFP_KERNEL);
if (!sbi->nova_sb) {
kfree(sbi);
return -ENOMEM;
}
sb->s_fs_info = sbi;
sbi->sb = sb;
set_default_opts(sbi);
/* Currently the log page supports 64 journal pointer pairs */
retval = nova_get_nvmm_info(sb, sbi);
if (retval) {
nova_err(sb, "%s: Failed to get nvmm info.",
__func__);
goto out;
}
nova_dbg("measure timing %d, metadata checksum %d, wprotect %d, data checksum %d, data parity %d, DRAM checksum %d\n",
measure_timing, metadata_csum,
wprotect, data_csum,
data_parity, dram_struct_csum);
get_random_bytes(&random, sizeof(u32));
atomic_set(&sbi->next_generation, random);
/* Init with default values */
sbi->mode = (0755);
sbi->uid = current_fsuid();
sbi->gid = current_fsgid();
set_opt(sbi->s_mount_opt, HUGEIOREMAP);
mutex_init(&sbi->vma_mutex);
INIT_LIST_HEAD(&sbi->mmap_sih_list);
sbi->inode_maps = kcalloc(sbi->cpus, sizeof(struct inode_map),
GFP_KERNEL);
if (!sbi->inode_maps) {
retval = -ENOMEM;
nova_dbg("%s: Allocating inode maps failed.",
__func__);
goto out;
}
for (i = 0; i < sbi->cpus; i++) {
inode_map = &sbi->inode_maps[i];
mutex_init(&inode_map->inode_table_mutex);
inode_map->inode_inuse_tree = RB_ROOT;
}
mutex_init(&sbi->s_lock);
sbi->zeroed_page = kzalloc(PAGE_SIZE, GFP_KERNEL);
if (!sbi->zeroed_page) {
retval = -ENOMEM;
nova_dbg("%s: sbi->zeroed_page failed.",
__func__);
goto out;
}
for (i = 0; i < 8; i++)
sbi->zero_csum[i] = nova_crc32c(NOVA_INIT_CSUM,
sbi->zeroed_page, strp_size);
sbi->zero_parity = kzalloc(strp_size, GFP_KERNEL);
if (!sbi->zero_parity) {
retval = -ENOMEM;
nova_err(sb, "%s: sbi->zero_parity failed.",
__func__);
goto out;
}
sbi->snapshot_si = kmem_cache_alloc(nova_inode_cachep, GFP_NOFS);
nova_snapshot_init(sb);
retval = nova_parse_options(data, sbi, 0);
if (retval) {
nova_err(sb, "%s: Failed to parse nova command line options.",
__func__);
goto out;
}
if (sbi->mount_snapshot) {
sb->s_flags |= MS_RDONLY;
nova_info("Snapshot: mount NOVA read-only\n");
}
if (nova_alloc_block_free_lists(sb)) {
retval = -ENOMEM;
nova_err(sb, "%s: Failed to allocate block free lists.",
__func__);
goto out;
}
nova_sysfs_init(sb);
/* Init a new nova instance */
if (sbi->s_mount_opt & NOVA_MOUNT_FORMAT) {
root_pi = nova_init(sb, sbi->initsize);
retval = -ENOMEM;
if (IS_ERR(root_pi)) {
nova_err(sb, "%s: root_pi error.",
__func__);
goto out;
}
goto setup_sb;
}
nova_dbg_verbose("checking physical address 0x%016llx for nova image\n",
(u64)sbi->phys_addr);
if (nova_check_integrity(sb) < 0) {
retval = -EINVAL;
nova_dbg("Memory contains invalid nova %x:%x\n",
le32_to_cpu(sbi->nova_sb->s_magic), NOVA_SUPER_MAGIC);
goto out;
}
if (nova_lite_journal_soft_init(sb)) {
retval = -EINVAL;
nova_err(sb, "Lite journal initialization failed\n");
goto out;
}
if (sbi->mount_snapshot) {
retval = nova_mount_snapshot(sb);
if (retval) {
nova_err(sb, "Mount snapshot failed\n");
goto out;
}
}
blocksize = le32_to_cpu(sbi->nova_sb->s_blocksize);
nova_set_blocksize(sb, blocksize);
nova_dbg_verbose("blocksize %lu\n", blocksize);
/* Read the root inode */
root_pi = nova_get_inode_by_ino(sb, NOVA_ROOT_INO);
/* Check that the root inode is in a sane state */
nova_root_check(sb, root_pi);
/* Set it all up.. */
setup_sb:
sb->s_magic = le32_to_cpu(sbi->nova_sb->s_magic);
sb->s_op = &nova_sops;
sb->s_maxbytes = nova_max_size(sb->s_blocksize_bits);
sb->s_time_gran = 1000000000; // 1 second.
sb->s_export_op = &nova_export_ops;
sb->s_xattr = NULL;
sb->s_flags |= MS_NOSEC;
/* If the FS was not formatted on this mount, scan the meta-data after
* truncate list has been processed
*/
if ((sbi->s_mount_opt & NOVA_MOUNT_FORMAT) == 0) {
retval = nova_recovery(sb);
if (retval < 0) {
nova_err(sb, "%s: nova recovery failed with return code %d\n",
__func__, retval);
goto out;
}
}
root_i = nova_iget(sb, NOVA_ROOT_INO);
if (IS_ERR(root_i)) {
retval = PTR_ERR(root_i);
nova_err(sb, "%s: failed to get root inode",
__func__);
goto out;
}
sb->s_root = d_make_root(root_i);
if (!sb->s_root) {
nova_err(sb, "get nova root inode failed\n");
retval = -ENOMEM;
goto out;
}
if (!(sb->s_flags & MS_RDONLY))
nova_update_mount_time(sb);
nova_print_curr_epoch_id(sb);
retval = 0;
NOVA_END_TIMING(mount_t, mount_time);
return retval;
out:
if (sbi->snapshot_si) {
kmem_cache_free(nova_inode_cachep, sbi->snapshot_si);
sbi->snapshot_si = NULL;
}
kfree(sbi->zeroed_page);
sbi->zeroed_page = NULL;
kfree(sbi->zero_parity);
sbi->zero_parity = NULL;
kfree(sbi->free_lists);
sbi->free_lists = NULL;
kfree(sbi->journal_locks);
sbi->journal_locks = NULL;
kfree(sbi->inode_maps);
sbi->inode_maps = NULL;
nova_sysfs_exit(sb);
// TODO: Free meta_table here.
kfree(sbi->nova_sb);
kfree(sbi);
nova_dbg("%s failed: return %d\n", __func__, retval);
return retval;
}
int nova_statfs(struct dentry *d, struct kstatfs *buf)
{
struct super_block *sb = d->d_sb;
struct nova_sb_info *sbi = (struct nova_sb_info *)sb->s_fs_info;
buf->f_type = NOVA_SUPER_MAGIC;
buf->f_bsize = sb->s_blocksize;
buf->f_blocks = sbi->num_blocks;
buf->f_bfree = buf->f_bavail = nova_count_free_blocks(sb);
buf->f_files = LONG_MAX;
buf->f_ffree = LONG_MAX - sbi->s_inodes_used_count;
buf->f_namelen = NOVA_NAME_LEN;
nova_dbg_verbose("nova_stats: total 4k free blocks 0x%llx\n",
buf->f_bfree);
return 0;
}
static int nova_show_options(struct seq_file *seq, struct dentry *root)
{
struct nova_sb_info *sbi = NOVA_SB(root->d_sb);
//seq_printf(seq, ",physaddr=0x%016llx", (u64)sbi->phys_addr);
//if (sbi->initsize)
// seq_printf(seq, ",init=%luk", sbi->initsize >> 10);
//if (sbi->blocksize)
// seq_printf(seq, ",bs=%lu", sbi->blocksize);
//if (sbi->bpi)
// seq_printf(seq, ",bpi=%lu", sbi->bpi);
if (sbi->mode != (0777 | S_ISVTX))
seq_printf(seq, ",mode=%03o", sbi->mode);
if (uid_valid(sbi->uid))
seq_printf(seq, ",uid=%u", from_kuid(&init_user_ns, sbi->uid));
if (gid_valid(sbi->gid))
seq_printf(seq, ",gid=%u", from_kgid(&init_user_ns, sbi->gid));
if (test_opt(root->d_sb, ERRORS_RO))
seq_puts(seq, ",errors=remount-ro");
if (test_opt(root->d_sb, ERRORS_PANIC))
seq_puts(seq, ",errors=panic");
/* memory protection disabled by default */
if (test_opt(root->d_sb, PROTECT))
seq_puts(seq, ",wprotect");
if (test_opt(root->d_sb, DAX))
seq_puts(seq, ",dax");
return 0;
}
int nova_remount(struct super_block *sb, int *mntflags, char *data)
{
unsigned long old_sb_flags;
unsigned long old_mount_opt;
struct nova_sb_info *sbi = NOVA_SB(sb);
int ret = -EINVAL;
/* Store the old options */
mutex_lock(&sbi->s_lock);
old_sb_flags = sb->s_flags;
old_mount_opt = sbi->s_mount_opt;
if (nova_parse_options(data, sbi, 1))
goto restore_opt;
sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
((sbi->s_mount_opt & NOVA_MOUNT_POSIX_ACL) ?
MS_POSIXACL : 0);
if ((*mntflags & MS_RDONLY) != (sb->s_flags & MS_RDONLY))
nova_update_mount_time(sb);
mutex_unlock(&sbi->s_lock);
ret = 0;
return ret;
restore_opt:
sb->s_flags = old_sb_flags;
sbi->s_mount_opt = old_mount_opt;
mutex_unlock(&sbi->s_lock);
return ret;
}
static void nova_put_super(struct super_block *sb)
{
struct nova_sb_info *sbi = NOVA_SB(sb);
struct inode_map *inode_map;
int i;
nova_print_curr_epoch_id(sb);
// Do not save anymore
light_dedup_meta_save(&sbi->light_dedup_meta);
/* It's unmount time, so unmap the nova memory */
// nova_print_free_lists(sb);
nova_print_timing_stats(sb);
if (sbi->virt_addr) {
nova_save_snapshots(sb);
kmem_cache_free(nova_inode_cachep, sbi->snapshot_si);
nova_save_inode_list_to_log(sb);
/* Save everything before blocknode mapping! */
nova_save_blocknode_mappings_to_log(sb);
sbi->virt_addr = NULL;
}
nova_delete_free_lists(sb);
kfree(sbi->zeroed_page);
kfree(sbi->zero_parity);
nova_dbgmask = 0;
kfree(sbi->journal_locks);
for (i = 0; i < sbi->cpus; i++) {