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    Subject[PATCH v5 06/10] lib: sysctl handling (kernel glue code)
    Date
    This interacts with fs/proc_fs.c for sysctl-like interface registered via
    lib_init() API.

    Signed-off-by: Hajime Tazaki <tazaki@sfc.wide.ad.jp>
    ---
    arch/lib/sysctl.c | 270 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
    1 file changed, 270 insertions(+)
    create mode 100644 arch/lib/sysctl.c

    diff --git a/arch/lib/sysctl.c b/arch/lib/sysctl.c
    new file mode 100644
    index 0000000..5f08f9f
    --- /dev/null
    +++ b/arch/lib/sysctl.c
    @@ -0,0 +1,270 @@
    +/*
    + * sysctl wrapper for library version of Linux kernel
    + * Copyright (c) 2015 INRIA, Hajime Tazaki
    + *
    + * Author: Mathieu Lacage <mathieu.lacage@gmail.com>
    + * Hajime Tazaki <tazaki@sfc.wide.ad.jp>
    + */
    +
    +#include <linux/mm.h>
    +#include <linux/mmzone.h>
    +#include <linux/mman.h>
    +#include <linux/ratelimit.h>
    +#include <linux/proc_fs.h>
    +#include "sim-assert.h"
    +#include "sim-types.h"
    +
    +int drop_caches_sysctl_handler(struct ctl_table *table, int write,
    + void *buffer, size_t *length, loff_t *ppos)
    +{
    + lib_assert(false);
    + return 0;
    +}
    +int lowmem_reserve_ratio_sysctl_handler(struct ctl_table *table, int write,
    + void *buffer, size_t *length,
    + loff_t *ppos)
    +{
    + lib_assert(false);
    + return 0;
    +}
    +int min_free_kbytes_sysctl_handler(struct ctl_table *table, int write,
    + void *buffer, size_t *length, loff_t *ppos)
    +{
    + lib_assert(false);
    + return 0;
    +}
    +
    +int percpu_pagelist_fraction_sysctl_handler(struct ctl_table *table, int write,
    + void *buffer, size_t *length,
    + loff_t *ppos)
    +{
    + lib_assert(false);
    + return 0;
    +}
    +int dirty_background_ratio_handler(struct ctl_table *table, int write,
    + void *buffer, size_t *lenp,
    + loff_t *ppos)
    +{
    + lib_assert(false);
    + return 0;
    +}
    +int dirty_background_bytes_handler(struct ctl_table *table, int write,
    + void *buffer, size_t *lenp,
    + loff_t *ppos)
    +{
    + lib_assert(false);
    + return 0;
    +}
    +int dirty_ratio_handler(struct ctl_table *table, int write,
    + void *buffer, size_t *lenp,
    + loff_t *ppos)
    +{
    + lib_assert(false);
    + return 0;
    +}
    +int dirty_bytes_handler(struct ctl_table *table, int write,
    + void *buffer, size_t *lenp,
    + loff_t *ppos)
    +{
    + lib_assert(false);
    + return 0;
    +}
    +int dirty_writeback_centisecs_handler(struct ctl_table *table, int write,
    + void *buffer, size_t *length,
    + loff_t *ppos)
    +{
    + lib_assert(false);
    + return 0;
    +}
    +int scan_unevictable_handler(struct ctl_table *table, int write,
    + void __user *buffer,
    + size_t *length, loff_t *ppos)
    +{
    + lib_assert(false);
    + return 0;
    +}
    +int sched_rt_handler(struct ctl_table *table, int write,
    + void __user *buffer, size_t *lenp,
    + loff_t *ppos)
    +{
    + lib_assert(false);
    + return 0;
    +}
    +
    +int sysctl_overcommit_memory = OVERCOMMIT_GUESS;
    +int sysctl_overcommit_ratio = 50;
    +int sysctl_panic_on_oom = 0;
    +int sysctl_oom_dump_tasks = 0;
    +int sysctl_oom_kill_allocating_task = 0;
    +int sysctl_nr_trim_pages = 0;
    +int sysctl_drop_caches = 0;
    +int sysctl_lowmem_reserve_ratio[MAX_NR_ZONES - 1] = { 32 };
    +unsigned int sysctl_sched_child_runs_first = 0;
    +unsigned int sysctl_sched_compat_yield = 0;
    +unsigned int sysctl_sched_rt_period = 1000000;
    +int sysctl_sched_rt_runtime = 950000;
    +
    +int vm_highmem_is_dirtyable;
    +unsigned long vm_dirty_bytes = 0;
    +int vm_dirty_ratio = 20;
    +int dirty_background_ratio = 10;
    +unsigned int dirty_expire_interval = 30 * 100;
    +unsigned int dirty_writeback_interval = 5 * 100;
    +unsigned long dirty_background_bytes = 0;
    +int percpu_pagelist_fraction = 0;
    +int panic_timeout = 0;
    +int panic_on_oops = 0;
    +int printk_delay_msec = 0;
    +int panic_on_warn = 0;
    +DEFINE_RATELIMIT_STATE(printk_ratelimit_state, 5 * HZ, 10);
    +
    +#define RESERVED_PIDS 300
    +int pid_max = PID_MAX_DEFAULT;
    +int pid_max_min = RESERVED_PIDS + 1;
    +int pid_max_max = PID_MAX_LIMIT;
    +int min_free_kbytes = 1024;
    +int max_threads = 100;
    +int laptop_mode = 0;
    +
    +#define DEFAULT_MESSAGE_LOGLEVEL 4
    +#define MINIMUM_CONSOLE_LOGLEVEL 1
    +#define DEFAULT_CONSOLE_LOGLEVEL 7
    +int console_printk[4] = {
    + DEFAULT_CONSOLE_LOGLEVEL, /* console_loglevel */
    + DEFAULT_MESSAGE_LOGLEVEL, /* default_message_loglevel */
    + MINIMUM_CONSOLE_LOGLEVEL, /* minimum_console_loglevel */
    + DEFAULT_CONSOLE_LOGLEVEL, /* default_console_loglevel */
    +};
    +
    +int print_fatal_signals = 0;
    +unsigned int core_pipe_limit = 0;
    +int core_uses_pid = 0;
    +int vm_swappiness = 60;
    +int nr_pdflush_threads = 0;
    +unsigned long scan_unevictable_pages = 0;
    +int suid_dumpable = 0;
    +int page_cluster = 0;
    +int block_dump = 0;
    +int C_A_D = 0;
    +#include <linux/nsproxy.h>
    +struct nsproxy init_nsproxy;
    +#include <linux/reboot.h>
    +char poweroff_cmd[POWEROFF_CMD_PATH_LEN] = "/sbin/poweroff";
    +unsigned long sysctl_user_reserve_kbytes __read_mostly = 1UL << 17; /* 128MB */
    +unsigned long sysctl_admin_reserve_kbytes __read_mostly = 1UL << 13; /* 8MB */
    +
    +int pdflush_proc_obsolete(struct ctl_table *table, int write,
    + void __user *buffer, size_t *lenp, loff_t *ppos)
    +{
    + return nr_pdflush_threads;
    +}
    +#include <linux/fs.h>
    +
    +/**
    + * Honestly, I don't understand half of that code.
    + * It was modeled after fs/proc/proc_sysctl.c proc_sys_readdir
    + *
    + * Me either ;) (Hajime, Jan 2013)
    + */
    +
    +/* from proc_sysctl.c (XXX) */
    +extern struct ctl_table_root sysctl_table_root;
    +void ctl_table_first_entry(struct ctl_dir *dir,
    + struct ctl_table_header **phead, struct ctl_table **pentry);
    +void ctl_table_next_entry(struct ctl_table_header **phead, struct ctl_table **pentry);
    +struct ctl_table *ctl_table_find_entry(struct ctl_table_header **phead,
    + struct ctl_dir *dir, const char *name,
    + int namelen);
    +struct ctl_dir *ctl_table_xlate_dir(struct ctl_table_set *set, struct ctl_dir *dir);
    +/* for init_net (XXX, should be fixed) */
    +#include <net/net_namespace.h>
    +
    +static void iterate_table_recursive(const struct SimSysIterator *iter,
    + struct ctl_table_header *head)
    +{
    + struct ctl_table *entry;
    +
    + for (entry = head->ctl_table; entry->procname; entry++) {
    + bool may_read = (head->ctl_table->mode & MAY_READ);
    + bool may_write = (head->ctl_table->mode & MAY_WRITE);
    + int flags = 0;
    +
    + flags |= may_read ? SIM_SYS_FILE_READ : 0;
    + flags |= may_write ? SIM_SYS_FILE_WRITE : 0;
    + iter->report_file(iter, entry->procname, flags,
    + (struct SimSysFile *)entry);
    + }
    +}
    +
    +
    +static void iterate_recursive(const struct SimSysIterator *iter,
    + struct ctl_table_header *head)
    +{
    + struct ctl_table_header *h = NULL;
    + struct ctl_table *entry;
    + struct ctl_dir *ctl_dir;
    +
    + ctl_dir = container_of(head, struct ctl_dir, header);
    + for (ctl_table_first_entry(ctl_dir, &h, &entry); h;
    + ctl_table_next_entry(&h, &entry)) {
    + struct ctl_dir *dir;
    + int ret;
    + const char *procname;
    +
    + /* copy from sysctl_follow_link () */
    + if (S_ISLNK(entry->mode)) {
    + dir = ctl_table_xlate_dir(&init_net.sysctls, h->parent);
    + if (IS_ERR(dir)) {
    + ret = PTR_ERR(dir);
    + lib_assert(false);
    + } else {
    + procname = entry->procname;
    + h = NULL;
    + entry =
    + ctl_table_find_entry(&h, dir, procname,
    + strlen(procname));
    + ret = -ENOENT;
    + }
    + }
    +
    + if (S_ISDIR(entry->mode)) {
    + iter->report_start_dir(iter, entry->procname);
    + iterate_recursive(iter, h);
    + iter->report_end_dir(iter);
    + } else
    + iterate_table_recursive(iter, h);
    + }
    +
    +}
    +
    +
    +void lib_sys_iterate_files(const struct SimSysIterator *iter)
    +{
    + struct ctl_table_header *root =
    + &sysctl_table_root.default_set.dir.header;
    +
    + iterate_recursive(iter, root);
    +}
    +
    +int lib_sys_file_read(const struct SimSysFile *file, char *buffer, int size,
    + int offset)
    +{
    + struct ctl_table *table = (struct ctl_table *)file;
    + loff_t ppos = offset;
    + size_t result = size;
    + int error;
    +
    + error = table->proc_handler(table, 0, buffer, &result, &ppos);
    + return result;
    +}
    +int lib_sys_file_write(const struct SimSysFile *file, const char *buffer,
    + int size, int offset)
    +{
    + struct ctl_table *table = (struct ctl_table *)file;
    + loff_t ppos = offset;
    + size_t result = size;
    + int error;
    +
    + error = table->proc_handler(table, 1, (char *)buffer, &result, &ppos);
    + return result;
    +}
    --
    2.1.0


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