refactoring /proc
This commit is contained in:
Tomoki Shirasawa
462
kernel/procfs.c
462
kernel/procfs.c
@@ -38,212 +38,37 @@ extern int sscanf(const char * buf, const char * fmt, ...);
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extern int osnum;
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void create_proc_procfs_files(int pid, int cpuid);
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void delete_proc_procfs_files(int pid);
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void create_os_procfs_files(void);
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void delete_os_procfs_files(void);
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static void create_proc_procfs_file(int pid, char *fname, int mode, int cpuid);
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static void delete_proc_procfs_file(int pid, char *fname);
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static void operate_proc_procfs_file(int pid, char *fname, int msg, int mode, int cpuid);
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int copy_from_user(void *dst, const void *src, size_t siz);
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int copy_to_user(void *dst, const void *src, size_t siz);
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/**
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* \brief Create all procfs files for process.
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*
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* \param pid pid of the process
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* \param cpuid cpuid of the process
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*/
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void create_proc_procfs_files(int pid, int cpuid)
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{
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char fname[PROCFS_NAME_MAX];
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dprintf("create procfs files:\n");
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snprintf(fname, PROCFS_NAME_MAX, "mcos%d/%d/auxv", osnum, pid);
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create_proc_procfs_file(pid, fname, 0400, cpuid);
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snprintf(fname, PROCFS_NAME_MAX, "mcos%d/%d/cmdline", osnum, pid);
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create_proc_procfs_file(pid, fname, 0444, cpuid);
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snprintf(fname, PROCFS_NAME_MAX, "mcos%d/%d/mem", osnum, pid);
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create_proc_procfs_file(pid, fname, 0400, cpuid);
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snprintf(fname, PROCFS_NAME_MAX, "mcos%d/%d/maps", osnum, pid);
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create_proc_procfs_file(pid, fname, 0444, cpuid);
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snprintf(fname, PROCFS_NAME_MAX, "mcos%d/%d/pagemap", osnum, pid);
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create_proc_procfs_file(pid, fname, 0444, cpuid);
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snprintf(fname, PROCFS_NAME_MAX, "mcos%d/%d/status", osnum, pid);
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create_proc_procfs_file(pid, fname, 0444, cpuid);
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snprintf(fname, PROCFS_NAME_MAX, "mcos%d/%d/task/%d/mem", osnum, pid, pid);
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create_proc_procfs_file(pid, fname, 0400, cpuid);
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snprintf(fname, PROCFS_NAME_MAX, "mcos%d/%d/task/%d/stat", osnum, pid, pid);
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create_proc_procfs_file(pid, fname, 0444, cpuid);
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dprintf("create procfs files: done\n");
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}
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/**
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* \brief Create a procfs file for process.
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*
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* \param pid pid of the process
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* \param fname file name of the procfs file
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* \param mode file mode
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* \param cpuid cpuid of the process
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*/
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static void create_proc_procfs_file(int pid, char *fname, int mode, int cpuid)
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{
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dprintf("create procfs file: %s, mode: %o, cpuid: %d\n", fname, mode, cpuid);
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operate_proc_procfs_file(pid, fname, SCD_MSG_PROCFS_CREATE, mode, cpuid);
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}
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/**
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* \brief Delete all procfs files for process.
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*
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* \param pid pid of the process
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*/
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void delete_proc_procfs_files(int pid)
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{
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char fname[PROCFS_NAME_MAX];
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dprintf("delete procfs files for pid %d.\n", pid);
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snprintf(fname, PROCFS_NAME_MAX, "mcos%d/%d/task/%d/mem", osnum, pid, pid);
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delete_proc_procfs_file(pid, fname);
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snprintf(fname, PROCFS_NAME_MAX, "mcos%d/%d/task/%d/stat", osnum, pid, pid);
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delete_proc_procfs_file(pid, fname);
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snprintf(fname, PROCFS_NAME_MAX, "mcos%d/%d/task/%d", osnum, pid, pid);
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delete_proc_procfs_file(pid, fname);
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snprintf(fname, PROCFS_NAME_MAX, "mcos%d/%d/task", osnum, pid);
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delete_proc_procfs_file(pid, fname);
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snprintf(fname, PROCFS_NAME_MAX, "mcos%d/%d/mem", osnum, pid);
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delete_proc_procfs_file(pid, fname);
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snprintf(fname, PROCFS_NAME_MAX, "mcos%d/%d/maps", osnum, pid);
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delete_proc_procfs_file(pid, fname);
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snprintf(fname, PROCFS_NAME_MAX, "mcos%d/%d/status", osnum, pid);
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delete_proc_procfs_file(pid, fname);
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snprintf(fname, PROCFS_NAME_MAX, "mcos%d/%d/pagemap", osnum, pid);
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delete_proc_procfs_file(pid, fname);
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snprintf(fname, PROCFS_NAME_MAX, "mcos%d/%d/cmdline", osnum, pid);
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delete_proc_procfs_file(pid, fname);
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snprintf(fname, PROCFS_NAME_MAX, "mcos%d/%d/auxv", osnum, pid);
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delete_proc_procfs_file(pid, fname);
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/* NOTE: Directory is removed on the host when mcexec drops the executable */
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dprintf("delete procfs files for pid %d: done\n", pid);
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}
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/**
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* \brief Delete a procfs file for process.
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*
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* \param pid pid of the process
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* \param fname file name of the procfs file
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*/
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static void delete_proc_procfs_file(int pid, char *fname)
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{
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dprintf("delete procfs file: %s\n", fname);
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operate_proc_procfs_file(pid, fname, SCD_MSG_PROCFS_DELETE, 0, 0);
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dprintf("delete procfs file: %s done\n", fname);
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}
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/**
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* \brief create a procfs file for this operating system
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* \param fname relative path name from "host:/proc".
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* \param mode permissions of the file to be created
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*
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* Though operate_proc_procfs_file() is intended to create a process
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* specific file, it is reused to create a OS specific file by
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* specifying -1 as the pid parameter.
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*/
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static void create_os_procfs_file(char *fname, int mode)
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{
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const pid_t pid = -1;
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const int msg = SCD_MSG_PROCFS_CREATE;
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const int cpuid = ihk_mc_get_processor_id(); /* i.e. BSP */
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operate_proc_procfs_file(pid, fname, msg, mode, cpuid);
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return;
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}
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/**
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* \brief create all procfs files for this operating system
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*/
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void create_os_procfs_files(void)
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{
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char *fname = NULL;
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size_t n;
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fname = kmalloc(PROCFS_NAME_MAX, IHK_MC_AP_CRITICAL);
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n = snprintf(fname, PROCFS_NAME_MAX, "mcos%d/stat", osnum);
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if (n >= PROCFS_NAME_MAX) panic("/proc/stat");
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create_os_procfs_file(fname, 0444);
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return;
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}
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/**
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* \brief Create/delete a procfs file for process.
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*
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* \param pid pid of the process
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* \param fname file name of the procfs file
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* \param msg message (create/delete)
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* \param mode file mode
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* \param cpuid cpuid of the process
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*/
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static void operate_proc_procfs_file(int pid, char *fname, int msg, int mode, int cpuid)
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static void
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procfs_thread_ctl(struct thread *thread, int msg)
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{
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struct ihk_ikc_channel_desc *syscall_channel;
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struct ikc_scd_packet pckt;
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struct procfs_file *f;
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int ret;
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struct ikc_scd_packet packet;
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syscall_channel = cpu_local_var(syscall_channel);
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memset(&packet, '\0', sizeof packet);
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packet.arg = thread->tid;
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packet.msg = msg;
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packet.osnum = osnum;
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packet.ref = thread->cpu_id;
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packet.pid = thread->proc->pid;
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packet.err = 0;
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f = kmalloc(sizeof(struct procfs_file), IHK_MC_AP_NOWAIT);
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if (!f) {
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kprintf("ERROR: not enough memory for dealing procfs file %s!",
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fname);
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return;
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}
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f->status = 0;
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f->mode = mode;
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strncpy(f->fname, fname, PROCFS_NAME_MAX);
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pckt.arg = virt_to_phys(f);
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pckt.msg = msg;
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pckt.osnum = osnum;
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pckt.ref = cpuid;
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pckt.pid = pid;
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pckt.err = 0;
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ihk_ikc_send(syscall_channel, &packet, 0);
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}
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ret = ihk_ikc_send(syscall_channel, &pckt, 0);
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if (ret < 0) {
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kprintf("ERROR: sending IKC msg, ret: %d\n", ret);
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}
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void
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procfs_create_thread(struct thread *thread)
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{
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procfs_thread_ctl(thread, SCD_MSG_PROCFS_TID_CREATE);
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}
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while (f->status != 1) {
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cpu_pause();
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}
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kfree(f);
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void
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procfs_delete_thread(struct thread *thread)
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{
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procfs_thread_ctl(thread, SCD_MSG_PROCFS_TID_DELETE);
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}
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/**
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@@ -251,12 +76,13 @@ static void operate_proc_procfs_file(int pid, char *fname, int msg, int mode, in
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*
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* \param rarg returned argument
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*/
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void process_procfs_request(unsigned long rarg)
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void
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process_procfs_request(unsigned long rarg)
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{
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unsigned long parg, pbuf;
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struct thread *thread = cpu_local_var(current);
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struct process *proc = thread->proc;
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struct thread *thread = NULL;
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struct process *proc = NULL;
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struct process_vm *vm = NULL;
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struct procfs_read *r;
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struct ikc_scd_packet packet;
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int rosnum, ret, pid, tid, ans = -EIO, eof = 0;
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@@ -266,7 +92,8 @@ void process_procfs_request(unsigned long rarg)
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unsigned long offset;
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int count;
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int npages;
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int is_current = 1; /* is 'proc' same as 'current'? */
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int readwrite = 0;
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dprintf("process_procfs_request: invoked.\n");
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@@ -296,6 +123,7 @@ void process_procfs_request(unsigned long rarg)
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goto bufunavail;
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}
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readwrite = r->readwrite;
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count = r->count;
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offset = r->offset;
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dprintf("fname: %s, offset: %lx, count:%d.\n", r->fname, r->offset, r->count);
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@@ -334,32 +162,38 @@ void process_procfs_request(unsigned long rarg)
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*/
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ret = sscanf(p, "%d/", &pid);
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if (ret == 1) {
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if (pid != cpu_local_var(current)->proc->pid) {
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/* We are not located in the proper cpu for some reason. */
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dprintf("mismatched pid. We are %d, but requested pid is %d.\n",
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pid, cpu_local_var(current)->pid);
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tid = pid; /* main thread */
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thread = find_thread(pid, tid, &lock);
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if (!thread) {
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dprintf("We cannot find the proper cpu for requested pid.\n");
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goto end;
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}
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else if (thread->cpu_id != ihk_mc_get_processor_id()) {
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/* The target process has gone by migration. */
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r->newcpu = thread->cpu_id;
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dprintf("expected cpu id is %d.\n", thread->cpu_id);
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thread_unlock(thread, &lock);
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ans = 0;
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goto end;
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}
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else {
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thread_unlock(thread, &lock);
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/* 'proc' is not 'current' */
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is_current = 0;
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}
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proc = thread->proc;
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proc = find_process(pid, &lock);
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if(proc == NULL){
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kprintf("process_procfs_request: no such pid %d\n", pid);
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goto end;
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}
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p = strchr(p, '/') + 1;
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ret = sscanf(p, "task/%d/", &tid);
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if(ret == 1){
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struct mcs_rwlock_node tlock;
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mcs_rwlock_reader_lock_noirq(&proc->threads_lock, &tlock);
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list_for_each_entry(thread, &proc->threads_list,
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siblings_list) {
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if(thread->tid == tid)
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break;
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}
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if(thread == NULL){
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mcs_rwlock_reader_unlock_noirq(&proc->threads_lock,
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&tlock);
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process_unlock(proc, &lock);
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kprintf("process_procfs_request: no such tid %d-%d\n", pid, tid);
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goto end;
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}
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hold_thread(thread);
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mcs_rwlock_reader_unlock_noirq(&proc->threads_lock, &tlock);
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p = strchr(p, '/') + 1;
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p = strchr(p, '/') + 1;
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}
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hold_process(proc);
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vm = proc->vm;
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if(vm)
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hold_process_vm(vm);
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process_unlock(proc, &lock);
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}
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else if (!strcmp(p, "stat")) { /* "/proc/stat" */
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extern int num_processors; /* kernel/ap.c */
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@@ -390,10 +224,9 @@ void process_procfs_request(unsigned long rarg)
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goto end;
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}
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else {
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kprintf("unsupported procfs entry: %s\n", p);
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goto end;
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}
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dprintf("matched PID: %d.\n", pid);
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p = strchr(p, '/') + 1;
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/*
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* mcos%d/PID/mem
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@@ -403,9 +236,8 @@ void process_procfs_request(unsigned long rarg)
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*/
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if (strcmp(p, "mem") == 0) {
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struct vm_range *range;
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struct process_vm *vm = proc->vm;
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if (!is_current) {
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if (proc != cpu_local_var(current)->proc) {
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uint64_t reason = PF_POPULATE | PF_WRITE | PF_USER;
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unsigned long offset = r->offset;
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unsigned long left = r->count;
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@@ -423,8 +255,8 @@ void process_procfs_request(unsigned long rarg)
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if(size > left)
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size = left;
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ret = page_fault_process_vm(proc->vm,
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(void *)offset, reason);
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ret = page_fault_process_vm(vm, (void *)offset,
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reason);
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if(ret){
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if(ans == 0)
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ans = -EIO;
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@@ -479,7 +311,6 @@ void process_procfs_request(unsigned long rarg)
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*/
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if (strcmp(p, "maps") == 0) {
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struct vm_range *range;
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struct process_vm *vm = proc->vm;
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int left = r->count - 1; /* extra 1 for terminating NULL */
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int written = 0;
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char *_buf = buf;
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@@ -537,7 +368,6 @@ void process_procfs_request(unsigned long rarg)
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* mcos%d/PID/pagemap
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*/
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if (strcmp(p, "pagemap") == 0) {
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struct process_vm *vm = proc->vm;
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uint64_t *_buf = (uint64_t *)buf;
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uint64_t start, end;
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@@ -673,112 +503,72 @@ void process_procfs_request(unsigned long rarg)
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* The offset is treated as the beginning of the virtual address area
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* of the process. The count is the length of the area.
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*/
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tid = pid;
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ret = sscanf(p, "task/%d/", &tid);
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if (ret == 1) {
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p = strchr(p, '/') + 1;
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p = strchr(p, '/') + 1;
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if (!strcmp(p, "mem")){
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struct vm_range *range;
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struct process_vm *vm = proc->vm;
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if (!strcmp(p, "stat")) {
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char tmp[1024];
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int len;
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if (!is_current) {
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goto end;
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/*
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* pid (comm) state ppid
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* pgrp session tty_nr tpgid
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* flags minflt cminflt majflt
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* cmajflt utime stime cutime
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* cstime priority nice num_threads
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* itrealvalue starttime vsize rss
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* rsslim startcode endcode startstack
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* kstkesp kstkeip signal blocked
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* sigignore sigcatch wchan nswap
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* cnswap exit_signal processor rt_priority
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* policy delayacct_blkio_ticks guest_time cguest_time
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*/
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ans = sprintf(tmp,
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"%d (%s) %c %d " // pid...
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"%d %d %d %d " // pgrp...
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"%u %lu %lu %lu " // flags...
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"%lu %lu %lu %ld " // cmajflt...
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"%ld %ld %ld %ld " // cstime...
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"%ld %llu %lu %ld " // itrealvalue...
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"%lu %lu %lu %lu " // rsslim...
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"%lu %lu %lu %lu " // kstkesp...
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"%lu %lu %lu %lu " // sigignore...
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"%lu %d %d %u " // cnswap...
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"%u %llu %lu %ld\n", // policy...
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0, "exe", 'R', 0, // pid...
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0, 0, 0, 0, // pgrp...
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0, 0L, 0L, 0L, // flags...
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0L, 0L, 0L, 0L, // cmajflt...
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0L, 0L, 0L, 0L, // cstime...
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0L, 0LL, 0L, 0L, // itrealvalue...
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0L, 0L, 0L, 0L, // rsslim...
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0L, 0L, 0L, 0L, // kstkesp...
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0L, 0L, 0L, 0L, // sigignore...
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0L, 0, thread->cpu_id, 0, // cnswap...
|
||||
0, 0LL, 0L, 0L // policy...
|
||||
);
|
||||
thread_unlock(thread, &lock);
|
||||
dprintf("tmp=%s\n", tmp);
|
||||
|
||||
len = strlen(tmp);
|
||||
if (r->offset < len) {
|
||||
if (r->offset + r->count < len) {
|
||||
ans = r->count;
|
||||
} else {
|
||||
eof = 1;
|
||||
ans = len;
|
||||
}
|
||||
if (pid != tid) {
|
||||
/* We are not multithreaded yet. */
|
||||
goto end;
|
||||
}
|
||||
list_for_each_entry(range, &vm->vm_range_list, list) {
|
||||
dprintf("range: %lx - %lx\n", range->start, range->end);
|
||||
if ((range->start <= r->offset) &&
|
||||
(r->offset < range->end)) {
|
||||
unsigned int len = r->count;
|
||||
if (range->end < r->offset + r->count) {
|
||||
len = range->end - r->offset;
|
||||
}
|
||||
memcpy((void *)buf, (void *)range->start, len);
|
||||
ans = len;
|
||||
break;
|
||||
}
|
||||
}
|
||||
goto end;
|
||||
strncpy(buf, tmp + r->offset, ans);
|
||||
} else if (r->offset == len) {
|
||||
ans = 0;
|
||||
eof = 1;
|
||||
}
|
||||
|
||||
if (!strcmp(p, "stat")) {
|
||||
char tmp[1024];
|
||||
int len;
|
||||
|
||||
if ((thread = find_thread(pid, tid, &lock))){
|
||||
dprintf("thread found! pid=%d tid=%d\n", pid, tid);
|
||||
/*
|
||||
* pid (comm) state ppid
|
||||
* pgrp session tty_nr tpgid
|
||||
* flags minflt cminflt majflt
|
||||
* cmajflt utime stime cutime
|
||||
* cstime priority nice num_threads
|
||||
* itrealvalue starttime vsize rss
|
||||
* rsslim startcode endcode startstack
|
||||
* kstkesp kstkeip signal blocked
|
||||
* sigignore sigcatch wchan nswap
|
||||
* cnswap exit_signal processor rt_priority
|
||||
* policy delayacct_blkio_ticks guest_time cguest_time
|
||||
*/
|
||||
ans = sprintf(tmp,
|
||||
"%d (%s) %c %d " // pid...
|
||||
"%d %d %d %d " // pgrp...
|
||||
"%u %lu %lu %lu " // flags...
|
||||
"%lu %lu %lu %ld " // cmajflt...
|
||||
"%ld %ld %ld %ld " // cstime...
|
||||
"%ld %llu %lu %ld " // itrealvalue...
|
||||
"%lu %lu %lu %lu " // rsslim...
|
||||
"%lu %lu %lu %lu " // kstkesp...
|
||||
"%lu %lu %lu %lu " // sigignore...
|
||||
"%lu %d %d %u " // cnswap...
|
||||
"%u %llu %lu %ld\n", // policy...
|
||||
0, "exe", 'R', 0, // pid...
|
||||
0, 0, 0, 0, // pgrp...
|
||||
0, 0L, 0L, 0L, // flags...
|
||||
0L, 0L, 0L, 0L, // cmajflt...
|
||||
0L, 0L, 0L, 0L, // cstime...
|
||||
0L, 0LL, 0L, 0L, // itrealvalue...
|
||||
0L, 0L, 0L, 0L, // rsslim...
|
||||
0L, 0L, 0L, 0L, // kstkesp...
|
||||
0L, 0L, 0L, 0L, // sigignore...
|
||||
0L, 0, thread->cpu_id, 0, // cnswap...
|
||||
0, 0LL, 0L, 0L // policy...
|
||||
);
|
||||
thread_unlock(thread, &lock);
|
||||
dprintf("tmp=%s\n", tmp);
|
||||
|
||||
len = strlen(tmp);
|
||||
if (r->offset < len) {
|
||||
if (r->offset + r->count < len) {
|
||||
ans = r->count;
|
||||
} else {
|
||||
eof = 1;
|
||||
ans = len;
|
||||
}
|
||||
strncpy(buf, tmp + r->offset, ans);
|
||||
} else if (r->offset == len) {
|
||||
ans = 0;
|
||||
eof = 1;
|
||||
}
|
||||
goto end;
|
||||
}
|
||||
else{
|
||||
dprintf("no thread found pid=%d tid=%d\n", pid, tid);
|
||||
}
|
||||
}
|
||||
dprintf("could not find a matching entry for task/%d/%s.\n", tid, p);
|
||||
goto end;
|
||||
}
|
||||
|
||||
/*
|
||||
* Processing for pattern "mcos%d/PID/xxx" files should be here.
|
||||
*/
|
||||
dprintf("could not find a matching entry for %s.\n", p);
|
||||
if(thread)
|
||||
kprintf("unsupported procfs entry: %d/task/%d/%s\n", pid, tid, p);
|
||||
else
|
||||
kprintf("unsupported procfs entry: %d/%s\n", pid, p);
|
||||
|
||||
end:
|
||||
ihk_mc_unmap_virtual(buf, npages, 0);
|
||||
dprintf("ret: %d, eof: %d\n", ans, eof);
|
||||
@@ -799,6 +589,12 @@ dataunavail:
|
||||
if (ret < 0) {
|
||||
kprintf("ERROR: sending IKC msg, ret: %d\n", ret);
|
||||
}
|
||||
if(proc)
|
||||
release_process(proc);
|
||||
if(thread)
|
||||
release_thread(thread);
|
||||
if(vm)
|
||||
release_process_vm(vm);
|
||||
return;
|
||||
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user