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[davej-history.git] / fs / proc / array.c

/*
 *  linux/fs/proc/array.c
 *
 *  Copyright (C) 1992  by Linus Torvalds
 *  based on ideas by Darren Senn
 *
 * Fixes:
 * Michael. K. Johnson: stat,statm extensions.
 *                      <johnsonm@stolaf.edu>
 *
 * Pauline Middelink :  Made cmdline,envline only break at '\0's, to
 *                      make sure SET_PROCTITLE works. Also removed
 *                      bad '!' which forced address recalculation for
 *                      EVERY character on the current page.
 *                      <middelin@polyware.iaf.nl>
 *
 * Danny ter Haar    :  added cpuinfo
 *                      <dth@cistron.nl>
 *
 * Alessandro Rubini :  profile extension.
 *                      <rubini@ipvvis.unipv.it>
 *
 * Jeff Tranter      :  added BogoMips field to cpuinfo
 *                      <Jeff_Tranter@Mitel.COM>
 *
 * Bruno Haible      :  remove 4K limit for the maps file
 *                      <haible@ma2s2.mathematik.uni-karlsruhe.de>
 *
 * Yves Arrouye      :  remove removal of trailing spaces in get_array.
 *                      <Yves.Arrouye@marin.fdn.fr>
 *
 * Jerome Forissier  :  added per-CPU time information to /proc/stat
 *                      and /proc/<pid>/cpu extension
 *                      <forissier@isia.cma.fr>
 *                      - Incorporation and non-SMP safe operation
 *                      of forissier patch in 2.1.78 by
 *                      Hans Marcus <crowbar@concepts.nl>
 *
 * aeb@cwi.nl        :  /proc/partitions
 *
 *
 * Alan Cox          :  security fixes.
 *                      <Alan.Cox@linux.org>
 *
 * Al Viro           :  safe handling of mm_struct
 *
 * Gerhard Wichert   :  added BIGMEM support
 * Siemens AG           <Gerhard.Wichert@pdb.siemens.de>
 *
 * Al Viro & Jeff Garzik :  moved most of the thing into base.c and
 *                       :  proc_misc.c. The rest may eventually go into
 *                       :  base.c too.
 */

#include <linux/config.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/kernel_stat.h>
#include <linux/tty.h>
#include <linux/string.h>
#include <linux/mman.h>
#include <linux/proc_fs.h>
#include <linux/ioport.h>
#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/swap.h>
#include <linux/slab.h>
#include <linux/smp.h>
#include <linux/signal.h>
#include <linux/highmem.h>

#include <asm/uaccess.h>
#include <asm/pgtable.h>
#include <asm/io.h>
#include <asm/processor.h>

/* Gcc optimizes away "strlen(x)" for constant x */
#define ADDBUF(buffer, string) \
do { memcpy(buffer, string, strlen(string)); \
     buffer += strlen(string); } while (0)

static inline char * task_name(struct task_struct *p, char * buf)
{
        int i;
        char * name;

        ADDBUF(buf, "Name:\t");
        name = p->comm;
        i = sizeof(p->comm);
        do {
                unsigned char c = *name;
                name++;
                i--;
                *buf = c;
                if (!c)
                        break;
                if (c == '\\') {
                        buf[1] = c;
                        buf += 2;
                        continue;
                }
                if (c == '\n') {
                        buf[0] = '\\';
                        buf[1] = 'n';
                        buf += 2;
                        continue;
                }
                buf++;
        } while (i);
        *buf = '\n';
        return buf+1;
}

/*
 * The task state array is a strange "bitmap" of
 * reasons to sleep. Thus "running" is zero, and
 * you can test for combinations of others with
 * simple bit tests.
 */
static const char *task_state_array[] = {
        "R (running)",          /*  0 */
        "S (sleeping)",         /*  1 */
        "D (disk sleep)",       /*  2 */
        "Z (zombie)",           /*  4 */
        "T (stopped)",          /*  8 */
        "W (paging)"            /* 16 */
};

static inline const char * get_task_state(struct task_struct *tsk)
{
        unsigned int state = tsk->state & (TASK_RUNNING |
                                           TASK_INTERRUPTIBLE |
                                           TASK_UNINTERRUPTIBLE |
                                           TASK_ZOMBIE |
                                           TASK_STOPPED);
        const char **p = &task_state_array[0];

        while (state) {
                p++;
                state >>= 1;
        }
        return *p;
}

static inline char * task_state(struct task_struct *p, char *buffer)
{
        int g;

        read_lock(&tasklist_lock);
        buffer += sprintf(buffer,
                "State:\t%s\n"
                "Pid:\t%d\n"
                "PPid:\t%d\n"
                "TracerPid:\t%d\n"
                "Uid:\t%d\t%d\t%d\t%d\n"
                "Gid:\t%d\t%d\t%d\t%d\n",
                get_task_state(p),
                p->pid, p->p_opptr->pid, p->p_pptr->pid != p->p_opptr->pid ? p->p_opptr->pid : 0,
                p->uid, p->euid, p->suid, p->fsuid,
                p->gid, p->egid, p->sgid, p->fsgid);
        read_unlock(&tasklist_lock);    
        task_lock(p);
        buffer += sprintf(buffer,
                "FDSize:\t%d\n"
                "Groups:\t",
                p->files ? p->files->max_fds : 0);
        task_unlock(p);

        for (g = 0; g < p->ngroups; g++)
                buffer += sprintf(buffer, "%d ", p->groups[g]);

        buffer += sprintf(buffer, "\n");
        return buffer;
}

static inline char * task_mem(struct mm_struct *mm, char *buffer)
{
        struct vm_area_struct * vma;
        unsigned long data = 0, stack = 0;
        unsigned long exec = 0, lib = 0;

        down(&mm->mmap_sem);
        for (vma = mm->mmap; vma; vma = vma->vm_next) {
                unsigned long len = (vma->vm_end - vma->vm_start) >> 10;
                if (!vma->vm_file) {
                        data += len;
                        if (vma->vm_flags & VM_GROWSDOWN)
                                stack += len;
                        continue;
                }
                if (vma->vm_flags & VM_WRITE)
                        continue;
                if (vma->vm_flags & VM_EXEC) {
                        exec += len;
                        if (vma->vm_flags & VM_EXECUTABLE)
                                continue;
                        lib += len;
                }
        }
        buffer += sprintf(buffer,
                "VmSize:\t%8lu kB\n"
                "VmLck:\t%8lu kB\n"
                "VmRSS:\t%8lu kB\n"
                "VmData:\t%8lu kB\n"
                "VmStk:\t%8lu kB\n"
                "VmExe:\t%8lu kB\n"
                "VmLib:\t%8lu kB\n",
                mm->total_vm << (PAGE_SHIFT-10),
                mm->locked_vm << (PAGE_SHIFT-10),
                mm->rss << (PAGE_SHIFT-10),
                data - stack, stack,
                exec - lib, lib);
        up(&mm->mmap_sem);
        return buffer;
}

static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *ign,
                                    sigset_t *catch)
{
        struct k_sigaction *k;
        int i;

        sigemptyset(ign);
        sigemptyset(catch);

        if (p->sig) {
                k = p->sig->action;
                for (i = 1; i <= _NSIG; ++i, ++k) {
                        if (k->sa.sa_handler == SIG_IGN)
                                sigaddset(ign, i);
                        else if (k->sa.sa_handler != SIG_DFL)
                                sigaddset(catch, i);
                }
        }
}

static inline char * task_sig(struct task_struct *p, char *buffer)
{
        sigset_t ign, catch;

        buffer += sprintf(buffer, "SigPnd:\t");
        buffer = render_sigset_t(&p->pending.signal, buffer);
        *buffer++ = '\n';
        buffer += sprintf(buffer, "SigBlk:\t");
        buffer = render_sigset_t(&p->blocked, buffer);
        *buffer++ = '\n';

        collect_sigign_sigcatch(p, &ign, &catch);
        buffer += sprintf(buffer, "SigIgn:\t");
        buffer = render_sigset_t(&ign, buffer);
        *buffer++ = '\n';
        buffer += sprintf(buffer, "SigCgt:\t"); /* Linux 2.0 uses "SigCgt" */
        buffer = render_sigset_t(&catch, buffer);
        *buffer++ = '\n';

        return buffer;
}

extern inline char *task_cap(struct task_struct *p, char *buffer)
{
    return buffer + sprintf(buffer, "CapInh:\t%016x\n"
                            "CapPrm:\t%016x\n"
                            "CapEff:\t%016x\n",
                            cap_t(p->cap_inheritable),
                            cap_t(p->cap_permitted),
                            cap_t(p->cap_effective));
}


int proc_pid_status(struct task_struct *task, char * buffer)
{
        char * orig = buffer;
        struct mm_struct *mm;
#if defined(CONFIG_ARCH_S390)
        int line,len;
#endif

        buffer = task_name(task, buffer);
        buffer = task_state(task, buffer);
        task_lock(task);
        mm = task->mm;
        if(mm)
                atomic_inc(&mm->mm_users);
        task_unlock(task);
        if (mm) {
                buffer = task_mem(mm, buffer);
                mmput(mm);
        }
        buffer = task_sig(task, buffer);
        buffer = task_cap(task, buffer);
#if defined(CONFIG_ARCH_S390)
        for(line=0;(len=sprintf_regs(line,buffer,task,NULL,NULL))!=0;line++)
                buffer+=len;
#endif
        return buffer - orig;
}

int proc_pid_stat(struct task_struct *task, char * buffer)
{
        unsigned long vsize, eip, esp, wchan;
        long priority, nice;
        int tty_pgrp = -1, tty_nr = 0;
        sigset_t sigign, sigcatch;
        char state;
        int res;
        pid_t ppid;
        struct mm_struct *mm;

        state = *get_task_state(task);
        vsize = eip = esp = 0;
        task_lock(task);
        mm = task->mm;
        if(mm)
                atomic_inc(&mm->mm_users);
        if (task->tty) {
                tty_pgrp = task->tty->pgrp;
                tty_nr = kdev_t_to_nr(task->tty->device);
        }
        task_unlock(task);
        if (mm) {
                struct vm_area_struct *vma;
                down(&mm->mmap_sem);
                vma = mm->mmap;
                while (vma) {
                        vsize += vma->vm_end - vma->vm_start;
                        vma = vma->vm_next;
                }
                eip = KSTK_EIP(task);
                esp = KSTK_ESP(task);
                up(&mm->mmap_sem);
        }

        wchan = get_wchan(task);

        collect_sigign_sigcatch(task, &sigign, &sigcatch);

        /* scale priority and nice values from timeslices to -20..20 */
        /* to make it look like a "normal" Unix priority/nice value  */
        priority = task->counter;
        priority = 20 - (priority * 10 + DEF_COUNTER / 2) / DEF_COUNTER;
        nice = task->nice;

        read_lock(&tasklist_lock);
        ppid = task->p_opptr->pid;
        read_unlock(&tasklist_lock);
        res = sprintf(buffer,"%d (%s) %c %d %d %d %d %d %lu %lu \
%lu %lu %lu %lu %lu %ld %ld %ld %ld %ld %ld %lu %lu %ld %lu %lu %lu %lu %lu \
%lu %lu %lu %lu %lu %lu %lu %lu %d %d\n",
                task->pid,
                task->comm,
                state,
                ppid,
                task->pgrp,
                task->session,
                tty_nr,
                tty_pgrp,
                task->flags,
                task->min_flt,
                task->cmin_flt,
                task->maj_flt,
                task->cmaj_flt,
                task->times.tms_utime,
                task->times.tms_stime,
                task->times.tms_cutime,
                task->times.tms_cstime,
                priority,
                nice,
                0UL /* removed */,
                task->it_real_value,
                task->start_time,
                vsize,
                mm ? mm->rss : 0, /* you might want to shift this left 3 */
                task->rlim ? task->rlim[RLIMIT_RSS].rlim_cur : 0,
                mm ? mm->start_code : 0,
                mm ? mm->end_code : 0,
                mm ? mm->start_stack : 0,
                esp,
                eip,
                /* The signal information here is obsolete.
                 * It must be decimal for Linux 2.0 compatibility.
                 * Use /proc/#/status for real-time signals.
                 */
                task->pending.signal.sig[0] & 0x7fffffffUL,
                task->blocked.sig[0] & 0x7fffffffUL,
                sigign      .sig[0] & 0x7fffffffUL,
                sigcatch    .sig[0] & 0x7fffffffUL,
                wchan,
                task->nswap,
                task->cnswap,
                task->exit_signal,
                task->processor);
        if(mm)
                mmput(mm);
        return res;
}
                
static inline void statm_pte_range(pmd_t * pmd, unsigned long address, unsigned long size,
        int * pages, int * shared, int * dirty, int * total)
{
        pte_t * pte;
        unsigned long end;

        if (pmd_none(*pmd))
                return;
        if (pmd_bad(*pmd)) {
                pmd_ERROR(*pmd);
                pmd_clear(pmd);
                return;
        }
        pte = pte_offset(pmd, address);
        address &= ~PMD_MASK;
        end = address + size;
        if (end > PMD_SIZE)
                end = PMD_SIZE;
        do {
                pte_t page = *pte;
                struct page *ptpage;

                address += PAGE_SIZE;
                pte++;
                if (pte_none(page))
                        continue;
                ++*total;
                if (!pte_present(page))
                        continue;
                ++*pages;
                if (pte_dirty(page))
                        ++*dirty;
                ptpage = pte_page(page);
                if ((!VALID_PAGE(ptpage)) || 
                                        PageReserved(ptpage))
                        continue;
                if (page_count(pte_page(page)) > 1)
                        ++*shared;
        } while (address < end);
}

static inline void statm_pmd_range(pgd_t * pgd, unsigned long address, unsigned long size,
        int * pages, int * shared, int * dirty, int * total)
{
        pmd_t * pmd;
        unsigned long end;

        if (pgd_none(*pgd))
                return;
        if (pgd_bad(*pgd)) {
                pgd_ERROR(*pgd);
                pgd_clear(pgd);
                return;
        }
        pmd = pmd_offset(pgd, address);
        address &= ~PGDIR_MASK;
        end = address + size;
        if (end > PGDIR_SIZE)
                end = PGDIR_SIZE;
        do {
                statm_pte_range(pmd, address, end - address, pages, shared, dirty, total);
                address = (address + PMD_SIZE) & PMD_MASK;
                pmd++;
        } while (address < end);
}

static void statm_pgd_range(pgd_t * pgd, unsigned long address, unsigned long end,
        int * pages, int * shared, int * dirty, int * total)
{
        while (address < end) {
                statm_pmd_range(pgd, address, end - address, pages, shared, dirty, total);
                address = (address + PGDIR_SIZE) & PGDIR_MASK;
                pgd++;
        }
}

int proc_pid_statm(struct task_struct *task, char * buffer)
{
        struct mm_struct *mm;
        int size=0, resident=0, share=0, trs=0, lrs=0, drs=0, dt=0;

        task_lock(task);
        mm = task->mm;
        if(mm)
                atomic_inc(&mm->mm_users);
        task_unlock(task);
        if (mm) {
                struct vm_area_struct * vma;
                down(&mm->mmap_sem);
                vma = mm->mmap;
                while (vma) {
                        pgd_t *pgd = pgd_offset(mm, vma->vm_start);
                        int pages = 0, shared = 0, dirty = 0, total = 0;

                        statm_pgd_range(pgd, vma->vm_start, vma->vm_end, &pages, &shared, &dirty, &total);
                        resident += pages;
                        share += shared;
                        dt += dirty;
                        size += total;
                        if (vma->vm_flags & VM_EXECUTABLE)
                                trs += pages;   /* text */
                        else if (vma->vm_flags & VM_GROWSDOWN)
                                drs += pages;   /* stack */
                        else if (vma->vm_end > 0x60000000)
                                lrs += pages;   /* library */
                        else
                                drs += pages;
                        vma = vma->vm_next;
                }
                up(&mm->mmap_sem);
                mmput(mm);
        }
        return sprintf(buffer,"%d %d %d %d %d %d %d\n",
                       size, resident, share, trs, lrs, drs, dt);
}

/*
 * The way we support synthetic files > 4K
 * - without storing their contents in some buffer and
 * - without walking through the entire synthetic file until we reach the
 *   position of the requested data
 * is to cleverly encode the current position in the file's f_pos field.
 * There is no requirement that a read() call which returns `count' bytes
 * of data increases f_pos by exactly `count'.
 *
 * This idea is Linus' one. Bruno implemented it.
 */

/*
 * For the /proc/<pid>/maps file, we use fixed length records, each containing
 * a single line.
 */
#define MAPS_LINE_LENGTH        4096
#define MAPS_LINE_SHIFT         12
/*
 * f_pos = (number of the vma in the task->mm->mmap list) * MAPS_LINE_LENGTH
 *         + (index into the line)
 */
/* for systems with sizeof(void*) == 4: */
#define MAPS_LINE_FORMAT4         "%08lx-%08lx %s %08lx %s %lu"
#define MAPS_LINE_MAX4  49 /* sum of 8  1  8  1 4 1 8 1 5 1 10 1 */

/* for systems with sizeof(void*) == 8: */
#define MAPS_LINE_FORMAT8         "%016lx-%016lx %s %016lx %s %lu"
#define MAPS_LINE_MAX8  73 /* sum of 16  1  16  1 4 1 16 1 5 1 10 1 */

#define MAPS_LINE_MAX   MAPS_LINE_MAX8


ssize_t proc_pid_read_maps (struct task_struct *task, struct file * file, char * buf,
                          size_t count, loff_t *ppos)
{
        struct mm_struct *mm;
        struct vm_area_struct * map, * next;
        char * destptr = buf, * buffer;
        loff_t lineno;
        ssize_t column, i;
        int volatile_task;
        long retval;

        /*
         * We might sleep getting the page, so get it first.
         */
        retval = -ENOMEM;
        buffer = (char*)__get_free_page(GFP_KERNEL);
        if (!buffer)
                goto out;

        if (count == 0)
                goto getlen_out;
        task_lock(task);
        mm = task->mm;
        if (mm)
                atomic_inc(&mm->mm_users);
        task_unlock(task);
        if (!mm)
                goto getlen_out;

        /* Check whether the mmaps could change if we sleep */
        volatile_task = (task != current || atomic_read(&mm->mm_users) > 1);

        /* decode f_pos */
        lineno = *ppos >> MAPS_LINE_SHIFT;
        column = *ppos & (MAPS_LINE_LENGTH-1);

        /* quickly go to line lineno */
        down(&mm->mmap_sem);
        for (map = mm->mmap, i = 0; map && (i < lineno); map = map->vm_next, i++)
                continue;

        for ( ; map ; map = next ) {
                /* produce the next line */
                char *line;
                char str[5], *cp = str;
                int flags;
                kdev_t dev;
                unsigned long ino;
                int maxlen = (sizeof(void*) == 4) ?
                        MAPS_LINE_MAX4 :  MAPS_LINE_MAX8;
                int len;

                /*
                 * Get the next vma now (but it won't be used if we sleep).
                 */
                next = map->vm_next;
                flags = map->vm_flags;

                *cp++ = flags & VM_READ ? 'r' : '-';
                *cp++ = flags & VM_WRITE ? 'w' : '-';
                *cp++ = flags & VM_EXEC ? 'x' : '-';
                *cp++ = flags & VM_MAYSHARE ? 's' : 'p';
                *cp++ = 0;

                dev = 0;
                ino = 0;
                if (map->vm_file != NULL) {
                        dev = map->vm_file->f_dentry->d_inode->i_dev;
                        ino = map->vm_file->f_dentry->d_inode->i_ino;
                        line = d_path(map->vm_file->f_dentry,
                                      map->vm_file->f_vfsmnt,
                                      buffer, PAGE_SIZE);
                        buffer[PAGE_SIZE-1] = '\n';
                        line -= maxlen;
                        if(line < buffer)
                                line = buffer;
                } else
                        line = buffer;

                len = sprintf(line,
                              sizeof(void*) == 4 ? MAPS_LINE_FORMAT4 : MAPS_LINE_FORMAT8,
                              map->vm_start, map->vm_end, str, map->vm_pgoff << PAGE_SHIFT,
                              kdevname(dev), ino);

                if(map->vm_file) {
                        for(i = len; i < maxlen; i++)
                                line[i] = ' ';
                        len = buffer + PAGE_SIZE - line;
                } else
                        line[len++] = '\n';
                if (column >= len) {
                        column = 0; /* continue with next line at column 0 */
                        lineno++;
                        continue; /* we haven't slept */
                }

                i = len-column;
                if (i > count)
                        i = count;
                up(&mm->mmap_sem);
                copy_to_user(destptr, line+column, i); /* may have slept */
                down(&mm->mmap_sem);
                destptr += i;
                count   -= i;
                column  += i;
                if (column >= len) {
                        column = 0; /* next time: next line at column 0 */
                        lineno++;
                }

                /* done? */
                if (count == 0)
                        break;

                /* By writing to user space, we might have slept.
                 * Stop the loop, to avoid a race condition.
                 */
                if (volatile_task)
                        break;
        }
        up(&mm->mmap_sem);

        /* encode f_pos */
        *ppos = (lineno << MAPS_LINE_SHIFT) + column;
        mmput(mm);

getlen_out:
        retval = destptr - buf;
        free_page((unsigned long)buffer);
out:
        return retval;
}

#ifdef CONFIG_SMP
int proc_pid_cpu(struct task_struct *task, char * buffer)
{
        int i, len;

        len = sprintf(buffer,
                "cpu  %lu %lu\n",
                task->times.tms_utime,
                task->times.tms_stime);
                
        for (i = 0 ; i < smp_num_cpus; i++)
                len += sprintf(buffer + len, "cpu%d %lu %lu\n",
                        i,
                        task->per_cpu_utime[cpu_logical_map(i)],
                        task->per_cpu_stime[cpu_logical_map(i)]);

        return len;
}
#endif