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FreeBSD/Linux Kernel Cross Reference
sys/fs/proc/array.c

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    1 /*
    2  *  linux/fs/proc/array.c
    3  *
    4  *  Copyright (C) 1992  by Linus Torvalds
    5  *  based on ideas by Darren Senn
    6  *
    7  * Fixes:
    8  * Michael. K. Johnson: stat,statm extensions.
    9  *                      <johnsonm@stolaf.edu>
   10  *
   11  * Pauline Middelink :  Made cmdline,envline only break at '\0's, to
   12  *                      make sure SET_PROCTITLE works. Also removed
   13  *                      bad '!' which forced address recalculation for
   14  *                      EVERY character on the current page.
   15  *                      <middelin@polyware.iaf.nl>
   16  *
   17  * Danny ter Haar    :  added cpuinfo
   18  *                      <dth@cistron.nl>
   19  *
   20  * Alessandro Rubini :  profile extension.
   21  *                      <rubini@ipvvis.unipv.it>
   22  *
   23  * Jeff Tranter      :  added BogoMips field to cpuinfo
   24  *                      <Jeff_Tranter@Mitel.COM>
   25  *
   26  * Bruno Haible      :  remove 4K limit for the maps file
   27  *                      <haible@ma2s2.mathematik.uni-karlsruhe.de>
   28  *
   29  * Yves Arrouye      :  remove removal of trailing spaces in get_array.
   30  *                      <Yves.Arrouye@marin.fdn.fr>
   31  *
   32  * Jerome Forissier  :  added per-CPU time information to /proc/stat
   33  *                      and /proc/<pid>/cpu extension
   34  *                      <forissier@isia.cma.fr>
   35  *                      - Incorporation and non-SMP safe operation
   36  *                      of forissier patch in 2.1.78 by
   37  *                      Hans Marcus <crowbar@concepts.nl>
   38  *
   39  * aeb@cwi.nl        :  /proc/partitions
   40  *
   41  *
   42  * Alan Cox          :  security fixes.
   43  *                      <Alan.Cox@linux.org>
   44  *
   45  * Al Viro           :  safe handling of mm_struct
   46  *
   47  * Gerhard Wichert   :  added BIGMEM support
   48  * Siemens AG           <Gerhard.Wichert@pdb.siemens.de>
   49  *
   50  * Al Viro & Jeff Garzik :  moved most of the thing into base.c and
   51  *                       :  proc_misc.c. The rest may eventually go into
   52  *                       :  base.c too.
   53  */
   54 
   55 #include <linux/config.h>
   56 #include <linux/types.h>
   57 #include <linux/errno.h>
   58 #include <linux/sched.h>
   59 #include <linux/kernel.h>
   60 #include <linux/kernel_stat.h>
   61 #include <linux/tty.h>
   62 #include <linux/string.h>
   63 #include <linux/mman.h>
   64 #include <linux/proc_fs.h>
   65 #include <linux/ioport.h>
   66 #include <linux/mm.h>
   67 #include <linux/pagemap.h>
   68 #include <linux/swap.h>
   69 #include <linux/slab.h>
   70 #include <linux/smp.h>
   71 #include <linux/signal.h>
   72 #include <linux/highmem.h>
   73 
   74 #include <asm/uaccess.h>
   75 #include <asm/pgtable.h>
   76 #include <asm/io.h>
   77 #include <asm/processor.h>
   78 
   79 /* Gcc optimizes away "strlen(x)" for constant x */
   80 #define ADDBUF(buffer, string) \
   81 do { memcpy(buffer, string, strlen(string)); \
   82      buffer += strlen(string); } while (0)
   83 
   84 static inline char * task_name(struct task_struct *p, char * buf)
   85 {
   86         int i;
   87         char * name;
   88 
   89         ADDBUF(buf, "Name:\t");
   90         name = p->comm;
   91         i = sizeof(p->comm);
   92         do {
   93                 unsigned char c = *name;
   94                 name++;
   95                 i--;
   96                 *buf = c;
   97                 if (!c)
   98                         break;
   99                 if (c == '\\') {
  100                         buf[1] = c;
  101                         buf += 2;
  102                         continue;
  103                 }
  104                 if (c == '\n') {
  105                         buf[0] = '\\';
  106                         buf[1] = 'n';
  107                         buf += 2;
  108                         continue;
  109                 }
  110                 buf++;
  111         } while (i);
  112         *buf = '\n';
  113         return buf+1;
  114 }
  115 
  116 /*
  117  * The task state array is a strange "bitmap" of
  118  * reasons to sleep. Thus "running" is zero, and
  119  * you can test for combinations of others with
  120  * simple bit tests.
  121  */
  122 static const char *task_state_array[] = {
  123         "R (running)",          /*  0 */
  124         "S (sleeping)",         /*  1 */
  125         "D (disk sleep)",       /*  2 */
  126         "Z (zombie)",           /*  4 */
  127         "T (stopped)",          /*  8 */
  128         "W (paging)"            /* 16 */
  129 };
  130 
  131 static inline const char * get_task_state(struct task_struct *tsk)
  132 {
  133         unsigned int state = tsk->state & (TASK_RUNNING |
  134                                            TASK_INTERRUPTIBLE |
  135                                            TASK_UNINTERRUPTIBLE |
  136                                            TASK_ZOMBIE |
  137                                            TASK_STOPPED);
  138         const char **p = &task_state_array[0];
  139 
  140         while (state) {
  141                 p++;
  142                 state >>= 1;
  143         }
  144         return *p;
  145 }
  146 
  147 static inline char * task_state(struct task_struct *p, char *buffer)
  148 {
  149         int g;
  150 
  151         read_lock(&tasklist_lock);
  152         buffer += sprintf(buffer,
  153                 "State:\t%s\n"
  154                 "Tgid:\t%d\n"
  155                 "Pid:\t%d\n"
  156                 "PPid:\t%d\n"
  157                 "TracerPid:\t%d\n"
  158                 "Uid:\t%d\t%d\t%d\t%d\n"
  159                 "Gid:\t%d\t%d\t%d\t%d\n",
  160                 get_task_state(p), p->tgid,
  161                 p->pid, p->pid ? p->p_opptr->pid : 0, 0,
  162                 p->uid, p->euid, p->suid, p->fsuid,
  163                 p->gid, p->egid, p->sgid, p->fsgid);
  164         read_unlock(&tasklist_lock);    
  165         task_lock(p);
  166         buffer += sprintf(buffer,
  167                 "FDSize:\t%d\n"
  168                 "Groups:\t",
  169                 p->files ? p->files->max_fds : 0);
  170         task_unlock(p);
  171 
  172         for (g = 0; g < p->ngroups; g++)
  173                 buffer += sprintf(buffer, "%d ", p->groups[g]);
  174 
  175         buffer += sprintf(buffer, "\n");
  176         return buffer;
  177 }
  178 
  179 static inline char * task_mem(struct mm_struct *mm, char *buffer)
  180 {
  181         struct vm_area_struct * vma;
  182         unsigned long data = 0, stack = 0;
  183         unsigned long exec = 0, lib = 0;
  184 
  185         down_read(&mm->mmap_sem);
  186         for (vma = mm->mmap; vma; vma = vma->vm_next) {
  187                 unsigned long len = (vma->vm_end - vma->vm_start) >> 10;
  188                 if (!vma->vm_file) {
  189                         data += len;
  190                         if (vma->vm_flags & VM_GROWSDOWN)
  191                                 stack += len;
  192                         continue;
  193                 }
  194                 if (vma->vm_flags & VM_WRITE)
  195                         continue;
  196                 if (vma->vm_flags & VM_EXEC) {
  197                         exec += len;
  198                         if (vma->vm_flags & VM_EXECUTABLE)
  199                                 continue;
  200                         lib += len;
  201                 }
  202         }
  203         buffer += sprintf(buffer,
  204                 "VmSize:\t%8lu kB\n"
  205                 "VmLck:\t%8lu kB\n"
  206                 "VmRSS:\t%8lu kB\n"
  207                 "VmData:\t%8lu kB\n"
  208                 "VmStk:\t%8lu kB\n"
  209                 "VmExe:\t%8lu kB\n"
  210                 "VmLib:\t%8lu kB\n",
  211                 mm->total_vm << (PAGE_SHIFT-10),
  212                 mm->locked_vm << (PAGE_SHIFT-10),
  213                 mm->rss << (PAGE_SHIFT-10),
  214                 data - stack, stack,
  215                 exec - lib, lib);
  216         up_read(&mm->mmap_sem);
  217         return buffer;
  218 }
  219 
  220 static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *ign,
  221                                     sigset_t *catch)
  222 {
  223         struct k_sigaction *k;
  224         int i;
  225 
  226         sigemptyset(ign);
  227         sigemptyset(catch);
  228 
  229         spin_lock_irq(&p->sigmask_lock);
  230 
  231         if (p->sig) {
  232                 k = p->sig->action;
  233                 for (i = 1; i <= _NSIG; ++i, ++k) {
  234                         if (k->sa.sa_handler == SIG_IGN)
  235                                 sigaddset(ign, i);
  236                         else if (k->sa.sa_handler != SIG_DFL)
  237                                 sigaddset(catch, i);
  238                 }
  239         }
  240         spin_unlock_irq(&p->sigmask_lock);
  241 }
  242 
  243 static inline char * task_sig(struct task_struct *p, char *buffer)
  244 {
  245         sigset_t ign, catch;
  246 
  247         buffer += sprintf(buffer, "SigPnd:\t");
  248         buffer = render_sigset_t(&p->pending.signal, buffer);
  249         *buffer++ = '\n';
  250         buffer += sprintf(buffer, "SigBlk:\t");
  251         buffer = render_sigset_t(&p->blocked, buffer);
  252         *buffer++ = '\n';
  253 
  254         collect_sigign_sigcatch(p, &ign, &catch);
  255         buffer += sprintf(buffer, "SigIgn:\t");
  256         buffer = render_sigset_t(&ign, buffer);
  257         *buffer++ = '\n';
  258         buffer += sprintf(buffer, "SigCgt:\t"); /* Linux 2.0 uses "SigCgt" */
  259         buffer = render_sigset_t(&catch, buffer);
  260         *buffer++ = '\n';
  261 
  262         return buffer;
  263 }
  264 
  265 static inline char *task_cap(struct task_struct *p, char *buffer)
  266 {
  267     return buffer + sprintf(buffer, "CapInh:\t%016x\n"
  268                             "CapPrm:\t%016x\n"
  269                             "CapEff:\t%016x\n",
  270                             cap_t(p->cap_inheritable),
  271                             cap_t(p->cap_permitted),
  272                             cap_t(p->cap_effective));
  273 }
  274 
  275 
  276 int proc_pid_status(struct task_struct *task, char * buffer)
  277 {
  278         char * orig = buffer;
  279         struct mm_struct *mm;
  280 
  281         buffer = task_name(task, buffer);
  282         buffer = task_state(task, buffer);
  283         task_lock(task);
  284         mm = task->mm;
  285         if(mm)
  286                 atomic_inc(&mm->mm_users);
  287         task_unlock(task);
  288         if (mm) {
  289                 buffer = task_mem(mm, buffer);
  290                 mmput(mm);
  291         }
  292         buffer = task_sig(task, buffer);
  293         buffer = task_cap(task, buffer);
  294 #if defined(CONFIG_ARCH_S390)
  295         buffer = task_show_regs(task, buffer);
  296 #endif
  297         return buffer - orig;
  298 }
  299 
  300 int proc_pid_stat(struct task_struct *task, char * buffer)
  301 {
  302         unsigned long vsize, eip, esp, wchan;
  303         long priority, nice;
  304         int tty_pgrp = -1, tty_nr = 0;
  305         sigset_t sigign, sigcatch;
  306         char state;
  307         int res;
  308         pid_t ppid;
  309         struct mm_struct *mm;
  310 
  311         state = *get_task_state(task);
  312         vsize = eip = esp = 0;
  313         task_lock(task);
  314         mm = task->mm;
  315         if(mm)
  316                 atomic_inc(&mm->mm_users);
  317         if (task->tty) {
  318                 tty_pgrp = task->tty->pgrp;
  319                 tty_nr = kdev_t_to_nr(task->tty->device);
  320         }
  321         task_unlock(task);
  322         if (mm) {
  323                 struct vm_area_struct *vma;
  324                 down_read(&mm->mmap_sem);
  325                 vma = mm->mmap;
  326                 while (vma) {
  327                         vsize += vma->vm_end - vma->vm_start;
  328                         vma = vma->vm_next;
  329                 }
  330                 eip = KSTK_EIP(task);
  331                 esp = KSTK_ESP(task);
  332                 up_read(&mm->mmap_sem);
  333         }
  334 
  335         wchan = get_wchan(task);
  336 
  337         collect_sigign_sigcatch(task, &sigign, &sigcatch);
  338 
  339         /* scale priority and nice values from timeslices to -20..20 */
  340         /* to make it look like a "normal" Unix priority/nice value  */
  341         priority = task->counter;
  342         priority = 20 - (priority * 10 + DEF_COUNTER / 2) / DEF_COUNTER;
  343         nice = task->nice;
  344 
  345         read_lock(&tasklist_lock);
  346         ppid = task->pid ? task->p_opptr->pid : 0;
  347         read_unlock(&tasklist_lock);
  348         res = sprintf(buffer,"%d (%s) %c %d %d %d %d %d %lu %lu \
  349 %lu %lu %lu %lu %lu %ld %ld %ld %ld %ld %ld %lu %lu %ld %lu %lu %lu %lu %lu \
  350 %lu %lu %lu %lu %lu %lu %lu %lu %d %d\n",
  351                 task->pid,
  352                 task->comm,
  353                 state,
  354                 ppid,
  355                 task->pgrp,
  356                 task->session,
  357                 tty_nr,
  358                 tty_pgrp,
  359                 task->flags,
  360                 task->min_flt,
  361                 task->cmin_flt,
  362                 task->maj_flt,
  363                 task->cmaj_flt,
  364                 task->times.tms_utime,
  365                 task->times.tms_stime,
  366                 task->times.tms_cutime,
  367                 task->times.tms_cstime,
  368                 priority,
  369                 nice,
  370                 0UL /* removed */,
  371                 task->it_real_value,
  372                 task->start_time,
  373                 vsize,
  374                 mm ? mm->rss : 0, /* you might want to shift this left 3 */
  375                 task->rlim[RLIMIT_RSS].rlim_cur,
  376                 mm ? mm->start_code : 0,
  377                 mm ? mm->end_code : 0,
  378                 mm ? mm->start_stack : 0,
  379                 esp,
  380                 eip,
  381                 /* The signal information here is obsolete.
  382                  * It must be decimal for Linux 2.0 compatibility.
  383                  * Use /proc/#/status for real-time signals.
  384                  */
  385                 task->pending.signal.sig[0] & 0x7fffffffUL,
  386                 task->blocked.sig[0] & 0x7fffffffUL,
  387                 sigign      .sig[0] & 0x7fffffffUL,
  388                 sigcatch    .sig[0] & 0x7fffffffUL,
  389                 wchan,
  390                 task->nswap,
  391                 task->cnswap,
  392                 task->exit_signal,
  393                 task->processor);
  394         if(mm)
  395                 mmput(mm);
  396         return res;
  397 }
  398                 
  399 static inline void statm_pte_range(pmd_t * pmd, unsigned long address, unsigned long size,
  400         int * pages, int * shared, int * dirty, int * total)
  401 {
  402         pte_t * pte;
  403         unsigned long end;
  404 
  405         if (pmd_none(*pmd))
  406                 return;
  407         if (pmd_bad(*pmd)) {
  408                 pmd_ERROR(*pmd);
  409                 pmd_clear(pmd);
  410                 return;
  411         }
  412         pte = pte_offset(pmd, address);
  413         address &= ~PMD_MASK;
  414         end = address + size;
  415         if (end > PMD_SIZE)
  416                 end = PMD_SIZE;
  417         do {
  418                 pte_t page = *pte;
  419                 struct page *ptpage;
  420 
  421                 address += PAGE_SIZE;
  422                 pte++;
  423                 if (pte_none(page))
  424                         continue;
  425                 ++*total;
  426                 if (!pte_present(page))
  427                         continue;
  428                 ptpage = pte_page(page);
  429                 if ((!VALID_PAGE(ptpage)) || PageReserved(ptpage))
  430                         continue;
  431                 ++*pages;
  432                 if (pte_dirty(page))
  433                         ++*dirty;
  434                 if (page_count(pte_page(page)) > 1)
  435                         ++*shared;
  436         } while (address < end);
  437 }
  438 
  439 static inline void statm_pmd_range(pgd_t * pgd, unsigned long address, unsigned long size,
  440         int * pages, int * shared, int * dirty, int * total)
  441 {
  442         pmd_t * pmd;
  443         unsigned long end;
  444 
  445         if (pgd_none(*pgd))
  446                 return;
  447         if (pgd_bad(*pgd)) {
  448                 pgd_ERROR(*pgd);
  449                 pgd_clear(pgd);
  450                 return;
  451         }
  452         pmd = pmd_offset(pgd, address);
  453         address &= ~PGDIR_MASK;
  454         end = address + size;
  455         if (end > PGDIR_SIZE)
  456                 end = PGDIR_SIZE;
  457         do {
  458                 statm_pte_range(pmd, address, end - address, pages, shared, dirty, total);
  459                 address = (address + PMD_SIZE) & PMD_MASK;
  460                 pmd++;
  461         } while (address < end);
  462 }
  463 
  464 static void statm_pgd_range(pgd_t * pgd, unsigned long address, unsigned long end,
  465         int * pages, int * shared, int * dirty, int * total)
  466 {
  467         while (address < end) {
  468                 statm_pmd_range(pgd, address, end - address, pages, shared, dirty, total);
  469                 address = (address + PGDIR_SIZE) & PGDIR_MASK;
  470                 pgd++;
  471         }
  472 }
  473 
  474 int proc_pid_statm(struct task_struct *task, char * buffer)
  475 {
  476         struct mm_struct *mm;
  477         int size=0, resident=0, share=0, trs=0, lrs=0, drs=0, dt=0;
  478 
  479         task_lock(task);
  480         mm = task->mm;
  481         if(mm)
  482                 atomic_inc(&mm->mm_users);
  483         task_unlock(task);
  484         if (mm) {
  485                 struct vm_area_struct * vma;
  486                 down_read(&mm->mmap_sem);
  487                 vma = mm->mmap;
  488                 while (vma) {
  489                         pgd_t *pgd = pgd_offset(mm, vma->vm_start);
  490                         int pages = 0, shared = 0, dirty = 0, total = 0;
  491 
  492                         statm_pgd_range(pgd, vma->vm_start, vma->vm_end, &pages, &shared, &dirty, &total);
  493                         resident += pages;
  494                         share += shared;
  495                         dt += dirty;
  496                         size += total;
  497                         if (vma->vm_flags & VM_EXECUTABLE)
  498                                 trs += pages;   /* text */
  499                         else if (vma->vm_flags & VM_GROWSDOWN)
  500                                 drs += pages;   /* stack */
  501                         else if (vma->vm_end > 0x60000000)
  502                                 lrs += pages;   /* library */
  503                         else
  504                                 drs += pages;
  505                         vma = vma->vm_next;
  506                 }
  507                 up_read(&mm->mmap_sem);
  508                 mmput(mm);
  509         }
  510         return sprintf(buffer,"%d %d %d %d %d %d %d\n",
  511                        size, resident, share, trs, lrs, drs, dt);
  512 }
  513 
  514 /*
  515  * The way we support synthetic files > 4K
  516  * - without storing their contents in some buffer and
  517  * - without walking through the entire synthetic file until we reach the
  518  *   position of the requested data
  519  * is to cleverly encode the current position in the file's f_pos field.
  520  * There is no requirement that a read() call which returns `count' bytes
  521  * of data increases f_pos by exactly `count'.
  522  *
  523  * This idea is Linus' one. Bruno implemented it.
  524  */
  525 
  526 /*
  527  * For the /proc/<pid>/maps file, we use fixed length records, each containing
  528  * a single line.
  529  *
  530  * f_pos = (number of the vma in the task->mm->mmap list) * PAGE_SIZE
  531  *         + (index into the line)
  532  */
  533 /* for systems with sizeof(void*) == 4: */
  534 #define MAPS_LINE_FORMAT4         "%08lx-%08lx %s %08lx %s %lu"
  535 #define MAPS_LINE_MAX4  49 /* sum of 8  1  8  1 4 1 8 1 5 1 10 1 */
  536 
  537 /* for systems with sizeof(void*) == 8: */
  538 #define MAPS_LINE_FORMAT8         "%016lx-%016lx %s %016lx %s %lu"
  539 #define MAPS_LINE_MAX8  73 /* sum of 16  1  16  1 4 1 16 1 5 1 10 1 */
  540 
  541 #define MAPS_LINE_FORMAT        (sizeof(void*) == 4 ? MAPS_LINE_FORMAT4 : MAPS_LINE_FORMAT8)
  542 #define MAPS_LINE_MAX   (sizeof(void*) == 4 ?  MAPS_LINE_MAX4 :  MAPS_LINE_MAX8)
  543 
  544 static int proc_pid_maps_get_line (char *buf, struct vm_area_struct *map)
  545 {
  546         /* produce the next line */
  547         char *line;
  548         char str[5];
  549         int flags;
  550         kdev_t dev;
  551         unsigned long ino;
  552         int len;
  553 
  554         flags = map->vm_flags;
  555 
  556         str[0] = flags & VM_READ ? 'r' : '-';
  557         str[1] = flags & VM_WRITE ? 'w' : '-';
  558         str[2] = flags & VM_EXEC ? 'x' : '-';
  559         str[3] = flags & VM_MAYSHARE ? 's' : 'p';
  560         str[4] = 0;
  561 
  562         dev = 0;
  563         ino = 0;
  564         if (map->vm_file != NULL) {
  565                 dev = map->vm_file->f_dentry->d_inode->i_dev;
  566                 ino = map->vm_file->f_dentry->d_inode->i_ino;
  567                 line = d_path(map->vm_file->f_dentry,
  568                               map->vm_file->f_vfsmnt,
  569                               buf, PAGE_SIZE);
  570                 if (IS_ERR(line))
  571                         return PTR_ERR(line);
  572                 buf[PAGE_SIZE-1] = '\n';
  573                 line -= MAPS_LINE_MAX;
  574                 if(line < buf)
  575                         line = buf;
  576         } else
  577                 line = buf;
  578 
  579         len = sprintf(line,
  580                       MAPS_LINE_FORMAT,
  581                       map->vm_start, map->vm_end, str, map->vm_pgoff << PAGE_SHIFT,
  582                       kdevname(dev), ino);
  583 
  584         if(map->vm_file) {
  585                 int i;
  586                 for(i = len; i < MAPS_LINE_MAX; i++)
  587                         line[i] = ' ';
  588                 len = buf + PAGE_SIZE - line;
  589                 memmove(buf, line, len);
  590         } else
  591                 line[len++] = '\n';
  592         return len;
  593 }
  594 
  595 ssize_t proc_pid_read_maps (struct task_struct *task, struct file * file, char * buf,
  596                           size_t count, loff_t *ppos)
  597 {
  598         struct mm_struct *mm;
  599         struct vm_area_struct * map;
  600         char *tmp, *kbuf;
  601         long retval;
  602         int off, lineno, loff;
  603 
  604         /* reject calls with out of range parameters immediately */
  605         retval = 0;
  606         if (*ppos > LONG_MAX)
  607                 goto out;
  608         if (count == 0)
  609                 goto out;
  610         off = (long)*ppos;
  611         /*
  612          * We might sleep getting the page, so get it first.
  613          */
  614         retval = -ENOMEM;
  615         kbuf = (char*)__get_free_page(GFP_KERNEL);
  616         if (!kbuf)
  617                 goto out;
  618 
  619         tmp = (char*)__get_free_page(GFP_KERNEL);
  620         if (!tmp)
  621                 goto out_free1;
  622 
  623         task_lock(task);
  624         mm = task->mm;
  625         if (mm)
  626                 atomic_inc(&mm->mm_users);
  627         task_unlock(task);
  628         retval = 0;
  629         if (!mm)
  630                 goto out_free2;
  631 
  632         down_read(&mm->mmap_sem);
  633         map = mm->mmap;
  634         lineno = 0;
  635         loff = 0;
  636         if (count > PAGE_SIZE)
  637                 count = PAGE_SIZE;
  638         while (map) {
  639                 int len;
  640                 if (off > PAGE_SIZE) {
  641                         off -= PAGE_SIZE;
  642                         goto next;
  643                 }
  644                 len = proc_pid_maps_get_line(tmp, map);
  645                 if (len < 0)
  646                         goto out_unlock;
  647                 len -= off;
  648                 if (len > 0) {
  649                         if (retval+len > count) {
  650                                 /* only partial line transfer possible */
  651                                 len = count - retval;
  652                                 /* save the offset where the next read
  653                                  * must start */
  654                                 loff = len+off;
  655                         }
  656                         memcpy(kbuf+retval, tmp+off, len);
  657                         retval += len;
  658                 }
  659                 off = 0;
  660 next:
  661                 if (!loff)
  662                         lineno++;
  663                 if (retval >= count)
  664                         break;
  665                 if (loff) BUG();
  666                 map = map->vm_next;
  667         }
  668 
  669 out_unlock:
  670         up_read(&mm->mmap_sem);
  671         mmput(mm);
  672 
  673         if (retval > count) BUG();
  674         if (copy_to_user(buf, kbuf, retval))
  675                 retval = -EFAULT;
  676         else
  677                 *ppos = (lineno << PAGE_SHIFT) + loff;
  678 
  679 out_free2:
  680         free_page((unsigned long)tmp);
  681 out_free1:
  682         free_page((unsigned long)kbuf);
  683 out:
  684         return retval;
  685 }
  686 
  687 #ifdef CONFIG_SMP
  688 int proc_pid_cpu(struct task_struct *task, char * buffer)
  689 {
  690         int i, len;
  691 
  692         len = sprintf(buffer,
  693                 "cpu  %lu %lu\n",
  694                 task->times.tms_utime,
  695                 task->times.tms_stime);
  696                 
  697         for (i = 0 ; i < smp_num_cpus; i++)
  698                 len += sprintf(buffer + len, "cpu%d %lu %lu\n",
  699                         i,
  700                         task->per_cpu_utime[cpu_logical_map(i)],
  701                         task->per_cpu_stime[cpu_logical_map(i)]);
  702 
  703         return len;
  704 }
  705 #endif

Cache object: 3c6ae3a52b4984166ba54a4a67c50ec1


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