fs/proc/array.c

   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
  33 #include <linux/types.h>
  34 #include <linux/errno.h>
  35 #include <linux/sched.h>
  36 #include <linux/kernel.h>
  37 #include <linux/kernel_stat.h>
  38 #include <linux/tty.h>
  39 #include <linux/user.h>
  40 #include <linux/a.out.h>
  41 #include <linux/string.h>
  42 #include <linux/mman.h>
  43 #include <linux/proc_fs.h>
  44 #include <linux/ioport.h>
  45 #include <linux/config.h>
  46 #include <linux/mm.h>
  47 #include <linux/pagemap.h>
  48 #include <linux/swap.h>
  49 #include <linux/slab.h>
  50 #include <linux/smp.h>
  51 #include <linux/signal.h>
  52
  53 #include <asm/uaccess.h>
  54 #include <asm/pgtable.h>
  55 #include <asm/io.h>
  56
  57 #define LOAD_INT(x) ((x) >> FSHIFT)
  58 #define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
  59
  60 #ifdef CONFIG_DEBUG_MALLOC
  61 int get_malloc(char * buffer);
  62 #endif
  63
  64
  65 static ssize_t read_core(struct file * file, char * buf,
  66                          size_t count, loff_t *ppos)
  67 {
  68         unsigned long p = *ppos, memsize;
  69         ssize_t read;
  70         ssize_t count1;
  71         char * pnt;
  72         struct user dump;
  73 #if defined (__i386__) || defined (__mc68000__)
  74 #       define FIRST_MAPPED     PAGE_SIZE       /* we don't have page 0 mapped on x86.. */
  75 #else
  76 #       define FIRST_MAPPED     0
  77 #endif
  78
  79         memset(&dump, 0, sizeof(struct user));
  80         dump.magic = CMAGIC;
  81         dump.u_dsize = max_mapnr;
  82 #ifdef __alpha__
  83         dump.start_data = PAGE_OFFSET;
  84 #endif
  85
  86         memsize = (max_mapnr + 1) << PAGE_SHIFT;
  87         if (p >= memsize)
  88                 return 0;
  89         if (count > memsize - p)
  90                 count = memsize - p;
  91         read = 0;
  92
  93         if (p < sizeof(struct user) && count > 0) {
  94                 count1 = count;
  95                 if (p + count1 > sizeof(struct user))
  96                         count1 = sizeof(struct user)-p;
  97                 pnt = (char *) &dump + p;
  98                 copy_to_user(buf,(void *) pnt, count1);
  99                 buf += count1;
 100                 p += count1;
 101                 count -= count1;
 102                 read += count1;
 103         }
 104
 105         if (count > 0 && p < PAGE_SIZE + FIRST_MAPPED) {
 106                 count1 = PAGE_SIZE + FIRST_MAPPED - p;
 107                 if (count1 > count)
 108                         count1 = count;
 109                 clear_user(buf, count1);
 110                 buf += count1;
 111                 p += count1;
 112                 count -= count1;
 113                 read += count1;
 114         }
 115         if (count > 0) {
 116                 copy_to_user(buf, (void *) (PAGE_OFFSET+p-PAGE_SIZE), count);
 117                 read += count;
 118         }
 119         *ppos += read;
 120         return read;
 121 }
 122
 123 static struct file_operations proc_kcore_operations = {
 124         NULL,           /* lseek */
 125         read_core,
 126 };
 127
 128 struct inode_operations proc_kcore_inode_operations = {
 129         &proc_kcore_operations,
 130 };
 131
 132 /*
 133  * This function accesses profiling information. The returned data is
 134  * binary: the sampling step and the actual contents of the profile
 135  * buffer. Use of the program readprofile is recommended in order to
 136  * get meaningful info out of these data.
 137  */
 138 static ssize_t read_profile(struct file *file, char *buf,
 139                             size_t count, loff_t *ppos)
 140 {
 141         unsigned long p = *ppos;
 142         ssize_t read;
 143         char * pnt;
 144         unsigned int sample_step = 1 << prof_shift;
 145
 146         if (p >= (prof_len+1)*sizeof(unsigned int))
 147                 return 0;
 148         if (count > (prof_len+1)*sizeof(unsigned int) - p)
 149                 count = (prof_len+1)*sizeof(unsigned int) - p;
 150         read = 0;
 151
 152         while (p < sizeof(unsigned int) && count > 0) {
 153                 put_user(*((char *)(&sample_step)+p),buf);
 154                 buf++; p++; count--; read++;
 155         }
 156         pnt = (char *)prof_buffer + p - sizeof(unsigned int);
 157         copy_to_user(buf,(void *)pnt,count);
 158         read += count;
 159         *ppos += read;
 160         return read;
 161 }
 162
 163 /*
 164  * Writing to /proc/profile resets the counters
 165  *
 166  * Writing a 'profiling multiplier' value into it also re-sets the profiling
 167  * interrupt frequency, on architectures that support this.
 168  */
 169 static ssize_t write_profile(struct file * file, const char * buf,
 170                              size_t count, loff_t *ppos)
 171 {
 172 #ifdef __SMP__
 173         extern int setup_profiling_timer (unsigned int multiplier);
 174
 175         if (count==sizeof(int)) {
 176                 unsigned int multiplier;
 177
 178                 if (copy_from_user(&multiplier, buf, sizeof(int)))
 179                         return -EFAULT;
 180
 181                 if (setup_profiling_timer(multiplier))
 182                         return -EINVAL;
 183         }
 184 #endif
 185
 186         memset(prof_buffer, 0, prof_len * sizeof(*prof_buffer));
 187         return count;
 188 }
 189
 190 static struct file_operations proc_profile_operations = {
 191         NULL,           /* lseek */
 192         read_profile,
 193         write_profile,
 194 };
 195
 196 struct inode_operations proc_profile_inode_operations = {
 197         &proc_profile_operations,
 198 };
 199
 200
 201 static int get_loadavg(char * buffer)
 202 {
 203         int a, b, c;
 204
 205         a = avenrun[0] + (FIXED_1/200);
 206         b = avenrun[1] + (FIXED_1/200);
 207         c = avenrun[2] + (FIXED_1/200);
 208         return sprintf(buffer,"%d.%02d %d.%02d %d.%02d %d/%d %d\n",
 209                 LOAD_INT(a), LOAD_FRAC(a),
 210                 LOAD_INT(b), LOAD_FRAC(b),
 211                 LOAD_INT(c), LOAD_FRAC(c),
 212                 nr_running, nr_tasks, last_pid);
 213 }
 214
 215 static int get_kstat(char * buffer)
 216 {
 217         int i, len;
 218         unsigned sum = 0;
 219         extern unsigned long total_forks;
 220         unsigned long ticks;
 221
 222         ticks = jiffies * smp_num_cpus;
 223         for (i = 0 ; i < NR_IRQS ; i++)
 224                 sum += kstat.interrupts[i];
 225         len = sprintf(buffer,
 226                 "cpu  %u %u %u %lu\n"
 227                 "disk %u %u %u %u\n"
 228                 "disk_rio %u %u %u %u\n"
 229                 "disk_wio %u %u %u %u\n"
 230                 "disk_rblk %u %u %u %u\n"
 231                 "disk_wblk %u %u %u %u\n"
 232                 "page %u %u\n"
 233                 "swap %u %u\n"
 234                 "intr %u",
 235                 kstat.cpu_user,
 236                 kstat.cpu_nice,
 237                 kstat.cpu_system,
 238                 ticks - (kstat.cpu_user + kstat.cpu_nice + kstat.cpu_system),
 239                 kstat.dk_drive[0], kstat.dk_drive[1],
 240                 kstat.dk_drive[2], kstat.dk_drive[3],
 241                 kstat.dk_drive_rio[0], kstat.dk_drive_rio[1],
 242                 kstat.dk_drive_rio[2], kstat.dk_drive_rio[3],
 243                 kstat.dk_drive_wio[0], kstat.dk_drive_wio[1],
 244                 kstat.dk_drive_wio[2], kstat.dk_drive_wio[3],
 245                 kstat.dk_drive_rblk[0], kstat.dk_drive_rblk[1],
 246                 kstat.dk_drive_rblk[2], kstat.dk_drive_rblk[3],
 247                 kstat.dk_drive_wblk[0], kstat.dk_drive_wblk[1],
 248                 kstat.dk_drive_wblk[2], kstat.dk_drive_wblk[3],
 249                 kstat.pgpgin,
 250                 kstat.pgpgout,
 251                 kstat.pswpin,
 252                 kstat.pswpout,
 253                 sum);
 254         for (i = 0 ; i < NR_IRQS ; i++)
 255                 len += sprintf(buffer + len, " %u", kstat.interrupts[i]);
 256         len += sprintf(buffer + len,
 257                 "\nctxt %u\n"
 258                 "btime %lu\n"
 259                 "processes %lu\n",
 260                 kstat.context_swtch,
 261                 xtime.tv_sec - jiffies / HZ,
 262                 total_forks);
 263         return len;
 264 }
 265
 266
 267 static int get_uptime(char * buffer)
 268 {
 269         unsigned long uptime;
 270         unsigned long idle;
 271
 272         uptime = jiffies;
 273         idle = task[0]->times.tms_utime + task[0]->times.tms_stime;
 274
 275         /* The formula for the fraction parts really is ((t * 100) / HZ) % 100, but
 276            that would overflow about every five days at HZ == 100.
 277            Therefore the identity a = (a / b) * b + a % b is used so that it is
 278            calculated as (((t / HZ) * 100) + ((t % HZ) * 100) / HZ) % 100.
 279            The part in front of the '+' always evaluates as 0 (mod 100). All divisions
 280            in the above formulas are truncating. For HZ being a power of 10, the
 281            calculations simplify to the version in the #else part (if the printf
 282            format is adapted to the same number of digits as zeroes in HZ.
 283          */
 284 #if HZ!=100
 285         return sprintf(buffer,"%lu.%02lu %lu.%02lu\n",
 286                 uptime / HZ,
 287                 (((uptime % HZ) * 100) / HZ) % 100,
 288                 idle / HZ,
 289                 (((idle % HZ) * 100) / HZ) % 100);
 290 #else
 291         return sprintf(buffer,"%lu.%02lu %lu.%02lu\n",
 292                 uptime / HZ,
 293                 uptime % HZ,
 294                 idle / HZ,
 295                 idle % HZ);
 296 #endif
 297 }
 298
 299 static int get_meminfo(char * buffer)
 300 {
 301         struct sysinfo i;
 302         int len;
 303
 304         si_meminfo(&i);
 305         si_swapinfo(&i);
 306         len = sprintf(buffer, "        total:    used:    free:  shared: buffers:  cached:\n"
 307                 "Mem:  %8lu %8lu %8lu %8lu %8lu %8lu\n"
 308                 "Swap: %8lu %8lu %8lu\n",
 309                 i.totalram, i.totalram-i.freeram, i.freeram, i.sharedram, i.bufferram, page_cache_size*PAGE_SIZE,
 310                 i.totalswap, i.totalswap-i.freeswap, i.freeswap);
 311         /*
 312          * Tagged format, for easy grepping and expansion. The above will go away
 313          * eventually, once the tools have been updated.
 314          */
 315         return len + sprintf(buffer+len,
 316                 "MemTotal:  %8lu kB\n"
 317                 "MemFree:   %8lu kB\n"
 318                 "MemShared: %8lu kB\n"
 319                 "Buffers:   %8lu kB\n"
 320                 "Cached:    %8lu kB\n"
 321                 "SwapTotal: %8lu kB\n"
 322                 "SwapFree:  %8lu kB\n",
 323                 i.totalram >> 10,
 324                 i.freeram >> 10,
 325                 i.sharedram >> 10,
 326                 i.bufferram >> 10,
 327                 page_cache_size << (PAGE_SHIFT - 10),
 328                 i.totalswap >> 10,
 329                 i.freeswap >> 10);
 330 }
 331
 332 static int get_version(char * buffer)
 333 {
 334         extern char *linux_banner;
 335
 336         strcpy(buffer, linux_banner);
 337         return strlen(buffer);
 338 }
 339
 340 static int get_cmdline(char * buffer)
 341 {
 342         extern char saved_command_line[];
 343
 344         return sprintf(buffer, "%s\n", saved_command_line);
 345 }
 346
 347 static unsigned long get_phys_addr(struct task_struct * p, unsigned long ptr)
 348 {
 349         pgd_t *page_dir;
 350         pmd_t *page_middle;
 351         pte_t pte;
 352
 353         if (!p || !p->mm || ptr >= TASK_SIZE)
 354                 return 0;
 355         /* Check for NULL pgd .. shouldn't happen! */
 356         if (!p->mm->pgd) {
 357                 printk("get_phys_addr: pid %d has NULL pgd!\n", p->pid);
 358                 return 0;
 359         }
 360
 361         page_dir = pgd_offset(p->mm,ptr);
 362         if (pgd_none(*page_dir))
 363                 return 0;
 364         if (pgd_bad(*page_dir)) {
 365                 printk("bad page directory entry %08lx\n", pgd_val(*page_dir));
 366                 pgd_clear(page_dir);
 367                 return 0;
 368         }
 369         page_middle = pmd_offset(page_dir,ptr);
 370         if (pmd_none(*page_middle))
 371                 return 0;
 372         if (pmd_bad(*page_middle)) {
 373                 printk("bad page middle entry %08lx\n", pmd_val(*page_middle));
 374                 pmd_clear(page_middle);
 375                 return 0;
 376         }
 377         pte = *pte_offset(page_middle,ptr);
 378         if (!pte_present(pte))
 379                 return 0;
 380         return pte_page(pte) + (ptr & ~PAGE_MASK);
 381 }
 382
 383 static int get_array(struct task_struct *p, unsigned long start, unsigned long end, char * buffer)
 384 {
 385         unsigned long addr;
 386         int size = 0, result = 0;
 387         char c;
 388
 389         if (start >= end)
 390                 return result;
 391         for (;;) {
 392                 addr = get_phys_addr(p, start);
 393                 if (!addr)
 394                         return result;
 395                 do {
 396                         c = *(char *) addr;
 397                         if (!c)
 398                                 result = size;
 399                         if (size < PAGE_SIZE)
 400                                 buffer[size++] = c;
 401                         else
 402                                 return result;
 403                         addr++;
 404                         start++;
 405                         if (!c && start >= end)
 406                                 return result;
 407                 } while (addr & ~PAGE_MASK);
 408         }
 409         return result;
 410 }
 411
 412 static int get_env(int pid, char * buffer)
 413 {
 414         struct task_struct *p = find_task_by_pid(pid);
 415
 416         if (!p || !p->mm)
 417                 return 0;
 418         return get_array(p, p->mm->env_start, p->mm->env_end, buffer);
 419 }
 420
 421 static int get_arg(int pid, char * buffer)
 422 {
 423         struct task_struct *p = find_task_by_pid(pid);
 424
 425         if (!p || !p->mm)
 426                 return 0;
 427         return get_array(p, p->mm->arg_start, p->mm->arg_end, buffer);
 428 }
 429
 430 /*
 431  * These bracket the sleeping functions..
 432  */
 433 extern void scheduling_functions_start_here(void);
 434 extern void scheduling_functions_end_here(void);
 435 #define first_sched     ((unsigned long) scheduling_functions_start_here)
 436 #define last_sched      ((unsigned long) scheduling_functions_end_here)
 437
 438 static unsigned long get_wchan(struct task_struct *p)
 439 {
 440         if (!p || p == current || p->state == TASK_RUNNING)
 441                 return 0;
 442 #if defined(__i386__)
 443         {
 444                 unsigned long ebp, eip;
 445                 unsigned long stack_page;
 446                 int count = 0;
 447
 448                 stack_page = 4096 + (unsigned long)p;
 449                 if (!stack_page)
 450                         return 0;
 451                 ebp = p->tss.ebp;
 452                 do {
 453                         if (ebp < stack_page || ebp >= 4092+stack_page)
 454                                 return 0;
 455                         eip = *(unsigned long *) (ebp+4);
 456                         if (eip < first_sched || eip >= last_sched)
 457                                 return eip;
 458                         ebp = *(unsigned long *) ebp;
 459                 } while (count++ < 16);
 460         }
 461 #elif defined(__alpha__)
 462         /*
 463          * This one depends on the frame size of schedule().  Do a
 464          * "disass schedule" in gdb to find the frame size.  Also, the
 465          * code assumes that sleep_on() follows immediately after
 466          * interruptible_sleep_on() and that add_timer() follows
 467          * immediately after interruptible_sleep().  Ugly, isn't it?
 468          * Maybe adding a wchan field to task_struct would be better,
 469          * after all...
 470          */
 471         {
 472             unsigned long schedule_frame;
 473             unsigned long pc;
 474
 475             pc = thread_saved_pc(&p->tss);
 476             if (pc >= first_sched && pc < last_sched) {
 477                 schedule_frame = ((unsigned long *)p->tss.ksp)[6];
 478                 return ((unsigned long *)schedule_frame)[12];
 479             }
 480             return pc;
 481         }
 482 #elif defined(__mc68000__)
 483         {
 484             unsigned long fp, pc;
 485             unsigned long stack_page;
 486             int count = 0;
 487             extern int sys_pause (void);
 488
 489             stack_page = p->kernel_stack_page;
 490             if (!stack_page)
 491                     return 0;
 492             fp = ((struct switch_stack *)p->tss.ksp)->a6;
 493             do {
 494                     if (fp < stack_page || fp >= 4088+stack_page)
 495                             return 0;
 496                     pc = ((unsigned long *)fp)[1];
 497                 /* FIXME: This depends on the order of these functions. */
 498                     if (pc < first_sched || pc >= last_sched)
 499                       return pc;
 500                     fp = *(unsigned long *) fp;
 501             } while (count++ < 16);
 502         }
 503 #elif defined(__powerpc__)
 504         return (p->tss.wchan);
 505 #endif
 506         return 0;
 507 }
 508
 509 #if defined(__i386__)
 510 # define KSTK_EIP(tsk)  (((unsigned long *)(4096+(unsigned long)(tsk)))[1019])
 511 # define KSTK_ESP(tsk)  (((unsigned long *)(4096+(unsigned long)(tsk)))[1022])
 512 #elif defined(__alpha__)
 513   /*
 514    * See arch/alpha/kernel/ptrace.c for details.
 515    */
 516 # define PT_REG(reg)            (PAGE_SIZE - sizeof(struct pt_regs)     \
 517                                  + (long)&((struct pt_regs *)0)->reg)
 518 # define KSTK_EIP(tsk) \
 519     (*(unsigned long *)(PT_REG(pc) + PAGE_SIZE + (unsigned long)(tsk)))
 520 # define KSTK_ESP(tsk)  ((tsk) == current ? rdusp() : (tsk)->tss.usp)
 521 #elif defined(__mc68000__)
 522 #define KSTK_EIP(tsk)   \
 523     ({                  \
 524         unsigned long eip = 0;   \
 525         if ((tsk)->tss.esp0 > PAGE_SIZE && \
 526             MAP_NR((tsk)->tss.esp0) < max_mapnr) \
 527               eip = ((struct pt_regs *) (tsk)->tss.esp0)->pc;    \
 528         eip; })
 529 #define KSTK_ESP(tsk)   ((tsk) == current ? rdusp() : (tsk)->tss.usp)
 530 #elif defined(__powerpc__)
 531 #define KSTK_EIP(tsk)   ((tsk)->tss.regs->nip)
 532 #define KSTK_ESP(tsk)   ((tsk)->tss.regs->gpr[1])
 533 #elif defined (__sparc_v9__)
 534 # define KSTK_EIP(tsk)  ((tsk)->tss.kregs->tpc)
 535 # define KSTK_ESP(tsk)  ((tsk)->tss.kregs->u_regs[UREG_FP])
 536 #elif defined(__sparc__)
 537 # define KSTK_EIP(tsk)  ((tsk)->tss.kregs->pc)
 538 # define KSTK_ESP(tsk)  ((tsk)->tss.kregs->u_regs[UREG_FP])
 539 #endif
 540
 541 /* Gcc optimizes away "strlen(x)" for constant x */
 542 #define ADDBUF(buffer, string) \
 543 do { memcpy(buffer, string, strlen(string)); \
 544      buffer += strlen(string); } while (0)
 545
 546 static inline char * task_name(struct task_struct *p, char * buf)
 547 {
 548         int i;
 549         char * name;
 550
 551         ADDBUF(buf, "Name:\t");
 552         name = p->comm;
 553         i = sizeof(p->comm);
 554         do {
 555                 unsigned char c = *name;
 556                 name++;
 557                 i--;
 558                 *buf = c;
 559                 if (!c)
 560                         break;
 561                 if (c == '\\') {
 562                         buf[1] = c;
 563                         buf += 2;
 564                         continue;
 565                 }
 566                 if (c == '\n') {
 567                         buf[0] = '\\';
 568                         buf[1] = 'n';
 569                         buf += 2;
 570                         continue;
 571                 }
 572                 buf++;
 573         } while (i);
 574         *buf = '\n';
 575         return buf+1;
 576 }
 577
 578 static inline char * task_state(struct task_struct *p, char *buffer)
 579 {
 580 #define NR_STATES (sizeof(states)/sizeof(const char *))
 581         unsigned int n = p->state;
 582         static const char * states[] = {
 583                 "R (running)",
 584                 "S (sleeping)",
 585                 "D (disk sleep)",
 586                 "Z (zombie)",
 587                 "T (stopped)",
 588                 "W (paging)",
 589                 ". Huh?"
 590         };
 591
 592         if (n >= NR_STATES)
 593                 n = NR_STATES-1;
 594
 595         buffer += sprintf(buffer,
 596                 "State:\t%s\n"
 597                 "Pid:\t%d\n"
 598                 "PPid:\t%d\n"
 599                 "Uid:\t%d\t%d\t%d\t%d\n"
 600                 "Gid:\t%d\t%d\t%d\t%d\n",
 601                 states[n],
 602                 p->pid, p->p_pptr->pid,
 603                 p->uid, p->euid, p->suid, p->fsuid,
 604                 p->gid, p->egid, p->sgid, p->fsgid);
 605         return buffer;
 606 }
 607
 608 static inline char * task_mem(struct task_struct *p, char *buffer)
 609 {
 610         struct mm_struct * mm = p->mm;
 611
 612         if (mm && mm != &init_mm) {
 613                 struct vm_area_struct * vma = mm->mmap;
 614                 unsigned long data = 0, stack = 0;
 615                 unsigned long exec = 0, lib = 0;
 616
 617                 for (vma = mm->mmap; vma; vma = vma->vm_next) {
 618                         unsigned long len = (vma->vm_end - vma->vm_start) >> 10;
 619                         if (!vma->vm_dentry) {
 620                                 data += len;
 621                                 if (vma->vm_flags & VM_GROWSDOWN)
 622                                         stack += len;
 623                                 continue;
 624                         }
 625                         if (vma->vm_flags & VM_WRITE)
 626                                 continue;
 627                         if (vma->vm_flags & VM_EXEC) {
 628                                 exec += len;
 629                                 if (vma->vm_flags & VM_EXECUTABLE)
 630                                         continue;
 631                                 lib += len;
 632                         }
 633                 }
 634                 buffer += sprintf(buffer,
 635                         "VmSize:\t%8lu kB\n"
 636                         "VmLck:\t%8lu kB\n"
 637                         "VmRSS:\t%8lu kB\n"
 638                         "VmData:\t%8lu kB\n"
 639                         "VmStk:\t%8lu kB\n"
 640                         "VmExe:\t%8lu kB\n"
 641                         "VmLib:\t%8lu kB\n",
 642                         mm->total_vm << (PAGE_SHIFT-10),
 643                         mm->locked_vm << (PAGE_SHIFT-10),
 644                         mm->rss << (PAGE_SHIFT-10),
 645                         data - stack, stack,
 646                         exec - lib, lib);
 647         }
 648         return buffer;
 649 }
 650
 651 char * render_sigset_t(sigset_t *set, char *buffer)
 652 {
 653         int i = _NSIG, x;
 654         do {
 655                 i -= 4, x = 0;
 656                 if (sigismember(set, i+1)) x |= 1;
 657                 if (sigismember(set, i+2)) x |= 2;
 658                 if (sigismember(set, i+3)) x |= 4;
 659                 if (sigismember(set, i+4)) x |= 8;
 660                 *buffer++ = (x < 10 ? '0' : 'a' - 10) + x;
 661         } while (i >= 4);
 662         *buffer = 0;
 663         return buffer;
 664 }
 665
 666 static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *ign,
 667                                     sigset_t *catch)
 668 {
 669         struct k_sigaction *k;
 670         int i;
 671
 672         sigemptyset(ign);
 673         sigemptyset(catch);
 674
 675         if (p->sig) {
 676                 k = p->sig->action;
 677                 for (i = 1; i <= _NSIG; ++i, ++k) {
 678                         if (k->sa.sa_handler == SIG_IGN)
 679                                 sigaddset(ign, i);
 680                         else if (k->sa.sa_handler != SIG_DFL)
 681                                 sigaddset(catch, i);
 682                 }
 683         }
 684 }
 685
 686 static inline char * task_sig(struct task_struct *p, char *buffer)
 687 {
 688         sigset_t ign, catch;
 689
 690         buffer += sprintf(buffer, "SigPnd:\t");
 691         buffer = render_sigset_t(&p->signal, buffer);
 692         *buffer++ = '\n';
 693         buffer += sprintf(buffer, "SigBlk:\t");
 694         buffer = render_sigset_t(&p->blocked, buffer);
 695         *buffer++ = '\n';
 696
 697         collect_sigign_sigcatch(p, &ign, &catch);
 698         buffer += sprintf(buffer, "SigIgn:\t");
 699         buffer = render_sigset_t(&ign, buffer);
 700         *buffer++ = '\n';
 701         buffer += sprintf(buffer, "SigCat:\t");
 702         buffer = render_sigset_t(&catch, buffer);
 703         *buffer++ = '\n';
 704
 705         return buffer;
 706 }
 707
 708 static int get_status(int pid, char * buffer)
 709 {
 710         char * orig = buffer;
 711         struct task_struct *tsk = find_task_by_pid(pid);
 712
 713         if (!tsk)
 714                 return 0;
 715         buffer = task_name(tsk, buffer);
 716         buffer = task_state(tsk, buffer);
 717         buffer = task_mem(tsk, buffer);
 718         buffer = task_sig(tsk, buffer);
 719         return buffer - orig;
 720 }
 721
 722 static int get_stat(int pid, char * buffer)
 723 {
 724         struct task_struct *tsk = find_task_by_pid(pid);
 725         unsigned long vsize, eip, esp, wchan;
 726         long priority, nice;
 727         int tty_pgrp;
 728         sigset_t sigign, sigcatch;
 729         char signal_str[sizeof(sigset_t)*2+1];
 730         char blocked_str[sizeof(sigset_t)*2+1];
 731         char sigign_str[sizeof(sigset_t)*2+1];
 732         char sigcatch_str[sizeof(sigset_t)*2+1];
 733         char state;
 734
 735         if (!tsk)
 736                 return 0;
 737         if (tsk->state < 0 || tsk->state > 5)
 738                 state = '.';
 739         else
 740                 state = "RSDZTW"[tsk->state];
 741         vsize = eip = esp = 0;
 742         if (tsk->mm && tsk->mm != &init_mm) {
 743                 struct vm_area_struct *vma = tsk->mm->mmap;
 744                 while (vma) {
 745                         vsize += vma->vm_end - vma->vm_start;
 746                         vma = vma->vm_next;
 747                 }
 748                 eip = KSTK_EIP(tsk);
 749                 esp = KSTK_ESP(tsk);
 750         }
 751
 752         wchan = get_wchan(tsk);
 753
 754         collect_sigign_sigcatch(tsk, &sigign, &sigcatch);
 755         render_sigset_t(&tsk->signal, signal_str);
 756         render_sigset_t(&tsk->blocked, blocked_str);
 757         render_sigset_t(&sigign, sigign_str);
 758         render_sigset_t(&sigcatch, sigcatch_str);
 759
 760         if (tsk->tty)
 761                 tty_pgrp = tsk->tty->pgrp;
 762         else
 763                 tty_pgrp = -1;
 764
 765         /* scale priority and nice values from timeslices to -20..20 */
 766         /* to make it look like a "normal" unix priority/nice value  */
 767         priority = tsk->counter;
 768         priority = 20 - (priority * 10 + DEF_PRIORITY / 2) / DEF_PRIORITY;
 769         nice = tsk->priority;
 770         nice = 20 - (nice * 20 + DEF_PRIORITY / 2) / DEF_PRIORITY;
 771
 772         return sprintf(buffer,"%d (%s) %c %d %d %d %d %d %lu %lu \
 773 %lu %lu %lu %lu %lu %ld %ld %ld %ld %ld %ld %lu %lu %ld %lu %lu %lu %lu %lu \
 774 %lu %s %s %s %s %lu %lu %lu\n",
 775                 pid,
 776                 tsk->comm,
 777                 state,
 778                 tsk->p_pptr->pid,
 779                 tsk->pgrp,
 780                 tsk->session,
 781                 tsk->tty ? kdev_t_to_nr(tsk->tty->device) : 0,
 782                 tty_pgrp,
 783                 tsk->flags,
 784                 tsk->min_flt,
 785                 tsk->cmin_flt,
 786                 tsk->maj_flt,
 787                 tsk->cmaj_flt,
 788                 tsk->times.tms_utime,
 789                 tsk->times.tms_stime,
 790                 tsk->times.tms_cutime,
 791                 tsk->times.tms_cstime,
 792                 priority,
 793                 nice,
 794                 tsk->timeout,
 795                 tsk->it_real_value,
 796                 tsk->start_time,
 797                 vsize,
 798                 tsk->mm ? tsk->mm->rss : 0, /* you might want to shift this left 3 */
 799                 tsk->rlim ? tsk->rlim[RLIMIT_RSS].rlim_cur : 0,
 800                 tsk->mm ? tsk->mm->start_code : 0,
 801                 tsk->mm ? tsk->mm->end_code : 0,
 802                 tsk->mm ? tsk->mm->start_stack : 0,
 803                 esp,
 804                 eip,
 805                 signal_str,
 806                 blocked_str,
 807                 sigign_str,
 808                 sigcatch_str,
 809                 wchan,
 810                 tsk->nswap,
 811                 tsk->cnswap);
 812 }
 813
 814 static inline void statm_pte_range(pmd_t * pmd, unsigned long address, unsigned long size,
 815         int * pages, int * shared, int * dirty, int * total)
 816 {
 817         pte_t * pte;
 818         unsigned long end;
 819
 820         if (pmd_none(*pmd))
 821                 return;
 822         if (pmd_bad(*pmd)) {
 823                 printk("statm_pte_range: bad pmd (%08lx)\n", pmd_val(*pmd));
 824                 pmd_clear(pmd);
 825                 return;
 826         }
 827         pte = pte_offset(pmd, address);
 828         address &= ~PMD_MASK;
 829         end = address + size;
 830         if (end > PMD_SIZE)
 831                 end = PMD_SIZE;
 832         do {
 833                 pte_t page = *pte;
 834
 835                 address += PAGE_SIZE;
 836                 pte++;
 837                 if (pte_none(page))
 838                         continue;
 839                 ++*total;
 840                 if (!pte_present(page))
 841                         continue;
 842                 ++*pages;
 843                 if (pte_dirty(page))
 844                         ++*dirty;
 845                 if (MAP_NR(pte_page(page)) >= max_mapnr)
 846                         continue;
 847                 if (atomic_read(&mem_map[MAP_NR(pte_page(page))].count) > 1)
 848                         ++*shared;
 849         } while (address < end);
 850 }
 851
 852 static inline void statm_pmd_range(pgd_t * pgd, unsigned long address, unsigned long size,
 853         int * pages, int * shared, int * dirty, int * total)
 854 {
 855         pmd_t * pmd;
 856         unsigned long end;
 857
 858         if (pgd_none(*pgd))
 859                 return;
 860         if (pgd_bad(*pgd)) {
 861                 printk("statm_pmd_range: bad pgd (%08lx)\n", pgd_val(*pgd));
 862                 pgd_clear(pgd);
 863                 return;
 864         }
 865         pmd = pmd_offset(pgd, address);
 866         address &= ~PGDIR_MASK;
 867         end = address + size;
 868         if (end > PGDIR_SIZE)
 869                 end = PGDIR_SIZE;
 870         do {
 871                 statm_pte_range(pmd, address, end - address, pages, shared, dirty, total);
 872                 address = (address + PMD_SIZE) & PMD_MASK;
 873                 pmd++;
 874         } while (address < end);
 875 }
 876
 877 static void statm_pgd_range(pgd_t * pgd, unsigned long address, unsigned long end,
 878         int * pages, int * shared, int * dirty, int * total)
 879 {
 880         while (address < end) {
 881                 statm_pmd_range(pgd, address, end - address, pages, shared, dirty, total);
 882                 address = (address + PGDIR_SIZE) & PGDIR_MASK;
 883                 pgd++;
 884         }
 885 }
 886
 887 static int get_statm(int pid, char * buffer)
 888 {
 889         struct task_struct *tsk = find_task_by_pid(pid);
 890         int size=0, resident=0, share=0, trs=0, lrs=0, drs=0, dt=0;
 891
 892         if (!tsk)
 893                 return 0;
 894         if (tsk->mm && tsk->mm != &init_mm) {
 895                 struct vm_area_struct * vma = tsk->mm->mmap;
 896
 897                 while (vma) {
 898                         pgd_t *pgd = pgd_offset(tsk->mm, vma->vm_start);
 899                         int pages = 0, shared = 0, dirty = 0, total = 0;
 900
 901                         statm_pgd_range(pgd, vma->vm_start, vma->vm_end, &pages, &shared, &dirty, &total);
 902                         resident += pages;
 903                         share += shared;
 904                         dt += dirty;
 905                         size += total;
 906                         if (vma->vm_flags & VM_EXECUTABLE)
 907                                 trs += pages;   /* text */
 908                         else if (vma->vm_flags & VM_GROWSDOWN)
 909                                 drs += pages;   /* stack */
 910                         else if (vma->vm_end > 0x60000000)
 911                                 lrs += pages;   /* library */
 912                         else
 913                                 drs += pages;
 914                         vma = vma->vm_next;
 915                 }
 916         }
 917         return sprintf(buffer,"%d %d %d %d %d %d %d\n",
 918                        size, resident, share, trs, lrs, drs, dt);
 919 }
 920
 921 /*
 922  * The way we support synthetic files > 4K
 923  * - without storing their contents in some buffer and
 924  * - without walking through the entire synthetic file until we reach the
 925  *   position of the requested data
 926  * is to cleverly encode the current position in the file's f_pos field.
 927  * There is no requirement that a read() call which returns `count' bytes
 928  * of data increases f_pos by exactly `count'.
 929  *
 930  * This idea is Linus' one. Bruno implemented it.
 931  */
 932
 933 /*
 934  * For the /proc/<pid>/maps file, we use fixed length records, each containing
 935  * a single line.
 936  */
 937 #define MAPS_LINE_LENGTH        4096
 938 #define MAPS_LINE_SHIFT         12
 939 /*
 940  * f_pos = (number of the vma in the task->mm->mmap list) * MAPS_LINE_LENGTH
 941  *         + (index into the line)
 942  */
 943 /* for systems with sizeof(void*) == 4: */
 944 #define MAPS_LINE_FORMAT4         "%08lx-%08lx %s %08lx %s %lu"
 945 #define MAPS_LINE_MAX4  49 /* sum of 8  1  8  1 4 1 8 1 5 1 10 1 */
 946
 947 /* for systems with sizeof(void*) == 8: */
 948 #define MAPS_LINE_FORMAT8         "%016lx-%016lx %s %016lx %s %lu"
 949 #define MAPS_LINE_MAX8  73 /* sum of 16  1  16  1 4 1 16 1 5 1 10 1 */
 950
 951 #define MAPS_LINE_MAX   MAPS_LINE_MAX8
 952
 953
 954 static ssize_t read_maps (int pid, struct file * file, char * buf,
 955                           size_t count, loff_t *ppos)
 956 {
 957         struct task_struct *p;
 958         struct vm_area_struct * map, * next;
 959         char * destptr = buf, * buffer;
 960         loff_t lineno;
 961         ssize_t column, i;
 962         int volatile_task;
 963         long retval;
 964
 965         /*
 966          * We might sleep getting the page, so get it first.
 967          */
 968         retval = -ENOMEM;
 969         buffer = (char*)__get_free_page(GFP_KERNEL);
 970         if (!buffer)
 971                 goto out;
 972
 973         retval = -EINVAL;
 974         p = find_task_by_pid(pid);
 975         if (!p)
 976                 goto freepage_out;
 977
 978         if (!p->mm || p->mm == &init_mm || count == 0)
 979                 goto getlen_out;
 980
 981         /* Check whether the mmaps could change if we sleep */
 982         volatile_task = (p != current || p->mm->count > 1);
 983
 984         /* decode f_pos */
 985         lineno = *ppos >> MAPS_LINE_SHIFT;
 986         column = *ppos & (MAPS_LINE_LENGTH-1);
 987
 988         /* quickly go to line lineno */
 989         for (map = p->mm->mmap, i = 0; map && (i < lineno); map = map->vm_next, i++)
 990                 continue;
 991
 992         for ( ; map ; map = next ) {
 993                 /* produce the next line */
 994                 char *line;
 995                 char str[5], *cp = str;
 996                 int flags;
 997                 kdev_t dev;
 998                 unsigned long ino;
 999                 int maxlen = (sizeof(void*) == 4) ?
1000                         MAPS_LINE_MAX4 :  MAPS_LINE_MAX8;
1001                 int len;
1002
1003                 /*
1004                  * Get the next vma now (but it won't be used if we sleep).
1005                  */
1006                 next = map->vm_next;
1007                 flags = map->vm_flags;
1008
1009                 *cp++ = flags & VM_READ ? 'r' : '-';
1010                 *cp++ = flags & VM_WRITE ? 'w' : '-';
1011                 *cp++ = flags & VM_EXEC ? 'x' : '-';
1012                 *cp++ = flags & VM_MAYSHARE ? 's' : 'p';
1013                 *cp++ = 0;
1014
1015                 dev = 0;
1016                 ino = 0;
1017                 if (map->vm_dentry != NULL) {
1018                         dev = map->vm_dentry->d_inode->i_dev;
1019                         ino = map->vm_dentry->d_inode->i_ino;
1020                         line = d_path(map->vm_dentry, buffer, PAGE_SIZE);
1021                         buffer[PAGE_SIZE-1] = '\n';
1022                         line -= maxlen;
1023                         if(line < buffer)
1024                                 line = buffer;
1025                 } else
1026                         line = buffer;
1027
1028                 len = sprintf(line,
1029                               sizeof(void*) == 4 ? MAPS_LINE_FORMAT4 : MAPS_LINE_FORMAT8,
1030                               map->vm_start, map->vm_end, str, map->vm_offset,
1031                               kdevname(dev), ino);
1032
1033                 if(map->vm_dentry) {
1034                         for(i = len; i < maxlen; i++)
1035                                 line[i] = ' ';
1036                         len = buffer + PAGE_SIZE - line;
1037                 } else
1038                         line[len++] = '\n';
1039                 if (column >= len) {
1040                         column = 0; /* continue with next line at column 0 */
1041                         lineno++;
1042                         continue; /* we haven't slept */
1043                 }
1044
1045                 i = len-column;
1046                 if (i > count)
1047                         i = count;
1048                 copy_to_user(destptr, line+column, i); /* may have slept */
1049                 destptr += i;
1050                 count   -= i;
1051                 column  += i;
1052                 if (column >= len) {
1053                         column = 0; /* next time: next line at column 0 */
1054                         lineno++;
1055                 }
1056
1057                 /* done? */
1058                 if (count == 0)
1059                         break;
1060
1061                 /* By writing to user space, we might have slept.
1062                  * Stop the loop, to avoid a race condition.
1063                  */
1064                 if (volatile_task)
1065                         break;
1066         }
1067
1068         /* encode f_pos */
1069         *ppos = (lineno << MAPS_LINE_SHIFT) + column;
1070
1071 getlen_out:
1072         retval = destptr - buf;
1073
1074 freepage_out:
1075         free_page((unsigned long)buffer);
1076 out:
1077         return retval;
1078 }
1079
1080 #ifdef CONFIG_MODULES
1081 extern int get_module_list(char *);
1082 extern int get_ksyms_list(char *, char **, off_t, int);
1083 #endif
1084 extern int get_device_list(char *);
1085 extern int get_filesystem_list(char *);
1086 extern int get_filesystem_info( char * );
1087 extern int get_irq_list(char *);
1088 extern int get_dma_list(char *);
1089 extern int get_cpuinfo(char *);
1090 extern int get_pci_list(char*);
1091 extern int get_md_status (char *);
1092 extern int get_rtc_status (char *);
1093 extern int get_locks_status (char *, char **, off_t, int);
1094 extern int get_swaparea_info (char *);
1095 #ifdef __SMP_PROF__
1096 extern int get_smp_prof_list(char *);
1097 #endif
1098 #ifdef CONFIG_ZORRO
1099 extern int zorro_get_list(char *);
1100 #endif
1101 #if defined (CONFIG_AMIGA) || defined (CONFIG_ATARI)
1102 extern int get_hardware_list(char *);
1103 #endif
1104
1105 static long get_root_array(char * page, int type, char **start,
1106         off_t offset, unsigned long length)
1107 {
1108         switch (type) {
1109                 case PROC_LOADAVG:
1110                         return get_loadavg(page);
1111
1112                 case PROC_UPTIME:
1113                         return get_uptime(page);
1114
1115                 case PROC_MEMINFO:
1116                         return get_meminfo(page);
1117
1118 #ifdef CONFIG_PCI
1119                 case PROC_PCI:
1120                         return get_pci_list(page);
1121 #endif
1122
1123                 case PROC_CPUINFO:
1124                         return get_cpuinfo(page);
1125
1126                 case PROC_VERSION:
1127                         return get_version(page);
1128
1129 #ifdef CONFIG_DEBUG_MALLOC
1130                 case PROC_MALLOC:
1131                         return get_malloc(page);
1132 #endif
1133
1134 #ifdef CONFIG_MODULES
1135                 case PROC_MODULES:
1136                         return get_module_list(page);
1137
1138                 case PROC_KSYMS:
1139                         return get_ksyms_list(page, start, offset, length);
1140 #endif
1141
1142                 case PROC_STAT:
1143                         return get_kstat(page);
1144
1145                 case PROC_SLABINFO:
1146                         return get_slabinfo(page);
1147
1148                 case PROC_DEVICES:
1149                         return get_device_list(page);
1150
1151                 case PROC_INTERRUPTS:
1152                         return get_irq_list(page);
1153
1154                 case PROC_FILESYSTEMS:
1155                         return get_filesystem_list(page);
1156
1157                 case PROC_DMA:
1158                         return get_dma_list(page);
1159
1160                 case PROC_IOPORTS:
1161                         return get_ioport_list(page);
1162 #ifdef CONFIG_BLK_DEV_MD
1163                 case PROC_MD:
1164                         return get_md_status(page);
1165 #endif
1166 #ifdef __SMP_PROF__
1167                 case PROC_SMP_PROF:
1168                         return get_smp_prof_list(page);
1169 #endif
1170                 case PROC_CMDLINE:
1171                         return get_cmdline(page);
1172
1173                 case PROC_MTAB:
1174                        return get_filesystem_info( page );
1175
1176                 case PROC_SWAP:
1177                        return get_swaparea_info(page);
1178 #ifdef CONFIG_RTC
1179                 case PROC_RTC:
1180                         return get_rtc_status(page);
1181 #endif
1182                 case PROC_LOCKS:
1183                         return get_locks_status(page, start, offset, length);
1184 #ifdef CONFIG_ZORRO
1185                 case PROC_ZORRO:
1186                         return zorro_get_list(page);
1187 #endif
1188 #if defined (CONFIG_AMIGA) || defined (CONFIG_ATARI)
1189                 case PROC_HARDWARE:
1190                         return get_hardware_list(page);
1191 #endif
1192         }
1193         return -EBADF;
1194 }
1195
1196 static int get_process_array(char * page, int pid, int type)
1197 {
1198         switch (type) {
1199                 case PROC_PID_STATUS:
1200                         return get_status(pid, page);
1201                 case PROC_PID_ENVIRON:
1202                         return get_env(pid, page);
1203                 case PROC_PID_CMDLINE:
1204                         return get_arg(pid, page);
1205                 case PROC_PID_STAT:
1206                         return get_stat(pid, page);
1207                 case PROC_PID_STATM:
1208                         return get_statm(pid, page);
1209         }
1210         return -EBADF;
1211 }
1212
1213
1214 static inline int fill_array(char * page, int pid, int type, char **start, off_t offset, int length)
1215 {
1216         if (pid)
1217                 return get_process_array(page, pid, type);
1218         return get_root_array(page, type, start, offset, length);
1219 }
1220
1221 #define PROC_BLOCK_SIZE (3*1024)                /* 4K page size but our output routines use some slack for overruns */
1222
1223 static ssize_t array_read(struct file * file, char * buf,
1224                           size_t count, loff_t *ppos)
1225 {
1226         struct inode * inode = file->f_dentry->d_inode;
1227         unsigned long page;
1228         char *start;
1229         ssize_t length;
1230         ssize_t end;
1231         unsigned int type, pid;
1232         struct proc_dir_entry *dp;
1233
1234         if (count > PROC_BLOCK_SIZE)
1235                 count = PROC_BLOCK_SIZE;
1236         if (!(page = __get_free_page(GFP_KERNEL)))
1237                 return -ENOMEM;
1238         type = inode->i_ino;
1239         pid = type >> 16;
1240         type &= 0x0000ffff;
1241         start = NULL;
1242         dp = (struct proc_dir_entry *) inode->u.generic_ip;
1243         if (dp->get_info)
1244                 length = dp->get_info((char *)page, &start, *ppos,
1245                                       count, 0);
1246         else
1247                 length = fill_array((char *) page, pid, type,
1248                                     &start, *ppos, count);
1249         if (length < 0) {
1250                 free_page(page);
1251                 return length;
1252         }
1253         if (start != NULL) {
1254                 /* We have had block-adjusting processing! */
1255                 copy_to_user(buf, start, length);
1256                 *ppos += length;
1257                 count = length;
1258         } else {
1259                 /* Static 4kB (or whatever) block capacity */
1260                 if (*ppos >= length) {
1261                         free_page(page);
1262                         return 0;
1263                 }
1264                 if (count + *ppos > length)
1265                         count = length - *ppos;
1266                 end = count + *ppos;
1267                 copy_to_user(buf, (char *) page + *ppos, count);
1268                 *ppos = end;
1269         }
1270         free_page(page);
1271         return count;
1272 }
1273
1274 static struct file_operations proc_array_operations = {
1275         NULL,           /* array_lseek */
1276         array_read,
1277         NULL,           /* array_write */
1278         NULL,           /* array_readdir */
1279         NULL,           /* array_poll */
1280         NULL,           /* array_ioctl */
1281         NULL,           /* mmap */
1282         NULL,           /* no special open code */
1283         NULL,           /* no special release code */
1284         NULL            /* can't fsync */
1285 };
1286
1287 struct inode_operations proc_array_inode_operations = {
1288         &proc_array_operations, /* default base directory file-ops */
1289         NULL,                   /* create */
1290         NULL,                   /* lookup */
1291         NULL,                   /* link */
1292         NULL,                   /* unlink */
1293         NULL,                   /* symlink */
1294         NULL,                   /* mkdir */
1295         NULL,                   /* rmdir */
1296         NULL,                   /* mknod */
1297         NULL,                   /* rename */
1298         NULL,                   /* readlink */
1299         NULL,                   /* follow_link */
1300         NULL,                   /* readpage */
1301         NULL,                   /* writepage */
1302         NULL,                   /* bmap */
1303         NULL,                   /* truncate */
1304         NULL                    /* permission */
1305 };
1306
1307 static ssize_t arraylong_read(struct file * file, char * buf,
1308                               size_t count, loff_t *ppos)
1309 {
1310         struct inode * inode = file->f_dentry->d_inode;
1311         unsigned int pid = inode->i_ino >> 16;
1312         unsigned int type = inode->i_ino & 0x0000ffff;
1313
1314         switch (type) {
1315                 case PROC_PID_MAPS:
1316                         return read_maps(pid, file, buf, count, ppos);
1317         }
1318         return -EINVAL;
1319 }
1320
1321 static struct file_operations proc_arraylong_operations = {
1322         NULL,           /* array_lseek */
1323         arraylong_read,
1324         NULL,           /* array_write */
1325         NULL,           /* array_readdir */
1326         NULL,           /* array_poll */
1327         NULL,           /* array_ioctl */
1328         NULL,           /* mmap */
1329         NULL,           /* no special open code */
1330         NULL,           /* no special release code */
1331         NULL            /* can't fsync */
1332 };
1333
1334 struct inode_operations proc_arraylong_inode_operations = {
1335         &proc_arraylong_operations,     /* default base directory file-ops */
1336         NULL,                   /* create */
1337         NULL,                   /* lookup */
1338         NULL,                   /* link */
1339         NULL,                   /* unlink */
1340         NULL,                   /* symlink */
1341         NULL,                   /* mkdir */
1342         NULL,                   /* rmdir */
1343         NULL,                   /* mknod */
1344         NULL,                   /* rename */
1345         NULL,                   /* readlink */
1346         NULL,                   /* follow_link */
1347         NULL,                   /* readpage */
1348         NULL,                   /* writepage */
1349         NULL,                   /* bmap */
1350         NULL,                   /* truncate */
1351         NULL                    /* permission */
1352 };