src/afs/LINUX/osi_gcpags.c

   1 /*
   2  * Copyright 2000, International Business Machines Corporation and others.
   3  * All Rights Reserved.
   4  *
   5  * This software has been released under the terms of the IBM Public
   6  * License.  For details, see the LICENSE file in the top-level source
   7  * directory or online at http://www.openafs.org/dl/license10.html
   8  */
   9
  10 #include <afsconfig.h>
  11 #include "afs/param.h"
  12
  13
  14 #include "afs/sysincludes.h"    /* Standard vendor system headers */
  15 #include "afsincludes.h"        /* Afs-based standard headers */
  16 #include "afs/afs_stats.h"      /* afs statistics */
  17
  18 #if AFS_GCPAGS
  19
  20 /* afs_osi_TraverseProcTable() - Walk through the systems process
  21  * table, calling afs_GCPAGs_perproc_func() for each process.
  22  */
  23
  24
  25 #ifdef EXPORTED_TASKLIST_LOCK
  26 extern rwlock_t tasklist_lock __attribute__((weak));
  27 #endif
  28 void
  29 afs_osi_TraverseProcTable(void)
  30 {
  31 #if !defined(LINUX_KEYRING_SUPPORT) && (!defined(STRUCT_TASK_STRUCT_HAS_CRED) || defined(HAVE_LINUX_RCU_READ_LOCK))
  32     struct task_struct *p;
  33
  34 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18) && defined(EXPORTED_TASKLIST_LOCK)
  35     if (&tasklist_lock)
  36         read_lock(&tasklist_lock);
  37 #endif /* EXPORTED_TASKLIST_LOCK */
  38 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
  39 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18) && defined(EXPORTED_TASKLIST_LOCK)
  40     else
  41 #endif /* EXPORTED_TASKLIST_LOCK && LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18) */
  42         rcu_read_lock();
  43 #endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16) */
  44
  45 #if defined(for_each_process)
  46     for_each_process(p) if (p->pid) {
  47 #ifdef STRUCT_TASK_STRUCT_HAS_EXIT_STATE
  48         if (p->exit_state)
  49             continue;
  50 #else
  51         if (p->state & TASK_ZOMBIE)
  52             continue;
  53 #endif
  54         afs_GCPAGs_perproc_func(p);
  55     }
  56 #else
  57     for_each_task(p) if (p->pid) {
  58 #ifdef STRUCT_TASK_STRUCT_HAS_EXIT_STATE
  59         if (p->exit_state)
  60             continue;
  61 #else
  62         if (p->state & TASK_ZOMBIE)
  63             continue;
  64 #endif
  65         afs_GCPAGs_perproc_func(p);
  66     }
  67 #endif
  68 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18) && defined(EXPORTED_TASKLIST_LOCK)
  69     if (&tasklist_lock)
  70         read_unlock(&tasklist_lock);
  71 #endif /* EXPORTED_TASKLIST_LOCK */
  72 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
  73 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18) && defined(EXPORTED_TASKLIST_LOCK)
  74     else
  75 #endif /* EXPORTED_TASKLIST_LOCK && LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18) */
  76         rcu_read_unlock();
  77 #endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16) */
  78 #endif
  79 }
  80
  81 /* return a pointer (sometimes a static copy ) to the cred for a
  82  * given afs_proc_t.
  83  * subsequent calls may overwrite the previously returned value.
  84  */
  85
  86 #if !defined(LINUX_KEYRING_SUPPORT) && (!defined(STRUCT_TASK_STRUCT_HAS_CRED) || defined(HAVE_LINUX_RCU_READ_LOCK))
  87 const afs_ucred_t *
  88 afs_osi_proc2cred(afs_proc_t * pr)
  89 {
  90     afs_ucred_t *rv = NULL;
  91     static afs_ucred_t cr;
  92
  93     if (pr == NULL) {
  94         return NULL;
  95     }
  96
  97     if ((pr->state == TASK_RUNNING) || (pr->state == TASK_INTERRUPTIBLE)
  98         || (pr->state == TASK_UNINTERRUPTIBLE)
  99         || (pr->state == TASK_STOPPED)) {
 100         /* This is dangerous. If anyone ever crfree's the cred that's
 101          * returned from here, we'll go boom, because it's statically
 102          * allocated. */
 103         atomic_set(&cr.cr_ref, 1);
 104         afs_set_cr_uid(&cr, task_uid(pr));
 105 #if defined(STRUCT_TASK_STRUCT_HAS_CRED)
 106         get_group_info(pr->cred->group_info);
 107         afs_set_cr_group_info(&cr, pr->cred->group_info);
 108 #else
 109         get_group_info(pr->group_info);
 110         afs_set_cr_group_info(&cr, pr->group_info);
 111 #endif
 112         rv = &cr;
 113     }
 114
 115     return rv;
 116 }
 117 #endif
 118
 119 #endif /* AFS_GCPAGS */