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     rcu_read_lock();
  35
  36 #if defined(for_each_process)
  37     for_each_process(p) if (p->pid) {
  38 #ifdef STRUCT_TASK_STRUCT_HAS_EXIT_STATE
  39         if (p->exit_state)
  40             continue;
  41 #else
  42         if (p->state & TASK_ZOMBIE)
  43             continue;
  44 #endif
  45         afs_GCPAGs_perproc_func(p);
  46     }
  47 #else
  48     for_each_task(p) if (p->pid) {
  49 #ifdef STRUCT_TASK_STRUCT_HAS_EXIT_STATE
  50         if (p->exit_state)
  51             continue;
  52 #else
  53         if (p->state & TASK_ZOMBIE)
  54             continue;
  55 #endif
  56         afs_GCPAGs_perproc_func(p);
  57     }
  58 #endif
  59
  60     rcu_read_unlock();
  61 #endif
  62 }
  63
  64 /* return a pointer (sometimes a static copy ) to the cred for a
  65  * given afs_proc_t.
  66  * subsequent calls may overwrite the previously returned value.
  67  */
  68
  69 #if !defined(LINUX_KEYRING_SUPPORT) && (!defined(STRUCT_TASK_STRUCT_HAS_CRED) || defined(HAVE_LINUX_RCU_READ_LOCK))
  70 const afs_ucred_t *
  71 afs_osi_proc2cred(afs_proc_t * pr)
  72 {
  73     afs_ucred_t *rv = NULL;
  74     static afs_ucred_t cr;
  75
  76     if (pr == NULL) {
  77         return NULL;
  78     }
  79
  80     if ((pr->state == TASK_RUNNING) || (pr->state == TASK_INTERRUPTIBLE)
  81         || (pr->state == TASK_UNINTERRUPTIBLE)
  82         || (pr->state == TASK_STOPPED)) {
  83         /* This is dangerous. If anyone ever crfree's the cred that's
  84          * returned from here, we'll go boom, because it's statically
  85          * allocated. */
  86         atomic_set(&cr.cr_ref, 1);
  87         afs_set_cr_uid(&cr, task_uid(pr));
  88 #if defined(STRUCT_TASK_STRUCT_HAS_CRED)
  89         get_group_info(pr->cred->group_info);
  90         afs_set_cr_group_info(&cr, pr->cred->group_info);
  91 #else
  92         get_group_info(pr->group_info);
  93         afs_set_cr_group_info(&cr, pr->group_info);
  94 #endif
  95         rv = &cr;
  96     }
  97
  98     return rv;
  99 }
 100 #endif
 101
 102 #endif /* AFS_GCPAGS */