libcfs/include/libcfs/libcfs.h

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2011, 2017, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  */
  32
  33 #ifndef __LIBCFS_LIBCFS_H__
  34 #define __LIBCFS_LIBCFS_H__
  35
  36 #include <linux/kernel.h>
  37 #include <linux/module.h>
  38 #include <linux/workqueue.h>
  39
  40 #include <libcfs/linux/linux-misc.h>
  41 #include <libcfs/linux/linux-time.h>
  42 #include <libcfs/linux/linux-wait.h>
  43
  44 #include <uapi/linux/lnet/libcfs_ioctl.h>
  45 #include <libcfs/libcfs_debug.h>
  46 #include <libcfs/libcfs_private.h>
  47 #include <libcfs/bitmap.h>
  48 #include <libcfs/libcfs_cpu.h>
  49 #include <libcfs/libcfs_prim.h>
  50 #include <libcfs/libcfs_string.h>
  51 #include <libcfs/libcfs_workitem.h>
  52 #include <libcfs/libcfs_hash.h>
  53 #include <libcfs/libcfs_heap.h>
  54 #include <libcfs/libcfs_fail.h>
  55 #include "curproc.h"
  56
  57 #define LIBCFS_VERSION  "0.7.1"
  58
  59 #define PO2_ROUNDUP_TYPED(x, po2, type) (-(-(type)(x) & -(type)(po2)))
  60 #define LOWEST_BIT_SET(x) ((x) & ~((x) - 1))
  61
  62 /* Sparse annotations */
  63 #if !defined(__must_hold)
  64 # ifdef __CHECKER__
  65 #  define __must_hold(x) __attribute__((context(x, 1, 1)))
  66 # else  /* __CHECKER__ */
  67 #  define __must_hold(x)
  68 # endif /* !__CHECKER__ */
  69 #endif /* !__must_hold */
  70
  71 #ifdef HAVE_TOTALRAM_PAGES_AS_FUNC
  72  #ifndef cfs_totalram_pages
  73   #define cfs_totalram_pages() totalram_pages()
  74  #endif
  75 #else
  76  #ifndef cfs_totalram_pages
  77   #define cfs_totalram_pages() totalram_pages
  78  #endif
  79 #endif
  80
  81 #ifdef HAVE_FORCE_SIG_WITH_TASK
  82 #define cfs_force_sig(sig, task)        force_sig((sig), (task))
  83 #else
  84 #define cfs_force_sig(sig, task)                                        \
  85 do {                                                                    \
  86         unsigned long flags;                                            \
  87                                                                         \
  88         spin_lock_irqsave(&task->sighand->siglock, flags);              \
  89         task->sighand->action[sig - 1].sa.sa_handler = SIG_DFL;         \
  90         send_sig(sig, task, 1);                                         \
  91         spin_unlock_irqrestore(&task->sighand->siglock, flags);         \
  92 } while (0)
  93 #endif
  94
  95 /* need both kernel and user-land acceptor */
  96 #define LNET_ACCEPTOR_MIN_RESERVED_PORT    512
  97 #define LNET_ACCEPTOR_MAX_RESERVED_PORT    1023
  98
  99 extern struct blocking_notifier_head libcfs_ioctl_list;
 100 static inline int notifier_from_ioctl_errno(int err)
 101 {
 102         if (err == -EINVAL)
 103                 return NOTIFY_OK;
 104         return notifier_from_errno(err) | NOTIFY_STOP_MASK;
 105 }
 106
 107 /*
 108  * Defined by platform
 109  */
 110 int unshare_fs_struct(void);
 111 sigset_t cfs_block_sigsinv(unsigned long sigs);
 112 void cfs_restore_sigs(sigset_t);
 113
 114 int libcfs_ioctl_data_adjust(struct libcfs_ioctl_data *data);
 115
 116 #define container_of0(ptr, type, member) container_of_safe(ptr, type, member)
 117
 118 extern struct workqueue_struct *cfs_rehash_wq;
 119
 120 struct lnet_debugfs_symlink_def {
 121         const char *name;
 122         const char *target;
 123 };
 124
 125 void lnet_insert_debugfs(struct ctl_table *table);
 126 void lnet_remove_debugfs(struct ctl_table *table);
 127
 128 /* helper for sysctl handlers */
 129 int lprocfs_call_handler(void *data, int write, loff_t *ppos,
 130                          void __user *buffer, size_t *lenp,
 131                          int (*handler)(void *data, int write, loff_t pos,
 132                                         void __user *buffer, int len));
 133
 134
 135 #define wait_var_event_warning(var, condition, format, ...)             \
 136 do {                                                                    \
 137         int counter = 4;                                                \
 138         might_sleep();                                                  \
 139         if (condition)                                                  \
 140                 break;                                                  \
 141         ___wait_var_event(var, condition, TASK_UNINTERRUPTIBLE, 0, 0,   \
 142                           if (schedule_timeout(cfs_time_seconds(1)) == 0)\
 143                                   CDEBUG(is_power_of_2(counter++) ?     \
 144                                          D_WARNING : D_NET,             \
 145                                          format, ## __VA_ARGS__)        \
 146                 );                                                      \
 147 } while (0)
 148
 149 #endif /* _LIBCFS_LIBCFS_H_ */