LU-13783 libcfs: provide fallback kallsyms_lookup_name()

[fs/lustre-release.git] / libcfs / include / libcfs / linux / linux-misc.h

diff --git a/libcfs/include/libcfs/linux/linux-misc.h b/libcfs/include/libcfs/linux/linux-misc.h
index 1e45e8f..1db78bb 100644 (file)
--- a/libcfs/include/libcfs/linux/linux-misc.h
+++ b/libcfs/include/libcfs/linux/linux-misc.h
@@ -34,6 +34,10 @@
 #define __LIBCFS_LINUX_MISC_H__
 
 #include <linux/fs.h>
+/* Since Commit 2f8b544477e6 ("block,fs: untangle fs.h and blk_types.h")
+ * fs.h doesn't include blk_types.h, but we need it.
+ */
+#include <linux/blk_types.h>
 #include <linux/mutex.h>
 #include <linux/user_namespace.h>
 #include <linux/uio.h>
@@ -54,8 +58,6 @@
 #endif
 #endif /* HAVE_IOV_ITER_TYPE */
 
-int cfs_get_environ(const char *key, char *value, int *val_len);
-
 int cfs_kernel_write(struct file *filp, const void *buf, size_t count,
                     loff_t *pos);
 ssize_t cfs_kernel_read(struct file *file, void *buf, size_t count,
@@ -85,10 +87,70 @@ static inline void kernel_param_lock(struct module *mod)
 }
 #endif /* ! HAVE_KERNEL_PARAM_LOCK */
 
+int cfs_apply_workqueue_attrs(struct workqueue_struct *wq,
+                             const struct workqueue_attrs *attrs);
+
 #ifndef HAVE_KSTRTOBOOL_FROM_USER
 
 #define kstrtobool strtobool
 
 int kstrtobool_from_user(const char __user *s, size_t count, bool *res);
+#endif /* HAVE_KSTRTOBOOL_FROM_USER */
+
+#ifndef HAVE_KREF_READ
+static inline int kref_read(const struct kref *kref)
+{
+       return atomic_read(&kref->refcount);
+}
+#endif /* HAVE_KREF_READ */
+
+#ifdef HAVE_FORCE_SIG_WITH_TASK
+#define cfs_force_sig(sig, task)       force_sig((sig), (task))
+#else
+#define cfs_force_sig(sig, task)                                       \
+do {                                                                   \
+       unsigned long flags;                                            \
+                                                                       \
+       spin_lock_irqsave(&task->sighand->siglock, flags);              \
+       task->sighand->action[sig - 1].sa.sa_handler = SIG_DFL;         \
+       send_sig(sig, task, 1);                                         \
+       spin_unlock_irqrestore(&task->sighand->siglock, flags);         \
+} while (0)
+#endif
+
+void cfs_arch_init(void);
+
+#ifndef container_of_safe
+/**
+ * container_of_safe - cast a member of a structure out to the containing structure
+ * @ptr:       the pointer to the member.
+ * @type:      the type of the container struct this is embedded in.
+ * @member:    the name of the member within the struct.
+ *
+ * If IS_ERR_OR_NULL(ptr), ptr is returned unchanged.
+ *
+ * Note: Copied from Linux 5.6, with BUILD_BUG_ON_MSG section removed.
+ */
+#define container_of_safe(ptr, type, member) ({                                \
+       void *__mptr = (void *)(ptr);                                   \
+       IS_ERR_OR_NULL(__mptr) ? ERR_CAST(__mptr) :                     \
+               ((type *)(__mptr - offsetof(type, member))); })
 #endif
+
+/*
+ * Linux v4.15-rc2-5-g4229a470175b added sizeof_field()
+ * Linux v5.5-rc4-1-g1f07dcc459d5 removed FIELD_SIZEOF()
+ * Proved a sizeof_field in terms of FIELD_SIZEOF() when one is not provided
+ */
+#ifndef sizeof_field
+#define sizeof_field(type, member)     FIELD_SIZEOF(type, member)
 #endif
+
+#ifndef HAVE_KALLSYMS_LOOKUP_NAME
+static inline void *kallsyms_lookup_name(char *func)
+{
+       return NULL;
+}
+#endif
+
+#endif /* __LIBCFS_LINUX_MISC_H__ */