LU-13783 libcfs: provide fallback kallsyms_lookup_name()

[fs/lustre-release.git] / libcfs / libcfs / linux / linux-prim.c

diff --git a/libcfs/libcfs/linux/linux-prim.c b/libcfs/libcfs/linux/linux-prim.c
index d9fd96b..0940c80 100644 (file)
--- a/libcfs/libcfs/linux/linux-prim.c
+++ b/libcfs/libcfs/linux/linux-prim.c
@@ -31,22 +31,24 @@
  */
 
 #define DEBUG_SUBSYSTEM S_LNET
+
+#include <linux/kallsyms.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/fs.h>
-#include <linux/fs_struct.h>
 #include <linux/sched.h>
 #ifdef HAVE_SCHED_HEADERS
-#include <linux/sched/signal.h>
 #include <linux/sched/mm.h>
 #endif
 #include <linux/uaccess.h>
-#include <libcfs/libcfs.h>
 
 #if defined(CONFIG_KGDB)
 #include <asm/kgdb.h>
 #endif
 
+#include <libcfs/linux/linux-time.h>
+#include <libcfs/linux/linux-wait.h>
+
 #ifndef HAVE_KTIME_GET_TS64
 void ktime_get_ts64(struct timespec64 *ts)
 {
@@ -101,6 +103,35 @@ time64_t ktime_get_seconds(void)
 EXPORT_SYMBOL(ktime_get_seconds);
 #endif /* HAVE_KTIME_GET_SECONDS */
 
+static int (*cfs_apply_workqueue_attrs_t)(struct workqueue_struct *wq,
+                                         const struct workqueue_attrs *attrs);
+
+int cfs_apply_workqueue_attrs(struct workqueue_struct *wq,
+                             const struct workqueue_attrs *attrs)
+{
+       if (cfs_apply_workqueue_attrs_t)
+               return cfs_apply_workqueue_attrs_t(wq, attrs);
+       return 0;
+}
+EXPORT_SYMBOL_GPL(cfs_apply_workqueue_attrs);
+
+#ifndef HAVE_XARRAY_SUPPORT
+struct kmem_cache (*radix_tree_node_cachep);
+#endif
+
+void __init cfs_arch_init(void)
+{
+#ifndef HAVE_WAIT_VAR_EVENT
+       wait_bit_init();
+#endif
+       cfs_apply_workqueue_attrs_t =
+               (void *)kallsyms_lookup_name("apply_workqueue_attrs");
+#ifndef HAVE_XARRAY_SUPPORT
+       radix_tree_node_cachep =
+               (void *)kallsyms_lookup_name("radix_tree_node_cachep");
+#endif
+}
+
 int cfs_kernel_write(struct file *filp, const void *buf, size_t count,
                     loff_t *pos)
 {
@@ -110,7 +141,7 @@ int cfs_kernel_write(struct file *filp, const void *buf, size_t count,
        mm_segment_t __old_fs = get_fs();
        int rc;
 
-       set_fs(get_ds());
+       set_fs(KERNEL_DS);
        rc = vfs_write(filp, (__force const char __user *)buf, count, pos);
        set_fs(__old_fs);
 
@@ -119,6 +150,20 @@ int cfs_kernel_write(struct file *filp, const void *buf, size_t count,
 }
 EXPORT_SYMBOL(cfs_kernel_write);
 
+ssize_t cfs_kernel_read(struct file *file, void *buf, size_t count, loff_t *pos)
+{
+#ifdef HAVE_KERNEL_READ_LAST_POSP
+       return kernel_read(file, buf, count, pos);
+#else
+       ssize_t size = kernel_read(file, *pos, buf, count);
+
+       if (size > 0)
+               *pos += size;
+       return size;
+#endif
+}
+EXPORT_SYMBOL(cfs_kernel_read);
+
 #ifndef HAVE_KSET_FIND_OBJ
 struct kobject *kset_find_obj(struct kset *kset, const char *name)
 {
@@ -155,70 +200,3 @@ int kstrtobool_from_user(const char __user *s, size_t count, bool *res)
 }
 EXPORT_SYMBOL(kstrtobool_from_user);
 #endif /* !HAVE_KSTRTOBOOL_FROM_USER */
-
-sigset_t
-cfs_block_allsigs(void)
-{
-       unsigned long   flags;
-       sigset_t        old;
-
-       spin_lock_irqsave(&current->sighand->siglock, flags);
-       old = current->blocked;
-       sigfillset(&current->blocked);
-       recalc_sigpending();
-       spin_unlock_irqrestore(&current->sighand->siglock, flags);
-       return old;
-}
-EXPORT_SYMBOL(cfs_block_allsigs);
-
-sigset_t cfs_block_sigs(unsigned long sigs)
-{
-       unsigned long  flags;
-       sigset_t        old;
-
-       spin_lock_irqsave(&current->sighand->siglock, flags);
-       old = current->blocked;
-       sigaddsetmask(&current->blocked, sigs);
-       recalc_sigpending();
-       spin_unlock_irqrestore(&current->sighand->siglock, flags);
-       return old;
-}
-EXPORT_SYMBOL(cfs_block_sigs);
-
-/* Block all signals except for the @sigs */
-sigset_t cfs_block_sigsinv(unsigned long sigs)
-{
-       unsigned long flags;
-       sigset_t old;
-
-       spin_lock_irqsave(&current->sighand->siglock, flags);
-       old = current->blocked;
-       sigaddsetmask(&current->blocked, ~sigs);
-       recalc_sigpending();
-       spin_unlock_irqrestore(&current->sighand->siglock, flags);
-       return old;
-}
-EXPORT_SYMBOL(cfs_block_sigsinv);
-
-void
-cfs_restore_sigs(sigset_t old)
-{
-       unsigned long  flags;
-
-       spin_lock_irqsave(&current->sighand->siglock, flags);
-       current->blocked = old;
-       recalc_sigpending();
-       spin_unlock_irqrestore(&current->sighand->siglock, flags);
-}
-EXPORT_SYMBOL(cfs_restore_sigs);
-
-void
-cfs_clear_sigpending(void)
-{
-       unsigned long flags;
-
-       spin_lock_irqsave(&current->sighand->siglock, flags);
-       clear_tsk_thread_flag(current, TIF_SIGPENDING);
-       spin_unlock_irqrestore(&current->sighand->siglock, flags);
-}
-EXPORT_SYMBOL(cfs_clear_sigpending);