19 files changed, 64 insertions, 41 deletions

diff --git a/arch/um/drivers/chan_user.c b/arch/um/drivers/chan_user.c
index ee53cf882f42..d226f103462e 100644
--- a/arch/um/drivers/chan_user.c
+++ b/arch/um/drivers/chan_user.c
@@ -85,7 +85,7 @@ static int winch_thread(void *arg)
 
         pty_fd = data->pty_fd;
         pipe_fd = data->pipe_fd;
-        count = os_write_file(pipe_fd, &c, sizeof(c));
+        count = os_write_file_k(pipe_fd, &c, sizeof(c));
         if(count != sizeof(c))
                 printk("winch_thread : failed to write synchronization "
                        "byte, err = %d\n", -count);
@@ -120,7 +120,7 @@ static int winch_thread(void *arg)
          * host - since they are not different kernel threads, we cannot use
          * kernel semaphores. We don't use SysV semaphores because they are
          * persistent. */
-        count = os_read_file(pipe_fd, &c, sizeof(c));
+        count = os_read_file_k(pipe_fd, &c, sizeof(c));
         if(count != sizeof(c))
                 printk("winch_thread : failed to read synchronization byte, "
                        "err = %d\n", -count);
@@ -130,7 +130,7 @@ static int winch_thread(void *arg)
                  * are blocked.*/
                 sigsuspend(&sigs);
 
-                count = os_write_file(pipe_fd, &c, sizeof(c));
+                count = os_write_file_k(pipe_fd, &c, sizeof(c));
                 if(count != sizeof(c))
                         printk("winch_thread : write failed, err = %d\n",
                                -count);
@@ -162,7 +162,7 @@ static int winch_tramp(int fd, struct tty_struct *tty, int *fd_out)
         }
 
         *fd_out = fds[0];
-        n = os_read_file(fds[0], &c, sizeof(c));
+        n = os_read_file_k(fds[0], &c, sizeof(c));
         if(n != sizeof(c)){
                 printk("winch_tramp : failed to read synchronization byte\n");
                 printk("read failed, err = %d\n", -n);
@@ -195,7 +195,7 @@ void register_winch(int fd, struct tty_struct *tty)
                 if(thread > 0){
                         register_winch_irq(thread_fd, fd, thread, tty);
 
-                        count = os_write_file(thread_fd, &c, sizeof(c));
+                        count = os_write_file_k(thread_fd, &c, sizeof(c));
                         if(count != sizeof(c))
                                 printk("register_winch : failed to write "
                                        "synchronization byte, err = %d\n",
diff --git a/arch/um/drivers/daemon_user.c b/arch/um/drivers/daemon_user.c
index b869e3899683..e1fd26c1b728 100644
--- a/arch/um/drivers/daemon_user.c
+++ b/arch/um/drivers/daemon_user.c
@@ -94,7 +94,7 @@ static int connect_to_switch(struct daemon_data *pri)
         req.version = SWITCH_VERSION;
         req.type = REQ_NEW_CONTROL;
         req.sock = *local_addr;
-        n = os_write_file(pri->control, &req, sizeof(req));
+        n = os_write_file_k(pri->control, &req, sizeof(req));
         if(n != sizeof(req)){
                 printk("daemon_open : control setup request failed, err = %d\n",
                        -n);
@@ -102,7 +102,7 @@ static int connect_to_switch(struct daemon_data *pri)
                 goto out_free;
         }
 
-        n = os_read_file(pri->control, sun, sizeof(*sun));
+        n = os_read_file_k(pri->control, sun, sizeof(*sun));
         if(n != sizeof(*sun)){
                 printk("daemon_open : read of data socket failed, err = %d\n",
                        -n);
diff --git a/arch/um/drivers/harddog_user.c b/arch/um/drivers/harddog_user.c
index 5eeecf8917c3..0fbb1615171e 100644
--- a/arch/um/drivers/harddog_user.c
+++ b/arch/um/drivers/harddog_user.c
@@ -79,7 +79,7 @@ int start_watchdog(int *in_fd_ret, int *out_fd_ret, char *sock)
                 goto out_close_out;
         }
 
-        n = os_read_file(in_fds[0], &c, sizeof(c));
+        n = os_read_file_k(in_fds[0], &c, sizeof(c));
         if(n == 0){
                 printk("harddog_open - EOF on watchdog pipe\n");
                 helper_wait(pid);
@@ -118,7 +118,7 @@ int ping_watchdog(int fd)
         int n;
         char c = '\n';
 
-        n = os_write_file(fd, &c, sizeof(c));
+        n = os_write_file_k(fd, &c, sizeof(c));
         if(n != sizeof(c)){
                 printk("ping_watchdog - write failed, err = %d\n", -n);
                 if(n < 0)
diff --git a/arch/um/drivers/hostaudio_kern.c b/arch/um/drivers/hostaudio_kern.c
index 10e08a8c17c3..bd6688ea96de 100644
--- a/arch/um/drivers/hostaudio_kern.c
+++ b/arch/um/drivers/hostaudio_kern.c
@@ -84,7 +84,7 @@ static ssize_t hostaudio_read(struct file *file, char __user *buffer,
         if(kbuf == NULL)
                 return(-ENOMEM);
 
-        err = os_read_file(state->fd, kbuf, count);
+        err = os_read_file_k(state->fd, kbuf, count);
         if(err < 0)
                 goto out;
 
@@ -115,7 +115,7 @@ static ssize_t hostaudio_write(struct file *file, const char __user *buffer,
         if(copy_from_user(kbuf, buffer, count))
                 goto out;
 
-        err = os_write_file(state->fd, kbuf, count);
+        err = os_write_file_k(state->fd, kbuf, count);
         if(err < 0)
                 goto out;
         *ppos += err;
diff --git a/arch/um/drivers/net_user.c b/arch/um/drivers/net_user.c
index 3503cff867c3..2dc57a37e4b7 100644
--- a/arch/um/drivers/net_user.c
+++ b/arch/um/drivers/net_user.c
@@ -63,7 +63,7 @@ void read_output(int fd, char *output, int len)
         }
                 
         *output = '\0';
-        ret = os_read_file(fd, &remain, sizeof(remain));
+        ret = os_read_file_k(fd, &remain, sizeof(remain));
 
         if (ret != sizeof(remain)) {
                 expected = sizeof(remain);
diff --git a/arch/um/drivers/port_kern.c b/arch/um/drivers/port_kern.c
index 1c8efd95c421..75bb40126c2e 100644
--- a/arch/um/drivers/port_kern.c
+++ b/arch/um/drivers/port_kern.c
@@ -113,7 +113,7 @@ static int port_accept(struct port_list *port)
         }
 
         if(atomic_read(&port->wait_count) == 0){
-                os_write_file(fd, NO_WAITER_MSG, sizeof(NO_WAITER_MSG));
+                os_write_file_k(fd, NO_WAITER_MSG, sizeof(NO_WAITER_MSG));
                 printk("No one waiting for port\n");
         }
         list_add(&conn->list, &port->pending);
diff --git a/arch/um/drivers/random.c b/arch/um/drivers/random.c
index e942e836f995..94838f4c1645 100644
--- a/arch/um/drivers/random.c
+++ b/arch/um/drivers/random.c
@@ -44,7 +44,7 @@ static ssize_t rng_dev_read (struct file *filp, char __user *buf, size_t size,
         int n, ret = 0, have_data;
 
         while(size){
-                n = os_read_file(random_fd, &data, sizeof(data));
+                n = os_read_file_k(random_fd, &data, sizeof(data));
                 if(n > 0){
                         have_data = n;
                         while (have_data && size) {
diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c
index 83189e188c3f..6d163c9e2885 100644
--- a/arch/um/drivers/ubd_kern.c
+++ b/arch/um/drivers/ubd_kern.c
@@ -504,7 +504,7 @@ static void ubd_handler(void)
         struct ubd *dev;
         int n;
 
-        n = os_read_file(thread_fd, &req, sizeof(req));
+        n = os_read_file_k(thread_fd, &req, sizeof(req));
         if(n != sizeof(req)){
                 printk(KERN_ERR "Pid %d - spurious interrupt in ubd_handler, "
                        "err = %d\n", os_getpid(), -n);
@@ -1092,8 +1092,7 @@ static void do_ubd_request(request_queue_t *q)
                 err = prepare_request(req, &io_req);
                 if(!err){
                         dev->active = 1;
-                        n = os_write_file(thread_fd, (char *) &io_req,
-                                         sizeof(io_req));
+                        n = os_write_file_k(thread_fd, &io_req, sizeof(io_req));
                         if(n != sizeof(io_req))
                                 printk("write to io thread failed, "
                                        "errno = %d\n", -n);
@@ -1336,8 +1335,8 @@ static int update_bitmap(struct io_thread_req *req)
                 return(1);
         }
 
-        n = os_write_file(req->fds[1], &req->bitmap_words,
-                          sizeof(req->bitmap_words));
+        n = os_write_file_k(req->fds[1], &req->bitmap_words,
+                            sizeof(req->bitmap_words));
         if(n != sizeof(req->bitmap_words)){
                 printk("do_io - bitmap update failed, err = %d fd = %d\n", -n,
                        req->fds[1]);
@@ -1381,7 +1380,7 @@ void do_io(struct io_thread_req *req)
                         do {
                                 buf = &buf[n];
                                 len -= n;
-                                n = os_read_file(req->fds[bit], buf, len);
+                                n = os_read_file_k(req->fds[bit], buf, len);
                                 if (n < 0) {
                                         printk("do_io - read failed, err = %d "
                                                "fd = %d\n", -n, req->fds[bit]);
@@ -1391,7 +1390,7 @@ void do_io(struct io_thread_req *req)
                         } while((n < len) && (n != 0));
                         if (n < len) memset(&buf[n], 0, len - n);
                 } else {
-                        n = os_write_file(req->fds[bit], buf, len);
+                        n = os_write_file_k(req->fds[bit], buf, len);
                         if(n != len){
                                 printk("do_io - write failed err = %d "
                                        "fd = %d\n", -n, req->fds[bit]);
@@ -1421,7 +1420,7 @@ int io_thread(void *arg)
 
         ignore_sigwinch_sig();
         while(1){
-                n = os_read_file(kernel_fd, &req, sizeof(req));
+                n = os_read_file_k(kernel_fd, &req, sizeof(req));
                 if(n != sizeof(req)){
                         if(n < 0)
                                 printk("io_thread - read failed, fd = %d, "
@@ -1434,7 +1433,7 @@ int io_thread(void *arg)
                 }
                 io_count++;
                 do_io(&req);
-                n = os_write_file(kernel_fd, &req, sizeof(req));
+                n = os_write_file_k(kernel_fd, &req, sizeof(req));
                 if(n != sizeof(req))
                         printk("io_thread - write failed, fd = %d, err = %d\n",
                                kernel_fd, -n);
diff --git a/arch/um/include/os.h b/arch/um/include/os.h
index 394adcded0bf..b463170a5308 100644
--- a/arch/um/include/os.h
+++ b/arch/um/include/os.h
@@ -144,7 +144,9 @@ extern int os_mode_fd(int fd, int mode);
 extern int os_seek_file(int fd, __u64 offset);
 extern int os_open_file(char *file, struct openflags flags, int mode);
 extern int os_read_file(int fd, void *buf, int len);
+extern int os_read_file_k(int fd, void *buf, int len);
 extern int os_write_file(int fd, const void *buf, int count);
+extern int os_write_file_k(int fd, const void *buf, int len);
 extern int os_file_size(char *file, unsigned long long *size_out);
 extern int os_file_modtime(char *file, unsigned long *modtime);
 extern int os_pipe(int *fd, int stream, int close_on_exec);
diff --git a/arch/um/kernel/ksyms.c b/arch/um/kernel/ksyms.c
index 7b3e53fb8070..7c158448b9fd 100644
--- a/arch/um/kernel/ksyms.c
+++ b/arch/um/kernel/ksyms.c
@@ -62,7 +62,9 @@ EXPORT_SYMBOL(os_get_exec_close);
 EXPORT_SYMBOL(os_set_exec_close);
 EXPORT_SYMBOL(os_getpid);
 EXPORT_SYMBOL(os_open_file);
+EXPORT_SYMBOL(os_read_file_k);
 EXPORT_SYMBOL(os_read_file);
+EXPORT_SYMBOL(os_write_file_k);
 EXPORT_SYMBOL(os_write_file);
 EXPORT_SYMBOL(os_seek_file);
 EXPORT_SYMBOL(os_lock_file);
diff --git a/arch/um/kernel/physmem.c b/arch/um/kernel/physmem.c
index df1ad3ba130c..a9856209006b 100644
--- a/arch/um/kernel/physmem.c
+++ b/arch/um/kernel/physmem.c
@@ -341,7 +341,7 @@ void setup_physmem(unsigned long start, unsigned long reserve_end,
          * from physmem_fd, so it needs to be written out there.
          */
         os_seek_file(physmem_fd, __pa(&__syscall_stub_start));
-        os_write_file(physmem_fd, &__syscall_stub_start, PAGE_SIZE);
+        os_write_file_k(physmem_fd, &__syscall_stub_start, PAGE_SIZE);
 
         bootmap_size = init_bootmem(pfn, pfn + delta);
         free_bootmem(__pa(reserve_end) + bootmap_size,
diff --git a/arch/um/kernel/sigio.c b/arch/um/kernel/sigio.c
index 89f9866a1354..f756e78085e4 100644
--- a/arch/um/kernel/sigio.c
+++ b/arch/um/kernel/sigio.c
@@ -21,7 +21,7 @@ static irqreturn_t sigio_interrupt(int irq, void *data)
 {
         char c;
 
-        os_read_file(sigio_irq_fd, &c, sizeof(c));
+        os_read_file_k(sigio_irq_fd, &c, sizeof(c));
         reactivate_fd(sigio_irq_fd, SIGIO_WRITE_IRQ);
         return IRQ_HANDLED;
 }
diff --git a/arch/um/kernel/smp.c b/arch/um/kernel/smp.c
index 62dd093cbcd7..47b690893c06 100644
--- a/arch/um/kernel/smp.c
+++ b/arch/um/kernel/smp.c
@@ -47,7 +47,7 @@ struct task_struct *idle_threads[NR_CPUS];
 
 void smp_send_reschedule(int cpu)
 {
-        os_write_file(cpu_data[cpu].ipi_pipe[1], "R", 1);
+        os_write_file_k(cpu_data[cpu].ipi_pipe[1], "R", 1);
         num_reschedules_sent++;
 }
 
@@ -59,7 +59,7 @@ void smp_send_stop(void)
         for(i = 0; i < num_online_cpus(); i++){
                 if(i == current_thread->cpu)
                         continue;
-                os_write_file(cpu_data[i].ipi_pipe[1], "S", 1);
+                os_write_file_k(cpu_data[i].ipi_pipe[1], "S", 1);
         }
         printk("done\n");
 }
@@ -108,8 +108,8 @@ static struct task_struct *idle_thread(int cpu)
                           { .pid =      new_task->thread.mode.tt.extern_pid,
                             .task =     new_task } );
         idle_threads[cpu] = new_task;
-        CHOOSE_MODE(os_write_file(new_task->thread.mode.tt.switch_pipe[1], &c,
-                          sizeof(c)),
+        CHOOSE_MODE(os_write_file_k(new_task->thread.mode.tt.switch_pipe[1], &c,
+                                    sizeof(c)),
                     ({ panic("skas mode doesn't support SMP"); }));
         return(new_task);
 }
@@ -179,7 +179,7 @@ void IPI_handler(int cpu)
         int fd;
 
         fd = cpu_data[cpu].ipi_pipe[0];
-        while (os_read_file(fd, &c, 1) == 1) {
+        while (os_read_file_k(fd, &c, 1) == 1) {
                 switch (c) {
                 case 'C':
                         smp_call_function_slave(cpu);
@@ -239,7 +239,7 @@ int smp_call_function(void (*_func)(void *info), void *_info, int nonatomic,
         info = _info;
 
         for_each_online_cpu(i)
-                os_write_file(cpu_data[i].ipi_pipe[1], "C", 1);
+                os_write_file_k(cpu_data[i].ipi_pipe[1], "C", 1);
 
         while (atomic_read(&scf_started) != cpus)
                 barrier();
diff --git a/arch/um/kernel/tt/process_kern.c b/arch/um/kernel/tt/process_kern.c
index 8029f72afaa7..c81bd2074930 100644
--- a/arch/um/kernel/tt/process_kern.c
+++ b/arch/um/kernel/tt/process_kern.c
@@ -57,14 +57,15 @@ void switch_to_tt(void *prev, void *next)
          * nor the value in "to" (since it was the task which stole us the CPU,
          * which we don't care about). */
 
-        err = os_write_file(to->thread.mode.tt.switch_pipe[1], &c, sizeof(c));
+        err = os_write_file_k(to->thread.mode.tt.switch_pipe[1], &c, sizeof(c));
         if(err != sizeof(c))
                 panic("write of switch_pipe failed, err = %d", -err);
 
         if(from->thread.mode.tt.switch_pipe[0] == -1)
                 os_kill_process(os_getpid(), 0);
 
-        err = os_read_file(from->thread.mode.tt.switch_pipe[0], &c, sizeof(c));
+        err = os_read_file_k(from->thread.mode.tt.switch_pipe[0], &c,
+                             sizeof(c));
         if(err != sizeof(c))
                 panic("read of switch_pipe failed, errno = %d", -err);
 
@@ -113,7 +114,7 @@ void suspend_new_thread(int fd)
         char c;
 
         os_stop_process(os_getpid());
-        err = os_read_file(fd, &c, sizeof(c));
+        err = os_read_file_k(fd, &c, sizeof(c));
         if(err != sizeof(c))
                 panic("read failed in suspend_new_thread, err = %d", -err);
 }
diff --git a/arch/um/kernel/tt/ptproxy/proxy.c b/arch/um/kernel/tt/ptproxy/proxy.c
index c88e7b5d8a76..007beb6b7c00 100644
--- a/arch/um/kernel/tt/ptproxy/proxy.c
+++ b/arch/um/kernel/tt/ptproxy/proxy.c
@@ -338,13 +338,14 @@ int start_debugger(char *prog, int startup, int stop, int *fd_out)
                                "err = %d\n", -fd);
                         exit(1);
                 }
-                os_write_file(fd, gdb_init_string, sizeof(gdb_init_string) - 1);
+                os_write_file_k(fd, gdb_init_string,
+                                sizeof(gdb_init_string) - 1);
                 if(startup){
                         if(stop){
-                                os_write_file(fd, "b start_kernel\n",
-                                      strlen("b start_kernel\n"));
+                                os_write_file_k(fd, "b start_kernel\n",
+                                                strlen("b start_kernel\n"));
                         }
-                        os_write_file(fd, "c\n", strlen("c\n"));
+                        os_write_file_k(fd, "c\n", strlen("c\n"));
                 }
                 if(ptrace(PTRACE_TRACEME, 0, 0, 0) < 0){
                         printk("start_debugger :  PTRACE_TRACEME failed, "
diff --git a/arch/um/kernel/tt/tracer.c b/arch/um/kernel/tt/tracer.c
index c23588393f6e..264da6c5a5c3 100644
--- a/arch/um/kernel/tt/tracer.c
+++ b/arch/um/kernel/tt/tracer.c
@@ -44,7 +44,7 @@ static void tracer_winch_handler(int sig)
         int n;
         char c = 1;
 
-        n = os_write_file(tracer_winch[1], &c, sizeof(c));
+        n = os_write_file_k(tracer_winch[1], &c, sizeof(c));
         if(n != sizeof(c))
                 printk("tracer_winch_handler - write failed, err = %d\n", -n);
 }
diff --git a/arch/um/os-Linux/file.c b/arch/um/os-Linux/file.c
index 4a9510c67622..5e9b8dcf34d4 100644
--- a/arch/um/os-Linux/file.c
+++ b/arch/um/os-Linux/file.c
@@ -334,12 +334,30 @@ int os_read_file(int fd, void *buf, int len)
                        copy_from_user_proc);
 }
 
+int os_read_file_k(int fd, void *buf, int len)
+{
+        int n = read(fd, buf, len);
+
+        if(n < 0)
+                return -errno;
+        return n;
+}
+
 int os_write_file(int fd, const void *buf, int len)
 {
         return file_io(fd, (void *) buf, len,
                        (int (*)(int, void *, int)) write, copy_to_user_proc);
 }
 
+int os_write_file_k(int fd, const void *buf, int len)
+{
+        int n = write(fd, (void *) buf, len);
+
+        if(n < 0)
+                return -errno;
+        return n;
+}
+
 int os_file_size(char *file, unsigned long long *size_out)
 {
         struct uml_stat buf;
diff --git a/arch/um/sys-i386/bugs.c b/arch/um/sys-i386/bugs.c
index 0393e44813e7..74fd062b201b 100644
--- a/arch/um/sys-i386/bugs.c
+++ b/arch/um/sys-i386/bugs.c
@@ -67,7 +67,7 @@ static int find_cpuinfo_line(int fd, char *key, char *scratch, int len)
                         return 1;
 
                 do {
-                        n = os_read_file(fd, &c, sizeof(c));
+                        n = os_read_file_k(fd, &c, sizeof(c));
                         if(n != sizeof(c)){
                                 printk("Failed to find newline in "
                                        "/proc/cpuinfo, err = %d\n", -n);
diff --git a/arch/um/sys-i386/ldt.c b/arch/um/sys-i386/ldt.c
index a939a7ef0227..d031a13bd969 100644
--- a/arch/um/sys-i386/ldt.c
+++ b/arch/um/sys-i386/ldt.c
@@ -517,7 +517,7 @@ long init_new_ldt(struct mmu_context_skas * new_mm,
                                               .u        =
                                               { .copy_segments =
                                                         from_mm->id.u.mm_fd } } );
-                i = os_write_file(new_mm->id.u.mm_fd, &copy, sizeof(copy));
+                i = os_write_file_k(new_mm->id.u.mm_fd, &copy, sizeof(copy));
                 if(i != sizeof(copy))
                         printk("new_mm : /proc/mm copy_segments failed, "
                                "err = %d\n", -i);