preadv/pwritev: Add preadv and pwritev system calls.
[linux-2.6.git] / fs / read_write.c
index 400fe81..6d5d8ff 100644 (file)
@@ -731,6 +731,56 @@ SYSCALL_DEFINE3(writev, unsigned long, fd, const struct iovec __user *, vec,
        return ret;
 }
 
+SYSCALL_DEFINE5(preadv, unsigned long, fd, const struct iovec __user *, vec,
+               unsigned long, vlen, u32, pos_high, u32, pos_low)
+{
+       loff_t pos = ((loff_t)pos_high << 32) | pos_low;
+       struct file *file;
+       ssize_t ret = -EBADF;
+       int fput_needed;
+
+       if (pos < 0)
+               return -EINVAL;
+
+       file = fget_light(fd, &fput_needed);
+       if (file) {
+               ret = -ESPIPE;
+               if (file->f_mode & FMODE_PREAD)
+                       ret = vfs_readv(file, vec, vlen, &pos);
+               fput_light(file, fput_needed);
+       }
+
+       if (ret > 0)
+               add_rchar(current, ret);
+       inc_syscr(current);
+       return ret;
+}
+
+SYSCALL_DEFINE5(pwritev, unsigned long, fd, const struct iovec __user *, vec,
+               unsigned long, vlen, u32, pos_high, u32, pos_low)
+{
+       loff_t pos = ((loff_t)pos_high << 32) | pos_low;
+       struct file *file;
+       ssize_t ret = -EBADF;
+       int fput_needed;
+
+       if (pos < 0)
+               return -EINVAL;
+
+       file = fget_light(fd, &fput_needed);
+       if (file) {
+               ret = -ESPIPE;
+               if (file->f_mode & FMODE_PWRITE)
+                       ret = vfs_writev(file, vec, vlen, &pos);
+               fput_light(file, fput_needed);
+       }
+
+       if (ret > 0)
+               add_wchar(current, ret);
+       inc_syscw(current);
+       return ret;
+}
+
 static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos,
                           size_t count, loff_t max)
 {