- up(&trace_thread_sem);
-}
-
-int trace_write_daemon_file(struct file *file, const char *buffer,
- unsigned long count, void *data)
-{
- char *name;
- unsigned long off;
- int rc;
-
- name = kmalloc(count + 1, GFP_KERNEL);
- if (name == NULL)
- return -ENOMEM;
-
- if (copy_from_user(name, buffer, count)) {
- rc = -EFAULT;
- goto out;
- }
-
- /* be nice and strip out trailing '\n' */
- for (off = count ; off > 2 && isspace(name[off - 1]); off--)
- ;
-
- name[off] = '\0';
-
- down_write(&tracefile_sem);
- if (strcmp(name, "stop") == 0) {
- tracefile = NULL;
- trace_stop_thread();
- goto out_sem;
- } else if (strncmp(name, "size=", 5) == 0) {
- tracefile_size = simple_strtoul(name + 5, NULL, 0);
- if (tracefile_size < 10 || tracefile_size > 20480)
- tracefile_size = TRACEFILE_SIZE;
- else
- tracefile_size <<= 20;
- goto out_sem;
- }
-
- if (name[0] != '/') {
- rc = -EINVAL;
- goto out_sem;
- }
-
- if (tracefile != NULL)
- kfree(tracefile);
-
- tracefile = name;
- name = NULL;
-
- printk(KERN_INFO "Lustre: debug daemon will attempt to start writing "
- "to %s (%lukB max)\n", tracefile, (long)(tracefile_size >> 10));
-
- trace_start_thread();
-
- out_sem:
- up_write(&tracefile_sem);
-
- out:
- kfree(name);
- return count;
-}
-
-int trace_read_daemon_file(char *page, char **start, off_t off, int count,
- int *eof, void *data)
-{
- int rc;
-
- down_read(&tracefile_sem);
- rc = snprintf(page, count, "%s", tracefile);
- up_read(&tracefile_sem);
-
- return rc;
-}
-
-int trace_write_debug_mb(struct file *file, const char *buffer,
- unsigned long count, void *data)
-{
- char string[32];
- int i;
- unsigned max;
-
- if (count >= sizeof(string)) {
- printk(KERN_ERR "Lustre: value too large (length %lu bytes)\n",
- count);
- return -EOVERFLOW;
- }
-
- if (copy_from_user(string, buffer, count))
- return -EFAULT;
-
- max = simple_strtoul(string, NULL, 0);
- if (max == 0)
- return -EINVAL;
-
- if (max > (num_physpages >> (20 - 2 - PAGE_SHIFT)) / 5 || max >= 512) {
- printk(KERN_ERR "Lustre: Refusing to set debug buffer size to "
- "%dMB, which is more than 80%% of available RAM (%lu)\n",
- max, (num_physpages >> (20 - 2 - PAGE_SHIFT)) / 5);
- return -EINVAL;
- }
-
- max /= smp_num_cpus;
-
- for (i = 0; i < NR_CPUS; i++) {
- struct trace_cpu_data *tcd;
- tcd = &trace_data[i].tcd;
- tcd->tcd_max_pages = max << (20 - PAGE_SHIFT);
- }
- return count;
-}
-
-int trace_read_debug_mb(char *page, char **start, off_t off, int count,
- int *eof, void *data)
-{
- struct trace_cpu_data *tcd;
- unsigned long flags;
- int rc;
-
- tcd = trace_get_tcd(flags);
- rc = snprintf(page, count, "%lu\n",
- (tcd->tcd_max_pages >> (20 - PAGE_SHIFT)) * smp_num_cpus);
- trace_put_tcd(tcd, flags);
-
- return rc;