/* XXX move things up to the top, comment */
union trace_data_union trace_data[NR_CPUS] __cacheline_aligned;
-char *tracefile = NULL;
+char tracefile[TRACEFILE_NAME_SIZE];
int64_t tracefile_size = TRACEFILE_SIZE;
static struct tracefiled_ctl trace_tctl;
struct semaphore trace_thread_sem;
}
}
-int trace_dk(struct file *file, const char *buffer, unsigned long count,
- void *data)
+int trace_copyin_string(char *knl_buffer, int knl_buffer_nob,
+ const char *usr_buffer, int usr_buffer_nob)
{
- char *name;
- unsigned long off;
- int rc;
+ int nob;
+
+ if (usr_buffer_nob > knl_buffer_nob)
+ return -EOVERFLOW;
+
+ if (copy_from_user((void *)knl_buffer,
+ (void *)usr_buffer, usr_buffer_nob))
+ return -EFAULT;
+
+ nob = strnlen(knl_buffer, usr_buffer_nob);
+ while (nob-- >= 0) /* strip trailing whitespace */
+ if (!isspace(knl_buffer[nob]))
+ break;
+
+ if (nob < 0) /* empty string */
+ return -EINVAL;
+
+ if (nob == knl_buffer_nob) /* no space to terminate */
+ return -EOVERFLOW;
+
+ knl_buffer[nob + 1] = 0; /* terminate */
+ return 0;
+}
+
+int trace_copyout_string(char *usr_buffer, int usr_buffer_nob,
+ const char *knl_buffer, char *append)
+{
+ /* NB if 'append' != NULL, it's a single character to append to the
+ * copied out string - usually "\n", for /proc entries and "" (i.e. a
+ * terminating zero byte) for sysctl entries */
+ int nob = strlen(knl_buffer);
+
+ if (nob > usr_buffer_nob)
+ nob = usr_buffer_nob;
+
+ if (copy_to_user(usr_buffer, knl_buffer, nob))
+ return -EFAULT;
+
+ if (append != NULL && nob < usr_buffer_nob) {
+ if (copy_to_user(usr_buffer + nob, append, 1))
+ return -EFAULT;
+
+ nob++;
+ }
+
+ return nob;
+}
- name = cfs_alloc(count + 1, CFS_ALLOC_STD);
- if (name == NULL)
+int trace_allocate_string_buffer(char **str, int nob)
+{
+ if (nob > 2 * CFS_PAGE_SIZE) /* string must be "sensible" */
+ return -EINVAL;
+
+ *str = cfs_alloc(nob, CFS_ALLOC_STD | CFS_ALLOC_ZERO);
+ if (*str == NULL)
return -ENOMEM;
- if (copy_from_user((void *)name, (void *)buffer, count)) {
- rc = -EFAULT;
+ return 0;
+}
+
+void trace_free_string_buffer(char *str, int nob)
+{
+ cfs_free(str);
+}
+
+int trace_dump_debug_buffer_usrstr(void *usr_str, int usr_str_nob)
+{
+ char *str;
+ int rc;
+
+ rc = trace_allocate_string_buffer(&str, usr_str_nob + 1);
+ if (rc != 0)
+ return rc;
+
+ rc = trace_copyin_string(str, usr_str_nob + 1,
+ usr_str, usr_str_nob);
+ if (rc != 0)
goto out;
- }
#if !defined(__WINNT__)
- if (name[0] != '/') {
+ if (str[0] != '/') {
rc = -EINVAL;
goto out;
}
#endif
+ rc = tracefile_dump_all_pages(str);
+out:
+ trace_free_string_buffer(str, usr_str_nob + 1);
+ return rc;
+}
+
+int trace_daemon_command(char *str)
+{
+ int rc = 0;
+
+ tracefile_write_lock();
+
+ if (strcmp(str, "stop") == 0) {
+ trace_stop_thread();
+ memset(tracefile, 0, sizeof(tracefile));
+
+ } else if (strncmp(str, "size=", 5) == 0) {
+ tracefile_size = simple_strtoul(str + 5, NULL, 0);
+ if (tracefile_size < 10 || tracefile_size > 20480)
+ tracefile_size = TRACEFILE_SIZE;
+ else
+ tracefile_size <<= 20;
+
+ } else if (strlen(str) >= sizeof(tracefile)) {
+ rc = -ENAMETOOLONG;
+#ifndef __WINNT__
+ } else if (str[0] != '/') {
+ rc = -EINVAL;
+#endif
+ } else {
+ strcpy(tracefile, str);
- /* be nice and strip out trailing '\n' */
- for (off = count ; off > 2 && isspace(name[off - 1]); off--)
- ;
+ printk(KERN_INFO "Lustre: debug daemon will attempt to start writing "
+ "to %s (%lukB max)\n", tracefile,
+ (long)(tracefile_size >> 10));
- name[off] = '\0';
- rc = tracefile_dump_all_pages(name);
-out:
- if (name)
- cfs_free(name);
- return count;
+ trace_start_thread();
+ }
+
+ tracefile_write_unlock();
+ return rc;
+}
+
+int trace_daemon_command_usrstr(void *usr_str, int usr_str_nob)
+{
+ char *str;
+ int rc;
+
+ rc = trace_allocate_string_buffer(&str, usr_str_nob + 1);
+ if (rc != 0)
+ return rc;
+
+ rc = trace_copyin_string(str, usr_str_nob + 1,
+ usr_str, usr_str_nob);
+ if (rc == 0)
+ rc = trace_daemon_command(str);
+
+ trace_free_string_buffer(str, usr_str_nob + 1);
+ return rc;
+}
+
+int trace_set_debug_mb(int mb)
+{
+ int i;
+ int limit = trace_max_debug_mb();
+
+ if (mb <= 0)
+ return -EINVAL;
+
+ if (mb > limit) {
+ printk(KERN_ERR "Lustre: Refusing to set debug buffer size to "
+ "%dMB - limit is %d\n", mb, limit);
+ return -EINVAL;
+ }
+
+ mb /= smp_num_cpus;
+
+ tracefile_write_lock();
+
+ for (i = 0; i < NR_CPUS; i++) {
+ struct trace_cpu_data *tcd = &trace_data[i].tcd;
+
+ tcd->tcd_max_pages = mb << (20 - CFS_PAGE_SHIFT);
+ }
+
+ tracefile_write_unlock();
+
+ return 0;
+}
+
+int trace_set_debug_mb_usrstr(void *usr_str, int usr_str_nob)
+{
+ char str[32];
+ int rc;
+
+ rc = trace_copyin_string(str, sizeof(str), usr_str, usr_str_nob);
+ if (rc < 0)
+ return rc;
+
+ return trace_set_debug_mb(simple_strtoul(str, NULL, 0));
+}
+
+int trace_get_debug_mb(void)
+{
+ int i;
+ int total_pages = 0;
+
+ tracefile_read_lock();
+
+ for (i = 0; i < NR_CPUS; i++) {
+ struct trace_cpu_data *tcd = &trace_data[i].tcd;
+
+ total_pages += tcd->tcd_max_pages;
+ }
+
+ tracefile_read_unlock();
+
+ return total_pages >> (20 - CFS_PAGE_SHIFT);
}
-EXPORT_SYMBOL(trace_dk);
static int tracefiled(void *arg)
{
filp = NULL;
tracefile_read_lock();
- if (tracefile != NULL) {
+ if (tracefile[0] != 0) {
filp = cfs_filp_open(tracefile,
O_CREAT | O_RDWR | O_LARGEFILE,
0600, &rc);
if (!(filp))
- printk("couldn't open %s: %d\n", tracefile, rc);
+ printk(KERN_WARNING "couldn't open %s: %d\n",
+ tracefile, rc);
}
tracefile_read_unlock();
if (filp == NULL) {
mutex_down(&trace_thread_sem);
if (thread_running) {
- printk(KERN_INFO "Shutting down debug daemon thread...\n");
+ printk(KERN_INFO "Lustre: shutting down debug daemon thread...\n");
atomic_set(&tctl->tctl_shutdown, 1);
wait_for_completion(&tctl->tctl_stop);
thread_running = 0;
git://git.whamcloud.com / fs / lustre-release.git / blobdiff