#include <linux/dcookies.h>
#include <linux/fs.h>
#include <asm/uaccess.h>
-
+
#include "oprof.h"
#include "event_buffer.h"
#include "oprofile_stats.h"
DEFINE_MUTEX(buffer_mutex);
-
+
static unsigned long buffer_opened;
static DECLARE_WAIT_QUEUE_HEAD(buffer_wait);
static unsigned long *event_buffer;
mutex_unlock(&buffer_mutex);
}
-
+
int alloc_event_buffer(void)
{
int err = -ENOMEM;
buffer_size = fs_buffer_size;
buffer_watershed = fs_buffer_watershed;
spin_unlock_irqrestore(&oprofilefs_lock, flags);
-
+
if (buffer_watershed >= buffer_size)
return -EINVAL;
-
+
event_buffer = vmalloc(sizeof(unsigned long) * buffer_size);
if (!event_buffer)
- goto out;
+ goto out;
err = 0;
out:
event_buffer = NULL;
}
-
+
static int event_buffer_open(struct inode *inode, struct file *file)
{
int err = -EPERM;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
- if (test_and_set_bit(0, &buffer_opened))
+ if (test_and_set_bit_lock(0, &buffer_opened))
return -EBUSY;
/* Register as a user of dcookies
file->private_data = dcookie_register();
if (!file->private_data)
goto out;
-
+
if ((err = oprofile_setup()))
goto fail;
/* NB: the actual start happens from userspace
* echo 1 >/dev/oprofile/enable
*/
-
+
return 0;
fail:
dcookie_unregister(file->private_data);
out:
- clear_bit(0, &buffer_opened);
+ __clear_bit_unlock(0, &buffer_opened);
return err;
}
dcookie_unregister(file->private_data);
buffer_pos = 0;
atomic_set(&buffer_ready, 0);
- clear_bit(0, &buffer_opened);
+ __clear_bit_unlock(0, &buffer_opened);
return 0;
}
retval = -EFAULT;
count = buffer_pos * sizeof(unsigned long);
-
+
if (copy_to_user(buf, event_buffer, count))
goto out;
retval = count;
buffer_pos = 0;
-
+
out:
mutex_unlock(&buffer_mutex);
return retval;
}
-
+
const struct file_operations event_buffer_fops = {
.open = event_buffer_open,
.release = event_buffer_release,