Documentation/filesystems

/*
   BlueZ - Bluetooth protocol stack for Linux
   Copyright (C) 2000-2001 Qualcomm Incorporated

   Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License version 2 as
   published by the Free Software Foundation;

   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
   OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
   IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
   CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
   WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

   ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
   COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
   SOFTWARE IS DISCLAIMED.
*/

/* Bluetooth HCI core. */

#include <linux/jiffies.h>
#include <linux/module.h>
#include <linux/kmod.h>

#include <linux/types.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/poll.h>
#include <linux/fcntl.h>
#include <linux/init.h>
#include <linux/skbuff.h>
#include <linux/workqueue.h>
#include <linux/interrupt.h>
#include <linux/notifier.h>
#include <linux/rfkill.h>
#include <linux/timer.h>
#include <linux/crypto.h>
#include <net/sock.h>

#include <asm/system.h>
#include <linux/uaccess.h>
#include <asm/unaligned.h>

#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>

#define AUTO_OFF_TIMEOUT 2000

static void hci_cmd_task(unsigned long arg);
static void hci_rx_task(unsigned long arg);
static void hci_tx_task(unsigned long arg);

static DEFINE_RWLOCK(hci_task_lock);

/* HCI device list */
LIST_HEAD(hci_dev_list);
DEFINE_RWLOCK(hci_dev_list_lock);

/* HCI callback list */
LIST_HEAD(hci_cb_list);
DEFINE_RWLOCK(hci_cb_list_lock);

/* HCI protocols */
#define HCI_MAX_PROTO	2
struct hci_proto *hci_proto[HCI_MAX_PROTO];

/* HCI notifiers list */
static ATOMIC_NOTIFIER_HEAD(hci_notifier);

/* ---- HCI notifications ---- */

int hci_register_notifier(struct notifier_block *nb)
{
	return atomic_notifier_chain_register(&hci_notifier, nb);
}

int hci_unregister_notifier(struct notifier_block *nb)
{
	return atomic_notifier_chain_unregister(&hci_notifier, nb);
}

static void hci_notify(struct hci_dev *hdev, int event)
{
	atomic_notifier_call_chain(&hci_notifier, event, hdev);
}

/* ---- HCI requests ---- */

void hci_req_complete(struct hci_dev *hdev, __u16 cmd, int result)
{
	BT_DBG("%s command 0x%04x result 0x%2.2x", hdev->name, cmd, result);

	/* If this is the init phase check if the completed command matches
	 * the last init command, and if not just return.
	 */
	if (test_bit(HCI_INIT, &hdev->flags) && hdev->init_last_cmd != cmd)
		return;

	if (hdev->req_status == HCI_REQ_PEND) {
		hdev->req_result = result;
		hdev->req_status = HCI_REQ_DONE;
		wake_up_interruptible(&hdev->req_wait_q);
	}
}

static void hci_req_cancel(struct hci_dev *hdev, int err)
{
	BT_DBG("%s err 0x%2.2x", hdev->name, err);

	if (hdev->req_status == HCI_REQ_PEND) {
		hdev->req_result = err;
		hdev->req_status = HCI_REQ_CANCELED;
		wake_up_interruptible(&hdev->req_wait_q);
	}
}

/* Execute request and wait for completion. */
static int __hci_request(struct hci_dev *hdev, void (*req)(struct hci_dev *hdev, unsigned long opt),
					unsigned long opt, __u32 timeout)
{
	DECLARE_WAITQUEUE(wait, current);
	int err = 0;

	BT_DBG("%s start", hdev->name);

	hdev->req_status = HCI_REQ_PEND;

	add_wait_queue(&hdev->req_wait_q, &wait);
	set_current_state(TASK_INTERRUPTIBLE);

	req(hdev, opt);
	schedule_timeout(timeout);

	remove_wait_queue(&hdev->req_wait_q, &wait);

	if (signal_pending(current))
		return -EINTR;

	switch (hdev->req_status) {
	case HCI_REQ_DONE:
		err = -bt_to_errno(hdev->req_result);
		break;

	case HCI_REQ_CANCELED:
		err = -hdev->req_result;
		break;

	default:
		err = -ETIMEDOUT;
		break;
	}

	hdev->req_status = hdev->req_result = 0;

	BT_DBG("%s end: err %d", hdev->name, err);

	return err;
}

static inline int hci_request(struct hci_dev *hdev, void (*req)(struct hci_dev *hdev, unsigned long opt),
					unsigned long opt, __u32 timeout)
{
	int ret;

	if (!test_bit(HCI_UP, &hdev->flags))
		return -ENETDOWN;

	/* Serialize all requests */
	hci_req_lock(hdev);
	ret = __hci_request(hdev, req, opt, timeout);
	hci_req_unlock(hdev);

	return ret;
}

static void hci_reset_req(struct hci_dev *hdev, unsigned long opt)
{
	BT_DBG("%s %ld", hdev->name, opt);

	/* Reset device */
	set_bit(HCI_RESET, &hdev->flags);
	hci_send_cmd(hdev, HCI_OP_RESET, 0, NULL);
}

static void hci_init_req(struct hci_dev *hdev, unsigned long opt)
{
	struct hci_cp_delete_stored_link_key cp;
	struct sk_buff *skb;
	__le16 param;
	__u8 flt_type;

	BT_DBG("%s %ld", hdev->name, opt);

	/* Driver initialization */

	/* Special commands */
	while ((skb = skb_dequeue(&hdev->driver_init))) {
		bt_cb(skb)->pkt_type = HCI_COMMAND_PKT;
		skb->dev = (void *) hdev;

		skb_queue_tail(&hdev->cmd_q, skb);
		tasklet_schedule(&hdev->cmd_task);
	}
	skb_queue_purge(&hdev->driver_init);

	/* Mandatory initialization */

	/* Reset */
	if (!test_bit(HCI_QUIRK_NO_RESET, &hdev->quirks)) {
			set_bit(HCI_RESET, &hdev->flags);
			hci_send_cmd(hdev, HCI_OP_RESET, 0, NULL);
	}

	/* Read Local Supported Features */
	hci_send_cmd(hdev, HCI_OP_READ_LOCAL_FEATURES, 0, NULL);

	/* Read Local Version */
	hci_send_cmd(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL);

	/* Read Buffer Size (ACL mtu, max pkt, etc.) */
	hci_send_cmd(hdev, HCI_OP_READ_BUFFER_SIZE, 0, NULL);

#if 0
	/* Host buffer size */
	{
		struct hci_cp_host_buffer_size cp;
		cp.acl_mtu = cpu_to_le16(HCI_MAX_ACL_SIZE);
		cp.sco_mtu = HCI_MAX_SCO_SIZE;
		cp.acl_max_pkt = cpu_to_le16(0xffff);
		cp.sco_max_pkt = cpu_to_le16(0xffff);
		hci_send_cmd(hdev, HCI_OP_HOST_BUFFER_SIZE, sizeof(cp), &cp);
	}
#endif

	/* Read BD Address */
	hci_send_cmd(hdev, HCI_OP_READ_BD_ADDR, 0, NULL);

	/* Read Class of Device */
	hci_send_cmd(hdev, HCI_OP_READ_CLASS_OF_DEV, 0, NULL);

	/* Read Local Name */
	hci_send_cmd(hdev, HCI_OP_READ_LOCAL_NAME, 0, NULL);

	/* Read Voice Setting */
	hci_send_cmd(hdev, HCI_OP_READ_VOICE_SETTING, 0, NULL);

	/* Optional initialization */

	/* Clear Event Filters */
	flt_type = HCI_FLT_CLEAR_ALL;
	hci_send_cmd(hdev, HCI_OP_SET_EVENT_FLT, 1, &flt_type);

	/* Connection accept timeout ~20 secs */
	param = cpu_to_le16(0x7d00);
	hci_send_cmd(hdev, HCI_OP_WRITE_CA_TIMEOUT, 2, &param);

	bacpy(&cp.bdaddr, BDADDR_ANY);
	cp.delete_all = 1;
	hci_send_cmd(hdev, HCI_OP_DELETE_STORED_LINK_KEY, sizeof(cp), &cp);
}

static void hci_le_init_req(struct hci_dev *hdev, unsigned long opt)
{
	BT_DBG("%s", hdev->name);

	/* Read LE buffer size */
	hci_send_cmd(hdev, HCI_OP_LE_READ_BUFFER_SIZE, 0, NULL);
}

static void hci_scan_req(struct hci_dev *hdev, unsigned long opt)
{
	__u8 scan = opt;

	BT_DBG("%s %x", hdev->name, scan);

	/* Inquiry and Page scans */
	hci_send_cmd(hdev, HCI_OP_WRITE_SCAN_ENABLE, 1, &scan);
}

static void hci_auth_req(struct hci_dev *hdev, unsigned long opt)
{
	__u8 auth = opt;

	BT_DBG("%s %x", hdev->name, auth);

	/* Authentication */
	hci_send_cmd(hdev, HCI_OP_WRITE_AUTH_ENABLE, 1, &auth);
}

static void hci_encrypt_req(struct hci_dev *hdev, unsigned long opt)
{
	__u8 encrypt = opt;

	BT_DBG("%s %x", hdev->name, encrypt);

	/* Encryption */
	hci_send_cmd(hdev, HCI_OP_WRITE_ENCRYPT_MODE, 1, &encrypt);
}

static void hci_linkpol_req(struct hci_dev *hdev, unsigned long opt)
{
	__le16 policy = cpu_to_le16(opt);

	BT_DBG("%s %x", hdev->name, policy);

	/* Default link policy */
	hci_send_cmd(hdev, HCI_OP_WRITE_DEF_LINK_POLICY, 2, &policy);
}

/* Get HCI device by index.
 * Device is held on return. */
struct hci_dev *hci_dev_get(int index)
{
	struct hci_dev *hdev = NULL;
	struct list_head *p;

	BT_DBG("%d", index);

	if (index < 0)
		return NULL;

	read_lock(&hci_dev_list_lock);
	list_for_each(p, &hci_dev_list) {
		struct hci_dev *d = list_entry(p, struct hci_dev, list);
		if (d->id == index) {
			hdev = hci_dev_hold(d);
			break;
		}
	}
	read_unlock(&hci_dev_list_lock);
	return hdev;
}

/* ---- Inquiry support ---- */
static void inquiry_cache_flush(struct hci_dev *hdev)
{
	struct inquiry_cache *cache = &hdev->inq_cache;
	struct inquiry_entry *next  = cache->list, *e;

	BT_DBG("cache %p", cache);

	cache->list = NULL;
	while ((e = next)) {
		next = e->next;
		kfree(e);
	}
}

struct inquiry_entry *hci_inquiry_cache_lookup(struct hci_dev *hdev, bdaddr_t *bdaddr)
{
	struct inquiry_cache *cache = &hdev->inq_cache;
	struct inquiry_entry *e;

	BT_DBG("cache %p, %s", cache, batostr(bdaddr));

	for (e = cache->list; e; e = e->next)
		if (!bacmp(&e->data.bdaddr, bdaddr))
			break;
	return e;
}

void hci_inquiry_cache_update(struct hci_dev *hdev, struct inquiry_data *data)
{
	struct inquiry_cache *cache = &hdev->inq_cache;
	struct inquiry_entry *ie;

	BT_DBG("cache %p, %s", cache, batostr(&data->bdaddr));

	ie = hci_inquiry_cache_lookup(hdev, &data->bdaddr);
	if (!ie) {
		/* Entry not in the cache. Add new one. */
		ie = kzalloc(sizeof(struct inquiry_entry), GFP_ATOMIC);
		if (!ie)
			return;

		ie->next = cache->list;
		cache->list = ie;
	}

	memcpy(&ie->data, data, sizeof(*data));
	ie->timestamp = jiffies;
	cache->timestamp = jiffies;
}

static int inquiry_cache_dump(struct hci_dev *hdev, int num, __u8 *buf)
{
	struct inquiry_cache *cache = &hdev->inq_cache;
	struct inquiry_info *info = (struct inquiry_info *) buf;
	struct inquiry_entry *e;
	int copied = 0;

	for (e = cache->list; e && copied < num; e = e->next, copied++) {
		struct inquiry_data *data = &e->data;
		bacpy(&info->bdaddr, &data->bdaddr);
		info->pscan_rep_mode	= data->pscan_rep_mode;
		info->pscan_period_mode	= data->pscan_period_mode;
		info->pscan_mode	= data->pscan_mode;
		memcpy(info->dev_class, data->dev_class, 3);
		info->clock_offset	= data->clock_offset;
		info++;
	}

	BT_DBG("cache %p, copied %d", cache, copied);
	return copied;
}

static void hci_inq_req(struct hci_dev *hdev, unsigned long opt)
{
	struct hci_inquiry_req *ir = (struct hci_inquiry_req *) opt;
	struct hci_cp_inquiry cp;

	BT_DBG("%s", hdev->name);

	if (test_bit(HCI_INQUIRY, &hdev->flags))
		return;

	/* Start Inquiry */
	memcpy(&cp.lap, &ir->lap, 3);
	cp.length  = ir->length;
	cp.num_rsp = ir->num_rsp;
	hci_send_cmd(hdev, HCI_OP_INQUIRY, sizeof(cp), &cp);
}

int hci_inquiry(void __user *arg)
{
	__u8 __user *ptr = arg;
	struct hci_inquiry_req ir;
	struct hci_dev *hdev;
	int err = 0, do_inquiry = 0, max_rsp;
	long timeo;
	__u8 *buf;

	if (copy_from_user(&ir, ptr, sizeof(ir)))
		return -EFAULT;

	hdev = hci_dev_get(ir.dev_id);
	if (!hdev)
		return -ENODEV;

	hci_dev_lock_bh(hdev);
	if (inquiry_cache_age(hdev) > INQUIRY_CACHE_AGE_MAX ||
				inquiry_cache_empty(hdev) ||
				ir.flags & IREQ_CACHE_FLUSH) {
		inquiry_cache_flush(hdev);
		do_inquiry = 1;
	}
	hci_dev_unlock_bh(hdev);

	timeo = ir.length * msecs_to_jiffies(2000);

	if (do_inquiry) {
		err = hci_request(hdev, hci_inq_req, (unsigned long)&ir, timeo);
		if (err < 0)
			goto done;
	}

	/* for unlimited number of responses we will use buffer with 255 entries */
	max_rsp = (ir.num_rsp == 0) ? 255 : ir.num_rsp;

	/* cache_dump can't sleep. Therefore we allocate temp buffer and then
	 * copy it to the user space.
	 */
	buf = kmalloc(sizeof(struct inquiry_info) * max_rsp, GFP_KERNEL);
	if (!buf) {
		err = -ENOMEM;
		goto done;
	}

	hci_dev_lock_bh(hdev);
	ir.num_rsp = inquiry_cache_dump(hdev, max_rsp, buf);
	hci_dev_unlock_bh(hdev);

	BT_DBG("num_rsp %d", ir.num_rsp);

	if (!copy_to_user(ptr, &ir, sizeof(ir))) {
		ptr += sizeof(ir);
		if (copy_to_user(ptr, buf, sizeof(struct inquiry_info) *
					ir.num_rsp))
			err = -EFAULT;
	} else
		err = -EFAULT;

	kfree(buf);

done:
	hci_dev_put(hdev);
	return err;
}

/* ---- HCI ioctl helpers ---- */

int hci_dev_open(__u16 dev)
{
	struct hci_dev *hdev;
	int ret = 0;

	hdev = hci_dev_get(dev);
	if (!hdev)
		return -ENODEV;

	BT_DBG("%s %p", hdev->name, hdev);

	hci_req_lock(hdev);

	if (hdev->rfkill && rfkill_blocked(hdev->rfkill)) {
		ret = -ERFKILL;
		goto done;
	}

	if (test_bit(HCI_UP, &hdev->flags)) {
		ret = -EALREADY;
		goto done;
	}

	if (test_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks))
		set_bit(HCI_RAW, &hdev->flags);

	/* Treat all non BR/EDR controllers as raw devices for now */
	if (hdev->dev_type != HCI_BREDR)
		set_bit(HCI_RAW, &hdev->flags);

	if (hdev->open(hdev)) {
		ret = -EIO;
		goto done;
	}

	if (!test_bit(HCI_RAW, &hdev->flags)) {
		atomic_set(&hdev->cmd_cnt, 1);
		set_bit(HCI_INIT, &hdev->flags);
		hdev->init_last_cmd = 0;

		ret = __hci_request(hdev, hci_init_req, 0,
					msecs_to_jiffies(HCI_INIT_TIMEOUT));

		if (lmp_host_le_capable(hdev))
			ret = __hci_request(hdev, hci_le_init_req, 0,
					msecs_to_jiffies(HCI_INIT_TIMEOUT));

		clear_bit(HCI_INIT, &hdev->flags);
	}

	if (!ret) {
		hci_dev_hold(hdev);
		set_bit(HCI_UP, &hdev->flags);
		hci_notify(hdev, HCI_DEV_UP);
		if (!test_bit(HCI_SETUP, &hdev->flags))
			mgmt_powered(hdev->id, 1);
	} else {
		/* Init failed, cleanup */
		tasklet_kill(&hdev->rx_task);
		tasklet_kill(&hdev->tx_task);
		tasklet_kill(&hdev->cmd_task);

		skb_queue_purge(&hdev->cmd_q);
		skb_queue_purge(&hdev->rx_q);

		if (hdev->flush)
			hdev->flush(hdev);

		if (hdev->sent_cmd) {
			kfree_skb(hdev->sent_cmd);
			hdev->sent_cmd = NULL;
		}

		hdev->close(hdev);
		hdev->flags = 0;
	}

done:
	hci_req_unlock(hdev);
	hci_dev_put(hdev);
	return ret;
}

static int hci_dev_do_close(struct hci_dev *hdev)
{
	BT_DBG("%s %p", hdev->name, hdev);

	hci_req_cancel(hdev, ENODEV);
	hci_req_lock(hdev);

	if (!test_and_clear_bit(HCI_UP, &hdev->flags)) {
		del_timer_sync(&hdev->cmd_timer);
		hci_req_unlock(hdev);
		return 0;
	}

	/* Kill RX and TX tasks */
	tasklet_kill(&hdev->rx_task);
	tasklet_kill(&hdev->tx_task);

	hci_dev_lock_bh(hdev);
	inquiry_cache_flush(hdev);
	hci_conn_hash_flush(hdev);
	hci_dev_unlock_bh(hdev);

	hci_notify(hdev, HCI_DEV_DOWN);

	if (hdev->flush)
		hdev->flush(hdev);

	/* Reset device */
	skb_queue_purge(&hdev->cmd_q);
	atomic_set(&hdev->cmd_cnt, 1);
	if (!test_bit(HCI_RAW, &hdev->flags)) {
		set_bit(HCI_INIT, &hdev->flags);
		__hci_request(hdev, hci_reset_req, 0,
					msecs_to_jiffies(250));
		clear_bit(HCI_INIT, &hdev->flags);
	}

	/* Kill cmd task */
	tasklet_kill(&hdev->cmd_task);

	/* Drop queues */
	skb_queue_purge(&hdev->rx_q);
	skb_queue_purge(&hdev->cmd_q);
	skb_queue_purge(&hdev->raw_q);

	/* Drop last sent command */
	if (hdev->sent_cmd) {
		del_timer_sync(&hdev->cmd_timer);
		kfree_skb(hdev->sent_cmd);
		hdev->sent_cmd = NULL;
	}

	/* After this point our queues are empty
	 * and no tasks are scheduled. */
	hdev->close(hdev);

	mgmt_powered(hdev->id, 0);

	/* Clear flags */
	hdev->flags = 0;

	hci_req_unlock(hdev);

	hci_dev_put(hdev);
	return 0;
}

int hci_dev_close(__u16 dev)
{
	struct hci_dev *hdev;
	int err;

	hdev = hci_dev_get(dev);
	if (!hdev)
		return -ENODEV;
	err = hci_dev_do_close(hdev);
	hci_dev_put(hdev);
	return err;
}

int hci_dev_reset(__u16 dev)
{
	struct hci_dev *hdev;
	int ret = 0;

	hdev = hci_dev_get(dev);
	if (!hdev)
		return -ENODEV;

	hci_req_lock(hdev);
	tasklet_disable(&hdev->tx_task);

	if (!test_bit(HCI_UP, &hdev->flags))
		goto done;

	/* Drop queues */
	skb_queue_purge(&hdev->rx_q);
	skb_queue_purge(&hdev->cmd_q);

	hci_dev_lock_bh(hdev);
	inquiry_cache_flush(hdev);
	hci_conn_hash_flush(hdev);
	hci_dev_unlock_bh(hdev);

	if (hdev->flush)
		hdev->flush(hdev);

	atomic_set(&hdev->cmd_cnt, 1);
	hdev->acl_cnt = 0; hdev->sco_cnt = 0; hdev->le_cnt = 0;

	if (!test_bit(HCI_RAW, &hdev->flags))
		ret = __hci_request(hdev, hci_reset_req, 0,
					msecs_to_jiffies(HCI_INIT_TIMEOUT));

done:
	tasklet_enable(&hdev->tx_task);
	hci_req_unlock(hdev);
	hci_dev_put(hdev);
	return ret;
}

int hci_dev_reset_stat(__u16 dev)
{
	struct hci_dev *hdev;
	int ret = 0;

	hdev = hci_dev_get(dev);
	if (!hdev)
		return -ENODEV;

	memset(&hdev->stat, 0, sizeof(struct hci_dev_stats));

	hci_dev_put(hdev);

	return ret;
}

int hci_dev_cmd(unsigned int cmd, void __user *arg)
{
	struct hci_dev *hdev;
	struct hci_dev_req dr;
	int err = 0;

	if (copy_from_user(&dr, arg, sizeof(dr)))
		return -EFAULT;

	hdev = hci_dev_get(dr.dev_id);
	if (!hdev)
		return -ENODEV;

	switch (cmd) {
	case HCISETAUTH:
		err = hci_request(hdev, hci_auth_req, dr.dev_opt,
					msecs_to_jiffies(HCI_INIT_TIMEOUT));
		break;

	case HCISETENCRYPT:
		if (!lmp_encrypt_capable(hdev)) {
			err = -EOPNOTSUPP;
			break;
		}

		if (!test_bit(HCI_AUTH, &hdev->flags)) {
			/* Auth must be enabled first */
			err = hci_request(hdev, hci_auth_req, dr.dev_opt,
					msecs_to_jiffies(HCI_INIT_TIMEOUT));
			if (err)
				break;
		}

		err = hci_request(hdev, hci_encrypt_req, dr.dev_opt,
					msecs_to_jiffies(HCI_INIT_TIMEOUT));
		break;

	case HCISETSCAN:
		err = hci_request(hdev, hci_scan_req, dr.dev_opt,
					msecs_to_jiffies(HCI_INIT_TIMEOUT));
		break;

	case HCISETLINKPOL:
		err = hci_request(hdev, hci_linkpol_req, dr.dev_opt,
					msecs_to_jiffies(HCI_INIT_TIMEOUT));
		break;

	case HCISETLINKMODE:
		hdev->link_mode = ((__u16) dr.dev_opt) &
					(HCI_LM_MASTER | HCI_LM_ACCEPT);
Mode	Name	Size
-rw-r--r--	00-INDEX	3938	log stats plain blame
-rw-r--r--	9p.txt	6468	log stats plain blame
-rw-r--r--	Locking	22242	log stats plain blame
-rw-r--r--	Makefile	217	log stats plain blame
-rw-r--r--	adfs.txt	2706	log stats plain blame
-rw-r--r--	affs.txt	8217	log stats plain blame
-rw-r--r--	afs.txt	8025	log stats plain blame
-rw-r--r--	autofs4-mount-control.txt	17704	log stats plain blame
-rw-r--r--	automount-support.txt	4694	log stats plain blame
-rw-r--r--	befs.txt	3653	log stats plain blame
-rw-r--r--	bfs.txt	2118	log stats plain blame
-rw-r--r--	btrfs.txt	2918	log stats plain blame
d---------	caching	245	log stats plain
-rw-r--r--	ceph.txt	5375	log stats plain blame
-rw-r--r--	cifs.txt	2406	log stats plain blame
-rw-r--r--	coda.txt	49725	log stats plain blame
d---------	configfs	184	log stats plain
-rw-r--r--	cramfs.txt	2599	log stats plain blame
-rw-r--r--	debugfs.txt	7128	log stats plain blame
-rw-r--r--	devpts.txt	5085	log stats plain blame
-rw-r--r--	directory-locking	5153	log stats plain blame
-rw-r--r--	dlmfs.txt	4318	log stats plain blame
-rw-r--r--	dnotify.txt	2972	log stats plain blame
-rw-r--r--	dnotify_test.c	772	log stats plain blame
-rw-r--r--	ecryptfs.txt	2389	log stats plain blame
-rw-r--r--	exofs.txt	8753	log stats plain blame
-rw-r--r--	ext2.txt	18360	log stats plain blame
-rw-r--r--	ext3.txt	8620	log stats plain blame
-rw-r--r--	ext4.txt	26791	log stats plain blame
-rw-r--r--	fiemap.txt	9612	log stats plain blame
-rw-r--r--	files.txt	4241	log stats plain blame
-rw-r--r--	fuse.txt	16135	log stats plain blame
-rw-r--r--	gfs2-glocks.txt	5611	log stats plain blame
-rw-r--r--	gfs2-uevents.txt	3786	log stats plain blame
-rw-r--r--	gfs2.txt	1847	log stats plain blame
-rw-r--r--	hfs.txt	3000	log stats plain blame
-rw-r--r--	hfsplus.txt	1740	log stats plain blame
-rw-r--r--	hpfs.txt	15145	log stats plain blame
-rw-r--r--	inotify.txt	10960	log stats plain blame
-rw-r--r--	isofs.txt	2518	log stats plain blame
-rw-r--r--	jfs.txt	1796	log stats plain blame
-rw-r--r--	locks.txt	2715	log stats plain blame
-rw-r--r--	logfs.txt	9829	log stats plain blame
-rw-r--r--	mandatory-locking.txt	8164	log stats plain blame
-rw-r--r--	ncpfs.txt	574	log stats plain blame
d---------	nfs	391	log stats plain
-rw-r--r--	nilfs2.txt	8339	log stats plain blame
-rw-r--r--	ntfs.txt	32019	log stats plain blame
-rw-r--r--	ocfs2.txt	4140	log stats plain blame
-rw-r--r--	omfs.txt	4045	log stats plain blame
-rw-r--r--	path-lookup.txt	18874	log stats plain blame
d---------	pohmelfs	128	log stats plain
-rw-r--r--	porting	14552	log stats plain blame
-rw-r--r--	proc.txt	71216	log stats plain blame
-rw-r--r--	quota.txt	3179	log stats plain blame
-rw-r--r--	ramfs-rootfs-initramfs.txt	16132	log stats plain blame
-rw-r--r--	relay.txt	21618	log stats plain blame
-rw-r--r--	romfs.txt	8549	log stats plain blame
-rw-r--r--	seq_file.txt	12283	log stats plain blame
-rw-r--r--	sharedsubtree.txt	29710	log stats plain blame
-rw-r--r--	spufs.txt	20799	log stats plain blame
-rw-r--r--	squashfs.txt	10543	log stats plain blame
-rw-r--r--	sysfs-pci.txt	5282	log stats plain blame
-rw-r--r--	sysfs-tagging.txt	1894	log stats plain blame
-rw-r--r--	sysfs.txt	11484	log stats plain blame
-rw-r--r--	sysv-fs.txt	7614	log stats plain blame
-rw-r--r--	tmpfs.txt	6634	log stats plain blame
-rw-r--r--	ubifs.txt	5936	log stats plain blame
-rw-r--r--	udf.txt	3444	log stats plain blame
-rw-r--r--	ufs.txt	1243	log stats plain blame
-rw-r--r--	vfat.txt	13605	log stats plain blame
-rw-r--r--	vfs.txt	46883	log stats plain blame
-rw-r--r--	xfs-delayed-logging-design.txt	41513	log stats plain blame
-rw-r--r--	xfs.txt	10146	log stats plain blame
-rw-r--r--	xip.txt	3072	log stats plain blame