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oplock.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2016 Namjae Jeon <[email protected]>
* Copyright (C) 2018 Samsung Electronics Co., Ltd.
*/
#include "glob.h"
#include "oplock.h"
#include "smb_common.h"
#include "buffer_pool.h"
#include "transport_tcp.h"
#include "mgmt/user_session.h"
bool oplocks_enable;
bool lease_enable;
bool durable_enable;
LIST_HEAD(lease_table_list);
static DEFINE_RWLOCK(lease_list_lock);
module_param(oplocks_enable, bool, 0644);
MODULE_PARM_DESC(oplocks_enable, "Enable or disable oplocks. Default: y/Y/1");
module_param(lease_enable, bool, 0644);
MODULE_PARM_DESC(lease_enable, "Enable or disable lease. Default: y/Y/1");
/**
* get_new_opinfo() - allocate a new opinfo object for oplock info
* @conn: TCP server instance of connection
* @id: fid of open file
* @Tid: tree id of connection
* @lctx: lease context information
*
* Return: allocated opinfo object on success, otherwise NULL
*/
static struct oplock_info *alloc_opinfo(struct cifsd_work *work,
uint64_t id, __u16 Tid)
{
struct cifsd_session *sess = work->sess;
struct oplock_info *opinfo;
opinfo = kzalloc(sizeof(struct oplock_info), GFP_KERNEL);
if (!opinfo)
return NULL;
opinfo->sess = sess;
opinfo->conn = sess->conn;
opinfo->level = OPLOCK_NONE;
opinfo->op_state = OPLOCK_STATE_NONE;
opinfo->fid = id;
opinfo->Tid = Tid;
opinfo->is_smb2 = IS_SMB2(sess->conn);
INIT_LIST_HEAD(&opinfo->op_entry);
INIT_LIST_HEAD(&opinfo->interim_list);
init_waitqueue_head(&opinfo->oplock_q);
init_waitqueue_head(&opinfo->oplock_brk);
atomic_set(&opinfo->refcount, 1);
atomic_set(&opinfo->breaking_cnt, 0);
return opinfo;
}
static void lease_add_list(struct oplock_info *opinfo)
{
struct lease_table *lb = opinfo->o_lease->l_lb;
spin_lock(&lb->lb_lock);
list_add_rcu(&opinfo->lease_entry, &lb->lease_list);
spin_unlock(&lb->lb_lock);
}
static void lease_del_list(struct oplock_info *opinfo)
{
struct lease_table *lb = opinfo->o_lease->l_lb;
spin_lock(&lb->lb_lock);
list_del_rcu(&opinfo->lease_entry);
spin_unlock(&lb->lb_lock);
}
static void lb_add(struct lease_table *lb)
{
write_lock(&lease_list_lock);
list_add(&lb->l_entry, &lease_table_list);
write_unlock(&lease_list_lock);
}
static int alloc_lease(struct oplock_info *opinfo,
struct lease_ctx_info *lctx)
{
struct lease *lease;
lease = kmalloc(sizeof(struct lease), GFP_KERNEL);
if (!lease)
return -ENOMEM;
memcpy(lease->lease_key, lctx->lease_key, SMB2_LEASE_KEY_SIZE);
lease->state = lctx->req_state;
lease->new_state = 0;
lease->flags = lctx->flags;
lease->duration = lctx->duration;
INIT_LIST_HEAD(&opinfo->lease_entry);
opinfo->o_lease = lease;
return 0;
}
static void free_lease(struct oplock_info *opinfo)
{
struct lease *lease;
lease = opinfo->o_lease;
kfree(lease);
}
static void free_opinfo(struct oplock_info *opinfo)
{
if (opinfo->is_lease)
free_lease(opinfo);
kfree(opinfo);
}
static inline void opinfo_free_rcu(struct rcu_head *rcu_head)
{
struct oplock_info *opinfo;
opinfo = container_of(rcu_head, struct oplock_info, rcu_head);
free_opinfo(opinfo);
}
struct oplock_info *opinfo_get(struct cifsd_file *fp)
{
struct oplock_info *opinfo;
rcu_read_lock();
opinfo = rcu_dereference(fp->f_opinfo);
if (opinfo && !atomic_inc_not_zero(&opinfo->refcount))
opinfo = NULL;
rcu_read_unlock();
return opinfo;
}
static struct oplock_info *opinfo_get_list(struct cifsd_inode *ci)
{
struct oplock_info *opinfo;
if (list_empty(&ci->m_op_list))
return NULL;
rcu_read_lock();
opinfo = list_first_or_null_rcu(&ci->m_op_list, struct oplock_info,
op_entry);
if (opinfo && !atomic_inc_not_zero(&opinfo->refcount))
opinfo = NULL;
rcu_read_unlock();
return opinfo;
}
void opinfo_put(struct oplock_info *opinfo)
{
if (!atomic_dec_and_test(&opinfo->refcount))
return;
call_rcu(&opinfo->rcu_head, opinfo_free_rcu);
}
static void opinfo_add(struct oplock_info *opinfo)
{
struct cifsd_inode *ci = opinfo->o_fp->f_ci;
write_lock(&ci->m_lock);
list_add_rcu(&opinfo->op_entry, &ci->m_op_list);
write_unlock(&ci->m_lock);
}
static void opinfo_del(struct oplock_info *opinfo)
{
struct cifsd_inode *ci = opinfo->o_fp->f_ci;
if (opinfo->is_lease)
lease_del_list(opinfo);
write_lock(&ci->m_lock);
list_del_rcu(&opinfo->op_entry);
write_unlock(&ci->m_lock);
}
/**
* opinfo_write_to_read() - convert a write oplock to read oplock
* @opinfo: current oplock info
*
* Return: 0 on success, otherwise -EINVAL
*/
int opinfo_write_to_read(struct oplock_info *opinfo)
{
struct lease *lease = opinfo->o_lease;
if (opinfo->is_smb2) {
if (!((opinfo->level == SMB2_OPLOCK_LEVEL_BATCH) ||
(opinfo->level == SMB2_OPLOCK_LEVEL_EXCLUSIVE))) {
cifsd_err("bad oplock(0x%x)\n", opinfo->level);
if (opinfo->is_lease)
cifsd_err("lease state(0x%x)\n", lease->state);
return -EINVAL;
}
opinfo->level = SMB2_OPLOCK_LEVEL_II;
if (opinfo->is_lease)
lease->state = lease->new_state;
} else {
if (!((opinfo->level == OPLOCK_EXCLUSIVE) ||
(opinfo->level == OPLOCK_BATCH))) {
cifsd_err("bad oplock(0x%x)\n", opinfo->level);
return -EINVAL;
}
opinfo->level = OPLOCK_READ;
}
return 0;
}
/**
* opinfo_read_handle_to_read() - convert a read/handle oplock to read oplock
* @opinfo: current oplock info
*
* Return: 0 on success, otherwise -EINVAL
*/
int opinfo_read_handle_to_read(struct oplock_info *opinfo)
{
struct lease *lease = opinfo->o_lease;
lease->state = lease->new_state;
opinfo->level = SMB2_OPLOCK_LEVEL_II;
return 0;
}
/**
* opinfo_write_to_none() - convert a write oplock to none
* @opinfo: current oplock info
*
* Return: 0 on success, otherwise -EINVAL
*/
int opinfo_write_to_none(struct oplock_info *opinfo)
{
struct lease *lease = opinfo->o_lease;
if (opinfo->is_smb2) {
if (!((opinfo->level == SMB2_OPLOCK_LEVEL_BATCH) ||
(opinfo->level == SMB2_OPLOCK_LEVEL_EXCLUSIVE))) {
cifsd_err("bad oplock(0x%x)\n", opinfo->level);
if (opinfo->is_lease)
cifsd_err("lease state(0x%x)\n",
lease->state);
return -EINVAL;
}
opinfo->level = SMB2_OPLOCK_LEVEL_NONE;
if (opinfo->is_lease)
lease->state = lease->new_state;
} else {
if (!((opinfo->level == OPLOCK_EXCLUSIVE) ||
(opinfo->level == OPLOCK_BATCH))) {
cifsd_err("bad oplock(0x%x)\n", opinfo->level);
return -EINVAL;
}
opinfo->level = OPLOCK_NONE;
}
return 0;
}
/**
* opinfo_read_to_none() - convert a write read to none
* @opinfo: current oplock info
*
* Return: 0 on success, otherwise -EINVAL
*/
int opinfo_read_to_none(struct oplock_info *opinfo)
{
struct lease *lease = opinfo->o_lease;
if (opinfo->is_smb2) {
if (opinfo->level != SMB2_OPLOCK_LEVEL_II) {
cifsd_err("bad oplock(0x%x)\n", opinfo->level);
if (opinfo->is_lease)
cifsd_err("lease state(0x%x)\n", lease->state);
return -EINVAL;
}
opinfo->level = SMB2_OPLOCK_LEVEL_NONE;
if (opinfo->is_lease)
lease->state = lease->new_state;
} else {
if (opinfo->level != OPLOCK_READ) {
cifsd_err("bad oplock(0x%x)\n", opinfo->level);
return -EINVAL;
}
opinfo->level = OPLOCK_NONE;
}
return 0;
}
/**
* lease_read_to_write() - upgrade lease state from read to write
* @opinfo: current lease info
*
* Return: 0 on success, otherwise -EINVAL
*/
int lease_read_to_write(struct oplock_info *opinfo)
{
struct lease *lease = opinfo->o_lease;
if (!(lease->state & SMB2_LEASE_READ_CACHING)) {
cifsd_debug("bad lease state(0x%x)\n",
lease->state);
return -EINVAL;
}
lease->new_state = SMB2_LEASE_NONE;
lease->state |= SMB2_LEASE_WRITE_CACHING;
if (lease->state & SMB2_LEASE_HANDLE_CACHING)
opinfo->level = SMB2_OPLOCK_LEVEL_BATCH;
else
opinfo->level = SMB2_OPLOCK_LEVEL_EXCLUSIVE;
return 0;
}
/**
* lease_none_upgrade() - upgrade lease state from none
* @opinfo: current lease info
* @new_state: new lease state
*
* Return: 0 on success, otherwise -EINVAL
*/
static int lease_none_upgrade(struct oplock_info *opinfo,
__le32 new_state)
{
struct lease *lease = opinfo->o_lease;
if (!(lease->state == SMB2_LEASE_NONE)) {
cifsd_debug("bad lease state(0x%x)\n",
lease->state);
return -EINVAL;
}
lease->new_state = SMB2_LEASE_NONE;
lease->state = new_state;
if (lease->state & SMB2_LEASE_HANDLE_CACHING)
if (lease->state & SMB2_LEASE_WRITE_CACHING)
opinfo->level = SMB2_OPLOCK_LEVEL_BATCH;
else
opinfo->level = SMB2_OPLOCK_LEVEL_II;
else if (lease->state & SMB2_LEASE_WRITE_CACHING)
opinfo->level = SMB2_OPLOCK_LEVEL_EXCLUSIVE;
else if (lease->state & SMB2_LEASE_READ_CACHING)
opinfo->level = SMB2_OPLOCK_LEVEL_II;
return 0;
}
/**
* close_id_del_oplock() - release oplock object at file close time
* @conn: TCP server instance of connection
* @fp: cifsd file pointer
* @id: fid of open file
*/
void close_id_del_oplock(struct cifsd_file *fp)
{
struct oplock_info *opinfo;
if (!oplocks_enable || S_ISDIR(file_inode(fp->filp)->i_mode))
return;
opinfo = fp->f_opinfo;
if (!opinfo)
return;
opinfo_del(opinfo);
fp->f_opinfo = NULL;
if (opinfo->op_state == OPLOCK_ACK_WAIT) {
opinfo->op_state = OPLOCK_CLOSING;
wake_up_interruptible(&opinfo->oplock_q);
if (opinfo->is_lease) {
atomic_set(&opinfo->breaking_cnt, 0);
wake_up_interruptible(&opinfo->oplock_brk);
}
}
atomic_dec(&fp->f_ci->op_count);
opinfo_put(opinfo);
}
/**
* smb2_send_lease_break_notification() - send lease break command from server
* to client
* @work: smb work object
*/
static void smb2_send_lease_break_notification(struct work_struct *wk)
{
struct smb2_lease_break *rsp = NULL;
struct cifsd_work *work = container_of(wk, struct cifsd_work, work);
struct lease_break_info *br_info =
(struct lease_break_info *)REQUEST_BUF(work);
struct cifsd_tcp_conn *conn = work->conn;
struct smb2_hdr *rsp_hdr;
cifsd_tcp_conn_lock(conn);
if (conn->ops->allocate_rsp_buf(work)) {
cifsd_debug("smb2_allocate_rsp_buf failed! ");
cifsd_tcp_conn_unlock(conn);
cifsd_free_work_struct(work);
return;
}
rsp_hdr = (struct smb2_hdr *)RESPONSE_BUF(work);
memset(rsp_hdr, 0, sizeof(struct smb2_hdr) + 2);
rsp_hdr->smb2_buf_length = cpu_to_be32(HEADER_SIZE_NO_BUF_LEN(conn));
rsp_hdr->ProtocolId = SMB2_PROTO_NUMBER;
rsp_hdr->StructureSize = SMB2_HEADER_STRUCTURE_SIZE;
rsp_hdr->CreditRequest = cpu_to_le16(0);
rsp_hdr->Command = cpu_to_le16(0x12);
rsp_hdr->Flags = (SMB2_FLAGS_SERVER_TO_REDIR);
rsp_hdr->NextCommand = 0;
rsp_hdr->MessageId = cpu_to_le64(-1);
rsp_hdr->Id.SyncId.ProcessId = 0;
rsp_hdr->Id.SyncId.TreeId = 0;
rsp_hdr->SessionId = 0;
memset(rsp_hdr->Signature, 0, 16);
rsp = (struct smb2_lease_break *)RESPONSE_BUF(work);
rsp->StructureSize = cpu_to_le16(44);
rsp->Reserved = 0;
rsp->Flags = 0;
if (br_info->curr_state & (SMB2_LEASE_WRITE_CACHING |
SMB2_LEASE_HANDLE_CACHING))
rsp->Flags = SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED;
memcpy(rsp->LeaseKey, br_info->lease_key, SMB2_LEASE_KEY_SIZE);
rsp->CurrentLeaseState = br_info->curr_state;
rsp->NewLeaseState = br_info->new_state;
rsp->BreakReason = 0;
rsp->AccessMaskHint = 0;
rsp->ShareMaskHint = 0;
inc_rfc1001_len(rsp, 44);
cifsd_tcp_write(work);
cifsd_tcp_conn_unlock(conn);
cifsd_free_work_struct(work);
}
/**
* smb1_oplock_break_notification() - send smb1 exclusive/batch to level2 oplock
* break command from server to client
* @opinfo: oplock info object
* @ack_required if requiring ack
*
* Return: 0 on success, otherwise error
*/
static int smb1_oplock_break_notification(struct oplock_info *opinfo,
int ack_required)
{
struct cifsd_tcp_conn *conn = opinfo->conn;
int ret = 0;
struct cifsd_work *work = cifsd_alloc_work_struct();
if (!work)
return -ENOMEM;
work->request_buf = (char *)opinfo;
work->conn = conn;
if (ack_required) {
int rc;
INIT_WORK(&work->work, smb1_send_oplock_break_notification);
schedule_work(&work->work);
/*
* TODO: change to wait_event_interruptible_timeout once oplock
* break notification timeout is decided. In case of oplock
* break from levelII to none, we don't need to wait for client
* response.
*/
rc = wait_event_interruptible_timeout(opinfo->oplock_q,
opinfo->op_state == OPLOCK_STATE_NONE ||
opinfo->op_state == OPLOCK_CLOSING,
OPLOCK_WAIT_TIME);
/* is this a timeout ? */
if (!rc) {
opinfo->level = OPLOCK_NONE;
opinfo->op_state = OPLOCK_STATE_NONE;
}
} else {
smb1_send_oplock_break_notification(&work->work);
if (opinfo->level == OPLOCK_READ)
opinfo->level = OPLOCK_NONE;
}
return ret;
}
/**
* smb2_oplock_break_notification() - send smb2 exclusive/batch to level2 oplock
* break command from server to client
* @opinfo: oplock info object
* @ack_required if requiring ack
*
* Return: 0 on success, otherwise error
*/
static int smb2_oplock_break_notification(struct oplock_info *opinfo,
int ack_required)
{
struct cifsd_tcp_conn *conn = opinfo->conn;
struct oplock_break_info *br_info;
int ret = 0;
struct cifsd_work *work = cifsd_alloc_work_struct();
if (!work)
return -ENOMEM;
br_info = kmalloc(sizeof(struct oplock_break_info), GFP_KERNEL);
if (!br_info) {
cifsd_free_work_struct(work);
return -ENOMEM;
}
br_info->level = opinfo->level;
br_info->fid = opinfo->fid;
br_info->open_trunc = opinfo->open_trunc;
work->request_buf = (char *)br_info;
work->conn = conn;
work->sess = opinfo->sess;
if (ack_required) {
int rc;
INIT_WORK(&work->work, smb2_send_oplock_break_notification);
schedule_work(&work->work);
rc = wait_event_interruptible_timeout(opinfo->oplock_q,
opinfo->op_state == OPLOCK_STATE_NONE ||
opinfo->op_state == OPLOCK_CLOSING,
OPLOCK_WAIT_TIME);
/* is this a timeout ? */
if (!rc) {
opinfo->level = SMB2_OPLOCK_LEVEL_NONE;
opinfo->op_state = OPLOCK_STATE_NONE;
}
} else {
smb2_send_oplock_break_notification(&work->work);
if (opinfo->level == SMB2_OPLOCK_LEVEL_II)
opinfo->level = SMB2_OPLOCK_LEVEL_NONE;
}
return ret;
}
/**
* grant_write_oplock() - grant exclusive/batch oplock or write lease
* @opinfo_new: new oplock info object
* @req_oplock: request oplock
* @lctx: lease context information
*
* Return: 0
*/
static void grant_write_oplock(struct oplock_info *opinfo_new, int req_oplock,
struct lease_ctx_info *lctx)
{
struct lease *lease = opinfo_new->o_lease;
if (opinfo_new->is_smb2) {
if (req_oplock == SMB2_OPLOCK_LEVEL_BATCH)
opinfo_new->level = SMB2_OPLOCK_LEVEL_BATCH;
else
opinfo_new->level = SMB2_OPLOCK_LEVEL_EXCLUSIVE;
} else {
if (req_oplock == REQ_BATCHOPLOCK)
opinfo_new->level = OPLOCK_BATCH;
else
opinfo_new->level = OPLOCK_EXCLUSIVE;
}
if (lctx) {
lease->state = lctx->req_state;
memcpy(lease->lease_key, lctx->lease_key,
SMB2_LEASE_KEY_SIZE);
}
}
/**
* grant_read_oplock() - grant level2 oplock or read lease
* @opinfo_new: new oplock info object
* @lctx: lease context information
*
* Return: 0
*/
static void grant_read_oplock(struct oplock_info *opinfo_new,
struct lease_ctx_info *lctx)
{
struct lease *lease = opinfo_new->o_lease;
if (opinfo_new->is_smb2)
opinfo_new->level = SMB2_OPLOCK_LEVEL_II;
else
opinfo_new->level = OPLOCK_READ;
if (lctx) {
lease->state = SMB2_LEASE_READ_CACHING;
if (lctx->req_state & SMB2_LEASE_HANDLE_CACHING)
lease->state |= SMB2_LEASE_HANDLE_CACHING;
memcpy(lease->lease_key, lctx->lease_key,
SMB2_LEASE_KEY_SIZE);
}
}
/**
* grant_none_oplock() - grant none oplock or none lease
* @opinfo_new: new oplock info object
* @lctx: lease context information
*
* Return: 0
*/
static void grant_none_oplock(struct oplock_info *opinfo_new,
struct lease_ctx_info *lctx)
{
struct lease *lease = opinfo_new->o_lease;
if (opinfo_new->is_smb2)
opinfo_new->level = SMB2_OPLOCK_LEVEL_NONE;
else
opinfo_new->level = OPLOCK_NONE;
if (lctx) {
lease->state = 0;
memcpy(lease->lease_key, lctx->lease_key,
SMB2_LEASE_KEY_SIZE);
}
}
/**
* find_opinfo() - find lease object for given client guid and lease key
* @head: oplock list(read,write or none) head
* @guid1: client guid of matching lease owner
* @key1: lease key of matching lease owner
*
* Return: oplock(lease) object on success, otherwise NULL
*/
static inline int compare_guid_key(struct oplock_info *opinfo,
const char *guid1, const char *key1)
{
const char *guid2, *key2;
guid2 = opinfo->conn->ClientGUID;
key2 = opinfo->o_lease->lease_key;
if (!memcmp(guid1, guid2, SMB2_CLIENT_GUID_SIZE) &&
!memcmp(key1, key2, SMB2_LEASE_KEY_SIZE))
return 1;
return 0;
}
/**
* same_client_has_lease() - check whether current lease request is
* from lease owner of file
* @ci: master file pointer
* @client_guid: Client GUID
* @lctx: lease context information
*
* Return: oplock(lease) object on success, otherwise NULL
*/
static struct oplock_info *same_client_has_lease(struct cifsd_inode *ci,
char *client_guid, struct lease_ctx_info *lctx)
{
int ret;
struct lease *lease;
struct oplock_info *opinfo;
struct oplock_info *m_opinfo = NULL;
if (!lctx)
return NULL;
/*
* Compare lease key and client_guid to know request from same owner
* of same client
*/
read_lock(&ci->m_lock);
list_for_each_entry(opinfo, &ci->m_op_list, op_entry) {
if (!opinfo->is_lease)
continue;
read_unlock(&ci->m_lock);
lease = opinfo->o_lease;
ret = compare_guid_key(opinfo, client_guid, lctx->lease_key);
if (ret) {
m_opinfo = opinfo;
/* skip upgrading lease about breaking lease */
if (atomic_read(&opinfo->breaking_cnt)) {
read_lock(&ci->m_lock);
continue;
}
/* upgrading lease */
if (atomic_read(&ci->op_count) == 1) {
if (lease->state ==
(lctx->req_state & lease->state)) {
lease->state |= lctx->req_state;
if (lctx->req_state &
SMB2_LEASE_WRITE_CACHING)
lease_read_to_write(opinfo);
}
} else if (atomic_read(&ci->op_count) > 1) {
if (lctx->req_state == 0x3)
lease->state = lctx->req_state;
}
if (lctx->req_state && lease->state == SMB2_LEASE_NONE)
lease_none_upgrade(opinfo, lctx->req_state);
}
read_lock(&ci->m_lock);
}
read_unlock(&ci->m_lock);
return m_opinfo;
}
static void wait_for_lease_break_ack(struct oplock_info *opinfo)
{
int rc = 0;
rc = wait_event_interruptible_timeout(opinfo->oplock_q,
opinfo->op_state == OPLOCK_STATE_NONE ||
opinfo->op_state == OPLOCK_CLOSING,
OPLOCK_WAIT_TIME);
/* is this a timeout ? */
if (!rc) {
if (opinfo->is_lease)
opinfo->o_lease->state = SMB2_LEASE_NONE;
opinfo->level = SMB2_OPLOCK_LEVEL_NONE;
opinfo->op_state = OPLOCK_STATE_NONE;
}
}
/**
* smb2_break_lease_notification() - break lease when a new client request
* write lease
* @opinfo: conains lease state information
* @ack_required: if requring ack
*
* Return: 0 on success, otherwise error
*/
static int smb2_break_lease_notification(struct oplock_info *opinfo, int ack_required)
{
struct cifsd_tcp_conn *conn = opinfo->conn;
struct list_head *tmp, *t;
struct cifsd_work *work;
struct lease_break_info *br_info;
struct lease *lease = opinfo->o_lease;
work = cifsd_alloc_work_struct();
if (!work)
return -ENOMEM;
br_info = kmalloc(sizeof(struct lease_break_info), GFP_KERNEL);
if (!br_info) {
cifsd_free_work_struct(work);
return -ENOMEM;
}
br_info->curr_state = lease->state;
br_info->new_state = lease->new_state;
memcpy(br_info->lease_key, lease->lease_key, SMB2_LEASE_KEY_SIZE);
work->request_buf = (char *)br_info;
work->conn = conn;
work->sess = opinfo->sess;
if (ack_required) {
list_for_each_safe(tmp, t, &opinfo->interim_list) {
struct cifsd_work *in_work;
in_work = list_entry(tmp, struct cifsd_work,
interim_entry);
smb2_send_interim_resp(in_work, STATUS_PENDING);
list_del(&in_work->interim_entry);
}
INIT_WORK(&work->work, smb2_send_lease_break_notification);
schedule_work(&work->work);
wait_for_lease_break_ack(opinfo);
if (!atomic_read(&opinfo->breaking_cnt))
wake_up_interruptible(&opinfo->oplock_brk);
if (atomic_read(&opinfo->breaking_cnt)) {
int ret = 0;
ret = wait_event_interruptible_timeout(opinfo->oplock_brk,
atomic_read(&opinfo->breaking_cnt) == 0,
OPLOCK_WAIT_TIME);
if (!ret)
atomic_set(&opinfo->breaking_cnt, 0);
}
} else {
smb2_send_lease_break_notification(&work->work);
if (opinfo->o_lease->state == SMB2_LEASE_READ_CACHING) {
opinfo->level = SMB2_OPLOCK_LEVEL_NONE;
opinfo->o_lease->state = SMB2_LEASE_NONE;
}
}
return 0;
}
static int smb_send_oplock_break_notification(struct oplock_info *brk_opinfo)
{
int err = 0;
int ack_required = 0;
/* Need to break exclusive/batch oplock, write lease or overwrite_if */
cifsd_debug("request to send oplock(level : 0x%x) break notification\n",
brk_opinfo->level);
if (brk_opinfo->is_lease) {
struct lease *lease = brk_opinfo->o_lease;
if (!(lease->state == SMB2_LEASE_READ_CACHING))
atomic_inc(&brk_opinfo->breaking_cnt);
if (brk_opinfo->op_state == OPLOCK_ACK_WAIT) {
/* wait till getting break ack */
wait_for_lease_break_ack(brk_opinfo);
/* Not immediately break to none. */
brk_opinfo->open_trunc = 0;
}
if (brk_opinfo->open_trunc) {
/*
* Create overwrite break trigger the lease break to
* none.
*/
lease->new_state = SMB2_LEASE_NONE;
} else {
if (lease->state & SMB2_LEASE_WRITE_CACHING) {
if (lease->state & SMB2_LEASE_HANDLE_CACHING)
lease->new_state =
SMB2_LEASE_READ_CACHING |
SMB2_LEASE_HANDLE_CACHING;
else
lease->new_state =
SMB2_LEASE_READ_CACHING;
} else {
if (lease->state & SMB2_LEASE_HANDLE_CACHING)
lease->new_state =
SMB2_LEASE_READ_CACHING;
else
lease->new_state = SMB2_LEASE_NONE;
}
}
if (lease->state & (SMB2_LEASE_WRITE_CACHING |
SMB2_LEASE_HANDLE_CACHING))
brk_opinfo->op_state = OPLOCK_ACK_WAIT;
} else if (brk_opinfo->level == SMB2_OPLOCK_LEVEL_BATCH ||
brk_opinfo->level == SMB2_OPLOCK_LEVEL_EXCLUSIVE)
brk_opinfo->op_state = OPLOCK_ACK_WAIT;
if (brk_opinfo->is_smb2) {
if (brk_opinfo->is_lease) {
struct lease *lease = brk_opinfo->o_lease;
if ((brk_opinfo->open_trunc == 1 &&
!(lease->state & SMB2_LEASE_WRITE_CACHING)) ||
lease->state == SMB2_LEASE_READ_CACHING)
ack_required = 0;
else
ack_required = 1;
err = smb2_break_lease_notification(brk_opinfo,
ack_required);
} else {
/* break oplock */
if (brk_opinfo->level == SMB2_OPLOCK_LEVEL_BATCH ||
brk_opinfo->level ==
SMB2_OPLOCK_LEVEL_EXCLUSIVE)
ack_required = 1;
err = smb2_oplock_break_notification(brk_opinfo,
ack_required);
}
} else {
if ((brk_opinfo->level == SMB2_OPLOCK_LEVEL_BATCH) ||
(brk_opinfo->level == SMB2_OPLOCK_LEVEL_EXCLUSIVE))
ack_required = 1;
err = smb1_oplock_break_notification(brk_opinfo,
ack_required);
}
cifsd_debug("oplock granted = %d\n", brk_opinfo->level);
if (brk_opinfo->op_state == OPLOCK_CLOSING) {
brk_opinfo->op_state = OPLOCK_STATE_NONE;
err = -ENOENT;
}
return err;
}
void destroy_lease_table(struct cifsd_tcp_conn *conn)
{
struct lease_table *lb, *lbtmp;
struct oplock_info *opinfo;
write_lock(&lease_list_lock);
if (list_empty(&lease_table_list)) {
write_unlock(&lease_list_lock);
return;
}
list_for_each_entry_safe(lb, lbtmp, &lease_table_list, l_entry) {
if (conn && memcmp(lb->client_guid, conn->ClientGUID,
SMB2_CLIENT_GUID_SIZE))
continue;
again:
rcu_read_lock();
list_for_each_entry_rcu(opinfo, &lb->lease_list,
lease_entry) {
rcu_read_unlock();
lease_del_list(opinfo);
goto again;
}
rcu_read_unlock();
list_del(&lb->l_entry);
kfree(lb);
}
write_unlock(&lease_list_lock);
}
int find_same_lease_key(struct cifsd_session *sess, struct cifsd_inode *ci,
struct lease_ctx_info *lctx)
{
struct oplock_info *opinfo;
int err = 0;
struct lease_table *lb;
if (!lctx)
return err;
read_lock(&lease_list_lock);
if (list_empty(&lease_table_list)) {
read_unlock(&lease_list_lock);
return 0;
}
list_for_each_entry(lb, &lease_table_list, l_entry) {
if (!memcmp(lb->client_guid, sess->conn->ClientGUID,
SMB2_CLIENT_GUID_SIZE))
goto found;
}
read_unlock(&lease_list_lock);
return 0;
found:
rcu_read_lock();
list_for_each_entry_rcu(opinfo, &lb->lease_list,
lease_entry) {
if (!atomic_inc_not_zero(&opinfo->refcount))
continue;
rcu_read_unlock();
if (opinfo->o_fp->f_ci == ci)
goto op_next;
err = compare_guid_key(opinfo,
sess->conn->ClientGUID,
lctx->lease_key);
if (err) {
err = -EINVAL;
cifsd_debug("found same lease key is already used in other files\n");
opinfo_put(opinfo);
goto out;
}
op_next:
opinfo_put(opinfo);
rcu_read_lock();
}
rcu_read_unlock();
out:
read_unlock(&lease_list_lock);
return err;
}
static void copy_lease(struct oplock_info *op1, struct oplock_info *op2)
{
struct lease *lease1 = op1->o_lease;
struct lease *lease2 = op2->o_lease;
op2->level = op1->level;
lease2->state = lease1->state;