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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 <linux/moduleparam.h>
#include "glob.h"
#include "oplock.h"
#include "smb_common.h"
#ifdef CONFIG_SMB_INSECURE_SERVER
#include "smb1pdu.h"
#endif
#include "smbstatus.h"
#include "connection.h"
#include "mgmt/user_session.h"
#include "mgmt/share_config.h"
#include "mgmt/tree_connect.h"
static LIST_HEAD(lease_table_list);
static DEFINE_RWLOCK(lease_list_lock);
/**
* alloc_opinfo() - allocate a new opinfo object for oplock info
* @work: smb work
* @id: fid of open file
* @Tid: tree id of connection
*
* Return: allocated opinfo object on success, otherwise NULL
*/
static struct oplock_info *alloc_opinfo(struct ksmbd_work *work,
u64 id, __u16 Tid)
{
struct ksmbd_conn *conn = work->conn;
struct ksmbd_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 = conn;
opinfo->level = SMB2_OPLOCK_LEVEL_NONE;
opinfo->op_state = OPLOCK_STATE_NONE;
opinfo->pending_break = 0;
opinfo->fid = id;
opinfo->Tid = Tid;
#ifdef CONFIG_SMB_INSECURE_SERVER
opinfo->is_smb2 = IS_SMB2(conn);
#endif
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;
if (!lb)
return;
spin_lock(&lb->lb_lock);
if (list_empty(&opinfo->lease_entry)) {
spin_unlock(&lb->lb_lock);
return;
}
list_del_init(&opinfo->lease_entry);
opinfo->o_lease->l_lb = NULL;
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;
memcpy(lease->parent_lease_key, lctx->parent_lease_key, SMB2_LEASE_KEY_SIZE);
lease->version = lctx->version;
lease->epoch = 0;
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 ksmbd_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 ksmbd_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 ksmbd_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 ksmbd_inode *ci = opinfo->o_fp->f_ci;
if (opinfo->is_lease) {
write_lock(&lease_list_lock);
lease_del_list(opinfo);
write_unlock(&lease_list_lock);
}
write_lock(&ci->m_lock);
list_del_rcu(&opinfo->op_entry);
write_unlock(&ci->m_lock);
}
static unsigned long opinfo_count(struct ksmbd_file *fp)
{
if (ksmbd_stream_fd(fp))
return atomic_read(&fp->f_ci->sop_count);
else
return atomic_read(&fp->f_ci->op_count);
}
static void opinfo_count_inc(struct ksmbd_file *fp)
{
if (ksmbd_stream_fd(fp))
return atomic_inc(&fp->f_ci->sop_count);
else
return atomic_inc(&fp->f_ci->op_count);
}
static void opinfo_count_dec(struct ksmbd_file *fp)
{
if (ksmbd_stream_fd(fp))
return atomic_dec(&fp->f_ci->sop_count);
else
return atomic_dec(&fp->f_ci->op_count);
}
/**
* 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;
#ifdef CONFIG_SMB_INSECURE_SERVER
if (opinfo->is_smb2) {
if (!(opinfo->level == SMB2_OPLOCK_LEVEL_BATCH ||
opinfo->level == SMB2_OPLOCK_LEVEL_EXCLUSIVE)) {
pr_err("bad oplock(0x%x)\n", opinfo->level);
if (opinfo->is_lease)
pr_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)) {
pr_err("bad oplock(0x%x)\n", opinfo->level);
return -EINVAL;
}
opinfo->level = OPLOCK_READ;
}
#else
if (!(opinfo->level == SMB2_OPLOCK_LEVEL_BATCH ||
opinfo->level == SMB2_OPLOCK_LEVEL_EXCLUSIVE)) {
pr_err("bad oplock(0x%x)\n", opinfo->level);
if (opinfo->is_lease)
pr_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;
#endif
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;
#ifdef CONFIG_SMB_INSECURE_SERVER
if (opinfo->is_smb2) {
if (!(opinfo->level == SMB2_OPLOCK_LEVEL_BATCH ||
opinfo->level == SMB2_OPLOCK_LEVEL_EXCLUSIVE)) {
pr_err("bad oplock(0x%x)\n", opinfo->level);
if (opinfo->is_lease)
pr_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)) {
pr_err("bad oplock(0x%x)\n", opinfo->level);
return -EINVAL;
}
opinfo->level = OPLOCK_NONE;
}
#else
if (!(opinfo->level == SMB2_OPLOCK_LEVEL_BATCH ||
opinfo->level == SMB2_OPLOCK_LEVEL_EXCLUSIVE)) {
pr_err("bad oplock(0x%x)\n", opinfo->level);
if (opinfo->is_lease)
pr_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;
#endif
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;
#ifdef CONFIG_SMB_INSECURE_SERVER
if (opinfo->is_smb2) {
if (opinfo->level != SMB2_OPLOCK_LEVEL_II) {
pr_err("bad oplock(0x%x)\n", opinfo->level);
if (opinfo->is_lease)
pr_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) {
pr_err("bad oplock(0x%x)\n", opinfo->level);
return -EINVAL;
}
opinfo->level = OPLOCK_NONE;
}
#else
if (opinfo->level != SMB2_OPLOCK_LEVEL_II) {
pr_err("bad oplock(0x%x)\n", opinfo->level);
if (opinfo->is_lease)
pr_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;
#endif
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_LE)) {
ksmbd_debug(OPLOCK, "bad lease state(0x%x)\n", lease->state);
return -EINVAL;
}
lease->new_state = SMB2_LEASE_NONE_LE;
lease->state |= SMB2_LEASE_WRITE_CACHING_LE;
if (lease->state & SMB2_LEASE_HANDLE_CACHING_LE)
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_LE)) {
ksmbd_debug(OPLOCK, "bad lease state(0x%x)\n", lease->state);
return -EINVAL;
}
lease->new_state = SMB2_LEASE_NONE_LE;
lease->state = new_state;
if (lease->state & SMB2_LEASE_HANDLE_CACHING_LE)
if (lease->state & SMB2_LEASE_WRITE_CACHING_LE)
opinfo->level = SMB2_OPLOCK_LEVEL_BATCH;
else
opinfo->level = SMB2_OPLOCK_LEVEL_II;
else if (lease->state & SMB2_LEASE_WRITE_CACHING_LE)
opinfo->level = SMB2_OPLOCK_LEVEL_EXCLUSIVE;
else if (lease->state & SMB2_LEASE_READ_CACHING_LE)
opinfo->level = SMB2_OPLOCK_LEVEL_II;
return 0;
}
/**
* close_id_del_oplock() - release oplock object at file close time
* @fp: ksmbd file pointer
*/
void close_id_del_oplock(struct ksmbd_file *fp)
{
struct oplock_info *opinfo;
if (S_ISDIR(file_inode(fp->filp)->i_mode))
return;
opinfo = opinfo_get(fp);
if (!opinfo)
return;
opinfo_del(opinfo);
rcu_assign_pointer(fp->f_opinfo, NULL);
if (opinfo->op_state == OPLOCK_ACK_WAIT) {
opinfo->op_state = OPLOCK_CLOSING;
wake_up_interruptible_all(&opinfo->oplock_q);
if (opinfo->is_lease) {
atomic_set(&opinfo->breaking_cnt, 0);
wake_up_interruptible_all(&opinfo->oplock_brk);
}
}
opinfo_count_dec(fp);
atomic_dec(&opinfo->refcount);
opinfo_put(opinfo);
}
/**
* 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;
#ifdef CONFIG_SMB_INSECURE_SERVER
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;
}
#else
if (req_oplock == SMB2_OPLOCK_LEVEL_BATCH)
opinfo_new->level = SMB2_OPLOCK_LEVEL_BATCH;
else
opinfo_new->level = SMB2_OPLOCK_LEVEL_EXCLUSIVE;
#endif
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;
#ifdef CONFIG_SMB_INSECURE_SERVER
if (opinfo_new->is_smb2)
opinfo_new->level = SMB2_OPLOCK_LEVEL_II;
else
opinfo_new->level = OPLOCK_READ;
#else
opinfo_new->level = SMB2_OPLOCK_LEVEL_II;
#endif
if (lctx) {
lease->state = SMB2_LEASE_READ_CACHING_LE;
if (lctx->req_state & SMB2_LEASE_HANDLE_CACHING_LE)
lease->state |= SMB2_LEASE_HANDLE_CACHING_LE;
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;
#ifdef CONFIG_SMB_INSECURE_SERVER
if (opinfo_new->is_smb2)
opinfo_new->level = SMB2_OPLOCK_LEVEL_NONE;
else
opinfo_new->level = OPLOCK_NONE;
#else
opinfo_new->level = SMB2_OPLOCK_LEVEL_NONE;
#endif
if (lctx) {
lease->state = 0;
memcpy(lease->lease_key, lctx->lease_key, SMB2_LEASE_KEY_SIZE);
}
}
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 ksmbd_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) +
atomic_read(&ci->sop_count)) == 1) {
if (lease->state ==
(lctx->req_state & lease->state)) {
lease->state |= lctx->req_state;
if (lctx->req_state &
SMB2_LEASE_WRITE_CACHING_LE)
lease_read_to_write(opinfo);
}
} else if ((atomic_read(&ci->op_count) +
atomic_read(&ci->sop_count)) > 1) {
if (lctx->req_state ==
(SMB2_LEASE_READ_CACHING_LE |
SMB2_LEASE_HANDLE_CACHING_LE))
lease->state = lctx->req_state;
}
if (lctx->req_state && lease->state ==
SMB2_LEASE_NONE_LE)
lease_none_upgrade(opinfo, lctx->req_state);
}
read_lock(&ci->m_lock);
}
read_unlock(&ci->m_lock);
return m_opinfo;
}
static void wait_for_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_LE;
opinfo->level = SMB2_OPLOCK_LEVEL_NONE;
opinfo->op_state = OPLOCK_STATE_NONE;
}
}
static void wake_up_oplock_break(struct oplock_info *opinfo)
{
clear_bit_unlock(0, &opinfo->pending_break);
/* memory barrier is needed for wake_up_bit() */
smp_mb__after_atomic();
wake_up_bit(&opinfo->pending_break, 0);
}
static int oplock_break_pending(struct oplock_info *opinfo, int req_op_level)
{
while (test_and_set_bit(0, &opinfo->pending_break)) {
wait_on_bit(&opinfo->pending_break, 0, TASK_UNINTERRUPTIBLE);
/* Not immediately break to none. */
opinfo->open_trunc = 0;
if (opinfo->op_state == OPLOCK_CLOSING)
return -ENOENT;
else if (!opinfo->is_lease && opinfo->level <= req_op_level)
return 1;
}
if (!opinfo->is_lease && opinfo->level <= req_op_level) {
wake_up_oplock_break(opinfo);
return 1;
}
return 0;
}
static inline int allocate_oplock_break_buf(struct ksmbd_work *work)
{
work->response_buf = kzalloc(MAX_CIFS_SMALL_BUFFER_SIZE, GFP_KERNEL);
if (!work->response_buf)
return -ENOMEM;
work->response_sz = MAX_CIFS_SMALL_BUFFER_SIZE;
return 0;
}
#ifdef CONFIG_SMB_INSECURE_SERVER
/**
* smb1_oplock_break_noti() - send smb1 oplock break cmd from conn
* to client
* @work: smb work object
*
* There are two ways this function can be called. 1- while file open we break
* from exclusive/batch lock to levelII oplock and 2- while file write/truncate
* we break from levelII oplock no oplock.
* work->request_buf contains oplock_info.
*/
static void __smb1_oplock_break_noti(struct work_struct *wk)
{
struct ksmbd_work *work = container_of(wk, struct ksmbd_work, work);
struct ksmbd_conn *conn = work->conn;
struct smb_hdr *rsp_hdr;
struct smb_com_lock_req *req;
struct oplock_info *opinfo = work->request_buf;
if (allocate_oplock_break_buf(work)) {
pr_err("smb_allocate_rsp_buf failed! ");
ksmbd_free_work_struct(work);
return;
}
/* Init response header */
rsp_hdr = work->response_buf;
/* wct is 8 for locking andx(18) */
memset(rsp_hdr, 0, sizeof(struct smb_hdr) + 18);
rsp_hdr->smb_buf_length =
cpu_to_be32(conn->vals->header_size - 4 + 18);
rsp_hdr->Protocol[0] = 0xFF;
rsp_hdr->Protocol[1] = 'S';
rsp_hdr->Protocol[2] = 'M';
rsp_hdr->Protocol[3] = 'B';
rsp_hdr->Command = SMB_COM_LOCKING_ANDX;
/* we know unicode, long file name and use nt error codes */
rsp_hdr->Flags2 = SMBFLG2_UNICODE | SMBFLG2_KNOWS_LONG_NAMES |
SMBFLG2_ERR_STATUS;
rsp_hdr->Uid = cpu_to_le16(work->sess->id);
rsp_hdr->Pid = cpu_to_le16(0xFFFF);
rsp_hdr->Mid = cpu_to_le16(0xFFFF);
rsp_hdr->Tid = cpu_to_le16(opinfo->Tid);
rsp_hdr->WordCount = 8;
/* Init locking request */
req = work->response_buf;
req->AndXCommand = 0xFF;
req->AndXReserved = 0;
req->AndXOffset = 0;
req->Fid = opinfo->fid;
req->LockType = LOCKING_ANDX_OPLOCK_RELEASE;
if (!opinfo->open_trunc &&
(opinfo->level == OPLOCK_BATCH ||
opinfo->level == OPLOCK_EXCLUSIVE))
req->OplockLevel = 1;
else
req->OplockLevel = 0;
req->Timeout = 0;
req->NumberOfUnlocks = 0;
req->ByteCount = 0;
ksmbd_debug(OPLOCK, "sending oplock break for fid %d lock level = %d\n",
req->Fid, req->OplockLevel);
ksmbd_conn_write(work);
ksmbd_free_work_struct(work);
/*
* Checking waitqueue to dropping pending requests on
* disconnection. waitqueue_active is safe because it
* uses atomic operation for condition.
*/
if (!atomic_dec_return(&conn->r_count) && waitqueue_active(&conn->r_count_q))
wake_up(&conn->r_count_q);
}
/**
* smb1_oplock_break() - 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_noti(struct oplock_info *opinfo)
{
struct ksmbd_conn *conn = opinfo->conn;
struct ksmbd_work *work = ksmbd_alloc_work_struct();
if (!work)
return -ENOMEM;
work->request_buf = (char *)opinfo;
work->conn = conn;
atomic_inc(&conn->r_count);
if (opinfo->op_state == OPLOCK_ACK_WAIT) {
INIT_WORK(&work->work, __smb1_oplock_break_noti);
ksmbd_queue_work(work);
wait_for_break_ack(opinfo);
} else {
__smb1_oplock_break_noti(&work->work);
if (opinfo->level == OPLOCK_READ)
opinfo->level = OPLOCK_NONE;
}
return 0;
}
#endif
/**
* __smb2_oplock_break_noti() - send smb2 oplock break cmd from conn
* to client
* @wk: smb work object
*
* There are two ways this function can be called. 1- while file open we break
* from exclusive/batch lock to levelII oplock and 2- while file write/truncate
* we break from levelII oplock no oplock.
* work->request_buf contains oplock_info.
*/
static void __smb2_oplock_break_noti(struct work_struct *wk)
{
struct smb2_oplock_break *rsp = NULL;
struct ksmbd_work *work = container_of(wk, struct ksmbd_work, work);
struct ksmbd_conn *conn = work->conn;
struct oplock_break_info *br_info = work->request_buf;
struct smb2_hdr *rsp_hdr;
struct ksmbd_file *fp;
fp = ksmbd_lookup_durable_fd(br_info->fid);
if (!fp)
goto out;
if (allocate_oplock_break_buf(work)) {
pr_err("smb2_allocate_rsp_buf failed! ");
ksmbd_fd_put(work, fp);
goto out;
}
rsp_hdr = smb2_get_msg(work->response_buf);
memset(rsp_hdr, 0, sizeof(struct smb2_hdr) + 2);
*(__be32 *)work->response_buf =
cpu_to_be32(conn->vals->header_size);
rsp_hdr->ProtocolId = SMB2_PROTO_NUMBER;
rsp_hdr->StructureSize = SMB2_HEADER_STRUCTURE_SIZE;
rsp_hdr->CreditRequest = cpu_to_le16(0);
rsp_hdr->Command = SMB2_OPLOCK_BREAK;
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 = smb2_get_msg(work->response_buf);
rsp->StructureSize = cpu_to_le16(24);
if (!br_info->open_trunc &&
(br_info->level == SMB2_OPLOCK_LEVEL_BATCH ||
br_info->level == SMB2_OPLOCK_LEVEL_EXCLUSIVE))
rsp->OplockLevel = SMB2_OPLOCK_LEVEL_II;
else
rsp->OplockLevel = SMB2_OPLOCK_LEVEL_NONE;
rsp->Reserved = 0;
rsp->Reserved2 = 0;
rsp->PersistentFid = cpu_to_le64(fp->persistent_id);
rsp->VolatileFid = cpu_to_le64(fp->volatile_id);
inc_rfc1001_len(work->response_buf, 24);
ksmbd_debug(OPLOCK,
"sending oplock break v_id %llu p_id = %llu lock level = %d\n",
rsp->VolatileFid, rsp->PersistentFid, rsp->OplockLevel);
ksmbd_fd_put(work, fp);
ksmbd_conn_write(work);
out:
ksmbd_free_work_struct(work);
/*
* Checking waitqueue to dropping pending requests on
* disconnection. waitqueue_active is safe because it
* uses atomic operation for condition.
*/
if (!atomic_dec_return(&conn->r_count) && waitqueue_active(&conn->r_count_q))
wake_up(&conn->r_count_q);
}
/**
* smb2_oplock_break_noti() - send smb2 exclusive/batch to level2 oplock
* break command from server to client
* @opinfo: oplock info object
*
* Return: 0 on success, otherwise error
*/
static int smb2_oplock_break_noti(struct oplock_info *opinfo)
{
struct ksmbd_conn *conn = opinfo->conn;
struct oplock_break_info *br_info;
int ret = 0;
struct ksmbd_work *work = ksmbd_alloc_work_struct();
if (!work)
return -ENOMEM;
br_info = kmalloc(sizeof(struct oplock_break_info), GFP_KERNEL);
if (!br_info) {
ksmbd_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;
atomic_inc(&conn->r_count);
if (opinfo->op_state == OPLOCK_ACK_WAIT) {
INIT_WORK(&work->work, __smb2_oplock_break_noti);
ksmbd_queue_work(work);
wait_for_break_ack(opinfo);
} else {
__smb2_oplock_break_noti(&work->work);
if (opinfo->level == SMB2_OPLOCK_LEVEL_II)
opinfo->level = SMB2_OPLOCK_LEVEL_NONE;
}
return ret;
}
/**
* __smb2_lease_break_noti() - send lease break command from server
* to client
* @wk: smb work object
*/
static void __smb2_lease_break_noti(struct work_struct *wk)
{
struct smb2_lease_break *rsp = NULL;
struct ksmbd_work *work = container_of(wk, struct ksmbd_work, work);
struct lease_break_info *br_info = work->request_buf;
struct ksmbd_conn *conn = work->conn;
struct smb2_hdr *rsp_hdr;
if (allocate_oplock_break_buf(work)) {
ksmbd_debug(OPLOCK, "smb2_allocate_rsp_buf failed! ");
goto out;
}
rsp_hdr = smb2_get_msg(work->response_buf);
memset(rsp_hdr, 0, sizeof(struct smb2_hdr) + 2);
*(__be32 *)work->response_buf =
cpu_to_be32(conn->vals->header_size);
rsp_hdr->ProtocolId = SMB2_PROTO_NUMBER;
rsp_hdr->StructureSize = SMB2_HEADER_STRUCTURE_SIZE;
rsp_hdr->CreditRequest = cpu_to_le16(0);
rsp_hdr->Command = SMB2_OPLOCK_BREAK;
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 = smb2_get_msg(work->response_buf);
rsp->StructureSize = cpu_to_le16(44);
rsp->Epoch = br_info->epoch;
rsp->Flags = 0;
if (br_info->curr_state & (SMB2_LEASE_WRITE_CACHING_LE |
SMB2_LEASE_HANDLE_CACHING_LE))
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(work->response_buf, 44);
ksmbd_conn_write(work);
out:
ksmbd_free_work_struct(work);
/*
* Checking waitqueue to dropping pending requests on
* disconnection. waitqueue_active is safe because it
* uses atomic operation for condition.
*/
if (!atomic_dec_return(&conn->r_count) && waitqueue_active(&conn->r_count_q))
wake_up(&conn->r_count_q);
}
/**
* smb2_lease_break_noti() - break lease when a new client request
* write lease