[PATCH v4 07/10] cifsd: add oplock/lease cache mechanism

Namjae Jeon
2021-06-02T03:59:03Z

This adds oplock and lease cache mechanism.

Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Signed-off-by: Hyunchul Lee <hyc.lee@gmail.com>
Acked-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
---
fs/cifsd/oplock.c | 1661 +++++++++++++++++++++++++++++++++++++++++++++
fs/cifsd/oplock.h | 132 ++++
2 files changed, 1793 insertions(+)
create mode 100644 fs/cifsd/oplock.c
create mode 100644 fs/cifsd/oplock.h

diff --git a/fs/cifsd/oplock.c b/fs/cifsd/oplock.c
new file mode 100644
index 000000000000..f76de7861e7b
--- /dev/null
+++ b/fs/cifsd/oplock.c
@@ -0,0 +1,1661 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2016 Namjae Jeon <linkinjeon@kernel.org>
+ * Copyright (C) 2018 Samsung Electronics Co., Ltd.
+ */
+
+#include <linux/moduleparam.h>
+
+#include "glob.h"
+#include "oplock.h"
+
+#include "smb_common.h"
+#include "smbstatus.h"
+#include "buffer_pool.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_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->pending_break = 0;
+ opinfo->fid = id;
+ opinfo->Tid = Tid;
+ 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;
+ 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;
+
+ if (!(opinfo->level == SMB2_OPLOCK_LEVEL_BATCH ||
+ opinfo->level == SMB2_OPLOCK_LEVEL_EXCLUSIVE)) {
+ ksmbd_err("bad oplock(0x%x)\n", opinfo->level);
+ if (opinfo->is_lease)
+ ksmbd_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;
+ 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->level == SMB2_OPLOCK_LEVEL_BATCH ||
+ opinfo->level == SMB2_OPLOCK_LEVEL_EXCLUSIVE)) {
+ ksmbd_err("bad oplock(0x%x)\n", opinfo->level);
+ if (opinfo->is_lease)
+ ksmbd_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;
+ 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->level != SMB2_OPLOCK_LEVEL_II) {
+ ksmbd_err("bad oplock(0x%x)\n", opinfo->level);
+ if (opinfo->is_lease)
+ ksmbd_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;
+ 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;
+
+ if (req_oplock == SMB2_OPLOCK_LEVEL_BATCH)
+ opinfo_new->level = SMB2_OPLOCK_LEVEL_BATCH;
+ else
+ opinfo_new->level = SMB2_OPLOCK_LEVEL_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;
+
+ opinfo_new->level = SMB2_OPLOCK_LEVEL_II;
+
+ 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;
+
+ opinfo_new->level = SMB2_OPLOCK_LEVEL_NONE;
+
+ 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;
+}
+
+/**
+ * __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) {
+ atomic_dec(&conn->r_count);
+ ksmbd_free_work_struct(work);
+ return;
+ }
+
+ if (allocate_oplock_break_buf(work)) {
+ ksmbd_err("smb2_allocate_rsp_buf failed! ");
+ atomic_dec(&conn->r_count);
+ ksmbd_fd_put(work, fp);
+ ksmbd_free_work_struct(work);
+ return;
+ }
+
+ rsp_hdr = work->response_buf;
+ 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 = 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 = 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(rsp, 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);
+ ksmbd_free_work_struct(work);
+ atomic_dec(&conn->r_count);
+}
+
+/**
+ * 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! ");
+ ksmbd_free_work_struct(work);
+ atomic_dec(&conn->r_count);
+ return;
+ }
+
+ rsp_hdr = work->response_buf;
+ 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 = 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 = work->response_buf;
+ rsp->StructureSize = cpu_to_le16(44);
+ rsp->Reserved = 0;
+ 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(rsp, 44);
+
+ ksmbd_conn_write(work);
+ ksmbd_free_work_struct(work);
+ atomic_dec(&conn->r_count);
+}
+
+/**
+ * smb2_lease_break_noti() - break lease when a new client request
+ * write lease
+ * @opinfo: conains lease state information
+ *
+ * Return: 0 on success, otherwise error
+ */
+static int smb2_lease_break_noti(struct oplock_info *opinfo)
+{
+ struct ksmbd_conn *conn = opinfo->conn;
+ struct list_head *tmp, *t;
+ struct ksmbd_work *work;
+ struct lease_break_info *br_info;
+ struct lease *lease = opinfo->o_lease;
+
+ work = ksmbd_alloc_work_struct();
+ if (!work)
+ return -ENOMEM;
+
+ br_info = kmalloc(sizeof(struct lease_break_info), GFP_KERNEL);
+ if (!br_info) {
+ ksmbd_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;
+
+ atomic_inc(&conn->r_count);
+ if (opinfo->op_state == OPLOCK_ACK_WAIT) {
+ list_for_each_safe(tmp, t, &opinfo->interim_list) {
+ struct ksmbd_work *in_work;
+
+ in_work = list_entry(tmp, struct ksmbd_work,
+ interim_entry);
+ setup_async_work(in_work, NULL, NULL);
+ smb2_send_interim_resp(in_work, STATUS_PENDING);
+ list_del(&in_work->interim_entry);
+ }
+ INIT_WORK(&work->work, __smb2_lease_break_noti);
+ ksmbd_queue_work(work);
+ wait_for_break_ack(opinfo);
+ } else {
+ __smb2_lease_break_noti(&work->work);
+ if (opinfo->o_lease->new_state == SMB2_LEASE_NONE_LE) {
+ opinfo->level = SMB2_OPLOCK_LEVEL_NONE;
+ opinfo->o_lease->state = SMB2_LEASE_NONE_LE;
+ }
+ }
+ return 0;
+}
+
+static void wait_lease_breaking(struct oplock_info *opinfo)
+{
+ if (!opinfo->is_lease)
+ return;
+
+ wake_up_interruptible_all(&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,
+ HZ);
+ if (!ret)
+ atomic_set(&opinfo->breaking_cnt, 0);
+ }
+}
+
+static int oplock_break(struct oplock_info *brk_opinfo, int req_op_level)
+{
+ int err = 0;
+
+ /* Need to break exclusive/batch oplock, write lease or overwrite_if */
+ ksmbd_debug(OPLOCK,
+ "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;
+
+ atomic_inc(&brk_opinfo->breaking_cnt);
+
+ err = oplock_break_pending(brk_opinfo, req_op_level);
+ if (err)
+ return err < 0 ? err : 0;
+
+ if (brk_opinfo->open_trunc) {
+ /*
+ * Create overwrite break trigger the lease break to
+ * none.
+ */
+ lease->new_state = SMB2_LEASE_NONE_LE;
+ } else {
+ if (lease->state & SMB2_LEASE_WRITE_CACHING_LE) {
+ if (lease->state & SMB2_LEASE_HANDLE_CACHING_LE)
+ lease->new_state =
+ SMB2_LEASE_READ_CACHING_LE |
+ SMB2_LEASE_HANDLE_CACHING_LE;
+ else
+ lease->new_state =
+ SMB2_LEASE_READ_CACHING_LE;
+ } else {
+ if (lease->state & SMB2_LEASE_HANDLE_CACHING_LE)
+ lease->new_state =
+ SMB2_LEASE_READ_CACHING_LE;
+ else
+ lease->new_state = SMB2_LEASE_NONE_LE;
+ }
+ }
+
+ if (lease->state & (SMB2_LEASE_WRITE_CACHING_LE |
+ SMB2_LEASE_HANDLE_CACHING_LE))
+ brk_opinfo->op_state = OPLOCK_ACK_WAIT;
+ else
+ atomic_dec(&brk_opinfo->breaking_cnt);
+ } else {
+ err = oplock_break_pending(brk_opinfo, req_op_level);
+ if (err)
+ return err < 0 ? err : 0;
+
+ 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_lease)
+ err = smb2_lease_break_noti(brk_opinfo);
+ else
+ err = smb2_oplock_break_noti(brk_opinfo);
+
+ ksmbd_debug(OPLOCK, "oplock granted = %d\n", brk_opinfo->level);
+ if (brk_opinfo->op_state == OPLOCK_CLOSING)
+ err = -ENOENT;
+ wake_up_oplock_break(brk_opinfo);
+
+ wait_lease_breaking(brk_opinfo);
+
+ return err;
+}
+
+void destroy_lease_table(struct ksmbd_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 ksmbd_session *sess, struct ksmbd_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;
+ ksmbd_debug(OPLOCK,
+ "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;
+ memcpy(lease2->lease_key, lease1->lease_key,
+ SMB2_LEASE_KEY_SIZE);
+ lease2->duration = lease1->duration;
+ lease2->flags = lease1->flags;
+}
+
+static int add_lease_global_list(struct oplock_info *opinfo)
+{
+ struct lease_table *lb;
+
+ read_lock(&lease_list_lock);
+ list_for_each_entry(lb, &lease_table_list, l_entry) {
+ if (!memcmp(lb->client_guid, opinfo->conn->ClientGUID,
+ SMB2_CLIENT_GUID_SIZE)) {
+ opinfo->o_lease->l_lb = lb;
+ lease_add_list(opinfo);
+ read_unlock(&lease_list_lock);
+ return 0;
+ }
+ }
+ read_unlock(&lease_list_lock);
+
+ lb = kmalloc(sizeof(struct lease_table), GFP_KERNEL);
+ if (!lb)
+ return -ENOMEM;
+
+ memcpy(lb->client_guid, opinfo->conn->ClientGUID,
+ SMB2_CLIENT_GUID_SIZE);
+ INIT_LIST_HEAD(&lb->lease_list);
+ spin_lock_init(&lb->lb_lock);
+ opinfo->o_lease->l_lb = lb;
+ lease_add_list(opinfo);
+ lb_add(lb);
+ return 0;
+}
+
+static void set_oplock_level(struct oplock_info *opinfo, int level,
+ struct lease_ctx_info *lctx)
+{
+ switch (level) {
+ case SMB2_OPLOCK_LEVEL_BATCH:
+ case SMB2_OPLOCK_LEVEL_EXCLUSIVE:
+ grant_write_oplock(opinfo, level, lctx);
+ break;
+ case SMB2_OPLOCK_LEVEL_II:
+ grant_read_oplock(opinfo, lctx);
+ break;
+ default:
+ grant_none_oplock(opinfo, lctx);
+ break;
+ }
+}
+
+/**
+ * smb_grant_oplock() - handle oplock/lease request on file open
+ * @work: smb work
+ * @req_op_level: oplock level
+ * @pid: id of open file
+ * @fp: ksmbd file pointer
+ * @tid: Tree id of connection
+ * @lctx: lease context information on file open
+ * @share_ret: share mode
+ *
+ * Return: 0 on success, otherwise error
+ */
+int smb_grant_oplock(struct ksmbd_work *work, int req_op_level, u64 pid,
+ struct ksmbd_file *fp, __u16 tid,
+ struct lease_ctx_info *lctx, int share_ret)
+{
+ struct ksmbd_session *sess = work->sess;
+ int err = 0;
+ struct oplock_info *opinfo = NULL, *prev_opinfo = NULL;
+ struct ksmbd_inode *ci = fp->f_ci;
+ bool prev_op_has_lease;
+ __le32 prev_op_state = 0;
+
+ /* not support directory lease */
+ if (S_ISDIR(file_inode(fp->filp)->i_mode)) {
+ if (lctx)
+ lctx->dlease = 1;
+ return 0;
+ }
+
+ opinfo = alloc_opinfo(work, pid, tid);
+ if (!opinfo)
+ return -ENOMEM;
+
+ if (lctx) {
+ err = alloc_lease(opinfo, lctx);
+ if (err)
+ goto err_out;
+ opinfo->is_lease = 1;
+ }
+
+ /* ci does not have any oplock */
+ if (!opinfo_count(fp))
+ goto set_lev;
+
+ /* grant none-oplock if second open is trunc */
+ if (ATTR_FP(fp)) {
+ req_op_level = SMB2_OPLOCK_LEVEL_NONE;
+ goto set_lev;
+ }
+
+ if (lctx) {
+ struct oplock_info *m_opinfo;
+
+ /* is lease already granted ? */
+ m_opinfo = same_client_has_lease(ci, sess->conn->ClientGUID,
+ lctx);
+ if (m_opinfo) {
+ copy_lease(m_opinfo, opinfo);
+ if (atomic_read(&m_opinfo->breaking_cnt))
+ opinfo->o_lease->flags =
+ SMB2_LEASE_FLAG_BREAK_IN_PROGRESS_LE;
+ goto out;
+ }
+ }
+ prev_opinfo = opinfo_get_list(ci);
+ if (!prev_opinfo ||
+ (prev_opinfo->level == SMB2_OPLOCK_LEVEL_NONE && lctx))
+ goto set_lev;
+ prev_op_has_lease = prev_opinfo->is_lease;
+ if (prev_op_has_lease)
+ prev_op_state = prev_opinfo->o_lease->state;
+
+ if (share_ret < 0 &&
+ prev_opinfo->level == SMB2_OPLOCK_LEVEL_EXCLUSIVE) {
+ err = share_ret;
+ opinfo_put(prev_opinfo);
+ goto err_out;
+ }
+
+ if (prev_opinfo->level != SMB2_OPLOCK_LEVEL_BATCH &&
+ prev_opinfo->level != SMB2_OPLOCK_LEVEL_EXCLUSIVE) {
+ opinfo_put(prev_opinfo);
+ goto op_break_not_needed;
+ }
+
+ list_add(&work->interim_entry, &prev_opinfo->interim_list);
+ err = oplock_break(prev_opinfo, SMB2_OPLOCK_LEVEL_II);
+ opinfo_put(prev_opinfo);
+ if (err == -ENOENT)
+ goto set_lev;
+ /* Check all oplock was freed by close */
+ else if (err < 0)
+ goto err_out;
+
+op_break_not_needed:
+ if (share_ret < 0) {
+ err = share_ret;
+ goto err_out;
+ }
+
+ if (req_op_level != SMB2_OPLOCK_LEVEL_NONE)
+ req_op_level = SMB2_OPLOCK_LEVEL_II;
+
+ /* grant fixed oplock on stacked locking between lease and oplock */
+ if (prev_op_has_lease && !lctx)
+ if (prev_op_state & SMB2_LEASE_HANDLE_CACHING_LE)
+ req_op_level = SMB2_OPLOCK_LEVEL_NONE;
+
+ if (!prev_op_has_lease && lctx) {
+ req_op_level = SMB2_OPLOCK_LEVEL_II;
+ lctx->req_state = SMB2_LEASE_READ_CACHING_LE;
+ }
+
+set_lev:
+ set_oplock_level(opinfo, req_op_level, lctx);
+
+out:
+ rcu_assign_pointer(fp->f_opinfo, opinfo);
+ opinfo->o_fp = fp;
+
+ opinfo_count_inc(fp);
+ opinfo_add(opinfo);
+ if (opinfo->is_lease) {
+ err = add_lease_global_list(opinfo);
+ if (err)
+ goto err_out;
+ }
+
+ return 0;
+err_out:
+ free_opinfo(opinfo);
+ return err;
+}
+
+/**
+ * smb_break_all_write_oplock() - break batch/exclusive oplock to level2
+ * @work: smb work
+ * @fp: ksmbd file pointer
+ * @is_trunc: truncate on open
+ */
+static void smb_break_all_write_oplock(struct ksmbd_work *work,
+ struct ksmbd_file *fp, int is_trunc)
+{
+ struct oplock_info *brk_opinfo;
+
+ brk_opinfo = opinfo_get_list(fp->f_ci);
+ if (!brk_opinfo)
+ return;
+ if (brk_opinfo->level != SMB2_OPLOCK_LEVEL_BATCH &&
+ brk_opinfo->level != SMB2_OPLOCK_LEVEL_EXCLUSIVE) {
+ opinfo_put(brk_opinfo);
+ return;
+ }
+
+ brk_opinfo->open_trunc = is_trunc;
+ list_add(&work->interim_entry, &brk_opinfo->interim_list);
+ oplock_break(brk_opinfo, SMB2_OPLOCK_LEVEL_II);
+ opinfo_put(brk_opinfo);
+}
+
+/**
+ * smb_break_all_levII_oplock() - send level2 oplock or read lease break command
+ * from server to client
+ * @work: smb work
+ * @fp: ksmbd file pointer
+ * @is_trunc: truncate on open
+ */
+void smb_break_all_levII_oplock(struct ksmbd_work *work, struct ksmbd_file *fp,
+ int is_trunc)
+{
+ struct oplock_info *op, *brk_op;
+ struct ksmbd_inode *ci;
+ struct ksmbd_conn *conn = work->sess->conn;
+
+ if (!test_share_config_flag(work->tcon->share_conf,
+ KSMBD_SHARE_FLAG_OPLOCKS))
+ return;
+
+ ci = fp->f_ci;
+ op = opinfo_get(fp);
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(brk_op, &ci->m_op_list, op_entry) {
+ if (!atomic_inc_not_zero(&brk_op->refcount))
+ continue;
+ rcu_read_unlock();
+ if (brk_op->is_lease && (brk_op->o_lease->state &
+ (~(SMB2_LEASE_READ_CACHING_LE |
+ SMB2_LEASE_HANDLE_CACHING_LE)))) {
+ ksmbd_debug(OPLOCK, "unexpected lease state(0x%x)\n",
+ brk_op->o_lease->state);
+ goto next;
+ } else if (brk_op->level !=
+ SMB2_OPLOCK_LEVEL_II) {
+ ksmbd_debug(OPLOCK, "unexpected oplock(0x%x)\n",
+ brk_op->level);
+ goto next;
+ }
+
+ /* Skip oplock being break to none */
+ if (brk_op->is_lease &&
+ brk_op->o_lease->new_state == SMB2_LEASE_NONE_LE &&
+ atomic_read(&brk_op->breaking_cnt))
+ goto next;
+
+ if (op && op->is_lease && brk_op->is_lease &&
+ !memcmp(conn->ClientGUID, brk_op->conn->ClientGUID,
+ SMB2_CLIENT_GUID_SIZE) &&
+ !memcmp(op->o_lease->lease_key, brk_op->o_lease->lease_key,
+ SMB2_LEASE_KEY_SIZE))
+ goto next;
+ brk_op->open_trunc = is_trunc;
+ oplock_break(brk_op, SMB2_OPLOCK_LEVEL_NONE);
+next:
+ opinfo_put(brk_op);
+ rcu_read_lock();
+ }
+ rcu_read_unlock();
+
+ if (op)
+ opinfo_put(op);
+}
+
+/**
+ * smb_break_all_oplock() - break both batch/exclusive and level2 oplock
+ * @work: smb work
+ * @fp: ksmbd file pointer
+ */
+void smb_break_all_oplock(struct ksmbd_work *work, struct ksmbd_file *fp)
+{
+ if (!test_share_config_flag(work->tcon->share_conf,
+ KSMBD_SHARE_FLAG_OPLOCKS))
+ return;
+
+ smb_break_all_write_oplock(work, fp, 1);
+ smb_break_all_levII_oplock(work, fp, 1);
+}
+
+/**
+ * smb2_map_lease_to_oplock() - map lease state to corresponding oplock type
+ * @lease_state: lease type
+ *
+ * Return: 0 if no mapping, otherwise corresponding oplock type
+ */
+__u8 smb2_map_lease_to_oplock(__le32 lease_state)
+{
+ if (lease_state == (SMB2_LEASE_HANDLE_CACHING_LE |
+ SMB2_LEASE_READ_CACHING_LE |
+ SMB2_LEASE_WRITE_CACHING_LE)) {
+ return SMB2_OPLOCK_LEVEL_BATCH;
+ } else if (lease_state != SMB2_LEASE_WRITE_CACHING_LE &&
+ lease_state & SMB2_LEASE_WRITE_CACHING_LE) {
+ if (!(lease_state & SMB2_LEASE_HANDLE_CACHING_LE))
+ return SMB2_OPLOCK_LEVEL_EXCLUSIVE;
+ } else if (lease_state & SMB2_LEASE_READ_CACHING_LE) {
+ return SMB2_OPLOCK_LEVEL_II;
+ }
+ return 0;
+}
+
+/**
+ * create_lease_buf() - create lease context for open cmd response
+ * @rbuf: buffer to create lease context response
+ * @lease: buffer to stored parsed lease state information
+ */
+void create_lease_buf(u8 *rbuf, struct lease *lease)
+{
+ struct create_lease *buf = (struct create_lease *)rbuf;
+ char *LeaseKey = (char *)&lease->lease_key;
+
+ memset(buf, 0, sizeof(struct create_lease));
+ buf->lcontext.LeaseKeyLow = *((__le64 *)LeaseKey);
+ buf->lcontext.LeaseKeyHigh = *((__le64 *)(LeaseKey + 8));
+ buf->lcontext.LeaseFlags = lease->flags;
+ buf->lcontext.LeaseState = lease->state;
+ buf->ccontext.DataOffset = cpu_to_le16(offsetof
+ (struct create_lease, lcontext));
+ buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context));
+ buf->ccontext.NameOffset = cpu_to_le16(offsetof
+ (struct create_lease, Name));
+ buf->ccontext.NameLength = cpu_to_le16(4);
+ buf->Name[0] = 'R';
+ buf->Name[1] = 'q';
+ buf->Name[2] = 'L';
+ buf->Name[3] = 's';
+}
+
+/**
+ * parse_lease_state() - parse lease context containted in file open request
+ * @open_req: buffer containing smb2 file open(create) request
+ *
+ * Return: oplock state, -ENOENT if create lease context not found
+ */
+struct lease_ctx_info *parse_lease_state(void *open_req)
+{
+ char *data_offset;
+ struct create_context *cc;
+ unsigned int next = 0;
+ char *name;
+ bool found = false;
+ struct smb2_create_req *req = (struct smb2_create_req *)open_req;
+ struct lease_ctx_info *lreq = kzalloc(sizeof(struct lease_ctx_info),
+ GFP_KERNEL);
+ if (!lreq)
+ return NULL;
+
+ data_offset = (char *)req + 4 + le32_to_cpu(req->CreateContextsOffset);
+ cc = (struct create_context *)data_offset;
+ do {
+ cc = (struct create_context *)((char *)cc + next);
+ name = le16_to_cpu(cc->NameOffset) + (char *)cc;
+ if (le16_to_cpu(cc->NameLength) != 4 ||
+ strncmp(name, SMB2_CREATE_REQUEST_LEASE, 4)) {
+ next = le32_to_cpu(cc->Next);
+ continue;
+ }
+ found = true;
+ break;
+ } while (next != 0);
+
+ if (found) {
+ struct create_lease *lc = (struct create_lease *)cc;
+ *((__le64 *)lreq->lease_key) = lc->lcontext.LeaseKeyLow;
+ *((__le64 *)(lreq->lease_key + 8)) = lc->lcontext.LeaseKeyHigh;
+ lreq->req_state = lc->lcontext.LeaseState;
+ lreq->flags = lc->lcontext.LeaseFlags;
+ lreq->duration = lc->lcontext.LeaseDuration;
+ return lreq;
+ }
+
+ kfree(lreq);
+ return NULL;
+}
+
+/**
+ * smb2_find_context_vals() - find a particular context info in open request
+ * @open_req: buffer containing smb2 file open(create) request
+ * @tag: context name to search for
+ *
+ * Return: pointer to requested context, NULL if @str context not found
+ */
+struct create_context *smb2_find_context_vals(void *open_req, const char *tag)
+{
+ char *data_offset;
+ struct create_context *cc;
+ unsigned int next = 0;
+ char *name;
+ struct smb2_create_req *req = (struct smb2_create_req *)open_req;
+
+ data_offset = (char *)req + 4 + le32_to_cpu(req->CreateContextsOffset);
+ cc = (struct create_context *)data_offset;
+ do {
+ int val;
+
+ cc = (struct create_context *)((char *)cc + next);
+ name = le16_to_cpu(cc->NameOffset) + (char *)cc;
+ val = le16_to_cpu(cc->NameLength);
+ if (val < 4)
+ return ERR_PTR(-EINVAL);
+
+ if (memcmp(name, tag, val) == 0)
+ return cc;
+ next = le32_to_cpu(cc->Next);
+ } while (next != 0);
+
+ return ERR_PTR(-ENOENT);
+}
+
+/**
+ * create_durable_rsp_buf() - create durable handle context
+ * @cc: buffer to create durable context response
+ */
+void create_durable_rsp_buf(char *cc)
+{
+ struct create_durable_rsp *buf;
+
+ buf = (struct create_durable_rsp *)cc;
+ memset(buf, 0, sizeof(struct create_durable_rsp));
+ buf->ccontext.DataOffset = cpu_to_le16(offsetof
+ (struct create_durable_rsp, Data));
+ buf->ccontext.DataLength = cpu_to_le32(8);
+ buf->ccontext.NameOffset = cpu_to_le16(offsetof
+ (struct create_durable_rsp, Name));
+ buf->ccontext.NameLength = cpu_to_le16(4);
+ /* SMB2_CREATE_DURABLE_HANDLE_RESPONSE is "DHnQ" */
+ buf->Name[0] = 'D';
+ buf->Name[1] = 'H';
+ buf->Name[2] = 'n';
+ buf->Name[3] = 'Q';
+}
+
+/**
+ * create_durable_v2_rsp_buf() - create durable handle v2 context
+ * @cc: buffer to create durable context response
+ * @fp: ksmbd file pointer
+ */
+void create_durable_v2_rsp_buf(char *cc, struct ksmbd_file *fp)
+{
+ struct create_durable_v2_rsp *buf;
+
+ buf = (struct create_durable_v2_rsp *)cc;
+ memset(buf, 0, sizeof(struct create_durable_rsp));
+ buf->ccontext.DataOffset = cpu_to_le16(offsetof
+ (struct create_durable_rsp, Data));
+ buf->ccontext.DataLength = cpu_to_le32(8);
+ buf->ccontext.NameOffset = cpu_to_le16(offsetof
+ (struct create_durable_rsp, Name));
+ buf->ccontext.NameLength = cpu_to_le16(4);
+ /* SMB2_CREATE_DURABLE_HANDLE_RESPONSE_V2 is "DH2Q" */
+ buf->Name[0] = 'D';
+ buf->Name[1] = 'H';
+ buf->Name[2] = '2';
+ buf->Name[3] = 'Q';
+
+ buf->Timeout = cpu_to_le32(fp->durable_timeout);
+}
+
+/**
+ * create_mxac_rsp_buf() - create query maximal access context
+ * @cc: buffer to create maximal access context response
+ * @maximal_access: maximal access
+ */
+void create_mxac_rsp_buf(char *cc, int maximal_access)
+{
+ struct create_mxac_rsp *buf;
+
+ buf = (struct create_mxac_rsp *)cc;
+ memset(buf, 0, sizeof(struct create_mxac_rsp));
+ buf->ccontext.DataOffset = cpu_to_le16(offsetof
+ (struct create_mxac_rsp, QueryStatus));
+ buf->ccontext.DataLength = cpu_to_le32(8);
+ buf->ccontext.NameOffset = cpu_to_le16(offsetof
+ (struct create_mxac_rsp, Name));
+ buf->ccontext.NameLength = cpu_to_le16(4);
+ /* SMB2_CREATE_QUERY_MAXIMAL_ACCESS_RESPONSE is "MxAc" */
+ buf->Name[0] = 'M';
+ buf->Name[1] = 'x';
+ buf->Name[2] = 'A';
+ buf->Name[3] = 'c';
+
+ buf->QueryStatus = STATUS_SUCCESS;
+ buf->MaximalAccess = cpu_to_le32(maximal_access);
+}
+
+void create_disk_id_rsp_buf(char *cc, __u64 file_id, __u64 vol_id)
+{
+ struct create_disk_id_rsp *buf;
+
+ buf = (struct create_disk_id_rsp *)cc;
+ memset(buf, 0, sizeof(struct create_disk_id_rsp));
+ buf->ccontext.DataOffset = cpu_to_le16(offsetof
+ (struct create_disk_id_rsp, DiskFileId));
+ buf->ccontext.DataLength = cpu_to_le32(32);
+ buf->ccontext.NameOffset = cpu_to_le16(offsetof
+ (struct create_mxac_rsp, Name));
+ buf->ccontext.NameLength = cpu_to_le16(4);
+ /* SMB2_CREATE_QUERY_ON_DISK_ID_RESPONSE is "QFid" */
+ buf->Name[0] = 'Q';
+ buf->Name[1] = 'F';
+ buf->Name[2] = 'i';
+ buf->Name[3] = 'd';
+
+ buf->DiskFileId = cpu_to_le64(file_id);
+ buf->VolumeId = cpu_to_le64(vol_id);
+}
+
+/**
+ * create_posix_rsp_buf() - create posix extension context
+ * @cc: buffer to create posix on posix response
+ * @fp: ksmbd file pointer
+ */
+void create_posix_rsp_buf(char *cc, struct ksmbd_file *fp)
+{
+ struct create_posix_rsp *buf;
+ struct inode *inode = FP_INODE(fp);
+
+ buf = (struct create_posix_rsp *)cc;
+ memset(buf, 0, sizeof(struct create_posix_rsp));
+ buf->ccontext.DataOffset = cpu_to_le16(offsetof
+ (struct create_posix_rsp, nlink));
+ buf->ccontext.DataLength = cpu_to_le32(52);
+ buf->ccontext.NameOffset = cpu_to_le16(offsetof
+ (struct create_posix_rsp, Name));
+ buf->ccontext.NameLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
+ /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
+ buf->Name[0] = 0x93;
+ buf->Name[1] = 0xAD;
+ buf->Name[2] = 0x25;
+ buf->Name[3] = 0x50;
+ buf->Name[4] = 0x9C;
+ buf->Name[5] = 0xB4;
+ buf->Name[6] = 0x11;
+ buf->Name[7] = 0xE7;
+ buf->Name[8] = 0xB4;
+ buf->Name[9] = 0x23;
+ buf->Name[10] = 0x83;
+ buf->Name[11] = 0xDE;
+ buf->Name[12] = 0x96;
+ buf->Name[13] = 0x8B;
+ buf->Name[14] = 0xCD;
+ buf->Name[15] = 0x7C;
+
+ buf->nlink = cpu_to_le32(inode->i_nlink);
+ buf->reparse_tag = cpu_to_le32(fp->volatile_id);
+ buf->mode = cpu_to_le32(inode->i_mode);
+ id_to_sid(from_kuid(&init_user_ns, inode->i_uid),
+ SIDNFS_USER, (struct smb_sid *)&buf->SidBuffer[0]);
+ id_to_sid(from_kgid(&init_user_ns, inode->i_gid),
+ SIDNFS_GROUP, (struct smb_sid *)&buf->SidBuffer[20]);
+}
+
+/*
+ * Find lease object(opinfo) for given lease key/fid from lease
+ * break/file close path.
+ */
+/**
+ * lookup_lease_in_table() - find a matching lease info object
+ * @conn: connection instance
+ * @lease_key: lease key to be searched for
+ *
+ * Return: opinfo if found matching opinfo, otherwise NULL
+ */
+struct oplock_info *lookup_lease_in_table(struct ksmbd_conn *conn,
+ char *lease_key)
+{
+ struct oplock_info *opinfo = NULL, *ret_op = NULL;
+ struct lease_table *lt;
+ int ret;
+
+ read_lock(&lease_list_lock);
+ list_for_each_entry(lt, &lease_table_list, l_entry) {
+ if (!memcmp(lt->client_guid, conn->ClientGUID,
+ SMB2_CLIENT_GUID_SIZE))
+ goto found;
+ }
+
+ read_unlock(&lease_list_lock);
+ return NULL;
+
+found:
+ rcu_read_lock();
+ list_for_each_entry_rcu(opinfo, &lt->lease_list, lease_entry) {
+ if (!atomic_inc_not_zero(&opinfo->refcount))
+ continue;
+ rcu_read_unlock();
+ if (!opinfo->op_state || opinfo->op_state == OPLOCK_CLOSING)
+ goto op_next;
+ if (!(opinfo->o_lease->state &
+ (SMB2_LEASE_HANDLE_CACHING_LE |
+ SMB2_LEASE_WRITE_CACHING_LE)))
+ goto op_next;
+ ret = compare_guid_key(opinfo, conn->ClientGUID,
+ lease_key);
+ if (ret) {
+ ksmbd_debug(OPLOCK, "found opinfo\n");
+ ret_op = opinfo;
+ goto out;
+ }
+op_next:
+ opinfo_put(opinfo);
+ rcu_read_lock();
+ }
+ rcu_read_unlock();
+
+out:
+ read_unlock(&lease_list_lock);
+ return ret_op;
+}
+
+int smb2_check_durable_oplock(struct ksmbd_file *fp,
+ struct lease_ctx_info *lctx, char *name)
+{
+ struct oplock_info *opinfo = opinfo_get(fp);
+ int ret = 0;
+
+ if (opinfo && opinfo->is_lease) {
+ if (!lctx) {
+ ksmbd_err("open does not include lease\n");
+ ret = -EBADF;
+ goto out;
+ }
+ if (memcmp(opinfo->o_lease->lease_key, lctx->lease_key,
+ SMB2_LEASE_KEY_SIZE)) {
+ ksmbd_err("invalid lease key\n");
+ ret = -EBADF;
+ goto out;
+ }
+ if (name && strcmp(fp->filename, name)) {
+ ksmbd_err("invalid name reconnect %s\n", name);
+ ret = -EINVAL;
+ goto out;
+ }
+ }
+out:
+ if (opinfo)
+ opinfo_put(opinfo);
+ return ret;
+}
diff --git a/fs/cifsd/oplock.h b/fs/cifsd/oplock.h
new file mode 100644
index 000000000000..0abd26123f6d
--- /dev/null
+++ b/fs/cifsd/oplock.h
@@ -0,0 +1,132 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2016 Namjae Jeon <linkinjeon@kernel.org>
+ * Copyright (C) 2018 Samsung Electronics Co., Ltd.
+ */
+
+#ifndef __KSMBD_OPLOCK_H
+#define __KSMBD_OPLOCK_H
+
+#include "smb_common.h"
+
+#define OPLOCK_WAIT_TIME (35 * HZ)
+
+/* SMB Oplock levels */
+#define OPLOCK_NONE 0
+#define OPLOCK_EXCLUSIVE 1
+#define OPLOCK_BATCH 2
+#define OPLOCK_READ 3 /* level 2 oplock */
+
+/* SMB2 Oplock levels */
+#define SMB2_OPLOCK_LEVEL_NONE 0x00
+#define SMB2_OPLOCK_LEVEL_II 0x01
+#define SMB2_OPLOCK_LEVEL_EXCLUSIVE 0x08
+#define SMB2_OPLOCK_LEVEL_BATCH 0x09
+#define SMB2_OPLOCK_LEVEL_LEASE 0xFF
+
+/* Oplock states */
+#define OPLOCK_STATE_NONE 0x00
+#define OPLOCK_ACK_WAIT 0x01
+#define OPLOCK_CLOSING 0x02
+
+#define OPLOCK_WRITE_TO_READ 0x01
+#define OPLOCK_READ_HANDLE_TO_READ 0x02
+#define OPLOCK_WRITE_TO_NONE 0x04
+#define OPLOCK_READ_TO_NONE 0x08
+
+#define SMB2_LEASE_KEY_SIZE 16
+
+struct lease_ctx_info {
+ __u8 lease_key[SMB2_LEASE_KEY_SIZE];
+ __le32 req_state;
+ __le32 flags;
+ __le64 duration;
+ int dlease;
+};
+
+struct lease_table {
+ char client_guid[SMB2_CLIENT_GUID_SIZE];
+ struct list_head lease_list;
+ struct list_head l_entry;
+ spinlock_t lb_lock;
+};
+
+struct lease {
+ __u8 lease_key[SMB2_LEASE_KEY_SIZE];
+ __le32 state;
+ __le32 new_state;
+ __le32 flags;
+ __le64 duration;
+ struct lease_table *l_lb;
+};
+
+struct oplock_info {
+ struct ksmbd_conn *conn;
+ struct ksmbd_session *sess;
+ struct ksmbd_work *work;
+ struct ksmbd_file *o_fp;
+ int level;
+ int op_state;
+ unsigned long pending_break;
+ u64 fid;
+ atomic_t breaking_cnt;
+ atomic_t refcount;
+ __u16 Tid;
+ bool is_lease;
+ bool open_trunc; /* truncate on open */
+ struct lease *o_lease;
+ struct list_head interim_list;
+ struct list_head op_entry;
+ struct list_head lease_entry;
+ wait_queue_head_t oplock_q; /* Other server threads */
+ wait_queue_head_t oplock_brk; /* oplock breaking wait */
+ struct rcu_head rcu_head;
+};
+
+struct lease_break_info {
+ __le32 curr_state;
+ __le32 new_state;
+ char lease_key[SMB2_LEASE_KEY_SIZE];
+};
+
+struct oplock_break_info {
+ int level;
+ int open_trunc;
+ int fid;
+};
+
+int smb_grant_oplock(struct ksmbd_work *work, int req_op_level,
+ u64 pid, struct ksmbd_file *fp, __u16 tid,
+ struct lease_ctx_info *lctx, int share_ret);
+void smb_break_all_levII_oplock(struct ksmbd_work *work,
+ struct ksmbd_file *fp, int is_trunc);
+int opinfo_write_to_read(struct oplock_info *opinfo);
+int opinfo_read_handle_to_read(struct oplock_info *opinfo);
+int opinfo_write_to_none(struct oplock_info *opinfo);
+int opinfo_read_to_none(struct oplock_info *opinfo);
+void close_id_del_oplock(struct ksmbd_file *fp);
+void smb_break_all_oplock(struct ksmbd_work *work, struct ksmbd_file *fp);
+struct oplock_info *opinfo_get(struct ksmbd_file *fp);
+void opinfo_put(struct oplock_info *opinfo);
+
+/* Lease related functions */
+void create_lease_buf(u8 *rbuf, struct lease *lease);
+struct lease_ctx_info *parse_lease_state(void *open_req);
+__u8 smb2_map_lease_to_oplock(__le32 lease_state);
+int lease_read_to_write(struct oplock_info *opinfo);
+
+/* Durable related functions */
+void create_durable_rsp_buf(char *cc);
+void create_durable_v2_rsp_buf(char *cc, struct ksmbd_file *fp);
+void create_mxac_rsp_buf(char *cc, int maximal_access);
+void create_disk_id_rsp_buf(char *cc, __u64 file_id, __u64 vol_id);
+void create_posix_rsp_buf(char *cc, struct ksmbd_file *fp);
+struct create_context *smb2_find_context_vals(void *open_req, const char *str);
+struct oplock_info *lookup_lease_in_table(struct ksmbd_conn *conn,
+ char *lease_key);
+int find_same_lease_key(struct ksmbd_session *sess, struct ksmbd_inode *ci,
+ struct lease_ctx_info *lctx);
+void destroy_lease_table(struct ksmbd_conn *conn);
+int smb2_check_durable_oplock(struct ksmbd_file *fp,
+ struct lease_ctx_info *lctx, char *name);
+#endif /* __KSMBD_OPLOCK_H */
--
2.17.1