1718 строки
45 KiB
C
1718 строки
45 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2016 Namjae Jeon <linkinjeon@kernel.org>
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* Copyright (C) 2018 Samsung Electronics Co., Ltd.
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*/
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#include <linux/moduleparam.h>
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#include "glob.h"
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#include "oplock.h"
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#include "smb_common.h"
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#include "smbstatus.h"
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#include "connection.h"
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#include "mgmt/user_session.h"
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#include "mgmt/share_config.h"
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#include "mgmt/tree_connect.h"
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static LIST_HEAD(lease_table_list);
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static DEFINE_RWLOCK(lease_list_lock);
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/**
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* alloc_opinfo() - allocate a new opinfo object for oplock info
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* @work: smb work
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* @id: fid of open file
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* @Tid: tree id of connection
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*
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* Return: allocated opinfo object on success, otherwise NULL
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*/
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static struct oplock_info *alloc_opinfo(struct ksmbd_work *work,
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u64 id, __u16 Tid)
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{
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struct ksmbd_conn *conn = work->conn;
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struct ksmbd_session *sess = work->sess;
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struct oplock_info *opinfo;
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opinfo = kzalloc(sizeof(struct oplock_info), GFP_KERNEL);
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if (!opinfo)
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return NULL;
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opinfo->sess = sess;
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opinfo->conn = conn;
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opinfo->level = SMB2_OPLOCK_LEVEL_NONE;
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opinfo->op_state = OPLOCK_STATE_NONE;
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opinfo->pending_break = 0;
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opinfo->fid = id;
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opinfo->Tid = Tid;
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INIT_LIST_HEAD(&opinfo->op_entry);
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INIT_LIST_HEAD(&opinfo->interim_list);
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init_waitqueue_head(&opinfo->oplock_q);
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init_waitqueue_head(&opinfo->oplock_brk);
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atomic_set(&opinfo->refcount, 1);
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atomic_set(&opinfo->breaking_cnt, 0);
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return opinfo;
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}
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static void lease_add_list(struct oplock_info *opinfo)
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{
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struct lease_table *lb = opinfo->o_lease->l_lb;
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spin_lock(&lb->lb_lock);
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list_add_rcu(&opinfo->lease_entry, &lb->lease_list);
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spin_unlock(&lb->lb_lock);
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}
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static void lease_del_list(struct oplock_info *opinfo)
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{
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struct lease_table *lb = opinfo->o_lease->l_lb;
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if (!lb)
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return;
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spin_lock(&lb->lb_lock);
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if (list_empty(&opinfo->lease_entry)) {
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spin_unlock(&lb->lb_lock);
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return;
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}
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list_del_init(&opinfo->lease_entry);
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opinfo->o_lease->l_lb = NULL;
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spin_unlock(&lb->lb_lock);
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}
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static void lb_add(struct lease_table *lb)
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{
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write_lock(&lease_list_lock);
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list_add(&lb->l_entry, &lease_table_list);
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write_unlock(&lease_list_lock);
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}
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static int alloc_lease(struct oplock_info *opinfo, struct lease_ctx_info *lctx)
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{
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struct lease *lease;
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lease = kmalloc(sizeof(struct lease), GFP_KERNEL);
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if (!lease)
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return -ENOMEM;
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memcpy(lease->lease_key, lctx->lease_key, SMB2_LEASE_KEY_SIZE);
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lease->state = lctx->req_state;
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lease->new_state = 0;
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lease->flags = lctx->flags;
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lease->duration = lctx->duration;
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memcpy(lease->parent_lease_key, lctx->parent_lease_key, SMB2_LEASE_KEY_SIZE);
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lease->version = lctx->version;
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lease->epoch = 0;
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INIT_LIST_HEAD(&opinfo->lease_entry);
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opinfo->o_lease = lease;
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return 0;
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}
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static void free_lease(struct oplock_info *opinfo)
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{
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struct lease *lease;
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lease = opinfo->o_lease;
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kfree(lease);
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}
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static void free_opinfo(struct oplock_info *opinfo)
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{
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if (opinfo->is_lease)
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free_lease(opinfo);
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kfree(opinfo);
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}
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static inline void opinfo_free_rcu(struct rcu_head *rcu_head)
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{
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struct oplock_info *opinfo;
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opinfo = container_of(rcu_head, struct oplock_info, rcu_head);
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free_opinfo(opinfo);
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}
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struct oplock_info *opinfo_get(struct ksmbd_file *fp)
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{
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struct oplock_info *opinfo;
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rcu_read_lock();
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opinfo = rcu_dereference(fp->f_opinfo);
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if (opinfo && !atomic_inc_not_zero(&opinfo->refcount))
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opinfo = NULL;
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rcu_read_unlock();
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return opinfo;
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}
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static struct oplock_info *opinfo_get_list(struct ksmbd_inode *ci)
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{
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struct oplock_info *opinfo;
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if (list_empty(&ci->m_op_list))
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return NULL;
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rcu_read_lock();
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opinfo = list_first_or_null_rcu(&ci->m_op_list, struct oplock_info,
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op_entry);
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if (opinfo && !atomic_inc_not_zero(&opinfo->refcount))
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opinfo = NULL;
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rcu_read_unlock();
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return opinfo;
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}
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void opinfo_put(struct oplock_info *opinfo)
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{
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if (!atomic_dec_and_test(&opinfo->refcount))
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return;
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call_rcu(&opinfo->rcu_head, opinfo_free_rcu);
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}
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static void opinfo_add(struct oplock_info *opinfo)
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{
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struct ksmbd_inode *ci = opinfo->o_fp->f_ci;
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write_lock(&ci->m_lock);
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list_add_rcu(&opinfo->op_entry, &ci->m_op_list);
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write_unlock(&ci->m_lock);
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}
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static void opinfo_del(struct oplock_info *opinfo)
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{
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struct ksmbd_inode *ci = opinfo->o_fp->f_ci;
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if (opinfo->is_lease) {
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write_lock(&lease_list_lock);
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lease_del_list(opinfo);
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write_unlock(&lease_list_lock);
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}
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write_lock(&ci->m_lock);
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list_del_rcu(&opinfo->op_entry);
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write_unlock(&ci->m_lock);
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}
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static unsigned long opinfo_count(struct ksmbd_file *fp)
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{
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if (ksmbd_stream_fd(fp))
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return atomic_read(&fp->f_ci->sop_count);
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else
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return atomic_read(&fp->f_ci->op_count);
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}
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static void opinfo_count_inc(struct ksmbd_file *fp)
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{
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if (ksmbd_stream_fd(fp))
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return atomic_inc(&fp->f_ci->sop_count);
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else
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return atomic_inc(&fp->f_ci->op_count);
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}
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static void opinfo_count_dec(struct ksmbd_file *fp)
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{
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if (ksmbd_stream_fd(fp))
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return atomic_dec(&fp->f_ci->sop_count);
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else
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return atomic_dec(&fp->f_ci->op_count);
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}
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/**
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* opinfo_write_to_read() - convert a write oplock to read oplock
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* @opinfo: current oplock info
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*
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* Return: 0 on success, otherwise -EINVAL
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*/
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int opinfo_write_to_read(struct oplock_info *opinfo)
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{
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struct lease *lease = opinfo->o_lease;
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if (!(opinfo->level == SMB2_OPLOCK_LEVEL_BATCH ||
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opinfo->level == SMB2_OPLOCK_LEVEL_EXCLUSIVE)) {
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pr_err("bad oplock(0x%x)\n", opinfo->level);
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if (opinfo->is_lease)
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pr_err("lease state(0x%x)\n", lease->state);
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return -EINVAL;
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}
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opinfo->level = SMB2_OPLOCK_LEVEL_II;
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if (opinfo->is_lease)
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lease->state = lease->new_state;
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return 0;
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}
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/**
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* opinfo_read_handle_to_read() - convert a read/handle oplock to read oplock
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* @opinfo: current oplock info
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*
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* Return: 0 on success, otherwise -EINVAL
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*/
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int opinfo_read_handle_to_read(struct oplock_info *opinfo)
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{
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struct lease *lease = opinfo->o_lease;
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lease->state = lease->new_state;
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opinfo->level = SMB2_OPLOCK_LEVEL_II;
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return 0;
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}
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/**
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* opinfo_write_to_none() - convert a write oplock to none
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* @opinfo: current oplock info
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*
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* Return: 0 on success, otherwise -EINVAL
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*/
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int opinfo_write_to_none(struct oplock_info *opinfo)
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{
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struct lease *lease = opinfo->o_lease;
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if (!(opinfo->level == SMB2_OPLOCK_LEVEL_BATCH ||
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opinfo->level == SMB2_OPLOCK_LEVEL_EXCLUSIVE)) {
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pr_err("bad oplock(0x%x)\n", opinfo->level);
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if (opinfo->is_lease)
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pr_err("lease state(0x%x)\n", lease->state);
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return -EINVAL;
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}
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opinfo->level = SMB2_OPLOCK_LEVEL_NONE;
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if (opinfo->is_lease)
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lease->state = lease->new_state;
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return 0;
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}
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/**
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* opinfo_read_to_none() - convert a write read to none
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* @opinfo: current oplock info
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*
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* Return: 0 on success, otherwise -EINVAL
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*/
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int opinfo_read_to_none(struct oplock_info *opinfo)
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{
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struct lease *lease = opinfo->o_lease;
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if (opinfo->level != SMB2_OPLOCK_LEVEL_II) {
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pr_err("bad oplock(0x%x)\n", opinfo->level);
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if (opinfo->is_lease)
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pr_err("lease state(0x%x)\n", lease->state);
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return -EINVAL;
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}
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opinfo->level = SMB2_OPLOCK_LEVEL_NONE;
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if (opinfo->is_lease)
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lease->state = lease->new_state;
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return 0;
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}
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/**
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* lease_read_to_write() - upgrade lease state from read to write
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* @opinfo: current lease info
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*
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* Return: 0 on success, otherwise -EINVAL
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*/
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int lease_read_to_write(struct oplock_info *opinfo)
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{
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struct lease *lease = opinfo->o_lease;
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if (!(lease->state & SMB2_LEASE_READ_CACHING_LE)) {
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ksmbd_debug(OPLOCK, "bad lease state(0x%x)\n", lease->state);
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return -EINVAL;
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}
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lease->new_state = SMB2_LEASE_NONE_LE;
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lease->state |= SMB2_LEASE_WRITE_CACHING_LE;
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if (lease->state & SMB2_LEASE_HANDLE_CACHING_LE)
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opinfo->level = SMB2_OPLOCK_LEVEL_BATCH;
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else
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opinfo->level = SMB2_OPLOCK_LEVEL_EXCLUSIVE;
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return 0;
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}
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/**
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* lease_none_upgrade() - upgrade lease state from none
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* @opinfo: current lease info
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* @new_state: new lease state
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*
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* Return: 0 on success, otherwise -EINVAL
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*/
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static int lease_none_upgrade(struct oplock_info *opinfo, __le32 new_state)
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{
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struct lease *lease = opinfo->o_lease;
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if (!(lease->state == SMB2_LEASE_NONE_LE)) {
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ksmbd_debug(OPLOCK, "bad lease state(0x%x)\n", lease->state);
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return -EINVAL;
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}
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lease->new_state = SMB2_LEASE_NONE_LE;
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lease->state = new_state;
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if (lease->state & SMB2_LEASE_HANDLE_CACHING_LE)
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if (lease->state & SMB2_LEASE_WRITE_CACHING_LE)
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opinfo->level = SMB2_OPLOCK_LEVEL_BATCH;
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else
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opinfo->level = SMB2_OPLOCK_LEVEL_II;
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else if (lease->state & SMB2_LEASE_WRITE_CACHING_LE)
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opinfo->level = SMB2_OPLOCK_LEVEL_EXCLUSIVE;
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else if (lease->state & SMB2_LEASE_READ_CACHING_LE)
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opinfo->level = SMB2_OPLOCK_LEVEL_II;
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return 0;
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}
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/**
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* close_id_del_oplock() - release oplock object at file close time
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* @fp: ksmbd file pointer
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*/
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void close_id_del_oplock(struct ksmbd_file *fp)
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{
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struct oplock_info *opinfo;
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if (S_ISDIR(file_inode(fp->filp)->i_mode))
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return;
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opinfo = opinfo_get(fp);
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if (!opinfo)
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return;
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opinfo_del(opinfo);
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rcu_assign_pointer(fp->f_opinfo, NULL);
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if (opinfo->op_state == OPLOCK_ACK_WAIT) {
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opinfo->op_state = OPLOCK_CLOSING;
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wake_up_interruptible_all(&opinfo->oplock_q);
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if (opinfo->is_lease) {
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atomic_set(&opinfo->breaking_cnt, 0);
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wake_up_interruptible_all(&opinfo->oplock_brk);
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}
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}
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opinfo_count_dec(fp);
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atomic_dec(&opinfo->refcount);
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opinfo_put(opinfo);
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}
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/**
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* grant_write_oplock() - grant exclusive/batch oplock or write lease
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* @opinfo_new: new oplock info object
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* @req_oplock: request oplock
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* @lctx: lease context information
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*
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* Return: 0
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*/
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static void grant_write_oplock(struct oplock_info *opinfo_new, int req_oplock,
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struct lease_ctx_info *lctx)
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{
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struct lease *lease = opinfo_new->o_lease;
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if (req_oplock == SMB2_OPLOCK_LEVEL_BATCH)
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opinfo_new->level = SMB2_OPLOCK_LEVEL_BATCH;
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else
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opinfo_new->level = SMB2_OPLOCK_LEVEL_EXCLUSIVE;
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if (lctx) {
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lease->state = lctx->req_state;
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memcpy(lease->lease_key, lctx->lease_key, SMB2_LEASE_KEY_SIZE);
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}
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}
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/**
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* grant_read_oplock() - grant level2 oplock or read lease
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* @opinfo_new: new oplock info object
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* @lctx: lease context information
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*
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* Return: 0
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*/
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static void grant_read_oplock(struct oplock_info *opinfo_new,
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struct lease_ctx_info *lctx)
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{
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struct lease *lease = opinfo_new->o_lease;
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opinfo_new->level = SMB2_OPLOCK_LEVEL_II;
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if (lctx) {
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lease->state = SMB2_LEASE_READ_CACHING_LE;
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if (lctx->req_state & SMB2_LEASE_HANDLE_CACHING_LE)
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lease->state |= SMB2_LEASE_HANDLE_CACHING_LE;
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memcpy(lease->lease_key, lctx->lease_key, SMB2_LEASE_KEY_SIZE);
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}
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}
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/**
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* grant_none_oplock() - grant none oplock or none lease
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* @opinfo_new: new oplock info object
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* @lctx: lease context information
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*
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* Return: 0
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*/
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static void grant_none_oplock(struct oplock_info *opinfo_new,
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struct lease_ctx_info *lctx)
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{
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struct lease *lease = opinfo_new->o_lease;
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opinfo_new->level = SMB2_OPLOCK_LEVEL_NONE;
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if (lctx) {
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lease->state = 0;
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memcpy(lease->lease_key, lctx->lease_key, SMB2_LEASE_KEY_SIZE);
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}
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}
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static inline int compare_guid_key(struct oplock_info *opinfo,
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const char *guid1, const char *key1)
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{
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const char *guid2, *key2;
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guid2 = opinfo->conn->ClientGUID;
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key2 = opinfo->o_lease->lease_key;
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if (!memcmp(guid1, guid2, SMB2_CLIENT_GUID_SIZE) &&
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!memcmp(key1, key2, SMB2_LEASE_KEY_SIZE))
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return 1;
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return 0;
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}
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/**
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* same_client_has_lease() - check whether current lease request is
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* from lease owner of file
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* @ci: master file pointer
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* @client_guid: Client GUID
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* @lctx: lease context information
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*
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* Return: oplock(lease) object on success, otherwise NULL
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*/
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static struct oplock_info *same_client_has_lease(struct ksmbd_inode *ci,
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char *client_guid,
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struct lease_ctx_info *lctx)
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{
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int ret;
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struct lease *lease;
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struct oplock_info *opinfo;
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struct oplock_info *m_opinfo = NULL;
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if (!lctx)
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return NULL;
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/*
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* Compare lease key and client_guid to know request from same owner
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* of same client
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*/
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read_lock(&ci->m_lock);
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list_for_each_entry(opinfo, &ci->m_op_list, op_entry) {
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if (!opinfo->is_lease)
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continue;
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read_unlock(&ci->m_lock);
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lease = opinfo->o_lease;
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ret = compare_guid_key(opinfo, client_guid, lctx->lease_key);
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if (ret) {
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m_opinfo = opinfo;
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/* skip upgrading lease about breaking lease */
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if (atomic_read(&opinfo->breaking_cnt)) {
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read_lock(&ci->m_lock);
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continue;
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}
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/* upgrading lease */
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if ((atomic_read(&ci->op_count) +
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|
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)
|
|
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 = fp->persistent_id;
|
|
rsp->VolatileFid = 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
|
|
* @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;
|
|
if (lease->version == 2)
|
|
br_info->epoch = cpu_to_le16(++lease->epoch);
|
|
else
|
|
br_info->epoch = 0;
|
|
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->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->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))
|
|
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 (fp->attrib_only && fp->cdoption != FILE_OVERWRITE_IF_LE &&
|
|
fp->cdoption != FILE_OVERWRITE_LE &&
|
|
fp->cdoption != FILE_SUPERSEDE_LE) {
|
|
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->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->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)
|
|
{
|
|
if (lease->version == 2) {
|
|
struct create_lease_v2 *buf = (struct create_lease_v2 *)rbuf;
|
|
|
|
memset(buf, 0, sizeof(struct create_lease_v2));
|
|
memcpy(buf->lcontext.LeaseKey, lease->lease_key,
|
|
SMB2_LEASE_KEY_SIZE);
|
|
buf->lcontext.LeaseFlags = lease->flags;
|
|
buf->lcontext.LeaseState = lease->state;
|
|
memcpy(buf->lcontext.ParentLeaseKey, lease->parent_lease_key,
|
|
SMB2_LEASE_KEY_SIZE);
|
|
buf->ccontext.DataOffset = cpu_to_le16(offsetof
|
|
(struct create_lease_v2, lcontext));
|
|
buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context_v2));
|
|
buf->ccontext.NameOffset = cpu_to_le16(offsetof
|
|
(struct create_lease_v2, Name));
|
|
buf->ccontext.NameLength = cpu_to_le16(4);
|
|
buf->Name[0] = 'R';
|
|
buf->Name[1] = 'q';
|
|
buf->Name[2] = 'L';
|
|
buf->Name[3] = 's';
|
|
} else {
|
|
struct create_lease *buf = (struct create_lease *)rbuf;
|
|
|
|
memset(buf, 0, sizeof(struct create_lease));
|
|
memcpy(buf->lcontext.LeaseKey, lease->lease_key, SMB2_LEASE_KEY_SIZE);
|
|
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 + 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) {
|
|
if (sizeof(struct lease_context_v2) == le32_to_cpu(cc->DataLength)) {
|
|
struct create_lease_v2 *lc = (struct create_lease_v2 *)cc;
|
|
|
|
memcpy(lreq->lease_key, lc->lcontext.LeaseKey, SMB2_LEASE_KEY_SIZE);
|
|
lreq->req_state = lc->lcontext.LeaseState;
|
|
lreq->flags = lc->lcontext.LeaseFlags;
|
|
lreq->duration = lc->lcontext.LeaseDuration;
|
|
memcpy(lreq->parent_lease_key, lc->lcontext.ParentLeaseKey,
|
|
SMB2_LEASE_KEY_SIZE);
|
|
lreq->version = 2;
|
|
} else {
|
|
struct create_lease *lc = (struct create_lease *)cc;
|
|
|
|
memcpy(lreq->lease_key, lc->lcontext.LeaseKey, SMB2_LEASE_KEY_SIZE);
|
|
lreq->req_state = lc->lcontext.LeaseState;
|
|
lreq->flags = lc->lcontext.LeaseFlags;
|
|
lreq->duration = lc->lcontext.LeaseDuration;
|
|
lreq->version = 1;
|
|
}
|
|
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
|
|
* or error pointer if name length is invalid.
|
|
*/
|
|
struct create_context *smb2_find_context_vals(void *open_req, const char *tag)
|
|
{
|
|
struct create_context *cc;
|
|
unsigned int next = 0;
|
|
char *name;
|
|
struct smb2_create_req *req = (struct smb2_create_req *)open_req;
|
|
unsigned int remain_len, name_off, name_len, value_off, value_len,
|
|
cc_len;
|
|
|
|
/*
|
|
* CreateContextsOffset and CreateContextsLength are guaranteed to
|
|
* be valid because of ksmbd_smb2_check_message().
|
|
*/
|
|
cc = (struct create_context *)((char *)req +
|
|
le32_to_cpu(req->CreateContextsOffset));
|
|
remain_len = le32_to_cpu(req->CreateContextsLength);
|
|
do {
|
|
cc = (struct create_context *)((char *)cc + next);
|
|
if (remain_len < offsetof(struct create_context, Buffer))
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
next = le32_to_cpu(cc->Next);
|
|
name_off = le16_to_cpu(cc->NameOffset);
|
|
name_len = le16_to_cpu(cc->NameLength);
|
|
value_off = le16_to_cpu(cc->DataOffset);
|
|
value_len = le32_to_cpu(cc->DataLength);
|
|
cc_len = next ? next : remain_len;
|
|
|
|
if ((next & 0x7) != 0 ||
|
|
next > remain_len ||
|
|
name_off != offsetof(struct create_context, Buffer) ||
|
|
name_len < 4 ||
|
|
name_off + name_len > cc_len ||
|
|
(value_off & 0x7) != 0 ||
|
|
(value_off && (value_off < name_off + name_len)) ||
|
|
((u64)value_off + value_len > cc_len))
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
name = (char *)cc + name_off;
|
|
if (memcmp(name, tag, name_len) == 0)
|
|
return cc;
|
|
|
|
remain_len -= next;
|
|
} while (next != 0);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* 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 = file_inode(fp->filp);
|
|
struct mnt_idmap *idmap = file_mnt_idmap(fp->filp);
|
|
vfsuid_t vfsuid = i_uid_into_vfsuid(idmap, inode);
|
|
vfsgid_t vfsgid = i_gid_into_vfsgid(idmap, inode);
|
|
|
|
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));
|
|
/*
|
|
* DataLength = nlink(4) + reparse_tag(4) + mode(4) +
|
|
* domain sid(28) + unix group sid(16).
|
|
*/
|
|
buf->ccontext.DataLength = cpu_to_le32(56);
|
|
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 & 0777);
|
|
/*
|
|
* SidBuffer(44) contain two sids(Domain sid(28), UNIX group sid(16)).
|
|
* Domain sid(28) = revision(1) + num_subauth(1) + authority(6) +
|
|
* sub_auth(4 * 4(num_subauth)) + RID(4).
|
|
* UNIX group id(16) = revision(1) + num_subauth(1) + authority(6) +
|
|
* sub_auth(4 * 1(num_subauth)) + RID(4).
|
|
*/
|
|
id_to_sid(from_kuid_munged(&init_user_ns, vfsuid_into_kuid(vfsuid)),
|
|
SIDOWNER, (struct smb_sid *)&buf->SidBuffer[0]);
|
|
id_to_sid(from_kgid_munged(&init_user_ns, vfsgid_into_kgid(vfsgid)),
|
|
SIDUNIX_GROUP, (struct smb_sid *)&buf->SidBuffer[28]);
|
|
}
|
|
|
|
/*
|
|
* 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, <->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;
|
|
}
|