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1711 lines
44 KiB
1711 lines
44 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (C) 2016 Namjae Jeon <[email protected]> |
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* Copyright (C) 2018 Samsung Electronics Co., Ltd. |
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*/ |
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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_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 = sess->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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/** |
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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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|
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if (!lctx) |
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return NULL; |
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|
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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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|
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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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|
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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) { |
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if (lease->state == |
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(lctx->req_state & lease->state)) { |
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lease->state |= lctx->req_state; |
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if (lctx->req_state & |
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SMB2_LEASE_WRITE_CACHING_LE) |
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lease_read_to_write(opinfo); |
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} |
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} else if ((atomic_read(&ci->op_count) + |
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atomic_read(&ci->sop_count)) > 1) { |
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if (lctx->req_state == |
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(SMB2_LEASE_READ_CACHING_LE | |
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SMB2_LEASE_HANDLE_CACHING_LE)) |
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lease->state = lctx->req_state; |
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} |
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|
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if (lctx->req_state && lease->state == |
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SMB2_LEASE_NONE_LE) |
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lease_none_upgrade(opinfo, lctx->req_state); |
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} |
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read_lock(&ci->m_lock); |
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} |
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read_unlock(&ci->m_lock); |
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|
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return m_opinfo; |
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} |
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|
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static void wait_for_break_ack(struct oplock_info *opinfo) |
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{ |
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int rc = 0; |
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|
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rc = wait_event_interruptible_timeout(opinfo->oplock_q, |
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opinfo->op_state == OPLOCK_STATE_NONE || |
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opinfo->op_state == OPLOCK_CLOSING, |
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OPLOCK_WAIT_TIME); |
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|
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/* is this a timeout ? */ |
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if (!rc) { |
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if (opinfo->is_lease) |
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opinfo->o_lease->state = SMB2_LEASE_NONE_LE; |
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opinfo->level = SMB2_OPLOCK_LEVEL_NONE; |
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opinfo->op_state = OPLOCK_STATE_NONE; |
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} |
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} |
|
|
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static void wake_up_oplock_break(struct oplock_info *opinfo) |
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{ |
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clear_bit_unlock(0, &opinfo->pending_break); |
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/* memory barrier is needed for wake_up_bit() */ |
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smp_mb__after_atomic(); |
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wake_up_bit(&opinfo->pending_break, 0); |
|
} |
|
|
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static int oplock_break_pending(struct oplock_info *opinfo, int req_op_level) |
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{ |
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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)) { |
|
pr_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(smb2_hdr_size_no_buflen(conn->vals)); |
|
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(smb2_hdr_size_no_buflen(conn->vals)); |
|
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->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(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; |
|
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->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)) |
|
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->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) |
|
{ |
|
char *LeaseKey = (char *)&lease->lease_key; |
|
|
|
if (lease->version == 2) { |
|
struct create_lease_v2 *buf = (struct create_lease_v2 *)rbuf; |
|
char *ParentLeaseKey = (char *)&lease->parent_lease_key; |
|
|
|
memset(buf, 0, sizeof(struct create_lease_v2)); |
|
buf->lcontext.LeaseKeyLow = *((__le64 *)LeaseKey); |
|
buf->lcontext.LeaseKeyHigh = *((__le64 *)(LeaseKey + 8)); |
|
buf->lcontext.LeaseFlags = lease->flags; |
|
buf->lcontext.LeaseState = lease->state; |
|
buf->lcontext.ParentLeaseKeyLow = *((__le64 *)ParentLeaseKey); |
|
buf->lcontext.ParentLeaseKeyHigh = *((__le64 *)(ParentLeaseKey + 8)); |
|
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)); |
|
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) { |
|
if (sizeof(struct lease_context_v2) == le32_to_cpu(cc->DataLength)) { |
|
struct create_lease_v2 *lc = (struct create_lease_v2 *)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; |
|
*((__le64 *)lreq->parent_lease_key) = lc->lcontext.ParentLeaseKeyLow; |
|
*((__le64 *)(lreq->parent_lease_key + 8)) = lc->lcontext.ParentLeaseKeyHigh; |
|
lreq->version = 2; |
|
} else { |
|
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; |
|
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) |
|
{ |
|
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 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 user_namespace *user_ns = file_mnt_user_ns(fp->filp); |
|
|
|
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_munged(&init_user_ns, |
|
i_uid_into_mnt(user_ns, inode)), |
|
SIDNFS_USER, (struct smb_sid *)&buf->SidBuffer[0]); |
|
id_to_sid(from_kgid_munged(&init_user_ns, |
|
i_gid_into_mnt(user_ns, inode)), |
|
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, <->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) { |
|
pr_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)) { |
|
pr_err("invalid lease key\n"); |
|
ret = -EBADF; |
|
goto out; |
|
} |
|
if (name && strcmp(fp->filename, name)) { |
|
pr_err("invalid name reconnect %s\n", name); |
|
ret = -EINVAL; |
|
goto out; |
|
} |
|
} |
|
out: |
|
if (opinfo) |
|
opinfo_put(opinfo); |
|
return ret; |
|
}
|
|
|