summaryrefslogtreecommitdiff
path: root/fs/ksmbd/oplock.c
diff options
context:
space:
mode:
authorSteve French <stfrench@microsoft.com>2023-05-21 20:46:30 -0500
committerSteve French <stfrench@microsoft.com>2023-05-24 16:29:21 -0500
commit38c8a9a52082579090e34c033d439ed2cd1a462d (patch)
treeca6c3bf5b2b912f32735c1aa0a045cd21a47a205 /fs/ksmbd/oplock.c
parentcb8b02fd6343228966324528adf920bfb8b8e681 (diff)
downloadlwn-38c8a9a52082579090e34c033d439ed2cd1a462d.tar.gz
lwn-38c8a9a52082579090e34c033d439ed2cd1a462d.zip
smb: move client and server files to common directory fs/smb
Move CIFS/SMB3 related client and server files (cifs.ko and ksmbd.ko and helper modules) to new fs/smb subdirectory: fs/cifs --> fs/smb/client fs/ksmbd --> fs/smb/server fs/smbfs_common --> fs/smb/common Suggested-by: Linus Torvalds <torvalds@linux-foundation.org> Acked-by: Namjae Jeon <linkinjeon@kernel.org> Signed-off-by: Steve French <stfrench@microsoft.com>
Diffstat (limited to 'fs/ksmbd/oplock.c')
-rw-r--r--fs/ksmbd/oplock.c1718
1 files changed, 0 insertions, 1718 deletions
diff --git a/fs/ksmbd/oplock.c b/fs/ksmbd/oplock.c
deleted file mode 100644
index 6d1ccb999893..000000000000
--- a/fs/ksmbd/oplock.c
+++ /dev/null
@@ -1,1718 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * Copyright (C) 2016 Namjae Jeon <linkinjeon@kernel.org>
- * Copyright (C) 2018 Samsung Electronics Co., Ltd.
- */
-
-#include <linux/moduleparam.h>
-
-#include "glob.h"
-#include "oplock.h"
-
-#include "smb_common.h"
-#include "smbstatus.h"
-#include "connection.h"
-#include "mgmt/user_session.h"
-#include "mgmt/share_config.h"
-#include "mgmt/tree_connect.h"
-
-static LIST_HEAD(lease_table_list);
-static DEFINE_RWLOCK(lease_list_lock);
-
-/**
- * alloc_opinfo() - allocate a new opinfo object for oplock info
- * @work: smb work
- * @id: fid of open file
- * @Tid: tree id of connection
- *
- * Return: allocated opinfo object on success, otherwise NULL
- */
-static struct oplock_info *alloc_opinfo(struct ksmbd_work *work,
- u64 id, __u16 Tid)
-{
- struct ksmbd_conn *conn = work->conn;
- struct ksmbd_session *sess = work->sess;
- struct oplock_info *opinfo;
-
- opinfo = kzalloc(sizeof(struct oplock_info), GFP_KERNEL);
- if (!opinfo)
- return NULL;
-
- opinfo->sess = sess;
- opinfo->conn = conn;
- opinfo->level = SMB2_OPLOCK_LEVEL_NONE;
- opinfo->op_state = OPLOCK_STATE_NONE;
- opinfo->pending_break = 0;
- opinfo->fid = id;
- opinfo->Tid = Tid;
- INIT_LIST_HEAD(&opinfo->op_entry);
- INIT_LIST_HEAD(&opinfo->interim_list);
- init_waitqueue_head(&opinfo->oplock_q);
- init_waitqueue_head(&opinfo->oplock_brk);
- atomic_set(&opinfo->refcount, 1);
- atomic_set(&opinfo->breaking_cnt, 0);
-
- return opinfo;
-}
-
-static void lease_add_list(struct oplock_info *opinfo)
-{
- struct lease_table *lb = opinfo->o_lease->l_lb;
-
- spin_lock(&lb->lb_lock);
- list_add_rcu(&opinfo->lease_entry, &lb->lease_list);
- spin_unlock(&lb->lb_lock);
-}
-
-static void lease_del_list(struct oplock_info *opinfo)
-{
- struct lease_table *lb = opinfo->o_lease->l_lb;
-
- if (!lb)
- return;
-
- spin_lock(&lb->lb_lock);
- if (list_empty(&opinfo->lease_entry)) {
- spin_unlock(&lb->lb_lock);
- return;
- }
-
- list_del_init(&opinfo->lease_entry);
- opinfo->o_lease->l_lb = NULL;
- spin_unlock(&lb->lb_lock);
-}
-
-static void lb_add(struct lease_table *lb)
-{
- write_lock(&lease_list_lock);
- list_add(&lb->l_entry, &lease_table_list);
- write_unlock(&lease_list_lock);
-}
-
-static int alloc_lease(struct oplock_info *opinfo, struct lease_ctx_info *lctx)
-{
- struct lease *lease;
-
- lease = kmalloc(sizeof(struct lease), GFP_KERNEL);
- if (!lease)
- return -ENOMEM;
-
- memcpy(lease->lease_key, lctx->lease_key, SMB2_LEASE_KEY_SIZE);
- lease->state = lctx->req_state;
- lease->new_state = 0;
- lease->flags = lctx->flags;
- lease->duration = lctx->duration;
- memcpy(lease->parent_lease_key, lctx->parent_lease_key, SMB2_LEASE_KEY_SIZE);
- lease->version = lctx->version;
- lease->epoch = 0;
- INIT_LIST_HEAD(&opinfo->lease_entry);
- opinfo->o_lease = lease;
-
- return 0;
-}
-
-static void free_lease(struct oplock_info *opinfo)
-{
- struct lease *lease;
-
- lease = opinfo->o_lease;
- kfree(lease);
-}
-
-static void free_opinfo(struct oplock_info *opinfo)
-{
- if (opinfo->is_lease)
- free_lease(opinfo);
- kfree(opinfo);
-}
-
-static inline void opinfo_free_rcu(struct rcu_head *rcu_head)
-{
- struct oplock_info *opinfo;
-
- opinfo = container_of(rcu_head, struct oplock_info, rcu_head);
- free_opinfo(opinfo);
-}
-
-struct oplock_info *opinfo_get(struct ksmbd_file *fp)
-{
- struct oplock_info *opinfo;
-
- rcu_read_lock();
- opinfo = rcu_dereference(fp->f_opinfo);
- if (opinfo && !atomic_inc_not_zero(&opinfo->refcount))
- opinfo = NULL;
- rcu_read_unlock();
-
- return opinfo;
-}
-
-static struct oplock_info *opinfo_get_list(struct ksmbd_inode *ci)
-{
- struct oplock_info *opinfo;
-
- if (list_empty(&ci->m_op_list))
- return NULL;
-
- rcu_read_lock();
- opinfo = list_first_or_null_rcu(&ci->m_op_list, struct oplock_info,
- op_entry);
- if (opinfo && !atomic_inc_not_zero(&opinfo->refcount))
- opinfo = NULL;
- rcu_read_unlock();
-
- return opinfo;
-}
-
-void opinfo_put(struct oplock_info *opinfo)
-{
- if (!atomic_dec_and_test(&opinfo->refcount))
- return;
-
- call_rcu(&opinfo->rcu_head, opinfo_free_rcu);
-}
-
-static void opinfo_add(struct oplock_info *opinfo)
-{
- struct ksmbd_inode *ci = opinfo->o_fp->f_ci;
-
- write_lock(&ci->m_lock);
- list_add_rcu(&opinfo->op_entry, &ci->m_op_list);
- write_unlock(&ci->m_lock);
-}
-
-static void opinfo_del(struct oplock_info *opinfo)
-{
- struct ksmbd_inode *ci = opinfo->o_fp->f_ci;
-
- if (opinfo->is_lease) {
- write_lock(&lease_list_lock);
- lease_del_list(opinfo);
- write_unlock(&lease_list_lock);
- }
- write_lock(&ci->m_lock);
- list_del_rcu(&opinfo->op_entry);
- write_unlock(&ci->m_lock);
-}
-
-static unsigned long opinfo_count(struct ksmbd_file *fp)
-{
- if (ksmbd_stream_fd(fp))
- return atomic_read(&fp->f_ci->sop_count);
- else
- return atomic_read(&fp->f_ci->op_count);
-}
-
-static void opinfo_count_inc(struct ksmbd_file *fp)
-{
- if (ksmbd_stream_fd(fp))
- return atomic_inc(&fp->f_ci->sop_count);
- else
- return atomic_inc(&fp->f_ci->op_count);
-}
-
-static void opinfo_count_dec(struct ksmbd_file *fp)
-{
- if (ksmbd_stream_fd(fp))
- return atomic_dec(&fp->f_ci->sop_count);
- else
- return atomic_dec(&fp->f_ci->op_count);
-}
-
-/**
- * opinfo_write_to_read() - convert a write oplock to read oplock
- * @opinfo: current oplock info
- *
- * Return: 0 on success, otherwise -EINVAL
- */
-int opinfo_write_to_read(struct oplock_info *opinfo)
-{
- struct lease *lease = opinfo->o_lease;
-
- if (!(opinfo->level == SMB2_OPLOCK_LEVEL_BATCH ||
- opinfo->level == SMB2_OPLOCK_LEVEL_EXCLUSIVE)) {
- pr_err("bad oplock(0x%x)\n", opinfo->level);
- if (opinfo->is_lease)
- pr_err("lease state(0x%x)\n", lease->state);
- return -EINVAL;
- }
- opinfo->level = SMB2_OPLOCK_LEVEL_II;
-
- if (opinfo->is_lease)
- lease->state = lease->new_state;
- return 0;
-}
-
-/**
- * opinfo_read_handle_to_read() - convert a read/handle oplock to read oplock
- * @opinfo: current oplock info
- *
- * Return: 0 on success, otherwise -EINVAL
- */
-int opinfo_read_handle_to_read(struct oplock_info *opinfo)
-{
- struct lease *lease = opinfo->o_lease;
-
- lease->state = lease->new_state;
- opinfo->level = SMB2_OPLOCK_LEVEL_II;
- return 0;
-}
-
-/**
- * opinfo_write_to_none() - convert a write oplock to none
- * @opinfo: current oplock info
- *
- * Return: 0 on success, otherwise -EINVAL
- */
-int opinfo_write_to_none(struct oplock_info *opinfo)
-{
- struct lease *lease = opinfo->o_lease;
-
- if (!(opinfo->level == SMB2_OPLOCK_LEVEL_BATCH ||
- opinfo->level == SMB2_OPLOCK_LEVEL_EXCLUSIVE)) {
- pr_err("bad oplock(0x%x)\n", opinfo->level);
- if (opinfo->is_lease)
- pr_err("lease state(0x%x)\n", lease->state);
- return -EINVAL;
- }
- opinfo->level = SMB2_OPLOCK_LEVEL_NONE;
- if (opinfo->is_lease)
- lease->state = lease->new_state;
- return 0;
-}
-
-/**
- * opinfo_read_to_none() - convert a write read to none
- * @opinfo: current oplock info
- *
- * Return: 0 on success, otherwise -EINVAL
- */
-int opinfo_read_to_none(struct oplock_info *opinfo)
-{
- struct lease *lease = opinfo->o_lease;
-
- if (opinfo->level != SMB2_OPLOCK_LEVEL_II) {
- pr_err("bad oplock(0x%x)\n", opinfo->level);
- if (opinfo->is_lease)
- pr_err("lease state(0x%x)\n", lease->state);
- return -EINVAL;
- }
- opinfo->level = SMB2_OPLOCK_LEVEL_NONE;
- if (opinfo->is_lease)
- lease->state = lease->new_state;
- return 0;
-}
-
-/**
- * lease_read_to_write() - upgrade lease state from read to write
- * @opinfo: current lease info
- *
- * Return: 0 on success, otherwise -EINVAL
- */
-int lease_read_to_write(struct oplock_info *opinfo)
-{
- struct lease *lease = opinfo->o_lease;
-
- if (!(lease->state & SMB2_LEASE_READ_CACHING_LE)) {
- ksmbd_debug(OPLOCK, "bad lease state(0x%x)\n", lease->state);
- return -EINVAL;
- }
-
- lease->new_state = SMB2_LEASE_NONE_LE;
- lease->state |= SMB2_LEASE_WRITE_CACHING_LE;
- if (lease->state & SMB2_LEASE_HANDLE_CACHING_LE)
- opinfo->level = SMB2_OPLOCK_LEVEL_BATCH;
- else
- opinfo->level = SMB2_OPLOCK_LEVEL_EXCLUSIVE;
- return 0;
-}
-
-/**
- * lease_none_upgrade() - upgrade lease state from none
- * @opinfo: current lease info
- * @new_state: new lease state
- *
- * Return: 0 on success, otherwise -EINVAL
- */
-static int lease_none_upgrade(struct oplock_info *opinfo, __le32 new_state)
-{
- struct lease *lease = opinfo->o_lease;
-
- if (!(lease->state == SMB2_LEASE_NONE_LE)) {
- ksmbd_debug(OPLOCK, "bad lease state(0x%x)\n", lease->state);
- return -EINVAL;
- }
-
- lease->new_state = SMB2_LEASE_NONE_LE;
- lease->state = new_state;
- if (lease->state & SMB2_LEASE_HANDLE_CACHING_LE)
- if (lease->state & SMB2_LEASE_WRITE_CACHING_LE)
- opinfo->level = SMB2_OPLOCK_LEVEL_BATCH;
- else
- opinfo->level = SMB2_OPLOCK_LEVEL_II;
- else if (lease->state & SMB2_LEASE_WRITE_CACHING_LE)
- opinfo->level = SMB2_OPLOCK_LEVEL_EXCLUSIVE;
- else if (lease->state & SMB2_LEASE_READ_CACHING_LE)
- opinfo->level = SMB2_OPLOCK_LEVEL_II;
-
- return 0;
-}
-
-/**
- * close_id_del_oplock() - release oplock object at file close time
- * @fp: ksmbd file pointer
- */
-void close_id_del_oplock(struct ksmbd_file *fp)
-{
- struct oplock_info *opinfo;
-
- if (S_ISDIR(file_inode(fp->filp)->i_mode))
- return;
-
- opinfo = opinfo_get(fp);
- if (!opinfo)
- return;
-
- opinfo_del(opinfo);
-
- rcu_assign_pointer(fp->f_opinfo, NULL);
- if (opinfo->op_state == OPLOCK_ACK_WAIT) {
- opinfo->op_state = OPLOCK_CLOSING;
- wake_up_interruptible_all(&opinfo->oplock_q);
- if (opinfo->is_lease) {
- atomic_set(&opinfo->breaking_cnt, 0);
- wake_up_interruptible_all(&opinfo->oplock_brk);
- }
- }
-
- opinfo_count_dec(fp);
- atomic_dec(&opinfo->refcount);
- opinfo_put(opinfo);
-}
-
-/**
- * grant_write_oplock() - grant exclusive/batch oplock or write lease
- * @opinfo_new: new oplock info object
- * @req_oplock: request oplock
- * @lctx: lease context information
- *
- * Return: 0
- */
-static void grant_write_oplock(struct oplock_info *opinfo_new, int req_oplock,
- struct lease_ctx_info *lctx)
-{
- struct lease *lease = opinfo_new->o_lease;
-
- if (req_oplock == SMB2_OPLOCK_LEVEL_BATCH)
- opinfo_new->level = SMB2_OPLOCK_LEVEL_BATCH;
- else
- opinfo_new->level = SMB2_OPLOCK_LEVEL_EXCLUSIVE;
-
- if (lctx) {
- lease->state = lctx->req_state;
- memcpy(lease->lease_key, lctx->lease_key, SMB2_LEASE_KEY_SIZE);
- }
-}
-
-/**
- * grant_read_oplock() - grant level2 oplock or read lease
- * @opinfo_new: new oplock info object
- * @lctx: lease context information
- *
- * Return: 0
- */
-static void grant_read_oplock(struct oplock_info *opinfo_new,
- struct lease_ctx_info *lctx)
-{
- struct lease *lease = opinfo_new->o_lease;
-
- opinfo_new->level = SMB2_OPLOCK_LEVEL_II;
-
- if (lctx) {
- lease->state = SMB2_LEASE_READ_CACHING_LE;
- if (lctx->req_state & SMB2_LEASE_HANDLE_CACHING_LE)
- lease->state |= SMB2_LEASE_HANDLE_CACHING_LE;
- memcpy(lease->lease_key, lctx->lease_key, SMB2_LEASE_KEY_SIZE);
- }
-}
-
-/**
- * grant_none_oplock() - grant none oplock or none lease
- * @opinfo_new: new oplock info object
- * @lctx: lease context information
- *
- * Return: 0
- */
-static void grant_none_oplock(struct oplock_info *opinfo_new,
- struct lease_ctx_info *lctx)
-{
- struct lease *lease = opinfo_new->o_lease;
-
- opinfo_new->level = SMB2_OPLOCK_LEVEL_NONE;
-
- if (lctx) {
- lease->state = 0;
- memcpy(lease->lease_key, lctx->lease_key, SMB2_LEASE_KEY_SIZE);
- }
-}
-
-static inline int compare_guid_key(struct oplock_info *opinfo,
- const char *guid1, const char *key1)
-{
- const char *guid2, *key2;
-
- guid2 = opinfo->conn->ClientGUID;
- key2 = opinfo->o_lease->lease_key;
- if (!memcmp(guid1, guid2, SMB2_CLIENT_GUID_SIZE) &&
- !memcmp(key1, key2, SMB2_LEASE_KEY_SIZE))
- return 1;
-
- return 0;
-}
-
-/**
- * same_client_has_lease() - check whether current lease request is
- * from lease owner of file
- * @ci: master file pointer
- * @client_guid: Client GUID
- * @lctx: lease context information
- *
- * Return: oplock(lease) object on success, otherwise NULL
- */
-static struct oplock_info *same_client_has_lease(struct ksmbd_inode *ci,
- char *client_guid,
- struct lease_ctx_info *lctx)
-{
- int ret;
- struct lease *lease;
- struct oplock_info *opinfo;
- struct oplock_info *m_opinfo = NULL;
-
- if (!lctx)
- return NULL;
-
- /*
- * Compare lease key and client_guid to know request from same owner
- * of same client
- */
- read_lock(&ci->m_lock);
- list_for_each_entry(opinfo, &ci->m_op_list, op_entry) {
- if (!opinfo->is_lease)
- continue;
- read_unlock(&ci->m_lock);
- lease = opinfo->o_lease;
-
- ret = compare_guid_key(opinfo, client_guid, lctx->lease_key);
- if (ret) {
- m_opinfo = opinfo;
- /* skip upgrading lease about breaking lease */
- if (atomic_read(&opinfo->breaking_cnt)) {
- read_lock(&ci->m_lock);
- continue;
- }
-
- /* upgrading lease */
- if ((atomic_read(&ci->op_count) +
- atomic_read(&ci->sop_count)) == 1) {
- if (lease->state ==
- (lctx->req_state & lease->state)) {
- lease->state |= lctx->req_state;
- if (lctx->req_state &
- SMB2_LEASE_WRITE_CACHING_LE)
- lease_read_to_write(opinfo);
- }
- } else if ((atomic_read(&ci->op_count) +
- atomic_read(&ci->sop_count)) > 1) {
- if (lctx->req_state ==
- (SMB2_LEASE_READ_CACHING_LE |
- SMB2_LEASE_HANDLE_CACHING_LE))
- lease->state = lctx->req_state;
- }
-
- if (lctx->req_state && lease->state ==
- SMB2_LEASE_NONE_LE)
- lease_none_upgrade(opinfo, lctx->req_state);
- }
- read_lock(&ci->m_lock);
- }
- read_unlock(&ci->m_lock);
-
- return m_opinfo;
-}
-
-static void wait_for_break_ack(struct oplock_info *opinfo)
-{
- int rc = 0;
-
- rc = wait_event_interruptible_timeout(opinfo->oplock_q,
- opinfo->op_state == OPLOCK_STATE_NONE ||
- opinfo->op_state == OPLOCK_CLOSING,
- OPLOCK_WAIT_TIME);
-
- /* is this a timeout ? */
- if (!rc) {
- if (opinfo->is_lease)
- opinfo->o_lease->state = SMB2_LEASE_NONE_LE;
- opinfo->level = SMB2_OPLOCK_LEVEL_NONE;
- opinfo->op_state = OPLOCK_STATE_NONE;
- }
-}
-
-static void wake_up_oplock_break(struct oplock_info *opinfo)
-{
- clear_bit_unlock(0, &opinfo->pending_break);
- /* memory barrier is needed for wake_up_bit() */
- smp_mb__after_atomic();
- wake_up_bit(&opinfo->pending_break, 0);
-}
-
-static int oplock_break_pending(struct oplock_info *opinfo, int req_op_level)
-{
- while (test_and_set_bit(0, &opinfo->pending_break)) {
- wait_on_bit(&opinfo->pending_break, 0, TASK_UNINTERRUPTIBLE);
-
- /* Not immediately break to none. */
- opinfo->open_trunc = 0;
-
- if (opinfo->op_state == OPLOCK_CLOSING)
- return -ENOENT;
- else if (!opinfo->is_lease && opinfo->level <= req_op_level)
- return 1;
- }
-
- if (!opinfo->is_lease && opinfo->level <= req_op_level) {
- wake_up_oplock_break(opinfo);
- return 1;
- }
- return 0;
-}
-
-static inline int allocate_oplock_break_buf(struct ksmbd_work *work)
-{
- work->response_buf = kzalloc(MAX_CIFS_SMALL_BUFFER_SIZE, GFP_KERNEL);
- if (!work->response_buf)
- return -ENOMEM;
- work->response_sz = MAX_CIFS_SMALL_BUFFER_SIZE;
- return 0;
-}
-
-/**
- * __smb2_oplock_break_noti() - send smb2 oplock break cmd from conn
- * to client
- * @wk: smb work object
- *
- * There are two ways this function can be called. 1- while file open we break
- * from exclusive/batch lock to levelII oplock and 2- while file write/truncate
- * we break from levelII oplock no oplock.
- * work->request_buf contains oplock_info.
- */
-static void __smb2_oplock_break_noti(struct work_struct *wk)
-{
- struct smb2_oplock_break *rsp = NULL;
- struct ksmbd_work *work = container_of(wk, struct ksmbd_work, work);
- struct ksmbd_conn *conn = work->conn;
- struct oplock_break_info *br_info = work->request_buf;
- struct smb2_hdr *rsp_hdr;
- struct ksmbd_file *fp;
-
- fp = ksmbd_lookup_durable_fd(br_info->fid);
- if (!fp)
- 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
- * @tag_len: the length of tag
- *
- * 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, int tag_len)
-{
- 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 (name_len == tag_len && !memcmp(name, tag, name_len))
- 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, &lt->lease_list, lease_entry) {
- if (!atomic_inc_not_zero(&opinfo->refcount))
- continue;
- rcu_read_unlock();
- if (!opinfo->op_state || opinfo->op_state == OPLOCK_CLOSING)
- goto op_next;
- if (!(opinfo->o_lease->state &
- (SMB2_LEASE_HANDLE_CACHING_LE |
- SMB2_LEASE_WRITE_CACHING_LE)))
- goto op_next;
- ret = compare_guid_key(opinfo, conn->ClientGUID,
- lease_key);
- if (ret) {
- ksmbd_debug(OPLOCK, "found opinfo\n");
- ret_op = opinfo;
- goto out;
- }
-op_next:
- opinfo_put(opinfo);
- rcu_read_lock();
- }
- rcu_read_unlock();
-
-out:
- read_unlock(&lease_list_lock);
- return ret_op;
-}