6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Namjae Jeon linkinjeon@kernel.org
[ Upstream commit c8efcc786146a951091588e5fa7e3c754850cb3c ]
Durable file handles allow reopening a file preserved on a short network outage and transparent client reconnection within a timeout. i.e. Durable handles aren't necessarily cleaned up when the opening process terminates.
This patch add support for durable handle version 1 and 2.
To prove durable handles work on ksmbd, I have tested this patch with the following smbtorture tests:
smb2.durable-open.open-oplock smb2.durable-open.open-lease smb2.durable-open.reopen1 smb2.durable-open.reopen1a smb2.durable-open.reopen1a-lease smb2.durable-open.reopen2 smb2.durable-open.reopen2a smb2.durable-open.reopen2-lease smb2.durable-open.reopen2-lease-v2 smb2.durable-open.reopen3 smb2.durable-open.reopen4 smb2.durable-open.delete_on_close2 smb2.durable-open.file-position smb2.durable-open.lease smb2.durable-open.alloc-size smb2.durable-open.read-only smb2.durable-v2-open.create-blob smb2.durable-v2-open.open-oplock smb2.durable-v2-open.open-lease smb2.durable-v2-open.reopen1 smb2.durable-v2-open.reopen1a smb2.durable-v2-open.reopen1a-lease smb2.durable-v2-open.reopen2 smb2.durable-v2-open.reopen2b
Signed-off-by: Namjae Jeon linkinjeon@kernel.org Signed-off-by: Steve French stfrench@microsoft.com Signed-off-by: Sasha Levin sashal@kernel.org --- fs/smb/server/ksmbd_netlink.h | 1 + fs/smb/server/mgmt/user_session.c | 1 + fs/smb/server/oplock.c | 94 +++++++++-- fs/smb/server/oplock.h | 7 +- fs/smb/server/smb2ops.c | 6 + fs/smb/server/smb2pdu.c | 257 +++++++++++++++++++++++++++++- fs/smb/server/smb2pdu.h | 15 ++ fs/smb/server/vfs_cache.c | 137 +++++++++++++++- fs/smb/server/vfs_cache.h | 9 ++ 9 files changed, 506 insertions(+), 21 deletions(-)
diff --git a/fs/smb/server/ksmbd_netlink.h b/fs/smb/server/ksmbd_netlink.h index 4464a62228cf3..686b321c5a8bb 100644 --- a/fs/smb/server/ksmbd_netlink.h +++ b/fs/smb/server/ksmbd_netlink.h @@ -75,6 +75,7 @@ struct ksmbd_heartbeat { #define KSMBD_GLOBAL_FLAG_SMB2_ENCRYPTION BIT(1) #define KSMBD_GLOBAL_FLAG_SMB3_MULTICHANNEL BIT(2) #define KSMBD_GLOBAL_FLAG_SMB2_ENCRYPTION_OFF BIT(3) +#define KSMBD_GLOBAL_FLAG_DURABLE_HANDLE BIT(4)
/* * IPC request for ksmbd server startup diff --git a/fs/smb/server/mgmt/user_session.c b/fs/smb/server/mgmt/user_session.c index 83074672fe812..aec0a7a124052 100644 --- a/fs/smb/server/mgmt/user_session.c +++ b/fs/smb/server/mgmt/user_session.c @@ -324,6 +324,7 @@ void destroy_previous_session(struct ksmbd_conn *conn, memcmp(user->passkey, prev_user->passkey, user->passkey_sz)) goto out;
+ ksmbd_destroy_file_table(&prev_sess->file_table); prev_sess->state = SMB2_SESSION_EXPIRED; out: up_write(&conn->session_lock); diff --git a/fs/smb/server/oplock.c b/fs/smb/server/oplock.c index dc729ab980dc0..7bdae2adad228 100644 --- a/fs/smb/server/oplock.c +++ b/fs/smb/server/oplock.c @@ -159,7 +159,8 @@ static struct oplock_info *opinfo_get_list(struct ksmbd_inode *ci) opinfo = list_first_or_null_rcu(&ci->m_op_list, struct oplock_info, op_entry); if (opinfo) { - if (!atomic_inc_not_zero(&opinfo->refcount)) + if (opinfo->conn == NULL || + !atomic_inc_not_zero(&opinfo->refcount)) opinfo = NULL; else { atomic_inc(&opinfo->conn->r_count); @@ -527,7 +528,7 @@ static struct oplock_info *same_client_has_lease(struct ksmbd_inode *ci, */ read_lock(&ci->m_lock); list_for_each_entry(opinfo, &ci->m_op_list, op_entry) { - if (!opinfo->is_lease) + if (!opinfo->is_lease || !opinfo->conn) continue; read_unlock(&ci->m_lock); lease = opinfo->o_lease; @@ -651,7 +652,7 @@ static void __smb2_oplock_break_noti(struct work_struct *wk) struct smb2_hdr *rsp_hdr; struct ksmbd_file *fp;
- fp = ksmbd_lookup_durable_fd(br_info->fid); + fp = ksmbd_lookup_global_fd(br_info->fid); if (!fp) goto out;
@@ -1115,7 +1116,7 @@ void smb_send_parent_lease_break_noti(struct ksmbd_file *fp,
read_lock(&p_ci->m_lock); list_for_each_entry(opinfo, &p_ci->m_op_list, op_entry) { - if (!opinfo->is_lease) + if (opinfo->conn == NULL || !opinfo->is_lease) continue;
if (opinfo->o_lease->state != SMB2_OPLOCK_LEVEL_NONE && @@ -1160,7 +1161,7 @@ void smb_lazy_parent_lease_break_close(struct ksmbd_file *fp)
read_lock(&p_ci->m_lock); list_for_each_entry(opinfo, &p_ci->m_op_list, op_entry) { - if (!opinfo->is_lease) + if (opinfo->conn == NULL || !opinfo->is_lease) continue;
if (opinfo->o_lease->state != SMB2_OPLOCK_LEVEL_NONE) { @@ -1372,6 +1373,9 @@ void smb_break_all_levII_oplock(struct ksmbd_work *work, struct ksmbd_file *fp,
rcu_read_lock(); list_for_each_entry_rcu(brk_op, &ci->m_op_list, op_entry) { + if (brk_op->conn == NULL) + continue; + if (!atomic_inc_not_zero(&brk_op->refcount)) continue;
@@ -1508,11 +1512,10 @@ void create_lease_buf(u8 *rbuf, struct lease *lease) /** * parse_lease_state() - parse lease context containted in file open request * @open_req: buffer containing smb2 file open(create) request - * @is_dir: whether leasing file is directory * * Return: oplock state, -ENOENT if create lease context not found */ -struct lease_ctx_info *parse_lease_state(void *open_req, bool is_dir) +struct lease_ctx_info *parse_lease_state(void *open_req) { struct create_context *cc; struct smb2_create_req *req = (struct smb2_create_req *)open_req; @@ -1530,12 +1533,7 @@ struct lease_ctx_info *parse_lease_state(void *open_req, bool is_dir) struct create_lease_v2 *lc = (struct create_lease_v2 *)cc;
memcpy(lreq->lease_key, lc->lcontext.LeaseKey, SMB2_LEASE_KEY_SIZE); - if (is_dir) { - lreq->req_state = lc->lcontext.LeaseState & - ~SMB2_LEASE_WRITE_CACHING_LE; - lreq->is_dir = true; - } else - lreq->req_state = lc->lcontext.LeaseState; + lreq->req_state = lc->lcontext.LeaseState; lreq->flags = lc->lcontext.LeaseFlags; lreq->epoch = lc->lcontext.Epoch; lreq->duration = lc->lcontext.LeaseDuration; @@ -1659,6 +1657,8 @@ void create_durable_v2_rsp_buf(char *cc, struct ksmbd_file *fp) buf->Name[3] = 'Q';
buf->Timeout = cpu_to_le32(fp->durable_timeout); + if (fp->is_persistent) + buf->Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT); }
/** @@ -1826,3 +1826,71 @@ struct oplock_info *lookup_lease_in_table(struct ksmbd_conn *conn, read_unlock(&lease_list_lock); return ret_op; } + +int smb2_check_durable_oplock(struct ksmbd_conn *conn, + struct ksmbd_share_config *share, + struct ksmbd_file *fp, + struct lease_ctx_info *lctx, + char *name) +{ + struct oplock_info *opinfo = opinfo_get(fp); + int ret = 0; + + if (!opinfo) + return 0; + + if (opinfo->is_lease == false) { + if (lctx) { + pr_err("create context include lease\n"); + ret = -EBADF; + goto out; + } + + if (opinfo->level != SMB2_OPLOCK_LEVEL_BATCH) { + pr_err("oplock level is not equal to SMB2_OPLOCK_LEVEL_BATCH\n"); + ret = -EBADF; + } + + goto out; + } + + if (memcmp(conn->ClientGUID, fp->client_guid, + SMB2_CLIENT_GUID_SIZE)) { + ksmbd_debug(SMB, "Client guid of fp is not equal to the one of connction\n"); + ret = -EBADF; + goto out; + } + + if (!lctx) { + ksmbd_debug(SMB, "create context does not include lease\n"); + ret = -EBADF; + goto out; + } + + if (memcmp(opinfo->o_lease->lease_key, lctx->lease_key, + SMB2_LEASE_KEY_SIZE)) { + ksmbd_debug(SMB, + "lease key of fp does not match lease key in create context\n"); + ret = -EBADF; + goto out; + } + + if (!(opinfo->o_lease->state & SMB2_LEASE_HANDLE_CACHING_LE)) { + ksmbd_debug(SMB, "lease state does not contain SMB2_LEASE_HANDLE_CACHING\n"); + ret = -EBADF; + goto out; + } + + if (opinfo->o_lease->version != lctx->version) { + ksmbd_debug(SMB, + "lease version of fp does not match the one in create context\n"); + ret = -EBADF; + goto out; + } + + if (!ksmbd_inode_pending_delete(fp)) + ret = ksmbd_validate_name_reconnect(share, fp, name); +out: + opinfo_put(opinfo); + return ret; +} diff --git a/fs/smb/server/oplock.h b/fs/smb/server/oplock.h index 5b93ea9196c01..e9da63f25b206 100644 --- a/fs/smb/server/oplock.h +++ b/fs/smb/server/oplock.h @@ -111,7 +111,7 @@ void opinfo_put(struct oplock_info *opinfo);
/* Lease related functions */ void create_lease_buf(u8 *rbuf, struct lease *lease); -struct lease_ctx_info *parse_lease_state(void *open_req, bool is_dir); +struct lease_ctx_info *parse_lease_state(void *open_req); __u8 smb2_map_lease_to_oplock(__le32 lease_state); int lease_read_to_write(struct oplock_info *opinfo);
@@ -130,4 +130,9 @@ void destroy_lease_table(struct ksmbd_conn *conn); void smb_send_parent_lease_break_noti(struct ksmbd_file *fp, struct lease_ctx_info *lctx); void smb_lazy_parent_lease_break_close(struct ksmbd_file *fp); +int smb2_check_durable_oplock(struct ksmbd_conn *conn, + struct ksmbd_share_config *share, + struct ksmbd_file *fp, + struct lease_ctx_info *lctx, + char *name); #endif /* __KSMBD_OPLOCK_H */ diff --git a/fs/smb/server/smb2ops.c b/fs/smb/server/smb2ops.c index 8600f32c981a1..606aa3c5189a2 100644 --- a/fs/smb/server/smb2ops.c +++ b/fs/smb/server/smb2ops.c @@ -261,6 +261,9 @@ void init_smb3_02_server(struct ksmbd_conn *conn)
if (server_conf.flags & KSMBD_GLOBAL_FLAG_SMB3_MULTICHANNEL) conn->vals->capabilities |= SMB2_GLOBAL_CAP_MULTI_CHANNEL; + + if (server_conf.flags & KSMBD_GLOBAL_FLAG_DURABLE_HANDLE) + conn->vals->capabilities |= SMB2_GLOBAL_CAP_PERSISTENT_HANDLES; }
/** @@ -283,6 +286,9 @@ int init_smb3_11_server(struct ksmbd_conn *conn) if (server_conf.flags & KSMBD_GLOBAL_FLAG_SMB3_MULTICHANNEL) conn->vals->capabilities |= SMB2_GLOBAL_CAP_MULTI_CHANNEL;
+ if (server_conf.flags & KSMBD_GLOBAL_FLAG_DURABLE_HANDLE) + conn->vals->capabilities |= SMB2_GLOBAL_CAP_PERSISTENT_HANDLES; + INIT_LIST_HEAD(&conn->preauth_sess_table); return 0; } diff --git a/fs/smb/server/smb2pdu.c b/fs/smb/server/smb2pdu.c index 61717917db765..218adb3c55816 100644 --- a/fs/smb/server/smb2pdu.c +++ b/fs/smb/server/smb2pdu.c @@ -2622,6 +2622,165 @@ static void ksmbd_acls_fattr(struct smb_fattr *fattr, } }
+enum { + DURABLE_RECONN_V2 = 1, + DURABLE_RECONN, + DURABLE_REQ_V2, + DURABLE_REQ, +}; + +struct durable_info { + struct ksmbd_file *fp; + unsigned short int type; + bool persistent; + bool reconnected; + unsigned int timeout; + char *CreateGuid; +}; + +static int parse_durable_handle_context(struct ksmbd_work *work, + struct smb2_create_req *req, + struct lease_ctx_info *lc, + struct durable_info *dh_info) +{ + struct ksmbd_conn *conn = work->conn; + struct create_context *context; + int dh_idx, err = 0; + u64 persistent_id = 0; + int req_op_level; + static const char * const durable_arr[] = {"DH2C", "DHnC", "DH2Q", "DHnQ"}; + + req_op_level = req->RequestedOplockLevel; + for (dh_idx = DURABLE_RECONN_V2; dh_idx <= ARRAY_SIZE(durable_arr); + dh_idx++) { + context = smb2_find_context_vals(req, durable_arr[dh_idx - 1], 4); + if (IS_ERR(context)) { + err = PTR_ERR(context); + goto out; + } + if (!context) + continue; + + switch (dh_idx) { + case DURABLE_RECONN_V2: + { + struct create_durable_reconn_v2_req *recon_v2; + + if (dh_info->type == DURABLE_RECONN || + dh_info->type == DURABLE_REQ_V2) { + err = -EINVAL; + goto out; + } + + recon_v2 = (struct create_durable_reconn_v2_req *)context; + persistent_id = recon_v2->Fid.PersistentFileId; + dh_info->fp = ksmbd_lookup_durable_fd(persistent_id); + if (!dh_info->fp) { + ksmbd_debug(SMB, "Failed to get durable handle state\n"); + err = -EBADF; + goto out; + } + + if (memcmp(dh_info->fp->create_guid, recon_v2->CreateGuid, + SMB2_CREATE_GUID_SIZE)) { + err = -EBADF; + ksmbd_put_durable_fd(dh_info->fp); + goto out; + } + + dh_info->type = dh_idx; + dh_info->reconnected = true; + ksmbd_debug(SMB, + "reconnect v2 Persistent-id from reconnect = %llu\n", + persistent_id); + break; + } + case DURABLE_RECONN: + { + struct create_durable_reconn_req *recon; + + if (dh_info->type == DURABLE_RECONN_V2 || + dh_info->type == DURABLE_REQ_V2) { + err = -EINVAL; + goto out; + } + + recon = (struct create_durable_reconn_req *)context; + persistent_id = recon->Data.Fid.PersistentFileId; + dh_info->fp = ksmbd_lookup_durable_fd(persistent_id); + if (!dh_info->fp) { + ksmbd_debug(SMB, "Failed to get durable handle state\n"); + err = -EBADF; + goto out; + } + + dh_info->type = dh_idx; + dh_info->reconnected = true; + ksmbd_debug(SMB, "reconnect Persistent-id from reconnect = %llu\n", + persistent_id); + break; + } + case DURABLE_REQ_V2: + { + struct create_durable_req_v2 *durable_v2_blob; + + if (dh_info->type == DURABLE_RECONN || + dh_info->type == DURABLE_RECONN_V2) { + err = -EINVAL; + goto out; + } + + durable_v2_blob = + (struct create_durable_req_v2 *)context; + ksmbd_debug(SMB, "Request for durable v2 open\n"); + dh_info->fp = ksmbd_lookup_fd_cguid(durable_v2_blob->CreateGuid); + if (dh_info->fp) { + if (!memcmp(conn->ClientGUID, dh_info->fp->client_guid, + SMB2_CLIENT_GUID_SIZE)) { + if (!(req->hdr.Flags & SMB2_FLAGS_REPLAY_OPERATION)) { + err = -ENOEXEC; + goto out; + } + + dh_info->fp->conn = conn; + dh_info->reconnected = true; + goto out; + } + } + + if (((lc && (lc->req_state & SMB2_LEASE_HANDLE_CACHING_LE)) || + req_op_level == SMB2_OPLOCK_LEVEL_BATCH)) { + dh_info->CreateGuid = + durable_v2_blob->CreateGuid; + dh_info->persistent = + le32_to_cpu(durable_v2_blob->Flags); + dh_info->timeout = + le32_to_cpu(durable_v2_blob->Timeout); + dh_info->type = dh_idx; + } + break; + } + case DURABLE_REQ: + if (dh_info->type == DURABLE_RECONN) + goto out; + if (dh_info->type == DURABLE_RECONN_V2 || + dh_info->type == DURABLE_REQ_V2) { + err = -EINVAL; + goto out; + } + + if (((lc && (lc->req_state & SMB2_LEASE_HANDLE_CACHING_LE)) || + req_op_level == SMB2_OPLOCK_LEVEL_BATCH)) { + ksmbd_debug(SMB, "Request for durable open\n"); + dh_info->type = dh_idx; + } + } + } + +out: + return err; +} + /** * smb2_open() - handler for smb file open request * @work: smb work containing request buffer @@ -2645,6 +2804,7 @@ int smb2_open(struct ksmbd_work *work) struct lease_ctx_info *lc = NULL; struct create_ea_buf_req *ea_buf = NULL; struct oplock_info *opinfo; + struct durable_info dh_info = {0}; __le32 *next_ptr = NULL; int req_op_level = 0, open_flags = 0, may_flags = 0, file_info = 0; int rc = 0; @@ -2725,6 +2885,49 @@ int smb2_open(struct ksmbd_work *work) } }
+ req_op_level = req->RequestedOplockLevel; + + if (server_conf.flags & KSMBD_GLOBAL_FLAG_DURABLE_HANDLE && + req->CreateContextsOffset) { + lc = parse_lease_state(req); + rc = parse_durable_handle_context(work, req, lc, &dh_info); + if (rc) { + ksmbd_debug(SMB, "error parsing durable handle context\n"); + goto err_out2; + } + + if (dh_info.reconnected == true) { + rc = smb2_check_durable_oplock(conn, share, dh_info.fp, lc, name); + if (rc) { + ksmbd_put_durable_fd(dh_info.fp); + goto err_out2; + } + + rc = ksmbd_reopen_durable_fd(work, dh_info.fp); + if (rc) { + ksmbd_put_durable_fd(dh_info.fp); + goto err_out2; + } + + if (ksmbd_override_fsids(work)) { + rc = -ENOMEM; + ksmbd_put_durable_fd(dh_info.fp); + goto err_out2; + } + + fp = dh_info.fp; + file_info = FILE_OPENED; + + rc = ksmbd_vfs_getattr(&fp->filp->f_path, &stat); + if (rc) + goto err_out2; + + ksmbd_put_durable_fd(fp); + goto reconnected_fp; + } + } else if (req_op_level == SMB2_OPLOCK_LEVEL_LEASE) + lc = parse_lease_state(req); + if (le32_to_cpu(req->ImpersonationLevel) > le32_to_cpu(IL_DELEGATE)) { pr_err("Invalid impersonationlevel : 0x%x\n", le32_to_cpu(req->ImpersonationLevel)); @@ -3187,10 +3390,6 @@ int smb2_open(struct ksmbd_work *work) need_truncate = 1; }
- req_op_level = req->RequestedOplockLevel; - if (req_op_level == SMB2_OPLOCK_LEVEL_LEASE) - lc = parse_lease_state(req, S_ISDIR(file_inode(filp)->i_mode)); - share_ret = ksmbd_smb_check_shared_mode(fp->filp, fp); if (!test_share_config_flag(work->tcon->share_conf, KSMBD_SHARE_FLAG_OPLOCKS) || (req_op_level == SMB2_OPLOCK_LEVEL_LEASE && @@ -3201,6 +3400,11 @@ int smb2_open(struct ksmbd_work *work) } } else { if (req_op_level == SMB2_OPLOCK_LEVEL_LEASE) { + if (S_ISDIR(file_inode(filp)->i_mode)) { + lc->req_state &= ~SMB2_LEASE_WRITE_CACHING_LE; + lc->is_dir = true; + } + /* * Compare parent lease using parent key. If there is no * a lease that has same parent key, Send lease break @@ -3297,6 +3501,24 @@ int smb2_open(struct ksmbd_work *work)
memcpy(fp->client_guid, conn->ClientGUID, SMB2_CLIENT_GUID_SIZE);
+ if (dh_info.type == DURABLE_REQ_V2 || dh_info.type == DURABLE_REQ) { + if (dh_info.type == DURABLE_REQ_V2 && dh_info.persistent) + fp->is_persistent = true; + else + fp->is_durable = true; + + if (dh_info.type == DURABLE_REQ_V2) { + memcpy(fp->create_guid, dh_info.CreateGuid, + SMB2_CREATE_GUID_SIZE); + if (dh_info.timeout) + fp->durable_timeout = min(dh_info.timeout, + 300000); + else + fp->durable_timeout = 60; + } + } + +reconnected_fp: rsp->StructureSize = cpu_to_le16(89); rcu_read_lock(); opinfo = rcu_dereference(fp->f_opinfo); @@ -3383,6 +3605,33 @@ int smb2_open(struct ksmbd_work *work) next_off = conn->vals->create_disk_id_size; }
+ if (dh_info.type == DURABLE_REQ || dh_info.type == DURABLE_REQ_V2) { + struct create_context *durable_ccontext; + + durable_ccontext = (struct create_context *)(rsp->Buffer + + le32_to_cpu(rsp->CreateContextsLength)); + contxt_cnt++; + if (dh_info.type == DURABLE_REQ) { + create_durable_rsp_buf(rsp->Buffer + + le32_to_cpu(rsp->CreateContextsLength)); + le32_add_cpu(&rsp->CreateContextsLength, + conn->vals->create_durable_size); + iov_len += conn->vals->create_durable_size; + } else { + create_durable_v2_rsp_buf(rsp->Buffer + + le32_to_cpu(rsp->CreateContextsLength), + fp); + le32_add_cpu(&rsp->CreateContextsLength, + conn->vals->create_durable_v2_size); + iov_len += conn->vals->create_durable_v2_size; + } + + if (next_ptr) + *next_ptr = cpu_to_le32(next_off); + next_ptr = &durable_ccontext->Next; + next_off = conn->vals->create_durable_size; + } + if (posix_ctxt) { contxt_cnt++; create_posix_rsp_buf(rsp->Buffer + diff --git a/fs/smb/server/smb2pdu.h b/fs/smb/server/smb2pdu.h index d12cfd3b09278..bd1d2a0e9203a 100644 --- a/fs/smb/server/smb2pdu.h +++ b/fs/smb/server/smb2pdu.h @@ -72,6 +72,18 @@ struct create_durable_req_v2 { __u8 CreateGuid[16]; } __packed;
+struct create_durable_reconn_req { + struct create_context ccontext; + __u8 Name[8]; + union { + __u8 Reserved[16]; + struct { + __u64 PersistentFileId; + __u64 VolatileFileId; + } Fid; + } Data; +} __packed; + struct create_durable_reconn_v2_req { struct create_context ccontext; __u8 Name[8]; @@ -98,6 +110,9 @@ struct create_durable_rsp { } Data; } __packed;
+/* See MS-SMB2 2.2.13.2.11 */ +/* Flags */ +#define SMB2_DHANDLE_FLAG_PERSISTENT 0x00000002 struct create_durable_v2_rsp { struct create_context ccontext; __u8 Name[8]; diff --git a/fs/smb/server/vfs_cache.c b/fs/smb/server/vfs_cache.c index 4e82ff627d122..030f70700036c 100644 --- a/fs/smb/server/vfs_cache.c +++ b/fs/smb/server/vfs_cache.c @@ -305,7 +305,8 @@ static void __ksmbd_close_fd(struct ksmbd_file_table *ft, struct ksmbd_file *fp)
fd_limit_close(); __ksmbd_remove_durable_fd(fp); - __ksmbd_remove_fd(ft, fp); + if (ft) + __ksmbd_remove_fd(ft, fp);
close_id_del_oplock(fp); filp = fp->filp; @@ -465,11 +466,32 @@ struct ksmbd_file *ksmbd_lookup_fd_slow(struct ksmbd_work *work, u64 id, return fp; }
-struct ksmbd_file *ksmbd_lookup_durable_fd(unsigned long long id) +struct ksmbd_file *ksmbd_lookup_global_fd(unsigned long long id) { return __ksmbd_lookup_fd(&global_ft, id); }
+struct ksmbd_file *ksmbd_lookup_durable_fd(unsigned long long id) +{ + struct ksmbd_file *fp; + + fp = __ksmbd_lookup_fd(&global_ft, id); + if (fp && fp->conn) { + ksmbd_put_durable_fd(fp); + fp = NULL; + } + + return fp; +} + +void ksmbd_put_durable_fd(struct ksmbd_file *fp) +{ + if (!atomic_dec_and_test(&fp->refcount)) + return; + + __ksmbd_close_fd(NULL, fp); +} + struct ksmbd_file *ksmbd_lookup_fd_cguid(char *cguid) { struct ksmbd_file *fp = NULL; @@ -639,6 +661,32 @@ __close_file_table_ids(struct ksmbd_file_table *ft, return num; }
+static inline bool is_reconnectable(struct ksmbd_file *fp) +{ + struct oplock_info *opinfo = opinfo_get(fp); + bool reconn = false; + + if (!opinfo) + return false; + + if (opinfo->op_state != OPLOCK_STATE_NONE) { + opinfo_put(opinfo); + return false; + } + + if (fp->is_resilient || fp->is_persistent) + reconn = true; + else if (fp->is_durable && opinfo->is_lease && + opinfo->o_lease->state & SMB2_LEASE_HANDLE_CACHING_LE) + reconn = true; + + else if (fp->is_durable && opinfo->level == SMB2_OPLOCK_LEVEL_BATCH) + reconn = true; + + opinfo_put(opinfo); + return reconn; +} + static bool tree_conn_fd_check(struct ksmbd_tree_connect *tcon, struct ksmbd_file *fp) { @@ -648,7 +696,28 @@ static bool tree_conn_fd_check(struct ksmbd_tree_connect *tcon, static bool session_fd_check(struct ksmbd_tree_connect *tcon, struct ksmbd_file *fp) { - return false; + struct ksmbd_inode *ci; + struct oplock_info *op; + struct ksmbd_conn *conn; + + if (!is_reconnectable(fp)) + return false; + + conn = fp->conn; + ci = fp->f_ci; + write_lock(&ci->m_lock); + list_for_each_entry_rcu(op, &ci->m_op_list, op_entry) { + if (op->conn != conn) + continue; + op->conn = NULL; + } + write_unlock(&ci->m_lock); + + fp->conn = NULL; + fp->tcon = NULL; + fp->volatile_id = KSMBD_NO_FID; + + return true; }
void ksmbd_close_tree_conn_fds(struct ksmbd_work *work) @@ -687,6 +756,68 @@ void ksmbd_free_global_file_table(void) ksmbd_destroy_file_table(&global_ft); }
+int ksmbd_validate_name_reconnect(struct ksmbd_share_config *share, + struct ksmbd_file *fp, char *name) +{ + char *pathname, *ab_pathname; + int ret = 0; + + pathname = kmalloc(PATH_MAX, GFP_KERNEL); + if (!pathname) + return -EACCES; + + ab_pathname = d_path(&fp->filp->f_path, pathname, PATH_MAX); + if (IS_ERR(ab_pathname)) { + kfree(pathname); + return -EACCES; + } + + if (name && strcmp(&ab_pathname[share->path_sz + 1], name)) { + ksmbd_debug(SMB, "invalid name reconnect %s\n", name); + ret = -EINVAL; + } + + kfree(pathname); + + return ret; +} + +int ksmbd_reopen_durable_fd(struct ksmbd_work *work, struct ksmbd_file *fp) +{ + struct ksmbd_inode *ci; + struct oplock_info *op; + + if (!fp->is_durable || fp->conn || fp->tcon) { + pr_err("Invalid durable fd [%p:%p]\n", fp->conn, fp->tcon); + return -EBADF; + } + + if (has_file_id(fp->volatile_id)) { + pr_err("Still in use durable fd: %llu\n", fp->volatile_id); + return -EBADF; + } + + fp->conn = work->conn; + fp->tcon = work->tcon; + + ci = fp->f_ci; + write_lock(&ci->m_lock); + list_for_each_entry_rcu(op, &ci->m_op_list, op_entry) { + if (op->conn) + continue; + op->conn = fp->conn; + } + write_unlock(&ci->m_lock); + + __open_id(&work->sess->file_table, fp, OPEN_ID_TYPE_VOLATILE_ID); + if (!has_file_id(fp->volatile_id)) { + fp->conn = NULL; + fp->tcon = NULL; + return -EBADF; + } + return 0; +} + int ksmbd_init_file_table(struct ksmbd_file_table *ft) { ft->idr = kzalloc(sizeof(struct idr), GFP_KERNEL); diff --git a/fs/smb/server/vfs_cache.h b/fs/smb/server/vfs_cache.h index a528f0cc775ae..ed44fb4e18e79 100644 --- a/fs/smb/server/vfs_cache.h +++ b/fs/smb/server/vfs_cache.h @@ -14,6 +14,7 @@ #include <linux/workqueue.h>
#include "vfs.h" +#include "mgmt/share_config.h"
/* Windows style file permissions for extended response */ #define FILE_GENERIC_ALL 0x1F01FF @@ -106,6 +107,9 @@ struct ksmbd_file { int dot_dotdot[2]; unsigned int f_state; bool reserve_lease_break; + bool is_durable; + bool is_persistent; + bool is_resilient; };
static inline void set_ctx_actor(struct dir_context *ctx, @@ -141,7 +145,9 @@ struct ksmbd_file *ksmbd_lookup_fd_slow(struct ksmbd_work *work, u64 id, void ksmbd_fd_put(struct ksmbd_work *work, struct ksmbd_file *fp); struct ksmbd_inode *ksmbd_inode_lookup_lock(struct dentry *d); void ksmbd_inode_put(struct ksmbd_inode *ci); +struct ksmbd_file *ksmbd_lookup_global_fd(unsigned long long id); struct ksmbd_file *ksmbd_lookup_durable_fd(unsigned long long id); +void ksmbd_put_durable_fd(struct ksmbd_file *fp); struct ksmbd_file *ksmbd_lookup_fd_cguid(char *cguid); struct ksmbd_file *ksmbd_lookup_fd_inode(struct dentry *dentry); unsigned int ksmbd_open_durable_fd(struct ksmbd_file *fp); @@ -173,6 +179,9 @@ void ksmbd_set_inode_pending_delete(struct ksmbd_file *fp); void ksmbd_clear_inode_pending_delete(struct ksmbd_file *fp); void ksmbd_fd_set_delete_on_close(struct ksmbd_file *fp, int file_info); +int ksmbd_reopen_durable_fd(struct ksmbd_work *work, struct ksmbd_file *fp); +int ksmbd_validate_name_reconnect(struct ksmbd_share_config *share, + struct ksmbd_file *fp, char *name); int ksmbd_init_file_cache(void); void ksmbd_exit_file_cache(void); #endif /* __VFS_CACHE_H__ */