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synced 2024-08-27 19:29:37 +00:00
smb3: do not send compression info by default
Since in theory a server could respond with compressed read responses even if not requested on read request (assuming that a compression negcontext is sent in negotiate protocol) - do not send compression information during negotiate protocol unless the user asks for compression explicitly (compression is experimental), and add a mount warning that compression is experimental. Signed-off-by: Steve French <stfrench@microsoft.com> Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
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parent
412094a8fb
commit
9fe5ff1c5d
3 changed files with 21 additions and 10 deletions
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@ -601,6 +601,7 @@ struct smb_vol {
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__u64 snapshot_time; /* needed for timewarp tokens */
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__u32 handle_timeout; /* persistent and durable handle timeout in ms */
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unsigned int max_credits; /* smb3 max_credits 10 < credits < 60000 */
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__u16 compression; /* compression algorithm 0xFFFF default 0=disabled */
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};
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/**
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@ -97,6 +97,7 @@ enum {
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Opt_persistent, Opt_nopersistent,
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Opt_resilient, Opt_noresilient,
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Opt_domainauto, Opt_rdma, Opt_modesid,
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Opt_compress,
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/* Mount options which take numeric value */
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Opt_backupuid, Opt_backupgid, Opt_uid,
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@ -213,6 +214,7 @@ static const match_table_t cifs_mount_option_tokens = {
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{ Opt_echo_interval, "echo_interval=%s" },
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{ Opt_max_credits, "max_credits=%s" },
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{ Opt_snapshot, "snapshot=%s" },
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{ Opt_compress, "compress=%s" },
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{ Opt_blank_user, "user=" },
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{ Opt_blank_user, "username=" },
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@ -1915,6 +1917,11 @@ cifs_parse_mount_options(const char *mountdata, const char *devname,
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case Opt_rdma:
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vol->rdma = true;
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break;
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case Opt_compress:
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vol->compression = UNKNOWN_TYPE;
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cifs_dbg(VFS,
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"SMB3 compression support is experimental\n");
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break;
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/* Numeric Values */
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case Opt_backupuid:
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@ -2691,6 +2698,7 @@ cifs_get_tcp_session(struct smb_vol *volume_info)
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tcp_ses->sequence_number = 0;
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tcp_ses->reconnect_instance = 1;
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tcp_ses->lstrp = jiffies;
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tcp_ses->compress_algorithm = cpu_to_le16(volume_info->compression);
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spin_lock_init(&tcp_ses->req_lock);
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INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
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INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
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@ -521,7 +521,7 @@ build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)
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static void
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assemble_neg_contexts(struct smb2_negotiate_req *req,
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unsigned int *total_len)
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struct TCP_Server_Info *server, unsigned int *total_len)
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{
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char *pneg_ctxt = (char *)req;
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unsigned int ctxt_len;
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@ -551,17 +551,19 @@ assemble_neg_contexts(struct smb2_negotiate_req *req,
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*total_len += ctxt_len;
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pneg_ctxt += ctxt_len;
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build_compression_ctxt((struct smb2_compression_capabilities_context *)
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if (server->compress_algorithm) {
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build_compression_ctxt((struct smb2_compression_capabilities_context *)
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pneg_ctxt);
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ctxt_len = DIV_ROUND_UP(
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sizeof(struct smb2_compression_capabilities_context), 8) * 8;
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*total_len += ctxt_len;
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pneg_ctxt += ctxt_len;
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ctxt_len = DIV_ROUND_UP(
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sizeof(struct smb2_compression_capabilities_context),
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8) * 8;
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*total_len += ctxt_len;
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pneg_ctxt += ctxt_len;
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req->NegotiateContextCount = cpu_to_le16(4);
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} else
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req->NegotiateContextCount = cpu_to_le16(3);
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build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
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*total_len += sizeof(struct smb2_posix_neg_context);
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req->NegotiateContextCount = cpu_to_le16(4);
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}
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static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
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@ -829,7 +831,7 @@ SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
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if ((ses->server->vals->protocol_id == SMB311_PROT_ID) ||
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(strcmp(ses->server->vals->version_string,
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SMBDEFAULT_VERSION_STRING) == 0))
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assemble_neg_contexts(req, &total_len);
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assemble_neg_contexts(req, server, &total_len);
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}
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iov[0].iov_base = (char *)req;
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iov[0].iov_len = total_len;
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