nine smb3 client fixes

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Merge tag 'v6.16-rc2-smb3-client-fixes-v2' of git://git.samba.org/sfrench/cifs-2.6

Pull smb client fixes from Steve French:

 - Multichannel channel allocation fix for Kerberos mounts

 - Two reconnect fixes

 - Fix netfs_writepages crash with smbdirect/RDMA

 - Directory caching fix

 - Three minor cleanup fixes

 - Log error when close cached dirs fails

* tag 'v6.16-rc2-smb3-client-fixes-v2' of git://git.samba.org/sfrench/cifs-2.6:
  smb: minor fix to use SMB2_NTLMV2_SESSKEY_SIZE for auth_key size
  smb: minor fix to use sizeof to initialize flags_string buffer
  smb: Use loff_t for directory position in cached_dirents
  smb: Log an error when close_all_cached_dirs fails
  cifs: Fix prepare_write to negotiate wsize if needed
  smb: client: fix max_sge overflow in smb_extract_folioq_to_rdma()
  smb: client: fix first command failure during re-negotiation
  cifs: Remove duplicate fattr->cf_dtype assignment from wsl_to_fattr() function
  smb: fix secondary channel creation issue with kerberos by populating hostname when adding channels

fs/smb/client/cached_dir.c

@@ -509,8 +509,17 @@ void close_all_cached_dirs(struct cifs_sb_info *cifs_sb)
 		spin_lock(&cfids->cfid_list_lock);
 		list_for_each_entry(cfid, &cfids->entries, entry) {
 			tmp_list = kmalloc(sizeof(*tmp_list), GFP_ATOMIC);
-			if (tmp_list == NULL)
-				break;
+			if (tmp_list == NULL) {
+				/*
+				 * If the malloc() fails, we won't drop all
+				 * dentries, and unmounting is likely to trigger
+				 * a 'Dentry still in use' error.
+				 */
+				cifs_tcon_dbg(VFS, "Out of memory while dropping dentries\n");
+				spin_unlock(&cfids->cfid_list_lock);
+				spin_unlock(&cifs_sb->tlink_tree_lock);
+				goto done;
+			}
 			spin_lock(&cfid->fid_lock);
 			tmp_list->dentry = cfid->dentry;
 			cfid->dentry = NULL;
@@ -522,6 +531,7 @@ void close_all_cached_dirs(struct cifs_sb_info *cifs_sb)
 	}
 	spin_unlock(&cifs_sb->tlink_tree_lock);
 
+done:
 	list_for_each_entry_safe(tmp_list, q, &entry, entry) {
 		list_del(&tmp_list->entry);
 		dput(tmp_list->dentry);

fs/smb/client/cached_dir.h

@@ -26,7 +26,7 @@ struct cached_dirents {
 			    * open file instance.
 			    */
 	struct mutex de_mutex;
-	int pos;		 /* Expected ctx->pos */
+	loff_t pos;		 /* Expected ctx->pos */
 	struct list_head entries;
 };
 

fs/smb/client/cifs_debug.c

@@ -1105,7 +1105,7 @@ static ssize_t cifs_security_flags_proc_write(struct file *file,
 	if ((count < 1) || (count > 11))
 		return -EINVAL;
 
-	memset(flags_string, 0, 12);
+	memset(flags_string, 0, sizeof(flags_string));
 
 	if (copy_from_user(flags_string, buffer, count))
 		return -EFAULT;

fs/smb/client/cifs_ioctl.h

@@ -61,7 +61,7 @@ struct smb_query_info {
 struct smb3_key_debug_info {
 	__u64	Suid;
 	__u16	cipher_type;
-	__u8	auth_key[16]; /* SMB2_NTLMV2_SESSKEY_SIZE */
+	__u8	auth_key[SMB2_NTLMV2_SESSKEY_SIZE];
 	__u8	smb3encryptionkey[SMB3_SIGN_KEY_SIZE];
 	__u8	smb3decryptionkey[SMB3_SIGN_KEY_SIZE];
 } __packed;

fs/smb/client/connect.c

@@ -4199,6 +4199,7 @@ retry:
 		return 0;
 	}
 
+	server->lstrp = jiffies;
 	server->tcpStatus = CifsInNegotiate;
 	spin_unlock(&server->srv_lock);
 

fs/smb/client/file.c

@@ -52,6 +52,7 @@ static void cifs_prepare_write(struct netfs_io_subrequest *subreq)
 	struct netfs_io_stream *stream = &req->rreq.io_streams[subreq->stream_nr];
 	struct TCP_Server_Info *server;
 	struct cifsFileInfo *open_file = req->cfile;
+	struct cifs_sb_info *cifs_sb = CIFS_SB(wdata->rreq->inode->i_sb);
 	size_t wsize = req->rreq.wsize;
 	int rc;
 
@@ -63,6 +64,10 @@ static void cifs_prepare_write(struct netfs_io_subrequest *subreq)
 	server = cifs_pick_channel(tlink_tcon(open_file->tlink)->ses);
 	wdata->server = server;
 
+	if (cifs_sb->ctx->wsize == 0)
+		cifs_negotiate_wsize(server, cifs_sb->ctx,
+				     tlink_tcon(req->cfile->tlink));
+
 retry:
 	if (open_file->invalidHandle) {
 		rc = cifs_reopen_file(open_file, false);
@@ -160,10 +165,9 @@ static int cifs_prepare_read(struct netfs_io_subrequest *subreq)
 	server = cifs_pick_channel(tlink_tcon(req->cfile->tlink)->ses);
 	rdata->server = server;
 
-	if (cifs_sb->ctx->rsize == 0) {
+	if (cifs_sb->ctx->rsize == 0)
 		cifs_negotiate_rsize(server, cifs_sb->ctx,
 				     tlink_tcon(req->cfile->tlink));
-	}
 
 	rc = server->ops->wait_mtu_credits(server, cifs_sb->ctx->rsize,
 					   &size, &rdata->credits);

fs/smb/client/ioctl.c

@@ -506,7 +506,7 @@ long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
 				le16_to_cpu(tcon->ses->server->cipher_type);
 			pkey_inf.Suid = tcon->ses->Suid;
 			memcpy(pkey_inf.auth_key, tcon->ses->auth_key.response,
-					16 /* SMB2_NTLMV2_SESSKEY_SIZE */);
+				  SMB2_NTLMV2_SESSKEY_SIZE);
 			memcpy(pkey_inf.smb3decryptionkey,
 			      tcon->ses->smb3decryptionkey, SMB3_SIGN_KEY_SIZE);
 			memcpy(pkey_inf.smb3encryptionkey,

fs/smb/client/reparse.c

@@ -1172,7 +1172,6 @@ out:
 	if (!have_xattr_dev && (tag == IO_REPARSE_TAG_LX_CHR || tag == IO_REPARSE_TAG_LX_BLK))
 		return false;
 
-	fattr->cf_dtype = S_DT(fattr->cf_mode);
 	return true;
 }
 

fs/smb/client/sess.c

@@ -498,8 +498,7 @@ cifs_ses_add_channel(struct cifs_ses *ses,
 	ctx->domainauto = ses->domainAuto;
 	ctx->domainname = ses->domainName;
 
-	/* no hostname for extra channels */
-	ctx->server_hostname = "";
+	ctx->server_hostname = ses->server->hostname;
 
 	ctx->username = ses->user_name;
 	ctx->password = ses->password;

fs/smb/client/smbdirect.c

@@ -2589,13 +2589,14 @@ static ssize_t smb_extract_folioq_to_rdma(struct iov_iter *iter,
 		size_t fsize = folioq_folio_size(folioq, slot);
 
 		if (offset < fsize) {
-			size_t part = umin(maxsize - ret, fsize - offset);
+			size_t part = umin(maxsize, fsize - offset);
 
 			if (!smb_set_sge(rdma, folio_page(folio, 0), offset, part))
 				return -EIO;
 
 			offset += part;
 			ret += part;
+			maxsize -= part;
 		}
 
 		if (offset >= fsize) {
@@ -2610,7 +2611,7 @@ static ssize_t smb_extract_folioq_to_rdma(struct iov_iter *iter,
 				slot = 0;
 			}
 		}
-	} while (rdma->nr_sge < rdma->max_sge || maxsize > 0);
+	} while (rdma->nr_sge < rdma->max_sge && maxsize > 0);
 
 	iter->folioq = folioq;
 	iter->folioq_slot = slot;