add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/fs/cifs/dir.c
..
..
@@ -69,11 +69,10 @@
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 		return full_path;
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 	if (dfsplen)
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-		strncpy(full_path, tcon->treeName, dfsplen);
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+		memcpy(full_path, tcon->treeName, dfsplen);
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 	full_path[dfsplen] = CIFS_DIR_SEP(cifs_sb);
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-	strncpy(full_path + dfsplen + 1, vol->prepath, pplen);
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+	memcpy(full_path + dfsplen + 1, vol->prepath, pplen);
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 	convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
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-	full_path[dfsplen + pplen] = 0; /* add trailing null */
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 	return full_path;
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 }
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..
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@@ -126,7 +125,7 @@
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 	}
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 	rcu_read_unlock();
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-	full_path = kmalloc(namelen+1, GFP_KERNEL);
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+	full_path = kmalloc(namelen+1, GFP_ATOMIC);
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 	if (full_path == NULL)
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 		return full_path;
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 	full_path[namelen] = 0;	/* trailing null */
..
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@@ -245,10 +244,8 @@
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 		*oplock = REQ_OPLOCK;
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 	full_path = build_path_from_dentry(direntry);
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-	if (full_path == NULL) {
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-		rc = -ENOMEM;
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-		goto out;
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-	}
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+	if (!full_path)
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+		return -ENOMEM;
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 	if (tcon->unix_ext && cap_unix(tcon->ses) && !tcon->broken_posix_open &&
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 	    (CIFS_UNIX_POSIX_PATH_OPS_CAP &
..
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@@ -358,13 +355,10 @@
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 	if (!tcon->unix_ext && (mode & S_IWUGO) == 0)
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 		create_options |= CREATE_OPTION_READONLY;
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357
 
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-	if (backup_cred(cifs_sb))
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-		create_options |= CREATE_OPEN_BACKUP_INTENT;
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-
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 	oparms.tcon = tcon;
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 	oparms.cifs_sb = cifs_sb;
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 	oparms.desired_access = desired_access;
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-	oparms.create_options = create_options;
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+	oparms.create_options = cifs_create_options(cifs_sb, create_options);
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 	oparms.disposition = disposition;
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 	oparms.path = full_path;
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 	oparms.fid = fid;
..
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@@ -417,6 +411,7 @@
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 		rc = cifs_get_inode_info_unix(&newinode, full_path, inode->i_sb,
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 					      xid);
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 	else {
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+		/* TODO: Add support for calling POSIX query info here, but passing in fid */
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 		rc = cifs_get_inode_info(&newinode, full_path, buf, inode->i_sb,
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 					 xid, fid);
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 		if (newinode) {
..
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@@ -472,7 +467,7 @@
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 	struct tcon_link *tlink;
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 	struct cifs_tcon *tcon;
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 	struct TCP_Server_Info *server;
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-	struct cifs_fid fid;
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+	struct cifs_fid fid = {};
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 	struct cifs_pending_open open;
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 	__u32 oplock;
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 	struct cifsFileInfo *file_info;
..
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@@ -620,20 +615,10 @@
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 {
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 	int rc = -EPERM;
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 	unsigned int xid;
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-	int create_options = CREATE_NOT_DIR | CREATE_OPTION_SPECIAL;
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 	struct cifs_sb_info *cifs_sb;
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 	struct tcon_link *tlink;
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 	struct cifs_tcon *tcon;
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-	struct cifs_io_parms io_parms;
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 	char *full_path = NULL;
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-	struct inode *newinode = NULL;
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-	__u32 oplock = 0;
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-	struct cifs_fid fid;
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-	struct cifs_open_parms oparms;
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-	FILE_ALL_INFO *buf = NULL;
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-	unsigned int bytes_written;
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-	struct win_dev *pdev;
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-	struct kvec iov[2];
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 	if (!old_valid_dev(device_number))
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 		return -EINVAL;
..
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@@ -653,103 +638,12 @@
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 		goto mknod_out;
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 	}
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-	if (tcon->unix_ext) {
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-		struct cifs_unix_set_info_args args = {
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-			.mode	= mode & ~current_umask(),
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-			.ctime	= NO_CHANGE_64,
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-			.atime	= NO_CHANGE_64,
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-			.mtime	= NO_CHANGE_64,
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-			.device	= device_number,
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-		};
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-		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {
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-			args.uid = current_fsuid();
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-			args.gid = current_fsgid();
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-		} else {
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-			args.uid = INVALID_UID; /* no change */
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-			args.gid = INVALID_GID; /* no change */
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-		}
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-		rc = CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args,
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-					    cifs_sb->local_nls,
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-					    cifs_remap(cifs_sb));
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-		if (rc)
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-			goto mknod_out;
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-
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-		rc = cifs_get_inode_info_unix(&newinode, full_path,
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-						inode->i_sb, xid);
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-
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-		if (rc == 0)
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-			d_instantiate(direntry, newinode);
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-		goto mknod_out;
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-	}
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-
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-	if (!S_ISCHR(mode) && !S_ISBLK(mode))
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-		goto mknod_out;
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-
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-	if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL))
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-		goto mknod_out;
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-
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-
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-	cifs_dbg(FYI, "sfu compat create special file\n");
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-
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-	buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
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-	if (buf == NULL) {
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-		rc = -ENOMEM;
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-		goto mknod_out;
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-	}
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-
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-	if (backup_cred(cifs_sb))
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-		create_options |= CREATE_OPEN_BACKUP_INTENT;
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-
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-	oparms.tcon = tcon;
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-	oparms.cifs_sb = cifs_sb;
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-	oparms.desired_access = GENERIC_WRITE;
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-	oparms.create_options = create_options;
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-	oparms.disposition = FILE_CREATE;
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-	oparms.path = full_path;
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-	oparms.fid = &fid;
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-	oparms.reconnect = false;
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-
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-	if (tcon->ses->server->oplocks)
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-		oplock = REQ_OPLOCK;
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-	else
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-		oplock = 0;
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-	rc = tcon->ses->server->ops->open(xid, &oparms, &oplock, buf);
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-	if (rc)
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-		goto mknod_out;
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-
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-	/*
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-	 * BB Do not bother to decode buf since no local inode yet to put
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-	 * timestamps in, but we can reuse it safely.
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-	 */
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-
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-	pdev = (struct win_dev *)buf;
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-	io_parms.pid = current->tgid;
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-	io_parms.tcon = tcon;
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-	io_parms.offset = 0;
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-	io_parms.length = sizeof(struct win_dev);
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-	iov[1].iov_base = buf;
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-	iov[1].iov_len = sizeof(struct win_dev);
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-	if (S_ISCHR(mode)) {
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-		memcpy(pdev->type, "IntxCHR", 8);
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-		pdev->major = cpu_to_le64(MAJOR(device_number));
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-		pdev->minor = cpu_to_le64(MINOR(device_number));
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-		rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
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-							&bytes_written, iov, 1);
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-	} else if (S_ISBLK(mode)) {
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-		memcpy(pdev->type, "IntxBLK", 8);
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-		pdev->major = cpu_to_le64(MAJOR(device_number));
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-		pdev->minor = cpu_to_le64(MINOR(device_number));
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-		rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
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-							&bytes_written, iov, 1);
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-	}
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-	tcon->ses->server->ops->close(xid, tcon, &fid);
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-	d_drop(direntry);
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-
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-	/* FIXME: add code here to set EAs */
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+	rc = tcon->ses->server->ops->make_node(xid, inode, direntry, tcon,
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+					       full_path, mode,
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+					       device_number);
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644
 
750
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 mknod_out:
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 	kfree(full_path);
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-	kfree(buf);
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 	free_xid(xid);
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 	cifs_put_tlink(tlink);
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 	return rc;
..
..
@@ -807,7 +701,9 @@
807
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 	cifs_dbg(FYI, "Full path: %s inode = 0x%p\n",
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 		 full_path, d_inode(direntry));
809
703
 
810
-	if (pTcon->unix_ext) {
704
+	if (pTcon->posix_extensions)
705
+		rc = smb311_posix_get_inode_info(&newInode, full_path, parent_dir_inode->i_sb, xid);
706
+	else if (pTcon->unix_ext) {
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 		rc = cifs_get_inode_info_unix(&newInode, full_path,
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 					      parent_dir_inode->i_sb, xid);
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 	} else {