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#Excel file locked for editing dynamic file sharing driver#
Anyone developing a device driver other than an installable file system should use the Windows Driver Kit (WDK). Anyone implementing a file system should use the Installable File System (IFS) Kit. Applications generally leave opportunistic lock management to the file system drivers. Typically, file systems implement support for opportunistic locks. The only practical use is to test a network redirector or a server opportunistic lock handler. Opportunistic locks are of very limited use for applications. An error will be returned by DeviceIoControl if an attempt is made to do this. Local applications should not attempt to request opportunistic locks from remote servers. The maximum number of concurrent opportunistic locks that you can create is limited only by the amount of available memory. When used in this way, the opportunistic lock is effectively a semaphore managed by the local server, and is mainly used for the purposes of data coherency in the file and file access notification.īefore using opportunistic locks in your application, you should be familiar with the file access and sharing modes described in Creating and Opening Files. In this case, the local application directly requests an opportunistic lock from the local file system and caches the file locally. However, opportunistic locks can also be used when a local application requests access to a local file, and access by other applications and processes must be delegated to prevent corruption of the file. The network redirector and the server involved open and close the opportunistic locks automatically.
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When a local application requests access to a remote file, the implementation of opportunistic locks is transparent to the application. In other words, the server grants such locks whenever other factors make the locks possible. From the point of view of the client, they are opportunistic. They are requests from the client to the server. Opportunistic locks are not commands by the client to the server. In other words, if data is coherent, data on the server and all the clients is synchronized. Data that is coherent is data that is the same across the network. Opportunistic locks coordinate data caching and coherency between clients and servers and among multiple clients. Opportunistic locks are used by network redirectors on clients with remote servers, as well as by client applications on local servers. In most cases, a client requests an opportunistic lock so it can cache data locally, thus reducing network traffic and improving apparent response time. An opportunistic lock (also called an oplock) is a lock placed by a client on a file residing on a server.