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Description Background mount Should the mount initially fail (for instance, if the server is down), the mount process will send itself to background processing and continue trying to execute until it is successful This is useful for file systems mounted at boot time, because it keeps the system from hanging at the mount command if the server is down Specifies an interruptible mount If a process has pending I/O on a mounted partition, this option allows the process to be interrupted and the I/O call to be dropped For more information, see The Importance of the intr Option, later in this section This is an implicit default option If an NFS file operation has a major timeout, then a server not responding message is reported on the console and the client continues retrying indefinitely

// This program will not compile class ScopeErr { public static void main(String args[]) {

3:

Description Enables a soft mount for this partition, allowing the client to time out the connection after a number of retries (specified with the retrans=r option) For more information, see Soft vs Hard Mounts, later in this section The value n specifies the maximum number of connection retries for a soft-mounted system The value n is the number of bytes NFS uses when reading files from an NFS server The default value is dependent on the kernel, but is currently 4096 bytes for NFSv4 Throughput can be improved greatly by requesting a higher value (eg, rsize=32768) The value n specifies the number of bytes NFS uses when writing files to an NFS server The default value is dependent on the kernel, but is currently something like 4096 bytes for NFSv4 Throughput can be greatly improved by asking for a higher value (eg, wsize=32768) This value is negotiated with the server The value n specifies the network protocol to use to mount the NFS file system The default value in NFSv2 and NFSv3 is UDP NFSv4 servers generally support only TCP Therefore, the valid protocol types are udp and tcp Allows the use of an alternate RPC version number to contact the NFS daemon on the remote host The default value depends on the kernel, but the possible values are 2 and 3 This option is not recognized in NFSv4, where instead, you d simply state nfs4 as the file system type

int bar = 1; { // creates a new scope int bar = 2; // Compile-time error bar already defined! } } }

If you have previous programming experience, then you already know that it is fairly common to assign a value of one type to a variable of another type If the two types are compatible, then Java will perform the conversion automatically For example, it is always possible to assign an int value to a long variable However, not all types are compatible, and thus, not all type conversions are implicitly allowed For instance, there is no automatic conversion defined from double to byte Fortunately, it is still possible to obtain a conversion between incompatible types To do so, you must use a cast, which performs an explicit conversion between incompatible types Let s look at both automatic type conversions and casting

Table 22-2 Mount Options for NFS (cont)

When one type of data is assigned to another type of variable, an automatic type conversion will take place if the following two conditions are met:

CHAPTER 7 WIRED!

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When these two conditions are met, a widening conversion takes place For example, the int type is always large enough to hold all valid byte values, so no explicit cast statement is required For widening conversions, the numeric types, including integer and floating-point types, are compatible with each other However, there are no automatic conversions from the numeric types to char or boolean Also, char and boolean are not compatible with each other As mentioned earlier, Java also performs an automatic type conversion when storing a literal integer constant into variables of type byte, short, long, or char