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Embedded Linux Primer: A Practical, Real-World ApproachMany utilities use this information to determine the characteristics of system devices or to enforce system policies, such as power management and hot-plug capability. 9.9. Other File Systems Numerous file systems are supported under Linux. Space does not permit coverage of all of them. However, you should be aware of some other important file systems frequently found in embedded systems. The ramfs file system is best considered from the context of the Linux source code module that implements it. Listing 9-19 reproduces the first several lines of that file. Listing 9-19. Linux ramfs Source Module Comments /* * Resizable simple ram filesystem for Linux. P* P* Copyright (C) 2000 Linus Torvalds. P* 2000 Transmeta Corp. P* P* Usage limits added by David Gibson, Linuxcare Australia. P* This file is released under the GPL. P*/ /* P* NOTE! This filesystem is probably most useful P* not as a real filesystem, but as an example of P* how virtual filesystems can be written. P* P* It doesn't get much simpler than this. Consider P* that this file implements the full semantics of P* a POSIX-compliant read-write filesystem ...» |
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