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Devices and Volumes
5-5 VOLUME OPERATIONS
Five general operations can be performed on a volume:
■
A volume can be opened (mounted) . During the opening of a volume, file system
control structures are read from the underlying device, parsed and verified.
■
Files can be accessed on a volume. A file is a linear data sequence (‘file contents’)
associated with some logical, typically human-readable identifier (‘file name’).
Additional properties, such as size, update date/time and access mode (e.g., read-only,
write-only, read-write) may be associated with a file. File accesses constitute reading
data from files, writing data to files, creating new files, renaming files, copying files, etc.
File access is accomplished via file module-level functions, which are covered in
Chapter 5.
■
Directories can be accessed on a volume. A directory is a container for files and
other directories. Operations include iterating through the contents of the directory,
creating new directories, renaming directories, etc. Directory access is accomplished via
directory module-level functions, which are covered in Chapter 6.
■
A volume can be formatted . (More specifically, high-level formatted.) Formatting
writes the control information for a file system to the partition on which a volume is
located.
■
A volume can be closed (unmounted) . During the closing of a volume, any cached
data is written to the underlying device and associated structures are freed.
For information about using volume names, see section 4-2 “μC/FS Device and Volume
Names” on page 61. For FAT-specific volume functions, see Chapter 9, “File Systems: FAT”
on page 109.
Function
FSVol_CacheAssign()
FSVol_CacheInvalidate()
FSVol_CacheFlush()
FSVol_Close()
Description
Assign cache to volume.
Invalidate cache for volume.
Flush cache for volume.
Close (unmount) volume.
Valid for Unmounted Volume?
Yes
No
No
Yes
76
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