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→Installing Linux on FAT {{anchor| on and booting it from FAT volumes using umsdos}}: fix syntaxhighlight error |
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== Commonalities ==
As mentioned previously, all of the Linux filesystem drivers support all of the three File Allocation Table sizes, 12-bit, 16-bit, and 32-bit. Other common features that they all support are various Linux mounting options (specified with the <code>-o</code> option to the <code>[[mount (Unix)|mount]]</code> command):<ref name="Smith1"/><ref name="Smith2"/>
;<code>uid</code> and <code>gid</code>:These two options tell the filesystem driver to set the (default, in the case of ''{{Not a typo|umsdos}}'') owner user ID and group ID to be a single, specified, value for all files in the volume. Both IDs are specified as numeric values (as to be found in the <code>[[/etc/passwd]]</code> file). So, for example, to specify to the ''{{Not a typo|vfat}}'' filesystem driver that all files and directories are to have owner ID 745 and group ID 15, the <code>mount</code> command would be invoked as
;<code>umask</code>:This option sets the [[umask]] to apply globally to all files in the volume. For example, to specify to the ''{{Not a typo|vfat}}'' filesystem driver that no "group" or "other" access is to be allowed, the <code>mount</code> command would be invoked as {{nowrap|1=<
;<code>conv</code>:This option specifies ''file content conversion'' semantics. It is possible for the filesystem drivers to convert the newline conventions in files, between LF termination and CRLF termination, on the fly as files are read and written. By default this conversion is entirely disabled. The filesystem drivers can perform conversion for some files, attempting to auto-detect what files to convert based upon the extension portion of the filename, or globally for all files. These three conversion levels are specified as <code>conv=b</code> (for "binary"), <code>conv=a</code> (for "auto-detect"), and <code>conv=t</code> (for "text"), respectively. The latter two options carry an inherent risk of corrupting non-text file data. No conversion at all is the default.<ref name="Smith1"/><ref name="Smith2"/>
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Although the filesystem drivers in the kernel make it possible to access files and directories on FAT formatted volumes in the normal manner, it is also possible to do so without kernel driver support, using the utility programs that form the [[mtools]] utility suite. Like the ''{{Not a typo|vfat}}'' FAT filesystem driver, {{Not a typo|mountlo}} provides long filename support using the same disc data structures that Microsoft Windows uses.<ref name="Smith2"/><ref name="Rajagopal">{{cite book |title=Multi-operating system networking: living with Unix, Netware, and NT |series=Auerbach Best Practices Series |author-first=Raj |author-last=Rajagopal |publisher=[[CRC Press]] |year=2000 |pages=[https://archive.org/details/multioperatingsy0000unse/page/25 25–21] |isbn=978-0-8493-9831-5 |url=https://archive.org/details/multioperatingsy0000unse/page/25 }}</ref><ref name="Welsh">{{cite book |title=Running Linux |series=Essential Guide to Linux |author-first=Matt |author-last=Welsh |edition=4th |publisher=[[O'Reilly Media, Inc.]] |year=2003 |isbn=978-0-596-00272-5 |pages=405}}</ref>
Alternately, one of the [[FUSE (Linux)|FUSE]] filesystem drivers may be used—FatFuse, FuseFat or {{Proper name|mountlo}}.<ref>{{cite web |url=
== POSIX overlay filesystem ==
A modern equivalent of UMSDOS is POSIX Overlay Filesystem ({{Not a typo|posixovl}}). It works in FUSE.<ref>{{Cite web|url=
==See also==
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