Very short explanation for the impatient!!!
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Very short explanation for the impatient!!!
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Umsdos is a file system driver that run on top the MSDOS fs driver.
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Umsdos is a file system driver that run on top the MSDOS fs driver.
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It is written by Jacques Gelinas (jacques@solucorp.qc.ca)
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It is written by Jacques Gelinas (jacques@solucorp.qc.ca)
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Umsdos is not a file system per se, but a twist to make a boring
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Umsdos is not a file system per se, but a twist to make a boring
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one into a useful one.
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one into a useful one.
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It gives you:
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It gives you:
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long file name
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long file name
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Permissions and owner
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Permissions and owner
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Links
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Links
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Special files (devices, pipe...)
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Special files (devices, pipe...)
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All is need to be a linux root fs.
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All is need to be a linux root fs.
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There is plenty of documentation on it in the source. A formated document
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There is plenty of documentation on it in the source. A formated document
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made from those comments is available from
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made from those comments is available from
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sunsite.unc.edu:/pub/Linux/system/Filesystems/umsdos.
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sunsite.unc.edu:/pub/Linux/system/Filesystems/umsdos.
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Mostly...
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Mostly...
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You mount a DOS partition like this
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You mount a DOS partition like this
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mount -t umsdos /dev/hda3 /mnt
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mount -t umsdos /dev/hda3 /mnt
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^
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^
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---------|
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All option are passed to the msdos drivers. Option like uid,gid etc are
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All option are passed to the msdos drivers. Option like uid,gid etc are
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given to msdos.
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given to msdos.
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The default behavior of Umsdos is to do the same thing as the msdos driver
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The default behavior of Umsdos is to do the same thing as the msdos driver
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mostly passing commands to it without much processing. Again, this is
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mostly passing commands to it without much processing. Again, this is
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the default. After doing the mount on a DOS partition, nothing special
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the default. After doing the mount on a DOS partition, nothing special
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happen. This is why all mount options are passed to the Msdos fs driver.
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happen. This is why all mount options are passed to the Msdos fs driver.
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Umsdos use a special DOS file --linux-.--- to store the information
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Umsdos use a special DOS file --linux-.--- to store the information
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which can't be handle by the normal MsDOS file system. This is the trick.
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which can't be handle by the normal MsDOS file system. This is the trick.
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--linux-.--- is optional. There is one per directory.
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--linux-.--- is optional. There is one per directory.
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**** If --linux-.--- is missing, then Umsdos process the directory the
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**** If --linux-.--- is missing, then Umsdos process the directory the
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same way the msdos driver do. Short file name, no goodies, default
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same way the msdos driver do. Short file name, no goodies, default
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owner and permissions. So each directory may have or not this
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owner and permissions. So each directory may have or not this
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--linux-.---
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--linux-.---
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Now, how to get those --linux-.---.
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Now, how to get those --linux-.---.
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\begin joke_section
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\begin joke_section
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Well send me a directory content
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Well send me a directory content
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and I will send you one customised for you.
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and I will send you one customised for you.
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$5 per directory. Add any applicable taxes.
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$5 per directory. Add any applicable taxes.
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\end joke_section
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\end joke_section
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A utility umssync creates those. The kernel maintain them. It is available
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A utility umssync creates those. The kernel maintain them. It is available
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from the same directory above (sunsite) in the file umsdos_progs-0.7.tar.gz.
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from the same directory above (sunsite) in the file umsdos_progs-0.7.tar.gz.
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A compiled version is available in umsdos_progs-0.7.bin.tar.gz.
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A compiled version is available in umsdos_progs-0.7.bin.tar.gz.
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So in our example, after mounting mnt, we do
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So in our example, after mounting mnt, we do
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umssync .
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umssync .
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This will promote this directory (a recursive option is available) to full
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This will promote this directory (a recursive option is available) to full
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umsdos capabilities (long name ...). A ls -l before and after won't show
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umsdos capabilities (long name ...). A ls -l before and after won't show
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much difference however. The file which were there are still there. But now
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much difference however. The file which were there are still there. But now
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you can do all this:
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you can do all this:
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chmod 644 *
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chmod 644 *
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chown you.your_groupe *
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chown you.your_groupe *
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ls >THIS_IS.A.VERY.LONG.NAME
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ls >THIS_IS.A.VERY.LONG.NAME
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ln -s toto tata
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ln -s toto tata
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ls -l
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ls -l
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Once a directory is promoted, all subdirectory created will inherit that
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Once a directory is promoted, all subdirectory created will inherit that
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promotion.
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promotion.
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What happen if you boot DOS and create files in those promoted directories ?
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What happen if you boot DOS and create files in those promoted directories ?
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Umsdos won't notice new files, but will signal removed file (it won't crash).
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Umsdos won't notice new files, but will signal removed file (it won't crash).
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Using umssync in /etc/rc will make sure the DOS directory is in sync with
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Using umssync in /etc/rc will make sure the DOS directory is in sync with
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the --linux-.---.
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the --linux-.---.
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It is a good idea to put the following command in your RC file just
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It is a good idea to put the following command in your RC file just
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after the "mount -a":
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after the "mount -a":
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mount -a
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mount -a
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/sbin/umssync -i+ -c+ -r99 /umsdos_mount_point
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/sbin/umssync -i+ -c+ -r99 /umsdos_mount_point
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(You put one for each umsdos mount point in the fstab)
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(You put one for each umsdos mount point in the fstab)
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This will insure nice operation. A umsdos.fsck is in the making,
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This will insure nice operation. A umsdos.fsck is in the making,
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so you will be allowed to managed umsdos partition in the same way
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so you will be allowed to managed umsdos partition in the same way
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other filesystem are, using the generic fsck front end.
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other filesystem are, using the generic fsck front end.
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Hope this helps!
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Hope this helps!
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