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Fri Jan 21 17:31:43 GMT 2000
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Toby Jaffey <toby@earth.li>
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Added modules/mount_changer.c
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I have an NEC CD-ROM DRIVE:251, 4X CD-ROM changer w/4 slots, 128kB
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Cache. The drive can only mount one CD at a time. To change the CD in
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use you must unmount, swap slots (lots of ioctl() calls) and
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remount. Using autofs, this module allows the illusion that all CDs
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are mounted at any given time. Only when data is requested does the
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drive need to swap. Clearly, this is awful for simultaneous reads
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across many disks, but I use it to create mp3 playlists spanning
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The code is mostly clean, but rather than adding a new "mediatype" to
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the config file, I set my drive up as fstype=changer. The assumption
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is made that all of the disks are of type iso9660. This is a bad
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thing, but it works for me.
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[hpa: I believe these problems are due to a design error. The changer
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should be a lookup type, rather than a filesystem (mount) type.]
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My /etc/auto.master says:
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/mnt/changer /etc/auto.misc
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My /etc/auto.misc says:
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1 -fstype=changer :/dev/hdb
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2 -fstype=changer :/dev/hdb
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3 -fstype=changer :/dev/hdb
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4 -fstype=changer :/dev/hdb
added
removed
README.changer
