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Date: Wed, 10 Nov 1999 13:48:17 -0700
From: "Jeff V. Merkey" <jmerkey@timpanogas.com>
Organization: TRG, Inc.
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To: linux-kernel@vger.rutgers.edu
Subject: Getting IOCTL's into VFS File System Drivers
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Alan/Ingo/Pavel,
Do you one you guys know a good way to get IOCTL calls into the FS
drivers? I noticed there is an IOCTL path for FILE objects, but there
does not appear to be a general purpose IOCTL call to the File System
Drivers themselves (but there is to symbolic devices files created by
these FS's). I basically need this for the utilities that create and
config volumes and mirroring so I can query as to whether a file system
is mounted from the tools, and prohibit users from blowing away volume
segments, namespaces, etc. while a volume is mounted. There are also
some question/answer stuff during boot from a Netware file system if
NWFSCK (Netware volume repair utility) gets invoked due to mounting
problems. I need to be able to pass back and forth, such as asking
whether an imcomplete mirror group should be activated and failing
mirrors dropped during system boot if FS errors are detected.
I am calling open() from the utilities with symbolic handles for device
objects (i.e. /dev/hda, /dev/hdb, etc.) and this is how I am creating
partitions, volumes, etc. Is there a symbolic handle that will map to
the FS driver so I can pass IOCTL commands between the utilities and the
file system driver, like /proc/filesystems/nwfs or something to that
effect? I religously poured over the code in Linux until 4 a.m. this
morning, and it doesn't look like this is supported.
Thanks in advance for the fabulous help.
Jeff
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