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EXT2SRV(4)                 Kernel Interfaces Manual                 EXT2SRV(4)

       ext2srv - ext2 file system

       ext2srv [ -vrs ] [ -f file ] [ -p passwd ] [ -g group ] [ service ]

       Ext2srv is a file server that interprets the Linux Second Extended File
       System.  A single instance of ext2srv can provide  access  to  multiple
       ext2 partitions simultaneously.

       Ext2srv  posts  a  file  descriptor named service (default ext2) in the
       /srv directory.  To access an ext2 file system on a device,  use  mount
       with  the  spec argument (see bind(1)) the name of the file holding the
       raw ext2 file system, typically the disk or partition.  If spec is  un‐
       defined in the mount, ext2srv will use file as the default name for the
       device holding the file system.

       Normally ext2srv creates a pipe to act as  the  communications  channel
       between  itself  and its clients.  The -s flag instructs ext2srv to use
       its standard input and output instead.  This  flag  also  prevents  the
       creation of an explicit service file in /srv.

       The  -v  flag  causes  verbose  output for debugging, while the -r flag
       (recommended) makes the file system read-only.  The optional -p and  -g
       flags specify Unix-format password (respectively group) files that give
       the mapping between the numeric user- and group-ID numbers in the  ext2
       file system and the strings reported by Plan 9 status inquiries.

       There  is no authentication or permission checking.  Anyone who can ac‐
       cess the ext2 file system will have full access to all its  files,  in‐
       cluding  write access if ext2srv is not started with the -r flag, irre‐
       spective of file ownership and permission flags.

       Some file system state is cached in memory, and  may  be  flushed  only
       when  the file system is unmounted.  Therefore if ext2srv is stopped or
       the machine is rebooted while an ext2 file system is still mounted, the
       superblock  on the device will have been marked `not valid' (unless the
       -r flag was used), and a fsck will be required before that file  system
       may be mounted again.

       There  is no authentication or permission checking.  The implementation
       has not tracked any changes to the  ext2  specification  since  it  was
       written.   There  may be other bugs.  It is advisable to use ext2srv in
       read-only mode whenever possible.

       Bodet Laurent (, with later updates by Russ  Cox
       and Richard Miller.