ref: 92e9b85b04214f5bf5664d0e01cdd6a30d951c22
dir: /sys/man/4/exportfs/
.TH EXPORTFS 4 .SH NAME exportfs, srvfs \- file server plumbing .SH SYNOPSIS .B exportfs [ .B -dsR ] [ .B -m .I msize ] [ .B -r .I root ] [ .B -P .I patternfile ] [ .B -S .I srvfile ] .PP .B srvfs [ .B -dR ] [ .B -p .I perm ] [ .B -P .I patternfile ] [ .B -e .I exportprog ] .I name .I path .SH DESCRIPTION .I Exportfs is a user level file server that allows Plan 9 cpu servers, rather than file servers, to export portions of a name space. It is usually started by other programs such as .IR rcpu (1) after a secure channel has been established. .I Exportfs then acts as a relay file server: operations in the imported file tree are executed on the remote server and the results returned. This gives the appearance of exporting a name space from a remote machine into a local file tree. .PP The options are: .TP .B -d Log all 9P traffic to standard error. .TP .B -P \fIpatternfile Restrict the set of exported files. .I Patternfile contains one regular expression per line, to be matched against path names relative to the current working directory and starting with .BR / . For a file to be exported, all lines with a prefix .B + must match and all those with prefix .B - must not match. .TP .B -R Make the served name space read only. .TP .B -r \fIroot Serve the name space rooted at .IR root . .TP .B -S \fIservice Serve the result of mounting .IR service . A separate mount is used for each .IR attach (5) message, to correctly handle servers in which each mount corresponds to a different client .IR e.g. , ( .IR rio (4)). .TP .B -s equivalent to .B -r .BR / ; kept for compatibility. .TP .B -m \fImsize Set the maximum message size that .I exportfs should offer to send (see .IR version (5)); this helps tunneled 9P connections to avoid unnecessary fragmentation. .PD .PP .I Srvfs invokes .I exportprog (default .BR /bin/exportfs ) to create a mountable file system from a name space and posts it at .BI /srv/ name , which is created with mode .I perm (default 0600). The name space is the directory tree rooted at .IR path . The .BR -d , .BR -P , and .B -R options, if present, are relayed to .IR exportprog . .SH EXAMPLES To export the archive of one user for one month, except for secrets, .IP .EX cd /n/dump echo '+ ^/(2003(/10..(/usr(/glenda/?)?)?)?)?' > /tmp/pattern echo '- \e.(aes|pgp)$' >> /tmp/pattern exportfs -P /tmp/pattern .EE .LP Use .I srvfs to enable mounting of an FTP file system (see .IR ftpfs (4)) in several windows, or to publish a .B /proc (see .IR proc (3)) with a broken process so a remote person may debug the program: .IP .EX srvfs ftp /n/ftp srvfs broke /mnt/term/proc .EE .LP Use .I srvfs to obtain a copy of a service to be manipulated directly by a user program like .IR nfsserver (8): .IP .EX srvfs nfs.boot /srv/boot aux/nfsserver -f /srv/nfs.boot .EE .LP Use .I srvfs to spy on all accesses to a particular subtree: .IP .EX srvfs -d spy / tail -f /tmp/exportdb & mount /srv/spy /n/spy cd /n/spy; ls .EE .SH SOURCE .B /sys/src/cmd/exportfs .br .B /sys/src/cmd/srvfs.c .SH SEE ALSO .IR rcpu (1)