Hello, Steve Dickson. you wrote about "Re: what's the real meaning of fsid?" at 06:34:20 on 2008-12-18 : thank you for your attentions. and i did a retry. the results were listed below. > > >lioupayphone wrote: >> Hello, everyone. >> >> fsid in /etc/exports was used for identifying a file system. if a file system which exported 2 directories, it seems that we should tag the two export entries with same fsid. >> >> eg >> on one machine (server 10.10.37.147, Centos5.2 with linux2.6.18): >> >> #mkfs.ext3 /dev/sdc; mount /dev/sdc /mnt/;mkdir -p /mnt/dir1 /mnt/dir2; touch /mnt/dir1/wall-e /mnt/dir2/eva; >> #echo "/mnt/dir1 *(rw,async,root_squash,fsid=2)" > /etc/exports >> #echo "/mnt/dir2 *(rw,async,root_squash,fsid=2)" >> /etc/exports >> #service nfs start && exportfs -r >> >> on another machine (client 10.10.37.154): >> #mount 10.10.37.147:/mnt/dir1 /mnt/1/ && mount 10.10.37.147:/mnt/dir2 /mnt/2/ >> >> i am puzzled: on the client (10.10.37.154), i found both "/mnt/1/" and "/mnt/2/" have the same child ---- "wall-e". >> >> so i browsed the code of 2.6.18 and found: exp_export(), fs/nfsd/export.c . i have taged a comment on this code listed below. please give me some suggestions. thx. >I'm a bit puzzled by "both "/mnt/1/" and "/mnt/2/" have the same child". >Do mean they have the same file handle?? > >steved. > yes, both the two directories have a same FH. when i "cat /proc/fs/nfsd/exports ", it shows : # Version 1.1 # Path Client(Flags) # IPs /mnt/dir1 *(rw,root_squash,async,wdelay,no_subtree_check,fsid=2) /mnt/dir2 *(rw,root_squash,async,wdelay,no_subtree_check,fsid=2) and i "rpc.mountd -d all", and try do mount on client: mount -t nfs -o nolock 10.10.37.147:/mnt/dir1 /mnt/1/; mount -t nfs -o nolock 10.10.37.147:/mnt/dir2 /mnt/2/; the log on server (/var/log/messages) shows: Dec 18 09:06:37 nike mountd[21018]: MNT3(/mnt/dir1) called Dec 18 09:06:37 nike mountd[21018]: authenticated mount request from 10.10.37.154:981 for /mnt/dir1 (/mnt/dir1) Dec 18 09:06:43 nike mountd[21018]: MNT3(/mnt/dir1) called Dec 18 09:06:43 nike mountd[21018]: authenticated mount request from 10.10.37.154:983 for /mnt/dir1 (/mnt/dir1) Dec 18 09:06:43 nike mountd[21018]: nfsd_fh: inbuf '* 1 \x02000000' Dec 18 09:06:43 nike mountd[21018]: /mnt/dir1 and /mnt/dir2 have same filehandle for *, using first Dec 18 09:06:43 nike mountd[21018]: nfsd_fh: found 0x2ac56363a0b0 path /mnt/dir1 Dec 18 09:06:50 nike mountd[21018]: MNT3(/mnt/dir2) called Dec 18 09:06:50 nike mountd[21018]: authenticated mount request from 10.10.37.154:986 for /mnt/dir2 (/mnt/dir2) in kernel, /mnt/dir1 and /mnt/dir2 respectively corresponds to two different svc_export objects. in fh_compose(), they have same fsid_type and fsid, but the fileidtype and fileid should NOT be same. i am still in puzzled. :-( btw : "nike" is the hostname of server. :-) Best Regards! lioupayphone -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
