Date: Sun, 31 Jan 2010 00:55:21 +0200 From: Mikolaj Golub <to.my.trociny@gmail.com> To: Alan Aldrich <aaldrich@ihouseweb.com> Cc: freebsd-net@freebsd.org Subject: Re: NFS mount properties Message-ID: <86wryzurs6.fsf@kopusha.onet> In-Reply-To: <C8C37242-1FE0-46F4-B66B-BDAF8995FED0@ihouseweb.com> (Alan Aldrich's message of "Thu\, 28 Jan 2010 08\:46\:33 -0800") References: <C8C37242-1FE0-46F4-B66B-BDAF8995FED0@ihouseweb.com>
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On Thu, 28 Jan 2010 08:46:33 -0800 Alan Aldrich wrote:
> I am trying to determine how to examine the actual properties of an
> nfs mount in FreeBSD
> In CentOS one can 'cat /proc/mounts' to determine all of the mount
> properties.
> Specifically I am trying to confirm whether the mount is using TCP or
> UDP as I want it to
> be TCP . Is there some similar way to tell in FreeBSD?
>
> My fstab entry says this
> 192.168.44.55:/mcp/home /net nfs rw,async,-d,-3,-s,-i,noatime,-
> T 0 0
> It mounts fine,
> but I want to confirm that it is actually mounting with TCP and not
> UDP and cannot figure out
> what tool will tell me this.
>
> 'mount' tells me this
> 192.168.44.55:/mcp/home on /net (nfs, asynchronous, noatime)
>
> but not whether it is mounted TCP or UDP
If it is mounted with TCP u UDP you can find out with netstat, checking tcp
connections to 2049 port. If you see established connections like below
tcp4 0 0 10.0.0.110.895 10.0.100.2.2049 ESTABLISHED
then tcp is used. Certainly if you have several mounts on the same ip it
complicates the situation :-)
I don't know any such tools that would report this info and would glad to hear
about them, but if I really needed this info I could use the universal tool --
kgdb :-)
zhuzha:~% sudo kgdb
(kgdb) set print pretty
(kgdb) p *mountlist.tqh_first.mnt_list.tqe_next.mnt_list.tqe_next.mnt_list.tqe_next.mnt_list.tqe_next.mnt_list.tqe_next.mnt_list.tqe_next
$26 = {
...
mnt_list = {
tqe_next = 0xc5e9a78c,
tqe_prev = 0xc5e9acac
},
...
mnt_opt = 0xc61f7760,
...
mnt_stat = {
f_version = 537068824,
f_type = 4,
f_flags = 0,
f_bsize = 512,
f_iosize = 32768,
f_blocks = 284354052,
f_bfree = 137997300,
f_bavail = 115248976,
f_files = 18394110,
f_ffree = 16921938,
f_syncwrites = 0,
f_asyncwrites = 0,
f_syncreads = 0,
f_asyncreads = 0,
f_spare = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
f_namemax = 255,
f_owner = 0,
f_fsid = {
val = {67174148, 4}
},
f_charspare = '\0' <repeats 79 times>,
f_fstypename = "nfs", '\0' <repeats 12 times>,
f_mntfromname = "srv01.ua1:/var/public\000\004(\000\000\000\000\000\214\004\b\003\000\000\000\003\000\000\000P\000\000\000X\002\000\000\200»\000\000\000ÐBÆ\000\000\000\000 \a \aÀ\a7Æ \a7ÆÀx\037Æ°x\037Æ\004\000\000\000\v\000\000",
f_mntonname = "/mnt/0", '\0' <repeats 81 times>
},
...
}
(kgdb) p *mountlist.tqh_first.mnt_list.tqe_next.mnt_list.tqe_next.mnt_list.tqe_next.mnt_list.tqe_next.mnt_list.tqe_next.mnt_list.tqe_next.mnt_opt.tqh_first
$27 = {
link = {
tqe_next = 0xc6370560,
tqe_prev = 0xc61f7760
},
name = 0xc61f7770 "rw",
value = 0xc61f7780,
len = 1,
pos = 0,
seen = 0
}
(kgdb) p *mountlist.tqh_first.mnt_list.tqe_next.mnt_list.tqe_next.mnt_list.tqe_next.mnt_list.tqe_next.mnt_list.tqe_next.mnt_list.tqe_next.mnt_opt.tqh_first.link.tqe_next
$28 = {
link = {
tqe_next = 0xc6370580,
tqe_prev = 0xc6370520
},
name = 0xc61f77a0 "soft",
value = 0xc61f77b0,
len = 1,
pos = 1,
seen = 1
}
(kgdb) p *mountlist.tqh_first.mnt_list.tqe_next.mnt_list.tqe_next.mnt_list.tqe_next.mnt_list.tqe_next.mnt_list.tqe_next.mnt_list.tqe_next.mnt_opt.tqh_first.link.tqe_next.link.tqe_next
$29 = {
link = {
tqe_next = 0xc63705a0,
tqe_prev = 0xc6370560
},
name = 0xc61f77c0 "intr",
value = 0xc61f7810,
len = 1,
pos = 2,
seen = 1
}
(kgdb) p *mountlist.tqh_first.mnt_list.tqe_next.mnt_list.tqe_next.mnt_list.tqe_next.mnt_list.tqe_next.mnt_list.tqe_next.mnt_list.tqe_next.mnt_opt.tqh_first.link.tqe_next.link.tqe_next.link.tqe_next
$30 = {
link = {
tqe_next = 0xc63705e0,
tqe_prev = 0xc6370580
},
name = 0xc61f77d0 "rsize",
value = 0xc61f77e0,
len = 6,
pos = 3,
seen = 1
}
(kgdb) p *mountlist.tqh_first.mnt_list.tqe_next.mnt_list.tqe_next.mnt_list.tqe_next.mnt_list.tqe_next.mnt_list.tqe_next.mnt_list.tqe_next.mnt_opt.tqh_first.link.tqe_next.link.tqe_next.link.tqe_next.link.tqe_next
$31 = {
link = {
tqe_next = 0xc6370620,
tqe_prev = 0xc63705a0
},
name = 0xc61f77f0 "wsize",
value = 0xc61f7800,
len = 6,
pos = 4,
seen = 1
}
(kgdb) p *mountlist.tqh_first.mnt_list.tqe_next.mnt_list.tqe_next.mnt_list.tqe_next.mnt_list.tqe_next.mnt_list.tqe_next.mnt_list.tqe_next.mnt_opt.tqh_first.link.tqe_next.link.tqe_next.link.tqe_next.link.tqe_next.link.tqe_next
$32 = {
link = {
tqe_next = 0xc6370640,
tqe_prev = 0xc63705e0
},
name = 0xc61f7820 "tcp",
value = 0xc61f7830,
len = 1,
pos = 5,
seen = 1
}
If I needed to do this frequently I would write a gdb script taking as an
example nice scripts from jhb :-)
http://people.freebsd.org/~jhb/gdb/
--
Mikolaj Golub
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