Commit Graph

7 Commits

Author SHA1 Message Date
Rick Macklem
7cfce7cec7 hrs@ reported a panic to freebsd-stable@ under the subject line
"panic in 8.3-PRERELEASE" on Feb. 22, 2012. This panic was caused
by use of a mix of tsleep() and msleep() calls on the same event
in the new NFS server DRC code. It did "mtx_unlock(); tsleep();"
in two places, which kib@ noted introduced a slight risk that the
wakeup() would occur before the tsleep(), resulting in a 10sec
delay before waking up. This patch fixes the problem by replacing
"mtx_unlock(); tsleep();" with mtx_sleep(..PDROP..). It also
changes a nfsmsleep() call to mtx_sleep() so that the code uses
mtx_sleep() consistently within the file.

Tested by:	hrs (in progress)
Reviewed by:	jhb
MFC after:	5 days
2012-02-23 16:47:05 +00:00
Zack Kirsch
a9285ae5c4 Add DEXITCODE plumbing to NFS.
Isilon has the concept of an in-memory exit-code ring that saves the last exit
code of a function and allows for stack tracing. This is very helpful when
debugging tough issues.

This patch is essentially a no-op for BSD at this point, until we upstream
the dexitcode logic itself. The patch adds DEXITCODE calls to every NFS
function that returns an errno error code. A number of code paths were also
reorganized to have single exit paths, to reduce code duplication.

Submitted by:   David Kwan <dkwan@isilon.com>
Reviewed by:    rmacklem
Approved by:    zml (mentor)
MFC after:      2 weeks
2011-07-16 08:51:09 +00:00
Rick Macklem
4e22c98a39 Fix a number of places where the new NFS server did not
lock the mutex when manipulating rc_flag in the DRC cache.
This is believed to fix a hung server that was reported
to the freebsd-fs@ list on June 9 under the subject heading
"New NFS server stress test hang", where all the threads
were waiting for the RC_LOCKED flag to clear.

Tested by:	jwd at slowblink.com
MFC after:	2 weeks
2011-06-19 23:54:01 +00:00
Zack Kirsch
52776c502b Clean up the experimental NFS server replay cache when the module is unloaded.
Reviewed by:    rmacklem
Approved by:    zml (mentor)
2011-01-12 23:34:09 +00:00
Rick Macklem
d5ad662523 This fixes the experimental NFS server so that it won't crash in the
caching code for IPv6 by fixing a typo that used the incorrect variable.
It also fixes the indentation of the statement above it.

Reported by:	simon AT comsys.ntu-kpi.kiev.ua
MFC after:	5 days
2010-02-13 23:56:19 +00:00
Xin LI
d9cf8753e3 Allow using IPv6 in nfsrvd_sentcache() callback.
PR:		kern/141289
Submitted by:	Petr Lampa <lampa fit vutbr cz>
Approved by:	rmacklem
MFC after:	1 week
2009-12-08 23:43:50 +00:00
Rick Macklem
9ec7b004d0 Add the experimental nfs subtree to the kernel, that includes
support for NFSv4 as well as NFSv2 and 3.
	It lives in 3 subdirs under sys/fs:
	nfs - functions that are common to the client and server
	nfsclient - a mutation of sys/nfsclient that call generic functions
	to do RPCs and handle state. As such, it retains the
	buffer cache handling characteristics and vnode semantics that
	are found in sys/nfsclient, for the most part.
	nfsserver - the server. It includes a DRC designed specifically for
	NFSv4, that is used instead of the generic DRC in sys/rpc.
	The build glue will be checked in later, so at this point, it
	consists of 3 new subdirs that should not affect kernel building.

Approved by:	kib (mentor)
2009-05-04 15:23:58 +00:00