FBSD7: Don't sleep with the glock

On FreeBSD 7.X, vinvalbuf() can (will) sleep; this results in a panic
when the kernel is configured with WITNESS and we hold the glock around
it.
Drop the glock in this case.

Change-Id: I0036aad3059805d77afe9aa9bf7f5d421d6810f8
Reviewed-on: http://gerrit.openafs.org/3551
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>

diff --git a/src/afs/afs_vcache.c b/src/afs/afs_vcache.c
index 26ed2c2..8502d6a 100644 (file)
--- a/src/afs/afs_vcache.c
+++ b/src/afs/afs_vcache.c
@@ -1646,7 +1646,9 @@ afs_GetVCache(struct VenusFid *afid, struct vrequest *areq,
        iheldthelock = VOP_ISLOCKED(vp, curthread);
        if (!iheldthelock)
            vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, curthread);
+       AFS_GUNLOCK();
        vinvalbuf(vp, V_SAVE, curthread, PINOD, 0);
+       AFS_GLOCK();
        if (!iheldthelock)
            VOP_UNLOCK(vp, LK_EXCLUSIVE, curthread);
 #elif defined(AFS_FBSD_ENV)