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Add an assertion that nfssvc() isn't called with Giant.

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Add two additional pairs of assertions, one at the end of the NFS
server event loop, and one one exit from the NFS daemon, that
assert that if debug.mpsafenet is enabled, Giant is not held, and
that if it is not enabled, Giant will be held.  This is intended
to support debugging scenarios where Giant is "leaked" during NFS
processing.
This commit is contained in:
Robert Watson 2004-05-31 16:32:49 +00:00
parent 4f16b8b190
commit 4fa649df8e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=129894
1 changed files with 10 additions and 0 deletions
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10
sys/nfsserver/nfs_syscalls.c
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@ -134,6 +134,8 @@ nfssvc(struct thread *td, struct nfssvc_args *uap)
struct nfsd_args nfsdarg;
int error;
KASSERT(!mtx_owned(&Giant), ("nfssvc(): called with Giant"));
#ifdef MAC
error = mac_check_system_nfsd(td->td_ucred);
if (error)
@ -550,8 +552,16 @@ nfssvc_nfsd(struct thread *td)
nfsd->nfsd_slp = NULL;
nfsrv_slpderef(slp);
}
KASSERT(!(debug_mpsafenet == 0 && !mtx_owned(&Giant)),
("nfssvc_nfsd(): debug.mpsafenet=0 && !Giant"));
KASSERT(!(debug_mpsafenet == 1 && mtx_owned(&Giant)),
("nfssvc_nfsd(): debug.mpsafenet=1 && Giant"));
}
done:
KASSERT(!(debug_mpsafenet == 0 && !mtx_owned(&Giant)),
("nfssvc_nfsd(): debug.mpsafenet=0 && !Giant"));
KASSERT(!(debug_mpsafenet == 1 && mtx_owned(&Giant)),
("nfssvc_nfsd(): debug.mpsafenet=1 && Giant"));
TAILQ_REMOVE(&nfsd_head, nfsd, nfsd_chain);
splx(s);
free((caddr_t)nfsd, M_NFSD);