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MFC r197048:

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Add LK_NOWITNESS to the vn_lock() calls done on newly created nfs
vnodes, since these nodes are not linked into the mount queue and,
as such, the vn_lock() cannot cause a deadlock so LORs are harmless.

Suggested by: kib
Approved by:	re (kensmith), kib (mentor)
This commit is contained in:
Rick Macklem 2009-09-14 15:16:17 +00:00
parent 3f6296aa26
commit 8760cb9afb
3 changed files with 3 additions and 3 deletions
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2
sys/fs/nfsclient/nfs_clnode.c
View File

@ -157,7 +157,7 @@ ncl_nget(struct mount *mntp, u_int8_t *fhp, int fhsize, struct nfsnode **npp)
M_NFSFH, M_WAITOK);
bcopy(fhp, np->n_fhp->nfh_fh, fhsize);
np->n_fhp->nfh_len = fhsize;
lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL);
lockmgr(vp->v_vnlock, LK_EXCLUSIVE | LK_NOWITNESS, NULL);
error = insmntque(vp, mntp);
if (error != 0) {
*npp = NULL;

2
sys/fs/nfsclient/nfs_clport.c
View File

@ -232,7 +232,7 @@ nfscl_nget(struct mount *mntp, struct vnode *dvp, struct nfsfh *nfhp,
*/
VN_LOCK_AREC(vp);
VN_LOCK_ASHARE(vp);
lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL);
lockmgr(vp->v_vnlock, LK_EXCLUSIVE | LK_NOWITNESS, NULL);
error = insmntque(vp, mntp);
if (error != 0) {
*npp = NULL;

2
sys/nfsclient/nfs_node.c
View File

@ -158,7 +158,7 @@ nfs_nget(struct mount *mntp, nfsfh_t *fhp, int fhsize, struct nfsnode **npp, int
np->n_fhp = &np->n_fh;
bcopy((caddr_t)fhp, (caddr_t)np->n_fhp, fhsize);
np->n_fhsize = fhsize;
lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL);
lockmgr(vp->v_vnlock, LK_EXCLUSIVE | LK_NOWITNESS, NULL);
error = insmntque(vp, mntp);
if (error != 0) {
*npp = NULL;