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VOP_ISLOCKED() should not be used to determine if the vnode is locked.

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Explicitely track the locked status of the vnode.

Reviewed by:	pjd
Tested by:	avg
MFC after:	1 week
This commit is contained in:
Konstantin Belousov 2010-12-15 12:46:53 +00:00
parent 03ee10d8e4
commit 607ccc8676
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=216454
1 changed files with 11 additions and 2 deletions
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13
sys/nfsserver/nfs_serv.c
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@ -3037,6 +3037,7 @@ nfsrv_readdirplus(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
struct vattr va, at, *vap = &va;
struct nfs_fattr *fp;
int len, nlen, rem, xfer, tsiz, i, error = 0, error1, getret = 1;
int vp_locked;
int siz, cnt, fullsiz, eofflag, rdonly, dirlen, ncookies;
u_quad_t off, toff, verf;
u_long *cookies = NULL, *cookiep; /* needs to be int64_t or off_t */
@ -3067,10 +3068,12 @@ nfsrv_readdirplus(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
fullsiz = siz;
error = nfsrv_fhtovp(fhp, 1, &vp, &vfslocked, nfsd, slp,
nam, &rdonly, TRUE);
vp_locked = 1;
if (!error && vp->v_type != VDIR) {
error = ENOTDIR;
vput(vp);
vp = NULL;
vp_locked = 0;
}
if (error) {
nfsm_reply(NFSX_UNSIGNED);
@ -3090,6 +3093,7 @@ nfsrv_readdirplus(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
error = nfsrv_access(vp, VEXEC, cred, rdonly, 0);
if (error) {
vput(vp);
vp_locked = 0;
vp = NULL;
nfsm_reply(NFSX_V3POSTOPATTR);
nfsm_srvpostop_attr(getret, &at);
@ -3097,6 +3101,7 @@ nfsrv_readdirplus(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
goto nfsmout;
}
VOP_UNLOCK(vp, 0);
vp_locked = 0;
rbuf = malloc(siz, M_TEMP, M_WAITOK);
again:
iv.iov_base = rbuf;
@ -3110,6 +3115,7 @@ nfsrv_readdirplus(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
io.uio_td = NULL;
eofflag = 0;
vn_lock(vp, LK_SHARED | LK_RETRY);
vp_locked = 1;
if (cookies) {
free((caddr_t)cookies, M_TEMP);
cookies = NULL;
@ -3118,6 +3124,7 @@ nfsrv_readdirplus(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
off = (u_quad_t)io.uio_offset;
getret = VOP_GETATTR(vp, &at, cred);
VOP_UNLOCK(vp, 0);
vp_locked = 0;
if (!cookies && !error)
error = NFSERR_PERM;
if (!error)
@ -3238,8 +3245,10 @@ nfsrv_readdirplus(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
} else {
cn.cn_flags &= ~ISDOTDOT;
}
if (!VOP_ISLOCKED(vp))
if (!vp_locked) {
vn_lock(vp, LK_SHARED | LK_RETRY);
vp_locked = 1;
}
if ((vp->v_vflag & VV_ROOT) != 0 &&
(cn.cn_flags & ISDOTDOT) != 0) {
vref(vp);
@ -3342,7 +3351,7 @@ nfsrv_readdirplus(struct nfsrv_descript *nfsd, struct nfssvc_sock *slp,
cookiep++;
ncookies--;
}
if (!usevget && VOP_ISLOCKED(vp))
if (!usevget && vp_locked)
vput(vp);
else
vrele(vp);