Author: pjd
Date: Tue Dec 21 23:15:40 2010
New Revision: 216633
URL: http://svn.freebsd.org/changeset/base/216633
Log:
Use newly added NFSRV_FLAG_BUSY flag for nfsrv_fhtovp() to keep mount point
busy. This fixes a race where we can pass invalid mount point to VFS_VGET()
via vp->v_mount when exported file system was forcibly unmounted between
nfsrv_fhtovp() and VFS_VGET().
Reviewed by: kib
MFC after: 5 days
Modified:
head/sys/nfsserver/nfs_serv.c
Modified: head/sys/nfsserver/nfs_serv.c
==============================================================================
--- head/sys/nfsserver/nfs_serv.c Tue Dec 21 23:12:45 2010
(r216632)
+++ head/sys/nfsserver/nfs_serv.c Tue Dec 21 23:15:40 2010
(r216633)
@@ -3036,9 +3036,11 @@ nfsrv_readdirplus(struct nfsrv_descript
int v3 = (nfsd->nd_flag & ND_NFSV3);
int usevget = 1, vfslocked;
struct componentname cn;
+ struct mount *mntp = NULL;
nfsdbprintf(("%s %d\n", __FILE__, __LINE__));
vfslocked = 0;
+ vp_locked = 0;
if (!v3)
panic("nfsrv_readdirplus: v3 proc called on a v2 connection");
fhp = &nfh.fh_generic;
@@ -3058,14 +3060,17 @@ nfsrv_readdirplus(struct nfsrv_descript
if (siz > xfer)
siz = xfer;
fullsiz = siz;
- error = nfsrv_fhtovp(fhp, 0, &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;
+ error = nfsrv_fhtovp(fhp, NFSRV_FLAG_BUSY, &vp, &vfslocked, nfsd, slp,
+ nam, &rdonly);
+ if (!error) {
+ vp_locked = 1;
+ mntp = vp->v_mount;
+ if (vp->v_type != VDIR) {
+ error = ENOTDIR;
+ vput(vp);
+ vp = NULL;
+ vp_locked = 0;
+ }
}
if (error) {
nfsm_reply(NFSX_UNSIGNED);
@@ -3207,8 +3212,8 @@ again:
* For readdir_and_lookup get the vnode using
* the file number.
*/
- error = VFS_VGET(vp->v_mount, dp->d_fileno,
- LK_SHARED, &nvp);
+ error = VFS_VGET(mntp, dp->d_fileno, LK_SHARED,
+ &nvp);
if (error != 0 && error != EOPNOTSUPP) {
error = 0;
goto invalid;
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