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authorRick Macklem <rmacklem@FreeBSD.org>2021-04-25 19:52:48 +0000
committerRick Macklem <rmacklem@FreeBSD.org>2021-04-25 19:55:00 +0000
commit02695ea8909d818ceaa726f90f889889dfd39fac (patch)
tree4f2e8300478eea8767af3696e7ca1e3bd280cf32
parent7d222ce3c10bdc23c8dc92d6b13e376ede5840d5 (diff)
downloadsrc-02695ea8909d818ceaa726f90f889889dfd39fac.tar.gz
src-02695ea8909d818ceaa726f90f889889dfd39fac.zip
nfscl: fix delegation recall when the file is not open
Without this patch, if a NFSv4 server recalled a delegation when the file is not open, the renew thread would block in the NFS VOP_INACTIVE() trying to acquire the client state lock that it already holds. This patch fixes the problem by delaying the vrele() call until after the client state lock is released. This bug has been in the NFSv4 client for a long time, but since it only affects delegation when recalled due to another client opening the file, it got missed during previous testing. Until you have this patch in your client, you should avoid the use of delegations. MFC after: 2 weeks
-rw-r--r--sys/fs/nfsclient/nfs_clstate.c53
1 files changed, 30 insertions, 23 deletions
diff --git a/sys/fs/nfsclient/nfs_clstate.c b/sys/fs/nfsclient/nfs_clstate.c
index e310deff6cf9..6cff58331c97 100644
--- a/sys/fs/nfsclient/nfs_clstate.c
+++ b/sys/fs/nfsclient/nfs_clstate.c
@@ -156,7 +156,8 @@ static void nfscl_freedeleg(struct nfscldeleghead *, struct nfscldeleg *);
static int nfscl_errmap(struct nfsrv_descript *, u_int32_t);
static void nfscl_cleanup_common(struct nfsclclient *, u_int8_t *);
static int nfscl_recalldeleg(struct nfsclclient *, struct nfsmount *,
- struct nfscldeleg *, vnode_t, struct ucred *, NFSPROC_T *, int);
+ struct nfscldeleg *, vnode_t, struct ucred *, NFSPROC_T *, int,
+ vnode_t *);
static void nfscl_freeopenowner(struct nfsclowner *, int);
static void nfscl_cleandeleg(struct nfscldeleg *);
static int nfscl_trydelegreturn(struct nfscldeleg *, struct ucred *,
@@ -2562,6 +2563,7 @@ nfscl_renewthread(struct nfsclclient *clp, NFSPROC_T *p)
struct nfsclds *dsp;
bool retok;
struct mount *mp;
+ vnode_t vp;
cred = newnfs_getcred();
NFSLOCKCLSTATE();
@@ -2683,7 +2685,7 @@ tryagain:
NFSUNLOCKCLSTATE();
newnfs_copycred(&dp->nfsdl_cred, cred);
ret = nfscl_recalldeleg(clp, clp->nfsc_nmp, dp,
- NULL, cred, p, 1);
+ NULL, cred, p, 1, &vp);
if (!ret) {
nfscl_cleandeleg(dp);
TAILQ_REMOVE(&clp->nfsc_deleg, dp,
@@ -2694,6 +2696,22 @@ tryagain:
nfsstatsv1.cldelegates--;
}
NFSLOCKCLSTATE();
+ /*
+ * The nfsc_lock must be released before doing
+ * vrele(), since it might call nfs_inactive().
+ * For the unlikely case where the vnode failed
+ * to be acquired by nfscl_recalldeleg(), a
+ * VOP_RECLAIM() should be in progress and it
+ * will return the delegation.
+ */
+ nfsv4_unlock(&clp->nfsc_lock, 0);
+ igotlock = 0;
+ if (vp != NULL) {
+ NFSUNLOCKCLSTATE();
+ vrele(vp);
+ NFSLOCKCLSTATE();
+ }
+ goto tryagain;
}
dp = ndp;
}
@@ -3943,16 +3961,18 @@ nfscl_lockt(vnode_t vp, struct nfsclclient *clp, u_int64_t off,
static int
nfscl_recalldeleg(struct nfsclclient *clp, struct nfsmount *nmp,
struct nfscldeleg *dp, vnode_t vp, struct ucred *cred, NFSPROC_T *p,
- int called_from_renewthread)
+ int called_from_renewthread, vnode_t *vpp)
{
struct nfsclowner *owp, *lowp, *nowp;
struct nfsclopen *op, *lop;
struct nfscllockowner *lp;
struct nfscllock *lckp;
struct nfsnode *np;
- int error = 0, ret, gotvp = 0;
+ int error = 0, ret;
if (vp == NULL) {
+ KASSERT(vpp != NULL, ("nfscl_recalldeleg: vpp NULL"));
+ *vpp = NULL;
/*
* First, get a vnode for the file. This is needed to do RPCs.
*/
@@ -3966,7 +3986,7 @@ nfscl_recalldeleg(struct nfsclclient *clp, struct nfsmount *nmp,
return (0);
}
vp = NFSTOV(np);
- gotvp = 1;
+ *vpp = vp;
} else {
np = VTONFS(vp);
}
@@ -3993,8 +4013,6 @@ nfscl_recalldeleg(struct nfsclclient *clp, struct nfsmount *nmp,
* return now, so that the dirty buffer will be flushed
* later.
*/
- if (gotvp != 0)
- vrele(vp);
return (ret);
}
@@ -4018,11 +4036,8 @@ nfscl_recalldeleg(struct nfsclclient *clp, struct nfsmount *nmp,
owp, dp, cred, p);
if (ret == NFSERR_STALECLIENTID ||
ret == NFSERR_STALEDONTRECOVER ||
- ret == NFSERR_BADSESSION) {
- if (gotvp)
- vrele(vp);
+ ret == NFSERR_BADSESSION)
return (ret);
- }
if (ret) {
nfscl_freeopen(lop, 1);
if (!error)
@@ -4050,11 +4065,8 @@ nfscl_recalldeleg(struct nfsclclient *clp, struct nfsmount *nmp,
nfscl_freeopenowner(owp, 0);
if (ret == NFSERR_STALECLIENTID ||
ret == NFSERR_STALEDONTRECOVER ||
- ret == NFSERR_BADSESSION) {
- if (gotvp)
- vrele(vp);
+ ret == NFSERR_BADSESSION)
return (ret);
- }
if (ret) {
nfscl_freeopen(lop, 1);
if (!error)
@@ -4075,17 +4087,12 @@ nfscl_recalldeleg(struct nfsclclient *clp, struct nfsmount *nmp,
if (ret == NFSERR_STALESTATEID ||
ret == NFSERR_STALEDONTRECOVER ||
ret == NFSERR_STALECLIENTID ||
- ret == NFSERR_BADSESSION) {
- if (gotvp)
- vrele(vp);
+ ret == NFSERR_BADSESSION)
return (ret);
- }
if (ret && !error)
error = ret;
}
}
- if (gotvp)
- vrele(vp);
return (error);
}
@@ -4497,7 +4504,7 @@ nfscl_removedeleg(vnode_t vp, NFSPROC_T *p, nfsv4stateid_t *stp)
NFSUNLOCKCLSTATE();
cred = newnfs_getcred();
newnfs_copycred(&dp->nfsdl_cred, cred);
- (void) nfscl_recalldeleg(clp, nmp, dp, vp, cred, p, 0);
+ nfscl_recalldeleg(clp, nmp, dp, vp, cred, p, 0, NULL);
NFSFREECRED(cred);
triedrecall = 1;
NFSLOCKCLSTATE();
@@ -4596,7 +4603,7 @@ nfscl_renamedeleg(vnode_t fvp, nfsv4stateid_t *fstp, int *gotfdp, vnode_t tvp,
NFSUNLOCKCLSTATE();
cred = newnfs_getcred();
newnfs_copycred(&dp->nfsdl_cred, cred);
- (void) nfscl_recalldeleg(clp, nmp, dp, fvp, cred, p, 0);
+ nfscl_recalldeleg(clp, nmp, dp, fvp, cred, p, 0, NULL);
NFSFREECRED(cred);
triedrecall = 1;
NFSLOCKCLSTATE();