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| author | Rick Macklem <rmacklem@FreeBSD.org> | 2021-11-05 22:33:19 +0000 |
|---|---|---|
| committer | Rick Macklem <rmacklem@FreeBSD.org> | 2021-11-05 22:33:19 +0000 |
| commit | f5d5164fb607ab9c51c52ace4ec241f6cac7cc5c (patch) | |
| tree | 3452e72899775d0ec832017c9bfe258252aef9b5 | |
| parent | e2157cd0000f6dbb6465d7a885f2dcfd4d3596cb (diff) | |
| download | src-f5d5164fb607ab9c51c52ace4ec241f6cac7cc5c.tar.gz src-f5d5164fb607ab9c51c52ace4ec241f6cac7cc5c.zip | |
nfscl: Fix two more cases for forced dismount
Although I was not able to cause a failure during testing, there
are places in nfscl_removedeleg() and nfscl_renamedeleg() where
I think a forced dismount could get hung. This patch fixes those.
This patch only affects forced dismount and only if the NFSv4
server is issuing delegations to the client.
Found by code inspection.
MFC after: 2 weeks
| -rw-r--r-- | sys/fs/nfsclient/nfs_clstate.c | 54 |
1 files changed, 46 insertions, 8 deletions
diff --git a/sys/fs/nfsclient/nfs_clstate.c b/sys/fs/nfsclient/nfs_clstate.c index 42233ea7cf9d..1df8530d0e39 100644 --- a/sys/fs/nfsclient/nfs_clstate.c +++ b/sys/fs/nfsclient/nfs_clstate.c @@ -4669,6 +4669,7 @@ nfscl_removedeleg(vnode_t vp, NFSPROC_T *p, nfsv4stateid_t *stp) struct nfsclowner *owp; struct nfscllockowner *lp; struct nfsmount *nmp; + struct mount *mp; struct ucred *cred; struct nfsnode *np; int igotlock = 0, triedrecall = 0, needsrecall, retcnt = 0, islept; @@ -4683,6 +4684,7 @@ nfscl_removedeleg(vnode_t vp, NFSPROC_T *p, nfsv4stateid_t *stp) } NFSUNLOCKMNT(nmp); np = VTONFS(vp); + mp = nmp->nm_mountp; NFSLOCKCLSTATE(); /* * Loop around waiting for: @@ -4709,8 +4711,13 @@ nfscl_removedeleg(vnode_t vp, NFSPROC_T *p, nfsv4stateid_t *stp) igotlock = 0; } dp->nfsdl_rwlock.nfslock_lock |= NFSV4LOCK_WANTED; - (void) nfsmsleep(&dp->nfsdl_rwlock, - NFSCLSTATEMUTEXPTR, PZERO, "nfscld", NULL); + msleep(&dp->nfsdl_rwlock, NFSCLSTATEMUTEXPTR, PZERO, + "nfscld", hz); + if (NFSCL_FORCEDISM(mp)) { + dp->nfsdl_flags &= ~NFSCLDL_DELEGRET; + NFSUNLOCKCLSTATE(); + return (0); + } continue; } needsrecall = 0; @@ -4733,7 +4740,14 @@ nfscl_removedeleg(vnode_t vp, NFSPROC_T *p, nfsv4stateid_t *stp) islept = 0; while (!igotlock) { igotlock = nfsv4_lock(&clp->nfsc_lock, 1, - &islept, NFSCLSTATEMUTEXPTR, NULL); + &islept, NFSCLSTATEMUTEXPTR, mp); + if (NFSCL_FORCEDISM(mp)) { + dp->nfsdl_flags &= ~NFSCLDL_DELEGRET; + if (igotlock) + nfsv4_unlock(&clp->nfsc_lock, 0); + NFSUNLOCKCLSTATE(); + return (0); + } if (islept) break; } @@ -4774,6 +4788,7 @@ nfscl_renamedeleg(vnode_t fvp, nfsv4stateid_t *fstp, int *gotfdp, vnode_t tvp, struct nfsclowner *owp; struct nfscllockowner *lp; struct nfsmount *nmp; + struct mount *mp; struct ucred *cred; struct nfsnode *np; int igotlock = 0, triedrecall = 0, needsrecall, retcnt = 0, islept; @@ -4789,6 +4804,7 @@ nfscl_renamedeleg(vnode_t fvp, nfsv4stateid_t *fstp, int *gotfdp, vnode_t tvp, return (retcnt); } NFSUNLOCKMNT(nmp); + mp = nmp->nm_mountp; NFSLOCKCLSTATE(); /* * Loop around waiting for: @@ -4816,8 +4832,15 @@ nfscl_renamedeleg(vnode_t fvp, nfsv4stateid_t *fstp, int *gotfdp, vnode_t tvp, igotlock = 0; } dp->nfsdl_rwlock.nfslock_lock |= NFSV4LOCK_WANTED; - (void) nfsmsleep(&dp->nfsdl_rwlock, - NFSCLSTATEMUTEXPTR, PZERO, "nfscld", NULL); + msleep(&dp->nfsdl_rwlock, NFSCLSTATEMUTEXPTR, PZERO, + "nfscld", hz); + if (NFSCL_FORCEDISM(mp)) { + dp->nfsdl_flags &= ~NFSCLDL_DELEGRET; + NFSUNLOCKCLSTATE(); + *gotfdp = 0; + *gottdp = 0; + return (0); + } continue; } needsrecall = 0; @@ -4840,7 +4863,16 @@ nfscl_renamedeleg(vnode_t fvp, nfsv4stateid_t *fstp, int *gotfdp, vnode_t tvp, islept = 0; while (!igotlock) { igotlock = nfsv4_lock(&clp->nfsc_lock, 1, - &islept, NFSCLSTATEMUTEXPTR, NULL); + &islept, NFSCLSTATEMUTEXPTR, mp); + if (NFSCL_FORCEDISM(mp)) { + dp->nfsdl_flags &= ~NFSCLDL_DELEGRET; + if (igotlock) + nfsv4_unlock(&clp->nfsc_lock, 0); + NFSUNLOCKCLSTATE(); + *gotfdp = 0; + *gottdp = 0; + return (0); + } if (islept) break; } @@ -4877,8 +4909,14 @@ nfscl_renamedeleg(vnode_t fvp, nfsv4stateid_t *fstp, int *gotfdp, vnode_t tvp, */ if (dp->nfsdl_rwlock.nfslock_usecnt > 0) { dp->nfsdl_rwlock.nfslock_lock |= NFSV4LOCK_WANTED; - (void) nfsmsleep(&dp->nfsdl_rwlock, - NFSCLSTATEMUTEXPTR, PZERO, "nfscld", NULL); + msleep(&dp->nfsdl_rwlock, NFSCLSTATEMUTEXPTR, PZERO, + "nfscld", hz); + if (NFSCL_FORCEDISM(mp)) { + NFSUNLOCKCLSTATE(); + *gotfdp = 0; + *gottdp = 0; + return (0); + } continue; } LIST_FOREACH(owp, &dp->nfsdl_owner, nfsow_list) { |