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authorTrond Myklebust <trond.myklebust@primarydata.com>2015-09-20 10:50:17 -0400
committerTrond Myklebust <trond.myklebust@primarydata.com>2015-09-20 22:34:16 -0400
commit24311f884189d42d40354a6f38ca218eb9aeb811 (patch)
tree298a5debe9cfe0397ce289f10e6bf533fe5f8df4 /fs/nfs/delegation.c
parent8714d46dc5b95a6a898ec8f1e67237c7995adfc6 (diff)
downloadlinux-24311f884189d42d40354a6f38ca218eb9aeb811.tar.bz2
NFSv4: Recovery of recalled read delegations is broken
When a read delegation is being recalled, and we're reclaiming the cached opens, we need to make sure that we only reclaim read-only modes. A previous attempt to do this, relied on retrieving the delegation type from the nfs4_opendata structure. Unfortunately, as Kinglong pointed out, this field can only be set when performing reboot recovery. Furthermore, if we call nfs4_open_recover(), then we end up clobbering the state->flags for all modes that we're not recovering... The fix is to have the delegation recall code pass this information to the recovery call, and then refactor the recovery code so that nfs4_open_delegation_recall() does not need to call nfs4_open_recover(). Reported-by: Kinglong Mee <kinglongmee@gmail.com> Fixes: 39f897fdbd46 ("NFSv4: When returning a delegation, don't...") Tested-by: Kinglong Mee <kinglongmee@gmail.com> Cc: NeilBrown <neilb@suse.com> Cc: stable@vger.kernel.org # v4.2+ Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Diffstat (limited to 'fs/nfs/delegation.c')
-rw-r--r--fs/nfs/delegation.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/fs/nfs/delegation.c b/fs/nfs/delegation.c
index 2714ef835bdd..be806ead7f4d 100644
--- a/fs/nfs/delegation.c
+++ b/fs/nfs/delegation.c
@@ -113,7 +113,8 @@ out:
return status;
}
-static int nfs_delegation_claim_opens(struct inode *inode, const nfs4_stateid *stateid)
+static int nfs_delegation_claim_opens(struct inode *inode,
+ const nfs4_stateid *stateid, fmode_t type)
{
struct nfs_inode *nfsi = NFS_I(inode);
struct nfs_open_context *ctx;
@@ -140,7 +141,7 @@ again:
/* Block nfs4_proc_unlck */
mutex_lock(&sp->so_delegreturn_mutex);
seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
- err = nfs4_open_delegation_recall(ctx, state, stateid);
+ err = nfs4_open_delegation_recall(ctx, state, stateid, type);
if (!err)
err = nfs_delegation_claim_locks(ctx, state, stateid);
if (!err && read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
@@ -411,7 +412,8 @@ static int nfs_end_delegation_return(struct inode *inode, struct nfs_delegation
do {
if (test_bit(NFS_DELEGATION_REVOKED, &delegation->flags))
break;
- err = nfs_delegation_claim_opens(inode, &delegation->stateid);
+ err = nfs_delegation_claim_opens(inode, &delegation->stateid,
+ delegation->type);
if (!issync || err != -EAGAIN)
break;
/*