aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorTrond Myklebust <trond.myklebust@primarydata.com>2014-03-04 13:12:03 -0500
committerTrond Myklebust <trond.myklebust@primarydata.com>2014-03-05 11:55:24 -0500
commit927864cd92aaad1d6285e3bb16e503caf3d6e27e (patch)
tree8fed892e6372e17d73a5b7c31083a63555b8d25b
parente1253be0ece1a95a02c7f5843194877471af8179 (diff)
downloadlinux-927864cd92aaad1d6285e3bb16e503caf3d6e27e.tar.gz
NFSv4: Fix the return value of nfs4_select_rw_stateid
In commit 5521abfdcf4d6 (NFSv4: Resend the READ/WRITE RPC call if a stateid change causes an error), we overloaded the return value of nfs4_select_rw_stateid() to cause it to return -EWOULDBLOCK if an RPC call is outstanding that would cause the NFSv4 lock or open stateid to change. That is all redundant when we actually copy the stateid used in the read/write RPC call that failed, and check that against the current stateid. It is doubly so, when we consider that in the NFSv4.1 case, we also set the stateid's seqid to the special value '0', which means 'match the current valid stateid'. Reported-by: Andy Adamson <andros@netapp.com> Link: http://lkml.kernel.org/r/1393954269-3974-1-git-send-email-andros@netapp.com Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
-rw-r--r--fs/nfs/nfs4state.c14
1 files changed, 3 insertions, 11 deletions
diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index e1a47217c05e..0deb32105ccf 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -974,9 +974,6 @@ static int nfs4_copy_lock_stateid(nfs4_stateid *dst,
else if (lsp != NULL && test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) {
nfs4_stateid_copy(dst, &lsp->ls_stateid);
ret = 0;
- smp_rmb();
- if (!list_empty(&lsp->ls_seqid.list))
- ret = -EWOULDBLOCK;
}
spin_unlock(&state->state_lock);
nfs4_put_lock_state(lsp);
@@ -984,10 +981,9 @@ out:
return ret;
}
-static int nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
+static void nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
{
const nfs4_stateid *src;
- int ret;
int seq;
do {
@@ -996,12 +992,7 @@ static int nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state)
if (test_bit(NFS_OPEN_STATE, &state->flags))
src = &state->open_stateid;
nfs4_stateid_copy(dst, src);
- ret = 0;
- smp_rmb();
- if (!list_empty(&state->owner->so_seqid.list))
- ret = -EWOULDBLOCK;
} while (read_seqretry(&state->seqlock, seq));
- return ret;
}
/*
@@ -1026,7 +1017,8 @@ int nfs4_select_rw_stateid(nfs4_stateid *dst, struct nfs4_state *state,
* choose to use.
*/
goto out;
- ret = nfs4_copy_open_stateid(dst, state);
+ nfs4_copy_open_stateid(dst, state);
+ ret = 0;
out:
if (nfs_server_capable(state->inode, NFS_CAP_STATEID_NFSV41))
dst->seqid = 0;