2017-08-09 01:40:42

by Trond Myklebust

Subject: [PATCH 1/2] NFSv4: Use correct inode in _nfs4_opendata_to_nfs4_state()

When doing open by filehandle we don't really want to lookup a new inode,
but rather update the one we've got. Add a helper which does this for us.

Signed-off-by: Trond Myklebust <[email protected]>
---
fs/nfs/nfs4proc.c | 28 +++++++++++++++++++++++-----
1 file changed, 23 insertions(+), 5 deletions(-)

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 1c73aa92b079..71c469bd1ae9 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -1659,6 +1659,28 @@ _nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
return state;
}

+static struct inode *
+nfs4_opendata_get_inode(struct nfs4_opendata *data)
+{
+ struct inode *inode;
+
+ switch (data->o_arg.claim) {
+ case NFS4_OPEN_CLAIM_NULL:
+ case NFS4_OPEN_CLAIM_DELEGATE_CUR:
+ case NFS4_OPEN_CLAIM_DELEGATE_PREV:
+ if (!(data->f_attr.valid & NFS_ATTR_FATTR))
+ return ERR_PTR(-EAGAIN);
+ inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh,
+ &data->f_attr, data->f_label);
+ break;
+ default:
+ inode = d_inode(data->dentry);
+ ihold(inode);
+ nfs_refresh_inode(inode, &data->f_attr);
+ }
+ return inode;
+}
+
static struct nfs4_state *
_nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
{
@@ -1672,10 +1694,7 @@ _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
goto out;
}

- ret = -EAGAIN;
- if (!(data->f_attr.valid & NFS_ATTR_FATTR))
- goto err;
- inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh, &data->f_attr, data->f_label);
+ inode = nfs4_opendata_get_inode(data);
ret = PTR_ERR(inode);
if (IS_ERR(inode))
goto err;
@@ -2071,7 +2090,6 @@ static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
case NFS4_OPEN_CLAIM_FH:
task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
- nfs_copy_fh(&data->o_res.fh, data->o_arg.fh);
}
data->timestamp = jiffies;
if (nfs4_setup_sequence(data->o_arg.server->nfs_client,
--
2.13.4

2017-08-09 01:40:43

by Trond Myklebust

Subject: [PATCH 2/2] NFSv4: Use the nfs4_state being recovered in _nfs4_opendata_to_nfs4_state()

If we're recovering a nfs4_state, then we should try to use that instead
of looking up a new stateid. Only do that if the inodes match, though.

Signed-off-by: Trond Myklebust <[email protected]>
---
fs/nfs/nfs4proc.c | 41 +++++++++++++++++++++++++----------------
1 file changed, 25 insertions(+), 16 deletions(-)

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 71c469bd1ae9..08cc97488904 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -1682,11 +1682,29 @@ nfs4_opendata_get_inode(struct nfs4_opendata *data)
}

static struct nfs4_state *
-_nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
+nfs4_opendata_find_nfs4_state(struct nfs4_opendata *data)
{
+ struct nfs4_state *state;
struct inode *inode;
- struct nfs4_state *state = NULL;
- int ret;
+
+ inode = nfs4_opendata_get_inode(data);
+ if (IS_ERR(inode))
+ return ERR_CAST(inode);
+ if (data->state != NULL && data->state->inode == inode) {
+ state = data->state;
+ atomic_inc(&state->count);
+ } else
+ state = nfs4_get_open_state(inode, data->owner);
+ iput(inode);
+ if (state == NULL)
+ state = ERR_PTR(-ENOMEM);
+ return state;
+}
+
+static struct nfs4_state *
+_nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
+{
+ struct nfs4_state *state;

if (!data->rpc_done) {
state = nfs4_try_open_cached(data);
@@ -1694,26 +1712,17 @@ _nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
goto out;
}

- inode = nfs4_opendata_get_inode(data);
- ret = PTR_ERR(inode);
- if (IS_ERR(inode))
- goto err;
- ret = -ENOMEM;
- state = nfs4_get_open_state(inode, data->owner);
- if (state == NULL)
- goto err_put_inode;
+ state = nfs4_opendata_find_nfs4_state(data);
+ if (IS_ERR(state))
+ goto out;
+
if (data->o_res.delegation_type != 0)
nfs4_opendata_check_deleg(data, state);
update_open_stateid(state, &data->o_res.stateid, NULL,
data->o_arg.fmode);
- iput(inode);
out:
nfs_release_seqid(data->o_arg.seqid);
return state;
-err_put_inode:
- iput(inode);
-err:
- return ERR_PTR(ret);
}

static struct nfs4_state *
--
2.13.4