If the kernel cannot start the NFSv4 callback service during a mount
request, it returns -ENOMEM to user space, resulting in this message:
mount.nfs4: Cannot allocate memory
Adjust nfs_alloc_client() and nfs_get_client() to pass NFSv4 callback
start-up errors back to user space so a less mysterious error message
can be displayed by the mount command.
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
---
error_3 case fixed. Thanks for the review.
fs/nfs/client.c | 12 ++++++++----
1 files changed, 8 insertions(+), 4 deletions(-)
diff --git a/fs/nfs/client.c b/fs/nfs/client.c
index 75c9cd2..0e9a1f9 100644
--- a/fs/nfs/client.c
+++ b/fs/nfs/client.c
@@ -114,6 +114,7 @@ static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_
{
struct nfs_client *clp;
struct rpc_cred *cred;
+ int err = -ENOMEM;
if ((clp = kzalloc(sizeof(*clp), GFP_KERNEL)) == NULL)
goto error_0;
@@ -121,7 +122,8 @@ static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_
clp->rpc_ops = cl_init->rpc_ops;
if (cl_init->rpc_ops->version == 4) {
- if (nfs_callback_up() < 0)
+ err = nfs_callback_up();
+ if (err < 0)
goto error_2;
__set_bit(NFS_CS_CALLBACK, &clp->cl_res_state);
}
@@ -133,6 +135,7 @@ static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_
clp->cl_addrlen = cl_init->addrlen;
if (cl_init->hostname) {
+ err = -ENOMEM;
clp->cl_hostname = kstrdup(cl_init->hostname, GFP_KERNEL);
if (!clp->cl_hostname)
goto error_3;
@@ -165,7 +168,7 @@ error_3:
error_2:
kfree(clp);
error_0:
- return NULL;
+ return ERR_PTR(err);
}
static void nfs4_shutdown_client(struct nfs_client *clp)
@@ -456,9 +459,10 @@ static struct nfs_client *nfs_get_client(const struct nfs_client_initdata *cl_in
spin_unlock(&nfs_client_lock);
new = nfs_alloc_client(cl_init);
- } while (new);
+ } while (!IS_ERR(new));
- return ERR_PTR(-ENOMEM);
+ dprintk("--> nfs_get_client() = %ld [failed]\n", PTR_ERR(new));
+ return new;
/* install a new client and return with it unready */
install_client:
--
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