On Thu, 2012-08-16 at 16:50 -0700, Shai Lazmi wrote:
> MS outlook
Don't ever use LookOut for patches. Its "I just reformatted your email"
wonder feature breaks all the whitespace.
> Best thing is to attached the patch
We do not normally use attachments on the mailing list because it makes
it impossible to comment the patches inline. Ah well, here goes...
--
Trond Myklebust
Linux NFS client maintainer
NetApp
Trond.Myklebust@xxxxxxxxxx
www.netapp.com
From 7f26d74498ca000ccfa28515b86998f0a0c2298a Mon Sep 17 00:00:00 2001
From: Bryan Schumaker <bjschuma@xxxxxxxxxx>
Date: Thu, 9 Aug 2012 14:05:49 -0400
Subject: [PATCH 1/2] NFS: Clear key construction data if the idmap upcall
fails
idmap_pipe_downcall already clears this field if the upcall succeeds,
but if it fails (rpc.idmapd isn't running) the field will still be set
on the next call triggering a BUG_ON(). This patch tries to handle all
possible ways that the upcall could fail and clear the idmap key data
for each one.
Signed-off-by: Bryan Schumaker <bjschuma@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx [>= 3.4]
Signed-off-by: Trond Myklebust <Trond.Myklebust@xxxxxxxxxx>
---
fs/nfs/idmap.c | 56 ++++++++++++++++++++++++++++++++++++++++++--------------
1 file changed, 42 insertions(+), 14 deletions(-)
diff --git a/fs/nfs/idmap.c b/fs/nfs/idmap.c
index b701358..6703c73 100644
--- a/fs/nfs/idmap.c
+++ b/fs/nfs/idmap.c
@@ -61,6 +61,12 @@ struct idmap {
struct mutex idmap_mutex;
};
+struct idmap_legacy_upcalldata {
+ struct rpc_pipe_msg pipe_msg;
+ struct idmap_msg idmap_msg;
+ struct idmap *idmap;
+};
+
/**
* nfs_fattr_init_names - initialise the nfs_fattr owner_name/group_name fields
* @fattr: fully initialised struct nfs_fattr
@@ -324,6 +330,7 @@ static ssize_t nfs_idmap_get_key(const char *name, size_t namelen,
ret = nfs_idmap_request_key(&key_type_id_resolver_legacy,
name, namelen, type, data,
data_size, idmap);
+ idmap->idmap_key_cons = NULL;
mutex_unlock(&idmap->idmap_mutex);
}
return ret;
@@ -380,11 +387,13 @@ static const match_table_t nfs_idmap_tokens = {
static int nfs_idmap_legacy_upcall(struct key_construction *, const char *, void *);
static ssize_t idmap_pipe_downcall(struct file *, const char __user *,
size_t);
+static void idmap_release_pipe(struct inode *);
static void idmap_pipe_destroy_msg(struct rpc_pipe_msg *);
static const struct rpc_pipe_ops idmap_upcall_ops = {
.upcall = rpc_pipe_generic_upcall,
.downcall = idmap_pipe_downcall,
+ .release_pipe = idmap_release_pipe,
.destroy_msg = idmap_pipe_destroy_msg,
};
@@ -616,7 +625,8 @@ void nfs_idmap_quit(void)
nfs_idmap_quit_keyring();
}
-static int nfs_idmap_prepare_message(char *desc, struct idmap_msg *im,
+static int nfs_idmap_prepare_message(char *desc, struct idmap *idmap,
+ struct idmap_msg *im,
struct rpc_pipe_msg *msg)
{
substring_t substr;
@@ -659,6 +669,7 @@ static int nfs_idmap_legacy_upcall(struct key_construction *cons,
const char *op,
void *aux)
{
+ struct idmap_legacy_upcalldata *data;
struct rpc_pipe_msg *msg;
struct idmap_msg *im;
struct idmap *idmap = (struct idmap *)aux;
@@ -666,15 +677,15 @@ static int nfs_idmap_legacy_upcall(struct key_construction *cons,
int ret = -ENOMEM;
/* msg and im are freed in idmap_pipe_destroy_msg */
- msg = kmalloc(sizeof(*msg), GFP_KERNEL);
- if (!msg)
- goto out0;
-
- im = kmalloc(sizeof(*im), GFP_KERNEL);
- if (!im)
+ data = kmalloc(sizeof(*data), GFP_KERNEL);
+ if (!data)
goto out1;
- ret = nfs_idmap_prepare_message(key->description, im, msg);
+ msg = &data->pipe_msg;
+ im = &data->idmap_msg;
+ data->idmap = idmap;
+
+ ret = nfs_idmap_prepare_message(key->description, idmap, im, msg);
if (ret < 0)
goto out2;
@@ -683,15 +694,15 @@ static int nfs_idmap_legacy_upcall(struct key_construction *cons,
ret = rpc_queue_upcall(idmap->idmap_pipe, msg);
if (ret < 0)
- goto out2;
+ goto out3;
return ret;
+out3:
+ idmap->idmap_key_cons = NULL;
out2:
- kfree(im);
+ kfree(data);
out1:
- kfree(msg);
-out0:
complete_request_key(cons, ret);
return ret;
}
@@ -775,9 +786,26 @@ out_incomplete:
static void
idmap_pipe_destroy_msg(struct rpc_pipe_msg *msg)
{
+ struct idmap_legacy_upcalldata *data = container_of(msg,
+ struct idmap_legacy_upcalldata,
+ pipe_msg);
+ struct idmap *idmap = data->idmap;
+ struct key_construction *cons;
+ if (msg->errno) {
+ cons = ACCESS_ONCE(idmap->idmap_key_cons);
+ idmap->idmap_key_cons = NULL;
+ complete_request_key(cons, msg->errno);
+ }
/* Free memory allocated in nfs_idmap_legacy_upcall() */
- kfree(msg->data);
- kfree(msg);
+ kfree(data);
+}
+
+static void
+idmap_release_pipe(struct inode *inode)
+{
+ struct rpc_inode *rpci = RPC_I(inode);
+ struct idmap *idmap = (struct idmap *)rpci->private;
+ idmap->idmap_key_cons = NULL;
}
int nfs_map_name_to_uid(const struct nfs_server *server, const char *name, size_t namelen, __u32 *uid)
--
1.7.11.2
From d0f6eca7eb175373a61173d86f3cf4ec4a9166fa Mon Sep 17 00:00:00 2001
From: Bryan Schumaker <bjschuma@xxxxxxxxxx>
Date: Thu, 9 Aug 2012 14:05:50 -0400
Subject: [PATCH 2/2] NFS: return -ENOKEY when the upcall fails to map the
name
This allows the normal error-paths to handle the error, rather than
making a special call to complete_request_key() just for this instance.
Signed-off-by: Bryan Schumaker <bjschuma@xxxxxxxxxx>
Tested-by: William Dauchy <wdauchy@xxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx [>= 3.4]
Signed-off-by: Trond Myklebust <Trond.Myklebust@xxxxxxxxxx>
---
fs/nfs/idmap.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/fs/nfs/idmap.c b/fs/nfs/idmap.c
index 6703c73..a850079 100644
--- a/fs/nfs/idmap.c
+++ b/fs/nfs/idmap.c
@@ -760,9 +760,8 @@ idmap_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
}
if (!(im.im_status & IDMAP_STATUS_SUCCESS)) {
- ret = mlen;
- complete_request_key(cons, -ENOKEY);
- goto out_incomplete;
+ ret = -ENOKEY;
+ goto out;
}
namelen_in = strnlen(im.im_name, IDMAP_NAMESZ);
@@ -779,7 +778,6 @@ idmap_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
out:
complete_request_key(cons, ret);
-out_incomplete:
return ret;
}
--
1.7.11.2
