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authorTrond Myklebust <Trond.Myklebust@netapp.com>2013-04-23 14:52:44 -0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2013-04-23 14:52:44 -0400
commitbdeca1b76cd56cd10a029f0ad2fd9ab6dd7e313d (patch)
tree3fcbc68bfb122aaf959e8c53e4d5fe0ec752369d /fs/nfs
parentcd4c9be2c61d4d974d348743fddb8183b8185abc (diff)
NFSv4: Don't recheck permissions on open in case of recovery cached open
If we already checked the user access permissions on the original open, then don't bother checking again on recovery. Doing so can cause a deadlock with NFSv4.1, since the may_open() operation is not privileged. Furthermore, we can't report an access permission failure here anyway. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/nfs')
-rw-r--r--fs/nfs/nfs4proc.c14
1 files changed, 10 insertions, 4 deletions
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index ea50807b65d..e18b3b46c00 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -769,6 +769,7 @@ struct nfs4_opendata {
struct iattr attrs;
unsigned long timestamp;
unsigned int rpc_done : 1;
+ unsigned int is_recover : 1;
int rpc_status;
int cancelled;
};
@@ -1101,9 +1102,11 @@ static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
/* Save the delegation */
nfs4_stateid_copy(&stateid, &delegation->stateid);
rcu_read_unlock();
- ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
- if (ret != 0)
- goto out;
+ if (!opendata->is_recover) {
+ ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
+ if (ret != 0)
+ goto out;
+ }
ret = -EAGAIN;
/* Try to update the stateid using the delegation */
@@ -1670,8 +1673,11 @@ static int nfs4_run_open_task(struct nfs4_opendata *data, int isrecover)
data->rpc_done = 0;
data->rpc_status = 0;
data->cancelled = 0;
- if (isrecover)
+ data->is_recover = 0;
+ if (isrecover) {
nfs4_set_sequence_privileged(&o_arg->seq_args);
+ data->is_recover = 1;
+ }
task = rpc_run_task(&task_setup_data);
if (IS_ERR(task))
return PTR_ERR(task);