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nfsd4: fix leak of inode reference on delegation failure

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This fixes a regression from 68a3396178
"nfsd4: shut down more of delegation earlier".

After that commit, nfs4_set_delegation() failures result in
nfs4_put_delegation being called, but nfs4_put_delegation doesn't free
the nfs4_file that has already been set by alloc_init_deleg().

This can result in an oops on later unmounting the exported filesystem.

Note also delaying the fi_had_conflict check we're able to return a
better error (hence give 4.1 clients a better idea why the delegation
failed; though note CONFLICT isn't an exact match here, as that's
supposed to indicate a current conflict, but all we know here is that
there was one recently).

Reported-by: Toralf Förster <toralf.foerster@gmx.de>
Tested-by: Toralf Förster <toralf.foerster@gmx.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
J. Bruce Fields 2013-08-15 16:55:26 -04:00
parent 3477565e6a
commit bf7bd3e98b
1 changed files with 20 additions and 11 deletions
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31
fs/nfsd/nfs4state.c
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@ -368,11 +368,8 @@ static struct nfs4_delegation *
alloc_init_deleg(struct nfs4_client *clp, struct nfs4_ol_stateid *stp, struct svc_fh *current_fh)
{
struct nfs4_delegation *dp;
struct nfs4_file *fp = stp->st_file;
dprintk("NFSD alloc_init_deleg\n");
if (fp->fi_had_conflict)
return NULL;
if (num_delegations > max_delegations)
return NULL;
dp = delegstateid(nfs4_alloc_stid(clp, deleg_slab));
@ -389,8 +386,7 @@ alloc_init_deleg(struct nfs4_client *clp, struct nfs4_ol_stateid *stp, struct sv
INIT_LIST_HEAD(&dp->dl_perfile);
INIT_LIST_HEAD(&dp->dl_perclnt);
INIT_LIST_HEAD(&dp->dl_recall_lru);
get_nfs4_file(fp);
dp->dl_file = fp;
dp->dl_file = NULL;
dp->dl_type = NFS4_OPEN_DELEGATE_READ;
fh_copy_shallow(&dp->dl_fh, &current_fh->fh_handle);
dp->dl_time = 0;
@ -3044,22 +3040,35 @@ static int nfs4_setlease(struct nfs4_delegation *dp)
return 0;
}
static int nfs4_set_delegation(struct nfs4_delegation *dp)
static int nfs4_set_delegation(struct nfs4_delegation *dp, struct nfs4_file *fp)
{
struct nfs4_file *fp = dp->dl_file;
int status;
if (!fp->fi_lease)
return nfs4_setlease(dp);
if (fp->fi_had_conflict)
return -EAGAIN;
get_nfs4_file(fp);
dp->dl_file = fp;
if (!fp->fi_lease) {
status = nfs4_setlease(dp);
if (status)
goto out_free;
return 0;
}
spin_lock(&recall_lock);
if (fp->fi_had_conflict) {
spin_unlock(&recall_lock);
return -EAGAIN;
status = -EAGAIN;
goto out_free;
}
atomic_inc(&fp->fi_delegees);
list_add(&dp->dl_perfile, &fp->fi_delegations);
spin_unlock(&recall_lock);
list_add(&dp->dl_perclnt, &dp->dl_stid.sc_client->cl_delegations);
return 0;
out_free:
put_nfs4_file(fp);
dp->dl_file = fp;
return status;
}
static void nfsd4_open_deleg_none_ext(struct nfsd4_open *open, int status)
@ -3134,7 +3143,7 @@ nfs4_open_delegation(struct net *net, struct svc_fh *fh,
dp = alloc_init_deleg(oo->oo_owner.so_client, stp, fh);
if (dp == NULL)
goto out_no_deleg;
status = nfs4_set_delegation(dp);
status = nfs4_set_delegation(dp, stp->st_file);
if (status)
goto out_free;