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NFSv4: Support recalling delegations by stateid

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There appear to be some rogue servers out there that issue multiple
delegations with different stateids for the same file. Ensure that when we
return delegations, we do so on a per-stateid basis rather than a per-file
basis.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2007-07-05 14:55:18 -04:00
parent 2ced46c270
commit 9016302784
2 changed files with 51 additions and 39 deletions
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80
fs/nfs/delegation.c
View File

@ -57,7 +57,7 @@ out_err:
return status;
}
static void nfs_delegation_claim_opens(struct inode *inode)
static void nfs_delegation_claim_opens(struct inode *inode, const nfs4_stateid *stateid)
{
struct nfs_inode *nfsi = NFS_I(inode);
struct nfs_open_context *ctx;
@ -72,6 +72,8 @@ again:
continue;
if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
continue;
if (memcmp(state->stateid.data, stateid->data, sizeof(state->stateid.data)) != 0)
continue;
get_nfs_open_context(ctx);
spin_unlock(&inode->i_lock);
err = nfs4_open_delegation_recall(ctx, state);
@ -170,33 +172,55 @@ static void nfs_msync_inode(struct inode *inode)
/*
* Basic procedure for returning a delegation to the server
*/
int __nfs_inode_return_delegation(struct inode *inode)
static int __nfs_inode_return_delegation(struct inode *inode, struct nfs_delegation *delegation)
{
struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
struct nfs_inode *nfsi = NFS_I(inode);
struct nfs_delegation *delegation;
int res = 0;
nfs_msync_inode(inode);
down_read(&clp->cl_sem);
/* Guard against new delegated open calls */
down_write(&nfsi->rwsem);
spin_lock(&clp->cl_lock);
delegation = nfsi->delegation;
if (delegation != NULL) {
list_del_init(&delegation->super_list);
nfsi->delegation = NULL;
nfsi->delegation_state = 0;
}
spin_unlock(&clp->cl_lock);
nfs_delegation_claim_opens(inode);
nfs_delegation_claim_opens(inode, &delegation->stateid);
up_write(&nfsi->rwsem);
up_read(&clp->cl_sem);
nfs_msync_inode(inode);
if (delegation != NULL)
res = nfs_do_return_delegation(inode, delegation);
return res;
return nfs_do_return_delegation(inode, delegation);
}
static struct nfs_delegation *nfs_detach_delegation_locked(struct nfs_inode *nfsi, const nfs4_stateid *stateid)
{
struct nfs_delegation *delegation = nfsi->delegation;
if (delegation == NULL)
goto nomatch;
if (stateid != NULL && memcmp(delegation->stateid.data, stateid->data,
sizeof(delegation->stateid.data)) != 0)
goto nomatch;
list_del_init(&delegation->super_list);
nfsi->delegation = NULL;
nfsi->delegation_state = 0;
return delegation;
nomatch:
return NULL;
}
int nfs_inode_return_delegation(struct inode *inode)
{
struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
struct nfs_inode *nfsi = NFS_I(inode);
struct nfs_delegation *delegation;
int err = 0;
if (nfsi->delegation_state != 0) {
spin_lock(&clp->cl_lock);
delegation = nfs_detach_delegation_locked(nfsi, NULL);
spin_unlock(&clp->cl_lock);
if (delegation != NULL)
err = __nfs_inode_return_delegation(inode, delegation);
}
return err;
}
/*
@ -218,8 +242,9 @@ restart:
inode = igrab(delegation->inode);
if (inode == NULL)
continue;
nfs_detach_delegation_locked(NFS_I(inode), NULL);
spin_unlock(&clp->cl_lock);
nfs_inode_return_delegation(inode);
__nfs_inode_return_delegation(inode, delegation);
iput(inode);
goto restart;
}
@ -243,8 +268,9 @@ restart:
inode = igrab(delegation->inode);
if (inode == NULL)
continue;
nfs_detach_delegation_locked(NFS_I(inode), NULL);
spin_unlock(&clp->cl_lock);
nfs_inode_return_delegation(inode);
__nfs_inode_return_delegation(inode, delegation);
iput(inode);
goto restart;
}
@ -285,8 +311,9 @@ restart:
inode = igrab(delegation->inode);
if (inode == NULL)
continue;
nfs_detach_delegation_locked(NFS_I(inode), NULL);
spin_unlock(&clp->cl_lock);
nfs_inode_return_delegation(inode);
__nfs_inode_return_delegation(inode, delegation);
iput(inode);
goto restart;
}
@ -316,21 +343,14 @@ static int recall_thread(void *data)
down_read(&clp->cl_sem);
down_write(&nfsi->rwsem);
spin_lock(&clp->cl_lock);
delegation = nfsi->delegation;
if (delegation != NULL && memcmp(delegation->stateid.data,
args->stateid->data,
sizeof(delegation->stateid.data)) == 0) {
list_del_init(&delegation->super_list);
nfsi->delegation = NULL;
nfsi->delegation_state = 0;
delegation = nfs_detach_delegation_locked(nfsi, args->stateid);
if (delegation != NULL)
args->result = 0;
} else {
delegation = NULL;
else
args->result = -ENOENT;
}
spin_unlock(&clp->cl_lock);
complete(&args->started);
nfs_delegation_claim_opens(inode);
nfs_delegation_claim_opens(inode, args->stateid);
up_write(&nfsi->rwsem);
up_read(&clp->cl_sem);
nfs_msync_inode(inode);

10
fs/nfs/delegation.h
View File

@ -26,7 +26,7 @@ struct nfs_delegation {
int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res);
void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res);
int __nfs_inode_return_delegation(struct inode *inode);
int nfs_inode_return_delegation(struct inode *inode);
int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid);
struct inode *nfs_delegation_find_inode(struct nfs_client *clp, const struct nfs_fh *fhandle);
@ -52,14 +52,6 @@ static inline int nfs_have_delegation(struct inode *inode, int flags)
return 0;
}
static inline int nfs_inode_return_delegation(struct inode *inode)
{
int err = 0;
if (NFS_I(inode)->delegation != NULL)
err = __nfs_inode_return_delegation(inode);
return err;
}
#else
static inline int nfs_have_delegation(struct inode *inode, int flags)
{