From: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
When we add support for application level leases and knfsd delegations
to the NFS client, we we want to have them safely underpinned by a
"real" delegation to provide the caching guarantees. If that real
delegation is recalled, then we need to ensure that the application
leases/delegations are recalled too.
Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
---
fs/nfs/delegation.c | 23 +++++++++++++++++------
1 file changed, 17 insertions(+), 6 deletions(-)
diff --git a/fs/nfs/delegation.c b/fs/nfs/delegation.c
index 7c45ac3c3b0b..11118398f495 100644
--- a/fs/nfs/delegation.c
+++ b/fs/nfs/delegation.c
@@ -530,11 +530,18 @@ int nfs_inode_set_delegation(struct inode *inode, const struct cred *cred,
static int nfs_end_delegation_return(struct inode *inode, struct nfs_delegation *delegation, int issync)
{
struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
+ unsigned int mode = O_WRONLY | O_RDWR;
int err = 0;
if (delegation == NULL)
return 0;
- do {
+
+ if (!issync)
+ mode |= O_NONBLOCK;
+ /* Recall of any remaining application leases */
+ err = break_lease(inode, mode);
+
+ while (err == 0) {
if (test_bit(NFS_DELEGATION_REVOKED, &delegation->flags))
break;
err = nfs_delegation_claim_opens(inode, &delegation->stateid,
@@ -545,7 +552,7 @@ static int nfs_end_delegation_return(struct inode *inode, struct nfs_delegation
* Guard against state recovery
*/
err = nfs4_wait_clnt_recover(clp);
- } while (err == 0);
+ }
if (err) {
nfs_abort_delegation_return(delegation, clp, err);
@@ -746,13 +753,14 @@ int nfs4_inode_return_delegation(struct inode *inode)
{
struct nfs_inode *nfsi = NFS_I(inode);
struct nfs_delegation *delegation;
- int err = 0;
- nfs_wb_all(inode);
delegation = nfs_start_delegation_return(nfsi);
+ /* Synchronous recall of any application leases */
+ break_lease(inode, O_WRONLY | O_RDWR);
+ nfs_wb_all(inode);
if (delegation != NULL)
- err = nfs_end_delegation_return(inode, delegation, 1);
- return err;
+ return nfs_end_delegation_return(inode, delegation, 1);
+ return 0;
}
/**
@@ -1051,6 +1059,9 @@ int nfs_async_inode_return_delegation(struct inode *inode,
nfs_mark_return_delegation(server, delegation);
rcu_read_unlock();
+ /* If there are any application leases or delegations, recall them */
+ break_lease(inode, O_WRONLY | O_RDWR | O_NONBLOCK);
+
nfs_delegation_run_state_manager(clp);
return 0;
out_enoent:
--
2.31.1
