Fedora kernel-2.6.17-1.2142_FC4 patched with stable patch-2.6.17.4-vs2.0.2-rc26.diff

[linux-2.6.git] / fs / nfs / delegation.c

diff --git a/fs/nfs/delegation.c b/fs/nfs/delegation.c
index 5b9c60f..d3be923 100644 (file)
--- a/fs/nfs/delegation.c
+++ b/fs/nfs/delegation.c
@@ -8,6 +8,7 @@
  */
 #include <linux/config.h>
 #include <linux/completion.h>
+#include <linux/kthread.h>
 #include <linux/module.h>
 #include <linux/sched.h>
 #include <linux/spinlock.h>
@@ -16,6 +17,7 @@
 #include <linux/nfs_fs.h>
 #include <linux/nfs_xdr.h>
 
+#include "nfs4_fs.h"
 #include "delegation.h"
 
 static struct nfs_delegation *nfs_alloc_delegation(void)
@@ -30,11 +32,42 @@ static void nfs_free_delegation(struct nfs_delegation *delegation)
        kfree(delegation);
 }
 
+static int nfs_delegation_claim_locks(struct nfs_open_context *ctx, struct nfs4_state *state)
+{
+       struct inode *inode = state->inode;
+       struct file_lock *fl;
+       int status;
+
+       for (fl = inode->i_flock; fl != 0; fl = fl->fl_next) {
+               if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK)))
+                       continue;
+               if ((struct nfs_open_context *)fl->fl_file->private_data != ctx)
+                       continue;
+               status = nfs4_lock_delegation_recall(state, fl);
+               if (status >= 0)
+                       continue;
+               switch (status) {
+                       default:
+                               printk(KERN_ERR "%s: unhandled error %d.\n",
+                                               __FUNCTION__, status);
+                       case -NFS4ERR_EXPIRED:
+                               /* kill_proc(fl->fl_pid, SIGLOST, 1); */
+                       case -NFS4ERR_STALE_CLIENTID:
+                               nfs4_schedule_state_recovery(NFS_SERVER(inode)->nfs4_state);
+                               goto out_err;
+               }
+       }
+       return 0;
+out_err:
+       return status;
+}
+
 static void nfs_delegation_claim_opens(struct inode *inode)
 {
        struct nfs_inode *nfsi = NFS_I(inode);
        struct nfs_open_context *ctx;
        struct nfs4_state *state;
+       int err;
 
 again:
        spin_lock(&inode->i_lock);
@@ -46,9 +79,12 @@ again:
                        continue;
                get_nfs_open_context(ctx);
                spin_unlock(&inode->i_lock);
-               if (nfs4_open_delegation_recall(ctx->dentry, state) < 0)
-                       return;
+               err = nfs4_open_delegation_recall(ctx->dentry, state);
+               if (err >= 0)
+                       err = nfs_delegation_claim_locks(ctx, state);
                put_nfs_open_context(ctx);
+               if (err != 0)
+                       return;
                goto again;
        }
        spin_unlock(&inode->i_lock);
@@ -84,6 +120,10 @@ int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct
        struct nfs_delegation *delegation;
        int status = 0;
 
+       /* Ensure we first revalidate the attributes and page cache! */
+       if ((nfsi->cache_validity & (NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_ATTR)))
+               __nfs_revalidate_inode(NFS_SERVER(inode), inode);
+
        delegation = nfs_alloc_delegation();
        if (delegation == NULL)
                return -ENOMEM;
@@ -91,6 +131,7 @@ int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct
                        sizeof(delegation->stateid.data));
        delegation->type = res->delegation_type;
        delegation->maxsize = res->maxsize;
+       delegation->change_attr = nfsi->change_attr;
        delegation->cred = get_rpccred(cred);
        delegation->inode = inode;
 
@@ -110,8 +151,7 @@ int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct
                }
        }
        spin_unlock(&clp->cl_lock);
-       if (delegation != NULL)
-               kfree(delegation);
+       kfree(delegation);
        return status;
 }
 
@@ -119,8 +159,6 @@ static int nfs_do_return_delegation(struct inode *inode, struct nfs_delegation *
 {
        int res = 0;
 
-       __nfs_revalidate_inode(NFS_SERVER(inode), inode);
-
        res = nfs4_proc_delegreturn(inode, delegation->cred, &delegation->stateid);
        nfs_free_delegation(delegation);
        return res;
@@ -137,7 +175,7 @@ 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)
+int __nfs_inode_return_delegation(struct inode *inode)
 {
        struct nfs4_client *clp = NFS_SERVER(inode)->nfs4_state;
        struct nfs_inode *nfsi = NFS_I(inode);
@@ -193,6 +231,49 @@ restart:
        spin_unlock(&clp->cl_lock);
 }
 
+int nfs_do_expire_all_delegations(void *ptr)
+{
+       struct nfs4_client *clp = ptr;
+       struct nfs_delegation *delegation;
+       struct inode *inode;
+
+       allow_signal(SIGKILL);
+restart:
+       spin_lock(&clp->cl_lock);
+       if (test_bit(NFS4CLNT_STATE_RECOVER, &clp->cl_state) != 0)
+               goto out;
+       if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0)
+               goto out;
+       list_for_each_entry(delegation, &clp->cl_delegations, super_list) {
+               inode = igrab(delegation->inode);
+               if (inode == NULL)
+                       continue;
+               spin_unlock(&clp->cl_lock);
+               nfs_inode_return_delegation(inode);
+               iput(inode);
+               goto restart;
+       }
+out:
+       spin_unlock(&clp->cl_lock);
+       nfs4_put_client(clp);
+       module_put_and_exit(0);
+}
+
+void nfs_expire_all_delegations(struct nfs4_client *clp)
+{
+       struct task_struct *task;
+
+       __module_get(THIS_MODULE);
+       atomic_inc(&clp->cl_count);
+       task = kthread_run(nfs_do_expire_all_delegations, clp,
+                       "%u.%u.%u.%u-delegreturn",
+                       NIPQUAD(clp->cl_addr));
+       if (!IS_ERR(task))
+               return;
+       nfs4_put_client(clp);
+       module_put(THIS_MODULE);
+}
+
 /*
  * Return all delegations following an NFS4ERR_CB_PATH_DOWN error.
  */
@@ -340,3 +421,22 @@ void nfs_delegation_reap_unclaimed(struct nfs4_client *clp)
                nfs_free_delegation(delegation);
        }
 }
+
+int nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode)
+{
+       struct nfs4_client *clp = NFS_SERVER(inode)->nfs4_state;
+       struct nfs_inode *nfsi = NFS_I(inode);
+       struct nfs_delegation *delegation;
+       int res = 0;
+
+       if (nfsi->delegation_state == 0)
+               return 0;
+       spin_lock(&clp->cl_lock);
+       delegation = nfsi->delegation;
+       if (delegation != NULL) {
+               memcpy(dst->data, delegation->stateid.data, sizeof(dst->data));
+               res = 1;
+       }
+       spin_unlock(&clp->cl_lock);
+       return res;
+}