forked from luck/tmp_suning_uos_patched
a1d0b5eebc
If we know that the delegation stateid is bad or revoked, we need to remove that delegation as soon as possible, and then mark all the stateids that relied on that delegation for recovery. We cannot use the delegation as part of the recovery process. Also note that NFSv4.1 uses a different error code (NFS4ERR_DELEG_REVOKED) to indicate that the delegation was revoked. Finally, ensure that setlk() and setattr() can both recover safely from a revoked delegation. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com> Cc: stable@vger.kernel.org
717 lines
18 KiB
C
717 lines
18 KiB
C
/*
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* linux/fs/nfs/delegation.c
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*
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* Copyright (C) 2004 Trond Myklebust
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*
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* NFS file delegation management
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*
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*/
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#include <linux/completion.h>
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#include <linux/kthread.h>
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/nfs4.h>
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#include <linux/nfs_fs.h>
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#include <linux/nfs_xdr.h>
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#include "nfs4_fs.h"
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#include "delegation.h"
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#include "internal.h"
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static void nfs_free_delegation(struct nfs_delegation *delegation)
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{
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if (delegation->cred) {
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put_rpccred(delegation->cred);
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delegation->cred = NULL;
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}
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kfree_rcu(delegation, rcu);
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}
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/**
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* nfs_mark_delegation_referenced - set delegation's REFERENCED flag
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* @delegation: delegation to process
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*
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*/
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void nfs_mark_delegation_referenced(struct nfs_delegation *delegation)
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{
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set_bit(NFS_DELEGATION_REFERENCED, &delegation->flags);
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}
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/**
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* nfs_have_delegation - check if inode has a delegation
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* @inode: inode to check
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* @flags: delegation types to check for
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*
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* Returns one if inode has the indicated delegation, otherwise zero.
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*/
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int nfs_have_delegation(struct inode *inode, fmode_t flags)
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{
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struct nfs_delegation *delegation;
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int ret = 0;
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flags &= FMODE_READ|FMODE_WRITE;
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rcu_read_lock();
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delegation = rcu_dereference(NFS_I(inode)->delegation);
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if (delegation != NULL && (delegation->type & flags) == flags) {
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nfs_mark_delegation_referenced(delegation);
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ret = 1;
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}
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rcu_read_unlock();
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return ret;
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}
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static int nfs_delegation_claim_locks(struct nfs_open_context *ctx, struct nfs4_state *state)
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{
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struct inode *inode = state->inode;
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struct file_lock *fl;
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int status = 0;
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if (inode->i_flock == NULL)
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goto out;
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/* Protect inode->i_flock using the file locks lock */
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lock_flocks();
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for (fl = inode->i_flock; fl != NULL; fl = fl->fl_next) {
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if (!(fl->fl_flags & (FL_POSIX|FL_FLOCK)))
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continue;
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if (nfs_file_open_context(fl->fl_file) != ctx)
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continue;
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unlock_flocks();
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status = nfs4_lock_delegation_recall(state, fl);
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if (status < 0)
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goto out;
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lock_flocks();
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}
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unlock_flocks();
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out:
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return status;
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}
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static int nfs_delegation_claim_opens(struct inode *inode, const nfs4_stateid *stateid)
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{
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struct nfs_inode *nfsi = NFS_I(inode);
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struct nfs_open_context *ctx;
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struct nfs4_state *state;
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int err;
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again:
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spin_lock(&inode->i_lock);
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list_for_each_entry(ctx, &nfsi->open_files, list) {
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state = ctx->state;
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if (state == NULL)
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continue;
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if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
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continue;
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if (memcmp(state->stateid.data, stateid->data, sizeof(state->stateid.data)) != 0)
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continue;
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get_nfs_open_context(ctx);
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spin_unlock(&inode->i_lock);
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err = nfs4_open_delegation_recall(ctx, state, stateid);
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if (err >= 0)
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err = nfs_delegation_claim_locks(ctx, state);
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put_nfs_open_context(ctx);
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if (err != 0)
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return err;
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goto again;
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}
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spin_unlock(&inode->i_lock);
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return 0;
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}
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/**
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* nfs_inode_reclaim_delegation - process a delegation reclaim request
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* @inode: inode to process
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* @cred: credential to use for request
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* @res: new delegation state from server
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*
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*/
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void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred,
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struct nfs_openres *res)
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{
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struct nfs_delegation *delegation;
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struct rpc_cred *oldcred = NULL;
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rcu_read_lock();
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delegation = rcu_dereference(NFS_I(inode)->delegation);
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if (delegation != NULL) {
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spin_lock(&delegation->lock);
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if (delegation->inode != NULL) {
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memcpy(delegation->stateid.data, res->delegation.data,
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sizeof(delegation->stateid.data));
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delegation->type = res->delegation_type;
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delegation->maxsize = res->maxsize;
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oldcred = delegation->cred;
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delegation->cred = get_rpccred(cred);
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clear_bit(NFS_DELEGATION_NEED_RECLAIM,
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&delegation->flags);
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NFS_I(inode)->delegation_state = delegation->type;
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spin_unlock(&delegation->lock);
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put_rpccred(oldcred);
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rcu_read_unlock();
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} else {
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/* We appear to have raced with a delegation return. */
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spin_unlock(&delegation->lock);
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rcu_read_unlock();
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nfs_inode_set_delegation(inode, cred, res);
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}
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} else {
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rcu_read_unlock();
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}
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}
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static int nfs_do_return_delegation(struct inode *inode, struct nfs_delegation *delegation, int issync)
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{
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int res = 0;
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res = nfs4_proc_delegreturn(inode, delegation->cred, &delegation->stateid, issync);
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nfs_free_delegation(delegation);
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return res;
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}
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static struct inode *nfs_delegation_grab_inode(struct nfs_delegation *delegation)
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{
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struct inode *inode = NULL;
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spin_lock(&delegation->lock);
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if (delegation->inode != NULL)
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inode = igrab(delegation->inode);
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spin_unlock(&delegation->lock);
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return inode;
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}
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static struct nfs_delegation *
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nfs_detach_delegation_locked(struct nfs_inode *nfsi,
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struct nfs_server *server)
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{
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struct nfs_delegation *delegation =
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rcu_dereference_protected(nfsi->delegation,
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lockdep_is_held(&server->nfs_client->cl_lock));
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if (delegation == NULL)
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goto nomatch;
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spin_lock(&delegation->lock);
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list_del_rcu(&delegation->super_list);
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delegation->inode = NULL;
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nfsi->delegation_state = 0;
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rcu_assign_pointer(nfsi->delegation, NULL);
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spin_unlock(&delegation->lock);
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return delegation;
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nomatch:
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return NULL;
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}
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static struct nfs_delegation *nfs_detach_delegation(struct nfs_inode *nfsi,
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struct nfs_server *server)
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{
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struct nfs_client *clp = server->nfs_client;
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struct nfs_delegation *delegation;
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spin_lock(&clp->cl_lock);
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delegation = nfs_detach_delegation_locked(nfsi, server);
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spin_unlock(&clp->cl_lock);
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return delegation;
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}
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/**
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* nfs_inode_set_delegation - set up a delegation on an inode
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* @inode: inode to which delegation applies
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* @cred: cred to use for subsequent delegation processing
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* @res: new delegation state from server
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*
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* Returns zero on success, or a negative errno value.
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*/
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int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res)
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{
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struct nfs_server *server = NFS_SERVER(inode);
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struct nfs_client *clp = server->nfs_client;
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struct nfs_inode *nfsi = NFS_I(inode);
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struct nfs_delegation *delegation, *old_delegation;
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struct nfs_delegation *freeme = NULL;
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int status = 0;
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delegation = kmalloc(sizeof(*delegation), GFP_NOFS);
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if (delegation == NULL)
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return -ENOMEM;
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memcpy(delegation->stateid.data, res->delegation.data,
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sizeof(delegation->stateid.data));
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delegation->type = res->delegation_type;
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delegation->maxsize = res->maxsize;
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delegation->change_attr = inode->i_version;
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delegation->cred = get_rpccred(cred);
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delegation->inode = inode;
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delegation->flags = 1<<NFS_DELEGATION_REFERENCED;
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spin_lock_init(&delegation->lock);
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spin_lock(&clp->cl_lock);
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old_delegation = rcu_dereference_protected(nfsi->delegation,
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lockdep_is_held(&clp->cl_lock));
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if (old_delegation != NULL) {
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if (memcmp(&delegation->stateid, &old_delegation->stateid,
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sizeof(old_delegation->stateid)) == 0 &&
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delegation->type == old_delegation->type) {
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goto out;
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}
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/*
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* Deal with broken servers that hand out two
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* delegations for the same file.
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*/
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dfprintk(FILE, "%s: server %s handed out "
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"a duplicate delegation!\n",
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__func__, clp->cl_hostname);
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if (delegation->type <= old_delegation->type) {
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freeme = delegation;
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delegation = NULL;
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goto out;
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}
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freeme = nfs_detach_delegation_locked(nfsi, server);
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}
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list_add_rcu(&delegation->super_list, &server->delegations);
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nfsi->delegation_state = delegation->type;
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rcu_assign_pointer(nfsi->delegation, delegation);
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delegation = NULL;
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/* Ensure we revalidate the attributes and page cache! */
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spin_lock(&inode->i_lock);
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nfsi->cache_validity |= NFS_INO_REVAL_FORCED;
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spin_unlock(&inode->i_lock);
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out:
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spin_unlock(&clp->cl_lock);
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if (delegation != NULL)
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nfs_free_delegation(delegation);
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if (freeme != NULL)
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nfs_do_return_delegation(inode, freeme, 0);
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return status;
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}
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/*
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* Basic procedure for returning a delegation to the server
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*/
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static int __nfs_inode_return_delegation(struct inode *inode, struct nfs_delegation *delegation, int issync)
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{
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struct nfs_inode *nfsi = NFS_I(inode);
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int err;
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/*
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* Guard against new delegated open/lock/unlock calls and against
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* state recovery
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*/
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down_write(&nfsi->rwsem);
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err = nfs_delegation_claim_opens(inode, &delegation->stateid);
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up_write(&nfsi->rwsem);
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if (err)
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goto out;
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err = nfs_do_return_delegation(inode, delegation, issync);
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out:
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return err;
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}
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/**
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* nfs_client_return_marked_delegations - return previously marked delegations
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* @clp: nfs_client to process
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*
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* Returns zero on success, or a negative errno value.
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*/
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int nfs_client_return_marked_delegations(struct nfs_client *clp)
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{
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struct nfs_delegation *delegation;
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struct nfs_server *server;
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struct inode *inode;
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int err = 0;
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restart:
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rcu_read_lock();
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list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
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list_for_each_entry_rcu(delegation, &server->delegations,
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super_list) {
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if (!test_and_clear_bit(NFS_DELEGATION_RETURN,
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&delegation->flags))
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continue;
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inode = nfs_delegation_grab_inode(delegation);
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if (inode == NULL)
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continue;
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delegation = nfs_detach_delegation(NFS_I(inode),
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server);
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rcu_read_unlock();
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if (delegation != NULL) {
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filemap_flush(inode->i_mapping);
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err = __nfs_inode_return_delegation(inode,
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delegation, 0);
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}
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iput(inode);
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if (!err)
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goto restart;
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set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state);
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return err;
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}
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}
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rcu_read_unlock();
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return 0;
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}
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/**
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* nfs_inode_return_delegation_noreclaim - return delegation, don't reclaim opens
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* @inode: inode to process
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*
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* Does not protect against delegation reclaims, therefore really only safe
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* to be called from nfs4_clear_inode().
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*/
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void nfs_inode_return_delegation_noreclaim(struct inode *inode)
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{
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struct nfs_server *server = NFS_SERVER(inode);
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struct nfs_inode *nfsi = NFS_I(inode);
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struct nfs_delegation *delegation;
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if (rcu_access_pointer(nfsi->delegation) != NULL) {
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delegation = nfs_detach_delegation(nfsi, server);
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if (delegation != NULL)
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nfs_do_return_delegation(inode, delegation, 0);
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}
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}
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/**
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* nfs_inode_return_delegation - synchronously return a delegation
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* @inode: inode to process
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*
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* Returns zero on success, or a negative errno value.
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*/
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int nfs_inode_return_delegation(struct inode *inode)
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{
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struct nfs_server *server = NFS_SERVER(inode);
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struct nfs_inode *nfsi = NFS_I(inode);
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struct nfs_delegation *delegation;
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int err = 0;
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if (rcu_access_pointer(nfsi->delegation) != NULL) {
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delegation = nfs_detach_delegation(nfsi, server);
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if (delegation != NULL) {
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nfs_wb_all(inode);
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err = __nfs_inode_return_delegation(inode, delegation, 1);
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}
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}
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return err;
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}
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static void nfs_mark_return_delegation(struct nfs_server *server,
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struct nfs_delegation *delegation)
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{
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set_bit(NFS_DELEGATION_RETURN, &delegation->flags);
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set_bit(NFS4CLNT_DELEGRETURN, &server->nfs_client->cl_state);
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}
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/**
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* nfs_super_return_all_delegations - return delegations for one superblock
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* @sb: sb to process
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*
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*/
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void nfs_super_return_all_delegations(struct super_block *sb)
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{
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struct nfs_server *server = NFS_SB(sb);
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struct nfs_client *clp = server->nfs_client;
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struct nfs_delegation *delegation;
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if (clp == NULL)
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return;
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rcu_read_lock();
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list_for_each_entry_rcu(delegation, &server->delegations, super_list) {
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spin_lock(&delegation->lock);
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set_bit(NFS_DELEGATION_RETURN, &delegation->flags);
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spin_unlock(&delegation->lock);
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}
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rcu_read_unlock();
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if (nfs_client_return_marked_delegations(clp) != 0)
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nfs4_schedule_state_manager(clp);
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}
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static void nfs_mark_return_all_delegation_types(struct nfs_server *server,
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fmode_t flags)
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{
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struct nfs_delegation *delegation;
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list_for_each_entry_rcu(delegation, &server->delegations, super_list) {
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if ((delegation->type == (FMODE_READ|FMODE_WRITE)) && !(flags & FMODE_WRITE))
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continue;
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if (delegation->type & flags)
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nfs_mark_return_delegation(server, delegation);
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}
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}
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static void nfs_client_mark_return_all_delegation_types(struct nfs_client *clp,
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fmode_t flags)
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{
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struct nfs_server *server;
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rcu_read_lock();
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list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
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nfs_mark_return_all_delegation_types(server, flags);
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rcu_read_unlock();
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}
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static void nfs_client_mark_return_all_delegations(struct nfs_client *clp)
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{
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nfs_client_mark_return_all_delegation_types(clp, FMODE_READ|FMODE_WRITE);
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}
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static void nfs_delegation_run_state_manager(struct nfs_client *clp)
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{
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if (test_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state))
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nfs4_schedule_state_manager(clp);
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}
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void nfs_remove_bad_delegation(struct inode *inode)
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{
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struct nfs_delegation *delegation;
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delegation = nfs_detach_delegation(NFS_I(inode), NFS_SERVER(inode));
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if (delegation) {
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nfs_inode_find_state_and_recover(inode, &delegation->stateid);
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nfs_free_delegation(delegation);
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}
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}
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/**
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* nfs_expire_all_delegation_types
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* @clp: client to process
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* @flags: delegation types to expire
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*
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|
*/
|
|
void nfs_expire_all_delegation_types(struct nfs_client *clp, fmode_t flags)
|
|
{
|
|
nfs_client_mark_return_all_delegation_types(clp, flags);
|
|
nfs_delegation_run_state_manager(clp);
|
|
}
|
|
|
|
/**
|
|
* nfs_expire_all_delegations
|
|
* @clp: client to process
|
|
*
|
|
*/
|
|
void nfs_expire_all_delegations(struct nfs_client *clp)
|
|
{
|
|
nfs_expire_all_delegation_types(clp, FMODE_READ|FMODE_WRITE);
|
|
}
|
|
|
|
/**
|
|
* nfs_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN
|
|
* @clp: client to process
|
|
*
|
|
*/
|
|
void nfs_handle_cb_pathdown(struct nfs_client *clp)
|
|
{
|
|
if (clp == NULL)
|
|
return;
|
|
nfs_client_mark_return_all_delegations(clp);
|
|
}
|
|
|
|
static void nfs_mark_return_unreferenced_delegations(struct nfs_server *server)
|
|
{
|
|
struct nfs_delegation *delegation;
|
|
|
|
list_for_each_entry_rcu(delegation, &server->delegations, super_list) {
|
|
if (test_and_clear_bit(NFS_DELEGATION_REFERENCED, &delegation->flags))
|
|
continue;
|
|
nfs_mark_return_delegation(server, delegation);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* nfs_expire_unreferenced_delegations - Eliminate unused delegations
|
|
* @clp: nfs_client to process
|
|
*
|
|
*/
|
|
void nfs_expire_unreferenced_delegations(struct nfs_client *clp)
|
|
{
|
|
struct nfs_server *server;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
|
|
nfs_mark_return_unreferenced_delegations(server);
|
|
rcu_read_unlock();
|
|
|
|
nfs_delegation_run_state_manager(clp);
|
|
}
|
|
|
|
/**
|
|
* nfs_async_inode_return_delegation - asynchronously return a delegation
|
|
* @inode: inode to process
|
|
* @stateid: state ID information from CB_RECALL arguments
|
|
*
|
|
* Returns zero on success, or a negative errno value.
|
|
*/
|
|
int nfs_async_inode_return_delegation(struct inode *inode,
|
|
const nfs4_stateid *stateid)
|
|
{
|
|
struct nfs_server *server = NFS_SERVER(inode);
|
|
struct nfs_client *clp = server->nfs_client;
|
|
struct nfs_delegation *delegation;
|
|
|
|
rcu_read_lock();
|
|
delegation = rcu_dereference(NFS_I(inode)->delegation);
|
|
|
|
if (!clp->cl_mvops->validate_stateid(delegation, stateid)) {
|
|
rcu_read_unlock();
|
|
return -ENOENT;
|
|
}
|
|
nfs_mark_return_delegation(server, delegation);
|
|
rcu_read_unlock();
|
|
|
|
nfs_delegation_run_state_manager(clp);
|
|
return 0;
|
|
}
|
|
|
|
static struct inode *
|
|
nfs_delegation_find_inode_server(struct nfs_server *server,
|
|
const struct nfs_fh *fhandle)
|
|
{
|
|
struct nfs_delegation *delegation;
|
|
struct inode *res = NULL;
|
|
|
|
list_for_each_entry_rcu(delegation, &server->delegations, super_list) {
|
|
spin_lock(&delegation->lock);
|
|
if (delegation->inode != NULL &&
|
|
nfs_compare_fh(fhandle, &NFS_I(delegation->inode)->fh) == 0) {
|
|
res = igrab(delegation->inode);
|
|
}
|
|
spin_unlock(&delegation->lock);
|
|
if (res != NULL)
|
|
break;
|
|
}
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* nfs_delegation_find_inode - retrieve the inode associated with a delegation
|
|
* @clp: client state handle
|
|
* @fhandle: filehandle from a delegation recall
|
|
*
|
|
* Returns pointer to inode matching "fhandle," or NULL if a matching inode
|
|
* cannot be found.
|
|
*/
|
|
struct inode *nfs_delegation_find_inode(struct nfs_client *clp,
|
|
const struct nfs_fh *fhandle)
|
|
{
|
|
struct nfs_server *server;
|
|
struct inode *res = NULL;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
|
|
res = nfs_delegation_find_inode_server(server, fhandle);
|
|
if (res != NULL)
|
|
break;
|
|
}
|
|
rcu_read_unlock();
|
|
return res;
|
|
}
|
|
|
|
static void nfs_delegation_mark_reclaim_server(struct nfs_server *server)
|
|
{
|
|
struct nfs_delegation *delegation;
|
|
|
|
list_for_each_entry_rcu(delegation, &server->delegations, super_list)
|
|
set_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags);
|
|
}
|
|
|
|
/**
|
|
* nfs_delegation_mark_reclaim - mark all delegations as needing to be reclaimed
|
|
* @clp: nfs_client to process
|
|
*
|
|
*/
|
|
void nfs_delegation_mark_reclaim(struct nfs_client *clp)
|
|
{
|
|
struct nfs_server *server;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
|
|
nfs_delegation_mark_reclaim_server(server);
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
/**
|
|
* nfs_delegation_reap_unclaimed - reap unclaimed delegations after reboot recovery is done
|
|
* @clp: nfs_client to process
|
|
*
|
|
*/
|
|
void nfs_delegation_reap_unclaimed(struct nfs_client *clp)
|
|
{
|
|
struct nfs_delegation *delegation;
|
|
struct nfs_server *server;
|
|
struct inode *inode;
|
|
|
|
restart:
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
|
|
list_for_each_entry_rcu(delegation, &server->delegations,
|
|
super_list) {
|
|
if (test_bit(NFS_DELEGATION_NEED_RECLAIM,
|
|
&delegation->flags) == 0)
|
|
continue;
|
|
inode = nfs_delegation_grab_inode(delegation);
|
|
if (inode == NULL)
|
|
continue;
|
|
delegation = nfs_detach_delegation(NFS_I(inode),
|
|
server);
|
|
rcu_read_unlock();
|
|
|
|
if (delegation != NULL)
|
|
nfs_free_delegation(delegation);
|
|
iput(inode);
|
|
goto restart;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
/**
|
|
* nfs_delegations_present - check for existence of delegations
|
|
* @clp: client state handle
|
|
*
|
|
* Returns one if there are any nfs_delegation structures attached
|
|
* to this nfs_client.
|
|
*/
|
|
int nfs_delegations_present(struct nfs_client *clp)
|
|
{
|
|
struct nfs_server *server;
|
|
int ret = 0;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
|
|
if (!list_empty(&server->delegations)) {
|
|
ret = 1;
|
|
break;
|
|
}
|
|
rcu_read_unlock();
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* nfs4_copy_delegation_stateid - Copy inode's state ID information
|
|
* @dst: stateid data structure to fill in
|
|
* @inode: inode to check
|
|
*
|
|
* Returns one and fills in "dst->data" * if inode had a delegation,
|
|
* otherwise zero is returned.
|
|
*/
|
|
int nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode)
|
|
{
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
struct nfs_delegation *delegation;
|
|
int ret = 0;
|
|
|
|
rcu_read_lock();
|
|
delegation = rcu_dereference(nfsi->delegation);
|
|
if (delegation != NULL) {
|
|
memcpy(dst->data, delegation->stateid.data, sizeof(dst->data));
|
|
ret = 1;
|
|
}
|
|
rcu_read_unlock();
|
|
return ret;
|
|
}
|