1222 lines
32 KiB
C
1222 lines
32 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/iversion.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 "nfs4session.h"
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#include "delegation.h"
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#include "internal.h"
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#include "nfs4trace.h"
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static void nfs_free_delegation(struct nfs_delegation *delegation)
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{
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put_cred(delegation->cred);
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delegation->cred = NULL;
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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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static bool
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nfs4_is_valid_delegation(const struct nfs_delegation *delegation,
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fmode_t flags)
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{
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if (delegation != NULL && (delegation->type & flags) == flags &&
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!test_bit(NFS_DELEGATION_REVOKED, &delegation->flags) &&
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!test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
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return true;
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return false;
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}
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static int
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nfs4_do_check_delegation(struct inode *inode, fmode_t flags, bool mark)
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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 (nfs4_is_valid_delegation(delegation, flags)) {
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if (mark)
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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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/**
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* nfs_have_delegation - check if inode has a delegation, mark it
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* NFS_DELEGATION_REFERENCED if there is one.
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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 nfs4_have_delegation(struct inode *inode, fmode_t flags)
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{
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return nfs4_do_check_delegation(inode, flags, true);
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}
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/*
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* nfs4_check_delegation - check if inode has a delegation, do not mark
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* NFS_DELEGATION_REFERENCED if it has one.
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*/
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int nfs4_check_delegation(struct inode *inode, fmode_t flags)
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{
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return nfs4_do_check_delegation(inode, flags, false);
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}
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static int nfs_delegation_claim_locks(struct nfs4_state *state, const nfs4_stateid *stateid)
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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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struct file_lock_context *flctx = inode->i_flctx;
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struct list_head *list;
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int status = 0;
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if (flctx == NULL)
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goto out;
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list = &flctx->flc_posix;
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spin_lock(&flctx->flc_lock);
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restart:
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list_for_each_entry(fl, list, fl_list) {
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if (nfs_file_open_context(fl->fl_file)->state != state)
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continue;
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spin_unlock(&flctx->flc_lock);
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status = nfs4_lock_delegation_recall(fl, state, stateid);
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if (status < 0)
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goto out;
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spin_lock(&flctx->flc_lock);
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}
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if (list == &flctx->flc_posix) {
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list = &flctx->flc_flock;
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goto restart;
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}
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spin_unlock(&flctx->flc_lock);
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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,
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const nfs4_stateid *stateid, fmode_t type)
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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_owner *sp;
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struct nfs4_state *state;
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unsigned int seq;
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int err;
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again:
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rcu_read_lock();
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list_for_each_entry_rcu(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 (!nfs4_valid_open_stateid(state))
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continue;
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if (!nfs4_stateid_match(&state->stateid, stateid))
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continue;
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if (!get_nfs_open_context(ctx))
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continue;
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rcu_read_unlock();
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sp = state->owner;
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/* Block nfs4_proc_unlck */
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mutex_lock(&sp->so_delegreturn_mutex);
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seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
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err = nfs4_open_delegation_recall(ctx, state, stateid, type);
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if (!err)
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err = nfs_delegation_claim_locks(state, stateid);
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if (!err && read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
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err = -EAGAIN;
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mutex_unlock(&sp->so_delegreturn_mutex);
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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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rcu_read_unlock();
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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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* @type: delegation type
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* @stateid: delegation stateid
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* @pagemod_limit: write delegation "space_limit"
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*
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*/
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void nfs_inode_reclaim_delegation(struct inode *inode, const struct cred *cred,
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fmode_t type,
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const nfs4_stateid *stateid,
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unsigned long pagemod_limit)
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{
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struct nfs_delegation *delegation;
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const struct 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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nfs4_stateid_copy(&delegation->stateid, stateid);
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delegation->type = type;
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delegation->pagemod_limit = pagemod_limit;
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oldcred = delegation->cred;
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delegation->cred = get_cred(cred);
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clear_bit(NFS_DELEGATION_NEED_RECLAIM,
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&delegation->flags);
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spin_unlock(&delegation->lock);
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rcu_read_unlock();
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put_cred(oldcred);
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trace_nfs4_reclaim_delegation(inode, type);
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return;
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}
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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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}
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rcu_read_unlock();
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nfs_inode_set_delegation(inode, cred, type, stateid, pagemod_limit);
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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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if (!test_bit(NFS_DELEGATION_REVOKED, &delegation->flags))
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res = nfs4_proc_delegreturn(inode,
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delegation->cred,
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&delegation->stateid,
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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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if (!inode)
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set_bit(NFS_DELEGATION_INODE_FREEING, &delegation->flags);
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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_start_delegation_return_locked(struct nfs_inode *nfsi)
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{
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struct nfs_delegation *ret = NULL;
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struct nfs_delegation *delegation = rcu_dereference(nfsi->delegation);
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if (delegation == NULL)
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goto out;
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spin_lock(&delegation->lock);
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if (!test_and_set_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
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ret = delegation;
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spin_unlock(&delegation->lock);
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out:
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return ret;
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}
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static struct nfs_delegation *
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nfs_start_delegation_return(struct nfs_inode *nfsi)
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{
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struct nfs_delegation *delegation;
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rcu_read_lock();
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delegation = nfs_start_delegation_return_locked(nfsi);
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rcu_read_unlock();
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return delegation;
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}
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static void
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nfs_abort_delegation_return(struct nfs_delegation *delegation,
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struct nfs_client *clp)
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{
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spin_lock(&delegation->lock);
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clear_bit(NFS_DELEGATION_RETURNING, &delegation->flags);
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set_bit(NFS_DELEGATION_RETURN, &delegation->flags);
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spin_unlock(&delegation->lock);
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set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state);
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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_delegation *delegation,
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struct nfs_client *clp)
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{
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struct nfs_delegation *deleg_cur =
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rcu_dereference_protected(nfsi->delegation,
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lockdep_is_held(&clp->cl_lock));
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if (deleg_cur == NULL || delegation != deleg_cur)
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return NULL;
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spin_lock(&delegation->lock);
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set_bit(NFS_DELEGATION_RETURNING, &delegation->flags);
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list_del_rcu(&delegation->super_list);
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delegation->inode = NULL;
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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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}
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static struct nfs_delegation *nfs_detach_delegation(struct nfs_inode *nfsi,
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struct nfs_delegation *delegation,
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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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spin_lock(&clp->cl_lock);
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delegation = nfs_detach_delegation_locked(nfsi, delegation, clp);
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spin_unlock(&clp->cl_lock);
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return delegation;
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}
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static struct nfs_delegation *
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nfs_inode_detach_delegation(struct inode *inode)
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{
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struct nfs_inode *nfsi = NFS_I(inode);
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struct nfs_server *server = NFS_SERVER(inode);
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struct nfs_delegation *delegation;
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delegation = nfs_start_delegation_return(nfsi);
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if (delegation == NULL)
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return NULL;
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return nfs_detach_delegation(nfsi, delegation, server);
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}
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static void
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nfs_update_inplace_delegation(struct nfs_delegation *delegation,
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const struct nfs_delegation *update)
|
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{
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if (nfs4_stateid_is_newer(&update->stateid, &delegation->stateid)) {
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delegation->stateid.seqid = update->stateid.seqid;
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smp_wmb();
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delegation->type = update->type;
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}
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}
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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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* @type: delegation type
|
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* @stateid: delegation stateid
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* @pagemod_limit: write delegation "space_limit"
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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, const struct cred *cred,
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fmode_t type,
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const nfs4_stateid *stateid,
|
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unsigned long pagemod_limit)
|
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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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nfs4_stateid_copy(&delegation->stateid, stateid);
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delegation->type = type;
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delegation->pagemod_limit = pagemod_limit;
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delegation->change_attr = inode_peek_iversion_raw(inode);
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delegation->cred = get_cred(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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|
|
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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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/* Is this an update of the existing delegation? */
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if (nfs4_stateid_match_other(&old_delegation->stateid,
|
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&delegation->stateid)) {
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nfs_update_inplace_delegation(old_delegation,
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delegation);
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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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* Allow for upgrades to a WRITE delegation, but
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* nothing else.
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*/
|
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dfprintk(FILE, "%s: server %s handed out "
|
|
"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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!(delegation->type & FMODE_WRITE)) {
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freeme = delegation;
|
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delegation = NULL;
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goto out;
|
|
}
|
|
if (test_and_set_bit(NFS_DELEGATION_RETURNING,
|
|
&old_delegation->flags))
|
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goto out;
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|
freeme = nfs_detach_delegation_locked(nfsi,
|
|
old_delegation, clp);
|
|
if (freeme == NULL)
|
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goto out;
|
|
}
|
|
list_add_tail_rcu(&delegation->super_list, &server->delegations);
|
|
rcu_assign_pointer(nfsi->delegation, delegation);
|
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delegation = NULL;
|
|
|
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trace_nfs4_set_delegation(inode, type);
|
|
|
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spin_lock(&inode->i_lock);
|
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if (NFS_I(inode)->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME))
|
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NFS_I(inode)->cache_validity |= NFS_INO_REVAL_FORCED;
|
|
spin_unlock(&inode->i_lock);
|
|
out:
|
|
spin_unlock(&clp->cl_lock);
|
|
if (delegation != NULL)
|
|
nfs_free_delegation(delegation);
|
|
if (freeme != NULL)
|
|
nfs_do_return_delegation(inode, freeme, 0);
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* Basic procedure for returning a delegation to the server
|
|
*/
|
|
static int nfs_end_delegation_return(struct inode *inode, struct nfs_delegation *delegation, int issync)
|
|
{
|
|
struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
int err = 0;
|
|
|
|
if (delegation == NULL)
|
|
return 0;
|
|
do {
|
|
if (test_bit(NFS_DELEGATION_REVOKED, &delegation->flags))
|
|
break;
|
|
err = nfs_delegation_claim_opens(inode, &delegation->stateid,
|
|
delegation->type);
|
|
if (!issync || err != -EAGAIN)
|
|
break;
|
|
/*
|
|
* Guard against state recovery
|
|
*/
|
|
err = nfs4_wait_clnt_recover(clp);
|
|
} while (err == 0);
|
|
|
|
if (err) {
|
|
nfs_abort_delegation_return(delegation, clp);
|
|
goto out;
|
|
}
|
|
if (!nfs_detach_delegation(nfsi, delegation, NFS_SERVER(inode)))
|
|
goto out;
|
|
|
|
err = nfs_do_return_delegation(inode, delegation, issync);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static bool nfs_delegation_need_return(struct nfs_delegation *delegation)
|
|
{
|
|
bool ret = false;
|
|
|
|
if (test_bit(NFS_DELEGATION_RETURNING, &delegation->flags))
|
|
goto out;
|
|
if (test_and_clear_bit(NFS_DELEGATION_RETURN, &delegation->flags))
|
|
ret = true;
|
|
if (test_and_clear_bit(NFS_DELEGATION_RETURN_IF_CLOSED, &delegation->flags) && !ret) {
|
|
struct inode *inode;
|
|
|
|
spin_lock(&delegation->lock);
|
|
inode = delegation->inode;
|
|
if (inode && list_empty(&NFS_I(inode)->open_files))
|
|
ret = true;
|
|
spin_unlock(&delegation->lock);
|
|
}
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* nfs_client_return_marked_delegations - return previously marked delegations
|
|
* @clp: nfs_client to process
|
|
*
|
|
* Note that this function is designed to be called by the state
|
|
* manager thread. For this reason, it cannot flush the dirty data,
|
|
* since that could deadlock in case of a state recovery error.
|
|
*
|
|
* Returns zero on success, or a negative errno value.
|
|
*/
|
|
int nfs_client_return_marked_delegations(struct nfs_client *clp)
|
|
{
|
|
struct nfs_delegation *delegation;
|
|
struct nfs_delegation *prev;
|
|
struct nfs_server *server;
|
|
struct inode *inode;
|
|
struct inode *place_holder = NULL;
|
|
struct nfs_delegation *place_holder_deleg = NULL;
|
|
int err = 0;
|
|
|
|
restart:
|
|
/*
|
|
* To avoid quadratic looping we hold a reference
|
|
* to an inode place_holder. Each time we restart, we
|
|
* list nfs_servers from the server of that inode, and
|
|
* delegation in the server from the delegations of that
|
|
* inode.
|
|
* prev is an RCU-protected pointer to a delegation which
|
|
* wasn't marked for return and might be a good choice for
|
|
* the next place_holder.
|
|
*/
|
|
rcu_read_lock();
|
|
prev = NULL;
|
|
if (place_holder)
|
|
server = NFS_SERVER(place_holder);
|
|
else
|
|
server = list_entry_rcu(clp->cl_superblocks.next,
|
|
struct nfs_server, client_link);
|
|
list_for_each_entry_from_rcu(server, &clp->cl_superblocks, client_link) {
|
|
delegation = NULL;
|
|
if (place_holder && server == NFS_SERVER(place_holder))
|
|
delegation = rcu_dereference(NFS_I(place_holder)->delegation);
|
|
if (!delegation || delegation != place_holder_deleg)
|
|
delegation = list_entry_rcu(server->delegations.next,
|
|
struct nfs_delegation, super_list);
|
|
list_for_each_entry_from_rcu(delegation, &server->delegations, super_list) {
|
|
struct inode *to_put = NULL;
|
|
|
|
if (!nfs_delegation_need_return(delegation)) {
|
|
prev = delegation;
|
|
continue;
|
|
}
|
|
if (!nfs_sb_active(server->super))
|
|
break; /* continue in outer loop */
|
|
|
|
if (prev) {
|
|
struct inode *tmp;
|
|
|
|
tmp = nfs_delegation_grab_inode(prev);
|
|
if (tmp) {
|
|
to_put = place_holder;
|
|
place_holder = tmp;
|
|
place_holder_deleg = prev;
|
|
}
|
|
}
|
|
|
|
inode = nfs_delegation_grab_inode(delegation);
|
|
if (inode == NULL) {
|
|
rcu_read_unlock();
|
|
if (to_put)
|
|
iput(to_put);
|
|
nfs_sb_deactive(server->super);
|
|
goto restart;
|
|
}
|
|
delegation = nfs_start_delegation_return_locked(NFS_I(inode));
|
|
rcu_read_unlock();
|
|
|
|
if (to_put)
|
|
iput(to_put);
|
|
|
|
err = nfs_end_delegation_return(inode, delegation, 0);
|
|
iput(inode);
|
|
nfs_sb_deactive(server->super);
|
|
cond_resched();
|
|
if (!err)
|
|
goto restart;
|
|
set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state);
|
|
if (place_holder)
|
|
iput(place_holder);
|
|
return err;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
if (place_holder)
|
|
iput(place_holder);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* nfs_inode_return_delegation_noreclaim - return delegation, don't reclaim opens
|
|
* @inode: inode to process
|
|
*
|
|
* Does not protect against delegation reclaims, therefore really only safe
|
|
* to be called from nfs4_clear_inode().
|
|
*/
|
|
void nfs_inode_return_delegation_noreclaim(struct inode *inode)
|
|
{
|
|
struct nfs_delegation *delegation;
|
|
|
|
delegation = nfs_inode_detach_delegation(inode);
|
|
if (delegation != NULL)
|
|
nfs_do_return_delegation(inode, delegation, 1);
|
|
}
|
|
|
|
/**
|
|
* nfs_inode_return_delegation - synchronously return a delegation
|
|
* @inode: inode to process
|
|
*
|
|
* This routine will always flush any dirty data to disk on the
|
|
* assumption that if we need to return the delegation, then
|
|
* we should stop caching.
|
|
*
|
|
* Returns zero on success, or a negative errno value.
|
|
*/
|
|
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);
|
|
if (delegation != NULL)
|
|
err = nfs_end_delegation_return(inode, delegation, 1);
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* nfs4_inode_make_writeable
|
|
* @inode: pointer to inode
|
|
*
|
|
* Make the inode writeable by returning the delegation if necessary
|
|
*
|
|
* Returns zero on success, or a negative errno value.
|
|
*/
|
|
int nfs4_inode_make_writeable(struct inode *inode)
|
|
{
|
|
if (!nfs4_has_session(NFS_SERVER(inode)->nfs_client) ||
|
|
!nfs4_check_delegation(inode, FMODE_WRITE))
|
|
return nfs4_inode_return_delegation(inode);
|
|
return 0;
|
|
}
|
|
|
|
static void nfs_mark_return_if_closed_delegation(struct nfs_server *server,
|
|
struct nfs_delegation *delegation)
|
|
{
|
|
set_bit(NFS_DELEGATION_RETURN_IF_CLOSED, &delegation->flags);
|
|
set_bit(NFS4CLNT_DELEGRETURN, &server->nfs_client->cl_state);
|
|
}
|
|
|
|
static void nfs_mark_return_delegation(struct nfs_server *server,
|
|
struct nfs_delegation *delegation)
|
|
{
|
|
set_bit(NFS_DELEGATION_RETURN, &delegation->flags);
|
|
set_bit(NFS4CLNT_DELEGRETURN, &server->nfs_client->cl_state);
|
|
}
|
|
|
|
static bool nfs_server_mark_return_all_delegations(struct nfs_server *server)
|
|
{
|
|
struct nfs_delegation *delegation;
|
|
bool ret = false;
|
|
|
|
list_for_each_entry_rcu(delegation, &server->delegations, super_list) {
|
|
nfs_mark_return_delegation(server, delegation);
|
|
ret = true;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static void nfs_client_mark_return_all_delegations(struct nfs_client *clp)
|
|
{
|
|
struct nfs_server *server;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
|
|
nfs_server_mark_return_all_delegations(server);
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
static void nfs_delegation_run_state_manager(struct nfs_client *clp)
|
|
{
|
|
if (test_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state))
|
|
nfs4_schedule_state_manager(clp);
|
|
}
|
|
|
|
/**
|
|
* nfs_expire_all_delegations
|
|
* @clp: client to process
|
|
*
|
|
*/
|
|
void nfs_expire_all_delegations(struct nfs_client *clp)
|
|
{
|
|
nfs_client_mark_return_all_delegations(clp);
|
|
nfs_delegation_run_state_manager(clp);
|
|
}
|
|
|
|
/**
|
|
* nfs_super_return_all_delegations - return delegations for one superblock
|
|
* @server: pointer to nfs_server to process
|
|
*
|
|
*/
|
|
void nfs_server_return_all_delegations(struct nfs_server *server)
|
|
{
|
|
struct nfs_client *clp = server->nfs_client;
|
|
bool need_wait;
|
|
|
|
if (clp == NULL)
|
|
return;
|
|
|
|
rcu_read_lock();
|
|
need_wait = nfs_server_mark_return_all_delegations(server);
|
|
rcu_read_unlock();
|
|
|
|
if (need_wait) {
|
|
nfs4_schedule_state_manager(clp);
|
|
nfs4_wait_clnt_recover(clp);
|
|
}
|
|
}
|
|
|
|
static void nfs_mark_return_unused_delegation_types(struct nfs_server *server,
|
|
fmode_t flags)
|
|
{
|
|
struct nfs_delegation *delegation;
|
|
|
|
list_for_each_entry_rcu(delegation, &server->delegations, super_list) {
|
|
if ((delegation->type == (FMODE_READ|FMODE_WRITE)) && !(flags & FMODE_WRITE))
|
|
continue;
|
|
if (delegation->type & flags)
|
|
nfs_mark_return_if_closed_delegation(server, delegation);
|
|
}
|
|
}
|
|
|
|
static void nfs_client_mark_return_unused_delegation_types(struct nfs_client *clp,
|
|
fmode_t flags)
|
|
{
|
|
struct nfs_server *server;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
|
|
nfs_mark_return_unused_delegation_types(server, flags);
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
static void nfs_mark_delegation_revoked(struct nfs_server *server,
|
|
struct nfs_delegation *delegation)
|
|
{
|
|
set_bit(NFS_DELEGATION_REVOKED, &delegation->flags);
|
|
delegation->stateid.type = NFS4_INVALID_STATEID_TYPE;
|
|
nfs_mark_return_delegation(server, delegation);
|
|
}
|
|
|
|
static bool nfs_revoke_delegation(struct inode *inode,
|
|
const nfs4_stateid *stateid)
|
|
{
|
|
struct nfs_delegation *delegation;
|
|
nfs4_stateid tmp;
|
|
bool ret = false;
|
|
|
|
rcu_read_lock();
|
|
delegation = rcu_dereference(NFS_I(inode)->delegation);
|
|
if (delegation == NULL)
|
|
goto out;
|
|
if (stateid == NULL) {
|
|
nfs4_stateid_copy(&tmp, &delegation->stateid);
|
|
stateid = &tmp;
|
|
} else if (!nfs4_stateid_match(stateid, &delegation->stateid))
|
|
goto out;
|
|
nfs_mark_delegation_revoked(NFS_SERVER(inode), delegation);
|
|
ret = true;
|
|
out:
|
|
rcu_read_unlock();
|
|
if (ret)
|
|
nfs_inode_find_state_and_recover(inode, stateid);
|
|
return ret;
|
|
}
|
|
|
|
void nfs_remove_bad_delegation(struct inode *inode,
|
|
const nfs4_stateid *stateid)
|
|
{
|
|
struct nfs_delegation *delegation;
|
|
|
|
if (!nfs_revoke_delegation(inode, stateid))
|
|
return;
|
|
delegation = nfs_inode_detach_delegation(inode);
|
|
if (delegation)
|
|
nfs_free_delegation(delegation);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs_remove_bad_delegation);
|
|
|
|
/**
|
|
* nfs_expire_unused_delegation_types
|
|
* @clp: client to process
|
|
* @flags: delegation types to expire
|
|
*
|
|
*/
|
|
void nfs_expire_unused_delegation_types(struct nfs_client *clp, fmode_t flags)
|
|
{
|
|
nfs_client_mark_return_unused_delegation_types(clp, flags);
|
|
nfs_delegation_run_state_manager(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_if_closed_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
|
|
*
|
|
* 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 (delegation == NULL)
|
|
goto out_enoent;
|
|
if (stateid != NULL &&
|
|
!clp->cl_mvops->match_stateid(&delegation->stateid, stateid))
|
|
goto out_enoent;
|
|
nfs_mark_return_delegation(server, delegation);
|
|
rcu_read_unlock();
|
|
|
|
nfs_delegation_run_state_manager(clp);
|
|
return 0;
|
|
out_enoent:
|
|
rcu_read_unlock();
|
|
return -ENOENT;
|
|
}
|
|
|
|
static struct inode *
|
|
nfs_delegation_find_inode_server(struct nfs_server *server,
|
|
const struct nfs_fh *fhandle)
|
|
{
|
|
struct nfs_delegation *delegation;
|
|
struct inode *freeme, *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) {
|
|
freeme = igrab(delegation->inode);
|
|
if (freeme && nfs_sb_active(freeme->i_sb))
|
|
res = freeme;
|
|
spin_unlock(&delegation->lock);
|
|
if (res != NULL)
|
|
return res;
|
|
if (freeme) {
|
|
rcu_read_unlock();
|
|
iput(freeme);
|
|
rcu_read_lock();
|
|
}
|
|
return ERR_PTR(-EAGAIN);
|
|
}
|
|
spin_unlock(&delegation->lock);
|
|
}
|
|
return ERR_PTR(-ENOENT);
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
|
|
res = nfs_delegation_find_inode_server(server, fhandle);
|
|
if (res != ERR_PTR(-ENOENT)) {
|
|
rcu_read_unlock();
|
|
return res;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
return ERR_PTR(-ENOENT);
|
|
}
|
|
|
|
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) {
|
|
/*
|
|
* If the delegation may have been admin revoked, then we
|
|
* cannot reclaim it.
|
|
*/
|
|
if (test_bit(NFS_DELEGATION_TEST_EXPIRED, &delegation->flags))
|
|
continue;
|
|
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_INODE_FREEING,
|
|
&delegation->flags) ||
|
|
test_bit(NFS_DELEGATION_RETURNING,
|
|
&delegation->flags) ||
|
|
test_bit(NFS_DELEGATION_NEED_RECLAIM,
|
|
&delegation->flags) == 0)
|
|
continue;
|
|
if (!nfs_sb_active(server->super))
|
|
break; /* continue in outer loop */
|
|
inode = nfs_delegation_grab_inode(delegation);
|
|
if (inode == NULL) {
|
|
rcu_read_unlock();
|
|
nfs_sb_deactive(server->super);
|
|
goto restart;
|
|
}
|
|
delegation = nfs_start_delegation_return_locked(NFS_I(inode));
|
|
rcu_read_unlock();
|
|
if (delegation != NULL) {
|
|
delegation = nfs_detach_delegation(NFS_I(inode),
|
|
delegation, server);
|
|
if (delegation != NULL)
|
|
nfs_free_delegation(delegation);
|
|
}
|
|
iput(inode);
|
|
nfs_sb_deactive(server->super);
|
|
cond_resched();
|
|
goto restart;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
static inline bool nfs4_server_rebooted(const struct nfs_client *clp)
|
|
{
|
|
return (clp->cl_state & (BIT(NFS4CLNT_CHECK_LEASE) |
|
|
BIT(NFS4CLNT_LEASE_EXPIRED) |
|
|
BIT(NFS4CLNT_SESSION_RESET))) != 0;
|
|
}
|
|
|
|
static void nfs_mark_test_expired_delegation(struct nfs_server *server,
|
|
struct nfs_delegation *delegation)
|
|
{
|
|
if (delegation->stateid.type == NFS4_INVALID_STATEID_TYPE)
|
|
return;
|
|
clear_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags);
|
|
set_bit(NFS_DELEGATION_TEST_EXPIRED, &delegation->flags);
|
|
set_bit(NFS4CLNT_DELEGATION_EXPIRED, &server->nfs_client->cl_state);
|
|
}
|
|
|
|
static void nfs_inode_mark_test_expired_delegation(struct nfs_server *server,
|
|
struct inode *inode)
|
|
{
|
|
struct nfs_delegation *delegation;
|
|
|
|
rcu_read_lock();
|
|
delegation = rcu_dereference(NFS_I(inode)->delegation);
|
|
if (delegation)
|
|
nfs_mark_test_expired_delegation(server, delegation);
|
|
rcu_read_unlock();
|
|
|
|
}
|
|
|
|
static void nfs_delegation_mark_test_expired_server(struct nfs_server *server)
|
|
{
|
|
struct nfs_delegation *delegation;
|
|
|
|
list_for_each_entry_rcu(delegation, &server->delegations, super_list)
|
|
nfs_mark_test_expired_delegation(server, delegation);
|
|
}
|
|
|
|
/**
|
|
* nfs_mark_test_expired_all_delegations - mark all delegations for testing
|
|
* @clp: nfs_client to process
|
|
*
|
|
* Iterates through all the delegations associated with this server and
|
|
* marks them as needing to be checked for validity.
|
|
*/
|
|
void nfs_mark_test_expired_all_delegations(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_test_expired_server(server);
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
/**
|
|
* nfs_reap_expired_delegations - reap expired delegations
|
|
* @clp: nfs_client to process
|
|
*
|
|
* Iterates through all the delegations associated with this server and
|
|
* checks if they have may have been revoked. This function is usually
|
|
* expected to be called in cases where the server may have lost its
|
|
* lease.
|
|
*/
|
|
void nfs_reap_expired_delegations(struct nfs_client *clp)
|
|
{
|
|
const struct nfs4_minor_version_ops *ops = clp->cl_mvops;
|
|
struct nfs_delegation *delegation;
|
|
struct nfs_server *server;
|
|
struct inode *inode;
|
|
const struct cred *cred;
|
|
nfs4_stateid stateid;
|
|
|
|
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_INODE_FREEING,
|
|
&delegation->flags) ||
|
|
test_bit(NFS_DELEGATION_RETURNING,
|
|
&delegation->flags) ||
|
|
test_bit(NFS_DELEGATION_TEST_EXPIRED,
|
|
&delegation->flags) == 0)
|
|
continue;
|
|
if (!nfs_sb_active(server->super))
|
|
break; /* continue in outer loop */
|
|
inode = nfs_delegation_grab_inode(delegation);
|
|
if (inode == NULL) {
|
|
rcu_read_unlock();
|
|
nfs_sb_deactive(server->super);
|
|
goto restart;
|
|
}
|
|
cred = get_cred_rcu(delegation->cred);
|
|
nfs4_stateid_copy(&stateid, &delegation->stateid);
|
|
clear_bit(NFS_DELEGATION_TEST_EXPIRED, &delegation->flags);
|
|
rcu_read_unlock();
|
|
if (cred != NULL &&
|
|
ops->test_and_free_expired(server, &stateid, cred) < 0) {
|
|
nfs_revoke_delegation(inode, &stateid);
|
|
nfs_inode_find_state_and_recover(inode, &stateid);
|
|
}
|
|
put_cred(cred);
|
|
if (nfs4_server_rebooted(clp)) {
|
|
nfs_inode_mark_test_expired_delegation(server,inode);
|
|
iput(inode);
|
|
nfs_sb_deactive(server->super);
|
|
return;
|
|
}
|
|
iput(inode);
|
|
nfs_sb_deactive(server->super);
|
|
cond_resched();
|
|
goto restart;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
void nfs_inode_find_delegation_state_and_recover(struct inode *inode,
|
|
const nfs4_stateid *stateid)
|
|
{
|
|
struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
|
|
struct nfs_delegation *delegation;
|
|
bool found = false;
|
|
|
|
rcu_read_lock();
|
|
delegation = rcu_dereference(NFS_I(inode)->delegation);
|
|
if (delegation &&
|
|
nfs4_stateid_match_other(&delegation->stateid, stateid)) {
|
|
nfs_mark_test_expired_delegation(NFS_SERVER(inode), delegation);
|
|
found = true;
|
|
}
|
|
rcu_read_unlock();
|
|
if (found)
|
|
nfs4_schedule_state_manager(clp);
|
|
}
|
|
|
|
/**
|
|
* 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_refresh_delegation_stateid - Update delegation stateid seqid
|
|
* @dst: stateid to refresh
|
|
* @inode: inode to check
|
|
*
|
|
* Returns "true" and updates "dst->seqid" * if inode had a delegation
|
|
* that matches our delegation stateid. Otherwise "false" is returned.
|
|
*/
|
|
bool nfs4_refresh_delegation_stateid(nfs4_stateid *dst, struct inode *inode)
|
|
{
|
|
struct nfs_delegation *delegation;
|
|
bool ret = false;
|
|
if (!inode)
|
|
goto out;
|
|
|
|
rcu_read_lock();
|
|
delegation = rcu_dereference(NFS_I(inode)->delegation);
|
|
if (delegation != NULL &&
|
|
nfs4_stateid_match_other(dst, &delegation->stateid)) {
|
|
dst->seqid = delegation->stateid.seqid;
|
|
return ret;
|
|
}
|
|
rcu_read_unlock();
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* nfs4_copy_delegation_stateid - Copy inode's state ID information
|
|
* @inode: inode to check
|
|
* @flags: delegation type requirement
|
|
* @dst: stateid data structure to fill in
|
|
* @cred: optional argument to retrieve credential
|
|
*
|
|
* Returns "true" and fills in "dst->data" * if inode had a delegation,
|
|
* otherwise "false" is returned.
|
|
*/
|
|
bool nfs4_copy_delegation_stateid(struct inode *inode, fmode_t flags,
|
|
nfs4_stateid *dst, const struct cred **cred)
|
|
{
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
struct nfs_delegation *delegation;
|
|
bool ret;
|
|
|
|
flags &= FMODE_READ|FMODE_WRITE;
|
|
rcu_read_lock();
|
|
delegation = rcu_dereference(nfsi->delegation);
|
|
ret = nfs4_is_valid_delegation(delegation, flags);
|
|
if (ret) {
|
|
nfs4_stateid_copy(dst, &delegation->stateid);
|
|
nfs_mark_delegation_referenced(delegation);
|
|
if (cred)
|
|
*cred = get_cred(delegation->cred);
|
|
}
|
|
rcu_read_unlock();
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* nfs4_delegation_flush_on_close - Check if we must flush file on close
|
|
* @inode: inode to check
|
|
*
|
|
* This function checks the number of outstanding writes to the file
|
|
* against the delegation 'space_limit' field to see if
|
|
* the spec requires us to flush the file on close.
|
|
*/
|
|
bool nfs4_delegation_flush_on_close(const struct inode *inode)
|
|
{
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
struct nfs_delegation *delegation;
|
|
bool ret = true;
|
|
|
|
rcu_read_lock();
|
|
delegation = rcu_dereference(nfsi->delegation);
|
|
if (delegation == NULL || !(delegation->type & FMODE_WRITE))
|
|
goto out;
|
|
if (atomic_long_read(&nfsi->nrequests) < delegation->pagemod_limit)
|
|
ret = false;
|
|
out:
|
|
rcu_read_unlock();
|
|
return ret;
|
|
}
|