1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
342 lines
8.5 KiB
C
342 lines
8.5 KiB
C
/*
|
|
* linux/fs/nfs/delegation.c
|
|
*
|
|
* Copyright (C) 2004 Trond Myklebust
|
|
*
|
|
* NFS file delegation management
|
|
*
|
|
*/
|
|
#include <linux/config.h>
|
|
#include <linux/completion.h>
|
|
#include <linux/module.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/spinlock.h>
|
|
|
|
#include <linux/nfs4.h>
|
|
#include <linux/nfs_fs.h>
|
|
#include <linux/nfs_xdr.h>
|
|
|
|
#include "delegation.h"
|
|
|
|
static struct nfs_delegation *nfs_alloc_delegation(void)
|
|
{
|
|
return (struct nfs_delegation *)kmalloc(sizeof(struct nfs_delegation), GFP_KERNEL);
|
|
}
|
|
|
|
static void nfs_free_delegation(struct nfs_delegation *delegation)
|
|
{
|
|
if (delegation->cred)
|
|
put_rpccred(delegation->cred);
|
|
kfree(delegation);
|
|
}
|
|
|
|
static void nfs_delegation_claim_opens(struct inode *inode)
|
|
{
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
struct nfs_open_context *ctx;
|
|
struct nfs4_state *state;
|
|
|
|
again:
|
|
spin_lock(&inode->i_lock);
|
|
list_for_each_entry(ctx, &nfsi->open_files, list) {
|
|
state = ctx->state;
|
|
if (state == NULL)
|
|
continue;
|
|
if (!test_bit(NFS_DELEGATED_STATE, &state->flags))
|
|
continue;
|
|
get_nfs_open_context(ctx);
|
|
spin_unlock(&inode->i_lock);
|
|
if (nfs4_open_delegation_recall(ctx->dentry, state) < 0)
|
|
return;
|
|
put_nfs_open_context(ctx);
|
|
goto again;
|
|
}
|
|
spin_unlock(&inode->i_lock);
|
|
}
|
|
|
|
/*
|
|
* Set up a delegation on an inode
|
|
*/
|
|
void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res)
|
|
{
|
|
struct nfs_delegation *delegation = NFS_I(inode)->delegation;
|
|
|
|
if (delegation == NULL)
|
|
return;
|
|
memcpy(delegation->stateid.data, res->delegation.data,
|
|
sizeof(delegation->stateid.data));
|
|
delegation->type = res->delegation_type;
|
|
delegation->maxsize = res->maxsize;
|
|
put_rpccred(cred);
|
|
delegation->cred = get_rpccred(cred);
|
|
delegation->flags &= ~NFS_DELEGATION_NEED_RECLAIM;
|
|
NFS_I(inode)->delegation_state = delegation->type;
|
|
smp_wmb();
|
|
}
|
|
|
|
/*
|
|
* Set up a delegation on an inode
|
|
*/
|
|
int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res)
|
|
{
|
|
struct nfs4_client *clp = NFS_SERVER(inode)->nfs4_state;
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
struct nfs_delegation *delegation;
|
|
int status = 0;
|
|
|
|
delegation = nfs_alloc_delegation();
|
|
if (delegation == NULL)
|
|
return -ENOMEM;
|
|
memcpy(delegation->stateid.data, res->delegation.data,
|
|
sizeof(delegation->stateid.data));
|
|
delegation->type = res->delegation_type;
|
|
delegation->maxsize = res->maxsize;
|
|
delegation->cred = get_rpccred(cred);
|
|
delegation->inode = inode;
|
|
|
|
spin_lock(&clp->cl_lock);
|
|
if (nfsi->delegation == NULL) {
|
|
list_add(&delegation->super_list, &clp->cl_delegations);
|
|
nfsi->delegation = delegation;
|
|
nfsi->delegation_state = delegation->type;
|
|
delegation = NULL;
|
|
} else {
|
|
if (memcmp(&delegation->stateid, &nfsi->delegation->stateid,
|
|
sizeof(delegation->stateid)) != 0 ||
|
|
delegation->type != nfsi->delegation->type) {
|
|
printk("%s: server %u.%u.%u.%u, handed out a duplicate delegation!\n",
|
|
__FUNCTION__, NIPQUAD(clp->cl_addr));
|
|
status = -EIO;
|
|
}
|
|
}
|
|
spin_unlock(&clp->cl_lock);
|
|
if (delegation != NULL)
|
|
kfree(delegation);
|
|
return status;
|
|
}
|
|
|
|
static int nfs_do_return_delegation(struct inode *inode, struct nfs_delegation *delegation)
|
|
{
|
|
int res = 0;
|
|
|
|
__nfs_revalidate_inode(NFS_SERVER(inode), inode);
|
|
|
|
res = nfs4_proc_delegreturn(inode, delegation->cred, &delegation->stateid);
|
|
nfs_free_delegation(delegation);
|
|
return res;
|
|
}
|
|
|
|
/* Sync all data to disk upon delegation return */
|
|
static void nfs_msync_inode(struct inode *inode)
|
|
{
|
|
filemap_fdatawrite(inode->i_mapping);
|
|
nfs_wb_all(inode);
|
|
filemap_fdatawait(inode->i_mapping);
|
|
}
|
|
|
|
/*
|
|
* Basic procedure for returning a delegation to the server
|
|
*/
|
|
int nfs_inode_return_delegation(struct inode *inode)
|
|
{
|
|
struct nfs4_client *clp = NFS_SERVER(inode)->nfs4_state;
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
struct nfs_delegation *delegation;
|
|
int res = 0;
|
|
|
|
nfs_msync_inode(inode);
|
|
down_read(&clp->cl_sem);
|
|
/* Guard against new delegated open calls */
|
|
down_write(&nfsi->rwsem);
|
|
spin_lock(&clp->cl_lock);
|
|
delegation = nfsi->delegation;
|
|
if (delegation != NULL) {
|
|
list_del_init(&delegation->super_list);
|
|
nfsi->delegation = NULL;
|
|
nfsi->delegation_state = 0;
|
|
}
|
|
spin_unlock(&clp->cl_lock);
|
|
nfs_delegation_claim_opens(inode);
|
|
up_write(&nfsi->rwsem);
|
|
up_read(&clp->cl_sem);
|
|
nfs_msync_inode(inode);
|
|
|
|
if (delegation != NULL)
|
|
res = nfs_do_return_delegation(inode, delegation);
|
|
return res;
|
|
}
|
|
|
|
/*
|
|
* Return all delegations associated to a super block
|
|
*/
|
|
void nfs_return_all_delegations(struct super_block *sb)
|
|
{
|
|
struct nfs4_client *clp = NFS_SB(sb)->nfs4_state;
|
|
struct nfs_delegation *delegation;
|
|
struct inode *inode;
|
|
|
|
if (clp == NULL)
|
|
return;
|
|
restart:
|
|
spin_lock(&clp->cl_lock);
|
|
list_for_each_entry(delegation, &clp->cl_delegations, super_list) {
|
|
if (delegation->inode->i_sb != sb)
|
|
continue;
|
|
inode = igrab(delegation->inode);
|
|
if (inode == NULL)
|
|
continue;
|
|
spin_unlock(&clp->cl_lock);
|
|
nfs_inode_return_delegation(inode);
|
|
iput(inode);
|
|
goto restart;
|
|
}
|
|
spin_unlock(&clp->cl_lock);
|
|
}
|
|
|
|
/*
|
|
* Return all delegations following an NFS4ERR_CB_PATH_DOWN error.
|
|
*/
|
|
void nfs_handle_cb_pathdown(struct nfs4_client *clp)
|
|
{
|
|
struct nfs_delegation *delegation;
|
|
struct inode *inode;
|
|
|
|
if (clp == NULL)
|
|
return;
|
|
restart:
|
|
spin_lock(&clp->cl_lock);
|
|
list_for_each_entry(delegation, &clp->cl_delegations, super_list) {
|
|
inode = igrab(delegation->inode);
|
|
if (inode == NULL)
|
|
continue;
|
|
spin_unlock(&clp->cl_lock);
|
|
nfs_inode_return_delegation(inode);
|
|
iput(inode);
|
|
goto restart;
|
|
}
|
|
spin_unlock(&clp->cl_lock);
|
|
}
|
|
|
|
struct recall_threadargs {
|
|
struct inode *inode;
|
|
struct nfs4_client *clp;
|
|
const nfs4_stateid *stateid;
|
|
|
|
struct completion started;
|
|
int result;
|
|
};
|
|
|
|
static int recall_thread(void *data)
|
|
{
|
|
struct recall_threadargs *args = (struct recall_threadargs *)data;
|
|
struct inode *inode = igrab(args->inode);
|
|
struct nfs4_client *clp = NFS_SERVER(inode)->nfs4_state;
|
|
struct nfs_inode *nfsi = NFS_I(inode);
|
|
struct nfs_delegation *delegation;
|
|
|
|
daemonize("nfsv4-delegreturn");
|
|
|
|
nfs_msync_inode(inode);
|
|
down_read(&clp->cl_sem);
|
|
down_write(&nfsi->rwsem);
|
|
spin_lock(&clp->cl_lock);
|
|
delegation = nfsi->delegation;
|
|
if (delegation != NULL && memcmp(delegation->stateid.data,
|
|
args->stateid->data,
|
|
sizeof(delegation->stateid.data)) == 0) {
|
|
list_del_init(&delegation->super_list);
|
|
nfsi->delegation = NULL;
|
|
nfsi->delegation_state = 0;
|
|
args->result = 0;
|
|
} else {
|
|
delegation = NULL;
|
|
args->result = -ENOENT;
|
|
}
|
|
spin_unlock(&clp->cl_lock);
|
|
complete(&args->started);
|
|
nfs_delegation_claim_opens(inode);
|
|
up_write(&nfsi->rwsem);
|
|
up_read(&clp->cl_sem);
|
|
nfs_msync_inode(inode);
|
|
|
|
if (delegation != NULL)
|
|
nfs_do_return_delegation(inode, delegation);
|
|
iput(inode);
|
|
module_put_and_exit(0);
|
|
}
|
|
|
|
/*
|
|
* Asynchronous delegation recall!
|
|
*/
|
|
int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *stateid)
|
|
{
|
|
struct recall_threadargs data = {
|
|
.inode = inode,
|
|
.stateid = stateid,
|
|
};
|
|
int status;
|
|
|
|
init_completion(&data.started);
|
|
__module_get(THIS_MODULE);
|
|
status = kernel_thread(recall_thread, &data, CLONE_KERNEL);
|
|
if (status < 0)
|
|
goto out_module_put;
|
|
wait_for_completion(&data.started);
|
|
return data.result;
|
|
out_module_put:
|
|
module_put(THIS_MODULE);
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* Retrieve the inode associated with a delegation
|
|
*/
|
|
struct inode *nfs_delegation_find_inode(struct nfs4_client *clp, const struct nfs_fh *fhandle)
|
|
{
|
|
struct nfs_delegation *delegation;
|
|
struct inode *res = NULL;
|
|
spin_lock(&clp->cl_lock);
|
|
list_for_each_entry(delegation, &clp->cl_delegations, super_list) {
|
|
if (nfs_compare_fh(fhandle, &NFS_I(delegation->inode)->fh) == 0) {
|
|
res = igrab(delegation->inode);
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock(&clp->cl_lock);
|
|
return res;
|
|
}
|
|
|
|
/*
|
|
* Mark all delegations as needing to be reclaimed
|
|
*/
|
|
void nfs_delegation_mark_reclaim(struct nfs4_client *clp)
|
|
{
|
|
struct nfs_delegation *delegation;
|
|
spin_lock(&clp->cl_lock);
|
|
list_for_each_entry(delegation, &clp->cl_delegations, super_list)
|
|
delegation->flags |= NFS_DELEGATION_NEED_RECLAIM;
|
|
spin_unlock(&clp->cl_lock);
|
|
}
|
|
|
|
/*
|
|
* Reap all unclaimed delegations after reboot recovery is done
|
|
*/
|
|
void nfs_delegation_reap_unclaimed(struct nfs4_client *clp)
|
|
{
|
|
struct nfs_delegation *delegation, *n;
|
|
LIST_HEAD(head);
|
|
spin_lock(&clp->cl_lock);
|
|
list_for_each_entry_safe(delegation, n, &clp->cl_delegations, super_list) {
|
|
if ((delegation->flags & NFS_DELEGATION_NEED_RECLAIM) == 0)
|
|
continue;
|
|
list_move(&delegation->super_list, &head);
|
|
NFS_I(delegation->inode)->delegation = NULL;
|
|
NFS_I(delegation->inode)->delegation_state = 0;
|
|
}
|
|
spin_unlock(&clp->cl_lock);
|
|
while(!list_empty(&head)) {
|
|
delegation = list_entry(head.next, struct nfs_delegation, super_list);
|
|
list_del(&delegation->super_list);
|
|
nfs_free_delegation(delegation);
|
|
}
|
|
}
|