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NFS: Move cl_delegations to the nfs_server struct 

Delegations are per-inode, not per-nfs_client.  When a server file
system is migrated, delegations on the client must be moved from the
source to the destination nfs_server.  Make it easier to manage a
mount point's delegation list across a migration event by moving the
list to the nfs_server struct.

Clean up: I added documenting comments to public functions I changed
in this patch.  For consistency I added comments to all the other
public functions in fs/nfs/delegation.c.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Chuck Lever 2010-12-24 01:33:04 +00:00 committed by Trond Myklebust
parent dda4b22562
commit d3978bb325
5 changed files with 251 additions and 93 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
fs/nfs/client.c
View File

@ -172,7 +172,6 @@ static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_
if (err)
goto error_cleanup;
INIT_LIST_HEAD(&clp->cl_delegations);
spin_lock_init(&clp->cl_lock);
INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
rpc_init_wait_queue(&clp->cl_rpcwaitq, "NFS client");
@ -1040,6 +1039,7 @@ static struct nfs_server *nfs_alloc_server(void)
/* Zero out the NFS state stuff */
INIT_LIST_HEAD(&server->client_link);
INIT_LIST_HEAD(&server->master_link);
INIT_LIST_HEAD(&server->delegations);
atomic_set(&server->active, 0);

337
fs/nfs/delegation.c
View File

@ -40,11 +40,23 @@ static void nfs_free_delegation(struct nfs_delegation *delegation)
call_rcu(&delegation->rcu, nfs_free_delegation_callback);
}
/**
* nfs_mark_delegation_referenced - set delegation's REFERENCED flag
* @delegation: delegation to process
*
*/
void nfs_mark_delegation_referenced(struct nfs_delegation *delegation)
{
set_bit(NFS_DELEGATION_REFERENCED, &delegation->flags);
}
/**
* nfs_have_delegation - check if inode has a delegation
* @inode: inode to check
* @flags: delegation types to check for
*
* Returns one if inode has the indicated delegation, otherwise zero.
*/
int nfs_have_delegation(struct inode *inode, fmode_t flags)
{
struct nfs_delegation *delegation;
@ -119,10 +131,15 @@ again:
return 0;
}
/*
* Set up a delegation on an inode
/**
* nfs_inode_reclaim_delegation - process a delegation reclaim request
* @inode: inode to process
* @cred: credential to use for request
* @res: new delegation state from server
*
*/
void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res)
void nfs_inode_reclaim_delegation(struct inode *inode, struct rpc_cred *cred,
struct nfs_openres *res)
{
struct nfs_delegation *delegation;
struct rpc_cred *oldcred = NULL;
@ -177,11 +194,11 @@ static struct inode *nfs_delegation_grab_inode(struct nfs_delegation *delegation
static struct nfs_delegation *
nfs_detach_delegation_locked(struct nfs_inode *nfsi,
struct nfs_client *clp)
struct nfs_server *server)
{
struct nfs_delegation *delegation =
rcu_dereference_protected(nfsi->delegation,
lockdep_is_held(&clp->cl_lock));
lockdep_is_held(&server->nfs_client->cl_lock));
if (delegation == NULL)
goto nomatch;
@ -198,22 +215,29 @@ nomatch:
}
static struct nfs_delegation *nfs_detach_delegation(struct nfs_inode *nfsi,
struct nfs_client *clp)
struct nfs_server *server)
{
struct nfs_client *clp = server->nfs_client;
struct nfs_delegation *delegation;
spin_lock(&clp->cl_lock);
delegation = nfs_detach_delegation_locked(nfsi, clp);
delegation = nfs_detach_delegation_locked(nfsi, server);
spin_unlock(&clp->cl_lock);
return delegation;
}
/*
* Set up a delegation on an inode
/**
* nfs_inode_set_delegation - set up a delegation on an inode
* @inode: inode to which delegation applies
* @cred: cred to use for subsequent delegation processing
* @res: new delegation state from server
*
* Returns zero on success, or a negative errno value.
*/
int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct nfs_openres *res)
{
struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
struct nfs_server *server = NFS_SERVER(inode);
struct nfs_client *clp = server->nfs_client;
struct nfs_inode *nfsi = NFS_I(inode);
struct nfs_delegation *delegation, *old_delegation;
struct nfs_delegation *freeme = NULL;
@ -234,7 +258,7 @@ int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct
spin_lock(&clp->cl_lock);
old_delegation = rcu_dereference_protected(nfsi->delegation,
lockdep_is_held(&clp->cl_lock));
lockdep_is_held(&clp->cl_lock));
if (old_delegation != NULL) {
if (memcmp(&delegation->stateid, &old_delegation->stateid,
sizeof(old_delegation->stateid)) == 0 &&
@ -253,9 +277,9 @@ int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct
delegation = NULL;
goto out;
}
freeme = nfs_detach_delegation_locked(nfsi, clp);
freeme = nfs_detach_delegation_locked(nfsi, server);
}
list_add_rcu(&delegation->super_list, &clp->cl_delegations);
list_add_rcu(&delegation->super_list, &server->delegations);
nfsi->delegation_state = delegation->type;
rcu_assign_pointer(nfsi->delegation, delegation);
delegation = NULL;
@ -297,67 +321,85 @@ out:
return err;
}
/*
* Return all delegations that have been marked for return
/**
* nfs_client_return_marked_delegations - return previously marked delegations
* @clp: nfs_client to process
*
* 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_server *server;
struct inode *inode;
int err = 0;
restart:
rcu_read_lock();
list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) {
if (!test_and_clear_bit(NFS_DELEGATION_RETURN, &delegation->flags))
continue;
inode = nfs_delegation_grab_inode(delegation);
if (inode == NULL)
continue;
delegation = nfs_detach_delegation(NFS_I(inode), clp);
rcu_read_unlock();
if (delegation != NULL) {
filemap_flush(inode->i_mapping);
err = __nfs_inode_return_delegation(inode, delegation, 0);
list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) {
list_for_each_entry_rcu(delegation, &server->delegations,
super_list) {
if (!test_and_clear_bit(NFS_DELEGATION_RETURN,
&delegation->flags))
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) {
filemap_flush(inode->i_mapping);
err = __nfs_inode_return_delegation(inode,
delegation, 0);
}
iput(inode);
if (!err)
goto restart;
set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state);
return err;
}
iput(inode);
if (!err)
goto restart;
set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state);
return err;
}
rcu_read_unlock();
return 0;
}
/*
* This function returns the delegation without reclaiming opens
* or protecting against delegation reclaims.
* It is therefore really only safe to be called from
* nfs4_clear_inode()
/**
* 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_client *clp = NFS_SERVER(inode)->nfs_client;
struct nfs_server *server = NFS_SERVER(inode);
struct nfs_inode *nfsi = NFS_I(inode);
struct nfs_delegation *delegation;
if (rcu_access_pointer(nfsi->delegation) != NULL) {
delegation = nfs_detach_delegation(nfsi, clp);
delegation = nfs_detach_delegation(nfsi, server);
if (delegation != NULL)
nfs_do_return_delegation(inode, delegation, 0);
}
}
/**
* nfs_inode_return_delegation - synchronously return a delegation
* @inode: inode to process
*
* Returns zero on success, or a negative errno value.
*/
int nfs_inode_return_delegation(struct inode *inode)
{
struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
struct nfs_server *server = NFS_SERVER(inode);
struct nfs_inode *nfsi = NFS_I(inode);
struct nfs_delegation *delegation;
int err = 0;
if (rcu_access_pointer(nfsi->delegation) != NULL) {
delegation = nfs_detach_delegation(nfsi, clp);
delegation = nfs_detach_delegation(nfsi, server);
if (delegation != NULL) {
nfs_wb_all(inode);
err = __nfs_inode_return_delegation(inode, delegation, 1);
@ -366,46 +408,61 @@ int nfs_inode_return_delegation(struct inode *inode)
return err;
}
static void nfs_mark_return_delegation(struct nfs_client *clp, struct nfs_delegation *delegation)
static void nfs_mark_return_delegation(struct nfs_delegation *delegation)
{
struct nfs_client *clp = NFS_SERVER(delegation->inode)->nfs_client;
set_bit(NFS_DELEGATION_RETURN, &delegation->flags);
set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state);
}
/*
* Return all delegations associated to a super block
/**
* nfs_super_return_all_delegations - return delegations for one superblock
* @sb: sb to process
*
*/
void nfs_super_return_all_delegations(struct super_block *sb)
{
struct nfs_client *clp = NFS_SB(sb)->nfs_client;
struct nfs_server *server = NFS_SB(sb);
struct nfs_client *clp = server->nfs_client;
struct nfs_delegation *delegation;
if (clp == NULL)
return;
rcu_read_lock();
list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) {
list_for_each_entry_rcu(delegation, &server->delegations, super_list) {
spin_lock(&delegation->lock);
if (delegation->inode != NULL && delegation->inode->i_sb == sb)
set_bit(NFS_DELEGATION_RETURN, &delegation->flags);
set_bit(NFS_DELEGATION_RETURN, &delegation->flags);
spin_unlock(&delegation->lock);
}
rcu_read_unlock();
if (nfs_client_return_marked_delegations(clp) != 0)
nfs4_schedule_state_manager(clp);
}
static
void nfs_client_mark_return_all_delegation_types(struct nfs_client *clp, fmode_t flags)
static void nfs_mark_return_all_delegation_types(struct nfs_server *server,
fmode_t flags)
{
struct nfs_delegation *delegation;
rcu_read_lock();
list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) {
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_delegation(clp, delegation);
nfs_mark_return_delegation(delegation);
}
}
static void nfs_client_mark_return_all_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_all_delegation_types(server, flags);
rcu_read_unlock();
}
@ -420,19 +477,32 @@ static void nfs_delegation_run_state_manager(struct nfs_client *clp)
nfs4_schedule_state_manager(clp);
}
/**
* nfs_expire_all_delegation_types
* @clp: client to process
* @flags: delegation types to expire
*
*/
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);
}
/*
* Return all delegations following an NFS4ERR_CB_PATH_DOWN error.
/**
* 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)
{
@ -441,29 +511,43 @@ void nfs_handle_cb_pathdown(struct nfs_client *clp)
nfs_client_mark_return_all_delegations(clp);
}
static void nfs_client_mark_return_unreferenced_delegations(struct nfs_client *clp)
static void nfs_mark_return_unreferenced_delegations(struct nfs_server *server)
{
struct nfs_delegation *delegation;
rcu_read_lock();
list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) {
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(clp, delegation);
nfs_mark_return_delegation(delegation);
}
rcu_read_unlock();
}
/**
* nfs_expire_unreferenced_delegations - Eliminate unused delegations
* @clp: nfs_client to process
*
*/
void nfs_expire_unreferenced_delegations(struct nfs_client *clp)
{
nfs_client_mark_return_unreferenced_delegations(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);
}
/*
* Asynchronous delegation recall!
/**
* 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)
int nfs_async_inode_return_delegation(struct inode *inode,
const nfs4_stateid *stateid)
{
struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
struct nfs_delegation *delegation;
@ -475,22 +559,21 @@ int nfs_async_inode_return_delegation(struct inode *inode, const nfs4_stateid *s
rcu_read_unlock();
return -ENOENT;
}
nfs_mark_return_delegation(clp, delegation);
nfs_mark_return_delegation(delegation);
rcu_read_unlock();
nfs_delegation_run_state_manager(clp);
return 0;
}
/*
* Retrieve the inode associated with a delegation
*/
struct inode *nfs_delegation_find_inode(struct nfs_client *clp, const struct nfs_fh *fhandle)
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;
rcu_read_lock();
list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) {
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) {
@ -500,47 +583,121 @@ struct inode *nfs_delegation_find_inode(struct nfs_client *clp, const struct nfs
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;
}
/*
* Mark all delegations as needing to be reclaimed
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_delegation *delegation;
struct nfs_server *server;
rcu_read_lock();
list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list)
set_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags);
list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link)
nfs_delegation_mark_reclaim_server(server);
rcu_read_unlock();
}
/*
* Reap all unclaimed delegations after reboot recovery is done
/**
* 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(delegation, &clp->cl_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), clp);
rcu_read_unlock();
if (delegation != NULL)
nfs_free_delegation(delegation);
iput(inode);
goto restart;
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);

1
fs/nfs/delegation.h
View File

@ -44,6 +44,7 @@ void nfs_expire_all_delegation_types(struct nfs_client *clp, fmode_t flags);
void nfs_expire_unreferenced_delegations(struct nfs_client *clp);
void nfs_handle_cb_pathdown(struct nfs_client *clp);
int nfs_client_return_marked_delegations(struct nfs_client *clp);
int nfs_delegations_present(struct nfs_client *clp);
void nfs_delegation_mark_reclaim(struct nfs_client *clp);
void nfs_delegation_reap_unclaimed(struct nfs_client *clp);

2
fs/nfs/nfs4renewd.c
View File

@ -80,7 +80,7 @@ nfs4_renew_state(struct work_struct *work)
cred = ops->get_state_renewal_cred_locked(clp);
spin_unlock(&clp->cl_lock);
if (cred == NULL) {
if (list_empty(&clp->cl_delegations)) {
if (!nfs_delegations_present(clp)) {
set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state);
goto out;
}

2
include/linux/nfs_fs_sb.h
View File

@ -47,7 +47,6 @@ struct nfs_client {
u64 cl_clientid; /* constant */
unsigned long cl_state;
struct list_head cl_delegations;
spinlock_t cl_lock;
unsigned long cl_lease_time;
@ -152,6 +151,7 @@ struct nfs_server {
struct rb_root openowner_id;
struct rb_root lockowner_id;
#endif
struct list_head delegations;
void (*destroy)(struct nfs_server *);
atomic_t active; /* Keep trace of any activity to this server */