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2703 lines
70 KiB
2703 lines
70 KiB
/* |
|
* fs/nfs/nfs4state.c |
|
* |
|
* Client-side XDR for NFSv4. |
|
* |
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* Copyright (c) 2002 The Regents of the University of Michigan. |
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* All rights reserved. |
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* |
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* Kendrick Smith <[email protected]> |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. Neither the name of the University nor the names of its |
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* contributors may be used to endorse or promote products derived |
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* from this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED |
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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* |
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* Implementation of the NFSv4 state model. For the time being, |
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* this is minimal, but will be made much more complex in a |
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* subsequent patch. |
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*/ |
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|
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#include <linux/kernel.h> |
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#include <linux/slab.h> |
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#include <linux/fs.h> |
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#include <linux/nfs_fs.h> |
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#include <linux/kthread.h> |
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#include <linux/module.h> |
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#include <linux/random.h> |
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#include <linux/ratelimit.h> |
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#include <linux/workqueue.h> |
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#include <linux/bitops.h> |
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#include <linux/jiffies.h> |
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|
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#include <linux/sunrpc/clnt.h> |
|
|
|
#include "nfs4_fs.h" |
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#include "callback.h" |
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#include "delegation.h" |
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#include "internal.h" |
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#include "nfs4idmap.h" |
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#include "nfs4session.h" |
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#include "pnfs.h" |
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#include "netns.h" |
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#include "nfs4trace.h" |
|
|
|
#define NFSDBG_FACILITY NFSDBG_STATE |
|
|
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#define OPENOWNER_POOL_SIZE 8 |
|
|
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const nfs4_stateid zero_stateid = { |
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{ .data = { 0 } }, |
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.type = NFS4_SPECIAL_STATEID_TYPE, |
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}; |
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const nfs4_stateid invalid_stateid = { |
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{ |
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/* Funky initialiser keeps older gcc versions happy */ |
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.data = { 0xff, 0xff, 0xff, 0xff, 0 }, |
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}, |
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.type = NFS4_INVALID_STATEID_TYPE, |
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}; |
|
|
|
const nfs4_stateid current_stateid = { |
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{ |
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/* Funky initialiser keeps older gcc versions happy */ |
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.data = { 0x0, 0x0, 0x0, 0x1, 0 }, |
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}, |
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.type = NFS4_SPECIAL_STATEID_TYPE, |
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}; |
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|
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static DEFINE_MUTEX(nfs_clid_init_mutex); |
|
|
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static int nfs4_setup_state_renewal(struct nfs_client *clp) |
|
{ |
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int status; |
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struct nfs_fsinfo fsinfo; |
|
|
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if (!test_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state)) { |
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nfs4_schedule_state_renewal(clp); |
|
return 0; |
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} |
|
|
|
status = nfs4_proc_get_lease_time(clp, &fsinfo); |
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if (status == 0) { |
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nfs4_set_lease_period(clp, fsinfo.lease_time * HZ); |
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nfs4_schedule_state_renewal(clp); |
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} |
|
|
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return status; |
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} |
|
|
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int nfs4_init_clientid(struct nfs_client *clp, const struct cred *cred) |
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{ |
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struct nfs4_setclientid_res clid = { |
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.clientid = clp->cl_clientid, |
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.confirm = clp->cl_confirm, |
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}; |
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unsigned short port; |
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int status; |
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struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); |
|
|
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if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state)) |
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goto do_confirm; |
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port = nn->nfs_callback_tcpport; |
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if (clp->cl_addr.ss_family == AF_INET6) |
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port = nn->nfs_callback_tcpport6; |
|
|
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status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid); |
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if (status != 0) |
|
goto out; |
|
clp->cl_clientid = clid.clientid; |
|
clp->cl_confirm = clid.confirm; |
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set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); |
|
do_confirm: |
|
status = nfs4_proc_setclientid_confirm(clp, &clid, cred); |
|
if (status != 0) |
|
goto out; |
|
clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); |
|
nfs4_setup_state_renewal(clp); |
|
out: |
|
return status; |
|
} |
|
|
|
/** |
|
* nfs40_discover_server_trunking - Detect server IP address trunking (mv0) |
|
* |
|
* @clp: nfs_client under test |
|
* @result: OUT: found nfs_client, or clp |
|
* @cred: credential to use for trunking test |
|
* |
|
* Returns zero, a negative errno, or a negative NFS4ERR status. |
|
* If zero is returned, an nfs_client pointer is planted in |
|
* "result". |
|
* |
|
* Note: The returned client may not yet be marked ready. |
|
*/ |
|
int nfs40_discover_server_trunking(struct nfs_client *clp, |
|
struct nfs_client **result, |
|
const struct cred *cred) |
|
{ |
|
struct nfs4_setclientid_res clid = { |
|
.clientid = clp->cl_clientid, |
|
.confirm = clp->cl_confirm, |
|
}; |
|
struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id); |
|
unsigned short port; |
|
int status; |
|
|
|
port = nn->nfs_callback_tcpport; |
|
if (clp->cl_addr.ss_family == AF_INET6) |
|
port = nn->nfs_callback_tcpport6; |
|
|
|
status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred, &clid); |
|
if (status != 0) |
|
goto out; |
|
clp->cl_clientid = clid.clientid; |
|
clp->cl_confirm = clid.confirm; |
|
|
|
status = nfs40_walk_client_list(clp, result, cred); |
|
if (status == 0) { |
|
/* Sustain the lease, even if it's empty. If the clientid4 |
|
* goes stale it's of no use for trunking discovery. */ |
|
nfs4_schedule_state_renewal(*result); |
|
|
|
/* If the client state need to recover, do it. */ |
|
if (clp->cl_state) |
|
nfs4_schedule_state_manager(clp); |
|
} |
|
out: |
|
return status; |
|
} |
|
|
|
const struct cred *nfs4_get_machine_cred(struct nfs_client *clp) |
|
{ |
|
return get_cred(rpc_machine_cred()); |
|
} |
|
|
|
static void nfs4_root_machine_cred(struct nfs_client *clp) |
|
{ |
|
|
|
/* Force root creds instead of machine */ |
|
clp->cl_principal = NULL; |
|
clp->cl_rpcclient->cl_principal = NULL; |
|
} |
|
|
|
static const struct cred * |
|
nfs4_get_renew_cred_server_locked(struct nfs_server *server) |
|
{ |
|
const struct cred *cred = NULL; |
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struct nfs4_state_owner *sp; |
|
struct rb_node *pos; |
|
|
|
for (pos = rb_first(&server->state_owners); |
|
pos != NULL; |
|
pos = rb_next(pos)) { |
|
sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); |
|
if (list_empty(&sp->so_states)) |
|
continue; |
|
cred = get_cred(sp->so_cred); |
|
break; |
|
} |
|
return cred; |
|
} |
|
|
|
/** |
|
* nfs4_get_renew_cred - Acquire credential for a renew operation |
|
* @clp: client state handle |
|
* |
|
* Returns an rpc_cred with reference count bumped, or NULL. |
|
* Caller must hold clp->cl_lock. |
|
*/ |
|
const struct cred *nfs4_get_renew_cred(struct nfs_client *clp) |
|
{ |
|
const struct cred *cred = NULL; |
|
struct nfs_server *server; |
|
|
|
/* Use machine credentials if available */ |
|
cred = nfs4_get_machine_cred(clp); |
|
if (cred != NULL) |
|
goto out; |
|
|
|
spin_lock(&clp->cl_lock); |
|
rcu_read_lock(); |
|
list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
|
cred = nfs4_get_renew_cred_server_locked(server); |
|
if (cred != NULL) |
|
break; |
|
} |
|
rcu_read_unlock(); |
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spin_unlock(&clp->cl_lock); |
|
|
|
out: |
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return cred; |
|
} |
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|
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static void nfs4_end_drain_slot_table(struct nfs4_slot_table *tbl) |
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{ |
|
if (test_and_clear_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) { |
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spin_lock(&tbl->slot_tbl_lock); |
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nfs41_wake_slot_table(tbl); |
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spin_unlock(&tbl->slot_tbl_lock); |
|
} |
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} |
|
|
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static void nfs4_end_drain_session(struct nfs_client *clp) |
|
{ |
|
struct nfs4_session *ses = clp->cl_session; |
|
|
|
if (clp->cl_slot_tbl) { |
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nfs4_end_drain_slot_table(clp->cl_slot_tbl); |
|
return; |
|
} |
|
|
|
if (ses != NULL) { |
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nfs4_end_drain_slot_table(&ses->bc_slot_table); |
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nfs4_end_drain_slot_table(&ses->fc_slot_table); |
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} |
|
} |
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|
|
static int nfs4_drain_slot_tbl(struct nfs4_slot_table *tbl) |
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{ |
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set_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state); |
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spin_lock(&tbl->slot_tbl_lock); |
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if (tbl->highest_used_slotid != NFS4_NO_SLOT) { |
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reinit_completion(&tbl->complete); |
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spin_unlock(&tbl->slot_tbl_lock); |
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return wait_for_completion_interruptible(&tbl->complete); |
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} |
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spin_unlock(&tbl->slot_tbl_lock); |
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return 0; |
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} |
|
|
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static int nfs4_begin_drain_session(struct nfs_client *clp) |
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{ |
|
struct nfs4_session *ses = clp->cl_session; |
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int ret; |
|
|
|
if (clp->cl_slot_tbl) |
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return nfs4_drain_slot_tbl(clp->cl_slot_tbl); |
|
|
|
/* back channel */ |
|
ret = nfs4_drain_slot_tbl(&ses->bc_slot_table); |
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if (ret) |
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return ret; |
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/* fore channel */ |
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return nfs4_drain_slot_tbl(&ses->fc_slot_table); |
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} |
|
|
|
#if defined(CONFIG_NFS_V4_1) |
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|
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static void nfs41_finish_session_reset(struct nfs_client *clp) |
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{ |
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clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); |
|
clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); |
|
/* create_session negotiated new slot table */ |
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clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state); |
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nfs4_setup_state_renewal(clp); |
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} |
|
|
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int nfs41_init_clientid(struct nfs_client *clp, const struct cred *cred) |
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{ |
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int status; |
|
|
|
if (test_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state)) |
|
goto do_confirm; |
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status = nfs4_proc_exchange_id(clp, cred); |
|
if (status != 0) |
|
goto out; |
|
set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); |
|
do_confirm: |
|
status = nfs4_proc_create_session(clp, cred); |
|
if (status != 0) |
|
goto out; |
|
nfs41_finish_session_reset(clp); |
|
nfs_mark_client_ready(clp, NFS_CS_READY); |
|
out: |
|
return status; |
|
} |
|
|
|
/** |
|
* nfs41_discover_server_trunking - Detect server IP address trunking (mv1) |
|
* |
|
* @clp: nfs_client under test |
|
* @result: OUT: found nfs_client, or clp |
|
* @cred: credential to use for trunking test |
|
* |
|
* Returns NFS4_OK, a negative errno, or a negative NFS4ERR status. |
|
* If NFS4_OK is returned, an nfs_client pointer is planted in |
|
* "result". |
|
* |
|
* Note: The returned client may not yet be marked ready. |
|
*/ |
|
int nfs41_discover_server_trunking(struct nfs_client *clp, |
|
struct nfs_client **result, |
|
const struct cred *cred) |
|
{ |
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int status; |
|
|
|
status = nfs4_proc_exchange_id(clp, cred); |
|
if (status != NFS4_OK) |
|
return status; |
|
|
|
status = nfs41_walk_client_list(clp, result, cred); |
|
if (status < 0) |
|
return status; |
|
if (clp != *result) |
|
return 0; |
|
|
|
/* |
|
* Purge state if the client id was established in a prior |
|
* instance and the client id could not have arrived on the |
|
* server via Transparent State Migration. |
|
*/ |
|
if (clp->cl_exchange_flags & EXCHGID4_FLAG_CONFIRMED_R) { |
|
if (!test_bit(NFS_CS_TSM_POSSIBLE, &clp->cl_flags)) |
|
set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state); |
|
else |
|
set_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); |
|
} |
|
nfs4_schedule_state_manager(clp); |
|
status = nfs_wait_client_init_complete(clp); |
|
if (status < 0) |
|
nfs_put_client(clp); |
|
return status; |
|
} |
|
|
|
#endif /* CONFIG_NFS_V4_1 */ |
|
|
|
/** |
|
* nfs4_get_clid_cred - Acquire credential for a setclientid operation |
|
* @clp: client state handle |
|
* |
|
* Returns a cred with reference count bumped, or NULL. |
|
*/ |
|
const struct cred *nfs4_get_clid_cred(struct nfs_client *clp) |
|
{ |
|
const struct cred *cred; |
|
|
|
cred = nfs4_get_machine_cred(clp); |
|
return cred; |
|
} |
|
|
|
static struct nfs4_state_owner * |
|
nfs4_find_state_owner_locked(struct nfs_server *server, const struct cred *cred) |
|
{ |
|
struct rb_node **p = &server->state_owners.rb_node, |
|
*parent = NULL; |
|
struct nfs4_state_owner *sp; |
|
int cmp; |
|
|
|
while (*p != NULL) { |
|
parent = *p; |
|
sp = rb_entry(parent, struct nfs4_state_owner, so_server_node); |
|
cmp = cred_fscmp(cred, sp->so_cred); |
|
|
|
if (cmp < 0) |
|
p = &parent->rb_left; |
|
else if (cmp > 0) |
|
p = &parent->rb_right; |
|
else { |
|
if (!list_empty(&sp->so_lru)) |
|
list_del_init(&sp->so_lru); |
|
atomic_inc(&sp->so_count); |
|
return sp; |
|
} |
|
} |
|
return NULL; |
|
} |
|
|
|
static struct nfs4_state_owner * |
|
nfs4_insert_state_owner_locked(struct nfs4_state_owner *new) |
|
{ |
|
struct nfs_server *server = new->so_server; |
|
struct rb_node **p = &server->state_owners.rb_node, |
|
*parent = NULL; |
|
struct nfs4_state_owner *sp; |
|
int cmp; |
|
|
|
while (*p != NULL) { |
|
parent = *p; |
|
sp = rb_entry(parent, struct nfs4_state_owner, so_server_node); |
|
cmp = cred_fscmp(new->so_cred, sp->so_cred); |
|
|
|
if (cmp < 0) |
|
p = &parent->rb_left; |
|
else if (cmp > 0) |
|
p = &parent->rb_right; |
|
else { |
|
if (!list_empty(&sp->so_lru)) |
|
list_del_init(&sp->so_lru); |
|
atomic_inc(&sp->so_count); |
|
return sp; |
|
} |
|
} |
|
rb_link_node(&new->so_server_node, parent, p); |
|
rb_insert_color(&new->so_server_node, &server->state_owners); |
|
return new; |
|
} |
|
|
|
static void |
|
nfs4_remove_state_owner_locked(struct nfs4_state_owner *sp) |
|
{ |
|
struct nfs_server *server = sp->so_server; |
|
|
|
if (!RB_EMPTY_NODE(&sp->so_server_node)) |
|
rb_erase(&sp->so_server_node, &server->state_owners); |
|
} |
|
|
|
static void |
|
nfs4_init_seqid_counter(struct nfs_seqid_counter *sc) |
|
{ |
|
sc->create_time = ktime_get(); |
|
sc->flags = 0; |
|
sc->counter = 0; |
|
spin_lock_init(&sc->lock); |
|
INIT_LIST_HEAD(&sc->list); |
|
rpc_init_wait_queue(&sc->wait, "Seqid_waitqueue"); |
|
} |
|
|
|
static void |
|
nfs4_destroy_seqid_counter(struct nfs_seqid_counter *sc) |
|
{ |
|
rpc_destroy_wait_queue(&sc->wait); |
|
} |
|
|
|
/* |
|
* nfs4_alloc_state_owner(): this is called on the OPEN or CREATE path to |
|
* create a new state_owner. |
|
* |
|
*/ |
|
static struct nfs4_state_owner * |
|
nfs4_alloc_state_owner(struct nfs_server *server, |
|
const struct cred *cred, |
|
gfp_t gfp_flags) |
|
{ |
|
struct nfs4_state_owner *sp; |
|
|
|
sp = kzalloc(sizeof(*sp), gfp_flags); |
|
if (!sp) |
|
return NULL; |
|
sp->so_seqid.owner_id = ida_simple_get(&server->openowner_id, 0, 0, |
|
gfp_flags); |
|
if (sp->so_seqid.owner_id < 0) { |
|
kfree(sp); |
|
return NULL; |
|
} |
|
sp->so_server = server; |
|
sp->so_cred = get_cred(cred); |
|
spin_lock_init(&sp->so_lock); |
|
INIT_LIST_HEAD(&sp->so_states); |
|
nfs4_init_seqid_counter(&sp->so_seqid); |
|
atomic_set(&sp->so_count, 1); |
|
INIT_LIST_HEAD(&sp->so_lru); |
|
seqcount_spinlock_init(&sp->so_reclaim_seqcount, &sp->so_lock); |
|
mutex_init(&sp->so_delegreturn_mutex); |
|
return sp; |
|
} |
|
|
|
static void |
|
nfs4_reset_state_owner(struct nfs4_state_owner *sp) |
|
{ |
|
/* This state_owner is no longer usable, but must |
|
* remain in place so that state recovery can find it |
|
* and the opens associated with it. |
|
* It may also be used for new 'open' request to |
|
* return a delegation to the server. |
|
* So update the 'create_time' so that it looks like |
|
* a new state_owner. This will cause the server to |
|
* request an OPEN_CONFIRM to start a new sequence. |
|
*/ |
|
sp->so_seqid.create_time = ktime_get(); |
|
} |
|
|
|
static void nfs4_free_state_owner(struct nfs4_state_owner *sp) |
|
{ |
|
nfs4_destroy_seqid_counter(&sp->so_seqid); |
|
put_cred(sp->so_cred); |
|
ida_simple_remove(&sp->so_server->openowner_id, sp->so_seqid.owner_id); |
|
kfree(sp); |
|
} |
|
|
|
static void nfs4_gc_state_owners(struct nfs_server *server) |
|
{ |
|
struct nfs_client *clp = server->nfs_client; |
|
struct nfs4_state_owner *sp, *tmp; |
|
unsigned long time_min, time_max; |
|
LIST_HEAD(doomed); |
|
|
|
spin_lock(&clp->cl_lock); |
|
time_max = jiffies; |
|
time_min = (long)time_max - (long)clp->cl_lease_time; |
|
list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) { |
|
/* NB: LRU is sorted so that oldest is at the head */ |
|
if (time_in_range(sp->so_expires, time_min, time_max)) |
|
break; |
|
list_move(&sp->so_lru, &doomed); |
|
nfs4_remove_state_owner_locked(sp); |
|
} |
|
spin_unlock(&clp->cl_lock); |
|
|
|
list_for_each_entry_safe(sp, tmp, &doomed, so_lru) { |
|
list_del(&sp->so_lru); |
|
nfs4_free_state_owner(sp); |
|
} |
|
} |
|
|
|
/** |
|
* nfs4_get_state_owner - Look up a state owner given a credential |
|
* @server: nfs_server to search |
|
* @cred: RPC credential to match |
|
* @gfp_flags: allocation mode |
|
* |
|
* Returns a pointer to an instantiated nfs4_state_owner struct, or NULL. |
|
*/ |
|
struct nfs4_state_owner *nfs4_get_state_owner(struct nfs_server *server, |
|
const struct cred *cred, |
|
gfp_t gfp_flags) |
|
{ |
|
struct nfs_client *clp = server->nfs_client; |
|
struct nfs4_state_owner *sp, *new; |
|
|
|
spin_lock(&clp->cl_lock); |
|
sp = nfs4_find_state_owner_locked(server, cred); |
|
spin_unlock(&clp->cl_lock); |
|
if (sp != NULL) |
|
goto out; |
|
new = nfs4_alloc_state_owner(server, cred, gfp_flags); |
|
if (new == NULL) |
|
goto out; |
|
spin_lock(&clp->cl_lock); |
|
sp = nfs4_insert_state_owner_locked(new); |
|
spin_unlock(&clp->cl_lock); |
|
if (sp != new) |
|
nfs4_free_state_owner(new); |
|
out: |
|
nfs4_gc_state_owners(server); |
|
return sp; |
|
} |
|
|
|
/** |
|
* nfs4_put_state_owner - Release a nfs4_state_owner |
|
* @sp: state owner data to release |
|
* |
|
* Note that we keep released state owners on an LRU |
|
* list. |
|
* This caches valid state owners so that they can be |
|
* reused, to avoid the OPEN_CONFIRM on minor version 0. |
|
* It also pins the uniquifier of dropped state owners for |
|
* a while, to ensure that those state owner names are |
|
* never reused. |
|
*/ |
|
void nfs4_put_state_owner(struct nfs4_state_owner *sp) |
|
{ |
|
struct nfs_server *server = sp->so_server; |
|
struct nfs_client *clp = server->nfs_client; |
|
|
|
if (!atomic_dec_and_lock(&sp->so_count, &clp->cl_lock)) |
|
return; |
|
|
|
sp->so_expires = jiffies; |
|
list_add_tail(&sp->so_lru, &server->state_owners_lru); |
|
spin_unlock(&clp->cl_lock); |
|
} |
|
|
|
/** |
|
* nfs4_purge_state_owners - Release all cached state owners |
|
* @server: nfs_server with cached state owners to release |
|
* @head: resulting list of state owners |
|
* |
|
* Called at umount time. Remaining state owners will be on |
|
* the LRU with ref count of zero. |
|
* Note that the state owners are not freed, but are added |
|
* to the list @head, which can later be used as an argument |
|
* to nfs4_free_state_owners. |
|
*/ |
|
void nfs4_purge_state_owners(struct nfs_server *server, struct list_head *head) |
|
{ |
|
struct nfs_client *clp = server->nfs_client; |
|
struct nfs4_state_owner *sp, *tmp; |
|
|
|
spin_lock(&clp->cl_lock); |
|
list_for_each_entry_safe(sp, tmp, &server->state_owners_lru, so_lru) { |
|
list_move(&sp->so_lru, head); |
|
nfs4_remove_state_owner_locked(sp); |
|
} |
|
spin_unlock(&clp->cl_lock); |
|
} |
|
|
|
/** |
|
* nfs4_purge_state_owners - Release all cached state owners |
|
* @head: resulting list of state owners |
|
* |
|
* Frees a list of state owners that was generated by |
|
* nfs4_purge_state_owners |
|
*/ |
|
void nfs4_free_state_owners(struct list_head *head) |
|
{ |
|
struct nfs4_state_owner *sp, *tmp; |
|
|
|
list_for_each_entry_safe(sp, tmp, head, so_lru) { |
|
list_del(&sp->so_lru); |
|
nfs4_free_state_owner(sp); |
|
} |
|
} |
|
|
|
static struct nfs4_state * |
|
nfs4_alloc_open_state(void) |
|
{ |
|
struct nfs4_state *state; |
|
|
|
state = kzalloc(sizeof(*state), GFP_NOFS); |
|
if (!state) |
|
return NULL; |
|
refcount_set(&state->count, 1); |
|
INIT_LIST_HEAD(&state->lock_states); |
|
spin_lock_init(&state->state_lock); |
|
seqlock_init(&state->seqlock); |
|
init_waitqueue_head(&state->waitq); |
|
return state; |
|
} |
|
|
|
void |
|
nfs4_state_set_mode_locked(struct nfs4_state *state, fmode_t fmode) |
|
{ |
|
if (state->state == fmode) |
|
return; |
|
/* NB! List reordering - see the reclaim code for why. */ |
|
if ((fmode & FMODE_WRITE) != (state->state & FMODE_WRITE)) { |
|
if (fmode & FMODE_WRITE) |
|
list_move(&state->open_states, &state->owner->so_states); |
|
else |
|
list_move_tail(&state->open_states, &state->owner->so_states); |
|
} |
|
state->state = fmode; |
|
} |
|
|
|
static struct nfs4_state * |
|
__nfs4_find_state_byowner(struct inode *inode, struct nfs4_state_owner *owner) |
|
{ |
|
struct nfs_inode *nfsi = NFS_I(inode); |
|
struct nfs4_state *state; |
|
|
|
list_for_each_entry_rcu(state, &nfsi->open_states, inode_states) { |
|
if (state->owner != owner) |
|
continue; |
|
if (!nfs4_valid_open_stateid(state)) |
|
continue; |
|
if (refcount_inc_not_zero(&state->count)) |
|
return state; |
|
} |
|
return NULL; |
|
} |
|
|
|
static void |
|
nfs4_free_open_state(struct nfs4_state *state) |
|
{ |
|
kfree_rcu(state, rcu_head); |
|
} |
|
|
|
struct nfs4_state * |
|
nfs4_get_open_state(struct inode *inode, struct nfs4_state_owner *owner) |
|
{ |
|
struct nfs4_state *state, *new; |
|
struct nfs_inode *nfsi = NFS_I(inode); |
|
|
|
rcu_read_lock(); |
|
state = __nfs4_find_state_byowner(inode, owner); |
|
rcu_read_unlock(); |
|
if (state) |
|
goto out; |
|
new = nfs4_alloc_open_state(); |
|
spin_lock(&owner->so_lock); |
|
spin_lock(&inode->i_lock); |
|
state = __nfs4_find_state_byowner(inode, owner); |
|
if (state == NULL && new != NULL) { |
|
state = new; |
|
state->owner = owner; |
|
atomic_inc(&owner->so_count); |
|
ihold(inode); |
|
state->inode = inode; |
|
list_add_rcu(&state->inode_states, &nfsi->open_states); |
|
spin_unlock(&inode->i_lock); |
|
/* Note: The reclaim code dictates that we add stateless |
|
* and read-only stateids to the end of the list */ |
|
list_add_tail(&state->open_states, &owner->so_states); |
|
spin_unlock(&owner->so_lock); |
|
} else { |
|
spin_unlock(&inode->i_lock); |
|
spin_unlock(&owner->so_lock); |
|
if (new) |
|
nfs4_free_open_state(new); |
|
} |
|
out: |
|
return state; |
|
} |
|
|
|
void nfs4_put_open_state(struct nfs4_state *state) |
|
{ |
|
struct inode *inode = state->inode; |
|
struct nfs4_state_owner *owner = state->owner; |
|
|
|
if (!refcount_dec_and_lock(&state->count, &owner->so_lock)) |
|
return; |
|
spin_lock(&inode->i_lock); |
|
list_del_rcu(&state->inode_states); |
|
list_del(&state->open_states); |
|
spin_unlock(&inode->i_lock); |
|
spin_unlock(&owner->so_lock); |
|
nfs4_inode_return_delegation_on_close(inode); |
|
iput(inode); |
|
nfs4_free_open_state(state); |
|
nfs4_put_state_owner(owner); |
|
} |
|
|
|
/* |
|
* Close the current file. |
|
*/ |
|
static void __nfs4_close(struct nfs4_state *state, |
|
fmode_t fmode, gfp_t gfp_mask, int wait) |
|
{ |
|
struct nfs4_state_owner *owner = state->owner; |
|
int call_close = 0; |
|
fmode_t newstate; |
|
|
|
atomic_inc(&owner->so_count); |
|
/* Protect against nfs4_find_state() */ |
|
spin_lock(&owner->so_lock); |
|
switch (fmode & (FMODE_READ | FMODE_WRITE)) { |
|
case FMODE_READ: |
|
state->n_rdonly--; |
|
break; |
|
case FMODE_WRITE: |
|
state->n_wronly--; |
|
break; |
|
case FMODE_READ|FMODE_WRITE: |
|
state->n_rdwr--; |
|
} |
|
newstate = FMODE_READ|FMODE_WRITE; |
|
if (state->n_rdwr == 0) { |
|
if (state->n_rdonly == 0) { |
|
newstate &= ~FMODE_READ; |
|
call_close |= test_bit(NFS_O_RDONLY_STATE, &state->flags); |
|
call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); |
|
} |
|
if (state->n_wronly == 0) { |
|
newstate &= ~FMODE_WRITE; |
|
call_close |= test_bit(NFS_O_WRONLY_STATE, &state->flags); |
|
call_close |= test_bit(NFS_O_RDWR_STATE, &state->flags); |
|
} |
|
if (newstate == 0) |
|
clear_bit(NFS_DELEGATED_STATE, &state->flags); |
|
} |
|
nfs4_state_set_mode_locked(state, newstate); |
|
spin_unlock(&owner->so_lock); |
|
|
|
if (!call_close) { |
|
nfs4_put_open_state(state); |
|
nfs4_put_state_owner(owner); |
|
} else |
|
nfs4_do_close(state, gfp_mask, wait); |
|
} |
|
|
|
void nfs4_close_state(struct nfs4_state *state, fmode_t fmode) |
|
{ |
|
__nfs4_close(state, fmode, GFP_NOFS, 0); |
|
} |
|
|
|
void nfs4_close_sync(struct nfs4_state *state, fmode_t fmode) |
|
{ |
|
__nfs4_close(state, fmode, GFP_KERNEL, 1); |
|
} |
|
|
|
/* |
|
* Search the state->lock_states for an existing lock_owner |
|
* that is compatible with either of the given owners. |
|
* If the second is non-zero, then the first refers to a Posix-lock |
|
* owner (current->files) and the second refers to a flock/OFD |
|
* owner (struct file*). In that case, prefer a match for the first |
|
* owner. |
|
* If both sorts of locks are held on the one file we cannot know |
|
* which stateid was intended to be used, so a "correct" choice cannot |
|
* be made. Failing that, a "consistent" choice is preferable. The |
|
* consistent choice we make is to prefer the first owner, that of a |
|
* Posix lock. |
|
*/ |
|
static struct nfs4_lock_state * |
|
__nfs4_find_lock_state(struct nfs4_state *state, |
|
fl_owner_t fl_owner, fl_owner_t fl_owner2) |
|
{ |
|
struct nfs4_lock_state *pos, *ret = NULL; |
|
list_for_each_entry(pos, &state->lock_states, ls_locks) { |
|
if (pos->ls_owner == fl_owner) { |
|
ret = pos; |
|
break; |
|
} |
|
if (pos->ls_owner == fl_owner2) |
|
ret = pos; |
|
} |
|
if (ret) |
|
refcount_inc(&ret->ls_count); |
|
return ret; |
|
} |
|
|
|
/* |
|
* Return a compatible lock_state. If no initialized lock_state structure |
|
* exists, return an uninitialized one. |
|
* |
|
*/ |
|
static struct nfs4_lock_state *nfs4_alloc_lock_state(struct nfs4_state *state, fl_owner_t fl_owner) |
|
{ |
|
struct nfs4_lock_state *lsp; |
|
struct nfs_server *server = state->owner->so_server; |
|
|
|
lsp = kzalloc(sizeof(*lsp), GFP_NOFS); |
|
if (lsp == NULL) |
|
return NULL; |
|
nfs4_init_seqid_counter(&lsp->ls_seqid); |
|
refcount_set(&lsp->ls_count, 1); |
|
lsp->ls_state = state; |
|
lsp->ls_owner = fl_owner; |
|
lsp->ls_seqid.owner_id = ida_simple_get(&server->lockowner_id, 0, 0, GFP_NOFS); |
|
if (lsp->ls_seqid.owner_id < 0) |
|
goto out_free; |
|
INIT_LIST_HEAD(&lsp->ls_locks); |
|
return lsp; |
|
out_free: |
|
kfree(lsp); |
|
return NULL; |
|
} |
|
|
|
void nfs4_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp) |
|
{ |
|
ida_simple_remove(&server->lockowner_id, lsp->ls_seqid.owner_id); |
|
nfs4_destroy_seqid_counter(&lsp->ls_seqid); |
|
kfree(lsp); |
|
} |
|
|
|
/* |
|
* Return a compatible lock_state. If no initialized lock_state structure |
|
* exists, return an uninitialized one. |
|
* |
|
*/ |
|
static struct nfs4_lock_state *nfs4_get_lock_state(struct nfs4_state *state, fl_owner_t owner) |
|
{ |
|
struct nfs4_lock_state *lsp, *new = NULL; |
|
|
|
for(;;) { |
|
spin_lock(&state->state_lock); |
|
lsp = __nfs4_find_lock_state(state, owner, NULL); |
|
if (lsp != NULL) |
|
break; |
|
if (new != NULL) { |
|
list_add(&new->ls_locks, &state->lock_states); |
|
set_bit(LK_STATE_IN_USE, &state->flags); |
|
lsp = new; |
|
new = NULL; |
|
break; |
|
} |
|
spin_unlock(&state->state_lock); |
|
new = nfs4_alloc_lock_state(state, owner); |
|
if (new == NULL) |
|
return NULL; |
|
} |
|
spin_unlock(&state->state_lock); |
|
if (new != NULL) |
|
nfs4_free_lock_state(state->owner->so_server, new); |
|
return lsp; |
|
} |
|
|
|
/* |
|
* Release reference to lock_state, and free it if we see that |
|
* it is no longer in use |
|
*/ |
|
void nfs4_put_lock_state(struct nfs4_lock_state *lsp) |
|
{ |
|
struct nfs_server *server; |
|
struct nfs4_state *state; |
|
|
|
if (lsp == NULL) |
|
return; |
|
state = lsp->ls_state; |
|
if (!refcount_dec_and_lock(&lsp->ls_count, &state->state_lock)) |
|
return; |
|
list_del(&lsp->ls_locks); |
|
if (list_empty(&state->lock_states)) |
|
clear_bit(LK_STATE_IN_USE, &state->flags); |
|
spin_unlock(&state->state_lock); |
|
server = state->owner->so_server; |
|
if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) { |
|
struct nfs_client *clp = server->nfs_client; |
|
|
|
clp->cl_mvops->free_lock_state(server, lsp); |
|
} else |
|
nfs4_free_lock_state(server, lsp); |
|
} |
|
|
|
static void nfs4_fl_copy_lock(struct file_lock *dst, struct file_lock *src) |
|
{ |
|
struct nfs4_lock_state *lsp = src->fl_u.nfs4_fl.owner; |
|
|
|
dst->fl_u.nfs4_fl.owner = lsp; |
|
refcount_inc(&lsp->ls_count); |
|
} |
|
|
|
static void nfs4_fl_release_lock(struct file_lock *fl) |
|
{ |
|
nfs4_put_lock_state(fl->fl_u.nfs4_fl.owner); |
|
} |
|
|
|
static const struct file_lock_operations nfs4_fl_lock_ops = { |
|
.fl_copy_lock = nfs4_fl_copy_lock, |
|
.fl_release_private = nfs4_fl_release_lock, |
|
}; |
|
|
|
int nfs4_set_lock_state(struct nfs4_state *state, struct file_lock *fl) |
|
{ |
|
struct nfs4_lock_state *lsp; |
|
|
|
if (fl->fl_ops != NULL) |
|
return 0; |
|
lsp = nfs4_get_lock_state(state, fl->fl_owner); |
|
if (lsp == NULL) |
|
return -ENOMEM; |
|
fl->fl_u.nfs4_fl.owner = lsp; |
|
fl->fl_ops = &nfs4_fl_lock_ops; |
|
return 0; |
|
} |
|
|
|
static int nfs4_copy_lock_stateid(nfs4_stateid *dst, |
|
struct nfs4_state *state, |
|
const struct nfs_lock_context *l_ctx) |
|
{ |
|
struct nfs4_lock_state *lsp; |
|
fl_owner_t fl_owner, fl_flock_owner; |
|
int ret = -ENOENT; |
|
|
|
if (l_ctx == NULL) |
|
goto out; |
|
|
|
if (test_bit(LK_STATE_IN_USE, &state->flags) == 0) |
|
goto out; |
|
|
|
fl_owner = l_ctx->lockowner; |
|
fl_flock_owner = l_ctx->open_context->flock_owner; |
|
|
|
spin_lock(&state->state_lock); |
|
lsp = __nfs4_find_lock_state(state, fl_owner, fl_flock_owner); |
|
if (lsp && test_bit(NFS_LOCK_LOST, &lsp->ls_flags)) |
|
ret = -EIO; |
|
else if (lsp != NULL && test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0) { |
|
nfs4_stateid_copy(dst, &lsp->ls_stateid); |
|
ret = 0; |
|
} |
|
spin_unlock(&state->state_lock); |
|
nfs4_put_lock_state(lsp); |
|
out: |
|
return ret; |
|
} |
|
|
|
bool nfs4_copy_open_stateid(nfs4_stateid *dst, struct nfs4_state *state) |
|
{ |
|
bool ret; |
|
const nfs4_stateid *src; |
|
int seq; |
|
|
|
do { |
|
ret = false; |
|
src = &zero_stateid; |
|
seq = read_seqbegin(&state->seqlock); |
|
if (test_bit(NFS_OPEN_STATE, &state->flags)) { |
|
src = &state->open_stateid; |
|
ret = true; |
|
} |
|
nfs4_stateid_copy(dst, src); |
|
} while (read_seqretry(&state->seqlock, seq)); |
|
return ret; |
|
} |
|
|
|
/* |
|
* Byte-range lock aware utility to initialize the stateid of read/write |
|
* requests. |
|
*/ |
|
int nfs4_select_rw_stateid(struct nfs4_state *state, |
|
fmode_t fmode, const struct nfs_lock_context *l_ctx, |
|
nfs4_stateid *dst, const struct cred **cred) |
|
{ |
|
int ret; |
|
|
|
if (!nfs4_valid_open_stateid(state)) |
|
return -EIO; |
|
if (cred != NULL) |
|
*cred = NULL; |
|
ret = nfs4_copy_lock_stateid(dst, state, l_ctx); |
|
if (ret == -EIO) |
|
/* A lost lock - don't even consider delegations */ |
|
goto out; |
|
/* returns true if delegation stateid found and copied */ |
|
if (nfs4_copy_delegation_stateid(state->inode, fmode, dst, cred)) { |
|
ret = 0; |
|
goto out; |
|
} |
|
if (ret != -ENOENT) |
|
/* nfs4_copy_delegation_stateid() didn't over-write |
|
* dst, so it still has the lock stateid which we now |
|
* choose to use. |
|
*/ |
|
goto out; |
|
ret = nfs4_copy_open_stateid(dst, state) ? 0 : -EAGAIN; |
|
out: |
|
if (nfs_server_capable(state->inode, NFS_CAP_STATEID_NFSV41)) |
|
dst->seqid = 0; |
|
return ret; |
|
} |
|
|
|
struct nfs_seqid *nfs_alloc_seqid(struct nfs_seqid_counter *counter, gfp_t gfp_mask) |
|
{ |
|
struct nfs_seqid *new; |
|
|
|
new = kmalloc(sizeof(*new), gfp_mask); |
|
if (new == NULL) |
|
return ERR_PTR(-ENOMEM); |
|
new->sequence = counter; |
|
INIT_LIST_HEAD(&new->list); |
|
new->task = NULL; |
|
return new; |
|
} |
|
|
|
void nfs_release_seqid(struct nfs_seqid *seqid) |
|
{ |
|
struct nfs_seqid_counter *sequence; |
|
|
|
if (seqid == NULL || list_empty(&seqid->list)) |
|
return; |
|
sequence = seqid->sequence; |
|
spin_lock(&sequence->lock); |
|
list_del_init(&seqid->list); |
|
if (!list_empty(&sequence->list)) { |
|
struct nfs_seqid *next; |
|
|
|
next = list_first_entry(&sequence->list, |
|
struct nfs_seqid, list); |
|
rpc_wake_up_queued_task(&sequence->wait, next->task); |
|
} |
|
spin_unlock(&sequence->lock); |
|
} |
|
|
|
void nfs_free_seqid(struct nfs_seqid *seqid) |
|
{ |
|
nfs_release_seqid(seqid); |
|
kfree(seqid); |
|
} |
|
|
|
/* |
|
* Increment the seqid if the OPEN/OPEN_DOWNGRADE/CLOSE succeeded, or |
|
* failed with a seqid incrementing error - |
|
* see comments nfs4.h:seqid_mutating_error() |
|
*/ |
|
static void nfs_increment_seqid(int status, struct nfs_seqid *seqid) |
|
{ |
|
switch (status) { |
|
case 0: |
|
break; |
|
case -NFS4ERR_BAD_SEQID: |
|
if (seqid->sequence->flags & NFS_SEQID_CONFIRMED) |
|
return; |
|
pr_warn_ratelimited("NFS: v4 server returned a bad" |
|
" sequence-id error on an" |
|
" unconfirmed sequence %p!\n", |
|
seqid->sequence); |
|
return; |
|
case -NFS4ERR_STALE_CLIENTID: |
|
case -NFS4ERR_STALE_STATEID: |
|
case -NFS4ERR_BAD_STATEID: |
|
case -NFS4ERR_BADXDR: |
|
case -NFS4ERR_RESOURCE: |
|
case -NFS4ERR_NOFILEHANDLE: |
|
case -NFS4ERR_MOVED: |
|
/* Non-seqid mutating errors */ |
|
return; |
|
} |
|
/* |
|
* Note: no locking needed as we are guaranteed to be first |
|
* on the sequence list |
|
*/ |
|
seqid->sequence->counter++; |
|
} |
|
|
|
void nfs_increment_open_seqid(int status, struct nfs_seqid *seqid) |
|
{ |
|
struct nfs4_state_owner *sp; |
|
|
|
if (seqid == NULL) |
|
return; |
|
|
|
sp = container_of(seqid->sequence, struct nfs4_state_owner, so_seqid); |
|
if (status == -NFS4ERR_BAD_SEQID) |
|
nfs4_reset_state_owner(sp); |
|
if (!nfs4_has_session(sp->so_server->nfs_client)) |
|
nfs_increment_seqid(status, seqid); |
|
} |
|
|
|
/* |
|
* Increment the seqid if the LOCK/LOCKU succeeded, or |
|
* failed with a seqid incrementing error - |
|
* see comments nfs4.h:seqid_mutating_error() |
|
*/ |
|
void nfs_increment_lock_seqid(int status, struct nfs_seqid *seqid) |
|
{ |
|
if (seqid != NULL) |
|
nfs_increment_seqid(status, seqid); |
|
} |
|
|
|
int nfs_wait_on_sequence(struct nfs_seqid *seqid, struct rpc_task *task) |
|
{ |
|
struct nfs_seqid_counter *sequence; |
|
int status = 0; |
|
|
|
if (seqid == NULL) |
|
goto out; |
|
sequence = seqid->sequence; |
|
spin_lock(&sequence->lock); |
|
seqid->task = task; |
|
if (list_empty(&seqid->list)) |
|
list_add_tail(&seqid->list, &sequence->list); |
|
if (list_first_entry(&sequence->list, struct nfs_seqid, list) == seqid) |
|
goto unlock; |
|
rpc_sleep_on(&sequence->wait, task, NULL); |
|
status = -EAGAIN; |
|
unlock: |
|
spin_unlock(&sequence->lock); |
|
out: |
|
return status; |
|
} |
|
|
|
static int nfs4_run_state_manager(void *); |
|
|
|
static void nfs4_clear_state_manager_bit(struct nfs_client *clp) |
|
{ |
|
smp_mb__before_atomic(); |
|
clear_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state); |
|
smp_mb__after_atomic(); |
|
wake_up_bit(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING); |
|
rpc_wake_up(&clp->cl_rpcwaitq); |
|
} |
|
|
|
/* |
|
* Schedule the nfs_client asynchronous state management routine |
|
*/ |
|
void nfs4_schedule_state_manager(struct nfs_client *clp) |
|
{ |
|
struct task_struct *task; |
|
char buf[INET6_ADDRSTRLEN + sizeof("-manager") + 1]; |
|
|
|
set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state); |
|
if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0) |
|
return; |
|
__module_get(THIS_MODULE); |
|
refcount_inc(&clp->cl_count); |
|
|
|
/* The rcu_read_lock() is not strictly necessary, as the state |
|
* manager is the only thread that ever changes the rpc_xprt |
|
* after it's initialized. At this point, we're single threaded. */ |
|
rcu_read_lock(); |
|
snprintf(buf, sizeof(buf), "%s-manager", |
|
rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)); |
|
rcu_read_unlock(); |
|
task = kthread_run(nfs4_run_state_manager, clp, "%s", buf); |
|
if (IS_ERR(task)) { |
|
printk(KERN_ERR "%s: kthread_run: %ld\n", |
|
__func__, PTR_ERR(task)); |
|
nfs4_clear_state_manager_bit(clp); |
|
nfs_put_client(clp); |
|
module_put(THIS_MODULE); |
|
} |
|
} |
|
|
|
/* |
|
* Schedule a lease recovery attempt |
|
*/ |
|
void nfs4_schedule_lease_recovery(struct nfs_client *clp) |
|
{ |
|
if (!clp) |
|
return; |
|
if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) |
|
set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); |
|
dprintk("%s: scheduling lease recovery for server %s\n", __func__, |
|
clp->cl_hostname); |
|
nfs4_schedule_state_manager(clp); |
|
} |
|
EXPORT_SYMBOL_GPL(nfs4_schedule_lease_recovery); |
|
|
|
/** |
|
* nfs4_schedule_migration_recovery - trigger migration recovery |
|
* |
|
* @server: FSID that is migrating |
|
* |
|
* Returns zero if recovery has started, otherwise a negative NFS4ERR |
|
* value is returned. |
|
*/ |
|
int nfs4_schedule_migration_recovery(const struct nfs_server *server) |
|
{ |
|
struct nfs_client *clp = server->nfs_client; |
|
|
|
if (server->fh_expire_type != NFS4_FH_PERSISTENT) { |
|
pr_err("NFS: volatile file handles not supported (server %s)\n", |
|
clp->cl_hostname); |
|
return -NFS4ERR_IO; |
|
} |
|
|
|
if (test_bit(NFS_MIG_FAILED, &server->mig_status)) |
|
return -NFS4ERR_IO; |
|
|
|
dprintk("%s: scheduling migration recovery for (%llx:%llx) on %s\n", |
|
__func__, |
|
(unsigned long long)server->fsid.major, |
|
(unsigned long long)server->fsid.minor, |
|
clp->cl_hostname); |
|
|
|
set_bit(NFS_MIG_IN_TRANSITION, |
|
&((struct nfs_server *)server)->mig_status); |
|
set_bit(NFS4CLNT_MOVED, &clp->cl_state); |
|
|
|
nfs4_schedule_state_manager(clp); |
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(nfs4_schedule_migration_recovery); |
|
|
|
/** |
|
* nfs4_schedule_lease_moved_recovery - start lease-moved recovery |
|
* |
|
* @clp: server to check for moved leases |
|
* |
|
*/ |
|
void nfs4_schedule_lease_moved_recovery(struct nfs_client *clp) |
|
{ |
|
dprintk("%s: scheduling lease-moved recovery for client ID %llx on %s\n", |
|
__func__, clp->cl_clientid, clp->cl_hostname); |
|
|
|
set_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state); |
|
nfs4_schedule_state_manager(clp); |
|
} |
|
EXPORT_SYMBOL_GPL(nfs4_schedule_lease_moved_recovery); |
|
|
|
int nfs4_wait_clnt_recover(struct nfs_client *clp) |
|
{ |
|
int res; |
|
|
|
might_sleep(); |
|
|
|
refcount_inc(&clp->cl_count); |
|
res = wait_on_bit_action(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING, |
|
nfs_wait_bit_killable, TASK_KILLABLE); |
|
if (res) |
|
goto out; |
|
if (clp->cl_cons_state < 0) |
|
res = clp->cl_cons_state; |
|
out: |
|
nfs_put_client(clp); |
|
return res; |
|
} |
|
|
|
int nfs4_client_recover_expired_lease(struct nfs_client *clp) |
|
{ |
|
unsigned int loop; |
|
int ret; |
|
|
|
for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) { |
|
ret = nfs4_wait_clnt_recover(clp); |
|
if (ret != 0) |
|
break; |
|
if (!test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) && |
|
!test_bit(NFS4CLNT_CHECK_LEASE,&clp->cl_state)) |
|
break; |
|
nfs4_schedule_state_manager(clp); |
|
ret = -EIO; |
|
} |
|
return ret; |
|
} |
|
|
|
/* |
|
* nfs40_handle_cb_pathdown - return all delegations after NFS4ERR_CB_PATH_DOWN |
|
* @clp: client to process |
|
* |
|
* Set the NFS4CLNT_LEASE_EXPIRED state in order to force a |
|
* resend of the SETCLIENTID and hence re-establish the |
|
* callback channel. Then return all existing delegations. |
|
*/ |
|
static void nfs40_handle_cb_pathdown(struct nfs_client *clp) |
|
{ |
|
set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); |
|
nfs_expire_all_delegations(clp); |
|
dprintk("%s: handling CB_PATHDOWN recovery for server %s\n", __func__, |
|
clp->cl_hostname); |
|
} |
|
|
|
void nfs4_schedule_path_down_recovery(struct nfs_client *clp) |
|
{ |
|
nfs40_handle_cb_pathdown(clp); |
|
nfs4_schedule_state_manager(clp); |
|
} |
|
|
|
static int nfs4_state_mark_reclaim_reboot(struct nfs_client *clp, struct nfs4_state *state) |
|
{ |
|
|
|
if (!nfs4_valid_open_stateid(state)) |
|
return 0; |
|
set_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); |
|
/* Don't recover state that expired before the reboot */ |
|
if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags)) { |
|
clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); |
|
return 0; |
|
} |
|
set_bit(NFS_OWNER_RECLAIM_REBOOT, &state->owner->so_flags); |
|
set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state); |
|
return 1; |
|
} |
|
|
|
int nfs4_state_mark_reclaim_nograce(struct nfs_client *clp, struct nfs4_state *state) |
|
{ |
|
if (!nfs4_valid_open_stateid(state)) |
|
return 0; |
|
set_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags); |
|
clear_bit(NFS_STATE_RECLAIM_REBOOT, &state->flags); |
|
set_bit(NFS_OWNER_RECLAIM_NOGRACE, &state->owner->so_flags); |
|
set_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state); |
|
return 1; |
|
} |
|
|
|
int nfs4_schedule_stateid_recovery(const struct nfs_server *server, struct nfs4_state *state) |
|
{ |
|
struct nfs_client *clp = server->nfs_client; |
|
|
|
if (!nfs4_state_mark_reclaim_nograce(clp, state)) |
|
return -EBADF; |
|
nfs_inode_find_delegation_state_and_recover(state->inode, |
|
&state->stateid); |
|
dprintk("%s: scheduling stateid recovery for server %s\n", __func__, |
|
clp->cl_hostname); |
|
nfs4_schedule_state_manager(clp); |
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(nfs4_schedule_stateid_recovery); |
|
|
|
static struct nfs4_lock_state * |
|
nfs_state_find_lock_state_by_stateid(struct nfs4_state *state, |
|
const nfs4_stateid *stateid) |
|
{ |
|
struct nfs4_lock_state *pos; |
|
|
|
list_for_each_entry(pos, &state->lock_states, ls_locks) { |
|
if (!test_bit(NFS_LOCK_INITIALIZED, &pos->ls_flags)) |
|
continue; |
|
if (nfs4_stateid_match_or_older(&pos->ls_stateid, stateid)) |
|
return pos; |
|
} |
|
return NULL; |
|
} |
|
|
|
static bool nfs_state_lock_state_matches_stateid(struct nfs4_state *state, |
|
const nfs4_stateid *stateid) |
|
{ |
|
bool found = false; |
|
|
|
if (test_bit(LK_STATE_IN_USE, &state->flags)) { |
|
spin_lock(&state->state_lock); |
|
if (nfs_state_find_lock_state_by_stateid(state, stateid)) |
|
found = true; |
|
spin_unlock(&state->state_lock); |
|
} |
|
return found; |
|
} |
|
|
|
void nfs_inode_find_state_and_recover(struct inode *inode, |
|
const nfs4_stateid *stateid) |
|
{ |
|
struct nfs_client *clp = NFS_SERVER(inode)->nfs_client; |
|
struct nfs_inode *nfsi = NFS_I(inode); |
|
struct nfs_open_context *ctx; |
|
struct nfs4_state *state; |
|
bool found = false; |
|
|
|
rcu_read_lock(); |
|
list_for_each_entry_rcu(ctx, &nfsi->open_files, list) { |
|
state = ctx->state; |
|
if (state == NULL) |
|
continue; |
|
if (nfs4_stateid_match_or_older(&state->stateid, stateid) && |
|
nfs4_state_mark_reclaim_nograce(clp, state)) { |
|
found = true; |
|
continue; |
|
} |
|
if (test_bit(NFS_OPEN_STATE, &state->flags) && |
|
nfs4_stateid_match_or_older(&state->open_stateid, stateid) && |
|
nfs4_state_mark_reclaim_nograce(clp, state)) { |
|
found = true; |
|
continue; |
|
} |
|
if (nfs_state_lock_state_matches_stateid(state, stateid) && |
|
nfs4_state_mark_reclaim_nograce(clp, state)) |
|
found = true; |
|
} |
|
rcu_read_unlock(); |
|
|
|
nfs_inode_find_delegation_state_and_recover(inode, stateid); |
|
if (found) |
|
nfs4_schedule_state_manager(clp); |
|
} |
|
|
|
static void nfs4_state_mark_open_context_bad(struct nfs4_state *state, int err) |
|
{ |
|
struct inode *inode = state->inode; |
|
struct nfs_inode *nfsi = NFS_I(inode); |
|
struct nfs_open_context *ctx; |
|
|
|
rcu_read_lock(); |
|
list_for_each_entry_rcu(ctx, &nfsi->open_files, list) { |
|
if (ctx->state != state) |
|
continue; |
|
set_bit(NFS_CONTEXT_BAD, &ctx->flags); |
|
pr_warn("NFSv4: state recovery failed for open file %pd2, " |
|
"error = %d\n", ctx->dentry, err); |
|
} |
|
rcu_read_unlock(); |
|
} |
|
|
|
static void nfs4_state_mark_recovery_failed(struct nfs4_state *state, int error) |
|
{ |
|
set_bit(NFS_STATE_RECOVERY_FAILED, &state->flags); |
|
nfs4_state_mark_open_context_bad(state, error); |
|
} |
|
|
|
|
|
static int nfs4_reclaim_locks(struct nfs4_state *state, const struct nfs4_state_recovery_ops *ops) |
|
{ |
|
struct inode *inode = state->inode; |
|
struct nfs_inode *nfsi = NFS_I(inode); |
|
struct file_lock *fl; |
|
struct nfs4_lock_state *lsp; |
|
int status = 0; |
|
struct file_lock_context *flctx = inode->i_flctx; |
|
struct list_head *list; |
|
|
|
if (flctx == NULL) |
|
return 0; |
|
|
|
list = &flctx->flc_posix; |
|
|
|
/* Guard against delegation returns and new lock/unlock calls */ |
|
down_write(&nfsi->rwsem); |
|
spin_lock(&flctx->flc_lock); |
|
restart: |
|
list_for_each_entry(fl, list, fl_list) { |
|
if (nfs_file_open_context(fl->fl_file)->state != state) |
|
continue; |
|
spin_unlock(&flctx->flc_lock); |
|
status = ops->recover_lock(state, fl); |
|
switch (status) { |
|
case 0: |
|
break; |
|
case -ETIMEDOUT: |
|
case -ESTALE: |
|
case -NFS4ERR_ADMIN_REVOKED: |
|
case -NFS4ERR_STALE_STATEID: |
|
case -NFS4ERR_BAD_STATEID: |
|
case -NFS4ERR_EXPIRED: |
|
case -NFS4ERR_NO_GRACE: |
|
case -NFS4ERR_STALE_CLIENTID: |
|
case -NFS4ERR_BADSESSION: |
|
case -NFS4ERR_BADSLOT: |
|
case -NFS4ERR_BAD_HIGH_SLOT: |
|
case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: |
|
goto out; |
|
default: |
|
pr_err("NFS: %s: unhandled error %d\n", |
|
__func__, status); |
|
fallthrough; |
|
case -ENOMEM: |
|
case -NFS4ERR_DENIED: |
|
case -NFS4ERR_RECLAIM_BAD: |
|
case -NFS4ERR_RECLAIM_CONFLICT: |
|
lsp = fl->fl_u.nfs4_fl.owner; |
|
if (lsp) |
|
set_bit(NFS_LOCK_LOST, &lsp->ls_flags); |
|
status = 0; |
|
} |
|
spin_lock(&flctx->flc_lock); |
|
} |
|
if (list == &flctx->flc_posix) { |
|
list = &flctx->flc_flock; |
|
goto restart; |
|
} |
|
spin_unlock(&flctx->flc_lock); |
|
out: |
|
up_write(&nfsi->rwsem); |
|
return status; |
|
} |
|
|
|
#ifdef CONFIG_NFS_V4_2 |
|
static void nfs42_complete_copies(struct nfs4_state_owner *sp, struct nfs4_state *state) |
|
{ |
|
struct nfs4_copy_state *copy; |
|
|
|
if (!test_bit(NFS_CLNT_DST_SSC_COPY_STATE, &state->flags) && |
|
!test_bit(NFS_CLNT_SRC_SSC_COPY_STATE, &state->flags)) |
|
return; |
|
|
|
spin_lock(&sp->so_server->nfs_client->cl_lock); |
|
list_for_each_entry(copy, &sp->so_server->ss_copies, copies) { |
|
if ((test_bit(NFS_CLNT_DST_SSC_COPY_STATE, &state->flags) && |
|
!nfs4_stateid_match_other(&state->stateid, |
|
©->parent_dst_state->stateid))) |
|
continue; |
|
copy->flags = 1; |
|
if (test_and_clear_bit(NFS_CLNT_DST_SSC_COPY_STATE, |
|
&state->flags)) { |
|
clear_bit(NFS_CLNT_SRC_SSC_COPY_STATE, &state->flags); |
|
complete(©->completion); |
|
} |
|
} |
|
list_for_each_entry(copy, &sp->so_server->ss_copies, src_copies) { |
|
if ((test_bit(NFS_CLNT_SRC_SSC_COPY_STATE, &state->flags) && |
|
!nfs4_stateid_match_other(&state->stateid, |
|
©->parent_src_state->stateid))) |
|
continue; |
|
copy->flags = 1; |
|
if (test_and_clear_bit(NFS_CLNT_DST_SSC_COPY_STATE, |
|
&state->flags)) |
|
complete(©->completion); |
|
} |
|
spin_unlock(&sp->so_server->nfs_client->cl_lock); |
|
} |
|
#else /* !CONFIG_NFS_V4_2 */ |
|
static inline void nfs42_complete_copies(struct nfs4_state_owner *sp, |
|
struct nfs4_state *state) |
|
{ |
|
} |
|
#endif /* CONFIG_NFS_V4_2 */ |
|
|
|
static int __nfs4_reclaim_open_state(struct nfs4_state_owner *sp, struct nfs4_state *state, |
|
const struct nfs4_state_recovery_ops *ops) |
|
{ |
|
struct nfs4_lock_state *lock; |
|
int status; |
|
|
|
status = ops->recover_open(sp, state); |
|
if (status < 0) |
|
return status; |
|
|
|
status = nfs4_reclaim_locks(state, ops); |
|
if (status < 0) |
|
return status; |
|
|
|
if (!test_bit(NFS_DELEGATED_STATE, &state->flags)) { |
|
spin_lock(&state->state_lock); |
|
list_for_each_entry(lock, &state->lock_states, ls_locks) { |
|
trace_nfs4_state_lock_reclaim(state, lock); |
|
if (!test_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags)) |
|
pr_warn_ratelimited("NFS: %s: Lock reclaim failed!\n", __func__); |
|
} |
|
spin_unlock(&state->state_lock); |
|
} |
|
|
|
nfs42_complete_copies(sp, state); |
|
clear_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags); |
|
return status; |
|
} |
|
|
|
static int nfs4_reclaim_open_state(struct nfs4_state_owner *sp, const struct nfs4_state_recovery_ops *ops) |
|
{ |
|
struct nfs4_state *state; |
|
unsigned int loop = 0; |
|
int status = 0; |
|
#ifdef CONFIG_NFS_V4_2 |
|
bool found_ssc_copy_state = false; |
|
#endif /* CONFIG_NFS_V4_2 */ |
|
|
|
/* Note: we rely on the sp->so_states list being ordered |
|
* so that we always reclaim open(O_RDWR) and/or open(O_WRITE) |
|
* states first. |
|
* This is needed to ensure that the server won't give us any |
|
* read delegations that we have to return if, say, we are |
|
* recovering after a network partition or a reboot from a |
|
* server that doesn't support a grace period. |
|
*/ |
|
spin_lock(&sp->so_lock); |
|
raw_write_seqcount_begin(&sp->so_reclaim_seqcount); |
|
restart: |
|
list_for_each_entry(state, &sp->so_states, open_states) { |
|
if (!test_and_clear_bit(ops->state_flag_bit, &state->flags)) |
|
continue; |
|
if (!nfs4_valid_open_stateid(state)) |
|
continue; |
|
if (state->state == 0) |
|
continue; |
|
#ifdef CONFIG_NFS_V4_2 |
|
if (test_bit(NFS_SRV_SSC_COPY_STATE, &state->flags)) { |
|
nfs4_state_mark_recovery_failed(state, -EIO); |
|
found_ssc_copy_state = true; |
|
continue; |
|
} |
|
#endif /* CONFIG_NFS_V4_2 */ |
|
refcount_inc(&state->count); |
|
spin_unlock(&sp->so_lock); |
|
status = __nfs4_reclaim_open_state(sp, state, ops); |
|
|
|
switch (status) { |
|
default: |
|
if (status >= 0) { |
|
loop = 0; |
|
break; |
|
} |
|
printk(KERN_ERR "NFS: %s: unhandled error %d\n", __func__, status); |
|
fallthrough; |
|
case -ENOENT: |
|
case -ENOMEM: |
|
case -EACCES: |
|
case -EROFS: |
|
case -EIO: |
|
case -ESTALE: |
|
/* Open state on this file cannot be recovered */ |
|
nfs4_state_mark_recovery_failed(state, status); |
|
break; |
|
case -EAGAIN: |
|
ssleep(1); |
|
if (loop++ < 10) { |
|
set_bit(ops->state_flag_bit, &state->flags); |
|
break; |
|
} |
|
fallthrough; |
|
case -NFS4ERR_ADMIN_REVOKED: |
|
case -NFS4ERR_STALE_STATEID: |
|
case -NFS4ERR_OLD_STATEID: |
|
case -NFS4ERR_BAD_STATEID: |
|
case -NFS4ERR_RECLAIM_BAD: |
|
case -NFS4ERR_RECLAIM_CONFLICT: |
|
nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state); |
|
break; |
|
case -NFS4ERR_EXPIRED: |
|
case -NFS4ERR_NO_GRACE: |
|
nfs4_state_mark_reclaim_nograce(sp->so_server->nfs_client, state); |
|
fallthrough; |
|
case -NFS4ERR_STALE_CLIENTID: |
|
case -NFS4ERR_BADSESSION: |
|
case -NFS4ERR_BADSLOT: |
|
case -NFS4ERR_BAD_HIGH_SLOT: |
|
case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: |
|
case -ETIMEDOUT: |
|
goto out_err; |
|
} |
|
nfs4_put_open_state(state); |
|
spin_lock(&sp->so_lock); |
|
goto restart; |
|
} |
|
raw_write_seqcount_end(&sp->so_reclaim_seqcount); |
|
spin_unlock(&sp->so_lock); |
|
#ifdef CONFIG_NFS_V4_2 |
|
if (found_ssc_copy_state) |
|
return -EIO; |
|
#endif /* CONFIG_NFS_V4_2 */ |
|
return 0; |
|
out_err: |
|
nfs4_put_open_state(state); |
|
spin_lock(&sp->so_lock); |
|
raw_write_seqcount_end(&sp->so_reclaim_seqcount); |
|
spin_unlock(&sp->so_lock); |
|
return status; |
|
} |
|
|
|
static void nfs4_clear_open_state(struct nfs4_state *state) |
|
{ |
|
struct nfs4_lock_state *lock; |
|
|
|
clear_bit(NFS_DELEGATED_STATE, &state->flags); |
|
clear_bit(NFS_O_RDONLY_STATE, &state->flags); |
|
clear_bit(NFS_O_WRONLY_STATE, &state->flags); |
|
clear_bit(NFS_O_RDWR_STATE, &state->flags); |
|
spin_lock(&state->state_lock); |
|
list_for_each_entry(lock, &state->lock_states, ls_locks) { |
|
lock->ls_seqid.flags = 0; |
|
clear_bit(NFS_LOCK_INITIALIZED, &lock->ls_flags); |
|
} |
|
spin_unlock(&state->state_lock); |
|
} |
|
|
|
static void nfs4_reset_seqids(struct nfs_server *server, |
|
int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state)) |
|
{ |
|
struct nfs_client *clp = server->nfs_client; |
|
struct nfs4_state_owner *sp; |
|
struct rb_node *pos; |
|
struct nfs4_state *state; |
|
|
|
spin_lock(&clp->cl_lock); |
|
for (pos = rb_first(&server->state_owners); |
|
pos != NULL; |
|
pos = rb_next(pos)) { |
|
sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); |
|
sp->so_seqid.flags = 0; |
|
spin_lock(&sp->so_lock); |
|
list_for_each_entry(state, &sp->so_states, open_states) { |
|
if (mark_reclaim(clp, state)) |
|
nfs4_clear_open_state(state); |
|
} |
|
spin_unlock(&sp->so_lock); |
|
} |
|
spin_unlock(&clp->cl_lock); |
|
} |
|
|
|
static void nfs4_state_mark_reclaim_helper(struct nfs_client *clp, |
|
int (*mark_reclaim)(struct nfs_client *clp, struct nfs4_state *state)) |
|
{ |
|
struct nfs_server *server; |
|
|
|
rcu_read_lock(); |
|
list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) |
|
nfs4_reset_seqids(server, mark_reclaim); |
|
rcu_read_unlock(); |
|
} |
|
|
|
static void nfs4_state_start_reclaim_reboot(struct nfs_client *clp) |
|
{ |
|
/* Mark all delegations for reclaim */ |
|
nfs_delegation_mark_reclaim(clp); |
|
nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_reboot); |
|
} |
|
|
|
static int nfs4_reclaim_complete(struct nfs_client *clp, |
|
const struct nfs4_state_recovery_ops *ops, |
|
const struct cred *cred) |
|
{ |
|
/* Notify the server we're done reclaiming our state */ |
|
if (ops->reclaim_complete) |
|
return ops->reclaim_complete(clp, cred); |
|
return 0; |
|
} |
|
|
|
static void nfs4_clear_reclaim_server(struct nfs_server *server) |
|
{ |
|
struct nfs_client *clp = server->nfs_client; |
|
struct nfs4_state_owner *sp; |
|
struct rb_node *pos; |
|
struct nfs4_state *state; |
|
|
|
spin_lock(&clp->cl_lock); |
|
for (pos = rb_first(&server->state_owners); |
|
pos != NULL; |
|
pos = rb_next(pos)) { |
|
sp = rb_entry(pos, struct nfs4_state_owner, so_server_node); |
|
spin_lock(&sp->so_lock); |
|
list_for_each_entry(state, &sp->so_states, open_states) { |
|
if (!test_and_clear_bit(NFS_STATE_RECLAIM_REBOOT, |
|
&state->flags)) |
|
continue; |
|
nfs4_state_mark_reclaim_nograce(clp, state); |
|
} |
|
spin_unlock(&sp->so_lock); |
|
} |
|
spin_unlock(&clp->cl_lock); |
|
} |
|
|
|
static int nfs4_state_clear_reclaim_reboot(struct nfs_client *clp) |
|
{ |
|
struct nfs_server *server; |
|
|
|
if (!test_and_clear_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) |
|
return 0; |
|
|
|
rcu_read_lock(); |
|
list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) |
|
nfs4_clear_reclaim_server(server); |
|
rcu_read_unlock(); |
|
|
|
nfs_delegation_reap_unclaimed(clp); |
|
return 1; |
|
} |
|
|
|
static void nfs4_state_end_reclaim_reboot(struct nfs_client *clp) |
|
{ |
|
const struct nfs4_state_recovery_ops *ops; |
|
const struct cred *cred; |
|
int err; |
|
|
|
if (!nfs4_state_clear_reclaim_reboot(clp)) |
|
return; |
|
ops = clp->cl_mvops->reboot_recovery_ops; |
|
cred = nfs4_get_clid_cred(clp); |
|
err = nfs4_reclaim_complete(clp, ops, cred); |
|
put_cred(cred); |
|
if (err == -NFS4ERR_CONN_NOT_BOUND_TO_SESSION) |
|
set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state); |
|
} |
|
|
|
static void nfs4_state_start_reclaim_nograce(struct nfs_client *clp) |
|
{ |
|
nfs_mark_test_expired_all_delegations(clp); |
|
nfs4_state_mark_reclaim_helper(clp, nfs4_state_mark_reclaim_nograce); |
|
} |
|
|
|
static int nfs4_recovery_handle_error(struct nfs_client *clp, int error) |
|
{ |
|
switch (error) { |
|
case 0: |
|
break; |
|
case -NFS4ERR_CB_PATH_DOWN: |
|
nfs40_handle_cb_pathdown(clp); |
|
break; |
|
case -NFS4ERR_NO_GRACE: |
|
nfs4_state_end_reclaim_reboot(clp); |
|
break; |
|
case -NFS4ERR_STALE_CLIENTID: |
|
set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); |
|
nfs4_state_start_reclaim_reboot(clp); |
|
break; |
|
case -NFS4ERR_EXPIRED: |
|
set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); |
|
nfs4_state_start_reclaim_nograce(clp); |
|
break; |
|
case -NFS4ERR_BADSESSION: |
|
case -NFS4ERR_BADSLOT: |
|
case -NFS4ERR_BAD_HIGH_SLOT: |
|
case -NFS4ERR_DEADSESSION: |
|
case -NFS4ERR_SEQ_FALSE_RETRY: |
|
case -NFS4ERR_SEQ_MISORDERED: |
|
set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); |
|
/* Zero session reset errors */ |
|
break; |
|
case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: |
|
set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state); |
|
break; |
|
default: |
|
dprintk("%s: failed to handle error %d for server %s\n", |
|
__func__, error, clp->cl_hostname); |
|
return error; |
|
} |
|
dprintk("%s: handled error %d for server %s\n", __func__, error, |
|
clp->cl_hostname); |
|
return 0; |
|
} |
|
|
|
static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recovery_ops *ops) |
|
{ |
|
struct nfs4_state_owner *sp; |
|
struct nfs_server *server; |
|
struct rb_node *pos; |
|
LIST_HEAD(freeme); |
|
int status = 0; |
|
|
|
restart: |
|
rcu_read_lock(); |
|
list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
|
nfs4_purge_state_owners(server, &freeme); |
|
spin_lock(&clp->cl_lock); |
|
for (pos = rb_first(&server->state_owners); |
|
pos != NULL; |
|
pos = rb_next(pos)) { |
|
sp = rb_entry(pos, |
|
struct nfs4_state_owner, so_server_node); |
|
if (!test_and_clear_bit(ops->owner_flag_bit, |
|
&sp->so_flags)) |
|
continue; |
|
if (!atomic_inc_not_zero(&sp->so_count)) |
|
continue; |
|
spin_unlock(&clp->cl_lock); |
|
rcu_read_unlock(); |
|
|
|
status = nfs4_reclaim_open_state(sp, ops); |
|
if (status < 0) { |
|
set_bit(ops->owner_flag_bit, &sp->so_flags); |
|
nfs4_put_state_owner(sp); |
|
status = nfs4_recovery_handle_error(clp, status); |
|
return (status != 0) ? status : -EAGAIN; |
|
} |
|
|
|
nfs4_put_state_owner(sp); |
|
goto restart; |
|
} |
|
spin_unlock(&clp->cl_lock); |
|
} |
|
rcu_read_unlock(); |
|
nfs4_free_state_owners(&freeme); |
|
return 0; |
|
} |
|
|
|
static int nfs4_check_lease(struct nfs_client *clp) |
|
{ |
|
const struct cred *cred; |
|
const struct nfs4_state_maintenance_ops *ops = |
|
clp->cl_mvops->state_renewal_ops; |
|
int status; |
|
|
|
/* Is the client already known to have an expired lease? */ |
|
if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) |
|
return 0; |
|
cred = ops->get_state_renewal_cred(clp); |
|
if (cred == NULL) { |
|
cred = nfs4_get_clid_cred(clp); |
|
status = -ENOKEY; |
|
if (cred == NULL) |
|
goto out; |
|
} |
|
status = ops->renew_lease(clp, cred); |
|
put_cred(cred); |
|
if (status == -ETIMEDOUT) { |
|
set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); |
|
return 0; |
|
} |
|
out: |
|
return nfs4_recovery_handle_error(clp, status); |
|
} |
|
|
|
/* Set NFS4CLNT_LEASE_EXPIRED and reclaim reboot state for all v4.0 errors |
|
* and for recoverable errors on EXCHANGE_ID for v4.1 |
|
*/ |
|
static int nfs4_handle_reclaim_lease_error(struct nfs_client *clp, int status) |
|
{ |
|
switch (status) { |
|
case -NFS4ERR_SEQ_MISORDERED: |
|
if (test_and_set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) |
|
return -ESERVERFAULT; |
|
/* Lease confirmation error: retry after purging the lease */ |
|
ssleep(1); |
|
clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); |
|
break; |
|
case -NFS4ERR_STALE_CLIENTID: |
|
clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); |
|
nfs4_state_start_reclaim_reboot(clp); |
|
break; |
|
case -NFS4ERR_CLID_INUSE: |
|
pr_err("NFS: Server %s reports our clientid is in use\n", |
|
clp->cl_hostname); |
|
nfs_mark_client_ready(clp, -EPERM); |
|
clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); |
|
return -EPERM; |
|
case -EACCES: |
|
case -NFS4ERR_DELAY: |
|
case -EAGAIN: |
|
ssleep(1); |
|
break; |
|
|
|
case -NFS4ERR_MINOR_VERS_MISMATCH: |
|
if (clp->cl_cons_state == NFS_CS_SESSION_INITING) |
|
nfs_mark_client_ready(clp, -EPROTONOSUPPORT); |
|
dprintk("%s: exit with error %d for server %s\n", |
|
__func__, -EPROTONOSUPPORT, clp->cl_hostname); |
|
return -EPROTONOSUPPORT; |
|
case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery |
|
* in nfs4_exchange_id */ |
|
default: |
|
dprintk("%s: exit with error %d for server %s\n", __func__, |
|
status, clp->cl_hostname); |
|
return status; |
|
} |
|
set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); |
|
dprintk("%s: handled error %d for server %s\n", __func__, status, |
|
clp->cl_hostname); |
|
return 0; |
|
} |
|
|
|
static int nfs4_establish_lease(struct nfs_client *clp) |
|
{ |
|
const struct cred *cred; |
|
const struct nfs4_state_recovery_ops *ops = |
|
clp->cl_mvops->reboot_recovery_ops; |
|
int status; |
|
|
|
status = nfs4_begin_drain_session(clp); |
|
if (status != 0) |
|
return status; |
|
cred = nfs4_get_clid_cred(clp); |
|
if (cred == NULL) |
|
return -ENOENT; |
|
status = ops->establish_clid(clp, cred); |
|
put_cred(cred); |
|
if (status != 0) |
|
return status; |
|
pnfs_destroy_all_layouts(clp); |
|
return 0; |
|
} |
|
|
|
/* |
|
* Returns zero or a negative errno. NFS4ERR values are converted |
|
* to local errno values. |
|
*/ |
|
static int nfs4_reclaim_lease(struct nfs_client *clp) |
|
{ |
|
int status; |
|
|
|
status = nfs4_establish_lease(clp); |
|
if (status < 0) |
|
return nfs4_handle_reclaim_lease_error(clp, status); |
|
if (test_and_clear_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state)) |
|
nfs4_state_start_reclaim_nograce(clp); |
|
if (!test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) |
|
set_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state); |
|
clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); |
|
clear_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); |
|
return 0; |
|
} |
|
|
|
static int nfs4_purge_lease(struct nfs_client *clp) |
|
{ |
|
int status; |
|
|
|
status = nfs4_establish_lease(clp); |
|
if (status < 0) |
|
return nfs4_handle_reclaim_lease_error(clp, status); |
|
clear_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state); |
|
set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state); |
|
nfs4_state_start_reclaim_nograce(clp); |
|
return 0; |
|
} |
|
|
|
/* |
|
* Try remote migration of one FSID from a source server to a |
|
* destination server. The source server provides a list of |
|
* potential destinations. |
|
* |
|
* Returns zero or a negative NFS4ERR status code. |
|
*/ |
|
static int nfs4_try_migration(struct nfs_server *server, const struct cred *cred) |
|
{ |
|
struct nfs_client *clp = server->nfs_client; |
|
struct nfs4_fs_locations *locations = NULL; |
|
struct inode *inode; |
|
struct page *page; |
|
int status, result; |
|
|
|
dprintk("--> %s: FSID %llx:%llx on \"%s\"\n", __func__, |
|
(unsigned long long)server->fsid.major, |
|
(unsigned long long)server->fsid.minor, |
|
clp->cl_hostname); |
|
|
|
result = 0; |
|
page = alloc_page(GFP_KERNEL); |
|
locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL); |
|
if (page == NULL || locations == NULL) { |
|
dprintk("<-- %s: no memory\n", __func__); |
|
goto out; |
|
} |
|
|
|
inode = d_inode(server->super->s_root); |
|
result = nfs4_proc_get_locations(inode, locations, page, cred); |
|
if (result) { |
|
dprintk("<-- %s: failed to retrieve fs_locations: %d\n", |
|
__func__, result); |
|
goto out; |
|
} |
|
|
|
result = -NFS4ERR_NXIO; |
|
if (!(locations->fattr.valid & NFS_ATTR_FATTR_V4_LOCATIONS)) { |
|
dprintk("<-- %s: No fs_locations data, migration skipped\n", |
|
__func__); |
|
goto out; |
|
} |
|
|
|
status = nfs4_begin_drain_session(clp); |
|
if (status != 0) { |
|
result = status; |
|
goto out; |
|
} |
|
|
|
status = nfs4_replace_transport(server, locations); |
|
if (status != 0) { |
|
dprintk("<-- %s: failed to replace transport: %d\n", |
|
__func__, status); |
|
goto out; |
|
} |
|
|
|
result = 0; |
|
dprintk("<-- %s: migration succeeded\n", __func__); |
|
|
|
out: |
|
if (page != NULL) |
|
__free_page(page); |
|
kfree(locations); |
|
if (result) { |
|
pr_err("NFS: migration recovery failed (server %s)\n", |
|
clp->cl_hostname); |
|
set_bit(NFS_MIG_FAILED, &server->mig_status); |
|
} |
|
return result; |
|
} |
|
|
|
/* |
|
* Returns zero or a negative NFS4ERR status code. |
|
*/ |
|
static int nfs4_handle_migration(struct nfs_client *clp) |
|
{ |
|
const struct nfs4_state_maintenance_ops *ops = |
|
clp->cl_mvops->state_renewal_ops; |
|
struct nfs_server *server; |
|
const struct cred *cred; |
|
|
|
dprintk("%s: migration reported on \"%s\"\n", __func__, |
|
clp->cl_hostname); |
|
|
|
cred = ops->get_state_renewal_cred(clp); |
|
if (cred == NULL) |
|
return -NFS4ERR_NOENT; |
|
|
|
clp->cl_mig_gen++; |
|
restart: |
|
rcu_read_lock(); |
|
list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
|
int status; |
|
|
|
if (server->mig_gen == clp->cl_mig_gen) |
|
continue; |
|
server->mig_gen = clp->cl_mig_gen; |
|
|
|
if (!test_and_clear_bit(NFS_MIG_IN_TRANSITION, |
|
&server->mig_status)) |
|
continue; |
|
|
|
rcu_read_unlock(); |
|
status = nfs4_try_migration(server, cred); |
|
if (status < 0) { |
|
put_cred(cred); |
|
return status; |
|
} |
|
goto restart; |
|
} |
|
rcu_read_unlock(); |
|
put_cred(cred); |
|
return 0; |
|
} |
|
|
|
/* |
|
* Test each nfs_server on the clp's cl_superblocks list to see |
|
* if it's moved to another server. Stop when the server no longer |
|
* returns NFS4ERR_LEASE_MOVED. |
|
*/ |
|
static int nfs4_handle_lease_moved(struct nfs_client *clp) |
|
{ |
|
const struct nfs4_state_maintenance_ops *ops = |
|
clp->cl_mvops->state_renewal_ops; |
|
struct nfs_server *server; |
|
const struct cred *cred; |
|
|
|
dprintk("%s: lease moved reported on \"%s\"\n", __func__, |
|
clp->cl_hostname); |
|
|
|
cred = ops->get_state_renewal_cred(clp); |
|
if (cred == NULL) |
|
return -NFS4ERR_NOENT; |
|
|
|
clp->cl_mig_gen++; |
|
restart: |
|
rcu_read_lock(); |
|
list_for_each_entry_rcu(server, &clp->cl_superblocks, client_link) { |
|
struct inode *inode; |
|
int status; |
|
|
|
if (server->mig_gen == clp->cl_mig_gen) |
|
continue; |
|
server->mig_gen = clp->cl_mig_gen; |
|
|
|
rcu_read_unlock(); |
|
|
|
inode = d_inode(server->super->s_root); |
|
status = nfs4_proc_fsid_present(inode, cred); |
|
if (status != -NFS4ERR_MOVED) |
|
goto restart; /* wasn't this one */ |
|
if (nfs4_try_migration(server, cred) == -NFS4ERR_LEASE_MOVED) |
|
goto restart; /* there are more */ |
|
goto out; |
|
} |
|
rcu_read_unlock(); |
|
|
|
out: |
|
put_cred(cred); |
|
return 0; |
|
} |
|
|
|
/** |
|
* nfs4_discover_server_trunking - Detect server IP address trunking |
|
* |
|
* @clp: nfs_client under test |
|
* @result: OUT: found nfs_client, or clp |
|
* |
|
* Returns zero or a negative errno. If zero is returned, |
|
* an nfs_client pointer is planted in "result". |
|
* |
|
* Note: since we are invoked in process context, and |
|
* not from inside the state manager, we cannot use |
|
* nfs4_handle_reclaim_lease_error(). |
|
*/ |
|
int nfs4_discover_server_trunking(struct nfs_client *clp, |
|
struct nfs_client **result) |
|
{ |
|
const struct nfs4_state_recovery_ops *ops = |
|
clp->cl_mvops->reboot_recovery_ops; |
|
struct rpc_clnt *clnt; |
|
const struct cred *cred; |
|
int i, status; |
|
|
|
dprintk("NFS: %s: testing '%s'\n", __func__, clp->cl_hostname); |
|
|
|
clnt = clp->cl_rpcclient; |
|
i = 0; |
|
|
|
mutex_lock(&nfs_clid_init_mutex); |
|
again: |
|
status = -ENOENT; |
|
cred = nfs4_get_clid_cred(clp); |
|
if (cred == NULL) |
|
goto out_unlock; |
|
|
|
status = ops->detect_trunking(clp, result, cred); |
|
put_cred(cred); |
|
switch (status) { |
|
case 0: |
|
case -EINTR: |
|
case -ERESTARTSYS: |
|
break; |
|
case -ETIMEDOUT: |
|
if (clnt->cl_softrtry) |
|
break; |
|
fallthrough; |
|
case -NFS4ERR_DELAY: |
|
case -EAGAIN: |
|
ssleep(1); |
|
fallthrough; |
|
case -NFS4ERR_STALE_CLIENTID: |
|
dprintk("NFS: %s after status %d, retrying\n", |
|
__func__, status); |
|
goto again; |
|
case -EACCES: |
|
if (i++ == 0) { |
|
nfs4_root_machine_cred(clp); |
|
goto again; |
|
} |
|
if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX) |
|
break; |
|
fallthrough; |
|
case -NFS4ERR_CLID_INUSE: |
|
case -NFS4ERR_WRONGSEC: |
|
/* No point in retrying if we already used RPC_AUTH_UNIX */ |
|
if (clnt->cl_auth->au_flavor == RPC_AUTH_UNIX) { |
|
status = -EPERM; |
|
break; |
|
} |
|
clnt = rpc_clone_client_set_auth(clnt, RPC_AUTH_UNIX); |
|
if (IS_ERR(clnt)) { |
|
status = PTR_ERR(clnt); |
|
break; |
|
} |
|
/* Note: this is safe because we haven't yet marked the |
|
* client as ready, so we are the only user of |
|
* clp->cl_rpcclient |
|
*/ |
|
clnt = xchg(&clp->cl_rpcclient, clnt); |
|
rpc_shutdown_client(clnt); |
|
clnt = clp->cl_rpcclient; |
|
goto again; |
|
|
|
case -NFS4ERR_MINOR_VERS_MISMATCH: |
|
status = -EPROTONOSUPPORT; |
|
break; |
|
|
|
case -EKEYEXPIRED: |
|
case -NFS4ERR_NOT_SAME: /* FixMe: implement recovery |
|
* in nfs4_exchange_id */ |
|
status = -EKEYEXPIRED; |
|
break; |
|
default: |
|
pr_warn("NFS: %s unhandled error %d. Exiting with error EIO\n", |
|
__func__, status); |
|
status = -EIO; |
|
} |
|
|
|
out_unlock: |
|
mutex_unlock(&nfs_clid_init_mutex); |
|
dprintk("NFS: %s: status = %d\n", __func__, status); |
|
return status; |
|
} |
|
|
|
#ifdef CONFIG_NFS_V4_1 |
|
void nfs4_schedule_session_recovery(struct nfs4_session *session, int err) |
|
{ |
|
struct nfs_client *clp = session->clp; |
|
|
|
switch (err) { |
|
default: |
|
set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); |
|
break; |
|
case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION: |
|
set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state); |
|
} |
|
nfs4_schedule_state_manager(clp); |
|
} |
|
EXPORT_SYMBOL_GPL(nfs4_schedule_session_recovery); |
|
|
|
void nfs41_notify_server(struct nfs_client *clp) |
|
{ |
|
/* Use CHECK_LEASE to ping the server with a SEQUENCE */ |
|
set_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state); |
|
nfs4_schedule_state_manager(clp); |
|
} |
|
|
|
static void nfs4_reset_all_state(struct nfs_client *clp) |
|
{ |
|
if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) { |
|
set_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state); |
|
clear_bit(NFS4CLNT_LEASE_CONFIRM, &clp->cl_state); |
|
nfs4_state_start_reclaim_nograce(clp); |
|
dprintk("%s: scheduling reset of all state for server %s!\n", |
|
__func__, clp->cl_hostname); |
|
nfs4_schedule_state_manager(clp); |
|
} |
|
} |
|
|
|
static void nfs41_handle_server_reboot(struct nfs_client *clp) |
|
{ |
|
if (test_and_set_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0) { |
|
nfs4_state_start_reclaim_reboot(clp); |
|
dprintk("%s: server %s rebooted!\n", __func__, |
|
clp->cl_hostname); |
|
nfs4_schedule_state_manager(clp); |
|
} |
|
} |
|
|
|
static void nfs41_handle_all_state_revoked(struct nfs_client *clp) |
|
{ |
|
nfs4_reset_all_state(clp); |
|
dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname); |
|
} |
|
|
|
static void nfs41_handle_some_state_revoked(struct nfs_client *clp) |
|
{ |
|
nfs4_state_start_reclaim_nograce(clp); |
|
nfs4_schedule_state_manager(clp); |
|
|
|
dprintk("%s: state revoked on server %s\n", __func__, clp->cl_hostname); |
|
} |
|
|
|
static void nfs41_handle_recallable_state_revoked(struct nfs_client *clp) |
|
{ |
|
/* FIXME: For now, we destroy all layouts. */ |
|
pnfs_destroy_all_layouts(clp); |
|
nfs_test_expired_all_delegations(clp); |
|
dprintk("%s: Recallable state revoked on server %s!\n", __func__, |
|
clp->cl_hostname); |
|
} |
|
|
|
static void nfs41_handle_backchannel_fault(struct nfs_client *clp) |
|
{ |
|
set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); |
|
nfs4_schedule_state_manager(clp); |
|
|
|
dprintk("%s: server %s declared a backchannel fault\n", __func__, |
|
clp->cl_hostname); |
|
} |
|
|
|
static void nfs41_handle_cb_path_down(struct nfs_client *clp) |
|
{ |
|
if (test_and_set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, |
|
&clp->cl_state) == 0) |
|
nfs4_schedule_state_manager(clp); |
|
} |
|
|
|
void nfs41_handle_sequence_flag_errors(struct nfs_client *clp, u32 flags, |
|
bool recovery) |
|
{ |
|
if (!flags) |
|
return; |
|
|
|
dprintk("%s: \"%s\" (client ID %llx) flags=0x%08x\n", |
|
__func__, clp->cl_hostname, clp->cl_clientid, flags); |
|
/* |
|
* If we're called from the state manager thread, then assume we're |
|
* already handling the RECLAIM_NEEDED and/or STATE_REVOKED. |
|
* Those flags are expected to remain set until we're done |
|
* recovering (see RFC5661, section 18.46.3). |
|
*/ |
|
if (recovery) |
|
goto out_recovery; |
|
|
|
if (flags & SEQ4_STATUS_RESTART_RECLAIM_NEEDED) |
|
nfs41_handle_server_reboot(clp); |
|
if (flags & (SEQ4_STATUS_EXPIRED_ALL_STATE_REVOKED)) |
|
nfs41_handle_all_state_revoked(clp); |
|
if (flags & (SEQ4_STATUS_EXPIRED_SOME_STATE_REVOKED | |
|
SEQ4_STATUS_ADMIN_STATE_REVOKED)) |
|
nfs41_handle_some_state_revoked(clp); |
|
if (flags & SEQ4_STATUS_LEASE_MOVED) |
|
nfs4_schedule_lease_moved_recovery(clp); |
|
if (flags & SEQ4_STATUS_RECALLABLE_STATE_REVOKED) |
|
nfs41_handle_recallable_state_revoked(clp); |
|
out_recovery: |
|
if (flags & SEQ4_STATUS_BACKCHANNEL_FAULT) |
|
nfs41_handle_backchannel_fault(clp); |
|
else if (flags & (SEQ4_STATUS_CB_PATH_DOWN | |
|
SEQ4_STATUS_CB_PATH_DOWN_SESSION)) |
|
nfs41_handle_cb_path_down(clp); |
|
} |
|
|
|
static int nfs4_reset_session(struct nfs_client *clp) |
|
{ |
|
const struct cred *cred; |
|
int status; |
|
|
|
if (!nfs4_has_session(clp)) |
|
return 0; |
|
status = nfs4_begin_drain_session(clp); |
|
if (status != 0) |
|
return status; |
|
cred = nfs4_get_clid_cred(clp); |
|
status = nfs4_proc_destroy_session(clp->cl_session, cred); |
|
switch (status) { |
|
case 0: |
|
case -NFS4ERR_BADSESSION: |
|
case -NFS4ERR_DEADSESSION: |
|
break; |
|
case -NFS4ERR_BACK_CHAN_BUSY: |
|
case -NFS4ERR_DELAY: |
|
set_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state); |
|
status = 0; |
|
ssleep(1); |
|
goto out; |
|
default: |
|
status = nfs4_recovery_handle_error(clp, status); |
|
goto out; |
|
} |
|
|
|
memset(clp->cl_session->sess_id.data, 0, NFS4_MAX_SESSIONID_LEN); |
|
status = nfs4_proc_create_session(clp, cred); |
|
if (status) { |
|
dprintk("%s: session reset failed with status %d for server %s!\n", |
|
__func__, status, clp->cl_hostname); |
|
status = nfs4_handle_reclaim_lease_error(clp, status); |
|
goto out; |
|
} |
|
nfs41_finish_session_reset(clp); |
|
dprintk("%s: session reset was successful for server %s!\n", |
|
__func__, clp->cl_hostname); |
|
out: |
|
put_cred(cred); |
|
return status; |
|
} |
|
|
|
static int nfs4_bind_conn_to_session(struct nfs_client *clp) |
|
{ |
|
const struct cred *cred; |
|
int ret; |
|
|
|
if (!nfs4_has_session(clp)) |
|
return 0; |
|
ret = nfs4_begin_drain_session(clp); |
|
if (ret != 0) |
|
return ret; |
|
cred = nfs4_get_clid_cred(clp); |
|
ret = nfs4_proc_bind_conn_to_session(clp, cred); |
|
put_cred(cred); |
|
clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state); |
|
switch (ret) { |
|
case 0: |
|
dprintk("%s: bind_conn_to_session was successful for server %s!\n", |
|
__func__, clp->cl_hostname); |
|
break; |
|
case -NFS4ERR_DELAY: |
|
ssleep(1); |
|
set_bit(NFS4CLNT_BIND_CONN_TO_SESSION, &clp->cl_state); |
|
break; |
|
default: |
|
return nfs4_recovery_handle_error(clp, ret); |
|
} |
|
return 0; |
|
} |
|
|
|
static void nfs4_layoutreturn_any_run(struct nfs_client *clp) |
|
{ |
|
int iomode = 0; |
|
|
|
if (test_and_clear_bit(NFS4CLNT_RECALL_ANY_LAYOUT_READ, &clp->cl_state)) |
|
iomode += IOMODE_READ; |
|
if (test_and_clear_bit(NFS4CLNT_RECALL_ANY_LAYOUT_RW, &clp->cl_state)) |
|
iomode += IOMODE_RW; |
|
/* Note: IOMODE_READ + IOMODE_RW == IOMODE_ANY */ |
|
if (iomode) { |
|
pnfs_layout_return_unused_byclid(clp, iomode); |
|
set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state); |
|
} |
|
} |
|
#else /* CONFIG_NFS_V4_1 */ |
|
static int nfs4_reset_session(struct nfs_client *clp) { return 0; } |
|
|
|
static int nfs4_bind_conn_to_session(struct nfs_client *clp) |
|
{ |
|
return 0; |
|
} |
|
|
|
static void nfs4_layoutreturn_any_run(struct nfs_client *clp) |
|
{ |
|
} |
|
#endif /* CONFIG_NFS_V4_1 */ |
|
|
|
static void nfs4_state_manager(struct nfs_client *clp) |
|
{ |
|
int status = 0; |
|
const char *section = "", *section_sep = ""; |
|
|
|
/* Ensure exclusive access to NFSv4 state */ |
|
do { |
|
trace_nfs4_state_mgr(clp); |
|
clear_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state); |
|
if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) { |
|
section = "purge state"; |
|
status = nfs4_purge_lease(clp); |
|
if (status < 0) |
|
goto out_error; |
|
continue; |
|
} |
|
|
|
if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) { |
|
section = "lease expired"; |
|
/* We're going to have to re-establish a clientid */ |
|
status = nfs4_reclaim_lease(clp); |
|
if (status < 0) |
|
goto out_error; |
|
continue; |
|
} |
|
|
|
/* Initialize or reset the session */ |
|
if (test_and_clear_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state)) { |
|
section = "reset session"; |
|
status = nfs4_reset_session(clp); |
|
if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state)) |
|
continue; |
|
if (status < 0) |
|
goto out_error; |
|
} |
|
|
|
/* Send BIND_CONN_TO_SESSION */ |
|
if (test_and_clear_bit(NFS4CLNT_BIND_CONN_TO_SESSION, |
|
&clp->cl_state)) { |
|
section = "bind conn to session"; |
|
status = nfs4_bind_conn_to_session(clp); |
|
if (status < 0) |
|
goto out_error; |
|
continue; |
|
} |
|
|
|
if (test_and_clear_bit(NFS4CLNT_CHECK_LEASE, &clp->cl_state)) { |
|
section = "check lease"; |
|
status = nfs4_check_lease(clp); |
|
if (status < 0) |
|
goto out_error; |
|
continue; |
|
} |
|
|
|
if (test_and_clear_bit(NFS4CLNT_MOVED, &clp->cl_state)) { |
|
section = "migration"; |
|
status = nfs4_handle_migration(clp); |
|
if (status < 0) |
|
goto out_error; |
|
} |
|
|
|
if (test_and_clear_bit(NFS4CLNT_LEASE_MOVED, &clp->cl_state)) { |
|
section = "lease moved"; |
|
status = nfs4_handle_lease_moved(clp); |
|
if (status < 0) |
|
goto out_error; |
|
} |
|
|
|
/* First recover reboot state... */ |
|
if (test_bit(NFS4CLNT_RECLAIM_REBOOT, &clp->cl_state)) { |
|
section = "reclaim reboot"; |
|
status = nfs4_do_reclaim(clp, |
|
clp->cl_mvops->reboot_recovery_ops); |
|
if (status == -EAGAIN) |
|
continue; |
|
if (status < 0) |
|
goto out_error; |
|
nfs4_state_end_reclaim_reboot(clp); |
|
} |
|
|
|
/* Detect expired delegations... */ |
|
if (test_and_clear_bit(NFS4CLNT_DELEGATION_EXPIRED, &clp->cl_state)) { |
|
section = "detect expired delegations"; |
|
nfs_reap_expired_delegations(clp); |
|
continue; |
|
} |
|
|
|
/* Now recover expired state... */ |
|
if (test_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state)) { |
|
section = "reclaim nograce"; |
|
status = nfs4_do_reclaim(clp, |
|
clp->cl_mvops->nograce_recovery_ops); |
|
if (status == -EAGAIN) |
|
continue; |
|
if (status < 0) |
|
goto out_error; |
|
clear_bit(NFS4CLNT_RECLAIM_NOGRACE, &clp->cl_state); |
|
} |
|
|
|
nfs4_end_drain_session(clp); |
|
nfs4_clear_state_manager_bit(clp); |
|
|
|
if (!test_and_set_bit(NFS4CLNT_RECALL_RUNNING, &clp->cl_state)) { |
|
if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) { |
|
nfs_client_return_marked_delegations(clp); |
|
set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state); |
|
} |
|
nfs4_layoutreturn_any_run(clp); |
|
clear_bit(NFS4CLNT_RECALL_RUNNING, &clp->cl_state); |
|
} |
|
|
|
/* Did we race with an attempt to give us more work? */ |
|
if (!test_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state)) |
|
return; |
|
if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0) |
|
return; |
|
} while (refcount_read(&clp->cl_count) > 1 && !signalled()); |
|
goto out_drain; |
|
|
|
out_error: |
|
if (strlen(section)) |
|
section_sep = ": "; |
|
trace_nfs4_state_mgr_failed(clp, section, status); |
|
pr_warn_ratelimited("NFS: state manager%s%s failed on NFSv4 server %s" |
|
" with error %d\n", section_sep, section, |
|
clp->cl_hostname, -status); |
|
ssleep(1); |
|
out_drain: |
|
nfs4_end_drain_session(clp); |
|
nfs4_clear_state_manager_bit(clp); |
|
} |
|
|
|
static int nfs4_run_state_manager(void *ptr) |
|
{ |
|
struct nfs_client *clp = ptr; |
|
|
|
allow_signal(SIGKILL); |
|
nfs4_state_manager(clp); |
|
nfs_put_client(clp); |
|
module_put_and_exit(0); |
|
return 0; |
|
} |
|
|
|
/* |
|
* Local variables: |
|
* c-basic-offset: 8 |
|
* End: |
|
*/
|
|
|