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linux/fs/nfsd/nfs4state.c
J. Bruce Fields af558e33be nfsd: common grace period control 
Rewrite grace period code to unify management of grace period across
lockd and nfsd.  The current code has lockd and nfsd cooperate to
compute a grace period which is satisfactory to them both, and then
individually enforce it.  This creates a slight race condition, since
the enforcement is not coordinated.  It's also more complicated than
necessary.

Here instead we have lockd and nfsd each inform common code when they
enter the grace period, and when they're ready to leave the grace
period, and allow normal locking only after both of them are ready to
leave.

We also expect the locks_start_grace()/locks_end_grace() interface here
to be simpler to build on for future cluster/high-availability work,
which may require (for example) putting individual filesystems into
grace, or enforcing grace periods across multiple cluster nodes.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
2008-10-03 16:19:02 -04:00

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/*
* linux/fs/nfsd/nfs4state.c
*
* Copyright (c) 2001 The Regents of the University of Michigan.
* All rights reserved.
*
* Kendrick Smith <kmsmith@umich.edu>
* Andy Adamson <kandros@umich.edu>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <linux/param.h>
#include <linux/major.h>
#include <linux/slab.h>
#include <linux/sunrpc/svc.h>
#include <linux/nfsd/nfsd.h>
#include <linux/nfsd/cache.h>
#include <linux/file.h>
#include <linux/mount.h>
#include <linux/workqueue.h>
#include <linux/smp_lock.h>
#include <linux/kthread.h>
#include <linux/nfs4.h>
#include <linux/nfsd/state.h>
#include <linux/nfsd/xdr4.h>
#include <linux/namei.h>
#include <linux/swap.h>
#include <linux/mutex.h>
#include <linux/lockd/bind.h>
#include <linux/module.h>
#define NFSDDBG_FACILITY NFSDDBG_PROC
/* Globals */
static time_t lease_time = 90; /* default lease time */
static time_t user_lease_time = 90;
static time_t boot_time;
static u32 current_ownerid = 1;
static u32 current_fileid = 1;
static u32 current_delegid = 1;
static u32 nfs4_init;
static stateid_t zerostateid; /* bits all 0 */
static stateid_t onestateid; /* bits all 1 */
#define ZERO_STATEID(stateid) (!memcmp((stateid), &zerostateid, sizeof(stateid_t)))
#define ONE_STATEID(stateid) (!memcmp((stateid), &onestateid, sizeof(stateid_t)))
/* forward declarations */
static struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);
static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid);
static void release_stateid_lockowners(struct nfs4_stateid *open_stp);
static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
static void nfs4_set_recdir(char *recdir);
/* Locking:
*
* client_mutex:
* protects clientid_hashtbl[], clientstr_hashtbl[],
* unconfstr_hashtbl[], uncofid_hashtbl[].
*/
static DEFINE_MUTEX(client_mutex);
static struct kmem_cache *stateowner_slab = NULL;
static struct kmem_cache *file_slab = NULL;
static struct kmem_cache *stateid_slab = NULL;
static struct kmem_cache *deleg_slab = NULL;
void
nfs4_lock_state(void)
{
mutex_lock(&client_mutex);
}
void
nfs4_unlock_state(void)
{
mutex_unlock(&client_mutex);
}
static inline u32
opaque_hashval(const void *ptr, int nbytes)
{
unsigned char *cptr = (unsigned char *) ptr;
u32 x = 0;
while (nbytes--) {
x *= 37;
x += *cptr++;
}
return x;
}
/* forward declarations */
static void release_stateowner(struct nfs4_stateowner *sop);
static void release_stateid(struct nfs4_stateid *stp, int flags);
/*
* Delegation state
*/
/* recall_lock protects the del_recall_lru */
static DEFINE_SPINLOCK(recall_lock);
static struct list_head del_recall_lru;
static void
free_nfs4_file(struct kref *kref)
{
struct nfs4_file *fp = container_of(kref, struct nfs4_file, fi_ref);
list_del(&fp->fi_hash);
iput(fp->fi_inode);
kmem_cache_free(file_slab, fp);
}
static inline void
put_nfs4_file(struct nfs4_file *fi)
{
kref_put(&fi->fi_ref, free_nfs4_file);
}
static inline void
get_nfs4_file(struct nfs4_file *fi)
{
kref_get(&fi->fi_ref);
}
static int num_delegations;
unsigned int max_delegations;
/*
* Open owner state (share locks)
*/
/* hash tables for nfs4_stateowner */
#define OWNER_HASH_BITS 8
#define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
#define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
#define ownerid_hashval(id) \
((id) & OWNER_HASH_MASK)
#define ownerstr_hashval(clientid, ownername) \
(((clientid) + opaque_hashval((ownername.data), (ownername.len))) & OWNER_HASH_MASK)
static struct list_head ownerid_hashtbl[OWNER_HASH_SIZE];
static struct list_head ownerstr_hashtbl[OWNER_HASH_SIZE];
/* hash table for nfs4_file */
#define FILE_HASH_BITS 8
#define FILE_HASH_SIZE (1 << FILE_HASH_BITS)
#define FILE_HASH_MASK (FILE_HASH_SIZE - 1)
/* hash table for (open)nfs4_stateid */
#define STATEID_HASH_BITS 10
#define STATEID_HASH_SIZE (1 << STATEID_HASH_BITS)
#define STATEID_HASH_MASK (STATEID_HASH_SIZE - 1)
#define file_hashval(x) \
hash_ptr(x, FILE_HASH_BITS)
#define stateid_hashval(owner_id, file_id) \
(((owner_id) + (file_id)) & STATEID_HASH_MASK)
static struct list_head file_hashtbl[FILE_HASH_SIZE];
static struct list_head stateid_hashtbl[STATEID_HASH_SIZE];
static struct nfs4_delegation *
alloc_init_deleg(struct nfs4_client *clp, struct nfs4_stateid *stp, struct svc_fh *current_fh, u32 type)
{
struct nfs4_delegation *dp;
struct nfs4_file *fp = stp->st_file;
struct nfs4_callback *cb = &stp->st_stateowner->so_client->cl_callback;
dprintk("NFSD alloc_init_deleg\n");
if (fp->fi_had_conflict)
return NULL;
if (num_delegations > max_delegations)
return NULL;
dp = kmem_cache_alloc(deleg_slab, GFP_KERNEL);
if (dp == NULL)
return dp;
num_delegations++;
INIT_LIST_HEAD(&dp->dl_perfile);
INIT_LIST_HEAD(&dp->dl_perclnt);
INIT_LIST_HEAD(&dp->dl_recall_lru);
dp->dl_client = clp;
get_nfs4_file(fp);
dp->dl_file = fp;
dp->dl_flock = NULL;
get_file(stp->st_vfs_file);
dp->dl_vfs_file = stp->st_vfs_file;
dp->dl_type = type;
dp->dl_recall.cbr_dp = NULL;
dp->dl_recall.cbr_ident = cb->cb_ident;
dp->dl_recall.cbr_trunc = 0;
dp->dl_stateid.si_boot = boot_time;
dp->dl_stateid.si_stateownerid = current_delegid++;
dp->dl_stateid.si_fileid = 0;
dp->dl_stateid.si_generation = 0;
dp->dl_fhlen = current_fh->fh_handle.fh_size;
memcpy(dp->dl_fhval, &current_fh->fh_handle.fh_base,
current_fh->fh_handle.fh_size);
dp->dl_time = 0;
atomic_set(&dp->dl_count, 1);
list_add(&dp->dl_perfile, &fp->fi_delegations);
list_add(&dp->dl_perclnt, &clp->cl_delegations);
return dp;
}
void
nfs4_put_delegation(struct nfs4_delegation *dp)
{
if (atomic_dec_and_test(&dp->dl_count)) {
dprintk("NFSD: freeing dp %p\n",dp);
put_nfs4_file(dp->dl_file);
kmem_cache_free(deleg_slab, dp);
num_delegations--;
}
}
/* Remove the associated file_lock first, then remove the delegation.
* lease_modify() is called to remove the FS_LEASE file_lock from
* the i_flock list, eventually calling nfsd's lock_manager
* fl_release_callback.
*/
static void
nfs4_close_delegation(struct nfs4_delegation *dp)
{
struct file *filp = dp->dl_vfs_file;
dprintk("NFSD: close_delegation dp %p\n",dp);
dp->dl_vfs_file = NULL;
/* The following nfsd_close may not actually close the file,
* but we want to remove the lease in any case. */
if (dp->dl_flock)
vfs_setlease(filp, F_UNLCK, &dp->dl_flock);
nfsd_close(filp);
}
/* Called under the state lock. */
static void
unhash_delegation(struct nfs4_delegation *dp)
{
list_del_init(&dp->dl_perfile);
list_del_init(&dp->dl_perclnt);
spin_lock(&recall_lock);
list_del_init(&dp->dl_recall_lru);
spin_unlock(&recall_lock);
nfs4_close_delegation(dp);
nfs4_put_delegation(dp);
}
/*
* SETCLIENTID state
*/
/* Hash tables for nfs4_clientid state */
#define CLIENT_HASH_BITS 4
#define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS)
#define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1)
#define clientid_hashval(id) \
((id) & CLIENT_HASH_MASK)
#define clientstr_hashval(name) \
(opaque_hashval((name), 8) & CLIENT_HASH_MASK)
/*
* reclaim_str_hashtbl[] holds known client info from previous reset/reboot
* used in reboot/reset lease grace period processing
*
* conf_id_hashtbl[], and conf_str_hashtbl[] hold confirmed
* setclientid_confirmed info.
*
* unconf_str_hastbl[] and unconf_id_hashtbl[] hold unconfirmed
* setclientid info.
*
* client_lru holds client queue ordered by nfs4_client.cl_time
* for lease renewal.
*
* close_lru holds (open) stateowner queue ordered by nfs4_stateowner.so_time
* for last close replay.
*/
static struct list_head reclaim_str_hashtbl[CLIENT_HASH_SIZE];
static int reclaim_str_hashtbl_size = 0;
static struct list_head conf_id_hashtbl[CLIENT_HASH_SIZE];
static struct list_head conf_str_hashtbl[CLIENT_HASH_SIZE];
static struct list_head unconf_str_hashtbl[CLIENT_HASH_SIZE];
static struct list_head unconf_id_hashtbl[CLIENT_HASH_SIZE];
static struct list_head client_lru;
static struct list_head close_lru;
static inline void
renew_client(struct nfs4_client *clp)
{
/*
* Move client to the end to the LRU list.
*/
dprintk("renewing client (clientid %08x/%08x)\n",
clp->cl_clientid.cl_boot,
clp->cl_clientid.cl_id);
list_move_tail(&clp->cl_lru, &client_lru);
clp->cl_time = get_seconds();
}
/* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
static int
STALE_CLIENTID(clientid_t *clid)
{
if (clid->cl_boot == boot_time)
return 0;
dprintk("NFSD stale clientid (%08x/%08x)\n",
clid->cl_boot, clid->cl_id);
return 1;
}
/*
* XXX Should we use a slab cache ?
* This type of memory management is somewhat inefficient, but we use it
* anyway since SETCLIENTID is not a common operation.
*/
static struct nfs4_client *alloc_client(struct xdr_netobj name)
{
struct nfs4_client *clp;
clp = kzalloc(sizeof(struct nfs4_client), GFP_KERNEL);
if (clp == NULL)
return NULL;
clp->cl_name.data = kmalloc(name.len, GFP_KERNEL);
if (clp->cl_name.data == NULL) {
kfree(clp);
return NULL;
}
memcpy(clp->cl_name.data, name.data, name.len);
clp->cl_name.len = name.len;
return clp;
}
static void
shutdown_callback_client(struct nfs4_client *clp)
{
struct rpc_clnt *clnt = clp->cl_callback.cb_client;
if (clnt) {
/*
* Callback threads take a reference on the client, so there
* should be no outstanding callbacks at this point.
*/
clp->cl_callback.cb_client = NULL;
rpc_shutdown_client(clnt);
}
}
static inline void
free_client(struct nfs4_client *clp)
{
shutdown_callback_client(clp);
if (clp->cl_cred.cr_group_info)
put_group_info(clp->cl_cred.cr_group_info);
kfree(clp->cl_name.data);
kfree(clp);
}
void
put_nfs4_client(struct nfs4_client *clp)
{
if (atomic_dec_and_test(&clp->cl_count))
free_client(clp);
}
static void
expire_client(struct nfs4_client *clp)
{
struct nfs4_stateowner *sop;
struct nfs4_delegation *dp;
struct list_head reaplist;
dprintk("NFSD: expire_client cl_count %d\n",
atomic_read(&clp->cl_count));
INIT_LIST_HEAD(&reaplist);
spin_lock(&recall_lock);
while (!list_empty(&clp->cl_delegations)) {
dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
dprintk("NFSD: expire client. dp %p, fp %p\n", dp,
dp->dl_flock);
list_del_init(&dp->dl_perclnt);
list_move(&dp->dl_recall_lru, &reaplist);
}
spin_unlock(&recall_lock);
while (!list_empty(&reaplist)) {
dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
list_del_init(&dp->dl_recall_lru);
unhash_delegation(dp);
}
list_del(&clp->cl_idhash);
list_del(&clp->cl_strhash);
list_del(&clp->cl_lru);
while (!list_empty(&clp->cl_openowners)) {
sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient);
release_stateowner(sop);
}
put_nfs4_client(clp);
}
static struct nfs4_client *create_client(struct xdr_netobj name, char *recdir)
{
struct nfs4_client *clp;
clp = alloc_client(name);
if (clp == NULL)
return NULL;
memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
atomic_set(&clp->cl_count, 1);
atomic_set(&clp->cl_callback.cb_set, 0);
INIT_LIST_HEAD(&clp->cl_idhash);
INIT_LIST_HEAD(&clp->cl_strhash);
INIT_LIST_HEAD(&clp->cl_openowners);
INIT_LIST_HEAD(&clp->cl_delegations);
INIT_LIST_HEAD(&clp->cl_lru);
return clp;
}
static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
{
memcpy(target->cl_verifier.data, source->data,
sizeof(target->cl_verifier.data));
}
static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
{
target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
target->cl_clientid.cl_id = source->cl_clientid.cl_id;
}
static void copy_cred(struct svc_cred *target, struct svc_cred *source)
{
target->cr_uid = source->cr_uid;
target->cr_gid = source->cr_gid;
target->cr_group_info = source->cr_group_info;
get_group_info(target->cr_group_info);
}
static int same_name(const char *n1, const char *n2)
{
return 0 == memcmp(n1, n2, HEXDIR_LEN);
}
static int
same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
{
return 0 == memcmp(v1->data, v2->data, sizeof(v1->data));
}
static int
same_clid(clientid_t *cl1, clientid_t *cl2)
{
return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
}
/* XXX what about NGROUP */
static int
same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
{
return cr1->cr_uid == cr2->cr_uid;
}
static void gen_clid(struct nfs4_client *clp)
{
static u32 current_clientid = 1;
clp->cl_clientid.cl_boot = boot_time;
clp->cl_clientid.cl_id = current_clientid++;
}
static void gen_confirm(struct nfs4_client *clp)
{
static u32 i;
u32 *p;
p = (u32 *)clp->cl_confirm.data;
*p++ = get_seconds();
*p++ = i++;
}
static int check_name(struct xdr_netobj name)
{
if (name.len == 0)
return 0;
if (name.len > NFS4_OPAQUE_LIMIT) {
dprintk("NFSD: check_name: name too long(%d)!\n", name.len);
return 0;
}
return 1;
}
static void
add_to_unconfirmed(struct nfs4_client *clp, unsigned int strhashval)
{
unsigned int idhashval;
list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
idhashval = clientid_hashval(clp->cl_clientid.cl_id);
list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
list_add_tail(&clp->cl_lru, &client_lru);
clp->cl_time = get_seconds();
}
static void
move_to_confirmed(struct nfs4_client *clp)
{
unsigned int idhashval = clientid_hashval(clp->cl_clientid.cl_id);
unsigned int strhashval;
dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
list_del_init(&clp->cl_strhash);
list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
strhashval = clientstr_hashval(clp->cl_recdir);
list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
renew_client(clp);
}
static struct nfs4_client *
find_confirmed_client(clientid_t *clid)
{
struct nfs4_client *clp;
unsigned int idhashval = clientid_hashval(clid->cl_id);
list_for_each_entry(clp, &conf_id_hashtbl[idhashval], cl_idhash) {
if (same_clid(&clp->cl_clientid, clid))
return clp;
}
return NULL;
}
static struct nfs4_client *
find_unconfirmed_client(clientid_t *clid)
{
struct nfs4_client *clp;
unsigned int idhashval = clientid_hashval(clid->cl_id);
list_for_each_entry(clp, &unconf_id_hashtbl[idhashval], cl_idhash) {
if (same_clid(&clp->cl_clientid, clid))
return clp;
}
return NULL;
}
static struct nfs4_client *
find_confirmed_client_by_str(const char *dname, unsigned int hashval)
{
struct nfs4_client *clp;
list_for_each_entry(clp, &conf_str_hashtbl[hashval], cl_strhash) {
if (same_name(clp->cl_recdir, dname))
return clp;
}
return NULL;
}
static struct nfs4_client *
find_unconfirmed_client_by_str(const char *dname, unsigned int hashval)
{
struct nfs4_client *clp;
list_for_each_entry(clp, &unconf_str_hashtbl[hashval], cl_strhash) {
if (same_name(clp->cl_recdir, dname))
return clp;
}
return NULL;
}
/* a helper function for parse_callback */
static int
parse_octet(unsigned int *lenp, char **addrp)
{
unsigned int len = *lenp;
char *p = *addrp;
int n = -1;
char c;
for (;;) {
if (!len)
break;
len--;
c = *p++;
if (c == '.')
break;
if ((c < '0') || (c > '9')) {
n = -1;
break;
}
if (n < 0)
n = 0;
n = (n * 10) + (c - '0');
if (n > 255) {
n = -1;
break;
}
}
*lenp = len;
*addrp = p;
return n;
}
/* parse and set the setclientid ipv4 callback address */
static int
parse_ipv4(unsigned int addr_len, char *addr_val, unsigned int *cbaddrp, unsigned short *cbportp)
{
int temp = 0;
u32 cbaddr = 0;
u16 cbport = 0;
u32 addrlen = addr_len;
char *addr = addr_val;
int i, shift;
/* ipaddress */
shift = 24;
for(i = 4; i > 0 ; i--) {
if ((temp = parse_octet(&addrlen, &addr)) < 0) {
return 0;
}
cbaddr |= (temp << shift);
if (shift > 0)
shift -= 8;
}
*cbaddrp = cbaddr;
/* port */
shift = 8;
for(i = 2; i > 0 ; i--) {
if ((temp = parse_octet(&addrlen, &addr)) < 0) {
return 0;
}
cbport |= (temp << shift);
if (shift > 0)
shift -= 8;
}
*cbportp = cbport;
return 1;
}
static void
gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se)
{
struct nfs4_callback *cb = &clp->cl_callback;
/* Currently, we only support tcp for the callback channel */
if ((se->se_callback_netid_len != 3) || memcmp((char *)se->se_callback_netid_val, "tcp", 3))
goto out_err;
if ( !(parse_ipv4(se->se_callback_addr_len, se->se_callback_addr_val,
&cb->cb_addr, &cb->cb_port)))
goto out_err;
cb->cb_prog = se->se_callback_prog;
cb->cb_ident = se->se_callback_ident;
return;
out_err:
dprintk(KERN_INFO "NFSD: this client (clientid %08x/%08x) "
"will not receive delegations\n",
clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
return;
}
__be32
nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
struct nfsd4_setclientid *setclid)
{
struct sockaddr_in *sin = svc_addr_in(rqstp);
struct xdr_netobj clname = {
.len = setclid->se_namelen,
.data = setclid->se_name,
};
nfs4_verifier clverifier = setclid->se_verf;
unsigned int strhashval;
struct nfs4_client *conf, *unconf, *new;
__be32 status;
char dname[HEXDIR_LEN];
if (!check_name(clname))
return nfserr_inval;
status = nfs4_make_rec_clidname(dname, &clname);
if (status)
return status;
/*
* XXX The Duplicate Request Cache (DRC) has been checked (??)
* We get here on a DRC miss.
*/
strhashval = clientstr_hashval(dname);
nfs4_lock_state();
conf = find_confirmed_client_by_str(dname, strhashval);
if (conf) {
/* RFC 3530 14.2.33 CASE 0: */
status = nfserr_clid_inuse;
if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)
|| conf->cl_addr != sin->sin_addr.s_addr) {
dprintk("NFSD: setclientid: string in use by client"
"at %u.%u.%u.%u\n", NIPQUAD(conf->cl_addr));
goto out;
}
}
/*
* section 14.2.33 of RFC 3530 (under the heading "IMPLEMENTATION")
* has a description of SETCLIENTID request processing consisting
* of 5 bullet points, labeled as CASE0 - CASE4 below.
*/
unconf = find_unconfirmed_client_by_str(dname, strhashval);
status = nfserr_resource;
if (!conf) {
/*
* RFC 3530 14.2.33 CASE 4:
* placed first, because it is the normal case
*/
if (unconf)
expire_client(unconf);
new = create_client(clname, dname);
if (new == NULL)
goto out;
gen_clid(new);
} else if (same_verf(&conf->cl_verifier, &clverifier)) {
/*
* RFC 3530 14.2.33 CASE 1:
* probable callback update
*/
if (unconf) {
/* Note this is removing unconfirmed {*x***},
* which is stronger than RFC recommended {vxc**}.
* This has the advantage that there is at most
* one {*x***} in either list at any time.
*/
expire_client(unconf);
}
new = create_client(clname, dname);
if (new == NULL)
goto out;
copy_clid(new, conf);
} else if (!unconf) {
/*
* RFC 3530 14.2.33 CASE 2:
* probable client reboot; state will be removed if
* confirmed.
*/
new = create_client(clname, dname);
if (new == NULL)
goto out;
gen_clid(new);
} else {
/*
* RFC 3530 14.2.33 CASE 3:
* probable client reboot; state will be removed if
* confirmed.
*/
expire_client(unconf);
new = create_client(clname, dname);
if (new == NULL)
goto out;
gen_clid(new);
}
copy_verf(new, &clverifier);
new->cl_addr = sin->sin_addr.s_addr;
copy_cred(&new->cl_cred, &rqstp->rq_cred);
gen_confirm(new);
gen_callback(new, setclid);
add_to_unconfirmed(new, strhashval);
setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
status = nfs_ok;
out:
nfs4_unlock_state();
return status;
}
/*
* Section 14.2.34 of RFC 3530 (under the heading "IMPLEMENTATION") has
* a description of SETCLIENTID_CONFIRM request processing consisting of 4
* bullets, labeled as CASE1 - CASE4 below.
*/
__be32
nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
struct nfsd4_compound_state *cstate,
struct nfsd4_setclientid_confirm *setclientid_confirm)
{
struct sockaddr_in *sin = svc_addr_in(rqstp);
struct nfs4_client *conf, *unconf;
nfs4_verifier confirm = setclientid_confirm->sc_confirm;
clientid_t * clid = &setclientid_confirm->sc_clientid;
__be32 status;
if (STALE_CLIENTID(clid))
return nfserr_stale_clientid;
/*
* XXX The Duplicate Request Cache (DRC) has been checked (??)
* We get here on a DRC miss.
*/
nfs4_lock_state();
conf = find_confirmed_client(clid);
unconf = find_unconfirmed_client(clid);
status = nfserr_clid_inuse;
if (conf && conf->cl_addr != sin->sin_addr.s_addr)
goto out;
if (unconf && unconf->cl_addr != sin->sin_addr.s_addr)
goto out;
/*
* section 14.2.34 of RFC 3530 has a description of
* SETCLIENTID_CONFIRM request processing consisting
* of 4 bullet points, labeled as CASE1 - CASE4 below.
*/
if (conf && unconf && same_verf(&confirm, &unconf->cl_confirm)) {
/*
* RFC 3530 14.2.34 CASE 1:
* callback update
*/
if (!same_creds(&conf->cl_cred, &unconf->cl_cred))
status = nfserr_clid_inuse;
else {
/* XXX: We just turn off callbacks until we can handle
* change request correctly. */
atomic_set(&conf->cl_callback.cb_set, 0);
gen_confirm(conf);
nfsd4_remove_clid_dir(unconf);
expire_client(unconf);
status = nfs_ok;
}
} else if (conf && !unconf) {
/*
* RFC 3530 14.2.34 CASE 2:
* probable retransmitted request; play it safe and
* do nothing.
*/
if (!same_creds(&conf->cl_cred, &rqstp->rq_cred))
status = nfserr_clid_inuse;
else
status = nfs_ok;
} else if (!conf && unconf
&& same_verf(&unconf->cl_confirm, &confirm)) {
/*
* RFC 3530 14.2.34 CASE 3:
* Normal case; new or rebooted client:
*/
if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred)) {
status = nfserr_clid_inuse;
} else {
unsigned int hash =
clientstr_hashval(unconf->cl_recdir);
conf = find_confirmed_client_by_str(unconf->cl_recdir,
hash);
if (conf) {
nfsd4_remove_clid_dir(conf);
expire_client(conf);
}
move_to_confirmed(unconf);
conf = unconf;
nfsd4_probe_callback(conf);
status = nfs_ok;
}
} else if ((!conf || (conf && !same_verf(&conf->cl_confirm, &confirm)))
&& (!unconf || (unconf && !same_verf(&unconf->cl_confirm,
&confirm)))) {
/*
* RFC 3530 14.2.34 CASE 4:
* Client probably hasn't noticed that we rebooted yet.
*/
status = nfserr_stale_clientid;
} else {
/* check that we have hit one of the cases...*/
status = nfserr_clid_inuse;
}
out:
nfs4_unlock_state();
return status;
}
/* OPEN Share state helper functions */
static inline struct nfs4_file *
alloc_init_file(struct inode *ino)
{
struct nfs4_file *fp;
unsigned int hashval = file_hashval(ino);
fp = kmem_cache_alloc(file_slab, GFP_KERNEL);
if (fp) {
kref_init(&fp->fi_ref);
INIT_LIST_HEAD(&fp->fi_hash);
INIT_LIST_HEAD(&fp->fi_stateids);
INIT_LIST_HEAD(&fp->fi_delegations);
list_add(&fp->fi_hash, &file_hashtbl[hashval]);
fp->fi_inode = igrab(ino);
fp->fi_id = current_fileid++;
fp->fi_had_conflict = false;
return fp;
}
return NULL;
}
static void
nfsd4_free_slab(struct kmem_cache **slab)
{
if (*slab == NULL)
return;
kmem_cache_destroy(*slab);
*slab = NULL;
}
void
nfsd4_free_slabs(void)
{
nfsd4_free_slab(&stateowner_slab);
nfsd4_free_slab(&file_slab);
nfsd4_free_slab(&stateid_slab);
nfsd4_free_slab(&deleg_slab);
}
static int
nfsd4_init_slabs(void)
{
stateowner_slab = kmem_cache_create("nfsd4_stateowners",
sizeof(struct nfs4_stateowner), 0, 0, NULL);
if (stateowner_slab == NULL)
goto out_nomem;
file_slab = kmem_cache_create("nfsd4_files",
sizeof(struct nfs4_file), 0, 0, NULL);
if (file_slab == NULL)
goto out_nomem;
stateid_slab = kmem_cache_create("nfsd4_stateids",
sizeof(struct nfs4_stateid), 0, 0, NULL);
if (stateid_slab == NULL)
goto out_nomem;
deleg_slab = kmem_cache_create("nfsd4_delegations",
sizeof(struct nfs4_delegation), 0, 0, NULL);
if (deleg_slab == NULL)
goto out_nomem;
return 0;
out_nomem:
nfsd4_free_slabs();
dprintk("nfsd4: out of memory while initializing nfsv4\n");
return -ENOMEM;
}
void
nfs4_free_stateowner(struct kref *kref)
{
struct nfs4_stateowner *sop =
container_of(kref, struct nfs4_stateowner, so_ref);
kfree(sop->so_owner.data);
kmem_cache_free(stateowner_slab, sop);
}
static inline struct nfs4_stateowner *
alloc_stateowner(struct xdr_netobj *owner)
{
struct nfs4_stateowner *sop;
if ((sop = kmem_cache_alloc(stateowner_slab, GFP_KERNEL))) {
if ((sop->so_owner.data = kmalloc(owner->len, GFP_KERNEL))) {
memcpy(sop->so_owner.data, owner->data, owner->len);
sop->so_owner.len = owner->len;
kref_init(&sop->so_ref);
return sop;
}
kmem_cache_free(stateowner_slab, sop);
}
return NULL;
}
static struct nfs4_stateowner *
alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
struct nfs4_stateowner *sop;
struct nfs4_replay *rp;
unsigned int idhashval;
if (!(sop = alloc_stateowner(&open->op_owner)))
return NULL;
idhashval = ownerid_hashval(current_ownerid);
INIT_LIST_HEAD(&sop->so_idhash);
INIT_LIST_HEAD(&sop->so_strhash);
INIT_LIST_HEAD(&sop->so_perclient);
INIT_LIST_HEAD(&sop->so_stateids);
INIT_LIST_HEAD(&sop->so_perstateid); /* not used */
INIT_LIST_HEAD(&sop->so_close_lru);
sop->so_time = 0;
list_add(&sop->so_idhash, &ownerid_hashtbl[idhashval]);
list_add(&sop->so_strhash, &ownerstr_hashtbl[strhashval]);
list_add(&sop->so_perclient, &clp->cl_openowners);
sop->so_is_open_owner = 1;
sop->so_id = current_ownerid++;
sop->so_client = clp;
sop->so_seqid = open->op_seqid;
sop->so_confirmed = 0;
rp = &sop->so_replay;
rp->rp_status = nfserr_serverfault;
rp->rp_buflen = 0;
rp->rp_buf = rp->rp_ibuf;
return sop;
}
static void
release_stateid_lockowners(struct nfs4_stateid *open_stp)
{
struct nfs4_stateowner *lock_sop;
while (!list_empty(&open_stp->st_lockowners)) {
lock_sop = list_entry(open_stp->st_lockowners.next,
struct nfs4_stateowner, so_perstateid);
/* list_del(&open_stp->st_lockowners); */
BUG_ON(lock_sop->so_is_open_owner);
release_stateowner(lock_sop);
}
}
static void
unhash_stateowner(struct nfs4_stateowner *sop)
{
struct nfs4_stateid *stp;
list_del(&sop->so_idhash);
list_del(&sop->so_strhash);
if (sop->so_is_open_owner)
list_del(&sop->so_perclient);
list_del(&sop->so_perstateid);
while (!list_empty(&sop->so_stateids)) {
stp = list_entry(sop->so_stateids.next,
struct nfs4_stateid, st_perstateowner);
if (sop->so_is_open_owner)
release_stateid(stp, OPEN_STATE);
else
release_stateid(stp, LOCK_STATE);
}
}
static void
release_stateowner(struct nfs4_stateowner *sop)
{
unhash_stateowner(sop);
list_del(&sop->so_close_lru);
nfs4_put_stateowner(sop);
}
static inline void
init_stateid(struct nfs4_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
struct nfs4_stateowner *sop = open->op_stateowner;
unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
INIT_LIST_HEAD(&stp->st_hash);
INIT_LIST_HEAD(&stp->st_perstateowner);
INIT_LIST_HEAD(&stp->st_lockowners);
INIT_LIST_HEAD(&stp->st_perfile);
list_add(&stp->st_hash, &stateid_hashtbl[hashval]);
list_add(&stp->st_perstateowner, &sop->so_stateids);
list_add(&stp->st_perfile, &fp->fi_stateids);
stp->st_stateowner = sop;
get_nfs4_file(fp);
stp->st_file = fp;
stp->st_stateid.si_boot = boot_time;
stp->st_stateid.si_stateownerid = sop->so_id;
stp->st_stateid.si_fileid = fp->fi_id;
stp->st_stateid.si_generation = 0;
stp->st_access_bmap = 0;
stp->st_deny_bmap = 0;
__set_bit(open->op_share_access, &stp->st_access_bmap);
__set_bit(open->op_share_deny, &stp->st_deny_bmap);
stp->st_openstp = NULL;
}
static void
release_stateid(struct nfs4_stateid *stp, int flags)
{
struct file *filp = stp->st_vfs_file;
list_del(&stp->st_hash);
list_del(&stp->st_perfile);
list_del(&stp->st_perstateowner);
if (flags & OPEN_STATE) {
release_stateid_lockowners(stp);
stp->st_vfs_file = NULL;
nfsd_close(filp);
} else if (flags & LOCK_STATE)
locks_remove_posix(filp, (fl_owner_t) stp->st_stateowner);
put_nfs4_file(stp->st_file);
kmem_cache_free(stateid_slab, stp);
}
static void
move_to_close_lru(struct nfs4_stateowner *sop)
{
dprintk("NFSD: move_to_close_lru nfs4_stateowner %p\n", sop);
list_move_tail(&sop->so_close_lru, &close_lru);
sop->so_time = get_seconds();
}
static int
same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner,
clientid_t *clid)
{
return (sop->so_owner.len == owner->len) &&
0 == memcmp(sop->so_owner.data, owner->data, owner->len) &&
(sop->so_client->cl_clientid.cl_id == clid->cl_id);
}
static struct nfs4_stateowner *
find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
{
struct nfs4_stateowner *so = NULL;
list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
if (same_owner_str(so, &open->op_owner, &open->op_clientid))
return so;
}
return NULL;
}
/* search file_hashtbl[] for file */
static struct nfs4_file *
find_file(struct inode *ino)
{
unsigned int hashval = file_hashval(ino);
struct nfs4_file *fp;
list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
if (fp->fi_inode == ino) {
get_nfs4_file(fp);
return fp;
}
}
return NULL;
}
static inline int access_valid(u32 x)
{
if (x < NFS4_SHARE_ACCESS_READ)
return 0;
if (x > NFS4_SHARE_ACCESS_BOTH)
return 0;
return 1;
}
static inline int deny_valid(u32 x)
{
/* Note: unlike access bits, deny bits may be zero. */
return x <= NFS4_SHARE_DENY_BOTH;
}
/*
* We store the NONE, READ, WRITE, and BOTH bits separately in the
* st_{access,deny}_bmap field of the stateid, in order to track not
* only what share bits are currently in force, but also what
* combinations of share bits previous opens have used. This allows us
* to enforce the recommendation of rfc 3530 14.2.19 that the server
* return an error if the client attempt to downgrade to a combination
* of share bits not explicable by closing some of its previous opens.
*
* XXX: This enforcement is actually incomplete, since we don't keep
* track of access/deny bit combinations; so, e.g., we allow:
*
* OPEN allow read, deny write
* OPEN allow both, deny none
* DOWNGRADE allow read, deny none
*
* which we should reject.
*/
static void
set_access(unsigned int *access, unsigned long bmap) {
int i;
*access = 0;
for (i = 1; i < 4; i++) {
if (test_bit(i, &bmap))
*access |= i;
}
}
static void
set_deny(unsigned int *deny, unsigned long bmap) {
int i;
*deny = 0;
for (i = 0; i < 4; i++) {
if (test_bit(i, &bmap))
*deny |= i ;
}
}
static int
test_share(struct nfs4_stateid *stp, struct nfsd4_open *open) {
unsigned int access, deny;
set_access(&access, stp->st_access_bmap);
set_deny(&deny, stp->st_deny_bmap);
if ((access & open->op_share_deny) || (deny & open->op_share_access))
return 0;
return 1;
}
/*
* Called to check deny when READ with all zero stateid or
* WRITE with all zero or all one stateid
*/
static __be32
nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
{
struct inode *ino = current_fh->fh_dentry->d_inode;
struct nfs4_file *fp;
struct nfs4_stateid *stp;
__be32 ret;
dprintk("NFSD: nfs4_share_conflict\n");
fp = find_file(ino);
if (!fp)
return nfs_ok;
ret = nfserr_locked;
/* Search for conflicting share reservations */
list_for_each_entry(stp, &fp->fi_stateids, st_perfile) {
if (test_bit(deny_type, &stp->st_deny_bmap) ||
test_bit(NFS4_SHARE_DENY_BOTH, &stp->st_deny_bmap))
goto out;
}
ret = nfs_ok;
out:
put_nfs4_file(fp);
return ret;
}
static inline void
nfs4_file_downgrade(struct file *filp, unsigned int share_access)
{
if (share_access & NFS4_SHARE_ACCESS_WRITE) {
drop_file_write_access(filp);
filp->f_mode = (filp->f_mode | FMODE_READ) & ~FMODE_WRITE;
}
}
/*
* Recall a delegation
*/
static int
do_recall(void *__dp)
{
struct nfs4_delegation *dp = __dp;
dp->dl_file->fi_had_conflict = true;
nfsd4_cb_recall(dp);
return 0;
}
/*
* Spawn a thread to perform a recall on the delegation represented
* by the lease (file_lock)
*
* Called from break_lease() with lock_kernel() held.
* Note: we assume break_lease will only call this *once* for any given
* lease.
*/
static
void nfsd_break_deleg_cb(struct file_lock *fl)
{
struct nfs4_delegation *dp= (struct nfs4_delegation *)fl->fl_owner;
struct task_struct *t;
dprintk("NFSD nfsd_break_deleg_cb: dp %p fl %p\n",dp,fl);
if (!dp)
return;
/* We're assuming the state code never drops its reference
* without first removing the lease. Since we're in this lease
* callback (and since the lease code is serialized by the kernel
* lock) we know the server hasn't removed the lease yet, we know
* it's safe to take a reference: */
atomic_inc(&dp->dl_count);
atomic_inc(&dp->dl_client->cl_count);
spin_lock(&recall_lock);
list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
spin_unlock(&recall_lock);
/* only place dl_time is set. protected by lock_kernel*/
dp->dl_time = get_seconds();
/*
* We don't want the locks code to timeout the lease for us;
* we'll remove it ourself if the delegation isn't returned
* in time.
*/
fl->fl_break_time = 0;
t = kthread_run(do_recall, dp, "%s", "nfs4_cb_recall");
if (IS_ERR(t)) {
struct nfs4_client *clp = dp->dl_client;
printk(KERN_INFO "NFSD: Callback thread failed for "
"for client (clientid %08x/%08x)\n",
clp->cl_clientid.cl_boot, clp->cl_clientid.cl_id);
put_nfs4_client(dp->dl_client);
nfs4_put_delegation(dp);
}
}
/*
* The file_lock is being reapd.
*
* Called by locks_free_lock() with lock_kernel() held.
*/
static
void nfsd_release_deleg_cb(struct file_lock *fl)
{
struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
dprintk("NFSD nfsd_release_deleg_cb: fl %p dp %p dl_count %d\n", fl,dp, atomic_read(&dp->dl_count));
if (!(fl->fl_flags & FL_LEASE) || !dp)
return;
dp->dl_flock = NULL;
}
/*
* Set the delegation file_lock back pointer.
*
* Called from setlease() with lock_kernel() held.
*/
static
void nfsd_copy_lock_deleg_cb(struct file_lock *new, struct file_lock *fl)
{
struct nfs4_delegation *dp = (struct nfs4_delegation *)new->fl_owner;
dprintk("NFSD: nfsd_copy_lock_deleg_cb: new fl %p dp %p\n", new, dp);
if (!dp)
return;
dp->dl_flock = new;
}
/*
* Called from setlease() with lock_kernel() held
*/
static
int nfsd_same_client_deleg_cb(struct file_lock *onlist, struct file_lock *try)
{
struct nfs4_delegation *onlistd =
(struct nfs4_delegation *)onlist->fl_owner;
struct nfs4_delegation *tryd =
(struct nfs4_delegation *)try->fl_owner;
if (onlist->fl_lmops != try->fl_lmops)
return 0;
return onlistd->dl_client == tryd->dl_client;
}
static
int nfsd_change_deleg_cb(struct file_lock **onlist, int arg)
{
if (arg & F_UNLCK)
return lease_modify(onlist, arg);
else
return -EAGAIN;
}
static struct lock_manager_operations nfsd_lease_mng_ops = {
.fl_break = nfsd_break_deleg_cb,
.fl_release_private = nfsd_release_deleg_cb,
.fl_copy_lock = nfsd_copy_lock_deleg_cb,
.fl_mylease = nfsd_same_client_deleg_cb,
.fl_change = nfsd_change_deleg_cb,
};
__be32
nfsd4_process_open1(struct nfsd4_open *open)
{
clientid_t *clientid = &open->op_clientid;
struct nfs4_client *clp = NULL;
unsigned int strhashval;
struct nfs4_stateowner *sop = NULL;
if (!check_name(open->op_owner))
return nfserr_inval;
if (STALE_CLIENTID(&open->op_clientid))
return nfserr_stale_clientid;
strhashval = ownerstr_hashval(clientid->cl_id, open->op_owner);
sop = find_openstateowner_str(strhashval, open);
open->op_stateowner = sop;
if (!sop) {
/* Make sure the client's lease hasn't expired. */
clp = find_confirmed_client(clientid);
if (clp == NULL)
return nfserr_expired;
goto renew;
}
if (!sop->so_confirmed) {
/* Replace unconfirmed owners without checking for replay. */
clp = sop->so_client;
release_stateowner(sop);
open->op_stateowner = NULL;
goto renew;
}
if (open->op_seqid == sop->so_seqid - 1) {
if (sop->so_replay.rp_buflen)
return nfserr_replay_me;
/* The original OPEN failed so spectacularly
* that we don't even have replay data saved!
* Therefore, we have no choice but to continue
* processing this OPEN; presumably, we'll
* fail again for the same reason.
*/
dprintk("nfsd4_process_open1: replay with no replay cache\n");
goto renew;
}
if (open->op_seqid != sop->so_seqid)
return nfserr_bad_seqid;
renew:
if (open->op_stateowner == NULL) {
sop = alloc_init_open_stateowner(strhashval, clp, open);
if (sop == NULL)
return nfserr_resource;
open->op_stateowner = sop;
}
list_del_init(&sop->so_close_lru);
renew_client(sop->so_client);
return nfs_ok;
}
static inline __be32
nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
{
if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
return nfserr_openmode;
else
return nfs_ok;
}
static struct nfs4_delegation *
find_delegation_file(struct nfs4_file *fp, stateid_t *stid)
{
struct nfs4_delegation *dp;
list_for_each_entry(dp, &fp->fi_delegations, dl_perfile) {
if (dp->dl_stateid.si_stateownerid == stid->si_stateownerid)
return dp;
}
return NULL;
}
static __be32
nfs4_check_deleg(struct nfs4_file *fp, struct nfsd4_open *open,
struct nfs4_delegation **dp)
{
int flags;
__be32 status = nfserr_bad_stateid;
*dp = find_delegation_file(fp, &open->op_delegate_stateid);
if (*dp == NULL)
goto out;
flags = open->op_share_access == NFS4_SHARE_ACCESS_READ ?
RD_STATE : WR_STATE;
status = nfs4_check_delegmode(*dp, flags);
if (status)
*dp = NULL;
out:
if (open->op_claim_type != NFS4_OPEN_CLAIM_DELEGATE_CUR)
return nfs_ok;
if (status)
return status;
open->op_stateowner->so_confirmed = 1;
return nfs_ok;
}
static __be32
nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_stateid **stpp)
{
struct nfs4_stateid *local;
__be32 status = nfserr_share_denied;
struct nfs4_stateowner *sop = open->op_stateowner;
list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
/* ignore lock owners */
if (local->st_stateowner->so_is_open_owner == 0)
continue;
/* remember if we have seen this open owner */
if (local->st_stateowner == sop)
*stpp = local;
/* check for conflicting share reservations */
if (!test_share(local, open))
goto out;
}
status = 0;
out:
return status;
}
static inline struct nfs4_stateid *
nfs4_alloc_stateid(void)
{
return kmem_cache_alloc(stateid_slab, GFP_KERNEL);
}
static __be32
nfs4_new_open(struct svc_rqst *rqstp, struct nfs4_stateid **stpp,
struct nfs4_delegation *dp,
struct svc_fh *cur_fh, int flags)
{
struct nfs4_stateid *stp;
stp = nfs4_alloc_stateid();
if (stp == NULL)
return nfserr_resource;
if (dp) {
get_file(dp->dl_vfs_file);
stp->st_vfs_file = dp->dl_vfs_file;
} else {
__be32 status;
status = nfsd_open(rqstp, cur_fh, S_IFREG, flags,
&stp->st_vfs_file);
if (status) {
if (status == nfserr_dropit)
status = nfserr_jukebox;
kmem_cache_free(stateid_slab, stp);
return status;
}
}
*stpp = stp;
return 0;
}
static inline __be32
nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
struct nfsd4_open *open)
{
struct iattr iattr = {
.ia_valid = ATTR_SIZE,
.ia_size = 0,
};
if (!open->op_truncate)
return 0;
if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
return nfserr_inval;
return nfsd_setattr(rqstp, fh, &iattr, 0, (time_t)0);
}
static __be32
nfs4_upgrade_open(struct svc_rqst *rqstp, struct svc_fh *cur_fh, struct nfs4_stateid *stp, struct nfsd4_open *open)
{
struct file *filp = stp->st_vfs_file;
struct inode *inode = filp->f_path.dentry->d_inode;
unsigned int share_access, new_writer;
__be32 status;
set_access(&share_access, stp->st_access_bmap);
new_writer = (~share_access) & open->op_share_access
& NFS4_SHARE_ACCESS_WRITE;
if (new_writer) {
int err = get_write_access(inode);
if (err)
return nfserrno(err);
err = mnt_want_write(cur_fh->fh_export->ex_path.mnt);
if (err)
return nfserrno(err);
file_take_write(filp);
}
status = nfsd4_truncate(rqstp, cur_fh, open);
if (status) {
if (new_writer)
put_write_access(inode);
return status;
}
/* remember the open */
filp->f_mode |= open->op_share_access;
__set_bit(open->op_share_access, &stp->st_access_bmap);
__set_bit(open->op_share_deny, &stp->st_deny_bmap);
return nfs_ok;
}
static void
nfs4_set_claim_prev(struct nfsd4_open *open)
{
open->op_stateowner->so_confirmed = 1;
open->op_stateowner->so_client->cl_firststate = 1;
}
/*
* Attempt to hand out a delegation.
*/
static void
nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_stateid *stp)
{
struct nfs4_delegation *dp;
struct nfs4_stateowner *sop = stp->st_stateowner;
struct nfs4_callback *cb = &sop->so_client->cl_callback;
struct file_lock fl, *flp = &fl;
int status, flag = 0;
flag = NFS4_OPEN_DELEGATE_NONE;
open->op_recall = 0;
switch (open->op_claim_type) {
case NFS4_OPEN_CLAIM_PREVIOUS:
if (!atomic_read(&cb->cb_set))
open->op_recall = 1;
flag = open->op_delegate_type;
if (flag == NFS4_OPEN_DELEGATE_NONE)
goto out;
break;
case NFS4_OPEN_CLAIM_NULL:
/* Let's not give out any delegations till everyone's
* had the chance to reclaim theirs.... */
if (locks_in_grace())
goto out;
if (!atomic_read(&cb->cb_set) || !sop->so_confirmed)
goto out;
if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
flag = NFS4_OPEN_DELEGATE_WRITE;
else
flag = NFS4_OPEN_DELEGATE_READ;
break;
default:
goto out;
}
dp = alloc_init_deleg(sop->so_client, stp, fh, flag);
if (dp == NULL) {
flag = NFS4_OPEN_DELEGATE_NONE;
goto out;
}
locks_init_lock(&fl);
fl.fl_lmops = &nfsd_lease_mng_ops;
fl.fl_flags = FL_LEASE;
fl.fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
fl.fl_end = OFFSET_MAX;
fl.fl_owner = (fl_owner_t)dp;
fl.fl_file = stp->st_vfs_file;
fl.fl_pid = current->tgid;
/* vfs_setlease checks to see if delegation should be handed out.
* the lock_manager callbacks fl_mylease and fl_change are used
*/
if ((status = vfs_setlease(stp->st_vfs_file, fl.fl_type, &flp))) {
dprintk("NFSD: setlease failed [%d], no delegation\n", status);
unhash_delegation(dp);
flag = NFS4_OPEN_DELEGATE_NONE;
goto out;
}
memcpy(&open->op_delegate_stateid, &dp->dl_stateid, sizeof(dp->dl_stateid));
dprintk("NFSD: delegation stateid=(%08x/%08x/%08x/%08x)\n\n",
dp->dl_stateid.si_boot,
dp->dl_stateid.si_stateownerid,
dp->dl_stateid.si_fileid,
dp->dl_stateid.si_generation);
out:
if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS
&& flag == NFS4_OPEN_DELEGATE_NONE
&& open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
dprintk("NFSD: WARNING: refusing delegation reclaim\n");
open->op_delegate_type = flag;
}
/*
* called with nfs4_lock_state() held.
*/
__be32
nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
{
struct nfs4_file *fp = NULL;
struct inode *ino = current_fh->fh_dentry->d_inode;
struct nfs4_stateid *stp = NULL;
struct nfs4_delegation *dp = NULL;
__be32 status;
status = nfserr_inval;
if (!access_valid(open->op_share_access)
|| !deny_valid(open->op_share_deny))
goto out;
/*
* Lookup file; if found, lookup stateid and check open request,
* and check for delegations in the process of being recalled.
* If not found, create the nfs4_file struct
*/
fp = find_file(ino);
if (fp) {
if ((status = nfs4_check_open(fp, open, &stp)))
goto out;
status = nfs4_check_deleg(fp, open, &dp);
if (status)
goto out;
} else {
status = nfserr_bad_stateid;
if (open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR)
goto out;
status = nfserr_resource;
fp = alloc_init_file(ino);
if (fp == NULL)
goto out;
}
/*
* OPEN the file, or upgrade an existing OPEN.
* If truncate fails, the OPEN fails.
*/
if (stp) {
/* Stateid was found, this is an OPEN upgrade */
status = nfs4_upgrade_open(rqstp, current_fh, stp, open);
if (status)
goto out;
update_stateid(&stp->st_stateid);
} else {
/* Stateid was not found, this is a new OPEN */
int flags = 0;
if (open->op_share_access & NFS4_SHARE_ACCESS_READ)
flags |= NFSD_MAY_READ;
if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE)
flags |= NFSD_MAY_WRITE;
status = nfs4_new_open(rqstp, &stp, dp, current_fh, flags);
if (status)
goto out;
init_stateid(stp, fp, open);
status = nfsd4_truncate(rqstp, current_fh, open);
if (status) {
release_stateid(stp, OPEN_STATE);
goto out;
}
}
memcpy(&open->op_stateid, &stp->st_stateid, sizeof(stateid_t));
/*
* Attempt to hand out a delegation. No error return, because the
* OPEN succeeds even if we fail.
*/
nfs4_open_delegation(current_fh, open, stp);
status = nfs_ok;
dprintk("nfs4_process_open2: stateid=(%08x/%08x/%08x/%08x)\n",
stp->st_stateid.si_boot, stp->st_stateid.si_stateownerid,
stp->st_stateid.si_fileid, stp->st_stateid.si_generation);
out:
if (fp)
put_nfs4_file(fp);
if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
nfs4_set_claim_prev(open);
/*
* To finish the open response, we just need to set the rflags.
*/
open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
if (!open->op_stateowner->so_confirmed)
open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
return status;
}
__be32
nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
clientid_t *clid)
{
struct nfs4_client *clp;
__be32 status;
nfs4_lock_state();
dprintk("process_renew(%08x/%08x): starting\n",
clid->cl_boot, clid->cl_id);
status = nfserr_stale_clientid;
if (STALE_CLIENTID(clid))
goto out;
clp = find_confirmed_client(clid);
status = nfserr_expired;
if (clp == NULL) {
/* We assume the client took too long to RENEW. */
dprintk("nfsd4_renew: clientid not found!\n");
goto out;
}
renew_client(clp);
status = nfserr_cb_path_down;
if (!list_empty(&clp->cl_delegations)
&& !atomic_read(&clp->cl_callback.cb_set))
goto out;
status = nfs_ok;
out:
nfs4_unlock_state();
return status;
}
struct lock_manager nfsd4_manager = {
};
static void
nfsd4_end_grace(void)
{
dprintk("NFSD: end of grace period\n");
nfsd4_recdir_purge_old();
locks_end_grace(&nfsd4_manager);
}
static time_t
nfs4_laundromat(void)
{
struct nfs4_client *clp;
struct nfs4_stateowner *sop;
struct nfs4_delegation *dp;
struct list_head *pos, *next, reaplist;
time_t cutoff = get_seconds() - NFSD_LEASE_TIME;
time_t t, clientid_val = NFSD_LEASE_TIME;
time_t u, test_val = NFSD_LEASE_TIME;
nfs4_lock_state();
dprintk("NFSD: laundromat service - starting\n");
if (locks_in_grace())
nfsd4_end_grace();
list_for_each_safe(pos, next, &client_lru) {
clp = list_entry(pos, struct nfs4_client, cl_lru);
if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
t = clp->cl_time - cutoff;
if (clientid_val > t)
clientid_val = t;
break;
}
dprintk("NFSD: purging unused client (clientid %08x)\n",
clp->cl_clientid.cl_id);
nfsd4_remove_clid_dir(clp);
expire_client(clp);
}
INIT_LIST_HEAD(&reaplist);
spin_lock(&recall_lock);
list_for_each_safe(pos, next, &del_recall_lru) {
dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
if (time_after((unsigned long)dp->dl_time, (unsigned long)cutoff)) {
u = dp->dl_time - cutoff;
if (test_val > u)
test_val = u;
break;
}
dprintk("NFSD: purging unused delegation dp %p, fp %p\n",
dp, dp->dl_flock);
list_move(&dp->dl_recall_lru, &reaplist);
}
spin_unlock(&recall_lock);
list_for_each_safe(pos, next, &reaplist) {
dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
list_del_init(&dp->dl_recall_lru);
unhash_delegation(dp);
}
test_val = NFSD_LEASE_TIME;
list_for_each_safe(pos, next, &close_lru) {
sop = list_entry(pos, struct nfs4_stateowner, so_close_lru);
if (time_after((unsigned long)sop->so_time, (unsigned long)cutoff)) {
u = sop->so_time - cutoff;
if (test_val > u)
test_val = u;
break;
}
dprintk("NFSD: purging unused open stateowner (so_id %d)\n",
sop->so_id);
release_stateowner(sop);
}
if (clientid_val < NFSD_LAUNDROMAT_MINTIMEOUT)
clientid_val = NFSD_LAUNDROMAT_MINTIMEOUT;
nfs4_unlock_state();
return clientid_val;
}
static struct workqueue_struct *laundry_wq;
static void laundromat_main(struct work_struct *);
static DECLARE_DELAYED_WORK(laundromat_work, laundromat_main);
static void
laundromat_main(struct work_struct *not_used)
{
time_t t;
t = nfs4_laundromat();
dprintk("NFSD: laundromat_main - sleeping for %ld seconds\n", t);
queue_delayed_work(laundry_wq, &laundromat_work, t*HZ);
}
static struct nfs4_stateowner *
search_close_lru(u32 st_id, int flags)
{
struct nfs4_stateowner *local = NULL;
if (flags & CLOSE_STATE) {
list_for_each_entry(local, &close_lru, so_close_lru) {
if (local->so_id == st_id)
return local;
}
}
return NULL;
}
static inline int
nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stateid *stp)
{
return fhp->fh_dentry->d_inode != stp->st_vfs_file->f_path.dentry->d_inode;
}
static int
STALE_STATEID(stateid_t *stateid)
{
if (stateid->si_boot == boot_time)
return 0;
dprintk("NFSD: stale stateid (%08x/%08x/%08x/%08x)!\n",
stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
stateid->si_generation);
return 1;
}
static inline int
access_permit_read(unsigned long access_bmap)
{
return test_bit(NFS4_SHARE_ACCESS_READ, &access_bmap) ||
test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap) ||
test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap);
}
static inline int
access_permit_write(unsigned long access_bmap)
{
return test_bit(NFS4_SHARE_ACCESS_WRITE, &access_bmap) ||
test_bit(NFS4_SHARE_ACCESS_BOTH, &access_bmap);
}
static
__be32 nfs4_check_openmode(struct nfs4_stateid *stp, int flags)
{
__be32 status = nfserr_openmode;
if ((flags & WR_STATE) && (!access_permit_write(stp->st_access_bmap)))
goto out;
if ((flags & RD_STATE) && (!access_permit_read(stp->st_access_bmap)))
goto out;
status = nfs_ok;
out:
return status;
}
static inline __be32
check_special_stateids(svc_fh *current_fh, stateid_t *stateid, int flags)
{
/* Trying to call delegreturn with a special stateid? Yuch: */
if (!(flags & (RD_STATE | WR_STATE)))
return nfserr_bad_stateid;
else if (ONE_STATEID(stateid) && (flags & RD_STATE))
return nfs_ok;
else if (locks_in_grace()) {
/* Answer in remaining cases depends on existance of
* conflicting state; so we must wait out the grace period. */
return nfserr_grace;
} else if (flags & WR_STATE)
return nfs4_share_conflict(current_fh,
NFS4_SHARE_DENY_WRITE);
else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
return nfs4_share_conflict(current_fh,
NFS4_SHARE_DENY_READ);
}
/*
* Allow READ/WRITE during grace period on recovered state only for files
* that are not able to provide mandatory locking.
*/
static inline int
io_during_grace_disallowed(struct inode *inode, int flags)
{
return locks_in_grace() && (flags & (RD_STATE | WR_STATE))
&& mandatory_lock(inode);
}
static int check_stateid_generation(stateid_t *in, stateid_t *ref)
{
/* If the client sends us a stateid from the future, it's buggy: */
if (in->si_generation > ref->si_generation)
return nfserr_bad_stateid;
/*
* The following, however, can happen. For example, if the
* client sends an open and some IO at the same time, the open
* may bump si_generation while the IO is still in flight.
* Thanks to hard links and renames, the client never knows what
* file an open will affect. So it could avoid that situation
* only by serializing all opens and IO from the same open
* owner. To recover from the old_stateid error, the client
* will just have to retry the IO:
*/
if (in->si_generation < ref->si_generation)
return nfserr_old_stateid;
return nfs_ok;
}
/*
* Checks for stateid operations
*/
__be32
nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int flags, struct file **filpp)
{
struct nfs4_stateid *stp = NULL;
struct nfs4_delegation *dp = NULL;
stateid_t *stidp;
struct inode *ino = current_fh->fh_dentry->d_inode;
__be32 status;
dprintk("NFSD: preprocess_stateid_op: stateid = (%08x/%08x/%08x/%08x)\n",
stateid->si_boot, stateid->si_stateownerid,
stateid->si_fileid, stateid->si_generation);
if (filpp)
*filpp = NULL;
if (io_during_grace_disallowed(ino, flags))
return nfserr_grace;
if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
return check_special_stateids(current_fh, stateid, flags);
/* STALE STATEID */
status = nfserr_stale_stateid;
if (STALE_STATEID(stateid))
goto out;
/* BAD STATEID */
status = nfserr_bad_stateid;
if (!stateid->si_fileid) { /* delegation stateid */
if(!(dp = find_delegation_stateid(ino, stateid))) {
dprintk("NFSD: delegation stateid not found\n");
goto out;
}
stidp = &dp->dl_stateid;
} else { /* open or lock stateid */
if (!(stp = find_stateid(stateid, flags))) {
dprintk("NFSD: open or lock stateid not found\n");
goto out;
}
if ((flags & CHECK_FH) && nfs4_check_fh(current_fh, stp))
goto out;
if (!stp->st_stateowner->so_confirmed)
goto out;
stidp = &stp->st_stateid;
}
status = check_stateid_generation(stateid, stidp);
if (status)
goto out;
if (stp) {
if ((status = nfs4_check_openmode(stp,flags)))
goto out;
renew_client(stp->st_stateowner->so_client);
if (filpp)
*filpp = stp->st_vfs_file;
} else {
if ((status = nfs4_check_delegmode(dp, flags)))
goto out;
renew_client(dp->dl_client);
if (flags & DELEG_RET)
unhash_delegation(dp);
if (filpp)
*filpp = dp->dl_vfs_file;
}
status = nfs_ok;
out:
return status;
}
static inline int
setlkflg (int type)
{
return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
RD_STATE : WR_STATE;
}
/*
* Checks for sequence id mutating operations.
*/
static __be32
nfs4_preprocess_seqid_op(struct svc_fh *current_fh, u32 seqid, stateid_t *stateid, int flags, struct nfs4_stateowner **sopp, struct nfs4_stateid **stpp, struct nfsd4_lock *lock)
{
struct nfs4_stateid *stp;
struct nfs4_stateowner *sop;
__be32 status;
dprintk("NFSD: preprocess_seqid_op: seqid=%d "
"stateid = (%08x/%08x/%08x/%08x)\n", seqid,
stateid->si_boot, stateid->si_stateownerid, stateid->si_fileid,
stateid->si_generation);
*stpp = NULL;
*sopp = NULL;
if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
dprintk("NFSD: preprocess_seqid_op: magic stateid!\n");
return nfserr_bad_stateid;
}
if (STALE_STATEID(stateid))
return nfserr_stale_stateid;
/*
* We return BAD_STATEID if filehandle doesn't match stateid,
* the confirmed flag is incorrecly set, or the generation
* number is incorrect.
*/
stp = find_stateid(stateid, flags);
if (stp == NULL) {
/*
* Also, we should make sure this isn't just the result of
* a replayed close:
*/
sop = search_close_lru(stateid->si_stateownerid, flags);
if (sop == NULL)
return nfserr_bad_stateid;
*sopp = sop;
goto check_replay;
}
*stpp = stp;
*sopp = sop = stp->st_stateowner;
if (lock) {
clientid_t *lockclid = &lock->v.new.clientid;
struct nfs4_client *clp = sop->so_client;
int lkflg = 0;
__be32 status;
lkflg = setlkflg(lock->lk_type);
if (lock->lk_is_new) {
if (!sop->so_is_open_owner)
return nfserr_bad_stateid;
if (!same_clid(&clp->cl_clientid, lockclid))
return nfserr_bad_stateid;
/* stp is the open stateid */
status = nfs4_check_openmode(stp, lkflg);
if (status)
return status;
} else {
/* stp is the lock stateid */
status = nfs4_check_openmode(stp->st_openstp, lkflg);
if (status)
return status;
}
}
if (nfs4_check_fh(current_fh, stp)) {
dprintk("NFSD: preprocess_seqid_op: fh-stateid mismatch!\n");
return nfserr_bad_stateid;
}
/*
* We now validate the seqid and stateid generation numbers.
* For the moment, we ignore the possibility of
* generation number wraparound.
*/
if (seqid != sop->so_seqid)
goto check_replay;
if (sop->so_confirmed && flags & CONFIRM) {
dprintk("NFSD: preprocess_seqid_op: expected"
" unconfirmed stateowner!\n");
return nfserr_bad_stateid;
}
if (!sop->so_confirmed && !(flags & CONFIRM)) {
dprintk("NFSD: preprocess_seqid_op: stateowner not"
" confirmed yet!\n");
return nfserr_bad_stateid;
}
status = check_stateid_generation(stateid, &stp->st_stateid);
if (status)
return status;
renew_client(sop->so_client);
return nfs_ok;
check_replay:
if (seqid == sop->so_seqid - 1) {
dprintk("NFSD: preprocess_seqid_op: retransmission?\n");
/* indicate replay to calling function */
return nfserr_replay_me;
}
dprintk("NFSD: preprocess_seqid_op: bad seqid (expected %d, got %d)\n",
sop->so_seqid, seqid);
*sopp = NULL;
return nfserr_bad_seqid;
}
__be32
nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
struct nfsd4_open_confirm *oc)
{
__be32 status;
struct nfs4_stateowner *sop;
struct nfs4_stateid *stp;
dprintk("NFSD: nfsd4_open_confirm on file %.*s\n",
(int)cstate->current_fh.fh_dentry->d_name.len,
cstate->current_fh.fh_dentry->d_name.name);
status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
if (status)
return status;
nfs4_lock_state();
if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
oc->oc_seqid, &oc->oc_req_stateid,
CONFIRM | OPEN_STATE,
&oc->oc_stateowner, &stp, NULL)))
goto out;
sop = oc->oc_stateowner;
sop->so_confirmed = 1;
update_stateid(&stp->st_stateid);
memcpy(&oc->oc_resp_stateid, &stp->st_stateid, sizeof(stateid_t));
dprintk("NFSD: nfsd4_open_confirm: success, seqid=%d "
"stateid=(%08x/%08x/%08x/%08x)\n", oc->oc_seqid,
stp->st_stateid.si_boot,
stp->st_stateid.si_stateownerid,
stp->st_stateid.si_fileid,
stp->st_stateid.si_generation);
nfsd4_create_clid_dir(sop->so_client);
out:
if (oc->oc_stateowner) {
nfs4_get_stateowner(oc->oc_stateowner);
cstate->replay_owner = oc->oc_stateowner;
}
nfs4_unlock_state();
return status;
}
/*
* unset all bits in union bitmap (bmap) that
* do not exist in share (from successful OPEN_DOWNGRADE)
*/
static void
reset_union_bmap_access(unsigned long access, unsigned long *bmap)
{
int i;
for (i = 1; i < 4; i++) {
if ((i & access) != i)
__clear_bit(i, bmap);
}
}
static void
reset_union_bmap_deny(unsigned long deny, unsigned long *bmap)
{
int i;
for (i = 0; i < 4; i++) {
if ((i & deny) != i)
__clear_bit(i, bmap);
}
}
__be32
nfsd4_open_downgrade(struct svc_rqst *rqstp,
struct nfsd4_compound_state *cstate,
struct nfsd4_open_downgrade *od)
{
__be32 status;
struct nfs4_stateid *stp;
unsigned int share_access;
dprintk("NFSD: nfsd4_open_downgrade on file %.*s\n",
(int)cstate->current_fh.fh_dentry->d_name.len,
cstate->current_fh.fh_dentry->d_name.name);
if (!access_valid(od->od_share_access)
|| !deny_valid(od->od_share_deny))
return nfserr_inval;
nfs4_lock_state();
if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
od->od_seqid,
&od->od_stateid,
OPEN_STATE,
&od->od_stateowner, &stp, NULL)))
goto out;
status = nfserr_inval;
if (!test_bit(od->od_share_access, &stp->st_access_bmap)) {
dprintk("NFSD:access not a subset current bitmap: 0x%lx, input access=%08x\n",
stp->st_access_bmap, od->od_share_access);
goto out;
}
if (!test_bit(od->od_share_deny, &stp->st_deny_bmap)) {
dprintk("NFSD:deny not a subset current bitmap: 0x%lx, input deny=%08x\n",
stp->st_deny_bmap, od->od_share_deny);
goto out;
}
set_access(&share_access, stp->st_access_bmap);
nfs4_file_downgrade(stp->st_vfs_file,
share_access & ~od->od_share_access);
reset_union_bmap_access(od->od_share_access, &stp->st_access_bmap);
reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
update_stateid(&stp->st_stateid);
memcpy(&od->od_stateid, &stp->st_stateid, sizeof(stateid_t));
status = nfs_ok;
out:
if (od->od_stateowner) {
nfs4_get_stateowner(od->od_stateowner);
cstate->replay_owner = od->od_stateowner;
}
nfs4_unlock_state();
return status;
}
/*
* nfs4_unlock_state() called after encode
*/
__be32
nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
struct nfsd4_close *close)
{
__be32 status;
struct nfs4_stateid *stp;
dprintk("NFSD: nfsd4_close on file %.*s\n",
(int)cstate->current_fh.fh_dentry->d_name.len,
cstate->current_fh.fh_dentry->d_name.name);
nfs4_lock_state();
/* check close_lru for replay */
if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
close->cl_seqid,
&close->cl_stateid,
OPEN_STATE | CLOSE_STATE,
&close->cl_stateowner, &stp, NULL)))
goto out;
status = nfs_ok;
update_stateid(&stp->st_stateid);
memcpy(&close->cl_stateid, &stp->st_stateid, sizeof(stateid_t));
/* release_stateid() calls nfsd_close() if needed */
release_stateid(stp, OPEN_STATE);
/* place unused nfs4_stateowners on so_close_lru list to be
* released by the laundromat service after the lease period
* to enable us to handle CLOSE replay
*/
if (list_empty(&close->cl_stateowner->so_stateids))
move_to_close_lru(close->cl_stateowner);
out:
if (close->cl_stateowner) {
nfs4_get_stateowner(close->cl_stateowner);
cstate->replay_owner = close->cl_stateowner;
}
nfs4_unlock_state();
return status;
}
__be32
nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
struct nfsd4_delegreturn *dr)
{
__be32 status;
if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
goto out;
nfs4_lock_state();
status = nfs4_preprocess_stateid_op(&cstate->current_fh,
&dr->dr_stateid, DELEG_RET, NULL);
nfs4_unlock_state();
out:
return status;
}
/*
* Lock owner state (byte-range locks)
*/
#define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
#define LOCK_HASH_BITS 8
#define LOCK_HASH_SIZE (1 << LOCK_HASH_BITS)
#define LOCK_HASH_MASK (LOCK_HASH_SIZE - 1)
#define lockownerid_hashval(id) \
((id) & LOCK_HASH_MASK)
static inline unsigned int
lock_ownerstr_hashval(struct inode *inode, u32 cl_id,
struct xdr_netobj *ownername)
{
return (file_hashval(inode) + cl_id
+ opaque_hashval(ownername->data, ownername->len))
& LOCK_HASH_MASK;
}
static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE];
static struct list_head lock_ownerstr_hashtbl[LOCK_HASH_SIZE];
static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];
static struct nfs4_stateid *
find_stateid(stateid_t *stid, int flags)
{
struct nfs4_stateid *local = NULL;
u32 st_id = stid->si_stateownerid;
u32 f_id = stid->si_fileid;
unsigned int hashval;
dprintk("NFSD: find_stateid flags 0x%x\n",flags);
if ((flags & LOCK_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
hashval = stateid_hashval(st_id, f_id);
list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {
if ((local->st_stateid.si_stateownerid == st_id) &&
(local->st_stateid.si_fileid == f_id))
return local;
}
}
if ((flags & OPEN_STATE) || (flags & RD_STATE) || (flags & WR_STATE)) {
hashval = stateid_hashval(st_id, f_id);
list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {
if ((local->st_stateid.si_stateownerid == st_id) &&
(local->st_stateid.si_fileid == f_id))
return local;
}
}
return NULL;
}
static struct nfs4_delegation *
find_delegation_stateid(struct inode *ino, stateid_t *stid)
{
struct nfs4_file *fp;
struct nfs4_delegation *dl;
dprintk("NFSD:find_delegation_stateid stateid=(%08x/%08x/%08x/%08x)\n",
stid->si_boot, stid->si_stateownerid,
stid->si_fileid, stid->si_generation);
fp = find_file(ino);
if (!fp)
return NULL;
dl = find_delegation_file(fp, stid);
put_nfs4_file(fp);
return dl;
}
/*
* TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
* we can't properly handle lock requests that go beyond the (2^63 - 1)-th
* byte, because of sign extension problems. Since NFSv4 calls for 64-bit
* locking, this prevents us from being completely protocol-compliant. The
* real solution to this problem is to start using unsigned file offsets in
* the VFS, but this is a very deep change!
*/
static inline void
nfs4_transform_lock_offset(struct file_lock *lock)
{
if (lock->fl_start < 0)
lock->fl_start = OFFSET_MAX;
if (lock->fl_end < 0)
lock->fl_end = OFFSET_MAX;
}
/* Hack!: For now, we're defining this just so we can use a pointer to it
* as a unique cookie to identify our (NFSv4's) posix locks. */
static struct lock_manager_operations nfsd_posix_mng_ops = {
};
static inline void
nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
{
struct nfs4_stateowner *sop;
unsigned int hval;
if (fl->fl_lmops == &nfsd_posix_mng_ops) {
sop = (struct nfs4_stateowner *) fl->fl_owner;
hval = lockownerid_hashval(sop->so_id);
kref_get(&sop->so_ref);
deny->ld_sop = sop;
deny->ld_clientid = sop->so_client->cl_clientid;
} else {
deny->ld_sop = NULL;
deny->ld_clientid.cl_boot = 0;
deny->ld_clientid.cl_id = 0;
}
deny->ld_start = fl->fl_start;
deny->ld_length = ~(u64)0;
if (fl->fl_end != ~(u64)0)
deny->ld_length = fl->fl_end - fl->fl_start + 1;
deny->ld_type = NFS4_READ_LT;
if (fl->fl_type != F_RDLCK)
deny->ld_type = NFS4_WRITE_LT;
}
static struct nfs4_stateowner *
find_lockstateowner_str(struct inode *inode, clientid_t *clid,
struct xdr_netobj *owner)
{
unsigned int hashval = lock_ownerstr_hashval(inode, clid->cl_id, owner);
struct nfs4_stateowner *op;
list_for_each_entry(op, &lock_ownerstr_hashtbl[hashval], so_strhash) {
if (same_owner_str(op, owner, clid))
return op;
}
return NULL;
}
/*
* Alloc a lock owner structure.
* Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
* occured.
*
* strhashval = lock_ownerstr_hashval
*/
static struct nfs4_stateowner *
alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_stateid *open_stp, struct nfsd4_lock *lock) {
struct nfs4_stateowner *sop;
struct nfs4_replay *rp;
unsigned int idhashval;
if (!(sop = alloc_stateowner(&lock->lk_new_owner)))
return NULL;
idhashval = lockownerid_hashval(current_ownerid);
INIT_LIST_HEAD(&sop->so_idhash);
INIT_LIST_HEAD(&sop->so_strhash);
INIT_LIST_HEAD(&sop->so_perclient);
INIT_LIST_HEAD(&sop->so_stateids);
INIT_LIST_HEAD(&sop->so_perstateid);
INIT_LIST_HEAD(&sop->so_close_lru); /* not used */
sop->so_time = 0;
list_add(&sop->so_idhash, &lock_ownerid_hashtbl[idhashval]);
list_add(&sop->so_strhash, &lock_ownerstr_hashtbl[strhashval]);
list_add(&sop->so_perstateid, &open_stp->st_lockowners);
sop->so_is_open_owner = 0;
sop->so_id = current_ownerid++;
sop->so_client = clp;
/* It is the openowner seqid that will be incremented in encode in the
* case of new lockowners; so increment the lock seqid manually: */
sop->so_seqid = lock->lk_new_lock_seqid + 1;
sop->so_confirmed = 1;
rp = &sop->so_replay;
rp->rp_status = nfserr_serverfault;
rp->rp_buflen = 0;
rp->rp_buf = rp->rp_ibuf;
return sop;
}
static struct nfs4_stateid *
alloc_init_lock_stateid(struct nfs4_stateowner *sop, struct nfs4_file *fp, struct nfs4_stateid *open_stp)
{
struct nfs4_stateid *stp;
unsigned int hashval = stateid_hashval(sop->so_id, fp->fi_id);
stp = nfs4_alloc_stateid();
if (stp == NULL)
goto out;
INIT_LIST_HEAD(&stp->st_hash);
INIT_LIST_HEAD(&stp->st_perfile);
INIT_LIST_HEAD(&stp->st_perstateowner);
INIT_LIST_HEAD(&stp->st_lockowners); /* not used */
list_add(&stp->st_hash, &lockstateid_hashtbl[hashval]);
list_add(&stp->st_perfile, &fp->fi_stateids);
list_add(&stp->st_perstateowner, &sop->so_stateids);
stp->st_stateowner = sop;
get_nfs4_file(fp);
stp->st_file = fp;
stp->st_stateid.si_boot = boot_time;
stp->st_stateid.si_stateownerid = sop->so_id;
stp->st_stateid.si_fileid = fp->fi_id;
stp->st_stateid.si_generation = 0;
stp->st_vfs_file = open_stp->st_vfs_file; /* FIXME refcount?? */
stp->st_access_bmap = open_stp->st_access_bmap;
stp->st_deny_bmap = open_stp->st_deny_bmap;
stp->st_openstp = open_stp;
out:
return stp;
}
static int
check_lock_length(u64 offset, u64 length)
{
return ((length == 0) || ((length != ~(u64)0) &&
LOFF_OVERFLOW(offset, length)));
}
/*
* LOCK operation
*/
__be32
nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
struct nfsd4_lock *lock)
{
struct nfs4_stateowner *open_sop = NULL;
struct nfs4_stateowner *lock_sop = NULL;
struct nfs4_stateid *lock_stp;
struct file *filp;
struct file_lock file_lock;
struct file_lock conflock;
__be32 status = 0;
unsigned int strhashval;
unsigned int cmd;
int err;
dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
(long long) lock->lk_offset,
(long long) lock->lk_length);
if (check_lock_length(lock->lk_offset, lock->lk_length))
return nfserr_inval;
if ((status = fh_verify(rqstp, &cstate->current_fh,
S_IFREG, NFSD_MAY_LOCK))) {
dprintk("NFSD: nfsd4_lock: permission denied!\n");
return status;
}
nfs4_lock_state();
if (lock->lk_is_new) {
/*
* Client indicates that this is a new lockowner.
* Use open owner and open stateid to create lock owner and
* lock stateid.
*/
struct nfs4_stateid *open_stp = NULL;
struct nfs4_file *fp;
status = nfserr_stale_clientid;
if (STALE_CLIENTID(&lock->lk_new_clientid))
goto out;
/* validate and update open stateid and open seqid */
status = nfs4_preprocess_seqid_op(&cstate->current_fh,
lock->lk_new_open_seqid,
&lock->lk_new_open_stateid,
OPEN_STATE,
&lock->lk_replay_owner, &open_stp,
lock);
if (status)
goto out;
open_sop = lock->lk_replay_owner;
/* create lockowner and lock stateid */
fp = open_stp->st_file;
strhashval = lock_ownerstr_hashval(fp->fi_inode,
open_sop->so_client->cl_clientid.cl_id,
&lock->v.new.owner);
/* XXX: Do we need to check for duplicate stateowners on
* the same file, or should they just be allowed (and
* create new stateids)? */
status = nfserr_resource;
lock_sop = alloc_init_lock_stateowner(strhashval,
open_sop->so_client, open_stp, lock);
if (lock_sop == NULL)
goto out;
lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp);
if (lock_stp == NULL)
goto out;
} else {
/* lock (lock owner + lock stateid) already exists */
status = nfs4_preprocess_seqid_op(&cstate->current_fh,
lock->lk_old_lock_seqid,
&lock->lk_old_lock_stateid,
LOCK_STATE,
&lock->lk_replay_owner, &lock_stp, lock);
if (status)
goto out;
lock_sop = lock->lk_replay_owner;
}
/* lock->lk_replay_owner and lock_stp have been created or found */
filp = lock_stp->st_vfs_file;
status = nfserr_grace;
if (locks_in_grace() && !lock->lk_reclaim)
goto out;
status = nfserr_no_grace;
if (!locks_in_grace() && lock->lk_reclaim)
goto out;
locks_init_lock(&file_lock);
switch (lock->lk_type) {
case NFS4_READ_LT:
case NFS4_READW_LT:
file_lock.fl_type = F_RDLCK;
cmd = F_SETLK;
break;
case NFS4_WRITE_LT:
case NFS4_WRITEW_LT:
file_lock.fl_type = F_WRLCK;
cmd = F_SETLK;
break;
default:
status = nfserr_inval;
goto out;
}
file_lock.fl_owner = (fl_owner_t)lock_sop;
file_lock.fl_pid = current->tgid;
file_lock.fl_file = filp;
file_lock.fl_flags = FL_POSIX;
file_lock.fl_lmops = &nfsd_posix_mng_ops;
file_lock.fl_start = lock->lk_offset;
if ((lock->lk_length == ~(u64)0) ||
LOFF_OVERFLOW(lock->lk_offset, lock->lk_length))
file_lock.fl_end = ~(u64)0;
else
file_lock.fl_end = lock->lk_offset + lock->lk_length - 1;
nfs4_transform_lock_offset(&file_lock);
/*
* Try to lock the file in the VFS.
* Note: locks.c uses the BKL to protect the inode's lock list.
*/
err = vfs_lock_file(filp, cmd, &file_lock, &conflock);
switch (-err) {
case 0: /* success! */
update_stateid(&lock_stp->st_stateid);
memcpy(&lock->lk_resp_stateid, &lock_stp->st_stateid,
sizeof(stateid_t));
status = 0;
break;
case (EAGAIN): /* conflock holds conflicting lock */
status = nfserr_denied;
dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
nfs4_set_lock_denied(&conflock, &lock->lk_denied);
break;
case (EDEADLK):
status = nfserr_deadlock;
break;
default:
dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
status = nfserr_resource;
break;
}
out:
if (status && lock->lk_is_new && lock_sop)
release_stateowner(lock_sop);
if (lock->lk_replay_owner) {
nfs4_get_stateowner(lock->lk_replay_owner);
cstate->replay_owner = lock->lk_replay_owner;
}
nfs4_unlock_state();
return status;
}
/*
* LOCKT operation
*/
__be32
nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
struct nfsd4_lockt *lockt)
{
struct inode *inode;
struct file file;
struct file_lock file_lock;
int error;
__be32 status;
if (locks_in_grace())
return nfserr_grace;
if (check_lock_length(lockt->lt_offset, lockt->lt_length))
return nfserr_inval;
lockt->lt_stateowner = NULL;
nfs4_lock_state();
status = nfserr_stale_clientid;
if (STALE_CLIENTID(&lockt->lt_clientid))
goto out;
if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0))) {
dprintk("NFSD: nfsd4_lockt: fh_verify() failed!\n");
if (status == nfserr_symlink)
status = nfserr_inval;
goto out;
}
inode = cstate->current_fh.fh_dentry->d_inode;
locks_init_lock(&file_lock);
switch (lockt->lt_type) {
case NFS4_READ_LT:
case NFS4_READW_LT:
file_lock.fl_type = F_RDLCK;
break;
case NFS4_WRITE_LT:
case NFS4_WRITEW_LT:
file_lock.fl_type = F_WRLCK;
break;
default:
dprintk("NFSD: nfs4_lockt: bad lock type!\n");
status = nfserr_inval;
goto out;
}
lockt->lt_stateowner = find_lockstateowner_str(inode,
&lockt->lt_clientid, &lockt->lt_owner);
if (lockt->lt_stateowner)
file_lock.fl_owner = (fl_owner_t)lockt->lt_stateowner;
file_lock.fl_pid = current->tgid;
file_lock.fl_flags = FL_POSIX;
file_lock.fl_lmops = &nfsd_posix_mng_ops;
file_lock.fl_start = lockt->lt_offset;
if ((lockt->lt_length == ~(u64)0) || LOFF_OVERFLOW(lockt->lt_offset, lockt->lt_length))
file_lock.fl_end = ~(u64)0;
else
file_lock.fl_end = lockt->lt_offset + lockt->lt_length - 1;
nfs4_transform_lock_offset(&file_lock);
/* vfs_test_lock uses the struct file _only_ to resolve the inode.
* since LOCKT doesn't require an OPEN, and therefore a struct
* file may not exist, pass vfs_test_lock a struct file with
* only the dentry:inode set.
*/
memset(&file, 0, sizeof (struct file));
file.f_path.dentry = cstate->current_fh.fh_dentry;
status = nfs_ok;
error = vfs_test_lock(&file, &file_lock);
if (error) {
status = nfserrno(error);
goto out;
}
if (file_lock.fl_type != F_UNLCK) {
status = nfserr_denied;
nfs4_set_lock_denied(&file_lock, &lockt->lt_denied);
}
out:
nfs4_unlock_state();
return status;
}
__be32
nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
struct nfsd4_locku *locku)
{
struct nfs4_stateid *stp;
struct file *filp = NULL;
struct file_lock file_lock;
__be32 status;
int err;
dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
(long long) locku->lu_offset,
(long long) locku->lu_length);
if (check_lock_length(locku->lu_offset, locku->lu_length))
return nfserr_inval;
nfs4_lock_state();
if ((status = nfs4_preprocess_seqid_op(&cstate->current_fh,
locku->lu_seqid,
&locku->lu_stateid,
LOCK_STATE,
&locku->lu_stateowner, &stp, NULL)))
goto out;
filp = stp->st_vfs_file;
BUG_ON(!filp);
locks_init_lock(&file_lock);
file_lock.fl_type = F_UNLCK;
file_lock.fl_owner = (fl_owner_t) locku->lu_stateowner;
file_lock.fl_pid = current->tgid;
file_lock.fl_file = filp;
file_lock.fl_flags = FL_POSIX;
file_lock.fl_lmops = &nfsd_posix_mng_ops;
file_lock.fl_start = locku->lu_offset;
if ((locku->lu_length == ~(u64)0) || LOFF_OVERFLOW(locku->lu_offset, locku->lu_length))
file_lock.fl_end = ~(u64)0;
else
file_lock.fl_end = locku->lu_offset + locku->lu_length - 1;
nfs4_transform_lock_offset(&file_lock);
/*
* Try to unlock the file in the VFS.
*/
err = vfs_lock_file(filp, F_SETLK, &file_lock, NULL);
if (err) {
dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
goto out_nfserr;
}
/*
* OK, unlock succeeded; the only thing left to do is update the stateid.
*/
update_stateid(&stp->st_stateid);
memcpy(&locku->lu_stateid, &stp->st_stateid, sizeof(stateid_t));
out:
if (locku->lu_stateowner) {
nfs4_get_stateowner(locku->lu_stateowner);
cstate->replay_owner = locku->lu_stateowner;
}
nfs4_unlock_state();
return status;
out_nfserr:
status = nfserrno(err);
goto out;
}
/*
* returns
* 1: locks held by lockowner
* 0: no locks held by lockowner
*/
static int
check_for_locks(struct file *filp, struct nfs4_stateowner *lowner)
{
struct file_lock **flpp;
struct inode *inode = filp->f_path.dentry->d_inode;
int status = 0;
lock_kernel();
for (flpp = &inode->i_flock; *flpp != NULL; flpp = &(*flpp)->fl_next) {
if ((*flpp)->fl_owner == (fl_owner_t)lowner) {
status = 1;
goto out;
}
}
out:
unlock_kernel();
return status;
}
__be32
nfsd4_release_lockowner(struct svc_rqst *rqstp,
struct nfsd4_compound_state *cstate,
struct nfsd4_release_lockowner *rlockowner)
{
clientid_t *clid = &rlockowner->rl_clientid;
struct nfs4_stateowner *sop;
struct nfs4_stateid *stp;
struct xdr_netobj *owner = &rlockowner->rl_owner;
struct list_head matches;
int i;
__be32 status;
dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
clid->cl_boot, clid->cl_id);
/* XXX check for lease expiration */
status = nfserr_stale_clientid;
if (STALE_CLIENTID(clid))
return status;
nfs4_lock_state();
status = nfserr_locks_held;
/* XXX: we're doing a linear search through all the lockowners.
* Yipes! For now we'll just hope clients aren't really using
* release_lockowner much, but eventually we have to fix these
* data structures. */
INIT_LIST_HEAD(&matches);
for (i = 0; i < LOCK_HASH_SIZE; i++) {
list_for_each_entry(sop, &lock_ownerid_hashtbl[i], so_idhash) {
if (!same_owner_str(sop, owner, clid))
continue;
list_for_each_entry(stp, &sop->so_stateids,
st_perstateowner) {
if (check_for_locks(stp->st_vfs_file, sop))
goto out;
/* Note: so_perclient unused for lockowners,
* so it's OK to fool with here. */
list_add(&sop->so_perclient, &matches);
}
}
}
/* Clients probably won't expect us to return with some (but not all)
* of the lockowner state released; so don't release any until all
* have been checked. */
status = nfs_ok;
while (!list_empty(&matches)) {
sop = list_entry(matches.next, struct nfs4_stateowner,
so_perclient);
/* unhash_stateowner deletes so_perclient only
* for openowners. */
list_del(&sop->so_perclient);
release_stateowner(sop);
}
out:
nfs4_unlock_state();
return status;
}
static inline struct nfs4_client_reclaim *
alloc_reclaim(void)
{
return kmalloc(sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
}
int
nfs4_has_reclaimed_state(const char *name)
{
unsigned int strhashval = clientstr_hashval(name);
struct nfs4_client *clp;
clp = find_confirmed_client_by_str(name, strhashval);
return clp ? 1 : 0;
}
/*
* failure => all reset bets are off, nfserr_no_grace...
*/
int
nfs4_client_to_reclaim(const char *name)
{
unsigned int strhashval;
struct nfs4_client_reclaim *crp = NULL;
dprintk("NFSD nfs4_client_to_reclaim NAME: %.*s\n", HEXDIR_LEN, name);
crp = alloc_reclaim();
if (!crp)
return 0;
strhashval = clientstr_hashval(name);
INIT_LIST_HEAD(&crp->cr_strhash);
list_add(&crp->cr_strhash, &reclaim_str_hashtbl[strhashval]);
memcpy(crp->cr_recdir, name, HEXDIR_LEN);
reclaim_str_hashtbl_size++;
return 1;
}
static void
nfs4_release_reclaim(void)
{
struct nfs4_client_reclaim *crp = NULL;
int i;
for (i = 0; i < CLIENT_HASH_SIZE; i++) {
while (!list_empty(&reclaim_str_hashtbl[i])) {
crp = list_entry(reclaim_str_hashtbl[i].next,
struct nfs4_client_reclaim, cr_strhash);
list_del(&crp->cr_strhash);
kfree(crp);
reclaim_str_hashtbl_size--;
}
}
BUG_ON(reclaim_str_hashtbl_size);
}
/*
* called from OPEN, CLAIM_PREVIOUS with a new clientid. */
static struct nfs4_client_reclaim *
nfs4_find_reclaim_client(clientid_t *clid)
{
unsigned int strhashval;
struct nfs4_client *clp;
struct nfs4_client_reclaim *crp = NULL;
/* find clientid in conf_id_hashtbl */
clp = find_confirmed_client(clid);
if (clp == NULL)
return NULL;
dprintk("NFSD: nfs4_find_reclaim_client for %.*s with recdir %s\n",
clp->cl_name.len, clp->cl_name.data,
clp->cl_recdir);
/* find clp->cl_name in reclaim_str_hashtbl */
strhashval = clientstr_hashval(clp->cl_recdir);
list_for_each_entry(crp, &reclaim_str_hashtbl[strhashval], cr_strhash) {
if (same_name(crp->cr_recdir, clp->cl_recdir)) {
return crp;
}
}
return NULL;
}
/*
* Called from OPEN. Look for clientid in reclaim list.
*/
__be32
nfs4_check_open_reclaim(clientid_t *clid)
{
return nfs4_find_reclaim_client(clid) ? nfs_ok : nfserr_reclaim_bad;
}
/* initialization to perform at module load time: */
int
nfs4_state_init(void)
{
int i, status;
status = nfsd4_init_slabs();
if (status)
return status;
for (i = 0; i < CLIENT_HASH_SIZE; i++) {
INIT_LIST_HEAD(&conf_id_hashtbl[i]);
INIT_LIST_HEAD(&conf_str_hashtbl[i]);
INIT_LIST_HEAD(&unconf_str_hashtbl[i]);
INIT_LIST_HEAD(&unconf_id_hashtbl[i]);
}
for (i = 0; i < FILE_HASH_SIZE; i++) {
INIT_LIST_HEAD(&file_hashtbl[i]);
}
for (i = 0; i < OWNER_HASH_SIZE; i++) {
INIT_LIST_HEAD(&ownerstr_hashtbl[i]);
INIT_LIST_HEAD(&ownerid_hashtbl[i]);
}
for (i = 0; i < STATEID_HASH_SIZE; i++) {
INIT_LIST_HEAD(&stateid_hashtbl[i]);
INIT_LIST_HEAD(&lockstateid_hashtbl[i]);
}
for (i = 0; i < LOCK_HASH_SIZE; i++) {
INIT_LIST_HEAD(&lock_ownerid_hashtbl[i]);
INIT_LIST_HEAD(&lock_ownerstr_hashtbl[i]);
}
memset(&onestateid, ~0, sizeof(stateid_t));
INIT_LIST_HEAD(&close_lru);
INIT_LIST_HEAD(&client_lru);
INIT_LIST_HEAD(&del_recall_lru);
for (i = 0; i < CLIENT_HASH_SIZE; i++)
INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
reclaim_str_hashtbl_size = 0;
return 0;
}
static void
nfsd4_load_reboot_recovery_data(void)
{
int status;
nfs4_lock_state();
nfsd4_init_recdir(user_recovery_dirname);
status = nfsd4_recdir_load();
nfs4_unlock_state();
if (status)
printk("NFSD: Failure reading reboot recovery data\n");
}
unsigned long
get_nfs4_grace_period(void)
{
return max(user_lease_time, lease_time) * HZ;
}
/*
* Since the lifetime of a delegation isn't limited to that of an open, a
* client may quite reasonably hang on to a delegation as long as it has
* the inode cached. This becomes an obvious problem the first time a
* client's inode cache approaches the size of the server's total memory.
*
* For now we avoid this problem by imposing a hard limit on the number
* of delegations, which varies according to the server's memory size.
*/
static void
set_max_delegations(void)
{
/*
* Allow at most 4 delegations per megabyte of RAM. Quick
* estimates suggest that in the worst case (where every delegation
* is for a different inode), a delegation could take about 1.5K,
* giving a worst case usage of about 6% of memory.
*/
max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
}
/* initialization to perform when the nfsd service is started: */
static void
__nfs4_state_start(void)
{
unsigned long grace_time;
boot_time = get_seconds();
grace_time = get_nfs4_grace_period();
lease_time = user_lease_time;
locks_start_grace(&nfsd4_manager);
printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
grace_time/HZ);
laundry_wq = create_singlethread_workqueue("nfsd4");
queue_delayed_work(laundry_wq, &laundromat_work, grace_time);
set_max_delegations();
}
void
nfs4_state_start(void)
{
if (nfs4_init)
return;
nfsd4_load_reboot_recovery_data();
__nfs4_state_start();
nfs4_init = 1;
return;
}
time_t
nfs4_lease_time(void)
{
return lease_time;
}
static void
__nfs4_state_shutdown(void)
{
int i;
struct nfs4_client *clp = NULL;
struct nfs4_delegation *dp = NULL;
struct list_head *pos, *next, reaplist;
for (i = 0; i < CLIENT_HASH_SIZE; i++) {
while (!list_empty(&conf_id_hashtbl[i])) {
clp = list_entry(conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
expire_client(clp);
}
while (!list_empty(&unconf_str_hashtbl[i])) {
clp = list_entry(unconf_str_hashtbl[i].next, struct nfs4_client, cl_strhash);
expire_client(clp);
}
}
INIT_LIST_HEAD(&reaplist);
spin_lock(&recall_lock);
list_for_each_safe(pos, next, &del_recall_lru) {
dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
list_move(&dp->dl_recall_lru, &reaplist);
}
spin_unlock(&recall_lock);
list_for_each_safe(pos, next, &reaplist) {
dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
list_del_init(&dp->dl_recall_lru);
unhash_delegation(dp);
}
nfsd4_shutdown_recdir();
nfs4_init = 0;
}
void
nfs4_state_shutdown(void)
{
cancel_rearming_delayed_workqueue(laundry_wq, &laundromat_work);
destroy_workqueue(laundry_wq);
nfs4_lock_state();
nfs4_release_reclaim();
__nfs4_state_shutdown();
nfs4_unlock_state();
}
/*
* user_recovery_dirname is protected by the nfsd_mutex since it's only
* accessed when nfsd is starting.
*/
static void
nfs4_set_recdir(char *recdir)
{
strcpy(user_recovery_dirname, recdir);
}
/*
* Change the NFSv4 recovery directory to recdir.
*/
int
nfs4_reset_recoverydir(char *recdir)
{
int status;
struct nameidata nd;
status = path_lookup(recdir, LOOKUP_FOLLOW, &nd);
if (status)
return status;
status = -ENOTDIR;
if (S_ISDIR(nd.path.dentry->d_inode->i_mode)) {
nfs4_set_recdir(recdir);
status = 0;
}
path_put(&nd.path);
return status;
}
char *
nfs4_recoverydir(void)
{
return user_recovery_dirname;
}
/*
* Called when leasetime is changed.
*
* The only way the protocol gives us to handle on-the-fly lease changes is to
* simulate a reboot. Instead of doing that, we just wait till the next time
* we start to register any changes in lease time. If the administrator
* really wants to change the lease time *now*, they can go ahead and bring
* nfsd down and then back up again after changing the lease time.
*
* user_lease_time is protected by nfsd_mutex since it's only really accessed
* when nfsd is starting
*/
void
nfs4_reset_lease(time_t leasetime)
{
user_lease_time = leasetime;
}
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