[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/os/linux/linux-3.4.x/fs/nfsd/nfs4state.c b/ap/os/linux/linux-3.4.x/fs/nfsd/nfs4state.c
new file mode 100644
index 0000000..6143a1e
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/fs/nfsd/nfs4state.c
@@ -0,0 +1,4900 @@
+/*
+* 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/file.h>
+#include <linux/fs.h>
+#include <linux/slab.h>
+#include <linux/namei.h>
+#include <linux/swap.h>
+#include <linux/pagemap.h>
+#include <linux/sunrpc/svcauth_gss.h>
+#include <linux/sunrpc/clnt.h>
+#include "xdr4.h"
+#include "vfs.h"
+
+#define NFSDDBG_FACILITY NFSDDBG_PROC
+
+/* Globals */
+time_t nfsd4_lease = 90; /* default lease time */
+time_t nfsd4_grace = 90;
+static time_t boot_time;
+
+#define all_ones {{~0,~0},~0}
+static const stateid_t one_stateid = {
+ .si_generation = ~0,
+ .si_opaque = all_ones,
+};
+static const stateid_t zero_stateid = {
+ /* all fields zero */
+};
+static const stateid_t currentstateid = {
+ .si_generation = 1,
+};
+
+static u64 current_sessionid = 1;
+
+#define ZERO_STATEID(stateid) (!memcmp((stateid), &zero_stateid, sizeof(stateid_t)))
+#define ONE_STATEID(stateid) (!memcmp((stateid), &one_stateid, sizeof(stateid_t)))
+#define CURRENT_STATEID(stateid) (!memcmp((stateid), ¤tstateid, sizeof(stateid_t)))
+
+/* forward declarations */
+static int check_for_locks(struct nfs4_file *filp, struct nfs4_lockowner *lowner);
+
+/* Locking: */
+
+/* Currently used for almost all code touching nfsv4 state: */
+static DEFINE_MUTEX(client_mutex);
+
+/*
+ * Currently used for the del_recall_lru and file hash table. In an
+ * effort to decrease the scope of the client_mutex, this spinlock may
+ * eventually cover more:
+ */
+static DEFINE_SPINLOCK(recall_lock);
+
+static struct kmem_cache *openowner_slab = NULL;
+static struct kmem_cache *lockowner_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);
+}
+
+static void free_session(struct kref *);
+
+/* Must be called under the client_lock */
+static void nfsd4_put_session_locked(struct nfsd4_session *ses)
+{
+ kref_put(&ses->se_ref, free_session);
+}
+
+static void nfsd4_get_session(struct nfsd4_session *ses)
+{
+ kref_get(&ses->se_ref);
+}
+
+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;
+}
+
+static struct list_head del_recall_lru;
+
+static void nfsd4_free_file(struct nfs4_file *f)
+{
+ kmem_cache_free(file_slab, f);
+}
+
+static inline void
+put_nfs4_file(struct nfs4_file *fi)
+{
+ if (atomic_dec_and_lock(&fi->fi_ref, &recall_lock)) {
+ list_del(&fi->fi_hash);
+ spin_unlock(&recall_lock);
+ iput(fi->fi_inode);
+ nfsd4_free_file(fi);
+ }
+}
+
+static inline void
+get_nfs4_file(struct nfs4_file *fi)
+{
+ atomic_inc(&fi->fi_ref);
+}
+
+static int num_delegations;
+unsigned int max_delegations;
+
+/*
+ * Open owner state (share locks)
+ */
+
+/* hash tables for lock and open owners */
+#define OWNER_HASH_BITS 8
+#define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
+#define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
+
+static unsigned int ownerstr_hashval(u32 clientid, struct xdr_netobj *ownername)
+{
+ unsigned int ret;
+
+ ret = opaque_hashval(ownername->data, ownername->len);
+ ret += clientid;
+ return ret & OWNER_HASH_MASK;
+}
+
+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)
+
+static unsigned int file_hashval(struct inode *ino)
+{
+ /* XXX: why are we hashing on inode pointer, anyway? */
+ return hash_ptr(ino, FILE_HASH_BITS);
+}
+
+static struct list_head file_hashtbl[FILE_HASH_SIZE];
+
+static void __nfs4_file_get_access(struct nfs4_file *fp, int oflag)
+{
+ BUG_ON(!(fp->fi_fds[oflag] || fp->fi_fds[O_RDWR]));
+ atomic_inc(&fp->fi_access[oflag]);
+}
+
+static void nfs4_file_get_access(struct nfs4_file *fp, int oflag)
+{
+ if (oflag == O_RDWR) {
+ __nfs4_file_get_access(fp, O_RDONLY);
+ __nfs4_file_get_access(fp, O_WRONLY);
+ } else
+ __nfs4_file_get_access(fp, oflag);
+}
+
+static void nfs4_file_put_fd(struct nfs4_file *fp, int oflag)
+{
+ if (fp->fi_fds[oflag]) {
+ fput(fp->fi_fds[oflag]);
+ fp->fi_fds[oflag] = NULL;
+ }
+}
+
+static void __nfs4_file_put_access(struct nfs4_file *fp, int oflag)
+{
+ if (atomic_dec_and_test(&fp->fi_access[oflag])) {
+ nfs4_file_put_fd(fp, oflag);
+ if (atomic_read(&fp->fi_access[1 - oflag]) == 0)
+ nfs4_file_put_fd(fp, O_RDWR);
+ }
+}
+
+static void nfs4_file_put_access(struct nfs4_file *fp, int oflag)
+{
+ if (oflag == O_RDWR) {
+ __nfs4_file_put_access(fp, O_RDONLY);
+ __nfs4_file_put_access(fp, O_WRONLY);
+ } else
+ __nfs4_file_put_access(fp, oflag);
+}
+
+static inline int get_new_stid(struct nfs4_stid *stid)
+{
+ static int min_stateid = 0;
+ struct idr *stateids = &stid->sc_client->cl_stateids;
+ int new_stid;
+ int error;
+
+ error = idr_get_new_above(stateids, stid, min_stateid, &new_stid);
+ /*
+ * Note: the necessary preallocation was done in
+ * nfs4_alloc_stateid(). The idr code caps the number of
+ * preallocations that can exist at a time, but the state lock
+ * prevents anyone from using ours before we get here:
+ */
+ BUG_ON(error);
+ /*
+ * It shouldn't be a problem to reuse an opaque stateid value.
+ * I don't think it is for 4.1. But with 4.0 I worry that, for
+ * example, a stray write retransmission could be accepted by
+ * the server when it should have been rejected. Therefore,
+ * adopt a trick from the sctp code to attempt to maximize the
+ * amount of time until an id is reused, by ensuring they always
+ * "increase" (mod INT_MAX):
+ */
+
+ min_stateid = new_stid+1;
+ if (min_stateid == INT_MAX)
+ min_stateid = 0;
+ return new_stid;
+}
+
+static void init_stid(struct nfs4_stid *stid, struct nfs4_client *cl, unsigned char type)
+{
+ stateid_t *s = &stid->sc_stateid;
+ int new_id;
+
+ stid->sc_type = type;
+ stid->sc_client = cl;
+ s->si_opaque.so_clid = cl->cl_clientid;
+ new_id = get_new_stid(stid);
+ s->si_opaque.so_id = (u32)new_id;
+ /* Will be incremented before return to client: */
+ s->si_generation = 0;
+}
+
+static struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct kmem_cache *slab)
+{
+ struct idr *stateids = &cl->cl_stateids;
+
+ if (!idr_pre_get(stateids, GFP_KERNEL))
+ return NULL;
+ /*
+ * Note: if we fail here (or any time between now and the time
+ * we actually get the new idr), we won't need to undo the idr
+ * preallocation, since the idr code caps the number of
+ * preallocated entries.
+ */
+ return kmem_cache_alloc(slab, GFP_KERNEL);
+}
+
+static struct nfs4_ol_stateid * nfs4_alloc_stateid(struct nfs4_client *clp)
+{
+ return openlockstateid(nfs4_alloc_stid(clp, stateid_slab));
+}
+
+static struct nfs4_delegation *
+alloc_init_deleg(struct nfs4_client *clp, struct nfs4_ol_stateid *stp, struct svc_fh *current_fh, u32 type)
+{
+ struct nfs4_delegation *dp;
+ struct nfs4_file *fp = stp->st_file;
+
+ dprintk("NFSD alloc_init_deleg\n");
+ /*
+ * Major work on the lease subsystem (for example, to support
+ * calbacks on stat) will be required before we can support
+ * write delegations properly.
+ */
+ if (type != NFS4_OPEN_DELEGATE_READ)
+ return NULL;
+ if (fp->fi_had_conflict)
+ return NULL;
+ if (num_delegations > max_delegations)
+ return NULL;
+ dp = delegstateid(nfs4_alloc_stid(clp, deleg_slab));
+ if (dp == NULL)
+ return dp;
+ init_stid(&dp->dl_stid, clp, NFS4_DELEG_STID);
+ /*
+ * delegation seqid's are never incremented. The 4.1 special
+ * meaning of seqid 0 isn't meaningful, really, but let's avoid
+ * 0 anyway just for consistency and use 1:
+ */
+ dp->dl_stid.sc_stateid.si_generation = 1;
+ num_delegations++;
+ INIT_LIST_HEAD(&dp->dl_perfile);
+ INIT_LIST_HEAD(&dp->dl_perclnt);
+ INIT_LIST_HEAD(&dp->dl_recall_lru);
+ get_nfs4_file(fp);
+ dp->dl_file = fp;
+ dp->dl_type = type;
+ fh_copy_shallow(&dp->dl_fh, ¤t_fh->fh_handle);
+ dp->dl_time = 0;
+ atomic_set(&dp->dl_count, 1);
+ INIT_WORK(&dp->dl_recall.cb_work, nfsd4_do_callback_rpc);
+ 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--;
+ }
+}
+
+static void nfs4_put_deleg_lease(struct nfs4_file *fp)
+{
+ if (atomic_dec_and_test(&fp->fi_delegees)) {
+ vfs_setlease(fp->fi_deleg_file, F_UNLCK, &fp->fi_lease);
+ fp->fi_lease = NULL;
+ fput(fp->fi_deleg_file);
+ fp->fi_deleg_file = NULL;
+ }
+}
+
+static void unhash_stid(struct nfs4_stid *s)
+{
+ struct idr *stateids = &s->sc_client->cl_stateids;
+
+ idr_remove(stateids, s->sc_stateid.si_opaque.so_id);
+}
+
+/* Called under the state lock. */
+static void
+unhash_delegation(struct nfs4_delegation *dp)
+{
+ unhash_stid(&dp->dl_stid);
+ list_del_init(&dp->dl_perclnt);
+ spin_lock(&recall_lock);
+ list_del_init(&dp->dl_perfile);
+ list_del_init(&dp->dl_recall_lru);
+ spin_unlock(&recall_lock);
+ nfs4_put_deleg_lease(dp->dl_file);
+ nfs4_put_delegation(dp);
+}
+
+/*
+ * SETCLIENTID state
+ */
+
+/* client_lock protects the client lru list and session hash table */
+static DEFINE_SPINLOCK(client_lock);
+
+/* 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)
+
+static unsigned int clientid_hashval(u32 id)
+{
+ return id & CLIENT_HASH_MASK;
+}
+
+static unsigned int clientstr_hashval(const char *name)
+{
+ return 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;
+
+/*
+ * 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_ol_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;
+}
+
+static int nfs4_access_to_omode(u32 access)
+{
+ switch (access & NFS4_SHARE_ACCESS_BOTH) {
+ case NFS4_SHARE_ACCESS_READ:
+ return O_RDONLY;
+ case NFS4_SHARE_ACCESS_WRITE:
+ return O_WRONLY;
+ case NFS4_SHARE_ACCESS_BOTH:
+ return O_RDWR;
+ }
+ BUG();
+}
+
+static void unhash_generic_stateid(struct nfs4_ol_stateid *stp)
+{
+ list_del(&stp->st_perfile);
+ list_del(&stp->st_perstateowner);
+}
+
+static void close_generic_stateid(struct nfs4_ol_stateid *stp)
+{
+ int i;
+
+ if (stp->st_access_bmap) {
+ for (i = 1; i < 4; i++) {
+ if (test_bit(i, &stp->st_access_bmap))
+ nfs4_file_put_access(stp->st_file,
+ nfs4_access_to_omode(i));
+ __clear_bit(i, &stp->st_access_bmap);
+ }
+ }
+ put_nfs4_file(stp->st_file);
+ stp->st_file = NULL;
+}
+
+static void free_generic_stateid(struct nfs4_ol_stateid *stp)
+{
+ kmem_cache_free(stateid_slab, stp);
+}
+
+static void release_lock_stateid(struct nfs4_ol_stateid *stp)
+{
+ struct file *file;
+
+ unhash_generic_stateid(stp);
+ unhash_stid(&stp->st_stid);
+ file = find_any_file(stp->st_file);
+ if (file)
+ locks_remove_posix(file, (fl_owner_t)lockowner(stp->st_stateowner));
+ close_generic_stateid(stp);
+ free_generic_stateid(stp);
+}
+
+static void unhash_lockowner(struct nfs4_lockowner *lo)
+{
+ struct nfs4_ol_stateid *stp;
+
+ list_del(&lo->lo_owner.so_strhash);
+ list_del(&lo->lo_perstateid);
+ list_del(&lo->lo_owner_ino_hash);
+ while (!list_empty(&lo->lo_owner.so_stateids)) {
+ stp = list_first_entry(&lo->lo_owner.so_stateids,
+ struct nfs4_ol_stateid, st_perstateowner);
+ release_lock_stateid(stp);
+ }
+}
+
+static void release_lockowner(struct nfs4_lockowner *lo)
+{
+ unhash_lockowner(lo);
+ nfs4_free_lockowner(lo);
+}
+
+static void
+release_stateid_lockowners(struct nfs4_ol_stateid *open_stp)
+{
+ struct nfs4_lockowner *lo;
+
+ while (!list_empty(&open_stp->st_lockowners)) {
+ lo = list_entry(open_stp->st_lockowners.next,
+ struct nfs4_lockowner, lo_perstateid);
+ release_lockowner(lo);
+ }
+}
+
+static void unhash_open_stateid(struct nfs4_ol_stateid *stp)
+{
+ unhash_generic_stateid(stp);
+ release_stateid_lockowners(stp);
+ close_generic_stateid(stp);
+}
+
+static void release_open_stateid(struct nfs4_ol_stateid *stp)
+{
+ unhash_open_stateid(stp);
+ unhash_stid(&stp->st_stid);
+ free_generic_stateid(stp);
+}
+
+static void unhash_openowner(struct nfs4_openowner *oo)
+{
+ struct nfs4_ol_stateid *stp;
+
+ list_del(&oo->oo_owner.so_strhash);
+ list_del(&oo->oo_perclient);
+ while (!list_empty(&oo->oo_owner.so_stateids)) {
+ stp = list_first_entry(&oo->oo_owner.so_stateids,
+ struct nfs4_ol_stateid, st_perstateowner);
+ release_open_stateid(stp);
+ }
+}
+
+static void release_last_closed_stateid(struct nfs4_openowner *oo)
+{
+ struct nfs4_ol_stateid *s = oo->oo_last_closed_stid;
+
+ if (s) {
+ unhash_stid(&s->st_stid);
+ free_generic_stateid(s);
+ oo->oo_last_closed_stid = NULL;
+ }
+}
+
+static void release_openowner(struct nfs4_openowner *oo)
+{
+ unhash_openowner(oo);
+ list_del(&oo->oo_close_lru);
+ release_last_closed_stateid(oo);
+ nfs4_free_openowner(oo);
+}
+
+#define SESSION_HASH_SIZE 512
+static struct list_head sessionid_hashtbl[SESSION_HASH_SIZE];
+
+static inline int
+hash_sessionid(struct nfs4_sessionid *sessionid)
+{
+ struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid;
+
+ return sid->sequence % SESSION_HASH_SIZE;
+}
+
+#ifdef NFSD_DEBUG
+static inline void
+dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
+{
+ u32 *ptr = (u32 *)(&sessionid->data[0]);
+ dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]);
+}
+#else
+static inline void
+dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
+{
+}
+#endif
+
+
+static void
+gen_sessionid(struct nfsd4_session *ses)
+{
+ struct nfs4_client *clp = ses->se_client;
+ struct nfsd4_sessionid *sid;
+
+ sid = (struct nfsd4_sessionid *)ses->se_sessionid.data;
+ sid->clientid = clp->cl_clientid;
+ sid->sequence = current_sessionid++;
+ sid->reserved = 0;
+}
+
+/*
+ * The protocol defines ca_maxresponssize_cached to include the size of
+ * the rpc header, but all we need to cache is the data starting after
+ * the end of the initial SEQUENCE operation--the rest we regenerate
+ * each time. Therefore we can advertise a ca_maxresponssize_cached
+ * value that is the number of bytes in our cache plus a few additional
+ * bytes. In order to stay on the safe side, and not promise more than
+ * we can cache, those additional bytes must be the minimum possible: 24
+ * bytes of rpc header (xid through accept state, with AUTH_NULL
+ * verifier), 12 for the compound header (with zero-length tag), and 44
+ * for the SEQUENCE op response:
+ */
+#define NFSD_MIN_HDR_SEQ_SZ (24 + 12 + 44)
+
+static void
+free_session_slots(struct nfsd4_session *ses)
+{
+ int i;
+
+ for (i = 0; i < ses->se_fchannel.maxreqs; i++)
+ kfree(ses->se_slots[i]);
+}
+
+/*
+ * We don't actually need to cache the rpc and session headers, so we
+ * can allocate a little less for each slot:
+ */
+static inline int slot_bytes(struct nfsd4_channel_attrs *ca)
+{
+ return ca->maxresp_cached - NFSD_MIN_HDR_SEQ_SZ;
+}
+
+static int nfsd4_sanitize_slot_size(u32 size)
+{
+ size -= NFSD_MIN_HDR_SEQ_SZ; /* We don't cache the rpc header */
+ size = min_t(u32, size, NFSD_SLOT_CACHE_SIZE);
+
+ return size;
+}
+
+/*
+ * XXX: If we run out of reserved DRC memory we could (up to a point)
+ * re-negotiate active sessions and reduce their slot usage to make
+ * room for new connections. For now we just fail the create session.
+ */
+static int nfsd4_get_drc_mem(int slotsize, u32 num)
+{
+ int avail;
+
+ num = min_t(u32, num, NFSD_MAX_SLOTS_PER_SESSION);
+
+ spin_lock(&nfsd_drc_lock);
+ avail = min_t(int, NFSD_MAX_MEM_PER_SESSION,
+ nfsd_drc_max_mem - nfsd_drc_mem_used);
+ num = min_t(int, num, avail / slotsize);
+ nfsd_drc_mem_used += num * slotsize;
+ spin_unlock(&nfsd_drc_lock);
+
+ return num;
+}
+
+static void nfsd4_put_drc_mem(int slotsize, int num)
+{
+ spin_lock(&nfsd_drc_lock);
+ nfsd_drc_mem_used -= slotsize * num;
+ spin_unlock(&nfsd_drc_lock);
+}
+
+static struct nfsd4_session *alloc_session(int slotsize, int numslots)
+{
+ struct nfsd4_session *new;
+ int mem, i;
+
+ BUILD_BUG_ON(NFSD_MAX_SLOTS_PER_SESSION * sizeof(struct nfsd4_slot *)
+ + sizeof(struct nfsd4_session) > PAGE_SIZE);
+ mem = numslots * sizeof(struct nfsd4_slot *);
+
+ new = kzalloc(sizeof(*new) + mem, GFP_KERNEL);
+ if (!new)
+ return NULL;
+ /* allocate each struct nfsd4_slot and data cache in one piece */
+ for (i = 0; i < numslots; i++) {
+ mem = sizeof(struct nfsd4_slot) + slotsize;
+ new->se_slots[i] = kzalloc(mem, GFP_KERNEL);
+ if (!new->se_slots[i])
+ goto out_free;
+ }
+ return new;
+out_free:
+ while (i--)
+ kfree(new->se_slots[i]);
+ kfree(new);
+ return NULL;
+}
+
+static void init_forechannel_attrs(struct nfsd4_channel_attrs *new, struct nfsd4_channel_attrs *req, int numslots, int slotsize)
+{
+ u32 maxrpc = nfsd_serv->sv_max_mesg;
+
+ new->maxreqs = numslots;
+ new->maxresp_cached = min_t(u32, req->maxresp_cached,
+ slotsize + NFSD_MIN_HDR_SEQ_SZ);
+ new->maxreq_sz = min_t(u32, req->maxreq_sz, maxrpc);
+ new->maxresp_sz = min_t(u32, req->maxresp_sz, maxrpc);
+ new->maxops = min_t(u32, req->maxops, NFSD_MAX_OPS_PER_COMPOUND);
+}
+
+static void free_conn(struct nfsd4_conn *c)
+{
+ svc_xprt_put(c->cn_xprt);
+ kfree(c);
+}
+
+static void nfsd4_conn_lost(struct svc_xpt_user *u)
+{
+ struct nfsd4_conn *c = container_of(u, struct nfsd4_conn, cn_xpt_user);
+ struct nfs4_client *clp = c->cn_session->se_client;
+
+ spin_lock(&clp->cl_lock);
+ if (!list_empty(&c->cn_persession)) {
+ list_del(&c->cn_persession);
+ free_conn(c);
+ }
+ spin_unlock(&clp->cl_lock);
+ nfsd4_probe_callback(clp);
+}
+
+static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp, u32 flags)
+{
+ struct nfsd4_conn *conn;
+
+ conn = kmalloc(sizeof(struct nfsd4_conn), GFP_KERNEL);
+ if (!conn)
+ return NULL;
+ svc_xprt_get(rqstp->rq_xprt);
+ conn->cn_xprt = rqstp->rq_xprt;
+ conn->cn_flags = flags;
+ INIT_LIST_HEAD(&conn->cn_xpt_user.list);
+ return conn;
+}
+
+static void __nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
+{
+ conn->cn_session = ses;
+ list_add(&conn->cn_persession, &ses->se_conns);
+}
+
+static void nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
+{
+ struct nfs4_client *clp = ses->se_client;
+
+ spin_lock(&clp->cl_lock);
+ __nfsd4_hash_conn(conn, ses);
+ spin_unlock(&clp->cl_lock);
+}
+
+static int nfsd4_register_conn(struct nfsd4_conn *conn)
+{
+ conn->cn_xpt_user.callback = nfsd4_conn_lost;
+ return register_xpt_user(conn->cn_xprt, &conn->cn_xpt_user);
+}
+
+static __be32 nfsd4_new_conn(struct svc_rqst *rqstp, struct nfsd4_session *ses, u32 dir)
+{
+ struct nfsd4_conn *conn;
+ int ret;
+
+ conn = alloc_conn(rqstp, dir);
+ if (!conn)
+ return nfserr_jukebox;
+ nfsd4_hash_conn(conn, ses);
+ ret = nfsd4_register_conn(conn);
+ if (ret)
+ /* oops; xprt is already down: */
+ nfsd4_conn_lost(&conn->cn_xpt_user);
+ return nfs_ok;
+}
+
+static __be32 nfsd4_new_conn_from_crses(struct svc_rqst *rqstp, struct nfsd4_session *ses)
+{
+ u32 dir = NFS4_CDFC4_FORE;
+
+ if (ses->se_flags & SESSION4_BACK_CHAN)
+ dir |= NFS4_CDFC4_BACK;
+
+ return nfsd4_new_conn(rqstp, ses, dir);
+}
+
+/* must be called under client_lock */
+static void nfsd4_del_conns(struct nfsd4_session *s)
+{
+ struct nfs4_client *clp = s->se_client;
+ struct nfsd4_conn *c;
+
+ spin_lock(&clp->cl_lock);
+ while (!list_empty(&s->se_conns)) {
+ c = list_first_entry(&s->se_conns, struct nfsd4_conn, cn_persession);
+ list_del_init(&c->cn_persession);
+ spin_unlock(&clp->cl_lock);
+
+ unregister_xpt_user(c->cn_xprt, &c->cn_xpt_user);
+ free_conn(c);
+
+ spin_lock(&clp->cl_lock);
+ }
+ spin_unlock(&clp->cl_lock);
+}
+
+static void free_session(struct kref *kref)
+{
+ struct nfsd4_session *ses;
+ int mem;
+
+ lockdep_assert_held(&client_lock);
+ ses = container_of(kref, struct nfsd4_session, se_ref);
+ nfsd4_del_conns(ses);
+ spin_lock(&nfsd_drc_lock);
+ mem = ses->se_fchannel.maxreqs * slot_bytes(&ses->se_fchannel);
+ nfsd_drc_mem_used -= mem;
+ spin_unlock(&nfsd_drc_lock);
+ free_session_slots(ses);
+ kfree(ses);
+}
+
+void nfsd4_put_session(struct nfsd4_session *ses)
+{
+ spin_lock(&client_lock);
+ nfsd4_put_session_locked(ses);
+ spin_unlock(&client_lock);
+}
+
+static struct nfsd4_session *alloc_init_session(struct svc_rqst *rqstp, struct nfs4_client *clp, struct nfsd4_create_session *cses)
+{
+ struct nfsd4_session *new;
+ struct nfsd4_channel_attrs *fchan = &cses->fore_channel;
+ int numslots, slotsize;
+ int status;
+ int idx;
+
+ /*
+ * Note decreasing slot size below client's request may
+ * make it difficult for client to function correctly, whereas
+ * decreasing the number of slots will (just?) affect
+ * performance. When short on memory we therefore prefer to
+ * decrease number of slots instead of their size.
+ */
+ slotsize = nfsd4_sanitize_slot_size(fchan->maxresp_cached);
+ numslots = nfsd4_get_drc_mem(slotsize, fchan->maxreqs);
+ if (numslots < 1)
+ return NULL;
+
+ new = alloc_session(slotsize, numslots);
+ if (!new) {
+ nfsd4_put_drc_mem(slotsize, fchan->maxreqs);
+ return NULL;
+ }
+ init_forechannel_attrs(&new->se_fchannel, fchan, numslots, slotsize);
+
+ new->se_client = clp;
+ gen_sessionid(new);
+
+ INIT_LIST_HEAD(&new->se_conns);
+
+ new->se_cb_seq_nr = 1;
+ new->se_flags = cses->flags;
+ new->se_cb_prog = cses->callback_prog;
+ kref_init(&new->se_ref);
+ idx = hash_sessionid(&new->se_sessionid);
+ spin_lock(&client_lock);
+ list_add(&new->se_hash, &sessionid_hashtbl[idx]);
+ spin_lock(&clp->cl_lock);
+ list_add(&new->se_perclnt, &clp->cl_sessions);
+ spin_unlock(&clp->cl_lock);
+ spin_unlock(&client_lock);
+
+ status = nfsd4_new_conn_from_crses(rqstp, new);
+ /* whoops: benny points out, status is ignored! (err, or bogus) */
+ if (status) {
+ spin_lock(&client_lock);
+ free_session(&new->se_ref);
+ spin_unlock(&client_lock);
+ return NULL;
+ }
+ if (cses->flags & SESSION4_BACK_CHAN) {
+ struct sockaddr *sa = svc_addr(rqstp);
+ /*
+ * This is a little silly; with sessions there's no real
+ * use for the callback address. Use the peer address
+ * as a reasonable default for now, but consider fixing
+ * the rpc client not to require an address in the
+ * future:
+ */
+ rpc_copy_addr((struct sockaddr *)&clp->cl_cb_conn.cb_addr, sa);
+ clp->cl_cb_conn.cb_addrlen = svc_addr_len(sa);
+ }
+ nfsd4_probe_callback(clp);
+ return new;
+}
+
+/* caller must hold client_lock */
+static struct nfsd4_session *
+find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid)
+{
+ struct nfsd4_session *elem;
+ int idx;
+
+ dump_sessionid(__func__, sessionid);
+ idx = hash_sessionid(sessionid);
+ /* Search in the appropriate list */
+ list_for_each_entry(elem, &sessionid_hashtbl[idx], se_hash) {
+ if (!memcmp(elem->se_sessionid.data, sessionid->data,
+ NFS4_MAX_SESSIONID_LEN)) {
+ return elem;
+ }
+ }
+
+ dprintk("%s: session not found\n", __func__);
+ return NULL;
+}
+
+/* caller must hold client_lock */
+static void
+unhash_session(struct nfsd4_session *ses)
+{
+ list_del(&ses->se_hash);
+ spin_lock(&ses->se_client->cl_lock);
+ list_del(&ses->se_perclnt);
+ spin_unlock(&ses->se_client->cl_lock);
+}
+
+/* must be called under the client_lock */
+static inline void
+renew_client_locked(struct nfs4_client *clp)
+{
+ if (is_client_expired(clp)) {
+ dprintk("%s: client (clientid %08x/%08x) already expired\n",
+ __func__,
+ clp->cl_clientid.cl_boot,
+ clp->cl_clientid.cl_id);
+ return;
+ }
+
+ 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();
+}
+
+static inline void
+renew_client(struct nfs4_client *clp)
+{
+ spin_lock(&client_lock);
+ renew_client_locked(clp);
+ spin_unlock(&client_lock);
+}
+
+/* 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) boot_time %08lx\n",
+ clid->cl_boot, clid->cl_id, boot_time);
+ 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 = kmemdup(name.data, name.len, GFP_KERNEL);
+ if (clp->cl_name.data == NULL) {
+ kfree(clp);
+ return NULL;
+ }
+ clp->cl_name.len = name.len;
+ return clp;
+}
+
+static inline void
+free_client(struct nfs4_client *clp)
+{
+ lockdep_assert_held(&client_lock);
+ while (!list_empty(&clp->cl_sessions)) {
+ struct nfsd4_session *ses;
+ ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
+ se_perclnt);
+ list_del(&ses->se_perclnt);
+ nfsd4_put_session_locked(ses);
+ }
+ if (clp->cl_cred.cr_group_info)
+ put_group_info(clp->cl_cred.cr_group_info);
+ kfree(clp->cl_principal);
+ kfree(clp->cl_name.data);
+ idr_remove_all(&clp->cl_stateids);
+ idr_destroy(&clp->cl_stateids);
+ kfree(clp);
+}
+
+void
+release_session_client(struct nfsd4_session *session)
+{
+ struct nfs4_client *clp = session->se_client;
+
+ if (!atomic_dec_and_lock(&clp->cl_refcount, &client_lock))
+ return;
+ if (is_client_expired(clp)) {
+ free_client(clp);
+ session->se_client = NULL;
+ } else
+ renew_client_locked(clp);
+ spin_unlock(&client_lock);
+}
+
+/* must be called under the client_lock */
+static inline void
+unhash_client_locked(struct nfs4_client *clp)
+{
+ struct nfsd4_session *ses;
+
+ mark_client_expired(clp);
+ list_del(&clp->cl_lru);
+ spin_lock(&clp->cl_lock);
+ list_for_each_entry(ses, &clp->cl_sessions, se_perclnt)
+ list_del_init(&ses->se_hash);
+ spin_unlock(&clp->cl_lock);
+}
+
+static void
+expire_client(struct nfs4_client *clp)
+{
+ struct nfs4_openowner *oo;
+ struct nfs4_delegation *dp;
+ struct list_head reaplist;
+
+ 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);
+ 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);
+ unhash_delegation(dp);
+ }
+ while (!list_empty(&clp->cl_openowners)) {
+ oo = list_entry(clp->cl_openowners.next, struct nfs4_openowner, oo_perclient);
+ release_openowner(oo);
+ }
+ nfsd4_shutdown_callback(clp);
+ if (clp->cl_cb_conn.cb_xprt)
+ svc_xprt_put(clp->cl_cb_conn.cb_xprt);
+ list_del(&clp->cl_idhash);
+ list_del(&clp->cl_strhash);
+ spin_lock(&client_lock);
+ unhash_client_locked(clp);
+ if (atomic_read(&clp->cl_refcount) == 0)
+ free_client(clp);
+ spin_unlock(&client_lock);
+}
+
+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)
+{
+ __be32 verf[2];
+ static u32 i;
+
+ verf[0] = (__be32)get_seconds();
+ verf[1] = (__be32)i++;
+ memcpy(clp->cl_confirm.data, verf, sizeof(clp->cl_confirm.data));
+}
+
+static struct nfs4_stid *find_stateid(struct nfs4_client *cl, stateid_t *t)
+{
+ return idr_find(&cl->cl_stateids, t->si_opaque.so_id);
+}
+
+static struct nfs4_stid *find_stateid_by_type(struct nfs4_client *cl, stateid_t *t, char typemask)
+{
+ struct nfs4_stid *s;
+
+ s = find_stateid(cl, t);
+ if (!s)
+ return NULL;
+ if (typemask & s->sc_type)
+ return s;
+ return NULL;
+}
+
+static struct nfs4_client *create_client(struct xdr_netobj name, char *recdir,
+ struct svc_rqst *rqstp, nfs4_verifier *verf)
+{
+ struct nfs4_client *clp;
+ struct sockaddr *sa = svc_addr(rqstp);
+ char *princ;
+
+ clp = alloc_client(name);
+ if (clp == NULL)
+ return NULL;
+
+ INIT_LIST_HEAD(&clp->cl_sessions);
+
+ princ = svc_gss_principal(rqstp);
+ if (princ) {
+ clp->cl_principal = kstrdup(princ, GFP_KERNEL);
+ if (clp->cl_principal == NULL) {
+ spin_lock(&client_lock);
+ free_client(clp);
+ spin_unlock(&client_lock);
+ return NULL;
+ }
+ }
+
+ idr_init(&clp->cl_stateids);
+ memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
+ atomic_set(&clp->cl_refcount, 0);
+ clp->cl_cb_state = NFSD4_CB_UNKNOWN;
+ 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);
+ INIT_LIST_HEAD(&clp->cl_callbacks);
+ spin_lock_init(&clp->cl_lock);
+ INIT_WORK(&clp->cl_cb_null.cb_work, nfsd4_do_callback_rpc);
+ clp->cl_time = get_seconds();
+ clear_bit(0, &clp->cl_cb_slot_busy);
+ rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table");
+ copy_verf(clp, verf);
+ rpc_copy_addr((struct sockaddr *) &clp->cl_addr, sa);
+ clp->cl_flavor = rqstp->rq_flavor;
+ copy_cred(&clp->cl_cred, &rqstp->rq_cred);
+ gen_confirm(clp);
+ clp->cl_cb_session = NULL;
+ return clp;
+}
+
+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]);
+ renew_client(clp);
+}
+
+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_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
+ strhashval = clientstr_hashval(clp->cl_recdir);
+ list_move(&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)) {
+ renew_client(clp);
+ 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 bool clp_used_exchangeid(struct nfs4_client *clp)
+{
+ return clp->cl_exchange_flags != 0;
+}
+
+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;
+}
+
+static void
+gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, struct svc_rqst *rqstp)
+{
+ struct nfs4_cb_conn *conn = &clp->cl_cb_conn;
+ struct sockaddr *sa = svc_addr(rqstp);
+ u32 scopeid = rpc_get_scope_id(sa);
+ unsigned short expected_family;
+
+ /* Currently, we only support tcp and tcp6 for the callback channel */
+ if (se->se_callback_netid_len == 3 &&
+ !memcmp(se->se_callback_netid_val, "tcp", 3))
+ expected_family = AF_INET;
+ else if (se->se_callback_netid_len == 4 &&
+ !memcmp(se->se_callback_netid_val, "tcp6", 4))
+ expected_family = AF_INET6;
+ else
+ goto out_err;
+
+ conn->cb_addrlen = rpc_uaddr2sockaddr(&init_net, se->se_callback_addr_val,
+ se->se_callback_addr_len,
+ (struct sockaddr *)&conn->cb_addr,
+ sizeof(conn->cb_addr));
+
+ if (!conn->cb_addrlen || conn->cb_addr.ss_family != expected_family)
+ goto out_err;
+
+ if (conn->cb_addr.ss_family == AF_INET6)
+ ((struct sockaddr_in6 *)&conn->cb_addr)->sin6_scope_id = scopeid;
+
+ conn->cb_prog = se->se_callback_prog;
+ conn->cb_ident = se->se_callback_ident;
+ memcpy(&conn->cb_saddr, &rqstp->rq_daddr, rqstp->rq_daddrlen);
+ return;
+out_err:
+ conn->cb_addr.ss_family = AF_UNSPEC;
+ conn->cb_addrlen = 0;
+ 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;
+}
+
+/*
+ * Cache a reply. nfsd4_check_drc_limit() has bounded the cache size.
+ */
+void
+nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
+{
+ struct nfsd4_slot *slot = resp->cstate.slot;
+ unsigned int base;
+
+ dprintk("--> %s slot %p\n", __func__, slot);
+
+ slot->sl_opcnt = resp->opcnt;
+ slot->sl_status = resp->cstate.status;
+
+ slot->sl_flags |= NFSD4_SLOT_INITIALIZED;
+ if (nfsd4_not_cached(resp)) {
+ slot->sl_datalen = 0;
+ return;
+ }
+ slot->sl_datalen = (char *)resp->p - (char *)resp->cstate.datap;
+ base = (char *)resp->cstate.datap -
+ (char *)resp->xbuf->head[0].iov_base;
+ if (read_bytes_from_xdr_buf(resp->xbuf, base, slot->sl_data,
+ slot->sl_datalen))
+ WARN("%s: sessions DRC could not cache compound\n", __func__);
+ return;
+}
+
+/*
+ * Encode the replay sequence operation from the slot values.
+ * If cachethis is FALSE encode the uncached rep error on the next
+ * operation which sets resp->p and increments resp->opcnt for
+ * nfs4svc_encode_compoundres.
+ *
+ */
+static __be32
+nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args,
+ struct nfsd4_compoundres *resp)
+{
+ struct nfsd4_op *op;
+ struct nfsd4_slot *slot = resp->cstate.slot;
+
+ /* Encode the replayed sequence operation */
+ op = &args->ops[resp->opcnt - 1];
+ nfsd4_encode_operation(resp, op);
+
+ /* Return nfserr_retry_uncached_rep in next operation. */
+ if (args->opcnt > 1 && !(slot->sl_flags & NFSD4_SLOT_CACHETHIS)) {
+ op = &args->ops[resp->opcnt++];
+ op->status = nfserr_retry_uncached_rep;
+ nfsd4_encode_operation(resp, op);
+ }
+ return op->status;
+}
+
+/*
+ * The sequence operation is not cached because we can use the slot and
+ * session values.
+ */
+__be32
+nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
+ struct nfsd4_sequence *seq)
+{
+ struct nfsd4_slot *slot = resp->cstate.slot;
+ __be32 status;
+
+ dprintk("--> %s slot %p\n", __func__, slot);
+
+ /* Either returns 0 or nfserr_retry_uncached */
+ status = nfsd4_enc_sequence_replay(resp->rqstp->rq_argp, resp);
+ if (status == nfserr_retry_uncached_rep)
+ return status;
+
+ /* The sequence operation has been encoded, cstate->datap set. */
+ memcpy(resp->cstate.datap, slot->sl_data, slot->sl_datalen);
+
+ resp->opcnt = slot->sl_opcnt;
+ resp->p = resp->cstate.datap + XDR_QUADLEN(slot->sl_datalen);
+ status = slot->sl_status;
+
+ return status;
+}
+
+/*
+ * Set the exchange_id flags returned by the server.
+ */
+static void
+nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
+{
+ /* pNFS is not supported */
+ new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
+
+ /* Referrals are supported, Migration is not. */
+ new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
+
+ /* set the wire flags to return to client. */
+ clid->flags = new->cl_exchange_flags;
+}
+
+__be32
+nfsd4_exchange_id(struct svc_rqst *rqstp,
+ struct nfsd4_compound_state *cstate,
+ struct nfsd4_exchange_id *exid)
+{
+ struct nfs4_client *unconf, *conf, *new;
+ int status;
+ unsigned int strhashval;
+ char dname[HEXDIR_LEN];
+ char addr_str[INET6_ADDRSTRLEN];
+ nfs4_verifier verf = exid->verifier;
+ struct sockaddr *sa = svc_addr(rqstp);
+
+ rpc_ntop(sa, addr_str, sizeof(addr_str));
+ dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
+ "ip_addr=%s flags %x, spa_how %d\n",
+ __func__, rqstp, exid, exid->clname.len, exid->clname.data,
+ addr_str, exid->flags, exid->spa_how);
+
+ if (exid->flags & ~EXCHGID4_FLAG_MASK_A)
+ return nfserr_inval;
+
+ /* Currently only support SP4_NONE */
+ switch (exid->spa_how) {
+ case SP4_NONE:
+ break;
+ case SP4_SSV:
+ return nfserr_serverfault;
+ default:
+ BUG(); /* checked by xdr code */
+ case SP4_MACH_CRED:
+ return nfserr_serverfault; /* no excuse :-/ */
+ }
+
+ status = nfs4_make_rec_clidname(dname, &exid->clname);
+
+ if (status)
+ goto error;
+
+ strhashval = clientstr_hashval(dname);
+
+ nfs4_lock_state();
+ status = nfs_ok;
+
+ conf = find_confirmed_client_by_str(dname, strhashval);
+ if (conf) {
+ if (!clp_used_exchangeid(conf)) {
+ status = nfserr_clid_inuse; /* XXX: ? */
+ goto out;
+ }
+ if (!same_verf(&verf, &conf->cl_verifier)) {
+ /* 18.35.4 case 8 */
+ if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {
+ status = nfserr_not_same;
+ goto out;
+ }
+ /* Client reboot: destroy old state */
+ expire_client(conf);
+ goto out_new;
+ }
+ if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
+ /* 18.35.4 case 9 */
+ if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {
+ status = nfserr_perm;
+ goto out;
+ }
+ expire_client(conf);
+ goto out_new;
+ }
+ /*
+ * Set bit when the owner id and verifier map to an already
+ * confirmed client id (18.35.3).
+ */
+ exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
+
+ /*
+ * Falling into 18.35.4 case 2, possible router replay.
+ * Leave confirmed record intact and return same result.
+ */
+ copy_verf(conf, &verf);
+ new = conf;
+ goto out_copy;
+ }
+
+ /* 18.35.4 case 7 */
+ if (exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A) {
+ status = nfserr_noent;
+ goto out;
+ }
+
+ unconf = find_unconfirmed_client_by_str(dname, strhashval);
+ if (unconf) {
+ /*
+ * Possible retry or client restart. Per 18.35.4 case 4,
+ * a new unconfirmed record should be generated regardless
+ * of whether any properties have changed.
+ */
+ expire_client(unconf);
+ }
+
+out_new:
+ /* Normal case */
+ new = create_client(exid->clname, dname, rqstp, &verf);
+ if (new == NULL) {
+ status = nfserr_jukebox;
+ goto out;
+ }
+
+ gen_clid(new);
+ add_to_unconfirmed(new, strhashval);
+out_copy:
+ exid->clientid.cl_boot = new->cl_clientid.cl_boot;
+ exid->clientid.cl_id = new->cl_clientid.cl_id;
+
+ exid->seqid = 1;
+ nfsd4_set_ex_flags(new, exid);
+
+ dprintk("nfsd4_exchange_id seqid %d flags %x\n",
+ new->cl_cs_slot.sl_seqid, new->cl_exchange_flags);
+ status = nfs_ok;
+
+out:
+ nfs4_unlock_state();
+error:
+ dprintk("nfsd4_exchange_id returns %d\n", ntohl(status));
+ return status;
+}
+
+static int
+check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse)
+{
+ dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid,
+ slot_seqid);
+
+ /* The slot is in use, and no response has been sent. */
+ if (slot_inuse) {
+ if (seqid == slot_seqid)
+ return nfserr_jukebox;
+ else
+ return nfserr_seq_misordered;
+ }
+ /* Note unsigned 32-bit arithmetic handles wraparound: */
+ if (likely(seqid == slot_seqid + 1))
+ return nfs_ok;
+ if (seqid == slot_seqid)
+ return nfserr_replay_cache;
+ return nfserr_seq_misordered;
+}
+
+/*
+ * Cache the create session result into the create session single DRC
+ * slot cache by saving the xdr structure. sl_seqid has been set.
+ * Do this for solo or embedded create session operations.
+ */
+static void
+nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses,
+ struct nfsd4_clid_slot *slot, int nfserr)
+{
+ slot->sl_status = nfserr;
+ memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses));
+}
+
+static __be32
+nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses,
+ struct nfsd4_clid_slot *slot)
+{
+ memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses));
+ return slot->sl_status;
+}
+
+#define NFSD_MIN_REQ_HDR_SEQ_SZ ((\
+ 2 * 2 + /* credential,verifier: AUTH_NULL, length 0 */ \
+ 1 + /* MIN tag is length with zero, only length */ \
+ 3 + /* version, opcount, opcode */ \
+ XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
+ /* seqid, slotID, slotID, cache */ \
+ 4 ) * sizeof(__be32))
+
+#define NFSD_MIN_RESP_HDR_SEQ_SZ ((\
+ 2 + /* verifier: AUTH_NULL, length 0 */\
+ 1 + /* status */ \
+ 1 + /* MIN tag is length with zero, only length */ \
+ 3 + /* opcount, opcode, opstatus*/ \
+ XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
+ /* seqid, slotID, slotID, slotID, status */ \
+ 5 ) * sizeof(__be32))
+
+static __be32 check_forechannel_attrs(struct nfsd4_channel_attrs fchannel)
+{
+ return fchannel.maxreq_sz < NFSD_MIN_REQ_HDR_SEQ_SZ
+ || fchannel.maxresp_sz < NFSD_MIN_RESP_HDR_SEQ_SZ;
+}
+
+__be32
+nfsd4_create_session(struct svc_rqst *rqstp,
+ struct nfsd4_compound_state *cstate,
+ struct nfsd4_create_session *cr_ses)
+{
+ struct sockaddr *sa = svc_addr(rqstp);
+ struct nfs4_client *conf, *unconf;
+ struct nfsd4_session *new;
+ struct nfsd4_clid_slot *cs_slot = NULL;
+ bool confirm_me = false;
+ int status = 0;
+
+ if (cr_ses->flags & ~SESSION4_FLAG_MASK_A)
+ return nfserr_inval;
+
+ nfs4_lock_state();
+ unconf = find_unconfirmed_client(&cr_ses->clientid);
+ conf = find_confirmed_client(&cr_ses->clientid);
+
+ if (conf) {
+ cs_slot = &conf->cl_cs_slot;
+ status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
+ if (status == nfserr_replay_cache) {
+ dprintk("Got a create_session replay! seqid= %d\n",
+ cs_slot->sl_seqid);
+ /* Return the cached reply status */
+ status = nfsd4_replay_create_session(cr_ses, cs_slot);
+ goto out;
+ } else if (cr_ses->seqid != cs_slot->sl_seqid + 1) {
+ status = nfserr_seq_misordered;
+ dprintk("Sequence misordered!\n");
+ dprintk("Expected seqid= %d but got seqid= %d\n",
+ cs_slot->sl_seqid, cr_ses->seqid);
+ goto out;
+ }
+ } else if (unconf) {
+ if (!same_creds(&unconf->cl_cred, &rqstp->rq_cred) ||
+ !rpc_cmp_addr(sa, (struct sockaddr *) &unconf->cl_addr)) {
+ status = nfserr_clid_inuse;
+ goto out;
+ }
+
+ cs_slot = &unconf->cl_cs_slot;
+ status = check_slot_seqid(cr_ses->seqid, cs_slot->sl_seqid, 0);
+ if (status) {
+ /* an unconfirmed replay returns misordered */
+ status = nfserr_seq_misordered;
+ goto out;
+ }
+
+ confirm_me = true;
+ conf = unconf;
+ } else {
+ status = nfserr_stale_clientid;
+ goto out;
+ }
+
+ /*
+ * XXX: we should probably set this at creation time, and check
+ * for consistent minorversion use throughout:
+ */
+ conf->cl_minorversion = 1;
+ /*
+ * We do not support RDMA or persistent sessions
+ */
+ cr_ses->flags &= ~SESSION4_PERSIST;
+ cr_ses->flags &= ~SESSION4_RDMA;
+
+ status = nfserr_toosmall;
+ if (check_forechannel_attrs(cr_ses->fore_channel))
+ goto out;
+
+ status = nfserr_jukebox;
+ new = alloc_init_session(rqstp, conf, cr_ses);
+ if (!new)
+ goto out;
+ status = nfs_ok;
+ memcpy(cr_ses->sessionid.data, new->se_sessionid.data,
+ NFS4_MAX_SESSIONID_LEN);
+ memcpy(&cr_ses->fore_channel, &new->se_fchannel,
+ sizeof(struct nfsd4_channel_attrs));
+ cs_slot->sl_seqid++;
+ cr_ses->seqid = cs_slot->sl_seqid;
+
+ /* cache solo and embedded create sessions under the state lock */
+ nfsd4_cache_create_session(cr_ses, cs_slot, status);
+ if (confirm_me)
+ move_to_confirmed(conf);
+out:
+ nfs4_unlock_state();
+ dprintk("%s returns %d\n", __func__, ntohl(status));
+ return status;
+}
+
+static bool nfsd4_last_compound_op(struct svc_rqst *rqstp)
+{
+ struct nfsd4_compoundres *resp = rqstp->rq_resp;
+ struct nfsd4_compoundargs *argp = rqstp->rq_argp;
+
+ return argp->opcnt == resp->opcnt;
+}
+
+static __be32 nfsd4_map_bcts_dir(u32 *dir)
+{
+ switch (*dir) {
+ case NFS4_CDFC4_FORE:
+ case NFS4_CDFC4_BACK:
+ return nfs_ok;
+ case NFS4_CDFC4_FORE_OR_BOTH:
+ case NFS4_CDFC4_BACK_OR_BOTH:
+ *dir = NFS4_CDFC4_BOTH;
+ return nfs_ok;
+ };
+ return nfserr_inval;
+}
+
+__be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp,
+ struct nfsd4_compound_state *cstate,
+ struct nfsd4_bind_conn_to_session *bcts)
+{
+ __be32 status;
+
+ if (!nfsd4_last_compound_op(rqstp))
+ return nfserr_not_only_op;
+ spin_lock(&client_lock);
+ cstate->session = find_in_sessionid_hashtbl(&bcts->sessionid);
+ /* Sorta weird: we only need the refcnt'ing because new_conn acquires
+ * client_lock iself: */
+ if (cstate->session) {
+ nfsd4_get_session(cstate->session);
+ atomic_inc(&cstate->session->se_client->cl_refcount);
+ }
+ spin_unlock(&client_lock);
+ if (!cstate->session)
+ return nfserr_badsession;
+
+ status = nfsd4_map_bcts_dir(&bcts->dir);
+ if (!status)
+ nfsd4_new_conn(rqstp, cstate->session, bcts->dir);
+ return status;
+}
+
+static bool nfsd4_compound_in_session(struct nfsd4_session *session, struct nfs4_sessionid *sid)
+{
+ if (!session)
+ return 0;
+ return !memcmp(sid, &session->se_sessionid, sizeof(*sid));
+}
+
+__be32
+nfsd4_destroy_session(struct svc_rqst *r,
+ struct nfsd4_compound_state *cstate,
+ struct nfsd4_destroy_session *sessionid)
+{
+ struct nfsd4_session *ses;
+ u32 status = nfserr_badsession;
+
+ /* Notes:
+ * - The confirmed nfs4_client->cl_sessionid holds destroyed sessinid
+ * - Should we return nfserr_back_chan_busy if waiting for
+ * callbacks on to-be-destroyed session?
+ * - Do we need to clear any callback info from previous session?
+ */
+
+ if (nfsd4_compound_in_session(cstate->session, &sessionid->sessionid)) {
+ if (!nfsd4_last_compound_op(r))
+ return nfserr_not_only_op;
+ }
+ dump_sessionid(__func__, &sessionid->sessionid);
+ spin_lock(&client_lock);
+ ses = find_in_sessionid_hashtbl(&sessionid->sessionid);
+ if (!ses) {
+ spin_unlock(&client_lock);
+ goto out;
+ }
+
+ unhash_session(ses);
+ spin_unlock(&client_lock);
+
+ nfs4_lock_state();
+ nfsd4_probe_callback_sync(ses->se_client);
+ nfs4_unlock_state();
+
+ spin_lock(&client_lock);
+ nfsd4_del_conns(ses);
+ nfsd4_put_session_locked(ses);
+ spin_unlock(&client_lock);
+ status = nfs_ok;
+out:
+ dprintk("%s returns %d\n", __func__, ntohl(status));
+ return status;
+}
+
+static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_session *s)
+{
+ struct nfsd4_conn *c;
+
+ list_for_each_entry(c, &s->se_conns, cn_persession) {
+ if (c->cn_xprt == xpt) {
+ return c;
+ }
+ }
+ return NULL;
+}
+
+static void nfsd4_sequence_check_conn(struct nfsd4_conn *new, struct nfsd4_session *ses)
+{
+ struct nfs4_client *clp = ses->se_client;
+ struct nfsd4_conn *c;
+ int ret;
+
+ spin_lock(&clp->cl_lock);
+ c = __nfsd4_find_conn(new->cn_xprt, ses);
+ if (c) {
+ spin_unlock(&clp->cl_lock);
+ free_conn(new);
+ return;
+ }
+ __nfsd4_hash_conn(new, ses);
+ spin_unlock(&clp->cl_lock);
+ ret = nfsd4_register_conn(new);
+ if (ret)
+ /* oops; xprt is already down: */
+ nfsd4_conn_lost(&new->cn_xpt_user);
+ return;
+}
+
+static bool nfsd4_session_too_many_ops(struct svc_rqst *rqstp, struct nfsd4_session *session)
+{
+ struct nfsd4_compoundargs *args = rqstp->rq_argp;
+
+ return args->opcnt > session->se_fchannel.maxops;
+}
+
+static bool nfsd4_request_too_big(struct svc_rqst *rqstp,
+ struct nfsd4_session *session)
+{
+ struct xdr_buf *xb = &rqstp->rq_arg;
+
+ return xb->len > session->se_fchannel.maxreq_sz;
+}
+
+__be32
+nfsd4_sequence(struct svc_rqst *rqstp,
+ struct nfsd4_compound_state *cstate,
+ struct nfsd4_sequence *seq)
+{
+ struct nfsd4_compoundres *resp = rqstp->rq_resp;
+ struct nfsd4_session *session;
+ struct nfsd4_slot *slot;
+ struct nfsd4_conn *conn;
+ int status;
+
+ if (resp->opcnt != 1)
+ return nfserr_sequence_pos;
+
+ /*
+ * Will be either used or freed by nfsd4_sequence_check_conn
+ * below.
+ */
+ conn = alloc_conn(rqstp, NFS4_CDFC4_FORE);
+ if (!conn)
+ return nfserr_jukebox;
+
+ spin_lock(&client_lock);
+ status = nfserr_badsession;
+ session = find_in_sessionid_hashtbl(&seq->sessionid);
+ if (!session)
+ goto out;
+
+ status = nfserr_too_many_ops;
+ if (nfsd4_session_too_many_ops(rqstp, session))
+ goto out;
+
+ status = nfserr_req_too_big;
+ if (nfsd4_request_too_big(rqstp, session))
+ goto out;
+
+ status = nfserr_badslot;
+ if (seq->slotid >= session->se_fchannel.maxreqs)
+ goto out;
+
+ slot = session->se_slots[seq->slotid];
+ dprintk("%s: slotid %d\n", __func__, seq->slotid);
+
+ /* We do not negotiate the number of slots yet, so set the
+ * maxslots to the session maxreqs which is used to encode
+ * sr_highest_slotid and the sr_target_slot id to maxslots */
+ seq->maxslots = session->se_fchannel.maxreqs;
+
+ status = check_slot_seqid(seq->seqid, slot->sl_seqid,
+ slot->sl_flags & NFSD4_SLOT_INUSE);
+ if (status == nfserr_replay_cache) {
+ status = nfserr_seq_misordered;
+ if (!(slot->sl_flags & NFSD4_SLOT_INITIALIZED))
+ goto out;
+ cstate->slot = slot;
+ cstate->session = session;
+ /* Return the cached reply status and set cstate->status
+ * for nfsd4_proc_compound processing */
+ status = nfsd4_replay_cache_entry(resp, seq);
+ cstate->status = nfserr_replay_cache;
+ goto out;
+ }
+ if (status)
+ goto out;
+
+ nfsd4_sequence_check_conn(conn, session);
+ conn = NULL;
+
+ /* Success! bump slot seqid */
+ slot->sl_seqid = seq->seqid;
+ slot->sl_flags |= NFSD4_SLOT_INUSE;
+ if (seq->cachethis)
+ slot->sl_flags |= NFSD4_SLOT_CACHETHIS;
+ else
+ slot->sl_flags &= ~NFSD4_SLOT_CACHETHIS;
+
+ cstate->slot = slot;
+ cstate->session = session;
+
+out:
+ /* Hold a session reference until done processing the compound. */
+ if (cstate->session) {
+ struct nfs4_client *clp = session->se_client;
+
+ nfsd4_get_session(cstate->session);
+ atomic_inc(&clp->cl_refcount);
+ switch (clp->cl_cb_state) {
+ case NFSD4_CB_DOWN:
+ seq->status_flags = SEQ4_STATUS_CB_PATH_DOWN;
+ break;
+ case NFSD4_CB_FAULT:
+ seq->status_flags = SEQ4_STATUS_BACKCHANNEL_FAULT;
+ break;
+ default:
+ seq->status_flags = 0;
+ }
+ }
+ kfree(conn);
+ spin_unlock(&client_lock);
+ dprintk("%s: return %d\n", __func__, ntohl(status));
+ return status;
+}
+
+static inline bool has_resources(struct nfs4_client *clp)
+{
+ return !list_empty(&clp->cl_openowners)
+ || !list_empty(&clp->cl_delegations)
+ || !list_empty(&clp->cl_sessions);
+}
+
+__be32
+nfsd4_destroy_clientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_destroy_clientid *dc)
+{
+ struct nfs4_client *conf, *unconf, *clp;
+ int status = 0;
+
+ nfs4_lock_state();
+ unconf = find_unconfirmed_client(&dc->clientid);
+ conf = find_confirmed_client(&dc->clientid);
+
+ if (conf) {
+ clp = conf;
+
+ if (!is_client_expired(conf) && has_resources(conf)) {
+ status = nfserr_clientid_busy;
+ goto out;
+ }
+
+ /* rfc5661 18.50.3 */
+ if (cstate->session && conf == cstate->session->se_client) {
+ status = nfserr_clientid_busy;
+ goto out;
+ }
+ } else if (unconf)
+ clp = unconf;
+ else {
+ status = nfserr_stale_clientid;
+ goto out;
+ }
+
+ expire_client(clp);
+out:
+ nfs4_unlock_state();
+ dprintk("%s return %d\n", __func__, ntohl(status));
+ return status;
+}
+
+__be32
+nfsd4_reclaim_complete(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_reclaim_complete *rc)
+{
+ int status = 0;
+
+ if (rc->rca_one_fs) {
+ if (!cstate->current_fh.fh_dentry)
+ return nfserr_nofilehandle;
+ /*
+ * We don't take advantage of the rca_one_fs case.
+ * That's OK, it's optional, we can safely ignore it.
+ */
+ return nfs_ok;
+ }
+
+ nfs4_lock_state();
+ status = nfserr_complete_already;
+ if (test_and_set_bit(NFSD4_CLIENT_RECLAIM_COMPLETE,
+ &cstate->session->se_client->cl_flags))
+ goto out;
+
+ status = nfserr_stale_clientid;
+ if (is_client_expired(cstate->session->se_client))
+ /*
+ * The following error isn't really legal.
+ * But we only get here if the client just explicitly
+ * destroyed the client. Surely it no longer cares what
+ * error it gets back on an operation for the dead
+ * client.
+ */
+ goto out;
+
+ status = nfs_ok;
+ nfsd4_client_record_create(cstate->session->se_client);
+out:
+ nfs4_unlock_state();
+ return status;
+}
+
+__be32
+nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
+ struct nfsd4_setclientid *setclid)
+{
+ struct xdr_netobj clname = setclid->se_name;
+ nfs4_verifier clverifier = setclid->se_verf;
+ unsigned int strhashval;
+ struct nfs4_client *conf, *unconf, *new;
+ __be32 status;
+ char dname[HEXDIR_LEN];
+
+ 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 (clp_used_exchangeid(conf))
+ goto out;
+ if (!same_creds(&conf->cl_cred, &rqstp->rq_cred)) {
+ char addr_str[INET6_ADDRSTRLEN];
+ rpc_ntop((struct sockaddr *) &conf->cl_addr, addr_str,
+ sizeof(addr_str));
+ dprintk("NFSD: setclientid: string in use by client "
+ "at %s\n", addr_str);
+ 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_jukebox;
+ 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, rqstp, &clverifier);
+ 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, rqstp, &clverifier);
+ 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, rqstp, &clverifier);
+ 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, rqstp, &clverifier);
+ if (new == NULL)
+ goto out;
+ gen_clid(new);
+ }
+ /*
+ * XXX: we should probably set this at creation time, and check
+ * for consistent minorversion use throughout:
+ */
+ new->cl_minorversion = 0;
+ gen_callback(new, setclid, rqstp);
+ 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 *sa = svc_addr(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 && !rpc_cmp_addr((struct sockaddr *) &conf->cl_addr, sa))
+ goto out;
+ if (unconf && !rpc_cmp_addr((struct sockaddr *) &unconf->cl_addr, sa))
+ 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 {
+ nfsd4_change_callback(conf, &unconf->cl_cb_conn);
+ nfsd4_probe_callback(conf);
+ 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_client_record_remove(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;
+}
+
+static struct nfs4_file *nfsd4_alloc_file(void)
+{
+ return kmem_cache_alloc(file_slab, GFP_KERNEL);
+}
+
+/* OPEN Share state helper functions */
+static void nfsd4_init_file(struct nfs4_file *fp, struct inode *ino)
+{
+ unsigned int hashval = file_hashval(ino);
+
+ atomic_set(&fp->fi_ref, 1);
+ INIT_LIST_HEAD(&fp->fi_hash);
+ INIT_LIST_HEAD(&fp->fi_stateids);
+ INIT_LIST_HEAD(&fp->fi_delegations);
+ fp->fi_inode = igrab(ino);
+ fp->fi_had_conflict = false;
+ fp->fi_lease = NULL;
+ memset(fp->fi_fds, 0, sizeof(fp->fi_fds));
+ memset(fp->fi_access, 0, sizeof(fp->fi_access));
+ spin_lock(&recall_lock);
+ list_add(&fp->fi_hash, &file_hashtbl[hashval]);
+ spin_unlock(&recall_lock);
+}
+
+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(&openowner_slab);
+ nfsd4_free_slab(&lockowner_slab);
+ nfsd4_free_slab(&file_slab);
+ nfsd4_free_slab(&stateid_slab);
+ nfsd4_free_slab(&deleg_slab);
+}
+
+int
+nfsd4_init_slabs(void)
+{
+ openowner_slab = kmem_cache_create("nfsd4_openowners",
+ sizeof(struct nfs4_openowner), 0, 0, NULL);
+ if (openowner_slab == NULL)
+ goto out_nomem;
+ lockowner_slab = kmem_cache_create("nfsd4_lockowners",
+ sizeof(struct nfs4_lockowner), 0, 0, NULL);
+ if (lockowner_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_ol_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_openowner(struct nfs4_openowner *oo)
+{
+ kfree(oo->oo_owner.so_owner.data);
+ kmem_cache_free(openowner_slab, oo);
+}
+
+void nfs4_free_lockowner(struct nfs4_lockowner *lo)
+{
+ kfree(lo->lo_owner.so_owner.data);
+ kmem_cache_free(lockowner_slab, lo);
+}
+
+static void init_nfs4_replay(struct nfs4_replay *rp)
+{
+ rp->rp_status = nfserr_serverfault;
+ rp->rp_buflen = 0;
+ rp->rp_buf = rp->rp_ibuf;
+}
+
+static inline void *alloc_stateowner(struct kmem_cache *slab, struct xdr_netobj *owner, struct nfs4_client *clp)
+{
+ struct nfs4_stateowner *sop;
+
+ sop = kmem_cache_alloc(slab, GFP_KERNEL);
+ if (!sop)
+ return NULL;
+
+ sop->so_owner.data = kmemdup(owner->data, owner->len, GFP_KERNEL);
+ if (!sop->so_owner.data) {
+ kmem_cache_free(slab, sop);
+ return NULL;
+ }
+ sop->so_owner.len = owner->len;
+
+ INIT_LIST_HEAD(&sop->so_stateids);
+ sop->so_client = clp;
+ init_nfs4_replay(&sop->so_replay);
+ return sop;
+}
+
+static void hash_openowner(struct nfs4_openowner *oo, struct nfs4_client *clp, unsigned int strhashval)
+{
+ list_add(&oo->oo_owner.so_strhash, &ownerstr_hashtbl[strhashval]);
+ list_add(&oo->oo_perclient, &clp->cl_openowners);
+}
+
+static struct nfs4_openowner *
+alloc_init_open_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfsd4_open *open) {
+ struct nfs4_openowner *oo;
+
+ oo = alloc_stateowner(openowner_slab, &open->op_owner, clp);
+ if (!oo)
+ return NULL;
+ oo->oo_owner.so_is_open_owner = 1;
+ oo->oo_owner.so_seqid = open->op_seqid;
+ oo->oo_flags = NFS4_OO_NEW;
+ oo->oo_time = 0;
+ oo->oo_last_closed_stid = NULL;
+ INIT_LIST_HEAD(&oo->oo_close_lru);
+ hash_openowner(oo, clp, strhashval);
+ return oo;
+}
+
+static void init_open_stateid(struct nfs4_ol_stateid *stp, struct nfs4_file *fp, struct nfsd4_open *open) {
+ struct nfs4_openowner *oo = open->op_openowner;
+ struct nfs4_client *clp = oo->oo_owner.so_client;
+
+ init_stid(&stp->st_stid, clp, NFS4_OPEN_STID);
+ INIT_LIST_HEAD(&stp->st_lockowners);
+ list_add(&stp->st_perstateowner, &oo->oo_owner.so_stateids);
+ list_add(&stp->st_perfile, &fp->fi_stateids);
+ stp->st_stateowner = &oo->oo_owner;
+ get_nfs4_file(fp);
+ stp->st_file = fp;
+ 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
+move_to_close_lru(struct nfs4_openowner *oo)
+{
+ dprintk("NFSD: move_to_close_lru nfs4_openowner %p\n", oo);
+
+ list_move_tail(&oo->oo_close_lru, &close_lru);
+ oo->oo_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_openowner *
+find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open)
+{
+ struct nfs4_stateowner *so;
+ struct nfs4_openowner *oo;
+
+ list_for_each_entry(so, &ownerstr_hashtbl[hashval], so_strhash) {
+ if (!so->so_is_open_owner)
+ continue;
+ if (same_owner_str(so, &open->op_owner, &open->op_clientid)) {
+ oo = openowner(so);
+ renew_client(oo->oo_owner.so_client);
+ return oo;
+ }
+ }
+ 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;
+
+ spin_lock(&recall_lock);
+ list_for_each_entry(fp, &file_hashtbl[hashval], fi_hash) {
+ if (fp->fi_inode == ino) {
+ get_nfs4_file(fp);
+ spin_unlock(&recall_lock);
+ return fp;
+ }
+ }
+ spin_unlock(&recall_lock);
+ return NULL;
+}
+
+/*
+ * 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_ol_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 void nfsd_break_one_deleg(struct nfs4_delegation *dp)
+{
+ /* 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);
+
+ list_add_tail(&dp->dl_recall_lru, &del_recall_lru);
+
+ /* only place dl_time is set. protected by lock_flocks*/
+ dp->dl_time = get_seconds();
+
+ nfsd4_cb_recall(dp);
+}
+
+/* Called from break_lease() with lock_flocks() held. */
+static void nfsd_break_deleg_cb(struct file_lock *fl)
+{
+ struct nfs4_file *fp = (struct nfs4_file *)fl->fl_owner;
+ struct nfs4_delegation *dp;
+
+ BUG_ON(!fp);
+ /* We assume break_lease is only called once per lease: */
+ BUG_ON(fp->fi_had_conflict);
+ /*
+ * We don't want the locks code to timeout the lease for us;
+ * we'll remove it ourself if a delegation isn't returned
+ * in time:
+ */
+ fl->fl_break_time = 0;
+
+ spin_lock(&recall_lock);
+ fp->fi_had_conflict = true;
+ list_for_each_entry(dp, &fp->fi_delegations, dl_perfile)
+ nfsd_break_one_deleg(dp);
+ spin_unlock(&recall_lock);
+}
+
+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 const struct lock_manager_operations nfsd_lease_mng_ops = {
+ .lm_break = nfsd_break_deleg_cb,
+ .lm_change = nfsd_change_deleg_cb,
+};
+
+static __be32 nfsd4_check_seqid(struct nfsd4_compound_state *cstate, struct nfs4_stateowner *so, u32 seqid)
+{
+ if (nfsd4_has_session(cstate))
+ return nfs_ok;
+ if (seqid == so->so_seqid - 1)
+ return nfserr_replay_me;
+ if (seqid == so->so_seqid)
+ return nfs_ok;
+ return nfserr_bad_seqid;
+}
+
+__be32
+nfsd4_process_open1(struct nfsd4_compound_state *cstate,
+ struct nfsd4_open *open)
+{
+ clientid_t *clientid = &open->op_clientid;
+ struct nfs4_client *clp = NULL;
+ unsigned int strhashval;
+ struct nfs4_openowner *oo = NULL;
+ __be32 status;
+
+ if (STALE_CLIENTID(&open->op_clientid))
+ return nfserr_stale_clientid;
+ /*
+ * In case we need it later, after we've already created the
+ * file and don't want to risk a further failure:
+ */
+ open->op_file = nfsd4_alloc_file();
+ if (open->op_file == NULL)
+ return nfserr_jukebox;
+
+ strhashval = ownerstr_hashval(clientid->cl_id, &open->op_owner);
+ oo = find_openstateowner_str(strhashval, open);
+ open->op_openowner = oo;
+ if (!oo) {
+ clp = find_confirmed_client(clientid);
+ if (clp == NULL)
+ return nfserr_expired;
+ goto new_owner;
+ }
+ if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
+ /* Replace unconfirmed owners without checking for replay. */
+ clp = oo->oo_owner.so_client;
+ release_openowner(oo);
+ open->op_openowner = NULL;
+ goto new_owner;
+ }
+ status = nfsd4_check_seqid(cstate, &oo->oo_owner, open->op_seqid);
+ if (status)
+ return status;
+ clp = oo->oo_owner.so_client;
+ goto alloc_stateid;
+new_owner:
+ oo = alloc_init_open_stateowner(strhashval, clp, open);
+ if (oo == NULL)
+ return nfserr_jukebox;
+ open->op_openowner = oo;
+alloc_stateid:
+ open->op_stp = nfs4_alloc_stateid(clp);
+ if (!open->op_stp)
+ return nfserr_jukebox;
+ 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 int share_access_to_flags(u32 share_access)
+{
+ return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE;
+}
+
+static struct nfs4_delegation *find_deleg_stateid(struct nfs4_client *cl, stateid_t *s)
+{
+ struct nfs4_stid *ret;
+
+ ret = find_stateid_by_type(cl, s, NFS4_DELEG_STID);
+ if (!ret)
+ return NULL;
+ return delegstateid(ret);
+}
+
+static bool nfsd4_is_deleg_cur(struct nfsd4_open *open)
+{
+ return open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR ||
+ open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH;
+}
+
+static __be32
+nfs4_check_deleg(struct nfs4_client *cl, struct nfs4_file *fp, struct nfsd4_open *open,
+ struct nfs4_delegation **dp)
+{
+ int flags;
+ __be32 status = nfserr_bad_stateid;
+
+ *dp = find_deleg_stateid(cl, &open->op_delegate_stateid);
+ if (*dp == NULL)
+ goto out;
+ flags = share_access_to_flags(open->op_share_access);
+ status = nfs4_check_delegmode(*dp, flags);
+ if (status)
+ *dp = NULL;
+out:
+ if (!nfsd4_is_deleg_cur(open))
+ return nfs_ok;
+ if (status)
+ return status;
+ open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
+ return nfs_ok;
+}
+
+static __be32
+nfs4_check_open(struct nfs4_file *fp, struct nfsd4_open *open, struct nfs4_ol_stateid **stpp)
+{
+ struct nfs4_ol_stateid *local;
+ struct nfs4_openowner *oo = open->op_openowner;
+
+ 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 == &oo->oo_owner)
+ *stpp = local;
+ /* check for conflicting share reservations */
+ if (!test_share(local, open))
+ return nfserr_share_denied;
+ }
+ return nfs_ok;
+}
+
+static void nfs4_free_stateid(struct nfs4_ol_stateid *s)
+{
+ kmem_cache_free(stateid_slab, s);
+}
+
+static inline int nfs4_access_to_access(u32 nfs4_access)
+{
+ int flags = 0;
+
+ if (nfs4_access & NFS4_SHARE_ACCESS_READ)
+ flags |= NFSD_MAY_READ;
+ if (nfs4_access & NFS4_SHARE_ACCESS_WRITE)
+ flags |= NFSD_MAY_WRITE;
+ return flags;
+}
+
+static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp,
+ struct svc_fh *cur_fh, struct nfsd4_open *open)
+{
+ __be32 status;
+ int oflag = nfs4_access_to_omode(open->op_share_access);
+ int access = nfs4_access_to_access(open->op_share_access);
+
+ if (!fp->fi_fds[oflag]) {
+ status = nfsd_open(rqstp, cur_fh, S_IFREG, access,
+ &fp->fi_fds[oflag]);
+ if (status)
+ return status;
+ }
+ nfs4_file_get_access(fp, oflag);
+
+ return nfs_ok;
+}
+
+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 nfs4_file *fp, struct svc_fh *cur_fh, struct nfs4_ol_stateid *stp, struct nfsd4_open *open)
+{
+ u32 op_share_access = open->op_share_access;
+ bool new_access;
+ __be32 status;
+
+ new_access = !test_bit(op_share_access, &stp->st_access_bmap);
+ if (new_access) {
+ status = nfs4_get_vfs_file(rqstp, fp, cur_fh, open);
+ if (status)
+ return status;
+ }
+ status = nfsd4_truncate(rqstp, cur_fh, open);
+ if (status) {
+ if (new_access) {
+ int oflag = nfs4_access_to_omode(op_share_access);
+ nfs4_file_put_access(fp, oflag);
+ }
+ return status;
+ }
+ /* remember the open */
+ __set_bit(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, bool has_session)
+{
+ open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
+}
+
+/* Should we give out recallable state?: */
+static bool nfsd4_cb_channel_good(struct nfs4_client *clp)
+{
+ if (clp->cl_cb_state == NFSD4_CB_UP)
+ return true;
+ /*
+ * In the sessions case, since we don't have to establish a
+ * separate connection for callbacks, we assume it's OK
+ * until we hear otherwise:
+ */
+ return clp->cl_minorversion && clp->cl_cb_state == NFSD4_CB_UNKNOWN;
+}
+
+static struct file_lock *nfs4_alloc_init_lease(struct nfs4_delegation *dp, int flag)
+{
+ struct file_lock *fl;
+
+ fl = locks_alloc_lock();
+ if (!fl)
+ return NULL;
+ 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->dl_file);
+ fl->fl_pid = current->tgid;
+ return fl;
+}
+
+static int nfs4_setlease(struct nfs4_delegation *dp, int flag)
+{
+ struct nfs4_file *fp = dp->dl_file;
+ struct file_lock *fl;
+ int status;
+
+ fl = nfs4_alloc_init_lease(dp, flag);
+ if (!fl)
+ return -ENOMEM;
+ fl->fl_file = find_readable_file(fp);
+ list_add(&dp->dl_perclnt, &dp->dl_stid.sc_client->cl_delegations);
+ status = vfs_setlease(fl->fl_file, fl->fl_type, &fl);
+ if (status) {
+ list_del_init(&dp->dl_perclnt);
+ locks_free_lock(fl);
+ return -ENOMEM;
+ }
+ fp->fi_lease = fl;
+ fp->fi_deleg_file = fl->fl_file;
+ get_file(fp->fi_deleg_file);
+ atomic_set(&fp->fi_delegees, 1);
+ list_add(&dp->dl_perfile, &fp->fi_delegations);
+ return 0;
+}
+
+static int nfs4_set_delegation(struct nfs4_delegation *dp, int flag)
+{
+ struct nfs4_file *fp = dp->dl_file;
+
+ if (!fp->fi_lease)
+ return nfs4_setlease(dp, flag);
+ spin_lock(&recall_lock);
+ if (fp->fi_had_conflict) {
+ spin_unlock(&recall_lock);
+ return -EAGAIN;
+ }
+ atomic_inc(&fp->fi_delegees);
+ list_add(&dp->dl_perfile, &fp->fi_delegations);
+ spin_unlock(&recall_lock);
+ list_add(&dp->dl_perclnt, &dp->dl_stid.sc_client->cl_delegations);
+ return 0;
+}
+
+static void nfsd4_open_deleg_none_ext(struct nfsd4_open *open, int status)
+{
+ open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
+ if (status == -EAGAIN)
+ open->op_why_no_deleg = WND4_CONTENTION;
+ else {
+ open->op_why_no_deleg = WND4_RESOURCE;
+ switch (open->op_deleg_want) {
+ case NFS4_SHARE_WANT_READ_DELEG:
+ case NFS4_SHARE_WANT_WRITE_DELEG:
+ case NFS4_SHARE_WANT_ANY_DELEG:
+ break;
+ case NFS4_SHARE_WANT_CANCEL:
+ open->op_why_no_deleg = WND4_CANCELLED;
+ break;
+ case NFS4_SHARE_WANT_NO_DELEG:
+ BUG(); /* not supposed to get here */
+ }
+ }
+}
+
+/*
+ * Attempt to hand out a delegation.
+ */
+static void
+nfs4_open_delegation(struct svc_fh *fh, struct nfsd4_open *open, struct nfs4_ol_stateid *stp)
+{
+ struct nfs4_delegation *dp;
+ struct nfs4_openowner *oo = container_of(stp->st_stateowner, struct nfs4_openowner, oo_owner);
+ int cb_up;
+ int status = 0, flag = 0;
+
+ cb_up = nfsd4_cb_channel_good(oo->oo_owner.so_client);
+ flag = NFS4_OPEN_DELEGATE_NONE;
+ open->op_recall = 0;
+ switch (open->op_claim_type) {
+ case NFS4_OPEN_CLAIM_PREVIOUS:
+ if (!cb_up)
+ 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 (!cb_up || !(oo->oo_flags & NFS4_OO_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(oo->oo_owner.so_client, stp, fh, flag);
+ if (dp == NULL)
+ goto out_no_deleg;
+ status = nfs4_set_delegation(dp, flag);
+ if (status)
+ goto out_free;
+
+ memcpy(&open->op_delegate_stateid, &dp->dl_stid.sc_stateid, sizeof(dp->dl_stid.sc_stateid));
+
+ dprintk("NFSD: delegation stateid=" STATEID_FMT "\n",
+ STATEID_VAL(&dp->dl_stid.sc_stateid));
+out:
+ open->op_delegate_type = flag;
+ if (flag == NFS4_OPEN_DELEGATE_NONE) {
+ if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS &&
+ open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE)
+ dprintk("NFSD: WARNING: refusing delegation reclaim\n");
+
+ /* 4.1 client asking for a delegation? */
+ if (open->op_deleg_want)
+ nfsd4_open_deleg_none_ext(open, status);
+ }
+ return;
+out_free:
+ nfs4_put_delegation(dp);
+out_no_deleg:
+ flag = NFS4_OPEN_DELEGATE_NONE;
+ goto out;
+}
+
+static void nfsd4_deleg_xgrade_none_ext(struct nfsd4_open *open,
+ struct nfs4_delegation *dp)
+{
+ if (open->op_deleg_want == NFS4_SHARE_WANT_READ_DELEG &&
+ dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
+ open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
+ open->op_why_no_deleg = WND4_NOT_SUPP_DOWNGRADE;
+ } else if (open->op_deleg_want == NFS4_SHARE_WANT_WRITE_DELEG &&
+ dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
+ open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
+ open->op_why_no_deleg = WND4_NOT_SUPP_UPGRADE;
+ }
+ /* Otherwise the client must be confused wanting a delegation
+ * it already has, therefore we don't return
+ * NFS4_OPEN_DELEGATE_NONE_EXT and reason.
+ */
+}
+
+/*
+ * called with nfs4_lock_state() held.
+ */
+__be32
+nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
+{
+ struct nfsd4_compoundres *resp = rqstp->rq_resp;
+ struct nfs4_client *cl = open->op_openowner->oo_owner.so_client;
+ struct nfs4_file *fp = NULL;
+ struct inode *ino = current_fh->fh_dentry->d_inode;
+ struct nfs4_ol_stateid *stp = NULL;
+ struct nfs4_delegation *dp = NULL;
+ __be32 status;
+
+ /*
+ * 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(cl, fp, open, &dp);
+ if (status)
+ goto out;
+ } else {
+ status = nfserr_bad_stateid;
+ if (nfsd4_is_deleg_cur(open))
+ goto out;
+ status = nfserr_jukebox;
+ fp = open->op_file;
+ open->op_file = NULL;
+ nfsd4_init_file(fp, ino);
+ }
+
+ /*
+ * 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, fp, current_fh, stp, open);
+ if (status)
+ goto out;
+ } else {
+ status = nfs4_get_vfs_file(rqstp, fp, current_fh, open);
+ if (status)
+ goto out;
+ stp = open->op_stp;
+ open->op_stp = NULL;
+ init_open_stateid(stp, fp, open);
+ status = nfsd4_truncate(rqstp, current_fh, open);
+ if (status) {
+ release_open_stateid(stp);
+ goto out;
+ }
+ }
+ update_stateid(&stp->st_stid.sc_stateid);
+ memcpy(&open->op_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
+
+ if (nfsd4_has_session(&resp->cstate)) {
+ open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
+
+ if (open->op_deleg_want & NFS4_SHARE_WANT_NO_DELEG) {
+ open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
+ open->op_why_no_deleg = WND4_NOT_WANTED;
+ goto nodeleg;
+ }
+ }
+
+ /*
+ * Attempt to hand out a delegation. No error return, because the
+ * OPEN succeeds even if we fail.
+ */
+ nfs4_open_delegation(current_fh, open, stp);
+nodeleg:
+ status = nfs_ok;
+
+ dprintk("%s: stateid=" STATEID_FMT "\n", __func__,
+ STATEID_VAL(&stp->st_stid.sc_stateid));
+out:
+ /* 4.1 client trying to upgrade/downgrade delegation? */
+ if (open->op_delegate_type == NFS4_OPEN_DELEGATE_NONE && dp &&
+ open->op_deleg_want)
+ nfsd4_deleg_xgrade_none_ext(open, dp);
+
+ if (fp)
+ put_nfs4_file(fp);
+ if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
+ nfs4_set_claim_prev(open, nfsd4_has_session(&resp->cstate));
+ /*
+ * To finish the open response, we just need to set the rflags.
+ */
+ open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
+ if (!(open->op_openowner->oo_flags & NFS4_OO_CONFIRMED) &&
+ !nfsd4_has_session(&resp->cstate))
+ open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
+
+ return status;
+}
+
+void nfsd4_cleanup_open_state(struct nfsd4_open *open, __be32 status)
+{
+ if (open->op_openowner) {
+ struct nfs4_openowner *oo = open->op_openowner;
+
+ if (!list_empty(&oo->oo_owner.so_stateids))
+ list_del_init(&oo->oo_close_lru);
+ if (oo->oo_flags & NFS4_OO_NEW) {
+ if (status) {
+ release_openowner(oo);
+ open->op_openowner = NULL;
+ } else
+ oo->oo_flags &= ~NFS4_OO_NEW;
+ }
+ }
+ if (open->op_file)
+ nfsd4_free_file(open->op_file);
+ if (open->op_stp)
+ nfs4_free_stateid(open->op_stp);
+}
+
+__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;
+ }
+ status = nfserr_cb_path_down;
+ if (!list_empty(&clp->cl_delegations)
+ && clp->cl_cb_state != NFSD4_CB_UP)
+ goto out;
+ status = nfs_ok;
+out:
+ nfs4_unlock_state();
+ return status;
+}
+
+static struct lock_manager nfsd4_manager = {
+};
+
+static void
+nfsd4_end_grace(void)
+{
+ dprintk("NFSD: end of grace period\n");
+ nfsd4_record_grace_done(&init_net, boot_time);
+ locks_end_grace(&nfsd4_manager);
+ /*
+ * Now that every NFSv4 client has had the chance to recover and
+ * to see the (possibly new, possibly shorter) lease time, we
+ * can safely set the next grace time to the current lease time:
+ */
+ nfsd4_grace = nfsd4_lease;
+}
+
+static time_t
+nfs4_laundromat(void)
+{
+ struct nfs4_client *clp;
+ struct nfs4_openowner *oo;
+ struct nfs4_delegation *dp;
+ struct list_head *pos, *next, reaplist;
+ time_t cutoff = get_seconds() - nfsd4_lease;
+ time_t t, clientid_val = nfsd4_lease;
+ time_t u, test_val = nfsd4_lease;
+
+ nfs4_lock_state();
+
+ dprintk("NFSD: laundromat service - starting\n");
+ if (locks_in_grace())
+ nfsd4_end_grace();
+ INIT_LIST_HEAD(&reaplist);
+ spin_lock(&client_lock);
+ 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;
+ }
+ if (atomic_read(&clp->cl_refcount)) {
+ dprintk("NFSD: client in use (clientid %08x)\n",
+ clp->cl_clientid.cl_id);
+ continue;
+ }
+ unhash_client_locked(clp);
+ list_add(&clp->cl_lru, &reaplist);
+ }
+ spin_unlock(&client_lock);
+ list_for_each_safe(pos, next, &reaplist) {
+ clp = list_entry(pos, struct nfs4_client, cl_lru);
+ dprintk("NFSD: purging unused client (clientid %08x)\n",
+ clp->cl_clientid.cl_id);
+ nfsd4_client_record_remove(clp);
+ expire_client(clp);
+ }
+ 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;
+ }
+ 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);
+ unhash_delegation(dp);
+ }
+ test_val = nfsd4_lease;
+ list_for_each_safe(pos, next, &close_lru) {
+ oo = container_of(pos, struct nfs4_openowner, oo_close_lru);
+ if (time_after((unsigned long)oo->oo_time, (unsigned long)cutoff)) {
+ u = oo->oo_time - cutoff;
+ if (test_val > u)
+ test_val = u;
+ break;
+ }
+ release_openowner(oo);
+ }
+ 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 inline __be32 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_ol_stateid *stp)
+{
+ if (fhp->fh_dentry->d_inode != stp->st_file->fi_inode)
+ return nfserr_bad_stateid;
+ return nfs_ok;
+}
+
+static int
+STALE_STATEID(stateid_t *stateid)
+{
+ if (stateid->si_opaque.so_clid.cl_boot == boot_time)
+ return 0;
+ dprintk("NFSD: stale stateid " STATEID_FMT "!\n",
+ STATEID_VAL(stateid));
+ 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_ol_stateid *stp, int flags)
+{
+ __be32 status = nfserr_openmode;
+
+ /* For lock stateid's, we test the parent open, not the lock: */
+ if (stp->st_openstp)
+ stp = stp->st_openstp;
+ 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)
+{
+ if (ONE_STATEID(stateid) && (flags & RD_STATE))
+ return nfs_ok;
+ else if (locks_in_grace()) {
+ /* Answer in remaining cases depends on existence 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
+grace_disallows_io(struct inode *inode)
+{
+ return locks_in_grace() && mandatory_lock(inode);
+}
+
+/* Returns true iff a is later than b: */
+static bool stateid_generation_after(stateid_t *a, stateid_t *b)
+{
+ return (s32)a->si_generation - (s32)b->si_generation > 0;
+}
+
+static int check_stateid_generation(stateid_t *in, stateid_t *ref, bool has_session)
+{
+ /*
+ * When sessions are used the stateid generation number is ignored
+ * when it is zero.
+ */
+ if (has_session && in->si_generation == 0)
+ return nfs_ok;
+
+ if (in->si_generation == ref->si_generation)
+ return nfs_ok;
+
+ /* If the client sends us a stateid from the future, it's buggy: */
+ if (stateid_generation_after(in, ref))
+ return nfserr_bad_stateid;
+ /*
+ * However, we could see a stateid from the past, even from a
+ * non-buggy client. For example, if the client sends a lock
+ * while some IO is outstanding, the lock may bump si_generation
+ * while the IO is still in flight. The client could avoid that
+ * situation by waiting for responses on all the IO requests,
+ * but better performance may result in retrying IO that
+ * receives an old_stateid error if requests are rarely
+ * reordered in flight:
+ */
+ return nfserr_old_stateid;
+}
+
+static __be32 nfsd4_check_openowner_confirmed(struct nfs4_ol_stateid *ols)
+{
+ if (ols->st_stateowner->so_is_open_owner &&
+ !(openowner(ols->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED))
+ return nfserr_bad_stateid;
+ return nfs_ok;
+}
+
+__be32 nfs4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid)
+{
+ struct nfs4_stid *s;
+ __be32 status;
+
+ if (STALE_STATEID(stateid))
+ return nfserr_stale_stateid;
+
+ s = find_stateid(cl, stateid);
+ if (!s)
+ return nfserr_stale_stateid;
+ status = check_stateid_generation(stateid, &s->sc_stateid, 1);
+ if (status)
+ return status;
+ if (!(s->sc_type & (NFS4_OPEN_STID | NFS4_LOCK_STID)))
+ return nfs_ok;
+ return nfsd4_check_openowner_confirmed(openlockstateid(s));
+}
+
+static __be32 nfsd4_lookup_stateid(stateid_t *stateid, unsigned char typemask, struct nfs4_stid **s)
+{
+ struct nfs4_client *cl;
+
+ if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
+ return nfserr_bad_stateid;
+ if (STALE_STATEID(stateid))
+ return nfserr_stale_stateid;
+ cl = find_confirmed_client(&stateid->si_opaque.so_clid);
+ if (!cl)
+ return nfserr_expired;
+ *s = find_stateid_by_type(cl, stateid, typemask);
+ if (!*s)
+ return nfserr_bad_stateid;
+ return nfs_ok;
+
+}
+
+/*
+* Checks for stateid operations
+*/
+__be32
+nfs4_preprocess_stateid_op(struct nfsd4_compound_state *cstate,
+ stateid_t *stateid, int flags, struct file **filpp)
+{
+ struct nfs4_stid *s;
+ struct nfs4_ol_stateid *stp = NULL;
+ struct nfs4_delegation *dp = NULL;
+ struct svc_fh *current_fh = &cstate->current_fh;
+ struct inode *ino = current_fh->fh_dentry->d_inode;
+ __be32 status;
+
+ if (filpp)
+ *filpp = NULL;
+
+ if (grace_disallows_io(ino))
+ return nfserr_grace;
+
+ if (ZERO_STATEID(stateid) || ONE_STATEID(stateid))
+ return check_special_stateids(current_fh, stateid, flags);
+
+ status = nfsd4_lookup_stateid(stateid, NFS4_DELEG_STID|NFS4_OPEN_STID|NFS4_LOCK_STID, &s);
+ if (status)
+ return status;
+ status = check_stateid_generation(stateid, &s->sc_stateid, nfsd4_has_session(cstate));
+ if (status)
+ goto out;
+ switch (s->sc_type) {
+ case NFS4_DELEG_STID:
+ dp = delegstateid(s);
+ status = nfs4_check_delegmode(dp, flags);
+ if (status)
+ goto out;
+ if (filpp) {
+ *filpp = dp->dl_file->fi_deleg_file;
+ BUG_ON(!*filpp);
+ }
+ break;
+ case NFS4_OPEN_STID:
+ case NFS4_LOCK_STID:
+ stp = openlockstateid(s);
+ status = nfs4_check_fh(current_fh, stp);
+ if (status)
+ goto out;
+ status = nfsd4_check_openowner_confirmed(stp);
+ if (status)
+ goto out;
+ status = nfs4_check_openmode(stp, flags);
+ if (status)
+ goto out;
+ if (filpp) {
+ if (flags & RD_STATE)
+ *filpp = find_readable_file(stp->st_file);
+ else
+ *filpp = find_writeable_file(stp->st_file);
+ }
+ break;
+ default:
+ return nfserr_bad_stateid;
+ }
+ status = nfs_ok;
+out:
+ return status;
+}
+
+static __be32
+nfsd4_free_lock_stateid(struct nfs4_ol_stateid *stp)
+{
+ struct nfs4_lockowner *lo = lockowner(stp->st_stateowner);
+
+ if (check_for_locks(stp->st_file, lo))
+ return nfserr_locks_held;
+ /*
+ * Currently there's a 1-1 lock stateid<->lockowner
+ * correspondance, and we have to delete the lockowner when we
+ * delete the lock stateid:
+ */
+ release_lockowner(lo);
+ return nfs_ok;
+}
+
+/*
+ * Test if the stateid is valid
+ */
+__be32
+nfsd4_test_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
+ struct nfsd4_test_stateid *test_stateid)
+{
+ struct nfsd4_test_stateid_id *stateid;
+ struct nfs4_client *cl = cstate->session->se_client;
+
+ nfs4_lock_state();
+ list_for_each_entry(stateid, &test_stateid->ts_stateid_list, ts_id_list)
+ stateid->ts_id_status = nfs4_validate_stateid(cl, &stateid->ts_id_stateid);
+ nfs4_unlock_state();
+
+ return nfs_ok;
+}
+
+__be32
+nfsd4_free_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
+ struct nfsd4_free_stateid *free_stateid)
+{
+ stateid_t *stateid = &free_stateid->fr_stateid;
+ struct nfs4_stid *s;
+ struct nfs4_client *cl = cstate->session->se_client;
+ __be32 ret = nfserr_bad_stateid;
+
+ nfs4_lock_state();
+ s = find_stateid(cl, stateid);
+ if (!s)
+ goto out;
+ switch (s->sc_type) {
+ case NFS4_DELEG_STID:
+ ret = nfserr_locks_held;
+ goto out;
+ case NFS4_OPEN_STID:
+ case NFS4_LOCK_STID:
+ ret = check_stateid_generation(stateid, &s->sc_stateid, 1);
+ if (ret)
+ goto out;
+ if (s->sc_type == NFS4_LOCK_STID)
+ ret = nfsd4_free_lock_stateid(openlockstateid(s));
+ else
+ ret = nfserr_locks_held;
+ break;
+ default:
+ ret = nfserr_bad_stateid;
+ }
+out:
+ nfs4_unlock_state();
+ return ret;
+}
+
+static inline int
+setlkflg (int type)
+{
+ return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
+ RD_STATE : WR_STATE;
+}
+
+static __be32 nfs4_seqid_op_checks(struct nfsd4_compound_state *cstate, stateid_t *stateid, u32 seqid, struct nfs4_ol_stateid *stp)
+{
+ struct svc_fh *current_fh = &cstate->current_fh;
+ struct nfs4_stateowner *sop = stp->st_stateowner;
+ __be32 status;
+
+ status = nfsd4_check_seqid(cstate, sop, seqid);
+ if (status)
+ return status;
+ if (stp->st_stid.sc_type == NFS4_CLOSED_STID)
+ /*
+ * "Closed" stateid's exist *only* to return
+ * nfserr_replay_me from the previous step.
+ */
+ return nfserr_bad_stateid;
+ status = check_stateid_generation(stateid, &stp->st_stid.sc_stateid, nfsd4_has_session(cstate));
+ if (status)
+ return status;
+ return nfs4_check_fh(current_fh, stp);
+}
+
+/*
+ * Checks for sequence id mutating operations.
+ */
+static __be32
+nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
+ stateid_t *stateid, char typemask,
+ struct nfs4_ol_stateid **stpp)
+{
+ __be32 status;
+ struct nfs4_stid *s;
+
+ dprintk("NFSD: %s: seqid=%d stateid = " STATEID_FMT "\n", __func__,
+ seqid, STATEID_VAL(stateid));
+
+ *stpp = NULL;
+ status = nfsd4_lookup_stateid(stateid, typemask, &s);
+ if (status)
+ return status;
+ *stpp = openlockstateid(s);
+ cstate->replay_owner = (*stpp)->st_stateowner;
+
+ return nfs4_seqid_op_checks(cstate, stateid, seqid, *stpp);
+}
+
+static __be32 nfs4_preprocess_confirmed_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid, stateid_t *stateid, struct nfs4_ol_stateid **stpp)
+{
+ __be32 status;
+ struct nfs4_openowner *oo;
+
+ status = nfs4_preprocess_seqid_op(cstate, seqid, stateid,
+ NFS4_OPEN_STID, stpp);
+ if (status)
+ return status;
+ oo = openowner((*stpp)->st_stateowner);
+ if (!(oo->oo_flags & NFS4_OO_CONFIRMED))
+ return nfserr_bad_stateid;
+ return nfs_ok;
+}
+
+__be32
+nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
+ struct nfsd4_open_confirm *oc)
+{
+ __be32 status;
+ struct nfs4_openowner *oo;
+ struct nfs4_ol_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();
+
+ status = nfs4_preprocess_seqid_op(cstate,
+ oc->oc_seqid, &oc->oc_req_stateid,
+ NFS4_OPEN_STID, &stp);
+ if (status)
+ goto out;
+ oo = openowner(stp->st_stateowner);
+ status = nfserr_bad_stateid;
+ if (oo->oo_flags & NFS4_OO_CONFIRMED)
+ goto out;
+ oo->oo_flags |= NFS4_OO_CONFIRMED;
+ update_stateid(&stp->st_stid.sc_stateid);
+ memcpy(&oc->oc_resp_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
+ dprintk("NFSD: %s: success, seqid=%d stateid=" STATEID_FMT "\n",
+ __func__, oc->oc_seqid, STATEID_VAL(&stp->st_stid.sc_stateid));
+
+ nfsd4_client_record_create(oo->oo_owner.so_client);
+ status = nfs_ok;
+out:
+ if (!cstate->replay_owner)
+ nfs4_unlock_state();
+ return status;
+}
+
+static inline void nfs4_stateid_downgrade_bit(struct nfs4_ol_stateid *stp, u32 access)
+{
+ if (!test_bit(access, &stp->st_access_bmap))
+ return;
+ nfs4_file_put_access(stp->st_file, nfs4_access_to_omode(access));
+ __clear_bit(access, &stp->st_access_bmap);
+}
+
+static inline void nfs4_stateid_downgrade(struct nfs4_ol_stateid *stp, u32 to_access)
+{
+ switch (to_access) {
+ case NFS4_SHARE_ACCESS_READ:
+ nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_WRITE);
+ nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
+ break;
+ case NFS4_SHARE_ACCESS_WRITE:
+ nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_READ);
+ nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
+ break;
+ case NFS4_SHARE_ACCESS_BOTH:
+ break;
+ default:
+ BUG();
+ }
+}
+
+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_ol_stateid *stp;
+
+ 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);
+
+ /* We don't yet support WANT bits: */
+ if (od->od_deleg_want)
+ dprintk("NFSD: %s: od_deleg_want=0x%x ignored\n", __func__,
+ od->od_deleg_want);
+
+ nfs4_lock_state();
+ status = nfs4_preprocess_confirmed_seqid_op(cstate, od->od_seqid,
+ &od->od_stateid, &stp);
+ if (status)
+ 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;
+ }
+ nfs4_stateid_downgrade(stp, od->od_share_access);
+
+ reset_union_bmap_deny(od->od_share_deny, &stp->st_deny_bmap);
+
+ update_stateid(&stp->st_stid.sc_stateid);
+ memcpy(&od->od_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
+ status = nfs_ok;
+out:
+ if (!cstate->replay_owner)
+ nfs4_unlock_state();
+ return status;
+}
+
+void nfsd4_purge_closed_stateid(struct nfs4_stateowner *so)
+{
+ struct nfs4_openowner *oo;
+ struct nfs4_ol_stateid *s;
+
+ if (!so->so_is_open_owner)
+ return;
+ oo = openowner(so);
+ s = oo->oo_last_closed_stid;
+ if (!s)
+ return;
+ if (!(oo->oo_flags & NFS4_OO_PURGE_CLOSE)) {
+ /* Release the last_closed_stid on the next seqid bump: */
+ oo->oo_flags |= NFS4_OO_PURGE_CLOSE;
+ return;
+ }
+ oo->oo_flags &= ~NFS4_OO_PURGE_CLOSE;
+ release_last_closed_stateid(oo);
+}
+
+static void nfsd4_close_open_stateid(struct nfs4_ol_stateid *s)
+{
+ unhash_open_stateid(s);
+ s->st_stid.sc_type = NFS4_CLOSED_STID;
+}
+
+/*
+ * 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_openowner *oo;
+ struct nfs4_ol_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();
+ status = nfs4_preprocess_seqid_op(cstate, close->cl_seqid,
+ &close->cl_stateid,
+ NFS4_OPEN_STID|NFS4_CLOSED_STID,
+ &stp);
+ if (status)
+ goto out;
+ oo = openowner(stp->st_stateowner);
+ status = nfs_ok;
+ update_stateid(&stp->st_stid.sc_stateid);
+ memcpy(&close->cl_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
+
+ nfsd4_close_open_stateid(stp);
+ release_last_closed_stateid(oo);
+ oo->oo_last_closed_stid = stp;
+
+ /* 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(&oo->oo_owner.so_stateids))
+ move_to_close_lru(oo);
+out:
+ if (!cstate->replay_owner)
+ nfs4_unlock_state();
+ return status;
+}
+
+__be32
+nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
+ struct nfsd4_delegreturn *dr)
+{
+ struct nfs4_delegation *dp;
+ stateid_t *stateid = &dr->dr_stateid;
+ struct nfs4_stid *s;
+ struct inode *inode;
+ __be32 status;
+
+ if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
+ return status;
+ inode = cstate->current_fh.fh_dentry->d_inode;
+
+ nfs4_lock_state();
+ status = nfsd4_lookup_stateid(stateid, NFS4_DELEG_STID, &s);
+ if (status)
+ goto out;
+ dp = delegstateid(s);
+ status = check_stateid_generation(stateid, &dp->dl_stid.sc_stateid, nfsd4_has_session(cstate));
+ if (status)
+ goto out;
+
+ unhash_delegation(dp);
+out:
+ nfs4_unlock_state();
+
+ return status;
+}
+
+
+#define LOFF_OVERFLOW(start, len) ((u64)(len) > ~(u64)(start))
+
+#define LOCKOWNER_INO_HASH_BITS 8
+#define LOCKOWNER_INO_HASH_SIZE (1 << LOCKOWNER_INO_HASH_BITS)
+#define LOCKOWNER_INO_HASH_MASK (LOCKOWNER_INO_HASH_SIZE - 1)
+
+static inline u64
+end_offset(u64 start, u64 len)
+{
+ u64 end;
+
+ end = start + len;
+ return end >= start ? end: NFS4_MAX_UINT64;
+}
+
+/* last octet in a range */
+static inline u64
+last_byte_offset(u64 start, u64 len)
+{
+ u64 end;
+
+ BUG_ON(!len);
+ end = start + len;
+ return end > start ? end - 1: NFS4_MAX_UINT64;
+}
+
+static unsigned int lockowner_ino_hashval(struct inode *inode, u32 cl_id, struct xdr_netobj *ownername)
+{
+ return (file_hashval(inode) + cl_id
+ + opaque_hashval(ownername->data, ownername->len))
+ & LOCKOWNER_INO_HASH_MASK;
+}
+
+static struct list_head lockowner_ino_hashtbl[LOCKOWNER_INO_HASH_SIZE];
+
+/*
+ * 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 const 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_lockowner *lo;
+
+ if (fl->fl_lmops == &nfsd_posix_mng_ops) {
+ lo = (struct nfs4_lockowner *) fl->fl_owner;
+ deny->ld_owner.data = kmemdup(lo->lo_owner.so_owner.data,
+ lo->lo_owner.so_owner.len, GFP_KERNEL);
+ if (!deny->ld_owner.data)
+ /* We just don't care that much */
+ goto nevermind;
+ deny->ld_owner.len = lo->lo_owner.so_owner.len;
+ deny->ld_clientid = lo->lo_owner.so_client->cl_clientid;
+ } else {
+nevermind:
+ deny->ld_owner.len = 0;
+ deny->ld_owner.data = NULL;
+ deny->ld_clientid.cl_boot = 0;
+ deny->ld_clientid.cl_id = 0;
+ }
+ deny->ld_start = fl->fl_start;
+ deny->ld_length = NFS4_MAX_UINT64;
+ if (fl->fl_end != NFS4_MAX_UINT64)
+ 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 bool same_lockowner_ino(struct nfs4_lockowner *lo, struct inode *inode, clientid_t *clid, struct xdr_netobj *owner)
+{
+ struct nfs4_ol_stateid *lst;
+
+ if (!same_owner_str(&lo->lo_owner, owner, clid))
+ return false;
+ if (list_empty(&lo->lo_owner.so_stateids)) {
+ WARN_ON_ONCE(1);
+ return false;
+ }
+ lst = list_first_entry(&lo->lo_owner.so_stateids,
+ struct nfs4_ol_stateid, st_perstateowner);
+ return lst->st_file->fi_inode == inode;
+}
+
+static struct nfs4_lockowner *
+find_lockowner_str(struct inode *inode, clientid_t *clid,
+ struct xdr_netobj *owner)
+{
+ unsigned int hashval = lockowner_ino_hashval(inode, clid->cl_id, owner);
+ struct nfs4_lockowner *lo;
+
+ list_for_each_entry(lo, &lockowner_ino_hashtbl[hashval], lo_owner_ino_hash) {
+ if (same_lockowner_ino(lo, inode, clid, owner))
+ return lo;
+ }
+ return NULL;
+}
+
+static void hash_lockowner(struct nfs4_lockowner *lo, unsigned int strhashval, struct nfs4_client *clp, struct nfs4_ol_stateid *open_stp)
+{
+ struct inode *inode = open_stp->st_file->fi_inode;
+ unsigned int inohash = lockowner_ino_hashval(inode,
+ clp->cl_clientid.cl_id, &lo->lo_owner.so_owner);
+
+ list_add(&lo->lo_owner.so_strhash, &ownerstr_hashtbl[strhashval]);
+ list_add(&lo->lo_owner_ino_hash, &lockowner_ino_hashtbl[inohash]);
+ list_add(&lo->lo_perstateid, &open_stp->st_lockowners);
+}
+
+/*
+ * Alloc a lock owner structure.
+ * Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
+ * occurred.
+ *
+ * strhashval = ownerstr_hashval
+ */
+
+static struct nfs4_lockowner *
+alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, struct nfs4_ol_stateid *open_stp, struct nfsd4_lock *lock) {
+ struct nfs4_lockowner *lo;
+
+ lo = alloc_stateowner(lockowner_slab, &lock->lk_new_owner, clp);
+ if (!lo)
+ return NULL;
+ INIT_LIST_HEAD(&lo->lo_owner.so_stateids);
+ lo->lo_owner.so_is_open_owner = 0;
+ /* It is the openowner seqid that will be incremented in encode in the
+ * case of new lockowners; so increment the lock seqid manually: */
+ lo->lo_owner.so_seqid = lock->lk_new_lock_seqid + 1;
+ hash_lockowner(lo, strhashval, clp, open_stp);
+ return lo;
+}
+
+static struct nfs4_ol_stateid *
+alloc_init_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fp, struct nfs4_ol_stateid *open_stp)
+{
+ struct nfs4_ol_stateid *stp;
+ struct nfs4_client *clp = lo->lo_owner.so_client;
+
+ stp = nfs4_alloc_stateid(clp);
+ if (stp == NULL)
+ return NULL;
+ init_stid(&stp->st_stid, clp, NFS4_LOCK_STID);
+ list_add(&stp->st_perfile, &fp->fi_stateids);
+ list_add(&stp->st_perstateowner, &lo->lo_owner.so_stateids);
+ stp->st_stateowner = &lo->lo_owner;
+ get_nfs4_file(fp);
+ stp->st_file = fp;
+ stp->st_access_bmap = 0;
+ stp->st_deny_bmap = open_stp->st_deny_bmap;
+ stp->st_openstp = open_stp;
+ return stp;
+}
+
+static int
+check_lock_length(u64 offset, u64 length)
+{
+ return ((length == 0) || ((length != NFS4_MAX_UINT64) &&
+ LOFF_OVERFLOW(offset, length)));
+}
+
+static void get_lock_access(struct nfs4_ol_stateid *lock_stp, u32 access)
+{
+ struct nfs4_file *fp = lock_stp->st_file;
+ int oflag = nfs4_access_to_omode(access);
+
+ if (test_bit(access, &lock_stp->st_access_bmap))
+ return;
+ nfs4_file_get_access(fp, oflag);
+ __set_bit(access, &lock_stp->st_access_bmap);
+}
+
+__be32 lookup_or_create_lock_state(struct nfsd4_compound_state *cstate, struct nfs4_ol_stateid *ost, struct nfsd4_lock *lock, struct nfs4_ol_stateid **lst, bool *new)
+{
+ struct nfs4_file *fi = ost->st_file;
+ struct nfs4_openowner *oo = openowner(ost->st_stateowner);
+ struct nfs4_client *cl = oo->oo_owner.so_client;
+ struct nfs4_lockowner *lo;
+ unsigned int strhashval;
+
+ lo = find_lockowner_str(fi->fi_inode, &cl->cl_clientid, &lock->v.new.owner);
+ if (lo) {
+ if (!cstate->minorversion)
+ return nfserr_bad_seqid;
+ /* XXX: a lockowner always has exactly one stateid: */
+ *lst = list_first_entry(&lo->lo_owner.so_stateids,
+ struct nfs4_ol_stateid, st_perstateowner);
+ return nfs_ok;
+ }
+ strhashval = ownerstr_hashval(cl->cl_clientid.cl_id,
+ &lock->v.new.owner);
+ lo = alloc_init_lock_stateowner(strhashval, cl, ost, lock);
+ if (lo == NULL)
+ return nfserr_jukebox;
+ *lst = alloc_init_lock_stateid(lo, fi, ost);
+ if (*lst == NULL) {
+ release_lockowner(lo);
+ return nfserr_jukebox;
+ }
+ *new = true;
+ return nfs_ok;
+}
+
+/*
+ * LOCK operation
+ */
+__be32
+nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
+ struct nfsd4_lock *lock)
+{
+ struct nfs4_openowner *open_sop = NULL;
+ struct nfs4_lockowner *lock_sop = NULL;
+ struct nfs4_ol_stateid *lock_stp;
+ struct nfs4_file *fp;
+ struct file *filp = NULL;
+ struct file_lock file_lock;
+ struct file_lock conflock;
+ __be32 status = 0;
+ bool new_state = false;
+ int lkflg;
+ 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_ol_stateid *open_stp = NULL;
+
+ if (nfsd4_has_session(cstate))
+ /* See rfc 5661 18.10.3: given clientid is ignored: */
+ memcpy(&lock->v.new.clientid,
+ &cstate->session->se_client->cl_clientid,
+ sizeof(clientid_t));
+
+ status = nfserr_stale_clientid;
+ if (STALE_CLIENTID(&lock->lk_new_clientid))
+ goto out;
+
+ /* validate and update open stateid and open seqid */
+ status = nfs4_preprocess_confirmed_seqid_op(cstate,
+ lock->lk_new_open_seqid,
+ &lock->lk_new_open_stateid,
+ &open_stp);
+ if (status)
+ goto out;
+ open_sop = openowner(open_stp->st_stateowner);
+ status = nfserr_bad_stateid;
+ if (!same_clid(&open_sop->oo_owner.so_client->cl_clientid,
+ &lock->v.new.clientid))
+ goto out;
+ status = lookup_or_create_lock_state(cstate, open_stp, lock,
+ &lock_stp, &new_state);
+ if (status)
+ goto out;
+ } else {
+ /* lock (lock owner + lock stateid) already exists */
+ status = nfs4_preprocess_seqid_op(cstate,
+ lock->lk_old_lock_seqid,
+ &lock->lk_old_lock_stateid,
+ NFS4_LOCK_STID, &lock_stp);
+ if (status)
+ goto out;
+ }
+ lock_sop = lockowner(lock_stp->st_stateowner);
+ fp = lock_stp->st_file;
+
+ lkflg = setlkflg(lock->lk_type);
+ status = nfs4_check_openmode(lock_stp, lkflg);
+ if (status)
+ goto out;
+
+ 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:
+ filp = find_readable_file(lock_stp->st_file);
+ if (filp)
+ get_lock_access(lock_stp, NFS4_SHARE_ACCESS_READ);
+ file_lock.fl_type = F_RDLCK;
+ break;
+ case NFS4_WRITE_LT:
+ case NFS4_WRITEW_LT:
+ filp = find_writeable_file(lock_stp->st_file);
+ if (filp)
+ get_lock_access(lock_stp, NFS4_SHARE_ACCESS_WRITE);
+ file_lock.fl_type = F_WRLCK;
+ break;
+ default:
+ status = nfserr_inval;
+ goto out;
+ }
+ if (!filp) {
+ status = nfserr_openmode;
+ 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;
+ file_lock.fl_end = last_byte_offset(lock->lk_offset, lock->lk_length);
+ 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, F_SETLK, &file_lock, &conflock);
+ switch (-err) {
+ case 0: /* success! */
+ update_stateid(&lock_stp->st_stid.sc_stateid);
+ memcpy(&lock->lk_resp_stateid, &lock_stp->st_stid.sc_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 = nfserrno(err);
+ break;
+ }
+out:
+ if (status && new_state)
+ release_lockowner(lock_sop);
+ if (!cstate->replay_owner)
+ nfs4_unlock_state();
+ return status;
+}
+
+/*
+ * The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
+ * so we do a temporary open here just to get an open file to pass to
+ * vfs_test_lock. (Arguably perhaps test_lock should be done with an
+ * inode operation.)
+ */
+static __be32 nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
+{
+ struct file *file;
+ __be32 err = nfsd_open(rqstp, fhp, S_IFREG, NFSD_MAY_READ, &file);
+ if (!err) {
+ err = nfserrno(vfs_test_lock(file, lock));
+ nfsd_close(file);
+ }
+ return err;
+}
+
+/*
+ * LOCKT operation
+ */
+__be32
+nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
+ struct nfsd4_lockt *lockt)
+{
+ struct inode *inode;
+ struct file_lock file_lock;
+ struct nfs4_lockowner *lo;
+ __be32 status;
+
+ if (locks_in_grace())
+ return nfserr_grace;
+
+ if (check_lock_length(lockt->lt_offset, lockt->lt_length))
+ return nfserr_inval;
+
+ nfs4_lock_state();
+
+ status = nfserr_stale_clientid;
+ if (!nfsd4_has_session(cstate) && STALE_CLIENTID(&lockt->lt_clientid))
+ goto out;
+
+ if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
+ 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;
+ }
+
+ lo = find_lockowner_str(inode, &lockt->lt_clientid, &lockt->lt_owner);
+ if (lo)
+ file_lock.fl_owner = (fl_owner_t)lo;
+ file_lock.fl_pid = current->tgid;
+ file_lock.fl_flags = FL_POSIX;
+
+ file_lock.fl_start = lockt->lt_offset;
+ file_lock.fl_end = last_byte_offset(lockt->lt_offset, lockt->lt_length);
+
+ nfs4_transform_lock_offset(&file_lock);
+
+ status = nfsd_test_lock(rqstp, &cstate->current_fh, &file_lock);
+ if (status)
+ 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_ol_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();
+
+ status = nfs4_preprocess_seqid_op(cstate, locku->lu_seqid,
+ &locku->lu_stateid, NFS4_LOCK_STID, &stp);
+ if (status)
+ goto out;
+ filp = find_any_file(stp->st_file);
+ if (!filp) {
+ status = nfserr_lock_range;
+ goto out;
+ }
+ BUG_ON(!filp);
+ locks_init_lock(&file_lock);
+ file_lock.fl_type = F_UNLCK;
+ file_lock.fl_owner = (fl_owner_t)lockowner(stp->st_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;
+
+ file_lock.fl_end = last_byte_offset(locku->lu_offset, locku->lu_length);
+ 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_stid.sc_stateid);
+ memcpy(&locku->lu_stateid, &stp->st_stid.sc_stateid, sizeof(stateid_t));
+
+out:
+ if (!cstate->replay_owner)
+ 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 nfs4_file *filp, struct nfs4_lockowner *lowner)
+{
+ struct file_lock **flpp;
+ struct inode *inode = filp->fi_inode;
+ int status = 0;
+
+ lock_flocks();
+ 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_flocks();
+ 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_lockowner *lo;
+ struct nfs4_ol_stateid *stp;
+ struct xdr_netobj *owner = &rlockowner->rl_owner;
+ struct list_head matches;
+ unsigned int hashval = ownerstr_hashval(clid->cl_id, owner);
+ __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;
+ INIT_LIST_HEAD(&matches);
+
+ list_for_each_entry(sop, &ownerstr_hashtbl[hashval], so_strhash) {
+ if (sop->so_is_open_owner)
+ continue;
+ if (!same_owner_str(sop, owner, clid))
+ continue;
+ list_for_each_entry(stp, &sop->so_stateids,
+ st_perstateowner) {
+ lo = lockowner(sop);
+ if (check_for_locks(stp->st_file, lo))
+ goto out;
+ list_add(&lo->lo_list, &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)) {
+ lo = list_entry(matches.next, struct nfs4_lockowner,
+ lo_list);
+ /* unhash_stateowner deletes so_perclient only
+ * for openowners. */
+ list_del(&lo->lo_list);
+ release_lockowner(lo);
+ }
+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, bool use_exchange_id)
+{
+ unsigned int strhashval = clientstr_hashval(name);
+ struct nfs4_client *clp;
+
+ clp = find_confirmed_client_by_str(name, strhashval);
+ if (!clp)
+ return 0;
+ return test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags);
+}
+
+/*
+ * 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;
+}
+
+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. */
+struct nfs4_client_reclaim *
+nfsd4_find_reclaim_client(struct nfs4_client *clp)
+{
+ unsigned int strhashval;
+ struct nfs4_client_reclaim *crp = 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)
+{
+ struct nfs4_client *clp;
+
+ /* find clientid in conf_id_hashtbl */
+ clp = find_confirmed_client(clid);
+ if (clp == NULL)
+ return nfserr_reclaim_bad;
+
+ return nfsd4_client_record_check(clp) ? nfserr_reclaim_bad : nfs_ok;
+}
+
+#ifdef CONFIG_NFSD_FAULT_INJECTION
+
+void nfsd_forget_clients(u64 num)
+{
+ struct nfs4_client *clp, *next;
+ int count = 0;
+
+ nfs4_lock_state();
+ list_for_each_entry_safe(clp, next, &client_lru, cl_lru) {
+ nfsd4_client_record_remove(clp);
+ expire_client(clp);
+ if (++count == num)
+ break;
+ }
+ nfs4_unlock_state();
+
+ printk(KERN_INFO "NFSD: Forgot %d clients", count);
+}
+
+static void release_lockowner_sop(struct nfs4_stateowner *sop)
+{
+ release_lockowner(lockowner(sop));
+}
+
+static void release_openowner_sop(struct nfs4_stateowner *sop)
+{
+ release_openowner(openowner(sop));
+}
+
+static int nfsd_release_n_owners(u64 num, bool is_open_owner,
+ void (*release_sop)(struct nfs4_stateowner *))
+{
+ int i, count = 0;
+ struct nfs4_stateowner *sop, *next;
+
+ for (i = 0; i < OWNER_HASH_SIZE; i++) {
+ list_for_each_entry_safe(sop, next, &ownerstr_hashtbl[i], so_strhash) {
+ if (sop->so_is_open_owner != is_open_owner)
+ continue;
+ release_sop(sop);
+ if (++count == num)
+ return count;
+ }
+ }
+ return count;
+}
+
+void nfsd_forget_locks(u64 num)
+{
+ int count;
+
+ nfs4_lock_state();
+ count = nfsd_release_n_owners(num, false, release_lockowner_sop);
+ nfs4_unlock_state();
+
+ printk(KERN_INFO "NFSD: Forgot %d locks", count);
+}
+
+void nfsd_forget_openowners(u64 num)
+{
+ int count;
+
+ nfs4_lock_state();
+ count = nfsd_release_n_owners(num, true, release_openowner_sop);
+ nfs4_unlock_state();
+
+ printk(KERN_INFO "NFSD: Forgot %d open owners", count);
+}
+
+int nfsd_process_n_delegations(u64 num, void (*deleg_func)(struct nfs4_delegation *))
+{
+ int i, count = 0;
+ struct nfs4_file *fp, *fnext;
+ struct nfs4_delegation *dp, *dnext;
+
+ for (i = 0; i < FILE_HASH_SIZE; i++) {
+ list_for_each_entry_safe(fp, fnext, &file_hashtbl[i], fi_hash) {
+ list_for_each_entry_safe(dp, dnext, &fp->fi_delegations, dl_perfile) {
+ deleg_func(dp);
+ if (++count == num)
+ return count;
+ }
+ }
+ }
+
+ return count;
+}
+
+void nfsd_forget_delegations(u64 num)
+{
+ unsigned int count;
+
+ nfs4_lock_state();
+ count = nfsd_process_n_delegations(num, unhash_delegation);
+ nfs4_unlock_state();
+
+ printk(KERN_INFO "NFSD: Forgot %d delegations", count);
+}
+
+void nfsd_recall_delegations(u64 num)
+{
+ unsigned int count;
+
+ nfs4_lock_state();
+ spin_lock(&recall_lock);
+ count = nfsd_process_n_delegations(num, nfsd_break_one_deleg);
+ spin_unlock(&recall_lock);
+ nfs4_unlock_state();
+
+ printk(KERN_INFO "NFSD: Recalled %d delegations", count);
+}
+
+#endif /* CONFIG_NFSD_FAULT_INJECTION */
+
+/* initialization to perform at module load time: */
+
+void
+nfs4_state_init(void)
+{
+ int i;
+
+ 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]);
+ INIT_LIST_HEAD(&reclaim_str_hashtbl[i]);
+ }
+ for (i = 0; i < SESSION_HASH_SIZE; i++)
+ INIT_LIST_HEAD(&sessionid_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]);
+ }
+ for (i = 0; i < LOCKOWNER_INO_HASH_SIZE; i++)
+ INIT_LIST_HEAD(&lockowner_ino_hashtbl[i]);
+ INIT_LIST_HEAD(&close_lru);
+ INIT_LIST_HEAD(&client_lru);
+ INIT_LIST_HEAD(&del_recall_lru);
+ reclaim_str_hashtbl_size = 0;
+}
+
+/*
+ * 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: */
+
+int
+nfs4_state_start(void)
+{
+ int ret;
+
+ /*
+ * FIXME: For now, we hang most of the pernet global stuff off of
+ * init_net until nfsd is fully containerized. Eventually, we'll
+ * need to pass a net pointer into this function, take a reference
+ * to that instead and then do most of the rest of this on a per-net
+ * basis.
+ */
+ get_net(&init_net);
+ nfsd4_client_tracking_init(&init_net);
+ boot_time = get_seconds();
+ locks_start_grace(&nfsd4_manager);
+ printk(KERN_INFO "NFSD: starting %ld-second grace period\n",
+ nfsd4_grace);
+ ret = set_callback_cred();
+ if (ret) {
+ ret = -ENOMEM;
+ goto out_recovery;
+ }
+ laundry_wq = create_singlethread_workqueue("nfsd4");
+ if (laundry_wq == NULL) {
+ ret = -ENOMEM;
+ goto out_recovery;
+ }
+ ret = nfsd4_create_callback_queue();
+ if (ret)
+ goto out_free_laundry;
+ queue_delayed_work(laundry_wq, &laundromat_work, nfsd4_grace * HZ);
+ set_max_delegations();
+ return 0;
+out_free_laundry:
+ destroy_workqueue(laundry_wq);
+out_recovery:
+ nfsd4_client_tracking_exit(&init_net);
+ put_net(&init_net);
+ return ret;
+}
+
+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);
+ unhash_delegation(dp);
+ }
+
+ nfsd4_client_tracking_exit(&init_net);
+ put_net(&init_net);
+}
+
+void
+nfs4_state_shutdown(void)
+{
+ cancel_delayed_work_sync(&laundromat_work);
+ destroy_workqueue(laundry_wq);
+ locks_end_grace(&nfsd4_manager);
+ nfs4_lock_state();
+ __nfs4_state_shutdown();
+ nfs4_unlock_state();
+ nfsd4_destroy_callback_queue();
+}
+
+static void
+get_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
+{
+ if (HAS_STATE_ID(cstate, CURRENT_STATE_ID_FLAG) && CURRENT_STATEID(stateid))
+ memcpy(stateid, &cstate->current_stateid, sizeof(stateid_t));
+}
+
+static void
+put_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
+{
+ if (cstate->minorversion) {
+ memcpy(&cstate->current_stateid, stateid, sizeof(stateid_t));
+ SET_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
+ }
+}
+
+void
+clear_current_stateid(struct nfsd4_compound_state *cstate)
+{
+ CLEAR_STATE_ID(cstate, CURRENT_STATE_ID_FLAG);
+}
+
+/*
+ * functions to set current state id
+ */
+void
+nfsd4_set_opendowngradestateid(struct nfsd4_compound_state *cstate, struct nfsd4_open_downgrade *odp)
+{
+ put_stateid(cstate, &odp->od_stateid);
+}
+
+void
+nfsd4_set_openstateid(struct nfsd4_compound_state *cstate, struct nfsd4_open *open)
+{
+ put_stateid(cstate, &open->op_stateid);
+}
+
+void
+nfsd4_set_closestateid(struct nfsd4_compound_state *cstate, struct nfsd4_close *close)
+{
+ put_stateid(cstate, &close->cl_stateid);
+}
+
+void
+nfsd4_set_lockstateid(struct nfsd4_compound_state *cstate, struct nfsd4_lock *lock)
+{
+ put_stateid(cstate, &lock->lk_resp_stateid);
+}
+
+/*
+ * functions to consume current state id
+ */
+
+void
+nfsd4_get_opendowngradestateid(struct nfsd4_compound_state *cstate, struct nfsd4_open_downgrade *odp)
+{
+ get_stateid(cstate, &odp->od_stateid);
+}
+
+void
+nfsd4_get_delegreturnstateid(struct nfsd4_compound_state *cstate, struct nfsd4_delegreturn *drp)
+{
+ get_stateid(cstate, &drp->dr_stateid);
+}
+
+void
+nfsd4_get_freestateid(struct nfsd4_compound_state *cstate, struct nfsd4_free_stateid *fsp)
+{
+ get_stateid(cstate, &fsp->fr_stateid);
+}
+
+void
+nfsd4_get_setattrstateid(struct nfsd4_compound_state *cstate, struct nfsd4_setattr *setattr)
+{
+ get_stateid(cstate, &setattr->sa_stateid);
+}
+
+void
+nfsd4_get_closestateid(struct nfsd4_compound_state *cstate, struct nfsd4_close *close)
+{
+ get_stateid(cstate, &close->cl_stateid);
+}
+
+void
+nfsd4_get_lockustateid(struct nfsd4_compound_state *cstate, struct nfsd4_locku *locku)
+{
+ get_stateid(cstate, &locku->lu_stateid);
+}
+
+void
+nfsd4_get_readstateid(struct nfsd4_compound_state *cstate, struct nfsd4_read *read)
+{
+ get_stateid(cstate, &read->rd_stateid);
+}
+
+void
+nfsd4_get_writestateid(struct nfsd4_compound_state *cstate, struct nfsd4_write *write)
+{
+ get_stateid(cstate, &write->wr_stateid);
+}