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Commit e1ca12df authored by Bryan Schumaker's avatar Bryan Schumaker Committed by J. Bruce Fields
Browse files

NFSD: added FREE_STATEID operation 



This operation is used by the client to tell the server to free a
stateid.

Signed-off-by: default avatarBryan Schumaker <bjschuma@netapp.com>
Signed-off-by: default avatarJ. Bruce Fields <bfields@redhat.com>
parent ebc63e53

fs/nfsd/nfs4proc.c

+5 −0
Original line number Diff line number Diff line
@@ -1417,6 +1417,11 @@ static struct nfsd4_operation nfsd4_ops[] = { 
		.op_flags = OP_HANDLES_WRONGSEC,

		.op_name = "OP_SECINFO_NO_NAME",

	},

	[OP_FREE_STATEID] = {

		.op_func = (nfsd4op_func)nfsd4_free_stateid,

		.op_flags = ALLOWED_WITHOUT_FH,

		.op_name = "OP_FREE_STATEID",

	},

};



static const char *nfsd4_op_name(unsigned opnum)

fs/nfsd/nfs4state.c

+118 −0
Original line number Diff line number Diff line
@@ -60,9 +60,12 @@ static u64 current_sessionid = 1; 


/* forward declarations */

static struct nfs4_stateid * find_stateid(stateid_t *stid, int flags);

static struct nfs4_stateid * search_for_stateid(stateid_t *stid);

static struct nfs4_delegation * search_for_delegation(stateid_t *stid);

static struct nfs4_delegation * find_delegation_stateid(struct inode *ino, stateid_t *stid);

static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";

static void nfs4_set_recdir(char *recdir);

static int check_for_locks(struct nfs4_file *filp, struct nfs4_stateowner *lowner);



/* Locking: */
@@ -3137,6 +3140,11 @@ static int is_delegation_stateid(stateid_t *stateid) 
	return stateid->si_fileid == 0;

}



static int is_open_stateid(struct nfs4_stateid *stateid)

{

	return stateid->st_openstp == NULL;

}



/*

* Checks for stateid operations

*/
@@ -3216,6 +3224,70 @@ out: 
	return status;

}



static __be32

nfsd4_free_delegation_stateid(stateid_t *stateid)

{

	struct nfs4_delegation *dp = search_for_delegation(stateid);

	if (dp)

		return nfserr_locks_held;

	return nfserr_bad_stateid;

}



static __be32

nfsd4_free_lock_stateid(struct nfs4_stateid *stp)

{

	if (check_for_locks(stp->st_file, stp->st_stateowner))

		return nfserr_locks_held;

	release_lock_stateid(stp);

	return nfs_ok;

}



/*

 * Free a state id

 */

__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_stateid *stp;

	__be32 ret;



	nfs4_lock_state();

	if (is_delegation_stateid(stateid)) {

		ret = nfsd4_free_delegation_stateid(stateid);

		goto out;

	}



	stp = search_for_stateid(stateid);

	if (!stp) {

		ret = nfserr_bad_stateid;

		goto out;

	}

	if (stateid->si_generation != 0) {

		if (stateid->si_generation < stp->st_stateid.si_generation) {

			ret = nfserr_old_stateid;

			goto out;

		}

		if (stateid->si_generation > stp->st_stateid.si_generation) {

			ret = nfserr_bad_stateid;

			goto out;

		}

	}



	if (is_open_stateid(stp)) {

		ret = nfserr_locks_held;

		goto out;

	} else {

		ret = nfsd4_free_lock_stateid(stp);

		goto out;

	}



out:

	nfs4_unlock_state();

	return ret;

}



static inline int

setlkflg (int type)

{
@@ -3594,6 +3666,14 @@ static struct list_head lock_ownerid_hashtbl[LOCK_HASH_SIZE]; 
static struct list_head	lock_ownerstr_hashtbl[LOCK_HASH_SIZE];

static struct list_head lockstateid_hashtbl[STATEID_HASH_SIZE];



static int

same_stateid(stateid_t *id_one, stateid_t *id_two)

{

	if (id_one->si_stateownerid != id_two->si_stateownerid)

		return 0;

	return id_one->si_fileid == id_two->si_fileid;

}



static struct nfs4_stateid *

find_stateid(stateid_t *stid, int flags)

{
@@ -3623,6 +3703,44 @@ find_stateid(stateid_t *stid, int flags) 
	return NULL;

}



static struct nfs4_stateid *

search_for_stateid(stateid_t *stid)

{

	struct nfs4_stateid *local;

	unsigned int hashval = stateid_hashval(stid->si_stateownerid, stid->si_fileid);



	list_for_each_entry(local, &lockstateid_hashtbl[hashval], st_hash) {

		if (same_stateid(&local->st_stateid, stid))

			return local;

	}



	list_for_each_entry(local, &stateid_hashtbl[hashval], st_hash) {

		if (same_stateid(&local->st_stateid, stid))

			return local;

	}

	return NULL;

}



static struct nfs4_delegation *

search_for_delegation(stateid_t *stid)

{

	struct nfs4_file *fp;

	struct nfs4_delegation *dp;

	struct list_head *pos;

	int i;



	for (i = 0; i < FILE_HASH_SIZE; i++) {

		list_for_each_entry(fp, &file_hashtbl[i], fi_hash) {

			list_for_each(pos, &fp->fi_delegations) {

				dp = list_entry(pos, struct nfs4_delegation, dl_perfile);

				if (same_stateid(&dp->dl_stateid, stid))

					return dp;

			}

		}

	}

	return NULL;

}



static struct nfs4_delegation *

find_delegation_stateid(struct inode *ino, stateid_t *stid)

{

fs/nfsd/nfs4xdr.c

+30 −2
Original line number Diff line number Diff line
@@ -1245,6 +1245,19 @@ nfsd4_decode_destroy_session(struct nfsd4_compoundargs *argp, 
	DECODE_TAIL;

}



static __be32

nfsd4_decode_free_stateid(struct nfsd4_compoundargs *argp,

			  struct nfsd4_free_stateid *free_stateid)

{

	DECODE_HEAD;



	READ_BUF(sizeof(stateid_t));

	READ32(free_stateid->fr_stateid.si_generation);

	COPYMEM(&free_stateid->fr_stateid.si_opaque, sizeof(stateid_opaque_t));



	DECODE_TAIL;

}



static __be32

nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,

		      struct nfsd4_sequence *seq)
@@ -1370,7 +1383,7 @@ static nfsd4_dec nfsd41_dec_ops[] = { 
	[OP_EXCHANGE_ID]	= (nfsd4_dec)nfsd4_decode_exchange_id,

	[OP_CREATE_SESSION]	= (nfsd4_dec)nfsd4_decode_create_session,

	[OP_DESTROY_SESSION]	= (nfsd4_dec)nfsd4_decode_destroy_session,

	[OP_FREE_STATEID]	= (nfsd4_dec)nfsd4_decode_notsupp,

	[OP_FREE_STATEID]	= (nfsd4_dec)nfsd4_decode_free_stateid,

	[OP_GET_DIR_DELEGATION]	= (nfsd4_dec)nfsd4_decode_notsupp,

	[OP_GETDEVICEINFO]	= (nfsd4_dec)nfsd4_decode_notsupp,

	[OP_GETDEVICELIST]	= (nfsd4_dec)nfsd4_decode_notsupp,
@@ -3115,6 +3128,21 @@ nfsd4_encode_destroy_session(struct nfsd4_compoundres *resp, int nfserr, 
	return nfserr;

}



static __be32

nfsd4_encode_free_stateid(struct nfsd4_compoundres *resp, int nfserr,

			  struct nfsd4_free_stateid *free_stateid)

{

	__be32 *p;



	if (nfserr)

		return nfserr;



	RESERVE_SPACE(4);

	WRITE32(nfserr);

	ADJUST_ARGS();

	return nfserr;

}



static __be32

nfsd4_encode_sequence(struct nfsd4_compoundres *resp, int nfserr,

		      struct nfsd4_sequence *seq)
@@ -3196,7 +3224,7 @@ static nfsd4_enc nfsd4_enc_ops[] = { 
	[OP_EXCHANGE_ID]	= (nfsd4_enc)nfsd4_encode_exchange_id,

	[OP_CREATE_SESSION]	= (nfsd4_enc)nfsd4_encode_create_session,

	[OP_DESTROY_SESSION]	= (nfsd4_enc)nfsd4_encode_destroy_session,

	[OP_FREE_STATEID]	= (nfsd4_enc)nfsd4_encode_noop,

	[OP_FREE_STATEID]	= (nfsd4_enc)nfsd4_encode_free_stateid,

	[OP_GET_DIR_DELEGATION]	= (nfsd4_enc)nfsd4_encode_noop,

	[OP_GETDEVICEINFO]	= (nfsd4_enc)nfsd4_encode_noop,

	[OP_GETDEVICELIST]	= (nfsd4_enc)nfsd4_encode_noop,

fs/nfsd/xdr4.h

+8 −0
Original line number Diff line number Diff line
@@ -342,6 +342,11 @@ struct nfsd4_setclientid_confirm { 
	nfs4_verifier	sc_confirm;

};



struct nfsd4_free_stateid {

	stateid_t	fr_stateid;         /* request */

	__be32		fr_status;          /* response */

};



/* also used for NVERIFY */

struct nfsd4_verify {

	u32		ve_bmval[3];        /* request */
@@ -432,6 +437,7 @@ struct nfsd4_op { 
		struct nfsd4_destroy_session	destroy_session;

		struct nfsd4_sequence		sequence;

		struct nfsd4_reclaim_complete	reclaim_complete;

		struct nfsd4_free_stateid	free_stateid;

	} u;

	struct nfs4_replay *			replay;

};
@@ -564,6 +570,8 @@ extern __be32 nfsd4_delegreturn(struct svc_rqst *rqstp, 
		struct nfsd4_compound_state *, struct nfsd4_delegreturn *dr);

extern __be32 nfsd4_renew(struct svc_rqst *rqstp,

			  struct nfsd4_compound_state *, clientid_t *clid);

extern __be32 nfsd4_free_stateid(struct svc_rqst *rqstp,

		struct nfsd4_compound_state *, struct nfsd4_free_stateid *free_stateid);

#endif



/*