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Commit 6658d3a7 authored by NeilBrown's avatar NeilBrown Committed by Linus Torvalds
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[PATCH] knfsd: remove nfsd_versbits as intermediate storage for desired versions 



We have an array 'nfsd_version' which lists the available versions of nfsd,
and 'nfsd_versions' (poor choice there :-() which lists the currently active
versions.

Then we have a bitmap - nfsd_versbits which says which versions are wanted.
The bits in this bitset cause content to be copied from nfsd_version to
nfsd_versions when nfsd starts.

This patch removes nfsd_versbits and moves information directly from
nfsd_version to nfsd_versions when requests for version changes arrive.

Note that this doesn't make it possible to change versions while the server is
running.  This is because serv->sv_xdrsize is calculated when a service is
created, and used when threads are created, and xdrsize depends on the active
versions.

Signed-off-by: default avatarNeil Brown <neilb@suse.de>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 24e36663

fs/nfsd/nfsctl.c

+8 −10
Original line number Diff line number Diff line
@@ -35,8 +35,6 @@ 


#include <asm/uaccess.h>



unsigned int nfsd_versbits = ~0;



/*

 *	We have a single directory with 9 nodes in it.

 */
@@ -372,6 +370,10 @@ static ssize_t write_versions(struct file *file, char *buf, size_t size) 


	if (size>0) {

		if (nfsd_serv)

			/* Cannot change versions without updating

			 * nfsd_serv->sv_xdrsize, and reallocing

			 * rq_argp and rq_resp

			 */

			return -EBUSY;

		if (buf[size-1] != '\n')

			return -EINVAL;
@@ -390,10 +392,7 @@ static ssize_t write_versions(struct file *file, char *buf, size_t size) 
			case 2:

			case 3:

			case 4:

				if (sign != '-')

					NFSCTL_VERSET(nfsd_versbits, num);

				else

					NFSCTL_VERUNSET(nfsd_versbits, num);

				nfsd_vers(num, sign == '-' ? NFSD_CLEAR : NFSD_SET);

				break;

			default:

				return -EINVAL;
@@ -404,16 +403,15 @@ static ssize_t write_versions(struct file *file, char *buf, size_t size) 
		/* If all get turned off, turn them back on, as

		 * having no versions is BAD

		 */

		if ((nfsd_versbits & NFSCTL_VERALL)==0)

			nfsd_versbits = NFSCTL_VERALL;

		nfsd_reset_versions();

	}

	/* Now write current state into reply buffer */

	len = 0;

	sep = "";

	for (num=2 ; num <= 4 ; num++)

		if (NFSCTL_VERISSET(NFSCTL_VERALL, num)) {

		if (nfsd_vers(num, NFSD_AVAIL)) {

			len += sprintf(buf+len, "%s%c%d", sep,

				       NFSCTL_VERISSET(nfsd_versbits, num)?'+':'-',

				       nfsd_vers(num, NFSD_TEST)?'+':'-',

				       num);

			sep = " ";

		}

fs/nfsd/nfssvc.c

+50 −43
Original line number Diff line number Diff line
@@ -117,6 +117,32 @@ struct svc_program nfsd_program = { 


};



int nfsd_vers(int vers, enum vers_op change)

{

	if (vers < NFSD_MINVERS || vers >= NFSD_NRVERS)

		return -1;

	switch(change) {

	case NFSD_SET:

		nfsd_versions[vers] = nfsd_version[vers];

		break;

#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)

		if (vers < NFSD_ACL_NRVERS)

			nfsd_acl_version[vers] = nfsd_acl_version[vers];

#endif

	case NFSD_CLEAR:

		nfsd_versions[vers] = NULL;

#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)

		if (vers < NFSD_ACL_NRVERS)

			nfsd_acl_version[vers] = NULL;

#endif

		break;

	case NFSD_TEST:

		return nfsd_versions[vers] != NULL;

	case NFSD_AVAIL:

		return nfsd_version[vers] != NULL;

	}

	return 0;

}

/*

 * Maximum number of nfsd processes

 */
@@ -147,16 +173,36 @@ static void nfsd_last_thread(struct svc_serv *serv) 
		nfsd_export_flush();

	}

}



void nfsd_reset_versions(void)

{

	int found_one = 0;

	int i;



	for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) {

		if (nfsd_program.pg_vers[i])

			found_one = 1;

	}



	if (!found_one) {

		for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++)

			nfsd_program.pg_vers[i] = nfsd_version[i];

#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)

		for (i = NFSD_ACL_MINVERS; i < NFSD_ACL_NRVERS; i++)

			nfsd_acl_program.pg_vers[i] =

				nfsd_acl_version[i];

#endif

	}

}



int

nfsd_svc(unsigned short port, int nrservs)

{

	int	error;

	int	found_one, i;

	struct list_head *victim;

	

	lock_kernel();

	dprintk("nfsd: creating service: vers 0x%x\n",

		nfsd_versbits);

	dprintk("nfsd: creating service\n");

	error = -EINVAL;

	if (nrservs <= 0)

		nrservs = 0;
@@ -171,46 +217,7 @@ nfsd_svc(unsigned short port, int nrservs) 
	if (error<0)

		goto out;

	if (!nfsd_serv) {

		/*

		 * Use the nfsd_ctlbits to define which

		 * versions that will be advertised.

		 * If nfsd_ctlbits doesn't list any version,

		 * export them all.

		 */

		found_one = 0;



		for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++) {

			if (NFSCTL_VERISSET(nfsd_versbits, i)) {

				nfsd_program.pg_vers[i] = nfsd_version[i];

				found_one = 1;

			} else

				nfsd_program.pg_vers[i] = NULL;

		}



		if (!found_one) {

			for (i = NFSD_MINVERS; i < NFSD_NRVERS; i++)

				nfsd_program.pg_vers[i] = nfsd_version[i];

		}





#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)

		found_one = 0;



		for (i = NFSD_ACL_MINVERS; i < NFSD_ACL_NRVERS; i++) {

			if (NFSCTL_VERISSET(nfsd_versbits, i)) {

				nfsd_acl_program.pg_vers[i] =

					nfsd_acl_version[i];

				found_one = 1;

			} else

				nfsd_acl_program.pg_vers[i] = NULL;

		}



		if (!found_one) {

			for (i = NFSD_ACL_MINVERS; i < NFSD_ACL_NRVERS; i++)

				nfsd_acl_program.pg_vers[i] =

					nfsd_acl_version[i];

		}

#endif

		nfsd_reset_versions();



		atomic_set(&nfsd_busy, 0);

		error = -ENOMEM;

include/linux/nfsd/nfsd.h

+4 −0
Original line number Diff line number Diff line
@@ -140,6 +140,10 @@ struct posix_acl *nfsd_get_posix_acl(struct svc_fh *, int); 
int nfsd_set_posix_acl(struct svc_fh *, int, struct posix_acl *);

#endif



enum vers_op {NFSD_SET, NFSD_CLEAR, NFSD_TEST, NFSD_AVAIL };

int nfsd_vers(int vers, enum vers_op change);

void nfsd_reset_versions(void);





/* 

 * NFSv4 State

include/linux/nfsd/syscall.h

+0 −17
Original line number Diff line number Diff line
@@ -38,21 +38,6 @@ 
#define NFSCTL_GETFD		7	/* get an fh by path (used by mountd) */

#define	NFSCTL_GETFS		8	/* get an fh by path with max FH len */



/*

 * Macros used to set version

 */

#define NFSCTL_VERSET(_cltbits, _v)   ((_cltbits) |=  (1 << (_v)))

#define NFSCTL_VERUNSET(_cltbits, _v) ((_cltbits) &= ~(1 << (_v)))

#define NFSCTL_VERISSET(_cltbits, _v) ((_cltbits) & (1 << (_v)))



#if defined(CONFIG_NFSD_V4)

#define	NFSCTL_VERALL	(0x1c /* 0b011100 */)

#elif defined(CONFIG_NFSD_V3)

#define	NFSCTL_VERALL	(0x0c /* 0b001100 */)

#else

#define	NFSCTL_VERALL	(0x04 /* 0b000100 */)

#endif



/* SVC */

struct nfsctl_svc {

	unsigned short		svc_port;
@@ -134,8 +119,6 @@ extern int exp_delclient(struct nfsctl_client *ncp); 
extern int		exp_export(struct nfsctl_export *nxp);

extern int		exp_unexport(struct nfsctl_export *nxp);



extern unsigned int nfsd_versbits;



#endif /* __KERNEL__ */



#endif /* NFSD_SYSCALL_H */