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[PATCH] knfsd: remove nfsd_versbits as intermediate storage for desired versions

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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: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
NeilBrown 2006-10-02 02:17:46 -07:00 committed by Linus Torvalds
parent 24e36663c3
commit 6658d3a7bb
4 changed files with 62 additions and 70 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
fs/nfsd/nfsctl.c
View File

@ -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 = " ";
}

93
fs/nfsd/nfssvc.c
View File

@ -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;

4
include/linux/nfsd/nfsd.h
View File

@ -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

17
include/linux/nfsd/syscall.h
View File

@ -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 */