mirror of
https://github.com/torvalds/linux.git
synced 2024-11-22 12:11:40 +00:00
73598a0cfb
Instead of using kmalloc to allocate an array for storing active version info, just declare an array to the max size - it is only 5 or so. Signed-off-by: NeilBrown <neilb@suse.de> Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
92 lines
2.1 KiB
C
92 lines
2.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* Request reply cache. This was heavily inspired by the
|
|
* implementation in 4.3BSD/4.4BSD.
|
|
*
|
|
* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
|
|
*/
|
|
|
|
#ifndef NFSCACHE_H
|
|
#define NFSCACHE_H
|
|
|
|
#include <linux/sunrpc/svc.h>
|
|
#include "nfsd.h"
|
|
|
|
/*
|
|
* Representation of a reply cache entry.
|
|
*
|
|
* Note that we use a sockaddr_in6 to hold the address instead of the more
|
|
* typical sockaddr_storage. This is for space reasons, since sockaddr_storage
|
|
* is much larger than a sockaddr_in6.
|
|
*/
|
|
struct nfsd_cacherep {
|
|
struct {
|
|
/* Keep often-read xid, csum in the same cache line: */
|
|
__be32 k_xid;
|
|
__wsum k_csum;
|
|
u32 k_proc;
|
|
u32 k_prot;
|
|
u32 k_vers;
|
|
unsigned int k_len;
|
|
struct sockaddr_in6 k_addr;
|
|
} c_key;
|
|
|
|
struct rb_node c_node;
|
|
struct list_head c_lru;
|
|
unsigned char c_state, /* unused, inprog, done */
|
|
c_type, /* status, buffer */
|
|
c_secure : 1; /* req came from port < 1024 */
|
|
unsigned long c_timestamp;
|
|
union {
|
|
struct kvec u_vec;
|
|
__be32 u_status;
|
|
} c_u;
|
|
};
|
|
|
|
#define c_replvec c_u.u_vec
|
|
#define c_replstat c_u.u_status
|
|
|
|
/* cache entry states */
|
|
enum {
|
|
RC_UNUSED,
|
|
RC_INPROG,
|
|
RC_DONE
|
|
};
|
|
|
|
/* return values */
|
|
enum {
|
|
RC_DROPIT,
|
|
RC_REPLY,
|
|
RC_DOIT
|
|
};
|
|
|
|
/*
|
|
* Cache types.
|
|
* We may want to add more types one day, e.g. for diropres and
|
|
* attrstat replies. Using cache entries with fixed length instead
|
|
* of buffer pointers may be more efficient.
|
|
*/
|
|
enum {
|
|
RC_NOCACHE,
|
|
RC_REPLSTAT,
|
|
RC_REPLBUFF,
|
|
};
|
|
|
|
/* Cache entries expire after this time period */
|
|
#define RC_EXPIRE (120 * HZ)
|
|
|
|
/* Checksum this amount of the request */
|
|
#define RC_CSUMLEN (256U)
|
|
|
|
int nfsd_drc_slab_create(void);
|
|
void nfsd_drc_slab_free(void);
|
|
int nfsd_reply_cache_init(struct nfsd_net *);
|
|
void nfsd_reply_cache_shutdown(struct nfsd_net *);
|
|
int nfsd_cache_lookup(struct svc_rqst *rqstp, unsigned int start,
|
|
unsigned int len, struct nfsd_cacherep **cacherep);
|
|
void nfsd_cache_update(struct svc_rqst *rqstp, struct nfsd_cacherep *rp,
|
|
int cachetype, __be32 *statp);
|
|
int nfsd_reply_cache_stats_show(struct seq_file *m, void *v);
|
|
|
|
#endif /* NFSCACHE_H */
|