^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /* SPDX-License-Identifier: GPL-2.0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Request reply cache. This was heavily inspired by the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * implementation in 4.3BSD/4.4BSD.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #ifndef NFSCACHE_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #define NFSCACHE_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/sunrpc/svc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include "netns.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * Representation of a reply cache entry.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * Note that we use a sockaddr_in6 to hold the address instead of the more
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) * typical sockaddr_storage. This is for space reasons, since sockaddr_storage
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) * is much larger than a sockaddr_in6.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) struct svc_cacherep {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) struct {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) /* Keep often-read xid, csum in the same cache line: */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) __be32 k_xid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) __wsum k_csum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) u32 k_proc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) u32 k_prot;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) u32 k_vers;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) unsigned int k_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) struct sockaddr_in6 k_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) } c_key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) struct rb_node c_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) struct list_head c_lru;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) unsigned char c_state, /* unused, inprog, done */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) c_type, /* status, buffer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) c_secure : 1; /* req came from port < 1024 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) unsigned long c_timestamp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) union {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) struct kvec u_vec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) __be32 u_status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) } c_u;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) #define c_replvec c_u.u_vec
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) #define c_replstat c_u.u_status
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) /* cache entry states */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) enum {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) RC_UNUSED,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) RC_INPROG,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) RC_DONE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) /* return values */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) enum {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) RC_DROPIT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) RC_REPLY,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) RC_DOIT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) * Cache types.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) * We may want to add more types one day, e.g. for diropres and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) * attrstat replies. Using cache entries with fixed length instead
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) * of buffer pointers may be more efficient.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) enum {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) RC_NOCACHE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) RC_REPLSTAT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) RC_REPLBUFF,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) /* Cache entries expire after this time period */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) #define RC_EXPIRE (120 * HZ)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) /* Checksum this amount of the request */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) #define RC_CSUMLEN (256U)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) int nfsd_drc_slab_create(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) void nfsd_drc_slab_free(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) int nfsd_reply_cache_init(struct nfsd_net *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) void nfsd_reply_cache_shutdown(struct nfsd_net *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) int nfsd_cache_lookup(struct svc_rqst *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) void nfsd_cache_update(struct svc_rqst *, int, __be32 *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) int nfsd_reply_cache_stats_open(struct inode *, struct file *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) #endif /* NFSCACHE_H */
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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