Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 | 2 | /* |
1da177e4 LT |
3 | * Request reply cache. This was heavily inspired by the |
4 | * implementation in 4.3BSD/4.4BSD. | |
5 | * | |
6 | * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> | |
7 | */ | |
8 | ||
9 | #ifndef NFSCACHE_H | |
10 | #define NFSCACHE_H | |
11 | ||
72579ac9 | 12 | #include <linux/sunrpc/svc.h> |
3ba75830 | 13 | #include "netns.h" |
1da177e4 LT |
14 | |
15 | /* | |
fca4217c | 16 | * Representation of a reply cache entry. |
7b9e8522 JL |
17 | * |
18 | * Note that we use a sockaddr_in6 to hold the address instead of the more | |
19 | * typical sockaddr_storage. This is for space reasons, since sockaddr_storage | |
20 | * is much larger than a sockaddr_in6. | |
1da177e4 | 21 | */ |
e7421ce7 | 22 | struct nfsd_cacherep { |
ed00c2f6 TM |
23 | struct { |
24 | /* Keep often-read xid, csum in the same cache line: */ | |
25 | __be32 k_xid; | |
26 | __wsum k_csum; | |
27 | u32 k_proc; | |
28 | u32 k_prot; | |
29 | u32 k_vers; | |
30 | unsigned int k_len; | |
31 | struct sockaddr_in6 k_addr; | |
32 | } c_key; | |
1da177e4 | 33 | |
736c6625 | 34 | struct rb_node c_node; |
ed00c2f6 | 35 | struct list_head c_lru; |
1da177e4 LT |
36 | unsigned char c_state, /* unused, inprog, done */ |
37 | c_type, /* status, buffer */ | |
38 | c_secure : 1; /* req came from port < 1024 */ | |
1da177e4 LT |
39 | unsigned long c_timestamp; |
40 | union { | |
41 | struct kvec u_vec; | |
c7afef1f | 42 | __be32 u_status; |
1da177e4 LT |
43 | } c_u; |
44 | }; | |
45 | ||
46 | #define c_replvec c_u.u_vec | |
47 | #define c_replstat c_u.u_status | |
48 | ||
49 | /* cache entry states */ | |
50 | enum { | |
51 | RC_UNUSED, | |
52 | RC_INPROG, | |
53 | RC_DONE | |
54 | }; | |
55 | ||
56 | /* return values */ | |
57 | enum { | |
58 | RC_DROPIT, | |
59 | RC_REPLY, | |
09662d58 | 60 | RC_DOIT |
1da177e4 LT |
61 | }; |
62 | ||
63 | /* | |
64 | * Cache types. | |
65 | * We may want to add more types one day, e.g. for diropres and | |
66 | * attrstat replies. Using cache entries with fixed length instead | |
67 | * of buffer pointers may be more efficient. | |
68 | */ | |
69 | enum { | |
70 | RC_NOCACHE, | |
71 | RC_REPLSTAT, | |
72 | RC_REPLBUFF, | |
73 | }; | |
74 | ||
d1a0774d JL |
75 | /* Cache entries expire after this time period */ |
76 | #define RC_EXPIRE (120 * HZ) | |
77 | ||
01a7decf JL |
78 | /* Checksum this amount of the request */ |
79 | #define RC_CSUMLEN (256U) | |
80 | ||
027690c7 BF |
81 | int nfsd_drc_slab_create(void); |
82 | void nfsd_drc_slab_free(void); | |
ed9ab734 JL |
83 | int nfsd_net_reply_cache_init(struct nfsd_net *nn); |
84 | void nfsd_net_reply_cache_destroy(struct nfsd_net *nn); | |
3ba75830 BF |
85 | int nfsd_reply_cache_init(struct nfsd_net *); |
86 | void nfsd_reply_cache_shutdown(struct nfsd_net *); | |
cb18eca4 | 87 | int nfsd_cache_lookup(struct svc_rqst *rqstp, |
e7421ce7 CL |
88 | struct nfsd_cacherep **cacherep); |
89 | void nfsd_cache_update(struct svc_rqst *rqstp, struct nfsd_cacherep *rp, | |
cb18eca4 | 90 | int cachetype, __be32 *statp); |
64776611 | 91 | int nfsd_reply_cache_stats_show(struct seq_file *m, void *v); |
04826f43 | 92 | |
1da177e4 | 93 | #endif /* NFSCACHE_H */ |