diff options
Diffstat (limited to 'ANDROID_3.4.5/fs/lockd/clntxdr.c')
| -rw-r--r-- | ANDROID_3.4.5/fs/lockd/clntxdr.c | 627 |
1 files changed, 0 insertions, 627 deletions
diff --git a/ANDROID_3.4.5/fs/lockd/clntxdr.c b/ANDROID_3.4.5/fs/lockd/clntxdr.c deleted file mode 100644 index d269ada7..00000000 --- a/ANDROID_3.4.5/fs/lockd/clntxdr.c +++ /dev/null @@ -1,627 +0,0 @@ -/* - * linux/fs/lockd/clntxdr.c - * - * XDR functions to encode/decode NLM version 3 RPC arguments and results. - * NLM version 3 is backwards compatible with NLM versions 1 and 2. - * - * NLM client-side only. - * - * Copyright (C) 2010, Oracle. All rights reserved. - */ - -#include <linux/types.h> -#include <linux/sunrpc/xdr.h> -#include <linux/sunrpc/clnt.h> -#include <linux/sunrpc/stats.h> -#include <linux/lockd/lockd.h> - -#define NLMDBG_FACILITY NLMDBG_XDR - -#if (NLMCLNT_OHSIZE > XDR_MAX_NETOBJ) -# error "NLM host name cannot be larger than XDR_MAX_NETOBJ!" -#endif - -/* - * Declare the space requirements for NLM arguments and replies as - * number of 32bit-words - */ -#define NLM_cookie_sz (1+(NLM_MAXCOOKIELEN>>2)) -#define NLM_caller_sz (1+(NLMCLNT_OHSIZE>>2)) -#define NLM_owner_sz (1+(NLMCLNT_OHSIZE>>2)) -#define NLM_fhandle_sz (1+(NFS2_FHSIZE>>2)) -#define NLM_lock_sz (3+NLM_caller_sz+NLM_owner_sz+NLM_fhandle_sz) -#define NLM_holder_sz (4+NLM_owner_sz) - -#define NLM_testargs_sz (NLM_cookie_sz+1+NLM_lock_sz) -#define NLM_lockargs_sz (NLM_cookie_sz+4+NLM_lock_sz) -#define NLM_cancargs_sz (NLM_cookie_sz+2+NLM_lock_sz) -#define NLM_unlockargs_sz (NLM_cookie_sz+NLM_lock_sz) - -#define NLM_testres_sz (NLM_cookie_sz+1+NLM_holder_sz) -#define NLM_res_sz (NLM_cookie_sz+1) -#define NLM_norep_sz (0) - - -static s32 loff_t_to_s32(loff_t offset) -{ - s32 res; - - if (offset >= NLM_OFFSET_MAX) - res = NLM_OFFSET_MAX; - else if (offset <= -NLM_OFFSET_MAX) - res = -NLM_OFFSET_MAX; - else - res = offset; - return res; -} - -static void nlm_compute_offsets(const struct nlm_lock *lock, - u32 *l_offset, u32 *l_len) -{ - const struct file_lock *fl = &lock->fl; - - BUG_ON(fl->fl_start > NLM_OFFSET_MAX); - BUG_ON(fl->fl_end > NLM_OFFSET_MAX && - fl->fl_end != OFFSET_MAX); - - *l_offset = loff_t_to_s32(fl->fl_start); - if (fl->fl_end == OFFSET_MAX) - *l_len = 0; - else - *l_len = loff_t_to_s32(fl->fl_end - fl->fl_start + 1); -} - -/* - * Handle decode buffer overflows out-of-line. - */ -static void print_overflow_msg(const char *func, const struct xdr_stream *xdr) -{ - dprintk("lockd: %s prematurely hit the end of our receive buffer. " - "Remaining buffer length is %tu words.\n", - func, xdr->end - xdr->p); -} - - -/* - * Encode/decode NLMv3 basic data types - * - * Basic NLMv3 data types are not defined in an IETF standards - * document. X/Open has a description of these data types that - * is useful. See Chapter 10 of "Protocols for Interworking: - * XNFS, Version 3W". - * - * Not all basic data types have their own encoding and decoding - * functions. For run-time efficiency, some data types are encoded - * or decoded inline. - */ - -static void encode_bool(struct xdr_stream *xdr, const int value) -{ - __be32 *p; - - p = xdr_reserve_space(xdr, 4); - *p = value ? xdr_one : xdr_zero; -} - -static void encode_int32(struct xdr_stream *xdr, const s32 value) -{ - __be32 *p; - - p = xdr_reserve_space(xdr, 4); - *p = cpu_to_be32(value); -} - -/* - * typedef opaque netobj<MAXNETOBJ_SZ> - */ -static void encode_netobj(struct xdr_stream *xdr, - const u8 *data, const unsigned int length) -{ - __be32 *p; - - BUG_ON(length > XDR_MAX_NETOBJ); - p = xdr_reserve_space(xdr, 4 + length); - xdr_encode_opaque(p, data, length); -} - -static int decode_netobj(struct xdr_stream *xdr, - struct xdr_netobj *obj) -{ - u32 length; - __be32 *p; - - p = xdr_inline_decode(xdr, 4); - if (unlikely(p == NULL)) - goto out_overflow; - length = be32_to_cpup(p++); - if (unlikely(length > XDR_MAX_NETOBJ)) - goto out_size; - obj->len = length; - obj->data = (u8 *)p; - return 0; -out_size: - dprintk("NFS: returned netobj was too long: %u\n", length); - return -EIO; -out_overflow: - print_overflow_msg(__func__, xdr); - return -EIO; -} - -/* - * netobj cookie; - */ -static void encode_cookie(struct xdr_stream *xdr, - const struct nlm_cookie *cookie) -{ - BUG_ON(cookie->len > NLM_MAXCOOKIELEN); - encode_netobj(xdr, (u8 *)&cookie->data, cookie->len); -} - -static int decode_cookie(struct xdr_stream *xdr, - struct nlm_cookie *cookie) -{ - u32 length; - __be32 *p; - - p = xdr_inline_decode(xdr, 4); - if (unlikely(p == NULL)) - goto out_overflow; - length = be32_to_cpup(p++); - /* apparently HPUX can return empty cookies */ - if (length == 0) - goto out_hpux; - if (length > NLM_MAXCOOKIELEN) - goto out_size; - p = xdr_inline_decode(xdr, length); - if (unlikely(p == NULL)) - goto out_overflow; - cookie->len = length; - memcpy(cookie->data, p, length); - return 0; -out_hpux: - cookie->len = 4; - memset(cookie->data, 0, 4); - return 0; -out_size: - dprintk("NFS: returned cookie was too long: %u\n", length); - return -EIO; -out_overflow: - print_overflow_msg(__func__, xdr); - return -EIO; -} - -/* - * netobj fh; - */ -static void encode_fh(struct xdr_stream *xdr, const struct nfs_fh *fh) -{ - BUG_ON(fh->size != NFS2_FHSIZE); - encode_netobj(xdr, (u8 *)&fh->data, NFS2_FHSIZE); -} - -/* - * enum nlm_stats { - * LCK_GRANTED = 0, - * LCK_DENIED = 1, - * LCK_DENIED_NOLOCKS = 2, - * LCK_BLOCKED = 3, - * LCK_DENIED_GRACE_PERIOD = 4 - * }; - * - * - * struct nlm_stat { - * nlm_stats stat; - * }; - * - * NB: we don't swap bytes for the NLM status values. The upper - * layers deal directly with the status value in network byte - * order. - */ - -static void encode_nlm_stat(struct xdr_stream *xdr, - const __be32 stat) -{ - __be32 *p; - - BUG_ON(be32_to_cpu(stat) > NLM_LCK_DENIED_GRACE_PERIOD); - p = xdr_reserve_space(xdr, 4); - *p = stat; -} - -static int decode_nlm_stat(struct xdr_stream *xdr, - __be32 *stat) -{ - __be32 *p; - - p = xdr_inline_decode(xdr, 4); - if (unlikely(p == NULL)) - goto out_overflow; - if (unlikely(ntohl(*p) > ntohl(nlm_lck_denied_grace_period))) - goto out_enum; - *stat = *p; - return 0; -out_enum: - dprintk("%s: server returned invalid nlm_stats value: %u\n", - __func__, be32_to_cpup(p)); - return -EIO; -out_overflow: - print_overflow_msg(__func__, xdr); - return -EIO; -} - -/* - * struct nlm_holder { - * bool exclusive; - * int uppid; - * netobj oh; - * unsigned l_offset; - * unsigned l_len; - * }; - */ -static void encode_nlm_holder(struct xdr_stream *xdr, - const struct nlm_res *result) -{ - const struct nlm_lock *lock = &result->lock; - u32 l_offset, l_len; - __be32 *p; - - encode_bool(xdr, lock->fl.fl_type == F_RDLCK); - encode_int32(xdr, lock->svid); - encode_netobj(xdr, lock->oh.data, lock->oh.len); - - p = xdr_reserve_space(xdr, 4 + 4); - nlm_compute_offsets(lock, &l_offset, &l_len); - *p++ = cpu_to_be32(l_offset); - *p = cpu_to_be32(l_len); -} - -static int decode_nlm_holder(struct xdr_stream *xdr, struct nlm_res *result) -{ - struct nlm_lock *lock = &result->lock; - struct file_lock *fl = &lock->fl; - u32 exclusive, l_offset, l_len; - int error; - __be32 *p; - s32 end; - - memset(lock, 0, sizeof(*lock)); - locks_init_lock(fl); - - p = xdr_inline_decode(xdr, 4 + 4); - if (unlikely(p == NULL)) - goto out_overflow; - exclusive = be32_to_cpup(p++); - lock->svid = be32_to_cpup(p); - fl->fl_pid = (pid_t)lock->svid; - - error = decode_netobj(xdr, &lock->oh); - if (unlikely(error)) - goto out; - - p = xdr_inline_decode(xdr, 4 + 4); - if (unlikely(p == NULL)) - goto out_overflow; - - fl->fl_flags = FL_POSIX; - fl->fl_type = exclusive != 0 ? F_WRLCK : F_RDLCK; - l_offset = be32_to_cpup(p++); - l_len = be32_to_cpup(p); - end = l_offset + l_len - 1; - - fl->fl_start = (loff_t)l_offset; - if (l_len == 0 || end < 0) - fl->fl_end = OFFSET_MAX; - else - fl->fl_end = (loff_t)end; - error = 0; -out: - return error; -out_overflow: - print_overflow_msg(__func__, xdr); - return -EIO; -} - -/* - * string caller_name<LM_MAXSTRLEN>; - */ -static void encode_caller_name(struct xdr_stream *xdr, const char *name) -{ - /* NB: client-side does not set lock->len */ - u32 length = strlen(name); - __be32 *p; - - BUG_ON(length > NLM_MAXSTRLEN); - p = xdr_reserve_space(xdr, 4 + length); - xdr_encode_opaque(p, name, length); -} - -/* - * struct nlm_lock { - * string caller_name<LM_MAXSTRLEN>; - * netobj fh; - * netobj oh; - * int uppid; - * unsigned l_offset; - * unsigned l_len; - * }; - */ -static void encode_nlm_lock(struct xdr_stream *xdr, - const struct nlm_lock *lock) -{ - u32 l_offset, l_len; - __be32 *p; - - encode_caller_name(xdr, lock->caller); - encode_fh(xdr, &lock->fh); - encode_netobj(xdr, lock->oh.data, lock->oh.len); - - p = xdr_reserve_space(xdr, 4 + 4 + 4); - *p++ = cpu_to_be32(lock->svid); - - nlm_compute_offsets(lock, &l_offset, &l_len); - *p++ = cpu_to_be32(l_offset); - *p = cpu_to_be32(l_len); -} - - -/* - * NLMv3 XDR encode functions - * - * NLMv3 argument types are defined in Chapter 10 of The Open Group's - * "Protocols for Interworking: XNFS, Version 3W". - */ - -/* - * struct nlm_testargs { - * netobj cookie; - * bool exclusive; - * struct nlm_lock alock; - * }; - */ -static void nlm_xdr_enc_testargs(struct rpc_rqst *req, - struct xdr_stream *xdr, - const struct nlm_args *args) -{ - const struct nlm_lock *lock = &args->lock; - - encode_cookie(xdr, &args->cookie); - encode_bool(xdr, lock->fl.fl_type == F_WRLCK); - encode_nlm_lock(xdr, lock); -} - -/* - * struct nlm_lockargs { - * netobj cookie; - * bool block; - * bool exclusive; - * struct nlm_lock alock; - * bool reclaim; - * int state; - * }; - */ -static void nlm_xdr_enc_lockargs(struct rpc_rqst *req, - struct xdr_stream *xdr, - const struct nlm_args *args) -{ - const struct nlm_lock *lock = &args->lock; - - encode_cookie(xdr, &args->cookie); - encode_bool(xdr, args->block); - encode_bool(xdr, lock->fl.fl_type == F_WRLCK); - encode_nlm_lock(xdr, lock); - encode_bool(xdr, args->reclaim); - encode_int32(xdr, args->state); -} - -/* - * struct nlm_cancargs { - * netobj cookie; - * bool block; - * bool exclusive; - * struct nlm_lock alock; - * }; - */ -static void nlm_xdr_enc_cancargs(struct rpc_rqst *req, - struct xdr_stream *xdr, - const struct nlm_args *args) -{ - const struct nlm_lock *lock = &args->lock; - - encode_cookie(xdr, &args->cookie); - encode_bool(xdr, args->block); - encode_bool(xdr, lock->fl.fl_type == F_WRLCK); - encode_nlm_lock(xdr, lock); -} - -/* - * struct nlm_unlockargs { - * netobj cookie; - * struct nlm_lock alock; - * }; - */ -static void nlm_xdr_enc_unlockargs(struct rpc_rqst *req, - struct xdr_stream *xdr, - const struct nlm_args *args) -{ - const struct nlm_lock *lock = &args->lock; - - encode_cookie(xdr, &args->cookie); - encode_nlm_lock(xdr, lock); -} - -/* - * struct nlm_res { - * netobj cookie; - * nlm_stat stat; - * }; - */ -static void nlm_xdr_enc_res(struct rpc_rqst *req, - struct xdr_stream *xdr, - const struct nlm_res *result) -{ - encode_cookie(xdr, &result->cookie); - encode_nlm_stat(xdr, result->status); -} - -/* - * union nlm_testrply switch (nlm_stats stat) { - * case LCK_DENIED: - * struct nlm_holder holder; - * default: - * void; - * }; - * - * struct nlm_testres { - * netobj cookie; - * nlm_testrply test_stat; - * }; - */ -static void encode_nlm_testrply(struct xdr_stream *xdr, - const struct nlm_res *result) -{ - if (result->status == nlm_lck_denied) - encode_nlm_holder(xdr, result); -} - -static void nlm_xdr_enc_testres(struct rpc_rqst *req, - struct xdr_stream *xdr, - const struct nlm_res *result) -{ - encode_cookie(xdr, &result->cookie); - encode_nlm_stat(xdr, result->status); - encode_nlm_testrply(xdr, result); -} - - -/* - * NLMv3 XDR decode functions - * - * NLMv3 result types are defined in Chapter 10 of The Open Group's - * "Protocols for Interworking: XNFS, Version 3W". - */ - -/* - * union nlm_testrply switch (nlm_stats stat) { - * case LCK_DENIED: - * struct nlm_holder holder; - * default: - * void; - * }; - * - * struct nlm_testres { - * netobj cookie; - * nlm_testrply test_stat; - * }; - */ -static int decode_nlm_testrply(struct xdr_stream *xdr, - struct nlm_res *result) -{ - int error; - - error = decode_nlm_stat(xdr, &result->status); - if (unlikely(error)) - goto out; - if (result->status == nlm_lck_denied) - error = decode_nlm_holder(xdr, result); -out: - return error; -} - -static int nlm_xdr_dec_testres(struct rpc_rqst *req, - struct xdr_stream *xdr, - struct nlm_res *result) -{ - int error; - - error = decode_cookie(xdr, &result->cookie); - if (unlikely(error)) - goto out; - error = decode_nlm_testrply(xdr, result); -out: - return error; -} - -/* - * struct nlm_res { - * netobj cookie; - * nlm_stat stat; - * }; - */ -static int nlm_xdr_dec_res(struct rpc_rqst *req, - struct xdr_stream *xdr, - struct nlm_res *result) -{ - int error; - - error = decode_cookie(xdr, &result->cookie); - if (unlikely(error)) - goto out; - error = decode_nlm_stat(xdr, &result->status); -out: - return error; -} - - -/* - * For NLM, a void procedure really returns nothing - */ -#define nlm_xdr_dec_norep NULL - -#define PROC(proc, argtype, restype) \ -[NLMPROC_##proc] = { \ - .p_proc = NLMPROC_##proc, \ - .p_encode = (kxdreproc_t)nlm_xdr_enc_##argtype, \ - .p_decode = (kxdrdproc_t)nlm_xdr_dec_##restype, \ - .p_arglen = NLM_##argtype##_sz, \ - .p_replen = NLM_##restype##_sz, \ - .p_statidx = NLMPROC_##proc, \ - .p_name = #proc, \ - } - -static struct rpc_procinfo nlm_procedures[] = { - PROC(TEST, testargs, testres), - PROC(LOCK, lockargs, res), - PROC(CANCEL, cancargs, res), - PROC(UNLOCK, unlockargs, res), - PROC(GRANTED, testargs, res), - PROC(TEST_MSG, testargs, norep), - PROC(LOCK_MSG, lockargs, norep), - PROC(CANCEL_MSG, cancargs, norep), - PROC(UNLOCK_MSG, unlockargs, norep), - PROC(GRANTED_MSG, testargs, norep), - PROC(TEST_RES, testres, norep), - PROC(LOCK_RES, res, norep), - PROC(CANCEL_RES, res, norep), - PROC(UNLOCK_RES, res, norep), - PROC(GRANTED_RES, res, norep), -}; - -static const struct rpc_version nlm_version1 = { - .number = 1, - .nrprocs = ARRAY_SIZE(nlm_procedures), - .procs = nlm_procedures, -}; - -static const struct rpc_version nlm_version3 = { - .number = 3, - .nrprocs = ARRAY_SIZE(nlm_procedures), - .procs = nlm_procedures, -}; - -static const struct rpc_version *nlm_versions[] = { - [1] = &nlm_version1, - [3] = &nlm_version3, -#ifdef CONFIG_LOCKD_V4 - [4] = &nlm_version4, -#endif -}; - -static struct rpc_stat nlm_rpc_stats; - -const struct rpc_program nlm_program = { - .name = "lockd", - .number = NLM_PROGRAM, - .nrvers = ARRAY_SIZE(nlm_versions), - .version = nlm_versions, - .stats = &nlm_rpc_stats, -}; |