diff options
Diffstat (limited to 'ANDROID_3.4.5/fs/nfsd/nfs4callback.c')
| -rw-r--r-- | ANDROID_3.4.5/fs/nfsd/nfs4callback.c | 1037 |
1 files changed, 0 insertions, 1037 deletions
diff --git a/ANDROID_3.4.5/fs/nfsd/nfs4callback.c b/ANDROID_3.4.5/fs/nfsd/nfs4callback.c deleted file mode 100644 index c8e9f637..00000000 --- a/ANDROID_3.4.5/fs/nfsd/nfs4callback.c +++ /dev/null @@ -1,1037 +0,0 @@ -/* - * Copyright (c) 2001 The Regents of the University of Michigan. - * All rights reserved. - * - * Kendrick Smith <kmsmith@umich.edu> - * Andy Adamson <andros@umich.edu> - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. Neither the name of the University nor the names of its - * contributors may be used to endorse or promote products derived - * from this software without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED - * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF - * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE - * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR - * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF - * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR - * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF - * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING - * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS - * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - */ - -#include <linux/sunrpc/clnt.h> -#include <linux/sunrpc/svc_xprt.h> -#include <linux/slab.h> -#include "nfsd.h" -#include "state.h" - -#define NFSDDBG_FACILITY NFSDDBG_PROC - -static void nfsd4_mark_cb_fault(struct nfs4_client *, int reason); - -#define NFSPROC4_CB_NULL 0 -#define NFSPROC4_CB_COMPOUND 1 - -/* Index of predefined Linux callback client operations */ - -enum { - NFSPROC4_CLNT_CB_NULL = 0, - NFSPROC4_CLNT_CB_RECALL, - NFSPROC4_CLNT_CB_SEQUENCE, -}; - -#define NFS4_MAXTAGLEN 20 - -#define NFS4_enc_cb_null_sz 0 -#define NFS4_dec_cb_null_sz 0 -#define cb_compound_enc_hdr_sz 4 -#define cb_compound_dec_hdr_sz (3 + (NFS4_MAXTAGLEN >> 2)) -#define sessionid_sz (NFS4_MAX_SESSIONID_LEN >> 2) -#define cb_sequence_enc_sz (sessionid_sz + 4 + \ - 1 /* no referring calls list yet */) -#define cb_sequence_dec_sz (op_dec_sz + sessionid_sz + 4) - -#define op_enc_sz 1 -#define op_dec_sz 2 -#define enc_nfs4_fh_sz (1 + (NFS4_FHSIZE >> 2)) -#define enc_stateid_sz (NFS4_STATEID_SIZE >> 2) -#define NFS4_enc_cb_recall_sz (cb_compound_enc_hdr_sz + \ - cb_sequence_enc_sz + \ - 1 + enc_stateid_sz + \ - enc_nfs4_fh_sz) - -#define NFS4_dec_cb_recall_sz (cb_compound_dec_hdr_sz + \ - cb_sequence_dec_sz + \ - op_dec_sz) - -struct nfs4_cb_compound_hdr { - /* args */ - u32 ident; /* minorversion 0 only */ - u32 nops; - __be32 *nops_p; - u32 minorversion; - /* res */ - int status; -}; - -/* - * Handle decode buffer overflows out-of-line. - */ -static void print_overflow_msg(const char *func, const struct xdr_stream *xdr) -{ - dprintk("NFS: %s prematurely hit the end of our receive buffer. " - "Remaining buffer length is %tu words.\n", - func, xdr->end - xdr->p); -} - -static __be32 *xdr_encode_empty_array(__be32 *p) -{ - *p++ = xdr_zero; - return p; -} - -/* - * Encode/decode NFSv4 CB basic data types - * - * Basic NFSv4 callback data types are defined in section 15 of RFC - * 3530: "Network File System (NFS) version 4 Protocol" and section - * 20 of RFC 5661: "Network File System (NFS) Version 4 Minor Version - * 1 Protocol" - */ - -/* - * nfs_cb_opnum4 - * - * enum nfs_cb_opnum4 { - * OP_CB_GETATTR = 3, - * ... - * }; - */ -enum nfs_cb_opnum4 { - OP_CB_GETATTR = 3, - OP_CB_RECALL = 4, - OP_CB_LAYOUTRECALL = 5, - OP_CB_NOTIFY = 6, - OP_CB_PUSH_DELEG = 7, - OP_CB_RECALL_ANY = 8, - OP_CB_RECALLABLE_OBJ_AVAIL = 9, - OP_CB_RECALL_SLOT = 10, - OP_CB_SEQUENCE = 11, - OP_CB_WANTS_CANCELLED = 12, - OP_CB_NOTIFY_LOCK = 13, - OP_CB_NOTIFY_DEVICEID = 14, - OP_CB_ILLEGAL = 10044 -}; - -static void encode_nfs_cb_opnum4(struct xdr_stream *xdr, enum nfs_cb_opnum4 op) -{ - __be32 *p; - - p = xdr_reserve_space(xdr, 4); - *p = cpu_to_be32(op); -} - -/* - * nfs_fh4 - * - * typedef opaque nfs_fh4<NFS4_FHSIZE>; - */ -static void encode_nfs_fh4(struct xdr_stream *xdr, const struct knfsd_fh *fh) -{ - u32 length = fh->fh_size; - __be32 *p; - - BUG_ON(length > NFS4_FHSIZE); - p = xdr_reserve_space(xdr, 4 + length); - xdr_encode_opaque(p, &fh->fh_base, length); -} - -/* - * stateid4 - * - * struct stateid4 { - * uint32_t seqid; - * opaque other[12]; - * }; - */ -static void encode_stateid4(struct xdr_stream *xdr, const stateid_t *sid) -{ - __be32 *p; - - p = xdr_reserve_space(xdr, NFS4_STATEID_SIZE); - *p++ = cpu_to_be32(sid->si_generation); - xdr_encode_opaque_fixed(p, &sid->si_opaque, NFS4_STATEID_OTHER_SIZE); -} - -/* - * sessionid4 - * - * typedef opaque sessionid4[NFS4_SESSIONID_SIZE]; - */ -static void encode_sessionid4(struct xdr_stream *xdr, - const struct nfsd4_session *session) -{ - __be32 *p; - - p = xdr_reserve_space(xdr, NFS4_MAX_SESSIONID_LEN); - xdr_encode_opaque_fixed(p, session->se_sessionid.data, - NFS4_MAX_SESSIONID_LEN); -} - -/* - * nfsstat4 - */ -static const struct { - int stat; - int errno; -} nfs_cb_errtbl[] = { - { NFS4_OK, 0 }, - { NFS4ERR_PERM, -EPERM }, - { NFS4ERR_NOENT, -ENOENT }, - { NFS4ERR_IO, -EIO }, - { NFS4ERR_NXIO, -ENXIO }, - { NFS4ERR_ACCESS, -EACCES }, - { NFS4ERR_EXIST, -EEXIST }, - { NFS4ERR_XDEV, -EXDEV }, - { NFS4ERR_NOTDIR, -ENOTDIR }, - { NFS4ERR_ISDIR, -EISDIR }, - { NFS4ERR_INVAL, -EINVAL }, - { NFS4ERR_FBIG, -EFBIG }, - { NFS4ERR_NOSPC, -ENOSPC }, - { NFS4ERR_ROFS, -EROFS }, - { NFS4ERR_MLINK, -EMLINK }, - { NFS4ERR_NAMETOOLONG, -ENAMETOOLONG }, - { NFS4ERR_NOTEMPTY, -ENOTEMPTY }, - { NFS4ERR_DQUOT, -EDQUOT }, - { NFS4ERR_STALE, -ESTALE }, - { NFS4ERR_BADHANDLE, -EBADHANDLE }, - { NFS4ERR_BAD_COOKIE, -EBADCOOKIE }, - { NFS4ERR_NOTSUPP, -ENOTSUPP }, - { NFS4ERR_TOOSMALL, -ETOOSMALL }, - { NFS4ERR_SERVERFAULT, -ESERVERFAULT }, - { NFS4ERR_BADTYPE, -EBADTYPE }, - { NFS4ERR_LOCKED, -EAGAIN }, - { NFS4ERR_RESOURCE, -EREMOTEIO }, - { NFS4ERR_SYMLINK, -ELOOP }, - { NFS4ERR_OP_ILLEGAL, -EOPNOTSUPP }, - { NFS4ERR_DEADLOCK, -EDEADLK }, - { -1, -EIO } -}; - -/* - * If we cannot translate the error, the recovery routines should - * handle it. - * - * Note: remaining NFSv4 error codes have values > 10000, so should - * not conflict with native Linux error codes. - */ -static int nfs_cb_stat_to_errno(int status) -{ - int i; - - for (i = 0; nfs_cb_errtbl[i].stat != -1; i++) { - if (nfs_cb_errtbl[i].stat == status) - return nfs_cb_errtbl[i].errno; - } - - dprintk("NFSD: Unrecognized NFS CB status value: %u\n", status); - return -status; -} - -static int decode_cb_op_status(struct xdr_stream *xdr, enum nfs_opnum4 expected, - enum nfsstat4 *status) -{ - __be32 *p; - u32 op; - - p = xdr_inline_decode(xdr, 4 + 4); - if (unlikely(p == NULL)) - goto out_overflow; - op = be32_to_cpup(p++); - if (unlikely(op != expected)) - goto out_unexpected; - *status = be32_to_cpup(p); - return 0; -out_overflow: - print_overflow_msg(__func__, xdr); - return -EIO; -out_unexpected: - dprintk("NFSD: Callback server returned operation %d but " - "we issued a request for %d\n", op, expected); - return -EIO; -} - -/* - * CB_COMPOUND4args - * - * struct CB_COMPOUND4args { - * utf8str_cs tag; - * uint32_t minorversion; - * uint32_t callback_ident; - * nfs_cb_argop4 argarray<>; - * }; -*/ -static void encode_cb_compound4args(struct xdr_stream *xdr, - struct nfs4_cb_compound_hdr *hdr) -{ - __be32 * p; - - p = xdr_reserve_space(xdr, 4 + 4 + 4 + 4); - p = xdr_encode_empty_array(p); /* empty tag */ - *p++ = cpu_to_be32(hdr->minorversion); - *p++ = cpu_to_be32(hdr->ident); - - hdr->nops_p = p; - *p = cpu_to_be32(hdr->nops); /* argarray element count */ -} - -/* - * Update argarray element count - */ -static void encode_cb_nops(struct nfs4_cb_compound_hdr *hdr) -{ - BUG_ON(hdr->nops > NFS4_MAX_BACK_CHANNEL_OPS); - *hdr->nops_p = cpu_to_be32(hdr->nops); -} - -/* - * CB_COMPOUND4res - * - * struct CB_COMPOUND4res { - * nfsstat4 status; - * utf8str_cs tag; - * nfs_cb_resop4 resarray<>; - * }; - */ -static int decode_cb_compound4res(struct xdr_stream *xdr, - struct nfs4_cb_compound_hdr *hdr) -{ - u32 length; - __be32 *p; - - p = xdr_inline_decode(xdr, 4 + 4); - if (unlikely(p == NULL)) - goto out_overflow; - hdr->status = be32_to_cpup(p++); - /* Ignore the tag */ - length = be32_to_cpup(p++); - p = xdr_inline_decode(xdr, length + 4); - if (unlikely(p == NULL)) - goto out_overflow; - hdr->nops = be32_to_cpup(p); - return 0; -out_overflow: - print_overflow_msg(__func__, xdr); - return -EIO; -} - -/* - * CB_RECALL4args - * - * struct CB_RECALL4args { - * stateid4 stateid; - * bool truncate; - * nfs_fh4 fh; - * }; - */ -static void encode_cb_recall4args(struct xdr_stream *xdr, - const struct nfs4_delegation *dp, - struct nfs4_cb_compound_hdr *hdr) -{ - __be32 *p; - - encode_nfs_cb_opnum4(xdr, OP_CB_RECALL); - encode_stateid4(xdr, &dp->dl_stid.sc_stateid); - - p = xdr_reserve_space(xdr, 4); - *p++ = xdr_zero; /* truncate */ - - encode_nfs_fh4(xdr, &dp->dl_fh); - - hdr->nops++; -} - -/* - * CB_SEQUENCE4args - * - * struct CB_SEQUENCE4args { - * sessionid4 csa_sessionid; - * sequenceid4 csa_sequenceid; - * slotid4 csa_slotid; - * slotid4 csa_highest_slotid; - * bool csa_cachethis; - * referring_call_list4 csa_referring_call_lists<>; - * }; - */ -static void encode_cb_sequence4args(struct xdr_stream *xdr, - const struct nfsd4_callback *cb, - struct nfs4_cb_compound_hdr *hdr) -{ - struct nfsd4_session *session = cb->cb_clp->cl_cb_session; - __be32 *p; - - if (hdr->minorversion == 0) - return; - - encode_nfs_cb_opnum4(xdr, OP_CB_SEQUENCE); - encode_sessionid4(xdr, session); - - p = xdr_reserve_space(xdr, 4 + 4 + 4 + 4 + 4); - *p++ = cpu_to_be32(session->se_cb_seq_nr); /* csa_sequenceid */ - *p++ = xdr_zero; /* csa_slotid */ - *p++ = xdr_zero; /* csa_highest_slotid */ - *p++ = xdr_zero; /* csa_cachethis */ - xdr_encode_empty_array(p); /* csa_referring_call_lists */ - - hdr->nops++; -} - -/* - * CB_SEQUENCE4resok - * - * struct CB_SEQUENCE4resok { - * sessionid4 csr_sessionid; - * sequenceid4 csr_sequenceid; - * slotid4 csr_slotid; - * slotid4 csr_highest_slotid; - * slotid4 csr_target_highest_slotid; - * }; - * - * union CB_SEQUENCE4res switch (nfsstat4 csr_status) { - * case NFS4_OK: - * CB_SEQUENCE4resok csr_resok4; - * default: - * void; - * }; - * - * Our current back channel implmentation supports a single backchannel - * with a single slot. - */ -static int decode_cb_sequence4resok(struct xdr_stream *xdr, - struct nfsd4_callback *cb) -{ - struct nfsd4_session *session = cb->cb_clp->cl_cb_session; - struct nfs4_sessionid id; - int status; - __be32 *p; - u32 dummy; - - status = -ESERVERFAULT; - - /* - * If the server returns different values for sessionID, slotID or - * sequence number, the server is looney tunes. - */ - p = xdr_inline_decode(xdr, NFS4_MAX_SESSIONID_LEN + 4 + 4 + 4 + 4); - if (unlikely(p == NULL)) - goto out_overflow; - memcpy(id.data, p, NFS4_MAX_SESSIONID_LEN); - if (memcmp(id.data, session->se_sessionid.data, - NFS4_MAX_SESSIONID_LEN) != 0) { - dprintk("NFS: %s Invalid session id\n", __func__); - goto out; - } - p += XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN); - - dummy = be32_to_cpup(p++); - if (dummy != session->se_cb_seq_nr) { - dprintk("NFS: %s Invalid sequence number\n", __func__); - goto out; - } - - dummy = be32_to_cpup(p++); - if (dummy != 0) { - dprintk("NFS: %s Invalid slotid\n", __func__); - goto out; - } - - /* - * FIXME: process highest slotid and target highest slotid - */ - status = 0; -out: - if (status) - nfsd4_mark_cb_fault(cb->cb_clp, status); - return status; -out_overflow: - print_overflow_msg(__func__, xdr); - return -EIO; -} - -static int decode_cb_sequence4res(struct xdr_stream *xdr, - struct nfsd4_callback *cb) -{ - enum nfsstat4 nfserr; - int status; - - if (cb->cb_minorversion == 0) - return 0; - - status = decode_cb_op_status(xdr, OP_CB_SEQUENCE, &nfserr); - if (unlikely(status)) - goto out; - if (unlikely(nfserr != NFS4_OK)) - goto out_default; - status = decode_cb_sequence4resok(xdr, cb); -out: - return status; -out_default: - return nfs_cb_stat_to_errno(nfserr); -} - -/* - * NFSv4.0 and NFSv4.1 XDR encode functions - * - * NFSv4.0 callback argument types are defined in section 15 of RFC - * 3530: "Network File System (NFS) version 4 Protocol" and section 20 - * of RFC 5661: "Network File System (NFS) Version 4 Minor Version 1 - * Protocol". - */ - -/* - * NB: Without this zero space reservation, callbacks over krb5p fail - */ -static void nfs4_xdr_enc_cb_null(struct rpc_rqst *req, struct xdr_stream *xdr, - void *__unused) -{ - xdr_reserve_space(xdr, 0); -} - -/* - * 20.2. Operation 4: CB_RECALL - Recall a Delegation - */ -static void nfs4_xdr_enc_cb_recall(struct rpc_rqst *req, struct xdr_stream *xdr, - const struct nfsd4_callback *cb) -{ - const struct nfs4_delegation *args = cb->cb_op; - struct nfs4_cb_compound_hdr hdr = { - .ident = cb->cb_clp->cl_cb_ident, - .minorversion = cb->cb_minorversion, - }; - - encode_cb_compound4args(xdr, &hdr); - encode_cb_sequence4args(xdr, cb, &hdr); - encode_cb_recall4args(xdr, args, &hdr); - encode_cb_nops(&hdr); -} - - -/* - * NFSv4.0 and NFSv4.1 XDR decode functions - * - * NFSv4.0 callback result types are defined in section 15 of RFC - * 3530: "Network File System (NFS) version 4 Protocol" and section 20 - * of RFC 5661: "Network File System (NFS) Version 4 Minor Version 1 - * Protocol". - */ - -static int nfs4_xdr_dec_cb_null(struct rpc_rqst *req, struct xdr_stream *xdr, - void *__unused) -{ - return 0; -} - -/* - * 20.2. Operation 4: CB_RECALL - Recall a Delegation - */ -static int nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp, - struct xdr_stream *xdr, - struct nfsd4_callback *cb) -{ - struct nfs4_cb_compound_hdr hdr; - enum nfsstat4 nfserr; - int status; - - status = decode_cb_compound4res(xdr, &hdr); - if (unlikely(status)) - goto out; - - if (cb != NULL) { - status = decode_cb_sequence4res(xdr, cb); - if (unlikely(status)) - goto out; - } - - status = decode_cb_op_status(xdr, OP_CB_RECALL, &nfserr); - if (unlikely(status)) - goto out; - if (unlikely(nfserr != NFS4_OK)) - status = nfs_cb_stat_to_errno(nfserr); -out: - return status; -} - -/* - * RPC procedure tables - */ -#define PROC(proc, call, argtype, restype) \ -[NFSPROC4_CLNT_##proc] = { \ - .p_proc = NFSPROC4_CB_##call, \ - .p_encode = (kxdreproc_t)nfs4_xdr_enc_##argtype, \ - .p_decode = (kxdrdproc_t)nfs4_xdr_dec_##restype, \ - .p_arglen = NFS4_enc_##argtype##_sz, \ - .p_replen = NFS4_dec_##restype##_sz, \ - .p_statidx = NFSPROC4_CB_##call, \ - .p_name = #proc, \ -} - -static struct rpc_procinfo nfs4_cb_procedures[] = { - PROC(CB_NULL, NULL, cb_null, cb_null), - PROC(CB_RECALL, COMPOUND, cb_recall, cb_recall), -}; - -static struct rpc_version nfs_cb_version4 = { -/* - * Note on the callback rpc program version number: despite language in rfc - * 5661 section 18.36.3 requiring servers to use 4 in this field, the - * official xdr descriptions for both 4.0 and 4.1 specify version 1, and - * in practice that appears to be what implementations use. The section - * 18.36.3 language is expected to be fixed in an erratum. - */ - .number = 1, - .nrprocs = ARRAY_SIZE(nfs4_cb_procedures), - .procs = nfs4_cb_procedures -}; - -static const struct rpc_version *nfs_cb_version[] = { - &nfs_cb_version4, -}; - -static const struct rpc_program cb_program; - -static struct rpc_stat cb_stats = { - .program = &cb_program -}; - -#define NFS4_CALLBACK 0x40000000 -static const struct rpc_program cb_program = { - .name = "nfs4_cb", - .number = NFS4_CALLBACK, - .nrvers = ARRAY_SIZE(nfs_cb_version), - .version = nfs_cb_version, - .stats = &cb_stats, - .pipe_dir_name = "nfsd4_cb", -}; - -static int max_cb_time(void) -{ - return max(nfsd4_lease/10, (time_t)1) * HZ; -} - - -static int setup_callback_client(struct nfs4_client *clp, struct nfs4_cb_conn *conn, struct nfsd4_session *ses) -{ - struct rpc_timeout timeparms = { - .to_initval = max_cb_time(), - .to_retries = 0, - }; - struct rpc_create_args args = { - .net = &init_net, - .address = (struct sockaddr *) &conn->cb_addr, - .addrsize = conn->cb_addrlen, - .saddress = (struct sockaddr *) &conn->cb_saddr, - .timeout = &timeparms, - .program = &cb_program, - .version = 0, - .flags = (RPC_CLNT_CREATE_NOPING | RPC_CLNT_CREATE_QUIET), - }; - struct rpc_clnt *client; - - if (clp->cl_minorversion == 0) { - if (!clp->cl_principal && (clp->cl_flavor >= RPC_AUTH_GSS_KRB5)) - return -EINVAL; - args.client_name = clp->cl_principal; - args.prognumber = conn->cb_prog, - args.protocol = XPRT_TRANSPORT_TCP; - args.authflavor = clp->cl_flavor; - clp->cl_cb_ident = conn->cb_ident; - } else { - if (!conn->cb_xprt) - return -EINVAL; - clp->cl_cb_conn.cb_xprt = conn->cb_xprt; - clp->cl_cb_session = ses; - args.bc_xprt = conn->cb_xprt; - args.prognumber = clp->cl_cb_session->se_cb_prog; - args.protocol = XPRT_TRANSPORT_BC_TCP; - args.authflavor = RPC_AUTH_UNIX; - } - /* Create RPC client */ - client = rpc_create(&args); - if (IS_ERR(client)) { - dprintk("NFSD: couldn't create callback client: %ld\n", - PTR_ERR(client)); - return PTR_ERR(client); - } - clp->cl_cb_client = client; - return 0; - -} - -static void warn_no_callback_path(struct nfs4_client *clp, int reason) -{ - dprintk("NFSD: warning: no callback path to client %.*s: error %d\n", - (int)clp->cl_name.len, clp->cl_name.data, reason); -} - -static void nfsd4_mark_cb_down(struct nfs4_client *clp, int reason) -{ - clp->cl_cb_state = NFSD4_CB_DOWN; - warn_no_callback_path(clp, reason); -} - -static void nfsd4_mark_cb_fault(struct nfs4_client *clp, int reason) -{ - clp->cl_cb_state = NFSD4_CB_FAULT; - warn_no_callback_path(clp, reason); -} - -static void nfsd4_cb_probe_done(struct rpc_task *task, void *calldata) -{ - struct nfs4_client *clp = container_of(calldata, struct nfs4_client, cl_cb_null); - - if (task->tk_status) - nfsd4_mark_cb_down(clp, task->tk_status); - else - clp->cl_cb_state = NFSD4_CB_UP; -} - -static const struct rpc_call_ops nfsd4_cb_probe_ops = { - /* XXX: release method to ensure we set the cb channel down if - * necessary on early failure? */ - .rpc_call_done = nfsd4_cb_probe_done, -}; - -static struct rpc_cred *callback_cred; - -int set_callback_cred(void) -{ - if (callback_cred) - return 0; - callback_cred = rpc_lookup_machine_cred("nfs"); - if (!callback_cred) - return -ENOMEM; - return 0; -} - -static struct workqueue_struct *callback_wq; - -static void run_nfsd4_cb(struct nfsd4_callback *cb) -{ - queue_work(callback_wq, &cb->cb_work); -} - -static void do_probe_callback(struct nfs4_client *clp) -{ - struct nfsd4_callback *cb = &clp->cl_cb_null; - - cb->cb_op = NULL; - cb->cb_clp = clp; - - cb->cb_msg.rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_NULL]; - cb->cb_msg.rpc_argp = NULL; - cb->cb_msg.rpc_resp = NULL; - cb->cb_msg.rpc_cred = callback_cred; - - cb->cb_ops = &nfsd4_cb_probe_ops; - - run_nfsd4_cb(cb); -} - -/* - * Poke the callback thread to process any updates to the callback - * parameters, and send a null probe. - */ -void nfsd4_probe_callback(struct nfs4_client *clp) -{ - /* XXX: atomicity? Also, should we be using cl_flags? */ - clp->cl_cb_state = NFSD4_CB_UNKNOWN; - set_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags); - do_probe_callback(clp); -} - -void nfsd4_probe_callback_sync(struct nfs4_client *clp) -{ - nfsd4_probe_callback(clp); - flush_workqueue(callback_wq); -} - -void nfsd4_change_callback(struct nfs4_client *clp, struct nfs4_cb_conn *conn) -{ - clp->cl_cb_state = NFSD4_CB_UNKNOWN; - spin_lock(&clp->cl_lock); - memcpy(&clp->cl_cb_conn, conn, sizeof(struct nfs4_cb_conn)); - spin_unlock(&clp->cl_lock); -} - -/* - * There's currently a single callback channel slot. - * If the slot is available, then mark it busy. Otherwise, set the - * thread for sleeping on the callback RPC wait queue. - */ -static bool nfsd41_cb_get_slot(struct nfs4_client *clp, struct rpc_task *task) -{ - if (test_and_set_bit(0, &clp->cl_cb_slot_busy) != 0) { - rpc_sleep_on(&clp->cl_cb_waitq, task, NULL); - dprintk("%s slot is busy\n", __func__); - return false; - } - return true; -} - -/* - * TODO: cb_sequence should support referring call lists, cachethis, multiple - * slots, and mark callback channel down on communication errors. - */ -static void nfsd4_cb_prepare(struct rpc_task *task, void *calldata) -{ - struct nfsd4_callback *cb = calldata; - struct nfs4_delegation *dp = container_of(cb, struct nfs4_delegation, dl_recall); - struct nfs4_client *clp = dp->dl_stid.sc_client; - u32 minorversion = clp->cl_minorversion; - - cb->cb_minorversion = minorversion; - if (minorversion) { - if (!nfsd41_cb_get_slot(clp, task)) - return; - } - spin_lock(&clp->cl_lock); - if (list_empty(&cb->cb_per_client)) { - /* This is the first call, not a restart */ - cb->cb_done = false; - list_add(&cb->cb_per_client, &clp->cl_callbacks); - } - spin_unlock(&clp->cl_lock); - rpc_call_start(task); -} - -static void nfsd4_cb_done(struct rpc_task *task, void *calldata) -{ - struct nfsd4_callback *cb = calldata; - struct nfs4_delegation *dp = container_of(cb, struct nfs4_delegation, dl_recall); - struct nfs4_client *clp = dp->dl_stid.sc_client; - - dprintk("%s: minorversion=%d\n", __func__, - clp->cl_minorversion); - - if (clp->cl_minorversion) { - /* No need for lock, access serialized in nfsd4_cb_prepare */ - ++clp->cl_cb_session->se_cb_seq_nr; - clear_bit(0, &clp->cl_cb_slot_busy); - rpc_wake_up_next(&clp->cl_cb_waitq); - dprintk("%s: freed slot, new seqid=%d\n", __func__, - clp->cl_cb_session->se_cb_seq_nr); - - /* We're done looking into the sequence information */ - task->tk_msg.rpc_resp = NULL; - } -} - - -static void nfsd4_cb_recall_done(struct rpc_task *task, void *calldata) -{ - struct nfsd4_callback *cb = calldata; - struct nfs4_delegation *dp = container_of(cb, struct nfs4_delegation, dl_recall); - struct nfs4_client *clp = dp->dl_stid.sc_client; - struct rpc_clnt *current_rpc_client = clp->cl_cb_client; - - nfsd4_cb_done(task, calldata); - - if (current_rpc_client != task->tk_client) { - /* We're shutting down or changing cl_cb_client; leave - * it to nfsd4_process_cb_update to restart the call if - * necessary. */ - return; - } - - if (cb->cb_done) - return; - switch (task->tk_status) { - case 0: - cb->cb_done = true; - return; - case -EBADHANDLE: - case -NFS4ERR_BAD_STATEID: - /* Race: client probably got cb_recall - * before open reply granting delegation */ - break; - default: - /* Network partition? */ - nfsd4_mark_cb_down(clp, task->tk_status); - } - if (dp->dl_retries--) { - rpc_delay(task, 2*HZ); - task->tk_status = 0; - rpc_restart_call_prepare(task); - return; - } - nfsd4_mark_cb_down(clp, task->tk_status); - cb->cb_done = true; -} - -static void nfsd4_cb_recall_release(void *calldata) -{ - struct nfsd4_callback *cb = calldata; - struct nfs4_client *clp = cb->cb_clp; - struct nfs4_delegation *dp = container_of(cb, struct nfs4_delegation, dl_recall); - - if (cb->cb_done) { - spin_lock(&clp->cl_lock); - list_del(&cb->cb_per_client); - spin_unlock(&clp->cl_lock); - nfs4_put_delegation(dp); - } -} - -static const struct rpc_call_ops nfsd4_cb_recall_ops = { - .rpc_call_prepare = nfsd4_cb_prepare, - .rpc_call_done = nfsd4_cb_recall_done, - .rpc_release = nfsd4_cb_recall_release, -}; - -int nfsd4_create_callback_queue(void) -{ - callback_wq = create_singlethread_workqueue("nfsd4_callbacks"); - if (!callback_wq) - return -ENOMEM; - return 0; -} - -void nfsd4_destroy_callback_queue(void) -{ - destroy_workqueue(callback_wq); -} - -/* must be called under the state lock */ -void nfsd4_shutdown_callback(struct nfs4_client *clp) -{ - set_bit(NFSD4_CLIENT_CB_KILL, &clp->cl_flags); - /* - * Note this won't actually result in a null callback; - * instead, nfsd4_do_callback_rpc() will detect the killed - * client, destroy the rpc client, and stop: - */ - do_probe_callback(clp); - flush_workqueue(callback_wq); -} - -static void nfsd4_release_cb(struct nfsd4_callback *cb) -{ - if (cb->cb_ops->rpc_release) - cb->cb_ops->rpc_release(cb); -} - -/* requires cl_lock: */ -static struct nfsd4_conn * __nfsd4_find_backchannel(struct nfs4_client *clp) -{ - struct nfsd4_session *s; - struct nfsd4_conn *c; - - list_for_each_entry(s, &clp->cl_sessions, se_perclnt) { - list_for_each_entry(c, &s->se_conns, cn_persession) { - if (c->cn_flags & NFS4_CDFC4_BACK) - return c; - } - } - return NULL; -} - -static void nfsd4_process_cb_update(struct nfsd4_callback *cb) -{ - struct nfs4_cb_conn conn; - struct nfs4_client *clp = cb->cb_clp; - struct nfsd4_session *ses = NULL; - struct nfsd4_conn *c; - int err; - - /* - * This is either an update, or the client dying; in either case, - * kill the old client: - */ - if (clp->cl_cb_client) { - rpc_shutdown_client(clp->cl_cb_client); - clp->cl_cb_client = NULL; - } - if (clp->cl_cb_conn.cb_xprt) { - svc_xprt_put(clp->cl_cb_conn.cb_xprt); - clp->cl_cb_conn.cb_xprt = NULL; - } - if (test_bit(NFSD4_CLIENT_CB_KILL, &clp->cl_flags)) - return; - spin_lock(&clp->cl_lock); - /* - * Only serialized callback code is allowed to clear these - * flags; main nfsd code can only set them: - */ - BUG_ON(!(clp->cl_flags & NFSD4_CLIENT_CB_FLAG_MASK)); - clear_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags); - memcpy(&conn, &cb->cb_clp->cl_cb_conn, sizeof(struct nfs4_cb_conn)); - c = __nfsd4_find_backchannel(clp); - if (c) { - svc_xprt_get(c->cn_xprt); - conn.cb_xprt = c->cn_xprt; - ses = c->cn_session; - } - spin_unlock(&clp->cl_lock); - - err = setup_callback_client(clp, &conn, ses); - if (err) { - nfsd4_mark_cb_down(clp, err); - return; - } - /* Yay, the callback channel's back! Restart any callbacks: */ - list_for_each_entry(cb, &clp->cl_callbacks, cb_per_client) - run_nfsd4_cb(cb); -} - -void nfsd4_do_callback_rpc(struct work_struct *w) -{ - struct nfsd4_callback *cb = container_of(w, struct nfsd4_callback, cb_work); - struct nfs4_client *clp = cb->cb_clp; - struct rpc_clnt *clnt; - - if (clp->cl_flags & NFSD4_CLIENT_CB_FLAG_MASK) - nfsd4_process_cb_update(cb); - - clnt = clp->cl_cb_client; - if (!clnt) { - /* Callback channel broken, or client killed; give up: */ - nfsd4_release_cb(cb); - return; - } - rpc_call_async(clnt, &cb->cb_msg, RPC_TASK_SOFT | RPC_TASK_SOFTCONN, - cb->cb_ops, cb); -} - -void nfsd4_cb_recall(struct nfs4_delegation *dp) -{ - struct nfsd4_callback *cb = &dp->dl_recall; - struct nfs4_client *clp = dp->dl_stid.sc_client; - - dp->dl_retries = 1; - cb->cb_op = dp; - cb->cb_clp = clp; - cb->cb_msg.rpc_proc = &nfs4_cb_procedures[NFSPROC4_CLNT_CB_RECALL]; - cb->cb_msg.rpc_argp = cb; - cb->cb_msg.rpc_resp = cb; - cb->cb_msg.rpc_cred = callback_cred; - - cb->cb_ops = &nfsd4_cb_recall_ops; - dp->dl_retries = 1; - - INIT_LIST_HEAD(&cb->cb_per_client); - cb->cb_done = true; - - run_nfsd4_cb(&dp->dl_recall); -} |