| /* |
| * 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/nfs4.h> |
| #include <linux/sunrpc/clnt.h> |
| #include <linux/sunrpc/xprt.h> |
| #include <linux/sunrpc/svc_xprt.h> |
| #include <linux/slab.h> |
| #include "nfsd.h" |
| #include "state.h" |
| #include "netns.h" |
| #include "trace.h" |
| #include "xdr4cb.h" |
| #include "xdr4.h" |
| |
| #define NFSDDBG_FACILITY NFSDDBG_PROC |
| |
| static void nfsd4_mark_cb_fault(struct nfs4_client *clp); |
| |
| #define NFSPROC4_CB_NULL 0 |
| #define NFSPROC4_CB_COMPOUND 1 |
| |
| /* Index of predefined Linux callback client operations */ |
| |
| struct nfs4_cb_compound_hdr { |
| /* args */ |
| u32 ident; /* minorversion 0 only */ |
| u32 nops; |
| __be32 *nops_p; |
| u32 minorversion; |
| /* res */ |
| int status; |
| }; |
| |
| 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" |
| */ |
| |
| static void encode_uint32(struct xdr_stream *xdr, u32 n) |
| { |
| WARN_ON_ONCE(xdr_stream_encode_u32(xdr, n) < 0); |
| } |
| |
| static void encode_bitmap4(struct xdr_stream *xdr, const __u32 *bitmap, |
| size_t len) |
| { |
| xdr_stream_encode_uint32_array(xdr, bitmap, len); |
| } |
| |
| static int decode_cb_fattr4(struct xdr_stream *xdr, uint32_t *bitmap, |
| struct nfs4_cb_fattr *fattr) |
| { |
| fattr->ncf_cb_change = 0; |
| fattr->ncf_cb_fsize = 0; |
| if (bitmap[0] & FATTR4_WORD0_CHANGE) |
| if (xdr_stream_decode_u64(xdr, &fattr->ncf_cb_change) < 0) |
| return -NFSERR_BAD_XDR; |
| if (bitmap[0] & FATTR4_WORD0_SIZE) |
| if (xdr_stream_decode_u64(xdr, &fattr->ncf_cb_fsize) < 0) |
| return -NFSERR_BAD_XDR; |
| return 0; |
| } |
| |
| 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_raw, 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_cb_opnum4 expected, int *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 = nfs_cb_stat_to_errno(be32_to_cpup(p)); |
| return 0; |
| out_overflow: |
| 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, XDR_UNIT); |
| if (unlikely(p == NULL)) |
| goto out_overflow; |
| hdr->status = be32_to_cpup(p); |
| /* Ignore the tag */ |
| if (xdr_stream_decode_u32(xdr, &length) < 0) |
| goto out_overflow; |
| if (xdr_inline_decode(xdr, length) == NULL) |
| goto out_overflow; |
| if (xdr_stream_decode_u32(xdr, &hdr->nops) < 0) |
| goto out_overflow; |
| return 0; |
| out_overflow: |
| 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_stid.sc_file->fi_fhandle); |
| |
| hdr->nops++; |
| } |
| |
| /* |
| * CB_RECALLANY4args |
| * |
| * struct CB_RECALLANY4args { |
| * uint32_t craa_objects_to_keep; |
| * bitmap4 craa_type_mask; |
| * }; |
| */ |
| static void |
| encode_cb_recallany4args(struct xdr_stream *xdr, |
| struct nfs4_cb_compound_hdr *hdr, struct nfsd4_cb_recall_any *ra) |
| { |
| encode_nfs_cb_opnum4(xdr, OP_CB_RECALL_ANY); |
| encode_uint32(xdr, ra->ra_keep); |
| encode_bitmap4(xdr, ra->ra_bmval, ARRAY_SIZE(ra->ra_bmval)); |
| hdr->nops++; |
| } |
| |
| /* |
| * CB_GETATTR4args |
| * struct CB_GETATTR4args { |
| * nfs_fh4 fh; |
| * bitmap4 attr_request; |
| * }; |
| * |
| * The size and change attributes are the only one |
| * guaranteed to be serviced by the client. |
| */ |
| static void |
| encode_cb_getattr4args(struct xdr_stream *xdr, struct nfs4_cb_compound_hdr *hdr, |
| struct nfs4_cb_fattr *fattr) |
| { |
| struct nfs4_delegation *dp = |
| container_of(fattr, struct nfs4_delegation, dl_cb_fattr); |
| struct knfsd_fh *fh = &dp->dl_stid.sc_file->fi_fhandle; |
| u32 bmap[1]; |
| |
| bmap[0] = FATTR4_WORD0_CHANGE | FATTR4_WORD0_SIZE; |
| |
| encode_nfs_cb_opnum4(xdr, OP_CB_GETATTR); |
| encode_nfs_fh4(xdr, fh); |
| encode_bitmap4(xdr, bmap, ARRAY_SIZE(bmap)); |
| hdr->nops++; |
| } |
| |
| static u32 highest_slotid(struct nfsd4_session *ses) |
| { |
| u32 idx; |
| |
| spin_lock(&ses->se_lock); |
| idx = fls(~ses->se_cb_slot_avail); |
| if (idx > 0) |
| --idx; |
| idx = max(idx, ses->se_cb_highest_slot); |
| spin_unlock(&ses->se_lock); |
| return idx; |
| } |
| |
| /* |
| * 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[cb->cb_held_slot]); /* csa_sequenceid */ |
| *p++ = cpu_to_be32(cb->cb_held_slot); /* csa_slotid */ |
| *p++ = cpu_to_be32(highest_slotid(session)); /* csa_highest_slotid */ |
| *p++ = xdr_zero; /* csa_cachethis */ |
| xdr_encode_empty_array(p); /* csa_referring_call_lists */ |
| |
| hdr->nops++; |
| } |
| |
| static void update_cb_slot_table(struct nfsd4_session *ses, u32 target) |
| { |
| /* No need to do anything if nothing changed */ |
| if (likely(target == READ_ONCE(ses->se_cb_highest_slot))) |
| return; |
| |
| spin_lock(&ses->se_lock); |
| if (target > ses->se_cb_highest_slot) { |
| int i; |
| |
| target = min(target, NFSD_BC_SLOT_TABLE_SIZE - 1); |
| |
| /* |
| * Growing the slot table. Reset any new sequences to 1. |
| * |
| * NB: There is some debate about whether the RFC requires this, |
| * but the Linux client expects it. |
| */ |
| for (i = ses->se_cb_highest_slot + 1; i <= target; ++i) |
| ses->se_cb_seq_nr[i] = 1; |
| } |
| ses->se_cb_highest_slot = target; |
| spin_unlock(&ses->se_lock); |
| } |
| |
| /* |
| * 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; |
| int status = -ESERVERFAULT; |
| __be32 *p; |
| u32 seqid, slotid, target; |
| |
| /* |
| * 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; |
| |
| if (memcmp(p, session->se_sessionid.data, NFS4_MAX_SESSIONID_LEN)) { |
| dprintk("NFS: %s Invalid session id\n", __func__); |
| goto out; |
| } |
| p += XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN); |
| |
| seqid = be32_to_cpup(p++); |
| if (seqid != session->se_cb_seq_nr[cb->cb_held_slot]) { |
| dprintk("NFS: %s Invalid sequence number\n", __func__); |
| goto out; |
| } |
| |
| slotid = be32_to_cpup(p++); |
| if (slotid != cb->cb_held_slot) { |
| dprintk("NFS: %s Invalid slotid\n", __func__); |
| goto out; |
| } |
| |
| p++; // ignore current highest slot value |
| |
| target = be32_to_cpup(p++); |
| update_cb_slot_table(session, target); |
| status = 0; |
| out: |
| cb->cb_seq_status = status; |
| return status; |
| out_overflow: |
| status = -EIO; |
| goto out; |
| } |
| |
| static int decode_cb_sequence4res(struct xdr_stream *xdr, |
| struct nfsd4_callback *cb) |
| { |
| int status; |
| |
| if (cb->cb_clp->cl_minorversion == 0) |
| return 0; |
| |
| status = decode_cb_op_status(xdr, OP_CB_SEQUENCE, &cb->cb_seq_status); |
| if (unlikely(status || cb->cb_seq_status)) |
| return status; |
| |
| return decode_cb_sequence4resok(xdr, cb); |
| } |
| |
| /* |
| * 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, |
| const void *__unused) |
| { |
| xdr_reserve_space(xdr, 0); |
| } |
| |
| /* |
| * 20.1. Operation 3: CB_GETATTR - Get Attributes |
| */ |
| static void nfs4_xdr_enc_cb_getattr(struct rpc_rqst *req, |
| struct xdr_stream *xdr, const void *data) |
| { |
| const struct nfsd4_callback *cb = data; |
| struct nfs4_cb_fattr *ncf = |
| container_of(cb, struct nfs4_cb_fattr, ncf_getattr); |
| struct nfs4_cb_compound_hdr hdr = { |
| .ident = cb->cb_clp->cl_cb_ident, |
| .minorversion = cb->cb_clp->cl_minorversion, |
| }; |
| |
| encode_cb_compound4args(xdr, &hdr); |
| encode_cb_sequence4args(xdr, cb, &hdr); |
| encode_cb_getattr4args(xdr, &hdr, ncf); |
| encode_cb_nops(&hdr); |
| } |
| |
| /* |
| * 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 void *data) |
| { |
| const struct nfsd4_callback *cb = data; |
| const struct nfs4_delegation *dp = cb_to_delegation(cb); |
| struct nfs4_cb_compound_hdr hdr = { |
| .ident = cb->cb_clp->cl_cb_ident, |
| .minorversion = cb->cb_clp->cl_minorversion, |
| }; |
| |
| encode_cb_compound4args(xdr, &hdr); |
| encode_cb_sequence4args(xdr, cb, &hdr); |
| encode_cb_recall4args(xdr, dp, &hdr); |
| encode_cb_nops(&hdr); |
| } |
| |
| /* |
| * 20.6. Operation 8: CB_RECALL_ANY - Keep Any N Recallable Objects |
| */ |
| static void |
| nfs4_xdr_enc_cb_recall_any(struct rpc_rqst *req, |
| struct xdr_stream *xdr, const void *data) |
| { |
| const struct nfsd4_callback *cb = data; |
| struct nfsd4_cb_recall_any *ra; |
| struct nfs4_cb_compound_hdr hdr = { |
| .ident = cb->cb_clp->cl_cb_ident, |
| .minorversion = cb->cb_clp->cl_minorversion, |
| }; |
| |
| ra = container_of(cb, struct nfsd4_cb_recall_any, ra_cb); |
| encode_cb_compound4args(xdr, &hdr); |
| encode_cb_sequence4args(xdr, cb, &hdr); |
| encode_cb_recallany4args(xdr, &hdr, ra); |
| 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; |
| } |
| |
| /* |
| * 20.1. Operation 3: CB_GETATTR - Get Attributes |
| */ |
| static int nfs4_xdr_dec_cb_getattr(struct rpc_rqst *rqstp, |
| struct xdr_stream *xdr, |
| void *data) |
| { |
| struct nfsd4_callback *cb = data; |
| struct nfs4_cb_compound_hdr hdr; |
| int status; |
| u32 bitmap[3] = {0}; |
| u32 attrlen; |
| struct nfs4_cb_fattr *ncf = |
| container_of(cb, struct nfs4_cb_fattr, ncf_getattr); |
| |
| status = decode_cb_compound4res(xdr, &hdr); |
| if (unlikely(status)) |
| return status; |
| |
| status = decode_cb_sequence4res(xdr, cb); |
| if (unlikely(status || cb->cb_seq_status)) |
| return status; |
| |
| status = decode_cb_op_status(xdr, OP_CB_GETATTR, &cb->cb_status); |
| if (status) |
| return status; |
| if (xdr_stream_decode_uint32_array(xdr, bitmap, 3) < 0) |
| return -NFSERR_BAD_XDR; |
| if (xdr_stream_decode_u32(xdr, &attrlen) < 0) |
| return -NFSERR_BAD_XDR; |
| if (attrlen > (sizeof(ncf->ncf_cb_change) + sizeof(ncf->ncf_cb_fsize))) |
| return -NFSERR_BAD_XDR; |
| status = decode_cb_fattr4(xdr, bitmap, ncf); |
| return status; |
| } |
| |
| /* |
| * 20.2. Operation 4: CB_RECALL - Recall a Delegation |
| */ |
| static int nfs4_xdr_dec_cb_recall(struct rpc_rqst *rqstp, |
| struct xdr_stream *xdr, |
| void *data) |
| { |
| struct nfsd4_callback *cb = data; |
| struct nfs4_cb_compound_hdr hdr; |
| int status; |
| |
| status = decode_cb_compound4res(xdr, &hdr); |
| if (unlikely(status)) |
| return status; |
| |
| status = decode_cb_sequence4res(xdr, cb); |
| if (unlikely(status || cb->cb_seq_status)) |
| return status; |
| |
| return decode_cb_op_status(xdr, OP_CB_RECALL, &cb->cb_status); |
| } |
| |
| /* |
| * 20.6. Operation 8: CB_RECALL_ANY - Keep Any N Recallable Objects |
| */ |
| static int |
| nfs4_xdr_dec_cb_recall_any(struct rpc_rqst *rqstp, |
| struct xdr_stream *xdr, |
| void *data) |
| { |
| struct nfsd4_callback *cb = data; |
| struct nfs4_cb_compound_hdr hdr; |
| int status; |
| |
| status = decode_cb_compound4res(xdr, &hdr); |
| if (unlikely(status)) |
| return status; |
| status = decode_cb_sequence4res(xdr, cb); |
| if (unlikely(status || cb->cb_seq_status)) |
| return status; |
| status = decode_cb_op_status(xdr, OP_CB_RECALL_ANY, &cb->cb_status); |
| return status; |
| } |
| |
| #ifdef CONFIG_NFSD_PNFS |
| /* |
| * CB_LAYOUTRECALL4args |
| * |
| * struct layoutrecall_file4 { |
| * nfs_fh4 lor_fh; |
| * offset4 lor_offset; |
| * length4 lor_length; |
| * stateid4 lor_stateid; |
| * }; |
| * |
| * union layoutrecall4 switch(layoutrecall_type4 lor_recalltype) { |
| * case LAYOUTRECALL4_FILE: |
| * layoutrecall_file4 lor_layout; |
| * case LAYOUTRECALL4_FSID: |
| * fsid4 lor_fsid; |
| * case LAYOUTRECALL4_ALL: |
| * void; |
| * }; |
| * |
| * struct CB_LAYOUTRECALL4args { |
| * layouttype4 clora_type; |
| * layoutiomode4 clora_iomode; |
| * bool clora_changed; |
| * layoutrecall4 clora_recall; |
| * }; |
| */ |
| static void encode_cb_layout4args(struct xdr_stream *xdr, |
| const struct nfs4_layout_stateid *ls, |
| struct nfs4_cb_compound_hdr *hdr) |
| { |
| __be32 *p; |
| |
| BUG_ON(hdr->minorversion == 0); |
| |
| p = xdr_reserve_space(xdr, 5 * 4); |
| *p++ = cpu_to_be32(OP_CB_LAYOUTRECALL); |
| *p++ = cpu_to_be32(ls->ls_layout_type); |
| *p++ = cpu_to_be32(IOMODE_ANY); |
| *p++ = cpu_to_be32(1); |
| *p = cpu_to_be32(RETURN_FILE); |
| |
| encode_nfs_fh4(xdr, &ls->ls_stid.sc_file->fi_fhandle); |
| |
| p = xdr_reserve_space(xdr, 2 * 8); |
| p = xdr_encode_hyper(p, 0); |
| xdr_encode_hyper(p, NFS4_MAX_UINT64); |
| |
| encode_stateid4(xdr, &ls->ls_recall_sid); |
| |
| hdr->nops++; |
| } |
| |
| static void nfs4_xdr_enc_cb_layout(struct rpc_rqst *req, |
| struct xdr_stream *xdr, |
| const void *data) |
| { |
| const struct nfsd4_callback *cb = data; |
| const struct nfs4_layout_stateid *ls = |
| container_of(cb, struct nfs4_layout_stateid, ls_recall); |
| struct nfs4_cb_compound_hdr hdr = { |
| .ident = 0, |
| .minorversion = cb->cb_clp->cl_minorversion, |
| }; |
| |
| encode_cb_compound4args(xdr, &hdr); |
| encode_cb_sequence4args(xdr, cb, &hdr); |
| encode_cb_layout4args(xdr, ls, &hdr); |
| encode_cb_nops(&hdr); |
| } |
| |
| static int nfs4_xdr_dec_cb_layout(struct rpc_rqst *rqstp, |
| struct xdr_stream *xdr, |
| void *data) |
| { |
| struct nfsd4_callback *cb = data; |
| struct nfs4_cb_compound_hdr hdr; |
| int status; |
| |
| status = decode_cb_compound4res(xdr, &hdr); |
| if (unlikely(status)) |
| return status; |
| |
| status = decode_cb_sequence4res(xdr, cb); |
| if (unlikely(status || cb->cb_seq_status)) |
| return status; |
| |
| return decode_cb_op_status(xdr, OP_CB_LAYOUTRECALL, &cb->cb_status); |
| } |
| #endif /* CONFIG_NFSD_PNFS */ |
| |
| static void encode_stateowner(struct xdr_stream *xdr, struct nfs4_stateowner *so) |
| { |
| __be32 *p; |
| |
| p = xdr_reserve_space(xdr, 8 + 4 + so->so_owner.len); |
| p = xdr_encode_opaque_fixed(p, &so->so_client->cl_clientid, 8); |
| xdr_encode_opaque(p, so->so_owner.data, so->so_owner.len); |
| } |
| |
| static void nfs4_xdr_enc_cb_notify_lock(struct rpc_rqst *req, |
| struct xdr_stream *xdr, |
| const void *data) |
| { |
| const struct nfsd4_callback *cb = data; |
| const struct nfsd4_blocked_lock *nbl = |
| container_of(cb, struct nfsd4_blocked_lock, nbl_cb); |
| struct nfs4_lockowner *lo = (struct nfs4_lockowner *)nbl->nbl_lock.c.flc_owner; |
| struct nfs4_cb_compound_hdr hdr = { |
| .ident = 0, |
| .minorversion = cb->cb_clp->cl_minorversion, |
| }; |
| |
| __be32 *p; |
| |
| BUG_ON(hdr.minorversion == 0); |
| |
| encode_cb_compound4args(xdr, &hdr); |
| encode_cb_sequence4args(xdr, cb, &hdr); |
| |
| p = xdr_reserve_space(xdr, 4); |
| *p = cpu_to_be32(OP_CB_NOTIFY_LOCK); |
| encode_nfs_fh4(xdr, &nbl->nbl_fh); |
| encode_stateowner(xdr, &lo->lo_owner); |
| hdr.nops++; |
| |
| encode_cb_nops(&hdr); |
| } |
| |
| static int nfs4_xdr_dec_cb_notify_lock(struct rpc_rqst *rqstp, |
| struct xdr_stream *xdr, |
| void *data) |
| { |
| struct nfsd4_callback *cb = data; |
| struct nfs4_cb_compound_hdr hdr; |
| int status; |
| |
| status = decode_cb_compound4res(xdr, &hdr); |
| if (unlikely(status)) |
| return status; |
| |
| status = decode_cb_sequence4res(xdr, cb); |
| if (unlikely(status || cb->cb_seq_status)) |
| return status; |
| |
| return decode_cb_op_status(xdr, OP_CB_NOTIFY_LOCK, &cb->cb_status); |
| } |
| |
| /* |
| * struct write_response4 { |
| * stateid4 wr_callback_id<1>; |
| * length4 wr_count; |
| * stable_how4 wr_committed; |
| * verifier4 wr_writeverf; |
| * }; |
| * union offload_info4 switch (nfsstat4 coa_status) { |
| * case NFS4_OK: |
| * write_response4 coa_resok4; |
| * default: |
| * length4 coa_bytes_copied; |
| * }; |
| * struct CB_OFFLOAD4args { |
| * nfs_fh4 coa_fh; |
| * stateid4 coa_stateid; |
| * offload_info4 coa_offload_info; |
| * }; |
| */ |
| static void encode_offload_info4(struct xdr_stream *xdr, |
| const struct nfsd4_cb_offload *cbo) |
| { |
| __be32 *p; |
| |
| p = xdr_reserve_space(xdr, 4); |
| *p = cbo->co_nfserr; |
| switch (cbo->co_nfserr) { |
| case nfs_ok: |
| p = xdr_reserve_space(xdr, 4 + 8 + 4 + NFS4_VERIFIER_SIZE); |
| p = xdr_encode_empty_array(p); |
| p = xdr_encode_hyper(p, cbo->co_res.wr_bytes_written); |
| *p++ = cpu_to_be32(cbo->co_res.wr_stable_how); |
| p = xdr_encode_opaque_fixed(p, cbo->co_res.wr_verifier.data, |
| NFS4_VERIFIER_SIZE); |
| break; |
| default: |
| p = xdr_reserve_space(xdr, 8); |
| /* We always return success if bytes were written */ |
| p = xdr_encode_hyper(p, 0); |
| } |
| } |
| |
| static void encode_cb_offload4args(struct xdr_stream *xdr, |
| const struct nfsd4_cb_offload *cbo, |
| struct nfs4_cb_compound_hdr *hdr) |
| { |
| __be32 *p; |
| |
| p = xdr_reserve_space(xdr, 4); |
| *p = cpu_to_be32(OP_CB_OFFLOAD); |
| encode_nfs_fh4(xdr, &cbo->co_fh); |
| encode_stateid4(xdr, &cbo->co_res.cb_stateid); |
| encode_offload_info4(xdr, cbo); |
| |
| hdr->nops++; |
| } |
| |
| static void nfs4_xdr_enc_cb_offload(struct rpc_rqst *req, |
| struct xdr_stream *xdr, |
| const void *data) |
| { |
| const struct nfsd4_callback *cb = data; |
| const struct nfsd4_cb_offload *cbo = |
| container_of(cb, struct nfsd4_cb_offload, co_cb); |
| struct nfs4_cb_compound_hdr hdr = { |
| .ident = 0, |
| .minorversion = cb->cb_clp->cl_minorversion, |
| }; |
| |
| encode_cb_compound4args(xdr, &hdr); |
| encode_cb_sequence4args(xdr, cb, &hdr); |
| encode_cb_offload4args(xdr, cbo, &hdr); |
| encode_cb_nops(&hdr); |
| } |
| |
| static int nfs4_xdr_dec_cb_offload(struct rpc_rqst *rqstp, |
| struct xdr_stream *xdr, |
| void *data) |
| { |
| struct nfsd4_callback *cb = data; |
| struct nfs4_cb_compound_hdr hdr; |
| int status; |
| |
| status = decode_cb_compound4res(xdr, &hdr); |
| if (unlikely(status)) |
| return status; |
| |
| status = decode_cb_sequence4res(xdr, cb); |
| if (unlikely(status || cb->cb_seq_status)) |
| return status; |
| |
| return decode_cb_op_status(xdr, OP_CB_OFFLOAD, &cb->cb_status); |
| } |
| /* |
| * RPC procedure tables |
| */ |
| #define PROC(proc, call, argtype, restype) \ |
| [NFSPROC4_CLNT_##proc] = { \ |
| .p_proc = NFSPROC4_CB_##call, \ |
| .p_encode = nfs4_xdr_enc_##argtype, \ |
| .p_decode = 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 const struct rpc_procinfo nfs4_cb_procedures[] = { |
| PROC(CB_NULL, NULL, cb_null, cb_null), |
| PROC(CB_RECALL, COMPOUND, cb_recall, cb_recall), |
| #ifdef CONFIG_NFSD_PNFS |
| PROC(CB_LAYOUT, COMPOUND, cb_layout, cb_layout), |
| #endif |
| PROC(CB_NOTIFY_LOCK, COMPOUND, cb_notify_lock, cb_notify_lock), |
| PROC(CB_OFFLOAD, COMPOUND, cb_offload, cb_offload), |
| PROC(CB_RECALL_ANY, COMPOUND, cb_recall_any, cb_recall_any), |
| PROC(CB_GETATTR, COMPOUND, cb_getattr, cb_getattr), |
| }; |
| |
| static unsigned int nfs4_cb_counts[ARRAY_SIZE(nfs4_cb_procedures)]; |
| static const 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, |
| .counts = nfs4_cb_counts, |
| }; |
| |
| static const struct rpc_version *nfs_cb_version[2] = { |
| [1] = &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(struct net *net) |
| { |
| struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
| |
| /* |
| * nfsd4_lease is set to at most one hour in __nfsd4_write_time, |
| * so we can use 32-bit math on it. Warn if that assumption |
| * ever stops being true. |
| */ |
| if (WARN_ON_ONCE(nn->nfsd4_lease > 3600)) |
| return 360 * HZ; |
| |
| return max(((u32)nn->nfsd4_lease)/10, 1u) * HZ; |
| } |
| |
| static bool nfsd4_queue_cb(struct nfsd4_callback *cb) |
| { |
| struct nfs4_client *clp = cb->cb_clp; |
| |
| trace_nfsd_cb_queue(clp, cb); |
| return queue_work(clp->cl_callback_wq, &cb->cb_work); |
| } |
| |
| static void nfsd41_cb_inflight_begin(struct nfs4_client *clp) |
| { |
| atomic_inc(&clp->cl_cb_inflight); |
| } |
| |
| static void nfsd41_cb_inflight_end(struct nfs4_client *clp) |
| { |
| |
| if (atomic_dec_and_test(&clp->cl_cb_inflight)) |
| wake_up_var(&clp->cl_cb_inflight); |
| } |
| |
| static void nfsd41_cb_inflight_wait_complete(struct nfs4_client *clp) |
| { |
| wait_var_event(&clp->cl_cb_inflight, |
| !atomic_read(&clp->cl_cb_inflight)); |
| } |
| |
| static const struct cred *get_backchannel_cred(struct nfs4_client *clp, struct rpc_clnt *client, struct nfsd4_session *ses) |
| { |
| if (clp->cl_minorversion == 0) { |
| client->cl_principal = clp->cl_cred.cr_targ_princ ? |
| clp->cl_cred.cr_targ_princ : "nfs"; |
| |
| return get_cred(rpc_machine_cred()); |
| } else { |
| struct cred *kcred; |
| |
| kcred = prepare_kernel_cred(&init_task); |
| if (!kcred) |
| return NULL; |
| |
| kcred->fsuid = ses->se_cb_sec.uid; |
| kcred->fsgid = ses->se_cb_sec.gid; |
| return kcred; |
| } |
| } |
| |
| static int setup_callback_client(struct nfs4_client *clp, struct nfs4_cb_conn *conn, struct nfsd4_session *ses) |
| { |
| int maxtime = max_cb_time(clp->net); |
| struct rpc_timeout timeparms = { |
| .to_initval = maxtime, |
| .to_retries = 0, |
| .to_maxval = maxtime, |
| }; |
| struct rpc_create_args args = { |
| .net = clp->net, |
| .address = (struct sockaddr *) &conn->cb_addr, |
| .addrsize = conn->cb_addrlen, |
| .saddress = (struct sockaddr *) &conn->cb_saddr, |
| .timeout = &timeparms, |
| .program = &cb_program, |
| .version = 1, |
| .flags = (RPC_CLNT_CREATE_NOPING | RPC_CLNT_CREATE_QUIET), |
| .cred = current_cred(), |
| }; |
| struct rpc_clnt *client; |
| const struct cred *cred; |
| |
| if (clp->cl_minorversion == 0) { |
| if (!clp->cl_cred.cr_principal && |
| (clp->cl_cred.cr_flavor >= RPC_AUTH_GSS_KRB5)) { |
| trace_nfsd_cb_setup_err(clp, -EINVAL); |
| return -EINVAL; |
| } |
| args.client_name = clp->cl_cred.cr_principal; |
| args.prognumber = conn->cb_prog; |
| args.protocol = XPRT_TRANSPORT_TCP; |
| args.authflavor = clp->cl_cred.cr_flavor; |
| clp->cl_cb_ident = conn->cb_ident; |
| } else { |
| if (!conn->cb_xprt) |
| return -EINVAL; |
| clp->cl_cb_session = ses; |
| args.bc_xprt = conn->cb_xprt; |
| args.prognumber = clp->cl_cb_session->se_cb_prog; |
| args.protocol = conn->cb_xprt->xpt_class->xcl_ident | |
| XPRT_TRANSPORT_BC; |
| args.authflavor = ses->se_cb_sec.flavor; |
| } |
| /* Create RPC client */ |
| client = rpc_create(&args); |
| if (IS_ERR(client)) { |
| trace_nfsd_cb_setup_err(clp, PTR_ERR(client)); |
| return PTR_ERR(client); |
| } |
| cred = get_backchannel_cred(clp, client, ses); |
| if (!cred) { |
| trace_nfsd_cb_setup_err(clp, -ENOMEM); |
| rpc_shutdown_client(client); |
| return -ENOMEM; |
| } |
| |
| if (clp->cl_minorversion != 0) |
| clp->cl_cb_conn.cb_xprt = conn->cb_xprt; |
| clp->cl_cb_client = client; |
| clp->cl_cb_cred = cred; |
| rcu_read_lock(); |
| trace_nfsd_cb_setup(clp, rpc_peeraddr2str(client, RPC_DISPLAY_NETID), |
| args.authflavor); |
| rcu_read_unlock(); |
| return 0; |
| } |
| |
| static void nfsd4_mark_cb_state(struct nfs4_client *clp, int newstate) |
| { |
| if (clp->cl_cb_state != newstate) { |
| clp->cl_cb_state = newstate; |
| trace_nfsd_cb_new_state(clp); |
| } |
| } |
| |
| static void nfsd4_mark_cb_down(struct nfs4_client *clp) |
| { |
| if (test_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags)) |
| return; |
| nfsd4_mark_cb_state(clp, NFSD4_CB_DOWN); |
| } |
| |
| static void nfsd4_mark_cb_fault(struct nfs4_client *clp) |
| { |
| if (test_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags)) |
| return; |
| nfsd4_mark_cb_state(clp, NFSD4_CB_FAULT); |
| } |
| |
| 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); |
| else |
| nfsd4_mark_cb_state(clp, NFSD4_CB_UP); |
| } |
| |
| static void nfsd4_cb_probe_release(void *calldata) |
| { |
| struct nfs4_client *clp = container_of(calldata, struct nfs4_client, cl_cb_null); |
| |
| nfsd41_cb_inflight_end(clp); |
| |
| } |
| |
| 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, |
| .rpc_release = nfsd4_cb_probe_release, |
| }; |
| |
| /* |
| * 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) |
| { |
| trace_nfsd_cb_probe(clp); |
| nfsd4_mark_cb_state(clp, NFSD4_CB_UNKNOWN); |
| set_bit(NFSD4_CLIENT_CB_UPDATE, &clp->cl_flags); |
| nfsd4_run_cb(&clp->cl_cb_null); |
| } |
| |
| void nfsd4_probe_callback_sync(struct nfs4_client *clp) |
| { |
| nfsd4_probe_callback(clp); |
| flush_workqueue(clp->cl_callback_wq); |
| } |
| |
| void nfsd4_change_callback(struct nfs4_client *clp, struct nfs4_cb_conn *conn) |
| { |
| nfsd4_mark_cb_state(clp, NFSD4_CB_UNKNOWN); |
| spin_lock(&clp->cl_lock); |
| memcpy(&clp->cl_cb_conn, conn, sizeof(struct nfs4_cb_conn)); |
| spin_unlock(&clp->cl_lock); |
| } |
| |
| static int grab_slot(struct nfsd4_session *ses) |
| { |
| int idx; |
| |
| spin_lock(&ses->se_lock); |
| idx = ffs(ses->se_cb_slot_avail) - 1; |
| if (idx < 0 || idx > ses->se_cb_highest_slot) { |
| spin_unlock(&ses->se_lock); |
| return -1; |
| } |
| /* clear the bit for the slot */ |
| ses->se_cb_slot_avail &= ~BIT(idx); |
| spin_unlock(&ses->se_lock); |
| return idx; |
| } |
| |
| /* |
| * 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 nfsd4_callback *cb, struct rpc_task *task) |
| { |
| struct nfs4_client *clp = cb->cb_clp; |
| struct nfsd4_session *ses = clp->cl_cb_session; |
| |
| if (cb->cb_held_slot >= 0) |
| return true; |
| cb->cb_held_slot = grab_slot(ses); |
| if (cb->cb_held_slot < 0) { |
| rpc_sleep_on(&clp->cl_cb_waitq, task, NULL); |
| /* Race breaker */ |
| cb->cb_held_slot = grab_slot(ses); |
| if (cb->cb_held_slot < 0) |
| return false; |
| rpc_wake_up_queued_task(&clp->cl_cb_waitq, task); |
| } |
| return true; |
| } |
| |
| static void nfsd41_cb_release_slot(struct nfsd4_callback *cb) |
| { |
| struct nfs4_client *clp = cb->cb_clp; |
| struct nfsd4_session *ses = clp->cl_cb_session; |
| |
| if (cb->cb_held_slot >= 0) { |
| spin_lock(&ses->se_lock); |
| ses->se_cb_slot_avail |= BIT(cb->cb_held_slot); |
| spin_unlock(&ses->se_lock); |
| cb->cb_held_slot = -1; |
| rpc_wake_up_next(&clp->cl_cb_waitq); |
| } |
| } |
| |
| static void nfsd41_destroy_cb(struct nfsd4_callback *cb) |
| { |
| struct nfs4_client *clp = cb->cb_clp; |
| |
| trace_nfsd_cb_destroy(clp, cb); |
| nfsd41_cb_release_slot(cb); |
| if (cb->cb_ops && cb->cb_ops->release) |
| cb->cb_ops->release(cb); |
| nfsd41_cb_inflight_end(clp); |
| } |
| |
| /* |
| * TODO: cb_sequence should support referring call lists, cachethis, |
| * 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_client *clp = cb->cb_clp; |
| u32 minorversion = clp->cl_minorversion; |
| |
| /* |
| * cb_seq_status is only set in decode_cb_sequence4res, |
| * and so will remain 1 if an rpc level failure occurs. |
| */ |
| trace_nfsd_cb_rpc_prepare(clp); |
| cb->cb_seq_status = 1; |
| cb->cb_status = 0; |
| if (minorversion && !nfsd41_cb_get_slot(cb, task)) |
| return; |
| rpc_call_start(task); |
| } |
| |
| static bool nfsd4_cb_sequence_done(struct rpc_task *task, struct nfsd4_callback *cb) |
| { |
| struct nfs4_client *clp = cb->cb_clp; |
| struct nfsd4_session *session = clp->cl_cb_session; |
| bool ret = true; |
| |
| if (!clp->cl_minorversion) { |
| /* |
| * If the backchannel connection was shut down while this |
| * task was queued, we need to resubmit it after setting up |
| * a new backchannel connection. |
| * |
| * Note that if we lost our callback connection permanently |
| * the submission code will error out, so we don't need to |
| * handle that case here. |
| */ |
| if (RPC_SIGNALLED(task)) |
| goto need_restart; |
| |
| return true; |
| } |
| |
| if (cb->cb_held_slot < 0) |
| goto need_restart; |
| |
| /* This is the operation status code for CB_SEQUENCE */ |
| trace_nfsd_cb_seq_status(task, cb); |
| switch (cb->cb_seq_status) { |
| case 0: |
| /* |
| * No need for lock, access serialized in nfsd4_cb_prepare |
| * |
| * RFC5661 20.9.3 |
| * If CB_SEQUENCE returns an error, then the state of the slot |
| * (sequence ID, cached reply) MUST NOT change. |
| */ |
| ++session->se_cb_seq_nr[cb->cb_held_slot]; |
| break; |
| case -ESERVERFAULT: |
| ++session->se_cb_seq_nr[cb->cb_held_slot]; |
| nfsd4_mark_cb_fault(cb->cb_clp); |
| ret = false; |
| break; |
| case 1: |
| /* |
| * cb_seq_status remains 1 if an RPC Reply was never |
| * received. NFSD can't know if the client processed |
| * the CB_SEQUENCE operation. Ask the client to send a |
| * DESTROY_SESSION to recover. |
| */ |
| fallthrough; |
| case -NFS4ERR_BADSESSION: |
| nfsd4_mark_cb_fault(cb->cb_clp); |
| ret = false; |
| goto need_restart; |
| case -NFS4ERR_DELAY: |
| cb->cb_seq_status = 1; |
| if (!rpc_restart_call(task)) |
| goto out; |
| |
| rpc_delay(task, 2 * HZ); |
| return false; |
| case -NFS4ERR_BADSLOT: |
| goto retry_nowait; |
| case -NFS4ERR_SEQ_MISORDERED: |
| if (session->se_cb_seq_nr[cb->cb_held_slot] != 1) { |
| session->se_cb_seq_nr[cb->cb_held_slot] = 1; |
| goto retry_nowait; |
| } |
| break; |
| default: |
| nfsd4_mark_cb_fault(cb->cb_clp); |
| } |
| trace_nfsd_cb_free_slot(task, cb); |
| nfsd41_cb_release_slot(cb); |
| |
| if (RPC_SIGNALLED(task)) |
| goto need_restart; |
| out: |
| return ret; |
| retry_nowait: |
| if (rpc_restart_call_prepare(task)) |
| ret = false; |
| goto out; |
| need_restart: |
| if (!test_bit(NFSD4_CLIENT_CB_KILL, &clp->cl_flags)) { |
| trace_nfsd_cb_restart(clp, cb); |
| task->tk_status = 0; |
| cb->cb_need_restart = true; |
| } |
| return false; |
| } |
| |
| static void nfsd4_cb_done(struct rpc_task *task, void *calldata) |
| { |
| struct nfsd4_callback *cb = calldata; |
| struct nfs4_client *clp = cb->cb_clp; |
| |
| trace_nfsd_cb_rpc_done(clp); |
| |
| if (!nfsd4_cb_sequence_done(task, cb)) |
| return; |
| |
| if (cb->cb_status) { |
| WARN_ONCE(task->tk_status, "cb_status=%d tk_status=%d", |
| cb->cb_status, task->tk_status); |
| task->tk_status = cb->cb_status; |
| } |
| |
| switch (cb->cb_ops->done(cb, task)) { |
| case 0: |
| task->tk_status = 0; |
| rpc_restart_call_prepare(task); |
| return; |
| case 1: |
| switch (task->tk_status) { |
| case -EIO: |
| case -ETIMEDOUT: |
| case -EACCES: |
| nfsd4_mark_cb_down(clp); |
| } |
| break; |
| default: |
| BUG(); |
| } |
| } |
| |
| static void nfsd4_cb_release(void *calldata) |
| { |
| struct nfsd4_callback *cb = calldata; |
| |
| trace_nfsd_cb_rpc_release(cb->cb_clp); |
| |
| if (cb->cb_need_restart) |
| nfsd4_queue_cb(cb); |
| else |
| nfsd41_destroy_cb(cb); |
| |
| } |
| |
| static const struct rpc_call_ops nfsd4_cb_ops = { |
| .rpc_call_prepare = nfsd4_cb_prepare, |
| .rpc_call_done = nfsd4_cb_done, |
| .rpc_release = nfsd4_cb_release, |
| }; |
| |
| /* must be called under the state lock */ |
| void nfsd4_shutdown_callback(struct nfs4_client *clp) |
| { |
| if (clp->cl_cb_state != NFSD4_CB_UNKNOWN) |
| trace_nfsd_cb_shutdown(clp); |
| |
| set_bit(NFSD4_CLIENT_CB_KILL, &clp->cl_flags); |
| /* |
| * Note this won't actually result in a null callback; |
| * instead, nfsd4_run_cb_null() will detect the killed |
| * client, destroy the rpc client, and stop: |
| */ |
| nfsd4_run_cb(&clp->cl_cb_null); |
| flush_workqueue(clp->cl_callback_wq); |
| nfsd41_cb_inflight_wait_complete(clp); |
| } |
| |
| static struct nfsd4_conn * __nfsd4_find_backchannel(struct nfs4_client *clp) |
| { |
| struct nfsd4_session *s; |
| struct nfsd4_conn *c; |
| |
| lockdep_assert_held(&clp->cl_lock); |
| |
| 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; |
| } |
| |
| /* |
| * Note there isn't a lot of locking in this code; instead we depend on |
| * the fact that it is run from clp->cl_callback_wq, which won't run two |
| * work items at once. So, for example, clp->cl_callback_wq handles all |
| * access of cl_cb_client and all calls to rpc_create or rpc_shutdown_client. |
| */ |
| 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; |
| |
| trace_nfsd_cb_bc_update(clp, cb); |
| |
| /* |
| * This is either an update, or the client dying; in either case, |
| * kill the old client: |
| */ |
| if (clp->cl_cb_client) { |
| trace_nfsd_cb_bc_shutdown(clp, cb); |
| rpc_shutdown_client(clp->cl_cb_client); |
| clp->cl_cb_client = NULL; |
| put_cred(clp->cl_cb_cred); |
| clp->cl_cb_cred = 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: |
| */ |
| WARN_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); |
| if (!c) |
| return; |
| |
| err = setup_callback_client(clp, &conn, ses); |
| if (err) { |
| nfsd4_mark_cb_down(clp); |
| if (c) |
| svc_xprt_put(c->cn_xprt); |
| return; |
| } |
| } |
| |
| static void |
| nfsd4_run_cb_work(struct work_struct *work) |
| { |
| struct nfsd4_callback *cb = |
| container_of(work, struct nfsd4_callback, cb_work); |
| struct nfs4_client *clp = cb->cb_clp; |
| struct rpc_clnt *clnt; |
| int flags; |
| |
| trace_nfsd_cb_start(clp); |
| |
| 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: */ |
| nfsd41_destroy_cb(cb); |
| return; |
| } |
| |
| /* |
| * Don't send probe messages for 4.1 or later. |
| */ |
| if (!cb->cb_ops && clp->cl_minorversion) { |
| nfsd4_mark_cb_state(clp, NFSD4_CB_UP); |
| nfsd41_destroy_cb(cb); |
| return; |
| } |
| |
| if (cb->cb_need_restart) { |
| cb->cb_need_restart = false; |
| } else { |
| if (cb->cb_ops && cb->cb_ops->prepare) |
| cb->cb_ops->prepare(cb); |
| } |
| cb->cb_msg.rpc_cred = clp->cl_cb_cred; |
| flags = clp->cl_minorversion ? RPC_TASK_NOCONNECT : RPC_TASK_SOFTCONN; |
| rpc_call_async(clnt, &cb->cb_msg, RPC_TASK_SOFT | flags, |
| cb->cb_ops ? &nfsd4_cb_ops : &nfsd4_cb_probe_ops, cb); |
| } |
| |
| void nfsd4_init_cb(struct nfsd4_callback *cb, struct nfs4_client *clp, |
| const struct nfsd4_callback_ops *ops, enum nfsd4_cb_op op) |
| { |
| cb->cb_clp = clp; |
| cb->cb_msg.rpc_proc = &nfs4_cb_procedures[op]; |
| cb->cb_msg.rpc_argp = cb; |
| cb->cb_msg.rpc_resp = cb; |
| cb->cb_ops = ops; |
| INIT_WORK(&cb->cb_work, nfsd4_run_cb_work); |
| cb->cb_status = 0; |
| cb->cb_need_restart = false; |
| cb->cb_held_slot = -1; |
| } |
| |
| /** |
| * nfsd4_run_cb - queue up a callback job to run |
| * @cb: callback to queue |
| * |
| * Kick off a callback to do its thing. Returns false if it was already |
| * on a queue, true otherwise. |
| */ |
| bool nfsd4_run_cb(struct nfsd4_callback *cb) |
| { |
| struct nfs4_client *clp = cb->cb_clp; |
| bool queued; |
| |
| nfsd41_cb_inflight_begin(clp); |
| queued = nfsd4_queue_cb(cb); |
| if (!queued) |
| nfsd41_cb_inflight_end(clp); |
| return queued; |
| } |