/* * Device operations for the pnfs nfs4 file layout driver. * * Copyright (c) 2014, Primary Data, Inc. All rights reserved. * * Tao Peng */ #include #include #include #include #include "../internal.h" #include "../nfs4session.h" #include "flexfilelayout.h" #define NFSDBG_FACILITY NFSDBG_PNFS_LD static unsigned int dataserver_timeo = NFS4_DEF_DS_TIMEO; static unsigned int dataserver_retrans = NFS4_DEF_DS_RETRANS; void nfs4_ff_layout_put_deviceid(struct nfs4_ff_layout_ds *mirror_ds) { if (mirror_ds) nfs4_put_deviceid_node(&mirror_ds->id_node); } void nfs4_ff_layout_free_deviceid(struct nfs4_ff_layout_ds *mirror_ds) { nfs4_print_deviceid(&mirror_ds->id_node.deviceid); nfs4_pnfs_ds_put(mirror_ds->ds); kfree_rcu(mirror_ds, id_node.rcu); } /* Decode opaque device data and construct new_ds using it */ struct nfs4_ff_layout_ds * nfs4_ff_alloc_deviceid_node(struct nfs_server *server, struct pnfs_device *pdev, gfp_t gfp_flags) { struct xdr_stream stream; struct xdr_buf buf; struct page *scratch; struct list_head dsaddrs; struct nfs4_pnfs_ds_addr *da; struct nfs4_ff_layout_ds *new_ds = NULL; struct nfs4_ff_ds_version *ds_versions = NULL; u32 mp_count; u32 version_count; __be32 *p; int i, ret = -ENOMEM; /* set up xdr stream */ scratch = alloc_page(gfp_flags); if (!scratch) goto out_err; new_ds = kzalloc(sizeof(struct nfs4_ff_layout_ds), gfp_flags); if (!new_ds) goto out_scratch; nfs4_init_deviceid_node(&new_ds->id_node, server, &pdev->dev_id); INIT_LIST_HEAD(&dsaddrs); xdr_init_decode_pages(&stream, &buf, pdev->pages, pdev->pglen); xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE); /* multipath count */ p = xdr_inline_decode(&stream, 4); if (unlikely(!p)) goto out_err_drain_dsaddrs; mp_count = be32_to_cpup(p); dprintk("%s: multipath ds count %d\n", __func__, mp_count); for (i = 0; i < mp_count; i++) { /* multipath ds */ da = nfs4_decode_mp_ds_addr(server->nfs_client->cl_net, &stream, gfp_flags); if (da) list_add_tail(&da->da_node, &dsaddrs); } if (list_empty(&dsaddrs)) { dprintk("%s: no suitable DS addresses found\n", __func__); ret = -ENOMEDIUM; goto out_err_drain_dsaddrs; } /* version count */ p = xdr_inline_decode(&stream, 4); if (unlikely(!p)) goto out_err_drain_dsaddrs; version_count = be32_to_cpup(p); dprintk("%s: version count %d\n", __func__, version_count); ds_versions = kzalloc(version_count * sizeof(struct nfs4_ff_ds_version), gfp_flags); if (!ds_versions) goto out_scratch; for (i = 0; i < version_count; i++) { /* 20 = version(4) + minor_version(4) + rsize(4) + wsize(4) + * tightly_coupled(4) */ p = xdr_inline_decode(&stream, 20); if (unlikely(!p)) goto out_err_drain_dsaddrs; ds_versions[i].version = be32_to_cpup(p++); ds_versions[i].minor_version = be32_to_cpup(p++); ds_versions[i].rsize = nfs_block_size(be32_to_cpup(p++), NULL); ds_versions[i].wsize = nfs_block_size(be32_to_cpup(p++), NULL); ds_versions[i].tightly_coupled = be32_to_cpup(p); if (ds_versions[i].rsize > NFS_MAX_FILE_IO_SIZE) ds_versions[i].rsize = NFS_MAX_FILE_IO_SIZE; if (ds_versions[i].wsize > NFS_MAX_FILE_IO_SIZE) ds_versions[i].wsize = NFS_MAX_FILE_IO_SIZE; if (ds_versions[i].version != 3 || ds_versions[i].minor_version != 0) { dprintk("%s: [%d] unsupported ds version %d-%d\n", __func__, i, ds_versions[i].version, ds_versions[i].minor_version); ret = -EPROTONOSUPPORT; goto out_err_drain_dsaddrs; } dprintk("%s: [%d] vers %u minor_ver %u rsize %u wsize %u coupled %d\n", __func__, i, ds_versions[i].version, ds_versions[i].minor_version, ds_versions[i].rsize, ds_versions[i].wsize, ds_versions[i].tightly_coupled); } new_ds->ds_versions = ds_versions; new_ds->ds_versions_cnt = version_count; new_ds->ds = nfs4_pnfs_ds_add(&dsaddrs, gfp_flags); if (!new_ds->ds) goto out_err_drain_dsaddrs; /* If DS was already in cache, free ds addrs */ while (!list_empty(&dsaddrs)) { da = list_first_entry(&dsaddrs, struct nfs4_pnfs_ds_addr, da_node); list_del_init(&da->da_node); kfree(da->da_remotestr); kfree(da); } __free_page(scratch); return new_ds; out_err_drain_dsaddrs: while (!list_empty(&dsaddrs)) { da = list_first_entry(&dsaddrs, struct nfs4_pnfs_ds_addr, da_node); list_del_init(&da->da_node); kfree(da->da_remotestr); kfree(da); } kfree(ds_versions); out_scratch: __free_page(scratch); out_err: kfree(new_ds); dprintk("%s ERROR: returning %d\n", __func__, ret); return NULL; } static u64 end_offset(u64 start, u64 len) { u64 end; end = start + len; return end >= start ? end : NFS4_MAX_UINT64; } static void extend_ds_error(struct nfs4_ff_layout_ds_err *err, u64 offset, u64 length) { u64 end; end = max_t(u64, end_offset(err->offset, err->length), end_offset(offset, length)); err->offset = min_t(u64, err->offset, offset); err->length = end - err->offset; } static bool ds_error_can_merge(struct nfs4_ff_layout_ds_err *err, u64 offset, u64 length, int status, enum nfs_opnum4 opnum, nfs4_stateid *stateid, struct nfs4_deviceid *deviceid) { return err->status == status && err->opnum == opnum && nfs4_stateid_match(&err->stateid, stateid) && !memcmp(&err->deviceid, deviceid, sizeof(*deviceid)) && end_offset(err->offset, err->length) >= offset && err->offset <= end_offset(offset, length); } static bool merge_ds_error(struct nfs4_ff_layout_ds_err *old, struct nfs4_ff_layout_ds_err *new) { if (!ds_error_can_merge(old, new->offset, new->length, new->status, new->opnum, &new->stateid, &new->deviceid)) return false; extend_ds_error(old, new->offset, new->length); return true; } static bool ff_layout_add_ds_error_locked(struct nfs4_flexfile_layout *flo, struct nfs4_ff_layout_ds_err *dserr) { struct nfs4_ff_layout_ds_err *err; list_for_each_entry(err, &flo->error_list, list) { if (merge_ds_error(err, dserr)) { return true; } } list_add(&dserr->list, &flo->error_list); return false; } static bool ff_layout_update_ds_error(struct nfs4_flexfile_layout *flo, u64 offset, u64 length, int status, enum nfs_opnum4 opnum, nfs4_stateid *stateid, struct nfs4_deviceid *deviceid) { bool found = false; struct nfs4_ff_layout_ds_err *err; list_for_each_entry(err, &flo->error_list, list) { if (ds_error_can_merge(err, offset, length, status, opnum, stateid, deviceid)) { found = true; extend_ds_error(err, offset, length); break; } } return found; } int ff_layout_track_ds_error(struct nfs4_flexfile_layout *flo, struct nfs4_ff_layout_mirror *mirror, u64 offset, u64 length, int status, enum nfs_opnum4 opnum, gfp_t gfp_flags) { struct nfs4_ff_layout_ds_err *dserr; bool needfree; if (status == 0) return 0; if (mirror->mirror_ds == NULL) return -EINVAL; spin_lock(&flo->generic_hdr.plh_inode->i_lock); if (ff_layout_update_ds_error(flo, offset, length, status, opnum, &mirror->stateid, &mirror->mirror_ds->id_node.deviceid)) { spin_unlock(&flo->generic_hdr.plh_inode->i_lock); return 0; } spin_unlock(&flo->generic_hdr.plh_inode->i_lock); dserr = kmalloc(sizeof(*dserr), gfp_flags); if (!dserr) return -ENOMEM; INIT_LIST_HEAD(&dserr->list); dserr->offset = offset; dserr->length = length; dserr->status = status; dserr->opnum = opnum; nfs4_stateid_copy(&dserr->stateid, &mirror->stateid); memcpy(&dserr->deviceid, &mirror->mirror_ds->id_node.deviceid, NFS4_DEVICEID4_SIZE); spin_lock(&flo->generic_hdr.plh_inode->i_lock); needfree = ff_layout_add_ds_error_locked(flo, dserr); spin_unlock(&flo->generic_hdr.plh_inode->i_lock); if (needfree) kfree(dserr); return 0; } /* currently we only support AUTH_NONE and AUTH_SYS */ static rpc_authflavor_t nfs4_ff_layout_choose_authflavor(struct nfs4_ff_layout_mirror *mirror) { if (mirror->uid == (u32)-1) return RPC_AUTH_NULL; return RPC_AUTH_UNIX; } /* fetch cred for NFSv3 DS */ static int ff_layout_update_mirror_cred(struct nfs4_ff_layout_mirror *mirror, struct nfs4_pnfs_ds *ds) { if (ds->ds_clp && !mirror->cred && mirror->mirror_ds->ds_versions[0].version == 3) { struct rpc_auth *auth = ds->ds_clp->cl_rpcclient->cl_auth; struct rpc_cred *cred; struct auth_cred acred = { .uid = make_kuid(&init_user_ns, mirror->uid), .gid = make_kgid(&init_user_ns, mirror->gid), }; /* AUTH_NULL ignores acred */ cred = auth->au_ops->lookup_cred(auth, &acred, 0); if (IS_ERR(cred)) { dprintk("%s: lookup_cred failed with %ld\n", __func__, PTR_ERR(cred)); return PTR_ERR(cred); } else { if (cmpxchg(&mirror->cred, NULL, cred)) put_rpccred(cred); } } return 0; } struct nfs_fh * nfs4_ff_layout_select_ds_fh(struct pnfs_layout_segment *lseg, u32 mirror_idx) { struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, mirror_idx); struct nfs_fh *fh = NULL; struct nfs4_deviceid_node *devid; if (mirror == NULL || mirror->mirror_ds == NULL || mirror->mirror_ds->ds == NULL) { printk(KERN_ERR "NFS: %s: No data server for mirror offset index %d\n", __func__, mirror_idx); if (mirror && mirror->mirror_ds) { devid = &mirror->mirror_ds->id_node; pnfs_generic_mark_devid_invalid(devid); } goto out; } /* FIXME: For now assume there is only 1 version available for the DS */ fh = &mirror->fh_versions[0]; out: return fh; } /* Upon return, either ds is connected, or ds is NULL */ struct nfs4_pnfs_ds * nfs4_ff_layout_prepare_ds(struct pnfs_layout_segment *lseg, u32 ds_idx, bool fail_return) { struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, ds_idx); struct nfs4_pnfs_ds *ds = NULL; struct nfs4_deviceid_node *devid; struct inode *ino = lseg->pls_layout->plh_inode; struct nfs_server *s = NFS_SERVER(ino); unsigned int max_payload; rpc_authflavor_t flavor; if (mirror == NULL || mirror->mirror_ds == NULL || mirror->mirror_ds->ds == NULL) { printk(KERN_ERR "NFS: %s: No data server for offset index %d\n", __func__, ds_idx); if (mirror && mirror->mirror_ds) { devid = &mirror->mirror_ds->id_node; pnfs_generic_mark_devid_invalid(devid); } goto out; } devid = &mirror->mirror_ds->id_node; if (ff_layout_test_devid_unavailable(devid)) goto out; ds = mirror->mirror_ds->ds; /* matching smp_wmb() in _nfs4_pnfs_v3/4_ds_connect */ smp_rmb(); if (ds->ds_clp) goto out; flavor = nfs4_ff_layout_choose_authflavor(mirror); /* FIXME: For now we assume the server sent only one version of NFS * to use for the DS. */ nfs4_pnfs_ds_connect(s, ds, devid, dataserver_timeo, dataserver_retrans, mirror->mirror_ds->ds_versions[0].version, mirror->mirror_ds->ds_versions[0].minor_version, flavor); /* connect success, check rsize/wsize limit */ if (ds->ds_clp) { max_payload = nfs_block_size(rpc_max_payload(ds->ds_clp->cl_rpcclient), NULL); if (mirror->mirror_ds->ds_versions[0].rsize > max_payload) mirror->mirror_ds->ds_versions[0].rsize = max_payload; if (mirror->mirror_ds->ds_versions[0].wsize > max_payload) mirror->mirror_ds->ds_versions[0].wsize = max_payload; } else { ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout), mirror, lseg->pls_range.offset, lseg->pls_range.length, NFS4ERR_NXIO, OP_ILLEGAL, GFP_NOIO); if (fail_return) { pnfs_error_mark_layout_for_return(ino, lseg); if (ff_layout_has_available_ds(lseg)) pnfs_set_retry_layoutget(lseg->pls_layout); else pnfs_clear_retry_layoutget(lseg->pls_layout); } else { if (ff_layout_has_available_ds(lseg)) set_bit(NFS_LAYOUT_RETURN_BEFORE_CLOSE, &lseg->pls_layout->plh_flags); else { pnfs_error_mark_layout_for_return(ino, lseg); pnfs_clear_retry_layoutget(lseg->pls_layout); } } } if (ff_layout_update_mirror_cred(mirror, ds)) ds = NULL; out: return ds; } struct rpc_cred * ff_layout_get_ds_cred(struct pnfs_layout_segment *lseg, u32 ds_idx, struct rpc_cred *mdscred) { struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, ds_idx); struct rpc_cred *cred = ERR_PTR(-EINVAL); if (!nfs4_ff_layout_prepare_ds(lseg, ds_idx, true)) goto out; if (mirror && mirror->cred) cred = mirror->cred; else cred = mdscred; out: return cred; } /** * Find or create a DS rpc client with th MDS server rpc client auth flavor * in the nfs_client cl_ds_clients list. */ struct rpc_clnt * nfs4_ff_find_or_create_ds_client(struct pnfs_layout_segment *lseg, u32 ds_idx, struct nfs_client *ds_clp, struct inode *inode) { struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, ds_idx); switch (mirror->mirror_ds->ds_versions[0].version) { case 3: /* For NFSv3 DS, flavor is set when creating DS connections */ return ds_clp->cl_rpcclient; case 4: return nfs4_find_or_create_ds_client(ds_clp, inode); default: BUG(); } } static bool is_range_intersecting(u64 offset1, u64 length1, u64 offset2, u64 length2) { u64 end1 = end_offset(offset1, length1); u64 end2 = end_offset(offset2, length2); return (end1 == NFS4_MAX_UINT64 || end1 > offset2) && (end2 == NFS4_MAX_UINT64 || end2 > offset1); } /* called with inode i_lock held */ int ff_layout_encode_ds_ioerr(struct nfs4_flexfile_layout *flo, struct xdr_stream *xdr, int *count, const struct pnfs_layout_range *range) { struct nfs4_ff_layout_ds_err *err, *n; __be32 *p; list_for_each_entry_safe(err, n, &flo->error_list, list) { if (!is_range_intersecting(err->offset, err->length, range->offset, range->length)) continue; /* offset(8) + length(8) + stateid(NFS4_STATEID_SIZE) * + deviceid(NFS4_DEVICEID4_SIZE) + status(4) + opnum(4) */ p = xdr_reserve_space(xdr, 24 + NFS4_STATEID_SIZE + NFS4_DEVICEID4_SIZE); if (unlikely(!p)) return -ENOBUFS; p = xdr_encode_hyper(p, err->offset); p = xdr_encode_hyper(p, err->length); p = xdr_encode_opaque_fixed(p, &err->stateid, NFS4_STATEID_SIZE); p = xdr_encode_opaque_fixed(p, &err->deviceid, NFS4_DEVICEID4_SIZE); *p++ = cpu_to_be32(err->status); *p++ = cpu_to_be32(err->opnum); *count += 1; list_del(&err->list); dprintk("%s: offset %llu length %llu status %d op %d count %d\n", __func__, err->offset, err->length, err->status, err->opnum, *count); kfree(err); } return 0; } bool ff_layout_has_available_ds(struct pnfs_layout_segment *lseg) { struct nfs4_ff_layout_mirror *mirror; struct nfs4_deviceid_node *devid; int idx; for (idx = 0; idx < FF_LAYOUT_MIRROR_COUNT(lseg); idx++) { mirror = FF_LAYOUT_COMP(lseg, idx); if (mirror && mirror->mirror_ds) { devid = &mirror->mirror_ds->id_node; if (!ff_layout_test_devid_unavailable(devid)) return true; } } return false; } module_param(dataserver_retrans, uint, 0644); MODULE_PARM_DESC(dataserver_retrans, "The number of times the NFSv4.1 client " "retries a request before it attempts further " " recovery action."); module_param(dataserver_timeo, uint, 0644); MODULE_PARM_DESC(dataserver_timeo, "The time (in tenths of a second) the " "NFSv4.1 client waits for a response from a " " data server before it retries an NFS request.");