| /* |
| * Device operations for the pnfs nfs4 file layout driver. |
| * |
| * Copyright (c) 2014, Primary Data, Inc. All rights reserved. |
| * |
| * Tao Peng <bergwolf@primarydata.com> |
| */ |
| |
| #include <linux/nfs_fs.h> |
| #include <linux/vmalloc.h> |
| #include <linux/module.h> |
| #include <linux/sunrpc/addr.h> |
| |
| #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 void ff_layout_mark_devid_invalid(struct pnfs_layout_segment *lseg, |
| struct nfs4_deviceid_node *devid) |
| { |
| nfs4_mark_deviceid_unavailable(devid); |
| if (!ff_layout_has_available_ds(lseg)) |
| pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode, |
| lseg); |
| } |
| |
| static bool ff_layout_mirror_valid(struct pnfs_layout_segment *lseg, |
| struct nfs4_ff_layout_mirror *mirror) |
| { |
| if (mirror == NULL || mirror->mirror_ds == NULL) { |
| pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode, |
| lseg); |
| return false; |
| } |
| if (mirror->mirror_ds->ds == NULL) { |
| struct nfs4_deviceid_node *devid; |
| devid = &mirror->mirror_ds->id_node; |
| ff_layout_mark_devid_invalid(lseg, devid); |
| return false; |
| } |
| return true; |
| } |
| |
| 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; |
| |
| if (!ff_layout_mirror_valid(lseg, mirror)) { |
| pr_err_ratelimited("NFS: %s: No data server for mirror offset index %d\n", |
| __func__, mirror_idx); |
| 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 (!ff_layout_mirror_valid(lseg, mirror)) { |
| pr_err_ratelimited("NFS: %s: No data server for offset index %d\n", |
| __func__, ds_idx); |
| 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_update_creds; |
| |
| 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); |
| } |
| } |
| } |
| out_update_creds: |
| 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) |
| * + array length + deviceid(NFS4_DEVICEID4_SIZE) |
| * + status(4) + opnum(4) |
| */ |
| p = xdr_reserve_space(xdr, |
| 28 + 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); |
| /* Encode 1 error */ |
| *p++ = cpu_to_be32(1); |
| 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; |
| } |
| |
| static bool ff_read_layout_has_available_ds(struct pnfs_layout_segment *lseg) |
| { |
| struct nfs4_ff_layout_mirror *mirror; |
| struct nfs4_deviceid_node *devid; |
| u32 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; |
| } |
| |
| static bool ff_rw_layout_has_available_ds(struct pnfs_layout_segment *lseg) |
| { |
| struct nfs4_ff_layout_mirror *mirror; |
| struct nfs4_deviceid_node *devid; |
| u32 idx; |
| |
| for (idx = 0; idx < FF_LAYOUT_MIRROR_COUNT(lseg); idx++) { |
| mirror = FF_LAYOUT_COMP(lseg, idx); |
| if (!mirror || !mirror->mirror_ds) |
| return false; |
| devid = &mirror->mirror_ds->id_node; |
| if (ff_layout_test_devid_unavailable(devid)) |
| return false; |
| } |
| |
| return FF_LAYOUT_MIRROR_COUNT(lseg) != 0; |
| } |
| |
| bool ff_layout_has_available_ds(struct pnfs_layout_segment *lseg) |
| { |
| if (lseg->pls_range.iomode == IOMODE_READ) |
| return ff_read_layout_has_available_ds(lseg); |
| /* Note: RW layout needs all mirrors available */ |
| return ff_rw_layout_has_available_ds(lseg); |
| } |
| |
| 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."); |