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#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 = NFS_DEF_TCP_TIMEO;static unsigned int dataserver_retrans;static unsigned int dataserver_nconnect;
static bool ff_layout_has_available_ds(struct pnfs_layout_segment *lseg);
void nfs4_ff_layout_put_deviceid(struct nfs4_ff_layout_ds *mirror_ds){ if (!IS_ERR_OR_NULL(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(mirror_ds->ds_versions); 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 folio *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; struct net *net = server->nfs_client->cl_net; u32 mp_count; u32 version_count; __be32 *p; int i, ret = -ENOMEM;
/* set up xdr stream */ scratch = folio_alloc(gfp_flags, 0); if (!scratch) goto out_err;
new_ds = kzalloc_obj(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_folio(&stream, scratch);
/* 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(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);
if (version_count == 0) { ret = -EINVAL; goto out_err_drain_dsaddrs; } dprintk("%s: version count %d\n", __func__, version_count);
ds_versions = kzalloc_objs(struct nfs4_ff_ds_version, version_count, gfp_flags); if (!ds_versions) goto out_err_drain_dsaddrs;
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_io_size(be32_to_cpup(p++), server->nfs_client->cl_proto); ds_versions[i].wsize = nfs_io_size(be32_to_cpup(p++), server->nfs_client->cl_proto); 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;
/* * check for valid major/minor combination. * currently we support dataserver which talk: * v3, v4.0, v4.1, v4.2 */ if (!((ds_versions[i].version == 3 && ds_versions[i].minor_version == 0) || (ds_versions[i].version == 4 && ds_versions[i].minor_version < 3))) { 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(net, &dsaddrs, ds_versions[0].version, gfp_flags); if (!new_ds->ds) goto out_err_drain_dsaddrs;
/* If DS was already in cache, free ds addrs */ nfs4_pnfs_ds_addr_list_free(&dsaddrs);
folio_put(scratch); return new_ds;
out_err_drain_dsaddrs: nfs4_pnfs_ds_addr_list_free(&dsaddrs);
kfree(ds_versions);out_scratch: folio_put(scratch);out_err: kfree(new_ds);
dprintk("%s ERROR: returning %d\n", __func__, ret); return NULL;}
static void extend_ds_error(struct nfs4_ff_layout_ds_err *err, u64 offset, u64 length){ u64 end;
end = max_t(u64, pnfs_end_offset(err->offset, err->length), pnfs_end_offset(offset, length)); err->offset = min_t(u64, err->offset, offset); err->length = end - err->offset;}
static intff_ds_error_match(const struct nfs4_ff_layout_ds_err *e1, const struct nfs4_ff_layout_ds_err *e2){ int ret;
if (e1->opnum != e2->opnum) return e1->opnum < e2->opnum ? -1 : 1; if (e1->status != e2->status) return e1->status < e2->status ? -1 : 1; ret = memcmp(e1->stateid.data, e2->stateid.data, sizeof(e1->stateid.data)); if (ret != 0) return ret; ret = memcmp(&e1->deviceid, &e2->deviceid, sizeof(e1->deviceid)); if (ret != 0) return ret; if (pnfs_end_offset(e1->offset, e1->length) < e2->offset) return -1; if (e1->offset > pnfs_end_offset(e2->offset, e2->length)) return 1; /* If ranges overlap or are contiguous, they are the same */ return 0;}
static voidff_layout_add_ds_error_locked(struct nfs4_flexfile_layout *flo, struct nfs4_ff_layout_ds_err *dserr){ struct nfs4_ff_layout_ds_err *err, *tmp; struct list_head *head = &flo->error_list; int match;
/* Do insertion sort w/ merges */ list_for_each_entry_safe(err, tmp, &flo->error_list, list) { match = ff_ds_error_match(err, dserr); if (match < 0) continue; if (match > 0) { /* Add entry "dserr" _before_ entry "err" */ head = &err->list; break; } /* Entries match, so merge "err" into "dserr" */ extend_ds_error(dserr, err->offset, err->length); list_replace(&err->list, &dserr->list); kfree(err); return; }
list_add_tail(&dserr->list, head);}
int ff_layout_track_ds_error(struct nfs4_flexfile_layout *flo, struct nfs4_ff_layout_mirror *mirror, const struct nfs4_deviceid_node *devid, u32 dss_id, u64 offset, u64 length, int status, enum nfs_opnum4 opnum, gfp_t gfp_flags){ struct nfs4_ff_layout_ds_err *dserr;
if (status == 0) return 0;
if (devid == NULL) return -EINVAL;
dserr = kmalloc_obj(*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->dss[dss_id].stateid); memcpy(&dserr->deviceid, &devid->deviceid, NFS4_DEVICEID4_SIZE);
spin_lock(&flo->generic_hdr.plh_inode->i_lock); ff_layout_add_ds_error_locked(flo, dserr); spin_unlock(&flo->generic_hdr.plh_inode->i_lock); return 0;}
static const struct cred *ff_layout_get_mirror_cred(struct nfs4_ff_layout_mirror *mirror, u32 iomode, u32 dss_id){ const struct cred *cred, __rcu **pcred;
if (iomode == IOMODE_READ) pcred = &mirror->dss[dss_id].ro_cred; else pcred = &mirror->dss[dss_id].rw_cred;
rcu_read_lock(); do { cred = rcu_dereference(*pcred); if (!cred) break;
cred = get_cred_rcu(cred); } while(!cred); rcu_read_unlock(); return cred;}
struct nfs_fh *nfs4_ff_layout_select_ds_fh(struct nfs4_ff_layout_mirror *mirror, u32 dss_id){ /* FIXME: For now assume there is only 1 version available for the DS */ return &mirror->dss[dss_id].fh_versions[0];}
voidnfs4_ff_layout_select_ds_stateid(const struct nfs4_ff_layout_mirror *mirror, const struct nfs4_ff_layout_ds *mirror_ds, u32 dss_id, nfs4_stateid *stateid){ if (nfs4_ff_layout_ds_version(mirror_ds) == 4) nfs4_stateid_copy(stateid, &mirror->dss[dss_id].stateid);}
/* * Resolve the stripe's deviceid on first use and pin the node on the * mirror. Returns a node the caller must put, or an ERR_PTR. */struct nfs4_ff_layout_ds *ff_layout_get_mirror_ds(struct pnfs_layout_hdr *lo, struct nfs4_ff_layout_mirror *mirror, u32 dss_id){ struct nfs4_ff_layout_ds *mirror_ds, *old; struct nfs4_deviceid_node *node;
if (mirror == NULL) return ERR_PTR(-ENODEV);
retry: rcu_read_lock(); mirror_ds = rcu_dereference(mirror->dss[dss_id].mirror_ds); if (mirror_ds && !IS_ERR(mirror_ds) && atomic_inc_not_zero(&mirror_ds->id_node.ref)) { rcu_read_unlock(); return mirror_ds; } rcu_read_unlock(); if (IS_ERR(mirror_ds)) return mirror_ds; if (mirror_ds != NULL) /* raced with a reset; the field is being re-pointed */ goto retry;
node = nfs4_find_get_deviceid(NFS_SERVER(lo->plh_inode), &mirror->dss[dss_id].devid, lo->plh_lc_cred, GFP_KERNEL); if (node) { mirror_ds = FF_LAYOUT_MIRROR_DS(node); /* * Take the caller's reference before the pointer becomes * visible below, so a concurrent reset of the installed * pointer cannot drop the last reference under us. */ atomic_inc(&node->ref); } else { mirror_ds = ERR_PTR(-ENODEV); }
/* check for race with another call to this function */ old = unrcu_pointer(cmpxchg(&mirror->dss[dss_id].mirror_ds, NULL, RCU_INITIALIZER(mirror_ds))); if (old == NULL) return mirror_ds;
/* lost the race; use the winner's node instead */ if (node) { nfs4_put_deviceid_node(node); nfs4_put_deviceid_node(node); } goto retry;}
/** * nfs4_ff_layout_prepare_ds - prepare a DS connection for an RPC call * @lseg: the layout segment we're operating on * @mirror: layout mirror describing the DS to use * @mirror_ds: referenced device node for the stripe, from * ff_layout_get_mirror_ds() (may be an ERR_PTR) * @dss_id: DS stripe id to select stripe to use * @opnum: operation this connection is being prepared for * * Try to prepare a DS connection to accept an RPC call. This involves * selecting a mirror to use and connecting the client to it if it's not * already connected. * * Since we only need a single functioning mirror to satisfy a read, we don't * want to return the layout if there is one. For writes though, any down * mirror should result in a LAYOUTRETURN. @opnum is how we distinguish * between the two cases. On failure, @opnum is also reported in the tracked * device error so that the server can tell which class of I/O the client * was unable to send to the mirror. * * Returns a pointer to a connected DS object on success or an ERR_PTR value on failure. */struct nfs4_pnfs_ds *nfs4_ff_layout_prepare_ds(struct pnfs_layout_segment *lseg, struct nfs4_ff_layout_mirror *mirror, struct nfs4_ff_layout_ds *mirror_ds, u32 dss_id, enum nfs_opnum4 opnum){ struct nfs4_pnfs_ds *ds; struct inode *ino = lseg->pls_layout->plh_inode; struct nfs_server *s = NFS_SERVER(ino); unsigned int max_payload; int status = -EAGAIN;
if (IS_ERR_OR_NULL(mirror_ds)) goto noconnect;
ds = mirror_ds->ds; if (READ_ONCE(ds->ds_clp)) goto out; /* matching smp_wmb() in _nfs4_pnfs_v3/4_ds_connect */ smp_rmb();
/* FIXME: For now we assume the server sent only one version of NFS * to use for the DS. */ status = nfs4_pnfs_ds_connect(s, ds, &mirror_ds->id_node, dataserver_timeo, dataserver_retrans, dataserver_nconnect, mirror_ds->ds_versions[0].version, mirror_ds->ds_versions[0].minor_version, mirror_ds->ds_versions[0].tightly_coupled);
/* connect success, check rsize/wsize limit */ if (!status) { /* * ds_clp is put in destroy_ds(). * keep ds_clp even if DS is local, so that if local IO cannot * proceed somehow, we can fall back to NFS whenever we want. */ nfs_local_probe_async(ds->ds_clp); max_payload = nfs_block_size(rpc_max_payload(ds->ds_clp->cl_rpcclient), NULL); if (mirror_ds->ds_versions[0].rsize > max_payload) mirror_ds->ds_versions[0].rsize = max_payload; if (mirror_ds->ds_versions[0].wsize > max_payload) mirror_ds->ds_versions[0].wsize = max_payload; goto out; } /* The connect was interrupted by a signal: this is not a DS error */ if (status == -ERESTARTSYS || status == -EINTR) { ds = ERR_PTR(status); goto out; }noconnect: ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout), mirror, IS_ERR_OR_NULL(mirror_ds) ? NULL : &mirror_ds->id_node, dss_id, lseg->pls_range.offset, lseg->pls_range.length, NFS4ERR_NXIO, opnum, GFP_NOIO); ff_layout_send_layouterror(lseg); if (opnum != OP_READ || !ff_layout_has_available_ds(lseg)) pnfs_error_mark_layout_for_return(ino, lseg, &mirror->dss[dss_id].devid); ds = ERR_PTR(status);out: return ds;}
const struct cred *ff_layout_get_ds_cred(struct nfs4_ff_layout_mirror *mirror, const struct pnfs_layout_range *range, const struct cred *mdscred, const struct nfs4_ff_layout_ds *mirror_ds, u32 dss_id){ const struct cred *cred;
if (mirror && !mirror_ds->ds_versions[0].tightly_coupled) { cred = ff_layout_get_mirror_cred(mirror, range->iomode, dss_id); if (!cred) cred = get_cred(mdscred); } else { cred = get_cred(mdscred); } return cred;}
/** * nfs4_ff_find_or_create_ds_client - Find or create a DS rpc client * @mirror_ds: device node for the stripe * @ds_clp: nfs_client for the DS * @inode: pointer to inode * * 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(const struct nfs4_ff_layout_ds *mirror_ds, struct nfs_client *ds_clp, struct inode *inode){ switch (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(); }}
void ff_layout_free_ds_ioerr(struct list_head *head){ struct nfs4_ff_layout_ds_err *err;
while (!list_empty(head)) { err = list_first_entry(head, struct nfs4_ff_layout_ds_err, list); list_del(&err->list); kfree(err); }}
/* called with inode i_lock held */int ff_layout_encode_ds_ioerr(struct xdr_stream *xdr, const struct list_head *head){ struct nfs4_ff_layout_ds_err *err; __be32 *p;
list_for_each_entry(err, head, list) { /* 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); dprintk("%s: offset %llu length %llu status %d op %d\n", __func__, err->offset, err->length, err->status, err->opnum); }
return 0;}
staticunsigned int do_layout_fetch_ds_ioerr(struct pnfs_layout_hdr *lo, const struct pnfs_layout_range *range, struct list_head *head, unsigned int maxnum){ struct nfs4_flexfile_layout *flo = FF_LAYOUT_FROM_HDR(lo); struct inode *inode = lo->plh_inode; struct nfs4_ff_layout_ds_err *err, *n; unsigned int ret = 0;
spin_lock(&inode->i_lock); list_for_each_entry_safe(err, n, &flo->error_list, list) { if (!pnfs_is_range_intersecting(err->offset, pnfs_end_offset(err->offset, err->length), range->offset, pnfs_end_offset(range->offset, range->length))) continue; if (!maxnum) break; list_move(&err->list, head); maxnum--; ret++; } spin_unlock(&inode->i_lock); return ret;}
unsigned int ff_layout_fetch_ds_ioerr(struct pnfs_layout_hdr *lo, const struct pnfs_layout_range *range, struct list_head *head, unsigned int maxnum){ unsigned int ret;
ret = do_layout_fetch_ds_ioerr(lo, range, head, maxnum); /* If we're over the max, discard all remaining entries */ if (ret == maxnum) { LIST_HEAD(discard); do_layout_fetch_ds_ioerr(lo, range, &discard, -1); ff_layout_free_ds_ioerr(&discard); } return ret;}
static bool ff_read_layout_has_available_ds(struct pnfs_layout_segment *lseg){ struct nfs4_ff_layout_mirror *mirror; struct nfs4_ff_layout_ds *mirror_ds; bool ret = false; u32 idx, dss_id;
rcu_read_lock(); for (idx = 0; idx < FF_LAYOUT_MIRROR_COUNT(lseg); idx++) { mirror = FF_LAYOUT_COMP(lseg, idx); if (!mirror) continue; for (dss_id = 0; dss_id < mirror->dss_count; dss_id++) { mirror_ds = rcu_dereference(mirror->dss[dss_id].mirror_ds); if (!mirror_ds) { ret = true; goto out; } if (IS_ERR(mirror_ds)) continue; if (!nfs4_test_deviceid_unavailable(&mirror_ds->id_node)) { ret = true; goto out; } } }out: rcu_read_unlock(); return ret;}
static bool ff_rw_layout_has_available_ds(struct pnfs_layout_segment *lseg){ struct nfs4_ff_layout_mirror *mirror; struct nfs4_ff_layout_ds *mirror_ds; bool ret = false; u32 idx, dss_id;
rcu_read_lock(); for (idx = 0; idx < FF_LAYOUT_MIRROR_COUNT(lseg); idx++) { mirror = FF_LAYOUT_COMP(lseg, idx); if (!mirror) goto out; for (dss_id = 0; dss_id < mirror->dss_count; dss_id++) { mirror_ds = rcu_dereference(mirror->dss[dss_id].mirror_ds); if (IS_ERR(mirror_ds)) goto out; if (!mirror_ds) continue; if (nfs4_test_deviceid_unavailable(&mirror_ds->id_node)) goto out; } } ret = FF_LAYOUT_MIRROR_COUNT(lseg) != 0;out: rcu_read_unlock(); return ret;}
static 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);}
bool ff_layout_avoid_mds_available_ds(struct pnfs_layout_segment *lseg){ return ff_layout_no_fallback_to_mds(lseg) || ff_layout_has_available_ds(lseg);}
bool ff_layout_avoid_read_on_rw(struct pnfs_layout_segment *lseg){ return lseg->pls_range.iomode == IOMODE_RW && ff_layout_no_read_on_rw(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.");module_param(dataserver_nconnect, uint, 0644);MODULE_PARM_DESC(dataserver_nconnect, "The maximum number of connections " "the NFSv4.1 client opens to each data server, " "capping the value inherited from the MDS nconnect " "mount option. 0 (default) applies no cap.");