forked from Minki/linux
8e04fdfadd
mirror->mirror_ds can be NULL if uninitialised, but can contain
a PTR_ERR() if call to GETDEVICEINFO failed.
Fixes: 65990d1afb
("pNFS/flexfiles: Fix a deadlock on LAYOUTGET")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Cc: stable@vger.kernel.org # 4.10+
620 lines
17 KiB
C
620 lines
17 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Device operations for the pnfs nfs4 file layout driver.
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*
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* Copyright (c) 2014, Primary Data, Inc. All rights reserved.
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*
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* Tao Peng <bergwolf@primarydata.com>
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*/
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#include <linux/nfs_fs.h>
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#include <linux/vmalloc.h>
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#include <linux/module.h>
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#include <linux/sunrpc/addr.h>
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#include "../internal.h"
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#include "../nfs4session.h"
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#include "flexfilelayout.h"
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#define NFSDBG_FACILITY NFSDBG_PNFS_LD
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static unsigned int dataserver_timeo = NFS_DEF_TCP_TIMEO;
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static unsigned int dataserver_retrans;
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static bool ff_layout_has_available_ds(struct pnfs_layout_segment *lseg);
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void nfs4_ff_layout_put_deviceid(struct nfs4_ff_layout_ds *mirror_ds)
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{
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if (!IS_ERR_OR_NULL(mirror_ds))
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nfs4_put_deviceid_node(&mirror_ds->id_node);
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}
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void nfs4_ff_layout_free_deviceid(struct nfs4_ff_layout_ds *mirror_ds)
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{
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nfs4_print_deviceid(&mirror_ds->id_node.deviceid);
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nfs4_pnfs_ds_put(mirror_ds->ds);
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kfree(mirror_ds->ds_versions);
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kfree_rcu(mirror_ds, id_node.rcu);
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}
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/* Decode opaque device data and construct new_ds using it */
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struct nfs4_ff_layout_ds *
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nfs4_ff_alloc_deviceid_node(struct nfs_server *server, struct pnfs_device *pdev,
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gfp_t gfp_flags)
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{
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struct xdr_stream stream;
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struct xdr_buf buf;
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struct page *scratch;
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struct list_head dsaddrs;
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struct nfs4_pnfs_ds_addr *da;
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struct nfs4_ff_layout_ds *new_ds = NULL;
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struct nfs4_ff_ds_version *ds_versions = NULL;
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u32 mp_count;
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u32 version_count;
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__be32 *p;
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int i, ret = -ENOMEM;
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/* set up xdr stream */
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scratch = alloc_page(gfp_flags);
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if (!scratch)
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goto out_err;
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new_ds = kzalloc(sizeof(struct nfs4_ff_layout_ds), gfp_flags);
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if (!new_ds)
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goto out_scratch;
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nfs4_init_deviceid_node(&new_ds->id_node,
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server,
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&pdev->dev_id);
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INIT_LIST_HEAD(&dsaddrs);
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xdr_init_decode_pages(&stream, &buf, pdev->pages, pdev->pglen);
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xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE);
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/* multipath count */
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p = xdr_inline_decode(&stream, 4);
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if (unlikely(!p))
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goto out_err_drain_dsaddrs;
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mp_count = be32_to_cpup(p);
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dprintk("%s: multipath ds count %d\n", __func__, mp_count);
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for (i = 0; i < mp_count; i++) {
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/* multipath ds */
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da = nfs4_decode_mp_ds_addr(server->nfs_client->cl_net,
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&stream, gfp_flags);
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if (da)
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list_add_tail(&da->da_node, &dsaddrs);
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}
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if (list_empty(&dsaddrs)) {
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dprintk("%s: no suitable DS addresses found\n",
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__func__);
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ret = -ENOMEDIUM;
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goto out_err_drain_dsaddrs;
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}
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/* version count */
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p = xdr_inline_decode(&stream, 4);
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if (unlikely(!p))
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goto out_err_drain_dsaddrs;
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version_count = be32_to_cpup(p);
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dprintk("%s: version count %d\n", __func__, version_count);
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ds_versions = kcalloc(version_count,
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sizeof(struct nfs4_ff_ds_version),
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gfp_flags);
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if (!ds_versions)
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goto out_scratch;
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for (i = 0; i < version_count; i++) {
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/* 20 = version(4) + minor_version(4) + rsize(4) + wsize(4) +
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* tightly_coupled(4) */
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p = xdr_inline_decode(&stream, 20);
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if (unlikely(!p))
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goto out_err_drain_dsaddrs;
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ds_versions[i].version = be32_to_cpup(p++);
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ds_versions[i].minor_version = be32_to_cpup(p++);
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ds_versions[i].rsize = nfs_block_size(be32_to_cpup(p++), NULL);
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ds_versions[i].wsize = nfs_block_size(be32_to_cpup(p++), NULL);
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ds_versions[i].tightly_coupled = be32_to_cpup(p);
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if (ds_versions[i].rsize > NFS_MAX_FILE_IO_SIZE)
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ds_versions[i].rsize = NFS_MAX_FILE_IO_SIZE;
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if (ds_versions[i].wsize > NFS_MAX_FILE_IO_SIZE)
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ds_versions[i].wsize = NFS_MAX_FILE_IO_SIZE;
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/*
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* check for valid major/minor combination.
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* currently we support dataserver which talk:
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* v3, v4.0, v4.1, v4.2
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*/
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if (!((ds_versions[i].version == 3 && ds_versions[i].minor_version == 0) ||
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(ds_versions[i].version == 4 && ds_versions[i].minor_version < 3))) {
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dprintk("%s: [%d] unsupported ds version %d-%d\n", __func__,
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i, ds_versions[i].version,
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ds_versions[i].minor_version);
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ret = -EPROTONOSUPPORT;
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goto out_err_drain_dsaddrs;
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}
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dprintk("%s: [%d] vers %u minor_ver %u rsize %u wsize %u coupled %d\n",
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__func__, i, ds_versions[i].version,
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ds_versions[i].minor_version,
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ds_versions[i].rsize,
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ds_versions[i].wsize,
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ds_versions[i].tightly_coupled);
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}
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new_ds->ds_versions = ds_versions;
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new_ds->ds_versions_cnt = version_count;
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new_ds->ds = nfs4_pnfs_ds_add(&dsaddrs, gfp_flags);
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if (!new_ds->ds)
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goto out_err_drain_dsaddrs;
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/* If DS was already in cache, free ds addrs */
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while (!list_empty(&dsaddrs)) {
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da = list_first_entry(&dsaddrs,
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struct nfs4_pnfs_ds_addr,
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da_node);
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list_del_init(&da->da_node);
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kfree(da->da_remotestr);
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kfree(da);
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}
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__free_page(scratch);
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return new_ds;
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out_err_drain_dsaddrs:
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while (!list_empty(&dsaddrs)) {
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da = list_first_entry(&dsaddrs, struct nfs4_pnfs_ds_addr,
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da_node);
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list_del_init(&da->da_node);
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kfree(da->da_remotestr);
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kfree(da);
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}
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kfree(ds_versions);
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out_scratch:
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__free_page(scratch);
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out_err:
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kfree(new_ds);
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dprintk("%s ERROR: returning %d\n", __func__, ret);
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return NULL;
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}
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static void extend_ds_error(struct nfs4_ff_layout_ds_err *err,
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u64 offset, u64 length)
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{
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u64 end;
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end = max_t(u64, pnfs_end_offset(err->offset, err->length),
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pnfs_end_offset(offset, length));
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err->offset = min_t(u64, err->offset, offset);
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err->length = end - err->offset;
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}
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static int
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ff_ds_error_match(const struct nfs4_ff_layout_ds_err *e1,
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const struct nfs4_ff_layout_ds_err *e2)
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{
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int ret;
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if (e1->opnum != e2->opnum)
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return e1->opnum < e2->opnum ? -1 : 1;
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if (e1->status != e2->status)
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return e1->status < e2->status ? -1 : 1;
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ret = memcmp(e1->stateid.data, e2->stateid.data,
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sizeof(e1->stateid.data));
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if (ret != 0)
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return ret;
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ret = memcmp(&e1->deviceid, &e2->deviceid, sizeof(e1->deviceid));
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if (ret != 0)
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return ret;
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if (pnfs_end_offset(e1->offset, e1->length) < e2->offset)
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return -1;
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if (e1->offset > pnfs_end_offset(e2->offset, e2->length))
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return 1;
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/* If ranges overlap or are contiguous, they are the same */
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return 0;
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}
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static void
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ff_layout_add_ds_error_locked(struct nfs4_flexfile_layout *flo,
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struct nfs4_ff_layout_ds_err *dserr)
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{
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struct nfs4_ff_layout_ds_err *err, *tmp;
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struct list_head *head = &flo->error_list;
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int match;
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/* Do insertion sort w/ merges */
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list_for_each_entry_safe(err, tmp, &flo->error_list, list) {
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match = ff_ds_error_match(err, dserr);
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if (match < 0)
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continue;
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if (match > 0) {
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/* Add entry "dserr" _before_ entry "err" */
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head = &err->list;
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break;
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}
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/* Entries match, so merge "err" into "dserr" */
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extend_ds_error(dserr, err->offset, err->length);
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list_replace(&err->list, &dserr->list);
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kfree(err);
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return;
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}
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list_add_tail(&dserr->list, head);
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}
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int ff_layout_track_ds_error(struct nfs4_flexfile_layout *flo,
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struct nfs4_ff_layout_mirror *mirror, u64 offset,
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u64 length, int status, enum nfs_opnum4 opnum,
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gfp_t gfp_flags)
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{
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struct nfs4_ff_layout_ds_err *dserr;
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if (status == 0)
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return 0;
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if (IS_ERR_OR_NULL(mirror->mirror_ds))
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return -EINVAL;
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dserr = kmalloc(sizeof(*dserr), gfp_flags);
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if (!dserr)
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return -ENOMEM;
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INIT_LIST_HEAD(&dserr->list);
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dserr->offset = offset;
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dserr->length = length;
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dserr->status = status;
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dserr->opnum = opnum;
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nfs4_stateid_copy(&dserr->stateid, &mirror->stateid);
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memcpy(&dserr->deviceid, &mirror->mirror_ds->id_node.deviceid,
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NFS4_DEVICEID4_SIZE);
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spin_lock(&flo->generic_hdr.plh_inode->i_lock);
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ff_layout_add_ds_error_locked(flo, dserr);
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spin_unlock(&flo->generic_hdr.plh_inode->i_lock);
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return 0;
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}
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static const struct cred *
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ff_layout_get_mirror_cred(struct nfs4_ff_layout_mirror *mirror, u32 iomode)
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{
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const struct cred *cred, __rcu **pcred;
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if (iomode == IOMODE_READ)
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pcred = &mirror->ro_cred;
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else
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pcred = &mirror->rw_cred;
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rcu_read_lock();
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do {
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cred = rcu_dereference(*pcred);
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if (!cred)
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break;
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cred = get_cred_rcu(cred);
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} while(!cred);
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rcu_read_unlock();
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return cred;
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}
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struct nfs_fh *
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nfs4_ff_layout_select_ds_fh(struct nfs4_ff_layout_mirror *mirror)
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{
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/* FIXME: For now assume there is only 1 version available for the DS */
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return &mirror->fh_versions[0];
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}
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void
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nfs4_ff_layout_select_ds_stateid(const struct nfs4_ff_layout_mirror *mirror,
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nfs4_stateid *stateid)
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{
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if (nfs4_ff_layout_ds_version(mirror) == 4)
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nfs4_stateid_copy(stateid, &mirror->stateid);
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}
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static bool
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ff_layout_init_mirror_ds(struct pnfs_layout_hdr *lo,
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struct nfs4_ff_layout_mirror *mirror)
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{
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if (mirror == NULL)
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goto outerr;
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if (mirror->mirror_ds == NULL) {
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struct nfs4_deviceid_node *node;
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struct nfs4_ff_layout_ds *mirror_ds = ERR_PTR(-ENODEV);
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node = nfs4_find_get_deviceid(NFS_SERVER(lo->plh_inode),
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&mirror->devid, lo->plh_lc_cred,
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GFP_KERNEL);
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if (node)
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mirror_ds = FF_LAYOUT_MIRROR_DS(node);
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/* check for race with another call to this function */
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if (cmpxchg(&mirror->mirror_ds, NULL, mirror_ds) &&
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mirror_ds != ERR_PTR(-ENODEV))
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nfs4_put_deviceid_node(node);
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}
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if (IS_ERR(mirror->mirror_ds))
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goto outerr;
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return true;
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outerr:
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return false;
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}
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/**
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* nfs4_ff_layout_prepare_ds - prepare a DS connection for an RPC call
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* @lseg: the layout segment we're operating on
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* @mirror: layout mirror describing the DS to use
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* @fail_return: return layout on connect failure?
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*
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* Try to prepare a DS connection to accept an RPC call. This involves
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* selecting a mirror to use and connecting the client to it if it's not
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* already connected.
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*
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* Since we only need a single functioning mirror to satisfy a read, we don't
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* want to return the layout if there is one. For writes though, any down
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* mirror should result in a LAYOUTRETURN. @fail_return is how we distinguish
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* between the two cases.
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*
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* Returns a pointer to a connected DS object on success or NULL on failure.
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*/
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struct nfs4_pnfs_ds *
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nfs4_ff_layout_prepare_ds(struct pnfs_layout_segment *lseg,
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struct nfs4_ff_layout_mirror *mirror,
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bool fail_return)
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{
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struct nfs4_pnfs_ds *ds = NULL;
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struct inode *ino = lseg->pls_layout->plh_inode;
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struct nfs_server *s = NFS_SERVER(ino);
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unsigned int max_payload;
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int status;
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if (!ff_layout_init_mirror_ds(lseg->pls_layout, mirror))
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goto noconnect;
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ds = mirror->mirror_ds->ds;
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/* matching smp_wmb() in _nfs4_pnfs_v3/4_ds_connect */
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smp_rmb();
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if (ds->ds_clp)
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goto out;
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/* FIXME: For now we assume the server sent only one version of NFS
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* to use for the DS.
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*/
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status = nfs4_pnfs_ds_connect(s, ds, &mirror->mirror_ds->id_node,
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dataserver_timeo, dataserver_retrans,
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mirror->mirror_ds->ds_versions[0].version,
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mirror->mirror_ds->ds_versions[0].minor_version);
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/* connect success, check rsize/wsize limit */
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if (!status) {
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max_payload =
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nfs_block_size(rpc_max_payload(ds->ds_clp->cl_rpcclient),
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NULL);
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if (mirror->mirror_ds->ds_versions[0].rsize > max_payload)
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mirror->mirror_ds->ds_versions[0].rsize = max_payload;
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if (mirror->mirror_ds->ds_versions[0].wsize > max_payload)
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mirror->mirror_ds->ds_versions[0].wsize = max_payload;
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goto out;
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}
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noconnect:
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ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),
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mirror, lseg->pls_range.offset,
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lseg->pls_range.length, NFS4ERR_NXIO,
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OP_ILLEGAL, GFP_NOIO);
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ff_layout_send_layouterror(lseg);
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if (fail_return || !ff_layout_has_available_ds(lseg))
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pnfs_error_mark_layout_for_return(ino, lseg);
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ds = NULL;
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out:
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return ds;
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}
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const struct cred *
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ff_layout_get_ds_cred(struct nfs4_ff_layout_mirror *mirror,
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const struct pnfs_layout_range *range,
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const struct cred *mdscred)
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{
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const struct cred *cred;
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if (mirror && !mirror->mirror_ds->ds_versions[0].tightly_coupled) {
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cred = ff_layout_get_mirror_cred(mirror, range->iomode);
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if (!cred)
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cred = get_cred(mdscred);
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} else {
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cred = get_cred(mdscred);
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}
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return cred;
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}
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/**
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* nfs4_ff_find_or_create_ds_client - Find or create a DS rpc client
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* @mirror: pointer to the mirror
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* @ds_clp: nfs_client for the DS
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* @inode: pointer to inode
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*
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* Find or create a DS rpc client with th MDS server rpc client auth flavor
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* in the nfs_client cl_ds_clients list.
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*/
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struct rpc_clnt *
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nfs4_ff_find_or_create_ds_client(struct nfs4_ff_layout_mirror *mirror,
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struct nfs_client *ds_clp, struct inode *inode)
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{
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switch (mirror->mirror_ds->ds_versions[0].version) {
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case 3:
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/* For NFSv3 DS, flavor is set when creating DS connections */
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return ds_clp->cl_rpcclient;
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case 4:
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return nfs4_find_or_create_ds_client(ds_clp, inode);
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default:
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BUG();
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}
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}
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void ff_layout_free_ds_ioerr(struct list_head *head)
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{
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struct nfs4_ff_layout_ds_err *err;
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while (!list_empty(head)) {
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err = list_first_entry(head,
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struct nfs4_ff_layout_ds_err,
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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;
|
|
}
|
|
|
|
static
|
|
unsigned 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_deviceid_node *devid;
|
|
u32 idx;
|
|
|
|
for (idx = 0; idx < FF_LAYOUT_MIRROR_COUNT(lseg); idx++) {
|
|
mirror = FF_LAYOUT_COMP(lseg, idx);
|
|
if (mirror) {
|
|
if (!mirror->mirror_ds)
|
|
return true;
|
|
if (IS_ERR(mirror->mirror_ds))
|
|
continue;
|
|
devid = &mirror->mirror_ds->id_node;
|
|
if (!nfs4_test_deviceid_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 || IS_ERR(mirror->mirror_ds))
|
|
return false;
|
|
if (!mirror->mirror_ds)
|
|
continue;
|
|
devid = &mirror->mirror_ds->id_node;
|
|
if (nfs4_test_deviceid_unavailable(devid))
|
|
return false;
|
|
}
|
|
|
|
return FF_LAYOUT_MIRROR_COUNT(lseg) != 0;
|
|
}
|
|
|
|
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.");
|