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![Anna Schumaker](/assets/img/avatar_default.png)
The comma at the end of the line was leftover from an earlier refactor
of the _nfs4_pnfs_v3_ds_connect() function. This is technically valid C,
so the compilers didn't catch it, but if I'm understanding how it works
correctly it assigns the return value of rpc_clnt_add_xprtr() to
xprtdata.cred.
Reported-by: Olga Kornievskaia <kolga@netapp.com>
Fixes: a12f996d34
("NFSv4/pNFS: Use connections to a DS that are all of the same protocol family")
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
1209 lines
30 KiB
C
1209 lines
30 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Common NFS I/O operations for the pnfs file based
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* layout drivers.
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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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* Tom Haynes <loghyr@primarydata.com>
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*/
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#include <linux/nfs_fs.h>
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#include <linux/nfs_page.h>
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#include <linux/sunrpc/addr.h>
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#include <linux/module.h>
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#include "nfs4session.h"
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#include "internal.h"
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#include "pnfs.h"
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#define NFSDBG_FACILITY NFSDBG_PNFS
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void pnfs_generic_rw_release(void *data)
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{
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struct nfs_pgio_header *hdr = data;
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nfs_put_client(hdr->ds_clp);
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hdr->mds_ops->rpc_release(data);
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}
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EXPORT_SYMBOL_GPL(pnfs_generic_rw_release);
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/* Fake up some data that will cause nfs_commit_release to retry the writes. */
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void pnfs_generic_prepare_to_resend_writes(struct nfs_commit_data *data)
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{
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struct nfs_writeverf *verf = data->res.verf;
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data->task.tk_status = 0;
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memset(&verf->verifier, 0, sizeof(verf->verifier));
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verf->committed = NFS_UNSTABLE;
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}
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EXPORT_SYMBOL_GPL(pnfs_generic_prepare_to_resend_writes);
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void pnfs_generic_write_commit_done(struct rpc_task *task, void *data)
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{
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struct nfs_commit_data *wdata = data;
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/* Note this may cause RPC to be resent */
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wdata->mds_ops->rpc_call_done(task, data);
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}
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EXPORT_SYMBOL_GPL(pnfs_generic_write_commit_done);
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void pnfs_generic_commit_release(void *calldata)
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{
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struct nfs_commit_data *data = calldata;
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data->completion_ops->completion(data);
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pnfs_put_lseg(data->lseg);
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nfs_put_client(data->ds_clp);
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nfs_commitdata_release(data);
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}
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EXPORT_SYMBOL_GPL(pnfs_generic_commit_release);
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static struct pnfs_layout_segment *
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pnfs_free_bucket_lseg(struct pnfs_commit_bucket *bucket)
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{
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if (list_empty(&bucket->committing) && list_empty(&bucket->written)) {
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struct pnfs_layout_segment *freeme = bucket->lseg;
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bucket->lseg = NULL;
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return freeme;
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}
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return NULL;
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}
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/* The generic layer is about to remove the req from the commit list.
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* If this will make the bucket empty, it will need to put the lseg reference.
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* Note this must be called holding nfsi->commit_mutex
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*/
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void
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pnfs_generic_clear_request_commit(struct nfs_page *req,
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struct nfs_commit_info *cinfo)
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{
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struct pnfs_commit_bucket *bucket = NULL;
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if (!test_and_clear_bit(PG_COMMIT_TO_DS, &req->wb_flags))
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goto out;
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cinfo->ds->nwritten--;
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if (list_is_singular(&req->wb_list))
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bucket = list_first_entry(&req->wb_list,
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struct pnfs_commit_bucket, written);
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out:
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nfs_request_remove_commit_list(req, cinfo);
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if (bucket)
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pnfs_put_lseg(pnfs_free_bucket_lseg(bucket));
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}
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EXPORT_SYMBOL_GPL(pnfs_generic_clear_request_commit);
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struct pnfs_commit_array *
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pnfs_alloc_commit_array(size_t n, gfp_t gfp_flags)
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{
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struct pnfs_commit_array *p;
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struct pnfs_commit_bucket *b;
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p = kmalloc(struct_size(p, buckets, n), gfp_flags);
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if (!p)
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return NULL;
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p->nbuckets = n;
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INIT_LIST_HEAD(&p->cinfo_list);
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INIT_LIST_HEAD(&p->lseg_list);
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p->lseg = NULL;
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for (b = &p->buckets[0]; n != 0; b++, n--) {
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INIT_LIST_HEAD(&b->written);
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INIT_LIST_HEAD(&b->committing);
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b->lseg = NULL;
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b->direct_verf.committed = NFS_INVALID_STABLE_HOW;
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}
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return p;
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}
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EXPORT_SYMBOL_GPL(pnfs_alloc_commit_array);
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void
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pnfs_free_commit_array(struct pnfs_commit_array *p)
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{
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kfree_rcu(p, rcu);
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}
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EXPORT_SYMBOL_GPL(pnfs_free_commit_array);
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static struct pnfs_commit_array *
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pnfs_find_commit_array_by_lseg(struct pnfs_ds_commit_info *fl_cinfo,
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struct pnfs_layout_segment *lseg)
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{
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struct pnfs_commit_array *array;
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list_for_each_entry_rcu(array, &fl_cinfo->commits, cinfo_list) {
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if (array->lseg == lseg)
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return array;
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}
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return NULL;
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}
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struct pnfs_commit_array *
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pnfs_add_commit_array(struct pnfs_ds_commit_info *fl_cinfo,
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struct pnfs_commit_array *new,
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struct pnfs_layout_segment *lseg)
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{
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struct pnfs_commit_array *array;
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array = pnfs_find_commit_array_by_lseg(fl_cinfo, lseg);
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if (array)
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return array;
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new->lseg = lseg;
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refcount_set(&new->refcount, 1);
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list_add_rcu(&new->cinfo_list, &fl_cinfo->commits);
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list_add(&new->lseg_list, &lseg->pls_commits);
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return new;
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}
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EXPORT_SYMBOL_GPL(pnfs_add_commit_array);
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static struct pnfs_commit_array *
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pnfs_lookup_commit_array(struct pnfs_ds_commit_info *fl_cinfo,
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struct pnfs_layout_segment *lseg)
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{
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struct pnfs_commit_array *array;
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rcu_read_lock();
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array = pnfs_find_commit_array_by_lseg(fl_cinfo, lseg);
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if (!array) {
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rcu_read_unlock();
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fl_cinfo->ops->setup_ds_info(fl_cinfo, lseg);
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rcu_read_lock();
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array = pnfs_find_commit_array_by_lseg(fl_cinfo, lseg);
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}
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rcu_read_unlock();
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return array;
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}
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static void
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pnfs_release_commit_array_locked(struct pnfs_commit_array *array)
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{
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list_del_rcu(&array->cinfo_list);
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list_del(&array->lseg_list);
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pnfs_free_commit_array(array);
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}
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static void
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pnfs_put_commit_array_locked(struct pnfs_commit_array *array)
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{
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if (refcount_dec_and_test(&array->refcount))
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pnfs_release_commit_array_locked(array);
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}
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static void
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pnfs_put_commit_array(struct pnfs_commit_array *array, struct inode *inode)
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{
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if (refcount_dec_and_lock(&array->refcount, &inode->i_lock)) {
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pnfs_release_commit_array_locked(array);
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spin_unlock(&inode->i_lock);
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}
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}
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static struct pnfs_commit_array *
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pnfs_get_commit_array(struct pnfs_commit_array *array)
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{
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if (refcount_inc_not_zero(&array->refcount))
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return array;
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return NULL;
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}
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static void
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pnfs_remove_and_free_commit_array(struct pnfs_commit_array *array)
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{
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array->lseg = NULL;
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list_del_init(&array->lseg_list);
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pnfs_put_commit_array_locked(array);
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}
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void
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pnfs_generic_ds_cinfo_release_lseg(struct pnfs_ds_commit_info *fl_cinfo,
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struct pnfs_layout_segment *lseg)
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{
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struct pnfs_commit_array *array, *tmp;
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list_for_each_entry_safe(array, tmp, &lseg->pls_commits, lseg_list)
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pnfs_remove_and_free_commit_array(array);
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}
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EXPORT_SYMBOL_GPL(pnfs_generic_ds_cinfo_release_lseg);
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void
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pnfs_generic_ds_cinfo_destroy(struct pnfs_ds_commit_info *fl_cinfo)
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{
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struct pnfs_commit_array *array, *tmp;
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list_for_each_entry_safe(array, tmp, &fl_cinfo->commits, cinfo_list)
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pnfs_remove_and_free_commit_array(array);
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}
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EXPORT_SYMBOL_GPL(pnfs_generic_ds_cinfo_destroy);
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/*
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* Locks the nfs_page requests for commit and moves them to
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* @bucket->committing.
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*/
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static int
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pnfs_bucket_scan_ds_commit_list(struct pnfs_commit_bucket *bucket,
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struct nfs_commit_info *cinfo,
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int max)
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{
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struct list_head *src = &bucket->written;
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struct list_head *dst = &bucket->committing;
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int ret;
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lockdep_assert_held(&NFS_I(cinfo->inode)->commit_mutex);
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ret = nfs_scan_commit_list(src, dst, cinfo, max);
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if (ret) {
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cinfo->ds->nwritten -= ret;
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cinfo->ds->ncommitting += ret;
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}
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return ret;
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}
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static int pnfs_bucket_scan_array(struct nfs_commit_info *cinfo,
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struct pnfs_commit_bucket *buckets,
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unsigned int nbuckets,
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int max)
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{
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unsigned int i;
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int rv = 0, cnt;
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for (i = 0; i < nbuckets && max != 0; i++) {
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cnt = pnfs_bucket_scan_ds_commit_list(&buckets[i], cinfo, max);
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rv += cnt;
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max -= cnt;
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}
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return rv;
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}
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/* Move reqs from written to committing lists, returning count
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* of number moved.
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*/
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int pnfs_generic_scan_commit_lists(struct nfs_commit_info *cinfo, int max)
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{
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struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds;
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struct pnfs_commit_array *array;
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int rv = 0, cnt;
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rcu_read_lock();
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list_for_each_entry_rcu(array, &fl_cinfo->commits, cinfo_list) {
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if (!array->lseg || !pnfs_get_commit_array(array))
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continue;
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rcu_read_unlock();
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cnt = pnfs_bucket_scan_array(cinfo, array->buckets,
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array->nbuckets, max);
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rcu_read_lock();
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pnfs_put_commit_array(array, cinfo->inode);
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rv += cnt;
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max -= cnt;
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if (!max)
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break;
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}
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rcu_read_unlock();
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return rv;
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}
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EXPORT_SYMBOL_GPL(pnfs_generic_scan_commit_lists);
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static unsigned int
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pnfs_bucket_recover_commit_reqs(struct list_head *dst,
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struct pnfs_commit_bucket *buckets,
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unsigned int nbuckets,
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struct nfs_commit_info *cinfo)
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{
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struct pnfs_commit_bucket *b;
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struct pnfs_layout_segment *freeme;
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unsigned int nwritten, ret = 0;
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unsigned int i;
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restart:
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for (i = 0, b = buckets; i < nbuckets; i++, b++) {
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nwritten = nfs_scan_commit_list(&b->written, dst, cinfo, 0);
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if (!nwritten)
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continue;
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ret += nwritten;
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freeme = pnfs_free_bucket_lseg(b);
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if (freeme) {
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pnfs_put_lseg(freeme);
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goto restart;
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}
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}
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return ret;
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}
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|
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/* Pull everything off the committing lists and dump into @dst. */
|
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void pnfs_generic_recover_commit_reqs(struct list_head *dst,
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struct nfs_commit_info *cinfo)
|
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{
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struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds;
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struct pnfs_commit_array *array;
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unsigned int nwritten;
|
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|
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lockdep_assert_held(&NFS_I(cinfo->inode)->commit_mutex);
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rcu_read_lock();
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list_for_each_entry_rcu(array, &fl_cinfo->commits, cinfo_list) {
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if (!array->lseg || !pnfs_get_commit_array(array))
|
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continue;
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|
rcu_read_unlock();
|
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nwritten = pnfs_bucket_recover_commit_reqs(dst,
|
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array->buckets,
|
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array->nbuckets,
|
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cinfo);
|
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rcu_read_lock();
|
|
pnfs_put_commit_array(array, cinfo->inode);
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|
fl_cinfo->nwritten -= nwritten;
|
|
}
|
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rcu_read_unlock();
|
|
}
|
|
EXPORT_SYMBOL_GPL(pnfs_generic_recover_commit_reqs);
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|
|
|
static struct nfs_page *
|
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pnfs_bucket_search_commit_reqs(struct pnfs_commit_bucket *buckets,
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|
unsigned int nbuckets, struct folio *folio)
|
|
{
|
|
struct nfs_page *req;
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struct pnfs_commit_bucket *b;
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|
unsigned int i;
|
|
|
|
/* Linearly search the commit lists for each bucket until a matching
|
|
* request is found */
|
|
for (i = 0, b = buckets; i < nbuckets; i++, b++) {
|
|
list_for_each_entry(req, &b->written, wb_list) {
|
|
if (nfs_page_to_folio(req) == folio)
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return req->wb_head;
|
|
}
|
|
list_for_each_entry(req, &b->committing, wb_list) {
|
|
if (nfs_page_to_folio(req) == folio)
|
|
return req->wb_head;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/* pnfs_generic_search_commit_reqs - Search lists in @cinfo for the head request
|
|
* for @folio
|
|
* @cinfo - commit info for current inode
|
|
* @folio - page to search for matching head request
|
|
*
|
|
* Return: the head request if one is found, otherwise %NULL.
|
|
*/
|
|
struct nfs_page *pnfs_generic_search_commit_reqs(struct nfs_commit_info *cinfo,
|
|
struct folio *folio)
|
|
{
|
|
struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds;
|
|
struct pnfs_commit_array *array;
|
|
struct nfs_page *req;
|
|
|
|
list_for_each_entry(array, &fl_cinfo->commits, cinfo_list) {
|
|
req = pnfs_bucket_search_commit_reqs(array->buckets,
|
|
array->nbuckets, folio);
|
|
if (req)
|
|
return req;
|
|
}
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pnfs_generic_search_commit_reqs);
|
|
|
|
static struct pnfs_layout_segment *
|
|
pnfs_bucket_get_committing(struct list_head *head,
|
|
struct pnfs_commit_bucket *bucket,
|
|
struct nfs_commit_info *cinfo)
|
|
{
|
|
struct pnfs_layout_segment *lseg;
|
|
struct list_head *pos;
|
|
|
|
list_for_each(pos, &bucket->committing)
|
|
cinfo->ds->ncommitting--;
|
|
list_splice_init(&bucket->committing, head);
|
|
lseg = pnfs_free_bucket_lseg(bucket);
|
|
if (!lseg)
|
|
lseg = pnfs_get_lseg(bucket->lseg);
|
|
return lseg;
|
|
}
|
|
|
|
static struct nfs_commit_data *
|
|
pnfs_bucket_fetch_commitdata(struct pnfs_commit_bucket *bucket,
|
|
struct nfs_commit_info *cinfo)
|
|
{
|
|
struct nfs_commit_data *data = nfs_commitdata_alloc();
|
|
|
|
if (!data)
|
|
return NULL;
|
|
data->lseg = pnfs_bucket_get_committing(&data->pages, bucket, cinfo);
|
|
return data;
|
|
}
|
|
|
|
static void pnfs_generic_retry_commit(struct pnfs_commit_bucket *buckets,
|
|
unsigned int nbuckets,
|
|
struct nfs_commit_info *cinfo,
|
|
unsigned int idx)
|
|
{
|
|
struct pnfs_commit_bucket *bucket;
|
|
struct pnfs_layout_segment *freeme;
|
|
LIST_HEAD(pages);
|
|
|
|
for (bucket = buckets; idx < nbuckets; bucket++, idx++) {
|
|
if (list_empty(&bucket->committing))
|
|
continue;
|
|
mutex_lock(&NFS_I(cinfo->inode)->commit_mutex);
|
|
freeme = pnfs_bucket_get_committing(&pages, bucket, cinfo);
|
|
mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex);
|
|
nfs_retry_commit(&pages, freeme, cinfo, idx);
|
|
pnfs_put_lseg(freeme);
|
|
}
|
|
}
|
|
|
|
static unsigned int
|
|
pnfs_bucket_alloc_ds_commits(struct list_head *list,
|
|
struct pnfs_commit_bucket *buckets,
|
|
unsigned int nbuckets,
|
|
struct nfs_commit_info *cinfo)
|
|
{
|
|
struct pnfs_commit_bucket *bucket;
|
|
struct nfs_commit_data *data;
|
|
unsigned int i;
|
|
unsigned int nreq = 0;
|
|
|
|
for (i = 0, bucket = buckets; i < nbuckets; i++, bucket++) {
|
|
if (list_empty(&bucket->committing))
|
|
continue;
|
|
mutex_lock(&NFS_I(cinfo->inode)->commit_mutex);
|
|
if (!list_empty(&bucket->committing)) {
|
|
data = pnfs_bucket_fetch_commitdata(bucket, cinfo);
|
|
if (!data)
|
|
goto out_error;
|
|
data->ds_commit_index = i;
|
|
list_add_tail(&data->list, list);
|
|
nreq++;
|
|
}
|
|
mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex);
|
|
}
|
|
return nreq;
|
|
out_error:
|
|
mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex);
|
|
/* Clean up on error */
|
|
pnfs_generic_retry_commit(buckets, nbuckets, cinfo, i);
|
|
return nreq;
|
|
}
|
|
|
|
static unsigned int
|
|
pnfs_alloc_ds_commits_list(struct list_head *list,
|
|
struct pnfs_ds_commit_info *fl_cinfo,
|
|
struct nfs_commit_info *cinfo)
|
|
{
|
|
struct pnfs_commit_array *array;
|
|
unsigned int ret = 0;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(array, &fl_cinfo->commits, cinfo_list) {
|
|
if (!array->lseg || !pnfs_get_commit_array(array))
|
|
continue;
|
|
rcu_read_unlock();
|
|
ret += pnfs_bucket_alloc_ds_commits(list, array->buckets,
|
|
array->nbuckets, cinfo);
|
|
rcu_read_lock();
|
|
pnfs_put_commit_array(array, cinfo->inode);
|
|
}
|
|
rcu_read_unlock();
|
|
return ret;
|
|
}
|
|
|
|
/* This follows nfs_commit_list pretty closely */
|
|
int
|
|
pnfs_generic_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
|
|
int how, struct nfs_commit_info *cinfo,
|
|
int (*initiate_commit)(struct nfs_commit_data *data,
|
|
int how))
|
|
{
|
|
struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds;
|
|
struct nfs_commit_data *data, *tmp;
|
|
LIST_HEAD(list);
|
|
unsigned int nreq = 0;
|
|
|
|
if (!list_empty(mds_pages)) {
|
|
data = nfs_commitdata_alloc();
|
|
if (!data) {
|
|
nfs_retry_commit(mds_pages, NULL, cinfo, -1);
|
|
return -ENOMEM;
|
|
}
|
|
data->ds_commit_index = -1;
|
|
list_splice_init(mds_pages, &data->pages);
|
|
list_add_tail(&data->list, &list);
|
|
nreq++;
|
|
}
|
|
|
|
nreq += pnfs_alloc_ds_commits_list(&list, fl_cinfo, cinfo);
|
|
if (nreq == 0)
|
|
goto out;
|
|
|
|
list_for_each_entry_safe(data, tmp, &list, list) {
|
|
list_del(&data->list);
|
|
if (data->ds_commit_index < 0) {
|
|
nfs_init_commit(data, NULL, NULL, cinfo);
|
|
nfs_initiate_commit(NFS_CLIENT(inode), data,
|
|
NFS_PROTO(data->inode),
|
|
data->mds_ops, how,
|
|
RPC_TASK_CRED_NOREF);
|
|
} else {
|
|
nfs_init_commit(data, NULL, data->lseg, cinfo);
|
|
initiate_commit(data, how);
|
|
}
|
|
}
|
|
out:
|
|
return PNFS_ATTEMPTED;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pnfs_generic_commit_pagelist);
|
|
|
|
/*
|
|
* Data server cache
|
|
*
|
|
* Data servers can be mapped to different device ids.
|
|
* nfs4_pnfs_ds reference counting
|
|
* - set to 1 on allocation
|
|
* - incremented when a device id maps a data server already in the cache.
|
|
* - decremented when deviceid is removed from the cache.
|
|
*/
|
|
static DEFINE_SPINLOCK(nfs4_ds_cache_lock);
|
|
static LIST_HEAD(nfs4_data_server_cache);
|
|
|
|
/* Debug routines */
|
|
static void
|
|
print_ds(struct nfs4_pnfs_ds *ds)
|
|
{
|
|
if (ds == NULL) {
|
|
printk(KERN_WARNING "%s NULL device\n", __func__);
|
|
return;
|
|
}
|
|
printk(KERN_WARNING " ds %s\n"
|
|
" ref count %d\n"
|
|
" client %p\n"
|
|
" cl_exchange_flags %x\n",
|
|
ds->ds_remotestr,
|
|
refcount_read(&ds->ds_count), ds->ds_clp,
|
|
ds->ds_clp ? ds->ds_clp->cl_exchange_flags : 0);
|
|
}
|
|
|
|
static bool
|
|
same_sockaddr(struct sockaddr *addr1, struct sockaddr *addr2)
|
|
{
|
|
struct sockaddr_in *a, *b;
|
|
struct sockaddr_in6 *a6, *b6;
|
|
|
|
if (addr1->sa_family != addr2->sa_family)
|
|
return false;
|
|
|
|
switch (addr1->sa_family) {
|
|
case AF_INET:
|
|
a = (struct sockaddr_in *)addr1;
|
|
b = (struct sockaddr_in *)addr2;
|
|
|
|
if (a->sin_addr.s_addr == b->sin_addr.s_addr &&
|
|
a->sin_port == b->sin_port)
|
|
return true;
|
|
break;
|
|
|
|
case AF_INET6:
|
|
a6 = (struct sockaddr_in6 *)addr1;
|
|
b6 = (struct sockaddr_in6 *)addr2;
|
|
|
|
/* LINKLOCAL addresses must have matching scope_id */
|
|
if (ipv6_addr_src_scope(&a6->sin6_addr) ==
|
|
IPV6_ADDR_SCOPE_LINKLOCAL &&
|
|
a6->sin6_scope_id != b6->sin6_scope_id)
|
|
return false;
|
|
|
|
if (ipv6_addr_equal(&a6->sin6_addr, &b6->sin6_addr) &&
|
|
a6->sin6_port == b6->sin6_port)
|
|
return true;
|
|
break;
|
|
|
|
default:
|
|
dprintk("%s: unhandled address family: %u\n",
|
|
__func__, addr1->sa_family);
|
|
return false;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* Checks if 'dsaddrs1' contains a subset of 'dsaddrs2'. If it does,
|
|
* declare a match.
|
|
*/
|
|
static bool
|
|
_same_data_server_addrs_locked(const struct list_head *dsaddrs1,
|
|
const struct list_head *dsaddrs2)
|
|
{
|
|
struct nfs4_pnfs_ds_addr *da1, *da2;
|
|
struct sockaddr *sa1, *sa2;
|
|
bool match = false;
|
|
|
|
list_for_each_entry(da1, dsaddrs1, da_node) {
|
|
sa1 = (struct sockaddr *)&da1->da_addr;
|
|
match = false;
|
|
list_for_each_entry(da2, dsaddrs2, da_node) {
|
|
sa2 = (struct sockaddr *)&da2->da_addr;
|
|
match = same_sockaddr(sa1, sa2);
|
|
if (match)
|
|
break;
|
|
}
|
|
if (!match)
|
|
break;
|
|
}
|
|
return match;
|
|
}
|
|
|
|
/*
|
|
* Lookup DS by addresses. nfs4_ds_cache_lock is held
|
|
*/
|
|
static struct nfs4_pnfs_ds *
|
|
_data_server_lookup_locked(const struct list_head *dsaddrs)
|
|
{
|
|
struct nfs4_pnfs_ds *ds;
|
|
|
|
list_for_each_entry(ds, &nfs4_data_server_cache, ds_node)
|
|
if (_same_data_server_addrs_locked(&ds->ds_addrs, dsaddrs))
|
|
return ds;
|
|
return NULL;
|
|
}
|
|
|
|
static struct nfs4_pnfs_ds_addr *nfs4_pnfs_ds_addr_alloc(gfp_t gfp_flags)
|
|
{
|
|
struct nfs4_pnfs_ds_addr *da = kzalloc(sizeof(*da), gfp_flags);
|
|
if (da)
|
|
INIT_LIST_HEAD(&da->da_node);
|
|
return da;
|
|
}
|
|
|
|
static void nfs4_pnfs_ds_addr_free(struct nfs4_pnfs_ds_addr *da)
|
|
{
|
|
kfree(da->da_remotestr);
|
|
kfree(da->da_netid);
|
|
kfree(da);
|
|
}
|
|
|
|
static void destroy_ds(struct nfs4_pnfs_ds *ds)
|
|
{
|
|
struct nfs4_pnfs_ds_addr *da;
|
|
|
|
dprintk("--> %s\n", __func__);
|
|
ifdebug(FACILITY)
|
|
print_ds(ds);
|
|
|
|
nfs_put_client(ds->ds_clp);
|
|
|
|
while (!list_empty(&ds->ds_addrs)) {
|
|
da = list_first_entry(&ds->ds_addrs,
|
|
struct nfs4_pnfs_ds_addr,
|
|
da_node);
|
|
list_del_init(&da->da_node);
|
|
nfs4_pnfs_ds_addr_free(da);
|
|
}
|
|
|
|
kfree(ds->ds_remotestr);
|
|
kfree(ds);
|
|
}
|
|
|
|
void nfs4_pnfs_ds_put(struct nfs4_pnfs_ds *ds)
|
|
{
|
|
if (refcount_dec_and_lock(&ds->ds_count,
|
|
&nfs4_ds_cache_lock)) {
|
|
list_del_init(&ds->ds_node);
|
|
spin_unlock(&nfs4_ds_cache_lock);
|
|
destroy_ds(ds);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_put);
|
|
|
|
/*
|
|
* Create a string with a human readable address and port to avoid
|
|
* complicated setup around many dprinks.
|
|
*/
|
|
static char *
|
|
nfs4_pnfs_remotestr(struct list_head *dsaddrs, gfp_t gfp_flags)
|
|
{
|
|
struct nfs4_pnfs_ds_addr *da;
|
|
char *remotestr;
|
|
size_t len;
|
|
char *p;
|
|
|
|
len = 3; /* '{', '}' and eol */
|
|
list_for_each_entry(da, dsaddrs, da_node) {
|
|
len += strlen(da->da_remotestr) + 1; /* string plus comma */
|
|
}
|
|
|
|
remotestr = kzalloc(len, gfp_flags);
|
|
if (!remotestr)
|
|
return NULL;
|
|
|
|
p = remotestr;
|
|
*(p++) = '{';
|
|
len--;
|
|
list_for_each_entry(da, dsaddrs, da_node) {
|
|
size_t ll = strlen(da->da_remotestr);
|
|
|
|
if (ll > len)
|
|
goto out_err;
|
|
|
|
memcpy(p, da->da_remotestr, ll);
|
|
p += ll;
|
|
len -= ll;
|
|
|
|
if (len < 1)
|
|
goto out_err;
|
|
(*p++) = ',';
|
|
len--;
|
|
}
|
|
if (len < 2)
|
|
goto out_err;
|
|
*(p++) = '}';
|
|
*p = '\0';
|
|
return remotestr;
|
|
out_err:
|
|
kfree(remotestr);
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Given a list of multipath struct nfs4_pnfs_ds_addr, add it to ds cache if
|
|
* uncached and return cached struct nfs4_pnfs_ds.
|
|
*/
|
|
struct nfs4_pnfs_ds *
|
|
nfs4_pnfs_ds_add(struct list_head *dsaddrs, gfp_t gfp_flags)
|
|
{
|
|
struct nfs4_pnfs_ds *tmp_ds, *ds = NULL;
|
|
char *remotestr;
|
|
|
|
if (list_empty(dsaddrs)) {
|
|
dprintk("%s: no addresses defined\n", __func__);
|
|
goto out;
|
|
}
|
|
|
|
ds = kzalloc(sizeof(*ds), gfp_flags);
|
|
if (!ds)
|
|
goto out;
|
|
|
|
/* this is only used for debugging, so it's ok if its NULL */
|
|
remotestr = nfs4_pnfs_remotestr(dsaddrs, gfp_flags);
|
|
|
|
spin_lock(&nfs4_ds_cache_lock);
|
|
tmp_ds = _data_server_lookup_locked(dsaddrs);
|
|
if (tmp_ds == NULL) {
|
|
INIT_LIST_HEAD(&ds->ds_addrs);
|
|
list_splice_init(dsaddrs, &ds->ds_addrs);
|
|
ds->ds_remotestr = remotestr;
|
|
refcount_set(&ds->ds_count, 1);
|
|
INIT_LIST_HEAD(&ds->ds_node);
|
|
ds->ds_clp = NULL;
|
|
list_add(&ds->ds_node, &nfs4_data_server_cache);
|
|
dprintk("%s add new data server %s\n", __func__,
|
|
ds->ds_remotestr);
|
|
} else {
|
|
kfree(remotestr);
|
|
kfree(ds);
|
|
refcount_inc(&tmp_ds->ds_count);
|
|
dprintk("%s data server %s found, inc'ed ds_count to %d\n",
|
|
__func__, tmp_ds->ds_remotestr,
|
|
refcount_read(&tmp_ds->ds_count));
|
|
ds = tmp_ds;
|
|
}
|
|
spin_unlock(&nfs4_ds_cache_lock);
|
|
out:
|
|
return ds;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_add);
|
|
|
|
static int nfs4_wait_ds_connect(struct nfs4_pnfs_ds *ds)
|
|
{
|
|
might_sleep();
|
|
return wait_on_bit(&ds->ds_state, NFS4DS_CONNECTING, TASK_KILLABLE);
|
|
}
|
|
|
|
static void nfs4_clear_ds_conn_bit(struct nfs4_pnfs_ds *ds)
|
|
{
|
|
smp_mb__before_atomic();
|
|
clear_and_wake_up_bit(NFS4DS_CONNECTING, &ds->ds_state);
|
|
}
|
|
|
|
static struct nfs_client *(*get_v3_ds_connect)(
|
|
struct nfs_server *mds_srv,
|
|
const struct sockaddr_storage *ds_addr,
|
|
int ds_addrlen,
|
|
int ds_proto,
|
|
unsigned int ds_timeo,
|
|
unsigned int ds_retrans);
|
|
|
|
static bool load_v3_ds_connect(void)
|
|
{
|
|
if (!get_v3_ds_connect) {
|
|
get_v3_ds_connect = symbol_request(nfs3_set_ds_client);
|
|
WARN_ON_ONCE(!get_v3_ds_connect);
|
|
}
|
|
|
|
return(get_v3_ds_connect != NULL);
|
|
}
|
|
|
|
void nfs4_pnfs_v3_ds_connect_unload(void)
|
|
{
|
|
if (get_v3_ds_connect) {
|
|
symbol_put(nfs3_set_ds_client);
|
|
get_v3_ds_connect = NULL;
|
|
}
|
|
}
|
|
|
|
static int _nfs4_pnfs_v3_ds_connect(struct nfs_server *mds_srv,
|
|
struct nfs4_pnfs_ds *ds,
|
|
unsigned int timeo,
|
|
unsigned int retrans)
|
|
{
|
|
struct nfs_client *clp = ERR_PTR(-EIO);
|
|
struct nfs4_pnfs_ds_addr *da;
|
|
unsigned long connect_timeout = timeo * (retrans + 1) * HZ / 10;
|
|
int status = 0;
|
|
|
|
dprintk("--> %s DS %s\n", __func__, ds->ds_remotestr);
|
|
|
|
if (!load_v3_ds_connect())
|
|
return -EPROTONOSUPPORT;
|
|
|
|
list_for_each_entry(da, &ds->ds_addrs, da_node) {
|
|
dprintk("%s: DS %s: trying address %s\n",
|
|
__func__, ds->ds_remotestr, da->da_remotestr);
|
|
|
|
if (!IS_ERR(clp)) {
|
|
struct xprt_create xprt_args = {
|
|
.ident = da->da_transport,
|
|
.net = clp->cl_net,
|
|
.dstaddr = (struct sockaddr *)&da->da_addr,
|
|
.addrlen = da->da_addrlen,
|
|
.servername = clp->cl_hostname,
|
|
.connect_timeout = connect_timeout,
|
|
.reconnect_timeout = connect_timeout,
|
|
};
|
|
|
|
if (da->da_transport != clp->cl_proto)
|
|
continue;
|
|
if (da->da_addr.ss_family != clp->cl_addr.ss_family)
|
|
continue;
|
|
/* Add this address as an alias */
|
|
rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args,
|
|
rpc_clnt_test_and_add_xprt, NULL);
|
|
continue;
|
|
}
|
|
clp = get_v3_ds_connect(mds_srv,
|
|
&da->da_addr,
|
|
da->da_addrlen, da->da_transport,
|
|
timeo, retrans);
|
|
if (IS_ERR(clp))
|
|
continue;
|
|
clp->cl_rpcclient->cl_softerr = 0;
|
|
clp->cl_rpcclient->cl_softrtry = 0;
|
|
}
|
|
|
|
if (IS_ERR(clp)) {
|
|
status = PTR_ERR(clp);
|
|
goto out;
|
|
}
|
|
|
|
smp_wmb();
|
|
WRITE_ONCE(ds->ds_clp, clp);
|
|
dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr);
|
|
out:
|
|
return status;
|
|
}
|
|
|
|
static int _nfs4_pnfs_v4_ds_connect(struct nfs_server *mds_srv,
|
|
struct nfs4_pnfs_ds *ds,
|
|
unsigned int timeo,
|
|
unsigned int retrans,
|
|
u32 minor_version)
|
|
{
|
|
struct nfs_client *clp = ERR_PTR(-EIO);
|
|
struct nfs4_pnfs_ds_addr *da;
|
|
int status = 0;
|
|
|
|
dprintk("--> %s DS %s\n", __func__, ds->ds_remotestr);
|
|
|
|
list_for_each_entry(da, &ds->ds_addrs, da_node) {
|
|
dprintk("%s: DS %s: trying address %s\n",
|
|
__func__, ds->ds_remotestr, da->da_remotestr);
|
|
|
|
if (!IS_ERR(clp) && clp->cl_mvops->session_trunk) {
|
|
struct xprt_create xprt_args = {
|
|
.ident = da->da_transport,
|
|
.net = clp->cl_net,
|
|
.dstaddr = (struct sockaddr *)&da->da_addr,
|
|
.addrlen = da->da_addrlen,
|
|
.servername = clp->cl_hostname,
|
|
};
|
|
struct nfs4_add_xprt_data xprtdata = {
|
|
.clp = clp,
|
|
};
|
|
struct rpc_add_xprt_test rpcdata = {
|
|
.add_xprt_test = clp->cl_mvops->session_trunk,
|
|
.data = &xprtdata,
|
|
};
|
|
|
|
if (da->da_transport != clp->cl_proto)
|
|
continue;
|
|
if (da->da_addr.ss_family != clp->cl_addr.ss_family)
|
|
continue;
|
|
/**
|
|
* Test this address for session trunking and
|
|
* add as an alias
|
|
*/
|
|
xprtdata.cred = nfs4_get_clid_cred(clp);
|
|
rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args,
|
|
rpc_clnt_setup_test_and_add_xprt,
|
|
&rpcdata);
|
|
if (xprtdata.cred)
|
|
put_cred(xprtdata.cred);
|
|
} else {
|
|
clp = nfs4_set_ds_client(mds_srv,
|
|
&da->da_addr,
|
|
da->da_addrlen,
|
|
da->da_transport, timeo,
|
|
retrans, minor_version);
|
|
if (IS_ERR(clp))
|
|
continue;
|
|
|
|
status = nfs4_init_ds_session(clp,
|
|
mds_srv->nfs_client->cl_lease_time);
|
|
if (status) {
|
|
nfs_put_client(clp);
|
|
clp = ERR_PTR(-EIO);
|
|
continue;
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
if (IS_ERR(clp)) {
|
|
status = PTR_ERR(clp);
|
|
goto out;
|
|
}
|
|
|
|
smp_wmb();
|
|
WRITE_ONCE(ds->ds_clp, clp);
|
|
dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr);
|
|
out:
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* Create an rpc connection to the nfs4_pnfs_ds data server.
|
|
* Currently only supports IPv4 and IPv6 addresses.
|
|
* If connection fails, make devid unavailable and return a -errno.
|
|
*/
|
|
int nfs4_pnfs_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds,
|
|
struct nfs4_deviceid_node *devid, unsigned int timeo,
|
|
unsigned int retrans, u32 version, u32 minor_version)
|
|
{
|
|
int err;
|
|
|
|
do {
|
|
err = nfs4_wait_ds_connect(ds);
|
|
if (err || ds->ds_clp)
|
|
goto out;
|
|
if (nfs4_test_deviceid_unavailable(devid))
|
|
return -ENODEV;
|
|
} while (test_and_set_bit(NFS4DS_CONNECTING, &ds->ds_state) != 0);
|
|
|
|
if (ds->ds_clp)
|
|
goto connect_done;
|
|
|
|
switch (version) {
|
|
case 3:
|
|
err = _nfs4_pnfs_v3_ds_connect(mds_srv, ds, timeo, retrans);
|
|
break;
|
|
case 4:
|
|
err = _nfs4_pnfs_v4_ds_connect(mds_srv, ds, timeo, retrans,
|
|
minor_version);
|
|
break;
|
|
default:
|
|
dprintk("%s: unsupported DS version %d\n", __func__, version);
|
|
err = -EPROTONOSUPPORT;
|
|
}
|
|
|
|
connect_done:
|
|
nfs4_clear_ds_conn_bit(ds);
|
|
out:
|
|
/*
|
|
* At this point the ds->ds_clp should be ready, but it might have
|
|
* hit an error.
|
|
*/
|
|
if (!err) {
|
|
if (!ds->ds_clp || !nfs_client_init_is_complete(ds->ds_clp)) {
|
|
WARN_ON_ONCE(ds->ds_clp ||
|
|
!nfs4_test_deviceid_unavailable(devid));
|
|
return -EINVAL;
|
|
}
|
|
err = nfs_client_init_status(ds->ds_clp);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_connect);
|
|
|
|
/*
|
|
* Currently only supports ipv4, ipv6 and one multi-path address.
|
|
*/
|
|
struct nfs4_pnfs_ds_addr *
|
|
nfs4_decode_mp_ds_addr(struct net *net, struct xdr_stream *xdr, gfp_t gfp_flags)
|
|
{
|
|
struct nfs4_pnfs_ds_addr *da = NULL;
|
|
char *buf, *portstr;
|
|
__be16 port;
|
|
ssize_t nlen, rlen;
|
|
int tmp[2];
|
|
char *netid;
|
|
size_t len;
|
|
char *startsep = "";
|
|
char *endsep = "";
|
|
|
|
|
|
/* r_netid */
|
|
nlen = xdr_stream_decode_string_dup(xdr, &netid, XDR_MAX_NETOBJ,
|
|
gfp_flags);
|
|
if (unlikely(nlen < 0))
|
|
goto out_err;
|
|
|
|
/* r_addr: ip/ip6addr with port in dec octets - see RFC 5665 */
|
|
/* port is ".ABC.DEF", 8 chars max */
|
|
rlen = xdr_stream_decode_string_dup(xdr, &buf, INET6_ADDRSTRLEN +
|
|
IPV6_SCOPE_ID_LEN + 8, gfp_flags);
|
|
if (unlikely(rlen < 0))
|
|
goto out_free_netid;
|
|
|
|
/* replace port '.' with '-' */
|
|
portstr = strrchr(buf, '.');
|
|
if (!portstr) {
|
|
dprintk("%s: Failed finding expected dot in port\n",
|
|
__func__);
|
|
goto out_free_buf;
|
|
}
|
|
*portstr = '-';
|
|
|
|
/* find '.' between address and port */
|
|
portstr = strrchr(buf, '.');
|
|
if (!portstr) {
|
|
dprintk("%s: Failed finding expected dot between address and "
|
|
"port\n", __func__);
|
|
goto out_free_buf;
|
|
}
|
|
*portstr = '\0';
|
|
|
|
da = nfs4_pnfs_ds_addr_alloc(gfp_flags);
|
|
if (unlikely(!da))
|
|
goto out_free_buf;
|
|
|
|
if (!rpc_pton(net, buf, portstr-buf, (struct sockaddr *)&da->da_addr,
|
|
sizeof(da->da_addr))) {
|
|
dprintk("%s: error parsing address %s\n", __func__, buf);
|
|
goto out_free_da;
|
|
}
|
|
|
|
portstr++;
|
|
sscanf(portstr, "%d-%d", &tmp[0], &tmp[1]);
|
|
port = htons((tmp[0] << 8) | (tmp[1]));
|
|
|
|
switch (da->da_addr.ss_family) {
|
|
case AF_INET:
|
|
((struct sockaddr_in *)&da->da_addr)->sin_port = port;
|
|
da->da_addrlen = sizeof(struct sockaddr_in);
|
|
break;
|
|
|
|
case AF_INET6:
|
|
((struct sockaddr_in6 *)&da->da_addr)->sin6_port = port;
|
|
da->da_addrlen = sizeof(struct sockaddr_in6);
|
|
startsep = "[";
|
|
endsep = "]";
|
|
break;
|
|
|
|
default:
|
|
dprintk("%s: unsupported address family: %u\n",
|
|
__func__, da->da_addr.ss_family);
|
|
goto out_free_da;
|
|
}
|
|
|
|
da->da_transport = xprt_find_transport_ident(netid);
|
|
if (da->da_transport < 0) {
|
|
dprintk("%s: ERROR: unknown r_netid \"%s\"\n",
|
|
__func__, netid);
|
|
goto out_free_da;
|
|
}
|
|
|
|
da->da_netid = netid;
|
|
|
|
/* save human readable address */
|
|
len = strlen(startsep) + strlen(buf) + strlen(endsep) + 7;
|
|
da->da_remotestr = kzalloc(len, gfp_flags);
|
|
|
|
/* NULL is ok, only used for dprintk */
|
|
if (da->da_remotestr)
|
|
snprintf(da->da_remotestr, len, "%s%s%s:%u", startsep,
|
|
buf, endsep, ntohs(port));
|
|
|
|
dprintk("%s: Parsed DS addr %s\n", __func__, da->da_remotestr);
|
|
kfree(buf);
|
|
return da;
|
|
|
|
out_free_da:
|
|
kfree(da);
|
|
out_free_buf:
|
|
dprintk("%s: Error parsing DS addr: %s\n", __func__, buf);
|
|
kfree(buf);
|
|
out_free_netid:
|
|
kfree(netid);
|
|
out_err:
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(nfs4_decode_mp_ds_addr);
|
|
|
|
void
|
|
pnfs_layout_mark_request_commit(struct nfs_page *req,
|
|
struct pnfs_layout_segment *lseg,
|
|
struct nfs_commit_info *cinfo,
|
|
u32 ds_commit_idx)
|
|
{
|
|
struct list_head *list;
|
|
struct pnfs_commit_array *array;
|
|
struct pnfs_commit_bucket *bucket;
|
|
|
|
mutex_lock(&NFS_I(cinfo->inode)->commit_mutex);
|
|
array = pnfs_lookup_commit_array(cinfo->ds, lseg);
|
|
if (!array || !pnfs_is_valid_lseg(lseg))
|
|
goto out_resched;
|
|
bucket = &array->buckets[ds_commit_idx];
|
|
list = &bucket->written;
|
|
/* Non-empty buckets hold a reference on the lseg. That ref
|
|
* is normally transferred to the COMMIT call and released
|
|
* there. It could also be released if the last req is pulled
|
|
* off due to a rewrite, in which case it will be done in
|
|
* pnfs_common_clear_request_commit
|
|
*/
|
|
if (!bucket->lseg)
|
|
bucket->lseg = pnfs_get_lseg(lseg);
|
|
set_bit(PG_COMMIT_TO_DS, &req->wb_flags);
|
|
cinfo->ds->nwritten++;
|
|
|
|
nfs_request_add_commit_list_locked(req, list, cinfo);
|
|
mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex);
|
|
nfs_folio_mark_unstable(nfs_page_to_folio(req), cinfo);
|
|
return;
|
|
out_resched:
|
|
mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex);
|
|
cinfo->completion_ops->resched_write(cinfo, req);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pnfs_layout_mark_request_commit);
|
|
|
|
int
|
|
pnfs_nfs_generic_sync(struct inode *inode, bool datasync)
|
|
{
|
|
int ret;
|
|
|
|
if (!pnfs_layoutcommit_outstanding(inode))
|
|
return 0;
|
|
ret = nfs_commit_inode(inode, FLUSH_SYNC);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (datasync)
|
|
return 0;
|
|
return pnfs_layoutcommit_inode(inode, true);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pnfs_nfs_generic_sync);
|
|
|