From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx141.netapp.com ([216.240.21.12]:20664 "EHLO mx141.netapp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752730AbeBTQv7 (ORCPT ); Tue, 20 Feb 2018 11:51:59 -0500 From: Olga Kornievskaia To: CC: Subject: [PATCH v7 05/10] NFSD introduce asynch copy feature Date: Tue, 20 Feb 2018 11:42:24 -0500 Message-ID: <20180220164229.65404-6-kolga@netapp.com> In-Reply-To: <20180220164229.65404-1-kolga@netapp.com> References: <20180220164229.65404-1-kolga@netapp.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-nfs-owner@vger.kernel.org List-ID: Upon receiving a request for async copy, create a new kthread. If we get asynchronous request, make sure to copy the needed arguments/state from the stack before starting the copy. Then start the thread and reply back to the client indicating copy is asynchronous. nfsd_copy_file_range() will copy in a loop over the total number of bytes is needed to copy. In case a failure happens in the middle, we ignore the error and return how much we copied so far. Once done creating a workitem for the callback workqueue and send CB_OFFLOAD with the results. In the following patches the unique stateid will be generated for the async COPY to return, at that point will enable the async feature. Signed-off-by: Olga Kornievskaia --- fs/nfsd/nfs4proc.c | 176 ++++++++++++++++++++++++++++++++++++++++++++++------ fs/nfsd/nfs4state.c | 2 + fs/nfsd/state.h | 2 + fs/nfsd/xdr4.h | 9 +++ 4 files changed, 170 insertions(+), 19 deletions(-) diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c index e11494f..91d1544 100644 --- a/fs/nfsd/nfs4proc.c +++ b/fs/nfsd/nfs4proc.c @@ -35,6 +35,7 @@ #include #include #include +#include #include "idmap.h" #include "cache.h" @@ -1083,39 +1084,176 @@ static int fill_in_write_vector(struct kvec *vec, struct nfsd4_write *write) out: return status; } +static void nfsd4_cb_offload_release(struct nfsd4_callback *cb) +{ + struct nfsd4_copy *copy = container_of(cb, struct nfsd4_copy, cp_cb); + + atomic_dec(©->cp_clp->cl_refcount); + kfree(copy); +} + +static int nfsd4_cb_offload_done(struct nfsd4_callback *cb, + struct rpc_task *task) +{ + return 1; +} + +static const struct nfsd4_callback_ops nfsd4_cb_offload_ops = { + .release = nfsd4_cb_offload_release, + .done = nfsd4_cb_offload_done +}; + +static int nfsd4_init_copy_res(struct nfsd4_copy *copy, bool sync) +{ + memcpy(©->cp_res.cb_stateid, ©->cp_dst_stateid, + sizeof(copy->cp_dst_stateid)); + copy->cp_res.wr_stable_how = NFS_UNSTABLE; + copy->cp_consecutive = 1; + copy->cp_synchronous = sync; + gen_boot_verifier(©->cp_res.wr_verifier, copy->net); + + return nfs_ok; +} + +static int _nfsd_copy_file_range(struct nfsd4_copy *copy) +{ + ssize_t bytes_copied = 0; + size_t bytes_total = copy->cp_count; + u64 src_pos = copy->cp_src_pos; + u64 dst_pos = copy->cp_dst_pos; + + do { + bytes_copied = nfsd_copy_file_range(copy->fh_src, src_pos, + copy->fh_dst, dst_pos, bytes_total); + if (bytes_copied <= 0) + break; + bytes_total -= bytes_copied; + copy->cp_res.wr_bytes_written += bytes_copied; + src_pos += bytes_copied; + dst_pos += bytes_copied; + } while (bytes_total > 0 && !copy->cp_synchronous); + return bytes_copied; +} + +static int nfsd4_do_copy(struct nfsd4_copy *copy, bool sync) +{ + __be32 status; + ssize_t bytes; + + bytes = _nfsd_copy_file_range(copy); + if (bytes < 0 && !copy->cp_res.wr_bytes_written) + status = nfserrno(bytes); + else + status = nfsd4_init_copy_res(copy, sync); + + fput(copy->fh_src); + fput(copy->fh_dst); + return status; +} + +static void dup_copy_fields(struct nfsd4_copy *src, struct nfsd4_copy *dst) +{ + memcpy(&dst->cp_src_stateid, &src->cp_src_stateid, sizeof(stateid_t)); + memcpy(&dst->cp_dst_stateid, &src->cp_dst_stateid, sizeof(stateid_t)); + dst->cp_src_pos = src->cp_src_pos; + dst->cp_dst_pos = src->cp_dst_pos; + dst->cp_count = src->cp_count; + dst->cp_consecutive = src->cp_consecutive; + dst->cp_synchronous = src->cp_synchronous; + memcpy(&dst->cp_res, &src->cp_res, sizeof(src->cp_res)); + /* skipping nfsd4_callback */ + memcpy(&dst->fh, &src->fh, sizeof(src->fh)); + dst->net = src->net; + dst->cp_clp = src->cp_clp; + atomic_inc(&dst->cp_clp->cl_refcount); + dst->fh_dst = get_file(src->fh_dst); + dst->fh_src = get_file(src->fh_src); +} + +static void cleanup_async_copy(struct nfsd4_copy *copy, bool remove) +{ + fput(copy->fh_dst); + fput(copy->fh_src); + if (remove) { + spin_lock(©->cp_clp->async_lock); + list_del(©->copies); + spin_unlock(©->cp_clp->async_lock); + } + atomic_dec(©->cp_clp->cl_refcount); + kfree(copy); +} + +static int nfsd4_do_async_copy(void *data) +{ + struct nfsd4_copy *copy = (struct nfsd4_copy *)data; + struct nfsd4_copy *cb_copy; + + copy->nfserr = nfsd4_do_copy(copy, 0); + cb_copy = kzalloc(sizeof(struct nfsd4_copy), GFP_KERNEL); + if (!cb_copy) + goto out; + memcpy(&cb_copy->cp_res, ©->cp_res, sizeof(copy->cp_res)); + cb_copy->cp_clp = copy->cp_clp; + atomic_inc(&cb_copy->cp_clp->cl_refcount); + cb_copy->nfserr = copy->nfserr; + memcpy(&cb_copy->fh, ©->fh, sizeof(copy->fh)); + nfsd4_init_cb(&cb_copy->cp_cb, cb_copy->cp_clp, + &nfsd4_cb_offload_ops, NFSPROC4_CLNT_CB_OFFLOAD); + nfsd4_run_cb(&cb_copy->cp_cb); +out: + cleanup_async_copy(copy, true); + return 0; +} static __be32 nfsd4_copy(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, union nfsd4_op_u *u) { struct nfsd4_copy *copy = &u->copy; - struct file *src, *dst; __be32 status; - ssize_t bytes; + struct nfsd4_copy *async_copy = NULL; - status = nfsd4_verify_copy(rqstp, cstate, ©->cp_src_stateid, &src, - ©->cp_dst_stateid, &dst); + status = nfsd4_verify_copy(rqstp, cstate, ©->cp_src_stateid, + ©->fh_src, ©->cp_dst_stateid, + ©->fh_dst); if (status) goto out; - bytes = nfsd_copy_file_range(src, copy->cp_src_pos, - dst, copy->cp_dst_pos, copy->cp_count); - - if (bytes < 0) - status = nfserrno(bytes); - else { - copy->cp_res.wr_bytes_written = bytes; - copy->cp_res.wr_stable_how = NFS_UNSTABLE; - copy->cp_consecutive = 1; - copy->cp_synchronous = 1; - gen_boot_verifier(©->cp_res.wr_verifier, SVC_NET(rqstp)); - status = nfs_ok; + copy->cp_clp = cstate->clp; + memcpy(©->fh, &cstate->current_fh.fh_handle, + sizeof(struct knfsd_fh)); + copy->net = SVC_NET(rqstp); + /* for now disable asynchronous copy feature */ + copy->cp_synchronous = 1; + if (!copy->cp_synchronous) { + status = nfsd4_init_copy_res(copy, 0); + async_copy = kzalloc(sizeof(struct nfsd4_copy), GFP_KERNEL); + if (!async_copy) { + status = nfserrno(-ENOMEM); + goto out; + } + dup_copy_fields(copy, async_copy); + memcpy(©->cp_res.cb_stateid, ©->cp_dst_stateid, + sizeof(copy->cp_dst_stateid)); + async_copy->copy_task = kthread_create(nfsd4_do_async_copy, + async_copy, "%s", "copy thread"); + if (IS_ERR(async_copy->copy_task)) { + status = PTR_ERR(async_copy->copy_task); + goto out_err; + } + spin_lock(&async_copy->cp_clp->async_lock); + list_add(&async_copy->copies, + &async_copy->cp_clp->async_copies); + spin_unlock(&async_copy->cp_clp->async_lock); + wake_up_process(async_copy->copy_task); + } else { + status = nfsd4_do_copy(copy, 1); } - - fput(src); - fput(dst); out: return status; +out_err: + cleanup_async_copy(async_copy, false); + goto out; } static __be32 diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c index 150521c..fe665b0 100644 --- a/fs/nfsd/nfs4state.c +++ b/fs/nfsd/nfs4state.c @@ -1790,6 +1790,8 @@ static struct nfs4_client *alloc_client(struct xdr_netobj name) #ifdef CONFIG_NFSD_PNFS INIT_LIST_HEAD(&clp->cl_lo_states); #endif + INIT_LIST_HEAD(&clp->async_copies); + spin_lock_init(&clp->async_lock); spin_lock_init(&clp->cl_lock); rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table"); return clp; diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h index 5c16d35..491030e 100644 --- a/fs/nfsd/state.h +++ b/fs/nfsd/state.h @@ -355,6 +355,8 @@ struct nfs4_client { struct rpc_wait_queue cl_cb_waitq; /* backchannel callers may */ /* wait here for slots */ struct net *net; + struct list_head async_copies; /* list of async copies */ + spinlock_t async_lock; /* lock for async copies */ }; /* struct nfs4_client_reset diff --git a/fs/nfsd/xdr4.h b/fs/nfsd/xdr4.h index 4fc0e35..3b6b655 100644 --- a/fs/nfsd/xdr4.h +++ b/fs/nfsd/xdr4.h @@ -529,6 +529,15 @@ struct nfsd4_copy { struct nfsd4_callback cp_cb; __be32 nfserr; struct knfsd_fh fh; + + struct nfs4_client *cp_clp; + + struct file *fh_src; + struct file *fh_dst; + struct net *net; + + struct list_head copies; + struct task_struct *copy_task; }; struct nfsd4_seek { -- 1.8.3.1