From 3a4a38e66d2443ab3c27a689c62a6937b854010e Mon Sep 17 00:00:00 2001 From: David Howells Date: Thu, 17 Feb 2022 13:30:38 +0000 Subject: netfs: Split netfs_io_* object handling out Split netfs_io_* object handling out into a file that's going to contain object allocation, get and put routines. Signed-off-by: David Howells Reviewed-by: Jeff Layton cc: linux-cachefs@redhat.com Link: https://lore.kernel.org/r/164622995118.3564931.6089530629052064470.stgit@warthog.procyon.org.uk/ # v1 Link: https://lore.kernel.org/r/164678197044.1200972.11511937252083343775.stgit@warthog.procyon.org.uk/ # v2 Link: https://lore.kernel.org/r/164692894693.2099075.7831091294248735173.stgit@warthog.procyon.org.uk/ # v3 --- fs/netfs/objects.c | 123 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 123 insertions(+) create mode 100644 fs/netfs/objects.c (limited to 'fs/netfs/objects.c') diff --git a/fs/netfs/objects.c b/fs/netfs/objects.c new file mode 100644 index 000000000000..f7383c28dc6e --- /dev/null +++ b/fs/netfs/objects.c @@ -0,0 +1,123 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* Object lifetime handling and tracing. + * + * Copyright (C) 2022 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + */ + +#include +#include "internal.h" + +/* + * Allocate an I/O request and initialise it. + */ +struct netfs_io_request *netfs_alloc_request( + const struct netfs_request_ops *ops, void *netfs_priv, + struct file *file) +{ + static atomic_t debug_ids; + struct netfs_io_request *rreq; + + rreq = kzalloc(sizeof(struct netfs_io_request), GFP_KERNEL); + if (rreq) { + rreq->netfs_ops = ops; + rreq->netfs_priv = netfs_priv; + rreq->inode = file_inode(file); + rreq->i_size = i_size_read(rreq->inode); + rreq->debug_id = atomic_inc_return(&debug_ids); + INIT_LIST_HEAD(&rreq->subrequests); + INIT_WORK(&rreq->work, netfs_rreq_work); + refcount_set(&rreq->usage, 1); + __set_bit(NETFS_RREQ_IN_PROGRESS, &rreq->flags); + if (ops->init_request) + ops->init_request(rreq, file); + netfs_stat(&netfs_n_rh_rreq); + } + + return rreq; +} + +void netfs_get_request(struct netfs_io_request *rreq) +{ + refcount_inc(&rreq->usage); +} + +void netfs_clear_subrequests(struct netfs_io_request *rreq, bool was_async) +{ + struct netfs_io_subrequest *subreq; + + while (!list_empty(&rreq->subrequests)) { + subreq = list_first_entry(&rreq->subrequests, + struct netfs_io_subrequest, rreq_link); + list_del(&subreq->rreq_link); + netfs_put_subrequest(subreq, was_async); + } +} + +static void netfs_free_request(struct work_struct *work) +{ + struct netfs_io_request *rreq = + container_of(work, struct netfs_io_request, work); + netfs_clear_subrequests(rreq, false); + if (rreq->netfs_priv) + rreq->netfs_ops->cleanup(rreq->mapping, rreq->netfs_priv); + trace_netfs_rreq(rreq, netfs_rreq_trace_free); + if (rreq->cache_resources.ops) + rreq->cache_resources.ops->end_operation(&rreq->cache_resources); + kfree(rreq); + netfs_stat_d(&netfs_n_rh_rreq); +} + +void netfs_put_request(struct netfs_io_request *rreq, bool was_async) +{ + if (refcount_dec_and_test(&rreq->usage)) { + if (was_async) { + rreq->work.func = netfs_free_request; + if (!queue_work(system_unbound_wq, &rreq->work)) + BUG(); + } else { + netfs_free_request(&rreq->work); + } + } +} + +/* + * Allocate and partially initialise an I/O request structure. + */ +struct netfs_io_subrequest *netfs_alloc_subrequest(struct netfs_io_request *rreq) +{ + struct netfs_io_subrequest *subreq; + + subreq = kzalloc(sizeof(struct netfs_io_subrequest), GFP_KERNEL); + if (subreq) { + INIT_LIST_HEAD(&subreq->rreq_link); + refcount_set(&subreq->usage, 2); + subreq->rreq = rreq; + netfs_get_request(rreq); + netfs_stat(&netfs_n_rh_sreq); + } + + return subreq; +} + +void netfs_get_subrequest(struct netfs_io_subrequest *subreq) +{ + refcount_inc(&subreq->usage); +} + +static void __netfs_put_subrequest(struct netfs_io_subrequest *subreq, + bool was_async) +{ + struct netfs_io_request *rreq = subreq->rreq; + + trace_netfs_sreq(subreq, netfs_sreq_trace_free); + kfree(subreq); + netfs_stat_d(&netfs_n_rh_sreq); + netfs_put_request(rreq, was_async); +} + +void netfs_put_subrequest(struct netfs_io_subrequest *subreq, bool was_async) +{ + if (refcount_dec_and_test(&subreq->usage)) + __netfs_put_subrequest(subreq, was_async); +} -- cgit v1.2.3