fs/netfs/objects.c

Source file repositories/reference/linux-study-clean/fs/netfs/objects.c

File Facts

System
Linux kernel
Corpus path
fs/netfs/objects.c
Extension
.c
Size
7267 bytes
Lines
257
Domain
Core OS
Bucket
VFS And Filesystem Core
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

if (ret < 0) {
			mempool_free(rreq, rreq->netfs_ops->request_pool ?: &netfs_request_pool);
			return ERR_PTR(ret);
		}
	}

	atomic_inc(&ctx->io_count);
	trace_netfs_rreq_ref(rreq->debug_id, refcount_read(&rreq->ref), netfs_rreq_trace_new);
	netfs_proc_add_rreq(rreq);
	netfs_stat(&netfs_n_rh_rreq);
	return rreq;
}

void netfs_get_request(struct netfs_io_request *rreq, enum netfs_rreq_ref_trace what)
{
	int r;

	__refcount_inc(&rreq->ref, &r);
	trace_netfs_rreq_ref(rreq->debug_id, r + 1, what);
}

void netfs_clear_subrequests(struct netfs_io_request *rreq)
{
	struct netfs_io_subrequest *subreq;
	struct netfs_io_stream *stream;
	int s;

	for (s = 0; s < ARRAY_SIZE(rreq->io_streams); s++) {
		stream = &rreq->io_streams[s];
		while (!list_empty(&stream->subrequests)) {
			subreq = list_first_entry(&stream->subrequests,
						  struct netfs_io_subrequest, rreq_link);
			list_del(&subreq->rreq_link);
			netfs_put_subrequest(subreq, netfs_sreq_trace_put_clear);
		}
	}
}

static void netfs_free_request_rcu(struct rcu_head *rcu)
{
	struct netfs_io_request *rreq = container_of(rcu, struct netfs_io_request, rcu);

	mempool_free(rreq, rreq->netfs_ops->request_pool ?: &netfs_request_pool);
	netfs_stat_d(&netfs_n_rh_rreq);
}

static void netfs_deinit_request(struct netfs_io_request *rreq)
{
	struct netfs_inode *ictx = netfs_inode(rreq->inode);
	unsigned int i;

	trace_netfs_rreq(rreq, netfs_rreq_trace_free);

	/* Cancel/flush the result collection worker.  That does not carry a
	 * ref of its own, so we must wait for it somewhere.
	 */
	cancel_work_sync(&rreq->work);

	netfs_proc_del_rreq(rreq);
	netfs_clear_subrequests(rreq);
	if (rreq->netfs_ops->free_request)
		rreq->netfs_ops->free_request(rreq);
	if (rreq->cache_resources.ops)
		rreq->cache_resources.ops->end_operation(&rreq->cache_resources);
	if (rreq->direct_bv) {
		for (i = 0; i < rreq->direct_bv_count; i++) {
			if (rreq->direct_bv[i].bv_page) {
				if (rreq->direct_bv_unpin)
					unpin_user_page(rreq->direct_bv[i].bv_page);
			}
		}
		kvfree(rreq->direct_bv);
	}
	rolling_buffer_clear(&rreq->buffer);

	if (atomic_dec_and_test(&ictx->io_count))
		wake_up_var(&ictx->io_count);
}

static void netfs_free_request(struct work_struct *work)
{
	struct netfs_io_request *rreq =
		container_of(work, struct netfs_io_request, cleanup_work);

	netfs_deinit_request(rreq);
	call_rcu(&rreq->rcu, netfs_free_request_rcu);
}

void netfs_put_request(struct netfs_io_request *rreq, enum netfs_rreq_ref_trace what)
{

Annotation

Implementation Notes