X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;f=lib%2Fringbuffer%2Fring_buffer_mmap.c;fp=lib%2Fringbuffer%2Fring_buffer_mmap.c;h=0000000000000000000000000000000000000000;hb=cfa6cc1d0f01c2cfcc1a679abf3a6572d411c309;hp=34174a587ab4af1a8d601d752a89ae31e92a4b29;hpb=cd4486798c2b046ea93b89439cd705e93c40b349;p=lttng-modules.git

diff --git a/lib/ringbuffer/ring_buffer_mmap.c b/lib/ringbuffer/ring_buffer_mmap.c
deleted file mode 100644
index 34174a58..00000000
--- a/lib/ringbuffer/ring_buffer_mmap.c
+++ /dev/null
@@ -1,139 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-only
- *
- * ring_buffer_mmap.c
- *
- * Copyright (C) 2002-2005 - Tom Zanussi <zanussi@us.ibm.com>, IBM Corp
- * Copyright (C) 1999-2005 - Karim Yaghmour <karim@opersys.com>
- * Copyright (C) 2008-2012 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * Re-using code from kernel/relay.c, hence the GPL-2.0-only license for this
- * file.
- */
-
-#include <linux/module.h>
-#include <linux/mm.h>
-
-#include <ringbuffer/backend.h>
-#include <ringbuffer/frontend.h>
-#include <ringbuffer/vfs.h>
-
-/*
- * fault() vm_op implementation for ring buffer file mapping.
- */
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,1,0))
-static vm_fault_t lib_ring_buffer_fault_compat(struct vm_area_struct *vma, struct vm_fault *vmf)
-#else
-static int lib_ring_buffer_fault_compat(struct vm_area_struct *vma, struct vm_fault *vmf)
-#endif
-{
-	struct lib_ring_buffer *buf = vma->vm_private_data;
-	struct channel *chan = buf->backend.chan;
-	const struct lib_ring_buffer_config *config = &chan->backend.config;
-	pgoff_t pgoff = vmf->pgoff;
-	unsigned long *pfnp;
-	void **virt;
-	unsigned long offset, sb_bindex;
-
-	/*
-	 * Verify that faults are only done on the range of pages owned by the
-	 * reader.
-	 */
-	offset = pgoff << PAGE_SHIFT;
-	sb_bindex = subbuffer_id_get_index(config, buf->backend.buf_rsb.id);
-	if (!(offset >= buf->backend.array[sb_bindex]->mmap_offset
-	      && offset < buf->backend.array[sb_bindex]->mmap_offset +
-			  buf->backend.chan->backend.subbuf_size))
-		return VM_FAULT_SIGBUS;
-	/*
-	 * ring_buffer_read_get_pfn() gets the page frame number for the
-	 * current reader's pages.
-	 */
-	pfnp = lib_ring_buffer_read_get_pfn(&buf->backend, offset, &virt);
-	if (!*pfnp)
-		return VM_FAULT_SIGBUS;
-	get_page(pfn_to_page(*pfnp));
-	vmf->page = pfn_to_page(*pfnp);
-
-	return 0;
-}
-
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,1,0))
-static vm_fault_t lib_ring_buffer_fault(struct vm_fault *vmf)
-{
-	struct vm_area_struct *vma = vmf->vma;
-	return lib_ring_buffer_fault_compat(vma, vmf);
-}
-#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(4,11,0))
-static int lib_ring_buffer_fault(struct vm_fault *vmf)
-{
-	struct vm_area_struct *vma = vmf->vma;
-	return lib_ring_buffer_fault_compat(vma, vmf);
-}
-#else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,11,0)) */
-static int lib_ring_buffer_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
-{
-	return lib_ring_buffer_fault_compat(vma, vmf);
-}
-#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,11,0)) */
-
-/*
- * vm_ops for ring buffer file mappings.
- */
-static const struct vm_operations_struct lib_ring_buffer_mmap_ops = {
-	.fault = lib_ring_buffer_fault,
-};
-
-/**
- *	lib_ring_buffer_mmap_buf: - mmap channel buffer to process address space
- *	@buf: ring buffer to map
- *	@vma: vm_area_struct describing memory to be mapped
- *
- *	Returns 0 if ok, negative on error
- *
- *	Caller should already have grabbed mmap_sem.
- */
-static int lib_ring_buffer_mmap_buf(struct lib_ring_buffer *buf,
-				    struct vm_area_struct *vma)
-{
-	unsigned long length = vma->vm_end - vma->vm_start;
-	struct channel *chan = buf->backend.chan;
-	const struct lib_ring_buffer_config *config = &chan->backend.config;
-	unsigned long mmap_buf_len;
-
-	if (config->output != RING_BUFFER_MMAP)
-		return -EINVAL;
-
-	mmap_buf_len = chan->backend.buf_size;
-	if (chan->backend.extra_reader_sb)
-		mmap_buf_len += chan->backend.subbuf_size;
-
-	if (length != mmap_buf_len)
-		return -EINVAL;
-
-	vma->vm_ops = &lib_ring_buffer_mmap_ops;
-	vma->vm_flags |= VM_DONTEXPAND;
-	vma->vm_private_data = buf;
-
-	return 0;
-}
-
-int lib_ring_buffer_mmap(struct file *filp, struct vm_area_struct *vma,
-		struct lib_ring_buffer *buf)
-{
-	return lib_ring_buffer_mmap_buf(buf, vma);
-}
-EXPORT_SYMBOL_GPL(lib_ring_buffer_mmap);
-
-/**
- *	vfs_lib_ring_buffer_mmap - mmap file op
- *	@filp: the file
- *	@vma: the vma describing what to map
- *
- *	Calls upon lib_ring_buffer_mmap_buf() to map the file into user space.
- */
-int vfs_lib_ring_buffer_mmap(struct file *filp, struct vm_area_struct *vma)
-{
-	struct lib_ring_buffer *buf = filp->private_data;
-	return lib_ring_buffer_mmap(filp, vma, buf);
-}
-EXPORT_SYMBOL_GPL(vfs_lib_ring_buffer_mmap);