Warn and return on fd overflow fdt

[lttng-modules.git] / lib / ringbuffer / ring_buffer_mmap.c

diff --git a/lib/ringbuffer/ring_buffer_mmap.c b/lib/ringbuffer/ring_buffer_mmap.c
deleted file mode 100644 (file)
index 4b1b7b3..0000000
--- a/lib/ringbuffer/ring_buffer_mmap.c
+++ /dev/null
@@ -1,141 +0,0 @@
-/*
- * 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>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; only version 2 of the License.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Re-using code from kernel/relay.c, hence the GPLv2 license for this
- * file.
- */
-
-#include <linux/module.h>
-#include <linux/mm.h>
-
-#include <wrapper/ringbuffer/backend.h>
-#include <wrapper/ringbuffer/frontend.h>
-#include <wrapper/ringbuffer/vfs.h>
-
-/*
- * fault() vm_op implementation for ring buffer file mapping.
- */
-static int lib_ring_buffer_fault_compat(struct vm_area_struct *vma, struct vm_fault *vmf)
-{
-       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(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);