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// SPDX-License-Identifier: GPL-2.0
/*
* Mainly for aufs which mmap(2) different file and wants to print different
* path in /proc/PID/maps.
* Call these functions via macros defined in linux/mm.h.
*
* See Documentation/filesystems/aufs/design/06mmap.txt
*
* Copyright (c) 2014-2020 Junjro R. Okajima
* Copyright (c) 2014 Ian Campbell
*/
#include <linux/mm.h>
#include <linux/file.h>
#include <linux/fs.h>
/* #define PRFILE_TRACE */
static inline void prfile_trace(struct file *f, struct file *pr,
const char func[], int line, const char func2[])
{
#ifdef PRFILE_TRACE
if (pr)
pr_info("%s:%d: %s, %pD2\n", func, line, func2, f);
#endif
}
void vma_do_file_update_time(struct vm_area_struct *vma, const char func[],
int line)
{
struct file *f = vma->vm_file, *pr = vma->vm_prfile;
prfile_trace(f, pr, func, line, __func__);
file_update_time(f);
if (f && pr)
file_update_time(pr);
}
struct file *vma_do_pr_or_file(struct vm_area_struct *vma, const char func[],
int line)
{
struct file *f = vma->vm_file, *pr = vma->vm_prfile;
prfile_trace(f, pr, func, line, __func__);
return (f && pr) ? pr : f;
}
void vma_do_get_file(struct vm_area_struct *vma, const char func[], int line)
{
struct file *f = vma->vm_file, *pr = vma->vm_prfile;
prfile_trace(f, pr, func, line, __func__);
get_file(f);
if (f && pr)
get_file(pr);
}
void vma_do_fput(struct vm_area_struct *vma, const char func[], int line)
{
struct file *f = vma->vm_file, *pr = vma->vm_prfile;
prfile_trace(f, pr, func, line, __func__);
fput(f);
if (f && pr)
fput(pr);
}
#ifndef CONFIG_MMU
struct file *vmr_do_pr_or_file(struct vm_region *region, const char func[],
int line)
{
struct file *f = region->vm_file, *pr = region->vm_prfile;
prfile_trace(f, pr, func, line, __func__);
return (f && pr) ? pr : f;
}
void vmr_do_fput(struct vm_region *region, const char func[], int line)
{
struct file *f = region->vm_file, *pr = region->vm_prfile;
prfile_trace(f, pr, func, line, __func__);
fput(f);
if (f && pr)
fput(pr);
}
#endif /* !CONFIG_MMU */
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