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