projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| c088e31d SF |
1 | /* |
| 2 | * SPDX-License-Identifier: GPL-2.0 | |
| 3 | * Mainly for aufs which mmap(2) different file and wants to print different | |
| 4 | * path in /proc/PID/maps. | |
| 5 | * Call these functions via macros defined in linux/mm.h. | |
| 6 | * | |
| 7 | * See Documentation/filesystems/aufs/design/06mmap.txt | |
| 8 | * | |
| 9 | * Copyright (c) 2014-2017 Junjro R. Okajima | |
| 10 | * Copyright (c) 2014 Ian Campbell | |
| 11 | */ | |
| 12 | ||
| 13 | #include <linux/mm.h> | |
| 14 | #include <linux/file.h> | |
| 15 | #include <linux/fs.h> | |
| 16 | ||
| 17 | /* #define PRFILE_TRACE */ | |
| 18 | static inline void prfile_trace(struct file *f, struct file *pr, | |
| 19 | const char func[], int line, const char func2[]) | |
| 20 | { | |
| 21 | #ifdef PRFILE_TRACE | |
| 22 | if (pr) | |
| 23 | pr_info("%s:%d: %s, %pD2\n", func, line, func2, f); | |
| 24 | #endif | |
| 25 | } | |
| 26 | ||
| 27 | void vma_do_file_update_time(struct vm_area_struct *vma, const char func[], | |
| 28 | int line) | |
| 29 | { | |
| 30 | struct file *f = vma->vm_file, *pr = vma->vm_prfile; | |
| 31 | ||
| 32 | prfile_trace(f, pr, func, line, __func__); | |
| 33 | file_update_time(f); | |
| 34 | if (f && pr) | |
| 35 | file_update_time(pr); | |
| 36 | } | |
| 37 | ||
| 38 | struct file *vma_do_pr_or_file(struct vm_area_struct *vma, const char func[], | |
| 39 | int line) | |
| 40 | { | |
| 41 | struct file *f = vma->vm_file, *pr = vma->vm_prfile; | |
| 42 | ||
| 43 | prfile_trace(f, pr, func, line, __func__); | |
| 44 | return (f && pr) ? pr : f; | |
| 45 | } | |
| 46 | ||
| 47 | void vma_do_get_file(struct vm_area_struct *vma, const char func[], int line) | |
| 48 | { | |
| 49 | struct file *f = vma->vm_file, *pr = vma->vm_prfile; | |
| 50 | ||
| 51 | prfile_trace(f, pr, func, line, __func__); | |
| 52 | get_file(f); | |
| 53 | if (f && pr) | |
| 54 | get_file(pr); | |
| 55 | } | |
| 56 | ||
| 57 | void vma_do_fput(struct vm_area_struct *vma, const char func[], int line) | |
| 58 | { | |
| 59 | struct file *f = vma->vm_file, *pr = vma->vm_prfile; | |
| 60 | ||
| 61 | prfile_trace(f, pr, func, line, __func__); | |
| 62 | fput(f); | |
| 63 | if (f && pr) | |
| 64 | fput(pr); | |
| 65 | } | |
| 66 | ||
| 67 | #ifndef CONFIG_MMU | |
| 68 | struct file *vmr_do_pr_or_file(struct vm_region *region, const char func[], | |
| 69 | int line) | |
| 70 | { | |
| 71 | struct file *f = region->vm_file, *pr = region->vm_prfile; | |
| 72 | ||
| 73 | prfile_trace(f, pr, func, line, __func__); | |
| 74 | return (f && pr) ? pr : f; | |
| 75 | } | |
| 76 | ||
| 77 | void vmr_do_fput(struct vm_region *region, const char func[], int line) | |
| 78 | { | |
| 79 | struct file *f = region->vm_file, *pr = region->vm_prfile; | |
| 80 | ||
| 81 | prfile_trace(f, pr, func, line, __func__); | |
| 82 | fput(f); | |
| 83 | if (f && pr) | |
| 84 | fput(pr); | |
| 85 | } | |
| 86 | #endif /* !CONFIG_MMU */ |