diff options
author | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-09-23 12:33:14 -0300 |
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committer | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-09-23 12:33:14 -0300 |
commit | a700f2d8e79ff80041078f160fe1edccf89b0c66 (patch) | |
tree | 070bc692c19c5980c081222a6f7223869b1560f3 /mm/prfile.c | |
parent | d5ad8b932c22e2790c2b27351116de96603df63a (diff) |
Linux-libre 4.2.1-gnupck-4.2.1-gnu
Diffstat (limited to 'mm/prfile.c')
-rw-r--r-- | mm/prfile.c | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/mm/prfile.c b/mm/prfile.c new file mode 100644 index 000000000..b323b8af9 --- /dev/null +++ b/mm/prfile.c @@ -0,0 +1,86 @@ +/* + * Mainly for aufs which mmap(2) diffrent 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 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, %s\n", func, line, func2, + f ? (char *)f->f_path.dentry->d_name.name : "(null)"); +#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 */ |