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fs: create helper file_user_path() for user displayed mapped file path

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Overlayfs uses backing files with "fake" overlayfs f_path and "real"
underlying f_inode, in order to use underlying inode aops for mapped
files and to display the overlayfs path in /proc/<pid>/maps.

In preparation for storing the overlayfs "fake" path instead of the
underlying "real" path in struct backing_file, define a noop helper
file_user_path() that returns f_path for now.

Use the new helper in procfs and kernel logs whenever a path of a
mapped file is displayed to users.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Link: https://lore.kernel.org/r/20231009153712.1566422-3-amir73il@gmail.com
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Amir Goldstein
2023-10-09 18:37:11 +03:00
committed by Christian Brauner
parent 83bc1d2941
commit 08582d678f
7 changed files with 24 additions and 8 deletions
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6
arch/arc/kernel/troubleshoot.c
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@ -90,10 +90,12 @@ static void show_faulting_vma(unsigned long address)
*/
if (vma) {
char buf[ARC_PATH_MAX];
char *nm = "?";
char *nm = "anon";
if (vma->vm_file) {
nm = file_path(vma->vm_file, buf, ARC_PATH_MAX-1);
/* XXX: can we use %pD below and get rid of buf? */
nm = d_path(file_user_path(vma->vm_file), buf,
ARC_PATH_MAX-1);
if (IS_ERR(nm))
nm = "?";
}