diff options
author | Amir Goldstein <amir73il@gmail.com> | 2023-10-09 18:37:11 +0300 |
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committer | Christian Brauner <brauner@kernel.org> | 2023-10-19 12:03:15 +0300 |
commit | 08582d678fcf11fc86188f0b92239d3d49667d8e (patch) | |
tree | c4cc4f56b752f97a3eb90f2886904b49d72028c9 /include/linux | |
parent | 83bc1d294130cc471a89ce10770daa281a93fcb0 (diff) | |
download | linux-08582d678fcf11fc86188f0b92239d3d49667d8e.tar.xz |
fs: create helper file_user_path() for user displayed mapped file path
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>
Diffstat (limited to 'include/linux')
-rw-r--r-- | include/linux/fs.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h index ceafc40cc25f..057a3bbd4d27 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -2513,6 +2513,20 @@ static inline const struct path *file_real_path(struct file *f) return &f->f_path; } +/* + * file_user_path - get the path to display for memory mapped file + * + * When mmapping a file on a stackable filesystem (e.g., overlayfs), the file + * stored in ->vm_file is a backing file whose f_inode is on the underlying + * filesystem. When the mapped file path is displayed to user (e.g. via + * /proc/<pid>/maps), this helper should be used to get the path to display + * to the user, which is the path of the fd that user has requested to map. + */ +static inline const struct path *file_user_path(struct file *f) +{ + return &f->f_path; +} + static inline struct file *file_clone_open(struct file *file) { return dentry_open(&file->f_path, file->f_flags, file->f_cred); |