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fs: constify file ptr in backing_file accessor helpers

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Add internal helper backing_file_set_user_path() for the only
two cases that need to modify backing_file fields.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Link: https://lore.kernel.org/20250607115304.2521155-2-amir73il@gmail.com
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Amir Goldstein 2025-06-07 13:53:03 +02:00 committed by Christian Brauner
parent bc9241367a
commit 4e301d858a
No known key found for this signature in database
GPG Key ID: 91C61BC06578DCA2
4 changed files with 14 additions and 10 deletions
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4
fs/backing-file.c
View File

@ -41,7 +41,7 @@ struct file *backing_file_open(const struct path *user_path, int flags,
return f;
path_get(user_path);
*backing_file_user_path(f) = *user_path;
backing_file_set_user_path(f, user_path);
error = vfs_open(real_path, f);
if (error) {
fput(f);
@ -65,7 +65,7 @@ struct file *backing_tmpfile_open(const struct path *user_path, int flags,
return f;
path_get(user_path);
*backing_file_user_path(f) = *user_path;
backing_file_set_user_path(f, user_path);
error = vfs_tmpfile(real_idmap, real_parentpath, f, mode);
if (error) {
fput(f);

13
fs/file_table.c
View File

@ -52,17 +52,20 @@ struct backing_file {
};
};
static inline struct backing_file *backing_file(struct file *f)
{
return container_of(f, struct backing_file, file);
}
#define backing_file(f) container_of(f, struct backing_file, file)
struct path *backing_file_user_path(struct file *f)
struct path *backing_file_user_path(const struct file *f)
{
return &backing_file(f)->user_path;
}
EXPORT_SYMBOL_GPL(backing_file_user_path);
void backing_file_set_user_path(struct file *f, const struct path *path)
{
backing_file(f)->user_path = *path;
}
EXPORT_SYMBOL_GPL(backing_file_set_user_path);
static inline void file_free(struct file *f)
{
security_file_free(f);

1
fs/internal.h
View File

@ -101,6 +101,7 @@ extern void chroot_fs_refs(const struct path *, const struct path *);
struct file *alloc_empty_file(int flags, const struct cred *cred);
struct file *alloc_empty_file_noaccount(int flags, const struct cred *cred);
struct file *alloc_empty_backing_file(int flags, const struct cred *cred);
void backing_file_set_user_path(struct file *f, const struct path *path);
static inline void file_put_write_access(struct file *file)
{

6
include/linux/fs.h
View File

@ -2864,7 +2864,7 @@ struct file *dentry_open_nonotify(const struct path *path, int flags,
const struct cred *cred);
struct file *dentry_create(const struct path *path, int flags, umode_t mode,
const struct cred *cred);
struct path *backing_file_user_path(struct file *f);
struct path *backing_file_user_path(const struct file *f);
/*
* When mmapping a file on a stackable filesystem (e.g., overlayfs), the file
@ -2876,14 +2876,14 @@ struct path *backing_file_user_path(struct file *f);
* by fstat() on that same fd.
*/
/* Get the path to display in /proc/<pid>/maps */
static inline const struct path *file_user_path(struct file *f)
static inline const struct path *file_user_path(const struct file *f)
{
if (unlikely(f->f_mode & FMODE_BACKING))
return backing_file_user_path(f);
return &f->f_path;
}
/* Get the inode whose inode number to display in /proc/<pid>/maps */
static inline const struct inode *file_user_inode(struct file *f)
static inline const struct inode *file_user_inode(const struct file *f)
{
if (unlikely(f->f_mode & FMODE_BACKING))
return d_inode(backing_file_user_path(f)->dentry);