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namespace: extract show_path() helper

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To be used by the statmount(2) syscall as well.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Link: https://lore.kernel.org/r/20231025140205.3586473-4-mszeredi@redhat.com
Reviewed-by: Ian Kent <raven@themaw.net>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Miklos Szeredi 2023-10-25 16:02:01 +02:00 committed by Christian Brauner
parent 2eea9ce431
commit 56c94c6267
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GPG Key ID: 91C61BC06578DCA2
3 changed files with 14 additions and 7 deletions
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2
fs/internal.h
View File

@ -83,6 +83,8 @@ int path_mount(const char *dev_name, struct path *path,
const char *type_page, unsigned long flags, void *data_page);
int path_umount(struct path *path, int flags);
int show_path(struct seq_file *m, struct dentry *root);
/*
* fs_struct.c
*/

9
fs/namespace.c
View File

@ -4674,6 +4674,15 @@ SYSCALL_DEFINE5(mount_setattr, int, dfd, const char __user *, path,
return err;
}
int show_path(struct seq_file *m, struct dentry *root)
{
if (root->d_sb->s_op->show_path)
return root->d_sb->s_op->show_path(m, root);
seq_dentry(m, root, " \t\n\\");
return 0;
}
static void __init init_mount_tree(void)
{
struct vfsmount *mnt;

10
fs/proc_namespace.c
View File

@ -142,13 +142,9 @@ static int show_mountinfo(struct seq_file *m, struct vfsmount *mnt)
seq_printf(m, "%i %i %u:%u ", r->mnt_id, r->mnt_parent->mnt_id,
MAJOR(sb->s_dev), MINOR(sb->s_dev));
if (sb->s_op->show_path) {
err = sb->s_op->show_path(m, mnt->mnt_root);
if (err)
goto out;
} else {
seq_dentry(m, mnt->mnt_root, " \t\n\\");
}
err = show_path(m, mnt->mnt_root);
if (err)
goto out;
seq_putc(m, ' ');
/* mountpoints outside of chroot jail will give SEQ_SKIP on this */