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pidfs: add pidfs_root_path() helper

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Allow to return the root of the global pidfs filesystem.

Link: https://lore.kernel.org/20250624-work-pidfs-fhandle-v2-4-d02a04858fe3@kernel.org
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner
2025-06-24 10:29:07 +02:00
parent f7be8a3332
commit a0d8051cfd
2 changed files with 12 additions and 0 deletions
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1
fs/internal.h
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@@ -353,3 +353,4 @@ int anon_inode_getattr(struct mnt_idmap *idmap, const struct path *path,
unsigned int query_flags);
int anon_inode_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
struct iattr *attr);
void pidfs_get_root(struct path *path);

11
fs/pidfs.c
View File

@@ -31,6 +31,14 @@
static struct kmem_cache *pidfs_attr_cachep __ro_after_init;
static struct kmem_cache *pidfs_xattr_cachep __ro_after_init;
static struct path pidfs_root_path = {};
void pidfs_get_root(struct path *path)
{
*path = pidfs_root_path;
path_get(path);
}
/*
* Stashes information that userspace needs to access even after the
* process has been reaped.
@@ -1068,4 +1076,7 @@ void __init pidfs_init(void)
pidfs_mnt = kern_mount(&pidfs_type);
if (IS_ERR(pidfs_mnt))
panic("Failed to mount pidfs pseudo filesystem");
pidfs_root_path.mnt = pidfs_mnt;
pidfs_root_path.dentry = pidfs_mnt->mnt_root;
}