github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-09-14 16:10:02 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

nullfs: make nullfs multi-instance

Browse Source 
Allow multiple instances of nullfs to be created. Right now we're only
going to use it for kernel-internal purposes but ultimately we can allow
userspace to use it too to e.g., safely overmount stuff.

Link: https://patch.msgid.link/20260601-work-kthread-nullfs-v4-22-77ee053060e0@kernel.org
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
This commit is contained in:
Christian Brauner 2026-06-01 15:56:55 +02:00
parent 66d2faeccb
commit e435696d57
No known key found for this signature in database
GPG Key ID: 91C61BC06578DCA2
1 changed files with 3 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
fs/nullfs.c
View File

@ -40,14 +40,9 @@ static int nullfs_fs_fill_super(struct super_block *s, struct fs_context *fc)
return 0;
}
/*
* For now this is a single global instance. If needed we can make it
* mountable by userspace at which point we will need to make it
* multi-instance.
*/
static int nullfs_fs_get_tree(struct fs_context *fc)
{
return get_tree_single(fc, nullfs_fs_fill_super);
return get_tree_nodev(fc, nullfs_fs_fill_super);
}
static const struct fs_context_operations nullfs_fs_context_ops = {
@ -57,9 +52,8 @@ static const struct fs_context_operations nullfs_fs_context_ops = {
static int nullfs_init_fs_context(struct fs_context *fc)
{
fc->ops = &nullfs_fs_context_ops;
fc->global = true;
fc->sb_flags = SB_NOUSER;
fc->s_iflags = SB_I_NOEXEC | SB_I_NODEV;
fc->sb_flags |= SB_NOUSER;
fc->s_iflags |= SB_I_NOEXEC | SB_I_NODEV;
return 0;
}