Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
fs: use boolean to indicate anonymous mount namespace
Stop playing games with the namespace id and use a boolean instead:
* This will remove the special-casing we need to do everywhere for mount
namespaces.
* It will allow us to use asserts on the namespace id for initial
namespaces everywhere.
* It will allow us to put anonymous mount namespaces on the namespaces
trees in the future and thus make them available to statmount() and
listmount().
Link: https://patch.msgid.link/20251110-work-namespace-nstree-fixes-v1-10-e8a9264e0fb9@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
+5
-3
+2
-1
fs/mount.h
+2
-1
fs/mount.h
···
27
27
unsigned int nr_mounts; /* # of mounts in the namespace */
28
28
unsigned int pending_mounts;
29
29
refcount_t passive; /* number references not pinning @mounts */
30
+
bool is_anon;
30
31
} __randomize_layout;
31
32
32
33
struct mnt_pcp {
···
176
175
177
176
static inline bool is_anon_ns(struct mnt_namespace *ns)
178
177
{
179
-
return ns->ns.ns_id == 0;
178
+
return ns->is_anon;
180
179
}
181
180
182
181
static inline bool anon_ns_root(const struct mount *m)
+3
-2
fs/namespace.c
+3
-2
fs/namespace.c
···
4093
4093
dec_mnt_namespaces(ucounts);
4094
4094
return ERR_PTR(ret);
4095
4095
}
4096
-
if (!anon)
4097
-
ns_tree_gen_id(new_ns);
4096
+
ns_tree_gen_id(new_ns);
4097
+
4098
+
new_ns->is_anon = anon;
4098
4099
refcount_set(&new_ns->passive, 1);
4099
4100
new_ns->mounts = RB_ROOT;
4100
4101
init_waitqueue_head(&new_ns->poll);