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Reapply "kernel: expose umount list to ioctl interface #2950"

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This reverts commit 088996da9b.
This commit is contained in:
ShirkNeko
2025-11-20 20:07:59 +08:00
parent cc78812f50
commit 8250c0ecc2
48 changed files with 257 additions and 271 deletions
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36
kernel/kernel_umount.c
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@@ -43,24 +43,6 @@ static const struct ksu_feature_handler kernel_umount_handler = {
.set_handler = kernel_umount_feature_set,
};
static bool should_umount(struct path *path)
{
if (!path) {
return false;
}
if (current->nsproxy->mnt_ns == init_nsproxy.mnt_ns) {
pr_info("ignore global mnt namespace process: %d\n", current_uid().val);
return false;
}
if (path->mnt && path->mnt->mnt_sb && path->mnt->mnt_sb->s_type) {
const char *fstype = path->mnt->mnt_sb->s_type->name;
return strcmp(fstype, "overlay") == 0;
}
return false;
}
extern int path_umount(struct path *path, int flags);
static void ksu_umount_mnt(struct path *path, int flags)
@@ -71,7 +53,7 @@ static void ksu_umount_mnt(struct path *path, int flags)
}
}
void try_umount(const char *mnt, bool check_mnt, int flags)
void try_umount(const char *mnt, int flags)
{
struct path path;
int err = kern_path(mnt, 0, &path);
@@ -85,12 +67,6 @@ void try_umount(const char *mnt, bool check_mnt, int flags)
return;
}
// we are only interest in some specific mounts
if (check_mnt && !should_umount(&path)) {
path_put(&path);
return;
}
ksu_umount_mnt(&path, flags);
}
@@ -107,8 +83,14 @@ static void umount_tw_func(struct callback_head *cb)
saved = override_creds(tw->old_cred);
}
// fixme: use `collect_mounts` and `iterate_mount` to iterate all mountpoint and
// filter the mountpoint whose target is `/data/adb`
struct mount_entry *entry;
down_read(&mount_list_lock);
list_for_each_entry(entry, &mount_list, list) {
pr_info("%s: unmounting: %s flags 0x%x\n", __func__, entry->umountable, entry->flags);
try_umount(entry->umountable, entry->flags);
}
up_read(&mount_list_lock);
ksu_umount_manager_execute_all(tw->old_cred);
if (saved)