#include #include #include #include #include #include #include #include #include static struct vfsmount *nsfs_mnt; static long ns_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg); static const struct file_operations ns_file_operations = { .llseek = no_llseek, .unlocked_ioctl = ns_ioctl, }; static char *ns_dname(struct dentry *dentry, char *buffer, int buflen) { struct inode *inode = d_inode(dentry); const struct proc_ns_operations *ns_ops = dentry->d_fsdata; return dynamic_dname(dentry, buffer, buflen, "%s:[%lu]", ns_ops->name, inode->i_ino); } static void ns_prune_dentry(struct dentry *dentry) { struct inode *inode = d_inode(dentry); if (inode) { struct ns_common *ns = inode->i_private; atomic_long_set(&ns->stashed, 0); } } const struct dentry_operations ns_dentry_operations = { .d_prune = ns_prune_dentry, .d_delete = always_delete_dentry, .d_dname = ns_dname, }; static void nsfs_evict(struct inode *inode) { struct ns_common *ns = inode->i_private; clear_inode(inode); ns->ops->put(ns); } static void *__ns_get_path(struct path *path, struct ns_common *ns) { struct vfsmount *mnt = nsfs_mnt; struct qstr qname = { .name = "", }; struct dentry *dentry; struct inode *inode; unsigned long d; rcu_read_lock(); d = atomic_long_read(&ns->stashed); if (!d) goto slow; dentry = (struct dentry *)d; if (!lockref_get_not_dead(&dentry->d_lockref)) goto slow; rcu_read_unlock(); ns->ops->put(ns); got_it: path->mnt = mntget(mnt); path->dentry = dentry; return NULL; slow: rcu_read_unlock(); inode = new_inode_pseudo(mnt->mnt_sb); if (!inode) { ns->ops->put(ns); return ERR_PTR(-ENOMEM); } inode->i_ino = ns->inum; inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode); inode->i_flags |= S_IMMUTABLE; inode->i_mode = S_IFREG | S_IRUGO; inode->i_fop = &ns_file_operations; inode->i_private = ns; dentry = d_alloc_pseudo(mnt->mnt_sb, &qname); if (!dentry) { iput(inode); return ERR_PTR(-ENOMEM); } d_instantiate(dentry, inode); dentry->d_fsdata = (void *)ns->ops; d = atomic_long_cmpxchg(&ns->stashed, 0, (unsigned long)dentry); if (d) { d_delete(dentry); /* make sure ->d_prune() does nothing */ dput(dentry); cpu_relax(); return ERR_PTR(-EAGAIN); } goto got_it; } void *ns_get_path(struct path *path, struct task_struct *task, const struct proc_ns_operations *ns_ops) { struct ns_common *ns; void *ret; again: ns = ns_ops->get(task); if (!ns) return ERR_PTR(-ENOENT); ret = __ns_get_path(path, ns); if (IS_ERR(ret) && PTR_ERR(ret) == -EAGAIN) goto again; return ret; } int open_related_ns(struct ns_common *ns, struct ns_common *(*get_ns)(struct ns_common *ns)) { struct path path = {}; struct file *f; void *err; int fd; fd = get_unused_fd_flags(O_CLOEXEC); if (fd < 0) return fd; while (1) { struct ns_common *relative; relative = get_ns(ns); if (IS_ERR(relative)) { put_unused_fd(fd); return PTR_ERR(relative); } err = __ns_get_path(&path, relative); if (IS_ERR(err) && PTR_ERR(err) == -EAGAIN) continue; break; } if (IS_ERR(err)) { put_unused_fd(fd); return PTR_ERR(err); } f = dentry_open(&path, O_RDONLY, current_cred()); path_put(&path); if (IS_ERR(f)) { put_unused_fd(fd); fd = PTR_ERR(f); } else fd_install(fd, f); return fd; } static long ns_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg) { struct ns_common *ns = get_proc_ns(file_inode(filp)); switch (ioctl) { case NS_GET_USERNS: return open_related_ns(ns, ns_get_owner); case NS_GET_PARENT: if (!ns->ops->get_parent) return -EINVAL; return open_related_ns(ns, ns->ops->get_parent); default: return -ENOTTY; } } int ns_get_name(char *buf, size_t size, struct task_struct *task, const struct proc_ns_operations *ns_ops) { struct ns_common *ns; int res = -ENOENT; ns = ns_ops->get(task); if (ns) { res = snprintf(buf, size, "%s:[%u]", ns_ops->name, ns->inum); ns_ops->put(ns); } return res; } struct file *proc_ns_fget(int fd) { struct file *file; file = fget(fd); if (!file) return ERR_PTR(-EBADF); if (file->f_op != &ns_file_operations) goto out_invalid; return file; out_invalid: fput(file); return ERR_PTR(-EINVAL); } static int nsfs_show_path(struct seq_file *seq, struct dentry *dentry) { struct inode *inode = d_inode(dentry); const struct proc_ns_operations *ns_ops = dentry->d_fsdata; seq_printf(seq, "%s:[%lu]", ns_ops->name, inode->i_ino); return 0; } static const struct super_operations nsfs_ops = { .statfs = simple_statfs, .evict_inode = nsfs_evict, .show_path = nsfs_show_path, }; static struct dentry *nsfs_mount(struct file_system_type *fs_type, int flags, const char *dev_name, void *data) { return mount_pseudo(fs_type, "nsfs:", &nsfs_ops, &ns_dentry_operations, NSFS_MAGIC); } static struct file_system_type nsfs = { .name = "nsfs", .mount = nsfs_mount, .kill_sb = kill_anon_super, }; void __init nsfs_init(void) { nsfs_mnt = kern_mount(&nsfs); if (IS_ERR(nsfs_mnt)) panic("can't set nsfs up\n"); nsfs_mnt->mnt_sb->s_flags &= ~MS_NOUSER; } lass='ls-size'>14443logplain -rw-r--r--drm_atomic_helper.h10607logplain -rw-r--r--drm_auth.h2260logplain -rw-r--r--drm_blend.h2700logplain -rw-r--r--drm_bridge.h7977logplain -rw-r--r--drm_cache.h1763logplain -rw-r--r--drm_color_mgmt.h2166logplain -rw-r--r--drm_connector.h28613logplain -rw-r--r--drm_crtc.h28999logplain -rw-r--r--drm_crtc_helper.h3301logplain -rw-r--r--drm_debugfs_crc.h2670logplain -rw-r--r--drm_displayid.h2850logplain -rw-r--r--drm_dp_dual_mode_helper.h4532logplain -rw-r--r--drm_dp_helper.h30638logplain -rw-r--r--drm_dp_mst_helper.h16260logplain -rw-r--r--drm_drv.h14861logplain -rw-r--r--drm_edid.h14335logplain -rw-r--r--drm_encoder.h8160logplain -rw-r--r--drm_encoder_slave.h6583logplain -rw-r--r--drm_fb_cma_helper.h1929logplain -rw-r--r--drm_fb_helper.h15125logplain -rw-r--r--drm_fixed.h4825logplain -rw-r--r--drm_flip_work.h3071logplain -rw-r--r--drm_fourcc.h2748logplain -rw-r--r--drm_framebuffer.h9623logplain -rw-r--r--drm_gem.h8052logplain -rw-r--r--drm_gem_cma_helper.h2286logplain -rw-r--r--drm_global.h2011logplain -rw-r--r--drm_hashtab.h3139logplain -rw-r--r--drm_irq.h6323logplain -rw-r--r--drm_legacy.h6933logplain -rw-r--r--drm_mem_util.h2468logplain -rw-r--r--drm_mipi_dsi.h10327logplain -rw-r--r--drm_mm.h11462logplain -rw-r--r--drm_mode_config.h23728logplain -rw-r--r--drm_mode_object.h4911logplain -rw-r--r--drm_modes.h17078logplain -rw-r--r--drm_modeset_helper.h1576logplain -rw-r--r--drm_modeset_helper_vtables.h41180logplain -rw-r--r--drm_modeset_lock.h4241logplain -rw-r--r--drm_of.h2034logplain -rw-r--r--drm_os_linux.h2230logplain -rw-r--r--drm_panel.h7079logplain -rw-r--r--drm_pciids.h68035logplain -rw-r--r--drm_plane.h19435logplain -rw-r--r--drm_plane_helper.h3186logplain -rw-r--r--drm_print.h3232logplain -rw-r--r--drm_property.h11460logplain -rw-r--r--drm_rect.h5103logplain -rw-r--r--drm_simple_kms_helper.h4090logplain -rw-r--r--drm_sysfs.h300logplain -rw-r--r--drm_vma_manager.h7840logplain -rw-r--r--gma_drm.h1033logplain d---------i2c109logplain