diff options
| -rw-r--r-- | fs/proc/inode.c | 2 | ||||
| -rw-r--r-- | fs/proc/root.c | 67 | ||||
| -rw-r--r-- | include/linux/pid_namespace.h | 3 | ||||
| -rw-r--r-- | include/linux/proc_fs.h | 3 |
4 files changed, 69 insertions, 6 deletions
diff --git a/fs/proc/inode.c b/fs/proc/inode.c index 99ca00485fc3..abe6a3f04368 100644 --- a/fs/proc/inode.c +++ b/fs/proc/inode.c @@ -448,7 +448,7 @@ out_mod: return NULL; } -int proc_fill_super(struct super_block *s, void *data, int silent) +int proc_fill_super(struct super_block *s) { struct inode * root_inode; diff --git a/fs/proc/root.c b/fs/proc/root.c index cf3046638b09..94e9d734384e 100644 --- a/fs/proc/root.c +++ b/fs/proc/root.c @@ -18,32 +18,90 @@ #include <linux/bitops.h> #include <linux/smp_lock.h> #include <linux/mount.h> +#include <linux/pid_namespace.h> #include "internal.h" struct proc_dir_entry *proc_bus, *proc_root_fs, *proc_root_driver; +static int proc_test_super(struct super_block *sb, void *data) +{ + return sb->s_fs_info == data; +} + +static int proc_set_super(struct super_block *sb, void *data) +{ + struct pid_namespace *ns; + + ns = (struct pid_namespace *)data; + sb->s_fs_info = get_pid_ns(ns); + return set_anon_super(sb, NULL); +} + static int proc_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name, void *data, struct vfsmount *mnt) { + int err; + struct super_block *sb; + struct pid_namespace *ns; + struct proc_inode *ei; + if (proc_mnt) { /* Seed the root directory with a pid so it doesn't need * to be special in base.c. I would do this earlier but * the only task alive when /proc is mounted the first time * is the init_task and it doesn't have any pids. */ - struct proc_inode *ei; ei = PROC_I(proc_mnt->mnt_sb->s_root->d_inode); if (!ei->pid) ei->pid = find_get_pid(1); } - return get_sb_single(fs_type, flags, data, proc_fill_super, mnt); + + if (flags & MS_KERNMOUNT) + ns = (struct pid_namespace *)data; + else + ns = current->nsproxy->pid_ns; + + sb = sget(fs_type, proc_test_super, proc_set_super, ns); + if (IS_ERR(sb)) + return PTR_ERR(sb); + + if (!sb->s_root) { + sb->s_flags = flags; + err = proc_fill_super(sb); + if (err) { + up_write(&sb->s_umount); + deactivate_super(sb); + return err; + } + + ei = PROC_I(sb->s_root->d_inode); + if (!ei->pid) { + rcu_read_lock(); + ei->pid = get_pid(find_pid_ns(1, ns)); + rcu_read_unlock(); + } + + sb->s_flags |= MS_ACTIVE; + ns->proc_mnt = mnt; + } + + return simple_set_mnt(mnt, sb); +} + +static void proc_kill_sb(struct super_block *sb) +{ + struct pid_namespace *ns; + + ns = (struct pid_namespace *)sb->s_fs_info; + kill_anon_super(sb); + put_pid_ns(ns); } static struct file_system_type proc_fs_type = { .name = "proc", .get_sb = proc_get_sb, - .kill_sb = kill_anon_super, + .kill_sb = proc_kill_sb, }; void __init proc_root_init(void) @@ -54,12 +112,13 @@ void __init proc_root_init(void) err = register_filesystem(&proc_fs_type); if (err) return; - proc_mnt = kern_mount(&proc_fs_type); + proc_mnt = kern_mount_data(&proc_fs_type, &init_pid_ns); err = PTR_ERR(proc_mnt); if (IS_ERR(proc_mnt)) { unregister_filesystem(&proc_fs_type); return; } + proc_misc_init(); proc_net_init(); diff --git a/include/linux/pid_namespace.h b/include/linux/pid_namespace.h index 14376ebf4bac..416d4e4ce94e 100644 --- a/include/linux/pid_namespace.h +++ b/include/linux/pid_namespace.h @@ -23,6 +23,9 @@ struct pid_namespace { struct kmem_cache *pid_cachep; int level; struct pid_namespace *parent; +#ifdef CONFIG_PROC_FS + struct vfsmount *proc_mnt; +#endif }; extern struct pid_namespace init_pid_ns; diff --git a/include/linux/proc_fs.h b/include/linux/proc_fs.h index dbd601c7244c..cbc1038c7900 100644 --- a/include/linux/proc_fs.h +++ b/include/linux/proc_fs.h @@ -125,7 +125,8 @@ extern struct proc_dir_entry *create_proc_entry(const char *name, mode_t mode, extern void remove_proc_entry(const char *name, struct proc_dir_entry *parent); extern struct vfsmount *proc_mnt; -extern int proc_fill_super(struct super_block *,void *,int); +struct pid_namespace; +extern int proc_fill_super(struct super_block *); extern struct inode *proc_get_inode(struct super_block *, unsigned int, struct proc_dir_entry *); /* |