Al Viro | b2dba1a | 2011-11-23 19:26:23 -0500 | [diff] [blame] | 1 | #include <linux/mount.h> |
Al Viro | 0226f49 | 2011-12-06 12:21:54 -0500 | [diff] [blame] | 2 | #include <linux/seq_file.h> |
| 3 | #include <linux/poll.h> |
| 4 | |
| 5 | struct mnt_namespace { |
| 6 | atomic_t count; |
Eric W. Biederman | 98f842e | 2011-06-15 10:21:48 -0700 | [diff] [blame] | 7 | unsigned int proc_inum; |
Al Viro | be08d6d | 2011-12-06 13:32:36 -0500 | [diff] [blame] | 8 | struct mount * root; |
Al Viro | 0226f49 | 2011-12-06 12:21:54 -0500 | [diff] [blame] | 9 | struct list_head list; |
Eric W. Biederman | 771b137 | 2012-07-26 21:08:32 -0700 | [diff] [blame] | 10 | struct user_namespace *user_ns; |
Eric W. Biederman | 8823c07 | 2010-03-07 18:49:36 -0800 | [diff] [blame] | 11 | u64 seq; /* Sequence number to prevent loops */ |
Al Viro | 0226f49 | 2011-12-06 12:21:54 -0500 | [diff] [blame] | 12 | wait_queue_head_t poll; |
| 13 | int event; |
| 14 | }; |
Al Viro | b2dba1a | 2011-11-23 19:26:23 -0500 | [diff] [blame] | 15 | |
Al Viro | 68e8a9f | 2011-11-24 22:53:09 -0500 | [diff] [blame] | 16 | struct mnt_pcp { |
| 17 | int mnt_count; |
| 18 | int mnt_writers; |
| 19 | }; |
| 20 | |
Al Viro | 84d1719 | 2013-03-15 10:53:28 -0400 | [diff] [blame] | 21 | struct mountpoint { |
| 22 | struct list_head m_hash; |
| 23 | struct dentry *m_dentry; |
| 24 | int m_count; |
| 25 | }; |
| 26 | |
Al Viro | 7d6fec4 | 2011-11-23 12:14:10 -0500 | [diff] [blame] | 27 | struct mount { |
Al Viro | 1b8e556 | 2011-11-24 21:01:32 -0500 | [diff] [blame] | 28 | struct list_head mnt_hash; |
Al Viro | 0714a53 | 2011-11-24 22:19:58 -0500 | [diff] [blame] | 29 | struct mount *mnt_parent; |
Al Viro | a73324d | 2011-11-24 22:25:07 -0500 | [diff] [blame] | 30 | struct dentry *mnt_mountpoint; |
Al Viro | 7d6fec4 | 2011-11-23 12:14:10 -0500 | [diff] [blame] | 31 | struct vfsmount mnt; |
Al Viro | 48a066e | 2013-09-29 22:06:07 -0400 | [diff] [blame] | 32 | struct rcu_head mnt_rcu; |
Al Viro | 68e8a9f | 2011-11-24 22:53:09 -0500 | [diff] [blame] | 33 | #ifdef CONFIG_SMP |
| 34 | struct mnt_pcp __percpu *mnt_pcp; |
Al Viro | 68e8a9f | 2011-11-24 22:53:09 -0500 | [diff] [blame] | 35 | #else |
| 36 | int mnt_count; |
| 37 | int mnt_writers; |
| 38 | #endif |
Al Viro | 6b41d53 | 2011-11-24 23:24:33 -0500 | [diff] [blame] | 39 | struct list_head mnt_mounts; /* list of children, anchored here */ |
| 40 | struct list_head mnt_child; /* and going through their mnt_child */ |
Miklos Szeredi | 39f7c4d | 2011-11-21 12:11:30 +0100 | [diff] [blame] | 41 | struct list_head mnt_instance; /* mount instance on sb->s_mounts */ |
Al Viro | 52ba162 | 2011-11-25 02:25:17 -0500 | [diff] [blame] | 42 | const char *mnt_devname; /* Name of device e.g. /dev/dsk/hda1 */ |
Al Viro | 1a4eeaf | 2011-11-25 02:19:55 -0500 | [diff] [blame] | 43 | struct list_head mnt_list; |
Al Viro | 6776db3d | 2011-11-25 00:22:05 -0500 | [diff] [blame] | 44 | struct list_head mnt_expire; /* link in fs-specific expiry list */ |
| 45 | struct list_head mnt_share; /* circular list of shared mounts */ |
| 46 | struct list_head mnt_slave_list;/* list of slave mounts */ |
| 47 | struct list_head mnt_slave; /* slave list entry */ |
Al Viro | 3230192 | 2011-11-25 00:10:28 -0500 | [diff] [blame] | 48 | struct mount *mnt_master; /* slave is on master->mnt_slave_list */ |
Al Viro | 143c8c9 | 2011-11-25 00:46:35 -0500 | [diff] [blame] | 49 | struct mnt_namespace *mnt_ns; /* containing namespace */ |
Al Viro | 84d1719 | 2013-03-15 10:53:28 -0400 | [diff] [blame] | 50 | struct mountpoint *mnt_mp; /* where is it mounted */ |
Al Viro | c63181e | 2011-11-25 02:35:16 -0500 | [diff] [blame] | 51 | #ifdef CONFIG_FSNOTIFY |
| 52 | struct hlist_head mnt_fsnotify_marks; |
| 53 | __u32 mnt_fsnotify_mask; |
| 54 | #endif |
Al Viro | 15169fe | 2011-11-25 00:50:41 -0500 | [diff] [blame] | 55 | int mnt_id; /* mount identifier */ |
| 56 | int mnt_group_id; /* peer group identifier */ |
Al Viro | 863d684 | 2011-11-25 00:57:42 -0500 | [diff] [blame] | 57 | int mnt_expiry_mark; /* true if marked for expiry */ |
| 58 | int mnt_pinned; |
Al Viro | aba809cf | 2013-09-28 23:10:55 -0400 | [diff] [blame] | 59 | struct path mnt_ex_mountpoint; |
Al Viro | 7d6fec4 | 2011-11-23 12:14:10 -0500 | [diff] [blame] | 60 | }; |
| 61 | |
Al Viro | f7a99c5 | 2012-06-09 00:59:08 -0400 | [diff] [blame] | 62 | #define MNT_NS_INTERNAL ERR_PTR(-EINVAL) /* distinct from any mnt_namespace */ |
| 63 | |
Al Viro | 7d6fec4 | 2011-11-23 12:14:10 -0500 | [diff] [blame] | 64 | static inline struct mount *real_mount(struct vfsmount *mnt) |
| 65 | { |
| 66 | return container_of(mnt, struct mount, mnt); |
| 67 | } |
| 68 | |
Al Viro | 676da58 | 2011-11-24 21:47:05 -0500 | [diff] [blame] | 69 | static inline int mnt_has_parent(struct mount *mnt) |
Al Viro | b2dba1a | 2011-11-23 19:26:23 -0500 | [diff] [blame] | 70 | { |
Al Viro | 0714a53 | 2011-11-24 22:19:58 -0500 | [diff] [blame] | 71 | return mnt != mnt->mnt_parent; |
Al Viro | b2dba1a | 2011-11-23 19:26:23 -0500 | [diff] [blame] | 72 | } |
Al Viro | c710536 | 2011-11-24 18:22:03 -0500 | [diff] [blame] | 73 | |
Al Viro | f7a99c5 | 2012-06-09 00:59:08 -0400 | [diff] [blame] | 74 | static inline int is_mounted(struct vfsmount *mnt) |
| 75 | { |
| 76 | /* neither detached nor internal? */ |
| 77 | return !IS_ERR_OR_NULL(real_mount(mnt)); |
| 78 | } |
| 79 | |
Al Viro | 474279d | 2013-10-01 16:11:26 -0400 | [diff] [blame] | 80 | extern struct mount *__lookup_mnt(struct vfsmount *, struct dentry *); |
| 81 | extern struct mount *__lookup_mnt_last(struct vfsmount *, struct dentry *); |
Al Viro | 0226f49 | 2011-12-06 12:21:54 -0500 | [diff] [blame] | 82 | |
Al Viro | 48a066e | 2013-09-29 22:06:07 -0400 | [diff] [blame] | 83 | extern bool legitimize_mnt(struct vfsmount *, unsigned); |
| 84 | |
Al Viro | 0226f49 | 2011-12-06 12:21:54 -0500 | [diff] [blame] | 85 | static inline void get_mnt_ns(struct mnt_namespace *ns) |
| 86 | { |
| 87 | atomic_inc(&ns->count); |
| 88 | } |
| 89 | |
Al Viro | 48a066e | 2013-09-29 22:06:07 -0400 | [diff] [blame] | 90 | extern seqlock_t mount_lock; |
Al Viro | 719ea2f | 2013-09-29 11:24:49 -0400 | [diff] [blame] | 91 | |
| 92 | static inline void lock_mount_hash(void) |
| 93 | { |
Al Viro | 48a066e | 2013-09-29 22:06:07 -0400 | [diff] [blame] | 94 | write_seqlock(&mount_lock); |
Al Viro | 719ea2f | 2013-09-29 11:24:49 -0400 | [diff] [blame] | 95 | } |
| 96 | |
| 97 | static inline void unlock_mount_hash(void) |
| 98 | { |
Al Viro | 48a066e | 2013-09-29 22:06:07 -0400 | [diff] [blame] | 99 | write_sequnlock(&mount_lock); |
Al Viro | 719ea2f | 2013-09-29 11:24:49 -0400 | [diff] [blame] | 100 | } |
| 101 | |
Al Viro | 0226f49 | 2011-12-06 12:21:54 -0500 | [diff] [blame] | 102 | struct proc_mounts { |
Al Viro | 6ce6e24 | 2012-06-09 01:16:59 -0400 | [diff] [blame] | 103 | struct seq_file m; |
Al Viro | 0226f49 | 2011-12-06 12:21:54 -0500 | [diff] [blame] | 104 | struct mnt_namespace *ns; |
| 105 | struct path root; |
| 106 | int (*show)(struct seq_file *, struct vfsmount *); |
| 107 | }; |
| 108 | |
Al Viro | 6ce6e24 | 2012-06-09 01:16:59 -0400 | [diff] [blame] | 109 | #define proc_mounts(p) (container_of((p), struct proc_mounts, m)) |
| 110 | |
Al Viro | 0226f49 | 2011-12-06 12:21:54 -0500 | [diff] [blame] | 111 | extern const struct seq_operations mounts_op; |