blob: 4f291f9de641ea2aca94f609daa7e865ae71fd58 [file] [log] [blame]
Al Virob2dba1a2011-11-23 19:26:23 -05001#include <linux/mount.h>
Al Viro0226f492011-12-06 12:21:54 -05002#include <linux/seq_file.h>
3#include <linux/poll.h>
4
5struct mnt_namespace {
6 atomic_t count;
Al Virobe08d6d2011-12-06 13:32:36 -05007 struct mount * root;
Al Viro0226f492011-12-06 12:21:54 -05008 struct list_head list;
9 wait_queue_head_t poll;
10 int event;
11};
Al Virob2dba1a2011-11-23 19:26:23 -050012
Al Viro68e8a9f2011-11-24 22:53:09 -050013struct mnt_pcp {
14 int mnt_count;
15 int mnt_writers;
16};
17
Al Viro7d6fec42011-11-23 12:14:10 -050018struct mount {
Al Viro1b8e5562011-11-24 21:01:32 -050019 struct list_head mnt_hash;
Al Viro0714a532011-11-24 22:19:58 -050020 struct mount *mnt_parent;
Al Viroa73324d2011-11-24 22:25:07 -050021 struct dentry *mnt_mountpoint;
Al Viro7d6fec42011-11-23 12:14:10 -050022 struct vfsmount mnt;
Al Viro68e8a9f2011-11-24 22:53:09 -050023#ifdef CONFIG_SMP
24 struct mnt_pcp __percpu *mnt_pcp;
Al Viro68e8a9f2011-11-24 22:53:09 -050025#else
26 int mnt_count;
27 int mnt_writers;
28#endif
Al Viro6b41d532011-11-24 23:24:33 -050029 struct list_head mnt_mounts; /* list of children, anchored here */
30 struct list_head mnt_child; /* and going through their mnt_child */
Miklos Szeredi39f7c4d2011-11-21 12:11:30 +010031 struct list_head mnt_instance; /* mount instance on sb->s_mounts */
Al Viro52ba1622011-11-25 02:25:17 -050032 const char *mnt_devname; /* Name of device e.g. /dev/dsk/hda1 */
Al Viro1a4eeaf2011-11-25 02:19:55 -050033 struct list_head mnt_list;
Al Viro6776db3d2011-11-25 00:22:05 -050034 struct list_head mnt_expire; /* link in fs-specific expiry list */
35 struct list_head mnt_share; /* circular list of shared mounts */
36 struct list_head mnt_slave_list;/* list of slave mounts */
37 struct list_head mnt_slave; /* slave list entry */
Al Viro32301922011-11-25 00:10:28 -050038 struct mount *mnt_master; /* slave is on master->mnt_slave_list */
Al Viro143c8c92011-11-25 00:46:35 -050039 struct mnt_namespace *mnt_ns; /* containing namespace */
Al Viroc63181e2011-11-25 02:35:16 -050040#ifdef CONFIG_FSNOTIFY
41 struct hlist_head mnt_fsnotify_marks;
42 __u32 mnt_fsnotify_mask;
43#endif
Al Viro15169fe2011-11-25 00:50:41 -050044 int mnt_id; /* mount identifier */
45 int mnt_group_id; /* peer group identifier */
Al Viro863d6842011-11-25 00:57:42 -050046 int mnt_expiry_mark; /* true if marked for expiry */
47 int mnt_pinned;
48 int mnt_ghosts;
Al Viro7d6fec42011-11-23 12:14:10 -050049};
50
Al Virof7a99c52012-06-09 00:59:08 -040051#define MNT_NS_INTERNAL ERR_PTR(-EINVAL) /* distinct from any mnt_namespace */
52
Al Viro7d6fec42011-11-23 12:14:10 -050053static inline struct mount *real_mount(struct vfsmount *mnt)
54{
55 return container_of(mnt, struct mount, mnt);
56}
57
Al Viro676da582011-11-24 21:47:05 -050058static inline int mnt_has_parent(struct mount *mnt)
Al Virob2dba1a2011-11-23 19:26:23 -050059{
Al Viro0714a532011-11-24 22:19:58 -050060 return mnt != mnt->mnt_parent;
Al Virob2dba1a2011-11-23 19:26:23 -050061}
Al Viroc7105362011-11-24 18:22:03 -050062
Al Virof7a99c52012-06-09 00:59:08 -040063static inline int is_mounted(struct vfsmount *mnt)
64{
65 /* neither detached nor internal? */
66 return !IS_ERR_OR_NULL(real_mount(mnt));
67}
68
Al Viroc7105362011-11-24 18:22:03 -050069extern struct mount *__lookup_mnt(struct vfsmount *, struct dentry *, int);
Al Viro0226f492011-12-06 12:21:54 -050070
71static inline void get_mnt_ns(struct mnt_namespace *ns)
72{
73 atomic_inc(&ns->count);
74}
75
76struct proc_mounts {
Al Viro6ce6e242012-06-09 01:16:59 -040077 struct seq_file m;
Al Viro0226f492011-12-06 12:21:54 -050078 struct mnt_namespace *ns;
79 struct path root;
80 int (*show)(struct seq_file *, struct vfsmount *);
81};
82
Al Viro6ce6e242012-06-09 01:16:59 -040083#define proc_mounts(p) (container_of((p), struct proc_mounts, m))
84
Al Viro0226f492011-12-06 12:21:54 -050085extern const struct seq_operations mounts_op;