2011-11-24 07:26:23 +07:00
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#include <linux/mount.h>
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2011-12-07 00:21:54 +07:00
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#include <linux/seq_file.h>
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#include <linux/poll.h>
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2014-11-01 09:56:04 +07:00
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#include <linux/ns_common.h>
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2015-01-11 07:01:08 +07:00
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#include <linux/fs_pin.h>
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2011-12-07 00:21:54 +07:00
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struct mnt_namespace {
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atomic_t count;
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2014-11-01 09:56:04 +07:00
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struct ns_common ns;
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2011-12-07 01:32:36 +07:00
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struct mount * root;
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2011-12-07 00:21:54 +07:00
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struct list_head list;
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2012-07-27 11:08:32 +07:00
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struct user_namespace *user_ns;
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2016-08-09 02:37:37 +07:00
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struct ucounts *ucounts;
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2010-03-08 09:49:36 +07:00
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u64 seq; /* Sequence number to prevent loops */
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2011-12-07 00:21:54 +07:00
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wait_queue_head_t poll;
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2014-02-28 02:40:10 +07:00
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u64 event;
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2016-09-28 12:27:17 +07:00
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unsigned int mounts; /* # of mounts in the namespace */
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unsigned int pending_mounts;
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2011-12-07 00:21:54 +07:00
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};
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2011-11-24 07:26:23 +07:00
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2011-11-25 10:53:09 +07:00
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struct mnt_pcp {
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int mnt_count;
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int mnt_writers;
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};
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2013-03-15 21:53:28 +07:00
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struct mountpoint {
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2014-03-01 01:46:44 +07:00
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struct hlist_node m_hash;
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2013-03-15 21:53:28 +07:00
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struct dentry *m_dentry;
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2013-09-23 09:37:01 +07:00
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struct hlist_head m_list;
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2013-03-15 21:53:28 +07:00
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int m_count;
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};
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2011-11-24 00:14:10 +07:00
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struct mount {
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2014-03-21 08:10:51 +07:00
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struct hlist_node mnt_hash;
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2011-11-25 10:19:58 +07:00
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struct mount *mnt_parent;
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2011-11-25 10:25:07 +07:00
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struct dentry *mnt_mountpoint;
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2011-11-24 00:14:10 +07:00
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struct vfsmount mnt;
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2014-08-09 00:08:20 +07:00
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union {
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struct rcu_head mnt_rcu;
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struct llist_node mnt_llist;
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};
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2011-11-25 10:53:09 +07:00
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#ifdef CONFIG_SMP
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struct mnt_pcp __percpu *mnt_pcp;
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#else
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int mnt_count;
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int mnt_writers;
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#endif
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2011-11-25 11:24:33 +07:00
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struct list_head mnt_mounts; /* list of children, anchored here */
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struct list_head mnt_child; /* and going through their mnt_child */
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2011-11-21 18:11:30 +07:00
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struct list_head mnt_instance; /* mount instance on sb->s_mounts */
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2011-11-25 14:25:17 +07:00
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const char *mnt_devname; /* Name of device e.g. /dev/dsk/hda1 */
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2011-11-25 14:19:55 +07:00
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struct list_head mnt_list;
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2011-11-25 12:22:05 +07:00
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struct list_head mnt_expire; /* link in fs-specific expiry list */
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struct list_head mnt_share; /* circular list of shared mounts */
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struct list_head mnt_slave_list;/* list of slave mounts */
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struct list_head mnt_slave; /* slave list entry */
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2011-11-25 12:10:28 +07:00
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struct mount *mnt_master; /* slave is on master->mnt_slave_list */
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2011-11-25 12:46:35 +07:00
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struct mnt_namespace *mnt_ns; /* containing namespace */
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2013-03-15 21:53:28 +07:00
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struct mountpoint *mnt_mp; /* where is it mounted */
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2013-09-23 09:37:01 +07:00
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struct hlist_node mnt_mp_list; /* list mounts with the same mountpoint */
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2011-11-25 14:35:16 +07:00
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#ifdef CONFIG_FSNOTIFY
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struct hlist_head mnt_fsnotify_marks;
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__u32 mnt_fsnotify_mask;
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#endif
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2011-11-25 12:50:41 +07:00
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int mnt_id; /* mount identifier */
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int mnt_group_id; /* peer group identifier */
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2011-11-25 12:57:42 +07:00
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int mnt_expiry_mark; /* true if marked for expiry */
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2014-08-07 17:23:41 +07:00
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struct hlist_head mnt_pins;
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2015-01-11 07:01:08 +07:00
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struct fs_pin mnt_umount;
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struct dentry *mnt_ex_mountpoint;
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2011-11-24 00:14:10 +07:00
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};
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2012-06-09 11:59:08 +07:00
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#define MNT_NS_INTERNAL ERR_PTR(-EINVAL) /* distinct from any mnt_namespace */
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2011-11-24 00:14:10 +07:00
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static inline struct mount *real_mount(struct vfsmount *mnt)
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{
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return container_of(mnt, struct mount, mnt);
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}
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2011-11-25 09:47:05 +07:00
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static inline int mnt_has_parent(struct mount *mnt)
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2011-11-24 07:26:23 +07:00
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{
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2011-11-25 10:19:58 +07:00
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return mnt != mnt->mnt_parent;
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2011-11-24 07:26:23 +07:00
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}
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2011-11-25 06:22:03 +07:00
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2012-06-09 11:59:08 +07:00
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static inline int is_mounted(struct vfsmount *mnt)
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{
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/* neither detached nor internal? */
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2014-01-21 06:26:15 +07:00
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return !IS_ERR_OR_NULL(real_mount(mnt)->mnt_ns);
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2012-06-09 11:59:08 +07:00
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}
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2013-10-02 03:11:26 +07:00
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extern struct mount *__lookup_mnt(struct vfsmount *, struct dentry *);
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extern struct mount *__lookup_mnt_last(struct vfsmount *, struct dentry *);
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2011-12-07 00:21:54 +07:00
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2015-05-08 22:43:53 +07:00
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extern int __legitimize_mnt(struct vfsmount *, unsigned);
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2013-09-30 09:06:07 +07:00
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extern bool legitimize_mnt(struct vfsmount *, unsigned);
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2013-10-03 15:31:18 +07:00
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extern void __detach_mounts(struct dentry *dentry);
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static inline void detach_mounts(struct dentry *dentry)
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{
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if (!d_mountpoint(dentry))
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return;
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__detach_mounts(dentry);
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}
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2011-12-07 00:21:54 +07:00
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static inline void get_mnt_ns(struct mnt_namespace *ns)
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{
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atomic_inc(&ns->count);
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}
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2013-09-30 09:06:07 +07:00
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extern seqlock_t mount_lock;
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2013-09-29 22:24:49 +07:00
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static inline void lock_mount_hash(void)
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{
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2013-09-30 09:06:07 +07:00
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write_seqlock(&mount_lock);
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2013-09-29 22:24:49 +07:00
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}
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static inline void unlock_mount_hash(void)
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{
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2013-09-30 09:06:07 +07:00
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write_sequnlock(&mount_lock);
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2013-09-29 22:24:49 +07:00
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}
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2011-12-07 00:21:54 +07:00
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struct proc_mounts {
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struct mnt_namespace *ns;
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struct path root;
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int (*show)(struct seq_file *, struct vfsmount *);
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2014-02-28 02:40:10 +07:00
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void *cached_mount;
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u64 cached_event;
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loff_t cached_index;
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2011-12-07 00:21:54 +07:00
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};
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extern const struct seq_operations mounts_op;
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2013-10-05 09:15:13 +07:00
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extern bool __is_local_mountpoint(struct dentry *dentry);
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static inline bool is_local_mountpoint(struct dentry *dentry)
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{
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if (!d_mountpoint(dentry))
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return false;
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return __is_local_mountpoint(dentry);
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}
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