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TOMOYO Linux Cross Reference
Linux/fs/mount.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #include <linux/mount.h>
  3 #include <linux/seq_file.h>
  4 #include <linux/poll.h>
  5 #include <linux/ns_common.h>
  6 #include <linux/fs_pin.h>
  7 
  8 struct mnt_namespace {
  9         atomic_t                count;
 10         struct ns_common        ns;
 11         struct mount *  root;
 12         /*
 13          * Traversal and modification of .list is protected by either
 14          * - taking namespace_sem for write, OR
 15          * - taking namespace_sem for read AND taking .ns_lock.
 16          */
 17         struct list_head        list;
 18         spinlock_t              ns_lock;
 19         struct user_namespace   *user_ns;
 20         struct ucounts          *ucounts;
 21         u64                     seq;    /* Sequence number to prevent loops */
 22         wait_queue_head_t poll;
 23         u64 event;
 24         unsigned int            mounts; /* # of mounts in the namespace */
 25         unsigned int            pending_mounts;
 26 } __randomize_layout;
 27 
 28 struct mnt_pcp {
 29         int mnt_count;
 30         int mnt_writers;
 31 };
 32 
 33 struct mountpoint {
 34         struct hlist_node m_hash;
 35         struct dentry *m_dentry;
 36         struct hlist_head m_list;
 37         int m_count;
 38 };
 39 
 40 struct mount {
 41         struct hlist_node mnt_hash;
 42         struct mount *mnt_parent;
 43         struct dentry *mnt_mountpoint;
 44         struct vfsmount mnt;
 45         union {
 46                 struct rcu_head mnt_rcu;
 47                 struct llist_node mnt_llist;
 48         };
 49 #ifdef CONFIG_SMP
 50         struct mnt_pcp __percpu *mnt_pcp;
 51 #else
 52         int mnt_count;
 53         int mnt_writers;
 54 #endif
 55         struct list_head mnt_mounts;    /* list of children, anchored here */
 56         struct list_head mnt_child;     /* and going through their mnt_child */
 57         struct list_head mnt_instance;  /* mount instance on sb->s_mounts */
 58         const char *mnt_devname;        /* Name of device e.g. /dev/dsk/hda1 */
 59         struct list_head mnt_list;
 60         struct list_head mnt_expire;    /* link in fs-specific expiry list */
 61         struct list_head mnt_share;     /* circular list of shared mounts */
 62         struct list_head mnt_slave_list;/* list of slave mounts */
 63         struct list_head mnt_slave;     /* slave list entry */
 64         struct mount *mnt_master;       /* slave is on master->mnt_slave_list */
 65         struct mnt_namespace *mnt_ns;   /* containing namespace */
 66         struct mountpoint *mnt_mp;      /* where is it mounted */
 67         union {
 68                 struct hlist_node mnt_mp_list;  /* list mounts with the same mountpoint */
 69                 struct hlist_node mnt_umount;
 70         };
 71         struct list_head mnt_umounting; /* list entry for umount propagation */
 72 #ifdef CONFIG_FSNOTIFY
 73         struct fsnotify_mark_connector __rcu *mnt_fsnotify_marks;
 74         __u32 mnt_fsnotify_mask;
 75 #endif
 76         int mnt_id;                     /* mount identifier */
 77         int mnt_group_id;               /* peer group identifier */
 78         int mnt_expiry_mark;            /* true if marked for expiry */
 79         struct hlist_head mnt_pins;
 80         struct hlist_head mnt_stuck_children;
 81 } __randomize_layout;
 82 
 83 #define MNT_NS_INTERNAL ERR_PTR(-EINVAL) /* distinct from any mnt_namespace */
 84 
 85 static inline struct mount *real_mount(struct vfsmount *mnt)
 86 {
 87         return container_of(mnt, struct mount, mnt);
 88 }
 89 
 90 static inline int mnt_has_parent(struct mount *mnt)
 91 {
 92         return mnt != mnt->mnt_parent;
 93 }
 94 
 95 static inline int is_mounted(struct vfsmount *mnt)
 96 {
 97         /* neither detached nor internal? */
 98         return !IS_ERR_OR_NULL(real_mount(mnt)->mnt_ns);
 99 }
100 
101 extern struct mount *__lookup_mnt(struct vfsmount *, struct dentry *);
102 
103 extern int __legitimize_mnt(struct vfsmount *, unsigned);
104 extern bool legitimize_mnt(struct vfsmount *, unsigned);
105 
106 static inline bool __path_is_mountpoint(const struct path *path)
107 {
108         struct mount *m = __lookup_mnt(path->mnt, path->dentry);
109         return m && likely(!(m->mnt.mnt_flags & MNT_SYNC_UMOUNT));
110 }
111 
112 extern void __detach_mounts(struct dentry *dentry);
113 
114 static inline void detach_mounts(struct dentry *dentry)
115 {
116         if (!d_mountpoint(dentry))
117                 return;
118         __detach_mounts(dentry);
119 }
120 
121 static inline void get_mnt_ns(struct mnt_namespace *ns)
122 {
123         atomic_inc(&ns->count);
124 }
125 
126 extern seqlock_t mount_lock;
127 
128 static inline void lock_mount_hash(void)
129 {
130         write_seqlock(&mount_lock);
131 }
132 
133 static inline void unlock_mount_hash(void)
134 {
135         write_sequnlock(&mount_lock);
136 }
137 
138 struct proc_mounts {
139         struct mnt_namespace *ns;
140         struct path root;
141         int (*show)(struct seq_file *, struct vfsmount *);
142         struct mount cursor;
143 };
144 
145 extern const struct seq_operations mounts_op;
146 
147 extern bool __is_local_mountpoint(struct dentry *dentry);
148 static inline bool is_local_mountpoint(struct dentry *dentry)
149 {
150         if (!d_mountpoint(dentry))
151                 return false;
152 
153         return __is_local_mountpoint(dentry);
154 }
155 
156 static inline bool is_anon_ns(struct mnt_namespace *ns)
157 {
158         return ns->seq == 0;
159 }
160 
161 extern void mnt_cursor_del(struct mnt_namespace *ns, struct mount *cursor);
162 

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