source: src/linux/universal/linux-4.9/fs/mount.h @ 31662

Last change on this file since 31662 was 31662, checked in by brainslayer, 4 months ago

use new squashfs in all kernels

File size: 3.5 KB
Line 
1#include <linux/mount.h>
2#include <linux/seq_file.h>
3#include <linux/poll.h>
4#include <linux/ns_common.h>
5#include <linux/fs_pin.h>
6
7struct mnt_namespace {
8        atomic_t                count;
9        struct ns_common        ns;
10        struct mount *  root;
11        struct list_head        list;
12        struct user_namespace   *user_ns;
13        struct ucounts          *ucounts;
14        u64                     seq;    /* Sequence number to prevent loops */
15        wait_queue_head_t poll;
16        u64 event;
17        unsigned int            mounts; /* # of mounts in the namespace */
18        unsigned int            pending_mounts;
19};
20
21struct mnt_pcp {
22        int mnt_count;
23        int mnt_writers;
24};
25
26struct mountpoint {
27        struct hlist_node m_hash;
28        struct dentry *m_dentry;
29        struct hlist_head m_list;
30        int m_count;
31};
32
33struct mount {
34        struct hlist_node mnt_hash;
35        struct mount *mnt_parent;
36        struct dentry *mnt_mountpoint;
37        struct vfsmount mnt;
38        union {
39                struct rcu_head mnt_rcu;
40                struct llist_node mnt_llist;
41        };
42#ifdef CONFIG_SMP
43        struct mnt_pcp __percpu *mnt_pcp;
44#else
45        int mnt_count;
46        int mnt_writers;
47#endif
48        struct list_head mnt_mounts;    /* list of children, anchored here */
49        struct list_head mnt_child;     /* and going through their mnt_child */
50        struct list_head mnt_instance;  /* mount instance on sb->s_mounts */
51        const char *mnt_devname;        /* Name of device e.g. /dev/dsk/hda1 */
52        struct list_head mnt_list;
53        struct list_head mnt_expire;    /* link in fs-specific expiry list */
54        struct list_head mnt_share;     /* circular list of shared mounts */
55        struct list_head mnt_slave_list;/* list of slave mounts */
56        struct list_head mnt_slave;     /* slave list entry */
57        struct mount *mnt_master;       /* slave is on master->mnt_slave_list */
58        struct mnt_namespace *mnt_ns;   /* containing namespace */
59        struct mountpoint *mnt_mp;      /* where is it mounted */
60        struct hlist_node mnt_mp_list;  /* list mounts with the same mountpoint */
61#ifdef CONFIG_FSNOTIFY
62        struct hlist_head mnt_fsnotify_marks;
63        __u32 mnt_fsnotify_mask;
64#endif
65        int mnt_id;                     /* mount identifier */
66        int mnt_group_id;               /* peer group identifier */
67        int mnt_expiry_mark;            /* true if marked for expiry */
68        struct hlist_head mnt_pins;
69        struct fs_pin mnt_umount;
70        struct dentry *mnt_ex_mountpoint;
71};
72
73#define MNT_NS_INTERNAL ERR_PTR(-EINVAL) /* distinct from any mnt_namespace */
74
75static inline struct mount *real_mount(struct vfsmount *mnt)
76{
77        return container_of(mnt, struct mount, mnt);
78}
79
80static inline int mnt_has_parent(struct mount *mnt)
81{
82        return mnt != mnt->mnt_parent;
83}
84
85static inline int is_mounted(struct vfsmount *mnt)
86{
87        /* neither detached nor internal? */
88        return !IS_ERR_OR_NULL(real_mount(mnt)->mnt_ns);
89}
90
91extern struct mount *__lookup_mnt(struct vfsmount *, struct dentry *);
92
93extern int __legitimize_mnt(struct vfsmount *, unsigned);
94extern bool legitimize_mnt(struct vfsmount *, unsigned);
95
96extern void __detach_mounts(struct dentry *dentry);
97
98static inline void detach_mounts(struct dentry *dentry)
99{
100        if (!d_mountpoint(dentry))
101                return;
102        __detach_mounts(dentry);
103}
104
105static inline void get_mnt_ns(struct mnt_namespace *ns)
106{
107        atomic_inc(&ns->count);
108}
109
110extern seqlock_t mount_lock;
111
112static inline void lock_mount_hash(void)
113{
114        write_seqlock(&mount_lock);
115}
116
117static inline void unlock_mount_hash(void)
118{
119        write_sequnlock(&mount_lock);
120}
121
122struct proc_mounts {
123        struct mnt_namespace *ns;
124        struct path root;
125        int (*show)(struct seq_file *, struct vfsmount *);
126        void *cached_mount;
127        u64 cached_event;
128        loff_t cached_index;
129};
130
131extern const struct seq_operations mounts_op;
132
133extern bool __is_local_mountpoint(struct dentry *dentry);
134static inline bool is_local_mountpoint(struct dentry *dentry)
135{
136        if (!d_mountpoint(dentry))
137                return false;
138
139        return __is_local_mountpoint(dentry);
140}
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