source: src/linux/universal/linux-4.4/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: 3.4 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        u64                     seq;    /* Sequence number to prevent loops */
14        wait_queue_head_t poll;
15        u64 event;
16};
17
18struct mnt_pcp {
19        int mnt_count;
20        int mnt_writers;
21};
22
23struct mountpoint {
24        struct hlist_node m_hash;
25        struct dentry *m_dentry;
26        struct hlist_head m_list;
27        int m_count;
28};
29
30struct mount {
31        struct hlist_node mnt_hash;
32        struct mount *mnt_parent;
33        struct dentry *mnt_mountpoint;
34        struct vfsmount mnt;
35        union {
36                struct rcu_head mnt_rcu;
37                struct llist_node mnt_llist;
38        };
39#ifdef CONFIG_SMP
40        struct mnt_pcp __percpu *mnt_pcp;
41#else
42        int mnt_count;
43        int mnt_writers;
44#endif
45        struct list_head mnt_mounts;    /* list of children, anchored here */
46        struct list_head mnt_child;     /* and going through their mnt_child */
47        struct list_head mnt_instance;  /* mount instance on sb->s_mounts */
48        const char *mnt_devname;        /* Name of device e.g. /dev/dsk/hda1 */
49        struct list_head mnt_list;
50        struct list_head mnt_expire;    /* link in fs-specific expiry list */
51        struct list_head mnt_share;     /* circular list of shared mounts */
52        struct list_head mnt_slave_list;/* list of slave mounts */
53        struct list_head mnt_slave;     /* slave list entry */
54        struct mount *mnt_master;       /* slave is on master->mnt_slave_list */
55        struct mnt_namespace *mnt_ns;   /* containing namespace */
56        struct mountpoint *mnt_mp;      /* where is it mounted */
57        struct hlist_node mnt_mp_list;  /* list mounts with the same mountpoint */
58#ifdef CONFIG_FSNOTIFY
59        struct hlist_head mnt_fsnotify_marks;
60        __u32 mnt_fsnotify_mask;
61#endif
62        int mnt_id;                     /* mount identifier */
63        int mnt_group_id;               /* peer group identifier */
64        int mnt_expiry_mark;            /* true if marked for expiry */
65        struct hlist_head mnt_pins;
66        struct fs_pin mnt_umount;
67        struct dentry *mnt_ex_mountpoint;
68};
69
70#define MNT_NS_INTERNAL ERR_PTR(-EINVAL) /* distinct from any mnt_namespace */
71
72static inline struct mount *real_mount(struct vfsmount *mnt)
73{
74        return container_of(mnt, struct mount, mnt);
75}
76
77static inline int mnt_has_parent(struct mount *mnt)
78{
79        return mnt != mnt->mnt_parent;
80}
81
82static inline int is_mounted(struct vfsmount *mnt)
83{
84        /* neither detached nor internal? */
85        return !IS_ERR_OR_NULL(real_mount(mnt)->mnt_ns);
86}
87
88extern struct mount *__lookup_mnt(struct vfsmount *, struct dentry *);
89
90extern int __legitimize_mnt(struct vfsmount *, unsigned);
91extern bool legitimize_mnt(struct vfsmount *, unsigned);
92
93extern void __detach_mounts(struct dentry *dentry);
94
95static inline void detach_mounts(struct dentry *dentry)
96{
97        if (!d_mountpoint(dentry))
98                return;
99        __detach_mounts(dentry);
100}
101
102static inline void get_mnt_ns(struct mnt_namespace *ns)
103{
104        atomic_inc(&ns->count);
105}
106
107extern seqlock_t mount_lock;
108
109static inline void lock_mount_hash(void)
110{
111        write_seqlock(&mount_lock);
112}
113
114static inline void unlock_mount_hash(void)
115{
116        write_sequnlock(&mount_lock);
117}
118
119struct proc_mounts {
120        struct mnt_namespace *ns;
121        struct path root;
122        int (*show)(struct seq_file *, struct vfsmount *);
123        void *cached_mount;
124        u64 cached_event;
125        loff_t cached_index;
126};
127
128extern const struct seq_operations mounts_op;
129
130extern bool __is_local_mountpoint(struct dentry *dentry);
131static inline bool is_local_mountpoint(struct dentry *dentry)
132{
133        if (!d_mountpoint(dentry))
134                return false;
135
136        return __is_local_mountpoint(dentry);
137}
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