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Merge tag 'gvt-fixes-2018-09-10' of https://github.com/intel/gvt-linux into drm-intel...
[mirror_ubuntu-eoan-kernel.git] / fs / mount.h
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b2441318 1/* SPDX-License-Identifier: GPL-2.0 */
b2dba1af 2#include <linux/mount.h>
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3#include <linux/seq_file.h>
4#include <linux/poll.h>
435d5f4b 5#include <linux/ns_common.h>
87b95ce0 6#include <linux/fs_pin.h>
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7
8struct mnt_namespace {
9 atomic_t count;
435d5f4b 10 struct ns_common ns;
be08d6d2 11 struct mount * root;
0226f492 12 struct list_head list;
771b1371 13 struct user_namespace *user_ns;
537f7ccb 14 struct ucounts *ucounts;
8823c079 15 u64 seq; /* Sequence number to prevent loops */
0226f492 16 wait_queue_head_t poll;
c7999c36 17 u64 event;
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18 unsigned int mounts; /* # of mounts in the namespace */
19 unsigned int pending_mounts;
3859a271 20} __randomize_layout;
b2dba1af 21
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22struct mnt_pcp {
23 int mnt_count;
24 int mnt_writers;
25};
26
84d17192 27struct mountpoint {
0818bf27 28 struct hlist_node m_hash;
84d17192 29 struct dentry *m_dentry;
0a5eb7c8 30 struct hlist_head m_list;
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31 int m_count;
32};
33
7d6fec45 34struct mount {
38129a13 35 struct hlist_node mnt_hash;
0714a533 36 struct mount *mnt_parent;
a73324da 37 struct dentry *mnt_mountpoint;
7d6fec45 38 struct vfsmount mnt;
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39 union {
40 struct rcu_head mnt_rcu;
41 struct llist_node mnt_llist;
42 };
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43#ifdef CONFIG_SMP
44 struct mnt_pcp __percpu *mnt_pcp;
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45#else
46 int mnt_count;
47 int mnt_writers;
48#endif
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49 struct list_head mnt_mounts; /* list of children, anchored here */
50 struct list_head mnt_child; /* and going through their mnt_child */
39f7c4db 51 struct list_head mnt_instance; /* mount instance on sb->s_mounts */
52ba1621 52 const char *mnt_devname; /* Name of device e.g. /dev/dsk/hda1 */
1a4eeaf2 53 struct list_head mnt_list;
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54 struct list_head mnt_expire; /* link in fs-specific expiry list */
55 struct list_head mnt_share; /* circular list of shared mounts */
56 struct list_head mnt_slave_list;/* list of slave mounts */
57 struct list_head mnt_slave; /* slave list entry */
32301920 58 struct mount *mnt_master; /* slave is on master->mnt_slave_list */
143c8c91 59 struct mnt_namespace *mnt_ns; /* containing namespace */
84d17192 60 struct mountpoint *mnt_mp; /* where is it mounted */
0a5eb7c8 61 struct hlist_node mnt_mp_list; /* list mounts with the same mountpoint */
99b19d16 62 struct list_head mnt_umounting; /* list entry for umount propagation */
c63181e6 63#ifdef CONFIG_FSNOTIFY
08991e83 64 struct fsnotify_mark_connector __rcu *mnt_fsnotify_marks;
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65 __u32 mnt_fsnotify_mask;
66#endif
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67 int mnt_id; /* mount identifier */
68 int mnt_group_id; /* peer group identifier */
863d684f 69 int mnt_expiry_mark; /* true if marked for expiry */
215752fc 70 struct hlist_head mnt_pins;
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71 struct fs_pin mnt_umount;
72 struct dentry *mnt_ex_mountpoint;
3859a271 73} __randomize_layout;
7d6fec45 74
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75#define MNT_NS_INTERNAL ERR_PTR(-EINVAL) /* distinct from any mnt_namespace */
76
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77static inline struct mount *real_mount(struct vfsmount *mnt)
78{
79 return container_of(mnt, struct mount, mnt);
80}
81
676da58d 82static inline int mnt_has_parent(struct mount *mnt)
b2dba1af 83{
0714a533 84 return mnt != mnt->mnt_parent;
b2dba1af 85}
c7105365 86
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87static inline int is_mounted(struct vfsmount *mnt)
88{
89 /* neither detached nor internal? */
260a459d 90 return !IS_ERR_OR_NULL(real_mount(mnt)->mnt_ns);
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91}
92
474279dc 93extern struct mount *__lookup_mnt(struct vfsmount *, struct dentry *);
0226f492 94
294d71ff 95extern int __legitimize_mnt(struct vfsmount *, unsigned);
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96extern bool legitimize_mnt(struct vfsmount *, unsigned);
97
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98static inline bool __path_is_mountpoint(const struct path *path)
99{
100 struct mount *m = __lookup_mnt(path->mnt, path->dentry);
101 return m && likely(!(m->mnt.mnt_flags & MNT_SYNC_UMOUNT));
102}
103
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104extern void __detach_mounts(struct dentry *dentry);
105
106static inline void detach_mounts(struct dentry *dentry)
107{
108 if (!d_mountpoint(dentry))
109 return;
110 __detach_mounts(dentry);
111}
112
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113static inline void get_mnt_ns(struct mnt_namespace *ns)
114{
115 atomic_inc(&ns->count);
116}
117
48a066e7 118extern seqlock_t mount_lock;
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119
120static inline void lock_mount_hash(void)
121{
48a066e7 122 write_seqlock(&mount_lock);
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123}
124
125static inline void unlock_mount_hash(void)
126{
48a066e7 127 write_sequnlock(&mount_lock);
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128}
129
0226f492 130struct proc_mounts {
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131 struct mnt_namespace *ns;
132 struct path root;
133 int (*show)(struct seq_file *, struct vfsmount *);
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134 void *cached_mount;
135 u64 cached_event;
136 loff_t cached_index;
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137};
138
139extern const struct seq_operations mounts_op;
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140
141extern bool __is_local_mountpoint(struct dentry *dentry);
142static inline bool is_local_mountpoint(struct dentry *dentry)
143{
144 if (!d_mountpoint(dentry))
145 return false;
146
147 return __is_local_mountpoint(dentry);
148}