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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * | |
3 | * Definitions for mount interface. This describes the in the kernel build | |
4 | * linkedlist with mounted filesystems. | |
5 | * | |
6 | * Author: Marco van Wieringen <mvw@planets.elm.net> | |
7 | * | |
1da177e4 LT |
8 | */ |
9 | #ifndef _LINUX_MOUNT_H | |
10 | #define _LINUX_MOUNT_H | |
1da177e4 | 11 | |
d53d9f16 | 12 | #include <linux/types.h> |
1da177e4 | 13 | #include <linux/list.h> |
3d733633 | 14 | #include <linux/nodemask.h> |
1da177e4 LT |
15 | #include <linux/spinlock.h> |
16 | #include <asm/atomic.h> | |
17 | ||
726c3342 DH |
18 | struct super_block; |
19 | struct vfsmount; | |
20 | struct dentry; | |
6b3286ed | 21 | struct mnt_namespace; |
726c3342 | 22 | |
07b20889 RP |
23 | #define MNT_NOSUID 0x01 |
24 | #define MNT_NODEV 0x02 | |
25 | #define MNT_NOEXEC 0x04 | |
fc33a7bb CH |
26 | #define MNT_NOATIME 0x08 |
27 | #define MNT_NODIRATIME 0x10 | |
47ae32d6 | 28 | #define MNT_RELATIME 0x20 |
2e4b7fcd | 29 | #define MNT_READONLY 0x40 /* does the user want this to be r/o? */ |
bf066c7d | 30 | |
5528f911 | 31 | #define MNT_SHRINKABLE 0x100 |
d3ef3d73 | 32 | #define MNT_WRITE_HOLD 0x200 |
5528f911 | 33 | |
fc33a7bb CH |
34 | #define MNT_SHARED 0x1000 /* if the vfsmount is a shared mount */ |
35 | #define MNT_UNBINDABLE 0x2000 /* if the vfsmount is a unbindable mount */ | |
495d6c9c VA |
36 | /* |
37 | * MNT_SHARED_MASK is the set of flags that should be cleared when a | |
38 | * mount becomes shared. Currently, this is only the flag that says a | |
39 | * mount cannot be bind mounted, since this is how we create a mount | |
40 | * that shares events with another mount. If you add a new MNT_* | |
41 | * flag, consider how it interacts with shared mounts. | |
42 | */ | |
43 | #define MNT_SHARED_MASK (MNT_UNBINDABLE) | |
44 | #define MNT_PROPAGATION_MASK (MNT_SHARED | MNT_UNBINDABLE) | |
45 | ||
1da177e4 | 46 | |
8089352a | 47 | #define MNT_INTERNAL 0x4000 |
1da177e4 | 48 | |
07b20889 | 49 | struct vfsmount { |
1da177e4 LT |
50 | struct list_head mnt_hash; |
51 | struct vfsmount *mnt_parent; /* fs we are mounted on */ | |
52 | struct dentry *mnt_mountpoint; /* dentry of mountpoint */ | |
53 | struct dentry *mnt_root; /* root of the mounted tree */ | |
54 | struct super_block *mnt_sb; /* pointer to superblock */ | |
55 | struct list_head mnt_mounts; /* list of children, anchored here */ | |
56 | struct list_head mnt_child; /* and going through their mnt_child */ | |
1da177e4 | 57 | int mnt_flags; |
2504c5d6 AG |
58 | /* 4 bytes hole on 64bits arches without fsnotify */ |
59 | #ifdef CONFIG_FSNOTIFY | |
60 | __u32 mnt_fsnotify_mask; | |
61 | struct hlist_head mnt_fsnotify_marks; | |
62 | #endif | |
88b38782 | 63 | const char *mnt_devname; /* Name of device e.g. /dev/dsk/hda1 */ |
1da177e4 | 64 | struct list_head mnt_list; |
55e700b9 | 65 | struct list_head mnt_expire; /* link in fs-specific expiry list */ |
03e06e68 | 66 | struct list_head mnt_share; /* circular list of shared mounts */ |
a58b0eb8 RP |
67 | struct list_head mnt_slave_list;/* list of slave mounts */ |
68 | struct list_head mnt_slave; /* slave list entry */ | |
69 | struct vfsmount *mnt_master; /* slave is on master->mnt_slave_list */ | |
6b3286ed | 70 | struct mnt_namespace *mnt_ns; /* containing namespace */ |
73cd49ec | 71 | int mnt_id; /* mount identifier */ |
719f5d7f | 72 | int mnt_group_id; /* peer group identifier */ |
4ba4d4c0 ED |
73 | /* |
74 | * We put mnt_count & mnt_expiry_mark at the end of struct vfsmount | |
75 | * to let these frequently modified fields in a separate cache line | |
76 | * (so that reads of mnt_flags wont ping-pong on SMP machines) | |
77 | */ | |
78 | atomic_t mnt_count; | |
79 | int mnt_expiry_mark; /* true if marked for expiry */ | |
7b7b1ace | 80 | int mnt_pinned; |
7c4b93d8 | 81 | int mnt_ghosts; |
d3ef3d73 | 82 | #ifdef CONFIG_SMP |
003cb608 | 83 | int __percpu *mnt_writers; |
d3ef3d73 NP |
84 | #else |
85 | int mnt_writers; | |
86 | #endif | |
1da177e4 LT |
87 | }; |
88 | ||
d3ef3d73 NP |
89 | static inline int *get_mnt_writers_ptr(struct vfsmount *mnt) |
90 | { | |
91 | #ifdef CONFIG_SMP | |
92 | return mnt->mnt_writers; | |
93 | #else | |
94 | return &mnt->mnt_writers; | |
95 | #endif | |
96 | } | |
97 | ||
1da177e4 LT |
98 | static inline struct vfsmount *mntget(struct vfsmount *mnt) |
99 | { | |
100 | if (mnt) | |
101 | atomic_inc(&mnt->mnt_count); | |
102 | return mnt; | |
103 | } | |
104 | ||
96029c4e NP |
105 | struct file; /* forward dec */ |
106 | ||
8366025e | 107 | extern int mnt_want_write(struct vfsmount *mnt); |
96029c4e NP |
108 | extern int mnt_want_write_file(struct file *file); |
109 | extern int mnt_clone_write(struct vfsmount *mnt); | |
8366025e | 110 | extern void mnt_drop_write(struct vfsmount *mnt); |
7b7b1ace AV |
111 | extern void mntput_no_expire(struct vfsmount *mnt); |
112 | extern void mnt_pin(struct vfsmount *mnt); | |
113 | extern void mnt_unpin(struct vfsmount *mnt); | |
8366025e | 114 | extern int __mnt_is_readonly(struct vfsmount *mnt); |
1da177e4 LT |
115 | |
116 | static inline void mntput(struct vfsmount *mnt) | |
117 | { | |
118 | if (mnt) { | |
119 | mnt->mnt_expiry_mark = 0; | |
751c404b | 120 | mntput_no_expire(mnt); |
1da177e4 LT |
121 | } |
122 | } | |
123 | ||
1da177e4 LT |
124 | extern struct vfsmount *do_kern_mount(const char *fstype, int flags, |
125 | const char *name, void *data); | |
126 | ||
bb4a58bf TM |
127 | struct file_system_type; |
128 | extern struct vfsmount *vfs_kern_mount(struct file_system_type *type, | |
129 | int flags, const char *name, | |
130 | void *data); | |
131 | ||
1da177e4 LT |
132 | struct nameidata; |
133 | ||
8d66bf54 AV |
134 | struct path; |
135 | extern int do_add_mount(struct vfsmount *newmnt, struct path *path, | |
1da177e4 LT |
136 | int mnt_flags, struct list_head *fslist); |
137 | ||
138 | extern void mark_mounts_for_expiry(struct list_head *mounts); | |
139 | ||
d53d9f16 | 140 | extern dev_t name_to_dev_t(char *name); |
1da177e4 | 141 | |
1da177e4 | 142 | #endif /* _LINUX_MOUNT_H */ |