Commit | Line | Data |
---|---|---|
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? */ |
d0adde57 | 30 | #define MNT_STRICTATIME 0x80 |
bf066c7d | 31 | |
5528f911 | 32 | #define MNT_SHRINKABLE 0x100 |
d3ef3d73 | 33 | #define MNT_WRITE_HOLD 0x200 |
5528f911 | 34 | |
fc33a7bb CH |
35 | #define MNT_SHARED 0x1000 /* if the vfsmount is a shared mount */ |
36 | #define MNT_UNBINDABLE 0x2000 /* if the vfsmount is a unbindable mount */ | |
beb7dd86 | 37 | #define MNT_PNODE_MASK 0x3000 /* propagation flag mask */ |
1da177e4 | 38 | |
07b20889 | 39 | struct vfsmount { |
1da177e4 LT |
40 | struct list_head mnt_hash; |
41 | struct vfsmount *mnt_parent; /* fs we are mounted on */ | |
42 | struct dentry *mnt_mountpoint; /* dentry of mountpoint */ | |
43 | struct dentry *mnt_root; /* root of the mounted tree */ | |
44 | struct super_block *mnt_sb; /* pointer to superblock */ | |
45 | struct list_head mnt_mounts; /* list of children, anchored here */ | |
46 | struct list_head mnt_child; /* and going through their mnt_child */ | |
1da177e4 | 47 | int mnt_flags; |
4ba4d4c0 | 48 | /* 4 bytes hole on 64bits arches */ |
88b38782 | 49 | const char *mnt_devname; /* Name of device e.g. /dev/dsk/hda1 */ |
1da177e4 | 50 | struct list_head mnt_list; |
55e700b9 | 51 | struct list_head mnt_expire; /* link in fs-specific expiry list */ |
03e06e68 | 52 | struct list_head mnt_share; /* circular list of shared mounts */ |
a58b0eb8 RP |
53 | struct list_head mnt_slave_list;/* list of slave mounts */ |
54 | struct list_head mnt_slave; /* slave list entry */ | |
55 | struct vfsmount *mnt_master; /* slave is on master->mnt_slave_list */ | |
6b3286ed | 56 | struct mnt_namespace *mnt_ns; /* containing namespace */ |
73cd49ec | 57 | int mnt_id; /* mount identifier */ |
719f5d7f | 58 | int mnt_group_id; /* peer group identifier */ |
4ba4d4c0 ED |
59 | /* |
60 | * We put mnt_count & mnt_expiry_mark at the end of struct vfsmount | |
61 | * to let these frequently modified fields in a separate cache line | |
62 | * (so that reads of mnt_flags wont ping-pong on SMP machines) | |
63 | */ | |
64 | atomic_t mnt_count; | |
65 | int mnt_expiry_mark; /* true if marked for expiry */ | |
7b7b1ace | 66 | int mnt_pinned; |
7c4b93d8 | 67 | int mnt_ghosts; |
d3ef3d73 | 68 | #ifdef CONFIG_SMP |
69 | int *mnt_writers; | |
70 | #else | |
71 | int mnt_writers; | |
72 | #endif | |
1da177e4 LT |
73 | }; |
74 | ||
d3ef3d73 | 75 | static inline int *get_mnt_writers_ptr(struct vfsmount *mnt) |
76 | { | |
77 | #ifdef CONFIG_SMP | |
78 | return mnt->mnt_writers; | |
79 | #else | |
80 | return &mnt->mnt_writers; | |
81 | #endif | |
82 | } | |
83 | ||
1da177e4 LT |
84 | static inline struct vfsmount *mntget(struct vfsmount *mnt) |
85 | { | |
86 | if (mnt) | |
87 | atomic_inc(&mnt->mnt_count); | |
88 | return mnt; | |
89 | } | |
90 | ||
96029c4e | 91 | struct file; /* forward dec */ |
92 | ||
8366025e | 93 | extern int mnt_want_write(struct vfsmount *mnt); |
96029c4e | 94 | extern int mnt_want_write_file(struct file *file); |
95 | extern int mnt_clone_write(struct vfsmount *mnt); | |
8366025e | 96 | extern void mnt_drop_write(struct vfsmount *mnt); |
7b7b1ace AV |
97 | extern void mntput_no_expire(struct vfsmount *mnt); |
98 | extern void mnt_pin(struct vfsmount *mnt); | |
99 | extern void mnt_unpin(struct vfsmount *mnt); | |
8366025e | 100 | extern int __mnt_is_readonly(struct vfsmount *mnt); |
1da177e4 LT |
101 | |
102 | static inline void mntput(struct vfsmount *mnt) | |
103 | { | |
104 | if (mnt) { | |
105 | mnt->mnt_expiry_mark = 0; | |
751c404b | 106 | mntput_no_expire(mnt); |
1da177e4 LT |
107 | } |
108 | } | |
109 | ||
1da177e4 LT |
110 | extern struct vfsmount *do_kern_mount(const char *fstype, int flags, |
111 | const char *name, void *data); | |
112 | ||
bb4a58bf TM |
113 | struct file_system_type; |
114 | extern struct vfsmount *vfs_kern_mount(struct file_system_type *type, | |
115 | int flags, const char *name, | |
116 | void *data); | |
117 | ||
1da177e4 LT |
118 | struct nameidata; |
119 | ||
8d66bf54 AV |
120 | struct path; |
121 | extern int do_add_mount(struct vfsmount *newmnt, struct path *path, | |
1da177e4 LT |
122 | int mnt_flags, struct list_head *fslist); |
123 | ||
124 | extern void mark_mounts_for_expiry(struct list_head *mounts); | |
125 | ||
126 | extern spinlock_t vfsmount_lock; | |
d53d9f16 | 127 | extern dev_t name_to_dev_t(char *name); |
1da177e4 | 128 | |
1da177e4 | 129 | #endif /* _LINUX_MOUNT_H */ |