Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | /* |
3 | * | |
4 | * Definitions for mount interface. This describes the in the kernel build | |
5 | * linkedlist with mounted filesystems. | |
6 | * | |
7 | * Author: Marco van Wieringen <mvw@planets.elm.net> | |
8 | * | |
1da177e4 LT |
9 | */ |
10 | #ifndef _LINUX_MOUNT_H | |
11 | #define _LINUX_MOUNT_H | |
1da177e4 | 12 | |
d53d9f16 | 13 | #include <linux/types.h> |
59df85d5 | 14 | #include <asm/barrier.h> |
1da177e4 | 15 | |
726c3342 | 16 | struct super_block; |
726c3342 | 17 | struct dentry; |
59df85d5 | 18 | struct user_namespace; |
256c8aed | 19 | struct mnt_idmap; |
59df85d5 | 20 | struct file_system_type; |
8f291889 | 21 | struct fs_context; |
59df85d5 AV |
22 | struct file; |
23 | struct path; | |
726c3342 | 24 | |
07b20889 RP |
25 | #define MNT_NOSUID 0x01 |
26 | #define MNT_NODEV 0x02 | |
27 | #define MNT_NOEXEC 0x04 | |
fc33a7bb CH |
28 | #define MNT_NOATIME 0x08 |
29 | #define MNT_NODIRATIME 0x10 | |
47ae32d6 | 30 | #define MNT_RELATIME 0x20 |
2e4b7fcd | 31 | #define MNT_READONLY 0x40 /* does the user want this to be r/o? */ |
dab741e0 | 32 | #define MNT_NOSYMFOLLOW 0x80 |
bf066c7d | 33 | |
5528f911 | 34 | #define MNT_SHRINKABLE 0x100 |
d3ef3d73 | 35 | #define MNT_WRITE_HOLD 0x200 |
5528f911 | 36 | |
fc33a7bb CH |
37 | #define MNT_SHARED 0x1000 /* if the vfsmount is a shared mount */ |
38 | #define MNT_UNBINDABLE 0x2000 /* if the vfsmount is a unbindable mount */ | |
495d6c9c VA |
39 | /* |
40 | * MNT_SHARED_MASK is the set of flags that should be cleared when a | |
41 | * mount becomes shared. Currently, this is only the flag that says a | |
42 | * mount cannot be bind mounted, since this is how we create a mount | |
43 | * that shares events with another mount. If you add a new MNT_* | |
44 | * flag, consider how it interacts with shared mounts. | |
45 | */ | |
46 | #define MNT_SHARED_MASK (MNT_UNBINDABLE) | |
a6138db8 EB |
47 | #define MNT_USER_SETTABLE_MASK (MNT_NOSUID | MNT_NODEV | MNT_NOEXEC \ |
48 | | MNT_NOATIME | MNT_NODIRATIME | MNT_RELATIME \ | |
dab741e0 | 49 | | MNT_READONLY | MNT_NOSYMFOLLOW) |
9566d674 | 50 | #define MNT_ATIME_MASK (MNT_NOATIME | MNT_NODIRATIME | MNT_RELATIME ) |
495d6c9c | 51 | |
f2ebb3a9 | 52 | #define MNT_INTERNAL_FLAGS (MNT_SHARED | MNT_WRITE_HOLD | MNT_INTERNAL | \ |
9f6c61f9 MS |
53 | MNT_DOOMED | MNT_SYNC_UMOUNT | MNT_MARKED | \ |
54 | MNT_CURSOR) | |
1da177e4 | 55 | |
8089352a | 56 | #define MNT_INTERNAL 0x4000 |
1da177e4 | 57 | |
9566d674 EB |
58 | #define MNT_LOCK_ATIME 0x040000 |
59 | #define MNT_LOCK_NOEXEC 0x080000 | |
60 | #define MNT_LOCK_NOSUID 0x100000 | |
61 | #define MNT_LOCK_NODEV 0x200000 | |
90563b19 | 62 | #define MNT_LOCK_READONLY 0x400000 |
5ff9d8a6 | 63 | #define MNT_LOCKED 0x800000 |
48a066e7 AV |
64 | #define MNT_DOOMED 0x1000000 |
65 | #define MNT_SYNC_UMOUNT 0x2000000 | |
f2ebb3a9 | 66 | #define MNT_MARKED 0x4000000 |
590ce4bc | 67 | #define MNT_UMOUNT 0x8000000 |
9f6c61f9 | 68 | #define MNT_CURSOR 0x10000000 |
90563b19 | 69 | |
07b20889 | 70 | struct vfsmount { |
1da177e4 LT |
71 | struct dentry *mnt_root; /* root of the mounted tree */ |
72 | struct super_block *mnt_sb; /* pointer to superblock */ | |
1da177e4 | 73 | int mnt_flags; |
256c8aed | 74 | struct mnt_idmap *mnt_idmap; |
3859a271 | 75 | } __randomize_layout; |
1da177e4 | 76 | |
256c8aed | 77 | static inline struct mnt_idmap *mnt_idmap(const struct vfsmount *mnt) |
a6435940 | 78 | { |
9caccd41 | 79 | /* Pairs with smp_store_release() in do_idmap_mount(). */ |
256c8aed | 80 | return smp_load_acquire(&mnt->mnt_idmap); |
a6435940 CB |
81 | } |
82 | ||
8366025e | 83 | extern int mnt_want_write(struct vfsmount *mnt); |
96029c4e | 84 | extern int mnt_want_write_file(struct file *file); |
8366025e | 85 | extern void mnt_drop_write(struct vfsmount *mnt); |
2a79f17e | 86 | extern void mnt_drop_write_file(struct file *file); |
b3e19d92 NP |
87 | extern void mntput(struct vfsmount *mnt); |
88 | extern struct vfsmount *mntget(struct vfsmount *mnt); | |
da27f796 | 89 | extern void mnt_make_shortterm(struct vfsmount *mnt); |
ca71cf71 | 90 | extern struct vfsmount *mnt_clone_internal(const struct path *path); |
43f5e655 | 91 | extern bool __mnt_is_readonly(struct vfsmount *mnt); |
380cf5ba | 92 | extern bool mnt_may_suid(struct vfsmount *mnt); |
1da177e4 | 93 | |
ca71cf71 | 94 | extern struct vfsmount *clone_private_mount(const struct path *path); |
9419a319 AV |
95 | extern int __mnt_want_write(struct vfsmount *); |
96 | extern void __mnt_drop_write(struct vfsmount *); | |
c771d683 | 97 | |
8f291889 AV |
98 | extern struct vfsmount *fc_mount(struct fs_context *fc); |
99 | extern struct vfsmount *vfs_create_mount(struct fs_context *fc); | |
bb4a58bf TM |
100 | extern struct vfsmount *vfs_kern_mount(struct file_system_type *type, |
101 | int flags, const char *name, | |
102 | void *data); | |
93faccbb EB |
103 | extern struct vfsmount *vfs_submount(const struct dentry *mountpoint, |
104 | struct file_system_type *type, | |
105 | const char *name, void *data); | |
bb4a58bf | 106 | |
ea5b778a | 107 | extern void mnt_set_expiry(struct vfsmount *mnt, struct list_head *expiry_list); |
1da177e4 LT |
108 | extern void mark_mounts_for_expiry(struct list_head *mounts); |
109 | ||
e6e20a7a | 110 | extern dev_t name_to_dev_t(const char *name); |
c6609c0a IK |
111 | extern bool path_is_mountpoint(const struct path *path); |
112 | ||
70f8d9c5 AV |
113 | extern bool our_mnt(struct vfsmount *mnt); |
114 | ||
115 | extern struct vfsmount *kern_mount(struct file_system_type *); | |
116 | extern void kern_unmount(struct vfsmount *mnt); | |
117 | extern int may_umount_tree(struct vfsmount *); | |
118 | extern int may_umount(struct vfsmount *); | |
119 | extern long do_mount(const char *, const char __user *, | |
120 | const char *, unsigned long, void *); | |
121 | extern struct vfsmount *collect_mounts(const struct path *); | |
122 | extern void drop_collected_mounts(struct vfsmount *); | |
123 | extern int iterate_mounts(int (*)(struct vfsmount *, void *), void *, | |
124 | struct vfsmount *); | |
df820f8d MS |
125 | extern void kern_unmount_array(struct vfsmount *mnt[], unsigned int num); |
126 | ||
1da177e4 | 127 | #endif /* _LINUX_MOUNT_H */ |