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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> |
1da177e4 | 14 | #include <linux/list.h> |
3d733633 | 15 | #include <linux/nodemask.h> |
1da177e4 | 16 | #include <linux/spinlock.h> |
b3e19d92 | 17 | #include <linux/seqlock.h> |
60063497 | 18 | #include <linux/atomic.h> |
1da177e4 | 19 | |
726c3342 DH |
20 | struct super_block; |
21 | struct vfsmount; | |
22 | struct dentry; | |
6b3286ed | 23 | struct mnt_namespace; |
8f291889 | 24 | struct fs_context; |
726c3342 | 25 | |
07b20889 RP |
26 | #define MNT_NOSUID 0x01 |
27 | #define MNT_NODEV 0x02 | |
28 | #define MNT_NOEXEC 0x04 | |
fc33a7bb CH |
29 | #define MNT_NOATIME 0x08 |
30 | #define MNT_NODIRATIME 0x10 | |
47ae32d6 | 31 | #define MNT_RELATIME 0x20 |
2e4b7fcd | 32 | #define MNT_READONLY 0x40 /* does the user want this to be r/o? */ |
dab741e0 | 33 | #define MNT_NOSYMFOLLOW 0x80 |
bf066c7d | 34 | |
5528f911 | 35 | #define MNT_SHRINKABLE 0x100 |
d3ef3d73 | 36 | #define MNT_WRITE_HOLD 0x200 |
5528f911 | 37 | |
fc33a7bb CH |
38 | #define MNT_SHARED 0x1000 /* if the vfsmount is a shared mount */ |
39 | #define MNT_UNBINDABLE 0x2000 /* if the vfsmount is a unbindable mount */ | |
495d6c9c VA |
40 | /* |
41 | * MNT_SHARED_MASK is the set of flags that should be cleared when a | |
42 | * mount becomes shared. Currently, this is only the flag that says a | |
43 | * mount cannot be bind mounted, since this is how we create a mount | |
44 | * that shares events with another mount. If you add a new MNT_* | |
45 | * flag, consider how it interacts with shared mounts. | |
46 | */ | |
47 | #define MNT_SHARED_MASK (MNT_UNBINDABLE) | |
a6138db8 EB |
48 | #define MNT_USER_SETTABLE_MASK (MNT_NOSUID | MNT_NODEV | MNT_NOEXEC \ |
49 | | MNT_NOATIME | MNT_NODIRATIME | MNT_RELATIME \ | |
dab741e0 | 50 | | MNT_READONLY | MNT_NOSYMFOLLOW) |
9566d674 | 51 | #define MNT_ATIME_MASK (MNT_NOATIME | MNT_NODIRATIME | MNT_RELATIME ) |
495d6c9c | 52 | |
f2ebb3a9 | 53 | #define MNT_INTERNAL_FLAGS (MNT_SHARED | MNT_WRITE_HOLD | MNT_INTERNAL | \ |
9f6c61f9 MS |
54 | MNT_DOOMED | MNT_SYNC_UMOUNT | MNT_MARKED | \ |
55 | MNT_CURSOR) | |
1da177e4 | 56 | |
8089352a | 57 | #define MNT_INTERNAL 0x4000 |
1da177e4 | 58 | |
9566d674 EB |
59 | #define MNT_LOCK_ATIME 0x040000 |
60 | #define MNT_LOCK_NOEXEC 0x080000 | |
61 | #define MNT_LOCK_NOSUID 0x100000 | |
62 | #define MNT_LOCK_NODEV 0x200000 | |
90563b19 | 63 | #define MNT_LOCK_READONLY 0x400000 |
5ff9d8a6 | 64 | #define MNT_LOCKED 0x800000 |
48a066e7 AV |
65 | #define MNT_DOOMED 0x1000000 |
66 | #define MNT_SYNC_UMOUNT 0x2000000 | |
f2ebb3a9 | 67 | #define MNT_MARKED 0x4000000 |
590ce4bc | 68 | #define MNT_UMOUNT 0x8000000 |
9f6c61f9 | 69 | #define MNT_CURSOR 0x10000000 |
90563b19 | 70 | |
07b20889 | 71 | struct vfsmount { |
1da177e4 LT |
72 | struct dentry *mnt_root; /* root of the mounted tree */ |
73 | struct super_block *mnt_sb; /* pointer to superblock */ | |
1da177e4 | 74 | int mnt_flags; |
a6435940 | 75 | struct user_namespace *mnt_userns; |
3859a271 | 76 | } __randomize_layout; |
1da177e4 | 77 | |
a6435940 CB |
78 | static inline struct user_namespace *mnt_user_ns(const struct vfsmount *mnt) |
79 | { | |
9caccd41 CB |
80 | /* Pairs with smp_store_release() in do_idmap_mount(). */ |
81 | return smp_load_acquire(&mnt->mnt_userns); | |
a6435940 CB |
82 | } |
83 | ||
96029c4e | 84 | struct file; /* forward dec */ |
3064c356 | 85 | struct path; |
96029c4e | 86 | |
8366025e | 87 | extern int mnt_want_write(struct vfsmount *mnt); |
96029c4e | 88 | extern int mnt_want_write_file(struct file *file); |
8366025e | 89 | extern void mnt_drop_write(struct vfsmount *mnt); |
2a79f17e | 90 | extern void mnt_drop_write_file(struct file *file); |
b3e19d92 NP |
91 | extern void mntput(struct vfsmount *mnt); |
92 | extern struct vfsmount *mntget(struct vfsmount *mnt); | |
ca71cf71 | 93 | extern struct vfsmount *mnt_clone_internal(const struct path *path); |
43f5e655 | 94 | extern bool __mnt_is_readonly(struct vfsmount *mnt); |
380cf5ba | 95 | extern bool mnt_may_suid(struct vfsmount *mnt); |
1da177e4 | 96 | |
c771d683 | 97 | struct path; |
ca71cf71 | 98 | extern struct vfsmount *clone_private_mount(const struct path *path); |
9419a319 AV |
99 | extern int __mnt_want_write(struct vfsmount *); |
100 | extern void __mnt_drop_write(struct vfsmount *); | |
c771d683 | 101 | |
bb4a58bf | 102 | struct file_system_type; |
8f291889 AV |
103 | extern struct vfsmount *fc_mount(struct fs_context *fc); |
104 | extern struct vfsmount *vfs_create_mount(struct fs_context *fc); | |
bb4a58bf TM |
105 | extern struct vfsmount *vfs_kern_mount(struct file_system_type *type, |
106 | int flags, const char *name, | |
107 | void *data); | |
93faccbb EB |
108 | extern struct vfsmount *vfs_submount(const struct dentry *mountpoint, |
109 | struct file_system_type *type, | |
110 | const char *name, void *data); | |
bb4a58bf | 111 | |
ea5b778a | 112 | extern void mnt_set_expiry(struct vfsmount *mnt, struct list_head *expiry_list); |
1da177e4 LT |
113 | extern void mark_mounts_for_expiry(struct list_head *mounts); |
114 | ||
e6e20a7a | 115 | extern dev_t name_to_dev_t(const char *name); |
1da177e4 | 116 | |
d2921684 EB |
117 | extern unsigned int sysctl_mount_max; |
118 | ||
c6609c0a IK |
119 | extern bool path_is_mountpoint(const struct path *path); |
120 | ||
df820f8d MS |
121 | extern void kern_unmount_array(struct vfsmount *mnt[], unsigned int num); |
122 | ||
1da177e4 | 123 | #endif /* _LINUX_MOUNT_H */ |