Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | */ |
| 10 | #ifndef _LINUX_MOUNT_H |
| 11 | #define _LINUX_MOUNT_H |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | |
Andrew Morton | d53d9f1 | 2005-07-12 13:58:07 -0700 | [diff] [blame] | 13 | #include <linux/types.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/list.h> |
Dave Hansen | 3d73363 | 2008-02-15 14:37:59 -0800 | [diff] [blame] | 15 | #include <linux/nodemask.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <linux/spinlock.h> |
Nick Piggin | b3e19d9 | 2011-01-07 17:50:11 +1100 | [diff] [blame] | 17 | #include <linux/seqlock.h> |
Arun Sharma | 60063497 | 2011-07-26 16:09:06 -0700 | [diff] [blame] | 18 | #include <linux/atomic.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 20 | struct super_block; |
| 21 | struct vfsmount; |
| 22 | struct dentry; |
Kirill Korotaev | 6b3286e | 2006-12-08 02:37:56 -0800 | [diff] [blame] | 23 | struct mnt_namespace; |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 24 | |
Ram Pai | 07b2088 | 2005-11-07 17:19:07 -0500 | [diff] [blame] | 25 | #define MNT_NOSUID 0x01 |
| 26 | #define MNT_NODEV 0x02 |
| 27 | #define MNT_NOEXEC 0x04 |
Christoph Hellwig | fc33a7b | 2006-01-09 20:52:17 -0800 | [diff] [blame] | 28 | #define MNT_NOATIME 0x08 |
| 29 | #define MNT_NODIRATIME 0x10 |
Valerie Henson | 47ae32d | 2006-12-13 00:34:34 -0800 | [diff] [blame] | 30 | #define MNT_RELATIME 0x20 |
Dave Hansen | 2e4b7fc | 2008-02-15 14:38:00 -0800 | [diff] [blame] | 31 | #define MNT_READONLY 0x40 /* does the user want this to be r/o? */ |
Miklos Szeredi | bf066c7 | 2006-01-08 01:03:19 -0800 | [diff] [blame] | 32 | |
Trond Myklebust | 5528f911 | 2006-06-09 09:34:17 -0400 | [diff] [blame] | 33 | #define MNT_SHRINKABLE 0x100 |
npiggin@suse.de | d3ef3d7 | 2009-04-26 20:25:54 +1000 | [diff] [blame] | 34 | #define MNT_WRITE_HOLD 0x200 |
Trond Myklebust | 5528f911 | 2006-06-09 09:34:17 -0400 | [diff] [blame] | 35 | |
Christoph Hellwig | fc33a7b | 2006-01-09 20:52:17 -0800 | [diff] [blame] | 36 | #define MNT_SHARED 0x1000 /* if the vfsmount is a shared mount */ |
| 37 | #define MNT_UNBINDABLE 0x2000 /* if the vfsmount is a unbindable mount */ |
Valerie Aurora | 495d6c9 | 2010-01-26 14:20:47 -0500 | [diff] [blame] | 38 | /* |
| 39 | * MNT_SHARED_MASK is the set of flags that should be cleared when a |
| 40 | * mount becomes shared. Currently, this is only the flag that says a |
| 41 | * mount cannot be bind mounted, since this is how we create a mount |
| 42 | * that shares events with another mount. If you add a new MNT_* |
| 43 | * flag, consider how it interacts with shared mounts. |
| 44 | */ |
| 45 | #define MNT_SHARED_MASK (MNT_UNBINDABLE) |
Eric W. Biederman | a6138db | 2014-07-28 16:26:53 -0700 | [diff] [blame] | 46 | #define MNT_USER_SETTABLE_MASK (MNT_NOSUID | MNT_NODEV | MNT_NOEXEC \ |
| 47 | | MNT_NOATIME | MNT_NODIRATIME | MNT_RELATIME \ |
| 48 | | MNT_READONLY) |
Eric W. Biederman | 9566d67 | 2014-07-28 17:26:07 -0700 | [diff] [blame] | 49 | #define MNT_ATIME_MASK (MNT_NOATIME | MNT_NODIRATIME | MNT_RELATIME ) |
Valerie Aurora | 495d6c9 | 2010-01-26 14:20:47 -0500 | [diff] [blame] | 50 | |
Al Viro | f2ebb3a | 2014-02-27 09:35:45 -0500 | [diff] [blame] | 51 | #define MNT_INTERNAL_FLAGS (MNT_SHARED | MNT_WRITE_HOLD | MNT_INTERNAL | \ |
| 52 | MNT_DOOMED | MNT_SYNC_UMOUNT | MNT_MARKED) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | |
Al Viro | 8089352 | 2010-02-05 09:30:46 -0500 | [diff] [blame] | 54 | #define MNT_INTERNAL 0x4000 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | |
Eric W. Biederman | 9566d67 | 2014-07-28 17:26:07 -0700 | [diff] [blame] | 56 | #define MNT_LOCK_ATIME 0x040000 |
| 57 | #define MNT_LOCK_NOEXEC 0x080000 |
| 58 | #define MNT_LOCK_NOSUID 0x100000 |
| 59 | #define MNT_LOCK_NODEV 0x200000 |
Eric W. Biederman | 90563b1 | 2013-03-22 03:10:15 -0700 | [diff] [blame] | 60 | #define MNT_LOCK_READONLY 0x400000 |
Eric W. Biederman | 5ff9d8a | 2013-03-29 21:04:39 -0700 | [diff] [blame] | 61 | #define MNT_LOCKED 0x800000 |
Al Viro | 48a066e | 2013-09-29 22:06:07 -0400 | [diff] [blame] | 62 | #define MNT_DOOMED 0x1000000 |
| 63 | #define MNT_SYNC_UMOUNT 0x2000000 |
Al Viro | f2ebb3a | 2014-02-27 09:35:45 -0500 | [diff] [blame] | 64 | #define MNT_MARKED 0x4000000 |
Eric W. Biederman | 590ce4b | 2014-12-22 18:30:08 -0600 | [diff] [blame] | 65 | #define MNT_UMOUNT 0x8000000 |
Eric W. Biederman | 90563b1 | 2013-03-22 03:10:15 -0700 | [diff] [blame] | 66 | |
Ram Pai | 07b2088 | 2005-11-07 17:19:07 -0500 | [diff] [blame] | 67 | struct vfsmount { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | struct dentry *mnt_root; /* root of the mounted tree */ |
| 69 | struct super_block *mnt_sb; /* pointer to superblock */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | int mnt_flags; |
Daniel Rosenberg | 00fdd65 | 2016-10-26 15:29:51 -0700 | [diff] [blame] | 71 | void *data; |
Kees Cook | 3859a27 | 2016-10-28 01:22:25 -0700 | [diff] [blame] | 72 | } __randomize_layout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | |
npiggin@suse.de | 96029c4 | 2009-04-26 20:25:55 +1000 | [diff] [blame] | 74 | struct file; /* forward dec */ |
Al Viro | 3064c35 | 2014-08-07 09:12:31 -0400 | [diff] [blame] | 75 | struct path; |
npiggin@suse.de | 96029c4 | 2009-04-26 20:25:55 +1000 | [diff] [blame] | 76 | |
Dave Hansen | 8366025 | 2008-02-15 14:37:30 -0800 | [diff] [blame] | 77 | extern int mnt_want_write(struct vfsmount *mnt); |
npiggin@suse.de | 96029c4 | 2009-04-26 20:25:55 +1000 | [diff] [blame] | 78 | extern int mnt_want_write_file(struct file *file); |
| 79 | extern int mnt_clone_write(struct vfsmount *mnt); |
Dave Hansen | 8366025 | 2008-02-15 14:37:30 -0800 | [diff] [blame] | 80 | extern void mnt_drop_write(struct vfsmount *mnt); |
Al Viro | 2a79f17 | 2011-12-09 08:06:57 -0500 | [diff] [blame] | 81 | extern void mnt_drop_write_file(struct file *file); |
Nick Piggin | b3e19d9 | 2011-01-07 17:50:11 +1100 | [diff] [blame] | 82 | extern void mntput(struct vfsmount *mnt); |
| 83 | extern struct vfsmount *mntget(struct vfsmount *mnt); |
Al Viro | ca71cf7 | 2016-11-20 19:45:28 -0500 | [diff] [blame] | 84 | extern struct vfsmount *mnt_clone_internal(const struct path *path); |
Dave Hansen | 8366025 | 2008-02-15 14:37:30 -0800 | [diff] [blame] | 85 | extern int __mnt_is_readonly(struct vfsmount *mnt); |
Andy Lutomirski | 380cf5b | 2016-06-23 16:41:05 -0500 | [diff] [blame] | 86 | extern bool mnt_may_suid(struct vfsmount *mnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | |
Miklos Szeredi | c771d68 | 2014-10-24 00:14:36 +0200 | [diff] [blame] | 88 | struct path; |
Al Viro | ca71cf7 | 2016-11-20 19:45:28 -0500 | [diff] [blame] | 89 | extern struct vfsmount *clone_private_mount(const struct path *path); |
Miklos Szeredi | c771d68 | 2014-10-24 00:14:36 +0200 | [diff] [blame] | 90 | |
Trond Myklebust | bb4a58b | 2006-06-09 09:34:15 -0400 | [diff] [blame] | 91 | struct file_system_type; |
| 92 | extern struct vfsmount *vfs_kern_mount(struct file_system_type *type, |
| 93 | int flags, const char *name, |
| 94 | void *data); |
Eric W. Biederman | 93faccbb | 2017-02-01 06:06:16 +1300 | [diff] [blame] | 95 | extern struct vfsmount *vfs_submount(const struct dentry *mountpoint, |
| 96 | struct file_system_type *type, |
| 97 | const char *name, void *data); |
Trond Myklebust | bb4a58b | 2006-06-09 09:34:15 -0400 | [diff] [blame] | 98 | |
David Howells | ea5b778 | 2011-01-14 19:10:03 +0000 | [diff] [blame] | 99 | extern void mnt_set_expiry(struct vfsmount *mnt, struct list_head *expiry_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | extern void mark_mounts_for_expiry(struct list_head *mounts); |
| 101 | |
Dan Ehrenberg | e6e20a7 | 2015-02-10 15:20:49 -0800 | [diff] [blame] | 102 | extern dev_t name_to_dev_t(const char *name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | |
Eric W. Biederman | d292168 | 2016-09-28 00:27:17 -0500 | [diff] [blame] | 104 | extern unsigned int sysctl_mount_max; |
| 105 | |
Ian Kent | c6609c0 | 2016-11-24 08:03:41 +1100 | [diff] [blame] | 106 | extern bool path_is_mountpoint(const struct path *path); |
| 107 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | #endif /* _LINUX_MOUNT_H */ |