Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | */ |
| 9 | #ifndef _LINUX_MOUNT_H |
| 10 | #define _LINUX_MOUNT_H |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | |
Andrew Morton | d53d9f1 | 2005-07-12 13:58:07 -0700 | [diff] [blame] | 12 | #include <linux/types.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | #include <linux/list.h> |
Dave Hansen | 3d73363 | 2008-02-15 14:37:59 -0800 | [diff] [blame] | 14 | #include <linux/nodemask.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/spinlock.h> |
Nick Piggin | b3e19d9 | 2011-01-07 17:50:11 +1100 | [diff] [blame] | 16 | #include <linux/seqlock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <asm/atomic.h> |
| 18 | |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 19 | struct super_block; |
| 20 | struct vfsmount; |
| 21 | struct dentry; |
Kirill Korotaev | 6b3286e | 2006-12-08 02:37:56 -0800 | [diff] [blame] | 22 | struct mnt_namespace; |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 23 | |
Ram Pai | 07b2088 | 2005-11-07 17:19:07 -0500 | [diff] [blame] | 24 | #define MNT_NOSUID 0x01 |
| 25 | #define MNT_NODEV 0x02 |
| 26 | #define MNT_NOEXEC 0x04 |
Christoph Hellwig | fc33a7b | 2006-01-09 20:52:17 -0800 | [diff] [blame] | 27 | #define MNT_NOATIME 0x08 |
| 28 | #define MNT_NODIRATIME 0x10 |
Valerie Henson | 47ae32d | 2006-12-13 00:34:34 -0800 | [diff] [blame] | 29 | #define MNT_RELATIME 0x20 |
Dave Hansen | 2e4b7fc | 2008-02-15 14:38:00 -0800 | [diff] [blame] | 30 | #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] | 31 | |
Trond Myklebust | 5528f911 | 2006-06-09 09:34:17 -0400 | [diff] [blame] | 32 | #define MNT_SHRINKABLE 0x100 |
npiggin@suse.de | d3ef3d7 | 2009-04-26 20:25:54 +1000 | [diff] [blame] | 33 | #define MNT_WRITE_HOLD 0x200 |
Trond Myklebust | 5528f911 | 2006-06-09 09:34:17 -0400 | [diff] [blame] | 34 | |
Christoph Hellwig | fc33a7b | 2006-01-09 20:52:17 -0800 | [diff] [blame] | 35 | #define MNT_SHARED 0x1000 /* if the vfsmount is a shared mount */ |
| 36 | #define MNT_UNBINDABLE 0x2000 /* if the vfsmount is a unbindable mount */ |
Valerie Aurora | 495d6c9 | 2010-01-26 14:20:47 -0500 | [diff] [blame] | 37 | /* |
| 38 | * MNT_SHARED_MASK is the set of flags that should be cleared when a |
| 39 | * mount becomes shared. Currently, this is only the flag that says a |
| 40 | * mount cannot be bind mounted, since this is how we create a mount |
| 41 | * that shares events with another mount. If you add a new MNT_* |
| 42 | * flag, consider how it interacts with shared mounts. |
| 43 | */ |
| 44 | #define MNT_SHARED_MASK (MNT_UNBINDABLE) |
| 45 | #define MNT_PROPAGATION_MASK (MNT_SHARED | MNT_UNBINDABLE) |
| 46 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | |
Al Viro | 8089352 | 2010-02-05 09:30:46 -0500 | [diff] [blame] | 48 | #define MNT_INTERNAL 0x4000 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | |
Nick Piggin | b3e19d9 | 2011-01-07 17:50:11 +1100 | [diff] [blame] | 50 | struct mnt_pcp { |
| 51 | int mnt_count; |
| 52 | int mnt_writers; |
| 53 | }; |
| 54 | |
Ram Pai | 07b2088 | 2005-11-07 17:19:07 -0500 | [diff] [blame] | 55 | struct vfsmount { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | struct list_head mnt_hash; |
| 57 | struct vfsmount *mnt_parent; /* fs we are mounted on */ |
| 58 | struct dentry *mnt_mountpoint; /* dentry of mountpoint */ |
| 59 | struct dentry *mnt_root; /* root of the mounted tree */ |
| 60 | struct super_block *mnt_sb; /* pointer to superblock */ |
Nick Piggin | b3e19d9 | 2011-01-07 17:50:11 +1100 | [diff] [blame] | 61 | #ifdef CONFIG_SMP |
| 62 | struct mnt_pcp __percpu *mnt_pcp; |
Al Viro | f03c659 | 2011-01-14 22:30:21 -0500 | [diff] [blame] | 63 | atomic_t mnt_longterm; /* how many of the refs are longterm */ |
Nick Piggin | b3e19d9 | 2011-01-07 17:50:11 +1100 | [diff] [blame] | 64 | #else |
| 65 | int mnt_count; |
| 66 | int mnt_writers; |
| 67 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | struct list_head mnt_mounts; /* list of children, anchored here */ |
| 69 | struct list_head mnt_child; /* and going through their mnt_child */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | int mnt_flags; |
Andreas Gruenbacher | 2504c5d | 2009-12-17 21:24:27 -0500 | [diff] [blame] | 71 | /* 4 bytes hole on 64bits arches without fsnotify */ |
| 72 | #ifdef CONFIG_FSNOTIFY |
| 73 | __u32 mnt_fsnotify_mask; |
| 74 | struct hlist_head mnt_fsnotify_marks; |
| 75 | #endif |
Li Zefan | 88b3878 | 2008-07-21 18:06:36 +0800 | [diff] [blame] | 76 | const char *mnt_devname; /* Name of device e.g. /dev/dsk/hda1 */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | struct list_head mnt_list; |
Miklos Szeredi | 55e700b | 2005-07-07 17:57:30 -0700 | [diff] [blame] | 78 | struct list_head mnt_expire; /* link in fs-specific expiry list */ |
Ram Pai | 03e06e6 | 2005-11-07 17:19:33 -0500 | [diff] [blame] | 79 | struct list_head mnt_share; /* circular list of shared mounts */ |
Ram Pai | a58b0eb | 2005-11-07 17:20:48 -0500 | [diff] [blame] | 80 | struct list_head mnt_slave_list;/* list of slave mounts */ |
| 81 | struct list_head mnt_slave; /* slave list entry */ |
| 82 | struct vfsmount *mnt_master; /* slave is on master->mnt_slave_list */ |
Kirill Korotaev | 6b3286e | 2006-12-08 02:37:56 -0800 | [diff] [blame] | 83 | struct mnt_namespace *mnt_ns; /* containing namespace */ |
Miklos Szeredi | 73cd49e | 2008-03-26 22:11:34 +0100 | [diff] [blame] | 84 | int mnt_id; /* mount identifier */ |
Miklos Szeredi | 719f5d7 | 2008-03-27 13:06:23 +0100 | [diff] [blame] | 85 | int mnt_group_id; /* peer group identifier */ |
Eric Dumazet | 4ba4d4c | 2007-02-10 01:44:48 -0800 | [diff] [blame] | 86 | int mnt_expiry_mark; /* true if marked for expiry */ |
Al Viro | 7b7b1ac | 2005-11-07 17:13:39 -0500 | [diff] [blame] | 87 | int mnt_pinned; |
Al Viro | 7c4b93d | 2008-03-21 23:59:49 -0400 | [diff] [blame] | 88 | int mnt_ghosts; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | }; |
| 90 | |
npiggin@suse.de | 96029c4 | 2009-04-26 20:25:55 +1000 | [diff] [blame] | 91 | struct file; /* forward dec */ |
| 92 | |
Dave Hansen | 8366025 | 2008-02-15 14:37:30 -0800 | [diff] [blame] | 93 | extern int mnt_want_write(struct vfsmount *mnt); |
npiggin@suse.de | 96029c4 | 2009-04-26 20:25:55 +1000 | [diff] [blame] | 94 | extern int mnt_want_write_file(struct file *file); |
| 95 | extern int mnt_clone_write(struct vfsmount *mnt); |
Dave Hansen | 8366025 | 2008-02-15 14:37:30 -0800 | [diff] [blame] | 96 | extern void mnt_drop_write(struct vfsmount *mnt); |
Nick Piggin | b3e19d9 | 2011-01-07 17:50:11 +1100 | [diff] [blame] | 97 | extern void mntput(struct vfsmount *mnt); |
| 98 | extern struct vfsmount *mntget(struct vfsmount *mnt); |
Al Viro | 7b7b1ac | 2005-11-07 17:13:39 -0500 | [diff] [blame] | 99 | extern void mnt_pin(struct vfsmount *mnt); |
| 100 | extern void mnt_unpin(struct vfsmount *mnt); |
Dave Hansen | 8366025 | 2008-02-15 14:37:30 -0800 | [diff] [blame] | 101 | extern int __mnt_is_readonly(struct vfsmount *mnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | extern struct vfsmount *do_kern_mount(const char *fstype, int flags, |
| 104 | const char *name, void *data); |
| 105 | |
Trond Myklebust | bb4a58b | 2006-06-09 09:34:15 -0400 | [diff] [blame] | 106 | struct file_system_type; |
| 107 | extern struct vfsmount *vfs_kern_mount(struct file_system_type *type, |
| 108 | int flags, const char *name, |
| 109 | void *data); |
| 110 | |
David Howells | ea5b778 | 2011-01-14 19:10:03 +0000 | [diff] [blame] | 111 | 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] | 112 | extern void mark_mounts_for_expiry(struct list_head *mounts); |
| 113 | |
Andrew Morton | d53d9f1 | 2005-07-12 13:58:07 -0700 | [diff] [blame] | 114 | extern dev_t name_to_dev_t(char *name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | #endif /* _LINUX_MOUNT_H */ |