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git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - include/linux/mount.h
3 * Definitions for mount interface. This describes the in the kernel build
4 * linkedlist with mounted filesystems.
6 * Author: Marco van Wieringen <mvw@planets.elm.net>
10 #define _LINUX_MOUNT_H
12 #include <linux/types.h>
13 #include <linux/list.h>
14 #include <linux/nodemask.h>
15 #include <linux/spinlock.h>
16 #include <asm/atomic.h>
23 #define MNT_NOSUID 0x01
24 #define MNT_NODEV 0x02
25 #define MNT_NOEXEC 0x04
26 #define MNT_NOATIME 0x08
27 #define MNT_NODIRATIME 0x10
28 #define MNT_RELATIME 0x20
29 #define MNT_READONLY 0x40 /* does the user want this to be r/o? */
31 #define MNT_SHRINKABLE 0x100
32 #define MNT_IMBALANCED_WRITE_COUNT 0x200 /* just for debugging */
34 #define MNT_SHARED 0x1000 /* if the vfsmount is a shared mount */
35 #define MNT_UNBINDABLE 0x2000 /* if the vfsmount is a unbindable mount */
36 #define MNT_PNODE_MASK 0x3000 /* propagation flag mask */
39 struct list_head mnt_hash
;
40 struct vfsmount
*mnt_parent
; /* fs we are mounted on */
41 struct dentry
*mnt_mountpoint
; /* dentry of mountpoint */
42 struct dentry
*mnt_root
; /* root of the mounted tree */
43 struct super_block
*mnt_sb
; /* pointer to superblock */
44 struct list_head mnt_mounts
; /* list of children, anchored here */
45 struct list_head mnt_child
; /* and going through their mnt_child */
47 /* 4 bytes hole on 64bits arches */
48 const char *mnt_devname
; /* Name of device e.g. /dev/dsk/hda1 */
49 struct list_head mnt_list
;
50 struct list_head mnt_expire
; /* link in fs-specific expiry list */
51 struct list_head mnt_share
; /* circular list of shared mounts */
52 struct list_head mnt_slave_list
;/* list of slave mounts */
53 struct list_head mnt_slave
; /* slave list entry */
54 struct vfsmount
*mnt_master
; /* slave is on master->mnt_slave_list */
55 struct mnt_namespace
*mnt_ns
; /* containing namespace */
56 int mnt_id
; /* mount identifier */
57 int mnt_group_id
; /* peer group identifier */
59 * We put mnt_count & mnt_expiry_mark at the end of struct vfsmount
60 * to let these frequently modified fields in a separate cache line
61 * (so that reads of mnt_flags wont ping-pong on SMP machines)
64 int mnt_expiry_mark
; /* true if marked for expiry */
68 * This value is not stable unless all of the mnt_writers[] spinlocks
69 * are held, and all mnt_writer[]s on this mount have 0 as their ->count
71 atomic_t __mnt_writers
;
74 static inline struct vfsmount
*mntget(struct vfsmount
*mnt
)
77 atomic_inc(&mnt
->mnt_count
);
81 extern int mnt_want_write(struct vfsmount
*mnt
);
82 extern void mnt_drop_write(struct vfsmount
*mnt
);
83 extern void mntput_no_expire(struct vfsmount
*mnt
);
84 extern void mnt_pin(struct vfsmount
*mnt
);
85 extern void mnt_unpin(struct vfsmount
*mnt
);
86 extern int __mnt_is_readonly(struct vfsmount
*mnt
);
88 static inline void mntput(struct vfsmount
*mnt
)
91 mnt
->mnt_expiry_mark
= 0;
92 mntput_no_expire(mnt
);
96 extern struct vfsmount
*do_kern_mount(const char *fstype
, int flags
,
97 const char *name
, void *data
);
99 struct file_system_type
;
100 extern struct vfsmount
*vfs_kern_mount(struct file_system_type
*type
,
101 int flags
, const char *name
,
107 extern int do_add_mount(struct vfsmount
*newmnt
, struct path
*path
,
108 int mnt_flags
, struct list_head
*fslist
);
110 extern void mark_mounts_for_expiry(struct list_head
*mounts
);
112 extern spinlock_t vfsmount_lock
;
113 extern dev_t
name_to_dev_t(char *name
);
115 #endif /* _LINUX_MOUNT_H */