Subversion Repositories test_project

/*

 *

 * Definitions for mount interface. This describes the in the kernel build

 * linkedlist with mounted filesystems.

 *

 * Author:  Marco van Wieringen <mvw@planets.elm.net>

 *

 * Version: $Id: mount.h,v 2.0 1996/11/17 16:48:14 mvw Exp mvw $

 *

 */

#ifndef _LINUX_MOUNT_H

#define _LINUX_MOUNT_H

#ifdef __KERNEL__

#include <linux/types.h>

#include <linux/list.h>

#include <linux/spinlock.h>

#include <asm/atomic.h>

struct super_block;

struct vfsmount;

struct dentry;

struct mnt_namespace;

#define MNT_NOSUID      0x01

#define MNT_NODEV       0x02

#define MNT_NOEXEC      0x04

#define MNT_NOATIME     0x08

#define MNT_NODIRATIME  0x10

#define MNT_RELATIME    0x20

#define MNT_SHRINKABLE  0x100

#define MNT_SHARED      0x1000  /* if the vfsmount is a shared mount */

#define MNT_UNBINDABLE  0x2000  /* if the vfsmount is a unbindable mount */

#define MNT_PNODE_MASK  0x3000  /* propagation flag mask */

struct vfsmount {

        struct list_head mnt_hash;

        struct vfsmount *mnt_parent;    /* fs we are mounted on */

        struct dentry *mnt_mountpoint;  /* dentry of mountpoint */

        struct dentry *mnt_root;        /* root of the mounted tree */

        struct super_block *mnt_sb;     /* pointer to superblock */

        struct list_head mnt_mounts;    /* list of children, anchored here */

        struct list_head mnt_child;     /* and going through their mnt_child */

        int mnt_flags;

        /* 4 bytes hole on 64bits arches */

        char *mnt_devname;              /* Name of device e.g. /dev/dsk/hda1 */

        struct list_head mnt_list;

        struct list_head mnt_expire;    /* link in fs-specific expiry list */

        struct list_head mnt_share;     /* circular list of shared mounts */

        struct list_head mnt_slave_list;/* list of slave mounts */

        struct list_head mnt_slave;     /* slave list entry */

        struct vfsmount *mnt_master;    /* slave is on master->mnt_slave_list */

        struct mnt_namespace *mnt_ns;   /* containing namespace */

        /*

         * We put mnt_count & mnt_expiry_mark at the end of struct vfsmount

         * to let these frequently modified fields in a separate cache line

         * (so that reads of mnt_flags wont ping-pong on SMP machines)

         */

        atomic_t mnt_count;

        int mnt_expiry_mark;            /* true if marked for expiry */

        int mnt_pinned;

};

static inline struct vfsmount *mntget(struct vfsmount *mnt)

{

        if (mnt)

                atomic_inc(&mnt->mnt_count);

        return mnt;

}

extern void mntput_no_expire(struct vfsmount *mnt);

extern void mnt_pin(struct vfsmount *mnt);

extern void mnt_unpin(struct vfsmount *mnt);

static inline void mntput(struct vfsmount *mnt)

{

        if (mnt) {

                mnt->mnt_expiry_mark = 0;

                mntput_no_expire(mnt);

        }

}

extern void free_vfsmnt(struct vfsmount *mnt);

extern struct vfsmount *alloc_vfsmnt(const char *name);

extern struct vfsmount *do_kern_mount(const char *fstype, int flags,

                                      const char *name, void *data);

struct file_system_type;

extern struct vfsmount *vfs_kern_mount(struct file_system_type *type,

                                      int flags, const char *name,

                                      void *data);

struct nameidata;

extern int do_add_mount(struct vfsmount *newmnt, struct nameidata *nd,

                        int mnt_flags, struct list_head *fslist);

extern void mark_mounts_for_expiry(struct list_head *mounts);

extern void shrink_submounts(struct vfsmount *mountpoint, struct list_head *mounts);

extern spinlock_t vfsmount_lock;

extern dev_t name_to_dev_t(char *name);

#endif

#endif /* _LINUX_MOUNT_H */