82 lines
2.0 KiB
C
82 lines
2.0 KiB
C
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/*
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*
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* Definitions for mount interface. This describes the in the kernel build
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* linkedlist with mounted filesystems.
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*
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* Author: Marco van Wieringen <mvw@planets.elm.net>
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*
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* Version: $Id: mount.h,v 2.0 1996/11/17 16:48:14 mvw Exp mvw $
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*
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*/
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#ifndef _LINUX_MOUNT_H
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#define _LINUX_MOUNT_H
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#ifdef __KERNEL__
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#include <linux/list.h>
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#include <linux/spinlock.h>
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#include <asm/atomic.h>
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#define MNT_NOSUID 1
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#define MNT_NODEV 2
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#define MNT_NOEXEC 4
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struct vfsmount
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{
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struct list_head mnt_hash;
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struct vfsmount *mnt_parent; /* fs we are mounted on */
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struct dentry *mnt_mountpoint; /* dentry of mountpoint */
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struct dentry *mnt_root; /* root of the mounted tree */
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struct super_block *mnt_sb; /* pointer to superblock */
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struct list_head mnt_mounts; /* list of children, anchored here */
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struct list_head mnt_child; /* and going through their mnt_child */
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atomic_t mnt_count;
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int mnt_flags;
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int mnt_expiry_mark; /* true if marked for expiry */
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char *mnt_devname; /* Name of device e.g. /dev/dsk/hda1 */
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struct list_head mnt_list;
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struct list_head mnt_fslink; /* link in fs-specific expiry list */
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struct namespace *mnt_namespace; /* containing namespace */
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};
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static inline struct vfsmount *mntget(struct vfsmount *mnt)
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{
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if (mnt)
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atomic_inc(&mnt->mnt_count);
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return mnt;
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}
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extern void __mntput(struct vfsmount *mnt);
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static inline void _mntput(struct vfsmount *mnt)
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{
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if (mnt) {
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if (atomic_dec_and_test(&mnt->mnt_count))
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__mntput(mnt);
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}
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}
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static inline void mntput(struct vfsmount *mnt)
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{
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if (mnt) {
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mnt->mnt_expiry_mark = 0;
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_mntput(mnt);
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}
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}
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extern void free_vfsmnt(struct vfsmount *mnt);
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extern struct vfsmount *alloc_vfsmnt(const char *name);
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extern struct vfsmount *do_kern_mount(const char *fstype, int flags,
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const char *name, void *data);
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struct nameidata;
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extern int do_add_mount(struct vfsmount *newmnt, struct nameidata *nd,
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int mnt_flags, struct list_head *fslist);
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extern void mark_mounts_for_expiry(struct list_head *mounts);
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extern spinlock_t vfsmount_lock;
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#endif
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#endif /* _LINUX_MOUNT_H */
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