mount.h
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上传日期:2009-04-28
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- /*
- *
- * 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>
- #define MNT_NOSUID 1
- #define MNT_NODEV 2
- #define MNT_NOEXEC 4
- 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 */
- atomic_t mnt_count;
- int mnt_flags;
- int mnt_expiry_mark; /* true if marked for expiry */
- 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 namespace *mnt_namespace; /* containing namespace */
- };
- static inline struct vfsmount *mntget(struct vfsmount *mnt)
- {
- if (mnt)
- atomic_inc(&mnt->mnt_count);
- return mnt;
- }
- extern void __mntput(struct vfsmount *mnt);
- static inline void mntput_no_expire(struct vfsmount *mnt)
- {
- if (mnt) {
- if (atomic_dec_and_test(&mnt->mnt_count))
- __mntput(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 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 spinlock_t vfsmount_lock;
- extern dev_t name_to_dev_t(char *name);
- #endif
- #endif /* _LINUX_MOUNT_H */