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 <[email protected]> 7 * 8 * Version: $Id: mount.h,v 2.0 1996/11/17 16:48:14 mvw Exp mvw $ 9 * 10 */ 11 #ifndef _LINUX_MOUNT_H 12 #define _LINUX_MOUNT_H 13 #ifdef __KERNEL__ 14 15 #include <linux/types.h> 16 #include <linux/list.h> 17 #include <linux/spinlock.h> 18 #include <asm/atomic.h> 19 20 #define MNT_NOSUID 0x01 21 #define MNT_NODEV 0x02 22 #define MNT_NOEXEC 0x04 23 #define MNT_NOATIME 0x08 24 #define MNT_NODIRATIME 0x10 25 26 #define MNT_SHARED 0x1000 /* if the vfsmount is a shared mount */ 27 #define MNT_UNBINDABLE 0x2000 /* if the vfsmount is a unbindable mount */ 28 #define MNT_PNODE_MASK 0x3000 /* propogation flag mask */ 29 30 struct vfsmount { 31 struct list_head mnt_hash; 32 struct vfsmount *mnt_parent; /* fs we are mounted on */ 33 struct dentry *mnt_mountpoint; /* dentry of mountpoint */ 34 struct dentry *mnt_root; /* root of the mounted tree */ 35 struct super_block *mnt_sb; /* pointer to superblock */ 36 struct list_head mnt_mounts; /* list of children, anchored here */ 37 struct list_head mnt_child; /* and going through their mnt_child */ 38 atomic_t mnt_count; 39 int mnt_flags; 40 int mnt_expiry_mark; /* true if marked for expiry */ 41 char *mnt_devname; /* Name of device e.g. /dev/dsk/hda1 */ 42 struct list_head mnt_list; 43 struct list_head mnt_expire; /* link in fs-specific expiry list */ 44 struct list_head mnt_share; /* circular list of shared mounts */ 45 struct list_head mnt_slave_list;/* list of slave mounts */ 46 struct list_head mnt_slave; /* slave list entry */ 47 struct vfsmount *mnt_master; /* slave is on master->mnt_slave_list */ 48 struct namespace *mnt_namespace; /* containing namespace */ 49 int mnt_pinned; 50 }; 51 52 static inline struct vfsmount *mntget(struct vfsmount *mnt) 53 { 54 if (mnt) 55 atomic_inc(&mnt->mnt_count); 56 return mnt; 57 } 58 59 extern void mntput_no_expire(struct vfsmount *mnt); 60 extern void mnt_pin(struct vfsmount *mnt); 61 extern void mnt_unpin(struct vfsmount *mnt); 62 63 static inline void mntput(struct vfsmount *mnt) 64 { 65 if (mnt) { 66 mnt->mnt_expiry_mark = 0; 67 mntput_no_expire(mnt); 68 } 69 } 70 71 extern void free_vfsmnt(struct vfsmount *mnt); 72 extern struct vfsmount *alloc_vfsmnt(const char *name); 73 extern struct vfsmount *do_kern_mount(const char *fstype, int flags, 74 const char *name, void *data); 75 76 struct nameidata; 77 78 extern int do_add_mount(struct vfsmount *newmnt, struct nameidata *nd, 79 int mnt_flags, struct list_head *fslist); 80 81 extern void mark_mounts_for_expiry(struct list_head *mounts); 82 83 extern spinlock_t vfsmount_lock; 84 extern dev_t name_to_dev_t(char *name); 85 86 #endif 87 #endif /* _LINUX_MOUNT_H */ 88