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include/linux/mount.h
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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__ |
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#include <linux/types.h> |
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#include <linux/list.h> #include <linux/spinlock.h> #include <asm/atomic.h> |
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struct super_block; struct vfsmount; struct dentry; |
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struct mnt_namespace; |
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#define MNT_NOSUID 0x01 #define MNT_NODEV 0x02 #define MNT_NOEXEC 0x04 |
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#define MNT_NOATIME 0x08 #define MNT_NODIRATIME 0x10 |
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#define MNT_RELATIME 0x20 |
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#define MNT_SHRINKABLE 0x100 |
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#define MNT_SHARED 0x1000 /* if the vfsmount is a shared mount */ #define MNT_UNBINDABLE 0x2000 /* if the vfsmount is a unbindable mount */ |
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#define MNT_PNODE_MASK 0x3000 /* propagation flag mask */ |
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struct vfsmount { |
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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 */ |
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int mnt_flags; |
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/* 4 bytes hole on 64bits arches */ |
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char *mnt_devname; /* Name of device e.g. /dev/dsk/hda1 */ struct list_head mnt_list; |
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struct list_head mnt_expire; /* link in fs-specific expiry list */ |
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struct list_head mnt_share; /* circular list of shared mounts */ |
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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 */ |
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struct mnt_namespace *mnt_ns; /* containing namespace */ |
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/* * 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 */ |
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int mnt_pinned; |
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}; static inline struct vfsmount *mntget(struct vfsmount *mnt) { if (mnt) atomic_inc(&mnt->mnt_count); return mnt; } |
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extern void mntput_no_expire(struct vfsmount *mnt); extern void mnt_pin(struct vfsmount *mnt); extern void mnt_unpin(struct vfsmount *mnt); |
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static inline void mntput(struct vfsmount *mnt) { if (mnt) { mnt->mnt_expiry_mark = 0; |
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mntput_no_expire(mnt); |
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} } 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); |
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struct file_system_type; extern struct vfsmount *vfs_kern_mount(struct file_system_type *type, int flags, const char *name, void *data); |
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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); |
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extern void shrink_submounts(struct vfsmount *mountpoint, struct list_head *mounts); |
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extern spinlock_t vfsmount_lock; |
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extern dev_t name_to_dev_t(char *name); |
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#endif #endif /* _LINUX_MOUNT_H */ |