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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> * |
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*/ #ifndef _LINUX_MOUNT_H #define _LINUX_MOUNT_H |
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#include <linux/types.h> |
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#include <linux/list.h> |
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#include <linux/nodemask.h> |
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#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_READONLY 0x40 /* does the user want this to be r/o? */ |
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#define MNT_SHRINKABLE 0x100 |
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#define MNT_WRITE_HOLD 0x200 |
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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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/* * MNT_SHARED_MASK is the set of flags that should be cleared when a * mount becomes shared. Currently, this is only the flag that says a * mount cannot be bind mounted, since this is how we create a mount * that shares events with another mount. If you add a new MNT_* * flag, consider how it interacts with shared mounts. */ #define MNT_SHARED_MASK (MNT_UNBINDABLE) #define MNT_PROPAGATION_MASK (MNT_SHARED | MNT_UNBINDABLE) |
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#define MNT_INTERNAL 0x4000 |
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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 without fsnotify */ #ifdef CONFIG_FSNOTIFY __u32 mnt_fsnotify_mask; struct hlist_head mnt_fsnotify_marks; #endif |
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const 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_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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int mnt_id; /* mount identifier */ |
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int mnt_group_id; /* peer group identifier */ |
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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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int mnt_ghosts; |
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#ifdef CONFIG_SMP |
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int __percpu *mnt_writers; |
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#else int mnt_writers; #endif |
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}; |
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static inline int *get_mnt_writers_ptr(struct vfsmount *mnt) { #ifdef CONFIG_SMP return mnt->mnt_writers; #else return &mnt->mnt_writers; #endif } |
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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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struct file; /* forward dec */ |
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extern int mnt_want_write(struct vfsmount *mnt); |
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extern int mnt_want_write_file(struct file *file); extern int mnt_clone_write(struct vfsmount *mnt); |
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extern void mnt_drop_write(struct vfsmount *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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extern int __mnt_is_readonly(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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} } |
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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; |
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struct path; extern int do_add_mount(struct vfsmount *newmnt, struct path *path, |
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int mnt_flags, struct list_head *fslist); extern void mark_mounts_for_expiry(struct list_head *mounts); |
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extern dev_t name_to_dev_t(char *name); |
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#endif /* _LINUX_MOUNT_H */ |