diff options
author | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-08-05 17:04:01 -0300 |
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committer | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-08-05 17:04:01 -0300 |
commit | 57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch) | |
tree | 5e910f0e82173f4ef4f51111366a3f1299037a7b /fs/mount.h |
Initial import
Diffstat (limited to 'fs/mount.h')
-rw-r--r-- | fs/mount.h | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/fs/mount.h b/fs/mount.h new file mode 100644 index 000000000..6a61c2b3e --- /dev/null +++ b/fs/mount.h @@ -0,0 +1,140 @@ +#include <linux/mount.h> +#include <linux/seq_file.h> +#include <linux/poll.h> +#include <linux/ns_common.h> +#include <linux/fs_pin.h> + +struct mnt_namespace { + atomic_t count; + struct ns_common ns; + struct mount * root; + struct list_head list; + struct user_namespace *user_ns; + u64 seq; /* Sequence number to prevent loops */ + wait_queue_head_t poll; + u64 event; +}; + +struct mnt_pcp { + int mnt_count; + int mnt_writers; +}; + +struct mountpoint { + struct hlist_node m_hash; + struct dentry *m_dentry; + struct hlist_head m_list; + int m_count; +}; + +struct mount { + struct hlist_node mnt_hash; + struct mount *mnt_parent; + struct dentry *mnt_mountpoint; + struct vfsmount mnt; + union { + struct rcu_head mnt_rcu; + struct llist_node mnt_llist; + }; +#ifdef CONFIG_SMP + struct mnt_pcp __percpu *mnt_pcp; +#else + int mnt_count; + int mnt_writers; +#endif + struct list_head mnt_mounts; /* list of children, anchored here */ + struct list_head mnt_child; /* and going through their mnt_child */ + struct list_head mnt_instance; /* mount instance on sb->s_mounts */ + const 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 list_head mnt_share; /* circular list of shared mounts */ + struct list_head mnt_slave_list;/* list of slave mounts */ + struct list_head mnt_slave; /* slave list entry */ + struct mount *mnt_master; /* slave is on master->mnt_slave_list */ + struct mnt_namespace *mnt_ns; /* containing namespace */ + struct mountpoint *mnt_mp; /* where is it mounted */ + struct hlist_node mnt_mp_list; /* list mounts with the same mountpoint */ +#ifdef CONFIG_FSNOTIFY + struct hlist_head mnt_fsnotify_marks; + __u32 mnt_fsnotify_mask; +#endif + int mnt_id; /* mount identifier */ + int mnt_group_id; /* peer group identifier */ + int mnt_expiry_mark; /* true if marked for expiry */ + struct hlist_head mnt_pins; + struct fs_pin mnt_umount; + struct dentry *mnt_ex_mountpoint; +}; + +#define MNT_NS_INTERNAL ERR_PTR(-EINVAL) /* distinct from any mnt_namespace */ + +static inline struct mount *real_mount(struct vfsmount *mnt) +{ + return container_of(mnt, struct mount, mnt); +} + +static inline int mnt_has_parent(struct mount *mnt) +{ + return mnt != mnt->mnt_parent; +} + +static inline int is_mounted(struct vfsmount *mnt) +{ + /* neither detached nor internal? */ + return !IS_ERR_OR_NULL(real_mount(mnt)->mnt_ns); +} + +extern struct mount *__lookup_mnt(struct vfsmount *, struct dentry *); +extern struct mount *__lookup_mnt_last(struct vfsmount *, struct dentry *); + +extern bool legitimize_mnt(struct vfsmount *, unsigned); + +extern void __detach_mounts(struct dentry *dentry); + +static inline void detach_mounts(struct dentry *dentry) +{ + if (!d_mountpoint(dentry)) + return; + __detach_mounts(dentry); +} + +static inline void get_mnt_ns(struct mnt_namespace *ns) +{ + atomic_inc(&ns->count); +} + +extern seqlock_t mount_lock; + +static inline void lock_mount_hash(void) +{ + write_seqlock(&mount_lock); +} + +static inline void unlock_mount_hash(void) +{ + write_sequnlock(&mount_lock); +} + +struct proc_mounts { + struct seq_file m; + struct mnt_namespace *ns; + struct path root; + int (*show)(struct seq_file *, struct vfsmount *); + void *cached_mount; + u64 cached_event; + loff_t cached_index; +}; + +#define proc_mounts(p) (container_of((p), struct proc_mounts, m)) + +extern const struct seq_operations mounts_op; + +extern bool __is_local_mountpoint(struct dentry *dentry); +static inline bool is_local_mountpoint(struct dentry *dentry) +{ + if (!d_mountpoint(dentry)) + return false; + + return __is_local_mountpoint(dentry); +} |