128 lines · c
1/* SPDX-License-Identifier: GPL-2.0 */2/*3 *4 * Definitions for mount interface. This describes the in the kernel build 5 * linkedlist with mounted filesystems.6 *7 * Author: Marco van Wieringen <mvw@planets.elm.net>8 *9 */10#ifndef _LINUX_MOUNT_H11#define _LINUX_MOUNT_H12 13#include <linux/types.h>14#include <asm/barrier.h>15 16struct super_block;17struct dentry;18struct user_namespace;19struct mnt_idmap;20struct file_system_type;21struct fs_context;22struct file;23struct path;24 25#define MNT_NOSUID 0x0126#define MNT_NODEV 0x0227#define MNT_NOEXEC 0x0428#define MNT_NOATIME 0x0829#define MNT_NODIRATIME 0x1030#define MNT_RELATIME 0x2031#define MNT_READONLY 0x40 /* does the user want this to be r/o? */32#define MNT_NOSYMFOLLOW 0x8033 34#define MNT_SHRINKABLE 0x10035#define MNT_WRITE_HOLD 0x20036 37#define MNT_SHARED 0x1000 /* if the vfsmount is a shared mount */38#define MNT_UNBINDABLE 0x2000 /* if the vfsmount is a unbindable mount */39/*40 * MNT_SHARED_MASK is the set of flags that should be cleared when a41 * mount becomes shared. Currently, this is only the flag that says a42 * mount cannot be bind mounted, since this is how we create a mount43 * that shares events with another mount. If you add a new MNT_*44 * flag, consider how it interacts with shared mounts.45 */46#define MNT_SHARED_MASK (MNT_UNBINDABLE)47#define MNT_USER_SETTABLE_MASK (MNT_NOSUID | MNT_NODEV | MNT_NOEXEC \48 | MNT_NOATIME | MNT_NODIRATIME | MNT_RELATIME \49 | MNT_READONLY | MNT_NOSYMFOLLOW)50#define MNT_ATIME_MASK (MNT_NOATIME | MNT_NODIRATIME | MNT_RELATIME )51 52#define MNT_INTERNAL_FLAGS (MNT_SHARED | MNT_WRITE_HOLD | MNT_INTERNAL | \53 MNT_DOOMED | MNT_SYNC_UMOUNT | MNT_MARKED | MNT_ONRB)54 55#define MNT_INTERNAL 0x400056 57#define MNT_LOCK_ATIME 0x04000058#define MNT_LOCK_NOEXEC 0x08000059#define MNT_LOCK_NOSUID 0x10000060#define MNT_LOCK_NODEV 0x20000061#define MNT_LOCK_READONLY 0x40000062#define MNT_LOCKED 0x80000063#define MNT_DOOMED 0x100000064#define MNT_SYNC_UMOUNT 0x200000065#define MNT_MARKED 0x400000066#define MNT_UMOUNT 0x800000067#define MNT_ONRB 0x1000000068 69struct vfsmount {70 struct dentry *mnt_root; /* root of the mounted tree */71 struct super_block *mnt_sb; /* pointer to superblock */72 int mnt_flags;73 struct mnt_idmap *mnt_idmap;74} __randomize_layout;75 76static inline struct mnt_idmap *mnt_idmap(const struct vfsmount *mnt)77{78 /* Pairs with smp_store_release() in do_idmap_mount(). */79 return smp_load_acquire(&mnt->mnt_idmap);80}81 82extern int mnt_want_write(struct vfsmount *mnt) HWJS_SUSPENDS;83extern int mnt_want_write_file(struct file *file) HWJS_SUSPENDS;84extern void mnt_drop_write(struct vfsmount *mnt) HWJS_SUSPENDS;85extern void mnt_drop_write_file(struct file *file) HWJS_SUSPENDS;86extern void mntput(struct vfsmount *mnt) HWJS_SUSPENDS;87extern struct vfsmount *mntget(struct vfsmount *mnt);88extern void mnt_make_shortterm(struct vfsmount *mnt);89extern struct vfsmount *mnt_clone_internal(const struct path *path);90extern bool __mnt_is_readonly(struct vfsmount *mnt);91extern bool mnt_may_suid(struct vfsmount *mnt);92 93extern struct vfsmount *clone_private_mount(const struct path *path) HWJS_SUSPENDS;94int mnt_get_write_access(struct vfsmount *mnt);95void mnt_put_write_access(struct vfsmount *mnt);96 97extern struct vfsmount *fc_mount(struct fs_context *fc) HWJS_SUSPENDS;98extern struct vfsmount *vfs_create_mount(struct fs_context *fc);99extern struct vfsmount *vfs_kern_mount(struct file_system_type *type,100 int flags, const char *name,101 void *data) HWJS_SUSPENDS;102extern struct vfsmount *vfs_submount(const struct dentry *mountpoint,103 struct file_system_type *type,104 const char *name, void *data) HWJS_SUSPENDS;105 106extern void mnt_set_expiry(struct vfsmount *mnt, struct list_head *expiry_list) HWJS_SUSPENDS;107extern void mark_mounts_for_expiry(struct list_head *mounts) HWJS_SUSPENDS;108 109extern bool path_is_mountpoint(const struct path *path);110 111extern bool our_mnt(struct vfsmount *mnt);112 113extern struct vfsmount *kern_mount(struct file_system_type *) HWJS_SUSPENDS;114extern void kern_unmount(struct vfsmount *mnt) HWJS_SUSPENDS;115extern int may_umount_tree(struct vfsmount *);116extern int may_umount(struct vfsmount *) HWJS_SUSPENDS;117extern long do_mount(const char *, const char __user *,118 const char *, unsigned long, void *) HWJS_SUSPENDS;119extern struct vfsmount *collect_mounts(const struct path *) HWJS_SUSPENDS;120extern void drop_collected_mounts(struct vfsmount *) HWJS_SUSPENDS;121extern int iterate_mounts(int (*)(struct vfsmount *, void *), void *,122 struct vfsmount *) HWJS_SUSPENDS;123extern void kern_unmount_array(struct vfsmount *mnt[], unsigned int num) HWJS_SUSPENDS;124 125extern int cifs_root_data(char **dev, char **opts);126 127#endif /* _LINUX_MOUNT_H */128