cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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mount.h (4382B)


      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_H
     11#define _LINUX_MOUNT_H
     12
     13#include <linux/types.h>
     14#include <asm/barrier.h>
     15
     16struct super_block;
     17struct dentry;
     18struct user_namespace;
     19struct file_system_type;
     20struct fs_context;
     21struct file;
     22struct path;
     23
     24#define MNT_NOSUID	0x01
     25#define MNT_NODEV	0x02
     26#define MNT_NOEXEC	0x04
     27#define MNT_NOATIME	0x08
     28#define MNT_NODIRATIME	0x10
     29#define MNT_RELATIME	0x20
     30#define MNT_READONLY	0x40	/* does the user want this to be r/o? */
     31#define MNT_NOSYMFOLLOW	0x80
     32
     33#define MNT_SHRINKABLE	0x100
     34#define MNT_WRITE_HOLD	0x200
     35
     36#define MNT_SHARED	0x1000	/* if the vfsmount is a shared mount */
     37#define MNT_UNBINDABLE	0x2000	/* if the vfsmount is a unbindable mount */
     38/*
     39 * MNT_SHARED_MASK is the set of flags that should be cleared when a
     40 * mount becomes shared.  Currently, this is only the flag that says a
     41 * mount cannot be bind mounted, since this is how we create a mount
     42 * that shares events with another mount.  If you add a new MNT_*
     43 * flag, consider how it interacts with shared mounts.
     44 */
     45#define MNT_SHARED_MASK	(MNT_UNBINDABLE)
     46#define MNT_USER_SETTABLE_MASK  (MNT_NOSUID | MNT_NODEV | MNT_NOEXEC \
     47				 | MNT_NOATIME | MNT_NODIRATIME | MNT_RELATIME \
     48				 | MNT_READONLY | MNT_NOSYMFOLLOW)
     49#define MNT_ATIME_MASK (MNT_NOATIME | MNT_NODIRATIME | MNT_RELATIME )
     50
     51#define MNT_INTERNAL_FLAGS (MNT_SHARED | MNT_WRITE_HOLD | MNT_INTERNAL | \
     52			    MNT_DOOMED | MNT_SYNC_UMOUNT | MNT_MARKED | \
     53			    MNT_CURSOR)
     54
     55#define MNT_INTERNAL	0x4000
     56
     57#define MNT_LOCK_ATIME		0x040000
     58#define MNT_LOCK_NOEXEC		0x080000
     59#define MNT_LOCK_NOSUID		0x100000
     60#define MNT_LOCK_NODEV		0x200000
     61#define MNT_LOCK_READONLY	0x400000
     62#define MNT_LOCKED		0x800000
     63#define MNT_DOOMED		0x1000000
     64#define MNT_SYNC_UMOUNT		0x2000000
     65#define MNT_MARKED		0x4000000
     66#define MNT_UMOUNT		0x8000000
     67#define MNT_CURSOR		0x10000000
     68
     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 user_namespace *mnt_userns;
     74} __randomize_layout;
     75
     76static inline struct user_namespace *mnt_user_ns(const struct vfsmount *mnt)
     77{
     78	/* Pairs with smp_store_release() in do_idmap_mount(). */
     79	return smp_load_acquire(&mnt->mnt_userns);
     80}
     81
     82extern int mnt_want_write(struct vfsmount *mnt);
     83extern int mnt_want_write_file(struct file *file);
     84extern void mnt_drop_write(struct vfsmount *mnt);
     85extern void mnt_drop_write_file(struct file *file);
     86extern void mntput(struct vfsmount *mnt);
     87extern struct vfsmount *mntget(struct vfsmount *mnt);
     88extern struct vfsmount *mnt_clone_internal(const struct path *path);
     89extern bool __mnt_is_readonly(struct vfsmount *mnt);
     90extern bool mnt_may_suid(struct vfsmount *mnt);
     91
     92extern struct vfsmount *clone_private_mount(const struct path *path);
     93extern int __mnt_want_write(struct vfsmount *);
     94extern void __mnt_drop_write(struct vfsmount *);
     95
     96extern struct vfsmount *fc_mount(struct fs_context *fc);
     97extern struct vfsmount *vfs_create_mount(struct fs_context *fc);
     98extern struct vfsmount *vfs_kern_mount(struct file_system_type *type,
     99				      int flags, const char *name,
    100				      void *data);
    101extern struct vfsmount *vfs_submount(const struct dentry *mountpoint,
    102				     struct file_system_type *type,
    103				     const char *name, void *data);
    104
    105extern void mnt_set_expiry(struct vfsmount *mnt, struct list_head *expiry_list);
    106extern void mark_mounts_for_expiry(struct list_head *mounts);
    107
    108extern dev_t name_to_dev_t(const char *name);
    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 *);
    114extern void kern_unmount(struct vfsmount *mnt);
    115extern int may_umount_tree(struct vfsmount *);
    116extern int may_umount(struct vfsmount *);
    117extern long do_mount(const char *, const char __user *,
    118		     const char *, unsigned long, void *);
    119extern struct vfsmount *collect_mounts(const struct path *);
    120extern void drop_collected_mounts(struct vfsmount *);
    121extern int iterate_mounts(int (*)(struct vfsmount *, void *), void *,
    122			  struct vfsmount *);
    123extern void kern_unmount_array(struct vfsmount *mnt[], unsigned int num);
    124
    125#endif /* _LINUX_MOUNT_H */