diff options
Diffstat (limited to 'include/linux/mount.h')
| -rw-r--r-- | include/linux/mount.h | 105 |
1 files changed, 68 insertions, 37 deletions
diff --git a/include/linux/mount.h b/include/linux/mount.h index 73005f9957ea..acfe7ef86a1b 100644 --- a/include/linux/mount.h +++ b/include/linux/mount.h @@ -1,3 +1,4 @@ +/* SPDX-License-Identifier: GPL-2.0 */ /* * * Definitions for mount interface. This describes the in the kernel build @@ -10,65 +11,81 @@ #define _LINUX_MOUNT_H #include <linux/types.h> -#include <linux/list.h> -#include <linux/nodemask.h> -#include <linux/spinlock.h> -#include <linux/seqlock.h> -#include <linux/atomic.h> +#include <asm/barrier.h> struct super_block; -struct vfsmount; struct dentry; -struct mnt_namespace; +struct user_namespace; +struct mnt_idmap; +struct file_system_type; +struct fs_context; +struct file; +struct path; -#define MNT_NOSUID 0x01 -#define MNT_NODEV 0x02 -#define MNT_NOEXEC 0x04 -#define MNT_NOATIME 0x08 -#define MNT_NODIRATIME 0x10 -#define MNT_RELATIME 0x20 -#define MNT_READONLY 0x40 /* does the user want this to be r/o? */ +enum mount_flags { + MNT_NOSUID = 0x01, + MNT_NODEV = 0x02, + MNT_NOEXEC = 0x04, + MNT_NOATIME = 0x08, + MNT_NODIRATIME = 0x10, + MNT_RELATIME = 0x20, + MNT_READONLY = 0x40, /* does the user want this to be r/o? */ + MNT_NOSYMFOLLOW = 0x80, -#define MNT_SHRINKABLE 0x100 -#define MNT_WRITE_HOLD 0x200 + MNT_SHRINKABLE = 0x100, -#define MNT_SHARED 0x1000 /* if the vfsmount is a shared mount */ -#define MNT_UNBINDABLE 0x2000 /* if the vfsmount is a unbindable mount */ -/* - * 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) + MNT_INTERNAL = 0x4000, + MNT_LOCK_ATIME = 0x040000, + MNT_LOCK_NOEXEC = 0x080000, + MNT_LOCK_NOSUID = 0x100000, + MNT_LOCK_NODEV = 0x200000, + MNT_LOCK_READONLY = 0x400000, + MNT_LOCKED = 0x800000, + MNT_DOOMED = 0x1000000, + MNT_SYNC_UMOUNT = 0x2000000, + MNT_UMOUNT = 0x8000000, -#define MNT_INTERNAL 0x4000 + MNT_USER_SETTABLE_MASK = MNT_NOSUID | MNT_NODEV | MNT_NOEXEC + | MNT_NOATIME | MNT_NODIRATIME | MNT_RELATIME + | MNT_READONLY | MNT_NOSYMFOLLOW, + MNT_ATIME_MASK = MNT_NOATIME | MNT_NODIRATIME | MNT_RELATIME, -#define MNT_LOCK_READONLY 0x400000 + MNT_INTERNAL_FLAGS = MNT_INTERNAL | MNT_DOOMED | + MNT_SYNC_UMOUNT | MNT_LOCKED +}; struct vfsmount { struct dentry *mnt_root; /* root of the mounted tree */ struct super_block *mnt_sb; /* pointer to superblock */ int mnt_flags; -}; + struct mnt_idmap *mnt_idmap; +} __randomize_layout; -struct file; /* forward dec */ +static inline struct mnt_idmap *mnt_idmap(const struct vfsmount *mnt) +{ + /* Pairs with smp_store_release() in do_idmap_mount(). */ + return READ_ONCE(mnt->mnt_idmap); +} extern int mnt_want_write(struct vfsmount *mnt); extern int mnt_want_write_file(struct file *file); -extern int mnt_clone_write(struct vfsmount *mnt); extern void mnt_drop_write(struct vfsmount *mnt); extern void mnt_drop_write_file(struct file *file); extern void mntput(struct vfsmount *mnt); extern struct vfsmount *mntget(struct vfsmount *mnt); -extern void mnt_pin(struct vfsmount *mnt); -extern void mnt_unpin(struct vfsmount *mnt); -extern int __mnt_is_readonly(struct vfsmount *mnt); +extern void mnt_make_shortterm(struct vfsmount *mnt); +extern struct vfsmount *mnt_clone_internal(const struct path *path); +extern bool __mnt_is_readonly(const struct vfsmount *mnt); +extern bool mnt_may_suid(struct vfsmount *mnt); -struct file_system_type; +extern struct vfsmount *clone_private_mount(const struct path *path); +int mnt_get_write_access(struct vfsmount *mnt); +void mnt_put_write_access(struct vfsmount *mnt); + +extern struct vfsmount *fc_mount(struct fs_context *fc); +extern struct vfsmount *fc_mount_longterm(struct fs_context *fc); +extern struct vfsmount *vfs_create_mount(struct fs_context *fc); extern struct vfsmount *vfs_kern_mount(struct file_system_type *type, int flags, const char *name, void *data); @@ -76,6 +93,20 @@ extern struct vfsmount *vfs_kern_mount(struct file_system_type *type, extern void mnt_set_expiry(struct vfsmount *mnt, struct list_head *expiry_list); extern void mark_mounts_for_expiry(struct list_head *mounts); -extern dev_t name_to_dev_t(char *name); +extern bool path_is_mountpoint(const struct path *path); + +extern bool our_mnt(struct vfsmount *mnt); + +extern struct vfsmount *kern_mount(struct file_system_type *); +extern void kern_unmount(struct vfsmount *mnt); +extern int may_umount_tree(struct vfsmount *); +extern int may_umount(struct vfsmount *); +int do_mount(const char *, const char __user *, + const char *, unsigned long, void *); +extern const struct path *collect_paths(const struct path *, struct path *, unsigned); +extern void drop_collected_paths(const struct path *, const struct path *); +extern void kern_unmount_array(struct vfsmount *mnt[], unsigned int num); + +extern int cifs_root_data(char **dev, char **opts); #endif /* _LINUX_MOUNT_H */ |