mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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35b574a6c2
Pull mount fixes from Al Viro:
"Various mount-related bugfixes:
- split the do_move_mount() checks in subtree-of-our-ns and
entire-anon cases and adapt detached mount propagation selftest for
mount_setattr
- allow clone_private_mount() for a path on real rootfs
- fix a race in call of has_locked_children()
- fix move_mount propagation graph breakage by MOVE_MOUNT_SET_GROUP
- make sure clone_private_mnt() caller has CAP_SYS_ADMIN in the right
userns
- avoid false negatives in path_overmount()
- don't leak MNT_LOCKED from parent to child in finish_automount()
- do_change_type(): refuse to operate on unmounted/not ours mounts"
* tag 'pull-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
do_change_type(): refuse to operate on unmounted/not ours mounts
clone_private_mnt(): make sure that caller has CAP_SYS_ADMIN in the right userns
selftests/mount_setattr: adapt detached mount propagation test
do_move_mount(): split the checks in subtree-of-our-ns and entire-anon cases
fs: allow clone_private_mount() for a path on real rootfs
fix propagation graph breakage by MOVE_MOUNT_SET_GROUP move_mount(2)
finish_automount(): don't leak MNT_LOCKED from parent to child
path_overmount(): avoid false negatives
fs/fhandle.c: fix a race in call of has_locked_children()
128 lines
4.1 KiB
C
128 lines
4.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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*
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* Definitions for mount interface. This describes the in the kernel build
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* linkedlist with mounted filesystems.
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*
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* Author: Marco van Wieringen <mvw@planets.elm.net>
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*
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*/
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#ifndef _LINUX_MOUNT_H
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#define _LINUX_MOUNT_H
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#include <linux/types.h>
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#include <asm/barrier.h>
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struct super_block;
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struct dentry;
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struct user_namespace;
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struct mnt_idmap;
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struct file_system_type;
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struct fs_context;
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struct file;
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struct path;
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enum mount_flags {
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MNT_NOSUID = 0x01,
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MNT_NODEV = 0x02,
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MNT_NOEXEC = 0x04,
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MNT_NOATIME = 0x08,
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MNT_NODIRATIME = 0x10,
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MNT_RELATIME = 0x20,
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MNT_READONLY = 0x40, /* does the user want this to be r/o? */
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MNT_NOSYMFOLLOW = 0x80,
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MNT_SHRINKABLE = 0x100,
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MNT_WRITE_HOLD = 0x200,
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MNT_SHARED = 0x1000, /* if the vfsmount is a shared mount */
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MNT_UNBINDABLE = 0x2000, /* if the vfsmount is a unbindable mount */
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MNT_INTERNAL = 0x4000,
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MNT_LOCK_ATIME = 0x040000,
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MNT_LOCK_NOEXEC = 0x080000,
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MNT_LOCK_NOSUID = 0x100000,
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MNT_LOCK_NODEV = 0x200000,
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MNT_LOCK_READONLY = 0x400000,
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MNT_LOCKED = 0x800000,
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MNT_DOOMED = 0x1000000,
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MNT_SYNC_UMOUNT = 0x2000000,
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MNT_MARKED = 0x4000000,
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MNT_UMOUNT = 0x8000000,
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/*
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* MNT_SHARED_MASK is the set of flags that should be cleared when a
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* mount becomes shared. Currently, this is only the flag that says a
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* mount cannot be bind mounted, since this is how we create a mount
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* that shares events with another mount. If you add a new MNT_*
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* flag, consider how it interacts with shared mounts.
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*/
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MNT_SHARED_MASK = MNT_UNBINDABLE,
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MNT_USER_SETTABLE_MASK = MNT_NOSUID | MNT_NODEV | MNT_NOEXEC
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| MNT_NOATIME | MNT_NODIRATIME | MNT_RELATIME
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| MNT_READONLY | MNT_NOSYMFOLLOW,
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MNT_ATIME_MASK = MNT_NOATIME | MNT_NODIRATIME | MNT_RELATIME,
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MNT_INTERNAL_FLAGS = MNT_SHARED | MNT_WRITE_HOLD | MNT_INTERNAL |
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MNT_DOOMED | MNT_SYNC_UMOUNT | MNT_MARKED |
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MNT_LOCKED,
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};
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struct vfsmount {
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struct dentry *mnt_root; /* root of the mounted tree */
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struct super_block *mnt_sb; /* pointer to superblock */
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int mnt_flags;
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struct mnt_idmap *mnt_idmap;
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} __randomize_layout;
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static inline struct mnt_idmap *mnt_idmap(const struct vfsmount *mnt)
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{
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/* Pairs with smp_store_release() in do_idmap_mount(). */
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return READ_ONCE(mnt->mnt_idmap);
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}
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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);
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extern void mnt_drop_write(struct vfsmount *mnt);
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extern void mnt_drop_write_file(struct file *file);
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extern void mntput(struct vfsmount *mnt);
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extern struct vfsmount *mntget(struct vfsmount *mnt);
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extern void mnt_make_shortterm(struct vfsmount *mnt);
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extern struct vfsmount *mnt_clone_internal(const struct path *path);
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extern bool __mnt_is_readonly(struct vfsmount *mnt);
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extern bool mnt_may_suid(struct vfsmount *mnt);
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extern struct vfsmount *clone_private_mount(const struct path *path);
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int mnt_get_write_access(struct vfsmount *mnt);
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void mnt_put_write_access(struct vfsmount *mnt);
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extern struct vfsmount *fc_mount(struct fs_context *fc);
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extern struct vfsmount *vfs_create_mount(struct fs_context *fc);
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extern struct vfsmount *vfs_kern_mount(struct file_system_type *type,
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int flags, const char *name,
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void *data);
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extern void mnt_set_expiry(struct vfsmount *mnt, struct list_head *expiry_list);
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extern void mark_mounts_for_expiry(struct list_head *mounts);
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extern bool path_is_mountpoint(const struct path *path);
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extern bool our_mnt(struct vfsmount *mnt);
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extern struct vfsmount *kern_mount(struct file_system_type *);
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extern void kern_unmount(struct vfsmount *mnt);
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extern int may_umount_tree(struct vfsmount *);
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extern int may_umount(struct vfsmount *);
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int do_mount(const char *, const char __user *,
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const char *, unsigned long, void *);
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extern struct vfsmount *collect_mounts(const struct path *);
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extern void drop_collected_mounts(struct vfsmount *);
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extern int iterate_mounts(int (*)(struct vfsmount *, void *), void *,
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struct vfsmount *);
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extern void kern_unmount_array(struct vfsmount *mnt[], unsigned int num);
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extern int cifs_root_data(char **dev, char **opts);
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#endif /* _LINUX_MOUNT_H */
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