Lines Matching refs:mnt
111 static inline struct hlist_head *m_hash(struct vfsmount *mnt, struct dentry *dentry) in m_hash() argument
113 unsigned long tmp = ((unsigned long)mnt / L1_CACHE_BYTES); in m_hash()
126 static int mnt_alloc_id(struct mount *mnt) in mnt_alloc_id() argument
132 mnt->mnt_id = res; in mnt_alloc_id()
136 static void mnt_free_id(struct mount *mnt) in mnt_free_id() argument
138 ida_free(&mnt_id_ida, mnt->mnt_id); in mnt_free_id()
144 static int mnt_alloc_group_id(struct mount *mnt) in mnt_alloc_group_id() argument
150 mnt->mnt_group_id = res; in mnt_alloc_group_id()
157 void mnt_release_group_id(struct mount *mnt) in mnt_release_group_id() argument
159 ida_free(&mnt_group_ida, mnt->mnt_group_id); in mnt_release_group_id()
160 mnt->mnt_group_id = 0; in mnt_release_group_id()
166 static inline void mnt_add_count(struct mount *mnt, int n) in mnt_add_count() argument
169 this_cpu_add(mnt->mnt_pcp->mnt_count, n); in mnt_add_count()
172 mnt->mnt_count += n; in mnt_add_count()
180 int mnt_get_count(struct mount *mnt) in mnt_get_count() argument
187 count += per_cpu_ptr(mnt->mnt_pcp, cpu)->mnt_count; in mnt_get_count()
192 return mnt->mnt_count; in mnt_get_count()
198 struct mount *mnt = kmem_cache_zalloc(mnt_cache, GFP_KERNEL); in alloc_vfsmnt() local
199 if (mnt) { in alloc_vfsmnt()
202 err = mnt_alloc_id(mnt); in alloc_vfsmnt()
207 mnt->mnt_devname = kstrdup_const(name, in alloc_vfsmnt()
209 if (!mnt->mnt_devname) in alloc_vfsmnt()
214 mnt->mnt_pcp = alloc_percpu(struct mnt_pcp); in alloc_vfsmnt()
215 if (!mnt->mnt_pcp) in alloc_vfsmnt()
218 this_cpu_add(mnt->mnt_pcp->mnt_count, 1); in alloc_vfsmnt()
220 mnt->mnt_count = 1; in alloc_vfsmnt()
221 mnt->mnt_writers = 0; in alloc_vfsmnt()
224 INIT_HLIST_NODE(&mnt->mnt_hash); in alloc_vfsmnt()
225 INIT_LIST_HEAD(&mnt->mnt_child); in alloc_vfsmnt()
226 INIT_LIST_HEAD(&mnt->mnt_mounts); in alloc_vfsmnt()
227 INIT_LIST_HEAD(&mnt->mnt_list); in alloc_vfsmnt()
228 INIT_LIST_HEAD(&mnt->mnt_expire); in alloc_vfsmnt()
229 INIT_LIST_HEAD(&mnt->mnt_share); in alloc_vfsmnt()
230 INIT_LIST_HEAD(&mnt->mnt_slave_list); in alloc_vfsmnt()
231 INIT_LIST_HEAD(&mnt->mnt_slave); in alloc_vfsmnt()
232 INIT_HLIST_NODE(&mnt->mnt_mp_list); in alloc_vfsmnt()
233 INIT_LIST_HEAD(&mnt->mnt_umounting); in alloc_vfsmnt()
234 INIT_HLIST_HEAD(&mnt->mnt_stuck_children); in alloc_vfsmnt()
235 mnt->mnt.mnt_userns = &init_user_ns; in alloc_vfsmnt()
237 return mnt; in alloc_vfsmnt()
241 kfree_const(mnt->mnt_devname); in alloc_vfsmnt()
244 mnt_free_id(mnt); in alloc_vfsmnt()
246 kmem_cache_free(mnt_cache, mnt); in alloc_vfsmnt()
269 bool __mnt_is_readonly(struct vfsmount *mnt) in __mnt_is_readonly() argument
271 return (mnt->mnt_flags & MNT_READONLY) || sb_rdonly(mnt->mnt_sb); in __mnt_is_readonly()
275 static inline void mnt_inc_writers(struct mount *mnt) in mnt_inc_writers() argument
278 this_cpu_inc(mnt->mnt_pcp->mnt_writers); in mnt_inc_writers()
280 mnt->mnt_writers++; in mnt_inc_writers()
284 static inline void mnt_dec_writers(struct mount *mnt) in mnt_dec_writers() argument
287 this_cpu_dec(mnt->mnt_pcp->mnt_writers); in mnt_dec_writers()
289 mnt->mnt_writers--; in mnt_dec_writers()
293 static unsigned int mnt_get_writers(struct mount *mnt) in mnt_get_writers() argument
300 count += per_cpu_ptr(mnt->mnt_pcp, cpu)->mnt_writers; in mnt_get_writers()
305 return mnt->mnt_writers; in mnt_get_writers()
309 static int mnt_is_readonly(struct vfsmount *mnt) in mnt_is_readonly() argument
311 if (mnt->mnt_sb->s_readonly_remount) in mnt_is_readonly()
315 return __mnt_is_readonly(mnt); in mnt_is_readonly()
336 struct mount *mnt = real_mount(m); in __mnt_want_write() local
340 mnt_inc_writers(mnt); in __mnt_want_write()
348 while (READ_ONCE(mnt->mnt.mnt_flags) & MNT_WRITE_HOLD) { in __mnt_want_write()
372 mnt_dec_writers(mnt); in __mnt_want_write()
417 if (__mnt_is_readonly(file->f_path.mnt)) in __mnt_want_write_file()
421 return __mnt_want_write(file->f_path.mnt); in __mnt_want_write_file()
453 void __mnt_drop_write(struct vfsmount *mnt) in __mnt_drop_write() argument
456 mnt_dec_writers(real_mount(mnt)); in __mnt_drop_write()
468 void mnt_drop_write(struct vfsmount *mnt) in mnt_drop_write() argument
470 __mnt_drop_write(mnt); in mnt_drop_write()
471 sb_end_write(mnt->mnt_sb); in mnt_drop_write()
478 __mnt_drop_write(file->f_path.mnt); in __mnt_drop_write_file()
506 static inline int mnt_hold_writers(struct mount *mnt) in mnt_hold_writers() argument
508 mnt->mnt.mnt_flags |= MNT_WRITE_HOLD; in mnt_hold_writers()
531 if (mnt_get_writers(mnt) > 0) in mnt_hold_writers()
549 static inline void mnt_unhold_writers(struct mount *mnt) in mnt_unhold_writers() argument
556 mnt->mnt.mnt_flags &= ~MNT_WRITE_HOLD; in mnt_unhold_writers()
559 static int mnt_make_readonly(struct mount *mnt) in mnt_make_readonly() argument
563 ret = mnt_hold_writers(mnt); in mnt_make_readonly()
565 mnt->mnt.mnt_flags |= MNT_READONLY; in mnt_make_readonly()
566 mnt_unhold_writers(mnt); in mnt_make_readonly()
572 struct mount *mnt; in sb_prepare_remount_readonly() local
580 list_for_each_entry(mnt, &sb->s_mounts, mnt_instance) { in sb_prepare_remount_readonly()
581 if (!(mnt->mnt.mnt_flags & MNT_READONLY)) { in sb_prepare_remount_readonly()
582 err = mnt_hold_writers(mnt); in sb_prepare_remount_readonly()
594 list_for_each_entry(mnt, &sb->s_mounts, mnt_instance) { in sb_prepare_remount_readonly()
595 if (mnt->mnt.mnt_flags & MNT_WRITE_HOLD) in sb_prepare_remount_readonly()
596 mnt->mnt.mnt_flags &= ~MNT_WRITE_HOLD; in sb_prepare_remount_readonly()
603 static void free_vfsmnt(struct mount *mnt) in free_vfsmnt() argument
607 mnt_userns = mnt_user_ns(&mnt->mnt); in free_vfsmnt()
610 kfree_const(mnt->mnt_devname); in free_vfsmnt()
612 free_percpu(mnt->mnt_pcp); in free_vfsmnt()
614 kmem_cache_free(mnt_cache, mnt); in free_vfsmnt()
625 struct mount *mnt; in __legitimize_mnt() local
630 mnt = real_mount(bastard); in __legitimize_mnt()
631 mnt_add_count(mnt, 1); in __legitimize_mnt()
636 mnt_add_count(mnt, -1); in __legitimize_mnt()
641 mnt_add_count(mnt, -1); in __legitimize_mnt()
668 struct mount *__lookup_mnt(struct vfsmount *mnt, struct dentry *dentry) in __lookup_mnt() argument
670 struct hlist_head *head = m_hash(mnt, dentry); in __lookup_mnt()
674 if (&p->mnt_parent->mnt == mnt && p->mnt_mountpoint == dentry) in __lookup_mnt()
704 child_mnt = __lookup_mnt(path->mnt, path->dentry); in lookup_mnt()
705 m = child_mnt ? &child_mnt->mnt : NULL; in lookup_mnt()
721 static inline bool mnt_is_cursor(struct mount *mnt) in mnt_is_cursor() argument
723 return mnt->mnt.mnt_flags & MNT_CURSOR; in mnt_is_cursor()
744 struct mount *mnt; in __is_local_mountpoint() local
749 list_for_each_entry(mnt, &ns->list, mnt_list) { in __is_local_mountpoint()
750 if (mnt_is_cursor(mnt)) in __is_local_mountpoint()
752 is_covered = (mnt->mnt_mountpoint == dentry); in __is_local_mountpoint()
850 static inline int check_mnt(struct mount *mnt) in check_mnt() argument
852 return mnt->mnt_ns == current->nsproxy->mnt_ns; in check_mnt()
880 static struct mountpoint *unhash_mnt(struct mount *mnt) in unhash_mnt() argument
883 mnt->mnt_parent = mnt; in unhash_mnt()
884 mnt->mnt_mountpoint = mnt->mnt.mnt_root; in unhash_mnt()
885 list_del_init(&mnt->mnt_child); in unhash_mnt()
886 hlist_del_init_rcu(&mnt->mnt_hash); in unhash_mnt()
887 hlist_del_init(&mnt->mnt_mp_list); in unhash_mnt()
888 mp = mnt->mnt_mp; in unhash_mnt()
889 mnt->mnt_mp = NULL; in unhash_mnt()
896 static void umount_mnt(struct mount *mnt) in umount_mnt() argument
898 put_mountpoint(unhash_mnt(mnt)); in umount_mnt()
904 void mnt_set_mountpoint(struct mount *mnt, in mnt_set_mountpoint() argument
909 mnt_add_count(mnt, 1); /* essentially, that's mntget */ in mnt_set_mountpoint()
911 child_mnt->mnt_parent = mnt; in mnt_set_mountpoint()
916 static void __attach_mnt(struct mount *mnt, struct mount *parent) in __attach_mnt() argument
918 hlist_add_head_rcu(&mnt->mnt_hash, in __attach_mnt()
919 m_hash(&parent->mnt, mnt->mnt_mountpoint)); in __attach_mnt()
920 list_add_tail(&mnt->mnt_child, &parent->mnt_mounts); in __attach_mnt()
926 static void attach_mnt(struct mount *mnt, in attach_mnt() argument
930 mnt_set_mountpoint(parent, mp, mnt); in attach_mnt()
931 __attach_mnt(mnt, parent); in attach_mnt()
934 void mnt_change_mountpoint(struct mount *parent, struct mountpoint *mp, struct mount *mnt) in mnt_change_mountpoint() argument
936 struct mountpoint *old_mp = mnt->mnt_mp; in mnt_change_mountpoint()
937 struct mount *old_parent = mnt->mnt_parent; in mnt_change_mountpoint()
939 list_del_init(&mnt->mnt_child); in mnt_change_mountpoint()
940 hlist_del_init(&mnt->mnt_mp_list); in mnt_change_mountpoint()
941 hlist_del_init_rcu(&mnt->mnt_hash); in mnt_change_mountpoint()
943 attach_mnt(mnt, parent, mp); in mnt_change_mountpoint()
952 static void commit_tree(struct mount *mnt) in commit_tree() argument
954 struct mount *parent = mnt->mnt_parent; in commit_tree()
959 BUG_ON(parent == mnt); in commit_tree()
961 list_add_tail(&head, &mnt->mnt_list); in commit_tree()
970 __attach_mnt(mnt, parent); in commit_tree()
1011 struct mount *mnt; in vfs_create_mount() local
1017 mnt = alloc_vfsmnt(fc->source ?: "none"); in vfs_create_mount()
1018 if (!mnt) in vfs_create_mount()
1022 mnt->mnt.mnt_flags = MNT_INTERNAL; in vfs_create_mount()
1025 mnt->mnt.mnt_sb = fc->root->d_sb; in vfs_create_mount()
1026 mnt->mnt.mnt_root = dget(fc->root); in vfs_create_mount()
1027 mnt->mnt_mountpoint = mnt->mnt.mnt_root; in vfs_create_mount()
1028 mnt->mnt_parent = mnt; in vfs_create_mount()
1030 fs_userns = mnt->mnt.mnt_sb->s_user_ns; in vfs_create_mount()
1032 mnt->mnt.mnt_userns = get_user_ns(fs_userns); in vfs_create_mount()
1035 list_add_tail(&mnt->mnt_instance, &mnt->mnt.mnt_sb->s_mounts); in vfs_create_mount()
1037 return &mnt->mnt; in vfs_create_mount()
1057 struct vfsmount *mnt; in vfs_kern_mount() local
1073 mnt = fc_mount(fc); in vfs_kern_mount()
1075 mnt = ERR_PTR(ret); in vfs_kern_mount()
1078 return mnt; in vfs_kern_mount()
1100 struct super_block *sb = old->mnt.mnt_sb; in clone_mnt()
1101 struct mount *mnt; in clone_mnt() local
1104 mnt = alloc_vfsmnt(old->mnt_devname); in clone_mnt()
1105 if (!mnt) in clone_mnt()
1109 mnt->mnt_group_id = 0; /* not a peer of original */ in clone_mnt()
1111 mnt->mnt_group_id = old->mnt_group_id; in clone_mnt()
1113 if ((flag & CL_MAKE_SHARED) && !mnt->mnt_group_id) { in clone_mnt()
1114 err = mnt_alloc_group_id(mnt); in clone_mnt()
1119 mnt->mnt.mnt_flags = old->mnt.mnt_flags; in clone_mnt()
1120 mnt->mnt.mnt_flags &= ~(MNT_WRITE_HOLD|MNT_MARKED|MNT_INTERNAL); in clone_mnt()
1123 mnt->mnt.mnt_userns = mnt_user_ns(&old->mnt); in clone_mnt()
1124 if (!initial_idmapping(mnt->mnt.mnt_userns)) in clone_mnt()
1125 mnt->mnt.mnt_userns = get_user_ns(mnt->mnt.mnt_userns); in clone_mnt()
1126 mnt->mnt.mnt_sb = sb; in clone_mnt()
1127 mnt->mnt.mnt_root = dget(root); in clone_mnt()
1128 mnt->mnt_mountpoint = mnt->mnt.mnt_root; in clone_mnt()
1129 mnt->mnt_parent = mnt; in clone_mnt()
1131 list_add_tail(&mnt->mnt_instance, &sb->s_mounts); in clone_mnt()
1136 list_add(&mnt->mnt_slave, &old->mnt_slave_list); in clone_mnt()
1137 mnt->mnt_master = old; in clone_mnt()
1138 CLEAR_MNT_SHARED(mnt); in clone_mnt()
1141 list_add(&mnt->mnt_share, &old->mnt_share); in clone_mnt()
1143 list_add(&mnt->mnt_slave, &old->mnt_slave); in clone_mnt()
1144 mnt->mnt_master = old->mnt_master; in clone_mnt()
1146 CLEAR_MNT_SHARED(mnt); in clone_mnt()
1149 set_mnt_shared(mnt); in clone_mnt()
1155 list_add(&mnt->mnt_expire, &old->mnt_expire); in clone_mnt()
1158 return mnt; in clone_mnt()
1161 mnt_free_id(mnt); in clone_mnt()
1162 free_vfsmnt(mnt); in clone_mnt()
1166 static void cleanup_mnt(struct mount *mnt) in cleanup_mnt() argument
1177 WARN_ON(mnt_get_writers(mnt)); in cleanup_mnt()
1178 if (unlikely(mnt->mnt_pins.first)) in cleanup_mnt()
1179 mnt_pin_kill(mnt); in cleanup_mnt()
1180 hlist_for_each_entry_safe(m, p, &mnt->mnt_stuck_children, mnt_umount) { in cleanup_mnt()
1182 mntput(&m->mnt); in cleanup_mnt()
1184 fsnotify_vfsmount_delete(&mnt->mnt); in cleanup_mnt()
1185 dput(mnt->mnt.mnt_root); in cleanup_mnt()
1186 deactivate_super(mnt->mnt.mnt_sb); in cleanup_mnt()
1187 mnt_free_id(mnt); in cleanup_mnt()
1188 call_rcu(&mnt->mnt_rcu, delayed_free_vfsmnt); in cleanup_mnt()
1207 static void mntput_no_expire(struct mount *mnt) in mntput_no_expire() argument
1213 if (likely(READ_ONCE(mnt->mnt_ns))) { in mntput_no_expire()
1223 mnt_add_count(mnt, -1); in mntput_no_expire()
1233 mnt_add_count(mnt, -1); in mntput_no_expire()
1234 count = mnt_get_count(mnt); in mntput_no_expire()
1241 if (unlikely(mnt->mnt.mnt_flags & MNT_DOOMED)) { in mntput_no_expire()
1246 mnt->mnt.mnt_flags |= MNT_DOOMED; in mntput_no_expire()
1249 list_del(&mnt->mnt_instance); in mntput_no_expire()
1251 if (unlikely(!list_empty(&mnt->mnt_mounts))) { in mntput_no_expire()
1253 list_for_each_entry_safe(p, tmp, &mnt->mnt_mounts, mnt_child) { in mntput_no_expire()
1255 hlist_add_head(&p->mnt_umount, &mnt->mnt_stuck_children); in mntput_no_expire()
1261 if (likely(!(mnt->mnt.mnt_flags & MNT_INTERNAL))) { in mntput_no_expire()
1264 init_task_work(&mnt->mnt_rcu, __cleanup_mnt); in mntput_no_expire()
1265 if (!task_work_add(task, &mnt->mnt_rcu, TWA_RESUME)) in mntput_no_expire()
1268 if (llist_add(&mnt->mnt_llist, &delayed_mntput_list)) in mntput_no_expire()
1272 cleanup_mnt(mnt); in mntput_no_expire()
1275 void mntput(struct vfsmount *mnt) in mntput() argument
1277 if (mnt) { in mntput()
1278 struct mount *m = real_mount(mnt); in mntput()
1287 struct vfsmount *mntget(struct vfsmount *mnt) in mntget() argument
1289 if (mnt) in mntget()
1290 mnt_add_count(real_mount(mnt), 1); in mntget()
1291 return mnt; in mntget()
1328 p = clone_mnt(real_mount(path->mnt), path->dentry, CL_PRIVATE); in mnt_clone_internal()
1331 p->mnt.mnt_flags |= MNT_INTERNAL; in mnt_clone_internal()
1332 return &p->mnt; in mnt_clone_internal()
1339 struct mount *mnt, *ret = NULL; in mnt_list_next() local
1343 mnt = list_entry(p, typeof(*mnt), mnt_list); in mnt_list_next()
1344 if (!mnt_is_cursor(mnt)) { in mnt_list_next()
1345 ret = mnt; in mnt_list_next()
1377 struct mount *mnt = v; in m_next() local
1380 return mnt_list_next(p->ns, &mnt->mnt_list); in m_next()
1386 struct mount *mnt = v; in m_stop() local
1389 if (mnt) in m_stop()
1390 list_move_tail(&p->cursor.mnt_list, &mnt->mnt_list); in m_stop()
1401 return p->show(m, &r->mnt); in m_show()
1431 struct mount *mnt = real_mount(m); in may_umount_tree() local
1439 for (p = mnt; p; p = next_mnt(p, mnt)) { in may_umount_tree()
1466 int may_umount(struct vfsmount *mnt) in may_umount() argument
1471 if (propagate_mount_busy(real_mount(mnt), 2)) in may_umount()
1501 mntput(&m->mnt); in namespace_unlock()
1516 static bool disconnect_mount(struct mount *mnt, enum umount_tree_flags how) in disconnect_mount() argument
1523 if (!mnt_has_parent(mnt)) in disconnect_mount()
1530 if (!(mnt->mnt_parent->mnt.mnt_flags & MNT_UMOUNT)) in disconnect_mount()
1538 if (IS_MNT_LOCKED(mnt)) in disconnect_mount()
1549 static void umount_tree(struct mount *mnt, enum umount_tree_flags how) in umount_tree() argument
1555 propagate_mount_unlock(mnt); in umount_tree()
1558 for (p = mnt; p; p = next_mnt(p, mnt)) { in umount_tree()
1559 p->mnt.mnt_flags |= MNT_UMOUNT; in umount_tree()
1585 p->mnt.mnt_flags |= MNT_SYNC_UMOUNT; in umount_tree()
1603 static void shrink_submounts(struct mount *mnt);
1628 static int do_umount(struct mount *mnt, int flags) in do_umount() argument
1630 struct super_block *sb = mnt->mnt.mnt_sb; in do_umount()
1633 retval = security_sb_umount(&mnt->mnt, flags); in do_umount()
1644 if (&mnt->mnt == current->fs->root.mnt || in do_umount()
1653 if (mnt_get_count(mnt) != 2) { in do_umount()
1659 if (!xchg(&mnt->mnt_expiry_mark, 1)) in do_umount()
1686 if (&mnt->mnt == current->fs->root.mnt && !(flags & MNT_DETACH)) { in do_umount()
1701 if (mnt->mnt.mnt_flags & MNT_LOCKED) in do_umount()
1706 if (!list_empty(&mnt->mnt_list)) in do_umount()
1707 umount_tree(mnt, UMOUNT_PROPAGATE); in do_umount()
1710 shrink_submounts(mnt); in do_umount()
1712 if (!propagate_mount_busy(mnt, 2)) { in do_umount()
1713 if (!list_empty(&mnt->mnt_list)) in do_umount()
1714 umount_tree(mnt, UMOUNT_PROPAGATE|UMOUNT_SYNC); in do_umount()
1737 struct mount *mnt; in __detach_mounts() local
1747 mnt = hlist_entry(mp->m_list.first, struct mount, mnt_mp_list); in __detach_mounts()
1748 if (mnt->mnt.mnt_flags & MNT_UMOUNT) { in __detach_mounts()
1749 umount_mnt(mnt); in __detach_mounts()
1750 hlist_add_head(&mnt->mnt_umount, &unmounted); in __detach_mounts()
1752 else umount_tree(mnt, UMOUNT_CONNECTED); in __detach_mounts()
1779 struct mount *mnt = real_mount(path->mnt); in can_umount() local
1783 if (path->dentry != path->mnt->mnt_root) in can_umount()
1785 if (!check_mnt(mnt)) in can_umount()
1787 if (mnt->mnt.mnt_flags & MNT_LOCKED) /* Check optimistically */ in can_umount()
1797 struct mount *mnt = real_mount(path->mnt); in path_umount() local
1802 ret = do_umount(mnt, flags); in path_umount()
1806 mntput_no_expire(mnt); in path_umount()
1857 struct ns_common *from_mnt_ns(struct mnt_namespace *mnt) in from_mnt_ns() argument
1859 return &mnt->ns; in from_mnt_ns()
1875 struct mount *copy_tree(struct mount *mnt, struct dentry *dentry, in copy_tree() argument
1880 if (!(flag & CL_COPY_UNBINDABLE) && IS_MNT_UNBINDABLE(mnt)) in copy_tree()
1886 res = q = clone_mnt(mnt, dentry, flag); in copy_tree()
1890 q->mnt_mountpoint = mnt->mnt_mountpoint; in copy_tree()
1892 p = mnt; in copy_tree()
1893 list_for_each_entry(r, &mnt->mnt_mounts, mnt_child) { in copy_tree()
1901 if (s->mnt.mnt_flags & MNT_LOCKED) { in copy_tree()
1911 is_mnt_ns_file(s->mnt.mnt_root)) { in copy_tree()
1921 q = clone_mnt(p, p->mnt.mnt_root, flag); in copy_tree()
1946 if (!check_mnt(real_mount(path->mnt))) in collect_mounts()
1949 tree = copy_tree(real_mount(path->mnt), path->dentry, in collect_mounts()
1954 return &tree->mnt; in collect_mounts()
1960 void dissolve_on_fput(struct vfsmount *mnt) in dissolve_on_fput() argument
1965 ns = real_mount(mnt)->mnt_ns; in dissolve_on_fput()
1968 umount_tree(real_mount(mnt), UMOUNT_CONNECTED); in dissolve_on_fput()
1978 void drop_collected_mounts(struct vfsmount *mnt) in drop_collected_mounts() argument
1982 umount_tree(real_mount(mnt), 0); in drop_collected_mounts()
1987 static bool has_locked_children(struct mount *mnt, struct dentry *dentry) in has_locked_children() argument
1991 list_for_each_entry(child, &mnt->mnt_mounts, mnt_child) { in has_locked_children()
1995 if (child->mnt.mnt_flags & MNT_LOCKED) in has_locked_children()
2013 struct mount *old_mnt = real_mount(path->mnt); in clone_private_mount()
2035 return &new_mnt->mnt; in clone_private_mount()
2046 struct mount *mnt; in iterate_mounts() local
2050 list_for_each_entry(mnt, &real_mount(root)->mnt_list, mnt_list) { in iterate_mounts()
2051 res = f(&mnt->mnt, arg); in iterate_mounts()
2058 static void lock_mnt_tree(struct mount *mnt) in lock_mnt_tree() argument
2062 for (p = mnt; p; p = next_mnt(p, mnt)) { in lock_mnt_tree()
2063 int flags = p->mnt.mnt_flags; in lock_mnt_tree()
2081 p->mnt.mnt_flags = flags; in lock_mnt_tree()
2085 static void cleanup_group_ids(struct mount *mnt, struct mount *end) in cleanup_group_ids() argument
2089 for (p = mnt; p != end; p = next_mnt(p, mnt)) { in cleanup_group_ids()
2095 static int invent_group_ids(struct mount *mnt, bool recurse) in invent_group_ids() argument
2099 for (p = mnt; p; p = recurse ? next_mnt(p, mnt) : NULL) { in invent_group_ids()
2103 cleanup_group_ids(mnt, p); in invent_group_ids()
2112 int count_mounts(struct mnt_namespace *ns, struct mount *mnt) in count_mounts() argument
2125 for (p = mnt; p; p = next_mnt(p, mnt)) in count_mounts()
2214 smp = get_mountpoint(source_mnt->mnt.mnt_root); in attach_recursive_mnt()
2254 q = __lookup_mnt(&child->mnt_parent->mnt, in attach_recursive_mnt()
2261 child->mnt.mnt_flags &= ~MNT_LOCKED; in attach_recursive_mnt()
2289 struct vfsmount *mnt; in lock_mount() local
2298 mnt = lookup_mnt(path); in lock_mount()
2299 if (likely(!mnt)) { in lock_mount()
2311 path->mnt = mnt; in lock_mount()
2312 dentry = path->dentry = dget(mnt->mnt_root); in lock_mount()
2328 static int graft_tree(struct mount *mnt, struct mount *p, struct mountpoint *mp) in graft_tree() argument
2330 if (mnt->mnt.mnt_sb->s_flags & SB_NOUSER) in graft_tree()
2334 d_is_dir(mnt->mnt.mnt_root)) in graft_tree()
2337 return attach_recursive_mnt(mnt, p, mp, false); in graft_tree()
2363 struct mount *mnt = real_mount(path->mnt); in do_change_type() local
2368 if (path->dentry != path->mnt->mnt_root) in do_change_type()
2377 err = invent_group_ids(mnt, recurse); in do_change_type()
2383 for (m = mnt; m; m = (recurse ? next_mnt(m, mnt) : NULL)) in do_change_type()
2394 struct mount *mnt = ERR_PTR(-EINVAL), *old = real_mount(old_path->mnt); in __do_loopback() local
2397 return mnt; in __do_loopback()
2400 return mnt; in __do_loopback()
2403 return mnt; in __do_loopback()
2406 mnt = copy_tree(old, old_path->dentry, CL_COPY_MNT_NS_FILE); in __do_loopback()
2408 mnt = clone_mnt(old, old_path->dentry, 0); in __do_loopback()
2410 if (!IS_ERR(mnt)) in __do_loopback()
2411 mnt->mnt.mnt_flags &= ~MNT_LOCKED; in __do_loopback()
2413 return mnt; in __do_loopback()
2423 struct mount *mnt = NULL, *parent; in do_loopback() local
2442 parent = real_mount(path->mnt); in do_loopback()
2446 mnt = __do_loopback(&old_path, recurse); in do_loopback()
2447 if (IS_ERR(mnt)) { in do_loopback()
2448 err = PTR_ERR(mnt); in do_loopback()
2452 err = graft_tree(mnt, parent, mp); in do_loopback()
2455 umount_tree(mnt, UMOUNT_SYNC); in do_loopback()
2469 struct mount *mnt, *p; in open_detached_copy() local
2476 mnt = __do_loopback(path, recursive); in open_detached_copy()
2477 if (IS_ERR(mnt)) { in open_detached_copy()
2480 return ERR_CAST(mnt); in open_detached_copy()
2484 for (p = mnt; p; p = next_mnt(p, mnt)) { in open_detached_copy()
2488 ns->root = mnt; in open_detached_copy()
2489 list_add_tail(&ns->list, &mnt->mnt_list); in open_detached_copy()
2490 mntget(&mnt->mnt); in open_detached_copy()
2494 mntput(path->mnt); in open_detached_copy()
2495 path->mnt = &mnt->mnt; in open_detached_copy()
2498 dissolve_on_fput(path->mnt); in open_detached_copy()
2561 static bool can_change_locked_flags(struct mount *mnt, unsigned int mnt_flags) in can_change_locked_flags() argument
2563 unsigned int fl = mnt->mnt.mnt_flags; in can_change_locked_flags()
2588 static int change_mount_ro_state(struct mount *mnt, unsigned int mnt_flags) in change_mount_ro_state() argument
2592 if (readonly_request == __mnt_is_readonly(&mnt->mnt)) in change_mount_ro_state()
2596 return mnt_make_readonly(mnt); in change_mount_ro_state()
2598 mnt->mnt.mnt_flags &= ~MNT_READONLY; in change_mount_ro_state()
2602 static void set_mount_attributes(struct mount *mnt, unsigned int mnt_flags) in set_mount_attributes() argument
2604 mnt_flags |= mnt->mnt.mnt_flags & ~MNT_USER_SETTABLE_MASK; in set_mount_attributes()
2605 mnt->mnt.mnt_flags = mnt_flags; in set_mount_attributes()
2606 touch_mnt_namespace(mnt->mnt_ns); in set_mount_attributes()
2609 static void mnt_warn_timestamp_expiry(struct path *mountpoint, struct vfsmount *mnt) in mnt_warn_timestamp_expiry() argument
2611 struct super_block *sb = mnt->mnt_sb; in mnt_warn_timestamp_expiry()
2613 if (!__mnt_is_readonly(mnt) && in mnt_warn_timestamp_expiry()
2624 is_mounted(mnt) ? "remounted" : "mounted", in mnt_warn_timestamp_expiry()
2640 struct super_block *sb = path->mnt->mnt_sb; in do_reconfigure_mnt()
2641 struct mount *mnt = real_mount(path->mnt); in do_reconfigure_mnt() local
2644 if (!check_mnt(mnt)) in do_reconfigure_mnt()
2647 if (path->dentry != mnt->mnt.mnt_root) in do_reconfigure_mnt()
2650 if (!can_change_locked_flags(mnt, mnt_flags)) in do_reconfigure_mnt()
2659 ret = change_mount_ro_state(mnt, mnt_flags); in do_reconfigure_mnt()
2661 set_mount_attributes(mnt, mnt_flags); in do_reconfigure_mnt()
2665 mnt_warn_timestamp_expiry(path, &mnt->mnt); in do_reconfigure_mnt()
2679 struct super_block *sb = path->mnt->mnt_sb; in do_remount()
2680 struct mount *mnt = real_mount(path->mnt); in do_remount() local
2683 if (!check_mnt(mnt)) in do_remount()
2686 if (path->dentry != path->mnt->mnt_root) in do_remount()
2689 if (!can_change_locked_flags(mnt, mnt_flags)) in do_remount()
2705 set_mount_attributes(mnt, mnt_flags); in do_remount()
2712 mnt_warn_timestamp_expiry(path, &mnt->mnt); in do_remount()
2718 static inline int tree_contains_unbindable(struct mount *mnt) in tree_contains_unbindable() argument
2721 for (p = mnt; p; p = next_mnt(p, mnt)) { in tree_contains_unbindable()
2741 if (mnt_ns_loop(p->mnt.mnt_root)) in check_for_nsfs_mounts()
2755 from = real_mount(from_path->mnt); in do_set_group()
2756 to = real_mount(to_path->mnt); in do_set_group()
2762 if (!is_mounted(&from->mnt)) in do_set_group()
2764 if (!is_mounted(&to->mnt)) in do_set_group()
2776 if (from_path->dentry != from_path->mnt->mnt_root) in do_set_group()
2778 if (to_path->dentry != to_path->mnt->mnt_root) in do_set_group()
2782 if (from->mnt.mnt_sb != to->mnt.mnt_sb) in do_set_group()
2786 if (!is_subdir(to->mnt.mnt_root, from->mnt.mnt_root)) in do_set_group()
2790 if (has_locked_children(from, to->mnt.mnt_root)) in do_set_group()
2836 old = real_mount(old_path->mnt); in do_move_mount()
2837 p = real_mount(new_path->mnt); in do_move_mount()
2849 if (!is_mounted(&old->mnt)) in do_move_mount()
2856 if (old->mnt.mnt_flags & MNT_LOCKED) in do_move_mount()
2859 if (old_path->dentry != old_path->mnt->mnt_root) in do_move_mount()
2883 err = attach_recursive_mnt(old, real_mount(new_path->mnt), mp, in do_move_mount()
2927 struct mount *parent = real_mount(path->mnt); in do_add_mount()
2941 if (path->mnt->mnt_sb == newmnt->mnt.mnt_sb && in do_add_mount()
2942 path->mnt->mnt_root == path->dentry) in do_add_mount()
2945 if (d_is_symlink(newmnt->mnt.mnt_root)) in do_add_mount()
2948 newmnt->mnt.mnt_flags = mnt_flags; in do_add_mount()
2961 struct vfsmount *mnt; in do_new_mount_fc() local
2977 mnt = vfs_create_mount(fc); in do_new_mount_fc()
2978 if (IS_ERR(mnt)) in do_new_mount_fc()
2979 return PTR_ERR(mnt); in do_new_mount_fc()
2981 mnt_warn_timestamp_expiry(mountpoint, mnt); in do_new_mount_fc()
2985 mntput(mnt); in do_new_mount_fc()
2988 error = do_add_mount(real_mount(mnt), mp, mountpoint, mnt_flags); in do_new_mount_fc()
2991 mntput(mnt); in do_new_mount_fc()
3052 struct mount *mnt; in finish_automount() local
3060 mnt = real_mount(m); in finish_automount()
3064 BUG_ON(mnt_get_count(mnt) < 2); in finish_automount()
3066 if (m->mnt_sb == path->mnt->mnt_sb && in finish_automount()
3084 if (unlikely(__lookup_mnt(path->mnt, dentry))) { in finish_automount()
3096 err = do_add_mount(mnt, mp, path, path->mnt->mnt_flags | MNT_SHRINKABLE); in finish_automount()
3108 if (!list_empty(&mnt->mnt_expire)) { in finish_automount()
3110 list_del_init(&mnt->mnt_expire); in finish_automount()
3123 void mnt_set_expiry(struct vfsmount *mnt, struct list_head *expiry_list) in mnt_set_expiry() argument
3127 list_add_tail(&real_mount(mnt)->mnt_expire, expiry_list); in mnt_set_expiry()
3140 struct mount *mnt, *next; in mark_mounts_for_expiry() local
3155 list_for_each_entry_safe(mnt, next, mounts, mnt_expire) { in mark_mounts_for_expiry()
3156 if (!xchg(&mnt->mnt_expiry_mark, 1) || in mark_mounts_for_expiry()
3157 propagate_mount_busy(mnt, 1)) in mark_mounts_for_expiry()
3159 list_move(&mnt->mnt_expire, &graveyard); in mark_mounts_for_expiry()
3162 mnt = list_first_entry(&graveyard, struct mount, mnt_expire); in mark_mounts_for_expiry()
3163 touch_mnt_namespace(mnt->mnt_ns); in mark_mounts_for_expiry()
3164 umount_tree(mnt, UMOUNT_PROPAGATE|UMOUNT_SYNC); in mark_mounts_for_expiry()
3189 struct mount *mnt = list_entry(tmp, struct mount, mnt_child); in select_submounts() local
3192 if (!(mnt->mnt.mnt_flags & MNT_SHRINKABLE)) in select_submounts()
3197 if (!list_empty(&mnt->mnt_mounts)) { in select_submounts()
3198 this_parent = mnt; in select_submounts()
3202 if (!propagate_mount_busy(mnt, 1)) { in select_submounts()
3203 list_move_tail(&mnt->mnt_expire, graveyard); in select_submounts()
3224 static void shrink_submounts(struct mount *mnt) in shrink_submounts() argument
3230 while (select_submounts(mnt, &graveyard)) { in shrink_submounts()
3347 mnt_flags |= path->mnt->mnt_flags & MNT_ATIME_MASK; in path_mount()
3480 new = copy_tree(old, old->mnt.mnt_root, copy_flags); in copy_mnt_ns()
3505 if (&p->mnt == new_fs->root.mnt) { in copy_mnt_ns()
3506 new_fs->root.mnt = mntget(&q->mnt); in copy_mnt_ns()
3507 rootmnt = &p->mnt; in copy_mnt_ns()
3509 if (&p->mnt == new_fs->pwd.mnt) { in copy_mnt_ns()
3510 new_fs->pwd.mnt = mntget(&q->mnt); in copy_mnt_ns()
3511 pwdmnt = &p->mnt; in copy_mnt_ns()
3518 while (p->mnt.mnt_root != q->mnt.mnt_root) in copy_mnt_ns()
3533 struct mount *mnt = real_mount(m); in mount_subtree() local
3544 mnt->mnt_ns = ns; in mount_subtree()
3545 ns->root = mnt; in mount_subtree()
3547 list_add(&mnt->mnt_list, &ns->list); in mount_subtree()
3558 s = path.mnt->mnt_sb; in mount_subtree()
3560 mntput(path.mnt); in mount_subtree()
3643 struct mount *mnt; in SYSCALL_DEFINE3() local
3704 newmount.mnt = vfs_create_mount(fc); in SYSCALL_DEFINE3()
3705 if (IS_ERR(newmount.mnt)) { in SYSCALL_DEFINE3()
3706 ret = PTR_ERR(newmount.mnt); in SYSCALL_DEFINE3()
3710 newmount.mnt->mnt_flags = mnt_flags; in SYSCALL_DEFINE3()
3724 mnt = real_mount(newmount.mnt); in SYSCALL_DEFINE3()
3725 mnt->mnt_ns = ns; in SYSCALL_DEFINE3()
3726 ns->root = mnt; in SYSCALL_DEFINE3()
3728 list_add(&mnt->mnt_list, &ns->list); in SYSCALL_DEFINE3()
3729 mntget(newmount.mnt); in SYSCALL_DEFINE3()
3736 dissolve_on_fput(newmount.mnt); in SYSCALL_DEFINE3()
3823 bool is_path_reachable(struct mount *mnt, struct dentry *dentry, in is_path_reachable() argument
3826 while (&mnt->mnt != root->mnt && mnt_has_parent(mnt)) { in is_path_reachable()
3827 dentry = mnt->mnt_mountpoint; in is_path_reachable()
3828 mnt = mnt->mnt_parent; in is_path_reachable()
3830 return &mnt->mnt == root->mnt && is_subdir(dentry, root->dentry); in is_path_reachable()
3837 res = is_path_reachable(real_mount(path1->mnt), path1->dentry, path2); in path_is_under()
3900 new_mnt = real_mount(new.mnt); in SYSCALL_DEFINE2()
3901 root_mnt = real_mount(root.mnt); in SYSCALL_DEFINE2()
3902 old_mnt = real_mount(old.mnt); in SYSCALL_DEFINE2()
3911 if (new_mnt->mnt.mnt_flags & MNT_LOCKED) in SYSCALL_DEFINE2()
3920 if (root.mnt->mnt_root != root.dentry) in SYSCALL_DEFINE2()
3924 if (new.mnt->mnt_root != new.dentry) in SYSCALL_DEFINE2()
3937 if (root_mnt->mnt.mnt_flags & MNT_LOCKED) { in SYSCALL_DEFINE2()
3938 new_mnt->mnt.mnt_flags |= MNT_LOCKED; in SYSCALL_DEFINE2()
3939 root_mnt->mnt.mnt_flags &= ~MNT_LOCKED; in SYSCALL_DEFINE2()
3967 static unsigned int recalc_flags(struct mount_kattr *kattr, struct mount *mnt) in recalc_flags() argument
3969 unsigned int flags = mnt->mnt.mnt_flags; in recalc_flags()
3979 static int can_idmap_mount(const struct mount_kattr *kattr, struct mount *mnt) in can_idmap_mount() argument
3981 struct vfsmount *m = &mnt->mnt; in can_idmap_mount()
4011 if (!is_anon_ns(mnt->mnt_ns)) in can_idmap_mount()
4027 const struct mount *mnt) in mnt_allow_writers() argument
4030 (mnt->mnt.mnt_flags & MNT_READONLY)) && in mnt_allow_writers()
4034 static int mount_setattr_prepare(struct mount_kattr *kattr, struct mount *mnt) in mount_setattr_prepare() argument
4039 for (m = mnt; m; m = next_mnt(m, mnt)) { in mount_setattr_prepare()
4067 for (p = mnt; p; p = next_mnt(p, mnt)) { in mount_setattr_prepare()
4069 if (p->mnt.mnt_flags & MNT_WRITE_HOLD) in mount_setattr_prepare()
4083 static void do_idmap_mount(const struct mount_kattr *kattr, struct mount *mnt) in do_idmap_mount() argument
4094 old_mnt_userns = mnt->mnt.mnt_userns; in do_idmap_mount()
4098 smp_store_release(&mnt->mnt.mnt_userns, mnt_userns); in do_idmap_mount()
4108 static void mount_setattr_commit(struct mount_kattr *kattr, struct mount *mnt) in mount_setattr_commit() argument
4112 for (m = mnt; m; m = next_mnt(m, mnt)) { in mount_setattr_commit()
4117 WRITE_ONCE(m->mnt.mnt_flags, flags); in mount_setattr_commit()
4120 if (m->mnt.mnt_flags & MNT_WRITE_HOLD) in mount_setattr_commit()
4128 touch_mnt_namespace(mnt->mnt_ns); in mount_setattr_commit()
4133 struct mount *mnt = real_mount(path->mnt); in do_mount_setattr() local
4136 if (path->dentry != mnt->mnt.mnt_root) in do_mount_setattr()
4146 err = invent_group_ids(mnt, kattr->recurse); in do_mount_setattr()
4158 if (!is_mounted(&mnt->mnt)) in do_mount_setattr()
4167 if (!(mnt_has_parent(mnt) ? check_mnt(mnt) : is_anon_ns(mnt->mnt_ns))) in do_mount_setattr()
4175 err = mount_setattr_prepare(kattr, mnt); in do_mount_setattr()
4177 mount_setattr_commit(kattr, mnt); in do_mount_setattr()
4185 cleanup_group_ids(mnt, NULL); in do_mount_setattr()
4378 struct vfsmount *mnt; in init_mount_tree() local
4383 mnt = vfs_kern_mount(&rootfs_fs_type, 0, "rootfs", NULL); in init_mount_tree()
4384 if (IS_ERR(mnt)) in init_mount_tree()
4390 m = real_mount(mnt); in init_mount_tree()
4398 root.mnt = mnt; in init_mount_tree()
4399 root.dentry = mnt->mnt_root; in init_mount_tree()
4400 mnt->mnt_flags |= MNT_LOCKED; in init_mount_tree()
4445 drop_collected_mounts(&ns->root->mnt); in put_mnt_ns()
4451 struct vfsmount *mnt; in kern_mount() local
4452 mnt = vfs_kern_mount(type, SB_KERNMOUNT, type->name, NULL); in kern_mount()
4453 if (!IS_ERR(mnt)) { in kern_mount()
4458 real_mount(mnt)->mnt_ns = MNT_NS_INTERNAL; in kern_mount()
4460 return mnt; in kern_mount()
4464 void kern_unmount(struct vfsmount *mnt) in kern_unmount() argument
4467 if (!IS_ERR_OR_NULL(mnt)) { in kern_unmount()
4468 real_mount(mnt)->mnt_ns = NULL; in kern_unmount()
4470 mntput(mnt); in kern_unmount()
4475 void kern_unmount_array(struct vfsmount *mnt[], unsigned int num) in kern_unmount_array() argument
4480 if (mnt[i]) in kern_unmount_array()
4481 real_mount(mnt[i])->mnt_ns = NULL; in kern_unmount_array()
4484 mntput(mnt[i]); in kern_unmount_array()
4488 bool our_mnt(struct vfsmount *mnt) in our_mnt() argument
4490 return check_mnt(real_mount(mnt)); in our_mnt()
4501 ns_root.mnt = ¤t->nsproxy->mnt_ns->root->mnt; in current_chrooted()
4502 ns_root.dentry = ns_root.mnt->mnt_root; in current_chrooted()
4522 struct mount *mnt; in mnt_already_visible() local
4527 list_for_each_entry(mnt, &ns->list, mnt_list) { in mnt_already_visible()
4531 if (mnt_is_cursor(mnt)) in mnt_already_visible()
4534 if (mnt->mnt.mnt_sb->s_type != sb->s_type) in mnt_already_visible()
4540 if (mnt->mnt.mnt_root != mnt->mnt.mnt_sb->s_root) in mnt_already_visible()
4544 mnt_flags = mnt->mnt.mnt_flags; in mnt_already_visible()
4547 if (sb_rdonly(mnt->mnt.mnt_sb)) in mnt_already_visible()
4564 list_for_each_entry(child, &mnt->mnt_mounts, mnt_child) { in mnt_already_visible()
4567 if (!(child->mnt.mnt_flags & MNT_LOCKED)) in mnt_already_visible()
4609 bool mnt_may_suid(struct vfsmount *mnt) in mnt_may_suid() argument
4618 return !(mnt->mnt_flags & MNT_NOSUID) && check_mnt(real_mount(mnt)) && in mnt_may_suid()
4619 current_in_userns(mnt->mnt_sb->s_user_ns); in mnt_may_suid()
4668 err = vfs_path_lookup(mnt_ns->root->mnt.mnt_root, &mnt_ns->root->mnt, in mntns_install()