Lines Matching refs:mnt
112 static inline struct hlist_head *m_hash(struct vfsmount *mnt, struct dentry *dentry) in m_hash() argument
114 unsigned long tmp = ((unsigned long)mnt / L1_CACHE_BYTES); in m_hash()
127 static int mnt_alloc_id(struct mount *mnt) in mnt_alloc_id() argument
133 mnt->mnt_id = res; in mnt_alloc_id()
137 static void mnt_free_id(struct mount *mnt) in mnt_free_id() argument
139 ida_free(&mnt_id_ida, mnt->mnt_id); in mnt_free_id()
145 static int mnt_alloc_group_id(struct mount *mnt) in mnt_alloc_group_id() argument
151 mnt->mnt_group_id = res; in mnt_alloc_group_id()
158 void mnt_release_group_id(struct mount *mnt) in mnt_release_group_id() argument
160 ida_free(&mnt_group_ida, mnt->mnt_group_id); in mnt_release_group_id()
161 mnt->mnt_group_id = 0; in mnt_release_group_id()
167 static inline void mnt_add_count(struct mount *mnt, int n) in mnt_add_count() argument
170 this_cpu_add(mnt->mnt_pcp->mnt_count, n); in mnt_add_count()
173 mnt->mnt_count += n; in mnt_add_count()
181 int mnt_get_count(struct mount *mnt) in mnt_get_count() argument
188 count += per_cpu_ptr(mnt->mnt_pcp, cpu)->mnt_count; in mnt_get_count()
193 return mnt->mnt_count; in mnt_get_count()
199 struct mount *mnt = kmem_cache_zalloc(mnt_cache, GFP_KERNEL); in alloc_vfsmnt() local
200 if (mnt) { in alloc_vfsmnt()
203 err = mnt_alloc_id(mnt); in alloc_vfsmnt()
208 mnt->mnt_devname = kstrdup_const(name, in alloc_vfsmnt()
210 if (!mnt->mnt_devname) in alloc_vfsmnt()
215 mnt->mnt_pcp = alloc_percpu(struct mnt_pcp); in alloc_vfsmnt()
216 if (!mnt->mnt_pcp) in alloc_vfsmnt()
219 this_cpu_add(mnt->mnt_pcp->mnt_count, 1); in alloc_vfsmnt()
221 mnt->mnt_count = 1; in alloc_vfsmnt()
222 mnt->mnt_writers = 0; in alloc_vfsmnt()
225 INIT_HLIST_NODE(&mnt->mnt_hash); in alloc_vfsmnt()
226 INIT_LIST_HEAD(&mnt->mnt_child); in alloc_vfsmnt()
227 INIT_LIST_HEAD(&mnt->mnt_mounts); in alloc_vfsmnt()
228 INIT_LIST_HEAD(&mnt->mnt_list); in alloc_vfsmnt()
229 INIT_LIST_HEAD(&mnt->mnt_expire); in alloc_vfsmnt()
230 INIT_LIST_HEAD(&mnt->mnt_share); in alloc_vfsmnt()
231 INIT_LIST_HEAD(&mnt->mnt_slave_list); in alloc_vfsmnt()
232 INIT_LIST_HEAD(&mnt->mnt_slave); in alloc_vfsmnt()
233 INIT_HLIST_NODE(&mnt->mnt_mp_list); in alloc_vfsmnt()
234 INIT_LIST_HEAD(&mnt->mnt_umounting); in alloc_vfsmnt()
235 INIT_HLIST_HEAD(&mnt->mnt_stuck_children); in alloc_vfsmnt()
236 mnt->mnt.mnt_idmap = &nop_mnt_idmap; in alloc_vfsmnt()
238 return mnt; in alloc_vfsmnt()
242 kfree_const(mnt->mnt_devname); in alloc_vfsmnt()
245 mnt_free_id(mnt); in alloc_vfsmnt()
247 kmem_cache_free(mnt_cache, mnt); in alloc_vfsmnt()
270 bool __mnt_is_readonly(struct vfsmount *mnt) in __mnt_is_readonly() argument
272 return (mnt->mnt_flags & MNT_READONLY) || sb_rdonly(mnt->mnt_sb); in __mnt_is_readonly()
276 static inline void mnt_inc_writers(struct mount *mnt) in mnt_inc_writers() argument
279 this_cpu_inc(mnt->mnt_pcp->mnt_writers); in mnt_inc_writers()
281 mnt->mnt_writers++; in mnt_inc_writers()
285 static inline void mnt_dec_writers(struct mount *mnt) in mnt_dec_writers() argument
288 this_cpu_dec(mnt->mnt_pcp->mnt_writers); in mnt_dec_writers()
290 mnt->mnt_writers--; in mnt_dec_writers()
294 static unsigned int mnt_get_writers(struct mount *mnt) in mnt_get_writers() argument
301 count += per_cpu_ptr(mnt->mnt_pcp, cpu)->mnt_writers; in mnt_get_writers()
306 return mnt->mnt_writers; in mnt_get_writers()
310 static int mnt_is_readonly(struct vfsmount *mnt) in mnt_is_readonly() argument
312 if (READ_ONCE(mnt->mnt_sb->s_readonly_remount)) in mnt_is_readonly()
323 return __mnt_is_readonly(mnt); in mnt_is_readonly()
344 struct mount *mnt = real_mount(m); in __mnt_want_write() local
348 mnt_inc_writers(mnt); in __mnt_want_write()
356 while (READ_ONCE(mnt->mnt.mnt_flags) & MNT_WRITE_HOLD) { in __mnt_want_write()
382 mnt_dec_writers(mnt); in __mnt_want_write()
427 if (__mnt_is_readonly(file->f_path.mnt)) in __mnt_want_write_file()
431 return __mnt_want_write(file->f_path.mnt); in __mnt_want_write_file()
463 void __mnt_drop_write(struct vfsmount *mnt) in __mnt_drop_write() argument
466 mnt_dec_writers(real_mount(mnt)); in __mnt_drop_write()
478 void mnt_drop_write(struct vfsmount *mnt) in mnt_drop_write() argument
480 __mnt_drop_write(mnt); in mnt_drop_write()
481 sb_end_write(mnt->mnt_sb); in mnt_drop_write()
488 __mnt_drop_write(file->f_path.mnt); in __mnt_drop_write_file()
516 static inline int mnt_hold_writers(struct mount *mnt) in mnt_hold_writers() argument
518 mnt->mnt.mnt_flags |= MNT_WRITE_HOLD; in mnt_hold_writers()
541 if (mnt_get_writers(mnt) > 0) in mnt_hold_writers()
559 static inline void mnt_unhold_writers(struct mount *mnt) in mnt_unhold_writers() argument
566 mnt->mnt.mnt_flags &= ~MNT_WRITE_HOLD; in mnt_unhold_writers()
569 static int mnt_make_readonly(struct mount *mnt) in mnt_make_readonly() argument
573 ret = mnt_hold_writers(mnt); in mnt_make_readonly()
575 mnt->mnt.mnt_flags |= MNT_READONLY; in mnt_make_readonly()
576 mnt_unhold_writers(mnt); in mnt_make_readonly()
582 struct mount *mnt; in sb_prepare_remount_readonly() local
590 list_for_each_entry(mnt, &sb->s_mounts, mnt_instance) { in sb_prepare_remount_readonly()
591 if (!(mnt->mnt.mnt_flags & MNT_READONLY)) { in sb_prepare_remount_readonly()
592 err = mnt_hold_writers(mnt); in sb_prepare_remount_readonly()
602 list_for_each_entry(mnt, &sb->s_mounts, mnt_instance) { in sb_prepare_remount_readonly()
603 if (mnt->mnt.mnt_flags & MNT_WRITE_HOLD) in sb_prepare_remount_readonly()
604 mnt->mnt.mnt_flags &= ~MNT_WRITE_HOLD; in sb_prepare_remount_readonly()
611 static void free_vfsmnt(struct mount *mnt) in free_vfsmnt() argument
613 mnt_idmap_put(mnt_idmap(&mnt->mnt)); in free_vfsmnt()
614 kfree_const(mnt->mnt_devname); in free_vfsmnt()
616 free_percpu(mnt->mnt_pcp); in free_vfsmnt()
618 kmem_cache_free(mnt_cache, mnt); in free_vfsmnt()
629 struct mount *mnt; in __legitimize_mnt() local
634 mnt = real_mount(bastard); in __legitimize_mnt()
635 mnt_add_count(mnt, 1); in __legitimize_mnt()
640 mnt_add_count(mnt, -1); in __legitimize_mnt()
645 mnt_add_count(mnt, -1); in __legitimize_mnt()
688 struct mount *__lookup_mnt(struct vfsmount *mnt, struct dentry *dentry) in __lookup_mnt() argument
690 struct hlist_head *head = m_hash(mnt, dentry); in __lookup_mnt()
694 if (&p->mnt_parent->mnt == mnt && p->mnt_mountpoint == dentry) in __lookup_mnt()
724 child_mnt = __lookup_mnt(path->mnt, path->dentry); in lookup_mnt()
725 m = child_mnt ? &child_mnt->mnt : NULL; in lookup_mnt()
741 static inline bool mnt_is_cursor(struct mount *mnt) in mnt_is_cursor() argument
743 return mnt->mnt.mnt_flags & MNT_CURSOR; in mnt_is_cursor()
764 struct mount *mnt; in __is_local_mountpoint() local
769 list_for_each_entry(mnt, &ns->list, mnt_list) { in __is_local_mountpoint()
770 if (mnt_is_cursor(mnt)) in __is_local_mountpoint()
772 is_covered = (mnt->mnt_mountpoint == dentry); in __is_local_mountpoint()
870 static inline int check_mnt(struct mount *mnt) in check_mnt() argument
872 return mnt->mnt_ns == current->nsproxy->mnt_ns; in check_mnt()
900 static struct mountpoint *unhash_mnt(struct mount *mnt) in unhash_mnt() argument
903 mnt->mnt_parent = mnt; in unhash_mnt()
904 mnt->mnt_mountpoint = mnt->mnt.mnt_root; in unhash_mnt()
905 list_del_init(&mnt->mnt_child); in unhash_mnt()
906 hlist_del_init_rcu(&mnt->mnt_hash); in unhash_mnt()
907 hlist_del_init(&mnt->mnt_mp_list); in unhash_mnt()
908 mp = mnt->mnt_mp; in unhash_mnt()
909 mnt->mnt_mp = NULL; in unhash_mnt()
916 static void umount_mnt(struct mount *mnt) in umount_mnt() argument
918 put_mountpoint(unhash_mnt(mnt)); in umount_mnt()
924 void mnt_set_mountpoint(struct mount *mnt, in mnt_set_mountpoint() argument
929 mnt_add_count(mnt, 1); /* essentially, that's mntget */ in mnt_set_mountpoint()
931 child_mnt->mnt_parent = mnt; in mnt_set_mountpoint()
963 static void __attach_mnt(struct mount *mnt, struct mount *parent) in __attach_mnt() argument
965 hlist_add_head_rcu(&mnt->mnt_hash, in __attach_mnt()
966 m_hash(&parent->mnt, mnt->mnt_mountpoint)); in __attach_mnt()
967 list_add_tail(&mnt->mnt_child, &parent->mnt_mounts); in __attach_mnt()
992 static void attach_mnt(struct mount *mnt, struct mount *parent, in attach_mnt() argument
996 mnt_set_mountpoint_beneath(mnt, parent, mp); in attach_mnt()
998 mnt_set_mountpoint(parent, mp, mnt); in attach_mnt()
1005 __attach_mnt(mnt, mnt->mnt_parent); in attach_mnt()
1008 void mnt_change_mountpoint(struct mount *parent, struct mountpoint *mp, struct mount *mnt) in mnt_change_mountpoint() argument
1010 struct mountpoint *old_mp = mnt->mnt_mp; in mnt_change_mountpoint()
1011 struct mount *old_parent = mnt->mnt_parent; in mnt_change_mountpoint()
1013 list_del_init(&mnt->mnt_child); in mnt_change_mountpoint()
1014 hlist_del_init(&mnt->mnt_mp_list); in mnt_change_mountpoint()
1015 hlist_del_init_rcu(&mnt->mnt_hash); in mnt_change_mountpoint()
1017 attach_mnt(mnt, parent, mp, false); in mnt_change_mountpoint()
1026 static void commit_tree(struct mount *mnt) in commit_tree() argument
1028 struct mount *parent = mnt->mnt_parent; in commit_tree()
1033 BUG_ON(parent == mnt); in commit_tree()
1035 list_add_tail(&head, &mnt->mnt_list); in commit_tree()
1044 __attach_mnt(mnt, parent); in commit_tree()
1085 struct mount *mnt; in vfs_create_mount() local
1090 mnt = alloc_vfsmnt(fc->source ?: "none"); in vfs_create_mount()
1091 if (!mnt) in vfs_create_mount()
1095 mnt->mnt.mnt_flags = MNT_INTERNAL; in vfs_create_mount()
1098 mnt->mnt.mnt_sb = fc->root->d_sb; in vfs_create_mount()
1099 mnt->mnt.mnt_root = dget(fc->root); in vfs_create_mount()
1100 mnt->mnt_mountpoint = mnt->mnt.mnt_root; in vfs_create_mount()
1101 mnt->mnt_parent = mnt; in vfs_create_mount()
1104 list_add_tail(&mnt->mnt_instance, &mnt->mnt.mnt_sb->s_mounts); in vfs_create_mount()
1106 return &mnt->mnt; in vfs_create_mount()
1126 struct vfsmount *mnt; in vfs_kern_mount() local
1142 mnt = fc_mount(fc); in vfs_kern_mount()
1144 mnt = ERR_PTR(ret); in vfs_kern_mount()
1147 return mnt; in vfs_kern_mount()
1169 struct super_block *sb = old->mnt.mnt_sb; in clone_mnt()
1170 struct mount *mnt; in clone_mnt() local
1173 mnt = alloc_vfsmnt(old->mnt_devname); in clone_mnt()
1174 if (!mnt) in clone_mnt()
1178 mnt->mnt_group_id = 0; /* not a peer of original */ in clone_mnt()
1180 mnt->mnt_group_id = old->mnt_group_id; in clone_mnt()
1182 if ((flag & CL_MAKE_SHARED) && !mnt->mnt_group_id) { in clone_mnt()
1183 err = mnt_alloc_group_id(mnt); in clone_mnt()
1188 mnt->mnt.mnt_flags = old->mnt.mnt_flags; in clone_mnt()
1189 mnt->mnt.mnt_flags &= ~(MNT_WRITE_HOLD|MNT_MARKED|MNT_INTERNAL); in clone_mnt()
1192 mnt->mnt.mnt_idmap = mnt_idmap_get(mnt_idmap(&old->mnt)); in clone_mnt()
1194 mnt->mnt.mnt_sb = sb; in clone_mnt()
1195 mnt->mnt.mnt_root = dget(root); in clone_mnt()
1196 mnt->mnt_mountpoint = mnt->mnt.mnt_root; in clone_mnt()
1197 mnt->mnt_parent = mnt; in clone_mnt()
1199 list_add_tail(&mnt->mnt_instance, &sb->s_mounts); in clone_mnt()
1204 list_add(&mnt->mnt_slave, &old->mnt_slave_list); in clone_mnt()
1205 mnt->mnt_master = old; in clone_mnt()
1206 CLEAR_MNT_SHARED(mnt); in clone_mnt()
1209 list_add(&mnt->mnt_share, &old->mnt_share); in clone_mnt()
1211 list_add(&mnt->mnt_slave, &old->mnt_slave); in clone_mnt()
1212 mnt->mnt_master = old->mnt_master; in clone_mnt()
1214 CLEAR_MNT_SHARED(mnt); in clone_mnt()
1217 set_mnt_shared(mnt); in clone_mnt()
1223 list_add(&mnt->mnt_expire, &old->mnt_expire); in clone_mnt()
1226 return mnt; in clone_mnt()
1229 mnt_free_id(mnt); in clone_mnt()
1230 free_vfsmnt(mnt); in clone_mnt()
1234 static void cleanup_mnt(struct mount *mnt) in cleanup_mnt() argument
1245 WARN_ON(mnt_get_writers(mnt)); in cleanup_mnt()
1246 if (unlikely(mnt->mnt_pins.first)) in cleanup_mnt()
1247 mnt_pin_kill(mnt); in cleanup_mnt()
1248 hlist_for_each_entry_safe(m, p, &mnt->mnt_stuck_children, mnt_umount) { in cleanup_mnt()
1250 mntput(&m->mnt); in cleanup_mnt()
1252 fsnotify_vfsmount_delete(&mnt->mnt); in cleanup_mnt()
1253 dput(mnt->mnt.mnt_root); in cleanup_mnt()
1254 deactivate_super(mnt->mnt.mnt_sb); in cleanup_mnt()
1255 mnt_free_id(mnt); in cleanup_mnt()
1256 call_rcu(&mnt->mnt_rcu, delayed_free_vfsmnt); in cleanup_mnt()
1275 static void mntput_no_expire(struct mount *mnt) in mntput_no_expire() argument
1281 if (likely(READ_ONCE(mnt->mnt_ns))) { in mntput_no_expire()
1291 mnt_add_count(mnt, -1); in mntput_no_expire()
1301 mnt_add_count(mnt, -1); in mntput_no_expire()
1302 count = mnt_get_count(mnt); in mntput_no_expire()
1309 if (unlikely(mnt->mnt.mnt_flags & MNT_DOOMED)) { in mntput_no_expire()
1314 mnt->mnt.mnt_flags |= MNT_DOOMED; in mntput_no_expire()
1317 list_del(&mnt->mnt_instance); in mntput_no_expire()
1319 if (unlikely(!list_empty(&mnt->mnt_mounts))) { in mntput_no_expire()
1321 list_for_each_entry_safe(p, tmp, &mnt->mnt_mounts, mnt_child) { in mntput_no_expire()
1323 hlist_add_head(&p->mnt_umount, &mnt->mnt_stuck_children); in mntput_no_expire()
1329 if (likely(!(mnt->mnt.mnt_flags & MNT_INTERNAL))) { in mntput_no_expire()
1332 init_task_work(&mnt->mnt_rcu, __cleanup_mnt); in mntput_no_expire()
1333 if (!task_work_add(task, &mnt->mnt_rcu, TWA_RESUME)) in mntput_no_expire()
1336 if (llist_add(&mnt->mnt_llist, &delayed_mntput_list)) in mntput_no_expire()
1340 cleanup_mnt(mnt); in mntput_no_expire()
1343 void mntput(struct vfsmount *mnt) in mntput() argument
1345 if (mnt) { in mntput()
1346 struct mount *m = real_mount(mnt); in mntput()
1355 struct vfsmount *mntget(struct vfsmount *mnt) in mntget() argument
1357 if (mnt) in mntget()
1358 mnt_add_count(real_mount(mnt), 1); in mntget()
1359 return mnt; in mntget()
1368 void mnt_make_shortterm(struct vfsmount *mnt) in mnt_make_shortterm() argument
1370 if (mnt) in mnt_make_shortterm()
1371 real_mount(mnt)->mnt_ns = NULL; in mnt_make_shortterm()
1407 p = clone_mnt(real_mount(path->mnt), path->dentry, CL_PRIVATE); in mnt_clone_internal()
1410 p->mnt.mnt_flags |= MNT_INTERNAL; in mnt_clone_internal()
1411 return &p->mnt; in mnt_clone_internal()
1418 struct mount *mnt, *ret = NULL; in mnt_list_next() local
1422 mnt = list_entry(p, typeof(*mnt), mnt_list); in mnt_list_next()
1423 if (!mnt_is_cursor(mnt)) { in mnt_list_next()
1424 ret = mnt; in mnt_list_next()
1456 struct mount *mnt = v; in m_next() local
1459 return mnt_list_next(p->ns, &mnt->mnt_list); in m_next()
1465 struct mount *mnt = v; in m_stop() local
1468 if (mnt) in m_stop()
1469 list_move_tail(&p->cursor.mnt_list, &mnt->mnt_list); in m_stop()
1480 return p->show(m, &r->mnt); in m_show()
1510 struct mount *mnt = real_mount(m); in may_umount_tree() local
1518 for (p = mnt; p; p = next_mnt(p, mnt)) { in may_umount_tree()
1545 int may_umount(struct vfsmount *mnt) in may_umount() argument
1550 if (propagate_mount_busy(real_mount(mnt), 2)) in may_umount()
1580 mntput(&m->mnt); in namespace_unlock()
1595 static bool disconnect_mount(struct mount *mnt, enum umount_tree_flags how) in disconnect_mount() argument
1602 if (!mnt_has_parent(mnt)) in disconnect_mount()
1609 if (!(mnt->mnt_parent->mnt.mnt_flags & MNT_UMOUNT)) in disconnect_mount()
1617 if (IS_MNT_LOCKED(mnt)) in disconnect_mount()
1628 static void umount_tree(struct mount *mnt, enum umount_tree_flags how) in umount_tree() argument
1634 propagate_mount_unlock(mnt); in umount_tree()
1637 for (p = mnt; p; p = next_mnt(p, mnt)) { in umount_tree()
1638 p->mnt.mnt_flags |= MNT_UMOUNT; in umount_tree()
1664 p->mnt.mnt_flags |= MNT_SYNC_UMOUNT; in umount_tree()
1682 static void shrink_submounts(struct mount *mnt);
1707 static int do_umount(struct mount *mnt, int flags) in do_umount() argument
1709 struct super_block *sb = mnt->mnt.mnt_sb; in do_umount()
1712 retval = security_sb_umount(&mnt->mnt, flags); in do_umount()
1723 if (&mnt->mnt == current->fs->root.mnt || in do_umount()
1732 if (mnt_get_count(mnt) != 2) { in do_umount()
1738 if (!xchg(&mnt->mnt_expiry_mark, 1)) in do_umount()
1765 if (&mnt->mnt == current->fs->root.mnt && !(flags & MNT_DETACH)) { in do_umount()
1780 if (mnt->mnt.mnt_flags & MNT_LOCKED) in do_umount()
1785 if (!list_empty(&mnt->mnt_list)) in do_umount()
1786 umount_tree(mnt, UMOUNT_PROPAGATE); in do_umount()
1789 shrink_submounts(mnt); in do_umount()
1791 if (!propagate_mount_busy(mnt, 2)) { in do_umount()
1792 if (!list_empty(&mnt->mnt_list)) in do_umount()
1793 umount_tree(mnt, UMOUNT_PROPAGATE|UMOUNT_SYNC); in do_umount()
1816 struct mount *mnt; in __detach_mounts() local
1826 mnt = hlist_entry(mp->m_list.first, struct mount, mnt_mp_list); in __detach_mounts()
1827 if (mnt->mnt.mnt_flags & MNT_UMOUNT) { in __detach_mounts()
1828 umount_mnt(mnt); in __detach_mounts()
1829 hlist_add_head(&mnt->mnt_umount, &unmounted); in __detach_mounts()
1831 else umount_tree(mnt, UMOUNT_CONNECTED); in __detach_mounts()
1857 return path->mnt->mnt_root == path->dentry; in path_mounted()
1871 struct mount *mnt = real_mount(path->mnt); in can_umount() local
1877 if (!check_mnt(mnt)) in can_umount()
1879 if (mnt->mnt.mnt_flags & MNT_LOCKED) /* Check optimistically */ in can_umount()
1889 struct mount *mnt = real_mount(path->mnt); in path_umount() local
1894 ret = do_umount(mnt, flags); in path_umount()
1898 mntput_no_expire(mnt); in path_umount()
1949 struct ns_common *from_mnt_ns(struct mnt_namespace *mnt) in from_mnt_ns() argument
1951 return &mnt->ns; in from_mnt_ns()
1967 struct mount *copy_tree(struct mount *mnt, struct dentry *dentry, in copy_tree() argument
1972 if (!(flag & CL_COPY_UNBINDABLE) && IS_MNT_UNBINDABLE(mnt)) in copy_tree()
1978 res = q = clone_mnt(mnt, dentry, flag); in copy_tree()
1982 q->mnt_mountpoint = mnt->mnt_mountpoint; in copy_tree()
1984 p = mnt; in copy_tree()
1985 list_for_each_entry(r, &mnt->mnt_mounts, mnt_child) { in copy_tree()
1993 if (s->mnt.mnt_flags & MNT_LOCKED) { in copy_tree()
2003 is_mnt_ns_file(s->mnt.mnt_root)) { in copy_tree()
2013 q = clone_mnt(p, p->mnt.mnt_root, flag); in copy_tree()
2038 if (!check_mnt(real_mount(path->mnt))) in collect_mounts()
2041 tree = copy_tree(real_mount(path->mnt), path->dentry, in collect_mounts()
2046 return &tree->mnt; in collect_mounts()
2052 void dissolve_on_fput(struct vfsmount *mnt) in dissolve_on_fput() argument
2057 ns = real_mount(mnt)->mnt_ns; in dissolve_on_fput()
2060 umount_tree(real_mount(mnt), UMOUNT_CONNECTED); in dissolve_on_fput()
2070 void drop_collected_mounts(struct vfsmount *mnt) in drop_collected_mounts() argument
2074 umount_tree(real_mount(mnt), 0); in drop_collected_mounts()
2079 static bool has_locked_children(struct mount *mnt, struct dentry *dentry) in has_locked_children() argument
2083 list_for_each_entry(child, &mnt->mnt_mounts, mnt_child) { in has_locked_children()
2087 if (child->mnt.mnt_flags & MNT_LOCKED) in has_locked_children()
2105 struct mount *old_mnt = real_mount(path->mnt); in clone_private_mount()
2127 return &new_mnt->mnt; in clone_private_mount()
2138 struct mount *mnt; in iterate_mounts() local
2142 list_for_each_entry(mnt, &real_mount(root)->mnt_list, mnt_list) { in iterate_mounts()
2143 res = f(&mnt->mnt, arg); in iterate_mounts()
2150 static void lock_mnt_tree(struct mount *mnt) in lock_mnt_tree() argument
2154 for (p = mnt; p; p = next_mnt(p, mnt)) { in lock_mnt_tree()
2155 int flags = p->mnt.mnt_flags; in lock_mnt_tree()
2173 p->mnt.mnt_flags = flags; in lock_mnt_tree()
2177 static void cleanup_group_ids(struct mount *mnt, struct mount *end) in cleanup_group_ids() argument
2181 for (p = mnt; p != end; p = next_mnt(p, mnt)) { in cleanup_group_ids()
2187 static int invent_group_ids(struct mount *mnt, bool recurse) in invent_group_ids() argument
2191 for (p = mnt; p; p = recurse ? next_mnt(p, mnt) : NULL) { in invent_group_ids()
2195 cleanup_group_ids(mnt, p); in invent_group_ids()
2204 int count_mounts(struct mnt_namespace *ns, struct mount *mnt) in count_mounts() argument
2217 for (p = mnt; p; p = next_mnt(p, mnt)) in count_mounts()
2317 smp = get_mountpoint(source_mnt->mnt.mnt_root); in attach_recursive_mnt()
2369 q = __lookup_mnt(&child->mnt_parent->mnt, in attach_recursive_mnt()
2376 child->mnt.mnt_flags &= ~MNT_LOCKED; in attach_recursive_mnt()
2438 struct vfsmount *mnt = path->mnt; in do_lock_mount() local
2446 m = real_mount(mnt); in do_lock_mount()
2462 if (beneath && (!is_mounted(mnt) || m->mnt_mountpoint != dentry)) { in do_lock_mount()
2468 mnt = lookup_mnt(path); in do_lock_mount()
2469 if (likely(!mnt)) in do_lock_mount()
2477 path->mnt = mnt; in do_lock_mount()
2478 path->dentry = dget(mnt->mnt_root); in do_lock_mount()
2511 static int graft_tree(struct mount *mnt, struct mount *p, struct mountpoint *mp) in graft_tree() argument
2513 if (mnt->mnt.mnt_sb->s_flags & SB_NOUSER) in graft_tree()
2517 d_is_dir(mnt->mnt.mnt_root)) in graft_tree()
2520 return attach_recursive_mnt(mnt, p, mp, 0); in graft_tree()
2546 struct mount *mnt = real_mount(path->mnt); in do_change_type() local
2560 err = invent_group_ids(mnt, recurse); in do_change_type()
2566 for (m = mnt; m; m = (recurse ? next_mnt(m, mnt) : NULL)) in do_change_type()
2577 struct mount *mnt = ERR_PTR(-EINVAL), *old = real_mount(old_path->mnt); in __do_loopback() local
2580 return mnt; in __do_loopback()
2583 return mnt; in __do_loopback()
2586 return mnt; in __do_loopback()
2589 mnt = copy_tree(old, old_path->dentry, CL_COPY_MNT_NS_FILE); in __do_loopback()
2591 mnt = clone_mnt(old, old_path->dentry, 0); in __do_loopback()
2593 if (!IS_ERR(mnt)) in __do_loopback()
2594 mnt->mnt.mnt_flags &= ~MNT_LOCKED; in __do_loopback()
2596 return mnt; in __do_loopback()
2606 struct mount *mnt = NULL, *parent; in do_loopback() local
2625 parent = real_mount(path->mnt); in do_loopback()
2629 mnt = __do_loopback(&old_path, recurse); in do_loopback()
2630 if (IS_ERR(mnt)) { in do_loopback()
2631 err = PTR_ERR(mnt); in do_loopback()
2635 err = graft_tree(mnt, parent, mp); in do_loopback()
2638 umount_tree(mnt, UMOUNT_SYNC); in do_loopback()
2652 struct mount *mnt, *p; in open_detached_copy() local
2659 mnt = __do_loopback(path, recursive); in open_detached_copy()
2660 if (IS_ERR(mnt)) { in open_detached_copy()
2663 return ERR_CAST(mnt); in open_detached_copy()
2667 for (p = mnt; p; p = next_mnt(p, mnt)) { in open_detached_copy()
2671 ns->root = mnt; in open_detached_copy()
2672 list_add_tail(&ns->list, &mnt->mnt_list); in open_detached_copy()
2673 mntget(&mnt->mnt); in open_detached_copy()
2677 mntput(path->mnt); in open_detached_copy()
2678 path->mnt = &mnt->mnt; in open_detached_copy()
2681 dissolve_on_fput(path->mnt); in open_detached_copy()
2744 static bool can_change_locked_flags(struct mount *mnt, unsigned int mnt_flags) in can_change_locked_flags() argument
2746 unsigned int fl = mnt->mnt.mnt_flags; in can_change_locked_flags()
2771 static int change_mount_ro_state(struct mount *mnt, unsigned int mnt_flags) in change_mount_ro_state() argument
2775 if (readonly_request == __mnt_is_readonly(&mnt->mnt)) in change_mount_ro_state()
2779 return mnt_make_readonly(mnt); in change_mount_ro_state()
2781 mnt->mnt.mnt_flags &= ~MNT_READONLY; in change_mount_ro_state()
2785 static void set_mount_attributes(struct mount *mnt, unsigned int mnt_flags) in set_mount_attributes() argument
2787 mnt_flags |= mnt->mnt.mnt_flags & ~MNT_USER_SETTABLE_MASK; in set_mount_attributes()
2788 mnt->mnt.mnt_flags = mnt_flags; in set_mount_attributes()
2789 touch_mnt_namespace(mnt->mnt_ns); in set_mount_attributes()
2792 static void mnt_warn_timestamp_expiry(struct path *mountpoint, struct vfsmount *mnt) in mnt_warn_timestamp_expiry() argument
2794 struct super_block *sb = mnt->mnt_sb; in mnt_warn_timestamp_expiry()
2796 if (!__mnt_is_readonly(mnt) && in mnt_warn_timestamp_expiry()
2804 is_mounted(mnt) ? "remounted" : "mounted", in mnt_warn_timestamp_expiry()
2820 struct super_block *sb = path->mnt->mnt_sb; in do_reconfigure_mnt()
2821 struct mount *mnt = real_mount(path->mnt); in do_reconfigure_mnt() local
2824 if (!check_mnt(mnt)) in do_reconfigure_mnt()
2830 if (!can_change_locked_flags(mnt, mnt_flags)) in do_reconfigure_mnt()
2839 ret = change_mount_ro_state(mnt, mnt_flags); in do_reconfigure_mnt()
2841 set_mount_attributes(mnt, mnt_flags); in do_reconfigure_mnt()
2845 mnt_warn_timestamp_expiry(path, &mnt->mnt); in do_reconfigure_mnt()
2859 struct super_block *sb = path->mnt->mnt_sb; in do_remount()
2860 struct mount *mnt = real_mount(path->mnt); in do_remount() local
2863 if (!check_mnt(mnt)) in do_remount()
2869 if (!can_change_locked_flags(mnt, mnt_flags)) in do_remount()
2885 set_mount_attributes(mnt, mnt_flags); in do_remount()
2892 mnt_warn_timestamp_expiry(path, &mnt->mnt); in do_remount()
2898 static inline int tree_contains_unbindable(struct mount *mnt) in tree_contains_unbindable() argument
2901 for (p = mnt; p; p = next_mnt(p, mnt)) { in tree_contains_unbindable()
2921 if (mnt_ns_loop(p->mnt.mnt_root)) in check_for_nsfs_mounts()
2935 from = real_mount(from_path->mnt); in do_set_group()
2936 to = real_mount(to_path->mnt); in do_set_group()
2942 if (!is_mounted(&from->mnt)) in do_set_group()
2944 if (!is_mounted(&to->mnt)) in do_set_group()
2962 if (from->mnt.mnt_sb != to->mnt.mnt_sb) in do_set_group()
2966 if (!is_subdir(to->mnt.mnt_root, from->mnt.mnt_root)) in do_set_group()
2970 if (has_locked_children(from, to->mnt.mnt_root)) in do_set_group()
3015 if (unlikely(__lookup_mnt(path->mnt, path->dentry))) { in path_overmounted()
3047 struct mount *mnt_from = real_mount(from->mnt), in can_move_mount_beneath()
3048 *mnt_to = real_mount(to->mnt), in can_move_mount_beneath()
3068 if (&mnt_to->mnt == current->fs->root.mnt) in can_move_mount_beneath()
3120 old = real_mount(old_path->mnt); in do_move_mount()
3121 p = real_mount(new_path->mnt); in do_move_mount()
3135 if (!is_mounted(&old->mnt)) in do_move_mount()
3142 if (old->mnt.mnt_flags & MNT_LOCKED) in do_move_mount()
3180 err = attach_recursive_mnt(old, real_mount(new_path->mnt), mp, flags); in do_move_mount()
3223 struct mount *parent = real_mount(path->mnt); in do_add_mount()
3237 if (path->mnt->mnt_sb == newmnt->mnt.mnt_sb && path_mounted(path)) in do_add_mount()
3240 if (d_is_symlink(newmnt->mnt.mnt_root)) in do_add_mount()
3243 newmnt->mnt.mnt_flags = mnt_flags; in do_add_mount()
3256 struct vfsmount *mnt; in do_new_mount_fc() local
3272 mnt = vfs_create_mount(fc); in do_new_mount_fc()
3273 if (IS_ERR(mnt)) in do_new_mount_fc()
3274 return PTR_ERR(mnt); in do_new_mount_fc()
3276 mnt_warn_timestamp_expiry(mountpoint, mnt); in do_new_mount_fc()
3280 mntput(mnt); in do_new_mount_fc()
3283 error = do_add_mount(real_mount(mnt), mp, mountpoint, mnt_flags); in do_new_mount_fc()
3286 mntput(mnt); in do_new_mount_fc()
3347 struct mount *mnt; in finish_automount() local
3355 mnt = real_mount(m); in finish_automount()
3359 BUG_ON(mnt_get_count(mnt) < 2); in finish_automount()
3361 if (m->mnt_sb == path->mnt->mnt_sb && in finish_automount()
3388 err = do_add_mount(mnt, mp, path, path->mnt->mnt_flags | MNT_SHRINKABLE); in finish_automount()
3400 if (!list_empty(&mnt->mnt_expire)) { in finish_automount()
3402 list_del_init(&mnt->mnt_expire); in finish_automount()
3415 void mnt_set_expiry(struct vfsmount *mnt, struct list_head *expiry_list) in mnt_set_expiry() argument
3419 list_add_tail(&real_mount(mnt)->mnt_expire, expiry_list); in mnt_set_expiry()
3432 struct mount *mnt, *next; in mark_mounts_for_expiry() local
3447 list_for_each_entry_safe(mnt, next, mounts, mnt_expire) { in mark_mounts_for_expiry()
3448 if (!xchg(&mnt->mnt_expiry_mark, 1) || in mark_mounts_for_expiry()
3449 propagate_mount_busy(mnt, 1)) in mark_mounts_for_expiry()
3451 list_move(&mnt->mnt_expire, &graveyard); in mark_mounts_for_expiry()
3454 mnt = list_first_entry(&graveyard, struct mount, mnt_expire); in mark_mounts_for_expiry()
3455 touch_mnt_namespace(mnt->mnt_ns); in mark_mounts_for_expiry()
3456 umount_tree(mnt, UMOUNT_PROPAGATE|UMOUNT_SYNC); in mark_mounts_for_expiry()
3481 struct mount *mnt = list_entry(tmp, struct mount, mnt_child); in select_submounts() local
3484 if (!(mnt->mnt.mnt_flags & MNT_SHRINKABLE)) in select_submounts()
3489 if (!list_empty(&mnt->mnt_mounts)) { in select_submounts()
3490 this_parent = mnt; in select_submounts()
3494 if (!propagate_mount_busy(mnt, 1)) { in select_submounts()
3495 list_move_tail(&mnt->mnt_expire, graveyard); in select_submounts()
3516 static void shrink_submounts(struct mount *mnt) in shrink_submounts() argument
3522 while (select_submounts(mnt, &graveyard)) { in shrink_submounts()
3639 mnt_flags |= path->mnt->mnt_flags & MNT_ATIME_MASK; in path_mount()
3772 new = copy_tree(old, old->mnt.mnt_root, copy_flags); in copy_mnt_ns()
3797 if (&p->mnt == new_fs->root.mnt) { in copy_mnt_ns()
3798 new_fs->root.mnt = mntget(&q->mnt); in copy_mnt_ns()
3799 rootmnt = &p->mnt; in copy_mnt_ns()
3801 if (&p->mnt == new_fs->pwd.mnt) { in copy_mnt_ns()
3802 new_fs->pwd.mnt = mntget(&q->mnt); in copy_mnt_ns()
3803 pwdmnt = &p->mnt; in copy_mnt_ns()
3811 while (p->mnt.mnt_root != q->mnt.mnt_root) in copy_mnt_ns()
3826 struct mount *mnt = real_mount(m); in mount_subtree() local
3837 mnt->mnt_ns = ns; in mount_subtree()
3838 ns->root = mnt; in mount_subtree()
3840 list_add(&mnt->mnt_list, &ns->list); in mount_subtree()
3851 s = path.mnt->mnt_sb; in mount_subtree()
3853 mntput(path.mnt); in mount_subtree()
3936 struct mount *mnt; in SYSCALL_DEFINE3() local
3997 newmount.mnt = vfs_create_mount(fc); in SYSCALL_DEFINE3()
3998 if (IS_ERR(newmount.mnt)) { in SYSCALL_DEFINE3()
3999 ret = PTR_ERR(newmount.mnt); in SYSCALL_DEFINE3()
4003 newmount.mnt->mnt_flags = mnt_flags; in SYSCALL_DEFINE3()
4017 mnt = real_mount(newmount.mnt); in SYSCALL_DEFINE3()
4018 mnt->mnt_ns = ns; in SYSCALL_DEFINE3()
4019 ns->root = mnt; in SYSCALL_DEFINE3()
4021 list_add(&mnt->mnt_list, &ns->list); in SYSCALL_DEFINE3()
4022 mntget(newmount.mnt); in SYSCALL_DEFINE3()
4029 dissolve_on_fput(newmount.mnt); in SYSCALL_DEFINE3()
4121 bool is_path_reachable(struct mount *mnt, struct dentry *dentry, in is_path_reachable() argument
4124 while (&mnt->mnt != root->mnt && mnt_has_parent(mnt)) { in is_path_reachable()
4125 dentry = mnt->mnt_mountpoint; in is_path_reachable()
4126 mnt = mnt->mnt_parent; in is_path_reachable()
4128 return &mnt->mnt == root->mnt && is_subdir(dentry, root->dentry); in is_path_reachable()
4135 res = is_path_reachable(real_mount(path1->mnt), path1->dentry, path2); in path_is_under()
4198 new_mnt = real_mount(new.mnt); in SYSCALL_DEFINE2()
4199 root_mnt = real_mount(root.mnt); in SYSCALL_DEFINE2()
4200 old_mnt = real_mount(old.mnt); in SYSCALL_DEFINE2()
4209 if (new_mnt->mnt.mnt_flags & MNT_LOCKED) in SYSCALL_DEFINE2()
4235 if (root_mnt->mnt.mnt_flags & MNT_LOCKED) { in SYSCALL_DEFINE2()
4236 new_mnt->mnt.mnt_flags |= MNT_LOCKED; in SYSCALL_DEFINE2()
4237 root_mnt->mnt.mnt_flags &= ~MNT_LOCKED; in SYSCALL_DEFINE2()
4265 static unsigned int recalc_flags(struct mount_kattr *kattr, struct mount *mnt) in recalc_flags() argument
4267 unsigned int flags = mnt->mnt.mnt_flags; in recalc_flags()
4277 static int can_idmap_mount(const struct mount_kattr *kattr, struct mount *mnt) in can_idmap_mount() argument
4279 struct vfsmount *m = &mnt->mnt; in can_idmap_mount()
4309 if (!is_anon_ns(mnt->mnt_ns)) in can_idmap_mount()
4325 const struct mount *mnt) in mnt_allow_writers() argument
4328 (mnt->mnt.mnt_flags & MNT_READONLY)) && in mnt_allow_writers()
4332 static int mount_setattr_prepare(struct mount_kattr *kattr, struct mount *mnt) in mount_setattr_prepare() argument
4337 for (m = mnt; m; m = next_mnt(m, mnt)) { in mount_setattr_prepare()
4365 for (p = mnt; p; p = next_mnt(p, mnt)) { in mount_setattr_prepare()
4367 if (p->mnt.mnt_flags & MNT_WRITE_HOLD) in mount_setattr_prepare()
4381 static void do_idmap_mount(const struct mount_kattr *kattr, struct mount *mnt) in do_idmap_mount() argument
4394 smp_store_release(&mnt->mnt.mnt_idmap, mnt_idmap_get(kattr->mnt_idmap)); in do_idmap_mount()
4397 static void mount_setattr_commit(struct mount_kattr *kattr, struct mount *mnt) in mount_setattr_commit() argument
4401 for (m = mnt; m; m = next_mnt(m, mnt)) { in mount_setattr_commit()
4406 WRITE_ONCE(m->mnt.mnt_flags, flags); in mount_setattr_commit()
4409 if (m->mnt.mnt_flags & MNT_WRITE_HOLD) in mount_setattr_commit()
4417 touch_mnt_namespace(mnt->mnt_ns); in mount_setattr_commit()
4422 struct mount *mnt = real_mount(path->mnt); in do_mount_setattr() local
4444 err = invent_group_ids(mnt, kattr->recurse); in do_mount_setattr()
4456 if (!is_mounted(&mnt->mnt)) in do_mount_setattr()
4465 if (!(mnt_has_parent(mnt) ? check_mnt(mnt) : is_anon_ns(mnt->mnt_ns))) in do_mount_setattr()
4473 err = mount_setattr_prepare(kattr, mnt); in do_mount_setattr()
4475 mount_setattr_commit(kattr, mnt); in do_mount_setattr()
4482 cleanup_group_ids(mnt, NULL); in do_mount_setattr()
4679 struct vfsmount *mnt; in init_mount_tree() local
4684 mnt = vfs_kern_mount(&rootfs_fs_type, 0, "rootfs", NULL); in init_mount_tree()
4685 if (IS_ERR(mnt)) in init_mount_tree()
4691 m = real_mount(mnt); in init_mount_tree()
4699 root.mnt = mnt; in init_mount_tree()
4700 root.dentry = mnt->mnt_root; in init_mount_tree()
4701 mnt->mnt_flags |= MNT_LOCKED; in init_mount_tree()
4746 drop_collected_mounts(&ns->root->mnt); in put_mnt_ns()
4752 struct vfsmount *mnt; in kern_mount() local
4753 mnt = vfs_kern_mount(type, SB_KERNMOUNT, type->name, NULL); in kern_mount()
4754 if (!IS_ERR(mnt)) { in kern_mount()
4759 real_mount(mnt)->mnt_ns = MNT_NS_INTERNAL; in kern_mount()
4761 return mnt; in kern_mount()
4765 void kern_unmount(struct vfsmount *mnt) in kern_unmount() argument
4768 if (!IS_ERR(mnt)) { in kern_unmount()
4769 mnt_make_shortterm(mnt); in kern_unmount()
4771 mntput(mnt); in kern_unmount()
4776 void kern_unmount_array(struct vfsmount *mnt[], unsigned int num) in kern_unmount_array() argument
4781 mnt_make_shortterm(mnt[i]); in kern_unmount_array()
4784 mntput(mnt[i]); in kern_unmount_array()
4788 bool our_mnt(struct vfsmount *mnt) in our_mnt() argument
4790 return check_mnt(real_mount(mnt)); in our_mnt()
4801 ns_root.mnt = ¤t->nsproxy->mnt_ns->root->mnt; in current_chrooted()
4802 ns_root.dentry = ns_root.mnt->mnt_root; in current_chrooted()
4822 struct mount *mnt; in mnt_already_visible() local
4827 list_for_each_entry(mnt, &ns->list, mnt_list) { in mnt_already_visible()
4831 if (mnt_is_cursor(mnt)) in mnt_already_visible()
4834 if (mnt->mnt.mnt_sb->s_type != sb->s_type) in mnt_already_visible()
4840 if (mnt->mnt.mnt_root != mnt->mnt.mnt_sb->s_root) in mnt_already_visible()
4844 mnt_flags = mnt->mnt.mnt_flags; in mnt_already_visible()
4847 if (sb_rdonly(mnt->mnt.mnt_sb)) in mnt_already_visible()
4864 list_for_each_entry(child, &mnt->mnt_mounts, mnt_child) { in mnt_already_visible()
4867 if (!(child->mnt.mnt_flags & MNT_LOCKED)) in mnt_already_visible()
4909 bool mnt_may_suid(struct vfsmount *mnt) in mnt_may_suid() argument
4918 return !(mnt->mnt_flags & MNT_NOSUID) && check_mnt(real_mount(mnt)) && in mnt_may_suid()
4919 current_in_userns(mnt->mnt_sb->s_user_ns); in mnt_may_suid()
4968 err = vfs_path_lookup(mnt_ns->root->mnt.mnt_root, &mnt_ns->root->mnt, in mntns_install()