Lines Matching +full:2 +full:nd
501 #define EMBEDDED_LEVELS 2
527 #define ND_ROOT_GRABBED 2
555 static bool nd_alloc_stack(struct nameidata *nd) in nd_alloc_stack() argument
560 nd->flags & LOOKUP_RCU ? GFP_ATOMIC : GFP_KERNEL); in nd_alloc_stack()
563 memcpy(p, nd->internal, sizeof(nd->internal)); in nd_alloc_stack()
564 nd->stack = p; in nd_alloc_stack()
585 static void drop_links(struct nameidata *nd) in drop_links() argument
587 int i = nd->depth; in drop_links()
589 struct saved *last = nd->stack + i; in drop_links()
595 static void terminate_walk(struct nameidata *nd) in terminate_walk() argument
597 drop_links(nd); in terminate_walk()
598 if (!(nd->flags & LOOKUP_RCU)) { in terminate_walk()
600 path_put(&nd->path); in terminate_walk()
601 for (i = 0; i < nd->depth; i++) in terminate_walk()
602 path_put(&nd->stack[i].link); in terminate_walk()
603 if (nd->state & ND_ROOT_GRABBED) { in terminate_walk()
604 path_put(&nd->root); in terminate_walk()
605 nd->state &= ~ND_ROOT_GRABBED; in terminate_walk()
608 nd->flags &= ~LOOKUP_RCU; in terminate_walk()
611 nd->depth = 0; in terminate_walk()
612 nd->path.mnt = NULL; in terminate_walk()
613 nd->path.dentry = NULL; in terminate_walk()
633 static inline bool legitimize_path(struct nameidata *nd, in legitimize_path() argument
636 return __legitimize_path(path, seq, nd->m_seq); in legitimize_path()
639 static bool legitimize_links(struct nameidata *nd) in legitimize_links() argument
642 if (unlikely(nd->flags & LOOKUP_CACHED)) { in legitimize_links()
643 drop_links(nd); in legitimize_links()
644 nd->depth = 0; in legitimize_links()
647 for (i = 0; i < nd->depth; i++) { in legitimize_links()
648 struct saved *last = nd->stack + i; in legitimize_links()
649 if (unlikely(!legitimize_path(nd, &last->link, last->seq))) { in legitimize_links()
650 drop_links(nd); in legitimize_links()
651 nd->depth = i + 1; in legitimize_links()
658 static bool legitimize_root(struct nameidata *nd) in legitimize_root() argument
661 * For scoped-lookups (where nd->root has been zeroed), we need to in legitimize_root()
663 * for these lookups (nd->dfd is the root, not the filesystem root). in legitimize_root()
665 if (!nd->root.mnt && (nd->flags & LOOKUP_IS_SCOPED)) in legitimize_root()
667 /* Nothing to do if nd->root is zero or is managed by the VFS user. */ in legitimize_root()
668 if (!nd->root.mnt || (nd->state & ND_ROOT_PRESET)) in legitimize_root()
670 nd->state |= ND_ROOT_GRABBED; in legitimize_root()
671 return legitimize_path(nd, &nd->root, nd->root_seq); in legitimize_root()
675 * Path walking has 2 modes, rcu-walk and ref-walk (see
687 * @nd: nameidata pathwalk data
690 * try_to_unlazy attempts to legitimize the current nd->path and nd->root
696 static bool try_to_unlazy(struct nameidata *nd) in try_to_unlazy() argument
698 struct dentry *parent = nd->path.dentry; in try_to_unlazy()
700 BUG_ON(!(nd->flags & LOOKUP_RCU)); in try_to_unlazy()
702 nd->flags &= ~LOOKUP_RCU; in try_to_unlazy()
703 if (unlikely(!legitimize_links(nd))) in try_to_unlazy()
705 if (unlikely(!legitimize_path(nd, &nd->path, nd->seq))) in try_to_unlazy()
707 if (unlikely(!legitimize_root(nd))) in try_to_unlazy()
710 BUG_ON(nd->inode != parent->d_inode); in try_to_unlazy()
714 nd->path.mnt = NULL; in try_to_unlazy()
715 nd->path.dentry = NULL; in try_to_unlazy()
723 * @nd: nameidata pathwalk data
730 * nd->path and nd->root for ref-walk mode. Must be called from rcu-walk context.
734 static bool try_to_unlazy_next(struct nameidata *nd, struct dentry *dentry, unsigned seq) in try_to_unlazy_next() argument
736 BUG_ON(!(nd->flags & LOOKUP_RCU)); in try_to_unlazy_next()
738 nd->flags &= ~LOOKUP_RCU; in try_to_unlazy_next()
739 if (unlikely(!legitimize_links(nd))) in try_to_unlazy_next()
741 if (unlikely(!legitimize_mnt(nd->path.mnt, nd->m_seq))) in try_to_unlazy_next()
743 if (unlikely(!lockref_get_not_dead(&nd->path.dentry->d_lockref))) in try_to_unlazy_next()
761 if (unlikely(!legitimize_root(nd))) in try_to_unlazy_next()
767 nd->path.mnt = NULL; in try_to_unlazy_next()
769 nd->path.dentry = NULL; in try_to_unlazy_next()
789 * @nd: pointer nameidata
791 * If we had been in RCU mode, drop out of it and legitimize nd->path.
795 * need to drop nd->path.
797 static int complete_walk(struct nameidata *nd) in complete_walk() argument
799 struct dentry *dentry = nd->path.dentry; in complete_walk()
802 if (nd->flags & LOOKUP_RCU) { in complete_walk()
804 * We don't want to zero nd->root for scoped-lookups or in complete_walk()
805 * externally-managed nd->root. in complete_walk()
807 if (!(nd->state & ND_ROOT_PRESET)) in complete_walk()
808 if (!(nd->flags & LOOKUP_IS_SCOPED)) in complete_walk()
809 nd->root.mnt = NULL; in complete_walk()
810 nd->flags &= ~LOOKUP_CACHED; in complete_walk()
811 if (!try_to_unlazy(nd)) in complete_walk()
815 if (unlikely(nd->flags & LOOKUP_IS_SCOPED)) { in complete_walk()
832 if (!path_is_under(&nd->path, &nd->root)) in complete_walk()
836 if (likely(!(nd->state & ND_JUMPED))) in complete_walk()
842 status = dentry->d_op->d_weak_revalidate(dentry, nd->flags); in complete_walk()
852 static int set_root(struct nameidata *nd) in set_root() argument
861 if (WARN_ON(nd->flags & LOOKUP_IS_SCOPED)) in set_root()
864 if (nd->flags & LOOKUP_RCU) { in set_root()
869 nd->root = fs->root; in set_root()
870 nd->root_seq = __read_seqcount_begin(&nd->root.dentry->d_seq); in set_root()
873 get_fs_root(fs, &nd->root); in set_root()
874 nd->state |= ND_ROOT_GRABBED; in set_root()
879 static int nd_jump_root(struct nameidata *nd) in nd_jump_root() argument
881 if (unlikely(nd->flags & LOOKUP_BENEATH)) in nd_jump_root()
883 if (unlikely(nd->flags & LOOKUP_NO_XDEV)) { in nd_jump_root()
885 if (nd->path.mnt != NULL && nd->path.mnt != nd->root.mnt) in nd_jump_root()
888 if (!nd->root.mnt) { in nd_jump_root()
889 int error = set_root(nd); in nd_jump_root()
893 if (nd->flags & LOOKUP_RCU) { in nd_jump_root()
895 nd->path = nd->root; in nd_jump_root()
896 d = nd->path.dentry; in nd_jump_root()
897 nd->inode = d->d_inode; in nd_jump_root()
898 nd->seq = nd->root_seq; in nd_jump_root()
899 if (unlikely(read_seqcount_retry(&d->d_seq, nd->seq))) in nd_jump_root()
902 path_put(&nd->path); in nd_jump_root()
903 nd->path = nd->root; in nd_jump_root()
904 path_get(&nd->path); in nd_jump_root()
905 nd->inode = nd->path.dentry->d_inode; in nd_jump_root()
907 nd->state |= ND_JUMPED; in nd_jump_root()
918 struct nameidata *nd = current->nameidata; in nd_jump_link() local
920 if (unlikely(nd->flags & LOOKUP_NO_MAGICLINKS)) in nd_jump_link()
924 if (unlikely(nd->flags & LOOKUP_NO_XDEV)) { in nd_jump_link()
925 if (nd->path.mnt != path->mnt) in nd_jump_link()
929 if (unlikely(nd->flags & LOOKUP_IS_SCOPED)) in nd_jump_link()
932 path_put(&nd->path); in nd_jump_link()
933 nd->path = *path; in nd_jump_link()
934 nd->inode = nd->path.dentry->d_inode; in nd_jump_link()
935 nd->state |= ND_JUMPED; in nd_jump_link()
943 static inline void put_link(struct nameidata *nd) in put_link() argument
945 struct saved *last = nd->stack + --nd->depth; in put_link()
947 if (!(nd->flags & LOOKUP_RCU)) in put_link()
958 * @nd: nameidata pathwalk data
971 static inline int may_follow_link(struct nameidata *nd, const struct inode *inode) in may_follow_link() argument
981 if ((nd->dir_mode & (S_ISVTX|S_IWOTH)) != (S_ISVTX|S_IWOTH)) in may_follow_link()
985 if (uid_valid(nd->dir_uid) && uid_eq(nd->dir_uid, inode->i_uid)) in may_follow_link()
988 if (nd->flags & LOOKUP_RCU) in may_follow_link()
991 audit_inode(nd->name, nd->stack[0].link.dentry, 0); in may_follow_link()
1079 * If the sysctl_protected_fifos (or sysctl_protected_regular) is set to 2
1097 ((sysctl_protected_fifos >= 2 && S_ISFIFO(inode->i_mode)) || in may_create_in_sticky()
1098 (sysctl_protected_regular >= 2 && S_ISREG(inode->i_mode))))) { in may_create_in_sticky()
1328 static bool __follow_mount_rcu(struct nameidata *nd, struct path *path, in __follow_mount_rcu() argument
1337 if (unlikely(nd->flags & LOOKUP_NO_XDEV)) in __follow_mount_rcu()
1357 nd->state |= ND_JUMPED; in __follow_mount_rcu()
1367 if (read_seqretry(&mount_lock, nd->m_seq)) in __follow_mount_rcu()
1371 if (read_seqretry(&mount_lock, nd->m_seq)) in __follow_mount_rcu()
1378 static inline int handle_mounts(struct nameidata *nd, struct dentry *dentry, in handle_mounts() argument
1385 path->mnt = nd->path.mnt; in handle_mounts()
1387 if (nd->flags & LOOKUP_RCU) { in handle_mounts()
1391 if (likely(__follow_mount_rcu(nd, path, inode, seqp))) in handle_mounts()
1393 if (!try_to_unlazy_next(nd, dentry, seq)) in handle_mounts()
1396 path->mnt = nd->path.mnt; in handle_mounts()
1399 ret = traverse_mounts(path, &jumped, &nd->total_link_count, nd->flags); in handle_mounts()
1401 if (unlikely(nd->flags & LOOKUP_NO_XDEV)) in handle_mounts()
1404 nd->state |= ND_JUMPED; in handle_mounts()
1408 if (path->mnt != nd->path.mnt) in handle_mounts()
1471 static struct dentry *lookup_fast(struct nameidata *nd, in lookup_fast() argument
1475 struct dentry *dentry, *parent = nd->path.dentry; in lookup_fast()
1483 if (nd->flags & LOOKUP_RCU) { in lookup_fast()
1485 dentry = __d_lookup_rcu(parent, &nd->last, &seq); in lookup_fast()
1487 if (!try_to_unlazy(nd)) in lookup_fast()
1507 if (unlikely(__read_seqcount_retry(&parent->d_seq, nd->seq))) in lookup_fast()
1511 status = d_revalidate(dentry, nd->flags); in lookup_fast()
1514 if (!try_to_unlazy_next(nd, dentry, seq)) in lookup_fast()
1518 status = d_revalidate(dentry, nd->flags); in lookup_fast()
1520 dentry = __d_lookup(parent, &nd->last); in lookup_fast()
1523 status = d_revalidate(dentry, nd->flags); in lookup_fast()
1584 static inline int may_lookup(struct nameidata *nd) in may_lookup() argument
1586 if (nd->flags & LOOKUP_RCU) { in may_lookup()
1587 int err = inode_permission(nd->inode, MAY_EXEC|MAY_NOT_BLOCK); in may_lookup()
1588 if (err != -ECHILD || !try_to_unlazy(nd)) in may_lookup()
1591 return inode_permission(nd->inode, MAY_EXEC); in may_lookup()
1594 static int reserve_stack(struct nameidata *nd, struct path *link, unsigned seq) in reserve_stack() argument
1596 if (unlikely(nd->total_link_count++ >= MAXSYMLINKS)) in reserve_stack()
1599 if (likely(nd->depth != EMBEDDED_LEVELS)) in reserve_stack()
1601 if (likely(nd->stack != nd->internal)) in reserve_stack()
1603 if (likely(nd_alloc_stack(nd))) in reserve_stack()
1606 if (nd->flags & LOOKUP_RCU) { in reserve_stack()
1609 bool grabbed_link = legitimize_path(nd, link, seq); in reserve_stack()
1611 if (!try_to_unlazy(nd) != 0 || !grabbed_link) in reserve_stack()
1614 if (nd_alloc_stack(nd)) in reserve_stack()
1620 enum {WALK_TRAILING = 1, WALK_MORE = 2, WALK_NOFOLLOW = 4};
1622 static const char *pick_link(struct nameidata *nd, struct path *link, in pick_link() argument
1627 int error = reserve_stack(nd, link, seq); in pick_link()
1630 if (!(nd->flags & LOOKUP_RCU)) in pick_link()
1634 last = nd->stack + nd->depth++; in pick_link()
1640 error = may_follow_link(nd, inode); in pick_link()
1645 if (unlikely(nd->flags & LOOKUP_NO_SYMLINKS) || in pick_link()
1649 if (!(nd->flags & LOOKUP_RCU)) { in pick_link()
1653 if (!try_to_unlazy(nd)) in pick_link()
1659 nd->flags & LOOKUP_RCU); in pick_link()
1668 if (nd->flags & LOOKUP_RCU) { in pick_link()
1670 if (res == ERR_PTR(-ECHILD) && try_to_unlazy(nd)) in pick_link()
1681 error = nd_jump_root(nd); in pick_link()
1690 put_link(nd); in pick_link()
1700 static const char *step_into(struct nameidata *nd, int flags, in step_into() argument
1704 int err = handle_mounts(nd, dentry, &path, &inode, &seq); in step_into()
1709 ((flags & WALK_TRAILING) && !(nd->flags & LOOKUP_FOLLOW)) || in step_into()
1712 if (!(nd->flags & LOOKUP_RCU)) { in step_into()
1713 dput(nd->path.dentry); in step_into()
1714 if (nd->path.mnt != path.mnt) in step_into()
1715 mntput(nd->path.mnt); in step_into()
1717 nd->path = path; in step_into()
1718 nd->inode = inode; in step_into()
1719 nd->seq = seq; in step_into()
1722 if (nd->flags & LOOKUP_RCU) { in step_into()
1727 if (path.mnt == nd->path.mnt) in step_into()
1730 return pick_link(nd, &path, inode, seq, flags); in step_into()
1733 static struct dentry *follow_dotdot_rcu(struct nameidata *nd, in follow_dotdot_rcu() argument
1739 if (path_equal(&nd->path, &nd->root)) in follow_dotdot_rcu()
1741 if (unlikely(nd->path.dentry == nd->path.mnt->mnt_root)) { in follow_dotdot_rcu()
1744 if (!choose_mountpoint_rcu(real_mount(nd->path.mnt), in follow_dotdot_rcu()
1745 &nd->root, &path, &seq)) in follow_dotdot_rcu()
1747 if (unlikely(nd->flags & LOOKUP_NO_XDEV)) in follow_dotdot_rcu()
1749 nd->path = path; in follow_dotdot_rcu()
1750 nd->inode = path.dentry->d_inode; in follow_dotdot_rcu()
1751 nd->seq = seq; in follow_dotdot_rcu()
1752 if (unlikely(read_seqretry(&mount_lock, nd->m_seq))) in follow_dotdot_rcu()
1756 old = nd->path.dentry; in follow_dotdot_rcu()
1760 if (unlikely(read_seqcount_retry(&old->d_seq, nd->seq))) in follow_dotdot_rcu()
1762 if (unlikely(!path_connected(nd->path.mnt, parent))) in follow_dotdot_rcu()
1766 if (unlikely(read_seqretry(&mount_lock, nd->m_seq))) in follow_dotdot_rcu()
1768 if (unlikely(nd->flags & LOOKUP_BENEATH)) in follow_dotdot_rcu()
1773 static struct dentry *follow_dotdot(struct nameidata *nd, in follow_dotdot() argument
1779 if (path_equal(&nd->path, &nd->root)) in follow_dotdot()
1781 if (unlikely(nd->path.dentry == nd->path.mnt->mnt_root)) { in follow_dotdot()
1784 if (!choose_mountpoint(real_mount(nd->path.mnt), in follow_dotdot()
1785 &nd->root, &path)) in follow_dotdot()
1787 path_put(&nd->path); in follow_dotdot()
1788 nd->path = path; in follow_dotdot()
1789 nd->inode = path.dentry->d_inode; in follow_dotdot()
1790 if (unlikely(nd->flags & LOOKUP_NO_XDEV)) in follow_dotdot()
1794 parent = dget_parent(nd->path.dentry); in follow_dotdot()
1795 if (unlikely(!path_connected(nd->path.mnt, parent))) { in follow_dotdot()
1804 if (unlikely(nd->flags & LOOKUP_BENEATH)) in follow_dotdot()
1806 dget(nd->path.dentry); in follow_dotdot()
1810 static const char *handle_dots(struct nameidata *nd, int type) in handle_dots() argument
1818 if (!nd->root.mnt) { in handle_dots()
1819 error = ERR_PTR(set_root(nd)); in handle_dots()
1823 if (nd->flags & LOOKUP_RCU) in handle_dots()
1824 parent = follow_dotdot_rcu(nd, &inode, &seq); in handle_dots()
1826 parent = follow_dotdot(nd, &inode, &seq); in handle_dots()
1830 error = step_into(nd, WALK_NOFOLLOW, in handle_dots()
1831 nd->path.dentry, nd->inode, nd->seq); in handle_dots()
1833 error = step_into(nd, WALK_NOFOLLOW, in handle_dots()
1838 if (unlikely(nd->flags & LOOKUP_IS_SCOPED)) { in handle_dots()
1842 * above nd->root (and so userspace should retry or use in handle_dots()
1846 if (unlikely(__read_seqcount_retry(&mount_lock.seqcount, nd->m_seq))) in handle_dots()
1848 if (unlikely(__read_seqcount_retry(&rename_lock.seqcount, nd->r_seq))) in handle_dots()
1855 static const char *walk_component(struct nameidata *nd, int flags) in walk_component() argument
1865 if (unlikely(nd->last_type != LAST_NORM)) { in walk_component()
1866 if (!(flags & WALK_MORE) && nd->depth) in walk_component()
1867 put_link(nd); in walk_component()
1868 return handle_dots(nd, nd->last_type); in walk_component()
1870 dentry = lookup_fast(nd, &inode, &seq); in walk_component()
1874 dentry = lookup_slow(&nd->last, nd->path.dentry, nd->flags); in walk_component()
1878 if (!(flags & WALK_MORE) && nd->depth) in walk_component()
1879 put_link(nd); in walk_component()
1880 return step_into(nd, flags, dentry, inode, seq); in walk_component()
1918 * influence out to 2^6 = 64 state bits.
1921 * deltas or 64*63/2 = 2016 two-bit input deltas, and finding the
1930 * Input delta: 1-bit 2-bit
1932 * 2 rounds: 2753.7 140389.8
1936 * (64*128) (64*63/2 * 128)
1960 * Input delta: 1-bit 2-bit
1962 * 2 rounds: 1246.4 25475.4
1966 * (32*64) (32*31/2 * 64)
2116 * Returns 0 and nd will have valid dentry and mnt on success.
2119 static int link_path_walk(const char *name, struct nameidata *nd) in link_path_walk() argument
2121 int depth = 0; // depth <= nd->depth in link_path_walk()
2124 nd->last_type = LAST_ROOT; in link_path_walk()
2125 nd->flags |= LOOKUP_PARENT; in link_path_walk()
2139 err = may_lookup(nd); in link_path_walk()
2143 hash_len = hash_name(nd->path.dentry, name); in link_path_walk()
2147 case 2: in link_path_walk()
2150 nd->state |= ND_JUMPED; in link_path_walk()
2157 struct dentry *parent = nd->path.dentry; in link_path_walk()
2158 nd->state &= ~ND_JUMPED; in link_path_walk()
2169 nd->last.hash_len = hash_len; in link_path_walk()
2170 nd->last.name = name; in link_path_walk()
2171 nd->last_type = type; in link_path_walk()
2187 nd->dir_uid = nd->inode->i_uid; in link_path_walk()
2188 nd->dir_mode = nd->inode->i_mode; in link_path_walk()
2189 nd->flags &= ~LOOKUP_PARENT; in link_path_walk()
2193 name = nd->stack[--depth].name; in link_path_walk()
2194 link = walk_component(nd, 0); in link_path_walk()
2197 link = walk_component(nd, WALK_MORE); in link_path_walk()
2203 nd->stack[depth++].name = name; in link_path_walk()
2207 if (unlikely(!d_can_lookup(nd->path.dentry))) { in link_path_walk()
2208 if (nd->flags & LOOKUP_RCU) { in link_path_walk()
2209 if (!try_to_unlazy(nd)) in link_path_walk()
2218 static const char *path_init(struct nameidata *nd, unsigned flags) in path_init() argument
2221 const char *s = nd->name->name; in path_init()
2232 nd->flags = flags; in path_init()
2233 nd->state |= ND_JUMPED; in path_init()
2234 nd->depth = 0; in path_init()
2236 nd->m_seq = __read_seqcount_begin(&mount_lock.seqcount); in path_init()
2237 nd->r_seq = __read_seqcount_begin(&rename_lock.seqcount); in path_init()
2240 if (nd->state & ND_ROOT_PRESET) { in path_init()
2241 struct dentry *root = nd->root.dentry; in path_init()
2245 nd->path = nd->root; in path_init()
2246 nd->inode = inode; in path_init()
2248 nd->seq = read_seqcount_begin(&nd->path.dentry->d_seq); in path_init()
2249 nd->root_seq = nd->seq; in path_init()
2251 path_get(&nd->path); in path_init()
2256 nd->root.mnt = NULL; in path_init()
2258 /* Absolute pathname -- fetch the root (LOOKUP_IN_ROOT uses nd->dfd). */ in path_init()
2260 error = nd_jump_root(nd); in path_init()
2267 if (nd->dfd == AT_FDCWD) { in path_init()
2274 nd->path = fs->pwd; in path_init()
2275 nd->inode = nd->path.dentry->d_inode; in path_init()
2276 nd->seq = __read_seqcount_begin(&nd->path.dentry->d_seq); in path_init()
2279 get_fs_pwd(current->fs, &nd->path); in path_init()
2280 nd->inode = nd->path.dentry->d_inode; in path_init()
2284 struct fd f = fdget_raw(nd->dfd); in path_init()
2297 nd->path = f.file->f_path; in path_init()
2299 nd->inode = nd->path.dentry->d_inode; in path_init()
2300 nd->seq = read_seqcount_begin(&nd->path.dentry->d_seq); in path_init()
2302 path_get(&nd->path); in path_init()
2303 nd->inode = nd->path.dentry->d_inode; in path_init()
2310 nd->root = nd->path; in path_init()
2312 nd->root_seq = nd->seq; in path_init()
2314 path_get(&nd->root); in path_init()
2315 nd->state |= ND_ROOT_GRABBED; in path_init()
2321 static inline const char *lookup_last(struct nameidata *nd) in lookup_last() argument
2323 if (nd->last_type == LAST_NORM && nd->last.name[nd->last.len]) in lookup_last()
2324 nd->flags |= LOOKUP_FOLLOW | LOOKUP_DIRECTORY; in lookup_last()
2326 return walk_component(nd, WALK_TRAILING); in lookup_last()
2329 static int handle_lookup_down(struct nameidata *nd) in handle_lookup_down() argument
2331 if (!(nd->flags & LOOKUP_RCU)) in handle_lookup_down()
2332 dget(nd->path.dentry); in handle_lookup_down()
2333 return PTR_ERR(step_into(nd, WALK_NOFOLLOW, in handle_lookup_down()
2334 nd->path.dentry, nd->inode, nd->seq)); in handle_lookup_down()
2337 /* Returns 0 and nd will be valid on success; Retuns error, otherwise. */
2338 static int path_lookupat(struct nameidata *nd, unsigned flags, struct path *path) in path_lookupat() argument
2340 const char *s = path_init(nd, flags); in path_lookupat()
2344 err = handle_lookup_down(nd); in path_lookupat()
2349 while (!(err = link_path_walk(s, nd)) && in path_lookupat()
2350 (s = lookup_last(nd)) != NULL) in path_lookupat()
2352 if (!err && unlikely(nd->flags & LOOKUP_MOUNTPOINT)) { in path_lookupat()
2353 err = handle_lookup_down(nd); in path_lookupat()
2354 nd->state &= ~ND_JUMPED; // no d_weak_revalidate(), please... in path_lookupat()
2357 err = complete_walk(nd); in path_lookupat()
2359 if (!err && nd->flags & LOOKUP_DIRECTORY) in path_lookupat()
2360 if (!d_can_lookup(nd->path.dentry)) in path_lookupat()
2363 *path = nd->path; in path_lookupat()
2364 nd->path.mnt = NULL; in path_lookupat()
2365 nd->path.dentry = NULL; in path_lookupat()
2367 terminate_walk(nd); in path_lookupat()
2375 struct nameidata nd; in filename_lookup() local
2378 set_nameidata(&nd, dfd, name); in filename_lookup()
2380 nd.root = *root; in filename_lookup()
2381 nd.state = ND_ROOT_PRESET; in filename_lookup()
2383 retval = path_lookupat(&nd, flags | LOOKUP_RCU, path); in filename_lookup()
2385 retval = path_lookupat(&nd, flags, path); in filename_lookup()
2387 retval = path_lookupat(&nd, flags | LOOKUP_REVAL, path); in filename_lookup()
2397 /* Returns 0 and nd will be valid on success; Retuns error, otherwise. */
2398 static int path_parentat(struct nameidata *nd, unsigned flags, in path_parentat() argument
2401 const char *s = path_init(nd, flags); in path_parentat()
2402 int err = link_path_walk(s, nd); in path_parentat()
2404 err = complete_walk(nd); in path_parentat()
2406 *parent = nd->path; in path_parentat()
2407 nd->path.mnt = NULL; in path_parentat()
2408 nd->path.dentry = NULL; in path_parentat()
2410 terminate_walk(nd); in path_parentat()
2419 struct nameidata nd; in filename_parentat() local
2423 set_nameidata(&nd, dfd, name); in filename_parentat()
2424 retval = path_parentat(&nd, flags | LOOKUP_RCU, parent); in filename_parentat()
2426 retval = path_parentat(&nd, flags, parent); in filename_parentat()
2428 retval = path_parentat(&nd, flags | LOOKUP_REVAL, parent); in filename_parentat()
2430 *last = nd.last; in filename_parentat()
2431 *type = nd.last_type; in filename_parentat()
2504 if (len < 2 || (len == 2 && name[1] == '.')) in lookup_one_len_common()
2684 * 2. We should have write and exec permissions on dir
2744 * 2. We can't do it if dir is read-only (done in permission())
3024 static struct dentry *atomic_open(struct nameidata *nd, struct dentry *dentry, in atomic_open() argument
3029 struct inode *dir = nd->path.dentry->d_inode; in atomic_open()
3032 if (nd->flags & LOOKUP_DIRECTORY) in atomic_open()
3036 file->f_path.mnt = nd->path.mnt; in atomic_open()
3079 static struct dentry *lookup_open(struct nameidata *nd, struct file *file, in lookup_open() argument
3083 struct dentry *dir = nd->path.dentry; in lookup_open()
3095 dentry = d_lookup(dir, &nd->last); in lookup_open()
3098 dentry = d_alloc_parallel(dir, &nd->last, &wq); in lookup_open()
3105 error = d_revalidate(dentry, nd->flags); in lookup_open()
3135 create_error = may_o_create(&nd->path, dentry, mode); in lookup_open()
3142 dentry = atomic_open(nd, dentry, file, open_flag, mode); in lookup_open()
3150 nd->flags); in lookup_open()
3186 static const char *open_last_lookups(struct nameidata *nd, in open_last_lookups() argument
3189 struct dentry *dir = nd->path.dentry; in open_last_lookups()
3197 nd->flags |= op->intent; in open_last_lookups()
3199 if (nd->last_type != LAST_NORM) { in open_last_lookups()
3200 if (nd->depth) in open_last_lookups()
3201 put_link(nd); in open_last_lookups()
3202 return handle_dots(nd, nd->last_type); in open_last_lookups()
3206 if (nd->last.name[nd->last.len]) in open_last_lookups()
3207 nd->flags |= LOOKUP_FOLLOW | LOOKUP_DIRECTORY; in open_last_lookups()
3209 dentry = lookup_fast(nd, &inode, &seq); in open_last_lookups()
3215 BUG_ON(nd->flags & LOOKUP_RCU); in open_last_lookups()
3218 if (nd->flags & LOOKUP_RCU) { in open_last_lookups()
3219 if (!try_to_unlazy(nd)) in open_last_lookups()
3222 audit_inode(nd->name, dir, AUDIT_INODE_PARENT); in open_last_lookups()
3224 if (unlikely(nd->last.name[nd->last.len])) in open_last_lookups()
3229 got_write = !mnt_want_write(nd->path.mnt); in open_last_lookups()
3240 dentry = lookup_open(nd, file, op, got_write); in open_last_lookups()
3249 mnt_drop_write(nd->path.mnt); in open_last_lookups()
3255 dput(nd->path.dentry); in open_last_lookups()
3256 nd->path.dentry = dentry; in open_last_lookups()
3261 if (nd->depth) in open_last_lookups()
3262 put_link(nd); in open_last_lookups()
3263 res = step_into(nd, WALK_TRAILING, dentry, inode, seq); in open_last_lookups()
3265 nd->flags &= ~(LOOKUP_OPEN|LOOKUP_CREATE|LOOKUP_EXCL); in open_last_lookups()
3272 static int do_open(struct nameidata *nd, in do_open() argument
3281 error = complete_walk(nd); in do_open()
3286 audit_inode(nd->name, nd->path.dentry, 0); in do_open()
3290 if (d_is_dir(nd->path.dentry)) in do_open()
3292 error = may_create_in_sticky(nd->dir_mode, nd->dir_uid, in do_open()
3293 d_backing_inode(nd->path.dentry)); in do_open()
3297 if ((nd->flags & LOOKUP_DIRECTORY) && !d_can_lookup(nd->path.dentry)) in do_open()
3306 } else if (d_is_reg(nd->path.dentry) && open_flag & O_TRUNC) { in do_open()
3307 error = mnt_want_write(nd->path.mnt); in do_open()
3312 error = may_open(&nd->path, acc_mode, open_flag); in do_open()
3314 error = vfs_open(&nd->path, file); in do_open()
3324 mnt_drop_write(nd->path.mnt); in do_open()
3368 static int do_tmpfile(struct nameidata *nd, unsigned flags, in do_tmpfile() argument
3374 int error = path_lookupat(nd, flags | LOOKUP_DIRECTORY, &path); in do_tmpfile()
3386 audit_inode(nd->name, child, 0); in do_tmpfile()
3400 static int do_o_path(struct nameidata *nd, unsigned flags, struct file *file) in do_o_path() argument
3403 int error = path_lookupat(nd, flags, &path); in do_o_path()
3405 audit_inode(nd->name, path.dentry, 0); in do_o_path()
3412 static struct file *path_openat(struct nameidata *nd, in path_openat() argument
3423 error = do_tmpfile(nd, flags, op, file); in path_openat()
3425 error = do_o_path(nd, flags, file); in path_openat()
3427 const char *s = path_init(nd, flags); in path_openat()
3428 while (!(error = link_path_walk(s, nd)) && in path_openat()
3429 (s = open_last_lookups(nd, file, op)) != NULL) in path_openat()
3432 error = do_open(nd, file, op); in path_openat()
3433 terminate_walk(nd); in path_openat()
3454 struct nameidata nd; in do_filp_open() local
3458 set_nameidata(&nd, dfd, pathname); in do_filp_open()
3459 filp = path_openat(&nd, op, flags | LOOKUP_RCU); in do_filp_open()
3461 filp = path_openat(&nd, op, flags); in do_filp_open()
3463 filp = path_openat(&nd, op, flags | LOOKUP_REVAL); in do_filp_open()
3471 struct nameidata nd; in do_file_open_root() local
3483 set_nameidata(&nd, -1, filename); in do_file_open_root()
3484 nd.root = *root; in do_file_open_root()
3485 nd.state = ND_ROOT_PRESET; in do_file_open_root()
3486 file = path_openat(&nd, op, flags | LOOKUP_RCU); in do_file_open_root()
3488 file = path_openat(&nd, op, flags); in do_file_open_root()
3490 file = path_openat(&nd, op, flags | LOOKUP_REVAL); in do_file_open_root()
4279 * we'd better make sure that there's no link(2) for them.