diff --git a/libc/kernel/uapi/linux/bcache.h b/libc/kernel/uapi/linux/bcache.h
new file mode 100644
index 0000000..4d1d454
--- /dev/null
+++ b/libc/kernel/uapi/linux/bcache.h
@@ -0,0 +1,209 @@
+/****************************************************************************
+ ****************************************************************************
+ ***
+ ***   This header was automatically generated from a Linux kernel header
+ ***   of the same name, to make information necessary for userspace to
+ ***   call into the kernel available to libc.  It contains only constants,
+ ***   structures, and macros generated from the original header, and thus,
+ ***   contains no copyrightable information.
+ ***
+ ***   To edit the content of this header, modify the corresponding
+ ***   source file (e.g. under external/kernel-headers/original/) then
+ ***   run bionic/libc/kernel/tools/update_all.py
+ ***
+ ***   Any manual change here will be lost the next time this script will
+ ***   be run. You've been warned!
+ ***
+ ****************************************************************************
+ ****************************************************************************/
+#ifndef _LINUX_BCACHE_H
+#define _LINUX_BCACHE_H
+#include <asm/types.h>
+#define BITMASK(name, type, field, offset, size)  static inline __u64 name(const type *k)  { return (k->field >> offset) & ~(~0ULL << size); }    static inline void SET_##name(type *k, __u64 v)  {   k->field &= ~(~(~0ULL << size) << offset);   k->field |= (v & ~(~0ULL << size)) << offset;  }
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+struct bkey {
+ __u64 high;
+ __u64 low;
+ __u64 ptr[];
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+};
+#define KEY_FIELD(name, field, offset, size)   BITMASK(name, struct bkey, field, offset, size)
+#define PTR_FIELD(name, offset, size)  static inline __u64 name(const struct bkey *k, unsigned i)  { return (k->ptr[i] >> offset) & ~(~0ULL << size); }    static inline void SET_##name(struct bkey *k, unsigned i, __u64 v)  {   k->ptr[i] &= ~(~(~0ULL << size) << offset);   k->ptr[i] |= (v & ~(~0ULL << size)) << offset;  }
+#define KEY_SIZE_BITS 16
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define KEY_MAX_U64S 8
+#define KEY(inode, offset, size)  ((struct bkey) {   .high = (1ULL << 63) | ((__u64) (size) << 20) | (inode),   .low = (offset)  })
+#define ZERO_KEY KEY(0, 0, 0)
+#define MAX_KEY_INODE (~(~0 << 20))
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define MAX_KEY_OFFSET (~0ULL >> 1)
+#define MAX_KEY KEY(MAX_KEY_INODE, MAX_KEY_OFFSET, 0)
+#define KEY_START(k) (KEY_OFFSET(k) - KEY_SIZE(k))
+#define START_KEY(k) KEY(KEY_INODE(k), KEY_START(k), 0)
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define PTR_DEV_BITS 12
+#define PTR_CHECK_DEV ((1 << PTR_DEV_BITS) - 1)
+#define PTR(gen, offset, dev)   ((((__u64) dev) << 51) | ((__u64) offset) << 8 | gen)
+#define bkey_copy(_dest, _src) memcpy(_dest, _src, bkey_bytes(_src))
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define BKEY_PAD 8
+#define BKEY_PADDED(key)   union { struct bkey key; __u64 key ## _pad[BKEY_PAD]; }
+#define BCACHE_SB_VERSION_CDEV 0
+#define BCACHE_SB_VERSION_BDEV 1
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define BCACHE_SB_VERSION_CDEV_WITH_UUID 3
+#define BCACHE_SB_VERSION_BDEV_WITH_OFFSET 4
+#define BCACHE_SB_MAX_VERSION 4
+#define SB_SECTOR 8
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define SB_SIZE 4096
+#define SB_LABEL_SIZE 32
+#define SB_JOURNAL_BUCKETS 256U
+#define MAX_CACHES_PER_SET 8
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define BDEV_DATA_START_DEFAULT 16
+struct cache_sb {
+ __u64 csum;
+ __u64 offset;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ __u64 version;
+ __u8 magic[16];
+ __u8 uuid[16];
+ union {
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ __u8 set_uuid[16];
+ __u64 set_magic;
+ };
+ __u8 label[SB_LABEL_SIZE];
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ __u64 flags;
+ __u64 seq;
+ __u64 pad[8];
+ union {
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ struct {
+ __u64 nbuckets;
+ __u16 block_size;
+ __u16 bucket_size;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ __u16 nr_in_set;
+ __u16 nr_this_dev;
+ };
+ struct {
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ __u64 data_offset;
+ };
+ };
+ __u32 last_mount;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ __u16 first_bucket;
+ union {
+ __u16 njournal_buckets;
+ __u16 keys;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ };
+ __u64 d[SB_JOURNAL_BUCKETS];
+};
+#define CACHE_REPLACEMENT_LRU 0U
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define CACHE_REPLACEMENT_FIFO 1U
+#define CACHE_REPLACEMENT_RANDOM 2U
+#define CACHE_MODE_WRITETHROUGH 0U
+#define CACHE_MODE_WRITEBACK 1U
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define CACHE_MODE_WRITEAROUND 2U
+#define CACHE_MODE_NONE 3U
+#define BDEV_STATE_NONE 0U
+#define BDEV_STATE_CLEAN 1U
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define BDEV_STATE_DIRTY 2U
+#define BDEV_STATE_STALE 3U
+#define JSET_MAGIC 0x245235c1a3625032ULL
+#define PSET_MAGIC 0x6750e15f87337f91ULL
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define BSET_MAGIC 0x90135c78b99e07f5ULL
+#define BCACHE_JSET_VERSION_UUIDv1 1
+#define BCACHE_JSET_VERSION_UUID 1
+#define BCACHE_JSET_VERSION 1
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+struct jset {
+ __u64 csum;
+ __u64 magic;
+ __u64 seq;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ __u32 version;
+ __u32 keys;
+ __u64 last_seq;
+ BKEY_PADDED(uuid_bucket);
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ BKEY_PADDED(btree_root);
+ __u16 btree_level;
+ __u16 pad[3];
+ __u64 prio_bucket[MAX_CACHES_PER_SET];
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ union {
+ struct bkey start[0];
+ __u64 d[0];
+ };
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+};
+struct prio_set {
+ __u64 csum;
+ __u64 magic;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ __u64 seq;
+ __u32 version;
+ __u32 pad;
+ __u64 next_bucket;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ struct bucket_disk {
+ __u16 prio;
+ __u8 gen;
+ } __attribute((packed)) data[];
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+};
+struct uuid_entry {
+ union {
+ struct {
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ __u8 uuid[16];
+ __u8 label[32];
+ __u32 first_reg;
+ __u32 last_reg;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ __u32 invalidated;
+ __u32 flags;
+ __u64 sectors;
+ };
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ __u8 pad[128];
+ };
+};
+#define BCACHE_BSET_CSUM 1
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define BCACHE_BSET_VERSION 1
+struct bset {
+ __u64 csum;
+ __u64 magic;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ __u64 seq;
+ __u32 version;
+ __u32 keys;
+ union {
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ struct bkey start[0];
+ __u64 d[0];
+ };
+};
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+struct uuid_entry_v0 {
+ __u8 uuid[16];
+ __u8 label[32];
+ __u32 first_reg;
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+ __u32 last_reg;
+ __u32 invalidated;
+ __u32 pad;
+};
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#endif