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authorH. Peter Anvin <hpa@zytor.com>2009-08-14 17:14:01 -0700
committerH. Peter Anvin <hpa@zytor.com>2009-08-14 17:18:48 -0700
commit6f3e28c639cebea5969939ff1f5407899fa1f113 (patch)
tree8b8486038148eab6b9c1ac0b8a9482c56e8d0b57
parent8abec8d70f99c890beb281ec3f2669990345bcf1 (diff)
downloadlwip-btrfs.tar.gz
lwip-btrfs.tar.xz
lwip-btrfs.zip
btrfs: beginning of btrfs supportbtrfs
Infrastructure for btrfs, plus an import of the btrfs code written for Grub 0.97. It does not yet compile and will need significant changes still. Signed-off-by: H. Peter Anvin <hpa@zytor.com>
-rw-r--r--core/Makefile2
-rw-r--r--core/adv.inc4
-rw-r--r--core/bootsect.inc2
-rw-r--r--core/btrlinux.asm30
-rw-r--r--core/comboot.inc6
-rw-r--r--core/fs/btrfs/btrfs.c1427
-rw-r--r--core/fs/btrfs/btrfs.h1416
-rw-r--r--core/kernel.inc1
-rw-r--r--core/macros.inc19
9 files changed, 2900 insertions, 7 deletions
diff --git a/core/Makefile b/core/Makefile
index d35390f4..a42712a9 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -32,7 +32,7 @@ INCLUDES = -I./include -I$(com32)/include
CODEPAGE = cp865
# The targets to build in this directory...
-BTARGET = kwdhash.gen \
+BTARGET = kwdhash.gen btrlinux.bin \
extlinux.bin extlinux.bss extlinux.sys \
ldlinux.bss ldlinux.sys ldlinux.bin \
isolinux.bin isolinux-debug.bin pxelinux.0
diff --git a/core/adv.inc b/core/adv.inc
index 2dc16339..e141eab9 100644
--- a/core/adv.inc
+++ b/core/adv.inc
@@ -67,7 +67,7 @@ adv_init:
cmp byte [ADVDrive],-1
jne adv_read
-%if IS_SYSLINUX || IS_EXTLINUX
+%if IS_HD_BASED
cmp word [ADVSectors],2 ; Not present?
jb adv_verify
@@ -430,7 +430,7 @@ adv_read_write:
.noparm:
; No CHS info... this better be our boot drive, then
-%if IS_SYSLINUX || IS_EXTLINUX
+%if IS_HD_BASED
cmp dl,[DriveNumber]
jne .cb_overflow ; Fatal error!
movzx esi,word [bsSecPerTrack]
diff --git a/core/bootsect.inc b/core/bootsect.inc
index 4d70998c..55391e24 100644
--- a/core/bootsect.inc
+++ b/core/bootsect.inc
@@ -61,7 +61,7 @@ load_bootsec:
xor edx,edx
xor esi,esi
-%if IS_SYSLINUX || IS_EXTLINUX
+%if IS_HD_BASED
; Restore original FDC table
mov eax,[OrigFDCTabPtr]
mov [fdctab],eax
diff --git a/core/btrlinux.asm b/core/btrlinux.asm
new file mode 100644
index 00000000..b1363e92
--- /dev/null
+++ b/core/btrlinux.asm
@@ -0,0 +1,30 @@
+; -*- fundamental -*- (asm-mode sucks)
+; ****************************************************************************
+;
+; btrlinux.asm
+;
+; A program to boot Linux kernels off an btrfs filesystem.
+;
+; Copyright 1994-2009 H. Peter Anvin - All Rights Reserved
+; Copyright 2009 Intel Corporation; author: H. Peter Anvin
+;
+; This program is free software; you can redistribute it and/or modify
+; it under the terms of the GNU General Public License as published by
+; the Free Software Foundation, Inc., 53 Temple Place Ste 330,
+; Boston MA 02111-1307, USA; either version 2 of the License, or
+; (at your option) any later version; incorporated herein by reference.
+;
+; ****************************************************************************
+
+%define IS_BTRLINUX 1
+%include "head.inc"
+
+;
+; Some semi-configurable constants... change on your own risk.
+;
+my_id equ btrlinux_id
+
+ extern btrfs_fs_ops
+ROOT_FS_OPS equ btrfs_fs_ops
+
+%include "diskfs.inc"
diff --git a/core/comboot.inc b/core/comboot.inc
index fb0f57f7..c99068df 100644
--- a/core/comboot.inc
+++ b/core/comboot.inc
@@ -591,7 +591,7 @@ comapi_derinfo:
mov P_DL,al
mov P_FS,cs
mov P_SI,OrigESDI
-%if IS_SYSLINUX || IS_EXTLINUX
+%if IS_HD_BASED
mov P_ES,cs
mov P_BX,PartInfo
%elif IS_ISOLINUX
@@ -637,7 +637,7 @@ comapi_cleanup:
sub bp,sp ; unload_pxe may move the stack around
call unload_pxe
add bp,sp ; restore frame pointer...
-%elif IS_SYSLINUX || IS_EXTLINUX
+%elif IS_HD_BASED
; Restore original FDC table
mov eax,[OrigFDCTabPtr]
mov [fdctab],eax
@@ -831,7 +831,7 @@ comapi_userfont:
;
; INT 22h AX=0019h Read disk
;
-%if IS_SYSLINUX || IS_ISOLINUX || IS_EXTLINUX
+%if IS_DISK_BASED
comapi_readdisk:
mov esi,P_ESI ; Enforce ESI == EDI == 0, these
or esi,P_EDI ; are reserved for future expansion
diff --git a/core/fs/btrfs/btrfs.c b/core/fs/btrfs/btrfs.c
new file mode 100644
index 00000000..f9afa71c
--- /dev/null
+++ b/core/fs/btrfs/btrfs.c
@@ -0,0 +1,1427 @@
+/* fsys_btrfs.c - an implementation for the Btrfs filesystem
+ *
+ * Copyright 2009 Red Hat, Inc. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <string.h>
+#include "btrfs.h"
+#include "fs.h"
+
+/*** HACKS ***/
+int errnum;
+enum errors {
+ ERR_NONE,
+ ERR_FSYS_MOUNT,
+ ERR_OUTSIDE_PART,
+ ERR_FSYS_CORRUPT,
+ ERR_BAD_FILETYPE,
+ ERR_SYMLINK_LOOP,
+ ERR_FILE_NOT_FOUND,
+ ERR_FILELENGTH,
+};
+/*** END HACKS ***/
+
+#define BTRFS_VERBOSE 0
+
+/* Cache layouts */
+
+#define LOOKUP_CACHE_BUF_SIZE (4096)
+#define LOOKUP_CACHE_SIZE (LOOKUP_CACHE_BUF_SIZE * LAST_LOOKUP_POOL)
+
+static char btrfs_lookup_cache[LAST_LOOKUP_POOL][LOOKUP_CACHE_BUF_SIZE];
+static struct btrfs_fs_info btrfs_fs_info;
+
+#define BTRFS_CACHE_SIZE (sizeof(struct btrfs_fs_info) + \
+ LOOKUP_CACHE_SIZE)
+#define BTRFS_FILE_INFO (&btrfs_fs_info.file_info)
+#define BTRFS_TREE_ROOT (&btrfs_fs_info.tree_root)
+#define BTRFS_CHUNK_ROOT (&btrfs_fs_info.chunk_root)
+#define BTRFS_FS_ROOT (&btrfs_fs_info.fs_root)
+#define BTRFS_SUPER (&btrfs_fs_info.super_copy)
+#define LOOKUP_CACHE_BUF(id) btrfs_lookup_cache[id]
+
+#define noop do {; } while (0)
+
+#if BTRFS_VERBOSE
+#define btrfs_msg(format, ...) printf(format , ## __VA_ARGS__)
+#else
+#define btrfs_msg(format, args...) noop
+#endif
+
+static inline u64 btrfs_sb_offset(int mirror)
+{
+ u64 start = 16 * 1024;
+ if (mirror)
+ return start << (BTRFS_SUPER_MIRROR_SHIFT * mirror);
+ return BTRFS_SUPER_INFO_OFFSET;
+}
+
+static inline char *grab_lookup_cache(lookup_pool_id lpid)
+{
+ char *buf = LOOKUP_CACHE_BUF(lpid);
+ memset(buf, 0, LOOKUP_CACHE_BUF_SIZE);
+ return buf;
+}
+
+static inline struct btrfs_path *btrfs_grab_path(lookup_pool_id lpid)
+{
+ return &btrfs_fs_info.paths[lpid];
+}
+
+static inline void btrfs_update_file_info(struct btrfs_path *path)
+{
+ btrfs_item_key_to_cpu(&path->nodes[0],
+ BTRFS_FILE_INFO,
+ path->slots[0]);
+}
+
+static inline void btrfs_set_root_dir_key(struct btrfs_key *key)
+{
+ key->objectid = BTRFS_FIRST_FREE_OBJECTID;
+ btrfs_set_key_type(key, BTRFS_INODE_ITEM_KEY);
+ key->offset = 0;
+}
+
+static inline void copy_extent_buffer(struct extent_buffer *dst,
+ struct extent_buffer *src)
+{
+ char *data = dst->data;
+ memcpy(dst, src, sizeof(*dst));
+ memcpy(data, src->data, 4096);
+ dst->data = data;
+}
+
+static inline void move_extent_buffer(struct extent_buffer *dst,
+ struct extent_buffer *src)
+{
+ memcpy(dst, src, sizeof(*dst));
+}
+
+static inline void init_btrfs_root (struct btrfs_root *root)
+{
+ root->node.data = root->data;
+}
+
+static inline void init_btrfs_path(lookup_pool_id lpid)
+{
+ struct btrfs_path *path;
+ path = btrfs_grab_path(lpid);
+ path->lpid = lpid;
+}
+
+static inline void init_btrfs_info(void)
+{
+ int i;
+ struct btrfs_fs_info *fs = &btrfs_fs_info;
+
+ memset(fs, 0, sizeof (*fs));
+ for(i = 0; i < LAST_LOOKUP_POOL; i++)
+ init_btrfs_path(i);
+ init_btrfs_root(&fs->tree_root);
+ init_btrfs_root(&fs->chunk_root);
+ init_btrfs_root(&fs->fs_root);
+}
+
+static void setup_root(struct btrfs_root *root,
+ u32 nodesize,
+ u32 leafsize,
+ u32 sectorsize,
+ u32 stripesize,
+ u64 objectid)
+{
+ root->fs_info = &btrfs_fs_info;
+ root->nodesize = nodesize;
+ root->leafsize = leafsize;
+ root->sectorsize = sectorsize;
+ root->stripesize = stripesize;
+ root->objectid = objectid;
+}
+
+/*
+ * Pick up the latest root of a
+ * tree with specified @objectid
+ */
+static int btrfs_find_last_root(struct btrfs_root *tree_root,
+ u64 objectid,
+ struct btrfs_root_item *item,
+ struct btrfs_key *key,
+ lookup_pool_id lpid)
+{
+ int ret;
+ int slot;
+ struct btrfs_key search_key;
+ struct btrfs_key found_key;
+ struct btrfs_path *path;
+
+ search_key.objectid = objectid;
+ search_key.type = BTRFS_ROOT_ITEM_KEY;
+ search_key.offset = (u64)-1;
+ path = btrfs_grab_path(lpid);
+
+ ret = aux_tree_lookup(tree_root, &search_key, path);
+ if (ret < 0)
+ return 1;
+ slot = path->slots[0];
+ WARN_ON(slot == 0);
+ slot -= 1;
+ btrfs_item_key_to_cpu(&path->nodes[0], &found_key, slot);
+ if (found_key.objectid != objectid)
+ return 1;
+ read_extent_buffer(&path->nodes[0], item,
+ btrfs_item_ptr_offset(&path->nodes[0], slot),
+ sizeof(*item));
+ memcpy(key, &found_key, sizeof(found_key));
+ return 0;
+}
+
+static int find_setup_root(struct btrfs_root *tree_root,
+ u32 nodesize,
+ u32 leafsize,
+ u32 sectorsize,
+ u32 stripesize,
+ u64 objectid,
+ struct btrfs_root *dest_root,
+ u64 bytenr,
+ u32 blocksize,
+ u64 generation,
+ lookup_pool_id lpid)
+{
+ int ret;
+ struct extent_buffer eb;
+
+ setup_root(dest_root,
+ nodesize,
+ leafsize,
+ sectorsize,
+ stripesize,
+ objectid);
+ if (tree_root) {
+ /*
+ * pick up the latest version
+ * of the root we want to set up
+ */
+ ret = btrfs_find_last_root(tree_root, objectid,
+ &dest_root->root_item,
+ &dest_root->root_key,
+ lpid);
+ if (ret)
+ return ret;
+ bytenr = btrfs_root_bytenr(&dest_root->root_item);
+ blocksize = btrfs_level_size(dest_root,
+ btrfs_root_level(&dest_root->root_item));
+ generation = btrfs_root_generation(&tree_root->root_item);
+ }
+ ret = read_tree_block(dest_root,
+ &eb,
+ bytenr,
+ blocksize,
+ generation,
+ lpid);
+ if (!ret)
+ return 1;
+ copy_extent_buffer(&dest_root->node, &eb);
+ return 0;
+}
+
+static inline int btrfs_strncmp(const char *cs, const char *ct, int count)
+{
+ signed char __res = 0;
+
+ while (count) {
+ if ((__res = *cs - *ct++) != 0 || !*cs++)
+ break;
+ count--;
+ }
+ return __res;
+}
+
+static int btrfs_check_super_block(struct btrfs_super_block *sb)
+{
+ if (sb->num_devices != BTRFS_DEFAULT_NUM_DEVICES) {
+ btrfs_msg("Btrfs multi-device configuration unsupported\n");
+ goto error;
+ }
+ if (sb->nodesize != BTRFS_DEFAULT_NODE_SIZE) {
+ btrfs_msg("Btrfs node size (%d) != %d unsupported\n",
+ sb->nodesize, BTRFS_DEFAULT_NODE_SIZE);
+ goto error;
+ }
+ if (sb->leafsize != BTRFS_DEFAULT_LEAF_SIZE) {
+ btrfs_msg("Btrfs leaf size (%d) != %d unsupported\n",
+ sb->leafsize, BTRFS_DEFAULT_LEAF_SIZE);
+ goto error;
+ }
+ return 1;
+ error:
+ errnum = ERR_FSYS_MOUNT;
+ return 0;
+}
+
+int btrfs_init(struct fs_info *fs_info)
+{
+ int i;
+ int ret;
+ u64 transid = 0;
+ u64 bytenr;
+
+ struct btrfs_fs_info *fs = &btrfs_fs_info;
+ struct btrfs_super_block *sb_tmp; /* current */
+ struct btrfs_super_block *sb; /* latest */
+
+ struct btrfs_root *tree_root = &fs->tree_root;
+ struct btrfs_root *chunk_root = &fs->chunk_root;
+ struct btrfs_root *fs_root = &fs->fs_root;
+
+ init_btrfs_info();
+
+ sb_tmp = &fs->super_temp;
+ sb = &fs->super_copy;
+
+ /* pick up the latest version of superblock */
+ for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
+ bytenr = btrfs_sb_offset(i);
+ ret = devread(bytenr >> SECTOR_SHIFT,
+ 0,
+ sizeof(*sb_tmp),
+ (char *)sb_tmp);
+ if (!ret)
+ continue;
+
+ if (btrfs_super_bytenr(sb_tmp) != bytenr ||
+ btrfs_strncmp((char *)(&sb_tmp->magic),
+ BTRFS_MAGIC,
+ sizeof(sb_tmp->magic)))
+ continue;
+ if (btrfs_super_generation(sb_tmp) > transid) {
+ memcpy(sb, sb_tmp, sizeof(*sb_tmp));
+ transid = btrfs_super_generation(sb);
+ }
+ }
+ /* there might be errors when reading super mirrors */
+ if (errnum == ERR_OUTSIDE_PART)
+ errnum = ERR_NONE;
+ if (transid <= 0) {
+ btrfs_msg("No valid Btrfs superblock found\n");
+ return 0;
+ }
+ if (!btrfs_check_super_block(sb))
+ return 0;
+ /* setup chunk root */
+ ret = find_setup_root(NULL,
+ btrfs_super_nodesize(sb),
+ btrfs_super_leafsize(sb),
+ btrfs_super_sectorsize(sb),
+ btrfs_super_stripesize(sb),
+ BTRFS_CHUNK_TREE_OBJECTID,
+ chunk_root,
+ btrfs_super_chunk_root(sb),
+ btrfs_chunk_root_level_size(sb),
+ btrfs_super_chunk_root_generation(sb),
+ FIRST_EXTERNAL_LOOKUP_POOL);
+ if (ret)
+ return 0;
+ /* setup tree root */
+ ret = find_setup_root(NULL,
+ btrfs_super_nodesize(sb),
+ btrfs_super_leafsize(sb),
+ btrfs_super_sectorsize(sb),
+ btrfs_super_stripesize(sb),
+ BTRFS_ROOT_TREE_OBJECTID,
+ tree_root,
+ btrfs_super_root(sb),
+ btrfs_root_level_size(sb),
+ btrfs_super_generation(sb),
+ FIRST_EXTERNAL_LOOKUP_POOL);
+ if (ret)
+ return 0;
+ /* setup fs_root */
+ ret = find_setup_root(tree_root,
+ btrfs_super_nodesize(sb),
+ btrfs_super_leafsize(sb),
+ btrfs_super_sectorsize(sb),
+ btrfs_super_stripesize(sb),
+ BTRFS_FS_TREE_OBJECTID,
+ fs_root,
+ 0,
+ 0,
+ 0,
+ FIRST_EXTERNAL_LOOKUP_POOL);
+ return !ret;
+}
+
+/*
+ * Check, whether @chunk is the map for a
+ * block with @logical block number.
+ * If yes, then fill the @map.
+ * Return 1 on affirmative result,
+ * otherwise return 0.
+ */
+int check_read_chunk(struct btrfs_key *key,
+ struct extent_buffer *leaf,
+ struct btrfs_chunk *chunk,
+ struct map_lookup *map,
+ u64 logical)
+{
+ int i;
+ u64 chunk_start;
+ u64 chunk_size;
+ int num_stripes;
+
+ chunk_start = key->offset;
+ chunk_size = btrfs_chunk_length(leaf, chunk);
+
+ if (logical + 1 > chunk_start + chunk_size ||
+ logical < chunk_start)
+ /* not a fit */
+ return 0;
+ num_stripes = btrfs_chunk_num_stripes(leaf, chunk);
+ map->ce.start = chunk_start;
+ map->ce.size = chunk_size;
+ map->num_stripes = num_stripes;
+ map->io_width = btrfs_chunk_io_width(leaf, chunk);
+ map->io_align = btrfs_chunk_io_align(leaf, chunk);
+ map->sector_size = btrfs_chunk_sector_size(leaf, chunk);
+ map->stripe_len = btrfs_chunk_stripe_len(leaf, chunk);
+ map->type = btrfs_chunk_type(leaf, chunk);
+ map->sub_stripes = btrfs_chunk_sub_stripes(leaf, chunk);
+
+ for (i = 0; i < num_stripes; i++) {
+ map->stripes[i].physical =
+ btrfs_stripe_offset_nr(leaf, chunk, i);
+ }
+ return 1;
+}
+
+static void init_extent_buffer(struct extent_buffer *eb,
+ u64 logical,
+ u32 blocksize,
+ u64 physical,
+ lookup_pool_id lpid)
+{
+ eb->start = logical;
+ eb->len = blocksize;
+ eb->refs = 2;
+ eb->flags = 0;
+ eb->dev_bytenr = physical;
+ eb->data = grab_lookup_cache(lpid);
+}
+
+/*
+ * Search for a map by logical offset in sys array.
+ * Return -1 on errors;
+ * Return 1 if the map is found,
+ * Return 0 if the map is not found.
+ */
+int sys_array_lookup(struct map_lookup *map, u64 logical)
+{
+ struct extent_buffer sb;
+ struct btrfs_disk_key *disk_key;
+ struct btrfs_chunk *chunk;
+ struct btrfs_key key;
+ u32 num_stripes;
+ u32 array_size;
+ u32 len = 0;
+ u8 *ptr;
+ unsigned long sb_ptr;
+ u32 cur;
+ int ret;
+ int i = 0;
+
+ sb.data = (char *)BTRFS_SUPER;
+ array_size = btrfs_super_sys_array_size(BTRFS_SUPER);
+
+ ptr = BTRFS_SUPER->sys_chunk_array;
+ sb_ptr = offsetof(struct btrfs_super_block, sys_chunk_array);
+ cur = 0;
+
+ while (cur < array_size) {
+ disk_key = (struct btrfs_disk_key *)ptr;
+ btrfs_disk_key_to_cpu(&key, disk_key);
+
+ len = sizeof(*disk_key);
+ ptr += len;
+ sb_ptr += len;
+ cur += len;
+
+ if (key.type == BTRFS_CHUNK_ITEM_KEY) {
+ chunk = (struct btrfs_chunk *)sb_ptr;
+ ret = check_read_chunk(&key, &sb,
+ chunk, map, logical);
+ if (ret)
+ /* map is found */
+ return ret;
+ num_stripes = btrfs_chunk_num_stripes(&sb, chunk);
+ len = btrfs_chunk_item_size(num_stripes);
+ } else {
+ errnum = ERR_FSYS_CORRUPT;
+ return -1;
+ }
+ ptr += len;
+ sb_ptr += len;
+ cur += len;
+ i++;
+ }
+ return 0;
+}
+
+/*
+ * Search for a map by logical offset in the chunk tree.
+ * Return 1 if map is found, otherwise return 0.
+ */
+static int chunk_tree_lookup(struct map_lookup *map,
+ u64 logical)
+{
+ int ret;
+ int slot;
+ struct extent_buffer *leaf;
+ struct btrfs_key key;
+ struct btrfs_key found_key;
+ struct btrfs_chunk *chunk;
+ struct btrfs_path *path;
+
+ path = btrfs_grab_path(INTERNAL_LOOKUP_POOL);
+
+ key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
+ key.offset = logical;
+ key.type = BTRFS_CHUNK_ITEM_KEY;
+
+ ret = aux_tree_lookup(BTRFS_CHUNK_ROOT, &key, path);
+ if (ret < 0)
+ return 0;
+ leaf = &path->nodes[0];
+ slot = path->slots[0];
+ if (ret == 1) {
+ WARN_ON(slot == 0);
+ slot -= 1;
+ }
+ btrfs_item_key_to_cpu(leaf, &found_key, slot);
+ if (found_key.type != BTRFS_CHUNK_ITEM_KEY)
+ return 0;
+ chunk = btrfs_item_ptr(leaf, slot, struct btrfs_chunk);
+ return check_read_chunk(&found_key, leaf,
+ chunk, map, logical);
+}
+
+/*
+ * Btrfs logical/physical block mapper.
+ * Look for an appropriate map-extent and
+ * perform a translation. Return 1 on errors.
+ */
+int __btrfs_map_block(u64 logical, u64 *length, struct btrfs_multi_bio *multi,
+ int mirror_num)
+{
+ struct map_lookup map;
+ u64 offset;
+ u64 stripe_offset;
+ u64 stripe_nr;
+ struct cache_extent *ce;
+ int stripe_index;
+ int i;
+ int ret;
+
+ memset(&map, 0, sizeof(map));
+ ret = sys_array_lookup(&map, logical);
+ if (ret == -1) {
+ errnum = ERR_FSYS_CORRUPT;
+ return 1;
+ }
+ if (ret == 0) {
+ ret = chunk_tree_lookup(&map, logical);
+ if (!ret) {
+ /* something should be found! */
+ errnum = ERR_FSYS_CORRUPT;
+ return 1;
+ }
+ }
+ /* do translation */
+ ce = &map.ce;
+
+ offset = logical - ce->start;
+ stripe_nr = offset / map.stripe_len;
+ stripe_offset = stripe_nr * map.stripe_len;
+ WARN_ON(offset < stripe_offset);
+
+ stripe_offset = offset - stripe_offset;
+
+ if (map.type & (BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1 |
+ BTRFS_BLOCK_GROUP_RAID10 |
+ BTRFS_BLOCK_GROUP_DUP)) {
+ *length = min_t(u64, ce->size - offset,
+ map.stripe_len - stripe_offset);
+ } else {
+ *length = ce->size - offset;
+ }
+ multi->num_stripes = 1;
+ stripe_index = 0;
+ if (map.type & BTRFS_BLOCK_GROUP_RAID1) {
+ if (mirror_num)
+ stripe_index = mirror_num - 1;
+ else
+ stripe_index = stripe_nr % map.num_stripes;
+ } else if (map.type & BTRFS_BLOCK_GROUP_RAID10) {
+ int factor = map.num_stripes / map.sub_stripes;
+
+ stripe_index = stripe_nr % factor;
+ stripe_index *= map.sub_stripes;
+
+ if (mirror_num)
+ stripe_index += mirror_num - 1;
+ else
+ stripe_index = stripe_nr % map.sub_stripes;
+
+ stripe_nr = stripe_nr / factor;
+ } else if (map.type & BTRFS_BLOCK_GROUP_DUP) {
+ if (mirror_num)
+ stripe_index = mirror_num - 1;
+ } else {
+ stripe_index = stripe_nr % map.num_stripes;
+ stripe_nr = stripe_nr / map.num_stripes;
+ }
+ WARN_ON(stripe_index >= map.num_stripes);
+
+ for (i = 0; i < multi->num_stripes; i++) {
+ multi->stripes[i].physical =
+ map.stripes[stripe_index].physical + stripe_offset +
+ stripe_nr * map.stripe_len;
+ stripe_index++;
+ }
+ return 0;
+}
+
+static u64 btrfs_map_block(u64 logical)
+{
+ int ret;
+ u64 length;
+ struct btrfs_multi_bio multi;
+
+ ret = __btrfs_map_block(logical, &length, &multi, 0);
+ if (ret) {
+ errnum = ERR_FSYS_CORRUPT;
+ return 0;
+ }
+ return multi.stripes[0].physical;
+}
+
+static int read_extent_from_disk(struct extent_buffer *eb)
+{
+ WARN_ON(eb->dev_bytenr % SECTOR_SHIFT);
+ return devread(eb->dev_bytenr >> SECTOR_SHIFT, 0, eb->len, eb->data);
+}
+
+static int verify_parent_transid(struct extent_buffer *eb, u64 parent_transid)
+{
+ return parent_transid && (btrfs_header_generation(eb) !=
+parent_transid);
+}
+
+static int btrfs_num_copies(u64 logical, u64 len)
+{
+ return 1;
+}
+
+static int check_tree_block(struct btrfs_root *root, struct extent_buffer *buf)
+{
+ return 0;
+}
+
+static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
+ int verify)
+{
+ return 0;
+}
+
+/*
+ * Read a block of logical number @bytenr
+ * from disk to buffer @eb.
+ * Return 1 on success.
+ */
+int read_tree_block(struct btrfs_root *root,
+ struct extent_buffer *eb,
+ u64 bytenr, /* logical */
+ u32 blocksize,
+ u64 parent_transid,
+ lookup_pool_id lpid)
+{
+ int ret;
+ int dev_nr;
+ u64 length;
+ struct btrfs_multi_bio multi;
+ int mirror_num = 0;
+ int num_copies;
+
+ dev_nr = 0;
+ length = blocksize;
+ while (1) {
+ ret = __btrfs_map_block(bytenr,
+ &length, &multi, mirror_num);
+ if (ret) {
+ errnum = ERR_FSYS_CORRUPT;
+ return 0;
+ }
+ init_extent_buffer(eb,
+ bytenr,
+ blocksize,
+ multi.stripes[0].physical,
+ lpid);
+
+ ret = read_extent_from_disk(eb);
+ if (ret &&
+ check_tree_block(root, eb) == 0 &&
+ csum_tree_block(root, eb, 1) == 0 &&
+ verify_parent_transid(eb, parent_transid) == 0)
+ return 1;
+
+ num_copies = btrfs_num_copies(eb->start, eb->len);
+ if (num_copies == 1)
+ break;
+ mirror_num++;
+ if (mirror_num > num_copies)
+ break;
+ }
+ return 0;
+}
+
+/*
+ * Read a child pointed by @slot node pointer
+ * of @parent. Put the result to @parent.
+ * Return 1 on success.
+ */
+static int parent2child(struct btrfs_root *root,
+ struct extent_buffer *parent,
+ int slot,
+ lookup_pool_id lpid)
+{
+ int level;
+
+ WARN_ON(slot < 0);
+ WARN_ON(slot >= btrfs_header_nritems(parent));
+
+ level = btrfs_header_level(parent);
+ WARN_ON(level <= 0);
+
+ return read_tree_block(root,
+ parent,
+ btrfs_node_blockptr(parent, slot),
+ btrfs_level_size(root, level - 1),
+ btrfs_node_ptr_generation(parent, slot),
+ lpid);
+}
+
+static int btrfs_comp_keys(struct btrfs_disk_key *disk, struct btrfs_key *k2)
+{
+ struct btrfs_key k1;
+
+ btrfs_disk_key_to_cpu(&k1, disk);
+
+ if (k1.objectid > k2->objectid)
+ return 1;
+ if (k1.objectid < k2->objectid)
+ return -1;
+ if (k1.type > k2->type)
+ return 1;
+ if (k1.type < k2->type)
+ return -1;
+ if (k1.offset > k2->offset)
+ return 1;
+ if (k1.offset < k2->offset)
+ return -1;
+ return 0;
+}
+
+static int bin_search(struct extent_buffer *eb, unsigned long p,
+ int item_size, struct btrfs_key *key,
+ int max, int *slot)
+{
+ int low = 0;
+ int high = max;
+ int mid;
+ int ret;
+ unsigned long offset;
+ struct btrfs_disk_key *tmp;
+
+ while(low < high) {
+ mid = (low + high) / 2;
+ offset = p + mid * item_size;
+
+ tmp = (struct btrfs_disk_key *)(eb->data + offset);
+ ret = btrfs_comp_keys(tmp, key);
+
+ if (ret < 0)
+ low = mid + 1;
+ else if (ret > 0)
+ high = mid;
+ else {
+ *slot = mid;
+ return 0;
+ }
+ }
+ *slot = low;
+ return 1;
+}
+
+/* look for a key in a node */
+static int node_lookup(struct extent_buffer *eb,
+ struct btrfs_key *key,
+ int *slot)
+{
+ if (btrfs_header_level(eb) == 0) {
+ return bin_search(eb,
+ offsetof(struct btrfs_leaf, items),
+ sizeof(struct btrfs_item),
+ key, btrfs_header_nritems(eb),
+ slot);
+ } else {
+ return bin_search(eb,
+ offsetof(struct btrfs_node, ptrs),
+ sizeof(struct btrfs_key_ptr),
+ key, btrfs_header_nritems(eb),
+ slot);
+ }
+ return -1;
+}
+
+static inline int check_node(struct extent_buffer *buf, int slot)
+{
+ return 0;
+}
+
+/*
+ * Look for an item by key in read-only tree.
+ * Return 0, if key was found. Return -1 on io errors.
+ *
+ * Preconditions: btrfs_mount already executed.
+ * Postconditions: if returned value is non-negative,
+ * then path[0] represents the found position in the
+ * tree. All components of the @path from leaf to root
+ * are valid except their data buffers (only path[0]
+ * has valid attached data buffer).
+ */
+
+int aux_tree_lookup(struct btrfs_root *root,
+ struct btrfs_key *key,
+ struct btrfs_path *path)
+{
+ int ret;
+ int slot = 0;
+ int level;
+ struct extent_buffer node;
+ init_extent_buffer(&node,
+ 0,
+ 0,
+ 0,
+ path->lpid);
+ copy_extent_buffer(&node, &root->node);
+ do {
+ level = btrfs_header_level(&node);
+ ret = check_node(&node, slot);
+ if (ret)
+ return -1;
+ move_extent_buffer(&path->nodes[level],
+ &node);
+ ret = node_lookup(&node, key, &slot);
+ if (ret < 0)
+ return ret;
+ if (level) {
+ /*
+ * non-leaf,
+ * jump to the next level
+ */
+ if (ret && slot > 0)
+ slot -= 1;
+ ret = parent2child(root, &node, slot, path->lpid);
+ if (ret == 0)
+ return -1;
+ }
+ path->slots[level] = slot;
+ } while (level);
+ return ret;
+}
+
+static int readup_buffer(struct extent_buffer *buf, lookup_pool_id lpid)
+{
+ buf->data = grab_lookup_cache(lpid);
+ return read_extent_from_disk(buf);
+}
+
+/*
+ * Find the next leaf in accordance with tree order;
+ * walk up the tree as far as required to find it.
+ * Returns 0 if something was found, or 1 if there
+ * are no greater leaves. Returns < 0 on io errors.
+ *
+ * Preconditions: all @path components from leaf to
+ * root have valid meta-data fields. path[0] has a
+ * valid attached data buffer with initial leaf.
+ * Postcondition: the same as above, but path[0] has
+ * an attached data buffer with the next leaf.
+ */
+static int btrfs_next_leaf(struct btrfs_root *root,
+ struct btrfs_path *path)
+{
+ int res;
+ int slot;
+ int level = 1;
+ struct extent_buffer *buf;
+
+ while(level < BTRFS_MAX_LEVEL) {
+ buf = &path->nodes[level];
+ slot = path->slots[level] + 1;
+ /*
+ * lift data on this level
+ */
+ res = readup_buffer(buf, path->lpid);
+ if (!res)
+ break;
+ if (slot >= btrfs_header_nritems(buf)) {
+ /* alas, go to parent (if any) */
+ level++;
+ res = 1;
+ continue;
+ }
+ break;
+ }
+ if (!res)
+ return 1;
+ /*
+ * At this level slot points to
+ * the subtree we are interested in.
+ */
+ path->slots[level] = slot;
+ while(level) {
+ struct extent_buffer tmp;
+ move_extent_buffer(&tmp, &path->nodes[level]);
+ res = parent2child(root, &tmp, slot, path->lpid);
+ if (res == 0)
+ return -1;
+ level --;
+ slot = 0;
+ move_extent_buffer(&path->nodes[level], &tmp);
+ path->slots[level] = slot;
+ }
+ return 0;
+}
+
+/* Preconditions: path is valid, data buffer
+ * is attached to leaf node.
+ * Postcondition: path is updated to point to
+ * the next position with respect to the tree
+ * order.
+ *
+ * Return -1 on io errors.
+ * Return 0, if next item was found.
+ * Return 1, if next item wasn't found (no more items).
+ */
+static int btrfs_next_item(struct btrfs_root *root,
+ struct btrfs_path *path)
+{
+ WARN_ON(path->slots[0] >= btrfs_header_nritems(&path->nodes[0]));
+
+ path->slots[0] += 1;
+
+ if (path->slots[0] < btrfs_header_nritems(&path->nodes[0]))
+ return 0;
+ if (coord_is_root(root, path))
+ /* no more items */
+ return 1;
+ return btrfs_next_leaf(root, path);
+}
+
+/*
+ * check if we can reuse results of previous
+ * search for read operation
+ */
+static int path_is_valid(struct btrfs_path *path,
+ struct btrfs_key *key)
+{
+ btrfs_item_key_to_cpu(&path->nodes[0],
+ key,
+ path->slots[0]);
+ return (key->objectid == BTRFS_FILE_INFO->objectid) &&
+ (btrfs_key_type(key) == BTRFS_EXTENT_DATA_KEY);
+}
+
+/* ->read_func() */
+int btrfs_read(char *buf, int len)
+{
+ int ret;
+ struct btrfs_root *fs_root;
+ struct btrfs_path *path;
+ struct btrfs_key *info_key;
+ struct btrfs_key path_key;
+ u64 off;
+ u64 bytes;
+ unsigned int to_read;
+ char *pos = buf;
+
+ fs_root = BTRFS_FS_ROOT;
+ info_key = BTRFS_FILE_INFO;
+ path = btrfs_grab_path(FIRST_EXTERNAL_LOOKUP_POOL);
+
+ if (!path_is_valid(path, &path_key)) {
+ btrfs_set_key_type(info_key, BTRFS_EXTENT_DATA_KEY);
+ info_key->offset = filepos;
+ ret = aux_tree_lookup(fs_root, info_key, path);
+ if (ret < 0)
+ errnum = ERR_FSYS_CORRUPT;
+ }
+ while (!errnum) {
+ struct btrfs_item *item;
+ struct btrfs_file_extent_item *fi;
+ unsigned int from;
+
+ if (!path_is_valid(path, &path_key))
+ break;
+ item = btrfs_item_nr(&path->nodes[0], path->slots[0]);
+ fi = btrfs_item_ptr(&path->nodes[0],
+ path->slots[0],
+ struct btrfs_file_extent_item);
+ if (btrfs_file_extent_compression(&path->nodes[0], fi)) {
+ btrfs_msg("Btrfs transparent compression unsupported\n");
+ errnum = ERR_BAD_FILETYPE;
+ goto exit;
+ }
+ off = filepos - path_key.offset;
+
+ switch (btrfs_file_extent_type(&path->nodes[0], fi)) {
+ case BTRFS_FILE_EXTENT_INLINE:
+ bytes = btrfs_file_extent_inline_item_len(&path->
+ nodes[0],
+ item);
+ to_read = bytes - off;
+ if (to_read > len)
+ to_read = len;
+ from = off + btrfs_file_extent_inline_start(fi);
+ if (disk_read_hook != NULL) {
+ disk_read_func = disk_read_hook;
+ ret = devread(path->nodes[0].dev_bytenr >>
+ SECTOR_SHIFT, from, to_read, pos);
+ disk_read_func = NULL;
+ } else {
+ memcpy(pos,
+ path->nodes[0].data + from,
+ to_read);
+ }
+ break;
+ case BTRFS_FILE_EXTENT_REG:
+ bytes = btrfs_file_extent_num_bytes(&path->nodes[0],
+ fi);
+ to_read = bytes - off;
+ if (to_read > len)
+ to_read = len;
+ from = off +
+ btrfs_file_extent_disk_bytenr(&path->nodes[0],
+ fi);
+ disk_read_func = disk_read_hook;
+ ret = devread(btrfs_map_block(from) >> SECTOR_SHIFT,
+ from & ((u64)SECTOR_SIZE - 1),
+ to_read,
+ pos);
+ disk_read_func = NULL;
+ if (!ret)
+ goto exit;
+ break;
+ case BTRFS_FILE_EXTENT_PREALLOC:
+ btrfs_msg("Btrfs preallocated extents unsupported\n");
+ errnum = ERR_BAD_FILETYPE;
+ goto exit;
+ default:
+ errnum = ERR_FSYS_CORRUPT;
+ goto exit;
+ }
+ len -= to_read;
+ pos += to_read;
+ filepos += to_read;
+ if (len == 0)
+ break;
+ /* not everything was read */
+ ret = btrfs_next_item(fs_root, path);
+ if (ret) {
+ /* something should be found */
+ errnum = ERR_FSYS_CORRUPT;
+ break;
+ }
+ }
+ exit:
+ return errnum ? 0 : pos - buf;
+}
+
+static int btrfs_follow_link(struct btrfs_root *root,
+ struct btrfs_path *path,
+ char **dirname, char *linkbuf,
+ int *link_count,
+ struct btrfs_inode_item *sd)
+{
+ int ret;
+ int len;
+ char *name = *dirname;
+
+ if (++(*link_count) > MAX_LINK_COUNT) {
+ errnum = ERR_SYMLINK_LOOP;
+ return 0;
+ }
+ /* calculate remaining name size */
+ filemax = btrfs_inode_size(&path->nodes[0], sd);
+ for (len = 0;
+ name[len] && isspace(name[len]);
+ len ++);
+
+ if (filemax + len > PATH_MAX - 1) {
+ errnum = ERR_FILELENGTH;
+ return 0;
+ }
+ grub_memmove(linkbuf + filemax, name, len + 1);
+ btrfs_update_file_info(path);
+ filepos = 0;
+ /* extract symlink content */
+ while (1) {
+ u64 oid = BTRFS_FILE_INFO->objectid;
+ ret = btrfs_next_item(root, path);
+ if (ret)
+ break;
+ btrfs_update_file_info(path);
+ if (oid != BTRFS_FILE_INFO->objectid)
+ break;
+ if (btrfs_key_type(BTRFS_FILE_INFO) ==
+ BTRFS_EXTENT_DATA_KEY)
+ goto found;
+ }
+ /* no target was found */
+ errnum = ERR_FSYS_CORRUPT;
+ return 0;
+ found:
+ /* fill the rest of linkbuf with the content */
+ ret = btrfs_read(linkbuf, filemax);
+ if (ret != filemax) {
+ errnum = ERR_FSYS_CORRUPT;
+ return 0;
+ }
+ return 1;
+}
+
+static int update_fs_root(struct btrfs_root *fs_root,
+ struct btrfs_key *location)
+{
+ int ret;
+ struct btrfs_root *tree_root;
+
+ if (location->offset != (u64)-1)
+ return 0;
+ tree_root = &fs_root->fs_info->tree_root;
+ ret = find_setup_root(tree_root,
+ tree_root->nodesize,
+ tree_root->leafsize,
+ tree_root->sectorsize,
+ tree_root->stripesize,
+ location->objectid,
+ fs_root,
+ 0,
+ 0,
+ 0,
+ SECOND_EXTERNAL_LOOKUP_POOL);
+ if (ret)
+ return ret;
+ location->objectid = btrfs_root_dirid(&fs_root->root_item);
+ btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
+ location->offset = 0;
+ return 0;
+}
+
+#ifndef STAGE1_5
+static inline void update_possibilities(void)
+{
+ if (print_possibilities > 0)
+ print_possibilities =
+ -print_possibilities;
+}
+#endif
+
+/*
+ * Look for a directory item by name.
+ * Print possibilities, if needed.
+ * Postconditions: on success @sd_key points
+ * to the key contained in the directory entry.
+ */
+static int btrfs_de_index_by_name(struct btrfs_root *root,
+ struct btrfs_path *path,
+ char **dirname,
+ struct btrfs_key *sd_key)
+{
+ char ch;
+ int ret;
+ char *rest;
+ struct btrfs_dir_item *di;
+#ifndef STAGE1_5
+ int do_possibilities = 0;
+#endif
+ for (; **dirname == '/'; (*dirname)++);
+ for (rest = *dirname;
+ (ch = *rest) && !isspace(ch) && ch != '/';
+ rest++);
+ *rest = 0; /* for substrung() */
+#ifndef STAGE1_5
+ if (print_possibilities && ch != '/')
+ do_possibilities = 1;
+#endif
+ /* scan a directory */
+ while (1) {
+ u32 total;
+ u32 cur = 0;
+ u32 len;
+ struct btrfs_key di_key;
+ struct btrfs_disk_key location;
+ struct btrfs_item *item;
+
+ /* extract next dir entry */
+ ret = btrfs_next_item(root, path);
+ if (ret)
+ break;
+ item = btrfs_item_nr(&path->nodes[0],
+ path->slots[0]);
+ btrfs_item_key_to_cpu(&path->nodes[0],
+ &di_key,
+ path->slots[0]);
+ if (di_key.objectid != sd_key->objectid)
+ /* no more entries */
+ break;
+ di = btrfs_item_ptr(&path->nodes[0],
+ path->slots[0],
+ struct btrfs_dir_item);
+ /*
+ * working around special cases:
+ * btrfs doesn't maintain directory entries
+ * which contain names "." and ".."
+ */
+ if (!substring(".", *dirname)) {
+#ifndef STAGE1_5
+ if (do_possibilities) {
+ update_possibilities();
+ return 1;
+ }
+#endif
+ goto found;
+ }
+ if (!substring("..", *dirname)) {
+ if (di_key.type != BTRFS_INODE_REF_KEY)
+ continue;
+ sd_key->objectid = di_key.offset;
+ btrfs_set_key_type(sd_key, BTRFS_INODE_ITEM_KEY);
+ sd_key->offset = 0;
+#ifndef STAGE1_5
+ if (do_possibilities) {
+ update_possibilities();
+ return 1;
+ }
+#endif
+ goto found;
+ }
+ if (di_key.type != BTRFS_DIR_ITEM_KEY)
+ continue;
+ total = btrfs_item_size(&path->nodes[0], item);
+ /* scan a directory item */
+ while (cur < total) {
+ char tmp;
+ int result;
+ char *filename;
+ char *end_of_name;
+ int name_len;
+ int data_len;
+
+ btrfs_dir_item_key(&path->nodes[0], di, &location);
+
+ name_len = btrfs_dir_name_len(&path->nodes[0], di);
+ data_len = btrfs_dir_data_len(&path->nodes[0], di);
+
+ WARN_ON(name_len > BTRFS_NAME_LEN);
+
+ filename = (char *)(path->nodes[0].data +
+ (unsigned long)(di + 1));
+ end_of_name = filename + name_len;
+ /*
+ * working around not null-terminated
+ * directory names in btrfs: just
+ * a short-term overwrite of the
+ * cache with the following rollback
+ * of the change.
+ */
+ tmp = *end_of_name;
+ *end_of_name = 0;
+ result = substring(*dirname, filename);
+ *end_of_name = tmp;
+#ifndef STAGE1_5
+ if (do_possibilities) {
+ if (result <= 0) {
+ update_possibilities();
+ *end_of_name = 0;
+ print_a_completion(filename);
+ *end_of_name = tmp;
+ }
+ }
+ else
+#endif
+ if (result == 0) {
+ btrfs_dir_item_key_to_cpu(&path->nodes[0],
+ di, sd_key);
+ goto found;
+ }
+ len = sizeof(*di) + name_len + data_len;
+ di = (struct btrfs_dir_item *)((char *)di + len);
+ cur += len;
+ }
+ }
+#ifndef STAGE1_5
+ if (print_possibilities < 0)
+ return 1;
+#endif
+ errnum = ERR_FILE_NOT_FOUND;
+ *rest = ch;
+ return 0;
+ found:
+ *rest = ch;
+ *dirname = rest;
+ return 1;
+}
+
+/*
+ * ->dir_func().
+ * Postcondition: on a non-zero return &btrfs_fs_info
+ * contains the latest fs_root of file's subvolume.
+ * &btrfs_fs_info points to a subvolume of a file we
+ * were trying to look up.
+ * BTRFS_FILE_INFO contains info of the file we were
+ * trying to look up.
+ */
+
+int btrfs_dir(char *dirname)
+{
+ int ret;
+ int mode;
+ u64 size;
+ int linkcount = 0;
+ char linkbuf[PATH_MAX];
+
+ struct btrfs_path *path;
+ struct btrfs_root *root;
+
+ struct btrfs_key sd_key;
+ struct btrfs_inode_item *sd;
+ struct btrfs_key parent_sd_key;
+
+ root = BTRFS_FS_ROOT;
+ path = btrfs_grab_path(FIRST_EXTERNAL_LOOKUP_POOL);
+
+ btrfs_set_root_dir_key(&sd_key);
+ while (1) {
+ struct extent_buffer *leaf;
+ ret = aux_tree_lookup(root, &sd_key, path);
+ if (ret)
+ return 0;
+ leaf = &path->nodes[0];
+ sd = btrfs_item_ptr(leaf,
+ path->slots[0],
+ struct btrfs_inode_item);
+ mode = btrfs_inode_mode(leaf, sd);
+ size = btrfs_inode_size(leaf, sd);
+ switch (btrfs_get_file_type(mode)) {
+ case BTRFS_SYMLINK_FILE:
+ ret = btrfs_follow_link(root,
+ path,
+ &dirname,
+ linkbuf,
+ &linkcount,
+ sd);
+ if (!ret)
+ return 0;
+ dirname = linkbuf;
+ if (*dirname == '/')
+ /* absolute name */
+ btrfs_set_root_dir_key(&sd_key);
+ else
+ memcpy(&sd_key, &parent_sd_key,
+ sizeof(sd_key));
+ continue;
+ case BTRFS_REGULAR_FILE:
+ /*
+ * normally we want to exit here
+ */
+ if (*dirname && !isspace (*dirname)) {
+ errnum = ERR_BAD_FILETYPE;
+ return 0;
+ }
+ filepos = 0;
+ filemax = btrfs_inode_size(leaf, sd);
+ btrfs_update_file_info(path);
+ return 1;
+ case BTRFS_DIRECTORY_FILE:
+ memcpy(&parent_sd_key, &sd_key, sizeof(sd_key));
+ ret = btrfs_de_index_by_name(root,
+ path,
+ &dirname,
+ &sd_key);
+ if (!ret)
+ return 0;
+#ifndef STAGE1_5
+ if (print_possibilities < 0)
+ return 1;
+#endif
+ /*
+ * update fs_tree:
+ * subvolume stuff goes here
+ */
+ ret = update_fs_root(root, &sd_key);
+ if (ret)
+ return 0;
+ continue;
+ case BTRFS_UNKNOWN_FILE:
+ default:
+ btrfs_msg("Btrfs: bad file type\n");
+ errnum = ERR_BAD_FILETYPE;
+ return 0;
+ }
+ }
+}
+
+static void btrfs_load_config(com32sys_t *regs)
+{
+ char *config_name = "extlinux.conf";
+ com32sys_t out_regs;
+
+ strcpy(ConfigName, config_name);
+ *(uint32_t *)CurrentDirName = 0x00002f2e;
+
+ regs->edi.w[0] = OFFS_WRT(ConfigName, 0);
+ memset(&out_regs, 0, sizeof out_regs);
+ call16(core_open, regs, &out_regs);
+
+ regs->eax.w[0] = out_regs.eax.w[0];
+
+#if 0
+ printf("the zero flag is %s\n", regs->eax.w[0] ? \
+ "CLEAR, means we found the config file" :
+ "SET, menas we didn't find the config file");
+#endif
+}
+
+const struct fs_ops btrfs_fs_ops = {
+ .fs_name = "btrfs",
+ .fs_flags = 0,
+ .fs_init = btrfs_fs_init,
+ .searchdir = btrfs_searchdir,
+ .getfssec = btrfs_getfssec,
+ .close_file = btrfs_close_file,
+ .mangle_name = generic_mangle_name,
+ .unmangle_name = generic_unmangle_name,
+ .load_config = btrfs_load_config
+};
diff --git a/core/fs/btrfs/btrfs.h b/core/fs/btrfs/btrfs.h
new file mode 100644
index 00000000..8ace266a
--- /dev/null
+++ b/core/fs/btrfs/btrfs.h
@@ -0,0 +1,1416 @@
+/* btrfs.h - an extraction from btrfs-progs-0.18/ctree.h into one file
+ *
+ * Copyright (C) 2007 Oracle. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License v2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+#ifndef CORE_FS_BTRFS_H
+#define CORE_FS_BTRFS_H
+
+#include <stdint.h>
+
+typedef int8_t __s8;
+typedef uint8_t __u8;
+typedef int16_t __s16;
+typedef uint16_t __u16;
+typedef int32_t __s32;
+typedef uint32_t __u32;
+typedef int64_t __s64;
+typedef uint64_t __u64;
+
+typedef __s8 s8;
+typedef __u8 u8;
+typedef __u16 u16;
+typedef __u32 u32;
+typedef __u64 u64;
+typedef __s64 s64;
+
+#define __bitwise
+
+typedef u16 __bitwise __le16;
+typedef u32 __bitwise __le32;
+typedef u64 __bitwise __le64;
+
+/* linux/posix_type.h */
+typedef long linux_off_t;
+
+/* linux/little_endian.h */
+#define cpu_to_le64(x) ((__u64) (x))
+#define le64_to_cpu(x) ((__u64) (x))
+#define cpu_to_le32(x) ((__u32) (x))
+#define le32_to_cpu(x) ((__u32) (x))
+#define cpu_to_le16(x) ((__u16) (x))
+#define le16_to_cpu(x) ((__u16) (x))
+#define le8_to_cpu(x) ((__u8) (x))
+#define cpu_to_le8(x) ((__u8) (x))
+
+/* linux/stat.h */
+#define S_IFMT 00170000
+#define S_IFLNK 0120000
+#define S_IFREG 0100000
+#define S_IFDIR 0040000
+#define S_ISLNK(m) (((m) & S_IFMT) == S_IFLNK)
+#define S_ISREG(m) (((m) & S_IFMT) == S_IFREG)
+#define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
+
+struct btrfs_root;
+#define BTRFS_MAGIC "_BHRfS_M"
+
+#define BTRFS_SUPER_INFO_OFFSET (64 * 1024)
+#define BTRFS_SUPER_INFO_SIZE 4096
+
+#define BTRFS_SUPER_MIRROR_MAX 3
+#define BTRFS_SUPER_MIRROR_SHIFT 12
+
+#define PATH_MAX 1024 /* include/linux/limits.h */
+#define MAX_LINK_COUNT 5 /* number of symbolic links
+ to follow */
+#define BTRFS_MAX_LEVEL 8
+#define BTRFS_ROOT_TREE_OBJECTID 1ULL
+#define BTRFS_EXTENT_TREE_OBJECTID 2ULL
+#define BTRFS_CHUNK_TREE_OBJECTID 3ULL
+#define BTRFS_DEV_TREE_OBJECTID 4ULL
+#define BTRFS_FS_TREE_OBJECTID 5ULL
+#define BTRFS_ROOT_TREE_DIR_OBJECTID 6ULL
+#define BTRFS_CSUM_TREE_OBJECTID 7ULL
+
+#define BTRFS_ORPHAN_OBJECTID -5ULL
+#define BTRFS_TREE_LOG_OBJECTID -6ULL
+#define BTRFS_TREE_LOG_FIXUP_OBJECTID -7ULL
+#define BTRFS_TREE_RELOC_OBJECTID -8ULL
+#define BTRFS_DATA_RELOC_TREE_OBJECTID -9ULL
+#define BTRFS_EXTENT_CSUM_OBJECTID -10ULL
+
+#define BTRFS_MULTIPLE_OBJECTIDS -255ULL
+#define BTRFS_FIRST_FREE_OBJECTID 256ULL
+#define BTRFS_LAST_FREE_OBJECTID -256ULL
+#define BTRFS_FIRST_CHUNK_TREE_OBJECTID 256ULL
+#define BTRFS_DEV_ITEMS_OBJECTID 1ULL
+
+
+#define BTRFS_NAME_LEN 255
+#define BTRFS_CSUM_SIZE 32
+#define BTRFS_CSUM_TYPE_CRC32 0
+
+static int btrfs_csum_sizes[] = { 4, 0 };
+
+/* four bytes for CRC32 */
+#define BTRFS_CRC32_SIZE 4
+#define BTRFS_EMPTY_DIR_SIZE 0
+
+#define BTRFS_FT_UNKNOWN 0
+#define BTRFS_FT_REG_FILE 1
+#define BTRFS_FT_DIR 2
+#define BTRFS_FT_CHRDEV 3
+#define BTRFS_FT_BLKDEV 4
+#define BTRFS_FT_FIFO 5
+#define BTRFS_FT_SOCK 6
+#define BTRFS_FT_SYMLINK 7
+#define BTRFS_FT_XATTR 8
+#define BTRFS_FT_MAX 9
+
+#define BTRFS_UUID_SIZE 16
+
+#define BTRFS_DEFAULT_NUM_DEVICES 1
+#define BTRFS_DEFAULT_NODE_SIZE 4096
+#define BTRFS_DEFAULT_LEAF_SIZE 4096
+
+#define WARN_ON(c)
+#define cassert(cond) ({ switch (-1) { case (cond): case 0: break; } })
+#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
+
+struct btrfs_disk_key {
+ __le64 objectid;
+ u8 type;
+ __le64 offset;
+} __attribute__ ((__packed__));
+
+/* cpu key */
+struct btrfs_key {
+ u64 objectid;
+ u8 type;
+ u64 offset;
+} __attribute__ ((__packed__));
+
+/* this represents a divice in a chunk tree */
+struct btrfs_dev_item {
+ __le64 devid; /* internal device id */
+ __le64 total_bytes; /* size of the device */
+ __le64 bytes_used;
+ __le32 io_align; /* optimal io alignment */
+ __le32 io_width; /* optimal io width */
+ __le32 sector_size; /* minimal io size */
+ __le64 type; /* type and info about this device */
+ __le64 generation; /* expected generation */
+ __le64 start_offset; /* of the partition on a device */
+
+ /* info for allocation decisions */
+ __le32 dev_group;
+
+ u8 seek_speed; /* 0-100 (100 is fastest) */
+ u8 bandwidth; /* 0-100 (100 is fastest) */
+
+ u8 uuid[BTRFS_UUID_SIZE]; /* dev uuid generated by btrfs */
+ u8 fsid[BTRFS_UUID_SIZE]; /* uuid of the host FS */
+} __attribute__ ((__packed__));
+
+struct btrfs_stripe {
+ __le64 devid;
+ __le64 offset;
+ u8 dev_uuid[BTRFS_UUID_SIZE];
+} __attribute__ ((__packed__));
+
+struct btrfs_chunk {
+ /* size of this chunk in bytes */
+ __le64 length;
+ __le64 owner; /* objectid of the root referincing this chunk */
+ __le64 stripe_len;
+ __le64 type;
+ __le32 io_align; /* optimal io alignment for this chunk */
+ __le32 io_width; /* optimal io width for this chunk */
+ __le32 sector_size; /* minimal io size for this chunk */
+ __le16 num_stripes;
+ __le16 sub_stripes; /* sub stripes (for raid10) */
+ struct btrfs_stripe stripe;
+} __attribute__ ((__packed__));
+
+static inline unsigned long btrfs_chunk_item_size(int num_stripes)
+{
+ return sizeof(struct btrfs_chunk) +
+ sizeof(struct btrfs_stripe) * (num_stripes - 1);
+}
+
+#define BTRFS_FSID_SIZE 16
+#define BTRFS_HEADER_FLAG_WRITTEN (1 << 0)
+
+struct btrfs_header {
+ /* these first four must match the super block */
+ u8 csum[BTRFS_CSUM_SIZE];
+ u8 fsid[BTRFS_FSID_SIZE]; /* uuid of the host fs */
+ __le64 bytenr; /* which block this node is supposed to live in */
+ __le64 flags;
+
+ /* allowed to be different from the super from here on down */
+ u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
+ __le64 generation;
+ __le64 owner;
+ __le32 nritems;
+ u8 level;
+} __attribute__ ((__packed__));
+
+#define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
+ sizeof(struct btrfs_header)) / \
+ sizeof(struct btrfs_key_ptr))
+#define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
+#define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize))
+#define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
+ sizeof(struct btrfs_item) - \
+ sizeof(struct btrfs_file_extent_item))
+
+#define BTRFS_SUPER_FLAG_SEEDING (1ULL << 32)
+#define BTRFS_SUPER_FLAG_METADUMP (1ULL << 33)
+
+/*
+ * a portion of superblock which is used
+ * for chunk translation (up to 14 chunks
+ * with 3 stripes each.
+ */
+#define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
+#define BTRFS_LABEL_SIZE 256
+
+/*
+ * the super block basically lists the main trees of the FS
+ * it currently lacks any block count etc etc
+ */
+struct btrfs_super_block {
+ u8 csum[BTRFS_CSUM_SIZE];
+ /* the first 3 fields must match struct btrfs_header */
+ u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
+ __le64 bytenr; /* this block number */
+ __le64 flags;
+
+ /* allowed to be different from the btrfs_header from here own down */
+ __le64 magic;
+ __le64 generation;
+ __le64 root; /* tree root */
+ __le64 chunk_root;
+ __le64 log_root;
+
+ /* this will help find the new super based on the log root */
+ __le64 log_root_transid;
+ __le64 total_bytes;
+ __le64 bytes_used;
+ __le64 root_dir_objectid;
+ __le64 num_devices;
+ __le32 sectorsize;
+ __le32 nodesize;
+ __le32 leafsize;
+ __le32 stripesize;
+ __le32 sys_chunk_array_size;
+ __le64 chunk_root_generation;
+ __le64 compat_flags;
+ __le64 compat_ro_flags;
+ __le64 incompat_flags;
+ __le16 csum_type;
+ u8 root_level;
+ u8 chunk_root_level;
+ u8 log_root_level;
+ struct btrfs_dev_item dev_item;
+
+ char label[BTRFS_LABEL_SIZE];
+
+ /* future expansion */
+ __le64 reserved[32];
+ u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
+} __attribute__ ((__packed__));
+
+/*
+ * Compat flags that we support. If any incompat flags are set other than the
+ * ones specified below then we will fail to mount
+ */
+#define BTRFS_FEATURE_COMPAT_SUPP 0x0
+#define BTRFS_FEATURE_COMPAT_RO_SUPP 0x0
+#define BTRFS_FEATURE_INCOMPAT_SUPP 0x0
+
+/* Item header for per-leaf lookup */
+struct btrfs_item {
+ struct btrfs_disk_key key;
+ __le32 offset;
+ __le32 size;
+} __attribute__ ((__packed__));
+
+/*
+ * Format of the leaves:
+ * [item0, item1....itemN] [free space] [dataN...data1, data0]
+ */
+struct btrfs_leaf {
+ struct btrfs_header header;
+ struct btrfs_item items[];
+} __attribute__ ((__packed__));
+
+/*
+ * keys-pointers pairs for per-node (non-leaf) lookup
+ */
+struct btrfs_key_ptr {
+ struct btrfs_disk_key key;
+ __le64 blockptr;
+ __le64 generation;
+} __attribute__ ((__packed__));
+
+struct btrfs_node {
+ struct btrfs_header header;
+ struct btrfs_key_ptr ptrs[];
+} __attribute__ ((__packed__));
+
+struct extent_buffer {
+ /* metadata */
+ u64 start;
+ u64 dev_bytenr;
+ u32 len;
+ int refs;
+ int flags;
+ char *data;
+};
+
+static inline void read_extent_buffer(struct extent_buffer *eb,
+ void *dst, unsigned long start,
+ unsigned long len)
+{
+ memcpy(dst, eb->data + start, len);
+}
+
+static inline void write_extent_buffer(struct extent_buffer *eb,
+ const void *src, unsigned long start,
+ unsigned long len)
+{
+ memcpy(eb->data + start, src, len);
+}
+
+/*
+ * NOTE:
+ * don't increase a number of levels for grub-0.97!
+ */
+typedef enum {
+ FIRST_EXTERNAL_LOOKUP_POOL,
+ SECOND_EXTERNAL_LOOKUP_POOL,
+ INTERNAL_LOOKUP_POOL,
+ LAST_LOOKUP_POOL
+} lookup_pool_id;
+
+/* Relationship between lookup pools:
+ * depth
+ *
+ * ^ +----> INTERNAL <----+
+ * | | |
+ * | | |
+ * - FIRST_EXTERNAL SECOND_EXTERNAL
+ */
+
+struct btrfs_path {
+ lookup_pool_id lpid;
+ struct extent_buffer nodes[BTRFS_MAX_LEVEL];
+ int slots[BTRFS_MAX_LEVEL];
+};
+
+/*
+ * items in the extent btree are used to record the objectid of the
+ * owner of the block and the number of references
+ */
+struct btrfs_extent_item {
+ __le32 refs;
+} __attribute__ ((__packed__));
+
+struct btrfs_extent_ref {
+ __le64 root;
+ __le64 generation;
+ __le64 objectid;
+ __le32 num_refs;
+} __attribute__ ((__packed__));
+
+/* dev extents record free space on individual devices. The owner
+ * field points back to the chunk allocation mapping tree that allocated
+ * the extent. The chunk tree uuid field is a way to double check the owner
+ */
+struct btrfs_dev_extent {
+ __le64 chunk_tree;
+ __le64 chunk_objectid;
+ __le64 chunk_offset;
+ __le64 length;
+ u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
+} __attribute__ ((__packed__));
+
+struct btrfs_inode_ref {
+ __le64 index;
+ __le16 name_len;
+ /* name goes here */
+} __attribute__ ((__packed__));
+
+struct btrfs_timespec {
+ __le64 sec;
+ __le32 nsec;
+} __attribute__ ((__packed__));
+
+typedef enum {
+ BTRFS_COMPRESS_NONE = 0,
+ BTRFS_COMPRESS_ZLIB = 1,
+ BTRFS_COMPRESS_LAST = 2,
+} btrfs_compression_type;
+
+/* we don't understand any encryption methods right now */
+typedef enum {
+ BTRFS_ENCRYPTION_NONE = 0,
+ BTRFS_ENCRYPTION_LAST = 1,
+} btrfs_encryption_type;
+
+struct btrfs_inode_item {
+ /* nfs style generation number */
+ __le64 generation;
+ /* transid that last touched this inode */
+ __le64 transid;
+ __le64 size;
+ __le64 nbytes;
+ __le64 block_group;
+ __le32 nlink;
+ __le32 uid;
+ __le32 gid;
+ __le32 mode;
+ __le64 rdev;
+ __le64 flags;
+
+ /* modification sequence number for NFS */
+ __le64 sequence;
+
+ /*
+ * a little future expansion, for more than this we can
+ * just grow the inode item and version it
+ */
+ __le64 reserved[4];
+ struct btrfs_timespec atime;
+ struct btrfs_timespec ctime;
+ struct btrfs_timespec mtime;
+ struct btrfs_timespec otime;
+} __attribute__ ((__packed__));
+
+struct btrfs_dir_item {
+ struct btrfs_disk_key location;
+ __le64 transid;
+ __le16 data_len;
+ __le16 name_len;
+ u8 type;
+} __attribute__ ((__packed__));
+
+struct btrfs_root_item {
+ struct btrfs_inode_item inode;
+ __le64 generation;
+ __le64 root_dirid;
+ __le64 bytenr;
+ __le64 byte_limit;
+ __le64 bytes_used;
+ __le64 last_snapshot;
+ __le64 flags;
+ __le32 refs;
+ struct btrfs_disk_key drop_progress;
+ u8 drop_level;
+ u8 level;
+} __attribute__ ((__packed__));
+
+/*
+ * this is used for both forward and backward root refs
+ */
+struct btrfs_root_ref {
+ __le64 dirid;
+ __le64 sequence;
+ __le16 name_len;
+} __attribute__ ((__packed__));
+
+#define BTRFS_FILE_EXTENT_INLINE 0
+#define BTRFS_FILE_EXTENT_REG 1
+#define BTRFS_FILE_EXTENT_PREALLOC 2
+
+struct btrfs_file_extent_item {
+ /*
+ * transaction id that created this extent
+ */
+ __le64 generation;
+ /*
+ * max number of bytes to hold this extent in ram
+ * when we split a compressed extent we can't know how big
+ * each of the resulting pieces will be. So, this is
+ * an upper limit on the size of the extent in ram instead of
+ * an exact limit.
+ */
+ __le64 ram_bytes;
+
+ /*
+ * 32 bits for the various ways we might encode the data,
+ * including compression and encryption. If any of these
+ * are set to something a given disk format doesn't understand
+ * it is treated like an incompat flag for reading and writing,
+ * but not for stat.
+ */
+ u8 compression;
+ u8 encryption;
+ __le16 other_encoding; /* spare for later use */
+
+ /* are we inline data or a real extent? */
+ u8 type;
+
+ /*
+ * disk space consumed by the extent, checksum blocks are included
+ * in these numbers
+ */
+ __le64 disk_bytenr;
+ __le64 disk_num_bytes;
+ /*
+ * the logical offset in file blocks (no csums)
+ * this extent record is for. This allows a file extent to point
+ * into the middle of an existing extent on disk, sharing it
+ * between two snapshots (useful if some bytes in the middle of the
+ * extent have changed
+ */
+ __le64 offset;
+ /*
+ * the logical number of file blocks (no csums included)
+ */
+ __le64 num_bytes;
+
+} __attribute__ ((__packed__));
+
+struct btrfs_csum_item {
+ u8 csum;
+} __attribute__ ((__packed__));
+
+/* tag for the radix tree of block groups in ram */
+#define BTRFS_BLOCK_GROUP_DATA (1 << 0)
+#define BTRFS_BLOCK_GROUP_SYSTEM (1 << 1)
+#define BTRFS_BLOCK_GROUP_METADATA (1 << 2)
+#define BTRFS_BLOCK_GROUP_RAID0 (1 << 3)
+#define BTRFS_BLOCK_GROUP_RAID1 (1 << 4)
+#define BTRFS_BLOCK_GROUP_DUP (1 << 5)
+#define BTRFS_BLOCK_GROUP_RAID10 (1 << 6)
+
+struct btrfs_block_group_item {
+ __le64 used;
+ __le64 chunk_objectid;
+ __le64 flags;
+} __attribute__ ((__packed__));
+
+/*
+ * in ram representation of the tree. extent_root is used for all allocations
+ * and for the extent tree extent_root root.
+ */
+struct btrfs_root {
+ struct extent_buffer node;
+ char data[4096];
+ struct extent_buffer *commit_root;
+ struct btrfs_root_item root_item;
+ struct btrfs_key root_key;
+ struct btrfs_fs_info *fs_info;
+ u64 objectid;
+ u64 last_trans;
+
+ /* data allocations are done in sectorsize units */
+ u32 sectorsize;
+
+ /* node allocations are done in nodesize units */
+ u32 nodesize;
+
+ /* leaf allocations are done in leafsize units */
+ u32 leafsize;
+
+ /* leaf allocations are done in leafsize units */
+ u32 stripesize;
+
+ int ref_cows;
+ int track_dirty;
+
+
+ u32 type;
+ u64 highest_inode;
+ u64 last_inode_alloc;
+};
+
+struct btrfs_root;
+struct btrfs_fs_devices;
+struct btrfs_fs_info {
+ u8 fsid[BTRFS_FSID_SIZE];
+ u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
+ struct btrfs_root fs_root;
+ struct btrfs_root tree_root;
+ struct btrfs_root chunk_root;
+
+ struct btrfs_key file_info; /* currently opened file */
+ struct btrfs_path paths [LAST_LOOKUP_POOL];
+
+ u64 generation;
+ u64 last_trans_committed;
+
+ u64 system_alloc_profile;
+ u64 alloc_start;
+
+ struct btrfs_super_block super_temp;
+ struct btrfs_super_block super_copy;
+
+ u64 super_bytenr;
+ u64 total_pinned;
+
+ int system_allocs;
+ int readonly;
+};
+
+/*
+ * inode items have the data typically returned from stat and store other
+ * info about object characteristics. There is one for every file and dir in
+ * the FS
+ */
+#define BTRFS_INODE_ITEM_KEY 1
+#define BTRFS_INODE_REF_KEY 12
+#define BTRFS_XATTR_ITEM_KEY 24
+#define BTRFS_ORPHAN_ITEM_KEY 48
+
+#define BTRFS_DIR_LOG_ITEM_KEY 60
+#define BTRFS_DIR_LOG_INDEX_KEY 72
+/*
+ * dir items are the name -> inode pointers in a directory. There is one
+ * for every name in a directory.
+ */
+#define BTRFS_DIR_ITEM_KEY 84
+#define BTRFS_DIR_INDEX_KEY 96
+
+/*
+ * extent data is for file data
+ */
+#define BTRFS_EXTENT_DATA_KEY 108
+
+/*
+ * csum items have the checksums for data in the extents
+ */
+#define BTRFS_CSUM_ITEM_KEY 120
+/*
+ * extent csums are stored in a separate tree and hold csums for
+ * an entire extent on disk.
+ */
+#define BTRFS_EXTENT_CSUM_KEY 128
+
+/*
+ * root items point to tree roots. There are typically in the root
+ * tree used by the super block to find all the other trees
+ */
+#define BTRFS_ROOT_ITEM_KEY 132
+
+/*
+ * root backrefs tie subvols and snapshots to the directory entries that
+ * reference them
+ */
+#define BTRFS_ROOT_BACKREF_KEY 144
+
+/*
+ * root refs make a fast index for listing all of the snapshots and
+ * subvolumes referenced by a given root. They point directly to the
+ * directory item in the root that references the subvol
+ */
+#define BTRFS_ROOT_REF_KEY 156
+
+/*
+ * extent items are in the extent map tree. These record which blocks
+ * are used, and how many references there are to each block
+ */
+#define BTRFS_EXTENT_ITEM_KEY 168
+#define BTRFS_EXTENT_REF_KEY 180
+
+/*
+ * block groups give us hints into the extent allocation trees. Which
+ * blocks are free etc etc
+ */
+#define BTRFS_BLOCK_GROUP_ITEM_KEY 192
+
+#define BTRFS_DEV_EXTENT_KEY 204
+#define BTRFS_DEV_ITEM_KEY 216
+#define BTRFS_CHUNK_ITEM_KEY 228
+
+/*
+ * string items are for debugging. They just store a short string of
+ * data in the FS
+ */
+#define BTRFS_STRING_ITEM_KEY 253
+/*
+ * Inode flags
+ */
+#define BTRFS_INODE_NODATASUM (1 << 0)
+#define BTRFS_INODE_NODATACOW (1 << 1)
+#define BTRFS_INODE_READONLY (1 << 2)
+
+#define read_eb_member(eb, ptr, type, member, result) ( \
+ read_extent_buffer(eb, (char *)(result), \
+ ((unsigned long)(ptr)) + \
+ offsetof(type, member), \
+ sizeof(((type *)0)->member)))
+
+#define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
+static inline u##bits btrfs_##name(struct extent_buffer *eb) \
+{ \
+ struct btrfs_header *h = (struct btrfs_header *)eb->data; \
+ return le##bits##_to_cpu(h->member); \
+} \
+static inline void btrfs_set_##name(struct extent_buffer *eb, \
+ u##bits val) \
+{ \
+ struct btrfs_header *h = (struct btrfs_header *)eb->data; \
+ h->member = cpu_to_le##bits(val); \
+}
+
+#define BTRFS_SETGET_FUNCS(name, type, member, bits) \
+static inline u##bits btrfs_##name(struct extent_buffer *eb, \
+ type *s) \
+{ \
+ unsigned long offset = (unsigned long)s; \
+ type *p = (type *) (eb->data + offset); \
+ return le##bits##_to_cpu(p->member); \
+} \
+static inline void btrfs_set_##name(struct extent_buffer *eb, \
+ type *s, u##bits val) \
+{ \
+ unsigned long offset = (unsigned long)s; \
+ type *p = (type *) (eb->data + offset); \
+ p->member = cpu_to_le##bits(val); \
+}
+
+#define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
+static inline u##bits btrfs_##name(type *s) \
+{ \
+ return le##bits##_to_cpu(s->member); \
+} \
+static inline void btrfs_set_##name(type *s, u##bits val) \
+{ \
+ s->member = cpu_to_le##bits(val); \
+}
+
+BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
+BTRFS_SETGET_FUNCS(device_total_bytes, struct btrfs_dev_item, total_bytes, 64);
+BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
+BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
+BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
+BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
+ start_offset, 64);
+BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
+BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
+BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
+BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
+BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
+BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
+
+BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
+ total_bytes, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
+ bytes_used, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
+ io_align, 32);
+BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
+ io_width, 32);
+BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
+ sector_size, 32);
+BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
+ dev_group, 32);
+BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
+ seek_speed, 8);
+BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
+ bandwidth, 8);
+BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
+ generation, 64);
+
+static inline char *btrfs_device_uuid(struct btrfs_dev_item *d)
+{
+ return (char *)d + offsetof(struct btrfs_dev_item, uuid);
+}
+
+static inline char *btrfs_device_fsid(struct btrfs_dev_item *d)
+{
+ return (char *)d + offsetof(struct btrfs_dev_item, fsid);
+}
+
+BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
+BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
+BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
+BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
+BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
+BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
+BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
+BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
+BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
+BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
+BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
+
+static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
+{
+ return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
+}
+
+BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
+ stripe_len, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
+ io_align, 32);
+BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
+ io_width, 32);
+BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
+ sector_size, 32);
+BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
+ num_stripes, 16);
+BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
+ sub_stripes, 16);
+BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
+
+static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
+ int nr)
+{
+ unsigned long offset = (unsigned long)c;
+ offset += offsetof(struct btrfs_chunk, stripe);
+ offset += nr * sizeof(struct btrfs_stripe);
+ return (struct btrfs_stripe *)offset;
+}
+
+static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
+{
+ return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
+}
+
+static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb,
+ struct btrfs_chunk *c, int nr)
+{
+ return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
+}
+
+static inline void btrfs_set_stripe_offset_nr(struct extent_buffer *eb,
+ struct btrfs_chunk *c, int nr,
+ u64 val)
+{
+ btrfs_set_stripe_offset(eb, btrfs_stripe_nr(c, nr), val);
+}
+
+static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb,
+ struct btrfs_chunk *c, int nr)
+{
+ return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
+}
+
+static inline void btrfs_set_stripe_devid_nr(struct extent_buffer *eb,
+ struct btrfs_chunk *c, int nr,
+ u64 val)
+{
+ btrfs_set_stripe_devid(eb, btrfs_stripe_nr(c, nr), val);
+}
+
+/* struct btrfs_block_group_item */
+BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
+ used, 64);
+BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
+ used, 64);
+BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid,
+ struct btrfs_block_group_item, chunk_objectid, 64);
+
+BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid,
+ struct btrfs_block_group_item, chunk_objectid, 64);
+BTRFS_SETGET_FUNCS(disk_block_group_flags,
+ struct btrfs_block_group_item, flags, 64);
+BTRFS_SETGET_STACK_FUNCS(block_group_flags,
+ struct btrfs_block_group_item, flags, 64);
+
+/* struct btrfs_inode_ref */
+BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
+BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
+
+/* struct btrfs_inode_item */
+BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
+BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
+BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
+BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
+BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
+BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
+BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
+BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
+BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
+BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
+BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
+BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
+
+BTRFS_SETGET_STACK_FUNCS(stack_inode_generation,
+ struct btrfs_inode_item, generation, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_inode_sequence,
+ struct btrfs_inode_item, generation, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_inode_size,
+ struct btrfs_inode_item, size, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_inode_nbytes,
+ struct btrfs_inode_item, nbytes, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group,
+ struct btrfs_inode_item, block_group, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink,
+ struct btrfs_inode_item, nlink, 32);
+BTRFS_SETGET_STACK_FUNCS(stack_inode_uid,
+ struct btrfs_inode_item, uid, 32);
+BTRFS_SETGET_STACK_FUNCS(stack_inode_gid,
+ struct btrfs_inode_item, gid, 32);
+BTRFS_SETGET_STACK_FUNCS(stack_inode_mode,
+ struct btrfs_inode_item, mode, 32);
+BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev,
+ struct btrfs_inode_item, rdev, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_inode_flags,
+ struct btrfs_inode_item, flags, 64);
+
+BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
+BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
+BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec,
+ sec, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec,
+ nsec, 32);
+
+/* struct btrfs_dev_extent */
+BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
+ chunk_tree, 64);
+BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
+ chunk_objectid, 64);
+BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
+ chunk_offset, 64);
+BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
+
+static inline u8 *btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev)
+{
+ unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid);
+ return (u8 *)((unsigned long)dev + ptr);
+}
+
+/* struct btrfs_extent_ref */
+BTRFS_SETGET_FUNCS(ref_root, struct btrfs_extent_ref, root, 64);
+BTRFS_SETGET_FUNCS(ref_generation, struct btrfs_extent_ref, generation, 64);
+BTRFS_SETGET_FUNCS(ref_objectid, struct btrfs_extent_ref, objectid, 64);
+BTRFS_SETGET_FUNCS(ref_num_refs, struct btrfs_extent_ref, num_refs, 32);
+
+BTRFS_SETGET_STACK_FUNCS(stack_ref_root, struct btrfs_extent_ref, root, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_ref_generation, struct btrfs_extent_ref,
+ generation, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_ref_objectid, struct btrfs_extent_ref,
+ objectid, 64);
+BTRFS_SETGET_STACK_FUNCS(stack_ref_num_refs, struct btrfs_extent_ref,
+ num_refs, 32);
+
+/* struct btrfs_extent_item */
+BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 32);
+BTRFS_SETGET_STACK_FUNCS(stack_extent_refs, struct btrfs_extent_item,
+ refs, 32);
+
+/* struct btrfs_node */
+BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
+BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
+
+static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
+{
+ unsigned long ptr;
+ ptr = offsetof(struct btrfs_node, ptrs) +
+ sizeof(struct btrfs_key_ptr) * nr;
+ return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
+}
+
+static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
+ int nr, u64 val)
+{
+ unsigned long ptr;
+ ptr = offsetof(struct btrfs_node, ptrs) +
+ sizeof(struct btrfs_key_ptr) * nr;
+ btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
+}
+
+static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
+{
+ unsigned long ptr;
+ ptr = offsetof(struct btrfs_node, ptrs) +
+ sizeof(struct btrfs_key_ptr) * nr;
+ return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
+}
+
+static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
+ int nr, u64 val)
+{
+ unsigned long ptr;
+ ptr = offsetof(struct btrfs_node, ptrs) +
+ sizeof(struct btrfs_key_ptr) * nr;
+ btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
+}
+
+static inline unsigned long btrfs_node_key_ptr_offset(int nr)
+{
+ return offsetof(struct btrfs_node, ptrs) +
+ sizeof(struct btrfs_key_ptr) * nr;
+}
+
+static inline void btrfs_node_key(struct extent_buffer *eb,
+ struct btrfs_disk_key *disk_key, int nr)
+{
+ unsigned long ptr;
+ ptr = btrfs_node_key_ptr_offset(nr);
+ read_eb_member(eb, (struct btrfs_key_ptr *)ptr,
+ struct btrfs_key_ptr, key, disk_key);
+}
+
+/* struct btrfs_item */
+BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
+BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
+
+static inline unsigned long btrfs_item_nr_offset(int nr)
+{
+ return offsetof(struct btrfs_leaf, items) +
+ sizeof(struct btrfs_item) * nr;
+}
+
+static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
+ int nr)
+{
+ return (struct btrfs_item *)btrfs_item_nr_offset(nr);
+}
+
+static inline u32 btrfs_item_end(struct extent_buffer *eb,
+ struct btrfs_item *item)
+{
+ return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
+}
+
+static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
+{
+ return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
+}
+
+static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
+{
+ return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
+}
+
+static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
+{
+ return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
+}
+
+static inline void btrfs_item_key(struct extent_buffer *eb,
+ struct btrfs_disk_key *disk_key, int nr)
+{
+ struct btrfs_item *item = btrfs_item_nr(eb, nr);
+ read_eb_member(eb, item, struct btrfs_item, key, disk_key);
+}
+
+/*
+ * struct btrfs_root_ref
+ */
+BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
+BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
+BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
+
+/* struct btrfs_dir_item */
+BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
+BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
+BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
+BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
+
+static inline void btrfs_dir_item_key(struct extent_buffer *eb,
+ struct btrfs_dir_item *item,
+ struct btrfs_disk_key *key)
+{
+ read_eb_member(eb, item, struct btrfs_dir_item, location, key);
+}
+
+/* struct btrfs_disk_key */
+BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
+ objectid, 64);
+BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
+BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
+
+static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
+ struct btrfs_disk_key *disk)
+{
+ cpu->offset = le64_to_cpu(disk->offset);
+ cpu->type = disk->type;
+ cpu->objectid = le64_to_cpu(disk->objectid);
+}
+
+static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
+ struct btrfs_key *cpu)
+{
+ disk->offset = cpu_to_le64(cpu->offset);
+ disk->type = cpu->type;
+ disk->objectid = cpu_to_le64(cpu->objectid);
+}
+
+static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
+ struct btrfs_key *key, int nr)
+{
+ struct btrfs_disk_key disk_key;
+ btrfs_node_key(eb, &disk_key, nr);
+ btrfs_disk_key_to_cpu(key, &disk_key);
+}
+
+static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
+ struct btrfs_key *key, int nr)
+{
+ struct btrfs_disk_key disk_key;
+ btrfs_item_key(eb, &disk_key, nr);
+ btrfs_disk_key_to_cpu(key, &disk_key);
+}
+
+static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
+ struct btrfs_dir_item *item,
+ struct btrfs_key *key)
+{
+ struct btrfs_disk_key disk_key;
+ btrfs_dir_item_key(eb, item, &disk_key);
+ btrfs_disk_key_to_cpu(key, &disk_key);
+}
+
+static inline u8 btrfs_key_type(struct btrfs_key *key)
+{
+ return key->type;
+}
+
+static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
+{
+ key->type = val;
+}
+
+/* struct btrfs_header */
+BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
+BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
+ generation, 64);
+BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
+BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
+BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
+BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
+
+/* struct btrfs_root_item */
+BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
+ generation, 64);
+BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
+BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
+BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
+
+BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
+ generation, 64);
+BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
+BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
+BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
+BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
+BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
+BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
+BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
+BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
+ last_snapshot, 64);
+
+/* struct btrfs_super_block */
+
+BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
+BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
+BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
+ generation, 64);
+BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
+BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
+ struct btrfs_super_block, sys_chunk_array_size, 32);
+BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
+ struct btrfs_super_block, chunk_root_generation, 64);
+BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
+ root_level, 8);
+BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
+ chunk_root, 64);
+BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
+ chunk_root_level, 8);
+BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
+ log_root, 64);
+BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
+ log_root_transid, 64);
+BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
+ log_root_level, 8);
+BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
+ total_bytes, 64);
+BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
+ bytes_used, 64);
+BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
+ sectorsize, 32);
+BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
+ nodesize, 32);
+BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
+ leafsize, 32);
+BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
+ stripesize, 32);
+BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
+ root_dir_objectid, 64);
+BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
+ num_devices, 64);
+BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
+ compat_flags, 64);
+BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
+ compat_flags, 64);
+BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
+ incompat_flags, 64);
+BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
+ csum_type, 16);
+
+static inline int btrfs_super_csum_size(struct btrfs_super_block *s)
+{
+ int t = btrfs_super_csum_type(s);
+ //BUG_ON(t >= ARRAY_SIZE(btrfs_csum_sizes));
+ return btrfs_csum_sizes[t];
+}
+
+static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
+{
+ return offsetof(struct btrfs_leaf, items);
+}
+
+/* struct btrfs_file_extent_item */
+BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
+
+static inline unsigned long btrfs_file_extent_inline_start(struct
+ btrfs_file_extent_item *e)
+{
+ unsigned long offset = (unsigned long)e;
+ offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
+ return offset;
+}
+
+static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
+{
+ return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
+}
+
+BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
+ disk_bytenr, 64);
+BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
+ generation, 64);
+BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
+ disk_num_bytes, 64);
+BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
+ offset, 64);
+BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
+ num_bytes, 64);
+BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
+ ram_bytes, 64);
+BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
+ compression, 8);
+BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
+ encryption, 8);
+BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
+ other_encoding, 16);
+
+/* this returns the number of file bytes represented by the inline item.
+ * If an item is compressed, this is the uncompressed size
+ */
+static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
+ struct btrfs_file_extent_item *e)
+{
+ return btrfs_file_extent_ram_bytes(eb, e);
+}
+
+/*
+ * this returns the number of bytes used by the item on disk, minus the
+ * size of any extent headers. If a file is compressed on disk, this is
+ * the compressed size
+ */
+static inline u32 btrfs_file_extent_inline_item_len(struct extent_buffer *eb,
+ struct btrfs_item *e)
+{
+ unsigned long offset;
+ offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
+ return btrfs_item_size(eb, e) - offset;
+}
+
+static inline u32 btrfs_level_size(struct btrfs_root *root, int level) {
+ if (level == 0)
+ return root->leafsize;
+ return root->nodesize;
+}
+
+static inline u32 btrfs_root_level_size(struct btrfs_super_block *sb) {
+ return btrfs_super_root_level(sb) == 0 ?
+ btrfs_super_leafsize(sb) :
+ btrfs_super_nodesize(sb);
+}
+
+static inline u32 btrfs_chunk_root_level_size(struct btrfs_super_block *sb) {
+ return btrfs_super_chunk_root_level(sb) == 0 ?
+ btrfs_super_leafsize(sb) :
+ btrfs_super_nodesize(sb);
+}
+
+/* helper function to cast into the data area of the leaf. */
+#define btrfs_item_ptr(leaf, slot, type) \
+ ((type *)(btrfs_leaf_data(leaf) + \
+ btrfs_item_offset_nr(leaf, slot)))
+
+#define btrfs_item_ptr_offset(leaf, slot) \
+ ((unsigned long)(btrfs_leaf_data(leaf) + \
+ btrfs_item_offset_nr(leaf, slot)))
+
+/*volumes.h */
+
+struct btrfs_fs_devices {
+ u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
+
+ /* the device with this id has the most recent coyp of the super */
+ u64 latest_devid;
+ u64 latest_trans;
+ u64 lowest_devid;
+ int latest_bdev;
+ int lowest_bdev;
+ int seeding;
+ struct btrfs_fs_devices *seed;
+};
+
+struct btrfs_bio_stripe {
+ u64 physical;
+};
+
+#define MAX_NRSTRIPES 8
+struct btrfs_multi_bio {
+ int error;
+ int num_stripes;
+ struct btrfs_bio_stripe stripes[MAX_NRSTRIPES];
+};
+
+#define btrfs_multi_bio_size(n) (sizeof(struct btrfs_multi_bio) + \
+ (sizeof(struct btrfs_bio_stripe) * (n)))
+
+static int aux_tree_lookup(struct btrfs_root *root,
+ struct btrfs_key *key,
+ struct btrfs_path *path);
+
+struct cache_extent {
+ u64 start;
+ u64 size;
+};
+
+struct map_lookup {
+ struct cache_extent ce;
+ u64 type;
+ int io_align;
+ int io_width;
+ int stripe_len;
+ int sector_size;
+ int num_stripes;
+ int sub_stripes;
+ struct btrfs_bio_stripe stripes[MAX_NRSTRIPES];
+};
+
+/* "VFS" things */
+
+/* file types recognized by grub */
+typedef enum {
+ BTRFS_REGULAR_FILE,
+ BTRFS_DIRECTORY_FILE,
+ BTRFS_SYMLINK_FILE,
+ BTRFS_UNKNOWN_FILE
+} btrfs_file_type;
+
+static inline int coord_is_root(struct btrfs_root *root,
+ struct btrfs_path *path)
+{
+ return btrfs_header_bytenr(&path->nodes[0]) ==
+ btrfs_header_bytenr(&root->node);
+}
+
+static inline btrfs_file_type btrfs_get_file_type (int mode)
+{
+ if (S_ISLNK(mode))
+ return BTRFS_SYMLINK_FILE;
+ if (S_ISREG(mode))
+ return BTRFS_REGULAR_FILE;
+ if (S_ISDIR(mode))
+ return BTRFS_DIRECTORY_FILE;
+ return BTRFS_UNKNOWN_FILE;
+}
+
+#define min_t(type,x,y) \
+ ({ type __x = (x); type __y = (y); __x < __y ? __x: __y; })
+#define max_t(type,x,y) \
+ ({ type __x = (x); type __y = (y); __x > __y ? __x: __y; })
+
+
+int sys_array_lookup(struct map_lookup *map, u64 logical);
+int tree_chunk_lookup(struct map_lookup *map,
+ u64 logical);
+int __btrfs_map_block(u64 logical, u64 *length,
+ struct btrfs_multi_bio *multi_ret, int mirror_num);
+int read_tree_block(struct btrfs_root *root,
+ struct extent_buffer *eb,
+ u64 bytenr, /* logical */
+ u32 blocksize,
+ u64 parent_transid,
+ lookup_pool_id lpid);
+int check_read_chunk(struct btrfs_key *key,
+ struct extent_buffer *leaf,
+ struct btrfs_chunk *chunk,
+ struct map_lookup *map,
+ u64 logical);
+
+#endif /* CORE_FS_BTRFS_H */
+
+/*
+ Local variables:
+ c-indentation-style: "K&R"
+ mode-name: "LC"
+ c-basic-offset: 8
+ tab-width: 8
+ fill-column: 80
+ scroll-step: 1
+ End:
+*/
diff --git a/core/kernel.inc b/core/kernel.inc
index 9b888cc8..240661b1 100644
--- a/core/kernel.inc
+++ b/core/kernel.inc
@@ -94,6 +94,7 @@ syslinux_id equ 031h ; 3 = SYSLINUX family; 1 = SYSLINUX
pxelinux_id equ 032h ; 3 = SYSLINUX family; 2 = PXELINUX
isolinux_id equ 033h ; 3 = SYSLINUX family; 3 = ISOLINUX
extlinux_id equ 034h ; 3 = SYSLINUX family; 4 = EXTLINUX
+btrlinux_id equ 035h ; 3 = SYSLINUX family; 5 = BTRLINUX
;
; Types of vkernels
diff --git a/core/macros.inc b/core/macros.inc
index e3aedca1..7063c1bf 100644
--- a/core/macros.inc
+++ b/core/macros.inc
@@ -44,6 +44,25 @@
%else
%define IS_EXTLINUX 0
%endif
+%ifdef IS_BTRLINUX
+ %define MY_NAME 'BTRLINUX'
+%else
+ %define IS_BTRLINUX 0
+%endif
+
+;
+; Common attributes
+;
+%if IS_PXELINUX
+ %define IS_HD_BASED 0
+ %define IS_DISK_BASED 0
+%elif IS_ISOLINUX
+ %define IS_HD_BASED 0
+ %define IS_DISK_BASED 1
+%else
+ %define IS_HD_BASED 1
+ %define IS_DISK_BASED 1
+%endif
;
; Macros similar to res[bwd], but which works in the code segment (after