Btrfs: change integrity checker to support big blocks
authorStefan Behrens <sbehrens@giantdisaster.de>
Thu, 12 Apr 2012 10:53:40 +0000 (12:53 +0200)
committerJosef Bacik <josef@redhat.com>
Fri, 11 May 2012 14:56:40 +0000 (10:56 -0400)
The integrity checker used to be coded for nodesize == leafsize ==
sectorsize == PAGE_CACHE_SIZE.
This is now changed to support sizes for nodesize and leafsize which are
N * PAGE_CACHE_SIZE.

Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
fs/btrfs/check-integrity.c

index c053e90..7f6cc35 100644 (file)
 #define BTRFSIC_BLOCK_STACK_FRAME_MAGIC_NUMBER 20111300
 #define BTRFSIC_TREE_DUMP_MAX_INDENT_LEVEL (200 - 6)   /* in characters,
                                                         * excluding " [...]" */
-#define BTRFSIC_BLOCK_SIZE PAGE_SIZE
-
 #define BTRFSIC_GENERATION_UNKNOWN ((u64)-1)
 
 /*
@@ -210,8 +208,9 @@ struct btrfsic_block_data_ctx {
        u64 dev_bytenr;         /* physical bytenr on device */
        u32 len;
        struct btrfsic_dev_state *dev;
-       char *data;
-       struct buffer_head *bh; /* do not use if set to NULL */
+       char **datav;
+       struct page **pagev;
+       void *mem_to_free;
 };
 
 /* This structure is used to implement recursion without occupying
@@ -243,6 +242,8 @@ struct btrfsic_state {
        struct btrfs_root *root;
        u64 max_superblock_generation;
        struct btrfsic_block *latest_superblock;
+       u32 metablock_size;
+       u32 datablock_size;
 };
 
 static void btrfsic_block_init(struct btrfsic_block *b);
@@ -290,8 +291,10 @@ static int btrfsic_process_superblock(struct btrfsic_state *state,
 static int btrfsic_process_metablock(struct btrfsic_state *state,
                                     struct btrfsic_block *block,
                                     struct btrfsic_block_data_ctx *block_ctx,
-                                    struct btrfs_header *hdr,
                                     int limit_nesting, int force_iodone_flag);
+static void btrfsic_read_from_block_data(
+       struct btrfsic_block_data_ctx *block_ctx,
+       void *dst, u32 offset, size_t len);
 static int btrfsic_create_link_to_next_block(
                struct btrfsic_state *state,
                struct btrfsic_block *block,
@@ -318,12 +321,13 @@ static void btrfsic_release_block_ctx(struct btrfsic_block_data_ctx *block_ctx);
 static int btrfsic_read_block(struct btrfsic_state *state,
                              struct btrfsic_block_data_ctx *block_ctx);
 static void btrfsic_dump_database(struct btrfsic_state *state);
+static void btrfsic_complete_bio_end_io(struct bio *bio, int err);
 static int btrfsic_test_for_metadata(struct btrfsic_state *state,
-                                    const u8 *data, unsigned int size);
+                                    char **datav, unsigned int num_pages);
 static void btrfsic_process_written_block(struct btrfsic_dev_state *dev_state,
-                                         u64 dev_bytenr, u8 *mapped_data,
-                                         unsigned int len, struct bio *bio,
-                                         int *bio_is_patched,
+                                         u64 dev_bytenr, char **mapped_datav,
+                                         unsigned int num_pages,
+                                         struct bio *bio, int *bio_is_patched,
                                          struct buffer_head *bh,
                                          int submit_bio_bh_rw);
 static int btrfsic_process_written_superblock(
@@ -375,7 +379,7 @@ static struct btrfsic_dev_state *btrfsic_dev_state_lookup(
 static void btrfsic_cmp_log_and_dev_bytenr(struct btrfsic_state *state,
                                           u64 bytenr,
                                           struct btrfsic_dev_state *dev_state,
-                                          u64 dev_bytenr, char *data);
+                                          u64 dev_bytenr);
 
 static struct mutex btrfsic_mutex;
 static int btrfsic_is_initialized;
@@ -651,7 +655,7 @@ static int btrfsic_process_superblock(struct btrfsic_state *state,
        int pass;
 
        BUG_ON(NULL == state);
-       selected_super = kmalloc(sizeof(*selected_super), GFP_NOFS);
+       selected_super = kzalloc(sizeof(*selected_super), GFP_NOFS);
        if (NULL == selected_super) {
                printk(KERN_INFO "btrfsic: error, kmalloc failed!\n");
                return -1;
@@ -718,7 +722,7 @@ static int btrfsic_process_superblock(struct btrfsic_state *state,
 
                num_copies =
                    btrfs_num_copies(&state->root->fs_info->mapping_tree,
-                                    next_bytenr, PAGE_SIZE);
+                                    next_bytenr, state->metablock_size);
                if (state->print_mask & BTRFSIC_PRINT_MASK_NUM_COPIES)
                        printk(KERN_INFO "num_copies(log_bytenr=%llu) = %d\n",
                               (unsigned long long)next_bytenr, num_copies);
@@ -727,9 +731,9 @@ static int btrfsic_process_superblock(struct btrfsic_state *state,
                        struct btrfsic_block *next_block;
                        struct btrfsic_block_data_ctx tmp_next_block_ctx;
                        struct btrfsic_block_link *l;
-                       struct btrfs_header *hdr;
 
-                       ret = btrfsic_map_block(state, next_bytenr, PAGE_SIZE,
+                       ret = btrfsic_map_block(state, next_bytenr,
+                                               state->metablock_size,
                                                &tmp_next_block_ctx,
                                                mirror_num);
                        if (ret) {
@@ -758,7 +762,7 @@ static int btrfsic_process_superblock(struct btrfsic_state *state,
                        BUG_ON(NULL == l);
 
                        ret = btrfsic_read_block(state, &tmp_next_block_ctx);
-                       if (ret < (int)BTRFSIC_BLOCK_SIZE) {
+                       if (ret < (int)PAGE_CACHE_SIZE) {
                                printk(KERN_INFO
                                       "btrfsic: read @logical %llu failed!\n",
                                       (unsigned long long)
@@ -768,11 +772,9 @@ static int btrfsic_process_superblock(struct btrfsic_state *state,
                                return -1;
                        }
 
-                       hdr = (struct btrfs_header *)tmp_next_block_ctx.data;
                        ret = btrfsic_process_metablock(state,
                                                        next_block,
                                                        &tmp_next_block_ctx,
-                                                       hdr,
                                                        BTRFS_MAX_LEVEL + 3, 1);
                        btrfsic_release_block_ctx(&tmp_next_block_ctx);
                }
@@ -799,7 +801,10 @@ static int btrfsic_process_superblock_dev_mirror(
 
        /* super block bytenr is always the unmapped device bytenr */
        dev_bytenr = btrfs_sb_offset(superblock_mirror_num);
-       bh = __bread(superblock_bdev, dev_bytenr / 4096, 4096);
+       if (dev_bytenr + BTRFS_SUPER_INFO_SIZE > device->total_bytes)
+               return -1;
+       bh = __bread(superblock_bdev, dev_bytenr / 4096,
+                    BTRFS_SUPER_INFO_SIZE);
        if (NULL == bh)
                return -1;
        super_tmp = (struct btrfs_super_block *)
@@ -808,7 +813,10 @@ static int btrfsic_process_superblock_dev_mirror(
        if (btrfs_super_bytenr(super_tmp) != dev_bytenr ||
            strncmp((char *)(&(super_tmp->magic)), BTRFS_MAGIC,
                    sizeof(super_tmp->magic)) ||
-           memcmp(device->uuid, super_tmp->dev_item.uuid, BTRFS_UUID_SIZE)) {
+           memcmp(device->uuid, super_tmp->dev_item.uuid, BTRFS_UUID_SIZE) ||
+           btrfs_super_nodesize(super_tmp) != state->metablock_size ||
+           btrfs_super_leafsize(super_tmp) != state->metablock_size ||
+           btrfs_super_sectorsize(super_tmp) != state->datablock_size) {
                brelse(bh);
                return 0;
        }
@@ -893,7 +901,7 @@ static int btrfsic_process_superblock_dev_mirror(
 
                num_copies =
                    btrfs_num_copies(&state->root->fs_info->mapping_tree,
-                                    next_bytenr, PAGE_SIZE);
+                                    next_bytenr, state->metablock_size);
                if (state->print_mask & BTRFSIC_PRINT_MASK_NUM_COPIES)
                        printk(KERN_INFO "num_copies(log_bytenr=%llu) = %d\n",
                               (unsigned long long)next_bytenr, num_copies);
@@ -902,7 +910,8 @@ static int btrfsic_process_superblock_dev_mirror(
                        struct btrfsic_block_data_ctx tmp_next_block_ctx;
                        struct btrfsic_block_link *l;
 
-                       if (btrfsic_map_block(state, next_bytenr, PAGE_SIZE,
+                       if (btrfsic_map_block(state, next_bytenr,
+                                             state->metablock_size,
                                              &tmp_next_block_ctx,
                                              mirror_num)) {
                                printk(KERN_INFO "btrfsic: btrfsic_map_block("
@@ -966,13 +975,15 @@ static int btrfsic_process_metablock(
                struct btrfsic_state *state,
                struct btrfsic_block *const first_block,
                struct btrfsic_block_data_ctx *const first_block_ctx,
-               struct btrfs_header *const first_hdr,
                int first_limit_nesting, int force_iodone_flag)
 {
        struct btrfsic_stack_frame initial_stack_frame = { 0 };
        struct btrfsic_stack_frame *sf;
        struct btrfsic_stack_frame *next_stack;
+       struct btrfs_header *const first_hdr =
+               (struct btrfs_header *)first_block_ctx->datav[0];
 
+       BUG_ON(!first_hdr);
        sf = &initial_stack_frame;
        sf->error = 0;
        sf->i = -1;
@@ -1012,21 +1023,47 @@ continue_with_current_leaf_stack_frame:
                }
 
                if (sf->i < sf->nr) {
-                       struct btrfs_item *disk_item = leafhdr->items + sf->i;
-                       struct btrfs_disk_key *disk_key = &disk_item->key;
+                       struct btrfs_item disk_item;
+                       u32 disk_item_offset =
+                               (uintptr_t)(leafhdr->items + sf->i) -
+                               (uintptr_t)leafhdr;
+                       struct btrfs_disk_key *disk_key;
                        u8 type;
-                       const u32 item_offset = le32_to_cpu(disk_item->offset);
+                       u32 item_offset;
 
+                       if (disk_item_offset + sizeof(struct btrfs_item) >
+                           sf->block_ctx->len) {
+leaf_item_out_of_bounce_error:
+                               printk(KERN_INFO
+                                      "btrfsic: leaf item out of bounce at logical %llu, dev %s\n",
+                                      sf->block_ctx->start,
+                                      sf->block_ctx->dev->name);
+                               goto one_stack_frame_backwards;
+                       }
+                       btrfsic_read_from_block_data(sf->block_ctx,
+                                                    &disk_item,
+                                                    disk_item_offset,
+                                                    sizeof(struct btrfs_item));
+                       item_offset = le32_to_cpu(disk_item.offset);
+                       disk_key = &disk_item.key;
                        type = disk_key->type;
 
                        if (BTRFS_ROOT_ITEM_KEY == type) {
-                               const struct btrfs_root_item *const root_item =
-                                   (struct btrfs_root_item *)
-                                   (sf->block_ctx->data +
-                                    offsetof(struct btrfs_leaf, items) +
-                                    item_offset);
-                               const u64 next_bytenr =
-                                   le64_to_cpu(root_item->bytenr);
+                               struct btrfs_root_item root_item;
+                               u32 root_item_offset;
+                               u64 next_bytenr;
+
+                               root_item_offset = item_offset +
+                                       offsetof(struct btrfs_leaf, items);
+                               if (root_item_offset +
+                                   sizeof(struct btrfs_root_item) >
+                                   sf->block_ctx->len)
+                                       goto leaf_item_out_of_bounce_error;
+                               btrfsic_read_from_block_data(
+                                       sf->block_ctx, &root_item,
+                                       root_item_offset,
+                                       sizeof(struct btrfs_root_item));
+                               next_bytenr = le64_to_cpu(root_item.bytenr);
 
                                sf->error =
                                    btrfsic_create_link_to_next_block(
@@ -1041,7 +1078,7 @@ continue_with_current_leaf_stack_frame:
                                                &sf->num_copies,
                                                &sf->mirror_num,
                                                disk_key,
-                                               le64_to_cpu(root_item->
+                                               le64_to_cpu(root_item.
                                                generation));
                                if (sf->error)
                                        goto one_stack_frame_backwards;
@@ -1049,7 +1086,7 @@ continue_with_current_leaf_stack_frame:
                                if (NULL != sf->next_block) {
                                        struct btrfs_header *const next_hdr =
                                            (struct btrfs_header *)
-                                           sf->next_block_ctx.data;
+                                           sf->next_block_ctx.datav[0];
 
                                        next_stack =
                                            btrfsic_stack_frame_alloc();
@@ -1111,10 +1148,24 @@ continue_with_current_node_stack_frame:
                }
 
                if (sf->i < sf->nr) {
-                       struct btrfs_key_ptr *disk_key_ptr =
-                           nodehdr->ptrs + sf->i;
-                       const u64 next_bytenr =
-                           le64_to_cpu(disk_key_ptr->blockptr);
+                       struct btrfs_key_ptr key_ptr;
+                       u32 key_ptr_offset;
+                       u64 next_bytenr;
+
+                       key_ptr_offset = (uintptr_t)(nodehdr->ptrs + sf->i) -
+                                         (uintptr_t)nodehdr;
+                       if (key_ptr_offset + sizeof(struct btrfs_key_ptr) >
+                           sf->block_ctx->len) {
+                               printk(KERN_INFO
+                                      "btrfsic: node item out of bounce at logical %llu, dev %s\n",
+                                      sf->block_ctx->start,
+                                      sf->block_ctx->dev->name);
+                               goto one_stack_frame_backwards;
+                       }
+                       btrfsic_read_from_block_data(
+                               sf->block_ctx, &key_ptr, key_ptr_offset,
+                               sizeof(struct btrfs_key_ptr));
+                       next_bytenr = le64_to_cpu(key_ptr.blockptr);
 
                        sf->error = btrfsic_create_link_to_next_block(
                                        state,
@@ -1127,15 +1178,15 @@ continue_with_current_node_stack_frame:
                                        force_iodone_flag,
                                        &sf->num_copies,
                                        &sf->mirror_num,
-                                       &disk_key_ptr->key,
-                                       le64_to_cpu(disk_key_ptr->generation));
+                                       &key_ptr.key,
+                                       le64_to_cpu(key_ptr.generation));
                        if (sf->error)
                                goto one_stack_frame_backwards;
 
                        if (NULL != sf->next_block) {
                                struct btrfs_header *const next_hdr =
                                    (struct btrfs_header *)
-                                   sf->next_block_ctx.data;
+                                   sf->next_block_ctx.datav[0];
 
                                next_stack = btrfsic_stack_frame_alloc();
                                if (NULL == next_stack)
@@ -1181,6 +1232,35 @@ one_stack_frame_backwards:
        return sf->error;
 }
 
+static void btrfsic_read_from_block_data(
+       struct btrfsic_block_data_ctx *block_ctx,
+       void *dstv, u32 offset, size_t len)
+{
+       size_t cur;
+       size_t offset_in_page;
+       char *kaddr;
+       char *dst = (char *)dstv;
+       size_t start_offset = block_ctx->start & ((u64)PAGE_CACHE_SIZE - 1);
+       unsigned long i = (start_offset + offset) >> PAGE_CACHE_SHIFT;
+
+       WARN_ON(offset + len > block_ctx->len);
+       offset_in_page = (start_offset + offset) &
+                        ((unsigned long)PAGE_CACHE_SIZE - 1);
+
+       while (len > 0) {
+               cur = min(len, ((size_t)PAGE_CACHE_SIZE - offset_in_page));
+               BUG_ON(i >= (block_ctx->len + PAGE_CACHE_SIZE - 1) >>
+                           PAGE_CACHE_SHIFT);
+               kaddr = block_ctx->datav[i];
+               memcpy(dst, kaddr + offset_in_page, cur);
+
+               dst += cur;
+               len -= cur;
+               offset_in_page = 0;
+               i++;
+       }
+}
+
 static int btrfsic_create_link_to_next_block(
                struct btrfsic_state *state,
                struct btrfsic_block *block,
@@ -1204,7 +1284,7 @@ static int btrfsic_create_link_to_next_block(
        if (0 == *num_copiesp) {
                *num_copiesp =
                    btrfs_num_copies(&state->root->fs_info->mapping_tree,
-                                    next_bytenr, PAGE_SIZE);
+                                    next_bytenr, state->metablock_size);
                if (state->print_mask & BTRFSIC_PRINT_MASK_NUM_COPIES)
                        printk(KERN_INFO "num_copies(log_bytenr=%llu) = %d\n",
                               (unsigned long long)next_bytenr, *num_copiesp);
@@ -1219,7 +1299,7 @@ static int btrfsic_create_link_to_next_block(
                       "btrfsic_create_link_to_next_block(mirror_num=%d)\n",
                       *mirror_nump);
        ret = btrfsic_map_block(state, next_bytenr,
-                               BTRFSIC_BLOCK_SIZE,
+                               state->metablock_size,
                                next_block_ctx, *mirror_nump);
        if (ret) {
                printk(KERN_INFO
@@ -1314,7 +1394,7 @@ static int btrfsic_create_link_to_next_block(
 
        if (limit_nesting > 0 && did_alloc_block_link) {
                ret = btrfsic_read_block(state, next_block_ctx);
-               if (ret < (int)BTRFSIC_BLOCK_SIZE) {
+               if (ret < (int)next_block_ctx->len) {
                        printk(KERN_INFO
                               "btrfsic: read block @logical %llu failed!\n",
                               (unsigned long long)next_bytenr);
@@ -1339,43 +1419,55 @@ static int btrfsic_handle_extent_data(
                u32 item_offset, int force_iodone_flag)
 {
        int ret;
-       struct btrfs_file_extent_item *file_extent_item =
-           (struct btrfs_file_extent_item *)(block_ctx->data +
-                                             offsetof(struct btrfs_leaf,
-                                                      items) + item_offset);
-       u64 next_bytenr =
-           le64_to_cpu(file_extent_item->disk_bytenr) +
-           le64_to_cpu(file_extent_item->offset);
-       u64 num_bytes = le64_to_cpu(file_extent_item->num_bytes);
-       u64 generation = le64_to_cpu(file_extent_item->generation);
+       struct btrfs_file_extent_item file_extent_item;
+       u64 file_extent_item_offset;
+       u64 next_bytenr;
+       u64 num_bytes;
+       u64 generation;
        struct btrfsic_block_link *l;
 
+       file_extent_item_offset = offsetof(struct btrfs_leaf, items) +
+                                 item_offset;
+       if (file_extent_item_offset + sizeof(struct btrfs_file_extent_item) >
+           block_ctx->len) {
+               printk(KERN_INFO
+                      "btrfsic: file item out of bounce at logical %llu, dev %s\n",
+                      block_ctx->start, block_ctx->dev->name);
+               return -1;
+       }
+       btrfsic_read_from_block_data(block_ctx, &file_extent_item,
+                                    file_extent_item_offset,
+                                    sizeof(struct btrfs_file_extent_item));
+       next_bytenr = le64_to_cpu(file_extent_item.disk_bytenr) +
+                     le64_to_cpu(file_extent_item.offset);
+       generation = le64_to_cpu(file_extent_item.generation);
+       num_bytes = le64_to_cpu(file_extent_item.num_bytes);
+       generation = le64_to_cpu(file_extent_item.generation);
+
        if (state->print_mask & BTRFSIC_PRINT_MASK_VERY_VERBOSE)
                printk(KERN_INFO "extent_data: type %u, disk_bytenr = %llu,"
                       " offset = %llu, num_bytes = %llu\n",
-                      file_extent_item->type,
-                      (unsigned long long)
-                      le64_to_cpu(file_extent_item->disk_bytenr),
-                      (unsigned long long)
-                      le64_to_cpu(file_extent_item->offset),
+                      file_extent_item.type,
                       (unsigned long long)
-                      le64_to_cpu(file_extent_item->num_bytes));
-       if (BTRFS_FILE_EXTENT_REG != file_extent_item->type ||
-           ((u64)0) == le64_to_cpu(file_extent_item->disk_bytenr))
+                      le64_to_cpu(file_extent_item.disk_bytenr),
+                      (unsigned long long)le64_to_cpu(file_extent_item.offset),
+                      (unsigned long long)num_bytes);
+       if (BTRFS_FILE_EXTENT_REG != file_extent_item.type ||
+           ((u64)0) == le64_to_cpu(file_extent_item.disk_bytenr))
                return 0;
        while (num_bytes > 0) {
                u32 chunk_len;
                int num_copies;
                int mirror_num;
 
-               if (num_bytes > BTRFSIC_BLOCK_SIZE)
-                       chunk_len = BTRFSIC_BLOCK_SIZE;
+               if (num_bytes > state->datablock_size)
+                       chunk_len = state->datablock_size;
                else
                        chunk_len = num_bytes;
 
                num_copies =
                    btrfs_num_copies(&state->root->fs_info->mapping_tree,
-                                    next_bytenr, PAGE_SIZE);
+                                    next_bytenr, state->datablock_size);
                if (state->print_mask & BTRFSIC_PRINT_MASK_NUM_COPIES)
                        printk(KERN_INFO "num_copies(log_bytenr=%llu) = %d\n",
                               (unsigned long long)next_bytenr, num_copies);
@@ -1475,8 +1567,9 @@ static int btrfsic_map_block(struct btrfsic_state *state, u64 bytenr, u32 len,
        block_ctx_out->dev_bytenr = multi->stripes[0].physical;
        block_ctx_out->start = bytenr;
        block_ctx_out->len = len;
-       block_ctx_out->data = NULL;
-       block_ctx_out->bh = NULL;
+       block_ctx_out->datav = NULL;
+       block_ctx_out->pagev = NULL;
+       block_ctx_out->mem_to_free = NULL;
 
        if (0 == ret)
                kfree(multi);
@@ -1496,8 +1589,9 @@ static int btrfsic_map_superblock(struct btrfsic_state *state, u64 bytenr,
        block_ctx_out->dev_bytenr = bytenr;
        block_ctx_out->start = bytenr;
        block_ctx_out->len = len;
-       block_ctx_out->data = NULL;
-       block_ctx_out->bh = NULL;
+       block_ctx_out->datav = NULL;
+       block_ctx_out->pagev = NULL;
+       block_ctx_out->mem_to_free = NULL;
        if (NULL != block_ctx_out->dev) {
                return 0;
        } else {
@@ -1508,38 +1602,127 @@ static int btrfsic_map_superblock(struct btrfsic_state *state, u64 bytenr,
 
 static void btrfsic_release_block_ctx(struct btrfsic_block_data_ctx *block_ctx)
 {
-       if (NULL != block_ctx->bh) {
-               brelse(block_ctx->bh);
-               block_ctx->bh = NULL;
+       if (block_ctx->mem_to_free) {
+               unsigned int num_pages;
+
+               BUG_ON(!block_ctx->datav);
+               BUG_ON(!block_ctx->pagev);
+               num_pages = (block_ctx->len + (u64)PAGE_CACHE_SIZE - 1) >>
+                           PAGE_CACHE_SHIFT;
+               while (num_pages > 0) {
+                       num_pages--;
+                       if (block_ctx->datav[num_pages]) {
+                               kunmap(block_ctx->pagev[num_pages]);
+                               block_ctx->datav[num_pages] = NULL;
+                       }
+                       if (block_ctx->pagev[num_pages]) {
+                               __free_page(block_ctx->pagev[num_pages]);
+                               block_ctx->pagev[num_pages] = NULL;
+                       }
+               }
+
+               kfree(block_ctx->mem_to_free);
+               block_ctx->mem_to_free = NULL;
+               block_ctx->pagev = NULL;
+               block_ctx->datav = NULL;
        }
 }
 
 static int btrfsic_read_block(struct btrfsic_state *state,
                              struct btrfsic_block_data_ctx *block_ctx)
 {
-       block_ctx->bh = NULL;
-       if (block_ctx->dev_bytenr & 4095) {
+       unsigned int num_pages;
+       unsigned int i;
+       u64 dev_bytenr;
+       int ret;
+
+       BUG_ON(block_ctx->datav);
+       BUG_ON(block_ctx->pagev);
+       BUG_ON(block_ctx->mem_to_free);
+       if (block_ctx->dev_bytenr & ((u64)PAGE_CACHE_SIZE - 1)) {
                printk(KERN_INFO
                       "btrfsic: read_block() with unaligned bytenr %llu\n",
                       (unsigned long long)block_ctx->dev_bytenr);
                return -1;
        }
-       if (block_ctx->len > 4096) {
-               printk(KERN_INFO
-                      "btrfsic: read_block() with too huge size %d\n",
-                      block_ctx->len);
+
+       num_pages = (block_ctx->len + (u64)PAGE_CACHE_SIZE - 1) >>
+                   PAGE_CACHE_SHIFT;
+       block_ctx->mem_to_free = kzalloc((sizeof(*block_ctx->datav) +
+                                         sizeof(*block_ctx->pagev)) *
+                                        num_pages, GFP_NOFS);
+       if (!block_ctx->mem_to_free)
                return -1;
+       block_ctx->datav = block_ctx->mem_to_free;
+       block_ctx->pagev = (struct page **)(block_ctx->datav + num_pages);
+       for (i = 0; i < num_pages; i++) {
+               block_ctx->pagev[i] = alloc_page(GFP_NOFS);
+               if (!block_ctx->pagev[i])
+                       return -1;
        }
 
-       block_ctx->bh = __bread(block_ctx->dev->bdev,
-                               block_ctx->dev_bytenr >> 12, 4096);
-       if (NULL == block_ctx->bh)
-               return -1;
-       block_ctx->data = block_ctx->bh->b_data;
+       dev_bytenr = block_ctx->dev_bytenr;
+       for (i = 0; i < num_pages;) {
+               struct bio *bio;
+               unsigned int j;
+               DECLARE_COMPLETION_ONSTACK(complete);
+
+               bio = bio_alloc(GFP_NOFS, num_pages - i);
+               if (!bio) {
+                       printk(KERN_INFO
+                              "btrfsic: bio_alloc() for %u pages failed!\n",
+                              num_pages - i);
+                       return -1;
+               }
+               bio->bi_bdev = block_ctx->dev->bdev;
+               bio->bi_sector = dev_bytenr >> 9;
+               bio->bi_end_io = btrfsic_complete_bio_end_io;
+               bio->bi_private = &complete;
+
+               for (j = i; j < num_pages; j++) {
+                       ret = bio_add_page(bio, block_ctx->pagev[j],
+                                          PAGE_CACHE_SIZE, 0);
+                       if (PAGE_CACHE_SIZE != ret)
+                               break;
+               }
+               if (j == i) {
+                       printk(KERN_INFO
+                              "btrfsic: error, failed to add a single page!\n");
+                       return -1;
+               }
+               submit_bio(READ, bio);
+
+               /* this will also unplug the queue */
+               wait_for_completion(&complete);
+
+               if (!test_bit(BIO_UPTODATE, &bio->bi_flags)) {
+                       printk(KERN_INFO
+                              "btrfsic: read error at logical %llu dev %s!\n",
+                              block_ctx->start, block_ctx->dev->name);
+                       bio_put(bio);
+                       return -1;
+               }
+               bio_put(bio);
+               dev_bytenr += (j - i) * PAGE_CACHE_SIZE;
+               i = j;
+       }
+       for (i = 0; i < num_pages; i++) {
+               block_ctx->datav[i] = kmap(block_ctx->pagev[i]);
+               if (!block_ctx->datav[i]) {
+                       printk(KERN_INFO "btrfsic: kmap() failed (dev %s)!\n",
+                              block_ctx->dev->name);
+                       return -1;
+               }
+       }
 
        return block_ctx->len;
 }
 
+static void btrfsic_complete_bio_end_io(struct bio *bio, int err)
+{
+       complete((struct completion *)bio->bi_private);
+}
+
 static void btrfsic_dump_database(struct btrfsic_state *state)
 {
        struct list_head *elem_all;
@@ -1617,32 +1800,39 @@ static void btrfsic_dump_database(struct btrfsic_state *state)
  * (note that this test fails for the super block)
  */
 static int btrfsic_test_for_metadata(struct btrfsic_state *state,
-                                    const u8 *data, unsigned int size)
+                                    char **datav, unsigned int num_pages)
 {
        struct btrfs_header *h;
        u8 csum[BTRFS_CSUM_SIZE];
        u32 crc = ~(u32)0;
-       int fail = 0;
-       int crc_fail = 0;
+       unsigned int i;
 
-       h = (struct btrfs_header *)data;
+       if (num_pages * PAGE_CACHE_SIZE < state->metablock_size)
+               return 1; /* not metadata */
+       num_pages = state->metablock_size >> PAGE_CACHE_SHIFT;
+       h = (struct btrfs_header *)datav[0];
 
        if (memcmp(h->fsid, state->root->fs_info->fsid, BTRFS_UUID_SIZE))
-               fail++;
+               return 1;
 
-       crc = crc32c(crc, data + BTRFS_CSUM_SIZE, PAGE_SIZE - BTRFS_CSUM_SIZE);
+       for (i = 0; i < num_pages; i++) {
+               u8 *data = i ? datav[i] : (datav[i] + BTRFS_CSUM_SIZE);
+               size_t sublen = i ? PAGE_CACHE_SIZE :
+                                   (PAGE_CACHE_SIZE - BTRFS_CSUM_SIZE);
+
+               crc = crc32c(crc, data, sublen);
+       }
        btrfs_csum_final(crc, csum);
        if (memcmp(csum, h->csum, state->csum_size))
-               crc_fail++;
+               return 1;
 
-       return fail || crc_fail;
+       return 0; /* is metadata */
 }
 
 static void btrfsic_process_written_block(struct btrfsic_dev_state *dev_state,
-                                         u64 dev_bytenr,
-                                         u8 *mapped_data, unsigned int len,
-                                         struct bio *bio,
-                                         int *bio_is_patched,
+                                         u64 dev_bytenr, char **mapped_datav,
+                                         unsigned int num_pages,
+                                         struct bio *bio, int *bio_is_patched,
                                          struct buffer_head *bh,
                                          int submit_bio_bh_rw)
 {
@@ -1652,12 +1842,19 @@ static void btrfsic_process_written_block(struct btrfsic_dev_state *dev_state,
        int ret;
        struct btrfsic_state *state = dev_state->state;
        struct block_device *bdev = dev_state->bdev;
+       unsigned int processed_len;
 
-       WARN_ON(len > PAGE_SIZE);
-       is_metadata = (0 == btrfsic_test_for_metadata(state, mapped_data, len));
        if (NULL != bio_is_patched)
                *bio_is_patched = 0;
 
+again:
+       if (num_pages == 0)
+               return;
+
+       processed_len = 0;
+       is_metadata = (0 == btrfsic_test_for_metadata(state, mapped_datav,
+                                                     num_pages));
+
        block = btrfsic_block_hashtable_lookup(bdev, dev_bytenr,
                                               &state->block_hashtable);
        if (NULL != block) {
@@ -1667,8 +1864,16 @@ static void btrfsic_process_written_block(struct btrfsic_dev_state *dev_state,
 
                if (block->is_superblock) {
                        bytenr = le64_to_cpu(((struct btrfs_super_block *)
-                                             mapped_data)->bytenr);
+                                             mapped_datav[0])->bytenr);
+                       if (num_pages * PAGE_CACHE_SIZE <
+                           BTRFS_SUPER_INFO_SIZE) {
+                               printk(KERN_INFO
+                                      "btrfsic: cannot work with too short bios!\n");
+                               return;
+                       }
                        is_metadata = 1;
+                       BUG_ON(BTRFS_SUPER_INFO_SIZE & (PAGE_CACHE_SIZE - 1));
+                       processed_len = BTRFS_SUPER_INFO_SIZE;
                        if (state->print_mask &
                            BTRFSIC_PRINT_MASK_TREE_BEFORE_SB_WRITE) {
                                printk(KERN_INFO
@@ -1678,12 +1883,18 @@ static void btrfsic_process_written_block(struct btrfsic_dev_state *dev_state,
                }
                if (is_metadata) {
                        if (!block->is_superblock) {
+                               if (num_pages * PAGE_CACHE_SIZE <
+                                   state->metablock_size) {
+                                       printk(KERN_INFO
+                                              "btrfsic: cannot work with too short bios!\n");
+                                       return;
+                               }
+                               processed_len = state->metablock_size;
                                bytenr = le64_to_cpu(((struct btrfs_header *)
-                                                     mapped_data)->bytenr);
+                                                     mapped_datav[0])->bytenr);
                                btrfsic_cmp_log_and_dev_bytenr(state, bytenr,
                                                               dev_state,
-                                                              dev_bytenr,
-                                                              mapped_data);
+                                                              dev_bytenr);
                        }
                        if (block->logical_bytenr != bytenr) {
                                printk(KERN_INFO
@@ -1710,6 +1921,13 @@ static void btrfsic_process_written_block(struct btrfsic_dev_state *dev_state,
                                       block->mirror_num,
                                       btrfsic_get_block_type(state, block));
                } else {
+                       if (num_pages * PAGE_CACHE_SIZE <
+                           state->datablock_size) {
+                               printk(KERN_INFO
+                                      "btrfsic: cannot work with too short bios!\n");
+                               return;
+                       }
+                       processed_len = state->datablock_size;
                        bytenr = block->logical_bytenr;
                        if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
                                printk(KERN_INFO
@@ -1747,7 +1965,7 @@ static void btrfsic_process_written_block(struct btrfsic_dev_state *dev_state,
                               le64_to_cpu(block->disk_key.offset),
                               (unsigned long long)
                               le64_to_cpu(((struct btrfs_header *)
-                                           mapped_data)->generation),
+                                           mapped_datav[0])->generation),
                               (unsigned long long)
                               state->max_superblock_generation);
                        btrfsic_dump_tree(state);
@@ -1765,10 +1983,10 @@ static void btrfsic_process_written_block(struct btrfsic_dev_state *dev_state,
                               (unsigned long long)block->generation,
                               (unsigned long long)
                               le64_to_cpu(((struct btrfs_header *)
-                                           mapped_data)->generation));
+                                           mapped_datav[0])->generation));
                        /* it would not be safe to go on */
                        btrfsic_dump_tree(state);
-                       return;
+                       goto continue_loop;
                }
 
                /*
@@ -1796,18 +2014,19 @@ static void btrfsic_process_written_block(struct btrfsic_dev_state *dev_state,
                }
 
                if (block->is_superblock)
-                       ret = btrfsic_map_superblock(state, bytenr, len,
+                       ret = btrfsic_map_superblock(state, bytenr,
+                                                    processed_len,
                                                     bdev, &block_ctx);
                else
-                       ret = btrfsic_map_block(state, bytenr, len,
+                       ret = btrfsic_map_block(state, bytenr, processed_len,
                                                &block_ctx, 0);
                if (ret) {
                        printk(KERN_INFO
                               "btrfsic: btrfsic_map_block(root @%llu)"
                               " failed!\n", (unsigned long long)bytenr);
-                       return;
+                       goto continue_loop;
                }
-               block_ctx.data = mapped_data;
+               block_ctx.datav = mapped_datav;
                /* the following is required in case of writes to mirrors,
                 * use the same that was used for the lookup */
                block_ctx.dev = dev_state;
@@ -1863,11 +2082,13 @@ static void btrfsic_process_written_block(struct btrfsic_dev_state *dev_state,
                        block->logical_bytenr = bytenr;
                        block->is_metadata = 1;
                        if (block->is_superblock) {
+                               BUG_ON(PAGE_CACHE_SIZE !=
+                                      BTRFS_SUPER_INFO_SIZE);
                                ret = btrfsic_process_written_superblock(
                                                state,
                                                block,
                                                (struct btrfs_super_block *)
-                                               mapped_data);
+                                               mapped_datav[0]);
                                if (state->print_mask &
                                    BTRFSIC_PRINT_MASK_TREE_AFTER_SB_WRITE) {
                                        printk(KERN_INFO
@@ -1880,8 +2101,6 @@ static void btrfsic_process_written_block(struct btrfsic_dev_state *dev_state,
                                                state,
                                                block,
                                                &block_ctx,
-                                               (struct btrfs_header *)
-                                               block_ctx.data,
                                                0, 0);
                        }
                        if (ret)
@@ -1912,26 +2131,30 @@ static void btrfsic_process_written_block(struct btrfsic_dev_state *dev_state,
                u64 bytenr;
 
                if (!is_metadata) {
+                       processed_len = state->datablock_size;
                        if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
                                printk(KERN_INFO "Written block (%s/%llu/?)"
                                       " !found in hash table, D.\n",
                                       dev_state->name,
                                       (unsigned long long)dev_bytenr);
-                       if (!state->include_extent_data)
-                               return; /* ignore that written D block */
+                       if (!state->include_extent_data) {
+                               /* ignore that written D block */
+                               goto continue_loop;
+                       }
 
                        /* this is getting ugly for the
                         * include_extent_data case... */
                        bytenr = 0;     /* unknown */
                        block_ctx.start = bytenr;
-                       block_ctx.len = len;
-                       block_ctx.bh = NULL;
+                       block_ctx.len = processed_len;
+                       block_ctx.mem_to_free = NULL;
+                       block_ctx.pagev = NULL;
                } else {
+                       processed_len = state->metablock_size;
                        bytenr = le64_to_cpu(((struct btrfs_header *)
-                                             mapped_data)->bytenr);
+                                             mapped_datav[0])->bytenr);
                        btrfsic_cmp_log_and_dev_bytenr(state, bytenr, dev_state,
-                                                      dev_bytenr,
-                                                      mapped_data);
+                                                      dev_bytenr);
                        if (state->print_mask & BTRFSIC_PRINT_MASK_VERBOSE)
                                printk(KERN_INFO
                                       "Written block @%llu (%s/%llu/?)"
@@ -1940,17 +2163,17 @@ static void btrfsic_process_written_block(struct btrfsic_dev_state *dev_state,
                                       dev_state->name,
                                       (unsigned long long)dev_bytenr);
 
-                       ret = btrfsic_map_block(state, bytenr, len, &block_ctx,
-                                               0);
+                       ret = btrfsic_map_block(state, bytenr, processed_len,
+                                               &block_ctx, 0);
                        if (ret) {
                                printk(KERN_INFO
                                       "btrfsic: btrfsic_map_block(root @%llu)"
                                       " failed!\n",
                                       (unsigned long long)dev_bytenr);
-                               return;
+                               goto continue_loop;
                        }
                }
-               block_ctx.data = mapped_data;
+               block_ctx.datav = mapped_datav;
                /* the following is required in case of writes to mirrors,
                 * use the same that was used for the lookup */
                block_ctx.dev = dev_state;
@@ -1960,7 +2183,7 @@ static void btrfsic_process_written_block(struct btrfsic_dev_state *dev_state,
                if (NULL == block) {
                        printk(KERN_INFO "btrfsic: error, kmalloc failed!\n");
                        btrfsic_release_block_ctx(&block_ctx);
-                       return;
+                       goto continue_loop;
                }
                block->dev_state = dev_state;
                block->dev_bytenr = dev_bytenr;
@@ -2020,9 +2243,7 @@ static void btrfsic_process_written_block(struct btrfsic_dev_state *dev_state,
 
                if (is_metadata) {
                        ret = btrfsic_process_metablock(state, block,
-                                                       &block_ctx,
-                                                       (struct btrfs_header *)
-                                                       block_ctx.data, 0, 0);
+                                                       &block_ctx, 0, 0);
                        if (ret)
                                printk(KERN_INFO
                                       "btrfsic: process_metablock(root @%llu)"
@@ -2031,6 +2252,13 @@ static void btrfsic_process_written_block(struct btrfsic_dev_state *dev_state,
                }
                btrfsic_release_block_ctx(&block_ctx);
        }
+
+continue_loop:
+       BUG_ON(!processed_len);
+       dev_bytenr += processed_len;
+       mapped_datav += processed_len >> PAGE_CACHE_SHIFT;
+       num_pages -= processed_len >> PAGE_CACHE_SHIFT;
+       goto again;
 }
 
 static void btrfsic_bio_end_io(struct bio *bp, int bio_error_status)
@@ -2213,7 +2441,7 @@ static int btrfsic_process_written_superblock(
 
                num_copies =
                    btrfs_num_copies(&state->root->fs_info->mapping_tree,
-                                    next_bytenr, PAGE_SIZE);
+                                    next_bytenr, BTRFS_SUPER_INFO_SIZE);
                if (state->print_mask & BTRFSIC_PRINT_MASK_NUM_COPIES)
                        printk(KERN_INFO "num_copies(log_bytenr=%llu) = %d\n",
                               (unsigned long long)next_bytenr, num_copies);
@@ -2224,7 +2452,8 @@ static int btrfsic_process_written_superblock(
                                printk(KERN_INFO
                                       "btrfsic_process_written_superblock("
                                       "mirror_num=%d)\n", mirror_num);
-                       ret = btrfsic_map_block(state, next_bytenr, PAGE_SIZE,
+                       ret = btrfsic_map_block(state, next_bytenr,
+                                               BTRFS_SUPER_INFO_SIZE,
                                                &tmp_next_block_ctx,
                                                mirror_num);
                        if (ret) {
@@ -2689,7 +2918,7 @@ static struct btrfsic_block *btrfsic_block_lookup_or_add(
 static void btrfsic_cmp_log_and_dev_bytenr(struct btrfsic_state *state,
                                           u64 bytenr,
                                           struct btrfsic_dev_state *dev_state,
-                                          u64 dev_bytenr, char *data)
+                                          u64 dev_bytenr)
 {
        int num_copies;
        int mirror_num;
@@ -2698,10 +2927,10 @@ static void btrfsic_cmp_log_and_dev_bytenr(struct btrfsic_state *state,
        int match = 0;
 
        num_copies = btrfs_num_copies(&state->root->fs_info->mapping_tree,
-                                     bytenr, PAGE_SIZE);
+                                     bytenr, state->metablock_size);
 
        for (mirror_num = 1; mirror_num <= num_copies; mirror_num++) {
-               ret = btrfsic_map_block(state, bytenr, PAGE_SIZE,
+               ret = btrfsic_map_block(state, bytenr, state->metablock_size,
                                        &block_ctx, mirror_num);
                if (ret) {
                        printk(KERN_INFO "btrfsic:"
@@ -2727,7 +2956,8 @@ static void btrfsic_cmp_log_and_dev_bytenr(struct btrfsic_state *state,
                       (unsigned long long)bytenr, dev_state->name,
                       (unsigned long long)dev_bytenr);
                for (mirror_num = 1; mirror_num <= num_copies; mirror_num++) {
-                       ret = btrfsic_map_block(state, bytenr, PAGE_SIZE,
+                       ret = btrfsic_map_block(state, bytenr,
+                                               state->metablock_size,
                                                &block_ctx, mirror_num);
                        if (ret)
                                continue;
@@ -2781,13 +3011,13 @@ int btrfsic_submit_bh(int rw, struct buffer_head *bh)
                               (unsigned long)bh->b_size, bh->b_data,
                               bh->b_bdev);
                btrfsic_process_written_block(dev_state, dev_bytenr,
-                                             bh->b_data, bh->b_size, NULL,
+                                             &bh->b_data, 1, NULL,
                                              NULL, bh, rw);
        } else if (NULL != dev_state && (rw & REQ_FLUSH)) {
                if (dev_state->state->print_mask &
                    BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH)
                        printk(KERN_INFO
-                              "submit_bh(rw=0x%x) FLUSH, bdev=%p)\n",
+                              "submit_bh(rw=0x%x FLUSH, bdev=%p)\n",
                               rw, bh->b_bdev);
                if (!dev_state->dummy_block_for_bio_bh_flush.is_iodone) {
                        if ((dev_state->state->print_mask &
@@ -2836,6 +3066,7 @@ void btrfsic_submit_bio(int rw, struct bio *bio)
                unsigned int i;
                u64 dev_bytenr;
                int bio_is_patched;
+               char **mapped_datav;
 
                dev_bytenr = 512 * bio->bi_sector;
                bio_is_patched = 0;
@@ -2848,35 +3079,46 @@ void btrfsic_submit_bio(int rw, struct bio *bio)
                               (unsigned long long)dev_bytenr,
                               bio->bi_bdev);
 
+               mapped_datav = kmalloc(sizeof(*mapped_datav) * bio->bi_vcnt,
+                                      GFP_NOFS);
+               if (!mapped_datav)
+                       goto leave;
                for (i = 0; i < bio->bi_vcnt; i++) {
-                       u8 *mapped_data;
-
-                       mapped_data = kmap(bio->bi_io_vec[i].bv_page);
+                       BUG_ON(bio->bi_io_vec[i].bv_len != PAGE_CACHE_SIZE);
+                       mapped_datav[i] = kmap(bio->bi_io_vec[i].bv_page);
+                       if (!mapped_datav[i]) {
+                               while (i > 0) {
+                                       i--;
+                                       kunmap(bio->bi_io_vec[i].bv_page);
+                               }
+                               kfree(mapped_datav);
+                               goto leave;
+                       }
                        if ((BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH |
                             BTRFSIC_PRINT_MASK_VERBOSE) ==
                            (dev_state->state->print_mask &
                             (BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH |
                              BTRFSIC_PRINT_MASK_VERBOSE)))
                                printk(KERN_INFO
-                                      "#%u: page=%p, mapped=%p, len=%u,"
-                                      " offset=%u\n",
+                                      "#%u: page=%p, len=%u, offset=%u\n",
                                       i, bio->bi_io_vec[i].bv_page,
-                                      mapped_data,
                                       bio->bi_io_vec[i].bv_len,
                                       bio->bi_io_vec[i].bv_offset);
-                       btrfsic_process_written_block(dev_state, dev_bytenr,
-                                                     mapped_data,
-                                                     bio->bi_io_vec[i].bv_len,
-                                                     bio, &bio_is_patched,
-                                                     NULL, rw);
+               }
+               btrfsic_process_written_block(dev_state, dev_bytenr,
+                                             mapped_datav, bio->bi_vcnt,
+                                             bio, &bio_is_patched,
+                                             NULL, rw);
+               while (i > 0) {
+                       i--;
                        kunmap(bio->bi_io_vec[i].bv_page);
-                       dev_bytenr += bio->bi_io_vec[i].bv_len;
                }
+               kfree(mapped_datav);
        } else if (NULL != dev_state && (rw & REQ_FLUSH)) {
                if (dev_state->state->print_mask &
                    BTRFSIC_PRINT_MASK_SUBMIT_BIO_BH)
                        printk(KERN_INFO
-                              "submit_bio(rw=0x%x) FLUSH, bdev=%p)\n",
+                              "submit_bio(rw=0x%x FLUSH, bdev=%p)\n",
                               rw, bio->bi_bdev);
                if (!dev_state->dummy_block_for_bio_bh_flush.is_iodone) {
                        if ((dev_state->state->print_mask &
@@ -2903,6 +3145,7 @@ void btrfsic_submit_bio(int rw, struct bio *bio)
                        bio->bi_end_io = btrfsic_bio_end_io;
                }
        }
+leave:
        mutex_unlock(&btrfsic_mutex);
 
        submit_bio(rw, bio);
@@ -2917,6 +3160,30 @@ int btrfsic_mount(struct btrfs_root *root,
        struct list_head *dev_head = &fs_devices->devices;
        struct btrfs_device *device;
 
+       if (root->nodesize != root->leafsize) {
+               printk(KERN_INFO
+                      "btrfsic: cannot handle nodesize %d != leafsize %d!\n",
+                      root->nodesize, root->leafsize);
+               return -1;
+       }
+       if (root->nodesize & ((u64)PAGE_CACHE_SIZE - 1)) {
+               printk(KERN_INFO
+                      "btrfsic: cannot handle nodesize %d not being a multiple of PAGE_CACHE_SIZE %ld!\n",
+                      root->nodesize, (unsigned long)PAGE_CACHE_SIZE);
+               return -1;
+       }
+       if (root->leafsize & ((u64)PAGE_CACHE_SIZE - 1)) {
+               printk(KERN_INFO
+                      "btrfsic: cannot handle leafsize %d not being a multiple of PAGE_CACHE_SIZE %ld!\n",
+                      root->leafsize, (unsigned long)PAGE_CACHE_SIZE);
+               return -1;
+       }
+       if (root->sectorsize & ((u64)PAGE_CACHE_SIZE - 1)) {
+               printk(KERN_INFO
+                      "btrfsic: cannot handle sectorsize %d not being a multiple of PAGE_CACHE_SIZE %ld!\n",
+                      root->sectorsize, (unsigned long)PAGE_CACHE_SIZE);
+               return -1;
+       }
        state = kzalloc(sizeof(*state), GFP_NOFS);
        if (NULL == state) {
                printk(KERN_INFO "btrfs check-integrity: kmalloc() failed!\n");
@@ -2933,6 +3200,8 @@ int btrfsic_mount(struct btrfs_root *root,
        state->print_mask = print_mask;
        state->include_extent_data = including_extent_data;
        state->csum_size = 0;
+       state->metablock_size = root->nodesize;
+       state->datablock_size = root->sectorsize;
        INIT_LIST_HEAD(&state->all_blocks_list);
        btrfsic_block_hashtable_init(&state->block_hashtable);
        btrfsic_block_link_hashtable_init(&state->block_link_hashtable);