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btrfs-progs: separate super_copy out of fs_info

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Allocate fs_info::super_copy dynamically of full BTRFS_SUPER_INFO_SIZE
and use it directly for saving superblock to disk.

This fixes incorrect superblock checksum after mkfs.

Signed-off-by: David Sterba <dsterba@suse.cz>
This commit is contained in:
David Sterba 2013-03-06 17:32:51 +01:00
parent fc61b53da8
commit dd21bc16ad
13 changed files with 81 additions and 77 deletions
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4
btrfs-zero-log.c
View file

@ -64,8 +64,8 @@ int main(int ac, char **av)
return 1;
trans = btrfs_start_transaction(root, 1);
btrfs_set_super_log_root(&root->fs_info->super_copy, 0);
btrfs_set_super_log_root_level(&root->fs_info->super_copy, 0);
btrfs_set_super_log_root(root->fs_info->super_copy, 0);
btrfs_set_super_log_root_level(root->fs_info->super_copy, 0);
btrfs_commit_transaction(trans, root);
close_ctree(root);
return ret;

4
btrfstune.c
View file

@ -40,7 +40,7 @@ int update_seeding_flag(struct btrfs_root *root, int set_flag)
struct btrfs_super_block *disk_super;
u64 super_flags;
disk_super = &root->fs_info->super_copy;
disk_super = root->fs_info->super_copy;
super_flags = btrfs_super_flags(disk_super);
if (set_flag) {
if (super_flags & BTRFS_SUPER_FLAG_SEEDING) {
@ -71,7 +71,7 @@ int enable_extrefs_flag(struct btrfs_root *root)
struct btrfs_super_block *disk_super;
u64 super_flags;
disk_super = &root->fs_info->super_copy;
disk_super = root->fs_info->super_copy;
super_flags = btrfs_super_incompat_flags(disk_super);
super_flags |= BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF;
trans = btrfs_start_transaction(root, 1);

4
cmds-check.c
View file

@ -973,7 +973,7 @@ static u64 count_csum_range(struct btrfs_root *root, u64 start, u64 len)
size_t size;
u64 found = 0;
u64 csum_end;
u16 csum_size = btrfs_super_csum_size(&root->fs_info->super_copy);
u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
btrfs_init_path(&path);
@ -3613,7 +3613,7 @@ int cmd_check(int argc, char **argv)
if (info == NULL)
return 1;
uuid_unparse(info->super_copy.fsid, uuidbuf);
uuid_unparse(info->super_copy->fsid, uuidbuf);
printf("Checking filesystem on %s\nUUID: %s\n", argv[optind], uuidbuf);
if (!extent_buffer_uptodate(info->tree_root->node) ||

16
convert.c
View file

@ -1261,7 +1261,7 @@ static int create_ext2_image(struct btrfs_root *root, ext2_filsys ext2_fs,
u64 total_bytes;
u32 sectorsize = root->sectorsize;
total_bytes = btrfs_super_total_bytes(&fs_info->super_copy);
total_bytes = btrfs_super_total_bytes(fs_info->super_copy);
first_free = BTRFS_SUPER_INFO_OFFSET + sectorsize * 2 - 1;
first_free &= ~((u64)sectorsize - 1);
@ -1527,7 +1527,7 @@ static int create_chunk_mapping(struct btrfs_trans_handle *trans,
btrfs_init_path(&path);
total_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy);
total_bytes = btrfs_super_total_bytes(root->fs_info->super_copy);
chunk_objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
BUG_ON(list_empty(&info->fs_devices->devices));
@ -1691,13 +1691,13 @@ static int init_btrfs(struct btrfs_root *root)
memcpy(&location, &root->root_key, sizeof(location));
location.offset = (u64)-1;
ret = btrfs_insert_dir_item(trans, fs_info->tree_root, "default", 7,
btrfs_super_root_dir(&fs_info->super_copy),
btrfs_super_root_dir(fs_info->super_copy),
&location, BTRFS_FT_DIR, 0);
if (ret)
goto err;
ret = btrfs_insert_inode_ref(trans, fs_info->tree_root, "default", 7,
location.objectid,
btrfs_super_root_dir(&fs_info->super_copy), 0);
btrfs_super_root_dir(fs_info->super_copy), 0);
if (ret)
goto err;
btrfs_set_root_dirid(&fs_info->fs_root->root_item,
@ -2227,7 +2227,7 @@ static int fixup_chunk_mapping(struct btrfs_root *root)
btrfs_release_path(chunk_root, &path);
/* fixup the system chunk array in super block */
btrfs_set_super_sys_array_size(&info->super_copy, 0);
btrfs_set_super_sys_array_size(info->super_copy, 0);
key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
key.offset = 0;
@ -2425,11 +2425,11 @@ static int may_rollback(struct btrfs_root *root)
int num_stripes;
int ret;
if (btrfs_super_num_devices(&info->super_copy) != 1)
if (btrfs_super_num_devices(info->super_copy) != 1)
goto fail;
bytenr = BTRFS_SUPER_INFO_OFFSET;
total_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy);
total_bytes = btrfs_super_total_bytes(root->fs_info->super_copy);
while (1) {
ret = btrfs_map_block(&info->mapping_tree, WRITE, bytenr,
@ -2659,7 +2659,7 @@ next_extent:
goto fail;
}
/* create a system chunk that maps the whole device */
ret = prepare_system_chunk_sb(&root->fs_info->super_copy);
ret = prepare_system_chunk_sb(root->fs_info->super_copy);
if (ret) {
fprintf(stderr, "unable to update system chunk\n");
goto fail;

2
ctree.h
View file

@ -923,7 +923,7 @@ struct btrfs_fs_info {
u64 alloc_start;
struct btrfs_trans_handle *running_transaction;
struct btrfs_super_block super_copy;
struct btrfs_super_block *super_copy;
struct mutex fs_mutex;
u64 super_bytenr;

8
debug-tree.c
View file

@ -372,14 +372,14 @@ no_node:
return 0;
if (root_backups)
print_old_roots(&info->super_copy);
print_old_roots(info->super_copy);
printf("total bytes %llu\n",
(unsigned long long)btrfs_super_total_bytes(&info->super_copy));
(unsigned long long)btrfs_super_total_bytes(info->super_copy));
printf("bytes used %llu\n",
(unsigned long long)btrfs_super_bytes_used(&info->super_copy));
(unsigned long long)btrfs_super_bytes_used(info->super_copy));
uuidbuf[36] = '\0';
uuid_unparse(info->super_copy.fsid, uuidbuf);
uuid_unparse(info->super_copy->fsid, uuidbuf);
printf("uuid %s\n", uuidbuf);
printf("%s\n", BTRFS_BUILD_VERSION);
return 0;

46
disk-io.c
View file

@ -106,7 +106,7 @@ int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
int verify)
{
u16 csum_size =
btrfs_super_csum_size(&root->fs_info->super_copy);
btrfs_super_csum_size(root->fs_info->super_copy);
return csum_tree_block_size(buf, csum_size, verify);
}
@ -840,6 +840,7 @@ static struct btrfs_fs_info *__open_ctree_fd(int fp, const char *path,
}
memset(fs_info, 0, sizeof(*fs_info));
fs_info->super_copy = calloc(1, BTRFS_SUPER_INFO_SIZE);
fs_info->tree_root = tree_root;
fs_info->extent_root = extent_root;
fs_info->chunk_root = chunk_root;
@ -875,7 +876,7 @@ static struct btrfs_fs_info *__open_ctree_fd(int fp, const char *path,
goto out_cleanup;
fs_info->super_bytenr = sb_bytenr;
disk_super = &fs_info->super_copy;
disk_super = fs_info->super_copy;
ret = btrfs_read_dev_super(fs_devices->latest_bdev,
disk_super, sb_bytenr);
if (ret) {
@ -1164,10 +1165,6 @@ int write_dev_supers(struct btrfs_root *root, struct btrfs_super_block *sb,
u64 bytenr;
u32 crc;
int i, ret;
void *buf;
buf = calloc(1, BTRFS_SUPER_INFO_SIZE);
BUG_ON(!buf);
if (root->fs_info->super_bytenr != BTRFS_SUPER_INFO_OFFSET) {
btrfs_set_super_bytenr(sb, root->fs_info->super_bytenr);
@ -1176,11 +1173,15 @@ int write_dev_supers(struct btrfs_root *root, struct btrfs_super_block *sb,
BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
btrfs_csum_final(crc, (char *)&sb->csum[0]);
memcpy(buf, sb, sizeof(*sb));
ret = pwrite64(device->fd, buf, BTRFS_SUPER_INFO_SIZE,
root->fs_info->super_bytenr);
/*
* super_copy is BTRFS_SUPER_INFO_SIZE bytes and is
* zero filled, we can use it directly
*/
ret = pwrite64(device->fd, root->fs_info->super_copy,
BTRFS_SUPER_INFO_SIZE,
root->fs_info->super_bytenr);
BUG_ON(ret != BTRFS_SUPER_INFO_SIZE);
goto out;
return 0;
}
for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
@ -1195,12 +1196,15 @@ int write_dev_supers(struct btrfs_root *root, struct btrfs_super_block *sb,
BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
btrfs_csum_final(crc, (char *)&sb->csum[0]);
memcpy(buf, sb, sizeof(*sb));
ret = pwrite64(device->fd, buf, BTRFS_SUPER_INFO_SIZE, bytenr);
/*
* super_copy is BTRFS_SUPER_INFO_SIZE bytes and is
* zero filled, we can use it directly
*/
ret = pwrite64(device->fd, root->fs_info->super_copy,
BTRFS_SUPER_INFO_SIZE, bytenr);
BUG_ON(ret != BTRFS_SUPER_INFO_SIZE);
}
out:
free(buf);
return 0;
}
@ -1214,7 +1218,7 @@ int write_all_supers(struct btrfs_root *root)
int ret;
u64 flags;
sb = &root->fs_info->super_copy;
sb = root->fs_info->super_copy;
dev_item = &sb->dev_item;
list_for_each(cur, head) {
dev = list_entry(cur, struct btrfs_device, dev_list);
@ -1251,17 +1255,17 @@ int write_ctree_super(struct btrfs_trans_handle *trans,
if (root->fs_info->readonly)
return 0;
btrfs_set_super_generation(&root->fs_info->super_copy,
btrfs_set_super_generation(root->fs_info->super_copy,
trans->transid);
btrfs_set_super_root(&root->fs_info->super_copy,
btrfs_set_super_root(root->fs_info->super_copy,
tree_root->node->start);
btrfs_set_super_root_level(&root->fs_info->super_copy,
btrfs_set_super_root_level(root->fs_info->super_copy,
btrfs_header_level(tree_root->node));
btrfs_set_super_chunk_root(&root->fs_info->super_copy,
btrfs_set_super_chunk_root(root->fs_info->super_copy,
chunk_root->node->start);
btrfs_set_super_chunk_root_level(&root->fs_info->super_copy,
btrfs_set_super_chunk_root_level(root->fs_info->super_copy,
btrfs_header_level(chunk_root->node));
btrfs_set_super_chunk_root_generation(&root->fs_info->super_copy,
btrfs_set_super_chunk_root_generation(root->fs_info->super_copy,
btrfs_header_generation(chunk_root->node));
ret = write_all_supers(root);

8
extent-tree.c
View file

@ -1830,12 +1830,12 @@ static int update_block_group(struct btrfs_trans_handle *trans,
u64 end;
/* block accounting for super block */
old_val = btrfs_super_bytes_used(&info->super_copy);
old_val = btrfs_super_bytes_used(info->super_copy);
if (alloc)
old_val += num_bytes;
else
old_val -= num_bytes;
btrfs_set_super_bytes_used(&info->super_copy, old_val);
btrfs_set_super_bytes_used(info->super_copy, old_val);
/* block accounting for root item */
old_val = btrfs_root_used(&root->root_item);
@ -3216,7 +3216,7 @@ int btrfs_make_block_groups(struct btrfs_trans_handle *trans,
extent_root = root->fs_info->extent_root;
block_group_cache = &root->fs_info->block_group_cache;
chunk_objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
total_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy);
total_bytes = btrfs_super_total_bytes(root->fs_info->super_copy);
group_align = 64 * root->sectorsize;
cur_start = 0;
@ -3451,7 +3451,7 @@ int btrfs_fix_block_accounting(struct btrfs_trans_handle *trans,
}
path.slots[0]++;
}
btrfs_set_super_bytes_used(&root->fs_info->super_copy, bytes_used);
btrfs_set_super_bytes_used(root->fs_info->super_copy, bytes_used);
btrfs_release_path(root, &path);
return 0;
}

8
file-item.c
View file

@ -134,7 +134,7 @@ struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
struct extent_buffer *leaf;
u64 csum_offset = 0;
u16 csum_size =
btrfs_super_csum_size(&root->fs_info->super_copy);
btrfs_super_csum_size(root->fs_info->super_copy);
int csums_in_item;
file_key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
@ -206,7 +206,7 @@ int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
u32 nritems;
u32 ins_size;
u16 csum_size =
btrfs_super_csum_size(&root->fs_info->super_copy);
btrfs_super_csum_size(root->fs_info->super_copy);
path = btrfs_alloc_path();
BUG_ON(!path);
@ -352,7 +352,7 @@ static noinline int truncate_one_csum(struct btrfs_trans_handle *trans,
{
struct extent_buffer *leaf;
u16 csum_size =
btrfs_super_csum_size(&root->fs_info->super_copy);
btrfs_super_csum_size(root->fs_info->super_copy);
u64 csum_end;
u64 end_byte = bytenr + len;
u32 blocksize = root->sectorsize;
@ -411,7 +411,7 @@ int btrfs_del_csums(struct btrfs_trans_handle *trans,
struct extent_buffer *leaf;
int ret;
u16 csum_size =
btrfs_super_csum_size(&root->fs_info->super_copy);
btrfs_super_csum_size(root->fs_info->super_copy);
int blocksize = root->sectorsize;
root = root->fs_info->csum_root;

16
find-root.c
View file

@ -147,7 +147,7 @@ static struct btrfs_root *open_ctree_broken(int fd, const char *device)
goto out_cleanup;
fs_info->super_bytenr = BTRFS_SUPER_INFO_OFFSET;
disk_super = &fs_info->super_copy;
disk_super = fs_info->super_copy;
ret = btrfs_read_dev_super(fs_devices->latest_bdev,
disk_super, BTRFS_SUPER_INFO_OFFSET);
if (ret) {
@ -234,10 +234,10 @@ out:
static int search_iobuf(struct btrfs_root *root, void *iobuf,
size_t iobuf_size, off_t offset)
{
u64 gen = btrfs_super_generation(&root->fs_info->super_copy);
u64 gen = btrfs_super_generation(root->fs_info->super_copy);
u64 objectid = search_objectid;
u32 size = btrfs_super_nodesize(&root->fs_info->super_copy);
u8 level = root->fs_info->super_copy.root_level;
u32 size = btrfs_super_nodesize(root->fs_info->super_copy);
u8 level = root->fs_info->super_copy->root_level;
size_t block_off = 0;
while (block_off < iobuf_size) {
@ -322,8 +322,8 @@ static int find_root(struct btrfs_root *root)
int ret = 1;
printf("Super think's the tree root is at %Lu, chunk root %Lu\n",
btrfs_super_root(&root->fs_info->super_copy),
btrfs_super_chunk_root(&root->fs_info->super_copy));
btrfs_super_root(root->fs_info->super_copy),
btrfs_super_chunk_root(root->fs_info->super_copy));
err = btrfs_next_metadata(&root->fs_info->mapping_tree,
&metadata_offset, &metadata_size);
@ -336,7 +336,7 @@ static int find_root(struct btrfs_root *root)
u64 type;
if (offset >
btrfs_super_total_bytes(&root->fs_info->super_copy)) {
btrfs_super_total_bytes(root->fs_info->super_copy)) {
printf("Went past the fs size, exiting");
break;
}
@ -426,7 +426,7 @@ int main(int argc, char **argv)
exit(1);
}
csum_size = btrfs_super_csum_size(&root->fs_info->super_copy);
csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
ret = find_root(root);
close_ctree(root);
return ret;

12
mkfs.c
View file

@ -67,7 +67,7 @@ static int make_root_dir(struct btrfs_root *root, int mixed)
int ret;
trans = btrfs_start_transaction(root, 1);
bytes_used = btrfs_super_bytes_used(&root->fs_info->super_copy);
bytes_used = btrfs_super_bytes_used(root->fs_info->super_copy);
root->fs_info->system_allocs = 1;
ret = btrfs_make_block_group(trans, root, bytes_used,
@ -129,7 +129,7 @@ static int make_root_dir(struct btrfs_root *root, int mixed)
location.offset = (u64)-1;
ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
"default", 7,
btrfs_super_root_dir(&root->fs_info->super_copy),
btrfs_super_root_dir(root->fs_info->super_copy),
&location, BTRFS_FT_DIR, 0);
if (ret)
goto err;
@ -208,7 +208,7 @@ static int create_raid_groups(struct btrfs_trans_handle *trans,
int data_profile_opt, u64 metadata_profile,
int metadata_profile_opt, int mixed, int ssd)
{
u64 num_devices = btrfs_super_num_devices(&root->fs_info->super_copy);
u64 num_devices = btrfs_super_num_devices(root->fs_info->super_copy);
u64 allowed = 0;
u64 devices_for_raid = num_devices;
int ret;
@ -1650,7 +1650,7 @@ raid_groups:
ret = create_data_reloc_tree(trans, root);
BUG_ON(ret);
super = &root->fs_info->super_copy;
super = root->fs_info->super_copy;
flags = btrfs_super_incompat_flags(super);
flags |= BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF;
@ -1661,7 +1661,7 @@ raid_groups:
if ((data_profile | metadata_profile) &
(BTRFS_BLOCK_GROUP_RAID5 | BTRFS_BLOCK_GROUP_RAID6)) {
struct btrfs_super_block *super = &root->fs_info->super_copy;
struct btrfs_super_block *super = root->fs_info->super_copy;
u64 flags = btrfs_super_incompat_flags(super);
flags |= BTRFS_FEATURE_INCOMPAT_RAID56;
@ -1672,7 +1672,7 @@ raid_groups:
printf("fs created label %s on %s\n\tnodesize %u leafsize %u "
"sectorsize %u size %s\n",
label, first_file, nodesize, leafsize, sectorsize,
pretty_buf = pretty_sizes(btrfs_super_total_bytes(&root->fs_info->super_copy)));
pretty_buf = pretty_sizes(btrfs_super_total_bytes(root->fs_info->super_copy)));
free(pretty_buf);
printf("%s\n", BTRFS_BUILD_VERSION);

10
utils.c
View file

@ -473,7 +473,7 @@ int btrfs_add_to_fsid(struct btrfs_trans_handle *trans,
u32 sectorsize)
{
struct btrfs_super_block *disk_super;
struct btrfs_super_block *super = &root->fs_info->super_copy;
struct btrfs_super_block *super = root->fs_info->super_copy;
struct btrfs_device *device;
struct btrfs_dev_item *dev_item;
char *buf;
@ -624,7 +624,7 @@ int btrfs_make_root_dir(struct btrfs_trans_handle *trans,
btrfs_set_stack_timespec_nsec(&inode_item.otime, 0);
if (root->fs_info->tree_root == root)
btrfs_set_super_root_dir(&root->fs_info->super_copy, objectid);
btrfs_set_super_root_dir(root->fs_info->super_copy, objectid);
ret = btrfs_insert_inode(trans, root, objectid, &inode_item);
if (ret)
@ -1088,7 +1088,7 @@ int btrfs_device_already_in_root(struct btrfs_root *root, int fd,
if (disk_super->magic != cpu_to_le64(BTRFS_MAGIC))
goto brelse;
if (!memcmp(disk_super->fsid, root->fs_info->super_copy.fsid,
if (!memcmp(disk_super->fsid, root->fs_info->super_copy->fsid,
BTRFS_FSID_SIZE))
ret = 1;
brelse:
@ -1191,7 +1191,7 @@ static int set_label_unmounted(const char *dev, const char *label)
return -1;
trans = btrfs_start_transaction(root, 1);
snprintf(root->fs_info->super_copy.label, BTRFS_LABEL_SIZE, "%s",
snprintf(root->fs_info->super_copy->label, BTRFS_LABEL_SIZE, "%s",
label);
btrfs_commit_transaction(trans, root);
@ -1243,7 +1243,7 @@ static int get_label_unmounted(const char *dev)
if(!root)
return -1;
fprintf(stdout, "%s\n", root->fs_info->super_copy.label);
fprintf(stdout, "%s\n", root->fs_info->super_copy->label);
/* Now we close it since we are done. */
close_ctree(root);

20
volumes.c
View file

@ -604,7 +604,7 @@ int btrfs_add_system_chunk(struct btrfs_trans_handle *trans,
struct btrfs_key *key,
struct btrfs_chunk *chunk, int item_size)
{
struct btrfs_super_block *super_copy = &root->fs_info->super_copy;
struct btrfs_super_block *super_copy = root->fs_info->super_copy;
struct btrfs_disk_key disk_key;
u32 array_size;
u8 *ptr;
@ -708,7 +708,7 @@ int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
}
if (type & BTRFS_BLOCK_GROUP_RAID1) {
num_stripes = min_t(u64, 2,
btrfs_super_num_devices(&info->super_copy));
btrfs_super_num_devices(info->super_copy));
if (num_stripes < 2)
return -ENOSPC;
min_stripes = 2;
@ -718,11 +718,11 @@ int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
min_stripes = 2;
}
if (type & (BTRFS_BLOCK_GROUP_RAID0)) {
num_stripes = btrfs_super_num_devices(&info->super_copy);
num_stripes = btrfs_super_num_devices(info->super_copy);
min_stripes = 2;
}
if (type & (BTRFS_BLOCK_GROUP_RAID10)) {
num_stripes = btrfs_super_num_devices(&info->super_copy);
num_stripes = btrfs_super_num_devices(info->super_copy);
if (num_stripes < 4)
return -ENOSPC;
num_stripes &= ~(u32)1;
@ -730,24 +730,24 @@ int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
min_stripes = 4;
}
if (type & (BTRFS_BLOCK_GROUP_RAID5)) {
num_stripes = btrfs_super_num_devices(&info->super_copy);
num_stripes = btrfs_super_num_devices(info->super_copy);
if (num_stripes < 2)
return -ENOSPC;
min_stripes = 2;
stripe_len = find_raid56_stripe_len(num_stripes - 1,
btrfs_super_stripesize(&info->super_copy));
btrfs_super_stripesize(info->super_copy));
}
if (type & (BTRFS_BLOCK_GROUP_RAID6)) {
num_stripes = btrfs_super_num_devices(&info->super_copy);
num_stripes = btrfs_super_num_devices(info->super_copy);
if (num_stripes < 3)
return -ENOSPC;
min_stripes = 3;
stripe_len = find_raid56_stripe_len(num_stripes - 2,
btrfs_super_stripesize(&info->super_copy));
btrfs_super_stripesize(info->super_copy));
}
/* we don't want a chunk larger than 10% of the FS */
percent_max = div_factor(btrfs_super_total_bytes(&info->super_copy), 1);
percent_max = div_factor(btrfs_super_total_bytes(info->super_copy), 1);
max_chunk_size = min(percent_max, max_chunk_size);
again:
@ -1652,7 +1652,7 @@ int btrfs_read_super_device(struct btrfs_root *root, struct extent_buffer *buf)
int btrfs_read_sys_array(struct btrfs_root *root)
{
struct btrfs_super_block *super_copy = &root->fs_info->super_copy;
struct btrfs_super_block *super_copy = root->fs_info->super_copy;
struct extent_buffer *sb;
struct btrfs_disk_key *disk_key;
struct btrfs_chunk *chunk;