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Write all super blocks during commit

master
Chris Mason 2008-04-10 16:22:00 -04:00 committed by David Woodhouse
parent fd2d0af0bf
commit d1b04c2112
5 changed files with 108 additions and 4 deletions
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41
disk-io.c
View File

@ -195,6 +195,7 @@ int write_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
length = eb->len;
ret = btrfs_map_block(&root->fs_info->mapping_tree, WRITE,
eb->start, &length, &multi, 0);
while(dev_nr < multi->num_stripes) {
BUG_ON(ret);
eb->fd = multi->stripes[dev_nr].dev->fd;
@ -528,10 +529,12 @@ struct btrfs_root *open_ctree_fd(int fp, const char *path, u64 sb_bytenr)
ret = btrfs_open_devices(fs_devices, O_RDWR);
BUG_ON(ret);
ret = btrfs_bootstrap_super_map(&fs_info->mapping_tree, fs_devices);
BUG_ON(ret);
fs_info->sb_buffer = btrfs_find_create_tree_block(tree_root, sb_bytenr,
4096);
BUG_ON(!fs_info->sb_buffer);
fs_info->sb_buffer->fd = fs_devices->lowest_bdev;
fs_info->sb_buffer->fd = fs_devices->latest_bdev;
fs_info->sb_buffer->dev_bytenr = sb_bytenr;
ret = read_extent_from_disk(fs_info->sb_buffer);
BUG_ON(ret);
@ -608,6 +611,40 @@ struct btrfs_root *open_ctree_fd(int fp, const char *path, u64 sb_bytenr)
return root;
}
int write_all_supers(struct btrfs_root *root)
{
struct list_head *cur;
struct list_head *head = &root->fs_info->fs_devices->devices;
struct btrfs_device *dev;
struct extent_buffer *sb;
struct btrfs_dev_item *dev_item;
int ret;
sb = root->fs_info->sb_buffer;
dev_item = (struct btrfs_dev_item *)offsetof(struct btrfs_super_block,
dev_item);
list_for_each(cur, head) {
dev = list_entry(cur, struct btrfs_device, dev_list);
btrfs_set_device_type(sb, dev_item, dev->type);
btrfs_set_device_id(sb, dev_item, dev->devid);
btrfs_set_device_total_bytes(sb, dev_item, dev->total_bytes);
btrfs_set_device_bytes_used(sb, dev_item, dev->bytes_used);
btrfs_set_device_io_align(sb, dev_item, dev->io_align);
btrfs_set_device_io_width(sb, dev_item, dev->io_width);
btrfs_set_device_sector_size(sb, dev_item, dev->sector_size);
write_extent_buffer(sb, dev->uuid,
(unsigned long)btrfs_device_uuid(dev_item),
BTRFS_DEV_UUID_SIZE);
sb->fd = dev->fd;
sb->dev_bytenr = BTRFS_SUPER_INFO_OFFSET;
btrfs_set_header_flag(sb, BTRFS_HEADER_FLAG_WRITTEN);
csum_tree_block(root, sb, 0);
ret = write_extent_to_disk(sb);
BUG_ON(ret);
}
return 0;
}
int write_ctree_super(struct btrfs_trans_handle *trans,
struct btrfs_root *root)
{
@ -627,7 +664,7 @@ int write_ctree_super(struct btrfs_trans_handle *trans,
write_extent_buffer(root->fs_info->sb_buffer,
&root->fs_info->super_copy, 0,
sizeof(root->fs_info->super_copy));
ret = write_tree_block(trans, root, root->fs_info->sb_buffer);
ret = write_all_supers(root);
if (ret)
fprintf(stderr, "failed to write new super block err %d\n", ret);
return ret;

2
disk-io.h
View File

@ -20,6 +20,8 @@
#define __DISKIO__
#define BTRFS_SUPER_INFO_OFFSET (16 * 1024)
#define BTRFS_SUPER_INFO_SIZE 4096
struct btrfs_device;
struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,

3
utils.c
View File

@ -471,6 +471,9 @@ int btrfs_add_to_fsid(struct btrfs_trans_handle *trans,
kfree(buf);
list_add(&device->dev_list, &root->fs_info->fs_devices->devices);
ret = btrfs_bootstrap_super_map(&root->fs_info->mapping_tree,
root->fs_info->fs_devices);
BUG_ON(ret);
return 0;
}

64
volumes.c
View File

@ -862,6 +862,57 @@ struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid)
return __find_device(head, devid);
}
int btrfs_bootstrap_super_map(struct btrfs_mapping_tree *map_tree,
struct btrfs_fs_devices *fs_devices)
{
struct map_lookup *map;
u64 logical = BTRFS_SUPER_INFO_OFFSET;
u64 length = BTRFS_SUPER_INFO_SIZE;
int num_stripes = 0;
int ret;
int i;
struct list_head *cur;
list_for_each(cur, &fs_devices->devices) {
num_stripes++;
}
map = kmalloc(map_lookup_size(num_stripes), GFP_NOFS);
if (!map)
return -ENOMEM;
map->ce.start = logical;
map->ce.size = length;
map->num_stripes = num_stripes;
map->io_width = length;
map->io_align = length;
map->sector_size = length;
map->stripe_len = length;
map->type = BTRFS_BLOCK_GROUP_RAID1;
i = 0;
list_for_each(cur, &fs_devices->devices) {
struct btrfs_device *device = list_entry(cur,
struct btrfs_device,
dev_list);
map->stripes[i].physical = logical;
map->stripes[i].dev = device;
i++;
}
ret = insert_existing_cache_extent(&map_tree->cache_tree, &map->ce);
if (ret == -EEXIST) {
struct cache_extent *old;
struct map_lookup *old_map;
old = find_cache_extent(&map_tree->cache_tree, logical, length);
old_map = container_of(old, struct map_lookup, ce);
remove_cache_extent(&map_tree->cache_tree, old);
kfree(old_map);
ret = insert_existing_cache_extent(&map_tree->cache_tree,
&map->ce);
}
BUG_ON(ret);
return 0;
}
static int read_one_chunk(struct btrfs_root *root, struct btrfs_key *key,
struct extent_buffer *leaf,
struct btrfs_chunk *chunk)
@ -872,12 +923,20 @@ static int read_one_chunk(struct btrfs_root *root, struct btrfs_key *key,
u64 logical;
u64 length;
u64 devid;
u64 super_offset_diff = 0;
int num_stripes;
int ret;
int i;
logical = key->objectid;
length = key->offset;
if (logical < BTRFS_SUPER_INFO_OFFSET + BTRFS_SUPER_INFO_SIZE) {
super_offset_diff = BTRFS_SUPER_INFO_OFFSET +
BTRFS_SUPER_INFO_SIZE - logical;
logical = BTRFS_SUPER_INFO_OFFSET + BTRFS_SUPER_INFO_SIZE;
}
ce = find_first_cache_extent(&map_tree->cache_tree, logical);
/* already mapped? */
@ -891,7 +950,7 @@ static int read_one_chunk(struct btrfs_root *root, struct btrfs_key *key,
return -ENOMEM;
map->ce.start = logical;
map->ce.size = length;
map->ce.size = length - super_offset_diff;
map->num_stripes = num_stripes;
map->io_width = btrfs_chunk_io_width(leaf, chunk);
map->io_align = btrfs_chunk_io_align(leaf, chunk);
@ -901,7 +960,8 @@ static int read_one_chunk(struct btrfs_root *root, struct btrfs_key *key,
for (i = 0; i < num_stripes; i++) {
map->stripes[i].physical =
btrfs_stripe_offset_nr(leaf, chunk, i);
btrfs_stripe_offset_nr(leaf, chunk, i) +
super_offset_diff;
devid = btrfs_stripe_devid_nr(leaf, chunk, i);
map->stripes[i].dev = btrfs_find_device(root, devid);
if (!map->stripes[i].dev) {

2
volumes.h
View File

@ -105,4 +105,6 @@ int btrfs_scan_one_device(int fd, const char *path,
struct btrfs_fs_devices **fs_devices_ret,
u64 *total_devs, u64 super_offset);
int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len);
int btrfs_bootstrap_super_map(struct btrfs_mapping_tree *map_tree,
struct btrfs_fs_devices *fs_devices);
#endif