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Btrfs: Fix super block updates during transaction commit

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The super block written during commit was not consistent with the state of
the trees.  This change adds an in-memory copy of the super so that we can
make sure to write out consistent data during a commit.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2007-06-26 10:06:50 -04:00
committed by David Woodhouse
parent 79c44584ea
commit 4b52dff6d3
5 changed files with 18 additions and 14 deletions
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16
fs/btrfs/extent-tree.c
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@@ -796,8 +796,8 @@ static int finish_current_insert(struct btrfs_trans_handle *trans, struct
for (i = 0; i < extent_root->fs_info->extent_tree_insert_nr; i++) {
ins.objectid = extent_root->fs_info->extent_tree_insert[i];
super_blocks_used = btrfs_super_blocks_used(info->disk_super);
btrfs_set_super_blocks_used(info->disk_super,
super_blocks_used = btrfs_super_blocks_used(&info->super_copy);
btrfs_set_super_blocks_used(&info->super_copy,
super_blocks_used + 1);
ret = btrfs_insert_item(trans, extent_root, &ins, &extent_item,
sizeof(extent_item));
@@ -892,8 +892,8 @@ static int __free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
BUG_ON(ret);
}
super_blocks_used = btrfs_super_blocks_used(info->disk_super);
btrfs_set_super_blocks_used(info->disk_super,
super_blocks_used = btrfs_super_blocks_used(&info->super_copy);
btrfs_set_super_blocks_used(&info->super_copy,
super_blocks_used - num_blocks);
ret = btrfs_del_item(trans, extent_root, path);
if (ret) {
@@ -1032,7 +1032,7 @@ static int find_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
info->extent_tree_prealloc_nr = 0;
}
if (search_end == (u64)-1)
search_end = btrfs_super_total_blocks(info->disk_super);
search_end = btrfs_super_total_blocks(&info->super_copy);
if (hint_block) {
block_group = btrfs_lookup_block_group(info, hint_block);
block_group = btrfs_find_block_group(root, block_group,
@@ -1361,8 +1361,8 @@ int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
}
}
super_blocks_used = btrfs_super_blocks_used(info->disk_super);
btrfs_set_super_blocks_used(info->disk_super, super_blocks_used +
super_blocks_used = btrfs_super_blocks_used(&info->super_copy);
btrfs_set_super_blocks_used(&info->super_copy, super_blocks_used +
num_blocks);
ret = btrfs_insert_item(trans, extent_root, ins, &extent_item,
sizeof(extent_item));
@@ -1737,7 +1737,7 @@ int btrfs_read_block_groups(struct btrfs_root *root)
BTRFS_BLOCK_GROUP_AVAIL);
}
if (key.objectid >=
btrfs_super_total_blocks(info->disk_super))
btrfs_super_total_blocks(&info->super_copy))
break;
}