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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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5
fs/btrfs/disk-io.c
View file

@ -471,6 +471,8 @@ struct btrfs_root *open_ctree(struct super_block *sb)
if (!fs_info->sb_buffer)
goto fail_iput;
disk_super = (struct btrfs_super_block *)fs_info->sb_buffer->b_data;
fs_info->disk_super = disk_super;
memcpy(&fs_info->super_copy, disk_super, sizeof(fs_info->super_copy));
if (!btrfs_super_root(disk_super))
goto fail_sb_buffer;
@ -479,7 +481,6 @@ struct btrfs_root *open_ctree(struct super_block *sb)
btrfs_super_total_blocks(disk_super) <<
fs_info->btree_inode->i_blkbits);
fs_info->disk_super = disk_super;
if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC,
sizeof(disk_super->magic))) {
@ -527,8 +528,6 @@ int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root
int ret;
struct buffer_head *bh = root->fs_info->sb_buffer;
btrfs_set_super_root(root->fs_info->disk_super,
bh_blocknr(root->fs_info->tree_root->node));
lock_buffer(bh);
WARN_ON(atomic_read(&bh->b_count) < 1);
clear_buffer_dirty(bh);