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Btrfs: Add support for online device removal

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This required a few structural changes to the code that manages bdev pointers:

The VFS super block now gets an anon-bdev instead of a pointer to the
lowest bdev.  This allows us to avoid swapping the super block bdev pointer
around at run time.

The code to read in the super block no longer goes through the extent
buffer interface.  Things got ugly keeping the mapping constant.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2008-05-07 11:43:44 -04:00
parent 5d9cd9ecbf
commit a061fc8da7
8 changed files with 410 additions and 120 deletions
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5
fs/btrfs/transaction.c
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@@ -738,9 +738,8 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
chunk_root->node->start);
btrfs_set_super_chunk_root_level(&root->fs_info->super_copy,
btrfs_header_level(chunk_root->node));
write_extent_buffer(root->fs_info->sb_buffer,
&root->fs_info->super_copy, 0,
sizeof(root->fs_info->super_copy));
memcpy(&root->fs_info->super_for_commit, &root->fs_info->super_copy,
sizeof(root->fs_info->super_copy));
btrfs_copy_pinned(root, pinned_copy);