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Btrfs: don't put removals from push_node_left into tree mod log twice
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Independant of the check (push_items < src_items) tree_mod_log_eb_copy did
log the removal of the old data entries from the source buffer. Therefore,
we must not call tree_mod_log_eb_move if the check evaluates to true, as
that would log the removal twice, finally resulting in (rewinded) buffers
with wrong values for header_nritems.

Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
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Jan Schmidt committed Oct 23, 2012
1 parent f46dbe3 commit 57911b8
Showing 1 changed file with 7 additions and 2 deletions.
9 changes: 7 additions & 2 deletions fs/btrfs/ctree.c
Original file line number Diff line number Diff line change
Expand Up @@ -1225,6 +1225,8 @@ tree_mod_log_rewind(struct btrfs_fs_info *fs_info, struct extent_buffer *eb,
free_extent_buffer(eb);

__tree_mod_log_rewind(eb_rewin, time_seq, tm);
WARN_ON(btrfs_header_nritems(eb_rewin) >
BTRFS_NODEPTRS_PER_BLOCK(fs_info->fs_root));

return eb_rewin;
}
Expand Down Expand Up @@ -1280,6 +1282,7 @@ get_old_root(struct btrfs_root *root, u64 time_seq)
else
WARN_ON(btrfs_header_level(eb) != 0);
extent_buffer_get(eb);
WARN_ON(btrfs_header_nritems(eb) > BTRFS_NODEPTRS_PER_BLOCK(root));

return eb;
}
Expand Down Expand Up @@ -2970,8 +2973,10 @@ static int push_node_left(struct btrfs_trans_handle *trans,
push_items * sizeof(struct btrfs_key_ptr));

if (push_items < src_nritems) {
tree_mod_log_eb_move(root->fs_info, src, 0, push_items,
src_nritems - push_items);
/*
* don't call tree_mod_log_eb_move here, key removal was already
* fully logged by tree_mod_log_eb_copy above.
*/
memmove_extent_buffer(src, btrfs_node_key_ptr_offset(0),
btrfs_node_key_ptr_offset(push_items),
(src_nritems - push_items) *
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