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Btrfs: Fix balance_level to free the middle block if there is room in the left one 

balance level starts by trying to empty the middle block, and then
pushes from the right to the middle.  This might empty the right block
and leave a small number of pointers in the middle.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2008-04-24 14:42:46 -04:00
parent 971a1f6648
commit bce4eae986
2 changed files with 30 additions and 9 deletions
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35
fs/btrfs/ctree.c
View File

@ -789,7 +789,7 @@ static int balance_level(struct btrfs_trans_handle *trans,
/* first, try to make some room in the middle buffer */ /* first, try to make some room in the middle buffer */
if (left) { if (left) {
orig_slot += btrfs_header_nritems(left); orig_slot += btrfs_header_nritems(left);
wret = push_node_left(trans, root, left, mid, 0); wret = push_node_left(trans, root, left, mid, 1);
if (wret < 0) if (wret < 0)
ret = wret; ret = wret;
if (btrfs_header_nritems(mid) < 2) if (btrfs_header_nritems(mid) < 2)
@ -844,6 +844,11 @@ static int balance_level(struct btrfs_trans_handle *trans,
ret = wret; ret = wret;
goto enospc; goto enospc;
} }
if (wret == 1) {
wret = push_node_left(trans, root, left, mid, 1);
if (wret < 0)
ret = wret;
}
BUG_ON(wret == 1); BUG_ON(wret == 1);
} }
if (btrfs_header_nritems(mid) == 0) { if (btrfs_header_nritems(mid) == 0) {
@ -1252,17 +1257,27 @@ static int push_node_left(struct btrfs_trans_handle *trans,
WARN_ON(btrfs_header_generation(src) != trans->transid); WARN_ON(btrfs_header_generation(src) != trans->transid);
WARN_ON(btrfs_header_generation(dst) != trans->transid); WARN_ON(btrfs_header_generation(dst) != trans->transid);
if (!empty && src_nritems <= 2) if (!empty && src_nritems <= 8)
return 1; return 1;
if (push_items <= 0) { if (push_items <= 0) {
return 1; return 1;
} }
if (empty) if (empty) {
push_items = min(src_nritems, push_items); push_items = min(src_nritems, push_items);
else if (push_items < src_nritems) {
push_items = min(src_nritems - 2, push_items); /* leave at least 8 pointers in the node if
* we aren't going to empty it
*/
if (src_nritems - push_items < 8) {
if (push_items <= 8)
return 1;
push_items -= 8;
}
}
} else
push_items = min(src_nritems - 8, push_items);
copy_extent_buffer(dst, src, copy_extent_buffer(dst, src,
btrfs_node_key_ptr_offset(dst_nritems), btrfs_node_key_ptr_offset(dst_nritems),
@ -1308,13 +1323,19 @@ static int balance_node_right(struct btrfs_trans_handle *trans,
src_nritems = btrfs_header_nritems(src); src_nritems = btrfs_header_nritems(src);
dst_nritems = btrfs_header_nritems(dst); dst_nritems = btrfs_header_nritems(dst);
push_items = BTRFS_NODEPTRS_PER_BLOCK(root) - dst_nritems; push_items = BTRFS_NODEPTRS_PER_BLOCK(root) - dst_nritems;
if (push_items <= 0) if (push_items <= 0) {
return 1; return 1;
}
if (src_nritems < 4) {
return 1;
}
max_push = src_nritems / 2 + 1; max_push = src_nritems / 2 + 1;
/* don't try to empty the node */ /* don't try to empty the node */
if (max_push >= src_nritems) if (max_push >= src_nritems) {
return 1; return 1;
}
if (max_push < push_items) if (max_push < push_items)
push_items = max_push; push_items = max_push;

4
fs/btrfs/extent-tree.c
View File

@ -306,13 +306,13 @@ struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
int bit; int bit;
int ret; int ret;
int full_search = 0; int full_search = 0;
int factor = 8; int factor = 10;
block_group_cache = &info->block_group_cache; block_group_cache = &info->block_group_cache;
total_fs_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy); total_fs_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy);
if (!owner) if (!owner)
factor = 8; factor = 10;
bit = block_group_state_bits(data); bit = block_group_state_bits(data);