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Btrfs: Find and remove dead roots the first time a root is loaded.

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Dead roots are trees left over after a crash, and they were either in the
process of being removed or were waiting to be removed when the box crashed.
Before, a search of the entire tree of root pointers was done on mount
looking for dead roots.  Now, the search is done the first time we load
a root.

This makes mount faster when there are a large number of snapshots, and it
enables the block accounting code to properly update the block counts on
the latest root as old versions of the root are reaped after a crash.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2007-09-11 11:15:39 -04:00
committed by David Woodhouse
parent 0e2752a72c
commit 5ce14bbcdd
5 changed files with 25 additions and 12 deletions
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6
fs/btrfs/transaction.c
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@@ -239,7 +239,9 @@ struct dirty_root {
struct btrfs_root *latest_root;
};
int btrfs_add_dead_root(struct btrfs_root *root, struct list_head *dead_list)
int btrfs_add_dead_root(struct btrfs_root *root,
struct btrfs_root *latest,
struct list_head *dead_list)
{
struct dirty_root *dirty;
@@ -247,6 +249,7 @@ int btrfs_add_dead_root(struct btrfs_root *root, struct list_head *dead_list)
if (!dirty)
return -ENOMEM;
dirty->root = root;
dirty->latest_root = latest;
list_add(&dirty->list, dead_list);
return 0;
}
@@ -412,7 +415,6 @@ static int drop_dirty_roots(struct btrfs_root *tree_root,
while(1) {
trans = btrfs_start_transaction(tree_root, 1);
ret = btrfs_drop_snapshot(trans, dirty->root);
if (ret != -EAGAIN) {
break;