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Btrfs: change how we track dirty roots 

I've been overloading root->dirty_list to keep track of dirty roots and which
roots need to have their commit roots switched at transaction commit time.  This
could cause us to lose an update to the root which could corrupt the file
system.  To fix this use a state bit to know if the root is dirty, and if it
isn't set we go ahead and move the root to the dirty list.  This way if we
re-dirty the root after adding it to the switch_commit list we make sure to
update it.  This also makes it so that the extent root is always the last root
on the dirty list to try and keep the amount of churn down at this point in the
commit.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Josef Bacik 2014-12-16 08:54:43 -08:00 committed by Chris Mason
parent ec6f34e5b5
commit e7070be198
3 changed files with 21 additions and 5 deletions
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16
fs/btrfs/ctree.c
View File

@ -213,11 +213,19 @@ static struct extent_buffer *btrfs_read_lock_root_node(struct btrfs_root *root)
*/
static void add_root_to_dirty_list(struct btrfs_root *root)
{
if (test_bit(BTRFS_ROOT_DIRTY, &root->state) ||
!test_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state))
return;
spin_lock(&root->fs_info->trans_lock);
if (test_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state) &&
list_empty(&root->dirty_list)) {
list_add(&root->dirty_list,
&root->fs_info->dirty_cowonly_roots);
if (!test_and_set_bit(BTRFS_ROOT_DIRTY, &root->state)) {
/* Want the extent tree to be the last on the list */
if (root->objectid == BTRFS_EXTENT_TREE_OBJECTID)
list_move_tail(&root->dirty_list,
&root->fs_info->dirty_cowonly_roots);
else
list_move(&root->dirty_list,
&root->fs_info->dirty_cowonly_roots);
}
spin_unlock(&root->fs_info->trans_lock);
}

1
fs/btrfs/ctree.h
View File

@ -1775,6 +1775,7 @@ struct btrfs_subvolume_writers {
#define BTRFS_ROOT_DEFRAG_RUNNING 6
#define BTRFS_ROOT_FORCE_COW 7
#define BTRFS_ROOT_MULTI_LOG_TASKS 8
#define BTRFS_ROOT_DIRTY 9
/*
* in ram representation of the tree. extent_root is used for all allocations

9
fs/btrfs/transaction.c
View File

@ -1020,6 +1020,7 @@ static int update_cowonly_root(struct btrfs_trans_handle *trans,
u64 old_root_bytenr;
u64 old_root_used;
struct btrfs_root *tree_root = root->fs_info->tree_root;
bool extent_root = (root->objectid == BTRFS_EXTENT_TREE_OBJECTID);
old_root_used = btrfs_root_used(&root->root_item);
btrfs_write_dirty_block_groups(trans, root);
@ -1038,7 +1039,12 @@ static int update_cowonly_root(struct btrfs_trans_handle *trans,
return ret;
old_root_used = btrfs_root_used(&root->root_item);
ret = btrfs_write_dirty_block_groups(trans, root);
if (extent_root) {
ret = btrfs_write_dirty_block_groups(trans, root);
if (ret)
return ret;
}
ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1);
if (ret)
return ret;
}
@ -1097,6 +1103,7 @@ static noinline int commit_cowonly_roots(struct btrfs_trans_handle *trans,
next = fs_info->dirty_cowonly_roots.next;
list_del_init(next);
root = list_entry(next, struct btrfs_root, dirty_list);
clear_bit(BTRFS_ROOT_DIRTY, &root->state);
if (root != fs_info->extent_root)
list_add_tail(&root->dirty_list,