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authorJosef Bacik <josef@redhat.com>2011-04-05 17:57:27 +0200
committerJosef Bacik <josef@redhat.com>2011-04-08 19:00:32 +0200
commit06d5a5899d6d3ac401d2359b5eac6d2a3a0fe331 (patch)
treeff26c40dec6e649dca7316ce10412cc6c0ace985 /fs/btrfs/transaction.c
parentBtrfs: deal with the case that we run out of space in the cache (diff)
downloadlinux-06d5a5899d6d3ac401d2359b5eac6d2a3a0fe331.tar.xz
linux-06d5a5899d6d3ac401d2359b5eac6d2a3a0fe331.zip
Btrfs: only retry transaction reservation once
I saw a lockup where we kept getting into this start transaction->commit transaction loop because of enospce. The fact is if we fail to make our reservation, we've tried _everything_ several times, so we only need to try and commit the transaction once, and if that doesn't work then we really are out of space and need to just exit. Thanks, Signed-off-by: Josef Bacik <josef@redhat.com>
Diffstat (limited to 'fs/btrfs/transaction.c')
-rw-r--r--fs/btrfs/transaction.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index 5b158da7e0bb..4583008217e6 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -181,6 +181,7 @@ static struct btrfs_trans_handle *start_transaction(struct btrfs_root *root,
{
struct btrfs_trans_handle *h;
struct btrfs_transaction *cur_trans;
+ int retries = 0;
int ret;
if (root->fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR)
@@ -224,10 +225,18 @@ again:
if (num_items > 0) {
ret = btrfs_trans_reserve_metadata(h, root, num_items);
- if (ret == -EAGAIN) {
+ if (ret == -EAGAIN && !retries) {
+ retries++;
btrfs_commit_transaction(h, root);
goto again;
+ } else if (ret == -EAGAIN) {
+ /*
+ * We have already retried and got EAGAIN, so really we
+ * don't have space, so set ret to -ENOSPC.
+ */
+ ret = -ENOSPC;
}
+
if (ret < 0) {
btrfs_end_transaction(h, root);
return ERR_PTR(ret);