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btrfs: switch to refcount_t type for btrfs_trans_handle::use_count 

The use_count is a reference counter, we can use the refcount_t type,
though we don't use the atomicity. This is not a performance critical
code and we could catch the underflows. The type is changed from long,
but the number of references will fit an int.

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2017-11-08 01:39:58 +01:00
parent 2dbda74ed9
commit b50fff816c
2 changed files with 7 additions and 7 deletions
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12
fs/btrfs/transaction.c
View File

@ -495,8 +495,8 @@ start_transaction(struct btrfs_root *root, unsigned int num_items,
if (current->journal_info) { if (current->journal_info) {
WARN_ON(type & TRANS_EXTWRITERS); WARN_ON(type & TRANS_EXTWRITERS);
h = current->journal_info; h = current->journal_info;
h->use_count++; refcount_inc(&h->use_count);
WARN_ON(h->use_count > 2); WARN_ON(refcount_read(&h->use_count) > 2);
h->orig_rsv = h->block_rsv; h->orig_rsv = h->block_rsv;
h->block_rsv = NULL; h->block_rsv = NULL;
goto got_it; goto got_it;
@ -567,7 +567,7 @@ again:
h->transid = cur_trans->transid; h->transid = cur_trans->transid;
h->transaction = cur_trans; h->transaction = cur_trans;
h->root = root; h->root = root;
h->use_count = 1; refcount_set(&h->use_count, 1);
h->fs_info = root->fs_info; h->fs_info = root->fs_info;
h->type = type; h->type = type;
@ -837,8 +837,8 @@ static int __btrfs_end_transaction(struct btrfs_trans_handle *trans,
int err = 0; int err = 0;
int must_run_delayed_refs = 0; int must_run_delayed_refs = 0;
if (trans->use_count > 1) { if (refcount_read(&trans->use_count) > 1) {
trans->use_count--; refcount_dec(&trans->use_count);
trans->block_rsv = trans->orig_rsv; trans->block_rsv = trans->orig_rsv;
return 0; return 0;
} }
@ -1868,7 +1868,7 @@ static void cleanup_transaction(struct btrfs_trans_handle *trans,
struct btrfs_transaction *cur_trans = trans->transaction; struct btrfs_transaction *cur_trans = trans->transaction;
DEFINE_WAIT(wait); DEFINE_WAIT(wait);
WARN_ON(trans->use_count > 1); WARN_ON(refcount_read(&trans->use_count) > 1);
btrfs_abort_transaction(trans, err); btrfs_abort_transaction(trans, err);

2
fs/btrfs/transaction.h
View File

@ -111,7 +111,7 @@ struct btrfs_trans_handle {
u64 transid; u64 transid;
u64 bytes_reserved; u64 bytes_reserved;
u64 chunk_bytes_reserved; u64 chunk_bytes_reserved;
unsigned long use_count; refcount_t use_count;
unsigned long delayed_ref_updates; unsigned long delayed_ref_updates;
struct btrfs_transaction *transaction; struct btrfs_transaction *transaction;
struct btrfs_block_rsv *block_rsv; struct btrfs_block_rsv *block_rsv;