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jbd2: Use atomic variables to avoid taking t_handle_lock in jbd2_journal_stop

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By using an atomic_t for t_updates and t_outstanding credits, this
should allow us to not need to take transaction t_handle_lock in
jbd2_journal_stop().

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o
2010-08-02 08:43:25 -04:00
parent 8b67f04ab9
commit a51dca9cd3
4 changed files with 51 additions and 41 deletions
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include/linux/jbd2.h
+4 -4
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@@ -601,13 +601,13 @@ struct transaction_s
* Number of outstanding updates running on this transaction
* [t_handle_lock]
*/
int t_updates;
atomic_t t_updates;
/*
* Number of buffers reserved for use by all handles in this transaction
* handle but not yet modified. [t_handle_lock]
*/
int t_outstanding_credits;
atomic_t t_outstanding_credits;
/*
* Forward and backward links for the circular list of all transactions
@@ -1258,8 +1258,8 @@ static inline int jbd_space_needed(journal_t *journal)
{
int nblocks = journal->j_max_transaction_buffers;
if (journal->j_committing_transaction)
nblocks += journal->j_committing_transaction->
t_outstanding_credits;
nblocks += atomic_read(&journal->j_committing_transaction->
t_outstanding_credits);
return nblocks;
}