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authorTheodore Ts'o <tytso@mit.edu>2014-03-09 07:34:10 +0400
committerTheodore Ts'o <tytso@mit.edu>2014-03-09 07:34:10 +0400
commitd4e839d4a9dc31d0c229e616146b01e1ace56604 (patch)
tree1a04beaeb6a438212db18548f5e0ff37b048f973 /fs/jbd2
parent42cf3452d5f5b0817d27c93e4e7d7eab6e89077d (diff)
downloadlinux-d4e839d4a9dc31d0c229e616146b01e1ace56604.tar.xz
jbd2: add transaction to checkpoint list earlier
We don't otherwise need j_list_lock during the rest of commit phase #7, so add the transaction to the checkpoint list at the very end of commit phase #6. This allows us to drop j_list_lock earlier, which is a good thing since it is a super hot lock. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/jbd2')
-rw-r--r--fs/jbd2/commit.c39
1 files changed, 20 insertions, 19 deletions
diff --git a/fs/jbd2/commit.c b/fs/jbd2/commit.c
index af36252b5b2d..5f26139a165a 100644
--- a/fs/jbd2/commit.c
+++ b/fs/jbd2/commit.c
@@ -1065,6 +1065,25 @@ restart_loop:
goto restart_loop;
}
+ /* Add the transaction to the checkpoint list
+ * __journal_remove_checkpoint() can not destroy transaction
+ * under us because it is not marked as T_FINISHED yet */
+ if (journal->j_checkpoint_transactions == NULL) {
+ journal->j_checkpoint_transactions = commit_transaction;
+ commit_transaction->t_cpnext = commit_transaction;
+ commit_transaction->t_cpprev = commit_transaction;
+ } else {
+ commit_transaction->t_cpnext =
+ journal->j_checkpoint_transactions;
+ commit_transaction->t_cpprev =
+ commit_transaction->t_cpnext->t_cpprev;
+ commit_transaction->t_cpnext->t_cpprev =
+ commit_transaction;
+ commit_transaction->t_cpprev->t_cpnext =
+ commit_transaction;
+ }
+ spin_unlock(&journal->j_list_lock);
+
/* Done with this transaction! */
jbd_debug(3, "JBD2: commit phase 7\n");
@@ -1103,24 +1122,6 @@ restart_loop:
write_unlock(&journal->j_state_lock);
- if (journal->j_checkpoint_transactions == NULL) {
- journal->j_checkpoint_transactions = commit_transaction;
- commit_transaction->t_cpnext = commit_transaction;
- commit_transaction->t_cpprev = commit_transaction;
- } else {
- commit_transaction->t_cpnext =
- journal->j_checkpoint_transactions;
- commit_transaction->t_cpprev =
- commit_transaction->t_cpnext->t_cpprev;
- commit_transaction->t_cpnext->t_cpprev =
- commit_transaction;
- commit_transaction->t_cpprev->t_cpnext =
- commit_transaction;
- }
- spin_unlock(&journal->j_list_lock);
- /* Drop all spin_locks because commit_callback may be block.
- * __journal_remove_checkpoint() can not destroy transaction
- * under us because it is not marked as T_FINISHED yet */
if (journal->j_commit_callback)
journal->j_commit_callback(journal, commit_transaction);
@@ -1131,7 +1132,7 @@ restart_loop:
write_lock(&journal->j_state_lock);
spin_lock(&journal->j_list_lock);
commit_transaction->t_state = T_FINISHED;
- /* Recheck checkpoint lists after j_list_lock was dropped */
+ /* Check if the transaction can be dropped now that we are finished */
if (commit_transaction->t_checkpoint_list == NULL &&
commit_transaction->t_checkpoint_io_list == NULL) {
__jbd2_journal_drop_transaction(journal, commit_transaction);