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jbd2: refactor wait logic for transaction updates into a common function

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No functionality change as such in this patch. This only refactors the
common piece of code which waits for t_updates to finish into a common
function named as jbd2_journal_wait_updates(journal_t *)

Signed-off-by: Ritesh Harjani <riteshh@linux.ibm.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/8c564f70f4b2591171677a2a74fccb22a7b6c3a4.1642416995.git.riteshh@linux.ibm.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Ritesh Harjani 2022-01-17 17:41:51 +05:30 committed by Theodore Ts'o
parent 3ca40c0d32
commit 4f98186848
3 changed files with 38 additions and 38 deletions
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19
fs/jbd2/commit.c
View File

@ -484,22 +484,9 @@ void jbd2_journal_commit_transaction(journal_t *journal)
stats.run.rs_running = jbd2_time_diff(commit_transaction->t_start,
stats.run.rs_locked);
spin_lock(&commit_transaction->t_handle_lock);
while (atomic_read(&commit_transaction->t_updates)) {
DEFINE_WAIT(wait);
// waits for any t_updates to finish
jbd2_journal_wait_updates(journal);
prepare_to_wait(&journal->j_wait_updates, &wait,
TASK_UNINTERRUPTIBLE);
if (atomic_read(&commit_transaction->t_updates)) {
spin_unlock(&commit_transaction->t_handle_lock);
write_unlock(&journal->j_state_lock);
schedule();
write_lock(&journal->j_state_lock);
spin_lock(&commit_transaction->t_handle_lock);
}
finish_wait(&journal->j_wait_updates, &wait);
}
spin_unlock(&commit_transaction->t_handle_lock);
commit_transaction->t_state = T_SWITCH;
write_unlock(&journal->j_state_lock);
@ -817,7 +804,7 @@ start_journal_io:
commit_transaction->t_state = T_COMMIT_DFLUSH;
write_unlock(&journal->j_state_lock);
/*
/*
* If the journal is not located on the file system device,
* then we must flush the file system device before we issue
* the commit record

53
fs/jbd2/transaction.c
View File

@ -449,7 +449,7 @@ repeat:
}
/* OK, account for the buffers that this operation expects to
* use and add the handle to the running transaction.
* use and add the handle to the running transaction.
*/
update_t_max_wait(transaction, ts);
handle->h_transaction = transaction;
@ -836,6 +836,35 @@ int jbd2_journal_restart(handle_t *handle, int nblocks)
}
EXPORT_SYMBOL(jbd2_journal_restart);
/*
* Waits for any outstanding t_updates to finish.
* This is called with write j_state_lock held.
*/
void jbd2_journal_wait_updates(journal_t *journal)
{
transaction_t *commit_transaction = journal->j_running_transaction;
if (!commit_transaction)
return;
spin_lock(&commit_transaction->t_handle_lock);
while (atomic_read(&commit_transaction->t_updates)) {
DEFINE_WAIT(wait);
prepare_to_wait(&journal->j_wait_updates, &wait,
TASK_UNINTERRUPTIBLE);
if (atomic_read(&commit_transaction->t_updates)) {
spin_unlock(&commit_transaction->t_handle_lock);
write_unlock(&journal->j_state_lock);
schedule();
write_lock(&journal->j_state_lock);
spin_lock(&commit_transaction->t_handle_lock);
}
finish_wait(&journal->j_wait_updates, &wait);
}
spin_unlock(&commit_transaction->t_handle_lock);
}
/**
* jbd2_journal_lock_updates () - establish a transaction barrier.
* @journal: Journal to establish a barrier on.
@ -863,27 +892,9 @@ void jbd2_journal_lock_updates(journal_t *journal)
write_lock(&journal->j_state_lock);
}
/* Wait until there are no running updates */
while (1) {
transaction_t *transaction = journal->j_running_transaction;
/* Wait until there are no running t_updates */
jbd2_journal_wait_updates(journal);
if (!transaction)
break;
spin_lock(&transaction->t_handle_lock);
prepare_to_wait(&journal->j_wait_updates, &wait,
TASK_UNINTERRUPTIBLE);
if (!atomic_read(&transaction->t_updates)) {
spin_unlock(&transaction->t_handle_lock);
finish_wait(&journal->j_wait_updates, &wait);
break;
}
spin_unlock(&transaction->t_handle_lock);
write_unlock(&journal->j_state_lock);
schedule();
finish_wait(&journal->j_wait_updates, &wait);
write_lock(&journal->j_state_lock);
}
write_unlock(&journal->j_state_lock);
/*

4
include/linux/jbd2.h
View File

@ -594,7 +594,7 @@ struct transaction_s
*/
unsigned long t_log_start;
/*
/*
* Number of buffers on the t_buffers list [j_list_lock, no locks
* needed for jbd2 thread]
*/
@ -1538,6 +1538,8 @@ extern int jbd2_journal_flush(journal_t *journal, unsigned int flags);
extern void jbd2_journal_lock_updates (journal_t *);
extern void jbd2_journal_unlock_updates (journal_t *);
void jbd2_journal_wait_updates(journal_t *);
extern journal_t * jbd2_journal_init_dev(struct block_device *bdev,
struct block_device *fs_dev,
unsigned long long start, int len, int bsize);