diff options
| author | Jan Kara <jack@suse.cz> | 2019-11-05 17:44:24 +0100 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2019-11-05 22:00:48 +0100 |
| commit | 9f356e5a4f12008fa0df8b6385fc0ab830416e72 (patch) | |
| tree | 6ec4a24cc440123cd810bf520c609d01abe0ebd3 /fs/jbd2/transaction.c | |
| parent | jbd2: Factor out common parts of stopping and restarting a handle (diff) | |
| download | linux-9f356e5a4f12008fa0df8b6385fc0ab830416e72.tar.xz linux-9f356e5a4f12008fa0df8b6385fc0ab830416e72.zip | |
jbd2: Account descriptor blocks into t_outstanding_credits
Currently, journal descriptor blocks were not accounted in
transaction->t_outstanding_credits and we were just leaving some slack
space in the journal for them (in jbd2_log_space_left() and
jbd2_space_needed()). This is making proper accounting (and reservation
we want to add) of descriptor blocks difficult so switch to accounting
descriptor blocks in transaction->t_outstanding_credits and just reserve
the same amount of credits in t_outstanding credits for journal
descriptor blocks when creating transaction.
Signed-off-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20191105164437.32602-18-jack@suse.cz
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/jbd2/transaction.c')
| -rw-r--r-- | fs/jbd2/transaction.c | 20 |
1 files changed, 12 insertions, 8 deletions
diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c index b30df011beaa..ed7cf9e62584 100644 --- a/fs/jbd2/transaction.c +++ b/fs/jbd2/transaction.c @@ -63,6 +63,17 @@ void jbd2_journal_free_transaction(transaction_t *transaction) } /* + * We reserve t_outstanding_credits >> JBD2_CONTROL_BLOCKS_SHIFT for + * transaction descriptor blocks. + */ +#define JBD2_CONTROL_BLOCKS_SHIFT 5 + +static int jbd2_descriptor_blocks_per_trans(journal_t *journal) +{ + return journal->j_max_transaction_buffers >> JBD2_CONTROL_BLOCKS_SHIFT; +} + +/* * jbd2_get_transaction: obtain a new transaction_t object. * * Simply initialise a new transaction. Initialize it in @@ -88,6 +99,7 @@ static void jbd2_get_transaction(journal_t *journal, spin_lock_init(&transaction->t_handle_lock); atomic_set(&transaction->t_updates, 0); atomic_set(&transaction->t_outstanding_credits, + jbd2_descriptor_blocks_per_trans(journal) + atomic_read(&journal->j_reserved_credits)); atomic_set(&transaction->t_handle_count, 0); INIT_LIST_HEAD(&transaction->t_inode_list); @@ -634,14 +646,6 @@ int jbd2_journal_extend(handle_t *handle, int nblocks) goto unlock; } - if (wanted + (wanted >> JBD2_CONTROL_BLOCKS_SHIFT) > - jbd2_log_space_left(journal)) { - jbd_debug(3, "denied handle %p %d blocks: " - "insufficient log space\n", handle, nblocks); - atomic_sub(nblocks, &transaction->t_outstanding_credits); - goto unlock; - } - trace_jbd2_handle_extend(journal->j_fs_dev->bd_dev, transaction->t_tid, handle->h_type, handle->h_line_no, |