diff options
| -rw-r--r-- | fs/jbd2/transaction.c | 21 |
1 files changed, 16 insertions, 5 deletions
diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c index a3374c1a3d41..a9d3a2208506 100644 --- a/fs/jbd2/transaction.c +++ b/fs/jbd2/transaction.c @@ -63,14 +63,25 @@ void jbd2_journal_free_transaction(transaction_t *transaction) } /* - * We reserve t_outstanding_credits >> JBD2_CONTROL_BLOCKS_SHIFT for - * transaction descriptor blocks. + * Base amount of descriptor blocks we reserve for each transaction. */ -#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; + int tag_space = journal->j_blocksize - sizeof(journal_header_t); + int tags_per_block; + + /* Subtract UUID */ + tag_space -= 16; + if (jbd2_journal_has_csum_v2or3(journal)) + tag_space -= sizeof(struct jbd2_journal_block_tail); + /* Commit code leaves a slack space of 16 bytes at the end of block */ + tags_per_block = (tag_space - 16) / journal_tag_bytes(journal); + /* + * Revoke descriptors are accounted separately so we need to reserve + * space for commit block and normal transaction descriptor blocks. + */ + return 1 + DIV_ROUND_UP(journal->j_max_transaction_buffers, + tags_per_block); } /* |