diff options
| -rw-r--r-- | fs/jbd2/checkpoint.c | 8 | ||||
| -rw-r--r-- | fs/jbd2/journal.c | 29 | ||||
| -rw-r--r-- | fs/jbd2/transaction.c | 9 | ||||
| -rw-r--r-- | include/linux/jbd2.h | 32 |
4 files changed, 35 insertions, 43 deletions
diff --git a/fs/jbd2/checkpoint.c b/fs/jbd2/checkpoint.c index 65ec076..a572383 100644 --- a/fs/jbd2/checkpoint.c +++ b/fs/jbd2/checkpoint.c @@ -120,8 +120,8 @@ void __jbd2_log_wait_for_space(journal_t *journal) int nblocks, space_left; /* assert_spin_locked(&journal->j_state_lock); */ - nblocks = jbd_space_needed(journal); - while (__jbd2_log_space_left(journal) < nblocks) { + nblocks = jbd2_space_needed(journal); + while (jbd2_log_space_left(journal) < nblocks) { if (journal->j_flags & JBD2_ABORT) return; write_unlock(&journal->j_state_lock); @@ -140,8 +140,8 @@ void __jbd2_log_wait_for_space(journal_t *journal) */ write_lock(&journal->j_state_lock); spin_lock(&journal->j_list_lock); - nblocks = jbd_space_needed(journal); - space_left = __jbd2_log_space_left(journal); + nblocks = jbd2_space_needed(journal); + space_left = jbd2_log_space_left(journal); if (space_left < nblocks) { int chkpt = journal->j_checkpoint_transactions != NULL; tid_t tid = 0; diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c index 5ef0712..8e5486d 100644 --- a/fs/jbd2/journal.c +++ b/fs/jbd2/journal.c @@ -478,35 +478,6 @@ repeat: */ /* - * __jbd2_log_space_left: Return the number of free blocks left in the journal. - * - * Called with the journal already locked. - * - * Called under j_state_lock - */ - -int __jbd2_log_space_left(journal_t *journal) -{ - int left = journal->j_free; - - /* assert_spin_locked(&journal->j_state_lock); */ - - /* - * Be pessimistic here about the number of those free blocks which - * might be required for log descriptor control blocks. - */ - -#define MIN_LOG_RESERVED_BLOCKS 32 /* Allow for rounding errors */ - - left -= MIN_LOG_RESERVED_BLOCKS; - - if (left <= 0) - return 0; - left -= (left >> 3); - return left; -} - -/* * Called with j_state_lock locked for writing. * Returns true if a transaction commit was started. */ diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c index 60361c6..f9cd431 100644 --- a/fs/jbd2/transaction.c +++ b/fs/jbd2/transaction.c @@ -283,12 +283,12 @@ repeat: * reduce the free space arbitrarily. Be careful to account for * those buffers when checkpointing. */ - if (__jbd2_log_space_left(journal) < jbd_space_needed(journal)) { + if (jbd2_log_space_left(journal) < jbd2_space_needed(journal)) { jbd_debug(2, "Handle %p waiting for checkpoint...\n", handle); atomic_sub(nblocks, &transaction->t_outstanding_credits); read_unlock(&journal->j_state_lock); write_lock(&journal->j_state_lock); - if (__jbd2_log_space_left(journal) < jbd_space_needed(journal)) + if (jbd2_log_space_left(journal) < jbd2_space_needed(journal)) __jbd2_log_wait_for_space(journal); write_unlock(&journal->j_state_lock); goto repeat; @@ -306,7 +306,7 @@ repeat: jbd_debug(4, "Handle %p given %d credits (total %d, free %d)\n", handle, nblocks, atomic_read(&transaction->t_outstanding_credits), - __jbd2_log_space_left(journal)); + jbd2_log_space_left(journal)); read_unlock(&journal->j_state_lock); lock_map_acquire(&handle->h_lockdep_map); @@ -441,7 +441,8 @@ int jbd2_journal_extend(handle_t *handle, int nblocks) goto unlock; } - if (wanted > __jbd2_log_space_left(journal)) { + 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); goto unlock; diff --git a/include/linux/jbd2.h b/include/linux/jbd2.h index e33e84b..7a1f6cd 100644 --- a/include/linux/jbd2.h +++ b/include/linux/jbd2.h @@ -1220,7 +1220,6 @@ extern void jbd2_clear_buffer_revoked_flags(journal_t *journal); * transitions on demand. */ -int __jbd2_log_space_left(journal_t *); /* Called with journal locked */ int jbd2_log_start_commit(journal_t *journal, tid_t tid); int __jbd2_log_start_commit(journal_t *journal, tid_t tid); int jbd2_journal_start_commit(journal_t *journal, tid_t *tid); @@ -1291,16 +1290,37 @@ extern int jbd2_journal_blocks_per_page(struct inode *inode); extern size_t journal_tag_bytes(journal_t *journal); /* + * We reserve t_outstanding_credits >> JBD2_CONTROL_BLOCKS_SHIFT for + * transaction control blocks. + */ +#define JBD2_CONTROL_BLOCKS_SHIFT 5 + +/* * Return the minimum number of blocks which must be free in the journal * before a new transaction may be started. Must be called under j_state_lock. */ -static inline int jbd_space_needed(journal_t *journal) +static inline int jbd2_space_needed(journal_t *journal) { int nblocks = journal->j_max_transaction_buffers; - if (journal->j_committing_transaction) - nblocks += atomic_read(&journal->j_committing_transaction-> - t_outstanding_credits); - return nblocks; + return nblocks + (nblocks >> JBD2_CONTROL_BLOCKS_SHIFT); +} + +/* + * Return number of free blocks in the log. Must be called under j_state_lock. + */ +static inline unsigned long jbd2_log_space_left(journal_t *journal) +{ + /* Allow for rounding errors */ + unsigned long free = journal->j_free - 32; + + if (journal->j_committing_transaction) { + unsigned long committing = atomic_read(&journal-> + j_committing_transaction->t_outstanding_credits); + + /* Transaction + control blocks */ + free -= committing + (committing >> JBD2_CONTROL_BLOCKS_SHIFT); + } + return free; } /* |
