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authorJan Kara <jack@suse.cz>2013-06-04 12:12:57 -0400
committerTheodore Ts'o <tytso@mit.edu>2013-06-04 12:12:57 -0400
commit76c39904561004ac8675f858a290129e439d5168 (patch)
tree46b2c2800ffbad5dd2ebd4ceb66893414630df2b /fs/jbd2
parent2f387f849b6a5be5b4b914c43a8af0406279db11 (diff)
downloadlinux-76c39904561004ac8675f858a290129e439d5168.tar.bz2
jbd2: cleanup needed free block estimates when starting a transaction
__jbd2_log_space_left() and jbd_space_needed() were kind of odd. jbd_space_needed() accounted also credits needed for currently committing transaction while it didn't account for credits needed for control blocks. __jbd2_log_space_left() then accounted for control blocks as a fraction of free space. Since results of these two functions are always only compared against each other, this works correct but is somewhat strange. Move the estimates so that jbd_space_needed() returns number of blocks needed for a transaction including control blocks and __jbd2_log_space_left() returns free space in the journal (with the committing transaction already subtracted). Rename functions to jbd2_log_space_left() and jbd2_space_needed() while we are changing them. Reviewed-by: Zheng Liu <wenqing.lz@taobao.com> Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/jbd2')
-rw-r--r--fs/jbd2/checkpoint.c8
-rw-r--r--fs/jbd2/journal.c29
-rw-r--r--fs/jbd2/transaction.c9
3 files changed, 9 insertions, 37 deletions
diff --git a/fs/jbd2/checkpoint.c b/fs/jbd2/checkpoint.c
index 65ec076e41f2..a572383bcf99 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 5ef0712e2f7a..8e5486d62e89 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 60361c634b5d..f9cd43190b43 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;