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authorJan Kara <jack@suse.cz>2019-11-05 17:44:24 +0100
committerTheodore Ts'o <tytso@mit.edu>2019-11-05 16:00:48 -0500
commit9f356e5a4f12008fa0df8b6385fc0ab830416e72 (patch)
tree6ec4a24cc440123cd810bf520c609d01abe0ebd3 /fs/jbd2
parentec8b6f600e49dc87a8564807fec4193bf93ee2b5 (diff)
downloadlinux-9f356e5a4f12008fa0df8b6385fc0ab830416e72.tar.bz2
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')
-rw-r--r--fs/jbd2/commit.c6
-rw-r--r--fs/jbd2/journal.c1
-rw-r--r--fs/jbd2/transaction.c20
3 files changed, 17 insertions, 10 deletions
diff --git a/fs/jbd2/commit.c b/fs/jbd2/commit.c
index b67e2d0cff88..9047f8e269d0 100644
--- a/fs/jbd2/commit.c
+++ b/fs/jbd2/commit.c
@@ -560,8 +560,7 @@ void jbd2_journal_commit_transaction(journal_t *journal)
stats.run.rs_logging = jiffies;
stats.run.rs_flushing = jbd2_time_diff(stats.run.rs_flushing,
stats.run.rs_logging);
- stats.run.rs_blocks =
- atomic_read(&commit_transaction->t_outstanding_credits);
+ stats.run.rs_blocks = commit_transaction->t_nr_buffers;
stats.run.rs_blocks_logged = 0;
J_ASSERT(commit_transaction->t_nr_buffers <=
@@ -889,6 +888,9 @@ start_journal_io:
if (err)
jbd2_journal_abort(journal, err);
+ WARN_ON_ONCE(
+ atomic_read(&commit_transaction->t_outstanding_credits) < 0);
+
/*
* Now disk caches for filesystem device are flushed so we are safe to
* erase checkpointed transactions from the log by updating journal
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index cc11097f1176..22b14b3ca197 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -840,6 +840,7 @@ jbd2_journal_get_descriptor_buffer(transaction_t *transaction, int type)
bh = __getblk(journal->j_dev, blocknr, journal->j_blocksize);
if (!bh)
return NULL;
+ atomic_dec(&transaction->t_outstanding_credits);
lock_buffer(bh);
memset(bh->b_data, 0, journal->j_blocksize);
header = (journal_header_t *)bh->b_data;
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,