jbd2: precompute number of transaction descriptor blocks

Instead of computing the number of descriptor blocks a transaction can
have each time we need it (which is currently when starting each
transaction but will become more frequent later) precompute the number
once during journal initialization together with maximum transaction
size. We perform the precomputation whenever journal feature set is
updated similarly as for computation of
journal->j_revoke_records_per_block.

CC: stable@vger.kernel.org
Signed-off-by: Jan Kara <jack@suse.cz>
Reviewed-by: Zhang Yi <yi.zhang@huawei.com>
Link: https://patch.msgid.link/20240624170127.3253-2-jack@suse.cz
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index 7dea8cfe7162aa92a0c02844de7013d47b5240e2..2ae861abf77098ff8eb8e12bf207d013e99ea5f6 100644 (file)
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -1427,6 +1427,48 @@ static int journal_revoke_records_per_block(journal_t *journal)
        return space / record_size;
 }
 
+static int jbd2_journal_get_max_txn_bufs(journal_t *journal)
+{
+       return (journal->j_total_len - journal->j_fc_wbufsize) / 4;
+}
+
+/*
+ * Base amount of descriptor blocks we reserve for each transaction.
+ */
+static int jbd2_descriptor_blocks_per_trans(journal_t *journal)
+{
+       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(jbd2_journal_get_max_txn_bufs(journal),
+                               tags_per_block);
+}
+
+/*
+ * Initialize number of blocks each transaction reserves for its bookkeeping
+ * and maximum number of blocks a transaction can use. This needs to be called
+ * after the journal size and the fastcommit area size are initialized.
+ */
+static void jbd2_journal_init_transaction_limits(journal_t *journal)
+{
+       journal->j_revoke_records_per_block =
+                               journal_revoke_records_per_block(journal);
+       journal->j_transaction_overhead_buffers =
+                               jbd2_descriptor_blocks_per_trans(journal);
+       journal->j_max_transaction_buffers =
+                               jbd2_journal_get_max_txn_bufs(journal);
+}
+
 /*
  * Load the on-disk journal superblock and read the key fields into the
  * journal_t.
@@ -1468,8 +1510,8 @@ static int journal_load_superblock(journal_t *journal)
        if (jbd2_journal_has_csum_v2or3(journal))
                journal->j_csum_seed = jbd2_chksum(journal, ~0, sb->s_uuid,
                                                   sizeof(sb->s_uuid));
-       journal->j_revoke_records_per_block =
-                               journal_revoke_records_per_block(journal);
+       /* After journal features are set, we can compute transaction limits */
+       jbd2_journal_init_transaction_limits(journal);
 
        if (jbd2_has_feature_fast_commit(journal)) {
                journal->j_fc_last = be32_to_cpu(sb->s_maxlen);
@@ -1674,11 +1716,6 @@ journal_t *jbd2_journal_init_inode(struct inode *inode)
        return journal;
 }
 
-static int jbd2_journal_get_max_txn_bufs(journal_t *journal)
-{
-       return (journal->j_total_len - journal->j_fc_wbufsize) / 4;
-}
-
 /*
  * Given a journal_t structure, initialise the various fields for
  * startup of a new journaling session.  We use this both when creating
@@ -1724,8 +1761,6 @@ static int journal_reset(journal_t *journal)
        journal->j_commit_sequence = journal->j_transaction_sequence - 1;
        journal->j_commit_request = journal->j_commit_sequence;
 
-       journal->j_max_transaction_buffers = jbd2_journal_get_max_txn_bufs(journal);
-
        /*
         * Now that journal recovery is done, turn fast commits off here. This
         * way, if fast commit was enabled before the crash but if now FS has
@@ -2266,8 +2301,6 @@ jbd2_journal_initialize_fast_commit(journal_t *journal)
        journal->j_fc_first = journal->j_last + 1;
        journal->j_fc_off = 0;
        journal->j_free = journal->j_last - journal->j_first;
-       journal->j_max_transaction_buffers =
-               jbd2_journal_get_max_txn_bufs(journal);
 
        return 0;
 }
@@ -2355,8 +2388,7 @@ int jbd2_journal_set_features(journal_t *journal, unsigned long compat,
        sb->s_feature_ro_compat |= cpu_to_be32(ro);
        sb->s_feature_incompat  |= cpu_to_be32(incompat);
        unlock_buffer(journal->j_sb_buffer);
-       journal->j_revoke_records_per_block =
-                               journal_revoke_records_per_block(journal);
+       jbd2_journal_init_transaction_limits(journal);
 
        return 1;
 #undef COMPAT_FEATURE_ON
@@ -2387,8 +2419,7 @@ void jbd2_journal_clear_features(journal_t *journal, unsigned long compat,
        sb->s_feature_compat    &= ~cpu_to_be32(compat);
        sb->s_feature_ro_compat &= ~cpu_to_be32(ro);
        sb->s_feature_incompat  &= ~cpu_to_be32(incompat);
-       journal->j_revoke_records_per_block =
-                               journal_revoke_records_per_block(journal);
+       jbd2_journal_init_transaction_limits(journal);
 }
 EXPORT_SYMBOL(jbd2_journal_clear_features);
 

diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c
index cb0b8d6fc0c6dbfc98fca854d737bb979188c5c4..a095f1a3114bb6c35d7b129423d19a078fd7ab72 100644 (file)
--- a/fs/jbd2/transaction.c
+++ b/fs/jbd2/transaction.c
@@ -62,28 +62,6 @@ void jbd2_journal_free_transaction(transaction_t *transaction)
        kmem_cache_free(transaction_cache, transaction);
 }
 
-/*
- * Base amount of descriptor blocks we reserve for each transaction.
- */
-static int jbd2_descriptor_blocks_per_trans(journal_t *journal)
-{
-       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);
-}
-
 /*
  * jbd2_get_transaction: obtain a new transaction_t object.
  *
@@ -109,7 +87,7 @@ static void jbd2_get_transaction(journal_t *journal,
        transaction->t_expires = jiffies + journal->j_commit_interval;
        atomic_set(&transaction->t_updates, 0);
        atomic_set(&transaction->t_outstanding_credits,
-                  jbd2_descriptor_blocks_per_trans(journal) +
+                  journal->j_transaction_overhead_buffers +
                   atomic_read(&journal->j_reserved_credits));
        atomic_set(&transaction->t_outstanding_revokes, 0);
        atomic_set(&transaction->t_handle_count, 0);

diff --git a/include/linux/jbd2.h b/include/linux/jbd2.h
index f91b930abe20fb355fdd7db836bfa77979f037f0..b900c642210cd5af4b26a9d5af2a269e8558e2ff 100644 (file)
--- a/include/linux/jbd2.h
+++ b/include/linux/jbd2.h
@@ -1085,6 +1085,13 @@ struct journal_s
         */
        int                     j_revoke_records_per_block;
 
+       /**
+        * @j_transaction_overhead:
+        *
+        * Number of blocks each transaction needs for its own bookkeeping
+        */
+       int                     j_transaction_overhead_buffers;
+
        /**
         * @j_commit_interval:
         *