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Message-Id: <1307262510-16376-1-git-send-email-mkatiyar@gmail.com>
Date: Sun, 5 Jun 2011 01:28:30 -0700
From: Manish Katiyar <mkatiyar@...il.com>
To: jack@...e.cz, tytso@....edu, linux-ext4@...r.kernel.org
Cc: Manish Katiyar <mkatiyar@...il.com>
Subject: [PATCH] jbd2:Make journal transaction allocations come from its own cache.
Add a cache for jbd2 journal transaction allocations. This also
helps to leverage fault-injection framework to test various memory
allocation failures in the jbd2 layer.
Signed-off-by: Manish Katiyar <mkatiyar@...il.com>
---
fs/jbd2/checkpoint.c | 2 +-
fs/jbd2/commit.c | 2 +-
fs/jbd2/journal.c | 25 +++++++++++++++++++++++++
fs/jbd2/transaction.c | 7 ++++---
include/linux/jbd2.h | 21 +++++++++++++++++++++
5 files changed, 52 insertions(+), 5 deletions(-)
diff --git a/fs/jbd2/checkpoint.c b/fs/jbd2/checkpoint.c
index 6a79fd0..6f554ce 100644
--- a/fs/jbd2/checkpoint.c
+++ b/fs/jbd2/checkpoint.c
@@ -716,7 +716,7 @@ int __jbd2_journal_remove_checkpoint(struct journal_head *jh)
transaction->t_tid, stats);
__jbd2_journal_drop_transaction(journal, transaction);
- kfree(transaction);
+ jbd2_free_transaction(transaction);
/* Just in case anybody was waiting for more transactions to be
checkpointed... */
diff --git a/fs/jbd2/commit.c b/fs/jbd2/commit.c
index 7f21cf3..8e33d84 100644
--- a/fs/jbd2/commit.c
+++ b/fs/jbd2/commit.c
@@ -1037,7 +1037,7 @@ restart_loop:
jbd_debug(1, "JBD: commit %d complete, head %d\n",
journal->j_commit_sequence, journal->j_tail_sequence);
if (to_free)
- kfree(commit_transaction);
+ jbd2_free_transaction(commit_transaction);
wake_up(&journal->j_wait_done_commit);
}
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index 9a78269..c0ec463 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -95,6 +95,7 @@ EXPORT_SYMBOL(jbd2_journal_init_jbd_inode);
EXPORT_SYMBOL(jbd2_journal_release_jbd_inode);
EXPORT_SYMBOL(jbd2_journal_begin_ordered_truncate);
EXPORT_SYMBOL(jbd2_inode_cache);
+EXPORT_SYMBOL(jbd2_transaction_cache);
static int journal_convert_superblock_v1(journal_t *, journal_superblock_t *);
static void __journal_abort_soft (journal_t *journal, int errno);
@@ -2371,6 +2372,27 @@ static void jbd2_journal_destroy_handle_cache(void)
}
+struct kmem_cache *jbd2_transaction_cache;
+
+static int journal_init_transaction_cache(void)
+{
+ J_ASSERT(jbd2_transaction_cache == NULL);
+ jbd2_transaction_cache = kmem_cache_create("jbd2_transaction",
+ sizeof(transaction_t),
+ 0, SLAB_TEMPORARY, NULL);
+ if (jbd2_transaction_cache == NULL) {
+ printk(KERN_EMERG "JBD2: failed to create transaction cache\n");
+ return -ENOMEM;
+ }
+ return 0;
+}
+
+static void jbd2_journal_destroy_transaction_cache(void)
+{
+ if (jbd2_transaction_cache)
+ kmem_cache_destroy(jbd2_transaction_cache);
+}
+
/*
* Module startup and shutdown
*/
@@ -2384,6 +2406,8 @@ static int __init journal_init_caches(void)
ret = journal_init_jbd2_journal_head_cache();
if (ret == 0)
ret = journal_init_handle_cache();
+ if (ret == 0)
+ ret = journal_init_transaction_cache();
return ret;
}
@@ -2392,6 +2416,7 @@ static void jbd2_journal_destroy_caches(void)
jbd2_journal_destroy_revoke_caches();
jbd2_journal_destroy_jbd2_journal_head_cache();
jbd2_journal_destroy_handle_cache();
+ jbd2_journal_destroy_transaction_cache();
jbd2_journal_destroy_slabs();
}
diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c
index 3eec82d..58fbec7 100644
--- a/fs/jbd2/transaction.c
+++ b/fs/jbd2/transaction.c
@@ -131,7 +131,7 @@ static int start_this_handle(journal_t *journal, handle_t *handle,
alloc_transaction:
if (!journal->j_running_transaction) {
- new_transaction = kzalloc(sizeof(*new_transaction), gfp_mask);
+ new_transaction = jbd2_alloc_transaction(gfp_mask);
if (!new_transaction) {
/*
* If __GFP_FS is not present, then we may be
@@ -160,7 +160,7 @@ repeat:
if (is_journal_aborted(journal) ||
(journal->j_errno != 0 && !(journal->j_flags & JBD2_ACK_ERR))) {
read_unlock(&journal->j_state_lock);
- kfree(new_transaction);
+ jbd2_free_transaction(new_transaction);
return -EROFS;
}
@@ -282,7 +282,8 @@ repeat:
read_unlock(&journal->j_state_lock);
lock_map_acquire(&handle->h_lockdep_map);
- kfree(new_transaction);
+ jbd2_free_transaction(new_transaction);
+
return 0;
}
diff --git a/include/linux/jbd2.h b/include/linux/jbd2.h
index 4ecb7b1..df7f101 100644
--- a/include/linux/jbd2.h
+++ b/include/linux/jbd2.h
@@ -1184,6 +1184,27 @@ static inline void jbd2_free_handle(handle_t *handle)
}
/*
+ * transaction management
+ */
+extern struct kmem_cache *jbd2_transaction_cache;
+
+static inline transaction_t *jbd2_alloc_transaction(gfp_t gfp_flags)
+{
+ return kmem_cache_zalloc(jbd2_transaction_cache, gfp_flags);
+}
+
+static inline void jbd2_free_transaction(transaction_t *transaction)
+{
+ if (transaction) {
+#ifdef CONFIG_JBD2_DEBUG
+ memset(transaction, JBD2_POISON_FREE, sizeof(*transaction));
+#endif
+ kmem_cache_free(jbd2_transaction_cache, transaction);
+ }
+}
+
+
+/*
* jbd2_inode management (optional, for those file systems that want to use
* dynamically allocated jbd2_inode structures)
*/
--
1.7.4.1
--
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