From: Jan Kara <jack@suse.cz>
To: Ted Tso <tytso@mit.edu>
Cc: <linux-ext4@vger.kernel.org>, Jan Kara <jack@suse.cz>
Subject: [PATCH 17/25] jbd2: Factor out common parts of stopping and restarting a handle
Date: Tue, 5 Nov 2019 17:44:23 +0100 [thread overview]
Message-ID: <20191105164437.32602-17-jack@suse.cz> (raw)
In-Reply-To: <20191003215523.7313-1-jack@suse.cz>
jbd2__journal_restart() has quite some code that is common with
jbd2_journal_stop(). Factor this functionality into stop_this_handle()
helper and use it from both functions. Note that this also drops
t_handle_lock protection from jbd2__journal_restart() as
jbd2_journal_stop() does the same thing without it.
Signed-off-by: Jan Kara <jack@suse.cz>
---
fs/jbd2/transaction.c | 98 ++++++++++++++++++++++++---------------------------
1 file changed, 46 insertions(+), 52 deletions(-)
diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c
index d648cec3f90f..b30df011beaa 100644
--- a/fs/jbd2/transaction.c
+++ b/fs/jbd2/transaction.c
@@ -512,12 +512,17 @@ handle_t *jbd2_journal_start(journal_t *journal, int nblocks)
}
EXPORT_SYMBOL(jbd2_journal_start);
-void jbd2_journal_free_reserved(handle_t *handle)
+static void __jbd2_journal_unreserve_handle(handle_t *handle)
{
journal_t *journal = handle->h_journal;
WARN_ON(!handle->h_reserved);
sub_reserved_credits(journal, handle->h_buffer_credits);
+}
+
+void jbd2_journal_free_reserved(handle_t *handle)
+{
+ __jbd2_journal_unreserve_handle(handle);
jbd2_free_handle(handle);
}
EXPORT_SYMBOL(jbd2_journal_free_reserved);
@@ -655,6 +660,28 @@ int jbd2_journal_extend(handle_t *handle, int nblocks)
return result;
}
+static void stop_this_handle(handle_t *handle)
+{
+ transaction_t *transaction = handle->h_transaction;
+ journal_t *journal = transaction->t_journal;
+
+ J_ASSERT(journal_current_handle() == handle);
+ J_ASSERT(atomic_read(&transaction->t_updates) > 0);
+ current->journal_info = NULL;
+ atomic_sub(handle->h_buffer_credits,
+ &transaction->t_outstanding_credits);
+ if (handle->h_rsv_handle)
+ __jbd2_journal_unreserve_handle(handle->h_rsv_handle);
+ if (atomic_dec_and_test(&transaction->t_updates))
+ wake_up(&journal->j_wait_updates);
+
+ rwsem_release(&journal->j_trans_commit_map, 1, _THIS_IP_);
+ /*
+ * Scope of the GFP_NOFS context is over here and so we can restore the
+ * original alloc context.
+ */
+ memalloc_nofs_restore(handle->saved_alloc_context);
+}
/**
* int jbd2_journal_restart() - restart a handle .
@@ -677,52 +704,34 @@ int jbd2__journal_restart(handle_t *handle, int nblocks, gfp_t gfp_mask)
transaction_t *transaction = handle->h_transaction;
journal_t *journal;
tid_t tid;
- int need_to_start, ret;
+ int need_to_start;
/* If we've had an abort of any type, don't even think about
* actually doing the restart! */
if (is_handle_aborted(handle))
return 0;
journal = transaction->t_journal;
+ tid = transaction->t_tid;
/*
* First unlink the handle from its current transaction, and start the
* commit on that.
*/
- J_ASSERT(atomic_read(&transaction->t_updates) > 0);
- J_ASSERT(journal_current_handle() == handle);
-
- read_lock(&journal->j_state_lock);
- spin_lock(&transaction->t_handle_lock);
- atomic_sub(handle->h_buffer_credits,
- &transaction->t_outstanding_credits);
- if (handle->h_rsv_handle) {
- sub_reserved_credits(journal,
- handle->h_rsv_handle->h_buffer_credits);
- }
- if (atomic_dec_and_test(&transaction->t_updates))
- wake_up(&journal->j_wait_updates);
- tid = transaction->t_tid;
- spin_unlock(&transaction->t_handle_lock);
+ jbd_debug(2, "restarting handle %p\n", handle);
+ stop_this_handle(handle);
handle->h_transaction = NULL;
- current->journal_info = NULL;
- jbd_debug(2, "restarting handle %p\n", handle);
+ /*
+ * TODO: If we use READ_ONCE / WRITE_ONCE for j_commit_request we can
+ * get rid of pointless j_state_lock traffic like this.
+ */
+ read_lock(&journal->j_state_lock);
need_to_start = !tid_geq(journal->j_commit_request, tid);
read_unlock(&journal->j_state_lock);
if (need_to_start)
jbd2_log_start_commit(journal, tid);
-
- rwsem_release(&journal->j_trans_commit_map, 1, _THIS_IP_);
handle->h_buffer_credits = nblocks;
- /*
- * Restore the original nofs context because the journal restart
- * is basically the same thing as journal stop and start.
- * start_this_handle will start a new nofs context.
- */
- memalloc_nofs_restore(handle->saved_alloc_context);
- ret = start_this_handle(journal, handle, gfp_mask);
- return ret;
+ return start_this_handle(journal, handle, gfp_mask);
}
EXPORT_SYMBOL(jbd2__journal_restart);
@@ -1718,16 +1727,12 @@ int jbd2_journal_stop(handle_t *handle)
* Handle is already detached from the transaction so there is
* nothing to do other than free the handle.
*/
- if (handle->h_rsv_handle)
- jbd2_free_handle(handle->h_rsv_handle);
+ memalloc_nofs_restore(handle->saved_alloc_context);
goto free_and_exit;
}
journal = transaction->t_journal;
tid = transaction->t_tid;
- J_ASSERT(journal_current_handle() == handle);
- J_ASSERT(atomic_read(&transaction->t_updates) > 0);
-
if (is_handle_aborted(handle))
err = -EIO;
@@ -1797,9 +1802,6 @@ int jbd2_journal_stop(handle_t *handle)
if (handle->h_sync)
transaction->t_synchronous_commit = 1;
- current->journal_info = NULL;
- atomic_sub(handle->h_buffer_credits,
- &transaction->t_outstanding_credits);
/*
* If the handle is marked SYNC, we need to set another commit
@@ -1826,27 +1828,19 @@ int jbd2_journal_stop(handle_t *handle)
}
/*
- * Once we drop t_updates, if it goes to zero the transaction
- * could start committing on us and eventually disappear. So
- * once we do this, we must not dereference transaction
- * pointer again.
+ * Once stop_this_handle() drops t_updates, the transaction could start
+ * committing on us and eventually disappear. So we must not
+ * dereference transaction pointer again after calling
+ * stop_this_handle().
*/
- if (atomic_dec_and_test(&transaction->t_updates))
- wake_up(&journal->j_wait_updates);
-
- rwsem_release(&journal->j_trans_commit_map, 1, _THIS_IP_);
+ stop_this_handle(handle);
if (wait_for_commit)
err = jbd2_log_wait_commit(journal, tid);
- if (handle->h_rsv_handle)
- jbd2_journal_free_reserved(handle->h_rsv_handle);
free_and_exit:
- /*
- * Scope of the GFP_NOFS context is over here and so we can restore the
- * original alloc context.
- */
- memalloc_nofs_restore(handle->saved_alloc_context);
+ if (handle->h_rsv_handle)
+ jbd2_free_handle(handle->h_rsv_handle);
jbd2_free_handle(handle);
return err;
}
--
2.16.4
next prev parent reply other threads:[~2019-11-05 16:44 UTC|newest]
Thread overview: 101+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-03 22:05 [PATCH 0/19 v3] ext4: Fix transaction overflow due to revoke descriptors Jan Kara
2019-10-03 22:05 ` [PATCH 01/22] jbd2: Fix possible overflow in jbd2_log_space_left() Jan Kara
2019-10-21 1:08 ` Theodore Y. Ts'o
2019-10-03 22:05 ` [PATCH 02/22] jbd2: Fixup stale comment in commit code Jan Kara
2019-10-21 1:08 ` Theodore Y. Ts'o
2019-10-03 22:05 ` [PATCH 03/22] ext4: Do not iput inode under running transaction in ext4_mkdir() Jan Kara
2019-10-21 1:21 ` Theodore Y. Ts'o
2019-10-24 10:19 ` Jan Kara
2019-10-24 12:09 ` Theodore Y. Ts'o
2019-10-24 13:37 ` Jan Kara
2019-11-04 12:35 ` Theodore Y. Ts'o
2019-10-03 22:05 ` [PATCH 04/22] ext4: Fix credit estimate for final inode freeing Jan Kara
2019-10-21 1:07 ` Theodore Y. Ts'o
2019-10-24 10:30 ` Jan Kara
2019-10-03 22:05 ` [PATCH 05/22] ext4: Fix ext4_should_journal_data() for EA inodes Jan Kara
2019-10-21 1:38 ` Theodore Y. Ts'o
2019-10-23 16:55 ` Jan Kara
2019-10-03 22:05 ` [PATCH 06/22] ext4: Use ext4_journal_extend() instead of jbd2_journal_extend() Jan Kara
2019-10-21 1:39 ` Theodore Y. Ts'o
2019-10-03 22:05 ` [PATCH 07/22] ext4: Avoid unnecessary revokes in ext4_alloc_branch() Jan Kara
2019-10-21 13:39 ` Theodore Y. Ts'o
2019-10-03 22:05 ` [PATCH 08/22] ext4: Provide function to handle transaction restarts Jan Kara
2019-10-21 16:20 ` Theodore Y. Ts'o
2019-10-23 16:25 ` Jan Kara
2019-10-03 22:05 ` [PATCH 09/22] ext4, jbd2: Provide accessor function for handle credits Jan Kara
2019-10-21 16:21 ` Theodore Y. Ts'o
2019-10-03 22:05 ` [PATCH 10/22] ocfs2: Use accessor function for h_buffer_credits Jan Kara
2019-10-21 16:21 ` Theodore Y. Ts'o
2019-10-03 22:05 ` [PATCH 11/22] jbd2: Fix statistics for the number of logged blocks Jan Kara
2019-10-21 16:24 ` Theodore Y. Ts'o
2019-10-03 22:05 ` [PATCH 12/22] jbd2: Reorganize jbd2_journal_stop() Jan Kara
2019-10-21 17:29 ` Theodore Y. Ts'o
2019-10-03 22:05 ` [PATCH 13/22] jbd2: Drop pointless check from jbd2_journal_stop() Jan Kara
2019-10-21 17:30 ` Theodore Y. Ts'o
2019-10-03 22:06 ` [PATCH 14/22] jbd2: Drop pointless wakeup " Jan Kara
2019-10-21 17:34 ` Theodore Y. Ts'o
2019-10-03 22:06 ` [PATCH 15/22] jbd2: Factor out common parts of stopping and restarting a handle Jan Kara
2019-10-21 17:49 ` Theodore Y. Ts'o
2019-10-23 16:17 ` Jan Kara
2019-11-04 12:36 ` Theodore Y. Ts'o
2019-11-04 12:59 ` Jan Kara
2019-10-03 22:06 ` [PATCH 16/22] jbd2: Account descriptor blocks into t_outstanding_credits Jan Kara
2019-10-21 21:04 ` Theodore Y. Ts'o
2019-10-23 13:09 ` Jan Kara
2019-10-03 22:06 ` [PATCH 17/22] jbd2: Drop jbd2_space_needed() Jan Kara
2019-10-21 21:05 ` Theodore Y. Ts'o
2019-10-03 22:06 ` [PATCH 18/22] jbd2: Reserve space for revoke descriptor blocks Jan Kara
2019-10-21 21:47 ` Theodore Y. Ts'o
2019-10-23 13:27 ` Jan Kara
2019-10-03 22:06 ` [PATCH 19/22] jbd2: Rename h_buffer_credits to h_total_credits Jan Kara
2019-10-21 21:48 ` Theodore Y. Ts'o
2019-10-03 22:06 ` [PATCH 20/22] jbd2: Make credit checking more strict Jan Kara
2019-10-21 22:29 ` Theodore Y. Ts'o
2019-10-23 13:30 ` Jan Kara
2019-10-03 22:06 ` [PATCH 21/22] ext4: Reserve revoke credits for freed blocks Jan Kara
2019-10-21 23:18 ` Theodore Y. Ts'o
2019-10-23 16:13 ` Jan Kara
2019-11-04 13:08 ` Theodore Y. Ts'o
2019-11-05 8:31 ` Jan Kara
2019-10-03 22:06 ` [PATCH 22/22] jbd2: Provide trace event for handle restarts Jan Kara
2019-10-21 23:18 ` Theodore Y. Ts'o
2019-10-19 19:19 ` [PATCH 0/19 v3] ext4: Fix transaction overflow due to revoke descriptors Theodore Y. Ts'o
2019-10-24 13:09 ` Jan Kara
2019-10-24 15:12 ` Jan Kara
2019-11-04 3:32 ` Theodore Y. Ts'o
2019-11-04 11:22 ` Jan Kara
2019-11-04 13:09 ` Theodore Y. Ts'o
2019-11-05 16:44 ` [PATCH 0/25 " Jan Kara
2019-11-05 16:44 ` [PATCH 01/25] jbd2: Fix possible overflow in jbd2_log_space_left() Jan Kara
2019-11-05 16:44 ` [PATCH 02/25] jbd2: Fixup stale comment in commit code Jan Kara
2019-11-05 16:44 ` [PATCH 03/25] jbd2: Completely fill journal descriptor blocks Jan Kara
2019-11-05 16:44 ` [PATCH 04/25] ext4: Move marking of handle as sync to ext4_add_nondir() Jan Kara
2019-11-05 16:44 ` [PATCH 05/25] ext4: Do not iput inode under running transaction Jan Kara
2019-11-05 16:44 ` [PATCH 06/25] ext4: Fix credit estimate for final inode freeing Jan Kara
2019-11-05 21:00 ` Theodore Y. Ts'o
2019-11-05 16:44 ` [PATCH 07/25] ext4: Fix ext4_should_journal_data() for EA inodes Jan Kara
2019-11-05 16:44 ` [PATCH 08/25] ext4: Use ext4_journal_extend() instead of jbd2_journal_extend() Jan Kara
2019-11-05 16:44 ` [PATCH 09/25] ext4: Avoid unnecessary revokes in ext4_alloc_branch() Jan Kara
2019-11-05 16:44 ` [PATCH 10/25] ext4: Provide function to handle transaction restarts Jan Kara
2019-11-05 16:44 ` [PATCH 11/25] ext4, jbd2: Provide accessor function for handle credits Jan Kara
2019-11-05 16:44 ` [PATCH 12/25] ocfs2: Use accessor function for h_buffer_credits Jan Kara
2019-11-05 16:44 ` [PATCH 13/25] jbd2: Fix statistics for the number of logged blocks Jan Kara
2019-11-05 16:44 ` [PATCH 14/25] jbd2: Reorganize jbd2_journal_stop() Jan Kara
2019-11-05 16:44 ` [PATCH 15/25] jbd2: Drop pointless check from jbd2_journal_stop() Jan Kara
2019-11-05 16:44 ` [PATCH 16/25] jbd2: Drop pointless wakeup " Jan Kara
2019-11-05 16:44 ` Jan Kara [this message]
2019-11-05 16:44 ` [PATCH 18/25] jbd2: Account descriptor blocks into t_outstanding_credits Jan Kara
2019-11-05 16:44 ` [PATCH 19/25] jbd2: Drop jbd2_space_needed() Jan Kara
2019-11-05 16:44 ` [PATCH 20/25] jbd2: Reserve space for revoke descriptor blocks Jan Kara
2019-11-15 7:52 ` Eric Biggers
2019-11-15 10:02 ` Jan Kara
2019-11-15 14:20 ` Theodore Y. Ts'o
2019-11-15 17:10 ` Eric Biggers
2019-11-05 16:44 ` [PATCH 21/25] jbd2: Rename h_buffer_credits to h_total_credits Jan Kara
2019-11-05 16:44 ` [PATCH 22/25] jbd2: Make credit checking more strict Jan Kara
2019-11-05 16:44 ` [PATCH 23/25] ext4: Reserve revoke credits for freed blocks Jan Kara
2019-11-05 16:44 ` [PATCH 24/25] jbd2: Provide trace event for handle restarts Jan Kara
2019-11-05 16:44 ` [PATCH 25/25] jbd2: Fine tune estimate of necessary descriptor blocks Jan Kara
2019-11-05 21:04 ` [PATCH 0/25 v3] ext4: Fix transaction overflow due to revoke descriptors Theodore Y. Ts'o
[not found] ` <20191112220614.GA11089@mit.edu>
[not found] ` <20191113094545.GC6367@quack2.suse.cz>
2019-11-14 5:26 ` [PATCH 0/19 " Theodore Y. Ts'o
2019-11-14 8:49 ` Jan Kara
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