needs_copy is set only in one place in do_get_write_access(), just move
the frozen buffer copying into that place and factor it out to a
separate function to make do_get_write_access() slightly more readable.
Signed-off-by: Jan Kara <jack@xxxxxxx>
---
fs/jbd2/transaction.c | 49 +++++++++++++++++++++++++------------------------
1 file changed, 25 insertions(+), 24 deletions(-)
diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c
index 5f09370c90a8..2b75f0f109be 100644
--- a/fs/jbd2/transaction.c
+++ b/fs/jbd2/transaction.c
@@ -763,6 +763,30 @@ static void warn_dirty_buffer(struct buffer_head *bh)
bdevname(bh->b_bdev, b), (unsigned long long)bh->b_blocknr);
}
+/* Call t_frozen trigger and copy buffer data into jh->b_frozen_data. */
+static void jbd2_freeze_jh_data(struct journal_head *jh)
+{
+ struct page *page;
+ int offset;
+ char *source;
+ struct buffer_head *bh = jh2bh(jh);
+
+ J_EXPECT_JH(jh, buffer_uptodate(bh), "Possible IO failure.\n");
+ page = bh->b_page;
+ offset = offset_in_page(bh->b_data);
+ source = kmap_atomic(page);
+ /* Fire data frozen trigger just before we copy the data */
+ jbd2_buffer_frozen_trigger(jh, source + offset, jh->b_triggers);
+ memcpy(jh->b_frozen_data, source + offset, bh->b_size);
+ kunmap_atomic(source);
+
+ /*
+ * Now that the frozen data is saved off, we need to store any matching
+ * triggers.
+ */
+ jh->b_frozen_triggers = jh->b_triggers;
+}
+
/*
* If the buffer is already part of the current transaction, then there
* is nothing we need to do. If it is already part of a prior
@@ -782,7 +806,6 @@ do_get_write_access(handle_t *handle, struct journal_head *jh,
journal_t *journal;
int error;
char *frozen_buffer = NULL;
- int need_copy = 0;
unsigned long start_lock, time_lock;
WARN_ON(!transaction);
@@ -940,7 +963,7 @@ repeat:
}
jh->b_frozen_data = frozen_buffer;
frozen_buffer = NULL;
- need_copy = 1;
+ jbd2_freeze_jh_data(jh);
}
jh->b_next_transaction = transaction;
}
@@ -961,28 +984,6 @@ repeat:
}
done:
- if (need_copy) {
- struct page *page;
- int offset;
- char *source;
-
- J_EXPECT_JH(jh, buffer_uptodate(jh2bh(jh)),
- "Possible IO failure.\n");
- page = jh2bh(jh)->b_page;
- offset = offset_in_page(jh2bh(jh)->b_data);
- source = kmap_atomic(page);
- /* Fire data frozen trigger just before we copy the data */
- jbd2_buffer_frozen_trigger(jh, source + offset,
- jh->b_triggers);
- memcpy(jh->b_frozen_data, source+offset, jh2bh(jh)->b_size);
- kunmap_atomic(source);
-
- /*
- * Now that the frozen data is saved off, we need to store
- * any matching triggers.
- */
- jh->b_frozen_triggers = jh->b_triggers;
- }
jbd_unlock_bh_state(bh);
/*
--
2.1.4
--
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