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[PATCH 3/8] xfs: make the log ticket transaction id random

To: xfs@xxxxxxxxxxx
Subject: [PATCH 3/8] xfs: make the log ticket transaction id random
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Thu, 1 Apr 2010 23:41:26 +1100
In-reply-to: <1270125691-29266-1-git-send-email-david@xxxxxxxxxxxxx>
References: <1270125691-29266-1-git-send-email-david@xxxxxxxxxxxxx>
From: Dave Chinner <dchinner@xxxxxxxxxx>

The transaction ID that is written to the log for a transaction is
currently set by taking the lower 32 bits of the memory address of
the ticket structure.  This is not guaranteed to be unique as
tickets comes from a slab and slots can be reallocated immediately
after being freed. As a result, there is no guarantee of uniqueness
in the ticket ID value.

Fix this by assigning a random number to the ticket ID field so that
it is extremely unlikely that duplicates will occur and remove the
possibility of transactions being mixed up during recovery due to
duplicate IDs.

Signed-off-by: Dave Chinner <dchinner@xxxxxxxxxx>
 fs/xfs/xfs_log.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c
index 9edbd67..77593c2 100644
--- a/fs/xfs/xfs_log.c
+++ b/fs/xfs/xfs_log.c
@@ -3417,7 +3417,7 @@ xlog_ticket_alloc(
        tic->t_curr_res         = unit_bytes;
        tic->t_cnt              = cnt;
        tic->t_ocnt             = cnt;
-       tic->t_tid              = (xlog_tid_t)((__psint_t)tic & 0xffffffff);
+       tic->t_tid              = random32();
        tic->t_clientid         = client;
        tic->t_flags            = XLOG_TIC_INITED;
        tic->t_trans_type       = 0;

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