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/openbmc/linux/drivers/block/drbd/ |
H A D | drbd_receiver.c | b6a370ba Sat Feb 18 18:27:53 CST 2012 Philipp Reisner <philipp.reisner@linbit.com> drbd: Fix a potential write ordering issue on SyncTarget nodes
If a SyncTarget node gets a P_RS_DATA_REPLY before a P_DATA packet for the same sector, it simply submits these two IO requests.
This is be possible because on the SyncSource node, the data of the P_RS_DATA_REPLY packet was read from disk. Immediately after that a write request from upper layers came in.
The disk scheduler or even the "hardware" queues on the disk drive might reorder these writes.
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com> b6a370ba Sat Feb 18 18:27:53 CST 2012 Philipp Reisner <philipp.reisner@linbit.com> drbd: Fix a potential write ordering issue on SyncTarget nodes If a SyncTarget node gets a P_RS_DATA_REPLY before a P_DATA packet for the same sector, it simply submits these two IO requests. This is be possible because on the SyncSource node, the data of the P_RS_DATA_REPLY packet was read from disk. Immediately after that a write request from upper layers came in. The disk scheduler or even the "hardware" queues on the disk drive might reorder these writes. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
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