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gluster: Abort on AIO completion failure 

Currently if gluster AIO callback thread fails to notify the QEMU thread about
AIO completion, we try graceful recovery by marking the disk drive as
inaccessible. This error recovery code is race-prone as found by Asias and
Stefan. However as found out by Paolo, this kind of error is impossible and
hence simplify the code that handles this error recovery.

Signed-off-by: Bharata B Rao <bharata@linux.vnet.ibm.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Bharata B Rao 2013-08-27 13:45:41 +05:30 committed by Kevin Wolf
parent e5b1d99f55
commit 9faa574f7d
1 changed files with 2 additions and 13 deletions
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15
block/gluster.c
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@ -427,20 +427,9 @@ static void gluster_finish_aiocb(struct glfs_fd *fd, ssize_t ret, void *arg)
/*
* Gluster AIO callback thread failed to notify the waiting
* QEMU thread about IO completion.
*
* Complete this IO request and make the disk inaccessible for
* subsequent reads and writes.
*/
error_report("Gluster failed to notify QEMU about IO completion");
qemu_mutex_lock_iothread(); /* We are in gluster thread context */
acb->common.cb(acb->common.opaque, -EIO);
qemu_aio_release(acb);
close(s->fds[GLUSTER_FD_READ]);
close(s->fds[GLUSTER_FD_WRITE]);
qemu_aio_set_fd_handler(s->fds[GLUSTER_FD_READ], NULL, NULL, NULL);
bs->drv = NULL; /* Make the disk inaccessible */
qemu_mutex_unlock_iothread();
error_report("Gluster AIO completion failed: %s", strerror(errno));
abort();
}
}