On Fri, Oct 26 2007, Sebastian Siewior wrote:
> * Jens Axboe | 2007-10-26 11:32:42 [+0200]:
>
> >On Fri, Oct 26 2007, Jens Axboe wrote:
> >> >
> >> > I hope this was usefull. Now, I'm going to rebuild my raid now....
> >> >
> >> Thanks a lot, a full report on this issue. Will get this fixed up asap.
> No problem, thanks for working on that :)
>
> >
> >Does this work?
> >
> >diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
> >index 61fdaf0..cf47fcb 100644
> >--- a/drivers/scsi/scsi_lib.c
> >+++ b/drivers/scsi/scsi_lib.c
> >@@ -1115,6 +1115,8 @@ static int scsi_init_io(struct scsi_cmnd *cmd)
> > * kmapping pages)
> > */
> > cmd->use_sg = req->nr_phys_segments;
> >+ if (!cmd->use_sg)
> >+ return 0;
> >
> > /*
> > * If sg table allocation fails, requeue request later.
> >@@ -1191,7 +1193,7 @@ int scsi_setup_blk_pc_cmnd(struct scsi_device *sdev,
> >struct request *req)
> > if (req->bio) {
> > int ret;
> >
> >- BUG_ON(!req->nr_phys_segments);
> >+ BUG_ON(!req->nr_phys_segments && req->bio->bi_size);
> >
> > ret = scsi_init_io(cmd);
> > if (unlikely(ret))
> >
>
> Nope. I get [1] on manual umount and [2] on system reboot. This is
> 24-rc1 with this patch on top.
>
> [1] http://download.breakpoint.cc/bug/bug_rc1_patch_manual.jpeg 163 KiB
> [2] http://download.breakpoint.cc/bug/bug_rc1_patch_reboot.jpeg 171 KiB
Ah, second BUG() for same issue. Try this one. This?
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 61fdaf0..57fde7b 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -1115,6 +1115,8 @@ static int scsi_init_io(struct scsi_cmnd *cmd)
* kmapping pages)
*/
cmd->use_sg = req->nr_phys_segments;
+ if (!cmd->use_sg)
+ return 0;
/*
* If sg table allocation fails, requeue request later.
@@ -1191,7 +1193,7 @@ int scsi_setup_blk_pc_cmnd(struct scsi_device *sdev,
struct request *req)
if (req->bio) {
int ret;
- BUG_ON(!req->nr_phys_segments);
+ BUG_ON(!req->nr_phys_segments && req->bio->bi_size);
ret = scsi_init_io(cmd);
if (unlikely(ret))
@@ -1236,9 +1238,10 @@ int scsi_setup_fs_cmnd(struct scsi_device *sdev, struct
request *req)
if (ret != BLKPREP_OK)
return ret;
/*
- * Filesystem requests must transfer data.
+ * Filesystem requests must transfer data, unless it's an empty
+ * barrier.
*/
- BUG_ON(!req->nr_phys_segments);
+ BUG_ON(!req->nr_phys_segments && !bio_empty_barrier(req->bio));
cmd = scsi_get_cmd_from_req(sdev, req);
if (unlikely(!cmd))
--
Jens Axboe
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