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authorChristof Schmitt <christof.schmitt@de.ibm.com>2010-03-24 18:50:30 +0300
committerJames Bottomley <James.Bottomley@suse.de>2010-04-11 18:49:33 +0400
commit2f2eb58762b4dcddfe25c90800323765c1257eca (patch)
treef69788ac1afc0b7924a033cb82f33dbc55b6af1c /include/scsi/scsi.h
parent7794a5af67c672d44cfdbc7172a608b7542a66e3 (diff)
downloadlinux-2f2eb58762b4dcddfe25c90800323765c1257eca.tar.xz
[SCSI] Allow FC LLD to fast-fail scsi eh by introducing new eh return
If the scsi eh is running and then a FC LLD calls fc_remote_port_delete, the SCSI commands sent from the eh will fail. To prevent this, a FC LLD can call fc_block_scsi_eh from the eh callback, blocking the eh thread until the dev_loss_tmo fires or the remote port is available again. If (e.g. for a multipathing setup) the dev_loss_tmo is set to a very large value, thus preventing the scsi device removal , the scsi eh can block for a long time. For multipathing, the fast_io_fail_tmo is then set to a low value to detect path problems sooner. This patch introduces a new return code FAST_IO_FAIL. The function fc_block_scsi_eh now returns FAST_IO_FAIL when the fast_io_fail_tmo fires. This indicates that the LLD terminated all pending I/O requests and there are no more pending SCSI commands for the scsi eh to wait for. This return code can be passed back to the scsi eh to stop the escalation and finish the recovery process for this device. Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Diffstat (limited to 'include/scsi/scsi.h')
-rw-r--r--include/scsi/scsi.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/scsi/scsi.h b/include/scsi/scsi.h
index 8b4deca996ad..832f41f37385 100644
--- a/include/scsi/scsi.h
+++ b/include/scsi/scsi.h
@@ -423,6 +423,7 @@ static inline int scsi_is_wlun(unsigned int lun)
#define ADD_TO_MLQUEUE 0x2006
#define TIMEOUT_ERROR 0x2007
#define SCSI_RETURN_NOT_HANDLED 0x2008
+#define FAST_IO_FAIL 0x2009
/*
* Midlevel queue return values.