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authorAndy Grover <agrover@redhat.com>2011-07-08 17:04:53 -0700
committerNicholas Bellinger <nab@linux-iscsi.org>2011-07-22 09:37:48 +0000
commitd0229ae3fed59b4009e33f836d9ad4e312294d46 (patch)
tree148f60e1db4efa563d3f4ee5e7bc735358b57a13 /include/target
parent05d1c7c0d0db4cc25548d9aadebb416888a82327 (diff)
downloadlwn-d0229ae3fed59b4009e33f836d9ad4e312294d46.tar.gz
lwn-d0229ae3fed59b4009e33f836d9ad4e312294d46.zip
target: Enforce 1 page max for control cdb buffer sizes
Due to all cdbs' data buffers being referenced by scatterlists, buffers of more than a page are not contiguous. Instead of handling this in all control command handlers, we may be able to get away with just limiting control cdb data buffers to one page. The only control CDBs we handle that have potentially large data buffers are REPORT LUNS and UNMAP, so if we didn't want to live with this limitation, they would need to be modified to walk the pages in the data buffer's sgl. Signed-off-by: Andy Grover <agrover@redhat.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'include/target')
-rw-r--r--include/target/target_core_base.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h
index f67ca98394d3..bb9ef9f715a3 100644
--- a/include/target/target_core_base.h
+++ b/include/target/target_core_base.h
@@ -15,6 +15,7 @@
/* Used by transport_generic_allocate_iovecs() */
#define TRANSPORT_IOV_DATA_BUFFER 5
/* Maximum Number of LUNs per Target Portal Group */
+/* Don't raise above 511 or REPORT_LUNS needs to handle >1 page */
#define TRANSPORT_MAX_LUNS_PER_TPG 256
/*
* By default we use 32-byte CDBs in TCM Core and subsystem plugin code.