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Subject: [PATCH] virtio-blk: clarify descriptor-segment relation

Regarding the relation between data descriptors and segments, the
commit that added discard and write zeroes to the spec, stated that
the idea is "using 16 Bytes payload to support 1 descriptor" (not, for
example, 32 bytes). There wasn't any mention in the spec about one data
descriptor corresponding to exactly one segment. Added this constraint
to block documentation.

Signed-off-by: Laura Loghin <lauralg@amazon.com>
 content.tex | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/content.tex b/content.tex
index 620c0e2..6393b68 100644
--- a/content.tex
+++ b/content.tex
@@ -4599,8 +4599,9 @@ \subsection{Device Operation}\label{sec:Device Types / Block Device / Device Ope
 of 512 bytes).
 The \field{data} used for discard or write zeroes commands consists of one or
-more segments.  The maximum number of segments is \field{max_discard_seg} for
-discard commands and \field{max_write_zeroes_seg} for write zeroes commands.
+more segments, and one data descriptor corresponds to exactly one such segment.
+The maximum number of segments is \field{max_discard_seg} for discard commands
+and \field{max_write_zeroes_seg} for write zeroes commands.
 Each segment is of form:

Amazon Development Center (Romania) S.R.L. registered office: 27A Sf. Lazar Street, UBC5, floor 2, Iasi, Iasi County, 700045, Romania. Registered in Romania. Registration number J22/2621/2005.

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