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iscsi-scst: Handle data buffers with non-zero offset correctly (merge r5683 from trunk)

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git-svn-id: http://svn.code.sf.net/p/scst/svn/branches/3.0.x@5687 d57e44dd-8a1f-0410-8b47-8ef2f437770f
This commit is contained in:
Bart Van Assche
2014-07-20 05:59:31 +00:00
parent 7d7bf8bb02
commit 91c8d27db8
2 changed files with 13 additions and 6 deletions
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iscsi-scst/kernel/nthread.c
+10 -2
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@@ -1396,16 +1396,24 @@ retry:
sg_size = size;
if (sg != write_cmnd->rsp_sg) {
/*
* Data scatterlist. It is assumed that only the first element
* has a non-zero offset and that all elements except the
* first and the last have a length that is equal to
* PAGE_SIZE.
*/
offset = conn->write_offset + sg[0].offset;
idx = offset >> PAGE_SHIFT;
if (offset + sg[0].offset >= PAGE_SIZE)
offset += sg[0].offset;
offset &= ~PAGE_MASK;
length = min(size, (int)PAGE_SIZE - offset);
TRACE_WRITE("write_offset %d, sg_size %d, idx %d, offset %d, "
"length %d", conn->write_offset, sg_size, idx, offset,
length);
} else {
/*
* Response scatterlist. No assumptions are made about the
* offset nor about the length of scatterlist elements.
*/
idx = 0;
offset = conn->write_offset;
while (offset >= sg[idx].length) {