1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
|
From b31df389ada54f5b2725826cd8d9a13ace960168 Mon Sep 17 00:00:00 2001
From: Roland Dreier <roland@purestorage.com>
Date: Mon, 16 Jul 2012 15:34:23 -0700
Subject: [PATCH 42/73] target: Fix reading of data length fields for UNMAP
commands
commit 1a5fa4576ec8a462313c7516b31d7453481ddbe8 upstream.
The UNMAP DATA LENGTH and UNMAP BLOCK DESCRIPTOR DATA LENGTH fields
are in the unmap descriptor (the payload transferred to our data out
buffer), not in the CDB itself. Read them from the correct place in
target_emulated_unmap.
Signed-off-by: Roland Dreier <roland@purestorage.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
[bwh: Backported to 3.2: adjust filename, context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
drivers/target/target_core_cdb.c | 6 +++---
1 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/target/target_core_cdb.c b/drivers/target/target_core_cdb.c
index 45a3ed4..b1f5cf0 100644
--- a/drivers/target/target_core_cdb.c
+++ b/drivers/target/target_core_cdb.c
@@ -1114,7 +1114,6 @@ int target_emulate_unmap(struct se_task *task)
struct se_cmd *cmd = task->task_se_cmd;
struct se_device *dev = cmd->se_dev;
unsigned char *buf, *ptr = NULL;
- unsigned char *cdb = &cmd->t_task_cdb[0];
sector_t lba;
unsigned int size = cmd->data_length, range;
int ret = 0, offset;
@@ -1130,11 +1129,12 @@ int target_emulate_unmap(struct se_task *task)
/* First UNMAP block descriptor starts at 8 byte offset */
offset = 8;
size -= 8;
- dl = get_unaligned_be16(&cdb[0]);
- bd_dl = get_unaligned_be16(&cdb[2]);
buf = transport_kmap_data_sg(cmd);
+ dl = get_unaligned_be16(&buf[0]);
+ bd_dl = get_unaligned_be16(&buf[2]);
+
ptr = &buf[offset];
pr_debug("UNMAP: Sub: %s Using dl: %hu bd_dl: %hu size: %hu"
" ptr: %p\n", dev->transport->name, dl, bd_dl, size, ptr);
--
1.7.7.6
|
