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authorHani Benhabiles <kroosec@gmail.com>2014-06-06 23:38:30 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2014-06-07 01:08:18 +0200
commit04cfac4e40b2b5dbaf8c0fc625878388a98bb9c6 (patch)
treebead85900cf46216b7f0ccdaaf2e0d43d73f61f9 /drivers/block
parentmm: convert some level-less printks to pr_* (diff)
downloadlinux-04cfac4e40b2b5dbaf8c0fc625878388a98bb9c6.tar.xz
linux-04cfac4e40b2b5dbaf8c0fc625878388a98bb9c6.zip
nbd: zero from and len fields in NBD_CMD_DISCONNECT.
Len field is already set to zero, but not the from field which is sent as 0xfffffffffffffe00. This makes no sense, and may cause confuse server implementations doing sanity checks (qemu-nbd is an example.) Signed-off-by: Hani Benhabiles <hani@linux.com> Cc: Paul Clements <paul.clements@us.sios.com> Cc: Paul Clements <Paul.Clements@steeleye.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/block')
-rw-r--r--drivers/block/nbd.c7
1 files changed, 2 insertions, 5 deletions
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 56a027d6115e..fb31b8ee4372 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -243,14 +243,11 @@ static int nbd_send_req(struct nbd_device *nbd, struct request *req)
struct nbd_request request;
unsigned long size = blk_rq_bytes(req);
+ memset(&request, 0, sizeof(request));
request.magic = htonl(NBD_REQUEST_MAGIC);
request.type = htonl(nbd_cmd(req));
- if (nbd_cmd(req) == NBD_CMD_FLUSH) {
- /* Other values are reserved for FLUSH requests. */
- request.from = 0;
- request.len = 0;
- } else {
+ if (nbd_cmd(req) != NBD_CMD_FLUSH && nbd_cmd(req) != NBD_CMD_DISC) {
request.from = cpu_to_be64((u64)blk_rq_pos(req) << 9);
request.len = htonl(size);
}