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authorMartin Wilck <mwilck@suse.com>2017-07-14 00:25:31 +0200
committerJens Axboe <axboe@kernel.dk>2017-07-20 16:41:56 +0200
commit42de82a8b544fa55670feef7d6f85085fba48fc0 (patch)
tree8601760e3887a31bf1b84258a25ce02352c3b357
parentnvmet: preserve controller serial number between reboots (diff)
downloadlinux-42de82a8b544fa55670feef7d6f85085fba48fc0.tar.xz
linux-42de82a8b544fa55670feef7d6f85085fba48fc0.zip
nvmet: don't report 0-bytes in serial number
The NVME standard mandates that the SN, MN, and FR fields of the Identify Controller Data Structure be "ASCII strings". That means that they may not contain 0-bytes, not even string terminators. Signed-off-by: Martin Wilck <mwilck@suse.com> Reviewed-by: Hannes Reinecke <hare@suse.de> [hch: fixed for the move of the serial field, updated description] Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
-rw-r--r--drivers/nvme/target/admin-cmd.c16
1 files changed, 14 insertions, 2 deletions
diff --git a/drivers/nvme/target/admin-cmd.c b/drivers/nvme/target/admin-cmd.c
index f7ba006d6a65..2d7a98ab53fb 100644
--- a/drivers/nvme/target/admin-cmd.c
+++ b/drivers/nvme/target/admin-cmd.c
@@ -168,11 +168,21 @@ out:
nvmet_req_complete(req, status);
}
+static void copy_and_pad(char *dst, int dst_len, const char *src, int src_len)
+{
+ int len = min(src_len, dst_len);
+
+ memcpy(dst, src, len);
+ if (dst_len > len)
+ memset(dst + len, ' ', dst_len - len);
+}
+
static void nvmet_execute_identify_ctrl(struct nvmet_req *req)
{
struct nvmet_ctrl *ctrl = req->sq->ctrl;
struct nvme_id_ctrl *id;
u16 status = 0;
+ const char model[] = "Linux";
id = kzalloc(sizeof(*id), GFP_KERNEL);
if (!id) {
@@ -184,8 +194,10 @@ static void nvmet_execute_identify_ctrl(struct nvmet_req *req)
id->vid = 0;
id->ssvid = 0;
- memset(id->sn, ' ', sizeof(id->sn));
- snprintf(id->sn, sizeof(id->sn), "%llx", ctrl->subsys->serial);
+ bin2hex(id->sn, &ctrl->subsys->serial,
+ min(sizeof(ctrl->subsys->serial), sizeof(id->sn) / 2));
+ copy_and_pad(id->mn, sizeof(id->mn), model, sizeof(model) - 1);
+ copy_and_pad(id->fr, sizeof(id->fr), UTS_RELEASE, strlen(UTS_RELEASE));
memset(id->mn, ' ', sizeof(id->mn));
strncpy((char *)id->mn, "Linux", sizeof(id->mn));