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authorLinus Torvalds <torvalds@linux-foundation.org>2021-11-01 10:12:44 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2021-11-01 10:12:44 -0700
commit71ae42629e65edab618651c8ff9c88e1edd717aa (patch)
tree9fd7ef35892c723d90c66da3d0f0f5acb9f18ee3 /drivers/scsi/sd.c
parent737f1cd8a8e80fe3243662f04d4d66829facc71a (diff)
parent0bf6d96cb8294094ce1e44cbe8cf65b0899d0a3a (diff)
Merge tag 'for-5.16/passthrough-flag-2021-10-29' of git://git.kernel.dk/linux-block
Pull QUEUE_FLAG_SCSI_PASSTHROUGH removal from Jens Axboe: "This contains a series leading to the removal of the QUEUE_FLAG_SCSI_PASSTHROUGH queue flag" * tag 'for-5.16/passthrough-flag-2021-10-29' of git://git.kernel.dk/linux-block: block: remove blk_{get,put}_request block: remove QUEUE_FLAG_SCSI_PASSTHROUGH block: remove the initialize_rq_fn blk_mq_ops method scsi: add a scsi_alloc_request helper bsg-lib: initialize the bsg_job in bsg_transport_sg_io_fn nfsd/blocklayout: use ->get_unique_id instead of sending SCSI commands sd: implement ->get_unique_id block: add a ->get_unique_id method
Diffstat (limited to 'drivers/scsi/sd.c')
-rw-r--r--drivers/scsi/sd.c39
1 files changed, 39 insertions, 0 deletions
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index f75cfc97982d..252e43d7c73f 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -1757,6 +1757,44 @@ static void sd_rescan(struct device *dev)
sd_revalidate_disk(sdkp->disk);
}
+static int sd_get_unique_id(struct gendisk *disk, u8 id[16],
+ enum blk_unique_id type)
+{
+ struct scsi_device *sdev = scsi_disk(disk)->device;
+ const struct scsi_vpd *vpd;
+ const unsigned char *d;
+ int ret = -ENXIO, len;
+
+ rcu_read_lock();
+ vpd = rcu_dereference(sdev->vpd_pg83);
+ if (!vpd)
+ goto out_unlock;
+
+ ret = -EINVAL;
+ for (d = vpd->data + 4; d < vpd->data + vpd->len; d += d[3] + 4) {
+ /* we only care about designators with LU association */
+ if (((d[1] >> 4) & 0x3) != 0x00)
+ continue;
+ if ((d[1] & 0xf) != type)
+ continue;
+
+ /*
+ * Only exit early if a 16-byte descriptor was found. Otherwise
+ * keep looking as one with more entropy might still show up.
+ */
+ len = d[3];
+ if (len != 8 && len != 12 && len != 16)
+ continue;
+ ret = len;
+ memcpy(id, d + 4, len);
+ if (len == 16)
+ break;
+ }
+out_unlock:
+ rcu_read_unlock();
+ return ret;
+}
+
static char sd_pr_type(enum pr_type type)
{
switch (type) {
@@ -1861,6 +1899,7 @@ static const struct block_device_operations sd_fops = {
.check_events = sd_check_events,
.unlock_native_capacity = sd_unlock_native_capacity,
.report_zones = sd_zbc_report_zones,
+ .get_unique_id = sd_get_unique_id,
.pr_ops = &sd_pr_ops,
};