unsigned int persistent_gnts_c;
unsigned long shadow_free;
unsigned int feature_flush;
- unsigned int flush_op;
unsigned int feature_discard:1;
unsigned int feature_secdiscard:1;
unsigned int discard_granularity;
* way. (It's also a FLUSH+FUA, since it is
* guaranteed ordered WRT previous writes.)
*/
- ring_req->operation = info->flush_op;
+ switch (info->feature_flush &
+ ((REQ_FLUSH|REQ_FUA))) {
+ case REQ_FLUSH|REQ_FUA:
+ ring_req->operation =
+ BLKIF_OP_WRITE_BARRIER;
+ break;
+ case REQ_FLUSH:
+ ring_req->operation =
+ BLKIF_OP_FLUSH_DISKCACHE;
+ break;
+ default:
+ ring_req->operation = 0;
+ }
}
ring_req->u.rw.nr_segments = nseg;
}
return 0;
}
+static const char *flush_info(unsigned int feature_flush)
+{
+ switch (feature_flush & ((REQ_FLUSH | REQ_FUA))) {
+ case REQ_FLUSH|REQ_FUA:
+ return "barrier: enabled;";
+ case REQ_FLUSH:
+ return "flush diskcache: enabled;";
+ default:
+ return "barrier or flush: disabled;";
+ }
+}
static void xlvbd_flush(struct blkfront_info *info)
{
blk_queue_flush(info->rq, info->feature_flush);
- printk(KERN_INFO "blkfront: %s: %s: %s %s %s %s %s\n",
- info->gd->disk_name,
- info->flush_op == BLKIF_OP_WRITE_BARRIER ?
- "barrier" : (info->flush_op == BLKIF_OP_FLUSH_DISKCACHE ?
- "flush diskcache" : "barrier or flush"),
- info->feature_flush ? "enabled;" : "disabled;",
- "persistent grants:",
- info->feature_persistent ? "enabled;" : "disabled;",
- "indirect descriptors:",
- info->max_indirect_segments ? "enabled;" : "disabled;");
+ pr_info("blkfront: %s: %s %s %s %s %s\n",
+ info->gd->disk_name, flush_info(info->feature_flush),
+ "persistent grants:", info->feature_persistent ?
+ "enabled;" : "disabled;", "indirect descriptors:",
+ info->max_indirect_segments ? "enabled;" : "disabled;");
}
static int xen_translate_vdev(int vdevice, int *minor, unsigned int *offset)
if (error == -EOPNOTSUPP)
error = 0;
info->feature_flush = 0;
- info->flush_op = 0;
xlvbd_flush(info);
}
/* fall through */
physical_sector_size = sector_size;
info->feature_flush = 0;
- info->flush_op = 0;
err = xenbus_gather(XBT_NIL, info->xbdev->otherend,
"feature-barrier", "%d", &barrier,
*
* If there are barriers, then we use flush.
*/
- if (!err && barrier) {
+ if (!err && barrier)
info->feature_flush = REQ_FLUSH | REQ_FUA;
- info->flush_op = BLKIF_OP_WRITE_BARRIER;
- }
/*
* And if there is "feature-flush-cache" use that above
* barriers.
"feature-flush-cache", "%d", &flush,
NULL);
- if (!err && flush) {
+ if (!err && flush)
info->feature_flush = REQ_FLUSH;
- info->flush_op = BLKIF_OP_FLUSH_DISKCACHE;
- }
err = xenbus_gather(XBT_NIL, info->xbdev->otherend,
"feature-discard", "%d", &discard,