The patch below does not apply to the 3.9-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From 3a96d5cd7bdce45d5dded75c3a62d4fb98050280 Mon Sep 17 00:00:00 2001
From: Josh Durgin <josh.durgin@xxxxxxxxxxx>
Date: Wed, 12 Jun 2013 19:15:06 -0700
Subject: [PATCH] rbd: use the correct length for format 2 object names
Format 2 objects use 16 characters for the object name suffix to be
able to express the full 64-bit range of object numbers. Format 1
images only use 12 characters for this. Using 12-character names for
format 2 caused userspace and kernel rbd clients to read differently
named objects, which made an image written by one client look empty to
the other client.
CC: stable@xxxxxxxxxxxxxxx # 3.9+
Reported-by: Chris Dunlop <chris@xxxxxxxxxxxx>
Signed-off-by: Josh Durgin <josh.durgin@xxxxxxxxxxx>
Reviewed-by: Sage Weil <sage@xxxxxxxxxxx>
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 3a897a5..cc7c60e 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -1038,12 +1038,16 @@ static const char *rbd_segment_name(struct rbd_device *rbd_dev, u64 offset)
char *name;
u64 segment;
int ret;
+ char *name_format;
name = kmem_cache_alloc(rbd_segment_name_cache, GFP_NOIO);
if (!name)
return NULL;
segment = offset >> rbd_dev->header.obj_order;
- ret = snprintf(name, MAX_OBJ_NAME_SIZE + 1, "%s.%012llx",
+ name_format = "%s.%012llx";
+ if (rbd_dev->image_format == 2)
+ name_format = "%s.%016llx";
+ ret = snprintf(name, MAX_OBJ_NAME_SIZE + 1, name_format,
rbd_dev->header.object_prefix, segment);
if (ret < 0 || ret > MAX_OBJ_NAME_SIZE) {
pr_err("error formatting segment name for #%llu (%d)\n",
--
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