path: root/block/partitions
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authorDoug Anderson <>2013-10-16 13:46:57 -0700
committerLinus Torvalds <>2013-10-16 21:35:53 -0700
commit87fc0ad2ad8a15de653f4cef7760fa35e689077f (patch)
tree3c1428036452d8b7a18b9f2cac8f1caefa23cf47 /block/partitions
parentef5a22be2c525293b777ccd879a8017c41c7ed5a (diff)
block/partitions/efi.c: treat size mismatch as a warning, not an error
In commit 27a7c642174e ("partitions/efi: account for pmbr size in lba") we started treating bad sizes in lba field of the partition that has the 0xEE (GPT protective) as errors. However, we may run into these "bad sizes" in the real world if someone uses dd to copy an image from a smaller disk to a bigger disk. Since this case used to work (even without using force_gpt), keep it working and treat the size mismatch as a warning instead of an error. Reported-by: Josh Triplett <> Reported-by: Sean Paul <> Signed-off-by: Doug Anderson <> Reviewed-by: Josh Triplett <> Acked-by: Davidlohr Bueso <> Tested-by: Artem Bityutskiy <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
Diffstat (limited to 'block/partitions')
1 files changed, 6 insertions, 1 deletions
diff --git a/block/partitions/efi.c b/block/partitions/efi.c
index 1eb09ee5311b..a8287b49d062 100644
--- a/block/partitions/efi.c
+++ b/block/partitions/efi.c
@@ -222,11 +222,16 @@ check_hybrid:
* the disk size.
* Hybrid MBRs do not necessarily comply with this.
+ *
+ * Consider a bad value here to be a warning to support dd'ing
+ * an image from a smaller disk to a larger disk.
if (ret == GPT_MBR_PROTECTIVE) {
sz = le32_to_cpu(mbr->partition_record[part].size_in_lba);
if (sz != (uint32_t) total_sectors - 1 && sz != 0xFFFFFFFF)
- ret = 0;
+ pr_debug("GPT: mbr size in lba (%u) different than whole disk (%u).\n",
+ sz, min_t(uint32_t,
+ total_sectors - 1, 0xFFFFFFFF));
return ret;