Ok my experiment doing the following (and I know launchpad will mangle
my spacing...):
diff --git a/block/blk-lib.c b/block/blk-lib.c
index 9b5b561..03ad981 100644
--- a/block/blk-lib.c
+++ b/block/blk-lib.c
@@ -283,6 +283,7 @@ int __blkdev_issue_zeroout(struct block_device *bdev,
sector_t sector,
int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
sector_t nr_sects, gfp_t gfp_mask)
{
+#if 0
if (bdev_write_same(bdev)) {
unsigned char bdn[BDEVNAME_SIZE];
@@ -293,7 +294,7 @@ int blkdev_issue_zeroout(struct block_device *bdev,
sector_t sector,
bdevname(bdev, bdn);
pr_err("%s: WRITE SAME failed. Manually zeroing.\n", bdn);
}
-
+#endif
return __blkdev_issue_zeroout(bdev, sector, nr_sects, gfp_mask);
}
EXPORT_SYMBOL(blkdev_issue_zeroout);
Forcing manual zeroout works fine, so the 'hardware' zeroout is the problem.
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https://bugs.launchpad.net/bugs/1371591
Title:
file not initialized to 0s under some conditions on VMWare
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