When we have space in the extent tree leaf node we should be able to
insert the extent with much less journal credits. The code was doing
proper calculation but missed a return statement.

Reported-by:Andreas Dilger <adilger@sun.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
---
fs/ext4/extents.c | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index f9ab60f..3e8889f 100644
--- a/fs/ext4/extents.c
...

It looks like there may be some problem with the underlying device?
I posted a program here a few months ago called "ll_ver_dev" which
can quickly (or slowly) verify that writes and reads to different
offsets in a block device return consistent data. The quick version
will detect such problems as 32-bit overflows, but if you are having
strange problems you might need to run the full version.

You could also try running with a filesystem just under 16TB and

That's because the journal is not bein...