tree e10db004cdbc4027d0046838ec9bee534a09f2c1
parent 052c28073ff26f771d44ef33952a41d18dadd255
author Artem Bityutskiy <artem.bityutskiy@linux.intel.com> 1405513349 +0300
committer Artem Bityutskiy <artem.bityutskiy@linux.intel.com> 1410180928 +0300

UBIFS: fix free log space calculation

Hu (hujianyang <hujianyang@huawei.com>) discovered an issue in the
'empty_log_bytes()' function, which calculates how many bytes are left in the
log:

"
If 'c->lhead_lnum + 1 == c->ltail_lnum' and 'c->lhead_offs == c->leb_size', 'h'
would equalent to 't' and 'empty_log_bytes()' would return 'c->log_bytes'
instead of 0.
"

At this point it is not clear what would be the consequences of this, and
whether this may lead to any problems, but this patch addresses the issue just
in case.

Cc: stable@vger.kernel.org
Tested-by: hujianyang <hujianyang@huawei.com>
Reported-by: hujianyang <hujianyang@huawei.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>