On 05/15/2012 12:12 PM, Edward Shishkin wrote:
On 05/15/2012 12:55 AM, Sandro Souza wrote:
Hello my friends.
Hello.
I made a new custom distro based on debian squeeze, but with 2.6.39
kernel, patched with reiser4
(http://downloads.sourceforge.net/project/reiser4/reiser4-for-linux-2.6/reiser4-for-2.6.39-1.patch.gz?r=http%3A%2F%2Fsourceforge.net%2Fprojects%2Freiser4%2Ffiles%2Freiser4-for-linux-2.6%2F&ts=1337035240&use_mirror=ufpr).
Trying to copy a folder from a reiser3 partition to a reiser4
partition, I got error messages.
Testing my custom kernel with "preemption model" in "Preemptible
Kernel", I got these messages:
[ 286.945598] ------------[ cut here ]------------
[ 286.945609] kernel BUG at fs/reiser4/block_alloc.c:151!
[ 286.945617] invalid opcode: 0000 [#1] PREEMPT SMP
[ 286.945626] last sysfs file:
[...]
[ 286.945676]
[ 286.945683] Pid: 2433, comm: nautilus Not tainted 2.6.39-reiser4 #1
innotek GmbH VirtualBox
[ 286.945691] RIP: 0010:[<ffffffff81178fae>] [<ffffffff81178fae>]
grabbed2flush_reserved_nolock+0x33/0x7b
It seems we forget to reserve space somewhere in write_end_cryptcompress().
Reiser4 uses technique of "soft ENOSPC": since it is impossible to
estimate precisely amount of disk space that will be spent by any
operation, every thread reserves needed amount of space with store,
so that surplus will be freed at commit time.
It seems we forget to reserve space somewhere in
write_end_cryptcompress() for some needs, so that all reserved space
is exhausted and update_sd(), which wants 1 reserved block encounters
a zeroed counter of reserved blocks.
BTW we don't reserve space exactly for update_sd() (one block should be
reserved). Anybody care to fix this?
Thanks,
Edward.
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