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author | NeilBrown <neilb@suse.de> | 2008-09-01 12:32:52 +1000 |
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committer | NeilBrown <neilb@suse.de> | 2008-09-01 12:32:52 +1000 |
commit | 271f5a9b8f8ae0db95de72779d115c9d0b9d3cc5 (patch) | |
tree | 814bfe03f1c5ae97da163c8f6b24a0cf67cfd783 /arch/sparc/kernel | |
parent | bef69ea0dcce574a425feb0a5aa4c63dd108b9a6 (diff) |
Remove invalidate_partition call from do_md_stop.
When stopping an md array, or just switching to read-only, we
currently call invalidate_partition while holding the mddev lock.
The main reason for this is probably to ensure all dirty buffers
are flushed (invalidate_partition calls fsync_bdev).
However if any dirty buffers are found, it will almost certainly cause
a deadlock as starting writeout will require an update to the
superblock, and performing that updates requires taking the mddev
lock - which is already held.
This deadlock can be demonstrated by running "reboot -f -n" with
a root filesystem on md/raid, and some dirty buffers in memory.
All other calls to stop an array should already happen after a flush.
The normal sequence is to stop using the array (e.g. umount) which
will cause __blkdev_put to call sync_blockdev. Then open the
array and issue the STOP_ARRAY ioctl while the buffers are all still
clean.
So this invalidate_partition is normally a no-op, except for one case
where it will cause a deadlock.
So remove it.
This patch possibly addresses the regression recored in
http://bugzilla.kernel.org/show_bug.cgi?id=11460
and
http://bugzilla.kernel.org/show_bug.cgi?id=11452
though it isn't yet clear how it ever worked.
Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'arch/sparc/kernel')
0 files changed, 0 insertions, 0 deletions