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| author | NeilBrown <neilb@suse.de> | 2013-11-14 15:16:15 +1100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-12-04 10:50:33 -0800 |
| commit | f69a26d2cff8533570ca3ef3c59f2e1174b084b1 (patch) | |
| tree | 158224fbed9c322fbb8c49f18a9d26490a323324 /drivers | |
| parent | 3ae78536556792344cad475b78aecaf66e9ab3a6 (diff) | |
| download | lwn-f69a26d2cff8533570ca3ef3c59f2e1174b084b1.tar.gz lwn-f69a26d2cff8533570ca3ef3c59f2e1174b084b1.zip | |
md: fix calculation of stacking limits on level change.
commit 02e5f5c0a0f726e66e3d8506ea1691e344277969 upstream.
The various ->run routines of md personalities assume that the 'queue'
has been initialised by the blk_set_stacking_limits() call in
md_alloc().
However when the level is changed (by level_store()) the ->run routine
for the new level is called for an array which has already had the
stacking limits modified. This can result in incorrect final
settings.
So call blk_set_stacking_limits() before ->run in level_store().
A specific consequence of this bug is that it causes
discard_granularity to be set incorrectly when reshaping a RAID4 to a
RAID0.
This is suitable for any -stable kernel since 3.3 in which
blk_set_stacking_limits() was introduced.
Reported-and-tested-by: "Baldysiak, Pawel" <pawel.baldysiak@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/md/md.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c index 7b45b5e1b31e..e63ca864b35a 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -3507,6 +3507,7 @@ level_store(struct mddev *mddev, const char *buf, size_t len) mddev->in_sync = 1; del_timer_sync(&mddev->safemode_timer); } + blk_set_stacking_limits(&mddev->queue->limits); pers->run(mddev); mddev_resume(mddev); set_bit(MD_CHANGE_DEVS, &mddev->flags); |