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authorDmitry <dmonakhov@openvz.org>2010-10-09 23:15:30 +0400
committerJan Kara <jack@suse.cz>2010-10-28 03:30:02 +0400
commit9e32784b71c2c84895016ca6ab271591669c02aa (patch)
treedb69a152de57f65666408591a06f15cb865c695f /include/sound/emux_synth.h
parenta910eefa511f9d1118effc13fba6773163502c4f (diff)
downloadlinux-9e32784b71c2c84895016ca6ab271591669c02aa.tar.xz
quota: fix dquot_disable vs dquot_transfer race v2
I've got following lockup: dquot_disable dquot_transfer ->dqget() sb_has_quota_active dqopt->flags &= ~dquot_state_flag(f, cnt) atomic_inc(dq->dq_count) ->drop_dquot_ref(sb, cnt); down_write(dqptr_sem) inode->i_dquot[cnt] = NULL ->__dquot_transfer invalidate_dquots(sb, cnt); down_write(&dqptr_sem) ->wait for dq_wait_unused inode->i_dquot = new_dquot /* wait forever */ ^^^^New quota user^^^^^^ We cannot allow new references to dquots from inodes after drop_dquot_ref() has removed them. We have to recheck quota state under dqptr_sem and before assignment, as we do it in dquot_initialize(). Signed-off-by: Dmitry Monakhov <dmonakhov@gmail.com> Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'include/sound/emux_synth.h')
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