Dmitry 9e32784b71 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>		2010-10-28 01:30:02 +02:00
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compat.c	quota: split out compat_sys_quotactl support from quota.c	2010-03-05 00:20:25 +01:00
dquot.c	quota: fix dquot_disable vs dquot_transfer race v2	2010-10-28 01:30:02 +02:00
Kconfig	quota: Make QUOTACTL config be selected by its users	2010-10-05 12:16:37 +02:00
Makefile	quota: split out compat_sys_quotactl support from quota.c	2010-03-05 00:20:25 +01:00
netlink.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
quota.c	quota: drop remount argument to ->quota_on and ->quota_off	2010-05-24 14:09:12 +02:00
quota_tree.c	quota: Change quota error message to print out disk and function name	2010-07-21 16:05:58 +02:00
quota_tree.h	quota: Change quota error message to print out disk and function name	2010-07-21 16:05:58 +02:00
quota_v1.c	quota: Change quota error message to print out disk and function name	2010-07-21 16:05:58 +02:00
quota_v2.c	quota: Change quota error message to print out disk and function name	2010-07-21 16:05:58 +02:00
quotaio_v1.h
quotaio_v2.h	quota: Implement quota format with 64-bit space and inode limits	2009-12-10 15:02:54 +01:00