Jiaying Zhang d01730d74d quota: Fix possible deadlock during parallel quotaon and quotaoff ... The following test script triggers a deadlock on ext2 filesystem: while true; do quotaon /dev/hda >&/dev/null; usleep $RANDOM; done & while true; do quotaoff /dev/hda >&/dev/null; usleep $RANDOM; done & I found there is a potential deadlock between quotaon and quotaoff (or quotasync). Basically, all of quotactl operations need to be protected by dqonoff_mutex. vfs_quota_off and vfs_quota_sync also call sb->s_op->quota_write that needs to grab the i_mutex of the quota file. But in vfs_quota_on_inode (called from quotaon operation), the current code tries to grab the i_mutex of the quota file first before getting quonoff_mutex. Reverse the order in which we take locks in vfs_quota_on_inode(). Jan Kara: Changed changelog to be more readable, made lockdep happy with I_MUTEX_QUOTA. Signed-off-by: Jiaying Zhang <jiayingz@google.com> Signed-off-by: Jan Kara <jack@suse.cz>		2009-07-07 18:15:21 +02:00
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dquot.c	quota: Fix possible deadlock during parallel quotaon and quotaoff	2009-07-07 18:15:21 +02:00
Kconfig
Makefile	quota: remove obsolete comments in fs/quota/Makefile	2009-04-27 16:49:52 +02:00
quota_tree.c
quota_tree.h
quota_v1.c
quota_v2.c
quota.c	quota: cleanup dquota sync functions (version 4)	2009-06-11 21:36:04 -04:00
quotaio_v1.h
quotaio_v2.h