From 2a64f80ee3ab47dc0114e077ea27903c97882138 Mon Sep 17 00:00:00 2001 From: Jan Kara Date: Wed, 23 Nov 2016 13:47:57 +0100 Subject: ocfs2: Protect periodic quota syncing with s_umount semaphore New quota locking rules will require s_umount semaphore for all quota scanning functions. Add is for periodic quota syncing. Tested-by: Eric Ren Signed-off-by: Jan Kara --- fs/ocfs2/quota_global.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) (limited to 'fs/ocfs2/quota_global.c') diff --git a/fs/ocfs2/quota_global.c b/fs/ocfs2/quota_global.c index 87e577a49b0d..cec495a921e3 100644 --- a/fs/ocfs2/quota_global.c +++ b/fs/ocfs2/quota_global.c @@ -634,7 +634,15 @@ static void qsync_work_fn(struct work_struct *work) dqi_sync_work.work); struct super_block *sb = oinfo->dqi_gqinode->i_sb; - dquot_scan_active(sb, ocfs2_sync_dquot_helper, oinfo->dqi_type); + /* + * We have to be careful here not to deadlock on s_umount as umount + * disabling quotas may be in progress and it waits for this work to + * complete. If trylock fails, we'll do the sync next time... + */ + if (down_read_trylock(&sb->s_umount)) { + dquot_scan_active(sb, ocfs2_sync_dquot_helper, oinfo->dqi_type); + up_read(&sb->s_umount); + } schedule_delayed_work(&oinfo->dqi_sync_work, msecs_to_jiffies(oinfo->dqi_syncms)); } -- cgit v1.2.3-58-ga151