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Commit 2a64f80e authored by Jan Kara's avatar Jan Kara
Browse files

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: default avatarEric Ren <zren@suse.com>
Signed-off-by: default avatarJan Kara <jack@suse.cz>
parent 9d1ccbe7

fs/ocfs2/quota_global.c

+9 −1
Original line number Diff line number Diff line
@@ -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;



	/*

	 * 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));

}

fs/ocfs2/super.c

+0 −1
Original line number Diff line number Diff line
@@ -985,7 +985,6 @@ static void ocfs2_disable_quotas(struct ocfs2_super *osb) 
	for (type = 0; type < OCFS2_MAXQUOTAS; type++) {

		if (!sb_has_quota_loaded(sb, type))

			continue;

		/* Cancel periodic syncing before we grab dqonoff_mutex */

		oinfo = sb_dqinfo(sb, type)->dqi_priv;

		cancel_delayed_work_sync(&oinfo->dqi_sync_work);

		inode = igrab(sb->s_dquot.files[type]);