From: Jan Kara Date: Fri, 25 Jul 2008 08:46:49 +0000 (-0700) Subject: quota: fix possible infinite loop in quota code X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=b48d380541f634663b71766005838edbb7261685;p=GitHub%2Fmt8127%2Fandroid_kernel_alcatel_ttab.git quota: fix possible infinite loop in quota code When quota structure is going to be dropped and it is dirty, quota code tries to write it. If the write fails for some reason (e. g. transaction cannot be started because the journal is aborted), we try writing again and again and again... Fix the problem by clearing the dirty bit even if the write failed. (akpm: for 2.6.27, 2.6.26.x and 2.6.25.x) Signed-off-by: Jan Kara Reviewed-by: dingdinghua Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/fs/dquot.c b/fs/dquot.c index 5ac77da19959..ad88cf6fcbaf 100644 --- a/fs/dquot.c +++ b/fs/dquot.c @@ -562,6 +562,8 @@ static struct shrinker dqcache_shrinker = { */ static void dqput(struct dquot *dquot) { + int ret; + if (!dquot) return; #ifdef __DQUOT_PARANOIA @@ -594,7 +596,19 @@ we_slept: if (test_bit(DQ_ACTIVE_B, &dquot->dq_flags) && dquot_dirty(dquot)) { spin_unlock(&dq_list_lock); /* Commit dquot before releasing */ - dquot->dq_sb->dq_op->write_dquot(dquot); + ret = dquot->dq_sb->dq_op->write_dquot(dquot); + if (ret < 0) { + printk(KERN_ERR "VFS: cannot write quota structure on " + "device %s (error %d). Quota may get out of " + "sync!\n", dquot->dq_sb->s_id, ret); + /* + * We clear dirty bit anyway, so that we avoid + * infinite loop here + */ + spin_lock(&dq_list_lock); + clear_dquot_dirty(dquot); + spin_unlock(&dq_list_lock); + } goto we_slept; } /* Clear flag in case dquot was inactive (something bad happened) */