Messages in this thread | | | From | hooanon05@yahoo ... | Subject | Re: [PATCH] Fix i_mutex handling in nfsd readdir. | Date | Sat, 18 Apr 2009 12:11:54 +0900 |
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David Woodhouse: > This patch fixes it by locking the directory's i_mutex again before > calling the filldir functions. The original deadlocks which commit > 14f7dd63 was designed to avoid are still avoided, because they were due > to fs-internal locking, not i_mutex. ::: > --- a/fs/namei.c > +++ b/fs/namei.c > @@ -1248,6 +1248,8 @@ struct dentry *lookup_one_len(const char *name, struct dentry *base, int len) > int err; > struct qstr this; > > + WARN_ON_ONCE(!mutex_is_locked(&base->d_inode->i_mutex)); > + > err = __lookup_one_len(name, &this, base, len);
I'd suggest this checking is done only when CONFIG_DEBUG_KERNEL (or something) is enabled. Because unconditional checking costs high for the well-reviewed lookup code.
J. R. Okajima
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