Date: 15 Nov 2002 22:11:17 +0300 From: "Vladimir B. " Grebenschikov <vova@sw.ru> To: fs@freebsd.org Subject: Question about not locked vnode in VOP_RENAME Message-ID: <1037387476.1037.6.camel@vbook>
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Hi ppl
Question about
int
VOP_RENAME(struct vnode *fdvp, struct vnode *fvp,
struct componentname *fcnp, struct vnode *tdvp,
struct vnode *tvp, struct componentname *tcnp);
It gets fdvp unlocked. Why it is differ from other similar VOPs.
What will happens if between VOP_LOOKUP and VOP_RENAME
another VOP_LOOKUP will happens, say for for file removal in same
directory ?
Second lookup can destroy in-inode data (for ufs) saved by first lookup.
It is seems that panics
http://spitfire.velocet.net/pipermail/freebsd-stable/2002-January/025074.html
http://docs.freebsd.org/mail/archive/1998/freebsd-current/19980913.freebsd-current.html
are because this race.
--
Vladimir B. Grebenschikov <vova@sw.ru>
SWsoft Inc.
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