On Thu, 12 Feb 2004, Jun Kuriyama wrote: > Is this patch safe for locking? This may remove warnings below: Perhaps, but it has some style bugs. > Index: ffs_snapshot.c > =================================================================== > RCS file: /home/ncvs/src/sys/ufs/ffs/ffs_snapshot.c,v > retrieving revision 1.77 > diff -u -r1.77 ffs_snapshot.c > --- ffs_snapshot.c 4 Jan 2004 04:08:34 -0000 1.77 > +++ ffs_snapshot.c 12 Feb 2004 01:08:31 -0000 > _at__at_ -488,9 +488,10 _at__at_ > VI_LOCK(devvp); > snaphead = &devvp->v_rdev->si_snapshots; > if ((xp = TAILQ_FIRST(snaphead)) != NULL) { > - VI_LOCK(vp); > - vp->v_vnlock = ITOV(xp)->v_vnlock; > + struct lock *lkp = ITOV(xp)->v_vnlock; (1) Nested declaration. (2) Initialization in declaration. (3) No blank line after declaration. > VI_UNLOCK(devvp); > + VI_LOCK(vp); > + vp->v_vnlock = lkp; > } else { > struct lock *lkp; > However, (1) seems to be a normal style in this file. It is used here in similar code. But (2) and (3) are not used here. > _at__at_ -1793,9 +1794,10 _at__at_ > */ > VI_LOCK(devvp); > if ((xp = TAILQ_FIRST(snaphead)) != NULL) { > - VI_LOCK(vp); > - vp->v_vnlock = ITOV(xp)->v_vnlock; > + struct lock *lkp = ITOV(xp)->v_vnlock; > VI_UNLOCK(devvp); > + VI_LOCK(vp); > + vp->v_vnlock = lkp; As above. > } else { > struct lock *lkp; > As above. The lkp local is now defined nested twice, so (1) is a larger style bug than before; however, the functions are so large that the style bug is more in the other direction -- they begin with a large list of declarations and might benefit from more nested ones. Anyway, following ther nearby style is never wrong. BruceReceived on Thu Feb 12 2004 - 10:16:26 UTC
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