vfs: refactor _vn_lock
Stop testing for LK_RETRY and error multiple times. Also postpone the VI_DOOMED until after LK_RETRY was seen as it reads from the vnode. No functional changes.
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parent
21dff1801f
commit
1091fb52c1
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=312600
@ -1539,27 +1539,24 @@ _vn_lock(struct vnode *vp, int flags, char *file, int line)
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VNASSERT((flags & LK_TYPE_MASK) != 0, vp,
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("vn_lock called with no locktype."));
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do {
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#ifdef DEBUG_VFS_LOCKS
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KASSERT(vp->v_holdcnt != 0,
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("vn_lock %p: zero hold count", vp));
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#endif
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retry:
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error = VOP_LOCK1(vp, flags, file, line);
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flags &= ~LK_INTERLOCK; /* Interlock is always dropped. */
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KASSERT((flags & LK_RETRY) == 0 || error == 0,
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("LK_RETRY set with incompatible flags (0x%x) or an error occurred (%d)",
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flags, error));
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/*
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* Callers specify LK_RETRY if they wish to get dead vnodes.
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* If RETRY is not set, we return ENOENT instead.
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*/
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if (error == 0 && vp->v_iflag & VI_DOOMED &&
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(flags & LK_RETRY) == 0) {
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if (flags & LK_RETRY) {
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if ((error != 0))
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goto retry;
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if ((vp->v_iflag & VI_DOOMED)) {
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VOP_UNLOCK(vp, 0);
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error = ENOENT;
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break;
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}
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} while (flags & LK_RETRY && error != 0);
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}
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return (error);
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}
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