Check for mismatched vref()/vdrop()
Assert that the hold count has not fallen below the use count, a situation that would only happen when a vref() (or similar) is erroneously paired with a vdrop(). This situation has not been observed in the wild, but could be helpful for someone implementing a new filesystem. Reviewed by: kib Approved by: hrs (mentor)
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=266482
@ -2343,6 +2343,8 @@ vdropl(struct vnode *vp)
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if (vp->v_holdcnt <= 0)
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panic("vdrop: holdcnt %d", vp->v_holdcnt);
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vp->v_holdcnt--;
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VNASSERT(vp->v_holdcnt >= vp->v_usecount, vp,
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("hold count less than use count"));
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if (vp->v_holdcnt > 0) {
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VI_UNLOCK(vp);
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return;
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