Add pbgetbo()/pbrelbo() lighter weight versions of pbgetvp()/pbrelvp().
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=137725
@ -519,7 +519,9 @@ void vunmapbuf(struct buf *);
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void relpbuf(struct buf *, int *);
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void brelvp(struct buf *);
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void bgetvp(struct vnode *, struct buf *);
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void pbgetbo(struct bufobj *bo, struct buf *bp);
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void pbgetvp(struct vnode *, struct buf *);
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void pbrelbo(struct buf *);
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void pbrelvp(struct buf *);
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int allocbuf(struct buf *bp, int size);
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void reassignbuf(struct buf *);
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@ -441,6 +441,24 @@ pbgetvp(struct vnode *vp, struct buf *bp)
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bp->b_bufobj = &vp->v_bufobj;
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}
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/*
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* Associate a p-buffer with a vnode.
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*
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* Also sets B_PAGING flag to indicate that vnode is not fully associated
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* with the buffer. i.e. the bp has not been linked into the vnode or
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* ref-counted.
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*/
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void
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pbgetbo(struct bufobj *bo, struct buf *bp)
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{
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KASSERT(bp->b_vp == NULL, ("pbgetbo: not free (vnode)"));
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KASSERT(bp->b_bufobj == NULL, ("pbgetbo: not free (bufobj)"));
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bp->b_flags |= B_PAGING;
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bp->b_bufobj = bo;
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}
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/*
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* Disassociate a p-buffer from a vnode.
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*/
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@ -465,3 +483,27 @@ pbrelvp(struct buf *bp)
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bp->b_bufobj = NULL;
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bp->b_flags &= ~B_PAGING;
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}
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/*
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* Disassociate a p-buffer from a bufobj.
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*/
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void
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pbrelbo(struct buf *bp)
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{
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KASSERT(bp->b_vp == NULL, ("pbrelbo: vnode"));
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KASSERT(bp->b_bufobj != NULL, ("pbrelbo: NULL bufobj"));
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/* XXX REMOVE ME */
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BO_LOCK(bp->b_bufobj);
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if (TAILQ_NEXT(bp, b_bobufs) != NULL) {
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panic(
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"relpbuf(): b_vp was probably reassignbuf()d %p %x",
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bp,
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(int)bp->b_flags
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);
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}
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BO_UNLOCK(bp->b_bufobj);
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bp->b_bufobj = NULL;
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bp->b_flags &= ~B_PAGING;
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}
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