xen-blkback: move free persistent grants code
Move the code that frees persistent grants from the red-black tree to a function. This will make it easier for other consumers to move this to a common place. Signed-off-by: Roger Pau Monné <roger.pau@citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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@ -212,6 +212,39 @@ static struct persistent_gnt *get_persistent_gnt(struct rb_root *root,
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return NULL;
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}
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static void free_persistent_gnts(struct rb_root *root, unsigned int num)
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{
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struct gnttab_unmap_grant_ref unmap[BLKIF_MAX_SEGMENTS_PER_REQUEST];
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struct page *pages[BLKIF_MAX_SEGMENTS_PER_REQUEST];
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struct persistent_gnt *persistent_gnt;
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int ret = 0;
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int segs_to_unmap = 0;
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foreach_grant(persistent_gnt, root, node) {
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BUG_ON(persistent_gnt->handle ==
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BLKBACK_INVALID_HANDLE);
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gnttab_set_unmap_op(&unmap[segs_to_unmap],
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(unsigned long) pfn_to_kaddr(page_to_pfn(
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persistent_gnt->page)),
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GNTMAP_host_map,
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persistent_gnt->handle);
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pages[segs_to_unmap] = persistent_gnt->page;
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rb_erase(&persistent_gnt->node, root);
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kfree(persistent_gnt);
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num--;
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if (++segs_to_unmap == BLKIF_MAX_SEGMENTS_PER_REQUEST ||
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!rb_next(&persistent_gnt->node)) {
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ret = gnttab_unmap_refs(unmap, NULL, pages,
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segs_to_unmap);
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BUG_ON(ret);
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segs_to_unmap = 0;
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}
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}
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BUG_ON(num != 0);
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}
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/*
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* Retrieve from the 'pending_reqs' a free pending_req structure to be used.
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*/
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@ -358,11 +391,6 @@ int xen_blkif_schedule(void *arg)
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{
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struct xen_blkif *blkif = arg;
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struct xen_vbd *vbd = &blkif->vbd;
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struct gnttab_unmap_grant_ref unmap[BLKIF_MAX_SEGMENTS_PER_REQUEST];
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struct page *pages[BLKIF_MAX_SEGMENTS_PER_REQUEST];
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struct persistent_gnt *persistent_gnt;
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int ret = 0;
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int segs_to_unmap = 0;
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xen_blkif_get(blkif);
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@ -391,34 +419,12 @@ int xen_blkif_schedule(void *arg)
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}
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/* Free all persistent grant pages */
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if (!RB_EMPTY_ROOT(&blkif->persistent_gnts)) {
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foreach_grant(persistent_gnt, &blkif->persistent_gnts, node) {
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BUG_ON(persistent_gnt->handle ==
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BLKBACK_INVALID_HANDLE);
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gnttab_set_unmap_op(&unmap[segs_to_unmap],
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(unsigned long) pfn_to_kaddr(page_to_pfn(
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persistent_gnt->page)),
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GNTMAP_host_map,
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persistent_gnt->handle);
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if (!RB_EMPTY_ROOT(&blkif->persistent_gnts))
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free_persistent_gnts(&blkif->persistent_gnts,
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blkif->persistent_gnt_c);
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pages[segs_to_unmap] = persistent_gnt->page;
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rb_erase(&persistent_gnt->node,
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&blkif->persistent_gnts);
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kfree(persistent_gnt);
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blkif->persistent_gnt_c--;
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if (++segs_to_unmap == BLKIF_MAX_SEGMENTS_PER_REQUEST ||
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!rb_next(&persistent_gnt->node)) {
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ret = gnttab_unmap_refs(unmap, NULL, pages,
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segs_to_unmap);
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BUG_ON(ret);
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segs_to_unmap = 0;
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}
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}
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}
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BUG_ON(blkif->persistent_gnt_c != 0);
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BUG_ON(!RB_EMPTY_ROOT(&blkif->persistent_gnts));
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blkif->persistent_gnt_c = 0;
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if (log_stats)
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print_stats(blkif);
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