Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754520AbbGIUnm (ORCPT ); Thu, 9 Jul 2015 16:43:42 -0400 Received: from smtp02.citrix.com ([66.165.176.63]:58745 "EHLO SMTP02.CITRIX.COM" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753925AbbGIUnj (ORCPT ); Thu, 9 Jul 2015 16:43:39 -0400 X-IronPort-AV: E=Sophos;i="5.15,442,1432598400"; d="scan'208";a="282741496" From: Julien Grall To: CC: , , , , "Julien Grall" , Konrad Rzeszutek Wilk , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= , Boris Ostrovsky , "David Vrabel" Subject: [PATCH v2 06/20] block/xen-blkfront: Store a page rather a pfn in the grant structure Date: Thu, 9 Jul 2015 21:42:18 +0100 Message-ID: <1436474552-31789-7-git-send-email-julien.grall@citrix.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1436474552-31789-1-git-send-email-julien.grall@citrix.com> References: <1436474552-31789-1-git-send-email-julien.grall@citrix.com> MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit X-DLP: MIA2 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 6110 Lines: 165 All the usage of the field pfn are done using the same idiom: pfn_to_page(grant->pfn) This will return always the same page. Store directly the page in the grant to clean up the code. Signed-off-by: Julien Grall Cc: Konrad Rzeszutek Wilk Cc: Roger Pau Monné Cc: Boris Ostrovsky Cc: David Vrabel --- Changes in v2: - Patch added --- drivers/block/xen-blkfront.c | 37 ++++++++++++++++++------------------- 1 file changed, 18 insertions(+), 19 deletions(-) diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c index 7107d58..7b81d23 100644 --- a/drivers/block/xen-blkfront.c +++ b/drivers/block/xen-blkfront.c @@ -67,7 +67,7 @@ enum blkif_state { struct grant { grant_ref_t gref; - unsigned long pfn; + struct page *page; struct list_head node; }; @@ -219,7 +219,7 @@ static int fill_grant_buffer(struct blkfront_info *info, int num) kfree(gnt_list_entry); goto out_of_memory; } - gnt_list_entry->pfn = page_to_pfn(granted_page); + gnt_list_entry->page = granted_page; } gnt_list_entry->gref = GRANT_INVALID_REF; @@ -234,7 +234,7 @@ out_of_memory: &info->grants, node) { list_del(&gnt_list_entry->node); if (info->feature_persistent) - __free_page(pfn_to_page(gnt_list_entry->pfn)); + __free_page(gnt_list_entry->page); kfree(gnt_list_entry); i--; } @@ -243,7 +243,7 @@ out_of_memory: } static struct grant *get_grant(grant_ref_t *gref_head, - unsigned long pfn, + struct page *page, struct blkfront_info *info) { struct grant *gnt_list_entry; @@ -263,10 +263,10 @@ static struct grant *get_grant(grant_ref_t *gref_head, gnt_list_entry->gref = gnttab_claim_grant_reference(gref_head); BUG_ON(gnt_list_entry->gref == -ENOSPC); if (!info->feature_persistent) { - BUG_ON(!pfn); - gnt_list_entry->pfn = pfn; + BUG_ON(!page); + gnt_list_entry->page = page; } - buffer_mfn = pfn_to_mfn(gnt_list_entry->pfn); + buffer_mfn = page_to_mfn(gnt_list_entry->page); gnttab_grant_foreign_access_ref(gnt_list_entry->gref, info->xbdev->otherend_id, buffer_mfn, 0); @@ -522,7 +522,7 @@ static int blkif_queue_rw_req(struct request *req) if ((ring_req->operation == BLKIF_OP_INDIRECT) && (i % SEGS_PER_INDIRECT_FRAME == 0)) { - unsigned long uninitialized_var(pfn); + struct page *uninitialized_var(page); if (segments) kunmap_atomic(segments); @@ -536,15 +536,15 @@ static int blkif_queue_rw_req(struct request *req) indirect_page = list_first_entry(&info->indirect_pages, struct page, lru); list_del(&indirect_page->lru); - pfn = page_to_pfn(indirect_page); + page = indirect_page; } - gnt_list_entry = get_grant(&gref_head, pfn, info); + gnt_list_entry = get_grant(&gref_head, page, info); info->shadow[id].indirect_grants[n] = gnt_list_entry; - segments = kmap_atomic(pfn_to_page(gnt_list_entry->pfn)); + segments = kmap_atomic(gnt_list_entry->page); ring_req->u.indirect.indirect_grefs[n] = gnt_list_entry->gref; } - gnt_list_entry = get_grant(&gref_head, page_to_pfn(sg_page(sg)), info); + gnt_list_entry = get_grant(&gref_head, sg_page(sg), info); ref = gnt_list_entry->gref; info->shadow[id].grants_used[i] = gnt_list_entry; @@ -555,7 +555,7 @@ static int blkif_queue_rw_req(struct request *req) BUG_ON(sg->offset + sg->length > PAGE_SIZE); - shared_data = kmap_atomic(pfn_to_page(gnt_list_entry->pfn)); + shared_data = kmap_atomic(gnt_list_entry->page); bvec_data = kmap_atomic(sg_page(sg)); /* @@ -1002,7 +1002,7 @@ static void blkif_free(struct blkfront_info *info, int suspend) info->persistent_gnts_c--; } if (info->feature_persistent) - __free_page(pfn_to_page(persistent_gnt->pfn)); + __free_page(persistent_gnt->page); kfree(persistent_gnt); } } @@ -1037,7 +1037,7 @@ static void blkif_free(struct blkfront_info *info, int suspend) persistent_gnt = info->shadow[i].grants_used[j]; gnttab_end_foreign_access(persistent_gnt->gref, 0, 0UL); if (info->feature_persistent) - __free_page(pfn_to_page(persistent_gnt->pfn)); + __free_page(persistent_gnt->page); kfree(persistent_gnt); } @@ -1051,7 +1051,7 @@ static void blkif_free(struct blkfront_info *info, int suspend) for (j = 0; j < INDIRECT_GREFS(segs); j++) { persistent_gnt = info->shadow[i].indirect_grants[j]; gnttab_end_foreign_access(persistent_gnt->gref, 0, 0UL); - __free_page(pfn_to_page(persistent_gnt->pfn)); + __free_page(persistent_gnt->page); kfree(persistent_gnt); } @@ -1102,8 +1102,7 @@ static void blkif_completion(struct blk_shadow *s, struct blkfront_info *info, if (bret->operation == BLKIF_OP_READ && info->feature_persistent) { for_each_sg(s->sg, sg, nseg, i) { BUG_ON(sg->offset + sg->length > PAGE_SIZE); - shared_data = kmap_atomic( - pfn_to_page(s->grants_used[i]->pfn)); + shared_data = kmap_atomic(s->grants_used[i]->page); bvec_data = kmap_atomic(sg_page(sg)); memcpy(bvec_data + sg->offset, shared_data + sg->offset, @@ -1154,7 +1153,7 @@ static void blkif_completion(struct blk_shadow *s, struct blkfront_info *info, * Add the used indirect page back to the list of * available pages for indirect grefs. */ - indirect_page = pfn_to_page(s->indirect_grants[i]->pfn); + indirect_page = s->indirect_grants[i]->page; list_add(&indirect_page->lru, &info->indirect_pages); s->indirect_grants[i]->gref = GRANT_INVALID_REF; list_add_tail(&s->indirect_grants[i]->node, &info->grants); -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/