From patchwork Sun Jul 17 23:59:02 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Jim Rees X-Patchwork-Id: 985152 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter2.kernel.org (8.14.4/8.14.4) with ESMTP id p6HNxWJl030233 for ; Sun, 17 Jul 2011 23:59:40 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756409Ab1GQX7j (ORCPT ); Sun, 17 Jul 2011 19:59:39 -0400 Received: from merit-proxy01.merit.edu ([207.75.116.193]:37600 "EHLO merit-proxy01.merit.edu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756404Ab1GQX7j (ORCPT ); Sun, 17 Jul 2011 19:59:39 -0400 Received: from localhost (localhost.localdomain [127.0.0.1]) by merit-proxy01.merit.edu (Postfix) with ESMTP id BF3F4203984E; Sun, 17 Jul 2011 19:59:38 -0400 (EDT) X-Virus-Scanned: amavisd-new at merit-proxy01.merit.edu Received: from merit-proxy01.merit.edu ([127.0.0.1]) by localhost (merit-proxy01.merit.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id dtd490gCq1tM; Sun, 17 Jul 2011 19:59:38 -0400 (EDT) Received: from merit.edu (74-126-0-171.static.123.net [74.126.0.171]) by merit-proxy01.merit.edu (Postfix) with ESMTPSA id 13724203984D; Sun, 17 Jul 2011 19:59:38 -0400 (EDT) From: Jim Rees To: Trond Myklebust Cc: linux-nfs@vger.kernel.org Subject: [PATCH v1 15/25] pnfsblock: bl_find_get_extent Date: Sun, 17 Jul 2011 19:59:02 -0400 Message-Id: <1310947152-12255-16-git-send-email-rees@umich.edu> X-Mailer: git-send-email 1.7.4.1 In-Reply-To: <1310947152-12255-1-git-send-email-rees@umich.edu> References: <1310947152-12255-1-git-send-email-rees@umich.edu> MIME-Version: 1.0 Sender: linux-nfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.6 (demeter2.kernel.org [140.211.167.43]); Sun, 17 Jul 2011 23:59:40 +0000 (UTC) From: Fred Implement bl_find_get_extent(), one of the core extent manipulation routines. [pnfsblock: Lookup list entry of layouts and tags in reverse order] Signed-off-by: Zhang Jingwang Signed-off-by: Fred Isaman Signed-off-by: Benny Halevy pnfsblock: fix print format warnings for sector_t and size_t gcc spews warnings about these on x86_64, e.g.: fs/nfs/blocklayout/blocklayout.c:74: warning: format ‘%Lu’ expects type ‘long long unsigned int’, but argument 2 has type ‘sector_t’ fs/nfs/blocklayout/blocklayout.c:388: warning: format ‘%d’ expects type ‘int’, but argument 5 has type ‘size_t’ Signed-off-by: Benny Halevy Signed-off-by: Benny Halevy --- fs/nfs/blocklayout/blocklayout.h | 3 ++ fs/nfs/blocklayout/extents.c | 47 ++++++++++++++++++++++++++++++++++++++ 2 files changed, 50 insertions(+), 0 deletions(-) diff --git a/fs/nfs/blocklayout/blocklayout.h b/fs/nfs/blocklayout/blocklayout.h index ee402c7..4e61b52 100644 --- a/fs/nfs/blocklayout/blocklayout.h +++ b/fs/nfs/blocklayout/blocklayout.h @@ -197,6 +197,9 @@ int nfs4_blk_process_layoutget(struct pnfs_layout_hdr *lo, void free_block_dev(struct pnfs_block_dev *bdev); /* extents.c */ +struct pnfs_block_extent * +bl_find_get_extent(struct pnfs_block_layout *bl, sector_t isect, + struct pnfs_block_extent **cow_read); void bl_put_extent(struct pnfs_block_extent *be); struct pnfs_block_extent *alloc_extent(void); int bl_add_merge_extent(struct pnfs_block_layout *bl, diff --git a/fs/nfs/blocklayout/extents.c b/fs/nfs/blocklayout/extents.c index d76bb43..14065ca 100644 --- a/fs/nfs/blocklayout/extents.c +++ b/fs/nfs/blocklayout/extents.c @@ -201,3 +201,50 @@ bl_add_merge_extent(struct pnfs_block_layout *bl, bl_put_extent(new); return -EIO; } + +/* Returns extent, or NULL. If a second READ extent exists, it is returned + * in cow_read, if given. + * + * The extents are kept in two seperate ordered lists, one for READ and NONE, + * one for READWRITE and INVALID. Within each list, we assume: + * 1. Extents are ordered by file offset. + * 2. For any given isect, there is at most one extents that matches. + */ +struct pnfs_block_extent * +bl_find_get_extent(struct pnfs_block_layout *bl, sector_t isect, + struct pnfs_block_extent **cow_read) +{ + struct pnfs_block_extent *be, *cow, *ret; + int i; + + dprintk("%s enter with isect %llu\n", __func__, (u64)isect); + cow = ret = NULL; + spin_lock(&bl->bl_ext_lock); + for (i = 0; i < EXTENT_LISTS; i++) { + if (ret && + (!cow_read || ret->be_state != PNFS_BLOCK_INVALID_DATA)) + break; + list_for_each_entry_reverse(be, &bl->bl_extents[i], be_node) { + if (isect >= be->be_f_offset + be->be_length) + break; + if (isect >= be->be_f_offset) { + /* We have found an extent */ + dprintk("%s Get %p (%i)\n", __func__, be, + atomic_read(&be->be_refcnt.refcount)); + kref_get(&be->be_refcnt); + if (!ret) + ret = be; + else if (be->be_state != PNFS_BLOCK_READ_DATA) + bl_put_extent(be); + else + cow = be; + break; + } + } + } + spin_unlock(&bl->bl_ext_lock); + if (cow_read) + *cow_read = cow; + print_bl_extent(ret); + return ret; +}