From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id EA0ABC43214 for ; Thu, 19 Aug 2021 00:01:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CB59461051 for ; Thu, 19 Aug 2021 00:01:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235041AbhHSABh (ORCPT ); Wed, 18 Aug 2021 20:01:37 -0400 Received: from mail105.syd.optusnet.com.au ([211.29.132.249]:44510 "EHLO mail105.syd.optusnet.com.au" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234986AbhHSABg (ORCPT ); Wed, 18 Aug 2021 20:01:36 -0400 Received: from dread.disaster.area (pa49-195-182-146.pa.nsw.optusnet.com.au [49.195.182.146]) by mail105.syd.optusnet.com.au (Postfix) with ESMTPS id E23CE104A544 for ; Thu, 19 Aug 2021 10:00:58 +1000 (AEST) Received: from discord.disaster.area ([192.168.253.110]) by dread.disaster.area with esmtp (Exim 4.92.3) (envelope-from ) id 1mGVUQ-002JSA-5r for linux-xfs@vger.kernel.org; Thu, 19 Aug 2021 10:00:58 +1000 Received: from dave by discord.disaster.area with local (Exim 4.94) (envelope-from ) id 1mGVUP-000d1b-Tt for linux-xfs@vger.kernel.org; Thu, 19 Aug 2021 10:00:57 +1000 From: Dave Chinner To: linux-xfs@vger.kernel.org Subject: [PATCH 3/3] xfs: rename buffer cache index variable b_bn Date: Thu, 19 Aug 2021 10:00:55 +1000 Message-Id: <20210819000055.149955-4-david@fromorbit.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210819000055.149955-1-david@fromorbit.com> References: <20210819000055.149955-1-david@fromorbit.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Optus-CM-Score: 0 X-Optus-CM-Analysis: v=2.3 cv=YKPhNiOx c=1 sm=1 tr=0 a=QpfB3wCSrn/dqEBSktpwZQ==:117 a=QpfB3wCSrn/dqEBSktpwZQ==:17 a=MhDmnRu9jo8A:10 a=20KFwNOVAAAA:8 a=t0MN_ZO9zPffNZN11lIA:9 a=nxKHTeQCLbDLIkZB:21 a=-Yni5f4vD_2Esc7K:21 Precedence: bulk List-ID: X-Mailing-List: linux-xfs@vger.kernel.org From: Dave Chinner To stop external users from using b_bn as the disk address of the buffer, rename it to b_rhash_key to indicate that it is the buffer cache index, not the block number of the buffer. Code that needs the disk address should use xfs_buf_daddr() to obtain it. Do the rename and clean up any of the remaining internal b_bn users. Also clean up any remaining b_bn cruft that is now unused. Signed-off-by: Dave Chinner Reviewed-by: Christoph Hellwig --- fs/xfs/xfs_buf.c | 19 +++++++++++-------- fs/xfs/xfs_buf.h | 18 +----------------- 2 files changed, 12 insertions(+), 25 deletions(-) diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c index c1bb6e41595b..047bd6e3f389 100644 --- a/fs/xfs/xfs_buf.c +++ b/fs/xfs/xfs_buf.c @@ -251,7 +251,7 @@ _xfs_buf_alloc( return error; } - bp->b_bn = map[0].bm_bn; + bp->b_rhash_key = map[0].bm_bn; bp->b_length = 0; for (i = 0; i < nmaps; i++) { bp->b_maps[i].bm_bn = map[i].bm_bn; @@ -459,7 +459,7 @@ _xfs_buf_obj_cmp( */ BUILD_BUG_ON(offsetof(struct xfs_buf_map, bm_bn) != 0); - if (bp->b_bn != map->bm_bn) + if (bp->b_rhash_key != map->bm_bn) return 1; if (unlikely(bp->b_length != map->bm_len)) { @@ -481,7 +481,7 @@ static const struct rhashtable_params xfs_buf_hash_params = { .min_size = 32, /* empty AGs have minimal footprint */ .nelem_hint = 16, .key_len = sizeof(xfs_daddr_t), - .key_offset = offsetof(struct xfs_buf, b_bn), + .key_offset = offsetof(struct xfs_buf, b_rhash_key), .head_offset = offsetof(struct xfs_buf, b_rhash_head), .automatic_shrinking = true, .obj_cmpfn = _xfs_buf_obj_cmp, @@ -853,7 +853,9 @@ xfs_buf_readahead_map( /* * Read an uncached buffer from disk. Allocates and returns a locked - * buffer containing the disk contents or nothing. + * buffer containing the disk contents or nothing. Uncached buffers always have + * a cache index of XFS_BUF_DADDR_NULL so we can easily determine if the buffer + * is cached or uncached during fault diagnosis. */ int xfs_buf_read_uncached( @@ -875,7 +877,7 @@ xfs_buf_read_uncached( /* set up the buffer for a read IO */ ASSERT(bp->b_map_count == 1); - bp->b_bn = XFS_BUF_DADDR_NULL; /* always null for uncached buffers */ + bp->b_rhash_key = XFS_BUF_DADDR_NULL; bp->b_maps[0].bm_bn = daddr; bp->b_flags |= XBF_READ; bp->b_ops = ops; @@ -1513,7 +1515,7 @@ _xfs_buf_ioapply( SHUTDOWN_CORRUPT_INCORE); return; } - } else if (bp->b_bn != XFS_BUF_DADDR_NULL) { + } else if (bp->b_rhash_key != XFS_BUF_DADDR_NULL) { struct xfs_mount *mp = bp->b_mount; /* @@ -1523,7 +1525,8 @@ _xfs_buf_ioapply( if (xfs_has_crc(mp)) { xfs_warn(mp, "%s: no buf ops on daddr 0x%llx len %d", - __func__, bp->b_bn, bp->b_length); + __func__, xfs_buf_daddr(bp), + bp->b_length); xfs_hex_dump(bp->b_addr, XFS_CORRUPTION_DUMP_LEN); dump_stack(); @@ -1793,7 +1796,7 @@ xfs_buftarg_drain( xfs_buf_alert_ratelimited(bp, "XFS: Corruption Alert", "Corruption Alert: Buffer at daddr 0x%llx had permanent write failures!", - (long long)bp->b_bn); + (long long)xfs_buf_daddr(bp)); } xfs_buf_rele(bp); } diff --git a/fs/xfs/xfs_buf.h b/fs/xfs/xfs_buf.h index 6db2fba44b46..6b0200b8007d 100644 --- a/fs/xfs/xfs_buf.h +++ b/fs/xfs/xfs_buf.h @@ -134,11 +134,7 @@ struct xfs_buf { */ struct rhash_head b_rhash_head; /* pag buffer hash node */ - /* - * b_bn is the cache index. Do not use directly, use b_maps[0].bm_bn - * for the buffer disk address instead. - */ - xfs_daddr_t b_bn; + xfs_daddr_t b_rhash_key; /* buffer cache index */ int b_length; /* size of buffer in BBs */ atomic_t b_hold; /* reference count */ atomic_t b_lru_ref; /* lru reclaim ref count */ @@ -301,18 +297,6 @@ extern int xfs_buf_delwri_pushbuf(struct xfs_buf *, struct list_head *); extern int xfs_buf_init(void); extern void xfs_buf_terminate(void); -/* - * These macros use the IO block map rather than b_bn. b_bn is now really - * just for the buffer cache index for cached buffers. As IO does not use b_bn - * anymore, uncached buffers do not use b_bn at all and hence must modify the IO - * map directly. Uncached buffers are not allowed to be discontiguous, so this - * is safe to do. - * - * In future, uncached buffers will pass the block number directly to the io - * request function and hence these macros will go away at that point. - */ -#define XFS_BUF_SET_ADDR(bp, bno) ((bp)->b_maps[0].bm_bn = (xfs_daddr_t)(bno)) - static inline xfs_daddr_t xfs_buf_daddr(struct xfs_buf *bp) { return bp->b_maps[0].bm_bn; -- 2.31.1