From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out30-118.freemail.mail.aliyun.com (out30-118.freemail.mail.aliyun.com [115.124.30.118]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AEB7C3EA66 for ; Mon, 15 Jun 2026 05:10:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=115.124.30.118 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781500228; cv=none; b=kj38I1ZdNL4rvWsf8b4imqzxFDv/6stF9cQ0zWR/lT3SsQaIZLC8Xv0vqTCgMSgfIdFalMnH0lvRoUaVbn4THo/mlNjfH0fNE5855X5ZgXH/1xWDsF+5RbW8BdPnaZfU8IEe27V5Q0os+J9/ffw05hl4jjthk/8kVCdf6bZDzcI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781500228; c=relaxed/simple; bh=e5ubnKU754ktuKlKx0tXOp6F/TSmfuE/ymCrzBhskz8=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=g54KFTV3KrygA8vSY/XZ35kJW/CLouPXf1z6KJhzy/cKSiIr1TC27BxyFzg+ZGSAREfIfhtxO/zW8mrb929iX6ToWbFRFiamdLllUPGtTNG8LRVuMtSh7FZMOeCPHkn6n/GHTzX8korhqzDuQDvEdUuz4jLrU8scCSanAMQO3Lc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com; spf=pass smtp.mailfrom=linux.alibaba.com; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b=uPfyL0ZV; arc=none smtp.client-ip=115.124.30.118 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b="uPfyL0ZV" DKIM-Signature:v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1781500221; h=From:To:Subject:Date:Message-ID:MIME-Version; bh=qrZoHhpZ8qiUfDzxaLwT9t9rEuEsMXrsfA9Z/wGiJ8U=; b=uPfyL0ZVrM/pAP/9B5z79tEra67Cl914jw0jBxkwsdOc49GcE/FYRqrY5EHcuAGigTPzul6jPkKv5C7ettbcSbimcKZG/irkYzmfDj/9RA93rVB74xyg3AS2p2HbXIy//MULoleJ+kCkZwCWYiVJKnY+dNzUY0mExoy+UI0Tg4o= X-Alimail-AntiSpam:AC=PASS;BC=-1|-1;BR=01201311R191e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=maildocker-contentspam033045133197;MF=hsiangkao@linux.alibaba.com;NM=1;PH=DS;RN=4;SR=0;TI=SMTPD_---0X4pAs62_1781500217; Received: from x31i01179.sqa.na131.tbsite.net(mailfrom:hsiangkao@linux.alibaba.com fp:SMTPD_---0X4pAs62_1781500217 cluster:ay36) by smtp.aliyun-inc.com; Mon, 15 Jun 2026 13:10:21 +0800 From: Gao Xiang To: linux-erofs@lists.ozlabs.org Cc: LKML , oliver.yang@linux.alibaba.com, Gao Xiang Subject: [PATCH] erofs: introduce erofs_map_chunks() Date: Mon, 15 Jun 2026 13:10:16 +0800 Message-ID: <20260615051016.27430-1-hsiangkao@linux.alibaba.com> X-Mailer: git-send-email 2.43.5 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Try to map more chunks in the same metadata on-disk block for more efficient IO performance. Also unset `map->m_plen` since it's unneeded for plain data. Signed-off-by: Gao Xiang --- fs/erofs/data.c | 126 +++++++++++++++++++++++++----------------------- 1 file changed, 66 insertions(+), 60 deletions(-) diff --git a/fs/erofs/data.c b/fs/erofs/data.c index 44da21c9d777..f75c391b098a 100644 --- a/fs/erofs/data.c +++ b/fs/erofs/data.c @@ -98,17 +98,69 @@ void *erofs_read_metabuf(struct erofs_buf *buf, struct super_block *sb, return erofs_bread(buf, offset, true); } -int erofs_map_blocks(struct inode *inode, struct erofs_map_blocks *map) +static int erofs_map_chunks(struct inode *inode, struct erofs_map_blocks *map) { struct erofs_buf buf = __EROFS_BUF_INITIALIZER; struct super_block *sb = inode->i_sb; - unsigned int unit, blksz = sb->s_blocksize; struct erofs_inode *vi = EROFS_I(inode); struct erofs_inode_chunk_index *idx; - erofs_blk_t startblk, addrmask; - bool tailpacking; + unsigned int unit = vi->chunkformat & EROFS_CHUNK_FORMAT_INDEXES ? + sizeof(*idx) : EROFS_BLOCK_MAP_ENTRY_SIZE; + erofs_blk_t addrmask = (vi->chunkformat & EROFS_CHUNK_FORMAT_48BIT) ? + BIT_ULL(48) - 1 : BIT_ULL(32) - 1; + u64 nr = map->m_la >> vi->chunkbits; + erofs_off_t pos = ALIGN(erofs_iloc(inode) + vi->inode_isize + + vi->xattr_isize, unit) + unit * nr; + erofs_off_t endpos = round_up(pos, sb->s_blocksize); + u64 last, addr; + + idx = erofs_read_metabuf(&buf, sb, pos, erofs_inode_in_metabox(inode)); + if (IS_ERR(idx)) + return PTR_ERR(idx); + + map->m_la = nr << vi->chunkbits; + map->m_llen = 0; + nr = 0; + do { + if (unit == EROFS_BLOCK_MAP_ENTRY_SIZE) { + addr = le32_to_cpu(((__le32 *)idx)[nr]); + if (addr == (u32)EROFS_NULL_ADDR) + addr = EROFS_NULL_ADDR; + } else { + addr = (((u64)le16_to_cpu(idx[nr].startblk_hi) << 32) | + le32_to_cpu(idx[nr].startblk_lo)) & addrmask; + if (addr ^ (EROFS_NULL_ADDR & addrmask)) + addr |= (u64)(le16_to_cpu(idx[nr].device_id) & + EROFS_SB(sb)->device_id_mask) << 48; + else + addr = EROFS_NULL_ADDR; + } + if (!nr) { + last = addr; + } else { + if (last != EROFS_NULL_ADDR) + last += erofs_blknr(sb, 1UL << vi->chunkbits); + map->m_llen += 1UL << vi->chunkbits; + } + } while (addr == last && pos + (++nr) * unit < endpos); + + if (last != EROFS_NULL_ADDR) { + map->m_pa = erofs_pos(sb, last & addrmask) - map->m_llen; + map->m_deviceid = last >> 48; + map->m_flags = EROFS_MAP_MAPPED; + } + map->m_llen = min_t(erofs_off_t, map->m_llen + (1UL << vi->chunkbits), + round_up(inode->i_size - map->m_la, sb->s_blocksize)); + erofs_put_metabuf(&buf); + return 0; +} + +int erofs_map_blocks(struct inode *inode, struct erofs_map_blocks *map) +{ + struct super_block *sb = inode->i_sb; + struct erofs_inode *vi = EROFS_I(inode); + bool tailinline = (vi->datalayout == EROFS_INODE_FLAT_INLINE); erofs_off_t pos; - u64 chunknr; int err = 0; trace_erofs_map_blocks_enter(inode, map, 0); @@ -116,13 +168,10 @@ int erofs_map_blocks(struct inode *inode, struct erofs_map_blocks *map) map->m_flags = 0; if (map->m_la >= inode->i_size) goto out; - - if (vi->datalayout != EROFS_INODE_CHUNK_BASED) { - tailpacking = (vi->datalayout == EROFS_INODE_FLAT_INLINE); - if (!tailpacking && vi->startblk == EROFS_NULL_ADDR) - goto out; - pos = erofs_pos(sb, erofs_iblks(inode) - tailpacking); - + if (vi->datalayout == EROFS_INODE_CHUNK_BASED) { + err = erofs_map_chunks(inode, map); + } else if (tailinline || vi->startblk != EROFS_NULL_ADDR) { + pos = erofs_pos(sb, erofs_iblks(inode) - tailinline); map->m_flags = EROFS_MAP_MAPPED; if (map->m_la < pos) { map->m_pa = erofs_pos(sb, vi->startblk) + map->m_la; @@ -132,57 +181,14 @@ int erofs_map_blocks(struct inode *inode, struct erofs_map_blocks *map) vi->xattr_isize + erofs_blkoff(sb, map->m_la); map->m_llen = inode->i_size - map->m_la; map->m_flags |= EROFS_MAP_META; - } - goto out; - } - - if (vi->chunkformat & EROFS_CHUNK_FORMAT_INDEXES) - unit = sizeof(*idx); /* chunk index */ - else - unit = EROFS_BLOCK_MAP_ENTRY_SIZE; /* block map */ - - chunknr = map->m_la >> vi->chunkbits; - pos = ALIGN(erofs_iloc(inode) + vi->inode_isize + - vi->xattr_isize, unit) + unit * chunknr; - - idx = erofs_read_metabuf(&buf, sb, pos, erofs_inode_in_metabox(inode)); - if (IS_ERR(idx)) { - err = PTR_ERR(idx); - goto out; - } - map->m_la = chunknr << vi->chunkbits; - map->m_llen = min_t(erofs_off_t, 1UL << vi->chunkbits, - round_up(inode->i_size - map->m_la, blksz)); - if (vi->chunkformat & EROFS_CHUNK_FORMAT_INDEXES) { - addrmask = (vi->chunkformat & EROFS_CHUNK_FORMAT_48BIT) ? - BIT_ULL(48) - 1 : BIT_ULL(32) - 1; - startblk = (((u64)le16_to_cpu(idx->startblk_hi) << 32) | - le32_to_cpu(idx->startblk_lo)) & addrmask; - if ((startblk ^ EROFS_NULL_ADDR) & addrmask) { - map->m_deviceid = le16_to_cpu(idx->device_id) & - EROFS_SB(sb)->device_id_mask; - map->m_pa = erofs_pos(sb, startblk); - map->m_flags = EROFS_MAP_MAPPED; - } - } else { - startblk = le32_to_cpu(*(__le32 *)idx); - if (startblk != (u32)EROFS_NULL_ADDR) { - map->m_pa = erofs_pos(sb, startblk); - map->m_flags = EROFS_MAP_MAPPED; + if (erofs_blkoff(sb, map->m_pa) + map->m_llen > + sb->s_blocksize) { + erofs_err(sb, "inline data across blocks @ nid %llu", vi->nid); + return -EFSCORRUPTED; + } } } - erofs_put_metabuf(&buf); out: - if (!err) { - map->m_plen = map->m_llen; - /* inline data should be located in the same meta block */ - if ((map->m_flags & EROFS_MAP_META) && - erofs_blkoff(sb, map->m_pa) + map->m_plen > blksz) { - erofs_err(sb, "inline data across blocks @ nid %llu", vi->nid); - DBG_BUGON(1); - return -EFSCORRUPTED; - } - } trace_erofs_map_blocks_exit(inode, map, 0, err); return err; } -- 2.43.5