From patchwork Wed Sep 15 10:44:59 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shiyang Ruan X-Patchwork-Id: 12495969 Received: from heian.cn.fujitsu.com (mail.cn.fujitsu.com [183.91.158.132]) by smtp.subspace.kernel.org (Postfix) with ESMTP id D212B3FD8 for ; Wed, 15 Sep 2021 10:45:55 +0000 (UTC) IronPort-Data: A9a23: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 IronPort-HdrOrdr: A9a23:KcMqVqu7Toj1qSQ3/ShclU8r7skDE9V00zEX/kB9WHVpm62j9/xG88536faZslwssRIb+OxoWpPufZq0z/ccirX5VY3SPzUO01HFEGgN1+Xf/wE= X-IronPort-AV: E=Sophos;i="5.85,295,1624291200"; d="scan'208";a="114519059" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 15 Sep 2021 18:45:51 +0800 Received: from G08CNEXMBPEKD05.g08.fujitsu.local (unknown [10.167.33.204]) by cn.fujitsu.com (Postfix) with ESMTP id 90B3A4D0DC71; Wed, 15 Sep 2021 18:45:47 +0800 (CST) Received: from G08CNEXCHPEKD09.g08.fujitsu.local (10.167.33.85) by G08CNEXMBPEKD05.g08.fujitsu.local (10.167.33.204) with Microsoft SMTP Server (TLS) id 15.0.1497.23; Wed, 15 Sep 2021 18:45:47 +0800 Received: from irides.mr.mr.mr (10.167.225.141) by G08CNEXCHPEKD09.g08.fujitsu.local (10.167.33.209) with Microsoft SMTP Server id 15.0.1497.23 via Frontend Transport; Wed, 15 Sep 2021 18:45:46 +0800 From: Shiyang Ruan To: , , CC: , , , , , , , , , Goldwyn Rodrigues Subject: [PATCH v9 6/8] fsdax: Dedup file range to use a compare function Date: Wed, 15 Sep 2021 18:44:59 +0800 Message-ID: <20210915104501.4146910-7-ruansy.fnst@fujitsu.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210915104501.4146910-1-ruansy.fnst@fujitsu.com> References: <20210915104501.4146910-1-ruansy.fnst@fujitsu.com> Precedence: bulk X-Mailing-List: nvdimm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-yoursite-MailScanner-ID: 90B3A4D0DC71.A13F7 X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: ruansy.fnst@fujitsu.com X-Spam-Status: No With dax we cannot deal with readpage() etc. So, we create a dax comparison function which is similar with vfs_dedupe_file_range_compare(). And introduce dax_remap_file_range_prep() for filesystem use. Signed-off-by: Goldwyn Rodrigues Signed-off-by: Shiyang Ruan Reviewed-by: Darrick J. Wong Reviewed-by: Christoph Hellwig --- fs/dax.c | 79 ++++++++++++++++++++++++++++++++++++++++++++ fs/remap_range.c | 31 ++++++++++++++--- fs/xfs/xfs_reflink.c | 8 +++-- include/linux/dax.h | 8 +++++ include/linux/fs.h | 12 ++++--- 5 files changed, 127 insertions(+), 11 deletions(-) diff --git a/fs/dax.c b/fs/dax.c index ca4308c85988..33b0b9f4b904 100644 --- a/fs/dax.c +++ b/fs/dax.c @@ -1815,3 +1815,82 @@ vm_fault_t dax_finish_sync_fault(struct vm_fault *vmf, return dax_insert_pfn_mkwrite(vmf, pfn, order); } EXPORT_SYMBOL_GPL(dax_finish_sync_fault); + +static loff_t dax_range_compare_iter(struct iomap_iter *it_src, + struct iomap_iter *it_dest, bool *same) +{ + const struct iomap *smap = &it_src->iomap; + const struct iomap *dmap = &it_dest->iomap; + loff_t pos1 = it_src->pos, pos2 = it_dest->pos; + loff_t len = min(smap->length, dmap->length); + void *saddr, *daddr; + int id, ret; + + if (smap->type == IOMAP_HOLE && dmap->type == IOMAP_HOLE) { + *same = true; + return len; + } + + if (smap->type == IOMAP_HOLE || dmap->type == IOMAP_HOLE) { + *same = false; + return 0; + } + + id = dax_read_lock(); + ret = dax_iomap_direct_access(smap, pos1, ALIGN(pos1 + len, PAGE_SIZE), + &saddr, NULL); + if (ret < 0) + goto out_unlock; + + ret = dax_iomap_direct_access(dmap, pos2, ALIGN(pos2 + len, PAGE_SIZE), + &daddr, NULL); + if (ret < 0) + goto out_unlock; + + *same = !memcmp(saddr, daddr, len); + if (!*same) + len = 0; + dax_read_unlock(id); + return len; + +out_unlock: + dax_read_unlock(id); + return -EIO; +} + +int dax_dedupe_file_range_compare(struct inode *src, loff_t srcoff, + struct inode *dst, loff_t dstoff, loff_t len, bool *same, + const struct iomap_ops *ops) +{ + struct iomap_iter src_iter = { + .inode = src, + .pos = srcoff, + .len = len, + }; + struct iomap_iter dst_iter = { + .inode = dst, + .pos = dstoff, + .len = len, + }; + int ret; + + while ((ret = iomap_iter(&src_iter, ops)) > 0) { + while ((ret = iomap_iter(&dst_iter, ops)) > 0) { + dst_iter.processed = dax_range_compare_iter(&src_iter, + &dst_iter, same); + } + if (ret <= 0) + src_iter.processed = ret; + } + return ret; +} + +int dax_remap_file_range_prep(struct file *file_in, loff_t pos_in, + struct file *file_out, loff_t pos_out, + loff_t *len, unsigned int remap_flags, + const struct iomap_ops *ops) +{ + return __generic_remap_file_range_prep(file_in, pos_in, file_out, + pos_out, len, remap_flags, ops); +} +EXPORT_SYMBOL_GPL(dax_remap_file_range_prep); diff --git a/fs/remap_range.c b/fs/remap_range.c index 6d4a9beaa097..1157169b9d79 100644 --- a/fs/remap_range.c +++ b/fs/remap_range.c @@ -14,6 +14,7 @@ #include #include #include +#include #include "internal.h" #include @@ -277,9 +278,11 @@ static int vfs_dedupe_file_range_compare(struct inode *src, loff_t srcoff, * If there's an error, then the usual negative error code is returned. * Otherwise returns 0 with *len set to the request length. */ -int generic_remap_file_range_prep(struct file *file_in, loff_t pos_in, - struct file *file_out, loff_t pos_out, - loff_t *len, unsigned int remap_flags) +int +__generic_remap_file_range_prep(struct file *file_in, loff_t pos_in, + struct file *file_out, loff_t pos_out, + loff_t *len, unsigned int remap_flags, + const struct iomap_ops *dax_read_ops) { struct inode *inode_in = file_inode(file_in); struct inode *inode_out = file_inode(file_out); @@ -339,8 +342,18 @@ int generic_remap_file_range_prep(struct file *file_in, loff_t pos_in, if (remap_flags & REMAP_FILE_DEDUP) { bool is_same = false; - ret = vfs_dedupe_file_range_compare(inode_in, pos_in, - inode_out, pos_out, *len, &is_same); + if (*len == 0) + return 0; + + if (!IS_DAX(inode_in)) + ret = vfs_dedupe_file_range_compare(inode_in, pos_in, + inode_out, pos_out, *len, &is_same); + else if (dax_read_ops) + ret = dax_dedupe_file_range_compare(inode_in, pos_in, + inode_out, pos_out, *len, &is_same, + dax_read_ops); + else + return -EINVAL; if (ret) return ret; if (!is_same) @@ -358,6 +371,14 @@ int generic_remap_file_range_prep(struct file *file_in, loff_t pos_in, return ret; } + +int generic_remap_file_range_prep(struct file *file_in, loff_t pos_in, + struct file *file_out, loff_t pos_out, + loff_t *len, unsigned int remap_flags) +{ + return __generic_remap_file_range_prep(file_in, pos_in, file_out, + pos_out, len, remap_flags, NULL); +} EXPORT_SYMBOL(generic_remap_file_range_prep); loff_t do_clone_file_range(struct file *file_in, loff_t pos_in, diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c index 76355f293488..7ecea0311e88 100644 --- a/fs/xfs/xfs_reflink.c +++ b/fs/xfs/xfs_reflink.c @@ -1332,8 +1332,12 @@ xfs_reflink_remap_prep( if (IS_DAX(inode_in) || IS_DAX(inode_out)) goto out_unlock; - ret = generic_remap_file_range_prep(file_in, pos_in, file_out, pos_out, - len, remap_flags); + if (!IS_DAX(inode_in)) + ret = generic_remap_file_range_prep(file_in, pos_in, file_out, + pos_out, len, remap_flags); + else + ret = dax_remap_file_range_prep(file_in, pos_in, file_out, + pos_out, len, remap_flags, &xfs_read_iomap_ops); if (ret || *len == 0) goto out_unlock; diff --git a/include/linux/dax.h b/include/linux/dax.h index 642de7ef1a10..b975629a8d5b 100644 --- a/include/linux/dax.h +++ b/include/linux/dax.h @@ -212,6 +212,14 @@ int dax_delete_mapping_entry(struct address_space *mapping, pgoff_t index); int dax_invalidate_mapping_entry_sync(struct address_space *mapping, pgoff_t index); s64 dax_iomap_zero(struct iomap_iter *iter, loff_t pos, u64 length); +int dax_dedupe_file_range_compare(struct inode *src, loff_t srcoff, + struct inode *dest, loff_t destoff, + loff_t len, bool *is_same, + const struct iomap_ops *ops); +int dax_remap_file_range_prep(struct file *file_in, loff_t pos_in, + struct file *file_out, loff_t pos_out, + loff_t *len, unsigned int remap_flags, + const struct iomap_ops *ops); static inline bool dax_mapping(struct address_space *mapping) { return mapping->host && IS_DAX(mapping->host); diff --git a/include/linux/fs.h b/include/linux/fs.h index e7a633353fd2..670b53c722a7 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -71,6 +71,7 @@ struct fsverity_operations; struct fs_context; struct fs_parameter_spec; struct fileattr; +struct iomap_ops; extern void __init inode_init(void); extern void __init inode_init_early(void); @@ -2175,10 +2176,13 @@ extern ssize_t vfs_copy_file_range(struct file *, loff_t , struct file *, extern ssize_t generic_copy_file_range(struct file *file_in, loff_t pos_in, struct file *file_out, loff_t pos_out, size_t len, unsigned int flags); -extern int generic_remap_file_range_prep(struct file *file_in, loff_t pos_in, - struct file *file_out, loff_t pos_out, - loff_t *count, - unsigned int remap_flags); +int __generic_remap_file_range_prep(struct file *file_in, loff_t pos_in, + struct file *file_out, loff_t pos_out, + loff_t *len, unsigned int remap_flags, + const struct iomap_ops *dax_read_ops); +int generic_remap_file_range_prep(struct file *file_in, loff_t pos_in, + struct file *file_out, loff_t pos_out, + loff_t *count, unsigned int remap_flags); extern loff_t do_clone_file_range(struct file *file_in, loff_t pos_in, struct file *file_out, loff_t pos_out, loff_t len, unsigned int remap_flags);