From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from relay.sgi.com (relay3.corp.sgi.com [198.149.34.15]) by oss.sgi.com (Postfix) with ESMTP id 759AF7CD3 for ; Tue, 3 May 2016 16:29:32 -0500 (CDT) Received: from cuda.sgi.com (cuda3.sgi.com [192.48.176.15]) by relay3.corp.sgi.com (Postfix) with ESMTP id E32A6AC002 for ; Tue, 3 May 2016 14:29:31 -0700 (PDT) Received: from bombadil.infradead.org ([198.137.202.9]) by cuda.sgi.com with ESMTP id vuyJ3N4sCx5RJyMD (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NO) for ; Tue, 03 May 2016 14:29:29 -0700 (PDT) From: Christoph Hellwig Subject: [PATCH 07/14] fs: iomap based fiemap implementation Date: Tue, 3 May 2016 23:29:00 +0200 Message-Id: <1462310947-16132-8-git-send-email-hch@lst.de> In-Reply-To: <1462310947-16132-1-git-send-email-hch@lst.de> References: <1462310947-16132-1-git-send-email-hch@lst.de> List-Id: XFS Filesystem from SGI List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: xfs-bounces@oss.sgi.com Sender: xfs-bounces@oss.sgi.com To: xfs@oss.sgi.com Cc: rpeterso@redhat.com, linux-fsdevel@vger.kernel.org Add a simple fiemap implementation based on iomap_ops, partially based on a previous implementation from Bob Peterson . Signed-off-by: Christoph Hellwig --- fs/iomap.c | 90 +++++++++++++++++++++++++++++++++++++++++++++++++++ include/linux/iomap.h | 3 ++ 2 files changed, 93 insertions(+) diff --git a/fs/iomap.c b/fs/iomap.c index 534cb37..28a8fcb 100644 --- a/fs/iomap.c +++ b/fs/iomap.c @@ -385,3 +385,93 @@ out_unlock: return ret; } EXPORT_SYMBOL_GPL(iomap_page_mkwrite); + +struct fiemap_ctx { + struct fiemap_extent_info *fi; + struct iomap prev; +}; + +static int iomap_to_fiemap(struct fiemap_extent_info *fi, + struct iomap *iomap, u32 flags) +{ + switch (iomap->type) { + case IOMAP_HOLE: + /* skip holes */ + return 0; + case IOMAP_DELALLOC: + flags |= FIEMAP_EXTENT_DELALLOC | FIEMAP_EXTENT_UNKNOWN; + break; + case IOMAP_UNWRITTEN: + flags |= FIEMAP_EXTENT_UNWRITTEN; + break; + case IOMAP_MAPPED: + break; + } + + return fiemap_fill_next_extent(fi, iomap->offset, + iomap->blkno != IOMAP_NULL_BLOCK ? iomap->blkno << 9: 0, + iomap->length, flags | FIEMAP_EXTENT_MERGED); + +} + +static loff_t +iomap_fiemap_actor(struct inode *inode, loff_t pos, loff_t length, void *data, + struct iomap *iomap) +{ + struct fiemap_ctx *ctx = data; + loff_t ret = length; + + if (iomap->type == IOMAP_HOLE) + return length; + + ret = iomap_to_fiemap(ctx->fi, &ctx->prev, 0); + ctx->prev = *iomap; + switch (ret) { + case 0: /* success */ + return length; + case 1: /* extent array full */ + return 0; + default: + return ret; + } +} + +int iomap_fiemap(struct inode *inode, struct fiemap_extent_info *fi, + loff_t start, loff_t len, struct iomap_ops *ops) +{ + struct fiemap_ctx ctx; + loff_t ret; + + memset(&ctx, 0, sizeof(ctx)); + ctx.fi = fi; + ctx.prev.type = IOMAP_HOLE; + + ret = fiemap_check_flags(fi, FIEMAP_FLAG_SYNC); + if (ret) + return ret; + + ret = filemap_write_and_wait(inode->i_mapping); + if (ret) + return ret; + + while (len > 0) { + ret = iomap_apply(inode, start, len, 0, ops, &ctx, + iomap_fiemap_actor); + if (ret < 0) + return ret; + if (ret == 0) + break; + + start += ret; + len -= ret; + } + + if (ctx.prev.type != IOMAP_HOLE) { + ret = iomap_to_fiemap(fi, &ctx.prev, FIEMAP_EXTENT_LAST); + if (ret < 0) + return ret; + } + + return 0; +} +EXPORT_SYMBOL_GPL(iomap_fiemap); diff --git a/include/linux/iomap.h b/include/linux/iomap.h index 854766f..b3deee1 100644 --- a/include/linux/iomap.h +++ b/include/linux/iomap.h @@ -3,6 +3,7 @@ #include +struct fiemap_extent_info; struct inode; struct iov_iter; struct kiocb; @@ -63,5 +64,7 @@ int iomap_truncate_page(struct inode *inode, loff_t pos, bool *did_zero, struct iomap_ops *ops); int iomap_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf, struct iomap_ops *ops); +int iomap_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, + loff_t start, loff_t len, struct iomap_ops *ops); #endif /* LINUX_IOMAP_H */ -- 2.1.4 _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs