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From: "Darrick J. Wong" <djwong@kernel.org>
To: Christoph Hellwig <hch@lst.de>
Cc: Dan Williams <dan.j.williams@intel.com>,
	Matthew Wilcox <willy@infradead.org>,
	Andreas Gruenbacher <agruenba@redhat.com>,
	Shiyang Ruan <ruansy.fnst@fujitsu.com>,
	linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	linux-btrfs@vger.kernel.org, nvdimm@lists.linux.dev,
	cluster-devel@redhat.com
Subject: Re: [PATCH 18/30] iomap: switch iomap_fiemap to use iomap_iter
Date: Tue, 10 Aug 2021 17:05:37 -0700	[thread overview]
Message-ID: <20210811000537.GP3601443@magnolia> (raw)
In-Reply-To: <20210809061244.1196573-19-hch@lst.de>

On Mon, Aug 09, 2021 at 08:12:32AM +0200, Christoph Hellwig wrote:
> Rewrite the ->fiemap implementation based on iomap_iter.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Nice cleanups!
Reviewed-by: Darrick J. Wong <djwong@kernel.org>

--D

> ---
>  fs/iomap/fiemap.c | 70 ++++++++++++++++++++---------------------------
>  1 file changed, 29 insertions(+), 41 deletions(-)
> 
> diff --git a/fs/iomap/fiemap.c b/fs/iomap/fiemap.c
> index aab070df4a2175..acad09a8c188df 100644
> --- a/fs/iomap/fiemap.c
> +++ b/fs/iomap/fiemap.c
> @@ -1,6 +1,6 @@
>  // SPDX-License-Identifier: GPL-2.0
>  /*
> - * Copyright (c) 2016-2018 Christoph Hellwig.
> + * Copyright (c) 2016-2021 Christoph Hellwig.
>   */
>  #include <linux/module.h>
>  #include <linux/compiler.h>
> @@ -8,13 +8,8 @@
>  #include <linux/iomap.h>
>  #include <linux/fiemap.h>
>  
> -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)
> +		const struct iomap *iomap, u32 flags)
>  {
>  	switch (iomap->type) {
>  	case IOMAP_HOLE:
> @@ -43,24 +38,22 @@ static int iomap_to_fiemap(struct fiemap_extent_info *fi,
>  			iomap->length, flags);
>  }
>  
> -static loff_t
> -iomap_fiemap_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
> -		struct iomap *iomap, struct iomap *srcmap)
> +static loff_t iomap_fiemap_iter(const struct iomap_iter *iter,
> +		struct fiemap_extent_info *fi, struct iomap *prev)
>  {
> -	struct fiemap_ctx *ctx = data;
> -	loff_t ret = length;
> +	int ret;
>  
> -	if (iomap->type == IOMAP_HOLE)
> -		return length;
> +	if (iter->iomap.type == IOMAP_HOLE)
> +		return iomap_length(iter);
>  
> -	ret = iomap_to_fiemap(ctx->fi, &ctx->prev, 0);
> -	ctx->prev = *iomap;
> +	ret = iomap_to_fiemap(fi, prev, 0);
> +	*prev = iter->iomap;
>  	switch (ret) {
>  	case 0:		/* success */
> -		return length;
> +		return iomap_length(iter);
>  	case 1:		/* extent array full */
>  		return 0;
> -	default:
> +	default:	/* error */
>  		return ret;
>  	}
>  }
> @@ -68,38 +61,33 @@ iomap_fiemap_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
>  int iomap_fiemap(struct inode *inode, struct fiemap_extent_info *fi,
>  		u64 start, u64 len, const struct iomap_ops *ops)
>  {
> -	struct fiemap_ctx ctx;
> -	loff_t ret;
> -
> -	memset(&ctx, 0, sizeof(ctx));
> -	ctx.fi = fi;
> -	ctx.prev.type = IOMAP_HOLE;
> +	struct iomap_iter iter = {
> +		.inode		= inode,
> +		.pos		= start,
> +		.len		= len,
> +		.flags		= IOMAP_REPORT,
> +	};
> +	struct iomap prev = {
> +		.type		= IOMAP_HOLE,
> +	};
> +	int ret;
>  
> -	ret = fiemap_prep(inode, fi, start, &len, 0);
> +	ret = fiemap_prep(inode, fi, start, &iter.len, 0);
>  	if (ret)
>  		return ret;
>  
> -	while (len > 0) {
> -		ret = iomap_apply(inode, start, len, IOMAP_REPORT, ops, &ctx,
> -				iomap_fiemap_actor);
> -		/* inode with no (attribute) mapping will give ENOENT */
> -		if (ret == -ENOENT)
> -			break;
> -		if (ret < 0)
> -			return ret;
> -		if (ret == 0)
> -			break;
> +	while ((ret = iomap_iter(&iter, ops)) > 0)
> +		iter.processed = iomap_fiemap_iter(&iter, fi, &prev);
>  
> -		start += ret;
> -		len -= ret;
> -	}
> -
> -	if (ctx.prev.type != IOMAP_HOLE) {
> -		ret = iomap_to_fiemap(fi, &ctx.prev, FIEMAP_EXTENT_LAST);
> +	if (prev.type != IOMAP_HOLE) {
> +		ret = iomap_to_fiemap(fi, &prev, FIEMAP_EXTENT_LAST);
>  		if (ret < 0)
>  			return ret;
>  	}
>  
> +	/* inode with no (attribute) mapping will give ENOENT */
> +	if (ret < 0 && ret != -ENOENT)
> +		return ret;
>  	return 0;
>  }
>  EXPORT_SYMBOL_GPL(iomap_fiemap);
> -- 
> 2.30.2
> 

  reply	other threads:[~2021-08-11  0:05 UTC|newest]

Thread overview: 70+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-09  6:12 switch iomap to an iterator model v2 Christoph Hellwig
2021-08-09  6:12 ` [PATCH 01/30] iomap: fix a trivial comment typo in trace.h Christoph Hellwig
2021-08-09  6:12 ` [PATCH 02/30] iomap: remove the iomap arguments to ->page_{prepare,done} Christoph Hellwig
2021-08-09  6:12 ` [PATCH 03/30] iomap: mark the iomap argument to iomap_sector const Christoph Hellwig
2021-08-09  6:12 ` [PATCH 04/30] iomap: mark the iomap argument to iomap_inline_data const Christoph Hellwig
2021-08-09 16:17   ` Darrick J. Wong
2021-08-09  6:12 ` [PATCH 05/30] iomap: mark the iomap argument to iomap_inline_data_valid const Christoph Hellwig
2021-08-09 16:17   ` Darrick J. Wong
2021-08-09  6:12 ` [PATCH 06/30] fs: mark the iomap argument to __block_write_begin_int const Christoph Hellwig
2021-08-09  6:12 ` [PATCH 07/30] fsdax: mark the iomap argument to dax_iomap_sector as const Christoph Hellwig
2021-08-19 20:35   ` Dan Williams
2021-08-09  6:12 ` [PATCH 08/30] iomap: mark the iomap argument to iomap_read_inline_data const Christoph Hellwig
2021-08-09  6:12 ` [PATCH 09/30] iomap: mark the iomap argument to iomap_read_page_sync const Christoph Hellwig
2021-08-09  6:12 ` [PATCH 10/30] iomap: fix the iomap_readpage_actor return value for inline data Christoph Hellwig
2021-08-10 23:31   ` Darrick J. Wong
2021-08-09  6:12 ` [PATCH 11/30] iomap: add the new iomap_iter model Christoph Hellwig
2021-08-09 22:10   ` Dave Chinner
2021-08-10  6:45     ` Darrick J. Wong
2021-08-10  7:13       ` Christoph Hellwig
2021-08-11  0:31   ` Darrick J. Wong
2021-08-11  5:38     ` Christoph Hellwig
2021-08-11 19:17       ` Darrick J. Wong
2021-08-12  6:49         ` Christoph Hellwig
2021-08-12 18:20           ` Darrick J. Wong
2021-08-13  7:29             ` Christoph Hellwig
2021-08-11 19:17   ` [PATCH v2.1 " Darrick J. Wong
2021-08-17  2:34     ` Dave Chinner
2021-08-19 21:25   ` [PATCH " Dan Williams
2021-08-20  4:11     ` Christoph Hellwig
2021-08-20 15:27       ` Dan Williams
2021-08-09  6:12 ` [PATCH 12/30] iomap: switch readahead and readpage to use iomap_iter Christoph Hellwig
2021-08-10 23:46   ` Darrick J. Wong
2021-08-09  6:12 ` [PATCH 13/30] iomap: switch iomap_file_buffered_write " Christoph Hellwig
2021-08-10 23:53   ` Darrick J. Wong
2021-08-09  6:12 ` [PATCH 14/30] iomap: switch iomap_file_unshare " Christoph Hellwig
2021-08-10 23:54   ` Darrick J. Wong
2021-08-09  6:12 ` [PATCH 15/30] iomap: switch iomap_zero_range " Christoph Hellwig
2021-08-10 23:54   ` Darrick J. Wong
2021-08-09  6:12 ` [PATCH 16/30] iomap: switch iomap_page_mkwrite " Christoph Hellwig
2021-08-10 23:58   ` Darrick J. Wong
2021-08-09  6:12 ` [PATCH 17/30] iomap: switch __iomap_dio_rw " Christoph Hellwig
2021-08-11  0:17   ` Darrick J. Wong
2021-08-09  6:12 ` [PATCH 18/30] iomap: switch iomap_fiemap " Christoph Hellwig
2021-08-11  0:05   ` Darrick J. Wong [this message]
2021-08-09  6:12 ` [PATCH 19/30] iomap: switch iomap_bmap " Christoph Hellwig
2021-08-10  6:39   ` Darrick J. Wong
2021-08-10  7:13     ` Christoph Hellwig
2021-08-11 19:18   ` [PATCH v2.1 " Darrick J. Wong
2021-08-12  6:50     ` Christoph Hellwig
2021-08-17  2:35     ` Dave Chinner
2021-08-09  6:12 ` [PATCH 20/30] iomap: switch iomap_seek_hole " Christoph Hellwig
2021-08-11  0:13   ` Darrick J. Wong
2021-08-09  6:12 ` [PATCH 21/30] iomap: switch iomap_seek_data " Christoph Hellwig
2021-08-11  0:12   ` Darrick J. Wong
2021-08-09  6:12 ` [PATCH 22/30] iomap: switch iomap_swapfile_activate " Christoph Hellwig
2021-08-11  0:08   ` Darrick J. Wong
2021-08-09  6:12 ` [PATCH 23/30] fsdax: switch dax_iomap_rw " Christoph Hellwig
2021-08-11  0:07   ` Darrick J. Wong
2021-08-19 21:55   ` Dan Williams
2021-08-09  6:12 ` [PATCH 24/30] iomap: remove iomap_apply Christoph Hellwig
2021-08-11 19:18   ` [PATCH v2.1 " Darrick J. Wong
2021-08-17  2:36     ` Dave Chinner
2021-08-09  6:12 ` [PATCH 25/30] iomap: pass an iomap_iter to various buffered I/O helpers Christoph Hellwig
2021-08-09  6:12 ` [PATCH 26/30] iomap: rework unshare flag Christoph Hellwig
2021-08-09  6:12 ` [PATCH 27/30] fsdax: factor out helpers to simplify the dax fault code Christoph Hellwig
2021-08-09  6:12 ` [PATCH 28/30] fsdax: factor out a dax_fault_actor() helper Christoph Hellwig
2021-08-09  6:12 ` [PATCH 29/30] fsdax: switch the fault handlers to use iomap_iter Christoph Hellwig
2021-08-09  6:12 ` [PATCH 30/30] iomap: constify iomap_iter_srcmap Christoph Hellwig
2021-08-11 19:19 ` [PATCH 31/30] iomap: move iomap iteration code to iter.c Darrick J. Wong
2021-08-17  2:37   ` Dave Chinner

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