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From: Goldwyn Rodrigues <rgoldwyn@suse.de>
To: linux-fsdevel@vger.kernel.org
Cc: linux-btrfs@vger.kernel.org, hch@lst.de, darrick.wong@oracle.com,
	ruansy.fnst@cn.fujitsu.com, Goldwyn Rodrigues <rgoldwyn@suse.com>
Subject: [PATCH 08/13] btrfs: Carve out btrfs_get_extent_map_write() out of btrfs_get_blocks_write()
Date: Fri,  2 Aug 2019 17:00:43 -0500	[thread overview]
Message-ID: <20190802220048.16142-9-rgoldwyn@suse.de> (raw)
In-Reply-To: <20190802220048.16142-1-rgoldwyn@suse.de>

From: Goldwyn Rodrigues <rgoldwyn@suse.com>

This makes btrfs_get_extent_map_write() independent of Direct
I/O code.

Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
---
 fs/btrfs/ctree.h |  2 ++
 fs/btrfs/inode.c | 40 +++++++++++++++++++++++++++-------------
 2 files changed, 29 insertions(+), 13 deletions(-)

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 9eca2d576dd1..66232cbc2414 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -3172,6 +3172,8 @@ struct inode *btrfs_iget_path(struct super_block *s, struct btrfs_key *location,
 			      struct btrfs_path *path);
 struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location,
 			 struct btrfs_root *root, int *was_new);
+int btrfs_get_extent_map_write(struct extent_map **map, struct buffer_head *bh,
+		struct inode *inode, u64 start, u64 len);
 struct extent_map *btrfs_get_extent(struct btrfs_inode *inode,
 				    struct page *page, size_t pg_offset,
 				    u64 start, u64 end, int create);
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 258bacefdf5f..24895793fd91 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -7592,11 +7592,10 @@ static int btrfs_get_blocks_direct_read(struct extent_map *em,
 	return 0;
 }
 
-static int btrfs_get_blocks_direct_write(struct extent_map **map,
-					 struct buffer_head *bh_result,
-					 struct inode *inode,
-					 struct btrfs_dio_data *dio_data,
-					 u64 start, u64 len)
+int btrfs_get_extent_map_write(struct extent_map **map,
+		struct buffer_head *bh,
+		struct inode *inode,
+		u64 start, u64 len)
 {
 	struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
 	struct extent_map *em = *map;
@@ -7650,22 +7649,38 @@ static int btrfs_get_blocks_direct_write(struct extent_map **map,
 			 */
 			btrfs_free_reserved_data_space_noquota(inode, start,
 							       len);
-			goto skip_cow;
+			/* skip COW */
+			goto out;
 		}
 	}
 
 	/* this will cow the extent */
-	len = bh_result->b_size;
+	if (bh)
+		len = bh->b_size;
 	free_extent_map(em);
 	*map = em = btrfs_new_extent_direct(inode, start, len);
-	if (IS_ERR(em)) {
-		ret = PTR_ERR(em);
-		goto out;
-	}
+	if (IS_ERR(em))
+		return PTR_ERR(em);
+out:
+	return ret;
+}
 
+static int btrfs_get_blocks_direct_write(struct extent_map **map,
+					 struct buffer_head *bh_result,
+					 struct inode *inode,
+					 struct btrfs_dio_data *dio_data,
+					 u64 start, u64 len)
+{
+	int ret;
+	struct extent_map *em;
+
+	ret = btrfs_get_extent_map_write(map, bh_result, inode,
+			start, len);
+	if (ret < 0)
+		return ret;
+	em = *map;
 	len = min(len, em->len - (start - em->start));
 
-skip_cow:
 	bh_result->b_blocknr = (em->block_start + (start - em->start)) >>
 		inode->i_blkbits;
 	bh_result->b_size = len;
@@ -7686,7 +7701,6 @@ static int btrfs_get_blocks_direct_write(struct extent_map **map,
 	dio_data->reserve -= len;
 	dio_data->unsubmitted_oe_range_end = start + len;
 	current->journal_info = dio_data;
-out:
 	return ret;
 }
 
-- 
2.16.4


  parent reply	other threads:[~2019-08-02 22:01 UTC|newest]

Thread overview: 45+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-02 22:00 [PATCH v2 0/13] Btrfs iomap Goldwyn Rodrigues
2019-08-02 22:00 ` [PATCH 01/13] iomap: Use a IOMAP_COW/srcmap for a read-modify-write I/O Goldwyn Rodrigues
2019-08-03  0:39   ` Darrick J. Wong
2019-08-05  0:06   ` Dave Chinner
2019-08-02 22:00 ` [PATCH 02/13] iomap: Read page from srcmap for IOMAP_COW Goldwyn Rodrigues
2019-08-03  0:23   ` Darrick J. Wong
2019-08-04 23:52   ` Dave Chinner
2019-08-02 22:00 ` [PATCH 03/13] btrfs: Eliminate PagePrivate for btrfs data pages Goldwyn Rodrigues
2019-08-02 22:00 ` [PATCH 04/13] btrfs: Add a simple buffered iomap write Goldwyn Rodrigues
2019-08-05  0:11   ` Dave Chinner
2019-08-22 15:05     ` Goldwyn Rodrigues
2019-08-02 22:00 ` [PATCH 05/13] btrfs: Add CoW in iomap based writes Goldwyn Rodrigues
2019-08-05  0:13   ` Dave Chinner
2019-08-22 15:01     ` Goldwyn Rodrigues
2019-08-02 22:00 ` [PATCH 06/13] btrfs: remove buffered write code made unnecessary Goldwyn Rodrigues
2019-08-02 22:00 ` [PATCH 07/13] btrfs: basic direct read operation Goldwyn Rodrigues
2019-08-12 12:32   ` RITESH HARJANI
2019-08-22 15:00     ` Goldwyn Rodrigues
2019-08-02 22:00 ` Goldwyn Rodrigues [this message]
2019-08-02 22:00 ` [PATCH 09/13] btrfs: Rename __endio_write_update_ordered() to btrfs_update_ordered_extent() Goldwyn Rodrigues
2019-08-02 22:00 ` [PATCH 10/13] iomap: use a function pointer for dio submits Goldwyn Rodrigues
2019-08-03  0:21   ` Darrick J. Wong
2019-08-05 16:08     ` Goldwyn Rodrigues
2019-08-04 23:43   ` Dave Chinner
2019-08-05 16:08     ` Goldwyn Rodrigues
2019-08-05 21:54       ` Dave Chinner
2019-08-08  4:26         ` Gao Xiang
2019-08-08  4:52           ` Gao Xiang
2019-08-08  5:49           ` Eric Biggers
2019-08-08  6:28             ` Gao Xiang
2019-08-08  8:16             ` Dave Chinner
2019-08-08  8:57               ` Gao Xiang
2019-08-08  9:29               ` Gao Xiang
2019-08-08 11:21                 ` Gao Xiang
2019-08-08 13:11                   ` Gao Xiang
2019-08-09 20:45             ` Matthew Wilcox
2019-08-09 23:45               ` Gao Xiang
2019-08-10  0:31                 ` Eric Biggers
2019-08-10  0:50                   ` Eric Biggers
2019-08-10  1:34                     ` Gao Xiang
2019-08-10  1:13                   ` Gao Xiang
2019-08-10  0:17               ` Eric Biggers
2019-08-02 22:00 ` [PATCH 11/13] btrfs: Use iomap_dio_rw for performing direct I/O writes Goldwyn Rodrigues
2019-08-02 22:00 ` [PATCH 12/13] btrfs: Remove btrfs_dio_data and __btrfs_direct_write Goldwyn Rodrigues
2019-08-02 22:00 ` [PATCH 13/13] btrfs: update inode size during bio completion Goldwyn Rodrigues

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