[PATCH v2 14/17] btrfs: remove buffered IO stripe boundary calculation

[Qu Wenruo <wqu@suse.com>]

This will remove btrfs_bio_ctrl::len_to_stripe_boundary, so that buffer
IO will no longer limits its bio size according to stripe length.

This will move the bio split to btrfs_map_bio() for all buffered IO.

Signed-off-by: Qu Wenruo <wqu@suse.com>
---
 fs/btrfs/extent_io.c | 23 ++---------------------
 1 file changed, 2 insertions(+), 21 deletions(-)

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index cb99b55ccf87..97045927b763 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -3307,7 +3307,7 @@ static int btrfs_bio_add_page(struct btrfs_bio_ctrl *bio_ctrl,
 
 	ASSERT(bio);
 	/* The limit should be calculated when bio_ctrl->bio is allocated */
-	ASSERT(bio_ctrl->len_to_oe_boundary && bio_ctrl->len_to_stripe_boundary);
+	ASSERT(bio_ctrl->len_to_oe_boundary);
 	if (bio_ctrl->bio_flags != bio_flags)
 		return 0;
 
@@ -3318,9 +3318,7 @@ static int btrfs_bio_add_page(struct btrfs_bio_ctrl *bio_ctrl,
 	if (!contig)
 		return 0;
 
-	real_size = min(bio_ctrl->len_to_oe_boundary,
-			bio_ctrl->len_to_stripe_boundary) - bio_size;
-	real_size = min(real_size, size);
+	real_size = min(bio_ctrl->len_to_oe_boundary - bio_size, size);
 
 	/*
 	 * If real_size is 0, never call bio_add_*_page(), as even size is 0,
@@ -3341,11 +3339,8 @@ static int calc_bio_boundaries(struct btrfs_bio_ctrl *bio_ctrl,
 			       struct btrfs_inode *inode, u64 file_offset)
 {
 	struct btrfs_fs_info *fs_info = inode->root->fs_info;
-	struct btrfs_io_geometry geom;
 	struct btrfs_ordered_extent *ordered;
-	struct extent_map *em;
 	u64 logical = (bio_ctrl->bio->bi_iter.bi_sector << SECTOR_SHIFT);
-	int ret;
 
 	/*
 	 * Pages for compressed extent are never submitted to disk directly,
@@ -3356,22 +3351,8 @@ static int calc_bio_boundaries(struct btrfs_bio_ctrl *bio_ctrl,
 	 */
 	if (bio_ctrl->bio_flags & EXTENT_BIO_COMPRESSED) {
 		bio_ctrl->len_to_oe_boundary = U32_MAX;
-		bio_ctrl->len_to_stripe_boundary = U32_MAX;
 		return 0;
 	}
-	em = btrfs_get_chunk_map(fs_info, logical, fs_info->sectorsize);
-	if (IS_ERR(em))
-		return PTR_ERR(em);
-	ret = btrfs_get_io_geometry(fs_info, em, btrfs_op(bio_ctrl->bio),
-				    logical, &geom);
-	free_extent_map(em);
-	if (ret < 0) {
-		return ret;
-	}
-	if (geom.len > U32_MAX)
-		bio_ctrl->len_to_stripe_boundary = U32_MAX;
-	else
-		bio_ctrl->len_to_stripe_boundary = (u32)geom.len;
 
 	if (!btrfs_is_zoned(fs_info) ||
 	    bio_op(bio_ctrl->bio) != REQ_OP_ZONE_APPEND) {
-- 
2.34.1