Patch "btrfs: factor out stripe length calculation into a helper" has been added to the 6.10-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    btrfs: factor out stripe length calculation into a helper

to the 6.10-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     btrfs-factor-out-stripe-length-calculation-into-a-he.patch
and it can be found in the queue-6.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit d2d9405944529708da21473429391035884b7978
Author: Qu Wenruo <wqu@xxxxxxxx>
Date:   Fri Mar 8 13:40:30 2024 +1030

    btrfs: factor out stripe length calculation into a helper
    
    [ Upstream commit 33eb1e5db351e2c0e652d878b66b8a6d4d013135 ]
    
    Currently there are two locations which need to calculate the real
    length of a stripe (which can be at the end of a chunk, and the chunk
    size may not always be 64K aligned).
    
    Factor them into a helper as we're going to have a third user soon.
    
    Reviewed-by: Johannes Thumshirn <johannes.thumshirn@xxxxxxx>
    Signed-off-by: Qu Wenruo <wqu@xxxxxxxx>
    Reviewed-by: David Sterba <dsterba@xxxxxxxx>
    Signed-off-by: David Sterba <dsterba@xxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index d7caa3732f074..9712169593980 100644
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -1648,14 +1648,20 @@ static void scrub_reset_stripe(struct scrub_stripe *stripe)
 	}
 }
 
+static u32 stripe_length(const struct scrub_stripe *stripe)
+{
+	ASSERT(stripe->bg);
+
+	return min(BTRFS_STRIPE_LEN,
+		   stripe->bg->start + stripe->bg->length - stripe->logical);
+}
+
 static void scrub_submit_extent_sector_read(struct scrub_ctx *sctx,
 					    struct scrub_stripe *stripe)
 {
 	struct btrfs_fs_info *fs_info = stripe->bg->fs_info;
 	struct btrfs_bio *bbio = NULL;
-	unsigned int nr_sectors = min(BTRFS_STRIPE_LEN, stripe->bg->start +
-				      stripe->bg->length - stripe->logical) >>
-				  fs_info->sectorsize_bits;
+	unsigned int nr_sectors = stripe_length(stripe) >> fs_info->sectorsize_bits;
 	u64 stripe_len = BTRFS_STRIPE_LEN;
 	int mirror = stripe->mirror_num;
 	int i;
@@ -1729,9 +1735,7 @@ static void scrub_submit_initial_read(struct scrub_ctx *sctx,
 {
 	struct btrfs_fs_info *fs_info = sctx->fs_info;
 	struct btrfs_bio *bbio;
-	unsigned int nr_sectors = min(BTRFS_STRIPE_LEN, stripe->bg->start +
-				      stripe->bg->length - stripe->logical) >>
-				  fs_info->sectorsize_bits;
+	unsigned int nr_sectors = stripe_length(stripe) >> fs_info->sectorsize_bits;
 	int mirror = stripe->mirror_num;
 
 	ASSERT(stripe->bg);