From 4c2bf276b56d8d27ddbafcdf056ef3fc60ae50b0 Mon Sep 17 00:00:00 2001
From: David Sterba <dsterba@suse.com>
Date: Tue, 15 Jun 2021 17:15:38 +0200
Patch-mainline: v5.15-rc1
References: jsc#SLE-17681
Git-commit: 4c2bf276b56d8d27ddbafcdf056ef3fc60ae50b0
Subject: [PATCH 5/6] btrfs: compression: drop kmap/kunmap from generic helpers

The pages in compressed_pages are not from highmem anymore so we can
drop the mapping for checksum calculation and inline extent.

Signed-off-by: David Sterba <dsterba@suse.com>
---
 fs/btrfs/compression.c | 3 +--
 fs/btrfs/inode.c       | 3 +--
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c
index 49fdec423092..aeda426b6121 100644
--- a/fs/btrfs/compression.c
+++ b/fs/btrfs/compression.c
@@ -172,10 +172,9 @@ static int check_compressed_csum(struct btrfs_inode *inode, struct bio *bio,
 		/* Hash through the page sector by sector */
 		for (pg_offset = 0; pg_offset < bytes_left;
 		     pg_offset += sectorsize) {
-			kaddr = kmap_atomic(page);
+			kaddr = page_address(page);
 			crypto_shash_digest(shash, kaddr + pg_offset,
 					    sectorsize, csum);
-			kunmap_atomic(kaddr);
 
 			if (memcmp(&csum, cb_sum, csum_size) != 0) {
 				btrfs_print_data_csum_error(inode, disk_start,
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 06f9f167222b..c84d42a290c6 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -286,9 +286,8 @@ static int insert_inline_extent(struct btrfs_trans_handle *trans,
 			cur_size = min_t(unsigned long, compressed_size,
 				       PAGE_SIZE);
 
-			kaddr = kmap_atomic(cpage);
+			kaddr = page_address(cpage);
 			write_extent_buffer(leaf, kaddr, ptr, cur_size);
-			kunmap_atomic(kaddr);
 
 			i++;
 			ptr += cur_size;
-- 
2.33.0