From: David Sterba <dsterba@suse.com>
Date: Tue, 15 Jun 2021 15:15:38 +0000 (+0200)
Subject: btrfs: compression: drop kmap/kunmap from generic helpers
X-Git-Tag: accepted/tizen/unified/20230118.172025~6109^2~125
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=4c2bf276b56d8d27ddbafcdf056ef3fc60ae50b0;p=platform%2Fkernel%2Flinux-rpi.git

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>
---

diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c
index 49fdec4..aeda426 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 06f9f16..c84d42a 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;