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 (file)
--- 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 (file)
--- 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;