btrfs: use PAGE_{ALIGN, ALIGNED, ALIGN_DOWN} macro

The header file linux/mm.h provides PAGE_ALIGN, PAGE_ALIGNED,
PAGE_ALIGN_DOWN macros. Use these macros to make code more
concise.
Signed-off-by: Yushan Zhou <katrinzhou@tencent.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/compression.c

@@ -1609,7 +1609,7 @@ static void heuristic_collect_sample(struct inode *inode, u64 start, u64 end,
 	index_end = end >> PAGE_SHIFT;
 
 	/* Don't miss unaligned end */
-	if (!IS_ALIGNED(end, PAGE_SIZE))
+	if (!PAGE_ALIGNED(end))
 		index_end++;
 
 	curr_sample_pos = 0;

fs/btrfs/defrag.c

@@ -999,7 +999,7 @@ static int defrag_collect_targets(struct btrfs_inode *inode,
 }
 
 #define CLUSTER_SIZE	(SZ_256K)
-static_assert(IS_ALIGNED(CLUSTER_SIZE, PAGE_SIZE));
+static_assert(PAGE_ALIGNED(CLUSTER_SIZE));
 
 /*
  * Defrag one contiguous target range.

fs/btrfs/inode.c

@@ -10995,9 +10995,8 @@ static int btrfs_add_swap_extent(struct swap_info_struct *sis,
 		return 0;
 
 	max_pages = sis->max - bsi->nr_pages;
-	first_ppage = ALIGN(bsi->block_start, PAGE_SIZE) >> PAGE_SHIFT;
-	next_ppage = ALIGN_DOWN(bsi->block_start + bsi->block_len,
-				PAGE_SIZE) >> PAGE_SHIFT;
+	first_ppage = PAGE_ALIGN(bsi->block_start) >> PAGE_SHIFT;
+	next_ppage = PAGE_ALIGN_DOWN(bsi->block_start + bsi->block_len) >> PAGE_SHIFT;
 
 	if (first_ppage >= next_ppage)
 		return 0;

fs/btrfs/lzo.c

@@ -280,7 +280,7 @@ int lzo_compress_pages(struct list_head *ws, struct address_space *mapping,
 		}
 
 		/* Check if we have reached page boundary */
-		if (IS_ALIGNED(cur_in, PAGE_SIZE)) {
+		if (PAGE_ALIGNED(cur_in)) {
 			put_page(page_in);
 			page_in = NULL;
 		}

fs/btrfs/relocation.c

@@ -2825,7 +2825,7 @@ static noinline_for_stack int prealloc_file_extent_cluster(
 	 *
 	 * Here we have to manually invalidate the range (i_size, PAGE_END + 1).
 	 */
-	if (!IS_ALIGNED(i_size, PAGE_SIZE)) {
+	if (!PAGE_ALIGNED(i_size)) {
 		struct address_space *mapping = inode->vfs_inode.i_mapping;
 		struct btrfs_fs_info *fs_info = inode->root->fs_info;
 		const u32 sectorsize = fs_info->sectorsize;

fs/btrfs/send.c

@@ -5633,7 +5633,7 @@ static int send_encoded_extent(struct send_ctx *sctx, struct btrfs_path *path,
 	 * boundary in the send buffer. This means that there may be a gap
 	 * between the beginning of the command and the file data.
 	 */
-	data_offset = ALIGN(sctx->send_size, PAGE_SIZE);
+	data_offset = PAGE_ALIGN(sctx->send_size);
 	if (data_offset > sctx->send_max_size ||
 	    sctx->send_max_size - data_offset < disk_num_bytes) {
 		ret = -EOVERFLOW;
@@ -5757,7 +5757,7 @@ static int send_extent_data(struct send_ctx *sctx, struct btrfs_path *path,
 		sent += size;
 	}
 
-	if (sctx->clean_page_cache && IS_ALIGNED(end, PAGE_SIZE)) {
+	if (sctx->clean_page_cache && PAGE_ALIGNED(end)) {
 		/*
 		 * Always operate only on ranges that are a multiple of the page
 		 * size. This is not only to prevent zeroing parts of a page in