btrfs: remove PAGE_SET_ERROR

Now that the btrfs writeback code has stopped using PageError, using
PAGE_SET_ERROR to just set the per-address_space error flag is confusing.
Open code the mapping_set_error calls in the callers and remove
the PAGE_SET_ERROR flag.
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/extent_io.c

@@ -268,9 +268,6 @@ static int __process_pages_contig(struct address_space *mapping,
 		ASSERT(processed_end && *processed_end == start);
 	}
 
-	if ((page_ops & PAGE_SET_ERROR) && start_index <= end_index)
-		mapping_set_error(mapping, -EIO);
-
 	folio_batch_init(&fbatch);
 	while (index <= end_index) {
 		int found_folios;

fs/btrfs/extent_io.h

@@ -40,7 +40,6 @@ enum {
 	ENUM_BIT(PAGE_START_WRITEBACK),
 	ENUM_BIT(PAGE_END_WRITEBACK),
 	ENUM_BIT(PAGE_SET_ORDERED),
-	ENUM_BIT(PAGE_SET_ERROR),
 	ENUM_BIT(PAGE_LOCK),
 };
 

fs/btrfs/inode.c

@@ -835,6 +835,7 @@ static noinline int compress_file_range(struct async_chunk *async_chunk)
 {
 	struct btrfs_inode *inode = async_chunk->inode;
 	struct btrfs_fs_info *fs_info = inode->root->fs_info;
+	struct address_space *mapping = inode->vfs_inode.i_mapping;
 	u64 blocksize = fs_info->sectorsize;
 	u64 start = async_chunk->start;
 	u64 end = async_chunk->end;
@@ -949,7 +950,7 @@ static noinline int compress_file_range(struct async_chunk *async_chunk)
 		/* Compression level is applied here and only here */
 		ret = btrfs_compress_pages(
 			compress_type | (fs_info->compress_level << 4),
-					   inode->vfs_inode.i_mapping, start,
+					   mapping, start,
 					   pages,
 					   &nr_pages,
 					   &total_in,
@@ -992,9 +993,9 @@ static noinline int compress_file_range(struct async_chunk *async_chunk)
 			unsigned long clear_flags = EXTENT_DELALLOC |
 				EXTENT_DELALLOC_NEW | EXTENT_DEFRAG |
 				EXTENT_DO_ACCOUNTING;
-			unsigned long page_error_op;
 
-			page_error_op = ret < 0 ? PAGE_SET_ERROR : 0;
+			if (ret < 0)
+				mapping_set_error(mapping, -EIO);
 
 			/*
 			 * inline extent creation worked or returned error,
@@ -1011,7 +1012,6 @@ static noinline int compress_file_range(struct async_chunk *async_chunk)
 						     clear_flags,
 						     PAGE_UNLOCK |
 						     PAGE_START_WRITEBACK |
-						     page_error_op |
 						     PAGE_END_WRITEBACK);
 
 			/*
@@ -1271,12 +1271,13 @@ static int submit_one_async_extent(struct btrfs_inode *inode,
 	btrfs_dec_block_group_reservations(fs_info, ins.objectid);
 	btrfs_free_reserved_extent(fs_info, ins.objectid, ins.offset, 1);
 out_free:
+	mapping_set_error(inode->vfs_inode.i_mapping, -EIO);
 	extent_clear_unlock_delalloc(inode, start, end,
 				     NULL, EXTENT_LOCKED | EXTENT_DELALLOC |
 				     EXTENT_DELALLOC_NEW |
 				     EXTENT_DEFRAG | EXTENT_DO_ACCOUNTING,
 				     PAGE_UNLOCK | PAGE_START_WRITEBACK |
-				     PAGE_END_WRITEBACK | PAGE_SET_ERROR);
+				     PAGE_END_WRITEBACK);
 	free_async_extent_pages(async_extent);
 	goto done;
 }