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Commit c8bb0c8b authored by Ashish Samant's avatar Ashish Samant Committed by David Sterba
Browse files

btrfs: Cleanup compress_file_range() 



Remove unnecessary checks in compress_file_range().

Signed-off-by: default avatarAshish Samant <ashish.samant@oracle.com>
[ minor coding style fixups ]
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent 6f034ece

fs/btrfs/inode.c

+35 −37
Original line number Diff line number Diff line
@@ -585,9 +585,27 @@ static noinline void compress_file_range(struct inode *inode, 
			will_compress = 0;

		} else {

			num_bytes = total_in;

			*num_added += 1;



			/*

			 * The async work queues will take care of doing actual

			 * allocation on disk for these compressed pages, and

			 * will submit them to the elevator.

			 */

			add_async_extent(async_cow, start, num_bytes,

					total_compressed, pages, nr_pages_ret,

					compress_type);



			if (start + num_bytes < end) {

				start += num_bytes;

				pages = NULL;

				cond_resched();

				goto again;

			}

			return;

		}

	}

	if (!will_compress && pages) {

	if (pages) {

		/*

		 * the compression code ran but failed to make things smaller,

		 * free any pages it allocated and our page pointer array
@@ -607,43 +625,23 @@ static noinline void compress_file_range(struct inode *inode, 
			BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS;

		}

	}

	if (will_compress) {

		*num_added += 1;



		/* the async work queues will take care of doing actual

		 * allocation on disk for these compressed pages,

		 * and will submit them to the elevator.

		 */

		add_async_extent(async_cow, start, num_bytes,

				 total_compressed, pages, nr_pages_ret,

				 compress_type);



		if (start + num_bytes < end) {

			start += num_bytes;

			pages = NULL;

			cond_resched();

			goto again;

		}

	} else {

cleanup_and_bail_uncompressed:

	/*

		 * No compression, but we still need to write the pages in

		 * the file we've been given so far.  redirty the locked

		 * page if it corresponds to our extent and set things up

		 * for the async work queue to run cow_file_range to do

		 * the normal delalloc dance

	 * No compression, but we still need to write the pages in the file

	 * we've been given so far.  redirty the locked page if it corresponds

	 * to our extent and set things up for the async work queue to run

	 * cow_file_range to do the normal delalloc dance.

	 */

	if (page_offset(locked_page) >= start &&

		    page_offset(locked_page) <= end) {

	    page_offset(locked_page) <= end)

		__set_page_dirty_nobuffers(locked_page);

		/* unlocked later on in the async handlers */

		}



	if (redirty)

		extent_range_redirty_for_io(inode, start, end);

		add_async_extent(async_cow, start, end - start + 1,

				 0, NULL, 0, BTRFS_COMPRESS_NONE);

	add_async_extent(async_cow, start, end - start + 1, 0, NULL, 0,

			 BTRFS_COMPRESS_NONE);

	*num_added += 1;

	}



	return;