Commit fe3f566c authored by Li Zefan's avatar Li Zefan Committed by Chris Mason
Browse files

Btrfs: Fix oops for defrag with compression turned on 



When we defrag a file, whose size can be fit into an inline extent,
with compression enabled, the compress type is set to be
fs_info->compress_type, which is 0 if the btrfs filesystem is mounted
without compress option. This leads to oops.

Reported-by: default avatarDaniel Blueman <daniel.blueman@gmail.com>
Signed-off-by: default avatarLi Zefan <lizf@cn.fujitsu.com>
Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
parent 200da64e

fs/btrfs/inode.c

+8 −9
Original line number Diff line number Diff line
@@ -111,6 +111,7 @@ static int btrfs_init_inode_security(struct btrfs_trans_handle *trans, 
static noinline int insert_inline_extent(struct btrfs_trans_handle *trans,

				struct btrfs_root *root, struct inode *inode,

				u64 start, size_t size, size_t compressed_size,

				int compress_type,

				struct page **compressed_pages)

{

	struct btrfs_key key;
@@ -125,12 +126,9 @@ static noinline int insert_inline_extent(struct btrfs_trans_handle *trans, 
	size_t cur_size = size;

	size_t datasize;

	unsigned long offset;

	int compress_type = BTRFS_COMPRESS_NONE;



	if (compressed_size && compressed_pages) {

		compress_type = root->fs_info->compress_type;

	if (compressed_size && compressed_pages)

		cur_size = compressed_size;

	}



	path = btrfs_alloc_path();

	if (!path)
@@ -220,7 +218,7 @@ fail: 
static noinline int cow_file_range_inline(struct btrfs_trans_handle *trans,

				 struct btrfs_root *root,

				 struct inode *inode, u64 start, u64 end,

				 size_t compressed_size,

				 size_t compressed_size, int compress_type,

				 struct page **compressed_pages)

{

	u64 isize = i_size_read(inode);
@@ -253,7 +251,7 @@ static noinline int cow_file_range_inline(struct btrfs_trans_handle *trans, 
		inline_len = min_t(u64, isize, actual_end);

	ret = insert_inline_extent(trans, root, inode, start,

				   inline_len, compressed_size,

				   compressed_pages);

				   compress_type, compressed_pages);

	BUG_ON(ret);

	btrfs_delalloc_release_metadata(inode, end + 1 - start);

	btrfs_drop_extent_cache(inode, start, aligned_end - 1, 0);
@@ -432,12 +430,13 @@ again: 
			 * to make an uncompressed inline extent.

			 */

			ret = cow_file_range_inline(trans, root, inode,

						    start, end, 0, NULL);

						    start, end, 0, 0, NULL);

		} else {

			/* try making a compressed inline extent */

			ret = cow_file_range_inline(trans, root, inode,

						    start, end,

						    total_compressed, pages);

						    total_compressed,

						    compress_type, pages);

		}

		if (ret == 0) {

			/*
@@ -791,7 +790,7 @@ static noinline int cow_file_range(struct inode *inode, 
	if (start == 0) {

		/* lets try to make an inline extent */

		ret = cow_file_range_inline(trans, root, inode,

					    start, end, 0, NULL);

					    start, end, 0, 0, NULL);

		if (ret == 0) {

			extent_clear_unlock_delalloc(inode,

				     &BTRFS_I(inode)->io_tree,

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