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Commit 00fdf13a authored by Liu Bo's avatar Liu Bo Committed by Chris Mason
Browse files

Btrfs: fix a crash of clone with inline extents's split 



xfstests's btrfs/035 triggers a BUG_ON, which we use to detect the split
of inline extents in __btrfs_drop_extents().

For inline extents, we cannot duplicate another EXTENT_DATA item, because
it breaks the rule of inline extents, that is, 'start offset' needs to be 0.

We have set limitations for the source inode's compressed inline extents,
because it needs to decompress and recompress.  Now the destination inode's
inline extents also need similar limitations.

With this, xfstests btrfs/035 doesn't run into panic.

Signed-off-by: default avatarLiu Bo <bo.li.liu@oracle.com>
Signed-off-by: default avatarChris Mason <clm@fb.com>
parent 73b802f4

fs/btrfs/file.c

+12 −3
Original line number Diff line number Diff line
@@ -804,7 +804,10 @@ next_slot: 
		 */

		if (start > key.offset && end < extent_end) {

			BUG_ON(del_nr > 0);

			BUG_ON(extent_type == BTRFS_FILE_EXTENT_INLINE);

			if (extent_type == BTRFS_FILE_EXTENT_INLINE) {

				ret = -EINVAL;

				break;

			}



			memcpy(&new_key, &key, sizeof(new_key));

			new_key.offset = start;
@@ -847,7 +850,10 @@ next_slot: 
		 *      | -------- extent -------- |

		 */

		if (start <= key.offset && end < extent_end) {

			BUG_ON(extent_type == BTRFS_FILE_EXTENT_INLINE);

			if (extent_type == BTRFS_FILE_EXTENT_INLINE) {

				ret = -EINVAL;

				break;

			}



			memcpy(&new_key, &key, sizeof(new_key));

			new_key.offset = end;
@@ -870,7 +876,10 @@ next_slot: 
		 */

		if (start > key.offset && end >= extent_end) {

			BUG_ON(del_nr > 0);

			BUG_ON(extent_type == BTRFS_FILE_EXTENT_INLINE);

			if (extent_type == BTRFS_FILE_EXTENT_INLINE) {

				ret = -EINVAL;

				break;

			}



			btrfs_set_file_extent_num_bytes(leaf, fi,

							start - key.offset);

fs/btrfs/ioctl.c

+6 −4
Original line number Diff line number Diff line
@@ -3087,8 +3087,9 @@ process_slot: 
							 new_key.offset + datal,

							 1);

				if (ret) {

					btrfs_abort_transaction(trans, root,

								ret);

					if (ret != -EINVAL)

						btrfs_abort_transaction(trans,

								root, ret);

					btrfs_end_transaction(trans, root);

					goto out;

				}
@@ -3246,8 +3247,9 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, 
	 *   decompress into destination's address_space (the file offset

	 *   may change, so source mapping won't do), then recompress (or

	 *   otherwise reinsert) a subrange.

	 * - allow ranges within the same file to be cloned (provided

	 *   they don't overlap)?

	 *

	 * - split destination inode's inline extents.  The inline extents can

	 *   be either compressed or non-compressed.

	 */



	/* the destination must be opened for writing */