From 00fdf13a2e9f313a044288aa59d3b8ec29ff904a Mon Sep 17 00:00:00 2001 From: Liu Bo Date: Mon, 10 Mar 2014 18:56:07 +0800 Subject: [PATCH] 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: Liu Bo Signed-off-by: Chris Mason --- fs/btrfs/file.c | 15 ++++++++++++--- fs/btrfs/ioctl.c | 10 ++++++---- 2 files changed, 18 insertions(+), 7 deletions(-) diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c index b2143b8c33c5..036f506cabd8 100644 --- a/fs/btrfs/file.c +++ b/fs/btrfs/file.c @@ -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); diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 3ca313b138ca..6778fa3c6ed2 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -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 */ -- 2.30.2