From 3e0c847ef1ae98e2fc47f15f47184d4b35385f5b Mon Sep 17 00:00:00 2001 From: Josef Bacik Date: Thu, 31 Oct 2013 16:49:02 -0400 Subject: [PATCH] Btrfs: check file extent type before anything else I hit this problem with my no holes patch and it made me realize what the problem was for bz 60834. If the first item in the leaf is an inline extent and we try to read anything starting from disk_bytenr onward we will read off the end of the leaf. So we need to check to see what it's type is, and if it's not REG we can just break out. This should fix this problem. Thanks, Signed-off-by: Josef Bacik Signed-off-by: Chris Mason --- fs/btrfs/send.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c index ec2f02435287f..6837fe87f3a6b 100644 --- a/fs/btrfs/send.c +++ b/fs/btrfs/send.c @@ -3902,16 +3902,16 @@ static int is_extent_unchanged(struct send_ctx *sctx, while (key.offset < ekey->offset + left_len) { ei = btrfs_item_ptr(eb, slot, struct btrfs_file_extent_item); right_type = btrfs_file_extent_type(eb, ei); - right_disknr = btrfs_file_extent_disk_bytenr(eb, ei); - right_len = btrfs_file_extent_num_bytes(eb, ei); - right_offset = btrfs_file_extent_offset(eb, ei); - right_gen = btrfs_file_extent_generation(eb, ei); - if (right_type != BTRFS_FILE_EXTENT_REG) { ret = 0; goto out; } + right_disknr = btrfs_file_extent_disk_bytenr(eb, ei); + right_len = btrfs_file_extent_num_bytes(eb, ei); + right_offset = btrfs_file_extent_offset(eb, ei); + right_gen = btrfs_file_extent_generation(eb, ei); + /* * Are we at extent 8? If yes, we know the extent is changed. * This may only happen on the first iteration. -- 2.39.5