btrfs: send: in case of IO error log it

commit 2e7be9db125a0bf940c5d65eb5c40d8700f738b5 upstream.

Currently if we get IO error while doing send then we abort without
logging information about which file caused issue.  So log it to help
with debugging.

CC: stable@vger.kernel.org # 4.9+
Signed-off-by: Dāvis Mosāns <davispuh@gmail.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c
index 080b12d65b0cbe64eb18f116366a6aa32eaac286..35dea3f86fdfa2cffdb7174879423270dbeb2da2 100644 (file)
--- a/fs/btrfs/send.c
+++ b/fs/btrfs/send.c
@@ -4675,6 +4675,10 @@ static ssize_t fill_read_buf(struct send_ctx *sctx, u64 offset, u32 len)
                        lock_page(page);
                        if (!PageUptodate(page)) {
                                unlock_page(page);
+                               btrfs_err(fs_info,
+                       "send: IO error at offset %llu for inode %llu root %llu",
+                                       page_offset(page), sctx->cur_ino,
+                                       sctx->send_root->root_key.objectid);
                                put_page(page);
                                ret = -EIO;
                                break;