linux-kernel - [PATCH 4.9 06/33] btrfs: send: in case of IO error log it

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Message-Id: <20220221084908.769515115@linuxfoundation.org>
Date:   Mon, 21 Feb 2022 09:48:59 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Dāvis Mosāns <davispuh@...il.com>,
        David Sterba <dsterba@...e.com>
Subject: [PATCH 4.9 06/33] btrfs: send: in case of IO error log it

From: Dāvis Mosāns <davispuh@...il.com>

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@...r.kernel.org # 4.9+
Signed-off-by: Dāvis Mosāns <davispuh@...il.com>
Reviewed-by: David Sterba <dsterba@...e.com>
Signed-off-by: David Sterba <dsterba@...e.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/btrfs/send.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/fs/btrfs/send.c
+++ b/fs/btrfs/send.c
@@ -4675,6 +4675,10 @@ static ssize_t fill_read_buf(struct send
 			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;