From 78fa177029802f7f10953d357067171f39a79b81 Mon Sep 17 00:00:00 2001 From: Zhao Lei Date: Mon, 20 Jul 2015 17:54:50 +0800 Subject: [PATCH] btrfs: Show detail information when mount failed on missing devices When mount failed because missing device, we can see following dmesg: [ 1060.267743] BTRFS: too many missing devices, writeable mount is not allowed [ 1060.273158] BTRFS: open_ctree failed This patch add missing_device_number and tolerated_missing_device_number to above output, to let user know what really happened, and helps bug-report and debug. dmesg after patch: [ 127.050367] BTRFS: missing devices(1) exceeds the limit(0), writeable mount is not allowed [ 127.056099] BTRFS: open_ctree failed Changelog v1->v2: 1: Changed to more clear description, suggested-by: Anand Jain Suggested-by: Anand Jain Signed-off-by: Zhao Lei Reviewed-by: Anand Jain Signed-off-by: Chris Mason --- fs/btrfs/disk-io.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index f556c3732c2c..e49ae5ea9040 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -2950,8 +2950,9 @@ retry_root_backup: if (fs_info->fs_devices->missing_devices > fs_info->num_tolerated_disk_barrier_failures && !(sb->s_flags & MS_RDONLY)) { - printk(KERN_WARNING "BTRFS: " - "too many missing devices, writeable mount is not allowed\n"); + pr_warn("BTRFS: missing devices(%llu) exceeds the limit(%d), writeable mount is not allowed\n", + fs_info->fs_devices->missing_devices, + fs_info->num_tolerated_disk_barrier_failures); goto fail_sysfs; } -- 2.20.1