From 3f26d9b257ad776be8895fc87df941210903281e Mon Sep 17 00:00:00 2001 From: Qu Wenruo Date: Thu, 2 Nov 2023 07:54:50 +1030 Subject: [PATCH] btrfs: add dmesg output for first mount and last unmount of a filesystem commit 2db313205f8b96eea467691917138d646bb50aef upstream. There is a feature request to add dmesg output when unmounting a btrfs. There are several alternative methods to do the same thing, but with their own problems: - Use eBPF to watch btrfs_put_super()/open_ctree() Not end user friendly, they have to dip their head into the source code. - Watch for directory /sys/fs// This is way more simple, but still requires some simple device -> uuid lookups. And a script needs to use inotify to watch /sys/fs/. Compared to all these, directly outputting the information into dmesg would be the most simple one, with both device and UUID included. And since we're here, also add the output when mounting a filesystem for the first time for parity. A more fine grained monitoring of subvolume mounts should be done by another layer, like audit. Now mounting a btrfs with all default mkfs options would look like this: [81.906566] BTRFS info (device dm-8): first mount of filesystem 633b5c16-afe3-4b79-b195-138fe145e4f2 [81.907494] BTRFS info (device dm-8): using crc32c (crc32c-intel) checksum algorithm [81.908258] BTRFS info (device dm-8): using free space tree [81.912644] BTRFS info (device dm-8): auto enabling async discard [81.913277] BTRFS info (device dm-8): checking UUID tree [91.668256] BTRFS info (device dm-8): last unmount of filesystem 633b5c16-afe3-4b79-b195-138fe145e4f2 CC: stable@vger.kernel.org # 5.4+ Link: https://github.com/kdave/btrfs-progs/issues/689 Reviewed-by: Anand Jain Signed-off-by: Qu Wenruo Reviewed-by: David Sterba [ update changelog ] Signed-off-by: David Sterba Signed-off-by: Greg Kroah-Hartman --- fs/btrfs/disk-io.c | 1 + fs/btrfs/super.c | 5 ++++- 2 files changed, 5 insertions(+), 1 deletion(-) diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index d1dae29a3d01..40152458e7b7 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -3493,6 +3493,7 @@ int __cold open_ctree(struct super_block *sb, struct btrfs_fs_devices *fs_device goto fail_alloc; } + btrfs_info(fs_info, "first mount of filesystem %pU", disk_super->fsid); /* * Verify the type first, if that or the checksum value are * corrupted, we'll find out diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index 2c562febd801..6fc5fa18d1ee 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -391,7 +391,10 @@ void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function, static void btrfs_put_super(struct super_block *sb) { - close_ctree(btrfs_sb(sb)); + struct btrfs_fs_info *fs_info = btrfs_sb(sb); + + btrfs_info(fs_info, "last unmount of filesystem %pU", fs_info->fs_devices->fsid); + close_ctree(fs_info); } enum {