linux-kernel - Long mount time of ESP FAT partition

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:   Tue, 28 Feb 2023 14:00:06 +0100
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     Hirofumi Ogawa <hirofumi@...l.parknet.co.jp>
Cc:     LKML <linux-kernel@...r.kernel.org>
Subject: Long mount time of ESP FAT partition

Dear Linux folks,


On a Dell Precision 3540 with Debian sid/unstable, Linux 6.1.12 takes 
1.5 seconds to mount the 128 MB FAT partition `/dev/nvme0n1p1` to 
`/boot/efi`.

```
$ lsblk --fs
NAME                FSTYPE      FSVER LABEL UUID 
         FSAVAIL FSUSE% MOUNTPOINTS
nvme0n1 

├─nvme0n1p1         vfat        FAT32 ESP   381C-FF6C 
           49.2M    61% /boot/efi
├─nvme0n1p2         crypto_LUKS 2 
b88be798-13e3-4884-9748-bf7a23f0ae87
│ └─nvme0n1p2_crypt ext4        1.0 
c9342a55-b747-4442-b2f4-bc03eb7a51cf    733G    17% /
└─nvme0n1p3         ext4        1.0   boot 
16743b63-5a4f-404e-a46e-2db5add63980  303.6M    10% /boot
$ more /etc/fstab
[…]
/dev/disk/by-uuid/c9342a55-b747-4442-b2f4-bc03eb7a51cf /  auto 
defaults,errors=remount-ro 0   1
/dev/disk/by-uuid/16743b63-5a4f-404e-a46e-2db5add63980 /boot  auto 
defaults,errors=remount-ro      0       1
UUID=381C-FF6C  /boot/efi       vfat    umask=0022      0       1
$ journalctl -b -u boot.mount -o short-precise
Feb 28 11:19:14.006616 morley systemd[1]: Mounting boot.mount - /boot...
Feb 28 11:19:14.013246 morley systemd[1]: Mounted boot.mount - /boot.
$ journalctl -b -u boot-efi.mount -o short-precise
Feb 28 11:19:14.014469 morley systemd[1]: Mounting boot-efi.mount - 
/boot/efi...
Feb 28 11:19:15.550770 morley systemd[1]: Mounted boot-efi.mount - 
/boot/efi.
```

On a Dell Latitude E7250 mounting a 128 MB FAT partition `/dev/sda1` 
(SAMSUNG SSD PM851 mSATA 256GB) only takes 90 ms.

```
$ journalctl -u boot-efi.mount -o short-monotonic -b
[   10.693263] ersatz systemd[1]: Mounting boot-efi.mount - /boot/efi...
[   10.783176] ersatz systemd[1]: Mounted boot-efi.mount - /boot/efi.
```


Kind regards,

Paul