Hello,
I was trying to run: fsck.f2fs --dry-run /dev/mmcblk0p2 on a RO mounted device,
and fsck refuses to run. Strace shows that it tries to open the block device
with O_EXCL even in RO mode, which will always fail if the block device
is mounted.
openat(AT_FDCWD, "/proc/mounts", O_RDONLY|O_CLOEXEC) = 3
fstat64(3, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
read(3, "/dev/root / f2fs ro,lazytime,rel"..., 1024) = 843
close(3) = 0
write(1, "Info: Mounted device!\n", 22Info: Mounted device!
) = 22
write(1, "Info: Check FS only on RO mounte"..., 41Info: Check FS only on RO
mounted device
) = 41
stat64("/dev/mmcblk0p2", {st_mode=S_IFBLK|0600, st_rdev=makedev(0xb3, 0x2),
...}) = 0
openat(AT_FDCWD, "/dev/mmcblk0p2", O_RDWR|O_EXCL|O_LARGEFILE) = -1 EBUSY
(Device or resource busy)
openat(AT_FDCWD, "/dev/mmcblk0p2", O_RDONLY|O_EXCL|O_LARGEFILE) = -1 EBUSY
(Device or resource busy)
write(1, "\tError: Failed to open the devic"..., 35 Error: Failed to open
the device!
) = 35
exit_group(-1) = ?
+++ exited with 255 +++
fsck.f2fs --dry-run /dev/mmcblk0p2
Info: Dry run
Info: Mounted device!
Info: Check FS only on RO mounted device
Error: Failed to open the device!
I suggest not using O_EXCL for --dry-run check.
regards,
Ondrej
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