[B][SRU][PATCH 0/1] ext4: fix mount failure with quota configured as module

[Po-Hsu Lin]

== SRU Justification ==
Commit d65d87a07476 ("ext4: improve explanation of a mount failure
caused by a misconfigured kernel") applied to our Bionic tree via the
stable-update process does not consider the situation when quota support
was configured as a module.

This will cause failure to quotactl04 test from ubuntu_ltp_syscalls:
  <<<test_start>>>
  tag=quotactl04 stime=1585032076
  cmdline="quotactl04"
  contacts=""
  analysis=exit
  <<<test_output>>>
  incrementing stop
  tst_kconfig.c:62: INFO: Parsing kernel config '/boot/config-4.15.0-92-generic'
  tst_device.c:244: INFO: Using test device LTP_DEV='/dev/loop0'
  tst_test.c:1229: INFO: Timeout per run is 0h 05m 00s
  tst_mkfs.c:90: INFO: Formatting /dev/loop0 with ext4 opts='' extra opts='-O quota,project'
  mke2fs 1.44.1 (24-Mar-2018)
  safe_macros.c:769: BROK: quotactl04.c:109: mount(/dev/loop0, mntpoint, ext4, 0, 0x55edd2c1ab1d) failed: EINVAL (22)

  Summary:
  passed   0
  failed   0
  skipped  0
  warnings 0
  <<<execution_status>>>
  initiation_status="ok"
  duration=2 termination_type=exited termination_id=2 corefile=no
  cutime=0 cstime=2
  <<<test_end>>>

And from the syslog you will see:
  LTP: starting quotactl04
  EXT4-fs (loop0): The kernel was not built with CONFIG_QUOTA and CONFIG_QFMT_V2

== Fix ==
* 9db176bceb5c ("ext4: fix mount failure with quota configured as module")

This patch can be cherry-picked into Bionic and it's already in Focal.

I didn't see commit d65d87a07476 in Eoan / Disco, so I think they don't
need this patch.

== Test ==
Test kernel could be found here:
https://people.canonical.com/~phlin/kernel/lp-1868665-quota-module/

Tested with the quotactl04 test from ubuntu_ltp_syscalls and it has
passed as expected.

== Regression Potential ==
Low, this patch is specific to ext4 quota support. And it's just using
a more general way to do the check.


Jan Kara (1):
  ext4: fix mount failure with quota configured as module

 fs/ext4/super.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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2.7.4