ENODEV on bcachefs on kernel < 6.7 [was: Re: [PATCH v2 0/3] Add support bcachefs filesystem]

[pvorel <pvorel@suse.de>]

Hi all,

I'm sorry I haven't tested LTP with bcachefs-tools and kernel < 6.7. 
Quite a lot of tests fails:

# LTP_SINGLE_FS_TYPE=bcachefs ./chdir01
tst_buffers.c:56: TINFO: Test is using guarded buffers
tst_device.c:96: TINFO: Found free device 0 '/dev/loop0'
tst_test.c:1709: TINFO: LTP version: 20230929-269-g958402a95
tst_test.c:1593: TINFO: Timeout per run is 0h 00m 30s
tst_supported_fs_types.c:151: TINFO: WARNING: testing only bcachefs
tst_supported_fs_types.c:122: TINFO: FUSE does support bcachefs
tst_supported_fs_types.c:57: TINFO: mkfs.bcachefs does exist
tst_test.c:1669: TINFO: === Testing on bcachefs ===
tst_test.c:1117: TINFO: Formatting /dev/loop0 with bcachefs opts='' 
extra opts=''
tst_test.c:1131: TINFO: Mounting /dev/loop0 to 
/tmp/LTP_chdwqhGtZ/mntpoint fstyp=bcachefs flags=0
tst_test.c:1131: TBROK: mount(/dev/loop0, mntpoint, bcachefs, 0, (nil)) 
failed: ENODEV (19)

Library fails on safe_mount(). I wonder if we should check for kernel >= 
6.7 in case of bcachefs, or if we should return 0 in safe_mount() in 
case of bcachefs and errno == ENODEV (and possibly kernel < 6.7).

Kind regards,
Petr