Hi Andreas,
On Sun, Jan 13, 2019 at 1:36 AM Andreas Dilger <adilger@xxxxxxxxx> wrote:
> Don't update the superblock s_rev_level during mount if it isn't
> actually necessary, only if superblock features are being set by
> the kernel. This was originally added for ext3 since it always
> set the INCOMPAT_RECOVER and HAS_JOURNAL features during mount,
> but this is not needed since no journal mode was added to ext4.
>
> That will allow Geert to mount his 20-year-old ext2 rev 0.0 m68k
> filesystem, as a testament of the backward compatibility of ext4.
>
> Fixes: 0390131ba84f ("ext4: Allow ext4 to run without a journal")
> Signed-off-by: Andreas Dilger <adilger@xxxxxxxxx>
Thanks for your patch!
> --- a/fs/ext4/ext4.h
> +++ b/fs/ext4/ext4.h
> @@ -1670,6 +1670,7 @@ static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
> } \
> static inline void ext4_set_feature_##name(struct super_block *sb) \
> { \
> + ext4_update_dynamic_rev(sb); \
This doesn't compile, as ext4_update_dynamic_rev() is used before its
declaration:
In file included from fs/ext4/bitmap.c:12:0:
fs/ext4/ext4.h: In function ‘ext4_set_feature_dir_prealloc’:
fs/ext4/ext4.h:1673:2: error: implicit declaration of function
‘ext4_update_dynamic_rev’ [-Werror=implicit-function-declaration]
ext4_update_dynamic_rev(sb); \
^
fs/ext4/ext4.h:1719:1: note: in expansion of macro ‘EXT4_FEATURE_COMPAT_FUNCS’
EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC)
^~~~~~~~~~~~~~~~~~~~~~~~~
fs/ext4/ext4.h: At top level:
fs/ext4/ext4.h:2678:13: warning: conflicting types for ‘ext4_update_dynamic_rev’
extern void ext4_update_dynamic_rev(struct super_block *sb);
^~~~~~~~~~~~~~~~~~~~~~~
fs/ext4/ext4.h:1673:2: note: previous implicit declaration of
‘ext4_update_dynamic_rev’ was here
ext4_update_dynamic_rev(sb); \
^
fs/ext4/ext4.h:1719:1: note: in expansion of macro ‘EXT4_FEATURE_COMPAT_FUNCS’
EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC)
^~~~~~~~~~~~~~~~~~~~~~~~~
Moving the declaration up fixes that.
Hence with that fixed:
Tested-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Thanks!
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
