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Date:   Tue, 3 Aug 2021 13:36:59 -0400
From:   "Theodore Ts'o" <tytso@....edu>
To:     Jan Kara <jack@...e.cz>
Cc:     linux-ext4@...r.kernel.org
Subject: Re: [PATCH 4/9] libext2fs: Support for orphan file feature

On Mon, Jul 12, 2021 at 05:43:10PM +0200, Jan Kara wrote:
> @@ -825,6 +826,7 @@ struct ext2_super_block {
>  #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM		0x0010
>  #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK	0x0020
>  #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE	0x0040
> +#define EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT	0x0080
>  #define EXT4_FEATURE_RO_COMPAT_QUOTA		0x0100
>  #define EXT4_FEATURE_RO_COMPAT_BIGALLOC		0x0200

(This isn't a full review of the patch, but just a quick feedback of
what I've noticed so far.)

Since Andreas has requested that we not get rid of the
RO_COMPAT_SNAPSHOT, I'm using 0x10000 for
EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT in my testing.

I also noted a number of new GCC warnings when running "make gcc-wall"
on lib/ext2fs after applying this commit.

					- Ted

/usr/projects/e2fsprogs/e2fsprogs/lib/ext2fs/orphan.c: In function ‘ext2fs_do_orphan_file_block_csum’:
/usr/projects/e2fsprogs/e2fsprogs/lib/ext2fs/orphan.c:58:30: warning: pointer targets in passing argument 2 of ‘ext2fs_crc32c_le’ differ in signedness [-Wpointer-sign]
   58 |  crc = ext2fs_crc32c_le(crc, buf, inodes_per_ob * sizeof(__u32));
      |                              ^~~
      |                              |
      |                              char *
In file included from /usr/projects/e2fsprogs/e2fsprogs/lib/ext2fs/ext2fsP.h:16,
                 from /usr/projects/e2fsprogs/e2fsprogs/lib/ext2fs/orphan.c:16:
/usr/projects/e2fsprogs/e2fsprogs/lib/ext2fs/ext2fs.h:1075:63: note: expected ‘const unsigned char *’ but argument is of type ‘char *’
 1075 | extern __u32 ext2fs_crc32c_le(__u32 crc, unsigned char const *p, size_t len);
      |                                          ~~~~~~~~~~~~~~~~~~~~~^
/usr/projects/e2fsprogs/e2fsprogs/lib/ext2fs/orphan.c: In function ‘ext2fs_do_orphan_file_block_csum’:
/usr/projects/e2fsprogs/e2fsprogs/lib/ext2fs/orphan.c:58:30: warning: pointer targets in passing argument 2 of ‘ext2fs_crc32c_le’ differ in signedness [-Wpointer-sign]
   58 |  crc = ext2fs_crc32c_le(crc, buf, inodes_per_ob * sizeof(__u32));
      |                              ^~~
      |                              |
      |                              char *
In file included from /usr/projects/e2fsprogs/e2fsprogs/lib/ext2fs/ext2fsP.h:16,
                 from /usr/projects/e2fsprogs/e2fsprogs/lib/ext2fs/orphan.c:16:
/usr/projects/e2fsprogs/e2fsprogs/lib/ext2fs/ext2fs.h:1075:63: note: expected ‘const unsigned char *’ but argument is of type ‘char *’
 1075 | extern __u32 ext2fs_crc32c_le(__u32 crc, unsigned char const *p, size_t len);
      |                                          ~~~~~~~~~~~~~~~~~~~~~^
make[1]: Leaving directory '/build/e2fsprogs/lib/ext2fs'


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