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Date: Wed, 21 Nov 2018 00:10:31 -0500 From: "Theodore Y. Ts'o" <tytso@....edu> To: Gabriel Krisman Bertazi <krisman@...labora.co.uk> Cc: linux-ext4@...r.kernel.org Subject: Re: [PATCH e2fsprogs 7/9] lib/ext2fs: Support encoding when calculating dx hashes On Mon, Oct 15, 2018 at 05:12:18PM -0400, Gabriel Krisman Bertazi wrote: > diff --git a/lib/ext2fs/dirhash.c b/lib/ext2fs/dirhash.c > index 4ba3f35c091f..2198a6fd4d2a 100644 > --- a/lib/ext2fs/dirhash.c > +++ b/lib/ext2fs/dirhash.c > /* dirhash.c */ > -extern errcode_t ext2fs_dirhash(int version, const char *name, int len, > +extern errcode_t ext2fs_dirhash(const struct nls_table *charset, int version, > + int hash_flags, const char *name, int len, > const __u32 *seed, > ext2_dirhash_t *ret_hash, > ext2_dirhash_t *ret_minor_hash); We can't change function signatures in libext2fs, because this would breaks the shared libraries ABI. So when you want to add a new function parameter to a shared library function, what you should do is create a new function that has the new parameter, and call it something like ext2_dirhash2(). Then ext2_dirhash() can be implemented in terms of ext2_dirhash2(). Also, my preference would be to insert new input paramters after len, e.g.: extern errcode_t ext2fs_dirhash2(int version, const char *name, int len, int hash_flags, const struct nls_table *charset, const __u32 *seed, ext2_dirhash_t *ret_hash, ext2_dirhash_t *ret_minor_hash); - Ted
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