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none X-Spamd-Result: default: False [-4.30 / 50.00]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; MIME_GOOD(-0.10)[text/plain]; HAS_ORG_HEADER(0.00)[]; RCVD_COUNT_THREE(0.00)[3]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; NEURAL_HAM_SHORT(-0.20)[-1.000]; RCPT_COUNT_TWELVE(0.00)[14]; FUZZY_BLOCKED(0.00)[rspamd.com]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; RCVD_TLS_ALL(0.00)[]; BAYES_HAM(-3.00)[100.00%] X-Headers-End: 1rkXqI-0001Pz-9i Subject: Re: [f2fs-dev] [PATCH v13 3/9] libfs: Introduce case-insensitive string comparison helper X-BeenThere: linux-f2fs-devel@lists.sourceforge.net X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: brauner@kernel.org, kernel@collabora.com, tytso@mit.edu, jack@suse.cz, linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, adilger.kernel@dilger.ca, viro@zeniv.linux.org.uk, linux-fsdevel@vger.kernel.org, jaegeuk@kernel.org, linux-ext4@vger.kernel.org, Gabriel Krisman Bertazi Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net Eugen Hristev writes: > From: Gabriel Krisman Bertazi > > generic_ci_match can be used by case-insensitive filesystems to compare > strings under lookup with dirents in a case-insensitive way. This > function is currently reimplemented by each filesystem supporting > casefolding, so this reduces code duplication in filesystem-specific > code. > > Signed-off-by: Gabriel Krisman Bertazi > [eugen.hristev@collabora.com: rework to first test the exact match] > Signed-off-by: Eugen Hristev > --- > fs/libfs.c | 81 ++++++++++++++++++++++++++++++++++++++++++++++ > include/linux/fs.h | 4 +++ > 2 files changed, 85 insertions(+) > > diff --git a/fs/libfs.c b/fs/libfs.c > index c297953db948..c107c24f33b9 100644 > --- a/fs/libfs.c > +++ b/fs/libfs.c > @@ -1776,6 +1776,87 @@ static const struct dentry_operations generic_ci_dentry_ops = { > .d_revalidate = fscrypt_d_revalidate, > #endif > }; > + > +/** > + * generic_ci_match() - Match a name (case-insensitively) with a dirent. > + * This is a filesystem helper for comparison with directory entries. > + * generic_ci_d_compare should be used in VFS' ->d_compare instead. > + * > + * @parent: Inode of the parent of the dirent under comparison > + * @name: name under lookup. > + * @folded_name: Optional pre-folded name under lookup > + * @de_name: Dirent name. > + * @de_name_len: dirent name length. > + * > + * Test whether a case-insensitive directory entry matches the filename > + * being searched. If @folded_name is provided, it is used instead of > + * recalculating the casefold of @name. > + * > + * Return: > 0 if the directory entry matches, 0 if it doesn't match, or > + * < 0 on error. > + */ > +int generic_ci_match(const struct inode *parent, > + const struct qstr *name, > + const struct qstr *folded_name, > + const u8 *de_name, u32 de_name_len) > +{ > + const struct super_block *sb = parent->i_sb; > + const struct unicode_map *um = sb->s_encoding; > + struct fscrypt_str decrypted_name = FSTR_INIT(NULL, de_name_len); > + struct qstr dirent = QSTR_INIT(de_name, de_name_len); > + int res, match = 0; > + > + if (IS_ENCRYPTED(parent)) { > + const struct fscrypt_str encrypted_name = > + FSTR_INIT((u8 *) de_name, de_name_len); > + > + if (WARN_ON_ONCE(!fscrypt_has_encryption_key(parent))) > + return -EINVAL; > + > + decrypted_name.name = kmalloc(de_name_len, GFP_KERNEL); > + if (!decrypted_name.name) > + return -ENOMEM; > + res = fscrypt_fname_disk_to_usr(parent, 0, 0, &encrypted_name, > + &decrypted_name); > + if (res < 0) > + goto out; > + dirent.name = decrypted_name.name; > + dirent.len = decrypted_name.len; > + } > + > + /* > + * Attempt a case-sensitive match first. It is cheaper and > + * should cover most lookups, including all the sane > + * applications that expect a case-sensitive filesystem. > + */ > + if (folded_name->name) { > + if (dirent.len == folded_name->len && > + !memcmp(folded_name->name, dirent.name, dirent.len)) { > + match = 1; > + goto out; > + } > + res = utf8_strncasecmp_folded(um, folded_name, &dirent); > + } else { > + if (dirent.len == name->len && > + !memcmp(name->name, dirent.name, dirent.len) && > + (!sb_has_strict_encoding(sb) || !utf8_validate(um, name))) { > + match = 1; > + goto out; > + } > + res = utf8_strncasecmp(um, name, &dirent); > + } > + > +out: > + kfree(decrypted_name.name); > + if (match) /* matched by direct comparison */ > + return 1; > + else if (!res) /* matched by utf8 comparison */ > + return 1; > + else if (res < 0) /* error on utf8 comparison */ > + return res; > + return 0; /* no match */ > +} I think I've made this comment before, but I'd prefer this to be written in a much simpler way if (res < 0) return res; return (match || !res); Other than that, this looks good to me. -- Gabriel Krisman Bertazi _______________________________________________ Linux-f2fs-devel mailing list Linux-f2fs-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel