linux-ext4 - [PATCH RESEND v2 09/12] e2fsck: Detect duplicated casefolded direntries for rehash

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Date:   Thu, 10 Dec 2020 16:03:50 +0100
From:   Arnaud Ferraris <arnaud.ferraris@...labora.com>
To:     linux-ext4@...r.kernel.org
Cc:     drosen@...gle.com, krisman@...labora.com, ebiggers@...nel.org,
        tytso@....edu, Arnaud Ferraris <arnaud.ferraris@...labora.com>
Subject: [PATCH RESEND v2 09/12] e2fsck: Detect duplicated casefolded direntries for rehash

From: Gabriel Krisman Bertazi <krisman@...labora.com>

On pass2, support casefolded directories when looking for duplicated
entries.

Signed-off-by: Gabriel Krisman Bertazi <krisman@...labora.com>
Signed-off-by: Arnaud Ferraris <arnaud.ferraris@...labora.com>
---
 e2fsck/pass2.c | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/e2fsck/pass2.c b/e2fsck/pass2.c
index b62bfcb1..b6514de8 100644
--- a/e2fsck/pass2.c
+++ b/e2fsck/pass2.c
@@ -344,6 +344,20 @@ static int dict_de_cmp(const void *cmp_ctx, const void *a, const void *b)
 	return memcmp(de_a->name, de_b->name, a_len);
 }
 
+static int dict_de_cf_cmp(const void *cmp_ctx, const void *a, const void *b)
+{
+	const struct ext2fs_nls_table *tbl = cmp_ctx;
+	const struct ext2_dir_entry *de_a, *de_b;
+	int	a_len, b_len;
+
+	de_a = (const struct ext2_dir_entry *) a;
+	a_len = ext2fs_dirent_name_len(de_a);
+	de_b = (const struct ext2_dir_entry *) b;
+	b_len = ext2fs_dirent_name_len(de_b);
+
+	return ext2fs_casefold_cmp(tbl, de_a->name, a_len, de_b->name, b_len);
+}
+
 /*
  * This is special sort function that makes sure that directory blocks
  * with a dirblock of zero are sorted to the beginning of the list.
@@ -1255,7 +1269,13 @@ skip_checksum:
 
 	dir_encpolicy_id = find_encryption_policy(ctx, ino);
 
-	dict_init(&de_dict, DICTCOUNT_T_MAX, dict_de_cmp);
+	if (cf_dir) {
+		dict_init(&de_dict, DICTCOUNT_T_MAX, dict_de_cf_cmp);
+		dict_set_cmp_context(&de_dict, (void *)ctx->fs->encoding);
+	} else {
+		dict_init(&de_dict, DICTCOUNT_T_MAX, dict_de_cmp);
+	}
+
 	prev = 0;
 	do {
 		dgrp_t group;
-- 
2.29.2