linux-ext4 - [PATCH v2 2/3] ext2: introduce new helper for xattr entry comparison

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Message-ID: <20190528025947.18373-2-cgxu519@zoho.com.cn>
Date:   Tue, 28 May 2019 10:59:46 +0800
From:   Chengguang Xu <cgxu519@...o.com.cn>
To:     jack@...e.com
Cc:     linux-ext4@...r.kernel.org, Chengguang Xu <cgxu519@...o.com.cn>
Subject: [PATCH v2 2/3] ext2: introduce new helper for xattr entry comparison

Introduce new helper ext2_xattr_cmp_entry() for xattr
entry comparison.

Signed-off-by: Chengguang Xu <cgxu519@...o.com.cn>
---
 fs/ext2/xattr.c | 25 ++++++++++++++++++-------
 1 file changed, 18 insertions(+), 7 deletions(-)

diff --git a/fs/ext2/xattr.c b/fs/ext2/xattr.c
index 28503979696d..59356cd2a842 100644
--- a/fs/ext2/xattr.c
+++ b/fs/ext2/xattr.c
@@ -166,6 +166,21 @@ ext2_xattr_entry_valid(struct ext2_xattr_entry *entry,
 	return true;
 }
 
+static int
+ext2_xattr_cmp_entry(int name_index, size_t name_len, const char *name,
+		     struct ext2_xattr_entry *entry)
+{
+	int cmp;
+
+	cmp = name_index - entry->e_name_index;
+	if (!cmp)
+		cmp = name_len - entry->e_name_len;
+	if (!cmp)
+		cmp = memcmp(name, entry->e_name, name_len);
+
+	return cmp;
+}
+
 /*
  * ext2_xattr_get()
  *
@@ -452,13 +467,9 @@ ext2_xattr_set(struct inode *inode, int name_index, const char *name,
 					min_offs = offs;
 			}
 			if (not_found > 0) {
-				not_found = name_index - last->e_name_index;
-				if (!not_found)
-					not_found = name_len - last->e_name_len;
-				if (!not_found) {
-					not_found = memcmp(name, last->e_name,
-							   name_len);
-				}
+				not_found = ext2_xattr_cmp_entry(name_index,
+								 name_len,
+								 name, last);
 				if (not_found <= 0)
 					here = last;
 			}
-- 
2.20.1