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Date: 23 Sep 2014 06:17:59 -0400
From: "George Spelvin" <linux@...izon.com>
To: linux-ext4@...r.kernel.org
Cc: linux@...izon.com, tytso@....edu
Subject: [PATCH v1 6/10] Add EXT2_HASH_UNSIGNED instead of magic constant 3
This can be changed later, allowing additional hash algorithms.
Signed-off-by: George Spelvin <linux@...izon.com>
---
The code now jumps to e2fsprogs. The patches are mostly analagous
to the kernel ones.
debugfs/htree.c | 2 +-
e2fsck/pass2.c | 2 +-
e2fsck/rehash.c | 4 ++--
lib/ext2fs/dirhash.c | 14 ++++----------
lib/ext2fs/ext2_fs.h | 15 ++++++++++++---
5 files changed, 20 insertions(+), 17 deletions(-)
diff --git a/debugfs/htree.c b/debugfs/htree.c
index 4f0118d..4ab1a4c 100644
--- a/debugfs/htree.c
+++ b/debugfs/htree.c
@@ -68,7 +68,7 @@ static void htree_dump_leaf_node(ext2_filsys fs, ext2_ino_t ino,
hash_alg = rootnode->hash_version;
if ((hash_alg <= EXT2_HASH_TEA) &&
(fs->super->s_flags & EXT2_FLAGS_UNSIGNED_HASH))
- hash_alg += 3;
+ hash_alg += EXT2_HASH_UNSIGNED;
while (offset < fs->blocksize) {
dirent = (struct ext2_dir_entry *) (buf + offset);
diff --git a/e2fsck/pass2.c b/e2fsck/pass2.c
index 0b9c5c5..454bbdc 100644
--- a/e2fsck/pass2.c
+++ b/e2fsck/pass2.c
@@ -1003,7 +1003,7 @@ inline_read_fail:
dx_dir->hashversion = root->hash_version;
if ((dx_dir->hashversion <= EXT2_HASH_TEA) &&
(fs->super->s_flags & EXT2_FLAGS_UNSIGNED_HASH))
- dx_dir->hashversion += 3;
+ dx_dir->hashversion += EXT2_HASH_UNSIGNED;
dx_dir->depth = root->indirect_levels + 1;
} else if ((dirent->inode == 0) &&
(rec_len == fs->blocksize) &&
diff --git a/e2fsck/rehash.c b/e2fsck/rehash.c
index e37e871..e48feb7 100644
--- a/e2fsck/rehash.c
+++ b/e2fsck/rehash.c
@@ -138,7 +138,7 @@ static int fill_dir_block(ext2_filsys fs,
hash_alg = fs->super->s_def_hash_version;
if ((hash_alg <= EXT2_HASH_TEA) &&
(fs->super->s_flags & EXT2_FLAGS_UNSIGNED_HASH))
- hash_alg += 3;
+ hash_alg += EXT2_HASH_UNSIGNED;
/* While the directory block is "hot", index it. */
dir_offset = 0;
while (dir_offset < fs->blocksize) {
@@ -375,7 +375,7 @@ static int duplicate_search_and_fix(e2fsck_t ctx, ext2_filsys fs,
hash_alg = fs->super->s_def_hash_version;
if ((hash_alg <= EXT2_HASH_TEA) &&
(fs->super->s_flags & EXT2_FLAGS_UNSIGNED_HASH))
- hash_alg += 3;
+ hash_alg += EXT2_HASH_UNSIGNED;
for (i=1; i < fd->num_array; i++) {
ent = fd->harray + i;
diff --git a/lib/ext2fs/dirhash.c b/lib/ext2fs/dirhash.c
index c4ac94e..ef7820c 100644
--- a/lib/ext2fs/dirhash.c
+++ b/lib/ext2fs/dirhash.c
@@ -197,7 +197,7 @@ errcode_t ext2fs_dirhash(int version, const char *name, int len,
const char *p;
int i;
__u32 in[8], buf[4];
- int unsigned_flag = 0;
+ int unsigned_flag = (version >= EXT2_HASH_UNSIGNED);
/* Initialize the default seed for the hash checksum functions */
buf[0] = 0x67452301;
@@ -216,16 +216,12 @@ errcode_t ext2fs_dirhash(int version, const char *name, int len,
}
switch (version) {
- case EXT2_HASH_LEGACY_UNSIGNED:
- unsigned_flag++;
- /* fallthrough */
case EXT2_HASH_LEGACY:
+ case EXT2_HASH_LEGACY_UNSIGNED:
hash = dx_hack_hash(name, len, unsigned_flag);
break;
- case EXT2_HASH_HALF_MD4_UNSIGNED:
- unsigned_flag++;
- /* fallthrough */
case EXT2_HASH_HALF_MD4:
+ case EXT2_HASH_HALF_MD4_UNSIGNED:
p = name;
while (len > 0) {
str2hashbuf(p, len, in, 8, unsigned_flag);
@@ -236,10 +232,8 @@ errcode_t ext2fs_dirhash(int version, const char *name, int len,
minor_hash = buf[2];
hash = buf[1];
break;
- case EXT2_HASH_TEA_UNSIGNED:
- unsigned_flag++;
- /* fallthrough */
case EXT2_HASH_TEA:
+ case EXT2_HASH_TEA_UNSIGNED:
p = name;
while (len > 0) {
str2hashbuf(p, len, in, 4, unsigned_flag);
diff --git a/lib/ext2fs/ext2_fs.h b/lib/ext2fs/ext2_fs.h
index f9a4bdb..53df88c 100644
--- a/lib/ext2fs/ext2_fs.h
+++ b/lib/ext2fs/ext2_fs.h
@@ -226,9 +226,18 @@ struct ext2_dx_root_info {
#define EXT2_HASH_LEGACY 0
#define EXT2_HASH_HALF_MD4 1
#define EXT2_HASH_TEA 2
-#define EXT2_HASH_LEGACY_UNSIGNED 3 /* reserved for userspace lib */
-#define EXT2_HASH_HALF_MD4_UNSIGNED 4 /* reserved for userspace lib */
-#define EXT2_HASH_TEA_UNSIGNED 5 /* reserved for userspace lib */
+
+/*
+ * For historical reasons, the first three hash algorithms
+ * have signed and unsigned variants. So, for internal
+ * use only, define some extra values outside the range of
+ * what's allowed on disk.
+ */
+#define EXT2_HASH_UNSIGNED 3
+
+#define EXT2_HASH_LEGACY_UNSIGNED (EXT2_HASH_UNSIGNED + EXT2_HASH_LEGACY)
+#define EXT2_HASH_HALF_MD4_UNSIGNED (EXT2_HASH_UNSIGNED + EXT2_HASH_HALF_MD4)
+#define EXT2_HASH_TEA_UNSIGNED (EXT2_HASH_UNSIGNED + EXT2_HASH_TEA)
#define EXT2_HASH_FLAG_INCOMPAT 0x1
--
2.1.0
--
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