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Message-ID: <20111129003212.17953.23725.stgit@elm3c44.beaverton.ibm.com>
Date: Mon, 28 Nov 2011 16:32:12 -0800
From: "Darrick J. Wong" <djwong@...ibm.com>
To: Andreas Dilger <adilger.kernel@...ger.ca>,
Theodore Tso <tytso@....edu>,
"Darrick J. Wong" <djwong@...ibm.com>
Cc: Sunil Mushran <sunil.mushran@...cle.com>,
Amir Goldstein <amir73il@...il.com>,
Andi Kleen <andi@...stfloor.org>,
Mingming Cao <cmm@...ibm.com>,
Joel Becker <jlbec@...lplan.org>, linux-ext4@...r.kernel.org,
Coly Li <colyli@...il.com>
Subject: [PATCH 37/50] libext2fs: Block group checksum should use
metadata_csum algorithm (if feature flag set)
Change the block group algorithm to use the same algorithm as the rest of the
metadata_csum, if a certain incompat feature flag is set.
Signed-off-by: Darrick J. Wong <djwong@...ibm.com>
---
lib/e2p/feature.c | 2 ++
lib/ext2fs/csum.c | 62 ++++++++++++++++++++++++++++++++++----------------
lib/ext2fs/ext2_fs.h | 1 +
lib/ext2fs/ext2fs.h | 6 +++--
4 files changed, 49 insertions(+), 22 deletions(-)
diff --git a/lib/e2p/feature.c b/lib/e2p/feature.c
index 63486f3..dc52ba7 100644
--- a/lib/e2p/feature.c
+++ b/lib/e2p/feature.c
@@ -85,6 +85,8 @@ static struct feature feature_list[] = {
"mmp" },
{ E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_FLEX_BG,
"flex_bg"},
+ { E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM,
+ "bg_use_meta_csum"},
{ 0, 0, 0 },
};
diff --git a/lib/ext2fs/csum.c b/lib/ext2fs/csum.c
index 87ff5d0..6059039 100644
--- a/lib/ext2fs/csum.c
+++ b/lib/ext2fs/csum.c
@@ -725,32 +725,54 @@ STATIC __u16 ext2fs_group_desc_csum(ext2_filsys fs, dgrp_t group)
desc = ext2fs_group_desc(fs, fs->group_desc, group);
- if (fs->super->s_feature_ro_compat & EXT4_FEATURE_RO_COMPAT_GDT_CSUM) {
- size_t offset = offsetof(struct ext2_group_desc, bg_checksum);
-
#ifdef WORDS_BIGENDIAN
- struct ext4_group_desc swabdesc;
+ struct ext4_group_desc swabdesc;
- /* Have to swab back to little-endian to do the checksum */
- memcpy(&swabdesc, desc, size);
- ext2fs_swap_group_desc2(fs,
- (struct ext2_group_desc *) &swabdesc);
- desc = (struct ext2_group_desc *) &swabdesc;
+ /* Have to swab back to little-endian to do the checksum */
+ memcpy(&swabdesc, desc, size);
+ ext2fs_swap_group_desc2(fs,
+ (struct ext2_group_desc *) &swabdesc);
+ desc = (struct ext2_group_desc *) &swabdesc;
- group = ext2fs_swab32(group);
+ group = ext2fs_swab32(group);
#endif
- crc = ext2fs_crc16(~0, fs->super->s_uuid,
- sizeof(fs->super->s_uuid));
- crc = ext2fs_crc16(crc, &group, sizeof(group));
- crc = ext2fs_crc16(crc, desc, offset);
- offset += sizeof(desc->bg_checksum); /* skip checksum */
- /* for checksum of struct ext4_group_desc do the rest...*/
- if (offset < size) {
- crc = ext2fs_crc16(crc, (char *)desc + offset,
- size - offset);
- }
+
+ if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
+ EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
+ EXT2_HAS_INCOMPAT_FEATURE(fs->super,
+ EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM)) {
+ /* new metadata csum code */
+ __u16 old_crc;
+ __u32 crc32;
+
+ old_crc = desc->bg_checksum;
+ desc->bg_checksum = 0;
+ crc32 = ext2fs_crc32c_le(~0, fs->super->s_uuid,
+ sizeof(fs->super->s_uuid));
+ crc32 = ext2fs_crc32c_le(crc32, (unsigned char *)&group,
+ sizeof(group));
+ crc32 = ext2fs_crc32c_le(crc32, (unsigned char *)desc,
+ size);
+ desc->bg_checksum = old_crc;
+
+ crc = crc32 & 0xFFFF;
+ goto out;
}
+ /* old crc16 code */
+ size_t offset = offsetof(struct ext2_group_desc, bg_checksum);
+ crc = ext2fs_crc16(~0, fs->super->s_uuid,
+ sizeof(fs->super->s_uuid));
+ crc = ext2fs_crc16(crc, &group, sizeof(group));
+ crc = ext2fs_crc16(crc, desc, offset);
+ offset += sizeof(desc->bg_checksum); /* skip checksum */
+ /* for checksum of struct ext4_group_desc do the rest...*/
+ if (offset < size) {
+ crc = ext2fs_crc16(crc, (char *)desc + offset,
+ size - offset);
+ }
+
+out:
return crc;
}
diff --git a/lib/ext2fs/ext2_fs.h b/lib/ext2fs/ext2_fs.h
index d6cd6e0..709fc2f 100644
--- a/lib/ext2fs/ext2_fs.h
+++ b/lib/ext2fs/ext2_fs.h
@@ -742,6 +742,7 @@ struct ext2_super_block {
#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
#define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400
#define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000
+#define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM 0x2000
#define EXT2_FEATURE_COMPAT_SUPP 0
#define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \
diff --git a/lib/ext2fs/ext2fs.h b/lib/ext2fs/ext2fs.h
index 67c1ae0..844dc98 100644
--- a/lib/ext2fs/ext2fs.h
+++ b/lib/ext2fs/ext2fs.h
@@ -567,7 +567,8 @@ typedef struct ext2_icount *ext2_icount_t;
EXT3_FEATURE_INCOMPAT_EXTENTS|\
EXT4_FEATURE_INCOMPAT_FLEX_BG|\
EXT4_FEATURE_INCOMPAT_MMP|\
- EXT4_FEATURE_INCOMPAT_64BIT)
+ EXT4_FEATURE_INCOMPAT_64BIT|\
+ EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM)
#else
#define EXT2_LIB_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE|\
EXT3_FEATURE_INCOMPAT_JOURNAL_DEV|\
@@ -576,7 +577,8 @@ typedef struct ext2_icount *ext2_icount_t;
EXT3_FEATURE_INCOMPAT_EXTENTS|\
EXT4_FEATURE_INCOMPAT_FLEX_BG|\
EXT4_FEATURE_INCOMPAT_MMP|\
- EXT4_FEATURE_INCOMPAT_64BIT)
+ EXT4_FEATURE_INCOMPAT_64BIT|\
+ EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM)
#endif
#ifdef CONFIG_QUOTA
#define EXT2_LIB_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER|\
--
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