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Message-ID: <20110915200519.GC12086@tux1.beaverton.ibm.com>
Date: Thu, 15 Sep 2011 13:05:19 -0700
From: "Darrick J. Wong" <djwong@...ibm.com>
To: Andreas Dilger <adilger@...ger.ca>
Cc: "Theodore Ts'o" <tytso@....edu>,
Amir Goldstein <amir73il@...il.com>, linux-ext4@...r.kernel.org
Subject: Re: On-disk field assignments for metadata checksum and snapshots
On Thu, Sep 15, 2011 at 01:10:41PM -0600, Andreas Dilger wrote:
> On 2011-09-15, at 11:19 AM, Darrick J. Wong wrote:
> > On Thu, Sep 15, 2011 at 09:55:12AM -0700, Darrick J. Wong wrote:
> >> On Thu, Sep 15, 2011 at 11:12:22AM -0400, Theodore Ts'o wrote:
> >>>
> >>> Hi Darrick, Amir,
> >>>
> >>> Could you please take a look at the changes here and make sure they look
> >>> sane to you? I just want to make sure we're all on the same page as
> >>> far as on-disk field assignments are concerned.
> >>>
> >>> Also, one thought for Darrick. I note that with the assignment of
> >>> l_i_checksum, we've exhausted the very last field in the base 128-byte
> >>> inode. Given that the checksum is protecting a 128 byte or 256 byte
> >>> inode, I wonder if we need to use a full 32 bit checksum. Maybe we
> >>> should just use 16 bits of a crc32c?
> >>>
> >>> I did some web searching on the issue, and the recommendation I've come
> >>> across is the following:
> >>>
> >>> "Generally speaking, an n-bit CRC's error detection properties
> >>> degrade after 2**(n-1)-1 data bits."
> >>>
> >>> So a CRC-16 will be good up to just under 4k. A 16-bit truncated crc32c
> >>> will presumably not be as good as a crc16, but seems to me that it's
> >>> probably fine for a 128-256 byte inode. Especially since the main thing
> >>> we're generally worried about is detecting a block getting written to
> >>> the wrong location, overwriting an existing inode table block. So if we
> >>> were really paranoid we could verify the checksums for all of the inodes
> >>> in a particular inode table block when we read in the inode table block
> >>> in question.
> >>
> >> On the other hand, you can set inode_size = block_size, which means that
> >> with a 4k inode + 32-bit inode number + 16-byte UUID you actually could
> >> run afoul of that degradation. But that seems like an extreme argument
> >> for an infrequent case.
> >>
> >> Actually, I've started wondering if we could split the 4 bytes of the crc32c
> >> among the first few inodes of the block, and compute the checksums at block
> >> size granularity. Though that would make inode updates particularly more
> >> expensive... but if I'm going to shift the write-time checksum to a journal
> >> callback then it's not going to matter (for the journal-using users, anyway).
> >>
> >> Though with that scheme, you'd probably lose more inodes for any given
> >> integrity error. It also means that the checksum size in each inode becomes
> >> variable (32 bits if inode=blocksize, 16 if inode=blocksize/2, and 8
> >> otherwise), which is a somewhat confusing schema.
> >>
> >> <shrug> Do you anticipate a need to add more fields to 128-byte inode
> >> filesystems? I think most of those would be former ext2/3 filesystems,
> >> floppies, and "small" filesystems, correct?
> >>
> >> Or does this second scheme sound more attractive?
> >
> > I forgot to say, "as opposed to storing the lower 16 bits below 128 bytes and
> > the upper 16 bits somewhere above it."
>
> This is also a possible alternative, though it makes for more fragments that
> need to be checksummed. I think as a general rule it makes sense to store
> the checksum as the last word in the structure, if possible, so that the
> checksum can be computed in a single call. This is already done for 128-byte
> inodes and for 32-byte group descriptors, but should also be done for the
> s_checksum field in the superblock (i.e. put it after s_reserved instead of
> before).
>
> For inodes 256-bytes or larger (which are commonly used for Lustre to store
> large xattrs that are needed for every file access), and 64-byte group
> descriptors it has to checksum 2 fragments, but at least not more than that
> if we precompute for each inode the crc32c(uuid + inum) seed and for each
> group the crc32c(uuid + group) seed. The superblock already contains the
> UUID, but it may make sense to still precompute the crc32c(uuid) part and
> store it in ext4_sb_info for computing the inode seed.
>
> It really would be interesting to measure the crc32c() and crc16() performance
> for 512MB in chunks of 4, 32, 128, 256, and 4096 bytes (which is the largest
> that we will generally use until we get to data checksums). That would give
> us a good idea how fast the checksums _really_ are in our actual usage.
Ok, here's a rough cut with the Xeon X5650 at work:
crc32c-sby8-be@4: sz=536870912 time=1816.711ms speed=288591.85K/s res=0xdc9b4e3f
crc32c-sby8-be@32: sz=536870912 time=419.187ms speed=1250724.37K/s res=0xdc9b4e3f
crc32c-sby8-be@128: sz=536870912 time=340.387ms speed=1540270.88K/s res=0xdc9b4e3f
crc32c-sby8-be@256: sz=536870912 time=327.602ms speed=1600381.50K/s res=0xdc9b4e3f
crc32c-sby8-be@512: sz=536870912 time=321.288ms speed=1631831.48K/s res=0xdc9b4e3f
crc32c-sby8-be@...6: sz=536870912 time=314.795ms speed=1665489.62K/s res=0xdc9b4e3f
crc32c-sby8-be@...36: sz=536870912 time=310.732ms speed=1687266.98K/s res=0xdc9b4e3f
crc32c-sby8-be@...8576: sz=536870912 time=310.512ms speed=1688461.53K/s res=0xdc9b4e3f
crc32c-sby8-be@...870912: sz=536870912 time=312.628ms speed=1677032.72K/s res=0xdc9b4e3f
crc32c-sby8-le@4: sz=536870912 time=1722.019ms speed=304461.26K/s res=0xfc72d93b
crc32c-sby8-le@32: sz=536870912 time=410.747ms speed=1276424.81K/s res=0xfc72d93b
crc32c-sby8-le@128: sz=536870912 time=338.527ms speed=1548731.75K/s res=0xfc72d93b
crc32c-sby8-le@256: sz=536870912 time=329.869ms speed=1589382.17K/s res=0xfc72d93b
crc32c-sby8-le@512: sz=536870912 time=322.203ms speed=1627196.09K/s res=0xfc72d93b
crc32c-sby8-le@...6: sz=536870912 time=309.987ms speed=1691324.57K/s res=0xfc72d93b
crc32c-sby8-le@...36: sz=536870912 time=309.072ms speed=1696328.93K/s res=0xfc72d93b
crc32c-sby8-le@...8576: sz=536870912 time=310.918ms speed=1686259.03K/s res=0xfc72d93b
crc32c-sby8-le@...870912: sz=536870912 time=309.269ms speed=1695251.44K/s res=0xfc72d93b
crc16@4: sz=536870912 time=1605.590ms speed=326539.15K/s res=0x4bff
crc16@32: sz=536870912 time=1440.110ms speed=364061.15K/s res=0x4bff
crc16@128: sz=536870912 time=1374.726ms speed=381376.47K/s res=0x4bff
crc16@256: sz=536870912 time=1375.174ms speed=381251.98K/s res=0x4bff
crc16@512: sz=536870912 time=1393.672ms speed=376191.85K/s res=0x4bff
crc16@...6: sz=536870912 time=1365.874ms speed=383847.97K/s res=0x4bff
crc16@...36: sz=536870912 time=1363.806ms speed=384430.11K/s res=0x4bff
crc16@...8576: sz=536870912 time=1363.767ms speed=384441.16K/s res=0x4bff
crc16@...870912: sz=536870912 time=1366.145ms speed=383771.74K/s res=0x4bff
crc32c@4: sz=536870912 time=1435.798ms speed=365154.39K/s res=0xfc72d93b
crc32c@32: sz=536870912 time=1287.815ms speed=407114.42K/s res=0xfc72d93b
crc32c@128: sz=536870912 time=1249.553ms speed=419580.42K/s res=0xfc72d93b
crc32c@256: sz=536870912 time=1244.488ms speed=421288.07K/s res=0xfc72d93b
crc32c@512: sz=536870912 time=1240.666ms speed=422585.95K/s res=0xfc72d93b
crc32c@...6: sz=536870912 time=1238.181ms speed=423434.03K/s res=0xfc72d93b
crc32c@...36: sz=536870912 time=1238.595ms speed=423292.52K/s res=0xfc72d93b
crc32c@...8576: sz=536870912 time=1239.664ms speed=422927.60K/s res=0xfc72d93b
crc32c@...870912: sz=536870912 time=1238.147ms speed=423445.61K/s res=0xfc72d93b
crc16-t10dif@4: sz=536870912 time=1898.668ms speed=276134.71K/s res=0x7449
crc16-t10dif@32: sz=536870912 time=1781.657ms speed=294269.88K/s res=0x7449
crc16-t10dif@128: sz=536870912 time=1768.654ms speed=296433.30K/s res=0x7449
crc16-t10dif@256: sz=536870912 time=1767.750ms speed=296584.86K/s res=0x7449
crc16-t10dif@512: sz=536870912 time=1766.331ms speed=296823.21K/s res=0x7449
crc16-t10dif@...6: sz=536870912 time=1765.198ms speed=297013.75K/s res=0x7449
crc16-t10dif@...36: sz=536870912 time=1764.398ms speed=297148.38K/s res=0x7449
crc16-t10dif@...8576: sz=536870912 time=1765.903ms speed=296895.06K/s res=0x7449
crc16-t10dif@...870912: sz=536870912 time=1765.477ms speed=296966.71K/s res=0x7449
crc32c-intel@4: sz=536870912 time=1025.192ms speed=511404.47K/s res=0xfc72d93b
crc32c-intel@32: sz=536870912 time=135.124ms speed=3880043.59K/s res=0xfc72d93b
crc32c-intel@128: sz=536870912 time=121.991ms speed=4297766.44K/s res=0xfc72d93b
crc32c-intel@256: sz=536870912 time=120.008ms speed=4368783.42K/s res=0xfc72d93b
crc32c-intel@512: sz=536870912 time=118.889ms speed=4409903.92K/s res=0xfc72d93b
crc32c-intel@...6: sz=536870912 time=118.112ms speed=4438891.54K/s res=0xfc72d93b
crc32c-intel@...36: sz=536870912 time=118.010ms speed=4442735.48K/s res=0xfc72d93b
crc32c-intel@...8576: sz=536870912 time=119.969ms speed=4370205.80K/s res=0xfc72d93b
crc32c-intel@...870912: sz=536870912 time=118.369ms speed=4429255.67K/s res=0xfc72d93b
As you can see from the results, the algorithm(s) that are fast generally don't
reach full speed until they hit 4KB chunk sizes. powerpc64 and a laptop seems
to yield speed scaling similar results.
crc32c-sby8-* = my new crc32c implementation
crc16 = kernel's crc16 implementation
crc32c = kernel's current crc32c sw implementation
crc16-t10dif = t10dif crc16 implementation
crc32c-intel = hw accelerated crc32c
--D
>
> >>> commit ceade753f14f2697d329f71b5277b49fd46fcb55
> >>> Author: Theodore Ts'o <tytso@....edu>
> >>> Date: Thu Sep 15 10:38:55 2011 -0400
> >>>
> >>> libext2fs: add metadata checksum and snapshot feature flags
> >>>
> >>> Reserve EXT4_FEATURE_RO_COMPAT_METADATA_CSUM and
> >>> EXT2_FEATURE_COMPAT_EXCLUDE_BITMAP. Also reserve fields in the
> >>> superblock and the inode for the checksums. In the block group
> >>> descriptor, reserve the exclude bitmap field for the snapshot feature,
> >>> and checksums for the inode and block allocation bitmaps.
> >>>
> >>> With this commit, the metadata checksum and exclude bitmap features
> >>> should have reserved all of the fields they need in ext4's on-disk
> >>> format.
> >>>
> >>> This commit also fixes an a missing byte swap for s_overhead_blocks.
> >>>
> >>> Signed-off-by: "Theodore Ts'o" <tytso@....edu>
> >>> Cc: Darrick J. Wong <djwong@...ibm.com>
> >>> Cc: Amir Goldstein <amir73il@...il.com>
> >>>
> >>> diff --git a/debugfs/set_fields.c b/debugfs/set_fields.c
> >>> index ac6bc25..cba9c12 100644
> >>> --- a/debugfs/set_fields.c
> >>> +++ b/debugfs/set_fields.c
> >>> @@ -144,6 +144,7 @@ static struct field_set_info super_fields[] = {
> >>> { "usr_quota_inum", &set_sb.s_usr_quota_inum, 4, parse_uint },
> >>> { "grp_quota_inum", &set_sb.s_grp_quota_inum, 4, parse_uint },
> >>> { "overhead_blocks", &set_sb.s_overhead_blocks, 4, parse_uint },
> >>> + { "checksum", &set_sb.s_checksum, 2, parse_uint },
> >>> { 0, 0, 0, 0 }
> >>> };
> >>>
> >>> @@ -179,6 +180,7 @@ static struct field_set_info inode_fields[] = {
> >>> { "fsize", &set_inode.osd2.hurd2.h_i_fsize, 1, parse_uint },
> >>> { "uid_high", &set_inode.osd2.linux2.l_i_uid_high, 2, parse_uint },
> >>> { "gid_high", &set_inode.osd2.linux2.l_i_gid_high, 2, parse_uint },
> >>> + { "checksum", &set_inode.osd2.linux2.l_i_checksum, 4, parse_uint },
> >>> { "author", &set_inode.osd2.hurd2.h_i_author, 4, parse_uint },
> >>> { "bmap", NULL, 4, parse_bmap, FLAG_ARRAY },
> >>> { 0, 0, 0, 0 }
> >>> @@ -192,7 +194,6 @@ static struct field_set_info ext2_bg_fields[] = {
> >>> { "free_inodes_count", &set_gd.bg_free_inodes_count, 2, parse_uint },
> >>> { "used_dirs_count", &set_gd.bg_used_dirs_count, 2, parse_uint },
> >>> { "flags", &set_gd.bg_flags, 2, parse_uint },
> >>> - { "reserved", &set_gd.bg_reserved, 2, parse_uint, FLAG_ARRAY, 2 },
> >>> { "itable_unused", &set_gd.bg_itable_unused, 2, parse_uint },
> >>> { "checksum", &set_gd.bg_checksum, 2, parse_gd_csum },
> >>> { 0, 0, 0, 0 }
> >>> diff --git a/lib/e2p/feature.c b/lib/e2p/feature.c
> >>> index 16fba53..965fc16 100644
> >>> --- a/lib/e2p/feature.c
> >>> +++ b/lib/e2p/feature.c
> >>> @@ -40,6 +40,8 @@ static struct feature feature_list[] = {
> >>> "resize_inode" },
> >>> { E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_LAZY_BG,
> >>> "lazy_bg" },
> >>> + { E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_EXCLUDE_BITMAP,
> >>> + "snapshot" },
> >>>
> >>> { E2P_FEATURE_RO_INCOMPAT, EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER,
> >>> "sparse_super" },
> >>> @@ -59,6 +61,8 @@ static struct feature feature_list[] = {
> >>> "quota" },
> >>> { E2P_FEATURE_RO_INCOMPAT, EXT4_FEATURE_RO_COMPAT_BIGALLOC,
> >>> "bigalloc"},
> >>> + { E2P_FEATURE_RO_INCOMPAT, EXT4_FEATURE_RO_COMPAT_METADATA_CSUM,
> >>> + "metadata_csum"},
> >>>
> >>> { E2P_FEATURE_INCOMPAT, EXT2_FEATURE_INCOMPAT_COMPRESSION,
> >>> "compression" },
> >>> diff --git a/lib/e2p/ls.c b/lib/e2p/ls.c
> >>> index 0f36f40..aaacdaa 100644
> >>> --- a/lib/e2p/ls.c
> >>> +++ b/lib/e2p/ls.c
> >>> @@ -413,6 +413,10 @@ void list_super2(struct ext2_super_block * sb, FILE *f)
> >>> if (sb->s_grp_quota_inum)
> >>> fprintf(f, "Group quota inode: %u\n",
> >>> sb->s_grp_quota_inum);
> >>> +
> >>> + if (sb->s_feature_ro_compat & EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)
> >>> + fprintf(f, "Checksum: 0x%08x\n",
> >>> + sb->s_checksum);
> >>> }
> >>>
> >>> void list_super (struct ext2_super_block * s)
> >>> diff --git a/lib/ext2fs/ext2_fs.h b/lib/ext2fs/ext2_fs.h
> >>> index 4fec5db..1b02054 100644
> >>> --- a/lib/ext2fs/ext2_fs.h
> >>> +++ b/lib/ext2fs/ext2_fs.h
> >>> @@ -142,7 +142,9 @@ struct ext2_group_desc
> >>> __u16 bg_free_inodes_count; /* Free inodes count */
> >>> __u16 bg_used_dirs_count; /* Directories count */
> >>> __u16 bg_flags;
> >>> - __u32 bg_reserved[2];
> >>> + __u32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */
> >>> + __u16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */
> >>> + __u16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */
> >>> __u16 bg_itable_unused; /* Unused inodes count */
> >>> __u16 bg_checksum; /* crc16(s_uuid+grouo_num+group_desc)*/
> >>> };
> >>> @@ -159,7 +161,9 @@ struct ext4_group_desc
> >>> __u16 bg_free_inodes_count; /* Free inodes count */
> >>> __u16 bg_used_dirs_count; /* Directories count */
> >>> __u16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
> >>> - __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */
> >>> + __u32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */
> >>> + __u16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */
> >>> + __u16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bitmap) LSB */
> >>> __u16 bg_itable_unused; /* Unused inodes count */
> >>> __u16 bg_checksum; /* crc16(sb_uuid+group+desc) */
> >>> __u32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
> >>> @@ -169,7 +173,10 @@ struct ext4_group_desc
> >>> __u16 bg_free_inodes_count_hi;/* Free inodes count MSB */
> >>> __u16 bg_used_dirs_count_hi; /* Directories count MSB */
> >>> __u16 bg_itable_unused_hi; /* Unused inodes count MSB */
> >>> - __u32 bg_reserved2[3];
> >>> + __u32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */
> >>> + __u16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bitmap) MSB */
> >>> + __u16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bitmap) MSB */
> >>> + __u32 bg_reserved;
> >>> };
> >>>
> >>> #define EXT2_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not initialized */
> >>> @@ -363,7 +370,7 @@ struct ext2_inode {
> >>> __u16 l_i_file_acl_high;
> >>> __u16 l_i_uid_high; /* these 2 fields */
> >>> __u16 l_i_gid_high; /* were reserved2[0] */
> >>> - __u32 l_i_reserved2;
> >>> + __u32 l_i_checksum; /* crc32c(uuid+inum+inode) */
> >>> } linux2;
> >>> struct {
> >>> __u8 h_i_frag; /* Fragment number */
> >>> @@ -410,7 +417,7 @@ struct ext2_inode_large {
> >>> __u16 l_i_file_acl_high;
> >>> __u16 l_i_uid_high; /* these 2 fields */
> >>> __u16 l_i_gid_high; /* were reserved2[0] */
> >>> - __u32 l_i_reserved2;
> >>> + __u32 l_i_checksum; /* crc32c(uuid+inum+inode) */
> >>> } linux2;
> >>> struct {
> >>> __u8 h_i_frag; /* Fragment number */
> >>> @@ -441,7 +448,7 @@ struct ext2_inode_large {
> >>> #define i_gid_low i_gid
> >>> #define i_uid_high osd2.linux2.l_i_uid_high
> >>> #define i_gid_high osd2.linux2.l_i_gid_high
> >>> -#define i_reserved2 osd2.linux2.l_i_reserved2
> >>> +#define i_checksum osd2.linux2.l_i_checksum
> >>> #else
> >>> #if defined(__GNU__)
> >>>
> >>> @@ -623,7 +630,8 @@ struct ext2_super_block {
> >>> __u32 s_usr_quota_inum; /* inode number of user quota file */
> >>> __u32 s_grp_quota_inum; /* inode number of group quota file */
> >>> __u32 s_overhead_blocks; /* overhead blocks/clusters in fs */
> >>> - __u32 s_reserved[109]; /* Padding to the end of the block */
> >>> + __u32 s_checksum; /* crc32c(superblock) */
> >>> + __u32 s_reserved[108]; /* Padding to the end of the block */
> >>> };
> >>>
> >>> #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
> >>> @@ -671,7 +679,9 @@ struct ext2_super_block {
> >>> #define EXT2_FEATURE_COMPAT_RESIZE_INODE 0x0010
> >>> #define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020
> >>> #define EXT2_FEATURE_COMPAT_LAZY_BG 0x0040
> >>> -#define EXT2_FEATURE_COMPAT_EXCLUDE_INODE 0x0080
> >>> +/* #define EXT2_FEATURE_COMPAT_EXCLUDE_INODE 0x0080 not used, legacy */
> >>> +#define EXT2_FEATURE_COMPAT_EXCLUDE_BITMAP 0x0100
> >>> +
> >>>
> >>> #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
> >>> #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
> >>> @@ -683,6 +693,7 @@ struct ext2_super_block {
> >>> #define EXT4_FEATURE_RO_COMPAT_HAS_SNAPSHOT 0x0080
> >>> #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
> >>> #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
> >>> +#define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
> >>>
> >>> #define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001
> >>> #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002
> >>> diff --git a/lib/ext2fs/swapfs.c b/lib/ext2fs/swapfs.c
> >>> index 87b1a2e..d1c4a56 100644
> >>> --- a/lib/ext2fs/swapfs.c
> >>> +++ b/lib/ext2fs/swapfs.c
> >>> @@ -78,6 +78,8 @@ void ext2fs_swap_super(struct ext2_super_block * sb)
> >>> sb->s_snapshot_list = ext2fs_swab32(sb->s_snapshot_list);
> >>> sb->s_usr_quota_inum = ext2fs_swab32(sb->s_usr_quota_inum);
> >>> sb->s_grp_quota_inum = ext2fs_swab32(sb->s_grp_quota_inum);
> >>> + sb->s_overhead_blocks = ext2fs_swab32(sb->s_overhead_blocks);
> >>> + sb->s_checksum = ext2fs_swab32(sb->s_checksum);
> >>>
> >>> for (i=0; i < 4; i++)
> >>> sb->s_hash_seed[i] = ext2fs_swab32(sb->s_hash_seed[i]);
> >>> @@ -106,6 +108,11 @@ void ext2fs_swap_group_desc2(ext2_filsys fs, struct ext2_group_desc *gdp)
> >>> gdp->bg_free_inodes_count = ext2fs_swab16(gdp->bg_free_inodes_count);
> >>> gdp->bg_used_dirs_count = ext2fs_swab16(gdp->bg_used_dirs_count);
> >>> gdp->bg_flags = ext2fs_swab16(gdp->bg_flags);
> >>> + gdp->bg_exclude_bitmap_lo = ext2fs_swab32(gdp->bg_exclude_bitmap_lo);
> >>> + gdp->bg_block_bitmap_csum_lo =
> >>> + ext2fs_swab16(gdp->bg_block_bitmap_csum_lo);
> >>> + gdp->bg_inode_bitmap_csum_lo =
> >>> + ext2fs_swab16(gdp->bg_inode_bitmap_csum_lo);
> >>> gdp->bg_itable_unused = ext2fs_swab16(gdp->bg_itable_unused);
> >>> gdp->bg_checksum = ext2fs_swab16(gdp->bg_checksum);
> >>> /* If we're 32-bit, we're done */
> >>> @@ -125,6 +132,11 @@ void ext2fs_swap_group_desc2(ext2_filsys fs, struct ext2_group_desc *gdp)
> >>> gdp4->bg_used_dirs_count_hi =
> >>> ext2fs_swab16(gdp4->bg_used_dirs_count_hi);
> >>> gdp4->bg_itable_unused_hi = ext2fs_swab16(gdp4->bg_itable_unused_hi);
> >>> + gdp->bg_exclude_bitmap_hi = ext2fs_swab16(gdp->bg_exclude_bitmap_hi);
> >>> + gdp->bg_block_bitmap_csum_hi =
> >>> + ext2fs_swab16(gdp->bg_block_bitmap_csum_hi);
> >>> + gdp->bg_inode_bitmap_csum_hi =
> >>> + ext2fs_swab16(gdp->bg_inode_bitmap_csum_hi);
> >>> }
> >>>
> >>> void ext2fs_swap_group_desc(struct ext2_group_desc *gdp)
> >>> @@ -244,8 +256,8 @@ void ext2fs_swap_inode_full(ext2_filsys fs, struct ext2_inode_large *t,
> >>> ext2fs_swab16 (f->osd2.linux2.l_i_uid_high);
> >>> t->osd2.linux2.l_i_gid_high =
> >>> ext2fs_swab16 (f->osd2.linux2.l_i_gid_high);
> >>> - t->osd2.linux2.l_i_reserved2 =
> >>> - ext2fs_swab32(f->osd2.linux2.l_i_reserved2);
> >>> + t->osd2.linux2.l_i_checksum =
> >>> + ext2fs_swab32(f->osd2.linux2.checksum);
> >>> break;
> >>> case EXT2_OS_HURD:
> >>> t->osd1.hurd1.h_i_translator =
> >>> diff --git a/lib/ext2fs/tst_inode_size.c b/lib/ext2fs/tst_inode_size.c
> >>> index 962f1cd..683b79c 100644
> >>> --- a/lib/ext2fs/tst_inode_size.c
> >>> +++ b/lib/ext2fs/tst_inode_size.c
> >>> @@ -61,7 +61,7 @@ void check_structure_fields()
> >>> check_field(osd2.linux2.l_i_file_acl_high);
> >>> check_field(osd2.linux2.l_i_uid_high);
> >>> check_field(osd2.linux2.l_i_gid_high);
> >>> - check_field(osd2.linux2.l_i_reserved2);
> >>> + check_field(osd2.linux2.l_i_checksum);
> >>> printf("Ending offset is %d\n\n", cur_offset);
> >>> #endif
> >>> }
> >>> diff --git a/lib/ext2fs/tst_super_size.c b/lib/ext2fs/tst_super_size.c
> >>> index 1e5a524..75659ae 100644
> >>> --- a/lib/ext2fs/tst_super_size.c
> >>> +++ b/lib/ext2fs/tst_super_size.c
> >>> @@ -126,6 +126,7 @@ void check_superblock_fields()
> >>> check_field(s_usr_quota_inum);
> >>> check_field(s_grp_quota_inum);
> >>> check_field(s_overhead_blocks);
> >>> + check_field(s_checksum);
> >>> check_field(s_reserved);
> >>> printf("Ending offset is %d\n\n", cur_offset);
> >>> #endif
> >>>
> >> --
> >> To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
> >> the body of a message to majordomo@...r.kernel.org
> >> More majordomo info at http://vger.kernel.org/majordomo-info.html
> >>
> > --
> > To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
> > the body of a message to majordomo@...r.kernel.org
> > More majordomo info at http://vger.kernel.org/majordomo-info.html
>
>
> Cheers, Andreas
>
>
>
>
>
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