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ocfs2: Add the on-disk structures for metadata checksums. 

Define struct ocfs2_block_check, an 8-byte structure containing a 32bit
crc32_le and a 16bit hamming code ecc.  This will be used for metadata
checksums.  Add the structure to free spaces in the various metadata
structures.

Add the OCFS2_FEATURE_INCOMPAT_META_ECC bit.

Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>
This commit is contained in:
Joel Becker 2008-10-16 17:50:30 -07:00 committed by Mark Fasheh
parent e06c8227fd
commit ab552d5467
1 changed files with 50 additions and 5 deletions
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55
fs/ocfs2/ocfs2_fs.h
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@ -149,6 +149,9 @@
/* Support for extended attributes */
#define OCFS2_FEATURE_INCOMPAT_XATTR 0x0200
/* Metadata checksum and error correction */
#define OCFS2_FEATURE_INCOMPAT_META_ECC 0x0800
/*
* backup superblock flag is used to indicate that this volume
* has backup superblocks.
@ -426,6 +429,22 @@ static unsigned char ocfs2_type_by_mode[S_IFMT >> S_SHIFT] = {
*/
#define OCFS2_RAW_SB(dinode) (&((dinode)->id2.i_super))
/*
* Block checking structure. This is used in metadata to validate the
* contents. If OCFS2_FEATURE_INCOMPAT_META_ECC is not set, it is all
* zeros.
*/
struct ocfs2_block_check {
/*00*/ __le32 bc_crc32e; /* 802.3 Ethernet II CRC32 */
__le16 bc_ecc; /* Single-error-correction parity vector.
This is a simple Hamming code dependant
on the blocksize. OCFS2's maximum
blocksize, 4K, requires 16 parity bits,
so we fit in __le16. */
__le16 bc_reserved1;
/*08*/
};
/*
* On disk extent record for OCFS2
* It describes a range of clusters on disk.
@ -513,7 +532,7 @@ struct ocfs2_truncate_log {
struct ocfs2_extent_block
{
/*00*/ __u8 h_signature[8]; /* Signature for verification */
__le64 h_reserved1;
struct ocfs2_block_check h_check; /* Error checking */
/*10*/ __le16 h_suballoc_slot; /* Slot suballocator this
extent_header belongs to */
__le16 h_suballoc_bit; /* Bit offset in suballocator
@ -683,7 +702,8 @@ struct ocfs2_dinode {
was set in i_flags */
__le16 i_dyn_features;
__le64 i_xattr_loc;
/*80*/ __le64 i_reserved2[7];
/*80*/ struct ocfs2_block_check i_check; /* Error checking */
/*88*/ __le64 i_reserved2[6];
/*B8*/ union {
__le64 i_pad1; /* Generic way to refer to this
64bit union */
@ -750,7 +770,8 @@ struct ocfs2_group_desc
/*20*/ __le64 bg_parent_dinode; /* dinode which owns me, in
blocks */
__le64 bg_blkno; /* Offset on disk, in blocks */
/*30*/ __le64 bg_reserved2[2];
/*30*/ struct ocfs2_block_check bg_check; /* Error checking */
__le64 bg_reserved2;
/*40*/ __u8 bg_bitmap[0];
};
@ -793,7 +814,12 @@ struct ocfs2_xattr_header {
in this extent record,
only valid in the first
bucket. */
__le64 xh_csum;
struct ocfs2_block_check xh_check; /* Error checking
(Note, this is only
used for xattr
buckets. A block uses
xb_check and sets
this field to zero.) */
struct ocfs2_xattr_entry xh_entries[0]; /* xattr entry list. */
};
@ -844,7 +870,7 @@ struct ocfs2_xattr_block {
block group */
__le32 xb_fs_generation; /* Must match super block */
/*10*/ __le64 xb_blkno; /* Offset on disk, in blocks */
__le64 xb_csum;
struct ocfs2_block_check xb_check; /* Error checking */
/*20*/ __le16 xb_flags; /* Indicates whether this block contains
real xattr or a xattr tree. */
__le16 xb_reserved0;
@ -988,6 +1014,25 @@ struct ocfs2_local_disk_dqblk {
/*10*/ __le64 dqb_inodemod; /* Change in the amount of used inodes */
};
/*
* The quota trailer lives at the end of each quota block.
*/
struct ocfs2_disk_dqtrailer {
/*00*/ struct ocfs2_block_check dq_check; /* Error checking */
/*08*/ /* Cannot be larger than OCFS2_QBLK_RESERVED_SPACE */
};
static inline struct ocfs2_disk_dqtrailer *ocfs2_block_dqtrailer(int blocksize,
void *buf)
{
char *ptr = buf;
ptr += blocksize - OCFS2_QBLK_RESERVED_SPACE;
return (struct ocfs2_disk_dqtrailer *)ptr;
}
#ifdef __KERNEL__
static inline int ocfs2_fast_symlink_chars(struct super_block *sb)
{