lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

Btrfs: verify csums on read

Browse Source 
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2007-03-29 15:15:27 -04:00
committed by David Woodhouse
parent 75dfe3960e
commit f254e52c1c
6 changed files with 279 additions and 60 deletions
Download Patch File Download Diff File Expand all files Collapse all files

47
fs/btrfs/ctree.h
View File

@ -21,6 +21,9 @@ struct btrfs_transaction;
*/
#define BTRFS_NAME_LEN 255
/* 32 bytes in various csum fields */
#define BTRFS_CSUM_SIZE 32
/*
* the key defines the order in the tree, and so it also defines (optimal)
* block layout. objectid corresonds to the inode number. The flags
@ -37,21 +40,21 @@ struct btrfs_transaction;
*/
struct btrfs_disk_key {
__le64 objectid;
__le32 flags;
__le64 offset;
__le32 flags;
} __attribute__ ((__packed__));
struct btrfs_key {
u64 objectid;
u32 flags;
u64 offset;
u32 flags;
} __attribute__ ((__packed__));
/*
* every tree block (leaf or node) starts with this header.
*/
struct btrfs_header {
__le32 csum[8];
u8 csum[BTRFS_CSUM_SIZE];
u8 fsid[16]; /* FS specific uuid */
__le64 blocknr; /* which block this node is supposed to live in */
__le64 generation;
@ -75,7 +78,7 @@ struct buffer_head;
* it currently lacks any block count etc etc
*/
struct btrfs_super_block {
__le32 csum[8];
u8 csum[BTRFS_CSUM_SIZE];
/* the first 3 fields must match struct btrfs_header */
u8 fsid[16]; /* FS specific uuid */
__le64 blocknr; /* this block number */
@ -147,7 +150,7 @@ struct btrfs_extent_item {
} __attribute__ ((__packed__));
struct btrfs_inode_timespec {
__le32 sec;
__le64 sec;
__le32 nsec;
} __attribute__ ((__packed__));
@ -214,6 +217,10 @@ struct btrfs_file_extent_item {
__le64 num_blocks;
} __attribute__ ((__packed__));
struct btrfs_csum_item {
u8 csum[BTRFS_CSUM_SIZE];
} __attribute__ ((__packed__));
struct btrfs_inode_map_item {
struct btrfs_disk_key key;
} __attribute__ ((__packed__));
@ -283,27 +290,32 @@ struct btrfs_root {
* a (hopefully) huge chunk of disk
*/
#define BTRFS_EXTENT_DATA_KEY 4
/*
* csum items have the checksums for data in the extents
*/
#define BTRFS_CSUM_ITEM_KEY 5
/*
* root items point to tree roots. There are typically in the root
* tree used by the super block to find all the other trees
*/
#define BTRFS_ROOT_ITEM_KEY 5
#define BTRFS_ROOT_ITEM_KEY 6
/*
* extent items are in the extent map tree. These record which blocks
* are used, and how many references there are to each block
*/
#define BTRFS_EXTENT_ITEM_KEY 6
#define BTRFS_EXTENT_ITEM_KEY 7
/*
* the inode map records which inode numbers are in use and where
* they actually live on disk
*/
#define BTRFS_INODE_MAP_ITEM_KEY 7
#define BTRFS_INODE_MAP_ITEM_KEY 8
/*
* string items are for debugging. They just store a short string of
* data in the FS
*/
#define BTRFS_STRING_ITEM_KEY 8
#define BTRFS_STRING_ITEM_KEY 9
static inline u64 btrfs_inode_generation(struct btrfs_inode_item *i)
{
@ -407,15 +419,15 @@ static inline void btrfs_set_inode_compat_flags(struct btrfs_inode_item *i,
i->compat_flags = cpu_to_le16(val);
}
static inline u32 btrfs_timespec_sec(struct btrfs_inode_timespec *ts)
static inline u64 btrfs_timespec_sec(struct btrfs_inode_timespec *ts)
{
return le32_to_cpu(ts->sec);
return le64_to_cpu(ts->sec);
}
static inline void btrfs_set_timespec_sec(struct btrfs_inode_timespec *ts,
u32 val)
u64 val)
{
ts->sec = cpu_to_le32(val);
ts->sec = cpu_to_le64(val);
}
static inline u32 btrfs_timespec_nsec(struct btrfs_inode_timespec *ts)
@ -429,8 +441,6 @@ static inline void btrfs_set_timespec_nsec(struct btrfs_inode_timespec *ts,
ts->nsec = cpu_to_le32(val);
}
static inline u64 btrfs_extent_owner(struct btrfs_extent_item *ei)
{
return le64_to_cpu(ei->owner);
@ -905,4 +915,11 @@ int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_path *path, u64 objectid,
u64 blocknr, int mod);
int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u64 objectid, u64 offset,
char *data, size_t len);
int btrfs_csum_verify_file_block(struct btrfs_root *root,
u64 objectid, u64 offset,
char *data, size_t len);
#endif