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Add disk format elements for compression

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2008-10-29 14:37:41 -04:00
parent b431f25ec7
commit c830821ddf
2 changed files with 58 additions and 8 deletions
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51
ctree.h
View File

@ -377,10 +377,18 @@ struct btrfs_timespec {
__le32 nsec;
} __attribute__ ((__packed__));
/*
* there is no padding here on purpose. If you want to extent the inode,
* make a new item type
*/
typedef enum {
BTRFS_COMPRESS_NONE = 0,
BTRFS_COMPRESS_ZLIB = 1,
BTRFS_COMPRESS_LAST = 2,
} btrfs_compression_type;
/* we don't understand any encryption methods right now */
typedef enum {
BTRFS_ENCRYPTION_NONE = 0,
BTRFS_ENCRYPTION_LAST = 1,
} btrfs_encryption_type;
struct btrfs_inode_item {
/* nfs style generation number */
__le64 generation;
@ -396,6 +404,7 @@ struct btrfs_inode_item {
__le64 rdev;
__le16 flags;
__le16 compat_flags;
struct btrfs_timespec atime;
struct btrfs_timespec ctime;
struct btrfs_timespec mtime;
@ -427,8 +436,33 @@ struct btrfs_root_item {
#define BTRFS_FILE_EXTENT_INLINE 1
struct btrfs_file_extent_item {
/*
* transaction id that created this extent
*/
__le64 generation;
/*
* max number of bytes to hold this extent in ram
* when we split a compressed extent we can't know how big
* each of the resulting pieces will be. So, this is
* an upper limit on the size of the extent in ram instead of
* an exact limit.
*/
__le64 ram_bytes;
/*
* 32 bits for the various ways we might encode the data,
* including compression and encryption. If any of these
* are set to something a given disk format doesn't understand
* it is treated like an incompat flag for reading and writing,
* but not for stat.
*/
u8 compression;
u8 encryption;
__le16 other_encoding; /* spare for later use */
/* are we inline data or a real extent? */
u8 type;
/*
* disk space consumed by the extent, checksum blocks are included
* in these numbers
@ -447,6 +481,7 @@ struct btrfs_file_extent_item {
* the logical number of file blocks (no csums included)
*/
__le64 num_bytes;
} __attribute__ ((__packed__));
struct btrfs_csum_item {
@ -1284,6 +1319,14 @@ BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
offset, 64);
BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
num_bytes, 64);
BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
ram_bytes, 64);
BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
compression, 8);
BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
encryption, 8);
BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
other_encoding, 16);
static inline u32 btrfs_level_size(struct btrfs_root *root, int level) {
if (level == 0)

15
print-tree.c
View File

@ -228,16 +228,23 @@ void btrfs_print_leaf(struct btrfs_root *root, struct extent_buffer *l)
struct btrfs_file_extent_item);
if (btrfs_file_extent_type(l, fi) ==
BTRFS_FILE_EXTENT_INLINE) {
printf("\t\tinline extent data size %u\n",
btrfs_file_extent_inline_len(l, item));
printf("\t\tinline extent data size %u "
"ram %llu compress %d\n",
btrfs_file_extent_inline_len(l, item),
(unsigned long long)
btrfs_file_extent_ram_bytes(l, fi),
btrfs_file_extent_compression(l, fi));
break;
}
printf("\t\textent data disk byte %llu nr %llu\n",
(unsigned long long)btrfs_file_extent_disk_bytenr(l, fi),
(unsigned long long)btrfs_file_extent_disk_num_bytes(l, fi));
printf("\t\textent data offset %llu nr %llu\n",
printf("\t\textent data offset %llu nr %llu ram %llu\n",
(unsigned long long)btrfs_file_extent_offset(l, fi),
(unsigned long long)btrfs_file_extent_num_bytes(l, fi));
(unsigned long long)btrfs_file_extent_num_bytes(l, fi),
(unsigned long long)btrfs_file_extent_ram_bytes(l, fi));
printf("\t\textent compression %d\n",
btrfs_file_extent_compression(l, fi));
break;
case BTRFS_BLOCK_GROUP_ITEM_KEY:
bi = btrfs_item_ptr(l, i,