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Btrfs: add the tree history log to btrfs-progs 

This also adds btrfs-debug-tree -R to print the history

Signed-off-by: Chris Mason <chris.mason@oracle.com>
master
Chris Mason 2011-11-05 14:58:41 -04:00
parent 882895d411
commit 13eced9a0c
2 changed files with 139 additions and 1 deletions
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91
ctree.h
View File

@ -311,6 +311,47 @@ struct btrfs_header {
#define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
#define BTRFS_LABEL_SIZE 256
/*
* just in case we somehow lose the roots and are not able to mount,
* we store an array of the roots from previous transactions
* in the super.
*/
#define BTRFS_NUM_BACKUP_ROOTS 4
struct btrfs_root_backup {
__le64 tree_root;
__le64 tree_root_gen;
__le64 chunk_root;
__le64 chunk_root_gen;
__le64 extent_root;
__le64 extent_root_gen;
__le64 fs_root;
__le64 fs_root_gen;
__le64 dev_root;
__le64 dev_root_gen;
__le64 csum_root;
__le64 csum_root_gen;
__le64 total_bytes;
__le64 bytes_used;
__le64 num_devices;
/* future */
__le64 unsed_64[4];
u8 tree_root_level;
u8 chunk_root_level;
u8 extent_root_level;
u8 fs_root_level;
u8 dev_root_level;
u8 csum_root_level;
/* future and to align */
u8 unused_8[10];
} __attribute__ ((__packed__));
/*
* the super block basically lists the main trees of the FS
* it currently lacks any block count etc etc
@ -357,6 +398,7 @@ struct btrfs_super_block {
/* future expansion */
__le64 reserved[31];
u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS];
} __attribute__ ((__packed__));
/*
@ -1537,6 +1579,55 @@ BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
last_snapshot, 64);
/* struct btrfs_root_backup */
BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup,
tree_root, 64);
BTRFS_SETGET_STACK_FUNCS(backup_tree_root_gen, struct btrfs_root_backup,
tree_root_gen, 64);
BTRFS_SETGET_STACK_FUNCS(backup_tree_root_level, struct btrfs_root_backup,
tree_root_level, 8);
BTRFS_SETGET_STACK_FUNCS(backup_chunk_root, struct btrfs_root_backup,
chunk_root, 64);
BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_gen, struct btrfs_root_backup,
chunk_root_gen, 64);
BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_level, struct btrfs_root_backup,
chunk_root_level, 8);
BTRFS_SETGET_STACK_FUNCS(backup_extent_root, struct btrfs_root_backup,
extent_root, 64);
BTRFS_SETGET_STACK_FUNCS(backup_extent_root_gen, struct btrfs_root_backup,
extent_root_gen, 64);
BTRFS_SETGET_STACK_FUNCS(backup_extent_root_level, struct btrfs_root_backup,
extent_root_level, 8);
BTRFS_SETGET_STACK_FUNCS(backup_fs_root, struct btrfs_root_backup,
fs_root, 64);
BTRFS_SETGET_STACK_FUNCS(backup_fs_root_gen, struct btrfs_root_backup,
fs_root_gen, 64);
BTRFS_SETGET_STACK_FUNCS(backup_fs_root_level, struct btrfs_root_backup,
fs_root_level, 8);
BTRFS_SETGET_STACK_FUNCS(backup_dev_root, struct btrfs_root_backup,
dev_root, 64);
BTRFS_SETGET_STACK_FUNCS(backup_dev_root_gen, struct btrfs_root_backup,
dev_root_gen, 64);
BTRFS_SETGET_STACK_FUNCS(backup_dev_root_level, struct btrfs_root_backup,
dev_root_level, 8);
BTRFS_SETGET_STACK_FUNCS(backup_csum_root, struct btrfs_root_backup,
csum_root, 64);
BTRFS_SETGET_STACK_FUNCS(backup_csum_root_gen, struct btrfs_root_backup,
csum_root_gen, 64);
BTRFS_SETGET_STACK_FUNCS(backup_csum_root_level, struct btrfs_root_backup,
csum_root_level, 8);
BTRFS_SETGET_STACK_FUNCS(backup_total_bytes, struct btrfs_root_backup,
total_bytes, 64);
BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup,
bytes_used, 64);
BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup,
num_devices, 64);
/* struct btrfs_super_block */
BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);

49
debug-tree.c
View File

@ -62,6 +62,45 @@ static void print_extents(struct btrfs_root *root, struct extent_buffer *eb)
}
}
static void print_old_roots(struct btrfs_super_block *super)
{
struct btrfs_root_backup *backup;
int i;
for (i = 0; i < BTRFS_NUM_BACKUP_ROOTS; i++) {
backup = super->super_roots + i;
printf("btrfs root backup slot %d\n", i);
printf("\ttree root gen %llu block %llu\n",
(unsigned long long)btrfs_backup_tree_root_gen(backup),
(unsigned long long)btrfs_backup_tree_root(backup));
printf("\t\textent root gen %llu block %llu\n",
(unsigned long long)btrfs_backup_extent_root_gen(backup),
(unsigned long long)btrfs_backup_extent_root(backup));
printf("\t\tchunk root gen %llu block %llu\n",
(unsigned long long)btrfs_backup_chunk_root_gen(backup),
(unsigned long long)btrfs_backup_chunk_root(backup));
printf("\t\tdevice root gen %llu block %llu\n",
(unsigned long long)btrfs_backup_dev_root_gen(backup),
(unsigned long long)btrfs_backup_dev_root(backup));
printf("\t\tcsum root gen %llu block %llu\n",
(unsigned long long)btrfs_backup_csum_root_gen(backup),
(unsigned long long)btrfs_backup_csum_root(backup));
printf("\t\tfs root gen %llu block %llu\n",
(unsigned long long)btrfs_backup_fs_root_gen(backup),
(unsigned long long)btrfs_backup_fs_root(backup));
printf("\t\t%llu used %llu total %llu devices\n",
(unsigned long long)btrfs_backup_bytes_used(backup),
(unsigned long long)btrfs_backup_total_bytes(backup),
(unsigned long long)btrfs_backup_num_devices(backup));
}
}
int main(int ac, char **av)
{
struct btrfs_root *root;
@ -77,6 +116,7 @@ int main(int ac, char **av)
int extent_only = 0;
int device_only = 0;
int roots_only = 0;
int root_backups = 0;
u64 block_only = 0;
struct btrfs_root *tree_root_scan;
@ -84,7 +124,7 @@ int main(int ac, char **av)
while(1) {
int c;
c = getopt(ac, av, "deb:r");
c = getopt(ac, av, "deb:rR");
if (c < 0)
break;
switch(c) {
@ -97,6 +137,10 @@ int main(int ac, char **av)
case 'r':
roots_only = 1;
break;
case 'R':
roots_only = 1;
root_backups = 1;
break;
case 'b':
block_only = atoll(optarg);
break;
@ -289,6 +333,9 @@ again:
if (extent_only || device_only)
return 0;
if (root_backups)
print_old_roots(&root->fs_info->super_copy);
printf("total bytes %llu\n",
(unsigned long long)btrfs_super_total_bytes(&root->fs_info->super_copy));
printf("bytes used %llu\n",