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Add support for printing block map items

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Signed-off-by: Zach Brown <zab@versity.com>
This commit is contained in:
Zach Brown
2016-08-05 14:53:42 -07:00
parent 25e3b03d94
commit be4a137479
2 changed files with 33 additions and 1 deletions
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20
utils/src/format.h
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@@ -100,7 +100,7 @@ struct scoutfs_key {
#define SCOUTFS_INODE_KEY 1
#define SCOUTFS_XATTR_KEY 2
#define SCOUTFS_DIRENT_KEY 3
#define SCOUTFS_DATA_KEY 4
#define SCOUTFS_BMAP_KEY 4
#define SCOUTFS_MAX_ITEM_LEN 512
@@ -244,4 +244,22 @@ struct scoutfs_xattr {
__u8 name[0];
} __packed;
/*
* We use simple block map items to map a aligned fixed group of logical
* block offsets to physical blocks. We make them a decent size to
* reduce the item storage overhead per block referenced, but we don't
* want them so large that they start to take up an extraordinary amount
* of space for small files. 8 block items ranges from around 3% to .3%
* overhead for files that use only one or all of the blocks in the
* mapping item.
*/
#define SCOUTFS_BLOCK_MAP_SHIFT 3
#define SCOUTFS_BLOCK_MAP_COUNT (1 << SCOUTFS_BLOCK_MAP_SHIFT)
#define SCOUTFS_BLOCK_MAP_MASK (SCOUTFS_BLOCK_MAP_COUNT - 1)
struct scoutfs_block_map {
__le32 crc[SCOUTFS_BLOCK_MAP_COUNT];
__le64 blkno[SCOUTFS_BLOCK_MAP_COUNT];
};
#endif

14
utils/src/print.c
View File

@@ -89,6 +89,17 @@ static void print_dirent(struct scoutfs_dirent *dent, unsigned int val_len)
le64_to_cpu(dent->ino), dent->type, i, name);
}
static void print_block_map(struct scoutfs_block_map *map)
{
int i;
printf(" bmap:");
for (i = 0; i < SCOUTFS_BLOCK_MAP_COUNT; i++)
printf(" [%u] %llu",
i, le64_to_cpu(map->blkno[i]));
printf("\n");
}
static void print_block_ref(struct scoutfs_block_ref *ref)
{
printf(" ref: blkno %llu seq %llu\n",
@@ -110,6 +121,9 @@ static void print_btree_val(struct scoutfs_btree_item *item, u8 level)
case SCOUTFS_DIRENT_KEY:
print_dirent((void *)item->val, le16_to_cpu(item->val_len));
break;
case SCOUTFS_BMAP_KEY:
print_block_map((void *)item->val);
break;
}
}