Module superblock 

Superblock: reading and parsing the btrfs superblock from a block device

The superblock is a 4096-byte structure stored at a fixed offset on disk (primary at 64 KiB, with mirrors at 64 MiB and 256 GiB). It contains the root pointers and metadata needed to bootstrap access to the rest of the filesystem.

Structs

BackupRoot

A single backup root entry.

DevItem

Embedded device information from the superblock.

Superblock

Parsed btrfs superblock.

Enums

CsumType

Checksum algorithm used by the filesystem.

Constants

SUPER_MIRROR_MAX

Maximum number of superblock mirrors (3: primary + 2 copies). From kernel-shared/disk-io.h: BTRFS_SUPER_MIRROR_MAX

Functions

print_superblock

Print the superblock in the same format as btrfs inspect-internal dump-super.

read_superblock

Read and parse a btrfs superblock from a reader at the given mirror index (0, 1, or 2).

super_mirror_offset

Compute the byte offset of the superblock mirror at index.