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| author | Luke Shumaker <lukeshu@lukeshu.com> | 2022-10-17 00:15:06 -0600 |
|---|---|---|
| committer | Luke Shumaker <lukeshu@lukeshu.com> | 2022-12-20 19:58:11 -0700 |
| commit | 53a2ce3b4dcbfd17ac15230da17130a2aeae42dc (patch) | |
| tree | 4d915a8ae475b82f53014b2c8c90a31932794168 /lib/btrfs/btrfsitem/item_rootref.go | |
| parent | 85169c799b4a0d4ba7d39347c07690dc0b49a1d1 (diff) | |
Add and improve comments
Diffstat (limited to 'lib/btrfs/btrfsitem/item_rootref.go')
| -rw-r--r-- | lib/btrfs/btrfsitem/item_rootref.go | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/lib/btrfs/btrfsitem/item_rootref.go b/lib/btrfs/btrfsitem/item_rootref.go index d1dfd3b..b33883d 100644 --- a/lib/btrfs/btrfsitem/item_rootref.go +++ b/lib/btrfs/btrfsitem/item_rootref.go @@ -12,9 +12,16 @@ import ( "git.lukeshu.com/btrfs-progs-ng/lib/btrfs/btrfsprim" ) +// RootRefs link subvolumes parent→child for normal subvolumes and +// base→snapshot for snapshot subvolumes. BACKREF items go the other +// direction; child→parent and snapshot→base. +// +// ROOT_REF | ROOT_BACKREF +// key.objectid = ID of the parent subvolume | ID of the child subvolume +// key.offset = ID of the child subvolume | ID of the parent subvolume type RootRef struct { // ROOT_REF=156 ROOT_BACKREF=144 - DirID btrfsprim.ObjID `bin:"off=0x00, siz=0x8"` - Sequence int64 `bin:"off=0x08, siz=0x8"` + DirID btrfsprim.ObjID `bin:"off=0x00, siz=0x8"` // inode of the parent directory of the dir entry + Sequence int64 `bin:"off=0x08, siz=0x8"` // index of that dir entry within the parent NameLen uint16 `bin:"off=0x10, siz=0x2"` // [ignored-when-writing] binstruct.End `bin:"off=0x12"` Name []byte `bin:"-"` |