diff options
Diffstat (limited to 'lib/btrfs/btrfsitem/item_extent.go')
| -rw-r--r-- | lib/btrfs/btrfsitem/item_extent.go | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/lib/btrfs/btrfsitem/item_extent.go b/lib/btrfs/btrfsitem/item_extent.go index 871ed90..edfef7c 100644 --- a/lib/btrfs/btrfsitem/item_extent.go +++ b/lib/btrfs/btrfsitem/item_extent.go @@ -13,8 +13,22 @@ import ( "git.lukeshu.com/btrfs-progs-ng/lib/fmtutil" ) -// key.objectid = laddr of the extent -// key.offset = length of the extent +// Extent items map from regions in the logical address space to +// regions in a file. +// +// Compare with: +// +// - Metadata, which are like Extents but without .Info. +// - FileExtents, which map from regions in a file to regions in the +// logical address space. +// +// An Extent may contain (inline or not) several ExtentDataRef items +// and/or ShareDataRef items. +// +// Key: +// +// key.objectid = laddr of the extent +// key.offset = length of the extent type Extent struct { // complex EXTENT_ITEM=168 Head ExtentHeader Info TreeBlockInfo // only if .Head.Flags.Has(EXTENT_FLAG_TREE_BLOCK) |