Struct XattrState 

pub struct XattrState { /* private fields */ }

Tracks which extended attributes go inline (in the inode’s extra space) versus in a separate xattr block.

Implementations

impl XattrState

pub fn new(inode: u32, inode_capacity: u32, block_capacity: u32) -> Self

Create a new xattr state tracker for the given inode.

pub fn add(&mut self, attr: ExtendedAttribute) -> Result<(), FormatError>

Add an attribute. It is placed inline if there is room; otherwise it goes into the block area. Returns an error if neither has enough space.

pub fn has_inline(&self) -> bool

Whether any inline xattrs have been recorded.

pub fn has_block(&self) -> bool

Whether any block xattrs have been recorded.

pub fn write_inline(&self) -> Result<Vec<u8>, FormatError>

Serialize the inline xattrs into a buffer suitable for the inode’s inline xattr area.

The returned buffer is exactly inode_capacity bytes. Layout:

• 4-byte magic (XATTR_HEADER_MAGIC)
• Entries packed from the front (header + name + padding)
• Values packed from the back (aligned to 4 bytes)

pub fn write_block(&self) -> Result<Vec<u8>, FormatError>

Serialize the block xattrs into a full block-sized buffer.

Layout:

• 32-byte header (magic + refcount=1 + blocks=1 + 20 zero bytes)
• Entries sorted by (index, name_len, name), packed from the front
• Values packed from the back