Module inline_data 

Inline data reading.

Spec: kernel.org/doc/html/latest/filesystems/ext4/inlinedata.html

When the INCOMPAT_INLINE_DATA feature is enabled and an inode has the EXT4_INLINE_DATA_FL flag, the file’s contents live inside the inode itself instead of being stored in extent-allocated data blocks.

Layout:

• First 60 bytes of the file are stored in the i_block[60] array (the same field that normally holds the extent header / direct block pointers).
• If the file is larger than 60 bytes, the remainder is stored as the value of a special xattr named system.data. Concatenate the two to get the full file content.
• Maximum inline file size = 60 + (in-inode-xattr-region-size minus headers and other entries). Typically 60–~150 bytes for inode_size=256.

Functions

read_all

Read the contents of an inline-data file in full.

read_range

Read a range from an inline-data file. Returns the bytes copied into dst, or Ok(0) if offset >= size.