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    SubjectRe: [PATCH 1/4] change buffer_head.b_size to size_t
    Badari Pulavarty <pbadari@us.ibm.com> wrote:
    >
    > + * Historically, a buffer_head was used to map a single block
    > + * within a page, and of course as the unit of I/O through the
    > + * filesystem and block layers. Nowadays the basic I/O unit
    > + * is the bio, and buffer_heads are used for extracting block
    > + * mappings (via a get_block_t call), for tracking state within
    > + * a page (via a page_mapping) and for wrapping bio submission
    > + * for backward compatibility reasons (e.g. submit_bh).

    Well kinda. A buffer_head remains the kernel's basic abstraction for a
    "disk block". We cannot replace that with `struct page' (size isn't
    flexible) nor of course with `struct bio'.

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