Messages in this thread | | | Date | Wed, 1 Mar 2006 17:51:48 -0800 | From | Andrew Morton <> | Subject | Re: [PATCH 1/4] change buffer_head.b_size to size_t |
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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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