block: remove struct request buffer member

This was used in the olden days, back when onions were proper yellow. Basically it mapped to the current buffer to be transferred. With highmem being added more than a decade ago, most drivers map pages out of a bio, and rq->buffer isn't pointing at anything valid. Convert old style drivers to just use bio_data(). For the discard payload use case, just reference the page in the bio.

Jens Axboe committed 12 years ago

Commit b4f42e21 parent f89e0dd23 files · +55 −75Browse files

Showing the changes to include/linux/blkdev.h (1 of 23 files). Show all

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include/linux/blkdev.h+0−1

@@ -178,7 +178,6 @@ struct request { · 177 unmodified lines
178	unsigned short ioprio;	178	unsigned short ioprio;
179		179
180	void special; / opaque pointer available for LLD use */	180	void special; / opaque pointer available for LLD use */
181	char buffer; / kaddr of the current segment if available */
182		181
183	int tag;	182	int tag;
184	int errors;	183	int errors;