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authorChristoph Hellwig <hch@infradead.org>2009-09-30 13:52:12 +0200
committerJens Axboe <jens.axboe@oracle.com>2009-10-01 21:15:46 +0200
commit1122a26f2abe4245ccdaed95ec23f63fe086b332 (patch)
treead06f119f283cf8a6313681055e8132ba2851ddb /fs/mpage.c
parent3bd0f0c763e497c8674b28e3df2732f48683dabd (diff)
downloadlinux-1122a26f2abe4245ccdaed95ec23f63fe086b332.tar.bz2
block: use normal I/O path for discard requests
prepare_discard_fn() was being called in a place where memory allocation was effectively impossible. This makes it inappropriate for all but the most trivial translations of Linux's DISCARD operation to the block command set. Additionally adding a payload there makes the ownership of the bio backing unclear as it's now allocated by the device driver and not the submitter as usual. It is replaced with QUEUE_FLAG_DISCARD which is used to indicate whether the queue supports discard operations or not. blkdev_issue_discard now allocates a one-page, sector-length payload which is the right thing for the common ATA and SCSI implementations. The mtd implementation of prepare_discard_fn() is replaced with simply checking for the request being a discard. Largely based on a previous patch from Matthew Wilcox <matthew@wil.cx> which did the prepare_discard_fn but not the different payload allocation yet. Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'fs/mpage.c')
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