diff options
author | Ilya Loginov <isloginov@gmail.com> | 2009-11-26 09:16:19 +0100 |
---|---|---|
committer | Jens Axboe <jens.axboe@oracle.com> | 2009-11-26 09:16:19 +0100 |
commit | 2d4dc890b5c8fabd818a8586607e6843c4375e62 (patch) | |
tree | 9976ed7b0eed0056f8289aeb6a2b0abf8c940454 /fs/bio.c | |
parent | 3586e917f2c7df769d173c4ec99554cb40a911e5 (diff) | |
download | linux-2d4dc890b5c8fabd818a8586607e6843c4375e62.tar.gz |
block: add helpers to run flush_dcache_page() against a bio and a request's pages
Mtdblock driver doesn't call flush_dcache_page for pages in request. So, this causes problems on architectures where the icache doesn't fill from the dcache or with dcache aliases. The patch fixes this. The ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE symbol was introduced to avoid pointless empty cache-thrashing loops on architectures for which flush_dcache_page() is a no-op. Every architecture was provided with this flush pages on architectires where ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE is equal 1 or do nothing otherwise. See "fix mtd_blkdevs problem with caches on some architectures" discussion on LKML for more information. Signed-off-by: Ilya Loginov <isloginov@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Peter Horton <phorton@bitbox.co.uk> Cc: "Ed L. Cashin" <ecashin@coraid.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'fs/bio.c')
-rw-r--r-- | fs/bio.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/fs/bio.c b/fs/bio.c index 12da5db8682c..e23a63f4f7de 100644 --- a/fs/bio.c +++ b/fs/bio.c @@ -1393,6 +1393,18 @@ void bio_check_pages_dirty(struct bio *bio) } } +#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE +void bio_flush_dcache_pages(struct bio *bi) +{ + int i; + struct bio_vec *bvec; + + bio_for_each_segment(bvec, bi, i) + flush_dcache_page(bvec->bv_page); +} +EXPORT_SYMBOL(bio_flush_dcache_pages); +#endif + /** * bio_endio - end I/O on a bio * @bio: bio |