From mboxrd@z Thu Jan 1 00:00:00 1970 From: James Bottomley Subject: [PATCH 5/6] block: permit I/O to vmalloc/vmap kernel pages Date: Thu, 17 Sep 2009 18:07:00 -0500 Message-ID: <1253228821-4700-6-git-send-email-James.Bottomley@suse.de> References: <1253228821-4700-1-git-send-email-James.Bottomley@suse.de> <1253228821-4700-2-git-send-email-James.Bottomley@suse.de> <1253228821-4700-3-git-send-email-James.Bottomley@suse.de> <1253228821-4700-4-git-send-email-James.Bottomley@suse.de> <1253228821-4700-5-git-send-email-James.Bottomley@suse.de> Cc: Russell King , Christoph Hellwig , Paul Mundt , James Bottomley , James Bottomley To: linux-arch@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-parisc@vger.kernel.org Return-path: In-Reply-To: <1253228821-4700-5-git-send-email-James.Bottomley@suse.de> Sender: linux-parisc-owner@vger.kernel.org List-Id: linux-fsdevel.vger.kernel.org From: James Bottomley This updates bio_map_kern() to check for pages in the vmalloc address range and call the new kernel flushing APIs if the are. This should allow any kernel user to pass a vmalloc/vmap area to block. Signed-off-by: James Bottomley --- fs/bio.c | 20 ++++++++++++++++++-- 1 files changed, 18 insertions(+), 2 deletions(-) diff --git a/fs/bio.c b/fs/bio.c index 7673800..0cf7b79 100644 --- a/fs/bio.c +++ b/fs/bio.c @@ -1120,6 +1120,14 @@ void bio_unmap_user(struct bio *bio) static void bio_map_kern_endio(struct bio *bio, int err) { + void *kaddr = bio->bi_private; + + if (is_vmalloc_addr(kaddr)) { + int i; + + for (i = 0; i < bio->bi_vcnt; i++) + invalidate_kernel_dcache_addr(kaddr + i * PAGE_SIZE); + } bio_put(bio); } @@ -1138,9 +1146,12 @@ static struct bio *__bio_map_kern(struct request_queue *q, void *data, if (!bio) return ERR_PTR(-ENOMEM); + bio->bi_private = data; + offset = offset_in_page(kaddr); for (i = 0; i < nr_pages; i++) { unsigned int bytes = PAGE_SIZE - offset; + struct page *page; if (len <= 0) break; @@ -1148,8 +1159,13 @@ static struct bio *__bio_map_kern(struct request_queue *q, void *data, if (bytes > len) bytes = len; - if (bio_add_pc_page(q, bio, virt_to_page(data), bytes, - offset) < bytes) + if (is_vmalloc_addr(data)) { + flush_kernel_dcache_addr(data); + page = vmalloc_to_page(data); + } else + page = virt_to_page(data); + + if (bio_add_pc_page(q, bio, page, bytes, offset) < bytes) break; data += bytes; -- 1.6.3.3